jdk8-mips64-public/hotspot: src/share/vm/prims/nativeLookup.cpp@fd07a7e4222b

     1 /*

     2  * Copyright (c) 1997, 2013, 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  */

    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/method.hpp"

    34 #include "oops/oop.inline.hpp"

    35 #include "oops/symbol.hpp"

    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 #include "utilities/macros.hpp"

    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

    53 #ifdef TARGET_OS_FAMILY_bsd

    54 # include "os_bsd.inline.hpp"

    55 #endif

    58 static void mangle_name_on(outputStream* st, Symbol* name, int begin, int end) {

    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 }

    77 static void mangle_name_on(outputStream* st, Symbol* name) {

    78   mangle_name_on(st, name, 0, name->utf8_length());

    79 }

    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 }

    95 char* NativeLookup::critical_jni_name(methodHandle method) {

    96   stringStream st;

    97   // Prefix

    98   st.print("JavaCritical_");

    99   // Klass name

   100   mangle_name_on(&st, method->klass_name());

   101   st.print("_");

   102   // Method name

   103   mangle_name_on(&st, method->name());

   104   return st.as_string();

   105 }

   108 char* NativeLookup::long_jni_name(methodHandle method) {

   109   // Signature ignore the wrapping parenteses and the trailing return type

   110   stringStream st;

   111   Symbol* signature = method->signature();

   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 }

   121 extern "C" {

   122   void JNICALL JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls);

   123   void JNICALL JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass unsafecls);

   124   void JNICALL JVM_RegisterPerfMethods(JNIEnv *env, jclass perfclass);

   125   void JNICALL JVM_RegisterWhiteBoxMethods(JNIEnv *env, jclass wbclass);

   126 }

   128 #define CC (char*)  /* cast a literal from (const char*) */

   129 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)

   131 static JNINativeMethod lookup_special_native_methods[] = {

   132   { CC"Java_sun_misc_Unsafe_registerNatives",                      NULL, FN_PTR(JVM_RegisterUnsafeMethods)       },

   133   { CC"Java_java_lang_invoke_MethodHandleNatives_registerNatives", NULL, FN_PTR(JVM_RegisterMethodHandleMethods) },

   134   { CC"Java_sun_misc_Perf_registerNatives",                        NULL, FN_PTR(JVM_RegisterPerfMethods)         },

   135   { CC"Java_sun_hotspot_WhiteBox_registerNatives",                 NULL, FN_PTR(JVM_RegisterWhiteBoxMethods)     },

   136 };

   138 static address lookup_special_native(char* jni_name) {

   139   int count = sizeof(lookup_special_native_methods) / sizeof(JNINativeMethod);

   140   for (int i = 0; i < count; i++) {

   141     // NB: To ignore the jni prefix and jni postfix strstr is used matching.

   142     if (strstr(jni_name, lookup_special_native_methods[i].name) != NULL) {

   143       return CAST_FROM_FN_PTR(address, lookup_special_native_methods[i].fnPtr);

   144     }

   145   }

   146   return NULL;

   147 }

   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();

   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

   164   Handle loader(THREAD, method->method_holder()->class_loader());

   165   if (loader.is_null()) {

   166     entry = lookup_special_native(jni_name);

   167     if (entry == NULL) {

   168        entry = (address) os::dll_lookup(os::native_java_library(), jni_name);

   169     }

   170     if (entry != NULL) {

   171       in_base_library = true;

   172       return entry;

   173     }

   174   }

   176   // Otherwise call static method findNative in ClassLoader

   177   KlassHandle   klass (THREAD, SystemDictionary::ClassLoader_klass());

   178   Handle name_arg = java_lang_String::create_from_str(jni_name, CHECK_NULL);

   180   JavaValue result(T_LONG);

   181   JavaCalls::call_static(&result,

   182                          klass,

   183                          vmSymbols::findNative_name(),

   184                          vmSymbols::classloader_string_long_signature(),

   185                          // Arguments

   186                          loader,

   187                          name_arg,

   188                          CHECK_NULL);

   189   entry = (address) (intptr_t) result.get_jlong();

   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()) {

   195       entry = (address) os::dll_lookup(agent->os_lib(), jni_name);

   196       if (entry != NULL) {

   197         return entry;

   198       }

   199     }

   200   }

   202   return entry;

   203 }

   206 address NativeLookup::lookup_critical_style(methodHandle method, char* pure_name, const char* long_name, int args_size, bool os_style) {

   207   if (!method->has_native_function()) {

   208     return NULL;

   209   }

   211   address current_entry = method->native_function();

   213   char dll_name[JVM_MAXPATHLEN];

   214   int offset;

   215   if (os::dll_address_to_library_name(current_entry, dll_name, sizeof(dll_name), &offset)) {

   216     char ebuf[32];

   217     void* dll = os::dll_load(dll_name, ebuf, sizeof(ebuf));

