1 /* 2 * Copyright (c) 1997, 2018, 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 "jvm.h" 27 #include "classfile/classFileStream.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/javaAssertions.hpp" 31 #include "classfile/javaClasses.inline.hpp" 32 #include "classfile/moduleEntry.hpp" 33 #include "classfile/modules.hpp" 34 #include "classfile/packageEntry.hpp" 35 #include "classfile/stringTable.hpp" 36 #include "classfile/systemDictionary.hpp" 37 #include "classfile/vmSymbols.hpp" 38 #include "gc/shared/collectedHeap.inline.hpp" 39 #include "interpreter/bytecode.hpp" 40 #include "jfr/jfrEvents.hpp" 41 #include "logging/log.hpp" 42 #include "memory/heapShared.hpp" 43 #include "memory/oopFactory.hpp" 44 #include "memory/referenceType.hpp" 45 #include "memory/resourceArea.hpp" 46 #include "memory/universe.hpp" 47 #include "oops/access.inline.hpp" 48 #include "oops/fieldStreams.hpp" 49 #include "oops/instanceKlass.hpp" 50 #include "oops/method.hpp" 51 #include "oops/objArrayKlass.hpp" 52 #include "oops/objArrayOop.inline.hpp" 53 #include "oops/oop.inline.hpp" 54 #include "prims/jvm_misc.hpp" 55 #include "prims/jvmtiExport.hpp" 56 #include "prims/jvmtiThreadState.hpp" 57 #include "prims/nativeLookup.hpp" 58 #include "prims/privilegedStack.hpp" 59 #include "prims/stackwalk.hpp" 60 #include "runtime/arguments.hpp" 61 #include "runtime/atomic.hpp" 62 #include "runtime/handles.inline.hpp" 63 #include "runtime/init.hpp" 64 #include "runtime/interfaceSupport.inline.hpp" 65 #include "runtime/java.hpp" 66 #include "runtime/javaCalls.hpp" 67 #include "runtime/jfieldIDWorkaround.hpp" 68 #include "runtime/jniHandles.inline.hpp" 69 #include "runtime/orderAccess.hpp" 70 #include "runtime/os.inline.hpp" 71 #include "runtime/perfData.hpp" 72 #include "runtime/reflection.hpp" 73 #include "runtime/thread.inline.hpp" 74 #include "runtime/threadSMR.hpp" 75 #include "runtime/vframe.inline.hpp" 76 #include "runtime/vm_operations.hpp" 77 #include "runtime/vm_version.hpp" 78 #include "services/attachListener.hpp" 79 #include "services/management.hpp" 80 #include "services/threadService.hpp" 81 #include "utilities/copy.hpp" 82 #include "utilities/defaultStream.hpp" 83 #include "utilities/dtrace.hpp" 84 #include "utilities/events.hpp" 85 #include "utilities/histogram.hpp" 86 #include "utilities/macros.hpp" 87 #include "utilities/utf8.hpp" 88 #if INCLUDE_CDS 89 #include "classfile/systemDictionaryShared.hpp" 90 #endif 91 92 #include <errno.h> 93 94 /* 95 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 96 such ctors and calls MUST NOT come between an oop declaration/init and its 97 usage because if objects are move this may cause various memory stomps, bus 98 errors and segfaults. Here is a cookbook for causing so called "naked oop 99 failures": 100 101 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 102 JVMWrapper("JVM_GetClassDeclaredFields"); 103 104 // Object address to be held directly in mirror & not visible to GC 105 oop mirror = JNIHandles::resolve_non_null(ofClass); 106 107 // If this ctor can hit a safepoint, moving objects around, then 108 ComplexConstructor foo; 109 110 // Boom! mirror may point to JUNK instead of the intended object 111 (some dereference of mirror) 112 113 // Here's another call that may block for GC, making mirror stale 114 MutexLocker ml(some_lock); 115 116 // And here's an initializer that can result in a stale oop 117 // all in one step. 118 oop o = call_that_can_throw_exception(TRAPS); 119 120 121 The solution is to keep the oop declaration BELOW the ctor or function 122 call that might cause a GC, do another resolve to reassign the oop, or 123 consider use of a Handle instead of an oop so there is immunity from object 124 motion. But note that the "QUICK" entries below do not have a handlemark 125 and thus can only support use of handles passed in. 126 */ 127 128 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 129 ResourceMark rm; 130 int line_number = -1; 131 const char * source_file = NULL; 132 const char * trace = "explicit"; 133 InstanceKlass* caller = NULL; 134 JavaThread* jthread = JavaThread::current(); 135 if (jthread->has_last_Java_frame()) { 136 vframeStream vfst(jthread); 137 138 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 139 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 140 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 141 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 142 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 143 144 Method* last_caller = NULL; 145 146 while (!vfst.at_end()) { 147 Method* m = vfst.method(); 148 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 149 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 150 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 151 break; 152 } 153 last_caller = m; 154 vfst.next(); 155 } 156 // if this is called from Class.forName0 and that is called from Class.forName, 157 // then print the caller of Class.forName. If this is Class.loadClass, then print 158 // that caller, otherwise keep quiet since this should be picked up elsewhere. 159 bool found_it = false; 160 if (!vfst.at_end() && 161 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 162 vfst.method()->name() == vmSymbols::forName0_name()) { 163 vfst.next(); 164 if (!vfst.at_end() && 165 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 166 vfst.method()->name() == vmSymbols::forName_name()) { 167 vfst.next(); 168 found_it = true; 169 } 170 } else if (last_caller != NULL && 171 last_caller->method_holder()->name() == 172 vmSymbols::java_lang_ClassLoader() && 173 last_caller->name() == vmSymbols::loadClass_name()) { 174 found_it = true; 175 } else if (!vfst.at_end()) { 176 if (vfst.method()->is_native()) { 177 // JNI call 178 found_it = true; 179 } 180 } 181 if (found_it && !vfst.at_end()) { 182 // found the caller 183 caller = vfst.method()->method_holder(); 184 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 185 if (line_number == -1) { 186 // show method name if it's a native method 187 trace = vfst.method()->name_and_sig_as_C_string(); 188 } 189 Symbol* s = caller->source_file_name(); 190 if (s != NULL) { 191 source_file = s->as_C_string(); 192 } 193 } 194 } 195 if (caller != NULL) { 196 if (to_class != caller) { 197 const char * from = caller->external_name(); 198 const char * to = to_class->external_name(); 199 // print in a single call to reduce interleaving between threads 200 if (source_file != NULL) { 201 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 202 } else { 203 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 204 } 205 } 206 } 207 } 208 209 void trace_class_resolution(Klass* to_class) { 210 EXCEPTION_MARK; 211 trace_class_resolution_impl(to_class, THREAD); 212 if (HAS_PENDING_EXCEPTION) { 213 CLEAR_PENDING_EXCEPTION; 214 } 215 } 216 217 // Wrapper to trace JVM functions 218 219 #ifdef ASSERT 220 Histogram* JVMHistogram; 221 volatile int JVMHistogram_lock = 0; 222 223 class JVMHistogramElement : public HistogramElement { 224 public: 225 JVMHistogramElement(const char* name); 226 }; 227 228 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 229 _name = elementName; 230 uintx count = 0; 231 232 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 233 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 234 count +=1; 235 if ( (WarnOnStalledSpinLock > 0) 236 && (count % WarnOnStalledSpinLock == 0)) { 237 warning("JVMHistogram_lock seems to be stalled"); 238 } 239 } 240 } 241 242 if(JVMHistogram == NULL) 243 JVMHistogram = new Histogram("JVM Call Counts",100); 244 245 JVMHistogram->add_element(this); 246 Atomic::dec(&JVMHistogram_lock); 247 } 248 249 #define JVMCountWrapper(arg) \ 250 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 251 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 252 253 #define JVMWrapper(arg) JVMCountWrapper(arg); 254 #else 255 #define JVMWrapper(arg) 256 #endif 257 258 259 // Interface version ///////////////////////////////////////////////////////////////////// 260 261 262 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 263 return JVM_INTERFACE_VERSION; 264 JVM_END 265 266 267 // java.lang.System ////////////////////////////////////////////////////////////////////// 268 269 270 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 271 JVMWrapper("JVM_CurrentTimeMillis"); 272 return os::javaTimeMillis(); 273 JVM_END 274 275 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 276 JVMWrapper("JVM_NanoTime"); 277 return os::javaTimeNanos(); 278 JVM_END 279 280 // The function below is actually exposed by jdk.internal.misc.VM and not 281 // java.lang.System, but we choose to keep it here so that it stays next 282 // to JVM_CurrentTimeMillis and JVM_NanoTime 283 284 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 285 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 286 287 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 288 JVMWrapper("JVM_GetNanoTimeAdjustment"); 289 jlong seconds; 290 jlong nanos; 291 292 os::javaTimeSystemUTC(seconds, nanos); 293 294 // We're going to verify that the result can fit in a long. 295 // For that we need the difference in seconds between 'seconds' 296 // and 'offset_secs' to be such that: 297 // |seconds - offset_secs| < (2^63/10^9) 298 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 299 // which makes |seconds - offset_secs| < 2^33 300 // and we will prefer +/- 2^32 as the maximum acceptable diff 301 // as 2^32 has a more natural feel than 2^33... 302 // 303 // So if |seconds - offset_secs| >= 2^32 - we return a special 304 // sentinel value (-1) which the caller should take as an 305 // exception value indicating that the offset given to us is 306 // too far from range of the current time - leading to too big 307 // a nano adjustment. The caller is expected to recover by 308 // computing a more accurate offset and calling this method 309 // again. (For the record 2^32 secs is ~136 years, so that 310 // should rarely happen) 311 // 312 jlong diff = seconds - offset_secs; 313 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 314 return -1; // sentinel value: the offset is too far off the target 315 } 316 317 // return the adjustment. If you compute a time by adding 318 // this number of nanoseconds along with the number of seconds 319 // in the offset you should get the current UTC time. 320 return (diff * (jlong)1000000000) + nanos; 321 JVM_END 322 323 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 324 jobject dst, jint dst_pos, jint length)) 325 JVMWrapper("JVM_ArrayCopy"); 326 // Check if we have null pointers 327 if (src == NULL || dst == NULL) { 328 THROW(vmSymbols::java_lang_NullPointerException()); 329 } 330 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 331 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 332 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 333 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 334 // Do copy 335 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 336 JVM_END 337 338 339 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 340 JavaValue r(T_OBJECT); 341 // public synchronized Object put(Object key, Object value); 342 HandleMark hm(THREAD); 343 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 344 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 345 JavaCalls::call_virtual(&r, 346 props, 347 SystemDictionary::Properties_klass(), 348 vmSymbols::put_name(), 349 vmSymbols::object_object_object_signature(), 350 key_str, 351 value_str, 352 THREAD); 353 } 354 355 356 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 357 358 359 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 360 JVMWrapper("JVM_InitProperties"); 361 ResourceMark rm; 362 363 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 364 365 // System property list includes both user set via -D option and 366 // jvm system specific properties. 367 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 368 PUTPROP(props, p->key(), p->value()); 369 } 370 371 // Convert the -XX:MaxDirectMemorySize= command line flag 372 // to the sun.nio.MaxDirectMemorySize property. 373 // Do this after setting user properties to prevent people 374 // from setting the value with a -D option, as requested. 375 { 376 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 377 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 378 } else { 379 char as_chars[256]; 380 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 381 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 382 } 383 } 384 385 // JVM monitoring and management support 386 // Add the sun.management.compiler property for the compiler's name 387 { 388 #undef CSIZE 389 #if defined(_LP64) || defined(_WIN64) 390 #define CSIZE "64-Bit " 391 #else 392 #define CSIZE 393 #endif // 64bit 394 395 #ifdef TIERED 396 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 397 #else 398 #if defined(COMPILER1) 399 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 400 #elif defined(COMPILER2) 401 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 402 #elif INCLUDE_JVMCI 403 #error "INCLUDE_JVMCI should imply TIERED" 404 #else 405 const char* compiler_name = ""; 406 #endif // compilers 407 #endif // TIERED 408 409 if (*compiler_name != '\0' && 410 (Arguments::mode() != Arguments::_int)) { 411 PUTPROP(props, "sun.management.compiler", compiler_name); 412 } 413 } 414 415 return properties; 416 JVM_END 417 418 419 /* 420 * Return the temporary directory that the VM uses for the attach 421 * and perf data files. 422 * 423 * It is important that this directory is well-known and the 424 * same for all VM instances. It cannot be affected by configuration 425 * variables such as java.io.tmpdir. 426 */ 427 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 428 JVMWrapper("JVM_GetTemporaryDirectory"); 429 HandleMark hm(THREAD); 430 const char* temp_dir = os::get_temp_directory(); 431 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 432 return (jstring) JNIHandles::make_local(env, h()); 433 JVM_END 434 435 436 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 437 438 extern volatile jint vm_created; 439 440 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 441 JVMWrapper("JVM_BeforeHalt"); 442 EventShutdown event; 443 if (event.should_commit()) { 444 event.set_reason("Shutdown requested from Java"); 445 event.commit(); 446 } 447 JVM_END 448 449 450 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 451 before_exit(thread); 452 vm_exit(code); 453 JVM_END 454 455 456 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 457 JVMWrapper("JVM_GC"); 458 if (!DisableExplicitGC) { 459 Universe::heap()->collect(GCCause::_java_lang_system_gc); 460 } 461 JVM_END 462 463 464 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 465 JVMWrapper("JVM_MaxObjectInspectionAge"); 466 return Universe::heap()->millis_since_last_gc(); 467 JVM_END 468 469 470 static inline jlong convert_size_t_to_jlong(size_t val) { 471 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 472 NOT_LP64 (return (jlong)val;) 473 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 474 } 475 476 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 477 JVMWrapper("JVM_TotalMemory"); 478 size_t n = Universe::heap()->capacity(); 479 return convert_size_t_to_jlong(n); 480 JVM_END 481 482 483 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 484 JVMWrapper("JVM_FreeMemory"); 485 CollectedHeap* ch = Universe::heap(); 486 size_t n; 487 { 488 MutexLocker x(Heap_lock); 489 n = ch->capacity() - ch->used(); 490 } 491 return convert_size_t_to_jlong(n); 492 JVM_END 493 494 495 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 496 JVMWrapper("JVM_MaxMemory"); 497 size_t n = Universe::heap()->max_capacity(); 498 return convert_size_t_to_jlong(n); 499 JVM_END 500 501 502 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 503 JVMWrapper("JVM_ActiveProcessorCount"); 504 return os::active_processor_count(); 505 JVM_END 506 507 508 509 // java.lang.Throwable ////////////////////////////////////////////////////// 510 511 512 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 513 JVMWrapper("JVM_FillInStackTrace"); 514 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 515 java_lang_Throwable::fill_in_stack_trace(exception); 516 JVM_END 517 518 519 // java.lang.StackTraceElement ////////////////////////////////////////////// 520 521 522 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 523 JVMWrapper("JVM_InitStackTraceElementArray"); 524 Handle exception(THREAD, JNIHandles::resolve(throwable)); 525 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 526 objArrayHandle stack_trace(THREAD, st); 527 // Fill in the allocated stack trace 528 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 529 JVM_END 530 531 532 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 533 JVMWrapper("JVM_InitStackTraceElement"); 534 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 535 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 536 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 537 JVM_END 538 539 540 // java.lang.StackWalker ////////////////////////////////////////////////////// 541 542 543 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 544 jint skip_frames, jint frame_count, jint start_index, 545 jobjectArray frames)) 546 JVMWrapper("JVM_CallStackWalk"); 547 JavaThread* jt = (JavaThread*) THREAD; 548 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 549 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 550 } 551 552 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 553 554 // frames array is a Class<?