b9d930735a
This allows us to optimise the bytecode liveness analysis to jump directly to previously seen indices. The analysis is optimised to store a stack of loop ends (JumpLoop bytecode indices), and iterate through these indices directly rather than looping through the bytecode array to find them. Review-Url: https://codereview.chromium.org/2536653003 Cr-Commit-Position: refs/heads/master@{#41485}
79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
// Copyright 2016 the V8 project authors. All rights reserved.
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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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#ifndef V8_INTERPRETER_BYTECODE_ARRAY_RANDOM_ITERATOR_H_
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#define V8_INTERPRETER_BYTECODE_ARRAY_RANDOM_ITERATOR_H_
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#include "src/interpreter/bytecode-array-accessor.h"
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#include "src/zone/zone-containers.h"
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#include "src/zone/zone.h"
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namespace v8 {
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namespace internal {
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namespace interpreter {
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class V8_EXPORT_PRIVATE BytecodeArrayRandomIterator final
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: public BytecodeArrayAccessor {
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public:
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explicit BytecodeArrayRandomIterator(Handle<BytecodeArray> bytecode_array,
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Zone* zone);
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BytecodeArrayRandomIterator& operator++() {
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++current_index_;
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UpdateOffsetFromIndex();
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return *this;
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}
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BytecodeArrayRandomIterator& operator--() {
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--current_index_;
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UpdateOffsetFromIndex();
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return *this;
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}
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BytecodeArrayRandomIterator& operator+=(int offset) {
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current_index_ += offset;
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UpdateOffsetFromIndex();
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return *this;
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}
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BytecodeArrayRandomIterator& operator-=(int offset) {
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current_index_ -= offset;
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UpdateOffsetFromIndex();
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return *this;
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}
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int current_index() const { return current_index_; }
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size_t size() const { return offsets_.size(); }
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void GoToIndex(int index) {
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current_index_ = index;
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UpdateOffsetFromIndex();
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}
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void GoToStart() {
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current_index_ = 0;
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UpdateOffsetFromIndex();
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}
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void GoToEnd() {
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DCHECK_LT(offsets_.size() - 1, static_cast<size_t>(INT_MAX));
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current_index_ = static_cast<int>(offsets_.size() - 1);
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UpdateOffsetFromIndex();
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}
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bool IsValid() const;
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private:
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ZoneVector<int> offsets_;
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int current_index_;
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void UpdateOffsetFromIndex();
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DISALLOW_COPY_AND_ASSIGN(BytecodeArrayRandomIterator);
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};
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} // namespace interpreter
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} // namespace internal
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} // namespace v8
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#endif // V8_INTERPRETER_BYTECODE_ARRAY_RANDOM_ITERATOR_H_
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