[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 kNewTargetFromFp =
+      -StandardFrameConstants::kFixedFrameSizeFromFp - 1 * kPointerSize;
+  static const int kDispatchTableFromFp =
+      -StandardFrameConstants::kFixedFrameSizeFromFp - 2 * kPointerSize;
   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;
 };
 
 
 // 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 503 matching lines @@
   friend class StackFrameIteratorBase;
 
   Object* StackSlotAt(int index) const;
 };
 
 
 class InterpretedFrame : public JavaScriptFrame {
  public:
   Type type() const override { return INTERPRETED; }
 
+  // GC support.
+  void Iterate(ObjectVisitor* v) const override;
+
   // Lookup exception handler for current {pc}, returns -1 if none found.
   int LookupExceptionHandlerInTable(
       int* data, HandlerTable::CatchPrediction* prediction) override;
 
   // Returns the current offset into the bytecode stream.
   int GetBytecodeOffset() const;
 
   // Updates the current offset into the bytecode stream, mainly used for stack
   // unwinding to continue execution at a different bytecode offset.
   void PatchBytecodeOffset(int new_offset);
 
+  // Returns the current dispatch table pointer.
+  Address GetDispatchTable() const;
+
+  // Updates the current dispatch table pointer with |dispatch_table|. Used by
+  // the debugger to swap execution onto the debugger dispatch table.
+  void PatchDispatchTable(Address dispatch_table);
+
   // Access to the interpreter register file for this frame.
   Object* GetInterpreterRegister(int register_index) const;
 
   // Build a list with summaries for this frame including all inlined frames.
   void Summarize(List<FrameSummary>* frames) override;
 
  protected:
   inline explicit InterpretedFrame(StackFrameIteratorBase* iterator);
 
  private:
@@ skipping 245 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_