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

 /*

  * Copyright 1997-2006 Sun Microsystems, Inc.  All Rights Reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  *

  */

 # include "incls/_precompiled.incl"

 # include "incls/_nativeLookup.cpp.incl"

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

   char* bytes = (char*)name->bytes() + begin;

   char* end_bytes = (char*)name->bytes() + end;

   while (bytes < end_bytes) {

     jchar c;

     bytes = UTF8::next(bytes, &c);

     if (c <= 0x7f && isalnum(c)) {

       st->put((char) c);

     } else {

            if (c == '_') st->print("_1");

       else if (c == '/') st->print("_");

       else if (c == ';') st->print("_2");

       else if (c == '[') st->print("_3");

       else               st->print("_%.5x", c);

     }

   }

 }

 static void mangle_name_on(outputStream* st, symbolOop name) {

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

 }

 char* NativeLookup::pure_jni_name(methodHandle method) {

   stringStream st;

   // Prefix

   st.print("Java_");

   // Klass name

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

   st.print("_");

   // Method name

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

   return st.as_string();

 }

 char* NativeLookup::long_jni_name(methodHandle method) {

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

   stringStream st;

   symbolOop signature = method->signature();

   st.print("__");

   // find ')'

   int end;

   for (end = 0; end < signature->utf8_length() && signature->byte_at(end) != ')'; end++);

   // skip first '('

   mangle_name_on(&st, signature, 1, end);

   return st.as_string();

 }

 extern "C" {

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

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

 }

 static address lookup_special_native(char* jni_name) {

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

   if (!JDK_Version::is_gte_jdk14x_version()) {

     // These functions only exist for compatibility with 1.3.1 and earlier

     // Intercept ObjectOutputStream getPrimitiveFieldValues for faster serialization

     if (strstr(jni_name, "Java_java_io_ObjectOutputStream_getPrimitiveFieldValues") != NULL) {

       return CAST_FROM_FN_PTR(address, JVM_GetPrimitiveFieldValues);

     }

     // Intercept ObjectInputStream setPrimitiveFieldValues for faster serialization

     if (strstr(jni_name, "Java_java_io_ObjectInputStream_setPrimitiveFieldValues") != NULL) {

       return CAST_FROM_FN_PTR(address, JVM_SetPrimitiveFieldValues);

     }

   }

   if (strstr(jni_name, "Java_sun_misc_Unsafe_registerNatives") != NULL) {

     return CAST_FROM_FN_PTR(address, JVM_RegisterUnsafeMethods);

   }

   if (strstr(jni_name, "Java_sun_misc_Perf_registerNatives") != NULL) {

     return CAST_FROM_FN_PTR(address, JVM_RegisterPerfMethods);

   }

   return NULL;

 }

 address NativeLookup::lookup_style(methodHandle method, char* pure_name, const char* long_name, int args_size, bool os_style, bool& in_base_library, TRAPS) {

   address entry;

   // Compute complete JNI name for style

   stringStream st;

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

   st.print_raw(pure_name);

   st.print_raw(long_name);

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

   char* jni_name = st.as_string();

   // If the loader is null we have a system class, so we attempt a lookup in

   // the native Java library. This takes care of any bootstrapping problems.

   // Note: It is critical for bootstrapping that Java_java_lang_ClassLoader_00024NativeLibrary_find

   // gets found the first time around - otherwise an infinite loop can occure. This is

   // another VM/library dependency

   Handle loader(THREAD,

                 instanceKlass::cast(method->method_holder())->class_loader());

   if (loader.is_null()) {

     entry = lookup_special_native(jni_name);

     if (entry == NULL) {

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

     }

     if (entry != NULL) {

       in_base_library = true;

       return entry;

     }

   }

   // Otherwise call static method findNative in ClassLoader

   KlassHandle   klass (THREAD, SystemDictionary::classloader_klass());

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

   JavaValue result(T_LONG);

   JavaCalls::call_static(&result,

                          klass,

                          vmSymbolHandles::findNative_name(),

                          vmSymbolHandles::classloader_string_long_signature(),

                          // Arguments

                          loader,

                          name_arg,

                          CHECK_NULL);

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

   if (entry == NULL) {

     // findNative didn't find it, if there are any agent libraries look in them

     AgentLibrary* agent;

     for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) {

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

       if (entry != NULL) {

         return entry;

       }

     }

   }

   return entry;

 }

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

 // for the specified method.

