1 /*
2 * Copyright (c) 2000, 2017, 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/objArrayOop.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "oops/typeArrayOop.inline.hpp"
35 #include "runtime/handles.inline.hpp"
36
37 bool JavaAssertions::_userDefault = false;
38 bool JavaAssertions::_sysDefault = false;
39 JavaAssertions::OptionList* JavaAssertions::_classes = 0;
40 JavaAssertions::OptionList* JavaAssertions::_packages = 0;
41
42 JavaAssertions::OptionList::OptionList(const char* name, bool enabled,
43 OptionList* next) {
44 assert(name != 0, "need a name");
45 _name = name;
46 _enabled = enabled;
47 _next = next;
48 }
49
50 int JavaAssertions::OptionList::count(OptionList* p) {
51 int rc;
52 for (rc = 0; p != 0; p = p->next(), ++rc) /* empty */;
53 return rc;
54 }
55
56 void JavaAssertions::addOption(const char* name, bool enable) {
57 assert(name != 0, "must have a name");
58
59 // Copy the name. The storage needs to exist for the the lifetime of the vm;
60 // it is never freed, so will be leaked (along with other option strings -
61 // e.g., bootclasspath) if a process creates/destroys multiple VMs.
62 int len = (int)strlen(name);
63 char *name_copy = NEW_C_HEAP_ARRAY(char, len + 1, mtClass);
64 strcpy(name_copy, name);
65
66 // Figure out which list the new item should go on. Names that end in "..."
67 // go on the package tree list.
68 OptionList** head = &_classes;
69 if (len >= 3 && strcmp(name_copy + len - 3, "...") == 0) {
70 // Delete the "...".
71 len -= 3;
72 name_copy[len] = '\0';
73 head = &_packages;
74 }
75
76 // Convert class/package names to internal format. Will have to convert back
77 // when copying to java in createJavaAssertionStatusDirectives, but that
78 // should happen only once. Alternative would require that
79 // JVM_DesiredAssertionStatus pass the external_name() to
80 // JavaAssertion::enabled(), but that is done once per loaded class.
81 for (int i = 0; i < len; ++i) {
82 if (name_copy[i] == '.') name_copy[i] = '/';
83 }
84
85 if (TraceJavaAssertions) {
86 tty->print_cr("JavaAssertions: adding %s %s=%d",
87 head == &_classes ? "class" : "package",
88 name_copy[0] != '\0' ? name_copy : "'default'",
89 enable);
90 }
91
92 // Prepend a new item to the list. Items added later take precedence, so
93 // prepending allows us to stop searching the list after the first match.
94 *head = new OptionList(name_copy, enable, *head);
95 }
96
97 oop JavaAssertions::createAssertionStatusDirectives(TRAPS) {
98 Symbol* asd_sym = vmSymbols::java_lang_AssertionStatusDirectives();
99 Klass* k = SystemDictionary::resolve_or_fail(asd_sym, true, CHECK_NULL);
100 InstanceKlass* asd_klass = InstanceKlass::cast(k);
101 asd_klass->initialize(CHECK_NULL);
102 Handle h = asd_klass->allocate_instance_handle(CHECK_NULL);
103
104 int len;
105 typeArrayOop t;
106 len = OptionList::count(_packages);
107 objArrayOop pn = oopFactory::new_objArray(SystemDictionary::String_klass(), len, CHECK_NULL);
108 objArrayHandle pkgNames (THREAD, pn);
109 t = oopFactory::new_typeArray(T_BOOLEAN, len, CHECK_NULL);
110 typeArrayHandle pkgEnabled(THREAD, t);
111 fillJavaArrays(_packages, len, pkgNames, pkgEnabled, CHECK_NULL);
112
113 len = OptionList::count(_classes);
114 objArrayOop cn = oopFactory::new_objArray(SystemDictionary::String_klass(), len, CHECK_NULL);
115 objArrayHandle classNames (THREAD, cn);
116 t = oopFactory::new_typeArray(T_BOOLEAN, len, CHECK_NULL);
117 typeArrayHandle classEnabled(THREAD, t);
118 fillJavaArrays(_classes, len, classNames, classEnabled, CHECK_NULL);
119
120 java_lang_AssertionStatusDirectives::set_packages(h(), pkgNames());
121 java_lang_AssertionStatusDirectives::set_packageEnabled(h(), pkgEnabled());
122 java_lang_AssertionStatusDirectives::set_classes(h(), classNames());
123 java_lang_AssertionStatusDirectives::set_classEnabled(h(), classEnabled());
124 java_lang_AssertionStatusDirectives::set_deflt(h(), userClassDefault());
125 return h();
126 }
127
128 void JavaAssertions::fillJavaArrays(const OptionList* p, int len,
129 objArrayHandle names, typeArrayHandle enabled, TRAPS) {
130 // Fill in the parallel names and enabled (boolean) arrays. Start at the end
131 // of the array and work backwards, so the order of items in the arrays
132 // matches the order on the command line (the list is in reverse order, since
133 // it was created by prepending successive items from the command line).
