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(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 330 assert(oopDesc::is_oop(d), "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 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 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); 673 674 Handle new_obj(THREAD, new_obj_oop); 675 // Caution: this involves a java upcall, so the clone should be 676 // "gc-robust" by this stage. 677 if (klass->has_finalizer()) { 678 assert(obj->is_instance(), "should be instanceOop"); 679 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 680 new_obj = Handle(THREAD, new_obj_oop); 681 } 682 683 return JNIHandles::make_local(env, new_obj()); 684 JVM_END 685 686 // java.io.File /////////////////////////////////////////////////////////////// 687 688 JVM_LEAF(char*, JVM_NativePath(char* path)) 689 JVMWrapper("JVM_NativePath"); 690 return os::native_path(path); 691 JVM_END 692 693 694 // Misc. class handling /////////////////////////////////////////////////////////// 695 696 697 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 698 JVMWrapper("JVM_GetCallerClass"); 699 700 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 701 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 702 // temporarily for existing code to use until a replacement API is defined. 703 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 704 Klass* k = thread->security_get_caller_class(depth); 705 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 706 } 707 708 // Getting the class of the caller frame. 709 // 710 // The call stack at this point looks something like this: 711 // 712 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 713 // [1] [ @CallerSensitive API.method ] 714 // [.] [ (skipped intermediate frames) ] 715 // [n] [ caller ] 716 vframeStream vfst(thread); 717 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 718 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 719 Method* m = vfst.method(); 720 assert(m != NULL, "sanity"); 721 switch (n) { 722 case 0: 723 // This must only be called from Reflection.getCallerClass 724 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 725 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 726 } 727 // fall-through 728 case 1: 729 // Frame 0 and 1 must be caller sensitive. 730 if (!m->caller_sensitive()) { 731 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 732 } 733 break; 734 default: 735 if (!m->is_ignored_by_security_stack_walk()) { 736 // We have reached the desired frame; return the holder class. 737 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 738 } 739 break; 740 } 741 } 742 return NULL; 743 JVM_END 744 745 746 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 747 JVMWrapper("JVM_FindPrimitiveClass"); 748 oop mirror = NULL; 749 BasicType t = name2type(utf); 750 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 751 mirror = Universe::java_mirror(t); 752 } 753 if (mirror == NULL) { 754 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 755 } else { 756 return (jclass) JNIHandles::make_local(env, mirror); 757 } 758 JVM_END 759 760 761 // Returns a class loaded by the bootstrap class loader; or null 762 // if not found. ClassNotFoundException is not thrown. 763 // FindClassFromBootLoader is exported to the launcher for windows. 764 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 765 const char* name)) 766 JVMWrapper("JVM_FindClassFromBootLoader"); 767 768 // Java libraries should ensure that name is never null... 769 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 770 // It's impossible to create this class; the name cannot fit 771 // into the constant pool. 772 return NULL; 773 } 774 775 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 776 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 777 if (k == NULL) { 778 return NULL; 779 } 780 781 if (log_is_enabled(Debug, class, resolve)) { 782 trace_class_resolution(k); 783 } 784 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 785 JVM_END 786 787 // Find a class with this name in this loader, using the caller's protection domain. 788 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 789 jboolean init, jobject loader, 790 jclass caller)) 791 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 792 // Java libraries should ensure that name is never null... 793 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 794 // It's impossible to create this class; the name cannot fit 795 // into the constant pool. 796 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 797 } 798 799 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 800 801 oop loader_oop = JNIHandles::resolve(loader); 802 oop from_class = JNIHandles::resolve(caller); 803 oop protection_domain = NULL; 804 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 805 // NPE. Put it in another way, the bootstrap class loader has all permission and 806 // thus no checkPackageAccess equivalence in the VM class loader. 807 // The caller is also passed as NULL by the java code if there is no security 808 // manager to avoid the performance cost of getting the calling class. 809 if (from_class != NULL && loader_oop != NULL) { 810 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 811 } 812 813 Handle h_loader(THREAD, loader_oop); 814 Handle h_prot(THREAD, protection_domain); 815 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 816 h_prot, false, THREAD); 817 818 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 819 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 820 } 821 return result; 822 JVM_END 823 824 // Currently only called from the old verifier. 825 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 826 jboolean init, jclass from)) 827 JVMWrapper("JVM_FindClassFromClass"); 828 if (name == NULL) { 829 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 830 } 831 if ((int)strlen(name) > Symbol::max_length()) { 832 // It's impossible to create this class; the name cannot fit 833 // into the constant pool. 834 Exceptions::fthrow(THREAD_AND_LOCATION, 835 vmSymbols::java_lang_NoClassDefFoundError(), 836 "Class name exceeds maximum length of %d: %s", 837 Symbol::max_length(), 838 name); 839 return 0; 840 } 841 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 842 oop from_class_oop = JNIHandles::resolve(from); 843 Klass* from_class = (from_class_oop == NULL) 844 ? (Klass*)NULL 845 : java_lang_Class::as_Klass(from_class_oop); 846 oop class_loader = NULL; 847 oop protection_domain = NULL; 848 if (from_class != NULL) { 849 class_loader = from_class->class_loader(); 850 protection_domain = from_class->protection_domain(); 851 } 852 Handle h_loader(THREAD, class_loader); 853 Handle h_prot (THREAD, protection_domain); 854 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 855 h_prot, true, thread); 856 857 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 858 // this function is generally only used for class loading during verification. 859 ResourceMark rm; 860 oop from_mirror = JNIHandles::resolve_non_null(from); 861 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 862 const char * from_name = from_class->external_name(); 863 864 oop mirror = JNIHandles::resolve_non_null(result); 865 Klass* to_class = java_lang_Class::as_Klass(mirror); 866 const char * to = to_class->external_name(); 867 log_debug(class, resolve)("%s %s (verification)", from_name, to); 868 } 869 870 return result; 871 JVM_END 872 873 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 874 if (loader.is_null()) { 875 return; 876 } 877 878 // check whether the current caller thread holds the lock or not. 879 // If not, increment the corresponding counter 880 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 881 ObjectSynchronizer::owner_self) { 882 counter->inc(); 883 } 884 } 885 886 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 887 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 888 jobject loader, const jbyte *buf, 889 jsize len, jobject pd, const char *source, 890 TRAPS) { 891 if (source == NULL) source = "__JVM_DefineClass__"; 892 893 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 894 JavaThread* jt = (JavaThread*) THREAD; 895 896 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 897 ClassLoader::perf_define_appclass_selftime(), 898 ClassLoader::perf_define_appclasses(), 899 jt->get_thread_stat()->perf_recursion_counts_addr(), 900 jt->get_thread_stat()->perf_timers_addr(), 901 PerfClassTraceTime::DEFINE_CLASS); 902 903 if (UsePerfData) { 904 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 905 } 906 907 // Since exceptions can be thrown, class initialization can take place 908 // if name