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// Copyright 2016 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. #ifndef V8_INTERPRETER_BYTECODE_ARRAY_RANDOM_ITERATOR_H_ #define V8_INTERPRETER_BYTECODE_ARRAY_RANDOM_ITERATOR_H_ #include <memory> #include "src/interpreter/bytecode-array-iterator.h" #include "src/zone/zone-containers.h" #include "src/zone/zone.h" namespace v8 { namespace internal { namespace interpreter { class V8_EXPORT_PRIVATE BytecodeArrayRandomIterator final : public BytecodeArrayIterator { public: BytecodeArrayRandomIterator(Handle<BytecodeArray> bytecode_array, Zone* zone); BytecodeArrayRandomIterator(const BytecodeArrayRandomIterator&) = delete; BytecodeArrayRandomIterator& operator=(const BytecodeArrayRandomIterator&) = delete; BytecodeArrayRandomIterator& operator++() { ++current_index_; UpdateOffsetFromIndex(); return *this; } BytecodeArrayRandomIterator& operator--() { --current_index_; UpdateOffsetFromIndex(); return *this; } BytecodeArrayRandomIterator& operator+=(int offset) { current_index_ += offset; UpdateOffsetFromIndex(); return *this; } BytecodeArrayRandomIterator& operator-=(int offset) { current_index_ -= offset; UpdateOffsetFromIndex(); return *this; } int current_index() const { return current_index_; } size_t size() const { return offsets_.size(); } void GoToIndex(int index) { current_index_ = index; UpdateOffsetFromIndex(); } void GoToStart() { current_index_ = 0; UpdateOffsetFromIndex(); } void GoToEnd() { DCHECK_LT(offsets_.size() - 1, static_cast<size_t>(INT_MAX)); current_index_ = static_cast<int>(offsets_.size() - 1); UpdateOffsetFromIndex(); } bool IsValid() const; private: ZoneVector<int> offsets_; int current_index_; void Initialize(); void UpdateOffsetFromIndex(); }; } // namespace interpreter } // namespace internal } // namespace v8 #endif // V8_INTERPRETER_BYTECODE_ARRAY_RANDOM_ITERATOR_H_