1 /*
   2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_COMPILER_OOPMAPSTUBGENERATOR_HPP
  26 #define SHARE_COMPILER_OOPMAPSTUBGENERATOR_HPP
  27 
  28 #include "asm/assembler.hpp"
  29 #include "memory/allocation.hpp"
  30 
  31 class ImmutableOopMap;
  32 class BufferBlob;
  33 
  34 class OopMapStubGenerator {
  35   static intptr_t code_cache_base;
  36 
  37   const CodeBlob* _cb;
  38   const ImmutableOopMap& _oopmap;
  39   BufferBlob* _blob;
  40   address _freeze_stub;
  41   address _thaw_stub;
  42 
  43 public:
  44   OopMapStubGenerator(const CodeBlob* cb, const ImmutableOopMap& oopmap) : _cb(cb), _oopmap(oopmap), _blob(NULL), _freeze_stub(NULL), _thaw_stub(NULL) {}
  45 
  46   address freeze_stub() { return _freeze_stub; }
  47   address thaw_stub() { return _thaw_stub; }
  48   bool generate();
  49   void free();
  50 
  51   static void init();
  52   
  53   static address thaw_stub(address freeze_stub_address);
  54   static CodeBlob* code_blob(address thaw_stub_address);
  55   static intptr_t stub_to_offset(address stub);
  56   static address offset_to_stub(intptr_t offset);
  57 };
  58 
  59 #endif