jdk8-mips64-public/hotspot: src/os_cpu/solaris_sparc/vm/thread_solaris

src/os_cpu/solaris_sparc/vm/thread_solaris_sparc.cpp@1e9a9d2e6509 (annotated)

src/os_cpu/solaris_sparc/vm/thread_solaris_sparc.cpp

Thu, 21 Oct 2010 11:55:10 -0700

author: never
date: Thu, 21 Oct 2010 11:55:10 -0700
changeset 2262: 1e9a9d2e6509
parent 2036: 126ea7725993
child 2314: f95d63e2154a
permissions: -rw-r--r--

6970683: improvements to hs_err output
Reviewed-by: kvn, jrose, dholmes, coleenp

 /*
  * Copyright (c) 2003, 2008, 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 "incls/_precompiled.incl"
 #include "incls/_thread_solaris_sparc.cpp.incl"
 // 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");
   assert(this->is_Java_thread(), "must be JavaThread");
   JavaThread* jt = (JavaThread *)this;
   if (!isInJava) {
     // 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() { }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/os_cpu/solaris_sparc/vm/thread_solaris_sparc.cpp@1e9a9d2e6509 (annotated)

src/os_cpu/solaris_sparc/vm/thread_solaris_sparc.cpp