>[] array when only getting caller reference, 555 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 556 // be null. 557 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 558 objArrayHandle frames_array_h(THREAD, fa); 559 560 int limit = start_index + frame_count; 561 if (frames_array_h->length() < limit) { 562 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 563 } 564 565 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 566 start_index, frames_array_h, CHECK_NULL); 567 return JNIHandles::make_local(env, result); 568 JVM_END 569 570 571 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 572 jint frame_count, jint start_index, 573 jobjectArray frames)) 574 JVMWrapper("JVM_MoreStackWalk"); 575 JavaThread* jt = (JavaThread*) THREAD; 576 577 // frames array is a Class<?>[] array when only getting caller reference, 578 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 579 // be null. 580 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 581 objArrayHandle frames_array_h(THREAD, fa); 582 583 int limit = start_index+frame_count; 584 if (frames_array_h->length() < limit) { 585 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 586 } 587 588 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 589 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 590 start_index, frames_array_h, THREAD); 591 JVM_END 592 593 // java.lang.Object /////////////////////////////////////////////// 594 595 596 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 597 JVMWrapper("JVM_IHashCode"); 598 // as implemented in the classic virtual machine; return 0 if object is NULL 599 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 600 JVM_END 601 602 603 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 604 JVMWrapper("JVM_MonitorWait"); 605 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 606 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 607 if (JvmtiExport::should_post_monitor_wait()) { 608 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 609 610 // The current thread already owns the monitor and it has not yet 611 // been added to the wait queue so the current thread cannot be 612 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 613 // event handler cannot accidentally consume an unpark() meant for 614 // the ParkEvent associated with this ObjectMonitor. 615 } 616 ObjectSynchronizer::wait(obj, ms, CHECK); 617 JVM_END 618 619 620 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 621 JVMWrapper("JVM_MonitorNotify"); 622 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 623 ObjectSynchronizer::notify(obj, CHECK); 624 JVM_END 625 626 627 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 628 JVMWrapper("JVM_MonitorNotifyAll"); 629 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 630 ObjectSynchronizer::notifyall(obj, CHECK); 631 JVM_END 632 633 634 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 635 JVMWrapper("JVM_Clone"); 636 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 637 Klass* klass = obj->klass(); 638 JvmtiVMObjectAllocEventCollector oam; 639 640 #ifdef ASSERT 641 // Just checking that the cloneable flag is set correct 642 if (obj->is_array()) { 643 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 644 } else { 645 guarantee(obj->is_instance(), "should be instanceOop"); 646 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 647 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 648 } 649 #endif 650 651 // Check if class of obj supports the Cloneable interface. 652 // All arrays are considered to be cloneable (See JLS 20.1.5). 653 // All j.l.r.Reference classes are considered non-cloneable. 654 if (!klass->is_cloneable() || 655 (klass->is_instance_klass() && 656 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 657 ResourceMark rm(THREAD); 658 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 659 } 660 661 // Make shallow object copy 662 const int size = obj->size(); 663 oop new_obj_oop = NULL; 664 if (obj->is_array()) { 665 const int length = ((arrayOop)obj())->length(); 666 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 667 /* do_zero */ true, CHECK_NULL); 668 } else { 669 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 670 } 671 672 HeapAccess<>::clone(obj(), new_obj_oop, size); 673 674 Handle new_obj(THREAD, new_obj_oop); 675 // Caution: this involves a java upcall, so the clone should be 676 // "gc-robust" by this stage. 677 if (klass->has_finalizer()) { 678 assert(obj->is_instance(), "should be instanceOop"); 679 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 680 new_obj = Handle(THREAD, new_obj_oop); 681 } 682 683 return JNIHandles::make_local(env, new_obj()); 684 JVM_END 685 686 // java.io.File /////////////////////////////////////////////////////////////// 687 688 JVM_LEAF(char*, JVM_NativePath(char* path)) 689 JVMWrapper("JVM_NativePath"); 690 return os::native_path(path); 691 JVM_END 692 693 694 // Misc. class handling /////////////////////////////////////////////////////////// 695 696 697 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 698 JVMWrapper("JVM_GetCallerClass"); 699 700 // Getting the class of the caller frame. 701 // 702 // The call stack at this point looks something like this: 703 // 704 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 705 // [1] [ @CallerSensitive API.method ] 706 // [.] [ (skipped intermediate frames) ] 707 // [n] [ caller ] 708 vframeStream vfst(thread); 709 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 710 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 711 Method* m = vfst.method(); 712 assert(m != NULL, "sanity"); 713 switch (n) { 714 case 0: 715 // This must only be called from Reflection.getCallerClass 716 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 717 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 718 } 719 // fall-through 720 case 1: 721 // Frame 0 and 1 must be caller sensitive. 722 if (!m->caller_sensitive()) { 723 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 724 } 725 break; 726 default: 727 if (!m->is_ignored_by_security_stack_walk()) { 728 // We have reached the desired frame; return the holder class. 729 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 730 } 731 break; 732 } 733 } 734 return NULL; 735 JVM_END 736 737 738 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 739 JVMWrapper("JVM_FindPrimitiveClass"); 740 oop mirror = NULL; 741 BasicType t = name2type(utf); 742 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 743 mirror = Universe::java_mirror(t); 744 } 745 if (mirror == NULL) { 746 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 747 } else { 748 return (jclass) JNIHandles::make_local(env, mirror); 749 } 750 JVM_END 751 752 753 // Returns a class loaded by the bootstrap class loader; or null 754 // if not found. ClassNotFoundException is not thrown. 755 // FindClassFromBootLoader is exported to the launcher for windows. 756 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 757 const char* name)) 758 JVMWrapper("JVM_FindClassFromBootLoader"); 759 760 // Java libraries should ensure that name is never null... 761 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 762 // It's impossible to create this class; the name cannot fit 763 // into the constant pool. 764 return NULL; 765 } 766 767 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 768 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 769 if (k == NULL) { 770 return NULL; 771 } 772 773 if (log_is_enabled(Debug, class, resolve)) { 774 trace_class_resolution(k); 775 } 776 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 777 JVM_END 778 779 // Find a class with this name in this loader, using the caller's protection domain. 780 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 781 jboolean init, jobject loader, 782 jclass caller)) 783 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 784 // Java libraries should ensure that name is never null... 785 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 786 // It's impossible to create this class; the name cannot fit 787 // into the constant pool. 788 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 789 } 790 791 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 792 793 oop loader_oop = JNIHandles::resolve(loader); 794 oop from_class = JNIHandles::resolve(caller); 795 oop protection_domain = NULL; 796 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 797 // NPE. Put it in another way, the bootstrap class loader has all permission and 798 // thus no checkPackageAccess equivalence in the VM class loader. 799 // The caller is also passed as NULL by the java code if there is no security 800 // manager to avoid the performance cost of getting the calling class. 801 if (from_class != NULL && loader_oop != NULL) { 802 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 803 } 804 805 Handle h_loader(THREAD, loader_oop); 806 Handle h_prot(THREAD, protection_domain); 807 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 808 h_prot, false, THREAD); 809 810 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 811 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 812 } 813 return result; 814 JVM_END 815 816 // Currently only called from the old verifier. 817 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 818 jboolean init, jclass from)) 819 JVMWrapper("JVM_FindClassFromClass"); 820 if (name == NULL) { 821 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 822 } 823 if ((int)strlen(name) > Symbol::max_length()) { 824 // It's impossible to create this class; the name cannot fit 825 // into the constant pool. 826 Exceptions::fthrow(THREAD_AND_LOCATION, 827 vmSymbols::java_lang_NoClassDefFoundError(), 828 "Class name exceeds maximum length of %d: %s", 829 Symbol::max_length(), 830 name); 831 return 0; 832 } 833 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 834 oop from_class_oop = JNIHandles::resolve(from); 835 Klass* from_class = (from_class_oop == NULL) 836 ? (Klass*)NULL 837 : java_lang_Class::as_Klass(from_class_oop); 838 oop class_loader = NULL; 839 oop protection_domain = NULL; 840 if (from_class != NULL) { 841 class_loader = from_class->class_loader(); 842 protection_domain = from_class->protection_domain(); 843 } 844 Handle h_loader(THREAD, class_loader); 845 Handle h_prot (THREAD, protection_domain); 846 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 847 h_prot, true, thread); 848 if (result != NULL) { 849 oop mirror = JNIHandles::resolve_non_null(result); 850 Klass* to_class = java_lang_Class::as_Klass(mirror); 851 ClassLoaderData::class_loader_data(h_loader())->record_dependency(to_class); 852 } 853 854 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 855 // this function is generally only used for class loading during verification. 856 ResourceMark rm; 857 oop from_mirror = JNIHandles::resolve_non_null(from); 858 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 859 const char * from_name = from_class->external_name(); 860 861 oop mirror = JNIHandles::resolve_non_null(result); 862 Klass* to_class = java_lang_Class::as_Klass(mirror); 863 const char * to = to_class->external_name(); 864 log_debug(class, resolve)("%s %s (verification)", from_name, to); 865 } 866 867 return result; 868 JVM_END 869 870 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 871 if (loader.is_null()) { 872 return; 873 } 874 875 // check whether the current caller thread holds the lock or not. 876 // If not, increment the corresponding counter 877 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 878 ObjectSynchronizer::owner_self) { 879 counter->inc(); 880 } 881 } 882 883 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 884 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 885 jobject loader, const jbyte *buf, 886 jsize len, jobject pd, const char *source, 887 TRAPS) { 888 if (source == NULL) source = "__JVM_DefineClass__"; 889 890 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 891 JavaThread* jt = (JavaThread*) THREAD; 892 893 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 894 ClassLoader::perf_define_appclass_selftime(), 895 ClassLoader::perf_define_appclasses(), 896 jt->get_thread_stat()->perf_recursion_counts_addr(), 897 jt->get_thread_stat()->perf_timers_addr(), 898 PerfClassTraceTime::DEFINE_CLASS); 899 900 if (UsePerfData) { 901 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 902 } 903 904 // Since exceptions can be thrown, class initialization can take place 905 // if name is NULL no check for class name in .class stream has to be made. 906 TempNewSymbol class_name = NULL; 907 if (name != NULL) { 908 const int str_len = (int)strlen(name); 909 if (str_len > Symbol::max_length()) { 910 // It's impossible to create this class; the name cannot fit 911 // into the constant pool. 912 Exceptions::fthrow(THREAD_AND_LOCATION, 913 vmSymbols::java_lang_NoClassDefFoundError(), 914 "Class name exceeds maximum length of %d: %s", 915 Symbol::max_length(), 916 name); 917 return 0; 918 } 919 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 920 } 921 922 ResourceMark rm(THREAD); 923 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 924 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 925 if (UsePerfData) { 926 is_lock_held_by_thread(class_loader, 927 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 928 THREAD); 929 } 930 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 931 Klass* k = SystemDictionary::resolve_from_stream(class_name, 932 class_loader, 933 protection_domain, 934 &st, 935 CHECK_NULL); 936 937 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 938 trace_class_resolution(k); 939 } 940 941 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 942 } 943 944 945 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 946 JVMWrapper("JVM_DefineClass"); 947 948 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 949 JVM_END 950 951 952 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 953 JVMWrapper("JVM_DefineClassWithSource"); 954 955 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 956 JVM_END 957 958 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 959 JVMWrapper("JVM_FindLoadedClass"); 960 ResourceMark rm(THREAD); 961 962 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 963 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 964 965 const char* str = java_lang_String::as_utf8_string(string()); 966 // Sanity check, don't expect null 967 if (str == NULL) return NULL; 968 969 const int str_len = (int)strlen(str); 970 if (str_len > Symbol::max_length()) { 971 // It's impossible to create this class; the name cannot fit 972 // into the constant pool. 973 return NULL; 974 } 975 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 976 977 // Security Note: 978 // The Java level wrapper will perform the necessary security check allowing 979 // us to pass the NULL as the initiating class loader. 980 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 981 if (UsePerfData) { 982 is_lock_held_by_thread(h_loader, 983 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 984 THREAD); 985 } 986 987 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 988 h_loader, 989 Handle(), 990 CHECK_NULL); 991 #if INCLUDE_CDS 992 if (k == NULL) { 993 // If the class is not already loaded, try to see if it's in the shared 994 // archive for the current classloader (h_loader). 