134 int index;
135 for (index = len - 1; p != 0; p = p->next(), --index) {
136 assert(index >= 0, "length does not match list");
137 Handle s = java_lang_String::create_from_str(p->name(), CHECK);
138 s = java_lang_String::char_converter(s, '/', '.', CHECK);
139 names->obj_at_put(index, s());
140 enabled->bool_at_put(index, p->enabled());
141 }
142 assert(index == -1, "length does not match list");
143 }
144
145 inline JavaAssertions::OptionList*
146 JavaAssertions::match_class(const char* classname) {
147 for (OptionList* p = _classes; p != 0; p = p->next()) {
148 if (strcmp(p->name(), classname) == 0) {
149 return p;
150 }
151 }
152 return 0;
153 }
154
155 JavaAssertions::OptionList*
156 JavaAssertions::match_package(const char* classname) {
157 // Search the package list for any items that apply to classname. Each
158 // sub-package in classname is checked, from most-specific to least, until one
159 // is found.
160 if (_packages == 0) return 0;
161
162 // Find the length of the "most-specific" package in classname. If classname
163 // does not include a package, length will be 0 which will match items for the
164 // default package (from options "-ea:..." or "-da:...").
165 size_t len = strlen(classname);
166 for (/* empty */; len > 0 && classname[len] != '/'; --len) /* empty */;
167
168 do {
169 assert(len == 0 || classname[len] == '/', "not a package name");
170 for (OptionList* p = _packages; p != 0; p = p->next()) {
171 if (strncmp(p->name(), classname, len) == 0 && p->name()[len] == '\0') {
172 return p;
173 }
174 }
175
176 // Find the length of the next package, taking care to avoid decrementing
177 // past 0 (len is unsigned).
178 while (len > 0 && classname[--len] != '/') /* empty */;
179 } while (len > 0);
180
181 return 0;
182 }
183
184 inline void JavaAssertions::trace(const char* name,
185 const char* typefound, const char* namefound, bool enabled) {
186 if (TraceJavaAssertions) {
187 tty->print_cr("JavaAssertions: search for %s found %s %s=%d",
188 name, typefound, namefound[0] != '\0' ? namefound : "'default'", enabled);
189 }
190 }
191
192 bool JavaAssertions::enabled(const char* classname, bool systemClass) {
193 assert(classname != 0, "must have a classname");
194
195 // This will be slow if the number of assertion options on the command line is
196 // large--it traverses two lists, one of them multiple times. Could use a
197 // single n-ary tree instead of lists if someone ever notices.
198
199 // First check options that apply to classes. If we find a match we're done.
200 OptionList* p;
201 if (p = match_class(classname)) {
202 trace(classname, "class", p->name(), p->enabled());
203 return p->enabled();
204 }
205
206 // Now check packages, from most specific to least.
207 if (p = match_package(classname)) {
208 trace(classname, "package", p->name(), p->enabled());
209 return p->enabled();
210 }
211
212 // No match. Return the default status.
213 bool result = systemClass ? systemClassDefault() : userClassDefault();
214 trace(classname, systemClass ? "system" : "user", "default", result);
215 return result;
216 }