1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classFileStream.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/classLoaderData.inline.hpp" 29 #include "classfile/javaAssertions.hpp" 30 #include "classfile/javaClasses.inline.hpp" 31 #include "classfile/moduleEntry.hpp" 32 #include "classfile/modules.hpp" 33 #include "classfile/packageEntry.hpp" 34 #include "classfile/stringTable.hpp" 35 #include "classfile/systemDictionary.hpp" 36 #include "classfile/vmSymbols.hpp" 37 #include "gc/shared/barrierSet.inline.hpp" 38 #include "gc/shared/collectedHeap.inline.hpp" 39 #include "interpreter/bytecode.hpp" 40 #include "memory/oopFactory.hpp" 41 #include "memory/resourceArea.hpp" 42 #include "memory/universe.inline.hpp" 43 #include "oops/fieldStreams.hpp" 44 #include "oops/instanceKlass.hpp" 45 #include "oops/method.hpp" 46 #include "oops/objArrayKlass.hpp" 47 #include "oops/objArrayOop.inline.hpp" 48 #include "oops/oop.inline.hpp" 49 #include "prims/jvm.h" 50 #include "prims/jvm_misc.hpp" 51 #include "prims/jvmtiExport.hpp" 52 #include "prims/jvmtiThreadState.hpp" 53 #include "prims/nativeLookup.hpp" 54 #include "prims/privilegedStack.hpp" 55 #include "prims/stackwalk.hpp" 56 #include "runtime/arguments.hpp" 57 #include "runtime/atomic.hpp" 58 #include "runtime/handles.inline.hpp" 59 #include "runtime/init.hpp" 60 #include "runtime/interfaceSupport.hpp" 61 #include "runtime/java.hpp" 62 #include "runtime/javaCalls.hpp" 63 #include "runtime/jfieldIDWorkaround.hpp" 64 #include "runtime/orderAccess.inline.hpp" 65 #include "runtime/os.inline.hpp" 66 #include "runtime/perfData.hpp" 67 #include "runtime/reflection.hpp" 68 #include "runtime/thread.inline.hpp" 69 #include "runtime/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 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread 656 // is modifying a reference field in the clonee, a non-oop-atomic copy might 657 // be suspended in the middle of copying the pointer and end up with parts 658 // of two different pointers in the field. Subsequent dereferences will crash. 659 // 4846409: an oop-copy of objects with long or double fields or arrays of same 660 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead 661 // of oops. We know objects are aligned on a minimum of an jlong boundary. 662 // The same is true of StubRoutines::object_copy and the various oop_copy 663 // variants, and of the code generated by the inline_native_clone intrinsic. 664 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); 665 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop, 666 (size_t)align_object_size(size) / HeapWordsPerLong); 667 // Clear the header 668 new_obj_oop->init_mark(); 669 670 // Store check (mark entire object and let gc sort it out) 671 BarrierSet* bs = Universe::heap()->barrier_set(); 672 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); 673 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); 674 675 Handle new_obj(THREAD, new_obj_oop); 676 // Special handling for MemberNames. Since they contain Method* metadata, they 677 // must be registered so that RedefineClasses can fix metadata contained in them. 678 if (java_lang_invoke_MemberName::is_instance(new_obj()) && 679 java_lang_invoke_MemberName::is_method(new_obj())) { 680 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj()); 681 // MemberName may be unresolved, so doesn't need registration until resolved. 682 if (method != NULL) { 683 methodHandle m(THREAD, method); 684 // This can safepoint and redefine method, so need both new_obj and method 685 // in a handle, for two different reasons. new_obj can move, method can be 686 // deleted if nothing is using it on the stack. 687 m->method_holder()->add_member_name(new_obj, false); 688 } 689 } 690 691 // Caution: this involves a java upcall, so the clone should be 692 // "gc-robust" by this stage. 693 if (klass->has_finalizer()) { 694 assert(obj->is_instance(), "should be instanceOop"); 695 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 696 new_obj = Handle(THREAD, new_obj_oop); 697 } 698 699 return JNIHandles::make_local(env, new_obj()); 700 JVM_END 701 702 // java.io.File /////////////////////////////////////////////////////////////// 703 704 JVM_LEAF(char*, JVM_NativePath(char* path)) 705 JVMWrapper("JVM_NativePath"); 706 return os::native_path(path); 707 JVM_END 708 709 710 // Misc. class handling /////////////////////////////////////////////////////////// 711 712 713 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 714 JVMWrapper("JVM_GetCallerClass"); 715 716 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 717 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 718 // temporarily for existing code to use until a replacement API is defined. 719 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 720 Klass* k = thread->security_get_caller_class(depth); 721 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 722 } 723 724 // Getting the class of the caller frame. 725 // 726 // The call stack at this point looks something like this: 727 // 728 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 729 // [1] [ @CallerSensitive API.method ] 730 // [.] [ (skipped intermediate frames) ] 731 // [n] [ caller ] 732 vframeStream vfst(thread); 733 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 734 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 735 Method* m = vfst.method(); 736 assert(m != NULL, "sanity"); 737 switch (n) { 738 case 0: 739 // This must only be called from Reflection.getCallerClass 740 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 741 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 742 } 743 // fall-through 744 case 1: 745 // Frame 0 and 1 must be caller sensitive. 746 if (!m->caller_sensitive()) { 747 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 748 } 749 break; 750 default: 751 if (!m->is_ignored_by_security_stack_walk()) { 752 // We have reached the desired frame; return the holder class. 753 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 754 } 755 break; 756 } 757 } 758 return NULL; 759 JVM_END 760 761 762 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 763 JVMWrapper("JVM_FindPrimitiveClass"); 764 oop mirror = NULL; 765 BasicType t = name2type(utf); 766 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 767 mirror = Universe::java_mirror(t); 768 } 769 if (mirror == NULL) { 770 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 771 } else { 772 return (jclass) JNIHandles::make_local(env, mirror); 773 } 774 JVM_END 775 776 777 // Returns a class loaded by the bootstrap class loader; or null 778 // if not found. ClassNotFoundException is not thrown. 779 // FindClassFromBootLoader is exported to the launcher for windows. 780 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 781 const char* name)) 782 JVMWrapper("JVM_FindClassFromBootLoader"); 783 784 // Java libraries should ensure that name is never null... 785 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 786 // It's impossible to create this class; the name cannot fit 787 // into the constant pool. 788 return NULL; 789 } 790 791 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 792 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 793 if (k == NULL) { 794 return NULL; 795 } 796 797 if (log_is_enabled(Debug, class, resolve)) { 798 trace_class_resolution(k); 799 } 800 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 801 JVM_END 802 803 // Find a class with this name in this loader, using the caller's protection domain. 804 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 805 jboolean init, jobject loader, 806 jclass caller)) 807 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 808 // Java libraries should ensure that name is never null... 809 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 810 // It's impossible to create this class; the name cannot fit 811 // into the constant pool. 812 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 813 } 814 815 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 816 817 oop loader_oop = JNIHandles::resolve(loader); 818 oop from_class = JNIHandles::resolve(caller); 819 oop protection_domain = NULL; 820 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 821 // NPE. Put it in another way, the bootstrap class loader has all permission and 822 // thus no checkPackageAccess equivalence in the VM class loader. 823 // The caller is also passed as NULL by the java code if there is no security 824 // manager to avoid the performance cost of getting the calling class. 825 if (from_class != NULL && loader_oop != NULL) { 826 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 827 } 828 829 Handle h_loader(THREAD, loader_oop); 830 Handle h_prot(THREAD, protection_domain); 831 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 832 h_prot, false, THREAD); 833 834 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 835 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 836 } 837 return result; 838 JVM_END 839 840 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 841 jboolean init, jclass from)) 842 JVMWrapper("JVM_FindClassFromClass"); 843 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 844 // It's impossible to create this class; the name cannot fit 845 // into the constant pool. 846 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 847 } 848 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 849 oop from_class_oop = JNIHandles::resolve(from); 850 Klass* from_class = (from_class_oop == NULL) 851 ? (Klass*)NULL 852 : java_lang_Class::as_Klass(from_class_oop); 853 oop class_loader = NULL; 854 oop protection_domain = NULL; 855 if (from_class != NULL) { 856 class_loader = from_class->class_loader(); 857 protection_domain = from_class->protection_domain(); 858 } 859 Handle h_loader(THREAD, class_loader); 860 Handle h_prot (THREAD, protection_domain); 861 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 862 h_prot, true, thread); 863 864 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 865 // this function is generally only used for class loading during verification. 866 ResourceMark rm; 867 oop from_mirror = JNIHandles::resolve_non_null(from); 868 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 869 const char * from_name = from_class->external_name(); 870 871 oop mirror = JNIHandles::resolve_non_null(result); 872 Klass* to_class = java_lang_Class::as_Klass(mirror); 873 const char * to = to_class->external_name(); 874 log_debug(class, resolve)("%s %s (verification)", from_name, to); 875 } 876 877 return result; 878 JVM_END 879 880 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 881 if (loader.is_null()) { 882 return; 883 } 884 885 // check whether the current caller thread holds the lock or not. 886 // If not, increment the corresponding counter 887 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 888 ObjectSynchronizer::owner_self) { 889 counter->inc(); 890 } 891 } 892 893 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 894 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 895 jobject loader, const jbyte *buf, 896 jsize len, jobject pd, const char *source, 897 TRAPS) { 898 if (source == NULL) source = "__JVM_DefineClass__"; 899 900 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 901 JavaThread* jt = (JavaThread*) THREAD; 902 903 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 904 ClassLoader::perf_define_appclass_selftime(), 905 ClassLoader::perf_define_appclasses(), 906 jt->get_thread_stat()->perf_recursion_counts_addr(), 907 jt->get_thread_stat()->perf_timers_addr(), 908 PerfClassTraceTime::DEFINE_CLASS); 909 910 if (UsePerfData) { 911 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 912 } 913 914 // Since exceptions can be thrown, class initialization can take place 915 // if name is NULL no check for class name in .class stream has to be made. 916 TempNewSymbol class_name = NULL; 917 if (name != NULL) { 918 const int str_len = (int)strlen(name); 919 if (str_len > Symbol::max_length()) { 920 // It's impossible to create this class; the name cannot fit 921 // into the constant pool. 922 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 923 } 924 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 925 } 926 927 ResourceMark rm(THREAD); 928 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 929 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 930 if (UsePerfData) { 931 is_lock_held_by_thread(class_loader, 932 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 933 THREAD); 934 } 935 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 936 Klass* k = SystemDictionary::resolve_from_stream(class_name, 937 class_loader, 938 protection_domain, 939 &st, 940 CHECK_NULL); 941 942 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 943 trace_class_resolution(k); 944 } 945 946 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 947 } 948 949 950 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 951 JVMWrapper("JVM_DefineClass"); 952 953 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 954 JVM_END 955 956 957 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 958 JVMWrapper("JVM_DefineClassWithSource"); 959 960 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 961 JVM_END 962 963 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 964 JVMWrapper("JVM_FindLoadedClass"); 965 ResourceMark rm(THREAD); 966 967 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 968 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 969 970 const char* str = java_lang_String::as_utf8_string(string()); 971 // Sanity check, don't expect null 972 if (str == NULL) return NULL; 973 974 const int str_len = (int)strlen(str); 975 if (str_len > Symbol::max_length()) { 976 // It's impossible to create this class; the name cannot fit 977 // into the constant pool. 978 return NULL; 979 } 980 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 981 982 // Security Note: 983 // The Java level wrapper will perform the necessary security check allowing 984 // us to pass the NULL as the initiating class loader. 985 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 986 if (UsePerfData) { 987 is_lock_held_by_thread(h_loader, 988 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 989 THREAD); 990 } 991 992 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 993 h_loader, 994 Handle(), 995 CHECK_NULL); 996 #if INCLUDE_CDS 997 if (k == NULL) { 998 // If the class is not already loaded, try to see if it's in the shared 999 // archive for the current classloader (h_loader). 