Mercurial > hg > truffle
annotate src/share/vm/prims/nativeLookup.cpp @ 17546:46fa2940e686 jdk8u5-b07
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author | asaha |
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date | Sun, 02 Feb 2014 22:45:03 -0800 |
parents | 55fb97c4c58d |
children | abec000618bf |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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" | |
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33 #include "oops/method.hpp" |
1972 | 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" | |
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43 #include "utilities/macros.hpp" |
1972 | 44 #ifdef TARGET_OS_FAMILY_linux |
45 # include "os_linux.inline.hpp" | |
46 #endif | |
47 #ifdef TARGET_OS_FAMILY_solaris | |
48 # include "os_solaris.inline.hpp" | |
49 #endif | |
50 #ifdef TARGET_OS_FAMILY_windows | |
51 # include "os_windows.inline.hpp" | |
52 #endif | |
3960 | 53 #ifdef TARGET_OS_FAMILY_bsd |
54 # include "os_bsd.inline.hpp" | |
55 #endif | |
0 | 56 |
57 | |
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58 static void mangle_name_on(outputStream* st, Symbol* name, int begin, int end) { |
0 | 59 char* bytes = (char*)name->bytes() + begin; |
60 char* end_bytes = (char*)name->bytes() + end; | |
61 while (bytes < end_bytes) { | |
62 jchar c; | |
63 bytes = UTF8::next(bytes, &c); | |
64 if (c <= 0x7f && isalnum(c)) { | |
65 st->put((char) c); | |
66 } else { | |
67 if (c == '_') st->print("_1"); | |
68 else if (c == '/') st->print("_"); | |
69 else if (c == ';') st->print("_2"); | |
70 else if (c == '[') st->print("_3"); | |
71 else st->print("_%.5x", c); | |
72 } | |
73 } | |
74 } | |
75 | |
76 | |
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77 static void mangle_name_on(outputStream* st, Symbol* name) { |
0 | 78 mangle_name_on(st, name, 0, name->utf8_length()); |
79 } | |
80 | |
81 | |
82 char* NativeLookup::pure_jni_name(methodHandle method) { | |
83 stringStream st; | |
84 // Prefix | |
85 st.print("Java_"); | |
86 // Klass name | |
87 mangle_name_on(&st, method->klass_name()); | |
88 st.print("_"); | |
89 // Method name | |
90 mangle_name_on(&st, method->name()); | |
91 return st.as_string(); | |
92 } | |
93 | |
94 | |
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95 char* NativeLookup::critical_jni_name(methodHandle method) { |
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96 stringStream st; |
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97 // Prefix |
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98 st.print("JavaCritical_"); |
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99 // Klass name |
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100 mangle_name_on(&st, method->klass_name()); |
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101 st.print("_"); |
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102 // Method name |
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103 mangle_name_on(&st, method->name()); |
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104 return st.as_string(); |
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105 } |
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106 |
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107 |
0 | 108 char* NativeLookup::long_jni_name(methodHandle method) { |
109 // Signature ignore the wrapping parenteses and the trailing return type | |
110 stringStream st; | |
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111 Symbol* signature = method->signature(); |
0 | 112 st.print("__"); |
113 // find ')' | |
114 int end; | |
115 for (end = 0; end < signature->utf8_length() && signature->byte_at(end) != ')'; end++); | |
116 // skip first '(' | |
117 mangle_name_on(&st, signature, 1, end); | |
118 return st.as_string(); | |
119 } | |
120 | |
121 extern "C" { | |
122 void JNICALL JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls); | |
710 | 123 void JNICALL JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass unsafecls); |
0 | 124 void JNICALL JVM_RegisterPerfMethods(JNIEnv *env, jclass perfclass); |
5915 | 125 void JNICALL JVM_RegisterWhiteBoxMethods(JNIEnv *env, jclass wbclass); |
0 | 126 } |
127 | |
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128 #define CC (char*) /* cast a literal from (const char*) */ |
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129 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) |
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130 |
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131 static JNINativeMethod lookup_special_native_methods[] = { |
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132 { CC"Java_sun_misc_Unsafe_registerNatives", NULL, FN_PTR(JVM_RegisterUnsafeMethods) }, |
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133 { CC"Java_java_lang_invoke_MethodHandleNatives_registerNatives", NULL, FN_PTR(JVM_RegisterMethodHandleMethods) }, |
5915 | 134 { CC"Java_sun_misc_Perf_registerNatives", NULL, FN_PTR(JVM_RegisterPerfMethods) }, |
135 { CC"Java_sun_hotspot_WhiteBox_registerNatives", NULL, FN_PTR(JVM_RegisterWhiteBoxMethods) }, | |
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136 }; |
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137 |
0 | 138 static address lookup_special_native(char* jni_name) { |
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139 int count = sizeof(lookup_special_native_methods) / sizeof(JNINativeMethod); |
