1 // Copyright 2013 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "src/crankshaft/hydrogen-mark-deoptimize.h" 6 7 namespace v8 { 8 namespace internal { 9 10 void HMarkDeoptimizeOnUndefinedPhase::Run() { 11 const ZoneList<HPhi*>* phi_list = graph()->phi_list(); 12 for (int i = 0; i < phi_list->length(); i++) { 13 HPhi* phi = phi_list->at(i); 14 if (phi->CheckFlag(HValue::kAllowUndefinedAsNaN) && 15 !phi->CheckUsesForFlag(HValue::kAllowUndefinedAsNaN)) { 16 ProcessPhi(phi); 17 } 18 } 19 } 20 21 22 void HMarkDeoptimizeOnUndefinedPhase::ProcessPhi(HPhi* phi) { 23 DCHECK(phi->CheckFlag(HValue::kAllowUndefinedAsNaN)); 24 DCHECK(worklist_.is_empty()); 25 26 // Push the phi onto the worklist 27 phi->ClearFlag(HValue::kAllowUndefinedAsNaN); 28 worklist_.Add(phi, zone()); 29 30 // Process all phis that can reach this phi 31 while (!worklist_.is_empty()) { 32 phi = worklist_.RemoveLast(); 33 for (int i = phi->OperandCount() - 1; i >= 0; --i) { 34 HValue* input = phi->OperandAt(i); 35 if (input->IsPhi() && input->CheckFlag(HValue::kAllowUndefinedAsNaN)) { 36 input->ClearFlag(HValue::kAllowUndefinedAsNaN); 37 worklist_.Add(HPhi::cast(input), zone()); 38 } 39 } 40 } 41 } 42 43 44 void HComputeChangeUndefinedToNaN::Run() { 45 const ZoneList<HBasicBlock*>* blocks(graph()->blocks()); 46 for (int i = 0; i < blocks->length(); ++i) { 47 const HBasicBlock* block(blocks->at(i)); 48 for (HInstruction* current = block->first(); current != NULL; ) { 49 HInstruction* next = current->next(); 50 if (current->IsChange()) { 51 if (HChange::cast(current)->can_convert_undefined_to_nan()) { 52 current->SetFlag(HValue::kAllowUndefinedAsNaN); 53 } 54 } 55 current = next; 56 } 57 } 58 } 59 60 61 } // namespace internal 62 } // namespace v8 63
