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Diffstat (limited to 'src/3rdparty/v8/src/ia32/codegen-ia32.cc')
| -rw-r--r-- | src/3rdparty/v8/src/ia32/codegen-ia32.cc | 10385 |
1 files changed, 10385 insertions, 0 deletions
diff --git a/src/3rdparty/v8/src/ia32/codegen-ia32.cc b/src/3rdparty/v8/src/ia32/codegen-ia32.cc new file mode 100644 index 0000000..8a47e72 --- /dev/null +++ b/src/3rdparty/v8/src/ia32/codegen-ia32.cc @@ -0,0 +1,10385 @@ +// Copyright 2010 the V8 project authors. All rights reserved. +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following +// disclaimer in the documentation and/or other materials provided +// with the distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived +// from this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#include "v8.h" + +#if defined(V8_TARGET_ARCH_IA32) + +#include "codegen-inl.h" +#include "bootstrapper.h" +#include "code-stubs.h" +#include "compiler.h" +#include "debug.h" +#include "ic-inl.h" +#include "parser.h" +#include "regexp-macro-assembler.h" +#include "register-allocator-inl.h" +#include "scopes.h" +#include "virtual-frame-inl.h" + +namespace v8 { +namespace internal { + +#define __ ACCESS_MASM(masm) + +// ------------------------------------------------------------------------- +// Platform-specific FrameRegisterState functions. + +void FrameRegisterState::Save(MacroAssembler* masm) const { + for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) { + int action = registers_[i]; + if (action == kPush) { + __ push(RegisterAllocator::ToRegister(i)); + } else if (action != kIgnore && (action & kSyncedFlag) == 0) { + __ mov(Operand(ebp, action), RegisterAllocator::ToRegister(i)); + } + } +} + + +void FrameRegisterState::Restore(MacroAssembler* masm) const { + // Restore registers in reverse order due to the stack. + for (int i = RegisterAllocator::kNumRegisters - 1; i >= 0; i--) { + int action = registers_[i]; + if (action == kPush) { + __ pop(RegisterAllocator::ToRegister(i)); + } else if (action != kIgnore) { + action &= ~kSyncedFlag; + __ mov(RegisterAllocator::ToRegister(i), Operand(ebp, action)); + } + } +} + + +#undef __ +#define __ ACCESS_MASM(masm_) + +// ------------------------------------------------------------------------- +// Platform-specific DeferredCode functions. + +void DeferredCode::SaveRegisters() { + frame_state_.Save(masm_); +} + + +void DeferredCode::RestoreRegisters() { + frame_state_.Restore(masm_); +} + + +// ------------------------------------------------------------------------- +// Platform-specific RuntimeCallHelper functions. + +void VirtualFrameRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const { + frame_state_->Save(masm); +} + + +void VirtualFrameRuntimeCallHelper::AfterCall(MacroAssembler* masm) const { + frame_state_->Restore(masm); +} + + +void StubRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const { + masm->EnterInternalFrame(); +} + + +void StubRuntimeCallHelper::AfterCall(MacroAssembler* masm) const { + masm->LeaveInternalFrame(); +} + + +// ------------------------------------------------------------------------- +// CodeGenState implementation. + +CodeGenState::CodeGenState(CodeGenerator* owner) + : owner_(owner), + destination_(NULL), + previous_(NULL) { + owner_->set_state(this); +} + + +CodeGenState::CodeGenState(CodeGenerator* owner, + ControlDestination* destination) + : owner_(owner), + destination_(destination), + previous_(owner->state()) { + owner_->set_state(this); +} + + +CodeGenState::~CodeGenState() { + ASSERT(owner_->state() == this); + owner_->set_state(previous_); +} + +// ------------------------------------------------------------------------- +// CodeGenerator implementation. + +CodeGenerator::CodeGenerator(MacroAssembler* masm) + : deferred_(8), + masm_(masm), + info_(NULL), + frame_(NULL), + allocator_(NULL), + state_(NULL), + loop_nesting_(0), + in_safe_int32_mode_(false), + safe_int32_mode_enabled_(true), + function_return_is_shadowed_(false), + in_spilled_code_(false), + jit_cookie_((FLAG_mask_constants_with_cookie) ? + V8::RandomPrivate(Isolate::Current()) : 0) { +} + + +// Calling conventions: +// ebp: caller's frame pointer +// esp: stack pointer +// edi: called JS function +// esi: callee's context + +void CodeGenerator::Generate(CompilationInfo* info) { + // Record the position for debugging purposes. + CodeForFunctionPosition(info->function()); + Comment cmnt(masm_, "[ function compiled by virtual frame code generator"); + + // Initialize state. + info_ = info; + ASSERT(allocator_ == NULL); + RegisterAllocator register_allocator(this); + allocator_ = ®ister_allocator; + ASSERT(frame_ == NULL); + frame_ = new VirtualFrame(); + set_in_spilled_code(false); + + // Adjust for function-level loop nesting. + ASSERT_EQ(0, loop_nesting_); + loop_nesting_ = info->is_in_loop() ? 1 : 0; + + masm()->isolate()->set_jump_target_compiling_deferred_code(false); + + { + CodeGenState state(this); + + // Entry: + // Stack: receiver, arguments, return address. + // ebp: caller's frame pointer + // esp: stack pointer + // edi: called JS function + // esi: callee's context + allocator_->Initialize(); + +#ifdef DEBUG + if (strlen(FLAG_stop_at) > 0 && + info->function()->name()->IsEqualTo(CStrVector(FLAG_stop_at))) { + frame_->SpillAll(); + __ int3(); + } +#endif + + frame_->Enter(); + + // Allocate space for locals and initialize them. + frame_->AllocateStackSlots(); + + // Allocate the local context if needed. + int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS; + if (heap_slots > 0) { + Comment cmnt(masm_, "[ allocate local context"); + // Allocate local context. + // Get outer context and create a new context based on it. + frame_->PushFunction(); + Result context; + if (heap_slots <= FastNewContextStub::kMaximumSlots) { + FastNewContextStub stub(heap_slots); + context = frame_->CallStub(&stub, 1); + } else { + context = frame_->CallRuntime(Runtime::kNewContext, 1); + } + + // Update context local. + frame_->SaveContextRegister(); + + // Verify that the runtime call result and esi agree. + if (FLAG_debug_code) { + __ cmp(context.reg(), Operand(esi)); + __ Assert(equal, "Runtime::NewContext should end up in esi"); + } + } + + // TODO(1241774): Improve this code: + // 1) only needed if we have a context + // 2) no need to recompute context ptr every single time + // 3) don't copy parameter operand code from SlotOperand! + { + Comment cmnt2(masm_, "[ copy context parameters into .context"); + // Note that iteration order is relevant here! If we have the same + // parameter twice (e.g., function (x, y, x)), and that parameter + // needs to be copied into the context, it must be the last argument + // passed to the parameter that needs to be copied. This is a rare + // case so we don't check for it, instead we rely on the copying + // order: such a parameter is copied repeatedly into the same + // context location and thus the last value is what is seen inside + // the function. + for (int i = 0; i < scope()->num_parameters(); i++) { + Variable* par = scope()->parameter(i); + Slot* slot = par->AsSlot(); + if (slot != NULL && slot->type() == Slot::CONTEXT) { + // The use of SlotOperand below is safe in unspilled code + // because the slot is guaranteed to be a context slot. + // + // There are no parameters in the global scope. + ASSERT(!scope()->is_global_scope()); + frame_->PushParameterAt(i); + Result value = frame_->Pop(); + value.ToRegister(); + + // SlotOperand loads context.reg() with the context object + // stored to, used below in RecordWrite. + Result context = allocator_->Allocate(); + ASSERT(context.is_valid()); + __ mov(SlotOperand(slot, context.reg()), value.reg()); + int offset = FixedArray::kHeaderSize + slot->index() * kPointerSize; + Result scratch = allocator_->Allocate(); + ASSERT(scratch.is_valid()); + frame_->Spill(context.reg()); + frame_->Spill(value.reg()); + __ RecordWrite(context.reg(), offset, value.reg(), scratch.reg()); + } + } + } + + // Store the arguments object. This must happen after context + // initialization because the arguments object may be stored in + // the context. + if (ArgumentsMode() != NO_ARGUMENTS_ALLOCATION) { + StoreArgumentsObject(true); + } + + // Initialize ThisFunction reference if present. + if (scope()->is_function_scope() && scope()->function() != NULL) { + frame_->Push(FACTORY->the_hole_value()); + StoreToSlot(scope()->function()->AsSlot(), NOT_CONST_INIT); + } + + + // Initialize the function return target after the locals are set + // up, because it needs the expected frame height from the frame. + function_return_.set_direction(JumpTarget::BIDIRECTIONAL); + function_return_is_shadowed_ = false; + + // Generate code to 'execute' declarations and initialize functions + // (source elements). In case of an illegal redeclaration we need to + // handle that instead of processing the declarations. + if (scope()->HasIllegalRedeclaration()) { + Comment cmnt(masm_, "[ illegal redeclarations"); + scope()->VisitIllegalRedeclaration(this); + } else { + Comment cmnt(masm_, "[ declarations"); + ProcessDeclarations(scope()->declarations()); + // Bail out if a stack-overflow exception occurred when processing + // declarations. + if (HasStackOverflow()) return; + } + + if (FLAG_trace) { + frame_->CallRuntime(Runtime::kTraceEnter, 0); + // Ignore the return value. + } + CheckStack(); + + // Compile the body of the function in a vanilla state. Don't + // bother compiling all the code if the scope has an illegal + // redeclaration. + if (!scope()->HasIllegalRedeclaration()) { + Comment cmnt(masm_, "[ function body"); +#ifdef DEBUG + bool is_builtin = info->isolate()->bootstrapper()->IsActive(); + bool should_trace = + is_builtin ? FLAG_trace_builtin_calls : FLAG_trace_calls; + if (should_trace) { + frame_->CallRuntime(Runtime::kDebugTrace, 0); + // Ignore the return value. + } +#endif + VisitStatements(info->function()->body()); + + // Handle the return from the function. + if (has_valid_frame()) { + // If there is a valid frame, control flow can fall off the end of + // the body. In that case there is an implicit return statement. + ASSERT(!function_return_is_shadowed_); + CodeForReturnPosition(info->function()); + frame_->PrepareForReturn(); + Result undefined(FACTORY->undefined_value()); + if (function_return_.is_bound()) { + function_return_.Jump(&undefined); + } else { + function_return_.Bind(&undefined); + GenerateReturnSequence(&undefined); + } + } else if (function_return_.is_linked()) { + // If the return target has dangling jumps to it, then we have not + // yet generated the return sequence. This can happen when (a) + // control does not flow off the end of the body so we did not + // compile an artificial return statement just above, and (b) there + // are return statements in the body but (c) they are all shadowed. + Result return_value; + function_return_.Bind(&return_value); + GenerateReturnSequence(&return_value); + } + } + } + + // Adjust for function-level loop nesting. + ASSERT_EQ(loop_nesting_, info->is_in_loop() ? 1 : 0); + loop_nesting_ = 0; + + // Code generation state must be reset. + ASSERT(state_ == NULL); + ASSERT(!function_return_is_shadowed_); + function_return_.Unuse(); + DeleteFrame(); + + // Process any deferred code using the register allocator. + if (!HasStackOverflow()) { + info->isolate()->set_jump_target_compiling_deferred_code(true); + ProcessDeferred(); + info->isolate()->set_jump_target_compiling_deferred_code(false); + } + + // There is no need to delete the register allocator, it is a + // stack-allocated local. + allocator_ = NULL; +} + + +Operand CodeGenerator::SlotOperand(Slot* slot, Register tmp) { + // Currently, this assertion will fail if we try to assign to + // a constant variable that is constant because it is read-only + // (such as the variable referring to a named function expression). + // We need to implement assignments to read-only variables. + // Ideally, we should do this during AST generation (by converting + // such assignments into expression statements); however, in general + // we may not be able to make the decision until past AST generation, + // that is when the entire program is known. + ASSERT(slot != NULL); + int index = slot->index(); + switch (slot->type()) { + case Slot::PARAMETER: + return frame_->ParameterAt(index); + + case Slot::LOCAL: + return frame_->LocalAt(index); + + case Slot::CONTEXT: { + // Follow the context chain if necessary. + ASSERT(!tmp.is(esi)); // do not overwrite context register + Register context = esi; + int chain_length = scope()->ContextChainLength(slot->var()->scope()); + for (int i = 0; i < chain_length; i++) { + // Load the closure. + // (All contexts, even 'with' contexts, have a closure, + // and it is the same for all contexts inside a function. + // There is no need to go to the function context first.) + __ mov(tmp, ContextOperand(context, Context::CLOSURE_INDEX)); + // Load the function context (which is the incoming, outer context). + __ mov(tmp, FieldOperand(tmp, JSFunction::kContextOffset)); + context = tmp; + } + // We may have a 'with' context now. Get the function context. + // (In fact this mov may never be the needed, since the scope analysis + // may not permit a direct context access in this case and thus we are + // always at a function context. However it is safe to dereference be- + // cause the function context of a function context is itself. Before + // deleting this mov we should try to create a counter-example first, + // though...) + __ mov(tmp, ContextOperand(context, Context::FCONTEXT_INDEX)); + return ContextOperand(tmp, index); + } + + default: + UNREACHABLE(); + return Operand(eax); + } +} + + +Operand CodeGenerator::ContextSlotOperandCheckExtensions(Slot* slot, + Result tmp, + JumpTarget* slow) { + ASSERT(slot->type() == Slot::CONTEXT); + ASSERT(tmp.is_register()); + Register context = esi; + + for (Scope* s = scope(); s != slot->var()->scope(); s = s->outer_scope()) { + if (s->num_heap_slots() > 0) { + if (s->calls_eval()) { + // Check that extension is NULL. + __ cmp(ContextOperand(context, Context::EXTENSION_INDEX), + Immediate(0)); + slow->Branch(not_equal, not_taken); + } + __ mov(tmp.reg(), ContextOperand(context, Context::CLOSURE_INDEX)); + __ mov(tmp.reg(), FieldOperand(tmp.reg(), JSFunction::kContextOffset)); + context = tmp.reg(); + } + } + // Check that last extension is NULL. + __ cmp(ContextOperand(context, Context::EXTENSION_INDEX), Immediate(0)); + slow->Branch(not_equal, not_taken); + __ mov(tmp.reg(), ContextOperand(context, Context::FCONTEXT_INDEX)); + return ContextOperand(tmp.reg(), slot->index()); +} + + +// Emit code to load the value of an expression to the top of the +// frame. If the expression is boolean-valued it may be compiled (or +// partially compiled) into control flow to the control destination. +// If force_control is true, control flow is forced. +void CodeGenerator::LoadCondition(Expression* expr, + ControlDestination* dest, + bool force_control) { + ASSERT(!in_spilled_code()); + int original_height = frame_->height(); + + { CodeGenState new_state(this, dest); + Visit(expr); + + // If we hit a stack overflow, we may not have actually visited + // the expression. In that case, we ensure that we have a + // valid-looking frame state because we will continue to generate + // code as we unwind the C++ stack. + // + // It's possible to have both a stack overflow and a valid frame + // state (eg, a subexpression overflowed, visiting it returned + // with a dummied frame state, and visiting this expression + // returned with a normal-looking state). + if (HasStackOverflow() && + !dest->is_used() && + frame_->height() == original_height) { + dest->Goto(true); + } + } + + if (force_control && !dest->is_used()) { + // Convert the TOS value into flow to the control destination. + ToBoolean(dest); + } + + ASSERT(!(force_control && !dest->is_used())); + ASSERT(dest->is_used() || frame_->height() == original_height + 1); +} + + +void CodeGenerator::LoadAndSpill(Expression* expression) { + ASSERT(in_spilled_code()); + set_in_spilled_code(false); + Load(expression); + frame_->SpillAll(); + set_in_spilled_code(true); +} + + +void CodeGenerator::LoadInSafeInt32Mode(Expression* expr, + BreakTarget* unsafe_bailout) { + set_unsafe_bailout(unsafe_bailout); + set_in_safe_int32_mode(true); + Load(expr); + Result value = frame_->Pop(); + ASSERT(frame_->HasNoUntaggedInt32Elements()); + if (expr->GuaranteedSmiResult()) { + ConvertInt32ResultToSmi(&value); + } else { + ConvertInt32ResultToNumber(&value); + } + set_in_safe_int32_mode(false); + set_unsafe_bailout(NULL); + frame_->Push(&value); +} + + +void CodeGenerator::LoadWithSafeInt32ModeDisabled(Expression* expr) { + set_safe_int32_mode_enabled(false); + Load(expr); + set_safe_int32_mode_enabled(true); +} + + +void CodeGenerator::ConvertInt32ResultToSmi(Result* value) { + ASSERT(value->is_untagged_int32()); + if (value->is_register()) { + __ add(value->reg(), Operand(value->reg())); + } else { + ASSERT(value->is_constant()); + ASSERT(value->handle()->IsSmi()); + } + value->set_untagged_int32(false); + value->set_type_info(TypeInfo::Smi()); +} + + +void CodeGenerator::ConvertInt32ResultToNumber(Result* value) { + ASSERT(value->is_untagged_int32()); + if (value->is_register()) { + Register val = value->reg(); + JumpTarget done; + __ add(val, Operand(val)); + done.Branch(no_overflow, value); + __ sar(val, 1); + // If there was an overflow, bits 30 and 31 of the original number disagree. + __ xor_(val, 0x80000000u); + if (CpuFeatures::IsSupported(SSE2)) { + CpuFeatures::Scope fscope(SSE2); + __ cvtsi2sd(xmm0, Operand(val)); + } else { + // Move val to ST[0] in the FPU + // Push and pop are safe with respect to the virtual frame because + // all synced elements are below the actual stack pointer. + __ push(val); + __ fild_s(Operand(esp, 0)); + __ pop(val); + } + Result scratch = allocator_->Allocate(); + ASSERT(scratch.is_register()); + Label allocation_failed; + __ AllocateHeapNumber(val, scratch.reg(), + no_reg, &allocation_failed); + VirtualFrame* clone = new VirtualFrame(frame_); + scratch.Unuse(); + if (CpuFeatures::IsSupported(SSE2)) { + CpuFeatures::Scope fscope(SSE2); + __ movdbl(FieldOperand(val, HeapNumber::kValueOffset), xmm0); + } else { + __ fstp_d(FieldOperand(val, HeapNumber::kValueOffset)); + } + done.Jump(value); + + // Establish the virtual frame, cloned from where AllocateHeapNumber + // jumped to allocation_failed. + RegisterFile empty_regs; + SetFrame(clone, &empty_regs); + __ bind(&allocation_failed); + if (!CpuFeatures::IsSupported(SSE2)) { + // Pop the value from the floating point stack. + __ fstp(0); + } + unsafe_bailout_->Jump(); + + done.Bind(value); + } else { + ASSERT(value->is_constant()); + } + value->set_untagged_int32(false); + value->set_type_info(TypeInfo::Integer32()); +} + + +void CodeGenerator::Load(Expression* expr) { +#ifdef DEBUG + int original_height = frame_->height(); +#endif + ASSERT(!in_spilled_code()); + + // If the expression should be a side-effect-free 32-bit int computation, + // compile that SafeInt32 path, and a bailout path. + if (!in_safe_int32_mode() && + safe_int32_mode_enabled() && + expr->side_effect_free() && + expr->num_bit_ops() > 2 && + CpuFeatures::IsSupported(SSE2)) { + BreakTarget unsafe_bailout; + JumpTarget done; + unsafe_bailout.set_expected_height(frame_->height()); + LoadInSafeInt32Mode(expr, &unsafe_bailout); + done.Jump(); + + if (unsafe_bailout.is_linked()) { + unsafe_bailout.Bind(); + LoadWithSafeInt32ModeDisabled(expr); + } + done.Bind(); + } else { + JumpTarget true_target; + JumpTarget false_target; + ControlDestination dest(&true_target, &false_target, true); + LoadCondition(expr, &dest, false); + + if (dest.false_was_fall_through()) { + // The false target was just bound. + JumpTarget loaded; + frame_->Push(FACTORY->false_value()); + // There may be dangling jumps to the true target. + if (true_target.is_linked()) { + loaded.Jump(); + true_target.Bind(); + frame_->Push(FACTORY->true_value()); + loaded.Bind(); + } + + } else if (dest.is_used()) { + // There is true, and possibly false, control flow (with true as + // the fall through). + JumpTarget loaded; + frame_->Push(FACTORY->true_value()); + if (false_target.is_linked()) { + loaded.Jump(); + false_target.Bind(); + frame_->Push(FACTORY->false_value()); + loaded.Bind(); + } + + } else { + // We have a valid value on top of the frame, but we still may + // have dangling jumps to the true and false targets from nested + // subexpressions (eg, the left subexpressions of the + // short-circuited boolean operators). + ASSERT(has_valid_frame()); + if (true_target.is_linked() || false_target.is_linked()) { + JumpTarget loaded; + loaded.Jump(); // Don't lose the current TOS. + if (true_target.is_linked()) { + true_target.Bind(); + frame_->Push(FACTORY->true_value()); + if (false_target.is_linked()) { + loaded.Jump(); + } + } + if (false_target.is_linked()) { + false_target.Bind(); + frame_->Push(FACTORY->false_value()); + } + loaded.Bind(); + } + } + } + ASSERT(has_valid_frame()); + ASSERT(frame_->height() == original_height + 1); +} + + +void CodeGenerator::LoadGlobal() { + if (in_spilled_code()) { + frame_->EmitPush(GlobalObjectOperand()); + } else { + Result temp = allocator_->Allocate(); + __ mov(temp.reg(), GlobalObjectOperand()); + frame_->Push(&temp); + } +} + + +void CodeGenerator::LoadGlobalReceiver() { + Result temp = allocator_->Allocate(); + Register reg = temp.reg(); + __ mov(reg, GlobalObjectOperand()); + __ mov(reg, FieldOperand(reg, GlobalObject::kGlobalReceiverOffset)); + frame_->Push(&temp); +} + + +void CodeGenerator::LoadTypeofExpression(Expression* expr) { + // Special handling of identifiers as subexpressions of typeof. + Variable* variable = expr->AsVariableProxy()->AsVariable(); + if (variable != NULL && !variable->is_this() && variable->is_global()) { + // For a global variable we build the property reference + // <global>.<variable> and perform a (regular non-contextual) property + // load to make sure we do not get reference errors. + Slot global(variable, Slot::CONTEXT, Context::GLOBAL_INDEX); + Literal key(variable->name()); + Property property(&global, &key, RelocInfo::kNoPosition); + Reference ref(this, &property); + ref.GetValue(); + } else if (variable != NULL && variable->AsSlot() != NULL) { + // For a variable that rewrites to a slot, we signal it is the immediate + // subexpression of a typeof. + LoadFromSlotCheckForArguments(variable->AsSlot(), INSIDE_TYPEOF); + } else { + // Anything else can be handled normally. + Load(expr); + } +} + + +ArgumentsAllocationMode CodeGenerator::ArgumentsMode() { + if (scope()->arguments() == NULL) return NO_ARGUMENTS_ALLOCATION; + + // In strict mode there is no need for shadow arguments. + ASSERT(scope()->arguments_shadow() != NULL || scope()->is_strict_mode()); + + // We don't want to do lazy arguments allocation for functions that + // have heap-allocated contexts, because it interfers with the + // uninitialized const tracking in the context objects. + return (scope()->num_heap_slots() > 0 || scope()->is_strict_mode()) + ? EAGER_ARGUMENTS_ALLOCATION + : LAZY_ARGUMENTS_ALLOCATION; +} + + +Result CodeGenerator::StoreArgumentsObject(bool initial) { + ArgumentsAllocationMode mode = ArgumentsMode(); + ASSERT(mode != NO_ARGUMENTS_ALLOCATION); + + Comment cmnt(masm_, "[ store arguments object"); + if (mode == LAZY_ARGUMENTS_ALLOCATION && initial) { + // When using lazy arguments allocation, we store the arguments marker value + // as a sentinel indicating that the arguments object hasn't been + // allocated yet. + frame_->Push(FACTORY->arguments_marker()); + } else { + ArgumentsAccessStub stub(is_strict_mode() + ? ArgumentsAccessStub::NEW_STRICT + : ArgumentsAccessStub::NEW_NON_STRICT); + frame_->PushFunction(); + frame_->PushReceiverSlotAddress(); + frame_->Push(Smi::FromInt(scope()->num_parameters())); + Result result = frame_->CallStub(&stub, 3); + frame_->Push(&result); + } + + Variable* arguments = scope()->arguments(); + Variable* shadow = scope()->arguments_shadow(); + + ASSERT(arguments != NULL && arguments->AsSlot() != NULL); + ASSERT((shadow != NULL && shadow->AsSlot() != NULL) || + scope()->is_strict_mode()); + + JumpTarget done; + bool skip_arguments = false; + if (mode == LAZY_ARGUMENTS_ALLOCATION && !initial) { + // We have to skip storing into the arguments slot if it has + // already been written to. This can happen if the a function + // has a local variable named 'arguments'. + LoadFromSlot(arguments->AsSlot(), NOT_INSIDE_TYPEOF); + Result probe = frame_->Pop(); + if (probe.is_constant()) { + // We have to skip updating the arguments object if it has + // been assigned a proper value. + skip_arguments = !probe.handle()->IsArgumentsMarker(); + } else { + __ cmp(Operand(probe.reg()), Immediate(FACTORY->arguments_marker())); + probe.Unuse(); + done.Branch(not_equal); + } + } + if (!skip_arguments) { + StoreToSlot(arguments->AsSlot(), NOT_CONST_INIT); + if (mode == LAZY_ARGUMENTS_ALLOCATION) done.Bind(); + } + if (shadow != NULL) { + StoreToSlot(shadow->AsSlot(), NOT_CONST_INIT); + } + return frame_->Pop(); +} + +//------------------------------------------------------------------------------ +// CodeGenerator implementation of variables, lookups, and stores. + +Reference::Reference(CodeGenerator* cgen, + Expression* expression, + bool persist_after_get) + : cgen_(cgen), + expression_(expression), + type_(ILLEGAL), + persist_after_get_(persist_after_get) { + cgen->LoadReference(this); +} + + +Reference::~Reference() { + ASSERT(is_unloaded() || is_illegal()); +} + + +void CodeGenerator::LoadReference(Reference* ref) { + // References are loaded from both spilled and unspilled code. Set the + // state to unspilled to allow that (and explicitly spill after + // construction at the construction sites). + bool was_in_spilled_code = in_spilled_code_; + in_spilled_code_ = false; + + Comment cmnt(masm_, "[ LoadReference"); + Expression* e = ref->expression(); + Property* property = e->AsProperty(); + Variable* var = e->AsVariableProxy()->AsVariable(); + + if (property != NULL) { + // The expression is either a property or a variable proxy that rewrites + // to a property. + Load(property->obj()); + if (property->key()->IsPropertyName()) { + ref->set_type(Reference::NAMED); + } else { + Load(property->key()); + ref->set_type(Reference::KEYED); + } + } else if (var != NULL) { + // The expression is a variable proxy that does not rewrite to a + // property. Global variables are treated as named property references. + if (var->is_global()) { + // If eax is free, the register allocator prefers it. Thus the code + // generator will load the global object into eax, which is where + // LoadIC wants it. Most uses of Reference call LoadIC directly + // after the reference is created. + frame_->Spill(eax); + LoadGlobal(); + ref->set_type(Reference::NAMED); + } else { + ASSERT(var->AsSlot() != NULL); + ref->set_type(Reference::SLOT); + } + } else { + // Anything else is a runtime error. + Load(e); + frame_->CallRuntime(Runtime::kThrowReferenceError, 1); + } + + in_spilled_code_ = was_in_spilled_code; +} + + +// ECMA-262, section 9.2, page 30: ToBoolean(). Pop the top of stack and +// convert it to a boolean in the condition code register or jump to +// 'false_target'/'true_target' as appropriate. +void CodeGenerator::ToBoolean(ControlDestination* dest) { + Comment cmnt(masm_, "[ ToBoolean"); + + // The value to convert should be popped from the frame. + Result value = frame_->Pop(); + value.ToRegister(); + + if (value.is_integer32()) { // Also takes Smi case. + Comment cmnt(masm_, "ONLY_INTEGER_32"); + if (FLAG_debug_code) { + Label ok; + __ AbortIfNotNumber(value.reg()); + __ test(value.reg(), Immediate(kSmiTagMask)); + __ j(zero, &ok); + __ fldz(); + __ fld_d(FieldOperand(value.reg(), HeapNumber::kValueOffset)); + __ FCmp(); + __ j(not_zero, &ok); + __ Abort("Smi was wrapped in HeapNumber in output from bitop"); + __ bind(&ok); + } + // In the integer32 case there are no Smis hidden in heap numbers, so we + // need only test for Smi zero. + __ test(value.reg(), Operand(value.reg())); + dest->false_target()->Branch(zero); + value.Unuse(); + dest->Split(not_zero); + } else if (value.is_number()) { + Comment cmnt(masm_, "ONLY_NUMBER"); + // Fast case if TypeInfo indicates only numbers. + if (FLAG_debug_code) { + __ AbortIfNotNumber(value.reg()); + } + // Smi => false iff zero. + STATIC_ASSERT(kSmiTag == 0); + __ test(value.reg(), Operand(value.reg())); + dest->false_target()->Branch(zero); + __ test(value.reg(), Immediate(kSmiTagMask)); + dest->true_target()->Branch(zero); + __ fldz(); + __ fld_d(FieldOperand(value.reg(), HeapNumber::kValueOffset)); + __ FCmp(); + value.Unuse(); + dest->Split(not_zero); + } else { + // Fast case checks. + // 'false' => false. + __ cmp(value.reg(), FACTORY->false_value()); + dest->false_target()->Branch(equal); + + // 'true' => true. + __ cmp(value.reg(), FACTORY->true_value()); + dest->true_target()->Branch(equal); + + // 'undefined' => false. + __ cmp(value.reg(), FACTORY->undefined_value()); + dest->false_target()->Branch(equal); + + // Smi => false iff zero. + STATIC_ASSERT(kSmiTag == 0); + __ test(value.reg(), Operand(value.reg())); + dest->false_target()->Branch(zero); + __ test(value.reg(), Immediate(kSmiTagMask)); + dest->true_target()->Branch(zero); + + // Call the stub for all other cases. + frame_->Push(&value); // Undo the Pop() from above. + ToBooleanStub stub; + Result temp = frame_->CallStub(&stub, 1); + // Convert the result to a condition code. + __ test(temp.reg(), Operand(temp.reg())); + temp.Unuse(); + dest->Split(not_equal); + } +} + + +// Perform or call the specialized stub for a binary operation. Requires the +// three registers left, right and dst to be distinct and spilled. This +// deferred operation has up to three entry points: The main one calls the +// runtime system. The second is for when the result is a non-Smi. The +// third is for when at least one of the inputs is non-Smi and we have SSE2. +class DeferredInlineBinaryOperation: public DeferredCode { + public: + DeferredInlineBinaryOperation(Token::Value op, + Register dst, + Register left, + Register right, + TypeInfo left_info, + TypeInfo right_info, + OverwriteMode mode) + : op_(op), dst_(dst), left_(left), right_(right), + left_info_(left_info), right_info_(right_info), mode_(mode) { + set_comment("[ DeferredInlineBinaryOperation"); + ASSERT(!left.is(right)); + } + + virtual void Generate(); + + // This stub makes explicit calls to SaveRegisters(), RestoreRegisters() and + // Exit(). + virtual bool AutoSaveAndRestore() { return false; } + + void JumpToAnswerOutOfRange(Condition cond); + void JumpToConstantRhs(Condition cond, Smi* smi_value); + Label* NonSmiInputLabel(); + + private: + void GenerateAnswerOutOfRange(); + void GenerateNonSmiInput(); + + Token::Value op_; + Register dst_; + Register left_; + Register right_; + TypeInfo left_info_; + TypeInfo right_info_; + OverwriteMode mode_; + Label answer_out_of_range_; + Label non_smi_input_; + Label constant_rhs_; + Smi* smi_value_; +}; + + +Label* DeferredInlineBinaryOperation::NonSmiInputLabel() { + if (Token::IsBitOp(op_) && + CpuFeatures::IsSupported(SSE2)) { + return &non_smi_input_; + } else { + return entry_label(); + } +} + + +void DeferredInlineBinaryOperation::JumpToAnswerOutOfRange(Condition cond) { + __ j(cond, &answer_out_of_range_); +} + + +void DeferredInlineBinaryOperation::JumpToConstantRhs(Condition cond, + Smi* smi_value) { + smi_value_ = smi_value; + __ j(cond, &constant_rhs_); +} + + +void DeferredInlineBinaryOperation::Generate() { + // Registers are not saved implicitly for this stub, so we should not + // tread on the registers that were not passed to us. + if (CpuFeatures::IsSupported(SSE2) && + ((op_ == Token::ADD) || + (op_ == Token::SUB) || + (op_ == Token::MUL) || + (op_ == Token::DIV))) { + CpuFeatures::Scope use_sse2(SSE2); + Label call_runtime, after_alloc_failure; + Label left_smi, right_smi, load_right, do_op; + if (!left_info_.IsSmi()) { + __ test(left_, Immediate(kSmiTagMask)); + __ j(zero, &left_smi); + if (!left_info_.IsNumber()) { + __ cmp(FieldOperand(left_, HeapObject::kMapOffset), + FACTORY->heap_number_map()); + __ j(not_equal, &call_runtime); + } + __ movdbl(xmm0, FieldOperand(left_, HeapNumber::kValueOffset)); + if (mode_ == OVERWRITE_LEFT) { + __ mov(dst_, left_); + } + __ jmp(&load_right); + + __ bind(&left_smi); + } else { + if (FLAG_debug_code) __ AbortIfNotSmi(left_); + } + __ SmiUntag(left_); + __ cvtsi2sd(xmm0, Operand(left_)); + __ SmiTag(left_); + if (mode_ == OVERWRITE_LEFT) { + Label alloc_failure; + __ push(left_); + __ AllocateHeapNumber(dst_, left_, no_reg, &after_alloc_failure); + __ pop(left_); + } + + __ bind(&load_right); + if (!right_info_.IsSmi()) { + __ test(right_, Immediate(kSmiTagMask)); + __ j(zero, &right_smi); + if (!right_info_.IsNumber()) { + __ cmp(FieldOperand(right_, HeapObject::kMapOffset), + FACTORY->heap_number_map()); + __ j(not_equal, &call_runtime); + } + __ movdbl(xmm1, FieldOperand(right_, HeapNumber::kValueOffset)); + if (mode_ == OVERWRITE_RIGHT) { + __ mov(dst_, right_); + } else if (mode_ == NO_OVERWRITE) { + Label alloc_failure; + __ push(left_); + __ AllocateHeapNumber(dst_, left_, no_reg, &after_alloc_failure); + __ pop(left_); + } + __ jmp(&do_op); + + __ bind(&right_smi); + } else { + if (FLAG_debug_code) __ AbortIfNotSmi(right_); + } + __ SmiUntag(right_); + __ cvtsi2sd(xmm1, Operand(right_)); + __ SmiTag(right_); + if (mode_ == OVERWRITE_RIGHT || mode_ == NO_OVERWRITE) { + __ push(left_); + __ AllocateHeapNumber(dst_, left_, no_reg, &after_alloc_failure); + __ pop(left_); + } + + __ bind(&do_op); + switch (op_) { + case Token::ADD: __ addsd(xmm0, xmm1); break; + case Token::SUB: __ subsd(xmm0, xmm1); break; + case Token::MUL: __ mulsd(xmm0, xmm1); break; + case Token::DIV: __ divsd(xmm0, xmm1); break; + default: UNREACHABLE(); + } + __ movdbl(FieldOperand(dst_, HeapNumber::kValueOffset), xmm0); + Exit(); + + + __ bind(&after_alloc_failure); + __ pop(left_); + __ bind(&call_runtime); + } + // Register spilling is not done implicitly for this stub. + // We can't postpone it any more now though. + SaveRegisters(); + + GenericBinaryOpStub stub(op_, + mode_, + NO_SMI_CODE_IN_STUB, + TypeInfo::Combine(left_info_, right_info_)); + stub.GenerateCall(masm_, left_, right_); + if (!dst_.is(eax)) __ mov(dst_, eax); + RestoreRegisters(); + Exit(); + + if (non_smi_input_.is_linked() || constant_rhs_.is_linked()) { + GenerateNonSmiInput(); + } + if (answer_out_of_range_.is_linked()) { + GenerateAnswerOutOfRange(); + } +} + + +void DeferredInlineBinaryOperation::GenerateNonSmiInput() { + // We know at least one of the inputs was not a Smi. + // This is a third entry point into the deferred code. + // We may not overwrite left_ because we want to be able + // to call the handling code for non-smi answer and it + // might want to overwrite the heap number in left_. + ASSERT(!right_.is(dst_)); + ASSERT(!left_.is(dst_)); + ASSERT(!left_.is(right_)); + // This entry point is used for bit ops where the right hand side + // is a constant Smi and the left hand side is a heap object. It + // is also used for bit ops where both sides are unknown, but where + // at least one of them is a heap object. + bool rhs_is_constant = constant_rhs_.is_linked(); + // We can't generate code for both cases. + ASSERT(!non_smi_input_.is_linked() || !constant_rhs_.is_linked()); + + if (FLAG_debug_code) { + __ int3(); // We don't fall through into this code. + } + + __ bind(&non_smi_input_); + + if (rhs_is_constant) { + __ bind(&constant_rhs_); + // In this case the input is a heap object and it is in the dst_ register. + // The left_ and right_ registers have not been initialized yet. + __ mov(right_, Immediate(smi_value_)); + __ mov(left_, Operand(dst_)); + if (!CpuFeatures::IsSupported(SSE2)) { + __ jmp(entry_label()); + return; + } else { + CpuFeatures::Scope use_sse2(SSE2); + __ JumpIfNotNumber(dst_, left_info_, entry_label()); + __ ConvertToInt32(dst_, left_, dst_, left_info_, entry_label()); + __ SmiUntag(right_); + } + } else { + // We know we have SSE2 here because otherwise the label is not linked (see + // NonSmiInputLabel). + CpuFeatures::Scope use_sse2(SSE2); + // Handle the non-constant right hand side situation: + if (left_info_.IsSmi()) { + // Right is a heap object. + __ JumpIfNotNumber(right_, right_info_, entry_label()); + __ ConvertToInt32(right_, right_, dst_, right_info_, entry_label()); + __ mov(dst_, Operand(left_)); + __ SmiUntag(dst_); + } else if (right_info_.IsSmi()) { + // Left is a heap object. + __ JumpIfNotNumber(left_, left_info_, entry_label()); + __ ConvertToInt32(dst_, left_, dst_, left_info_, entry_label()); + __ SmiUntag(right_); + } else { + // Here we don't know if it's one or both that is a heap object. + Label only_right_is_heap_object, got_both; + __ mov(dst_, Operand(left_)); + __ SmiUntag(dst_, &only_right_is_heap_object); + // Left was a heap object. + __ JumpIfNotNumber(left_, left_info_, entry_label()); + __ ConvertToInt32(dst_, left_, dst_, left_info_, entry_label()); + __ SmiUntag(right_, &got_both); + // Both were heap objects. + __ rcl(right_, 1); // Put tag back. + __ JumpIfNotNumber(right_, right_info_, entry_label()); + __ ConvertToInt32(right_, right_, no_reg, right_info_, entry_label()); + __ jmp(&got_both); + __ bind(&only_right_is_heap_object); + __ JumpIfNotNumber(right_, right_info_, entry_label()); + __ ConvertToInt32(right_, right_, no_reg, right_info_, entry_label()); + __ bind(&got_both); + } + } + ASSERT(op_ == Token::BIT_AND || + op_ == Token::BIT_OR || + op_ == Token::BIT_XOR || + right_.is(ecx)); + switch (op_) { + case Token::BIT_AND: __ and_(dst_, Operand(right_)); break; + case Token::BIT_OR: __ or_(dst_, Operand(right_)); break; + case Token::BIT_XOR: __ xor_(dst_, Operand(right_)); break; + case Token::SHR: __ shr_cl(dst_); break; + case Token::SAR: __ sar_cl(dst_); break; + case Token::SHL: __ shl_cl(dst_); break; + default: UNREACHABLE(); + } + if (op_ == Token::SHR) { + // Check that the *unsigned* result fits in a smi. Neither of + // the two high-order bits can be set: + // * 0x80000000: high bit would be lost when smi tagging. + // * 0x40000000: this number would convert to negative when smi + // tagging. + __ test(dst_, Immediate(0xc0000000)); + __ j(not_zero, &answer_out_of_range_); + } else { + // Check that the *signed* result fits in a smi. + __ cmp(dst_, 0xc0000000); + __ j(negative, &answer_out_of_range_); + } + __ SmiTag(dst_); + Exit(); +} + + +void DeferredInlineBinaryOperation::GenerateAnswerOutOfRange() { + Label after_alloc_failure2; + Label allocation_ok; + __ bind(&after_alloc_failure2); + // We have to allocate a number, causing a GC, while keeping hold of + // the answer in dst_. The answer is not a Smi. We can't just call the + // runtime shift function here because we already threw away the inputs. + __ xor_(left_, Operand(left_)); + __ shl(dst_, 1); // Put top bit in carry flag and Smi tag the low bits. + __ rcr(left_, 1); // Rotate with carry. + __ push(dst_); // Smi tagged low 31 bits. + __ push(left_); // 0 or 0x80000000, which is Smi tagged in both cases. + __ CallRuntime(Runtime::kNumberAlloc, 0); + if (!left_.is(eax)) { + __ mov(left_, eax); + } + __ pop(right_); // High bit. + __ pop(dst_); // Low 31 bits. + __ shr(dst_, 1); // Put 0 in top bit. + __ or_(dst_, Operand(right_)); + __ jmp(&allocation_ok); + + // This is the second entry point to the deferred code. It is used only by + // the bit operations. + // The dst_ register has the answer. It is not Smi tagged. If mode_ is + // OVERWRITE_LEFT then left_ must contain either an overwritable heap number + // or a Smi. + // Put a heap number pointer in left_. + __ bind(&answer_out_of_range_); + SaveRegisters(); + if (mode_ == OVERWRITE_LEFT) { + __ test(left_, Immediate(kSmiTagMask)); + __ j(not_zero, &allocation_ok); + } + // This trashes right_. + __ AllocateHeapNumber(left_, right_, no_reg, &after_alloc_failure2); + __ bind(&allocation_ok); + if (CpuFeatures::IsSupported(SSE2) && + op_ != Token::SHR) { + CpuFeatures::Scope use_sse2(SSE2); + ASSERT(Token::IsBitOp(op_)); + // Signed conversion. + __ cvtsi2sd(xmm0, Operand(dst_)); + __ movdbl(FieldOperand(left_, HeapNumber::kValueOffset), xmm0); + } else { + if (op_ == Token::SHR) { + __ push(Immediate(0)); // High word of unsigned value. + __ push(dst_); + __ fild_d(Operand(esp, 0)); + __ Drop(2); + } else { + ASSERT(Token::IsBitOp(op_)); + __ push(dst_); + __ fild_s(Operand(esp, 0)); // Signed conversion. + __ pop(dst_); + } + __ fstp_d(FieldOperand(left_, HeapNumber::kValueOffset)); + } + __ mov(dst_, left_); + RestoreRegisters(); + Exit(); +} + + +static TypeInfo CalculateTypeInfo(TypeInfo operands_type, + Token::Value op, + const Result& right, + const Result& left) { + // Set TypeInfo of result according to the operation performed. + // Rely on the fact that smis have a 31 bit payload on ia32. + STATIC_ASSERT(kSmiValueSize == 31); + switch (op) { + case Token::COMMA: + return right.type_info(); + case Token::OR: + case Token::AND: + // Result type can be either of the two input types. + return operands_type; + case Token::BIT_AND: { + // Anding with positive Smis will give you a Smi. + if (right.is_constant() && right.handle()->IsSmi() && + Smi::cast(*right.handle())->value() >= 0) { + return TypeInfo::Smi(); + } else if (left.is_constant() && left.handle()->IsSmi() && + Smi::cast(*left.handle())->value() >= 0) { + return TypeInfo::Smi(); + } + return (operands_type.IsSmi()) + ? TypeInfo::Smi() + : TypeInfo::Integer32(); + } + case Token::BIT_OR: { + // Oring with negative Smis will give you a Smi. + if (right.is_constant() && right.handle()->IsSmi() && + Smi::cast(*right.handle())->value() < 0) { + return TypeInfo::Smi(); + } else if (left.is_constant() && left.handle()->IsSmi() && + Smi::cast(*left.handle())->value() < 0) { + return TypeInfo::Smi(); + } + return (operands_type.IsSmi()) + ? TypeInfo::Smi() + : TypeInfo::Integer32(); + } + case Token::BIT_XOR: + // Result is always a 32 bit integer. Smi property of inputs is preserved. + return (operands_type.IsSmi()) + ? TypeInfo::Smi() + : TypeInfo::Integer32(); + case Token::SAR: + if (left.is_smi()) return TypeInfo::Smi(); + // Result is a smi if we shift by a constant >= 1, otherwise an integer32. + // Shift amount is masked with 0x1F (ECMA standard 11.7.2). + return (right.is_constant() && right.handle()->IsSmi() + && (Smi::cast(*right.handle())->value() & 0x1F) >= 1) + ? TypeInfo::Smi() + : TypeInfo::Integer32(); + case Token::SHR: + // Result is a smi if we shift by a constant >= 2, an integer32 if + // we shift by 1, and an unsigned 32-bit integer if we shift by 0. + if (right.is_constant() && right.handle()->IsSmi()) { + int shift_amount = Smi::cast(*right.handle())->value() & 0x1F; + if (shift_amount > 1) { + return TypeInfo::Smi(); + } else if (shift_amount > 0) { + return TypeInfo::Integer32(); + } + } + return TypeInfo::Number(); + case Token::ADD: + if (operands_type.IsSmi()) { + // The Integer32 range is big enough to take the sum of any two Smis. + return TypeInfo::Integer32(); + } else if (operands_type.IsNumber()) { + return TypeInfo::Number(); + } else if (left.type_info().IsString() || right.type_info().IsString()) { + return TypeInfo::String(); + } else { + return TypeInfo::Unknown(); + } + case Token::SHL: + return TypeInfo::Integer32(); + case Token::SUB: + // The Integer32 range is big enough to take the difference of any two + // Smis. + return (operands_type.IsSmi()) ? + TypeInfo::Integer32() : + TypeInfo::Number(); + case Token::MUL: + case Token::DIV: + case Token::MOD: + // Result is always a number. + return TypeInfo::Number(); + default: + UNREACHABLE(); + } + UNREACHABLE(); + return TypeInfo::Unknown(); +} + + +void CodeGenerator::GenericBinaryOperation(BinaryOperation* expr, + OverwriteMode overwrite_mode) { + Comment cmnt(masm_, "[ BinaryOperation"); + Token::Value op = expr->op(); + Comment cmnt_token(masm_, Token::String(op)); + + if (op == Token::COMMA) { + // Simply discard left value. + frame_->Nip(1); + return; + } + + Result right = frame_->Pop(); + Result left = frame_->Pop(); + + if (op == Token::ADD) { + const bool left_is_string = left.type_info().IsString(); + const bool right_is_string = right.type_info().IsString(); + // Make sure constant strings have string type info. + ASSERT(!