1/*
2 * Copyright (c) 2015, 2018, 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 "jfr/dcmd/jfrDcmds.hpp"
27#include "jfr/jfrEvents.hpp"
28#include "jfr/periodic/jfrThreadDumpEvent.hpp"
29#include "logging/log.hpp"
30#include "utilities/exceptions.hpp"
31#include "utilities/ostream.hpp"
32
33/**
34* Worker impl for generating and writing dcmd commands
35* as jfr events.
36* dispatch to diagnosticcommands "parse_and_execute"
37*
38* param: cmd = the DCMD to execute (including options)
39*/
40static bool execute_dcmd(bufferedStream& st, const char* const cmd) {
41 Thread* THREAD = Thread::current();
42 assert(!HAS_PENDING_EXCEPTION, "dcmd does not expect pending exceptions on entry!");
43 // delegate to DCmd execution
44 DCmd::parse_and_execute(DCmd_Source_Internal, &st, cmd, ' ', THREAD);
45 if (HAS_PENDING_EXCEPTION) {
46 log_debug(jfr, system)("unable to create jfr event for DCMD %s", cmd);
47 log_debug(jfr, system)("exception type: %s", PENDING_EXCEPTION->klass()->external_name());
48 // don't unwind this exception
49 CLEAR_PENDING_EXCEPTION;
50 // if exception occurred,
51 // reset stream.
52 st.reset();
53 return false;
54 }
55 return true;
56}
57
58// caller needs ResourceMark
59const char* JfrDcmdEvent::thread_dump() {
60 assert(EventThreadDump::is_enabled(), "invariant");
61 bufferedStream st;
62 execute_dcmd(st, "Thread.print");
63 return st.as_string();
64}
65