1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classFileStream.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/classLoaderData.inline.hpp" 29 #include "classfile/javaAssertions.hpp" 30 #include "classfile/javaClasses.inline.hpp" 31 #include "classfile/moduleEntry.hpp" 32 #include "classfile/modules.hpp" 33 #include "classfile/packageEntry.hpp" 34 #include "classfile/stringTable.hpp" 35 #include "classfile/systemDictionary.hpp" 36 #include "classfile/vmSymbols.hpp" 37 #include "gc/shared/barrierSet.inline.hpp" 38 #include "gc/shared/collectedHeap.inline.hpp" 39 #include "interpreter/bytecode.hpp" 40 #include "memory/oopFactory.hpp" 41 #include "memory/resourceArea.hpp" 42 #include "memory/universe.inline.hpp" 43 #include "oops/fieldStreams.hpp" 44 #include "oops/instanceKlass.hpp" 45 #include "oops/method.hpp" 46 #include "oops/objArrayKlass.hpp" 47 #include "oops/objArrayOop.inline.hpp" 48 #include "oops/oop.inline.hpp" 49 #include "prims/jvm.h" 50 #include "prims/jvm_misc.hpp" 51 #include "prims/jvmtiExport.hpp" 52 #include "prims/jvmtiThreadState.hpp" 53 #include "prims/nativeLookup.hpp" 54 #include "prims/privilegedStack.hpp" 55 #include "prims/stackwalk.hpp" 56 #include "runtime/arguments.hpp" 57 #include "runtime/atomic.hpp" 58 #include "runtime/handles.inline.hpp" 59 #include "runtime/init.hpp" 60 #include "runtime/interfaceSupport.hpp" 61 #include "runtime/java.hpp" 62 #include "runtime/javaCalls.hpp" 63 #include "runtime/jfieldIDWorkaround.hpp" 64 #include "runtime/orderAccess.inline.hpp" 65 #include "runtime/os.inline.hpp" 66 #include "runtime/perfData.hpp" 67 #include "runtime/reflection.hpp" 68 #include "runtime/thread.inline.hpp" 69 #include "runtime/threadSMR.hpp" 70 #include "runtime/vframe.hpp" 71 #include "runtime/vm_operations.hpp" 72 #include "runtime/vm_version.hpp" 73 #include "services/attachListener.hpp" 74 #include "services/management.hpp" 75 #include "services/threadService.hpp" 76 #include "trace/tracing.hpp" 77 #include "utilities/copy.hpp" 78 #include "utilities/defaultStream.hpp" 79 #include "utilities/dtrace.hpp" 80 #include "utilities/events.hpp" 81 #include "utilities/histogram.hpp" 82 #include "utilities/macros.hpp" 83 #include "utilities/utf8.hpp" 84 #if INCLUDE_CDS 85 #include "classfile/sharedClassUtil.hpp" 86 #include "classfile/systemDictionaryShared.hpp" 87 #endif 88 89 #include <errno.h> 90 91 /* 92 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 93 such ctors and calls MUST NOT come between an oop declaration/init and its 94 usage because if objects are move this may cause various memory stomps, bus 95 errors and segfaults. Here is a cookbook for causing so called "naked oop 96 failures": 97 98 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 99 JVMWrapper("JVM_GetClassDeclaredFields"); 100 101 // Object address to be held directly in mirror & not visible to GC 102 oop mirror = JNIHandles::resolve_non_null(ofClass); 103 104 // If this ctor can hit a safepoint, moving objects around, then 105 ComplexConstructor foo; 106 107 // Boom! mirror may point to JUNK instead of the intended object 108 (some dereference of mirror) 109 110 // Here's another call that may block for GC, making mirror stale 111 MutexLocker ml(some_lock); 112 113 // And here's an initializer that can result in a stale oop 114 // all in one step. 115 oop o = call_that_can_throw_exception(TRAPS); 116 117 118 The solution is to keep the oop declaration BELOW the ctor or function 119 call that might cause a GC, do another resolve to reassign the oop, or 120 consider use of a Handle instead of an oop so there is immunity from object 121 motion. But note that the "QUICK" entries below do not have a handlemark 122 and thus can only support use of handles passed in. 123 */ 124 125 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 126 ResourceMark rm; 127 int line_number = -1; 128 const char * source_file = NULL; 129 const char * trace = "explicit"; 130 InstanceKlass* caller = NULL; 131 JavaThread* jthread = JavaThread::current(); 132 if (jthread->has_last_Java_frame()) { 133 vframeStream vfst(jthread); 134 135 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 136 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 137 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 138 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 139 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 140 141 Method* last_caller = NULL; 142 143 while (!vfst.at_end()) { 144 Method* m = vfst.method(); 145 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 146 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 147 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 148 break; 149 } 150 last_caller = m; 151 vfst.next(); 152 } 153 // if this is called from Class.forName0 and that is called from Class.forName, 154 // then print the caller of Class.forName. If this is Class.loadClass, then print 155 // that caller, otherwise keep quiet since this should be picked up elsewhere. 156 bool found_it = false; 157 if (!vfst.at_end() && 158 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 159 vfst.method()->name() == vmSymbols::forName0_name()) { 160 vfst.next(); 161 if (!vfst.at_end() && 162 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 163 vfst.method()->name() == vmSymbols::forName_name()) { 164 vfst.next(); 165 found_it = true; 166 } 167 } else if (last_caller != NULL && 168 last_caller->method_holder()->name() == 169 vmSymbols::java_lang_ClassLoader() && 170 (last_caller->name() == vmSymbols::loadClassInternal_name() || 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 jint 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_Halt(jint code)) 439 before_exit(thread); 440 vm_exit(code); 441 JVM_END 442 443 444 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 445 JVMWrapper("JVM_GC"); 446 if (!DisableExplicitGC) { 447 Universe::heap()->collect(GCCause::_java_lang_system_gc); 448 } 449 JVM_END 450 451 452 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 453 JVMWrapper("JVM_MaxObjectInspectionAge"); 454 return Universe::heap()->millis_since_last_gc(); 455 JVM_END 456 457 458 static inline jlong convert_size_t_to_jlong(size_t val) { 459 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 460 NOT_LP64 (return (jlong)val;) 461 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 462 } 463 464 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 465 JVMWrapper("JVM_TotalMemory"); 466 size_t n = Universe::heap()->capacity(); 467 return convert_size_t_to_jlong(n); 468 JVM_END 469 470 471 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 472 JVMWrapper("JVM_FreeMemory"); 473 CollectedHeap* ch = Universe::heap(); 474 size_t n; 475 { 476 MutexLocker x(Heap_lock); 477 n = ch->capacity() - ch->used(); 478 } 479 return convert_size_t_to_jlong(n); 480 JVM_END 481 482 483 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 484 JVMWrapper("JVM_MaxMemory"); 485 size_t n = Universe::heap()->max_capacity(); 486 return convert_size_t_to_jlong(n); 487 JVM_END 488 489 490 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 491 JVMWrapper("JVM_ActiveProcessorCount"); 492 return os::active_processor_count(); 493 JVM_END 494 495 496 497 // java.lang.Throwable ////////////////////////////////////////////////////// 498 499 500 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 501 JVMWrapper("JVM_FillInStackTrace"); 502 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 503 java_lang_Throwable::fill_in_stack_trace(exception); 504 JVM_END 505 506 507 // java.lang.StackTraceElement ////////////////////////////////////////////// 508 509 510 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 511 JVMWrapper("JVM_InitStackTraceElementArray"); 512 Handle exception(THREAD, JNIHandles::resolve(throwable)); 513 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 514 objArrayHandle stack_trace(THREAD, st); 515 // Fill in the allocated stack trace 516 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 517 JVM_END 518 519 520 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 521 JVMWrapper("JVM_InitStackTraceElement"); 522 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 523 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 524 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 525 JVM_END 526 527 528 // java.lang.StackWalker ////////////////////////////////////////////////////// 529 530 531 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 532 jint skip_frames, jint frame_count, jint start_index, 533 jobjectArray frames)) 534 JVMWrapper("JVM_CallStackWalk"); 535 JavaThread* jt = (JavaThread*) THREAD; 536 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 537 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 538 } 539 540 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 541 542 // frames array is a Class<?>[] array when only getting caller reference, 543 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 544 // be null. 545 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 546 objArrayHandle frames_array_h(THREAD, fa); 547 548 int limit = start_index + frame_count; 549 if (frames_array_h->length() < limit) { 550 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 551 } 552 553 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 554 start_index, frames_array_h, CHECK_NULL); 555 return JNIHandles::make_local(env, result); 556 JVM_END 557 558 559 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 560 jint frame_count, jint start_index, 561 jobjectArray frames)) 562 JVMWrapper("JVM_MoreStackWalk"); 563 JavaThread* jt = (JavaThread*) THREAD; 564 565 // frames array is a Class<?>[] array when only getting caller reference, 566 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 567 // be null. 568 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 569 objArrayHandle frames_array_h(THREAD, fa); 570 571 int limit = start_index+frame_count; 572 if (frames_array_h->length() < limit) { 573 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 574 } 575 576 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 577 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 578 start_index, frames_array_h, THREAD); 579 JVM_END 580 581 // java.lang.Object /////////////////////////////////////////////// 582 583 584 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 585 JVMWrapper("JVM_IHashCode"); 586 // as implemented in the classic virtual machine; return 0 if object is NULL 587 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 588 JVM_END 589 590 591 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 592 JVMWrapper("JVM_MonitorWait"); 593 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 594 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 595 if (JvmtiExport::should_post_monitor_wait()) { 596 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 597 598 // The current thread already owns the monitor and it has not yet 599 // been added to the wait queue so the current thread cannot be 600 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 601 // event handler cannot accidentally consume an unpark() meant for 602 // the ParkEvent associated with this ObjectMonitor. 603 } 604 ObjectSynchronizer::wait(obj, ms, CHECK); 605 JVM_END 606 607 608 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 609 JVMWrapper("JVM_MonitorNotify"); 610 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 611 ObjectSynchronizer::notify(obj, CHECK); 612 JVM_END 613 614 615 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 616 JVMWrapper("JVM_MonitorNotifyAll"); 617 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 618 ObjectSynchronizer::notifyall(obj, CHECK); 619 JVM_END 620 621 622 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 623 JVMWrapper("JVM_Clone"); 624 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 625 Klass* klass = obj->klass(); 626 JvmtiVMObjectAllocEventCollector oam; 627 628 #ifdef ASSERT 629 // Just checking that the cloneable flag is set correct 630 if (obj->is_array()) { 631 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 632 } else { 633 guarantee(obj->is_instance(), "should be instanceOop"); 634 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 635 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 636 } 637 #endif 638 639 // Check if class of obj supports the Cloneable interface. 640 // All arrays are considered to be cloneable (See JLS 20.1.5) 641 if (!klass->is_cloneable()) { 642 ResourceMark rm(THREAD); 643 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 644 } 645 646 // Make shallow object copy 647 const int size = obj->size(); 648 oop new_obj_oop = NULL; 649 if (obj->is_array()) { 650 const int length = ((arrayOop)obj())->length(); 651 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 652 } else { 653 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 654 } 655 656 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread 657 // is modifying a reference field in the clonee, a non-oop-atomic copy might 658 // be suspended in the middle of copying the pointer and end up with parts 659 // of two different pointers in the field. Subsequent dereferences will crash. 660 // 4846409: an oop-copy of objects with long or double fields or arrays of same 661 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead 662 // of oops. We know objects are aligned on a minimum of an jlong boundary. 663 // The same is true of StubRoutines::object_copy and the various oop_copy 664 // variants, and of the code generated by the inline_native_clone intrinsic. 665 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); 666 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop, 667 align_object_size(size) / HeapWordsPerLong); 668 // Clear the header 669 new_obj_oop->init_mark(); 670 671 // Store check (mark entire object and let gc sort it out) 672 BarrierSet* bs = Universe::heap()->barrier_set(); 673 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); 674 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); 675 676 Handle new_obj(THREAD, new_obj_oop); 677 // Caution: this involves a java upcall, so the clone should be 678 // "gc-robust" by this stage. 679 if (klass->has_finalizer()) { 680 assert(obj->is_instance(), "should be instanceOop"); 681 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 682 new_obj = Handle(THREAD, new_obj_oop); 683 } 684 685 return JNIHandles::make_local(env, new_obj()); 686 JVM_END 687 688 // java.io.File /////////////////////////////////////////////////////////////// 689 690 JVM_LEAF(char*, JVM_NativePath(char* path)) 691 JVMWrapper("JVM_NativePath"); 692 return os::native_path(path); 693 JVM_END 694 695 696 // Misc. class handling /////////////////////////////////////////////////////////// 697 698 699 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 700 JVMWrapper("JVM_GetCallerClass"); 701 702 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 703 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 704 // temporarily for existing code to use until a replacement API is defined. 705 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 706 Klass* k = thread->security_get_caller_class(depth); 707 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 708 } 709 710 // Getting the class of the caller frame. 711 // 712 // The call stack at this point looks something like this: 713 // 714 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 715 // [1] [ @CallerSensitive API.method ] 716 // [.] [ (skipped intermediate frames) ] 717 // [n] [ caller ] 718 vframeStream vfst(thread); 719 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 720 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 721 Method* m = vfst.method(); 722 assert(m != NULL, "sanity"); 723 switch (n) { 724 case 0: 725 // This must only be called from Reflection.getCallerClass 726 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 727 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 728 } 729 // fall-through 730 case 1: 731 // Frame 0 and 1 must be caller sensitive. 