LiveEdit: implement frame dropping

src/frames.cc

 // 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 364 matching lines @@
 Code* EntryFrame::code() const {
   return Heap::js_entry_code();
 }
 
 
 void EntryFrame::ComputeCallerState(State* state) const {
   GetCallerState(state);
 }
 
 
+void EntryFrame::SetCallerFp(Address caller_fp) {
+  const int offset = EntryFrameConstants::kCallerFPOffset;
+  Memory::Address_at(this->fp() + offset) = caller_fp;
+}
+
+
 StackFrame::Type EntryFrame::GetCallerState(State* state) const {
   const int offset = EntryFrameConstants::kCallerFPOffset;
   Address fp = Memory::Address_at(this->fp() + offset);
   return ExitFrame::GetStateForFramePointer(fp, state);
 }
 
 
 Code* EntryConstructFrame::code() const {
   return Heap::js_construct_entry_code();
 }
@@ skipping 12 matching lines @@
 
 void ExitFrame::ComputeCallerState(State* state) const {
   // Setup the caller state.
   state->sp = caller_sp();
   state->fp = Memory::Address_at(fp() + ExitFrameConstants::kCallerFPOffset);
   state->pc_address
       = reinterpret_cast<Address*>(fp() + ExitFrameConstants::kCallerPCOffset);
 }
 
 
+void ExitFrame::SetCallerFp(Address caller_fp) {
+  Memory::Address_at(fp() + ExitFrameConstants::kCallerFPOffset) = caller_fp;
+}
+
+
 Address ExitFrame::GetCallerStackPointer() const {
   return fp() + ExitFrameConstants::kCallerSPDisplacement;
 }
 
 
 Address StandardFrame::GetExpressionAddress(int n) const {
   const int offset = StandardFrameConstants::kExpressionsOffset;
   return fp() + offset - n * kPointerSize;
 }
 
 
 int StandardFrame::ComputeExpressionsCount() const {
   const int offset =
       StandardFrameConstants::kExpressionsOffset + kPointerSize;
   Address base = fp() + offset;
   Address limit = sp();
   ASSERT(base >= limit);  // stack grows downwards
   // Include register-allocated locals in number of expressions.
   return static_cast<int>((base - limit) / kPointerSize);
 }
 
 
 void StandardFrame::ComputeCallerState(State* state) const {
   state->sp = caller_sp();
   state->fp = caller_fp();
   state->pc_address = reinterpret_cast<Address*>(ComputePCAddress(fp()));
 }
 
 
+void StandardFrame::SetCallerFp(Address caller_fp) {
+  Memory::Address_at(fp() + StandardFrameConstants::kCallerFPOffset) =
+      caller_fp;
+}
+
+
 bool StandardFrame::IsExpressionInsideHandler(int n) const {
   Address address = GetExpressionAddress(n);
   for (StackHandlerIterator it(this, top_handler()); !it.done(); it.Advance()) {
     if (it.handler()->includes(address)) return true;
   }
   return false;
 }
 
 
 Object* JavaScriptFrame::GetParameter(int index) const {
@@ skipping 304 matching lines @@
       if ((kJSCallerSaved & (1 << r)) != 0)
         reg_code[i++] = r;
 
     ASSERT(i == kNumJSCallerSaved);
   }
   ASSERT(0 <= n && n < kNumJSCallerSaved);
   return reg_code[n];
 }
 
 
+#define DEFINE_WRAPPER(type, field)                              \
+class field##_Wrapper : public ZoneObject {                      \
+ public:  /* NOLINT */                                           \
+  field##_Wrapper(const field& original) : frame_(original) {    \
+  }                                                              \
+  field frame_;                                                  \
+};
+STACK_FRAME_TYPE_LIST(DEFINE_WRAPPER)
+#undef DEFINE_WRAPPER
+
+static StackFrame* AllocateFrameCopy(StackFrame* frame) {
+#define FRAME_TYPE_CASE(type, field) \
+  case StackFrame::type: { \
+    field##_Wrapper* wrapper = \
+        new field##_Wrapper(*(reinterpret_cast<field*>(frame))); \
+    return &wrapper->frame_; \
+  }
+
+  switch (frame->type()) {
+    STACK_FRAME_TYPE_LIST(FRAME_TYPE_CASE)
+    default: UNREACHABLE();
+  }
+#undef FRAME_TYPE_CASE
+  return NULL;
+}
+
+Vector<StackFrame*> CreateStackMap() {
+  ZoneList<StackFrame*> list(10);
+  for (StackFrameIterator it; !it.done(); it.Advance()) {
+    StackFrame* frame = AllocateFrameCopy(it.frame());
+    list.Add(frame);
+  }
+  return list.ToVector();
+}
+
+
 } }  // namespace v8::internal