Mercurial > hg > truffle
view src/share/vm/prims/nativeLookup.cpp @ 452:00b023ae2d78
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
Summary: When we encounter marking stack overflow during precleaning of Reference lists, we were using the overflow list mechanism, which can cause problems on account of mutating the mark word of the header because of conflicts with mutator accesses and updates of that field. Instead we should use the usual mechanism for overflow handling in concurrent phases, namely dirtying of the card on which the overflowed object lies. Since precleaning effectively does a form of discovered list processing, albeit with discovery enabled, we needed to adjust some code to be correct in the face of interleaved processing and discovery.
Reviewed-by: apetrusenko, jcoomes
author | ysr |
---|---|
date | Thu, 20 Nov 2008 12:27:41 -0800 |
parents | a61af66fc99e |
children | e5b0439ef4ae |
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/* * 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; }