[Interpreter] Bytecode graph builder

src/interpreter/bytecode-array-iterator.h

+// Copyright 2015 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_ITERATOR_H_
+#define V8_INTERPRETER_BYTECODE_ARRAY_ITERATOR_H_
+
+#include "src/handles.h"
+#include "src/interpreter/bytecodes.h"
+#include "src/objects.h"
+
+namespace v8 {
+namespace internal {
+namespace interpreter {
+
+class BytecodeArrayIterator {
+ public:
+  explicit BytecodeArrayIterator(Handle<BytecodeArray> bytecode_array);
+  ~BytecodeArrayIterator();
+
+  void Next();
+  bool More() const;
+
+  int8_t GetSmi8Operand(int operand_index) const;
+  int GetIndexOperand(int operand_index) const;
+  Register GetRegisterOperand(int operand_index) const;
+  Handle<Object> GetConstantForIndexOperand(int operand_index) const;
+
+  const Handle<BytecodeArray>& bytecode_array() const {
+    return bytecode_array_;
+  }
+
+  Bytecode current_bytecode() const;
+
+ private:
+  uint8_t GetOperand(int operand_index, OperandType operand_type) const;
+
+  void MarkOperandsUnused();
+  void CheckOperandsUsed() const;
+  void MarkOperandUsed(int operand_index) const;
+
+  Handle<BytecodeArray> bytecode_array_;
+  int bytecode_offset_;
+#ifdef DEBUG
+  mutable int operands_used_;
+#endif  // DEBUG
+  DISALLOW_COPY_AND_ASSIGN(BytecodeArrayIterator);
+};
+
+}  // namespace interpreter
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_INTERPRETER_BYTECODE_GRAPH_ITERATOR_H_