--- old/src/hotspot/os_cpu/solaris_sparc/thread_solaris_sparc.cpp 2020-05-01 02:29:57.068680341 -0700 +++ /dev/null 2020-03-09 18:57:19.455001459 -0700 @@ -1,171 +0,0 @@ -/* - * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved. - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This code is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 only, as - * published by the Free Software Foundation. - * - * This code is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * version 2 for more details (a copy is included in the LICENSE file that - * accompanied this code). - * - * You should have received a copy of the GNU General Public License version - * 2 along with this work; if not, write to the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - * - */ - -#include "precompiled.hpp" -#include "memory/metaspaceShared.hpp" -#include "runtime/frame.inline.hpp" -#include "runtime/thread.inline.hpp" - -frame JavaThread::pd_last_frame() { - assert(has_last_Java_frame(), "must have last_Java_sp() when suspended"); - assert(_anchor.walkable(), "thread has not dumped its register windows yet"); - - assert(_anchor.last_Java_pc() != NULL, "Ack no pc!"); - return frame(last_Java_sp(), frame::unpatchable, _anchor.last_Java_pc()); -} - -// For Forte Analyzer AsyncGetCallTrace profiling support - thread is -// currently interrupted by SIGPROF -// -// NOTE: On Solaris, register windows are flushed in the signal handler -// except for possibly the top frame. -// -bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, - void* ucontext, bool isInJava) { - - assert(Thread::current() == this, "caller must be current thread"); - return pd_get_top_frame(fr_addr, ucontext, isInJava, true); -} - -bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) { - // get ucontext somehow - return pd_get_top_frame(fr_addr, ucontext, isInJava, false); -} - -bool JavaThread::pd_get_top_frame(frame* fr_addr, - void* ucontext, bool isInJava, bool makeWalkable) { - assert(this->is_Java_thread(), "must be JavaThread"); - - JavaThread* jt = (JavaThread *)this; - - if (!isInJava && makeWalkable) { - // make_walkable flushes register windows and grabs last_Java_pc - // which can not be done if the ucontext sp matches last_Java_sp - // stack walking utilities assume last_Java_pc set if marked flushed - jt->frame_anchor()->make_walkable(jt); - } - - // If we have a walkable last_Java_frame, then we should use it - // even if isInJava == true. It should be more reliable than - // ucontext info. - if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { - *fr_addr = jt->pd_last_frame(); - return true; - } - - ucontext_t* uc = (ucontext_t*) ucontext; - - // At this point, we don't have a walkable last_Java_frame, so - // we try to glean some information out of the ucontext. - intptr_t* ret_sp; - ExtendedPC addr = os::Solaris::fetch_frame_from_ucontext(this, uc, - &ret_sp, NULL /* ret_fp only used on Solaris X86 */); - if (addr.pc() == NULL || ret_sp == NULL) { - // ucontext wasn't useful - return false; - } - - if (MetaspaceShared::is_in_trampoline_frame(addr.pc())) { - // In the middle of a trampoline call. Bail out for safety. - // This happens rarely so shouldn't affect profiling. - return false; - } - - frame ret_frame(ret_sp, frame::unpatchable, addr.pc()); - - // we were running Java code when SIGPROF came in - if (isInJava) { - - - // If the frame we got is safe then it is most certainly valid - if (ret_frame.safe_for_sender(jt)) { - *fr_addr = ret_frame; - return true; - } - - // If it isn't safe then we can try several things to try and get - // a good starting point. - // - // On sparc the frames are almost certainly walkable in the sense - // of sp/fp linkages. However because of recycling of windows if - // a piece of code does multiple save's where the initial save creates - // a real frame with a return pc and the succeeding save's are used to - // simply get free registers and have no real pc then the pc linkage on these - // "inner" temporary frames will be bogus. - // Since there is in general only a nesting level like - // this one deep in general we'll try and unwind such an "inner" frame - // here ourselves and see if it makes sense - - frame unwind_frame(ret_frame.fp(), frame::unpatchable, addr.pc()); - - if (unwind_frame.safe_for_sender(jt)) { - *fr_addr = unwind_frame; - return true; - } - - // Well that didn't work. Most likely we're toast on this tick - // The previous code would try this. I think it is dubious in light - // of changes to safe_for_sender and the unwind trick above but - // if it gets us a safe frame who wants to argue. - - // If we have a last_Java_sp, then the SIGPROF signal caught us - // right when we were transitioning from _thread_in_Java to a new - // JavaThreadState. We use last_Java_sp instead of the sp from - // the ucontext since it should be more reliable. - - if (jt->has_last_Java_frame()) { - ret_sp = jt->last_Java_sp(); - frame ret_frame2(ret_sp, frame::unpatchable, addr.pc()); - if (ret_frame2.safe_for_sender(jt)) { - *fr_addr = ret_frame2; - return true; - } - } - - // This is the best we can do. We will only be able to decode the top frame - - *fr_addr = ret_frame; - return true; - } - - // At this point, we know we weren't running Java code. We might - // have a last_Java_sp, but we don't have a walkable frame. - // However, we might still be able to construct something useful - // if the thread was running native code. - if (jt->has_last_Java_frame()) { - assert(!jt->frame_anchor()->walkable(), "case covered above"); - - frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc()); - *fr_addr = ret_frame; - return true; - } - - // nothing else to try but what we found initially - - *fr_addr = ret_frame; - return true; -} - -void JavaThread::cache_global_variables() { } -