1000 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1001 } 1002 #endif 1003 return (k == NULL) ? NULL : 1004 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1005 JVM_END 1006 1007 // Module support ////////////////////////////////////////////////////////////////////////////// 1008 1009 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1010 jstring location, const char* const* packages, jsize num_packages)) 1011 JVMWrapper("JVM_DefineModule"); 1012 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1013 JVM_END 1014 1015 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1016 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1017 Modules::set_bootloader_unnamed_module(module, CHECK); 1018 JVM_END 1019 1020 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1021 JVMWrapper("JVM_AddModuleExports"); 1022 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1023 JVM_END 1024 1025 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1026 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1027 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1028 JVM_END 1029 1030 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1031 JVMWrapper("JVM_AddModuleExportsToAll"); 1032 Modules::add_module_exports(from_module, package, NULL, CHECK); 1033 JVM_END 1034 1035 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1036 JVMWrapper("JVM_AddReadsModule"); 1037 Modules::add_reads_module(from_module, source_module, CHECK); 1038 JVM_END 1039 1040 JVM_ENTRY (void, JVM_AddModulePackage(JNIEnv *env, jobject module, const char* package)) 1041 JVMWrapper("JVM_AddModulePackage"); 1042 Modules::add_module_package(module, package, CHECK); 1043 JVM_END 1044 1045 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1046 1047 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1048 assert (cls != NULL, "illegal class"); 1049 JVMWrapper("JVM_GetClassName"); 1050 JvmtiVMObjectAllocEventCollector oam; 1051 ResourceMark rm(THREAD); 1052 const char* name; 1053 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1054 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1055 } else { 1056 // Consider caching interned string in Klass 1057 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1058 assert(k->is_klass(), "just checking"); 1059 name = k->external_name(); 1060 } 1061 oop result = StringTable::intern((char*) name, CHECK_NULL); 1062 return (jstring) JNIHandles::make_local(env, result); 1063 JVM_END 1064 1065 1066 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1067 JVMWrapper("JVM_GetClassInterfaces"); 1068 JvmtiVMObjectAllocEventCollector oam; 1069 oop mirror = JNIHandles::resolve_non_null(cls); 1070 1071 // Special handling for primitive objects 1072 if (java_lang_Class::is_primitive(mirror)) { 1073 // Primitive objects does not have any interfaces 1074 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1075 return (jobjectArray) JNIHandles::make_local(env, r); 1076 } 1077 1078 Klass* klass = java_lang_Class::as_Klass(mirror); 1079 // Figure size of result array 1080 int size; 1081 if (klass->is_instance_klass()) { 1082 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1083 } else { 1084 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1085 size = 2; 1086 } 1087 1088 // Allocate result array 1089 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1090 objArrayHandle result (THREAD, r); 1091 // Fill in result 1092 if (klass->is_instance_klass()) { 1093 // Regular instance klass, fill in all local interfaces 1094 for (int index = 0; index < size; index++) { 1095 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1096 result->obj_at_put(index, k->java_mirror()); 1097 } 1098 } else { 1099 // All arrays implement java.lang.Cloneable and java.io.Serializable 1100 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1101 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1102 } 1103 return (jobjectArray) JNIHandles::make_local(env, result()); 1104 JVM_END 1105 1106 1107 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1108 JVMWrapper("JVM_IsInterface"); 1109 oop mirror = JNIHandles::resolve_non_null(cls); 1110 if (java_lang_Class::is_primitive(mirror)) { 1111 return JNI_FALSE; 1112 } 1113 Klass* k = java_lang_Class::as_Klass(mirror); 1114 jboolean result = k->is_interface(); 1115 assert(!result || k->is_instance_klass(), 1116 "all interfaces are instance types"); 1117 // The compiler intrinsic for isInterface tests the 1118 // Klass::_access_flags bits in the same way. 1119 return result; 1120 JVM_END 1121 1122 1123 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1124 JVMWrapper("JVM_GetClassSigners"); 1125 JvmtiVMObjectAllocEventCollector oam; 1126 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1127 // There are no signers for primitive types 1128 return NULL; 1129 } 1130 1131 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1132 1133 // If there are no signers set in the class, or if the class 1134 // is an array, return NULL. 1135 if (signers == NULL) return NULL; 1136 1137 // copy of the signers array 1138 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1139 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1140 for (int index = 0; index < signers->length(); index++) { 1141 signers_copy->obj_at_put(index, signers->obj_at(index)); 1142 } 1143 1144 // return the copy 1145 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1146 JVM_END 1147 1148 1149 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1150 JVMWrapper("JVM_SetClassSigners"); 1151 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1152 // This call is ignored for primitive types and arrays. 1153 // Signers are only set once, ClassLoader.java, and thus shouldn't 1154 // be called with an array. Only the bootstrap loader creates arrays. 1155 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1156 if (k->is_instance_klass()) { 1157 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1158 } 1159 } 1160 JVM_END 1161 1162 1163 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1164 JVMWrapper("JVM_GetProtectionDomain"); 1165 if (JNIHandles::resolve(cls) == NULL) { 1166 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1167 } 1168 1169 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1170 // Primitive types does not have a protection domain. 1171 return NULL; 1172 } 1173 1174 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1175 return (jobject) JNIHandles::make_local(env, pd); 1176 JVM_END 1177 1178 1179 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) { 1180 // If there is a security manager and protection domain, check the access 1181 // in the protection domain, otherwise it is authorized. 1182 if (java_lang_System::has_security_manager()) { 1183 1184 // For bootstrapping, if pd implies method isn't in the JDK, allow 1185 // this context to revert to older behavior. 1186 // In this case the isAuthorized field in AccessControlContext is also not 1187 // present. 1188 if (Universe::protection_domain_implies_method() == NULL) { 1189 return true; 1190 } 1191 1192 // Whitelist certain access control contexts 1193 if (java_security_AccessControlContext::is_authorized(context)) { 1194 return true; 1195 } 1196 1197 oop prot = klass->protection_domain(); 1198 if (prot != NULL) { 1199 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1200 // in the new wrapper. 1201 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1202 Handle h_prot(THREAD, prot); 1203 JavaValue result(T_BOOLEAN); 1204 JavaCallArguments args(h_prot); 1205 JavaCalls::call(&result, m, &args, CHECK_false); 1206 return (result.get_jboolean() != 0); 1207 } 1208 } 1209 return true; 1210 } 1211 1212 // Create an AccessControlContext with a protection domain with null codesource 1213 // and null permissions - which gives no permissions. 1214 oop create_dummy_access_control_context(TRAPS) { 1215 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1216 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1217 // Call constructor ProtectionDomain(null, null); 1218 JavaValue result(T_VOID); 1219 JavaCalls::call_special(&result, obj, pd_klass, 1220 vmSymbols::object_initializer_name(), 1221 vmSymbols::codesource_permissioncollection_signature(), 1222 Handle(), Handle(), CHECK_NULL); 1223 1224 // new ProtectionDomain[] {pd}; 1225 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1226 context->obj_at_put(0, obj()); 1227 1228 // new AccessControlContext(new ProtectionDomain[] {pd}) 1229 objArrayHandle h_context(THREAD, context); 1230 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1231 return acc; 1232 } 1233 1234 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1235 JVMWrapper("JVM_DoPrivileged"); 1236 1237 if (action == NULL) { 1238 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1239 } 1240 1241 // Compute the frame initiating the do privileged operation and setup the privileged stack 1242 vframeStream vfst(thread); 1243 vfst.security_get_caller_frame(1); 1244 1245 if (vfst.at_end()) { 1246 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1247 } 1248 1249 Method* method = vfst.method(); 1250 InstanceKlass* klass = method->method_holder(); 1251 1252 // Check that action object understands "Object run()" 1253 Handle h_context; 1254 if (context != NULL) { 1255 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1256 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1257 if (!authorized) { 1258 // Create an unprivileged access control object and call it's run function 1259 // instead. 1260 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1261 h_context = Handle(THREAD, noprivs); 1262 } 1263 } 1264 1265 // Check that action object understands "Object run()" 1266 Handle object (THREAD, JNIHandles::resolve(action)); 1267 1268 // get run() method 1269 Method* m_oop = object->klass()->uncached_lookup_method( 1270 vmSymbols::run_method_name(), 1271 vmSymbols::void_object_signature(), 1272 Klass::find_overpass); 1273 methodHandle m (THREAD, m_oop); 1274 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { 1275 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1276 } 1277 1278 // Stack allocated list of privileged stack elements 1279 PrivilegedElement pi; 1280 if (!vfst.at_end()) { 1281 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1282 thread->set_privileged_stack_top(&pi); 1283 } 1284 1285 1286 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1287 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1288 Handle pending_exception; 1289 JavaValue result(T_OBJECT); 1290 JavaCallArguments args(object); 1291 JavaCalls::call(&result, m, &args, THREAD); 1292 1293 // done with action, remove ourselves from the list 1294 if (!vfst.at_end()) { 1295 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1296 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1297 } 1298 1299 if (HAS_PENDING_EXCEPTION) { 1300 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1301 CLEAR_PENDING_EXCEPTION; 1302 // JVMTI has already reported the pending exception 1303 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1304 if (THREAD->is_Java_thread()) { 1305 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1306 } 1307 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1308 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1309 // Throw a java.security.PrivilegedActionException(Exception e) exception 1310 JavaCallArguments args(pending_exception); 1311 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1312 vmSymbols::exception_void_signature(), 1313 &args); 1314 } 1315 } 1316 1317 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1318 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1319 JVM_END 1320 1321 1322 // Returns the inherited_access_control_context field of the running thread. 1323 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1324 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1325 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1326 return JNIHandles::make_local(env, result); 1327 JVM_END 1328 1329 class RegisterArrayForGC { 1330 private: 1331 JavaThread *_thread; 1332 public: 1333 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1334 _thread = thread; 1335 _thread->register_array_for_gc(array); 1336 } 1337 1338 ~RegisterArrayForGC() { 1339 _thread->register_array_for_gc(NULL); 1340 } 1341 }; 1342 1343 1344 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1345 JVMWrapper("JVM_GetStackAccessControlContext"); 1346 if (!UsePrivilegedStack) return NULL; 1347 1348 ResourceMark rm(THREAD); 1349 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1350 JvmtiVMObjectAllocEventCollector oam; 1351 1352 // count the protection domains on the execution stack. We collapse 1353 // duplicate consecutive protection domains into a single one, as 1354 // well as stopping when we hit a privileged frame. 