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+// Copyright 2011 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_X64)
+
+#include "x64/lithium-gap-resolver-x64.h"
+#include "x64/lithium-codegen-x64.h"
+
+namespace v8 {
+namespace internal {
+
+LGapResolver::LGapResolver(LCodeGen* owner)
+ : cgen_(owner), moves_(32) {}
+
+
+void LGapResolver::Resolve(LParallelMove* parallel_move) {
+ ASSERT(moves_.is_empty());
+ // Build up a worklist of moves.
+ BuildInitialMoveList(parallel_move);
+
+ for (int i = 0; i < moves_.length(); ++i) {
+ LMoveOperands move = moves_[i];
+ // Skip constants to perform them last. They don't block other moves
+ // and skipping such moves with register destinations keeps those
+ // registers free for the whole algorithm.
+ if (!move.IsEliminated() && !move.source()->IsConstantOperand()) {
+ PerformMove(i);
+ }
+ }
+
+ // Perform the moves with constant sources.
+ for (int i = 0; i < moves_.length(); ++i) {
+ if (!moves_[i].IsEliminated()) {
+ ASSERT(moves_[i].source()->IsConstantOperand());
+ EmitMove(i);
+ }
+ }
+
+ moves_.Rewind(0);
+}
+
+
+void LGapResolver::BuildInitialMoveList(LParallelMove* parallel_move) {
+ // Perform a linear sweep of the moves to add them to the initial list of
+ // moves to perform, ignoring any move that is redundant (the source is
+ // the same as the destination, the destination is ignored and
+ // unallocated, or the move was already eliminated).
+ const ZoneList<LMoveOperands>* moves = parallel_move->move_operands();
+ for (int i = 0; i < moves->length(); ++i) {
+ LMoveOperands move = moves->at(i);
+ if (!move.IsRedundant()) moves_.Add(move);
+ }
+ Verify();
+}
+
+
+void LGapResolver::PerformMove(int index) {
+ // Each call to this function performs a move and deletes it from the move
+ // graph. We first recursively perform any move blocking this one. We
+ // mark a move as "pending" on entry to PerformMove in order to detect
+ // cycles in the move graph. We use operand swaps to resolve cycles,
+ // which means that a call to PerformMove could change any source operand
+ // in the move graph.
+
+ ASSERT(!moves_[index].IsPending());
+ ASSERT(!moves_[index].IsRedundant());
+
+ // Clear this move's destination to indicate a pending move. The actual
+ // destination is saved in a stack-allocated local. Recursion may allow
+ // multiple moves to be pending.
+ ASSERT(moves_[index].source() != NULL); // Or else it will look eliminated.
+ LOperand* destination = moves_[index].destination();
+ moves_[index].set_destination(NULL);
+
+ // Perform a depth-first traversal of the move graph to resolve
+ // dependencies. Any unperformed, unpending move with a source the same
+ // as this one's destination blocks this one so recursively perform all
+ // such moves.
+ for (int i = 0; i < moves_.length(); ++i) {
+ LMoveOperands other_move = moves_[i];
+ if (other_move.Blocks(destination) && !other_move.IsPending()) {
+ // Though PerformMove can change any source operand in the move graph,
+ // this call cannot create a blocking move via a swap (this loop does
+ // not miss any). Assume there is a non-blocking move with source A
+ // and this move is blocked on source B and there is a swap of A and
+ // B. Then A and B must be involved in the same cycle (or they would
+ // not be swapped). Since this move's destination is B and there is
+ // only a single incoming edge to an operand, this move must also be
+ // involved in the same cycle. In that case, the blocking move will
+ // be created but will be "pending" when we return from PerformMove.
+ PerformMove(i);
+ }
+ }
+
+ // We are about to resolve this move and don't need it marked as
+ // pending, so restore its destination.
+ moves_[index].set_destination(destination);
+
+ // This move's source may have changed due to swaps to resolve cycles and
+ // so it may now be the last move in the cycle. If so remove it.
+ if (moves_[index].source()->Equals(destination)) {
+ moves_[index].Eliminate();
+ return;
+ }
+
+ // The move may be blocked on a (at most one) pending move, in which case
+ // we have a cycle. Search for such a blocking move and perform a swap to
+ // resolve it.
+ for (int i = 0; i < moves_.length(); ++i) {
+ LMoveOperands other_move = moves_[i];
+ if (other_move.Blocks(destination)) {
+ ASSERT(other_move.IsPending());
+ EmitSwap(index);
+ return;
+ }
+ }
+
+ // This move is not blocked.
+ EmitMove(index);
+}
+
+
+void LGapResolver::Verify() {
+#ifdef ENABLE_SLOW_ASSERTS
+ // No operand should be the destination for more than one move.
+ for (int i = 0; i < moves_.length(); ++i) {
+ LOperand* destination = moves_[i].destination();
+ for (int j = i + 1; j < moves_.length(); ++j) {
+ SLOW_ASSERT(!destination->Equals(moves_[j].destination()));
+ }
+ }
+#endif
+}
+
+
+#define __ ACCESS_MASM(cgen_->masm())
+
+
+void LGapResolver::EmitMove(int index) {
+ LOperand* source = moves_[index].source();
+ LOperand* destination = moves_[index].destination();
+
+ // Dispatch on the source and destination operand kinds. Not all
+ // combinations are possible.
