1 /* 2 * Copyright (c) 1997, 2016, 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/classFileStream.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/classLoaderData.inline.hpp" 29 #include "classfile/javaAssertions.hpp" 30 #include "classfile/javaClasses.inline.hpp" 31 #include "classfile/moduleEntry.hpp" 32 #include "classfile/modules.hpp" 33 #include "classfile/packageEntry.hpp" 34 #include "classfile/stringTable.hpp" 35 #include "classfile/systemDictionary.hpp" 36 #include "classfile/vmSymbols.hpp" 37 #include "gc/shared/barrierSet.inline.hpp" 38 #include "gc/shared/collectedHeap.inline.hpp" 39 #include "interpreter/bytecode.hpp" 40 #include "memory/oopFactory.hpp" 41 #include "memory/resourceArea.hpp" 42 #include "memory/universe.inline.hpp" 43 #include "oops/fieldStreams.hpp" 44 #include "oops/instanceKlass.hpp" 45 #include "oops/method.hpp" 46 #include "oops/objArrayKlass.hpp" 47 #include "oops/objArrayOop.inline.hpp" 48 #include "oops/oop.inline.hpp" 49 #include "prims/jvm.h" 50 #include "prims/jvm_misc.hpp" 51 #include "prims/jvmtiExport.hpp" 52 #include "prims/jvmtiThreadState.hpp" 53 #include "prims/nativeLookup.hpp" 54 #include "prims/privilegedStack.hpp" 55 #include "prims/stackwalk.hpp" 56 #include "runtime/arguments.hpp" 57 #include "runtime/atomic.inline.hpp" 58 #include "runtime/handles.inline.hpp" 59 #include "runtime/init.hpp" 60 #include "runtime/interfaceSupport.hpp" 61 #include "runtime/java.hpp" 62 #include "runtime/javaCalls.hpp" 63 #include "runtime/jfieldIDWorkaround.hpp" 64 #include "runtime/orderAccess.inline.hpp" 65 #include "runtime/os.inline.hpp" 66 #include "runtime/perfData.hpp" 67 #include "runtime/reflection.hpp" 68 #include "runtime/thread.inline.hpp" 69 #include "runtime/vframe.hpp" 70 #include "runtime/vm_operations.hpp" 71 #include "runtime/vm_version.hpp" 72 #include "services/attachListener.hpp" 73 #include "services/management.hpp" 74 #include "services/threadService.hpp" 75 #include "trace/tracing.hpp" 76 #include "utilities/copy.hpp" 77 #include "utilities/defaultStream.hpp" 78 #include "utilities/dtrace.hpp" 79 #include "utilities/events.hpp" 80 #include "utilities/histogram.hpp" 81 #include "utilities/macros.hpp" 82 #include "utilities/utf8.hpp" 83 #if INCLUDE_CDS 84 #include "classfile/sharedClassUtil.hpp" 85 #include "classfile/systemDictionaryShared.hpp" 86 #endif 87 88 #include <errno.h> 89 90 /* 91 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 92 such ctors and calls MUST NOT come between an oop declaration/init and its 93 usage because if objects are move this may cause various memory stomps, bus 94 errors and segfaults. Here is a cookbook for causing so called "naked oop 95 failures": 96 97 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 98 JVMWrapper("JVM_GetClassDeclaredFields"); 99 100 // Object address to be held directly in mirror & not visible to GC 101 oop mirror = JNIHandles::resolve_non_null(ofClass); 102 103 // If this ctor can hit a safepoint, moving objects around, then 104 ComplexConstructor foo; 105 106 // Boom! mirror may point to JUNK instead of the intended object 107 (some dereference of mirror) 108 109 // Here's another call that may block for GC, making mirror stale 110 MutexLocker ml(some_lock); 111 112 // And here's an initializer that can result in a stale oop 113 // all in one step. 114 oop o = call_that_can_throw_exception(TRAPS); 115 116 117 The solution is to keep the oop declaration BELOW the ctor or function 118 call that might cause a GC, do another resolve to reassign the oop, or 119 consider use of a Handle instead of an oop so there is immunity from object 120 motion. But note that the "QUICK" entries below do not have a handlemark 121 and thus can only support use of handles passed in. 122 */ 123 124 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 125 ResourceMark rm; 126 int line_number = -1; 127 const char * source_file = NULL; 128 const char * trace = "explicit"; 129 InstanceKlass* caller = NULL; 130 JavaThread* jthread = JavaThread::current(); 131 if (jthread->has_last_Java_frame()) { 132 vframeStream vfst(jthread); 133 134 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 135 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 136 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 137 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 138 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 139 140 Method* last_caller = NULL; 141 142 while (!vfst.at_end()) { 143 Method* m = vfst.method(); 144 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 145 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 146 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 147 break; 148 } 149 last_caller = m; 150 vfst.next(); 151 } 152 // if this is called from Class.forName0 and that is called from Class.forName, 153 // then print the caller of Class.forName. If this is Class.loadClass, then print 154 // that caller, otherwise keep quiet since this should be picked up elsewhere. 155 bool found_it = false; 156 if (!vfst.at_end() && 157 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 158 vfst.method()->name() == vmSymbols::forName0_name()) { 159 vfst.next(); 160 if (!vfst.at_end() && 161 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 162 vfst.method()->name() == vmSymbols::forName_name()) { 163 vfst.next(); 164 found_it = true; 165 } 166 } else if (last_caller != NULL && 167 last_caller->method_holder()->name() == 168 vmSymbols::java_lang_ClassLoader() && 169 (last_caller->name() == vmSymbols::loadClassInternal_name() || 170 last_caller->name() == vmSymbols::loadClass_name())) { 171 found_it = true; 172 } else if (!vfst.at_end()) { 173 if (vfst.method()->is_native()) { 174 // JNI call 175 found_it = true; 176 } 177 } 178 if (found_it && !vfst.at_end()) { 179 // found the caller 180 caller = vfst.method()->method_holder(); 181 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 182 if (line_number == -1) { 183 // show method name if it's a native method 184 trace = vfst.method()->name_and_sig_as_C_string(); 185 } 186 Symbol* s = caller->source_file_name(); 187 if (s != NULL) { 188 source_file = s->as_C_string(); 189 } 190 } 191 } 192 if (caller != NULL) { 193 if (to_class != caller) { 194 const char * from = caller->external_name(); 195 const char * to = to_class->external_name(); 196 // print in a single call to reduce interleaving between threads 197 if (source_file != NULL) { 198 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 199 } else { 200 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 201 } 202 } 203 } 204 } 205 206 void trace_class_resolution(Klass* to_class) { 207 EXCEPTION_MARK; 208 trace_class_resolution_impl(to_class, THREAD); 209 if (HAS_PENDING_EXCEPTION) { 210 CLEAR_PENDING_EXCEPTION; 211 } 212 } 213 214 // Wrapper to trace JVM functions 215 216 #ifdef ASSERT 217 Histogram* JVMHistogram; 218 volatile jint JVMHistogram_lock = 0; 219 220 class JVMHistogramElement : public HistogramElement { 221 public: 222 JVMHistogramElement(const char* name); 223 }; 224 225 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 226 _name = elementName; 227 uintx count = 0; 228 229 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 230 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 231 count +=1; 232 if ( (WarnOnStalledSpinLock > 0) 233 && (count % WarnOnStalledSpinLock == 0)) { 234 warning("JVMHistogram_lock seems to be stalled"); 235 } 236 } 237 } 238 239 if(JVMHistogram == NULL) 240 JVMHistogram = new Histogram("JVM Call Counts",100); 241 242 JVMHistogram->add_element(this); 243 Atomic::dec(&JVMHistogram_lock); 244 } 245 246 #define JVMCountWrapper(arg) \ 247 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 248 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 249 250 #define JVMWrapper(arg) JVMCountWrapper(arg); 251 #else 252 #define JVMWrapper(arg) 253 #endif 254 255 256 // Interface version ///////////////////////////////////////////////////////////////////// 257 258 259 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 260 return JVM_INTERFACE_VERSION; 261 JVM_END 262 263 264 // java.lang.System ////////////////////////////////////////////////////////////////////// 265 266 267 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 268 JVMWrapper("JVM_CurrentTimeMillis"); 269 return os::javaTimeMillis(); 270 JVM_END 271 272 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 273 JVMWrapper("JVM_NanoTime"); 274 return os::javaTimeNanos(); 275 JVM_END 276 277 // The function below is actually exposed by jdk.internal.misc.VM and not 278 // java.lang.System, but we choose to keep it here so that it stays next 279 // to JVM_CurrentTimeMillis and JVM_NanoTime 280 281 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 282 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 283 284 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 285 JVMWrapper("JVM_GetNanoTimeAdjustment"); 286 jlong seconds; 287 jlong nanos; 288 289 os::javaTimeSystemUTC(seconds, nanos); 290 291 // We're going to verify that the result can fit in a long. 292 // For that we need the difference in seconds between 'seconds' 293 // and 'offset_secs' to be such that: 294 // |seconds - offset_secs| < (2^63/10^9) 295 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 296 // which makes |seconds - offset_secs| < 2^33 297 // and we will prefer +/- 2^32 as the maximum acceptable diff 298 // as 2^32 has a more natural feel than 2^33... 299 // 300 // So if |seconds - offset_secs| >= 2^32 - we return a special 301 // sentinel value (-1) which the caller should take as an 302 // exception value indicating that the offset given to us is 303 // too far from range of the current time - leading to too big 304 // a nano adjustment. The caller is expected to recover by 305 // computing a more accurate offset and calling this method 306 // again. (For the record 2^32 secs is ~136 years, so that 307 // should rarely happen) 308 // 309 jlong diff = seconds - offset_secs; 310 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 311 return -1; // sentinel value: the offset is too far off the target 312 } 313 314 // return the adjustment. If you compute a time by adding 315 // this number of nanoseconds along with the number of seconds 316 // in the offset you should get the current UTC time. 317 return (diff * (jlong)1000000000) + nanos; 318 JVM_END 319 320 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 321 jobject dst, jint dst_pos, jint length)) 322 JVMWrapper("JVM_ArrayCopy"); 323 // Check if we have null pointers 324 if (src == NULL || dst == NULL) { 325 THROW(vmSymbols::java_lang_NullPointerException()); 326 } 327 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 328 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 329 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop"); 330 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop"); 331 // Do copy 332 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 333 JVM_END 334 335 336 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 337 JavaValue r(T_OBJECT); 338 // public synchronized Object put(Object key, Object value); 339 HandleMark hm(THREAD); 340 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 341 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 342 JavaCalls::call_virtual(&r, 343 props, 344 KlassHandle(THREAD, SystemDictionary::Properties_klass()), 345 vmSymbols::put_name(), 346 vmSymbols::object_object_object_signature(), 347 key_str, 348 value_str, 349 THREAD); 350 } 351 352 353 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 354 355 356 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 357 JVMWrapper("JVM_InitProperties"); 358 ResourceMark rm; 359 360 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 361 362 // System property list includes both user set via -D option and 363 // jvm system specific properties. 364 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 365 PUTPROP(props, p->key(), p->value()); 366 } 367 368 // Convert the -XX:MaxDirectMemorySize= command line flag 369 // to the sun.nio.MaxDirectMemorySize property. 370 // Do this after setting user properties to prevent people 371 // from setting the value with a -D option, as requested. 372 { 373 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 374 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 375 } else { 376 char as_chars[256]; 377 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 378 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 379 } 380 } 381 382 // JVM monitoring and management support 383 // Add the sun.management.compiler property for the compiler's name 384 { 385 #undef CSIZE 386 #if defined(_LP64) || defined(_WIN64) 387 #define CSIZE "64-Bit " 388 #else 389 #define CSIZE 390 #endif // 64bit 391 392 #ifdef TIERED 393 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 394 #else 395 #if defined(COMPILER1) 396 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 397 #elif defined(COMPILER2) 398 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 399 #elif INCLUDE_JVMCI 400 #error "INCLUDE_JVMCI should imply TIERED" 401 #else 402 const char* compiler_name = ""; 403 #endif // compilers 404 #endif // TIERED 405 406 if (*compiler_name != '\0' && 407 (Arguments::mode() != Arguments::_int)) { 408 PUTPROP(props, "sun.management.compiler", compiler_name); 409 } 410 } 411 412 return properties; 413 JVM_END 414 415 416 /* 417 * Return the temporary directory that the VM uses for the attach 418 * and perf data files. 419 * 420 * It is important that this directory is well-known and the 421 * same for all VM instances. It cannot be affected by configuration 422 * variables such as java.io.tmpdir. 423 */ 424 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 425 JVMWrapper("JVM_GetTemporaryDirectory"); 426 HandleMark hm(THREAD); 427 const char* temp_dir = os::get_temp_directory(); 428 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 429 return (jstring) JNIHandles::make_local(env, h()); 430 JVM_END 431 432 433 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 434 435 extern volatile jint vm_created; 436 437 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 438 before_exit(thread); 439 vm_exit(code); 440 JVM_END 441 442 443 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 444 JVMWrapper("JVM_GC"); 445 if (!DisableExplicitGC) { 446 Universe::heap()->collect(GCCause::_java_lang_system_gc); 447 } 448 JVM_END 449 450 451 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 452 JVMWrapper("JVM_MaxObjectInspectionAge"); 453 return Universe::heap()->millis_since_last_gc(); 454 JVM_END 455 456 457 static inline jlong convert_size_t_to_jlong(size_t val) { 458 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 459 NOT_LP64 (return (jlong)val;) 460 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 461 } 462 463 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 464 JVMWrapper("JVM_TotalMemory"); 465 size_t n = Universe::heap()->capacity(); 466 return convert_size_t_to_jlong(n); 467 JVM_END 468 469 470 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 471 JVMWrapper("JVM_FreeMemory"); 472 CollectedHeap* ch = Universe::heap(); 473 size_t n; 474 { 475 MutexLocker x(Heap_lock); 476 n = ch->capacity() - ch->used(); 477 } 478 return convert_size_t_to_jlong(n); 479 JVM_END 480 481 482 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 483 JVMWrapper("JVM_MaxMemory"); 484 size_t n = Universe::heap()->max_capacity(); 485 return convert_size_t_to_jlong(n); 486 JVM_END 487 488 489 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 490 JVMWrapper("JVM_ActiveProcessorCount"); 491 return os::active_processor_count(); 492 JVM_END 493 494 495 496 // java.lang.Throwable ////////////////////////////////////////////////////// 497 498 499 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 500 JVMWrapper("JVM_FillInStackTrace"); 501 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 502 java_lang_Throwable::fill_in_stack_trace(exception); 503 JVM_END 504 505 506 JVM_ENTRY(void, JVM_GetStackTraceElements(JNIEnv *env, jobject throwable, jobjectArray stackTrace)) 507 JVMWrapper("JVM_GetStackTraceElements"); 508 Handle exception(THREAD, JNIHandles::resolve(throwable)); 509 objArrayOop st = objArrayOop(JNIHandles::resolve(stackTrace)); 510 objArrayHandle stack_trace(THREAD, st); 511 // Fill in the allocated stack trace 512 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 513 JVM_END 514 515 516 // java.lang.StackWalker ////////////////////////////////////////////////////// 517 518 519 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 520 jint skip_frames, jint frame_count, jint start_index, 521 jobjectArray frames)) 522 JVMWrapper("JVM_CallStackWalk"); 523 JavaThread* jt = (JavaThread*) THREAD; 524 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 525 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 526 } 527 528 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 529 530 // frames array is a Class<?