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 // Caution: this involves a java upcall, so the clone should be 677 // "gc-robust" by this stage. 678 if (klass->has_finalizer()) { 679 assert(obj->is_instance(), "should be instanceOop"); 680 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 681 new_obj = Handle(THREAD, new_obj_oop); 682 } 683 684 return JNIHandles::make_local(env, new_obj()); 685 JVM_END 686 687 // java.io.File /////////////////////////////////////////////////////////////// 688 689 JVM_LEAF(char*, JVM_NativePath(char* path)) 690 JVMWrapper("JVM_NativePath"); 691 return os::native_path(path); 692 JVM_END 693 694 695 // Misc. class handling /////////////////////////////////////////////////////////// 696 697 698 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 699 JVMWrapper("JVM_GetCallerClass"); 700 701 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 702 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 703 // temporarily for existing code to use until a replacement API is defined. 704 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 705 Klass* k = thread->security_get_caller_class(depth); 706 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 707 } 708 709 // Getting the class of the caller frame. 710 // 711 // The call stack at this point looks something like this: 712 // 713 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 714 // [1] [ @CallerSensitive API.method ] 715 // [.] [ (skipped intermediate frames) ] 716 // [n] [ caller ] 717 vframeStream vfst(thread); 718 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 719 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 720 Method* m = vfst.method(); 721 assert(m != NULL, "sanity"); 722 switch (n) { 723 case 0: 724 // This must only be called from Reflection.getCallerClass 725 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 726 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 727 } 728 // fall-through 729 case 1: 730 // Frame 0 and 1 must be caller sensitive. 731 if (!m->caller_sensitive()) { 732 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 733 } 734 break; 735 default: 736 if (!m->is_ignored_by_security_stack_walk()) { 737 // We have reached the desired frame; return the holder class. 738 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 739 } 740 break; 741 } 742 } 743 return NULL; 744 JVM_END 745 746 747 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 748 JVMWrapper("JVM_FindPrimitiveClass"); 749 oop mirror = NULL; 750 BasicType t = name2type(utf); 751 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 752 mirror = Universe::java_mirror(t); 753 } 754 if (mirror == NULL) { 755 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 756 } else { 757 return (jclass) JNIHandles::make_local(env, mirror); 758 } 759 JVM_END 760 761 762 // Returns a class loaded by the bootstrap class loader; or null 763 // if not found. ClassNotFoundException is not thrown. 764 // FindClassFromBootLoader is exported to the launcher for windows. 765 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 766 const char* name)) 767 JVMWrapper("JVM_FindClassFromBootLoader"); 768 769 // Java libraries should ensure that name is never null... 770 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 771 // It's impossible to create this class; the name cannot fit 772 // into the constant pool. 773 return NULL; 774 } 775 776 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 777 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 778 if (k == NULL) { 779 return NULL; 780 } 781 782 if (log_is_enabled(Debug, class, resolve)) { 783 trace_class_resolution(k); 784 } 785 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 786 JVM_END 787 788 // Find a class with this name in this loader, using the caller's protection domain. 789 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 790 jboolean init, jobject loader, 791 jclass caller)) 792 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 793 // Java libraries should ensure that name is never null... 794 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 795 // It's impossible to create this class; the name cannot fit 796 // into the constant pool. 797 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 798 } 799 800 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 801 802 oop loader_oop = JNIHandles::resolve(loader); 803 oop from_class = JNIHandles::resolve(caller); 804 oop protection_domain = NULL; 805 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 806 // NPE. Put it in another way, the bootstrap class loader has all permission and 807 // thus no checkPackageAccess equivalence in the VM class loader. 808 // The caller is also passed as NULL by the java code if there is no security 809 // manager to avoid the performance cost of getting the calling class. 810 if (from_class != NULL && loader_oop != NULL) { 811 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 812 } 813 814 Handle h_loader(THREAD, loader_oop); 815 Handle h_prot(THREAD, protection_domain); 816 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 817 h_prot, false, THREAD); 818 819 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 820 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 821 } 822 return result; 823 JVM_END 824 825 // Currently only called from the old verifier. 826 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 827 jboolean init, jclass from)) 828 JVMWrapper("JVM_FindClassFromClass"); 829 if (name == NULL) { 830 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 831 } 832 if ((int)strlen(name) > Symbol::max_length()) { 833 // It's impossible to create this class; the name cannot fit 834 // into the constant pool. 835 Exceptions::fthrow(THREAD_AND_LOCATION, 836 vmSymbols::java_lang_NoClassDefFoundError(), 837 "Class name exceeds maximum length of %d: %s", 838 Symbol::max_length(), 839 name); 840 return 0; 841 } 842 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 843 oop from_class_oop = JNIHandles::resolve(from); 844 Klass* from_class = (from_class_oop == NULL) 845 ? (Klass*)NULL 846 : java_lang_Class::as_Klass(from_class_oop); 847 oop class_loader = NULL; 848 oop protection_domain = NULL; 849 if (from_class != NULL) { 850 class_loader = from_class->class_loader(); 851 protection_domain = from_class->protection_domain(); 852 } 853 Handle h_loader(THREAD, class_loader); 854 Handle h_prot (THREAD, protection_domain); 855 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 856 h_prot, true, thread); 857 858 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 859 // this function is generally only used for class loading during verification. 860 ResourceMark rm; 861 oop from_mirror = JNIHandles::resolve_non_null(from); 862 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 863 const char * from_name = from_class->external_name(); 864 865 oop mirror = JNIHandles::resolve_non_null(result); 866 Klass* to_class = java_lang_Class::as_Klass(mirror); 867 const char * to = to_class->external_name(); 868 log_debug(class, resolve)("%s %s (verification)", from_name, to); 869 } 870 871 return result; 872 JVM_END 873 874 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 875 if (loader.is_null()) { 876 return; 877 } 878 879 // check whether the current caller thread holds the lock or not. 880 // If not, increment the corresponding counter 881 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 882 ObjectSynchronizer::owner_self) { 883 counter->inc(); 884 } 885 } 886 887 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 888 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 889 jobject loader, const jbyte *buf, 890 jsize len, jobject pd, const char *source, 891 TRAPS) { 892 if (source == NULL) source = "__JVM_DefineClass__"; 893 894 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 895 JavaThread* jt = (JavaThread*) THREAD; 896 897 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 898 ClassLoader::perf_define_appclass_selftime(), 899 ClassLoader::perf_define_appclasses(), 900 jt->get_thread_stat()->perf_recursion_counts_addr(), 901 jt->get_thread_stat()->perf_timers_addr(), 902 PerfClassTraceTime::DEFINE_CLASS); 903 904 if (UsePerfData) { 905 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 906 } 907 908 // Since exceptions can be thrown, class initialization can take place 909 // if name is NULL no check for class name in .class stream has to be made. 910 TempNewSymbol class_name = NULL; 911 if (name != NULL) { 912 const int str_len = (int)strlen(name); 913 if (str_len > Symbol::max_length()) { 914 // It's impossible to create this class; the name cannot fit 915 // into the constant pool. 916 Exceptions::fthrow(THREAD_AND_LOCATION, 917 vmSymbols::java_lang_NoClassDefFoundError(), 918 "Class name exceeds maximum length of %d: %s", 919 Symbol::max_length(), 920 name); 921 return 0; 922 } 923 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 924 } 925 926 ResourceMark rm(THREAD); 927 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 928 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 929 if (UsePerfData) { 930 is_lock_held_by_thread(class_loader, 931 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 932 THREAD); 933 } 934 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 935 Klass* k = SystemDictionary::resolve_from_stream(class_name, 936 class_loader, 937 protection_domain, 938 &st, 939 CHECK_NULL); 940 941 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 942 trace_class_resolution(k); 943 } 944 945 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 946 } 947 948 949 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 950 JVMWrapper("JVM_DefineClass"); 951 952 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 953 JVM_END 954 955 956 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 957 JVMWrapper("JVM_DefineClassWithSource"); 958 959 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 960 JVM_END 961 962 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 963 JVMWrapper("JVM_FindLoadedClass"); 964 ResourceMark rm(THREAD); 965 966 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 967 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 968 969 const char* str = java_lang_String::as_utf8_string(string()); 970 // Sanity check, don't expect null 971 if (str == NULL) return NULL; 972 973 const int str_len = (int)strlen(str); 974 if (str_len > Symbol::max_length()) { 975 // It's impossible to create this class; the name cannot fit 976 // into the constant pool. 977 return NULL; 978 } 979 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 980 981 // Security Note: 982 // The Java level wrapper will perform the necessary security check allowing 983 // us to pass the NULL as the initiating class loader. 984 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 985 if (UsePerfData) { 986 is_lock_held_by_thread(h_loader, 987 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 988 THREAD); 989 } 990 991 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 992 h_loader, 993 Handle(), 994 CHECK_NULL); 995 #if INCLUDE_CDS 996 if (k == NULL) { 997 // If the class is not already loaded, try to see if it's in the shared 998 // archive for the current classloader (h_loader). 999 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1000 } 1001 #endif 1002 return (k == NULL) ? NULL : 1003 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1004 JVM_END 1005 1006 // Module support ////////////////////////////////////////////////////////////////////////////// 1007 1008 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1009 jstring location, const char* const* packages, jsize num_packages)) 1010 JVMWrapper("JVM_DefineModule"); 1011 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1012 JVM_END 1013 1014 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1015 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1016 Modules::set_bootloader_unnamed_module(module, CHECK); 1017 JVM_END 1018 1019 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1020 JVMWrapper("JVM_AddModuleExports"); 1021 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1022 JVM_END 1023 1024 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1025 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1026 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1027 JVM_END 1028 1029 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1030 JVMWrapper("JVM_AddModuleExportsToAll"); 1031 Modules::add_module_exports(from_module, package, NULL, CHECK); 1032 JVM_END 1033 1034 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1035 JVMWrapper("JVM_AddReadsModule"); 1036 Modules::add_reads_module(from_module, source_module, CHECK); 1037 JVM_END 1038 1039 JVM_ENTRY (void, JVM_AddModulePackage(JNIEnv *env, jobject module, const char* package)) 1040 JVMWrapper("JVM_AddModulePackage"); 1041 Modules::add_module_package(module, package, CHECK); 1042 JVM_END 1043 1044 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1045 1046 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1047 assert (cls != NULL, "illegal class"); 1048 JVMWrapper("JVM_GetClassName"); 1049 JvmtiVMObjectAllocEventCollector oam; 1050 ResourceMark rm(THREAD); 1051 const char* name; 1052 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1053 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1054 } else { 1055 // Consider caching interned string in Klass 1056 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1057 assert(k->is_klass(), "just checking"); 1058 name = k->external_name(); 1059 } 1060 oop result = StringTable::intern((char*) name, CHECK_NULL); 1061 return (jstring) JNIHandles::make_local(env, result); 1062 JVM_END 1063 1064 1065 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1066 JVMWrapper("JVM_GetClassInterfaces"); 1067 JvmtiVMObjectAllocEventCollector oam; 1068 oop mirror = JNIHandles::resolve_non_null(cls); 1069 1070 // Special handling for primitive objects 1071 if (java_lang_Class::is_primitive(mirror)) { 1072 // Primitive objects does not have any interfaces 1073 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1074 