+ if (source->IsRegister()) {
+ Register src = cgen_->ToRegister(source);
+ if (destination->IsRegister()) {
+ Register dst = cgen_->ToRegister(destination);
+ __ movq(dst, src);
+ } else {
+ ASSERT(destination->IsStackSlot());
+ Operand dst = cgen_->ToOperand(destination);
+ __ movq(dst, src);
+ }
+
+ } else if (source->IsStackSlot()) {
+ Operand src = cgen_->ToOperand(source);
+ if (destination->IsRegister()) {
+ Register dst = cgen_->ToRegister(destination);
+ __ movq(dst, src);
+ } else {
+ ASSERT(destination->IsStackSlot());
+ Operand dst = cgen_->ToOperand(destination);
+ __ movq(kScratchRegister, src);
+ __ movq(dst, kScratchRegister);
+ }
+
+ } else if (source->IsConstantOperand()) {
+ LConstantOperand* constant_source = LConstantOperand::cast(source);
+ if (destination->IsRegister()) {
+ Register dst = cgen_->ToRegister(destination);
+ if (cgen_->IsInteger32Constant(constant_source)) {
+ __ movl(dst, Immediate(cgen_->ToInteger32(constant_source)));
+ } else {
+ __ Move(dst, cgen_->ToHandle(constant_source));
+ }
+ } else {
+ ASSERT(destination->IsStackSlot());
+ Operand dst = cgen_->ToOperand(destination);
+ if (cgen_->IsInteger32Constant(constant_source)) {
+ // Allow top 32 bits of an untagged Integer32 to be arbitrary.
+ __ movl(dst, Immediate(cgen_->ToInteger32(constant_source)));
+ } else {
+ __ Move(dst, cgen_->ToHandle(constant_source));
+ }
+ }
+
+ } else if (source->IsDoubleRegister()) {
+ XMMRegister src = cgen_->ToDoubleRegister(source);
+ if (destination->IsDoubleRegister()) {
+ __ movsd(cgen_->ToDoubleRegister(destination), src);
+ } else {
+ ASSERT(destination->IsDoubleStackSlot());
+ __ movsd(cgen_->ToOperand(destination), src);
+ }
+ } else if (source->IsDoubleStackSlot()) {
+ Operand src = cgen_->ToOperand(source);
+ if (destination->IsDoubleRegister()) {
+ __ movsd(cgen_->ToDoubleRegister(destination), src);
+ } else {
+ ASSERT(destination->IsDoubleStackSlot());
+ __ movsd(xmm0, src);
+ __ movsd(cgen_->ToOperand(destination), xmm0);
+ }
+ } else {
+ UNREACHABLE();
+ }
+
+ moves_[index].Eliminate();
+}
+
+
+void LGapResolver::EmitSwap(int index) {
+ LOperand* source = moves_[index].source();
+ LOperand* destination = moves_[index].destination();
+
+ // Dispatch on the source and destination operand kinds. Not all
+ // combinations are possible.
+ if (source->IsRegister() && destination->IsRegister()) {
+ // Swap two general-purpose registers.
+ Register src = cgen_->ToRegister(source);
+ Register dst = cgen_->ToRegister(destination);
+ __ xchg(dst, src);
+
+ } else if ((source->IsRegister() && destination->IsStackSlot()) ||
+ (source->IsStackSlot() && destination->IsRegister())) {
+ // Swap a general-purpose register and a stack slot.
+ Register reg =
+ cgen_->ToRegister(source->IsRegister() ? source : destination);
+ Operand mem =
+ cgen_->ToOperand(source->IsRegister() ? destination : source);
+ __ movq(kScratchRegister, mem);
+ __ movq(mem, reg);
+ __ movq(reg, kScratchRegister);
+
+ } else if ((source->IsStackSlot() && destination->IsStackSlot()) ||
+ (source->IsDoubleStackSlot() && destination->IsDoubleStackSlot())) {
+ // Swap two stack slots or two double stack slots.
+ Operand src = cgen_->ToOperand(source);
+ Operand dst = cgen_->ToOperand(destination);
+ __ movsd(xmm0, src);
+ __ movq(kScratchRegister, dst);
+ __ movsd(dst, xmm0);
+ __ movq(src, kScratchRegister);
+
+ } else if (source->IsDoubleRegister() && destination->IsDoubleRegister()) {
+ // Swap two double registers.
+ XMMRegister source_reg = cgen_->ToDoubleRegister(source);
+ XMMRegister destination_reg = cgen_->ToDoubleRegister(destination);
+ __ movsd(xmm0, source_reg);
+ __ movsd(source_reg, destination_reg);
+ __ movsd(destination_reg, xmm0);
+
+ } else if (source->IsDoubleRegister() || destination->IsDoubleRegister()) {
+ // Swap a double register and a double stack slot.
+ ASSERT((source->IsDoubleRegister() && destination->IsDoubleStackSlot()) ||
+ (source->IsDoubleStackSlot() && destination->IsDoubleRegister()));
+ XMMRegister reg = cgen_->ToDoubleRegister(source->IsDoubleRegister()
+ ? source
+ : destination);
+ LOperand* other = source->IsDoubleRegister() ? destination : source;
+ ASSERT(other->IsDoubleStackSlot());
+ Operand other_operand = cgen_->ToOperand(other);
+ __ movsd(xmm0, other_operand);
+ __ movsd(other_operand, reg);
+ __ movsd(reg, xmm0);
+
+ } else {
+ // No other combinations are possible.
+ UNREACHABLE();
+ }
+
+ // The swap of source and destination has executed a move from source to
+ // destination.
+ moves_[index].Eliminate();
+
+ // Any unperformed (including pending) move with a source of either
+ // this move's source or destination needs to have their source
+ // changed to reflect the state of affairs after the swap.
+ for (int i = 0; i < moves_.length(); ++i) {
+ LMoveOperands other_move = moves_[i];
+ if (other_move.Blocks(source)) {
+ moves_[i].set_source(destination);
+ } else if (other_move.Blocks(destination)) {
+ moves_[i].set_source(source);
+ }
+ }
+}
+
+#undef __
+
+} } // namespace v8::internal
+
+#endif // V8_TARGET_ARCH_X64
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