1 /* 2 * Copyright (c) 1997, 2015, 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.inline.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/barrierSet.inline.hpp" 35 #include "memory/oopFactory.hpp" 36 #include "memory/universe.inline.hpp" 37 #include "oops/fieldStreams.hpp" 38 #include "oops/instanceKlass.hpp" 39 #include "oops/objArrayKlass.hpp" 40 #include "oops/objArrayOop.inline.hpp" 41 #include "oops/method.hpp" 42 #include "oops/oop.inline.hpp" 43 #include "prims/jvm.h" 44 #include "prims/jvm_misc.hpp" 45 #include "prims/jvmtiExport.hpp" 46 #include "prims/jvmtiThreadState.hpp" 47 #include "prims/nativeLookup.hpp" 48 #include "prims/privilegedStack.hpp" 49 #include "runtime/arguments.hpp" 50 #include "runtime/atomic.inline.hpp" 51 #include "runtime/handles.inline.hpp" 52 #include "runtime/init.hpp" 53 #include "runtime/interfaceSupport.hpp" 54 #include "runtime/java.hpp" 55 #include "runtime/javaCalls.hpp" 56 #include "runtime/jfieldIDWorkaround.hpp" 57 #include "runtime/orderAccess.inline.hpp" 58 #include "runtime/os.inline.hpp" 59 #include "runtime/perfData.hpp" 60 #include "runtime/reflection.hpp" 61 #include "runtime/thread.inline.hpp" 62 #include "runtime/vframe.hpp" 63 #include "runtime/vm_operations.hpp" 64 #include "runtime/vm_version.hpp" 65 #include "services/attachListener.hpp" 66 #include "services/management.hpp" 67 #include "services/threadService.hpp" 68 #include "trace/tracing.hpp" 69 #include "utilities/copy.hpp" 70 #include "utilities/defaultStream.hpp" 71 #include "utilities/dtrace.hpp" 72 #include "utilities/events.hpp" 73 #include "utilities/histogram.hpp" 74 #include "utilities/macros.hpp" 75 #include "utilities/top.hpp" 76 #include "utilities/utf8.hpp" 77 #if INCLUDE_CDS 78 #include "classfile/sharedClassUtil.hpp" 79 #include "classfile/systemDictionaryShared.hpp" 80 #endif 81 #ifdef TARGET_OS_FAMILY_linux 82 # include "jvm_linux.h" 83 #endif 84 #ifdef TARGET_OS_FAMILY_solaris 85 # include "jvm_solaris.h" 86 #endif 87 #ifdef TARGET_OS_FAMILY_windows 88 # include "jvm_windows.h" 89 #endif 90 #ifdef TARGET_OS_FAMILY_aix 91 # include "jvm_aix.h" 92 #endif 93 #ifdef TARGET_OS_FAMILY_bsd 94 # include "jvm_bsd.h" 95 #endif 96 97 #include <errno.h> 98 99 /* 100 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 101 such ctors and calls MUST NOT come between an oop declaration/init and its 102 usage because if objects are move this may cause various memory stomps, bus 103 errors and segfaults. Here is a cookbook for causing so called "naked oop 104 failures": 105 106 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 107 JVMWrapper("JVM_GetClassDeclaredFields"); 108 109 // Object address to be held directly in mirror & not visible to GC 110 oop mirror = JNIHandles::resolve_non_null(ofClass); 111 112 // If this ctor can hit a safepoint, moving objects around, then 113 ComplexConstructor foo; 114 115 // Boom! mirror may point to JUNK instead of the intended object 116 (some dereference of mirror) 117 118 // Here's another call that may block for GC, making mirror stale 119 MutexLocker ml(some_lock); 120 121 // And here's an initializer that can result in a stale oop 122 // all in one step. 123 oop o = call_that_can_throw_exception(TRAPS); 124 125 126 The solution is to keep the oop declaration BELOW the ctor or function 127 call that might cause a GC, do another resolve to reassign the oop, or 128 consider use of a Handle instead of an oop so there is immunity from object 129 motion. But note that the "QUICK" entries below do not have a handlemark 130 and thus can only support use of handles passed in. 131 */ 132 133 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 134 ResourceMark rm; 135 int line_number = -1; 136 const char * source_file = NULL; 137 const char * trace = "explicit"; 138 InstanceKlass* caller = NULL; 139 JavaThread* jthread = JavaThread::current(); 140 if (jthread->has_last_Java_frame()) { 141 vframeStream vfst(jthread); 142 143 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 144 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 145 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 146 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 147 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 148 149 Method* last_caller = NULL; 150 151 while (!vfst.at_end()) { 152 Method* m = vfst.method(); 153 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 154 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 155 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 156 break; 157 } 158 last_caller = m; 159 vfst.next(); 160 } 161 // if this is called from Class.forName0 and that is called from Class.forName, 162 // then print the caller of Class.forName. If this is Class.loadClass, then print 163 // that caller, otherwise keep quiet since this should be picked up elsewhere. 164 bool found_it = false; 165 if (!vfst.at_end() && 166 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 167 vfst.method()->name() == vmSymbols::forName0_name()) { 168 vfst.next(); 169 if (!vfst.at_end() && 170 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 171 vfst.method()->name() == vmSymbols::forName_name()) { 172 vfst.next(); 173 found_it = true; 174 } 175 } else if (last_caller != NULL && 176 last_caller->method_holder()->name() == 177 vmSymbols::java_lang_ClassLoader() && 178 (last_caller->name() == vmSymbols::loadClassInternal_name() || 179 last_caller->name() == vmSymbols::loadClass_name())) { 180 found_it = true; 181 } else if (!vfst.at_end()) { 182 if (vfst.method()->is_native()) { 183 // JNI call 184 found_it = true; 185 } 186 } 187 if (found_it && !vfst.at_end()) { 188 // found the caller 189 caller = vfst.method()->method_holder(); 190 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 191 if (line_number == -1) { 192 // show method name if it's a native method 193 trace = vfst.method()->name_and_sig_as_C_string(); 194 } 195 Symbol* s = caller->source_file_name(); 196 if (s != NULL) { 197 source_file = s->as_C_string(); 198 } 199 } 200 } 201 if (caller != NULL) { 202 if (to_class != caller) { 203 const char * from = caller->external_name(); 204 const char * to = to_class->external_name(); 205 // print in a single call to reduce interleaving between threads 206 if (source_file != NULL) { 207 tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace); 208 } else { 209 tty->print("RESOLVE %s %s (%s)\n", from, to, trace); 210 } 211 } 212 } 213 } 214 215 void trace_class_resolution(Klass* to_class) { 216 EXCEPTION_MARK; 217 trace_class_resolution_impl(to_class, THREAD); 218 if (HAS_PENDING_EXCEPTION) { 219 CLEAR_PENDING_EXCEPTION; 220 } 221 } 222 223 // Wrapper to trace JVM functions 224 225 #ifdef ASSERT 226 class JVMTraceWrapper : public StackObj { 227 public: 228 JVMTraceWrapper(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) { 229 if (TraceJVMCalls) { 230 va_list ap; 231 va_start(ap, format); 232 tty->print("JVM "); 233 tty->vprint_cr(format, ap); 234 va_end(ap); 235 } 236 } 237 }; 238 239 Histogram* JVMHistogram; 240 volatile jint JVMHistogram_lock = 0; 241 242 class JVMHistogramElement : public HistogramElement { 243 public: 244 JVMHistogramElement(const char* name); 245 }; 246 247 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 248 _name = elementName; 249 uintx count = 0; 250 251 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 252 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 253 count +=1; 254 if ( (WarnOnStalledSpinLock > 0) 255 && (count % WarnOnStalledSpinLock == 0)) { 256 warning("JVMHistogram_lock seems to be stalled"); 257 } 258 } 259 } 260 261 if(JVMHistogram == NULL) 262 JVMHistogram = new Histogram("JVM Call Counts",100); 263 264 JVMHistogram->add_element(this); 265 Atomic::dec(&JVMHistogram_lock); 266 } 267 268 #define JVMCountWrapper(arg) \ 269 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 270 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 271 272 #define JVMWrapper(arg1) JVMCountWrapper(arg1); JVMTraceWrapper(arg1) 273 #define JVMWrapper2(arg1, arg2) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2) 274 #define JVMWrapper3(arg1, arg2, arg3) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3) 275 #define JVMWrapper4(arg1, arg2, arg3, arg4) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3, arg4) 276 #else 277 #define JVMWrapper(arg1) 278 #define JVMWrapper2(arg1, arg2) 279 #define JVMWrapper3(arg1, arg2, arg3) 280 #define JVMWrapper4(arg1, arg2, arg3, arg4) 281 #endif 282 283 284 // Interface version ///////////////////////////////////////////////////////////////////// 285 286 287 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 288 return JVM_INTERFACE_VERSION; 289 JVM_END 290 291 292 // java.lang.System ////////////////////////////////////////////////////////////////////// 293 294 295 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 296 JVMWrapper("JVM_CurrentTimeMillis"); 297 return os::javaTimeMillis(); 298 JVM_END 299 300 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 301 JVMWrapper("JVM_NanoTime"); 302 return os::javaTimeNanos(); 303 JVM_END 304 305 // The function below is actually exposed by sun.misc.VM and not 306 // java.lang.System, but we choose to keep it here so that it stays next 307 // to JVM_CurrentTimeMillis and JVM_NanoTime 308 309 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 310 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 311 312 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 313 JVMWrapper("JVM_GetNanoTimeAdjustment"); 314 jlong seconds; 315 jlong nanos; 316 317 os::javaTimeSystemUTC(seconds, nanos); 318 319 // We're going to verify that the result can fit in a long. 320 // For that we need the difference in seconds between 'seconds' 321 // and 'offset_secs' to be such that: 322 // |seconds - offset_secs| < (2^63/10^9) 323 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 324 // which makes |seconds - offset_secs| < 2^33 325 // and we will prefer +/- 2^32 as the maximum acceptable diff 326 // as 2^32 has a more natural feel than 2^33... 327 // 328 // So if |seconds - offset_secs| >= 2^32 - we return a special 329 // sentinel value (-1) which the caller should take as an 330 // exception value indicating that the offset given to us is 331 // too far from range of the current time - leading to too big 332 // a nano adjustment. The caller is expected to recover by 333 // computing a more accurate offset and calling this method 334 // again. (For the record 2^32 secs is ~136 years, so that 335 // should rarely happen) 336 // 337 jlong diff = seconds - offset_secs; 338 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 339 return -1; // sentinel value: the offset is too far off the target 340 } 341 342 // return the adjustment. If you compute a time by adding 343 // this number of nanoseconds along with the number of seconds 344 // in the offset you should get the current UTC time. 345 return (diff * (jlong)1000000000) + nanos; 346 JVM_END 347 348 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 349 jobject dst, jint dst_pos, jint length)) 350 JVMWrapper("JVM_ArrayCopy"); 351 // Check if we have null pointers 352 if (src == NULL || dst == NULL) { 353 THROW(vmSymbols::java_lang_NullPointerException()); 354 } 355 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 356 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 357 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop"); 358 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop"); 359 // Do copy 360 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 361 JVM_END 362 363 364 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 365 JavaValue r(T_OBJECT); 366 // public synchronized Object put(Object key, Object value); 367 HandleMark hm(THREAD); 368 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 369 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 370 JavaCalls::call_virtual(&r, 371 props, 372 KlassHandle(THREAD, SystemDictionary::Properties_klass()), 373 vmSymbols::put_name(), 374 vmSymbols::object_object_object_signature(), 375 key_str, 376 value_str, 377 THREAD); 378 } 379 380 381 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 382 383 384 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 385 JVMWrapper("JVM_InitProperties"); 386 ResourceMark rm; 387 388 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 389 390 // System property list includes both user set via -D option and 391 // jvm system specific properties. 392 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 393 PUTPROP(props, p->key(), p->value()); 394 } 395 396 // Convert the -XX:MaxDirectMemorySize= command line flag 397 // to the sun.nio.MaxDirectMemorySize property. 398 // Do this after setting user properties to prevent people 399 // from setting the value with a -D option, as requested. 400 { 401 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 402 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 403 } else { 404 char as_chars[256]; 405 jio_snprintf(as_chars, sizeof(as_chars), SIZE_FORMAT, MaxDirectMemorySize); 406 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 407 } 408 } 409 410 // JVM monitoring and management support 411 // Add the sun.management.compiler property for the compiler's name 412 { 413 #undef CSIZE 414 #if defined(_LP64) || defined(_WIN64) 415 #define CSIZE "64-Bit " 416 #else 417 #define CSIZE 418 #endif // 64bit 419 420 #ifdef TIERED 421 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 422 #else 423 #if defined(COMPILER1) 424 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 425 #elif defined(COMPILER2) 426 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 427 #else 428 const char* compiler_name = ""; 429 #endif // compilers 430 #endif // TIERED 431 432 if (*compiler_name != '\0' && 433 (Arguments::mode() != Arguments::_int)) { 434 PUTPROP(props, "sun.management.compiler", compiler_name); 435 } 436 } 437 438 return properties; 439 JVM_END 440 441 442 /* 443 * Return the temporary directory that the VM uses for the attach 444 * and perf data files. 445 * 446 * It is important that this directory is well-known and the 447 * same for all VM instances. It cannot be affected by configuration 448 * variables such as java.io.tmpdir. 449 */ 450 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 451 JVMWrapper("JVM_GetTemporaryDirectory"); 452 HandleMark hm(THREAD); 453 const char* temp_dir = os::get_temp_directory(); 454 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 455 return (jstring) JNIHandles::make_local(env, h()); 456 JVM_END 457 458 459 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 460 461 extern volatile jint vm_created; 462 463 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 464 before_exit(thread); 465 vm_exit(code); 466 JVM_END 467 468 469 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 470 JVMWrapper("JVM_GC"); 471 if (!DisableExplicitGC) { 472 Universe::heap()->collect(GCCause::_java_lang_system_gc); 473 } 474 JVM_END 475 476 477 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 478 JVMWrapper("JVM_MaxObjectInspectionAge"); 479 return Universe::heap()->millis_since_last_gc(); 480 JVM_END 481 482 483 static inline jlong convert_size_t_to_jlong(size_t val) { 484 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 485 NOT_LP64 (return (jlong)val;) 486 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 487 } 488 489 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 490 JVMWrapper("JVM_TotalMemory"); 491 size_t n = Universe::heap()->capacity(); 492 return convert_size_t_to_jlong(n); 493 JVM_END 494 495 496 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 497 JVMWrapper("JVM_FreeMemory"); 498 CollectedHeap* ch = Universe::heap(); 499 size_t n; 500 { 501 MutexLocker x(Heap_lock); 502 n = ch->capacity() - ch->used(); 503 } 504 return convert_size_t_to_jlong(n); 505 JVM_END 506 507 508 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 509 JVMWrapper("JVM_MaxMemory"); 510 size_t n = Universe::heap()->max_capacity(); 511 return convert_size_t_to_jlong(n); 512 JVM_END 513 514 515 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 516 JVMWrapper("JVM_ActiveProcessorCount"); 517 return os::active_processor_count(); 518 JVM_END 519 520 521 522 // java.lang.Throwable ////////////////////////////////////////////////////// 523 524 525 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 526 JVMWrapper("JVM_FillInStackTrace"); 527 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 528 java_lang_Throwable::fill_in_stack_trace(exception); 529 JVM_END 530 531 532 JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable)) 533 JVMWrapper("JVM_GetStackTraceDepth"); 534 oop exception = JNIHandles::resolve(throwable); 535 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD); 536 JVM_END 537 538 539 JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index)) 540 JVMWrapper("JVM_GetStackTraceElement"); 541 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC 542 oop exception = JNIHandles::resolve(throwable); 543 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL); 544 return JNIHandles::make_local(env, element); 545 JVM_END 546 547 548 // java.lang.Object /////////////////////////////////////////////// 549 550 551 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 552 JVMWrapper("JVM_IHashCode"); 553 // as implemented in the classic virtual machine; return 0 if object is NULL 554 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 555 JVM_END 556 557 558 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 559 JVMWrapper("JVM_MonitorWait"); 560 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 561 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 562 if (JvmtiExport::should_post_monitor_wait()) { 563 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 564 565 // The current thread already owns the monitor and it has not yet 566 // been added to the wait queue so the current thread cannot be 567 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 568 // event handler cannot accidentally consume an unpark() meant for 569 // the ParkEvent associated with this ObjectMonitor. 