1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/src/cpu/x86/vm/javaFrameAnchor_x86.hpp Sat Dec 01 00:00:00 2007 +0000 1.3 @@ -0,0 +1,79 @@ 1.4 +/* 1.5 + * Copyright 2002-2007 Sun Microsystems, Inc. All Rights Reserved. 1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 1.7 + * 1.8 + * This code is free software; you can redistribute it and/or modify it 1.9 + * under the terms of the GNU General Public License version 2 only, as 1.10 + * published by the Free Software Foundation. 1.11 + * 1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT 1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1.15 + * version 2 for more details (a copy is included in the LICENSE file that 1.16 + * accompanied this code). 1.17 + * 1.18 + * You should have received a copy of the GNU General Public License version 1.19 + * 2 along with this work; if not, write to the Free Software Foundation, 1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1.21 + * 1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or 1.24 + * have any questions. 1.25 + * 1.26 + */ 1.27 + 1.28 +private: 1.29 + 1.30 + // FP value associated with _last_Java_sp: 1.31 + intptr_t* volatile _last_Java_fp; // pointer is volatile not what it points to 1.32 + 1.33 +public: 1.34 + // Each arch must define reset, save, restore 1.35 + // These are used by objects that only care about: 1.36 + // 1 - initializing a new state (thread creation, javaCalls) 1.37 + // 2 - saving a current state (javaCalls) 1.38 + // 3 - restoring an old state (javaCalls) 1.39 + 1.40 + void clear(void) { 1.41 + // clearing _last_Java_sp must be first 1.42 + _last_Java_sp = NULL; 1.43 + // fence? 1.44 + _last_Java_fp = NULL; 1.45 + _last_Java_pc = NULL; 1.46 + } 1.47 + 1.48 + void copy(JavaFrameAnchor* src) { 1.49 + // In order to make sure the transition state is valid for "this" 1.50 + // We must clear _last_Java_sp before copying the rest of the new data 1.51 + // 1.52 + // Hack Alert: Temporary bugfix for 4717480/4721647 1.53 + // To act like previous version (pd_cache_state) don't NULL _last_Java_sp 1.54 + // unless the value is changing 1.55 + // 1.56 + if (_last_Java_sp != src->_last_Java_sp) 1.57 + _last_Java_sp = NULL; 1.58 + 1.59 + _last_Java_fp = src->_last_Java_fp; 1.60 + _last_Java_pc = src->_last_Java_pc; 1.61 + // Must be last so profiler will always see valid frame if has_last_frame() is true 1.62 + _last_Java_sp = src->_last_Java_sp; 1.63 + } 1.64 + 1.65 + // Always walkable 1.66 + bool walkable(void) { return true; } 1.67 + // Never any thing to do since we are always walkable and can find address of return addresses 1.68 + void make_walkable(JavaThread* thread) { } 1.69 + 1.70 + intptr_t* last_Java_sp(void) const { return _last_Java_sp; } 1.71 + 1.72 +private: 1.73 + 1.74 + static ByteSize last_Java_fp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); } 1.75 + 1.76 +public: 1.77 + 1.78 + void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; } 1.79 + 1.80 + intptr_t* last_Java_fp(void) { return _last_Java_fp; } 1.81 + // Assert (last_Java_sp == NULL || fp == NULL) 1.82 + void set_last_Java_fp(intptr_t* fp) { _last_Java_fp = fp; }