is NULL no check for class name in .class stream has to be made. 909 TempNewSymbol class_name = NULL; 910 if (name != NULL) { 911 const int str_len = (int)strlen(name); 912 if (str_len > Symbol::max_length()) { 913 // It's impossible to create this class; the name cannot fit 914 // into the constant pool. 915 Exceptions::fthrow(THREAD_AND_LOCATION, 916 vmSymbols::java_lang_NoClassDefFoundError(), 917 "Class name exceeds maximum length of %d: %s", 918 Symbol::max_length(), 919 name); 920 return 0; 921 } 922 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 923 } 924 925 ResourceMark rm(THREAD); 926 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 927 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 928 if (UsePerfData) { 929 is_lock_held_by_thread(class_loader, 930 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 931 THREAD); 932 } 933 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 934 Klass* k = SystemDictionary::resolve_from_stream(class_name, 935 class_loader, 936 protection_domain, 937 &st, 938 CHECK_NULL); 939 940 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 941 trace_class_resolution(k); 942 } 943 944 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 945 } 946 947 948 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 949 JVMWrapper("JVM_DefineClass"); 950 951 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 952 JVM_END 953 954 955 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 956 JVMWrapper("JVM_DefineClassWithSource"); 957 958 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 959 JVM_END 960 961 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 962 JVMWrapper("JVM_FindLoadedClass"); 963 ResourceMark rm(THREAD); 964 965 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 966 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 967 968 const char* str = java_lang_String::as_utf8_string(string()); 969 // Sanity check, don't expect null 970 if (str == NULL) return NULL; 971 972 const int str_len = (int)strlen(str); 973 if (str_len > Symbol::max_length()) { 974 // It's impossible to create this class; the name cannot fit 975 // into the constant pool. 976 return NULL; 977 } 978 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 979 980 // Security Note: 981 // The Java level wrapper will perform the necessary security check allowing 982 // us to pass the NULL as the initiating class loader. 983 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 984 if (UsePerfData) { 985 is_lock_held_by_thread(h_loader, 986 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 987 THREAD); 988 } 989 990 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 991 h_loader, 992 Handle(), 993 CHECK_NULL); 994 #if INCLUDE_CDS 995 if (k == NULL) { 996 // If the class is not already loaded, try to see if it's in the shared 997 // archive for the current classloader (h_loader). 998 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 999 } 1000 #endif 1001 return (k == NULL) ? NULL : 1002 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1003 JVM_END 1004 1005 // Module support ////////////////////////////////////////////////////////////////////////////// 1006 1007 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1008 jstring location, const char* const* packages, jsize num_packages)) 1009 JVMWrapper("JVM_DefineModule"); 1010 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1011 JVM_END 1012 1013 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1014 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1015 Modules::set_bootloader_unnamed_module(module, CHECK); 1016 JVM_END 1017 1018 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1019 JVMWrapper("JVM_AddModuleExports"); 1020 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1021 JVM_END 1022 1023 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1024 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1025 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1026 JVM_END 1027 1028 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1029 JVMWrapper("JVM_AddModuleExportsToAll"); 1030 Modules::add_module_exports(from_module, package, NULL, CHECK); 1031 JVM_END 1032 1033 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1034 JVMWrapper("JVM_AddReadsModule"); 1035 Modules::add_reads_module(from_module, source_module, CHECK); 1036 JVM_END 1037 1038 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1039 1040 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1041 assert (cls != NULL, "illegal class"); 1042 JVMWrapper("JVM_GetClassName"); 1043 JvmtiVMObjectAllocEventCollector oam; 1044 ResourceMark rm(THREAD); 1045 const char* name; 1046 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1047 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1048 } else { 1049 // Consider caching interned string in Klass 1050 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1051 assert(k->is_klass(), "just checking"); 1052 name = k->external_name(); 1053 } 1054 oop result = StringTable::intern((char*) name, CHECK_NULL); 1055 return (jstring) JNIHandles::make_local(env, result); 1056 JVM_END 1057 1058 1059 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1060 JVMWrapper("JVM_GetClassInterfaces"); 1061 JvmtiVMObjectAllocEventCollector oam; 1062 oop mirror = JNIHandles::resolve_non_null(cls); 1063 1064 // Special handling for primitive objects 1065 if (java_lang_Class::is_primitive(mirror)) { 1066 // Primitive objects does not have any interfaces 1067 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1068 return (jobjectArray) JNIHandles::make_local(env, r); 1069 } 1070 1071 Klass* klass = java_lang_Class::as_Klass(mirror); 1072 // Figure size of result array 1073 int size; 1074 if (klass->is_instance_klass()) { 1075 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1076 } else { 1077 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1078 size = 2; 1079 } 1080 1081 // Allocate result array 1082 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1083 objArrayHandle result (THREAD, r); 1084 // Fill in result 1085 if (klass->is_instance_klass()) { 1086 // Regular instance klass, fill in all local interfaces 1087 for (int index = 0; index < size; index++) { 1088 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1089 result->obj_at_put(index, k->java_mirror()); 1090 } 1091 } else { 1092 // All arrays implement java.lang.Cloneable and java.io.Serializable 1093 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1094 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1095 } 1096 return (jobjectArray) JNIHandles::make_local(env, result()); 1097 JVM_END 1098 1099 1100 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1101 JVMWrapper("JVM_IsInterface"); 1102 oop mirror = JNIHandles::resolve_non_null(cls); 1103 if (java_lang_Class::is_primitive(mirror)) { 1104 return JNI_FALSE; 1105 } 1106 Klass* k = java_lang_Class::as_Klass(mirror); 1107 jboolean result = k->is_interface(); 1108 assert(!result || k->is_instance_klass(), 1109 "all interfaces are instance types"); 1110 // The compiler intrinsic for isInterface tests the 1111 // Klass::_access_flags bits in the same way. 1112 return result; 1113 JVM_END 1114 1115 1116 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1117 JVMWrapper("JVM_GetClassSigners"); 1118 JvmtiVMObjectAllocEventCollector oam; 1119 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1120 // There are no signers for primitive types 1121 return NULL; 1122 } 1123 1124 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1125 1126 // If there are no signers set in the class, or if the class 1127 // is an array, return NULL. 1128 if (signers == NULL) return NULL; 1129 1130 // copy of the signers array 1131 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1132 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1133 for (int index = 0; index < signers->length(); index++) { 1134 signers_copy->obj_at_put(index, signers->obj_at(index)); 1135 } 1136 1137 // return the copy 1138 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1139 JVM_END 1140 1141 1142 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1143 JVMWrapper("JVM_SetClassSigners"); 1144 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1145 // This call is ignored for primitive types and arrays. 1146 // Signers are only set once, ClassLoader.java, and thus shouldn't 1147 // be called with an array. Only the bootstrap loader creates arrays. 