570 } 571 ObjectSynchronizer::wait(obj, ms, CHECK); 572 JVM_END 573 574 575 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 576 JVMWrapper("JVM_MonitorNotify"); 577 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 578 ObjectSynchronizer::notify(obj, CHECK); 579 JVM_END 580 581 582 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 583 JVMWrapper("JVM_MonitorNotifyAll"); 584 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 585 ObjectSynchronizer::notifyall(obj, CHECK); 586 JVM_END 587 588 589 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 590 JVMWrapper("JVM_Clone"); 591 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 592 const KlassHandle klass (THREAD, obj->klass()); 593 JvmtiVMObjectAllocEventCollector oam; 594 595 #ifdef ASSERT 596 // Just checking that the cloneable flag is set correct 597 if (obj->is_array()) { 598 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 599 } else { 600 guarantee(obj->is_instance(), "should be instanceOop"); 601 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 602 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 603 } 604 #endif 605 606 // Check if class of obj supports the Cloneable interface. 607 // All arrays are considered to be cloneable (See JLS 20.1.5) 608 if (!klass->is_cloneable()) { 609 ResourceMark rm(THREAD); 610 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 611 } 612 613 // Make shallow object copy 614 const int size = obj->size(); 615 oop new_obj_oop = NULL; 616 if (obj->is_array()) { 617 const int length = ((arrayOop)obj())->length(); 618 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 619 } else { 620 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 621 } 622 623 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread 624 // is modifying a reference field in the clonee, a non-oop-atomic copy might 625 // be suspended in the middle of copying the pointer and end up with parts 626 // of two different pointers in the field. Subsequent dereferences will crash. 627 // 4846409: an oop-copy of objects with long or double fields or arrays of same 628 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead 629 // of oops. We know objects are aligned on a minimum of an jlong boundary. 630 // The same is true of StubRoutines::object_copy and the various oop_copy 631 // variants, and of the code generated by the inline_native_clone intrinsic. 632 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); 633 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop, 634 (size_t)align_object_size(size) / HeapWordsPerLong); 635 // Clear the header 636 new_obj_oop->init_mark(); 637 638 // Store check (mark entire object and let gc sort it out) 639 BarrierSet* bs = Universe::heap()->barrier_set(); 640 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); 641 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); 642 643 Handle new_obj(THREAD, new_obj_oop); 644 // Special handling for MemberNames. Since they contain Method* metadata, they 645 // must be registered so that RedefineClasses can fix metadata contained in them. 646 if (java_lang_invoke_MemberName::is_instance(new_obj()) && 647 java_lang_invoke_MemberName::is_method(new_obj())) { 648 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj()); 649 // MemberName may be unresolved, so doesn't need registration until resolved. 650 if (method != NULL) { 651 methodHandle m(THREAD, method); 652 // This can safepoint and redefine method, so need both new_obj and method 653 // in a handle, for two different reasons. new_obj can move, method can be 654 // deleted if nothing is using it on the stack. 655 m->method_holder()->add_member_name(new_obj()); 656 } 657 } 658 659 // Caution: this involves a java upcall, so the clone should be 660 // "gc-robust" by this stage. 661 if (klass->has_finalizer()) { 662 assert(obj->is_instance(), "should be instanceOop"); 663 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 664 new_obj = Handle(THREAD, new_obj_oop); 665 } 666 667 return JNIHandles::make_local(env, new_obj()); 668 JVM_END 669 670 // java.io.File /////////////////////////////////////////////////////////////// 671 672 JVM_LEAF(char*, JVM_NativePath(char* path)) 673 JVMWrapper2("JVM_NativePath (%s)", path); 674 return os::native_path(path); 675 JVM_END 676 677 678 // Misc. class handling /////////////////////////////////////////////////////////// 679 680 681 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 682 JVMWrapper("JVM_GetCallerClass"); 683 684 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 685 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 686 // temporarily for existing code to use until a replacement API is defined. 687 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 688 Klass* k = thread->security_get_caller_class(depth); 689 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 690 } 691 692 // Getting the class of the caller frame. 693 // 694 // The call stack at this point looks something like this: 695 // 696 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 697 // [1] [ @CallerSensitive API.method ] 698 // [.] [ (skipped intermediate frames) ] 699 // [n] [ caller ] 700 vframeStream vfst(thread); 701 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 702 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 703 Method* m = vfst.method(); 704 assert(m != NULL, "sanity"); 705 switch (n) { 706 case 0: 707 // This must only be called from Reflection.getCallerClass 708 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 709 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 710 } 711 // fall-through 712 case 1: 713 // Frame 0 and 1 must be caller sensitive. 714 if (!m->caller_sensitive()) { 715 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 716 } 717 break; 718 default: 719 if (!m->is_ignored_by_security_stack_walk()) { 720 // We have reached the desired frame; return the holder class. 721 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 722 } 723 break; 724 } 725 } 726 return NULL; 727 JVM_END 728 729 730 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 731 JVMWrapper("JVM_FindPrimitiveClass"); 732 oop mirror = NULL; 733 BasicType t = name2type(utf); 734 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 735 mirror = Universe::java_mirror(t); 736 } 737 if (mirror == NULL) { 738 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 739 } else { 740 return (jclass) JNIHandles::make_local(env, mirror); 741 } 742 JVM_END 743 744 745 // Returns a class loaded by the bootstrap class loader; or null 746 // if not found. ClassNotFoundException is not thrown. 747 // FindClassFromBootLoader is exported to the launcher for windows. 748 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 749 const char* name)) 750 JVMWrapper2("JVM_FindClassFromBootLoader %s", name); 751 752 // Java libraries should ensure that name is never null... 753 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 754 // It's impossible to create this class; the name cannot fit 755 // into the constant pool. 756 return NULL; 757 } 758 759 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 760 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 761 if (k == NULL) { 762 return NULL; 763 } 764 765 if (TraceClassResolution) { 766 trace_class_resolution(k); 767 } 768 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 769 JVM_END 770 771 // Find a class with this name in this loader, using the caller's protection domain. 772 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 773 jboolean init, jobject loader, 774 jclass caller)) 775 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name); 776 // Java libraries should ensure that name is never null... 777 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 778 // It's impossible to create this class; the name cannot fit 779 // into the constant pool. 780 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 781 } 782 783 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 784 785 oop loader_oop = JNIHandles::resolve(loader); 786 oop from_class = JNIHandles::resolve(caller); 787 oop protection_domain = NULL; 788 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 789 // NPE. Put it in another way, the bootstrap class loader has all permission and 790 // thus no checkPackageAccess equivalence in the VM class loader. 791 // The caller is also passed as NULL by the java code if there is no security 792 // manager to avoid the performance cost of getting the calling class. 793 if (from_class != NULL && loader_oop != NULL) { 794 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 795 } 796 797 Handle h_loader(THREAD, loader_oop); 798 Handle h_prot(THREAD, protection_domain); 799 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 800 h_prot, false, THREAD); 801 802 if (TraceClassResolution && result != NULL) { 803 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 804 } 805 return result; 806 JVM_END 807 808 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 809 jboolean init, jclass from)) 810 JVMWrapper2("JVM_FindClassFromClass %s", name); 811 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 812 // It's impossible to create this class; the name cannot fit 813 // into the constant pool. 814 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 815 } 816 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 817 oop from_class_oop = JNIHandles::resolve(from); 818 Klass* from_class = (from_class_oop == NULL) 819 ? (Klass*)NULL 820 : java_lang_Class::as_Klass(from_class_oop); 821 oop class_loader = NULL; 822 oop protection_domain = NULL; 823 if (from_class != NULL) { 824 class_loader = from_class->class_loader(); 825 protection_domain = from_class->protection_domain(); 826 } 827 Handle h_loader(THREAD, class_loader); 828 Handle h_prot (THREAD, protection_domain); 829 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 830 h_prot, true, thread); 831 832 if (TraceClassResolution && result != NULL) { 833 // this function is generally only used for class loading during verification. 834 ResourceMark rm; 835 oop from_mirror = JNIHandles::resolve_non_null(from); 836 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 837 const char * from_name = from_class->external_name(); 838 839 oop mirror = JNIHandles::resolve_non_null(result); 840 Klass* to_class = java_lang_Class::as_Klass(mirror); 841 const char * to = to_class->external_name(); 842 tty->print("RESOLVE %s %s (verification)\n", from_name, to); 843 } 844 845 return result; 846 JVM_END 847 848 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 849 if (loader.is_null()) { 850 return; 851 } 852 853 // check whether the current caller thread holds the lock or not. 854 // If not, increment the corresponding counter 855 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 856 ObjectSynchronizer::owner_self) { 857 counter->inc(); 858 } 859 } 860 861 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 862 // and JVM_DefineClassWithSourceCond() 863 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 864 jobject loader, const jbyte *buf, 865 jsize len, jobject pd, const char *source, 866 jboolean verify, TRAPS) { 867 if (source == NULL) source = "__JVM_DefineClass__"; 868 869 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 870 JavaThread* jt = (JavaThread*) THREAD; 871 872 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 873 ClassLoader::perf_define_appclass_selftime(), 874 ClassLoader::perf_define_appclasses(), 875 jt->get_thread_stat()->perf_recursion_counts_addr(), 876 jt->get_thread_stat()->perf_timers_addr(), 877 PerfClassTraceTime::DEFINE_CLASS); 878 879 if (UsePerfData) { 880 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 881 } 882 883 // Since exceptions can be thrown, class initialization can take place 884 // if name is NULL no check for class name in .class stream has to be made. 885 TempNewSymbol class_name = NULL; 886 if (name != NULL) { 887 const int str_len = (int)strlen(name); 888 if (str_len > Symbol::max_length()) { 889 // It's impossible to create this class; the name cannot fit 890 // into the constant pool. 891 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 892 } 893 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 894 } 895 896 ResourceMark rm(THREAD); 897 ClassFileStream st((u1*) buf, len, (char *)source); 898 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 899 if (UsePerfData) { 900 is_lock_held_by_thread(class_loader, 901 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 902 THREAD); 903 } 904 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 905 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader, 906 protection_domain, &st, 907 verify != 0, 908 CHECK_NULL); 909 910 if (TraceClassResolution && k != NULL) { 911 trace_class_resolution(k); 912 } 913 914 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 915 } 916 917 918 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 919 JVMWrapper2("JVM_DefineClass %s", name); 920 921 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD); 922 JVM_END 923 924 925 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 926 JVMWrapper2("JVM_DefineClassWithSource %s", name); 927 928 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD); 929 JVM_END 930 931 JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name, 932 jobject loader, const jbyte *buf, 933 jsize len, jobject pd, 934 const char *source, jboolean verify)) 935 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name); 936 937 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD); 938 JVM_END 939 940 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 941 JVMWrapper("JVM_FindLoadedClass"); 942 ResourceMark rm(THREAD); 943 944 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 945 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 946 947 const char* str = java_lang_String::as_utf8_string(string()); 948 // Sanity check, don't expect null 949 if (str == NULL) return NULL; 950 951 const int str_len = (int)strlen(str); 952 if (str_len > Symbol::max_length()) { 953 // It's impossible to create this class; the name cannot fit 954 // into the constant pool. 955 return NULL; 956 } 957 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 958 959 // Security Note: 960 // The Java level wrapper will perform the necessary security check allowing 961 // us to pass the NULL as the initiating class loader. 