>[] array when only getting caller reference, 531 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 532 // be null. 533 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 534 objArrayHandle frames_array_h(THREAD, fa); 535 536 int limit = start_index + frame_count; 537 if (frames_array_h->length() < limit) { 538 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 539 } 540 541 Handle result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 542 start_index, frames_array_h, CHECK_NULL); 543 return JNIHandles::make_local(env, result()); 544 JVM_END 545 546 547 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 548 jint frame_count, jint start_index, 549 jobjectArray frames)) 550 JVMWrapper("JVM_MoreStackWalk"); 551 JavaThread* jt = (JavaThread*) THREAD; 552 553 // frames array is a Class<?>[] array when only getting caller reference, 554 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 555 // be null. 556 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 557 objArrayHandle frames_array_h(THREAD, fa); 558 559 int limit = start_index+frame_count; 560 if (frames_array_h->length() < limit) { 561 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 562 } 563 564 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 565 return StackWalk::moreFrames(stackStream_h, mode, anchor, frame_count, 566 start_index, frames_array_h, THREAD); 567 JVM_END 568 569 JVM_ENTRY(void, JVM_ToStackTraceElement(JNIEnv *env, jobject frame, jobject stack)) 570 JVMWrapper("JVM_ToStackTraceElement"); 571 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(frame)); 572 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(stack)); 573 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 574 JVM_END 575 576 // java.lang.Object /////////////////////////////////////////////// 577 578 579 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 580 JVMWrapper("JVM_IHashCode"); 581 // as implemented in the classic virtual machine; return 0 if object is NULL 582 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 583 JVM_END 584 585 586 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 587 JVMWrapper("JVM_MonitorWait"); 588 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 589 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 590 if (JvmtiExport::should_post_monitor_wait()) { 591 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 592 593 // The current thread already owns the monitor and it has not yet 594 // been added to the wait queue so the current thread cannot be 595 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 596 // event handler cannot accidentally consume an unpark() meant for 597 // the ParkEvent associated with this ObjectMonitor. 598 } 599 ObjectSynchronizer::wait(obj, ms, CHECK); 600 JVM_END 601 602 603 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 604 JVMWrapper("JVM_MonitorNotify"); 605 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 606 ObjectSynchronizer::notify(obj, CHECK); 607 JVM_END 608 609 610 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 611 JVMWrapper("JVM_MonitorNotifyAll"); 612 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 613 ObjectSynchronizer::notifyall(obj, CHECK); 614 JVM_END 615 616 617 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 618 JVMWrapper("JVM_Clone"); 619 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 620 const KlassHandle klass (THREAD, obj->klass()); 621 JvmtiVMObjectAllocEventCollector oam; 622 623 #ifdef ASSERT 624 // Just checking that the cloneable flag is set correct 625 if (obj->is_array()) { 626 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 627 } else { 628 guarantee(obj->is_instance(), "should be instanceOop"); 629 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 630 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 631 } 632 #endif 633 634 // Check if class of obj supports the Cloneable interface. 635 // All arrays are considered to be cloneable (See JLS 20.1.5) 636 if (!klass->is_cloneable()) { 637 ResourceMark rm(THREAD); 638 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 639 } 640 641 // Make shallow object copy 642 const int size = obj->size(); 643 oop new_obj_oop = NULL; 644 if (obj->is_array()) { 645 const int length = ((arrayOop)obj())->length(); 646 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 647 } else { 648 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 649 } 650 651 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread 652 // is modifying a reference field in the clonee, a non-oop-atomic copy might 653 // be suspended in the middle of copying the pointer and end up with parts 654 // of two different pointers in the field. Subsequent dereferences will crash. 655 // 4846409: an oop-copy of objects with long or double fields or arrays of same 656 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead 657 // of oops. We know objects are aligned on a minimum of an jlong boundary. 658 // The same is true of StubRoutines::object_copy and the various oop_copy 659 // variants, and of the code generated by the inline_native_clone intrinsic. 660 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); 661 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop, 662 (size_t)align_object_size(size) / HeapWordsPerLong); 663 // Clear the header 664 new_obj_oop->init_mark(); 665 666 // Store check (mark entire object and let gc sort it out) 667 BarrierSet* bs = Universe::heap()->barrier_set(); 668 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); 669 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); 670 671 Handle new_obj(THREAD, new_obj_oop); 672 // Special handling for MemberNames. Since they contain Method* metadata, they 673 // must be registered so that RedefineClasses can fix metadata contained in them. 674 if (java_lang_invoke_MemberName::is_instance(new_obj()) && 675 java_lang_invoke_MemberName::is_method(new_obj())) { 676 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj()); 677 // MemberName may be unresolved, so doesn't need registration until resolved. 678 if (method != NULL) { 679 methodHandle m(THREAD, method); 680 // This can safepoint and redefine method, so need both new_obj and method 681 // in a handle, for two different reasons. new_obj can move, method can be 682 // deleted if nothing is using it on the stack. 683 m->method_holder()->add_member_name(new_obj(), false); 684 } 685 } 686 687 // Caution: this involves a java upcall, so the clone should be 688 // "gc-robust" by this stage. 689 if (klass->has_finalizer()) { 690 assert(obj->is_instance(), "should be instanceOop"); 691 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 692 new_obj = Handle(THREAD, new_obj_oop); 693 } 694 695 return JNIHandles::make_local(env, new_obj()); 696 JVM_END 697 698 // java.io.File /////////////////////////////////////////////////////////////// 699 700 JVM_LEAF(char*, JVM_NativePath(char* path)) 701 JVMWrapper("JVM_NativePath"); 702 return os::native_path(path); 703 JVM_END 704 705 706 // Misc. class handling /////////////////////////////////////////////////////////// 707 708 709 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 710 JVMWrapper("JVM_GetCallerClass"); 711 712 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 713 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 714 // temporarily for existing code to use until a replacement API is defined. 715 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 716 Klass* k = thread->security_get_caller_class(depth); 717 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 718 } 719 720 // Getting the class of the caller frame. 721 // 722 // The call stack at this point looks something like this: 723 // 724 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 725 // [1] [ @CallerSensitive API.method ] 726 // [.] [ (skipped intermediate frames) ] 727 // [n] [ caller ] 728 vframeStream vfst(thread); 729 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 730 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 731 Method* m = vfst.method(); 732 assert(m != NULL, "sanity"); 733 switch (n) { 734 case 0: 735 // This must only be called from Reflection.getCallerClass 736 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 737 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 738 } 739 // fall-through 740 case 1: 741 // Frame 0 and 1 must be caller sensitive. 742 if (!m->caller_sensitive()) { 743 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 744 } 745 break; 746 default: 747 if (!m->is_ignored_by_security_stack_walk()) { 748 // We have reached the desired frame; return the holder class. 749 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 750 } 751 break; 752 } 753 } 754 return NULL; 755 JVM_END 756 757 758 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 759 JVMWrapper("JVM_FindPrimitiveClass"); 760 oop mirror = NULL; 761 BasicType t = name2type(utf); 762 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 763 mirror = Universe::java_mirror(t); 764 } 765 if (mirror == NULL) { 766 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 767 } else { 768 return (jclass) JNIHandles::make_local(env, mirror); 769 } 770 JVM_END 771 772 773 // Returns a class loaded by the bootstrap class loader; or null 774 // if not found. ClassNotFoundException is not thrown. 775 // FindClassFromBootLoader is exported to the launcher for windows. 776 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 777 const char* name)) 778 JVMWrapper("JVM_FindClassFromBootLoader"); 779 780 // Java libraries should ensure that name is never null... 781 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 782 // It's impossible to create this class; the name cannot fit 783 // into the constant pool. 784 return NULL; 785 } 786 787 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 788 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 789 if (k == NULL) { 790 return NULL; 791 } 792 793 if (log_is_enabled(Debug, class, resolve)) { 794 trace_class_resolution(k); 795 } 796 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 797 JVM_END 798 799 // Find a class with this name in this loader, using the caller's protection domain. 800 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 801 jboolean init, jobject loader, 802 jclass caller)) 803 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 804 // Java libraries should ensure that name is never null... 805 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 806 // It's impossible to create this class; the name cannot fit 807 // into the constant pool. 808 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 809 } 810 811 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 812 813 oop loader_oop = JNIHandles::resolve(loader); 814 oop from_class = JNIHandles::resolve(caller); 815 oop protection_domain = NULL; 816 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 817 // NPE. Put it in another way, the bootstrap class loader has all permission and 818 // thus no checkPackageAccess equivalence in the VM class loader. 819 // The caller is also passed as NULL by the java code if there is no security 820 // manager to avoid the performance cost of getting the calling class. 821 if (from_class != NULL && loader_oop != NULL) { 822 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 823 } 824 825 Handle h_loader(THREAD, loader_oop); 826 Handle h_prot(THREAD, protection_domain); 827 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 828 h_prot, false, THREAD); 829 830 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 831 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 832 } 833 return result; 834 JVM_END 835 836 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 837 jboolean init, jclass from)) 838 JVMWrapper("JVM_FindClassFromClass"); 839 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 840 // It's impossible to create this class; the name cannot fit 841 // into the constant pool. 842 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 843 } 844 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 845 oop from_class_oop = JNIHandles::resolve(from); 846 Klass* from_class = (from_class_oop == NULL) 847 ? (Klass*)NULL 848 : java_lang_Class::as_Klass(from_class_oop); 849 oop class_loader = NULL; 850 oop protection_domain = NULL; 851 if (from_class != NULL) { 852 class_loader = from_class->class_loader(); 853 protection_domain = from_class->protection_domain(); 854 } 855 Handle h_loader(THREAD, class_loader); 856 Handle h_prot (THREAD, protection_domain); 857 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 858 h_prot, true, thread); 859 860 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 861 // this function is generally only used for class loading during verification. 862 ResourceMark rm; 863 oop from_mirror = JNIHandles::resolve_non_null(from); 864 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 865 const char * from_name = from_class->external_name(); 866 867 oop mirror = JNIHandles::resolve_non_null(result); 868 Klass* to_class = java_lang_Class::as_Klass(mirror); 869 const char * to = to_class->external_name(); 870 log_debug(class, resolve)("%s %s (verification)", from_name, to); 871 } 872 873 return result; 874 JVM_END 875 876 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 877 if (loader.is_null()) { 878 return; 879 } 880 881 // check whether the current caller thread holds the lock or not. 882 // If not, increment the corresponding counter 883 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 884 ObjectSynchronizer::owner_self) { 885 counter->inc(); 886 } 887 } 888 889 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 890 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 891 jobject loader, const jbyte *buf, 892 jsize len, jobject pd, const char *source, 893 TRAPS) { 894 if (source == NULL) source = "__JVM_DefineClass__"; 895 896 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 897 JavaThread* jt = (JavaThread*) THREAD; 898 899 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 900 ClassLoader::perf_define_appclass_selftime(), 901 ClassLoader::perf_define_appclasses(), 902 jt->get_thread_stat()->perf_recursion_counts_addr(), 903 jt->get_thread_stat()->perf_timers_addr(), 904 PerfClassTraceTime::DEFINE_CLASS); 905 906 if (UsePerfData) { 907 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 908 } 909 910 // Since exceptions can be thrown, class initialization can take place 911 // if name is NULL no check for class name in .class stream has to be made. 912 TempNewSymbol class_name = NULL; 913 if (name != NULL) { 914 const int str_len = (int)strlen(name); 915 if (str_len > Symbol::max_length()) { 916 // It's impossible to create this class; the name cannot fit 917 // into the constant pool. 918 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 919 } 920 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 921 } 922 923 ResourceMark rm(THREAD); 924 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 925 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 926 if (UsePerfData) { 927 is_lock_held_by_thread(class_loader, 928 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 929 THREAD); 930 } 931 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 932 Klass* k = SystemDictionary::resolve_from_stream(class_name, 933 class_loader, 934 protection_domain, 935 &st, 936 CHECK_NULL); 937 938 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 939 trace_class_resolution(k); 940 } 941 942 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 943 } 944 945 946 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 947 JVMWrapper("JVM_DefineClass"); 948 949 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 950 JVM_END 951 952 953 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 954 JVMWrapper("JVM_DefineClassWithSource"); 955 956 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 957 JVM_END 958 959 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 960 JVMWrapper("JVM_FindLoadedClass"); 961 ResourceMark rm(THREAD); 962 963 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 964 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 965 966 const char* str = java_lang_String::as_utf8_string(string()); 967 // Sanity check, don't expect null 968 if (str == NULL) return NULL; 969 970 const int str_len = (int)strlen(str); 971 if (str_len > Symbol::max_length()) { 972 // It's impossible to create this class; the name cannot fit 973 // into the constant pool. 974 return NULL; 975 } 976 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 977 978 // Security Note: 979 // The Java level wrapper will perform the necessary security check allowing 980 // us to pass the NULL as the initiating class loader. 981 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 982 if (UsePerfData) { 983 is_lock_held_by_thread(h_loader, 984 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 985 THREAD); 986 } 987 988 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 989 h_loader, 990 Handle(), 991 CHECK_NULL); 992 #if INCLUDE_CDS 993 if (k == NULL) { 994 // If the class is not already loaded, try to see if it's in the shared 995 // archive for the current classloader (h_loader). 