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

src/arm/code-stubs-arm.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 570 matching lines @@
 // Currently only needed on ARM.
 class RegExpCEntryStub: public CodeStub {
  public:
   RegExpCEntryStub() {}
   virtual ~RegExpCEntryStub() {}
   void Generate(MacroAssembler* masm);
 
  private:
   Major MajorKey() { return RegExpCEntry; }
   int MinorKey() { return 0; }
+
+  bool NeedsImmovableCode() { return true; }
+
   const char* GetName() { return "RegExpCEntryStub"; }
 };
 
 
 // Trampoline stub to call into native code. To call safely into native code
 // in the presence of compacting GC (which can move code objects) we need to
 // keep the code which called into native pinned in the memory. Currently the
 // simplest approach is to generate such stub early enough so it can never be
 // moved by GC
 class DirectCEntryStub: public CodeStub {
  public:
   DirectCEntryStub() {}
   void Generate(MacroAssembler* masm);
   void GenerateCall(MacroAssembler* masm, ExternalReference function);
   void GenerateCall(MacroAssembler* masm, Register target);
 
  private:
   Major MajorKey() { return DirectCEntry; }
   int MinorKey() { return 0; }
+
+  bool NeedsImmovableCode() { return true; }
+
   const char* GetName() { return "DirectCEntryStub"; }
 };
 
 
 // Generate code to load an element from a pixel array. The receiver is assumed
 // to not be a smi and to have elements, the caller must guarantee this
 // precondition. If key is not a smi, then the generated code branches to
 // key_not_smi. Callers can specify NULL for key_not_smi to signal that a smi
 // check has already been performed on key so that the smi check is not
 // generated. If key is not a valid index within the bounds of the pixel array,
@@ skipping 37 matching lines @@
                                  bool load_elements_from_receiver,
                                  bool load_elements_map_from_elements,
                                  Label* key_not_smi,
                                  Label* value_not_smi,
                                  Label* not_pixel_array,
                                  Label* out_of_range);
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_CODE_STUBS_ARM_H_