962 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 963 if (UsePerfData) { 964 is_lock_held_by_thread(h_loader, 965 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 966 THREAD); 967 } 968 969 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 970 h_loader, 971 Handle(), 972 CHECK_NULL); 973 #if INCLUDE_CDS 974 if (k == NULL) { 975 // If the class is not already loaded, try to see if it's in the shared 976 // archive for the current classloader (h_loader). 977 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class( 978 klass_name, h_loader, CHECK_NULL); 979 k = ik(); 980 } 981 #endif 982 return (k == NULL) ? NULL : 983 (jclass) JNIHandles::make_local(env, k->java_mirror()); 984 JVM_END 985 986 987 // Reflection support ////////////////////////////////////////////////////////////////////////////// 988 989 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 990 assert (cls != NULL, "illegal class"); 991 JVMWrapper("JVM_GetClassName"); 992 JvmtiVMObjectAllocEventCollector oam; 993 ResourceMark rm(THREAD); 994 const char* name; 995 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 996 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 997 } else { 998 // Consider caching interned string in Klass 999 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1000 assert(k->is_klass(), "just checking"); 1001 name = k->external_name(); 1002 } 1003 oop result = StringTable::intern((char*) name, CHECK_NULL); 1004 return (jstring) JNIHandles::make_local(env, result); 1005 JVM_END 1006 1007 1008 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1009 JVMWrapper("JVM_GetClassInterfaces"); 1010 JvmtiVMObjectAllocEventCollector oam; 1011 oop mirror = JNIHandles::resolve_non_null(cls); 1012 1013 // Special handling for primitive objects 1014 if (java_lang_Class::is_primitive(mirror)) { 1015 // Primitive objects does not have any interfaces 1016 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1017 return (jobjectArray) JNIHandles::make_local(env, r); 1018 } 1019 1020 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror)); 1021 // Figure size of result array 1022 int size; 1023 if (klass->oop_is_instance()) { 1024 size = InstanceKlass::cast(klass())->local_interfaces()->length(); 1025 } else { 1026 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass"); 1027 size = 2; 1028 } 1029 1030 // Allocate result array 1031 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1032 objArrayHandle result (THREAD, r); 1033 // Fill in result 1034 if (klass->oop_is_instance()) { 1035 // Regular instance klass, fill in all local interfaces 1036 for (int index = 0; index < size; index++) { 1037 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index); 1038 result->obj_at_put(index, k->java_mirror()); 1039 } 1040 } else { 1041 // All arrays implement java.lang.Cloneable and java.io.Serializable 1042 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1043 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1044 } 1045 return (jobjectArray) JNIHandles::make_local(env, result()); 1046 JVM_END 1047 1048 1049 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1050 JVMWrapper("JVM_IsInterface"); 1051 oop mirror = JNIHandles::resolve_non_null(cls); 1052 if (java_lang_Class::is_primitive(mirror)) { 1053 return JNI_FALSE; 1054 } 1055 Klass* k = java_lang_Class::as_Klass(mirror); 1056 jboolean result = k->is_interface(); 1057 assert(!result || k->oop_is_instance(), 1058 "all interfaces are instance types"); 1059 // The compiler intrinsic for isInterface tests the 1060 // Klass::_access_flags bits in the same way. 1061 return result; 1062 JVM_END 1063 1064 1065 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1066 JVMWrapper("JVM_GetClassSigners"); 1067 JvmtiVMObjectAllocEventCollector oam; 1068 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1069 // There are no signers for primitive types 1070 return NULL; 1071 } 1072 1073 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1074 1075 // If there are no signers set in the class, or if the class 1076 // is an array, return NULL. 1077 if (signers == NULL) return NULL; 1078 1079 // copy of the signers array 1080 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1081 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1082 for (int index = 0; index < signers->length(); index++) { 1083 signers_copy->obj_at_put(index, signers->obj_at(index)); 1084 } 1085 1086 // return the copy 1087 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1088 JVM_END 1089 1090 1091 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1092 JVMWrapper("JVM_SetClassSigners"); 1093 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1094 // This call is ignored for primitive types and arrays. 1095 // Signers are only set once, ClassLoader.java, and thus shouldn't 1096 // be called with an array. Only the bootstrap loader creates arrays. 1097 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1098 if (k->oop_is_instance()) { 1099 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1100 } 1101 } 1102 JVM_END 1103 1104 1105 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1106 JVMWrapper("JVM_GetProtectionDomain"); 1107 if (JNIHandles::resolve(cls) == NULL) { 1108 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1109 } 1110 1111 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1112 // Primitive types does not have a protection domain. 1113 return NULL; 1114 } 1115 1116 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1117 return (jobject) JNIHandles::make_local(env, pd); 1118 JVM_END 1119 1120 1121 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) { 1122 // If there is a security manager and protection domain, check the access 1123 // in the protection domain, otherwise it is authorized. 1124 if (java_lang_System::has_security_manager()) { 1125 1126 // For bootstrapping, if pd implies method isn't in the JDK, allow 1127 // this context to revert to older behavior. 1128 // In this case the isAuthorized field in AccessControlContext is also not 1129 // present. 1130 if (Universe::protection_domain_implies_method() == NULL) { 1131 return true; 1132 } 1133 1134 // Whitelist certain access control contexts 1135 if (java_security_AccessControlContext::is_authorized(context)) { 1136 return true; 1137 } 1138 1139 oop prot = klass->protection_domain(); 1140 if (prot != NULL) { 1141 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1142 // in the new wrapper. 1143 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1144 Handle h_prot(THREAD, prot); 1145 JavaValue result(T_BOOLEAN); 1146 JavaCallArguments args(h_prot); 1147 JavaCalls::call(&result, m, &args, CHECK_false); 1148 return (result.get_jboolean() != 0); 1149 } 1150 } 1151 return true; 1152 } 1153 1154 // Create an AccessControlContext with a protection domain with null codesource 1155 // and null permissions - which gives no permissions. 1156 oop create_dummy_access_control_context(TRAPS) { 1157 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass()); 1158 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1159 // Call constructor ProtectionDomain(null, null); 1160 JavaValue result(T_VOID); 1161 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass), 1162 vmSymbols::object_initializer_name(), 1163 vmSymbols::codesource_permissioncollection_signature(), 1164 Handle(), Handle(), CHECK_NULL); 1165 1166 // new ProtectionDomain[] {pd}; 1167 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1168 context->obj_at_put(0, obj()); 1169 1170 // new AccessControlContext(new ProtectionDomain[] {pd}) 1171 objArrayHandle h_context(THREAD, context); 1172 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1173 return acc; 1174 } 1175 1176 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1177 JVMWrapper("JVM_DoPrivileged"); 1178 1179 if (action == NULL) { 1180 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1181 } 1182 1183 // Compute the frame initiating the do privileged operation and setup the privileged stack 1184 vframeStream vfst(thread); 1185 vfst.security_get_caller_frame(1); 1186 1187 if (vfst.at_end()) { 1188 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1189 } 1190 1191 Method* method = vfst.method(); 1192 instanceKlassHandle klass (THREAD, method->method_holder()); 1193 1194 // Check that action object understands "Object run()" 1195 Handle h_context; 1196 if (context != NULL) { 1197 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1198 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1199 if (!authorized) { 1200 // Create an unprivileged access control object and call it's run function 1201 // instead. 1202 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1203 h_context = Handle(THREAD, noprivs); 1204 } 1205 } 1206 1207 // Check that action object understands "Object run()" 1208 Handle object (THREAD, JNIHandles::resolve(action)); 1209 1210 // get run() method 1211 Method* m_oop = object->klass()->uncached_lookup_method( 1212 vmSymbols::run_method_name(), 1213 vmSymbols::void_object_signature(), 1214 Klass::find_overpass); 1215 methodHandle m (THREAD, m_oop); 1216 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { 1217 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1218 } 1219 1220 // Stack allocated list of privileged stack elements 1221 PrivilegedElement pi; 1222 if (!vfst.at_end()) { 1223 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1224 thread->set_privileged_stack_top(&pi); 1225 } 1226 1227 1228 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1229 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1230 Handle pending_exception; 1231 JavaValue result(T_OBJECT); 1232 JavaCallArguments args(object); 1233 JavaCalls::call(&result, m, &args, THREAD); 1234 1235 // done with action, remove ourselves from the list 1236 if (!vfst.at_end()) { 1237 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1238 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1239 } 1240 1241 if (HAS_PENDING_EXCEPTION) { 1242 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1243 CLEAR_PENDING_EXCEPTION; 1244 // JVMTI has already reported the pending exception 1245 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1246 if (THREAD->is_Java_thread()) { 1247 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1248 } 1249 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1250 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1251 // Throw a java.security.PrivilegedActionException(Exception e) exception 1252 JavaCallArguments args(pending_exception); 1253 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1254 vmSymbols::exception_void_signature(), 1255 &args); 1256 } 1257 } 1258 1259 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1260 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1261 JVM_END 1262 1263 1264 // Returns the inherited_access_control_context field of the running thread. 1265 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1266 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1267 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1268 return JNIHandles::make_local(env, result); 1269 JVM_END 1270 1271 class RegisterArrayForGC { 1272 private: 1273 JavaThread *_thread; 1274 public: 1275 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1276 _thread = thread; 1277 _thread->register_array_for_gc(array); 1278 } 1279 1280 ~RegisterArrayForGC() { 1281 _thread->register_array_for_gc(NULL); 1282 } 1283 }; 1284 1285 1286 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1287 JVMWrapper("JVM_GetStackAccessControlContext"); 1288 if (!UsePrivilegedStack) return NULL; 1289 1290 ResourceMark rm(THREAD); 1291 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1292 JvmtiVMObjectAllocEventCollector oam; 1293 1294 // count the protection domains on the execution stack. We collapse 1295 // duplicate consecutive protection domains into a single one, as 1296 // well as stopping when we hit a privileged frame. 1297 1298 // Use vframeStream to iterate through Java frames 1299 vframeStream vfst(thread); 1300 1301 oop previous_protection_domain = NULL; 1302 Handle privileged_context(thread, NULL); 1303 bool is_privileged = false; 1304 oop protection_domain = NULL; 1305 1306 for(; !vfst.at_end(); vfst.next()) { 1307 // get method of frame 1308 Method* method = vfst.method(); 1309 intptr_t* frame_id = vfst.frame_id(); 1310 1311 // check the privileged frames to see if we have a match 1312 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1313 // this frame is privileged 1314 is_privileged = true; 1315 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1316 protection_domain = thread->privileged_stack_top()->protection_domain(); 1317 } else { 1318 protection_domain = method->method_holder()->protection_domain(); 1319 } 1320 1321 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1322 local_array->push(protection_domain); 1323 previous_protection_domain = protection_domain; 1324 } 1325 1326 if (is_privileged) break; 1327 } 1328 1329 1330 // either all the domains on the stack were system domains, or 1331 // we had a privileged system domain 1332 if (local_array->is_empty()) { 1333 if (is_privileged && privileged_context.is_null()) return NULL; 1334 1335 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1336 return JNIHandles::make_local(env, result); 1337 } 1338 1339 // the resource area must be registered in case of a gc 1340 RegisterArrayForGC ragc(thread, local_array); 1341 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1342 local_array->length(), CHECK_NULL); 1343 objArrayHandle h_context(thread, context); 1344 for (int index = 0; index < local_array->length(); index++) { 1345 h_context->obj_at_put(index, local_array->at(index)); 1346 } 1347 1348 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1349 1350 return JNIHandles::make_local(env, result); 1351 JVM_END 1352 1353 1354 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1355 JVMWrapper("JVM_IsArrayClass"); 1356 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1357 return (k != NULL) && k->oop_is_array() ? true : false; 1358 JVM_END 1359 1360 1361 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1362 JVMWrapper("JVM_IsPrimitiveClass"); 1363 oop mirror = JNIHandles::resolve_non_null(cls); 1364 return (jboolean) java_lang_Class::is_primitive(mirror); 1365 JVM_END 1366 1367 1368 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1369 JVMWrapper("JVM_GetClassModifiers"); 1370 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1371 // Primitive type 1372 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1373 } 1374 1375 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1376 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1377 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1378 return k->modifier_flags(); 1379 JVM_END 1380 1381 1382 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1383 1384 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1385 JvmtiVMObjectAllocEventCollector oam; 1386 // ofClass is a reference to a java_lang_Class object. The mirror object 1387 // of an InstanceKlass 1388 1389 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1390 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1391 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1392 return (jobjectArray)JNIHandles::make_local(env, result); 1393 } 1394 1395 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1396 InnerClassesIterator iter(k); 1397 1398 if (iter.length() == 0) { 1399 // Neither an inner nor outer class 1400 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1401 return (jobjectArray)JNIHandles::make_local(env, result); 1402 } 1403 1404 // find inner class info 1405 constantPoolHandle cp(thread, k->constants()); 1406 int length = iter.length(); 1407 1408 // Allocate temp. result array 1409 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1410 objArrayHandle result (THREAD, r); 1411 int members = 0; 1412 1413 for (; !iter.done(); iter.next()) { 1414 int ioff = iter.inner_class_info_index(); 1415 int ooff = iter.outer_class_info_index(); 1416 1417 if (ioff != 0 && ooff != 0) { 1418 // Check to see if the name matches the class we're looking for 1419 // before attempting to find the class. 