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

src/frames.h

Index: src/frames.h
diff --git a/src/frames.h b/src/frames.h
index 48e5a3e1490ec826cbb4747ab2bd95b4f5ddb603..3df4abffd8e6c4ee635d34be675a0b74c003ea43 100644
--- a/src/frames.h
+++ b/src/frames.h
@@ -178,28 +178,29 @@ 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;
-  static const int kRegisterFilePointerFromFp =
       -StandardFrameConstants::kFixedFrameSizeFromFp - 3 * kPointerSize;
+  static const int kRegisterFilePointerFromFp =
+      -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.

 };