1148 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1149 if (k->is_instance_klass()) { 1150 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1151 } 1152 } 1153 JVM_END 1154 1155 1156 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1157 JVMWrapper("JVM_GetProtectionDomain"); 1158 if (JNIHandles::resolve(cls) == NULL) { 1159 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1160 } 1161 1162 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1163 // Primitive types does not have a protection domain. 1164 return NULL; 1165 } 1166 1167 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1168 return (jobject) JNIHandles::make_local(env, pd); 1169 JVM_END 1170 1171 1172 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) { 1173 // If there is a security manager and protection domain, check the access 1174 // in the protection domain, otherwise it is authorized. 1175 if (java_lang_System::has_security_manager()) { 1176 1177 // For bootstrapping, if pd implies method isn't in the JDK, allow 1178 // this context to revert to older behavior. 1179 // In this case the isAuthorized field in AccessControlContext is also not 1180 // present. 1181 if (Universe::protection_domain_implies_method() == NULL) { 1182 return true; 1183 } 1184 1185 // Whitelist certain access control contexts 1186 if (java_security_AccessControlContext::is_authorized(context)) { 1187 return true; 1188 } 1189 1190 oop prot = klass->protection_domain(); 1191 if (prot != NULL) { 1192 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1193 // in the new wrapper. 1194 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1195 Handle h_prot(THREAD, prot); 1196 JavaValue result(T_BOOLEAN); 1197 JavaCallArguments args(h_prot); 1198 JavaCalls::call(&result, m, &args, CHECK_false); 1199 return (result.get_jboolean() != 0); 1200 } 1201 } 1202 return true; 1203 } 1204 1205 // Create an AccessControlContext with a protection domain with null codesource 1206 // and null permissions - which gives no permissions. 1207 oop create_dummy_access_control_context(TRAPS) { 1208 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1209 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1210 // Call constructor ProtectionDomain(null, null); 1211 JavaValue result(T_VOID); 1212 JavaCalls::call_special(&result, obj, pd_klass, 1213 vmSymbols::object_initializer_name(), 1214 vmSymbols::codesource_permissioncollection_signature(), 1215 Handle(), Handle(), CHECK_NULL); 1216 1217 // new ProtectionDomain[] {pd}; 1218 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1219 context->obj_at_put(0, obj()); 1220 1221 // new AccessControlContext(new ProtectionDomain[] {pd}) 1222 objArrayHandle h_context(THREAD, context); 1223 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1224 return acc; 1225 } 1226 1227 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1228 JVMWrapper("JVM_DoPrivileged"); 1229 1230 if (action == NULL) { 1231 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1232 } 1233 1234 // Compute the frame initiating the do privileged operation and setup the privileged stack 1235 vframeStream vfst(thread); 1236 vfst.security_get_caller_frame(1); 1237 1238 if (vfst.at_end()) { 1239 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1240 } 1241 1242 Method* method = vfst.method(); 1243 InstanceKlass* klass = method->method_holder(); 1244 1245 // Check that action object understands "Object run()" 1246 Handle h_context; 1247 if (context != NULL) { 1248 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1249 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1250 if (!authorized) { 1251 // Create an unprivileged access control object and call it's run function 1252 // instead. 1253 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1254 h_context = Handle(THREAD, noprivs); 1255 } 1256 } 1257 1258 // Check that action object understands "Object run()" 1259 Handle object (THREAD, JNIHandles::resolve(action)); 1260 1261 // get run() method 1262 Method* m_oop = object->klass()->uncached_lookup_method( 1263 vmSymbols::run_method_name(), 1264 vmSymbols::void_object_signature(), 1265 Klass::find_overpass); 1266 1267 // See if there is a default method for "Object run()". 1268 if (m_oop == NULL && object->klass()->is_instance_klass()) { 1269 InstanceKlass* iklass = InstanceKlass::cast(object->klass()); 1270 m_oop = iklass->lookup_method_in_ordered_interfaces( 1271 vmSymbols::run_method_name(), 1272 vmSymbols::void_object_signature()); 1273 } 1274 1275 methodHandle m (THREAD, m_oop); 1276 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) { 1277 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1278 } 1279 1280 // Stack allocated list of privileged stack elements 1281 PrivilegedElement pi; 1282 if (!vfst.at_end()) { 1283 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1284 thread->set_privileged_stack_top(&pi); 1285 } 1286 1287 1288 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1289 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1290 Handle pending_exception; 1291 JavaValue result(T_OBJECT); 1292 JavaCallArguments args(object); 1293 JavaCalls::call(&result, m, &args, THREAD); 1294 1295 // done with action, remove ourselves from the list 1296 if (!vfst.at_end()) { 1297 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1298 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1299 } 1300 1301 if (HAS_PENDING_EXCEPTION) { 1302 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1303 CLEAR_PENDING_EXCEPTION; 1304 // JVMTI has already reported the pending exception 1305 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1306 if (THREAD->is_Java_thread()) { 1307 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1308 } 1309 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1310 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1311 // Throw a java.security.PrivilegedActionException(Exception e) exception 1312 JavaCallArguments args(pending_exception); 1313 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1314 vmSymbols::exception_void_signature(), 1315 &args); 1316 } 1317 } 1318 1319 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1320 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1321 JVM_END 1322 1323 1324 // Returns the inherited_access_control_context field of the running thread. 1325 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1326 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1327 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1328 return JNIHandles::make_local(env, result); 1329 JVM_END 1330 1331 class RegisterArrayForGC { 1332 private: 1333 JavaThread *_thread; 1334 public: 1335 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1336 _thread = thread; 1337 _thread->register_array_for_gc(array); 1338 } 1339 1340 ~RegisterArrayForGC() { 1341 _thread->register_array_for_gc(NULL); 1342 } 1343 }; 1344 1345 1346 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1347 JVMWrapper("JVM_GetStackAccessControlContext"); 1348 if (!UsePrivilegedStack) return NULL; 1349 1350 ResourceMark rm(THREAD); 1351 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1352 JvmtiVMObjectAllocEventCollector oam; 1353 1354 // count the protection domains on the execution stack. We collapse 1355 // duplicate consecutive protection domains into a single one, as 1356 // well as stopping when we hit a privileged frame. 1357 1358 // Use vframeStream to iterate through Java frames 1359 vframeStream vfst(thread); 1360 1361 oop previous_protection_domain = NULL; 1362 Handle privileged_context(thread, NULL); 1363 bool is_privileged = false; 1364 oop protection_domain = NULL; 1365 1366 for(; !vfst.at_end(); vfst.next()) { 1367 // get method of frame 1368 Method* method = vfst.method(); 1369 intptr_t* frame_id = vfst.frame_id(); 1370 1371 // check the privileged frames to see if we have a match 1372 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1373 // this frame is privileged 1374 is_privileged = true; 1375 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1376 protection_domain = thread->privileged_stack_top()->protection_domain(); 1377 } else { 1378 protection_domain = method->method_holder()->protection_domain(); 1379 } 1380 1381 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1382 local_array->push(protection_domain); 1383 previous_protection_domain = protection_domain; 1384 } 1385 1386 if (is_privileged) break; 1387 } 1388 1389 1390 // either all the domains on the stack were system domains, or 1391 // we had a privileged system domain 1392 if (local_array->is_empty()) { 1393 if (is_privileged && privileged_context.is_null()) return NULL; 1394 1395 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1396 return JNIHandles::make_local(env, result); 1397 } 1398 1399 // the resource area must be registered in case of a gc 1400 RegisterArrayForGC ragc(thread, local_array); 1401 