/* * Copyright (c) 1997, 2016, 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/classFileStream.hpp" #include "classfile/classLoader.hpp" #include "classfile/classLoaderData.inline.hpp" #include "classfile/javaAssertions.hpp" #include "classfile/javaClasses.inline.hpp" #include "classfile/moduleEntry.hpp" #include "classfile/modules.hpp" #include "classfile/packageEntry.hpp" #include "classfile/stringTable.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/vmSymbols.hpp" #include "gc/shared/barrierSet.inline.hpp" #include "gc/shared/collectedHeap.inline.hpp" #include "interpreter/bytecode.hpp" #include "memory/oopFactory.hpp" #include "memory/resourceArea.hpp" #include "memory/universe.inline.hpp" #include "oops/fieldStreams.hpp" #include "oops/instanceKlass.hpp" #include "oops/method.hpp" #include "oops/objArrayKlass.hpp" #include "oops/objArrayOop.inline.hpp" #include "oops/oop.inline.hpp" #include "prims/jvm.h" #include "prims/jvm_misc.hpp" #include "prims/jvmtiExport.hpp" #include "prims/jvmtiThreadState.hpp" #include "prims/nativeLookup.hpp" #include "prims/privilegedStack.hpp" #include "prims/stackwalk.hpp" #include "runtime/arguments.hpp" #include "runtime/atomic.hpp" #include "runtime/handles.inline.hpp" #include "runtime/init.hpp" #include "runtime/interfaceSupport.hpp" #include "runtime/java.hpp" #include "runtime/javaCalls.hpp" #include "runtime/jfieldIDWorkaround.hpp" #include "runtime/orderAccess.inline.hpp" #include "runtime/os.inline.hpp" #include "runtime/perfData.hpp" #include "runtime/reflection.hpp" #include "runtime/thread.inline.hpp" #include "runtime/vframe.hpp" #include "runtime/vm_operations.hpp" #include "runtime/vm_version.hpp" #include "services/attachListener.hpp" #include "services/management.hpp" #include "services/threadService.hpp" #include "trace/tracing.hpp" #include "utilities/copy.hpp" #include "utilities/defaultStream.hpp" #include "utilities/dtrace.hpp" #include "utilities/events.hpp" #include "utilities/histogram.hpp" #include "utilities/macros.hpp" #include "utilities/utf8.hpp" #if INCLUDE_CDS #include "classfile/sharedClassUtil.hpp" #include "classfile/systemDictionaryShared.hpp" #endif #include /* NOTE about use of any ctor or function call that can trigger a safepoint/GC: such ctors and calls MUST NOT come between an oop declaration/init and its usage because if objects are move this may cause various memory stomps, bus errors and segfaults. Here is a cookbook for causing so called "naked oop failures": JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields { JVMWrapper("JVM_GetClassDeclaredFields"); // Object address to be held directly in mirror & not visible to GC oop mirror = JNIHandles::resolve_non_null(ofClass); // If this ctor can hit a safepoint, moving objects around, then ComplexConstructor foo; // Boom! mirror may point to JUNK instead of the intended object (some dereference of mirror) // Here's another call that may block for GC, making mirror stale MutexLocker ml(some_lock); // And here's an initializer that can result in a stale oop // all in one step. oop o = call_that_can_throw_exception(TRAPS); The solution is to keep the oop declaration BELOW the ctor or function call that might cause a GC, do another resolve to reassign the oop, or consider use of a Handle instead of an oop so there is immunity from object motion. But note that the "QUICK" entries below do not have a handlemark and thus can only support use of handles passed in. */ static void trace_class_resolution_impl(Klass* to_class, TRAPS) { ResourceMark rm; int line_number = -1; const char * source_file = NULL; const char * trace = "explicit"; InstanceKlass* caller = NULL; JavaThread* jthread = JavaThread::current(); if (jthread->has_last_Java_frame()) { vframeStream vfst(jthread); // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); Method* last_caller = NULL; while (!vfst.at_end()) { Method* m = vfst.method(); if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { break; } last_caller = m; vfst.next(); } // if this is called from Class.forName0 and that is called from Class.forName, // then print the caller of Class.forName. If this is Class.loadClass, then print // that caller, otherwise keep quiet since this should be picked up elsewhere. bool found_it = false; if (!vfst.at_end() && vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && vfst.method()->name() == vmSymbols::forName0_name()) { vfst.next(); if (!vfst.at_end() && vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && vfst.method()->name() == vmSymbols::forName_name()) { vfst.next(); found_it = true; } } else if (last_caller != NULL && last_caller->method_holder()->name() == vmSymbols::java_lang_ClassLoader() && (last_caller->name() == vmSymbols::loadClassInternal_name() || last_caller->name() == vmSymbols::loadClass_name())) { found_it = true; } else if (!vfst.at_end()) { if (vfst.method()->is_native()) { // JNI call found_it = true; } } if (found_it && !vfst.at_end()) { // found the caller caller = vfst.method()->method_holder(); line_number = vfst.method()->line_number_from_bci(vfst.bci()); if (line_number == -1) { // show method name if it's a native method trace = vfst.method()->name_and_sig_as_C_string(); } Symbol* s = caller->source_file_name(); if (s != NULL) { source_file = s->as_C_string(); } } } if (caller != NULL) { if (to_class != caller) { const char * from = caller->external_name(); const char * to = to_class->external_name(); // print in a single call to reduce interleaving between threads if (source_file != NULL) { log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); } else { log_debug(class, resolve)("%s %s (%s)", from, to, trace); } } } } void trace_class_resolution(Klass* to_class) { EXCEPTION_MARK; trace_class_resolution_impl(to_class, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; } } // Wrapper to trace JVM functions #ifdef ASSERT Histogram* JVMHistogram; volatile jint JVMHistogram_lock = 0; class JVMHistogramElement : public HistogramElement { public: JVMHistogramElement(const char* name); }; JVMHistogramElement::JVMHistogramElement(const char* elementName) { _name = elementName; uintx count = 0; while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { count +=1; if ( (WarnOnStalledSpinLock > 0) && (count % WarnOnStalledSpinLock == 0)) { warning("JVMHistogram_lock seems to be stalled"); } } } if(JVMHistogram == NULL) JVMHistogram = new Histogram("JVM Call Counts",100); JVMHistogram->add_element(this); Atomic::dec(&JVMHistogram_lock); } #define JVMCountWrapper(arg) \ static JVMHistogramElement* e = new JVMHistogramElement(arg); \ if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! #define JVMWrapper(arg) JVMCountWrapper(arg); #else #define JVMWrapper(arg) #endif // Interface version ///////////////////////////////////////////////////////////////////// JVM_LEAF(jint, JVM_GetInterfaceVersion()) return JVM_INTERFACE_VERSION; JVM_END // java.lang.System ////////////////////////////////////////////////////////////////////// JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) JVMWrapper("JVM_CurrentTimeMillis"); return os::javaTimeMillis(); JVM_END JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) JVMWrapper("JVM_NanoTime"); return os::javaTimeNanos(); JVM_END // The function below is actually exposed by jdk.internal.misc.VM and not // java.lang.System, but we choose to keep it here so that it stays next // to JVM_CurrentTimeMillis and JVM_NanoTime const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) JVMWrapper("JVM_GetNanoTimeAdjustment"); jlong seconds; jlong nanos; os::javaTimeSystemUTC(seconds, nanos); // We're going to verify that the result can fit in a long. // For that we need the difference in seconds between 'seconds' // and 'offset_secs' to be such that: // |seconds - offset_secs| < (2^63/10^9) // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) // which makes |seconds - offset_secs| < 2^33 // and we will prefer +/- 2^32 as the maximum acceptable diff // as 2^32 has a more natural feel than 2^33... // // So if |seconds - offset_secs| >= 2^32 - we return a special // sentinel value (-1) which the caller should take as an // exception value indicating that the offset given to us is // too far from range of the current time - leading to too big // a nano adjustment. The caller is expected to recover by // computing a more accurate offset and calling this method // again. (For the record 2^32 secs is ~136 years, so that // should rarely happen) // jlong diff = seconds - offset_secs; if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { return -1; // sentinel value: the offset is too far off the target } // return the adjustment. If you compute a time by adding // this number of nanoseconds along with the number of seconds // in the offset you should get the current UTC time. return (diff * (jlong)1000000000) + nanos; JVM_END JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, jobject dst, jint dst_pos, jint length)) JVMWrapper("JVM_ArrayCopy"); // Check if we have null pointers if (src == NULL || dst == NULL) { THROW(vmSymbols::java_lang_NullPointerException()); } arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); assert(s->is_oop(), "JVM_ArrayCopy: src not an oop"); assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop"); // Do copy s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); JVM_END static void set_property(Handle props, const char* key, const char* value, TRAPS) { JavaValue r(T_OBJECT); // public synchronized Object put(Object key, Object value); HandleMark hm(THREAD); Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); JavaCalls::call_virtual(&r, props, KlassHandle(THREAD, SystemDictionary::Properties_klass()), vmSymbols::put_name(), vmSymbols::object_object_object_signature(), key_str, value_str, THREAD); } #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) JVMWrapper("JVM_InitProperties"); ResourceMark rm; Handle props(THREAD, JNIHandles::resolve_non_null(properties)); // System property list includes both user set via -D option and // jvm system specific properties. for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { PUTPROP(props, p->key(), p->value()); } // Convert the -XX:MaxDirectMemorySize= command line flag // to the sun.nio.MaxDirectMemorySize property. // Do this after setting user properties to prevent people // from setting the value with a -D option, as requested. { if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); } else { char as_chars[256]; jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); } } // JVM monitoring and management support // Add the sun.management.compiler property for the compiler's name { #undef CSIZE #if defined(_LP64) || defined(_WIN64) #define CSIZE "64-Bit " #else #define CSIZE #endif // 64bit #ifdef TIERED const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; #else #if defined(COMPILER1) const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; #elif defined(COMPILER2) const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; #elif INCLUDE_JVMCI #error "INCLUDE_JVMCI should imply TIERED" #else const char* compiler_name = ""; #endif // compilers #endif // TIERED if (*compiler_name != '\0' && (Arguments::mode() != Arguments::_int)) { PUTPROP(props, "sun.management.compiler", compiler_name); } } return properties; JVM_END /* * Return the temporary directory that the VM uses for the attach * and perf data files. * * It is important that this directory is well-known and the * same for all VM instances. It cannot be affected by configuration * variables such as java.io.tmpdir. */ JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) JVMWrapper("JVM_GetTemporaryDirectory"); HandleMark hm(THREAD); const char* temp_dir = os::get_temp_directory(); Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); return (jstring) JNIHandles::make_local(env, h()); JVM_END // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// extern volatile jint vm_created; JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) before_exit(thread); vm_exit(code); JVM_END JVM_ENTRY_NO_ENV(void, JVM_GC(void)) JVMWrapper("JVM_GC"); if (!DisableExplicitGC) { Universe::heap()->collect(GCCause::_java_lang_system_gc); } JVM_END JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) JVMWrapper("JVM_MaxObjectInspectionAge"); return Universe::heap()->millis_since_last_gc(); JVM_END static inline jlong convert_size_t_to_jlong(size_t val) { // In the 64-bit vm, a size_t can overflow a jlong (which is signed). NOT_LP64 (return (jlong)val;) LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) } JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) JVMWrapper("JVM_TotalMemory"); size_t n = Universe::heap()->capacity(); return convert_size_t_to_jlong(n); JVM_END JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) JVMWrapper("JVM_FreeMemory"); CollectedHeap* ch = Universe::heap(); size_t n; { MutexLocker x(Heap_lock); n = ch->capacity() - ch->used(); } return convert_size_t_to_jlong(n); JVM_END JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) JVMWrapper("JVM_MaxMemory"); size_t n = Universe::heap()->max_capacity(); return convert_size_t_to_jlong(n); JVM_END JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) JVMWrapper("JVM_ActiveProcessorCount"); return os::active_processor_count(); JVM_END // java.lang.Throwable ////////////////////////////////////////////////////// JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) JVMWrapper("JVM_FillInStackTrace"); Handle exception(thread, JNIHandles::resolve_non_null(receiver)); java_lang_Throwable::fill_in_stack_trace(exception); JVM_END // java.lang.StackTraceElement ////////////////////////////////////////////// JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) JVMWrapper("JVM_InitStackTraceElementArray"); Handle exception(THREAD, JNIHandles::resolve(throwable)); objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); objArrayHandle stack_trace(THREAD, st); // Fill in the allocated stack trace java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); JVM_END JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) JVMWrapper("JVM_InitStackTraceElement"); Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); JVM_END // java.lang.StackWalker ////////////////////////////////////////////////////// JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jint skip_frames, jint frame_count, jint start_index, jobjectArray