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/periodic/jfrThreadDumpEvent.hpp" 28 #include "logging/log.hpp" 29 #include "tracefiles/traceEventClasses.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 */ 40 static 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 59 const 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 }