X64 implementation: Correct kTargetAddrToReturnAddrDist value for x64.

src/x64/macro-assembler-x64.cc

 // 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 319 matching lines @@
 void MacroAssembler::Call(Address destination, RelocInfo::Mode rmode) {
   movq(kScratchRegister, destination, rmode);
   call(kScratchRegister);
 }
 
 
 void MacroAssembler::Call(Handle<Code> code_object, RelocInfo::Mode rmode) {
   WriteRecordedPositions();
   ASSERT(RelocInfo::IsCodeTarget(rmode));
   movq(kScratchRegister, code_object, rmode);
+#ifdef DEBUG
+  Label target;
+  bind(&target);
+#endif
   call(kScratchRegister);
+#ifdef DEBUG
+  ASSERT_EQ(kTargetAddrToReturnAddrDist,
+            SizeOfCodeGeneratedSince(&target) + kPointerSize);
+#endif
 }
 
 
 void MacroAssembler::PushTryHandler(CodeLocation try_location,
                                     HandlerType type) {
   // Adjust this code if not the case.
   ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize);
 
   // The pc (return address) is already on TOS.  This code pushes state,
   // frame pointer and current handler.  Check that they are expected
@@ skipping 415 matching lines @@
   push(rcx);
 
   // Clear the top frame.
   ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address);
   movq(kScratchRegister, c_entry_fp_address);
   movq(Operand(kScratchRegister, 0), Immediate(0));
 }
 
 
 } }  // namespace v8::internal