Add the possibility for a code stub to be non-movable...

src/code-stubs.cc

 // Copyright 2006-2008 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 83 matching lines @@
 
     // Create the code object.
     CodeDesc desc;
     masm.GetCode(&desc);
 
     // Copy the generated code into a heap object.
     Code::Flags flags = Code::ComputeFlags(
         static_cast<Code::Kind>(GetCodeKind()),
         InLoop(),
         GetICState());
-    Handle<Code> new_object = Factory::NewCode(desc, flags, masm.CodeObject());
+    Handle<Code> new_object = Factory::NewCode(
+        desc, flags, masm.CodeObject(), NeedsImmovableCode());
     RecordCodeGeneration(*new_object, &masm);
     FinishCode(*new_object);
 
     // Update the dictionary and the root in Heap.
     Handle<NumberDictionary> dict =
         Factory::DictionaryAtNumberPut(
             Handle<NumberDictionary>(Heap::code_stubs()),
             GetKey(),
             new_object);
     Heap::public_set_code_stubs(*dict);
 
     code = *new_object;
   }
 
+  ASSERT(!NeedsImmovableCode() || Heap::lo_space()->Contains(code));
   return Handle<Code>(code);
 }
 
 
 MaybeObject* CodeStub::TryGetCode() {
   Code* code;
   if (!FindCodeInCache(&code)) {
     // Generate the new code.
     MacroAssembler masm(NULL, 256);
     GenerateCode(&masm);
@@ skipping 92 matching lines @@
   OS::SNPrintF(Vector<char>(name_, kMaxNameLength),
                "InstanceofStub%s%s%s",
                args,
                inline_check,
                return_true_false_object);
   return name_;
 }
 
 
 } }  // namespace v8::internal