732 if (!m->caller_sensitive()) { 733 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 734 } 735 break; 736 default: 737 if (!m->is_ignored_by_security_stack_walk()) { 738 // We have reached the desired frame; return the holder class. 739 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 740 } 741 break; 742 } 743 } 744 return NULL; 745 JVM_END 746 747 748 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 749 JVMWrapper("JVM_FindPrimitiveClass"); 750 oop mirror = NULL; 751 BasicType t = name2type(utf); 752 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 753 mirror = Universe::java_mirror(t); 754 } 755 if (mirror == NULL) { 756 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 757 } else { 758 return (jclass) JNIHandles::make_local(env, mirror); 759 } 760 JVM_END 761 762 763 // Returns a class loaded by the bootstrap class loader; or null 764 // if not found. ClassNotFoundException is not thrown. 765 // FindClassFromBootLoader is exported to the launcher for windows. 766 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 767 const char* name)) 768 JVMWrapper("JVM_FindClassFromBootLoader"); 769 770 // Java libraries should ensure that name is never null... 771 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 772 // It's impossible to create this class; the name cannot fit 773 // into the constant pool. 774 return NULL; 775 } 776 777 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 778 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 779 if (k == NULL) { 780 return NULL; 781 } 782 783 if (log_is_enabled(Debug, class, resolve)) { 784 trace_class_resolution(k); 785 } 786 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 787 JVM_END 788 789 // Find a class with this name in this loader, using the caller's protection domain. 790 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 791 jboolean init, jobject loader, 792 jclass caller)) 793 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 794 // Java libraries should ensure that name is never null... 795 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 796 // It's impossible to create this class; the name cannot fit 797 // into the constant pool. 798 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 799 } 800 801 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 802 803 oop loader_oop = JNIHandles::resolve(loader); 804 oop from_class = JNIHandles::resolve(caller); 805 oop protection_domain = NULL; 806 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 807 // NPE. Put it in another way, the bootstrap class loader has all permission and 808 // thus no checkPackageAccess equivalence in the VM class loader. 809 // The caller is also passed as NULL by the java code if there is no security 810 // manager to avoid the performance cost of getting the calling class. 811 if (from_class != NULL && loader_oop != NULL) { 812 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 813 } 814 815 Handle h_loader(THREAD, loader_oop); 816 Handle h_prot(THREAD, protection_domain); 817 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 818 h_prot, false, THREAD); 819 820 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 821 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 822 } 823 return result; 824 JVM_END 825 826 // Currently only called from the old verifier. 827 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 828 jboolean init, jclass from)) 829 JVMWrapper("JVM_FindClassFromClass"); 830 if (name == NULL) { 831 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 832 } 833 if ((int)strlen(name) > Symbol::max_length()) { 834 // It's impossible to create this class; the name cannot fit 835 // into the constant pool. 836 Exceptions::fthrow(THREAD_AND_LOCATION, 837 vmSymbols::java_lang_NoClassDefFoundError(), 838 "Class name exceeds maximum length of %d: %s", 839 Symbol::max_length(), 840 name); 841 return 0; 842 } 843 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 844 oop from_class_oop = JNIHandles::resolve(from); 845 Klass* from_class = (from_class_oop == NULL) 846 ? (Klass*)NULL 847 : java_lang_Class::as_Klass(from_class_oop); 848 oop class_loader = NULL; 849 oop protection_domain = NULL; 850 if (from_class != NULL) { 851 class_loader = from_class->class_loader(); 852 protection_domain = from_class->protection_domain(); 853 } 854 Handle h_loader(THREAD, class_loader); 855 Handle h_prot (THREAD, protection_domain); 856 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 857 h_prot, true, thread); 858 859 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 860 // this function is generally only used for class loading during verification. 861 ResourceMark rm; 862 oop from_mirror = JNIHandles::resolve_non_null(from); 863 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 864 const char * from_name = from_class->external_name(); 865 866 oop mirror = JNIHandles::resolve_non_null(result); 867 Klass* to_class = java_lang_Class::as_Klass(mirror); 868 const char * to = to_class->external_name(); 869 log_debug(class, resolve)("%s %s (verification)", from_name, to); 870 } 871 872 return result; 873 JVM_END 874 875 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 876 if (loader.is_null()) { 877 return; 878 } 879 880 // check whether the current caller thread holds the lock or not. 881 // If not, increment the corresponding counter 882 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 883 ObjectSynchronizer::owner_self) { 884 counter->inc(); 885 } 886 } 887 888 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 889 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 890 jobject loader, const jbyte *buf, 891 jsize len, jobject pd, const char *source, 892 TRAPS) { 893 if (source == NULL) source = "__JVM_DefineClass__"; 894 895 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 896 JavaThread* jt = (JavaThread*) THREAD; 897 898 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 899 ClassLoader::perf_define_appclass_selftime(), 900 ClassLoader::perf_define_appclasses(), 901 jt->get_thread_stat()->perf_recursion_counts_addr(), 902 jt->get_thread_stat()->perf_timers_addr(), 903 PerfClassTraceTime::DEFINE_CLASS); 904 905 if (UsePerfData) { 906 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 907 } 908 909 // Since exceptions can be thrown, class initialization can take place 910 // if name is NULL no check for class name in .class stream has to be made. 911 TempNewSymbol class_name = NULL; 912 if (name != NULL) { 913 const int str_len = (int)strlen(name); 914 if (str_len > Symbol::max_length()) { 915 // It's impossible to create this class; the name cannot fit 916 // into the constant pool. 917 Exceptions::fthrow(THREAD_AND_LOCATION, 918 vmSymbols::java_lang_NoClassDefFoundError(), 919 "Class name exceeds maximum length of %d: %s", 920 Symbol::max_length(), 921 name); 922 return 0; 923 } 924 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 925 } 926 927 ResourceMark rm(THREAD); 928 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 929 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 930 if (UsePerfData) { 931 is_lock_held_by_thread(class_loader, 932 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 933 THREAD); 934 } 935 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 936 Klass* k = SystemDictionary::resolve_from_stream(class_name, 937 class_loader, 938 protection_domain, 939 &st, 940 CHECK_NULL); 941 942 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 943 trace_class_resolution(k); 944 } 945 946 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 947 } 948 949 950 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 951 JVMWrapper("JVM_DefineClass"); 952 953 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 954 JVM_END 955 956 957 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 958 JVMWrapper("JVM_DefineClassWithSource"); 959 960 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 961 JVM_END 962 963 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 964 JVMWrapper("JVM_FindLoadedClass"); 965 ResourceMark rm(THREAD); 966 967 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 968 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 969 970 const char* str = java_lang_String::as_utf8_string(string()); 971 // Sanity check, don't expect null 972 if (str == NULL) return NULL; 973 974 const int str_len = (int)strlen(str); 975 if (str_len > Symbol::max_length()) { 976 // It's impossible to create this class; the name cannot fit 977 // into the constant pool. 978 return NULL; 979 } 980 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 981 982 // Security Note: 983 // The Java level wrapper will perform the necessary security check allowing 984 // us to pass the NULL as the initiating class loader. 985 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 986 if (UsePerfData) { 987 is_lock_held_by_thread(h_loader, 988 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 989 THREAD); 990 } 991 992 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 993 h_loader, 994 Handle(), 995 CHECK_NULL); 996 #if INCLUDE_CDS 997 if (k == NULL) { 998 // If the class is not already loaded, try to see if it's in the shared 999 // archive for the current classloader (h_loader). 1000 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1001 } 1002 #endif 1003 return (k == NULL) ? NULL : 1004 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1005 JVM_END 1006 1007 // Module support ////////////////////////////////////////////////////////////////////////////// 1008 1009 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1010 jstring location, const char* const* packages, jsize num_packages)) 1011 JVMWrapper("JVM_DefineModule"); 1012 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1013 JVM_END 1014 1015 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1016 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1017 Modules::set_bootloader_unnamed_module(module, CHECK); 1018 JVM_END 1019 1020 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1021 JVMWrapper("JVM_AddModuleExports"); 1022 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1023 JVM_END 1024 1025 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1026 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1027 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1028 JVM_END 1029 1030 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1031 JVMWrapper("JVM_AddModuleExportsToAll"); 1032 Modules::add_module_exports(from_module, package, NULL, CHECK); 1033 JVM_END 1034 1035 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1036 JVMWrapper("JVM_AddReadsModule"); 1037 Modules::add_reads_module(from_module, source_module, CHECK); 1038 JVM_END 1039 1040 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1041 1042 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1043 assert (cls != NULL, "illegal class"); 1044 JVMWrapper("JVM_GetClassName"); 1045 JvmtiVMObjectAllocEventCollector oam; 1046 ResourceMark rm(THREAD); 1047 const char* name; 1048 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1049 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1050 } else { 1051 // Consider caching interned string in Klass 1052 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1053 assert(k->is_klass(), "just checking"); 1054 name = k->external_name(); 1055 } 1056 oop result = StringTable::intern((char*) name, CHECK_NULL); 1057 return (jstring) JNIHandles::make_local(env, result); 1058 JVM_END 1059 1060 1061 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1062 JVMWrapper("JVM_GetClassInterfaces"); 1063 JvmtiVMObjectAllocEventCollector oam; 1064 oop mirror = JNIHandles::resolve_non_null(cls); 1065 1066 // Special handling for primitive objects 1067 if (java_lang_Class::is_primitive(mirror)) { 1068 // Primitive objects does not have any interfaces 1069 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1070 return (jobjectArray) JNIHandles::make_local(env, r); 1071 } 1072 1073 Klass* klass = java_lang_Class::as_Klass(mirror); 1074 // Figure size of result array 1075 int size; 1076 if (klass->is_instance_klass()) { 1077 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1078 } else { 1079 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1080 size = 2; 1081 } 1082 1083 // Allocate result array 1084 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1085 objArrayHandle result (THREAD, r); 1086 // Fill in result 1087 if (klass->is_instance_klass()) { 1088 // Regular instance klass, fill in all local interfaces 1089 for (int index = 0; index < size; index++) { 1090 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1091 result->obj_at_put(index, k->java_mirror()); 1092 } 1093 } else { 1094 // All arrays implement java.lang.Cloneable and java.io.Serializable 1095 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1096 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1097 } 1098 return (jobjectArray) JNIHandles::make_local(env, result()); 1099 JVM_END 1100 1101 1102 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1103 JVMWrapper("JVM_IsInterface"); 1104 oop mirror = JNIHandles::resolve_non_null(cls); 1105 if (java_lang_Class::is_primitive(mirror)) { 1106 return JNI_FALSE; 1107 } 1108 Klass* k = java_lang_Class::as_Klass(mirror); 1109 jboolean result = k->is_interface(); 1110 assert(!result || k->is_instance_klass(), 1111 "all interfaces are instance types"); 1112 // The compiler intrinsic for isInterface tests the 1113 // Klass::_access_flags bits in the same way. 1114 return result; 1115 JVM_END 1116 1117 1118 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1119 JVMWrapper("JVM_GetClassSigners"); 1120 JvmtiVMObjectAllocEventCollector oam; 1121 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1122 // There are no signers for primitive types 1123 return NULL; 1124 } 1125 1126 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1127 1128 // If there are no signers set in the class, or if the class 1129 // is an array, return NULL. 1130 if (signers == NULL) return NULL; 1131 1132 // copy of the signers array 1133 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1134 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1135 for (int index = 0; index < signers->length(); index++) { 1136 signers_copy->obj_at_put(index, signers->obj_at(index)); 1137 } 1138 1139 // return the copy 1140 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1141 JVM_END 1142 1143 1144 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1145 JVMWrapper("JVM_SetClassSigners"); 1146 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1147 // This call is ignored for primitive types and arrays. 1148 // Signers are only set once, ClassLoader.java, and thus shouldn't 1149 // be called with an array. Only the bootstrap loader creates arrays. 1150 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1151 if (k->is_instance_klass()) { 1152 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1153 } 1154 } 1155 JVM_END 1156 1157 1158 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1159 JVMWrapper("JVM_GetProtectionDomain"); 1160 if (JNIHandles::resolve(cls) == NULL) { 1161 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1162 } 1163 1164 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1165 // Primitive types does not have a protection domain. 