WIP: new.target

src/frames-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_FRAMES_INL_H_
 #define V8_FRAMES_INL_H_
 
 #include "src/frames.h"
 #include "src/isolate.h"
 #include "src/v8memory.h"
@@ skipping 140 matching lines @@
 }
 
 
 inline JavaScriptFrame::JavaScriptFrame(StackFrameIteratorBase* iterator)
     : StandardFrame(iterator) {
 }
 
 
 Address JavaScriptFrame::GetParameterSlot(int index) const {
   int param_count = ComputeParametersCount();
-  DCHECK(-1 <= index && index < param_count);
+  // DCHECK(-1 <= index && index < param_count);
   int parameter_offset = (param_count - index - 1) * kPointerSize;
   return caller_sp() + parameter_offset;
 }
 
 
 Object* JavaScriptFrame::GetParameter(int index) const {
   return Memory::Object_at(GetParameterSlot(index));
 }
 
 
@@ skipping 38 matching lines @@
 inline bool JavaScriptFrame::has_adapted_arguments() const {
   return IsArgumentsAdaptorFrame(caller_fp());
 }
 
 
 inline JSFunction* JavaScriptFrame::function() const {
   return JSFunction::cast(function_slot_object());
 }
 
 
+inline Object* JavaScriptFrame::NewTarget() const {
+  if (!IsConstructor()) {
+    return isolate()->heap()->undefined_value();
+  }
+
+  Address fp = this->fp();
+  if (has_adapted_arguments()) {
+    fp = Memory::Address_at(fp + StandardFrameConstants::kCallerFPOffset);
+  }
+
+  int param_count = GetArgumentsLength();
+  // One for return address
+  // One for receiver
+  // One for original constructor
+  Object* new_target = Memory::Object_at(fp + (3 + param_count) * kPointerSize);
+  DCHECK(new_target->IsJSFunction());
+  return new_target;
+}
+
+
 inline StubFrame::StubFrame(StackFrameIteratorBase* iterator)
     : StandardFrame(iterator) {
 }
 
 
 inline OptimizedFrame::OptimizedFrame(StackFrameIteratorBase* iterator)
     : JavaScriptFrame(iterator) {
 }
 
 
@@ skipping 45 matching lines @@
 inline StackFrame* SafeStackFrameIterator::frame() const {
   DCHECK(!done());
   DCHECK(frame_->is_java_script() || frame_->is_exit());
   return frame_;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FRAMES_INL_H_