1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/javaClasses.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "gc_interface/collectedHeap.inline.hpp" 33 #include "interpreter/bytecode.hpp" 34 #include "memory/oopFactory.hpp" 35 #include "memory/universe.inline.hpp" 36 #include "oops/fieldStreams.hpp" 37 #include "oops/instanceKlass.hpp" 38 #include "oops/objArrayKlass.hpp" 39 #include "oops/method.hpp" 40 #include "prims/jvm.h" 41 #include "prims/jvm_misc.hpp" 42 #include "prims/jvmtiExport.hpp" 43 #include "prims/jvmtiThreadState.hpp" 44 #include "prims/nativeLookup.hpp" 45 #include "prims/privilegedStack.hpp" 46 #include "runtime/arguments.hpp" 47 #include "runtime/atomic.inline.hpp" 48 #include "runtime/dtraceJSDT.hpp" 49 #include "runtime/handles.inline.hpp" 50 #include "runtime/init.hpp" 51 #include "runtime/interfaceSupport.hpp" 52 #include "runtime/java.hpp" 53 #include "runtime/javaCalls.hpp" 54 #include "runtime/jfieldIDWorkaround.hpp" 55 #include "runtime/orderAccess.inline.hpp" 56 #include "runtime/os.inline.hpp" 57 #include "runtime/perfData.hpp" 58 #include "runtime/reflection.hpp" 59 #include "runtime/thread.inline.hpp" 60 #include "runtime/vframe.hpp" 61 #include "runtime/vm_operations.hpp" 62 #include "runtime/vm_version.hpp" 63 #include "services/attachListener.hpp" 64 #include "services/management.hpp" 65 #include "services/threadService.hpp" 66 #include "trace/tracing.hpp" 67 #include "utilities/copy.hpp" 68 #include "utilities/defaultStream.hpp" 69 #include "utilities/dtrace.hpp" 70 #include "utilities/events.hpp" 71 #include "utilities/histogram.hpp" 72 #include "utilities/macros.hpp" 73 #include "utilities/top.hpp" 74 #include "utilities/utf8.hpp" 75 #if INCLUDE_CDS 76 #include "classfile/sharedClassUtil.hpp" 77 #include "classfile/systemDictionaryShared.hpp" 78 #endif 79 #ifdef TARGET_OS_FAMILY_linux 80 # include "jvm_linux.h" 81 #endif 82 #ifdef TARGET_OS_FAMILY_solaris 83 # include "jvm_solaris.h" 84 #endif 85 #ifdef TARGET_OS_FAMILY_windows 86 # include "jvm_windows.h" 87 #endif 88 #ifdef TARGET_OS_FAMILY_aix 89 # include "jvm_aix.h" 90 #endif 91 #ifdef TARGET_OS_FAMILY_bsd 92 # include "jvm_bsd.h" 93 #endif 94 95 #include <errno.h> 96 97 /* 98 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 99 such ctors and calls MUST NOT come between an oop declaration/init and its 100 usage because if objects are move this may cause various memory stomps, bus 101 errors and segfaults. Here is a cookbook for causing so called "naked oop 102 failures": 103 104 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 105 JVMWrapper("JVM_GetClassDeclaredFields"); 106 107 // Object address to be held directly in mirror & not visible to GC 108 oop mirror = JNIHandles::resolve_non_null(ofClass); 109 110 // If this ctor can hit a safepoint, moving objects around, then 111 ComplexConstructor foo; 112 113 // Boom! mirror may point to JUNK instead of the intended object 114 (some dereference of mirror) 115 116 // Here's another call that may block for GC, making mirror stale 117 MutexLocker ml(some_lock); 118 119 // And here's an initializer that can result in a stale oop 120 // all in one step. 121 oop o = call_that_can_throw_exception(TRAPS); 122 123 124 The solution is to keep the oop declaration BELOW the ctor or function 125 call that might cause a GC, do another resolve to reassign the oop, or 126 consider use of a Handle instead of an oop so there is immunity from object 127 motion. But note that the "QUICK" entries below do not have a handlemark 128 and thus can only support use of handles passed in. 129 */ 130 131 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 132 ResourceMark rm; 133 int line_number = -1; 134 const char * source_file = NULL; 135 const char * trace = "explicit"; 136 InstanceKlass* caller = NULL; 137 JavaThread* jthread = JavaThread::current(); 138 if (jthread->has_last_Java_frame()) { 139 vframeStream vfst(jthread); 140 141 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 142 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 143 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 144 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 145 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 146 147 Method* last_caller = NULL; 148 149 while (!vfst.at_end()) { 150 Method* m = vfst.method(); 151 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 152 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 153 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 154 break; 155 } 156 last_caller = m; 157 vfst.next(); 158 } 159 // if this is called from Class.forName0 and that is called from Class.forName, 160 // then print the caller of Class.forName. If this is Class.loadClass, then print 161 // that caller, otherwise keep quiet since this should be picked up elsewhere. 162 bool found_it = false; 163 if (!vfst.at_end() && 164 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 165 vfst.method()->name() == vmSymbols::forName0_name()) { 166 vfst.next(); 167 if (!vfst.at_end() && 168 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 169 vfst.method()->name() == vmSymbols::forName_name()) { 170 vfst.next(); 171 found_it = true; 172 } 173 } else if (last_caller != NULL && 174 last_caller->method_holder()->name() == 175 vmSymbols::java_lang_ClassLoader() && 176 (last_caller->name() == vmSymbols::loadClassInternal_name() || 177 last_caller->name() == vmSymbols::loadClass_name())) { 178 found_it = true; 179 } else if (!vfst.at_end()) { 180 if (vfst.method()->is_native()) { 181 // JNI call 182 found_it = true; 183 } 184 } 185 if (found_it && !vfst.at_end()) { 186 // found the caller 187 caller = vfst.method()->method_holder(); 188 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 189 if (line_number == -1) { 190 // show method name if it's a native method 191 trace = vfst.method()->name_and_sig_as_C_string(); 192 } 193 Symbol* s = caller->source_file_name(); 194 if (s != NULL) { 195 source_file = s->as_C_string(); 196 } 197 } 198 } 199 if (caller != NULL) { 200 if (to_class != caller) { 201 const char * from = caller->external_name(); 202 const char * to = to_class->external_name(); 203 // print in a single call to reduce interleaving between threads 204 if (source_file != NULL) { 205 tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace); 206 } else { 207 tty->print("RESOLVE %s %s (%s)\n", from, to, trace); 208 } 209 } 210 } 211 } 212 213 void trace_class_resolution(Klass* to_class) { 214 EXCEPTION_MARK; 215 trace_class_resolution_impl(to_class, THREAD); 216 if (HAS_PENDING_EXCEPTION) { 217 CLEAR_PENDING_EXCEPTION; 218 } 219 } 220 221 // Wrapper to trace JVM functions 222 223 #ifdef ASSERT 224 class JVMTraceWrapper : public StackObj { 225 public: 226 JVMTraceWrapper(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) { 227 if (TraceJVMCalls) { 228 va_list ap; 229 va_start(ap, format); 230 tty->print("JVM "); 231 tty->vprint_cr(format, ap); 232 va_end(ap); 233 } 234 } 235 }; 236 237 Histogram* JVMHistogram; 238 volatile jint JVMHistogram_lock = 0; 239 240 class JVMHistogramElement : public HistogramElement { 241 public: 242 JVMHistogramElement(const char* name); 243 }; 244 245 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 246 _name = elementName; 247 uintx count = 0; 248 249 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 250 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 251 count +=1; 252 if ( (WarnOnStalledSpinLock > 0) 253 && (count % WarnOnStalledSpinLock == 0)) { 254 warning("JVMHistogram_lock seems to be stalled"); 255 } 256 } 257 } 258 259 if(JVMHistogram == NULL) 260 JVMHistogram = new Histogram("JVM Call Counts",100); 261 262 JVMHistogram->add_element(this); 263 Atomic::dec(&JVMHistogram_lock); 264 } 265 266 #define JVMCountWrapper(arg) \ 267 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 268 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 269 270 #define JVMWrapper(arg1) JVMCountWrapper(arg1); JVMTraceWrapper(arg1) 271 #define JVMWrapper2(arg1, arg2) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2) 272 #define JVMWrapper3(arg1, arg2, arg3) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3) 273 #define JVMWrapper4(arg1, arg2, arg3, arg4) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3, arg4) 274 #else 275 #define JVMWrapper(arg1) 276 #define JVMWrapper2(arg1, arg2) 277 #define JVMWrapper3(arg1, arg2, arg3) 278 #define JVMWrapper4(arg1, arg2, arg3, arg4) 279 #endif 280 281 282 // Interface version ///////////////////////////////////////////////////////////////////// 283 284 285 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 286 return JVM_INTERFACE_VERSION; 287 JVM_END 288 289 290 // java.lang.System ////////////////////////////////////////////////////////////////////// 291 292 293 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 294 JVMWrapper("JVM_CurrentTimeMillis"); 295 return os::javaTimeMillis(); 296 JVM_END 297 298 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 299 JVMWrapper("JVM_NanoTime"); 300 return os::javaTimeNanos(); 301 JVM_END 302 303 304 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 305 jobject dst, jint dst_pos, jint length)) 306 JVMWrapper("JVM_ArrayCopy"); 307 // Check if we have null pointers 308 if (src == NULL || dst == NULL) { 309 THROW(vmSymbols::java_lang_NullPointerException()); 310 } 311 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 312 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 313 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop"); 314 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop"); 315 // Do copy 316 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 317 JVM_END 318 319 320 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 321 JavaValue r(T_OBJECT); 322 // public synchronized Object put(Object key, Object value); 323 HandleMark hm(THREAD); 324 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 325 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 326 JavaCalls::call_virtual(&r, 327 props, 328 KlassHandle(THREAD, SystemDictionary::Properties_klass()), 329 vmSymbols::put_name(), 330 vmSymbols::object_object_object_signature(), 331 key_str, 332 value_str, 333 THREAD); 334 } 335 336 337 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 338 339 340 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 341 JVMWrapper("JVM_InitProperties"); 342 ResourceMark rm; 343 344 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 345 346 // System property list includes both user set via -D option and 347 // jvm system specific properties. 348 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 349 PUTPROP(props, p->key(), p->value()); 350 } 351 352 // Convert the -XX:MaxDirectMemorySize= command line flag 353 // to the sun.nio.MaxDirectMemorySize property. 354 // Do this after setting user properties to prevent people 355 // from setting the value with a -D option, as requested. 356 { 357 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 358 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 359 } else { 360 char as_chars[256]; 361 jio_snprintf(as_chars, sizeof(as_chars), UINTX_FORMAT, MaxDirectMemorySize); 362 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 363 } 364 } 365 366 // JVM monitoring and management support 367 // Add the sun.management.compiler property for the compiler's name 368 { 369 #undef CSIZE 370 #if defined(_LP64) || defined(_WIN64) 371 #define CSIZE "64-Bit " 372 #else 373 #define CSIZE 374 #endif // 64bit 375 376 #ifdef TIERED 377 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 378 #else 379 #if defined(COMPILER1) 380 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 381 #elif defined(COMPILER2) 382 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 383 #else 384 const char* compiler_name = ""; 385 #endif // compilers 386 #endif // TIERED 387 388 if (*compiler_name != '\0' && 389 (Arguments::mode() != Arguments::_int)) { 390 PUTPROP(props, "sun.management.compiler", compiler_name); 391 } 392 } 393 394 return properties; 395 JVM_END 396 397 398 /* 399 * Return the temporary directory that the VM uses for the attach 400 * and perf data files. 401 * 402 * It is important that this directory is well-known and the 403 * same for all VM instances. It cannot be affected by configuration 404 * variables such as java.io.tmpdir. 405 */ 406 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 407 JVMWrapper("JVM_GetTemporaryDirectory"); 408 HandleMark hm(THREAD); 409 const char* temp_dir = os::get_temp_directory(); 410 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 411 return (jstring) JNIHandles::make_local(env, h()); 412 JVM_END 413 414 415 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 416 417 extern volatile jint vm_created; 418 419 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 420 before_exit(thread); 421 vm_exit(code); 422 JVM_END 423 424 425 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 426 JVMWrapper("JVM_GC"); 427 if (!DisableExplicitGC) { 428 Universe::heap()->collect(GCCause::_java_lang_system_gc); 429 } 430 JVM_END 431 432 433 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 434 JVMWrapper("JVM_MaxObjectInspectionAge"); 435 return Universe::heap()->millis_since_last_gc(); 436 JVM_END 437 438 439 static inline jlong convert_size_t_to_jlong(size_t val) { 440 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 441 NOT_LP64 (return (jlong)val;) 442 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 443 } 444 445 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 446 JVMWrapper("JVM_TotalMemory"); 447 size_t n = Universe::heap()->capacity(); 448 return convert_size_t_to_jlong(n); 449 JVM_END 450 451 452 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 453 JVMWrapper("JVM_FreeMemory"); 454 CollectedHeap* ch = Universe::heap(); 455 size_t n; 456 { 457 MutexLocker x(Heap_lock); 458 n = ch->capacity() - ch->used(); 459 } 460 return convert_size_t_to_jlong(n); 461 JVM_END 462 463 464 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 465 JVMWrapper("JVM_MaxMemory"); 466 size_t n = Universe::heap()->max_capacity(); 467 return convert_size_t_to_jlong(n); 468 JVM_END 469 470 471 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 472 JVMWrapper("JVM_ActiveProcessorCount"); 473 return os::active_processor_count(); 474 JVM_END 475 476 477 478 // java.lang.Throwable ////////////////////////////////////////////////////// 479 480 481 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 482 JVMWrapper("JVM_FillInStackTrace"); 483 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 484 java_lang_Throwable::fill_in_stack_trace(exception); 485 JVM_END 486 487 488 JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable)) 489 JVMWrapper("JVM_GetStackTraceDepth"); 490 oop exception = JNIHandles::resolve(throwable); 491 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD); 492 JVM_END 493 494 495 JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index)) 496 JVMWrapper("JVM_GetStackTraceElement"); 497 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC 498 oop exception = JNIHandles::resolve(throwable); 499 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL); 500 return JNIHandles::make_local(env, element); 501 JVM_END 502 503 504 // java.lang.Object /////////////////////////////////////////////// 505 506 507 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 508 JVMWrapper("JVM_IHashCode"); 509 // as implemented in the classic virtual machine; return 0 if object is NULL 510 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 511 JVM_END 512 513 514 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 515 JVMWrapper("JVM_MonitorWait"); 516 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 517 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 518 if (JvmtiExport::should_post_monitor_wait()) { 519 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 520 521 // The current thread already owns the monitor and it has not yet 522 // been added to the wait queue so the current thread cannot be 523 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 524 // event handler cannot accidentally consume an unpark() meant for 525 // the ParkEvent associated with this ObjectMonitor. 