996 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class( 997 klass_name, h_loader, CHECK_NULL); 998 k = ik(); 999 } 1000 #endif 1001 return (k == NULL) ? NULL : 1002 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1003 JVM_END 1004 1005 // Module support ////////////////////////////////////////////////////////////////////////////// 1006 1007 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jstring version, jstring location, 1008 jobjectArray packages)) 1009 JVMWrapper("JVM_DefineModule"); 1010 Modules::define_module(module, version, location, packages, CHECK); 1011 JVM_END 1012 1013 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1014 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1015 Modules::set_bootloader_unnamed_module(module, CHECK); 1016 JVM_END 1017 1018 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1019 JVMWrapper("JVM_AddModuleExports"); 1020 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1021 JVM_END 1022 1023 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1024 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1025 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1026 JVM_END 1027 1028 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1029 JVMWrapper("JVM_AddModuleExportsToAll"); 1030 Modules::add_module_exports(from_module, package, NULL, CHECK); 1031 JVM_END 1032 1033 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1034 JVMWrapper("JVM_AddReadsModule"); 1035 Modules::add_reads_module(from_module, source_module, CHECK); 1036 JVM_END 1037 1038 JVM_ENTRY(jboolean, JVM_CanReadModule(JNIEnv *env, jobject asking_module, jobject source_module)) 1039 JVMWrapper("JVM_CanReadModule"); 1040 return Modules::can_read_module(asking_module, source_module, THREAD); 1041 JVM_END 1042 1043 JVM_ENTRY(jboolean, JVM_IsExportedToModule(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1044 JVMWrapper("JVM_IsExportedToModule"); 1045 return Modules::is_exported_to_module(from_module, package, to_module, THREAD); 1046 JVM_END 1047 1048 JVM_ENTRY (void, JVM_AddModulePackage(JNIEnv *env, jobject module, jstring package)) 1049 JVMWrapper("JVM_AddModulePackage"); 1050 Modules::add_module_package(module, package, CHECK); 1051 JVM_END 1052 1053 JVM_ENTRY (jobject, JVM_GetModuleByPackageName(JNIEnv *env, jobject loader, jstring package)) 1054 JVMWrapper("JVM_GetModuleByPackageName"); 1055 return Modules::get_module_by_package_name(loader, package, THREAD); 1056 JVM_END 1057 1058 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1059 1060 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1061 assert (cls != NULL, "illegal class"); 1062 JVMWrapper("JVM_GetClassName"); 1063 JvmtiVMObjectAllocEventCollector oam; 1064 ResourceMark rm(THREAD); 1065 const char* name; 1066 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1067 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1068 } else { 1069 // Consider caching interned string in Klass 1070 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1071 assert(k->is_klass(), "just checking"); 1072 name = k->external_name(); 1073 } 1074 oop result = StringTable::intern((char*) name, CHECK_NULL); 1075 return (jstring) JNIHandles::make_local(env, result); 1076 JVM_END 1077 1078 1079 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1080 JVMWrapper("JVM_GetClassInterfaces"); 1081 JvmtiVMObjectAllocEventCollector oam; 1082 oop mirror = JNIHandles::resolve_non_null(cls); 1083 1084 // Special handling for primitive objects 1085 if (java_lang_Class::is_primitive(mirror)) { 1086 // Primitive objects does not have any interfaces 1087 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1088 return (jobjectArray) JNIHandles::make_local(env, r); 1089 } 1090 1091 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror)); 1092 // Figure size of result array 1093 int size; 1094 if (klass->is_instance_klass()) { 1095 size = InstanceKlass::cast(klass())->local_interfaces()->length(); 1096 } else { 1097 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1098 size = 2; 1099 } 1100 1101 // Allocate result array 1102 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1103 objArrayHandle result (THREAD, r); 1104 // Fill in result 1105 if (klass->is_instance_klass()) { 1106 // Regular instance klass, fill in all local interfaces 1107 for (int index = 0; index < size; index++) { 1108 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index); 1109 result->obj_at_put(index, k->java_mirror()); 1110 } 1111 } else { 1112 // All arrays implement java.lang.Cloneable and java.io.Serializable 1113 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1114 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1115 } 1116 return (jobjectArray) JNIHandles::make_local(env, result()); 1117 JVM_END 1118 1119 1120 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1121 JVMWrapper("JVM_IsInterface"); 1122 oop mirror = JNIHandles::resolve_non_null(cls); 1123 if (java_lang_Class::is_primitive(mirror)) { 1124 return JNI_FALSE; 1125 } 1126 Klass* k = java_lang_Class::as_Klass(mirror); 1127 jboolean result = k->is_interface(); 1128 assert(!result || k->is_instance_klass(), 1129 "all interfaces are instance types"); 1130 // The compiler intrinsic for isInterface tests the 1131 // Klass::_access_flags bits in the same way. 1132 return result; 1133 JVM_END 1134 1135 1136 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1137 JVMWrapper("JVM_GetClassSigners"); 1138 JvmtiVMObjectAllocEventCollector oam; 1139 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1140 // There are no signers for primitive types 1141 return NULL; 1142 } 1143 1144 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1145 1146 // If there are no signers set in the class, or if the class 1147 // is an array, return NULL. 1148 if (signers == NULL) return NULL; 1149 1150 // copy of the signers array 1151 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1152 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1153 for (int index = 0; index < signers->length(); index++) { 1154 signers_copy->obj_at_put(index, signers->obj_at(index)); 1155 } 1156 1157 // return the copy 1158 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1159 JVM_END 1160 1161 1162 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1163 JVMWrapper("JVM_SetClassSigners"); 1164 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1165 // This call is ignored for primitive types and arrays. 1166 // Signers are only set once, ClassLoader.java, and thus shouldn't 1167 // be called with an array. Only the bootstrap loader creates arrays. 1168 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1169 if (k->is_instance_klass()) { 1170 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1171 } 1172 } 1173 JVM_END 1174 1175 1176 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1177 JVMWrapper("JVM_GetProtectionDomain"); 1178 if (JNIHandles::resolve(cls) == NULL) { 1179 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1180 } 1181 1182 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1183 // Primitive types does not have a protection domain. 1184 return NULL; 1185 } 1186 1187 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1188 return (jobject) JNIHandles::make_local(env, pd); 1189 JVM_END 1190 1191 1192 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) { 1193 // If there is a security manager and protection domain, check the access 1194 // in the protection domain, otherwise it is authorized. 1195 if (java_lang_System::has_security_manager()) { 1196 1197 // For bootstrapping, if pd implies method isn't in the JDK, allow 1198 // this context to revert to older behavior. 1199 // In this case the isAuthorized field in AccessControlContext is also not 1200 // present. 1201 if (Universe::protection_domain_implies_method() == NULL) { 1202 return true; 1203 } 1204 1205 // Whitelist certain access control contexts 1206 if (java_security_AccessControlContext::is_authorized(context)) { 1207 return true; 1208 } 1209 1210 oop prot = klass->protection_domain(); 1211 if (prot != NULL) { 1212 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1213 // in the new wrapper. 1214 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1215 Handle h_prot(THREAD, prot); 1216 JavaValue result(T_BOOLEAN); 1217 JavaCallArguments args(h_prot); 1218 JavaCalls::call(&result, m, &args, CHECK_false); 1219 return (result.get_jboolean() != 0); 1220 } 1221 } 1222 return true; 1223 } 1224 1225 // Create an AccessControlContext with a protection domain with null codesource 1226 // and null permissions - which gives no permissions. 1227 oop create_dummy_access_control_context(TRAPS) { 1228 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1229 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1230 // Call constructor ProtectionDomain(null, null); 1231 JavaValue result(T_VOID); 1232 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass), 1233 vmSymbols::object_initializer_name(), 1234 vmSymbols::codesource_permissioncollection_signature(), 1235 Handle(), Handle(), CHECK_NULL); 1236 1237 // new ProtectionDomain[] {pd}; 1238 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1239 context->obj_at_put(0, obj()); 1240 1241 // new AccessControlContext(new ProtectionDomain[] {pd}) 1242 objArrayHandle h_context(THREAD, context); 1243 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1244 return acc; 1245 } 1246 1247 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1248 JVMWrapper("JVM_DoPrivileged"); 1249 1250 if (action == NULL) { 1251 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1252 } 1253 1254 // Compute the frame initiating the do privileged operation and setup the privileged stack 1255 vframeStream vfst(thread); 1256 vfst.security_get_caller_frame(1); 1257 1258 if (vfst.at_end()) { 1259 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1260 } 1261 1262 Method* method = vfst.method(); 1263 instanceKlassHandle klass (THREAD, method->method_holder()); 1264 1265 // Check that action object understands "Object run()" 1266 Handle h_context; 1267 if (context != NULL) { 1268 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1269 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1270 if (!authorized) { 1271 // Create an unprivileged access control object and call it's run function 1272 // instead. 1273 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1274 h_context = Handle(THREAD, noprivs); 1275 } 1276 } 1277 1278 // Check that action object understands "Object run()" 1279 Handle object (THREAD, JNIHandles::resolve(action)); 1280 1281 // get run() method 1282 Method* m_oop = object->klass()->uncached_lookup_method( 1283 vmSymbols::run_method_name(), 1284 vmSymbols::void_object_signature(), 1285 Klass::find_overpass); 1286 methodHandle m (THREAD, m_oop); 1287 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { 1288 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1289 } 1290 1291 // Stack allocated list of privileged stack elements 1292 PrivilegedElement pi; 1293 if (!vfst.at_end()) { 1294 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1295 thread->set_privileged_stack_top(&pi); 1296 } 1297 1298 1299 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1300 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1301 Handle pending_exception; 1302 JavaValue result(T_OBJECT); 1303 JavaCallArguments args(object); 1304 JavaCalls::call(&result, m, &args, THREAD); 1305 1306 // done with action, remove ourselves from the list 1307 if (!vfst.at_end()) { 1308 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1309 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1310 } 1311 1312 if (HAS_PENDING_EXCEPTION) { 1313 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1314 CLEAR_PENDING_EXCEPTION; 1315 // JVMTI has already reported the pending exception 1316 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1317 if (THREAD->is_Java_thread()) { 1318 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1319 } 1320 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1321 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1322 // Throw a java.security.PrivilegedActionException(Exception e) exception 1323 JavaCallArguments args(pending_exception); 1324 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1325 vmSymbols::exception_void_signature(), 1326 &args); 1327 } 1328 } 1329 1330 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1331 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1332 JVM_END 1333 1334 1335 // Returns the inherited_access_control_context field of the running thread. 1336 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1337 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1338 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1339 return JNIHandles::make_local(env, result); 1340 JVM_END 1341 1342 class RegisterArrayForGC { 1343 private: 1344 JavaThread *_thread; 1345 public: 1346 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1347 _thread = thread; 1348 _thread->register_array_for_gc(array); 1349 } 1350 1351 ~RegisterArrayForGC() { 1352 _thread->register_array_for_gc(NULL); 1353 } 1354 }; 1355 1356 1357 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1358 JVMWrapper("JVM_GetStackAccessControlContext"); 1359 if (!UsePrivilegedStack) return NULL; 1360 1361 ResourceMark rm(THREAD); 1362 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1363 JvmtiVMObjectAllocEventCollector oam; 1364 1365 // count the protection domains on the execution stack. We collapse 1366 // duplicate consecutive protection domains into a single one, as 1367 // well as stopping when we hit a privileged frame. 1368 1369 // Use vframeStream to iterate through Java frames 1370 vframeStream vfst(thread); 1371 1372 oop previous_protection_domain = NULL; 1373 Handle privileged_context(thread, NULL); 1374 bool is_privileged = false; 1375 oop protection_domain = NULL; 1376 1377 for(; !vfst.at_end(); vfst.next()) { 1378 // get method of frame 1379 Method* method = vfst.method(); 1380 intptr_t* frame_id = vfst.frame_id(); 1381 1382 // check the privileged frames to see if we have a match 1383 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1384 // this frame is privileged 1385 is_privileged = true; 1386 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1387 protection_domain = thread->privileged_stack_top()->protection_domain(); 1388 } else { 1389 protection_domain = method->method_holder()->protection_domain(); 1390 } 1391 1392 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1393 local_array->push(protection_domain); 1394 previous_protection_domain = protection_domain; 1395 } 1396 1397 if (is_privileged) break; 1398 } 1399 1400 1401 // either all the domains on the stack were system domains, or 1402 // we had a privileged system domain 1403 if (local_array->is_empty()) { 1404 if (is_privileged && privileged_context.is_null()) return NULL; 1405 1406 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1407 return JNIHandles::make_local(env, result); 1408 } 1409 1410 // the resource area must be registered in case of a gc 1411 RegisterArrayForGC ragc(thread, local_array); 1412 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1413 local_array->length(), CHECK_NULL); 1414 objArrayHandle h_context(thread, context); 1415 for (int index = 0; index < local_array->length(); index++) { 1416 h_context->obj_at_put(index, local_array->at(index)); 1417 } 1418 1419 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1420 1421 return JNIHandles::make_local(env, result); 1422 JVM_END 1423 1424 1425 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1426 JVMWrapper("JVM_IsArrayClass"); 1427 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1428 return (k != NULL) && k->is_array_klass() ? true : false; 1429 JVM_END 1430 1431 1432 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1433 JVMWrapper("JVM_IsPrimitiveClass"); 1434 oop mirror = JNIHandles::resolve_non_null(cls); 1435 return (jboolean) java_lang_Class::is_primitive(mirror); 1436 JVM_END 1437 1438 1439 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1440 JVMWrapper("JVM_GetClassModifiers"); 1441 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1442 // Primitive type 1443 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1444 } 1445 1446 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1447 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1448 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1449 return k->modifier_flags(); 1450 JVM_END 1451 1452 1453 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1454 1455 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1456 JvmtiVMObjectAllocEventCollector oam; 1457 // ofClass is a reference to a java_lang_Class object. The mirror object 1458 // of an InstanceKlass 1459 1460 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1461 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1462 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1463 return (jobjectArray)JNIHandles::make_local(env, result); 1464 } 1465 1466 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1467 InnerClassesIterator iter(k); 1468 1469 if (iter.length() == 0) { 1470 // Neither an inner nor outer class 1471 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1472 return (jobjectArray)JNIHandles::make_local(env, result); 1473 } 1474 1475 // find inner class info 1476 constantPoolHandle cp(thread, k->constants()); 1477 int length = iter.length(); 1478 1479 // Allocate temp. result array 1480 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1481 objArrayHandle result (THREAD, r); 1482 int members = 0; 1483 1484 for (; !iter.done(); iter.next()) { 1485 int ioff = iter.inner_class_info_index(); 1486 int ooff = iter.outer_class_info_index(); 1487 1488 if (ioff != 0 && ooff != 0) { 1489 // Check to see if the name matches the class we're looking for 1490 // before attempting to find the class. 