/*

 * Copyright (c) 2003, 2018, 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 "memory/metaspaceShared.hpp"

#include "runtime/frame.inline.hpp"

#include "runtime/thread.inline.hpp"

frame JavaThread::pd_last_frame() {

  assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");

  vmassert(_anchor.last_Java_pc() != NULL, "not walkable");

  return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp(), _anchor.last_Java_pc());

}

// 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;

  // There is small window where last_Java_frame is not walkable or safe

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

    *fr_addr = jt->pd_last_frame();

    return true;

  }

  ucontext_t* uc = (ucontext_t*) ucontext;

  // We always want to use the initial frame we create from the ucontext as

  // it certainly signals where we currently are. However that frame may not

  // be safe for calling sender. In that case if we have a last_Java_frame

  // then the forte walker will switch to that frame as the virtual sender

  // for the frame we create here which is not sender safe.

  intptr_t* ret_fp;

  intptr_t* ret_sp;

  ExtendedPC addr = os::Solaris::fetch_frame_from_ucontext(this, uc, &ret_sp, &ret_fp);

  // Something would really have to be screwed up to get a NULL pc

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

    assert(false, "NULL pc from signal handler!");

    return false;

  }

  if (MetaspaceShared::is_in_trampoline_frame(addr.pc())) {

    // In the middle of a trampoline call. Bail out for safety.

    // This happens rarely so shouldn't affect profiling.

    return false;

  }

  // If sp and fp are nonsense just leave them out

  if (!jt->on_local_stack((address)ret_sp)) {

    ret_sp = NULL;

    ret_fp = NULL;

  } else {

    // sp is reasonable is fp reasonable?

    if ((address)ret_fp >= jt->stack_base() || ret_fp < ret_sp) {

      ret_fp = NULL;

    }

  }

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

  *fr_addr = ret_frame;

  return true;

}

void JavaThread::cache_global_variables() { }