526 } 527 ObjectSynchronizer::wait(obj, ms, CHECK); 528 JVM_END 529 530 531 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 532 JVMWrapper("JVM_MonitorNotify"); 533 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 534 ObjectSynchronizer::notify(obj, CHECK); 535 JVM_END 536 537 538 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 539 JVMWrapper("JVM_MonitorNotifyAll"); 540 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 541 ObjectSynchronizer::notifyall(obj, CHECK); 542 JVM_END 543 544 545 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 546 JVMWrapper("JVM_Clone"); 547 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 548 const KlassHandle klass (THREAD, obj->klass()); 549 JvmtiVMObjectAllocEventCollector oam; 550 551 #ifdef ASSERT 552 // Just checking that the cloneable flag is set correct 553 if (obj->is_array()) { 554 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 555 } else { 556 guarantee(obj->is_instance(), "should be instanceOop"); 557 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 558 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 559 } 560 #endif 561 562 // Check if class of obj supports the Cloneable interface. 563 // All arrays are considered to be cloneable (See JLS 20.1.5) 564 if (!klass->is_cloneable()) { 565 ResourceMark rm(THREAD); 566 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 567 } 568 569 // Make shallow object copy 570 const int size = obj->size(); 571 oop new_obj_oop = NULL; 572 if (obj->is_array()) { 573 const int length = ((arrayOop)obj())->length(); 574 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 575 } else { 576 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 577 } 578 579 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread 580 // is modifying a reference field in the clonee, a non-oop-atomic copy might 581 // be suspended in the middle of copying the pointer and end up with parts 582 // of two different pointers in the field. Subsequent dereferences will crash. 583 // 4846409: an oop-copy of objects with long or double fields or arrays of same 584 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead 585 // of oops. We know objects are aligned on a minimum of an jlong boundary. 586 // The same is true of StubRoutines::object_copy and the various oop_copy 587 // variants, and of the code generated by the inline_native_clone intrinsic. 588 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); 589 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop, 590 (size_t)align_object_size(size) / HeapWordsPerLong); 591 // Clear the header 592 new_obj_oop->init_mark(); 593 594 // Store check (mark entire object and let gc sort it out) 595 BarrierSet* bs = Universe::heap()->barrier_set(); 596 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); 597 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); 598 599 Handle new_obj(THREAD, new_obj_oop); 600 // Special handling for MemberNames. Since they contain Method* metadata, they 601 // must be registered so that RedefineClasses can fix metadata contained in them. 602 if (java_lang_invoke_MemberName::is_instance(new_obj()) && 603 java_lang_invoke_MemberName::is_method(new_obj())) { 604 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj()); 605 // MemberName may be unresolved, so doesn't need registration until resolved. 606 if (method != NULL) { 607 methodHandle m(THREAD, method); 608 // This can safepoint and redefine method, so need both new_obj and method 609 // in a handle, for two different reasons. new_obj can move, method can be 610 // deleted if nothing is using it on the stack. 611 m->method_holder()->add_member_name(new_obj()); 612 } 613 } 614 615 // Caution: this involves a java upcall, so the clone should be 616 // "gc-robust" by this stage. 617 if (klass->has_finalizer()) { 618 assert(obj->is_instance(), "should be instanceOop"); 619 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 620 new_obj = Handle(THREAD, new_obj_oop); 621 } 622 623 return JNIHandles::make_local(env, new_obj()); 624 JVM_END 625 626 // java.io.File /////////////////////////////////////////////////////////////// 627 628 JVM_LEAF(char*, JVM_NativePath(char* path)) 629 JVMWrapper2("JVM_NativePath (%s)", path); 630 return os::native_path(path); 631 JVM_END 632 633 634 // Misc. class handling /////////////////////////////////////////////////////////// 635 636 637 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 638 JVMWrapper("JVM_GetCallerClass"); 639 640 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 641 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 642 // temporarily for existing code to use until a replacement API is defined. 643 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 644 Klass* k = thread->security_get_caller_class(depth); 645 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 646 } 647 648 // Getting the class of the caller frame. 649 // 650 // The call stack at this point looks something like this: 651 // 652 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 653 // [1] [ @CallerSensitive API.method ] 654 // [.] [ (skipped intermediate frames) ] 655 // [n] [ caller ] 656 vframeStream vfst(thread); 657 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 658 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 659 Method* m = vfst.method(); 660 assert(m != NULL, "sanity"); 661 switch (n) { 662 case 0: 663 // This must only be called from Reflection.getCallerClass 664 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 665 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 666 } 667 // fall-through 668 case 1: 669 // Frame 0 and 1 must be caller sensitive. 670 if (!m->caller_sensitive()) { 671 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 672 } 673 break; 674 default: 675 if (!m->is_ignored_by_security_stack_walk()) { 676 // We have reached the desired frame; return the holder class. 677 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 678 } 679 break; 680 } 681 } 682 return NULL; 683 JVM_END 684 685 686 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 687 JVMWrapper("JVM_FindPrimitiveClass"); 688 oop mirror = NULL; 689 BasicType t = name2type(utf); 690 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 691 mirror = Universe::java_mirror(t); 692 } 693 if (mirror == NULL) { 694 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 695 } else { 696 return (jclass) JNIHandles::make_local(env, mirror); 697 } 698 JVM_END 699 700 701 // Returns a class loaded by the bootstrap class loader; or null 702 // if not found. ClassNotFoundException is not thrown. 703 // FindClassFromBootLoader is exported to the launcher for windows. 704 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 705 const char* name)) 706 JVMWrapper2("JVM_FindClassFromBootLoader %s", name); 707 708 // Java libraries should ensure that name is never null... 709 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 710 // It's impossible to create this class; the name cannot fit 711 // into the constant pool. 712 return NULL; 713 } 714 715 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 716 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 717 if (k == NULL) { 718 return NULL; 719 } 720 721 if (TraceClassResolution) { 722 trace_class_resolution(k); 723 } 724 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 725 JVM_END 726 727 // Find a class with this name in this loader, using the caller's protection domain. 728 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 729 jboolean init, jobject loader, 730 jclass caller)) 731 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name); 732 // Java libraries should ensure that name is never null... 733 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 734 // It's impossible to create this class; the name cannot fit 735 // into the constant pool. 736 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 737 } 738 739 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 740 741 oop loader_oop = JNIHandles::resolve(loader); 742 oop from_class = JNIHandles::resolve(caller); 743 oop protection_domain = NULL; 744 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 745 // NPE. Put it in another way, the bootstrap class loader has all permission and 746 // thus no checkPackageAccess equivalence in the VM class loader. 747 // The caller is also passed as NULL by the java code if there is no security 748 // manager to avoid the performance cost of getting the calling class. 749 if (from_class != NULL && loader_oop != NULL) { 750 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 751 } 752 753 Handle h_loader(THREAD, loader_oop); 754 Handle h_prot(THREAD, protection_domain); 755 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 756 h_prot, false, THREAD); 757 758 if (TraceClassResolution && result != NULL) { 759 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 760 } 761 return result; 762 JVM_END 763 764 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 765 jboolean init, jclass from)) 766 JVMWrapper2("JVM_FindClassFromClass %s", name); 767 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 768 // It's impossible to create this class; the name cannot fit 769 // into the constant pool. 770 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 771 } 772 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 773 oop from_class_oop = JNIHandles::resolve(from); 774 Klass* from_class = (from_class_oop == NULL) 775 ? (Klass*)NULL 776 : java_lang_Class::as_Klass(from_class_oop); 777 oop class_loader = NULL; 778 oop protection_domain = NULL; 779 if (from_class != NULL) { 780 class_loader = from_class->class_loader(); 781 protection_domain = from_class->protection_domain(); 782 } 783 Handle h_loader(THREAD, class_loader); 784 Handle h_prot (THREAD, protection_domain); 785 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 786 h_prot, true, thread); 787 788 if (TraceClassResolution && result != NULL) { 789 // this function is generally only used for class loading during verification. 790 ResourceMark rm; 791 oop from_mirror = JNIHandles::resolve_non_null(from); 792 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 793 const char * from_name = from_class->external_name(); 794 795 oop mirror = JNIHandles::resolve_non_null(result); 796 Klass* to_class = java_lang_Class::as_Klass(mirror); 797 const char * to = to_class->external_name(); 798 tty->print("RESOLVE %s %s (verification)\n", from_name, to); 799 } 800 801 return result; 802 JVM_END 803 804 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 805 if (loader.is_null()) { 806 return; 807 } 808 809 // check whether the current caller thread holds the lock or not. 810 // If not, increment the corresponding counter 811 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 812 ObjectSynchronizer::owner_self) { 813 counter->inc(); 814 } 815 } 816 817 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 818 // and JVM_DefineClassWithSourceCond() 819 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 820 jobject loader, const jbyte *buf, 821 jsize len, jobject pd, const char *source, 822 jboolean verify, TRAPS) { 823 if (source == NULL) source = "__JVM_DefineClass__"; 824 825 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 826 JavaThread* jt = (JavaThread*) THREAD; 827 828 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 829 ClassLoader::perf_define_appclass_selftime(), 830 ClassLoader::perf_define_appclasses(), 831 jt->get_thread_stat()->perf_recursion_counts_addr(), 832 jt->get_thread_stat()->perf_timers_addr(), 833 PerfClassTraceTime::DEFINE_CLASS); 834 835 if (UsePerfData) { 836 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 837 } 838 839 // Since exceptions can be thrown, class initialization can take place 840 // if name is NULL no check for class name in .class stream has to be made. 841 TempNewSymbol class_name = NULL; 842 if (name != NULL) { 843 const int str_len = (int)strlen(name); 844 if (str_len > Symbol::max_length()) { 845 // It's impossible to create this class; the name cannot fit 846 // into the constant pool. 847 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 848 } 849 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 850 } 851 852 ResourceMark rm(THREAD); 853 ClassFileStream st((u1*) buf, len, (char *)source); 854 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 855 if (UsePerfData) { 856 is_lock_held_by_thread(class_loader, 857 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 858 THREAD); 859 } 860 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 861 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader, 862 protection_domain, &st, 863 verify != 0, 864 CHECK_NULL); 865 866 if (TraceClassResolution && k != NULL) { 867 trace_class_resolution(k); 868 } 869 870 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 871 } 872 873 874 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 875 JVMWrapper2("JVM_DefineClass %s", name); 876 877 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD); 878 JVM_END 879 880 881 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 882 JVMWrapper2("JVM_DefineClassWithSource %s", name); 883 884 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD); 885 JVM_END 886 887 JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name, 888 jobject loader, const jbyte *buf, 889 jsize len, jobject pd, 890 const char *source, jboolean verify)) 891 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name); 892 893 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD); 894 JVM_END 895 896 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 897 JVMWrapper("JVM_FindLoadedClass"); 898 ResourceMark rm(THREAD); 899 900 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 901 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 902 903 const char* str = java_lang_String::as_utf8_string(string()); 904 // Sanity check, don't expect null 905 if (str == NULL) return NULL; 906 907 const int str_len = (int)strlen(str); 908 if (str_len > Symbol::max_length()) { 909 // It's impossible to create this class; the name cannot fit 910 // into the constant pool. 911 return NULL; 912 } 913 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 914 915 // Security Note: 916 // The Java level wrapper will perform the necessary security check allowing 917 // us to pass the NULL as the initiating class loader. 918 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 919 if (UsePerfData) { 920 is_lock_held_by_thread(h_loader, 921 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 922 THREAD); 923 } 924 925 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 926 h_loader, 927 Handle(), 928 CHECK_NULL); 929 #if INCLUDE_CDS 930 if (k == NULL) { 931 // If the class is not already loaded, try to see if it's in the shared 932 // archive for the current classloader (h_loader). 