1 /*
2 * Copyright (c) 2000, 2012, 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/javaAssertions.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "runtime/handles.inline.hpp"
34
35 bool JavaAssertions::_userDefault = false;
36 bool JavaAssertions::_sysDefault = false;
37 JavaAssertions::OptionList* JavaAssertions::_classes = 0;
38 JavaAssertions::OptionList* JavaAssertions::_packages = 0;
39
40 JavaAssertions::OptionList::OptionList(const char* name, bool enabled,
41 OptionList* next) {
42 assert(name != 0, "need a name");
43 _name = name;
44 _enabled = enabled;
45 _next = next;
46 }
47
48 int JavaAssertions::OptionList::count(OptionList* p) {
49 int rc;
50 for (rc = 0; p != 0; p = p->next(), ++rc) /* empty */;
51 return rc;
52 }
53
54 void JavaAssertions::addOption(const char* name, bool enable) {
55 assert(name != 0, "must have a name");
56
57 // Copy the name. The storage needs to exist for the the lifetime of the vm;
58 // it is never freed, so will be leaked (along with other option strings -
59 // e.g., bootclasspath) if a process creates/destroys multiple VMs.
60 int len = (int)strlen(name);
61 char *name_copy = NEW_C_HEAP_ARRAY(char, len + 1, mtClass);
62 strcpy(name_copy, name);
63
64 // Figure out which list the new item should go on. Names that end in "..."
65 // go on the package tree list.
66 OptionList** head = &_classes;
67 if (len >= 3 && strcmp(name_copy + len - 3, "...") == 0) {
68 // Delete the "...".
69 len -= 3;
70 name_copy[len] = '\0';
71 head = &_packages;
72 }
73
74 // Convert class/package names to internal format. Will have to convert back
75 // when copying to java in createJavaAssertionStatusDirectives, but that
76 // should happen only once. Alternative would require that
77 // JVM_DesiredAssertionStatus pass the external_name() to
78 // JavaAssertion::enabled(), but that is done once per loaded class.
79 for (int i = 0; i < len; ++i) {
80 if (name_copy[i] == '.') name_copy[i] = '/';
81 }
82
83 if (TraceJavaAssertions) {
84 tty->print_cr("JavaAssertions: adding %s %s=%d",
85 head == &_classes ? "class" : "package",
86 name_copy[0] != '\0' ? name_copy : "'default'",
87 enable);
88 }
89
90 // Prepend a new item to the list. Items added later take precedence, so
91 // prepending allows us to stop searching the list after the first match.
92 *head = new OptionList(name_copy, enable, *head);
93 }
94
95 oop JavaAssertions::createAssertionStatusDirectives(TRAPS) {
96 Symbol* asd_sym = vmSymbols::java_lang_AssertionStatusDirectives();
97 Klass* k = SystemDictionary::resolve_or_fail(asd_sym, true, CHECK_NULL);
98 instanceKlassHandle asd_klass (THREAD, k);
99 asd_klass->initialize(CHECK_NULL);
100 Handle h = asd_klass->allocate_instance_handle(CHECK_NULL);
101
102 int len;
103 typeArrayOop t;
104 len = OptionList::count(_packages);
105 objArrayOop pn = oopFactory::new_objArray(SystemDictionary::String_klass(), len, CHECK_NULL);
106 objArrayHandle pkgNames (THREAD, pn);
107 t = oopFactory::new_typeArray(T_BOOLEAN, len, CHECK_NULL);
108 typeArrayHandle pkgEnabled(THREAD, t);
109 fillJavaArrays(_packages, len, pkgNames, pkgEnabled, CHECK_NULL);
110
111 len = OptionList::count(_classes);
112 objArrayOop cn = oopFactory::new_objArray(SystemDictionary::String_klass(), len, CHECK_NULL);
113 objArrayHandle classNames (THREAD, cn);
114 t = oopFactory::new_typeArray(T_BOOLEAN, len, CHECK_NULL);
115 typeArrayHandle classEnabled(THREAD, t);
116 fillJavaArrays(_classes, len, classNames, classEnabled, CHECK_NULL);
117
118 java_lang_AssertionStatusDirectives::set_packages(h(), pkgNames());
119 java_lang_AssertionStatusDirectives::set_packageEnabled(h(), pkgEnabled());
120 java_lang_AssertionStatusDirectives::set_classes(h(), classNames());
121 java_lang_AssertionStatusDirectives::set_classEnabled(h(), classEnabled());
122 java_lang_AssertionStatusDirectives::set_deflt(h(), userClassDefault());
123 return h();
124 }
125
126 void JavaAssertions::fillJavaArrays(const OptionList* p, int len,
127 objArrayHandle names, typeArrayHandle enabled, TRAPS) {
128 // Fill in the parallel names and enabled (boolean) arrays. Start at the end
129 // of the array and work backwards, so the order of items in the arrays
130 // matches the order on the command line (the list is in reverse order, since
131 // it was created by prepending successive items from the command line).
