1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/cpu/x86/vm/javaFrameAnchor_x86.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,86 @@
1.4 +/*
1.5 + * Copyright (c) 2002, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef CPU_X86_VM_JAVAFRAMEANCHOR_X86_HPP
1.29 +#define CPU_X86_VM_JAVAFRAMEANCHOR_X86_HPP
1.30 +
1.31 +private:
1.32 +
1.33 + // FP value associated with _last_Java_sp:
1.34 + intptr_t* volatile _last_Java_fp; // pointer is volatile not what it points to
1.35 +
1.36 +public:
1.37 + // Each arch must define reset, save, restore
1.38 + // These are used by objects that only care about:
1.39 + // 1 - initializing a new state (thread creation, javaCalls)
1.40 + // 2 - saving a current state (javaCalls)
1.41 + // 3 - restoring an old state (javaCalls)
1.42 +
1.43 + void clear(void) {
1.44 + // clearing _last_Java_sp must be first
1.45 + _last_Java_sp = NULL;
1.46 + // fence?
1.47 + _last_Java_fp = NULL;
1.48 + _last_Java_pc = NULL;
1.49 + }
1.50 +
1.51 + void copy(JavaFrameAnchor* src) {
1.52 + // In order to make sure the transition state is valid for "this"
1.53 + // We must clear _last_Java_sp before copying the rest of the new data
1.54 + //
1.55 + // Hack Alert: Temporary bugfix for 4717480/4721647
1.56 + // To act like previous version (pd_cache_state) don't NULL _last_Java_sp
1.57 + // unless the value is changing
1.58 + //
1.59 + if (_last_Java_sp != src->_last_Java_sp)
1.60 + _last_Java_sp = NULL;
1.61 +
1.62 + _last_Java_fp = src->_last_Java_fp;
1.63 + _last_Java_pc = src->_last_Java_pc;
1.64 + // Must be last so profiler will always see valid frame if has_last_frame() is true
1.65 + _last_Java_sp = src->_last_Java_sp;
1.66 + }
1.67 +
1.68 + // Always walkable
1.69 + bool walkable(void) { return true; }
1.70 + // Never any thing to do since we are always walkable and can find address of return addresses
1.71 + void make_walkable(JavaThread* thread) { }
1.72 +
1.73 + intptr_t* last_Java_sp(void) const { return _last_Java_sp; }
1.74 +
1.75 + address last_Java_pc(void) { return _last_Java_pc; }
1.76 +
1.77 +private:
1.78 +
1.79 + static ByteSize last_Java_fp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); }
1.80 +
1.81 +public:
1.82 +
1.83 + void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; }
1.84 +
1.85 + intptr_t* last_Java_fp(void) { return _last_Java_fp; }
1.86 + // Assert (last_Java_sp == NULL || fp == NULL)
1.87 + void set_last_Java_fp(intptr_t* fp) { _last_Java_fp = fp; }
1.88 +
1.89 +#endif // CPU_X86_VM_JAVAFRAMEANCHOR_X86_HPP