1491 if (cp->klass_name_at_matches(k, ooff)) { 1492 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1493 if (outer_klass == k()) { 1494 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1495 instanceKlassHandle inner_klass (THREAD, ik); 1496 1497 // Throws an exception if outer klass has not declared k as 1498 // an inner klass 1499 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1500 1501 result->obj_at_put(members, inner_klass->java_mirror()); 1502 members++; 1503 } 1504 } 1505 } 1506 } 1507 1508 if (members != length) { 1509 // Return array of right length 1510 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1511 for(int i = 0; i < members; i++) { 1512 res->obj_at_put(i, result->obj_at(i)); 1513 } 1514 return (jobjectArray)JNIHandles::make_local(env, res); 1515 } 1516 1517 return (jobjectArray)JNIHandles::make_local(env, result()); 1518 JVM_END 1519 1520 1521 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1522 { 1523 // ofClass is a reference to a java_lang_Class object. 1524 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1525 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1526 return NULL; 1527 } 1528 1529 bool inner_is_member = false; 1530 Klass* outer_klass 1531 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1532 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1533 if (outer_klass == NULL) return NULL; // already a top-level class 1534 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1535 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1536 } 1537 JVM_END 1538 1539 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1540 { 1541 oop mirror = JNIHandles::resolve_non_null(cls); 1542 if (java_lang_Class::is_primitive(mirror) || 1543 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1544 return NULL; 1545 } 1546 instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror))); 1547 int ooff = 0, noff = 0; 1548 if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) { 1549 if (noff != 0) { 1550 constantPoolHandle i_cp(thread, k->constants()); 1551 Symbol* name = i_cp->symbol_at(noff); 1552 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1553 return (jstring) JNIHandles::make_local(env, str()); 1554 } 1555 } 1556 return NULL; 1557 } 1558 JVM_END 1559 1560 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1561 assert (cls != NULL, "illegal class"); 1562 JVMWrapper("JVM_GetClassSignature"); 1563 JvmtiVMObjectAllocEventCollector oam; 1564 ResourceMark rm(THREAD); 1565 // Return null for arrays and primatives 1566 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1567 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1568 if (k->is_instance_klass()) { 1569 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1570 if (sym == NULL) return NULL; 1571 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1572 return (jstring) JNIHandles::make_local(env, str()); 1573 } 1574 } 1575 return NULL; 1576 JVM_END 1577 1578 1579 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1580 assert (cls != NULL, "illegal class"); 1581 JVMWrapper("JVM_GetClassAnnotations"); 1582 1583 // Return null for arrays and primitives 1584 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1585 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1586 if (k->is_instance_klass()) { 1587 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1588 return (jbyteArray) JNIHandles::make_local(env, a); 1589 } 1590 } 1591 return NULL; 1592 JVM_END 1593 1594 1595 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1596 // some of this code was adapted from from jni_FromReflectedField 1597 1598 oop reflected = JNIHandles::resolve_non_null(field); 1599 oop mirror = java_lang_reflect_Field::clazz(reflected); 1600 Klass* k = java_lang_Class::as_Klass(mirror); 1601 int slot = java_lang_reflect_Field::slot(reflected); 1602 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1603 1604 KlassHandle kh(THREAD, k); 1605 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot); 1606 1607 if (modifiers & JVM_ACC_STATIC) { 1608 // for static fields we only look in the current class 1609 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) { 1610 assert(false, "cannot find static field"); 1611 return false; 1612 } 1613 } else { 1614 // for instance fields we start with the current class and work 1615 // our way up through the superclass chain 1616 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) { 1617 assert(false, "cannot find instance field"); 1618 return false; 1619 } 1620 } 1621 return true; 1622 } 1623 1624 static Method* jvm_get_method_common(jobject method) { 1625 // some of this code was adapted from from jni_FromReflectedMethod 1626 1627 oop reflected = JNIHandles::resolve_non_null(method); 1628 oop mirror = NULL; 1629 int slot = 0; 1630 1631 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1632 mirror = java_lang_reflect_Constructor::clazz(reflected); 1633 slot = java_lang_reflect_Constructor::slot(reflected); 1634 } else { 1635 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1636 "wrong type"); 1637 mirror = java_lang_reflect_Method::clazz(reflected); 1638 slot = java_lang_reflect_Method::slot(reflected); 1639 } 1640 Klass* k = java_lang_Class::as_Klass(mirror); 1641 1642 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1643 assert(m != NULL, "cannot find method"); 1644 return m; // caller has to deal with NULL in product mode 1645 } 1646 1647 /* Type use annotations support (JDK 1.8) */ 1648 1649 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1650 assert (cls != NULL, "illegal class"); 1651 JVMWrapper("JVM_GetClassTypeAnnotations"); 1652 ResourceMark rm(THREAD); 1653 // Return null for arrays and primitives 1654 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1655 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1656 if (k->is_instance_klass()) { 1657 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1658 if (type_annotations != NULL) { 1659 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1660 return (jbyteArray) JNIHandles::make_local(env, a); 1661 } 1662 } 1663 } 1664 return NULL; 1665 JVM_END 1666 1667 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1668 assert (method != NULL, "illegal method"); 1669 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1670 1671 // method is a handle to a java.lang.reflect.Method object 1672 Method* m = jvm_get_method_common(method); 1673 if (m == NULL) { 1674 return NULL; 1675 } 1676 1677 AnnotationArray* type_annotations = m->type_annotations(); 1678 if (type_annotations != NULL) { 1679 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1680 return (jbyteArray) JNIHandles::make_local(env, a); 1681 } 1682 1683 return NULL; 1684 JVM_END 1685 1686 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1687 assert (field != NULL, "illegal field"); 1688 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1689 1690 fieldDescriptor fd; 1691 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1692 if (!gotFd) { 1693 return NULL; 1694 } 1695 1696 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1697 JVM_END 1698 1699 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { 1700 if (!cp->is_within_bounds(index)) { 1701 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1702 } 1703 } 1704 1705 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1706 { 1707 JVMWrapper("JVM_GetMethodParameters"); 1708 // method is a handle to a java.lang.reflect.Method object 1709 Method* method_ptr = jvm_get_method_common(method); 1710 methodHandle mh (THREAD, method_ptr); 1711 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1712 const int num_params = mh->method_parameters_length(); 1713 1714 if (num_params < 0) { 1715 // A -1 return value from method_parameters_length means there is no 1716 // parameter data. Return null to indicate this to the reflection 1717 // API. 1718 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1719 return (jobjectArray)NULL; 1720 } else { 1721 // Otherwise, we return something up to reflection, even if it is 1722 // a zero-length array. Why? Because in some cases this can 1723 // trigger a MalformedParametersException. 1724 1725 // make sure all the symbols are properly formatted 1726 for (int i = 0; i < num_params; i++) { 1727 MethodParametersElement* params = mh->method_parameters_start(); 1728 int index = params[i].name_cp_index; 1729 bounds_check(mh->constants(), index, CHECK_NULL); 1730 1731 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1732 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1733 "Wrong type at constant pool index"); 1734 } 1735 1736 } 1737 1738 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1739 objArrayHandle result (THREAD, result_oop); 1740 1741 for (int i = 0; i < num_params; i++) { 1742 MethodParametersElement* params = mh->method_parameters_start(); 1743 // For a 0 index, give a NULL symbol 1744 Symbol* sym = 0 != params[i].name_cp_index ? 1745 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1746 int flags = params[i].flags; 1747 oop param = Reflection::new_parameter(reflected_method, i, sym, 1748 flags, CHECK_NULL); 1749 result->obj_at_put(i, param); 1750 } 1751 return (jobjectArray)JNIHandles::make_local(env, result()); 1752 } 1753 } 1754 JVM_END 1755 1756 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1757 1758 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1759 { 1760 JVMWrapper("JVM_GetClassDeclaredFields"); 1761 JvmtiVMObjectAllocEventCollector oam; 1762 1763 // Exclude primitive types and array types 1764 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1765 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1766 // Return empty array 1767 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1768 return (jobjectArray) JNIHandles::make_local(env, res); 1769 } 1770 1771 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1772 constantPoolHandle cp(THREAD, k->constants()); 1773 1774 // Ensure class is linked 1775 k->link_class(CHECK_NULL); 1776 1777 // Allocate result 1778 int num_fields; 1779 1780 if (publicOnly) { 1781 num_fields = 0; 1782 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) { 1783 if (fs.access_flags().is_public()) ++num_fields; 1784 } 1785 } else { 1786 num_fields = k->java_fields_count(); 1787 } 1788 1789 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1790 objArrayHandle result (THREAD, r); 1791 1792 int out_idx = 0; 1793 fieldDescriptor fd; 1794 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1795 if (!publicOnly || fs.access_flags().is_public()) { 1796 fd.reinitialize(k(), fs.index()); 1797 oop field = Reflection::new_field(&fd, CHECK_NULL); 1798 result->obj_at_put(out_idx, field); 1799 ++out_idx; 1800 } 1801 } 1802 assert(out_idx == num_fields, "just checking"); 1803 return (jobjectArray) JNIHandles::make_local(env, result()); 1804 } 1805 JVM_END 1806 1807 static bool select_method(methodHandle method, bool want_constructor) { 1808 if (want_constructor) { 1809 return (method->is_initializer() && !method->is_static()); 1810 } else { 1811 return (!method->is_initializer() && !method->is_overpass()); 1812 } 1813 } 1814 1815 static jobjectArray get_class_declared_methods_helper( 1816 JNIEnv *env, 1817 jclass ofClass, jboolean publicOnly, 1818 bool want_constructor, 1819 Klass* klass, TRAPS) { 1820 1821 JvmtiVMObjectAllocEventCollector oam; 1822 1823 // Exclude primitive types and array types 1824 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1825 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1826 // Return empty array 1827 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1828 return (jobjectArray) JNIHandles::make_local(env, res); 1829 } 1830 1831 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1832 1833 // Ensure class is linked 1834 k->link_class(CHECK_NULL); 1835 1836 Array<Method*>* methods = k->methods(); 1837 int methods_length = methods->length(); 1838 1839 // Save original method_idnum in case of redefinition, which can change 1840 // the idnum of obsolete methods. The new method will have the same idnum 1841 // but if we refresh the methods array, the counts will be wrong. 1842 ResourceMark rm(THREAD); 1843 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1844 int num_methods = 0; 1845 1846 for (int i = 0; i < methods_length; i++) { 1847 methodHandle method(THREAD, methods->at(i)); 1848 if (select_method(method, want_constructor)) { 1849 if (!publicOnly || method->is_public()) { 1850 idnums->push(method->method_idnum()); 1851 ++num_methods; 1852 } 1853 } 1854 } 1855 1856 // Allocate result 1857 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1858 objArrayHandle result (THREAD, r); 1859 1860 // Now just put the methods that we selected above, but go by their idnum 1861 // in case of redefinition. The methods can be redefined at any safepoint, 1862 // so above when allocating the oop array and below when creating reflect 1863 // objects. 1864 for (int i = 0; i < num_methods; i++) { 1865 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1866 if (method.is_null()) { 1867 // Method may have been deleted and seems this API can handle null 1868 // Otherwise should probably put a method that throws NSME 1869 result->obj_at_put(i, NULL); 1870 } else { 1871 oop m; 1872 if (want_constructor) { 1873 m = Reflection::new_constructor(method, CHECK_NULL); 1874 } else { 1875 m = Reflection::new_method(method, false, CHECK_NULL); 1876 } 1877 result->obj_at_put(i, m); 1878 } 1879 } 1880 1881 return (jobjectArray) JNIHandles::make_local(env, result()); 1882 } 1883 1884 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1885 { 1886 JVMWrapper("JVM_GetClassDeclaredMethods"); 1887 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1888 /*want_constructor*/ false, 1889 SystemDictionary::reflect_Method_klass(), THREAD); 1890 } 1891 JVM_END 1892 1893 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1894 { 1895 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1896 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1897 /*want_constructor*/ true, 1898 SystemDictionary::reflect_Constructor_klass(), THREAD); 1899 } 1900 JVM_END 1901 1902 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1903 { 1904 JVMWrapper("JVM_GetClassAccessFlags"); 1905 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1906 // Primitive type 1907 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1908 } 1909 1910 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1911 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1912 } 1913 JVM_END 1914 1915 1916 // Constant pool access ////////////////////////////////////////////////////////// 1917 1918 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1919 { 1920 JVMWrapper("JVM_GetClassConstantPool"); 1921 JvmtiVMObjectAllocEventCollector oam; 1922 1923 // Return null for primitives and arrays 1924 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1925 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1926 if (k->is_instance_klass()) { 1927 instanceKlassHandle k_h(THREAD, k); 1928 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1929 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1930 return JNIHandles::make_local(jcp()); 1931 } 1932 } 1933 return NULL; 1934 } 1935 JVM_END 1936 1937 1938 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1939 { 1940 JVMWrapper("JVM_ConstantPoolGetSize"); 1941 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1942 return cp->length(); 1943 } 1944 JVM_END 1945 1946 1947 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1948 { 1949 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1950 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1951 bounds_check(cp, index, CHECK_NULL); 1952 constantTag tag = cp->tag_at(index); 1953 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1954 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1955 } 1956 Klass* k = cp->klass_at(index, CHECK_NULL); 1957 return (jclass) JNIHandles::make_local(k->java_mirror()); 1958 } 1959 JVM_END 1960 1961 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1962 { 1963 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1964 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1965 bounds_check(cp, index, CHECK_NULL); 1966 constantTag tag = cp->tag_at(index); 1967 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1968 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1969 } 1970 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1971 if (k == NULL) return NULL; 1972 return (jclass) JNIHandles::make_local(k->java_mirror()); 