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1402 local_array->length(), CHECK_NULL); 1403 objArrayHandle h_context(thread, context); 1404 for (int index = 0; index < local_array->length(); index++) { 1405 h_context->obj_at_put(index, local_array->at(index)); 1406 } 1407 1408 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1409 1410 return JNIHandles::make_local(env, result); 1411 JVM_END 1412 1413 1414 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1415 JVMWrapper("JVM_IsArrayClass"); 1416 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1417 return (k != NULL) && k->is_array_klass() ? true : false; 1418 JVM_END 1419 1420 1421 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1422 JVMWrapper("JVM_IsPrimitiveClass"); 1423 oop mirror = JNIHandles::resolve_non_null(cls); 1424 return (jboolean) java_lang_Class::is_primitive(mirror); 1425 JVM_END 1426 1427 1428 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1429 JVMWrapper("JVM_GetClassModifiers"); 1430 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1431 // Primitive type 1432 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1433 } 1434 1435 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1436 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1437 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1438 return k->modifier_flags(); 1439 JVM_END 1440 1441 1442 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1443 1444 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1445 JvmtiVMObjectAllocEventCollector oam; 1446 // ofClass is a reference to a java_lang_Class object. The mirror object 1447 // of an InstanceKlass 1448 1449 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1450 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1451 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1452 return (jobjectArray)JNIHandles::make_local(env, result); 1453 } 1454 1455 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1456 InnerClassesIterator iter(k); 1457 1458 if (iter.length() == 0) { 1459 // Neither an inner nor outer class 1460 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1461 return (jobjectArray)JNIHandles::make_local(env, result); 1462 } 1463 1464 // find inner class info 1465 constantPoolHandle cp(thread, k->constants()); 1466 int length = iter.length(); 1467 1468 // Allocate temp. result array 1469 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1470 objArrayHandle result (THREAD, r); 1471 int members = 0; 1472 1473 for (; !iter.done(); iter.next()) { 1474 int ioff = iter.inner_class_info_index(); 1475 int ooff = iter.outer_class_info_index(); 1476 1477 if (ioff != 0 && ooff != 0) { 1478 // Check to see if the name matches the class we're looking for 1479 // before attempting to find the class. 1480 if (cp->klass_name_at_matches(k, ooff)) { 1481 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1482 if (outer_klass == k) { 1483 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1484 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1485 1486 // Throws an exception if outer klass has not declared k as 1487 // an inner klass 1488 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1489 1490 result->obj_at_put(members, inner_klass->java_mirror()); 1491 members++; 1492 } 1493 } 1494 } 1495 } 1496 1497 if (members != length) { 1498 // Return array of right length 1499 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1500 for(int i = 0; i < members; i++) { 1501 res->obj_at_put(i, result->obj_at(i)); 1502 } 1503 return (jobjectArray)JNIHandles::make_local(env, res); 1504 } 1505 1506 return (jobjectArray)JNIHandles::make_local(env, result()); 1507 JVM_END 1508 1509 1510 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1511 { 1512 // ofClass is a reference to a java_lang_Class object. 1513 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1514 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1515 return NULL; 1516 } 1517 1518 bool inner_is_member = false; 1519 Klass* outer_klass 1520 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1521 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1522 if (outer_klass == NULL) return NULL; // already a top-level class 1523 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1524 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1525 } 1526 JVM_END 1527 1528 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1529 { 1530 oop mirror = JNIHandles::resolve_non_null(cls); 1531 if (java_lang_Class::is_primitive(mirror) || 1532 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1533 return NULL; 1534 } 1535 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1536 int ooff = 0, noff = 0; 1537 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1538 if (noff != 0) { 1539 constantPoolHandle i_cp(thread, k->constants()); 1540 Symbol* name = i_cp->symbol_at(noff); 1541 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1542 return (jstring) JNIHandles::make_local(env, str()); 1543 } 1544 } 1545 return NULL; 1546 } 1547 JVM_END 1548 1549 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1550 assert (cls != NULL, "illegal class"); 1551 JVMWrapper("JVM_GetClassSignature"); 1552 JvmtiVMObjectAllocEventCollector oam; 1553 ResourceMark rm(THREAD); 1554 // Return null for arrays and primatives 1555 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1556 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1557 if (k->is_instance_klass()) { 1558 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1559 if (sym == NULL) return NULL; 1560 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1561 return (jstring) JNIHandles::make_local(env, str()); 1562 } 1563 } 1564 return NULL; 1565 JVM_END 1566 1567 1568 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1569 assert (cls != NULL, "illegal class"); 1570 JVMWrapper("JVM_GetClassAnnotations"); 1571 1572 // Return null for arrays and primitives 1573 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1574 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1575 if (k->is_instance_klass()) { 1576 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1577 return (jbyteArray) JNIHandles::make_local(env, a); 1578 } 1579 } 1580 return NULL; 1581 JVM_END 1582 1583 1584 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1585 // some of this code was adapted from from jni_FromReflectedField 1586 1587 oop reflected = JNIHandles::resolve_non_null(field); 1588 oop mirror = java_lang_reflect_Field::clazz(reflected); 1589 Klass* k = java_lang_Class::as_Klass(mirror); 1590 int slot = java_lang_reflect_Field::slot(reflected); 1591 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1592 1593 InstanceKlass* ik = InstanceKlass::cast(k); 1594 intptr_t offset = ik->field_offset(slot); 1595 1596 if (modifiers & JVM_ACC_STATIC) { 1597 // for static fields we only look in the current class 1598 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1599 assert(false, "cannot find static field"); 1600 return false; 1601 } 1602 } else { 1603 // for instance fields we start with the current class and work 1604 // our way up through the superclass chain 1605 if (!ik->find_field_from_offset(offset, false, &fd)) { 1606 assert(false, "cannot find instance field"); 1607 return false; 1608 } 1609 } 1610 return true; 1611 } 1612 1613 static Method* jvm_get_method_common(jobject method) { 1614 // some of this code was adapted from from jni_FromReflectedMethod 1615 1616 oop reflected = JNIHandles::resolve_non_null(method); 1617 oop mirror = NULL; 1618 int slot = 0; 1619 1620 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1621 mirror = java_lang_reflect_Constructor::clazz(reflected); 1622 slot = java_lang_reflect_Constructor::slot(reflected); 1623 } else { 1624 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1625 "wrong type"); 1626 mirror = java_lang_reflect_Method::clazz(reflected); 1627 slot = java_lang_reflect_Method::slot(reflected); 1628 } 1629 Klass* k = java_lang_Class::as_Klass(mirror); 1630 1631 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1632 assert(m != NULL, "cannot find method"); 1633 return m; // caller has to deal with NULL in product mode 1634 } 1635 1636 /* Type use annotations support (JDK 1.8) */ 1637 1638 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1639 assert (cls != NULL, "illegal class"); 1640 JVMWrapper("JVM_GetClassTypeAnnotations"); 1641 ResourceMark rm(THREAD); 1642 // Return null for arrays and primitives 1643 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1644 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1645 if (k->is_instance_klass()) { 1646 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1647 if (type_annotations != NULL) { 