src/share/vm/prims/nativeLookup.cpp

Tue, 23 Nov 2010 13:22:55 -0800

author
stefank
date
Tue, 23 Nov 2010 13:22:55 -0800
changeset 2314
f95d63e2154a
parent 1907
c18cbe5936b8
child 2322
828eafbd85cc
permissions
-rw-r--r--

6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg

     1 /*
     2  * Copyright (c) 1997, 2010, 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/methodOop.hpp"
    34 #include "oops/oop.inline.hpp"
    35 #include "oops/symbolOop.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/hpi.hpp"
    41 #include "runtime/javaCalls.hpp"
    42 #include "runtime/sharedRuntime.hpp"
    43 #include "runtime/signature.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
    55 static void mangle_name_on(outputStream* st, symbolOop name, int begin, int end) {
    56   char* bytes = (char*)name->bytes() + begin;
    57   char* end_bytes = (char*)name->bytes() + end;
    58   while (bytes < end_bytes) {
    59     jchar c;
    60     bytes = UTF8::next(bytes, &c);
    61     if (c <= 0x7f && isalnum(c)) {
    62       st->put((char) c);
    63     } else {
    64            if (c == '_') st->print("_1");
    65       else if (c == '/') st->print("_");
    66       else if (c == ';') st->print("_2");
    67       else if (c == '[') st->print("_3");
    68       else               st->print("_%.5x", c);
    69     }
    70   }
    71 }
    74 static void mangle_name_on(outputStream* st, symbolOop name) {
    75   mangle_name_on(st, name, 0, name->utf8_length());
    76 }
    79 char* NativeLookup::pure_jni_name(methodHandle method) {
    80   stringStream st;
    81   // Prefix
    82   st.print("Java_");
    83   // Klass name
    84   mangle_name_on(&st, method->klass_name());
    85   st.print("_");
    86   // Method name
    87   mangle_name_on(&st, method->name());
    88   return st.as_string();
    89 }
    92 char* NativeLookup::long_jni_name(methodHandle method) {
    93   // Signature ignore the wrapping parenteses and the trailing return type
    94   stringStream st;
    95   symbolOop signature = method->signature();
    96   st.print("__");
    97   // find ')'
    98   int end;
    99   for (end = 0; end < signature->utf8_length() && signature->byte_at(end) != ')'; end++);
   100   // skip first '('
   101   mangle_name_on(&st, signature, 1, end);
   102   return st.as_string();
   103 }
   105 extern "C" {
   106   void JNICALL JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls);
   107   void JNICALL JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass unsafecls);
   108   void JNICALL JVM_RegisterPerfMethods(JNIEnv *env, jclass perfclass);
   109 }
   111 static address lookup_special_native(char* jni_name) {
   112   // NB: To ignore the jni prefix and jni postfix strstr is used matching.
   113   if (!JDK_Version::is_gte_jdk14x_version()) {
   114     // These functions only exist for compatibility with 1.3.1 and earlier
   115     // Intercept ObjectOutputStream getPrimitiveFieldValues for faster serialization
   116     if (strstr(jni_name, "Java_java_io_ObjectOutputStream_getPrimitiveFieldValues") != NULL) {
   117       return CAST_FROM_FN_PTR(address, JVM_GetPrimitiveFieldValues);
   118     }
   119     // Intercept ObjectInputStream setPrimitiveFieldValues for faster serialization
   120     if (strstr(jni_name, "Java_java_io_ObjectInputStream_setPrimitiveFieldValues") != NULL) {
   121       return CAST_FROM_FN_PTR(address, JVM_SetPrimitiveFieldValues);
   122     }
   123   }
   124   if (strstr(jni_name, "Java_sun_misc_Unsafe_registerNatives") != NULL) {
   125     return CAST_FROM_FN_PTR(address, JVM_RegisterUnsafeMethods);
   126   }
   127   if (strstr(jni_name, "Java_sun_dyn_MethodHandleNatives_registerNatives") != NULL) {
   128     return CAST_FROM_FN_PTR(address, JVM_RegisterMethodHandleMethods);
   129   }
   130   if (strstr(jni_name, "Java_sun_misc_Perf_registerNatives") != NULL) {
   131     return CAST_FROM_FN_PTR(address, JVM_RegisterPerfMethods);
   132   }
   134   return NULL;
   135 }
   137 address NativeLookup::lookup_style(methodHandle method, char* pure_name, const char* long_name, int args_size, bool os_style, bool& in_base_library, TRAPS) {