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140 for (int i = 0; i < count; i++) { |
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141 // NB: To ignore the jni prefix and jni postfix strstr is used matching. |
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142 if (strstr(jni_name, lookup_special_native_methods[i].name) != NULL) { |
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143 return CAST_FROM_FN_PTR(address, lookup_special_native_methods[i].fnPtr); |
0 | 144 } |
145 } | |
146 return NULL; | |
147 } | |
148 | |
149 address NativeLookup::lookup_style(methodHandle method, char* pure_name, const char* long_name, int args_size, bool os_style, bool& in_base_library, TRAPS) { | |
150 address entry; | |
151 // Compute complete JNI name for style | |
152 stringStream st; | |
153 if (os_style) os::print_jni_name_prefix_on(&st, args_size); | |
154 st.print_raw(pure_name); | |
155 st.print_raw(long_name); | |
156 if (os_style) os::print_jni_name_suffix_on(&st, args_size); | |
157 char* jni_name = st.as_string(); | |
158 | |
159 // If the loader is null we have a system class, so we attempt a lookup in | |
160 // the native Java library. This takes care of any bootstrapping problems. | |
161 // Note: It is critical for bootstrapping that Java_java_lang_ClassLoader_00024NativeLibrary_find | |
162 // gets found the first time around - otherwise an infinite loop can occure. This is | |
163 // another VM/library dependency | |
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164 Handle loader(THREAD, method->method_holder()->class_loader()); |
0 | 165 if (loader.is_null()) { |
166 entry = lookup_special_native(jni_name); | |
167 if (entry == NULL) { | |
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168 entry = (address) os::dll_lookup(os::native_java_library(), jni_name); |
0 | 169 } |
170 if (entry != NULL) { | |
171 in_base_library = true; | |
172 return entry; | |
173 } | |
174 } | |
175 | |
176 // Otherwise call static method findNative in ClassLoader | |
1142 | 177 KlassHandle klass (THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 178 Handle name_arg = java_lang_String::create_from_str(jni_name, CHECK_NULL); |
179 | |
180 JavaValue result(T_LONG); | |
181 JavaCalls::call_static(&result, | |
182 klass, | |
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183 vmSymbols::findNative_name(), |
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184 vmSymbols::classloader_string_long_signature(), |
0 | 185 // Arguments |
186 loader, | |
187 name_arg, | |
188 CHECK_NULL); | |
189 entry = (address) (intptr_t) result.get_jlong(); | |
190 | |
191 if (entry == NULL) { | |
192 // findNative didn't find it, if there are any agent libraries look in them | |
193 AgentLibrary* agent; | |
194 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
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195 entry = (address) os::dll_lookup(agent->os_lib(), jni_name); |
0 | 196 if (entry != NULL) { |
197 return entry; | |
198 } | |
199 } | |
200 } | |
201 | |
202 return entry; | |
203 } | |
204 | |
205 | |
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206 address NativeLookup::lookup_critical_style(methodHandle method, char* pure_name, const char* long_name, int args_size, bool os_style) { |
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207 if (!method->has_native_function()) { |
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208 return NULL; |
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209 } |
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210 |
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211 address current_entry = method->native_function(); |
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212 |
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213 char dll_name[JVM_MAXPATHLEN]; |
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214 int offset; |
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215 if (os::dll_address_to_library_name(current_entry, dll_name, sizeof(dll_name), &offset)) { |
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216 char ebuf[32]; |
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217 void* dll = os::dll_load(dll_name, ebuf, sizeof(ebuf)); |
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218 if (dll != NULL) { |
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219 // Compute complete JNI name for style |
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220 stringStream st; |
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221 if (os_style) os::print_jni_name_prefix_on(&st, args_size); |
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222 st.print_raw(pure_name); |
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223 st.print_raw(long_name); |
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224 if (os_style) os::print_jni_name_suffix_on(&st, args_size); |
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225 char* jni_name = st.as_string(); |
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226 return (address)os::dll_lookup(dll, jni_name); |
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227 } |
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228 } |
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229 |
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230 return NULL; |
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231 } |
