1 /*
   2  * Copyright (c) 2003, 2017, 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 "memory/metaspaceShared.hpp"
  27 #include "runtime/frame.inline.hpp"
  28 #include "runtime/thread.inline.hpp"
  29 
  30 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is
  31 // currently interrupted by SIGPROF
  32 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
  33   void* ucontext, bool isInJava) {
  34 
  35   assert(Thread::current() == this, "caller must be current thread");
  36   return pd_get_top_frame(fr_addr, ucontext, isInJava);
  37 }
  38 
  39 bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
  40   return pd_get_top_frame(fr_addr, ucontext, isInJava);
  41 }
  42 
  43 bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava) {
  44 
  45   assert(this->is_Java_thread(), "must be JavaThread");
  46 
  47   JavaThread* jt = (JavaThread *)this;
  48 
  49   // If we have a last_Java_frame, then we should use it even if
  50   // isInJava == true.  It should be more reliable than CONTEXT info.
  51   if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {
  52     *fr_addr = jt->pd_last_frame();
  53     return true;
  54   }
  55 
  56   // At this point, we don't have a last_Java_frame, so
  57   // we try to glean some information out of the CONTEXT
  58   // if we were running Java code when SIGPROF came in.
  59   if (isInJava) {
  60     CONTEXT* uc = (CONTEXT*)ucontext;
  61 
  62 #ifdef AMD64
  63     intptr_t* ret_fp = (intptr_t*) uc->Rbp;
  64     intptr_t* ret_sp = (intptr_t*) uc->Rsp;
  65     ExtendedPC addr = ExtendedPC((address)uc->Rip);
  66 #else
  67     intptr_t* ret_fp = (intptr_t*) uc->Ebp;
  68     intptr_t* ret_sp = (intptr_t*) uc->Esp;
  69     ExtendedPC addr = ExtendedPC((address)uc->Eip);
  70 #endif // AMD64
  71     if (addr.pc() == NULL || ret_sp == NULL ) {
  72       // CONTEXT wasn't useful
  73       return false;
  74     }
  75 
  76     if (MetaspaceShared::is_in_trampoline_frame(addr.pc())) {
  77       // In the middle of a trampoline call. Bail out for safety.
  78       // This happens rarely so shouldn't affect profiling.
  79       return false;
  80     }
  81 
  82     frame ret_frame(ret_sp, ret_fp, addr.pc());
  83     if (!ret_frame.safe_for_sender(jt)) {
  84 #if defined(COMPILER2) || INCLUDE_JVMCI
  85       // C2 and JVMCI use ebp as a general register see if NULL fp helps
  86       frame ret_frame2(ret_sp, NULL, addr.pc());
  87       if (!ret_frame2.safe_for_sender(jt)) {
  88         // nothing else to try if the frame isn't good
  89         return false;
  90       }
  91       ret_frame = ret_frame2;
  92 #else
  93       // nothing else to try if the frame isn't good
  94       return false;
  95 #endif /* COMPILER2 || INCLUDE_JVMCI */
  96     }
  97     *fr_addr = ret_frame;
  98     return true;
  99   }
 100 
 101   // nothing else to try
 102   return false;
 103 }
 104 
 105 void JavaThread::cache_global_variables() { }
--- EOF ---