| // Copyright 2013 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 |
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| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #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)) { |
| for (HUseIterator it(phi->uses()); !it.Done(); it.Advance()) { |
| HValue* use_value = it.value(); |
| if (!use_value->CheckFlag(HValue::kAllowUndefinedAsNaN)) { |
| ProcessPhi(phi); |
| break; |
| } |
| } |
| } |
| } |
| } |
| |
| |
| 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()); |
| } |
| } |
| } |
| } |
| |
| } } // namespace v8::internal |