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1 /*
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2 * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * Copyright 2007, 2008, 2010 Red Hat, Inc.
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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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
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22 * have any questions.
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23 *
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24 */
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25
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26 private:
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27 ZeroFrame* volatile _last_Java_fp;
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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 // Note that whenever _last_Java_sp != NULL other anchor fields
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36 // must be valid. The profiler apparently depends on this.
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37
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38 void clear() {
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39 // clearing _last_Java_sp must be first
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40 _last_Java_sp = NULL;
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41 // fence?
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42 _last_Java_fp = NULL;
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43 _last_Java_pc = NULL;
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44 }
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45
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46 void copy(JavaFrameAnchor* src) {
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47 set(src->_last_Java_sp, src->_last_Java_pc, src->_last_Java_fp);
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48 }
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49
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50 void set(intptr_t* sp, address pc, ZeroFrame* fp) {
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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
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53 // data
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54 //
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55 // Hack Alert: Temporary bugfix for 4717480/4721647 To act like
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56 // previous version (pd_cache_state) don't NULL _last_Java_sp
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57 // unless the value is changing
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58 //
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59 if (_last_Java_sp != sp)
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60 _last_Java_sp = NULL;
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61
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62 _last_Java_fp = fp;
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63 _last_Java_pc = pc;
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64 // Must be last so profiler will always see valid frame if
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65 // has_last_frame() is true
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66 _last_Java_sp = sp;
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67 }
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68
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69 bool walkable() {
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70 return true;
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71 }
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72
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73 void make_walkable(JavaThread* thread) {
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74 // nothing to do
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75 }
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76
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77 intptr_t* last_Java_sp() const {
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78 return _last_Java_sp;
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79 }
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80
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81 ZeroFrame* last_Java_fp() const {
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82 return _last_Java_fp;
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83 }
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84
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85 static ByteSize last_Java_fp_offset() {
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86 return byte_offset_of(JavaFrameAnchor, _last_Java_fp);
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87 }
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