933 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class( 934 klass_name, h_loader, CHECK_NULL); 935 k = ik(); 936 } 937 #endif 938 return (k == NULL) ? NULL : 939 (jclass) JNIHandles::make_local(env, k->java_mirror()); 940 JVM_END 941 942 943 // Reflection support ////////////////////////////////////////////////////////////////////////////// 944 945 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 946 assert (cls != NULL, "illegal class"); 947 JVMWrapper("JVM_GetClassName"); 948 JvmtiVMObjectAllocEventCollector oam; 949 ResourceMark rm(THREAD); 950 const char* name; 951 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 952 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 953 } else { 954 // Consider caching interned string in Klass 955 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 956 assert(k->is_klass(), "just checking"); 957 name = k->external_name(); 958 } 959 oop result = StringTable::intern((char*) name, CHECK_NULL); 960 return (jstring) JNIHandles::make_local(env, result); 961 JVM_END 962 963 964 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 965 JVMWrapper("JVM_GetClassInterfaces"); 966 JvmtiVMObjectAllocEventCollector oam; 967 oop mirror = JNIHandles::resolve_non_null(cls); 968 969 // Special handling for primitive objects 970 if (java_lang_Class::is_primitive(mirror)) { 971 // Primitive objects does not have any interfaces 972 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 973 return (jobjectArray) JNIHandles::make_local(env, r); 974 } 975 976 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror)); 977 // Figure size of result array 978 int size; 979 if (klass->oop_is_instance()) { 980 size = InstanceKlass::cast(klass())->local_interfaces()->length(); 981 } else { 982 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass"); 983 size = 2; 984 } 985 986 // Allocate result array 987 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 988 objArrayHandle result (THREAD, r); 989 // Fill in result 990 if (klass->oop_is_instance()) { 991 // Regular instance klass, fill in all local interfaces 992 for (int index = 0; index < size; index++) { 993 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index); 994 result->obj_at_put(index, k->java_mirror()); 995 } 996 } else { 997 // All arrays implement java.lang.Cloneable and java.io.Serializable 998 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 999 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1000 } 1001 return (jobjectArray) JNIHandles::make_local(env, result()); 1002 JVM_END 1003 1004 1005 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1006 JVMWrapper("JVM_IsInterface"); 1007 oop mirror = JNIHandles::resolve_non_null(cls); 1008 if (java_lang_Class::is_primitive(mirror)) { 1009 return JNI_FALSE; 1010 } 1011 Klass* k = java_lang_Class::as_Klass(mirror); 1012 jboolean result = k->is_interface(); 1013 assert(!result || k->oop_is_instance(), 1014 "all interfaces are instance types"); 1015 // The compiler intrinsic for isInterface tests the 1016 // Klass::_access_flags bits in the same way. 1017 return result; 1018 JVM_END 1019 1020 1021 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1022 JVMWrapper("JVM_GetClassSigners"); 1023 JvmtiVMObjectAllocEventCollector oam; 1024 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1025 // There are no signers for primitive types 1026 return NULL; 1027 } 1028 1029 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1030 1031 // If there are no signers set in the class, or if the class 1032 // is an array, return NULL. 1033 if (signers == NULL) return NULL; 1034 1035 // copy of the signers array 1036 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1037 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1038 for (int index = 0; index < signers->length(); index++) { 1039 signers_copy->obj_at_put(index, signers->obj_at(index)); 1040 } 1041 1042 // return the copy 1043 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1044 JVM_END 1045 1046 1047 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1048 JVMWrapper("JVM_SetClassSigners"); 1049 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1050 // This call is ignored for primitive types and arrays. 1051 // Signers are only set once, ClassLoader.java, and thus shouldn't 1052 // be called with an array. Only the bootstrap loader creates arrays. 1053 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1054 if (k->oop_is_instance()) { 1055 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1056 } 1057 } 1058 JVM_END 1059 1060 1061 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1062 JVMWrapper("JVM_GetProtectionDomain"); 1063 if (JNIHandles::resolve(cls) == NULL) { 1064 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1065 } 1066 1067 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1068 // Primitive types does not have a protection domain. 1069 return NULL; 1070 } 1071 1072 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1073 return (jobject) JNIHandles::make_local(env, pd); 1074 JVM_END 1075 1076 1077 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) { 1078 // If there is a security manager and protection domain, check the access 1079 // in the protection domain, otherwise it is authorized. 1080 if (java_lang_System::has_security_manager()) { 1081 1082 // For bootstrapping, if pd implies method isn't in the JDK, allow 1083 // this context to revert to older behavior. 1084 // In this case the isAuthorized field in AccessControlContext is also not 1085 // present. 1086 if (Universe::protection_domain_implies_method() == NULL) { 1087 return true; 1088 } 1089 1090 // Whitelist certain access control contexts 1091 if (java_security_AccessControlContext::is_authorized(context)) { 1092 return true; 1093 } 1094 1095 oop prot = klass->protection_domain(); 1096 if (prot != NULL) { 1097 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1098 // in the new wrapper. 1099 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1100 Handle h_prot(THREAD, prot); 1101 JavaValue result(T_BOOLEAN); 1102 JavaCallArguments args(h_prot); 1103 JavaCalls::call(&result, m, &args, CHECK_false); 1104 return (result.get_jboolean() != 0); 1105 } 1106 } 1107 return true; 1108 } 1109 1110 // Create an AccessControlContext with a protection domain with null codesource 1111 // and null permissions - which gives no permissions. 1112 oop create_dummy_access_control_context(TRAPS) { 1113 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass()); 1114 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1115 // Call constructor ProtectionDomain(null, null); 1116 JavaValue result(T_VOID); 1117 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass), 1118 vmSymbols::object_initializer_name(), 1119 vmSymbols::codesource_permissioncollection_signature(), 1120 Handle(), Handle(), CHECK_NULL); 1121 1122 // new ProtectionDomain[] {pd}; 1123 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1124 context->obj_at_put(0, obj()); 1125 1126 // new AccessControlContext(new ProtectionDomain[] {pd}) 1127 objArrayHandle h_context(THREAD, context); 1128 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1129 return acc; 1130 } 1131 1132 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1133 JVMWrapper("JVM_DoPrivileged"); 1134 1135 if (action == NULL) { 1136 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1137 } 1138 1139 // Compute the frame initiating the do privileged operation and setup the privileged stack 1140 vframeStream vfst(thread); 1141 vfst.security_get_caller_frame(1); 1142 1143 if (vfst.at_end()) { 1144 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1145 } 1146 1147 Method* method = vfst.method(); 1148 instanceKlassHandle klass (THREAD, method->method_holder()); 1149 1150 // Check that action object understands "Object run()" 1151 Handle h_context; 1152 if (context != NULL) { 1153 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1154 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1155 if (!authorized) { 1156 // Create an unprivileged access control object and call it's run function 1157 // instead. 1158 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1159 h_context = Handle(THREAD, noprivs); 1160 } 1161 } 1162 1163 // Check that action object understands "Object run()" 1164 Handle object (THREAD, JNIHandles::resolve(action)); 1165 1166 // get run() method 1167 Method* m_oop = object->klass()->uncached_lookup_method( 1168 vmSymbols::run_method_name(), 1169 vmSymbols::void_object_signature(), 1170 Klass::normal); 1171 methodHandle m (THREAD, m_oop); 1172 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { 1173 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1174 } 1175 1176 // Stack allocated list of privileged stack elements 1177 PrivilegedElement pi; 1178 if (!vfst.at_end()) { 1179 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1180 thread->set_privileged_stack_top(&pi); 1181 } 1182 1183 1184 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1185 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1186 Handle pending_exception; 1187 JavaValue result(T_OBJECT); 1188 JavaCallArguments args(object); 1189 JavaCalls::call(&result, m, &args, THREAD); 1190 1191 // done with action, remove ourselves from the list 1192 if (!vfst.at_end()) { 1193 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1194 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1195 } 1196 1197 if (HAS_PENDING_EXCEPTION) { 1198 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1199 CLEAR_PENDING_EXCEPTION; 1200 // JVMTI has already reported the pending exception 1201 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1202 if (THREAD->is_Java_thread()) { 1203 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1204 } 1205 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1206 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1207 // Throw a java.security.PrivilegedActionException(Exception e) exception 1208 JavaCallArguments args(pending_exception); 1209 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1210 vmSymbols::exception_void_signature(), 1211 &args); 1212 } 1213 } 1214 1215 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1216 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1217 JVM_END 1218 1219 1220 // Returns the inherited_access_control_context field of the running thread. 1221 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1222 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1223 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1224 return JNIHandles::make_local(env, result); 1225 JVM_END 1226 1227 class RegisterArrayForGC { 1228 private: 1229 JavaThread *_thread; 1230 public: 1231 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1232 _thread = thread; 1233 _thread->register_array_for_gc(array); 1234 } 1235 1236 ~RegisterArrayForGC() { 1237 _thread->register_array_for_gc(NULL); 1238 } 1239 }; 1240 1241 1242 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1243 JVMWrapper("JVM_GetStackAccessControlContext"); 1244 if (!UsePrivilegedStack) return NULL; 1245 1246 ResourceMark rm(THREAD); 1247 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1248 JvmtiVMObjectAllocEventCollector oam; 1249 1250 // count the protection domains on the execution stack. We collapse 1251 // duplicate consecutive protection domains into a single one, as 1252 // well as stopping when we hit a privileged frame. 1253 1254 // Use vframeStream to iterate through Java frames 1255 vframeStream vfst(thread); 1256 1257 oop previous_protection_domain = NULL; 1258 Handle privileged_context(thread, NULL); 1259 bool is_privileged = false; 1260 oop protection_domain = NULL; 1261 1262 for(; !vfst.at_end(); vfst.next()) { 1263 // get method of frame 1264 Method* method = vfst.method(); 1265 intptr_t* frame_id = vfst.frame_id(); 1266 1267 // check the privileged frames to see if we have a match 1268 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1269 // this frame is privileged 1270 is_privileged = true; 1271 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1272 protection_domain = thread->privileged_stack_top()->protection_domain(); 1273 } else { 1274 protection_domain = method->method_holder()->protection_domain(); 1275 } 1276 1277 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1278 local_array->push(protection_domain); 1279 previous_protection_domain = protection_domain; 1280 } 1281 1282 if (is_privileged) break; 1283 } 1284 1285 1286 // either all the domains on the stack were system domains, or 1287 // we had a privileged system domain 1288 if (local_array->is_empty()) { 1289 if (is_privileged && privileged_context.is_null()) return NULL; 1290 1291 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1292 return JNIHandles::make_local(env, result); 1293 } 1294 1295 // the resource area must be registered in case of a gc 1296 RegisterArrayForGC ragc(thread, local_array); 1297 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1298 local_array->length(), CHECK_NULL); 1299 objArrayHandle h_context(thread, context); 1300 for (int index = 0; index < local_array->length(); index++) { 1301 h_context->obj_at_put(index, local_array->at(index)); 1302 } 1303 1304 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1305 1306 return JNIHandles::make_local(env, result); 1307 JVM_END 1308 1309 1310 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1311 JVMWrapper("JVM_IsArrayClass"); 1312 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1313 return (k != NULL) && k->oop_is_array() ? true : false; 1314 JVM_END 1315 1316 1317 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1318 JVMWrapper("JVM_IsPrimitiveClass"); 1319 oop mirror = JNIHandles::resolve_non_null(cls); 1320 return (jboolean) java_lang_Class::is_primitive(mirror); 1321 JVM_END 1322 1323 1324 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1325 JVMWrapper("JVM_GetClassModifiers"); 1326 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1327 // Primitive type 1328 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1329 } 1330 1331 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1332 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1333 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1334 return k->modifier_flags(); 1335 JVM_END 1336 1337 1338 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1339 1340 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1341 JvmtiVMObjectAllocEventCollector oam; 1342 // ofClass is a reference to a java_lang_Class object. The mirror object 1343 // of an InstanceKlass 1344 1345 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1346 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1347 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1348 return (jobjectArray)JNIHandles::make_local(env, result); 1349 } 1350 1351 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1352 InnerClassesIterator iter(k); 1353 1354 if (iter.length() == 0) { 1355 // Neither an inner nor outer class 1356 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1357 return (jobjectArray)JNIHandles::make_local(env, result); 1358 } 1359 1360 // find inner class info 1361 constantPoolHandle cp(thread, k->constants()); 1362 int length = iter.length(); 1363 1364 // Allocate temp. result array 1365 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1366 objArrayHandle result (THREAD, r); 1367 int members = 0; 1368 1369 for (; !iter.done(); iter.next()) { 1370 int ioff = iter.inner_class_info_index(); 1371 int ooff = iter.outer_class_info_index(); 1372 1373 if (ioff != 0 && ooff != 0) { 1374 // Check to see if the name matches the class we're looking for 1375 // before attempting to find the class. 1376 if (cp->klass_name_at_matches(k, ooff)) { 1377 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1378 if (outer_klass == k()) { 1379 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1380 instanceKlassHandle inner_klass (THREAD, ik); 1381 1382 // Throws an exception if outer klass has not declared k as 1383 // an inner klass 1384 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1385 1386 result->obj_at_put(members, inner_klass->java_mirror()); 1387 members++; 1388 } 1389 } 1390 } 1391 } 1392 1393 if (members != length) { 1394 // Return array of right length 1395 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1396 for(int i = 0; i < members; i++) { 1397 res->obj_at_put(i, result->obj_at(i)); 1398 } 1399 return (jobjectArray)JNIHandles::make_local(env, res); 1400 } 1401 1402 return (jobjectArray)JNIHandles::make_local(env, result()); 1403 JVM_END 1404 1405 1406 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1407 { 1408 // ofClass is a reference to a java_lang_Class object. 1409 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1410 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1411 return NULL; 1412 } 1413 1414 bool inner_is_member = false; 1415 Klass* outer_klass 1416 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1417 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1418 if (outer_klass == NULL) return NULL; // already a top-level class 1419 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1420 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1421 } 1422 JVM_END 1423 1424 // should be in InstanceKlass.cpp, but is here for historical reasons 1425 Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle k, 1426 bool* inner_is_member, 1427 TRAPS) { 1428 Thread* thread = THREAD; 1429 InnerClassesIterator iter(k); 1430 if (iter.length() == 0) { 1431 // No inner class info => no declaring class 1432 return NULL; 1433 } 1434 1435 constantPoolHandle i_cp(thread, k->constants()); 1436 1437 bool found = false; 1438 Klass* ok; 1439 instanceKlassHandle outer_klass; 1440 *inner_is_member = false; 1441 1442 // Find inner_klass attribute 1443 for (; !iter.done() && !found; iter.next()) { 1444 int ioff = iter.inner_class_info_index(); 1445 int ooff = iter.outer_class_info_index(); 1446 int noff = iter.inner_name_index(); 1447 if (ioff != 0) { 1448 // Check to see if the name matches the class we're looking for 1449 // before attempting to find the class. 