1355 1356 // Use vframeStream to iterate through Java frames 1357 vframeStream vfst(thread); 1358 1359 oop previous_protection_domain = NULL; 1360 Handle privileged_context(thread, NULL); 1361 bool is_privileged = false; 1362 oop protection_domain = NULL; 1363 1364 for(; !vfst.at_end(); vfst.next()) { 1365 // get method of frame 1366 Method* method = vfst.method(); 1367 intptr_t* frame_id = vfst.frame_id(); 1368 1369 // check the privileged frames to see if we have a match 1370 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1371 // this frame is privileged 1372 is_privileged = true; 1373 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1374 protection_domain = thread->privileged_stack_top()->protection_domain(); 1375 } else { 1376 protection_domain = method->method_holder()->protection_domain(); 1377 } 1378 1379 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1380 local_array->push(protection_domain); 1381 previous_protection_domain = protection_domain; 1382 } 1383 1384 if (is_privileged) break; 1385 } 1386 1387 1388 // either all the domains on the stack were system domains, or 1389 // we had a privileged system domain 1390 if (local_array->is_empty()) { 1391 if (is_privileged && privileged_context.is_null()) return NULL; 1392 1393 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1394 return JNIHandles::make_local(env, result); 1395 } 1396 1397 // the resource area must be registered in case of a gc 1398 RegisterArrayForGC ragc(thread, local_array); 1399 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1400 local_array->length(), CHECK_NULL); 1401 objArrayHandle h_context(thread, context); 1402 for (int index = 0; index < local_array->length(); index++) { 1403 h_context->obj_at_put(index, local_array->at(index)); 1404 } 1405 1406 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1407 1408 return JNIHandles::make_local(env, result); 1409 JVM_END 1410 1411 1412 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1413 JVMWrapper("JVM_IsArrayClass"); 1414 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1415 return (k != NULL) && k->is_array_klass() ? true : false; 1416 JVM_END 1417 1418 1419 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1420 JVMWrapper("JVM_IsPrimitiveClass"); 1421 oop mirror = JNIHandles::resolve_non_null(cls); 1422 return (jboolean) java_lang_Class::is_primitive(mirror); 1423 JVM_END 1424 1425 1426 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1427 JVMWrapper("JVM_GetClassModifiers"); 1428 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1429 // Primitive type 1430 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1431 } 1432 1433 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1434 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1435 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1436 return k->modifier_flags(); 1437 JVM_END 1438 1439 1440 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1441 1442 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1443 JvmtiVMObjectAllocEventCollector oam; 1444 // ofClass is a reference to a java_lang_Class object. The mirror object 1445 // of an InstanceKlass 1446 1447 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1448 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1449 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1450 return (jobjectArray)JNIHandles::make_local(env, result); 1451 } 1452 1453 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1454 InnerClassesIterator iter(k); 1455 1456 if (iter.length() == 0) { 1457 // Neither an inner nor outer class 1458 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1459 return (jobjectArray)JNIHandles::make_local(env, result); 1460 } 1461 1462 // find inner class info 1463 constantPoolHandle cp(thread, k->constants()); 1464 int length = iter.length(); 1465 1466 // Allocate temp. result array 1467 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1468 objArrayHandle result (THREAD, r); 1469 int members = 0; 1470 1471 for (; !iter.done(); iter.next()) { 1472 int ioff = iter.inner_class_info_index(); 1473 int ooff = iter.outer_class_info_index(); 1474 1475 if (ioff != 0 && ooff != 0) { 1476 // Check to see if the name matches the class we're looking for 1477 // before attempting to find the class. 1478 if (cp->klass_name_at_matches(k, ooff)) { 1479 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1480 if (outer_klass == k) { 1481 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1482 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1483 1484 // Throws an exception if outer klass has not declared k as 1485 // an inner klass 1486 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1487 1488 result->obj_at_put(members, inner_klass->java_mirror()); 1489 members++; 1490 } 1491 } 1492 } 1493 } 1494 1495 if (members != length) { 1496 // Return array of right length 1497 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1498 for(int i = 0; i < members; i++) { 1499 res->obj_at_put(i, result->obj_at(i)); 1500 } 1501 return (jobjectArray)JNIHandles::make_local(env, res); 1502 } 1503 1504 return (jobjectArray)JNIHandles::make_local(env, result()); 1505 JVM_END 1506 1507 1508 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1509 { 1510 // ofClass is a reference to a java_lang_Class object. 1511 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1512 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1513 return NULL; 1514 } 1515 1516 bool inner_is_member = false; 1517 Klass* outer_klass 1518 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1519 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1520 if (outer_klass == NULL) return NULL; // already a top-level class 1521 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1522 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1523 } 1524 JVM_END 1525 1526 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1527 { 1528 oop mirror = JNIHandles::resolve_non_null(cls); 1529 if (java_lang_Class::is_primitive(mirror) || 1530 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1531 return NULL; 1532 } 1533 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1534 int ooff = 0, noff = 0; 1535 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1536 if (noff != 0) { 1537 constantPoolHandle i_cp(thread, k->constants()); 1538 Symbol* name = i_cp->symbol_at(noff); 1539 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1540 return (jstring) JNIHandles::make_local(env, str()); 1541 } 1542 } 1543 return NULL; 1544 } 1545 JVM_END 1546 1547 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1548 assert (cls != NULL, "illegal class"); 1549 JVMWrapper("JVM_GetClassSignature"); 1550 JvmtiVMObjectAllocEventCollector oam; 1551 ResourceMark rm(THREAD); 1552 // Return null for arrays and primatives 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 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1557 if (sym == NULL) return NULL; 1558 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1559 return (jstring) JNIHandles::make_local(env, str()); 1560 } 1561 } 1562 return NULL; 1563 JVM_END 1564 1565 1566 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1567 assert (cls != NULL, "illegal class"); 1568 JVMWrapper("JVM_GetClassAnnotations"); 1569 1570 // Return null for arrays and primitives 1571 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1572 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1573 if (k->is_instance_klass()) { 1574 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1575 return (jbyteArray) JNIHandles::make_local(env, a); 1576 } 1577 } 1578 return NULL; 1579 JVM_END 1580 1581 1582 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1583 // some of this code was adapted from from jni_FromReflectedField 1584 1585 oop reflected = JNIHandles::resolve_non_null(field); 1586 oop mirror = java_lang_reflect_Field::clazz(reflected); 1587 Klass* k = java_lang_Class::as_Klass(mirror); 1588 int slot = java_lang_reflect_Field::slot(reflected); 1589 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1590 1591 InstanceKlass* ik = InstanceKlass::cast(k); 1592 intptr_t offset = ik->field_offset(slot); 1593 1594 if (modifiers & JVM_ACC_STATIC) { 1595 // for static fields we only look in the current class 1596 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1597 assert(false, "cannot find static field"); 1598 return false; 1599 } 1600 } else { 1601 // for instance fields we start with the current class and work 1602 // our way up through the superclass chain 1603 if (!ik->find_field_from_offset(offset, false, &fd)) { 1604 assert(false, "cannot find instance field"); 1605 return false; 1606 } 1607 } 1608 return true; 1609 } 1610 1611 static Method* jvm_get_method_common(jobject method) { 1612 // some of this code was adapted from from jni_FromReflectedMethod 1613 1614 oop reflected = JNIHandles::resolve_non_null(method); 1615 oop mirror = NULL; 1616 int slot = 0; 1617 1618 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1619 mirror = java_lang_reflect_Constructor::clazz(reflected); 1620 slot = java_lang_reflect_Constructor::slot(reflected); 1621 } else { 1622 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1623 "wrong type"); 1624 mirror = java_lang_reflect_Method::clazz(reflected); 1625 slot = java_lang_reflect_Method::slot(reflected); 1626 } 1627 Klass* k = java_lang_Class::as_Klass(mirror); 1628 1629 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1630 assert(m != NULL, "cannot find method"); 1631 return m; // caller has to deal with NULL in product mode 1632 } 1633 1634 /* Type use annotations support (JDK 1.8) */ 1635 1636 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1637 assert (cls != NULL, "illegal class"); 1638 JVMWrapper("JVM_GetClassTypeAnnotations"); 1639 ResourceMark rm(THREAD); 1640 // Return null for arrays and primitives 1641 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1642 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1643 if (k->is_instance_klass()) { 1644 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1645 if (type_annotations != NULL) { 1646 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1647 return (jbyteArray) JNIHandles::make_local(env, a); 1648 } 1649 } 1650 } 1651 return NULL; 1652 JVM_END 1653 1654 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1655 assert (method != NULL, "illegal method"); 1656 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1657 1658 // method is a handle to a java.lang.reflect.Method object 1659 Method* m = jvm_get_method_common(method); 1660 if (m == NULL) { 1661 return NULL; 1662 } 1663 1664 AnnotationArray* type_annotations = m->type_annotations(); 1665 if (type_annotations != NULL) { 1666 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1667 return (jbyteArray) JNIHandles::make_local(env, a); 1668 } 1669 1670 return NULL; 1671 JVM_END 1672 1673 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1674 assert (field != NULL, "illegal field"); 1675 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1676 1677 fieldDescriptor fd; 1678 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1679 if (!gotFd) { 1680 return NULL; 1681 } 1682 1683 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1684 JVM_END 1685 1686 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { 1687 if (!cp->is_within_bounds(index)) { 1688 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1689 } 1690 } 1691 1692 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1693 { 1694 JVMWrapper("JVM_GetMethodParameters"); 1695 // method is a handle to a java.lang.reflect.Method object 1696 Method* method_ptr = jvm_get_method_common(method); 1697 methodHandle mh (THREAD, method_ptr); 1698 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1699 const int num_params = mh->method_parameters_length(); 1700 1701 if (num_params < 0) { 1702 // A -1 return value from method_parameters_length means there is no 1703 // parameter data. Return null to indicate this to the reflection 1704 // API. 1705 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1706 return (jobjectArray)NULL; 1707 } else { 1708 // Otherwise, we return something up to reflection, even if it is 1709 // a zero-length array. Why? Because in some cases this can 1710 // trigger a MalformedParametersException. 1711 1712 // make sure all the symbols are properly formatted 1713 for (int i = 0; i < num_params; i++) { 1714 MethodParametersElement* params = mh->method_parameters_start(); 1715 int index = params[i].name_cp_index; 1716 bounds_check(mh->constants(), index, CHECK_NULL); 1717 1718 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1719 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1720 "Wrong type at constant pool index"); 1721 } 1722 1723 } 1724 1725 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1726 objArrayHandle result (THREAD, result_oop); 1727 1728 for (int i = 0; i < num_params; i++) { 1729 MethodParametersElement* params = mh->method_parameters_start(); 1730 // For a 0 index, give a NULL symbol 1731 Symbol* sym = 0 != params[i].name_cp_index ? 1732 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1733 int flags = params[i].flags; 1734 oop param = Reflection::new_parameter(reflected_method, i, sym, 1735 flags, CHECK_NULL); 1736 result->obj_at_put(i, param); 1737 } 1738 return (jobjectArray)JNIHandles::make_local(env, result()); 1739 } 1740 } 1741 JVM_END 1742 1743 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1744 1745 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1746 { 1747 JVMWrapper("JVM_GetClassDeclaredFields"); 1748 JvmtiVMObjectAllocEventCollector oam; 1749 1750 // Exclude primitive types and array types 1751 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1752 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1753 // Return empty array 1754 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1755 return (jobjectArray) JNIHandles::make_local(env, res); 1756 } 1757 1758 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1759 constantPoolHandle cp(THREAD, k->constants()); 1760 1761 // Ensure class is linked 1762 k->link_class(CHECK_NULL); 1763 1764 // Allocate result 1765 int num_fields; 1766 1767 if (publicOnly) { 1768 num_fields = 0; 1769 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1770 if (fs.access_flags().is_public()) ++num_fields; 1771 } 1772 } else { 1773 num_fields = k->java_fields_count(); 1774 } 1775 1776 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1777 objArrayHandle result (THREAD, r); 1778 1779 int out_idx = 0; 1780 fieldDescriptor fd; 1781 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1782 if (!publicOnly || fs.access_flags().is_public()) { 1783 fd.reinitialize(k, fs.index()); 1784 oop field = Reflection::new_field(&fd, CHECK_NULL); 1785 result->obj_at_put(out_idx, field); 1786 ++out_idx; 1787 } 1788 } 1789 assert(out_idx == num_fields, "just checking"); 1790 return (jobjectArray) JNIHandles::make_local(env, result()); 1791 } 1792 JVM_END 1793 1794 static bool select_method(methodHandle method, bool want_constructor) { 1795 if (want_constructor) { 1796 return (method->is_initializer() && !method->is_static()); 1797 } else { 1798 return (!method->is_initializer() && !method->is_overpass()); 1799 } 1800 } 1801 1802 static jobjectArray get_class_declared_methods_helper( 1803 JNIEnv *env, 1804 jclass ofClass, jboolean publicOnly, 1805 bool want_constructor, 1806 Klass* klass, TRAPS) { 1807 1808 JvmtiVMObjectAllocEventCollector oam; 1809 1810 // Exclude primitive types and array types 1811 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1812 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1813 // Return empty array 1814 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1815 return (jobjectArray) JNIHandles::make_local(env, res); 1816 } 1817 1818 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1819 1820 // Ensure class is linked 1821 k->link_class(CHECK_NULL); 1822 1823 Array<Method*>* methods = k->methods(); 1824 int methods_length = methods->length(); 1825 1826 // Save original method_idnum in case of redefinition, which can change 1827 // the idnum of obsolete methods. The new method will have the same idnum 1828 // but if we refresh the methods array, the counts will be wrong. 