(left.is_constant() && left.handle()->IsString()) || + left_is_string); + ASSERT(!(right.is_constant() && right.handle()->IsString()) || + right_is_string); + if (left_is_string || right_is_string) { + frame_->Push(&left); + frame_->Push(&right); + Result answer; + if (left_is_string) { + if (right_is_string) { + StringAddStub stub(NO_STRING_CHECK_IN_STUB); + answer = frame_->CallStub(&stub, 2); + } else { + StringAddStub stub(NO_STRING_CHECK_LEFT_IN_STUB); + answer = frame_->CallStub(&stub, 2); + } + } else if (right_is_string) { + StringAddStub stub(NO_STRING_CHECK_RIGHT_IN_STUB); + answer = frame_->CallStub(&stub, 2); + } + answer.set_type_info(TypeInfo::String()); + frame_->Push(&answer); + return; + } + // Neither operand is known to be a string. + } + + bool left_is_smi_constant = left.is_constant() && left.handle()->IsSmi(); + bool left_is_non_smi_constant = left.is_constant() && !left.handle()->IsSmi(); + bool right_is_smi_constant = right.is_constant() && right.handle()->IsSmi(); + bool right_is_non_smi_constant = + right.is_constant() && !right.handle()->IsSmi(); + + if (left_is_smi_constant && right_is_smi_constant) { + // Compute the constant result at compile time, and leave it on the frame. + int left_int = Smi::cast(*left.handle())->value(); + int right_int = Smi::cast(*right.handle())->value(); + if (FoldConstantSmis(op, left_int, right_int)) return; + } + + // Get number type of left and right sub-expressions. + TypeInfo operands_type = + TypeInfo::Combine(left.type_info(), right.type_info()); + + TypeInfo result_type = CalculateTypeInfo(operands_type, op, right, left); + + Result answer; + if (left_is_non_smi_constant || right_is_non_smi_constant) { + // Go straight to the slow case, with no smi code. + GenericBinaryOpStub stub(op, + overwrite_mode, + NO_SMI_CODE_IN_STUB, + operands_type); + answer = GenerateGenericBinaryOpStubCall(&stub, &left, &right); + } else if (right_is_smi_constant) { + answer = ConstantSmiBinaryOperation(expr, &left, right.handle(), + false, overwrite_mode); + } else if (left_is_smi_constant) { + answer = ConstantSmiBinaryOperation(expr, &right, left.handle(), + true, overwrite_mode); + } else { + // Set the flags based on the operation, type and loop nesting level. + // Bit operations always assume they likely operate on Smis. Still only + // generate the inline Smi check code if this operation is part of a loop. + // For all other operations only inline the Smi check code for likely smis + // if the operation is part of a loop. + if (loop_nesting() > 0 && + (Token::IsBitOp(op) || + operands_type.IsInteger32() || + expr->type()->IsLikelySmi())) { + answer = LikelySmiBinaryOperation(expr, &left, &right, overwrite_mode); + } else { + GenericBinaryOpStub stub(op, + overwrite_mode, + NO_GENERIC_BINARY_FLAGS, + operands_type); + answer = GenerateGenericBinaryOpStubCall(&stub, &left, &right); + } + } + + answer.set_type_info(result_type); + frame_->Push(&answer); +} + + +Result CodeGenerator::GenerateGenericBinaryOpStubCall(GenericBinaryOpStub* stub, + Result* left, + Result* right) { + if (stub->ArgsInRegistersSupported()) { + stub->SetArgsInRegisters(); + return frame_->CallStub(stub, left, right); + } else { + frame_->Push(left); + frame_->Push(right); + return frame_->CallStub(stub, 2); + } +} + + +bool CodeGenerator::FoldConstantSmis(Token::Value op, int left, int right) { + Object* answer_object = HEAP->undefined_value(); + switch (op) { + case Token::ADD: + if (Smi::IsValid(left + right)) { + answer_object = Smi::FromInt(left + right); + } + break; + case Token::SUB: + if (Smi::IsValid(left - right)) { + answer_object = Smi::FromInt(left - right); + } + break; + case Token::MUL: { + double answer = static_cast<double>(left) * right; + if (answer >= Smi::kMinValue && answer <= Smi::kMaxValue) { + // If the product is zero and the non-zero factor is negative, + // the spec requires us to return floating point negative zero. + if (answer != 0 || (left >= 0 && right >= 0)) { + answer_object = Smi::FromInt(static_cast<int>(answer)); + } + } + } + break; + case Token::DIV: + case Token::MOD: + break; + case Token::BIT_OR: + answer_object = Smi::FromInt(left | right); + break; + case Token::BIT_AND: + answer_object = Smi::FromInt(left & right); + break; + case Token::BIT_XOR: + answer_object = Smi::FromInt(left ^ right); + break; + + case Token::SHL: { + int shift_amount = right & 0x1F; + if (Smi::IsValid(left << shift_amount)) { + answer_object = Smi::FromInt(left << shift_amount); + } + break; + } + case Token::SHR: { + int shift_amount = right & 0x1F; + unsigned int unsigned_left = left; + unsigned_left >>= shift_amount; + if (unsigned_left <= static_cast<unsigned int>(Smi::kMaxValue)) { + answer_object = Smi::FromInt(unsigned_left); + } + break; + } + case Token::SAR: { + int shift_amount = right & 0x1F; + unsigned int unsigned_left = left; + if (left < 0) { + // Perform arithmetic shift of a negative number by + // complementing number, logical shifting, complementing again. + unsigned_left = ~unsigned_left; + unsigned_left >>= shift_amount; + unsigned_left = ~unsigned_left; + } else { + unsigned_left >>= shift_amount; + } + ASSERT(Smi::IsValid(static_cast<int32_t>(unsigned_left))); + answer_object = Smi::FromInt(static_cast<int32_t>(unsigned_left)); + break; + } + default: + UNREACHABLE(); + break; + } + if (answer_object->IsUndefined()) { + return false; + } + frame_->Push(Handle<Object>(answer_object)); + return true; +} + + +void CodeGenerator::JumpIfBothSmiUsingTypeInfo(Result* left, + Result* right, + JumpTarget* both_smi) { + TypeInfo left_info = left->type_info(); + TypeInfo right_info = right->type_info(); + if (left_info.IsDouble() || left_info.IsString() || + right_info.IsDouble() || right_info.IsString()) { + // We know that left and right are not both smi. Don't do any tests. + return; + } + + if (left->reg().is(right->reg())) { + if (!left_info.IsSmi()) { + __ test(left->reg(), Immediate(kSmiTagMask)); + both_smi->Branch(zero); + } else { + if (FLAG_debug_code) __ AbortIfNotSmi(left->reg()); + left->Unuse(); + right->Unuse(); + both_smi->Jump(); + } + } else if (!left_info.IsSmi()) { + if (!right_info.IsSmi()) { + Result temp = allocator_->Allocate(); + ASSERT(temp.is_valid()); + __ mov(temp.reg(), left->reg()); + __ or_(temp.reg(), Operand(right->reg())); + __ test(temp.reg(), Immediate(kSmiTagMask)); + temp.Unuse(); + both_smi->Branch(zero); + } else { + __ test(left->reg(), Immediate(kSmiTagMask)); + both_smi->Branch(zero); + } + } else { + if (FLAG_debug_code) __ AbortIfNotSmi(left->reg()); + if (!right_info.IsSmi()) { + __ test(right->reg(), Immediate(kSmiTagMask)); + both_smi->Branch(zero); + } else { + if (FLAG_debug_code) __ AbortIfNotSmi(right->reg()); + left->Unuse(); + right->Unuse(); + both_smi->Jump(); + } + } +} + + +void CodeGenerator::JumpIfNotBothSmiUsingTypeInfo(Register left, + Register right, + Register scratch, + TypeInfo left_info, + TypeInfo right_info, + DeferredCode* deferred) { + JumpIfNotBothSmiUsingTypeInfo(left, + right, + scratch, + left_info, + right_info, + deferred->entry_label()); +} + + +void CodeGenerator::JumpIfNotBothSmiUsingTypeInfo(Register left, + Register right, + Register scratch, + TypeInfo left_info, + TypeInfo right_info, + Label* on_not_smi) { + if (left.is(right)) { + if (!left_info.IsSmi()) { + __ test(left, Immediate(kSmiTagMask)); + __ j(not_zero, on_not_smi); + } else { + if (FLAG_debug_code) __ AbortIfNotSmi(left); + } + } else if (!left_info.IsSmi()) { + if (!right_info.IsSmi()) { + __ mov(scratch, left); + __ or_(scratch, Operand(right)); + __ test(scratch, Immediate(kSmiTagMask)); + __ j(not_zero, on_not_smi); + } else { + __ test(left, Immediate(kSmiTagMask)); + __ j(not_zero, on_not_smi); + if (FLAG_debug_code) __ AbortIfNotSmi(right); + } + } else { + if (FLAG_debug_code) __ AbortIfNotSmi(left); + if (!right_info.IsSmi()) { + __ test(right, Immediate(kSmiTagMask)); + __ j(not_zero, on_not_smi); + } else { + if (FLAG_debug_code) __ AbortIfNotSmi(right); + } + } +} + + +// Implements a binary operation using a deferred code object and some +// inline code to operate on smis quickly. +Result CodeGenerator::LikelySmiBinaryOperation(BinaryOperation* expr, + Result* left, + Result* right, + OverwriteMode overwrite_mode) { + // Copy the type info because left and right may be overwritten. + TypeInfo left_type_info = left->type_info(); + TypeInfo right_type_info = right->type_info(); + Token::Value op = expr->op(); + Result answer; + // Special handling of div and mod because they use fixed registers. + if (op == Token::DIV || op == Token::MOD) { + // We need eax as the quotient register, edx as the remainder + // register, neither left nor right in eax or edx, and left copied + // to eax. + Result quotient; + Result remainder; + bool left_is_in_eax = false; + // Step 1: get eax for quotient. + if ((left->is_register() && left->reg().is(eax)) || + (right->is_register() && right->reg().is(eax))) { + // One or both is in eax. Use a fresh non-edx register for + // them. + Result fresh = allocator_->Allocate(); + ASSERT(fresh.is_valid()); + if (fresh.reg().is(edx)) { + remainder = fresh; + fresh = allocator_->Allocate(); + ASSERT(fresh.is_valid()); + } + if (left->is_register() && left->reg().is(eax)) { + quotient = *left; + *left = fresh; + left_is_in_eax = true; + } + if (right->is_register() && right->reg().is(eax)) { + quotient = *right; + *right = fresh; + } + __ mov(fresh.reg(), eax); + } else { + // Neither left nor right is in eax. + quotient = allocator_->Allocate(eax); + } + ASSERT(quotient.is_register() && quotient.reg().is(eax)); + ASSERT(!(left->is_register() && left->reg().is(eax))); + ASSERT(!(right->is_register() && right->reg().is(eax))); + + // Step 2: get edx for remainder if necessary. + if (!remainder.is_valid()) { + if ((left->is_register() && left->reg().is(edx)) || + (right->is_register() && right->reg().is(edx))) { + Result fresh = allocator_->Allocate(); + ASSERT(fresh.is_valid()); + if (left->is_register() && left->reg().is(edx)) { + remainder = *left; + *left = fresh; + } + if (right->is_register() && right->reg().is(edx)) { + remainder = *right; + *right = fresh; + } + __ mov(fresh.reg(), edx); + } else { + // Neither left nor right is in edx. + remainder = allocator_->Allocate(edx); + } + } + ASSERT(remainder.is_register() && remainder.reg().is(edx)); + ASSERT(!(left->is_register() && left->reg().is(edx))); + ASSERT(!(right->is_register() && right->reg().is(edx))); + + left->ToRegister(); + right->ToRegister(); + frame_->Spill(eax); + frame_->Spill(edx); + // DeferredInlineBinaryOperation requires all the registers that it is + // told about to be spilled and distinct. + Result distinct_right = frame_->MakeDistinctAndSpilled(left, right); + + // Check that left and right are smi tagged. + DeferredInlineBinaryOperation* deferred = + new DeferredInlineBinaryOperation(op, + (op == Token::DIV) ? eax : edx, + left->reg(), + distinct_right.reg(), + left_type_info, + right_type_info, + overwrite_mode); + JumpIfNotBothSmiUsingTypeInfo(left->reg(), right->reg(), edx, + left_type_info, right_type_info, deferred); + if (!left_is_in_eax) { + __ mov(eax, left->reg()); + } + // Sign extend eax into edx:eax. + __ cdq(); + // Check for 0 divisor. + __ test(right->reg(), Operand(right->reg())); + deferred->Branch(zero); + // Divide edx:eax by the right operand. + __ idiv(right->reg()); + + // Complete the operation. + if (op == Token::DIV) { + // Check for negative zero result. If result is zero, and divisor + // is negative, return a floating point negative zero. The + // virtual frame is unchanged in this block, so local control flow + // can use a Label rather than a JumpTarget. If the context of this + // expression will treat -0 like 0, do not do this test. + if (!expr->no_negative_zero()) { + Label non_zero_result; + __ test(left->reg(), Operand(left->reg())); + __ j(not_zero, &non_zero_result); + __ test(right->reg(), Operand(right->reg())); + deferred->Branch(negative); + __ bind(&non_zero_result); + } + // Check for the corner case of dividing the most negative smi by + // -1. We cannot use the overflow flag, since it is not set by + // idiv instruction. + STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize == 1); + __ cmp(eax, 0x40000000); + deferred->Branch(equal); + // Check that the remainder is zero. + __ test(edx, Operand(edx)); + deferred->Branch(not_zero); + // Tag the result and store it in the quotient register. + __ SmiTag(eax); + deferred->BindExit(); + left->Unuse(); + right->Unuse(); + answer = quotient; + } else { + ASSERT(op == Token::MOD); + // Check for a negative zero result. If the result is zero, and + // the dividend is negative, return a floating point negative + // zero. The frame is unchanged in this block, so local control + // flow can use a Label rather than a JumpTarget. + if (!expr->no_negative_zero()) { + Label non_zero_result; + __ test(edx, Operand(edx)); + __ j(not_zero, &non_zero_result, taken); + __ test(left->reg(), Operand(left->reg())); + deferred->Branch(negative); + __ bind(&non_zero_result); + } + deferred->BindExit(); + left->Unuse(); + right->Unuse(); + answer = remainder; + } + ASSERT(answer.is_valid()); + return answer; + } + + // Special handling of shift operations because they use fixed + // registers. + if (op == Token::SHL || op == Token::SHR || op == Token::SAR) { + // Move left out of ecx if necessary. + if (left->is_register() && left->reg().is(ecx)) { + *left = allocator_->Allocate(); + ASSERT(left->is_valid()); + __ mov(left->reg(), ecx); + } + right->ToRegister(ecx); + left->ToRegister(); + ASSERT(left->is_register() && !left->reg().is(ecx)); + ASSERT(right->is_register() && right->reg().is(ecx)); + if (left_type_info.IsSmi()) { + if (FLAG_debug_code) __ AbortIfNotSmi(left->reg()); + } + if (right_type_info.IsSmi()) { + if (FLAG_debug_code) __ AbortIfNotSmi(right->reg()); + } + + // We will modify right, it must be spilled. + frame_->Spill(ecx); + // DeferredInlineBinaryOperation requires all the registers that it is told + // about to be spilled and distinct. We know that right is ecx and left is + // not ecx. + frame_->Spill(left->reg()); + + // Use a fresh answer register to avoid spilling the left operand. + answer = allocator_->Allocate(); + ASSERT(answer.is_valid()); + + DeferredInlineBinaryOperation* deferred = + new DeferredInlineBinaryOperation(op, + answer.reg(), + left->reg(), + ecx, + left_type_info, + right_type_info, + overwrite_mode); + JumpIfNotBothSmiUsingTypeInfo(left->reg(), right->reg(), answer.reg(), + left_type_info, right_type_info, + deferred->NonSmiInputLabel()); + + // Untag both operands. + __ mov(answer.reg(), left->reg()); + __ SmiUntag(answer.reg()); + __ SmiUntag(right->reg()); // Right is ecx. + + // Perform the operation. + ASSERT(right->reg().is(ecx)); + switch (op) { + case Token::SAR: { + __ sar_cl(answer.reg()); + if (!left_type_info.IsSmi()) { + // Check that the *signed* result fits in a smi. + __ cmp(answer.reg(), 0xc0000000); + deferred->JumpToAnswerOutOfRange(negative); + } + break; + } + case Token::SHR: { + __ shr_cl(answer.reg()); + // Check that the *unsigned* result fits in a smi. Neither of + // the two high-order bits can be set: + // * 0x80000000: high bit would be lost when smi tagging. + // * 0x40000000: this number would convert to negative when smi + // tagging. + // These two cases can only happen with shifts by 0 or 1 when + // handed a valid smi. If the answer cannot be represented by a + // smi, restore the left and right arguments, and jump to slow + // case. The low bit of the left argument may be lost, but only + // in a case where it is dropped anyway. + __ test(answer.reg(), Immediate(0xc0000000)); + deferred->JumpToAnswerOutOfRange(not_zero); + break; + } + case Token::SHL: { + __ shl_cl(answer.reg()); + // Check that the *signed* result fits in a smi. + __ cmp(answer.reg(), 0xc0000000); + deferred->JumpToAnswerOutOfRange(negative); + break; + } + default: + UNREACHABLE(); + } + // Smi-tag the result in answer. + __ SmiTag(answer.reg()); + deferred->BindExit(); + left->Unuse(); + right->Unuse(); + ASSERT(answer.is_valid()); + return answer; + } + + // Handle the other binary operations. + left->ToRegister(); + right->ToRegister(); + // DeferredInlineBinaryOperation requires all the registers that it is told + // about to be spilled. + Result distinct_right = frame_->MakeDistinctAndSpilled(left, right); + // A newly allocated register answer is used to hold the answer. The + // registers containing left and right are not modified so they don't + // need to be spilled in the fast case. + answer = allocator_->Allocate(); + ASSERT(answer.is_valid()); + + // Perform the smi tag check. + DeferredInlineBinaryOperation* deferred = + new DeferredInlineBinaryOperation(op, + answer.reg(), + left->reg(), + distinct_right.reg(), + left_type_info, + right_type_info, + overwrite_mode); + Label non_smi_bit_op; + if (op != Token::BIT_OR) { + JumpIfNotBothSmiUsingTypeInfo(left->reg(), right->reg(), answer.reg(), + left_type_info, right_type_info, + deferred->NonSmiInputLabel()); + } + + __ mov(answer.reg(), left->reg()); + switch (op) { + case Token::ADD: + __ add(answer.reg(), Operand(right->reg())); + deferred->Branch(overflow); + break; + + case Token::SUB: + __ sub(answer.reg(), Operand(right->reg())); + deferred->Branch(overflow); + break; + + case Token::MUL: { + // If the smi tag is 0 we can just leave the tag on one operand. + STATIC_ASSERT(kSmiTag == 0); // Adjust code below if not the case. + // Remove smi tag from the left operand (but keep sign). + // Left-hand operand has been copied into answer. + __ SmiUntag(answer.reg()); + // Do multiplication of smis, leaving result in answer. + __ imul(answer.reg(), Operand(right->reg())); + // Go slow on overflows. + deferred->Branch(overflow); + // Check for negative zero result. If product is zero, and one + // argument is negative, go to slow case. The frame is unchanged + // in this block, so local control flow can use a Label rather + // than a JumpTarget. + if (!expr->no_negative_zero()) { + Label non_zero_result; + __ test(answer.reg(), Operand(answer.reg())); + __ j(not_zero, &non_zero_result, taken); + __ mov(answer.reg(), left->reg()); + __ or_(answer.reg(), Operand(right->reg())); + deferred->Branch(negative); + __ xor_(answer.reg(), Operand(answer.reg())); // Positive 0 is correct. + __ bind(&non_zero_result); + } + break; + } + + case Token::BIT_OR: + __ or_(answer.reg(), Operand(right->reg())); + __ test(answer.reg(), Immediate(kSmiTagMask)); + __ j(not_zero, deferred->NonSmiInputLabel()); + break; + + case Token::BIT_AND: + __ and_(answer.reg(), Operand(right->reg())); + break; + + case Token::BIT_XOR: + __ xor_(answer.reg(), Operand(right->reg())); + break; + + default: + UNREACHABLE(); + break; + } + + deferred->BindExit(); + left->Unuse(); + right->Unuse(); + ASSERT(answer.is_valid()); + return answer; +} + + +// Call the appropriate binary operation stub to compute src op value +// and leave the result in dst. +class DeferredInlineSmiOperation: public DeferredCode { + public: + DeferredInlineSmiOperation(Token::Value op, + Register dst, + Register src, + TypeInfo type_info, + Smi* value, + OverwriteMode overwrite_mode) + : op_(op), + dst_(dst), + src_(src), + type_info_(type_info), + value_(value), + overwrite_mode_(overwrite_mode) { + if (type_info.IsSmi()) overwrite_mode_ = NO_OVERWRITE; + set_comment("[ DeferredInlineSmiOperation"); + } + + virtual void Generate(); + + private: + Token::Value op_; + Register dst_; + Register src_; + TypeInfo type_info_; + Smi* value_; + OverwriteMode overwrite_mode_; +}; + + +void DeferredInlineSmiOperation::Generate() { + // For mod we don't generate all the Smi code inline. + GenericBinaryOpStub stub( + op_, + overwrite_mode_, + (op_ == Token::MOD) ? NO_GENERIC_BINARY_FLAGS : NO_SMI_CODE_IN_STUB, + TypeInfo::Combine(TypeInfo::Smi(), type_info_)); + stub.GenerateCall(masm_, src_, value_); + if (!dst_.is(eax)) __ mov(dst_, eax); +} + + +// Call the appropriate binary operation stub to compute value op src +// and leave the result in dst. +class DeferredInlineSmiOperationReversed: public DeferredCode { + public: + DeferredInlineSmiOperationReversed(Token::Value op, + Register dst, + Smi* value, + Register src, + TypeInfo type_info, + OverwriteMode overwrite_mode) + : op_(op), + dst_(dst), + type_info_(type_info), + value_(value), + src_(src), + overwrite_mode_(overwrite_mode) { + set_comment("[ DeferredInlineSmiOperationReversed"); + } + + virtual void Generate(); + + private: + Token::Value op_; + Register dst_; + TypeInfo type_info_; + Smi* value_; + Register src_; + OverwriteMode overwrite_mode_; +}; + + +void DeferredInlineSmiOperationReversed::Generate() { + GenericBinaryOpStub stub( + op_, + overwrite_mode_, + NO_SMI_CODE_IN_STUB, + TypeInfo::Combine(TypeInfo::Smi(), type_info_)); + stub.GenerateCall(masm_, value_, src_); + if (!dst_.is(eax)) __ mov(dst_, eax); +} + + +// The result of src + value is in dst. It either overflowed or was not +// smi tagged. Undo the speculative addition and call the appropriate +// specialized stub for add. The result is left in dst. +class DeferredInlineSmiAdd: public DeferredCode { + public: + DeferredInlineSmiAdd(Register dst, + TypeInfo type_info, + Smi* value, + OverwriteMode overwrite_mode) + : dst_(dst), + type_info_(type_info), + value_(value), + overwrite_mode_(overwrite_mode) { + if (type_info_.IsSmi()) overwrite_mode_ = NO_OVERWRITE; + set_comment("[ DeferredInlineSmiAdd"); + } + + virtual void Generate(); + + private: + Register dst_; + TypeInfo type_info_; + Smi* value_; + OverwriteMode overwrite_mode_; +}; + + +void DeferredInlineSmiAdd::Generate() { + // Undo the optimistic add operation and call the shared stub. + __ sub(Operand(dst_), Immediate(value_)); + GenericBinaryOpStub igostub( + Token::ADD, + overwrite_mode_, + NO_SMI_CODE_IN_STUB, + TypeInfo::Combine(TypeInfo::Smi(), type_info_)); + igostub.GenerateCall(masm_, dst_, value_); + if (!dst_.is(eax)) __ mov(dst_, eax); +} + + +// The result of value + src is in dst. It either overflowed or was not +// smi tagged. Undo the speculative addition and call the appropriate +// specialized stub for add. The result is left in dst. +class DeferredInlineSmiAddReversed: public DeferredCode { + public: + DeferredInlineSmiAddReversed(Register dst, + TypeInfo type_info, + Smi* value, + OverwriteMode overwrite_mode) + : dst_(dst), + type_info_(type_info), + value_(value), + overwrite_mode_(overwrite_mode) { + set_comment("[ DeferredInlineSmiAddReversed"); + } + + virtual void Generate(); + + private: + Register dst_; + TypeInfo type_info_; + Smi* value_; + OverwriteMode overwrite_mode_; +}; + + +void DeferredInlineSmiAddReversed::Generate() { + // Undo the optimistic add operation and call the shared stub. + __ sub(Operand(dst_), Immediate(value_)); + GenericBinaryOpStub igostub( + Token::ADD, + overwrite_mode_, + NO_SMI_CODE_IN_STUB, + TypeInfo::Combine(TypeInfo::Smi(), type_info_)); + igostub.GenerateCall(masm_, value_, dst_); + if (!dst_.is(eax)) __ mov(dst_, eax); +} + + +// The result of src - value is in dst. It either overflowed or was not +// smi tagged. Undo the speculative subtraction and call the +// appropriate specialized stub for subtract. The result is left in +// dst. +class DeferredInlineSmiSub: public DeferredCode { + public: + DeferredInlineSmiSub(Register dst, + TypeInfo type_info, + Smi* value, + OverwriteMode overwrite_mode) + : dst_(dst), + type_info_(type_info), + value_(value), + overwrite_mode_(overwrite_mode) { + if (type_info.IsSmi()) overwrite_mode_ = NO_OVERWRITE; + set_comment("[ DeferredInlineSmiSub"); + } + + virtual void Generate(); + + private: + Register dst_; + TypeInfo type_info_; + Smi* value_; + OverwriteMode overwrite_mode_; +}; + + +void DeferredInlineSmiSub::Generate() { + // Undo the optimistic sub operation and call the shared stub. + __ add(Operand(dst_), Immediate(value_)); + GenericBinaryOpStub igostub( + Token::SUB, + overwrite_mode_, + NO_SMI_CODE_IN_STUB, + TypeInfo::Combine(TypeInfo::Smi(), type_info_)); + igostub.GenerateCall(masm_, dst_, value_); + if (!dst_.is(eax)) __ mov(dst_, eax); +} + + +Result CodeGenerator::ConstantSmiBinaryOperation(BinaryOperation* expr, + Result* operand, + Handle<Object> value, + bool reversed, + OverwriteMode overwrite_mode) { + // Generate inline code for a binary operation when one of the + // operands is a constant smi. Consumes the argument "operand". + if (IsUnsafeSmi(value)) { + Result unsafe_operand(value); + if (reversed) { + return LikelySmiBinaryOperation(expr, &unsafe_operand, operand, + overwrite_mode); + } else { + return LikelySmiBinaryOperation(expr, operand, &unsafe_operand, + overwrite_mode); + } + } + + // Get the literal value. + Smi* smi_value = Smi::cast(*value); + int int_value = smi_value->value(); + + Token::Value op = expr->op(); + Result answer; + switch (op) { + case Token::ADD: { + operand->ToRegister(); + frame_->Spill(operand->reg()); + + // Optimistically add. Call the specialized add stub if the + // result is not a smi or overflows. + DeferredCode* deferred = NULL; + if (reversed) { + deferred = new DeferredInlineSmiAddReversed(operand->reg(), + operand->type_info(), + smi_value, + overwrite_mode); + } else { + deferred = new DeferredInlineSmiAdd(operand->reg(), + operand->type_info(), + smi_value, + overwrite_mode); + } + __ add(Operand(operand->reg()), Immediate(value)); + deferred->Branch(overflow); + if (!operand->type_info().IsSmi()) { + __ test(operand->reg(), Immediate(kSmiTagMask)); + deferred->Branch(not_zero); + } else if (FLAG_debug_code) { + __ AbortIfNotSmi(operand->reg()); + } + deferred->BindExit(); + answer = *operand; + break; + } + + case Token::SUB: { + DeferredCode* deferred = NULL; + if (reversed) { + // The reversed case is only hit when the right operand is not a + // constant. + ASSERT(operand->is_register()); + answer = allocator()->Allocate(); + ASSERT(answer.is_valid()); + __ Set(answer.reg(), Immediate(value)); + deferred = + new DeferredInlineSmiOperationReversed(op, + answer.reg(), + smi_value, + operand->reg(), + operand->type_info(), + overwrite_mode); + __ sub(answer.reg(), Operand(operand->reg())); + } else { + operand->ToRegister(); + frame_->Spill(operand->reg()); + answer = *operand; + deferred = new DeferredInlineSmiSub(operand->reg(), + operand->type_info(), + smi_value, + overwrite_mode); + __ sub(Operand(operand->reg()), Immediate(value)); + } + deferred->Branch(overflow); + if (!operand->type_info().IsSmi()) { + __ test(answer.reg(), Immediate(kSmiTagMask)); + deferred->Branch(not_zero); + } else if (FLAG_debug_code) { + __ AbortIfNotSmi(operand->reg()); + } + deferred->BindExit(); + operand->Unuse(); + break; + } + + case Token::SAR: + if (reversed) { + Result constant_operand(value); + answer = LikelySmiBinaryOperation(expr, &constant_operand, operand, + overwrite_mode); + } else { + // Only the least significant 5 bits of the shift value are used. + // In the slow case, this masking is done inside the runtime call. + int shift_value = int_value & 0x1f; + operand->ToRegister(); + frame_->Spill(operand->reg()); + if (!operand->type_info().IsSmi()) { + DeferredInlineSmiOperation* deferred = + new DeferredInlineSmiOperation(op, + operand->reg(), + operand->reg(), + operand->type_info(), + smi_value, + overwrite_mode); + __ test(operand->reg(), Immediate(kSmiTagMask)); + deferred->Branch(not_zero); + if (shift_value > 0) { + __ sar(operand->reg(), shift_value); + __ and_(operand->reg(), ~kSmiTagMask); + } + deferred->BindExit(); + } else { + if (FLAG_debug_code) { + __ AbortIfNotSmi(operand->reg()); + } + if (shift_value > 0) { + __ sar(operand->reg(), shift_value); + __ and_(operand->reg(), ~kSmiTagMask); + } + } + answer = *operand; + } + break; + + case Token::SHR: + if (reversed) { + Result constant_operand(value); + answer = LikelySmiBinaryOperation(expr, &constant_operand, operand, + overwrite_mode); + } else { + // Only the least significant 5 bits of the shift value are used. + // In the slow case, this masking is done inside the runtime call. + int shift_value = int_value & 0x1f; + operand->ToRegister(); + answer = allocator()->Allocate(); + ASSERT(answer.is_valid()); + DeferredInlineSmiOperation* deferred = + new DeferredInlineSmiOperation(op, + answer.reg(), + operand->reg(), + operand->type_info(), + smi_value, + overwrite_mode); + if (!operand->type_info().IsSmi()) { + __ test(operand->reg(), Immediate(kSmiTagMask)); + deferred->Branch(not_zero); + } else if (FLAG_debug_code) { + __ AbortIfNotSmi(operand->reg()); + } + __ mov(answer.reg(), operand->reg()); + __ SmiUntag(answer.reg()); + __ shr(answer.reg(), shift_value); + // A negative Smi shifted right two is in the positive Smi range. + if (shift_value < 2) { + __ test(answer.reg(), Immediate(0xc0000000)); + deferred->Branch(not_zero); + } + operand->Unuse(); + __ SmiTag(answer.reg()); + deferred->BindExit(); + } + break; + + case Token::SHL: + if (reversed) { + // Move operand into ecx and also into a second register. + // If operand is already in a register, take advantage of that. + // This lets us modify ecx, but still bail out to deferred code. + Result right; + Result right_copy_in_ecx; + TypeInfo right_type_info = operand->type_info(); + operand->ToRegister(); + if (operand->reg().is(ecx)) { + right = allocator()->Allocate(); + __ mov(right.reg(), ecx); + frame_->Spill(ecx); + right_copy_in_ecx = *operand; + } else { + right_copy_in_ecx = allocator()->Allocate(ecx); + __ mov(ecx, operand->reg()); + right = *operand; + } + operand->Unuse(); + + answer = allocator()->Allocate(); + DeferredInlineSmiOperationReversed* deferred = + new DeferredInlineSmiOperationReversed(op, + answer.reg(), + smi_value, + right.reg(), + right_type_info, + overwrite_mode); + __ mov(answer.reg(), Immediate(int_value)); + __ sar(ecx, kSmiTagSize); + if (!right_type_info.IsSmi()) { + deferred->Branch(carry); + } else if (FLAG_debug_code) { + __ AbortIfNotSmi(right.reg()); + } + __ shl_cl(answer.reg()); + __ cmp(answer.reg(), 0xc0000000); + deferred->Branch(sign); + __ SmiTag(answer.reg()); + + deferred->BindExit(); + } else { + // Only the least significant 5 bits of the shift value are used. + // In the slow case, this masking is done inside the runtime call. + int shift_value = int_value & 0x1f; + operand->ToRegister(); + if (shift_value == 0) { + // Spill operand so it can be overwritten in the slow case. + frame_->Spill(operand->reg()); + DeferredInlineSmiOperation* deferred = + new DeferredInlineSmiOperation(op, + operand->reg(), + operand->reg(), + operand->type_info(), + smi_value, + overwrite_mode); + __ test(operand->reg(), Immediate(kSmiTagMask)); + deferred->Branch(not_zero); + deferred->BindExit(); + answer = *operand; + } else { + // Use a fresh temporary for nonzero shift values. + answer = allocator()->Allocate(); + ASSERT(answer.is_valid()); + DeferredInlineSmiOperation* deferred = + new DeferredInlineSmiOperation(op, + answer.reg(), + operand->reg(), + operand->type_info(), + smi_value, + overwrite_mode); + if (!operand->type_info().IsSmi()) { + __ test(operand->reg(), Immediate(kSmiTagMask)); + deferred->Branch(not_zero); + } else if (FLAG_debug_code) { + __ AbortIfNotSmi(operand->reg()); + } + __ mov(answer.reg(), operand->reg()); + STATIC_ASSERT(kSmiTag == 0); // adjust code if not the case + // We do no shifts, only the Smi conversion, if shift_value is 1. + if (shift_value > 1) { + __ shl(answer.reg(), shift_value - 1); + } + // Convert int result to Smi, checking that it is in int range. + STATIC_ASSERT(kSmiTagSize == 1); // adjust code if not the case + __ add(answer.reg(), Operand(answer.reg())); + deferred->Branch(overflow); + deferred->BindExit(); + operand->Unuse(); + } + } + break; + + case Token::BIT_OR: + case Token::BIT_XOR: + case Token::BIT_AND: { + operand->ToRegister(); + // DeferredInlineBinaryOperation requires all the registers that it is + // told about to be spilled. + frame_->Spill(operand->reg()); + DeferredInlineBinaryOperation* deferred = NULL; + if (!operand->type_info().IsSmi()) { + Result left = allocator()->Allocate(); + ASSERT(left.is_valid()); + Result right = allocator()->Allocate(); + ASSERT(right.is_valid()); + deferred = new DeferredInlineBinaryOperation( + op, + operand->reg(), + left.reg(), + right.reg(), + operand->type_info(), + TypeInfo::Smi(), + overwrite_mode == NO_OVERWRITE ? NO_OVERWRITE : OVERWRITE_LEFT); + __ test(operand->reg(), Immediate(kSmiTagMask)); + deferred->JumpToConstantRhs(not_zero, smi_value); + } else if (FLAG_debug_code) { + __ AbortIfNotSmi(operand->reg()); + } + if (op == Token::BIT_AND) { + __ and_(Operand(operand->reg()), Immediate(value)); + } else if (op == Token::BIT_XOR) { + if (int_value != 0) { + __ xor_(Operand(operand->reg()), Immediate(value)); + } + } else { + ASSERT(op == Token::BIT_OR); + if (int_value != 0) { + __ or_(Operand(operand->reg()), Immediate(value)); + } + } + if (deferred != NULL) deferred->BindExit(); + answer = *operand; + break; + } + + case Token::DIV: + if (!reversed && int_value == 2) { + operand->ToRegister(); + frame_->Spill(operand->reg()); + + DeferredInlineSmiOperation* deferred = + new DeferredInlineSmiOperation(op, + operand->reg(), + operand->reg(), + operand->type_info(), + smi_value, + overwrite_mode); + // Check that lowest log2(value) bits of operand are zero, and test + // smi tag at the same time. + STATIC_ASSERT(kSmiTag == 0); + STATIC_ASSERT(kSmiTagSize == 1); + __ test(operand->reg(), Immediate(3)); + deferred->Branch(not_zero); // Branch if non-smi or odd smi. + __ sar(operand->reg(), 1); + deferred->BindExit(); + answer = *operand; + } else { + // Cannot fall through MOD to default case, so we duplicate the + // default case here. + Result constant_operand(value); + if (reversed) { + answer = LikelySmiBinaryOperation(expr, &constant_operand, operand, + overwrite_mode); + } else { + answer = LikelySmiBinaryOperation(expr, operand, &constant_operand, + overwrite_mode); + } + } + break; + + // Generate inline code for mod of powers of 2 and negative powers of 2. + case Token::MOD: + if (!reversed && + int_value != 0 && + (IsPowerOf2(int_value) || IsPowerOf2(-int_value))) { + operand->ToRegister(); + frame_->Spill(operand->reg()); + DeferredCode* deferred = + new DeferredInlineSmiOperation(op, + operand->reg(), + operand->reg(), + operand->type_info(), + smi_value, + overwrite_mode); + // Check for negative or non-Smi left hand side. + __ test(operand->reg(), Immediate(kSmiTagMask | kSmiSignMask)); + deferred->Branch(not_zero); + if (int_value < 0) int_value = -int_value; + if (int_value == 1) { + __ mov(operand->reg(), Immediate(Smi::FromInt(0))); + } else { + __ and_(operand->reg(), (int_value << kSmiTagSize) - 1); + } + deferred->BindExit(); + answer = *operand; + break; + } + // Fall through if we did not find a power of 2 on the right hand side! + // The next case must be the default. + + default: { + Result constant_operand(value); + if (reversed) { + answer = LikelySmiBinaryOperation(expr, &constant_operand, operand, + overwrite_mode); + } else { + answer = LikelySmiBinaryOperation(expr, operand, &constant_operand, + overwrite_mode); + } + break; + } + } + ASSERT(answer.is_valid()); + return answer; +} + + +static bool CouldBeNaN(const Result& result) { + if (result.type_info().IsSmi()) return false; + if (result.type_info().IsInteger32()) return false; + if (!result.is_constant()) return true; + if (!result.handle()->IsHeapNumber()) return false; + return isnan(HeapNumber::cast(*result.handle())->value()); +} + + +// Convert from signed to unsigned comparison to match the way EFLAGS are set +// by FPU and XMM compare instructions. +static Condition DoubleCondition(Condition cc) { + switch (cc) { + case less: return below; + case equal: return equal; + case less_equal: return below_equal; + case greater: return above; + case greater_equal: return above_equal; + default: UNREACHABLE(); + } + UNREACHABLE(); + return equal; +} + + +static CompareFlags ComputeCompareFlags(NaNInformation nan_info, + bool inline_number_compare) { + CompareFlags flags = NO_SMI_COMPARE_IN_STUB; + if (nan_info == kCantBothBeNaN) { + flags = static_cast<CompareFlags>(flags | CANT_BOTH_BE_NAN); + } + if (inline_number_compare) { + flags = static_cast<CompareFlags>(flags | NO_NUMBER_COMPARE_IN_STUB); + } + return flags; +} + + +void CodeGenerator::Comparison(AstNode* node, + Condition cc, + bool strict, + ControlDestination* dest) { + // Strict only makes sense for equality comparisons. + ASSERT(!strict || cc == equal); + + Result left_side; + Result right_side; + // Implement '>' and '<=' by reversal to obtain ECMA-262 conversion order. + if (cc == greater || cc == less_equal) { + cc = ReverseCondition(cc); + left_side = frame_->Pop(); + right_side = frame_->Pop(); + } else { + right_side = frame_->Pop(); + left_side = frame_->Pop(); + } + ASSERT(cc == less || cc == equal || cc == greater_equal); + + // If either side is a constant smi, optimize the comparison. + bool left_side_constant_smi = false; + bool left_side_constant_null = false; + bool left_side_constant_1_char_string = false; + if (left_side.is_constant()) { + left_side_constant_smi = left_side.handle()->IsSmi(); + left_side_constant_null = left_side.handle()->IsNull(); + left_side_constant_1_char_string = + (left_side.handle()->IsString() && + String::cast(*left_side.handle())->length() == 1 && + String::cast(*left_side.handle())->IsAsciiRepresentation()); + } + bool right_side_constant_smi = false; + bool right_side_constant_null = false; + bool right_side_constant_1_char_string = false; + if (right_side.is_constant()) { + right_side_constant_smi = right_side.handle()->IsSmi(); + right_side_constant_null = right_side.handle()->IsNull(); + right_side_constant_1_char_string = + (right_side.handle()->IsString() && + String::cast(*right_side.handle())->length() == 