1420 if (cp->klass_name_at_matches(k, ooff)) { 1421 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1422 if (outer_klass == k()) { 1423 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1424 instanceKlassHandle inner_klass (THREAD, ik); 1425 1426 // Throws an exception if outer klass has not declared k as 1427 // an inner klass 1428 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1429 1430 result->obj_at_put(members, inner_klass->java_mirror()); 1431 members++; 1432 } 1433 } 1434 } 1435 } 1436 1437 if (members != length) { 1438 // Return array of right length 1439 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1440 for(int i = 0; i < members; i++) { 1441 res->obj_at_put(i, result->obj_at(i)); 1442 } 1443 return (jobjectArray)JNIHandles::make_local(env, res); 1444 } 1445 1446 return (jobjectArray)JNIHandles::make_local(env, result()); 1447 JVM_END 1448 1449 1450 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1451 { 1452 // ofClass is a reference to a java_lang_Class object. 1453 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1454 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1455 return NULL; 1456 } 1457 1458 bool inner_is_member = false; 1459 Klass* outer_klass 1460 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1461 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1462 if (outer_klass == NULL) return NULL; // already a top-level class 1463 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1464 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1465 } 1466 JVM_END 1467 1468 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1469 { 1470 oop mirror = JNIHandles::resolve_non_null(cls); 1471 if (java_lang_Class::is_primitive(mirror) || 1472 !java_lang_Class::as_Klass(mirror)->oop_is_instance()) { 1473 return NULL; 1474 } 1475 instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror))); 1476 int ooff = 0, noff = 0; 1477 if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) { 1478 if (noff != 0) { 1479 constantPoolHandle i_cp(thread, k->constants()); 1480 Symbol* name = i_cp->symbol_at(noff); 1481 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1482 return (jstring) JNIHandles::make_local(env, str()); 1483 } 1484 } 1485 return NULL; 1486 } 1487 JVM_END 1488 1489 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1490 assert (cls != NULL, "illegal class"); 1491 JVMWrapper("JVM_GetClassSignature"); 1492 JvmtiVMObjectAllocEventCollector oam; 1493 ResourceMark rm(THREAD); 1494 // Return null for arrays and primatives 1495 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1496 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1497 if (k->oop_is_instance()) { 1498 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1499 if (sym == NULL) return NULL; 1500 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1501 return (jstring) JNIHandles::make_local(env, str()); 1502 } 1503 } 1504 return NULL; 1505 JVM_END 1506 1507 1508 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1509 assert (cls != NULL, "illegal class"); 1510 JVMWrapper("JVM_GetClassAnnotations"); 1511 1512 // Return null for arrays and primitives 1513 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1514 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1515 if (k->oop_is_instance()) { 1516 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1517 return (jbyteArray) JNIHandles::make_local(env, a); 1518 } 1519 } 1520 return NULL; 1521 JVM_END 1522 1523 1524 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1525 // some of this code was adapted from from jni_FromReflectedField 1526 1527 oop reflected = JNIHandles::resolve_non_null(field); 1528 oop mirror = java_lang_reflect_Field::clazz(reflected); 1529 Klass* k = java_lang_Class::as_Klass(mirror); 1530 int slot = java_lang_reflect_Field::slot(reflected); 1531 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1532 1533 KlassHandle kh(THREAD, k); 1534 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot); 1535 1536 if (modifiers & JVM_ACC_STATIC) { 1537 // for static fields we only look in the current class 1538 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) { 1539 assert(false, "cannot find static field"); 1540 return false; 1541 } 1542 } else { 1543 // for instance fields we start with the current class and work 1544 // our way up through the superclass chain 1545 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) { 1546 assert(false, "cannot find instance field"); 1547 return false; 1548 } 1549 } 1550 return true; 1551 } 1552 1553 static Method* jvm_get_method_common(jobject method) { 1554 // some of this code was adapted from from jni_FromReflectedMethod 1555 1556 oop reflected = JNIHandles::resolve_non_null(method); 1557 oop mirror = NULL; 1558 int slot = 0; 1559 1560 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1561 mirror = java_lang_reflect_Constructor::clazz(reflected); 1562 slot = java_lang_reflect_Constructor::slot(reflected); 1563 } else { 1564 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1565 "wrong type"); 1566 mirror = java_lang_reflect_Method::clazz(reflected); 1567 slot = java_lang_reflect_Method::slot(reflected); 1568 } 1569 Klass* k = java_lang_Class::as_Klass(mirror); 1570 1571 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1572 assert(m != NULL, "cannot find method"); 1573 return m; // caller has to deal with NULL in product mode 1574 } 1575 1576 /* Type use annotations support (JDK 1.8) */ 1577 1578 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1579 assert (cls != NULL, "illegal class"); 1580 JVMWrapper("JVM_GetClassTypeAnnotations"); 1581 ResourceMark rm(THREAD); 1582 // Return null for arrays and primitives 1583 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1584 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1585 if (k->oop_is_instance()) { 1586 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1587 if (type_annotations != NULL) { 1588 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1589 return (jbyteArray) JNIHandles::make_local(env, a); 1590 } 1591 } 1592 } 1593 return NULL; 1594 JVM_END 1595 1596 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1597 assert (method != NULL, "illegal method"); 1598 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1599 1600 // method is a handle to a java.lang.reflect.Method object 1601 Method* m = jvm_get_method_common(method); 1602 if (m == NULL) { 1603 return NULL; 1604 } 1605 1606 AnnotationArray* type_annotations = m->type_annotations(); 1607 if (type_annotations != NULL) { 1608 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1609 return (jbyteArray) JNIHandles::make_local(env, a); 1610 } 1611 1612 return NULL; 1613 JVM_END 1614 1615 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1616 assert (field != NULL, "illegal field"); 1617 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1618 1619 fieldDescriptor fd; 1620 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1621 if (!gotFd) { 1622 return NULL; 1623 } 1624 1625 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1626 JVM_END 1627 1628 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { 1629 if (!cp->is_within_bounds(index)) { 1630 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1631 } 1632 } 1633 1634 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1635 { 1636 JVMWrapper("JVM_GetMethodParameters"); 1637 // method is a handle to a java.lang.reflect.Method object 1638 Method* method_ptr = jvm_get_method_common(method); 1639 methodHandle mh (THREAD, method_ptr); 1640 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1641 const int num_params = mh->method_parameters_length(); 1642 1643 if (num_params < 0) { 1644 // A -1 return value from method_parameters_length means there is no 1645 // parameter data. Return null to indicate this to the reflection 1646 // API. 1647 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1648 return (jobjectArray)NULL; 1649 } else { 1650 // Otherwise, we return something up to reflection, even if it is 1651 // a zero-length array. Why? Because in some cases this can 1652 // trigger a MalformedParametersException. 1653 1654 // make sure all the symbols are properly formatted 1655 for (int i = 0; i < num_params; i++) { 1656 MethodParametersElement* params = mh->method_parameters_start(); 1657 int index = params[i].name_cp_index; 1658 bounds_check(mh->constants(), index, CHECK_NULL); 1659 1660 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1661 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1662 "Wrong type at constant pool index"); 1663 } 1664 1665 } 1666 1667 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1668 objArrayHandle result (THREAD, result_oop); 1669 1670 for (int i = 0; i < num_params; i++) { 1671 MethodParametersElement* params = mh->method_parameters_start(); 1672 // For a 0 index, give a NULL symbol 1673 Symbol* sym = 0 != params[i].name_cp_index ? 1674 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1675 int flags = params[i].flags; 1676 oop param = Reflection::new_parameter(reflected_method, i, sym, 1677 flags, CHECK_NULL); 1678 result->obj_at_put(i, param); 1679 } 1680 return (jobjectArray)JNIHandles::make_local(env, result()); 1681 } 1682 } 1683 JVM_END 1684 1685 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1686 1687 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1688 { 1689 JVMWrapper("JVM_GetClassDeclaredFields"); 1690 JvmtiVMObjectAllocEventCollector oam; 1691 1692 // Exclude primitive types and array types 1693 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1694 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 1695 // Return empty array 1696 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1697 return (jobjectArray) JNIHandles::make_local(env, res); 1698 } 1699 1700 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1701 constantPoolHandle cp(THREAD, k->constants()); 1702 1703 // Ensure class is linked 1704 k->link_class(CHECK_NULL); 1705 1706 // 4496456 We need to filter out java.lang.Throwable.backtrace 1707 bool skip_backtrace = false; 1708 1709 // Allocate result 1710 int num_fields; 1711 1712 if (publicOnly) { 1713 num_fields = 0; 1714 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) { 1715 if (fs.access_flags().is_public()) ++num_fields; 1716 } 1717 } else { 1718 num_fields = k->java_fields_count(); 1719 1720 if (k() == SystemDictionary::Throwable_klass()) { 1721 num_fields--; 1722 skip_backtrace = true; 1723 } 1724 } 1725 1726 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1727 objArrayHandle result (THREAD, r); 1728 1729 int out_idx = 0; 1730 fieldDescriptor fd; 1731 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1732 if (skip_backtrace) { 1733 // 4496456 skip java.lang.Throwable.backtrace 1734 int offset = fs.offset(); 1735 if (offset == java_lang_Throwable::get_backtrace_offset()) continue; 1736 } 1737 1738 if (!publicOnly || fs.access_flags().is_public()) { 1739 fd.reinitialize(k(), fs.index()); 1740 oop field = Reflection::new_field(&fd, CHECK_NULL); 1741 result->obj_at_put(out_idx, field); 1742 ++out_idx; 1743 } 1744 } 1745 assert(out_idx == num_fields, "just checking"); 1746 return (jobjectArray) JNIHandles::make_local(env, result()); 1747 } 1748 JVM_END 1749 1750 static bool select_method(methodHandle method, bool want_constructor) { 1751 if (want_constructor) { 1752 return (method->is_initializer() && !method->is_static()); 1753 } else { 1754 return (!method->is_initializer() && !method->is_overpass()); 1755 } 1756 } 1757 1758 static jobjectArray get_class_declared_methods_helper( 1759 JNIEnv *env, 1760 jclass ofClass, jboolean publicOnly, 1761 bool want_constructor, 1762 Klass* klass, TRAPS) { 1763 1764 JvmtiVMObjectAllocEventCollector oam; 1765 1766 // Exclude primitive types and array types 1767 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1768 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 1769 // Return empty array 1770 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1771 return (jobjectArray) JNIHandles::make_local(env, res); 1772 } 1773 1774 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1775 1776 // Ensure class is linked 1777 k->link_class(CHECK_NULL); 1778 1779 Array<Method*>* methods = k->methods(); 1780 int methods_length = methods->length(); 1781 1782 // Save original method_idnum in case of redefinition, which can change 1783 // the idnum of obsolete methods. The new method will have the same idnum 1784 // but if we refresh the methods array, the counts will be wrong. 1785 ResourceMark rm(THREAD); 1786 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1787 int num_methods = 0; 1788 1789 for (int i = 0; i < methods_length; i++) { 1790 methodHandle method(THREAD, methods->at(i)); 1791 if (select_method(method, want_constructor)) { 1792 if (!publicOnly || method->is_public()) { 1793 idnums->push(method->method_idnum()); 1794 ++num_methods; 1795 } 1796 } 1797 } 1798 1799 // Allocate result 1800 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1801 objArrayHandle result (THREAD, r); 1802 1803 // Now just put the methods that we selected above, but go by their idnum 1804 // in case of redefinition. The methods can be redefined at any safepoint, 1805 // so above when allocating the oop array and below when creating reflect 1806 // objects. 1807 for (int i = 0; i < num_methods; i++) { 1808 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1809 if (method.is_null()) { 1810 // Method may have been deleted and seems this API can handle null 1811 // Otherwise should probably put a method that throws NSME 1812 result->obj_at_put(i, NULL); 1813 } else { 1814 oop m; 1815 if (want_constructor) { 1816 m = Reflection::new_constructor(method, CHECK_NULL); 1817 } else { 1818 m = Reflection::new_method(method, false, CHECK_NULL); 1819 } 1820 result->obj_at_put(i, m); 1821 } 1822 } 1823 1824 return (jobjectArray) JNIHandles::make_local(env, result()); 1825 } 1826 1827 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1828 { 1829 JVMWrapper("JVM_GetClassDeclaredMethods"); 1830 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1831 /*want_constructor*/ false, 1832 SystemDictionary::reflect_Method_klass(), THREAD); 1833 } 1834 JVM_END 1835 1836 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1837 { 1838 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1839 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1840 /*want_constructor*/ true, 1841 SystemDictionary::reflect_Constructor_klass(), THREAD); 1842 } 1843 JVM_END 1844 1845 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1846 { 1847 JVMWrapper("JVM_GetClassAccessFlags"); 1848 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1849 // Primitive type 1850 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1851 } 1852 1853 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1854 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1855 } 1856 JVM_END 1857 1858 1859 // Constant pool access ////////////////////////////////////////////////////////// 1860 1861 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1862 { 1863 JVMWrapper("JVM_GetClassConstantPool"); 1864 JvmtiVMObjectAllocEventCollector oam; 1865 1866 // Return null for primitives and arrays 1867 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1868 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1869 if (k->oop_is_instance()) { 1870 instanceKlassHandle k_h(THREAD, k); 1871 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL); 1872 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1873 return JNIHandles::make_local(jcp()); 1874 } 1875 } 1876 return NULL; 1877 } 1878 JVM_END 1879 1880 1881 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1882 { 1883 JVMWrapper("JVM_ConstantPoolGetSize"); 1884 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1885 return cp->length(); 1886 } 1887 JVM_END 1888 1889 1890 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1891 { 1892 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1893 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1894 bounds_check(cp, index, CHECK_NULL); 1895 constantTag tag = cp->tag_at(index); 1896 