javaFrameAnchor_x86.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 2002, 2007, 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 25private: 26 27 // FP value associated with _last_Java_sp: 28 intptr_t* volatile _last_Java_fp; // pointer is volatile not what it points to 29 30public: 31 // Each arch must define reset, save, restore 32 // These are used by objects that only care about: 33 // 1 - initializing a new state (thread creation, javaCalls) 34 // 2 - saving a current state (javaCalls) 35 // 3 - restoring an old state (javaCalls) 36 37 void clear(void) { 38 // clearing _last_Java_sp must be first 39 _last_Java_sp = NULL; 40 // fence? 41 _last_Java_fp = NULL; 42 _last_Java_pc = NULL; 43 } 44 45 void copy(JavaFrameAnchor* src) { 46 // In order to make sure the transition state is valid for "this" 47 // We must clear _last_Java_sp before copying the rest of the new data 48 // 49 // Hack Alert: Temporary bugfix for 4717480/4721647 50 // To act like previous version (pd_cache_state) don't NULL _last_Java_sp 51 // unless the value is changing 52 // 53 if (_last_Java_sp != src->_last_Java_sp) 54 _last_Java_sp = NULL; 55 56 _last_Java_fp = src->_last_Java_fp; 57 _last_Java_pc = src->_last_Java_pc; 58 // Must be last so profiler will always see valid frame if has_last_frame() is true 59 _last_Java_sp = src->_last_Java_sp; 60 } 61 62 // Always walkable 63 bool walkable(void) { return true; } 64 // Never any thing to do since we are always walkable and can find address of return addresses 65 void make_walkable(JavaThread* thread) { } 66 67 intptr_t* last_Java_sp(void) const { return _last_Java_sp; } 68 69private: 70 71 static ByteSize last_Java_fp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); } 72 73public: 74 75 void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; } 76 77 intptr_t* last_Java_fp(void) { return _last_Java_fp; } 78 // Assert (last_Java_sp == NULL || fp == NULL) 79 void set_last_Java_fp(intptr_t* fp) { _last_Java_fp = fp; } 80