1973 } 1974 JVM_END 1975 1976 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1977 constantTag tag = cp->tag_at(index); 1978 if (!tag.is_method() && !tag.is_interface_method()) { 1979 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1980 } 1981 int klass_ref = cp->uncached_klass_ref_index_at(index); 1982 Klass* k_o; 1983 if (force_resolution) { 1984 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1985 } else { 1986 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1987 if (k_o == NULL) return NULL; 1988 } 1989 instanceKlassHandle k(THREAD, k_o); 1990 Symbol* name = cp->uncached_name_ref_at(index); 1991 Symbol* sig = cp->uncached_signature_ref_at(index); 1992 methodHandle m (THREAD, k->find_method(name, sig)); 1993 if (m.is_null()) { 1994 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1995 } 1996 oop method; 1997 if (!m->is_initializer() || m->is_static()) { 1998 method = Reflection::new_method(m, true, CHECK_NULL); 1999 } else { 2000 method = Reflection::new_constructor(m, CHECK_NULL); 2001 } 2002 return JNIHandles::make_local(method); 2003 } 2004 2005 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2006 { 2007 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 2008 JvmtiVMObjectAllocEventCollector oam; 2009 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2010 bounds_check(cp, index, CHECK_NULL); 2011 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2012 return res; 2013 } 2014 JVM_END 2015 2016 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2017 { 2018 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2019 JvmtiVMObjectAllocEventCollector oam; 2020 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2021 bounds_check(cp, index, CHECK_NULL); 2022 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2023 return res; 2024 } 2025 JVM_END 2026 2027 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2028 constantTag tag = cp->tag_at(index); 2029 if (!tag.is_field()) { 2030 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2031 } 2032 int klass_ref = cp->uncached_klass_ref_index_at(index); 2033 Klass* k_o; 2034 if (force_resolution) { 2035 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2036 } else { 2037 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2038 if (k_o == NULL) return NULL; 2039 } 2040 instanceKlassHandle k(THREAD, k_o); 2041 Symbol* name = cp->uncached_name_ref_at(index); 2042 Symbol* sig = cp->uncached_signature_ref_at(index); 2043 fieldDescriptor fd; 2044 Klass* target_klass = k->find_field(name, sig, &fd); 2045 if (target_klass == NULL) { 2046 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2047 } 2048 oop field = Reflection::new_field(&fd, CHECK_NULL); 2049 return JNIHandles::make_local(field); 2050 } 2051 2052 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2053 { 2054 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2055 JvmtiVMObjectAllocEventCollector oam; 2056 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2057 bounds_check(cp, index, CHECK_NULL); 2058 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2059 return res; 2060 } 2061 JVM_END 2062 2063 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2064 { 2065 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2066 JvmtiVMObjectAllocEventCollector oam; 2067 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2068 bounds_check(cp, index, CHECK_NULL); 2069 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2070 return res; 2071 } 2072 JVM_END 2073 2074 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2075 { 2076 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2077 JvmtiVMObjectAllocEventCollector oam; 2078 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2079 bounds_check(cp, index, CHECK_NULL); 2080 constantTag tag = cp->tag_at(index); 2081 if (!tag.is_field_or_method()) { 2082 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2083 } 2084 int klass_ref = cp->uncached_klass_ref_index_at(index); 2085 Symbol* klass_name = cp->klass_name_at(klass_ref); 2086 Symbol* member_name = cp->uncached_name_ref_at(index); 2087 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2088 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2089 objArrayHandle dest(THREAD, dest_o); 2090 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2091 dest->obj_at_put(0, str()); 2092 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2093 dest->obj_at_put(1, str()); 2094 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2095 dest->obj_at_put(2, str()); 2096 return (jobjectArray) JNIHandles::make_local(dest()); 2097 } 2098 JVM_END 2099 2100 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2101 { 2102 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2103 JvmtiVMObjectAllocEventCollector oam; 2104 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2105 bounds_check(cp, index, CHECK_0); 2106 constantTag tag = cp->tag_at(index); 2107 if (!tag.is_field_or_method()) { 2108 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2109 } 2110 return (jint) cp->uncached_klass_ref_index_at(index); 2111 } 2112 JVM_END 2113 2114 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2115 { 2116 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2117 JvmtiVMObjectAllocEventCollector oam; 2118 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2119 bounds_check(cp, index, CHECK_0); 2120 constantTag tag = cp->tag_at(index); 2121 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2122 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2123 } 2124 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2125 } 2126 JVM_END 2127 2128 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2129 { 2130 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2131 JvmtiVMObjectAllocEventCollector oam; 2132 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2133 bounds_check(cp, index, CHECK_NULL); 2134 constantTag tag = cp->tag_at(index); 2135 if (!tag.is_name_and_type()) { 2136 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2137 } 2138 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2139 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2140 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2141 objArrayHandle dest(THREAD, dest_o); 2142 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2143 dest->obj_at_put(0, str()); 2144 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2145 dest->obj_at_put(1, str()); 2146 return (jobjectArray) JNIHandles::make_local(dest()); 2147 } 2148 JVM_END 2149 2150 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2151 { 2152 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2154 bounds_check(cp, index, CHECK_0); 2155 constantTag tag = cp->tag_at(index); 2156 if (!tag.is_int()) { 2157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2158 } 2159 return cp->int_at(index); 2160 } 2161 JVM_END 2162 2163 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2164 { 2165 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2166 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2167 bounds_check(cp, index, CHECK_(0L)); 2168 constantTag tag = cp->tag_at(index); 2169 if (!tag.is_long()) { 2170 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2171 } 2172 return cp->long_at(index); 2173 } 2174 JVM_END 2175 2176 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2177 { 2178 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2179 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2180 bounds_check(cp, index, CHECK_(0.0f)); 2181 constantTag tag = cp->tag_at(index); 2182 if (!tag.is_float()) { 2183 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2184 } 2185 return cp->float_at(index); 2186 } 2187 JVM_END 2188 2189 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2190 { 2191 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2192 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2193 bounds_check(cp, index, CHECK_(0.0)); 2194 constantTag tag = cp->tag_at(index); 2195 if (!tag.is_double()) { 2196 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2197 } 2198 return cp->double_at(index); 2199 } 2200 JVM_END 2201 2202 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2203 { 2204 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2205 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2206 bounds_check(cp, index, CHECK_NULL); 2207 constantTag tag = cp->tag_at(index); 2208 if (!tag.is_string()) { 2209 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2210 } 2211 oop str = cp->string_at(index, CHECK_NULL); 2212 return (jstring) JNIHandles::make_local(str); 2213 } 2214 JVM_END 2215 2216 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2217 { 2218 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2219 JvmtiVMObjectAllocEventCollector oam; 2220 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2221 bounds_check(cp, index, CHECK_NULL); 2222 constantTag tag = cp->tag_at(index); 2223 if (!tag.is_symbol()) { 2224 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2225 } 2226 Symbol* sym = cp->symbol_at(index); 2227 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2228 return (jstring) JNIHandles::make_local(str()); 2229 } 2230 JVM_END 2231 2232 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2233 { 2234 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2235 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2236 bounds_check(cp, index, CHECK_0); 2237 constantTag tag = cp->tag_at(index); 2238 jbyte result = tag.value(); 2239 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2240 // they are changed to the corresponding tags from the JVM spec, so that java code in 2241 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2242 if (tag.is_klass_or_reference()) { 2243 result = JVM_CONSTANT_Class; 2244 } else if (tag.is_string_index()) { 2245 result = JVM_CONSTANT_String; 2246 } else if (tag.is_method_type_in_error()) { 2247 result = JVM_CONSTANT_MethodType; 2248 } else if (tag.is_method_handle_in_error()) { 2249 result = JVM_CONSTANT_MethodHandle; 2250 } 2251 return result; 2252 } 2253 JVM_END 2254 2255 // Assertion support. ////////////////////////////////////////////////////////// 2256 2257 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2258 JVMWrapper("JVM_DesiredAssertionStatus"); 2259 assert(cls != NULL, "bad class"); 2260 2261 oop r = JNIHandles::resolve(cls); 2262 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2263 if (java_lang_Class::is_primitive(r)) return false; 2264 2265 Klass* k = java_lang_Class::as_Klass(r); 2266 assert(k->is_instance_klass(), "must be an instance klass"); 2267 if (!k->is_instance_klass()) return false; 2268 2269 ResourceMark rm(THREAD); 2270 const char* name = k->name()->as_C_string(); 2271 bool system_class = k->class_loader() == NULL; 2272 return JavaAssertions::enabled(name, system_class); 2273 2274 JVM_END 2275 2276 2277 // Return a new AssertionStatusDirectives object with the fields filled in with 2278 // command-line assertion arguments (i.e., -ea, -da). 2279 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2280 JVMWrapper("JVM_AssertionStatusDirectives"); 2281 JvmtiVMObjectAllocEventCollector oam; 2282 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2283 return JNIHandles::make_local(env, asd); 2284 JVM_END 2285 2286 // Verification //////////////////////////////////////////////////////////////////////////////// 2287 2288 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2289 2290 // RedefineClasses support: bug 6214132 caused verification to fail. 2291 // All functions from this section should call the jvmtiThreadSate function: 2292 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2293 // The function returns a Klass* of the _scratch_class if the verifier 2294 // was invoked in the middle of the class redefinition. 2295 // Otherwise it returns its argument value which is the _the_class Klass*. 2296 // Please, refer to the description in the jvmtiThreadSate.hpp. 2297 2298 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2299 JVMWrapper("JVM_GetClassNameUTF"); 2300 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2301 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2302 return k->name()->as_utf8(); 2303 JVM_END 2304 2305 2306 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2307 JVMWrapper("JVM_GetClassCPTypes"); 2308 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2309 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2310 // types will have length zero if this is not an InstanceKlass 2311 // (length is determined by call to JVM_GetClassCPEntriesCount) 2312 if (k->is_instance_klass()) { 2313 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2314 for (int index = cp->length() - 1; index >= 0; index--) { 2315 constantTag tag = cp->tag_at(index); 2316 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2317 } 2318 } 2319 JVM_END 2320 2321 2322 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2323 JVMWrapper("JVM_GetClassCPEntriesCount"); 2324 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2325 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2326 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2327 JVM_END 2328 2329 2330 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2331 JVMWrapper("JVM_GetClassFieldsCount"); 2332 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2333 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2334 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2335 JVM_END 2336 2337 2338 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2339 JVMWrapper("JVM_GetClassMethodsCount"); 2340 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2341 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2342 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2343 JVM_END 2344 2345 2346 // The following methods, used for the verifier, are never called with 2347 // array klasses, so a direct cast to InstanceKlass is safe. 2348 // Typically, these methods are called in a loop with bounds determined 2349 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2350 // zero for arrays. 2351 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2352 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2353 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2354 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2355 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2356 int length = method->checked_exceptions_length(); 2357 if (length > 0) { 2358 CheckedExceptionElement* table= method->checked_exceptions_start(); 2359 for (int i = 0; i < length; i++) { 2360 exceptions[i] = table[i].class_cp_index; 2361 } 2362 } 2363 JVM_END 2364 2365 2366 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2367 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2368 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2369 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2370 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2371 return method->checked_exceptions_length(); 2372 JVM_END 2373 2374 2375 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2376 JVMWrapper("JVM_GetMethodIxByteCode"); 2377 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2378 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2379 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2380 memcpy(code, method->code_base(), method->code_size()); 2381 JVM_END 2382 2383 2384 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2385 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2386 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2387 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2388 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2389 return method->code_size(); 2390 JVM_END 2391 2392 2393 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2394 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2395 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2396 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2397 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2398 ExceptionTable extable(method); 2399 entry->start_pc = extable.start_pc(entry_index); 2400 entry->end_pc = extable.end_pc(entry_index); 2401 entry->handler_pc = extable.handler_pc(entry_index); 2402 entry->catchType = extable.catch_type_index(entry_index); 2403 JVM_END 2404 2405 2406 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2407 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2408 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2409 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2410 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2411 return method->exception_table_length(); 2412 JVM_END 2413 2414 2415 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2416 JVMWrapper("JVM_GetMethodIxModifiers"); 2417 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2418 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2419 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2420 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2421 JVM_END 2422 2423 2424 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2425 JVMWrapper("JVM_GetFieldIxModifiers"); 2426 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2427 