Implemented missing pieces of the debugger for ARM

src/arm/macro-assembler-arm.h

 // Copyright 2006-2009 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 321 matching lines @@
   // Get the code for the given builtin. Returns if able to resolve
   // the function in the 'resolved' flag.
   Handle<Code> ResolveBuiltin(Builtins::JavaScript id, bool* resolved);
 
   // Activation support.
   void EnterFrame(StackFrame::Type type);
   void LeaveFrame(StackFrame::Type type);
 };
 
 
+#ifdef ENABLE_DEBUGGER_SUPPORT
+// 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. It is not legal to emit
+// relocation information. If any of these constraints are violated it causes
+// an assertion to fail.
+class CodePatcher {
+ public:
+  CodePatcher(byte* address, int instructions);
+  virtual ~CodePatcher();
+
+  // Macro assembler to emit code.
+  MacroAssembler* masm() { return &masm_; }
+
+  // Emit an instruction directly.
+  void Emit(Instr x);
+
+  // Emit an address directly.
+  void Emit(Address addr);
+
+ private:
+  byte* address_;  // The address of the code being patched.
+  int instructions_;  // Number of instructions of the expected patch size.
+  int size_;  // Number of bytes of the expected patch size.
+  MacroAssembler masm_;  // Macro assembler used to generate the code.
+};
+#endif  // ENABLE_DEBUGGER_SUPPORT
+
+
 // -----------------------------------------------------------------------------
 // Static helper functions.
 
 // Generate a MemOperand for loading a field from an object.
 static inline MemOperand FieldMemOperand(Register object, int offset) {
   return MemOperand(object, offset - kHeapObjectTag);
 }
 
 
 #ifdef GENERATED_CODE_COVERAGE
 #define CODE_COVERAGE_STRINGIFY(x) #x
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_MACRO_ASSEMBLER_ARM_H_