Mercurial > hg > truffle
comparison src/share/vm/prims/nativeLookup.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | e5b0439ef4ae |
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-1:000000000000 | 0:a61af66fc99e |
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1 /* | |
2 * Copyright 1997-2006 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 # include "incls/_precompiled.incl" | |
26 # include "incls/_nativeLookup.cpp.incl" | |
27 | |
28 | |
29 static void mangle_name_on(outputStream* st, symbolOop name, int begin, int end) { | |
30 char* bytes = (char*)name->bytes() + begin; | |
31 char* end_bytes = (char*)name->bytes() + end; | |
32 while (bytes < end_bytes) { | |
33 jchar c; | |
34 bytes = UTF8::next(bytes, &c); | |
35 if (c <= 0x7f && isalnum(c)) { | |
36 st->put((char) c); | |
37 } else { | |
38 if (c == '_') st->print("_1"); | |
39 else if (c == '/') st->print("_"); | |
40 else if (c == ';') st->print("_2"); | |
41 else if (c == '[') st->print("_3"); | |
42 else st->print("_%.5x", c); | |
43 } | |
44 } | |
45 } | |
46 | |
47 | |
48 static void mangle_name_on(outputStream* st, symbolOop name) { | |
49 mangle_name_on(st, name, 0, name->utf8_length()); | |
50 } | |
51 | |
52 | |
53 char* NativeLookup::pure_jni_name(methodHandle method) { | |
54 stringStream st; | |
55 // Prefix | |
56 st.print("Java_"); | |
57 // Klass name | |
58 mangle_name_on(&st, method->klass_name()); | |
59 st.print("_"); | |
60 // Method name | |
61 mangle_name_on(&st, method->name()); | |
62 return st.as_string(); | |
63 } | |
64 | |
65 | |
66 char* NativeLookup::long_jni_name(methodHandle method) { | |
67 // Signature ignore the wrapping parenteses and the trailing return type | |
68 stringStream st; | |
69 symbolOop signature = method->signature(); | |
70 st.print("__"); | |
71 // find ')' | |
72 int end; | |
73 for (end = 0; end < signature->utf8_length() && signature->byte_at(end) != ')'; end++); | |
74 // skip first '(' | |
75 mangle_name_on(&st, signature, 1, end); | |
76 return st.as_string(); | |
77 } | |
78 | |
79 extern "C" { | |
80 void JNICALL JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls); | |
81 void JNICALL JVM_RegisterPerfMethods(JNIEnv *env, jclass perfclass); | |
82 } | |
83 | |
84 static address lookup_special_native(char* jni_name) { | |
85 // NB: To ignore the jni prefix and jni postfix strstr is used matching. | |
86 if (!JDK_Version::is_gte_jdk14x_version()) { | |
87 // These functions only exist for compatibility with 1.3.1 and earlier | |
88 // Intercept ObjectOutputStream getPrimitiveFieldValues for faster serialization | |
89 if (strstr(jni_name, "Java_java_io_ObjectOutputStream_getPrimitiveFieldValues") != NULL) { | |
90 return CAST_FROM_FN_PTR(address, JVM_GetPrimitiveFieldValues); | |
91 } | |
92 // Intercept ObjectInputStream setPrimitiveFieldValues for faster serialization | |
93 if (strstr(jni_name, "Java_java_io_ObjectInputStream_setPrimitiveFieldValues") != NULL) { | |
94 return CAST_FROM_FN_PTR(address, JVM_SetPrimitiveFieldValues); | |
95 } | |
96 } | |
97 if (strstr(jni_name, "Java_sun_misc_Unsafe_registerNatives") != NULL) { | |
98 return CAST_FROM_FN_PTR(address, JVM_RegisterUnsafeMethods); | |
99 } | |
100 if (strstr(jni_name, "Java_sun_misc_Perf_registerNatives") != NULL) { | |
101 return CAST_FROM_FN_PTR(address, JVM_RegisterPerfMethods); | |
102 } | |
103 | |
104 return NULL; | |
105 } | |
106 | |
107 address NativeLookup::lookup_style(methodHandle method, char* pure_name, const char* long_name, int args_size, bool os_style, bool& in_base_library, TRAPS) { | |
108 address entry; | |
109 // Compute complete JNI name for style | |
110 stringStream st; | |
111 if (os_style) os::print_jni_name_prefix_on(&st, args_size); | |
112 st.print_raw(pure_name); | |
