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