1 && + String::cast(*right_side.handle())->IsAsciiRepresentation()); + } + + if (left_side_constant_smi || right_side_constant_smi) { + bool is_loop_condition = (node->AsExpression() != NULL) && + node->AsExpression()->is_loop_condition(); + ConstantSmiComparison(cc, strict, dest, &left_side, &right_side, + left_side_constant_smi, right_side_constant_smi, + is_loop_condition); + } else if (left_side_constant_1_char_string || + right_side_constant_1_char_string) { + if (left_side_constant_1_char_string && right_side_constant_1_char_string) { + // Trivial case, comparing two constants. + int left_value = String::cast(*left_side.handle())->Get(0); + int right_value = String::cast(*right_side.handle())->Get(0); + switch (cc) { + case less: + dest->Goto(left_value < right_value); + break; + case equal: + dest->Goto(left_value == right_value); + break; + case greater_equal: + dest->Goto(left_value >= right_value); + break; + default: + UNREACHABLE(); + } + } else { + // Only one side is a constant 1 character string. + // If left side is a constant 1-character string, reverse the operands. + // Since one side is a constant string, conversion order does not matter. + if (left_side_constant_1_char_string) { + Result temp = left_side; + left_side = right_side; + right_side = temp; + cc = ReverseCondition(cc); + // This may reintroduce greater or less_equal as the value of cc. + // CompareStub and the inline code both support all values of cc. + } + // Implement comparison against a constant string, inlining the case + // where both sides are strings. + left_side.ToRegister(); + + // Here we split control flow to the stub call and inlined cases + // before finally splitting it to the control destination. We use + // a jump target and branching to duplicate the virtual frame at + // the first split. We manually handle the off-frame references + // by reconstituting them on the non-fall-through path. + JumpTarget is_not_string, is_string; + Register left_reg = left_side.reg(); + Handle<Object> right_val = right_side.handle(); + ASSERT(StringShape(String::cast(*right_val)).IsSymbol()); + __ test(left_side.reg(), Immediate(kSmiTagMask)); + is_not_string.Branch(zero, &left_side); + Result temp = allocator_->Allocate(); + ASSERT(temp.is_valid()); + __ mov(temp.reg(), + FieldOperand(left_side.reg(), HeapObject::kMapOffset)); + __ movzx_b(temp.reg(), + FieldOperand(temp.reg(), Map::kInstanceTypeOffset)); + // If we are testing for equality then make use of the symbol shortcut. + // Check if the right left hand side has the same type as the left hand + // side (which is always a symbol). + if (cc == equal) { + Label not_a_symbol; + STATIC_ASSERT(kSymbolTag != 0); + // Ensure that no non-strings have the symbol bit set. + STATIC_ASSERT(LAST_TYPE < kNotStringTag + kIsSymbolMask); + __ test(temp.reg(), Immediate(kIsSymbolMask)); // Test the symbol bit. + __ j(zero, ¬_a_symbol); + // They are symbols, so do identity compare. + __ cmp(left_side.reg(), right_side.handle()); + dest->true_target()->Branch(equal); + dest->false_target()->Branch(not_equal); + __ bind(¬_a_symbol); + } + // Call the compare stub if the left side is not a flat ascii string. + __ and_(temp.reg(), + kIsNotStringMask | kStringRepresentationMask | kStringEncodingMask); + __ cmp(temp.reg(), kStringTag | kSeqStringTag | kAsciiStringTag); + temp.Unuse(); + is_string.Branch(equal, &left_side); + + // Setup and call the compare stub. + is_not_string.Bind(&left_side); + CompareFlags flags = + static_cast<CompareFlags>(CANT_BOTH_BE_NAN | NO_SMI_COMPARE_IN_STUB); + CompareStub stub(cc, strict, flags); + Result result = frame_->CallStub(&stub, &left_side, &right_side); + result.ToRegister(); + __ cmp(result.reg(), 0); + result.Unuse(); + dest->true_target()->Branch(cc); + dest->false_target()->Jump(); + + is_string.Bind(&left_side); + // left_side is a sequential ASCII string. + left_side = Result(left_reg); + right_side = Result(right_val); + // Test string equality and comparison. + Label comparison_done; + if (cc == equal) { + __ cmp(FieldOperand(left_side.reg(), String::kLengthOffset), + Immediate(Smi::FromInt(1))); + __ j(not_equal, &comparison_done); + uint8_t char_value = + static_cast<uint8_t>(String::cast(*right_val)->Get(0)); + __ cmpb(FieldOperand(left_side.reg(), SeqAsciiString::kHeaderSize), + char_value); + } else { + __ cmp(FieldOperand(left_side.reg(), String::kLengthOffset), + Immediate(Smi::FromInt(1))); + // If the length is 0 then the jump is taken and the flags + // correctly represent being less than the one-character string. + __ j(below, &comparison_done); + // Compare the first character of the string with the + // constant 1-character string. + uint8_t char_value = + static_cast<uint8_t>(String::cast(*right_val)->Get(0)); + __ cmpb(FieldOperand(left_side.reg(), SeqAsciiString::kHeaderSize), + char_value); + __ j(not_equal, &comparison_done); + // If the first character is the same then the long string sorts after + // the short one. + __ cmp(FieldOperand(left_side.reg(), String::kLengthOffset), + Immediate(Smi::FromInt(1))); + } + __ bind(&comparison_done); + left_side.Unuse(); + right_side.Unuse(); + dest->Split(cc); + } + } else { + // Neither side is a constant Smi, constant 1-char string or constant null. + // If either side is a non-smi constant, or known to be a heap number, + // skip the smi check. + bool known_non_smi = + (left_side.is_constant() && !left_side.handle()->IsSmi()) || + (right_side.is_constant() && !right_side.handle()->IsSmi()) || + left_side.type_info().IsDouble() || + right_side.type_info().IsDouble(); + + NaNInformation nan_info = + (CouldBeNaN(left_side) && CouldBeNaN(right_side)) ? + kBothCouldBeNaN : + kCantBothBeNaN; + + // Inline number comparison handling any combination of smi's and heap + // numbers if: + // code is in a loop + // the compare operation is different from equal + // compare is not a for-loop comparison + // The reason for excluding equal is that it will most likely be done + // with smi's (not heap numbers) and the code to comparing smi's is inlined + // separately. The same reason applies for for-loop comparison which will + // also most likely be smi comparisons. + bool is_loop_condition = (node->AsExpression() != NULL) + && node->AsExpression()->is_loop_condition(); + bool inline_number_compare = + loop_nesting() > 0 && cc != equal && !is_loop_condition; + + // Left and right needed in registers for the following code. + left_side.ToRegister(); + right_side.ToRegister(); + + if (known_non_smi) { + // Inlined equality check: + // If at least one of the objects is not NaN, then if the objects + // are identical, they are equal. + if (nan_info == kCantBothBeNaN && cc == equal) { + __ cmp(left_side.reg(), Operand(right_side.reg())); + dest->true_target()->Branch(equal); + } + + // Inlined number comparison: + if (inline_number_compare) { + GenerateInlineNumberComparison(&left_side, &right_side, cc, dest); + } + + // End of in-line compare, call out to the compare stub. Don't include + // number comparison in the stub if it was inlined. + CompareFlags flags = ComputeCompareFlags(nan_info, inline_number_compare); + CompareStub stub(cc, strict, flags); + Result answer = frame_->CallStub(&stub, &left_side, &right_side); + __ test(answer.reg(), Operand(answer.reg())); + answer.Unuse(); + dest->Split(cc); + } else { + // Here we split control flow to the stub call and inlined cases + // before finally splitting it to the control destination. We use + // a jump target and branching to duplicate the virtual frame at + // the first split. We manually handle the off-frame references + // by reconstituting them on the non-fall-through path. + JumpTarget is_smi; + Register left_reg = left_side.reg(); + Register right_reg = right_side.reg(); + + // In-line check for comparing two smis. + JumpIfBothSmiUsingTypeInfo(&left_side, &right_side, &is_smi); + + if (has_valid_frame()) { + // Inline the equality check if both operands can't be a NaN. If both + // objects are the same they are equal. + if (nan_info == kCantBothBeNaN && cc == equal) { + __ cmp(left_side.reg(), Operand(right_side.reg())); + dest->true_target()->Branch(equal); + } + + // Inlined number comparison: + if (inline_number_compare) { + GenerateInlineNumberComparison(&left_side, &right_side, cc, dest); + } + + // End of in-line compare, call out to the compare stub. Don't include + // number comparison in the stub if it was inlined. + CompareFlags flags = + ComputeCompareFlags(nan_info, inline_number_compare); + CompareStub stub(cc, strict, flags); + Result answer = frame_->CallStub(&stub, &left_side, &right_side); + __ test(answer.reg(), Operand(answer.reg())); + answer.Unuse(); + if (is_smi.is_linked()) { + dest->true_target()->Branch(cc); + dest->false_target()->Jump(); + } else { + dest->Split(cc); + } + } + + if (is_smi.is_linked()) { + is_smi.Bind(); + left_side = Result(left_reg); + right_side = Result(right_reg); + __ cmp(left_side.reg(), Operand(right_side.reg())); + right_side.Unuse(); + left_side.Unuse(); + dest->Split(cc); + } + } + } +} + + +void CodeGenerator::ConstantSmiComparison(Condition cc, + bool strict, + ControlDestination* dest, + Result* left_side, + Result* right_side, + bool left_side_constant_smi, + bool right_side_constant_smi, + bool is_loop_condition) { + if (left_side_constant_smi && right_side_constant_smi) { + // Trivial case, comparing two constants. + int left_value = Smi::cast(*left_side->handle())->value(); + int right_value = Smi::cast(*right_side->handle())->value(); + switch (cc) { + case less: + dest->Goto(left_value < right_value); + break; + case equal: + dest->Goto(left_value == right_value); + break; + case greater_equal: + dest->Goto(left_value >= right_value); + break; + default: + UNREACHABLE(); + } + } else { + // Only one side is a constant Smi. + // If left side is a constant Smi, reverse the operands. + // Since one side is a constant Smi, conversion order does not matter. + if (left_side_constant_smi) { + Result* temp = left_side; + left_side = right_side; + right_side = temp; + cc = ReverseCondition(cc); + // This may re-introduce greater or less_equal as the value of cc. + // CompareStub and the inline code both support all values of cc. + } + // Implement comparison against a constant Smi, inlining the case + // where both sides are Smis. + left_side->ToRegister(); + Register left_reg = left_side->reg(); + Handle<Object> right_val = right_side->handle(); + + if (left_side->is_smi()) { + if (FLAG_debug_code) { + __ AbortIfNotSmi(left_reg); + } + // Test smi equality and comparison by signed int comparison. + if (IsUnsafeSmi(right_side->handle())) { + right_side->ToRegister(); + __ cmp(left_reg, Operand(right_side->reg())); + } else { + __ cmp(Operand(left_reg), Immediate(right_side->handle())); + } + left_side->Unuse(); + right_side->Unuse(); + dest->Split(cc); + } else { + // Only the case where the left side could possibly be a non-smi is left. + JumpTarget is_smi; + if (cc == equal) { + // We can do the equality comparison before the smi check. + __ cmp(Operand(left_reg), Immediate(right_side->handle())); + dest->true_target()->Branch(equal); + __ test(left_reg, Immediate(kSmiTagMask)); + dest->false_target()->Branch(zero); + } else { + // Do the smi check, then the comparison. + __ test(left_reg, Immediate(kSmiTagMask)); + is_smi.Branch(zero, left_side, right_side); + } + + // Jump or fall through to here if we are comparing a non-smi to a + // constant smi. If the non-smi is a heap number and this is not + // a loop condition, inline the floating point code. + if (!is_loop_condition && + CpuFeatures::IsSupported(SSE2)) { + // Right side is a constant smi and left side has been checked + // not to be a smi. + CpuFeatures::Scope use_sse2(SSE2); + JumpTarget not_number; + __ cmp(FieldOperand(left_reg, HeapObject::kMapOffset), + Immediate(FACTORY->heap_number_map())); + not_number.Branch(not_equal, left_side); + __ movdbl(xmm1, + FieldOperand(left_reg, HeapNumber::kValueOffset)); + int value = Smi::cast(*right_val)->value(); + if (value == 0) { + __ xorpd(xmm0, xmm0); + } else { + Result temp = allocator()->Allocate(); + __ mov(temp.reg(), Immediate(value)); + __ cvtsi2sd(xmm0, Operand(temp.reg())); + temp.Unuse(); + } + __ ucomisd(xmm1, xmm0); + // Jump to builtin for NaN. + not_number.Branch(parity_even, left_side); + left_side->Unuse(); + dest->true_target()->Branch(DoubleCondition(cc)); + dest->false_target()->Jump(); + not_number.Bind(left_side); + } + + // Setup and call the compare stub. + CompareFlags flags = + static_cast<CompareFlags>(CANT_BOTH_BE_NAN | NO_SMI_CODE_IN_STUB); + CompareStub stub(cc, strict, flags); + Result result = frame_->CallStub(&stub, left_side, right_side); + result.ToRegister(); + __ test(result.reg(), Operand(result.reg())); + result.Unuse(); + if (cc == equal) { + dest->Split(cc); + } else { + dest->true_target()->Branch(cc); + dest->false_target()->Jump(); + + // It is important for performance for this case to be at the end. + is_smi.Bind(left_side, right_side); + if (IsUnsafeSmi(right_side->handle())) { + right_side->ToRegister(); + __ cmp(left_reg, Operand(right_side->reg())); + } else { + __ cmp(Operand(left_reg), Immediate(right_side->handle())); + } + left_side->Unuse(); + right_side->Unuse(); + dest->Split(cc); + } + } + } +} + + +// Check that the comparison operand is a number. Jump to not_numbers jump +// target passing the left and right result if the operand is not a number. +static void CheckComparisonOperand(MacroAssembler* masm_, + Result* operand, + Result* left_side, + Result* right_side, + JumpTarget* not_numbers) { + // Perform check if operand is not known to be a number. + if (!operand->type_info().IsNumber()) { + Label done; + __ test(operand->reg(), Immediate(kSmiTagMask)); + __ j(zero, &done); + __ cmp(FieldOperand(operand->reg(), HeapObject::kMapOffset), + Immediate(FACTORY->heap_number_map())); + not_numbers->Branch(not_equal, left_side, right_side, not_taken); + __ bind(&done); + } +} + + +// Load a comparison operand to the FPU stack. This assumes that the operand has +// already been checked and is a number. +static void LoadComparisonOperand(MacroAssembler* masm_, + Result* operand) { + Label done; + if (operand->type_info().IsDouble()) { + // Operand is known to be a heap number, just load it. + __ fld_d(FieldOperand(operand->reg(), HeapNumber::kValueOffset)); + } else if (operand->type_info().IsSmi()) { + // Operand is known to be a smi. Convert it to double and keep the original + // smi. + __ SmiUntag(operand->reg()); + __ push(operand->reg()); + __ fild_s(Operand(esp, 0)); + __ pop(operand->reg()); + __ SmiTag(operand->reg()); + } else { + // Operand type not known, check for smi otherwise assume heap number. + Label smi; + __ test(operand->reg(), Immediate(kSmiTagMask)); + __ j(zero, &smi); + __ fld_d(FieldOperand(operand->reg(), HeapNumber::kValueOffset)); + __ jmp(&done); + __ bind(&smi); + __ SmiUntag(operand->reg()); + __ push(operand->reg()); + __ fild_s(Operand(esp, 0)); + __ pop(operand->reg()); + __ SmiTag(operand->reg()); + __ jmp(&done); + } + __ bind(&done); +} + + +// Load a comparison operand into into a XMM register. Jump to not_numbers jump +// target passing the left and right result if the operand is not a number. +static void LoadComparisonOperandSSE2(MacroAssembler* masm_, + Result* operand, + XMMRegister xmm_reg, + Result* left_side, + Result* right_side, + JumpTarget* not_numbers) { + Label done; + if (operand->type_info().IsDouble()) { + // Operand is known to be a heap number, just load it. + __ movdbl(xmm_reg, FieldOperand(operand->reg(), HeapNumber::kValueOffset)); + } else if (operand->type_info().IsSmi()) { + // Operand is known to be a smi. Convert it to double and keep the original + // smi. + __ SmiUntag(operand->reg()); + __ cvtsi2sd(xmm_reg, Operand(operand->reg())); + __ SmiTag(operand->reg()); + } else { + // Operand type not known, check for smi or heap number. + Label smi; + __ test(operand->reg(), Immediate(kSmiTagMask)); + __ j(zero, &smi); + if (!operand->type_info().IsNumber()) { + __ cmp(FieldOperand(operand->reg(), HeapObject::kMapOffset), + Immediate(FACTORY->heap_number_map())); + not_numbers->Branch(not_equal, left_side, right_side, taken); + } + __ movdbl(xmm_reg, FieldOperand(operand->reg(), HeapNumber::kValueOffset)); + __ jmp(&done); + + __ bind(&smi); + // Comvert smi to float and keep the original smi. + __ SmiUntag(operand->reg()); + __ cvtsi2sd(xmm_reg, Operand(operand->reg())); + __ SmiTag(operand->reg()); + __ jmp(&done); + } + __ bind(&done); +} + + +void CodeGenerator::GenerateInlineNumberComparison(Result* left_side, + Result* right_side, + Condition cc, + ControlDestination* dest) { + ASSERT(left_side->is_register()); + ASSERT(right_side->is_register()); + + JumpTarget not_numbers; + if (CpuFeatures::IsSupported(SSE2)) { + CpuFeatures::Scope use_sse2(SSE2); + + // Load left and right operand into registers xmm0 and xmm1 and compare. + LoadComparisonOperandSSE2(masm_, left_side, xmm0, left_side, right_side, + ¬_numbers); + LoadComparisonOperandSSE2(masm_, right_side, xmm1, left_side, right_side, + ¬_numbers); + __ ucomisd(xmm0, xmm1); + } else { + Label check_right, compare; + + // Make sure that both comparison operands are numbers. + CheckComparisonOperand(masm_, left_side, left_side, right_side, + ¬_numbers); + CheckComparisonOperand(masm_, right_side, left_side, right_side, + ¬_numbers); + + // Load right and left operand to FPU stack and compare. + LoadComparisonOperand(masm_, right_side); + LoadComparisonOperand(masm_, left_side); + __ FCmp(); + } + + // Bail out if a NaN is involved. + not_numbers.Branch(parity_even, left_side, right_side, not_taken); + + // Split to destination targets based on comparison. + left_side->Unuse(); + right_side->Unuse(); + dest->true_target()->Branch(DoubleCondition(cc)); + dest->false_target()->Jump(); + + not_numbers.Bind(left_side, right_side); +} + + +// Call the function just below TOS on the stack with the given +// arguments. The receiver is the TOS. +void CodeGenerator::CallWithArguments(ZoneList<Expression*>* args, + CallFunctionFlags flags, + int position) { + // Push the arguments ("left-to-right") on the stack. + int arg_count = args->length(); + for (int i = 0; i < arg_count; i++) { + Load(args->at(i)); + frame_->SpillTop(); + } + + // Record the position for debugging purposes. + CodeForSourcePosition(position); + + // Use the shared code stub to call the function. + InLoopFlag in_loop = loop_nesting() > 0 ? IN_LOOP : NOT_IN_LOOP; + CallFunctionStub call_function(arg_count, in_loop, flags); + Result answer = frame_->CallStub(&call_function, arg_count + 1); + // Restore context and replace function on the stack with the + // result of the stub invocation. + frame_->RestoreContextRegister(); + frame_->SetElementAt(0, &answer); +} + + +void CodeGenerator::CallApplyLazy(Expression* applicand, + Expression* receiver, + VariableProxy* arguments, + int position) { + // An optimized implementation of expressions of the form + // x.apply(y, arguments). + // If the arguments object of the scope has not been allocated, + // and x.apply is Function.prototype.apply, this optimization + // just copies y and the arguments of the current function on the + // stack, as receiver and arguments, and calls x. + // In the implementation comments, we call x the applicand + // and y the receiver. + ASSERT(ArgumentsMode() == LAZY_ARGUMENTS_ALLOCATION); + ASSERT(arguments->IsArguments()); + + // Load applicand.apply onto the stack. This will usually + // give us a megamorphic load site. Not super, but it works. + Load(applicand); + frame()->Dup(); + Handle<String> name = FACTORY->LookupAsciiSymbol("apply"); + frame()->Push(name); + Result answer = frame()->CallLoadIC(RelocInfo::CODE_TARGET); + __ nop(); + frame()->Push(&answer); + + // Load the receiver and the existing arguments object onto the + // expression stack. Avoid allocating the arguments object here. + Load(receiver); + LoadFromSlot(scope()->arguments()->AsSlot(), NOT_INSIDE_TYPEOF); + + // Emit the source position information after having loaded the + // receiver and the arguments. + CodeForSourcePosition(position); + // Contents of frame at this point: + // Frame[0]: arguments object of the current function or the hole. + // Frame[1]: receiver + // Frame[2]: applicand.apply + // Frame[3]: applicand. + + // Check if the arguments object has been lazily allocated + // already. If so, just use that instead of copying the arguments + // from the stack. This also deals with cases where a local variable + // named 'arguments' has been introduced. + frame_->Dup(); + Result probe = frame_->Pop(); + { VirtualFrame::SpilledScope spilled_scope; + Label slow, done; + bool try_lazy = true; + if (probe.is_constant()) { + try_lazy = probe.handle()->IsArgumentsMarker(); + } else { + __ cmp(Operand(probe.reg()), Immediate(FACTORY->arguments_marker())); + probe.Unuse(); + __ j(not_equal, &slow); + } + + if (try_lazy) { + Label build_args; + // Get rid of the arguments object probe. + frame_->Drop(); // Can be called on a spilled frame. + // Stack now has 3 elements on it. + // Contents of stack at this point: + // esp[0]: receiver + // esp[1]: applicand.apply + // esp[2]: applicand. + + // Check that the receiver really is a JavaScript object. + __ mov(eax, Operand(esp, 0)); + __ test(eax, Immediate(kSmiTagMask)); + __ j(zero, &build_args); + // We allow all JSObjects including JSFunctions. As long as + // JS_FUNCTION_TYPE is the last instance type and it is right + // after LAST_JS_OBJECT_TYPE, we do not have to check the upper + // bound. + STATIC_ASSERT(LAST_TYPE == JS_FUNCTION_TYPE); + STATIC_ASSERT(JS_FUNCTION_TYPE == LAST_JS_OBJECT_TYPE + 1); + __ CmpObjectType(eax, FIRST_JS_OBJECT_TYPE, ecx); + __ j(below, &build_args); + + // Check that applicand.apply is Function.prototype.apply. + __ mov(eax, Operand(esp, kPointerSize)); + __ test(eax, Immediate(kSmiTagMask)); + __ j(zero, &build_args); + __ CmpObjectType(eax, JS_FUNCTION_TYPE, ecx); + __ j(not_equal, &build_args); + __ mov(ecx, FieldOperand(eax, JSFunction::kCodeEntryOffset)); + __ sub(Operand(ecx), Immediate(Code::kHeaderSize - kHeapObjectTag)); + Handle<Code> apply_code(masm()->isolate()->builtins()->builtin( + Builtins::kFunctionApply)); + __ cmp(Operand(ecx), Immediate(apply_code)); + __ j(not_equal, &build_args); + + // Check that applicand is a function. + __ mov(edi, Operand(esp, 2 * kPointerSize)); + __ test(edi, Immediate(kSmiTagMask)); + __ j(zero, &build_args); + __ CmpObjectType(edi, JS_FUNCTION_TYPE, ecx); + __ j(not_equal, &build_args); + + // Copy the arguments to this function possibly from the + // adaptor frame below it. + Label invoke, adapted; + __ mov(edx, Operand(ebp, StandardFrameConstants::kCallerFPOffset)); + __ mov(ecx, Operand(edx, StandardFrameConstants::kContextOffset)); + __ cmp(Operand(ecx), + Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR))); + __ j(equal, &adapted); + + // No arguments adaptor frame. Copy fixed number of arguments. + __ mov(eax, Immediate(scope()->num_parameters())); + for (int i = 0; i < scope()->num_parameters(); i++) { + __ push(frame_->ParameterAt(i)); + } + __ jmp(&invoke); + + // Arguments adaptor frame present. Copy arguments from there, but + // avoid copying too many arguments to avoid stack overflows. + __ bind(&adapted); + static const uint32_t kArgumentsLimit = 1 * KB; + __ mov(eax, Operand(edx, ArgumentsAdaptorFrameConstants::kLengthOffset)); + __ SmiUntag(eax); + __ mov(ecx, Operand(eax)); + __ cmp(eax, kArgumentsLimit); + __ j(above, &build_args); + + // Loop through the arguments pushing them onto the execution + // stack. We don't inform the virtual frame of the push, so we don't + // have to worry about getting rid of the elements from the virtual + // frame. + Label loop; + // ecx is a small non-negative integer, due to the test above. + __ test(ecx, Operand(ecx)); + __ j(zero, &invoke); + __ bind(&loop); + __ push(Operand(edx, ecx, times_pointer_size, 1 * kPointerSize)); + __ dec(ecx); + __ j(not_zero, &loop); + + // Invoke the function. + __ bind(&invoke); + ParameterCount actual(eax); + __ InvokeFunction(edi, actual, CALL_FUNCTION); + // Drop applicand.apply and applicand from the stack, and push + // the result of the function call, but leave the spilled frame + // unchanged, with 3 elements, so it is correct when we compile the + // slow-case code. + __ add(Operand(esp), Immediate(2 * kPointerSize)); + __ push(eax); + // Stack now has 1 element: + // esp[0]: result + __ jmp(&done); + + // Slow-case: Allocate the arguments object since we know it isn't + // there, and fall-through to the slow-case where we call + // applicand.apply. + __ bind(&build_args); + // Stack now has 3 elements, because we have jumped from where: + // esp[0]: receiver + // esp[1]: applicand.apply + // esp[2]: applicand. + + // StoreArgumentsObject requires a correct frame, and may modify it. + Result arguments_object = StoreArgumentsObject(false); + frame_->SpillAll(); + arguments_object.ToRegister(); + frame_->EmitPush(arguments_object.reg()); + arguments_object.Unuse(); + // Stack and frame now have 4 elements. + __ bind(&slow); + } + + // Generic computation of x.apply(y, args) with no special optimization. + // Flip applicand.apply and applicand on the stack, so + // applicand looks like the receiver of the applicand.apply call. + // Then process it as a normal function call. + __ mov(eax, Operand(esp, 3 * kPointerSize)); + __ mov(ebx, Operand(esp, 2 * kPointerSize)); + __ mov(Operand(esp, 2 * kPointerSize), eax); + __ mov(Operand(esp, 3 * kPointerSize), ebx); + + CallFunctionStub call_function(2, NOT_IN_LOOP, NO_CALL_FUNCTION_FLAGS); + Result res = frame_->CallStub(&call_function, 3); + // The function and its two arguments have been dropped. + frame_->Drop(1); // Drop the receiver as well. + res.ToRegister(); + frame_->EmitPush(res.reg()); + // Stack now has 1 element: + // esp[0]: result + if (try_lazy) __ bind(&done); + } // End of spilled scope. + // Restore the context register after a call. + frame_->RestoreContextRegister(); +} + + +class DeferredStackCheck: public DeferredCode { + public: + DeferredStackCheck() { + set_comment("[ DeferredStackCheck"); + } + + virtual void Generate(); +}; + + +void DeferredStackCheck::Generate() { + StackCheckStub stub; + __ CallStub(&stub); +} + + +void CodeGenerator::CheckStack() { + DeferredStackCheck* deferred = new DeferredStackCheck; + ExternalReference stack_limit = + ExternalReference::address_of_stack_limit(masm()->isolate()); + __ cmp(esp, Operand::StaticVariable(stack_limit)); + deferred->Branch(below); + deferred->BindExit(); +} + + +void CodeGenerator::VisitAndSpill(Statement* statement) { + ASSERT(in_spilled_code()); + set_in_spilled_code(false); + Visit(statement); + if (frame_ != NULL) { + frame_->SpillAll(); + } + set_in_spilled_code(true); +} + + +void CodeGenerator::VisitStatementsAndSpill(ZoneList<Statement*>* statements) { +#ifdef DEBUG + int original_height = frame_->height(); +#endif + ASSERT(in_spilled_code()); + set_in_spilled_code(false); + VisitStatements(statements); + if (frame_ != NULL) { + frame_->SpillAll(); + } + set_in_spilled_code(true); + + ASSERT(!has_valid_frame() || frame_->height() == original_height); +} + + +void CodeGenerator::VisitStatements(ZoneList<Statement*>* statements) { +#ifdef DEBUG + int original_height = frame_->height(); +#endif + ASSERT(!in_spilled_code()); + for (int i = 0; has_valid_frame() && i < statements->length(); i++) { + Visit(statements->at(i)); + } + ASSERT(!has_valid_frame() || frame_->height() == original_height); +} + + +void CodeGenerator::VisitBlock(Block* node) { + ASSERT(!in_spilled_code()); + Comment cmnt(masm_, "[ Block"); + CodeForStatementPosition(node); + node->break_target()->set_direction(JumpTarget::FORWARD_ONLY); + VisitStatements(node->statements()); + if (node->break_target()->is_linked()) { + node->break_target()->Bind(); + } + node->break_target()->Unuse(); +} + + +void CodeGenerator::DeclareGlobals(Handle<FixedArray> pairs) { + // Call the runtime to declare the globals. The inevitable call + // will sync frame elements to memory anyway, so we do it eagerly to + // allow us to push the arguments directly into place. + frame_->SyncRange(0, frame_->element_count() - 1); + + frame_->EmitPush(esi); // The context is the first argument. + frame_->EmitPush(Immediate(pairs)); + frame_->EmitPush(Immediate(Smi::FromInt(is_eval() ? 1 : 0))); + frame_->EmitPush(Immediate(Smi::FromInt(strict_mode_flag()))); + Result ignored = frame_->CallRuntime(Runtime::kDeclareGlobals, 4); + // Return value is ignored. +} + + +void CodeGenerator::VisitDeclaration(Declaration* node) { + Comment cmnt(masm_, "[ Declaration"); + Variable* var = node->proxy()->var(); + ASSERT(var != NULL); // must have been resolved + Slot* slot = var->AsSlot(); + + // If it was not possible to allocate the variable at compile time, + // we need to "declare" it at runtime to make sure it actually + // exists in the local context. + if (slot != NULL && slot->type() == Slot::LOOKUP) { + // Variables with a "LOOKUP" slot were introduced as non-locals + // during variable resolution and must have mode DYNAMIC. + ASSERT(var->is_dynamic()); + // For now, just do a runtime call. Sync the virtual frame eagerly + // so we can simply push the arguments into place. + frame_->SyncRange(0, frame_->element_count() - 1); + frame_->EmitPush(esi); + frame_->EmitPush(Immediate(var->name())); + // Declaration nodes are always introduced in one of two modes. + ASSERT(node->mode() == Variable::VAR || node->mode() == Variable::CONST); + PropertyAttributes attr = node->mode() == Variable::VAR ? NONE : READ_ONLY; + frame_->EmitPush(Immediate(Smi::FromInt(attr))); + // Push initial value, if any. + // Note: For variables we must not push an initial value (such as + // 'undefined') because we may have a (legal) redeclaration and we + // must not destroy the current value. + if (node->mode() == Variable::CONST) { + frame_->EmitPush(Immediate(FACTORY->the_hole_value())); + } else if (node->fun() != NULL) { + Load(node->fun()); + } else { + frame_->EmitPush(Immediate(Smi::FromInt(0))); // no initial value! + } + Result ignored = frame_->CallRuntime(Runtime::kDeclareContextSlot, 4); + // Ignore the return value (declarations are statements). + return; + } + + ASSERT(!var->is_global()); + + // If we have a function or a constant, we need to initialize the variable. + Expression* val = NULL; + if (node->mode() == Variable::CONST) { + val = new Literal(FACTORY->the_hole_value()); + } else { + val = node->fun(); // NULL if we don't have a function + } + + if (val != NULL) { + { + // Set the initial value. + Reference target(this, node->proxy()); + Load(val); + target.SetValue(NOT_CONST_INIT); + // The reference is removed from the stack (preserving TOS) when + // it goes out of scope. + } + // Get rid of the assigned value (declarations are statements). + frame_->Drop(); + } +} + + +void CodeGenerator::VisitExpressionStatement(ExpressionStatement* node) { + ASSERT(!in_spilled_code()); + Comment cmnt(masm_, "[ ExpressionStatement"); + CodeForStatementPosition(node); + Expression* expression = node->expression(); + expression->MarkAsStatement(); + Load(expression); + // Remove the lingering expression result from the top of stack. + frame_->Drop(); +} + + +void CodeGenerator::VisitEmptyStatement(EmptyStatement* node) { + ASSERT(!in_spilled_code()); + Comment cmnt(masm_, "// EmptyStatement"); + CodeForStatementPosition(node); + // nothing to do +} + + +void CodeGenerator::VisitIfStatement(IfStatement* node) { + ASSERT(!in_spilled_code()); + Comment cmnt(masm_, "[ IfStatement"); + // Generate different code depending on which parts of the if statement + // are present or not. + bool has_then_stm = node->HasThenStatement(); + bool has_else_stm = node->HasElseStatement(); + + CodeForStatementPosition(node); + JumpTarget exit; + if (has_then_stm && has_else_stm) { + JumpTarget then; + JumpTarget else_; + ControlDestination dest(&then, &else_, true); + LoadCondition(node->condition(), &dest, true); + + if (dest.false_was_fall_through()) { + // The else target was bound, so we compile the else part first. + Visit(node->else_statement()); + + // We may have dangling jumps to the then part. + if (then.is_linked()) { + if (has_valid_frame()) exit.Jump(); + then.Bind(); + Visit(node->then_statement()); + } + } else { + // The then target was bound, so we compile the then part first. + Visit(node->then_statement()); + + if (else_.is_linked()) { + if (has_valid_frame()) exit.Jump(); + else_.Bind(); + Visit(node->else_statement()); + } + } + + } else if (has_then_stm) { + ASSERT(!has_else_stm); + JumpTarget then; + ControlDestination dest(&then, &exit, true); + LoadCondition(node->condition(), &dest, true); + + if (dest.false_was_fall_through()) { + // The exit label was bound. We may have dangling jumps to the + // then part. + if (then.is_linked()) { + exit.Unuse(); + exit.Jump(); + then.Bind(); + Visit(node->then_statement()); + } + } else { + // The then label was bound. + Visit(node->then_statement()); + } + + } else if (has_else_stm) { + ASSERT(!has_then_stm); + JumpTarget else_; + ControlDestination dest(&exit, &else_, false); + LoadCondition(node->condition(), &dest, true); + + if (dest.true_was_fall_through()) { + // The exit label was bound. We may have dangling jumps to the + // else part. + if (else_.is_linked()) { + exit.Unuse(); + exit.Jump(); + else_.Bind(); + Visit(node->else_statement()); + } + } else { + // The else label was bound. + Visit(node->else_statement()); + } + + } else { + ASSERT(!has_then_stm && !has_else_stm); + // We only care about the condition's side effects (not its value + // or control flow effect). LoadCondition is called without + // forcing control flow. + ControlDestination dest(&exit, &exit, true); + LoadCondition(node->condition(), &dest, false); + if (!dest.is_used()) { + // We got a value on the frame rather than (or in addition to) + // control flow. + frame_->Drop(); + } + } + + if (exit.is_linked()) { + exit.Bind(); + } +} + + +void CodeGenerator::VisitContinueStatement(ContinueStatement* node) { + ASSERT(!in_spilled_code()); + Comment cmnt(masm_, "[ ContinueStatement"); + CodeForStatementPosition(node); + node->target()->continue_target()->Jump(); +} + + +void CodeGenerator::VisitBreakStatement(BreakStatement* node) { + ASSERT(!in_spilled_code()); + Comment cmnt(masm_, "[ BreakStatement"); + CodeForStatementPosition(node); + node->target()->break_target()->Jump(); +} + + +void CodeGenerator::VisitReturnStatement(ReturnStatement* node) { + ASSERT(!in_spilled_code()); + Comment cmnt(masm_, "[ ReturnStatement"); + + CodeForStatementPosition(node); + Load(node->expression()); + Result return_value = frame_->Pop(); + masm()->positions_recorder()->WriteRecordedPositions(); + if (function_return_is_shadowed_) { + function_return_.Jump(&return_value); + } else { + frame_->PrepareForReturn(); + if (function_return_.is_bound()) { + // If the function return label is already bound we reuse the + // code by jumping to the return site. + function_return_.Jump(&return_value); + } else { + function_return_.Bind(&return_value); + GenerateReturnSequence(&return_value); + } + } +} + + +void CodeGenerator::GenerateReturnSequence(Result* return_value) { + // The return value is a live (but not currently reference counted) + // reference to eax. This is safe because the current frame does not + // contain a reference to eax (it is prepared for the return by spilling + // all registers). + if (FLAG_trace) { + frame_->Push(return_value); + *return_value = frame_->CallRuntime(Runtime::kTraceExit, 1); + } + return_value->ToRegister(eax); + + // Add a label for checking the size of the code used for returning. +#ifdef DEBUG + Label check_exit_codesize; + masm_->bind(&check_exit_codesize); +#endif + + // Leave the frame and return popping the arguments and the + // receiver. + frame_->Exit(); + int arguments_bytes = (scope()->num_parameters() + 1) * kPointerSize; + __ Ret(arguments_bytes, ecx); + DeleteFrame(); + +#ifdef ENABLE_DEBUGGER_SUPPORT + // Check that the size of the code used for returning is large enough + // for the debugger's requirements. + ASSERT(Assembler::kJSReturnSequenceLength <= + masm_->SizeOfCodeGeneratedSince(&check_exit_codesize)); +#endif +} + + +void CodeGenerator::VisitWithEnterStatement(WithEnterStatement* node) { + ASSERT(!in_spilled_code()); + Comment cmnt(masm_, "[ WithEnterStatement"); + CodeForStatementPosition(node); + Load(node->expression()); + Result context; + if (node->is_catch_block()) { + context = frame_->CallRuntime(Runtime::kPushCatchContext, 1); + } else { + context = frame_->CallRuntime(Runtime::kPushContext, 1); + } + + // Update context local. + frame_->SaveContextRegister(); + + // Verify that the runtime call result and esi agree. + if (FLAG_debug_code) { + __ cmp(context.reg(), Operand(esi)); + __ Assert(equal, "Runtime::NewContext should end up in esi"); + } +} + + +void CodeGenerator::VisitWithExitStatement(WithExitStatement* node) { + ASSERT(!in_spilled_code()); + Comment cmnt(masm_, "[ WithExitStatement"); + CodeForStatementPosition(node); + // Pop context. + __ mov(esi, ContextOperand(esi, Context::PREVIOUS_INDEX)); + // Update context local. + frame_->SaveContextRegister(); +} + + +void CodeGenerator::VisitSwitchStatement(SwitchStatement* node) { + ASSERT(!in_spilled_code()); + Comment cmnt(masm_, "[ SwitchStatement"); + CodeForStatementPosition(node); + node->break_target()->set_direction(JumpTarget::FORWARD_ONLY); + + // Compile the switch value. + Load(node->tag()); + + ZoneList<CaseClause*>* cases = node->cases(); + int length = cases->length(); + CaseClause* default_clause = NULL; + + JumpTarget next_test; + // Compile the case label expressions and comparisons. Exit early + // if a comparison is unconditionally true. The target next_test is + // bound before the loop in order to indicate control flow to the + // first comparison. + next_test.Bind(); + for (int i = 0; i < length && !next_test.is_unused(); i++) { + CaseClause* clause = cases->at(i); + // The default is not a test, but remember it for later. + if (clause->is_default()) { + default_clause = clause; + continue; + } + + Comment cmnt(masm_, "[ Case comparison"); + // We recycle the same target next_test for each test. Bind it if + // the previous test has not done so and then unuse it for the + // loop. + if (next_test.is_linked()) { + next_test.Bind(); + } + next_test.Unuse(); + + // Duplicate the switch value. + frame_->Dup(); + + // Compile the label expression. + Load(clause->label()); + + // Compare and branch to the body if true or the next test if + // false. Prefer the next test as a fall through. + ControlDestination dest(clause->body_target(), &next_test, false); + Comparison(node, equal, true, &dest); + + // If the comparison fell through to the true target, jump to the + // actual body. + if (dest.true_was_fall_through()) { + clause->body_target()->Unuse(); + clause->body_target()->Jump(); + } + } + + // If there was control flow to a next test from the last one + // compiled, compile a jump to the default or break target. + if (!next_test.is_unused()) { + if (next_test.is_linked()) { + next_test.Bind(); + } + // Drop the switch value. + frame_->Drop(); + if (default_clause != NULL) { + default_clause->body_target()->Jump(); + } else { + node->break_target()->Jump(); + } + } + + // The last instruction emitted was a jump, either to the default + // clause or the break target, or else to a case body from the loop + // that compiles the tests. + ASSERT(!has_valid_frame()); + // Compile case bodies as needed. + for (int i = 0; i < length; i++) { + CaseClause* clause = cases->at(i); + + // There are two ways to reach the body: from the corresponding + // test or as the fall through of the previous body. + if (clause->body_target()->is_linked() || has_valid_frame()) { + if (clause->body_target()->is_linked()) { + if (has_valid_frame()) { + // If we have both a jump to the test and a fall through, put + // a jump on the fall through path to avoid the dropping of + // the switch value on the test path. The exception is the + // default which has already had the switch value dropped. + if (clause->is_default()) { + clause->body_target()->Bind(); + } else { + JumpTarget body; + body.Jump(); + clause->body_target()->Bind(); + frame_->Drop(); + body.Bind(); + } + } else { + // No fall through to worry about. + clause->body_target()->Bind(); + if (!clause->is_default()) { + frame_->Drop(); + } + } + } else { + // Otherwise, we have only fall through. + ASSERT(has_valid_frame()); + } + + // We are now prepared to compile the body. + Comment cmnt(masm_, "[ Case body"); + VisitStatements(clause->statements()); + } + clause->body_target()->Unuse(); + } + + // We may not have a valid frame here so bind the break target only + // if needed. + if (node->break_target()->is_linked()) { + node->break_target()->Bind(); + } + node->break_target()->Unuse(); +} + + +void CodeGenerator::VisitDoWhileStatement(DoWhileStatement* node) { + ASSERT(!in_spilled_code()); + Comment