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// 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 "src/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) {
DCHECK(phi->CheckFlag(HValue::kAllowUndefinedAsNaN));
DCHECK(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 internal
} // namespace v8
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