1450 if (i_cp->klass_name_at_matches(k, ioff)) { 1451 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_NULL); 1452 found = (k() == inner_klass); 1453 if (found && ooff != 0) { 1454 ok = i_cp->klass_at(ooff, CHECK_NULL); 1455 outer_klass = instanceKlassHandle(thread, ok); 1456 *inner_is_member = true; 1457 } 1458 } 1459 } 1460 } 1461 1462 if (found && outer_klass.is_null()) { 1463 // It may be anonymous; try for that. 1464 int encl_method_class_idx = k->enclosing_method_class_index(); 1465 if (encl_method_class_idx != 0) { 1466 ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL); 1467 outer_klass = instanceKlassHandle(thread, ok); 1468 *inner_is_member = false; 1469 } 1470 } 1471 1472 // If no inner class attribute found for this class. 1473 if (outer_klass.is_null()) return NULL; 1474 1475 // Throws an exception if outer klass has not declared k as an inner klass 1476 // We need evidence that each klass knows about the other, or else 1477 // the system could allow a spoof of an inner class to gain access rights. 1478 Reflection::check_for_inner_class(outer_klass, k, *inner_is_member, CHECK_NULL); 1479 return outer_klass(); 1480 } 1481 1482 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1483 assert (cls != NULL, "illegal class"); 1484 JVMWrapper("JVM_GetClassSignature"); 1485 JvmtiVMObjectAllocEventCollector oam; 1486 ResourceMark rm(THREAD); 1487 // Return null for arrays and primatives 1488 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1489 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1490 if (k->oop_is_instance()) { 1491 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1492 if (sym == NULL) return NULL; 1493 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1494 return (jstring) JNIHandles::make_local(env, str()); 1495 } 1496 } 1497 return NULL; 1498 JVM_END 1499 1500 1501 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1502 assert (cls != NULL, "illegal class"); 1503 JVMWrapper("JVM_GetClassAnnotations"); 1504 1505 // Return null for arrays and primitives 1506 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1507 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1508 if (k->oop_is_instance()) { 1509 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1510 return (jbyteArray) JNIHandles::make_local(env, a); 1511 } 1512 } 1513 return NULL; 1514 JVM_END 1515 1516 1517 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1518 // some of this code was adapted from from jni_FromReflectedField 1519 1520 oop reflected = JNIHandles::resolve_non_null(field); 1521 oop mirror = java_lang_reflect_Field::clazz(reflected); 1522 Klass* k = java_lang_Class::as_Klass(mirror); 1523 int slot = java_lang_reflect_Field::slot(reflected); 1524 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1525 1526 KlassHandle kh(THREAD, k); 1527 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot); 1528 1529 if (modifiers & JVM_ACC_STATIC) { 1530 // for static fields we only look in the current class 1531 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) { 1532 assert(false, "cannot find static field"); 1533 return false; 1534 } 1535 } else { 1536 // for instance fields we start with the current class and work 1537 // our way up through the superclass chain 1538 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) { 1539 assert(false, "cannot find instance field"); 1540 return false; 1541 } 1542 } 1543 return true; 1544 } 1545 1546 static Method* jvm_get_method_common(jobject method) { 1547 // some of this code was adapted from from jni_FromReflectedMethod 1548 1549 oop reflected = JNIHandles::resolve_non_null(method); 1550 oop mirror = NULL; 1551 int slot = 0; 1552 1553 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1554 mirror = java_lang_reflect_Constructor::clazz(reflected); 1555 slot = java_lang_reflect_Constructor::slot(reflected); 1556 } else { 1557 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1558 "wrong type"); 1559 mirror = java_lang_reflect_Method::clazz(reflected); 1560 slot = java_lang_reflect_Method::slot(reflected); 1561 } 1562 Klass* k = java_lang_Class::as_Klass(mirror); 1563 1564 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1565 assert(m != NULL, "cannot find method"); 1566 return m; // caller has to deal with NULL in product mode 1567 } 1568 1569 /* Type use annotations support (JDK 1.8) */ 1570 1571 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1572 assert (cls != NULL, "illegal class"); 1573 JVMWrapper("JVM_GetClassTypeAnnotations"); 1574 ResourceMark rm(THREAD); 1575 // Return null for arrays and primitives 1576 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1577 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1578 if (k->oop_is_instance()) { 1579 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1580 if (type_annotations != NULL) { 1581 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1582 return (jbyteArray) JNIHandles::make_local(env, a); 1583 } 1584 } 1585 } 1586 return NULL; 1587 JVM_END 1588 1589 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1590 assert (method != NULL, "illegal method"); 1591 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1592 1593 // method is a handle to a java.lang.reflect.Method object 1594 Method* m = jvm_get_method_common(method); 1595 if (m == NULL) { 1596 return NULL; 1597 } 1598 1599 AnnotationArray* type_annotations = m->type_annotations(); 1600 if (type_annotations != NULL) { 1601 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1602 return (jbyteArray) JNIHandles::make_local(env, a); 1603 } 1604 1605 return NULL; 1606 JVM_END 1607 1608 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1609 assert (field != NULL, "illegal field"); 1610 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1611 1612 fieldDescriptor fd; 1613 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1614 if (!gotFd) { 1615 return NULL; 1616 } 1617 1618 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1619 JVM_END 1620 1621 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { 1622 if (!cp->is_within_bounds(index)) { 1623 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1624 } 1625 } 1626 1627 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1628 { 1629 JVMWrapper("JVM_GetMethodParameters"); 1630 // method is a handle to a java.lang.reflect.Method object 1631 Method* method_ptr = jvm_get_method_common(method); 1632 methodHandle mh (THREAD, method_ptr); 1633 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1634 const int num_params = mh->method_parameters_length(); 1635 1636 if (num_params < 0) { 1637 // A -1 return value from method_parameters_length means there is no 1638 // parameter data. Return null to indicate this to the reflection 1639 // API. 1640 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1641 return (jobjectArray)NULL; 1642 } else { 1643 // Otherwise, we return something up to reflection, even if it is 1644 // a zero-length array. Why? Because in some cases this can 1645 // trigger a MalformedParametersException. 1646 1647 // make sure all the symbols are properly formatted 1648 for (int i = 0; i < num_params; i++) { 1649 MethodParametersElement* params = mh->method_parameters_start(); 1650 int index = params[i].name_cp_index; 1651 bounds_check(mh->constants(), index, CHECK_NULL); 1652 1653 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1654 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1655 "Wrong type at constant pool index"); 1656 } 1657 1658 } 1659 1660 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1661 objArrayHandle result (THREAD, result_oop); 1662 1663 for (int i = 0; i < num_params; i++) { 1664 MethodParametersElement* params = mh->method_parameters_start(); 1665 // For a 0 index, give a NULL symbol 1666 Symbol* sym = 0 != params[i].name_cp_index ? 1667 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1668 int flags = params[i].flags; 1669 oop param = Reflection::new_parameter(reflected_method, i, sym, 1670 flags, CHECK_NULL); 1671 result->obj_at_put(i, param); 1672 } 1673 return (jobjectArray)JNIHandles::make_local(env, result()); 1674 } 1675 } 1676 JVM_END 1677 1678 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1679 1680 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1681 { 1682 JVMWrapper("JVM_GetClassDeclaredFields"); 1683 JvmtiVMObjectAllocEventCollector oam; 1684 1685 // Exclude primitive types and array types 1686 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1687 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 1688 // Return empty array 1689 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1690 return (jobjectArray) JNIHandles::make_local(env, res); 1691 } 1692 1693 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1694 constantPoolHandle cp(THREAD, k->constants()); 1695 1696 // Ensure class is linked 1697 k->link_class(CHECK_NULL); 1698 1699 // 4496456 We need to filter out java.lang.Throwable.backtrace 1700 bool skip_backtrace = false; 1701 1702 // Allocate result 1703 int num_fields; 1704 1705 if (publicOnly) { 1706 num_fields = 0; 1707 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) { 1708 if (fs.access_flags().is_public()) ++num_fields; 1709 } 1710 } else { 1711 num_fields = k->java_fields_count(); 1712 1713 if (k() == SystemDictionary::Throwable_klass()) { 1714 num_fields--; 1715 skip_backtrace = true; 1716 } 1717 } 1718 1719 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1720 objArrayHandle result (THREAD, r); 1721 1722 int out_idx = 0; 1723 fieldDescriptor fd; 1724 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1725 if (skip_backtrace) { 1726 // 4496456 skip java.lang.Throwable.backtrace 1727 int offset = fs.offset(); 1728 if (offset == java_lang_Throwable::get_backtrace_offset()) continue; 1729 } 1730 1731 if (!publicOnly || fs.access_flags().is_public()) { 1732 fd.reinitialize(k(), fs.index()); 1733 oop field = Reflection::new_field(&fd, CHECK_NULL); 1734 result->obj_at_put(out_idx, field); 1735 ++out_idx; 1736 } 1737 } 1738 assert(out_idx == num_fields, "just checking"); 1739 return (jobjectArray) JNIHandles::make_local(env, result()); 1740 } 1741 JVM_END 1742 1743 static bool select_method(methodHandle method, bool want_constructor) { 1744 if (want_constructor) { 1745 return (method->is_initializer() && !method->is_static()); 1746 } else { 1747 return (!method->is_initializer() && !method->is_overpass()); 1748 } 1749 } 1750 1751 static jobjectArray get_class_declared_methods_helper( 1752 JNIEnv *env, 1753 jclass ofClass, jboolean publicOnly, 1754 bool want_constructor, 1755 Klass* klass, TRAPS) { 1756 1757 JvmtiVMObjectAllocEventCollector oam; 1758 1759 // Exclude primitive types and array types 1760 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1761 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 1762 // Return empty array 1763 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1764 return (jobjectArray) JNIHandles::make_local(env, res); 1765 } 1766 1767 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1768 1769 // Ensure class is linked 1770 k->link_class(CHECK_NULL); 1771 1772 Array<Method*>* methods = k->methods(); 1773 int methods_length = methods->length(); 1774 1775 // Save original method_idnum in case of redefinition, which can change 1776 // the idnum of obsolete methods. The new method will have the same idnum 1777 // but if we refresh the methods array, the counts will be wrong. 1778 ResourceMark rm(THREAD); 1779 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1780 int num_methods = 0; 1781 1782 for (int i = 0; i < methods_length; i++) { 1783 methodHandle method(THREAD, methods->at(i)); 1784 if (select_method(method, want_constructor)) { 1785 if (!publicOnly || method->is_public()) { 1786 idnums->push(method->method_idnum()); 1787 ++num_methods; 1788 } 1789 } 1790 } 1791 1792 // Allocate result 1793 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1794 objArrayHandle result (THREAD, r); 1795 1796 // Now just put the methods that we selected above, but go by their idnum 1797 // in case of redefinition. The methods can be redefined at any safepoint, 1798 // so above when allocating the oop array and below when creating reflect 1799 // objects. 1800 for (int i = 0; i < num_methods; i++) { 1801 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1802 if (method.is_null()) { 1803 // Method may have been deleted and seems this API can handle null 1804 // Otherwise should probably put a method that throws NSME 1805 result->obj_at_put(i, NULL); 1806 } else { 1807 oop m; 1808 if (want_constructor) { 1809 m = Reflection::new_constructor(method, CHECK_NULL); 1810 } else { 1811 m = Reflection::new_method(method, false, CHECK_NULL); 1812 } 1813 result->obj_at_put(i, m); 1814 } 1815 } 1816 1817 return (jobjectArray) JNIHandles::make_local(env, result()); 1818 } 1819 1820 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1821 { 1822 JVMWrapper("JVM_GetClassDeclaredMethods"); 1823 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1824 /*want_constructor*/ false, 1825 SystemDictionary::reflect_Method_klass(), THREAD); 1826 } 1827 JVM_END 1828 1829 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1830 { 1831 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1832 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1833 /*want_constructor*/ true, 1834 SystemDictionary::reflect_Constructor_klass(), THREAD); 1835 } 1836 JVM_END 1837 1838 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1839 { 1840 JVMWrapper("JVM_GetClassAccessFlags"); 1841 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1842 // Primitive type 1843 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1844 } 1845 1846 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1847 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1848 } 1849 JVM_END 1850 1851 1852 // Constant pool access ////////////////////////////////////////////////////////// 1853 1854 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1855 { 1856 JVMWrapper("JVM_GetClassConstantPool"); 1857 JvmtiVMObjectAllocEventCollector oam; 1858 1859 // Return null for primitives and arrays 1860 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1861 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1862 if (k->oop_is_instance()) { 1863 instanceKlassHandle k_h(THREAD, k); 1864 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL); 1865 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1866 return JNIHandles::make_local(jcp()); 1867 } 1868 } 1869 return NULL; 1870 } 1871 JVM_END 1872 1873 1874 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1875 { 1876 JVMWrapper("JVM_ConstantPoolGetSize"); 1877 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1878 return cp->length(); 1879 } 1880 JVM_END 1881 1882 1883 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1884 { 1885 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1886 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1887 bounds_check(cp, index, CHECK_NULL); 1888 constantTag tag = cp->tag_at(index); 1889 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1890 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1891 } 1892 Klass* k = cp->klass_at(index, CHECK_NULL); 1893 return (jclass) JNIHandles::make_local(k->java_mirror()); 1894 } 1895 JVM_END 1896 1897 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1898 { 1899 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1900 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1901 bounds_check(cp, index, CHECK_NULL); 1902 constantTag tag = cp->tag_at(index); 1903 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1904 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1905 } 1906 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1907 if (k == NULL) return NULL; 1908 return (jclass) JNIHandles::make_local(k->java_mirror()); 1909 } 1910 JVM_END 1911 1912 