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1897 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1898 } 1899 Klass* k = cp->klass_at(index, CHECK_NULL); 1900 return (jclass) JNIHandles::make_local(k->java_mirror()); 1901 } 1902 JVM_END 1903 1904 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1905 { 1906 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1907 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1908 bounds_check(cp, index, CHECK_NULL); 1909 constantTag tag = cp->tag_at(index); 1910 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1911 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1912 } 1913 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1914 if (k == NULL) return NULL; 1915 return (jclass) JNIHandles::make_local(k->java_mirror()); 1916 } 1917 JVM_END 1918 1919 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1920 constantTag tag = cp->tag_at(index); 1921 if (!tag.is_method() && !tag.is_interface_method()) { 1922 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1923 } 1924 int klass_ref = cp->uncached_klass_ref_index_at(index); 1925 Klass* k_o; 1926 if (force_resolution) { 1927 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1928 } else { 1929 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1930 if (k_o == NULL) return NULL; 1931 } 1932 instanceKlassHandle k(THREAD, k_o); 1933 Symbol* name = cp->uncached_name_ref_at(index); 1934 Symbol* sig = cp->uncached_signature_ref_at(index); 1935 methodHandle m (THREAD, k->find_method(name, sig)); 1936 if (m.is_null()) { 1937 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1938 } 1939 oop method; 1940 if (!m->is_initializer() || m->is_static()) { 1941 method = Reflection::new_method(m, true, CHECK_NULL); 1942 } else { 1943 method = Reflection::new_constructor(m, CHECK_NULL); 1944 } 1945 return JNIHandles::make_local(method); 1946 } 1947 1948 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1949 { 1950 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1951 JvmtiVMObjectAllocEventCollector oam; 1952 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1953 bounds_check(cp, index, CHECK_NULL); 1954 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1955 return res; 1956 } 1957 JVM_END 1958 1959 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1960 { 1961 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 1962 JvmtiVMObjectAllocEventCollector oam; 1963 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1964 bounds_check(cp, index, CHECK_NULL); 1965 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 1966 return res; 1967 } 1968 JVM_END 1969 1970 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1971 constantTag tag = cp->tag_at(index); 1972 if (!tag.is_field()) { 1973 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1974 } 1975 int klass_ref = cp->uncached_klass_ref_index_at(index); 1976 Klass* k_o; 1977 if (force_resolution) { 1978 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1979 } else { 1980 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1981 if (k_o == NULL) return NULL; 1982 } 1983 instanceKlassHandle k(THREAD, k_o); 1984 Symbol* name = cp->uncached_name_ref_at(index); 1985 Symbol* sig = cp->uncached_signature_ref_at(index); 1986 fieldDescriptor fd; 1987 Klass* target_klass = k->find_field(name, sig, &fd); 1988 if (target_klass == NULL) { 1989 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 1990 } 1991 oop field = Reflection::new_field(&fd, CHECK_NULL); 1992 return JNIHandles::make_local(field); 1993 } 1994 1995 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 1996 { 1997 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 1998 JvmtiVMObjectAllocEventCollector oam; 1999 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2000 bounds_check(cp, index, CHECK_NULL); 2001 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2002 return res; 2003 } 2004 JVM_END 2005 2006 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2007 { 2008 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2009 JvmtiVMObjectAllocEventCollector oam; 2010 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2011 bounds_check(cp, index, CHECK_NULL); 2012 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2013 return res; 2014 } 2015 JVM_END 2016 2017 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2018 { 2019 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2020 JvmtiVMObjectAllocEventCollector oam; 2021 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2022 bounds_check(cp, index, CHECK_NULL); 2023 constantTag tag = cp->tag_at(index); 2024 if (!tag.is_field_or_method()) { 2025 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2026 } 2027 int klass_ref = cp->uncached_klass_ref_index_at(index); 2028 Symbol* klass_name = cp->klass_name_at(klass_ref); 2029 Symbol* member_name = cp->uncached_name_ref_at(index); 2030 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2031 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2032 objArrayHandle dest(THREAD, dest_o); 2033 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2034 dest->obj_at_put(0, str()); 2035 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2036 dest->obj_at_put(1, str()); 2037 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2038 dest->obj_at_put(2, str()); 2039 return (jobjectArray) JNIHandles::make_local(dest()); 2040 } 2041 JVM_END 2042 2043 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2044 { 2045 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2046 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2047 bounds_check(cp, index, CHECK_0); 2048 constantTag tag = cp->tag_at(index); 2049 if (!tag.is_int()) { 2050 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2051 } 2052 return cp->int_at(index); 2053 } 2054 JVM_END 2055 2056 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2057 { 2058 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2059 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2060 bounds_check(cp, index, CHECK_(0L)); 2061 constantTag tag = cp->tag_at(index); 2062 if (!tag.is_long()) { 2063 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2064 } 2065 return cp->long_at(index); 2066 } 2067 JVM_END 2068 2069 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2070 { 2071 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2072 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2073 bounds_check(cp, index, CHECK_(0.0f)); 2074 constantTag tag = cp->tag_at(index); 2075 if (!tag.is_float()) { 2076 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2077 } 2078 return cp->float_at(index); 2079 } 2080 JVM_END 2081 2082 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2083 { 2084 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2085 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2086 bounds_check(cp, index, CHECK_(0.0)); 2087 constantTag tag = cp->tag_at(index); 2088 if (!tag.is_double()) { 2089 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2090 } 2091 return cp->double_at(index); 2092 } 2093 JVM_END 2094 2095 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2096 { 2097 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2098 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2099 bounds_check(cp, index, CHECK_NULL); 2100 constantTag tag = cp->tag_at(index); 2101 if (!tag.is_string()) { 2102 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2103 } 2104 oop str = cp->string_at(index, CHECK_NULL); 2105 return (jstring) JNIHandles::make_local(str); 2106 } 2107 JVM_END 2108 2109 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2110 { 2111 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2112 JvmtiVMObjectAllocEventCollector oam; 2113 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2114 bounds_check(cp, index, CHECK_NULL); 2115 constantTag tag = cp->tag_at(index); 2116 if (!tag.is_symbol()) { 2117 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2118 } 2119 Symbol* sym = cp->symbol_at(index); 2120 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2121 return (jstring) JNIHandles::make_local(str()); 2122 } 2123 JVM_END 2124 2125 2126 // Assertion support. ////////////////////////////////////////////////////////// 2127 2128 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2129 JVMWrapper("JVM_DesiredAssertionStatus"); 2130 assert(cls != NULL, "bad class"); 2131 2132 oop r = JNIHandles::resolve(cls); 2133 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2134 if (java_lang_Class::is_primitive(r)) return false; 2135 2136 Klass* k = java_lang_Class::as_Klass(r); 2137 assert(k->oop_is_instance(), "must be an instance klass"); 2138 if (! k->oop_is_instance()) return false; 2139 2140 ResourceMark rm(THREAD); 2141 const char* name = k->name()->as_C_string(); 2142 bool system_class = k->class_loader() == NULL; 2143 return JavaAssertions::enabled(name, system_class); 2144 2145 JVM_END 2146 2147 2148 // Return a new AssertionStatusDirectives object with the fields filled in with 2149 // command-line assertion arguments (i.e., -ea, -da). 2150 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2151 JVMWrapper("JVM_AssertionStatusDirectives"); 2152 JvmtiVMObjectAllocEventCollector oam; 2153 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2154 return JNIHandles::make_local(env, asd); 2155 JVM_END 2156 2157 // Verification //////////////////////////////////////////////////////////////////////////////// 2158 2159 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2160 2161 // RedefineClasses support: bug 6214132 caused verification to fail. 2162 // All functions from this section should call the jvmtiThreadSate function: 2163 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2164 // The function returns a Klass* of the _scratch_class if the verifier 2165 // was invoked in the middle of the class redefinition. 2166 // Otherwise it returns its argument value which is the _the_class Klass*. 2167 // Please, refer to the description in the jvmtiThreadSate.hpp. 2168 2169 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2170 JVMWrapper("JVM_GetClassNameUTF"); 2171 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2172 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2173 return k->name()->as_utf8(); 2174 JVM_END 2175 2176 2177 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2178 JVMWrapper("JVM_GetClassCPTypes"); 2179 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2180 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2181 // types will have length zero if this is not an InstanceKlass 2182 // (length is determined by call to JVM_GetClassCPEntriesCount) 2183 if (k->oop_is_instance()) { 2184 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2185 for (int index = cp->length() - 1; index >= 0; index--) { 2186 constantTag tag = cp->tag_at(index); 2187 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2188 } 2189 } 2190 JVM_END 2191 2192 2193 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2194 JVMWrapper("JVM_GetClassCPEntriesCount"); 2195 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2196 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2197 if (!k->oop_is_instance()) 2198 return 0; 2199 return InstanceKlass::cast(k)->constants()->length(); 2200 JVM_END 2201 2202 2203 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2204 JVMWrapper("JVM_GetClassFieldsCount"); 2205 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2206 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2207 if (!k->oop_is_instance()) 2208 return 0; 2209 return InstanceKlass::cast(k)->java_fields_count(); 2210 JVM_END 2211 2212 2213 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2214 JVMWrapper("JVM_GetClassMethodsCount"); 2215 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2216 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2217 if (!k->oop_is_instance()) 2218 return 0; 2219 return InstanceKlass::cast(k)->methods()->length(); 2220 JVM_END 2221 2222 2223 // The following methods, used for the verifier, are never called with 2224 // array klasses, so a direct cast to InstanceKlass is safe. 2225 // Typically, these methods are called in a loop with bounds determined 2226 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2227 // zero for arrays. 2228 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2229 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2230 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2231 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2232 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2233 int length = method->checked_exceptions_length(); 2234 if (length > 0) { 2235 CheckedExceptionElement* table= method->checked_exceptions_start(); 2236 for (int i = 0; i < length; i++) { 2237 exceptions[i] = table[i].class_cp_index; 2238 } 2239 } 2240 JVM_END 2241 2242 2243 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2244 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2245 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2246 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2247 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2248 return method->checked_exceptions_length(); 2249 JVM_END 2250 2251 2252 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2253 JVMWrapper("JVM_GetMethodIxByteCode"); 2254 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2255 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2256 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2257 memcpy(code, method->code_base(), method->code_size()); 2258 JVM_END 2259 2260 2261 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2262 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2263 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2264 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2265 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2266 return method->code_size(); 2267 JVM_END 2268 2269 2270 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2271 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2272 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2273 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2274 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2275 ExceptionTable extable(method); 2276 entry->start_pc = extable.start_pc(entry_index); 2277 entry->end_pc = extable.end_pc(entry_index); 2278 entry->handler_pc = extable.handler_pc(entry_index); 2279 entry->catchType = extable.catch_type_index(entry_index); 2280 JVM_END 2281 2282 2283 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2284 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2285 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2286 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2287 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2288 return method->exception_table_length(); 2289 JVM_END 2290 2291 2292 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2293 JVMWrapper("JVM_GetMethodIxModifiers"); 2294 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2295 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2296 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2297 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2298 JVM_END 2299 2300 2301 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2302 JVMWrapper("JVM_GetFieldIxModifiers"); 2303 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2304 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2305 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2306 JVM_END 2307 2308 2309 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2310 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2311 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2312 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2313 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2314 return method->max_locals(); 2315 JVM_END 2316 2317 2318 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2319 JVMWrapper("JVM_GetMethodIxArgsSize"); 2320 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2321 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2322 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2323 return method->size_of_parameters(); 2324 JVM_END 2325 2326 2327 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2328 JVMWrapper("JVM_GetMethodIxMaxStack"); 2329 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2330 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2331 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2332 return method->verifier_max_stack(); 2333 JVM_END 2334 2335 2336 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2337 JVMWrapper("JVM_IsConstructorIx"); 2338 ResourceMark rm(THREAD); 2339 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2340 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2341 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2342 return method->name() == vmSymbols::object_initializer_name(); 2343 JVM_END 2344 2345 2346 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2347 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2348 ResourceMark rm(THREAD); 2349 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2350 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2351 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2352 return method->is_overpass(); 2353 JVM_END 2354 2355 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2356 JVMWrapper("JVM_GetMethodIxIxUTF"); 2357 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2358 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2359 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2360 return method->name()->as_utf8(); 2361 JVM_END 2362 2363 2364 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2365 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2366 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2367 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2368 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2369 return method->signature()->as_utf8(); 2370 JVM_END 2371 2372 /** 2373 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2374 * read entries in the constant pool. Since the old verifier always 2375 * works on a copy of the code, it will not see any rewriting that 2376 * may possibly occur in the middle of verification. So it is important 2377 * that nothing it calls tries to use the cpCache instead of the raw 2378 * constant pool, so we must use cp->uncached_x methods when appropriate. 