return (jobjectArray) JNIHandles::make_local(env, r); 1075 } 1076 1077 Klass* klass = java_lang_Class::as_Klass(mirror); 1078 // Figure size of result array 1079 int size; 1080 if (klass->is_instance_klass()) { 1081 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1082 } else { 1083 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1084 size = 2; 1085 } 1086 1087 // Allocate result array 1088 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1089 objArrayHandle result (THREAD, r); 1090 // Fill in result 1091 if (klass->is_instance_klass()) { 1092 // Regular instance klass, fill in all local interfaces 1093 for (int index = 0; index < size; index++) { 1094 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1095 result->obj_at_put(index, k->java_mirror()); 1096 } 1097 } else { 1098 // All arrays implement java.lang.Cloneable and java.io.Serializable 1099 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1100 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1101 } 1102 return (jobjectArray) JNIHandles::make_local(env, result()); 1103 JVM_END 1104 1105 1106 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1107 JVMWrapper("JVM_IsInterface"); 1108 oop mirror = JNIHandles::resolve_non_null(cls); 1109 if (java_lang_Class::is_primitive(mirror)) { 1110 return JNI_FALSE; 1111 } 1112 Klass* k = java_lang_Class::as_Klass(mirror); 1113 jboolean result = k->is_interface(); 1114 assert(!result || k->is_instance_klass(), 1115 "all interfaces are instance types"); 1116 // The compiler intrinsic for isInterface tests the 1117 // Klass::_access_flags bits in the same way. 1118 return result; 1119 JVM_END 1120 1121 1122 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1123 JVMWrapper("JVM_GetClassSigners"); 1124 JvmtiVMObjectAllocEventCollector oam; 1125 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1126 // There are no signers for primitive types 1127 return NULL; 1128 } 1129 1130 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1131 1132 // If there are no signers set in the class, or if the class 1133 // is an array, return NULL. 1134 if (signers == NULL) return NULL; 1135 1136 // copy of the signers array 1137 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1138 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1139 for (int index = 0; index < signers->length(); index++) { 1140 signers_copy->obj_at_put(index, signers->obj_at(index)); 1141 } 1142 1143 // return the copy 1144 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1145 JVM_END 1146 1147 1148 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1149 JVMWrapper("JVM_SetClassSigners"); 1150 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1151 // This call is ignored for primitive types and arrays. 1152 // Signers are only set once, ClassLoader.java, and thus shouldn't 1153 // be called with an array. Only the bootstrap loader creates arrays. 1154 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1155 if (k->is_instance_klass()) { 1156 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1157 } 1158 } 1159 JVM_END 1160 1161 1162 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1163 JVMWrapper("JVM_GetProtectionDomain"); 1164 if (JNIHandles::resolve(cls) == NULL) { 1165 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1166 } 1167 1168 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1169 // Primitive types does not have a protection domain. 1170 return NULL; 1171 } 1172 1173 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1174 return (jobject) JNIHandles::make_local(env, pd); 1175 JVM_END 1176 1177 1178 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) { 1179 // If there is a security manager and protection domain, check the access 1180 // in the protection domain, otherwise it is authorized. 1181 if (java_lang_System::has_security_manager()) { 1182 1183 // For bootstrapping, if pd implies method isn't in the JDK, allow 1184 // this context to revert to older behavior. 1185 // In this case the isAuthorized field in AccessControlContext is also not 1186 // present. 1187 if (Universe::protection_domain_implies_method() == NULL) { 1188 return true; 1189 } 1190 1191 // Whitelist certain access control contexts 1192 if (java_security_AccessControlContext::is_authorized(context)) { 1193 return true; 1194 } 1195 1196 oop prot = klass->protection_domain(); 1197 if (prot != NULL) { 1198 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1199 // in the new wrapper. 1200 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1201 Handle h_prot(THREAD, prot); 1202 JavaValue result(T_BOOLEAN); 1203 JavaCallArguments args(h_prot); 1204 JavaCalls::call(&result, m, &args, CHECK_false); 1205 return (result.get_jboolean() != 0); 1206 } 1207 } 1208 return true; 1209 } 1210 1211 // Create an AccessControlContext with a protection domain with null codesource 1212 // and null permissions - which gives no permissions. 1213 oop create_dummy_access_control_context(TRAPS) { 1214 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1215 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1216 // Call constructor ProtectionDomain(null, null); 1217 JavaValue result(T_VOID); 1218 JavaCalls::call_special(&result, obj, pd_klass, 1219 vmSymbols::object_initializer_name(), 1220 vmSymbols::codesource_permissioncollection_signature(), 1221 Handle(), Handle(), CHECK_NULL); 1222 1223 // new ProtectionDomain[] {pd}; 1224 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1225 context->obj_at_put(0, obj()); 1226 1227 // new AccessControlContext(new ProtectionDomain[] {pd}) 1228 objArrayHandle h_context(THREAD, context); 1229 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1230 return acc; 1231 } 1232 1233 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1234 JVMWrapper("JVM_DoPrivileged"); 1235 1236 if (action == NULL) { 1237 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1238 } 1239 1240 // Compute the frame initiating the do privileged operation and setup the privileged stack 1241 vframeStream vfst(thread); 1242 vfst.security_get_caller_frame(1); 1243 1244 if (vfst.at_end()) { 1245 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1246 } 1247 1248 Method* method = vfst.method(); 1249 InstanceKlass* klass = method->method_holder(); 1250 1251 // Check that action object understands "Object run()" 1252 Handle h_context; 1253 if (context != NULL) { 1254 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1255 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1256 if (!authorized) { 1257 // Create an unprivileged access control object and call it's run function 1258 // instead. 1259 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1260 h_context = Handle(THREAD, noprivs); 1261 } 1262 } 1263 1264 // Check that action object understands "Object run()" 1265 Handle object (THREAD, JNIHandles::resolve(action)); 1266 1267 // get run() method 1268 Method* m_oop = object->klass()->uncached_lookup_method( 1269 vmSymbols::run_method_name(), 1270 vmSymbols::void_object_signature(), 1271 Klass::find_overpass); 1272 methodHandle m (THREAD, m_oop); 1273 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { 1274 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1275 } 1276 1277 // Stack allocated list of privileged stack elements 1278 PrivilegedElement pi; 1279 if (!vfst.at_end()) { 1280 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1281 thread->set_privileged_stack_top(&pi); 1282 } 1283 1284 1285 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1286 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1287 Handle pending_exception; 1288 JavaValue result(T_OBJECT); 1289 JavaCallArguments args(object); 1290 JavaCalls::call(&result, m, &args, THREAD); 1291 1292 // done with action, remove ourselves from the list 1293 if (!vfst.at_end()) { 1294 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1295 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1296 } 1297 1298 if (HAS_PENDING_EXCEPTION) { 1299 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1300 CLEAR_PENDING_EXCEPTION; 1301 // JVMTI has already reported the pending exception 1302 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1303 if (THREAD->is_Java_thread()) { 1304 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1305 } 1306 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1307 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1308 // Throw a java.security.PrivilegedActionException(Exception e) exception 1309 JavaCallArguments args(pending_exception); 1310 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1311 vmSymbols::exception_void_signature(), 1312 &args); 1313 } 1314 } 1315 1316 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1317 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1318 JVM_END 1319 1320 1321 // Returns the inherited_access_control_context field of the running thread. 1322 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1323 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1324 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1325 return JNIHandles::make_local(env, result); 1326 JVM_END 1327 1328 class RegisterArrayForGC { 1329 private: 1330 JavaThread *_thread; 1331 public: 1332 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1333 _thread = thread; 1334 _thread->register_array_for_gc(array); 1335 } 1336 1337 ~RegisterArrayForGC() { 1338 _thread->register_array_for_gc(NULL); 1339 } 1340 }; 1341 1342 1343 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1344 JVMWrapper("JVM_GetStackAccessControlContext"); 1345 if (!UsePrivilegedStack) return NULL; 1346 1347 ResourceMark rm(THREAD); 1348 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1349 JvmtiVMObjectAllocEventCollector oam; 1350 1351 // count the protection domains on the execution stack. We collapse 1352 // duplicate consecutive protection domains into a single one, as 1353 // well as stopping when we hit a privileged frame. 1354 1355 // Use vframeStream to iterate through Java frames 1356 vframeStream vfst(thread); 1357 1358 oop previous_protection_domain = NULL; 1359 Handle privileged_context(thread, NULL); 1360 bool is_privileged = false; 1361 oop protection_domain = NULL; 1362 1363 for(; !vfst.at_end(); vfst.next()) { 1364 // get method of frame 1365 Method* method = vfst.method(); 1366 intptr_t* frame_id = vfst.frame_id(); 1367 1368 // check the privileged frames to see if we have a match 1369 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1370 // this frame is privileged 1371 is_privileged = true; 1372 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1373 protection_domain = thread->privileged_stack_top()->protection_domain(); 1374 } else { 1375 protection_domain = method->method_holder()->protection_domain(); 1376 } 1377 1378 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1379 local_array->push(protection_domain); 1380 previous_protection_domain = protection_domain; 1381 } 1382 1383 if (is_privileged) break; 1384 } 1385 1386 1387 // either all the domains on the stack were system domains, or 1388 // we had a privileged system domain 1389 if (local_array->is_empty()) { 1390 if (is_privileged && privileged_context.is_null()) return NULL; 1391 1392 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1393 return JNIHandles::make_local(env, result); 1394 } 1395 1396 // the resource area must be registered in case of a gc 1397 RegisterArrayForGC ragc(thread, local_array); 1398 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1399 local_array->length(), CHECK_NULL); 1400 objArrayHandle h_context(thread, context); 1401 for (int index = 0; index < local_array->length(); index++) { 1402 h_context->obj_at_put(index, local_array->at(index)); 1403 } 1404 1405 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1406 1407 return JNIHandles::make_local(env, result); 1408 JVM_END 1409 1410 1411 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1412 JVMWrapper("JVM_IsArrayClass"); 1413 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1414 return (k != NULL) && k->is_array_klass() ? true : false; 1415 JVM_END 1416 1417 1418 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1419 JVMWrapper("JVM_IsPrimitiveClass"); 1420 oop mirror = JNIHandles::resolve_non_null(cls); 1421 return (jboolean) java_lang_Class::is_primitive(mirror); 1422 JVM_END 1423 1424 1425 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1426 JVMWrapper("JVM_GetClassModifiers"); 1427 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1428 // Primitive type 1429 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1430 } 1431 1432 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1433 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1434 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1435 return k->modifier_flags(); 1436 JVM_END 1437 1438 1439 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1440 1441 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1442 JvmtiVMObjectAllocEventCollector oam; 1443 // ofClass is a reference to a java_lang_Class object. The mirror object 1444 // of an InstanceKlass 1445 1446 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1447 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1448 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1449 return (jobjectArray)JNIHandles::make_local(env, result); 1450 } 1451 1452 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1453 InnerClassesIterator iter(k); 1454 1455 if (iter.length() == 0) { 1456 // Neither an inner nor outer class 1457 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1458 return (jobjectArray)JNIHandles::make_local(env, result); 1459 } 1460 1461 // find inner class info 1462 constantPoolHandle cp(thread, k->constants()); 1463 int length = iter.length(); 1464 1465 // Allocate temp. result array 1466 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1467 objArrayHandle result (THREAD, r); 1468 int members = 0; 1469 1470 for (; !iter.done(); iter.next()) { 1471 int ioff = iter.inner_class_info_index(); 1472 int ooff = iter.outer_class_info_index(); 1473 1474 if (ioff != 0 && ooff != 0) { 1475 // Check to see if the name matches the class we're looking for 1476 // before attempting to find the class. 