1 /* 2 * Copyright (c) 2002, 2019, 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 25 #ifndef CPU_SPARC_JAVAFRAMEANCHOR_SPARC_HPP 26 #define CPU_SPARC_JAVAFRAMEANCHOR_SPARC_HPP 27 28 private: 29 volatile int _flags; 30 31 public: 32 33 enum pd_Constants { 34 flushed = 1 // winodows have flushed 35 }; 36 37 int flags(void) { return _flags; } 38 void set_flags(int flags) { _flags = flags; } 39 40 static ByteSize flags_offset() { return byte_offset_of(JavaFrameAnchor, _flags); } 41 42 // Each arch must define clear, copy 43 // These are used by objects that only care about: 44 // 1 - initializing a new state (thread creation, javaCalls) 45 // 2 - saving a current state (javaCalls) 46 // 3 - restoring an old state (javaCalls) 47 48 void clear(void) { 49 // clearing _last_Java_sp must be first 50 _last_Java_sp = NULL; 51 // fence? 52 _flags = 0; 53 _last_Java_pc = NULL; 54 } 55 56 void copy(JavaFrameAnchor* src) { 57 // In order to make sure the transition state is valid for "this" 58 // We must clear _last_Java_sp before copying the rest of the new data 59 // 60 // Hack Alert: Temporary bugfix for 4717480/4721647 61 // To act like previous version (pd_cache_state) don't NULL _last_Java_sp 62 // unless the value is changing 63 // 64 if (_last_Java_sp != src->_last_Java_sp) 65 _last_Java_sp = NULL; 66 67 _flags = src->_flags; 68 _last_Java_pc = src->_last_Java_pc; 69 // Must be last so profiler will always see valid frame if has_last_frame() is true 70 _last_Java_sp = src->_last_Java_sp; 71 } 72 73 // Is stack walkable 74 inline bool walkable( void) { 75 return _flags & flushed; 76 } 77 78 void make_walkable(JavaThread* thread); 79 80 void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; } 81 82 address last_Java_pc(void) { return _last_Java_pc; } 83 84 // These are only used by friends 85 private: 86 87 intptr_t* last_Java_sp() const { 88 // _last_Java_sp will always be a an unbiased stack pointer 89 // if is is biased then some setter screwed up. This is 90 // deadly. 91 assert(((intptr_t)_last_Java_sp & 0xF) == 0, "Biased last_Java_sp"); 92 return _last_Java_sp; 93 } 94 95 void capture_last_Java_pc(intptr_t* sp); 96 97 void set_window_flushed( void) { 98 _flags |= flushed; 99 OrderAccess::fence(); 100 } 101 102 #endif // CPU_SPARC_JAVAFRAMEANCHOR_SPARC_HPP