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Diffstat (limited to 'src/3rdparty/v8/src/ia32/debug-ia32.cc')
| -rw-r--r-- | src/3rdparty/v8/src/ia32/debug-ia32.cc | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/src/3rdparty/v8/src/ia32/debug-ia32.cc b/src/3rdparty/v8/src/ia32/debug-ia32.cc new file mode 100644 index 0000000..33c5251 --- /dev/null +++ b/src/3rdparty/v8/src/ia32/debug-ia32.cc @@ -0,0 +1,312 @@ +// 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 "debug.h" + + +namespace v8 { +namespace internal { + +#ifdef ENABLE_DEBUGGER_SUPPORT + +bool BreakLocationIterator::IsDebugBreakAtReturn() { + return Debug::IsDebugBreakAtReturn(rinfo()); +} + + +// Patch the JS frame exit code with a debug break call. See +// CodeGenerator::VisitReturnStatement and VirtualFrame::Exit in codegen-ia32.cc +// for the precise return instructions sequence. +void BreakLocationIterator::SetDebugBreakAtReturn() { + ASSERT(Assembler::kJSReturnSequenceLength >= + Assembler::kCallInstructionLength); + Isolate* isolate = Isolate::Current(); + rinfo()->PatchCodeWithCall(isolate->debug()->debug_break_return()->entry(), + Assembler::kJSReturnSequenceLength - Assembler::kCallInstructionLength); +} + + +// Restore the JS frame exit code. +void BreakLocationIterator::ClearDebugBreakAtReturn() { + rinfo()->PatchCode(original_rinfo()->pc(), + Assembler::kJSReturnSequenceLength); +} + + +// A debug break in the frame exit code is identified by the JS frame exit code +// having been patched with a call instruction. +bool Debug::IsDebugBreakAtReturn(RelocInfo* rinfo) { + ASSERT(RelocInfo::IsJSReturn(rinfo->rmode())); + return rinfo->IsPatchedReturnSequence(); +} + + +bool BreakLocationIterator::IsDebugBreakAtSlot() { + ASSERT(IsDebugBreakSlot()); + // Check whether the debug break slot instructions have been patched. + return rinfo()->IsPatchedDebugBreakSlotSequence(); +} + + +void BreakLocationIterator::SetDebugBreakAtSlot() { + ASSERT(IsDebugBreakSlot()); + Isolate* isolate = Isolate::Current(); + rinfo()->PatchCodeWithCall( + isolate->debug()->debug_break_slot()->entry(), + Assembler::kDebugBreakSlotLength - Assembler::kCallInstructionLength); +} + + +void BreakLocationIterator::ClearDebugBreakAtSlot() { + ASSERT(IsDebugBreakSlot()); + rinfo()->PatchCode(original_rinfo()->pc(), Assembler::kDebugBreakSlotLength); +} + + +#define __ ACCESS_MASM(masm) + + +static void Generate_DebugBreakCallHelper(MacroAssembler* masm, + RegList object_regs, + RegList non_object_regs, + bool convert_call_to_jmp) { + // Enter an internal frame. + __ EnterInternalFrame(); + + // Store the registers containing live values on the expression stack to + // make sure that these are correctly updated during GC. Non object values + // are stored as a smi causing it to be untouched by GC. + ASSERT((object_regs & ~kJSCallerSaved) == 0); + ASSERT((non_object_regs & ~kJSCallerSaved) == 0); + ASSERT((object_regs & non_object_regs) == 0); + for (int i = 0; i < kNumJSCallerSaved; i++) { + int r = JSCallerSavedCode(i); + Register reg = { r }; + if ((object_regs & (1 << r)) != 0) { + __ push(reg); + } + if ((non_object_regs & (1 << r)) != 0) { + if (FLAG_debug_code) { + __ test(reg, Immediate(0xc0000000)); + __ Assert(zero, "Unable to encode value as smi"); + } + __ SmiTag(reg); + __ push(reg); + } + } + +#ifdef DEBUG + __ RecordComment("// Calling from debug break to runtime - come in - over"); +#endif + __ Set(eax, Immediate(0)); // No arguments. + __ mov(ebx, Immediate(ExternalReference::debug_break(masm->isolate()))); + + CEntryStub ceb(1); + __ CallStub(&ceb); + + // Restore the register values containing object pointers from the expression + // stack. + for (int i = kNumJSCallerSaved; --i >= 0;) { + int r = JSCallerSavedCode(i); + Register reg = { r }; + if (FLAG_debug_code) { + __ Set(reg, Immediate(kDebugZapValue)); + } + if ((object_regs & (1 << r)) != 0) { + __ pop(reg); + } + if ((non_object_regs & (1 << r)) != 0) { + __ pop(reg); + __ SmiUntag(reg); + } + } + + // Get rid of the internal frame. + __ LeaveInternalFrame(); + + // If this call did not replace a call but patched other code then there will + // be an unwanted return address left on the stack. Here we get rid of that. + if (convert_call_to_jmp) { + __ add(Operand(esp), Immediate(kPointerSize)); + } + + // Now that the break point has been handled, resume normal execution by + // jumping to the target address intended by the caller and that was + // overwritten by the address of DebugBreakXXX. + ExternalReference after_break_target = + ExternalReference(Debug_Address::AfterBreakTarget(), masm->isolate()); + __ jmp(Operand::StaticVariable(after_break_target)); +} + + +void Debug::GenerateLoadICDebugBreak(MacroAssembler* masm) { + // Register state for IC load call (from ic-ia32.cc). + // ----------- S t a t e ------------- + // -- eax : receiver + // -- ecx : name + // ----------------------------------- + Generate_DebugBreakCallHelper(masm, eax.bit() | ecx.bit(), 0, false); +} + + +void Debug::GenerateStoreICDebugBreak(MacroAssembler* masm) { + // Register state for IC store call (from ic-ia32.cc). + // ----------- S t a t e ------------- + // -- eax : value + // -- ecx : name + // -- edx : receiver + // ----------------------------------- + Generate_DebugBreakCallHelper( + masm, eax.bit() | ecx.bit() | edx.bit(), 0, false); +} + + +void Debug::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) { + // Register state for keyed IC load call (from ic-ia32.cc). + // ----------- S t a t e ------------- + // -- edx : receiver + // -- eax : key + // ----------------------------------- + Generate_DebugBreakCallHelper(masm, eax.bit() | edx.bit(), 0, false); +} + + +void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) { + // Register state for keyed IC load call (from ic-ia32.cc). + // ----------- S t a t e ------------- + // -- eax : value + // -- ecx : key + // -- edx : receiver + // ----------------------------------- + Generate_DebugBreakCallHelper( + masm, eax.bit() | ecx.bit() | edx.bit(), 0, false); +} + + +void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) { + // Register state for keyed IC call call (from ic-ia32.cc) + // ----------- S t a t e ------------- + // -- ecx: name + // ----------------------------------- + Generate_DebugBreakCallHelper(masm, ecx.bit(), 0, false); +} + + +void Debug::GenerateConstructCallDebugBreak(MacroAssembler* masm) { + // Register state just before return from JS function (from codegen-ia32.cc). + // eax is the actual number of arguments not encoded as a smi see comment + // above IC call. + // ----------- S t a t e ------------- + // -- eax: number of arguments (not smi) + // -- edi: constructor function + // ----------------------------------- + // The number of arguments in eax is not smi encoded. + Generate_DebugBreakCallHelper(masm, edi.bit(), eax.bit(), false); +} + + +void Debug::GenerateReturnDebugBreak(MacroAssembler* masm) { + // Register state just before return from JS function (from codegen-ia32.cc). + // ----------- S t a t e ------------- + // -- eax: return value + // ----------------------------------- + Generate_DebugBreakCallHelper(masm, eax.bit(), 0, true); +} + + +void Debug::GenerateStubNoRegistersDebugBreak(MacroAssembler* masm) { + // Register state for stub CallFunction (from CallFunctionStub in ic-ia32.cc). + // ----------- S t a t e ------------- + // No registers used on entry. + // ----------------------------------- + Generate_DebugBreakCallHelper(masm, 0, 0, false); +} + + +void Debug::GenerateSlot(MacroAssembler* masm) { + // Generate enough nop's to make space for a call instruction. + Label check_codesize; + __ bind(&check_codesize); + __ RecordDebugBreakSlot(); + for (int i = 0; i < Assembler::kDebugBreakSlotLength; i++) { + __ nop(); + } + ASSERT_EQ(Assembler::kDebugBreakSlotLength, + masm->SizeOfCodeGeneratedSince(&check_codesize)); +} + + +void Debug::GenerateSlotDebugBreak(MacroAssembler* masm) { + // In the places where a debug break slot is inserted no registers can contain + // object pointers. + Generate_DebugBreakCallHelper(masm, 0, 0, true); +} + + +void Debug::GeneratePlainReturnLiveEdit(MacroAssembler* masm) { + masm->ret(0); +} + + +void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) { + ExternalReference restarter_frame_function_slot = + ExternalReference(Debug_Address::RestarterFrameFunctionPointer(), + masm->isolate()); + __ mov(Operand::StaticVariable(restarter_frame_function_slot), Immediate(0)); + + // We do not know our frame height, but set esp based on ebp. + __ lea(esp, Operand(ebp, -1 * kPointerSize)); + + __ pop(edi); // Function. + __ pop(ebp); + + // Load context from the function. + __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset)); + + // Get function code. + __ mov(edx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset)); + __ mov(edx, FieldOperand(edx, SharedFunctionInfo::kCodeOffset)); + __ lea(edx, FieldOperand(edx, Code::kHeaderSize)); + + // Re-run JSFunction, edi is function, esi is context. + __ jmp(Operand(edx)); +} + +const bool Debug::kFrameDropperSupported = true; + +#undef __ + +#endif // ENABLE_DEBUGGER_SUPPORT + +} } // namespace v8::internal + +#endif // V8_TARGET_ARCH_IA32 |