Use a reserved stack local variable to store the Code object so that it can be looked up easily whe…

vm/assembler_macros_x64.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler_macros.h"
 
 #include "vm/assembler.h"
@@ skipping 43 matching lines @@
     uword tags = 0;
     tags = RawObject::SizeTag::update(instance_size, tags);
     ASSERT(cls.index() != kIllegalObjectKind);
     tags = RawObject::ClassTag::update(cls.index(), tags);
     __ movq(FieldAddress(instance_reg, Object::tags_offset()), Immediate(tags));
   } else {
     __ jmp(failure);
   }
 }
 
+
+void AssemblerMacros::EnterDartFrame(Assembler* assembler,
+                                     intptr_t frame_size) {
+  const intptr_t offset = assembler->CodeSize();
+  __ EnterFrame(0);
+  Label dart_entry;
+  __ call(&dart_entry);
+  __ Bind(&dart_entry);
+  // Adjust saved PC for any intrinsic code that could have been generated
+  // before a frame is created.
+  if (offset != 0) {
+    __ addq(Address(RSP, 0), Immediate(-offset));
+  }
+  if (frame_size != 0) {
+    __ subq(RSP, Immediate(frame_size));
+  }
+}
+
+
+void AssemblerMacros::EnterStubFrame(Assembler* assembler) {
+  __ EnterFrame(0);
+  __ pushq(Immediate(0));  // Push 0 in the saved PC area for stub frames.
+}
+
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64