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 "memory/oopFactory.hpp" 42 #include "memory/referenceType.hpp" 43 #include "memory/resourceArea.hpp" 44 #include "memory/universe.hpp" 45 #include "oops/access.inline.hpp" 46 #include "oops/fieldStreams.hpp" 47 #include "oops/instanceKlass.hpp" 48 #include "oops/method.hpp" 49 #include "oops/objArrayKlass.hpp" 50 #include "oops/objArrayOop.inline.hpp" 51 #include "oops/oop.inline.hpp" 52 #include "prims/jvm_misc.hpp" 53 #include "prims/jvmtiExport.hpp" 54 #include "prims/jvmtiThreadState.hpp" 55 #include "prims/nativeLookup.hpp" 56 #include "prims/privilegedStack.hpp" 57 #include "prims/stackwalk.hpp" 58 #include "runtime/arguments.hpp" 59 #include "runtime/atomic.hpp" 60 #include "runtime/handles.inline.hpp" 61 #include "runtime/init.hpp" 62 #include "runtime/interfaceSupport.inline.hpp" 63 #include "runtime/java.hpp" 64 #include "runtime/javaCalls.hpp" 65 #include "runtime/jfieldIDWorkaround.hpp" 66 #include "runtime/jniHandles.inline.hpp" 67 #include "runtime/orderAccess.hpp" 68 #include "runtime/os.inline.hpp" 69 #include "runtime/perfData.hpp" 70 #include "runtime/reflection.hpp" 71 #include "runtime/thread.inline.hpp" 72 #include "runtime/threadSMR.hpp" 73 #include "runtime/vframe.inline.hpp" 74 #include "runtime/vm_operations.hpp" 75 #include "runtime/vm_version.hpp" 76 #include "services/attachListener.hpp" 77 #include "services/management.hpp" 78 #include "services/threadService.hpp" 79 #include "utilities/copy.hpp" 80 #include "utilities/defaultStream.hpp" 81 #include "utilities/dtrace.hpp" 82 #include "utilities/events.hpp" 83 #include "utilities/histogram.hpp" 84 #include "utilities/macros.hpp" 85 #include "utilities/utf8.hpp" 86 #if INCLUDE_CDS 87 #include "classfile/systemDictionaryShared.hpp" 88 #endif 89 90 #include <errno.h> 91 92 /* 93 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 94 such ctors and calls MUST NOT come between an oop declaration/init and its 95 usage because if objects are move this may cause various memory stomps, bus 96 errors and segfaults. Here is a cookbook for causing so called "naked oop 97 failures": 98 99 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 100 JVMWrapper("JVM_GetClassDeclaredFields"); 101 102 // Object address to be held directly in mirror & not visible to GC 103 oop mirror = JNIHandles::resolve_non_null(ofClass); 104 105 // If this ctor can hit a safepoint, moving objects around, then 106 ComplexConstructor foo; 107 108 // Boom! mirror may point to JUNK instead of the intended object 109 (some dereference of mirror) 110 111 // Here's another call that may block for GC, making mirror stale 112 MutexLocker ml(some_lock); 113 114 // And here's an initializer that can result in a stale oop 115 // all in one step. 116 oop o = call_that_can_throw_exception(TRAPS); 117 118 119 The solution is to keep the oop declaration BELOW the ctor or function 120 call that might cause a GC, do another resolve to reassign the oop, or 121 consider use of a Handle instead of an oop so there is immunity from object 122 motion. But note that the "QUICK" entries below do not have a handlemark 123 and thus can only support use of handles passed in. 124 */ 125 126 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 127 ResourceMark rm; 128 int line_number = -1; 129 const char * source_file = NULL; 130 const char * trace = "explicit"; 131 InstanceKlass* caller = NULL; 132 JavaThread* jthread = JavaThread::current(); 133 if (jthread->has_last_Java_frame()) { 134 vframeStream vfst(jthread); 135 136 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 137 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 138 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 139 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 140 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 141 142 Method* last_caller = NULL; 143 144 while (!vfst.at_end()) { 145 Method* m = vfst.method(); 146 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 147 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 148 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 149 break; 150 } 151 last_caller = m; 152 vfst.next(); 153 } 154 // if this is called from Class.forName0 and that is called from Class.forName, 155 // then print the caller of Class.forName. If this is Class.loadClass, then print 156 // that caller, otherwise keep quiet since this should be picked up elsewhere. 157 bool found_it = false; 158 if (!vfst.at_end() && 159 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 160 vfst.method()->name() == vmSymbols::forName0_name()) { 161 vfst.next(); 162 if (!vfst.at_end() && 163 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 164 vfst.method()->name() == vmSymbols::forName_name()) { 165 vfst.next(); 166 found_it = true; 167 } 168 } else if (last_caller != NULL && 169 last_caller->method_holder()->name() == 170 vmSymbols::java_lang_ClassLoader() && 171 last_caller->name() == vmSymbols::loadClass_name()) { 172 found_it = true; 173 } else if (!vfst.at_end()) { 174 if (vfst.method()->is_native()) { 175 // JNI call 176 found_it = true; 177 } 178 } 179 if (found_it && !vfst.at_end()) { 180 // found the caller 181 caller = vfst.method()->method_holder(); 182 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 183 if (line_number == -1) { 184 // show method name if it's a native method 185 trace = vfst.method()->name_and_sig_as_C_string(); 186 } 187 Symbol* s = caller->source_file_name(); 188 if (s != NULL) { 189 source_file = s->as_C_string(); 190 } 191 } 192 } 193 if (caller != NULL) { 194 if (to_class != caller) { 195 const char * from = caller->external_name(); 196 const char * to = to_class->external_name(); 197 // print in a single call to reduce interleaving between threads 198 if (source_file != NULL) { 199 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 200 } else { 201 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 202 } 203 } 204 } 205 } 206 207 void trace_class_resolution(Klass* to_class) { 208 EXCEPTION_MARK; 209 trace_class_resolution_impl(to_class, THREAD); 210 if (HAS_PENDING_EXCEPTION) { 211 CLEAR_PENDING_EXCEPTION; 212 } 213 } 214 215 // Wrapper to trace JVM functions 216 217 #ifdef ASSERT 218 Histogram* JVMHistogram; 219 volatile int JVMHistogram_lock = 0; 220 221 class JVMHistogramElement : public HistogramElement { 222 public: 223 JVMHistogramElement(const char* name); 224 }; 225 226 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 227 _name = elementName; 228 uintx count = 0; 229 230 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 231 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 232 count +=1; 233 if ( (WarnOnStalledSpinLock > 0) 234 && (count % WarnOnStalledSpinLock == 0)) { 235 warning("JVMHistogram_lock seems to be stalled"); 236 } 237 } 238 } 239 240 if(JVMHistogram == NULL) 241 JVMHistogram = new Histogram("JVM Call Counts",100); 242 243 JVMHistogram->add_element(this); 244 Atomic::dec(&JVMHistogram_lock); 245 } 246 247 #define JVMCountWrapper(arg) \ 248 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 249 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 250 251 #define JVMWrapper(arg) JVMCountWrapper(arg); 252 #else 253 #define JVMWrapper(arg) 254 #endif 255 256 257 // Interface version ///////////////////////////////////////////////////////////////////// 258 259 260 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 261 return JVM_INTERFACE_VERSION; 262 JVM_END 263 264 265 // java.lang.System ////////////////////////////////////////////////////////////////////// 266 267 268 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 269 JVMWrapper("JVM_CurrentTimeMillis"); 270 return os::javaTimeMillis(); 271 JVM_END 272 273 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 274 JVMWrapper("JVM_NanoTime"); 275 return os::javaTimeNanos(); 276 JVM_END 277 278 // The function below is actually exposed by jdk.internal.misc.VM and not 279 // java.lang.System, but we choose to keep it here so that it stays next 280 // to JVM_CurrentTimeMillis and JVM_NanoTime 281 282 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 283 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 284 285 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 286 JVMWrapper("JVM_GetNanoTimeAdjustment"); 287 jlong seconds; 288 jlong nanos; 289 290 os::javaTimeSystemUTC(seconds, nanos); 291 292 // We're going to verify that the result can fit in a long. 293 // For that we need the difference in seconds between 'seconds' 294 // and 'offset_secs' to be such that: 295 // |seconds - offset_secs| < (2^63/10^9) 296 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 297 // which makes |seconds - offset_secs| < 2^33 298 // and we will prefer +/- 2^32 as the maximum acceptable diff 299 // as 2^32 has a more natural feel than 2^33... 300 // 301 // So if |seconds - offset_secs| >= 2^32 - we return a special 302 // sentinel value (-1) which the caller should take as an 303 // exception value indicating that the offset given to us is 304 // too far from range of the current time - leading to too big 305 // a nano adjustment. The caller is expected to recover by 306 // computing a more accurate offset and calling this method 307 // again. (For the record 2^32 secs is ~136 years, so that 308 // should rarely happen) 309 // 310 jlong diff = seconds - offset_secs; 311 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 312 return -1; // sentinel value: the offset is too far off the target 313 } 314 315 // return the adjustment. If you compute a time by adding 316 // this number of nanoseconds along with the number of seconds 317 // in the offset you should get the current UTC time. 318 return (diff * (jlong)1000000000) + nanos; 319 JVM_END 320 321 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 322 jobject dst, jint dst_pos, jint length)) 323 JVMWrapper("JVM_ArrayCopy"); 324 // Check if we have null pointers 325 if (src == NULL || dst == NULL) { 326 THROW(vmSymbols::java_lang_NullPointerException()); 327 } 328 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 329 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 330 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 331 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 332 // Do copy 333 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 334 JVM_END 335 336 337 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 338 JavaValue r(T_OBJECT); 339 // public synchronized Object put(Object key, Object value); 340 HandleMark hm(THREAD); 341 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 342 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 343 JavaCalls::call_virtual(&r, 344 props, 345 SystemDictionary::Properties_klass(), 346 vmSymbols::put_name(), 347 vmSymbols::object_object_object_signature(), 348 key_str, 349 value_str, 350 THREAD); 351 } 352 353 354 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 355 356 357 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 358 JVMWrapper("JVM_InitProperties"); 359 ResourceMark rm; 360 361 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 362 363 // System property list includes both user set via -D option and 364 // jvm system specific properties. 365 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 366 PUTPROP(props, p->key(), p->value()); 367 } 368 369 // Convert the -XX:MaxDirectMemorySize= command line flag 370 // to the sun.nio.MaxDirectMemorySize property. 371 // Do this after setting user properties to prevent people 372 // from setting the value with a -D option, as requested. 373 { 374 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 375 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 376 } else { 377 char as_chars[256]; 378 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 379 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 380 } 381 } 382 383 // JVM monitoring and management support 384 // Add the sun.management.compiler property for the compiler's name 385 { 386 #undef CSIZE 387 #if defined(_LP64) || defined(_WIN64) 388 #define CSIZE "64-Bit " 389 #else 390 #define CSIZE 391 #endif // 64bit 392 393 #ifdef TIERED 394 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 395 #else 396 #if defined(COMPILER1) 397 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 398 #elif defined(COMPILER2) 399 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 400 #elif INCLUDE_JVMCI 401 #error "INCLUDE_JVMCI should imply TIERED" 402 #else 403 const char* compiler_name = ""; 404 #endif // compilers 405 #endif // TIERED 406 407 if (*compiler_name != '\0' && 408 (Arguments::mode() != Arguments::_int)) { 409 PUTPROP(props, "sun.management.compiler", compiler_name); 410 } 411 } 412 413 return properties; 414 JVM_END 415 416 417 /* 418 * Return the temporary directory that the VM uses for the attach 419 * and perf data files. 420 * 421 * It is important that this directory is well-known and the 422 * same for all VM instances. It cannot be affected by configuration 423 * variables such as java.io.tmpdir. 424 */ 425 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 426 JVMWrapper("JVM_GetTemporaryDirectory"); 427 HandleMark hm(THREAD); 428 const char* temp_dir = os::get_temp_directory(); 429 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 430 return (jstring) JNIHandles::make_local(env, h()); 431 JVM_END 432 433 434 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 435 436 extern volatile jint vm_created; 437 438 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 439 JVMWrapper("JVM_BeforeHalt"); 440 EventShutdown event; 441 if (event.should_commit()) { 442 event.set_reason("Shutdown requested from Java"); 443 event.commit(); 444 } 445 JVM_END 446 447 448 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 449 before_exit(thread); 450 vm_exit(code); 451 JVM_END 452 453 454 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 455 JVMWrapper("JVM_GC"); 456 if (!DisableExplicitGC) { 457 Universe::heap()->collect(GCCause::_java_lang_system_gc); 458 } 459 JVM_END 460 461 462 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 463 JVMWrapper("JVM_MaxObjectInspectionAge"); 464 return Universe::heap()->millis_since_last_gc(); 465 JVM_END 466 467 468 static inline jlong convert_size_t_to_jlong(size_t val) { 469 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 470 NOT_LP64 (return (jlong)val;) 471 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 472 } 473 474 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 475 JVMWrapper("JVM_TotalMemory"); 476 size_t n = Universe::heap()->capacity(); 477 return convert_size_t_to_jlong(n); 478 JVM_END 479 480 481 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 482 JVMWrapper("JVM_FreeMemory"); 483 CollectedHeap* ch = Universe::heap(); 484 size_t n; 485 { 486 MutexLocker x(Heap_lock); 487 n = ch->capacity() - ch->used(); 488 } 489 return convert_size_t_to_jlong(n); 490 JVM_END 491 492 493 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 494 JVMWrapper("JVM_MaxMemory"); 495 size_t n = Universe::heap()->max_capacity(); 496 return convert_size_t_to_jlong(n); 497 JVM_END 498 499 500 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 501 JVMWrapper("JVM_ActiveProcessorCount"); 502 return os::active_processor_count(); 503 JVM_END 504 505 506 507 // java.lang.Throwable ////////////////////////////////////////////////////// 508 509 510 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 511 JVMWrapper("JVM_FillInStackTrace"); 512 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 513 java_lang_Throwable::fill_in_stack_trace(exception); 514 JVM_END 515 516 517 // java.lang.StackTraceElement ////////////////////////////////////////////// 518 519 520 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 521 JVMWrapper("JVM_InitStackTraceElementArray"); 522 Handle exception(THREAD, JNIHandles::resolve(throwable)); 523 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 524 objArrayHandle stack_trace(THREAD, st); 525 // Fill in the allocated stack trace 526 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 527 JVM_END 528 529 530 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 531 JVMWrapper("JVM_InitStackTraceElement"); 532 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 533 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 534 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 535 JVM_END 536 537 538 // java.lang.StackWalker ////////////////////////////////////////////////////// 539 540 541 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 542 jint skip_frames, jint frame_count, jint start_index, 543 jobjectArray frames)) 544 JVMWrapper("JVM_CallStackWalk"); 545 JavaThread* jt = (JavaThread*) THREAD; 546 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 547 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 548 } 549 550 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 551 552 // frames array is a Class<?