1477 if (cp->klass_name_at_matches(k, ooff)) { 1478 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1479 if (outer_klass == k) { 1480 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1481 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1482 1483 // Throws an exception if outer klass has not declared k as 1484 // an inner klass 1485 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1486 1487 result->obj_at_put(members, inner_klass->java_mirror()); 1488 members++; 1489 } 1490 } 1491 } 1492 } 1493 1494 if (members != length) { 1495 // Return array of right length 1496 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1497 for(int i = 0; i < members; i++) { 1498 res->obj_at_put(i, result->obj_at(i)); 1499 } 1500 return (jobjectArray)JNIHandles::make_local(env, res); 1501 } 1502 1503 return (jobjectArray)JNIHandles::make_local(env, result()); 1504 JVM_END 1505 1506 1507 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1508 { 1509 // ofClass is a reference to a java_lang_Class object. 1510 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1511 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1512 return NULL; 1513 } 1514 1515 bool inner_is_member = false; 1516 Klass* outer_klass 1517 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1518 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1519 if (outer_klass == NULL) return NULL; // already a top-level class 1520 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1521 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1522 } 1523 JVM_END 1524 1525 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1526 { 1527 oop mirror = JNIHandles::resolve_non_null(cls); 1528 if (java_lang_Class::is_primitive(mirror) || 1529 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1530 return NULL; 1531 } 1532 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1533 int ooff = 0, noff = 0; 1534 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1535 if (noff != 0) { 1536 constantPoolHandle i_cp(thread, k->constants()); 1537 Symbol* name = i_cp->symbol_at(noff); 1538 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1539 return (jstring) JNIHandles::make_local(env, str()); 1540 } 1541 } 1542 return NULL; 1543 } 1544 JVM_END 1545 1546 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1547 assert (cls != NULL, "illegal class"); 1548 JVMWrapper("JVM_GetClassSignature"); 1549 JvmtiVMObjectAllocEventCollector oam; 1550 ResourceMark rm(THREAD); 1551 // Return null for arrays and primatives 1552 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1553 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1554 if (k->is_instance_klass()) { 1555 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1556 if (sym == NULL) return NULL; 1557 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1558 return (jstring) JNIHandles::make_local(env, str()); 1559 } 1560 } 1561 return NULL; 1562 JVM_END 1563 1564 1565 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1566 assert (cls != NULL, "illegal class"); 1567 JVMWrapper("JVM_GetClassAnnotations"); 1568 1569 // Return null for arrays and primitives 1570 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1572 if (k->is_instance_klass()) { 1573 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1574 return (jbyteArray) JNIHandles::make_local(env, a); 1575 } 1576 } 1577 return NULL; 1578 JVM_END 1579 1580 1581 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1582 // some of this code was adapted from from jni_FromReflectedField 1583 1584 oop reflected = JNIHandles::resolve_non_null(field); 1585 oop mirror = java_lang_reflect_Field::clazz(reflected); 1586 Klass* k = java_lang_Class::as_Klass(mirror); 1587 int slot = java_lang_reflect_Field::slot(reflected); 1588 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1589 1590 InstanceKlass* ik = InstanceKlass::cast(k); 1591 intptr_t offset = ik->field_offset(slot); 1592 1593 if (modifiers & JVM_ACC_STATIC) { 1594 // for static fields we only look in the current class 1595 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1596 assert(false, "cannot find static field"); 1597 return false; 1598 } 1599 } else { 1600 // for instance fields we start with the current class and work 1601 // our way up through the superclass chain 1602 if (!ik->find_field_from_offset(offset, false, &fd)) { 1603 assert(false, "cannot find instance field"); 1604 return false; 1605 } 1606 } 1607 return true; 1608 } 1609 1610 static Method* jvm_get_method_common(jobject method) { 1611 // some of this code was adapted from from jni_FromReflectedMethod 1612 1613 oop reflected = JNIHandles::resolve_non_null(method); 1614 oop mirror = NULL; 1615 int slot = 0; 1616 1617 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1618 mirror = java_lang_reflect_Constructor::clazz(reflected); 1619 slot = java_lang_reflect_Constructor::slot(reflected); 1620 } else { 1621 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1622 "wrong type"); 1623 mirror = java_lang_reflect_Method::clazz(reflected); 1624 slot = java_lang_reflect_Method::slot(reflected); 1625 } 1626 Klass* k = java_lang_Class::as_Klass(mirror); 1627 1628 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1629 assert(m != NULL, "cannot find method"); 1630 return m; // caller has to deal with NULL in product mode 1631 } 1632 1633 /* Type use annotations support (JDK 1.8) */ 1634 1635 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1636 assert (cls != NULL, "illegal class"); 1637 JVMWrapper("JVM_GetClassTypeAnnotations"); 1638 ResourceMark rm(THREAD); 1639 // Return null for arrays and primitives 1640 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1641 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1642 if (k->is_instance_klass()) { 1643 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1644 if (type_annotations != NULL) { 1645 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1646 return (jbyteArray) JNIHandles::make_local(env, a); 1647 } 1648 } 1649 } 1650 return NULL; 1651 JVM_END 1652 1653 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1654 assert (method != NULL, "illegal method"); 1655 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1656 1657 // method is a handle to a java.lang.reflect.Method object 1658 Method* m = jvm_get_method_common(method); 1659 if (m == NULL) { 1660 return NULL; 1661 } 1662 1663 AnnotationArray* type_annotations = m->type_annotations(); 1664 if (type_annotations != NULL) { 1665 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1666 return (jbyteArray) JNIHandles::make_local(env, a); 1667 } 1668 1669 return NULL; 1670 JVM_END 1671 1672 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1673 assert (field != NULL, "illegal field"); 1674 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1675 1676 fieldDescriptor fd; 1677 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1678 if (!gotFd) { 1679 return NULL; 1680 } 1681 1682 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1683 JVM_END 1684 1685 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { 1686 if (!cp->is_within_bounds(index)) { 1687 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1688 } 1689 } 1690 1691 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1692 { 1693 JVMWrapper("JVM_GetMethodParameters"); 1694 // method is a handle to a java.lang.reflect.Method object 1695 Method* method_ptr = jvm_get_method_common(method); 1696 methodHandle mh (THREAD, method_ptr); 1697 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1698 const int num_params = mh->method_parameters_length(); 1699 1700 if (num_params < 0) { 1701 // A -1 return value from method_parameters_length means there is no 1702 // parameter data. Return null to indicate this to the reflection 1703 // API. 1704 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1705 return (jobjectArray)NULL; 1706 } else { 1707 // Otherwise, we return something up to reflection, even if it is 1708 // a zero-length array. Why? Because in some cases this can 1709 // trigger a MalformedParametersException. 1710 1711 // make sure all the symbols are properly formatted 1712 for (int i = 0; i < num_params; i++) { 1713 MethodParametersElement* params = mh->method_parameters_start(); 1714 int index = params[i].name_cp_index; 1715 bounds_check(mh->constants(), index, CHECK_NULL); 1716 1717 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1718 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1719 "Wrong type at constant pool index"); 1720 } 1721 1722 } 1723 1724 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1725 objArrayHandle result (THREAD, result_oop); 1726 1727 for (int i = 0; i < num_params; i++) { 1728 MethodParametersElement* params = mh->method_parameters_start(); 1729 // For a 0 index, give a NULL symbol 1730 Symbol* sym = 0 != params[i].name_cp_index ? 1731 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1732 int flags = params[i].flags; 1733 oop param = Reflection::new_parameter(reflected_method, i, sym, 1734 flags, CHECK_NULL); 1735 result->obj_at_put(i, param); 1736 } 1737 return (jobjectArray)JNIHandles::make_local(env, result()); 1738 } 1739 } 1740 JVM_END 1741 1742 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1743 1744 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1745 { 1746 JVMWrapper("JVM_GetClassDeclaredFields"); 1747 JvmtiVMObjectAllocEventCollector oam; 1748 1749 // Exclude primitive types and array types 1750 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1751 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1752 // Return empty array 1753 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1754 return (jobjectArray) JNIHandles::make_local(env, res); 1755 } 1756 1757 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1758 constantPoolHandle cp(THREAD, k->constants()); 1759 1760 // Ensure class is linked 1761 k->link_class(CHECK_NULL); 1762 1763 // Allocate result 1764 int num_fields; 1765 1766 if (publicOnly) { 1767 num_fields = 0; 1768 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1769 if (fs.access_flags().is_public()) ++num_fields; 1770 } 1771 } else { 1772 num_fields = k->java_fields_count(); 1773 } 1774 1775 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1776 objArrayHandle result (THREAD, r); 1777 1778 int out_idx = 0; 1779 fieldDescriptor fd; 1780 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1781 if (!publicOnly || fs.access_flags().is_public()) { 1782 fd.reinitialize(k, fs.index()); 1783 oop field = Reflection::new_field(&fd, CHECK_NULL); 1784 result->obj_at_put(out_idx, field); 1785 ++out_idx; 1786 } 1787 } 1788 assert(out_idx == num_fields, "just checking"); 1789 return (jobjectArray) JNIHandles::make_local(env, result()); 1790 } 1791 JVM_END 1792 1793 static bool select_method(methodHandle method, bool want_constructor) { 1794 if (want_constructor) { 1795 return (method->is_initializer() && !method->is_static()); 1796 } else { 1797 return (!method->is_initializer() && !method->is_overpass()); 1798 } 1799 } 1800 1801 static jobjectArray get_class_declared_methods_helper( 1802 JNIEnv *env, 1803 jclass ofClass, jboolean publicOnly, 1804 bool want_constructor, 1805 Klass* klass, TRAPS) { 1806 1807 JvmtiVMObjectAllocEventCollector oam; 1808 1809 // Exclude primitive types and array types 1810 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1811 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1812 // Return empty array 1813 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1814 return (jobjectArray) JNIHandles::make_local(env, res); 1815 } 1816 1817 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1818 1819 // Ensure class is linked 1820 k->link_class(CHECK_NULL); 1821 1822 Array<Method*>* methods = k->methods(); 1823 int methods_length = methods->length(); 1824 1825 // Save original method_idnum in case of redefinition, which can change 1826 // the idnum of obsolete methods. The new method will have the same idnum 1827 // but if we refresh the methods array, the counts will be wrong. 1828 ResourceMark rm(THREAD); 1829 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1830 int num_methods = 0; 1831 1832 for (int i = 0; i < methods_length; i++) { 1833 methodHandle method(THREAD, methods->at(i)); 1834 if (select_method(method, want_constructor)) { 1835 if (!publicOnly || method->is_public()) { 1836 idnums->push(method->method_idnum()); 1837 ++num_methods; 1838 } 1839 } 1840 } 1841 1842 // Allocate result 1843 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1844 objArrayHandle result (THREAD, r); 1845 1846 // Now just put the methods that we selected above, but go by their idnum 1847 // in case of redefinition. The methods can be redefined at any safepoint, 1848 // so above when allocating the oop array and below when creating reflect 1849 // objects. 