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

 /*

  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.

  * Copyright 2012, 2014 SAP AG. 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.hpp"

 bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {

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

   // 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 (has_last_Java_frame() && frame_anchor()->walkable()) {

     *fr_addr = 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;

     frame ret_frame((intptr_t*)uc->uc_mcontext.regs->gpr[1/*REG_SP*/],

                      (address)uc->uc_mcontext.regs->nip);

     if (ret_frame.pc() == NULL) {

       // ucontext wasn't useful

       return false;

     }

     if (ret_frame.is_interpreted_frame()) {

        frame::ijava_state* istate = ret_frame.get_ijava_state();

        if (!((Method*)(istate->method))->is_metaspace_object()) {

          return false;

        }

        uint64_t reg_bcp = uc->uc_mcontext.regs->gpr[14/*R14_bcp*/];

        uint64_t istate_bcp = istate->bcp;

        uint64_t code_start = (uint64_t)(((Method*)(istate->method))->code_base());

        uint64_t code_end = (uint64_t)(((Method*)istate->method)->code_base() + ((Method*)istate->method)->code_size());

        if (istate_bcp >= code_start && istate_bcp < code_end) {

          // we have a valid bcp, don't touch it, do nothing

        } else if (reg_bcp >= code_start && reg_bcp < code_end) {

          istate->bcp = reg_bcp;

       } else {

          return false;

        }

     }

     if (!ret_frame.safe_for_sender(this)) {

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

       return false;

     }

     *fr_addr = ret_frame;

     return true;

   }

   // nothing else to try

   return false;

 }

 // Forte Analyzer AsyncGetCallTrace profiling support is not implemented on Linux/PPC.

 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, bool isInJava) {

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

   return pd_get_top_frame_for_profiling(fr_addr, ucontext, isInJava);

 }

 void JavaThread::cache_global_variables() { }