Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2003, 2010, 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 "thread_bsd.inline.hpp"

 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is

 // currently interrupted by SIGPROF

 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 we have a 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()) {

     *fr_addr = jt->pd_last_frame();

     return true;

   }

   // At this point, we don't have a last_Java_frame, so

   // we try to glean some information out of the ucontext

   // if we were running Java code when SIGPROF came in.

   if (isInJava) {

     ucontext_t* uc = (ucontext_t*) ucontext;

     intptr_t* ret_fp;

     intptr_t* ret_sp;

     ExtendedPC addr = os::Bsd::fetch_frame_from_ucontext(this, uc,

       &ret_sp, &ret_fp);

     if (addr.pc() == NULL || ret_sp == NULL ) {

       // ucontext wasn't useful

       return false;

     }

     frame ret_frame(ret_sp, ret_fp, addr.pc());

     if (!ret_frame.safe_for_sender(jt)) {

 #ifdef COMPILER2

       // C2 uses ebp as a general register see if NULL fp helps

       frame ret_frame2(ret_sp, NULL, addr.pc());

       if (!ret_frame2.safe_for_sender(jt)) {

         // nothing else to try if the frame isn't good

         return false;

       }

       ret_frame = ret_frame2;

 #else

       // nothing else to try if the frame isn't good

       return false;

 #endif /* COMPILER2 */

     }

     *fr_addr = ret_frame;

     return true;

   }

   // nothing else to try

   return false;

 }

 void JavaThread::cache_global_variables() { }