duke@435: /*
stefank@2314:  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef CPU_X86_VM_JAVAFRAMEANCHOR_X86_HPP
stefank@2314: #define CPU_X86_VM_JAVAFRAMEANCHOR_X86_HPP
stefank@2314: 
duke@435: private:
duke@435: 
duke@435:   // FP value associated with _last_Java_sp:
duke@435:   intptr_t* volatile        _last_Java_fp;           // pointer is volatile not what it points to
duke@435: 
duke@435: public:
duke@435:   // Each arch must define reset, save, restore
duke@435:   // These are used by objects that only care about:
duke@435:   //  1 - initializing a new state (thread creation, javaCalls)
duke@435:   //  2 - saving a current state (javaCalls)
duke@435:   //  3 - restoring an old state (javaCalls)
duke@435: 
duke@435:   void clear(void) {
duke@435:     // clearing _last_Java_sp must be first
duke@435:     _last_Java_sp = NULL;
duke@435:     // fence?
duke@435:     _last_Java_fp = NULL;
duke@435:     _last_Java_pc = NULL;
duke@435:   }
duke@435: 
duke@435:   void copy(JavaFrameAnchor* src) {
duke@435:     // In order to make sure the transition state is valid for "this"
duke@435:     // We must clear _last_Java_sp before copying the rest of the new data
duke@435:     //
duke@435:     // Hack Alert: Temporary bugfix for 4717480/4721647
duke@435:     // To act like previous version (pd_cache_state) don't NULL _last_Java_sp
duke@435:     // unless the value is changing
duke@435:     //
duke@435:     if (_last_Java_sp != src->_last_Java_sp)
duke@435:       _last_Java_sp = NULL;
duke@435: 
duke@435:     _last_Java_fp = src->_last_Java_fp;
duke@435:     _last_Java_pc = src->_last_Java_pc;
duke@435:     // Must be last so profiler will always see valid frame if has_last_frame() is true
duke@435:     _last_Java_sp = src->_last_Java_sp;
duke@435:   }
duke@435: 
duke@435:   // Always walkable
duke@435:   bool walkable(void) { return true; }
duke@435:   // Never any thing to do since we are always walkable and can find address of return addresses
duke@435:   void make_walkable(JavaThread* thread) { }
duke@435: 
duke@435:   intptr_t* last_Java_sp(void) const             { return _last_Java_sp; }
duke@435: 
bobv@2036:   address last_Java_pc(void)                     { return _last_Java_pc; }
bobv@2036: 
duke@435: private:
duke@435: 
duke@435:   static ByteSize last_Java_fp_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); }
duke@435: 
duke@435: public:
duke@435: 
duke@435:   void set_last_Java_sp(intptr_t* sp)            { _last_Java_sp = sp; }
duke@435: 
duke@435:   intptr_t*   last_Java_fp(void)                     { return _last_Java_fp; }
duke@435:   // Assert (last_Java_sp == NULL || fp == NULL)
duke@435:   void set_last_Java_fp(intptr_t* fp)                { _last_Java_fp = fp; }
stefank@2314: 
stefank@2314: #endif // CPU_X86_VM_JAVAFRAMEANCHOR_X86_HPP