2379 */ 2380 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2381 JVMWrapper("JVM_GetCPFieldNameUTF"); 2382 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2383 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2384 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2385 switch (cp->tag_at(cp_index).value()) { 2386 case JVM_CONSTANT_Fieldref: 2387 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2388 default: 2389 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2390 } 2391 ShouldNotReachHere(); 2392 return NULL; 2393 JVM_END 2394 2395 2396 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2397 JVMWrapper("JVM_GetCPMethodNameUTF"); 2398 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2399 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2400 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2401 switch (cp->tag_at(cp_index).value()) { 2402 case JVM_CONSTANT_InterfaceMethodref: 2403 case JVM_CONSTANT_Methodref: 2404 case JVM_CONSTANT_NameAndType: // for invokedynamic 2405 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2406 default: 2407 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2408 } 2409 ShouldNotReachHere(); 2410 return NULL; 2411 JVM_END 2412 2413 2414 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2415 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2416 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2417 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2418 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2419 switch (cp->tag_at(cp_index).value()) { 2420 case JVM_CONSTANT_InterfaceMethodref: 2421 case JVM_CONSTANT_Methodref: 2422 case JVM_CONSTANT_NameAndType: // for invokedynamic 2423 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2424 default: 2425 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2426 } 2427 ShouldNotReachHere(); 2428 return NULL; 2429 JVM_END 2430 2431 2432 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2433 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2434 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2435 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2436 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2437 switch (cp->tag_at(cp_index).value()) { 2438 case JVM_CONSTANT_Fieldref: 2439 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2440 default: 2441 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2442 } 2443 ShouldNotReachHere(); 2444 return NULL; 2445 JVM_END 2446 2447 2448 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2449 JVMWrapper("JVM_GetCPClassNameUTF"); 2450 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2451 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2452 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2453 Symbol* classname = cp->klass_name_at(cp_index); 2454 return classname->as_utf8(); 2455 JVM_END 2456 2457 2458 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2459 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2460 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2461 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2462 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2463 switch (cp->tag_at(cp_index).value()) { 2464 case JVM_CONSTANT_Fieldref: { 2465 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2466 Symbol* classname = cp->klass_name_at(class_index); 2467 return classname->as_utf8(); 2468 } 2469 default: 2470 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2471 } 2472 ShouldNotReachHere(); 2473 return NULL; 2474 JVM_END 2475 2476 2477 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2478 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2479 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2480 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2481 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2482 switch (cp->tag_at(cp_index).value()) { 2483 case JVM_CONSTANT_Methodref: 2484 case JVM_CONSTANT_InterfaceMethodref: { 2485 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2486 Symbol* classname = cp->klass_name_at(class_index); 2487 return classname->as_utf8(); 2488 } 2489 default: 2490 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2491 } 2492 ShouldNotReachHere(); 2493 return NULL; 2494 JVM_END 2495 2496 2497 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2498 JVMWrapper("JVM_GetCPFieldModifiers"); 2499 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2500 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2501 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2502 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2503 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2504 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2505 switch (cp->tag_at(cp_index).value()) { 2506 case JVM_CONSTANT_Fieldref: { 2507 Symbol* name = cp->uncached_name_ref_at(cp_index); 2508 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2509 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) { 2510 if (fs.name() == name && fs.signature() == signature) { 2511 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2512 } 2513 } 2514 return -1; 2515 } 2516 default: 2517 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2518 } 2519 ShouldNotReachHere(); 2520 return 0; 2521 JVM_END 2522 2523 2524 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2525 JVMWrapper("JVM_GetCPMethodModifiers"); 2526 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2527 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2528 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2529 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2530 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2531 switch (cp->tag_at(cp_index).value()) { 2532 case JVM_CONSTANT_Methodref: 2533 case JVM_CONSTANT_InterfaceMethodref: { 2534 Symbol* name = cp->uncached_name_ref_at(cp_index); 2535 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2536 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2537 int methods_count = methods->length(); 2538 for (int i = 0; i < methods_count; i++) { 2539 Method* method = methods->at(i); 2540 if (method->name() == name && method->signature() == signature) { 2541 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2542 } 2543 } 2544 return -1; 2545 } 2546 default: 2547 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2548 } 2549 ShouldNotReachHere(); 2550 return 0; 2551 JVM_END 2552 2553 2554 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2555 2556 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2557 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2558 JVM_END 2559 2560 2561 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2562 JVMWrapper("JVM_IsSameClassPackage"); 2563 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2564 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2565 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2566 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2567 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2568 JVM_END 2569 2570 // Printing support ////////////////////////////////////////////////// 2571 extern "C" { 2572 2573 ATTRIBUTE_PRINTF(3, 0) 2574 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2575 // see bug 4399518, 4417214 2576 if ((intptr_t)count <= 0) return -1; 2577 2578 int result = vsnprintf(str, count, fmt, args); 2579 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2580 // characters which would have been written had the buffer been large 2581 // enough; on Windows, it returns -1. We handle both cases here and 2582 // always return -1, and perform null termination. 2583 if ((result > 0 && (size_t)result >= count) || result == -1) { 2584 str[count - 1] = '\0'; 2585 result = -1; 2586 } 2587 2588 return result; 2589 } 2590 2591 ATTRIBUTE_PRINTF(3, 0) 2592 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2593 va_list args; 2594 int len; 2595 va_start(args, fmt); 2596 len = jio_vsnprintf(str, count, fmt, args); 2597 va_end(args); 2598 return len; 2599 } 2600 2601 ATTRIBUTE_PRINTF(2,3) 2602 int jio_fprintf(FILE* f, const char *fmt, ...) { 2603 int len; 2604 va_list args; 2605 va_start(args, fmt); 2606 len = jio_vfprintf(f, fmt, args); 2607 va_end(args); 2608 return len; 2609 } 2610 2611 ATTRIBUTE_PRINTF(2, 0) 2612 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2613 if (Arguments::vfprintf_hook() != NULL) { 2614 return Arguments::vfprintf_hook()(f, fmt, args); 2615 } else { 2616 return vfprintf(f, fmt, args); 2617 } 2618 } 2619 2620 ATTRIBUTE_PRINTF(1, 2) 2621 JNIEXPORT int jio_printf(const char *fmt, ...) { 2622 int len; 2623 va_list args; 2624 va_start(args, fmt); 2625 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2626 va_end(args); 2627 return len; 2628 } 2629 2630 2631 // HotSpot specific jio method 2632 void jio_print(const char* s) { 2633 // Try to make this function as atomic as possible. 2634 if (Arguments::vfprintf_hook() != NULL) { 2635 jio_fprintf(defaultStream::output_stream(), "%s", s); 2636 } else { 2637 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2638 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2639 } 2640 } 2641 2642 } // Extern C 2643 2644 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2645 2646 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 2647 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or 2648 // OSThread objects. The exception to this rule is when the target object is the thread 2649 // doing the operation, in which case we know that the thread won't exit until the 2650 // operation is done (all exits being voluntary). There are a few cases where it is 2651 // rather silly to do operations on yourself, like resuming yourself or asking whether 2652 // you are alive. While these can still happen, they are not subject to deadlocks if 2653 // the lock is held while the operation occurs (this is not the case for suspend, for 2654 // instance), and are very unlikely. Because IsAlive needs to be fast and its 2655 // implementation is local to this file, we always lock Threads_lock for that one. 2656 2657 static void thread_entry(JavaThread* thread, TRAPS) { 2658 HandleMark hm(THREAD); 2659 Handle obj(THREAD, thread->threadObj()); 2660 JavaValue result(T_VOID); 2661 JavaCalls::call_virtual(&result, 2662 obj, 2663 KlassHandle(THREAD, SystemDictionary::Thread_klass()), 2664 vmSymbols::run_method_name(), 2665 vmSymbols::void_method_signature(), 2666 THREAD); 2667 } 2668 2669 2670 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2671 JVMWrapper("JVM_StartThread"); 2672 JavaThread *native_thread = NULL; 2673 2674 // We cannot hold the Threads_lock when we throw an exception, 2675 // due to rank ordering issues. Example: we might need to grab the 2676 // Heap_lock while we construct the exception. 2677 bool throw_illegal_thread_state = false; 2678 2679 // We must release the Threads_lock before we can post a jvmti event 2680 // in Thread::start. 2681 { 2682 // Ensure that the C++ Thread and OSThread structures aren't freed before 2683 // we operate. 2684 MutexLocker mu(Threads_lock); 2685 2686 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2687 // re-starting an already started thread, so we should usually find 2688 // that the JavaThread is null. However for a JNI attached thread 2689 // there is a small window between the Thread object being created 2690 // (with its JavaThread set) and the update to its threadStatus, so we 2691 // have to check for this 2692 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2693 throw_illegal_thread_state = true; 2694 } else { 2695 // We could also check the stillborn flag to see if this thread was already stopped, but 2696 // for historical reasons we let the thread detect that itself when it starts running 2697 2698 jlong size = 2699 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2700 // Allocate the C++ Thread structure and create the native thread. The 2701 // stack size retrieved from java is signed, but the constructor takes 2702 // size_t (an unsigned type), so avoid passing negative values which would 2703 // result in really large stacks. 2704 size_t sz = size > 0 ? (size_t) size : 0; 2705 native_thread = new JavaThread(&thread_entry, sz); 2706 2707 // At this point it may be possible that no osthread was created for the 2708 // JavaThread due to lack of memory. Check for this situation and throw 2709 // an exception if necessary. Eventually we may want to change this so 2710 // that we only grab the lock if the thread was created successfully - 2711 // then we can also do this check and throw the exception in the 2712 // JavaThread constructor. 2713 if (native_thread->osthread() != NULL) { 2714 // Note: the current thread is not being used within "prepare". 2715 native_thread->prepare(jthread); 2716 } 2717 } 2718 } 2719 2720 if (throw_illegal_thread_state) { 2721 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2722 } 2723 2724 assert(native_thread != NULL, "Starting null thread?"); 2725 2726 if (native_thread->osthread() == NULL) { 2727 // No one should hold a reference to the 'native_thread'. 2728 delete native_thread; 2729 if (JvmtiExport::should_post_resource_exhausted()) { 2730 JvmtiExport::post_resource_exhausted( 2731 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2732 os::native_thread_creation_failed_msg()); 2733 } 2734 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2735 os::native_thread_creation_failed_msg()); 2736 } 2737 2738 Thread::start(native_thread); 2739 2740 JVM_END 2741 2742 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2743 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2744 // but is thought to be reliable and simple. In the case, where the receiver is the 2745 // same thread as the sender, no safepoint is needed. 