Generators save and restore stack handlers

src/frames.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 75 matching lines @@
 
 class StackHandlerConstants : public AllStatic {
  public:
   static const int kNextOffset     = 0 * kPointerSize;
   static const int kCodeOffset     = 1 * kPointerSize;
   static const int kStateOffset    = 2 * kPointerSize;
   static const int kContextOffset  = 3 * kPointerSize;
   static const int kFPOffset       = 4 * kPointerSize;
 
   static const int kSize = kFPOffset + kPointerSize;
+  static const int kSlotCount = kSize >> kPointerSizeLog2;
 };
 
 
 class StackHandler BASE_EMBEDDED {
  public:
   enum Kind {
     JS_ENTRY,
     CATCH,
     FINALLY,
     LAST_KIND = FINALLY
@@ skipping 18 matching lines @@
   inline void Iterate(ObjectVisitor* v, Code* holder) const;
 
   // Conversion support.
   static inline StackHandler* FromAddress(Address address);
 
   // Testers
   inline bool is_js_entry() const;
   inline bool is_catch() const;
   inline bool is_finally() const;
 
+  // Generator support to preserve stack handlers.
+  void Unwind(Isolate* isolate, FixedArray* array, int offset,
+              int previous_handler_offset) const;
+  int Rewind(Isolate* isolate, FixedArray* array, int offset, Address fp);
+
  private:
   // Accessors.
   inline Kind kind() const;
+  inline unsigned index() const;
 
   inline Object** context_address() const;
   inline Object** code_address() const;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(StackHandler);
 };
 
 
 #define STACK_FRAME_TYPE_LIST(V)                         \
   V(ENTRY,                   EntryFrame)                 \
@@ skipping 387 matching lines @@
   inline Object* GetParameter(int index) const;
   inline int ComputeParametersCount() const {
     return GetNumberOfIncomingArguments();
   }
 
   // Access the operand stack.
   inline Address GetOperandSlot(int index) const;
   inline Object* GetOperand(int index) const;
   inline int ComputeOperandsCount() const;
 
+  // Generator support to preserve operand stack and stack handlers.
+  void SaveOperandStack(FixedArray* store, int* stack_handler_index) const;
+  void RestoreOperandStack(FixedArray* store, int stack_handler_index);
+
   // Debugger access.
   void SetParameterValue(int index, Object* value) const;
 
   // Check if this frame is a constructor frame invoked through 'new'.
   bool IsConstructor() const;
 
   // Check if this frame has "adapted" arguments in the sense that the
   // actual passed arguments are available in an arguments adaptor
   // frame below it on the stack.
   inline bool has_adapted_arguments() const;
@@ skipping 435 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 v8::internal
 
 #endif  // V8_FRAMES_H_