Mercurial > hg > graal-compiler
annotate src/share/vm/prims/nativeLookup.cpp @ 4844:bf864f701a4a
7066129: GarbageCollectorMXBean#getLastGcInfo leaks native memory
Summary: Make GCStatInfo a resource object
Reviewed-by: phh, coleenp
author | dsamersoff |
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date | Wed, 25 Jan 2012 02:29:05 +0400 |
parents | f08d439fab8c |
children | 0382d2b469b2 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/javaClasses.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "memory/oopFactory.hpp" | |
30 #include "memory/resourceArea.hpp" | |
31 #include "memory/universe.inline.hpp" | |
32 #include "oops/instanceKlass.hpp" | |
33 #include "oops/methodOop.hpp" | |
34 #include "oops/oop.inline.hpp" | |
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35 #include "oops/symbol.hpp" |
1972 | 36 #include "prims/jvm_misc.hpp" |
37 #include "prims/nativeLookup.hpp" | |
38 #include "runtime/arguments.hpp" | |
39 #include "runtime/handles.inline.hpp" | |
40 #include "runtime/javaCalls.hpp" | |
41 #include "runtime/sharedRuntime.hpp" | |
42 #include "runtime/signature.hpp" | |
43 #ifdef TARGET_OS_FAMILY_linux | |
44 # include "os_linux.inline.hpp" | |
45 #endif | |
46 #ifdef TARGET_OS_FAMILY_solaris | |
47 # include "os_solaris.inline.hpp" | |
48 #endif | |
49 #ifdef TARGET_OS_FAMILY_windows | |
50 # include "os_windows.inline.hpp" | |
51 #endif | |
3960 | 52 #ifdef TARGET_OS_FAMILY_bsd |
53 # include "os_bsd.inline.hpp" | |
54 #endif | |
0 | 55 |
56 | |
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57 static void mangle_name_on(outputStream* st, Symbol* name, int begin, int end) { |
0 | 58 char* bytes = (char*)name->bytes() + begin; |
59 char* end_bytes = (char*)name->bytes() + end; | |
60 while (bytes < end_bytes) { | |
61 jchar c; | |
62 bytes = UTF8::next(bytes, &c); | |
63 if (c <= 0x7f && isalnum(c)) { | |
64 st->put((char) c); | |
65 } else { | |
66 if (c == '_') st->print("_1"); | |
67 else if (c == '/') st->print("_"); | |
68 else if (c == ';') st->print("_2"); | |
69 else if (c == '[') st->print("_3"); | |
70 else st->print("_%.5x", c); | |
71 } | |
72 } | |
73 } | |
74 | |
75 | |
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76 static void mangle_name_on(outputStream* st, Symbol* name) { |
0 | 77 mangle_name_on(st, name, 0, name->utf8_length()); |
78 } | |
79 | |
80 | |
81 char* NativeLookup::pure_jni_name(methodHandle method) { | |
82 stringStream st; | |
83 // Prefix | |
84 st.print("Java_"); | |
85 // Klass name | |
86 mangle_name_on(&st, method->klass_name()); | |
87 st.print("_"); | |
88 // Method name | |
89 mangle_name_on(&st, method->name()); | |
90 return st.as_string(); | |
91 } | |
92 | |
93 | |
94 char* NativeLookup::long_jni_name(methodHandle method) { | |
95 // Signature ignore the wrapping parenteses and the trailing return type | |
96 stringStream st; | |
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97 Symbol* signature = method->signature(); |
0 | 98 st.print("__"); |
99 // find ')' | |
100 int end; | |
101 for (end = 0; end < signature->utf8_length() && signature->byte_at(end) != ')'; end++); | |
102 // skip first '(' | |
103 mangle_name_on(&st, signature, 1, end); | |
104 return st.as_string(); | |
105 } | |
106 | |
107 extern "C" { | |
108 void JNICALL JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls); | |
710 | 109 void JNICALL JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass unsafecls); |
0 | 110 void JNICALL JVM_RegisterPerfMethods(JNIEnv *env, jclass perfclass); |
111 } | |
112 | |
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113 #define CC (char*) /* cast a literal from (const char*) */ |
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114 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) |
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115 |
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116 static JNINativeMethod lookup_special_native_methods[] = { |
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117 // Next two functions only exist for compatibility with 1.3.1 and earlier. |
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118 { CC"Java_java_io_ObjectOutputStream_getPrimitiveFieldValues", NULL, FN_PTR(JVM_GetPrimitiveFieldValues) }, // intercept ObjectOutputStream getPrimitiveFieldValues for faster serialization |
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119 { CC"Java_java_io_ObjectInputStream_setPrimitiveFieldValues", NULL, FN_PTR(JVM_SetPrimitiveFieldValues) }, // intercept ObjectInputStream setPrimitiveFieldValues for faster serialization |
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120 |
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121 { CC"Java_sun_misc_Unsafe_registerNatives", NULL, FN_PTR(JVM_RegisterUnsafeMethods) }, |
