1 /*

     2  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 #include "precompiled.hpp"

    26 #include "runtime/frame.inline.hpp"

    27 #include "thread_bsd.inline.hpp"

    28 

    29 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is

    30 // currently interrupted by SIGPROF

    31 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,

    32   void* ucontext, bool isInJava) {

    33 

    34   assert(Thread::current() == this, "caller must be current thread");

    35   assert(this->is_Java_thread(), "must be JavaThread");

    36 

    37   JavaThread* jt = (JavaThread *)this;

    38 

    39   // If we have a last_Java_frame, then we should use it even if

    40   // isInJava == true.  It should be more reliable than ucontext info.

    41   if (jt->has_last_Java_frame()) {

    42     *fr_addr = jt->pd_last_frame();

    43     return true;

    44   }

    45 

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

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

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

    49   if (isInJava) {

    50     ucontext_t* uc = (ucontext_t*) ucontext;

    51 

    52     intptr_t* ret_fp;

    53     intptr_t* ret_sp;

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

    55       &ret_sp, &ret_fp);

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

    57       // ucontext wasn't useful

    58       return false;

    59     }

    60 

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

    62     if (!ret_frame.safe_for_sender(jt)) {

    63 #ifdef COMPILER2

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

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

    66       if (!ret_frame2.safe_for_sender(jt)) {

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

    68         return false;

    69       }

    70       ret_frame = ret_frame2;

    71 #else

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

    73       return false;

    74 #endif /* COMPILER2 */

    75     }

    76     *fr_addr = ret_frame;

    77     return true;

    78   }

    79 

    80   // nothing else to try

    81   return false;

    82 }

    83 

    84 void JavaThread::cache_global_variables() { }