>[] array when only getting caller reference, 553 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 554 // be null. 555 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 556 objArrayHandle frames_array_h(THREAD, fa); 557 558 int limit = start_index + frame_count; 559 if (frames_array_h->length() < limit) { 560 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 561 } 562 563 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 564 start_index, frames_array_h, CHECK_NULL); 565 return JNIHandles::make_local(env, result); 566 JVM_END 567 568 569 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 570 jint frame_count, jint start_index, 571 jobjectArray frames)) 572 JVMWrapper("JVM_MoreStackWalk"); 573 JavaThread* jt = (JavaThread*) THREAD; 574 575 // frames array is a Class<?>[] array when only getting caller reference, 576 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 577 // be null. 578 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 579 objArrayHandle frames_array_h(THREAD, fa); 580 581 int limit = start_index+frame_count; 582 if (frames_array_h->length() < limit) { 583 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 584 } 585 586 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 587 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 588 start_index, frames_array_h, THREAD); 589 JVM_END 590 591 // java.lang.Object /////////////////////////////////////////////// 592 593 594 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 595 JVMWrapper("JVM_IHashCode"); 596 // as implemented in the classic virtual machine; return 0 if object is NULL 597 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 598 JVM_END 599 600 601 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 602 JVMWrapper("JVM_MonitorWait"); 603 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 604 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 605 if (JvmtiExport::should_post_monitor_wait()) { 606 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 607 608 // The current thread already owns the monitor and it has not yet 609 // been added to the wait queue so the current thread cannot be 610 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 611 // event handler cannot accidentally consume an unpark() meant for 612 // the ParkEvent associated with this ObjectMonitor. 613 } 614 ObjectSynchronizer::wait(obj, ms, CHECK); 615 JVM_END 616 617 618 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 619 JVMWrapper("JVM_MonitorNotify"); 620 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 621 ObjectSynchronizer::notify(obj, CHECK); 622 JVM_END 623 624 625 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 626 JVMWrapper("JVM_MonitorNotifyAll"); 627 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 628 ObjectSynchronizer::notifyall(obj, CHECK); 629 JVM_END 630 631 632 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 633 JVMWrapper("JVM_Clone"); 634 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 635 Klass* klass = obj->klass(); 636 JvmtiVMObjectAllocEventCollector oam; 637 638 #ifdef ASSERT 639 // Just checking that the cloneable flag is set correct 640 if (obj->is_array()) { 641 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 642 } else { 643 guarantee(obj->is_instance(), "should be instanceOop"); 644 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 645 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 646 } 647 #endif 648 649 // Check if class of obj supports the Cloneable interface. 650 // All arrays are considered to be cloneable (See JLS 20.1.5). 651 // All j.l.r.Reference classes are considered non-cloneable. 652 if (!klass->is_cloneable() || 653 (klass->is_instance_klass() && 654 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 655 ResourceMark rm(THREAD); 656 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 657 } 658 659 // Make shallow object copy 660 const int size = obj->size(); 661 oop new_obj_oop = NULL; 662 if (obj->is_array()) { 663 const int length = ((arrayOop)obj())->length(); 664 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 665 } else { 666 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 667 } 668 669 HeapAccess<>::clone(obj(), new_obj_oop, size); 670 671 Handle new_obj(THREAD, new_obj_oop); 672 // Caution: this involves a java upcall, so the clone should be 673 // "gc-robust" by this stage. 674 if (klass->has_finalizer()) { 675 assert(obj->is_instance(), "should be instanceOop"); 676 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 677 new_obj = Handle(THREAD, new_obj_oop); 678 } 679 680 return JNIHandles::make_local(env, new_obj()); 681 JVM_END 682 683 // java.io.File /////////////////////////////////////////////////////////////// 684 685 JVM_LEAF(char*, JVM_NativePath(char* path)) 686 JVMWrapper("JVM_NativePath"); 687 return os::native_path(path); 688 JVM_END 689 690 691 // Misc. class handling /////////////////////////////////////////////////////////// 692 693 694 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 695 JVMWrapper("JVM_GetCallerClass"); 696 697 // Getting the class of the caller frame. 698 // 699 // The call stack at this point looks something like this: 700 // 701 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 702 // [1] [ @CallerSensitive API.method ] 703 // [.] [ (skipped intermediate frames) ] 704 // [n] [ caller ] 705 vframeStream vfst(thread); 706 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 707 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 708 Method* m = vfst.method(); 709 assert(m != NULL, "sanity"); 710 switch (n) { 711 case 0: 712 // This must only be called from Reflection.getCallerClass 713 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 714 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 715 } 716 // fall-through 717 case 1: 718 // Frame 0 and 1 must be caller sensitive. 719 if (!m->caller_sensitive()) { 720 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 721 } 722 break; 723 default: 724 if (!m->is_ignored_by_security_stack_walk()) { 725 // We have reached the desired frame; return the holder class. 726 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 727 } 728 break; 729 } 730 } 731 return NULL; 732 JVM_END 733 734 735 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 736 JVMWrapper("JVM_FindPrimitiveClass"); 737 oop mirror = NULL; 738 BasicType t = name2type(utf); 739 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 740 mirror = Universe::java_mirror(t); 741 } 742 if (mirror == NULL) { 743 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 744 } else { 745 return (jclass) JNIHandles::make_local(env, mirror); 746 } 747 JVM_END 748 749 750 // Returns a class loaded by the bootstrap class loader; or null 751 // if not found. ClassNotFoundException is not thrown. 752 // FindClassFromBootLoader is exported to the launcher for windows. 753 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 754 const char* name)) 755 JVMWrapper("JVM_FindClassFromBootLoader"); 756 757 // Java libraries should ensure that name is never null... 758 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 759 // It's impossible to create this class; the name cannot fit 760 // into the constant pool. 761 return NULL; 762 } 763 764 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 765 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 766 if (k == NULL) { 767 return NULL; 768 } 769 770 if (log_is_enabled(Debug, class, resolve)) { 771 trace_class_resolution(k); 772 } 773 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 774 JVM_END 775 776 // Find a class with this name in this loader, using the caller's protection domain. 777 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 778 jboolean init, jobject loader, 779 jclass caller)) 780 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 781 // Java libraries should ensure that name is never null... 782 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 783 // It's impossible to create this class; the name cannot fit 784 // into the constant pool. 785 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 786 } 787 788 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 789 790 oop loader_oop = JNIHandles::resolve(loader); 791 oop from_class = JNIHandles::resolve(caller); 792 oop protection_domain = NULL; 793 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 794 // NPE. Put it in another way, the bootstrap class loader has all permission and 795 // thus no checkPackageAccess equivalence in the VM class loader. 796 // The caller is also passed as NULL by the java code if there is no security 797 // manager to avoid the performance cost of getting the calling class. 798 if (from_class != NULL && loader_oop != NULL) { 799 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 800 } 801 802 Handle h_loader(THREAD, loader_oop); 803 Handle h_prot(THREAD, protection_domain); 804 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 805 h_prot, false, THREAD); 806 807 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 808 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 809 } 810 return result; 811 JVM_END 812 813 // Currently only called from the old verifier. 814 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 815 jboolean init, jclass from)) 816 JVMWrapper("JVM_FindClassFromClass"); 817 if (name == NULL) { 818 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 819 } 820 if ((int)strlen(name) > Symbol::max_length()) { 821 // It's impossible to create this class; the name cannot fit 822 // into the constant pool. 823 Exceptions::fthrow(THREAD_AND_LOCATION, 824 vmSymbols::java_lang_NoClassDefFoundError(), 825 "Class name exceeds maximum length of %d: %s", 826 Symbol::max_length(), 827 name); 828 return 0; 829 } 830 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 831 oop from_class_oop = JNIHandles::resolve(from); 832 Klass* from_class = (from_class_oop == NULL) 833 ? (Klass*)NULL 834 : java_lang_Class::as_Klass(from_class_oop); 835 oop class_loader = NULL; 836 oop protection_domain = NULL; 837 if (from_class != NULL) { 838 class_loader = from_class->class_loader(); 839 protection_domain = from_class->protection_domain(); 840 } 841 Handle h_loader(THREAD, class_loader); 842 Handle h_prot (THREAD, protection_domain); 843 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 844 h_prot, true, thread); 845 if (result != NULL) { 846 oop mirror = JNIHandles::resolve_non_null(result); 847 Klass* to_class = java_lang_Class::as_Klass(mirror); 848 ClassLoaderData::class_loader_data(h_loader())->record_dependency(to_class); 849 } 850 851 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 852 // this function is generally only used for class loading during verification. 853 ResourceMark rm; 854 oop from_mirror = JNIHandles::resolve_non_null(from); 855 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 856 const char * from_name = from_class->external_name(); 857 858 oop mirror = JNIHandles::resolve_non_null(result); 859 Klass* to_class = java_lang_Class::as_Klass(mirror); 860 const char * to = to_class->external_name(); 861 log_debug(class, resolve)("%s %s (verification)", from_name, to); 862 } 863 864 return result; 865 JVM_END 866 867 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 868 if (loader.is_null()) { 869 return; 870 } 871 872 // check whether the current caller thread holds the lock or not. 873 // If not, increment the corresponding counter 874 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 875 ObjectSynchronizer::owner_self) { 876 counter->inc(); 877 } 878 } 879 880 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 881 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 882 jobject loader, const jbyte *buf, 883 jsize len, jobject pd, const char *source, 884 TRAPS) { 885 if (source == NULL) source = "__JVM_DefineClass__"; 886 887 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 888 JavaThread* jt = (JavaThread*) THREAD; 889 890 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 891 ClassLoader::perf_define_appclass_selftime(), 892 ClassLoader::perf_define_appclasses(), 893 jt->get_thread_stat()->perf_recursion_counts_addr(), 894 jt->get_thread_stat()->perf_timers_addr(), 895 PerfClassTraceTime::DEFINE_CLASS); 896 897 if (UsePerfData) { 898 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 899 } 900 901 // Since exceptions can be thrown, class initialization can take place 902 // if name is NULL no check for class name in .class stream has to be made. 903 TempNewSymbol class_name = NULL; 904 if (name != NULL) { 905 const int str_len = (int)strlen(name); 906 if (str_len > Symbol::max_length()) { 907 // It's impossible to create this class; the name cannot fit 908 // into the constant pool. 909 Exceptions::fthrow(THREAD_AND_LOCATION, 910 vmSymbols::java_lang_NoClassDefFoundError(), 911 "Class name exceeds maximum length of %d: %s", 912 Symbol::max_length(), 913 name); 914 return 0; 915 } 916 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 917 } 918 919 ResourceMark rm(THREAD); 920 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 921 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 922 if (UsePerfData) { 923 is_lock_held_by_thread(class_loader, 924 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 925 THREAD); 926 } 927 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 928 Klass* k = SystemDictionary::resolve_from_stream(class_name, 929 class_loader, 930 protection_domain, 931 &st, 932 CHECK_NULL); 933 934 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 935 trace_class_resolution(k); 936 } 937 938 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 939 } 940 941 942 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 943 JVMWrapper("JVM_DefineClass"); 944 945 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 946 JVM_END 947 948 949 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 950 JVMWrapper("JVM_DefineClassWithSource"); 951 952 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 953 JVM_END 954 955 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 956 JVMWrapper("JVM_FindLoadedClass"); 957 ResourceMark rm(THREAD); 958 959 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 960 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 961 962 const char* str = java_lang_String::as_utf8_string(string()); 963 // Sanity check, don't expect null 964 if (str == NULL) return NULL; 965 966 const int str_len = (int)strlen(str); 967 if (str_len > Symbol::max_length()) { 968 // It's impossible to create this class; the name cannot fit 969 // into the constant pool. 970 return NULL; 971 } 972 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 973 974 // Security Note: 975 // The Java level wrapper will perform the necessary security check allowing 976 // us to pass the NULL as the initiating class loader. 977 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 978 if (UsePerfData) { 979 is_lock_held_by_thread(h_loader, 980 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 981 THREAD); 982 } 983 984 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 985 h_loader, 986 Handle(), 987 CHECK_NULL); 988 #if INCLUDE_CDS 989 if (k == NULL) { 990 // If the class is not already loaded, try to see if it's in the shared 991 // archive for the current classloader (h_loader). 