1829 ResourceMark rm(THREAD); 1830 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1831 int num_methods = 0; 1832 1833 for (int i = 0; i < methods_length; i++) { 1834 methodHandle method(THREAD, methods->at(i)); 1835 if (select_method(method, want_constructor)) { 1836 if (!publicOnly || method->is_public()) { 1837 idnums->push(method->method_idnum()); 1838 ++num_methods; 1839 } 1840 } 1841 } 1842 1843 // Allocate result 1844 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1845 objArrayHandle result (THREAD, r); 1846 1847 // Now just put the methods that we selected above, but go by their idnum 1848 // in case of redefinition. The methods can be redefined at any safepoint, 1849 // so above when allocating the oop array and below when creating reflect 1850 // objects. 1851 for (int i = 0; i < num_methods; i++) { 1852 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1853 if (method.is_null()) { 1854 // Method may have been deleted and seems this API can handle null 1855 // Otherwise should probably put a method that throws NSME 1856 result->obj_at_put(i, NULL); 1857 } else { 1858 oop m; 1859 if (want_constructor) { 1860 m = Reflection::new_constructor(method, CHECK_NULL); 1861 } else { 1862 m = Reflection::new_method(method, false, CHECK_NULL); 1863 } 1864 result->obj_at_put(i, m); 1865 } 1866 } 1867 1868 return (jobjectArray) JNIHandles::make_local(env, result()); 1869 } 1870 1871 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1872 { 1873 JVMWrapper("JVM_GetClassDeclaredMethods"); 1874 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1875 /*want_constructor*/ false, 1876 SystemDictionary::reflect_Method_klass(), THREAD); 1877 } 1878 JVM_END 1879 1880 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1881 { 1882 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1883 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1884 /*want_constructor*/ true, 1885 SystemDictionary::reflect_Constructor_klass(), THREAD); 1886 } 1887 JVM_END 1888 1889 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1890 { 1891 JVMWrapper("JVM_GetClassAccessFlags"); 1892 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1893 // Primitive type 1894 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1895 } 1896 1897 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1898 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1899 } 1900 JVM_END 1901 1902 1903 // Constant pool access ////////////////////////////////////////////////////////// 1904 1905 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1906 { 1907 JVMWrapper("JVM_GetClassConstantPool"); 1908 JvmtiVMObjectAllocEventCollector oam; 1909 1910 // Return null for primitives and arrays 1911 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1912 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1913 if (k->is_instance_klass()) { 1914 InstanceKlass* k_h = InstanceKlass::cast(k); 1915 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1916 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1917 return JNIHandles::make_local(jcp()); 1918 } 1919 } 1920 return NULL; 1921 } 1922 JVM_END 1923 1924 1925 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1926 { 1927 JVMWrapper("JVM_ConstantPoolGetSize"); 1928 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1929 return cp->length(); 1930 } 1931 JVM_END 1932 1933 1934 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1935 { 1936 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1937 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1938 bounds_check(cp, index, CHECK_NULL); 1939 constantTag tag = cp->tag_at(index); 1940 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1941 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1942 } 1943 Klass* k = cp->klass_at(index, CHECK_NULL); 1944 return (jclass) JNIHandles::make_local(k->java_mirror()); 1945 } 1946 JVM_END 1947 1948 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1949 { 1950 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1951 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1952 bounds_check(cp, index, CHECK_NULL); 1953 constantTag tag = cp->tag_at(index); 1954 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1955 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1956 } 1957 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1958 if (k == NULL) return NULL; 1959 return (jclass) JNIHandles::make_local(k->java_mirror()); 1960 } 1961 JVM_END 1962 1963 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1964 constantTag tag = cp->tag_at(index); 1965 if (!tag.is_method() && !tag.is_interface_method()) { 1966 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1967 } 1968 int klass_ref = cp->uncached_klass_ref_index_at(index); 1969 Klass* k_o; 1970 if (force_resolution) { 1971 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1972 } else { 1973 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1974 if (k_o == NULL) return NULL; 1975 } 1976 InstanceKlass* k = InstanceKlass::cast(k_o); 1977 Symbol* name = cp->uncached_name_ref_at(index); 1978 Symbol* sig = cp->uncached_signature_ref_at(index); 1979 methodHandle m (THREAD, k->find_method(name, sig)); 1980 if (m.is_null()) { 1981 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1982 } 1983 oop method; 1984 if (!m->is_initializer() || m->is_static()) { 1985 method = Reflection::new_method(m, true, CHECK_NULL); 1986 } else { 1987 method = Reflection::new_constructor(m, CHECK_NULL); 1988 } 1989 return JNIHandles::make_local(method); 1990 } 1991 1992 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1993 { 1994 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1995 JvmtiVMObjectAllocEventCollector oam; 1996 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1997 bounds_check(cp, index, CHECK_NULL); 1998 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1999 return res; 2000 } 2001 JVM_END 2002 2003 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2004 { 2005 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2006 JvmtiVMObjectAllocEventCollector oam; 2007 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2008 bounds_check(cp, index, CHECK_NULL); 2009 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2010 return res; 2011 } 2012 JVM_END 2013 2014 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2015 constantTag tag = cp->tag_at(index); 2016 if (!tag.is_field()) { 2017 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2018 } 2019 int klass_ref = cp->uncached_klass_ref_index_at(index); 2020 Klass* k_o; 2021 if (force_resolution) { 2022 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2023 } else { 2024 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2025 if (k_o == NULL) return NULL; 2026 } 2027 InstanceKlass* k = InstanceKlass::cast(k_o); 2028 Symbol* name = cp->uncached_name_ref_at(index); 2029 Symbol* sig = cp->uncached_signature_ref_at(index); 2030 fieldDescriptor fd; 2031 Klass* target_klass = k->find_field(name, sig, &fd); 2032 if (target_klass == NULL) { 2033 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2034 } 2035 oop field = Reflection::new_field(&fd, CHECK_NULL); 2036 return JNIHandles::make_local(field); 2037 } 2038 2039 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2040 { 2041 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2042 JvmtiVMObjectAllocEventCollector oam; 2043 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2044 bounds_check(cp, index, CHECK_NULL); 2045 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2046 return res; 2047 } 2048 JVM_END 2049 2050 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2051 { 2052 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2053 JvmtiVMObjectAllocEventCollector oam; 2054 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2055 bounds_check(cp, index, CHECK_NULL); 2056 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2057 return res; 2058 } 2059 JVM_END 2060 2061 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2062 { 2063 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2064 JvmtiVMObjectAllocEventCollector oam; 2065 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2066 bounds_check(cp, index, CHECK_NULL); 2067 constantTag tag = cp->tag_at(index); 2068 if (!tag.is_field_or_method()) { 2069 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2070 } 2071 int klass_ref = cp->uncached_klass_ref_index_at(index); 2072 Symbol* klass_name = cp->klass_name_at(klass_ref); 2073 Symbol* member_name = cp->uncached_name_ref_at(index); 2074 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2075 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2076 objArrayHandle dest(THREAD, dest_o); 2077 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2078 dest->obj_at_put(0, str()); 2079 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2080 dest->obj_at_put(1, str()); 2081 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2082 dest->obj_at_put(2, str()); 2083 return (jobjectArray) JNIHandles::make_local(dest()); 2084 } 2085 JVM_END 2086 2087 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2088 { 2089 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2090 JvmtiVMObjectAllocEventCollector oam; 2091 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2092 bounds_check(cp, index, CHECK_0); 2093 constantTag tag = cp->tag_at(index); 2094 if (!tag.is_field_or_method()) { 2095 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2096 } 2097 return (jint) cp->uncached_klass_ref_index_at(index); 2098 } 2099 JVM_END 2100 2101 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2102 { 2103 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2104 JvmtiVMObjectAllocEventCollector oam; 2105 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2106 bounds_check(cp, index, CHECK_0); 2107 constantTag tag = cp->tag_at(index); 2108 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2109 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2110 } 2111 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2112 } 2113 JVM_END 2114 2115 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2116 { 2117 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2118 JvmtiVMObjectAllocEventCollector oam; 2119 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2120 bounds_check(cp, index, CHECK_NULL); 2121 constantTag tag = cp->tag_at(index); 2122 if (!tag.is_name_and_type()) { 2123 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2124 } 2125 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2126 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2127 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2128 objArrayHandle dest(THREAD, dest_o); 2129 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2130 dest->obj_at_put(0, str()); 2131 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2132 dest->obj_at_put(1, str()); 2133 return (jobjectArray) JNIHandles::make_local(dest()); 2134 } 2135 JVM_END 2136 2137 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2138 { 2139 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2140 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2141 bounds_check(cp, index, CHECK_0); 2142 constantTag tag = cp->tag_at(index); 2143 if (!tag.is_int()) { 2144 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2145 } 2146 return cp->int_at(index); 2147 } 2148 JVM_END 2149 2150 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2151 { 2152 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2154 bounds_check(cp, index, CHECK_(0L)); 2155 constantTag tag = cp->tag_at(index); 2156 if (!tag.is_long()) { 2157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2158 } 2159 return cp->long_at(index); 2160 } 2161 JVM_END 2162 2163 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2164 { 2165 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2166 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2167 bounds_check(cp, index, CHECK_(0.0f)); 2168 constantTag tag = cp->tag_at(index); 2169 if (!tag.is_float()) { 2170 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2171 } 2172 return cp->float_at(index); 2173 } 2174 JVM_END 2175 2176 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2177 { 2178 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2179 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2180 bounds_check(cp, index, CHECK_(0.0)); 2181 constantTag tag = cp->tag_at(index); 2182 if (!tag.is_double()) { 2183 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2184 } 2185 return cp->double_at(index); 2186 } 2187 JVM_END 2188 2189 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2190 { 2191 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2192 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2193 bounds_check(cp, index, CHECK_NULL); 2194 constantTag tag = cp->tag_at(index); 2195 if (!tag.is_string()) { 2196 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2197 } 2198 oop str = cp->string_at(index, CHECK_NULL); 2199 return (jstring) JNIHandles::make_local(str); 2200 } 2201 JVM_END 2202 2203 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2204 { 2205 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2206 JvmtiVMObjectAllocEventCollector oam; 2207 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2208 bounds_check(cp, index, CHECK_NULL); 2209 constantTag tag = cp->tag_at(index); 2210 if (!tag.is_symbol()) { 2211 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2212 } 2213 Symbol* sym = cp->symbol_at(index); 2214 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2215 return (jstring) JNIHandles::make_local(str()); 2216 } 2217 JVM_END 2218 2219 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2220 { 2221 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2222 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2223 bounds_check(cp, index, CHECK_0); 2224 constantTag tag = cp->tag_at(index); 2225 jbyte result = tag.value(); 2226 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2227 // they are changed to the corresponding tags from the JVM spec, so that java code in 2228 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2229 if (tag.is_klass_or_reference()) { 2230 result = JVM_CONSTANT_Class; 2231 } else if (tag.is_string_index()) { 2232 result = JVM_CONSTANT_String; 2233 } else if (tag.is_method_type_in_error()) { 2234 result = JVM_CONSTANT_MethodType; 2235 } else if (tag.is_method_handle_in_error()) { 2236 result = JVM_CONSTANT_MethodHandle; 2237 } 2238 return result; 2239 } 2240 JVM_END 2241 2242 // Assertion support. ////////////////////////////////////////////////////////// 2243 2244 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2245 JVMWrapper("JVM_DesiredAssertionStatus"); 2246 assert(cls != NULL, "bad class"); 2247 2248 oop r = JNIHandles::resolve(cls); 2249 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2250 if (java_lang_Class::is_primitive(r)) return false; 2251 2252 Klass* k = java_lang_Class::as_Klass(r); 2253 assert(k->is_instance_klass(), "must be an instance klass"); 2254 if (!k->is_instance_klass()) return false; 2255 2256 ResourceMark rm(THREAD); 2257 const char* name = k->name()->as_C_string(); 2258 bool system_class = k->class_loader() == NULL; 2259 return JavaAssertions::enabled(name, system_class); 2260 2261 JVM_END 2262 2263 2264 // Return a new AssertionStatusDirectives object with the fields filled in with 2265 // command-line assertion arguments (i.e., -ea, -da). 