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1913 constantTag tag = cp->tag_at(index); 1914 if (!tag.is_method() && !tag.is_interface_method()) { 1915 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1916 } 1917 int klass_ref = cp->uncached_klass_ref_index_at(index); 1918 Klass* k_o; 1919 if (force_resolution) { 1920 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1921 } else { 1922 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1923 if (k_o == NULL) return NULL; 1924 } 1925 instanceKlassHandle k(THREAD, k_o); 1926 Symbol* name = cp->uncached_name_ref_at(index); 1927 Symbol* sig = cp->uncached_signature_ref_at(index); 1928 methodHandle m (THREAD, k->find_method(name, sig)); 1929 if (m.is_null()) { 1930 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1931 } 1932 oop method; 1933 if (!m->is_initializer() || m->is_static()) { 1934 method = Reflection::new_method(m, true, CHECK_NULL); 1935 } else { 1936 method = Reflection::new_constructor(m, CHECK_NULL); 1937 } 1938 return JNIHandles::make_local(method); 1939 } 1940 1941 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1942 { 1943 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1944 JvmtiVMObjectAllocEventCollector oam; 1945 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1946 bounds_check(cp, index, CHECK_NULL); 1947 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1948 return res; 1949 } 1950 JVM_END 1951 1952 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1953 { 1954 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 1955 JvmtiVMObjectAllocEventCollector oam; 1956 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1957 bounds_check(cp, index, CHECK_NULL); 1958 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 1959 return res; 1960 } 1961 JVM_END 1962 1963 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1964 constantTag tag = cp->tag_at(index); 1965 if (!tag.is_field()) { 1966 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1967 } 1968 int klass_ref = cp->uncached_klass_ref_index_at(index); 1969 Klass* k_o; 1970 if (force_resolution) { 1971 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1972 } else { 1973 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1974 if (k_o == NULL) return NULL; 1975 } 1976 instanceKlassHandle k(THREAD, k_o); 1977 Symbol* name = cp->uncached_name_ref_at(index); 1978 Symbol* sig = cp->uncached_signature_ref_at(index); 1979 fieldDescriptor fd; 1980 Klass* target_klass = k->find_field(name, sig, &fd); 1981 if (target_klass == NULL) { 1982 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 1983 } 1984 oop field = Reflection::new_field(&fd, CHECK_NULL); 1985 return JNIHandles::make_local(field); 1986 } 1987 1988 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 1989 { 1990 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 1991 JvmtiVMObjectAllocEventCollector oam; 1992 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1993 bounds_check(cp, index, CHECK_NULL); 1994 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 1995 return res; 1996 } 1997 JVM_END 1998 1999 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2000 { 2001 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2002 JvmtiVMObjectAllocEventCollector oam; 2003 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2004 bounds_check(cp, index, CHECK_NULL); 2005 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2006 return res; 2007 } 2008 JVM_END 2009 2010 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2011 { 2012 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2013 JvmtiVMObjectAllocEventCollector oam; 2014 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2015 bounds_check(cp, index, CHECK_NULL); 2016 constantTag tag = cp->tag_at(index); 2017 if (!tag.is_field_or_method()) { 2018 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2019 } 2020 int klass_ref = cp->uncached_klass_ref_index_at(index); 2021 Symbol* klass_name = cp->klass_name_at(klass_ref); 2022 Symbol* member_name = cp->uncached_name_ref_at(index); 2023 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2024 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2025 objArrayHandle dest(THREAD, dest_o); 2026 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2027 dest->obj_at_put(0, str()); 2028 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2029 dest->obj_at_put(1, str()); 2030 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2031 dest->obj_at_put(2, str()); 2032 return (jobjectArray) JNIHandles::make_local(dest()); 2033 } 2034 JVM_END 2035 2036 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2037 { 2038 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2039 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2040 bounds_check(cp, index, CHECK_0); 2041 constantTag tag = cp->tag_at(index); 2042 if (!tag.is_int()) { 2043 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2044 } 2045 return cp->int_at(index); 2046 } 2047 JVM_END 2048 2049 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2050 { 2051 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2052 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2053 bounds_check(cp, index, CHECK_(0L)); 2054 constantTag tag = cp->tag_at(index); 2055 if (!tag.is_long()) { 2056 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2057 } 2058 return cp->long_at(index); 2059 } 2060 JVM_END 2061 2062 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2063 { 2064 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2065 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2066 bounds_check(cp, index, CHECK_(0.0f)); 2067 constantTag tag = cp->tag_at(index); 2068 if (!tag.is_float()) { 2069 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2070 } 2071 return cp->float_at(index); 2072 } 2073 JVM_END 2074 2075 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2076 { 2077 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2078 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2079 bounds_check(cp, index, CHECK_(0.0)); 2080 constantTag tag = cp->tag_at(index); 2081 if (!tag.is_double()) { 2082 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2083 } 2084 return cp->double_at(index); 2085 } 2086 JVM_END 2087 2088 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2089 { 2090 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2091 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2092 bounds_check(cp, index, CHECK_NULL); 2093 constantTag tag = cp->tag_at(index); 2094 if (!tag.is_string()) { 2095 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2096 } 2097 oop str = cp->string_at(index, CHECK_NULL); 2098 return (jstring) JNIHandles::make_local(str); 2099 } 2100 JVM_END 2101 2102 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2103 { 2104 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2105 JvmtiVMObjectAllocEventCollector oam; 2106 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2107 bounds_check(cp, index, CHECK_NULL); 2108 constantTag tag = cp->tag_at(index); 2109 if (!tag.is_symbol()) { 2110 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2111 } 2112 Symbol* sym = cp->symbol_at(index); 2113 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2114 return (jstring) JNIHandles::make_local(str()); 2115 } 2116 JVM_END 2117 2118 2119 // Assertion support. ////////////////////////////////////////////////////////// 2120 2121 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2122 JVMWrapper("JVM_DesiredAssertionStatus"); 2123 assert(cls != NULL, "bad class"); 2124 2125 oop r = JNIHandles::resolve(cls); 2126 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2127 if (java_lang_Class::is_primitive(r)) return false; 2128 2129 Klass* k = java_lang_Class::as_Klass(r); 2130 assert(k->oop_is_instance(), "must be an instance klass"); 2131 if (! k->oop_is_instance()) return false; 2132 2133 ResourceMark rm(THREAD); 2134 const char* name = k->name()->as_C_string(); 2135 bool system_class = k->class_loader() == NULL; 2136 return JavaAssertions::enabled(name, system_class); 2137 2138 JVM_END 2139 2140 2141 // Return a new AssertionStatusDirectives object with the fields filled in with 2142 // command-line assertion arguments (i.e., -ea, -da). 2143 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2144 JVMWrapper("JVM_AssertionStatusDirectives"); 2145 JvmtiVMObjectAllocEventCollector oam; 2146 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2147 return JNIHandles::make_local(env, asd); 2148 JVM_END 2149 2150 // Verification //////////////////////////////////////////////////////////////////////////////// 2151 2152 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2153 2154 // RedefineClasses support: bug 6214132 caused verification to fail. 2155 // All functions from this section should call the jvmtiThreadSate function: 2156 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2157 // The function returns a Klass* of the _scratch_class if the verifier 2158 // was invoked in the middle of the class redefinition. 2159 // Otherwise it returns its argument value which is the _the_class Klass*. 2160 // Please, refer to the description in the jvmtiThreadSate.hpp. 2161 2162 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2163 JVMWrapper("JVM_GetClassNameUTF"); 2164 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2165 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2166 return k->name()->as_utf8(); 2167 JVM_END 2168 2169 2170 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2171 JVMWrapper("JVM_GetClassCPTypes"); 2172 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2173 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2174 // types will have length zero if this is not an InstanceKlass 2175 // (length is determined by call to JVM_GetClassCPEntriesCount) 2176 if (k->oop_is_instance()) { 2177 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2178 for (int index = cp->length() - 1; index >= 0; index--) { 2179 constantTag tag = cp->tag_at(index); 2180 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2181 } 2182 } 2183 JVM_END 2184 2185 2186 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2187 JVMWrapper("JVM_GetClassCPEntriesCount"); 2188 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2189 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2190 if (!k->oop_is_instance()) 2191 return 0; 2192 return InstanceKlass::cast(k)->constants()->length(); 2193 JVM_END 2194 2195 2196 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2197 JVMWrapper("JVM_GetClassFieldsCount"); 2198 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2199 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2200 if (!k->oop_is_instance()) 2201 return 0; 2202 return InstanceKlass::cast(k)->java_fields_count(); 2203 JVM_END 2204 2205 2206 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2207 JVMWrapper("JVM_GetClassMethodsCount"); 2208 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2209 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2210 if (!k->oop_is_instance()) 2211 return 0; 2212 return InstanceKlass::cast(k)->methods()->length(); 2213 JVM_END 2214 2215 2216 // The following methods, used for the verifier, are never called with 2217 // array klasses, so a direct cast to InstanceKlass is safe. 2218 // Typically, these methods are called in a loop with bounds determined 2219 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2220 // zero for arrays. 2221 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2222 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2223 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2224 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2225 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2226 int length = method->checked_exceptions_length(); 2227 if (length > 0) { 2228 CheckedExceptionElement* table= method->checked_exceptions_start(); 2229 for (int i = 0; i < length; i++) { 2230 exceptions[i] = table[i].class_cp_index; 2231 } 2232 } 2233 JVM_END 2234 2235 2236 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2237 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2238 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2239 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2240 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2241 return method->checked_exceptions_length(); 2242 JVM_END 2243 2244 2245 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2246 JVMWrapper("JVM_GetMethodIxByteCode"); 2247 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2248 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2249 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2250 memcpy(code, method->code_base(), method->code_size()); 2251 JVM_END 2252 2253 2254 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2255 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2256 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2257 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2258 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2259 return method->code_size(); 2260 JVM_END 2261 2262 2263 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2264 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2265 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2266 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2267 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2268 ExceptionTable extable(method); 2269 entry->start_pc = extable.start_pc(entry_index); 2270 entry->end_pc = extable.end_pc(entry_index); 2271 entry->handler_pc = extable.handler_pc(entry_index); 2272 entry->catchType = extable.catch_type_index(entry_index); 2273 JVM_END 2274 2275 2276 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2277 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2278 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2279 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2280 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2281 return method->exception_table_length(); 2282 JVM_END 2283 2284 2285 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2286 JVMWrapper("JVM_GetMethodIxModifiers"); 2287 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2288 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2289 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2290 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2291 JVM_END 2292 2293 2294 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2295 JVMWrapper("JVM_GetFieldIxModifiers"); 2296 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2297 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2298 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2299 JVM_END 2300 2301 2302 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2303 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2304 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2305 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2306 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2307 return method->max_locals(); 2308 JVM_END 2309 2310 2311 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2312 JVMWrapper("JVM_GetMethodIxArgsSize"); 2313 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2314 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2315 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2316 return method->size_of_parameters(); 2317 JVM_END 2318 2319 2320 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2321 JVMWrapper("JVM_GetMethodIxMaxStack"); 2322 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2323 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2324 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2325 return method->verifier_max_stack(); 2326 JVM_END 2327 2328 2329 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2330 JVMWrapper("JVM_IsConstructorIx"); 2331 ResourceMark rm(THREAD); 2332 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2333 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2334 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2335 return method->name() == vmSymbols::object_initializer_name(); 2336 JVM_END 2337 2338 2339 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2340 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2341 ResourceMark rm(THREAD); 2342 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2343 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2344 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2345 return method->is_overpass(); 2346 JVM_END 2347 2348 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2349 JVMWrapper("JVM_GetMethodIxIxUTF"); 2350 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2351 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2352 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2353 return method->name()->as_utf8(); 2354 JVM_END 2355 2356 2357 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2358 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2359 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2360 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2361 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2362 return method->signature()->as_utf8(); 2363 JVM_END 2364 2365 /** 2366 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2367 * read entries in the constant pool. Since the old verifier always 2368 * works on a copy of the code, it will not see any rewriting that 2369 * may possibly occur in the middle of verification. So it is important 2370 * that nothing it calls tries to use the cpCache instead of the raw 2371 * constant pool, so we must use cp->uncached_x methods when appropriate. 