1850 for (int i = 0; i < num_methods; i++) { 1851 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1852 if (method.is_null()) { 1853 // Method may have been deleted and seems this API can handle null 1854 // Otherwise should probably put a method that throws NSME 1855 result->obj_at_put(i, NULL); 1856 } else { 1857 oop m; 1858 if (want_constructor) { 1859 m = Reflection::new_constructor(method, CHECK_NULL); 1860 } else { 1861 m = Reflection::new_method(method, false, CHECK_NULL); 1862 } 1863 result->obj_at_put(i, m); 1864 } 1865 } 1866 1867 return (jobjectArray) JNIHandles::make_local(env, result()); 1868 } 1869 1870 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1871 { 1872 JVMWrapper("JVM_GetClassDeclaredMethods"); 1873 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1874 /*want_constructor*/ false, 1875 SystemDictionary::reflect_Method_klass(), THREAD); 1876 } 1877 JVM_END 1878 1879 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1880 { 1881 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1882 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1883 /*want_constructor*/ true, 1884 SystemDictionary::reflect_Constructor_klass(), THREAD); 1885 } 1886 JVM_END 1887 1888 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1889 { 1890 JVMWrapper("JVM_GetClassAccessFlags"); 1891 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1892 // Primitive type 1893 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1894 } 1895 1896 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1897 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1898 } 1899 JVM_END 1900 1901 1902 // Constant pool access ////////////////////////////////////////////////////////// 1903 1904 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1905 { 1906 JVMWrapper("JVM_GetClassConstantPool"); 1907 JvmtiVMObjectAllocEventCollector oam; 1908 1909 // Return null for primitives and arrays 1910 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1911 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1912 if (k->is_instance_klass()) { 1913 InstanceKlass* k_h = InstanceKlass::cast(k); 1914 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1915 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1916 return JNIHandles::make_local(jcp()); 1917 } 1918 } 1919 return NULL; 1920 } 1921 JVM_END 1922 1923 1924 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1925 { 1926 JVMWrapper("JVM_ConstantPoolGetSize"); 1927 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1928 return cp->length(); 1929 } 1930 JVM_END 1931 1932 1933 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1934 { 1935 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1936 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1937 bounds_check(cp, index, CHECK_NULL); 1938 constantTag tag = cp->tag_at(index); 1939 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1940 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1941 } 1942 Klass* k = cp->klass_at(index, CHECK_NULL); 1943 return (jclass) JNIHandles::make_local(k->java_mirror()); 1944 } 1945 JVM_END 1946 1947 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1948 { 1949 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1950 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1951 bounds_check(cp, index, CHECK_NULL); 1952 constantTag tag = cp->tag_at(index); 1953 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1954 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1955 } 1956 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1957 if (k == NULL) return NULL; 1958 return (jclass) JNIHandles::make_local(k->java_mirror()); 1959 } 1960 JVM_END 1961 1962 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1963 constantTag tag = cp->tag_at(index); 1964 if (!tag.is_method() && !tag.is_interface_method()) { 1965 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1966 } 1967 int klass_ref = cp->uncached_klass_ref_index_at(index); 1968 Klass* k_o; 1969 if (force_resolution) { 1970 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1971 } else { 1972 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1973 if (k_o == NULL) return NULL; 1974 } 1975 InstanceKlass* k = InstanceKlass::cast(k_o); 1976 Symbol* name = cp->uncached_name_ref_at(index); 1977 Symbol* sig = cp->uncached_signature_ref_at(index); 1978 methodHandle m (THREAD, k->find_method(name, sig)); 1979 if (m.is_null()) { 1980 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1981 } 1982 oop method; 1983 if (!m->is_initializer() || m->is_static()) { 1984 method = Reflection::new_method(m, true, CHECK_NULL); 1985 } else { 1986 method = Reflection::new_constructor(m, CHECK_NULL); 1987 } 1988 return JNIHandles::make_local(method); 1989 } 1990 1991 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1992 { 1993 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1994 JvmtiVMObjectAllocEventCollector oam; 1995 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1996 bounds_check(cp, index, CHECK_NULL); 1997 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1998 return res; 1999 } 2000 JVM_END 2001 2002 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2003 { 2004 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2005 JvmtiVMObjectAllocEventCollector oam; 2006 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2007 bounds_check(cp, index, CHECK_NULL); 2008 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2009 return res; 2010 } 2011 JVM_END 2012 2013 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2014 constantTag tag = cp->tag_at(index); 2015 if (!tag.is_field()) { 2016 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2017 } 2018 int klass_ref = cp->uncached_klass_ref_index_at(index); 2019 Klass* k_o; 2020 if (force_resolution) { 2021 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2022 } else { 2023 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2024 if (k_o == NULL) return NULL; 2025 } 2026 InstanceKlass* k = InstanceKlass::cast(k_o); 2027 Symbol* name = cp->uncached_name_ref_at(index); 2028 Symbol* sig = cp->uncached_signature_ref_at(index); 2029 fieldDescriptor fd; 2030 Klass* target_klass = k->find_field(name, sig, &fd); 2031 if (target_klass == NULL) { 2032 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2033 } 2034 oop field = Reflection::new_field(&fd, CHECK_NULL); 2035 return JNIHandles::make_local(field); 2036 } 2037 2038 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2039 { 2040 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2041 JvmtiVMObjectAllocEventCollector oam; 2042 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2043 bounds_check(cp, index, CHECK_NULL); 2044 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2045 return res; 2046 } 2047 JVM_END 2048 2049 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2050 { 2051 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2052 JvmtiVMObjectAllocEventCollector oam; 2053 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2054 bounds_check(cp, index, CHECK_NULL); 2055 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2056 return res; 2057 } 2058 JVM_END 2059 2060 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2061 { 2062 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2063 JvmtiVMObjectAllocEventCollector oam; 2064 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2065 bounds_check(cp, index, CHECK_NULL); 2066 constantTag tag = cp->tag_at(index); 2067 if (!tag.is_field_or_method()) { 2068 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2069 } 2070 int klass_ref = cp->uncached_klass_ref_index_at(index); 2071 Symbol* klass_name = cp->klass_name_at(klass_ref); 2072 Symbol* member_name = cp->uncached_name_ref_at(index); 2073 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2074 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2075 objArrayHandle dest(THREAD, dest_o); 2076 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2077 dest->obj_at_put(0, str()); 2078 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2079 dest->obj_at_put(1, str()); 2080 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2081 dest->obj_at_put(2, str()); 2082 return (jobjectArray) JNIHandles::make_local(dest()); 2083 } 2084 JVM_END 2085 2086 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2087 { 2088 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2089 JvmtiVMObjectAllocEventCollector oam; 2090 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2091 bounds_check(cp, index, CHECK_0); 2092 constantTag tag = cp->tag_at(index); 2093 if (!tag.is_field_or_method()) { 2094 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2095 } 2096 return (jint) cp->uncached_klass_ref_index_at(index); 2097 } 2098 JVM_END 2099 2100 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2101 { 2102 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2103 JvmtiVMObjectAllocEventCollector oam; 2104 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2105 bounds_check(cp, index, CHECK_0); 2106 constantTag tag = cp->tag_at(index); 2107 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2108 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2109 } 2110 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2111 } 2112 JVM_END 2113 2114 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2115 { 2116 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2117 JvmtiVMObjectAllocEventCollector oam; 2118 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2119 bounds_check(cp, index, CHECK_NULL); 2120 constantTag tag = cp->tag_at(index); 2121 if (!tag.is_name_and_type()) { 2122 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2123 } 2124 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2125 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2126 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2127 objArrayHandle dest(THREAD, dest_o); 2128 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2129 dest->obj_at_put(0, str()); 2130 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2131 dest->obj_at_put(1, str()); 2132 return (jobjectArray) JNIHandles::make_local(dest()); 2133 } 2134 JVM_END 2135 2136 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2137 { 2138 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2139 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2140 bounds_check(cp, index, CHECK_0); 2141 constantTag tag = cp->tag_at(index); 2142 if (!tag.is_int()) { 2143 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2144 } 2145 return cp->int_at(index); 2146 } 2147 JVM_END 2148 2149 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2150 { 2151 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2152 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2153 bounds_check(cp, index, CHECK_(0L)); 2154 constantTag tag = cp->tag_at(index); 2155 if (!tag.is_long()) { 2156 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2157 } 2158 return cp->long_at(index); 2159 } 2160 JVM_END 2161 2162 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2163 { 2164 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2165 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2166 bounds_check(cp, index, CHECK_(0.0f)); 2167 constantTag tag = cp->tag_at(index); 2168 if (!tag.is_float()) { 2169 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2170 } 2171 return cp->float_at(index); 2172 } 2173 JVM_END 2174 2175 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2176 { 2177 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2178 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2179 bounds_check(cp, index, CHECK_(0.0)); 2180 constantTag tag = cp->tag_at(index); 2181 if (!tag.is_double()) { 2182 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2183 } 2184 return cp->double_at(index); 2185 } 2186 JVM_END 2187 2188 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2189 { 2190 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2191 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2192 bounds_check(cp, index, CHECK_NULL); 2193 constantTag tag = cp->tag_at(index); 2194 if (!tag.is_string()) { 2195 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2196 } 2197 oop str = cp->string_at(index, CHECK_NULL); 2198 return (jstring) JNIHandles::make_local(str); 2199 } 2200 JVM_END 2201 2202 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2203 { 2204 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2205 JvmtiVMObjectAllocEventCollector oam; 2206 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2207 bounds_check(cp, index, CHECK_NULL); 2208 constantTag tag = cp->tag_at(index); 2209 if (!tag.is_symbol()) { 2210 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2211 } 2212 Symbol* sym = cp->symbol_at(index); 2213 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2214 return (jstring) JNIHandles::make_local(str()); 2215 } 2216 JVM_END 2217 2218 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2219 { 2220 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2221 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2222 bounds_check(cp, index, CHECK_0); 2223 constantTag tag = cp->tag_at(index); 2224 jbyte result = tag.value(); 2225 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2226 // they are changed to the corresponding tags from the JVM spec, so that java code in 2227 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2228 if (tag.is_klass_or_reference()) { 2229 result = JVM_CONSTANT_Class; 2230 } else if (tag.is_string_index()) { 2231 result = JVM_CONSTANT_String; 2232 } else if (tag.is_method_type_in_error()) { 2233 result = JVM_CONSTANT_MethodType; 2234 } else if (tag.is_method_handle_in_error()) { 2235 result = JVM_CONSTANT_MethodHandle; 2236 } 2237 return result; 2238 } 2239 JVM_END 2240 2241 // Assertion support. ////////////////////////////////////////////////////////// 2242 2243 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2244 JVMWrapper("JVM_DesiredAssertionStatus"); 2245 assert(cls != NULL, "bad class"); 2246 2247 oop r = JNIHandles::resolve(cls); 2248 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2249 if (java_lang_Class::is_primitive(r)) return false; 2250 2251 Klass* k = java_lang_Class::as_Klass(r); 2252 assert(k->is_instance_klass(), "must be an instance klass"); 2253 if (!k->is_instance_klass()) return false; 2254 2255 ResourceMark rm(THREAD); 2256 const char* name = k->name()->as_C_string(); 2257 bool system_class = k->class_loader() == NULL; 2258 return JavaAssertions::enabled(name, system_class); 2259 2260 JVM_END 2261 2262 2263 // Return a new AssertionStatusDirectives object with the fields filled in with 2264 // command-line assertion arguments (i.e., -ea, -da). 2265 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2266 JVMWrapper("JVM_AssertionStatusDirectives"); 2267 JvmtiVMObjectAllocEventCollector oam; 2268 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2269 return JNIHandles::make_local(env, asd); 2270 JVM_END 2271 2272 // Verification //////////////////////////////////////////////////////////////////////////////// 2273 2274 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2275 2276 // RedefineClasses support: bug 6214132 caused verification to fail. 2277 // All functions from this section should call the jvmtiThreadSate function: 2278 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2279 // The function returns a Klass* of the _scratch_class if the verifier 2280 // was invoked in the middle of the class redefinition. 