frames)) JVMWrapper("JVM_CallStackWalk"); JavaThread* jt = (JavaThread*) THREAD; if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); } Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); // frames array is a Class[] array when only getting caller reference, // and a StackFrameInfo[] array (or derivative) otherwise. It should never // be null. objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); objArrayHandle frames_array_h(THREAD, fa); int limit = start_index + frame_count; if (frames_array_h->length() < limit) { THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); } Handle result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, start_index, frames_array_h, CHECK_NULL); return JNIHandles::make_local(env, result()); JVM_END JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, jint frame_count, jint start_index, jobjectArray frames)) JVMWrapper("JVM_MoreStackWalk"); JavaThread* jt = (JavaThread*) THREAD; // frames array is a Class[] array when only getting caller reference, // and a StackFrameInfo[] array (or derivative) otherwise. It should never // be null. objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); objArrayHandle frames_array_h(THREAD, fa); int limit = start_index+frame_count; if (frames_array_h->length() < limit) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); } Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, start_index, frames_array_h, THREAD); JVM_END // java.lang.Object /////////////////////////////////////////////// JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) JVMWrapper("JVM_IHashCode"); // as implemented in the classic virtual machine; return 0 if object is NULL return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; JVM_END JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) JVMWrapper("JVM_MonitorWait"); Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); JavaThreadInObjectWaitState jtiows(thread, ms != 0); if (JvmtiExport::should_post_monitor_wait()) { JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); // The current thread already owns the monitor and it has not yet // been added to the wait queue so the current thread cannot be // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT // event handler cannot accidentally consume an unpark() meant for // the ParkEvent associated with this ObjectMonitor. } ObjectSynchronizer::wait(obj, ms, CHECK); JVM_END JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) JVMWrapper("JVM_MonitorNotify"); Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); ObjectSynchronizer::notify(obj, CHECK); JVM_END JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) JVMWrapper("JVM_MonitorNotifyAll"); Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); ObjectSynchronizer::notifyall(obj, CHECK); JVM_END JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) JVMWrapper("JVM_Clone"); Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); const KlassHandle klass (THREAD, obj->klass()); JvmtiVMObjectAllocEventCollector oam; #ifdef ASSERT // Just checking that the cloneable flag is set correct if (obj->is_array()) { guarantee(klass->is_cloneable(), "all arrays are cloneable"); } else { guarantee(obj->is_instance(), "should be instanceOop"); bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); } #endif // Check if class of obj supports the Cloneable interface. // All arrays are considered to be cloneable (See JLS 20.1.5) if (!klass->is_cloneable()) { ResourceMark rm(THREAD); THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); } // Make shallow object copy const int size = obj->size(); oop new_obj_oop = NULL; if (obj->is_array()) { const int length = ((arrayOop)obj())->length(); new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); } else { new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); } // 4839641 (4840070): We must do an oop-atomic copy, because if another thread // is modifying a reference field in the clonee, a non-oop-atomic copy might // be suspended in the middle of copying the pointer and end up with parts // of two different pointers in the field. Subsequent dereferences will crash. // 4846409: an oop-copy of objects with long or double fields or arrays of same // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead // of oops. We know objects are aligned on a minimum of an jlong boundary. // The same is true of StubRoutines::object_copy and the various oop_copy // variants, and of the code generated by the inline_native_clone intrinsic. assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop, (size_t)align_object_size(size) / HeapWordsPerLong); // Clear the header new_obj_oop->init_mark(); // Store check (mark entire object and let gc sort it out) BarrierSet* bs = Universe::heap()->barrier_set(); assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); Handle new_obj(THREAD, new_obj_oop); // Special handling for MemberNames. Since they contain Method* metadata, they // must be registered so that RedefineClasses can fix metadata contained in them. if (java_lang_invoke_MemberName::is_instance(new_obj()) && java_lang_invoke_MemberName::is_method(new_obj())) { Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj()); // MemberName may be unresolved, so doesn't need registration until resolved. if (method != NULL) { methodHandle m(THREAD, method); // This can safepoint and redefine method, so need both new_obj and method // in a handle, for two different reasons. new_obj can move, method can be // deleted if nothing is using it on the stack. m->method_holder()->add_member_name(new_obj()); } } // Caution: this involves a java upcall, so the clone should be // "gc-robust" by this stage. if (klass->has_finalizer()) { assert(obj->is_instance(), "should be instanceOop"); new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); new_obj = Handle(THREAD, new_obj_oop); } return JNIHandles::make_local(env, new_obj()); JVM_END // java.io.File /////////////////////////////////////////////////////////////// JVM_LEAF(char*, JVM_NativePath(char* path)) JVMWrapper("JVM_NativePath"); return os::native_path(path); JVM_END // Misc. class handling /////////////////////////////////////////////////////////// JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) JVMWrapper("JVM_GetCallerClass"); // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or // sun.reflect.Reflection.getCallerClass with a depth parameter is provided // temporarily for existing code to use until a replacement API is defined. if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { Klass* k = thread->security_get_caller_class(depth); return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); } // Getting the class of the caller frame. // // The call stack at this point looks something like this: // // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] // [1] [ @CallerSensitive API.method ] // [.] [ (skipped intermediate frames) ] // [n] [ caller ] vframeStream vfst(thread); // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { Method* m = vfst.method(); assert(m != NULL, "sanity"); switch (n) { case 0: // This must only be called from Reflection.getCallerClass if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); } // fall-through case 1: // Frame 0 and 1 must be caller sensitive. if (!m->caller_sensitive()) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); } break; default: if (!m->is_ignored_by_security_stack_walk()) { // We have reached the desired frame; return the holder class. return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); } break; } } return NULL; JVM_END JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) JVMWrapper("JVM_FindPrimitiveClass"); oop mirror = NULL; BasicType t = name2type(utf); if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { mirror = Universe::java_mirror(t); } if (mirror == NULL) { THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); } else { return (jclass) JNIHandles::make_local(env, mirror); } JVM_END // Returns a class loaded by the bootstrap class loader; or null // if not found. ClassNotFoundException is not thrown. // FindClassFromBootLoader is exported to the launcher for windows. JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, const char* name)) JVMWrapper("JVM_FindClassFromBootLoader"); // Java libraries should ensure that name is never null... if (name == NULL || (int)strlen(name) > Symbol::max_length()) { // It's impossible to create this class; the name cannot fit // into the constant pool. return NULL; } TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); if (k == NULL) { return NULL; } if (log_is_enabled(Debug, class, resolve)) { trace_class_resolution(k); } return (jclass) JNIHandles::make_local(env, k->java_mirror()); JVM_END // Find a class with this name in this loader, using the caller's protection domain. JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, jboolean init, jobject loader, jclass caller)) JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); // Java libraries should ensure that name is never null... if (name == NULL || (int)strlen(name) > Symbol::max_length()) { // It's impossible to create this class; the name cannot fit // into the constant pool. THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); } TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); oop loader_oop = JNIHandles::resolve(loader); oop from_class = JNIHandles::resolve(caller); oop protection_domain = NULL; // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get // NPE. Put it in another way, the bootstrap class loader has all permission and // thus no checkPackageAccess equivalence in the VM class loader. // The caller is also passed as NULL by the java code if there is no security // manager to avoid the performance cost of getting the calling class. if (from_class != NULL && loader_oop != NULL) { protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); } Handle h_loader(THREAD, loader_oop); Handle h_prot(THREAD, protection_domain); jclass result = find_class_from_class_loader(env, h_name, init, h_loader, h_prot, false, THREAD); if (log_is_enabled(Debug, class, resolve) && result != NULL) { trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); } return result; JVM_END JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, jboolean init, jclass from)) JVMWrapper("JVM_FindClassFromClass"); if (name == NULL || (int)strlen(name) > Symbol::max_length()) { // It's impossible to create this class; the name cannot fit // into the constant pool. THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); } TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); oop from_class_oop = JNIHandles::resolve(from); Klass* from_class = (from_class_oop == NULL) ? (Klass*)NULL : java_lang_Class::as_Klass(from_class_oop); oop class_loader = NULL; oop protection_domain = NULL; if (from_class != NULL) { class_loader = from_class->class_loader(); protection_domain = from_class->protection_domain(); } Handle h_loader(THREAD, class_loader); Handle h_prot (THREAD, protection_domain); jclass result = find_class_from_class_loader(env, h_name, init, h_loader, h_prot, true, thread); if (log_is_enabled(Debug, class, resolve) && result != NULL) { // this function is generally only used for class loading during verification. ResourceMark rm; oop from_mirror = JNIHandles::resolve_non_null(from); Klass* from_class = java_lang_Class::as_Klass(from_mirror); const char * from_name = from_class->external_name(); oop mirror = JNIHandles::resolve_non_null(result); Klass* to_class = java_lang_Class::as_Klass(mirror); const char * to = to_class->external_name(); log_debug(class, resolve)("%s %s (verification)", from_name, to); } return result; JVM_END static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { if (loader.is_null()) { return; } // check whether the current caller thread holds the lock or not. // If not, increment the corresponding counter if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != ObjectSynchronizer::owner_self) { counter->inc(); } } // common code for JVM_DefineClass() and JVM_DefineClassWithSource() static jclass jvm_define_class_common(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source, TRAPS) { if (source == NULL) source = "__JVM_DefineClass__"; assert(THREAD->is_Java_thread(), "must be a JavaThread"); JavaThread* jt = (JavaThread*) THREAD; PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), ClassLoader::perf_define_appclass_selftime(), ClassLoader::perf_define_appclasses(), jt->get_thread_stat()->perf_recursion_counts_addr(), jt->get_thread_stat()->perf_timers_addr(), PerfClassTraceTime::DEFINE_CLASS); if (UsePerfData) { ClassLoader::perf_app_classfile_bytes_read()->inc(len); } // Since exceptions can be thrown, class initialization can take place // if name is NULL no check for class name in .class stream has to be made. TempNewSymbol class_name = NULL; if (name != NULL) { const int str_len = (int)strlen(name); if (str_len > Symbol::max_length()) { // It's impossible to create this class; the name cannot fit // into the constant pool. THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); } class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); } ResourceMark rm(THREAD); ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); Handle class_loader (THREAD, JNIHandles::resolve(loader)); if (UsePerfData) { is_lock_held_by_thread(class_loader, ClassLoader::sync_JVMDefineClassLockFreeCounter(), THREAD); } Handle protection_domain (THREAD, JNIHandles::resolve(pd)); Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader, protection_domain, &st, CHECK_NULL); if (log_is_enabled(Debug, class, resolve) && k != NULL) { trace_class_resolution(k); } return (jclass) JNIHandles::make_local(env, k->java_mirror()); } JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) JVMWrapper("JVM_DefineClass"); return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); JVM_END JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) JVMWrapper("JVM_DefineClassWithSource"); return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); JVM_END JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) JVMWrapper("JVM_FindLoadedClass"); ResourceMark rm(THREAD); Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); const char* str = java_lang_String::as_utf8_string(string()); // Sanity check, don't expect null if (str == NULL) return NULL; const int str_len = (int)strlen(str); if (str_len > Symbol::max_length()) { // It's impossible to create this class; the name cannot fit // into the constant pool. return NULL; } TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); // Security Note: // The Java level wrapper will perform the necessary security check allowing // us to pass the NULL as the initiating class loader. Handle h_loader(THREAD, JNIHandles::resolve(loader)); if (UsePerfData) { is_lock_held_by_thread(h_loader, ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), THREAD); } Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, h_loader, Handle(), CHECK_NULL); #if INCLUDE_CDS if (k == NULL) { // If the class is not already loaded, try to see if it's in the shared // archive for the current classloader (h_loader). instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class( klass_name, h_loader, CHECK_NULL); k = ik(); } #endif return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); JVM_END // Module support ////////////////////////////////////////////////////////////////////////////// JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, jstring location, const char* const* packages, jsize num_packages)) JVMWrapper("JVM_DefineModule"); Modules::define_module(module, version, location, packages, num_packages, CHECK); JVM_END JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) JVMWrapper("JVM_SetBootLoaderUnnamedModule"); Modules::set_bootloader_unnamed_module(module, CHECK); JVM_END JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) JVMWrapper("JVM_AddModuleExports"); Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); JVM_END JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); JVM_END JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) JVMWrapper("JVM_AddModuleExportsToAll"); Modules::add_module_exports(from_module, package, NULL, CHECK); JVM_END JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) JVMWrapper("JVM_AddReadsModule"); Modules::add_reads_module(from_module, source_module, CHECK); JVM_END JVM_ENTRY (void, JVM_AddModulePackage(JNIEnv *env, jobject module, const char* package)) JVMWrapper("JVM_AddModulePackage"); Modules::add_module_package(module, package, CHECK); JVM_END // Reflection support ////////////////////////////////////////////////////////////////////////////// JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) assert (cls != NULL, "illegal class"); JVMWrapper("JVM_GetClassName"); JvmtiVMObjectAllocEventCollector oam; ResourceMark rm(THREAD); const char* name; if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); } else { // Consider caching interned string in Klass Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); assert(k->is_klass(), "just checking"); name = k->external_name(); } oop result = StringTable::intern((char*) name, CHECK_NULL); return (jstring) JNIHandles::make_local(env, result); JVM_END JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) JVMWrapper("JVM_GetClassInterfaces"); JvmtiVMObjectAllocEventCollector oam; oop mirror = JNIHandles::resolve_non_null(cls); // Special handling for primitive objects if (java_lang_Class::is_primitive(mirror)) { // Primitive objects does not have any interfaces objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); return (jobjectArray) JNIHandles::make_local(env, r); } KlassHandle klass(thread, java_lang_Class::as_Klass(mirror)); // Figure size of result array int size; if (klass->is_instance_klass()) { size = InstanceKlass::cast(klass())->local_interfaces()->length(); } else { assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); size = 2; } // Allocate result array objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); objArrayHandle result (THREAD, r); // Fill in result if (klass->is_instance_klass()) { // Regular instance klass, fill in all local interfaces for (int index = 0; index < size; index++) { Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index); result->obj_at_put(index, k->java_mirror()); } } else { // All arrays implement java.lang.Cloneable and java.io.Serializable result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); } return (jobjectArray) JNIHandles::make_local(env, result()); JVM_END JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) JVMWrapper("JVM_IsInterface"); oop mirror = JNIHandles::resolve_non_null(cls); if (java_lang_Class::is_primitive(mirror)) { return JNI_FALSE; } Klass* k = java_lang_Class::as_Klass(mirror); jboolean result = k->is_interface(); assert(!result || k->is_instance_klass(), "all interfaces are instance types"); // The compiler intrinsic for isInterface tests the // Klass::_access_flags bits in the same way. return result; JVM_END JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) JVMWrapper("JVM_GetClassSigners"); JvmtiVMObjectAllocEventCollector oam; if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { // There are no signers for primitive types return NULL; } objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); // If there are no signers set in the class, or if the class // is an array, return NULL. if (signers == NULL) return NULL; // copy of the signers array Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); for (int index = 0; index < signers->length(); index++) { signers_copy->obj_at_put(index, signers->obj_at(index)); } // return the copy return (jobjectArray) JNIHandles::make_local(env, signers_copy); JVM_END JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) JVMWrapper("JVM_SetClassSigners"); if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { // This call is ignored for primitive types and arrays. // Signers are only set once, ClassLoader.java, and thus shouldn't // be called with an array. Only the bootstrap loader creates arrays. Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); if (k->is_instance_klass()) { java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); } } JVM_END JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) JVMWrapper("JVM_GetProtectionDomain"); if (JNIHandles::resolve(cls) == NULL) { THROW_(vmSymbols::java_lang_NullPointerException(), NULL); } if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { // Primitive types does not have a protection domain. return NULL; } oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); return (jobject) JNIHandles::make_local(env, pd); JVM_END static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) { // If there is a security manager and protection domain, check the access // in the protection domain, otherwise it is authorized. if (java_lang_System::has_security_manager()) { // For bootstrapping, if pd implies method isn't in the JDK, allow // this context to revert to older behavior. // In this case the isAuthorized field in AccessControlContext is also not // present. if (Universe::protection_domain_implies_method() == NULL) { return true; } // Whitelist certain access control contexts if (java_security_AccessControlContext::is_authorized(context)) { return true; } oop prot = klass->protection_domain(); if (prot != NULL) { // Call pd.implies(new SecurityPermission("createAccessControlContext")) // in the new wrapper. methodHandle m(THREAD, Universe::protection_domain_implies_method()); Handle h_prot(THREAD, prot); JavaValue result(T_BOOLEAN); JavaCallArguments args(h_prot); JavaCalls::call(&result, m, &args, CHECK_false); return (result.get_jboolean() != 0); } } return true; } // Create an AccessControlContext with a protection domain with null codesource // and null permissions - which gives no permissions. oop create_dummy_access_control_context(TRAPS) { InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); // Call constructor ProtectionDomain(null, null); JavaValue result(T_VOID); JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass), vmSymbols::object_initializer_name(), vmSymbols::codesource_permissioncollection_signature(), Handle(), Handle(), CHECK_NULL); // new ProtectionDomain[] {pd}; objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); context->obj_at_put(0, obj()); // new AccessControlContext(new ProtectionDomain[] {pd}) objArrayHandle h_context(THREAD, context); oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); return acc; } JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) JVMWrapper("JVM_DoPrivileged"); if (action == NULL) { THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); } // Compute the frame initiating the do privileged operation and setup the privileged stack vframeStream vfst(thread); vfst.security_get_caller_frame(1); if (vfst.at_end()) { THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); } Method* method = vfst.method(); instanceKlassHandle klass (THREAD, method->method_holder()); // Check that action object understands "Object run()" Handle h_context; if (context != NULL) { h_context = Handle(THREAD, JNIHandles::resolve(context)); bool authorized = is_authorized(h_context, klass, CHECK_NULL); if (!authorized) { // Create an unprivileged access control object and call it's run function // instead. oop noprivs = create_dummy_access_control_context(CHECK_NULL); h_context = Handle(THREAD, noprivs); } } // Check that action object understands "Object run()" Handle object (THREAD, JNIHandles::resolve(action)); // get run() method Method* m_oop = object->klass()->uncached_lookup_method( vmSymbols::run_method_name(), vmSymbols::void_object_signature(), Klass::find_overpass); methodHandle m (THREAD, m_oop); if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); } // Stack allocated list of privileged stack elements PrivilegedElement pi; if (!vfst.at_end()) { pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); thread->set_privileged_stack_top(&pi); } // invoke the Object run() in the action object. We cannot use call_interface here, since the static type // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction Handle pending_exception; JavaValue result(T_OBJECT); JavaCallArguments args(object); JavaCalls::call(&result, m, &args, THREAD); // done with action, remove ourselves from the list if (!vfst.at_end()) { assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); } if (HAS_PENDING_EXCEPTION) { pending_exception = Handle(THREAD, PENDING_EXCEPTION); CLEAR_PENDING_EXCEPTION; // JVMTI has already reported the pending exception // JVMTI internal flag reset is needed in order to report PrivilegedActionException if (THREAD->is_Java_thread()) { JvmtiExport::clear_detected_exception((JavaThread*) THREAD); } if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { // Throw a java.security.PrivilegedActionException(Exception e) exception JavaCallArguments args(pending_exception); THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), vmSymbols::exception_void_signature(), &args); } } if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); return JNIHandles::make_local(env, (oop) result.get_jobject()); JVM_END // Returns the inherited_access_control_context field of the running thread. JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) JVMWrapper("JVM_GetInheritedAccessControlContext"); oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); return JNIHandles::make_local(env, result); JVM_END class RegisterArrayForGC { private: JavaThread *_thread; public: RegisterArrayForGC(JavaThread *thread, GrowableArray* array) { _thread = thread; _thread->register_array_for_gc(array); } ~RegisterArrayForGC() { _thread->register_array_for_gc(NULL); } }; JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) JVMWrapper("JVM_GetStackAccessControlContext"); if (!UsePrivilegedStack) return NULL; ResourceMark rm(THREAD); GrowableArray* local_array = new GrowableArray(12); JvmtiVMObjectAllocEventCollector oam; // count the protection domains on the execution stack. We collapse // duplicate consecutive protection domains into a single one, as // well as stopping when we hit a privileged frame. // Use vframeStream to iterate through Java frames vframeStream vfst(thread); oop previous_protection_domain = NULL; Handle privileged_context(thread, NULL); bool is_privileged = false; oop protection_domain = NULL; for(; !vfst.at_end(); vfst.next()) { // get method of frame Method* method = vfst.method(); intptr_t* frame_id = vfst.frame_id(); // check the privileged frames to see if we have a match if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { // this frame is privileged is_privileged = true; privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); protection_domain = thread->privileged_stack_top()->protection_domain(); } else { protection_domain = method->method_holder()->protection_domain(); } if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { local_array->push(protection_domain); previous_protection_domain = protection_domain; } if (is_privileged) break; } // either all the domains on the stack were system domains, or // we had a privileged system domain if (local_array->is_empty()) { if (is_privileged && privileged_context.is_null()) return NULL; oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); return JNIHandles::make_local(env, result); } // the resource area must be registered in case of a gc RegisterArrayForGC ragc(thread, local_array); objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), local_array->length(), CHECK_NULL); objArrayHandle h_context(thread, context); for (int index = 0; index < local_array->length(); index++) { h_context->obj_at_put(index, local_array->at(index)); } oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); return JNIHandles::make_local(env, result); JVM_END JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) JVMWrapper("JVM_IsArrayClass"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); return (k != NULL) && k->is_array_klass() ? true : false; JVM_END JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) JVMWrapper("JVM_IsPrimitiveClass"); oop mirror = JNIHandles::resolve_non_null(cls); return (jboolean) java_lang_Class::is_primitive(mirror); JVM_END JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) JVMWrapper("JVM_GetClassModifiers"); if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { // Primitive type return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; } Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); return k->modifier_flags(); JVM_END // Inner class reflection /////////////////////////////////////////////////////////////////////////////// JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) JvmtiVMObjectAllocEventCollector oam; // ofClass