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2428 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2429 JVM_END 2430 2431 2432 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2433 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2434 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2435 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2436 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2437 return method->max_locals(); 2438 JVM_END 2439 2440 2441 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2442 JVMWrapper("JVM_GetMethodIxArgsSize"); 2443 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2444 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2445 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2446 return method->size_of_parameters(); 2447 JVM_END 2448 2449 2450 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2451 JVMWrapper("JVM_GetMethodIxMaxStack"); 2452 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2453 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2454 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2455 return method->verifier_max_stack(); 2456 JVM_END 2457 2458 2459 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2460 JVMWrapper("JVM_IsConstructorIx"); 2461 ResourceMark rm(THREAD); 2462 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2463 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2464 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2465 return method->name() == vmSymbols::object_initializer_name(); 2466 JVM_END 2467 2468 2469 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2470 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2471 ResourceMark rm(THREAD); 2472 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2473 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2474 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2475 return method->is_overpass(); 2476 JVM_END 2477 2478 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2479 JVMWrapper("JVM_GetMethodIxIxUTF"); 2480 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2481 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2482 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2483 return method->name()->as_utf8(); 2484 JVM_END 2485 2486 2487 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2488 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2489 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2490 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2491 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2492 return method->signature()->as_utf8(); 2493 JVM_END 2494 2495 /** 2496 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2497 * read entries in the constant pool. Since the old verifier always 2498 * works on a copy of the code, it will not see any rewriting that 2499 * may possibly occur in the middle of verification. So it is important 2500 * that nothing it calls tries to use the cpCache instead of the raw 2501 * constant pool, so we must use cp->uncached_x methods when appropriate. 2502 */ 2503 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2504 JVMWrapper("JVM_GetCPFieldNameUTF"); 2505 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2506 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2507 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2508 switch (cp->tag_at(cp_index).value()) { 2509 case JVM_CONSTANT_Fieldref: 2510 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2511 default: 2512 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2513 } 2514 ShouldNotReachHere(); 2515 return NULL; 2516 JVM_END 2517 2518 2519 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2520 JVMWrapper("JVM_GetCPMethodNameUTF"); 2521 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2522 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2523 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2524 switch (cp->tag_at(cp_index).value()) { 2525 case JVM_CONSTANT_InterfaceMethodref: 2526 case JVM_CONSTANT_Methodref: 2527 case JVM_CONSTANT_NameAndType: // for invokedynamic 2528 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2529 default: 2530 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2531 } 2532 ShouldNotReachHere(); 2533 return NULL; 2534 JVM_END 2535 2536 2537 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2538 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2539 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2540 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2541 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2542 switch (cp->tag_at(cp_index).value()) { 2543 case JVM_CONSTANT_InterfaceMethodref: 2544 case JVM_CONSTANT_Methodref: 2545 case JVM_CONSTANT_NameAndType: // for invokedynamic 2546 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2547 default: 2548 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2549 } 2550 ShouldNotReachHere(); 2551 return NULL; 2552 JVM_END 2553 2554 2555 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2556 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2557 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2558 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2559 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2560 switch (cp->tag_at(cp_index).value()) { 2561 case JVM_CONSTANT_Fieldref: 2562 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2563 default: 2564 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2565 } 2566 ShouldNotReachHere(); 2567 return NULL; 2568 JVM_END 2569 2570 2571 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2572 JVMWrapper("JVM_GetCPClassNameUTF"); 2573 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2574 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2575 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2576 Symbol* classname = cp->klass_name_at(cp_index); 2577 return classname->as_utf8(); 2578 JVM_END 2579 2580 2581 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2582 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2583 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2584 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2585 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2586 switch (cp->tag_at(cp_index).value()) { 2587 case JVM_CONSTANT_Fieldref: { 2588 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2589 Symbol* classname = cp->klass_name_at(class_index); 2590 return classname->as_utf8(); 2591 } 2592 default: 2593 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2594 } 2595 ShouldNotReachHere(); 2596 return NULL; 2597 JVM_END 2598 2599 2600 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2601 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2603 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2604 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2605 switch (cp->tag_at(cp_index).value()) { 2606 case JVM_CONSTANT_Methodref: 2607 case JVM_CONSTANT_InterfaceMethodref: { 2608 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2609 Symbol* classname = cp->klass_name_at(class_index); 2610 return classname->as_utf8(); 2611 } 2612 default: 2613 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2614 } 2615 ShouldNotReachHere(); 2616 return NULL; 2617 JVM_END 2618 2619 2620 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2621 JVMWrapper("JVM_GetCPFieldModifiers"); 2622 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2623 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2624 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2625 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2626 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2627 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2628 switch (cp->tag_at(cp_index).value()) { 2629 case JVM_CONSTANT_Fieldref: { 2630 Symbol* name = cp->uncached_name_ref_at(cp_index); 2631 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2632 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) { 2633 if (fs.name() == name && fs.signature() == signature) { 2634 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2635 } 2636 } 2637 return -1; 2638 } 2639 default: 2640 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2641 } 2642 ShouldNotReachHere(); 2643 return 0; 2644 JVM_END 2645 2646 2647 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2648 JVMWrapper("JVM_GetCPMethodModifiers"); 2649 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2650 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2651 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2652 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2653 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2654 switch (cp->tag_at(cp_index).value()) { 2655 case JVM_CONSTANT_Methodref: 2656 case JVM_CONSTANT_InterfaceMethodref: { 2657 Symbol* name = cp->uncached_name_ref_at(cp_index); 2658 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2659 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2660 int methods_count = methods->length(); 2661 for (int i = 0; i < methods_count; i++) { 2662 Method* method = methods->at(i); 2663 if (method->name() == name && method->signature() == signature) { 2664 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2665 } 2666 } 2667 return -1; 2668 } 2669 default: 2670 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2671 } 2672 ShouldNotReachHere(); 2673 return 0; 2674 JVM_END 2675 2676 2677 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2678 2679 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2680 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2681 JVM_END 2682 2683 2684 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2685 JVMWrapper("JVM_IsSameClassPackage"); 2686 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2687 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2688 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2689 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2690 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2691 JVM_END 2692 2693 // Printing support ////////////////////////////////////////////////// 2694 extern "C" { 2695 2696 ATTRIBUTE_PRINTF(3, 0) 2697 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2698 // see bug 4399518, 4417214 2699 if ((intptr_t)count <= 0) return -1; 2700 2701 int result = vsnprintf(str, count, fmt, args); 2702 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2703 // characters which would have been written had the buffer been large 2704 // enough; on Windows, it returns -1. We handle both cases here and 2705 // always return -1, and perform null termination. 2706 if ((result > 0 && (size_t)result >= count) || result == -1) { 2707 str[count - 1] = '\0'; 2708 result = -1; 2709 } 2710 2711 return result; 2712 } 2713 2714 ATTRIBUTE_PRINTF(3, 0) 2715 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2716 va_list args; 2717 int len; 2718 va_start(args, fmt); 2719 len = jio_vsnprintf(str, count, fmt, args); 2720 va_end(args); 2721 return len; 2722 } 2723 2724 ATTRIBUTE_PRINTF(2,3) 2725 int jio_fprintf(FILE* f, const char *fmt, ...) { 2726 int len; 2727 va_list args; 2728 va_start(args, fmt); 2729 len = jio_vfprintf(f, fmt, args); 2730 va_end(args); 2731 return len; 2732 } 2733 2734 ATTRIBUTE_PRINTF(2, 0) 2735 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2736 if (Arguments::vfprintf_hook() != NULL) { 2737 return Arguments::vfprintf_hook()(f, fmt, args); 2738 } else { 2739 return vfprintf(f, fmt, args); 2740 } 2741 } 2742 2743 ATTRIBUTE_PRINTF(1, 2) 2744 JNIEXPORT int jio_printf(const char *fmt, ...) { 2745 int len; 2746 va_list args; 2747 va_start(args, fmt); 2748 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2749 va_end(args); 2750 return len; 2751 } 2752 2753 2754 // HotSpot specific jio method 2755 void jio_print(const char* s) { 2756 // Try to make this function as atomic as possible. 2757 if (Arguments::vfprintf_hook() != NULL) { 2758 jio_fprintf(defaultStream::output_stream(), "%s", s); 2759 } else { 2760 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2761 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2762 } 2763 } 2764 2765 } // Extern C 2766 2767 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2768 2769 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 2770 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or 2771 // OSThread objects. The exception to this rule is when the target object is the thread 2772 // doing the operation, in which case we know that the thread won't exit until the 2773 // operation is done (all exits being voluntary). There are a few cases where it is 2774 // rather silly to do operations on yourself, like resuming yourself or asking whether 2775 // you are alive. While these can still happen, they are not subject to deadlocks if 2776 // the lock is held while the operation occurs (this is not the case for suspend, for 2777 // instance), and are very unlikely. Because IsAlive needs to be fast and its 2778 // implementation is local to this file, we always lock Threads_lock for that one. 2779 2780 static void thread_entry(JavaThread* thread, TRAPS) { 2781 HandleMark hm(THREAD); 2782 Handle obj(THREAD, thread->threadObj()); 2783 JavaValue result(T_VOID); 2784 JavaCalls::call_virtual(&result, 2785 obj, 2786 KlassHandle(THREAD, SystemDictionary::Thread_klass()), 2787 vmSymbols::run_method_name(), 2788 vmSymbols::void_method_signature(), 2789 THREAD); 2790 } 2791 2792 2793 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2794 JVMWrapper("JVM_StartThread"); 2795 JavaThread *native_thread = NULL; 2796 2797 // We cannot hold the Threads_lock when we throw an exception, 2798 // due to rank ordering issues. Example: we might need to grab the 2799 // Heap_lock while we construct the exception. 2800 bool throw_illegal_thread_state = false; 2801 2802 // We must release the Threads_lock before we can post a jvmti event 2803 // in Thread::start. 2804 { 2805 // Ensure that the C++ Thread and OSThread structures aren't freed before 2806 // we operate. 2807 MutexLocker mu(Threads_lock); 2808 2809 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2810 // re-starting an already started thread, so we should usually find 2811 // that the JavaThread is null. However for a JNI attached thread 2812 // there is a small window between the Thread object being created 2813 // (with its JavaThread set) and the update to its threadStatus, so we 2814 // have to check for this 2815 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2816 throw_illegal_thread_state = true; 2817 } else { 2818 // We could also check the stillborn flag to see if this thread was already stopped, but 2819 // for historical reasons we let the thread detect that itself when it starts running 2820 2821 jlong size = 2822 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2823 // Allocate the C++ Thread structure and create the native thread. The 2824 // stack size retrieved from java is signed, but the constructor takes 2825 // size_t (an unsigned type), so avoid passing negative values which would 2826 // result in really large stacks. 2827 size_t sz = size > 0 ? (size_t) size : 0; 2828 native_thread = new JavaThread(&thread_entry, sz); 2829 2830 // At this point it may be possible that no osthread was created for the 2831 // JavaThread due to lack of memory. Check for this situation and throw 2832 // an exception if necessary. Eventually we may want to change this so 2833 // that we only grab the lock if the thread was created successfully - 2834 // then we can also do this check and throw the exception in the 2835 // JavaThread constructor. 2836 if (native_thread->osthread() != NULL) { 2837 // Note: the current thread is not being used within "prepare". 2838 native_thread->prepare(jthread); 2839 } 2840 } 2841 } 2842 2843 if (throw_illegal_thread_state) { 2844 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2845 } 2846 2847 assert(native_thread != NULL, "Starting null thread?"); 2848 2849 if (native_thread->osthread() == NULL) { 2850 // No one should hold a reference to the 'native_thread'. 2851 delete native_thread; 2852 if (JvmtiExport::should_post_resource_exhausted()) { 2853 JvmtiExport::post_resource_exhausted( 2854 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2855 os::native_thread_creation_failed_msg()); 2856 } 2857 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2858 os::native_thread_creation_failed_msg()); 2859 } 2860 2861 Thread::start(native_thread); 2862 2863 JVM_END 2864 2865 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2866 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2867 // but is thought to be reliable and simple. In the case, where the receiver is the 2868 // same thread as the sender, no safepoint is needed. 