113 st.print_raw(long_name); | |
114 if (os_style) os::print_jni_name_suffix_on(&st, args_size); | |
115 char* jni_name = st.as_string(); | |
116 | |
117 // If the loader is null we have a system class, so we attempt a lookup in | |
118 // the native Java library. This takes care of any bootstrapping problems. | |
119 // Note: It is critical for bootstrapping that Java_java_lang_ClassLoader_00024NativeLibrary_find | |
120 // gets found the first time around - otherwise an infinite loop can occure. This is | |
121 // another VM/library dependency | |
122 Handle loader(THREAD, | |
123 instanceKlass::cast(method->method_holder())->class_loader()); | |
124 if (loader.is_null()) { | |
125 entry = lookup_special_native(jni_name); | |
126 if (entry == NULL) { | |
127 entry = (address) hpi::dll_lookup(os::native_java_library(), jni_name); | |
128 } | |
129 if (entry != NULL) { | |
130 in_base_library = true; | |
131 return entry; | |
132 } | |
133 } | |
134 | |
135 // Otherwise call static method findNative in ClassLoader | |
136 KlassHandle klass (THREAD, SystemDictionary::classloader_klass()); | |
137 Handle name_arg = java_lang_String::create_from_str(jni_name, CHECK_NULL); | |
138 | |
139 JavaValue result(T_LONG); | |
140 JavaCalls::call_static(&result, | |
141 klass, | |
142 vmSymbolHandles::findNative_name(), | |
143 vmSymbolHandles::classloader_string_long_signature(), | |
144 // Arguments | |
145 loader, | |
146 name_arg, | |
147 CHECK_NULL); | |
148 entry = (address) (intptr_t) result.get_jlong(); | |
149 | |
150 if (entry == NULL) { | |
151 // findNative didn't find it, if there are any agent libraries look in them | |
152 AgentLibrary* agent; | |
153 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
154 entry = (address) hpi::dll_lookup(agent->os_lib(), jni_name); | |
155 if (entry != NULL) { | |
156 return entry; | |
157 } | |
158 } | |
159 } | |
160 | |
161 return entry; | |
162 } | |
163 | |
164 | |
165 // Check all the formats of native implementation name to see if there is one | |
166 // for the specified method. | |
167 address NativeLookup::lookup_entry(methodHandle method, bool& in_base_library, TRAPS) { | |
168 address entry = NULL; | |
169 in_base_library = false; | |
170 // Compute pure name | |
171 char* pure_name = pure_jni_name(method); | |
172 | |
173 // Compute argument size | |
174 int args_size = 1 // JNIEnv | |
175 + (method->is_static() ? 1 : 0) // class for static methods | |
176 + method->size_of_parameters(); // actual parameters | |
177 | |
178 | |
179 // 1) Try JNI short style | |
180 entry = lookup_style(method, pure_name, "", args_size, true, in_base_library, CHECK_NULL); | |
181 if (entry != NULL) return entry; | |
182 | |
183 // Compute long name | |
184 char* long_name = long_jni_name(method); | |
185 | |
186 // 2) Try JNI long style | |
187 entry = lookup_style(method, pure_name, long_name, args_size, true, in_base_library, CHECK_NULL); | |
188 if (entry != NULL) return entry; | |
189 | |
190 // 3) Try JNI short style without os prefix/suffix | |
191 entry = lookup_style(method, pure_name, "", args_size, false, in_base_library, CHECK_NULL); | |
192 if (entry != NULL) return entry; | |
193 | |
194 // 4) Try JNI long style without os prefix/suffix | |
195 entry = lookup_style(method, pure_name, long_name, args_size, false, in_base_library, CHECK_NULL); | |
196 | |
197 return entry; // NULL indicates not found | |
198 } | |
199 | |
200 // Check if there are any JVM TI prefixes which have been applied to the native method name. | |
201 // If any are found, remove them before attemping the look up of the | |
202 // native implementation again. | |
203 // See SetNativeMethodPrefix in the JVM TI Spec for more details. | |
204 address NativeLookup::lookup_entry_prefixed(methodHandle method, bool& in_base_library, TRAPS) { | |
