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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 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 public: |
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27 // Each arch must define reset, save, restore |
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28 // These are used by objects that only care about: |
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29 // 1 - initializing a new state (thread creation, javaCalls) |
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30 // 2 - saving a current state (javaCalls) |
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31 // 3 - restoring an old state (javaCalls) |
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32 |
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33 void clear() { |
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34 // clearing _last_Java_sp must be first |
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35 _last_Java_sp = NULL; |
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36 // fence? |
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37 _last_Java_pc = NULL; |
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38 } |
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39 |
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40 void copy(JavaFrameAnchor* src) { |
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41 // In order to make sure the transition state is valid for "this" |
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42 // We must clear _last_Java_sp before copying the rest of the new |
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43 // data |
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44 // |
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45 // Hack Alert: Temporary bugfix for 4717480/4721647 To act like |
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46 // previous version (pd_cache_state) don't NULL _last_Java_sp |
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47 // unless the value is changing |
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48 // |
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49 if (_last_Java_sp != src->_last_Java_sp) |
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50 _last_Java_sp = NULL; |
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51 |
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52 _last_Java_pc = src->_last_Java_pc; |
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53 // Must be last so profiler will always see valid frame if |
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54 // has_last_frame() is true |
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55 _last_Java_sp = src->_last_Java_sp; |
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56 } |
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57 |
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58 bool walkable() { |
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59 return true; |
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60 } |
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61 |
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62 void make_walkable(JavaThread* thread) { |
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63 // nothing to do |
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64 } |
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65 |
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66 intptr_t* last_Java_sp() const { |
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67 return _last_Java_sp; |
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68 } |
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69 |
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70 void set_last_Java_sp(intptr_t* sp) { |
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71 _last_Java_sp = sp; |
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72 } |