995 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 996 } 997 #endif 998 return (k == NULL) ? NULL : 999 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1000 JVM_END 1001 1002 // Module support ////////////////////////////////////////////////////////////////////////////// 1003 1004 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1005 jstring location, const char* const* packages, jsize num_packages)) 1006 JVMWrapper("JVM_DefineModule"); 1007 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1008 JVM_END 1009 1010 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1011 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1012 Modules::set_bootloader_unnamed_module(module, CHECK); 1013 JVM_END 1014 1015 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1016 JVMWrapper("JVM_AddModuleExports"); 1017 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1018 JVM_END 1019 1020 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1021 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1022 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1023 JVM_END 1024 1025 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1026 JVMWrapper("JVM_AddModuleExportsToAll"); 1027 Modules::add_module_exports(from_module, package, NULL, CHECK); 1028 JVM_END 1029 1030 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1031 JVMWrapper("JVM_AddReadsModule"); 1032 Modules::add_reads_module(from_module, source_module, CHECK); 1033 JVM_END 1034 1035 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1036 1037 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1038 assert (cls != NULL, "illegal class"); 1039 JVMWrapper("JVM_GetClassName"); 1040 JvmtiVMObjectAllocEventCollector oam; 1041 ResourceMark rm(THREAD); 1042 const char* name; 1043 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1044 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1045 } else { 1046 // Consider caching interned string in Klass 1047 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1048 assert(k->is_klass(), "just checking"); 1049 name = k->external_name(); 1050 } 1051 oop result = StringTable::intern((char*) name, CHECK_NULL); 1052 return (jstring) JNIHandles::make_local(env, result); 1053 JVM_END 1054 1055 1056 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1057 JVMWrapper("JVM_GetClassInterfaces"); 1058 JvmtiVMObjectAllocEventCollector oam; 1059 oop mirror = JNIHandles::resolve_non_null(cls); 1060 1061 // Special handling for primitive objects 1062 if (java_lang_Class::is_primitive(mirror)) { 1063 // Primitive objects does not have any interfaces 1064 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1065 return (jobjectArray) JNIHandles::make_local(env, r); 1066 } 1067 1068 Klass* klass = java_lang_Class::as_Klass(mirror); 1069 // Figure size of result array 1070 int size; 1071 if (klass->is_instance_klass()) { 1072 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1073 } else { 1074 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1075 size = 2; 1076 } 1077 1078 // Allocate result array 1079 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1080 objArrayHandle result (THREAD, r); 1081 // Fill in result 1082 if (klass->is_instance_klass()) { 1083 // Regular instance klass, fill in all local interfaces 1084 for (int index = 0; index < size; index++) { 1085 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1086 result->obj_at_put(index, k->java_mirror()); 1087 } 1088 } else { 1089 // All arrays implement java.lang.Cloneable and java.io.Serializable 1090 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1091 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1092 } 1093 return (jobjectArray) JNIHandles::make_local(env, result()); 1094 JVM_END 1095 1096 1097 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1098 JVMWrapper("JVM_IsInterface"); 1099 oop mirror = JNIHandles::resolve_non_null(cls); 1100 if (java_lang_Class::is_primitive(mirror)) { 1101 return JNI_FALSE; 1102 } 1103 Klass* k = java_lang_Class::as_Klass(mirror); 1104 jboolean result = k->is_interface(); 1105 assert(!result || k->is_instance_klass(), 1106 "all interfaces are instance types"); 1107 // The compiler intrinsic for isInterface tests the 1108 // Klass::_access_flags bits in the same way. 1109 return result; 1110 JVM_END 1111 1112 1113 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1114 JVMWrapper("JVM_GetClassSigners"); 1115 JvmtiVMObjectAllocEventCollector oam; 1116 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1117 // There are no signers for primitive types 1118 return NULL; 1119 } 1120 1121 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls))); 1122 1123 // If there are no signers set in the class, or if the class 1124 // is an array, return NULL. 1125 if (signers == NULL) return NULL; 1126 1127 // copy of the signers array 1128 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1129 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1130 for (int index = 0; index < signers->length(); index++) { 1131 signers_copy->obj_at_put(index, signers->obj_at(index)); 1132 } 1133 1134 // return the copy 1135 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1136 JVM_END 1137 1138 1139 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1140 JVMWrapper("JVM_SetClassSigners"); 1141 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1142 // This call is ignored for primitive types and arrays. 1143 // Signers are only set once, ClassLoader.java, and thus shouldn't 1144 // be called with an array. Only the bootstrap loader creates arrays. 1145 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1146 if (k->is_instance_klass()) { 1147 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1148 } 1149 } 1150 JVM_END 1151 1152 1153 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1154 JVMWrapper("JVM_GetProtectionDomain"); 1155 if (JNIHandles::resolve(cls) == NULL) { 1156 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1157 } 1158 1159 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1160 // Primitive types does not have a protection domain. 1161 return NULL; 1162 } 1163 1164 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1165 return (jobject) JNIHandles::make_local(env, pd); 1166 JVM_END 1167 1168 1169 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) { 1170 // If there is a security manager and protection domain, check the access 1171 // in the protection domain, otherwise it is authorized. 1172 if (java_lang_System::has_security_manager()) { 1173 1174 // For bootstrapping, if pd implies method isn't in the JDK, allow 1175 // this context to revert to older behavior. 1176 // In this case the isAuthorized field in AccessControlContext is also not 1177 // present. 1178 if (Universe::protection_domain_implies_method() == NULL) { 1179 return true; 1180 } 1181 1182 // Whitelist certain access control contexts 1183 if (java_security_AccessControlContext::is_authorized(context)) { 1184 return true; 1185 } 1186 1187 oop prot = klass->protection_domain(); 1188 if (prot != NULL) { 1189 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1190 // in the new wrapper. 1191 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1192 Handle h_prot(THREAD, prot); 1193 JavaValue result(T_BOOLEAN); 1194 JavaCallArguments args(h_prot); 1195 JavaCalls::call(&result, m, &args, CHECK_false); 1196 return (result.get_jboolean() != 0); 1197 } 1198 } 1199 return true; 1200 } 1201 1202 // Create an AccessControlContext with a protection domain with null codesource 1203 // and null permissions - which gives no permissions. 1204 oop create_dummy_access_control_context(TRAPS) { 1205 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1206 // Call constructor ProtectionDomain(null, null); 1207 Handle obj = JavaCalls::construct_new_instance(pd_klass, 1208 vmSymbols::codesource_permissioncollection_signature(), 1209 Handle(), Handle(), CHECK_NULL); 1210 1211 // new ProtectionDomain[] {pd}; 1212 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1213 context->obj_at_put(0, obj()); 1214 1215 // new AccessControlContext(new ProtectionDomain[] {pd}) 1216 objArrayHandle h_context(THREAD, context); 1217 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1218 return acc; 1219 } 1220 1221 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1222 JVMWrapper("JVM_DoPrivileged"); 1223 1224 if (action == NULL) { 1225 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1226 } 1227 1228 // Compute the frame initiating the do privileged operation and setup the privileged stack 1229 vframeStream vfst(thread); 1230 vfst.security_get_caller_frame(1); 1231 1232 if (vfst.at_end()) { 1233 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1234 } 1235 1236 Method* method = vfst.method(); 1237 InstanceKlass* klass = method->method_holder(); 1238 1239 // Check that action object understands "Object run()" 1240 Handle h_context; 1241 if (context != NULL) { 1242 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1243 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1244 if (!authorized) { 1245 // Create an unprivileged access control object and call it's run function 1246 // instead. 1247 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1248 h_context = Handle(THREAD, noprivs); 1249 } 1250 } 1251 1252 // Check that action object understands "Object run()" 1253 Handle object (THREAD, JNIHandles::resolve(action)); 1254 1255 // get run() method 1256 Method* m_oop = object->klass()->uncached_lookup_method( 1257 vmSymbols::run_method_name(), 1258 vmSymbols::void_object_signature(), 1259 Klass::find_overpass); 1260 1261 // See if there is a default method for "Object run()". 1262 if (m_oop == NULL && object->klass()->is_instance_klass()) { 1263 InstanceKlass* iklass = InstanceKlass::cast(object->klass()); 1264 m_oop = iklass->lookup_method_in_ordered_interfaces( 1265 vmSymbols::run_method_name(), 1266 vmSymbols::void_object_signature()); 1267 } 1268 1269 methodHandle m (THREAD, m_oop); 1270 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) { 1271 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1272 } 1273 1274 // Stack allocated list of privileged stack elements 1275 PrivilegedElement pi; 1276 if (!vfst.at_end()) { 1277 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1278 thread->set_privileged_stack_top(&pi); 1279 } 1280 1281 1282 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1283 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1284 Handle pending_exception; 1285 JavaValue result(T_OBJECT); 1286 JavaCallArguments args(object); 1287 JavaCalls::call(&result, m, &args, THREAD); 1288 1289 // done with action, remove ourselves from the list 1290 if (!vfst.at_end()) { 1291 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1292 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1293 } 1294 1295 if (HAS_PENDING_EXCEPTION) { 1296 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1297 CLEAR_PENDING_EXCEPTION; 1298 // JVMTI has already reported the pending exception 1299 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1300 if (THREAD->is_Java_thread()) { 1301 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1302 } 1303 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1304 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1305 // Throw a java.security.PrivilegedActionException(Exception e) exception 1306 JavaCallArguments args(pending_exception); 1307 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1308 vmSymbols::exception_void_signature(), 1309 &args); 1310 } 1311 } 1312 1313 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1314 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1315 JVM_END 1316 1317 1318 // Returns the inherited_access_control_context field of the running thread. 1319 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1320 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1321 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1322 return JNIHandles::make_local(env, result); 1323 JVM_END 1324 1325 class RegisterArrayForGC { 1326 private: 1327 JavaThread *_thread; 1328 public: 1329 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1330 _thread = thread; 1331 _thread->register_array_for_gc(array); 1332 } 1333 1334 ~RegisterArrayForGC() { 1335 _thread->register_array_for_gc(NULL); 1336 } 1337 }; 1338 1339 1340 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1341 JVMWrapper("JVM_GetStackAccessControlContext"); 1342 if (!UsePrivilegedStack) return NULL; 1343 1344 ResourceMark rm(THREAD); 1345 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1346 JvmtiVMObjectAllocEventCollector oam; 1347 1348 // count the protection domains on the execution stack. We collapse 1349 // duplicate consecutive protection domains into a single one, as 1350 // well as stopping when we hit a privileged frame. 1351 1352 // Use vframeStream to iterate through Java frames 1353 vframeStream vfst(thread); 1354 1355 oop previous_protection_domain = NULL; 1356 Handle privileged_context(thread, NULL); 1357 bool is_privileged = false; 1358 oop protection_domain = NULL; 1359 1360 for(; !vfst.at_end(); vfst.next()) { 1361 // get method of frame 1362 Method* method = vfst.method(); 1363 intptr_t* frame_id = vfst.frame_id(); 1364 1365 // check the privileged frames to see if we have a match 1366 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1367 // this frame is privileged 1368 is_privileged = true; 1369 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1370 protection_domain = thread->privileged_stack_top()->protection_domain(); 1371 } else { 1372 protection_domain = method->method_holder()->protection_domain(); 1373 } 1374 1375 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) { 1376 local_array->push(protection_domain); 1377 previous_protection_domain = protection_domain; 1378 } 1379 1380 if (is_privileged) break; 1381 } 1382 1383 1384 // either all the domains on the stack were system domains, or 1385 // we had a privileged system domain 1386 if (local_array->is_empty()) { 1387 if (is_privileged && privileged_context.is_null()) return NULL; 1388 1389 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1390 return JNIHandles::make_local(env, result); 1391 } 1392 1393 // the resource area must be registered in case of a gc 1394 RegisterArrayForGC ragc(thread, local_array); 1395 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1396 local_array->length(), CHECK_NULL); 1397 objArrayHandle h_context(thread, context); 1398 for (int index = 0; index < local_array->length(); index++) { 1399 h_context->obj_at_put(index, local_array->at(index)); 1400 } 1401 1402 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1403 1404 return JNIHandles::make_local(env, result); 1405 JVM_END 1406 1407 1408 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1409 JVMWrapper("JVM_IsArrayClass"); 1410 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1411 return (k != NULL) && k->is_array_klass() ? true : false; 1412 JVM_END 1413 1414 1415 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1416 JVMWrapper("JVM_IsPrimitiveClass"); 1417 oop mirror = JNIHandles::resolve_non_null(cls); 1418 return (jboolean) java_lang_Class::is_primitive(mirror); 1419 JVM_END 1420 1421 1422 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1423 JVMWrapper("JVM_GetClassModifiers"); 1424 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1425 // Primitive type 1426 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1427 } 1428 1429 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1430 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1431 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1432 return k->modifier_flags(); 1433 JVM_END 1434 1435 1436 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1437 1438 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1439 JvmtiVMObjectAllocEventCollector oam; 1440 // ofClass is a reference to a java_lang_Class object. The mirror object 1441 // of an InstanceKlass 1442 1443 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1444 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1445 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1446 return (jobjectArray)JNIHandles::make_local(env, result); 1447 } 1448 1449 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1450 InnerClassesIterator iter(k); 1451 1452 if (iter.length() == 0) { 1453 // Neither an inner nor outer class 1454 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1455 return (jobjectArray)JNIHandles::make_local(env, result); 1456 } 1457 1458 // find inner class info 1459 constantPoolHandle cp(thread, k->constants()); 1460 int length = iter.length(); 1461 1462 // Allocate temp. result array 1463 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1464 objArrayHandle result (THREAD, r); 1465 int members = 0; 1466 1467 for (; !iter.done(); iter.next()) { 1468 int ioff = iter.inner_class_info_index(); 1469 int ooff = iter.outer_class_info_index(); 1470 1471 if (ioff != 0 && ooff != 0) { 1472 // Check to see if the name matches the class we're looking for 1473 // before attempting to find the class. 