992 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 993 } 994 #endif 995 return (k == NULL) ? NULL : 996 (jclass) JNIHandles::make_local(env, k->java_mirror()); 997 JVM_END 998 999 // Module support ////////////////////////////////////////////////////////////////////////////// 1000 1001 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1002 jstring location, const char* const* packages, jsize num_packages)) 1003 JVMWrapper("JVM_DefineModule"); 1004 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1005 JVM_END 1006 1007 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1008 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1009 Modules::set_bootloader_unnamed_module(module, CHECK); 1010 JVM_END 1011 1012 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1013 JVMWrapper("JVM_AddModuleExports"); 1014 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1015 JVM_END 1016 1017 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1018 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1019 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1020 JVM_END 1021 1022 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1023 JVMWrapper("JVM_AddModuleExportsToAll"); 1024 Modules::add_module_exports(from_module, package, NULL, CHECK); 1025 JVM_END 1026 1027 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1028 JVMWrapper("JVM_AddReadsModule"); 1029 Modules::add_reads_module(from_module, source_module, CHECK); 1030 JVM_END 1031 1032 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1033 1034 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1035 assert (cls != NULL, "illegal class"); 1036 JVMWrapper("JVM_GetClassName"); 1037 JvmtiVMObjectAllocEventCollector oam; 1038 ResourceMark rm(THREAD); 1039 const char* name; 1040 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1041 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1042 } else { 1043 // Consider caching interned string in Klass 1044 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1045 assert(k->is_klass(), "just checking"); 1046 name = k->external_name(); 1047 } 1048 oop result = StringTable::intern((char*) name, CHECK_NULL); 1049 return (jstring) JNIHandles::make_local(env, result); 1050 JVM_END 1051 1052 1053 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1054 JVMWrapper("JVM_GetClassInterfaces"); 1055 JvmtiVMObjectAllocEventCollector oam; 1056 oop mirror = JNIHandles::resolve_non_null(cls); 1057 1058 // Special handling for primitive objects 1059 if (java_lang_Class::is_primitive(mirror)) { 1060 // Primitive objects does not have any interfaces 1061 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1062 return (jobjectArray) JNIHandles::make_local(env, r); 1063 } 1064 1065 Klass* klass = java_lang_Class::as_Klass(mirror); 1066 // Figure size of result array 1067 int size; 1068 if (klass->is_instance_klass()) { 1069 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1070 } else { 1071 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1072 size = 2; 1073 } 1074 1075 // Allocate result array 1076 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1077 objArrayHandle result (THREAD, r); 1078 // Fill in result 1079 if (klass->is_instance_klass()) { 1080 // Regular instance klass, fill in all local interfaces 1081 for (int index = 0; index < size; index++) { 1082 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1083 result->obj_at_put(index, k->java_mirror()); 1084 } 1085 } else { 1086 // All arrays implement java.lang.Cloneable and java.io.Serializable 1087 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1088 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1089 } 1090 return (jobjectArray) JNIHandles::make_local(env, result()); 1091 JVM_END 1092 1093 1094 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1095 JVMWrapper("JVM_IsInterface"); 1096 oop mirror = JNIHandles::resolve_non_null(cls); 1097 if (java_lang_Class::is_primitive(mirror)) { 1098 return JNI_FALSE; 1099 } 1100 Klass* k = java_lang_Class::as_Klass(mirror); 1101 jboolean result = k->is_interface(); 1102 assert(!result || k->is_instance_klass(), 1103 "all interfaces are instance types"); 1104 // The compiler intrinsic for isInterface tests the 1105 // Klass::_access_flags bits in the same way. 1106 return result; 1107 JVM_END 1108 1109 1110 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1111 JVMWrapper("JVM_GetClassSigners"); 1112 JvmtiVMObjectAllocEventCollector oam; 1113 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1114 // There are no signers for primitive types 1115 return NULL; 1116 } 1117 1118 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls))); 1119 1120 // If there are no signers set in the class, or if the class 1121 // is an array, return NULL. 1122 if (signers == NULL) return NULL; 1123 1124 // copy of the signers array 1125 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1126 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1127 for (int index = 0; index < signers->length(); index++) { 1128 signers_copy->obj_at_put(index, signers->obj_at(index)); 1129 } 1130 1131 // return the copy 1132 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1133 JVM_END 1134 1135 1136 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1137 JVMWrapper("JVM_SetClassSigners"); 1138 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1139 // This call is ignored for primitive types and arrays. 1140 // Signers are only set once, ClassLoader.java, and thus shouldn't 1141 // be called with an array. Only the bootstrap loader creates arrays. 1142 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1143 if (k->is_instance_klass()) { 1144 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1145 } 1146 } 1147 JVM_END 1148 1149 1150 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1151 JVMWrapper("JVM_GetProtectionDomain"); 1152 if (JNIHandles::resolve(cls) == NULL) { 1153 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1154 } 1155 1156 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1157 // Primitive types does not have a protection domain. 1158 return NULL; 1159 } 1160 1161 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1162 return (jobject) JNIHandles::make_local(env, pd); 1163 JVM_END 1164 1165 1166 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) { 1167 // If there is a security manager and protection domain, check the access 1168 // in the protection domain, otherwise it is authorized. 1169 if (java_lang_System::has_security_manager()) { 1170 1171 // For bootstrapping, if pd implies method isn't in the JDK, allow 1172 // this context to revert to older behavior. 1173 // In this case the isAuthorized field in AccessControlContext is also not 1174 // present. 1175 if (Universe::protection_domain_implies_method() == NULL) { 1176 return true; 1177 } 1178 1179 // Whitelist certain access control contexts 1180 if (java_security_AccessControlContext::is_authorized(context)) { 1181 return true; 1182 } 1183 1184 oop prot = klass->protection_domain(); 1185 if (prot != NULL) { 1186 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1187 // in the new wrapper. 1188 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1189 Handle h_prot(THREAD, prot); 1190 JavaValue result(T_BOOLEAN); 1191 JavaCallArguments args(h_prot); 1192 JavaCalls::call(&result, m, &args, CHECK_false); 1193 return (result.get_jboolean() != 0); 1194 } 1195 } 1196 return true; 1197 } 1198 1199 // Create an AccessControlContext with a protection domain with null codesource 1200 // and null permissions - which gives no permissions. 1201 oop create_dummy_access_control_context(TRAPS) { 1202 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1203 // Call constructor ProtectionDomain(null, null); 1204 Handle obj = JavaCalls::construct_new_instance(pd_klass, 1205 vmSymbols::codesource_permissioncollection_signature(), 1206 Handle(), Handle(), CHECK_NULL); 1207 1208 // new ProtectionDomain[] {pd}; 1209 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1210 context->obj_at_put(0, obj()); 1211 1212 // new AccessControlContext(new ProtectionDomain[] {pd}) 1213 objArrayHandle h_context(THREAD, context); 1214 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1215 return acc; 1216 } 1217 1218 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1219 JVMWrapper("JVM_DoPrivileged"); 1220 1221 if (action == NULL) { 1222 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1223 } 1224 1225 // Compute the frame initiating the do privileged operation and setup the privileged stack 1226 vframeStream vfst(thread); 1227 vfst.security_get_caller_frame(1); 1228 1229 if (vfst.at_end()) { 1230 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1231 } 1232 1233 Method* method = vfst.method(); 1234 InstanceKlass* klass = method->method_holder(); 1235 1236 // Check that action object understands "Object run()" 1237 Handle h_context; 1238 if (context != NULL) { 1239 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1240 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1241 if (!authorized) { 1242 // Create an unprivileged access control object and call it's run function 1243 // instead. 1244 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1245 h_context = Handle(THREAD, noprivs); 1246 } 1247 } 1248 1249 // Check that action object understands "Object run()" 1250 Handle object (THREAD, JNIHandles::resolve(action)); 1251 1252 // get run() method 1253 Method* m_oop = object->klass()->uncached_lookup_method( 1254 vmSymbols::run_method_name(), 1255 vmSymbols::void_object_signature(), 1256 Klass::find_overpass); 1257 1258 // See if there is a default method for "Object run()". 1259 if (m_oop == NULL && object->klass()->is_instance_klass()) { 1260 InstanceKlass* iklass = InstanceKlass::cast(object->klass()); 1261 m_oop = iklass->lookup_method_in_ordered_interfaces( 1262 vmSymbols::run_method_name(), 1263 vmSymbols::void_object_signature()); 1264 } 1265 1266 methodHandle m (THREAD, m_oop); 1267 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) { 1268 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1269 } 1270 1271 // Stack allocated list of privileged stack elements 1272 PrivilegedElement pi; 1273 if (!vfst.at_end()) { 1274 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1275 thread->set_privileged_stack_top(&pi); 1276 } 1277 1278 1279 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1280 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1281 Handle pending_exception; 1282 JavaValue result(T_OBJECT); 1283 JavaCallArguments args(object); 1284 JavaCalls::call(&result, m, &args, THREAD); 1285 1286 // done with action, remove ourselves from the list 1287 if (!vfst.at_end()) { 1288 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1289 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1290 } 1291 1292 if (HAS_PENDING_EXCEPTION) { 1293 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1294 CLEAR_PENDING_EXCEPTION; 1295 // JVMTI has already reported the pending exception 1296 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1297 if (THREAD->is_Java_thread()) { 1298 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1299 } 1300 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1301 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1302 // Throw a java.security.PrivilegedActionException(Exception e) exception 1303 JavaCallArguments args(pending_exception); 1304 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1305 vmSymbols::exception_void_signature(), 1306 &args); 1307 } 1308 } 1309 1310 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1311 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1312 JVM_END 1313 1314 1315 // Returns the inherited_access_control_context field of the running thread. 1316 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1317 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1318 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1319 return JNIHandles::make_local(env, result); 1320 JVM_END 1321 1322 class RegisterArrayForGC { 1323 private: 1324 JavaThread *_thread; 1325 public: 1326 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1327 _thread = thread; 1328 _thread->register_array_for_gc(array); 1329 } 1330 1331 ~RegisterArrayForGC() { 1332 _thread->register_array_for_gc(NULL); 1333 } 1334 }; 1335 1336 1337 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1338 JVMWrapper("JVM_GetStackAccessControlContext"); 1339 if (!UsePrivilegedStack) return NULL; 1340 1341 ResourceMark rm(THREAD); 1342 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1343 JvmtiVMObjectAllocEventCollector oam; 1344 1345 // count the protection domains on the execution stack. We collapse 1346 // duplicate consecutive protection domains into a single one, as 1347 // well as stopping when we hit a privileged frame. 1348 1349 // Use vframeStream to iterate through Java frames 1350 vframeStream vfst(thread); 1351 1352 oop previous_protection_domain = NULL; 1353 Handle privileged_context(thread, NULL); 1354 bool is_privileged = false; 1355 oop protection_domain = NULL; 1356 1357 for(; !vfst.at_end(); vfst.next()) { 1358 // get method of frame 1359 Method* method = vfst.method(); 1360 intptr_t* frame_id = vfst.frame_id(); 1361 1362 // check the privileged frames to see if we have a match 1363 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1364 // this frame is privileged 1365 is_privileged = true; 1366 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1367 protection_domain = thread->privileged_stack_top()->protection_domain(); 1368 } else { 1369 protection_domain = method->method_holder()->protection_domain(); 1370 } 1371 1372 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) { 1373 local_array->push(protection_domain); 1374 previous_protection_domain = protection_domain; 1375 } 1376 1377 if (is_privileged) break; 1378 } 1379 1380 1381 // either all the domains on the stack were system domains, or 1382 // we had a privileged system domain 1383 if (local_array->is_empty()) { 1384 if (is_privileged && privileged_context.is_null()) return NULL; 1385 1386 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1387 return JNIHandles::make_local(env, result); 1388 } 1389 1390 // the resource area must be registered in case of a gc 1391 RegisterArrayForGC ragc(thread, local_array); 1392 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1393 local_array->length(), CHECK_NULL); 1394 objArrayHandle h_context(thread, context); 1395 for (int index = 0; index < local_array->length(); index++) { 1396 h_context->obj_at_put(index, local_array->at(index)); 1397 } 1398 1399 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1400 1401 return JNIHandles::make_local(env, result); 1402 JVM_END 1403 1404 1405 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1406 JVMWrapper("JVM_IsArrayClass"); 1407 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1408 return (k != NULL) && k->is_array_klass() ? true : false; 1409 JVM_END 1410 1411 1412 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1413 JVMWrapper("JVM_IsPrimitiveClass"); 1414 oop mirror = JNIHandles::resolve_non_null(cls); 1415 return (jboolean) java_lang_Class::is_primitive(mirror); 1416 JVM_END 1417 1418 1419 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1420 JVMWrapper("JVM_GetClassModifiers"); 1421 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1422 // Primitive type 1423 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1424 } 1425 1426 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1427 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1428 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1429 return k->modifier_flags(); 1430 JVM_END 1431 1432 1433 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1434 1435 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1436 JvmtiVMObjectAllocEventCollector oam; 1437 // ofClass is a reference to a java_lang_Class object. The mirror object 1438 // of an InstanceKlass 1439 1440 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1441 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1442 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1443 return (jobjectArray)JNIHandles::make_local(env, result); 1444 } 1445 1446 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1447 InnerClassesIterator iter(k); 1448 1449 if (iter.length() == 0) { 1450 // Neither an inner nor outer class 1451 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1452 return (jobjectArray)JNIHandles::make_local(env, result); 1453 } 1454 1455 // find inner class info 1456 constantPoolHandle cp(thread, k->constants()); 1457 int length = iter.length(); 1458 1459 // Allocate temp. result array 1460 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1461 objArrayHandle result (THREAD, r); 1462 int members = 0; 1463 1464 for (; !iter.done(); iter.next()) { 1465 int ioff = iter.inner_class_info_index(); 1466 int ooff = iter.outer_class_info_index(); 1467 1468 if (ioff != 0 && ooff != 0) { 1469 // Check to see if the name matches the class we're looking for 1470 // before attempting to find the class. 