2266 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2267 JVMWrapper("JVM_AssertionStatusDirectives"); 2268 JvmtiVMObjectAllocEventCollector oam; 2269 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2270 return JNIHandles::make_local(env, asd); 2271 JVM_END 2272 2273 // Verification //////////////////////////////////////////////////////////////////////////////// 2274 2275 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2276 2277 // RedefineClasses support: bug 6214132 caused verification to fail. 2278 // All functions from this section should call the jvmtiThreadSate function: 2279 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2280 // The function returns a Klass* of the _scratch_class if the verifier 2281 // was invoked in the middle of the class redefinition. 2282 // Otherwise it returns its argument value which is the _the_class Klass*. 2283 // Please, refer to the description in the jvmtiThreadSate.hpp. 2284 2285 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2286 JVMWrapper("JVM_GetClassNameUTF"); 2287 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2288 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2289 return k->name()->as_utf8(); 2290 JVM_END 2291 2292 2293 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2294 JVMWrapper("JVM_GetClassCPTypes"); 2295 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2296 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2297 // types will have length zero if this is not an InstanceKlass 2298 // (length is determined by call to JVM_GetClassCPEntriesCount) 2299 if (k->is_instance_klass()) { 2300 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2301 for (int index = cp->length() - 1; index >= 0; index--) { 2302 constantTag tag = cp->tag_at(index); 2303 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2304 } 2305 } 2306 JVM_END 2307 2308 2309 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2310 JVMWrapper("JVM_GetClassCPEntriesCount"); 2311 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2312 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2313 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2314 JVM_END 2315 2316 2317 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2318 JVMWrapper("JVM_GetClassFieldsCount"); 2319 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2320 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2321 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2322 JVM_END 2323 2324 2325 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2326 JVMWrapper("JVM_GetClassMethodsCount"); 2327 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2328 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2329 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2330 JVM_END 2331 2332 2333 // The following methods, used for the verifier, are never called with 2334 // array klasses, so a direct cast to InstanceKlass is safe. 2335 // Typically, these methods are called in a loop with bounds determined 2336 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2337 // zero for arrays. 2338 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2339 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2340 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2341 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2342 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2343 int length = method->checked_exceptions_length(); 2344 if (length > 0) { 2345 CheckedExceptionElement* table= method->checked_exceptions_start(); 2346 for (int i = 0; i < length; i++) { 2347 exceptions[i] = table[i].class_cp_index; 2348 } 2349 } 2350 JVM_END 2351 2352 2353 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2354 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 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->checked_exceptions_length(); 2359 JVM_END 2360 2361 2362 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2363 JVMWrapper("JVM_GetMethodIxByteCode"); 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 memcpy(code, method->code_base(), method->code_size()); 2368 JVM_END 2369 2370 2371 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2372 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2373 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2374 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2375 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2376 return method->code_size(); 2377 JVM_END 2378 2379 2380 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2381 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2382 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2383 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2384 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2385 ExceptionTable extable(method); 2386 entry->start_pc = extable.start_pc(entry_index); 2387 entry->end_pc = extable.end_pc(entry_index); 2388 entry->handler_pc = extable.handler_pc(entry_index); 2389 entry->catchType = extable.catch_type_index(entry_index); 2390 JVM_END 2391 2392 2393 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2394 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2395 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2396 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2397 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2398 return method->exception_table_length(); 2399 JVM_END 2400 2401 2402 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2403 JVMWrapper("JVM_GetMethodIxModifiers"); 2404 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2405 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2406 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2407 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2408 JVM_END 2409 2410 2411 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2412 JVMWrapper("JVM_GetFieldIxModifiers"); 2413 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2414 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2415 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2416 JVM_END 2417 2418 2419 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2420 JVMWrapper("JVM_GetMethodIxLocalsCount"); 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->max_locals(); 2425 JVM_END 2426 2427 2428 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2429 JVMWrapper("JVM_GetMethodIxArgsSize"); 2430 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2431 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2432 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2433 return method->size_of_parameters(); 2434 JVM_END 2435 2436 2437 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2438 JVMWrapper("JVM_GetMethodIxMaxStack"); 2439 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2440 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2441 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2442 return method->verifier_max_stack(); 2443 JVM_END 2444 2445 2446 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2447 JVMWrapper("JVM_IsConstructorIx"); 2448 ResourceMark rm(THREAD); 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() == vmSymbols::object_initializer_name(); 2453 JVM_END 2454 2455 2456 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2457 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2458 ResourceMark rm(THREAD); 2459 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2460 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2461 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2462 return method->is_overpass(); 2463 JVM_END 2464 2465 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2466 JVMWrapper("JVM_GetMethodIxIxUTF"); 2467 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2468 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2469 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2470 return method->name()->as_utf8(); 2471 JVM_END 2472 2473 2474 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2475 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2476 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2477 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2478 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2479 return method->signature()->as_utf8(); 2480 JVM_END 2481 2482 /** 2483 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2484 * read entries in the constant pool. Since the old verifier always 2485 * works on a copy of the code, it will not see any rewriting that 2486 * may possibly occur in the middle of verification. So it is important 2487 * that nothing it calls tries to use the cpCache instead of the raw 2488 * constant pool, so we must use cp->uncached_x methods when appropriate. 2489 */ 2490 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2491 JVMWrapper("JVM_GetCPFieldNameUTF"); 2492 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2493 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2494 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2495 switch (cp->tag_at(cp_index).value()) { 2496 case JVM_CONSTANT_Fieldref: 2497 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2498 default: 2499 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2500 } 2501 ShouldNotReachHere(); 2502 return NULL; 2503 JVM_END 2504 2505 2506 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2507 JVMWrapper("JVM_GetCPMethodNameUTF"); 2508 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2509 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2510 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2511 switch (cp->tag_at(cp_index).value()) { 2512 case JVM_CONSTANT_InterfaceMethodref: 2513 case JVM_CONSTANT_Methodref: 2514 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2515 default: 2516 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2517 } 2518 ShouldNotReachHere(); 2519 return NULL; 2520 JVM_END 2521 2522 2523 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2524 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2525 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2526 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2527 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2528 switch (cp->tag_at(cp_index).value()) { 2529 case JVM_CONSTANT_InterfaceMethodref: 2530 case JVM_CONSTANT_Methodref: 2531 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2532 default: 2533 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2534 } 2535 ShouldNotReachHere(); 2536 return NULL; 2537 JVM_END 2538 2539 2540 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2541 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2542 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2543 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2544 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2545 switch (cp->tag_at(cp_index).value()) { 2546 case JVM_CONSTANT_Fieldref: 2547 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2548 default: 2549 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2550 } 2551 ShouldNotReachHere(); 2552 return NULL; 2553 JVM_END 2554 2555 2556 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2557 JVMWrapper("JVM_GetCPClassNameUTF"); 2558 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2559 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2560 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2561 Symbol* classname = cp->klass_name_at(cp_index); 2562 return classname->as_utf8(); 2563 JVM_END 2564 2565 2566 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2567 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2568 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2569 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2570 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2571 switch (cp->tag_at(cp_index).value()) { 2572 case JVM_CONSTANT_Fieldref: { 2573 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2574 Symbol* classname = cp->klass_name_at(class_index); 2575 return classname->as_utf8(); 2576 } 2577 default: 2578 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2579 } 2580 ShouldNotReachHere(); 2581 return NULL; 2582 JVM_END 2583 2584 2585 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2586 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2587 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2588 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2589 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2590 switch (cp->tag_at(cp_index).value()) { 2591 case JVM_CONSTANT_Methodref: 2592 case JVM_CONSTANT_InterfaceMethodref: { 2593 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2594 Symbol* classname = cp->klass_name_at(class_index); 2595 return classname->as_utf8(); 2596 } 2597 default: 2598 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2599 } 2600 ShouldNotReachHere(); 2601 return NULL; 2602 JVM_END 2603 2604 2605 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2606 JVMWrapper("JVM_GetCPFieldModifiers"); 2607 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2608 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2609 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2610 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2611 