Reimplement dynamic frame alignment for frames that are compiled via OSR or have more than 2 double…

src/frames.cc

 // Copyright 2012 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 451 matching lines @@
 }
 
 
 
 StackFrame::Type StackFrame::GetCallerState(State* state) const {
   ComputeCallerState(state);
   return ComputeType(isolate(), state);
 }
 
 
+Address StackFrame::UnpaddedFP() const {
+#if defined(V8_TARGET_ARCH_IA32) || defined(V8_HOST_ARCH_IA32)
+  if (!is_optimized()) return fp();
+  int32_t alignment_state = Memory::int32_at(
+    fp() + JavaScriptFrameConstants::kDynamicAlignmentStateOffset);
+
+  return (alignment_state == kAlignmentPaddingPushed) ?
+    (fp() + kPointerSize) : fp();
+#else
+  return fp();
+#endif
+}
+
+
 Code* EntryFrame::unchecked_code() const {
   return HEAP->raw_unchecked_js_entry_code();
 }
 
 
 void EntryFrame::ComputeCallerState(State* state) const {
   GetCallerState(state);
 }
 
 
@@ skipping 932 matching lines @@
   ZoneList<StackFrame*> list(10, zone);
   for (StackFrameIterator it; !it.done(); it.Advance()) {
     StackFrame* frame = AllocateFrameCopy(it.frame(), zone);
     list.Add(frame, zone);
   }
   return list.ToVector();
 }
 
 
 } }  // namespace v8::internal