2869 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2870 JVMWrapper("JVM_StopThread"); 2871 2872 oop java_throwable = JNIHandles::resolve(throwable); 2873 if (java_throwable == NULL) { 2874 THROW(vmSymbols::java_lang_NullPointerException()); 2875 } 2876 oop java_thread = JNIHandles::resolve_non_null(jthread); 2877 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2878 Events::log_exception(JavaThread::current(), 2879 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2880 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2881 // First check if thread is alive 2882 if (receiver != NULL) { 2883 // Check if exception is getting thrown at self (use oop equality, since the 2884 // target object might exit) 2885 if (java_thread == thread->threadObj()) { 2886 THROW_OOP(java_throwable); 2887 } else { 2888 // Enques a VM_Operation to stop all threads and then deliver the exception... 2889 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 2890 } 2891 } 2892 else { 2893 // Either: 2894 // - target thread has not been started before being stopped, or 2895 // - target thread already terminated 2896 // We could read the threadStatus to determine which case it is 2897 // but that is overkill as it doesn't matter. We must set the 2898 // stillborn flag for the first case, and if the thread has already 2899 // exited setting this flag has no affect 2900 java_lang_Thread::set_stillborn(java_thread); 2901 } 2902 JVM_END 2903 2904 2905 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2906 JVMWrapper("JVM_IsThreadAlive"); 2907 2908 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2909 return java_lang_Thread::is_alive(thread_oop); 2910 JVM_END 2911 2912 2913 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2914 JVMWrapper("JVM_SuspendThread"); 2915 oop java_thread = JNIHandles::resolve_non_null(jthread); 2916 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2917 2918 if (receiver != NULL) { 2919 // thread has run and has not exited (still on threads list) 2920 2921 { 2922 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2923 if (receiver->is_external_suspend()) { 2924 // Don't allow nested external suspend requests. We can't return 2925 // an error from this interface so just ignore the problem. 2926 return; 2927 } 2928 if (receiver->is_exiting()) { // thread is in the process of exiting 2929 return; 2930 } 2931 receiver->set_external_suspend(); 2932 } 2933 2934 // java_suspend() will catch threads in the process of exiting 2935 // and will ignore them. 2936 receiver->java_suspend(); 2937 2938 // It would be nice to have the following assertion in all the 2939 // time, but it is possible for a racing resume request to have 2940 // resumed this thread right after we suspended it. Temporarily 2941 // enable this assertion if you are chasing a different kind of 2942 // bug. 2943 // 2944 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2945 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2946 } 2947 JVM_END 2948 2949 2950 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2951 JVMWrapper("JVM_ResumeThread"); 2952 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 2953 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2954 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2955 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2956 // looks at it. 2957 MutexLocker ml(Threads_lock); 2958 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2959 if (thr != NULL) { 2960 // the thread has run and is not in the process of exiting 2961 thr->java_resume(); 2962 } 2963 JVM_END 2964 2965 2966 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2967 JVMWrapper("JVM_SetThreadPriority"); 2968 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2969 MutexLocker ml(Threads_lock); 2970 oop java_thread = JNIHandles::resolve_non_null(jthread); 2971 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2972 JavaThread* thr = java_lang_Thread::thread(java_thread); 2973 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 2974 Thread::set_priority(thr, (ThreadPriority)prio); 2975 } 2976 JVM_END 2977 2978 2979 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2980 JVMWrapper("JVM_Yield"); 2981 if (os::dont_yield()) return; 2982 HOTSPOT_THREAD_YIELD(); 2983 2984 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield. 2985 // Critical for similar threading behaviour 2986 if (ConvertYieldToSleep) { 2987 os::sleep(thread, MinSleepInterval, false); 2988 } else { 2989 os::naked_yield(); 2990 } 2991 JVM_END 2992 2993 2994 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2995 JVMWrapper("JVM_Sleep"); 2996 2997 if (millis < 0) { 2998 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2999 } 3000 3001 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 3002 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3003 } 3004 3005 // Save current thread state and restore it at the end of this block. 3006 // And set new thread state to SLEEPING. 3007 JavaThreadSleepState jtss(thread); 3008 3009 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3010 3011 EventThreadSleep event; 3012 3013 if (millis == 0) { 3014 // When ConvertSleepToYield is on, this matches the classic VM implementation of 3015 // JVM_Sleep. Critical for similar threading behaviour (Win32) 3016 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep 3017 // for SOLARIS 3018 if (ConvertSleepToYield) { 3019 os::naked_yield(); 3020 } else { 3021 ThreadState old_state = thread->osthread()->get_state(); 3022 thread->osthread()->set_state(SLEEPING); 3023 os::sleep(thread, MinSleepInterval, false); 3024 thread->osthread()->set_state(old_state); 3025 } 3026 } else { 3027 ThreadState old_state = thread->osthread()->get_state(); 3028 thread->osthread()->set_state(SLEEPING); 3029 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3030 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3031 // us while we were sleeping. We do not overwrite those. 3032 if (!HAS_PENDING_EXCEPTION) { 3033 if (event.should_commit()) { 3034 event.set_time(millis); 3035 event.commit(); 3036 } 3037 HOTSPOT_THREAD_SLEEP_END(1); 3038 3039 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3040 // to properly restore the thread state. That's likely wrong. 3041 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3042 } 3043 } 3044 thread->osthread()->set_state(old_state); 3045 } 3046 if (event.should_commit()) { 3047 event.set_time(millis); 3048 event.commit(); 3049 } 3050 HOTSPOT_THREAD_SLEEP_END(0); 3051 JVM_END 3052 3053 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3054 JVMWrapper("JVM_CurrentThread"); 3055 oop jthread = thread->threadObj(); 3056 assert (thread != NULL, "no current thread!"); 3057 return JNIHandles::make_local(env, jthread); 3058 JVM_END 3059 3060 3061 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3062 JVMWrapper("JVM_CountStackFrames"); 3063 3064 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3065 oop java_thread = JNIHandles::resolve_non_null(jthread); 3066 bool throw_illegal_thread_state = false; 3067 int count = 0; 3068 3069 { 3070 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3071 // We need to re-resolve the java_thread, since a GC might have happened during the 3072 // acquire of the lock 3073 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3074 3075 if (thr == NULL) { 3076 // do nothing 3077 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 3078 // Check whether this java thread has been suspended already. If not, throws 3079 // IllegalThreadStateException. We defer to throw that exception until 3080 // Threads_lock is released since loading exception class has to leave VM. 3081 // The correct way to test a thread is actually suspended is 3082 // wait_for_ext_suspend_completion(), but we can't call that while holding 3083 // the Threads_lock. The above tests are sufficient for our purposes 3084 // provided the walkability of the stack is stable - which it isn't 3085 // 100% but close enough for most practical purposes. 3086 throw_illegal_thread_state = true; 3087 } else { 3088 // Count all java activation, i.e., number of vframes 3089 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 3090 // Native frames are not counted 3091 if (!vfst.method()->is_native()) count++; 3092 } 3093 } 3094 } 3095 3096 if (throw_illegal_thread_state) { 3097 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3098 "this thread is not suspended"); 3099 } 3100 return count; 3101 JVM_END 3102 3103 // Consider: A better way to implement JVM_Interrupt() is to acquire 3104 // Threads_lock to resolve the jthread into a Thread pointer, fetch 3105 // Thread->platformevent, Thread->native_thr, Thread->parker, etc., 3106 // drop Threads_lock, and the perform the unpark() and thr_kill() operations 3107 // outside the critical section. Threads_lock is hot so we want to minimize 3108 // the hold-time. A cleaner interface would be to decompose interrupt into 3109 // two steps. The 1st phase, performed under Threads_lock, would return 3110 // a closure that'd be invoked after Threads_lock was dropped. 3111 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 3112 // admit spurious wakeups. 3113 3114 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3115 JVMWrapper("JVM_Interrupt"); 3116 3117 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3118 oop java_thread = JNIHandles::resolve_non_null(jthread); 3119 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3120 // We need to re-resolve the java_thread, since a GC might have happened during the 3121 // acquire of the lock 3122 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3123 if (thr != NULL) { 3124 Thread::interrupt(thr); 3125 } 3126 JVM_END 3127 3128 3129 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3130 JVMWrapper("JVM_IsInterrupted"); 3131 3132 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3133 oop java_thread = JNIHandles::resolve_non_null(jthread); 3134 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3135 // We need to re-resolve the java_thread, since a GC might have happened during the 3136 // acquire of the lock 3137 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3138 if (thr == NULL) { 3139 return JNI_FALSE; 3140 } else { 3141 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3142 } 3143 JVM_END 3144 3145 3146 // Return true iff the current thread has locked the object passed in 3147 3148 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3149 JVMWrapper("JVM_HoldsLock"); 3150 assert(THREAD->is_Java_thread(), "sanity check"); 3151 if (obj == NULL) { 3152 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3153 } 3154 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3155 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3156 JVM_END 3157 3158 3159 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3160 JVMWrapper("JVM_DumpAllStacks"); 3161 VM_PrintThreads op; 3162 VMThread::execute(&op); 3163 if (JvmtiExport::should_post_data_dump()) { 3164 JvmtiExport::post_data_dump(); 3165 } 3166 JVM_END 3167 3168 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3169 JVMWrapper("JVM_SetNativeThreadName"); 3170 ResourceMark rm(THREAD); 3171 oop java_thread = JNIHandles::resolve_non_null(jthread); 3172 JavaThread* thr = java_lang_Thread::thread(java_thread); 3173 // Thread naming only supported for the current thread, doesn't work for 3174 // target threads. 3175 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3176 // we don't set the name of an attached thread to avoid stepping 3177 // on other programs 3178 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3179 os::set_native_thread_name(thread_name); 3180 } 3181 JVM_END 3182 3183 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3184 3185 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3186 assert(jthread->is_Java_thread(), "must be a Java thread"); 3187 if (jthread->privileged_stack_top() == NULL) return false; 3188 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3189 oop loader = jthread->privileged_stack_top()->class_loader(); 3190 if (loader == NULL) return true; 3191 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3192 if (trusted) return true; 3193 } 3194 return false; 3195 } 3196 3197 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3198 JVMWrapper("JVM_CurrentLoadedClass"); 3199 ResourceMark rm(THREAD); 3200 3201 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3202 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3203 bool trusted = is_trusted_frame(thread, &vfst); 3204 if (trusted) return NULL; 3205 3206 Method* m = vfst.method(); 3207 if (!m->is_native()) { 3208 InstanceKlass* holder = m->method_holder(); 3209 oop loader = holder->class_loader(); 3210 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3211 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3212 } 3213 } 3214 } 3215 return NULL; 3216 JVM_END 3217 3218 3219 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3220 JVMWrapper("JVM_CurrentClassLoader"); 3221 ResourceMark rm(THREAD); 3222 3223 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3224 3225 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3226 bool trusted = is_trusted_frame(thread, &vfst); 3227 if (trusted) return NULL; 3228 3229 Method* m = vfst.method(); 3230 if (!m->is_native()) { 3231 InstanceKlass* holder = m->method_holder(); 3232 assert(holder->is_klass(), "just checking"); 3233 oop loader = holder->class_loader(); 3234 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3235 return JNIHandles::make_local(env, loader); 3236 } 3237 } 3238 } 3239 return NULL; 3240 JVM_END 3241 3242 3243 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3244 JVMWrapper("JVM_GetClassContext"); 3245 ResourceMark rm(THREAD); 3246 JvmtiVMObjectAllocEventCollector oam; 3247 vframeStream vfst(thread); 3248 3249 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3250 // This must only be called from SecurityManager.getClassContext 3251 Method* m = vfst.method(); 3252 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3253 m->name() == vmSymbols::getClassContext_name() && 3254 m->signature() == vmSymbols::void_class_array_signature())) { 3255 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3256 } 3257 } 3258 3259 // Collect method holders 3260 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>(); 3261 for (; !vfst.at_end(); vfst.security_next()) { 3262 Method* m = vfst.method(); 3263 // Native frames are not returned 3264 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3265 Klass* holder = m->method_holder(); 3266 assert(holder->is_klass(), "just checking"); 3267 klass_array->append(holder); 3268 } 3269 } 3270 3271 // Create result array of type [Ljava/lang/Class; 3272 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3273 // Fill in mirrors corresponding to method holders 3274 for (int i = 0; i < klass_array->length(); i++) { 3275 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3276 } 3277 3278 return (jobjectArray) JNIHandles::make_local(env, result); 3279 JVM_END 3280 3281 3282 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3283 JVMWrapper("JVM_ClassDepth"); 3284 ResourceMark rm(THREAD); 3285 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3286 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3287 3288 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3289 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3290 if (class_name_sym == NULL) { 3291 return -1; 3292 } 3293 3294 int depth = 0; 3295 3296 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3297 if (!vfst.method()->is_native()) { 3298 InstanceKlass* holder = vfst.method()->method_holder(); 3299 assert(holder->is_klass(), "just checking"); 3300 if (holder->name() == class_name_sym) { 3301 return depth; 3302 } 3303 depth++; 3304 } 3305 } 3306 return -1; 3307 JVM_END 3308 3309 3310 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3311 JVMWrapper("JVM_ClassLoaderDepth"); 3312 ResourceMark rm(THREAD); 3313 int depth = 0; 3314 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3315 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3316 bool trusted = is_trusted_frame(thread, &vfst); 3317 if (trusted) return -1; 3318 3319 Method* m = vfst.method(); 3320 if (!m->is_native()) { 3321 InstanceKlass* holder = m->method_holder(); 3322 assert(holder->is_klass(), "just checking"); 3323 oop loader = holder->class_loader(); 3324 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3325 return depth; 3326 } 3327 depth++; 3328 } 3329 } 3330 return -1; 3331 JVM_END 3332 3333 3334 // java.lang.Package //////////////////////////////////////////////////////////////// 3335 3336 3337 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3338 JVMWrapper("JVM_GetSystemPackage"); 3339 ResourceMark rm(THREAD); 3340 JvmtiVMObjectAllocEventCollector oam; 3341 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3342 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3343 return (jstring) JNIHandles::make_local(result); 3344 JVM_END 3345 3346 3347 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3348 JVMWrapper("JVM_GetSystemPackages"); 3349 JvmtiVMObjectAllocEventCollector oam; 3350 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3351 return (jobjectArray) JNIHandles::make_local(result); 3352 JVM_END 3353 3354 3355 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3356 3357 3358 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3359 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3360 3361 MonitorLockerEx ml(Heap_lock); 3362 oop ref = Universe::reference_pending_list(); 3363 if (ref != NULL) { 3364 Universe::set_reference_pending_list(NULL); 3365 } 3366 return JNIHandles::make_local(env, ref); 3367 JVM_END 3368 3369 JVM_ENTRY(jboolean, JVM_CheckReferencePendingList(JNIEnv* env, jboolean await)) 3370 JVMWrapper("JVM_CheckReferencePendingList"); 3371 MonitorLockerEx ml(Heap_lock); 3372 if (Universe::reference_pending_list() != NULL) { 3373 return true; 3374 } else if (await) { 3375 do { 3376 ml.wait(); 3377 } while (Universe::reference_pending_list() == NULL); 3378 return true; 3379 } else { 3380 return false; 3381 } 3382 JVM_END 3383 3384 3385 // ObjectInputStream /////////////////////////////////////////////////////////////// 3386 3387 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3388 if (current_class == NULL) { 3389 return true; 3390 } 3391 if ((current_class == field_class) || access.is_public()) { 3392 return true; 3393 } 3394 3395 if (access.is_protected()) { 3396 // See if current_class is a subclass of field_class 3397 if (current_class->is_subclass_of(field_class)) { 3398 return true; 3399 } 3400 } 3401 3402 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3403 } 3404 3405 // Return the first user-defined class loader up the execution stack, or null 3406 // if only code from the bootstrap or platform class loader is on the stack. 