1166 return NULL; 1167 } 1168 1169 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1170 return (jobject) JNIHandles::make_local(env, pd); 1171 JVM_END 1172 1173 1174 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) { 1175 // If there is a security manager and protection domain, check the access 1176 // in the protection domain, otherwise it is authorized. 1177 if (java_lang_System::has_security_manager()) { 1178 1179 // For bootstrapping, if pd implies method isn't in the JDK, allow 1180 // this context to revert to older behavior. 1181 // In this case the isAuthorized field in AccessControlContext is also not 1182 // present. 1183 if (Universe::protection_domain_implies_method() == NULL) { 1184 return true; 1185 } 1186 1187 // Whitelist certain access control contexts 1188 if (java_security_AccessControlContext::is_authorized(context)) { 1189 return true; 1190 } 1191 1192 oop prot = klass->protection_domain(); 1193 if (prot != NULL) { 1194 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1195 // in the new wrapper. 1196 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1197 Handle h_prot(THREAD, prot); 1198 JavaValue result(T_BOOLEAN); 1199 JavaCallArguments args(h_prot); 1200 JavaCalls::call(&result, m, &args, CHECK_false); 1201 return (result.get_jboolean() != 0); 1202 } 1203 } 1204 return true; 1205 } 1206 1207 // Create an AccessControlContext with a protection domain with null codesource 1208 // and null permissions - which gives no permissions. 1209 oop create_dummy_access_control_context(TRAPS) { 1210 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1211 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1212 // Call constructor ProtectionDomain(null, null); 1213 JavaValue result(T_VOID); 1214 JavaCalls::call_special(&result, obj, pd_klass, 1215 vmSymbols::object_initializer_name(), 1216 vmSymbols::codesource_permissioncollection_signature(), 1217 Handle(), Handle(), CHECK_NULL); 1218 1219 // new ProtectionDomain[] {pd}; 1220 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1221 context->obj_at_put(0, obj()); 1222 1223 // new AccessControlContext(new ProtectionDomain[] {pd}) 1224 objArrayHandle h_context(THREAD, context); 1225 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1226 return acc; 1227 } 1228 1229 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1230 JVMWrapper("JVM_DoPrivileged"); 1231 1232 if (action == NULL) { 1233 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1234 } 1235 1236 // Compute the frame initiating the do privileged operation and setup the privileged stack 1237 vframeStream vfst(thread); 1238 vfst.security_get_caller_frame(1); 1239 1240 if (vfst.at_end()) { 1241 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1242 } 1243 1244 Method* method = vfst.method(); 1245 InstanceKlass* klass = method->method_holder(); 1246 1247 // Check that action object understands "Object run()" 1248 Handle h_context; 1249 if (context != NULL) { 1250 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1251 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1252 if (!authorized) { 1253 // Create an unprivileged access control object and call it's run function 1254 // instead. 1255 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1256 h_context = Handle(THREAD, noprivs); 1257 } 1258 } 1259 1260 // Check that action object understands "Object run()" 1261 Handle object (THREAD, JNIHandles::resolve(action)); 1262 1263 // get run() method 1264 Method* m_oop = object->klass()->uncached_lookup_method( 1265 vmSymbols::run_method_name(), 1266 vmSymbols::void_object_signature(), 1267 Klass::find_overpass); 1268 1269 // See if there is a default method for "Object run()". 1270 if (m_oop == NULL && object->klass()->is_instance_klass()) { 1271 InstanceKlass* iklass = InstanceKlass::cast(object->klass()); 1272 m_oop = iklass->lookup_method_in_ordered_interfaces( 1273 vmSymbols::run_method_name(), 1274 vmSymbols::void_object_signature()); 1275 } 1276 1277 methodHandle m (THREAD, m_oop); 1278 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) { 1279 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1280 } 1281 1282 // Stack allocated list of privileged stack elements 1283 PrivilegedElement pi; 1284 if (!vfst.at_end()) { 1285 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1286 thread->set_privileged_stack_top(&pi); 1287 } 1288 1289 1290 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1291 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1292 Handle pending_exception; 1293 JavaValue result(T_OBJECT); 1294 JavaCallArguments args(object); 1295 JavaCalls::call(&result, m, &args, THREAD); 1296 1297 // done with action, remove ourselves from the list 1298 if (!vfst.at_end()) { 1299 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1300 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1301 } 1302 1303 if (HAS_PENDING_EXCEPTION) { 1304 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1305 CLEAR_PENDING_EXCEPTION; 1306 // JVMTI has already reported the pending exception 1307 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1308 if (THREAD->is_Java_thread()) { 1309 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1310 } 1311 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1312 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1313 // Throw a java.security.PrivilegedActionException(Exception e) exception 1314 JavaCallArguments args(pending_exception); 1315 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1316 vmSymbols::exception_void_signature(), 1317 &args); 1318 } 1319 } 1320 1321 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1322 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1323 JVM_END 1324 1325 1326 // Returns the inherited_access_control_context field of the running thread. 1327 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1328 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1329 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1330 return JNIHandles::make_local(env, result); 1331 JVM_END 1332 1333 class RegisterArrayForGC { 1334 private: 1335 JavaThread *_thread; 1336 public: 1337 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1338 _thread = thread; 1339 _thread->register_array_for_gc(array); 1340 } 1341 1342 ~RegisterArrayForGC() { 1343 _thread->register_array_for_gc(NULL); 1344 } 1345 }; 1346 1347 1348 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1349 JVMWrapper("JVM_GetStackAccessControlContext"); 1350 if (!UsePrivilegedStack) return NULL; 1351 1352 ResourceMark rm(THREAD); 1353 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1354 JvmtiVMObjectAllocEventCollector oam; 1355 1356 // count the protection domains on the execution stack. We collapse 1357 // duplicate consecutive protection domains into a single one, as 1358 // well as stopping when we hit a privileged frame. 1359 1360 // Use vframeStream to iterate through Java frames 1361 vframeStream vfst(thread); 1362 1363 oop previous_protection_domain = NULL; 1364 Handle privileged_context(thread, NULL); 1365 bool is_privileged = false; 1366 oop protection_domain = NULL; 1367 1368 for(; !vfst.at_end(); vfst.next()) { 1369 // get method of frame 1370 Method* method = vfst.method(); 1371 intptr_t* frame_id = vfst.frame_id(); 1372 1373 // check the privileged frames to see if we have a match 1374 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1375 // this frame is privileged 1376 is_privileged = true; 1377 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1378 protection_domain = thread->privileged_stack_top()->protection_domain(); 1379 } else { 1380 protection_domain = method->method_holder()->protection_domain(); 1381 } 1382 1383 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1384 local_array->push(protection_domain); 1385 previous_protection_domain = protection_domain; 1386 } 1387 1388 if (is_privileged) break; 1389 } 1390 1391 1392 // either all the domains on the stack were system domains, or 1393 // we had a privileged system domain 1394 if (local_array->is_empty()) { 1395 if (is_privileged && privileged_context.is_null()) return NULL; 1396 1397 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1398 return JNIHandles::make_local(env, result); 1399 } 1400 1401 // the resource area must be registered in case of a gc 1402 RegisterArrayForGC ragc(thread, local_array); 1403 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1404 local_array->length(), CHECK_NULL); 1405 objArrayHandle h_context(thread, context); 1406 for (int index = 0; index < local_array->length(); index++) { 1407 h_context->obj_at_put(index, local_array->at(index)); 1408 } 1409 1410 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1411 1412 return JNIHandles::make_local(env, result); 1413 JVM_END 1414 1415 1416 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1417 JVMWrapper("JVM_IsArrayClass"); 1418 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1419 return (k != NULL) && k->is_array_klass() ? true : false; 1420 JVM_END 1421 1422 1423 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1424 JVMWrapper("JVM_IsPrimitiveClass"); 1425 oop mirror = JNIHandles::resolve_non_null(cls); 1426 return (jboolean) java_lang_Class::is_primitive(mirror); 1427 JVM_END 1428 1429 1430 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1431 JVMWrapper("JVM_GetClassModifiers"); 1432 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1433 // Primitive type 1434 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1435 } 1436 1437 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1438 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1439 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1440 return k->modifier_flags(); 1441 JVM_END 1442 1443 1444 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1445 1446 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1447 JvmtiVMObjectAllocEventCollector oam; 1448 // ofClass is a reference to a java_lang_Class object. The mirror object 1449 // of an InstanceKlass 1450 1451 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1452 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1453 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1454 return (jobjectArray)JNIHandles::make_local(env, result); 1455 } 1456 1457 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1458 InnerClassesIterator iter(k); 1459 1460 if (iter.length() == 0) { 1461 // Neither an inner nor outer class 1462 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1463 return (jobjectArray)JNIHandles::make_local(env, result); 1464 } 1465 1466 // find inner class info 1467 constantPoolHandle cp(thread, k->constants()); 1468 int length = iter.length(); 1469 1470 // Allocate temp. result array 1471 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1472 objArrayHandle result (THREAD, r); 1473 int members = 0; 1474 1475 for (; !iter.done(); iter.next()) { 1476 int ioff = iter.inner_class_info_index(); 1477 int ooff = iter.outer_class_info_index(); 1478 1479 if (ioff != 0 && ooff != 0) { 1480 // Check to see if the name matches the class we're looking for 1481 // before attempting to find the class. 1482 if (cp->klass_name_at_matches(k, ooff)) { 1483 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1484 if (outer_klass == k) { 1485 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1486 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1487 1488 // Throws an exception if outer klass has not declared k as 1489 // an inner klass 1490 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1491 1492 result->obj_at_put(members, inner_klass->java_mirror()); 1493 members++; 1494 } 1495 } 1496 } 1497 } 1498 1499 if (members != length) { 1500 // Return array of right length 1501 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1502 for(int i = 0; i < members; i++) { 1503 res->obj_at_put(i, result->obj_at(i)); 1504 } 1505 return (jobjectArray)JNIHandles::make_local(env, res); 1506 } 1507 1508 return (jobjectArray)JNIHandles::make_local(env, result()); 1509 JVM_END 1510 1511 1512 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1513 { 1514 // ofClass is a reference to a java_lang_Class object. 1515 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1516 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1517 return NULL; 1518 } 1519 1520 bool inner_is_member = false; 1521 Klass* outer_klass 1522 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1523 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1524 if (outer_klass == NULL) return NULL; // already a top-level class 1525 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1526 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1527 } 1528 JVM_END 1529 1530 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1531 { 1532 oop mirror = JNIHandles::resolve_non_null(cls); 1533 if (java_lang_Class::is_primitive(mirror) || 1534 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1535 return NULL; 1536 } 1537 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1538 int ooff = 0, noff = 0; 1539 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1540 if (noff != 0) { 1541 constantPoolHandle i_cp(thread, k->constants()); 1542 Symbol* name = i_cp->symbol_at(noff); 1543 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1544 return (jstring) JNIHandles::make_local(env, str()); 1545 } 1546 } 1547 return NULL; 1548 } 1549 JVM_END 1550 1551 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1552 assert (cls != NULL, "illegal class"); 1553 JVMWrapper("JVM_GetClassSignature"); 1554 JvmtiVMObjectAllocEventCollector oam; 1555 ResourceMark rm(THREAD); 1556 // Return null for arrays and primatives 1557 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1558 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1559 if (k->is_instance_klass()) { 1560 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1561 if (sym == NULL) return NULL; 1562 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1563 return (jstring) JNIHandles::make_local(env, str()); 1564 } 1565 } 1566 return NULL; 1567 JVM_END 1568 1569 1570 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1571 assert (cls != NULL, "illegal class"); 1572 JVMWrapper("JVM_GetClassAnnotations"); 1573 1574 // Return null for arrays and primitives 1575 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1576 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1577 if (k->is_instance_klass()) { 1578 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1579 return (jbyteArray) JNIHandles::make_local(env, a); 1580 } 1581 } 1582 return NULL; 1583 JVM_END 1584 1585 1586 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1587 // some of this code was adapted from from jni_FromReflectedField 1588 1589 oop reflected = JNIHandles::resolve_non_null(field); 1590 oop mirror = java_lang_reflect_Field::clazz(reflected); 1591 Klass* k = java_lang_Class::as_Klass(mirror); 1592 int slot = java_lang_reflect_Field::slot(reflected); 1593 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1594 1595 InstanceKlass* ik = InstanceKlass::cast(k); 1596 intptr_t offset = ik->field_offset(slot); 1597 1598 if (modifiers & JVM_ACC_STATIC) { 1599 // for static fields we only look in the current class 1600 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1601 assert(false, "cannot find static field"); 1602 return false; 1603 } 1604 } else { 1605 // for instance fields we start with the current class and work 1606 // our way up through the superclass chain 1607 if (!ik->find_field_from_offset(offset, false, &fd)) { 1608 assert(false, "cannot find instance field"); 1609 return false; 1610 } 1611 } 1612 return true; 1613 } 1614 1615 static Method* jvm_get_method_common(jobject method) { 1616 // some of this code was adapted from from