Version 3.0.9...

src/x64/frames-x64.h

 // Copyright 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 27 matching lines @@
     1 << 2 |  // rdx
     1 << 3 |  // rbx - used as a caller-saved register in JavaScript code
     1 << 7;   // rdi - callee function
 
 static const int kNumJSCallerSaved = 5;
 
 typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];
 
 // Number of registers for which space is reserved in safepoints.
 // TODO(x64): This should not be 0.
-static const int kNumSafepointRegisters = 0;
+static const int kNumSafepointRegisters = 8;
 
 // ----------------------------------------------------
 
 class StackHandlerConstants : public AllStatic {
  public:
   static const int kNextOffset  = 0 * kPointerSize;
   static const int kFPOffset    = 1 * kPointerSize;
   static const int kStateOffset = 2 * kPointerSize;
   static const int kPCOffset    = 3 * kPointerSize;
 
@@ skipping 63 matching lines @@
 
 
 inline Object* JavaScriptFrame::function_slot_object() const {
   const int offset = JavaScriptFrameConstants::kFunctionOffset;
   return Memory::Object_at(fp() + offset);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_FRAMES_X64_H_