/*

 * Copyright (c) 2015, 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 "jfr/dcmd/jfrDcmds.hpp"

#include "jfr/jfrEvents.hpp"

#include "jfr/periodic/jfrThreadDumpEvent.hpp"

#include "logging/log.hpp"

#include "utilities/exceptions.hpp"

#include "utilities/ostream.hpp"

/**

*  Worker impl for generating and writing dcmd commands

*  as jfr events.

*  dispatch to diagnosticcommands "parse_and_execute"

*

*  param: cmd = the DCMD to execute (including options)

*/

static bool execute_dcmd(bufferedStream& st, const char* const cmd) {

  Thread* THREAD = Thread::current();

  assert(!HAS_PENDING_EXCEPTION, "dcmd does not expect pending exceptions on entry!");

  // delegate to DCmd execution

  DCmd::parse_and_execute(DCmd_Source_Internal, &st, cmd, ' ', THREAD);

  if (HAS_PENDING_EXCEPTION) {

    log_debug(jfr, system)("unable to create jfr event for DCMD %s", cmd);

    log_debug(jfr, system)("exception type: %s", PENDING_EXCEPTION->klass()->external_name());

    // don't unwind this exception

    CLEAR_PENDING_EXCEPTION;

    // if exception occurred,

    // reset stream.

    st.reset();

    return false;

  }

  return true;

}

// caller needs ResourceMark

const char* JfrDcmdEvent::thread_dump() {

  assert(EventThreadDump::is_enabled(), "invariant");

  bufferedStream st;

  execute_dcmd(st, "Thread.print");

  return st.as_string();

}