Support debugger inspection of locals in optimized frames

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index d81d5afaaa7370f4198afb8881d91a6bfd73c020..4e67463f1fb75c31e29d32d39480470944c58c06 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -528,6 +528,17 @@ Address StandardFrame::GetExpressionAddress(int n) const {
 }
 
 
+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;
@@ -646,6 +657,16 @@ bool JavaScriptFrame::IsConstructor() const {
 }
 
 
+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();
@@ -812,6 +833,22 @@ DeoptimizationInputData* OptimizedFrame::GetDeoptimizationData(
 }
 
 
+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());