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2612 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2613 switch (cp->tag_at(cp_index).value()) { 2614 case JVM_CONSTANT_Fieldref: { 2615 Symbol* name = cp->uncached_name_ref_at(cp_index); 2616 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2617 InstanceKlass* ik = InstanceKlass::cast(k_called); 2618 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2619 if (fs.name() == name && fs.signature() == signature) { 2620 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2621 } 2622 } 2623 return -1; 2624 } 2625 default: 2626 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2627 } 2628 ShouldNotReachHere(); 2629 return 0; 2630 JVM_END 2631 2632 2633 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2634 JVMWrapper("JVM_GetCPMethodModifiers"); 2635 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2636 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2637 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2638 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2639 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2640 switch (cp->tag_at(cp_index).value()) { 2641 case JVM_CONSTANT_Methodref: 2642 case JVM_CONSTANT_InterfaceMethodref: { 2643 Symbol* name = cp->uncached_name_ref_at(cp_index); 2644 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2645 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2646 int methods_count = methods->length(); 2647 for (int i = 0; i < methods_count; i++) { 2648 Method* method = methods->at(i); 2649 if (method->name() == name && method->signature() == signature) { 2650 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2651 } 2652 } 2653 return -1; 2654 } 2655 default: 2656 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2657 } 2658 ShouldNotReachHere(); 2659 return 0; 2660 JVM_END 2661 2662 2663 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2664 2665 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2666 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2667 JVM_END 2668 2669 2670 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2671 JVMWrapper("JVM_IsSameClassPackage"); 2672 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2673 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2674 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2675 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2676 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2677 JVM_END 2678 2679 // Printing support ////////////////////////////////////////////////// 2680 extern "C" { 2681 2682 ATTRIBUTE_PRINTF(3, 0) 2683 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2684 // see bug 4399518, 4417214 2685 if ((intptr_t)count <= 0) return -1; 2686 2687 int result = vsnprintf(str, count, fmt, args); 2688 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2689 // characters which would have been written had the buffer been large 2690 // enough; on Windows, it returns -1. We handle both cases here and 2691 // always return -1, and perform null termination. 2692 if ((result > 0 && (size_t)result >= count) || result == -1) { 2693 str[count - 1] = '\0'; 2694 result = -1; 2695 } 2696 2697 return result; 2698 } 2699 2700 ATTRIBUTE_PRINTF(3, 0) 2701 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2702 va_list args; 2703 int len; 2704 va_start(args, fmt); 2705 len = jio_vsnprintf(str, count, fmt, args); 2706 va_end(args); 2707 return len; 2708 } 2709 2710 ATTRIBUTE_PRINTF(2,3) 2711 int jio_fprintf(FILE* f, const char *fmt, ...) { 2712 int len; 2713 va_list args; 2714 va_start(args, fmt); 2715 len = jio_vfprintf(f, fmt, args); 2716 va_end(args); 2717 return len; 2718 } 2719 2720 ATTRIBUTE_PRINTF(2, 0) 2721 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2722 if (Arguments::vfprintf_hook() != NULL) { 2723 return Arguments::vfprintf_hook()(f, fmt, args); 2724 } else { 2725 return vfprintf(f, fmt, args); 2726 } 2727 } 2728 2729 ATTRIBUTE_PRINTF(1, 2) 2730 JNIEXPORT int jio_printf(const char *fmt, ...) { 2731 int len; 2732 va_list args; 2733 va_start(args, fmt); 2734 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2735 va_end(args); 2736 return len; 2737 } 2738 2739 2740 // HotSpot specific jio method 2741 void jio_print(const char* s) { 2742 // Try to make this function as atomic as possible. 2743 if (Arguments::vfprintf_hook() != NULL) { 2744 jio_fprintf(defaultStream::output_stream(), "%s", s); 2745 } else { 2746 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2747 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2748 } 2749 } 2750 2751 } // Extern C 2752 2753 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2754 2755 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 2756 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or 2757 // OSThread objects. The exception to this rule is when the target object is the thread 2758 // doing the operation, in which case we know that the thread won't exit until the 2759 // operation is done (all exits being voluntary). There are a few cases where it is 2760 // rather silly to do operations on yourself, like resuming yourself or asking whether 2761 // you are alive. While these can still happen, they are not subject to deadlocks if 2762 // the lock is held while the operation occurs (this is not the case for suspend, for 2763 // instance), and are very unlikely. Because IsAlive needs to be fast and its 2764 // implementation is local to this file, we always lock Threads_lock for that one. 2765 2766 static void thread_entry(JavaThread* thread, TRAPS) { 2767 HandleMark hm(THREAD); 2768 Handle obj(THREAD, thread->threadObj()); 2769 JavaValue result(T_VOID); 2770 JavaCalls::call_virtual(&result, 2771 obj, 2772 SystemDictionary::Thread_klass(), 2773 vmSymbols::run_method_name(), 2774 vmSymbols::void_method_signature(), 2775 THREAD); 2776 } 2777 2778 2779 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2780 JVMWrapper("JVM_StartThread"); 2781 JavaThread *native_thread = NULL; 2782 2783 // We cannot hold the Threads_lock when we throw an exception, 2784 // due to rank ordering issues. Example: we might need to grab the 2785 // Heap_lock while we construct the exception. 2786 bool throw_illegal_thread_state = false; 2787 2788 // We must release the Threads_lock before we can post a jvmti event 2789 // in Thread::start. 2790 { 2791 // Ensure that the C++ Thread and OSThread structures aren't freed before 2792 // we operate. 2793 MutexLocker mu(Threads_lock); 2794 2795 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2796 // re-starting an already started thread, so we should usually find 2797 // that the JavaThread is null. However for a JNI attached thread 2798 // there is a small window between the Thread object being created 2799 // (with its JavaThread set) and the update to its threadStatus, so we 2800 // have to check for this 2801 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2802 throw_illegal_thread_state = true; 2803 } else { 2804 // We could also check the stillborn flag to see if this thread was already stopped, but 2805 // for historical reasons we let the thread detect that itself when it starts running 2806 2807 jlong size = 2808 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2809 // Allocate the C++ Thread structure and create the native thread. The 2810 // stack size retrieved from java is 64-bit signed, but the constructor takes 2811 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2812 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2813 // - Avoid passing negative values which would result in really large stacks. 2814 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2815 size_t sz = size > 0 ? (size_t) size : 0; 2816 native_thread = new JavaThread(&thread_entry, sz); 2817 2818 // At this point it may be possible that no osthread was created for the 2819 // JavaThread due to lack of memory. Check for this situation and throw 2820 // an exception if necessary. Eventually we may want to change this so 2821 // that we only grab the lock if the thread was created successfully - 2822 // then we can also do this check and throw the exception in the 2823 // JavaThread constructor. 2824 if (native_thread->osthread() != NULL) { 2825 // Note: the current thread is not being used within "prepare". 2826 native_thread->prepare(jthread); 2827 } 2828 } 2829 } 2830 2831 if (throw_illegal_thread_state) { 2832 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2833 } 2834 2835 assert(native_thread != NULL, "Starting null thread?"); 2836 2837 if (native_thread->osthread() == NULL) { 2838 // No one should hold a reference to the 'native_thread'. 2839 delete native_thread; 2840 if (JvmtiExport::should_post_resource_exhausted()) { 2841 JvmtiExport::post_resource_exhausted( 2842 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2843 os::native_thread_creation_failed_msg()); 2844 } 2845 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2846 os::native_thread_creation_failed_msg()); 2847 } 2848 2849 Thread::start(native_thread); 2850 2851 JVM_END 2852 2853 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2854 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2855 // but is thought to be reliable and simple. In the case, where the receiver is the 2856 // same thread as the sender, no safepoint is needed. 2857 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2858 JVMWrapper("JVM_StopThread"); 2859 2860 oop java_throwable = JNIHandles::resolve(throwable); 2861 if (java_throwable == NULL) { 2862 THROW(vmSymbols::java_lang_NullPointerException()); 2863 } 2864 oop java_thread = JNIHandles::resolve_non_null(jthread); 2865 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2866 Events::log_exception(JavaThread::current(), 2867 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2868 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2869 // First check if thread is alive 2870 if (receiver != NULL) { 2871 // Check if exception is getting thrown at self (use oop equality, since the 2872 // target object might exit) 2873 if (java_thread == thread->threadObj()) { 2874 THROW_OOP(java_throwable); 2875 } else { 2876 // Enques a VM_Operation to stop all threads and then deliver the exception... 2877 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 2878 } 2879 } 2880 else { 2881 // Either: 2882 // - target thread has not been started before being stopped, or 2883 // - target thread already terminated 2884 // We could read the threadStatus to determine which case it is 2885 // but that is overkill as it doesn't matter. We must set the 2886 // stillborn flag for the first case, and if the thread has already 2887 // exited setting this flag has no affect 2888 java_lang_Thread::set_stillborn(java_thread); 2889 } 2890 JVM_END 2891 2892 2893 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2894 JVMWrapper("JVM_IsThreadAlive"); 2895 2896 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2897 return java_lang_Thread::is_alive(thread_oop); 2898 JVM_END 2899 2900 2901 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2902 JVMWrapper("JVM_SuspendThread"); 2903 oop java_thread = JNIHandles::resolve_non_null(jthread); 2904 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2905 2906 if (receiver != NULL) { 2907 // thread has run and has not exited (still on threads list) 2908 2909 { 2910 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2911 if (receiver->is_external_suspend()) { 2912 // Don't allow nested external suspend requests. We can't return 2913 // an error from this interface so just ignore the problem. 2914 return; 2915 } 2916 if (receiver->is_exiting()) { // thread is in the process of exiting 2917 return; 2918 } 2919 receiver->set_external_suspend(); 2920 } 2921 2922 // java_suspend() will catch threads in the process of exiting 2923 // and will ignore them. 2924 receiver->java_suspend(); 2925 2926 // It would be nice to have the following assertion in all the 2927 // time, but it is possible for a racing resume request to have 2928 // resumed this thread right after we suspended it. Temporarily 2929 // enable this assertion if you are chasing a different kind of 2930 // bug. 2931 // 2932 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2933 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2934 } 2935 JVM_END 2936 2937 2938 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2939 JVMWrapper("JVM_ResumeThread"); 2940 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 2941 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2942 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2943 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2944 // looks at it. 2945 MutexLocker ml(Threads_lock); 2946 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2947 if (thr != NULL) { 2948 // the thread has run and is not in the process of exiting 2949 thr->java_resume(); 2950 } 2951 JVM_END 2952 2953 2954 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2955 JVMWrapper("JVM_SetThreadPriority"); 2956 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2957 MutexLocker ml(Threads_lock); 2958 oop java_thread = JNIHandles::resolve_non_null(jthread); 2959 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2960 JavaThread* thr = java_lang_Thread::thread(java_thread); 2961 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 2962 Thread::set_priority(thr, (ThreadPriority)prio); 2963 } 2964 JVM_END 2965 2966 2967 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2968 JVMWrapper("JVM_Yield"); 2969 if (os::dont_yield()) return; 2970 HOTSPOT_THREAD_YIELD(); 2971 os::naked_yield(); 2972 JVM_END 2973 2974 2975 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2976 JVMWrapper("JVM_Sleep"); 2977 2978 if (millis < 0) { 2979 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2980 } 2981 2982 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2983 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2984 } 2985 2986 // Save current thread state and restore it at the end of this block. 2987 // And set new thread state to SLEEPING. 2988 JavaThreadSleepState jtss(thread); 2989 2990 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 2991 2992 EventThreadSleep event; 2993 2994 if (millis == 0) { 2995 os::naked_yield(); 2996 } else { 2997 ThreadState old_state = thread->osthread()->get_state(); 2998 thread->osthread()->set_state(SLEEPING); 2999 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3000 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3001 // us while we were sleeping. We do not overwrite those. 