mirror of
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116 lines
3.9 KiB
C++
116 lines
3.9 KiB
C++
/*
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* Copyright (c) 2008, 2025, 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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#include "gc/shared/barrierSet.hpp"
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#include "gc/shared/cardTable.hpp"
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#include "gc/shared/cardTableBarrierSet.inline.hpp"
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#include "gc/shared/collectedHeap.hpp"
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#include "memory/universe.hpp"
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#include "runtime/frame.inline.hpp"
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frame JavaThread::pd_last_frame() {
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assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
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if (_anchor.last_Java_pc() != nullptr) {
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return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp(), _anchor.last_Java_pc());
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} else {
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// This will pick up pc from sp
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return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp());
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}
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}
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void JavaThread::cache_global_variables() {
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BarrierSet* bs = BarrierSet::barrier_set();
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if (bs->is_a(BarrierSet::CardTableBarrierSet)) {
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CardTableBarrierSet* ctbs = CardTableBarrierSet::barrier_set();
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_card_table_base = (address)ctbs->card_table_base_const();
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} else {
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_card_table_base = nullptr;
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}
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}
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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, bool isInJava) {
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assert(Thread::current() == this, "caller must be current thread");
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return pd_get_top_frame(fr_addr, ucontext, isInJava);
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}
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bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
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return pd_get_top_frame(fr_addr, ucontext, isInJava);
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}
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bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava) {
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// If we have a last_Java_frame, then we should use it even if
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// isInJava == true. It should be more reliable than ucontext info.
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if (has_last_Java_frame()) {
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*fr_addr = pd_last_frame();
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return true;
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}
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// Could be in a code section that plays with the stack, like
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// MacroAssembler::verify_heapbase()
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if (in_top_frame_unsafe_section()) {
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return false;
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}
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// At this point, we don't have a last_Java_frame, so
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// we try to glean some information out of the ucontext
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// if we were running Java code when SIGPROF came in.
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if (isInJava) {
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ucontext_t* uc = (ucontext_t*) ucontext;
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intptr_t* ret_fp;
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intptr_t* ret_sp;
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address addr = os::fetch_frame_from_context(uc, &ret_sp, &ret_fp);
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if (addr == nullptr || ret_sp == nullptr ) {
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// ucontext wasn't useful
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return false;
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}
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frame ret_frame(ret_sp, ret_fp, addr);
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if (!ret_frame.safe_for_sender(this)) {
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#ifdef COMPILER2
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// C2 uses ebp as a general register see if null fp helps
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frame ret_frame2(ret_sp, nullptr, addr);
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if (!ret_frame2.safe_for_sender(this)) {
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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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ret_frame = ret_frame2;
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#else
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// nothing else to try if the frame isn't good
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return false;
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#endif /* COMPILER2 */
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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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// nothing else to try
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return false;
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}
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