1648 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1649 return (jbyteArray) JNIHandles::make_local(env, a); 1650 } 1651 } 1652 } 1653 return NULL; 1654 JVM_END 1655 1656 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1657 assert (method != NULL, "illegal method"); 1658 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1659 1660 // method is a handle to a java.lang.reflect.Method object 1661 Method* m = jvm_get_method_common(method); 1662 if (m == NULL) { 1663 return NULL; 1664 } 1665 1666 AnnotationArray* type_annotations = m->type_annotations(); 1667 if (type_annotations != NULL) { 1668 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1669 return (jbyteArray) JNIHandles::make_local(env, a); 1670 } 1671 1672 return NULL; 1673 JVM_END 1674 1675 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1676 assert (field != NULL, "illegal field"); 1677 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1678 1679 fieldDescriptor fd; 1680 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1681 if (!gotFd) { 1682 return NULL; 1683 } 1684 1685 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1686 JVM_END 1687 1688 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1689 if (!cp->is_within_bounds(index)) { 1690 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1691 } 1692 } 1693 1694 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1695 { 1696 JVMWrapper("JVM_GetMethodParameters"); 1697 // method is a handle to a java.lang.reflect.Method object 1698 Method* method_ptr = jvm_get_method_common(method); 1699 methodHandle mh (THREAD, method_ptr); 1700 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1701 const int num_params = mh->method_parameters_length(); 1702 1703 if (num_params < 0) { 1704 // A -1 return value from method_parameters_length means there is no 1705 // parameter data. Return null to indicate this to the reflection 1706 // API. 1707 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1708 return (jobjectArray)NULL; 1709 } else { 1710 // Otherwise, we return something up to reflection, even if it is 1711 // a zero-length array. Why? Because in some cases this can 1712 // trigger a MalformedParametersException. 1713 1714 // make sure all the symbols are properly formatted 1715 for (int i = 0; i < num_params; i++) { 1716 MethodParametersElement* params = mh->method_parameters_start(); 1717 int index = params[i].name_cp_index; 1718 bounds_check(mh->constants(), index, CHECK_NULL); 1719 1720 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1721 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1722 "Wrong type at constant pool index"); 1723 } 1724 1725 } 1726 1727 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1728 objArrayHandle result (THREAD, result_oop); 1729 1730 for (int i = 0; i < num_params; i++) { 1731 MethodParametersElement* params = mh->method_parameters_start(); 1732 // For a 0 index, give a NULL symbol 1733 Symbol* sym = 0 != params[i].name_cp_index ? 1734 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1735 int flags = params[i].flags; 1736 oop param = Reflection::new_parameter(reflected_method, i, sym, 1737 flags, CHECK_NULL); 1738 result->obj_at_put(i, param); 1739 } 1740 return (jobjectArray)JNIHandles::make_local(env, result()); 1741 } 1742 } 1743 JVM_END 1744 1745 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1746 1747 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1748 { 1749 JVMWrapper("JVM_GetClassDeclaredFields"); 1750 JvmtiVMObjectAllocEventCollector oam; 1751 1752 // Exclude primitive types and array types 1753 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1754 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1755 // Return empty array 1756 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1757 return (jobjectArray) JNIHandles::make_local(env, res); 1758 } 1759 1760 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1761 constantPoolHandle cp(THREAD, k->constants()); 1762 1763 // Ensure class is linked 1764 k->link_class(CHECK_NULL); 1765 1766 // Allocate result 1767 int num_fields; 1768 1769 if (publicOnly) { 1770 num_fields = 0; 1771 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1772 if (fs.access_flags().is_public()) ++num_fields; 1773 } 1774 } else { 1775 num_fields = k->java_fields_count(); 1776 } 1777 1778 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1779 objArrayHandle result (THREAD, r); 1780 1781 int out_idx = 0; 1782 fieldDescriptor fd; 1783 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1784 if (!publicOnly || fs.access_flags().is_public()) { 1785 fd.reinitialize(k, fs.index()); 1786 oop field = Reflection::new_field(&fd, CHECK_NULL); 1787 result->obj_at_put(out_idx, field); 1788 ++out_idx; 1789 } 1790 } 1791 assert(out_idx == num_fields, "just checking"); 1792 return (jobjectArray) JNIHandles::make_local(env, result()); 1793 } 1794 JVM_END 1795 1796 static bool select_method(const methodHandle& method, bool want_constructor) { 1797 if (want_constructor) { 1798 return (method->is_initializer() && !method->is_static()); 1799 } else { 1800 return (!method->is_initializer() && !method->is_overpass()); 1801 } 1802 } 1803 1804 static jobjectArray get_class_declared_methods_helper( 1805 JNIEnv *env, 1806 jclass ofClass, jboolean publicOnly, 1807 bool want_constructor, 1808 Klass* klass, TRAPS) { 1809 1810 JvmtiVMObjectAllocEventCollector oam; 1811 1812 // Exclude primitive types and array types 1813 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1814 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1815 // Return empty array 1816 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1817 return (jobjectArray) JNIHandles::make_local(env, res); 1818 } 1819 1820 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1821 1822 // Ensure class is linked 1823 k->link_class(CHECK_NULL); 1824 1825 Array<Method*>* methods = k->methods(); 1826 int methods_length = methods->length(); 1827 1828 // Save original method_idnum in case of redefinition, which can change 1829 // the idnum of obsolete methods. The new method will have the same idnum 1830 // but if we refresh the methods array, the counts will be wrong. 1831 ResourceMark rm(THREAD); 1832 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1833 int num_methods = 0; 1834 1835 for (int i = 0; i < methods_length; i++) { 1836 methodHandle method(THREAD, methods->at(i)); 1837 if (select_method(method, want_constructor)) { 1838 if (!publicOnly || method->is_public()) { 1839 idnums->push(method->method_idnum()); 1840 ++num_methods; 1841 } 1842 } 1843 } 1844 1845 // Allocate result 1846 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1847 objArrayHandle result (THREAD, r); 1848 1849 // Now just put the methods that we selected above, but go by their idnum 1850 // in case of redefinition. The methods can be redefined at any safepoint, 1851 // so above when allocating the oop array and below when creating reflect 1852 // objects. 1853 for (int i = 0; i < num_methods; i++) { 1854 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1855 if (method.is_null()) { 1856 // Method may have been deleted and seems this API can handle null 1857 // Otherwise should probably put a method that throws NSME 1858 result->obj_at_put(i, NULL); 1859 } else { 1860 oop m; 1861 if (want_constructor) { 1862 m = Reflection::new_constructor(method, CHECK_NULL); 1863 } else { 1864 m = Reflection::new_method(method, false, CHECK_NULL); 1865 } 1866 result->obj_at_put(i, m); 1867 } 1868 } 1869 1870 return (jobjectArray) JNIHandles::make_local(env, result()); 1871 } 1872 1873 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1874 { 1875 JVMWrapper("JVM_GetClassDeclaredMethods"); 1876 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1877 /*want_constructor*/ false, 1878 SystemDictionary::reflect_Method_klass(), THREAD); 1879 } 1880 JVM_END 1881 1882 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1883 { 1884 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1885 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1886 /*want_constructor*/ true, 1887 SystemDictionary::reflect_Constructor_klass(), THREAD); 1888 } 1889 JVM_END 1890 1891 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1892 { 1893 JVMWrapper("JVM_GetClassAccessFlags"); 1894 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1895 // Primitive type 1896 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1897 } 1898 1899 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1900 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1901 } 1902 JVM_END 1903 1904 1905 // Constant pool access ////////////////////////////////////////////////////////// 