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232 |
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233 |
0 | 234 // Check all the formats of native implementation name to see if there is one |
235 // for the specified method. | |
236 address NativeLookup::lookup_entry(methodHandle method, bool& in_base_library, TRAPS) { | |
237 address entry = NULL; | |
238 in_base_library = false; | |
239 // Compute pure name | |
240 char* pure_name = pure_jni_name(method); | |
241 | |
242 // Compute argument size | |
243 int args_size = 1 // JNIEnv | |
244 + (method->is_static() ? 1 : 0) // class for static methods | |
245 + method->size_of_parameters(); // actual parameters | |
246 | |
247 | |
248 // 1) Try JNI short style | |
249 entry = lookup_style(method, pure_name, "", args_size, true, in_base_library, CHECK_NULL); | |
250 if (entry != NULL) return entry; | |
251 | |
252 // Compute long name | |
253 char* long_name = long_jni_name(method); | |
254 | |
255 // 2) Try JNI long style | |
256 entry = lookup_style(method, pure_name, long_name, args_size, true, in_base_library, CHECK_NULL); | |
257 if (entry != NULL) return entry; | |
258 | |
259 // 3) Try JNI short style without os prefix/suffix | |
260 entry = lookup_style(method, pure_name, "", args_size, false, in_base_library, CHECK_NULL); | |
261 if (entry != NULL) return entry; | |
262 | |
263 // 4) Try JNI long style without os prefix/suffix | |
264 entry = lookup_style(method, pure_name, long_name, args_size, false, in_base_library, CHECK_NULL); | |
265 | |
266 return entry; // NULL indicates not found | |
267 } | |
268 | |
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269 // Check all the formats of native implementation name to see if there is one |
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270 // for the specified method. |
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271 address NativeLookup::lookup_critical_entry(methodHandle method) { |
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272 if (!CriticalJNINatives) return NULL; |
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273 |
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274 if (method->is_synchronized() || |
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275 !method->is_static()) { |
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276 // Only static non-synchronized methods are allowed |
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277 return NULL; |
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278 } |
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279 |
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280 ResourceMark rm; |
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281 address entry = NULL; |
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282 |
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283 Symbol* signature = method->signature(); |
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284 for (int end = 0; end < signature->utf8_length(); end++) { |
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285 if (signature->byte_at(end) == 'L') { |
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286 // Don't allow object types |
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287 return NULL; |
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288 } |
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289 } |
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290 |
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291 // Compute critical name |
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292 char* critical_name = critical_jni_name(method); |
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293 |
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294 // Compute argument size |
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295 int args_size = 1 // JNIEnv |
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296 + (method->is_static() ? 1 : 0) // class for static methods |
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297 + method->size_of_parameters(); // actual parameters |
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298 |
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299 |
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300 // 1) Try JNI short style |
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301 entry = lookup_critical_style(method, critical_name, "", args_size, true); |
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302 if (entry != NULL) return entry; |
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303 |
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304 // Compute long name |
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305 char* long_name = long_jni_name(method); |
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306 |
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307 // 2) Try JNI long style |
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308 entry = lookup_critical_style(method, critical_name, long_name, args_size, true); |
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309 if (entry != NULL) return entry; |
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310 |
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311 // 3) Try JNI short style without os prefix/suffix |
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312 entry = lookup_critical_style(method, critical_name, "", args_size, false); |
