1 /* 2 * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved. 3 * Copyright 2007, 2008 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 21 * CA 95054 USA or visit www.sun.com if you need additional information or 22 * have any questions. 23 * 24 */ 25 26 public: 27 // Each arch must define reset, save, restore 28 // These are used by objects that only care about: 29 // 1 - initializing a new state (thread creation, javaCalls) 30 // 2 - saving a current state (javaCalls) 31 // 3 - restoring an old state (javaCalls) 32 33 void clear() { 34 // clearing _last_Java_sp must be first 35 _last_Java_sp = NULL; 36 // fence? 37 _last_Java_pc = NULL; 38 } 39 40 void copy(JavaFrameAnchor* src) { 41 // In order to make sure the transition state is valid for "this" 42 // We must clear _last_Java_sp before copying the rest of the new 43 // data 44 // 45 // Hack Alert: Temporary bugfix for 4717480/4721647 To act like 46 // previous version (pd_cache_state) don't NULL _last_Java_sp 47 // unless the value is changing 48 // 49 if (_last_Java_sp != src->_last_Java_sp) 50 _last_Java_sp = NULL; 51 52 _last_Java_pc = src->_last_Java_pc; 53 // Must be last so profiler will always see valid frame if 54 // has_last_frame() is true 55 _last_Java_sp = src->_last_Java_sp; 56 } 57 58 bool walkable() { 59 return true; 60 } 61 62 void make_walkable(JavaThread* thread) { 63 // nothing to do 64 } 65 66 intptr_t* last_Java_sp() const { 67 return _last_Java_sp; 68 } 69 70 void set_last_Java_sp(intptr_t* sp) { 71 _last_Java_sp = sp; 72 }