205 ResourceMark rm(THREAD); | |
206 | |
207 int prefix_count; | |
208 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count); | |
209 char* in_name = method->name()->as_C_string(); | |
210 char* wrapper_name = in_name; | |
211 // last applied prefix will be first -- go backwards | |
212 for (int i = prefix_count-1; i >= 0; i--) { | |
213 char* prefix = prefixes[i]; | |
214 size_t prefix_len = strlen(prefix); | |
215 if (strncmp(prefix, wrapper_name, prefix_len) == 0) { | |
216 // has this prefix remove it | |
217 wrapper_name += prefix_len; | |
218 } | |
219 } | |
220 if (wrapper_name != in_name) { | |
221 // we have a name for a wrapping method | |
222 int wrapper_name_len = (int)strlen(wrapper_name); | |
223 symbolHandle wrapper_symbol(THREAD, SymbolTable::probe(wrapper_name, wrapper_name_len)); | |
224 if (!wrapper_symbol.is_null()) { | |
225 KlassHandle kh(method->method_holder()); | |
226 methodOop wrapper_method = Klass::cast(kh())->lookup_method(wrapper_symbol(), | |
227 method->signature()); | |
228 if (wrapper_method != NULL && !wrapper_method->is_native()) { | |
229 // we found a wrapper method, use its native entry | |
230 method->set_is_prefixed_native(); | |
231 return lookup_entry(wrapper_method, in_base_library, THREAD); | |
232 } | |
233 } | |
234 } | |
235 return NULL; | |
236 } | |
237 | |
238 address NativeLookup::lookup_base(methodHandle method, bool& in_base_library, TRAPS) { | |
239 address entry = NULL; | |
240 ResourceMark rm(THREAD); | |
241 | |
242 entry = lookup_entry(method, in_base_library, THREAD); | |
243 if (entry != NULL) return entry; | |
244 | |
245 // standard native method resolution has failed. Check if there are any | |
246 // JVM TI prefixes which have been applied to the native method name. | |
247 entry = lookup_entry_prefixed(method, in_base_library, THREAD); | |
248 if (entry != NULL) return entry; | |
249 | |
250 // Native function not found, throw UnsatisfiedLinkError | |
251 THROW_MSG_0(vmSymbols::java_lang_UnsatisfiedLinkError(), | |
252 method->name_and_sig_as_C_string()); | |
253 } | |
254 | |
255 | |
256 address NativeLookup::lookup(methodHandle method, bool& in_base_library, TRAPS) { | |
257 if (!method->has_native_function()) { | |
258 address entry = lookup_base(method, in_base_library, CHECK_NULL); | |
259 method->set_native_function(entry, | |
260 methodOopDesc::native_bind_event_is_interesting); | |
261 // -verbose:jni printing | |
262 if (PrintJNIResolving) { | |
263 ResourceMark rm(THREAD); | |
264 tty->print_cr("[Dynamic-linking native method %s.%s ... JNI]", | |
265 Klass::cast(method->method_holder())->external_name(), | |
266 method->name()->as_C_string()); | |
267 } | |
268 } | |
269 return method->native_function(); | |
270 } | |
271 | |
272 address NativeLookup::base_library_lookup(const char* class_name, const char* method_name, const char* signature) { | |
273 EXCEPTION_MARK; | |
274 bool in_base_library = true; // SharedRuntime inits some math methods. | |
275 symbolHandle c_name = oopFactory::new_symbol_handle(class_name, CATCH); | |
276 symbolHandle m_name = oopFactory::new_symbol_handle(method_name, CATCH); | |
277 symbolHandle s_name = oopFactory::new_symbol_handle(signature, CATCH); | |
278 | |
279 // Find the class | |
280 klassOop k = SystemDictionary::resolve_or_fail(c_name, true, CATCH); | |
281 instanceKlassHandle klass (THREAD, k); | |
282 | |
283 // Find method and invoke standard lookup | |
284 methodHandle method (THREAD, | |
285 klass->uncached_lookup_method(m_name(), s_name())); | |
286 address result = lookup(method, in_base_library, CATCH); | |
287 assert(in_base_library, "must be in basic library"); | |
288 guarantee(result != NULL, "must be non NULL"); | |
289 return result; | |
290 } |