1 /*
   2  * Copyright (c) 2003, 2010, 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 #ifndef CPU_ZERO_VM_ENTRY_ZERO_HPP
  27 #define CPU_ZERO_VM_ENTRY_ZERO_HPP
  28 
  29 class ZeroEntry {
  30  public:
  31   ZeroEntry() {
  32     ShouldNotCallThis();
  33   }
  34 
  35  private:
  36   address _entry_point;
  37 
  38  public:
  39   address entry_point() const {
  40     return _entry_point;
  41   }
  42   void set_entry_point(address entry_point) {
  43     _entry_point = entry_point;
  44   }
  45 
  46  private:
  47   typedef int (*NormalEntryFunc)(methodOop method,
  48                                  intptr_t  base_pc,
  49                                  TRAPS);
  50   typedef int (*OSREntryFunc)(methodOop method,
  51                               address   osr_buf,
  52                               intptr_t  base_pc,
  53                               TRAPS);
  54 
  55  public:
  56   void invoke(methodOop method, TRAPS) const {
  57     maybe_deoptimize(
  58       ((NormalEntryFunc) entry_point())(method, (intptr_t) this, THREAD),
  59       THREAD);
  60   }
  61   void invoke_osr(methodOop method, address osr_buf, TRAPS) const {
  62     maybe_deoptimize(
  63       ((OSREntryFunc) entry_point())(method, osr_buf, (intptr_t) this, THREAD),
  64       THREAD);
  65   }
  66 
  67  private:
  68   static void maybe_deoptimize(int deoptimized_frames, TRAPS) {
  69     if (deoptimized_frames)
  70       CppInterpreter::main_loop(deoptimized_frames - 1, THREAD);
  71   }
  72 
  73  public:
  74   static ByteSize entry_point_offset() {
  75     return byte_offset_of(ZeroEntry, _entry_point);
  76   }
  77 };
  78 
  79 #endif // CPU_ZERO_VM_ENTRY_ZERO_HPP