Landing for Zaheer Ahmad.

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
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   virtual ~RegExpCEntryStub() {}
   void Generate(MacroAssembler* masm);
 
  private:
   Major MajorKey() { return RegExpCEntry; }
   int MinorKey() { return 0; }
   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, ApiFunction *function);
+
+ private:
+  Major MajorKey() { return DirectCEntry; }
+  int MinorKey() { return 0; }
+  const char* GetName() { return "DirectCEntryStub"; }
+};
+
+
 // Generate code the 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 the receiver does not have elements that are pixel arrays,
 // the generated code jumps to not_pixel_array. 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, the generated code jumps to out_of_range.
 void GenerateFastPixelArrayLoad(MacroAssembler* masm,
                                 Register receiver,
                                 Register key,
                                 Register elements_map,
                                 Register elements,
                                 Register scratch1,
                                 Register scratch2,
                                 Register result,
                                 Label* not_pixel_array,
                                 Label* key_not_smi,
                                 Label* out_of_range);
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_CODE_STUBS_ARM_H_