1474 if (cp->klass_name_at_matches(k, ooff)) { 1475 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1476 if (outer_klass == k) { 1477 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1478 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1479 1480 // Throws an exception if outer klass has not declared k as 1481 // an inner klass 1482 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1483 1484 result->obj_at_put(members, inner_klass->java_mirror()); 1485 members++; 1486 } 1487 } 1488 } 1489 } 1490 1491 if (members != length) { 1492 // Return array of right length 1493 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1494 for(int i = 0; i < members; i++) { 1495 res->obj_at_put(i, result->obj_at(i)); 1496 } 1497 return (jobjectArray)JNIHandles::make_local(env, res); 1498 } 1499 1500 return (jobjectArray)JNIHandles::make_local(env, result()); 1501 JVM_END 1502 1503 1504 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1505 { 1506 // ofClass is a reference to a java_lang_Class object. 1507 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1508 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1509 return NULL; 1510 } 1511 1512 bool inner_is_member = false; 1513 Klass* outer_klass 1514 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1515 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1516 if (outer_klass == NULL) return NULL; // already a top-level class 1517 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1518 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1519 } 1520 JVM_END 1521 1522 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1523 { 1524 oop mirror = JNIHandles::resolve_non_null(cls); 1525 if (java_lang_Class::is_primitive(mirror) || 1526 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1527 return NULL; 1528 } 1529 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1530 int ooff = 0, noff = 0; 1531 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1532 if (noff != 0) { 1533 constantPoolHandle i_cp(thread, k->constants()); 1534 Symbol* name = i_cp->symbol_at(noff); 1535 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1536 return (jstring) JNIHandles::make_local(env, str()); 1537 } 1538 } 1539 return NULL; 1540 } 1541 JVM_END 1542 1543 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1544 assert (cls != NULL, "illegal class"); 1545 JVMWrapper("JVM_GetClassSignature"); 1546 JvmtiVMObjectAllocEventCollector oam; 1547 ResourceMark rm(THREAD); 1548 // Return null for arrays and primatives 1549 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1550 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1551 if (k->is_instance_klass()) { 1552 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1553 if (sym == NULL) return NULL; 1554 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1555 return (jstring) JNIHandles::make_local(env, str()); 1556 } 1557 } 1558 return NULL; 1559 JVM_END 1560 1561 1562 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1563 assert (cls != NULL, "illegal class"); 1564 JVMWrapper("JVM_GetClassAnnotations"); 1565 1566 // Return null for arrays and primitives 1567 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1568 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1569 if (k->is_instance_klass()) { 1570 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1571 return (jbyteArray) JNIHandles::make_local(env, a); 1572 } 1573 } 1574 return NULL; 1575 JVM_END 1576 1577 1578 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1579 // some of this code was adapted from from jni_FromReflectedField 1580 1581 oop reflected = JNIHandles::resolve_non_null(field); 1582 oop mirror = java_lang_reflect_Field::clazz(reflected); 1583 Klass* k = java_lang_Class::as_Klass(mirror); 1584 int slot = java_lang_reflect_Field::slot(reflected); 1585 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1586 1587 InstanceKlass* ik = InstanceKlass::cast(k); 1588 intptr_t offset = ik->field_offset(slot); 1589 1590 if (modifiers & JVM_ACC_STATIC) { 1591 // for static fields we only look in the current class 1592 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1593 assert(false, "cannot find static field"); 1594 return false; 1595 } 1596 } else { 1597 // for instance fields we start with the current class and work 1598 // our way up through the superclass chain 1599 if (!ik->find_field_from_offset(offset, false, &fd)) { 1600 assert(false, "cannot find instance field"); 1601 return false; 1602 } 1603 } 1604 return true; 1605 } 1606 1607 static Method* jvm_get_method_common(jobject method) { 1608 // some of this code was adapted from from jni_FromReflectedMethod 1609 1610 oop reflected = JNIHandles::resolve_non_null(method); 1611 oop mirror = NULL; 1612 int slot = 0; 1613 1614 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1615 mirror = java_lang_reflect_Constructor::clazz(reflected); 1616 slot = java_lang_reflect_Constructor::slot(reflected); 1617 } else { 1618 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1619 "wrong type"); 1620 mirror = java_lang_reflect_Method::clazz(reflected); 1621 slot = java_lang_reflect_Method::slot(reflected); 1622 } 1623 Klass* k = java_lang_Class::as_Klass(mirror); 1624 1625 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1626 assert(m != NULL, "cannot find method"); 1627 return m; // caller has to deal with NULL in product mode 1628 } 1629 1630 /* Type use annotations support (JDK 1.8) */ 1631 1632 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1633 assert (cls != NULL, "illegal class"); 1634 JVMWrapper("JVM_GetClassTypeAnnotations"); 1635 ResourceMark rm(THREAD); 1636 // Return null for arrays and primitives 1637 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1638 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1639 if (k->is_instance_klass()) { 1640 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1641 if (type_annotations != NULL) { 1642 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1643 return (jbyteArray) JNIHandles::make_local(env, a); 1644 } 1645 } 1646 } 1647 return NULL; 1648 JVM_END 1649 1650 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1651 assert (method != NULL, "illegal method"); 1652 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1653 1654 // method is a handle to a java.lang.reflect.Method object 1655 Method* m = jvm_get_method_common(method); 1656 if (m == NULL) { 1657 return NULL; 1658 } 1659 1660 AnnotationArray* type_annotations = m->type_annotations(); 1661 if (type_annotations != NULL) { 1662 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1663 return (jbyteArray) JNIHandles::make_local(env, a); 1664 } 1665 1666 return NULL; 1667 JVM_END 1668 1669 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1670 assert (field != NULL, "illegal field"); 1671 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1672 1673 fieldDescriptor fd; 1674 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1675 if (!gotFd) { 1676 return NULL; 1677 } 1678 1679 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1680 JVM_END 1681 1682 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1683 if (!cp->is_within_bounds(index)) { 1684 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1685 } 1686 } 1687 1688 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1689 { 1690 JVMWrapper("JVM_GetMethodParameters"); 1691 // method is a handle to a java.lang.reflect.Method object 1692 Method* method_ptr = jvm_get_method_common(method); 1693 methodHandle mh (THREAD, method_ptr); 1694 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1695 const int num_params = mh->method_parameters_length(); 1696 1697 if (num_params < 0) { 1698 // A -1 return value from method_parameters_length means there is no 1699 // parameter data. Return null to indicate this to the reflection 1700 // API. 1701 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1702 return (jobjectArray)NULL; 1703 } else { 1704 // Otherwise, we return something up to reflection, even if it is 1705 // a zero-length array. Why? Because in some cases this can 1706 // trigger a MalformedParametersException. 1707 1708 // make sure all the symbols are properly formatted 1709 for (int i = 0; i < num_params; i++) { 1710 MethodParametersElement* params = mh->method_parameters_start(); 1711 int index = params[i].name_cp_index; 1712 bounds_check(mh->constants(), index, CHECK_NULL); 1713 1714 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1715 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1716 "Wrong type at constant pool index"); 1717 } 1718 1719 } 1720 1721 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1722 objArrayHandle result (THREAD, result_oop); 1723 1724 for (int i = 0; i < num_params; i++) { 1725 MethodParametersElement* params = mh->method_parameters_start(); 1726 // For a 0 index, give a NULL symbol 1727 Symbol* sym = 0 != params[i].name_cp_index ? 1728 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1729 int flags = params[i].flags; 1730 oop param = Reflection::new_parameter(reflected_method, i, sym, 1731 flags, CHECK_NULL); 1732 result->obj_at_put(i, param); 1733 } 1734 return (jobjectArray)JNIHandles::make_local(env, result()); 1735 } 1736 } 1737 JVM_END 1738 1739 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1740 1741 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1742 { 1743 JVMWrapper("JVM_GetClassDeclaredFields"); 1744 JvmtiVMObjectAllocEventCollector oam; 1745 1746 // Exclude primitive types and array types 1747 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1748 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1749 // Return empty array 1750 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1751 return (jobjectArray) JNIHandles::make_local(env, res); 1752 } 1753 1754 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1755 constantPoolHandle cp(THREAD, k->constants()); 1756 1757 // Ensure class is linked 1758 k->link_class(CHECK_NULL); 1759 1760 // Allocate result 1761 int num_fields; 1762 1763 if (publicOnly) { 1764 num_fields = 0; 1765 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1766 if (fs.access_flags().is_public()) ++num_fields; 1767 } 1768 } else { 1769 num_fields = k->java_fields_count(); 1770 } 1771 1772 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1773 objArrayHandle result (THREAD, r); 1774 1775 int out_idx = 0; 1776 fieldDescriptor fd; 1777 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1778 if (!publicOnly || fs.access_flags().is_public()) { 1779 fd.reinitialize(k, fs.index()); 1780 oop field = Reflection::new_field(&fd, CHECK_NULL); 1781 result->obj_at_put(out_idx, field); 1782 ++out_idx; 1783 } 1784 } 1785 assert(out_idx == num_fields, "just checking"); 1786 return (jobjectArray) JNIHandles::make_local(env, result()); 1787 } 1788 JVM_END 1789 1790 static bool select_method(const methodHandle& method, bool want_constructor) { 1791 if (want_constructor) { 1792 return (method->is_initializer() && !method->is_static()); 1793 } else { 1794 return (!method->is_initializer() && !method->is_overpass()); 1795 } 1796 } 1797 1798 static jobjectArray get_class_declared_methods_helper( 1799 JNIEnv *env, 1800 jclass ofClass, jboolean publicOnly, 1801 bool want_constructor, 1802 Klass* klass, TRAPS) { 1803 1804 JvmtiVMObjectAllocEventCollector oam; 1805 1806 // Exclude primitive types and array types 1807 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1808 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1809 // Return empty array 1810 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1811 return (jobjectArray) JNIHandles::make_local(env, res); 1812 } 1813 1814 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1815 1816 // Ensure class is linked 1817 k->link_class(CHECK_NULL); 1818 1819 Array<Method*>* methods = k->methods(); 1820 int methods_length = methods->length(); 1821 1822 // Save original method_idnum in case of redefinition, which can change 1823 // the idnum of obsolete methods. The new method will have the same idnum 1824 // but if we refresh the methods array, the counts will be wrong. 1825 ResourceMark rm(THREAD); 1826 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1827 int num_methods = 0; 1828 1829 for (int i = 0; i < methods_length; i++) { 1830 methodHandle method(THREAD, methods->at(i)); 1831 if (select_method(method, want_constructor)) { 1832 if (!publicOnly || method->is_public()) { 1833 idnums->push(method->method_idnum()); 1834 ++num_methods; 1835 } 1836 } 1837 } 1838 1839 // Allocate result 1840 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1841 objArrayHandle result (THREAD, r); 1842 1843 // Now just put the methods that we selected above, but go by their idnum 1844 // in case of redefinition. The methods can be redefined at any safepoint, 1845 // so above when allocating the oop array and below when creating reflect 1846 // objects. 1847 for (int i = 0; i < num_methods; i++) { 1848 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1849 if (method.is_null()) { 1850 // Method may have been deleted and seems this API can handle null 1851 // Otherwise should probably put a method that throws NSME 1852 result->obj_at_put(i, NULL); 1853 } else { 1854 oop m; 1855 if (want_constructor) { 1856 m = Reflection::new_constructor(method, CHECK_NULL); 1857 } else { 1858 m = Reflection::new_method(method, false, CHECK_NULL); 1859 } 1860 result->obj_at_put(i, m); 1861 } 1862 } 1863 1864 return (jobjectArray) JNIHandles::make_local(env, result()); 1865 } 1866 1867 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1868 { 1869 JVMWrapper("JVM_GetClassDeclaredMethods"); 1870 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1871 /*want_constructor*/ false, 1872 SystemDictionary::reflect_Method_klass(), THREAD); 1873 } 1874 JVM_END 1875 1876 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1877 { 1878 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1879 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1880 /*want_constructor*/ true, 1881 SystemDictionary::reflect_Constructor_klass(), THREAD); 1882 } 1883 JVM_END 1884 1885 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1886 { 1887 JVMWrapper("JVM_GetClassAccessFlags"); 1888 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1889 // Primitive type 1890 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1891 } 1892 1893 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1894 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1895 } 1896 JVM_END 1897 1898 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1899 { 1900 JVMWrapper("JVM_AreNestMates"); 1901 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1902 assert(c->is_instance_klass(), "must be"); 1903 InstanceKlass* ck = InstanceKlass::cast(c); 1904 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 1905 assert(m->is_instance_klass(), "must be"); 1906 InstanceKlass* mk = InstanceKlass::cast(m); 1907 return ck->has_nestmate_access_to(mk, THREAD); 1908 } 1909 JVM_END 1910 1911 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1912 { 1913 // current is not a primitive or array class 1914 JVMWrapper("JVM_GetNestHost"); 1915 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1916 assert(c->is_instance_klass(), "must be"); 1917 InstanceKlass* ck = InstanceKlass::cast(c); 1918 // Don't post exceptions if validation fails 1919 InstanceKlass* host = ck->nest_host(NULL, THREAD); 1920 return (jclass) (host == NULL ? NULL : 1921 JNIHandles::make_local(THREAD, host->java_mirror())); 1922 } 1923 JVM_END 1924 1925 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1926 { 1927 // current is not a primitive or array class 1928 JVMWrapper("JVM_GetNestMembers"); 1929 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1930 assert(c->is_instance_klass(), "must be"); 1931 InstanceKlass* ck = InstanceKlass::cast(c); 1932 // Get the nest host for this nest - throw ICCE if validation fails 1933 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError(); 1934 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL); 1935 1936 { 1937 JvmtiVMObjectAllocEventCollector oam; 1938 Array<u2>* members = host->nest_members(); 1939 int length = members == NULL ? 