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comparison src/share/vm/runtime/dtraceJSDT.hpp @ 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 class RegisteredProbes;
26 typedef jlong OpaqueProbes;
27
28 class DTraceJSDT : AllStatic {
29 private:
30
31 static int pd_activate(void* moduleBaseAddress, jstring module,
32 jint providers_count, JVM_DTraceProvider* providers);
33 static void pd_dispose(int handle);
34 static jboolean pd_is_supported();
35
36 public:
37
38 static OpaqueProbes activate(
39 jint version, jstring module_name, jint providers_count,
40 JVM_DTraceProvider* providers, TRAPS);
41 static jboolean is_probe_enabled(jmethodID method);
42 static void dispose(OpaqueProbes handle);
43 static jboolean is_supported();
44 };
45
46 class RegisteredProbes : public CHeapObj {
47 private:
48 nmethod** _nmethods; // all the probe methods
49 size_t _count; // number of probe methods
50 int _helper_handle; // DTrace-assigned identifier
51
52 public:
53 RegisteredProbes(size_t count) {
54 _count = count;
55 _nmethods = NEW_C_HEAP_ARRAY(nmethod*, count);
56 }
57
58 ~RegisteredProbes() {
59 for (size_t i = 0; i < _count; ++i) {
60 // Let the sweeper reclaim it
61 _nmethods[i]->make_not_entrant();
62 _nmethods[i]->method()->clear_code();
63 }
64 FREE_C_HEAP_ARRAY(nmethod*, _nmethods);
65 _nmethods = NULL;
66 _count = 0;
67 }
68
69 static RegisteredProbes* toRegisteredProbes(OpaqueProbes p) {
70 return (RegisteredProbes*)(intptr_t)p;
71 }
72
73 static OpaqueProbes toOpaqueProbes(RegisteredProbes* p) {
74 return (OpaqueProbes)(intptr_t)p;
75 }
76
77 void set_helper_handle(int handle) { _helper_handle = handle; }
78 int helper_handle() const { return _helper_handle; }
79
80 nmethod* nmethod_at(size_t i) {
81 assert(i >= 0 && i < _count, "bad nmethod index");
82 return _nmethods[i];
83 }
84
85 void nmethod_at_put(size_t i, nmethod* nm) {
86 assert(i >= 0 && i < _count, "bad nmethod index");
87 _nmethods[i] = nm;
88 }
89 };