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

 /*

  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "classfile/javaClasses.hpp"

 #include "classfile/systemDictionary.hpp"

 #include "classfile/vmSymbols.hpp"

 #include "memory/oopFactory.hpp"

 #include "memory/resourceArea.hpp"

 #include "memory/universe.inline.hpp"

 #include "oops/instanceKlass.hpp"

 #include "oops/method.hpp"

 #include "oops/oop.inline.hpp"

 #include "oops/symbol.hpp"

 #include "prims/jvm_misc.hpp"

 #include "prims/nativeLookup.hpp"

 #include "runtime/arguments.hpp"

 #include "runtime/handles.inline.hpp"

 #include "runtime/javaCalls.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "runtime/signature.hpp"

 #include "utilities/macros.hpp"

 #if INCLUDE_JFR

 #include "jfr/jfr.hpp"

 #endif

 #ifdef TARGET_OS_FAMILY_linux

 # include "os_linux.inline.hpp"

 #endif

 #ifdef TARGET_OS_FAMILY_solaris

 # include "os_solaris.inline.hpp"

 #endif

 #ifdef TARGET_OS_FAMILY_windows

 # include "os_windows.inline.hpp"

 #endif

 #ifdef TARGET_OS_FAMILY_aix

 # include "os_aix.inline.hpp"

 #endif

 #ifdef TARGET_OS_FAMILY_bsd

 # include "os_bsd.inline.hpp"

 #endif

 static void mangle_name_on(outputStream* st, Symbol* 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, Symbol* 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::critical_jni_name(methodHandle method) {

   stringStream st;

   // Prefix

   st.print("JavaCritical_");

   // 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;

   Symbol* 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_RegisterMethodHandleMethods(JNIEnv *env, jclass unsafecls);

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

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

 }

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

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

 static JNINativeMethod lookup_special_native_methods[] = {

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

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

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

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

 #if INCLUDE_JFR

   { CC"Java_jdk_jfr_internal_JVM_registerNatives",                 NULL, FN_PTR(jfr_register_natives)            },

 #endif

 };

 static address lookup_special_native(char* jni_name) {

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

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

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

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

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

     }

   }

   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, method->method_holder()->class_loader());

   if (loader.is_null()) {

     entry = lookup_special_native(jni_name);

     if (entry == NULL) {

        entry = (address) os::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,

                          vmSymbols::findNative_name(),

                          vmSymbols::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) os::dll_lookup(agent->os_lib(), jni_name);

       if (entry != NULL) {

         return entry;

       }

     }

   }

   return entry;

 }

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

   if (!method->has_native_function()) {

     return NULL;

   }

   address current_entry = method->native_function();

   char dll_name[JVM_MAXPATHLEN];

   int offset;

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

     char ebuf[32];

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

     if (dll != NULL) {

       // 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();

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

     }

   }

   return NULL;

 }

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

 // for the specified method.

 address NativeLookup::lookup_critical_entry(methodHandle method) {

   if (!CriticalJNINatives) return NULL;

   if (method->is_synchronized() ||

       !method->is_static()) {

     // Only static non-synchronized methods are allowed

     return NULL;

   }

   ResourceMark rm;

   address entry = NULL;

   Symbol* signature = method->signature();

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

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

       // Don't allow object types

       return NULL;

     }

   }

   // Compute critical name

   char* critical_name = critical_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_critical_style(method, critical_name, "",        args_size, true);

   if (entry != NULL) return entry;

   // Compute long name

   char* long_name = long_jni_name(method);

   // 2) Try JNI long style

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

   if (entry != NULL) return entry;

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

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

   if (entry != NULL) return entry;

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

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

   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) {

 #if INCLUDE_JVMTI

   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);

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

     if (wrapper_symbol != NULL) {

       KlassHandle kh(method->method_holder());

       Method* wrapper_method = 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);

       }

     }

   }

 #endif // INCLUDE_JVMTI

   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,

       Method::native_bind_event_is_interesting);

     // -verbose:jni printing

     if (PrintJNIResolving) {

       ResourceMark rm(THREAD);

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

         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.

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

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

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

   // Find the class

   Klass* 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, Klass::find_overpass));

   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;

 }