0 : members->length(); 1940 // nest host is first in the array so make it one bigger 1941 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 1942 length + 1, CHECK_NULL); 1943 objArrayHandle result (THREAD, r); 1944 result->obj_at_put(0, host->java_mirror()); 1945 if (length != 0) { 1946 int i; 1947 for (i = 0; i < length; i++) { 1948 int cp_index = members->at(i); 1949 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL); 1950 if (k->is_instance_klass()) { 1951 InstanceKlass* nest_host_k = 1952 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL); 1953 if (nest_host_k == host) { 1954 result->obj_at_put(i+1, k->java_mirror()); 1955 } 1956 else { 1957 // k's nest host is legal but it isn't our host so 1958 // throw ICCE 1959 ResourceMark rm(THREAD); 1960 Exceptions::fthrow(THREAD_AND_LOCATION, 1961 icce, 1962 "Nest member %s in %s declares a different nest host of %s", 1963 k->external_name(), 1964 host->external_name(), 1965 nest_host_k->external_name() 1966 ); 1967 return NULL; 1968 } 1969 } 1970 else { 1971 // we have a bad nest member entry - throw ICCE 1972 ResourceMark rm(THREAD); 1973 Exceptions::fthrow(THREAD_AND_LOCATION, 1974 icce, 1975 "Class %s can not be a nest member of %s", 1976 k->external_name(), 1977 host->external_name() 1978 ); 1979 return NULL; 1980 } 1981 } 1982 } 1983 else { 1984 assert(host == ck, "must be singleton nest"); 1985 } 1986 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1987 } 1988 } 1989 JVM_END 1990 1991 // Constant pool access ////////////////////////////////////////////////////////// 1992 1993 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1994 { 1995 JVMWrapper("JVM_GetClassConstantPool"); 1996 JvmtiVMObjectAllocEventCollector oam; 1997 1998 // Return null for primitives and arrays 1999 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 2000 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2001 if (k->is_instance_klass()) { 2002 InstanceKlass* k_h = InstanceKlass::cast(k); 2003 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2004 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2005 return JNIHandles::make_local(jcp()); 2006 } 2007 } 2008 return NULL; 2009 } 2010 JVM_END 2011 2012 2013 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2014 { 2015 JVMWrapper("JVM_ConstantPoolGetSize"); 2016 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2017 return cp->length(); 2018 } 2019 JVM_END 2020 2021 2022 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2023 { 2024 JVMWrapper("JVM_ConstantPoolGetClassAt"); 2025 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2026 bounds_check(cp, index, CHECK_NULL); 2027 constantTag tag = cp->tag_at(index); 2028 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2029 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2030 } 2031 Klass* k = cp->klass_at(index, CHECK_NULL); 2032 return (jclass) JNIHandles::make_local(k->java_mirror()); 2033 } 2034 JVM_END 2035 2036 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2037 { 2038 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 2039 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2040 bounds_check(cp, index, CHECK_NULL); 2041 constantTag tag = cp->tag_at(index); 2042 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2043 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2044 } 2045 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2046 if (k == NULL) return NULL; 2047 return (jclass) JNIHandles::make_local(k->java_mirror()); 2048 } 2049 JVM_END 2050 2051 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2052 constantTag tag = cp->tag_at(index); 2053 if (!tag.is_method() && !tag.is_interface_method()) { 2054 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2055 } 2056 int klass_ref = cp->uncached_klass_ref_index_at(index); 2057 Klass* k_o; 2058 if (force_resolution) { 2059 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2060 } else { 2061 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2062 if (k_o == NULL) return NULL; 2063 } 2064 InstanceKlass* k = InstanceKlass::cast(k_o); 2065 Symbol* name = cp->uncached_name_ref_at(index); 2066 Symbol* sig = cp->uncached_signature_ref_at(index); 2067 methodHandle m (THREAD, k->find_method(name, sig)); 2068 if (m.is_null()) { 2069 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2070 } 2071 oop method; 2072 if (!m->is_initializer() || m->is_static()) { 2073 method = Reflection::new_method(m, true, CHECK_NULL); 2074 } else { 2075 method = Reflection::new_constructor(m, CHECK_NULL); 2076 } 2077 return JNIHandles::make_local(method); 2078 } 2079 2080 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2081 { 2082 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 2083 JvmtiVMObjectAllocEventCollector oam; 2084 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2085 bounds_check(cp, index, CHECK_NULL); 2086 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2087 return res; 2088 } 2089 JVM_END 2090 2091 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2092 { 2093 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2094 JvmtiVMObjectAllocEventCollector oam; 2095 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2096 bounds_check(cp, index, CHECK_NULL); 2097 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2098 return res; 2099 } 2100 JVM_END 2101 2102 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2103 constantTag tag = cp->tag_at(index); 2104 if (!tag.is_field()) { 2105 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2106 } 2107 int klass_ref = cp->uncached_klass_ref_index_at(index); 2108 Klass* k_o; 2109 if (force_resolution) { 2110 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2111 } else { 2112 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2113 if (k_o == NULL) return NULL; 2114 } 2115 InstanceKlass* k = InstanceKlass::cast(k_o); 2116 Symbol* name = cp->uncached_name_ref_at(index); 2117 Symbol* sig = cp->uncached_signature_ref_at(index); 2118 fieldDescriptor fd; 2119 Klass* target_klass = k->find_field(name, sig, &fd); 2120 if (target_klass == NULL) { 2121 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2122 } 2123 oop field = Reflection::new_field(&fd, CHECK_NULL); 2124 return JNIHandles::make_local(field); 2125 } 2126 2127 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2128 { 2129 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2130 JvmtiVMObjectAllocEventCollector oam; 2131 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2132 bounds_check(cp, index, CHECK_NULL); 2133 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2134 return res; 2135 } 2136 JVM_END 2137 2138 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2139 { 2140 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2141 JvmtiVMObjectAllocEventCollector oam; 2142 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2143 bounds_check(cp, index, CHECK_NULL); 2144 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2145 return res; 2146 } 2147 JVM_END 2148 2149 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2150 { 2151 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2152 JvmtiVMObjectAllocEventCollector oam; 2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2154 bounds_check(cp, index, CHECK_NULL); 2155 constantTag tag = cp->tag_at(index); 2156 if (!tag.is_field_or_method()) { 2157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2158 } 2159 int klass_ref = cp->uncached_klass_ref_index_at(index); 2160 Symbol* klass_name = cp->klass_name_at(klass_ref); 2161 Symbol* member_name = cp->uncached_name_ref_at(index); 2162 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2163 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2164 objArrayHandle dest(THREAD, dest_o); 2165 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2166 dest->obj_at_put(0, str()); 2167 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2168 dest->obj_at_put(1, str()); 2169 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2170 dest->obj_at_put(2, str()); 2171 return (jobjectArray) JNIHandles::make_local(dest()); 2172 } 2173 JVM_END 2174 2175 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2176 { 2177 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2178 JvmtiVMObjectAllocEventCollector oam; 2179 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2180 bounds_check(cp, index, CHECK_0); 2181 constantTag tag = cp->tag_at(index); 2182 if (!tag.is_field_or_method()) { 2183 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2184 } 2185 return (jint) cp->uncached_klass_ref_index_at(index); 2186 } 2187 JVM_END 2188 2189 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2190 { 2191 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2192 JvmtiVMObjectAllocEventCollector oam; 2193 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2194 bounds_check(cp, index, CHECK_0); 2195 constantTag tag = cp->tag_at(index); 2196 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2197 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2198 } 2199 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2200 } 2201 JVM_END 2202 2203 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2204 { 2205 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2206 JvmtiVMObjectAllocEventCollector oam; 2207 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2208 bounds_check(cp, index, CHECK_NULL); 2209 constantTag tag = cp->tag_at(index); 2210 if (!tag.is_name_and_type()) { 2211 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2212 } 2213 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2214 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2215 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2216 objArrayHandle dest(THREAD, dest_o); 2217 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2218 dest->obj_at_put(0, str()); 2219 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2220 dest->obj_at_put(1, str()); 2221 return (jobjectArray) JNIHandles::make_local(dest()); 2222 } 2223 JVM_END 2224 2225 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2226 { 2227 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2228 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2229 bounds_check(cp, index, CHECK_0); 2230 constantTag tag = cp->tag_at(index); 2231 if (!tag.is_int()) { 2232 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2233 } 2234 return cp->int_at(index); 2235 } 2236 JVM_END 2237 2238 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2239 { 2240 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2241 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2242 bounds_check(cp, index, CHECK_(0L)); 2243 constantTag tag = cp->tag_at(index); 2244 if (!tag.is_long()) { 2245 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2246 } 2247 return cp->long_at(index); 2248 } 2249 JVM_END 2250 2251 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2252 { 2253 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2254 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2255 bounds_check(cp, index, CHECK_(0.0f)); 2256 constantTag tag = cp->tag_at(index); 2257 if (!tag.is_float()) { 2258 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2259 } 2260 return cp->float_at(index); 2261 } 2262 JVM_END 2263 2264 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2265 { 2266 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2267 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2268 bounds_check(cp, index, CHECK_(0.0)); 2269 constantTag tag = cp->tag_at(index); 2270 if (!tag.is_double()) { 2271 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2272 } 2273 return cp->double_at(index); 2274 } 2275 JVM_END 2276 2277 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2278 { 2279 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2280 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2281 bounds_check(cp, index, CHECK_NULL); 2282 constantTag tag = cp->tag_at(index); 2283 if (!tag.is_string()) { 2284 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2285 } 2286 oop str = cp->string_at(index, CHECK_NULL); 2287 return (jstring) JNIHandles::make_local(str); 2288 } 2289 JVM_END 2290 2291 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2292 { 2293 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2294 JvmtiVMObjectAllocEventCollector oam; 2295 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2296 bounds_check(cp, index, CHECK_NULL); 2297 constantTag tag = cp->tag_at(index); 2298 if (!tag.is_symbol()) { 2299 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2300 } 2301 Symbol* sym = cp->symbol_at(index); 2302 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2303 return (jstring) JNIHandles::make_local(str()); 2304 } 2305 JVM_END 2306 2307 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2308 { 2309 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2310 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2311 bounds_check(cp, index, CHECK_0); 2312 constantTag tag = cp->tag_at(index); 2313 jbyte result = tag.value(); 2314 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2315 // they are changed to the corresponding tags from the JVM spec, so that java code in 2316 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2317 if (tag.is_klass_or_reference()) { 2318 result = JVM_CONSTANT_Class; 2319 } else if (tag.is_string_index()) { 2320 result = JVM_CONSTANT_String; 2321 } else if (tag.is_method_type_in_error()) { 2322 result = JVM_CONSTANT_MethodType; 2323 } else if (tag.is_method_handle_in_error()) { 2324 result = JVM_CONSTANT_MethodHandle; 2325 } else if (tag.is_dynamic_constant_in_error()) { 2326 result = JVM_CONSTANT_Dynamic; 2327 } 2328 return result; 2329 } 2330 JVM_END 2331 2332 // Assertion support. ////////////////////////////////////////////////////////// 2333 2334 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2335 JVMWrapper("JVM_DesiredAssertionStatus"); 2336 assert(cls != NULL, "bad class"); 2337 2338 oop r = JNIHandles::resolve(cls); 2339 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2340 if (java_lang_Class::is_primitive(r)) return false; 2341 2342 Klass* k = java_lang_Class::as_Klass(r); 2343 assert(k->is_instance_klass(), "must be an instance klass"); 2344 if (!k->is_instance_klass()) return false; 2345 2346 ResourceMark rm(THREAD); 2347 const char* name = k->name()->as_C_string(); 2348 bool system_class = k->class_loader() == NULL; 2349 return JavaAssertions::enabled(name, system_class); 2350 2351 JVM_END 2352 2353 2354 // Return a new AssertionStatusDirectives object with the fields filled in with 2355 // command-line assertion arguments (i.e., -ea, -da). 2356 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2357 JVMWrapper("JVM_AssertionStatusDirectives"); 2358 JvmtiVMObjectAllocEventCollector oam; 2359 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2360 return JNIHandles::make_local(env, asd); 2361 JVM_END 2362 2363 // Verification //////////////////////////////////////////////////////////////////////////////// 2364 2365 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2366 2367 // RedefineClasses support: bug 6214132 caused verification to fail. 2368 // All functions from this section should call the jvmtiThreadSate function: 2369 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2370 // The function returns a Klass* of the _scratch_class if the verifier 2371 // was invoked in the middle of the class redefinition. 2372 // Otherwise it returns its argument value which is the _the_class Klass*. 2373 // Please, refer to the description in the jvmtiThreadSate.hpp. 2374 2375 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2376 JVMWrapper("JVM_GetClassNameUTF"); 2377 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2378 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2379 return k->name()->as_utf8(); 2380 JVM_END 2381 2382 2383 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2384 JVMWrapper("JVM_GetClassCPTypes"); 2385 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2386 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2387 // types will have length zero if this is not an InstanceKlass 2388 // (length is determined by call to JVM_GetClassCPEntriesCount) 2389 if (k->is_instance_klass()) { 2390 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2391 for (int index = cp->length() - 1; index >= 0; index--) { 2392 constantTag tag = cp->tag_at(index); 2393 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2394 } 2395 } 2396 JVM_END 2397 2398 2399 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2400 JVMWrapper("JVM_GetClassCPEntriesCount"); 2401 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2402 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2403 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2404 JVM_END 2405 2406 2407 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2408 JVMWrapper("JVM_GetClassFieldsCount"); 2409 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2410 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2411 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2412 JVM_END 2413 2414 2415 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2416 JVMWrapper("JVM_GetClassMethodsCount"); 2417 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2418 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2419 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2420 JVM_END 2421 2422 2423 // The following methods, used for the verifier, are never called with 2424 // array klasses, so a direct cast to InstanceKlass is safe. 2425 // Typically, these methods are called in a loop with bounds determined 2426 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2427 // zero for arrays. 