1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/os_cpu/solaris_sparc/vm/thread_solaris_sparc.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,156 @@
1.4 +/*
1.5 + * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "runtime/frame.inline.hpp"
1.30 +#include "runtime/thread.inline.hpp"
1.31 +
1.32 +// For Forte Analyzer AsyncGetCallTrace profiling support - thread is
1.33 +// currently interrupted by SIGPROF
1.34 +//
1.35 +// NOTE: On Solaris, register windows are flushed in the signal handler
1.36 +// except for possibly the top frame.
1.37 +//
1.38 +bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
1.39 + void* ucontext, bool isInJava) {
1.40 +
1.41 + assert(Thread::current() == this, "caller must be current thread");
1.42 + return pd_get_top_frame(fr_addr, ucontext, isInJava, true);
1.43 +}
1.44 +
1.45 +bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
1.46 + // get ucontext somehow
1.47 + return pd_get_top_frame(fr_addr, ucontext, isInJava, false);
1.48 +}
1.49 +
1.50 +bool JavaThread::pd_get_top_frame(frame* fr_addr,
1.51 + void* ucontext, bool isInJava, bool makeWalkable) {
1.52 + assert(this->is_Java_thread(), "must be JavaThread");
1.53 +
1.54 + JavaThread* jt = (JavaThread *)this;
1.55 +
1.56 + if (!isInJava && makeWalkable) {
1.57 + // make_walkable flushes register windows and grabs last_Java_pc
1.58 + // which can not be done if the ucontext sp matches last_Java_sp
1.59 + // stack walking utilities assume last_Java_pc set if marked flushed
1.60 + jt->frame_anchor()->make_walkable(jt);
1.61 + }
1.62 +
1.63 + // If we have a walkable last_Java_frame, then we should use it
1.64 + // even if isInJava == true. It should be more reliable than
1.65 + // ucontext info.
1.66 + if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {
1.67 + *fr_addr = jt->pd_last_frame();
1.68 + return true;
1.69 + }
1.70 +
1.71 + ucontext_t* uc = (ucontext_t*) ucontext;
1.72 +
1.73 + // At this point, we don't have a walkable last_Java_frame, so
1.74 + // we try to glean some information out of the ucontext.
1.75 + intptr_t* ret_sp;
1.76 + ExtendedPC addr = os::Solaris::fetch_frame_from_ucontext(this, uc,
1.77 + &ret_sp, NULL /* ret_fp only used on Solaris X86 */);
1.78 + if (addr.pc() == NULL || ret_sp == NULL) {
1.79 + // ucontext wasn't useful
1.80 + return false;
1.81 + }
1.82 +
1.83 + frame ret_frame(ret_sp, frame::unpatchable, addr.pc());
1.84 +
1.85 + // we were running Java code when SIGPROF came in
1.86 + if (isInJava) {
1.87 +
1.88 +
1.89 + // If the frame we got is safe then it is most certainly valid
1.90 + if (ret_frame.safe_for_sender(jt)) {
1.91 + *fr_addr = ret_frame;
1.92 + return true;
1.93 + }
1.94 +
1.95 + // If it isn't safe then we can try several things to try and get
1.96 + // a good starting point.
1.97 + //
1.98 + // On sparc the frames are almost certainly walkable in the sense
1.99 + // of sp/fp linkages. However because of recycling of windows if
1.100 + // a piece of code does multiple save's where the initial save creates
1.101 + // a real frame with a return pc and the succeeding save's are used to
1.102 + // simply get free registers and have no real pc then the pc linkage on these
1.103 + // "inner" temporary frames will be bogus.
1.104 + // Since there is in general only a nesting level like
1.105 + // this one deep in general we'll try and unwind such an "inner" frame
1.106 + // here ourselves and see if it makes sense
1.107 +
1.108 + frame unwind_frame(ret_frame.fp(), frame::unpatchable, addr.pc());
1.109 +
1.110 + if (unwind_frame.safe_for_sender(jt)) {
1.111 + *fr_addr = unwind_frame;
1.112 + return true;
1.113 + }
1.114 +
1.115 + // Well that didn't work. Most likely we're toast on this tick
1.116 + // The previous code would try this. I think it is dubious in light
1.117 + // of changes to safe_for_sender and the unwind trick above but
1.118 + // if it gets us a safe frame who wants to argue.
1.119 +
1.120 + // If we have a last_Java_sp, then the SIGPROF signal caught us
1.121 + // right when we were transitioning from _thread_in_Java to a new
1.122 + // JavaThreadState. We use last_Java_sp instead of the sp from
1.123 + // the ucontext since it should be more reliable.
1.124 +
1.125 + if (jt->has_last_Java_frame()) {
1.126 + ret_sp = jt->last_Java_sp();
1.127 + frame ret_frame2(ret_sp, frame::unpatchable, addr.pc());
1.128 + if (ret_frame2.safe_for_sender(jt)) {
1.129 + *fr_addr = ret_frame2;
1.130 + return true;
1.131 + }
1.132 + }
1.133 +
1.134 + // This is the best we can do. We will only be able to decode the top frame
1.135 +
1.136 + *fr_addr = ret_frame;
1.137 + return true;
1.138 + }
1.139 +
1.140 + // At this point, we know we weren't running Java code. We might
1.141 + // have a last_Java_sp, but we don't have a walkable frame.
1.142 + // However, we might still be able to construct something useful
1.143 + // if the thread was running native code.
1.144 + if (jt->has_last_Java_frame()) {
1.145 + assert(!jt->frame_anchor()->walkable(), "case covered above");
1.146 +
1.147 + frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc());
1.148 + *fr_addr = ret_frame;
1.149 + return true;
1.150 + }
1.151 +
1.152 + // nothing else to try but what we found initially
1.153 +
1.154 + *fr_addr = ret_frame;
1.155 + return true;
1.156 +}
1.157 +
1.158 +void JavaThread::cache_global_variables() { }
1.159 +