2281 // Otherwise it returns its argument value which is the _the_class Klass*. 2282 // Please, refer to the description in the jvmtiThreadSate.hpp. 2283 2284 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2285 JVMWrapper("JVM_GetClassNameUTF"); 2286 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2287 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2288 return k->name()->as_utf8(); 2289 JVM_END 2290 2291 2292 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2293 JVMWrapper("JVM_GetClassCPTypes"); 2294 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2295 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2296 // types will have length zero if this is not an InstanceKlass 2297 // (length is determined by call to JVM_GetClassCPEntriesCount) 2298 if (k->is_instance_klass()) { 2299 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2300 for (int index = cp->length() - 1; index >= 0; index--) { 2301 constantTag tag = cp->tag_at(index); 2302 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2303 } 2304 } 2305 JVM_END 2306 2307 2308 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2309 JVMWrapper("JVM_GetClassCPEntriesCount"); 2310 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2311 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2312 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2313 JVM_END 2314 2315 2316 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2317 JVMWrapper("JVM_GetClassFieldsCount"); 2318 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2319 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2320 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2321 JVM_END 2322 2323 2324 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2325 JVMWrapper("JVM_GetClassMethodsCount"); 2326 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2327 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2328 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2329 JVM_END 2330 2331 2332 // The following methods, used for the verifier, are never called with 2333 // array klasses, so a direct cast to InstanceKlass is safe. 2334 // Typically, these methods are called in a loop with bounds determined 2335 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2336 // zero for arrays. 2337 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2338 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2339 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2340 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2341 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2342 int length = method->checked_exceptions_length(); 2343 if (length > 0) { 2344 CheckedExceptionElement* table= method->checked_exceptions_start(); 2345 for (int i = 0; i < length; i++) { 2346 exceptions[i] = table[i].class_cp_index; 2347 } 2348 } 2349 JVM_END 2350 2351 2352 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2353 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2354 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2355 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2356 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2357 return method->checked_exceptions_length(); 2358 JVM_END 2359 2360 2361 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2362 JVMWrapper("JVM_GetMethodIxByteCode"); 2363 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2364 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2365 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2366 memcpy(code, method->code_base(), method->code_size()); 2367 JVM_END 2368 2369 2370 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2371 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2372 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2373 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2374 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2375 return method->code_size(); 2376 JVM_END 2377 2378 2379 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2380 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2381 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2382 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2383 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2384 ExceptionTable extable(method); 2385 entry->start_pc = extable.start_pc(entry_index); 2386 entry->end_pc = extable.end_pc(entry_index); 2387 entry->handler_pc = extable.handler_pc(entry_index); 2388 entry->catchType = extable.catch_type_index(entry_index); 2389 JVM_END 2390 2391 2392 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2393 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2394 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2395 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2396 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2397 return method->exception_table_length(); 2398 JVM_END 2399 2400 2401 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2402 JVMWrapper("JVM_GetMethodIxModifiers"); 2403 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2404 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2405 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2406 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2407 JVM_END 2408 2409 2410 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2411 JVMWrapper("JVM_GetFieldIxModifiers"); 2412 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2413 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2414 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2415 JVM_END 2416 2417 2418 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2419 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2420 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2421 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2422 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2423 return method->max_locals(); 2424 JVM_END 2425 2426 2427 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2428 JVMWrapper("JVM_GetMethodIxArgsSize"); 2429 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2430 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2431 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2432 return method->size_of_parameters(); 2433 JVM_END 2434 2435 2436 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2437 JVMWrapper("JVM_GetMethodIxMaxStack"); 2438 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2439 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2440 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2441 return method->verifier_max_stack(); 2442 JVM_END 2443 2444 2445 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2446 JVMWrapper("JVM_IsConstructorIx"); 2447 ResourceMark rm(THREAD); 2448 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2449 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2450 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2451 return method->name() == vmSymbols::object_initializer_name(); 2452 JVM_END 2453 2454 2455 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2456 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2457 ResourceMark rm(THREAD); 2458 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2459 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2460 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2461 return method->is_overpass(); 2462 JVM_END 2463 2464 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2465 JVMWrapper("JVM_GetMethodIxIxUTF"); 2466 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2467 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2468 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2469 return method->name()->as_utf8(); 2470 JVM_END 2471 2472 2473 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2474 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2475 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2476 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2477 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2478 return method->signature()->as_utf8(); 2479 JVM_END 2480 2481 /** 2482 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2483 * read entries in the constant pool. Since the old verifier always 2484 * works on a copy of the code, it will not see any rewriting that 2485 * may possibly occur in the middle of verification. So it is important 2486 * that nothing it calls tries to use the cpCache instead of the raw 2487 * constant pool, so we must use cp->uncached_x methods when appropriate. 2488 */ 2489 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2490 JVMWrapper("JVM_GetCPFieldNameUTF"); 2491 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2492 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2493 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2494 switch (cp->tag_at(cp_index).value()) { 2495 case JVM_CONSTANT_Fieldref: 2496 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2497 default: 2498 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2499 } 2500 ShouldNotReachHere(); 2501 return NULL; 2502 JVM_END 2503 2504 2505 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2506 JVMWrapper("JVM_GetCPMethodNameUTF"); 2507 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2508 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2509 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2510 switch (cp->tag_at(cp_index).value()) { 2511 case JVM_CONSTANT_InterfaceMethodref: 2512 case JVM_CONSTANT_Methodref: 2513 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2514 default: 2515 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2516 } 2517 ShouldNotReachHere(); 2518 return NULL; 2519 JVM_END 2520 2521 2522 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2523 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2524 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2525 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2526 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2527 switch (cp->tag_at(cp_index).value()) { 2528 case JVM_CONSTANT_InterfaceMethodref: 2529 case JVM_CONSTANT_Methodref: 2530 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2531 default: 2532 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2533 } 2534 ShouldNotReachHere(); 2535 return NULL; 2536 JVM_END 2537 2538 2539 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2540 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2541 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2542 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2543 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2544 switch (cp->tag_at(cp_index).value()) { 2545 case JVM_CONSTANT_Fieldref: 2546 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2547 default: 2548 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2549 } 2550 ShouldNotReachHere(); 2551 return NULL; 2552 JVM_END 2553 2554 2555 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2556 JVMWrapper("JVM_GetCPClassNameUTF"); 2557 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2558 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2559 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2560 Symbol* classname = cp->klass_name_at(cp_index); 2561 return classname->as_utf8(); 2562 JVM_END 2563 2564 2565 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2566 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2567 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2568 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2569 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2570 switch (cp->tag_at(cp_index).value()) { 2571 case JVM_CONSTANT_Fieldref: { 2572 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2573 Symbol* classname = cp->klass_name_at(class_index); 2574 return classname->as_utf8(); 2575 } 2576 default: 2577 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2578 } 2579 ShouldNotReachHere(); 2580 return NULL; 2581 JVM_END 2582 2583 2584 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2585 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2586 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2587 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2588 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2589 switch (cp->tag_at(cp_index).value()) { 2590 case JVM_CONSTANT_Methodref: 2591 case JVM_CONSTANT_InterfaceMethodref: { 2592 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2593 Symbol* classname = cp->klass_name_at(class_index); 2594 return classname->as_utf8(); 2595 } 2596 default: 2597 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2598 } 2599 ShouldNotReachHere(); 2600 return NULL; 2601 JVM_END 2602 2603 2604 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2605 JVMWrapper("JVM_GetCPFieldModifiers"); 2606 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2607 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2608 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2609 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2610 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2611 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2612 switch (cp->tag_at(cp_index).value()) { 2613 case JVM_CONSTANT_Fieldref: { 2614 Symbol* name = cp->uncached_name_ref_at(cp_index); 2615 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2616 InstanceKlass* ik = InstanceKlass::cast(k_called); 2617 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2618 if (fs.name() == name && fs.signature() == signature) { 2619 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2620 } 2621 } 2622 return -1; 2623 } 2624 default: 2625 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2626 } 2627 ShouldNotReachHere(); 2628 return 0; 2629 JVM_END 2630 2631 2632 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2633 JVMWrapper("JVM_GetCPMethodModifiers"); 2634 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2635 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2636 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2637 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2638 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2639 switch (cp->tag_at(cp_index).value()) { 2640 case JVM_CONSTANT_Methodref: 2641 case JVM_CONSTANT_InterfaceMethodref: { 2642 Symbol* name = cp->uncached_name_ref_at(cp_index); 2643 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2644 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2645 int methods_count = methods->length(); 2646 for (int i = 0; i < methods_count; i++) { 2647 Method* method = methods->at(i); 2648 if (method->name() == name && method->signature() == signature) { 2649 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2650 } 2651 } 2652 return -1; 2653 } 2654 default: 2655 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2656 } 2657 ShouldNotReachHere(); 2658 return 0; 2659 JVM_END 2660 2661 2662 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2663 2664 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2665 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2666 JVM_END 2667 2668 2669 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2670 JVMWrapper("JVM_IsSameClassPackage"); 2671 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2672 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2673 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2674 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2675 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2676 JVM_END 2677 2678 // Printing support ////////////////////////////////////////////////// 2679 extern "C" { 2680 2681 ATTRIBUTE_PRINTF(3, 0) 2682 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2683 // see bug 4399518, 4417214 2684 if ((intptr_t)count <= 0) return -1; 2685 2686 int result = vsnprintf(str, count, fmt, args); 2687 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2688 // characters which would have been written had the buffer been large 2689 // enough; on Windows, it returns -1. We handle both cases here and 2690 // always return -1, and perform null termination. 