javaFrameAnchor_sparc.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 2002, 2005, 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 volatile int _flags; 27 28public: 29 30 enum pd_Constants { 31 flushed = 1 // winodows have flushed 32 }; 33 34 int flags(void) { return _flags; } 35 void set_flags(int flags) { _flags = flags; } 36 37 static ByteSize flags_offset() { return byte_offset_of(JavaFrameAnchor, _flags); } 38 39 // Each arch must define clear, copy 40 // These are used by objects that only care about: 41 // 1 - initializing a new state (thread creation, javaCalls) 42 // 2 - saving a current state (javaCalls) 43 // 3 - restoring an old state (javaCalls) 44 45 void clear(void) { 46 // clearing _last_Java_sp must be first 47 _last_Java_sp = NULL; 48 // fence? 49 _flags = 0; 50 _last_Java_pc = NULL; 51 } 52 53 void copy(JavaFrameAnchor* src) { 54 // In order to make sure the transition state is valid for "this" 55 // We must clear _last_Java_sp before copying the rest of the new data 56 // 57 // Hack Alert: Temporary bugfix for 4717480/4721647 58 // To act like previous version (pd_cache_state) don't NULL _last_Java_sp 59 // unless the value is changing 60 // 61 if (_last_Java_sp != src->_last_Java_sp) 62 _last_Java_sp = NULL; 63 64 _flags = src->_flags; 65 _last_Java_pc = src->_last_Java_pc; 66 // Must be last so profiler will always see valid frame if has_last_frame() is true 67 _last_Java_sp = src->_last_Java_sp; 68 } 69 70 // Is stack walkable 71 inline bool walkable( void) { 72 return _flags & flushed; 73 } 74 75 void make_walkable(JavaThread* thread); 76 77 void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; } 78 79 // These are only used by friends 80private: 81 82 intptr_t* last_Java_sp() const { 83 // _last_Java_sp will always be a an unbiased stack pointer 84 // if is is biased then some setter screwed up. This is 85 // deadly. 86#ifdef _LP64 87 assert(((intptr_t)_last_Java_sp & 0xF) == 0, "Biased last_Java_sp"); 88#endif 89 return _last_Java_sp; 90 } 91 92 void capture_last_Java_pc(intptr_t* sp); 93 94 void set_window_flushed( void) { 95 _flags |= flushed; 96 OrderAccess::fence(); 97 } 98