2746 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2747 JVMWrapper("JVM_StopThread"); 2748 2749 oop java_throwable = JNIHandles::resolve(throwable); 2750 if (java_throwable == NULL) { 2751 THROW(vmSymbols::java_lang_NullPointerException()); 2752 } 2753 oop java_thread = JNIHandles::resolve_non_null(jthread); 2754 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2755 Events::log_exception(JavaThread::current(), 2756 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2757 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2758 // First check if thread is alive 2759 if (receiver != NULL) { 2760 // Check if exception is getting thrown at self (use oop equality, since the 2761 // target object might exit) 2762 if (java_thread == thread->threadObj()) { 2763 THROW_OOP(java_throwable); 2764 } else { 2765 // Enques a VM_Operation to stop all threads and then deliver the exception... 2766 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 2767 } 2768 } 2769 else { 2770 // Either: 2771 // - target thread has not been started before being stopped, or 2772 // - target thread already terminated 2773 // We could read the threadStatus to determine which case it is 2774 // but that is overkill as it doesn't matter. We must set the 2775 // stillborn flag for the first case, and if the thread has already 2776 // exited setting this flag has no affect 2777 java_lang_Thread::set_stillborn(java_thread); 2778 } 2779 JVM_END 2780 2781 2782 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2783 JVMWrapper("JVM_IsThreadAlive"); 2784 2785 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2786 return java_lang_Thread::is_alive(thread_oop); 2787 JVM_END 2788 2789 2790 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2791 JVMWrapper("JVM_SuspendThread"); 2792 oop java_thread = JNIHandles::resolve_non_null(jthread); 2793 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2794 2795 if (receiver != NULL) { 2796 // thread has run and has not exited (still on threads list) 2797 2798 { 2799 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2800 if (receiver->is_external_suspend()) { 2801 // Don't allow nested external suspend requests. We can't return 2802 // an error from this interface so just ignore the problem. 2803 return; 2804 } 2805 if (receiver->is_exiting()) { // thread is in the process of exiting 2806 return; 2807 } 2808 receiver->set_external_suspend(); 2809 } 2810 2811 // java_suspend() will catch threads in the process of exiting 2812 // and will ignore them. 2813 receiver->java_suspend(); 2814 2815 // It would be nice to have the following assertion in all the 2816 // time, but it is possible for a racing resume request to have 2817 // resumed this thread right after we suspended it. Temporarily 2818 // enable this assertion if you are chasing a different kind of 2819 // bug. 2820 // 2821 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2822 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2823 } 2824 JVM_END 2825 2826 2827 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2828 JVMWrapper("JVM_ResumeThread"); 2829 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 2830 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2831 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2832 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2833 // looks at it. 2834 MutexLocker ml(Threads_lock); 2835 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2836 if (thr != NULL) { 2837 // the thread has run and is not in the process of exiting 2838 thr->java_resume(); 2839 } 2840 JVM_END 2841 2842 2843 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2844 JVMWrapper("JVM_SetThreadPriority"); 2845 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2846 MutexLocker ml(Threads_lock); 2847 oop java_thread = JNIHandles::resolve_non_null(jthread); 2848 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2849 JavaThread* thr = java_lang_Thread::thread(java_thread); 2850 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 2851 Thread::set_priority(thr, (ThreadPriority)prio); 2852 } 2853 JVM_END 2854 2855 2856 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2857 JVMWrapper("JVM_Yield"); 2858 if (os::dont_yield()) return; 2859 HOTSPOT_THREAD_YIELD(); 2860 2861 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield. 2862 // Critical for similar threading behaviour 2863 if (ConvertYieldToSleep) { 2864 os::sleep(thread, MinSleepInterval, false); 2865 } else { 2866 os::naked_yield(); 2867 } 2868 JVM_END 2869 2870 2871 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2872 JVMWrapper("JVM_Sleep"); 2873 2874 if (millis < 0) { 2875 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2876 } 2877 2878 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2879 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2880 } 2881 2882 // Save current thread state and restore it at the end of this block. 2883 // And set new thread state to SLEEPING. 2884 JavaThreadSleepState jtss(thread); 2885 2886 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 2887 2888 EventThreadSleep event; 2889 2890 if (millis == 0) { 2891 // When ConvertSleepToYield is on, this matches the classic VM implementation of 2892 // JVM_Sleep. Critical for similar threading behaviour (Win32) 2893 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep 2894 // for SOLARIS 2895 if (ConvertSleepToYield) { 2896 os::naked_yield(); 2897 } else { 2898 ThreadState old_state = thread->osthread()->get_state(); 2899 thread->osthread()->set_state(SLEEPING); 2900 os::sleep(thread, MinSleepInterval, false); 2901 thread->osthread()->set_state(old_state); 2902 } 2903 } else { 2904 ThreadState old_state = thread->osthread()->get_state(); 2905 thread->osthread()->set_state(SLEEPING); 2906 if (os::sleep(thread, millis, true) == OS_INTRPT) { 2907 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 2908 // us while we were sleeping. We do not overwrite those. 2909 if (!HAS_PENDING_EXCEPTION) { 2910 if (event.should_commit()) { 2911 event.set_time(millis); 2912 event.commit(); 2913 } 2914 HOTSPOT_THREAD_SLEEP_END(1); 2915 2916 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 2917 // to properly restore the thread state. That's likely wrong. 2918 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2919 } 2920 } 2921 thread->osthread()->set_state(old_state); 2922 } 2923 if (event.should_commit()) { 2924 event.set_time(millis); 2925 event.commit(); 2926 } 2927 HOTSPOT_THREAD_SLEEP_END(0); 2928 JVM_END 2929 2930 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 2931 JVMWrapper("JVM_CurrentThread"); 2932 oop jthread = thread->threadObj(); 2933 assert (thread != NULL, "no current thread!"); 2934 return JNIHandles::make_local(env, jthread); 2935 JVM_END 2936 2937 2938 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 2939 JVMWrapper("JVM_CountStackFrames"); 2940 2941 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2942 oop java_thread = JNIHandles::resolve_non_null(jthread); 2943 bool throw_illegal_thread_state = false; 2944 int count = 0; 2945 2946 { 2947 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 2948 // We need to re-resolve the java_thread, since a GC might have happened during the 2949 // acquire of the lock 2950 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2951 2952 if (thr == NULL) { 2953 // do nothing 2954 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 2955 // Check whether this java thread has been suspended already. If not, throws 2956 // IllegalThreadStateException. We defer to throw that exception until 2957 // Threads_lock is released since loading exception class has to leave VM. 2958 // The correct way to test a thread is actually suspended is 2959 // wait_for_ext_suspend_completion(), but we can't call that while holding 2960 // the Threads_lock. The above tests are sufficient for our purposes 2961 // provided the walkability of the stack is stable - which it isn't 2962 // 100% but close enough for most practical purposes. 2963 throw_illegal_thread_state = true; 2964 } else { 2965 // Count all java activation, i.e., number of vframes 2966 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 2967 // Native frames are not counted 2968 if (!vfst.method()->is_native()) count++; 2969 } 2970 } 2971 } 2972 2973 if (throw_illegal_thread_state) { 2974 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 2975 "this thread is not suspended"); 2976 } 2977 return count; 2978 JVM_END 2979 2980 // Consider: A better way to implement JVM_Interrupt() is to acquire 2981 // Threads_lock to resolve the jthread into a Thread pointer, fetch 2982 // Thread->platformevent, Thread->native_thr, Thread->parker, etc., 2983 // drop Threads_lock, and the perform the unpark() and thr_kill() operations 2984 // outside the critical section. Threads_lock is hot so we want to minimize 2985 // the hold-time. A cleaner interface would be to decompose interrupt into 2986 // two steps. The 1st phase, performed under Threads_lock, would return 2987 // a closure that'd be invoked after Threads_lock was dropped. 2988 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 2989 // admit spurious wakeups. 2990 2991 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 2992 JVMWrapper("JVM_Interrupt"); 2993 2994 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2995 oop java_thread = JNIHandles::resolve_non_null(jthread); 2996 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 2997 // We need to re-resolve the java_thread, since a GC might have happened during the 2998 // acquire of the lock 2999 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3000 if (thr != NULL) { 3001 Thread::interrupt(thr); 3002 } 3003 JVM_END 3004 3005 3006 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3007 JVMWrapper("JVM_IsInterrupted"); 3008 3009 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3010 oop java_thread = JNIHandles::resolve_non_null(jthread); 3011 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3012 // We need to re-resolve the java_thread, since a GC might have happened during the 3013 // acquire of the lock 3014 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3015 if (thr == NULL) { 3016 return JNI_FALSE; 3017 } else { 3018 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3019 } 3020 JVM_END 3021 3022 3023 // Return true iff the current thread has locked the object passed in 3024 3025 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3026 JVMWrapper("JVM_HoldsLock"); 3027 assert(THREAD->is_Java_thread(), "sanity check"); 3028 if (obj == NULL) { 3029 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3030 } 3031 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3032 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3033 JVM_END 3034 3035 3036 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3037 JVMWrapper("JVM_DumpAllStacks"); 3038 VM_PrintThreads op; 3039 VMThread::execute(&op); 3040 if (JvmtiExport::should_post_data_dump()) { 3041 JvmtiExport::post_data_dump(); 3042 } 3043 JVM_END 3044 3045 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3046 JVMWrapper("JVM_SetNativeThreadName"); 3047 ResourceMark rm(THREAD); 3048 oop java_thread = JNIHandles::resolve_non_null(jthread); 3049 JavaThread* thr = java_lang_Thread::thread(java_thread); 3050 // Thread naming only supported for the current thread, doesn't work for 3051 // target threads. 3052 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3053 // we don't set the name of an attached thread to avoid stepping 3054 // on other programs 3055 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3056 os::set_native_thread_name(thread_name); 3057 } 3058 JVM_END 3059 3060 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3061 3062 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3063 assert(jthread->is_Java_thread(), "must be a Java thread"); 3064 if (jthread->privileged_stack_top() == NULL) return false; 3065 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3066 oop loader = jthread->privileged_stack_top()->class_loader(); 3067 if (loader == NULL) return true; 3068 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3069 if (trusted) return true; 3070 } 3071 return false; 3072 } 3073 3074 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3075 JVMWrapper("JVM_CurrentLoadedClass"); 3076 ResourceMark rm(THREAD); 3077 3078 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3079 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3080 bool trusted = is_trusted_frame(thread, &vfst); 3081 if (trusted) return NULL; 3082 3083 Method* m = vfst.method(); 3084 if (!m->is_native()) { 3085 InstanceKlass* holder = m->method_holder(); 3086 oop loader = holder->class_loader(); 3087 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3088 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3089 } 3090 } 3091 } 3092 return NULL; 3093 JVM_END 3094 3095 3096 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3097 JVMWrapper("JVM_CurrentClassLoader"); 3098 ResourceMark rm(THREAD); 3099 3100 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3101 3102 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3103 bool trusted = is_trusted_frame(thread, &vfst); 3104 if (trusted) return NULL; 3105 3106 Method* m = vfst.method(); 3107 if (!m->is_native()) { 3108 InstanceKlass* holder = m->method_holder(); 3109 assert(holder->is_klass(), "just checking"); 3110 oop loader = holder->class_loader(); 3111 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3112 return JNIHandles::make_local(env, loader); 3113 } 3114 } 3115 } 3116 return NULL; 3117 JVM_END 3118 3119 3120 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3121 JVMWrapper("JVM_GetClassContext"); 3122 ResourceMark rm(THREAD); 3123 JvmtiVMObjectAllocEventCollector oam; 3124 vframeStream vfst(thread); 3125 3126 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3127 // This must only be called from SecurityManager.getClassContext 3128 Method* m = vfst.method(); 3129 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3130 m->name() == vmSymbols::getClassContext_name() && 3131 m->signature() == vmSymbols::void_class_array_signature())) { 3132 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3133 } 3134 } 3135 3136 // Collect method holders 3137 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>(); 3138 for (; !vfst.at_end(); vfst.security_next()) { 3139 Method* m = vfst.method(); 3140 // Native frames are not returned 3141 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3142 Klass* holder = m->method_holder(); 3143 assert(holder->is_klass(), "just checking"); 3144 klass_array->append(holder); 3145 } 3146 } 3147 3148 // Create result array of type [Ljava/lang/Class; 3149 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3150 // Fill in mirrors corresponding to method holders 3151 for (int i = 0; i < klass_array->length(); i++) { 3152 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3153 } 3154 3155 return (jobjectArray) JNIHandles::make_local(env, result); 3156 JVM_END 3157 3158 3159 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3160 JVMWrapper("JVM_ClassDepth"); 3161 ResourceMark rm(THREAD); 3162 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3163 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3164 3165 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3166 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3167 if (class_name_sym == NULL) { 3168 return -1; 3169 } 3170 3171 int depth = 0; 3172 3173 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3174 if (!vfst.method()->is_native()) { 3175 InstanceKlass* holder = vfst.method()->method_holder(); 3176 assert(holder->is_klass(), "just checking"); 3177 if (holder->name() == class_name_sym) { 3178 return depth; 3179 } 3180 depth++; 3181 } 3182 } 3183 return -1; 3184 JVM_END 3185 3186 3187 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3188 JVMWrapper("JVM_ClassLoaderDepth"); 3189 ResourceMark rm(THREAD); 3190 int depth = 0; 3191 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3192 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3193 bool trusted = is_trusted_frame(thread, &vfst); 3194 if (trusted) return -1; 3195 3196 Method* m = vfst.method(); 3197 if (!m->is_native()) { 3198 InstanceKlass* holder = m->method_holder(); 3199 assert(holder->is_klass(), "just checking"); 3200 oop loader = holder->class_loader(); 3201 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3202 return depth; 3203 } 3204 depth++; 3205 } 3206 } 3207 return -1; 3208 JVM_END 3209 3210 3211 // java.lang.Package //////////////////////////////////////////////////////////////// 3212 3213 3214 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3215 JVMWrapper("JVM_GetSystemPackage"); 3216 ResourceMark rm(THREAD); 3217 JvmtiVMObjectAllocEventCollector oam; 3218 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3219 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3220 return (jstring) JNIHandles::make_local(result); 3221 JVM_END 3222 3223 3224 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3225 JVMWrapper("JVM_GetSystemPackages"); 3226 JvmtiVMObjectAllocEventCollector oam; 3227 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3228 return (jobjectArray) JNIHandles::make_local(result); 3229 JVM_END 3230 3231 3232 // ObjectInputStream /////////////////////////////////////////////////////////////// 3233 3234 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3235 if (current_class == NULL) { 3236 return true; 3237 } 3238 if ((current_class == field_class) || access.is_public()) { 3239 return true; 3240 } 3241 3242 if (access.is_protected()) { 3243 // See if current_class is a subclass of field_class 3244 if (current_class->is_subclass_of(field_class)) { 3245 return true; 3246 } 3247 } 3248 3249 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3250 } 3251 3252 // Return the first non-null class loader up the execution stack, or null 3253 // if only code from the null class loader is on the stack. 