2013-07-30 10:25:20 +00:00
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// Copyright 2013 the V8 project authors. All rights reserved.
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2014-04-29 06:42:26 +00:00
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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2013-07-30 10:25:20 +00:00
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2014-06-03 08:12:43 +00:00
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#include "src/hydrogen-mark-deoptimize.h"
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2013-07-30 10:25:20 +00:00
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namespace v8 {
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namespace internal {
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void HMarkDeoptimizeOnUndefinedPhase::Run() {
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const ZoneList<HPhi*>* phi_list = graph()->phi_list();
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for (int i = 0; i < phi_list->length(); i++) {
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HPhi* phi = phi_list->at(i);
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2013-08-14 08:54:27 +00:00
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if (phi->CheckFlag(HValue::kAllowUndefinedAsNaN) &&
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!phi->CheckUsesForFlag(HValue::kAllowUndefinedAsNaN)) {
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ProcessPhi(phi);
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2013-07-30 10:25:20 +00:00
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}
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}
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}
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void HMarkDeoptimizeOnUndefinedPhase::ProcessPhi(HPhi* phi) {
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2014-08-04 11:34:54 +00:00
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DCHECK(phi->CheckFlag(HValue::kAllowUndefinedAsNaN));
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DCHECK(worklist_.is_empty());
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2013-07-30 10:25:20 +00:00
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// Push the phi onto the worklist
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phi->ClearFlag(HValue::kAllowUndefinedAsNaN);
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worklist_.Add(phi, zone());
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// Process all phis that can reach this phi
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while (!worklist_.is_empty()) {
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phi = worklist_.RemoveLast();
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for (int i = phi->OperandCount() - 1; i >= 0; --i) {
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HValue* input = phi->OperandAt(i);
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if (input->IsPhi() && input->CheckFlag(HValue::kAllowUndefinedAsNaN)) {
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input->ClearFlag(HValue::kAllowUndefinedAsNaN);
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worklist_.Add(HPhi::cast(input), zone());
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}
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}
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}
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}
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2013-08-14 08:54:27 +00:00
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void HComputeChangeUndefinedToNaN::Run() {
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const ZoneList<HBasicBlock*>* blocks(graph()->blocks());
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for (int i = 0; i < blocks->length(); ++i) {
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const HBasicBlock* block(blocks->at(i));
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for (HInstruction* current = block->first(); current != NULL; ) {
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HInstruction* next = current->next();
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if (current->IsChange()) {
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if (HChange::cast(current)->can_convert_undefined_to_nan()) {
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current->SetFlag(HValue::kAllowUndefinedAsNaN);
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}
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}
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current = next;
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}
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}
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}
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2013-07-30 10:25:20 +00:00
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} } // namespace v8::internal
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