2691 if ((result > 0 && (size_t)result >= count) || result == -1) { 2692 str[count - 1] = '\0'; 2693 result = -1; 2694 } 2695 2696 return result; 2697 } 2698 2699 ATTRIBUTE_PRINTF(3, 0) 2700 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2701 va_list args; 2702 int len; 2703 va_start(args, fmt); 2704 len = jio_vsnprintf(str, count, fmt, args); 2705 va_end(args); 2706 return len; 2707 } 2708 2709 ATTRIBUTE_PRINTF(2,3) 2710 int jio_fprintf(FILE* f, const char *fmt, ...) { 2711 int len; 2712 va_list args; 2713 va_start(args, fmt); 2714 len = jio_vfprintf(f, fmt, args); 2715 va_end(args); 2716 return len; 2717 } 2718 2719 ATTRIBUTE_PRINTF(2, 0) 2720 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2721 if (Arguments::vfprintf_hook() != NULL) { 2722 return Arguments::vfprintf_hook()(f, fmt, args); 2723 } else { 2724 return vfprintf(f, fmt, args); 2725 } 2726 } 2727 2728 ATTRIBUTE_PRINTF(1, 2) 2729 JNIEXPORT int jio_printf(const char *fmt, ...) { 2730 int len; 2731 va_list args; 2732 va_start(args, fmt); 2733 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2734 va_end(args); 2735 return len; 2736 } 2737 2738 2739 // HotSpot specific jio method 2740 void jio_print(const char* s) { 2741 // Try to make this function as atomic as possible. 2742 if (Arguments::vfprintf_hook() != NULL) { 2743 jio_fprintf(defaultStream::output_stream(), "%s", s); 2744 } else { 2745 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2746 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2747 } 2748 } 2749 2750 } // Extern C 2751 2752 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2753 2754 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 2755 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or 2756 // OSThread objects. The exception to this rule is when the target object is the thread 2757 // doing the operation, in which case we know that the thread won't exit until the 2758 // operation is done (all exits being voluntary). There are a few cases where it is 2759 // rather silly to do operations on yourself, like resuming yourself or asking whether 2760 // you are alive. While these can still happen, they are not subject to deadlocks if 2761 // the lock is held while the operation occurs (this is not the case for suspend, for 2762 // instance), and are very unlikely. Because IsAlive needs to be fast and its 2763 // implementation is local to this file, we always lock Threads_lock for that one. 2764 2765 static void thread_entry(JavaThread* thread, TRAPS) { 2766 HandleMark hm(THREAD); 2767 Handle obj(THREAD, thread->threadObj()); 2768 JavaValue result(T_VOID); 2769 JavaCalls::call_virtual(&result, 2770 obj, 2771 SystemDictionary::Thread_klass(), 2772 vmSymbols::run_method_name(), 2773 vmSymbols::void_method_signature(), 2774 THREAD); 2775 } 2776 2777 2778 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2779 JVMWrapper("JVM_StartThread"); 2780 JavaThread *native_thread = NULL; 2781 2782 // We cannot hold the Threads_lock when we throw an exception, 2783 // due to rank ordering issues. Example: we might need to grab the 2784 // Heap_lock while we construct the exception. 2785 bool throw_illegal_thread_state = false; 2786 2787 // We must release the Threads_lock before we can post a jvmti event 2788 // in Thread::start. 2789 { 2790 // Ensure that the C++ Thread and OSThread structures aren't freed before 2791 // we operate. 2792 MutexLocker mu(Threads_lock); 2793 2794 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2795 // re-starting an already started thread, so we should usually find 2796 // that the JavaThread is null. However for a JNI attached thread 2797 // there is a small window between the Thread object being created 2798 // (with its JavaThread set) and the update to its threadStatus, so we 2799 // have to check for this 2800 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2801 throw_illegal_thread_state = true; 2802 } else { 2803 // We could also check the stillborn flag to see if this thread was already stopped, but 2804 // for historical reasons we let the thread detect that itself when it starts running 2805 2806 jlong size = 2807 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2808 // Allocate the C++ Thread structure and create the native thread. The 2809 // stack size retrieved from java is 64-bit signed, but the constructor takes 2810 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2811 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2812 // - Avoid passing negative values which would result in really large stacks. 2813 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2814 size_t sz = size > 0 ? (size_t) size : 0; 2815 native_thread = new JavaThread(&thread_entry, sz); 2816 2817 // At this point it may be possible that no osthread was created for the 2818 // JavaThread due to lack of memory. Check for this situation and throw 2819 // an exception if necessary. Eventually we may want to change this so 2820 // that we only grab the lock if the thread was created successfully - 2821 // then we can also do this check and throw the exception in the 2822 // JavaThread constructor. 2823 if (native_thread->osthread() != NULL) { 2824 // Note: the current thread is not being used within "prepare". 2825 native_thread->prepare(jthread); 2826 } 2827 } 2828 } 2829 2830 if (throw_illegal_thread_state) { 2831 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2832 } 2833 2834 assert(native_thread != NULL, "Starting null thread?"); 2835 2836 if (native_thread->osthread() == NULL) { 2837 // No one should hold a reference to the 'native_thread'. 2838 delete native_thread; 2839 if (JvmtiExport::should_post_resource_exhausted()) { 2840 JvmtiExport::post_resource_exhausted( 2841 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2842 os::native_thread_creation_failed_msg()); 2843 } 2844 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2845 os::native_thread_creation_failed_msg()); 2846 } 2847 2848 Thread::start(native_thread); 2849 2850 JVM_END 2851 2852 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2853 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2854 // but is thought to be reliable and simple. In the case, where the receiver is the 2855 // same thread as the sender, no safepoint is needed. 2856 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2857 JVMWrapper("JVM_StopThread"); 2858 2859 oop java_throwable = JNIHandles::resolve(throwable); 2860 if (java_throwable == NULL) { 2861 THROW(vmSymbols::java_lang_NullPointerException()); 2862 } 2863 oop java_thread = JNIHandles::resolve_non_null(jthread); 2864 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2865 Events::log_exception(JavaThread::current(), 2866 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2867 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2868 // First check if thread is alive 2869 if (receiver != NULL) { 2870 // Check if exception is getting thrown at self (use oop equality, since the 2871 // target object might exit) 2872 if (java_thread == thread->threadObj()) { 2873 THROW_OOP(java_throwable); 2874 } else { 2875 // Enques a VM_Operation to stop all threads and then deliver the exception... 2876 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 2877 } 2878 } 2879 else { 2880 // Either: 2881 // - target thread has not been started before being stopped, or 2882 // - target thread already terminated 2883 // We could read the threadStatus to determine which case it is 2884 // but that is overkill as it doesn't matter. We must set the 2885 // stillborn flag for the first case, and if the thread has already 2886 // exited setting this flag has no affect 2887 java_lang_Thread::set_stillborn(java_thread); 2888 } 2889 JVM_END 2890 2891 2892 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2893 JVMWrapper("JVM_IsThreadAlive"); 2894 2895 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2896 return java_lang_Thread::is_alive(thread_oop); 2897 JVM_END 2898 2899 2900 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2901 JVMWrapper("JVM_SuspendThread"); 2902 oop java_thread = JNIHandles::resolve_non_null(jthread); 2903 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2904 2905 if (receiver != NULL) { 2906 // thread has run and has not exited (still on threads list) 2907 2908 { 2909 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2910 if (receiver->is_external_suspend()) { 2911 // Don't allow nested external suspend requests. We can't return 2912 // an error from this interface so just ignore the problem. 2913 return; 2914 } 2915 if (receiver->is_exiting()) { // thread is in the process of exiting 2916 return; 2917 } 2918 receiver->set_external_suspend(); 2919 } 2920 2921 // java_suspend() will catch threads in the process of exiting 2922 // and will ignore them. 2923 receiver->java_suspend(); 2924 2925 // It would be nice to have the following assertion in all the 2926 // time, but it is possible for a racing resume request to have 2927 // resumed this thread right after we suspended it. Temporarily 2928 // enable this assertion if you are chasing a different kind of 2929 // bug. 2930 // 2931 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2932 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2933 } 2934 JVM_END 2935 2936 2937 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2938 JVMWrapper("JVM_ResumeThread"); 2939 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 2940 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2941 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2942 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2943 // looks at it. 2944 MutexLocker ml(Threads_lock); 2945 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2946 if (thr != NULL) { 2947 // the thread has run and is not in the process of exiting 2948 thr->java_resume(); 2949 } 2950 JVM_END 2951 2952 2953 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2954 JVMWrapper("JVM_SetThreadPriority"); 2955 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2956 MutexLocker ml(Threads_lock); 2957 oop java_thread = JNIHandles::resolve_non_null(jthread); 2958 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2959 JavaThread* thr = java_lang_Thread::thread(java_thread); 2960 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 2961 Thread::set_priority(thr, (ThreadPriority)prio); 2962 } 2963 JVM_END 2964 2965 2966 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2967 JVMWrapper("JVM_Yield"); 2968 if (os::dont_yield()) return; 2969 HOTSPOT_THREAD_YIELD(); 2970 os::naked_yield(); 2971 JVM_END 2972 2973 2974 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2975 JVMWrapper("JVM_Sleep"); 2976 2977 if (millis < 0) { 2978 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2979 } 2980 2981 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2982 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2983 } 2984 2985 // Save current thread state and restore it at the end of this block. 2986 // And set new thread state to SLEEPING. 2987 JavaThreadSleepState jtss(thread); 2988 2989 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 2990 2991 EventThreadSleep event; 2992 2993 if (millis == 0) { 2994 os::naked_yield(); 2995 } else { 2996 ThreadState old_state = thread->osthread()->get_state(); 2997 thread->osthread()->set_state(SLEEPING); 2998 if (os::sleep(thread, millis, true) == OS_INTRPT) { 2999 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3000 // us while we were sleeping. We do not overwrite those. 3001 if (!HAS_PENDING_EXCEPTION) { 3002 if (event.should_commit()) { 3003 event.set_time(millis); 3004 event.commit(); 3005 } 3006 HOTSPOT_THREAD_SLEEP_END(1); 3007 3008 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3009 // to properly restore the thread state. That's likely wrong. 