Make some constants' meaning clear for X64

src/x64/assembler-x64.cc

 // Copyright 2012 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 146 matching lines @@
   delete memory;
 }
 
 
 // -----------------------------------------------------------------------------
 // Implementation of RelocInfo
 
 // Patch the code at the current PC with a call to the target address.
 // Additional guard int3 instructions can be added if required.
 void RelocInfo::PatchCodeWithCall(Address target, int guard_bytes) {
-  // Load register with immediate 64 and call through a register instructions
-  // takes up 13 bytes and int3 takes up one byte.
-  static const int kCallCodeSize = 13;
-  int code_size = kCallCodeSize + guard_bytes;
+  int code_size = Assembler::kCallSequenceLength + guard_bytes;
 
   // Create a code patcher.
   CodePatcher patcher(pc_, code_size);
 
   // Add a label for checking the size of the code used for returning.
 #ifdef DEBUG
   Label check_codesize;
   patcher.masm()->bind(&check_codesize);
 #endif
 
   // Patch the code.
   patcher.masm()->movq(r10, target, RelocInfo::NONE64);
   patcher.masm()->call(r10);
 
   // Check that the size of the code generated is as expected.
-  ASSERT_EQ(kCallCodeSize,
+  ASSERT_EQ(Assembler::kCallSequenceLength,
             patcher.masm()->SizeOfCodeGeneratedSince(&check_codesize));
 
   // Add the requested number of int3 instructions after the call.
   for (int i = 0; i < guard_bytes; i++) {
     patcher.masm()->int3();
   }
 }
 
 
 void RelocInfo::PatchCode(byte* instructions, int instruction_count) {
@@ skipping 2916 matching lines @@
 bool RelocInfo::IsCodedSpecially() {
   // The deserializer needs to know whether a pointer is specially coded.  Being
   // specially coded on x64 means that it is a relative 32 bit address, as used
   // by branch instructions.
   return (1 << rmode_) & kApplyMask;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64