Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/os_cpu/linux_sparc/vm/thread_linux_sparc.cpp
src/os_cpu/linux_sparc/vm/thread_linux_sparc.cpp
- changeset 568
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- child 631
- d1605aabd0a1
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| 1 /* | |
| 2 * Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_thread_linux_sparc.cpp.incl" | |
| 27 | |
| 28 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is | |
| 29 // currently interrupted by SIGPROF | |
| 30 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, | |
| 31 void* ucontext, | |
| 32 bool isInJava) { | |
| 33 assert(Thread::current() == this, "caller must be current thread"); | |
| 34 assert(this->is_Java_thread(), "must be JavaThread"); | |
| 35 | |
| 36 JavaThread* jt = (JavaThread *)this; | |
| 37 | |
| 38 if (!isInJava) { | |
| 39 // make_walkable flushes register windows and grabs last_Java_pc | |
| 40 // which can not be done if the ucontext sp matches last_Java_sp | |
| 41 // stack walking utilities assume last_Java_pc set if marked flushed | |
| 42 jt->frame_anchor()->make_walkable(jt); | |
| 43 } | |
| 44 | |
| 45 // If we have a walkable last_Java_frame, then we should use it | |
| 46 // even if isInJava == true. It should be more reliable than | |
| 47 // ucontext info. | |
| 48 if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { | |
| 49 *fr_addr = jt->pd_last_frame(); | |
| 50 return true; | |
| 51 } | |
| 52 | |
| 53 ucontext_t* uc = (ucontext_t*) ucontext; | |
| 54 | |
| 55 // At this point, we don't have a walkable last_Java_frame, so | |
| 56 // we try to glean some information out of the ucontext. | |
| 57 intptr_t* ret_sp; | |
| 58 ExtendedPC addr = | |
| 59 os::fetch_frame_from_context(uc, &ret_sp, | |
| 60 NULL /* ret_fp only used on X86 */); | |
| 61 if (addr.pc() == NULL || ret_sp == NULL) { | |
| 62 // ucontext wasn't useful | |
| 63 return false; | |
| 64 } | |
| 65 | |
| 66 // we were running Java code when SIGPROF came in | |
| 67 if (isInJava) { | |
| 68 // If we have a last_Java_sp, then the SIGPROF signal caught us | |
| 69 // right when we were transitioning from _thread_in_Java to a new | |
| 70 // JavaThreadState. We use last_Java_sp instead of the sp from | |
| 71 // the ucontext since it should be more reliable. | |
| 72 if (jt->has_last_Java_frame()) { | |
| 73 ret_sp = jt->last_Java_sp(); | |
| 74 } | |
| 75 // Implied else: we don't have a last_Java_sp so we use what we | |
| 76 // got from the ucontext. | |
| 77 | |
| 78 frame ret_frame(ret_sp, frame::unpatchable, addr.pc()); | |
| 79 if (!ret_frame.safe_for_sender(jt)) { | |
| 80 // nothing else to try if the frame isn't good | |
| 81 return false; | |
| 82 } | |
| 83 *fr_addr = ret_frame; | |
| 84 return true; | |
| 85 } | |
| 86 | |
| 87 // At this point, we know we weren't running Java code. We might | |
| 88 // have a last_Java_sp, but we don't have a walkable frame. | |
| 89 // However, we might still be able to construct something useful | |
| 90 // if the thread was running native code. | |
| 91 if (jt->has_last_Java_frame()) { | |
| 92 assert(!jt->frame_anchor()->walkable(), "case covered above"); | |
| 93 | |
| 94 if (jt->thread_state() == _thread_in_native) { | |
| 95 frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc()); | |
| 96 if (!ret_frame.safe_for_sender(jt)) { | |
| 97 // nothing else to try if the frame isn't good | |
| 98 return false; | |
| 99 } | |
| 100 *fr_addr = ret_frame; | |
| 101 return true; | |
| 102 } | |
| 103 } | |
| 104 | |
| 105 // nothing else to try | |
| 106 return false; | |
| 107 } |
