A64: Implement pre-aging support for A64.

src/a64/macro-assembler-a64.h

 // Copyright 2013 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 1926 matching lines @@
   // recently run) and continues. A young function is therefore one which has a
   // normal frame setup sequence, and an old function has a code age sequence
   // which calls a code ageing stub.
 
   // Set up a basic stack frame for young code (or code exempt from ageing) with
   // type FUNCTION. It may be patched later for code ageing support. This is
   // done by to Code::PatchPlatformCodeAge and EmitCodeAgeSequence.
   //
   // This function takes an Assembler so it can be called from either a
   // MacroAssembler or a PatchingAssembler context.
-  static void EmitFrameSetupForCodeAgePatching(Assembler * assm);
+  static void EmitFrameSetupForCodeAgePatching(Assembler* assm);
 
   // Call EmitFrameSetupForCodeAgePatching from a MacroAssembler context.
   void EmitFrameSetupForCodeAgePatching();
 
   // Emit a code age sequence that calls the relevant code age stub. The code
   // generated by this sequence is expected to replace the code generated by
   // EmitFrameSetupForCodeAgePatching, and represents an old function.
   //
-  // It never makes sense to call this other than in a patching context, so this
-  // method only accepts a PatchingAssembler.
-  //
   // If stub is NULL, this function generates the code age sequence but omits
   // the stub address that is normally embedded in the instruction stream. This
   // can be used by debug code to verify code age sequences.
-  static void EmitCodeAgeSequence(PatchingAssembler * assm, Code * stub);
+  static void EmitCodeAgeSequence(Assembler* assm, Code* stub);
+
+  // Call EmitCodeAgeSequence from a MacroAssembler context.
+  void EmitCodeAgeSequence(Code* stub);
 
   // Return true if the sequence is a young sequence geneated by
   // EmitFrameSetupForCodeAgePatching. Otherwise, this method asserts that the
   // sequence is a code age sequence (emitted by EmitCodeAgeSequence).
   static bool IsYoungSequence(byte* sequence);
 
 #ifdef DEBUG
   // Return true if the sequence is a code age sequence generated by
   // EmitCodeAgeSequence.
   static bool IsCodeAgeSequence(byte* sequence);
@@ skipping 211 matching lines @@
 #error "Unsupported option"
 #define CODE_COVERAGE_STRINGIFY(x) #x
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 #endif  // V8_A64_MACRO_ASSEMBLER_A64_H_