   138   address entry;
   139   // Compute complete JNI name for style
   140   stringStream st;
   141   if (os_style) os::print_jni_name_prefix_on(&st, args_size);
   142   st.print_raw(pure_name);
   143   st.print_raw(long_name);
   144   if (os_style) os::print_jni_name_suffix_on(&st, args_size);
   145   char* jni_name = st.as_string();
   147   // If the loader is null we have a system class, so we attempt a lookup in
   148   // the native Java library. This takes care of any bootstrapping problems.
   149   // Note: It is critical for bootstrapping that Java_java_lang_ClassLoader_00024NativeLibrary_find
   150   // gets found the first time around - otherwise an infinite loop can occure. This is
   151   // another VM/library dependency
   152   Handle loader(THREAD,
   153                 instanceKlass::cast(method->method_holder())->class_loader());
   154   if (loader.is_null()) {
   155     entry = lookup_special_native(jni_name);
   156     if (entry == NULL) {
   157        entry = (address) hpi::dll_lookup(os::native_java_library(), jni_name);
   158     }
   159     if (entry != NULL) {
   160       in_base_library = true;
   161       return entry;
   162     }
   163   }
   165   // Otherwise call static method findNative in ClassLoader
   166   KlassHandle   klass (THREAD, SystemDictionary::ClassLoader_klass());
   167   Handle name_arg = java_lang_String::create_from_str(jni_name, CHECK_NULL);
   169   JavaValue result(T_LONG);
   170   JavaCalls::call_static(&result,
   171                          klass,
   172                          vmSymbolHandles::findNative_name(),
   173                          vmSymbolHandles::classloader_string_long_signature(),
   174                          // Arguments
   175                          loader,
   176                          name_arg,
   177                          CHECK_NULL);
   178   entry = (address) (intptr_t) result.get_jlong();
   180   if (entry == NULL) {
   181     // findNative didn't find it, if there are any agent libraries look in them
   182     AgentLibrary* agent;
   183     for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) {
   184       entry = (address) hpi::dll_lookup(agent->os_lib(), jni_name);
   185       if (entry != NULL) {
   186         return entry;
   187       }
   188     }
   189   }
   191   return entry;
   192 }
   195 // Check all the formats of native implementation name to see if there is one
   196 // for the specified method.
   197 address NativeLookup::lookup_entry(methodHandle method, bool& in_base_library, TRAPS) {
   198   address entry = NULL;
   199   in_base_library = false;
   200   // Compute pure name
   201   char* pure_name = pure_jni_name(method);
   203   // Compute argument size
   204   int args_size = 1                             // JNIEnv
   205                 + (method->is_static() ? 1 : 0) // class for static methods
   206                 + method->size_of_parameters(); // actual parameters
   209   // 1) Try JNI short style
   210   entry = lookup_style(method, pure_name, "",        args_size, true,  in_base_library, CHECK_NULL);
   211   if (entry != NULL) return entry;
   213   // Compute long name
   214   char* long_name = long_jni_name(method);
   216   // 2) Try JNI long style
   217   entry = lookup_style(method, pure_name, long_name, args_size, true,  in_base_library, CHECK_NULL);
   218   if (entry != NULL) return entry;
   220   // 3) Try JNI short style without os prefix/suffix
   221   entry = lookup_style(method, pure_name, "",        args_size, false, in_base_library, CHECK_NULL);
   222   if (entry != NULL) return entry;
   224   // 4) Try JNI long style without os prefix/suffix
   225   entry = lookup_style(method, pure_name, long_name, args_size, false, in_base_library, CHECK_NULL);
   227   return entry; // NULL indicates not found
   228 }
   230 // Check if there are any JVM TI prefixes which have been applied to the native method name.
   231 // If any are found, remove them before attemping the look up of the
   232 // native implementation again.
