Use near labels in write barrier code.

src/ia32/macro-assembler-ia32.h

 // Copyright 2010 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 52 matching lines @@
 
   // For page containing |object| mark region covering |addr| dirty.
   // RecordWriteHelper only works if the object is not in new
   // space.
   void RecordWriteHelper(Register object,
                          Register addr,
                          Register scratch);
 
   // Check if object is in new space.
   // scratch can be object itself, but it will be clobbered.
+  template <typename LabelType>
   void InNewSpace(Register object,
                   Register scratch,
                   Condition cc,  // equal for new space, not_equal otherwise.
-                  Label* branch);
+                  LabelType* branch);
 
   // For page containing |object| mark region covering [object+offset]
   // dirty. |object| is the object being stored into, |value| is the
   // object being stored. If offset is zero, then the scratch register
   // contains the array index into the elements array represented as a
   // Smi. All registers are clobbered by the operation. RecordWrite
   // filters out smis so it does not update the write barrier if the
   // value is a smi.
   void RecordWrite(Register object,
                    int offset,
@@ skipping 564 matching lines @@
 
   // Helper for PopHandleScope.  Allowed to perform a GC and returns
   // NULL if gc_allowed.  Does not perform a GC if !gc_allowed, and
   // possibly returns a failure object indicating an allocation failure.
   MUST_USE_RESULT MaybeObject* PopHandleScopeHelper(Register saved,
                                                     Register scratch,
                                                     bool gc_allowed);
 };
 
 
+template <typename LabelType>
+void MacroAssembler::InNewSpace(Register object,
+                                Register scratch,
+                                Condition cc,
+                                LabelType* branch) {
+  ASSERT(cc == equal || cc == not_equal);
+  if (Serializer::enabled()) {
+    // Can't do arithmetic on external references if it might get serialized.
+    mov(scratch, Operand(object));
+    // The mask isn't really an address.  We load it as an external reference in
+    // case the size of the new space is different between the snapshot maker
+    // and the running system.
+    and_(Operand(scratch), Immediate(ExternalReference::new_space_mask()));
+    cmp(Operand(scratch), Immediate(ExternalReference::new_space_start()));
+    j(cc, branch);
+  } else {
+    int32_t new_space_start = reinterpret_cast<int32_t>(
+        ExternalReference::new_space_start().address());
+    lea(scratch, Operand(object, -new_space_start));
+    and_(scratch, Heap::NewSpaceMask());
+    j(cc, branch);
+  }
+}
+
+
 // The code patcher is used to patch (typically) small parts of code e.g. for
 // debugging and other types of instrumentation. When using the code patcher
 // the exact number of bytes specified must be emitted. Is not legal to emit
 // relocation information. If any of these constraints are violated it causes
 // an assertion.
 class CodePatcher {
  public:
   CodePatcher(byte* address, int size);
   virtual ~CodePatcher();
 
@@ skipping 68 matching lines @@
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_MACRO_ASSEMBLER_IA32_H_