132 int index;
133 for (index = len - 1; p != 0; p = p->next(), --index) {
134 assert(index >= 0, "length does not match list");
135 Handle s = java_lang_String::create_from_str(p->name(), CHECK);
136 s = java_lang_String::char_converter(s, '/', '.', CHECK);
137 names->obj_at_put(index, s());
138 enabled->bool_at_put(index, p->enabled());
139 }
140 assert(index == -1, "length does not match list");
141 }
142
143 inline JavaAssertions::OptionList*
144 JavaAssertions::match_class(const char* classname) {
145 for (OptionList* p = _classes; p != 0; p = p->next()) {
146 if (strcmp(p->name(), classname) == 0) {
147 return p;
148 }
149 }
150 return 0;
151 }
152
153 JavaAssertions::OptionList*
154 JavaAssertions::match_package(const char* classname) {
155 // Search the package list for any items that apply to classname. Each
156 // sub-package in classname is checked, from most-specific to least, until one
157 // is found.
158 if (_packages == 0) return 0;
159
160 // Find the length of the "most-specific" package in classname. If classname
161 // does not include a package, length will be 0 which will match items for the
162 // default package (from options "-ea:..." or "-da:...").
163 size_t len = strlen(classname);
164 for (/* empty */; len > 0 && classname[len] != '/'; --len) /* empty */;
165
166 do {
167 assert(len == 0 || classname[len] == '/', "not a package name");
168 for (OptionList* p = _packages; p != 0; p = p->next()) {
169 if (strncmp(p->name(), classname, len) == 0 && p->name()[len] == '\0') {
170 return p;
171 }
172 }
173
174 // Find the length of the next package, taking care to avoid decrementing
175 // past 0 (len is unsigned).
176 while (len > 0 && classname[--len] != '/') /* empty */;
177 } while (len > 0);
178
179 return 0;
180 }
181
182 inline void JavaAssertions::trace(const char* name,
183 const char* typefound, const char* namefound, bool enabled) {
184 if (TraceJavaAssertions) {
185 tty->print_cr("JavaAssertions: search for %s found %s %s=%d",
186 name, typefound, namefound[0] != '\0' ? namefound : "'default'", enabled);
187 }
188 }
189
190 bool JavaAssertions::enabled(const char* classname, bool systemClass) {
191 assert(classname != 0, "must have a classname");
192
193 // This will be slow if the number of assertion options on the command line is
194 // large--it traverses two lists, one of them multiple times. Could use a
195 // single n-ary tree instead of lists if someone ever notices.
196
197 // First check options that apply to classes. If we find a match we're done.
198 OptionList* p;
199 if (p = match_class(classname)) {
200 trace(classname, "class", p->name(), p->enabled());
201 return p->enabled();
202 }
203
204 // Now check packages, from most specific to least.
205 if (p = match_package(classname)) {
206 trace(classname, "package", p->name(), p->enabled());
207 return p->enabled();
208 }
209
210 // No match. Return the default status.
211 bool result = systemClass ? systemClassDefault() : userClassDefault();
212 trace(classname, systemClass ? "system" : "user", "default", result);
213 return result;
214 }