X64: Implement debugger hooks.

src/execution.h

 // 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 188 matching lines @@
       thread_local_.jslimit_ = thread_local_.initial_jslimit_;
       thread_local_.climit_ = thread_local_.initial_climit_;
     }
   }
 
   // Enable or disable interrupts.
   static void EnableInterrupts();
   static void DisableInterrupts();
 
   static const uintptr_t kLimitSize = kPointerSize * 128 * KB;
+#ifdef V8_TARGET_ARCH_X64
+  static const uintptr_t kInterruptLimit = V8_UINT64_C(0xfffffffffffffffe);
+  static const uintptr_t kIllegalLimit = V8_UINT64_C(0xffffffffffffffff);
+#else
   static const uintptr_t kInterruptLimit = 0xfffffffe;
   static const uintptr_t kIllegalLimit = 0xffffffff;
+#endif
 
   class ThreadLocal {
    public:
     ThreadLocal()
      : initial_jslimit_(kIllegalLimit),
        jslimit_(kIllegalLimit),
        initial_climit_(kIllegalLimit),
        climit_(kIllegalLimit),
        nesting_(0),
        postpone_interrupts_nesting_(0),
@@ skipping 54 matching lines @@
       v8::Handle<v8::String> name);
   static v8::Handle<v8::Value> GC(const v8::Arguments& args);
  private:
   static const char* kSource;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_EXECUTION_H_