1471 if (cp->klass_name_at_matches(k, ooff)) { 1472 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1473 if (outer_klass == k) { 1474 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1475 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1476 1477 // Throws an exception if outer klass has not declared k as 1478 // an inner klass 1479 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1480 1481 result->obj_at_put(members, inner_klass->java_mirror()); 1482 members++; 1483 } 1484 } 1485 } 1486 } 1487 1488 if (members != length) { 1489 // Return array of right length 1490 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1491 for(int i = 0; i < members; i++) { 1492 res->obj_at_put(i, result->obj_at(i)); 1493 } 1494 return (jobjectArray)JNIHandles::make_local(env, res); 1495 } 1496 1497 return (jobjectArray)JNIHandles::make_local(env, result()); 1498 JVM_END 1499 1500 1501 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1502 { 1503 // ofClass is a reference to a java_lang_Class object. 1504 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1505 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1506 return NULL; 1507 } 1508 1509 bool inner_is_member = false; 1510 Klass* outer_klass 1511 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1512 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1513 if (outer_klass == NULL) return NULL; // already a top-level class 1514 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1515 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1516 } 1517 JVM_END 1518 1519 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1520 { 1521 oop mirror = JNIHandles::resolve_non_null(cls); 1522 if (java_lang_Class::is_primitive(mirror) || 1523 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1524 return NULL; 1525 } 1526 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1527 int ooff = 0, noff = 0; 1528 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1529 if (noff != 0) { 1530 constantPoolHandle i_cp(thread, k->constants()); 1531 Symbol* name = i_cp->symbol_at(noff); 1532 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1533 return (jstring) JNIHandles::make_local(env, str()); 1534 } 1535 } 1536 return NULL; 1537 } 1538 JVM_END 1539 1540 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1541 assert (cls != NULL, "illegal class"); 1542 JVMWrapper("JVM_GetClassSignature"); 1543 JvmtiVMObjectAllocEventCollector oam; 1544 ResourceMark rm(THREAD); 1545 // Return null for arrays and primatives 1546 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1547 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1548 if (k->is_instance_klass()) { 1549 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1550 if (sym == NULL) return NULL; 1551 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1552 return (jstring) JNIHandles::make_local(env, str()); 1553 } 1554 } 1555 return NULL; 1556 JVM_END 1557 1558 1559 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1560 assert (cls != NULL, "illegal class"); 1561 JVMWrapper("JVM_GetClassAnnotations"); 1562 1563 // Return null for arrays and primitives 1564 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1565 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1566 if (k->is_instance_klass()) { 1567 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1568 return (jbyteArray) JNIHandles::make_local(env, a); 1569 } 1570 } 1571 return NULL; 1572 JVM_END 1573 1574 1575 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1576 // some of this code was adapted from from jni_FromReflectedField 1577 1578 oop reflected = JNIHandles::resolve_non_null(field); 1579 oop mirror = java_lang_reflect_Field::clazz(reflected); 1580 Klass* k = java_lang_Class::as_Klass(mirror); 1581 int slot = java_lang_reflect_Field::slot(reflected); 1582 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1583 1584 InstanceKlass* ik = InstanceKlass::cast(k); 1585 intptr_t offset = ik->field_offset(slot); 1586 1587 if (modifiers & JVM_ACC_STATIC) { 1588 // for static fields we only look in the current class 1589 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1590 assert(false, "cannot find static field"); 1591 return false; 1592 } 1593 } else { 1594 // for instance fields we start with the current class and work 1595 // our way up through the superclass chain 1596 if (!ik->find_field_from_offset(offset, false, &fd)) { 1597 assert(false, "cannot find instance field"); 1598 return false; 1599 } 1600 } 1601 return true; 1602 } 1603 1604 static Method* jvm_get_method_common(jobject method) { 1605 // some of this code was adapted from from jni_FromReflectedMethod 1606 1607 oop reflected = JNIHandles::resolve_non_null(method); 1608 oop mirror = NULL; 1609 int slot = 0; 1610 1611 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1612 mirror = java_lang_reflect_Constructor::clazz(reflected); 1613 slot = java_lang_reflect_Constructor::slot(reflected); 1614 } else { 1615 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1616 "wrong type"); 1617 mirror = java_lang_reflect_Method::clazz(reflected); 1618 slot = java_lang_reflect_Method::slot(reflected); 1619 } 1620 Klass* k = java_lang_Class::as_Klass(mirror); 1621 1622 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1623 assert(m != NULL, "cannot find method"); 1624 return m; // caller has to deal with NULL in product mode 1625 } 1626 1627 /* Type use annotations support (JDK 1.8) */ 1628 1629 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1630 assert (cls != NULL, "illegal class"); 1631 JVMWrapper("JVM_GetClassTypeAnnotations"); 1632 ResourceMark rm(THREAD); 1633 // Return null for arrays and primitives 1634 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1635 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1636 if (k->is_instance_klass()) { 1637 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1638 if (type_annotations != NULL) { 1639 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1640 return (jbyteArray) JNIHandles::make_local(env, a); 1641 } 1642 } 1643 } 1644 return NULL; 1645 JVM_END 1646 1647 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1648 assert (method != NULL, "illegal method"); 1649 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1650 1651 // method is a handle to a java.lang.reflect.Method object 1652 Method* m = jvm_get_method_common(method); 1653 if (m == NULL) { 1654 return NULL; 1655 } 1656 1657 AnnotationArray* type_annotations = m->type_annotations(); 1658 if (type_annotations != NULL) { 1659 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1660 return (jbyteArray) JNIHandles::make_local(env, a); 1661 } 1662 1663 return NULL; 1664 JVM_END 1665 1666 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1667 assert (field != NULL, "illegal field"); 1668 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1669 1670 fieldDescriptor fd; 1671 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1672 if (!gotFd) { 1673 return NULL; 1674 } 1675 1676 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1677 JVM_END 1678 1679 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1680 if (!cp->is_within_bounds(index)) { 1681 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1682 } 1683 } 1684 1685 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1686 { 1687 JVMWrapper("JVM_GetMethodParameters"); 1688 // method is a handle to a java.lang.reflect.Method object 1689 Method* method_ptr = jvm_get_method_common(method); 1690 methodHandle mh (THREAD, method_ptr); 1691 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1692 const int num_params = mh->method_parameters_length(); 1693 1694 if (num_params < 0) { 1695 // A -1 return value from method_parameters_length means there is no 1696 // parameter data. Return null to indicate this to the reflection 1697 // API. 1698 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1699 return (jobjectArray)NULL; 1700 } else { 1701 // Otherwise, we return something up to reflection, even if it is 1702 // a zero-length array. Why? Because in some cases this can 1703 // trigger a MalformedParametersException. 1704 1705 // make sure all the symbols are properly formatted 1706 for (int i = 0; i < num_params; i++) { 1707 MethodParametersElement* params = mh->method_parameters_start(); 1708 int index = params[i].name_cp_index; 1709 bounds_check(mh->constants(), index, CHECK_NULL); 1710 1711 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1712 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1713 "Wrong type at constant pool index"); 1714 } 1715 1716 } 1717 1718 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1719 objArrayHandle result (THREAD, result_oop); 1720 1721 for (int i = 0; i < num_params; i++) { 1722 MethodParametersElement* params = mh->method_parameters_start(); 1723 // For a 0 index, give a NULL symbol 1724 Symbol* sym = 0 != params[i].name_cp_index ? 1725 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1726 int flags = params[i].flags; 1727 oop param = Reflection::new_parameter(reflected_method, i, sym, 1728 flags, CHECK_NULL); 1729 result->obj_at_put(i, param); 1730 } 1731 return (jobjectArray)JNIHandles::make_local(env, result()); 1732 } 1733 } 1734 JVM_END 1735 1736 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1737 1738 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1739 { 1740 JVMWrapper("JVM_GetClassDeclaredFields"); 1741 JvmtiVMObjectAllocEventCollector oam; 1742 1743 // Exclude primitive types and array types 1744 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1745 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1746 // Return empty array 1747 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1748 return (jobjectArray) JNIHandles::make_local(env, res); 1749 } 1750 1751 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1752 constantPoolHandle cp(THREAD, k->constants()); 1753 1754 // Ensure class is linked 1755 k->link_class(CHECK_NULL); 1756 1757 // Allocate result 1758 int num_fields; 1759 1760 if (publicOnly) { 1761 num_fields = 0; 1762 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1763 if (fs.access_flags().is_public()) ++num_fields; 1764 } 1765 } else { 1766 num_fields = k->java_fields_count(); 1767 } 1768 1769 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1770 objArrayHandle result (THREAD, r); 1771 1772 int out_idx = 0; 1773 fieldDescriptor fd; 1774 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1775 if (!publicOnly || fs.access_flags().is_public()) { 1776 fd.reinitialize(k, fs.index()); 1777 oop field = Reflection::new_field(&fd, CHECK_NULL); 1778 result->obj_at_put(out_idx, field); 1779 ++out_idx; 1780 } 1781 } 1782 assert(out_idx == num_fields, "just checking"); 1783 return (jobjectArray) JNIHandles::make_local(env, result()); 1784 } 1785 JVM_END 1786 1787 static bool select_method(const methodHandle& method, bool want_constructor) { 1788 if (want_constructor) { 1789 return (method->is_initializer() && !method->is_static()); 1790 } else { 1791 return (!method->is_initializer() && !method->is_overpass()); 1792 } 1793 } 1794 1795 static jobjectArray get_class_declared_methods_helper( 1796 JNIEnv *env, 1797 jclass ofClass, jboolean publicOnly, 1798 bool want_constructor, 1799 Klass* klass, TRAPS) { 1800 1801 JvmtiVMObjectAllocEventCollector oam; 1802 1803 // Exclude primitive types and array types 1804 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1805 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1806 // Return empty array 1807 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1808 return (jobjectArray) JNIHandles::make_local(env, res); 1809 } 1810 1811 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1812 1813 // Ensure class is linked 1814 k->link_class(CHECK_NULL); 1815 1816 Array<Method*>* methods = k->methods(); 1817 int methods_length = methods->length(); 1818 1819 // Save original method_idnum in case of redefinition, which can change 1820 // the idnum of obsolete methods. The new method will have the same idnum 1821 // but if we refresh the methods array, the counts will be wrong. 1822 ResourceMark rm(THREAD); 1823 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1824 int num_methods = 0; 1825 1826 for (int i = 0; i < methods_length; i++) { 1827 methodHandle method(THREAD, methods->at(i)); 1828 if (select_method(method, want_constructor)) { 1829 if (!publicOnly || method->is_public()) { 1830 idnums->push(method->method_idnum()); 1831 ++num_methods; 1832 } 1833 } 1834 } 1835 1836 // Allocate result 1837 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1838 objArrayHandle result (THREAD, r); 1839 1840 // Now just put the methods that we selected above, but go by their idnum 1841 // in case of redefinition. The methods can be redefined at any safepoint, 1842 // so above when allocating the oop array and below when creating reflect 1843 // objects. 1844 for (int i = 0; i < num_methods; i++) { 1845 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1846 if (method.is_null()) { 1847 // Method may have been deleted and seems this API can handle null 1848 // Otherwise should probably put a method that throws NSME 1849 result->obj_at_put(i, NULL); 1850 } else { 1851 oop m; 1852 if (want_constructor) { 1853 m = Reflection::new_constructor(method, CHECK_NULL); 1854 } else { 1855 m = Reflection::new_method(method, false, CHECK_NULL); 1856 } 1857 result->obj_at_put(i, m); 1858 } 1859 } 1860 1861 return (jobjectArray) JNIHandles::make_local(env, result()); 1862 } 1863 1864 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1865 { 1866 JVMWrapper("JVM_GetClassDeclaredMethods"); 1867 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1868 /*want_constructor*/ false, 1869 SystemDictionary::reflect_Method_klass(), THREAD); 1870 } 1871 JVM_END 1872 1873 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1874 { 1875 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1876 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1877 /*want_constructor*/ true, 1878 SystemDictionary::reflect_Constructor_klass(), THREAD); 1879 } 1880 JVM_END 1881 1882 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1883 { 1884 JVMWrapper("JVM_GetClassAccessFlags"); 1885 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1886 // Primitive type 1887 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1888 } 1889 1890 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1891 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1892 } 1893 JVM_END 1894 1895 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1896 { 1897 JVMWrapper("JVM_AreNestMates"); 1898 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1899 assert(c->is_instance_klass(), "must be"); 1900 InstanceKlass* ck = InstanceKlass::cast(c); 1901 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 1902 assert(m->is_instance_klass(), "must be"); 1903 InstanceKlass* mk = InstanceKlass::cast(m); 1904 return ck->has_nestmate_access_to(mk, THREAD); 1905 } 1906 JVM_END 1907 1908 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1909 { 1910 // current is not a primitive or array class 1911 JVMWrapper("JVM_GetNestHost"); 1912 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1913 assert(c->is_instance_klass(), "must be"); 1914 InstanceKlass* ck = InstanceKlass::cast(c); 1915 // Don't post exceptions if validation fails 1916 InstanceKlass* host = ck->nest_host(NULL, THREAD); 1917 return (jclass) (host == NULL ? NULL : 1918 JNIHandles::make_local(THREAD, host->java_mirror())); 1919 } 1920 JVM_END 1921 1922 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1923 { 1924 // current is not a primitive or array class 1925 JVMWrapper("JVM_GetNestMembers"); 1926 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1927 assert(c->is_instance_klass(), "must be"); 1928 InstanceKlass* ck = InstanceKlass::cast(c); 1929 // Get the nest host for this nest - throw ICCE if validation fails 1930 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError(); 1931 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL); 1932 1933 { 1934 JvmtiVMObjectAllocEventCollector oam; 1935 Array<u2>* members = host->nest_members(); 1936 int length = members == NULL ? 