3254 3255 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3256 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3257 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3258 oop loader = vfst.method()->method_holder()->class_loader(); 3259 if (loader != NULL) { 3260 return JNIHandles::make_local(env, loader); 3261 } 3262 } 3263 return NULL; 3264 JVM_END 3265 3266 3267 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3268 3269 3270 // resolve array handle and check arguments 3271 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3272 if (arr == NULL) { 3273 THROW_0(vmSymbols::java_lang_NullPointerException()); 3274 } 3275 oop a = JNIHandles::resolve_non_null(arr); 3276 if (!a->is_array()) { 3277 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3278 } else if (type_array_only && !a->is_typeArray()) { 3279 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3280 } 3281 return arrayOop(a); 3282 } 3283 3284 3285 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3286 JVMWrapper("JVM_GetArrayLength"); 3287 arrayOop a = check_array(env, arr, false, CHECK_0); 3288 return a->length(); 3289 JVM_END 3290 3291 3292 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3293 JVMWrapper("JVM_Array_Get"); 3294 JvmtiVMObjectAllocEventCollector oam; 3295 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3296 jvalue value; 3297 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3298 oop box = Reflection::box(&value, type, CHECK_NULL); 3299 return JNIHandles::make_local(env, box); 3300 JVM_END 3301 3302 3303 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3304 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3305 jvalue value; 3306 value.i = 0; // to initialize value before getting used in CHECK 3307 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3308 assert(a->is_typeArray(), "just checking"); 3309 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3310 BasicType wide_type = (BasicType) wCode; 3311 if (type != wide_type) { 3312 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3313 } 3314 return value; 3315 JVM_END 3316 3317 3318 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3319 JVMWrapper("JVM_SetArrayElement"); 3320 arrayOop a = check_array(env, arr, false, CHECK); 3321 oop box = JNIHandles::resolve(val); 3322 jvalue value; 3323 value.i = 0; // to initialize value before getting used in CHECK 3324 BasicType value_type; 3325 if (a->is_objArray()) { 3326 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3327 value_type = Reflection::unbox_for_regular_object(box, &value); 3328 } else { 3329 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3330 } 3331 Reflection::array_set(&value, a, index, value_type, CHECK); 3332 JVM_END 3333 3334 3335 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3336 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3337 arrayOop a = check_array(env, arr, true, CHECK); 3338 assert(a->is_typeArray(), "just checking"); 3339 BasicType value_type = (BasicType) vCode; 3340 Reflection::array_set(&v, a, index, value_type, CHECK); 3341 JVM_END 3342 3343 3344 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3345 JVMWrapper("JVM_NewArray"); 3346 JvmtiVMObjectAllocEventCollector oam; 3347 oop element_mirror = JNIHandles::resolve(eltClass); 3348 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3349 return JNIHandles::make_local(env, result); 3350 JVM_END 3351 3352 3353 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3354 JVMWrapper("JVM_NewMultiArray"); 3355 JvmtiVMObjectAllocEventCollector oam; 3356 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3357 oop element_mirror = JNIHandles::resolve(eltClass); 3358 assert(dim_array->is_typeArray(), "just checking"); 3359 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3360 return JNIHandles::make_local(env, result); 3361 JVM_END 3362 3363 3364 // Library support /////////////////////////////////////////////////////////////////////////// 3365 3366 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3367 //%note jvm_ct 3368 JVMWrapper2("JVM_LoadLibrary (%s)", name); 3369 char ebuf[1024]; 3370 void *load_result; 3371 { 3372 ThreadToNativeFromVM ttnfvm(thread); 3373 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3374 } 3375 if (load_result == NULL) { 3376 char msg[1024]; 3377 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3378 // Since 'ebuf' may contain a string encoded using 3379 // platform encoding scheme, we need to pass 3380 // Exceptions::unsafe_to_utf8 to the new_exception method 3381 // as the last argument. See bug 6367357. 3382 Handle h_exception = 3383 Exceptions::new_exception(thread, 3384 vmSymbols::java_lang_UnsatisfiedLinkError(), 3385 msg, Exceptions::unsafe_to_utf8); 3386 3387 THROW_HANDLE_0(h_exception); 3388 } 3389 return load_result; 3390 JVM_END 3391 3392 3393 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3394 JVMWrapper("JVM_UnloadLibrary"); 3395 os::dll_unload(handle); 3396 JVM_END 3397 3398 3399 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3400 JVMWrapper2("JVM_FindLibraryEntry (%s)", name); 3401 return os::dll_lookup(handle, name); 3402 JVM_END 3403 3404 3405 // JNI version /////////////////////////////////////////////////////////////////////////////// 3406 3407 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3408 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version); 3409 return Threads::is_supported_jni_version_including_1_1(version); 3410 JVM_END 3411 3412 3413 // String support /////////////////////////////////////////////////////////////////////////// 3414 3415 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3416 JVMWrapper("JVM_InternString"); 3417 JvmtiVMObjectAllocEventCollector oam; 3418 if (str == NULL) return NULL; 3419 oop string = JNIHandles::resolve_non_null(str); 3420 oop result = StringTable::intern(string, CHECK_NULL); 3421 return (jstring) JNIHandles::make_local(env, result); 3422 JVM_END 3423 3424 3425 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3426 3427 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3428 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3429 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3430 // that only works with java threads. 3431 3432 3433 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3434 VM_Exit::block_if_vm_exited(); 3435 JVMWrapper("JVM_RawMonitorCreate"); 3436 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3437 } 3438 3439 3440 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3441 VM_Exit::block_if_vm_exited(); 3442 JVMWrapper("JVM_RawMonitorDestroy"); 3443 delete ((Mutex*) mon); 3444 } 3445 3446 3447 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3448 VM_Exit::block_if_vm_exited(); 3449 JVMWrapper("JVM_RawMonitorEnter"); 3450 ((Mutex*) mon)->jvm_raw_lock(); 3451 return 0; 3452 } 3453 3454 3455 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3456 VM_Exit::block_if_vm_exited(); 3457 JVMWrapper("JVM_RawMonitorExit"); 3458 ((Mutex*) mon)->jvm_raw_unlock(); 3459 } 3460 3461 3462 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3463 3464 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3465 Handle loader, Handle protection_domain, 3466 jboolean throwError, TRAPS) { 3467 // Security Note: 3468 // The Java level wrapper will perform the necessary security check allowing 3469 // us to pass the NULL as the initiating class loader. The VM is responsible for 3470 // the checkPackageAccess relative to the initiating class loader via the 3471 // protection_domain. The protection_domain is passed as NULL by the java code 3472 // if there is no security manager in 3-arg Class.forName(). 3473 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3474 3475 KlassHandle klass_handle(THREAD, klass); 3476 // Check if we should initialize the class 3477 if (init && klass_handle->oop_is_instance()) { 3478 klass_handle->initialize(CHECK_NULL); 3479 } 3480 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror()); 3481 } 3482 3483 3484 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3485 3486 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3487 JVMWrapper("JVM_InvokeMethod"); 3488 Handle method_handle; 3489 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3490 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3491 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3492 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3493 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3494 jobject res = JNIHandles::make_local(env, result); 3495 if (JvmtiExport::should_post_vm_object_alloc()) { 3496 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3497 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3498 if (java_lang_Class::is_primitive(ret_type)) { 3499 // Only for primitive type vm allocates memory for java object. 3500 // See box() method. 3501 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3502 } 3503 } 3504 return res; 3505 } else { 3506 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3507 } 3508 JVM_END 3509 3510 3511 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3512 JVMWrapper("JVM_NewInstanceFromConstructor"); 3513 oop constructor_mirror = JNIHandles::resolve(c); 3514 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3515 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3516 jobject res = JNIHandles::make_local(env, result); 3517 if (JvmtiExport::should_post_vm_object_alloc()) { 3518 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3519 } 3520 return res; 3521 JVM_END 3522 3523 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3524 3525 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3526 JVMWrapper("JVM_SupportsCX8"); 3527 return VM_Version::supports_cx8(); 3528 JVM_END 3529 3530 // Returns an array of all live Thread objects (VM internal JavaThreads, 3531 // jvmti agent threads, and JNI attaching threads are skipped) 3532 // See CR 6404306 regarding JNI attaching threads 3533 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3534 ResourceMark rm(THREAD); 3535 ThreadsListEnumerator tle(THREAD, false, false); 3536 JvmtiVMObjectAllocEventCollector oam; 3537 3538 int num_threads = tle.num_threads(); 3539 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3540 objArrayHandle threads_ah(THREAD, r); 3541 3542 for (int i = 0; i < num_threads; i++) { 3543 Handle h = tle.get_threadObj(i); 3544 threads_ah->obj_at_put(i, h()); 3545 } 3546 3547 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3548 JVM_END 3549 3550 3551 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3552 // Return StackTraceElement[][], each element is the stack trace of a thread in 3553 // the corresponding entry in the given threads array 3554 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3555 JVMWrapper("JVM_DumpThreads"); 3556 JvmtiVMObjectAllocEventCollector oam; 3557 3558 // Check if threads is null 3559 if (threads == NULL) { 3560 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3561 } 3562 3563 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3564 objArrayHandle ah(THREAD, a); 3565 int num_threads = ah->length(); 3566 // check if threads is non-empty array 3567 if (num_threads == 0) { 3568 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3569 } 3570 3571 // check if threads is not an array of objects of Thread class 3572 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3573 if (k != SystemDictionary::Thread_klass()) { 3574 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3575 } 3576 3577 ResourceMark rm(THREAD); 3578 3579 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3580 for (int i = 0; i < num_threads; i++) { 3581 oop thread_obj = ah->obj_at(i); 3582 instanceHandle h(THREAD, (instanceOop) thread_obj); 3583 thread_handle_array->append(h); 3584 } 3585 3586 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3587 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3588 3589 JVM_END 3590 3591 // JVM monitoring and management support 3592 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3593 return Management::get_jmm_interface(version); 3594 JVM_END 3595 3596 // com.sun.tools.attach.VirtualMachine agent properties support 3597 // 3598 // Initialize the agent properties with the properties maintained in the VM 3599 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3600 JVMWrapper("JVM_InitAgentProperties"); 3601 ResourceMark rm; 3602 3603 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3604 3605 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3606 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3607 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3608 return properties; 3609 JVM_END 3610 3611 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3612 { 3613 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3614 JvmtiVMObjectAllocEventCollector oam; 3615 3616 if (ofClass == NULL) { 3617 return NULL; 3618 } 3619 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3620 // Special handling for primitive objects 3621 if (java_lang_Class::is_primitive(mirror())) { 3622 return NULL; 3623 } 3624 Klass* k = java_lang_Class::as_Klass(mirror()); 3625 if (!k->oop_is_instance()) { 3626 return NULL; 3627 } 3628 instanceKlassHandle ik_h(THREAD, k); 3629 int encl_method_class_idx = ik_h->enclosing_method_class_index(); 3630 if (encl_method_class_idx == 0) { 3631 return NULL; 3632 } 3633 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3634 objArrayHandle dest(THREAD, dest_o); 3635 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3636 dest->obj_at_put(0, enc_k->java_mirror()); 3637 int encl_method_method_idx = ik_h->enclosing_method_method_index(); 3638 if (encl_method_method_idx != 0) { 3639 Symbol* sym = ik_h->constants()->symbol_at( 3640 extract_low_short_from_int( 3641 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3642 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3643 dest->obj_at_put(1, str()); 3644 sym = ik_h->constants()->symbol_at( 3645 extract_high_short_from_int( 3646 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3647 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3648 dest->obj_at_put(2, str()); 3649 } 3650 return (jobjectArray) JNIHandles::make_local(dest()); 3651 } 3652 JVM_END 3653 3654 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3655 { 3656 memset(info, 0, info_size); 3657 3658 info->jvm_version = Abstract_VM_Version::jvm_version(); 3659 info->update_version = 0; /* 0 in HotSpot Express VM */ 3660 info->special_update_version = 0; /* 0 in HotSpot Express VM */ 3661 3662 // when we add a new capability in the jvm_version_info struct, we should also 3663 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3664 // counter defined in runtimeService.cpp. 3665 info->is_attachable = AttachListener::is_attach_supported(); 3666 } 3667 JVM_END