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