2428 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2429 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2430 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2431 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2432 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2433 int length = method->checked_exceptions_length(); 2434 if (length > 0) { 2435 CheckedExceptionElement* table= method->checked_exceptions_start(); 2436 for (int i = 0; i < length; i++) { 2437 exceptions[i] = table[i].class_cp_index; 2438 } 2439 } 2440 JVM_END 2441 2442 2443 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2444 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2445 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2446 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2447 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2448 return method->checked_exceptions_length(); 2449 JVM_END 2450 2451 2452 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2453 JVMWrapper("JVM_GetMethodIxByteCode"); 2454 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2455 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2456 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2457 memcpy(code, method->code_base(), method->code_size()); 2458 JVM_END 2459 2460 2461 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2462 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2463 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2464 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2465 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2466 return method->code_size(); 2467 JVM_END 2468 2469 2470 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2471 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 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 ExceptionTable extable(method); 2476 entry->start_pc = extable.start_pc(entry_index); 2477 entry->end_pc = extable.end_pc(entry_index); 2478 entry->handler_pc = extable.handler_pc(entry_index); 2479 entry->catchType = extable.catch_type_index(entry_index); 2480 JVM_END 2481 2482 2483 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2484 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2485 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2486 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2487 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2488 return method->exception_table_length(); 2489 JVM_END 2490 2491 2492 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2493 JVMWrapper("JVM_GetMethodIxModifiers"); 2494 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2495 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2496 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2497 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2498 JVM_END 2499 2500 2501 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2502 JVMWrapper("JVM_GetFieldIxModifiers"); 2503 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2504 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2505 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2506 JVM_END 2507 2508 2509 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2510 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2511 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2512 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2513 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2514 return method->max_locals(); 2515 JVM_END 2516 2517 2518 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2519 JVMWrapper("JVM_GetMethodIxArgsSize"); 2520 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2521 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2522 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2523 return method->size_of_parameters(); 2524 JVM_END 2525 2526 2527 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2528 JVMWrapper("JVM_GetMethodIxMaxStack"); 2529 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2530 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2531 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2532 return method->verifier_max_stack(); 2533 JVM_END 2534 2535 2536 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2537 JVMWrapper("JVM_IsConstructorIx"); 2538 ResourceMark rm(THREAD); 2539 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2540 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2541 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2542 return method->name() == vmSymbols::object_initializer_name(); 2543 JVM_END 2544 2545 2546 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2547 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2548 ResourceMark rm(THREAD); 2549 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2550 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2551 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2552 return method->is_overpass(); 2553 JVM_END 2554 2555 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2556 JVMWrapper("JVM_GetMethodIxIxUTF"); 2557 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2558 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2559 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2560 return method->name()->as_utf8(); 2561 JVM_END 2562 2563 2564 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2565 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2566 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2567 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2568 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2569 return method->signature()->as_utf8(); 2570 JVM_END 2571 2572 /** 2573 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2574 * read entries in the constant pool. Since the old verifier always 2575 * works on a copy of the code, it will not see any rewriting that 2576 * may possibly occur in the middle of verification. So it is important 2577 * that nothing it calls tries to use the cpCache instead of the raw 2578 * constant pool, so we must use cp->uncached_x methods when appropriate. 2579 */ 2580 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2581 JVMWrapper("JVM_GetCPFieldNameUTF"); 2582 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2583 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2584 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2585 switch (cp->tag_at(cp_index).value()) { 2586 case JVM_CONSTANT_Fieldref: 2587 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2588 default: 2589 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2590 } 2591 ShouldNotReachHere(); 2592 return NULL; 2593 JVM_END 2594 2595 2596 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2597 JVMWrapper("JVM_GetCPMethodNameUTF"); 2598 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2599 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2600 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2601 switch (cp->tag_at(cp_index).value()) { 2602 case JVM_CONSTANT_InterfaceMethodref: 2603 case JVM_CONSTANT_Methodref: 2604 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2605 default: 2606 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2607 } 2608 ShouldNotReachHere(); 2609 return NULL; 2610 JVM_END 2611 2612 2613 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2614 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2615 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2616 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2617 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2618 switch (cp->tag_at(cp_index).value()) { 2619 case JVM_CONSTANT_InterfaceMethodref: 2620 case JVM_CONSTANT_Methodref: 2621 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2622 default: 2623 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2624 } 2625 ShouldNotReachHere(); 2626 return NULL; 2627 JVM_END 2628 2629 2630 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2631 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2632 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2633 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2634 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2635 switch (cp->tag_at(cp_index).value()) { 2636 case JVM_CONSTANT_Fieldref: 2637 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2638 default: 2639 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2640 } 2641 ShouldNotReachHere(); 2642 return NULL; 2643 JVM_END 2644 2645 2646 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2647 JVMWrapper("JVM_GetCPClassNameUTF"); 2648 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2649 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2650 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2651 Symbol* classname = cp->klass_name_at(cp_index); 2652 return classname->as_utf8(); 2653 JVM_END 2654 2655 2656 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2657 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2658 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2659 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2660 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2661 switch (cp->tag_at(cp_index).value()) { 2662 case JVM_CONSTANT_Fieldref: { 2663 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2664 Symbol* classname = cp->klass_name_at(class_index); 2665 return classname->as_utf8(); 2666 } 2667 default: 2668 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2669 } 2670 ShouldNotReachHere(); 2671 return NULL; 2672 JVM_END 2673 2674 2675 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2676 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2677 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2678 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2679 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2680 switch (cp->tag_at(cp_index).value()) { 2681 case JVM_CONSTANT_Methodref: 2682 case JVM_CONSTANT_InterfaceMethodref: { 2683 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2684 Symbol* classname = cp->klass_name_at(class_index); 2685 return classname->as_utf8(); 2686 } 2687 default: 2688 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2689 } 2690 ShouldNotReachHere(); 2691 return NULL; 2692 JVM_END 2693 2694 2695 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2696 JVMWrapper("JVM_GetCPFieldModifiers"); 2697 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2698 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2699 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2700 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2701 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2702 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2703 switch (cp->tag_at(cp_index).value()) { 2704 case JVM_CONSTANT_Fieldref: { 2705 Symbol* name = cp->uncached_name_ref_at(cp_index); 2706 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2707 InstanceKlass* ik = InstanceKlass::cast(k_called); 2708 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2709 if (fs.name() == name && fs.signature() == signature) { 2710 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2711 } 2712 } 2713 return -1; 2714 } 2715 default: 2716 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2717 } 2718 ShouldNotReachHere(); 2719 return 0; 2720 JVM_END 2721 2722 2723 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2724 JVMWrapper("JVM_GetCPMethodModifiers"); 2725 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2726 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2727 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2728 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2729 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2730 switch (cp->tag_at(cp_index).value()) { 2731 case JVM_CONSTANT_Methodref: 2732 case JVM_CONSTANT_InterfaceMethodref: { 2733 Symbol* name = cp->uncached_name_ref_at(cp_index); 2734 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2735 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2736 int methods_count = methods->length(); 2737 for (int i = 0; i < methods_count; i++) { 2738 Method* method = methods->at(i); 2739 if (method->name() == name && method->signature() == signature) { 2740 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2741 } 2742 } 2743 return -1; 2744 } 2745 default: 2746 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2747 } 2748 ShouldNotReachHere(); 2749 return 0; 2750 JVM_END 2751 2752 2753 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2754 2755 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2756 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2757 JVM_END 2758 2759 2760 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2761 JVMWrapper("JVM_IsSameClassPackage"); 2762 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2763 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2764 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2765 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2766 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2767 JVM_END 2768 2769 // Printing support ////////////////////////////////////////////////// 2770 extern "C" { 2771 2772 ATTRIBUTE_PRINTF(3, 0) 2773 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2774 // Reject count values that are negative signed values converted to 2775 // unsigned; see bug 4399518, 4417214 2776 if ((intptr_t)count <= 0) return -1; 2777 2778 int result = os::vsnprintf(str, count, fmt, args); 2779 if (result > 0 && (size_t)result >= count) { 2780 result = -1; 2781 } 2782 2783 return result; 2784 } 2785 2786 ATTRIBUTE_PRINTF(3, 4) 2787 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2788 va_list args; 2789 int len; 2790 va_start(args, fmt); 2791 len = jio_vsnprintf(str, count, fmt, args); 2792 va_end(args); 2793 return len; 2794 } 2795 2796 ATTRIBUTE_PRINTF(2, 3) 2797 int jio_fprintf(FILE* f, const char *fmt, ...) { 2798 int len; 2799 va_list args; 2800 va_start(args, fmt); 2801 len = jio_vfprintf(f, fmt, args); 2802 va_end(args); 2803 return len; 2804 } 2805 2806 ATTRIBUTE_PRINTF(2, 0) 2807 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2808 if (Arguments::vfprintf_hook() != NULL) { 2809 return Arguments::vfprintf_hook()(f, fmt, args); 2810 } else { 2811 return vfprintf(f, fmt, args); 2812 } 2813 } 2814 2815 ATTRIBUTE_PRINTF(1, 2) 2816 JNIEXPORT int jio_printf(const char *fmt, ...) { 2817 int len; 2818 va_list args; 2819 va_start(args, fmt); 2820 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2821 va_end(args); 2822 return len; 2823 } 2824 2825 // HotSpot specific jio method 2826 void jio_print(const char* s, size_t len) { 2827 // Try to make this function as atomic as possible. 2828 if (Arguments::vfprintf_hook() != NULL) { 2829 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2830 } else { 2831 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2832 size_t count = ::write(defaultStream::output_fd(), s, (int)len); 2833 } 2834 } 2835 2836 } // Extern C 2837 2838 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2839 2840 // In most of the JVM thread support functions we need to access the 2841 // thread through a ThreadsListHandle to prevent it from exiting and 2842 // being reclaimed while we try to operate on it. The exceptions to this 2843 // rule are when operating on the current thread, or if the monitor of 2844 // the target java.lang.Thread is locked at the Java level - in both 2845 // cases the target cannot exit. 2846 2847 static void thread_entry(JavaThread* thread, TRAPS) { 2848 HandleMark hm(THREAD); 2849 Handle obj(THREAD, thread->threadObj()); 2850 JavaValue result(T_VOID); 2851 JavaCalls::call_virtual(&result, 2852 obj, 2853 SystemDictionary::Thread_klass(), 2854 vmSymbols::run_method_name(), 2855 vmSymbols::void_method_signature(), 2856 THREAD); 2857 } 2858 2859 2860 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2861 JVMWrapper("JVM_StartThread"); 2862 JavaThread *native_thread = NULL; 2863 2864 // We cannot hold the Threads_lock when we throw an exception, 2865 // due to rank ordering issues. Example: we might need to grab the 2866 // Heap_lock while we construct the exception. 