3407 3408 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3409 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3410 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3411 oop loader = vfst.method()->method_holder()->class_loader(); 3412 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3413 return JNIHandles::make_local(env, loader); 3414 } 3415 } 3416 return NULL; 3417 JVM_END 3418 3419 3420 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3421 3422 3423 // resolve array handle and check arguments 3424 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3425 if (arr == NULL) { 3426 THROW_0(vmSymbols::java_lang_NullPointerException()); 3427 } 3428 oop a = JNIHandles::resolve_non_null(arr); 3429 if (!a->is_array()) { 3430 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3431 } else if (type_array_only && !a->is_typeArray()) { 3432 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3433 } 3434 return arrayOop(a); 3435 } 3436 3437 3438 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3439 JVMWrapper("JVM_GetArrayLength"); 3440 arrayOop a = check_array(env, arr, false, CHECK_0); 3441 return a->length(); 3442 JVM_END 3443 3444 3445 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3446 JVMWrapper("JVM_Array_Get"); 3447 JvmtiVMObjectAllocEventCollector oam; 3448 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3449 jvalue value; 3450 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3451 oop box = Reflection::box(&value, type, CHECK_NULL); 3452 return JNIHandles::make_local(env, box); 3453 JVM_END 3454 3455 3456 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3457 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3458 jvalue value; 3459 value.i = 0; // to initialize value before getting used in CHECK 3460 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3461 assert(a->is_typeArray(), "just checking"); 3462 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3463 BasicType wide_type = (BasicType) wCode; 3464 if (type != wide_type) { 3465 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3466 } 3467 return value; 3468 JVM_END 3469 3470 3471 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3472 JVMWrapper("JVM_SetArrayElement"); 3473 arrayOop a = check_array(env, arr, false, CHECK); 3474 oop box = JNIHandles::resolve(val); 3475 jvalue value; 3476 value.i = 0; // to initialize value before getting used in CHECK 3477 BasicType value_type; 3478 if (a->is_objArray()) { 3479 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3480 value_type = Reflection::unbox_for_regular_object(box, &value); 3481 } else { 3482 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3483 } 3484 Reflection::array_set(&value, a, index, value_type, CHECK); 3485 JVM_END 3486 3487 3488 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3489 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3490 arrayOop a = check_array(env, arr, true, CHECK); 3491 assert(a->is_typeArray(), "just checking"); 3492 BasicType value_type = (BasicType) vCode; 3493 Reflection::array_set(&v, a, index, value_type, CHECK); 3494 JVM_END 3495 3496 3497 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3498 JVMWrapper("JVM_NewArray"); 3499 JvmtiVMObjectAllocEventCollector oam; 3500 oop element_mirror = JNIHandles::resolve(eltClass); 3501 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3502 return JNIHandles::make_local(env, result); 3503 JVM_END 3504 3505 3506 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3507 JVMWrapper("JVM_NewMultiArray"); 3508 JvmtiVMObjectAllocEventCollector oam; 3509 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3510 oop element_mirror = JNIHandles::resolve(eltClass); 3511 assert(dim_array->is_typeArray(), "just checking"); 3512 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3513 return JNIHandles::make_local(env, result); 3514 JVM_END 3515 3516 3517 // Library support /////////////////////////////////////////////////////////////////////////// 3518 3519 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3520 //%note jvm_ct 3521 JVMWrapper("JVM_LoadLibrary"); 3522 char ebuf[1024]; 3523 void *load_result; 3524 { 3525 ThreadToNativeFromVM ttnfvm(thread); 3526 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3527 } 3528 if (load_result == NULL) { 3529 char msg[1024]; 3530 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3531 // Since 'ebuf' may contain a string encoded using 3532 // platform encoding scheme, we need to pass 3533 // Exceptions::unsafe_to_utf8 to the new_exception method 3534 // as the last argument. See bug 6367357. 3535 Handle h_exception = 3536 Exceptions::new_exception(thread, 3537 vmSymbols::java_lang_UnsatisfiedLinkError(), 3538 msg, Exceptions::unsafe_to_utf8); 3539 3540 THROW_HANDLE_0(h_exception); 3541 } 3542 return load_result; 3543 JVM_END 3544 3545 3546 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3547 JVMWrapper("JVM_UnloadLibrary"); 3548 os::dll_unload(handle); 3549 JVM_END 3550 3551 3552 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3553 JVMWrapper("JVM_FindLibraryEntry"); 3554 return os::dll_lookup(handle, name); 3555 JVM_END 3556 3557 3558 // JNI version /////////////////////////////////////////////////////////////////////////////// 3559 3560 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3561 JVMWrapper("JVM_IsSupportedJNIVersion"); 3562 return Threads::is_supported_jni_version_including_1_1(version); 3563 JVM_END 3564 3565 3566 // String support /////////////////////////////////////////////////////////////////////////// 3567 3568 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3569 JVMWrapper("JVM_InternString"); 3570 JvmtiVMObjectAllocEventCollector oam; 3571 if (str == NULL) return NULL; 3572 oop string = JNIHandles::resolve_non_null(str); 3573 oop result = StringTable::intern(string, CHECK_NULL); 3574 return (jstring) JNIHandles::make_local(env, result); 3575 JVM_END 3576 3577 3578 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3579 3580 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3581 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3582 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3583 // that only works with java threads. 3584 3585 3586 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3587 VM_Exit::block_if_vm_exited(); 3588 JVMWrapper("JVM_RawMonitorCreate"); 3589 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3590 } 3591 3592 3593 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3594 VM_Exit::block_if_vm_exited(); 3595 JVMWrapper("JVM_RawMonitorDestroy"); 3596 delete ((Mutex*) mon); 3597 } 3598 3599 3600 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3601 VM_Exit::block_if_vm_exited(); 3602 JVMWrapper("JVM_RawMonitorEnter"); 3603 ((Mutex*) mon)->jvm_raw_lock(); 3604 return 0; 3605 } 3606 3607 3608 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3609 VM_Exit::block_if_vm_exited(); 3610 JVMWrapper("JVM_RawMonitorExit"); 3611 ((Mutex*) mon)->jvm_raw_unlock(); 3612 } 3613 3614 3615 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3616 3617 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3618 Handle loader, Handle protection_domain, 3619 jboolean throwError, TRAPS) { 3620 // Security Note: 3621 // The Java level wrapper will perform the necessary security check allowing 3622 // us to pass the NULL as the initiating class loader. The VM is responsible for 3623 // the checkPackageAccess relative to the initiating class loader via the 3624 // protection_domain. The protection_domain is passed as NULL by the java code 3625 // if there is no security manager in 3-arg Class.forName(). 3626 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3627 3628 KlassHandle klass_handle(THREAD, klass); 3629 // Check if we should initialize the class 3630 if (init && klass_handle->is_instance_klass()) { 3631 klass_handle->initialize(CHECK_NULL); 3632 } 3633 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror()); 3634 } 3635 3636 3637 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3638 3639 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3640 JVMWrapper("JVM_InvokeMethod"); 3641 Handle method_handle; 3642 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3643 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3644 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3645 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3646 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3647 jobject res = JNIHandles::make_local(env, result); 3648 if (JvmtiExport::should_post_vm_object_alloc()) { 3649 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3650 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3651 if (java_lang_Class::is_primitive(ret_type)) { 3652 // Only for primitive type vm allocates memory for java object. 3653 // See box() method. 3654 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3655 } 3656 } 3657 return res; 3658 } else { 3659 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3660 } 3661 JVM_END 3662 3663 3664 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3665 JVMWrapper("JVM_NewInstanceFromConstructor"); 3666 oop constructor_mirror = JNIHandles::resolve(c); 3667 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3668 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3669 jobject res = JNIHandles::make_local(env, result); 3670 if (JvmtiExport::should_post_vm_object_alloc()) { 3671 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3672 } 3673 return res; 3674 JVM_END 3675 3676 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3677 3678 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3679 JVMWrapper("JVM_SupportsCX8"); 3680 return VM_Version::supports_cx8(); 3681 JVM_END 3682 3683 // Returns an array of all live Thread objects (VM internal JavaThreads, 3684 // jvmti agent threads, and JNI attaching threads are skipped) 3685 // See CR 6404306 regarding JNI attaching threads 3686 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3687 ResourceMark rm(THREAD); 3688 ThreadsListEnumerator tle(THREAD, false, false); 3689 JvmtiVMObjectAllocEventCollector oam; 3690 3691 int num_threads = tle.num_threads(); 3692 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3693 objArrayHandle threads_ah(THREAD, r); 3694 3695 for (int i = 0; i < num_threads; i++) { 3696 Handle h = tle.get_threadObj(i); 3697 threads_ah->obj_at_put(i, h()); 3698 } 3699 3700 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3701 JVM_END 3702 3703 3704 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3705 // Return StackTraceElement[][], each element is the stack trace of a thread in 3706 // the corresponding entry in the given threads array 3707 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3708 JVMWrapper("JVM_DumpThreads"); 3709 JvmtiVMObjectAllocEventCollector oam; 3710 3711 // Check if threads is null 3712 if (threads == NULL) { 3713 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3714 } 3715 3716 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3717 objArrayHandle ah(THREAD, a); 3718 int num_threads = ah->length(); 3719 // check if threads is non-empty array 3720 if (num_threads == 0) { 3721 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3722 } 3723 3724 // check if threads is not an array of objects of Thread class 3725 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3726 if (k != SystemDictionary::Thread_klass()) { 3727 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3728 } 3729 3730 ResourceMark rm(THREAD); 3731 3732 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3733 for (int i = 0; i < num_threads; i++) { 3734 oop thread_obj = ah->obj_at(i); 3735 instanceHandle h(THREAD, (instanceOop) thread_obj); 3736 thread_handle_array->append(h); 3737 } 3738 3739 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3740 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3741 3742 JVM_END 3743 3744 // JVM monitoring and management support 3745 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3746 return Management::get_jmm_interface(version); 3747 JVM_END 3748 3749 // com.sun.tools.attach.VirtualMachine agent properties support 3750 // 3751 // Initialize the agent properties with the properties maintained in the VM 3752 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3753 JVMWrapper("JVM_InitAgentProperties"); 3754 ResourceMark rm; 3755 3756 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3757 3758 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3759 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3760 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3761 return properties; 3762 JVM_END 3763 3764 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3765 { 3766 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3767 JvmtiVMObjectAllocEventCollector oam; 3768 3769 if (ofClass == NULL) { 3770 return NULL; 3771 } 3772 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3773 // Special handling for primitive objects 3774 if (java_lang_Class::is_primitive(mirror())) { 3775 return NULL; 3776 } 3777 Klass* k = java_lang_Class::as_Klass(mirror()); 3778 if (!k->is_instance_klass()) { 3779 return NULL; 3780 } 3781 instanceKlassHandle ik_h(THREAD, k); 3782 int encl_method_class_idx = ik_h->enclosing_method_class_index(); 3783 if (encl_method_class_idx == 0) { 3784 return NULL; 3785 } 3786 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3787 objArrayHandle dest(THREAD, dest_o); 3788 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3789 dest->obj_at_put(0, enc_k->java_mirror()); 3790 int encl_method_method_idx = ik_h->enclosing_method_method_index(); 3791 if (encl_method_method_idx != 0) { 3792 Symbol* sym = ik_h->constants()->symbol_at( 3793 extract_low_short_from_int( 3794 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3795 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3796 dest->obj_at_put(1, str()); 3797 sym = ik_h->constants()->symbol_at( 3798 extract_high_short_from_int( 3799 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3800 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3801 dest->obj_at_put(2, str()); 3802 } 3803 return (jobjectArray) JNIHandles::make_local(dest()); 3804 } 3805 JVM_END 3806 3807 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3808 { 3809 memset(info, 0, info_size); 3810 3811 info->jvm_version = Abstract_VM_Version::jvm_version(); 3812 info->patch_version = Abstract_VM_Version::vm_patch_version(); 3813 3814 // when we add a new capability in the jvm_version_info struct, we should also 3815 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3816 // counter defined in runtimeService.cpp. 3817 info->is_attachable = AttachListener::is_attach_supported(); 3818 } 3819 JVM_END 3820 3821 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3822 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3823 ResourceMark rm(THREAD); 3824 3825 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3826 return NULL; 3827 } 3828 3829 char** vm_flags = Arguments::jvm_flags_array(); 3830 char** vm_args = Arguments::jvm_args_array(); 3831 int num_flags = Arguments::num_jvm_flags(); 3832 int num_args = Arguments::num_jvm_args(); 3833 3834 instanceKlassHandle ik (THREAD, SystemDictionary::String_klass()); 3835 objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL); 3836 objArrayHandle result_h(THREAD, r); 3837 3838 int index = 0; 3839 for (int j = 0; j < num_flags; j++, index++) { 3840 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3841 result_h->obj_at_put(index, h()); 3842 } 3843 for (int i = 0; i < num_args; i++, index++) { 3844 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3845 result_h->obj_at_put(index, h()); 3846 } 3847 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3848 JVM_END 3849 3850 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3851 return os::get_signal_number(name); 3852 JVM_END