   233 // See SetNativeMethodPrefix in the JVM TI Spec for more details.
   234 address NativeLookup::lookup_entry_prefixed(methodHandle method, bool& in_base_library, TRAPS) {
   235   ResourceMark rm(THREAD);
   237   int prefix_count;
   238   char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
   239   char* in_name = method->name()->as_C_string();
   240   char* wrapper_name = in_name;
   241   // last applied prefix will be first -- go backwards
   242   for (int i = prefix_count-1; i >= 0; i--) {
   243     char* prefix = prefixes[i];
   244     size_t prefix_len = strlen(prefix);
   245     if (strncmp(prefix, wrapper_name, prefix_len) == 0) {
   246       // has this prefix remove it
   247       wrapper_name += prefix_len;
   248     }
   249   }
   250   if (wrapper_name != in_name) {
   251     // we have a name for a wrapping method
   252     int wrapper_name_len = (int)strlen(wrapper_name);
   253     symbolHandle wrapper_symbol(THREAD, SymbolTable::probe(wrapper_name, wrapper_name_len));
   254     if (!wrapper_symbol.is_null()) {
   255       KlassHandle kh(method->method_holder());
   256       methodOop wrapper_method = Klass::cast(kh())->lookup_method(wrapper_symbol(),
   257                                                                   method->signature());
   258       if (wrapper_method != NULL && !wrapper_method->is_native()) {
   259         // we found a wrapper method, use its native entry
   260         method->set_is_prefixed_native();
   261         return lookup_entry(wrapper_method, in_base_library, THREAD);
   262       }
   263     }
   264   }
   265   return NULL;
   266 }
   268 address NativeLookup::lookup_base(methodHandle method, bool& in_base_library, TRAPS) {
   269   address entry = NULL;
   270   ResourceMark rm(THREAD);
   272   entry = lookup_entry(method, in_base_library, THREAD);
   273   if (entry != NULL) return entry;
   275   // standard native method resolution has failed.  Check if there are any
   276   // JVM TI prefixes which have been applied to the native method name.
   277   entry = lookup_entry_prefixed(method, in_base_library, THREAD);
   278   if (entry != NULL) return entry;
   280   // Native function not found, throw UnsatisfiedLinkError
   281   THROW_MSG_0(vmSymbols::java_lang_UnsatisfiedLinkError(),
   282               method->name_and_sig_as_C_string());
   283 }
   286 address NativeLookup::lookup(methodHandle method, bool& in_base_library, TRAPS) {
   287   if (!method->has_native_function()) {
   288     address entry = lookup_base(method, in_base_library, CHECK_NULL);
   289     method->set_native_function(entry,
   290       methodOopDesc::native_bind_event_is_interesting);
   291     // -verbose:jni printing
   292     if (PrintJNIResolving) {
   293       ResourceMark rm(THREAD);
   294       tty->print_cr("[Dynamic-linking native method %s.%s ... JNI]",
   295         Klass::cast(method->method_holder())->external_name(),
   296         method->name()->as_C_string());
   297     }
   298   }
   299   return method->native_function();
   300 }
   302 address NativeLookup::base_library_lookup(const char* class_name, const char* method_name, const char* signature) {
   303   EXCEPTION_MARK;
   304   bool in_base_library = true;  // SharedRuntime inits some math methods.
   305   symbolHandle c_name = oopFactory::new_symbol_handle(class_name,  CATCH);
   306   symbolHandle m_name = oopFactory::new_symbol_handle(method_name, CATCH);
   307   symbolHandle s_name = oopFactory::new_symbol_handle(signature,   CATCH);
   309   // Find the class
   310   klassOop k = SystemDictionary::resolve_or_fail(c_name, true, CATCH);
   311   instanceKlassHandle klass (THREAD, k);
   313   // Find method and invoke standard lookup
   314   methodHandle method (THREAD,
   315                        klass->uncached_lookup_method(m_name(), s_name()));
   316   address result = lookup(method, in_base_library, CATCH);
   317   assert(in_base_library, "must be in basic library");
   318   guarantee(result != NULL, "must be non NULL");
   319   return result;
   320 }

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