   218     if (dll != NULL) {

   219       // Compute complete JNI name for style

   220       stringStream st;

   221       if (os_style) os::print_jni_name_prefix_on(&st, args_size);

   222       st.print_raw(pure_name);

   223       st.print_raw(long_name);

   224       if (os_style) os::print_jni_name_suffix_on(&st, args_size);

   225       char* jni_name = st.as_string();

   226       return (address)os::dll_lookup(dll, jni_name);

   227     }

   228   }

   230   return NULL;

   231 }

   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);

   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

   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;

   252   // Compute long name

   253   char* long_name = long_jni_name(method);

   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;

   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;

   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);

   266   return entry; // NULL indicates not found

   267 }

   269 // Check all the formats of native implementation name to see if there is one

   270 // for the specified method.

   271 address NativeLookup::lookup_critical_entry(methodHandle method) {

   272   if (!CriticalJNINatives) return NULL;

   274   if (method->is_synchronized() ||

   275       !method->is_static()) {

   276     // Only static non-synchronized methods are allowed

   277     return NULL;

   278   }

   280   ResourceMark rm;

   281   address entry = NULL;

   283   Symbol* signature = method->signature();

   284   for (int end = 0; end < signature->utf8_length(); end++) {

   285     if (signature->byte_at(end) == 'L') {

   286       // Don't allow object types

   287       return NULL;

   288     }

   289   }

   291   // Compute critical name

   292   char* critical_name = critical_jni_name(method);

   294   // Compute argument size

   295   int args_size = 1                             // JNIEnv

   296                 + (method->is_static() ? 1 : 0) // class for static methods

   297                 + method->size_of_parameters(); // actual parameters

   300   // 1) Try JNI short style

   301   entry = lookup_critical_style(method, critical_name, "",        args_size, true);

   302   if (entry != NULL) return entry;

   304   // Compute long name

   305   char* long_name = long_jni_name(method);

   307   // 2) Try JNI long style

   308   entry = lookup_critical_style(method, critical_name, long_name, args_size, true);

   309   if (entry != NULL) return entry;

   311   // 3) Try JNI short style without os prefix/suffix

   312   entry = lookup_critical_style(method, critical_name, "",        args_size, false);

   313   if (entry != NULL) return entry;

   315   // 4) Try JNI long style without os prefix/suffix

   316   entry = lookup_critical_style(method, critical_name, long_name, args_size, false);

   318   return entry; // NULL indicates not found

   319 }

   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) {

   326 #if INCLUDE_JVMTI

   327   ResourceMark rm(THREAD);

   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);

   345     TempNewSymbol wrapper_symbol = SymbolTable::probe(wrapper_name, wrapper_name_len);

   346     if (wrapper_symbol != NULL) {

   347       KlassHandle kh(method->method_holder());

   348       Method* wrapper_method = kh()->lookup_method(wrapper_symbol,

   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   }

   357 #endif // INCLUDE_JVMTI

   358   return NULL;

   359 }

   361 address NativeLookup::lookup_base(methodHandle method, bool& in_base_library, TRAPS) {

   362   address entry = NULL;

   363   ResourceMark rm(THREAD);

   365   entry = lookup_entry(method, in_base_library, THREAD);

   366   if (entry != NULL) return entry;

   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;

   373   // Native function not found, throw UnsatisfiedLinkError

   374   THROW_MSG_0(vmSymbols::java_lang_UnsatisfiedLinkError(),

   375               method->name_and_sig_as_C_string());

   376 }

   379 address NativeLookup::lookup(methodHandle method, bool& in_base_library, TRAPS) {

   380   if (!method->has_native_function()) {

   381     address entry = lookup_base(method, in_base_library, CHECK_NULL);

   382     method->set_native_function(entry,

   383       Method::native_bind_event_is_interesting);

   384     // -verbose:jni printing

   385     if (PrintJNIResolving) {

   386       ResourceMark rm(THREAD);

   387       tty->print_cr("[Dynamic-linking native method %s.%s ... JNI]",

   388         method->method_holder()->external_name(),

   389         method->name()->as_C_string());

   390     }

   391   }

   392   return method->native_function();

   393 }

   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.

   398   TempNewSymbol c_name = SymbolTable::new_symbol(class_name,  CATCH);

   399   TempNewSymbol m_name = SymbolTable::new_symbol(method_name, CATCH);

   400   TempNewSymbol s_name = SymbolTable::new_symbol(signature,   CATCH);

   402   // Find the class

   403   Klass* k = SystemDictionary::resolve_or_fail(c_name, true, CATCH);

   404   instanceKlassHandle klass (THREAD, k);

   406   // Find method and invoke standard lookup

   407   methodHandle method (THREAD,

   408                        klass->uncached_lookup_method(m_name, s_name));

   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 }

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/prims/nativeLookup.cpp@fd07a7e4222b

src/share/vm/prims/nativeLookup.cpp