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122 { CC"Java_java_lang_invoke_MethodHandleNatives_registerNatives", NULL, FN_PTR(JVM_RegisterMethodHandleMethods) }, |
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123 { CC"Java_sun_misc_Perf_registerNatives", NULL, FN_PTR(JVM_RegisterPerfMethods) } |
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124 }; |
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125 |
0 | 126 static address lookup_special_native(char* jni_name) { |
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127 int i = !JDK_Version::is_gte_jdk14x_version() ? 0 : 2; // see comment in lookup_special_native_methods |
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128 int count = sizeof(lookup_special_native_methods) / sizeof(JNINativeMethod); |
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129 for (; i < count; i++) { |
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130 // NB: To ignore the jni prefix and jni postfix strstr is used matching. |
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131 if (strstr(jni_name, lookup_special_native_methods[i].name) != NULL) { |
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132 return CAST_FROM_FN_PTR(address, lookup_special_native_methods[i].fnPtr); |
0 | 133 } |
134 } | |
135 return NULL; | |
136 } | |
137 | |
138 address NativeLookup::lookup_style(methodHandle method, char* pure_name, const char* long_name, int args_size, bool os_style, bool& in_base_library, TRAPS) { | |
139 address entry; | |
140 // Compute complete JNI name for style | |
141 stringStream st; | |
142 if (os_style) os::print_jni_name_prefix_on(&st, args_size); | |
143 st.print_raw(pure_name); | |
144 st.print_raw(long_name); | |
145 if (os_style) os::print_jni_name_suffix_on(&st, args_size); | |
146 char* jni_name = st.as_string(); | |
147 | |
148 // If the loader is null we have a system class, so we attempt a lookup in | |
149 // the native Java library. This takes care of any bootstrapping problems. | |
150 // Note: It is critical for bootstrapping that Java_java_lang_ClassLoader_00024NativeLibrary_find | |
151 // gets found the first time around - otherwise an infinite loop can occure. This is | |
152 // another VM/library dependency | |
153 Handle loader(THREAD, | |
154 instanceKlass::cast(method->method_holder())->class_loader()); | |
155 if (loader.is_null()) { | |
156 entry = lookup_special_native(jni_name); | |
157 if (entry == NULL) { | |
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158 entry = (address) os::dll_lookup(os::native_java_library(), jni_name); |
0 | 159 } |
160 if (entry != NULL) { | |
161 in_base_library = true; | |
162 return entry; | |
163 } | |
164 } | |
165 | |
166 // Otherwise call static method findNative in ClassLoader | |
1142 | 167 KlassHandle klass (THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 168 Handle name_arg = java_lang_String::create_from_str(jni_name, CHECK_NULL); |
169 | |
170 JavaValue result(T_LONG); | |
171 JavaCalls::call_static(&result, | |
172 klass, | |
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173 vmSymbols::findNative_name(), |
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174 vmSymbols::classloader_string_long_signature(), |
0 | 175 // Arguments |
176 loader, | |
177 name_arg, | |
178 CHECK_NULL); | |
179 entry = (address) (intptr_t) result.get_jlong(); | |
180 | |
181 if (entry == NULL) { | |
182 // findNative didn't find it, if there are any agent libraries look in them | |
183 AgentLibrary* agent; | |
184 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
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185 entry = (address) os::dll_lookup(agent->os_lib(), jni_name); |
0 | 186 if (entry != NULL) { |
187 return entry; | |
188 } | |
189 } | |
190 } | |
191 | |
192 return entry; | |
193 } | |
194 | |
195 | |
196 // Check all the formats of native implementation name to see if there is one | |
197 // for the specified method. | |
198 address NativeLookup::lookup_entry(methodHandle method, bool& in_base_library, TRAPS) { | |
199 address entry = NULL; | |
200 in_base_library = false; | |
201 // Compute pure name | |
202 char* pure_name = pure_jni_name(method); | |
203 | |
204 // Compute argument size | |
205 int args_size = 1 // JNIEnv | |
206 + (method->is_static() ? 1 : 0) // class for static methods | |
207 + method->size_of_parameters(); // actual parameters | |
208 | |
209 | |
210 // 1) Try JNI short style | |
211 entry = lookup_style(method, pure_name, "", args_size, true, in_base_library, CHECK_NULL); | |
212 if (entry != NULL) return entry; | |
213 | |
214 // Compute long name | |
215 char* long_name = long_jni_name(method); | |
216 | |
217 // 2) Try JNI long style | |
218 entry = lookup_style(method, pure_name, long_name, args_size, true, in_base_library, CHECK_NULL); | |
219 if (entry != NULL) return entry; | |
220 | |
221 // 3) Try JNI short style without os prefix/suffix | |
