1 // Copyright 2013 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 #include "hydrogen-mark-deoptimize.h" 29 30 namespace v8 { 31 namespace internal { 32 33 void HMarkDeoptimizeOnUndefinedPhase::Run() { 34 const ZoneList<HPhi*>* phi_list = graph()->phi_list(); 35 for (int i = 0; i < phi_list->length(); i++) { 36 HPhi* phi = phi_list->at(i); 37 if (phi->CheckFlag(HValue::kAllowUndefinedAsNaN) && 38 !phi->CheckUsesForFlag(HValue::kAllowUndefinedAsNaN)) { 39 ProcessPhi(phi); 40 } 41 } 42 } 43 44 45 void HMarkDeoptimizeOnUndefinedPhase::ProcessPhi(HPhi* phi) { 46 ASSERT(phi->CheckFlag(HValue::kAllowUndefinedAsNaN)); 47 ASSERT(worklist_.is_empty()); 48 49 // Push the phi onto the worklist 50 phi->ClearFlag(HValue::kAllowUndefinedAsNaN); 51 worklist_.Add(phi, zone()); 52 53 // Process all phis that can reach this phi 54 while (!worklist_.is_empty()) { 55 phi = worklist_.RemoveLast(); 56 for (int i = phi->OperandCount() - 1; i >= 0; --i) { 57 HValue* input = phi->OperandAt(i); 58 if (input->IsPhi() && input->CheckFlag(HValue::kAllowUndefinedAsNaN)) { 59 input->ClearFlag(HValue::kAllowUndefinedAsNaN); 60 worklist_.Add(HPhi::cast(input), zone()); 61 } 62 } 63 } 64 } 65 66 67 void HComputeChangeUndefinedToNaN::Run() { 68 const ZoneList<HBasicBlock*>* blocks(graph()->blocks()); 69 for (int i = 0; i < blocks->length(); ++i) { 70 const HBasicBlock* block(blocks->at(i)); 71 for (HInstruction* current = block->first(); current != NULL; ) { 72 HInstruction* next = current->next(); 73 if (current->IsChange()) { 74 if (HChange::cast(current)->can_convert_undefined_to_nan()) { 75 current->SetFlag(HValue::kAllowUndefinedAsNaN); 76 } 77 } 78 current = next; 79 } 80 } 81 } 82 83 84 } } // namespace v8::internal 85
