1 /*
   2  * Copyright (c) 2003, 2007, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright 2008, 2009, 2010 Red Hat, Inc.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 class ZeroEntry {
  27  public:
  28   ZeroEntry() {
  29     ShouldNotCallThis();
  30   }
  31 
  32  private:
  33   address _entry_point;
  34 
  35  public:
  36   address entry_point() const {
  37     return _entry_point;
  38   }
  39   void set_entry_point(address entry_point) {
  40     _entry_point = entry_point;
  41   }
  42 
  43  private:
  44   typedef int (*NormalEntryFunc)(methodOop method,
  45                                  intptr_t  base_pc,
  46                                  TRAPS);
  47   typedef int (*OSREntryFunc)(methodOop method,
  48                               address   osr_buf,
  49                               intptr_t  base_pc,
  50                               TRAPS);
  51 
  52  public:
  53   void invoke(methodOop method, TRAPS) const {
  54     maybe_deoptimize(
  55       ((NormalEntryFunc) entry_point())(method, (intptr_t) this, THREAD),
  56       THREAD);
  57   }
  58   void invoke_osr(methodOop method, address osr_buf, TRAPS) const {
  59     maybe_deoptimize(
  60       ((OSREntryFunc) entry_point())(method, osr_buf, (intptr_t) this, THREAD),
  61       THREAD);
  62   }
  63 
  64  private:
  65   static void maybe_deoptimize(int deoptimized_frames, TRAPS) {
  66     if (deoptimized_frames)
  67       CppInterpreter::main_loop(deoptimized_frames - 1, THREAD);
  68   }
  69 
  70  public:
  71   static ByteSize entry_point_offset() {
  72     return byte_offset_of(ZeroEntry, _entry_point);
  73   }
  74 };