cmnt(masm_, "[ DoWhileStatement"); + CodeForStatementPosition(node); + node->break_target()->set_direction(JumpTarget::FORWARD_ONLY); + JumpTarget body(JumpTarget::BIDIRECTIONAL); + IncrementLoopNesting(); + + ConditionAnalysis info = AnalyzeCondition(node->cond()); + // Label the top of the loop for the backward jump if necessary. + switch (info) { + case ALWAYS_TRUE: + // Use the continue target. + node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL); + node->continue_target()->Bind(); + break; + case ALWAYS_FALSE: + // No need to label it. + node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY); + break; + case DONT_KNOW: + // Continue is the test, so use the backward body target. + node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY); + body.Bind(); + break; + } + + CheckStack(); // TODO(1222600): ignore if body contains calls. + Visit(node->body()); + + // Compile the test. + switch (info) { + case ALWAYS_TRUE: + // If control flow can fall off the end of the body, jump back + // to the top and bind the break target at the exit. + if (has_valid_frame()) { + node->continue_target()->Jump(); + } + if (node->break_target()->is_linked()) { + node->break_target()->Bind(); + } + break; + case ALWAYS_FALSE: + // We may have had continues or breaks in the body. + if (node->continue_target()->is_linked()) { + node->continue_target()->Bind(); + } + if (node->break_target()->is_linked()) { + node->break_target()->Bind(); + } + break; + case DONT_KNOW: + // We have to compile the test expression if it can be reached by + // control flow falling out of the body or via continue. + if (node->continue_target()->is_linked()) { + node->continue_target()->Bind(); + } + if (has_valid_frame()) { + Comment cmnt(masm_, "[ DoWhileCondition"); + CodeForDoWhileConditionPosition(node); + ControlDestination dest(&body, node->break_target(), false); + LoadCondition(node->cond(), &dest, true); + } + if (node->break_target()->is_linked()) { + node->break_target()->Bind(); + } + break; + } + + DecrementLoopNesting(); + node->continue_target()->Unuse(); + node->break_target()->Unuse(); +} + + +void CodeGenerator::VisitWhileStatement(WhileStatement* node) { + ASSERT(!in_spilled_code()); + Comment cmnt(masm_, "[ WhileStatement"); + CodeForStatementPosition(node); + + // If the condition is always false and has no side effects, we do not + // need to compile anything. + ConditionAnalysis info = AnalyzeCondition(node->cond()); + if (info == ALWAYS_FALSE) return; + + // Do not duplicate conditions that may have function literal + // subexpressions. This can cause us to compile the function literal + // twice. + bool test_at_bottom = !node->may_have_function_literal(); + node->break_target()->set_direction(JumpTarget::FORWARD_ONLY); + IncrementLoopNesting(); + JumpTarget body; + if (test_at_bottom) { + body.set_direction(JumpTarget::BIDIRECTIONAL); + } + + // Based on the condition analysis, compile the test as necessary. + switch (info) { + case ALWAYS_TRUE: + // We will not compile the test expression. Label the top of the + // loop with the continue target. + node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL); + node->continue_target()->Bind(); + break; + case DONT_KNOW: { + if (test_at_bottom) { + // Continue is the test at the bottom, no need to label the test + // at the top. The body is a backward target. + node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY); + } else { + // Label the test at the top as the continue target. The body + // is a forward-only target. + node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL); + node->continue_target()->Bind(); + } + // Compile the test with the body as the true target and preferred + // fall-through and with the break target as the false target. + ControlDestination dest(&body, node->break_target(), true); + LoadCondition(node->cond(), &dest, true); + + if (dest.false_was_fall_through()) { + // If we got the break target as fall-through, the test may have + // been unconditionally false (if there are no jumps to the + // body). + if (!body.is_linked()) { + DecrementLoopNesting(); + return; + } + + // Otherwise, jump around the body on the fall through and then + // bind the body target. + node->break_target()->Unuse(); + node->break_target()->Jump(); + body.Bind(); + } + break; + } + case ALWAYS_FALSE: + UNREACHABLE(); + break; + } + + CheckStack(); // TODO(1222600): ignore if body contains calls. + Visit(node->body()); + + // Based on the condition analysis, compile the backward jump as + // necessary. + switch (info) { + case ALWAYS_TRUE: + // The loop body has been labeled with the continue target. + if (has_valid_frame()) { + node->continue_target()->Jump(); + } + break; + case DONT_KNOW: + if (test_at_bottom) { + // If we have chosen to recompile the test at the bottom, + // then it is the continue target. + if (node->continue_target()->is_linked()) { + node->continue_target()->Bind(); + } + if (has_valid_frame()) { + // The break target is the fall-through (body is a backward + // jump from here and thus an invalid fall-through). + ControlDestination dest(&body, node->break_target(), false); + LoadCondition(node->cond(), &dest, true); + } + } else { + // If we have chosen not to recompile the test at the bottom, + // jump back to the one at the top. + if (has_valid_frame()) { + node->continue_target()->Jump(); + } + } + break; + case ALWAYS_FALSE: + UNREACHABLE(); + break; + } + + // The break target may be already bound (by the condition), or there + // may not be a valid frame. Bind it only if needed. + if (node->break_target()->is_linked()) { + node->break_target()->Bind(); + } + DecrementLoopNesting(); +} + + +void CodeGenerator::SetTypeForStackSlot(Slot* slot, TypeInfo info) { + ASSERT(slot->type() == Slot::LOCAL || slot->type() == Slot::PARAMETER); + if (slot->type() == Slot::LOCAL) { + frame_->SetTypeForLocalAt(slot->index(), info); + } else { + frame_->SetTypeForParamAt(slot->index(), info); + } + if (FLAG_debug_code && info.IsSmi()) { + if (slot->type() == Slot::LOCAL) { + frame_->PushLocalAt(slot->index()); + } else { + frame_->PushParameterAt(slot->index()); + } + Result var = frame_->Pop(); + var.ToRegister(); + __ AbortIfNotSmi(var.reg()); + } +} + + +void CodeGenerator::VisitForStatement(ForStatement* node) { + ASSERT(!in_spilled_code()); + Comment cmnt(masm_, "[ ForStatement"); + CodeForStatementPosition(node); + + // Compile the init expression if present. + if (node->init() != NULL) { + Visit(node->init()); + } + + // If the condition is always false and has no side effects, we do not + // need to compile anything else. + ConditionAnalysis info = AnalyzeCondition(node->cond()); + if (info == ALWAYS_FALSE) return; + + // Do not duplicate conditions that may have function literal + // subexpressions. This can cause us to compile the function literal + // twice. + bool test_at_bottom = !node->may_have_function_literal(); + node->break_target()->set_direction(JumpTarget::FORWARD_ONLY); + IncrementLoopNesting(); + + // Target for backward edge if no test at the bottom, otherwise + // unused. + JumpTarget loop(JumpTarget::BIDIRECTIONAL); + + // Target for backward edge if there is a test at the bottom, + // otherwise used as target for test at the top. + JumpTarget body; + if (test_at_bottom) { + body.set_direction(JumpTarget::BIDIRECTIONAL); + } + + // Based on the condition analysis, compile the test as necessary. + switch (info) { + case ALWAYS_TRUE: + // We will not compile the test expression. Label the top of the + // loop. + if (node->next() == NULL) { + // Use the continue target if there is no update expression. + node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL); + node->continue_target()->Bind(); + } else { + // Otherwise use the backward loop target. + node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY); + loop.Bind(); + } + break; + case DONT_KNOW: { + if (test_at_bottom) { + // Continue is either the update expression or the test at the + // bottom, no need to label the test at the top. + node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY); + } else if (node->next() == NULL) { + // We are not recompiling the test at the bottom and there is no + // update expression. + node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL); + node->continue_target()->Bind(); + } else { + // We are not recompiling the test at the bottom and there is an + // update expression. + node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY); + loop.Bind(); + } + + // Compile the test with the body as the true target and preferred + // fall-through and with the break target as the false target. + ControlDestination dest(&body, node->break_target(), true); + LoadCondition(node->cond(), &dest, true); + + if (dest.false_was_fall_through()) { + // If we got the break target as fall-through, the test may have + // been unconditionally false (if there are no jumps to the + // body). + if (!body.is_linked()) { + DecrementLoopNesting(); + return; + } + + // Otherwise, jump around the body on the fall through and then + // bind the body target. + node->break_target()->Unuse(); + node->break_target()->Jump(); + body.Bind(); + } + break; + } + case ALWAYS_FALSE: + UNREACHABLE(); + break; + } + + CheckStack(); // TODO(1222600): ignore if body contains calls. + + // We know that the loop index is a smi if it is not modified in the + // loop body and it is checked against a constant limit in the loop + // condition. In this case, we reset the static type information of the + // loop index to smi before compiling the body, the update expression, and + // the bottom check of the loop condition. + if (node->is_fast_smi_loop()) { + // Set number type of the loop variable to smi. + SetTypeForStackSlot(node->loop_variable()->AsSlot(), TypeInfo::Smi()); + } + + Visit(node->body()); + + // If there is an update expression, compile it if necessary. + if (node->next() != NULL) { + if (node->continue_target()->is_linked()) { + node->continue_target()->Bind(); + } + + // Control can reach the update by falling out of the body or by a + // continue. + if (has_valid_frame()) { + // Record the source position of the statement as this code which + // is after the code for the body actually belongs to the loop + // statement and not the body. + CodeForStatementPosition(node); + Visit(node->next()); + } + } + + // Set the type of the loop variable to smi before compiling the test + // expression if we are in a fast smi loop condition. + if (node->is_fast_smi_loop() && has_valid_frame()) { + // Set number type of the loop variable to smi. + SetTypeForStackSlot(node->loop_variable()->AsSlot(), TypeInfo::Smi()); + } + + // Based on the condition analysis, compile the backward jump as + // necessary. + switch (info) { + case ALWAYS_TRUE: + if (has_valid_frame()) { + if (node->next() == NULL) { + node->continue_target()->Jump(); + } else { + loop.Jump(); + } + } + break; + case DONT_KNOW: + if (test_at_bottom) { + if (node->continue_target()->is_linked()) { + // We can have dangling jumps to the continue target if there + // was no update expression. + node->continue_target()->Bind(); + } + // Control can reach the test at the bottom by falling out of + // the body, by a continue in the body, or from the update + // expression. + if (has_valid_frame()) { + // The break target is the fall-through (body is a backward + // jump from here). + ControlDestination dest(&body, node->break_target(), false); + LoadCondition(node->cond(), &dest, true); + } + } else { + // Otherwise, jump back to the test at the top. + if (has_valid_frame()) { + if (node->next() == NULL) { + node->continue_target()->Jump(); + } else { + loop.Jump(); + } + } + } + break; + case ALWAYS_FALSE: + UNREACHABLE(); + break; + } + + // The break target may be already bound (by the condition), or there + // may not be a valid frame. Bind it only if needed. + if (node->break_target()->is_linked()) { + node->break_target()->Bind(); + } + DecrementLoopNesting(); +} + + +void CodeGenerator::VisitForInStatement(ForInStatement* node) { + ASSERT(!in_spilled_code()); + VirtualFrame::SpilledScope spilled_scope; + Comment cmnt(masm_, "[ ForInStatement"); + CodeForStatementPosition(node); + + JumpTarget primitive; + JumpTarget jsobject; + JumpTarget fixed_array; + JumpTarget entry(JumpTarget::BIDIRECTIONAL); + JumpTarget end_del_check; + JumpTarget exit; + + // Get the object to enumerate over (converted to JSObject). + LoadAndSpill(node->enumerable()); + + // Both SpiderMonkey and kjs ignore null and undefined in contrast + // to the specification. 12.6.4 mandates a call to ToObject. + frame_->EmitPop(eax); + + // eax: value to be iterated over + __ cmp(eax, FACTORY->undefined_value()); + exit.Branch(equal); + __ cmp(eax, FACTORY->null_value()); + exit.Branch(equal); + + // Stack layout in body: + // [iteration counter (smi)] <- slot 0 + // [length of array] <- slot 1 + // [FixedArray] <- slot 2 + // [Map or 0] <- slot 3 + // [Object] <- slot 4 + + // Check if enumerable is already a JSObject + // eax: value to be iterated over + __ test(eax, Immediate(kSmiTagMask)); + primitive.Branch(zero); + __ CmpObjectType(eax, FIRST_JS_OBJECT_TYPE, ecx); + jsobject.Branch(above_equal); + + primitive.Bind(); + frame_->EmitPush(eax); + frame_->InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION, 1); + // function call returns the value in eax, which is where we want it below + + jsobject.Bind(); + // Get the set of properties (as a FixedArray or Map). + // eax: value to be iterated over + frame_->EmitPush(eax); // Push the object being iterated over. + + // Check cache validity in generated code. This is a fast case for + // the JSObject::IsSimpleEnum cache validity checks. If we cannot + // guarantee cache validity, call the runtime system to check cache + // validity or get the property names in a fixed array. + JumpTarget call_runtime; + JumpTarget loop(JumpTarget::BIDIRECTIONAL); + JumpTarget check_prototype; + JumpTarget use_cache; + __ mov(ecx, eax); + loop.Bind(); + // Check that there are no elements. + __ mov(edx, FieldOperand(ecx, JSObject::kElementsOffset)); + __ cmp(Operand(edx), Immediate(FACTORY->empty_fixed_array())); + call_runtime.Branch(not_equal); + // Check that instance descriptors are not empty so that we can + // check for an enum cache. Leave the map in ebx for the subsequent + // prototype load. + __ mov(ebx, FieldOperand(ecx, HeapObject::kMapOffset)); + __ mov(edx, FieldOperand(ebx, Map::kInstanceDescriptorsOffset)); + __ cmp(Operand(edx), Immediate(FACTORY->empty_descriptor_array())); + call_runtime.Branch(equal); + // Check that there in an enum cache in the non-empty instance + // descriptors. This is the case if the next enumeration index + // field does not contain a smi. + __ mov(edx, FieldOperand(edx, DescriptorArray::kEnumerationIndexOffset)); + __ test(edx, Immediate(kSmiTagMask)); + call_runtime.Branch(zero); + // For all objects but the receiver, check that the cache is empty. + __ cmp(ecx, Operand(eax)); + check_prototype.Branch(equal); + __ mov(edx, FieldOperand(edx, DescriptorArray::kEnumCacheBridgeCacheOffset)); + __ cmp(Operand(edx), Immediate(FACTORY->empty_fixed_array())); + call_runtime.Branch(not_equal); + check_prototype.Bind(); + // Load the prototype from the map and loop if non-null. + __ mov(ecx, FieldOperand(ebx, Map::kPrototypeOffset)); + __ cmp(Operand(ecx), Immediate(FACTORY->null_value())); + loop.Branch(not_equal); + // The enum cache is valid. Load the map of the object being + // iterated over and use the cache for the iteration. + __ mov(eax, FieldOperand(eax, HeapObject::kMapOffset)); + use_cache.Jump(); + + call_runtime.Bind(); + // Call the runtime to get the property names for the object. + frame_->EmitPush(eax); // push the Object (slot 4) for the runtime call + frame_->CallRuntime(Runtime::kGetPropertyNamesFast, 1); + + // If we got a map from the runtime call, we can do a fast + // modification check. Otherwise, we got a fixed array, and we have + // to do a slow check. + // eax: map or fixed array (result from call to + // Runtime::kGetPropertyNamesFast) + __ mov(edx, Operand(eax)); + __ mov(ecx, FieldOperand(edx, HeapObject::kMapOffset)); + __ cmp(ecx, FACTORY->meta_map()); + fixed_array.Branch(not_equal); + + use_cache.Bind(); + // Get enum cache + // eax: map (either the result from a call to + // Runtime::kGetPropertyNamesFast or has been fetched directly from + // the object) + __ mov(ecx, Operand(eax)); + + __ mov(ecx, FieldOperand(ecx, Map::kInstanceDescriptorsOffset)); + // Get the bridge array held in the enumeration index field. + __ mov(ecx, FieldOperand(ecx, DescriptorArray::kEnumerationIndexOffset)); + // Get the cache from the bridge array. + __ mov(edx, FieldOperand(ecx, DescriptorArray::kEnumCacheBridgeCacheOffset)); + + frame_->EmitPush(eax); // <- slot 3 + frame_->EmitPush(edx); // <- slot 2 + __ mov(eax, FieldOperand(edx, FixedArray::kLengthOffset)); + frame_->EmitPush(eax); // <- slot 1 + frame_->EmitPush(Immediate(Smi::FromInt(0))); // <- slot 0 + entry.Jump(); + + fixed_array.Bind(); + // eax: fixed array (result from call to Runtime::kGetPropertyNamesFast) + frame_->EmitPush(Immediate(Smi::FromInt(0))); // <- slot 3 + frame_->EmitPush(eax); // <- slot 2 + + // Push the length of the array and the initial index onto the stack. + __ mov(eax, FieldOperand(eax, FixedArray::kLengthOffset)); + frame_->EmitPush(eax); // <- slot 1 + frame_->EmitPush(Immediate(Smi::FromInt(0))); // <- slot 0 + + // Condition. + entry.Bind(); + // Grab the current frame's height for the break and continue + // targets only after all the state is pushed on the frame. + node->break_target()->set_direction(JumpTarget::FORWARD_ONLY); + node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY); + + __ mov(eax, frame_->ElementAt(0)); // load the current count + __ cmp(eax, frame_->ElementAt(1)); // compare to the array length + node->break_target()->Branch(above_equal); + + // Get the i'th entry of the array. + __ mov(edx, frame_->ElementAt(2)); + __ mov(ebx, FixedArrayElementOperand(edx, eax)); + + // Get the expected map from the stack or a zero map in the + // permanent slow case eax: current iteration count ebx: i'th entry + // of the enum cache + __ mov(edx, frame_->ElementAt(3)); + // Check if the expected map still matches that of the enumerable. + // If not, we have to filter the key. + // eax: current iteration count + // ebx: i'th entry of the enum cache + // edx: expected map value + __ mov(ecx, frame_->ElementAt(4)); + __ mov(ecx, FieldOperand(ecx, HeapObject::kMapOffset)); + __ cmp(ecx, Operand(edx)); + end_del_check.Branch(equal); + + // Convert the entry to a string (or null if it isn't a property anymore). + frame_->EmitPush(frame_->ElementAt(4)); // push enumerable + frame_->EmitPush(ebx); // push entry + frame_->InvokeBuiltin(Builtins::FILTER_KEY, CALL_FUNCTION, 2); + __ mov(ebx, Operand(eax)); + + // If the property has been removed while iterating, we just skip it. + __ test(ebx, Operand(ebx)); + node->continue_target()->Branch(equal); + + end_del_check.Bind(); + // Store the entry in the 'each' expression and take another spin in the + // loop. edx: i'th entry of the enum cache (or string there of) + frame_->EmitPush(ebx); + { Reference each(this, node->each()); + if (!each.is_illegal()) { + if (each.size() > 0) { + // Loading a reference may leave the frame in an unspilled state. + frame_->SpillAll(); + // Get the value (under the reference on the stack) from memory. + frame_->EmitPush(frame_->ElementAt(each.size())); + each.SetValue(NOT_CONST_INIT); + frame_->Drop(2); + } else { + // If the reference was to a slot we rely on the convenient property + // that it doesn't matter whether a value (eg, ebx pushed above) is + // right on top of or right underneath a zero-sized reference. + each.SetValue(NOT_CONST_INIT); + frame_->Drop(); + } + } + } + // Unloading a reference may leave the frame in an unspilled state. + frame_->SpillAll(); + + // Body. + CheckStack(); // TODO(1222600): ignore if body contains calls. + VisitAndSpill(node->body()); + + // Next. Reestablish a spilled frame in case we are coming here via + // a continue in the body. + node->continue_target()->Bind(); + frame_->SpillAll(); + frame_->EmitPop(eax); + __ add(Operand(eax), Immediate(Smi::FromInt(1))); + frame_->EmitPush(eax); + entry.Jump(); + + // Cleanup. No need to spill because VirtualFrame::Drop is safe for + // any frame. + node->break_target()->Bind(); + frame_->Drop(5); + + // Exit. + exit.Bind(); + + node->continue_target()->Unuse(); + node->break_target()->Unuse(); +} + + +void CodeGenerator::VisitTryCatchStatement(TryCatchStatement* node) { + ASSERT(!in_spilled_code()); + VirtualFrame::SpilledScope spilled_scope; + Comment cmnt(masm_, "[ TryCatchStatement"); + CodeForStatementPosition(node); + + JumpTarget try_block; + JumpTarget exit; + + try_block.Call(); + // --- Catch block --- + frame_->EmitPush(eax); + + // Store the caught exception in the catch variable. + Variable* catch_var = node->catch_var()->var(); + ASSERT(catch_var != NULL && catch_var->AsSlot() != NULL); + StoreToSlot(catch_var->AsSlot(), NOT_CONST_INIT); + + // Remove the exception from the stack. + frame_->Drop(); + + VisitStatementsAndSpill(node->catch_block()->statements()); + if (has_valid_frame()) { + exit.Jump(); + } + + + // --- Try block --- + try_block.Bind(); + + frame_->PushTryHandler(TRY_CATCH_HANDLER); + int handler_height = frame_->height(); + + // Shadow the jump targets for all escapes from the try block, including + // returns. During shadowing, the original target is hidden as the + // ShadowTarget and operations on the original actually affect the + // shadowing target. + // + // We should probably try to unify the escaping targets and the return + // target. + int nof_escapes = node->escaping_targets()->length(); + List<ShadowTarget*> shadows(1 + nof_escapes); + + // Add the shadow target for the function return. + static const int kReturnShadowIndex = 0; + shadows.Add(new ShadowTarget(&function_return_)); + bool function_return_was_shadowed = function_return_is_shadowed_; + function_return_is_shadowed_ = true; + ASSERT(shadows[kReturnShadowIndex]->other_target() == &function_return_); + + // Add the remaining shadow targets. + for (int i = 0; i < nof_escapes; i++) { + shadows.Add(new ShadowTarget(node->escaping_targets()->at(i))); + } + + // Generate code for the statements in the try block. + VisitStatementsAndSpill(node->try_block()->statements()); + + // Stop the introduced shadowing and count the number of required unlinks. + // After shadowing stops, the original targets are unshadowed and the + // ShadowTargets represent the formerly shadowing targets. + bool has_unlinks = false; + for (int i = 0; i < shadows.length(); i++) { + shadows[i]->StopShadowing(); + has_unlinks = has_unlinks || shadows[i]->is_linked(); + } + function_return_is_shadowed_ = function_return_was_shadowed; + + // Get an external reference to the handler address. + ExternalReference handler_address(Isolate::k_handler_address, + masm()->isolate()); + + // Make sure that there's nothing left on the stack above the + // handler structure. + if (FLAG_debug_code) { + __ mov(eax, Operand::StaticVariable(handler_address)); + __ cmp(esp, Operand(eax)); + __ Assert(equal, "stack pointer should point to top handler"); + } + + // If we can fall off the end of the try block, unlink from try chain. + if (has_valid_frame()) { + // The next handler address is on top of the frame. Unlink from + // the handler list and drop the rest of this handler from the + // frame. + STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); + frame_->EmitPop(Operand::StaticVariable(handler_address)); + frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1); + if (has_unlinks) { + exit.Jump(); + } + } + + // Generate unlink code for the (formerly) shadowing targets that + // have been jumped to. Deallocate each shadow target. + Result return_value; + for (int i = 0; i < shadows.length(); i++) { + if (shadows[i]->is_linked()) { + // Unlink from try chain; be careful not to destroy the TOS if + // there is one. + if (i == kReturnShadowIndex) { + shadows[i]->Bind(&return_value); + return_value.ToRegister(eax); + } else { + shadows[i]->Bind(); + } + // Because we can be jumping here (to spilled code) from + // unspilled code, we need to reestablish a spilled frame at + // this block. + frame_->SpillAll(); + + // Reload sp from the top handler, because some statements that we + // break from (eg, for...in) may have left stuff on the stack. + __ mov(esp, Operand::StaticVariable(handler_address)); + frame_->Forget(frame_->height() - handler_height); + + STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); + frame_->EmitPop(Operand::StaticVariable(handler_address)); + frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1); + + if (i == kReturnShadowIndex) { + if (!function_return_is_shadowed_) frame_->PrepareForReturn(); + shadows[i]->other_target()->Jump(&return_value); + } else { + shadows[i]->other_target()->Jump(); + } + } + } + + exit.Bind(); +} + + +void CodeGenerator::VisitTryFinallyStatement(TryFinallyStatement* node) { + ASSERT(!in_spilled_code()); + VirtualFrame::SpilledScope spilled_scope; + Comment cmnt(masm_, "[ TryFinallyStatement"); + CodeForStatementPosition(node); + + // State: Used to keep track of reason for entering the finally + // block. Should probably be extended to hold information for + // break/continue from within the try block. + enum { FALLING, THROWING, JUMPING }; + + JumpTarget try_block; + JumpTarget finally_block; + + try_block.Call(); + + frame_->EmitPush(eax); + // In case of thrown exceptions, this is where we continue. + __ Set(ecx, Immediate(Smi::FromInt(THROWING))); + finally_block.Jump(); + + // --- Try block --- + try_block.Bind(); + + frame_->PushTryHandler(TRY_FINALLY_HANDLER); + int handler_height = frame_->height(); + + // Shadow the jump targets for all escapes from the try block, including + // returns. During shadowing, the original target is hidden as the + // ShadowTarget and operations on the original actually affect the + // shadowing target. + // + // We should probably try to unify the escaping targets and the return + // target. + int nof_escapes = node->escaping_targets()->length(); + List<ShadowTarget*> shadows(1 + nof_escapes); + + // Add the shadow target for the function return. + static const int kReturnShadowIndex = 0; + shadows.Add(new ShadowTarget(&function_return_)); + bool function_return_was_shadowed = function_return_is_shadowed_; + function_return_is_shadowed_ = true; + ASSERT(shadows[kReturnShadowIndex]->other_target() == &function_return_); + + // Add the remaining shadow targets. + for (int i = 0; i < nof_escapes; i++) { + shadows.Add(new ShadowTarget(node->escaping_targets()->at(i))); + } + + // Generate code for the statements in the try block. + VisitStatementsAndSpill(node->try_block()->statements()); + + // Stop the introduced shadowing and count the number of required unlinks. + // After shadowing stops, the original targets are unshadowed and the + // ShadowTargets represent the formerly shadowing targets. + int nof_unlinks = 0; + for (int i = 0; i < shadows.length(); i++) { + shadows[i]->StopShadowing(); + if (shadows[i]->is_linked()) nof_unlinks++; + } + function_return_is_shadowed_ = function_return_was_shadowed; + + // Get an external reference to the handler address. + ExternalReference handler_address(Isolate::k_handler_address, + masm()->isolate()); + + // If we can fall off the end of the try block, unlink from the try + // chain and set the state on the frame to FALLING. + if (has_valid_frame()) { + // The next handler address is on top of the frame. + STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); + frame_->EmitPop(Operand::StaticVariable(handler_address)); + frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1); + + // Fake a top of stack value (unneeded when FALLING) and set the + // state in ecx, then jump around the unlink blocks if any. + frame_->EmitPush(Immediate(FACTORY->undefined_value())); + __ Set(ecx, Immediate(Smi::FromInt(FALLING))); + if (nof_unlinks > 0) { + finally_block.Jump(); + } + } + + // Generate code to unlink and set the state for the (formerly) + // shadowing targets that have been jumped to. + for (int i = 0; i < shadows.length(); i++) { + if (shadows[i]->is_linked()) { + // If we have come from the shadowed return, the return value is + // on the virtual frame. We must preserve it until it is + // pushed. + if (i == kReturnShadowIndex) { + Result return_value; + shadows[i]->Bind(&return_value); + return_value.ToRegister(eax); + } else { + shadows[i]->Bind(); + } + // Because we can be jumping here (to spilled code) from + // unspilled code, we need to reestablish a spilled frame at + // this block. + frame_->SpillAll(); + + // Reload sp from the top handler, because some statements that + // we break from (eg, for...in) may have left stuff on the + // stack. + __ mov(esp, Operand::StaticVariable(handler_address)); + frame_->Forget(frame_->height() - handler_height); + + // Unlink this handler and drop it from the frame. + STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); + frame_->EmitPop(Operand::StaticVariable(handler_address)); + frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1); + + if (i == kReturnShadowIndex) { + // If this target shadowed the function return, materialize + // the return value on the stack. + frame_->EmitPush(eax); + } else { + // Fake TOS for targets that shadowed breaks and continues. + frame_->EmitPush(Immediate(FACTORY->undefined_value())); + } + __ Set(ecx, Immediate(Smi::FromInt(JUMPING + i))); + if (--nof_unlinks > 0) { + // If this is not the last unlink block, jump around the next. + finally_block.Jump(); + } + } + } + + // --- Finally block --- + finally_block.Bind(); + + // Push the state on the stack. + frame_->EmitPush(ecx); + + // We keep two elements on the stack - the (possibly faked) result + // and the state - while evaluating the finally block. + // + // Generate code for the statements in the finally block. + VisitStatementsAndSpill(node->finally_block()->statements()); + + if (has_valid_frame()) { + // Restore state and return value or faked TOS. + frame_->EmitPop(ecx); + frame_->EmitPop(eax); + } + + // Generate code to jump to the right destination for all used + // formerly shadowing targets. Deallocate each shadow target. + for (int i = 0; i < shadows.length(); i++) { + if (has_valid_frame() && shadows[i]->is_bound()) { + BreakTarget* original = shadows[i]->other_target(); + __ cmp(Operand(ecx), Immediate(Smi::FromInt(JUMPING + i))); + if (i == kReturnShadowIndex) { + // The return value is (already) in eax. + Result return_value = allocator_->Allocate(eax); + ASSERT(return_value.is_valid()); + if (function_return_is_shadowed_) { + original->Branch(equal, &return_value); + } else { + // Branch around the preparation for return which may emit + // code. + JumpTarget skip; + skip.Branch(not_equal); + frame_->PrepareForReturn(); + original->Jump(&return_value); + skip.Bind(); + } + } else { + original->Branch(equal); + } + } + } + + if (has_valid_frame()) { + // Check if we need to rethrow the exception. + JumpTarget exit; + __ cmp(Operand(ecx), Immediate(Smi::FromInt(THROWING))); + exit.Branch(not_equal); + + // Rethrow exception. + frame_->EmitPush(eax); // undo pop from above + frame_->CallRuntime(Runtime::kReThrow, 1); + + // Done. + exit.Bind(); + } +} + + +void CodeGenerator::VisitDebuggerStatement(DebuggerStatement* node) { + ASSERT(!in_spilled_code()); + Comment cmnt(masm_, "[ DebuggerStatement"); + CodeForStatementPosition(node); +#ifdef ENABLE_DEBUGGER_SUPPORT + // Spill everything, even constants, to the frame. + frame_->SpillAll(); + + frame_->DebugBreak(); + // Ignore the return value. +#endif +} + + +Result CodeGenerator::InstantiateFunction( + Handle<SharedFunctionInfo> function_info, + bool pretenure) { + // The inevitable call will sync frame elements to memory anyway, so + // we do it eagerly to allow us to push the arguments directly into + // place. + frame()->SyncRange(0, frame()->element_count() - 1); + + // Use the fast case closure allocation code that allocates in new + // space for nested functions that don't need literals cloning. + if (!pretenure && + scope()->is_function_scope() && + function_info->num_literals() == 0) { + FastNewClosureStub stub( + function_info->strict_mode() ? kStrictMode : kNonStrictMode); + frame()->EmitPush(Immediate(function_info)); + return frame()->CallStub(&stub, 1); + } else { + // Call the runtime to instantiate the function based on the + // shared function info. + frame()->EmitPush(esi); + frame()->EmitPush(Immediate(function_info)); + frame()->EmitPush(Immediate(pretenure + ? FACTORY->true_value() + : FACTORY->false_value())); + return frame()->CallRuntime(Runtime::kNewClosure, 3); + } +} + + +void CodeGenerator::VisitFunctionLiteral(FunctionLiteral* node) { + Comment cmnt(masm_, "[ FunctionLiteral"); + ASSERT(!in_safe_int32_mode()); + // Build the function info and instantiate it. + Handle<SharedFunctionInfo> function_info = + Compiler::BuildFunctionInfo(node, script()); + // Check for stack-overflow exception. + if (function_info.is_null()) { + SetStackOverflow(); + return; + } + Result result = InstantiateFunction(function_info, node->pretenure()); + frame()->Push(&result); +} + + +void CodeGenerator::VisitSharedFunctionInfoLiteral( + SharedFunctionInfoLiteral* node) { + ASSERT(!in_safe_int32_mode()); + Comment cmnt(masm_, "[ SharedFunctionInfoLiteral"); + Result result = InstantiateFunction(node->shared_function_info(), false); + frame()->Push(&result); +} + + +void CodeGenerator::VisitConditional(Conditional* node) { + Comment cmnt(masm_, "[ Conditional"); + ASSERT(!in_safe_int32_mode()); + JumpTarget then; + JumpTarget else_; + JumpTarget exit; + ControlDestination dest(&then, &else_, true); + LoadCondition(node->condition(), &dest, true); + + if (dest.false_was_fall_through()) { + // The else target was bound, so we compile the else part first. + Load(node->else_expression()); + + if (then.is_linked()) { + exit.Jump(); + then.Bind(); + Load(node->then_expression()); + } + } else { + // The then target was bound, so we compile the then part first. + Load(node->then_expression()); + + if (else_.is_linked()) { + exit.Jump(); + else_.Bind(); + Load(node->else_expression()); + } + } + + exit.Bind(); +} + + +void CodeGenerator::LoadFromSlot(Slot* slot, TypeofState typeof_state) { + if (slot->type() == Slot::LOOKUP) { + ASSERT(slot->var()->is_dynamic()); + JumpTarget slow; + JumpTarget done; + Result value; + + // Generate fast case for loading from slots that correspond to + // local/global variables or arguments unless they are shadowed by + // eval-introduced bindings. + EmitDynamicLoadFromSlotFastCase(slot, + typeof_state, + &value, + &slow, + &done); + + slow.Bind(); + // A runtime call is inevitable. We eagerly sync frame elements + // to memory so that we can push the arguments directly into place + // on top of the frame. + frame()->SyncRange(0, frame()->element_count() - 1); + frame()->EmitPush(esi); + frame()->EmitPush(Immediate(slot->var()->name())); + if (typeof_state == INSIDE_TYPEOF) { + value = + frame()->CallRuntime(Runtime::kLoadContextSlotNoReferenceError, 2); + } else { + value = frame()->CallRuntime(Runtime::kLoadContextSlot, 2); + } + + done.Bind(&value); + frame_->Push(&value); + + } else if (slot->var()->mode() == Variable::CONST) { + // Const slots may contain 'the hole' value (the constant hasn't been + // initialized yet) which needs to be converted into the 'undefined' + // value. + // + // We currently spill the virtual frame because constants use the + // potentially unsafe direct-frame access of SlotOperand. + VirtualFrame::SpilledScope spilled_scope; + Comment cmnt(masm_, "[ Load const"); + Label exit; + __ mov(ecx, SlotOperand(slot, ecx)); + __ cmp(ecx, FACTORY->the_hole_value()); + __ j(not_equal, &exit); + __ mov(ecx, FACTORY->undefined_value()); + __ bind(&exit); + frame()->EmitPush(ecx); + + } else if (slot->type() == Slot::PARAMETER) { + frame()->PushParameterAt(slot->index()); + + } else if (slot->type() == Slot::LOCAL) { + frame()->PushLocalAt(slot->index()); + + } else { + // The other remaining slot types (LOOKUP and GLOBAL) cannot reach + // here. + // + // The use of SlotOperand below is safe for an unspilled frame + // because it will always be a context slot. + ASSERT(slot->type() == Slot::CONTEXT); + Result temp = allocator()->Allocate(); + ASSERT(temp.is_valid()); + __ mov(temp.reg(), SlotOperand(slot, temp.reg())); + frame()->Push(&temp); + } +} + + +void CodeGenerator::LoadFromSlotCheckForArguments(Slot* slot, + TypeofState state) { + LoadFromSlot(slot, state); + + // Bail out quickly if we're not using lazy arguments allocation. + if (ArgumentsMode() != LAZY_ARGUMENTS_ALLOCATION) return; + + // ... or if the slot isn't a non-parameter arguments slot. + if (slot->type() == Slot::PARAMETER || !slot->is_arguments()) return; + + // If the loaded value is a constant, we know if the arguments + // object has been lazily loaded yet. + Result result = frame()->Pop(); + if (result.is_constant()) { + if (result.handle()->IsArgumentsMarker()) { + result = StoreArgumentsObject(false); + } + frame()->Push(&result); + return; + } + ASSERT(result.is_register()); + // The loaded value is in a register. If it is the sentinel that + // indicates that we haven't loaded the arguments object yet, we + // need to do it now. + JumpTarget exit; + __ cmp(Operand(result.reg()), Immediate(FACTORY->arguments_marker())); + frame()->Push(&result); + exit.Branch(not_equal); + + result = StoreArgumentsObject(false); + frame()->SetElementAt(0, &result); + result.Unuse(); + exit.Bind(); + return; +} + + +Result CodeGenerator::LoadFromGlobalSlotCheckExtensions( + Slot* slot, + TypeofState typeof_state, + JumpTarget* slow) { + ASSERT(!in_safe_int32_mode()); + // Check that no extension objects have been created by calls to + // eval from the current scope to the global scope. + Register context = esi; + Result tmp = allocator_->Allocate(); + ASSERT(tmp.is_valid()); // All non-reserved registers were available. + + Scope* s = scope(); + while (s != NULL) { + if (s->num_heap_slots() > 0) { + if (s->calls_eval()) { + // Check that extension is NULL. + __ cmp(ContextOperand(context, Context::EXTENSION_INDEX), + Immediate(0)); + slow->Branch(not_equal, not_taken); + } + // Load next context in chain. + __ mov(tmp.reg(), ContextOperand(context, Context::CLOSURE_INDEX)); + __ mov(tmp.reg(), FieldOperand(tmp.reg(), JSFunction::kContextOffset)); + context = tmp.reg(); + } + // If no outer scope calls eval, we do not need to check more + // context extensions. If we have reached an eval scope, we check + // all extensions from this point. + if (!s->outer_scope_calls_eval() || s->is_eval_scope()) break; + s = s->outer_scope(); + } + + if (s != NULL && s->is_eval_scope()) { + // Loop up the context chain. There is no frame effect so it is + // safe to use raw labels here. + Label next, fast; + if (!context.is(tmp.reg())) { + __ mov(tmp.reg(), context); + } + __ bind(&next); + // Terminate at global context. + __ cmp(FieldOperand(tmp.reg(), HeapObject::kMapOffset), + Immediate(FACTORY->global_context_map())); + __ j(equal, &fast); + // Check that extension is NULL. + __ cmp(ContextOperand(tmp.reg(), Context::EXTENSION_INDEX), Immediate(0)); + slow->Branch(not_equal, not_taken); + // Load next context in chain. + __ mov(tmp.reg(), ContextOperand(tmp.reg(), Context::CLOSURE_INDEX)); + __ mov(tmp.reg(), FieldOperand(tmp.reg(), JSFunction::kContextOffset)); + __ jmp(&next); + __ bind(&fast); + } + tmp.Unuse(); + + // All extension objects were empty and it is safe to use a global + // load IC call. + // The register allocator prefers eax if it is free, so the code generator + // will load the global object directly into eax, which is where the LoadIC + // expects it. + frame_->Spill(eax); + LoadGlobal(); + frame_->Push(slot->var()->name()); + RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF) + ? RelocInfo::CODE_TARGET + : RelocInfo::CODE_TARGET_CONTEXT; + Result answer = frame_->CallLoadIC(mode); + // A test eax instruction following the call signals that the inobject + // property case was inlined. Ensure that there is not a test eax + // instruction here. + __ nop(); + return answer; +} + + +void CodeGenerator::EmitDynamicLoadFromSlotFastCase(Slot* slot, + TypeofState typeof_state, + Result* result, + JumpTarget* slow, + JumpTarget* done) { + // Generate fast-case code for variables that might be shadowed by + // eval-introduced variables. Eval is used a lot without + // introducing variables. In those cases, we do not want to + // perform a runtime call for all variables in the scope + // containing the eval. + if (slot->var()->mode() == Variable::DYNAMIC_GLOBAL) { + *result = LoadFromGlobalSlotCheckExtensions(slot, typeof_state, slow); + done->Jump(result); + + } else if (slot->var()->mode() == Variable::DYNAMIC_LOCAL) { + Slot* potential_slot = slot->var()->local_if_not_shadowed()->AsSlot(); + Expression* rewrite = slot->var()->local_if_not_shadowed()->rewrite(); + if (potential_slot != NULL) { + // Generate fast case for locals that rewrite to slots. + // Allocate a fresh register to use as a temp in + // ContextSlotOperandCheckExtensions and to hold the result + // value. + *result = allocator()->Allocate(); + ASSERT(result->is_valid()); + __ mov(result->reg(), + ContextSlotOperandCheckExtensions(potential_slot, *result, slow)); + if (potential_slot->var()->mode() == Variable::CONST) { + __ cmp(result->reg(), FACTORY->the_hole_value()); + done->Branch(not_equal, result); + __ mov(result->reg(), FACTORY->undefined_value()); + } + done->Jump(result); + } else if (rewrite != NULL) { + // Generate fast case for calls of an argument function. + Property* property = rewrite->AsProperty(); + if (property != NULL) { + VariableProxy* obj_proxy = property->obj()->AsVariableProxy(); + Literal* key_literal = property->key()->AsLiteral(); + if (obj_proxy != NULL && + key_literal != NULL && + obj_proxy->IsArguments() && + key_literal->handle()->IsSmi()) { + // Load arguments object if there are no eval-introduced + // variables. Then load the argument from the arguments + // object using keyed load. + Result arguments = allocator()->Allocate(); + ASSERT(arguments.is_valid()); + __ mov(arguments.reg(), + ContextSlotOperandCheckExtensions(obj_proxy->var()->AsSlot(), + arguments, + slow)); + frame_->Push(&arguments); + frame_->Push(key_literal->handle()); + *result = EmitKeyedLoad(); + done->Jump(result); + } + } + } + } +} + + +void CodeGenerator::StoreToSlot(Slot* slot, InitState init_state) { + if (slot->type() == Slot::LOOKUP) { + ASSERT(slot->var()->is_dynamic()); + + // For now, just do a runtime call. Since the call is inevitable, + // we eagerly sync the virtual frame so we can directly push the + // arguments into place. + frame_->SyncRange(0, frame_->element_count() - 1); + + frame_->EmitPush(esi); + frame_->EmitPush(Immediate(slot->var()->name())); + + Result value; + if (init_state == CONST_INIT) { + // Same as the case for a normal store, but ignores attribute + // (e.g. READ_ONLY) of context slot so that we can initialize const + // properties (introduced via eval("const foo = (some expr);")). Also, + // uses the current function context instead of the top context. + // + // Note that we must declare the foo upon entry of eval(), via a + // context slot declaration, but we cannot initialize it at the same + // time, because the const declaration may be at the end of the eval + // code (sigh...) and the const variable may have been used before + // (where its value is 'undefined'). Thus, we can only do the + // initialization when we actually encounter the expression and when + // the expression operands are defined and valid, and thus we need the + // split into 2 operations: declaration of the context slot followed + // by initialization. + value = frame_->CallRuntime(Runtime::kInitializeConstContextSlot, 3); + } else { + frame_->Push(Smi::FromInt(strict_mode_flag())); + value = frame_->CallRuntime(Runtime::kStoreContextSlot, 4); + } + // Storing a variable must keep the (new) value on the expression + // stack. This is necessary for compiling chained assignment + // expressions. + frame_->Push(&value); + + } else { + ASSERT(!slot->var()->is_dynamic()); + + JumpTarget exit; + if (init_state == CONST_INIT) { + ASSERT(slot->var()->mode() == Variable::CONST); + // Only the first const initialization must be executed (the slot + // still contains 'the hole' value). When the assignment is executed, + // the code is identical to a normal store (see below). + // + // We spill the frame in the code below because the direct-frame + // access of SlotOperand is potentially unsafe with an unspilled + // frame. + VirtualFrame::SpilledScope spilled_scope; + Comment cmnt(masm_, "[ Init const"); + __ mov(ecx, SlotOperand(slot, ecx)); + __ cmp(ecx, FACTORY->the_hole_value()); + exit.Branch(not_equal); + } + + // We must execute the store. Storing a variable must keep the (new) + // value on the stack. This is necessary for compiling assignment + // expressions. + // + // Note: We will reach here even with slot->var()->mode() == + // Variable::CONST because of const declarations which will initialize + // consts to 'the hole' value and by doing so, end up calling this code. + if (slot->type() == Slot::PARAMETER) { + frame_->StoreToParameterAt(slot->index()); + } else if (slot->type() == Slot::LOCAL) { + frame_->StoreToLocalAt(slot->index()); + } else { + // The other slot types (LOOKUP and GLOBAL) cannot reach here. + // + // The use of SlotOperand below is safe for an unspilled frame + // because the slot is a context slot. + ASSERT(slot->type() == Slot::CONTEXT); + frame_->Dup(); + Result value = frame_->Pop(); + value.ToRegister(); + Result start = allocator_->Allocate(); + ASSERT(start.is_valid()); + __ mov(SlotOperand(slot, start.reg()), value.reg()); + // RecordWrite may destroy the value registers. + // + // TODO(204): Avoid actually spilling when the value is not + // needed (probably the common case). + frame_->Spill(value.reg()); + int offset = FixedArray::kHeaderSize + slot->index() * kPointerSize; + Result temp = allocator_->Allocate(); + ASSERT(temp.is_valid()); + __ RecordWrite(start.reg(), offset, value.reg(), temp.reg()); + // The results start, value, and temp are unused by going out of + // scope. + } + + exit.Bind(); + } +} + + +void CodeGenerator::VisitSlot(Slot* slot) { + Comment cmnt(masm_, "[ Slot"); + if (in_safe_int32_mode()) { + if ((slot->type() == Slot::LOCAL && !slot->is_arguments())) { + frame()->UntaggedPushLocalAt(slot->index()); + } else if (slot->type() == Slot::PARAMETER) { + frame()->UntaggedPushParameterAt(slot->index()); + } else { + UNREACHABLE(); + } + } else { + LoadFromSlotCheckForArguments(slot, NOT_INSIDE_TYPEOF); + } +} + + +void CodeGenerator::VisitVariableProxy(VariableProxy* node) { + Comment cmnt(masm_, "[ VariableProxy"); + Variable* var = node->var(); + Expression* expr = var->rewrite(); + if (expr != NULL) { + Visit(expr); + } else { + ASSERT(var->is_global()); + ASSERT(!in_safe_int32_mode()); + Reference ref(this, node); + ref.GetValue(); + } +} + + +void CodeGenerator::VisitLiteral(Literal* node) { + Comment cmnt(masm_, "[ Literal"); + if (frame_->ConstantPoolOverflowed()) { + Result temp = allocator_->Allocate(); + ASSERT(temp.is_valid()); + if (in_safe_int32_mode()) { + temp.set_untagged_int32(true); + } + __ Set(temp.reg(), Immediate(node->handle())); + frame_->Push(&temp); + } else { + if (in_safe_int32_mode()) { + frame_->PushUntaggedElement(node->handle()); + } else { + frame_->Push(node->handle()); + } + } +} + + +void CodeGenerator::PushUnsafeSmi(Handle<Object> value) { + ASSERT(value->IsSmi()); + int bits = reinterpret_cast<int>(*value); + __ push(Immediate(bits ^ jit_cookie_)); + __ xor_(Operand(esp, 0), Immediate(jit_cookie_)); +} + + +void CodeGenerator::StoreUnsafeSmiToLocal(int offset, Handle<Object> value) { + ASSERT(value->IsSmi()); + int bits = reinterpret_cast<int>(*value); + __ mov(Operand(ebp, offset), Immediate(bits ^ jit_cookie_)); + __ xor_(Operand(ebp, offset), Immediate(jit_cookie_)); +} + + +void CodeGenerator::MoveUnsafeSmi(Register target, Handle<Object> value) { + ASSERT(target.is_valid()); + ASSERT(value->IsSmi()); + int bits = reinterpret_cast<int>(*value); + __ Set(target, Immediate(bits ^ jit_cookie_)); + __ xor_(target, jit_cookie_); +} + + +bool CodeGenerator::IsUnsafeSmi(Handle<Object> value) { + if (!value->IsSmi()) return false; + int int_value = Smi::cast(*value)->value(); + return !is_intn(int_value, kMaxSmiInlinedBits); +} + + +// Materialize the regexp literal 'node' in the literals array +// 'literals' of the function. Leave the regexp boilerplate in +// 'boilerplate'. +class DeferredRegExpLiteral: public DeferredCode { + public: + DeferredRegExpLiteral(Register boilerplate, + Register literals, + RegExpLiteral* node) + : boilerplate_(boilerplate), literals_(literals), node_(node) { + set_comment("[ DeferredRegExpLiteral"); + } + + void Generate(); + + private: + Register boilerplate_; + Register literals_; + RegExpLiteral* node_; +}; + + +void DeferredRegExpLiteral::Generate() { + // Since the entry is undefined we call the runtime system to + // compute the literal. + // Literal array (0). + __ push(literals_); + // Literal index (1). + __ push(Immediate(Smi::FromInt(node_->literal_index()))); + // RegExp pattern (2). + __ push(Immediate(node_->pattern())); + // RegExp flags (3). + __ push(Immediate(node_->flags())); + __ CallRuntime(Runtime::kMaterializeRegExpLiteral, 4); + if (!boilerplate_.is(eax)) __ mov(boilerplate_, eax); +} + + +class DeferredAllocateInNewSpace: public DeferredCode { + public: + DeferredAllocateInNewSpace(int size, + Register target, + int registers_to_save = 0) + : size_(size), target_(target), registers_to_save_(registers_to_save) { + ASSERT(size >= kPointerSize && size <= HEAP->MaxObjectSizeInNewSpace()); + ASSERT_EQ(0, registers_to_save & target.bit()); + set_comment("[ DeferredAllocateInNewSpace"); + } + void Generate(); + + private: + int size_; + Register target_; + int registers_to_save_; +}; + + +void DeferredAllocateInNewSpace::Generate() { + for (int i = 0; i < kNumRegs; i++) { + if (registers_to_save_ & (1 << i)) { + Register save_register = { i }; + __ push(save_register); + } + } + __ push(Immediate(Smi::FromInt(size_))); + __ CallRuntime(Runtime::kAllocateInNewSpace, 1); + if (!target_.is(eax)) { + __ mov(target_, eax); + } + for (int i = kNumRegs - 1; i >= 0; i--) { + if (registers_to_save_ & (1 << i)) { + Register save_register = { i }; + __ pop(save_register); + } + } +} + + +void CodeGenerator::VisitRegExpLiteral(RegExpLiteral* node) { + ASSERT(!in_safe_int32_mode()); + Comment cmnt(masm_, "[ RegExp Literal"); + + // Retrieve the literals array and check the allocated entry. Begin + // with a writable copy of the function of this activation in a + // register. + frame_->PushFunction(); + Result literals = frame_->Pop(); + literals.ToRegister(); + frame_->Spill(literals.reg()); + + // Load the literals array of the function. + __ mov(literals.reg(), + FieldOperand(literals.reg(), JSFunction::kLiteralsOffset)); + + // Load the literal at the ast saved index. + Result boilerplate = allocator_->Allocate(); + ASSERT(boilerplate.is_valid()); + int literal_offset = + FixedArray::kHeaderSize + node->literal_index() * kPointerSize; + __ mov(boilerplate.reg(), FieldOperand(literals.reg(), literal_offset)); + + // Check whether we need to materialize the RegExp object. If so, + // jump to the deferred code passing the literals array. + DeferredRegExpLiteral* deferred = + new DeferredRegExpLiteral(boilerplate.reg(), literals.reg(), node); + __ cmp(boilerplate.reg(), FACTORY->undefined_value()); + deferred->Branch(equal); + deferred->BindExit(); + + // Register of boilerplate contains RegExp object. + + Result tmp = allocator()->Allocate(); + ASSERT(tmp.is_valid()); + + int size = JSRegExp::kSize + JSRegExp::kInObjectFieldCount * kPointerSize; + + DeferredAllocateInNewSpace* allocate_fallback = + new DeferredAllocateInNewSpace(size, literals.reg()); + frame_->Push(&boilerplate); + frame_->SpillTop(); + __ AllocateInNewSpace(size, + literals.reg(), + tmp.reg(), + no_reg, + allocate_fallback->entry_label(), + TAG_OBJECT); + allocate_fallback->BindExit(); + boilerplate = frame_->Pop(); + // Copy from boilerplate to clone and return clone. + + for (int i = 0; i < size; i += kPointerSize) { + __ mov(tmp.reg(), FieldOperand(boilerplate.reg(), i)); + __ mov(FieldOperand(literals.reg(), i), tmp.reg()); + } + frame_->Push(&literals); +} + + +void CodeGenerator::VisitObjectLiteral(ObjectLiteral* node) { + ASSERT(!in_safe_int32_mode()); + Comment cmnt(masm_, "[ ObjectLiteral"); + + // Load a writable copy of the function of this activation in a + // register. + frame_->PushFunction(); + Result literals = frame_->Pop(); + literals.ToRegister(); + frame_->Spill(literals.reg()); + + // Load the literals array of the function. + __ mov(literals.reg(), + FieldOperand(literals.reg(), JSFunction::kLiteralsOffset)); + // Literal array. + frame_->Push(&literals); + // Literal index. + frame_->Push(Smi::FromInt(node->literal_index())); + // Constant properties. + frame_->Push(node->constant_properties()); + // Should the object literal have fast elements? + frame_->Push(Smi::FromInt(node->fast_elements() ? 1 : 0)); + Result clone; + if (node->depth() > 1) { + clone = frame_->CallRuntime(Runtime::kCreateObjectLiteral, 4); + } else { + clone = frame_->CallRuntime(Runtime::kCreateObjectLiteralShallow, 4); + } + frame_->Push(&clone); + + // Mark all computed expressions that are bound to a key that + // is shadowed by a later occurrence of the same key. For the + // marked expressions, no store code is emitted. + node->CalculateEmitStore(); + + for (int i = 0; i < node->properties()->length(); i++) { + ObjectLiteral::Property* property = node->properties()->at(i); + switch (property->kind()) { + case ObjectLiteral::Property::CONSTANT: + break; + case ObjectLiteral::Property::MATERIALIZED_LITERAL: + if (CompileTimeValue::IsCompileTimeValue(property->value())) break; + // else fall through. + case ObjectLiteral::Property::COMPUTED: { + Handle<Object> key(property->key()->handle()); + if (key->IsSymbol()) { + // Duplicate the object as the IC receiver. + frame_->Dup(); + Load(property->value()); + if (property->emit_store()) { + Result ignored = + frame_->CallStoreIC(Handle<String>::cast(key), false, + strict_mode_flag()); + // A test eax instruction following the store IC call would + // indicate the presence of an inlined version of the + // store. Add a nop to indicate that there is no such + // inlined version. + __ nop(); + } else { + frame_->Drop(2); + } + break; + } + // Fall through + } + case ObjectLiteral::Property::PROTOTYPE: { + // Duplicate the object as an argument to the runtime call. + frame_->Dup(); + Load(property->key()); + Load(property->value()); + if (property->emit_store()) { + frame_->Push(Smi::FromInt(NONE)); // PropertyAttributes + // Ignore the result. + Result ignored = frame_->CallRuntime(Runtime::kSetProperty, 4); + } else { + frame_->Drop(3); + } + break; + } + case ObjectLiteral::Property::SETTER: { + // Duplicate the object as an argument to the runtime call. + frame_->Dup(); + Load(property->key()); + frame_->Push(Smi::FromInt(1)); + Load(property->value()); + Result ignored = frame_->CallRuntime(Runtime::kDefineAccessor, 4); + // Ignore the result. + break; + } + case ObjectLiteral::Property::GETTER: { + // Duplicate the object as an argument to the runtime call. + frame_->Dup(); + Load(property->key()); + frame_->Push(Smi::FromInt(0)); + Load(property->value()); + Result ignored = frame_->CallRuntime(Runtime::kDefineAccessor, 4); + // Ignore the result. + break; + } + default: UNREACHABLE(); + } + } +} + + +void CodeGenerator::VisitArrayLiteral(ArrayLiteral* node) { + ASSERT(!in_safe_int32_mode()); + Comment cmnt(masm_, "[ ArrayLiteral"); + + // Load a writable copy of the function of this activation in a + // register. + frame_->PushFunction(); + Result literals = frame_->Pop(); + literals.ToRegister(); + frame_->Spill(literals.reg()); + + // Load the literals array of the function. + __ mov(literals.reg(), + FieldOperand(literals.reg(), JSFunction::kLiteralsOffset)); + + frame_->Push(&literals); + frame_->Push(Smi::FromInt(node->literal_index())); + frame_->Push(node->constant_elements()); + int length = node->values()->length(); + Result clone; + if (node->constant_elements()->map() == HEAP->fixed_cow_array_map()) { + FastCloneShallowArrayStub stub( + FastCloneShallowArrayStub::COPY_ON_WRITE_ELEMENTS, length); + clone = frame_->CallStub(&stub, 3); + Counters* counters = masm()->isolate()->counters(); + __ IncrementCounter(counters->cow_arrays_created_stub(), 1); + } else if (node->depth() > 1) { + clone = frame_->CallRuntime(Runtime::kCreateArrayLiteral, 3); + } else if (length > FastCloneShallowArrayStub::kMaximumClonedLength) { + clone = frame_->CallRuntime(Runtime::kCreateArrayLiteralShallow, 3); + } else { + FastCloneShallowArrayStub stub( + FastCloneShallowArrayStub::CLONE_ELEMENTS, length); + clone = frame_->CallStub(&stub, 3); + } + frame_->Push(&clone); + + // Generate code to set the elements in the array that are not + // literals. + for (int i = 0; i < length; i++) { + Expression* value = node->values()->at(i); + + if (!CompileTimeValue::ArrayLiteralElementNeedsInitialization(value)) { + continue; + } + + // The property must be set by generated code. + Load(value); + + // Get the property value off the stack. + Result prop_value = frame_->Pop(); + prop_value.ToRegister(); + + // Fetch the array literal while leaving a copy on the stack and + // use it to get the elements array. + frame_->Dup(); + Result elements = frame_->Pop(); + elements.ToRegister(); + frame_->Spill(elements.reg()); + // Get the elements array. + __ mov(elements.reg(), + FieldOperand(elements.reg(), JSObject::kElementsOffset)); + + // Write to the indexed properties array. + int offset = i * kPointerSize + FixedArray::kHeaderSize; + __ mov(FieldOperand(elements.reg(), offset), prop_value.reg()); + + // Update the write barrier for the array address. + frame_->Spill(prop_value.reg()); // Overwritten by the write barrier. + Result scratch = allocator_->Allocate(); + ASSERT(scratch.is_valid()); + __ RecordWrite(elements.reg(), offset, prop_value.reg(), scratch.reg()); + } +} + + +void CodeGenerator::VisitCatchExtensionObject(CatchExtensionObject* node) { + ASSERT(!in_safe_int32_mode()); + ASSERT(!in_spilled_code()); + // Call runtime routine to allocate the catch extension object and + // assign the exception value to the catch variable. + Comment cmnt(masm_, "[ CatchExtensionObject"); + Load(node->key()); + Load(node->value()); + Result result = + frame_->CallRuntime(Runtime::kCreateCatchExtensionObject, 2); + frame_->Push(&result); +} + + +void CodeGenerator::EmitSlotAssignment(Assignment* node) { +#ifdef DEBUG + int original_height = frame()->height(); +#endif + Comment cmnt(masm(), "[ Variable Assignment"); + Variable* var = node->target()->AsVariableProxy()->AsVariable(); + ASSERT(var != NULL); + Slot* slot = var->AsSlot(); + ASSERT(slot != NULL); + + // Evaluate the right-hand side. + if (node->is_compound()) { + // For a compound assignment the right-hand side is a binary operation + // between the current property value and the actual right-hand side. + LoadFromSlotCheckForArguments(slot, NOT_INSIDE_TYPEOF); + Load(node->value()); + + // Perform the binary operation. + bool overwrite_value = node->value()->ResultOverwriteAllowed(); + // Construct the implicit binary operation. + BinaryOperation expr(node); + GenericBinaryOperation(&expr, + overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE); + } else { + // For non-compound assignment just load the right-hand side. + Load(node->value()); + } + + // Perform the assignment. + if (var->mode() != Variable::CONST || node->op() == Token::INIT_CONST) { + CodeForSourcePosition(node->position()); + StoreToSlot(slot, + node->op() == Token::INIT_CONST ? CONST_INIT : NOT_CONST_INIT); + } + ASSERT(frame()->height() == original_height + 1); +} + + +void CodeGenerator::EmitNamedPropertyAssignment(Assignment* node) { +#ifdef DEBUG + int original_height = frame()->height(); +#endif + Comment cmnt(masm(), "[ Named Property Assignment"); + Variable* var = node->target()->AsVariableProxy()->AsVariable(); + Property* prop = node->target()->AsProperty(); + ASSERT(var == NULL || (prop == NULL && var->is_global())); + + // Initialize name and evaluate the receiver sub-expression if necessary. If + // the receiver is trivial it is not placed on the stack at this point, but + // loaded whenever actually needed. + Handle<String> name; + bool is_trivial_receiver = false; + if (var != NULL) { + name = var->name(); + } else { + Literal* lit = prop->key()->AsLiteral(); + ASSERT_NOT_NULL(lit); + name = Handle<String>::cast(lit->handle()); + // Do not materialize the receiver on the frame if it is trivial. + is_trivial_receiver = prop->obj()->IsTrivial(); + if (!is_trivial_receiver) Load(prop->obj()); + } + + // Change to slow case in the beginning of an initialization block to + // avoid the quadratic behavior of repeatedly adding fast properties. + if (node->starts_initialization_block()) { + // Initialization block consists of assignments of the form expr.x = ..., so + // this will never be an assignment to a variable, so there must be a + // receiver object. + ASSERT_EQ(NULL, var); + if (is_trivial_receiver) { + frame()->Push(prop->obj()); + } else { + frame()->Dup(); + } + Result ignored = frame()->CallRuntime(Runtime::kToSlowProperties, 1); + } + + // Change to fast case at the end of an initialization block. To prepare for + // that add an extra copy of the receiver to the frame, so that it can be + // converted back to fast case after the assignment. + if (node->ends_initialization_block() && !is_trivial_receiver) { + frame()->Dup(); + } + + // Stack layout: + // [tos] : receiver (only materialized if non-trivial) + // [tos+1] : receiver if at the end of an initialization block + + // Evaluate the right-hand side. + if (node->is_compound()) { + // For a compound assignment the right-hand side is a binary operation + // between the current property value and the actual right-hand side. + if (is_trivial_receiver) { + frame()->Push(prop->obj()); + } else if (var != NULL) { + // The LoadIC stub expects the object in eax. + // Freeing eax causes the code generator to load the global into it. + frame_->Spill(eax); + LoadGlobal(); + } else { + frame()->Dup(); + } + Result value = EmitNamedLoad(name, var != NULL); + frame()->Push(&value); + Load(node->value()); + + bool overwrite_value = node->value()->ResultOverwriteAllowed(); + // Construct the implicit binary operation. + BinaryOperation expr(node); + GenericBinaryOperation(&expr, + overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE); + } else { + // For non-compound assignment just load the right-hand side. + Load(node->value()); + } + + // Stack layout: + // [tos] : value + // [tos+1] : receiver (only materialized if non-trivial) + // [tos+2] : receiver if at the end of an initialization block + + // Perform the assignment. It is safe to ignore constants here. + ASSERT(var == NULL || var->mode() != Variable::CONST); + ASSERT_NE(Token::INIT_CONST, node->op()); + if (is_trivial_receiver) { + Result value = frame()->Pop(); + frame()->Push(prop->obj()); + frame()->Push(&value); + } + CodeForSourcePosition(node->position()); + bool is_contextual = (var != NULL); + Result answer = EmitNamedStore(name, is_contextual); + frame()->Push(&answer); + + // Stack layout: + // [tos] : result + // [tos+1] : receiver if at the end of an initialization block + + if (node->ends_initialization_block()) { + ASSERT_EQ(NULL, var); + // The argument to the runtime call is the receiver. + if (is_trivial_receiver) { + frame()->Push(prop->obj()); + } else { + // A copy of the receiver is below the value of the assignment. Swap + // the receiver and the value of the assignment expression. + Result result = frame()->Pop(); + Result receiver = frame()->Pop(); + frame()->Push(&result); + frame()->Push(&receiver); + } + Result ignored = frame_->CallRuntime(Runtime::kToFastProperties, 1); + } + + // Stack layout: + // [tos] : result + + ASSERT_EQ(frame()->height(), original_height + 1); +} + + +void CodeGenerator::EmitKeyedPropertyAssignment(Assignment* node) { +#ifdef DEBUG + int original_height = frame()->height(); +#endif + Comment cmnt(masm_, "[ Keyed Property Assignment"); + Property* prop = node->target()->AsProperty(); + ASSERT_NOT_NULL(prop); + + // Evaluate the receiver subexpression. + Load(prop->obj()); + + // Change to slow case in the beginning of an initialization block to + // avoid the quadratic behavior of repeatedly adding fast properties. + if (node->starts_initialization_block()) { + frame_->Dup(); + Result ignored = frame_->CallRuntime(Runtime::kToSlowProperties, 1); + } + + // Change to fast case at the end of an initialization block. To prepare for + // that add an extra copy of the receiver to the frame, so that it can be + // converted back to fast case after the assignment. + if (node->ends_initialization_block()) { + frame_->Dup(); + } + + // Evaluate the key subexpression. + Load(prop->key()); + + // Stack layout: + // [tos] : key + // [tos+1] : receiver + // [tos+2] : receiver if at the end of an initialization block + + // Evaluate the right-hand side. + if (node->is_compound()) { + // For a compound assignment the right-hand side is a binary operation + // between the current property value and the actual right-hand side. + // Duplicate receiver and key for loading the current property value. + frame()->PushElementAt(1); + frame()->PushElementAt(1); + Result value = EmitKeyedLoad(); + frame()->Push(&value); + Load(node->value()); + + // Perform the binary operation. + bool overwrite_value = node->value()->ResultOverwriteAllowed(); + BinaryOperation expr(node); + GenericBinaryOperation(&expr, + overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE); + } else { + // For non-compound assignment just load the right-hand side. + Load(node->value()); + } + + // Stack layout: + // [tos] : value + // [tos+1] : key + // [tos+2] : receiver + // [tos+3] : receiver if at the end of an initialization block + + // Perform the assignment. It is safe to ignore constants here. + ASSERT(node->op() != Token::INIT_CONST); + CodeForSourcePosition(node->position()); + Result answer = EmitKeyedStore(prop->key()->type()); + frame()->Push(&answer); + + // Stack layout: + // [tos] : result + // [tos+1] : receiver if at the end of an initialization block + + // Change to fast case at the end of an initialization block. + if (node->ends_initialization_block()) { + // The argument to the runtime call is the extra copy of the receiver, + // which is below the value of the assignment. Swap the receiver and + // the value of the assignment expression. + Result result = frame()->Pop(); + Result receiver = frame()->Pop(); + frame()->Push(&result); + frame()->Push(&receiver); + Result ignored = frame_->CallRuntime(Runtime::kToFastProperties, 1); + } + + // Stack layout: + // [tos] : result + + ASSERT(frame()->height() == original_height + 1); +} + + +void CodeGenerator::VisitAssignment(Assignment* node) { + ASSERT(!in_safe_int32_mode()); +#ifdef DEBUG + int original_height = frame()->height(); +#endif + Variable* var = node->target()->AsVariableProxy()->AsVariable(); + Property* prop = node->target()->AsProperty(); + + if (var != NULL && !var->is_global()) { + EmitSlotAssignment(node); + + } else if ((prop != NULL && prop->key()->IsPropertyName()) || + (var != NULL && var->is_global())) { + // Properties whose keys are property names and global variables are + // treated as named property references. We do not need to consider + // global 'this' because it is not a valid left-hand side. + EmitNamedPropertyAssignment(node); + + } else if (prop != NULL) { + // Other properties (including rewritten parameters for a function that + // uses arguments) are keyed property assignments. + EmitKeyedPropertyAssignment(node); + + } else { + // Invalid left-hand side. + Load(node->target()); + Result result = frame()->CallRuntime(Runtime::kThrowReferenceError, 1); + // The runtime call doesn't actually return but the code generator will + // still generate code and expects a certain frame height. + frame()->Push(&result); + } + + ASSERT(frame()->height() == original_height + 1); +} + + +void CodeGenerator::VisitThrow(Throw* node) { + ASSERT(!in_safe_int32_mode()); + Comment cmnt(masm_, "[ Throw"); + Load(node->exception()); + Result result = frame_->CallRuntime(Runtime::kThrow, 1); + frame_->Push(&result); +} + + +void CodeGenerator::VisitProperty(Property* node) { + ASSERT(!in_safe_int32_mode()); + Comment cmnt(masm_, "[ Property"); + Reference property(this, node); + property.GetValue(); +} + + +void CodeGenerator::VisitCall(Call* node) { + ASSERT(!in_safe_int32_mode()); + Comment cmnt(masm_, "[ Call"); + + Expression* function = node->expression(); + ZoneList<Expression*>* args = node->arguments(); + + // Check if the function is a variable or a property. + Variable* var = function->AsVariableProxy()->AsVariable(); + Property* property = function->AsProperty(); + + // ------------------------------------------------------------------------ + // Fast-case: Use inline caching. + // --- + // According to ECMA-262, section 11.2.3, page 44, the function to call + // must be resolved after the arguments have been evaluated. The IC code + // automatically handles this by loading the arguments before the function + // is resolved in cache misses (this also holds for megamorphic calls). + // ------------------------------------------------------------------------ + + if (var != NULL && var->is_possibly_eval()) { + // ---------------------------------- + // JavaScript example: 'eval(arg)' // eval is not known to be shadowed + // ---------------------------------- + + // In a call to eval, we first call %ResolvePossiblyDirectEval to + // resolve the function we need to call and the receiver of the + // call. Then we call the resolved function using the given + // arguments. + + // Prepare the stack for the call to the resolved function. + Load(function); + + // Allocate a frame slot for the receiver. + frame_->Push(FACTORY->undefined_value()); + + // Load the arguments. + int arg_count = args->length(); + for (int i = 0; i < arg_count; i++) { + Load(args->at(i)); + frame_->SpillTop(); + } + + // Result to hold the result of the function resolution and the + // final result of the eval call. + Result result; + + // If we know that eval can only be shadowed by eval-introduced + // variables we attempt to load the global eval function directly + // in generated code. If we succeed, there is no need to perform a + // context lookup in the runtime system. + JumpTarget done; + if (var->AsSlot() != NULL && var->mode() == Variable::DYNAMIC_GLOBAL) { + ASSERT(var->AsSlot()->type() == Slot::LOOKUP); + JumpTarget slow; + // Prepare the stack for the call to + // ResolvePossiblyDirectEvalNoLookup by pushing the loaded + // function, the first argument to the eval call and the + // receiver. + Result fun = LoadFromGlobalSlotCheckExtensions(var->AsSlot(), + NOT_INSIDE_TYPEOF, + &slow); + frame_->Push(&fun); + if (arg_count > 0) { + frame_->PushElementAt(arg_count); + } else { + frame_->Push(FACTORY->undefined_value()); + } + frame_->PushParameterAt(-1); + + // Push the strict mode flag. + frame_->Push(Smi::FromInt(strict_mode_flag())); + + // Resolve the call. + result = + frame_->CallRuntime(Runtime::kResolvePossiblyDirectEvalNoLookup, 4); + + done.Jump(&result); + slow.Bind(); + } + + // Prepare the stack for the call to ResolvePossiblyDirectEval by + // pushing the loaded function, the first argument to the eval + // call and the receiver. + frame_->PushElementAt(arg_count + 1); + if (arg_count > 0) { + frame_->PushElementAt(arg_count); + } else { + frame_->Push(FACTORY->undefined_value()); + } + frame_->PushParameterAt(-1); + + // Push the strict mode flag. + frame_->Push(Smi::FromInt(strict_mode_flag())); + + // Resolve the call. + result = frame_->CallRuntime(Runtime::kResolvePossiblyDirectEval, 4); + + // If we generated fast-case code bind the jump-target where fast + // and slow case merge. + if (done.is_linked()) done.Bind(&result); + + // The runtime call returns a pair of values in eax (function) and + // edx (receiver). Touch up the stack with the right values. + Result receiver = allocator_->Allocate(edx); + frame_->SetElementAt(arg_count + 1, &result); + frame_->SetElementAt(arg_count, &receiver); + receiver.Unuse(); + + // Call the function. + CodeForSourcePosition(node->position()); + InLoopFlag in_loop = loop_nesting() > 0 ? IN_LOOP : NOT_IN_LOOP; + CallFunctionStub call_function(arg_count, in_loop, RECEIVER_MIGHT_BE_VALUE); + result = frame_->CallStub(&call_function, arg_count + 1); + + // Restore the context and overwrite the function on the stack with + // the result. + frame_->RestoreContextRegister(); + frame_->SetElementAt(0, &result); + + } else if (var != NULL && !var->is_this() && var->is_global()) { + // ---------------------------------- + // JavaScript example: 'foo(1, 2, 3)' // foo is global + // ---------------------------------- + + // Pass the global object as the receiver and let the IC stub + // patch the stack to use the global proxy as 'this' in the + // invoked function. + LoadGlobal(); + + // Load the arguments. + int arg_count = args->length(); + for (int i = 0; i < arg_count; i++) { + Load(args->at(i)); + frame_->SpillTop(); + } + + // Push the name of the function onto the frame. + frame_->Push(var->name()); + + // Call the IC initialization code. + CodeForSourcePosition(node->position()); + Result result = frame_->CallCallIC(RelocInfo::CODE_TARGET_CONTEXT, + arg_count, + loop_nesting()); + frame_->RestoreContextRegister(); + frame_->Push(&result); + + } else if (var != NULL && var->AsSlot() != NULL && + var->AsSlot()->type() == Slot::LOOKUP) { + // ---------------------------------- + // JavaScript examples: + // + // with (obj) foo(1, 2, 3) // foo may be in obj. + // + // function f() {}; + // function g() { + // eval(...); + // f(); // f could be in extension object. + // } + // ---------------------------------- + + JumpTarget slow, done; + Result function; + + // Generate fast case for loading functions from slots that + // correspond to local/global variables or arguments unless they + // are shadowed by eval-introduced bindings. + EmitDynamicLoadFromSlotFastCase(var->AsSlot(), + NOT_INSIDE_TYPEOF, + &function, + &slow, + &done); + + slow.Bind(); + // Enter the runtime system to load the function from the context. + // Sync the frame so we can push the arguments directly into + // place. + frame_->SyncRange(0, frame_->element_count() - 1); + frame_->EmitPush(esi); + frame_->EmitPush(Immediate(var->name())); + frame_->CallRuntime(Runtime::kLoadContextSlot, 2); + // The runtime call returns a pair of values in eax and edx. The + // looked-up function is in eax and the receiver is in edx. These + // register references are not ref counted here. We spill them + // eagerly since they are arguments to an inevitable call (and are + // not sharable by the arguments). + ASSERT(!allocator()->is_used(eax)); + frame_->EmitPush(eax); + + // Load the receiver. + ASSERT(!allocator()->is_used(edx)); + frame_->EmitPush(edx); + + // If fast case code has been generated, emit code to push the + // function and receiver and have the slow path jump around this + // code. + if (done.is_linked()) { + JumpTarget call; + call.Jump(); + done.Bind(&function); + frame_->Push(&function); + LoadGlobalReceiver(); + call.Bind(); + } + + // Call the function. + CallWithArguments(args, NO_CALL_FUNCTION_FLAGS, node->position()); + + } else if (property != NULL) { + // Check if the key is a literal string. + Literal* literal = property->key()->AsLiteral(); + + if (literal != NULL && literal->handle()->IsSymbol()) { + // ------------------------------------------------------------------ + // JavaScript example: 'object.foo(1, 2, 3)' or 'map["key"](1, 2, 3)' + // ------------------------------------------------------------------ + + Handle<String> name = Handle<String>::cast(literal->handle()); + + if (ArgumentsMode() == LAZY_ARGUMENTS_ALLOCATION && + name->IsEqualTo(CStrVector("apply")) && + args->length() == 2 && + args->at(1)->AsVariableProxy() != NULL && + args->at(1)->AsVariableProxy()->IsArguments()) { + // Use the optimized Function.prototype.apply that avoids + // allocating lazily allocated arguments objects. + CallApplyLazy(property->obj(), + args->at(0), + args->at(1)->AsVariableProxy(), + node->position()); + + } else { + // Push the receiver onto the frame. + Load(property->obj()); + + // Load the arguments. + int arg_count = args->length(); + for (int i = 0; i < arg_count; i++) { + Load(args->at(i)); + frame_->SpillTop(); + } + + // Push the name of the function onto the frame. + frame_->Push(name); + + // Call the IC initialization code. + CodeForSourcePosition(node->position()); + Result result = + frame_->CallCallIC(RelocInfo::CODE_TARGET, arg_count, + loop_nesting()); + frame_->RestoreContextRegister(); + frame_->Push(&result); + } + + } else { + // ------------------------------------------- + // JavaScript example: 'array[index](1, 2, 3)' + // ------------------------------------------- + + // Load the function to call from the property through a reference. + + // Pass receiver to called function. + if (property->is_synthetic()) { + Reference ref(this, property); + ref.GetValue(); + // Use global object as receiver. + LoadGlobalReceiver(); + // Call the function. + CallWithArguments(args, RECEIVER_MIGHT_BE_VALUE, node->position()); + } else { + // Push the receiver onto the frame. + Load(property->obj()); + + // Load the name of the function. + Load(property->key()); + + // Swap the name of the function and the receiver on the stack to follow + // the calling convention for call ICs. + Result key = frame_->Pop(); + Result receiver = frame_->Pop(); + frame_->Push(&key); + frame_->Push(&receiver); + key.Unuse(); + receiver.Unuse(); + + // Load the arguments. + int arg_count = args->length(); + for (int i = 0; i < arg_count; i++) { + Load(args->at(i)); + frame_->SpillTop(); + } + + // Place the key on top of stack and call the IC initialization code. + frame_->PushElementAt(arg_count + 1); + CodeForSourcePosition(node->position()); + Result result = + frame_->CallKeyedCallIC(RelocInfo::CODE_TARGET, + arg_count, + loop_nesting()); + frame_->Drop(); // Drop the key still on the stack. + frame_->RestoreContextRegister(); + frame_->Push(&result); + } + } + + } else { + // ---------------------------------- + // JavaScript example: 'foo(1, 2, 3)' // foo is not global + // ---------------------------------- + + // Load the function. + Load(function); + + // Pass the global proxy as the receiver. + LoadGlobalReceiver(); + + // Call the function. + CallWithArguments(args, NO_CALL_FUNCTION_FLAGS, node->position()); + } +} + + +void CodeGenerator::VisitCallNew(CallNew* node) { + ASSERT(!in_safe_int32_mode()); + Comment cmnt(masm_, "[ CallNew"); + + // According to ECMA-262, section 11.2.2, page 44, the function + // expression in new calls must be evaluated before the + // arguments. This is different from ordinary calls, where the + // actual function to call is resolved after the arguments have been + // evaluated. + + // Push constructor on the stack. If it's not a function it's used as + // receiver for CALL_NON_FUNCTION, otherwise the value on the stack is + // ignored. + Load(node->expression()); + + // Push the arguments ("left-to-right") on the stack. + ZoneList<Expression*>* args = node->arguments(); + int arg_count = args->length(); + for (int i = 0; i < arg_count; i++) { + Load(args->at(i)); + } + + // Call the construct call builtin that handles allocation and + // constructor invocation. + CodeForSourcePosition(node->position()); + Result result = frame_->CallConstructor(arg_count); + frame_->Push(&result); +} + + +void CodeGenerator::GenerateIsSmi(ZoneList<Expression*>* args) { + ASSERT(args->length() == 1); + Load(args->at(0)); + Result value = frame_->Pop(); + value.ToRegister(); + ASSERT(value.is_valid()); + __ test(value.reg(), Immediate(kSmiTagMask)); + value.Unuse(); + destination()->Split(zero); +} + + +void CodeGenerator::GenerateLog(ZoneList<Expression*>* args) { + // Conditionally generate a log call. + // Args: + // 0 (literal string): The type of logging (corresponds to the flags). + // This is used to determine whether or not to generate the log call. + // 1 (string): Format string. Access the string at argument index 2 + // with '%2s' (see Logger::LogRuntime for all the formats). + // 2 (array): Arguments to the format string. + ASSERT_EQ(args->length(), 3); +#ifdef ENABLE_LOGGING_AND_PROFILING + if (ShouldGenerateLog(args->at(0))) { + Load(args->at(1)); + Load(args->at(2)); + frame_->CallRuntime(Runtime::kLog, 2); + } +#endif + // Finally, we're expected to leave a value on the top of the stack. + frame_->Push(FACTORY->undefined_value()); +} + + +void CodeGenerator::GenerateIsNonNegativeSmi(ZoneList<Expression*>* args) { + ASSERT(args->length() == 1); + Load(args->at(0)); + Result value = frame_->Pop(); + value.ToRegister(); + ASSERT(value.is_valid()); + __ test(value.reg(), Immediate(kSmiTagMask | kSmiSignMask)); + value.Unuse(); + destination()->Split(zero); +} + + +class DeferredStringCharCodeAt : public DeferredCode { + public: + DeferredStringCharCodeAt(Register object, + Register index, + Register scratch, + Register result) + : result_(result), + char_code_at_generator_(object, + index, + scratch, + result, + &need_conversion_, + &need_conversion_, + &index_out_of_range_, + STRING_INDEX_IS_NUMBER) {} + + StringCharCodeAtGenerator* fast_case_generator() { + return &char_code_at_generator_; + } + + virtual void