2372 */ 2373 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2374 JVMWrapper("JVM_GetCPFieldNameUTF"); 2375 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2376 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2377 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2378 switch (cp->tag_at(cp_index).value()) { 2379 case JVM_CONSTANT_Fieldref: 2380 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2381 default: 2382 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2383 } 2384 ShouldNotReachHere(); 2385 return NULL; 2386 JVM_END 2387 2388 2389 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2390 JVMWrapper("JVM_GetCPMethodNameUTF"); 2391 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2392 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2393 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2394 switch (cp->tag_at(cp_index).value()) { 2395 case JVM_CONSTANT_InterfaceMethodref: 2396 case JVM_CONSTANT_Methodref: 2397 case JVM_CONSTANT_NameAndType: // for invokedynamic 2398 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2399 default: 2400 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2401 } 2402 ShouldNotReachHere(); 2403 return NULL; 2404 JVM_END 2405 2406 2407 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2408 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2409 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2410 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2411 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2412 switch (cp->tag_at(cp_index).value()) { 2413 case JVM_CONSTANT_InterfaceMethodref: 2414 case JVM_CONSTANT_Methodref: 2415 case JVM_CONSTANT_NameAndType: // for invokedynamic 2416 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2417 default: 2418 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2419 } 2420 ShouldNotReachHere(); 2421 return NULL; 2422 JVM_END 2423 2424 2425 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2426 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2427 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2428 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2429 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2430 switch (cp->tag_at(cp_index).value()) { 2431 case JVM_CONSTANT_Fieldref: 2432 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2433 default: 2434 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2435 } 2436 ShouldNotReachHere(); 2437 return NULL; 2438 JVM_END 2439 2440 2441 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2442 JVMWrapper("JVM_GetCPClassNameUTF"); 2443 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2444 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2445 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2446 Symbol* classname = cp->klass_name_at(cp_index); 2447 return classname->as_utf8(); 2448 JVM_END 2449 2450 2451 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2452 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2453 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2454 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2455 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2456 switch (cp->tag_at(cp_index).value()) { 2457 case JVM_CONSTANT_Fieldref: { 2458 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2459 Symbol* classname = cp->klass_name_at(class_index); 2460 return classname->as_utf8(); 2461 } 2462 default: 2463 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2464 } 2465 ShouldNotReachHere(); 2466 return NULL; 2467 JVM_END 2468 2469 2470 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2471 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2472 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2473 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2474 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2475 switch (cp->tag_at(cp_index).value()) { 2476 case JVM_CONSTANT_Methodref: 2477 case JVM_CONSTANT_InterfaceMethodref: { 2478 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2479 Symbol* classname = cp->klass_name_at(class_index); 2480 return classname->as_utf8(); 2481 } 2482 default: 2483 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2484 } 2485 ShouldNotReachHere(); 2486 return NULL; 2487 JVM_END 2488 2489 2490 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2491 JVMWrapper("JVM_GetCPFieldModifiers"); 2492 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2493 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2494 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2495 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2496 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2497 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2498 switch (cp->tag_at(cp_index).value()) { 2499 case JVM_CONSTANT_Fieldref: { 2500 Symbol* name = cp->uncached_name_ref_at(cp_index); 2501 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2502 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) { 2503 if (fs.name() == name && fs.signature() == signature) { 2504 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2505 } 2506 } 2507 return -1; 2508 } 2509 default: 2510 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2511 } 2512 ShouldNotReachHere(); 2513 return 0; 2514 JVM_END 2515 2516 2517 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2518 JVMWrapper("JVM_GetCPMethodModifiers"); 2519 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2520 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2521 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2522 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2523 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2524 switch (cp->tag_at(cp_index).value()) { 2525 case JVM_CONSTANT_Methodref: 2526 case JVM_CONSTANT_InterfaceMethodref: { 2527 Symbol* name = cp->uncached_name_ref_at(cp_index); 2528 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2529 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2530 int methods_count = methods->length(); 2531 for (int i = 0; i < methods_count; i++) { 2532 Method* method = methods->at(i); 2533 if (method->name() == name && method->signature() == signature) { 2534 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2535 } 2536 } 2537 return -1; 2538 } 2539 default: 2540 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2541 } 2542 ShouldNotReachHere(); 2543 return 0; 2544 JVM_END 2545 2546 2547 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2548 2549 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2550 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2551 JVM_END 2552 2553 2554 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2555 JVMWrapper("JVM_IsSameClassPackage"); 2556 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2557 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2558 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2559 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2560 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2561 JVM_END 2562 2563 // Printing support ////////////////////////////////////////////////// 2564 extern "C" { 2565 2566 ATTRIBUTE_PRINTF(3, 0) 2567 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2568 // see bug 4399518, 4417214 2569 if ((intptr_t)count <= 0) return -1; 2570 2571 int result = vsnprintf(str, count, fmt, args); 2572 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2573 // characters which would have been written had the buffer been large 2574 // enough; on Windows, it returns -1. We handle both cases here and 2575 // always return -1, and perform null termination. 2576 if ((result > 0 && (size_t)result >= count) || result == -1) { 2577 str[count - 1] = '\0'; 2578 result = -1; 2579 } 2580 2581 return result; 2582 } 2583 2584 ATTRIBUTE_PRINTF(3, 0) 2585 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2586 va_list args; 2587 int len; 2588 va_start(args, fmt); 2589 len = jio_vsnprintf(str, count, fmt, args); 2590 va_end(args); 2591 return len; 2592 } 2593 2594 ATTRIBUTE_PRINTF(2,3) 2595 int jio_fprintf(FILE* f, const char *fmt, ...) { 2596 int len; 2597 va_list args; 2598 va_start(args, fmt); 2599 len = jio_vfprintf(f, fmt, args); 2600 va_end(args); 2601 return len; 2602 } 2603 2604 ATTRIBUTE_PRINTF(2, 0) 2605 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2606 if (Arguments::vfprintf_hook() != NULL) { 2607 return Arguments::vfprintf_hook()(f, fmt, args); 2608 } else { 2609 return vfprintf(f, fmt, args); 2610 } 2611 } 2612 2613 ATTRIBUTE_PRINTF(1, 2) 2614 JNIEXPORT int jio_printf(const char *fmt, ...) { 2615 int len; 2616 va_list args; 2617 va_start(args, fmt); 2618 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2619 va_end(args); 2620 return len; 2621 } 2622 2623 2624 // HotSpot specific jio method 2625 void jio_print(const char* s) { 2626 // Try to make this function as atomic as possible. 2627 if (Arguments::vfprintf_hook() != NULL) { 2628 jio_fprintf(defaultStream::output_stream(), "%s", s); 2629 } else { 2630 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2631 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2632 } 2633 } 2634 2635 } // Extern C 2636 2637 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2638 2639 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 2640 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or 2641 // OSThread objects. The exception to this rule is when the target object is the thread 2642 // doing the operation, in which case we know that the thread won't exit until the 2643 // operation is done (all exits being voluntary). There are a few cases where it is 2644 // rather silly to do operations on yourself, like resuming yourself or asking whether 2645 // you are alive. While these can still happen, they are not subject to deadlocks if 2646 // the lock is held while the operation occurs (this is not the case for suspend, for 2647 // instance), and are very unlikely. Because IsAlive needs to be fast and its 2648 // implementation is local to this file, we always lock Threads_lock for that one. 2649 2650 static void thread_entry(JavaThread* thread, TRAPS) { 2651 HandleMark hm(THREAD); 2652 Handle obj(THREAD, thread->threadObj()); 2653 JavaValue result(T_VOID); 2654 JavaCalls::call_virtual(&result, 2655 obj, 2656 KlassHandle(THREAD, SystemDictionary::Thread_klass()), 2657 vmSymbols::run_method_name(), 2658 vmSymbols::void_method_signature(), 2659 THREAD); 2660 } 2661 2662 2663 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2664 JVMWrapper("JVM_StartThread"); 2665 JavaThread *native_thread = NULL; 2666 2667 // We cannot hold the Threads_lock when we throw an exception, 2668 // due to rank ordering issues. Example: we might need to grab the 2669 // Heap_lock while we construct the exception. 2670 bool throw_illegal_thread_state = false; 2671 2672 // We must release the Threads_lock before we can post a jvmti event 2673 // in Thread::start. 2674 { 2675 // Ensure that the C++ Thread and OSThread structures aren't freed before 2676 // we operate. 2677 MutexLocker mu(Threads_lock); 2678 2679 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2680 // re-starting an already started thread, so we should usually find 2681 // that the JavaThread is null. However for a JNI attached thread 2682 // there is a small window between the Thread object being created 2683 // (with its JavaThread set) and the update to its threadStatus, so we 2684 // have to check for this 2685 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2686 throw_illegal_thread_state = true; 2687 } else { 2688 // We could also check the stillborn flag to see if this thread was already stopped, but 2689 // for historical reasons we let the thread detect that itself when it starts running 2690 2691 jlong size = 2692 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2693 // Allocate the C++ Thread structure and create the native thread. The 2694 // stack size retrieved from java is signed, but the constructor takes 2695 // size_t (an unsigned type), so avoid passing negative values which would 2696 // result in really large stacks. 2697 size_t sz = size > 0 ? (size_t) size : 0; 2698 native_thread = new JavaThread(&thread_entry, sz); 2699 2700 // At this point it may be possible that no osthread was created for the 2701 // JavaThread due to lack of memory. Check for this situation and throw 2702 // an exception if necessary. Eventually we may want to change this so 2703 // that we only grab the lock if the thread was created successfully - 2704 // then we can also do this check and throw the exception in the 2705 // JavaThread constructor. 2706 if (native_thread->osthread() != NULL) { 2707 // Note: the current thread is not being used within "prepare". 2708 native_thread->prepare(jthread); 2709 } 2710 } 2711 } 2712 2713 if (throw_illegal_thread_state) { 2714 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2715 } 2716 2717 assert(native_thread != NULL, "Starting null thread?"); 2718 2719 if (native_thread->osthread() == NULL) { 2720 // No one should hold a reference to the 'native_thread'. 2721 delete native_thread; 2722 if (JvmtiExport::should_post_resource_exhausted()) { 2723 JvmtiExport::post_resource_exhausted( 2724 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2725 os::native_thread_creation_failed_msg()); 2726 } 2727 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2728 os::native_thread_creation_failed_msg()); 2729 } 2730 2731 Thread::start(native_thread); 2732 2733 JVM_END 2734 2735 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2736 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2737 // but is thought to be reliable and simple. In the case, where the receiver is the 2738 // same thread as the sender, no safepoint is needed. 2739 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2740 JVMWrapper("JVM_StopThread"); 2741 2742 oop java_throwable = JNIHandles::resolve(throwable); 2743 if (java_throwable == NULL) { 2744 THROW(vmSymbols::java_lang_NullPointerException()); 2745 } 2746 oop java_thread = JNIHandles::resolve_non_null(jthread); 2747 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2748 Events::log_exception(JavaThread::current(), 2749 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2750 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2751 // First check if thread is alive 2752 if (receiver != NULL) { 2753 // Check if exception is getting thrown at self (use oop equality, since the 2754 // target object might exit) 2755 if (java_thread == thread->threadObj()) { 2756 THROW_OOP(java_throwable); 2757 } else { 2758 // Enques a VM_Operation to stop all threads and then deliver the exception... 