| /* |
| * Copyright (c) 2003, 2013, 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 "runtime/frame.inline.hpp" |
| #include "runtime/thread.inline.hpp" |
| |
| // 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; |
| } |
| |
| 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() { } |
| |