[Interpreter] Save and restore dispatch table pointer during calls.

src/frames.h

 // Copyright 2012 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_FRAMES_H_
 #define V8_FRAMES_H_
 
 #include "src/allocation.h"
 #include "src/handles.h"
 #include "src/safepoint-table.h"
@@ skipping 160 matching lines @@
 
   static const int kFrameSize =
       StandardFrameConstants::kFixedFrameSize + 4 * kPointerSize;
 };
 
 
 class InterpreterFrameConstants : public AllStatic {
  public:
   // Fixed frame includes new.target and bytecode offset.
   static const int kFixedFrameSize =
-      StandardFrameConstants::kFixedFrameSize + 2 * kPointerSize;
+      StandardFrameConstants::kFixedFrameSize + 3 * kPointerSize;
   static const int kFixedFrameSizeFromFp =
-      StandardFrameConstants::kFixedFrameSizeFromFp + 2 * kPointerSize;
+      StandardFrameConstants::kFixedFrameSizeFromFp + 3 * kPointerSize;
 
   // FP-relative.
   static const int kBytecodeOffsetFromFp =
-      -StandardFrameConstants::kFixedFrameSizeFromFp - 2 * kPointerSize;
+      -StandardFrameConstants::kFixedFrameSizeFromFp - 3 * kPointerSize;
   static const int kRegisterFilePointerFromFp =
-      -StandardFrameConstants::kFixedFrameSizeFromFp - 3 * kPointerSize;
+      -StandardFrameConstants::kFixedFrameSizeFromFp - 4 * kPointerSize;
 
   // Expression index for {StandardFrame::GetExpressionAddress}.
-  static const int kBytecodeOffsetExpressionIndex = 1;
-  static const int kRegisterFileExpressionIndex = 2;
+  static const int kBytecodeOffsetExpressionIndex = 2;
+  static const int kRegisterFileExpressionIndex = 3;
 
   // Register file pointer relative.
   static const int kLastParamFromRegisterPointer =
-      StandardFrameConstants::kFixedFrameSize + 3 * kPointerSize;
+      StandardFrameConstants::kFixedFrameSize + 4 * kPointerSize;
 
   static const int kBytecodeOffsetFromRegisterPointer = 1 * kPointerSize;
-  static const int kNewTargetFromRegisterPointer = 2 * kPointerSize;
-  static const int kFunctionFromRegisterPointer = 3 * kPointerSize;
-  static const int kContextFromRegisterPointer = 4 * kPointerSize;
+  static const int kDispatchTableFromRegisterPointer = 2 * kPointerSize;
+  static const int kNewTargetFromRegisterPointer = 3 * kPointerSize;
+  static const int kFunctionFromRegisterPointer = 4 * kPointerSize;
+  static const int kContextFromRegisterPointer = 5 * kPointerSize;

[Yang, 2016/02/10 12:37:46]

Can you introduce a convenience method to read and write to the dispatch table
to InterpretedFrame?

[rmcilroy, 2016/02/11 09:00:50]

Done.

 };
 
 
 // Abstract base class for all stack frames.
 class StackFrame BASE_EMBEDDED {
  public:
 #define DECLARE_TYPE(type, ignore) type,
   enum Type {
     NONE = 0,
     STACK_FRAME_TYPE_LIST(DECLARE_TYPE)
@@ skipping 779 matching lines @@
 
 
 // Reads all frames on the current stack and copies them into the current
 // zone memory.
 Vector<StackFrame*> CreateStackMap(Isolate* isolate, Zone* zone);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_FRAMES_H_