Generate() { + VirtualFrameRuntimeCallHelper call_helper(frame_state()); + char_code_at_generator_.GenerateSlow(masm(), call_helper); + + __ bind(&need_conversion_); + // Move the undefined value into the result register, which will + // trigger conversion. + __ Set(result_, Immediate(FACTORY->undefined_value())); + __ jmp(exit_label()); + + __ bind(&index_out_of_range_); + // When the index is out of range, the spec requires us to return + // NaN. + __ Set(result_, Immediate(FACTORY->nan_value())); + __ jmp(exit_label()); + } + + private: + Register result_; + + Label need_conversion_; + Label index_out_of_range_; + + StringCharCodeAtGenerator char_code_at_generator_; +}; + + +// This generates code that performs a String.prototype.charCodeAt() call +// or returns a smi in order to trigger conversion. +void CodeGenerator::GenerateStringCharCodeAt(ZoneList<Expression*>* args) { + Comment(masm_, "[ GenerateStringCharCodeAt"); + ASSERT(args->length() == 2); + + Load(args->at(0)); + Load(args->at(1)); + Result index = frame_->Pop(); + Result object = frame_->Pop(); + object.ToRegister(); + index.ToRegister(); + // We might mutate the object register. + frame_->Spill(object.reg()); + + // We need two extra registers. + Result result = allocator()->Allocate(); + ASSERT(result.is_valid()); + Result scratch = allocator()->Allocate(); + ASSERT(scratch.is_valid()); + + DeferredStringCharCodeAt* deferred = + new DeferredStringCharCodeAt(object.reg(), + index.reg(), + scratch.reg(), + result.reg()); + deferred->fast_case_generator()->GenerateFast(masm_); + deferred->BindExit(); + frame_->Push(&result); +} + + +class DeferredStringCharFromCode : public DeferredCode { + public: + DeferredStringCharFromCode(Register code, + Register result) + : char_from_code_generator_(code, result) {} + + StringCharFromCodeGenerator* fast_case_generator() { + return &char_from_code_generator_; + } + + virtual void Generate() { + VirtualFrameRuntimeCallHelper call_helper(frame_state()); + char_from_code_generator_.GenerateSlow(masm(), call_helper); + } + + private: + StringCharFromCodeGenerator char_from_code_generator_; +}; + + +// Generates code for creating a one-char string from a char code. +void CodeGenerator::GenerateStringCharFromCode(ZoneList<Expression*>* args) { + Comment(masm_, "[ GenerateStringCharFromCode"); + ASSERT(args->length() == 1); + + Load(args->at(0)); + + Result code = frame_->Pop(); + code.ToRegister(); + ASSERT(code.is_valid()); + + Result result = allocator()->Allocate(); + ASSERT(result.is_valid()); + + DeferredStringCharFromCode* deferred = new DeferredStringCharFromCode( + code.reg(), result.reg()); + deferred->fast_case_generator()->GenerateFast(masm_); + deferred->BindExit(); + frame_->Push(&result); +} + + +class DeferredStringCharAt : public DeferredCode { + public: + DeferredStringCharAt(Register object, + Register index, + Register scratch1, + Register scratch2, + Register result) + : result_(result), + char_at_generator_(object, + index, + scratch1, + scratch2, + result, + &need_conversion_, + &need_conversion_, + &index_out_of_range_, + STRING_INDEX_IS_NUMBER) {} + + StringCharAtGenerator* fast_case_generator() { + return &char_at_generator_; + } + + virtual void Generate() { + VirtualFrameRuntimeCallHelper call_helper(frame_state()); + char_at_generator_.GenerateSlow(masm(), call_helper); + + __ bind(&need_conversion_); + // Move smi zero into the result register, which will trigger + // conversion. + __ Set(result_, Immediate(Smi::FromInt(0))); + __ jmp(exit_label()); + + __ bind(&index_out_of_range_); + // When the index is out of range, the spec requires us to return + // the empty string. + __ Set(result_, Immediate(FACTORY->empty_string())); + __ jmp(exit_label()); + } + + private: + Register result_; + + Label need_conversion_; + Label index_out_of_range_; + + StringCharAtGenerator char_at_generator_; +}; + + +// This generates code that performs a String.prototype.charAt() call +// or returns a smi in order to trigger conversion. +void CodeGenerator::GenerateStringCharAt(ZoneList<Expression*>* args) { + Comment(masm_, "[ GenerateStringCharAt"); + ASSERT(args->length() == 2); + + Load(args->at(0)); + Load(args->at(1)); + Result index = frame_->Pop(); + Result object = frame_->Pop(); + object.ToRegister(); + index.ToRegister(); + // We might mutate the object register. + frame_->Spill(object.reg()); + + // We need three extra registers. + Result result = allocator()->Allocate(); + ASSERT(result.is_valid()); + Result scratch1 = allocator()->Allocate(); + ASSERT(scratch1.is_valid()); + Result scratch2 = allocator()->Allocate(); + ASSERT(scratch2.is_valid()); + + DeferredStringCharAt* deferred = + new DeferredStringCharAt(object.reg(), + index.reg(), + scratch1.reg(), + scratch2.reg(), + result.reg()); + deferred->fast_case_generator()->GenerateFast(masm_); + deferred->BindExit(); + frame_->Push(&result); +} + + +void CodeGenerator::GenerateIsArray(ZoneList<Expression*>* args) { + ASSERT(args->length() == 1); + Load(args->at(0)); + Result value = frame_->Pop(); + value.ToRegister(); + ASSERT(value.is_valid()); + __ test(value.reg(), Immediate(kSmiTagMask)); + destination()->false_target()->Branch(equal); + // It is a heap object - get map. + Result temp = allocator()->Allocate(); + ASSERT(temp.is_valid()); + // Check if the object is a JS array or not. + __ CmpObjectType(value.reg(), JS_ARRAY_TYPE, temp.reg()); + value.Unuse(); + temp.Unuse(); + destination()->Split(equal); +} + + +void CodeGenerator::GenerateFastAsciiArrayJoin(ZoneList<Expression*>* args) { + Label bailout, done, one_char_separator, long_separator, + non_trivial_array, not_size_one_array, loop, loop_condition, + loop_1, loop_1_condition, loop_2, loop_2_entry, loop_3, loop_3_entry; + + ASSERT(args->length() == 2); + // We will leave the separator on the stack until the end of the function. + Load(args->at(1)); + // Load this to eax (= array) + Load(args->at(0)); + Result array_result = frame_->Pop(); + array_result.ToRegister(eax); + frame_->SpillAll(); + + // All aliases of the same register have disjoint lifetimes. + Register array = eax; + Register elements = no_reg; // Will be eax. + + Register index = edx; + + Register string_length = ecx; + + Register string = esi; + + Register scratch = ebx; + + Register array_length = edi; + Register result_pos = no_reg; // Will be edi. + + // Separator operand is already pushed. + Operand separator_operand = Operand(esp, 2 * kPointerSize); + Operand result_operand = Operand(esp, 1 * kPointerSize); + Operand array_length_operand = Operand(esp, 0); + __ sub(Operand(esp), Immediate(2 * kPointerSize)); + __ cld(); + // Check that the array is a JSArray + __ test(array, Immediate(kSmiTagMask)); + __ j(zero, &bailout); + __ CmpObjectType(array, JS_ARRAY_TYPE, scratch); + __ j(not_equal, &bailout); + + // Check that the array has fast elements. + __ test_b(FieldOperand(scratch, Map::kBitField2Offset), + 1 << Map::kHasFastElements); + __ j(zero, &bailout); + + // If the array has length zero, return the empty string. + __ mov(array_length, FieldOperand(array, JSArray::kLengthOffset)); + __ sar(array_length, 1); + __ j(not_zero, &non_trivial_array); + __ mov(result_operand, FACTORY->empty_string()); + __ jmp(&done); + + // Save the array length. + __ bind(&non_trivial_array); + __ mov(array_length_operand, array_length); + + // Save the FixedArray containing array's elements. + // End of array's live range. + elements = array; + __ mov(elements, FieldOperand(array, JSArray::kElementsOffset)); + array = no_reg; + + + // Check that all array elements are sequential ASCII strings, and + // accumulate the sum of their lengths, as a smi-encoded value. + __ Set(index, Immediate(0)); + __ Set(string_length, Immediate(0)); + // Loop condition: while (index < length). + // Live loop registers: index, array_length, string, + // scratch, string_length, elements. + __ jmp(&loop_condition); + __ bind(&loop); + __ cmp(index, Operand(array_length)); + __ j(greater_equal, &done); + + __ mov(string, FieldOperand(elements, index, + times_pointer_size, + FixedArray::kHeaderSize)); + __ test(string, Immediate(kSmiTagMask)); + __ j(zero, &bailout); + __ mov(scratch, FieldOperand(string, HeapObject::kMapOffset)); + __ movzx_b(scratch, FieldOperand(scratch, Map::kInstanceTypeOffset)); + __ and_(scratch, Immediate( + kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask)); + __ cmp(scratch, kStringTag | kAsciiStringTag | kSeqStringTag); + __ j(not_equal, &bailout); + __ add(string_length, + FieldOperand(string, SeqAsciiString::kLengthOffset)); + __ j(overflow, &bailout); + __ add(Operand(index), Immediate(1)); + __ bind(&loop_condition); + __ cmp(index, Operand(array_length)); + __ j(less, &loop); + + // If array_length is 1, return elements[0], a string. + __ cmp(array_length, 1); + __ j(not_equal, ¬_size_one_array); + __ mov(scratch, FieldOperand(elements, FixedArray::kHeaderSize)); + __ mov(result_operand, scratch); + __ jmp(&done); + + __ bind(¬_size_one_array); + + // End of array_length live range. + result_pos = array_length; + array_length = no_reg; + + // Live registers: + // string_length: Sum of string lengths, as a smi. + // elements: FixedArray of strings. + + // Check that the separator is a flat ASCII string. + __ mov(string, separator_operand); + __ test(string, Immediate(kSmiTagMask)); + __ j(zero, &bailout); + __ mov(scratch, FieldOperand(string, HeapObject::kMapOffset)); + __ movzx_b(scratch, FieldOperand(scratch, Map::kInstanceTypeOffset)); + __ and_(scratch, Immediate( + kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask)); + __ cmp(scratch, kStringTag | kAsciiStringTag | kSeqStringTag); + __ j(not_equal, &bailout); + + // Add (separator length times array_length) - separator length + // to string_length. + __ mov(scratch, separator_operand); + __ mov(scratch, FieldOperand(scratch, SeqAsciiString::kLengthOffset)); + __ sub(string_length, Operand(scratch)); // May be negative, temporarily. + __ imul(scratch, array_length_operand); + __ j(overflow, &bailout); + __ add(string_length, Operand(scratch)); + __ j(overflow, &bailout); + + __ shr(string_length, 1); + // Live registers and stack values: + // string_length + // elements + __ AllocateAsciiString(result_pos, string_length, scratch, + index, string, &bailout); + __ mov(result_operand, result_pos); + __ lea(result_pos, FieldOperand(result_pos, SeqAsciiString::kHeaderSize)); + + + __ mov(string, separator_operand); + __ cmp(FieldOperand(string, SeqAsciiString::kLengthOffset), + Immediate(Smi::FromInt(1))); + __ j(equal, &one_char_separator); + __ j(greater, &long_separator); + + + // Empty separator case + __ mov(index, Immediate(0)); + __ jmp(&loop_1_condition); + // Loop condition: while (index < length). + __ bind(&loop_1); + // Each iteration of the loop concatenates one string to the result. + // Live values in registers: + // index: which element of the elements array we are adding to the result. + // result_pos: the position to which we are currently copying characters. + // elements: the FixedArray of strings we are joining. + + // Get string = array[index]. + __ mov(string, FieldOperand(elements, index, + times_pointer_size, + FixedArray::kHeaderSize)); + __ mov(string_length, + FieldOperand(string, String::kLengthOffset)); + __ shr(string_length, 1); + __ lea(string, + FieldOperand(string, SeqAsciiString::kHeaderSize)); + __ CopyBytes(string, result_pos, string_length, scratch); + __ add(Operand(index), Immediate(1)); + __ bind(&loop_1_condition); + __ cmp(index, array_length_operand); + __ j(less, &loop_1); // End while (index < length). + __ jmp(&done); + + + + // One-character separator case + __ bind(&one_char_separator); + // Replace separator with its ascii character value. + __ mov_b(scratch, FieldOperand(string, SeqAsciiString::kHeaderSize)); + __ mov_b(separator_operand, scratch); + + __ Set(index, Immediate(0)); + // Jump into the loop after the code that copies the separator, so the first + // element is not preceded by a separator + __ jmp(&loop_2_entry); + // Loop condition: while (index < length). + __ bind(&loop_2); + // Each iteration of the loop concatenates one string to the result. + // Live values in registers: + // index: which element of the elements array we are adding to the result. + // result_pos: the position to which we are currently copying characters. + + // Copy the separator character to the result. + __ mov_b(scratch, separator_operand); + __ mov_b(Operand(result_pos, 0), scratch); + __ inc(result_pos); + + __ bind(&loop_2_entry); + // Get string = array[index]. + __ mov(string, FieldOperand(elements, index, + times_pointer_size, + FixedArray::kHeaderSize)); + __ mov(string_length, + FieldOperand(string, String::kLengthOffset)); + __ shr(string_length, 1); + __ lea(string, + FieldOperand(string, SeqAsciiString::kHeaderSize)); + __ CopyBytes(string, result_pos, string_length, scratch); + __ add(Operand(index), Immediate(1)); + + __ cmp(index, array_length_operand); + __ j(less, &loop_2); // End while (index < length). + __ jmp(&done); + + + // Long separator case (separator is more than one character). + __ bind(&long_separator); + + __ Set(index, Immediate(0)); + // Jump into the loop after the code that copies the separator, so the first + // element is not preceded by a separator + __ jmp(&loop_3_entry); + // Loop condition: while (index < length). + __ bind(&loop_3); + // Each iteration of the loop concatenates one string to the result. + // Live values in registers: + // index: which element of the elements array we are adding to the result. + // result_pos: the position to which we are currently copying characters. + + // Copy the separator to the result. + __ mov(string, separator_operand); + __ mov(string_length, + FieldOperand(string, String::kLengthOffset)); + __ shr(string_length, 1); + __ lea(string, + FieldOperand(string, SeqAsciiString::kHeaderSize)); + __ CopyBytes(string, result_pos, string_length, scratch); + + __ bind(&loop_3_entry); + // Get string = array[index]. + __ mov(string, FieldOperand(elements, index, + times_pointer_size, + FixedArray::kHeaderSize)); + __ mov(string_length, + FieldOperand(string, String::kLengthOffset)); + __ shr(string_length, 1); + __ lea(string, + FieldOperand(string, SeqAsciiString::kHeaderSize)); + __ CopyBytes(string, result_pos, string_length, scratch); + __ add(Operand(index), Immediate(1)); + + __ cmp(index, array_length_operand); + __ j(less, &loop_3); // End while (index < length). + __ jmp(&done); + + + __ bind(&bailout); + __ mov(result_operand, FACTORY->undefined_value()); + __ bind(&done); + __ mov(eax, result_operand); + // Drop temp values from the stack, and restore context register. + __ add(Operand(esp), Immediate(2 * kPointerSize)); + + __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset)); + frame_->Drop(1); + frame_->Push(&array_result); +} + + +void CodeGenerator::GenerateIsRegExp(ZoneList<Expression*>* args) { + ASSERT(args->length() == 1); + Load(args->at(0)); + Result value = frame_->Pop(); + value.ToRegister(); + ASSERT(value.is_valid()); + __ test(value.reg(), Immediate(kSmiTagMask)); + destination()->false_target()->Branch(equal); + // It is a heap object - get map. + Result temp = allocator()->Allocate(); + ASSERT(temp.is_valid()); + // Check if the object is a regexp. + __ CmpObjectType(value.reg(), JS_REGEXP_TYPE, temp.reg()); + value.Unuse(); + temp.Unuse(); + destination()->Split(equal); +} + + +void CodeGenerator::GenerateIsObject(ZoneList<Expression*>* args) { + // This generates a fast version of: + // (typeof(arg) === 'object' || %_ClassOf(arg) == 'RegExp') + ASSERT(args->length() == 1); + Load(args->at(0)); + Result obj = frame_->Pop(); + obj.ToRegister(); + + __ test(obj.reg(), Immediate(kSmiTagMask)); + destination()->false_target()->Branch(zero); + __ cmp(obj.reg(), FACTORY->null_value()); + destination()->true_target()->Branch(equal); + + Result map = allocator()->Allocate(); + ASSERT(map.is_valid()); + __ mov(map.reg(), FieldOperand(obj.reg(), HeapObject::kMapOffset)); + // Undetectable objects behave like undefined when tested with typeof. + __ test_b(FieldOperand(map.reg(), Map::kBitFieldOffset), + 1 << Map::kIsUndetectable); + destination()->false_target()->Branch(not_zero); + // Do a range test for JSObject type. We can't use + // MacroAssembler::IsInstanceJSObjectType, because we are using a + // ControlDestination, so we copy its implementation here. + __ movzx_b(map.reg(), FieldOperand(map.reg(), Map::kInstanceTypeOffset)); + __ sub(Operand(map.reg()), Immediate(FIRST_JS_OBJECT_TYPE)); + __ cmp(map.reg(), LAST_JS_OBJECT_TYPE - FIRST_JS_OBJECT_TYPE); + obj.Unuse(); + map.Unuse(); + destination()->Split(below_equal); +} + + +void CodeGenerator::GenerateIsSpecObject(ZoneList<Expression*>* args) { + // This generates a fast version of: + // (typeof(arg) === 'object' || %_ClassOf(arg) == 'RegExp' || + // typeof(arg) == function). + // It includes undetectable objects (as opposed to IsObject). + ASSERT(args->length() == 1); + Load(args->at(0)); + Result value = frame_->Pop(); + value.ToRegister(); + ASSERT(value.is_valid()); + __ test(value.reg(), Immediate(kSmiTagMask)); + destination()->false_target()->Branch(equal); + + // Check that this is an object. + frame_->Spill(value.reg()); + __ CmpObjectType(value.reg(), FIRST_JS_OBJECT_TYPE, value.reg()); + value.Unuse(); + destination()->Split(above_equal); +} + + +// Deferred code to check whether the String JavaScript object is safe for using +// default value of. This code is called after the bit caching this information +// in the map has been checked with the map for the object in the map_result_ +// register. On return the register map_result_ contains 1 for true and 0 for +// false. +class DeferredIsStringWrapperSafeForDefaultValueOf : public DeferredCode { + public: + DeferredIsStringWrapperSafeForDefaultValueOf(Register object, + Register map_result, + Register scratch1, + Register scratch2) + : object_(object), + map_result_(map_result), + scratch1_(scratch1), + scratch2_(scratch2) { } + + virtual void Generate() { + Label false_result; + + // Check that map is loaded as expected. + if (FLAG_debug_code) { + __ cmp(map_result_, FieldOperand(object_, HeapObject::kMapOffset)); + __ Assert(equal, "Map not in expected register"); + } + + // Check for fast case object. Generate false result for slow case object. + __ mov(scratch1_, FieldOperand(object_, JSObject::kPropertiesOffset)); + __ mov(scratch1_, FieldOperand(scratch1_, HeapObject::kMapOffset)); + __ cmp(scratch1_, FACTORY->hash_table_map()); + __ j(equal, &false_result); + + // Look for valueOf symbol in the descriptor array, and indicate false if + // found. The type is not checked, so if it is a transition it is a false + // negative. + __ mov(map_result_, + FieldOperand(map_result_, Map::kInstanceDescriptorsOffset)); + __ mov(scratch1_, FieldOperand(map_result_, FixedArray::kLengthOffset)); + // map_result_: descriptor array + // scratch1_: length of descriptor array + // Calculate the end of the descriptor array. + STATIC_ASSERT(kSmiTag == 0); + STATIC_ASSERT(kSmiTagSize == 1); + STATIC_ASSERT(kPointerSize == 4); + __ lea(scratch1_, + Operand(map_result_, scratch1_, times_2, FixedArray::kHeaderSize)); + // Calculate location of the first key name. + __ add(Operand(map_result_), + Immediate(FixedArray::kHeaderSize + + DescriptorArray::kFirstIndex * kPointerSize)); + // Loop through all the keys in the descriptor array. If one of these is the + // symbol valueOf the result is false. + Label entry, loop; + __ jmp(&entry); + __ bind(&loop); + __ mov(scratch2_, FieldOperand(map_result_, 0)); + __ cmp(scratch2_, FACTORY->value_of_symbol()); + __ j(equal, &false_result); + __ add(Operand(map_result_), Immediate(kPointerSize)); + __ bind(&entry); + __ cmp(map_result_, Operand(scratch1_)); + __ j(not_equal, &loop); + + // Reload map as register map_result_ was used as temporary above. + __ mov(map_result_, FieldOperand(object_, HeapObject::kMapOffset)); + + // If a valueOf property is not found on the object check that it's + // prototype is the un-modified String prototype. If not result is false. + __ mov(scratch1_, FieldOperand(map_result_, Map::kPrototypeOffset)); + __ test(scratch1_, Immediate(kSmiTagMask)); + __ j(zero, &false_result); + __ mov(scratch1_, FieldOperand(scratch1_, HeapObject::kMapOffset)); + __ mov(scratch2_, Operand(esi, Context::SlotOffset(Context::GLOBAL_INDEX))); + __ mov(scratch2_, + FieldOperand(scratch2_, GlobalObject::kGlobalContextOffset)); + __ cmp(scratch1_, + ContextOperand(scratch2_, + Context::STRING_FUNCTION_PROTOTYPE_MAP_INDEX)); + __ j(not_equal, &false_result); + // Set the bit in the map to indicate that it has been checked safe for + // default valueOf and set true result. + __ or_(FieldOperand(map_result_, Map::kBitField2Offset), + Immediate(1 << Map::kStringWrapperSafeForDefaultValueOf)); + __ Set(map_result_, Immediate(1)); + __ jmp(exit_label()); + __ bind(&false_result); + // Set false result. + __ Set(map_result_, Immediate(0)); + } + + private: + Register object_; + Register map_result_; + Register scratch1_; + Register scratch2_; +}; + + +void CodeGenerator::GenerateIsStringWrapperSafeForDefaultValueOf( + ZoneList<Expression*>* args) { + ASSERT(args->length() == 1); + Load(args->at(0)); + Result obj = frame_->Pop(); // Pop the string wrapper. + obj.ToRegister(); + ASSERT(obj.is_valid()); + if (FLAG_debug_code) { + __ AbortIfSmi(obj.reg()); + } + + // Check whether this map has already been checked to be safe for default + // valueOf. + Result map_result = allocator()->Allocate(); + ASSERT(map_result.is_valid()); + __ mov(map_result.reg(), FieldOperand(obj.reg(), HeapObject::kMapOffset)); + __ test_b(FieldOperand(map_result.reg(), Map::kBitField2Offset), + 1 << Map::kStringWrapperSafeForDefaultValueOf); + destination()->true_target()->Branch(not_zero); + + // We need an additional two scratch registers for the deferred code. + Result temp1 = allocator()->Allocate(); + ASSERT(temp1.is_valid()); + Result temp2 = allocator()->Allocate(); + ASSERT(temp2.is_valid()); + + DeferredIsStringWrapperSafeForDefaultValueOf* deferred = + new DeferredIsStringWrapperSafeForDefaultValueOf( + obj.reg(), map_result.reg(), temp1.reg(), temp2.reg()); + deferred->Branch(zero); + deferred->BindExit(); + __ test(map_result.reg(), Operand(map_result.reg())); + obj.Unuse(); + map_result.Unuse(); + temp1.Unuse(); + temp2.Unuse(); + destination()->Split(not_equal); +} + + +void CodeGenerator::GenerateIsFunction(ZoneList<Expression*>* args) { + // This generates a fast version of: + // (%_ClassOf(arg) === 'Function') + ASSERT(args->length() == 1); + Load(args->at(0)); + Result obj = frame_->Pop(); + obj.ToRegister(); + __ test(obj.reg(), Immediate(kSmiTagMask)); + destination()->false_target()->Branch(zero); + Result temp = allocator()->Allocate(); + ASSERT(temp.is_valid()); + __ CmpObjectType(obj.reg(), JS_FUNCTION_TYPE, temp.reg()); + obj.Unuse(); + temp.Unuse(); + destination()->Split(equal); +} + + +void CodeGenerator::GenerateIsUndetectableObject(ZoneList<Expression*>* args) { + ASSERT(args->length() == 1); + Load(args->at(0)); + Result obj = frame_->Pop(); + obj.ToRegister(); + __ test(obj.reg(), Immediate(kSmiTagMask)); + destination()->false_target()->Branch(zero); + Result temp = allocator()->Allocate(); + ASSERT(temp.is_valid()); + __ mov(temp.reg(), + FieldOperand(obj.reg(), HeapObject::kMapOffset)); + __ test_b(FieldOperand(temp.reg(), Map::kBitFieldOffset), + 1 << Map::kIsUndetectable); + obj.Unuse(); + temp.Unuse(); + destination()->Split(not_zero); +} + + +void CodeGenerator::GenerateIsConstructCall(ZoneList<Expression*>* args) { + ASSERT(args->length() == 0); + + // Get the frame pointer for the calling frame. + Result fp = allocator()->Allocate(); + __ mov(fp.reg(), Operand(ebp, StandardFrameConstants::kCallerFPOffset)); + + // Skip the arguments adaptor frame if it exists. + Label check_frame_marker; + __ cmp(Operand(fp.reg(), StandardFrameConstants::kContextOffset), + Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR))); + __ j(not_equal, &check_frame_marker); + __ mov(fp.reg(), Operand(fp.reg(), StandardFrameConstants::kCallerFPOffset)); + + // Check the marker in the calling frame. + __ bind(&check_frame_marker); + __ cmp(Operand(fp.reg(), StandardFrameConstants::kMarkerOffset), + Immediate(Smi::FromInt(StackFrame::CONSTRUCT))); + fp.Unuse(); + destination()->Split(equal); +} + + +void CodeGenerator::GenerateArgumentsLength(ZoneList<Expression*>* args) { + ASSERT(args->length() == 0); + + Result fp = allocator_->Allocate(); + Result result = allocator_->Allocate(); + ASSERT(fp.is_valid() && result.is_valid()); + + Label exit; + + // Get the number of formal parameters. + __ Set(result.reg(), Immediate(Smi::FromInt(scope()->num_parameters()))); + + // Check if the calling frame is an arguments adaptor frame. + __ mov(fp.reg(), Operand(ebp, StandardFrameConstants::kCallerFPOffset)); + __ cmp(Operand(fp.reg(), StandardFrameConstants::kContextOffset), + Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR))); + __ j(not_equal, &exit); + + // Arguments adaptor case: Read the arguments length from the + // adaptor frame. + __ mov(result.reg(), + Operand(fp.reg(), ArgumentsAdaptorFrameConstants::kLengthOffset)); + + __ bind(&exit); + result.set_type_info(TypeInfo::Smi()); + if (FLAG_debug_code) __ AbortIfNotSmi(result.reg()); + frame_->Push(&result); +} + + +void CodeGenerator::GenerateClassOf(ZoneList<Expression*>* args) { + ASSERT(args->length() == 1); + JumpTarget leave, null, function, non_function_constructor; + Load(args->at(0)); // Load the object. + Result obj = frame_->Pop(); + obj.ToRegister(); + frame_->Spill(obj.reg()); + + // If the object is a smi, we return null. + __ test(obj.reg(), Immediate(kSmiTagMask)); + null.Branch(zero); + + // Check that the object is a JS object but take special care of JS + // functions to make sure they have 'Function' as their class. + __ CmpObjectType(obj.reg(), FIRST_JS_OBJECT_TYPE, obj.reg()); + null.Branch(below); + + // As long as JS_FUNCTION_TYPE is the last instance type and it is + // right after LAST_JS_OBJECT_TYPE, we can avoid checking for + // LAST_JS_OBJECT_TYPE. + STATIC_ASSERT(LAST_TYPE == JS_FUNCTION_TYPE); + STATIC_ASSERT(JS_FUNCTION_TYPE == LAST_JS_OBJECT_TYPE + 1); + __ CmpInstanceType(obj.reg(), JS_FUNCTION_TYPE); + function.Branch(equal); + + // Check if the constructor in the map is a function. + { Result tmp = allocator()->Allocate(); + __ mov(obj.reg(), FieldOperand(obj.reg(), Map::kConstructorOffset)); + __ CmpObjectType(obj.reg(), JS_FUNCTION_TYPE, tmp.reg()); + non_function_constructor.Branch(not_equal); + } + + // The map register now contains the constructor function. Grab the + // instance class name from there. + __ mov(obj.reg(), + FieldOperand(obj.reg(), JSFunction::kSharedFunctionInfoOffset)); + __ mov(obj.reg(), + FieldOperand(obj.reg(), SharedFunctionInfo::kInstanceClassNameOffset)); + frame_->Push(&obj); + leave.Jump(); + + // Functions have class 'Function'. + function.Bind(); + frame_->Push(FACTORY->function_class_symbol()); + leave.Jump(); + + // Objects with a non-function constructor have class 'Object'. + non_function_constructor.Bind(); + frame_->Push(FACTORY->Object_symbol()); + leave.Jump(); + + // Non-JS objects have class null. + null.Bind(); + frame_->Push(FACTORY->null_value()); + + // All done. + leave.Bind(); +} + + +void CodeGenerator::GenerateValueOf(ZoneList<Expression*>* args) { + ASSERT(args->length() == 1); + JumpTarget leave; + Load(args->at(0)); // Load the object. + frame_->Dup(); + Result object = frame_->Pop(); + object.ToRegister(); + ASSERT(object.is_valid()); + // if (object->IsSmi()) return object. + __ test(object.reg(), Immediate(kSmiTagMask)); + leave.Branch(zero, taken); + // It is a heap object - get map. + Result temp = allocator()->Allocate(); + ASSERT(temp.is_valid()); + // if (!object->IsJSValue()) return object. + __ CmpObjectType(object.reg(), JS_VALUE_TYPE, temp.reg()); + leave.Branch(not_equal, not_taken); + __ mov(temp.reg(), FieldOperand(object.reg(), JSValue::kValueOffset)); + object.Unuse(); + frame_->SetElementAt(0, &temp); + leave.Bind(); +} + + +void CodeGenerator::GenerateSetValueOf(ZoneList<Expression*>* args) { + ASSERT(args->length() == 2); + JumpTarget leave; + Load(args->at(0)); // Load the object. + Load(args->at(1)); // Load the value. + Result value = frame_->Pop(); + Result object = frame_->Pop(); + value.ToRegister(); + object.ToRegister(); + + // if (object->IsSmi()) return value. + __ test(object.reg(), Immediate(kSmiTagMask)); + leave.Branch(zero, &value, taken); + + // It is a heap object - get its map. + Result scratch = allocator_->Allocate(); + ASSERT(scratch.is_valid()); + // if (!object->IsJSValue()) return value. + __ CmpObjectType(object.reg(), JS_VALUE_TYPE, scratch.reg()); + leave.Branch(not_equal, &value, not_taken); + + // Store the value. + __ mov(FieldOperand(object.reg(), JSValue::kValueOffset), value.reg()); + // Update the write barrier. Save the value as it will be + // overwritten by the write barrier code and is needed afterward. + Result duplicate_value = allocator_->Allocate(); + ASSERT(duplicate_value.is_valid()); + __ mov(duplicate_value.reg(), value.reg()); + // The object register is also overwritten by the write barrier and + // possibly aliased in the frame. + frame_->Spill(object.reg()); + __ RecordWrite(object.reg(), JSValue::kValueOffset, duplicate_value.reg(), + scratch.reg()); + object.Unuse(); + scratch.Unuse(); + duplicate_value.Unuse(); + + // Leave. + leave.Bind(&value); + frame_->Push(&value); +} + + +void CodeGenerator::GenerateArguments(ZoneList<Expression*>* args) { + ASSERT(args->length() == 1); + + // ArgumentsAccessStub expects the key in edx and the formal + // parameter count in eax. + Load(args->at(0)); + Result key = frame_->Pop(); + // Explicitly create a constant result. + Result count(Handle<Smi>(Smi::FromInt(scope()->num_parameters()))); + // Call the shared stub to get to arguments[key]. + ArgumentsAccessStub stub(ArgumentsAccessStub::READ_ELEMENT); + Result result = frame_->CallStub(&stub, &key, &count); + frame_->Push(&result); +} + + +void CodeGenerator::GenerateObjectEquals(ZoneList<Expression*>* args) { + ASSERT(args->length() == 2); + + // Load the two objects into registers and perform the comparison. + Load(args->at(0)); + Load(args->at(1)); + Result right = frame_->Pop(); + Result left = frame_->Pop(); + right.ToRegister(); + left.ToRegister(); + __ cmp(right.reg(), Operand(left.reg())); + right.Unuse(); + left.Unuse(); + destination()->Split(equal); +} + + +void CodeGenerator::GenerateGetFramePointer(ZoneList<Expression*>* args) { + ASSERT(args->length() == 0); + STATIC_ASSERT(kSmiTag == 0); // EBP value is aligned, so it looks like a Smi. + Result ebp_as_smi = allocator_->Allocate(); + ASSERT(ebp_as_smi.is_valid()); + __ mov(ebp_as_smi.reg(), Operand(ebp)); + frame_->Push(&ebp_as_smi); +} + + +void CodeGenerator::GenerateRandomHeapNumber( + ZoneList<Expression*>* args) { + ASSERT(args->length() == 0); + frame_->SpillAll(); + + Label slow_allocate_heapnumber; + Label heapnumber_allocated; + + __ AllocateHeapNumber(edi, ebx, ecx, &slow_allocate_heapnumber); + __ jmp(&heapnumber_allocated); + + __ bind(&slow_allocate_heapnumber); + // Allocate a heap number. + __ CallRuntime(Runtime::kNumberAlloc, 0); + __ mov(edi, eax); + + __ bind(&heapnumber_allocated); + + __ PrepareCallCFunction(1, ebx); + __ mov(Operand(esp, 0), Immediate(ExternalReference::isolate_address())); + __ CallCFunction(ExternalReference::random_uint32_function(masm()->isolate()), + 1); + + // Convert 32 random bits in eax to 0.(32 random bits) in a double + // by computing: + // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)). + // This is implemented on both SSE2 and FPU. + if (CpuFeatures::IsSupported(SSE2)) { + CpuFeatures::Scope fscope(SSE2); + __ mov(ebx, Immediate(0x49800000)); // 1.0 x 2^20 as single. + __ movd(xmm1, Operand(ebx)); + __ movd(xmm0, Operand(eax)); + __ cvtss2sd(xmm1, xmm1); + __ pxor(xmm0, xmm1); + __ subsd(xmm0, xmm1); + __ movdbl(FieldOperand(edi, HeapNumber::kValueOffset), xmm0); + } else { + // 0x4130000000000000 is 1.0 x 2^20 as a double. + __ mov(FieldOperand(edi, HeapNumber::kExponentOffset), + Immediate(0x41300000)); + __ mov(FieldOperand(edi, HeapNumber::kMantissaOffset), eax); + __ fld_d(FieldOperand(edi, HeapNumber::kValueOffset)); + __ mov(FieldOperand(edi, HeapNumber::kMantissaOffset), Immediate(0)); + __ fld_d(FieldOperand(edi, HeapNumber::kValueOffset)); + __ fsubp(1); + __ fstp_d(FieldOperand(edi, HeapNumber::kValueOffset)); + } + __ mov(eax, edi); + + Result result = allocator_->Allocate(eax); + frame_->Push(&result); +} + + +void CodeGenerator::GenerateStringAdd(ZoneList<Expression*>* args) { + ASSERT_EQ(2, args->length()); + + Load(args->at(0)); + Load(args->at(1)); + + StringAddStub stub(NO_STRING_ADD_FLAGS); + Result answer = frame_->CallStub(&stub, 2); + frame_->Push(&answer); +} + + +void CodeGenerator::GenerateSubString(ZoneList<Expression*>* args) { + ASSERT_EQ(3, args->length()); + + Load(args->at(0)); + Load(args->at(1)); + Load(args->at(2)); + + SubStringStub stub; + Result answer = frame_->CallStub(&stub, 3); + frame_->Push(&answer); +} + + +void CodeGenerator::GenerateStringCompare(ZoneList<Expression*>* args) { + ASSERT_EQ(2, args->length()); + + Load(args->at(0)); + Load(args->at(1)); + + StringCompareStub stub; + Result answer = frame_->CallStub(&stub, 2); + frame_->Push(&answer); +} + + +void CodeGenerator::GenerateRegExpExec(ZoneList<Expression*>* args) { + ASSERT_EQ(4, args->length()); + + // Load the arguments on the stack and call the stub. + Load(args->at(0)); + Load(args->at(1)); + Load(args->at(2)); + Load(args->at(3)); + + RegExpExecStub stub; + Result result = frame_->CallStub(&stub, 4); + frame_->Push(&result); +} + + +void CodeGenerator::GenerateRegExpConstructResult(ZoneList<Expression*>* args) { + ASSERT_EQ(3, args->length()); + + Load(args->at(0)); // Size of array, smi. + Load(args->at(1)); // "index" property value. + Load(args->at(2)); // "input" property value. + + RegExpConstructResultStub stub; + Result result = frame_->CallStub(&stub, 3); + frame_->Push(&result); +} + + +class DeferredSearchCache: public DeferredCode { + public: + DeferredSearchCache(Register dst, Register cache, Register key) + : dst_(dst), cache_(cache), key_(key) { + set_comment("[ DeferredSearchCache"); + } + + virtual void Generate(); + + private: + Register dst_; // on invocation Smi index of finger, on exit + // holds value being looked up. + Register cache_; // instance of JSFunctionResultCache. + Register key_; // key being looked up. +}; + + +void DeferredSearchCache::Generate() { + Label first_loop, search_further, second_loop, cache_miss; + + // Smi-tagging is equivalent to multiplying by 2. + STATIC_ASSERT(kSmiTag == 0); + STATIC_ASSERT(kSmiTagSize == 1); + + Smi* kEntrySizeSmi = Smi::FromInt(JSFunctionResultCache::kEntrySize); + Smi* kEntriesIndexSmi = Smi::FromInt(JSFunctionResultCache::kEntriesIndex); + + // Check the cache from finger to start of the cache. + __ bind(&first_loop); + __ sub(Operand(dst_), Immediate(kEntrySizeSmi)); + __ cmp(Operand(dst_), Immediate(kEntriesIndexSmi)); + __ j(less, &search_further); + + __ cmp(key_, CodeGenerator::FixedArrayElementOperand(cache_, dst_)); + __ j(not_equal, &first_loop); + + __ mov(FieldOperand(cache_, JSFunctionResultCache::kFingerOffset), dst_); + __ mov(dst_, CodeGenerator::FixedArrayElementOperand(cache_, dst_, 1)); + __ jmp(exit_label()); + + __ bind(&search_further); + + // Check the cache from end of cache up to finger. + __ mov(dst_, FieldOperand(cache_, JSFunctionResultCache::kCacheSizeOffset)); + + __ bind(&second_loop); + __ sub(Operand(dst_), Immediate(kEntrySizeSmi)); + // Consider prefetching into some reg. + __ cmp(dst_, FieldOperand(cache_, JSFunctionResultCache::kFingerOffset)); + __ j(less_equal, &cache_miss); + + __ cmp(key_, CodeGenerator::FixedArrayElementOperand(cache_, dst_)); + __ j(not_equal, &second_loop); + + __ mov(FieldOperand(cache_, JSFunctionResultCache::kFingerOffset), dst_); + __ mov(dst_, CodeGenerator::FixedArrayElementOperand(cache_, dst_, 1)); + __ jmp(exit_label()); + + __ bind(&cache_miss); + __ push(cache_); // store a reference to cache + __ push(key_); // store a key + __ push(Operand(esi, Context::SlotOffset(Context::GLOBAL_INDEX))); + __ push(key_); + // On ia32 function must be in edi. + __ mov(edi, FieldOperand(cache_, JSFunctionResultCache::kFactoryOffset)); + ParameterCount expected(1); + __ InvokeFunction(edi, expected, CALL_FUNCTION); + + // Find a place to put new cached value into. + Label add_new_entry, update_cache; + __ mov(ecx, Operand(esp, kPointerSize)); // restore the cache + // Possible optimization: cache size is constant for the given cache + // so technically we could use a constant here. However, if we have + // cache miss this optimization would hardly matter much. + + // Check if we could add new entry to cache. + __ mov(ebx, FieldOperand(ecx, FixedArray::kLengthOffset)); + __ cmp(ebx, FieldOperand(ecx, JSFunctionResultCache::kCacheSizeOffset)); + __ j(greater, &add_new_entry); + + // Check if we could evict entry after finger. + __ mov(edx, FieldOperand(ecx, JSFunctionResultCache::kFingerOffset)); + __ add(Operand(edx), Immediate(kEntrySizeSmi)); + __ cmp(ebx, Operand(edx)); + __ j(greater, &update_cache); + + // Need to wrap over the cache. + __ mov(edx, Immediate(kEntriesIndexSmi)); + __ jmp(&update_cache); + + __ bind(&add_new_entry); + __ mov(edx, FieldOperand(ecx, JSFunctionResultCache::kCacheSizeOffset)); + __ lea(ebx, Operand(edx, JSFunctionResultCache::kEntrySize << 1)); + __ mov(FieldOperand(ecx, JSFunctionResultCache::kCacheSizeOffset), ebx); + + // Update the cache itself. + // edx holds the index. + __ bind(&update_cache); + __ pop(ebx); // restore the key + __ mov(FieldOperand(ecx, JSFunctionResultCache::kFingerOffset), edx); + // Store key. + __ mov(CodeGenerator::FixedArrayElementOperand(ecx, edx), ebx); + __ RecordWrite(ecx, 0, ebx, edx); + + // Store value. + __ pop(ecx); // restore the cache. + __ mov(edx, FieldOperand(ecx, JSFunctionResultCache::kFingerOffset)); + __ add(Operand(edx), Immediate(Smi::FromInt(1))); + __ mov(ebx, eax); + __ mov(CodeGenerator::FixedArrayElementOperand(ecx, edx), ebx); + __ RecordWrite(ecx, 0, ebx, edx); + + if (!dst_.is(eax)) { + __ mov(dst_, eax); + } +} + + +void CodeGenerator::GenerateGetFromCache(ZoneList<Expression*>* args) { + ASSERT_EQ(2, args->length()); + + ASSERT_NE(NULL, args->at(0)->AsLiteral()); + int cache_id = Smi::cast(*(args->at(0)->AsLiteral()->handle()))->value(); + + Handle<FixedArray> jsfunction_result_caches( + masm()->isolate()->global_context()->jsfunction_result_caches()); + if (jsfunction_result_caches->length() <= cache_id) { + __ Abort("Attempt to use undefined cache."); + frame_->Push(FACTORY->undefined_value()); + return; + } + + Load(args->at(1)); + Result key = frame_->Pop(); + key.ToRegister(); + + Result cache = allocator()->Allocate(); + ASSERT(cache.is_valid()); + __ mov(cache.reg(), ContextOperand(esi, Context::GLOBAL_INDEX)); + __ mov(cache.reg(), + FieldOperand(cache.reg(), GlobalObject::kGlobalContextOffset)); + __ mov(cache.reg(), + ContextOperand(cache.reg(), Context::JSFUNCTION_RESULT_CACHES_INDEX)); + __ mov(cache.reg(), + FieldOperand(cache.reg(), FixedArray::OffsetOfElementAt(cache_id))); + + Result tmp = allocator()->Allocate(); + ASSERT(tmp.is_valid()); + + DeferredSearchCache* deferred = new DeferredSearchCache(tmp.reg(), + cache.reg(), + key.reg()); + + // tmp.reg() now holds finger offset as a smi. + STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize == 1); + __ mov(tmp.reg(), FieldOperand(cache.reg(), + JSFunctionResultCache::kFingerOffset)); + __ cmp(key.reg(), FixedArrayElementOperand(cache.reg(), tmp.reg())); + deferred->Branch(not_equal); + + __ mov(tmp.reg(), FixedArrayElementOperand(cache.reg(), tmp.reg(), 1)); + + deferred->BindExit(); + frame_->Push(&tmp); +} + + +void CodeGenerator::GenerateNumberToString(ZoneList<Expression*>* args) { + ASSERT_EQ(args->length(), 1); + + // Load the argument on the stack and call the stub. + Load(args->at(0)); + NumberToStringStub stub; + Result result = frame_->CallStub(&stub, 1); + frame_->Push(&result); +} + + +class DeferredSwapElements: public DeferredCode { + public: + DeferredSwapElements(Register object, Register index1, Register index2) + : object_(object), index1_(index1), index2_(index2) { + set_comment("[ DeferredSwapElements"); + } + + virtual void Generate(); + + private: + Register object_, index1_, index2_; +}; + + +void DeferredSwapElements::Generate() { + __ push(object_); + __ push(index1_); + __ push(index2_); + __ CallRuntime(Runtime::kSwapElements, 3); +} + + +void CodeGenerator::GenerateSwapElements(ZoneList<Expression*>* args) { + // Note: this code assumes that indices are passed are within + // elements' bounds and refer to valid (not holes) values. + Comment cmnt(masm_, "[ GenerateSwapElements"); + + ASSERT_EQ(3, args->length()); + + Load(args->at(0)); + Load(args->at(1)); + Load(args->at(2)); + + Result