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1 /*
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2 * Copyright 2002-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 private:
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26
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27 // FP value associated with _last_Java_sp:
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28 intptr_t* volatile _last_Java_fp; // pointer is volatile not what it points to
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29
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30 public:
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31 // Each arch must define reset, save, restore
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32 // These are used by objects that only care about:
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33 // 1 - initializing a new state (thread creation, javaCalls)
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34 // 2 - saving a current state (javaCalls)
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35 // 3 - restoring an old state (javaCalls)
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36
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37 void clear(void) {
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38 // clearing _last_Java_sp must be first
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39 _last_Java_sp = NULL;
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40 // fence?
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41 _last_Java_fp = NULL;
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42 _last_Java_pc = NULL;
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43 }
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44
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45 void copy(JavaFrameAnchor* src) {
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46 // In order to make sure the transition state is valid for "this"
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47 // We must clear _last_Java_sp before copying the rest of the new data
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48 //
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49 // Hack Alert: Temporary bugfix for 4717480/4721647
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50 // To act like previous version (pd_cache_state) don't NULL _last_Java_sp
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51 // unless the value is changing
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52 //
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53 if (_last_Java_sp != src->_last_Java_sp)
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54 _last_Java_sp = NULL;
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55
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56 _last_Java_fp = src->_last_Java_fp;
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57 _last_Java_pc = src->_last_Java_pc;
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58 // Must be last so profiler will always see valid frame if has_last_frame() is true
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59 _last_Java_sp = src->_last_Java_sp;
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60 }
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61
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62 // Always walkable
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63 bool walkable(void) { return true; }
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64 // Never any thing to do since we are always walkable and can find address of return addresses
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65 void make_walkable(JavaThread* thread) { }
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66
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67 intptr_t* last_Java_sp(void) const { return _last_Java_sp; }
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68
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69 private:
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70
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71 static ByteSize last_Java_fp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); }
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72
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73 public:
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74
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75 void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; }
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76
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77 intptr_t* last_Java_fp(void) { return _last_Java_fp; }
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78 // Assert (last_Java_sp == NULL || fp == NULL)
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79 void set_last_Java_fp(intptr_t* fp) { _last_Java_fp = fp; }
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