0 : members->length(); 1937 // nest host is first in the array so make it one bigger 1938 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 1939 length + 1, CHECK_NULL); 1940 objArrayHandle result (THREAD, r); 1941 result->obj_at_put(0, host->java_mirror()); 1942 if (length != 0) { 1943 int i; 1944 for (i = 0; i < length; i++) { 1945 int cp_index = members->at(i); 1946 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL); 1947 if (k->is_instance_klass()) { 1948 InstanceKlass* nest_host_k = 1949 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL); 1950 if (nest_host_k == host) { 1951 result->obj_at_put(i+1, k->java_mirror()); 1952 } 1953 else { 1954 // k's nest host is legal but it isn't our host so 1955 // throw ICCE 1956 ResourceMark rm(THREAD); 1957 Exceptions::fthrow(THREAD_AND_LOCATION, 1958 icce, 1959 "Nest member %s in %s declares a different nest host of %s", 1960 k->external_name(), 1961 host->external_name(), 1962 nest_host_k->external_name() 1963 ); 1964 return NULL; 1965 } 1966 } 1967 else { 1968 // we have a bad nest member entry - throw ICCE 1969 ResourceMark rm(THREAD); 1970 Exceptions::fthrow(THREAD_AND_LOCATION, 1971 icce, 1972 "Class %s can not be a nest member of %s", 1973 k->external_name(), 1974 host->external_name() 1975 ); 1976 return NULL; 1977 } 1978 } 1979 } 1980 else { 1981 assert(host == ck, "must be singleton nest"); 1982 } 1983 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1984 } 1985 } 1986 JVM_END 1987 1988 // Constant pool access ////////////////////////////////////////////////////////// 1989 1990 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1991 { 1992 JVMWrapper("JVM_GetClassConstantPool"); 1993 JvmtiVMObjectAllocEventCollector oam; 1994 1995 // Return null for primitives and arrays 1996 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1997 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1998 if (k->is_instance_klass()) { 1999 InstanceKlass* k_h = InstanceKlass::cast(k); 2000 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2001 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2002 return JNIHandles::make_local(jcp()); 2003 } 2004 } 2005 return NULL; 2006 } 2007 JVM_END 2008 2009 2010 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2011 { 2012 JVMWrapper("JVM_ConstantPoolGetSize"); 2013 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2014 return cp->length(); 2015 } 2016 JVM_END 2017 2018 2019 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2020 { 2021 JVMWrapper("JVM_ConstantPoolGetClassAt"); 2022 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2023 bounds_check(cp, index, CHECK_NULL); 2024 constantTag tag = cp->tag_at(index); 2025 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2026 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2027 } 2028 Klass* k = cp->klass_at(index, CHECK_NULL); 2029 return (jclass) JNIHandles::make_local(k->java_mirror()); 2030 } 2031 JVM_END 2032 2033 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2034 { 2035 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 2036 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2037 bounds_check(cp, index, CHECK_NULL); 2038 constantTag tag = cp->tag_at(index); 2039 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2040 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2041 } 2042 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2043 if (k == NULL) return NULL; 2044 return (jclass) JNIHandles::make_local(k->java_mirror()); 2045 } 2046 JVM_END 2047 2048 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2049 constantTag tag = cp->tag_at(index); 2050 if (!tag.is_method() && !tag.is_interface_method()) { 2051 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2052 } 2053 int klass_ref = cp->uncached_klass_ref_index_at(index); 2054 Klass* k_o; 2055 if (force_resolution) { 2056 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2057 } else { 2058 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2059 if (k_o == NULL) return NULL; 2060 } 2061 InstanceKlass* k = InstanceKlass::cast(k_o); 2062 Symbol* name = cp->uncached_name_ref_at(index); 2063 Symbol* sig = cp->uncached_signature_ref_at(index); 2064 methodHandle m (THREAD, k->find_method(name, sig)); 2065 if (m.is_null()) { 2066 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2067 } 2068 oop method; 2069 if (!m->is_initializer() || m->is_static()) { 2070 method = Reflection::new_method(m, true, CHECK_NULL); 2071 } else { 2072 method = Reflection::new_constructor(m, CHECK_NULL); 2073 } 2074 return JNIHandles::make_local(method); 2075 } 2076 2077 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2078 { 2079 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 2080 JvmtiVMObjectAllocEventCollector oam; 2081 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2082 bounds_check(cp, index, CHECK_NULL); 2083 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2084 return res; 2085 } 2086 JVM_END 2087 2088 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2089 { 2090 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2091 JvmtiVMObjectAllocEventCollector oam; 2092 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2093 bounds_check(cp, index, CHECK_NULL); 2094 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2095 return res; 2096 } 2097 JVM_END 2098 2099 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2100 constantTag tag = cp->tag_at(index); 2101 if (!tag.is_field()) { 2102 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2103 } 2104 int klass_ref = cp->uncached_klass_ref_index_at(index); 2105 Klass* k_o; 2106 if (force_resolution) { 2107 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2108 } else { 2109 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2110 if (k_o == NULL) return NULL; 2111 } 2112 InstanceKlass* k = InstanceKlass::cast(k_o); 2113 Symbol* name = cp->uncached_name_ref_at(index); 2114 Symbol* sig = cp->uncached_signature_ref_at(index); 2115 fieldDescriptor fd; 2116 Klass* target_klass = k->find_field(name, sig, &fd); 2117 if (target_klass == NULL) { 2118 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2119 } 2120 oop field = Reflection::new_field(&fd, CHECK_NULL); 2121 return JNIHandles::make_local(field); 2122 } 2123 2124 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2125 { 2126 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2127 JvmtiVMObjectAllocEventCollector oam; 2128 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2129 bounds_check(cp, index, CHECK_NULL); 2130 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2131 return res; 2132 } 2133 JVM_END 2134 2135 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2136 { 2137 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2138 JvmtiVMObjectAllocEventCollector oam; 2139 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2140 bounds_check(cp, index, CHECK_NULL); 2141 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2142 return res; 2143 } 2144 JVM_END 2145 2146 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2147 { 2148 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2149 JvmtiVMObjectAllocEventCollector oam; 2150 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2151 bounds_check(cp, index, CHECK_NULL); 2152 constantTag tag = cp->tag_at(index); 2153 if (!tag.is_field_or_method()) { 2154 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2155 } 2156 int klass_ref = cp->uncached_klass_ref_index_at(index); 2157 Symbol* klass_name = cp->klass_name_at(klass_ref); 2158 Symbol* member_name = cp->uncached_name_ref_at(index); 2159 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2160 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2161 objArrayHandle dest(THREAD, dest_o); 2162 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2163 dest->obj_at_put(0, str()); 2164 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2165 dest->obj_at_put(1, str()); 2166 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2167 dest->obj_at_put(2, str()); 2168 return (jobjectArray) JNIHandles::make_local(dest()); 2169 } 2170 JVM_END 2171 2172 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2173 { 2174 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2175 JvmtiVMObjectAllocEventCollector oam; 2176 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2177 bounds_check(cp, index, CHECK_0); 2178 constantTag tag = cp->tag_at(index); 2179 if (!tag.is_field_or_method()) { 2180 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2181 } 2182 return (jint) cp->uncached_klass_ref_index_at(index); 2183 } 2184 JVM_END 2185 2186 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2187 { 2188 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2189 JvmtiVMObjectAllocEventCollector oam; 2190 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2191 bounds_check(cp, index, CHECK_0); 2192 constantTag tag = cp->tag_at(index); 2193 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2194 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2195 } 2196 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2197 } 2198 JVM_END 2199 2200 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2201 { 2202 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2203 JvmtiVMObjectAllocEventCollector oam; 2204 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2205 bounds_check(cp, index, CHECK_NULL); 2206 constantTag tag = cp->tag_at(index); 2207 if (!tag.is_name_and_type()) { 2208 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2209 } 2210 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2211 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2212 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2213 objArrayHandle dest(THREAD, dest_o); 2214 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2215 dest->obj_at_put(0, str()); 2216 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2217 dest->obj_at_put(1, str()); 2218 return (jobjectArray) JNIHandles::make_local(dest()); 2219 } 2220 JVM_END 2221 2222 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2223 { 2224 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2225 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2226 bounds_check(cp, index, CHECK_0); 2227 constantTag tag = cp->tag_at(index); 2228 if (!tag.is_int()) { 2229 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2230 } 2231 return cp->int_at(index); 2232 } 2233 JVM_END 2234 2235 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2236 { 2237 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2238 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2239 bounds_check(cp, index, CHECK_(0L)); 2240 constantTag tag = cp->tag_at(index); 2241 if (!tag.is_long()) { 2242 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2243 } 2244 return cp->long_at(index); 2245 } 2246 JVM_END 2247 2248 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2249 { 2250 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2251 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2252 bounds_check(cp, index, CHECK_(0.0f)); 2253 constantTag tag = cp->tag_at(index); 2254 if (!tag.is_float()) { 2255 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2256 } 2257 return cp->float_at(index); 2258 } 2259 JVM_END 2260 2261 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2262 { 2263 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2264 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2265 bounds_check(cp, index, CHECK_(0.0)); 2266 constantTag tag = cp->tag_at(index); 2267 if (!tag.is_double()) { 2268 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2269 } 2270 return cp->double_at(index); 2271 } 2272 JVM_END 2273 2274 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2275 { 2276 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2277 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2278 bounds_check(cp, index, CHECK_NULL); 2279 constantTag tag = cp->tag_at(index); 2280 if (!tag.is_string()) { 2281 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2282 } 2283 oop str = cp->string_at(index, CHECK_NULL); 2284 return (jstring) JNIHandles::make_local(str); 2285 } 2286 JVM_END 2287 2288 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2289 { 2290 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2291 JvmtiVMObjectAllocEventCollector oam; 2292 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2293 bounds_check(cp, index, CHECK_NULL); 2294 constantTag tag = cp->tag_at(index); 2295 if (!tag.is_symbol()) { 2296 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2297 } 2298 Symbol* sym = cp->symbol_at(index); 2299 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2300 return (jstring) JNIHandles::make_local(str()); 2301 } 2302 JVM_END 2303 2304 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2305 { 2306 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2307 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2308 bounds_check(cp, index, CHECK_0); 2309 constantTag tag = cp->tag_at(index); 2310 jbyte result = tag.value(); 2311 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2312 // they are changed to the corresponding tags from the JVM spec, so that java code in 2313 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2314 if (tag.is_klass_or_reference()) { 2315 result = JVM_CONSTANT_Class; 2316 } else if (tag.is_string_index()) { 2317 result = JVM_CONSTANT_String; 2318 } else if (tag.is_method_type_in_error()) { 2319 result = JVM_CONSTANT_MethodType; 2320 } else if (tag.is_method_handle_in_error()) { 2321 result = JVM_CONSTANT_MethodHandle; 2322 } else if (tag.is_dynamic_constant_in_error()) { 2323 result = JVM_CONSTANT_Dynamic; 2324 } 2325 return result; 2326 } 2327 JVM_END 2328 2329 // Assertion support. ////////////////////////////////////////////////////////// 2330 2331 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2332 JVMWrapper("JVM_DesiredAssertionStatus"); 2333 assert(cls != NULL, "bad class"); 2334 2335 oop r = JNIHandles::resolve(cls); 2336 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2337 if (java_lang_Class::is_primitive(r)) return false; 2338 2339 Klass* k = java_lang_Class::as_Klass(r); 2340 assert(k->is_instance_klass(), "must be an instance klass"); 2341 if (!k->is_instance_klass()) return false; 2342 2343 ResourceMark rm(THREAD); 2344 const char* name = k->name()->as_C_string(); 2345 bool system_class = k->class_loader() == NULL; 2346 return JavaAssertions::enabled(name, system_class); 2347 2348 JVM_END 2349 2350 2351 // Return a new AssertionStatusDirectives object with the fields filled in with 2352 // command-line assertion arguments (i.e., -ea, -da). 2353 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2354 JVMWrapper("JVM_AssertionStatusDirectives"); 2355 JvmtiVMObjectAllocEventCollector oam; 2356 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2357 return JNIHandles::make_local(env, asd); 2358 JVM_END 2359 2360 // Verification //////////////////////////////////////////////////////////////////////////////// 2361 2362 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2363 2364 // RedefineClasses support: bug 6214132 caused verification to fail. 2365 // All functions from this section should call the jvmtiThreadSate function: 2366 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2367 // The function returns a Klass* of the _scratch_class if the verifier 2368 // was invoked in the middle of the class redefinition. 2369 // Otherwise it returns its argument value which is the _the_class Klass*. 2370 // Please, refer to the description in the jvmtiThreadSate.hpp. 2371 2372 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2373 JVMWrapper("JVM_GetClassNameUTF"); 2374 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2375 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2376 return k->name()->as_utf8(); 2377 JVM_END 2378 2379 2380 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2381 JVMWrapper("JVM_GetClassCPTypes"); 2382 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2383 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2384 // types will have length zero if this is not an InstanceKlass 2385 // (length is determined by call to JVM_GetClassCPEntriesCount) 2386 if (k->is_instance_klass()) { 2387 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2388 for (int index = cp->length() - 1; index >= 0; index--) { 2389 constantTag tag = cp->tag_at(index); 2390 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2391 } 2392 } 2393 JVM_END 2394 2395 2396 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2397 JVMWrapper("JVM_GetClassCPEntriesCount"); 2398 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2399 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2400 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2401 JVM_END 2402 2403 2404 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2405 JVMWrapper("JVM_GetClassFieldsCount"); 2406 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2407 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2408 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2409 JVM_END 2410 2411 2412 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2413 JVMWrapper("JVM_GetClassMethodsCount"); 2414 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2415 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2416 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2417 JVM_END 2418 2419 2420 // The following methods, used for the verifier, are never called with 2421 // array klasses, so a direct cast to InstanceKlass is safe. 2422 // Typically, these methods are called in a loop with bounds determined 2423 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2424 // zero for arrays. 