index2 = frame_->Pop(); + index2.ToRegister(); + + Result index1 = frame_->Pop(); + index1.ToRegister(); + + Result object = frame_->Pop(); + object.ToRegister(); + + Result tmp1 = allocator()->Allocate(); + tmp1.ToRegister(); + Result tmp2 = allocator()->Allocate(); + tmp2.ToRegister(); + + frame_->Spill(object.reg()); + frame_->Spill(index1.reg()); + frame_->Spill(index2.reg()); + + DeferredSwapElements* deferred = new DeferredSwapElements(object.reg(), + index1.reg(), + index2.reg()); + + // Fetch the map and check if array is in fast case. + // Check that object doesn't require security checks and + // has no indexed interceptor. + __ CmpObjectType(object.reg(), FIRST_JS_OBJECT_TYPE, tmp1.reg()); + deferred->Branch(below); + __ test_b(FieldOperand(tmp1.reg(), Map::kBitFieldOffset), + KeyedLoadIC::kSlowCaseBitFieldMask); + deferred->Branch(not_zero); + + // Check the object's elements are in fast case and writable. + __ mov(tmp1.reg(), FieldOperand(object.reg(), JSObject::kElementsOffset)); + __ cmp(FieldOperand(tmp1.reg(), HeapObject::kMapOffset), + Immediate(FACTORY->fixed_array_map())); + deferred->Branch(not_equal); + + // Smi-tagging is equivalent to multiplying by 2. + STATIC_ASSERT(kSmiTag == 0); + STATIC_ASSERT(kSmiTagSize == 1); + + // Check that both indices are smis. + __ mov(tmp2.reg(), index1.reg()); + __ or_(tmp2.reg(), Operand(index2.reg())); + __ test(tmp2.reg(), Immediate(kSmiTagMask)); + deferred->Branch(not_zero); + + // Check that both indices are valid. + __ mov(tmp2.reg(), FieldOperand(object.reg(), JSArray::kLengthOffset)); + __ cmp(tmp2.reg(), Operand(index1.reg())); + deferred->Branch(below_equal); + __ cmp(tmp2.reg(), Operand(index2.reg())); + deferred->Branch(below_equal); + + // Bring addresses into index1 and index2. + __ lea(index1.reg(), FixedArrayElementOperand(tmp1.reg(), index1.reg())); + __ lea(index2.reg(), FixedArrayElementOperand(tmp1.reg(), index2.reg())); + + // Swap elements. + __ mov(object.reg(), Operand(index1.reg(), 0)); + __ mov(tmp2.reg(), Operand(index2.reg(), 0)); + __ mov(Operand(index2.reg(), 0), object.reg()); + __ mov(Operand(index1.reg(), 0), tmp2.reg()); + + Label done; + __ InNewSpace(tmp1.reg(), tmp2.reg(), equal, &done); + // Possible optimization: do a check that both values are Smis + // (or them and test against Smi mask.) + + __ mov(tmp2.reg(), tmp1.reg()); + __ RecordWriteHelper(tmp2.reg(), index1.reg(), object.reg()); + __ RecordWriteHelper(tmp1.reg(), index2.reg(), object.reg()); + __ bind(&done); + + deferred->BindExit(); + frame_->Push(FACTORY->undefined_value()); +} + + +void CodeGenerator::GenerateCallFunction(ZoneList<Expression*>* args) { + Comment cmnt(masm_, "[ GenerateCallFunction"); + + ASSERT(args->length() >= 2); + + int n_args = args->length() - 2; // for receiver and function. + Load(args->at(0)); // receiver + for (int i = 0; i < n_args; i++) { + Load(args->at(i + 1)); + } + Load(args->at(n_args + 1)); // function + Result result = frame_->CallJSFunction(n_args); + frame_->Push(&result); +} + + +// Generates the Math.pow method. Only handles special cases and +// branches to the runtime system for everything else. Please note +// that this function assumes that the callsite has executed ToNumber +// on both arguments. +void CodeGenerator::GenerateMathPow(ZoneList<Expression*>* args) { + ASSERT(args->length() == 2); + Load(args->at(0)); + Load(args->at(1)); + if (!CpuFeatures::IsSupported(SSE2)) { + Result res = frame_->CallRuntime(Runtime::kMath_pow, 2); + frame_->Push(&res); + } else { + CpuFeatures::Scope use_sse2(SSE2); + Label allocate_return; + // Load the two operands while leaving the values on the frame. + frame()->Dup(); + Result exponent = frame()->Pop(); + exponent.ToRegister(); + frame()->Spill(exponent.reg()); + frame()->PushElementAt(1); + Result base = frame()->Pop(); + base.ToRegister(); + frame()->Spill(base.reg()); + + Result answer = allocator()->Allocate(); + ASSERT(answer.is_valid()); + ASSERT(!exponent.reg().is(base.reg())); + JumpTarget call_runtime; + + // Save 1 in xmm3 - we need this several times later on. + __ mov(answer.reg(), Immediate(1)); + __ cvtsi2sd(xmm3, Operand(answer.reg())); + + Label exponent_nonsmi; + Label base_nonsmi; + // If the exponent is a heap number go to that specific case. + __ test(exponent.reg(), Immediate(kSmiTagMask)); + __ j(not_zero, &exponent_nonsmi); + __ test(base.reg(), Immediate(kSmiTagMask)); + __ j(not_zero, &base_nonsmi); + + // Optimized version when y is an integer. + Label powi; + __ SmiUntag(base.reg()); + __ cvtsi2sd(xmm0, Operand(base.reg())); + __ jmp(&powi); + // exponent is smi and base is a heapnumber. + __ bind(&base_nonsmi); + __ cmp(FieldOperand(base.reg(), HeapObject::kMapOffset), + FACTORY->heap_number_map()); + call_runtime.Branch(not_equal); + + __ movdbl(xmm0, FieldOperand(base.reg(), HeapNumber::kValueOffset)); + + // Optimized version of pow if y is an integer. + __ bind(&powi); + __ SmiUntag(exponent.reg()); + + // Save exponent in base as we need to check if exponent is negative later. + // We know that base and exponent are in different registers. + __ mov(base.reg(), exponent.reg()); + + // Get absolute value of exponent. + Label no_neg; + __ cmp(exponent.reg(), 0); + __ j(greater_equal, &no_neg); + __ neg(exponent.reg()); + __ bind(&no_neg); + + // Load xmm1 with 1. + __ movsd(xmm1, xmm3); + Label while_true; + Label no_multiply; + + __ bind(&while_true); + __ shr(exponent.reg(), 1); + __ j(not_carry, &no_multiply); + __ mulsd(xmm1, xmm0); + __ bind(&no_multiply); + __ test(exponent.reg(), Operand(exponent.reg())); + __ mulsd(xmm0, xmm0); + __ j(not_zero, &while_true); + + // x has the original value of y - if y is negative return 1/result. + __ test(base.reg(), Operand(base.reg())); + __ j(positive, &allocate_return); + // Special case if xmm1 has reached infinity. + __ mov(answer.reg(), Immediate(0x7FB00000)); + __ movd(xmm0, Operand(answer.reg())); + __ cvtss2sd(xmm0, xmm0); + __ ucomisd(xmm0, xmm1); + call_runtime.Branch(equal); + __ divsd(xmm3, xmm1); + __ movsd(xmm1, xmm3); + __ jmp(&allocate_return); + + // exponent (or both) is a heapnumber - no matter what we should now work + // on doubles. + __ bind(&exponent_nonsmi); + __ cmp(FieldOperand(exponent.reg(), HeapObject::kMapOffset), + FACTORY->heap_number_map()); + call_runtime.Branch(not_equal); + __ movdbl(xmm1, FieldOperand(exponent.reg(), HeapNumber::kValueOffset)); + // Test if exponent is nan. + __ ucomisd(xmm1, xmm1); + call_runtime.Branch(parity_even); + + Label base_not_smi; + Label handle_special_cases; + __ test(base.reg(), Immediate(kSmiTagMask)); + __ j(not_zero, &base_not_smi); + __ SmiUntag(base.reg()); + __ cvtsi2sd(xmm0, Operand(base.reg())); + __ jmp(&handle_special_cases); + __ bind(&base_not_smi); + __ cmp(FieldOperand(base.reg(), HeapObject::kMapOffset), + FACTORY->heap_number_map()); + call_runtime.Branch(not_equal); + __ mov(answer.reg(), FieldOperand(base.reg(), HeapNumber::kExponentOffset)); + __ and_(answer.reg(), HeapNumber::kExponentMask); + __ cmp(Operand(answer.reg()), Immediate(HeapNumber::kExponentMask)); + // base is NaN or +/-Infinity + call_runtime.Branch(greater_equal); + __ movdbl(xmm0, FieldOperand(base.reg(), HeapNumber::kValueOffset)); + + // base is in xmm0 and exponent is in xmm1. + __ bind(&handle_special_cases); + Label not_minus_half; + // Test for -0.5. + // Load xmm2 with -0.5. + __ mov(answer.reg(), Immediate(0xBF000000)); + __ movd(xmm2, Operand(answer.reg())); + __ cvtss2sd(xmm2, xmm2); + // xmm2 now has -0.5. + __ ucomisd(xmm2, xmm1); + __ j(not_equal, ¬_minus_half); + + // Calculates reciprocal of square root. + // sqrtsd returns -0 when input is -0. ECMA spec requires +0. + __ xorpd(xmm1, xmm1); + __ addsd(xmm1, xmm0); + __ sqrtsd(xmm1, xmm1); + __ divsd(xmm3, xmm1); + __ movsd(xmm1, xmm3); + __ jmp(&allocate_return); + + // Test for 0.5. + __ bind(¬_minus_half); + // Load xmm2 with 0.5. + // Since xmm3 is 1 and xmm2 is -0.5 this is simply xmm2 + xmm3. + __ addsd(xmm2, xmm3); + // xmm2 now has 0.5. + __ ucomisd(xmm2, xmm1); + call_runtime.Branch(not_equal); + // Calculates square root. + // sqrtsd returns -0 when input is -0. ECMA spec requires +0. + __ xorpd(xmm1, xmm1); + __ addsd(xmm1, xmm0); + __ sqrtsd(xmm1, xmm1); + + JumpTarget done; + Label failure, success; + __ bind(&allocate_return); + // Make a copy of the frame to enable us to handle allocation + // failure after the JumpTarget jump. + VirtualFrame* clone = new VirtualFrame(frame()); + __ AllocateHeapNumber(answer.reg(), exponent.reg(), + base.reg(), &failure); + __ movdbl(FieldOperand(answer.reg(), HeapNumber::kValueOffset), xmm1); + // Remove the two original values from the frame - we only need those + // in the case where we branch to runtime. + frame()->Drop(2); + exponent.Unuse(); + base.Unuse(); + done.Jump(&answer); + // Use the copy of the original frame as our current frame. + RegisterFile empty_regs; + SetFrame(clone, &empty_regs); + // If we experience an allocation failure we branch to runtime. + __ bind(&failure); + call_runtime.Bind(); + answer = frame()->CallRuntime(Runtime::kMath_pow_cfunction, 2); + + done.Bind(&answer); + frame()->Push(&answer); + } +} + + +void CodeGenerator::GenerateMathSin(ZoneList<Expression*>* args) { + ASSERT_EQ(args->length(), 1); + Load(args->at(0)); + TranscendentalCacheStub stub(TranscendentalCache::SIN, + TranscendentalCacheStub::TAGGED); + Result result = frame_->CallStub(&stub, 1); + frame_->Push(&result); +} + + +void CodeGenerator::GenerateMathCos(ZoneList<Expression*>* args) { + ASSERT_EQ(args->length(), 1); + Load(args->at(0)); + TranscendentalCacheStub stub(TranscendentalCache::COS, + TranscendentalCacheStub::TAGGED); + Result result = frame_->CallStub(&stub, 1); + frame_->Push(&result); +} + + +void CodeGenerator::GenerateMathLog(ZoneList<Expression*>* args) { + ASSERT_EQ(args->length(), 1); + Load(args->at(0)); + TranscendentalCacheStub stub(TranscendentalCache::LOG, + TranscendentalCacheStub::TAGGED); + Result result = frame_->CallStub(&stub, 1); + frame_->Push(&result); +} + + +// Generates the Math.sqrt method. Please note - this function assumes that +// the callsite has executed ToNumber on the argument. +void CodeGenerator::GenerateMathSqrt(ZoneList<Expression*>* args) { + ASSERT_EQ(args->length(), 1); + Load(args->at(0)); + + if (!CpuFeatures::IsSupported(SSE2)) { + Result result = frame()->CallRuntime(Runtime::kMath_sqrt, 1); + frame()->Push(&result); + } else { + CpuFeatures::Scope use_sse2(SSE2); + // Leave original value on the frame if we need to call runtime. + frame()->Dup(); + Result result = frame()->Pop(); + result.ToRegister(); + frame()->Spill(result.reg()); + Label runtime; + Label non_smi; + Label load_done; + JumpTarget end; + + __ test(result.reg(), Immediate(kSmiTagMask)); + __ j(not_zero, &non_smi); + __ SmiUntag(result.reg()); + __ cvtsi2sd(xmm0, Operand(result.reg())); + __ jmp(&load_done); + __ bind(&non_smi); + __ cmp(FieldOperand(result.reg(), HeapObject::kMapOffset), + FACTORY->heap_number_map()); + __ j(not_equal, &runtime); + __ movdbl(xmm0, FieldOperand(result.reg(), HeapNumber::kValueOffset)); + + __ bind(&load_done); + __ sqrtsd(xmm0, xmm0); + // A copy of the virtual frame to allow us to go to runtime after the + // JumpTarget jump. + Result scratch = allocator()->Allocate(); + VirtualFrame* clone = new VirtualFrame(frame()); + __ AllocateHeapNumber(result.reg(), scratch.reg(), no_reg, &runtime); + + __ movdbl(FieldOperand(result.reg(), HeapNumber::kValueOffset), xmm0); + frame()->Drop(1); + scratch.Unuse(); + end.Jump(&result); + // We only branch to runtime if we have an allocation error. + // Use the copy of the original frame as our current frame. + RegisterFile empty_regs; + SetFrame(clone, &empty_regs); + __ bind(&runtime); + result = frame()->CallRuntime(Runtime::kMath_sqrt, 1); + + end.Bind(&result); + frame()->Push(&result); + } +} + + +void CodeGenerator::GenerateIsRegExpEquivalent(ZoneList<Expression*>* args) { + ASSERT_EQ(2, args->length()); + Load(args->at(0)); + Load(args->at(1)); + Result right_res = frame_->Pop(); + Result left_res = frame_->Pop(); + right_res.ToRegister(); + left_res.ToRegister(); + Result tmp_res = allocator()->Allocate(); + ASSERT(tmp_res.is_valid()); + Register right = right_res.reg(); + Register left = left_res.reg(); + Register tmp = tmp_res.reg(); + right_res.Unuse(); + left_res.Unuse(); + tmp_res.Unuse(); + __ cmp(left, Operand(right)); + destination()->true_target()->Branch(equal); + // Fail if either is a non-HeapObject. + __ mov(tmp, left); + __ and_(Operand(tmp), right); + __ test(Operand(tmp), Immediate(kSmiTagMask)); + destination()->false_target()->Branch(equal); + __ CmpObjectType(left, JS_REGEXP_TYPE, tmp); + destination()->false_target()->Branch(not_equal); + __ cmp(tmp, FieldOperand(right, HeapObject::kMapOffset)); + destination()->false_target()->Branch(not_equal); + __ mov(tmp, FieldOperand(left, JSRegExp::kDataOffset)); + __ cmp(tmp, FieldOperand(right, JSRegExp::kDataOffset)); + destination()->Split(equal); +} + + +void CodeGenerator::GenerateHasCachedArrayIndex(ZoneList<Expression*>* args) { + ASSERT(args->length() == 1); + Load(args->at(0)); + Result value = frame_->Pop(); + value.ToRegister(); + ASSERT(value.is_valid()); + if (FLAG_debug_code) { + __ AbortIfNotString(value.reg()); + } + + __ test(FieldOperand(value.reg(), String::kHashFieldOffset), + Immediate(String::kContainsCachedArrayIndexMask)); + + value.Unuse(); + destination()->Split(zero); +} + + +void CodeGenerator::GenerateGetCachedArrayIndex(ZoneList<Expression*>* args) { + ASSERT(args->length() == 1); + Load(args->at(0)); + Result string = frame_->Pop(); + string.ToRegister(); + if (FLAG_debug_code) { + __ AbortIfNotString(string.reg()); + } + + Result number = allocator()->Allocate(); + ASSERT(number.is_valid()); + __ mov(number.reg(), FieldOperand(string.reg(), String::kHashFieldOffset)); + __ IndexFromHash(number.reg(), number.reg()); + string.Unuse(); + frame_->Push(&number); +} + + +void CodeGenerator::VisitCallRuntime(CallRuntime* node) { + ASSERT(!in_safe_int32_mode()); + if (CheckForInlineRuntimeCall(node)) { + return; + } + + ZoneList<Expression*>* args = node->arguments(); + Comment cmnt(masm_, "[ CallRuntime"); + const Runtime::Function* function = node->function(); + + if (function == NULL) { + // Push the builtins object found in the current global object. + Result temp = allocator()->Allocate(); + ASSERT(temp.is_valid()); + __ mov(temp.reg(), GlobalObjectOperand()); + __ mov(temp.reg(), FieldOperand(temp.reg(), GlobalObject::kBuiltinsOffset)); + frame_->Push(&temp); + } + + // Push the arguments ("left-to-right"). + int arg_count = args->length(); + for (int i = 0; i < arg_count; i++) { + Load(args->at(i)); + } + + if (function == NULL) { + // Call the JS runtime function. + frame_->Push(node->name()); + Result answer = frame_->CallCallIC(RelocInfo::CODE_TARGET, + arg_count, + loop_nesting_); + frame_->RestoreContextRegister(); + frame_->Push(&answer); + } else { + // Call the C runtime function. + Result answer = frame_->CallRuntime(function, arg_count); + frame_->Push(&answer); + } +} + + +void CodeGenerator::VisitUnaryOperation(UnaryOperation* node) { + Comment cmnt(masm_, "[ UnaryOperation"); + + Token::Value op = node->op(); + + if (op == Token::NOT) { + // Swap the true and false targets but keep the same actual label + // as the fall through. + destination()->Invert(); + LoadCondition(node->expression(), destination(), true); + // Swap the labels back. + destination()->Invert(); + + } else if (op == Token::DELETE) { + Property* property = node->expression()->AsProperty(); + if (property != NULL) { + Load(property->obj()); + Load(property->key()); + frame_->Push(Smi::FromInt(strict_mode_flag())); + Result answer = frame_->InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION, 3); + frame_->Push(&answer); + return; + } + + Variable* variable = node->expression()->AsVariableProxy()->AsVariable(); + if (variable != NULL) { + // Delete of an unqualified identifier is disallowed in strict mode + // but "delete this" is. + ASSERT(strict_mode_flag() == kNonStrictMode || variable->is_this()); + Slot* slot = variable->AsSlot(); + if (variable->is_global()) { + LoadGlobal(); + frame_->Push(variable->name()); + frame_->Push(Smi::FromInt(kNonStrictMode)); + Result answer = frame_->InvokeBuiltin(Builtins::DELETE, + CALL_FUNCTION, 3); + frame_->Push(&answer); + + } else if (slot != NULL && slot->type() == Slot::LOOKUP) { + // Call the runtime to delete from the context holding the named + // variable. Sync the virtual frame eagerly so we can push the + // arguments directly into place. + frame_->SyncRange(0, frame_->element_count() - 1); + frame_->EmitPush(esi); + frame_->EmitPush(Immediate(variable->name())); + Result answer = frame_->CallRuntime(Runtime::kDeleteContextSlot, 2); + frame_->Push(&answer); + } else { + // Default: Result of deleting non-global, not dynamically + // introduced variables is false. + frame_->Push(FACTORY->false_value()); + } + } else { + // Default: Result of deleting expressions is true. + Load(node->expression()); // may have side-effects + frame_->SetElementAt(0, FACTORY->true_value()); + } + + } else if (op == Token::TYPEOF) { + // Special case for loading the typeof expression; see comment on + // LoadTypeofExpression(). + LoadTypeofExpression(node->expression()); + Result answer = frame_->CallRuntime(Runtime::kTypeof, 1); + frame_->Push(&answer); + + } else if (op == Token::VOID) { + Expression* expression = node->expression(); + if (expression && expression->AsLiteral() && ( + expression->AsLiteral()->IsTrue() || + expression->AsLiteral()->IsFalse() || + expression->AsLiteral()->handle()->IsNumber() || + expression->AsLiteral()->handle()->IsString() || + expression->AsLiteral()->handle()->IsJSRegExp() || + expression->AsLiteral()->IsNull())) { + // Omit evaluating the value of the primitive literal. + // It will be discarded anyway, and can have no side effect. + frame_->Push(FACTORY->undefined_value()); + } else { + Load(node->expression()); + frame_->SetElementAt(0, FACTORY->undefined_value()); + } + + } else { + if (in_safe_int32_mode()) { + Visit(node->expression()); + Result value = frame_->Pop(); + ASSERT(value.is_untagged_int32()); + // Registers containing an int32 value are not multiply used. + ASSERT(!value.is_register() || !frame_->is_used(value.reg())); + value.ToRegister(); + switch (op) { + case Token::SUB: { + __ neg(value.reg()); + frame_->Push(&value); + if (node->no_negative_zero()) { + // -MIN_INT is MIN_INT with the overflow flag set. + unsafe_bailout_->Branch(overflow); + } else { + // MIN_INT and 0 both have bad negations. They both have 31 zeros. + __ test(value.reg(), Immediate(0x7FFFFFFF)); + unsafe_bailout_->Branch(zero); + } + break; + } + case Token::BIT_NOT: { + __ not_(value.reg()); + frame_->Push(&value); + break; + } + case Token::ADD: { + // Unary plus has no effect on int32 values. + frame_->Push(&value); + break; + } + default: + UNREACHABLE(); + break; + } + } else { + Load(node->expression()); + bool can_overwrite = node->expression()->ResultOverwriteAllowed(); + UnaryOverwriteMode overwrite = + can_overwrite ? UNARY_OVERWRITE : UNARY_NO_OVERWRITE; + bool no_negative_zero = node->expression()->no_negative_zero(); + switch (op) { + case Token::NOT: + case Token::DELETE: + case Token::TYPEOF: + UNREACHABLE(); // handled above + break; + + case Token::SUB: { + GenericUnaryOpStub stub( + Token::SUB, + overwrite, + NO_UNARY_FLAGS, + no_negative_zero ? kIgnoreNegativeZero : kStrictNegativeZero); + Result operand = frame_->Pop(); + Result answer = frame_->CallStub(&stub, &operand); + answer.set_type_info(TypeInfo::Number()); + frame_->Push(&answer); + break; + } + case Token::BIT_NOT: { + // Smi check. + JumpTarget smi_label; + JumpTarget continue_label; + Result operand = frame_->Pop(); + TypeInfo operand_info = operand.type_info(); + operand.ToRegister(); + if (operand_info.IsSmi()) { + if (FLAG_debug_code) __ AbortIfNotSmi(operand.reg()); + frame_->Spill(operand.reg()); + // Set smi tag bit. It will be reset by the not operation. + __ lea(operand.reg(), Operand(operand.reg(), kSmiTagMask)); + __ not_(operand.reg()); + Result answer = operand; + answer.set_type_info(TypeInfo::Smi()); + frame_->Push(&answer); + } else { + __ test(operand.reg(), Immediate(kSmiTagMask)); + smi_label.Branch(zero, &operand, taken); + + GenericUnaryOpStub stub(Token::BIT_NOT, + overwrite, + NO_UNARY_SMI_CODE_IN_STUB); + Result answer = frame_->CallStub(&stub, &operand); + continue_label.Jump(&answer); + + smi_label.Bind(&answer); + answer.ToRegister(); + frame_->Spill(answer.reg()); + // Set smi tag bit. It will be reset by the not operation. + __ lea(answer.reg(), Operand(answer.reg(), kSmiTagMask)); + __ not_(answer.reg()); + + continue_label.Bind(&answer); + answer.set_type_info(TypeInfo::Integer32()); + frame_->Push(&answer); + } + break; + } + case Token::ADD: { + // Smi check. + JumpTarget continue_label; + Result operand = frame_->Pop(); + TypeInfo operand_info = operand.type_info(); + operand.ToRegister(); + __ test(operand.reg(), Immediate(kSmiTagMask)); + continue_label.Branch(zero, &operand, taken); + + frame_->Push(&operand); + Result answer = frame_->InvokeBuiltin(Builtins::TO_NUMBER, + CALL_FUNCTION, 1); + + continue_label.Bind(&answer); + if (operand_info.IsSmi()) { + answer.set_type_info(TypeInfo::Smi()); + } else if (operand_info.IsInteger32()) { + answer.set_type_info(TypeInfo::Integer32()); + } else { + answer.set_type_info(TypeInfo::Number()); + } + frame_->Push(&answer); + break; + } + default: + UNREACHABLE(); + } + } + } +} + + +// The value in dst was optimistically incremented or decremented. The +// result overflowed or was not smi tagged. Undo the operation, call +// into the runtime to convert the argument to a number, and call the +// specialized add or subtract stub. The result is left in dst. +class DeferredPrefixCountOperation: public DeferredCode { + public: + DeferredPrefixCountOperation(Register dst, + bool is_increment, + TypeInfo input_type) + : dst_(dst), is_increment_(is_increment), input_type_(input_type) { + set_comment("[ DeferredCountOperation"); + } + + virtual void Generate(); + + private: + Register dst_; + bool is_increment_; + TypeInfo input_type_; +}; + + +void DeferredPrefixCountOperation::Generate() { + // Undo the optimistic smi operation. + if (is_increment_) { + __ sub(Operand(dst_), Immediate(Smi::FromInt(1))); + } else { + __ add(Operand(dst_), Immediate(Smi::FromInt(1))); + } + Register left; + if (input_type_.IsNumber()) { + left = dst_; + } else { + __ push(dst_); + __ InvokeBuiltin(Builtins::TO_NUMBER, CALL_FUNCTION); + left = eax; + } + + GenericBinaryOpStub stub(is_increment_ ? Token::ADD : Token::SUB, + NO_OVERWRITE, + NO_GENERIC_BINARY_FLAGS, + TypeInfo::Number()); + stub.GenerateCall(masm_, left, Smi::FromInt(1)); + + if (!dst_.is(eax)) __ mov(dst_, eax); +} + + +// The value in dst was optimistically incremented or decremented. The +// result overflowed or was not smi tagged. Undo the operation and call +// into the runtime to convert the argument to a number. Update the +// original value in old. Call the specialized add or subtract stub. +// The result is left in dst. +class DeferredPostfixCountOperation: public DeferredCode { + public: + DeferredPostfixCountOperation(Register dst, + Register old, + bool is_increment, + TypeInfo input_type) + : dst_(dst), + old_(old), + is_increment_(is_increment), + input_type_(input_type) { + set_comment("[ DeferredCountOperation"); + } + + virtual void Generate(); + + private: + Register dst_; + Register old_; + bool is_increment_; + TypeInfo input_type_; +}; + + +void DeferredPostfixCountOperation::Generate() { + // Undo the optimistic smi operation. + if (is_increment_) { + __ sub(Operand(dst_), Immediate(Smi::FromInt(1))); + } else { + __ add(Operand(dst_), Immediate(Smi::FromInt(1))); + } + Register left; + if (input_type_.IsNumber()) { + __ push(dst_); // Save the input to use as the old value. + left = dst_; + } else { + __ push(dst_); + __ InvokeBuiltin(Builtins::TO_NUMBER, CALL_FUNCTION); + __ push(eax); // Save the result of ToNumber to use as the old value. + left = eax; + } + + GenericBinaryOpStub stub(is_increment_ ? Token::ADD : Token::SUB, + NO_OVERWRITE, + NO_GENERIC_BINARY_FLAGS, + TypeInfo::Number()); + stub.GenerateCall(masm_, left, Smi::FromInt(1)); + + if (!dst_.is(eax)) __ mov(dst_, eax); + __ pop(old_); +} + + +void CodeGenerator::VisitCountOperation(CountOperation* node) { + ASSERT(!in_safe_int32_mode()); + Comment cmnt(masm_, "[ CountOperation"); + + bool is_postfix = node->is_postfix(); + bool is_increment = node->op() == Token::INC; + + Variable* var = node->expression()->AsVariableProxy()->AsVariable(); + bool is_const = (var != NULL && var->mode() == Variable::CONST); + + // Postfix operations need a stack slot under the reference to hold + // the old value while the new value is being stored. This is so that + // in the case that storing the new value requires a call, the old + // value will be in the frame to be spilled. + if (is_postfix) frame_->Push(Smi::FromInt(0)); + + // A constant reference is not saved to, so a constant reference is not a + // compound assignment reference. + { Reference target(this, node->expression(), !is_const); + if (target.is_illegal()) { + // Spoof the virtual frame to have the expected height (one higher + // than on entry). + if (!is_postfix) frame_->Push(Smi::FromInt(0)); + return; + } + target.TakeValue(); + + Result new_value = frame_->Pop(); + new_value.ToRegister(); + + Result old_value; // Only allocated in the postfix case. + if (is_postfix) { + // Allocate a temporary to preserve the old value. + old_value = allocator_->Allocate(); + ASSERT(old_value.is_valid()); + __ mov(old_value.reg(), new_value.reg()); + + // The return value for postfix operations is ToNumber(input). + // Keep more precise type info if the input is some kind of + // number already. If the input is not a number we have to wait + // for the deferred code to convert it. + if (new_value.type_info().IsNumber()) { + old_value.set_type_info(new_value.type_info()); + } + } + + // Ensure the new value is writable. + frame_->Spill(new_value.reg()); + + Result tmp; + if (new_value.is_smi()) { + if (FLAG_debug_code) __ AbortIfNotSmi(new_value.reg()); + } else { + // We don't know statically if the input is a smi. + // In order to combine the overflow and the smi tag check, we need + // to be able to allocate a byte register. We attempt to do so + // without spilling. If we fail, we will generate separate overflow + // and smi tag checks. + // We allocate and clear a temporary byte register before performing + // the count operation since clearing the register using xor will clear + // the overflow flag. + tmp = allocator_->AllocateByteRegisterWithoutSpilling(); + if (tmp.is_valid()) { + __ Set(tmp.reg(), Immediate(0)); + } + } + + if (is_increment) { + __ add(Operand(new_value.reg()), Immediate(Smi::FromInt(1))); + } else { + __ sub(Operand(new_value.reg()), Immediate(Smi::FromInt(1))); + } + + DeferredCode* deferred = NULL; + if (is_postfix) { + deferred = new DeferredPostfixCountOperation(new_value.reg(), + old_value.reg(), + is_increment, + new_value.type_info()); + } else { + deferred = new DeferredPrefixCountOperation(new_value.reg(), + is_increment, + new_value.type_info()); + } + + if (new_value.is_smi()) { + // In case we have a smi as input just check for overflow. + deferred->Branch(overflow); + } else { + // If the count operation didn't overflow and the result is a valid + // smi, we're done. Otherwise, we jump to the deferred slow-case + // code. + // We combine the overflow and the smi tag check if we could + // successfully allocate a temporary byte register. + if (tmp.is_valid()) { + __ setcc(overflow, tmp.reg()); + __ or_(Operand(tmp.reg()), new_value.reg()); + __ test(tmp.reg(), Immediate(kSmiTagMask)); + tmp.Unuse(); + deferred->Branch(not_zero); + } else { + // Otherwise we test separately for overflow and smi tag. + deferred->Branch(overflow); + __ test(new_value.reg(), Immediate(kSmiTagMask)); + deferred->Branch(not_zero); + } + } + deferred->BindExit(); + + // Postfix count operations return their input converted to + // number. The case when the input is already a number is covered + // above in the allocation code for old_value. + if (is_postfix && !new_value.type_info().IsNumber()) { + old_value.set_type_info(TypeInfo::Number()); + } + + // The result of ++ or -- is an Integer32 if the + // input is a smi. Otherwise it is a number. + if (new_value.is_smi()) { + new_value.set_type_info(TypeInfo::Integer32()); + } else { + new_value.set_type_info(TypeInfo::Number()); + } + + // Postfix: store the old value in the allocated slot under the + // reference. + if (is_postfix) frame_->SetElementAt(target.size(), &old_value); + + frame_->Push(&new_value); + // Non-constant: update the reference. + if (!is_const) target.SetValue(NOT_CONST_INIT); + } + + // Postfix: drop the new value and use the old. + if (is_postfix) frame_->Drop(); +} + + +void CodeGenerator::Int32BinaryOperation(BinaryOperation* node) { + Token::Value op = node->op(); + Comment cmnt(masm_, "[ Int32BinaryOperation"); + ASSERT(in_safe_int32_mode()); + ASSERT(safe_int32_mode_enabled()); + ASSERT(FLAG_safe_int32_compiler); + + if (op == Token::COMMA) { + // Discard left value. + frame_->Nip(1); + return; + } + + Result right = frame_->Pop(); + Result left = frame_->Pop(); + + ASSERT(right.is_untagged_int32()); + ASSERT(left.is_untagged_int32()); + // Registers containing an int32 value are not multiply used. + ASSERT(!left.is_register() || !frame_->is_used(left.reg())); + ASSERT(!right.is_register() || !frame_->is_used(right.reg())); + + switch (op) { + case Token::COMMA: + case Token::OR: + case Token::AND: + UNREACHABLE(); + break; + case Token::BIT_OR: + case Token::BIT_XOR: + case Token::BIT_AND: + if (left.is_constant() || right.is_constant()) { + int32_t value; // Put constant in value, non-constant in left. + // Constants are known to be int32 values, from static analysis, + // or else will be converted to int32 by implicit ECMA [[ToInt32]]. + if (left.is_constant()) { + ASSERT(left.handle()->IsSmi() || left.handle()->IsHeapNumber()); + value = NumberToInt32(*left.handle()); + left = right; + } else { + ASSERT(right.handle()->IsSmi() || right.handle()->IsHeapNumber()); + value = NumberToInt32(*right.handle()); + } + + left.ToRegister(); + if (op == Token::BIT_OR) { + __ or_(Operand(left.reg()), Immediate(value)); + } else if (op == Token::BIT_XOR) { + __ xor_(Operand(left.reg()), Immediate(value)); + } else { + ASSERT(op == Token::BIT_AND); + __ and_(Operand(left.reg()), Immediate(value)); + } + } else { + ASSERT(left.is_register()); + ASSERT(right.is_register()); + if (op == Token::BIT_OR) { + __ or_(left.reg(), Operand(right.reg())); + } else if (op == Token::BIT_XOR) { + __ xor_(left.reg(), Operand(right.reg())); + } else { + ASSERT(op == Token::BIT_AND); + __ and_(left.reg(), Operand(right.reg())); + } + } + frame_->Push(&left); + right.Unuse(); + break; + case Token::SAR: + case Token::SHL: + case Token::SHR: { + bool test_shr_overflow = false; + left.ToRegister(); + if (right.is_constant()) { + ASSERT(right.handle()->IsSmi() || right.handle()->IsHeapNumber()); + int shift_amount = NumberToInt32(*right.handle()) & 0x1F; + if (op == Token::SAR) { + __ sar(left.reg(), shift_amount); + } else if (op == Token::SHL) { + __ shl(left.reg(), shift_amount); + } else { + ASSERT(op == Token::SHR); + __ shr(left.reg(), shift_amount); + if (shift_amount == 0) test_shr_overflow = true; + } + } else { + // Move right to ecx + if (left.is_register() && left.reg().is(ecx)) { + right.ToRegister(); + __ xchg(left.reg(), right.reg()); + left = right; // Left is unused here, copy of right unused by Push. + } else { + right.ToRegister(ecx); + left.ToRegister(); + } + if (op == Token::SAR) { + __ sar_cl(left.reg()); + } else if (op == Token::SHL) { + __ shl_cl(left.reg()); + } else { + ASSERT(op == Token::SHR); + __ shr_cl(left.reg()); + test_shr_overflow = true; + } + } + { + Register left_reg = left.reg(); + frame_->Push(&left); + right.Unuse(); + if (test_shr_overflow && !node->to_int32()) { + // Uint32 results with top bit set are not Int32 values. + // If they will be forced to Int32, skip the test. + // Test is needed because shr with shift amount 0 does not set flags. + __ test(left_reg, Operand(left_reg)); + unsafe_bailout_->Branch(sign); + } + } + break; + } + case Token::ADD: + case Token::SUB: + case Token::MUL: + if ((left.is_constant() && op != Token::SUB) || right.is_constant()) { + int32_t value; // Put constant in value, non-constant in left. + if (right.is_constant()) { + ASSERT(right.handle()->IsSmi() || right.handle()->IsHeapNumber()); + value = NumberToInt32(*right.handle()); + } else { + ASSERT(left.handle()->IsSmi() || left.handle()->IsHeapNumber()); + value = NumberToInt32(*left.handle()); + left = right; + } + + left.ToRegister(); + if (op == Token::ADD) { + __ add(Operand(left.reg()), Immediate(value)); + } else if (op == Token::SUB) { + __ sub(Operand(left.reg()), Immediate(value)); + } else { + ASSERT(op == Token::MUL); + __ imul(left.reg(), left.reg(), value); + } + } else { + left.ToRegister(); + ASSERT(left.is_register()); + ASSERT(right.is_register()); + if (op == Token::ADD) { + __ add(left.reg(), Operand(right.reg())); + } else if (op == Token::SUB) { + __ sub(left.reg(), Operand(right.reg())); + } else { + ASSERT(op == Token::MUL); + // We have statically verified that a negative zero can be ignored. + __ imul(left.reg(), Operand(right.reg())); + } + } + right.Unuse(); + frame_->Push(&left); + if (!node->to_int32() || op == Token::MUL) { + // If ToInt32 is called on the result of ADD, SUB, we don't + // care about overflows. + // Result of MUL can be non-representable precisely in double so + // we have to check for overflow. + unsafe_bailout_->Branch(overflow); + } + break; + case Token::DIV: + case Token::MOD: { + if (right.is_register() && (right.reg().is(eax) || right.reg().is(edx))) { + if (left.is_register() && left.reg().is(edi)) { + right.ToRegister(ebx); + } else { + right.ToRegister(edi); + } + } + left.ToRegister(eax); + Result edx_reg = allocator_->Allocate(edx); + right.ToRegister(); + // The results are unused here because BreakTarget::Branch cannot handle + // live results. + Register right_reg = right.reg(); + left.Unuse(); + right.Unuse(); + edx_reg.Unuse(); + __ cmp(right_reg, 0); + // Ensure divisor is positive: no chance of non-int32 or -0 result. + unsafe_bailout_->Branch(less_equal); + __ cdq(); // Sign-extend eax into edx:eax + __ idiv(right_reg); + if (op == Token::MOD) { + // Negative zero can arise as a negative divident with a zero result. + if (!node->no_negative_zero()) { + Label not_negative_zero; + __ test(edx, Operand(edx)); + __ j(not_zero, ¬_negative_zero); + __ test(eax, Operand(eax)); + unsafe_bailout_->Branch(negative); + __ bind(¬_negative_zero); + } + Result edx_result(edx, TypeInfo::Integer32()); + edx_result.set_untagged_int32(true); + frame_->Push(&edx_result); + } else { + ASSERT(op == Token::DIV); + __ test(edx, Operand(edx)); + unsafe_bailout_->Branch(not_equal); + Result eax_result(eax, TypeInfo::Integer32()); + eax_result.set_untagged_int32(true); + frame_->Push(&eax_result); + } + break; + } + default: + UNREACHABLE(); + break; + } +} + + +void CodeGenerator::GenerateLogicalBooleanOperation(BinaryOperation* node) { + // According to ECMA-262 section 11.11, page 58, the binary logical + // operators must yield the result of one of the two expressions + // before any ToBoolean() conversions. This means that the value + // produced by a && or || operator is not necessarily a boolean. + + // NOTE: If the left hand side produces a materialized value (not + // control flow), we force the right hand side to do the same. This + // is necessary because we assume that if we get control flow on the + // last path out of an expression we got it on all paths. + if (node->op() == Token::AND) { + ASSERT(!in_safe_int32_mode()); + JumpTarget is_true; + ControlDestination dest(&is_true, destination()->false_target(), true); + LoadCondition(node->left(), &dest, false); + + if (dest.false_was_fall_through()) { + // The current false target was used as the fall-through. If + // there are no dangling jumps to is_true then the left + // subexpression was unconditionally false. Otherwise we have + // paths where we do have to evaluate the right subexpression. + if (is_true.is_linked()) { + // We need to compile the right subexpression. If the jump to + // the current false target was a forward jump then we have a + // valid frame, we have just bound the false target, and we + // have to jump around the code for the right subexpression. + if (has_valid_frame()) { + destination()->false_target()->Unuse(); + destination()->false_target()->Jump(); + } + is_true.Bind(); + // The left subexpression compiled to control flow, so the + // right one is free to do so as well. + LoadCondition(node->right(), destination(), false); + } else { + // We have actually just jumped to or bound the current false + // target but the current control destination is not marked as + // used. + destination()->Use(false); + } + + } else if (dest.is_used()) { + // The left subexpression compiled to control flow (and is_true + // was just bound), so the right is free to do so as well. + LoadCondition(node->right(), destination(), false); + + } else { + // We have a materialized value on the frame, so we exit with + // one on all paths. There are possibly also jumps to is_true + // from nested subexpressions. + JumpTarget pop_and_continue; + JumpTarget exit; + + // Avoid popping the result if it converts to 'false' using the + // standard ToBoolean() conversion as described in ECMA-262, + // section 9.2, page 30. + // + // Duplicate the TOS value. The duplicate will be popped by + // ToBoolean. + frame_->Dup(); + ControlDestination dest(&pop_and_continue, &exit, true); + ToBoolean(&dest); + + // Pop the result of evaluating the first part. + frame_->Drop(); + + // Compile right side expression. + is_true.Bind(); + Load(node->right()); + + // Exit (always with a materialized value). + exit.Bind(); + } + + } else { + ASSERT(node->op() == Token::OR); + ASSERT(!in_safe_int32_mode()); + JumpTarget is_false; + ControlDestination dest(destination()->true_target(), &is_false, false); + LoadCondition(node->left(), &dest, false); + + if (dest.true_was_fall_through()) { + // The current true target was used as the fall-through. If + // there are no dangling jumps to is_false then the left + // subexpression was unconditionally true. Otherwise we have + // paths where we do have to evaluate the right subexpression. + if (is_false.is_linked()) { + // We need to compile the right subexpression. If the jump to + // the current true target was a forward jump then we have a + // valid frame, we have just bound the true target, and we + // have to jump around the code for the right subexpression. + if (has_valid_frame()) { + destination()->true_target()->Unuse(); + destination()->true_target()->Jump(); + } + is_false.Bind(); + // The left subexpression compiled to control flow, so the + // right one is free to do so as well. + LoadCondition(node->right(), destination(), false); + } else { + // We have just jumped to or bound the current true target but + // the current control destination is not marked as used. + destination()->Use(true); + } + + } else if (dest.is_used()) { + // The left subexpression compiled to control flow (and is_false + // was just bound), so the right is free to do so as well. + LoadCondition(node->right(), destination(), false); + + } else { + // We have a materialized value on the frame, so we exit with + // one on all paths. There are possibly also jumps to is_false + // from nested subexpressions. + JumpTarget pop_and_continue; + JumpTarget exit; + + // Avoid popping the result if it converts to 'true' using the + // standard ToBoolean() conversion as described in ECMA-262, + // section 9.2, page 30. + // + // Duplicate the TOS value. The duplicate will be popped by + // ToBoolean. + frame_->Dup(); + ControlDestination dest(&exit, &pop_and_continue, false); + ToBoolean(&dest); + + // Pop the result of evaluating the first part. + frame_->Drop(); + + // Compile right side expression. + is_false.Bind(); + Load(node->right()); + + // Exit (always with a materialized value). + exit.Bind(); + } + } +} + + +void CodeGenerator::VisitBinaryOperation(BinaryOperation* node) { + Comment cmnt(masm_, "[ BinaryOperation"); + + if (node->op() == Token::AND || node->op() == Token::OR) { + GenerateLogicalBooleanOperation(node); + } else if (in_safe_int32_mode()) { + Visit(node->left()); + Visit(node->right()); + Int32BinaryOperation(node); + } else { + // NOTE: The code below assumes that the slow cases (calls to runtime) + // never return a constant/immutable object. + OverwriteMode overwrite_mode = NO_OVERWRITE; + if (node->left()->ResultOverwriteAllowed()) { + overwrite_mode = OVERWRITE_LEFT; + } else if (node->right()->ResultOverwriteAllowed()) { + overwrite_mode = OVERWRITE_RIGHT; + } + + if (node->left()->IsTrivial()) { + Load(node->right()); + Result right = frame_->Pop(); + frame_->Push(node->left()); + frame_->Push(&right); + } else { + Load(node->left()); + Load(node->right()); + } + GenericBinaryOperation(node, overwrite_mode); + } +} + + +void CodeGenerator::VisitThisFunction(ThisFunction* node) { + ASSERT(!in_safe_int32_mode()); + frame_->PushFunction(); +} + + +void CodeGenerator::VisitCompareOperation(CompareOperation* node) { + ASSERT(!in_safe_int32_mode()); + Comment cmnt(masm_, "[ CompareOperation"); + + bool left_already_loaded = false; + + // Get the expressions from the node. + Expression* left = node->left(); + Expression* right = node->right(); + Token::Value op = node->op(); + // To make typeof testing for natives implemented in JavaScript really + // efficient, we generate special code for expressions of the form: + // 'typeof <expression> == <string>'. + UnaryOperation* operation = left->AsUnaryOperation(); + if ((op == Token::EQ || op == Token::EQ_STRICT) && + (operation != NULL && operation->op() == Token::TYPEOF) && + (right->AsLiteral() != NULL && + right->AsLiteral()->handle()->IsString())) { + Handle<String> check(String::cast(*right->AsLiteral()->handle())); + + // Load the operand and move it to a register. + LoadTypeofExpression(operation->expression()); + Result answer = frame_->Pop(); + answer.ToRegister(); + + if (check->Equals(HEAP->number_symbol())) { + __ test(answer.reg(), Immediate(kSmiTagMask)); + destination()->true_target()->Branch(zero); + frame_->Spill(answer.reg()); + __ mov(answer.reg(), FieldOperand(answer.reg(), HeapObject::kMapOffset)); + __ cmp(answer.reg(), FACTORY->heap_number_map()); + answer.Unuse(); + destination()->Split(equal); + + } else if (check->Equals(HEAP->string_symbol())) { + __ test(answer.reg(), Immediate(kSmiTagMask)); + destination()->false_target()->Branch(zero); + + // It can be an undetectable string object. + Result temp = allocator()->Allocate(); + ASSERT(temp.is_valid()); + __ mov(temp.reg(), FieldOperand(answer.reg(), HeapObject::kMapOffset)); + __ test_b(FieldOperand(temp.reg(), Map::kBitFieldOffset), + 1 << Map::kIsUndetectable); + destination()->false_target()->Branch(not_zero); + __ CmpInstanceType(temp.reg(), FIRST_NONSTRING_TYPE); + temp.Unuse(); + answer.Unuse(); + destination()->Split(below); + + } else if (check->Equals(HEAP->boolean_symbol())) { + __ cmp(answer.reg(), FACTORY->true_value()); + destination()->true_target()->Branch(equal); + __ cmp(answer.reg(), FACTORY->false_value()); + answer.Unuse(); + destination()->Split(equal); + + } else if (check->Equals(HEAP->undefined_symbol())) { + __ cmp(answer.reg(), FACTORY->undefined_value()); + destination()->true_target()->Branch(equal); + + __ test(answer.reg(), Immediate(kSmiTagMask)); + destination()->false_target()->Branch(zero); + + // It can be an undetectable object. + frame_->Spill(answer.reg()); + __ mov(answer.reg(), FieldOperand(answer.reg(), HeapObject::kMapOffset)); + __ test_b(FieldOperand(answer.reg(), Map::kBitFieldOffset), + 1 << Map::kIsUndetectable); + answer.Unuse(); + destination()->Split(not_zero); + + } else if (check->Equals(HEAP->function_symbol())) { + __ test(answer.reg(), Immediate(kSmiTagMask)); + destination()->false_target()->Branch(zero); + frame_->Spill(answer.reg()); + __ CmpObjectType(answer.reg(), JS_FUNCTION_TYPE, answer.reg()); + destination()->true_target()->Branch(equal); + // Regular expressions are callable so typeof == 'function'. + __ CmpInstanceType(answer.reg(), JS_REGEXP_TYPE); + answer.Unuse(); + destination()->Split(equal); + } else if (check->Equals(HEAP->object_symbol())) { + __ test(answer.reg(), Immediate(kSmiTagMask)); + destination()->false_target()->Branch(zero); + __ cmp(answer.reg(), FACTORY->null_value()); + destination()->true_target()->Branch(equal); + + Result map = allocator()->Allocate(); + ASSERT(map.is_valid()); + // Regular expressions are typeof == 'function', not 'object'. + __ CmpObjectType(answer.reg(), JS_REGEXP_TYPE, map.reg()); + destination()->false_target()->Branch(equal); + + // It can be an undetectable object. + __ test_b(FieldOperand(map.reg(), Map::kBitFieldOffset), + 1 << Map::kIsUndetectable); + destination()->false_target()->Branch(not_zero); + // Do a range test for JSObject type. We can't use + // MacroAssembler::IsInstanceJSObjectType, because we are using a + // ControlDestination, so we copy its implementation here. + __ movzx_b(map.reg(), FieldOperand(map.reg(), Map::kInstanceTypeOffset)); + __ sub(Operand(map.reg()), Immediate(FIRST_JS_OBJECT_TYPE)); + __ cmp(map.reg(), LAST_JS_OBJECT_TYPE - FIRST_JS_OBJECT_TYPE); + answer.Unuse(); + map.Unuse(); + destination()->Split(below_equal); + } else { + // Uncommon case: typeof testing against a string literal that is + // never returned from the typeof operator. + answer.Unuse(); + destination()->Goto(false); + } + return; + } else if (op == Token::LT && + right->AsLiteral() != NULL && + right->AsLiteral()->handle()->IsHeapNumber()) { + Handle<HeapNumber> check(HeapNumber::cast(*right->AsLiteral()->handle())); + if (check->value() == 2147483648.0) { // 0x80000000. + Load(left); + left_already_loaded = true; + Result lhs = frame_->Pop(); + lhs.ToRegister(); + __ test(lhs.reg(), Immediate(kSmiTagMask)); + destination()->true_target()->Branch(zero); // All Smis are less. + Result scratch = allocator()->Allocate(); + ASSERT(scratch.is_valid()); + __ mov(scratch.reg(), FieldOperand(lhs.reg(), HeapObject::kMapOffset)); + __ cmp(scratch.reg(), FACTORY->heap_number_map()); + JumpTarget not_a_number; + not_a_number.Branch(not_equal, &lhs); + __ mov(scratch.reg(), + FieldOperand(lhs.reg(), HeapNumber::kExponentOffset)); + __ cmp(Operand(scratch.reg()), Immediate(0xfff00000)); + not_a_number.Branch(above_equal, &lhs); // It's a negative NaN or -Inf. + const uint32_t borderline_exponent = + (HeapNumber::kExponentBias + 31) << HeapNumber::kExponentShift; + __ cmp(Operand(scratch.reg()), Immediate(borderline_exponent)); + scratch.Unuse(); + lhs.Unuse(); + destination()->true_target()->Branch(less); + destination()->false_target()->Jump(); + + not_a_number.Bind(&lhs); + frame_->Push(&lhs); + } + } + + Condition cc = no_condition; + bool strict = false; + switch (op) { + case Token::EQ_STRICT: + strict = true; + // Fall through + case Token::EQ: + cc = equal; + break; + case Token::LT: + cc = less; + break; + case Token::GT: + cc = greater; + break; + case Token::LTE: + cc = less_equal; + break; + case Token::GTE: + cc = greater_equal; + break; + case Token::IN: { + if (!left_already_loaded) Load(left); + Load(right); + Result answer = frame_->InvokeBuiltin(Builtins::IN, CALL_FUNCTION, 2); + frame_->Push(&answer); // push the result + return; + } + case Token::INSTANCEOF: { + if (!left_already_loaded) Load(left); + Load(right); + InstanceofStub stub(InstanceofStub::kNoFlags); + Result answer = frame_->CallStub(&stub, 2); + answer.ToRegister(); + __ test(answer.reg(), Operand(answer.reg())); + answer.Unuse(); + destination()->Split(zero); + return; + } + default: + UNREACHABLE(); + } + + if (left->IsTrivial()) { + if (!left_already_loaded) { + Load(right); + Result right_result = frame_->Pop(); + frame_->Push(left); + frame_->Push(&right_result); + } else { + Load(right); + } + } else { + if (!left_already_loaded) Load(left); + Load(right); + } + Comparison(node, cc, strict, destination()); +} + + +void CodeGenerator::VisitCompareToNull(CompareToNull* node) { + ASSERT(!in_safe_int32_mode()); + Comment cmnt(masm_, "[ CompareToNull"); + + Load(node->expression()); + Result operand = frame_->Pop(); + operand.ToRegister(); + __ cmp(operand.reg(), FACTORY->null_value()); + if (node->is_strict()) { + operand.Unuse(); + destination()->Split(equal); + } else { + // The 'null' value is only equal to 'undefined' if using non-strict + // comparisons. + destination()->true_target()->Branch(equal); + __ cmp(operand.reg(), FACTORY->undefined_value()); + destination()->true_target()->Branch(equal); + __ test(operand.reg(), Immediate(kSmiTagMask)); + destination()->false_target()->Branch(equal); + + // It can be an undetectable object. + // Use a scratch register in preference to spilling operand.reg(). + Result temp = allocator()->Allocate(); + ASSERT(temp.is_valid()); + __ mov(temp.reg(), + FieldOperand(operand.reg(), HeapObject::kMapOffset)); + __ test_b(FieldOperand(temp.reg(), Map::kBitFieldOffset), + 1 << Map::kIsUndetectable); + temp.Unuse(); + operand.Unuse(); + destination()->Split(not_zero); + } +} + + +#ifdef DEBUG +bool CodeGenerator::HasValidEntryRegisters() { + return (allocator()->count(eax) == (frame()->is_used(eax) ? 1 : 0)) + && (allocator()->count(ebx) == (frame()->is_used(ebx) ? 1 : 0)) + && (allocator()->count(ecx) == (frame()->is_used(ecx) ? 1 : 0)) + && (allocator()->count(edx) == (frame()->is_used(edx) ? 1 : 0)) + && (allocator()->count(edi) == (frame()->is_used(edi) ? 1 : 0)); +} +#endif + + +// Emit a LoadIC call to get the value from receiver and leave it in +// dst. +class DeferredReferenceGetNamedValue: public DeferredCode { + public: + DeferredReferenceGetNamedValue(Register dst, + Register receiver, + Handle<String> name, + bool is_contextual) + : dst_(dst), + receiver_(receiver), + name_(name), + is_contextual_(is_contextual), + is_dont_delete_(false) { + set_comment(is_contextual + ? "[ DeferredReferenceGetNamedValue (contextual)" + : "[ DeferredReferenceGetNamedValue"); + } + + virtual void Generate(); + + Label* patch_site() { return &patch_site_; } + + void set_is_dont_delete(bool value) { + ASSERT(is_contextual_); + is_dont_delete_ = value; + } + + private: + Label patch_site_; + Register dst_; + Register receiver_; + Handle<String> name_; + bool is_contextual_; + bool is_dont_delete_; +}; + + +void DeferredReferenceGetNamedValue::Generate() { + if (!receiver_.is(eax)) { + __ mov(eax, receiver_); + } + __ Set(ecx, Immediate(name_)); + Handle<Code> ic(masm()->isolate()->builtins()->builtin( + Builtins::kLoadIC_Initialize)); + RelocInfo::Mode mode = is_contextual_ + ? RelocInfo::CODE_TARGET_CONTEXT + : RelocInfo::CODE_TARGET; + __ call(ic, mode); + // The call must be followed by: + // - a test eax instruction to indicate that the inobject property + // case was inlined. + // - a mov ecx or mov edx instruction to indicate that the + // contextual property load was inlined. + // + // Store the delta to the map check instruction here in the test + // instruction. Use masm_-> instead of the __ macro since the + // latter can't return a value. + int delta_to_patch_site = masm_->SizeOfCodeGeneratedSince(patch_site()); + // Here we use masm_-> instead of the __ macro because this is the + // instruction that gets patched and coverage code gets in the way. + Counters* counters = masm()->isolate()->counters(); + if (is_contextual_) { + masm_->mov(is_dont_delete_ ? edx : ecx, -delta_to_patch_site); + __ IncrementCounter(counters->named_load_global_inline_miss(), 1); + if (is_dont_delete_) { + __ IncrementCounter(counters->dont_delete_hint_miss(), 1); + } + } else { + masm_->test(eax, Immediate(-delta_to_patch_site)); + __ IncrementCounter(counters->named_load_inline_miss(), 1); + } + + if (!dst_.is(eax)) __ mov(dst_, eax); +} + + +class DeferredReferenceGetKeyedValue: public DeferredCode { + public: + explicit DeferredReferenceGetKeyedValue(Register dst, + Register receiver, + Register key) + : dst_(dst), receiver_(receiver), key_(key) { + set_comment("[ DeferredReferenceGetKeyedValue"); + } + + virtual void Generate(); + + Label* patch_site() { return &patch_site_; } + + private: + Label patch_site_; + Register dst_; + Register receiver_; + Register key_; +}; + + +void DeferredReferenceGetKeyedValue::Generate() { + if (!receiver_.is(eax)) { + // Register eax is available for key. + if (!key_.is(eax)) { + __ mov(eax, key_); + } + if (!receiver_.is(edx)) { + __ mov(edx, receiver_); + } + } else if (!key_.is(edx)) { + // Register edx is available for receiver. + if (!receiver_.is(edx)) { + __ mov(edx, receiver_); + } + if (!key_.is(eax)) { + __ mov(eax, key_); + } + } else { + __ xchg(edx, eax); + } + // Calculate the delta from the IC call instruction to the map check + // cmp instruction in the inlined version. This delta is stored in + // a test(eax, delta) instruction after the call so that we can find + // it in the IC initialization code and patch the cmp instruction. + // This means that we cannot allow test instructions after calls to + // KeyedLoadIC stubs in other places. + Handle<Code> ic(masm()->isolate()->builtins()->builtin( + Builtins::kKeyedLoadIC_Initialize)); + __ call(ic, RelocInfo::CODE_TARGET); + // The delta from the start of the map-compare instruction to the + // test instruction. We use masm_-> directly here instead of the __ + // macro because the macro sometimes uses macro expansion to turn + // into something that can't return a value. This is encountered + // when doing generated code coverage tests. + int delta_to_patch_site = masm_->SizeOfCodeGeneratedSince(patch_site()); + // Here we use masm_-> instead of the __ macro because this is the + // instruction that gets patched and coverage code gets in the way. + masm_->test(eax, Immediate(-delta_to_patch_site)); + Counters* counters = masm()->isolate()->counters(); + __ IncrementCounter(counters->keyed_load_inline_miss(), 1); + + if (!dst_.is(eax)) __ mov(dst_, eax); +} + + +class DeferredReferenceSetKeyedValue: public DeferredCode { + public: + DeferredReferenceSetKeyedValue(Register value, + Register key, + Register receiver, + Register scratch, + StrictModeFlag strict_mode) + : value_(value), + key_(key), + receiver_(receiver), + scratch_(scratch), + strict_mode_(strict_mode) { + set_comment("[ DeferredReferenceSetKeyedValue"); + } + + virtual void Generate(); + + Label* patch_site() { return &patch_site_; } + + private: + Register value_; + Register key_; + Register receiver_; + Register scratch_; + Label patch_site_; + StrictModeFlag strict_mode_; +}; + + +void DeferredReferenceSetKeyedValue::Generate() { + Counters* counters = masm()->isolate()->counters(); + __ IncrementCounter(counters->keyed_store_inline_miss(), 1); + // Move value_ to eax, key_ to ecx, and receiver_ to edx. + Register old_value = value_; + + // First, move value to eax. + if (!value_.is(eax)) { + if (key_.is(eax)) { + // Move key_ out of eax, preferably to ecx. + if (!value_.is(ecx) && !receiver_.is(ecx)) { + __ mov(ecx, key_); + key_ = ecx; + } else { + __ mov(scratch_, key_); + key_ = scratch_; + } + } + if (receiver_.is(eax)) { + // Move receiver_ out of eax, preferably to edx. + if (!value_.is(edx) && !key_.is(edx)) { + __ mov(edx, receiver_); + receiver_ = edx; + } else { + // Both moves to scratch are from eax, also, no valid path hits both. + __ mov(scratch_, receiver_); + receiver_ = scratch_; + } + } + __ mov(eax, value_); + value_ = eax; + } + + // Now value_ is in eax. Move the other two to the right positions. + // We do not update the variables key_ and receiver_ to ecx and edx. + if (key_.is(ecx)) { + if (!receiver_.is(edx)) { + __ mov(edx, receiver_); + } + } else if (key_.is(edx)) { + if (receiver_.is(ecx)) { + __ xchg(edx, ecx); + } else { + __ mov(ecx, key_); + if (!receiver_.is(edx)) { + __ mov(edx, receiver_); + } + } + } else { // Key is not in edx or ecx. + if (!receiver_.is(edx)) { + __ mov(edx, receiver_); + } + __ mov(ecx, key_); + } + + // Call the IC stub. + Handle<Code> ic(masm()->isolate()->builtins()->builtin( + (strict_mode_ == kStrictMode) ? Builtins::kKeyedStoreIC_Initialize_Strict + : Builtins::kKeyedStoreIC_Initialize)); + __ call(ic, RelocInfo::CODE_TARGET); + // The delta from the start of the map-compare instruction to the + // test instruction. We use masm_-> directly here instead of the + // __ macro because the macro sometimes uses macro expansion to turn + // into something that can't return a value. This is encountered + // when doing generated code coverage tests. + int delta_to_patch_site = masm_->SizeOfCodeGeneratedSince(patch_site()); + // Here we use masm_-> instead of the __ macro because this is the + // instruction that gets patched and coverage code gets in the way. + masm_->test(eax, Immediate(-delta_to_patch_site)); + // Restore value (returned from store IC) register. + if (!old_value.is(eax)) __ mov(old_value, eax); +} + + +Result CodeGenerator::EmitNamedLoad(Handle<String> name, bool is_contextual) { +#ifdef DEBUG + int original_height = frame()->height(); +#endif + + Isolate* isolate = masm()->isolate(); + Factory* factory = isolate->factory(); + Counters* counters = isolate->counters(); + + bool contextual_load_in_builtin = + is_contextual && + (isolate->bootstrapper()->IsActive() || + (!info_->closure().is_null() && info_->closure()->IsBuiltin())); + + Result result; + // Do not inline in the global code or when not in loop. + if (scope()->is_global_scope() || + loop_nesting() == 0 || + contextual_load_in_builtin) { + Comment cmnt(masm(), "[ Load from named Property"); + frame()->Push(name); + + RelocInfo::Mode mode = is_contextual + ? RelocInfo::CODE_TARGET_CONTEXT + : RelocInfo::CODE_TARGET; + result = frame()->CallLoadIC(mode); + // A test eax instruction following the call signals that the inobject + // property case was inlined. Ensure that there is not a test eax + // instruction here. + __ nop(); + } else { + // Inline the property load. + Comment cmnt(masm(), is_contextual + ? "[ Inlined contextual property load" + : "[ Inlined named property load"); + Result receiver = frame()->Pop(); + receiver.ToRegister(); + + result = allocator()->Allocate(); + ASSERT(result.is_valid()); + DeferredReferenceGetNamedValue* deferred = + new DeferredReferenceGetNamedValue(result.reg(), + receiver.reg(), + name, + is_contextual); + + if (!is_contextual) { + // Check that the receiver is a heap object. + __ test(receiver.reg(), Immediate(kSmiTagMask)); + deferred->Branch(zero); + } + + __ bind(deferred->patch_site()); + // This is the map check instruction that will be patched (so we can't + // use the double underscore macro that may insert instructions). + // Initially use an invalid map to force a failure. + masm()->cmp(FieldOperand(receiver.reg(), HeapObject::kMapOffset), + Immediate(factory->null_value())); + // This branch is always a forwards branch so it's always a fixed size + // which allows the assert below to succeed and patching to work. + deferred->Branch(not_equal); + + // The delta from the patch label to the actual load must be + // statically known. + ASSERT(masm()->SizeOfCodeGeneratedSince(deferred->patch_site()) == + LoadIC::kOffsetToLoadInstruction); + + if (is_contextual) { + // Load the (initialy invalid) cell and get its value. + masm()->mov(result.reg(), factory->null_value()); + if (FLAG_debug_code) { + __ cmp(FieldOperand(result.reg(), HeapObject::kMapOffset), + factory->global_property_cell_map()); + __ Assert(equal, "Uninitialized inlined contextual load"); + } + __ mov(result.reg(), + FieldOperand(result.reg(), JSGlobalPropertyCell::kValueOffset)); + __ cmp(result.reg(), factory->the_hole_value()); + deferred->Branch(equal); + bool is_dont_delete = false; + if (!info_->closure().is_null()) { + // When doing lazy compilation we can check if the global cell + // already exists and use its "don't delete" status as a hint. + AssertNoAllocation no_gc; + v8::internal::GlobalObject* global_object = + info_->closure()->context()->global(); + LookupResult lookup; + global_object->LocalLookupRealNamedProperty(*name, &lookup); + if (lookup.IsProperty() && lookup.type() == NORMAL) { + ASSERT(lookup.holder() == global_object); + ASSERT(global_object->property_dictionary()->ValueAt( + lookup.GetDictionaryEntry())->IsJSGlobalPropertyCell()); + is_dont_delete = lookup.IsDontDelete(); + } + } + deferred->set_is_dont_delete(is_dont_delete); + if (!is_dont_delete) { + __ cmp(result.reg(), factory->the_hole_value()); + deferred->Branch(equal); + } else if (FLAG_debug_code) { + __ cmp(result.reg(), factory->the_hole_value()); + __ Check(not_equal, "DontDelete cells can't contain the hole"); + } + __ IncrementCounter(counters->named_load_global_inline(), 1); + if (is_dont_delete) { + __ IncrementCounter(counters->dont_delete_hint_hit(), 1); + } + } else { + // The initial (invalid) offset has to be large enough to force a 32-bit + // instruction encoding to allow patching with an arbitrary offset. Use + // kMaxInt (minus kHeapObjectTag). + int offset = kMaxInt; + masm()->mov(result.reg(), FieldOperand(receiver.reg(), offset)); + __ IncrementCounter(counters->named_load_inline(), 1); + } + + deferred->BindExit(); + } + ASSERT(frame()->height() == original_height - 1); + return result; +} + + +Result CodeGenerator::EmitNamedStore(Handle<String> name, bool is_contextual) { +#ifdef DEBUG + int expected_height = frame()->height() - (is_contextual ? 1 : 2); +#endif + + Result result; + if (is_contextual || scope()->is_global_scope() || loop_nesting() == 0) { + result = frame()->CallStoreIC(name, is_contextual, strict_mode_flag()); + // A test eax instruction following the call signals that the inobject + // property case was inlined. Ensure that there is not a test eax + // instruction here. + __ nop(); + } else { + // Inline the in-object property case. + JumpTarget slow, done; + Label patch_site; + + // Get the value and receiver from the stack. + Result value = frame()->Pop(); + value.ToRegister(); + Result receiver = frame()->Pop(); + receiver.ToRegister(); + + // Allocate result register. + result = allocator()->Allocate(); + ASSERT(result.is_valid() && receiver.is_valid() && value.is_valid()); + + // Check that the receiver is a heap object. + __ test(receiver.reg(), Immediate(kSmiTagMask)); + slow.Branch(zero, &value, &receiver); + + // This is the map check instruction that will be patched (so we can't + // use the double underscore macro that may insert instructions). + // Initially use an invalid map to force a failure. + __ bind(&patch_site); + masm()->cmp(FieldOperand(receiver.reg(), HeapObject::kMapOffset), + Immediate(FACTORY->null_value())); + // This branch is always a forwards branch so it's always a fixed size + // which allows the assert below to succeed and patching to work. + slow.Branch(not_equal, &value, &receiver); + + // The delta from the patch label to the store offset must be + // statically known. + ASSERT(masm()->SizeOfCodeGeneratedSince(&patch_site) == + StoreIC::kOffsetToStoreInstruction); + + // The initial (invalid) offset has to be large enough to force a 32-bit + // instruction encoding to allow patching with an arbitrary offset. Use + // kMaxInt (minus kHeapObjectTag). + int offset = kMaxInt; + __ mov(FieldOperand(receiver.reg(), offset), value.reg()); + __ mov(result.reg(), Operand(value.reg())); + + // Allocate scratch register for write barrier. + Result scratch = allocator()->Allocate(); + ASSERT(scratch.is_valid()); + + // The write barrier clobbers all input registers, so spill the + // receiver and the value. + frame_->Spill(receiver.reg()); + frame_->Spill(value.reg()); + + // If the receiver and the value share a register allocate a new + // register for the receiver. + if (receiver.reg().is(value.reg())) { + receiver = allocator()->Allocate(); + ASSERT(receiver.is_valid()); + __ mov(receiver.reg(), Operand(value.reg())); + } + + // Update the write barrier. To save instructions in the inlined + // version we do not filter smis. + Label skip_write_barrier; + __ InNewSpace(receiver.reg(), value.reg(), equal, &skip_write_barrier); + int delta_to_record_write = masm_->SizeOfCodeGeneratedSince(&patch_site); + __ lea(scratch.reg(), Operand(receiver.reg(), offset)); + __ RecordWriteHelper(receiver.reg(), scratch.reg(), value.reg()); + if (FLAG_debug_code) { + __ mov(receiver.reg(), Immediate(BitCast<int32_t>(kZapValue))); + __ mov(value.reg(), Immediate(BitCast<int32_t>(kZapValue))); + __ mov(scratch.reg(), Immediate(BitCast<int32_t>(kZapValue))); + } + __ bind(&skip_write_barrier); + value.Unuse(); + scratch.Unuse(); + receiver.Unuse(); + done.Jump(&result); + + slow.Bind(&value, &receiver); + frame()->Push(&receiver); + frame()->Push(&value); + result = frame()->CallStoreIC(name, is_contextual, strict_mode_flag()); + // Encode the offset to the map check instruction and the offset + // to the write barrier store address computation in a test eax + // instruction. + int delta_to_patch_site = masm_->SizeOfCodeGeneratedSince(&patch_site); + __ test(eax, + Immediate((delta_to_record_write << 16) | delta_to_patch_site)); + done.Bind(&result); + } + + ASSERT_EQ(expected_height, frame()->height()); + return result; +} + + +Result CodeGenerator::EmitKeyedLoad() { +#ifdef DEBUG + int original_height = frame()->height(); +#endif + Result result; + // Inline array load code if inside of a loop. We do not know the + // receiver map yet, so we initially generate the code with a check + // against an invalid map. In the inline cache code, we patch the map + // check if appropriate. + if (loop_nesting() > 0) { + Comment cmnt(masm_, "[ Inlined load from keyed Property"); + + // Use a fresh temporary to load the elements without destroying + // the receiver which is needed for the deferred slow case. + Result elements = allocator()->Allocate(); + ASSERT(elements.is_valid()); + + Result key = frame_->Pop(); + Result receiver = frame_->Pop(); + key.ToRegister(); + receiver.ToRegister(); + + // If key and receiver are shared registers on the frame, their values will + // be automatically saved and restored when going to deferred code. + // The result is in elements, which is guaranteed non-shared. + DeferredReferenceGetKeyedValue* deferred = + new DeferredReferenceGetKeyedValue(elements.reg(), + receiver.reg(), + key.reg()); + + __ test(receiver.reg(), Immediate(kSmiTagMask)); + deferred->Branch(zero); + + // Check that the receiver has the expected map. + // Initially, use an invalid map. The map is patched in the IC + // initialization code. + __ bind(deferred->patch_site()); + // Use masm-> here instead of the double underscore macro since extra + // coverage code can interfere with the patching. + masm_->cmp(FieldOperand(receiver.reg(), HeapObject::kMapOffset), + Immediate(FACTORY->null_value())); + deferred->Branch(not_equal); + + // Check that the key is a smi. + if (!key.is_smi()) { + __ test(key.reg(), Immediate(kSmiTagMask)); + deferred->Branch(not_zero); + } else { + if (FLAG_debug_code) __ AbortIfNotSmi(key.reg()); + } + + // Get the elements array from the receiver. + __ mov(elements.reg(), + FieldOperand(receiver.reg(), JSObject::kElementsOffset)); + __ AssertFastElements(elements.reg()); + + // Check that the key is within bounds. + __ cmp(key.reg(), + FieldOperand(elements.reg(), FixedArray::kLengthOffset)); + deferred->Branch(above_equal); + + // Load and check that the result is not the hole. + // Key holds a smi. + STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize == 1); + __ mov(elements.reg(), + FieldOperand(elements.reg(), + key.reg(), + times_2, + FixedArray::kHeaderSize)); + result = elements; + __ cmp(Operand(result.reg()), Immediate(FACTORY->the_hole_value())); + deferred->Branch(equal); + __ IncrementCounter(masm_->isolate()->counters()->keyed_load_inline(), 1); + + deferred->BindExit(); + } else { + Comment cmnt(masm_, "[ Load from keyed Property"); + result = frame_->CallKeyedLoadIC(RelocInfo::CODE_TARGET); + // Make sure that we do not have a test instruction after the + // call. A test instruction after the call is used to + // indicate that we have generated an inline version of the + // keyed load. The explicit nop instruction is here because + // the push that follows might be peep-hole optimized away. + __ nop(); + } + ASSERT(frame()->height() == original_height - 2); + return result; +} + + +Result CodeGenerator::EmitKeyedStore(StaticType* key_type) { +#ifdef DEBUG + int original_height = frame()->height(); +#endif + Result result; + // Generate inlined version of the keyed store if the code is in a loop + // and the key is likely to be a smi. + if (loop_nesting() > 0 && key_type->IsLikelySmi()) { + Comment cmnt(masm(), "[ Inlined store to keyed Property"); + + // Get the receiver, key and value into registers. + result = frame()->Pop(); + Result key = frame()->Pop(); + Result receiver = frame()->Pop(); + + Result tmp = allocator_->Allocate(); + ASSERT(tmp.is_valid()); + Result tmp2 = allocator_->Allocate(); + ASSERT(tmp2.is_valid()); + + // Determine whether the value is a constant before putting it in a + // register. + bool value_is_constant = result.is_constant(); + + // Make sure that value, key and receiver are in registers. + result.ToRegister(); + key.ToRegister(); + receiver.ToRegister(); + + DeferredReferenceSetKeyedValue* deferred = + new DeferredReferenceSetKeyedValue(result.reg(), + key.reg(), + receiver.reg(), + tmp.reg(), + strict_mode_flag()); + + // Check that the receiver is not a smi. + __ test(receiver.reg(), Immediate(kSmiTagMask)); + deferred->Branch(zero); + + // Check that the key is a smi. + if (!key.is_smi()) { + __ test(key.reg(), Immediate(kSmiTagMask)); + deferred->Branch(not_zero); + } else { + if (FLAG_debug_code) __ AbortIfNotSmi(key.reg()); + } + + // Check that the receiver is a JSArray. + __ CmpObjectType(receiver.reg(), JS_ARRAY_TYPE, tmp.reg()); + deferred->Branch(not_equal); + + // Get the elements array from the receiver and check that it is not a + // dictionary. + __ mov(tmp.reg(), + FieldOperand(receiver.reg(), JSArray::kElementsOffset)); + + // Check whether it is possible to omit the write barrier. If the elements + // array is in new space or the value written is a smi we can safely update + // the elements array without write barrier. + Label in_new_space; + __ InNewSpace(tmp.reg(), tmp2.reg(), equal, &in_new_space); + if (!value_is_constant) { + __ test(result.reg(), Immediate(kSmiTagMask)); + deferred->Branch(not_zero); + } + + __ bind(&in_new_space); + // Bind the deferred code patch site to be able to locate the fixed + // array map comparison. When debugging, we patch this comparison to + // always fail so that we will hit the IC call in the deferred code + // which will allow the debugger to break for fast case stores. + __ bind(deferred->patch_site()); + __ cmp(FieldOperand(tmp.reg(), HeapObject::kMapOffset), + Immediate(FACTORY->fixed_array_map())); + deferred->Branch(not_equal); + + // Check that the key is within bounds. Both the key and the length of + // the JSArray are smis (because the fixed array check above ensures the + // elements are in fast case). Use unsigned comparison to handle negative + // keys. + __ cmp(key.reg(), + FieldOperand(receiver.reg(), JSArray::kLengthOffset)); + deferred->Branch(above_equal); + + // Store the value. + __ mov(FixedArrayElementOperand(tmp.reg(), key.reg()), result.reg()); + __ IncrementCounter(masm_->isolate()->counters()->keyed_store_inline(), 1); + + deferred->BindExit(); + } else { + result = frame()->CallKeyedStoreIC(strict_mode_flag()); + // Make sure that we do not have a test instruction after the + // call. A test instruction after the call is used to + // indicate that we have generated an inline version of the + // keyed store. + __ nop(); + } + ASSERT(frame()->height() == original_height - 3); + return result; +} + + +#undef __ +#define __ ACCESS_MASM(masm) + + +Handle<String> Reference::GetName() { + ASSERT(type_ == NAMED); + Property* property = expression_->AsProperty(); + if (property == NULL) { + // Global variable reference treated as a named property reference. + VariableProxy* proxy = expression_->AsVariableProxy(); + ASSERT(proxy->AsVariable() != NULL); + ASSERT(proxy->AsVariable()->is_global()); + return proxy->name(); + } else { + Literal* raw_name = property->key()->AsLiteral(); + ASSERT(raw_name != NULL); + return Handle<String>::cast(raw_name->handle()); + } +} + + +void Reference::GetValue() { + ASSERT(!cgen_->in_spilled_code()); + ASSERT(cgen_->HasValidEntryRegisters()); + ASSERT(!is_illegal()); + MacroAssembler* masm = cgen_->masm(); + + // Record the source position for the property load. + Property* property = expression_->AsProperty(); + if (property != NULL) { + cgen_->CodeForSourcePosition(property->position()); + } + + switch (type_) { + case SLOT: { + Comment cmnt(masm, "[ Load from Slot"); + Slot* slot = expression_->AsVariableProxy()->AsVariable()->AsSlot(); + ASSERT(slot != NULL); + cgen_->LoadFromSlotCheckForArguments(slot, NOT_INSIDE_TYPEOF); + if (!persist_after_get_) set_unloaded(); + break; + } + + case NAMED: { + Variable* var = expression_->AsVariableProxy()->AsVariable(); + bool is_global = var != NULL; + ASSERT(!is_global || var->is_global()); + if (persist_after_get_) cgen_->frame()->Dup(); + Result result = cgen_->EmitNamedLoad(GetName(), is_global); + if (!persist_after_get_) set_unloaded(); + cgen_->frame()->Push(&result); + break; + } + + case KEYED: { + if (persist_after_get_) { + cgen_->frame()->PushElementAt(1); + cgen_->frame()->PushElementAt(1); + } + Result value = cgen_->EmitKeyedLoad(); + cgen_->frame()->Push(&value); + if (!persist_after_get_) set_unloaded(); + break; + } + + default: + UNREACHABLE(); + } +} + + +void Reference::TakeValue() { + // For non-constant frame-allocated slots, we invalidate the value in the + // slot. For all others, we fall back on GetValue. + ASSERT(!cgen_->in_spilled_code()); + ASSERT(!is_illegal()); + if (type_ != SLOT) { + GetValue(); + return; + } + + Slot* slot = expression_->AsVariableProxy()->AsVariable()->AsSlot(); + ASSERT(slot != NULL); + if (slot->type() == Slot::LOOKUP || + slot->type() == Slot::CONTEXT || + slot->var()->mode() == Variable::CONST || + slot->is_arguments()) { + GetValue(); + return; + } + + // Only non-constant, frame-allocated parameters and locals can + // reach here. Be careful not to use the optimizations for arguments + // object access since it may not have been initialized yet. + ASSERT(!slot->is_arguments()); + if (slot->type() == Slot::PARAMETER) { + cgen_->frame()->TakeParameterAt(slot->index()); + } else { + ASSERT(slot->type() == Slot::LOCAL); + cgen_->frame()->TakeLocalAt(slot->index()); + } + + ASSERT(persist_after_get_); + // Do not unload the reference, because it is used in SetValue. +} + + +void Reference::SetValue(InitState init_state) { + ASSERT(cgen_->HasValidEntryRegisters()); + ASSERT(!is_illegal()); + MacroAssembler* masm = cgen_->masm(); + switch (type_) { + case SLOT: { + Comment cmnt(masm, "[ Store to Slot"); + Slot* slot = expression_->AsVariableProxy()->AsVariable()->AsSlot(); + ASSERT(slot != NULL); + cgen_->StoreToSlot(slot, init_state); + set_unloaded(); + break; + } + + case NAMED: { + Comment cmnt(masm, "[ Store to named Property"); + Result answer = cgen_->EmitNamedStore(GetName(), false); + cgen_->frame()->Push(&answer); + set_unloaded(); + break; + } + + case KEYED: { + Comment cmnt(masm, "[ Store to keyed Property"); + Property* property = expression()->AsProperty(); + ASSERT(property != NULL); + + Result answer = cgen_->EmitKeyedStore(property->key()->type()); + cgen_->frame()->Push(&answer); + set_unloaded(); + break; + } + + case UNLOADED: + case ILLEGAL: + UNREACHABLE(); + } +} + + +#undef __ + +#define __ masm. + + +static void MemCopyWrapper(void* dest, const void* src, size_t size) { + memcpy(dest, src, size); +} + + +OS::MemCopyFunction CreateMemCopyFunction() { + size_t actual_size; + // Allocate buffer in executable space. + byte* buffer = static_cast<byte*>(OS::Allocate(1 * KB, + &actual_size, + true)); + if (buffer == NULL) return &MemCopyWrapper; + MacroAssembler masm(NULL, buffer, static_cast<int>(actual_size)); + + // Generated code is put into a fixed, unmovable, buffer, and not into + // the V8 heap. We can't, and don't, refer to any relocatable addresses + // (e.g. the JavaScript nan-object). + + // 32-bit C declaration function calls pass arguments on stack. + + // Stack layout: + // esp[12]: Third argument, size. + // esp[8]: Second argument, source pointer. + // esp[4]: First argument, destination pointer. + // esp[0]: return address + + const int kDestinationOffset = 1 * kPointerSize; + const int kSourceOffset = 2 * kPointerSize; + const int kSizeOffset = 3 * kPointerSize; + + int stack_offset = 0; // Update if we change the stack height. + + if (FLAG_debug_code) { + __ cmp(Operand(esp, kSizeOffset + stack_offset), + Immediate(OS::kMinComplexMemCopy)); + Label ok; + __ j(greater_equal, &ok); + __ int3(); + __ bind(&ok); + } + if (CpuFeatures::IsSupported(SSE2)) { + CpuFeatures::Scope enable(SSE2); + __ push(edi); + __ push(esi); + stack_offset += 2 * kPointerSize; + Register dst = edi; + Register src = esi; + Register count = ecx; + __ mov(dst, Operand(esp, stack_offset + kDestinationOffset)); + __ mov(src, Operand(esp, stack_offset + kSourceOffset)); + __ mov(count, Operand(esp, stack_offset + kSizeOffset)); + + + __ movdqu(xmm0, Operand(src, 0)); + __ movdqu(Operand(dst, 0), xmm0); + __ mov(edx, dst); + __ and_(edx, 0xF); + __ neg(edx); + __ add(Operand(edx), Immediate(16)); + __ add(dst, Operand(edx)); + __ add(src, Operand(edx)); + __ sub(Operand(count), edx); + + // edi is now aligned. Check if esi is also aligned. + Label unaligned_source; + __ test(Operand(src), Immediate(0x0F)); + __ j(not_zero, &unaligned_source); + { + // Copy loop for aligned source and destination. + __ mov(edx, count); + Register loop_count = ecx; + Register count = edx; + __ shr(loop_count, 5); + { + // Main copy loop. + Label loop; + __ bind(&loop); + __ prefetch(Operand(src, 0x20), 1); + __ movdqa(xmm0, Operand(src, 0x00)); + __ movdqa(xmm1, Operand(src, 0x10)); + __ add(Operand(src), Immediate(0x20)); + + __ movdqa(Operand(dst, 0x00), xmm0); + __ movdqa(Operand(dst, 0x10), xmm1); + __ add(Operand(dst), Immediate(0x20)); + + __ dec(loop_count); + __ j(not_zero, &loop); + } + + // At most 31 bytes to copy. + Label move_less_16; + __ test(Operand(count), Immediate(0x10)); + __ j(zero, &move_less_16); + __ movdqa(xmm0, Operand(src, 0)); + __ add(Operand(src), Immediate(0x10)); + __ movdqa(Operand(dst, 0), xmm0); + __ add(Operand(dst), Immediate(0x10)); + __ bind(&move_less_16); + + // At most 15 bytes to copy. Copy 16 bytes at end of string. + __ and_(count, 0xF); + __ movdqu(xmm0, Operand(src, count, times_1, -0x10)); + __ movdqu(Operand(dst, count, times_1, -0x10), xmm0); + + __ mov(eax, Operand(esp, stack_offset + kDestinationOffset)); + __ pop(esi); + __ pop(edi); + __ ret(0); + } + __ Align(16); + { + // Copy loop for unaligned source and aligned destination. + // If source is not aligned, we can't read it as efficiently. + __ bind(&unaligned_source); + __ mov(edx, ecx); + Register loop_count = ecx; + Register count = edx; + __ shr(loop_count, 5); + { + // Main copy loop + Label loop; + __ bind(&loop); + __ prefetch(Operand(src, 0x20), 1); + __ movdqu(xmm0, Operand(src, 0x00)); + __ movdqu(xmm1, Operand(src, 0x10)); + __ add(Operand(src), Immediate(0x20)); + + __ movdqa(Operand(dst, 0x00), xmm0); + __ movdqa(Operand(dst, 0x10), xmm1); + __ add(Operand(dst), Immediate(0x20)); + + __ dec(loop_count); + __ j(not_zero, &loop); + } + + // At most 31 bytes to copy. + Label move_less_16; + __ test(Operand(count), Immediate(0x10)); + __ j(zero, &move_less_16); + __ movdqu(xmm0, Operand(src, 0)); + __ add(Operand(src), Immediate(0x10)); + __ movdqa(Operand(dst, 0), xmm0); + __ add(Operand(dst), Immediate(0x10)); + __ bind(&move_less_16); + + // At most 15 bytes to copy. Copy 16 bytes at end of string. + __ and_(count, 0x0F); + __ movdqu(xmm0, Operand(src, count, times_1, -0x10)); + __ movdqu(Operand(dst, count, times_1, -0x10), xmm0); + + __ mov(eax, Operand(esp, stack_offset + kDestinationOffset)); + __ pop(esi); + __ pop(edi); + __ ret(0); + } + + } else { + // SSE2 not supported. Unlikely to happen in practice. + __ push(edi); + __ push(esi); + stack_offset += 2 * kPointerSize; + __ cld(); + Register dst = edi; + Register src = esi; + Register count = ecx; + __ mov(dst, Operand(esp, stack_offset + kDestinationOffset)); + __ mov(src, Operand(esp, stack_offset + kSourceOffset)); + __ mov(count, Operand(esp, stack_offset + kSizeOffset)); + + // Copy the first word. + __ mov(eax, Operand(src, 0)); + __ mov(Operand(dst, 0), eax); + + // Increment src,dstso that dst is aligned. + __ mov(edx, dst); + __ and_(edx, 0x03); + __ neg(edx); + __ add(Operand(edx), Immediate(4)); // edx = 4 - (dst & 3) + __ add(dst, Operand(edx)); + __ add(src, Operand(edx)); + __ sub(Operand(count), edx); + // edi is now aligned, ecx holds number of remaning bytes to copy. + + __ mov(edx, count); + count = edx; + __ shr(ecx, 2); // Make word count instead of byte count. + __ rep_movs(); + + // At most 3 bytes left to copy. Copy 4 bytes at end of string. + __ and_(count, 3); + __ mov(eax, Operand(src, count, times_1, -4)); + __ mov(Operand(dst, count, times_1, -4), eax); + + __ mov(eax, Operand(esp, stack_offset + kDestinationOffset)); + __ pop(esi); + __ pop(edi); + __ ret(0); + } + + CodeDesc desc; + masm.GetCode(&desc); + ASSERT(desc.reloc_size == 0); + + CPU::FlushICache(buffer, actual_size); + return FUNCTION_CAST<OS::MemCopyFunction>(buffer); +} + +#undef __ + +} } // namespace v8::internal + +#endif // V8_TARGET_ARCH_IA32 |