jdk8-mips64-public/hotspot: src/os_cpu/windows_x86/vm/thread_windows

6822204: volatile fences should prefer lock:addl to actual mfence instructions
Reviewed-by: kvn, phh

     1 /*

     2  * Copyright 2003-2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_thread_windows_x86.cpp.incl"

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

    29 // currently interrupted by SIGPROF

    30 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,

    31   void* ucontext, bool isInJava) {

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

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

    36   JavaThread* jt = (JavaThread *)this;

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

    39   // isInJava == true.  It should be more reliable than CONTEXT info.

    40   if (jt->has_last_Java_frame()) {

    41     *fr_addr = jt->pd_last_frame();

    42     return true;

    43   }

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

    46   // we try to glean some information out of the CONTEXT

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

    48   if (isInJava) {

    49     CONTEXT* uc = (CONTEXT*)ucontext;

    51 #ifdef AMD64

    52     intptr_t* ret_fp = (intptr_t*) uc->Rbp;

    53     intptr_t* ret_sp = (intptr_t*) uc->Rsp;

    54     ExtendedPC addr = ExtendedPC((address)uc->Rip);

    55 #else

    56     intptr_t* ret_fp = (intptr_t*) uc->Ebp;

    57     intptr_t* ret_sp = (intptr_t*) uc->Esp;

    58     ExtendedPC addr = ExtendedPC((address)uc->Eip);

    59 #endif // AMD64

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

    61       // CONTEXT wasn't useful

    62       return false;

    63     }

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

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

    67 #ifdef COMPILER2

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

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

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

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

    72         return false;

    73       }

    74       ret_frame = ret_frame2;

    75 #else

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

    77       return false;

    78 #endif /* COMPILER2 */

    79     }

    80     *fr_addr = ret_frame;

    81     return true;

    82   }

    84   // nothing else to try

    85   return false;

    86 }

src/os_cpu/windows_x86/vm/thread_windows_x86.cpp@d0994e5bebce