3010 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3011 } 3012 } 3013 thread->osthread()->set_state(old_state); 3014 } 3015 if (event.should_commit()) { 3016 event.set_time(millis); 3017 event.commit(); 3018 } 3019 HOTSPOT_THREAD_SLEEP_END(0); 3020 JVM_END 3021 3022 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3023 JVMWrapper("JVM_CurrentThread"); 3024 oop jthread = thread->threadObj(); 3025 assert (thread != NULL, "no current thread!"); 3026 return JNIHandles::make_local(env, jthread); 3027 JVM_END 3028 3029 3030 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3031 JVMWrapper("JVM_CountStackFrames"); 3032 3033 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3034 oop java_thread = JNIHandles::resolve_non_null(jthread); 3035 bool throw_illegal_thread_state = false; 3036 int count = 0; 3037 3038 { 3039 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3040 // We need to re-resolve the java_thread, since a GC might have happened during the 3041 // acquire of the lock 3042 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3043 3044 if (thr == NULL) { 3045 // do nothing 3046 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 3047 // Check whether this java thread has been suspended already. If not, throws 3048 // IllegalThreadStateException. We defer to throw that exception until 3049 // Threads_lock is released since loading exception class has to leave VM. 3050 // The correct way to test a thread is actually suspended is 3051 // wait_for_ext_suspend_completion(), but we can't call that while holding 3052 // the Threads_lock. The above tests are sufficient for our purposes 3053 // provided the walkability of the stack is stable - which it isn't 3054 // 100% but close enough for most practical purposes. 3055 throw_illegal_thread_state = true; 3056 } else { 3057 // Count all java activation, i.e., number of vframes 3058 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 3059 // Native frames are not counted 3060 if (!vfst.method()->is_native()) count++; 3061 } 3062 } 3063 } 3064 3065 if (throw_illegal_thread_state) { 3066 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3067 "this thread is not suspended"); 3068 } 3069 return count; 3070 JVM_END 3071 3072 // Consider: A better way to implement JVM_Interrupt() is to acquire 3073 // Threads_lock to resolve the jthread into a Thread pointer, fetch 3074 // Thread->platformevent, Thread->native_thr, Thread->parker, etc., 3075 // drop Threads_lock, and the perform the unpark() and thr_kill() operations 3076 // outside the critical section. Threads_lock is hot so we want to minimize 3077 // the hold-time. A cleaner interface would be to decompose interrupt into 3078 // two steps. The 1st phase, performed under Threads_lock, would return 3079 // a closure that'd be invoked after Threads_lock was dropped. 3080 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 3081 // admit spurious wakeups. 3082 3083 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3084 JVMWrapper("JVM_Interrupt"); 3085 3086 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3087 oop java_thread = JNIHandles::resolve_non_null(jthread); 3088 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3089 // We need to re-resolve the java_thread, since a GC might have happened during the 3090 // acquire of the lock 3091 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3092 if (thr != NULL) { 3093 Thread::interrupt(thr); 3094 } 3095 JVM_END 3096 3097 3098 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3099 JVMWrapper("JVM_IsInterrupted"); 3100 3101 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3102 oop java_thread = JNIHandles::resolve_non_null(jthread); 3103 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3104 // We need to re-resolve the java_thread, since a GC might have happened during the 3105 // acquire of the lock 3106 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3107 if (thr == NULL) { 3108 return JNI_FALSE; 3109 } else { 3110 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3111 } 3112 JVM_END 3113 3114 3115 // Return true iff the current thread has locked the object passed in 3116 3117 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3118 JVMWrapper("JVM_HoldsLock"); 3119 assert(THREAD->is_Java_thread(), "sanity check"); 3120 if (obj == NULL) { 3121 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3122 } 3123 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3124 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3125 JVM_END 3126 3127 3128 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3129 JVMWrapper("JVM_DumpAllStacks"); 3130 VM_PrintThreads op; 3131 VMThread::execute(&op); 3132 if (JvmtiExport::should_post_data_dump()) { 3133 JvmtiExport::post_data_dump(); 3134 } 3135 JVM_END 3136 3137 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3138 JVMWrapper("JVM_SetNativeThreadName"); 3139 ResourceMark rm(THREAD); 3140 oop java_thread = JNIHandles::resolve_non_null(jthread); 3141 JavaThread* thr = java_lang_Thread::thread(java_thread); 3142 // Thread naming only supported for the current thread, doesn't work for 3143 // target threads. 3144 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3145 // we don't set the name of an attached thread to avoid stepping 3146 // on other programs 3147 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3148 os::set_native_thread_name(thread_name); 3149 } 3150 JVM_END 3151 3152 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3153 3154 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3155 assert(jthread->is_Java_thread(), "must be a Java thread"); 3156 if (jthread->privileged_stack_top() == NULL) return false; 3157 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3158 oop loader = jthread->privileged_stack_top()->class_loader(); 3159 if (loader == NULL) return true; 3160 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3161 if (trusted) return true; 3162 } 3163 return false; 3164 } 3165 3166 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3167 JVMWrapper("JVM_CurrentLoadedClass"); 3168 ResourceMark rm(THREAD); 3169 3170 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3171 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3172 bool trusted = is_trusted_frame(thread, &vfst); 3173 if (trusted) return NULL; 3174 3175 Method* m = vfst.method(); 3176 if (!m->is_native()) { 3177 InstanceKlass* holder = m->method_holder(); 3178 oop loader = holder->class_loader(); 3179 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3180 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3181 } 3182 } 3183 } 3184 return NULL; 3185 JVM_END 3186 3187 3188 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3189 JVMWrapper("JVM_CurrentClassLoader"); 3190 ResourceMark rm(THREAD); 3191 3192 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3193 3194 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3195 bool trusted = is_trusted_frame(thread, &vfst); 3196 if (trusted) return NULL; 3197 3198 Method* m = vfst.method(); 3199 if (!m->is_native()) { 3200 InstanceKlass* holder = m->method_holder(); 3201 assert(holder->is_klass(), "just checking"); 3202 oop loader = holder->class_loader(); 3203 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3204 return JNIHandles::make_local(env, loader); 3205 } 3206 } 3207 } 3208 return NULL; 3209 JVM_END 3210 3211 3212 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3213 JVMWrapper("JVM_GetClassContext"); 3214 ResourceMark rm(THREAD); 3215 JvmtiVMObjectAllocEventCollector oam; 3216 vframeStream vfst(thread); 3217 3218 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3219 // This must only be called from SecurityManager.getClassContext 3220 Method* m = vfst.method(); 3221 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3222 m->name() == vmSymbols::getClassContext_name() && 3223 m->signature() == vmSymbols::void_class_array_signature())) { 3224 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3225 } 3226 } 3227 3228 // Collect method holders 3229 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3230 for (; !vfst.at_end(); vfst.security_next()) { 3231 Method* m = vfst.method(); 3232 // Native frames are not returned 3233 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3234 Klass* holder = m->method_holder(); 3235 assert(holder->is_klass(), "just checking"); 3236 klass_array->append(holder); 3237 } 3238 } 3239 3240 // Create result array of type [Ljava/lang/Class; 3241 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3242 // Fill in mirrors corresponding to method holders 3243 for (int i = 0; i < klass_array->length(); i++) { 3244 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3245 } 3246 3247 return (jobjectArray) JNIHandles::make_local(env, result); 3248 JVM_END 3249 3250 3251 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3252 JVMWrapper("JVM_ClassDepth"); 3253 ResourceMark rm(THREAD); 3254 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3255 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3256 3257 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3258 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3259 if (class_name_sym == NULL) { 3260 return -1; 3261 } 3262 3263 int depth = 0; 3264 3265 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3266 if (!vfst.method()->is_native()) { 3267 InstanceKlass* holder = vfst.method()->method_holder(); 3268 assert(holder->is_klass(), "just checking"); 3269 if (holder->name() == class_name_sym) { 3270 return depth; 3271 } 3272 depth++; 3273 } 3274 } 3275 return -1; 3276 JVM_END 3277 3278 3279 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3280 JVMWrapper("JVM_ClassLoaderDepth"); 3281 ResourceMark rm(THREAD); 3282 int depth = 0; 3283 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3284 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3285 bool trusted = is_trusted_frame(thread, &vfst); 3286 if (trusted) return -1; 3287 3288 Method* m = vfst.method(); 3289 if (!m->is_native()) { 3290 InstanceKlass* holder = m->method_holder(); 3291 assert(holder->is_klass(), "just checking"); 3292 oop loader = holder->class_loader(); 3293 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3294 return depth; 3295 } 3296 depth++; 3297 } 3298 } 3299 return -1; 3300 JVM_END 3301 3302 3303 // java.lang.Package //////////////////////////////////////////////////////////////// 3304 3305 3306 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3307 JVMWrapper("JVM_GetSystemPackage"); 3308 ResourceMark rm(THREAD); 3309 JvmtiVMObjectAllocEventCollector oam; 3310 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3311 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3312 return (jstring) JNIHandles::make_local(result); 3313 JVM_END 3314 3315 3316 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3317 JVMWrapper("JVM_GetSystemPackages"); 3318 JvmtiVMObjectAllocEventCollector oam; 3319 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3320 return (jobjectArray) JNIHandles::make_local(result); 3321 JVM_END 3322 3323 3324 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3325 3326 3327 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3328 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3329 3330 MonitorLockerEx ml(Heap_lock); 3331 oop ref = Universe::reference_pending_list(); 3332 if (ref != NULL) { 3333 Universe::set_reference_pending_list(NULL); 3334 } 3335 return JNIHandles::make_local(env, ref); 3336 JVM_END 3337 3338 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3339 JVMWrapper("JVM_HasReferencePendingList"); 3340 MonitorLockerEx ml(Heap_lock); 3341 return Universe::has_reference_pending_list(); 3342 JVM_END 3343 3344 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3345 JVMWrapper("JVM_WaitForReferencePendingList"); 3346 MonitorLockerEx ml(Heap_lock); 3347 while (!Universe::has_reference_pending_list()) { 3348 ml.wait(); 3349 } 3350 JVM_END 3351 3352 3353 // ObjectInputStream /////////////////////////////////////////////////////////////// 3354 3355 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3356 if (current_class == NULL) { 3357 return true; 3358 } 3359 if ((current_class == field_class) || access.is_public()) { 3360 return true; 3361 } 3362 3363 if (access.is_protected()) { 3364 // See if current_class is a subclass of field_class 3365 if (current_class->is_subclass_of(field_class)) { 3366 return true; 3367 } 3368 } 3369 3370 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3371 } 3372 3373 // Return the first user-defined class loader up the execution stack, or null 3374 // if only code from the bootstrap or platform class loader is on the stack. 