is a reference to a java_lang_Class object. The mirror object // of an InstanceKlass if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); return (jobjectArray)JNIHandles::make_local(env, result); } instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); InnerClassesIterator iter(k); if (iter.length() == 0) { // Neither an inner nor outer class oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); return (jobjectArray)JNIHandles::make_local(env, result); } // find inner class info constantPoolHandle cp(thread, k->constants()); int length = iter.length(); // Allocate temp. result array objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); objArrayHandle result (THREAD, r); int members = 0; for (; !iter.done(); iter.next()) { int ioff = iter.inner_class_info_index(); int ooff = iter.outer_class_info_index(); if (ioff != 0 && ooff != 0) { // Check to see if the name matches the class we're looking for // before attempting to find the class. if (cp->klass_name_at_matches(k, ooff)) { Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); if (outer_klass == k()) { Klass* ik = cp->klass_at(ioff, CHECK_NULL); instanceKlassHandle inner_klass (THREAD, ik); // Throws an exception if outer klass has not declared k as // an inner klass Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); result->obj_at_put(members, inner_klass->java_mirror()); members++; } } } } if (members != length) { // Return array of right length objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); for(int i = 0; i < members; i++) { res->obj_at_put(i, result->obj_at(i)); } return (jobjectArray)JNIHandles::make_local(env, res); } return (jobjectArray)JNIHandles::make_local(env, result()); JVM_END JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) { // ofClass is a reference to a java_lang_Class object. if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { return NULL; } bool inner_is_member = false; Klass* outer_klass = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) )->compute_enclosing_class(&inner_is_member, CHECK_NULL); if (outer_klass == NULL) return NULL; // already a top-level class if (!inner_is_member) return NULL; // an anonymous class (inside a method) return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); } JVM_END JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) { oop mirror = JNIHandles::resolve_non_null(cls); if (java_lang_Class::is_primitive(mirror) || !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { return NULL; } instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror))); int ooff = 0, noff = 0; if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) { if (noff != 0) { constantPoolHandle i_cp(thread, k->constants()); Symbol* name = i_cp->symbol_at(noff); Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); return (jstring) JNIHandles::make_local(env, str()); } } return NULL; } JVM_END JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) assert (cls != NULL, "illegal class"); JVMWrapper("JVM_GetClassSignature"); JvmtiVMObjectAllocEventCollector oam; ResourceMark rm(THREAD); // Return null for arrays and primatives if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); if (k->is_instance_klass()) { Symbol* sym = InstanceKlass::cast(k)->generic_signature(); if (sym == NULL) return NULL; Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); return (jstring) JNIHandles::make_local(env, str()); } } return NULL; JVM_END JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) assert (cls != NULL, "illegal class"); JVMWrapper("JVM_GetClassAnnotations"); // Return null for arrays and primitives if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); if (k->is_instance_klass()) { typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); return (jbyteArray) JNIHandles::make_local(env, a); } } return NULL; JVM_END static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { // some of this code was adapted from from jni_FromReflectedField oop reflected = JNIHandles::resolve_non_null(field); oop mirror = java_lang_reflect_Field::clazz(reflected); Klass* k = java_lang_Class::as_Klass(mirror); int slot = java_lang_reflect_Field::slot(reflected); int modifiers = java_lang_reflect_Field::modifiers(reflected); KlassHandle kh(THREAD, k); intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot); if (modifiers & JVM_ACC_STATIC) { // for static fields we only look in the current class if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) { assert(false, "cannot find static field"); return false; } } else { // for instance fields we start with the current class and work // our way up through the superclass chain if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) { assert(false, "cannot find instance field"); return false; } } return true; } static Method* jvm_get_method_common(jobject method) { // some of this code was adapted from from jni_FromReflectedMethod oop reflected = JNIHandles::resolve_non_null(method); oop mirror = NULL; int slot = 0; if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { mirror = java_lang_reflect_Constructor::clazz(reflected); slot = java_lang_reflect_Constructor::slot(reflected); } else { assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), "wrong type"); mirror = java_lang_reflect_Method::clazz(reflected); slot = java_lang_reflect_Method::slot(reflected); } Klass* k = java_lang_Class::as_Klass(mirror); Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); assert(m != NULL, "cannot find method"); return m; // caller has to deal with NULL in product mode } /* Type use annotations support (JDK 1.8) */ JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) assert (cls != NULL, "illegal class"); JVMWrapper("JVM_GetClassTypeAnnotations"); ResourceMark rm(THREAD); // Return null for arrays and primitives if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); if (k->is_instance_klass()) { AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); if (type_annotations != NULL) { typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); return (jbyteArray) JNIHandles::make_local(env, a); } } } return NULL; JVM_END JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) assert (method != NULL, "illegal method"); JVMWrapper("JVM_GetMethodTypeAnnotations"); // method is a handle to a java.lang.reflect.Method object Method* m = jvm_get_method_common(method); if (m == NULL) { return NULL; } AnnotationArray* type_annotations = m->type_annotations(); if (type_annotations != NULL) { typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); return (jbyteArray) JNIHandles::make_local(env, a); } return NULL; JVM_END JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) assert (field != NULL, "illegal field"); JVMWrapper("JVM_GetFieldTypeAnnotations"); fieldDescriptor fd; bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); if (!gotFd) { return NULL; } return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); JVM_END static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { if (!cp->is_within_bounds(index)) { THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); } } JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) { JVMWrapper("JVM_GetMethodParameters"); // method is a handle to a java.lang.reflect.Method object Method* method_ptr = jvm_get_method_common(method); methodHandle mh (THREAD, method_ptr); Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); const int num_params = mh->method_parameters_length(); if (num_params < 0) { // A -1 return value from method_parameters_length means there is no // parameter data. Return null to indicate this to the reflection // API. assert(num_params == -1, "num_params should be -1 if it is less than zero"); return (jobjectArray)NULL; } else { // Otherwise, we return something up to reflection, even if it is // a zero-length array. Why? Because in some cases this can // trigger a MalformedParametersException. // make sure all the symbols are properly formatted for (int i = 0; i < num_params; i++) { MethodParametersElement* params = mh->method_parameters_start(); int index = params[i].name_cp_index; bounds_check(mh->constants(), index, CHECK_NULL); if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } } objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); objArrayHandle result (THREAD, result_oop); for (int i = 0; i < num_params; i++) { MethodParametersElement* params = mh->method_parameters_start(); // For a 0 index, give a NULL symbol Symbol* sym = 0 != params[i].name_cp_index ? mh->constants()->symbol_at(params[i].name_cp_index) : NULL; int flags = params[i].flags; oop param = Reflection::new_parameter(reflected_method, i, sym, flags, CHECK_NULL); result->obj_at_put(i, param); } return (jobjectArray)JNIHandles::make_local(env, result()); } } JVM_END // New (JDK 1.4) reflection implementation ///////////////////////////////////// JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) { JVMWrapper("JVM_GetClassDeclaredFields"); JvmtiVMObjectAllocEventCollector oam; // Exclude primitive types and array types if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { // Return empty array oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); return (jobjectArray) JNIHandles::make_local(env, res); } instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); constantPoolHandle cp(THREAD, k->constants()); // Ensure class is linked k->link_class(CHECK_NULL); // Allocate result int num_fields; if (publicOnly) { num_fields = 0; for (JavaFieldStream fs(k()); !fs.done(); fs.next()) { if (fs.access_flags().is_public()) ++num_fields; } } else { num_fields = k->java_fields_count(); } objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); objArrayHandle result (THREAD, r); int out_idx = 0; fieldDescriptor fd; for (JavaFieldStream fs(k); !fs.done(); fs.next()) { if (!publicOnly || fs.access_flags().is_public()) { fd.reinitialize(k(), fs.index()); oop field = Reflection::new_field(&fd, CHECK_NULL); result->obj_at_put(out_idx, field); ++out_idx; } } assert(out_idx == num_fields, "just checking"); return (jobjectArray) JNIHandles::make_local(env, result()); } JVM_END static bool select_method(methodHandle method, bool want_constructor) { if (want_constructor) { return (method->is_initializer() && !method->is_static()); } else { return (!method->is_initializer() && !method->is_overpass()); } } static jobjectArray get_class_declared_methods_helper( JNIEnv *env, jclass ofClass, jboolean publicOnly, bool want_constructor, Klass* klass, TRAPS) { JvmtiVMObjectAllocEventCollector oam; // Exclude primitive types and array types if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { // Return empty array oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); return (jobjectArray) JNIHandles::make_local(env, res); } instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); // Ensure class is linked k->link_class(CHECK_NULL); Array* methods = k->methods(); int methods_length = methods->length(); // Save original method_idnum in case of redefinition, which can change // the idnum of obsolete methods. The new method will have the same idnum // but if we refresh the methods array, the counts will be wrong. ResourceMark rm(THREAD); GrowableArray* idnums = new GrowableArray(methods_length); int num_methods = 0; for (int i = 0; i < methods_length; i++) { methodHandle method(THREAD, methods->at(i)); if (select_method(method, want_constructor)) { if (!publicOnly || method->is_public()) { idnums->push(method->method_idnum()); ++num_methods; } } } // Allocate result objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); objArrayHandle result (THREAD, r); // Now just put the methods that we selected above, but go by their idnum // in case of redefinition. The methods can be redefined at any safepoint, // so above when allocating the oop array and below when creating reflect // objects. for (int i = 0; i < num_methods; i++) { methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); if (method.is_null()) { // Method may have been deleted and seems this API can handle null // Otherwise should probably put a method that throws NSME result->obj_at_put(i, NULL); } else { oop m; if (want_constructor) { m = Reflection::new_constructor(method, CHECK_NULL); } else { m = Reflection::new_method(method, false, CHECK_NULL); } result->obj_at_put(i, m); } } return (jobjectArray) JNIHandles::make_local(env, result()); } JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) { JVMWrapper("JVM_GetClassDeclaredMethods"); return get_class_declared_methods_helper(env, ofClass, publicOnly, /*want_constructor*/ false, SystemDictionary::reflect_Method_klass(), THREAD); } JVM_END JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) { JVMWrapper("JVM_GetClassDeclaredConstructors"); return get_class_declared_methods_helper(env, ofClass, publicOnly, /*want_constructor*/ true, SystemDictionary::reflect_Constructor_klass(), THREAD); } JVM_END JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) { JVMWrapper("JVM_GetClassAccessFlags"); if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { // Primitive type return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; } Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; } JVM_END // Constant pool access ////////////////////////////////////////////////////////// JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) { JVMWrapper("JVM_GetClassConstantPool"); JvmtiVMObjectAllocEventCollector oam; // Return null for primitives and arrays if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); if (k->is_instance_klass()) { instanceKlassHandle k_h(THREAD, k); Handle jcp = reflect_ConstantPool::create(CHECK_NULL); reflect_ConstantPool::set_cp(jcp(), k_h->constants()); return JNIHandles::make_local(jcp()); } } return NULL; } JVM_END JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) { JVMWrapper("JVM_ConstantPoolGetSize"); constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); return cp->length(); } JVM_END JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetClassAt"); constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_NULL); constantTag tag = cp->tag_at(index); if (!tag.is_klass() && !tag.is_unresolved_klass()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } Klass* k = cp->klass_at(index, CHECK_NULL); return (jclass) JNIHandles::make_local(k->java_mirror()); } JVM_END JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_NULL); constantTag tag = cp->tag_at(index); if (!tag.is_klass() && !tag.is_unresolved_klass()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } Klass* k = ConstantPool::klass_at_if_loaded(cp, index); if (k == NULL) return NULL; return (jclass) JNIHandles::make_local(k->java_mirror()); } JVM_END static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { constantTag tag = cp->tag_at(index); if (!tag.is_method() && !tag.is_interface_method()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } int klass_ref = cp->uncached_klass_ref_index_at(index); Klass* k_o; if (force_resolution) { k_o = cp->klass_at(klass_ref, CHECK_NULL); } else { k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); if (k_o == NULL) return NULL; } instanceKlassHandle k(THREAD, k_o); Symbol* name = cp->uncached_name_ref_at(index); Symbol* sig = cp->uncached_signature_ref_at(index); methodHandle m (THREAD, k->find_method(name, sig)); if (m.is_null()) { THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); } oop method; if (!m->is_initializer() || m->is_static()) { method = Reflection::new_method(m, true, CHECK_NULL); } else { method = Reflection::new_constructor(m, CHECK_NULL); } return JNIHandles::make_local(method); } JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetMethodAt"); JvmtiVMObjectAllocEventCollector oam; constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_NULL); jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); return res; } JVM_END JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); JvmtiVMObjectAllocEventCollector oam; constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_NULL); jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); return res; } JVM_END static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { constantTag tag = cp->tag_at(index); if (!tag.is_field()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } int klass_ref = cp->uncached_klass_ref_index_at(index); Klass* k_o; if (force_resolution) { k_o = cp->klass_at(klass_ref, CHECK_NULL); } else { k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); if (k_o == NULL) return NULL; } instanceKlassHandle k(THREAD, k_o); Symbol* name = cp->uncached_name_ref_at(index); Symbol* sig = cp->uncached_signature_ref_at(index); fieldDescriptor fd; Klass* target_klass = k->find_field(name, sig, &fd); if (target_klass == NULL) { THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); } oop field = Reflection::new_field(&fd, CHECK_NULL); return JNIHandles::make_local(field); } JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) { JVMWrapper("JVM_ConstantPoolGetFieldAt"); JvmtiVMObjectAllocEventCollector oam; constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_NULL); jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); return res; } JVM_END JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); JvmtiVMObjectAllocEventCollector oam; constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_NULL); jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); return res; } JVM_END JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); JvmtiVMObjectAllocEventCollector oam; constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_NULL); constantTag tag = cp->tag_at(index); if (!tag.is_field_or_method()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } int klass_ref = cp->uncached_klass_ref_index_at(index); Symbol* klass_name = cp->klass_name_at(klass_ref); Symbol* member_name = cp->uncached_name_ref_at(index); Symbol* member_sig = cp->uncached_signature_ref_at(index); objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); objArrayHandle dest(THREAD, dest_o); Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); dest->obj_at_put(0, str()); str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); dest->obj_at_put(1, str()); str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); dest->obj_at_put(2, str()); return (jobjectArray) JNIHandles::make_local(dest()); } JVM_END JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); JvmtiVMObjectAllocEventCollector oam; constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_0); constantTag tag = cp->tag_at(index); if (!tag.is_field_or_method()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } return (jint) cp->uncached_klass_ref_index_at(index); } JVM_END JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); JvmtiVMObjectAllocEventCollector oam; constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_0); constantTag tag = cp->tag_at(index); if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } return (jint) cp->uncached_name_and_type_ref_index_at(index); } JVM_END JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); JvmtiVMObjectAllocEventCollector oam; constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_NULL); constantTag tag = cp->tag_at(index); if (!tag.is_name_and_type()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); objArrayHandle dest(THREAD, dest_o); Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); dest->obj_at_put(0, str()); str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); dest->obj_at_put(1, str()); return (jobjectArray) JNIHandles::make_local(dest()); } JVM_END JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetIntAt"); constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_0); constantTag tag = cp->tag_at(index); if (!tag.is_int()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } return cp->int_at(index); } JVM_END JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetLongAt"); constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_(0L)); constantTag tag = cp->tag_at(index); if (!tag.is_long()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } return cp->long_at(index); } JVM_END JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetFloatAt"); constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_(0.0f)); constantTag tag = cp->tag_at(index); if (!tag.is_float()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } return cp->float_at(index); } JVM_END JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetDoubleAt"); constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_(0.0)); constantTag tag = cp->tag_at(index); if (!tag.is_double()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } return cp->double_at(index); } JVM_END JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetStringAt"); constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_NULL); constantTag tag = cp->tag_at(index); if (!tag.is_string()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } oop str = cp->string_at(index, CHECK_NULL); return (jstring) JNIHandles::make_local(str); } JVM_END JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetUTF8At"); JvmtiVMObjectAllocEventCollector oam; constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_NULL); constantTag tag = cp->tag_at(index); if (!tag.is_symbol()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); } Symbol* sym = cp->symbol_at(index); Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); return (jstring) JNIHandles::make_local(str()); } JVM_END JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) { JVMWrapper("JVM_ConstantPoolGetTagAt"); constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); bounds_check(cp, index, CHECK_0); constantTag tag = cp->tag_at(index); jbyte result = tag.value(); // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, // they are changed to the corresponding tags from the JVM spec, so that java code in // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. if (tag.is_klass_or_reference()) { result = JVM_CONSTANT_Class; } else if (tag.is_string_index()) { result = JVM_CONSTANT_String; } else if (tag.is_method_type_in_error()) { result = JVM_CONSTANT_MethodType; } else if (tag.is_method_handle_in_error()) { result = JVM_CONSTANT_MethodHandle; } return result; } JVM_END // Assertion support. ////////////////////////////////////////////////////////// JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) JVMWrapper("JVM_DesiredAssertionStatus"); assert(cls != NULL, "bad class"); oop r = JNIHandles::resolve(cls); assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); if (java_lang_Class::is_primitive(r)) return false; Klass* k = java_lang_Class::as_Klass(r); assert(k->is_instance_klass(), "must be an instance klass"); if (!k->is_instance_klass()) return false; ResourceMark rm(THREAD); const char* name = k->name()->as_C_string(); bool system_class = k->class_loader() == NULL; return JavaAssertions::enabled(name, system_class); JVM_END // Return a new AssertionStatusDirectives object with the fields filled in with // command-line assertion arguments (i.e., -ea, -da). JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) JVMWrapper("JVM_AssertionStatusDirectives"); JvmtiVMObjectAllocEventCollector oam; oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); return JNIHandles::make_local(env, asd); JVM_END // Verification //////////////////////////////////////////////////////////////////////////////// // Reflection for the verifier ///////////////////////////////////////////////////////////////// // RedefineClasses support: bug 6214132 caused verification to fail. // All functions from this section should call the jvmtiThreadSate function: // Klass* class_to_verify_considering_redefinition(Klass* klass). // The function returns a Klass* of the _scratch_class if the verifier // was invoked in the middle of the class redefinition. // Otherwise it returns its argument value which is the _the_class Klass*. // Please, refer to the description in the jvmtiThreadSate.hpp. JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) JVMWrapper("JVM_GetClassNameUTF"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); return k->name()->as_utf8(); JVM_END JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) JVMWrapper("JVM_GetClassCPTypes"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); // types will have length zero if this is not an InstanceKlass // (length is determined by call to JVM_GetClassCPEntriesCount) if (k->is_instance_klass()) { ConstantPool* cp = InstanceKlass::cast(k)->constants(); for (int index = cp->length() - 1; index >= 0; index--) { constantTag tag = cp->tag_at(index); types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); } } JVM_END JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) JVMWrapper("JVM_GetClassCPEntriesCount"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); JVM_END JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) JVMWrapper("JVM_GetClassFieldsCount"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); JVM_END JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) JVMWrapper("JVM_GetClassMethodsCount"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); JVM_END // The following methods, used for the verifier, are never called with // array klasses, so a direct cast to InstanceKlass is safe. // Typically, these methods are called in a loop with bounds determined // by the results of JVM_GetClass{Fields,Methods}Count, which return // zero for arrays. JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) JVMWrapper("JVM_GetMethodIxExceptionIndexes"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); Method* method = InstanceKlass::cast(k)->methods()->at(method_index); int length = method->checked_exceptions_length(); if (length > 0) { CheckedExceptionElement* table= method->checked_exceptions_start(); for (int i = 0; i < length; i++) { exceptions[i] = table[i].class_cp_index; } } JVM_END JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) JVMWrapper("JVM_GetMethodIxExceptionsCount"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); Method* method = InstanceKlass::cast(k)->methods()->at(method_index); return method->checked_exceptions_length(); JVM_END JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) JVMWrapper("JVM_GetMethodIxByteCode"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); Method* method = InstanceKlass::cast(k)->methods()->at(method_index); memcpy(code, method->code_base(), method->code_size()); JVM_END JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) JVMWrapper("JVM_GetMethodIxByteCodeLength"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); Method* method = InstanceKlass::cast(k)->methods()->at(method_index); return method->code_size(); JVM_END JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); Method* method = InstanceKlass::cast(k)->methods()->at(method_index); ExceptionTable extable(method); entry->start_pc = extable.start_pc(entry_index); entry->end_pc = extable.end_pc(entry_index); entry->handler_pc = extable.handler_pc(entry_index); entry->catchType = extable.catch_type_index(entry_index); JVM_END JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) JVMWrapper("JVM_GetMethodIxExceptionTableLength"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); Method* method = InstanceKlass::cast(k)->methods()->at(method_index); return method->exception_table_length(); JVM_END JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) JVMWrapper("JVM_GetMethodIxModifiers"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); Method* method = InstanceKlass::cast(k)->methods()->at(method_index); return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; JVM_END JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) JVMWrapper("JVM_GetFieldIxModifiers"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; JVM_END JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) JVMWrapper("JVM_GetMethodIxLocalsCount"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); Method* method = InstanceKlass::cast(k)->methods()->at(method_index); return method->max_locals(); JVM_END JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) JVMWrapper("JVM_GetMethodIxArgsSize"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); Method* method = InstanceKlass::cast(k)->methods()->at(method_index); return method->size_of_parameters(); JVM_END JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) JVMWrapper("JVM_GetMethodIxMaxStack"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); Method* method = InstanceKlass::cast(k)->methods()->at(method_index); return method->verifier_max_stack(); JVM_END JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) JVMWrapper("JVM_IsConstructorIx"); ResourceMark rm(THREAD); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); Method* method = InstanceKlass::cast(k)->methods()->at(method_index); return