jdk8-mips64-public/hotspot: src/share/vm/prims/nativeLookup.cpp@833b0f92429a

8046598: Scalable Native memory tracking development
Summary: Enhance scalability of native memory tracking
Reviewed-by: coleenp, ctornqvi, gtriantafill

     1 /*

     2  * Copyright (c) 1997, 2014, 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_aix

    54 # include "os_aix.inline.hpp"

    55 #endif

    56 #ifdef TARGET_OS_FAMILY_bsd

    57 # include "os_bsd.inline.hpp"

    58 #endif

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

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

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

    64   while (bytes < end_bytes) {

    65     jchar c;

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

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

    68       st->put((char) c);

    69     } else {

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

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

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

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

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

    75     }

    76   }

    77 }

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

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

    82 }

    85 char* NativeLookup::pure_jni_name(methodHandle method) {

    86   stringStream st;

    87   // Prefix

    88   st.print("Java_");

    89   // Klass name

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

    91   st.print("_");

    92   // Method name

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

    94   return st.as_string();

    95 }

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

    99   stringStream st;

   100   // Prefix

   101   st.print("JavaCritical_");

   102   // Klass name

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

   104   st.print("_");

   105   // Method name

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

   107   return st.as_string();

   108 }

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

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

   113   stringStream st;

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

   115   st.print("__");

   116   // find ')'

   117   int end;

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

   119   // skip first '('

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

   121   return st.as_string();

   122 }

   124 extern "C" {

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

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

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

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

   129 }

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

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

   134 static JNINativeMethod lookup_special_native_methods[] = {

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

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

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

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

   139 };

   141 static address lookup_special_native(char* jni_name) {

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

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

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

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

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

   147     }

   148   }

   149   return NULL;

   150 }

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

   153   address entry;

   154   // Compute complete JNI name for style

   155   stringStream st;

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

   157   st.print_raw(pure_name);

   158   st.print_raw(long_name);

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

   160   char* jni_name = st.as_string();

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

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

   164   // Note: It is critical for bootstrapping that Java_java_lang_ClassLoader_00024NativeLibrary_find

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

   166   // another VM/library dependency

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

   168   if (loader.is_null()) {

   169     entry = lookup_special_native(jni_name);

   170     if (entry == NULL) {

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

   172     }

   173     if (entry != NULL) {

   174       in_base_library = true;

   175       return entry;

   176     }

   177   }

   179   // Otherwise call static method findNative in ClassLoader

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

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

   183   JavaValue result(T_LONG);

   184   JavaCalls::call_static(&result,

   185                          klass,

   186                          vmSymbols::findNative_name(),

   187                          vmSymbols::classloader_string_long_signature(),

   188                          // Arguments

   189                          loader,

   190                          name_arg,

   191                          CHECK_NULL);

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

   194   if (entry == NULL) {

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

   196     AgentLibrary* agent;

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

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

   199       if (entry != NULL) {

   200         return entry;

   201       }

   202     }

   203   }

   205   return entry;

   206 }

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

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

   211     return NULL;

   212   }

   214   address current_entry = method->native_function();

   216   char dll_name[JVM_MAXPATHLEN];

   217   int offset;

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

   219     char ebuf[32];

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

   221     if (dll != NULL) {

   222       // Compute complete JNI name for style

   223       stringStream st;

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

   225       st.print_raw(pure_name);

   226       st.print_raw(long_name);

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

   228       char* jni_name = st.as_string();

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

   230     }

   231   }

   233   return NULL;

   234 }

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

   238 // for the specified method.

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

   240   address entry = NULL;

   241   in_base_library = false;

   242   // Compute pure name

   243   char* pure_name = pure_jni_name(method);

   245   // Compute argument size

   246   int args_size = 1                             // JNIEnv

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

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

   251   // 1) Try JNI short style

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

   253   if (entry != NULL) return entry;

   255   // Compute long name

   256   char* long_name = long_jni_name(method);

   258   // 2) Try JNI long style

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

   260   if (entry != NULL) return entry;

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

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

   264   if (entry != NULL) return entry;

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

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

   269   return entry; // NULL indicates not found

   270 }

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

   273 // for the specified method.

   274 address NativeLookup::lookup_critical_entry(methodHandle method) {

   275   if (!CriticalJNINatives) return NULL;

   277   if (method->is_synchronized() ||

   278       !method->is_static()) {

   279     // Only static non-synchronized methods are allowed

   280     return NULL;

   281   }

   283   ResourceMark rm;

   284   address entry = NULL;

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

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

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

   289       // Don't allow object types

   290       return NULL;

   291     }

   292   }

   294   // Compute critical name

   295   char* critical_name = critical_jni_name(method);

   297   // Compute argument size

   298   int args_size = 1                             // JNIEnv

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

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

   303   // 1) Try JNI short style

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

   305   if (entry != NULL) return entry;

   307   // Compute long name

   308   char* long_name = long_jni_name(method);

   310   // 2) Try JNI long style

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

   312   if (entry != NULL) return entry;

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

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

   316   if (entry != NULL) return entry;

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

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

   321   return entry; // NULL indicates not found

   322 }

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

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

   326 // native implementation again.

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

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

   329 #if INCLUDE_JVMTI

   330   ResourceMark rm(THREAD);

   332   int prefix_count;

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

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

   335   char* wrapper_name = in_name;

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

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

   338     char* prefix = prefixes[i];

   339     size_t prefix_len = strlen(prefix);

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

   341       // has this prefix remove it

   342       wrapper_name += prefix_len;

   343     }

   344   }

   345   if (wrapper_name != in_name) {

   346     // we have a name for a wrapping method

   347     int wrapper_name_len = (int)strlen(wrapper_name);

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

   349     if (wrapper_symbol != NULL) {

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

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

   352                                                                   method->signature());

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

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

   355         method->set_is_prefixed_native();

   356         return lookup_entry(wrapper_method, in_base_library, THREAD);

   357       }

   358     }

   359   }

   360 #endif // INCLUDE_JVMTI

   361   return NULL;

   362 }

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

   365   address entry = NULL;

   366   ResourceMark rm(THREAD);

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

   369   if (entry != NULL) return entry;

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

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

   373   entry = lookup_entry_prefixed(method, in_base_library, THREAD);

   374   if (entry != NULL) return entry;

   376   // Native function not found, throw UnsatisfiedLinkError

   377   THROW_MSG_0(vmSymbols::java_lang_UnsatisfiedLinkError(),

   378               method->name_and_sig_as_C_string());

   379 }

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

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

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

   385     method->set_native_function(entry,

   386       Method::native_bind_event_is_interesting);

   387     // -verbose:jni printing

   388     if (PrintJNIResolving) {

   389       ResourceMark rm(THREAD);

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

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

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

   393     }

   394   }

   395   return method->native_function();

   396 }

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

   399   EXCEPTION_MARK;

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

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

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

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

   405   // Find the class

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

   407   instanceKlassHandle klass (THREAD, k);

   409   // Find method and invoke standard lookup

   410   methodHandle method (THREAD,

   411                        klass->uncached_lookup_method(m_name, s_name, Klass::normal));

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

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

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

   415   return result;

   416 }

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

src/share/vm/prims/nativeLookup.cpp@833b0f92429a

src/share/vm/prims/nativeLookup.cpp