author | msheppar |
Fri, 16 Jun 2017 20:37:39 +0100 | |
changeset 45667 | b0d80f360c3d |
parent 37439 | e8970711113b |
child 46746 | ea379ebb9447 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "memory/metaspaceShared.hpp" |
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#include "runtime/frame.inline.hpp" |
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#include "runtime/thread.inline.hpp" |
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// For Forte Analyzer AsyncGetCallTrace profiling support - thread is |
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// currently interrupted by SIGPROF |
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bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, |
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void* ucontext, |
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bool isInJava) { |
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assert(Thread::current() == this, "caller must be current thread"); |
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assert(this->is_Java_thread(), "must be JavaThread"); |
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JavaThread* jt = (JavaThread *)this; |
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if (!isInJava) { |
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// make_walkable flushes register windows and grabs last_Java_pc |
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// which can not be done if the ucontext sp matches last_Java_sp |
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// stack walking utilities assume last_Java_pc set if marked flushed |
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jt->frame_anchor()->make_walkable(jt); |
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} |
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// If we have a walkable last_Java_frame, then we should use it |
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// even if isInJava == true. It should be more reliable than |
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// ucontext info. |
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if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { |
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*fr_addr = jt->pd_last_frame(); |
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return true; |
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} |
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ucontext_t* uc = (ucontext_t*) ucontext; |
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// At this point, we don't have a walkable last_Java_frame, so |
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// we try to glean some information out of the ucontext. |
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intptr_t* ret_sp; |
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ExtendedPC addr = |
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os::fetch_frame_from_context(uc, &ret_sp, |
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NULL /* ret_fp only used on X86 */); |
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if (addr.pc() == NULL || ret_sp == NULL) { |
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// ucontext wasn't useful |
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return false; |
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} |
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#if INCLUDE_CDS |
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if (UseSharedSpaces && MetaspaceShared::is_in_shared_region(addr.pc(), MetaspaceShared::md)) { |
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// In the middle of a trampoline call. Bail out for safety. |
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// This happens rarely so shouldn't affect profiling. |
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return false; |
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} |
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#endif |
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// we were running Java code when SIGPROF came in |
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if (isInJava) { |
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// If we have a last_Java_sp, then the SIGPROF signal caught us |
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// right when we were transitioning from _thread_in_Java to a new |
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// JavaThreadState. We use last_Java_sp instead of the sp from |
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// the ucontext since it should be more reliable. |
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if (jt->has_last_Java_frame()) { |
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ret_sp = jt->last_Java_sp(); |
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} |
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// Implied else: we don't have a last_Java_sp so we use what we |
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// got from the ucontext. |
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frame ret_frame(ret_sp, frame::unpatchable, addr.pc()); |
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if (!ret_frame.safe_for_sender(jt)) { |
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// nothing else to try if the frame isn't good |
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return false; |
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} |
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*fr_addr = ret_frame; |
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return true; |
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} |
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// At this point, we know we weren't running Java code. We might |
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// have a last_Java_sp, but we don't have a walkable frame. |
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// However, we might still be able to construct something useful |
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// if the thread was running native code. |
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if (jt->has_last_Java_frame()) { |
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assert(!jt->frame_anchor()->walkable(), "case covered above"); |
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if (jt->thread_state() == _thread_in_native) { |
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frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc()); |
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if (!ret_frame.safe_for_sender(jt)) { |
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// nothing else to try if the frame isn't good |
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return false; |
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} |
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*fr_addr = ret_frame; |
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return true; |
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} |
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} |
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// nothing else to try |
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return false; |
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} |
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void JavaThread::cache_global_variables() { } |
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