222 entry = lookup_style(method, pure_name, "", args_size, false, in_base_library, CHECK_NULL); | |
223 if (entry != NULL) return entry; | |
224 | |
225 // 4) Try JNI long style without os prefix/suffix | |
226 entry = lookup_style(method, pure_name, long_name, args_size, false, in_base_library, CHECK_NULL); | |
227 | |
228 return entry; // NULL indicates not found | |
229 } | |
230 | |
231 // Check if there are any JVM TI prefixes which have been applied to the native method name. | |
232 // If any are found, remove them before attemping the look up of the | |
233 // native implementation again. | |
234 // See SetNativeMethodPrefix in the JVM TI Spec for more details. | |
235 address NativeLookup::lookup_entry_prefixed(methodHandle method, bool& in_base_library, TRAPS) { | |
236 ResourceMark rm(THREAD); | |
237 | |
238 int prefix_count; | |
239 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count); | |
240 char* in_name = method->name()->as_C_string(); | |
241 char* wrapper_name = in_name; | |
242 // last applied prefix will be first -- go backwards | |
243 for (int i = prefix_count-1; i >= 0; i--) { | |
244 char* prefix = prefixes[i]; | |
245 size_t prefix_len = strlen(prefix); | |
246 if (strncmp(prefix, wrapper_name, prefix_len) == 0) { | |
247 // has this prefix remove it | |
248 wrapper_name += prefix_len; | |
249 } | |
250 } | |
251 if (wrapper_name != in_name) { | |
252 // we have a name for a wrapping method | |
253 int wrapper_name_len = (int)strlen(wrapper_name); | |
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254 TempNewSymbol wrapper_symbol = SymbolTable::probe(wrapper_name, wrapper_name_len); |
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255 if (wrapper_symbol != NULL) { |
0 | 256 KlassHandle kh(method->method_holder()); |
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257 methodOop wrapper_method = Klass::cast(kh())->lookup_method(wrapper_symbol, |
0 | 258 method->signature()); |
259 if (wrapper_method != NULL && !wrapper_method->is_native()) { | |
260 // we found a wrapper method, use its native entry | |
261 method->set_is_prefixed_native(); | |
262 return lookup_entry(wrapper_method, in_base_library, THREAD); | |
263 } | |
264 } | |
265 } | |
266 return NULL; | |
267 } | |
268 | |
269 address NativeLookup::lookup_base(methodHandle method, bool& in_base_library, TRAPS) { | |
270 address entry = NULL; | |
271 ResourceMark rm(THREAD); | |
272 | |
273 entry = lookup_entry(method, in_base_library, THREAD); | |
274 if (entry != NULL) return entry; | |
275 | |
276 // standard native method resolution has failed. Check if there are any | |
277 // JVM TI prefixes which have been applied to the native method name. | |
278 entry = lookup_entry_prefixed(method, in_base_library, THREAD); | |
279 if (entry != NULL) return entry; | |
280 | |
281 // Native function not found, throw UnsatisfiedLinkError | |
282 THROW_MSG_0(vmSymbols::java_lang_UnsatisfiedLinkError(), | |
283 method->name_and_sig_as_C_string()); | |
284 } | |
285 | |
286 | |
287 address NativeLookup::lookup(methodHandle method, bool& in_base_library, TRAPS) { | |
288 if (!method->has_native_function()) { | |
289 address entry = lookup_base(method, in_base_library, CHECK_NULL); | |
290 method->set_native_function(entry, | |
291 methodOopDesc::native_bind_event_is_interesting); | |
292 // -verbose:jni printing | |
293 if (PrintJNIResolving) { | |
294 ResourceMark rm(THREAD); | |
295 tty->print_cr("[Dynamic-linking native method %s.%s ... JNI]", | |
296 Klass::cast(method->method_holder())->external_name(), | |
297 method->name()->as_C_string()); | |
298 } | |
299 } | |
300 return method->native_function(); | |
301 } | |
302 | |
303 address NativeLookup::base_library_lookup(const char* class_name, const char* method_name, const char* signature) { | |
304 EXCEPTION_MARK; | |
305 bool in_base_library = true; // SharedRuntime inits some math methods. | |
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306 TempNewSymbol c_name = SymbolTable::new_symbol(class_name, CATCH); |
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307 TempNewSymbol m_name = SymbolTable::new_symbol(method_name, CATCH); |
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308 TempNewSymbol s_name = SymbolTable::new_symbol(signature, CATCH); |
0 | 309 |
310 // Find the class | |
311 klassOop k = SystemDictionary::resolve_or_fail(c_name, true, CATCH); | |
312 instanceKlassHandle klass (THREAD, k); | |
313 | |
314 // Find method and invoke standard lookup | |
315 methodHandle method (THREAD, | |
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316 klass->uncached_lookup_method(m_name, s_name)); |
0 | 317 address result = lookup(method, in_base_library, CATCH); |
318 assert(in_base_library, "must be in basic library"); | |
319 guarantee(result != NULL, "must be non NULL"); | |
320 return result; | |
321 } |