3375 3376 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3377 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3378 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3379 oop loader = vfst.method()->method_holder()->class_loader(); 3380 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3381 return JNIHandles::make_local(env, loader); 3382 } 3383 } 3384 return NULL; 3385 JVM_END 3386 3387 3388 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3389 3390 3391 // resolve array handle and check arguments 3392 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3393 if (arr == NULL) { 3394 THROW_0(vmSymbols::java_lang_NullPointerException()); 3395 } 3396 oop a = JNIHandles::resolve_non_null(arr); 3397 if (!a->is_array()) { 3398 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3399 } else if (type_array_only && !a->is_typeArray()) { 3400 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3401 } 3402 return arrayOop(a); 3403 } 3404 3405 3406 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3407 JVMWrapper("JVM_GetArrayLength"); 3408 arrayOop a = check_array(env, arr, false, CHECK_0); 3409 return a->length(); 3410 JVM_END 3411 3412 3413 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3414 JVMWrapper("JVM_Array_Get"); 3415 JvmtiVMObjectAllocEventCollector oam; 3416 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3417 jvalue value; 3418 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3419 oop box = Reflection::box(&value, type, CHECK_NULL); 3420 return JNIHandles::make_local(env, box); 3421 JVM_END 3422 3423 3424 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3425 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3426 jvalue value; 3427 value.i = 0; // to initialize value before getting used in CHECK 3428 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3429 assert(a->is_typeArray(), "just checking"); 3430 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3431 BasicType wide_type = (BasicType) wCode; 3432 if (type != wide_type) { 3433 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3434 } 3435 return value; 3436 JVM_END 3437 3438 3439 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3440 JVMWrapper("JVM_SetArrayElement"); 3441 arrayOop a = check_array(env, arr, false, CHECK); 3442 oop box = JNIHandles::resolve(val); 3443 jvalue value; 3444 value.i = 0; // to initialize value before getting used in CHECK 3445 BasicType value_type; 3446 if (a->is_objArray()) { 3447 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3448 value_type = Reflection::unbox_for_regular_object(box, &value); 3449 } else { 3450 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3451 } 3452 Reflection::array_set(&value, a, index, value_type, CHECK); 3453 JVM_END 3454 3455 3456 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3457 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3458 arrayOop a = check_array(env, arr, true, CHECK); 3459 assert(a->is_typeArray(), "just checking"); 3460 BasicType value_type = (BasicType) vCode; 3461 Reflection::array_set(&v, a, index, value_type, CHECK); 3462 JVM_END 3463 3464 3465 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3466 JVMWrapper("JVM_NewArray"); 3467 JvmtiVMObjectAllocEventCollector oam; 3468 oop element_mirror = JNIHandles::resolve(eltClass); 3469 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3470 return JNIHandles::make_local(env, result); 3471 JVM_END 3472 3473 3474 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3475 JVMWrapper("JVM_NewMultiArray"); 3476 JvmtiVMObjectAllocEventCollector oam; 3477 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3478 oop element_mirror = JNIHandles::resolve(eltClass); 3479 assert(dim_array->is_typeArray(), "just checking"); 3480 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3481 return JNIHandles::make_local(env, result); 3482 JVM_END 3483 3484 3485 // Library support /////////////////////////////////////////////////////////////////////////// 3486 3487 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3488 //%note jvm_ct 3489 JVMWrapper("JVM_LoadLibrary"); 3490 char ebuf[1024]; 3491 void *load_result; 3492 { 3493 ThreadToNativeFromVM ttnfvm(thread); 3494 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3495 } 3496 if (load_result == NULL) { 3497 char msg[1024]; 3498 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3499 // Since 'ebuf' may contain a string encoded using 3500 // platform encoding scheme, we need to pass 3501 // Exceptions::unsafe_to_utf8 to the new_exception method 3502 // as the last argument. See bug 6367357. 3503 Handle h_exception = 3504 Exceptions::new_exception(thread, 3505 vmSymbols::java_lang_UnsatisfiedLinkError(), 3506 msg, Exceptions::unsafe_to_utf8); 3507 3508 THROW_HANDLE_0(h_exception); 3509 } 3510 return load_result; 3511 JVM_END 3512 3513 3514 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3515 JVMWrapper("JVM_UnloadLibrary"); 3516 os::dll_unload(handle); 3517 JVM_END 3518 3519 3520 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3521 JVMWrapper("JVM_FindLibraryEntry"); 3522 return os::dll_lookup(handle, name); 3523 JVM_END 3524 3525 3526 // JNI version /////////////////////////////////////////////////////////////////////////////// 3527 3528 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3529 JVMWrapper("JVM_IsSupportedJNIVersion"); 3530 return Threads::is_supported_jni_version_including_1_1(version); 3531 JVM_END 3532 3533 3534 // String support /////////////////////////////////////////////////////////////////////////// 3535 3536 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3537 JVMWrapper("JVM_InternString"); 3538 JvmtiVMObjectAllocEventCollector oam; 3539 if (str == NULL) return NULL; 3540 oop string = JNIHandles::resolve_non_null(str); 3541 oop result = StringTable::intern(string, CHECK_NULL); 3542 return (jstring) JNIHandles::make_local(env, result); 3543 JVM_END 3544 3545 3546 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3547 3548 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3549 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3550 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3551 // that only works with java threads. 3552 3553 3554 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3555 VM_Exit::block_if_vm_exited(); 3556 JVMWrapper("JVM_RawMonitorCreate"); 3557 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3558 } 3559 3560 3561 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3562 VM_Exit::block_if_vm_exited(); 3563 JVMWrapper("JVM_RawMonitorDestroy"); 3564 delete ((Mutex*) mon); 3565 } 3566 3567 3568 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3569 VM_Exit::block_if_vm_exited(); 3570 JVMWrapper("JVM_RawMonitorEnter"); 3571 ((Mutex*) mon)->jvm_raw_lock(); 3572 return 0; 3573 } 3574 3575 3576 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3577 VM_Exit::block_if_vm_exited(); 3578 JVMWrapper("JVM_RawMonitorExit"); 3579 ((Mutex*) mon)->jvm_raw_unlock(); 3580 } 3581 3582 3583 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3584 3585 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3586 Handle loader, Handle protection_domain, 3587 jboolean throwError, TRAPS) { 3588 // Security Note: 3589 // The Java level wrapper will perform the necessary security check allowing 3590 // us to pass the NULL as the initiating class loader. The VM is responsible for 3591 // the checkPackageAccess relative to the initiating class loader via the 3592 // protection_domain. The protection_domain is passed as NULL by the java code 3593 // if there is no security manager in 3-arg Class.forName(). 3594 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3595 3596 // Check if we should initialize the class 3597 if (init && klass->is_instance_klass()) { 3598 klass->initialize(CHECK_NULL); 3599 } 3600 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3601 } 3602 3603 3604 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3605 3606 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3607 JVMWrapper("JVM_InvokeMethod"); 3608 Handle method_handle; 3609 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3610 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3611 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3612 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3613 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3614 jobject res = JNIHandles::make_local(env, result); 3615 if (JvmtiExport::should_post_vm_object_alloc()) { 3616 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3617 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3618 if (java_lang_Class::is_primitive(ret_type)) { 3619 // Only for primitive type vm allocates memory for java object. 3620 // See box() method. 3621 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3622 } 3623 } 3624 return res; 3625 } else { 3626 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3627 } 3628 JVM_END 3629 3630 3631 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3632 JVMWrapper("JVM_NewInstanceFromConstructor"); 3633 oop constructor_mirror = JNIHandles::resolve(c); 3634 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3635 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3636 jobject res = JNIHandles::make_local(env, result); 3637 if (JvmtiExport::should_post_vm_object_alloc()) { 3638 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3639 } 3640 return res; 3641 JVM_END 3642 3643 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3644 3645 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3646 JVMWrapper("JVM_SupportsCX8"); 3647 return VM_Version::supports_cx8(); 3648 JVM_END 3649 3650 // Returns an array of all live Thread objects (VM internal JavaThreads, 3651 // jvmti agent threads, and JNI attaching threads are skipped) 3652 // See CR 6404306 regarding JNI attaching threads 3653 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3654 ResourceMark rm(THREAD); 3655 ThreadsListEnumerator tle(THREAD, false, false); 3656 JvmtiVMObjectAllocEventCollector oam; 3657 3658 int num_threads = tle.num_threads(); 3659 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3660 objArrayHandle threads_ah(THREAD, r); 3661 3662 for (int i = 0; i < num_threads; i++) { 3663 Handle h = tle.get_threadObj(i); 3664 threads_ah->obj_at_put(i, h()); 3665 } 3666 3667 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3668 JVM_END 3669 3670 3671 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3672 // Return StackTraceElement[][], each element is the stack trace of a thread in 3673 // the corresponding entry in the given threads array 3674 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3675 JVMWrapper("JVM_DumpThreads"); 3676 JvmtiVMObjectAllocEventCollector oam; 3677 3678 // Check if threads is null 3679 if (threads == NULL) { 3680 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3681 } 3682 3683 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3684 objArrayHandle ah(THREAD, a); 3685 int num_threads = ah->length(); 3686 // check if threads is non-empty array 3687 if (num_threads == 0) { 3688 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3689 } 3690 3691 // check if threads is not an array of objects of Thread class 3692 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3693 if (k != SystemDictionary::Thread_klass()) { 3694 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3695 } 3696 3697 ResourceMark rm(THREAD); 3698 3699 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3700 for (int i = 0; i < num_threads; i++) { 3701 oop thread_obj = ah->obj_at(i); 3702 instanceHandle h(THREAD, (instanceOop) thread_obj); 3703 thread_handle_array->append(h); 3704 } 3705 3706 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3707 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3708 3709 JVM_END 3710 3711 // JVM monitoring and management support 3712 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3713 return Management::get_jmm_interface(version); 3714 JVM_END 3715 3716 // com.sun.tools.attach.VirtualMachine agent properties support 3717 // 3718 // Initialize the agent properties with the properties maintained in the VM 3719 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3720 JVMWrapper("JVM_InitAgentProperties"); 3721 ResourceMark rm; 3722 3723 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3724 3725 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3726 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3727 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3728 return properties; 3729 JVM_END 3730 3731 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3732 { 3733 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3734 JvmtiVMObjectAllocEventCollector oam; 3735 3736 if (ofClass == NULL) { 3737 return NULL; 3738 } 3739 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3740 // Special handling for primitive objects 3741 if (java_lang_Class::is_primitive(mirror())) { 3742 return NULL; 3743 } 3744 Klass* k = java_lang_Class::as_Klass(mirror()); 3745 if (!k->is_instance_klass()) { 3746 return NULL; 3747 } 3748 InstanceKlass* ik = InstanceKlass::cast(k); 3749 int encl_method_class_idx = ik->enclosing_method_class_index(); 3750 if (encl_method_class_idx == 0) { 3751 return NULL; 3752 } 3753 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3754 objArrayHandle dest(THREAD, dest_o); 3755 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3756 dest->obj_at_put(0, enc_k->java_mirror()); 3757 int encl_method_method_idx = ik->enclosing_method_method_index(); 3758 if (encl_method_method_idx != 0) { 3759 Symbol* sym = ik->constants()->symbol_at( 3760 extract_low_short_from_int( 3761 ik->constants()->name_and_type_at(encl_method_method_idx))); 3762 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3763 dest->obj_at_put(1, str()); 3764 sym = ik->constants()->symbol_at( 3765 extract_high_short_from_int( 3766 ik->constants()->name_and_type_at(encl_method_method_idx))); 3767 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3768 dest->obj_at_put(2, str()); 3769 } 3770 return (jobjectArray) JNIHandles::make_local(dest()); 3771 } 3772 JVM_END 3773 3774 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3775 { 3776 memset(info, 0, info_size); 3777 3778 info->jvm_version = Abstract_VM_Version::jvm_version(); 3779 info->patch_version = Abstract_VM_Version::vm_patch_version(); 3780 3781 // when we add a new capability in the jvm_version_info struct, we should also 3782 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3783 // counter defined in runtimeService.cpp. 3784 info->is_attachable = AttachListener::is_attach_supported(); 3785 } 3786 JVM_END 3787 3788 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3789 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3790 ResourceMark rm(THREAD); 3791 3792 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3793 return NULL; 3794 } 3795 3796 char** vm_flags = Arguments::jvm_flags_array(); 3797 char** vm_args = Arguments::jvm_args_array(); 3798 int num_flags = Arguments::num_jvm_flags(); 3799 int num_args = Arguments::num_jvm_args(); 3800 3801 InstanceKlass* ik = SystemDictionary::String_klass(); 3802 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3803 objArrayHandle result_h(THREAD, r); 3804 3805 int index = 0; 3806 for (int j = 0; j < num_flags; j++, index++) { 3807 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3808 result_h->obj_at_put(index, h()); 3809 } 3810 for (int i = 0; i < num_args; i++, index++) { 3811 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3812 result_h->obj_at_put(index, h()); 3813 } 3814 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3815 JVM_END 3816 3817 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3818 return os::get_signal_number(name); 3819 JVM_END