2425 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2426 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2427 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2428 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2429 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2430 int length = method->checked_exceptions_length(); 2431 if (length > 0) { 2432 CheckedExceptionElement* table= method->checked_exceptions_start(); 2433 for (int i = 0; i < length; i++) { 2434 exceptions[i] = table[i].class_cp_index; 2435 } 2436 } 2437 JVM_END 2438 2439 2440 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2441 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2442 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2443 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2444 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2445 return method->checked_exceptions_length(); 2446 JVM_END 2447 2448 2449 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2450 JVMWrapper("JVM_GetMethodIxByteCode"); 2451 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2452 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2453 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2454 memcpy(code, method->code_base(), method->code_size()); 2455 JVM_END 2456 2457 2458 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2459 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2460 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2461 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2462 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2463 return method->code_size(); 2464 JVM_END 2465 2466 2467 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2468 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2469 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2470 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2471 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2472 ExceptionTable extable(method); 2473 entry->start_pc = extable.start_pc(entry_index); 2474 entry->end_pc = extable.end_pc(entry_index); 2475 entry->handler_pc = extable.handler_pc(entry_index); 2476 entry->catchType = extable.catch_type_index(entry_index); 2477 JVM_END 2478 2479 2480 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2481 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2482 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2483 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2484 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2485 return method->exception_table_length(); 2486 JVM_END 2487 2488 2489 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2490 JVMWrapper("JVM_GetMethodIxModifiers"); 2491 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2492 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2493 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2494 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2495 JVM_END 2496 2497 2498 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2499 JVMWrapper("JVM_GetFieldIxModifiers"); 2500 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2501 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2502 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2503 JVM_END 2504 2505 2506 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2507 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2508 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2509 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2510 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2511 return method->max_locals(); 2512 JVM_END 2513 2514 2515 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2516 JVMWrapper("JVM_GetMethodIxArgsSize"); 2517 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2518 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2519 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2520 return method->size_of_parameters(); 2521 JVM_END 2522 2523 2524 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2525 JVMWrapper("JVM_GetMethodIxMaxStack"); 2526 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2527 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2528 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2529 return method->verifier_max_stack(); 2530 JVM_END 2531 2532 2533 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2534 JVMWrapper("JVM_IsConstructorIx"); 2535 ResourceMark rm(THREAD); 2536 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2537 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2538 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2539 return method->name() == vmSymbols::object_initializer_name(); 2540 JVM_END 2541 2542 2543 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2544 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2545 ResourceMark rm(THREAD); 2546 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2547 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2548 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2549 return method->is_overpass(); 2550 JVM_END 2551 2552 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2553 JVMWrapper("JVM_GetMethodIxIxUTF"); 2554 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2555 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2556 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2557 return method->name()->as_utf8(); 2558 JVM_END 2559 2560 2561 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2562 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2563 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2564 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2565 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2566 return method->signature()->as_utf8(); 2567 JVM_END 2568 2569 /** 2570 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2571 * read entries in the constant pool. Since the old verifier always 2572 * works on a copy of the code, it will not see any rewriting that 2573 * may possibly occur in the middle of verification. So it is important 2574 * that nothing it calls tries to use the cpCache instead of the raw 2575 * constant pool, so we must use cp->uncached_x methods when appropriate. 2576 */ 2577 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2578 JVMWrapper("JVM_GetCPFieldNameUTF"); 2579 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2580 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2581 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2582 switch (cp->tag_at(cp_index).value()) { 2583 case JVM_CONSTANT_Fieldref: 2584 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2585 default: 2586 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2587 } 2588 ShouldNotReachHere(); 2589 return NULL; 2590 JVM_END 2591 2592 2593 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2594 JVMWrapper("JVM_GetCPMethodNameUTF"); 2595 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2596 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2597 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2598 switch (cp->tag_at(cp_index).value()) { 2599 case JVM_CONSTANT_InterfaceMethodref: 2600 case JVM_CONSTANT_Methodref: 2601 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2602 default: 2603 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2604 } 2605 ShouldNotReachHere(); 2606 return NULL; 2607 JVM_END 2608 2609 2610 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2611 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2612 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2613 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2614 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2615 switch (cp->tag_at(cp_index).value()) { 2616 case JVM_CONSTANT_InterfaceMethodref: 2617 case JVM_CONSTANT_Methodref: 2618 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2619 default: 2620 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2621 } 2622 ShouldNotReachHere(); 2623 return NULL; 2624 JVM_END 2625 2626 2627 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2628 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2629 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2630 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2631 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2632 switch (cp->tag_at(cp_index).value()) { 2633 case JVM_CONSTANT_Fieldref: 2634 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2635 default: 2636 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2637 } 2638 ShouldNotReachHere(); 2639 return NULL; 2640 JVM_END 2641 2642 2643 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2644 JVMWrapper("JVM_GetCPClassNameUTF"); 2645 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2646 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2647 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2648 Symbol* classname = cp->klass_name_at(cp_index); 2649 return classname->as_utf8(); 2650 JVM_END 2651 2652 2653 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2654 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2655 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2656 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2657 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2658 switch (cp->tag_at(cp_index).value()) { 2659 case JVM_CONSTANT_Fieldref: { 2660 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2661 Symbol* classname = cp->klass_name_at(class_index); 2662 return classname->as_utf8(); 2663 } 2664 default: 2665 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2666 } 2667 ShouldNotReachHere(); 2668 return NULL; 2669 JVM_END 2670 2671 2672 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2673 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2674 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2675 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2676 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2677 switch (cp->tag_at(cp_index).value()) { 2678 case JVM_CONSTANT_Methodref: 2679 case JVM_CONSTANT_InterfaceMethodref: { 2680 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2681 Symbol* classname = cp->klass_name_at(class_index); 2682 return classname->as_utf8(); 2683 } 2684 default: 2685 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2686 } 2687 ShouldNotReachHere(); 2688 return NULL; 2689 JVM_END 2690 2691 2692 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2693 JVMWrapper("JVM_GetCPFieldModifiers"); 2694 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2695 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2696 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2697 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2698 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2699 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2700 switch (cp->tag_at(cp_index).value()) { 2701 case JVM_CONSTANT_Fieldref: { 2702 Symbol* name = cp->uncached_name_ref_at(cp_index); 2703 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2704 InstanceKlass* ik = InstanceKlass::cast(k_called); 2705 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2706 if (fs.name() == name && fs.signature() == signature) { 2707 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2708 } 2709 } 2710 return -1; 2711 } 2712 default: 2713 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2714 } 2715 ShouldNotReachHere(); 2716 return 0; 2717 JVM_END 2718 2719 2720 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2721 JVMWrapper("JVM_GetCPMethodModifiers"); 2722 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2723 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2724 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2725 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2726 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2727 switch (cp->tag_at(cp_index).value()) { 2728 case JVM_CONSTANT_Methodref: 2729 case JVM_CONSTANT_InterfaceMethodref: { 2730 Symbol* name = cp->uncached_name_ref_at(cp_index); 2731 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2732 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2733 int methods_count = methods->length(); 2734 for (int i = 0; i < methods_count; i++) { 2735 Method* method = methods->at(i); 2736 if (method->name() == name && method->signature() == signature) { 2737 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2738 } 2739 } 2740 return -1; 2741 } 2742 default: 2743 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2744 } 2745 ShouldNotReachHere(); 2746 return 0; 2747 JVM_END 2748 2749 2750 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2751 2752 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2753 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2754 JVM_END 2755 2756 2757 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2758 JVMWrapper("JVM_IsSameClassPackage"); 2759 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2760 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2761 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2762 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2763 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2764 JVM_END 2765 2766 // Printing support ////////////////////////////////////////////////// 2767 extern "C" { 2768 2769 ATTRIBUTE_PRINTF(3, 0) 2770 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2771 // Reject count values that are negative signed values converted to 2772 // unsigned; see bug 4399518, 4417214 2773 if ((intptr_t)count <= 0) return -1; 2774 2775 int result = os::vsnprintf(str, count, fmt, args); 2776 if (result > 0 && (size_t)result >= count) { 2777 result = -1; 2778 } 2779 2780 return result; 2781 } 2782 2783 ATTRIBUTE_PRINTF(3, 4) 2784 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2785 va_list args; 2786 int len; 2787 va_start(args, fmt); 2788 len = jio_vsnprintf(str, count, fmt, args); 2789 va_end(args); 2790 return len; 2791 } 2792 2793 ATTRIBUTE_PRINTF(2, 3) 2794 int jio_fprintf(FILE* f, const char *fmt, ...) { 2795 int len; 2796 va_list args; 2797 va_start(args, fmt); 2798 len = jio_vfprintf(f, fmt, args); 2799 va_end(args); 2800 return len; 2801 } 2802 2803 ATTRIBUTE_PRINTF(2, 0) 2804 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2805 if (Arguments::vfprintf_hook() != NULL) { 2806 return Arguments::vfprintf_hook()(f, fmt, args); 2807 } else { 2808 return vfprintf(f, fmt, args); 2809 } 2810 } 2811 2812 ATTRIBUTE_PRINTF(1, 2) 2813 JNIEXPORT int jio_printf(const char *fmt, ...) { 2814 int len; 2815 va_list args; 2816 va_start(args, fmt); 2817 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2818 va_end(args); 2819 return len; 2820 } 2821 2822 // HotSpot specific jio method 2823 void jio_print(const char* s, size_t len) { 2824 // Try to make this function as atomic as possible. 2825 if (Arguments::vfprintf_hook() != NULL) { 2826 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2827 } else { 2828 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2829 size_t count = ::write(defaultStream::output_fd(), s, (int)len); 2830 } 2831 } 2832 2833 } // Extern C 2834 2835 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2836 2837 // In most of the JVM thread support functions we need to access the 2838 // thread through a ThreadsListHandle to prevent it from exiting and 2839 // being reclaimed while we try to operate on it. The exceptions to this 2840 // rule are when operating on the current thread, or if the monitor of 2841 // the target java.lang.Thread is locked at the Java level - in both 2842 // cases the target cannot exit. 2843 2844 static void thread_entry(JavaThread* thread, TRAPS) { 2845 HandleMark hm(THREAD); 2846 Handle obj(THREAD, thread->threadObj()); 2847 JavaValue result(T_VOID); 2848 JavaCalls::call_virtual(&result, 2849 obj, 2850 SystemDictionary::Thread_klass(), 2851 vmSymbols::run_method_name(), 2852 vmSymbols::void_method_signature(), 2853 THREAD); 2854 } 2855 2856 2857 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2858 JVMWrapper("JVM_StartThread"); 2859 JavaThread *native_thread = NULL; 2860 2861 // We cannot hold the Threads_lock when we throw an exception, 2862 // due to rank ordering issues. Example: we might need to grab the 2863 // Heap_lock while we construct the exception. 