[interpreter] Change interpreter to use an BytecodeArray pointer and and offset.

src/compiler/interpreter-assembler.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_COMPILER_INTERPRETER_CODEGEN_H_
 #define V8_COMPILER_INTERPRETER_CODEGEN_H_
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
 // Do not include anything from src/compiler here!
 #include "src/allocation.h"
@@ skipping 50 matching lines @@
   static const int kMaxRegisterIndex = 255;
 
   // Close the graph.
   void End();
 
   // Protected helpers (for testing) which delegate to RawMachineAssembler.
   CallDescriptor* call_descriptor() const;
   Graph* graph();
 
  private:
-  // Returns the pointer to the current bytecode.
-  Node* BytecodePointer();
-  // Returns the pointer to first entry in the interpreter dispatch table.
+  // Returns a tagged pointer to the current function's BytecodeArray object.
+  Node* BytecodeArrayPointer();
+  // Returns the offset from the BytecodeArrayPointer of the current bytecode.
+  Node* BytecodeOffset();
+  // Returns a pointer to first entry in the interpreter dispatch table.
   Node* DispatchTablePointer();
   // Returns the frame pointer for the current function.
   Node* FramePointer();
 
   // Returns the offset of register |index|.
   Node* RegisterFrameOffset(int index);
   Node* RegisterFrameOffset(Node* index);
 
-  // Returns BytecodePointer() advanced by delta bytecodes. Note: this does not
-  // update BytecodePointer() itself.
+  // Returns BytecodeOffset() advanced by delta bytecodes. Note: this does not
+  // update BytecodeOffset() itself.
   Node* Advance(int delta);
 
   // Sets the end node of the graph.
   void SetEndInput(Node* input);
 
   // Private helpers which delegate to RawMachineAssembler.
   Isolate* isolate();
   Schedule* schedule();
   MachineOperatorBuilder* machine();
   CommonOperatorBuilder* common();
 
   interpreter::Bytecode bytecode_;
   base::SmartPointer<RawMachineAssembler> raw_assembler_;
   Node* end_node_;
   bool code_generated_;
 
   DISALLOW_COPY_AND_ASSIGN(InterpreterAssembler);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INTERPRETER_CODEGEN_H_