3002 if (!HAS_PENDING_EXCEPTION) { 3003 if (event.should_commit()) { 3004 event.set_time(millis); 3005 event.commit(); 3006 } 3007 HOTSPOT_THREAD_SLEEP_END(1); 3008 3009 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3010 // to properly restore the thread state. That's likely wrong. 3011 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3012 } 3013 } 3014 thread->osthread()->set_state(old_state); 3015 } 3016 if (event.should_commit()) { 3017 event.set_time(millis); 3018 event.commit(); 3019 } 3020 HOTSPOT_THREAD_SLEEP_END(0); 3021 JVM_END 3022 3023 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3024 JVMWrapper("JVM_CurrentThread"); 3025 oop jthread = thread->threadObj(); 3026 assert (thread != NULL, "no current thread!"); 3027 return JNIHandles::make_local(env, jthread); 3028 JVM_END 3029 3030 3031 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3032 JVMWrapper("JVM_CountStackFrames"); 3033 3034 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3035 oop java_thread = JNIHandles::resolve_non_null(jthread); 3036 bool throw_illegal_thread_state = false; 3037 int count = 0; 3038 3039 { 3040 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3041 // We need to re-resolve the java_thread, since a GC might have happened during the 3042 // acquire of the lock 3043 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3044 3045 if (thr == NULL) { 3046 // do nothing 3047 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 3048 // Check whether this java thread has been suspended already. If not, throws 3049 // IllegalThreadStateException. We defer to throw that exception until 3050 // Threads_lock is released since loading exception class has to leave VM. 3051 // The correct way to test a thread is actually suspended is 3052 // wait_for_ext_suspend_completion(), but we can't call that while holding 3053 // the Threads_lock. The above tests are sufficient for our purposes 3054 // provided the walkability of the stack is stable - which it isn't 3055 // 100% but close enough for most practical purposes. 3056 throw_illegal_thread_state = true; 3057 } else { 3058 // Count all java activation, i.e., number of vframes 3059 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 3060 // Native frames are not counted 3061 if (!vfst.method()->is_native()) count++; 3062 } 3063 } 3064 } 3065 3066 if (throw_illegal_thread_state) { 3067 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3068 "this thread is not suspended"); 3069 } 3070 return count; 3071 JVM_END 3072 3073 // Consider: A better way to implement JVM_Interrupt() is to acquire 3074 // Threads_lock to resolve the jthread into a Thread pointer, fetch 3075 // Thread->platformevent, Thread->native_thr, Thread->parker, etc., 3076 // drop Threads_lock, and the perform the unpark() and thr_kill() operations 3077 // outside the critical section. Threads_lock is hot so we want to minimize 3078 // the hold-time. A cleaner interface would be to decompose interrupt into 3079 // two steps. The 1st phase, performed under Threads_lock, would return 3080 // a closure that'd be invoked after Threads_lock was dropped. 3081 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 3082 // admit spurious wakeups. 3083 3084 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3085 JVMWrapper("JVM_Interrupt"); 3086 3087 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3088 oop java_thread = JNIHandles::resolve_non_null(jthread); 3089 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3090 // We need to re-resolve the java_thread, since a GC might have happened during the 3091 // acquire of the lock 3092 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3093 if (thr != NULL) { 3094 Thread::interrupt(thr); 3095 } 3096 JVM_END 3097 3098 3099 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3100 JVMWrapper("JVM_IsInterrupted"); 3101 3102 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3103 oop java_thread = JNIHandles::resolve_non_null(jthread); 3104 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3105 // We need to re-resolve the java_thread, since a GC might have happened during the 3106 // acquire of the lock 3107 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3108 if (thr == NULL) { 3109 return JNI_FALSE; 3110 } else { 3111 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3112 } 3113 JVM_END 3114 3115 3116 // Return true iff the current thread has locked the object passed in 3117 3118 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3119 JVMWrapper("JVM_HoldsLock"); 3120 assert(THREAD->is_Java_thread(), "sanity check"); 3121 if (obj == NULL) { 3122 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3123 } 3124 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3125 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3126 JVM_END 3127 3128 3129 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3130 JVMWrapper("JVM_DumpAllStacks"); 3131 VM_PrintThreads op; 3132 VMThread::execute(&op); 3133 if (JvmtiExport::should_post_data_dump()) { 3134 JvmtiExport::post_data_dump(); 3135 } 3136 JVM_END 3137 3138 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3139 JVMWrapper("JVM_SetNativeThreadName"); 3140 ResourceMark rm(THREAD); 3141 oop java_thread = JNIHandles::resolve_non_null(jthread); 3142 JavaThread* thr = java_lang_Thread::thread(java_thread); 3143 // Thread naming only supported for the current thread, doesn't work for 3144 // target threads. 3145 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3146 // we don't set the name of an attached thread to avoid stepping 3147 // on other programs 3148 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3149 os::set_native_thread_name(thread_name); 3150 } 3151 JVM_END 3152 3153 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3154 3155 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3156 assert(jthread->is_Java_thread(), "must be a Java thread"); 3157 if (jthread->privileged_stack_top() == NULL) return false; 3158 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3159 oop loader = jthread->privileged_stack_top()->class_loader(); 3160 if (loader == NULL) return true; 3161 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3162 if (trusted) return true; 3163 } 3164 return false; 3165 } 3166 3167 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3168 JVMWrapper("JVM_CurrentLoadedClass"); 3169 ResourceMark rm(THREAD); 3170 3171 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3172 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3173 bool trusted = is_trusted_frame(thread, &vfst); 3174 if (trusted) return NULL; 3175 3176 Method* m = vfst.method(); 3177 if (!m->is_native()) { 3178 InstanceKlass* holder = m->method_holder(); 3179 oop loader = holder->class_loader(); 3180 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3181 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3182 } 3183 } 3184 } 3185 return NULL; 3186 JVM_END 3187 3188 3189 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3190 JVMWrapper("JVM_CurrentClassLoader"); 3191 ResourceMark rm(THREAD); 3192 3193 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3194 3195 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3196 bool trusted = is_trusted_frame(thread, &vfst); 3197 if (trusted) return NULL; 3198 3199 Method* m = vfst.method(); 3200 if (!m->is_native()) { 3201 InstanceKlass* holder = m->method_holder(); 3202 assert(holder->is_klass(), "just checking"); 3203 oop loader = holder->class_loader(); 3204 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3205 return JNIHandles::make_local(env, loader); 3206 } 3207 } 3208 } 3209 return NULL; 3210 JVM_END 3211 3212 3213 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3214 JVMWrapper("JVM_GetClassContext"); 3215 ResourceMark rm(THREAD); 3216 JvmtiVMObjectAllocEventCollector oam; 3217 vframeStream vfst(thread); 3218 3219 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3220 // This must only be called from SecurityManager.getClassContext 3221 Method* m = vfst.method(); 3222 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3223 m->name() == vmSymbols::getClassContext_name() && 3224 m->signature() == vmSymbols::void_class_array_signature())) { 3225 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3226 } 3227 } 3228 3229 // Collect method holders 3230 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3231 for (; !vfst.at_end(); vfst.security_next()) { 3232 Method* m = vfst.method(); 3233 // Native frames are not returned 3234 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3235 Klass* holder = m->method_holder(); 3236 assert(holder->is_klass(), "just checking"); 3237 klass_array->append(holder); 3238 } 3239 } 3240 3241 // Create result array of type [Ljava/lang/Class; 3242 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3243 // Fill in mirrors corresponding to method holders 3244 for (int i = 0; i < klass_array->length(); i++) { 3245 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3246 } 3247 3248 return (jobjectArray) JNIHandles::make_local(env, result); 3249 JVM_END 3250 3251 3252 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3253 JVMWrapper("JVM_ClassDepth"); 3254 ResourceMark rm(THREAD); 3255 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3256 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3257 3258 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3259 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3260 if (class_name_sym == NULL) { 3261 return -1; 3262 } 3263 3264 int depth = 0; 3265 3266 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3267 if (!vfst.method()->is_native()) { 3268 InstanceKlass* holder = vfst.method()->method_holder(); 3269 assert(holder->is_klass(), "just checking"); 3270 if (holder->name() == class_name_sym) { 3271 return depth; 3272 } 3273 depth++; 3274 } 3275 } 3276 return -1; 3277 JVM_END 3278 3279 3280 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3281 JVMWrapper("JVM_ClassLoaderDepth"); 3282 ResourceMark rm(THREAD); 3283 int depth = 0; 3284 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3285 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3286 bool trusted = is_trusted_frame(thread, &vfst); 3287 if (trusted) return -1; 3288 3289 Method* m = vfst.method(); 3290 if (!m->is_native()) { 3291 InstanceKlass* holder = m->method_holder(); 3292 assert(holder->is_klass(), "just checking"); 3293 oop loader = holder->class_loader(); 3294 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3295 return depth; 3296 } 3297 depth++; 3298 } 3299 } 3300 return -1; 3301 JVM_END 3302 3303 3304 // java.lang.Package //////////////////////////////////////////////////////////////// 3305 3306 3307 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3308 JVMWrapper("JVM_GetSystemPackage"); 3309 ResourceMark rm(THREAD); 3310 JvmtiVMObjectAllocEventCollector oam; 3311 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3312 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3313 return (jstring) JNIHandles::make_local(result); 3314 JVM_END 3315 3316 3317 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3318 JVMWrapper("JVM_GetSystemPackages"); 3319 JvmtiVMObjectAllocEventCollector oam; 3320 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3321 return (jobjectArray) JNIHandles::make_local(result); 3322 JVM_END 3323 3324 3325 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3326 3327 3328 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3329 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3330 3331 MonitorLockerEx ml(Heap_lock); 3332 oop ref = Universe::reference_pending_list(); 3333 if (ref != NULL) { 3334 Universe::set_reference_pending_list(NULL); 3335 } 3336 return JNIHandles::make_local(env, ref); 3337 JVM_END 3338 3339 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3340 JVMWrapper("JVM_HasReferencePendingList"); 3341 MonitorLockerEx ml(Heap_lock); 3342 return Universe::has_reference_pending_list(); 3343 JVM_END 3344 3345 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3346 JVMWrapper("JVM_WaitForReferencePendingList"); 3347 MonitorLockerEx ml(Heap_lock); 3348 while (!Universe::has_reference_pending_list()) { 3349 ml.wait(); 3350 } 3351 JVM_END 3352 3353 3354 // ObjectInputStream /////////////////////////////////////////////////////////////// 3355 3356 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3357 if (current_class == NULL) { 3358 return true; 3359 } 3360 if ((current_class == field_class) || access.is_public()) { 3361 return true; 3362 } 3363 3364 if (access.is_protected()) { 3365 // See if current_class is a subclass of field_class 3366 if (current_class->is_subclass_of(field_class)) { 3367 return true; 3368 } 3369 } 3370 3371 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3372 } 3373 3374 // Return the first user-defined class loader up the execution stack, or null 3375 // if only code from the bootstrap or platform class loader is on the stack. 