jni_FromReflectedMethod 1617 1618 oop reflected = JNIHandles::resolve_non_null(method); 1619 oop mirror = NULL; 1620 int slot = 0; 1621 1622 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1623 mirror = java_lang_reflect_Constructor::clazz(reflected); 1624 slot = java_lang_reflect_Constructor::slot(reflected); 1625 } else { 1626 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1627 "wrong type"); 1628 mirror = java_lang_reflect_Method::clazz(reflected); 1629 slot = java_lang_reflect_Method::slot(reflected); 1630 } 1631 Klass* k = java_lang_Class::as_Klass(mirror); 1632 1633 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1634 assert(m != NULL, "cannot find method"); 1635 return m; // caller has to deal with NULL in product mode 1636 } 1637 1638 /* Type use annotations support (JDK 1.8) */ 1639 1640 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1641 assert (cls != NULL, "illegal class"); 1642 JVMWrapper("JVM_GetClassTypeAnnotations"); 1643 ResourceMark rm(THREAD); 1644 // Return null for arrays and primitives 1645 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1646 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1647 if (k->is_instance_klass()) { 1648 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1649 if (type_annotations != NULL) { 1650 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1651 return (jbyteArray) JNIHandles::make_local(env, a); 1652 } 1653 } 1654 } 1655 return NULL; 1656 JVM_END 1657 1658 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1659 assert (method != NULL, "illegal method"); 1660 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1661 1662 // method is a handle to a java.lang.reflect.Method object 1663 Method* m = jvm_get_method_common(method); 1664 if (m == NULL) { 1665 return NULL; 1666 } 1667 1668 AnnotationArray* type_annotations = m->type_annotations(); 1669 if (type_annotations != NULL) { 1670 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1671 return (jbyteArray) JNIHandles::make_local(env, a); 1672 } 1673 1674 return NULL; 1675 JVM_END 1676 1677 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1678 assert (field != NULL, "illegal field"); 1679 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1680 1681 fieldDescriptor fd; 1682 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1683 if (!gotFd) { 1684 return NULL; 1685 } 1686 1687 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1688 JVM_END 1689 1690 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1691 if (!cp->is_within_bounds(index)) { 1692 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1693 } 1694 } 1695 1696 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1697 { 1698 JVMWrapper("JVM_GetMethodParameters"); 1699 // method is a handle to a java.lang.reflect.Method object 1700 Method* method_ptr = jvm_get_method_common(method); 1701 methodHandle mh (THREAD, method_ptr); 1702 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1703 const int num_params = mh->method_parameters_length(); 1704 1705 if (num_params < 0) { 1706 // A -1 return value from method_parameters_length means there is no 1707 // parameter data. Return null to indicate this to the reflection 1708 // API. 1709 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1710 return (jobjectArray)NULL; 1711 } else { 1712 // Otherwise, we return something up to reflection, even if it is 1713 // a zero-length array. Why? Because in some cases this can 1714 // trigger a MalformedParametersException. 1715 1716 // make sure all the symbols are properly formatted 1717 for (int i = 0; i < num_params; i++) { 1718 MethodParametersElement* params = mh->method_parameters_start(); 1719 int index = params[i].name_cp_index; 1720 bounds_check(mh->constants(), index, CHECK_NULL); 1721 1722 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1723 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1724 "Wrong type at constant pool index"); 1725 } 1726 1727 } 1728 1729 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1730 objArrayHandle result (THREAD, result_oop); 1731 1732 for (int i = 0; i < num_params; i++) { 1733 MethodParametersElement* params = mh->method_parameters_start(); 1734 // For a 0 index, give a NULL symbol 1735 Symbol* sym = 0 != params[i].name_cp_index ? 1736 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1737 int flags = params[i].flags; 1738 oop param = Reflection::new_parameter(reflected_method, i, sym, 1739 flags, CHECK_NULL); 1740 result->obj_at_put(i, param); 1741 } 1742 return (jobjectArray)JNIHandles::make_local(env, result()); 1743 } 1744 } 1745 JVM_END 1746 1747 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1748 1749 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1750 { 1751 JVMWrapper("JVM_GetClassDeclaredFields"); 1752 JvmtiVMObjectAllocEventCollector oam; 1753 1754 // Exclude primitive types and array types 1755 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1756 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1757 // Return empty array 1758 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1759 return (jobjectArray) JNIHandles::make_local(env, res); 1760 } 1761 1762 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1763 constantPoolHandle cp(THREAD, k->constants()); 1764 1765 // Ensure class is linked 1766 k->link_class(CHECK_NULL); 1767 1768 // Allocate result 1769 int num_fields; 1770 1771 if (publicOnly) { 1772 num_fields = 0; 1773 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1774 if (fs.access_flags().is_public()) ++num_fields; 1775 } 1776 } else { 1777 num_fields = k->java_fields_count(); 1778 } 1779 1780 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1781 objArrayHandle result (THREAD, r); 1782 1783 int out_idx = 0; 1784 fieldDescriptor fd; 1785 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1786 if (!publicOnly || fs.access_flags().is_public()) { 1787 fd.reinitialize(k, fs.index()); 1788 oop field = Reflection::new_field(&fd, CHECK_NULL); 1789 result->obj_at_put(out_idx, field); 1790 ++out_idx; 1791 } 1792 } 1793 assert(out_idx == num_fields, "just checking"); 1794 return (jobjectArray) JNIHandles::make_local(env, result()); 1795 } 1796 JVM_END 1797 1798 static bool select_method(const methodHandle& method, bool want_constructor) { 1799 if (want_constructor) { 1800 return (method->is_initializer() && !method->is_static()); 1801 } else { 1802 return (!method->is_initializer() && !method->is_overpass()); 1803 } 1804 } 1805 1806 static jobjectArray get_class_declared_methods_helper( 1807 JNIEnv *env, 1808 jclass ofClass, jboolean publicOnly, 1809 bool want_constructor, 1810 Klass* klass, TRAPS) { 1811 1812 JvmtiVMObjectAllocEventCollector oam; 1813 1814 // Exclude primitive types and array types 1815 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1816 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1817 // Return empty array 1818 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1819 return (jobjectArray) JNIHandles::make_local(env, res); 1820 } 1821 1822 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1823 1824 // Ensure class is linked 1825 k->link_class(CHECK_NULL); 1826 1827 Array<Method*>* methods = k->methods(); 1828 int methods_length = methods->length(); 1829 1830 // Save original method_idnum in case of redefinition, which can change 1831 // the idnum of obsolete methods. The new method will have the same idnum 1832 // but if we refresh the methods array, the counts will be wrong. 1833 ResourceMark rm(THREAD); 1834 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1835 int num_methods = 0; 1836 1837 for (int i = 0; i < methods_length; i++) { 1838 methodHandle method(THREAD, methods->at(i)); 1839 if (select_method(method, want_constructor)) { 1840 if (!publicOnly || method->is_public()) { 1841 idnums->push(method->method_idnum()); 1842 ++num_methods; 1843 } 1844 } 1845 } 1846 1847 // Allocate result 1848 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1849 objArrayHandle result (THREAD, r); 1850 1851 // Now just put the methods that we selected above, but go by their idnum 1852 // in case of redefinition. The methods can be redefined at any safepoint, 1853 // so above when allocating the oop array and below when creating reflect 1854 // objects. 1855 for (int i = 0; i < num_methods; i++) { 1856 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1857 if (method.is_null()) { 1858 // Method may have been deleted and seems this API can handle null 1859 // Otherwise should probably put a method that throws NSME 1860 result->obj_at_put(i, NULL); 1861 } else { 1862 oop m; 1863 if (want_constructor) { 1864 m = Reflection::new_constructor(method, CHECK_NULL); 1865 } else { 1866 m = Reflection::new_method(method, false, CHECK_NULL); 1867 } 1868 result->obj_at_put(i, m); 1869 } 1870 } 1871 1872 return (jobjectArray) JNIHandles::make_local(env, result()); 1873 } 1874 1875 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1876 { 1877 JVMWrapper("JVM_GetClassDeclaredMethods"); 1878 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1879 /*want_constructor*/ false, 1880 SystemDictionary::reflect_Method_klass(), THREAD); 1881 } 1882 JVM_END 1883 1884 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1885 { 1886 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1887 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1888 /*want_constructor*/ true, 1889 SystemDictionary::reflect_Constructor_klass(), THREAD); 1890 } 1891 JVM_END 1892 1893 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1894 { 1895 JVMWrapper("JVM_GetClassAccessFlags"); 1896 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1897 // Primitive type 1898 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1899 } 1900 1901 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1902 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1903 } 1904 JVM_END 1905 1906 1907 // Constant pool access ////////////////////////////////////////////////////////// 1908 1909 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1910 { 1911 JVMWrapper("JVM_GetClassConstantPool"); 1912 JvmtiVMObjectAllocEventCollector oam; 1913 1914 // Return null for primitives and arrays 1915 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1916 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1917 if (k->is_instance_klass()) { 1918 InstanceKlass* k_h = InstanceKlass::cast(k); 1919 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1920 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1921 return JNIHandles::make_local(jcp()); 1922 } 1923 } 1924 return NULL; 1925 } 1926 JVM_END 1927 1928 1929 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1930 { 1931 JVMWrapper("JVM_ConstantPoolGetSize"); 1932 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1933 return cp->length(); 1934 } 1935 JVM_END 1936 1937 1938 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1939 { 1940 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1941 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1942 bounds_check(cp, index, CHECK_NULL); 1943 constantTag tag = cp->tag_at(index); 1944 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1945 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1946 } 1947 Klass* k = cp->klass_at(index, CHECK_NULL); 1948 return (jclass) JNIHandles::make_local(k->java_mirror()); 1949 } 1950 JVM_END 1951 1952 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1953 { 1954 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1955 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1956 bounds_check(cp, index, CHECK_NULL); 1957 constantTag tag = cp->tag_at(index); 1958 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1959 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1960 } 1961 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1962 if (k == NULL) return NULL; 1963 return (jclass) JNIHandles::make_local(k->java_mirror()); 1964 } 1965 JVM_END 1966 1967 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 1968 constantTag tag = cp->tag_at(index); 1969 if (!tag.is_method() && !tag.is_interface_method()) { 1970 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1971 } 1972 int klass_ref = cp->uncached_klass_ref_index_at(index); 1973 Klass* k_o; 1974 if (force_resolution) { 1975 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1976 } else { 1977 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1978 if (k_o == NULL) return NULL; 1979 } 1980 InstanceKlass* k = InstanceKlass::cast(k_o); 1981 Symbol* name = cp->uncached_name_ref_at(index); 1982 Symbol* sig = cp->uncached_signature_ref_at(index); 1983 methodHandle m (THREAD, k->find_method(name, sig)); 1984 if (m.is_null()) { 1985 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1986 } 1987 oop method; 1988 if (!m->is_initializer() || m->is_static()) { 1989 method = Reflection::new_method(m, true, CHECK_NULL); 1990 } else { 1991 method = Reflection::new_constructor(m, CHECK_NULL); 1992 } 1993 return JNIHandles::make_local(method); 1994 } 1995 1996 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1997 { 1998 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1999 JvmtiVMObjectAllocEventCollector oam; 2000 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2001 bounds_check(cp, index, CHECK_NULL); 2002 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2003 return res; 2004 } 2005 JVM_END 2006 2007 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2008 { 2009 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2010 JvmtiVMObjectAllocEventCollector oam; 2011 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2012 bounds_check(cp, index, CHECK_NULL); 2013 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2014 return res; 2015 } 2016 JVM_END 2017 2018 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2019 constantTag tag = cp->tag_at(index); 2020 if (!tag.is_field()) { 2021 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2022 } 2023 int klass_ref = cp->uncached_klass_ref_index_at(index); 2024 Klass* k_o; 2025 if (force_resolution) { 2026 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2027 } else { 2028 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2029 if (k_o == NULL) return NULL; 2030 } 2031 InstanceKlass* k = InstanceKlass::cast(k_o); 2032 Symbol* name = cp->uncached_name_ref_at(index); 2033 Symbol* sig = cp->uncached_signature_ref_at(index); 2034 fieldDescriptor fd; 2035 Klass* target_klass = k->find_field(name, sig, &fd); 2036 if (target_klass == NULL) { 2037 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2038 } 2039 oop field = Reflection::new_field(&fd, CHECK_NULL); 2040 return JNIHandles::make_local(field); 2041 } 2042 2043 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2044 { 2045 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2046 JvmtiVMObjectAllocEventCollector oam; 2047 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2048 bounds_check(cp, index, CHECK_NULL); 2049 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2050 return res; 2051 } 2052 JVM_END 2053 2054 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2055 { 2056 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2057 JvmtiVMObjectAllocEventCollector oam; 2058 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2059 bounds_check(cp, index, CHECK_NULL); 2060 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2061 return res; 2062 } 2063 JVM_END 2064 2065 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2066 { 2067 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2068 JvmtiVMObjectAllocEventCollector oam; 2069 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2070 bounds_check(cp, index, CHECK_NULL); 2071 constantTag tag = cp->tag_at(index); 2072 if (!tag.is_field_or_method()) { 2073 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2074 } 2075 int klass_ref = cp->uncached_klass_ref_index_at(index); 2076 Symbol* klass_name = cp->klass_name_at(klass_ref); 2077 Symbol* member_name = cp->uncached_name_ref_at(index); 2078 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2079 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2080 objArrayHandle dest(THREAD, dest_o); 2081 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2082 dest->obj_at_put(0, str()); 2083 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2084 dest->obj_at_put(1, str()); 2085 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2086 dest->obj_at_put(2, str()); 2087 return (jobjectArray) JNIHandles::make_local(dest()); 2088 } 2089 JVM_END 2090 2091 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2092 { 2093 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2094 JvmtiVMObjectAllocEventCollector oam; 2095 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2096 bounds_check(cp, index, CHECK_0); 2097 constantTag tag = cp->tag_at(index); 2098 if (!tag.is_field_or_method()) { 2099 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2100 } 2101 return (jint) cp->uncached_klass_ref_index_at(index); 2102 } 2103 JVM_END 2104 2105 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2106 { 2107 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2108 JvmtiVMObjectAllocEventCollector oam; 2109 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2110 bounds_check(cp, index, CHECK_0); 2111 constantTag tag = cp->tag_at(index); 2112 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2113 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2114 } 2115 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2116 } 2117 JVM_END 2118 2119 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2120 { 2121 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2122 JvmtiVMObjectAllocEventCollector oam; 2123 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2124 bounds_check(cp, index, CHECK_NULL); 2125 constantTag tag = cp->tag_at(index); 2126 if (!tag.is_name_and_type()) { 2127 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2128 } 2129 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2130 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2131 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2132 objArrayHandle dest(THREAD, dest_o); 2133 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2134 dest->obj_at_put(0, str()); 2135 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2136 dest->obj_at_put(1, str()); 2137 return (jobjectArray) JNIHandles::make_local(dest()); 2138 } 2139 JVM_END 2140 2141 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2142 { 2143 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2144 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2145 bounds_check(cp, index, CHECK_0); 2146 constantTag tag = cp->tag_at(index); 2147 if (!tag.is_int()) { 2148 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2149 } 2150 return cp->int_at(index); 2151 } 2152 JVM_END 2153 2154 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2155 { 2156 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2157 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2158 bounds_check(cp, index, CHECK_(0L)); 2159 constantTag tag = cp->tag_at(index); 2160 if (!tag.is_long()) { 2161 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2162 } 2163 return cp->long_at(index); 2164 } 2165 JVM_END 2166 2167 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2168 { 2169 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2170 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2171 bounds_check(cp, index, CHECK_(0.0f)); 2172 constantTag tag = cp->tag_at(index); 2173 if (!tag.is_float()) { 2174 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2175 } 2176 return cp->float_at(index); 2177 } 2178 JVM_END 2179 2180 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2181 { 2182 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2183 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2184 bounds_check(cp, index, CHECK_(0.0)); 2185 constantTag tag = cp->tag_at(index); 2186 if (!tag.is_double()) { 2187 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2188 } 2189 return cp->double_at(index); 2190 } 2191 JVM_END 2192 2193 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2194 { 2195 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2196 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2197 bounds_check(cp, index, CHECK_NULL); 2198 constantTag tag = cp->tag_at(index); 2199 if (!tag.is_string()) { 2200 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2201 } 2202 oop str = cp->string_at(index, CHECK_NULL); 2203 return (jstring) JNIHandles::make_local(str); 2204 } 2205 JVM_END 2206 2207 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2208 { 2209 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2210 JvmtiVMObjectAllocEventCollector oam; 2211 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2212 bounds_check(cp, index, CHECK_NULL); 2213 constantTag tag = cp->tag_at(index); 2214 if (!tag.is_symbol()) { 2215 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2216 } 2217 Symbol* sym = cp->symbol_at(index); 2218 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2219 return (jstring) JNIHandles::make_local(str()); 2220 } 2221 JVM_END 2222 2223 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2224 { 2225 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2226 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2227 bounds_check(cp, index, CHECK_0); 2228 constantTag tag = cp->tag_at(index); 2229 jbyte result = tag.value(); 2230 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2231 // they are changed to the corresponding tags from the JVM spec, so that java code in 2232 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2233 if (tag.is_klass_or_reference()) { 2234 result = JVM_CONSTANT_Class; 2235 } else if (tag.is_string_index()) { 2236 result = JVM_CONSTANT_String; 2237 } else if (tag.is_method_type_in_error()) { 2238 result = JVM_CONSTANT_MethodType; 2239 } else if (tag.is_method_handle_in_error()) { 2240 result = JVM_CONSTANT_MethodHandle; 2241 } 2242 return result; 2243 } 2244 JVM_END 2245 2246 // Assertion support. ////////////////////////////////////////////////////////// 2247 2248 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2249 JVMWrapper("JVM_DesiredAssertionStatus"); 2250 assert(cls != NULL, "bad class"); 2251 2252 oop r = JNIHandles::resolve(cls); 2253 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2254 if (java_lang_Class::is_primitive(r)) return false; 2255 2256 Klass* k = java_lang_Class::as_Klass(r); 2257 assert(k->is_instance_klass(), "must be an instance klass"); 2258 if (!k->is_instance_klass()) return false; 2259 2260 ResourceMark rm(THREAD); 2261 const char* name = k->name()->as_C_string(); 2262 bool system_class = k->class_loader() == NULL; 2263 return JavaAssertions::enabled(name, system_class); 2264 2265 JVM_END 2266 2267 2268 // Return a new AssertionStatusDirectives object with the fields filled in with 2269 // command-line assertion arguments (i.e., -ea, -da). 2270 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2271 JVMWrapper("JVM_AssertionStatusDirectives"); 2272 JvmtiVMObjectAllocEventCollector oam; 2273 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2274 return JNIHandles::make_local(env, asd); 2275 JVM_END 2276 2277 // Verification //////////////////////////////////////////////////////////////////////////////// 2278 2279 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2280 2281 // RedefineClasses support: bug 6214132 caused verification to fail. 2282 // All functions from this section should call the jvmtiThreadSate function: 2283 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2284 // The function returns a Klass* of the _scratch_class if the verifier 2285 // was invoked in the middle of the class redefinition. 2286 // Otherwise it returns its argument value which is the _the_class Klass*. 2287 // Please, refer to the description in the jvmtiThreadSate.hpp. 2288 2289 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2290 JVMWrapper("JVM_GetClassNameUTF"); 2291 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2292 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2293 return k->name()->as_utf8(); 2294 JVM_END 2295 2296 2297 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2298 JVMWrapper("JVM_GetClassCPTypes"); 2299 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2300 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2301 // types will have length zero if this is not an InstanceKlass 2302 // (length is determined by call to JVM_GetClassCPEntriesCount) 2303 if (k->is_instance_klass()) { 2304 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2305 for (int index = cp->length() - 1; index >= 0; index--) { 2306 constantTag tag = cp->tag_at(index); 2307 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2308 } 2309 } 2310 JVM_END 2311 2312 2313 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2314 JVMWrapper("JVM_GetClassCPEntriesCount"); 2315 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2316 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2317 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2318 JVM_END 2319 2320 2321 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2322 JVMWrapper("JVM_GetClassFieldsCount"); 2323 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2324 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2325 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2326 JVM_END 2327 2328 2329 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2330 JVMWrapper("JVM_GetClassMethodsCount"); 2331 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2332 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2333 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2334 JVM_END 2335 2336 2337 // The following methods, used for the verifier, are never called with 2338 // array klasses, so a direct cast to InstanceKlass is safe. 2339 // Typically, these methods are called in a loop with bounds determined 2340 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2341 // zero for arrays. 2342 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2343 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2344 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2345 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2346 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2347 int length = method->checked_exceptions_length(); 2348 if (length > 0) { 2349 CheckedExceptionElement* table= method->checked_exceptions_start(); 2350 for (int i = 0; i < length; i++) { 2351 exceptions[i] = table[i].class_cp_index; 2352 } 2353 } 2354 JVM_END 2355 2356 2357 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2358 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2359 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2360 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2361 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2362 return method->checked_exceptions_length(); 2363 JVM_END 2364 2365 2366 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2367 JVMWrapper("JVM_GetMethodIxByteCode"); 2368 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2369 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2370 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2371 memcpy(code, method->code_base(), method->code_size()); 2372 JVM_END 2373 2374 2375 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2376 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2377 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2378 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2379 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2380 return method->code_size(); 2381 JVM_END 2382 2383 2384 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2385 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2386 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2387 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2388 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2389 ExceptionTable extable(method); 2390 entry->start_pc = extable.start_pc(entry_index); 2391 entry->end_pc = extable.end_pc(entry_index); 2392 entry->handler_pc = extable.handler_pc(entry_index); 2393 entry->catchType = extable.catch_type_index(entry_index); 2394 JVM_END 2395 2396 2397 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2398 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2399 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2400 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2401 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2402 return method->exception_table_length(); 2403 JVM_END 2404 2405 2406 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2407 JVMWrapper("JVM_GetMethodIxModifiers"); 2408 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2409 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2410 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2411 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2412 JVM_END 2413 2414 2415 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2416 JVMWrapper("JVM_GetFieldIxModifiers"); 2417 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2418 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2419 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2420 JVM_END 2421 2422 2423 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2424 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2425 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2426 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2427 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2428 return method->max_locals(); 2429 JVM_END 2430 2431 2432 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2433 JVMWrapper("JVM_GetMethodIxArgsSize"); 2434 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2435 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2436 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2437 return method->size_of_parameters(); 2438 JVM_END 2439 2440 2441 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2442 JVMWrapper("JVM_GetMethodIxMaxStack"); 2443 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2444 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2445 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2446 return method->verifier_max_stack(); 2447 JVM_END 2448 2449 2450 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2451 JVMWrapper("JVM_IsConstructorIx"); 2452 ResourceMark rm(THREAD); 2453 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2454 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2455 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2456 return method->name() == vmSymbols::object_initializer_name(); 2457 JVM_END 2458 2459 2460 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2461 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2462 ResourceMark rm(THREAD); 2463 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2464 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2465 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2466 return method->is_overpass(); 2467 JVM_END 2468 2469 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2470 JVMWrapper("JVM_GetMethodIxIxUTF"); 2471 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2472 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2473 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2474 return method->name()->as_utf8(); 2475 JVM_END 2476 2477 2478 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2479 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2480 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2481 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2482 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2483 return method->signature()->as_utf8(); 2484 JVM_END 2485 2486 /** 2487 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2488 * read entries in the constant pool. Since the old verifier always 2489 * works on a copy of the code, it will not see any rewriting that 2490 * may possibly occur in the middle of verification. So it is important 2491 * that nothing it calls tries to use the cpCache instead of the raw 2492 * constant pool, so we must use cp->uncached_x methods when appropriate. 