1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2016 SAP SE. All rights reserved. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #ifndef CPU_S390_VM_JAVAFRAMEANCHOR_S390_HPP 27 #define CPU_S390_VM_JAVAFRAMEANCHOR_S390_HPP 28 29 public: 30 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 inline void clear(void) { 38 // Clearing _last_Java_sp must be first. 39 OrderAccess::release(); 40 _last_Java_sp = NULL; 41 // Fence? 42 OrderAccess::fence(); 43 44 _last_Java_pc = NULL; 45 } 46 47 inline void set(intptr_t* sp, address pc) { 48 _last_Java_pc = pc; 49 50 OrderAccess::release(); 51 _last_Java_sp = sp; 52 } 53 54 void copy(JavaFrameAnchor* src) { 55 // In order to make sure the transition state is valid for "this" 56 // we must clear _last_Java_sp before copying the rest of the new data. 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 OrderAccess::release(); 63 _last_Java_sp = NULL; 64 OrderAccess::fence(); 65 } 66 _last_Java_pc = src->_last_Java_pc; 67 // Must be last so profiler will always see valid frame if has_last_frame() is true. 68 69 OrderAccess::release(); 70 _last_Java_sp = src->_last_Java_sp; 71 } 72 73 // We don't have to flush registers, so the stack is always walkable. 74 inline bool walkable(void) { return true; } 75 inline void make_walkable(JavaThread* thread) { } 76 77 public: 78 79 // We don't have a frame pointer. 80 intptr_t* last_Java_fp(void) { return NULL; } 81 82 intptr_t* last_Java_sp() const { return _last_Java_sp; } 83 void set_last_Java_sp(intptr_t* sp) { OrderAccess::release(); _last_Java_sp = sp; } 84 85 address last_Java_pc(void) { return _last_Java_pc; } 86 87 #endif // CPU_S390_VM_JAVAFRAMEANCHOR_S390_HPP