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annotate src/cpu/ppc/vm/javaFrameAnchor_ppc.hpp @ 20304:a22acf6d7598

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8048112: G1 Full GC needs to support the case when the very first region is not available Summary: Refactor preparation for compaction during Full GC so that it lazily initializes the first compaction point. This also avoids problems later when the first region may not be committed. Also reviewed by K. Barrett. Reviewed-by: brutisso
author tschatzl
date Mon, 21 Jul 2014 10:00:31 +0200
parents fd1b9f02cc91
children 92aa6797d639
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1 /*
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2 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * Copyright 2012, 2014 SAP AG. All rights reserved.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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21 * or visit www.oracle.com if you need additional information or have any
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22 * questions.
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23 *
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24 */
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25
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26 #ifndef CPU_PPC_VM_JAVAFRAMEANCHOR_PPC_HPP
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27 #define CPU_PPC_VM_JAVAFRAMEANCHOR_PPC_HPP
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28
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29 public:
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30 // Each arch must define reset, save, restore
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31 // These are used by objects that only care about:
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32 // 1 - initializing a new state (thread creation, javaCalls)
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33 // 2 - saving a current state (javaCalls)
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34 // 3 - restoring an old state (javaCalls)
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35
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36 inline void clear(void) {
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37 // clearing _last_Java_sp must be first
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38 _last_Java_sp = NULL;
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39 // fence?
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40 OrderAccess::release();
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41 _last_Java_pc = NULL;
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42 }
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43
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44 inline void set(intptr_t* sp, address pc) {
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45 _last_Java_pc = pc;
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46 OrderAccess::release();
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47 _last_Java_sp = sp;
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48 }
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49
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50 void copy(JavaFrameAnchor* src) {
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51 // In order to make sure the transition state is valid for "this".
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52 // We must clear _last_Java_sp before copying the rest of the new data.
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53 //
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54 // Hack Alert: Temporary bugfix for 4717480/4721647
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55 // To act like previous version (pd_cache_state) don't NULL _last_Java_sp
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56 // unless the value is changing.
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57 if (_last_Java_sp != src->_last_Java_sp) {
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58 _last_Java_sp = NULL;
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59 OrderAccess::release();
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60 }
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61 _last_Java_pc = src->_last_Java_pc;
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62 // Must be last so profiler will always see valid frame if has_last_frame() is true.
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63 OrderAccess::release();
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64 _last_Java_sp = src->_last_Java_sp;
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65 }
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66
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67 // Always walkable.
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68 bool walkable(void) { return true; }
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69 // Never any thing to do since we are always walkable and can find address of return addresses.
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70 void make_walkable(JavaThread* thread) { }
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71
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72 intptr_t* last_Java_sp(void) const { return _last_Java_sp; }
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73
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74 address last_Java_pc(void) { return _last_Java_pc; }
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75
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76 void set_last_Java_sp(intptr_t* sp) { OrderAccess::release(); _last_Java_sp = sp; }
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77
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78 #endif // CPU_PPC_VM_JAVAFRAMEANCHOR_PPC_HPP