1906 1907 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1908 { 1909 JVMWrapper("JVM_GetClassConstantPool"); 1910 JvmtiVMObjectAllocEventCollector oam; 1911 1912 // Return null for primitives and arrays 1913 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1914 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1915 if (k->is_instance_klass()) { 1916 InstanceKlass* k_h = InstanceKlass::cast(k); 1917 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1918 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1919 return JNIHandles::make_local(jcp()); 1920 } 1921 } 1922 return NULL; 1923 } 1924 JVM_END 1925 1926 1927 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1928 { 1929 JVMWrapper("JVM_ConstantPoolGetSize"); 1930 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1931 return cp->length(); 1932 } 1933 JVM_END 1934 1935 1936 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1937 { 1938 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1939 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1940 bounds_check(cp, index, CHECK_NULL); 1941 constantTag tag = cp->tag_at(index); 1942 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1943 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1944 } 1945 Klass* k = cp->klass_at(index, CHECK_NULL); 1946 return (jclass) JNIHandles::make_local(k->java_mirror()); 1947 } 1948 JVM_END 1949 1950 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1951 { 1952 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1953 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1954 bounds_check(cp, index, CHECK_NULL); 1955 constantTag tag = cp->tag_at(index); 1956 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1957 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1958 } 1959 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1960 if (k == NULL) return NULL; 1961 return (jclass) JNIHandles::make_local(k->java_mirror()); 1962 } 1963 JVM_END 1964 1965 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 1966 constantTag tag = cp->tag_at(index); 1967 if (!tag.is_method() && !tag.is_interface_method()) { 1968 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1969 } 1970 int klass_ref = cp->uncached_klass_ref_index_at(index); 1971 Klass* k_o; 1972 if (force_resolution) { 1973 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1974 } else { 1975 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1976 if (k_o == NULL) return NULL; 1977 } 1978 InstanceKlass* k = InstanceKlass::cast(k_o); 1979 Symbol* name = cp->uncached_name_ref_at(index); 1980 Symbol* sig = cp->uncached_signature_ref_at(index); 1981 methodHandle m (THREAD, k->find_method(name, sig)); 1982 if (m.is_null()) { 1983 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1984 } 1985 oop method; 1986 if (!m->is_initializer() || m->is_static()) { 1987 method = Reflection::new_method(m, true, CHECK_NULL); 1988 } else { 1989 method = Reflection::new_constructor(m, CHECK_NULL); 1990 } 1991 return JNIHandles::make_local(method); 1992 } 1993 1994 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1995 { 1996 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1997 JvmtiVMObjectAllocEventCollector oam; 1998 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1999 bounds_check(cp, index, CHECK_NULL); 2000 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2001 return res; 2002 } 2003 JVM_END 2004 2005 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2006 { 2007 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2008 JvmtiVMObjectAllocEventCollector oam; 2009 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2010 bounds_check(cp, index, CHECK_NULL); 2011 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2012 return res; 2013 } 2014 JVM_END 2015 2016 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2017 constantTag tag = cp->tag_at(index); 2018 if (!tag.is_field()) { 2019 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2020 } 2021 int klass_ref = cp->uncached_klass_ref_index_at(index); 2022 Klass* k_o; 2023 if (force_resolution) { 2024 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2025 } else { 2026 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2027 if (k_o == NULL) return NULL; 2028 } 2029 InstanceKlass* k = InstanceKlass::cast(k_o); 2030 Symbol* name = cp->uncached_name_ref_at(index); 2031 Symbol* sig = cp->uncached_signature_ref_at(index); 2032 fieldDescriptor fd; 2033 Klass* target_klass = k->find_field(name, sig, &fd); 2034 if (target_klass == NULL) { 2035 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2036 } 2037 oop field = Reflection::new_field(&fd, CHECK_NULL); 2038 return JNIHandles::make_local(field); 2039 } 2040 2041 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2042 { 2043 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2044 JvmtiVMObjectAllocEventCollector oam; 2045 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2046 bounds_check(cp, index, CHECK_NULL); 2047 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2048 return res; 2049 } 2050 JVM_END 2051 2052 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2053 { 2054 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2055 JvmtiVMObjectAllocEventCollector oam; 2056 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2057 bounds_check(cp, index, CHECK_NULL); 2058 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2059 return res; 2060 } 2061 JVM_END 2062 2063 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2064 { 2065 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2066 JvmtiVMObjectAllocEventCollector oam; 2067 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2068 bounds_check(cp, index, CHECK_NULL); 2069 constantTag tag = cp->tag_at(index); 2070 if (!tag.is_field_or_method()) { 2071 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2072 } 2073 int klass_ref = cp->uncached_klass_ref_index_at(index); 2074 Symbol* klass_name = cp->klass_name_at(klass_ref); 2075 Symbol* member_name = cp->uncached_name_ref_at(index); 2076 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2077 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2078 objArrayHandle dest(THREAD, dest_o); 2079 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2080 dest->obj_at_put(0, str()); 2081 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2082 dest->obj_at_put(1, str()); 2083 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2084 dest->obj_at_put(2, str()); 2085 return (jobjectArray) JNIHandles::make_local(dest()); 2086 } 2087 JVM_END 2088 2089 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2090 { 2091 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2092 JvmtiVMObjectAllocEventCollector oam; 2093 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2094 bounds_check(cp, index, CHECK_0); 2095 constantTag tag = cp->tag_at(index); 2096 if (!tag.is_field_or_method()) { 2097 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2098 } 2099 return (jint) cp->uncached_klass_ref_index_at(index); 2100 } 2101 JVM_END 2102 2103 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2104 { 2105 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2106 JvmtiVMObjectAllocEventCollector oam; 2107 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2108 bounds_check(cp, index, CHECK_0); 2109 constantTag tag = cp->tag_at(index); 2110 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2111 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2112 } 2113 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2114 } 2115 JVM_END 2116 2117 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2118 { 2119 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2120 JvmtiVMObjectAllocEventCollector oam; 2121 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2122 bounds_check(cp, index, CHECK_NULL); 2123 constantTag tag = cp->tag_at(index); 2124 if (!tag.is_name_and_type()) { 2125 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2126 } 2127 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2128 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2129 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2130 objArrayHandle dest(THREAD, dest_o); 2131 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2132 dest->obj_at_put(0, str()); 2133 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2134 dest->obj_at_put(1, str()); 2135 return (jobjectArray) JNIHandles::make_local(dest()); 2136 } 2137 JVM_END 2138 2139 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2140 { 2141 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2142 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2143 bounds_check(cp, index, CHECK_0); 2144 constantTag tag = cp->tag_at(index); 2145 if (!tag.is_int()) { 2146 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2147 } 2148 return cp->int_at(index); 2149 } 2150 JVM_END 2151 2152 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2153 { 2154 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2155 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2156 bounds_check(cp, index, CHECK_(0L)); 2157 constantTag tag = cp->tag_at(index); 2158 if (!tag.is_long()) { 2159 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2160 } 2161 return cp->long_at(index); 2162 } 2163 JVM_END 2164 2165 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2166 { 2167 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2168 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2169 bounds_check(cp, index, CHECK_(0.0f)); 2170 constantTag tag = cp->tag_at(index); 2171 if (!tag.is_float()) { 2172 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2173 } 2174 return cp->float_at(index); 2175 } 2176 JVM_END 2177 2178 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2179 { 2180 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2181 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2182 bounds_check(cp, index, CHECK_(0.0)); 2183 constantTag tag = cp->tag_at(index); 2184 if (!tag.is_double()) { 2185 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2186 } 2187 return cp->double_at(index); 2188 } 2189 JVM_END 2190 2191 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2192 { 2193 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2194 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2195 bounds_check(cp, index, CHECK_NULL); 2196 constantTag tag = cp->tag_at(index); 2197 if (!tag.is_string()) { 2198 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2199 } 2200 oop str = cp->string_at(index, CHECK_NULL); 2201 return (jstring) JNIHandles::make_local(str); 2202 } 2203 JVM_END 2204 2205 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2206 { 2207 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2208 JvmtiVMObjectAllocEventCollector oam; 2209 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2210 bounds_check(cp, index, CHECK_NULL); 2211 constantTag tag = cp->tag_at(index); 2212 if (!tag.is_symbol()) { 2213 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2214 } 2215 Symbol* sym = cp->symbol_at(index); 2216 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2217 return (jstring) JNIHandles::make_local(str()); 2218 } 2219 JVM_END 2220 2221 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2222 { 2223 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2224 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2225 bounds_check(cp, index, CHECK_0); 2226 constantTag tag = cp->tag_at(index); 2227 jbyte result = tag.value(); 2228 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2229 // they are changed to the corresponding tags from the JVM spec, so that java code in 2230 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2231 if (tag.is_klass_or_reference()) { 2232 result = JVM_CONSTANT_Class; 2233 } else if (tag.is_string_index()) { 2234 result = JVM_CONSTANT_String; 2235 } else if (tag.is_method_type_in_error()) { 2236 result = JVM_CONSTANT_MethodType; 2237 } else if (tag.is_method_handle_in_error()) { 2238 result = JVM_CONSTANT_MethodHandle; 2239 } 2240 return result; 2241 } 2242 JVM_END 2243 2244 // Assertion support. ////////////////////////////////////////////////////////// 2245 2246 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2247 JVMWrapper("JVM_DesiredAssertionStatus"); 2248 assert(cls != NULL, "bad class"); 2249 2250 oop r = JNIHandles::resolve(cls); 2251 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2252 if (java_lang_Class::is_primitive(r)) return false; 2253 2254 Klass* k = java_lang_Class::as_Klass(r); 2255 assert(k->is_instance_klass(), "must be an instance klass"); 2256 if (!k->is_instance_klass()) return false; 2257 2258 ResourceMark rm(THREAD); 2259 const char* name = k->name()->as_C_string(); 2260 bool system_class = k->class_loader() == NULL; 2261 return JavaAssertions::enabled(name, system_class); 2262 2263 JVM_END 2264 2265 2266 // Return a new AssertionStatusDirectives object with the fields filled in with 2267 // command-line assertion arguments (i.e., -ea, -da). 2268 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2269 JVMWrapper("JVM_AssertionStatusDirectives"); 2270 JvmtiVMObjectAllocEventCollector oam; 2271 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2272 return JNIHandles::make_local(env, asd); 2273 JVM_END 2274 2275 // Verification //////////////////////////////////////////////////////////////////////////////// 2276 2277 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2278 2279 // RedefineClasses support: bug 6214132 caused verification to fail. 2280 // All functions from this section should call the jvmtiThreadSate function: 2281 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2282 // The function returns a Klass* of the _scratch_class if the verifier 2283 // was invoked in the middle of the class redefinition. 2284 // Otherwise it returns its argument value which is the _the_class Klass*. 2285 // Please, refer to the description in the jvmtiThreadSate.hpp. 2286 2287 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2288 JVMWrapper("JVM_GetClassNameUTF"); 2289 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2290 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2291 return k->name()->as_utf8(); 2292 JVM_END 2293 2294 2295 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2296 JVMWrapper("JVM_GetClassCPTypes"); 2297 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2298 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2299 // types will have length zero if this is not an InstanceKlass 2300 // (length is determined by call to JVM_GetClassCPEntriesCount) 2301 if (k->is_instance_klass()) { 2302 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2303 for (int index = cp->length() - 1; index >= 0; index--) { 2304 constantTag tag = cp->tag_at(index); 2305 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2306 } 2307 } 2308 JVM_END 2309 2310 2311 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2312 JVMWrapper("JVM_GetClassCPEntriesCount"); 2313 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2314 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2315 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2316 JVM_END 2317 2318 2319 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2320 JVMWrapper("JVM_GetClassFieldsCount"); 2321 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2322 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2323 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2324 JVM_END 2325 2326 2327 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2328 JVMWrapper("JVM_GetClassMethodsCount"); 2329 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2330 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2331 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2332 JVM_END 2333 2334 2335 // The following methods, used for the verifier, are never called with 2336 // array klasses, so a direct cast to InstanceKlass is safe. 2337 // Typically, these methods are called in a loop with bounds determined 2338 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2339 // zero for arrays. 