Support debugger inspection of locals in optimized frames

src/frames.cc

 // Copyright 2011 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 510 matching lines @@
   state->pc_address = reinterpret_cast<Address*>(sp - 1 * kPointerSize);
 }
 
 
 Address StandardFrame::GetExpressionAddress(int n) const {
   const int offset = StandardFrameConstants::kExpressionsOffset;
   return fp() + offset - n * kPointerSize;
 }
 
 
+Object* StandardFrame::GetExpression(Address fp, int index) {
+  return Memory::Object_at(GetExpressionAddress(fp, index));
+}
+
+
+Address StandardFrame::GetExpressionAddress(Address fp, int n) {
+  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);
 }
 
@@ skipping 98 matching lines @@
 bool JavaScriptFrame::IsConstructor() const {
   Address fp = caller_fp();
   if (has_adapted_arguments()) {
     // Skip the arguments adaptor frame and look at the real caller.
     fp = Memory::Address_at(fp + StandardFrameConstants::kCallerFPOffset);
   }
   return IsConstructFrame(fp);
 }
 
 
+int JavaScriptFrame::GetArgumentsLength() const {
+  // If there is an arguments adaptor frame get the arguments length from it.
+  if (has_adapted_arguments()) {
+    return Smi::cast(GetExpression(caller_fp(), 0))->value();
+  } else {
+    return GetNumberOfIncomingArguments();
+  }
+}
+
+
 Code* JavaScriptFrame::unchecked_code() const {
   JSFunction* function = JSFunction::cast(this->function());
   return function->unchecked_code();
 }
 
 
 int JavaScriptFrame::GetNumberOfIncomingArguments() const {
   ASSERT(!SafeStackFrameIterator::is_active(isolate()) &&
          isolate()->heap()->gc_state() == Heap::NOT_IN_GC);
 
@@ skipping 146 matching lines @@
   ASSERT(code->kind() == Code::OPTIMIZED_FUNCTION);
 
   SafepointEntry safepoint_entry = code->GetSafepointEntry(pc());
   *deopt_index = safepoint_entry.deoptimization_index();
   ASSERT(*deopt_index != Safepoint::kNoDeoptimizationIndex);
 
   return DeoptimizationInputData::cast(code->deoptimization_data());
 }
 
 
+int OptimizedFrame::GetInlineCount() {
+  ASSERT(is_optimized());
+
+  int deopt_index = Safepoint::kNoDeoptimizationIndex;
+  DeoptimizationInputData* data = GetDeoptimizationData(&deopt_index);
+
+  TranslationIterator it(data->TranslationByteArray(),
+                         data->TranslationIndex(deopt_index)->value());
+  Translation::Opcode opcode = static_cast<Translation::Opcode>(it.Next());
+  ASSERT(opcode == Translation::BEGIN);
+  USE(opcode);
+  int frame_count = it.Next();
+  return frame_count;
+}
+
+
 void OptimizedFrame::GetFunctions(List<JSFunction*>* functions) {
   ASSERT(functions->length() == 0);
   ASSERT(is_optimized());
 
   int deopt_index = Safepoint::kNoDeoptimizationIndex;
   DeoptimizationInputData* data = GetDeoptimizationData(&deopt_index);
 
   TranslationIterator it(data->TranslationByteArray(),
                          data->TranslationIndex(deopt_index)->value());
   Translation::Opcode opcode = static_cast<Translation::Opcode>(it.Next());
@@ skipping 409 matching lines @@
   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