2759 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 2760 } 2761 } 2762 else { 2763 // Either: 2764 // - target thread has not been started before being stopped, or 2765 // - target thread already terminated 2766 // We could read the threadStatus to determine which case it is 2767 // but that is overkill as it doesn't matter. We must set the 2768 // stillborn flag for the first case, and if the thread has already 2769 // exited setting this flag has no affect 2770 java_lang_Thread::set_stillborn(java_thread); 2771 } 2772 JVM_END 2773 2774 2775 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2776 JVMWrapper("JVM_IsThreadAlive"); 2777 2778 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2779 return java_lang_Thread::is_alive(thread_oop); 2780 JVM_END 2781 2782 2783 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2784 JVMWrapper("JVM_SuspendThread"); 2785 oop java_thread = JNIHandles::resolve_non_null(jthread); 2786 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2787 2788 if (receiver != NULL) { 2789 // thread has run and has not exited (still on threads list) 2790 2791 { 2792 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2793 if (receiver->is_external_suspend()) { 2794 // Don't allow nested external suspend requests. We can't return 2795 // an error from this interface so just ignore the problem. 2796 return; 2797 } 2798 if (receiver->is_exiting()) { // thread is in the process of exiting 2799 return; 2800 } 2801 receiver->set_external_suspend(); 2802 } 2803 2804 // java_suspend() will catch threads in the process of exiting 2805 // and will ignore them. 2806 receiver->java_suspend(); 2807 2808 // It would be nice to have the following assertion in all the 2809 // time, but it is possible for a racing resume request to have 2810 // resumed this thread right after we suspended it. Temporarily 2811 // enable this assertion if you are chasing a different kind of 2812 // bug. 2813 // 2814 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2815 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2816 } 2817 JVM_END 2818 2819 2820 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2821 JVMWrapper("JVM_ResumeThread"); 2822 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 2823 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2824 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2825 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2826 // looks at it. 2827 MutexLocker ml(Threads_lock); 2828 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2829 if (thr != NULL) { 2830 // the thread has run and is not in the process of exiting 2831 thr->java_resume(); 2832 } 2833 JVM_END 2834 2835 2836 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2837 JVMWrapper("JVM_SetThreadPriority"); 2838 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2839 MutexLocker ml(Threads_lock); 2840 oop java_thread = JNIHandles::resolve_non_null(jthread); 2841 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2842 JavaThread* thr = java_lang_Thread::thread(java_thread); 2843 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 2844 Thread::set_priority(thr, (ThreadPriority)prio); 2845 } 2846 JVM_END 2847 2848 2849 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2850 JVMWrapper("JVM_Yield"); 2851 if (os::dont_yield()) return; 2852 HOTSPOT_THREAD_YIELD(); 2853 2854 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield. 2855 // Critical for similar threading behaviour 2856 if (ConvertYieldToSleep) { 2857 os::sleep(thread, MinSleepInterval, false); 2858 } else { 2859 os::naked_yield(); 2860 } 2861 JVM_END 2862 2863 2864 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2865 JVMWrapper("JVM_Sleep"); 2866 2867 if (millis < 0) { 2868 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2869 } 2870 2871 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2872 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2873 } 2874 2875 // Save current thread state and restore it at the end of this block. 2876 // And set new thread state to SLEEPING. 2877 JavaThreadSleepState jtss(thread); 2878 2879 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 2880 2881 EventThreadSleep event; 2882 2883 if (millis == 0) { 2884 // When ConvertSleepToYield is on, this matches the classic VM implementation of 2885 // JVM_Sleep. Critical for similar threading behaviour (Win32) 2886 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep 2887 // for SOLARIS 2888 if (ConvertSleepToYield) { 2889 os::naked_yield(); 2890 } else { 2891 ThreadState old_state = thread->osthread()->get_state(); 2892 thread->osthread()->set_state(SLEEPING); 2893 os::sleep(thread, MinSleepInterval, false); 2894 thread->osthread()->set_state(old_state); 2895 } 2896 } else { 2897 ThreadState old_state = thread->osthread()->get_state(); 2898 thread->osthread()->set_state(SLEEPING); 2899 if (os::sleep(thread, millis, true) == OS_INTRPT) { 2900 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 2901 // us while we were sleeping. We do not overwrite those. 2902 if (!HAS_PENDING_EXCEPTION) { 2903 if (event.should_commit()) { 2904 event.set_time(millis); 2905 event.commit(); 2906 } 2907 HOTSPOT_THREAD_SLEEP_END(1); 2908 2909 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 2910 // to properly restore the thread state. That's likely wrong. 2911 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2912 } 2913 } 2914 thread->osthread()->set_state(old_state); 2915 } 2916 if (event.should_commit()) { 2917 event.set_time(millis); 2918 event.commit(); 2919 } 2920 HOTSPOT_THREAD_SLEEP_END(0); 2921 JVM_END 2922 2923 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 2924 JVMWrapper("JVM_CurrentThread"); 2925 oop jthread = thread->threadObj(); 2926 assert (thread != NULL, "no current thread!"); 2927 return JNIHandles::make_local(env, jthread); 2928 JVM_END 2929 2930 2931 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 2932 JVMWrapper("JVM_CountStackFrames"); 2933 2934 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2935 oop java_thread = JNIHandles::resolve_non_null(jthread); 2936 bool throw_illegal_thread_state = false; 2937 int count = 0; 2938 2939 { 2940 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 2941 // We need to re-resolve the java_thread, since a GC might have happened during the 2942 // acquire of the lock 2943 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2944 2945 if (thr == NULL) { 2946 // do nothing 2947 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 2948 // Check whether this java thread has been suspended already. If not, throws 2949 // IllegalThreadStateException. We defer to throw that exception until 2950 // Threads_lock is released since loading exception class has to leave VM. 2951 // The correct way to test a thread is actually suspended is 2952 // wait_for_ext_suspend_completion(), but we can't call that while holding 2953 // the Threads_lock. The above tests are sufficient for our purposes 2954 // provided the walkability of the stack is stable - which it isn't 2955 // 100% but close enough for most practical purposes. 2956 throw_illegal_thread_state = true; 2957 } else { 2958 // Count all java activation, i.e., number of vframes 2959 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 2960 // Native frames are not counted 2961 if (!vfst.method()->is_native()) count++; 2962 } 2963 } 2964 } 2965 2966 if (throw_illegal_thread_state) { 2967 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 2968 "this thread is not suspended"); 2969 } 2970 return count; 2971 JVM_END 2972 2973 // Consider: A better way to implement JVM_Interrupt() is to acquire 2974 // Threads_lock to resolve the jthread into a Thread pointer, fetch 2975 // Thread->platformevent, Thread->native_thr, Thread->parker, etc., 2976 // drop Threads_lock, and the perform the unpark() and thr_kill() operations 2977 // outside the critical section. Threads_lock is hot so we want to minimize 2978 // the hold-time. A cleaner interface would be to decompose interrupt into 2979 // two steps. The 1st phase, performed under Threads_lock, would return 2980 // a closure that'd be invoked after Threads_lock was dropped. 2981 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 2982 // admit spurious wakeups. 2983 2984 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 2985 JVMWrapper("JVM_Interrupt"); 2986 2987 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2988 oop java_thread = JNIHandles::resolve_non_null(jthread); 2989 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 2990 // We need to re-resolve the java_thread, since a GC might have happened during the 2991 // acquire of the lock 2992 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2993 if (thr != NULL) { 2994 Thread::interrupt(thr); 2995 } 2996 JVM_END 2997 2998 2999 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3000 JVMWrapper("JVM_IsInterrupted"); 3001 3002 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3003 oop java_thread = JNIHandles::resolve_non_null(jthread); 3004 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3005 // We need to re-resolve the java_thread, since a GC might have happened during the 3006 // acquire of the lock 3007 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3008 if (thr == NULL) { 3009 return JNI_FALSE; 3010 } else { 3011 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3012 } 3013 JVM_END 3014 3015 3016 // Return true iff the current thread has locked the object passed in 3017 3018 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3019 JVMWrapper("JVM_HoldsLock"); 3020 assert(THREAD->is_Java_thread(), "sanity check"); 3021 if (obj == NULL) { 3022 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3023 } 3024 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3025 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3026 JVM_END 3027 3028 3029 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3030 JVMWrapper("JVM_DumpAllStacks"); 3031 VM_PrintThreads op; 3032 VMThread::execute(&op); 3033 if (JvmtiExport::should_post_data_dump()) { 3034 JvmtiExport::post_data_dump(); 3035 } 3036 JVM_END 3037 3038 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3039 JVMWrapper("JVM_SetNativeThreadName"); 3040 ResourceMark rm(THREAD); 3041 oop java_thread = JNIHandles::resolve_non_null(jthread); 3042 JavaThread* thr = java_lang_Thread::thread(java_thread); 3043 // Thread naming only supported for the current thread, doesn't work for 3044 // target threads. 3045 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3046 // we don't set the name of an attached thread to avoid stepping 3047 // on other programs 3048 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3049 os::set_native_thread_name(thread_name); 3050 } 3051 JVM_END 3052 3053 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3054 3055 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3056 assert(jthread->is_Java_thread(), "must be a Java thread"); 3057 if (jthread->privileged_stack_top() == NULL) return false; 3058 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3059 oop loader = jthread->privileged_stack_top()->class_loader(); 3060 if (loader == NULL) return true; 3061 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3062 if (trusted) return true; 3063 } 3064 return false; 3065 } 3066 3067 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3068 JVMWrapper("JVM_CurrentLoadedClass"); 3069 ResourceMark rm(THREAD); 3070 3071 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3072 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3073 bool trusted = is_trusted_frame(thread, &vfst); 3074 if (trusted) return NULL; 3075 3076 Method* m = vfst.method(); 3077 if (!m->is_native()) { 3078 InstanceKlass* holder = m->method_holder(); 3079 oop loader = holder->class_loader(); 3080 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3081 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3082 } 3083 } 3084 } 3085 return NULL; 3086 JVM_END 3087 3088 3089 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3090 JVMWrapper("JVM_CurrentClassLoader"); 3091 ResourceMark rm(THREAD); 3092 3093 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3094 3095 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3096 bool trusted = is_trusted_frame(thread, &vfst); 3097 if (trusted) return NULL; 3098 3099 Method* m = vfst.method(); 3100 if (!m->is_native()) { 3101 InstanceKlass* holder = m->method_holder(); 3102 assert(holder->is_klass(), "just checking"); 3103 oop loader = holder->class_loader(); 3104 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3105 return JNIHandles::make_local(env, loader); 3106 } 3107 } 3108 } 3109 return NULL; 3110 JVM_END 3111 3112 3113 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3114 JVMWrapper("JVM_GetClassContext"); 3115 ResourceMark rm(THREAD); 3116 JvmtiVMObjectAllocEventCollector oam; 3117 vframeStream vfst(thread); 3118 3119 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3120 // This must only be called from SecurityManager.getClassContext 3121 Method* m = vfst.method(); 3122 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3123 m->name() == vmSymbols::getClassContext_name() && 3124 m->signature() == vmSymbols::void_class_array_signature())) { 3125 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3126 } 3127 } 3128 3129 // Collect method holders 3130 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>(); 3131 for (; !vfst.at_end(); vfst.security_next()) { 3132 Method* m = vfst.method(); 3133 // Native frames are not returned 3134 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3135 Klass* holder = m->method_holder(); 3136 assert(holder->is_klass(), "just checking"); 3137 klass_array->append(holder); 3138 } 3139 } 3140 3141 // Create result array of type [Ljava/lang/Class; 3142 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3143 // Fill in mirrors corresponding to method holders 3144 for (int i = 0; i < klass_array->length(); i++) { 3145 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3146 } 3147 3148 return (jobjectArray) JNIHandles::make_local(env, result); 3149 JVM_END 3150 3151 3152 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3153 JVMWrapper("JVM_ClassDepth"); 3154 ResourceMark rm(THREAD); 3155 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3156 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3157 3158 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3159 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3160 if (class_name_sym == NULL) { 3161 return -1; 3162 } 3163 3164 int depth = 0; 3165 3166 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3167 if (!vfst.method()->is_native()) { 3168 InstanceKlass* holder = vfst.method()->method_holder(); 3169 assert(holder->is_klass(), "just checking"); 3170 if (holder->name() == class_name_sym) { 3171 return depth; 3172 } 3173 depth++; 3174 } 3175 } 3176 return -1; 3177 JVM_END 3178 3179 3180 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3181 JVMWrapper("JVM_ClassLoaderDepth"); 3182 ResourceMark rm(THREAD); 3183 int depth = 0; 3184 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3185 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3186 bool trusted = is_trusted_frame(thread, &vfst); 3187 if (trusted) return -1; 3188 3189 Method* m = vfst.method(); 3190 if (!m->is_native()) { 3191 InstanceKlass* holder = m->method_holder(); 3192 assert(holder->is_klass(), "just checking"); 3193 oop loader = holder->class_loader(); 3194 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3195 return depth; 3196 } 3197 depth++; 3198 } 3199 } 3200 return -1; 3201 JVM_END 3202 3203 3204 // java.lang.Package //////////////////////////////////////////////////////////////// 3205 3206 3207 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3208 JVMWrapper("JVM_GetSystemPackage"); 3209 ResourceMark rm(THREAD); 3210 JvmtiVMObjectAllocEventCollector oam; 3211 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3212 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3213 return (jstring) JNIHandles::make_local(result); 3214 JVM_END 3215 3216 3217 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3218 JVMWrapper("JVM_GetSystemPackages"); 3219 JvmtiVMObjectAllocEventCollector oam; 3220 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3221 return (jobjectArray) JNIHandles::make_local(result); 3222 JVM_END 3223 3224 3225 // ObjectInputStream /////////////////////////////////////////////////////////////// 3226 3227 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3228 if (current_class == NULL) { 3229 return true; 3230 } 3231 if ((current_class == field_class) || access.is_public()) { 3232 return true; 3233 } 3234 3235 if (access.is_protected()) { 3236 // See if current_class is a subclass of field_class 3237 if (current_class->is_subclass_of(field_class)) { 3238 return true; 3239 } 3240 } 3241 3242 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3243 } 3244 3245 // Return the first non-null class loader up the execution stack, or null 3246 // if only code from the null class loader is on the stack. 