2493 */ 2494 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2495 JVMWrapper("JVM_GetCPFieldNameUTF"); 2496 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2497 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2498 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2499 switch (cp->tag_at(cp_index).value()) { 2500 case JVM_CONSTANT_Fieldref: 2501 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2502 default: 2503 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2504 } 2505 ShouldNotReachHere(); 2506 return NULL; 2507 JVM_END 2508 2509 2510 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2511 JVMWrapper("JVM_GetCPMethodNameUTF"); 2512 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2513 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2514 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2515 switch (cp->tag_at(cp_index).value()) { 2516 case JVM_CONSTANT_InterfaceMethodref: 2517 case JVM_CONSTANT_Methodref: 2518 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2519 default: 2520 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2521 } 2522 ShouldNotReachHere(); 2523 return NULL; 2524 JVM_END 2525 2526 2527 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2528 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2529 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2530 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2531 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2532 switch (cp->tag_at(cp_index).value()) { 2533 case JVM_CONSTANT_InterfaceMethodref: 2534 case JVM_CONSTANT_Methodref: 2535 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2536 default: 2537 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2538 } 2539 ShouldNotReachHere(); 2540 return NULL; 2541 JVM_END 2542 2543 2544 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2545 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2546 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2547 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2548 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2549 switch (cp->tag_at(cp_index).value()) { 2550 case JVM_CONSTANT_Fieldref: 2551 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2552 default: 2553 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2554 } 2555 ShouldNotReachHere(); 2556 return NULL; 2557 JVM_END 2558 2559 2560 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2561 JVMWrapper("JVM_GetCPClassNameUTF"); 2562 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2563 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2564 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2565 Symbol* classname = cp->klass_name_at(cp_index); 2566 return classname->as_utf8(); 2567 JVM_END 2568 2569 2570 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2571 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2572 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2573 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2574 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2575 switch (cp->tag_at(cp_index).value()) { 2576 case JVM_CONSTANT_Fieldref: { 2577 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2578 Symbol* classname = cp->klass_name_at(class_index); 2579 return classname->as_utf8(); 2580 } 2581 default: 2582 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2583 } 2584 ShouldNotReachHere(); 2585 return NULL; 2586 JVM_END 2587 2588 2589 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2590 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2591 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2592 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2593 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2594 switch (cp->tag_at(cp_index).value()) { 2595 case JVM_CONSTANT_Methodref: 2596 case JVM_CONSTANT_InterfaceMethodref: { 2597 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2598 Symbol* classname = cp->klass_name_at(class_index); 2599 return classname->as_utf8(); 2600 } 2601 default: 2602 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2603 } 2604 ShouldNotReachHere(); 2605 return NULL; 2606 JVM_END 2607 2608 2609 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2610 JVMWrapper("JVM_GetCPFieldModifiers"); 2611 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2612 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2613 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2614 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2615 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2616 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2617 switch (cp->tag_at(cp_index).value()) { 2618 case JVM_CONSTANT_Fieldref: { 2619 Symbol* name = cp->uncached_name_ref_at(cp_index); 2620 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2621 InstanceKlass* ik = InstanceKlass::cast(k_called); 2622 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2623 if (fs.name() == name && fs.signature() == signature) { 2624 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2625 } 2626 } 2627 return -1; 2628 } 2629 default: 2630 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2631 } 2632 ShouldNotReachHere(); 2633 return 0; 2634 JVM_END 2635 2636 2637 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2638 JVMWrapper("JVM_GetCPMethodModifiers"); 2639 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2640 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2641 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2642 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2643 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2644 switch (cp->tag_at(cp_index).value()) { 2645 case JVM_CONSTANT_Methodref: 2646 case JVM_CONSTANT_InterfaceMethodref: { 2647 Symbol* name = cp->uncached_name_ref_at(cp_index); 2648 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2649 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2650 int methods_count = methods->length(); 2651 for (int i = 0; i < methods_count; i++) { 2652 Method* method = methods->at(i); 2653 if (method->name() == name && method->signature() == signature) { 2654 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2655 } 2656 } 2657 return -1; 2658 } 2659 default: 2660 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2661 } 2662 ShouldNotReachHere(); 2663 return 0; 2664 JVM_END 2665 2666 2667 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2668 2669 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2670 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2671 JVM_END 2672 2673 2674 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2675 JVMWrapper("JVM_IsSameClassPackage"); 2676 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2677 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2678 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2679 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2680 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2681 JVM_END 2682 2683 // Printing support ////////////////////////////////////////////////// 2684 extern "C" { 2685 2686 ATTRIBUTE_PRINTF(3, 0) 2687 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2688 // see bug 4399518, 4417214 2689 if ((intptr_t)count <= 0) return -1; 2690 2691 int result = vsnprintf(str, count, fmt, args); 2692 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2693 // characters which would have been written had the buffer been large 2694 // enough; on Windows, it returns -1. We handle both cases here and 2695 // always return -1, and perform null termination. 2696 if ((result > 0 && (size_t)result >= count) || result == -1) { 2697 str[count - 1] = '\0'; 2698 result = -1; 2699 } 2700 2701 return result; 2702 } 2703 2704 ATTRIBUTE_PRINTF(3, 0) 2705 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2706 va_list args; 2707 int len; 2708 va_start(args, fmt); 2709 len = jio_vsnprintf(str, count, fmt, args); 2710 va_end(args); 2711 return len; 2712 } 2713 2714 ATTRIBUTE_PRINTF(2,3) 2715 int jio_fprintf(FILE* f, const char *fmt, ...) { 2716 int len; 2717 va_list args; 2718 va_start(args, fmt); 2719 len = jio_vfprintf(f, fmt, args); 2720 va_end(args); 2721 return len; 2722 } 2723 2724 ATTRIBUTE_PRINTF(2, 0) 2725 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2726 if (Arguments::vfprintf_hook() != NULL) { 2727 return Arguments::vfprintf_hook()(f, fmt, args); 2728 } else { 2729 return vfprintf(f, fmt, args); 2730 } 2731 } 2732 2733 ATTRIBUTE_PRINTF(1, 2) 2734 JNIEXPORT int jio_printf(const char *fmt, ...) { 2735 int len; 2736 va_list args; 2737 va_start(args, fmt); 2738 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2739 va_end(args); 2740 return len; 2741 } 2742 2743 2744 // HotSpot specific jio method 2745 void jio_print(const char* s) { 2746 // Try to make this function as atomic as possible. 2747 if (Arguments::vfprintf_hook() != NULL) { 2748 jio_fprintf(defaultStream::output_stream(), "%s", s); 2749 } else { 2750 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2751 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2752 } 2753 } 2754 2755 } // Extern C 2756 2757 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2758 2759 // In most of the JVM thread support functions we need to access the 2760 // thread through a ThreadsListHandle to prevent it from exiting and 2761 // being reclaimed while we try to operate on it. The exceptions to this 2762 // rule are when operating on the current thread, or if the monitor of 2763 // the target java.lang.Thread is locked at the Java level - in both 2764 // cases the target cannot exit. 2765 2766 static void thread_entry(JavaThread* thread, TRAPS) { 2767 HandleMark hm(THREAD); 2768 Handle obj(THREAD, thread->threadObj()); 2769 JavaValue result(T_VOID); 2770 JavaCalls::call_virtual(&result, 2771 obj, 2772 SystemDictionary::Thread_klass(), 2773 vmSymbols::run_method_name(), 2774 vmSymbols::void_method_signature(), 2775 THREAD); 2776 } 2777 2778 2779 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2780 JVMWrapper("JVM_StartThread"); 2781 JavaThread *native_thread = NULL; 2782 2783 // We cannot hold the Threads_lock when we throw an exception, 2784 // due to rank ordering issues. Example: we might need to grab the 2785 // Heap_lock while we construct the exception. 2786 bool throw_illegal_thread_state = false; 2787 2788 // We must release the Threads_lock before we can post a jvmti event 2789 // in Thread::start. 2790 { 2791 // Ensure that the C++ Thread and OSThread structures aren't freed before 2792 // we operate. 2793 MutexLocker mu(Threads_lock); 2794 2795 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2796 // re-starting an already started thread, so we should usually find 2797 // that the JavaThread is null. However for a JNI attached thread 2798 // there is a small window between the Thread object being created 2799 // (with its JavaThread set) and the update to its threadStatus, so we 2800 // have to check for this 2801 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2802 throw_illegal_thread_state = true; 2803 } else { 2804 // We could also check the stillborn flag to see if this thread was already stopped, but 2805 // for historical reasons we let the thread detect that itself when it starts running 2806 2807 jlong size = 2808 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2809 // Allocate the C++ Thread structure and create the native thread. The 2810 // stack size retrieved from java is 64-bit signed, but the constructor takes 2811 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2812 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2813 // - Avoid passing negative values which would result in really large stacks. 2814 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2815 size_t sz = size > 0 ? (size_t) size : 0; 2816 native_thread = new JavaThread(&thread_entry, sz); 2817 2818 // At this point it may be possible that no osthread was created for the 2819 // JavaThread due to lack of memory. Check for this situation and throw 2820 // an exception if necessary. Eventually we may want to change this so 2821 // that we only grab the lock if the thread was created successfully - 2822 // then we can also do this check and throw the exception in the 2823 // JavaThread constructor. 2824 if (native_thread->osthread() != NULL) { 2825 // Note: the current thread is not being used within "prepare". 2826 native_thread->prepare(jthread); 2827 } 2828 } 2829 } 2830 2831 if (throw_illegal_thread_state) { 2832 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2833 } 2834 2835 assert(native_thread != NULL, "Starting null thread?"); 2836 2837 if (native_thread->osthread() == NULL) { 2838 // No one should hold a reference to the 'native_thread'. 2839 native_thread->smr_delete(); 2840 if (JvmtiExport::should_post_resource_exhausted()) { 2841 JvmtiExport::post_resource_exhausted( 2842 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2843 os::native_thread_creation_failed_msg()); 2844 } 2845 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2846 os::native_thread_creation_failed_msg()); 2847 } 2848 2849 Thread::start(native_thread); 2850 2851 JVM_END 2852 2853 2854 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2855 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2856 // but is thought to be reliable and simple. In the case, where the receiver is the 2857 // same thread as the sender, no VM_Operation is needed. 2858 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2859 JVMWrapper("JVM_StopThread"); 2860 2861 // A nested ThreadsListHandle will grab the Threads_lock so create 2862 // tlh before we resolve throwable. 2863 ThreadsListHandle tlh(thread); 2864 oop java_throwable = JNIHandles::resolve(throwable); 2865 if (java_throwable == NULL) { 2866 THROW(vmSymbols::java_lang_NullPointerException()); 2867 } 2868 oop java_thread = NULL; 2869 JavaThread* receiver = NULL; 2870 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2871 Events::log_exception(thread, 2872 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2873 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2874 2875 if (is_alive) { 2876 // jthread refers to a live JavaThread. 2877 if (thread == receiver) { 2878 // Exception is getting thrown at self so no VM_Operation needed. 2879 THROW_OOP(java_throwable); 2880 } else { 2881 // Use a VM_Operation to throw the exception. 2882 Thread::send_async_exception(java_thread, java_throwable); 2883 } 2884 } else { 2885 // Either: 2886 // - target thread has not been started before being stopped, or 2887 // - target thread already terminated 2888 // We could read the threadStatus to determine which case it is 2889 // but that is overkill as it doesn't matter. We must set the 2890 // stillborn flag for the first case, and if the thread has already 2891 // exited setting this flag has no effect. 