[builtins] Add receiver to builtin exit frames

src/frames-inl.h

Index: src/frames-inl.h
diff --git a/src/frames-inl.h b/src/frames-inl.h
index ef51e0d5767d6935b5b266d23e070c1bcc9ce002..bc2ff4fb6a8b5d74d57bec9e667af00c6b6f18db 100644
--- a/src/frames-inl.h
+++ b/src/frames-inl.h
@@ -101,10 +101,30 @@ inline ExitFrame::ExitFrame(StackFrameIteratorBase* iterator)
 inline BuiltinExitFrame::BuiltinExitFrame(StackFrameIteratorBase* iterator)
     : ExitFrame(iterator) {}
 
-inline Object* BuiltinExitFrame::function_slot_object() const {
+inline Object* BuiltinExitFrame::target_slot_object() const {
   return Memory::Object_at(fp() + BuiltinExitFrameConstants::kTargetOffset);
 }
 
+inline Object* BuiltinExitFrame::new_target_slot_object() const {
+  return Memory::Object_at(fp() + BuiltinExitFrameConstants::kNewTargetOffset);
+}
+
+inline Object* BuiltinExitFrame::receiver_slot_object() const {
+  // The receiver is the first argument on the frame.
+  // fp[1]: return address.
+  // fp[2]: the last argument (new target).
+  // fp[4]: argc.
+  // fp[2 + argc - 1]: receiver.
+  Object* argc_slot =
+      Memory::Object_at(fp() + BuiltinExitFrameConstants::kArgcOffset);
+  DCHECK(argc_slot->IsSmi());
+  int argc = Smi::cast(argc_slot)->value();
+
+  const int receiverOffset =
+      BuiltinExitFrameConstants::kNewTargetOffset + (argc - 1) * kPointerSize;
+  return Memory::Object_at(fp() + receiverOffset);
+}
+
 inline StandardFrame::StandardFrame(StackFrameIteratorBase* iterator)
     : StackFrame(iterator) {
 }