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3960
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1 /*
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2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "runtime/frame.inline.hpp"
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27 #include "thread_bsd.inline.hpp"
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28
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29 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is
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30 // currently interrupted by SIGPROF
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31 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
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32 void* ucontext, bool isInJava) {
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33
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34 assert(Thread::current() == this, "caller must be current thread");
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35 assert(this->is_Java_thread(), "must be JavaThread");
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36
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37 JavaThread* jt = (JavaThread *)this;
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38
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39 // If we have a last_Java_frame, then we should use it even if
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40 // isInJava == true. It should be more reliable than ucontext info.
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41 if (jt->has_last_Java_frame()) {
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42 *fr_addr = jt->pd_last_frame();
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43 return true;
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44 }
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45
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46 // At this point, we don't have a last_Java_frame, so
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47 // we try to glean some information out of the ucontext
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48 // if we were running Java code when SIGPROF came in.
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49 if (isInJava) {
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50 ucontext_t* uc = (ucontext_t*) ucontext;
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51
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52 intptr_t* ret_fp;
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53 intptr_t* ret_sp;
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54 ExtendedPC addr = os::Bsd::fetch_frame_from_ucontext(this, uc,
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55 &ret_sp, &ret_fp);
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56 if (addr.pc() == NULL || ret_sp == NULL ) {
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57 // ucontext wasn't useful
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58 return false;
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59 }
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60
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61 frame ret_frame(ret_sp, ret_fp, addr.pc());
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62 if (!ret_frame.safe_for_sender(jt)) {
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63 #ifdef COMPILER2
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64 // C2 uses ebp as a general register see if NULL fp helps
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65 frame ret_frame2(ret_sp, NULL, addr.pc());
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66 if (!ret_frame2.safe_for_sender(jt)) {
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67 // nothing else to try if the frame isn't good
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68 return false;
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69 }
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70 ret_frame = ret_frame2;
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71 #else
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72 // nothing else to try if the frame isn't good
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73 return false;
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74 #endif /* COMPILER2 */
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75 }
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76 *fr_addr = ret_frame;
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77 return true;
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78 }
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79
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80 // nothing else to try
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81 return false;
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82 }
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83
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84 void JavaThread::cache_global_variables() { }
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