LiveEdit: implement frame dropping

src/frames.h

 // Copyright 2006-2008 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 96 matching lines @@
     NONE = 0,
     STACK_FRAME_TYPE_LIST(DECLARE_TYPE)
     NUMBER_OF_TYPES
   };
 #undef DECLARE_TYPE
 
   // Opaque data type for identifying stack frames. Used extensively
   // by the debugger.
   enum Id { NO_ID = 0 };
 
+  // Copy constructor; it breaks the connection to host iterator.
+  StackFrame(const StackFrame& original) {
+    this->state_ = original.state_;
+    this->iterator_ = NULL;
+  }
+
   // Type testers.
   bool is_entry() const { return type() == ENTRY; }
   bool is_entry_construct() const { return type() == ENTRY_CONSTRUCT; }
   bool is_exit() const { return type() == EXIT; }
   bool is_java_script() const { return type() == JAVA_SCRIPT; }
   bool is_arguments_adaptor() const { return type() == ARGUMENTS_ADAPTOR; }
   bool is_internal() const { return type() == INTERNAL; }
   bool is_construct() const { return type() == CONSTRUCT; }
   virtual bool is_standard() const { return false; }
 
   // Accessors.
   Address sp() const { return state_.sp; }
   Address fp() const { return state_.fp; }
   Address caller_sp() const { return GetCallerStackPointer(); }
 
   Address pc() const { return *pc_address(); }
   void set_pc(Address pc) { *pc_address() = pc; }
 
+  virtual void SetCallerFp(Address caller_fp) = 0;
+
   Address* pc_address() const { return state_.pc_address; }
 
   // Get the id of this stack frame.
   Id id() const { return static_cast<Id>(OffsetFrom(caller_sp())); }
 
   // Checks if this frame includes any stack handlers.
   bool HasHandler() const;
 
   // Get the type of this frame.
   virtual Type type() const = 0;
@@ skipping 48 matching lines @@
   virtual Type GetCallerState(State* state) const;
 
   // Cooking/uncooking support.
   void Cook();
   void Uncook();
 
   friend class StackFrameIterator;
   friend class StackHandlerIterator;
   friend class SafeStackFrameIterator;
 
-  DISALLOW_IMPLICIT_CONSTRUCTORS(StackFrame);
+ private:
+  void operator=(const StackFrame& original);
 };
 
 
 // Entry frames are used to enter JavaScript execution from C.
 class EntryFrame: public StackFrame {
  public:
   virtual Type type() const { return ENTRY; }
 
   virtual Code* code() const;
 
   // Garbage collection support.
   virtual void Iterate(ObjectVisitor* v) const;
 
   static EntryFrame* cast(StackFrame* frame) {
     ASSERT(frame->is_entry());
     return static_cast<EntryFrame*>(frame);
   }
+  virtual void SetCallerFp(Address caller_fp);
 
  protected:
   explicit EntryFrame(StackFrameIterator* iterator) : StackFrame(iterator) { }
 
   // The caller stack pointer for entry frames is always zero. The
   // real information about the caller frame is available through the
   // link to the top exit frame.
   virtual Address GetCallerStackPointer() const { return 0; }
 
  private:
@@ skipping 30 matching lines @@
   enum Mode { MODE_NORMAL, MODE_DEBUG };
   virtual Type type() const { return EXIT; }
 
   virtual Code* code() const;
 
   Object*& code_slot() const;
 
   // Garbage collection support.
   virtual void Iterate(ObjectVisitor* v) const;
 
+  virtual void SetCallerFp(Address caller_fp);
+
   static ExitFrame* cast(StackFrame* frame) {
     ASSERT(frame->is_exit());
     return static_cast<ExitFrame*>(frame);
   }
 
   // Compute the state and type of an exit frame given a frame
   // pointer. Used when constructing the first stack frame seen by an
   // iterator and the frames following entry frames.
   static Type GetStateForFramePointer(Address fp, State* state);
 
@@ skipping 15 matching lines @@
   virtual bool is_standard() const { return true; }
 
   // Accessors.
   inline Object* context() const;
 
   // Access the expressions in the stack frame including locals.
   inline Object* GetExpression(int index) const;
   inline void SetExpression(int index, Object* value);
   int ComputeExpressionsCount() const;
 
+  virtual void SetCallerFp(Address caller_fp);
+
   static StandardFrame* cast(StackFrame* frame) {
     ASSERT(frame->is_standard());
     return static_cast<StandardFrame*>(frame);
   }
 
  protected:
   explicit StandardFrame(StackFrameIterator* iterator)
       : StackFrame(iterator) { }
 
   virtual void ComputeCallerState(State* state) const;
@@ skipping 335 matching lines @@
  public:
   // Find the nth JavaScript frame on the stack. The caller must
   // guarantee that such a frame exists.
   JavaScriptFrame* FindJavaScriptFrame(int n);
 
  private:
   StackFrameIterator iterator_;
 };
 
 
+// Reads all frames on the current stack and copies them into the current
+// zone memory.
+Vector<StackFrame*> CreateStackMap();
+
 } }  // namespace v8::internal
 
 #endif  // V8_FRAMES_H_