2864 bool throw_illegal_thread_state = false; 2865 2866 // We must release the Threads_lock before we can post a jvmti event 2867 // in Thread::start. 2868 { 2869 // Ensure that the C++ Thread and OSThread structures aren't freed before 2870 // we operate. 2871 MutexLocker mu(Threads_lock); 2872 2873 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2874 // re-starting an already started thread, so we should usually find 2875 // that the JavaThread is null. However for a JNI attached thread 2876 // there is a small window between the Thread object being created 2877 // (with its JavaThread set) and the update to its threadStatus, so we 2878 // have to check for this 2879 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2880 throw_illegal_thread_state = true; 2881 } else { 2882 // We could also check the stillborn flag to see if this thread was already stopped, but 2883 // for historical reasons we let the thread detect that itself when it starts running 2884 2885 jlong size = 2886 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2887 // Allocate the C++ Thread structure and create the native thread. The 2888 // stack size retrieved from java is 64-bit signed, but the constructor takes 2889 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2890 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2891 // - Avoid passing negative values which would result in really large stacks. 2892 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2893 size_t sz = size > 0 ? (size_t) size : 0; 2894 native_thread = new JavaThread(&thread_entry, sz); 2895 2896 // At this point it may be possible that no osthread was created for the 2897 // JavaThread due to lack of memory. Check for this situation and throw 2898 // an exception if necessary. Eventually we may want to change this so 2899 // that we only grab the lock if the thread was created successfully - 2900 // then we can also do this check and throw the exception in the 2901 // JavaThread constructor. 2902 if (native_thread->osthread() != NULL) { 2903 // Note: the current thread is not being used within "prepare". 2904 native_thread->prepare(jthread); 2905 } 2906 } 2907 } 2908 2909 if (throw_illegal_thread_state) { 2910 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2911 } 2912 2913 assert(native_thread != NULL, "Starting null thread?"); 2914 2915 if (native_thread->osthread() == NULL) { 2916 // No one should hold a reference to the 'native_thread'. 2917 native_thread->smr_delete(); 2918 if (JvmtiExport::should_post_resource_exhausted()) { 2919 JvmtiExport::post_resource_exhausted( 2920 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2921 os::native_thread_creation_failed_msg()); 2922 } 2923 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2924 os::native_thread_creation_failed_msg()); 2925 } 2926 2927 Thread::start(native_thread); 2928 2929 JVM_END 2930 2931 2932 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2933 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2934 // but is thought to be reliable and simple. In the case, where the receiver is the 2935 // same thread as the sender, no VM_Operation is needed. 2936 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2937 JVMWrapper("JVM_StopThread"); 2938 2939 // A nested ThreadsListHandle will grab the Threads_lock so create 2940 // tlh before we resolve throwable. 2941 ThreadsListHandle tlh(thread); 2942 oop java_throwable = JNIHandles::resolve(throwable); 2943 if (java_throwable == NULL) { 2944 THROW(vmSymbols::java_lang_NullPointerException()); 2945 } 2946 oop java_thread = NULL; 2947 JavaThread* receiver = NULL; 2948 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2949 Events::log_exception(thread, 2950 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2951 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2952 2953 if (is_alive) { 2954 // jthread refers to a live JavaThread. 2955 if (thread == receiver) { 2956 // Exception is getting thrown at self so no VM_Operation needed. 2957 THROW_OOP(java_throwable); 2958 } else { 2959 // Use a VM_Operation to throw the exception. 2960 Thread::send_async_exception(java_thread, java_throwable); 2961 } 2962 } else { 2963 // Either: 2964 // - target thread has not been started before being stopped, or 2965 // - target thread already terminated 2966 // We could read the threadStatus to determine which case it is 2967 // but that is overkill as it doesn't matter. We must set the 2968 // stillborn flag for the first case, and if the thread has already 2969 // exited setting this flag has no effect. 2970 java_lang_Thread::set_stillborn(java_thread); 2971 } 2972 JVM_END 2973 2974 2975 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2976 JVMWrapper("JVM_IsThreadAlive"); 2977 2978 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2979 return java_lang_Thread::is_alive(thread_oop); 2980 JVM_END 2981 2982 2983 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2984 JVMWrapper("JVM_SuspendThread"); 2985 2986 ThreadsListHandle tlh(thread); 2987 JavaThread* receiver = NULL; 2988 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2989 if (is_alive) { 2990 // jthread refers to a live JavaThread. 2991 { 2992 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2993 if (receiver->is_external_suspend()) { 2994 // Don't allow nested external suspend requests. We can't return 2995 // an error from this interface so just ignore the problem. 2996 return; 2997 } 2998 if (receiver->is_exiting()) { // thread is in the process of exiting 2999 return; 3000 } 3001 receiver->set_external_suspend(); 3002 } 3003 3004 // java_suspend() will catch threads in the process of exiting 3005 // and will ignore them. 3006 receiver->java_suspend(); 3007 3008 // It would be nice to have the following assertion in all the 3009 // time, but it is possible for a racing resume request to have 3010 // resumed this thread right after we suspended it. Temporarily 3011 // enable this assertion if you are chasing a different kind of 3012 // bug. 3013 // 3014 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 3015 // receiver->is_being_ext_suspended(), "thread is not suspended"); 3016 } 3017 JVM_END 3018 3019 3020 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 3021 JVMWrapper("JVM_ResumeThread"); 3022 3023 ThreadsListHandle tlh(thread); 3024 JavaThread* receiver = NULL; 3025 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3026 if (is_alive) { 3027 // jthread refers to a live JavaThread. 3028 3029 // This is the original comment for this Threads_lock grab: 3030 // We need to *always* get the threads lock here, since this operation cannot be allowed during 3031 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 3032 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 3033 // looks at it. 3034 // 3035 // The above comment dates back to when we had both internal and 3036 // external suspend APIs that shared a common underlying mechanism. 3037 // External suspend is now entirely cooperative and doesn't share 3038 // anything with internal suspend. That said, there are some 3039 // assumptions in the VM that an external resume grabs the 3040 // Threads_lock. We can't drop the Threads_lock grab here until we 3041 // resolve the assumptions that exist elsewhere. 3042 // 3043 MutexLocker ml(Threads_lock); 3044 receiver->java_resume(); 3045 } 3046 JVM_END 3047 3048 3049 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3050 JVMWrapper("JVM_SetThreadPriority"); 3051 3052 ThreadsListHandle tlh(thread); 3053 oop java_thread = NULL; 3054 JavaThread* receiver = NULL; 3055 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3056 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3057 3058 if (is_alive) { 3059 // jthread refers to a live JavaThread. 3060 Thread::set_priority(receiver, (ThreadPriority)prio); 3061 } 3062 // Implied else: If the JavaThread hasn't started yet, then the 3063 // priority set in the java.lang.Thread object above will be pushed 3064 // down when it does start. 3065 JVM_END 3066 3067 3068 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3069 JVMWrapper("JVM_Yield"); 3070 if (os::dont_yield()) return; 3071 HOTSPOT_THREAD_YIELD(); 3072 os::naked_yield(); 3073 JVM_END 3074 3075 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) { 3076 assert(event != NULL, "invariant"); 3077 assert(event->should_commit(), "invariant"); 3078 event->set_time(millis); 3079 event->commit(); 3080 } 3081 3082 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3083 JVMWrapper("JVM_Sleep"); 3084 3085 if (millis < 0) { 3086 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3087 } 3088 3089 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 3090 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3091 } 3092 3093 // Save current thread state and restore it at the end of this block. 3094 // And set new thread state to SLEEPING. 3095 JavaThreadSleepState jtss(thread); 3096 3097 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3098 EventThreadSleep event; 3099 3100 if (millis == 0) { 3101 os::naked_yield(); 3102 } else { 3103 ThreadState old_state = thread->osthread()->get_state(); 3104 thread->osthread()->set_state(SLEEPING); 3105 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3106 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3107 // us while we were sleeping. We do not overwrite those. 3108 if (!HAS_PENDING_EXCEPTION) { 3109 if (event.should_commit()) { 3110 post_thread_sleep_event(&event, millis); 3111 } 3112 HOTSPOT_THREAD_SLEEP_END(1); 3113 3114 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3115 // to properly restore the thread state. That's likely wrong. 3116 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3117 } 3118 } 3119 thread->osthread()->set_state(old_state); 3120 } 3121 if (event.should_commit()) { 3122 post_thread_sleep_event(&event, millis); 3123 } 3124 HOTSPOT_THREAD_SLEEP_END(0); 3125 JVM_END 3126 3127 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3128 JVMWrapper("JVM_CurrentThread"); 3129 oop jthread = thread->threadObj(); 3130 assert (thread != NULL, "no current thread!"); 3131 return JNIHandles::make_local(env, jthread); 3132 JVM_END 3133 3134 3135 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3136 JVMWrapper("JVM_CountStackFrames"); 3137 3138 uint32_t debug_bits = 0; 3139 ThreadsListHandle tlh(thread); 3140 JavaThread* receiver = NULL; 3141 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3142 int count = 0; 3143 if (is_alive) { 3144 // jthread refers to a live JavaThread. 3145 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) { 3146 // Count all java activation, i.e., number of vframes. 3147 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) { 3148 // Native frames are not counted. 3149 if (!vfst.method()->is_native()) count++; 3150 } 3151 } else { 3152 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3153 "this thread is not suspended"); 3154 } 3155 } 3156 // Implied else: if JavaThread is not alive simply return a count of 0. 3157 3158 return count; 3159 JVM_END 3160 3161 3162 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3163 JVMWrapper("JVM_Interrupt"); 3164 3165 ThreadsListHandle tlh(thread); 3166 JavaThread* receiver = NULL; 3167 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3168 if (is_alive) { 3169 // jthread refers to a live JavaThread. 3170 Thread::interrupt(receiver); 3171 } 3172 JVM_END 3173 3174 3175 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3176 JVMWrapper("JVM_IsInterrupted"); 3177 3178 ThreadsListHandle tlh(thread); 3179 JavaThread* receiver = NULL; 3180 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3181 if (is_alive) { 3182 // jthread refers to a live JavaThread. 3183 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0); 3184 } else { 3185 return JNI_FALSE; 3186 } 3187 JVM_END 3188 3189 3190 // Return true iff the current thread has locked the object passed in 3191 3192 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3193 JVMWrapper("JVM_HoldsLock"); 3194 assert(THREAD->is_Java_thread(), "sanity check"); 3195 if (obj == NULL) { 3196 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3197 } 3198 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3199 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3200 JVM_END 3201 3202 3203 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3204 JVMWrapper("JVM_DumpAllStacks"); 3205 VM_PrintThreads op; 3206 VMThread::execute(&op); 3207 if (JvmtiExport::should_post_data_dump()) { 3208 JvmtiExport::post_data_dump(); 3209 } 3210 JVM_END 3211 3212 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3213 JVMWrapper("JVM_SetNativeThreadName"); 3214 3215 // We don't use a ThreadsListHandle here because the current thread 3216 // must be alive. 3217 oop java_thread = JNIHandles::resolve_non_null(jthread); 3218 JavaThread* thr = java_lang_Thread::thread(java_thread); 3219 if (thread == thr && !thr->has_attached_via_jni()) { 3220 // Thread naming is only supported for the current thread and 3221 // we don't set the name of an attached thread to avoid stepping 3222 // on other programs. 3223 ResourceMark rm(thread); 3224 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3225 os::set_native_thread_name(thread_name); 3226 } 3227 JVM_END 3228 3229 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3230 3231 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3232 JVMWrapper("JVM_GetClassContext"); 3233 ResourceMark rm(THREAD); 3234 JvmtiVMObjectAllocEventCollector oam; 3235 vframeStream vfst(thread); 3236 3237 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3238 // This must only be called from SecurityManager.getClassContext 3239 Method* m = vfst.method(); 3240 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3241 m->name() == vmSymbols::getClassContext_name() && 3242 m->signature() == vmSymbols::void_class_array_signature())) { 3243 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3244 } 3245 } 3246 3247 // Collect method holders 3248 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3249 for (; !vfst.at_end(); vfst.security_next()) { 3250 Method* m = vfst.method(); 3251 // Native frames are not returned 3252 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3253 Klass* holder = m->method_holder(); 3254 assert(holder->is_klass(), "just checking"); 3255 klass_array->append(holder); 3256 } 3257 } 3258 3259 // Create result array of type [Ljava/lang/Class; 3260 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3261 // Fill in mirrors corresponding to method holders 3262 for (int i = 0; i < klass_array->length(); i++) { 3263 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3264 } 3265 3266 return (jobjectArray) JNIHandles::make_local(env, result); 3267 JVM_END 3268 3269 3270 // java.lang.Package //////////////////////////////////////////////////////////////// 3271 3272 3273 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3274 JVMWrapper("JVM_GetSystemPackage"); 3275 ResourceMark rm(THREAD); 3276 JvmtiVMObjectAllocEventCollector oam; 3277 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3278 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3279 return (jstring) JNIHandles::make_local(result); 3280 JVM_END 3281 3282 3283 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3284 JVMWrapper("JVM_GetSystemPackages"); 3285 JvmtiVMObjectAllocEventCollector oam; 3286 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3287 return (jobjectArray) JNIHandles::make_local(result); 3288 JVM_END 3289 3290 3291 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3292 3293 3294 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3295 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3296 3297 MonitorLockerEx ml(Heap_lock); 3298 oop ref = Universe::reference_pending_list(); 3299 if (ref != NULL) { 3300 Universe::set_reference_pending_list(NULL); 3301 } 3302 return JNIHandles::make_local(env, ref); 3303 JVM_END 3304 3305 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3306 JVMWrapper("JVM_HasReferencePendingList"); 3307 MonitorLockerEx ml(Heap_lock); 3308 return Universe::has_reference_pending_list(); 3309 JVM_END 3310 3311 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3312 JVMWrapper("JVM_WaitForReferencePendingList"); 3313 MonitorLockerEx ml(Heap_lock); 3314 while (!Universe::has_reference_pending_list()) { 3315 ml.wait(); 3316 } 3317 JVM_END 3318 3319 3320 // ObjectInputStream /////////////////////////////////////////////////////////////// 3321 3322 // Return the first user-defined class loader up the execution stack, or null 3323 // if only code from the bootstrap or platform class loader is on the stack. 