3376 3377 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3378 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3379 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3380 oop loader = vfst.method()->method_holder()->class_loader(); 3381 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3382 return JNIHandles::make_local(env, loader); 3383 } 3384 } 3385 return NULL; 3386 JVM_END 3387 3388 3389 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3390 3391 3392 // resolve array handle and check arguments 3393 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3394 if (arr == NULL) { 3395 THROW_0(vmSymbols::java_lang_NullPointerException()); 3396 } 3397 oop a = JNIHandles::resolve_non_null(arr); 3398 if (!a->is_array()) { 3399 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3400 } else if (type_array_only && !a->is_typeArray()) { 3401 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3402 } 3403 return arrayOop(a); 3404 } 3405 3406 3407 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3408 JVMWrapper("JVM_GetArrayLength"); 3409 arrayOop a = check_array(env, arr, false, CHECK_0); 3410 return a->length(); 3411 JVM_END 3412 3413 3414 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3415 JVMWrapper("JVM_Array_Get"); 3416 JvmtiVMObjectAllocEventCollector oam; 3417 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3418 jvalue value; 3419 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3420 oop box = Reflection::box(&value, type, CHECK_NULL); 3421 return JNIHandles::make_local(env, box); 3422 JVM_END 3423 3424 3425 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3426 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3427 jvalue value; 3428 value.i = 0; // to initialize value before getting used in CHECK 3429 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3430 assert(a->is_typeArray(), "just checking"); 3431 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3432 BasicType wide_type = (BasicType) wCode; 3433 if (type != wide_type) { 3434 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3435 } 3436 return value; 3437 JVM_END 3438 3439 3440 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3441 JVMWrapper("JVM_SetArrayElement"); 3442 arrayOop a = check_array(env, arr, false, CHECK); 3443 oop box = JNIHandles::resolve(val); 3444 jvalue value; 3445 value.i = 0; // to initialize value before getting used in CHECK 3446 BasicType value_type; 3447 if (a->is_objArray()) { 3448 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3449 value_type = Reflection::unbox_for_regular_object(box, &value); 3450 } else { 3451 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3452 } 3453 Reflection::array_set(&value, a, index, value_type, CHECK); 3454 JVM_END 3455 3456 3457 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3458 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3459 arrayOop a = check_array(env, arr, true, CHECK); 3460 assert(a->is_typeArray(), "just checking"); 3461 BasicType value_type = (BasicType) vCode; 3462 Reflection::array_set(&v, a, index, value_type, CHECK); 3463 JVM_END 3464 3465 3466 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3467 JVMWrapper("JVM_NewArray"); 3468 JvmtiVMObjectAllocEventCollector oam; 3469 oop element_mirror = JNIHandles::resolve(eltClass); 3470 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3471 return JNIHandles::make_local(env, result); 3472 JVM_END 3473 3474 3475 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3476 JVMWrapper("JVM_NewMultiArray"); 3477 JvmtiVMObjectAllocEventCollector oam; 3478 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3479 oop element_mirror = JNIHandles::resolve(eltClass); 3480 assert(dim_array->is_typeArray(), "just checking"); 3481 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3482 return JNIHandles::make_local(env, result); 3483 JVM_END 3484 3485 3486 // Library support /////////////////////////////////////////////////////////////////////////// 3487 3488 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3489 //%note jvm_ct 3490 JVMWrapper("JVM_LoadLibrary"); 3491 char ebuf[1024]; 3492 void *load_result; 3493 { 3494 ThreadToNativeFromVM ttnfvm(thread); 3495 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3496 } 3497 if (load_result == NULL) { 3498 char msg[1024]; 3499 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3500 // Since 'ebuf' may contain a string encoded using 3501 // platform encoding scheme, we need to pass 3502 // Exceptions::unsafe_to_utf8 to the new_exception method 3503 // as the last argument. See bug 6367357. 3504 Handle h_exception = 3505 Exceptions::new_exception(thread, 3506 vmSymbols::java_lang_UnsatisfiedLinkError(), 3507 msg, Exceptions::unsafe_to_utf8); 3508 3509 THROW_HANDLE_0(h_exception); 3510 } 3511 return load_result; 3512 JVM_END 3513 3514 3515 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3516 JVMWrapper("JVM_UnloadLibrary"); 3517 os::dll_unload(handle); 3518 JVM_END 3519 3520 3521 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3522 JVMWrapper("JVM_FindLibraryEntry"); 3523 return os::dll_lookup(handle, name); 3524 JVM_END 3525 3526 3527 // JNI version /////////////////////////////////////////////////////////////////////////////// 3528 3529 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3530 JVMWrapper("JVM_IsSupportedJNIVersion"); 3531 return Threads::is_supported_jni_version_including_1_1(version); 3532 JVM_END 3533 3534 3535 // String support /////////////////////////////////////////////////////////////////////////// 3536 3537 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3538 JVMWrapper("JVM_InternString"); 3539 JvmtiVMObjectAllocEventCollector oam; 3540 if (str == NULL) return NULL; 3541 oop string = JNIHandles::resolve_non_null(str); 3542 oop result = StringTable::intern(string, CHECK_NULL); 3543 return (jstring) JNIHandles::make_local(env, result); 3544 JVM_END 3545 3546 3547 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3548 3549 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3550 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3551 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3552 // that only works with java threads. 3553 3554 3555 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3556 VM_Exit::block_if_vm_exited(); 3557 JVMWrapper("JVM_RawMonitorCreate"); 3558 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3559 } 3560 3561 3562 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3563 VM_Exit::block_if_vm_exited(); 3564 JVMWrapper("JVM_RawMonitorDestroy"); 3565 delete ((Mutex*) mon); 3566 } 3567 3568 3569 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3570 VM_Exit::block_if_vm_exited(); 3571 JVMWrapper("JVM_RawMonitorEnter"); 3572 ((Mutex*) mon)->jvm_raw_lock(); 3573 return 0; 3574 } 3575 3576 3577 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3578 VM_Exit::block_if_vm_exited(); 3579 JVMWrapper("JVM_RawMonitorExit"); 3580 ((Mutex*) mon)->jvm_raw_unlock(); 3581 } 3582 3583 3584 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3585 3586 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3587 Handle loader, Handle protection_domain, 3588 jboolean throwError, TRAPS) { 3589 // Security Note: 3590 // The Java level wrapper will perform the necessary security check allowing 3591 // us to pass the NULL as the initiating class loader. The VM is responsible for 3592 // the checkPackageAccess relative to the initiating class loader via the 3593 // protection_domain. The protection_domain is passed as NULL by the java code 3594 // if there is no security manager in 3-arg Class.forName(). 3595 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3596 3597 // Check if we should initialize the class 3598 if (init && klass->is_instance_klass()) { 3599 klass->initialize(CHECK_NULL); 3600 } 3601 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3602 } 3603 3604 3605 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3606 3607 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3608 JVMWrapper("JVM_InvokeMethod"); 3609 Handle method_handle; 3610 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3611 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3612 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3613 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3614 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3615 jobject res = JNIHandles::make_local(env, result); 3616 if (JvmtiExport::should_post_vm_object_alloc()) { 3617 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3618 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3619 if (java_lang_Class::is_primitive(ret_type)) { 3620 // Only for primitive type vm allocates memory for java object. 3621 // See box() method. 3622 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3623 } 3624 } 3625 return res; 3626 } else { 3627 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3628 } 3629 JVM_END 3630 3631 3632 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3633 JVMWrapper("JVM_NewInstanceFromConstructor"); 3634 oop constructor_mirror = JNIHandles::resolve(c); 3635 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3636 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3637 jobject res = JNIHandles::make_local(env, result); 3638 if (JvmtiExport::should_post_vm_object_alloc()) { 3639 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3640 } 3641 return res; 3642 JVM_END 3643 3644 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3645 3646 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3647 JVMWrapper("JVM_SupportsCX8"); 3648 return VM_Version::supports_cx8(); 3649 JVM_END 3650 3651 // Returns an array of all live Thread objects (VM internal JavaThreads, 3652 // jvmti agent threads, and JNI attaching threads are skipped) 3653 // See CR 6404306 regarding JNI attaching threads 3654 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3655 ResourceMark rm(THREAD); 3656 ThreadsListEnumerator tle(THREAD, false, false); 3657 JvmtiVMObjectAllocEventCollector oam; 3658 3659 int num_threads = tle.num_threads(); 3660 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3661 objArrayHandle threads_ah(THREAD, r); 3662 3663 for (int i = 0; i < num_threads; i++) { 3664 Handle h = tle.get_threadObj(i); 3665 threads_ah->obj_at_put(i, h()); 3666 } 3667 3668 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3669 JVM_END 3670 3671 3672 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3673 // Return StackTraceElement[][], each element is the stack trace of a thread in 3674 // the corresponding entry in the given threads array 3675 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3676 JVMWrapper("JVM_DumpThreads"); 3677 JvmtiVMObjectAllocEventCollector oam; 3678 3679 // Check if threads is null 3680 if (threads == NULL) { 3681 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3682 } 3683 3684 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3685 objArrayHandle ah(THREAD, a); 3686 int num_threads = ah->length(); 3687 // check if threads is non-empty array 3688 if (num_threads == 0) { 3689 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3690 } 3691 3692 // check if threads is not an array of objects of Thread class 3693 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3694 if (k != SystemDictionary::Thread_klass()) { 3695 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3696 } 3697 3698 ResourceMark rm(THREAD); 3699 3700 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3701 for (int i = 0; i < num_threads; i++) { 3702 oop thread_obj = ah->obj_at(i); 3703 instanceHandle h(THREAD, (instanceOop) thread_obj); 3704 thread_handle_array->append(h); 3705 } 3706 3707 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3708 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3709 3710 JVM_END 3711 3712 // JVM monitoring and management support 3713 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3714 return Management::get_jmm_interface(version); 3715 JVM_END 3716 3717 // com.sun.tools.attach.VirtualMachine agent properties support 3718 // 3719 // Initialize the agent properties with the properties maintained in the VM 3720 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3721 JVMWrapper("JVM_InitAgentProperties"); 3722 ResourceMark rm; 3723 3724 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3725 3726 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3727 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3728 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3729 return properties; 3730 JVM_END 3731 3732 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3733 { 3734 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3735 JvmtiVMObjectAllocEventCollector oam; 3736 3737 if (ofClass == NULL) { 3738 return NULL; 3739 } 3740 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3741 // Special handling for primitive objects 3742 if (java_lang_Class::is_primitive(mirror())) { 3743 return NULL; 3744 } 3745 Klass* k = java_lang_Class::as_Klass(mirror()); 3746 if (!k->is_instance_klass()) { 3747 return NULL; 3748 } 3749 InstanceKlass* ik = InstanceKlass::cast(k); 3750 int encl_method_class_idx = ik->enclosing_method_class_index(); 3751 if (encl_method_class_idx == 0) { 3752 return NULL; 3753 } 3754 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3755 objArrayHandle dest(THREAD, dest_o); 3756 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3757 dest->obj_at_put(0, enc_k->java_mirror()); 3758 int encl_method_method_idx = ik->enclosing_method_method_index(); 3759 if (encl_method_method_idx != 0) { 3760 Symbol* sym = ik->constants()->symbol_at( 3761 extract_low_short_from_int( 3762 ik->constants()->name_and_type_at(encl_method_method_idx))); 3763 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3764 dest->obj_at_put(1, str()); 3765 sym = ik->constants()->symbol_at( 3766 extract_high_short_from_int( 3767 ik->constants()->name_and_type_at(encl_method_method_idx))); 3768 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3769 dest->obj_at_put(2, str()); 3770 } 3771 return (jobjectArray) JNIHandles::make_local(dest()); 3772 } 3773 JVM_END 3774 3775 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3776 { 3777 memset(info, 0, info_size); 3778 3779 info->jvm_version = Abstract_VM_Version::jvm_version(); 3780 info->patch_version = Abstract_VM_Version::vm_patch_version(); 3781 3782 // when we add a new capability in the jvm_version_info struct, we should also 3783 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3784 // counter defined in runtimeService.cpp. 3785 info->is_attachable = AttachListener::is_attach_supported(); 3786 } 3787 JVM_END 3788 3789 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3790 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3791 ResourceMark rm(THREAD); 3792 3793 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3794 return NULL; 3795 } 3796 3797 char** vm_flags = Arguments::jvm_flags_array(); 3798 char** vm_args = Arguments::jvm_args_array(); 3799 int num_flags = Arguments::num_jvm_flags(); 3800 int num_args = Arguments::num_jvm_args(); 3801 3802 InstanceKlass* ik = SystemDictionary::String_klass(); 3803 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3804 objArrayHandle result_h(THREAD, r); 3805 3806 int index = 0; 3807 for (int j = 0; j < num_flags; j++, index++) { 3808 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3809 result_h->obj_at_put(index, h()); 3810 } 3811 for (int i = 0; i < num_args; i++, index++) { 3812 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3813 result_h->obj_at_put(index, h()); 3814 } 3815 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3816 JVM_END 3817 3818 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3819 return os::get_signal_number(name); 3820 JVM_END