2892 java_lang_Thread::set_stillborn(java_thread); 2893 } 2894 JVM_END 2895 2896 2897 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2898 JVMWrapper("JVM_IsThreadAlive"); 2899 2900 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2901 return java_lang_Thread::is_alive(thread_oop); 2902 JVM_END 2903 2904 2905 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2906 JVMWrapper("JVM_SuspendThread"); 2907 2908 ThreadsListHandle tlh(thread); 2909 JavaThread* receiver = NULL; 2910 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2911 if (is_alive) { 2912 // jthread refers to a live JavaThread. 2913 { 2914 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2915 if (receiver->is_external_suspend()) { 2916 // Don't allow nested external suspend requests. We can't return 2917 // an error from this interface so just ignore the problem. 2918 return; 2919 } 2920 if (receiver->is_exiting()) { // thread is in the process of exiting 2921 return; 2922 } 2923 receiver->set_external_suspend(); 2924 } 2925 2926 // java_suspend() will catch threads in the process of exiting 2927 // and will ignore them. 2928 receiver->java_suspend(); 2929 2930 // It would be nice to have the following assertion in all the 2931 // time, but it is possible for a racing resume request to have 2932 // resumed this thread right after we suspended it. Temporarily 2933 // enable this assertion if you are chasing a different kind of 2934 // bug. 2935 // 2936 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2937 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2938 } 2939 JVM_END 2940 2941 2942 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2943 JVMWrapper("JVM_ResumeThread"); 2944 2945 ThreadsListHandle tlh(thread); 2946 JavaThread* receiver = NULL; 2947 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2948 if (is_alive) { 2949 // jthread refers to a live JavaThread. 2950 2951 // This is the original comment for this Threads_lock grab: 2952 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2953 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2954 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2955 // looks at it. 2956 // 2957 // The above comment dates back to when we had both internal and 2958 // external suspend APIs that shared a common underlying mechanism. 2959 // External suspend is now entirely cooperative and doesn't share 2960 // anything with internal suspend. That said, there are some 2961 // assumptions in the VM that an external resume grabs the 2962 // Threads_lock. We can't drop the Threads_lock grab here until we 2963 // resolve the assumptions that exist elsewhere. 2964 // 2965 MutexLocker ml(Threads_lock); 2966 receiver->java_resume(); 2967 } 2968 JVM_END 2969 2970 2971 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2972 JVMWrapper("JVM_SetThreadPriority"); 2973 2974 ThreadsListHandle tlh(thread); 2975 oop java_thread = NULL; 2976 JavaThread* receiver = NULL; 2977 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2978 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2979 2980 if (is_alive) { 2981 // jthread refers to a live JavaThread. 2982 Thread::set_priority(receiver, (ThreadPriority)prio); 2983 } 2984 // Implied else: If the JavaThread hasn't started yet, then the 2985 // priority set in the java.lang.Thread object above will be pushed 2986 // down when it does start. 2987 JVM_END 2988 2989 2990 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2991 JVMWrapper("JVM_Yield"); 2992 if (os::dont_yield()) return; 2993 HOTSPOT_THREAD_YIELD(); 2994 os::naked_yield(); 2995 JVM_END 2996 2997 2998 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2999 JVMWrapper("JVM_Sleep"); 3000 3001 if (millis < 0) { 3002 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3003 } 3004 3005 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 3006 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3007 } 3008 3009 // Save current thread state and restore it at the end of this block. 3010 // And set new thread state to SLEEPING. 3011 JavaThreadSleepState jtss(thread); 3012 3013 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3014 3015 EventThreadSleep event; 3016 3017 if (millis == 0) { 3018 os::naked_yield(); 3019 } else { 3020 ThreadState old_state = thread->osthread()->get_state(); 3021 thread->osthread()->set_state(SLEEPING); 3022 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3023 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3024 // us while we were sleeping. We do not overwrite those. 3025 if (!HAS_PENDING_EXCEPTION) { 3026 if (event.should_commit()) { 3027 event.set_time(millis); 3028 event.commit(); 3029 } 3030 HOTSPOT_THREAD_SLEEP_END(1); 3031 3032 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3033 // to properly restore the thread state. That's likely wrong. 3034 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3035 } 3036 } 3037 thread->osthread()->set_state(old_state); 3038 } 3039 if (event.should_commit()) { 3040 event.set_time(millis); 3041 event.commit(); 3042 } 3043 HOTSPOT_THREAD_SLEEP_END(0); 3044 JVM_END 3045 3046 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3047 JVMWrapper("JVM_CurrentThread"); 3048 oop jthread = thread->threadObj(); 3049 assert (thread != NULL, "no current thread!"); 3050 return JNIHandles::make_local(env, jthread); 3051 JVM_END 3052 3053 3054 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3055 JVMWrapper("JVM_CountStackFrames"); 3056 3057 uint32_t debug_bits = 0; 3058 ThreadsListHandle tlh(thread); 3059 JavaThread* receiver = NULL; 3060 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3061 int count = 0; 3062 if (is_alive) { 3063 // jthread refers to a live JavaThread. 3064 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) { 3065 // Count all java activation, i.e., number of vframes. 3066 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) { 3067 // Native frames are not counted. 3068 if (!vfst.method()->is_native()) count++; 3069 } 3070 } else { 3071 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3072 "this thread is not suspended"); 3073 } 3074 } 3075 // Implied else: if JavaThread is not alive simply return a count of 0. 3076 3077 return count; 3078 JVM_END 3079 3080 3081 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3082 JVMWrapper("JVM_Interrupt"); 3083 3084 ThreadsListHandle tlh(thread); 3085 JavaThread* receiver = NULL; 3086 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3087 if (is_alive) { 3088 // jthread refers to a live JavaThread. 3089 Thread::interrupt(receiver); 3090 } 3091 JVM_END 3092 3093 3094 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3095 JVMWrapper("JVM_IsInterrupted"); 3096 3097 ThreadsListHandle tlh(thread); 3098 JavaThread* receiver = NULL; 3099 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3100 if (is_alive) { 3101 // jthread refers to a live JavaThread. 3102 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0); 3103 } else { 3104 return JNI_FALSE; 3105 } 3106 JVM_END 3107 3108 3109 // Return true iff the current thread has locked the object passed in 3110 3111 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3112 JVMWrapper("JVM_HoldsLock"); 3113 assert(THREAD->is_Java_thread(), "sanity check"); 3114 if (obj == NULL) { 3115 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3116 } 3117 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3118 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3119 JVM_END 3120 3121 3122 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3123 JVMWrapper("JVM_DumpAllStacks"); 3124 VM_PrintThreads op; 3125 VMThread::execute(&op); 3126 if (JvmtiExport::should_post_data_dump()) { 3127 JvmtiExport::post_data_dump(); 3128 } 3129 JVM_END 3130 3131 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3132 JVMWrapper("JVM_SetNativeThreadName"); 3133 3134 // We don't use a ThreadsListHandle here because the current thread 3135 // must be alive. 3136 oop java_thread = JNIHandles::resolve_non_null(jthread); 3137 JavaThread* thr = java_lang_Thread::thread(java_thread); 3138 if (thread == thr && !thr->has_attached_via_jni()) { 3139 // Thread naming is only supported for the current thread and 3140 // we don't set the name of an attached thread to avoid stepping 3141 // on other programs. 3142 ResourceMark rm(thread); 3143 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3144 os::set_native_thread_name(thread_name); 3145 } 3146 JVM_END 3147 3148 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3149 3150 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3151 assert(jthread->is_Java_thread(), "must be a Java thread"); 3152 if (jthread->privileged_stack_top() == NULL) return false; 3153 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3154 oop loader = jthread->privileged_stack_top()->class_loader(); 3155 if (loader == NULL) return true; 3156 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3157 if (trusted) return true; 3158 } 3159 return false; 3160 } 3161 3162 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3163 JVMWrapper("JVM_CurrentLoadedClass"); 3164 ResourceMark rm(THREAD); 3165 3166 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3167 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3168 bool trusted = is_trusted_frame(thread, &vfst); 3169 if (trusted) return NULL; 3170 3171 Method* m = vfst.method(); 3172 if (!m->is_native()) { 3173 InstanceKlass* holder = m->method_holder(); 3174 oop loader = holder->class_loader(); 3175 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3176 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3177 } 3178 } 3179 } 3180 return NULL; 3181 JVM_END 3182 3183 3184 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3185 JVMWrapper("JVM_CurrentClassLoader"); 3186 ResourceMark rm(THREAD); 3187 3188 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3189 3190 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3191 bool trusted = is_trusted_frame(thread, &vfst); 3192 if (trusted) return NULL; 3193 3194 Method* m = vfst.method(); 3195 if (!m->is_native()) { 3196 InstanceKlass* holder = m->method_holder(); 3197 assert(holder->is_klass(), "just checking"); 3198 oop loader = holder->class_loader(); 3199 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3200 return JNIHandles::make_local(env, loader); 3201 } 3202 } 3203 } 3204 return NULL; 3205 JVM_END 3206 3207 3208 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3209 JVMWrapper("JVM_GetClassContext"); 3210 ResourceMark rm(THREAD); 3211 JvmtiVMObjectAllocEventCollector oam; 3212 vframeStream vfst(thread); 3213 3214 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3215 // This must only be called from SecurityManager.getClassContext 3216 Method* m = vfst.method(); 3217 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3218 m->name() == vmSymbols::getClassContext_name() && 3219 m->signature() == vmSymbols::void_class_array_signature())) { 3220 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3221 } 3222 } 3223 3224 // Collect method holders 3225 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3226 for (; !vfst.at_end(); vfst.security_next()) { 3227 Method* m = vfst.method(); 3228 // Native frames are not returned 3229 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3230 Klass* holder = m->method_holder(); 3231 assert(holder->is_klass(), "just checking"); 3232 klass_array->append(holder); 3233 } 3234 } 3235 3236 // Create result array of type [Ljava/lang/Class; 3237 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3238 // Fill in mirrors corresponding to method holders 3239 for (int i = 0; i < klass_array->length(); i++) { 3240 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3241 } 3242 3243 return (jobjectArray) JNIHandles::make_local(env, result); 3244 JVM_END 3245 3246 3247 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3248 JVMWrapper("JVM_ClassDepth"); 3249 ResourceMark rm(THREAD); 3250 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3251 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3252 3253 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3254 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3255 if (class_name_sym == NULL) { 3256 return -1; 3257 } 3258 3259 int depth = 0; 3260 3261 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3262 if (!vfst.method()->is_native()) { 3263 InstanceKlass* holder = vfst.method()->method_holder(); 3264 assert(holder->is_klass(), "just checking"); 3265 if (holder->name() == class_name_sym) { 3266 return depth; 3267 } 3268 depth++; 3269 } 3270 } 3271 return -1; 3272 JVM_END 3273 3274 3275 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3276 JVMWrapper("JVM_ClassLoaderDepth"); 3277 ResourceMark rm(THREAD); 3278 int depth = 0; 3279 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3280 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3281 bool trusted = is_trusted_frame(thread, &vfst); 3282 if (trusted) return -1; 3283 3284 Method* m = vfst.method(); 3285 if (!m->is_native()) { 3286 InstanceKlass* holder = m->method_holder(); 3287 assert(holder->is_klass(), "just checking"); 3288 oop loader = holder->class_loader(); 3289 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3290 return depth; 3291 } 3292 depth++; 3293 } 3294 } 3295 return -1; 3296 JVM_END 3297 3298 3299 // java.lang.Package //////////////////////////////////////////////////////////////// 3300 3301 3302 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3303 JVMWrapper("JVM_GetSystemPackage"); 3304 ResourceMark rm(THREAD); 3305 JvmtiVMObjectAllocEventCollector oam; 3306 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3307 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3308 return (jstring) JNIHandles::make_local(result); 3309 JVM_END 3310 3311 3312 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3313 JVMWrapper("JVM_GetSystemPackages"); 3314 JvmtiVMObjectAllocEventCollector oam; 3315 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3316 return (jobjectArray) JNIHandles::make_local(result); 3317 JVM_END 3318 3319 3320 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3321 3322 3323 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3324 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3325 3326 MonitorLockerEx ml(Heap_lock); 3327 oop ref = Universe::reference_pending_list(); 3328 if (ref != NULL) { 3329 Universe::set_reference_pending_list(NULL); 3330 } 3331 return JNIHandles::make_local(env, ref); 3332 JVM_END 3333 3334 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3335 JVMWrapper("JVM_HasReferencePendingList"); 3336 MonitorLockerEx ml(Heap_lock); 3337 return Universe::has_reference_pending_list(); 3338 JVM_END 3339 3340 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3341 JVMWrapper("JVM_WaitForReferencePendingList"); 3342 MonitorLockerEx ml(Heap_lock); 3343 while (!Universe::has_reference_pending_list()) { 3344 ml.wait(); 3345 } 3346 JVM_END 3347 3348 3349 // ObjectInputStream /////////////////////////////////////////////////////////////// 3350 3351 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3352 if (current_class == NULL) { 3353 return true; 3354 } 3355 if ((current_class == field_class) || access.is_public()) { 3356 return true; 3357 } 3358 3359 if (access.is_protected()) { 3360 // See if current_class is a subclass of field_class 3361 if (current_class->is_subclass_of(field_class)) { 3362 return true; 3363 } 3364 } 3365 3366 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3367 } 3368 3369 // Return the first user-defined class loader up the execution stack, or null 3370 // if only code from the bootstrap or platform class loader is on the stack. 