method->name() == vmSymbols::object_initializer_name(); JVM_END JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) JVMWrapper("JVM_IsVMGeneratedMethodIx"); ResourceMark rm(THREAD); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); Method* method = InstanceKlass::cast(k)->methods()->at(method_index); return method->is_overpass(); JVM_END JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) JVMWrapper("JVM_GetMethodIxIxUTF"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); Method* method = InstanceKlass::cast(k)->methods()->at(method_index); return method->name()->as_utf8(); JVM_END JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) JVMWrapper("JVM_GetMethodIxSignatureUTF"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); Method* method = InstanceKlass::cast(k)->methods()->at(method_index); return method->signature()->as_utf8(); JVM_END /** * All of these JVM_GetCP-xxx methods are used by the old verifier to * read entries in the constant pool. Since the old verifier always * works on a copy of the code, it will not see any rewriting that * may possibly occur in the middle of verification. So it is important * that nothing it calls tries to use the cpCache instead of the raw * constant pool, so we must use cp->uncached_x methods when appropriate. */ JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) JVMWrapper("JVM_GetCPFieldNameUTF"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); ConstantPool* cp = InstanceKlass::cast(k)->constants(); switch (cp->tag_at(cp_index).value()) { case JVM_CONSTANT_Fieldref: return cp->uncached_name_ref_at(cp_index)->as_utf8(); default: fatal("JVM_GetCPFieldNameUTF: illegal constant"); } ShouldNotReachHere(); return NULL; JVM_END JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) JVMWrapper("JVM_GetCPMethodNameUTF"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); ConstantPool* cp = InstanceKlass::cast(k)->constants(); switch (cp->tag_at(cp_index).value()) { case JVM_CONSTANT_InterfaceMethodref: case JVM_CONSTANT_Methodref: return cp->uncached_name_ref_at(cp_index)->as_utf8(); default: fatal("JVM_GetCPMethodNameUTF: illegal constant"); } ShouldNotReachHere(); return NULL; JVM_END JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) JVMWrapper("JVM_GetCPMethodSignatureUTF"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); ConstantPool* cp = InstanceKlass::cast(k)->constants(); switch (cp->tag_at(cp_index).value()) { case JVM_CONSTANT_InterfaceMethodref: case JVM_CONSTANT_Methodref: return cp->uncached_signature_ref_at(cp_index)->as_utf8(); default: fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); } ShouldNotReachHere(); return NULL; JVM_END JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) JVMWrapper("JVM_GetCPFieldSignatureUTF"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); ConstantPool* cp = InstanceKlass::cast(k)->constants(); switch (cp->tag_at(cp_index).value()) { case JVM_CONSTANT_Fieldref: return cp->uncached_signature_ref_at(cp_index)->as_utf8(); default: fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); } ShouldNotReachHere(); return NULL; JVM_END JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) JVMWrapper("JVM_GetCPClassNameUTF"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); ConstantPool* cp = InstanceKlass::cast(k)->constants(); Symbol* classname = cp->klass_name_at(cp_index); return classname->as_utf8(); JVM_END JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) JVMWrapper("JVM_GetCPFieldClassNameUTF"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); ConstantPool* cp = InstanceKlass::cast(k)->constants(); switch (cp->tag_at(cp_index).value()) { case JVM_CONSTANT_Fieldref: { int class_index = cp->uncached_klass_ref_index_at(cp_index); Symbol* classname = cp->klass_name_at(class_index); return classname->as_utf8(); } default: fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); } ShouldNotReachHere(); return NULL; JVM_END JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) JVMWrapper("JVM_GetCPMethodClassNameUTF"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); ConstantPool* cp = InstanceKlass::cast(k)->constants(); switch (cp->tag_at(cp_index).value()) { case JVM_CONSTANT_Methodref: case JVM_CONSTANT_InterfaceMethodref: { int class_index = cp->uncached_klass_ref_index_at(cp_index); Symbol* classname = cp->klass_name_at(class_index); return classname->as_utf8(); } default: fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); } ShouldNotReachHere(); return NULL; JVM_END JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) JVMWrapper("JVM_GetCPFieldModifiers"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); ConstantPool* cp = InstanceKlass::cast(k)->constants(); ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); switch (cp->tag_at(cp_index).value()) { case JVM_CONSTANT_Fieldref: { Symbol* name = cp->uncached_name_ref_at(cp_index); Symbol* signature = cp->uncached_signature_ref_at(cp_index); for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) { if (fs.name() == name && fs.signature() == signature) { return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; } } return -1; } default: fatal("JVM_GetCPFieldModifiers: illegal constant"); } ShouldNotReachHere(); return 0; JVM_END JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) JVMWrapper("JVM_GetCPMethodModifiers"); Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); ConstantPool* cp = InstanceKlass::cast(k)->constants(); switch (cp->tag_at(cp_index).value()) { case JVM_CONSTANT_Methodref: case JVM_CONSTANT_InterfaceMethodref: { Symbol* name = cp->uncached_name_ref_at(cp_index); Symbol* signature = cp->uncached_signature_ref_at(cp_index); Array* methods = InstanceKlass::cast(k_called)->methods(); int methods_count = methods->length(); for (int i = 0; i < methods_count; i++) { Method* method = methods->at(i); if (method->name() == name && method->signature() == signature) { return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; } } return -1; } default: fatal("JVM_GetCPMethodModifiers: illegal constant"); } ShouldNotReachHere(); return 0; JVM_END // Misc ////////////////////////////////////////////////////////////////////////////////////////////// JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything JVM_END JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) JVMWrapper("JVM_IsSameClassPackage"); oop class1_mirror = JNIHandles::resolve_non_null(class1); oop class2_mirror = JNIHandles::resolve_non_null(class2); Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); return (jboolean) Reflection::is_same_class_package(klass1, klass2); JVM_END // Printing support ////////////////////////////////////////////////// extern "C" { ATTRIBUTE_PRINTF(3, 0) int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { // see bug 4399518, 4417214 if ((intptr_t)count <= 0) return -1; int result = vsnprintf(str, count, fmt, args); // Note: on truncation vsnprintf(3) on Unix returns numbers of // characters which would have been written had the buffer been large // enough; on Windows, it returns -1. We handle both cases here and // always return -1, and perform null termination. if ((result > 0 && (size_t)result >= count) || result == -1) { str[count - 1] = '\0'; result = -1; } return result; } ATTRIBUTE_PRINTF(3, 0) int jio_snprintf(char *str, size_t count, const char *fmt, ...) { va_list args; int len; va_start(args, fmt); len = jio_vsnprintf(str, count, fmt, args); va_end(args); return len; } ATTRIBUTE_PRINTF(2,3) int jio_fprintf(FILE* f, const char *fmt, ...) { int len; va_list args; va_start(args, fmt); len = jio_vfprintf(f, fmt, args); va_end(args); return len; } ATTRIBUTE_PRINTF(2, 0) int jio_vfprintf(FILE* f, const char *fmt, va_list args) { if (Arguments::vfprintf_hook() != NULL) { return Arguments::vfprintf_hook()(f, fmt, args); } else { return vfprintf(f, fmt, args); } } ATTRIBUTE_PRINTF(1, 2) JNIEXPORT int jio_printf(const char *fmt, ...) { int len; va_list args; va_start(args, fmt); len = jio_vfprintf(defaultStream::output_stream(), fmt, args); va_end(args); return len; } // HotSpot specific jio method void jio_print(const char* s) { // Try to make this function as atomic as possible. if (Arguments::vfprintf_hook() != NULL) { jio_fprintf(defaultStream::output_stream(), "%s", s); } else { // Make an unused local variable to avoid warning from gcc 4.x compiler. size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); } } } // Extern C // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock // to prevent the target thread from exiting after we have a pointer to the C++ Thread or // OSThread objects. The exception to this rule is when the target object is the thread // doing the operation, in which case we know that the thread won't exit until the // operation is done (all exits being voluntary). There are a few cases where it is // rather silly to do operations on yourself, like resuming yourself or asking whether // you are alive. While these can still happen, they are not subject to deadlocks if // the lock is held while the operation occurs (this is not the case for suspend, for // instance), and are very unlikely. Because IsAlive needs to be fast and its // implementation is local to this file, we always lock Threads_lock for that one. static void thread_entry(JavaThread* thread, TRAPS) { HandleMark hm(THREAD); Handle obj(THREAD, thread->threadObj()); JavaValue result(T_VOID); JavaCalls::call_virtual(&result, obj, KlassHandle(THREAD, SystemDictionary::Thread_klass()), vmSymbols::run_method_name(), vmSymbols::void_method_signature(), THREAD); } JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) JVMWrapper("JVM_StartThread"); JavaThread *native_thread = NULL; // We cannot hold the Threads_lock when we throw an exception, // due to rank ordering issues. Example: we might need to grab the // Heap_lock while we construct the exception. bool throw_illegal_thread_state = false; // We must release the Threads_lock before we can post a jvmti event // in Thread::start. { // Ensure that the C++ Thread and OSThread structures aren't freed before // we operate. MutexLocker mu(Threads_lock); // Since JDK 5 the java.lang.Thread threadStatus is used to prevent // re-starting an already started thread, so we should usually find // that the JavaThread is null. However for a JNI attached thread // there is a small window between the Thread object being created // (with its JavaThread set) and the update to its threadStatus, so we // have to check for this if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { throw_illegal_thread_state = true; } else { // We could also check the stillborn flag to see if this thread was already stopped, but // for historical reasons we let the thread detect that itself when it starts running jlong size = java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); // Allocate the C++ Thread structure and create the native thread. The // stack size retrieved from java is signed, but the constructor takes // size_t (an unsigned type), so avoid passing negative values which would // result in really large stacks. size_t sz = size > 0 ? (size_t) size : 0; native_thread = new JavaThread(&thread_entry, sz); // At this point it may be possible that no osthread was created for the // JavaThread due to lack of memory. Check for this situation and throw // an exception if necessary. Eventually we may want to change this so // that we only grab the lock if the thread was created successfully - // then we can also do this check and throw the exception in the // JavaThread constructor. if (native_thread->osthread() != NULL) { // Note: the current thread is not being used within "prepare". native_thread->prepare(jthread); } } } if (throw_illegal_thread_state) { THROW(vmSymbols::java_lang_IllegalThreadStateException()); } assert(native_thread != NULL, "Starting null thread?"); if (native_thread->osthread() == NULL) { // No one should hold a reference to the 'native_thread'. delete native_thread; if (JvmtiExport::should_post_resource_exhausted()) { JvmtiExport::post_resource_exhausted( JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, os::native_thread_creation_failed_msg()); } THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), os::native_thread_creation_failed_msg()); } Thread::start(native_thread); JVM_END // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints // before the quasi-asynchronous exception is delivered. This is a little obtrusive, // but is thought to be reliable and simple. In the case, where the receiver is the // same thread as the sender, no safepoint is needed. JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) JVMWrapper("JVM_StopThread"); oop java_throwable = JNIHandles::resolve(throwable); if (java_throwable == NULL) { THROW(vmSymbols::java_lang_NullPointerException()); } oop java_thread = JNIHandles::resolve_non_null(jthread); JavaThread* receiver = java_lang_Thread::thread(java_thread); Events::log_exception(JavaThread::current(), "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", p2i(receiver), p2i((address)java_thread), p2i(throwable)); // First check if thread is alive if (receiver != NULL) { // Check if exception is getting thrown at self (use oop equality, since the // target object might exit) if (java_thread == thread->threadObj()) { THROW_OOP(java_throwable); } else { // Enques a VM_Operation to stop all threads and then deliver the exception... Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); } } else { // Either: // - target thread has not been started before being stopped, or // - target thread already terminated // We could read the threadStatus to determine which case it is // but that is overkill as it doesn't matter. We must set the // stillborn flag for the first case, and if the thread has already // exited setting this flag has no affect java_lang_Thread::set_stillborn(java_thread); } JVM_END JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) JVMWrapper("JVM_IsThreadAlive"); oop thread_oop = JNIHandles::resolve_non_null(jthread); return java_lang_Thread::is_alive(thread_oop); JVM_END JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) JVMWrapper("JVM_SuspendThread"); oop java_thread = JNIHandles::resolve_non_null(jthread); JavaThread* receiver = java_lang_Thread::thread(java_thread); if (receiver != NULL) { // thread has run and has not exited (still on threads list) { MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); if (receiver->is_external_suspend()) { // Don't allow nested external suspend requests. We can't return // an error from this interface so just ignore the problem. return; } if (receiver->is_exiting()) { // thread is in the process of exiting return; } receiver->set_external_suspend(); } // java_suspend() will catch threads in the process of exiting // and will ignore them. receiver->java_suspend(); // It would be nice to have the following assertion in all the // time, but it is possible for a racing resume request to have // resumed this thread right after we suspended it. Temporarily // enable this assertion if you are chasing a different kind of // bug. // // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || // receiver->is_being_ext_suspended(), "thread is not suspended"); } JVM_END JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) JVMWrapper("JVM_ResumeThread"); // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. // We need to *always* get the threads lock here, since this operation cannot be allowed during // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other // threads randomly resumes threads, then a thread might not be suspended when the safepoint code // looks at it. MutexLocker ml(Threads_lock); JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); if (thr != NULL) { // the thread has run and is not in the process of exiting thr->java_resume(); } JVM_END JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) JVMWrapper("JVM_SetThreadPriority"); // Ensure that the C++ Thread and OSThread structures aren't freed before we operate MutexLocker ml(Threads_lock); oop java_thread = JNIHandles::resolve_non_null(jthread); java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); JavaThread* thr = java_lang_Thread::thread(java_thread); if (thr != NULL) { // Thread not yet started; priority pushed down when it is Thread::set_priority(thr, (ThreadPriority)prio); } JVM_END JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) JVMWrapper("JVM_Yield"); if (os::dont_yield()) return; HOTSPOT_THREAD_YIELD(); // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield. // Critical for similar threading behaviour if (ConvertYieldToSleep) { os::sleep(thread, MinSleepInterval, false); } else { os::naked_yield(); } JVM_END JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) JVMWrapper("JVM_Sleep"); if (millis < 0) { THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); } if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); } // Save current thread state and restore it at the end of this block. // And set new thread state to SLEEPING. JavaThreadSleepState jtss(thread); HOTSPOT_THREAD_SLEEP_BEGIN(millis); EventThreadSleep event; if (millis == 0) { // When ConvertSleepToYield is on, this matches the classic VM implementation of // JVM_Sleep. Critical for similar threading behaviour (Win32) // It appears that in certain GUI contexts, it may be beneficial to do a short sleep // for SOLARIS if (ConvertSleepToYield) { os::naked_yield(); } else { ThreadState old_state = thread->osthread()->get_state(); thread->osthread()->set_state(SLEEPING); os::sleep(thread, MinSleepInterval, false); thread->osthread()->set_state(old_state); } } else { ThreadState old_state = thread->osthread()->get_state(); thread->osthread()->set_state(SLEEPING); if (os::sleep(thread, millis, true) == OS_INTRPT) { // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on // us while we were sleeping. We do not overwrite those. if (!HAS_PENDING_EXCEPTION) { if (event.should_commit()) { event.set_time(millis); event.commit(); } HOTSPOT_THREAD_SLEEP_END(1); // TODO-FIXME: THROW_MSG returns which means we will not call set_state() // to properly restore the thread state. That's likely wrong. THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); } } thread->osthread()->set_state(old_state); } if (event.should_commit()) { event.set_time(millis); event.commit(); } HOTSPOT_THREAD_SLEEP_END(0); JVM_END JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) JVMWrapper("JVM_CurrentThread"); oop jthread = thread->threadObj(); assert (thread != NULL, "no current thread!"); return JNIHandles::make_local(env, jthread); JVM_END JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) JVMWrapper("JVM_CountStackFrames"); // Ensure that the C++ Thread and OSThread structures aren't freed before we operate oop java_thread = JNIHandles::resolve_non_null(jthread); bool throw_illegal_thread_state = false; int count = 0; { MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); // We need to re-resolve the java_thread, since a GC might have happened during the // acquire of the lock JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); if (thr == NULL) { // do nothing } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { // Check whether this java thread has been suspended already. If not, throws // IllegalThreadStateException. We defer to throw that exception until // Threads_lock is released since loading exception class has to leave VM. // The correct way to test a thread is actually suspended is // wait_for_ext_suspend_completion(), but we can't call that while holding // the Threads_lock. The above tests are sufficient for our purposes // provided the walkability of the stack is stable - which it isn't // 100% but close enough for most practical purposes. throw_illegal_thread_state = true; } else { // Count all java activation, i.e., number of vframes for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { // Native frames are not counted if (!vfst.method()->is_native()) count++; } } } if (throw_illegal_thread_state) { THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), "this thread is not suspended"); } return count; JVM_END // Consider: A better way to implement JVM_Interrupt() is to acquire // Threads_lock to resolve the jthread into a Thread pointer, fetch // Thread->platformevent, Thread->native_thr, Thread->parker, etc., // drop Threads_lock, and the perform the unpark() and thr_kill() operations // outside the critical section. Threads_lock is hot so we want to minimize // the hold-time. A cleaner interface would be to decompose interrupt into // two steps. The 1st phase, performed under Threads_lock, would return // a closure that'd be invoked after Threads_lock was dropped. // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and // admit spurious wakeups. JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) JVMWrapper("JVM_Interrupt"); // Ensure that the C++ Thread and OSThread structures aren't freed before we operate oop java_thread = JNIHandles::resolve_non_null(jthread); MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); // We need to re-resolve the java_thread, since a GC might have happened during the // acquire of the lock JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); if (thr != NULL) { Thread::interrupt(thr); } JVM_END JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) JVMWrapper("JVM_IsInterrupted"); // Ensure that the C++ Thread and OSThread structures aren't freed before we operate oop java_thread = JNIHandles::resolve_non_null(jthread); MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); // We need to re-resolve the java_thread, since a GC might have happened during the // acquire of the lock JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); if (thr == NULL) { return JNI_FALSE; } else { return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); } JVM_END // Return true iff the current thread has locked the object passed in JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) JVMWrapper("JVM_HoldsLock"); assert(THREAD->is_Java_thread(), "sanity check"); if (obj == NULL) { THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); } Handle h_obj(THREAD, JNIHandles::resolve(obj)); return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); JVM_END JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) JVMWrapper("JVM_DumpAllStacks"); VM_PrintThreads op; VMThread::execute(&op); if (JvmtiExport::should_post_data_dump()) { JvmtiExport::post_data_dump(); } JVM_END JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) JVMWrapper("JVM_SetNativeThreadName"); ResourceMark rm(THREAD); oop java_thread = JNIHandles::resolve_non_null(jthread); JavaThread* thr = java_lang_Thread::thread(java_thread); // Thread naming only supported for the current thread, doesn't work for // target threads. if (Thread::current() == thr && !thr->has_attached_via_jni()) { // we don't set the name of an attached thread to avoid stepping // on other programs const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); os::set_native_thread_name(thread_name); } JVM_END // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { assert(jthread->is_Java_thread(), "must be a Java thread"); if (jthread->privileged_stack_top() == NULL) return false; if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { oop loader = jthread->privileged_stack_top()->class_loader(); if (loader == NULL) return true; bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); if (trusted) return true; } return false; } JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) JVMWrapper("JVM_CurrentLoadedClass"); ResourceMark rm(THREAD); for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { // if a method in a class in a trusted loader is in a doPrivileged, return NULL bool trusted = is_trusted_frame(thread, &vfst); if (trusted) return NULL; Method* m = vfst.method(); if (!m->is_native()) { InstanceKlass* holder = m->method_holder(); oop loader = holder->class_loader(); if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { return (jclass) JNIHandles::make_local(env, holder->java_mirror()); } } } return NULL; JVM_END JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) JVMWrapper("JVM_CurrentClassLoader"); ResourceMark rm(THREAD); for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { // if a method in a class in a trusted loader is in a doPrivileged, return NULL bool trusted = is_trusted_frame(thread, &vfst); if (trusted) return NULL; Method* m = vfst.method(); if (!m->is_native()) { InstanceKlass* holder = m->method_holder(); assert(holder->is_klass(), "just checking"); oop loader = holder->class_loader(); if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { return JNIHandles::make_local(env, loader); } } } return NULL; JVM_END JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) JVMWrapper("JVM_GetClassContext"); ResourceMark rm(THREAD); JvmtiVMObjectAllocEventCollector oam; vframeStream vfst(thread); if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { // This must only be called from SecurityManager.getClassContext Method* m = vfst.method(); if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && m->name() == vmSymbols::getClassContext_name() && m->signature() == vmSymbols::void_class_array_signature())) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); } } // Collect method holders GrowableArray* klass_array = new GrowableArray(); for (; !vfst.at_end(); vfst.security_next()) { Method* m = vfst.method(); // Native frames are not returned if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { Klass* holder = m->method_holder(); assert(holder->is_klass(), "just checking"); klass_array->append(holder); } } // Create result array of type [Ljava/lang/Class; objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); // Fill in mirrors corresponding to method holders for (int i = 0; i < klass_array->length(); i++) { result->obj_at_put(i, klass_array->at(i)->java_mirror()); } return (jobjectArray) JNIHandles::make_local(env, result); JVM_END JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) JVMWrapper("JVM_ClassDepth"); ResourceMark rm(THREAD); Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); const char* str = java_lang_String::as_utf8_string(class_name_str()); TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); if (class_name_sym == NULL) { return -1; } int depth = 0; for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { if (!vfst.method()->is_native()) { InstanceKlass* holder = vfst.method()->method_holder(); assert(holder->is_klass(), "just checking"); if (holder->name() == class_name_sym) { return depth; } depth++; } } return -1; JVM_END JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) JVMWrapper("JVM_ClassLoaderDepth"); ResourceMark rm(THREAD); int depth = 0; for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { // if a method in a class in a trusted loader is in a doPrivileged, return -1 bool trusted = is_trusted_frame(thread, &vfst); if (trusted) return -1; Method* m = vfst.method(); if (!m->is_native()) { InstanceKlass* holder = m->method_holder(); assert(holder->is_klass(), "just checking"); oop loader = holder->class_loader(); if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { return depth; } depth++; } } return -1; JVM_END // java.lang.Package //////////////////////////////////////////////////////////////// JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) JVMWrapper("JVM_GetSystemPackage"); ResourceMark rm(THREAD); JvmtiVMObjectAllocEventCollector oam; char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); oop result = ClassLoader::get_system_package(str, CHECK_NULL); return (jstring) JNIHandles::make_local(result); JVM_END JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) JVMWrapper("JVM_GetSystemPackages"); JvmtiVMObjectAllocEventCollector oam; objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); return (jobjectArray) JNIHandles::make_local(result); JVM_END // java.lang.ref.Reference /////////////////////////////////////////////////////////////// JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) JVMWrapper("JVM_GetAndClearReferencePendingList"); MonitorLockerEx ml(Heap_lock); oop ref = Universe::reference_pending_list(); if (ref != NULL) { Universe::set_reference_pending_list(NULL); } return JNIHandles::make_local(env, ref); JVM_END JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) JVMWrapper("JVM_HasReferencePendingList"); MonitorLockerEx ml(Heap_lock); return Universe::has_reference_pending_list(); JVM_END JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) JVMWrapper("JVM_WaitForReferencePendingList"); MonitorLockerEx ml(Heap_lock); while (!Universe::has_reference_pending_list()) { ml.wait(); } JVM_END // ObjectInputStream /////////////////////////////////////////////////////////////// bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { if (current_class == NULL) { return true; } if ((current_class == field_class) || access.is_public()) { return true; } if (access.is_protected()) { // See if current_class is a subclass of field_class if (current_class->is_subclass_of(field_class)) { return true; } } return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); } // Return the first user-defined class loader up the execution stack, or null // if only code from the bootstrap or platform class loader is on the stack. JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection oop loader = vfst.method()->method_holder()->class_loader(); if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { return JNIHandles::make_local(env, loader); } } return NULL; JVM_END // Array /////////////////////////////////////////////////////////////////////////////////////////// // resolve array handle and check arguments static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { if (arr == NULL) { THROW_0(vmSymbols::java_lang_NullPointerException()); } oop a = JNIHandles::resolve_non_null(arr); if (!a->is_array()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); } else if (type_array_only && !a->is_typeArray()) { THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); } return arrayOop(a); } JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) JVMWrapper("JVM_GetArrayLength"); arrayOop a = check_array(env, arr, false, CHECK_0); return a->length(); JVM_END JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) JVMWrapper("JVM_Array_Get"); JvmtiVMObjectAllocEventCollector oam; arrayOop a = check_array(env, arr, false, CHECK_NULL); jvalue value; BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); oop box = Reflection::box(&value, type, CHECK_NULL); return JNIHandles::make_local(env, box); JVM_END JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) JVMWrapper("JVM_GetPrimitiveArrayElement"); jvalue value; value.i = 0; // to initialize value before getting used in CHECK arrayOop a = check_array(env, arr, true, CHECK_(value)); assert(a->is_typeArray(), "just checking"); BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); BasicType wide_type = (BasicType) wCode; if (type != wide_type) { Reflection::widen(&value, type, wide_type, CHECK_(value)); } return value; JVM_END JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) JVMWrapper("JVM_SetArrayElement"); arrayOop a = check_array(env, arr, false, CHECK); oop box = JNIHandles::resolve(val); jvalue value; value.i = 0; // to initialize value before getting used in CHECK BasicType value_type; if (a->is_objArray()) { // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array value_type = Reflection::unbox_for_regular_object(box, &value); } else { value_type = Reflection::unbox_for_primitive(box, &value, CHECK); } Reflection::array_set(&value, a, index, value_type, CHECK); JVM_END JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) JVMWrapper("JVM_SetPrimitiveArrayElement"); arrayOop a = check_array(env, arr, true, CHECK); assert(a->is_typeArray(), "just checking"); BasicType value_type = (BasicType) vCode; Reflection::array_set(&v, a, index, value_type, CHECK); JVM_END JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) JVMWrapper("JVM_NewArray"); JvmtiVMObjectAllocEventCollector oam; oop element_mirror = JNIHandles::resolve(eltClass); oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); return JNIHandles::make_local(env, result); JVM_END JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) JVMWrapper("JVM_NewMultiArray"); JvmtiVMObjectAllocEventCollector oam; arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); oop element_mirror = JNIHandles::resolve(eltClass); assert(dim_array->is_typeArray(), "just checking"); oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); return JNIHandles::make_local(env, result); JVM_END // Library support /////////////////////////////////////////////////////////////////////////// JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) //%note jvm_ct JVMWrapper("JVM_LoadLibrary"); char ebuf[1024]; void *load_result; { ThreadToNativeFromVM ttnfvm(thread); load_result = os::dll_load(name, ebuf, sizeof ebuf); } if (load_result == NULL) { char msg[1024]; jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); // Since 'ebuf' may contain a string encoded using // platform encoding scheme, we need to pass // Exceptions::unsafe_to_utf8 to the new_exception method // as the last argument. See bug 6367357. Handle h_exception = Exceptions::new_exception(thread, vmSymbols::java_lang_UnsatisfiedLinkError(), msg, Exceptions::unsafe_to_utf8); THROW_HANDLE_0(h_exception); } return load_result; JVM_END JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) JVMWrapper("JVM_UnloadLibrary"); os::dll_unload(handle); JVM_END JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) JVMWrapper("JVM_FindLibraryEntry"); return os::dll_lookup(handle, name); JVM_END // JNI version /////////////////////////////////////////////////////////////////////////////// JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) JVMWrapper("JVM_IsSupportedJNIVersion"); return Threads::is_supported_jni_version_including_1_1(version); JVM_END // String support /////////////////////////////////////////////////////////////////////////// JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) JVMWrapper("JVM_InternString"); JvmtiVMObjectAllocEventCollector oam; if (str == NULL) return NULL; oop string = JNIHandles::resolve_non_null(str); oop result = StringTable::intern(string, CHECK_NULL); return (jstring) JNIHandles::make_local(env, result); JVM_END // Raw monitor support ////////////////////////////////////////////////////////////////////// // The lock routine below calls lock_without_safepoint_check in order to get a raw lock // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check // that only works with java threads. JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { VM_Exit::block_if_vm_exited(); JVMWrapper("JVM_RawMonitorCreate"); return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); } JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { VM_Exit::block_if_vm_exited(); JVMWrapper("JVM_RawMonitorDestroy"); delete ((Mutex*) mon); } JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { VM_Exit::block_if_vm_exited(); JVMWrapper("JVM_RawMonitorEnter"); ((Mutex*) mon)->jvm_raw_lock(); return 0; } JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { VM_Exit::block_if_vm_exited(); JVMWrapper("JVM_RawMonitorExit"); ((Mutex*) mon)->jvm_raw_unlock(); } // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, Handle loader, Handle protection_domain, jboolean throwError, TRAPS) { // Security Note: // The Java level wrapper will perform the necessary security check allowing // us to pass the NULL as the initiating class loader. The VM is responsible for // the checkPackageAccess relative to the initiating class loader via the // protection_domain. The protection_domain is passed as NULL by the java code // if there is no security manager in 3-arg Class.forName(). Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); KlassHandle klass_handle(THREAD, klass); // Check if we should initialize the class if (init && klass_handle->is_instance_klass()) { klass_handle->initialize(CHECK_NULL); } return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror()); } // Method /////////////////////////////////////////////////////////////////////////////////////////// JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) JVMWrapper("JVM_InvokeMethod"); Handle method_handle; if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { method_handle = Handle(THREAD, JNIHandles::resolve(method)); Handle receiver(THREAD, JNIHandles::resolve(obj)); objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); jobject res = JNIHandles::make_local(env, result); if (JvmtiExport::should_post_vm_object_alloc()) { oop ret_type = java_lang_reflect_Method::return_type(method_handle()); assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); if (java_lang_Class::is_primitive(ret_type)) { // Only for primitive type vm allocates memory for java object. // See box() method. JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); } } return res; } else { THROW_0(vmSymbols::java_lang_StackOverflowError()); } JVM_END JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) JVMWrapper("JVM_NewInstanceFromConstructor"); oop constructor_mirror = JNIHandles::resolve(c); objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); jobject res = JNIHandles::make_local(env, result); if (JvmtiExport::should_post_vm_object_alloc()) { JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); } return res; JVM_END // Atomic /////////////////////////////////////////////////////////////////////////////////////////// JVM_LEAF(jboolean, JVM_SupportsCX8()) JVMWrapper("JVM_SupportsCX8"); return VM_Version::supports_cx8(); JVM_END // Returns an array of all live Thread objects (VM internal JavaThreads, // jvmti agent threads, and JNI attaching threads are skipped) // See CR 6404306 regarding JNI attaching threads JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) ResourceMark rm(THREAD); ThreadsListEnumerator tle(THREAD, false, false); JvmtiVMObjectAllocEventCollector oam; int num_threads = tle.num_threads(); objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); objArrayHandle threads_ah(THREAD, r); for (int i = 0; i < num_threads; i++) { Handle h = tle.get_threadObj(i); threads_ah->obj_at_put(i, h()); } return (jobjectArray) JNIHandles::make_local(env, threads_ah()); JVM_END // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods // Return StackTraceElement[][], each element is the stack trace of a thread in // the corresponding entry in the given threads array JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) JVMWrapper("JVM_DumpThreads"); JvmtiVMObjectAllocEventCollector oam; // Check if threads is null if (threads == NULL) { THROW_(vmSymbols::java_lang_NullPointerException(), 0); } objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); objArrayHandle ah(THREAD, a); int num_threads = ah->length(); // check if threads is non-empty array if (num_threads == 0) { THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); } // check if threads is not an array of objects of Thread class Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); if (k != SystemDictionary::Thread_klass()) { THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); } ResourceMark rm(THREAD); GrowableArray* thread_handle_array = new GrowableArray(num_threads); for (int i = 0; i < num_threads; i++) { oop thread_obj = ah->obj_at(i); instanceHandle h(THREAD, (instanceOop) thread_obj); thread_handle_array->append(h); } Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); return (jobjectArray)JNIHandles::make_local(env, stacktraces()); JVM_END // JVM monitoring and management support JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) return Management::get_jmm_interface(version); JVM_END // com.sun.tools.attach.VirtualMachine agent properties support // // Initialize the agent properties with the properties maintained in the VM JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) JVMWrapper("JVM_InitAgentProperties"); ResourceMark rm; Handle props(THREAD, JNIHandles::resolve_non_null(properties)); PUTPROP(props, "sun.java.command", Arguments::java_command()); PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); return properties; JVM_END JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) { JVMWrapper("JVM_GetEnclosingMethodInfo"); JvmtiVMObjectAllocEventCollector oam; if (ofClass == NULL) { return NULL; } Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); // Special handling for primitive objects if (java_lang_Class::is_primitive(mirror())) { return NULL; } Klass* k = java_lang_Class::as_Klass(mirror()); if (!k->is_instance_klass()) { return NULL; } instanceKlassHandle ik_h(THREAD, k); int encl_method_class_idx = ik_h->enclosing_method_class_index(); if (encl_method_class_idx == 0) { return NULL; } objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); objArrayHandle dest(THREAD, dest_o); Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL); dest->obj_at_put(0, enc_k->java_mirror()); int encl_method_method_idx = ik_h->enclosing_method_method_index(); if (encl_method_method_idx != 0) { Symbol* sym = ik_h->constants()->symbol_at( extract_low_short_from_int( ik_h->constants()->name_and_type_at(encl_method_method_idx))); Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); dest->obj_at_put(1, str()); sym = ik_h->constants()->symbol_at( extract_high_short_from_int( ik_h->constants()->name_and_type_at(encl_method_method_idx))); str = java_lang_String::create_from_symbol(sym, CHECK_NULL); dest->obj_at_put(2, str()); } return (jobjectArray) JNIHandles::make_local(dest()); } JVM_END JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) { memset(info, 0, info_size); info->jvm_version = Abstract_VM_Version::jvm_version(); info->patch_version = Abstract_VM_Version::vm_patch_version(); // when we add a new capability in the jvm_version_info struct, we should also // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat // counter defined in runtimeService.cpp. info->is_attachable = AttachListener::is_attach_supported(); } JVM_END // Returns an array of java.lang.String objects containing the input arguments to the VM. JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) ResourceMark rm(THREAD); if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { return NULL; } char** vm_flags = Arguments::jvm_flags_array(); char** vm_args = Arguments::jvm_args_array(); int num_flags = Arguments::num_jvm_flags(); int num_args = Arguments::num_jvm_args(); instanceKlassHandle ik (THREAD, SystemDictionary::String_klass()); objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL); objArrayHandle result_h(THREAD, r); int index = 0; for (int j = 0; j < num_flags; j++, index++) { Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); result_h->obj_at_put(index, h()); } for (int i = 0; i < num_args; i++, index++) { Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); result_h->obj_at_put(index, h()); } return (jobjectArray) JNIHandles::make_local(env, result_h()); JVM_END JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) return os::get_signal_number(name); JVM_END