3247 3248 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3249 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3250 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3251 oop loader = vfst.method()->method_holder()->class_loader(); 3252 if (loader != NULL) { 3253 return JNIHandles::make_local(env, loader); 3254 } 3255 } 3256 return NULL; 3257 JVM_END 3258 3259 3260 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3261 3262 3263 // resolve array handle and check arguments 3264 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3265 if (arr == NULL) { 3266 THROW_0(vmSymbols::java_lang_NullPointerException()); 3267 } 3268 oop a = JNIHandles::resolve_non_null(arr); 3269 if (!a->is_array()) { 3270 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3271 } else if (type_array_only && !a->is_typeArray()) { 3272 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3273 } 3274 return arrayOop(a); 3275 } 3276 3277 3278 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3279 JVMWrapper("JVM_GetArrayLength"); 3280 arrayOop a = check_array(env, arr, false, CHECK_0); 3281 return a->length(); 3282 JVM_END 3283 3284 3285 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3286 JVMWrapper("JVM_Array_Get"); 3287 JvmtiVMObjectAllocEventCollector oam; 3288 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3289 jvalue value; 3290 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3291 oop box = Reflection::box(&value, type, CHECK_NULL); 3292 return JNIHandles::make_local(env, box); 3293 JVM_END 3294 3295 3296 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3297 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3298 jvalue value; 3299 value.i = 0; // to initialize value before getting used in CHECK 3300 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3301 assert(a->is_typeArray(), "just checking"); 3302 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3303 BasicType wide_type = (BasicType) wCode; 3304 if (type != wide_type) { 3305 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3306 } 3307 return value; 3308 JVM_END 3309 3310 3311 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3312 JVMWrapper("JVM_SetArrayElement"); 3313 arrayOop a = check_array(env, arr, false, CHECK); 3314 oop box = JNIHandles::resolve(val); 3315 jvalue value; 3316 value.i = 0; // to initialize value before getting used in CHECK 3317 BasicType value_type; 3318 if (a->is_objArray()) { 3319 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3320 value_type = Reflection::unbox_for_regular_object(box, &value); 3321 } else { 3322 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3323 } 3324 Reflection::array_set(&value, a, index, value_type, CHECK); 3325 JVM_END 3326 3327 3328 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3329 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3330 arrayOop a = check_array(env, arr, true, CHECK); 3331 assert(a->is_typeArray(), "just checking"); 3332 BasicType value_type = (BasicType) vCode; 3333 Reflection::array_set(&v, a, index, value_type, CHECK); 3334 JVM_END 3335 3336 3337 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3338 JVMWrapper("JVM_NewArray"); 3339 JvmtiVMObjectAllocEventCollector oam; 3340 oop element_mirror = JNIHandles::resolve(eltClass); 3341 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3342 return JNIHandles::make_local(env, result); 3343 JVM_END 3344 3345 3346 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3347 JVMWrapper("JVM_NewMultiArray"); 3348 JvmtiVMObjectAllocEventCollector oam; 3349 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3350 oop element_mirror = JNIHandles::resolve(eltClass); 3351 assert(dim_array->is_typeArray(), "just checking"); 3352 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3353 return JNIHandles::make_local(env, result); 3354 JVM_END 3355 3356 3357 // Library support /////////////////////////////////////////////////////////////////////////// 3358 3359 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3360 //%note jvm_ct 3361 JVMWrapper2("JVM_LoadLibrary (%s)", name); 3362 char ebuf[1024]; 3363 void *load_result; 3364 { 3365 ThreadToNativeFromVM ttnfvm(thread); 3366 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3367 } 3368 if (load_result == NULL) { 3369 char msg[1024]; 3370 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3371 // Since 'ebuf' may contain a string encoded using 3372 // platform encoding scheme, we need to pass 3373 // Exceptions::unsafe_to_utf8 to the new_exception method 3374 // as the last argument. See bug 6367357. 3375 Handle h_exception = 3376 Exceptions::new_exception(thread, 3377 vmSymbols::java_lang_UnsatisfiedLinkError(), 3378 msg, Exceptions::unsafe_to_utf8); 3379 3380 THROW_HANDLE_0(h_exception); 3381 } 3382 return load_result; 3383 JVM_END 3384 3385 3386 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3387 JVMWrapper("JVM_UnloadLibrary"); 3388 os::dll_unload(handle); 3389 JVM_END 3390 3391 3392 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3393 JVMWrapper2("JVM_FindLibraryEntry (%s)", name); 3394 return os::dll_lookup(handle, name); 3395 JVM_END 3396 3397 3398 // JNI version /////////////////////////////////////////////////////////////////////////////// 3399 3400 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3401 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version); 3402 return Threads::is_supported_jni_version_including_1_1(version); 3403 JVM_END 3404 3405 3406 // String support /////////////////////////////////////////////////////////////////////////// 3407 3408 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3409 JVMWrapper("JVM_InternString"); 3410 JvmtiVMObjectAllocEventCollector oam; 3411 if (str == NULL) return NULL; 3412 oop string = JNIHandles::resolve_non_null(str); 3413 oop result = StringTable::intern(string, CHECK_NULL); 3414 return (jstring) JNIHandles::make_local(env, result); 3415 JVM_END 3416 3417 3418 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3419 3420 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3421 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3422 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3423 // that only works with java threads. 3424 3425 3426 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3427 VM_Exit::block_if_vm_exited(); 3428 JVMWrapper("JVM_RawMonitorCreate"); 3429 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3430 } 3431 3432 3433 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3434 VM_Exit::block_if_vm_exited(); 3435 JVMWrapper("JVM_RawMonitorDestroy"); 3436 delete ((Mutex*) mon); 3437 } 3438 3439 3440 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3441 VM_Exit::block_if_vm_exited(); 3442 JVMWrapper("JVM_RawMonitorEnter"); 3443 ((Mutex*) mon)->jvm_raw_lock(); 3444 return 0; 3445 } 3446 3447 3448 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3449 VM_Exit::block_if_vm_exited(); 3450 JVMWrapper("JVM_RawMonitorExit"); 3451 ((Mutex*) mon)->jvm_raw_unlock(); 3452 } 3453 3454 3455 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3456 3457 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3458 Handle loader, Handle protection_domain, 3459 jboolean throwError, TRAPS) { 3460 // Security Note: 3461 // The Java level wrapper will perform the necessary security check allowing 3462 // us to pass the NULL as the initiating class loader. The VM is responsible for 3463 // the checkPackageAccess relative to the initiating class loader via the 3464 // protection_domain. The protection_domain is passed as NULL by the java code 3465 // if there is no security manager in 3-arg Class.forName(). 3466 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3467 3468 KlassHandle klass_handle(THREAD, klass); 3469 // Check if we should initialize the class 3470 if (init && klass_handle->oop_is_instance()) { 3471 klass_handle->initialize(CHECK_NULL); 3472 } 3473 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror()); 3474 } 3475 3476 3477 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3478 3479 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3480 JVMWrapper("JVM_InvokeMethod"); 3481 Handle method_handle; 3482 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3483 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3484 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3485 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3486 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3487 jobject res = JNIHandles::make_local(env, result); 3488 if (JvmtiExport::should_post_vm_object_alloc()) { 3489 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3490 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3491 if (java_lang_Class::is_primitive(ret_type)) { 3492 // Only for primitive type vm allocates memory for java object. 3493 // See box() method. 3494 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3495 } 3496 } 3497 return res; 3498 } else { 3499 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3500 } 3501 JVM_END 3502 3503 3504 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3505 JVMWrapper("JVM_NewInstanceFromConstructor"); 3506 oop constructor_mirror = JNIHandles::resolve(c); 3507 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3508 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3509 jobject res = JNIHandles::make_local(env, result); 3510 if (JvmtiExport::should_post_vm_object_alloc()) { 3511 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3512 } 3513 return res; 3514 JVM_END 3515 3516 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3517 3518 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3519 JVMWrapper("JVM_SupportsCX8"); 3520 return VM_Version::supports_cx8(); 3521 JVM_END 3522 3523 // DTrace /////////////////////////////////////////////////////////////////// 3524 3525 JVM_ENTRY(jint, JVM_DTraceGetVersion(JNIEnv* env)) 3526 JVMWrapper("JVM_DTraceGetVersion"); 3527 return (jint)JVM_TRACING_DTRACE_VERSION; 3528 JVM_END 3529 3530 JVM_ENTRY(jlong,JVM_DTraceActivate( 3531 JNIEnv* env, jint version, jstring module_name, jint providers_count, 3532 JVM_DTraceProvider* providers)) 3533 JVMWrapper("JVM_DTraceActivate"); 3534 return DTraceJSDT::activate( 3535 version, module_name, providers_count, providers, THREAD); 3536 JVM_END 3537 3538 JVM_ENTRY(jboolean,JVM_DTraceIsProbeEnabled(JNIEnv* env, jmethodID method)) 3539 JVMWrapper("JVM_DTraceIsProbeEnabled"); 3540 return DTraceJSDT::is_probe_enabled(method); 3541 JVM_END 3542 3543 JVM_ENTRY(void,JVM_DTraceDispose(JNIEnv* env, jlong handle)) 3544 JVMWrapper("JVM_DTraceDispose"); 3545 DTraceJSDT::dispose(handle); 3546 JVM_END 3547 3548 JVM_ENTRY(jboolean,JVM_DTraceIsSupported(JNIEnv* env)) 3549 JVMWrapper("JVM_DTraceIsSupported"); 3550 return DTraceJSDT::is_supported(); 3551 JVM_END 3552 3553 // Returns an array of all live Thread objects (VM internal JavaThreads, 3554 // jvmti agent threads, and JNI attaching threads are skipped) 3555 // See CR 6404306 regarding JNI attaching threads 3556 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3557 ResourceMark rm(THREAD); 3558 ThreadsListEnumerator tle(THREAD, false, false); 3559 JvmtiVMObjectAllocEventCollector oam; 3560 3561 int num_threads = tle.num_threads(); 3562 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3563 objArrayHandle threads_ah(THREAD, r); 3564 3565 for (int i = 0; i < num_threads; i++) { 3566 Handle h = tle.get_threadObj(i); 3567 threads_ah->obj_at_put(i, h()); 3568 } 3569 3570 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3571 JVM_END 3572 3573 3574 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3575 // Return StackTraceElement[][], each element is the stack trace of a thread in 3576 // the corresponding entry in the given threads array 3577 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3578 JVMWrapper("JVM_DumpThreads"); 3579 JvmtiVMObjectAllocEventCollector oam; 3580 3581 // Check if threads is null 3582 if (threads == NULL) { 3583 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3584 } 3585 3586 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3587 objArrayHandle ah(THREAD, a); 3588 int num_threads = ah->length(); 3589 // check if threads is non-empty array 3590 if (num_threads == 0) { 3591 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3592 } 3593 3594 // check if threads is not an array of objects of Thread class 3595 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3596 if (k != SystemDictionary::Thread_klass()) { 3597 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3598 } 3599 3600 ResourceMark rm(THREAD); 3601 3602 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3603 for (int i = 0; i < num_threads; i++) { 3604 oop thread_obj = ah->obj_at(i); 3605 instanceHandle h(THREAD, (instanceOop) thread_obj); 3606 thread_handle_array->append(h); 3607 } 3608 3609 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3610 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3611 3612 JVM_END 3613 3614 // JVM monitoring and management support 3615 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3616 return Management::get_jmm_interface(version); 3617 JVM_END 3618 3619 // com.sun.tools.attach.VirtualMachine agent properties support 3620 // 3621 // Initialize the agent properties with the properties maintained in the VM 3622 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3623 JVMWrapper("JVM_InitAgentProperties"); 3624 ResourceMark rm; 3625 3626 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3627 3628 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3629 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3630 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3631 return properties; 3632 JVM_END 3633 3634 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3635 { 3636 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3637 JvmtiVMObjectAllocEventCollector oam; 3638 3639 if (ofClass == NULL) { 3640 return NULL; 3641 } 3642 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3643 // Special handling for primitive objects 3644 if (java_lang_Class::is_primitive(mirror())) { 3645 return NULL; 3646 } 3647 Klass* k = java_lang_Class::as_Klass(mirror()); 3648 if (!k->oop_is_instance()) { 3649 return NULL; 3650 } 3651 instanceKlassHandle ik_h(THREAD, k); 3652 int encl_method_class_idx = ik_h->enclosing_method_class_index(); 3653 if (encl_method_class_idx == 0) { 3654 return NULL; 3655 } 3656 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3657 objArrayHandle dest(THREAD, dest_o); 3658 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3659 dest->obj_at_put(0, enc_k->java_mirror()); 3660 int encl_method_method_idx = ik_h->enclosing_method_method_index(); 3661 if (encl_method_method_idx != 0) { 3662 Symbol* sym = ik_h->constants()->symbol_at( 3663 extract_low_short_from_int( 3664 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3665 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3666 dest->obj_at_put(1, str()); 3667 sym = ik_h->constants()->symbol_at( 3668 extract_high_short_from_int( 3669 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3670 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3671 dest->obj_at_put(2, str()); 3672 } 3673 return (jobjectArray) JNIHandles::make_local(dest()); 3674 } 3675 JVM_END 3676 3677 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3678 { 3679 memset(info, 0, info_size); 3680 3681 info->jvm_version = Abstract_VM_Version::jvm_version(); 3682 info->update_version = 0; /* 0 in HotSpot Express VM */ 3683 info->special_update_version = 0; /* 0 in HotSpot Express VM */ 3684 3685 // when we add a new capability in the jvm_version_info struct, we should also 3686 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3687 // counter defined in runtimeService.cpp. 3688 info->is_attachable = AttachListener::is_attach_supported(); 3689 } 3690 JVM_END