| // Copyright 2013 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "hydrogen-mark-deoptimize.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| void HMarkDeoptimizeOnUndefinedPhase::Run() { |
| const ZoneList<HPhi*>* phi_list = graph()->phi_list(); |
| for (int i = 0; i < phi_list->length(); i++) { |
| HPhi* phi = phi_list->at(i); |
| if (phi->CheckFlag(HValue::kAllowUndefinedAsNaN) && |
| !phi->CheckUsesForFlag(HValue::kAllowUndefinedAsNaN)) { |
| ProcessPhi(phi); |
| } |
| } |
| } |
| |
| |
| void HMarkDeoptimizeOnUndefinedPhase::ProcessPhi(HPhi* phi) { |
| ASSERT(phi->CheckFlag(HValue::kAllowUndefinedAsNaN)); |
| ASSERT(worklist_.is_empty()); |
| |
| // Push the phi onto the worklist |
| phi->ClearFlag(HValue::kAllowUndefinedAsNaN); |
| worklist_.Add(phi, zone()); |
| |
| // Process all phis that can reach this phi |
| while (!worklist_.is_empty()) { |
| phi = worklist_.RemoveLast(); |
| for (int i = phi->OperandCount() - 1; i >= 0; --i) { |
| HValue* input = phi->OperandAt(i); |
| if (input->IsPhi() && input->CheckFlag(HValue::kAllowUndefinedAsNaN)) { |
| input->ClearFlag(HValue::kAllowUndefinedAsNaN); |
| worklist_.Add(HPhi::cast(input), zone()); |
| } |
| } |
| } |
| } |
| |
| |
| void HComputeChangeUndefinedToNaN::Run() { |
| const ZoneList<HBasicBlock*>* blocks(graph()->blocks()); |
| for (int i = 0; i < blocks->length(); ++i) { |
| const HBasicBlock* block(blocks->at(i)); |
| for (HInstruction* current = block->first(); current != NULL; ) { |
| HInstruction* next = current->next(); |
| if (current->IsChange()) { |
| if (HChange::cast(current)->can_convert_undefined_to_nan()) { |
| current->SetFlag(HValue::kAllowUndefinedAsNaN); |
| } |
| } |
| current = next; |
| } |
| } |
| } |
| |
| |
| } } // namespace v8::internal |