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comparison src/share/vm/runtime/dtraceJSDT.cpp @ 116:018d5b58dd4f

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6537506: Provide a mechanism for specifying Java-level USDT-like dtrace probes Summary: Initial checkin of JSDT code Reviewed-by: acorn, sbohne
author kamg
date Thu, 17 Apr 2008 22:18:15 -0400
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children d1605aabd0a1
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115:e7a91a357527 116:018d5b58dd4f
1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_dtraceJSDT.cpp.incl"
27
28 #ifdef HAVE_DTRACE_H
29
30 jlong DTraceJSDT::activate(
31 jint version, jstring module_name, jint providers_count,
32 JVM_DTraceProvider* providers, TRAPS) {
33
34 size_t count = 0;
35 RegisteredProbes* probes = NULL;
36
37 if (!is_supported()) {
38 return 0;
39 }
40
41 assert(module_name != NULL, "valid module name");
42 assert(providers != NULL, "valid provider array");
43
44 for (int i = 0; i < providers_count; ++i) {
45 count += providers[i].probe_count;
46 }
47 probes = new RegisteredProbes(count);
48 count = 0;
49
50 for (int i = 0; i < providers_count; ++i) {
51 assert(providers[i].name != NULL, "valid provider name");
52 assert(providers[i].probe_count == 0 || providers[i].probes != NULL,
53 "valid probe count");
54 for (int j = 0; j < providers[i].probe_count; ++j) {
55 JVM_DTraceProbe* probe = &(providers[i].probes[j]);
56 assert(probe != NULL, "valid probe");
57 assert(probe->method != NULL, "valid method");
58 assert(probe->name != NULL, "valid probe name");
59 assert(probe->function != NULL, "valid probe function spec");
60 methodHandle h_method =
61 methodHandle(THREAD, JNIHandles::resolve_jmethod_id(probe->method));
62 nmethod* nm = AdapterHandlerLibrary::create_dtrace_nmethod(h_method);
63 h_method()->set_not_compilable(CompLevel_highest_tier);
64 h_method()->set_code(h_method, nm);
65 probes->nmethod_at_put(count++, nm);
66 }
67 }
68
69 int handle = pd_activate((void*)probes,
70 module_name, providers_count, providers);
71 if (handle <= 0) {
72 delete probes;
73 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(),
74 "Unable to register DTrace probes (internal error).");
75 }
76 probes->set_helper_handle(handle);
77 return RegisteredProbes::toOpaqueProbes(probes);
78 }
79
80 jboolean DTraceJSDT::is_probe_enabled(jmethodID method) {
81 methodOop m = JNIHandles::resolve_jmethod_id(method);
82 return nativeInstruction_at(m->code()->trap_address())->is_dtrace_trap();
83 }
84
85 void DTraceJSDT::dispose(OpaqueProbes probes) {
86 RegisteredProbes* p = RegisteredProbes::toRegisteredProbes(probes);
87 if (probes != -1 && p != NULL) {
88 pd_dispose(p->helper_handle());
89 delete p;
90 }
91 }
92
93 jboolean DTraceJSDT::is_supported() {
94 return pd_is_supported();
95 }
96
97 #else // HAVE_DTRACE_H
98
99 jlong DTraceJSDT::activate(
100 jint version, jstring module_name, jint providers_count,
101 JVM_DTraceProvider* providers, TRAPS) {
102 return 0;
103 }
104
105 jboolean DTraceJSDT::is_probe_enabled(jmethodID method) {
106 return false;
107 }
108
109 void DTraceJSDT::dispose(OpaqueProbes probes) {
110 return;
111 }
112
113 jboolean DTraceJSDT::is_supported() {
114 return false;
115 }
116
117 #endif // ndef HAVE_DTRACE_H