1 /*
   2  * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2012, 2014 SAP SE. All rights reserved.
   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_PPC_VM_JAVAFRAMEANCHOR_PPC_HPP
  27 #define CPU_PPC_VM_JAVAFRAMEANCHOR_PPC_HPP
  28 
  29 public:
  30   // Each arch must define reset, save, restore
  31   // These are used by objects that only care about:
  32   //  1 - initializing a new state (thread creation, javaCalls)
  33   //  2 - saving a current state (javaCalls)
  34   //  3 - restoring an old state (javaCalls)
  35 
  36   inline void clear(void) {
  37     // clearing _last_Java_sp must be first
  38     _last_Java_sp = NULL;
  39     // fence?
  40     OrderAccess::release();
  41     _last_Java_pc = NULL;
  42   }
  43 
  44   inline void set(intptr_t* sp, address pc) {
  45     _last_Java_pc = pc;
  46     OrderAccess::release();
  47     _last_Java_sp = sp;
  48   }
  49 
  50   void copy(JavaFrameAnchor* src) {
  51     // In order to make sure the transition state is valid for "this".
  52     // We must clear _last_Java_sp before copying the rest of the new data.
  53     //
  54     // Hack Alert: Temporary bugfix for 4717480/4721647
  55     // To act like previous version (pd_cache_state) don't NULL _last_Java_sp
  56     // unless the value is changing.
  57     if (_last_Java_sp != src->_last_Java_sp) {
  58       _last_Java_sp = NULL;
  59       OrderAccess::release();
  60     }
  61     _last_Java_pc = src->_last_Java_pc;
  62     // Must be last so profiler will always see valid frame if has_last_frame() is true.
  63     OrderAccess::release();
  64     _last_Java_sp = src->_last_Java_sp;
  65   }
  66 
  67   // Always walkable.
  68   bool walkable(void) { return true; }
  69   // Never any thing to do since we are always walkable and can find address of return addresses.
  70   void make_walkable(JavaThread* thread) { }
  71 
  72   intptr_t* last_Java_sp(void) const  { return _last_Java_sp; }
  73 
  74   address last_Java_pc(void)          { return _last_Java_pc; }
  75 
  76   void set_last_Java_sp(intptr_t* sp) { OrderAccess::release(); _last_Java_sp = sp; }
  77 
  78 #endif // CPU_PPC_VM_JAVAFRAMEANCHOR_PPC_HPP