[ignition] Refactor array iterator to separate out access

src/interpreter/bytecode-array-accessor.h

Index: src/interpreter/bytecode-array-accessor.h
diff --git a/src/interpreter/bytecode-array-iterator.h b/src/interpreter/bytecode-array-accessor.h
similarity index 80%
copy from src/interpreter/bytecode-array-iterator.h
copy to src/interpreter/bytecode-array-accessor.h
index 03279cbd431dcad7ed403d8193472204fc9150f5..efe9e6605eefb90a4110b36bfbac426ae3927b3a 100644
--- a/src/interpreter/bytecode-array-iterator.h
+++ b/src/interpreter/bytecode-array-accessor.h
@@ -1,9 +1,9 @@
-// Copyright 2015 the V8 project authors. All rights reserved.
+// 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_ITERATOR_H_
-#define V8_INTERPRETER_BYTECODE_ARRAY_ITERATOR_H_
+#ifndef V8_INTERPRETER_BYTECODE_ARRAY_ACCESSOR_H_
+#define V8_INTERPRETER_BYTECODE_ARRAY_ACCESSOR_H_
 
 #include "src/globals.h"
 #include "src/handles.h"
@@ -16,12 +16,13 @@ namespace v8 {
 namespace internal {
 namespace interpreter {
 
-class V8_EXPORT_PRIVATE BytecodeArrayIterator {
+class V8_EXPORT_PRIVATE BytecodeArrayAccessor {
  public:
-  explicit BytecodeArrayIterator(Handle<BytecodeArray> bytecode_array);
+  BytecodeArrayAccessor(Handle<BytecodeArray> bytecode_array,
+                        int initial_offset);
+
+  void SetOffset(int offset);
 
-  void Advance();
-  bool done() const;
   Bytecode current_bytecode() const;
   int current_bytecode_size() const;
   int current_offset() const { return bytecode_offset_; }
@@ -48,6 +49,8 @@ class V8_EXPORT_PRIVATE BytecodeArrayIterator {
   int GetJumpTargetOffset() const;
 
  private:
+  bool OffsetInBounds() const;
+
   uint32_t GetUnsignedOperand(int operand_index,
                               OperandType operand_type) const;
   int32_t GetSignedOperand(int operand_index, OperandType operand_type) const;
@@ -59,11 +62,11 @@ class V8_EXPORT_PRIVATE BytecodeArrayIterator {
   OperandScale operand_scale_;
   int prefix_offset_;
 
-  DISALLOW_COPY_AND_ASSIGN(BytecodeArrayIterator);
+  DISALLOW_COPY_AND_ASSIGN(BytecodeArrayAccessor);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
-#endif  // V8_INTERPRETER_BYTECODE_GRAPH_ITERATOR_H_
+#endif  // V8_INTERPRETER_BYTECODE_GRAPH_ACCESSOR_H_