author | chegar |
Wed, 16 Dec 2015 12:17:03 +0000 | |
changeset 34705 | 228508cfabc4 |
parent 7397 | 5b173b4ca846 |
child 40644 | 39e631ed7145 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#ifndef CPU_X86_VM_JAVAFRAMEANCHOR_X86_HPP |
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#define CPU_X86_VM_JAVAFRAMEANCHOR_X86_HPP |
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private: |
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// FP value associated with _last_Java_sp: |
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intptr_t* volatile _last_Java_fp; // pointer is volatile not what it points to |
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public: |
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// Each arch must define reset, save, restore |
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// These are used by objects that only care about: |
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// 1 - initializing a new state (thread creation, javaCalls) |
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// 2 - saving a current state (javaCalls) |
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// 3 - restoring an old state (javaCalls) |
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void clear(void) { |
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// clearing _last_Java_sp must be first |
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_last_Java_sp = NULL; |
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// fence? |
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_last_Java_fp = NULL; |
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_last_Java_pc = NULL; |
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} |
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void copy(JavaFrameAnchor* src) { |
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// In order to make sure the transition state is valid for "this" |
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// We must clear _last_Java_sp before copying the rest of the new data |
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// |
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// Hack Alert: Temporary bugfix for 4717480/4721647 |
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// To act like previous version (pd_cache_state) don't NULL _last_Java_sp |
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// unless the value is changing |
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// |
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if (_last_Java_sp != src->_last_Java_sp) |
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_last_Java_sp = NULL; |
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_last_Java_fp = src->_last_Java_fp; |
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_last_Java_pc = src->_last_Java_pc; |
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// Must be last so profiler will always see valid frame if has_last_frame() is true |
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_last_Java_sp = src->_last_Java_sp; |
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} |
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// Always walkable |
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bool walkable(void) { return true; } |
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// Never any thing to do since we are always walkable and can find address of return addresses |
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void make_walkable(JavaThread* thread) { } |
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intptr_t* last_Java_sp(void) const { return _last_Java_sp; } |
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address last_Java_pc(void) { return _last_Java_pc; } |
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private: |
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static ByteSize last_Java_fp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); } |
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public: |
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void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; } |
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intptr_t* last_Java_fp(void) { return _last_Java_fp; } |
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// Assert (last_Java_sp == NULL || fp == NULL) |
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void set_last_Java_fp(intptr_t* fp) { _last_Java_fp = fp; } |
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#endif // CPU_X86_VM_JAVAFRAMEANCHOR_X86_HPP |