2867 bool throw_illegal_thread_state = false; 2868 2869 // We must release the Threads_lock before we can post a jvmti event 2870 // in Thread::start. 2871 { 2872 // Ensure that the C++ Thread and OSThread structures aren't freed before 2873 // we operate. 2874 MutexLocker mu(Threads_lock); 2875 2876 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2877 // re-starting an already started thread, so we should usually find 2878 // that the JavaThread is null. However for a JNI attached thread 2879 // there is a small window between the Thread object being created 2880 // (with its JavaThread set) and the update to its threadStatus, so we 2881 // have to check for this 2882 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2883 throw_illegal_thread_state = true; 2884 } else { 2885 // We could also check the stillborn flag to see if this thread was already stopped, but 2886 // for historical reasons we let the thread detect that itself when it starts running 2887 2888 jlong size = 2889 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2890 // Allocate the C++ Thread structure and create the native thread. The 2891 // stack size retrieved from java is 64-bit signed, but the constructor takes 2892 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2893 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2894 // - Avoid passing negative values which would result in really large stacks. 2895 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2896 size_t sz = size > 0 ? (size_t) size : 0; 2897 native_thread = new JavaThread(&thread_entry, sz); 2898 2899 // At this point it may be possible that no osthread was created for the 2900 // JavaThread due to lack of memory. Check for this situation and throw 2901 // an exception if necessary. Eventually we may want to change this so 2902 // that we only grab the lock if the thread was created successfully - 2903 // then we can also do this check and throw the exception in the 2904 // JavaThread constructor. 2905 if (native_thread->osthread() != NULL) { 2906 // Note: the current thread is not being used within "prepare". 2907 native_thread->prepare(jthread); 2908 } 2909 } 2910 } 2911 2912 if (throw_illegal_thread_state) { 2913 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2914 } 2915 2916 assert(native_thread != NULL, "Starting null thread?"); 2917 2918 if (native_thread->osthread() == NULL) { 2919 // No one should hold a reference to the 'native_thread'. 2920 native_thread->smr_delete(); 2921 if (JvmtiExport::should_post_resource_exhausted()) { 2922 JvmtiExport::post_resource_exhausted( 2923 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2924 os::native_thread_creation_failed_msg()); 2925 } 2926 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2927 os::native_thread_creation_failed_msg()); 2928 } 2929 2930 Thread::start(native_thread); 2931 2932 JVM_END 2933 2934 2935 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2936 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2937 // but is thought to be reliable and simple. In the case, where the receiver is the 2938 // same thread as the sender, no VM_Operation is needed. 2939 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2940 JVMWrapper("JVM_StopThread"); 2941 2942 // A nested ThreadsListHandle will grab the Threads_lock so create 2943 // tlh before we resolve throwable. 2944 ThreadsListHandle tlh(thread); 2945 oop java_throwable = JNIHandles::resolve(throwable); 2946 if (java_throwable == NULL) { 2947 THROW(vmSymbols::java_lang_NullPointerException()); 2948 } 2949 oop java_thread = NULL; 2950 JavaThread* receiver = NULL; 2951 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2952 Events::log_exception(thread, 2953 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2954 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2955 2956 if (is_alive) { 2957 // jthread refers to a live JavaThread. 2958 if (thread == receiver) { 2959 // Exception is getting thrown at self so no VM_Operation needed. 2960 THROW_OOP(java_throwable); 2961 } else { 2962 // Use a VM_Operation to throw the exception. 2963 Thread::send_async_exception(java_thread, java_throwable); 2964 } 2965 } else { 2966 // Either: 2967 // - target thread has not been started before being stopped, or 2968 // - target thread already terminated 2969 // We could read the threadStatus to determine which case it is 2970 // but that is overkill as it doesn't matter. We must set the 2971 // stillborn flag for the first case, and if the thread has already 2972 // exited setting this flag has no effect. 2973 java_lang_Thread::set_stillborn(java_thread); 2974 } 2975 JVM_END 2976 2977 2978 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2979 JVMWrapper("JVM_IsThreadAlive"); 2980 2981 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2982 return java_lang_Thread::is_alive(thread_oop); 2983 JVM_END 2984 2985 2986 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2987 JVMWrapper("JVM_SuspendThread"); 2988 2989 ThreadsListHandle tlh(thread); 2990 JavaThread* receiver = NULL; 2991 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2992 if (is_alive) { 2993 // jthread refers to a live JavaThread. 2994 { 2995 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2996 if (receiver->is_external_suspend()) { 2997 // Don't allow nested external suspend requests. We can't return 2998 // an error from this interface so just ignore the problem. 2999 return; 3000 } 3001 if (receiver->is_exiting()) { // thread is in the process of exiting 3002 return; 3003 } 3004 receiver->set_external_suspend(); 3005 } 3006 3007 // java_suspend() will catch threads in the process of exiting 3008 // and will ignore them. 3009 receiver->java_suspend(); 3010 3011 // It would be nice to have the following assertion in all the 3012 // time, but it is possible for a racing resume request to have 3013 // resumed this thread right after we suspended it. Temporarily 3014 // enable this assertion if you are chasing a different kind of 3015 // bug. 3016 // 3017 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 3018 // receiver->is_being_ext_suspended(), "thread is not suspended"); 3019 } 3020 JVM_END 3021 3022 3023 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 3024 JVMWrapper("JVM_ResumeThread"); 3025 3026 ThreadsListHandle tlh(thread); 3027 JavaThread* receiver = NULL; 3028 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3029 if (is_alive) { 3030 // jthread refers to a live JavaThread. 3031 3032 // This is the original comment for this Threads_lock grab: 3033 // We need to *always* get the threads lock here, since this operation cannot be allowed during 3034 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 3035 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 3036 // looks at it. 3037 // 3038 // The above comment dates back to when we had both internal and 3039 // external suspend APIs that shared a common underlying mechanism. 3040 // External suspend is now entirely cooperative and doesn't share 3041 // anything with internal suspend. That said, there are some 3042 // assumptions in the VM that an external resume grabs the 3043 // Threads_lock. We can't drop the Threads_lock grab here until we 3044 // resolve the assumptions that exist elsewhere. 3045 // 3046 MutexLocker ml(Threads_lock); 3047 receiver->java_resume(); 3048 } 3049 JVM_END 3050 3051 3052 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3053 JVMWrapper("JVM_SetThreadPriority"); 3054 3055 ThreadsListHandle tlh(thread); 3056 oop java_thread = NULL; 3057 JavaThread* receiver = NULL; 3058 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3059 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3060 3061 if (is_alive) { 3062 // jthread refers to a live JavaThread. 3063 Thread::set_priority(receiver, (ThreadPriority)prio); 3064 } 3065 // Implied else: If the JavaThread hasn't started yet, then the 3066 // priority set in the java.lang.Thread object above will be pushed 3067 // down when it does start. 3068 JVM_END 3069 3070 3071 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3072 JVMWrapper("JVM_Yield"); 3073 if (os::dont_yield()) return; 3074 HOTSPOT_THREAD_YIELD(); 3075 os::naked_yield(); 3076 JVM_END 3077 3078 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) { 3079 assert(event != NULL, "invariant"); 3080 assert(event->should_commit(), "invariant"); 3081 event->set_time(millis); 3082 event->commit(); 3083 } 3084 3085 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3086 JVMWrapper("JVM_Sleep"); 3087 3088 if (millis < 0) { 3089 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3090 } 3091 3092 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 3093 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3094 } 3095 3096 // Save current thread state and restore it at the end of this block. 3097 // And set new thread state to SLEEPING. 3098 JavaThreadSleepState jtss(thread); 3099 3100 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3101 EventThreadSleep event; 3102 3103 if (millis == 0) { 3104 os::naked_yield(); 3105 } else { 3106 ThreadState old_state = thread->osthread()->get_state(); 3107 thread->osthread()->set_state(SLEEPING); 3108 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3109 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3110 // us while we were sleeping. We do not overwrite those. 3111 if (!HAS_PENDING_EXCEPTION) { 3112 if (event.should_commit()) { 3113 post_thread_sleep_event(&event, millis); 3114 } 3115 HOTSPOT_THREAD_SLEEP_END(1); 3116 3117 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3118 // to properly restore the thread state. That's likely wrong. 3119 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3120 } 3121 } 3122 thread->osthread()->set_state(old_state); 3123 } 3124 if (event.should_commit()) { 3125 post_thread_sleep_event(&event, millis); 3126 } 3127 HOTSPOT_THREAD_SLEEP_END(0); 3128 JVM_END 3129 3130 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3131 JVMWrapper("JVM_CurrentThread"); 3132 oop jthread = thread->threadObj(); 3133 assert (thread != NULL, "no current thread!"); 3134 return JNIHandles::make_local(env, jthread); 3135 JVM_END 3136 3137 3138 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3139 JVMWrapper("JVM_CountStackFrames"); 3140 3141 uint32_t debug_bits = 0; 3142 ThreadsListHandle tlh(thread); 3143 JavaThread* receiver = NULL; 3144 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3145 int count = 0; 3146 if (is_alive) { 3147 // jthread refers to a live JavaThread. 3148 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) { 3149 // Count all java activation, i.e., number of vframes. 3150 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) { 3151 // Native frames are not counted. 3152 if (!vfst.method()->is_native()) count++; 3153 } 3154 } else { 3155 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3156 "this thread is not suspended"); 3157 } 3158 } 3159 // Implied else: if JavaThread is not alive simply return a count of 0. 3160 3161 return count; 3162 JVM_END 3163 3164 3165 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3166 JVMWrapper("JVM_Interrupt"); 3167 3168 ThreadsListHandle tlh(thread); 3169 JavaThread* receiver = NULL; 3170 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3171 if (is_alive) { 3172 // jthread refers to a live JavaThread. 3173 Thread::interrupt(receiver); 3174 } 3175 JVM_END 3176 3177 3178 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3179 JVMWrapper("JVM_IsInterrupted"); 3180 3181 ThreadsListHandle tlh(thread); 3182 JavaThread* receiver = NULL; 3183 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3184 if (is_alive) { 3185 // jthread refers to a live JavaThread. 3186 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0); 3187 } else { 3188 return JNI_FALSE; 3189 } 3190 JVM_END 3191 3192 3193 // Return true iff the current thread has locked the object passed in 3194 3195 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3196 JVMWrapper("JVM_HoldsLock"); 3197 assert(THREAD->is_Java_thread(), "sanity check"); 3198 if (obj == NULL) { 3199 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3200 } 3201 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3202 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3203 JVM_END 3204 3205 3206 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3207 JVMWrapper("JVM_DumpAllStacks"); 3208 VM_PrintThreads op; 3209 VMThread::execute(&op); 3210 if (JvmtiExport::should_post_data_dump()) { 3211 JvmtiExport::post_data_dump(); 3212 } 3213 JVM_END 3214 3215 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3216 JVMWrapper("JVM_SetNativeThreadName"); 3217 3218 // We don't use a ThreadsListHandle here because the current thread 3219 // must be alive. 3220 oop java_thread = JNIHandles::resolve_non_null(jthread); 3221 JavaThread* thr = java_lang_Thread::thread(java_thread); 3222 if (thread == thr && !thr->has_attached_via_jni()) { 3223 // Thread naming is only supported for the current thread and 3224 // we don't set the name of an attached thread to avoid stepping 3225 // on other programs. 3226 ResourceMark rm(thread); 3227 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3228 os::set_native_thread_name(thread_name); 3229 } 3230 JVM_END 3231 3232 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3233 3234 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3235 JVMWrapper("JVM_GetClassContext"); 3236 ResourceMark rm(THREAD); 3237 JvmtiVMObjectAllocEventCollector oam; 3238 vframeStream vfst(thread); 3239 3240 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3241 // This must only be called from SecurityManager.getClassContext 3242 Method* m = vfst.method(); 3243 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3244 m->name() == vmSymbols::getClassContext_name() && 3245 m->signature() == vmSymbols::void_class_array_signature())) { 3246 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3247 } 3248 } 3249 3250 // Collect method holders 3251 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3252 for (; !vfst.at_end(); vfst.security_next()) { 3253 Method* m = vfst.method(); 3254 // Native frames are not returned 3255 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3256 Klass* holder = m->method_holder(); 3257 assert(holder->is_klass(), "just checking"); 3258 klass_array->append(holder); 3259 } 3260 } 3261 3262 // Create result array of type [Ljava/lang/Class; 3263 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3264 // Fill in mirrors corresponding to method holders 3265 for (int i = 0; i < klass_array->length(); i++) { 3266 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3267 } 3268 3269 return (jobjectArray) JNIHandles::make_local(env, result); 3270 JVM_END 3271 3272 3273 // java.lang.Package //////////////////////////////////////////////////////////////// 3274 3275 3276 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3277 JVMWrapper("JVM_GetSystemPackage"); 3278 ResourceMark rm(THREAD); 3279 JvmtiVMObjectAllocEventCollector oam; 3280 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3281 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3282 return (jstring) JNIHandles::make_local(result); 3283 JVM_END 3284 3285 3286 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3287 JVMWrapper("JVM_GetSystemPackages"); 3288 JvmtiVMObjectAllocEventCollector oam; 3289 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3290 return (jobjectArray) JNIHandles::make_local(result); 3291 JVM_END 3292 3293 3294 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3295 3296 3297 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3298 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3299 3300 MonitorLockerEx ml(Heap_lock); 3301 oop ref = Universe::reference_pending_list(); 3302 if (ref != NULL) { 3303 Universe::set_reference_pending_list(NULL); 3304 } 3305 return JNIHandles::make_local(env, ref); 3306 JVM_END 3307 3308 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3309 JVMWrapper("JVM_HasReferencePendingList"); 3310 MonitorLockerEx ml(Heap_lock); 3311 return Universe::has_reference_pending_list(); 3312 JVM_END 3313 3314 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3315 JVMWrapper("JVM_WaitForReferencePendingList"); 3316 MonitorLockerEx ml(Heap_lock); 3317 while (!Universe::has_reference_pending_list()) { 3318 ml.wait(); 3319 } 3320 JVM_END 3321 3322 3323 // ObjectInputStream /////////////////////////////////////////////////////////////// 3324 3325 // Return the first user-defined class loader up the execution stack, or null 3326 // if only code from the bootstrap or platform class loader is on the stack. 