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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-accessor.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 BytecodeArrayAccessor {
public:
BytecodeArrayRandomIterator(
std::unique_ptr<AbstractBytecodeArray> bytecode_array, Zone* zone);
BytecodeArrayRandomIterator(Handle<BytecodeArray> bytecode_array, Zone* zone);
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();
DISALLOW_COPY_AND_ASSIGN(BytecodeArrayRandomIterator);
};
} // namespace interpreter
} // namespace internal
} // namespace v8
#endif // V8_INTERPRETER_BYTECODE_ARRAY_RANDOM_ITERATOR_H_
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