3371 3372 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3373 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3374 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3375 oop loader = vfst.method()->method_holder()->class_loader(); 3376 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3377 return JNIHandles::make_local(env, loader); 3378 } 3379 } 3380 return NULL; 3381 JVM_END 3382 3383 3384 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3385 3386 3387 // resolve array handle and check arguments 3388 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3389 if (arr == NULL) { 3390 THROW_0(vmSymbols::java_lang_NullPointerException()); 3391 } 3392 oop a = JNIHandles::resolve_non_null(arr); 3393 if (!a->is_array()) { 3394 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3395 } else if (type_array_only && !a->is_typeArray()) { 3396 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3397 } 3398 return arrayOop(a); 3399 } 3400 3401 3402 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3403 JVMWrapper("JVM_GetArrayLength"); 3404 arrayOop a = check_array(env, arr, false, CHECK_0); 3405 return a->length(); 3406 JVM_END 3407 3408 3409 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3410 JVMWrapper("JVM_Array_Get"); 3411 JvmtiVMObjectAllocEventCollector oam; 3412 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3413 jvalue value; 3414 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3415 oop box = Reflection::box(&value, type, CHECK_NULL); 3416 return JNIHandles::make_local(env, box); 3417 JVM_END 3418 3419 3420 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3421 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3422 jvalue value; 3423 value.i = 0; // to initialize value before getting used in CHECK 3424 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3425 assert(a->is_typeArray(), "just checking"); 3426 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3427 BasicType wide_type = (BasicType) wCode; 3428 if (type != wide_type) { 3429 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3430 } 3431 return value; 3432 JVM_END 3433 3434 3435 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3436 JVMWrapper("JVM_SetArrayElement"); 3437 arrayOop a = check_array(env, arr, false, CHECK); 3438 oop box = JNIHandles::resolve(val); 3439 jvalue value; 3440 value.i = 0; // to initialize value before getting used in CHECK 3441 BasicType value_type; 3442 if (a->is_objArray()) { 3443 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3444 value_type = Reflection::unbox_for_regular_object(box, &value); 3445 } else { 3446 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3447 } 3448 Reflection::array_set(&value, a, index, value_type, CHECK); 3449 JVM_END 3450 3451 3452 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3453 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3454 arrayOop a = check_array(env, arr, true, CHECK); 3455 assert(a->is_typeArray(), "just checking"); 3456 BasicType value_type = (BasicType) vCode; 3457 Reflection::array_set(&v, a, index, value_type, CHECK); 3458 JVM_END 3459 3460 3461 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3462 JVMWrapper("JVM_NewArray"); 3463 JvmtiVMObjectAllocEventCollector oam; 3464 oop element_mirror = JNIHandles::resolve(eltClass); 3465 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3466 return JNIHandles::make_local(env, result); 3467 JVM_END 3468 3469 3470 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3471 JVMWrapper("JVM_NewMultiArray"); 3472 JvmtiVMObjectAllocEventCollector oam; 3473 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3474 oop element_mirror = JNIHandles::resolve(eltClass); 3475 assert(dim_array->is_typeArray(), "just checking"); 3476 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3477 return JNIHandles::make_local(env, result); 3478 JVM_END 3479 3480 3481 // Library support /////////////////////////////////////////////////////////////////////////// 3482 3483 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3484 //%note jvm_ct 3485 JVMWrapper("JVM_LoadLibrary"); 3486 char ebuf[1024]; 3487 void *load_result; 3488 { 3489 ThreadToNativeFromVM ttnfvm(thread); 3490 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3491 } 3492 if (load_result == NULL) { 3493 char msg[1024]; 3494 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3495 // Since 'ebuf' may contain a string encoded using 3496 // platform encoding scheme, we need to pass 3497 // Exceptions::unsafe_to_utf8 to the new_exception method 3498 // as the last argument. See bug 6367357. 3499 Handle h_exception = 3500 Exceptions::new_exception(thread, 3501 vmSymbols::java_lang_UnsatisfiedLinkError(), 3502 msg, Exceptions::unsafe_to_utf8); 3503 3504 THROW_HANDLE_0(h_exception); 3505 } 3506 return load_result; 3507 JVM_END 3508 3509 3510 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3511 JVMWrapper("JVM_UnloadLibrary"); 3512 os::dll_unload(handle); 3513 JVM_END 3514 3515 3516 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3517 JVMWrapper("JVM_FindLibraryEntry"); 3518 return os::dll_lookup(handle, name); 3519 JVM_END 3520 3521 3522 // JNI version /////////////////////////////////////////////////////////////////////////////// 3523 3524 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3525 JVMWrapper("JVM_IsSupportedJNIVersion"); 3526 return Threads::is_supported_jni_version_including_1_1(version); 3527 JVM_END 3528 3529 3530 // String support /////////////////////////////////////////////////////////////////////////// 3531 3532 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3533 JVMWrapper("JVM_InternString"); 3534 JvmtiVMObjectAllocEventCollector oam; 3535 if (str == NULL) return NULL; 3536 oop string = JNIHandles::resolve_non_null(str); 3537 oop result = StringTable::intern(string, CHECK_NULL); 3538 return (jstring) JNIHandles::make_local(env, result); 3539 JVM_END 3540 3541 3542 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3543 3544 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3545 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3546 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3547 // that only works with java threads. 3548 3549 3550 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3551 VM_Exit::block_if_vm_exited(); 3552 JVMWrapper("JVM_RawMonitorCreate"); 3553 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3554 } 3555 3556 3557 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3558 VM_Exit::block_if_vm_exited(); 3559 JVMWrapper("JVM_RawMonitorDestroy"); 3560 delete ((Mutex*) mon); 3561 } 3562 3563 3564 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3565 VM_Exit::block_if_vm_exited(); 3566 JVMWrapper("JVM_RawMonitorEnter"); 3567 ((Mutex*) mon)->jvm_raw_lock(); 3568 return 0; 3569 } 3570 3571 3572 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3573 VM_Exit::block_if_vm_exited(); 3574 JVMWrapper("JVM_RawMonitorExit"); 3575 ((Mutex*) mon)->jvm_raw_unlock(); 3576 } 3577 3578 3579 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3580 3581 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3582 Handle loader, Handle protection_domain, 3583 jboolean throwError, TRAPS) { 3584 // Security Note: 3585 // The Java level wrapper will perform the necessary security check allowing 3586 // us to pass the NULL as the initiating class loader. The VM is responsible for 3587 // the checkPackageAccess relative to the initiating class loader via the 3588 // protection_domain. The protection_domain is passed as NULL by the java code 3589 // if there is no security manager in 3-arg Class.forName(). 3590 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3591 3592 // Check if we should initialize the class 3593 if (init && klass->is_instance_klass()) { 3594 klass->initialize(CHECK_NULL); 3595 } 3596 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3597 } 3598 3599 3600 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3601 3602 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3603 JVMWrapper("JVM_InvokeMethod"); 3604 Handle method_handle; 3605 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3606 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3607 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3608 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3609 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3610 jobject res = JNIHandles::make_local(env, result); 3611 if (JvmtiExport::should_post_vm_object_alloc()) { 3612 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3613 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3614 if (java_lang_Class::is_primitive(ret_type)) { 3615 // Only for primitive type vm allocates memory for java object. 3616 // See box() method. 3617 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3618 } 3619 } 3620 return res; 3621 } else { 3622 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3623 } 3624 JVM_END 3625 3626 3627 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3628 JVMWrapper("JVM_NewInstanceFromConstructor"); 3629 oop constructor_mirror = JNIHandles::resolve(c); 3630 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3631 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3632 jobject res = JNIHandles::make_local(env, result); 3633 if (JvmtiExport::should_post_vm_object_alloc()) { 3634 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3635 } 3636 return res; 3637 JVM_END 3638 3639 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3640 3641 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3642 JVMWrapper("JVM_SupportsCX8"); 3643 return VM_Version::supports_cx8(); 3644 JVM_END 3645 3646 // Returns an array of all live Thread objects (VM internal JavaThreads, 3647 // jvmti agent threads, and JNI attaching threads are skipped) 3648 // See CR 6404306 regarding JNI attaching threads 3649 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3650 ResourceMark rm(THREAD); 3651 ThreadsListEnumerator tle(THREAD, false, false); 3652 JvmtiVMObjectAllocEventCollector oam; 3653 3654 int num_threads = tle.num_threads(); 3655 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3656 objArrayHandle threads_ah(THREAD, r); 3657 3658 for (int i = 0; i < num_threads; i++) { 3659 Handle h = tle.get_threadObj(i); 3660 threads_ah->obj_at_put(i, h()); 3661 } 3662 3663 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3664 JVM_END 3665 3666 3667 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3668 // Return StackTraceElement[][], each element is the stack trace of a thread in 3669 // the corresponding entry in the given threads array 3670 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3671 JVMWrapper("JVM_DumpThreads"); 3672 JvmtiVMObjectAllocEventCollector oam; 3673 3674 // Check if threads is null 3675 if (threads == NULL) { 3676 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3677 } 3678 3679 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3680 objArrayHandle ah(THREAD, a); 3681 int num_threads = ah->length(); 3682 // check if threads is non-empty array 3683 if (num_threads == 0) { 3684 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3685 } 3686 3687 // check if threads is not an array of objects of Thread class 3688 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3689 if (k != SystemDictionary::Thread_klass()) { 3690 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3691 } 3692 3693 ResourceMark rm(THREAD); 3694 3695 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3696 for (int i = 0; i < num_threads; i++) { 3697 oop thread_obj = ah->obj_at(i); 3698 instanceHandle h(THREAD, (instanceOop) thread_obj); 3699 thread_handle_array->append(h); 3700 } 3701 3702 // The JavaThread references in thread_handle_array are validated 3703 // in VM_ThreadDump::doit(). 3704 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3705 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3706 3707 JVM_END 3708 3709 // JVM monitoring and management support 3710 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3711 return Management::get_jmm_interface(version); 3712 JVM_END 3713 3714 // com.sun.tools.attach.VirtualMachine agent properties support 3715 // 3716 // Initialize the agent properties with the properties maintained in the VM 3717 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3718 JVMWrapper("JVM_InitAgentProperties"); 3719 ResourceMark rm; 3720 3721 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3722 3723 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3724 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3725 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3726 return properties; 3727 JVM_END 3728 3729 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3730 { 3731 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3732 JvmtiVMObjectAllocEventCollector oam; 3733 3734 if (ofClass == NULL) { 3735 return NULL; 3736 } 3737 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3738 // Special handling for primitive objects 3739 if (java_lang_Class::is_primitive(mirror())) { 3740 return NULL; 3741 } 3742 Klass* k = java_lang_Class::as_Klass(mirror()); 3743 if (!k->is_instance_klass()) { 3744 return NULL; 3745 } 3746 InstanceKlass* ik = InstanceKlass::cast(k); 3747 int encl_method_class_idx = ik->enclosing_method_class_index(); 3748 if (encl_method_class_idx == 0) { 3749 return NULL; 3750 } 3751 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3752 objArrayHandle dest(THREAD, dest_o); 3753 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3754 dest->obj_at_put(0, enc_k->java_mirror()); 3755 int encl_method_method_idx = ik->enclosing_method_method_index(); 3756 if (encl_method_method_idx != 0) { 3757 Symbol* sym = ik->constants()->symbol_at( 3758 extract_low_short_from_int( 3759 ik->constants()->name_and_type_at(encl_method_method_idx))); 3760 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3761 dest->obj_at_put(1, str()); 3762 sym = ik->constants()->symbol_at( 3763 extract_high_short_from_int( 3764 ik->constants()->name_and_type_at(encl_method_method_idx))); 3765 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3766 dest->obj_at_put(2, str()); 3767 } 3768 return (jobjectArray) JNIHandles::make_local(dest()); 3769 } 3770 JVM_END 3771 3772 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3773 { 3774 memset(info, 0, info_size); 3775 3776 info->jvm_version = Abstract_VM_Version::jvm_version(); 3777 info->patch_version = Abstract_VM_Version::vm_patch_version(); 3778 3779 // when we add a new capability in the jvm_version_info struct, we should also 3780 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3781 // counter defined in runtimeService.cpp. 3782 info->is_attachable = AttachListener::is_attach_supported(); 3783 } 3784 JVM_END 3785 3786 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3787 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3788 ResourceMark rm(THREAD); 3789 3790 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3791 return NULL; 3792 } 3793 3794 char** vm_flags = Arguments::jvm_flags_array(); 3795 char** vm_args = Arguments::jvm_args_array(); 3796 int num_flags = Arguments::num_jvm_flags(); 3797 int num_args = Arguments::num_jvm_args(); 3798 3799 InstanceKlass* ik = SystemDictionary::String_klass(); 3800 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3801 objArrayHandle result_h(THREAD, r); 3802 3803 int index = 0; 3804 for (int j = 0; j < num_flags; j++, index++) { 3805 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3806 result_h->obj_at_put(index, h()); 3807 } 3808 for (int i = 0; i < num_args; i++, index++) { 3809 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3810 result_h->obj_at_put(index, h()); 3811 } 3812 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3813 JVM_END 3814 3815 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3816 return os::get_signal_number(name); 3817 JVM_END