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313 if (entry != NULL) return entry; |
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314 |
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315 // 4) Try JNI long style without os prefix/suffix |
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316 entry = lookup_critical_style(method, critical_name, long_name, args_size, false); |
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317 |
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318 return entry; // NULL indicates not found |
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319 } |
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320 |
0 | 321 // Check if there are any JVM TI prefixes which have been applied to the native method name. |
322 // If any are found, remove them before attemping the look up of the | |
323 // native implementation again. | |
324 // See SetNativeMethodPrefix in the JVM TI Spec for more details. | |
325 address NativeLookup::lookup_entry_prefixed(methodHandle method, bool& in_base_library, TRAPS) { | |
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326 #if INCLUDE_JVMTI |
0 | 327 ResourceMark rm(THREAD); |
328 | |
329 int prefix_count; | |
330 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count); | |
331 char* in_name = method->name()->as_C_string(); | |
332 char* wrapper_name = in_name; | |
333 // last applied prefix will be first -- go backwards | |
334 for (int i = prefix_count-1; i >= 0; i--) { | |
335 char* prefix = prefixes[i]; | |
336 size_t prefix_len = strlen(prefix); | |
337 if (strncmp(prefix, wrapper_name, prefix_len) == 0) { | |
338 // has this prefix remove it | |
339 wrapper_name += prefix_len; | |
340 } | |
341 } | |
342 if (wrapper_name != in_name) { | |
343 // we have a name for a wrapping method | |
344 int wrapper_name_len = (int)strlen(wrapper_name); | |
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345 TempNewSymbol wrapper_symbol = SymbolTable::probe(wrapper_name, wrapper_name_len); |
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346 if (wrapper_symbol != NULL) { |
0 | 347 KlassHandle kh(method->method_holder()); |
6983 | 348 Method* wrapper_method = kh()->lookup_method(wrapper_symbol, |
0 | 349 method->signature()); |
350 if (wrapper_method != NULL && !wrapper_method->is_native()) { | |
351 // we found a wrapper method, use its native entry | |
352 method->set_is_prefixed_native(); | |
353 return lookup_entry(wrapper_method, in_base_library, THREAD); | |
354 } | |
355 } | |
356 } | |
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357 #endif // INCLUDE_JVMTI |
0 | 358 return NULL; |
359 } | |
360 | |
361 address NativeLookup::lookup_base(methodHandle method, bool& in_base_library, TRAPS) { | |
362 address entry = NULL; | |
363 ResourceMark rm(THREAD); | |
364 | |
365 entry = lookup_entry(method, in_base_library, THREAD); | |
366 if (entry != NULL) return entry; | |
367 | |
368 // standard native method resolution has failed. Check if there are any | |
369 // JVM TI prefixes which have been applied to the native method name. | |
370 entry = lookup_entry_prefixed(method, in_base_library, THREAD); | |
371 if (entry != NULL) return entry; | |
372 | |
373 // Native function not found, throw UnsatisfiedLinkError | |
374 THROW_MSG_0(vmSymbols::java_lang_UnsatisfiedLinkError(), | |
375 method->name_and_sig_as_C_string()); | |
376 } | |
377 | |
378 | |
379 address NativeLookup::lookup(methodHandle method, bool& in_base_library, TRAPS) { | |
380 if (!method->has_native_function()) { | |
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381 address entry = lookup_base(method, in_base_library, CHECK_NULL); |
0 | 382 method->set_native_function(entry, |
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383 Method::native_bind_event_is_interesting); |
0 | 384 // -verbose:jni printing |
385 if (PrintJNIResolving) { | |
386 ResourceMark rm(THREAD); | |
387 tty->print_cr("[Dynamic-linking native method %s.%s ... JNI]", | |
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388 method->method_holder()->external_name(), |
0 | 389 method->name()->as_C_string()); |
390 } | |
391 } | |
392 return method->native_function(); | |
393 } | |
394 | |
395 address NativeLookup::base_library_lookup(const char* class_name, const char* method_name, const char* signature) { | |
396 EXCEPTION_MARK; | |
397 bool in_base_library = true; // SharedRuntime inits some math methods. | |
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398 TempNewSymbol c_name = SymbolTable::new_symbol(class_name, CATCH); |
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399 TempNewSymbol m_name = SymbolTable::new_symbol(method_name, CATCH); |
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400 TempNewSymbol s_name = SymbolTable::new_symbol(signature, CATCH); |
0 | 401 |
402 // Find the class | |
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403 Klass* k = SystemDictionary::resolve_or_fail(c_name, true, CATCH); |
0 | 404 instanceKlassHandle klass (THREAD, k); |
405 | |
406 // Find method and invoke standard lookup | |
407 methodHandle method (THREAD, | |
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408 klass->uncached_lookup_method(m_name, s_name)); |
0 | 409 address result = lookup(method, in_base_library, CATCH); |
410 assert(in_base_library, "must be in basic library"); | |
411 guarantee(result != NULL, "must be non NULL"); | |
412 return result; | |
413 } |