Java example source code file (thread_windows_x86.cpp)

This example Java source code file (thread_windows_x86.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

amd64, compiler2, context\*, extendedpc, javathread, javathread\:\:cache_global_variables, javathread\:\:pd_get_top_frame, javathread\:\:pd_get_top_frame_for_profiling, javathread\:\:pd_get_top_frame_for_signal_handler, null

The thread_windows_x86.cpp Java example source code

/*
 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. 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.inline.hpp"

// For Forte Analyzer AsyncGetCallTrace profiling support - thread is
// currently interrupted by SIGPROF
bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
  void* ucontext, bool isInJava) {

  assert(Thread::current() == this, "caller must be current thread");
  return pd_get_top_frame(fr_addr, ucontext, isInJava);
}

bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
  return pd_get_top_frame(fr_addr, ucontext, isInJava);
}

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

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

  JavaThread* jt = (JavaThread *)this;

  // If we have a last_Java_frame, then we should use it even if
  // isInJava == true.  It should be more reliable than CONTEXT info.
  if (jt->has_last_Java_frame()) {
    *fr_addr = jt->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 CONTEXT
  // if we were running Java code when SIGPROF came in.
  if (isInJava) {
    CONTEXT* uc = (CONTEXT*)ucontext;

#ifdef AMD64
    intptr_t* ret_fp = (intptr_t*) uc->Rbp;
    intptr_t* ret_sp = (intptr_t*) uc->Rsp;
    ExtendedPC addr = ExtendedPC((address)uc->Rip);
#else
    intptr_t* ret_fp = (intptr_t*) uc->Ebp;
    intptr_t* ret_sp = (intptr_t*) uc->Esp;
    ExtendedPC addr = ExtendedPC((address)uc->Eip);
#endif // AMD64
    if (addr.pc() == NULL || ret_sp == NULL ) {
      // CONTEXT wasn't useful
      return false;
    }

    frame ret_frame(ret_sp, ret_fp, addr.pc());
    if (!ret_frame.safe_for_sender(jt)) {
#ifdef COMPILER2
      // C2 uses ebp as a general register see if NULL fp helps
      frame ret_frame2(ret_sp, NULL, addr.pc());
      if (!ret_frame2.safe_for_sender(jt)) {
        // nothing else to try if the frame isn't good
        return false;
      }
      ret_frame = ret_frame2;
#else
      // nothing else to try if the frame isn't good
      return false;
#endif /* COMPILER2 */
    }
    *fr_addr = ret_frame;
    return true;
  }

  // nothing else to try
  return false;
}

void JavaThread::cache_global_variables() { }