Mercurial > hg > truffle
diff src/cpu/x86/vm/javaFrameAnchor_x86.hpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/cpu/x86/vm/javaFrameAnchor_x86.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,79 @@ +/* + * Copyright 2002-2007 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +private: + + // FP value associated with _last_Java_sp: + intptr_t* volatile _last_Java_fp; // pointer is volatile not what it points to + +public: + // Each arch must define reset, save, restore + // These are used by objects that only care about: + // 1 - initializing a new state (thread creation, javaCalls) + // 2 - saving a current state (javaCalls) + // 3 - restoring an old state (javaCalls) + + void clear(void) { + // clearing _last_Java_sp must be first + _last_Java_sp = NULL; + // fence? + _last_Java_fp = NULL; + _last_Java_pc = NULL; + } + + void copy(JavaFrameAnchor* src) { + // In order to make sure the transition state is valid for "this" + // We must clear _last_Java_sp before copying the rest of the new data + // + // Hack Alert: Temporary bugfix for 4717480/4721647 + // To act like previous version (pd_cache_state) don't NULL _last_Java_sp + // unless the value is changing + // + if (_last_Java_sp != src->_last_Java_sp) + _last_Java_sp = NULL; + + _last_Java_fp = src->_last_Java_fp; + _last_Java_pc = src->_last_Java_pc; + // Must be last so profiler will always see valid frame if has_last_frame() is true + _last_Java_sp = src->_last_Java_sp; + } + + // Always walkable + bool walkable(void) { return true; } + // Never any thing to do since we are always walkable and can find address of return addresses + void make_walkable(JavaThread* thread) { } + + intptr_t* last_Java_sp(void) const { return _last_Java_sp; } + +private: + + static ByteSize last_Java_fp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); } + +public: + + void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; } + + intptr_t* last_Java_fp(void) { return _last_Java_fp; } + // Assert (last_Java_sp == NULL || fp == NULL) + void set_last_Java_fp(intptr_t* fp) { _last_Java_fp = fp; }