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      1 // Copyright 2016 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef V8_INTERPRETER_BYTECODE_ARRAY_RANDOM_ITERATOR_H_
      6 #define V8_INTERPRETER_BYTECODE_ARRAY_RANDOM_ITERATOR_H_
      7 
      8 #include "src/interpreter/bytecode-array-accessor.h"
      9 #include "src/zone/zone-containers.h"
     10 #include "src/zone/zone.h"
     11 
     12 namespace v8 {
     13 namespace internal {
     14 namespace interpreter {
     15 
     16 class V8_EXPORT_PRIVATE BytecodeArrayRandomIterator final
     17     : public BytecodeArrayAccessor {
     18  public:
     19   explicit BytecodeArrayRandomIterator(Handle<BytecodeArray> bytecode_array,
     20                                        Zone* zone);
     21 
     22   BytecodeArrayRandomIterator& operator++() {
     23     ++current_index_;
     24     UpdateOffsetFromIndex();
     25     return *this;
     26   }
     27   BytecodeArrayRandomIterator& operator--() {
     28     --current_index_;
     29     UpdateOffsetFromIndex();
     30     return *this;
     31   }
     32 
     33   BytecodeArrayRandomIterator& operator+=(int offset) {
     34     current_index_ += offset;
     35     UpdateOffsetFromIndex();
     36     return *this;
     37   }
     38 
     39   BytecodeArrayRandomIterator& operator-=(int offset) {
     40     current_index_ -= offset;
     41     UpdateOffsetFromIndex();
     42     return *this;
     43   }
     44 
     45   int current_index() const { return current_index_; }
     46 
     47   size_t size() const { return offsets_.size(); }
     48 
     49   void GoToIndex(int index) {
     50     current_index_ = index;
     51     UpdateOffsetFromIndex();
     52   }
     53   void GoToStart() {
     54     current_index_ = 0;
     55     UpdateOffsetFromIndex();
     56   }
     57   void GoToEnd() {
     58     DCHECK_LT(offsets_.size() - 1, static_cast<size_t>(INT_MAX));
     59     current_index_ = static_cast<int>(offsets_.size() - 1);
     60     UpdateOffsetFromIndex();
     61   }
     62 
     63   bool IsValid() const;
     64 
     65  private:
     66   ZoneVector<int> offsets_;
     67   int current_index_;
     68 
     69   void UpdateOffsetFromIndex();
     70 
     71   DISALLOW_COPY_AND_ASSIGN(BytecodeArrayRandomIterator);
     72 };
     73 
     74 }  // namespace interpreter
     75 }  // namespace internal
     76 }  // namespace v8
     77 
     78 #endif  // V8_INTERPRETER_BYTECODE_ARRAY_RANDOM_ITERATOR_H_
     79