3327 3328 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3329 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3330 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3331 oop loader = vfst.method()->method_holder()->class_loader(); 3332 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3333 return JNIHandles::make_local(env, loader); 3334 } 3335 } 3336 return NULL; 3337 JVM_END 3338 3339 3340 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3341 3342 3343 // resolve array handle and check arguments 3344 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3345 if (arr == NULL) { 3346 THROW_0(vmSymbols::java_lang_NullPointerException()); 3347 } 3348 oop a = JNIHandles::resolve_non_null(arr); 3349 if (!a->is_array()) { 3350 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3351 } else if (type_array_only && !a->is_typeArray()) { 3352 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3353 } 3354 return arrayOop(a); 3355 } 3356 3357 3358 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3359 JVMWrapper("JVM_GetArrayLength"); 3360 arrayOop a = check_array(env, arr, false, CHECK_0); 3361 return a->length(); 3362 JVM_END 3363 3364 3365 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3366 JVMWrapper("JVM_Array_Get"); 3367 JvmtiVMObjectAllocEventCollector oam; 3368 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3369 jvalue value; 3370 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3371 oop box = Reflection::box(&value, type, CHECK_NULL); 3372 return JNIHandles::make_local(env, box); 3373 JVM_END 3374 3375 3376 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3377 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3378 jvalue value; 3379 value.i = 0; // to initialize value before getting used in CHECK 3380 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3381 assert(a->is_typeArray(), "just checking"); 3382 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3383 BasicType wide_type = (BasicType) wCode; 3384 if (type != wide_type) { 3385 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3386 } 3387 return value; 3388 JVM_END 3389 3390 3391 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3392 JVMWrapper("JVM_SetArrayElement"); 3393 arrayOop a = check_array(env, arr, false, CHECK); 3394 oop box = JNIHandles::resolve(val); 3395 jvalue value; 3396 value.i = 0; // to initialize value before getting used in CHECK 3397 BasicType value_type; 3398 if (a->is_objArray()) { 3399 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3400 value_type = Reflection::unbox_for_regular_object(box, &value); 3401 } else { 3402 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3403 } 3404 Reflection::array_set(&value, a, index, value_type, CHECK); 3405 JVM_END 3406 3407 3408 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3409 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3410 arrayOop a = check_array(env, arr, true, CHECK); 3411 assert(a->is_typeArray(), "just checking"); 3412 BasicType value_type = (BasicType) vCode; 3413 Reflection::array_set(&v, a, index, value_type, CHECK); 3414 JVM_END 3415 3416 3417 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3418 JVMWrapper("JVM_NewArray"); 3419 JvmtiVMObjectAllocEventCollector oam; 3420 oop element_mirror = JNIHandles::resolve(eltClass); 3421 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3422 return JNIHandles::make_local(env, result); 3423 JVM_END 3424 3425 3426 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3427 JVMWrapper("JVM_NewMultiArray"); 3428 JvmtiVMObjectAllocEventCollector oam; 3429 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3430 oop element_mirror = JNIHandles::resolve(eltClass); 3431 assert(dim_array->is_typeArray(), "just checking"); 3432 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3433 return JNIHandles::make_local(env, result); 3434 JVM_END 3435 3436 3437 // Library support /////////////////////////////////////////////////////////////////////////// 3438 3439 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3440 //%note jvm_ct 3441 JVMWrapper("JVM_LoadLibrary"); 3442 char ebuf[1024]; 3443 void *load_result; 3444 { 3445 ThreadToNativeFromVM ttnfvm(thread); 3446 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3447 } 3448 if (load_result == NULL) { 3449 char msg[1024]; 3450 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3451 // Since 'ebuf' may contain a string encoded using 3452 // platform encoding scheme, we need to pass 3453 // Exceptions::unsafe_to_utf8 to the new_exception method 3454 // as the last argument. See bug 6367357. 3455 Handle h_exception = 3456 Exceptions::new_exception(thread, 3457 vmSymbols::java_lang_UnsatisfiedLinkError(), 3458 msg, Exceptions::unsafe_to_utf8); 3459 3460 THROW_HANDLE_0(h_exception); 3461 } 3462 return load_result; 3463 JVM_END 3464 3465 3466 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3467 JVMWrapper("JVM_UnloadLibrary"); 3468 os::dll_unload(handle); 3469 JVM_END 3470 3471 3472 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3473 JVMWrapper("JVM_FindLibraryEntry"); 3474 return os::dll_lookup(handle, name); 3475 JVM_END 3476 3477 3478 // JNI version /////////////////////////////////////////////////////////////////////////////// 3479 3480 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3481 JVMWrapper("JVM_IsSupportedJNIVersion"); 3482 return Threads::is_supported_jni_version_including_1_1(version); 3483 JVM_END 3484 3485 3486 // String support /////////////////////////////////////////////////////////////////////////// 3487 3488 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3489 JVMWrapper("JVM_InternString"); 3490 JvmtiVMObjectAllocEventCollector oam; 3491 if (str == NULL) return NULL; 3492 oop string = JNIHandles::resolve_non_null(str); 3493 oop result = StringTable::intern(string, CHECK_NULL); 3494 return (jstring) JNIHandles::make_local(env, result); 3495 JVM_END 3496 3497 3498 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3499 3500 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3501 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3502 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3503 // that only works with java threads. 3504 3505 3506 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3507 VM_Exit::block_if_vm_exited(); 3508 JVMWrapper("JVM_RawMonitorCreate"); 3509 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3510 } 3511 3512 3513 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3514 VM_Exit::block_if_vm_exited(); 3515 JVMWrapper("JVM_RawMonitorDestroy"); 3516 delete ((Mutex*) mon); 3517 } 3518 3519 3520 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3521 VM_Exit::block_if_vm_exited(); 3522 JVMWrapper("JVM_RawMonitorEnter"); 3523 ((Mutex*) mon)->jvm_raw_lock(); 3524 return 0; 3525 } 3526 3527 3528 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3529 VM_Exit::block_if_vm_exited(); 3530 JVMWrapper("JVM_RawMonitorExit"); 3531 ((Mutex*) mon)->jvm_raw_unlock(); 3532 } 3533 3534 3535 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3536 3537 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3538 Handle loader, Handle protection_domain, 3539 jboolean throwError, TRAPS) { 3540 // Security Note: 3541 // The Java level wrapper will perform the necessary security check allowing 3542 // us to pass the NULL as the initiating class loader. The VM is responsible for 3543 // the checkPackageAccess relative to the initiating class loader via the 3544 // protection_domain. The protection_domain is passed as NULL by the java code 3545 // if there is no security manager in 3-arg Class.forName(). 3546 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3547 3548 // Check if we should initialize the class 3549 if (init && klass->is_instance_klass()) { 3550 klass->initialize(CHECK_NULL); 3551 } 3552 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3553 } 3554 3555 3556 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3557 3558 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3559 JVMWrapper("JVM_InvokeMethod"); 3560 Handle method_handle; 3561 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3562 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3563 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3564 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3565 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3566 jobject res = JNIHandles::make_local(env, result); 3567 if (JvmtiExport::should_post_vm_object_alloc()) { 3568 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3569 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3570 if (java_lang_Class::is_primitive(ret_type)) { 3571 // Only for primitive type vm allocates memory for java object. 3572 // See box() method. 3573 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3574 } 3575 } 3576 return res; 3577 } else { 3578 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3579 } 3580 JVM_END 3581 3582 3583 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3584 JVMWrapper("JVM_NewInstanceFromConstructor"); 3585 oop constructor_mirror = JNIHandles::resolve(c); 3586 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3587 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3588 jobject res = JNIHandles::make_local(env, result); 3589 if (JvmtiExport::should_post_vm_object_alloc()) { 3590 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3591 } 3592 return res; 3593 JVM_END 3594 3595 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3596 3597 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3598 JVMWrapper("JVM_SupportsCX8"); 3599 return VM_Version::supports_cx8(); 3600 JVM_END 3601 3602 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3603 JVMWrapper("JVM_InitializeFromArchive"); 3604 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3605 assert(k->is_klass(), "just checking"); 3606 HeapShared::initialize_from_archived_subgraph(k); 3607 JVM_END 3608 3609 // Returns an array of all live Thread objects (VM internal JavaThreads, 3610 // jvmti agent threads, and JNI attaching threads are skipped) 3611 // See CR 6404306 regarding JNI attaching threads 3612 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3613 ResourceMark rm(THREAD); 3614 ThreadsListEnumerator tle(THREAD, false, false); 3615 JvmtiVMObjectAllocEventCollector oam; 3616 3617 int num_threads = tle.num_threads(); 3618 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3619 objArrayHandle threads_ah(THREAD, r); 3620 3621 for (int i = 0; i < num_threads; i++) { 3622 Handle h = tle.get_threadObj(i); 3623 threads_ah->obj_at_put(i, h()); 3624 } 3625 3626 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3627 JVM_END 3628 3629 3630 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3631 // Return StackTraceElement[][], each element is the stack trace of a thread in 3632 // the corresponding entry in the given threads array 3633 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3634 JVMWrapper("JVM_DumpThreads"); 3635 JvmtiVMObjectAllocEventCollector oam; 3636 3637 // Check if threads is null 3638 if (threads == NULL) { 3639 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3640 } 3641 3642 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3643 objArrayHandle ah(THREAD, a); 3644 int num_threads = ah->length(); 3645 // check if threads is non-empty array 3646 if (num_threads == 0) { 3647 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3648 } 3649 3650 // check if threads is not an array of objects of Thread class 3651 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3652 if (k != SystemDictionary::Thread_klass()) { 3653 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3654 } 3655 3656 ResourceMark rm(THREAD); 3657 3658 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3659 for (int i = 0; i < num_threads; i++) { 3660 oop thread_obj = ah->obj_at(i); 3661 instanceHandle h(THREAD, (instanceOop) thread_obj); 3662 thread_handle_array->append(h); 3663 } 3664 3665 // The JavaThread references in thread_handle_array are validated 3666 // in VM_ThreadDump::doit(). 3667 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3668 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3669 3670 JVM_END 3671 3672 // JVM monitoring and management support 3673 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3674 return Management::get_jmm_interface(version); 3675 JVM_END 3676 3677 // com.sun.tools.attach.VirtualMachine agent properties support 3678 // 3679 // Initialize the agent properties with the properties maintained in the VM 3680 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3681 JVMWrapper("JVM_InitAgentProperties"); 3682 ResourceMark rm; 3683 3684 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3685 3686 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3687 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3688 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3689 return properties; 3690 JVM_END 3691 3692 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3693 { 3694 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3695 JvmtiVMObjectAllocEventCollector oam; 3696 3697 if (ofClass == NULL) { 3698 return NULL; 3699 } 3700 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3701 // Special handling for primitive objects 3702 if (java_lang_Class::is_primitive(mirror())) { 3703 return NULL; 3704 } 3705 Klass* k = java_lang_Class::as_Klass(mirror()); 3706 if (!k->is_instance_klass()) { 3707 return NULL; 3708 } 3709 InstanceKlass* ik = InstanceKlass::cast(k); 3710 int encl_method_class_idx = ik->enclosing_method_class_index(); 3711 if (encl_method_class_idx == 0) { 3712 return NULL; 3713 } 3714 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3715 objArrayHandle dest(THREAD, dest_o); 3716 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3717 dest->obj_at_put(0, enc_k->java_mirror()); 3718 int encl_method_method_idx = ik->enclosing_method_method_index(); 3719 if (encl_method_method_idx != 0) { 3720 Symbol* sym = ik->constants()->symbol_at( 3721 extract_low_short_from_int( 3722 ik->constants()->name_and_type_at(encl_method_method_idx))); 3723 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3724 dest->obj_at_put(1, str()); 3725 sym = ik->constants()->symbol_at( 3726 extract_high_short_from_int( 3727 ik->constants()->name_and_type_at(encl_method_method_idx))); 3728 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3729 dest->obj_at_put(2, str()); 3730 } 3731 return (jobjectArray) JNIHandles::make_local(dest()); 3732 } 3733 JVM_END 3734 3735 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3736 { 3737 memset(info, 0, info_size); 3738 3739 info->jvm_version = VM_Version::jvm_version(); 3740 info->patch_version = VM_Version::vm_patch_version(); 3741 3742 // when we add a new capability in the jvm_version_info struct, we should also 3743 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3744 // counter defined in runtimeService.cpp. 3745 info->is_attach_supported = AttachListener::is_attach_supported(); 3746 } 3747 JVM_END 3748 3749 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3750 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3751 ResourceMark rm(THREAD); 3752 3753 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3754 return NULL; 3755 } 3756 3757 char** vm_flags = Arguments::jvm_flags_array(); 3758 char** vm_args = Arguments::jvm_args_array(); 3759 int num_flags = Arguments::num_jvm_flags(); 3760 int num_args = Arguments::num_jvm_args(); 3761 3762 InstanceKlass* ik = SystemDictionary::String_klass(); 3763 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3764 objArrayHandle result_h(THREAD, r); 3765 3766 int index = 0; 3767 for (int j = 0; j < num_flags; j++, index++) { 3768 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3769 result_h->obj_at_put(index, h()); 3770 } 3771 for (int i = 0; i < num_args; i++, index++) { 3772 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3773 result_h->obj_at_put(index, h()); 3774 } 3775 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3776 JVM_END 3777 3778 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3779 return os::get_signal_number(name); 3780 JVM_END