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

   address entry = NULL;

   in_base_library = false;

   // Compute pure name

   char* pure_name = pure_jni_name(method);

   // Compute argument size

   int args_size = 1                             // JNIEnv

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

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

   // 1) Try JNI short style

   entry = lookup_style(method, pure_name, "",        args_size, true,  in_base_library, CHECK_NULL);

   if (entry != NULL) return entry;

   // Compute long name

   char* long_name = long_jni_name(method);

   // 2) Try JNI long style

   entry = lookup_style(method, pure_name, long_name, args_size, true,  in_base_library, CHECK_NULL);

   if (entry != NULL) return entry;

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

   entry = lookup_style(method, pure_name, "",        args_size, false, in_base_library, CHECK_NULL);

   if (entry != NULL) return entry;

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

   entry = lookup_style(method, pure_name, long_name, args_size, false, in_base_library, CHECK_NULL);

   return entry; // NULL indicates not found

 }

 // Check if there are any JVM TI prefixes which have been applied to the native method name.

 // If any are found, remove them before attemping the look up of the

 // native implementation again.

 // See SetNativeMethodPrefix in the JVM TI Spec for more details.

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

   ResourceMark rm(THREAD);

   int prefix_count;

   char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);

   char* in_name = method->name()->as_C_string();

   char* wrapper_name = in_name;

   // last applied prefix will be first -- go backwards

   for (int i = prefix_count-1; i >= 0; i--) {

     char* prefix = prefixes[i];

     size_t prefix_len = strlen(prefix);

     if (strncmp(prefix, wrapper_name, prefix_len) == 0) {

       // has this prefix remove it

       wrapper_name += prefix_len;

     }

   }

   if (wrapper_name != in_name) {

     // we have a name for a wrapping method

     int wrapper_name_len = (int)strlen(wrapper_name);

     symbolHandle wrapper_symbol(THREAD, SymbolTable::probe(wrapper_name, wrapper_name_len));

     if (!wrapper_symbol.is_null()) {

       KlassHandle kh(method->method_holder());

       methodOop wrapper_method = Klass::cast(kh())->lookup_method(wrapper_symbol(),

                                                                   method->signature());

       if (wrapper_method != NULL && !wrapper_method->is_native()) {

         // we found a wrapper method, use its native entry

         method->set_is_prefixed_native();

         return lookup_entry(wrapper_method, in_base_library, THREAD);

       }

     }

   }

   return NULL;

 }

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

   address entry = NULL;

   ResourceMark rm(THREAD);

   entry = lookup_entry(method, in_base_library, THREAD);

   if (entry != NULL) return entry;

   // standard native method resolution has failed.  Check if there are any

   // JVM TI prefixes which have been applied to the native method name.

   entry = lookup_entry_prefixed(method, in_base_library, THREAD);

   if (entry != NULL) return entry;

   // Native function not found, throw UnsatisfiedLinkError

   THROW_MSG_0(vmSymbols::java_lang_UnsatisfiedLinkError(),

               method->name_and_sig_as_C_string());

 }

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

   if (!method->has_native_function()) {

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

     method->set_native_function(entry,

       methodOopDesc::native_bind_event_is_interesting);

     // -verbose:jni printing

     if (PrintJNIResolving) {

       ResourceMark rm(THREAD);

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

         Klass::cast(method->method_holder())->external_name(),

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

     }

   }

   return method->native_function();

 }

 address NativeLookup::base_library_lookup(const char* class_name, const char* method_name, const char* signature) {

   EXCEPTION_MARK;

   bool in_base_library = true;  // SharedRuntime inits some math methods.

   symbolHandle c_name = oopFactory::new_symbol_handle(class_name,  CATCH);

   symbolHandle m_name = oopFactory::new_symbol_handle(method_name, CATCH);

   symbolHandle s_name = oopFactory::new_symbol_handle(signature,   CATCH);

   // Find the class

   klassOop k = SystemDictionary::resolve_or_fail(c_name, true, CATCH);

   instanceKlassHandle klass (THREAD, k);

   // Find method and invoke standard lookup

   methodHandle method (THREAD,

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

   address result = lookup(method, in_base_library, CATCH);

   assert(in_base_library, "must be in basic library");

   guarantee(result != NULL, "must be non NULL");

   return result;

 }