jdk8-mips64-public/hotspot: src/os_cpu/linux_sparc/vm/thread_linux

6953477: Increase portability and flexibility of building Hotspot
Summary: A collection of portability improvements including shared code support for PPC, ARM platforms, software floating point, cross compilation support and improvements in error crash detail.
Reviewed-by: phh, never, coleenp, dholmes

     1 /*

     2  * Copyright (c) 2003, 2008, 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  */

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_thread_linux_sparc.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,

    32                                                      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 (!isInJava) {

    39     // make_walkable flushes register windows and grabs last_Java_pc

    40     // which can not be done if the ucontext sp matches last_Java_sp

    41     // stack walking utilities assume last_Java_pc set if marked flushed

    42     jt->frame_anchor()->make_walkable(jt);

    43   }

    45   // If we have a walkable last_Java_frame, then we should use it

    46   // even if isInJava == true. It should be more reliable than

    47   // ucontext info.

    48   if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {

    49     *fr_addr = jt->pd_last_frame();

    50     return true;

    51   }

    53   ucontext_t* uc = (ucontext_t*) ucontext;

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

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

    57   intptr_t* ret_sp;

    58   ExtendedPC addr =

    59     os::fetch_frame_from_context(uc, &ret_sp,

    60                                  NULL /* ret_fp only used on X86 */);

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

    62     // ucontext wasn't useful

    63     return false;

    64   }

    66   // we were running Java code when SIGPROF came in

    67   if (isInJava) {

    68     // If we have a last_Java_sp, then the SIGPROF signal caught us

    69     // right when we were transitioning from _thread_in_Java to a new

    70     // JavaThreadState. We use last_Java_sp instead of the sp from

    71     // the ucontext since it should be more reliable.

    72     if (jt->has_last_Java_frame()) {

    73       ret_sp = jt->last_Java_sp();

    74     }

    75     // Implied else: we don't have a last_Java_sp so we use what we

    76     // got from the ucontext.

    78     frame ret_frame(ret_sp, frame::unpatchable, addr.pc());

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

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

    81       return false;

    82     }

    83     *fr_addr = ret_frame;

    84     return true;

    85   }

    87   // At this point, we know we weren't running Java code. We might

    88   // have a last_Java_sp, but we don't have a walkable frame.

    89   // However, we might still be able to construct something useful

    90   // if the thread was running native code.

    91   if (jt->has_last_Java_frame()) {

    92     assert(!jt->frame_anchor()->walkable(), "case covered above");

    94     if (jt->thread_state() == _thread_in_native) {

    95       frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc());

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

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

    98         return false;

    99       }

   100       *fr_addr = ret_frame;

   101       return true;

   102     }

   103   }

   105   // nothing else to try

   106   return false;

   107 }

   109 void JavaThread::cache_global_variables() { }

src/os_cpu/linux_sparc/vm/thread_linux_sparc.cpp@126ea7725993

src/os_cpu/linux_sparc/vm/thread_linux_sparc.cpp

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

src/os_cpu/linux_sparc/vm/thread_linux_sparc.cpp@126ea7725993

src/os_cpu/linux_sparc/vm/thread_linux_sparc.cpp