Direct call to native RegExp code from JavaScript

src/ia32/regexp-macro-assembler-ia32.h

 // Copyright 2008-2009 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
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   static const int kReturn_eip = kFramePointer + kPointerSize;
   static const int kFrameAlign = kReturn_eip + kPointerSize;
   // Parameters.
   static const int kInputString = kFrameAlign;
   static const int kStartIndex = kInputString + kPointerSize;
   static const int kInputStart = kStartIndex + kPointerSize;
   static const int kInputEnd = kInputStart + kPointerSize;
   static const int kRegisterOutput = kInputEnd + kPointerSize;
   static const int kAtStart = kRegisterOutput + kPointerSize;
   static const int kStackHighEnd = kAtStart + kPointerSize;
+  static const int kDirectCall = kStackHighEnd + kPointerSize;
   // Below the frame pointer - local stack variables.
   // When adding local variables remember to push space for them in
   // the frame in GetCode.
   static const int kBackup_esi = kFramePointer - kPointerSize;
   static const int kBackup_edi = kBackup_esi - kPointerSize;
   static const int kBackup_ebx = kBackup_edi - kPointerSize;
   static const int kInputStartMinusOne = kBackup_ebx - kPointerSize;
   // First register address. Following registers are below it on the stack.
   static const int kRegisterZero = kInputStartMinusOne - kPointerSize;
 
@@ skipping 82 matching lines @@
   Label backtrack_label_;
   Label exit_label_;
   Label check_preempt_label_;
   Label stack_overflow_label_;
 };
 #endif  // V8_NATIVE_REGEXP
 
 }}  // namespace v8::internal
 
 #endif  // V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_