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 "classfile/classLoaderData.hpp"
27 #include "classfile/moduleEntry.hpp"
28 #include "classfile/packageEntry.hpp"
29 #include "jfr/jfrEvents.hpp"
30 #include "jfr/periodic/jfrModuleEvent.hpp"
31 #include "jfr/utilities/jfrTime.hpp"
32 #include "runtime/mutexLocker.hpp"
33
34 // we want all periodic module events to have the same timestamp
35 static JfrTicks invocation_time;
36
37 typedef void (*EventFunc)(const void* iterated_address, const ModuleEntry* module);
38 class ModuleEventCallbackClosure : public ModuleClosure {
39 protected:
40 const EventFunc _event_func;
41 ModuleEventCallbackClosure(EventFunc ef) : _event_func(ef) {}
42 };
43
44 class ModuleDependencyClosure : public ModuleEventCallbackClosure {
45 private:
46 const ModuleEntry* const _module;
47 public:
48 ModuleDependencyClosure(const ModuleEntry* module, EventFunc ef) : ModuleEventCallbackClosure(ef), _module(module) {}
49 void do_module(ModuleEntry* entry);
50 };
51
52 class ModuleExportClosure : public ModuleEventCallbackClosure {
53 private:
54 const PackageEntry* const _package;
55 public:
56 ModuleExportClosure(const PackageEntry* pkg, EventFunc ef) : ModuleEventCallbackClosure(ef), _package(pkg) {}
57 void do_module(ModuleEntry* entry);
58 };
59
60 static void write_module_dependency_event(const void* from_module, const ModuleEntry* to_module) {
61 EventModuleRequire event(UNTIMED);
62 event.set_endtime(invocation_time);
63 event.set_source((const ModuleEntry* const)from_module);
64 event.set_requiredModule(to_module);
65 event.commit();
66 }
67
68 static void write_module_export_event(const void* package, const ModuleEntry* qualified_export) {
69 EventModuleExport event(UNTIMED);
70 event.set_endtime(invocation_time);
71 event.set_exportedPackage((const PackageEntry*)package);
72 event.set_targetModule(qualified_export);
73 event.commit();
74 }
75
76 void ModuleDependencyClosure::do_module(ModuleEntry* to_module) {
77 assert_locked_or_safepoint(Module_lock);
78 assert(to_module != NULL, "invariant");
79 assert(_module != NULL, "invariant");
80 assert(_event_func != NULL, "invariant");
81 _event_func(_module, to_module);
82 }
83
84 void ModuleExportClosure::do_module(ModuleEntry* qualified_export) {
85 assert_locked_or_safepoint(Module_lock);
86 assert(qualified_export != NULL, "invariant");
87 assert(_package != NULL, "invariant");
88 assert(_event_func != NULL, "invariant");
89 _event_func(_package, qualified_export);
90 }
91
92 static void module_dependency_event_callback(ModuleEntry* module) {
93 assert_locked_or_safepoint(Module_lock);
94 assert(module != NULL, "invariant");
95 if (module->has_reads_list()) {
96 // create an individual event for each directed edge
97 ModuleDependencyClosure directed_edges(module, &write_module_dependency_event);
98 module->module_reads_do(&directed_edges);
99 }
100 }
101
102 static void module_export_event_callback(PackageEntry* package) {
103 assert_locked_or_safepoint(Module_lock);
104 assert(package != NULL, "invariant");
105 if (package->is_exported()) {
106 if (package->has_qual_exports_list()) {
107 // package is qualifiedly exported to a set of modules,
108 // create an event for each module in the qualified exported list
109 ModuleExportClosure qexports(package, &write_module_export_event);
110 package->package_exports_do(&qexports);
111 return;
112 }
113
114 assert(!package->is_qual_exported() || package->is_exported_allUnnamed(), "invariant");
115 // no qualified exports
116 // only create a single event with NULL
117 // for the qualified_exports module
118 write_module_export_event(package, NULL);
119 }
120 }
121
122 void JfrModuleEvent::generate_module_dependency_events() {
123 invocation_time = JfrTicks::now();
124 MutexLocker cld_lock(ClassLoaderDataGraph_lock);
125 MutexLocker module_lock(Module_lock);
126 ClassLoaderDataGraph::modules_do(&module_dependency_event_callback);
127 }
128
129 void JfrModuleEvent::generate_module_export_events() {
130 invocation_time = JfrTicks::now();
131 MutexLocker cld_lock(ClassLoaderDataGraph_lock);
132 MutexLocker module_lock(Module_lock);
133 ClassLoaderDataGraph::packages_do(&module_export_event_callback);
134 }