3324 3325 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3326 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3327 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3328 oop loader = vfst.method()->method_holder()->class_loader(); 3329 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3330 return JNIHandles::make_local(env, loader); 3331 } 3332 } 3333 return NULL; 3334 JVM_END 3335 3336 3337 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3338 3339 3340 // resolve array handle and check arguments 3341 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3342 if (arr == NULL) { 3343 THROW_0(vmSymbols::java_lang_NullPointerException()); 3344 } 3345 oop a = JNIHandles::resolve_non_null(arr); 3346 if (!a->is_array()) { 3347 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3348 } else if (type_array_only && !a->is_typeArray()) { 3349 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3350 } 3351 return arrayOop(a); 3352 } 3353 3354 3355 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3356 JVMWrapper("JVM_GetArrayLength"); 3357 arrayOop a = check_array(env, arr, false, CHECK_0); 3358 return a->length(); 3359 JVM_END 3360 3361 3362 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3363 JVMWrapper("JVM_Array_Get"); 3364 JvmtiVMObjectAllocEventCollector oam; 3365 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3366 jvalue value; 3367 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3368 oop box = Reflection::box(&value, type, CHECK_NULL); 3369 return JNIHandles::make_local(env, box); 3370 JVM_END 3371 3372 3373 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3374 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3375 jvalue value; 3376 value.i = 0; // to initialize value before getting used in CHECK 3377 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3378 assert(a->is_typeArray(), "just checking"); 3379 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3380 BasicType wide_type = (BasicType) wCode; 3381 if (type != wide_type) { 3382 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3383 } 3384 return value; 3385 JVM_END 3386 3387 3388 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3389 JVMWrapper("JVM_SetArrayElement"); 3390 arrayOop a = check_array(env, arr, false, CHECK); 3391 oop box = JNIHandles::resolve(val); 3392 jvalue value; 3393 value.i = 0; // to initialize value before getting used in CHECK 3394 BasicType value_type; 3395 if (a->is_objArray()) { 3396 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3397 value_type = Reflection::unbox_for_regular_object(box, &value); 3398 } else { 3399 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3400 } 3401 Reflection::array_set(&value, a, index, value_type, CHECK); 3402 JVM_END 3403 3404 3405 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3406 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3407 arrayOop a = check_array(env, arr, true, CHECK); 3408 assert(a->is_typeArray(), "just checking"); 3409 BasicType value_type = (BasicType) vCode; 3410 Reflection::array_set(&v, a, index, value_type, CHECK); 3411 JVM_END 3412 3413 3414 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3415 JVMWrapper("JVM_NewArray"); 3416 JvmtiVMObjectAllocEventCollector oam; 3417 oop element_mirror = JNIHandles::resolve(eltClass); 3418 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3419 return JNIHandles::make_local(env, result); 3420 JVM_END 3421 3422 3423 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3424 JVMWrapper("JVM_NewMultiArray"); 3425 JvmtiVMObjectAllocEventCollector oam; 3426 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3427 oop element_mirror = JNIHandles::resolve(eltClass); 3428 assert(dim_array->is_typeArray(), "just checking"); 3429 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3430 return JNIHandles::make_local(env, result); 3431 JVM_END 3432 3433 3434 // Library support /////////////////////////////////////////////////////////////////////////// 3435 3436 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3437 //%note jvm_ct 3438 JVMWrapper("JVM_LoadLibrary"); 3439 char ebuf[1024]; 3440 void *load_result; 3441 { 3442 ThreadToNativeFromVM ttnfvm(thread); 3443 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3444 } 3445 if (load_result == NULL) { 3446 char msg[1024]; 3447 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3448 // Since 'ebuf' may contain a string encoded using 3449 // platform encoding scheme, we need to pass 3450 // Exceptions::unsafe_to_utf8 to the new_exception method 3451 // as the last argument. See bug 6367357. 3452 Handle h_exception = 3453 Exceptions::new_exception(thread, 3454 vmSymbols::java_lang_UnsatisfiedLinkError(), 3455 msg, Exceptions::unsafe_to_utf8); 3456 3457 THROW_HANDLE_0(h_exception); 3458 } 3459 return load_result; 3460 JVM_END 3461 3462 3463 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3464 JVMWrapper("JVM_UnloadLibrary"); 3465 os::dll_unload(handle); 3466 JVM_END 3467 3468 3469 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3470 JVMWrapper("JVM_FindLibraryEntry"); 3471 return os::dll_lookup(handle, name); 3472 JVM_END 3473 3474 3475 // JNI version /////////////////////////////////////////////////////////////////////////////// 3476 3477 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3478 JVMWrapper("JVM_IsSupportedJNIVersion"); 3479 return Threads::is_supported_jni_version_including_1_1(version); 3480 JVM_END 3481 3482 3483 // String support /////////////////////////////////////////////////////////////////////////// 3484 3485 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3486 JVMWrapper("JVM_InternString"); 3487 JvmtiVMObjectAllocEventCollector oam; 3488 if (str == NULL) return NULL; 3489 oop string = JNIHandles::resolve_non_null(str); 3490 oop result = StringTable::intern(string, CHECK_NULL); 3491 return (jstring) JNIHandles::make_local(env, result); 3492 JVM_END 3493 3494 3495 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3496 3497 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3498 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3499 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3500 // that only works with java threads. 3501 3502 3503 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3504 VM_Exit::block_if_vm_exited(); 3505 JVMWrapper("JVM_RawMonitorCreate"); 3506 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3507 } 3508 3509 3510 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3511 VM_Exit::block_if_vm_exited(); 3512 JVMWrapper("JVM_RawMonitorDestroy"); 3513 delete ((Mutex*) mon); 3514 } 3515 3516 3517 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3518 VM_Exit::block_if_vm_exited(); 3519 JVMWrapper("JVM_RawMonitorEnter"); 3520 ((Mutex*) mon)->jvm_raw_lock(); 3521 return 0; 3522 } 3523 3524 3525 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3526 VM_Exit::block_if_vm_exited(); 3527 JVMWrapper("JVM_RawMonitorExit"); 3528 ((Mutex*) mon)->jvm_raw_unlock(); 3529 } 3530 3531 3532 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3533 3534 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3535 Handle loader, Handle protection_domain, 3536 jboolean throwError, TRAPS) { 3537 // Security Note: 3538 // The Java level wrapper will perform the necessary security check allowing 3539 // us to pass the NULL as the initiating class loader. The VM is responsible for 3540 // the checkPackageAccess relative to the initiating class loader via the 3541 // protection_domain. The protection_domain is passed as NULL by the java code 3542 // if there is no security manager in 3-arg Class.forName(). 3543 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3544 3545 // Check if we should initialize the class 3546 if (init && klass->is_instance_klass()) { 3547 klass->initialize(CHECK_NULL); 3548 } 3549 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3550 } 3551 3552 3553 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3554 3555 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3556 JVMWrapper("JVM_InvokeMethod"); 3557 Handle method_handle; 3558 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3559 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3560 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3561 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3562 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3563 jobject res = JNIHandles::make_local(env, result); 3564 if (JvmtiExport::should_post_vm_object_alloc()) { 3565 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3566 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3567 if (java_lang_Class::is_primitive(ret_type)) { 3568 // Only for primitive type vm allocates memory for java object. 3569 // See box() method. 3570 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3571 } 3572 } 3573 return res; 3574 } else { 3575 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3576 } 3577 JVM_END 3578 3579 3580 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3581 JVMWrapper("JVM_NewInstanceFromConstructor"); 3582 oop constructor_mirror = JNIHandles::resolve(c); 3583 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3584 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3585 jobject res = JNIHandles::make_local(env, result); 3586 if (JvmtiExport::should_post_vm_object_alloc()) { 3587 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3588 } 3589 return res; 3590 JVM_END 3591 3592 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3593 3594 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3595 JVMWrapper("JVM_SupportsCX8"); 3596 return VM_Version::supports_cx8(); 3597 JVM_END 3598 3599 // Returns an array of all live Thread objects (VM internal JavaThreads, 3600 // jvmti agent threads, and JNI attaching threads are skipped) 3601 // See CR 6404306 regarding JNI attaching threads 3602 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3603 ResourceMark rm(THREAD); 3604 ThreadsListEnumerator tle(THREAD, false, false); 3605 JvmtiVMObjectAllocEventCollector oam; 3606 3607 int num_threads = tle.num_threads(); 3608 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3609 objArrayHandle threads_ah(THREAD, r); 3610 3611 for (int i = 0; i < num_threads; i++) { 3612 Handle h = tle.get_threadObj(i); 3613 threads_ah->obj_at_put(i, h()); 3614 } 3615 3616 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3617 JVM_END 3618 3619 3620 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3621 // Return StackTraceElement[][], each element is the stack trace of a thread in 3622 // the corresponding entry in the given threads array 3623 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3624 JVMWrapper("JVM_DumpThreads"); 3625 JvmtiVMObjectAllocEventCollector oam; 3626 3627 // Check if threads is null 3628 if (threads == NULL) { 3629 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3630 } 3631 3632 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3633 objArrayHandle ah(THREAD, a); 3634 int num_threads = ah->length(); 3635 // check if threads is non-empty array 3636 if (num_threads == 0) { 3637 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3638 } 3639 3640 // check if threads is not an array of objects of Thread class 3641 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3642 if (k != SystemDictionary::Thread_klass()) { 3643 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3644 } 3645 3646 ResourceMark rm(THREAD); 3647 3648 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3649 for (int i = 0; i < num_threads; i++) { 3650 oop thread_obj = ah->obj_at(i); 3651 instanceHandle h(THREAD, (instanceOop) thread_obj); 3652 thread_handle_array->append(h); 3653 } 3654 3655 // The JavaThread references in thread_handle_array are validated 3656 // in VM_ThreadDump::doit(). 3657 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3658 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3659 3660 JVM_END 3661 3662 // JVM monitoring and management support 3663 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3664 return Management::get_jmm_interface(version); 3665 JVM_END 3666 3667 // com.sun.tools.attach.VirtualMachine agent properties support 3668 // 3669 // Initialize the agent properties with the properties maintained in the VM 3670 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3671 JVMWrapper("JVM_InitAgentProperties"); 3672 ResourceMark rm; 3673 3674 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3675 3676 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3677 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3678 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3679 return properties; 3680 JVM_END 3681 3682 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3683 { 3684 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3685 JvmtiVMObjectAllocEventCollector oam; 3686 3687 if (ofClass == NULL) { 3688 return NULL; 3689 } 3690 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3691 // Special handling for primitive objects 3692 if (java_lang_Class::is_primitive(mirror())) { 3693 return NULL; 3694 } 3695 Klass* k = java_lang_Class::as_Klass(mirror()); 3696 if (!k->is_instance_klass()) { 3697 return NULL; 3698 } 3699 InstanceKlass* ik = InstanceKlass::cast(k); 3700 int encl_method_class_idx = ik->enclosing_method_class_index(); 3701 if (encl_method_class_idx == 0) { 3702 return NULL; 3703 } 3704 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3705 objArrayHandle dest(THREAD, dest_o); 3706 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3707 dest->obj_at_put(0, enc_k->java_mirror()); 3708 int encl_method_method_idx = ik->enclosing_method_method_index(); 3709 if (encl_method_method_idx != 0) { 3710 Symbol* sym = ik->constants()->symbol_at( 3711 extract_low_short_from_int( 3712 ik->constants()->name_and_type_at(encl_method_method_idx))); 3713 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3714 dest->obj_at_put(1, str()); 3715 sym = ik->constants()->symbol_at( 3716 extract_high_short_from_int( 3717 ik->constants()->name_and_type_at(encl_method_method_idx))); 3718 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3719 dest->obj_at_put(2, str()); 3720 } 3721 return (jobjectArray) JNIHandles::make_local(dest()); 3722 } 3723 JVM_END 3724 3725 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3726 { 3727 memset(info, 0, info_size); 3728 3729 info->jvm_version = Abstract_VM_Version::jvm_version(); 3730 info->patch_version = Abstract_VM_Version::vm_patch_version(); 3731 3732 // when we add a new capability in the jvm_version_info struct, we should also 3733 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3734 // counter defined in runtimeService.cpp. 3735 info->is_attach_supported = AttachListener::is_attach_supported(); 3736 } 3737 JVM_END 3738 3739 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3740 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3741 ResourceMark rm(THREAD); 3742 3743 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3744 return NULL; 3745 } 3746 3747 char** vm_flags = Arguments::jvm_flags_array(); 3748 char** vm_args = Arguments::jvm_args_array(); 3749 int num_flags = Arguments::num_jvm_flags(); 3750 int num_args = Arguments::num_jvm_args(); 3751 3752 InstanceKlass* ik = SystemDictionary::String_klass(); 3753 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3754 objArrayHandle result_h(THREAD, r); 3755 3756 int index = 0; 3757 for (int j = 0; j < num_flags; j++, index++) { 3758 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3759 result_h->obj_at_put(index, h()); 3760 } 3761 for (int i = 0; i < num_args; i++, index++) { 3762 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3763 result_h->obj_at_put(index, h()); 3764 } 3765 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3766 JVM_END 3767 3768 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3769 return os::get_signal_number(name); 3770 JVM_END