2340 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2341 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2342 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2343 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2344 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2345 int length = method->checked_exceptions_length(); 2346 if (length > 0) { 2347 CheckedExceptionElement* table= method->checked_exceptions_start(); 2348 for (int i = 0; i < length; i++) { 2349 exceptions[i] = table[i].class_cp_index; 2350 } 2351 } 2352 JVM_END 2353 2354 2355 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2356 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2357 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2358 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2359 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2360 return method->checked_exceptions_length(); 2361 JVM_END 2362 2363 2364 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2365 JVMWrapper("JVM_GetMethodIxByteCode"); 2366 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2367 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2368 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2369 memcpy(code, method->code_base(), method->code_size()); 2370 JVM_END 2371 2372 2373 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2374 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2375 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2376 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2377 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2378 return method->code_size(); 2379 JVM_END 2380 2381 2382 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2383 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2384 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2385 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2386 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2387 ExceptionTable extable(method); 2388 entry->start_pc = extable.start_pc(entry_index); 2389 entry->end_pc = extable.end_pc(entry_index); 2390 entry->handler_pc = extable.handler_pc(entry_index); 2391 entry->catchType = extable.catch_type_index(entry_index); 2392 JVM_END 2393 2394 2395 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2396 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2397 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2398 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2399 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2400 return method->exception_table_length(); 2401 JVM_END 2402 2403 2404 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2405 JVMWrapper("JVM_GetMethodIxModifiers"); 2406 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2407 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2408 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2409 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2410 JVM_END 2411 2412 2413 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2414 JVMWrapper("JVM_GetFieldIxModifiers"); 2415 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2416 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2417 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2418 JVM_END 2419 2420 2421 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2422 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2423 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2424 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2425 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2426 return method->max_locals(); 2427 JVM_END 2428 2429 2430 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2431 JVMWrapper("JVM_GetMethodIxArgsSize"); 2432 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2433 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2434 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2435 return method->size_of_parameters(); 2436 JVM_END 2437 2438 2439 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2440 JVMWrapper("JVM_GetMethodIxMaxStack"); 2441 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2442 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2443 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2444 return method->verifier_max_stack(); 2445 JVM_END 2446 2447 2448 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2449 JVMWrapper("JVM_IsConstructorIx"); 2450 ResourceMark rm(THREAD); 2451 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2452 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2453 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2454 return method->name() == vmSymbols::object_initializer_name(); 2455 JVM_END 2456 2457 2458 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2459 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2460 ResourceMark rm(THREAD); 2461 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2462 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2463 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2464 return method->is_overpass(); 2465 JVM_END 2466 2467 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2468 JVMWrapper("JVM_GetMethodIxIxUTF"); 2469 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2470 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2471 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2472 return method->name()->as_utf8(); 2473 JVM_END 2474 2475 2476 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2477 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2478 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2479 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2480 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2481 return method->signature()->as_utf8(); 2482 JVM_END 2483 2484 /** 2485 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2486 * read entries in the constant pool. Since the old verifier always 2487 * works on a copy of the code, it will not see any rewriting that 2488 * may possibly occur in the middle of verification. So it is important 2489 * that nothing it calls tries to use the cpCache instead of the raw 2490 * constant pool, so we must use cp->uncached_x methods when appropriate. 2491 */ 2492 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2493 JVMWrapper("JVM_GetCPFieldNameUTF"); 2494 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2495 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2496 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2497 switch (cp->tag_at(cp_index).value()) { 2498 case JVM_CONSTANT_Fieldref: 2499 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2500 default: 2501 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2502 } 2503 ShouldNotReachHere(); 2504 return NULL; 2505 JVM_END 2506 2507 2508 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2509 JVMWrapper("JVM_GetCPMethodNameUTF"); 2510 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2511 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2512 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2513 switch (cp->tag_at(cp_index).value()) { 2514 case JVM_CONSTANT_InterfaceMethodref: 2515 case JVM_CONSTANT_Methodref: 2516 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2517 default: 2518 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2519 } 2520 ShouldNotReachHere(); 2521 return NULL; 2522 JVM_END 2523 2524 2525 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2526 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2527 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2528 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2529 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2530 switch (cp->tag_at(cp_index).value()) { 2531 case JVM_CONSTANT_InterfaceMethodref: 2532 case JVM_CONSTANT_Methodref: 2533 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2534 default: 2535 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2536 } 2537 ShouldNotReachHere(); 2538 return NULL; 2539 JVM_END 2540 2541 2542 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2543 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2544 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2545 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2546 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2547 switch (cp->tag_at(cp_index).value()) { 2548 case JVM_CONSTANT_Fieldref: 2549 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2550 default: 2551 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2552 } 2553 ShouldNotReachHere(); 2554 return NULL; 2555 JVM_END 2556 2557 2558 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2559 JVMWrapper("JVM_GetCPClassNameUTF"); 2560 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2561 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2562 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2563 Symbol* classname = cp->klass_name_at(cp_index); 2564 return classname->as_utf8(); 2565 JVM_END 2566 2567 2568 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2569 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2570 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2571 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2572 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2573 switch (cp->tag_at(cp_index).value()) { 2574 case JVM_CONSTANT_Fieldref: { 2575 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2576 Symbol* classname = cp->klass_name_at(class_index); 2577 return classname->as_utf8(); 2578 } 2579 default: 2580 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2581 } 2582 ShouldNotReachHere(); 2583 return NULL; 2584 JVM_END 2585 2586 2587 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2588 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2589 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2590 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2591 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2592 switch (cp->tag_at(cp_index).value()) { 2593 case JVM_CONSTANT_Methodref: 2594 case JVM_CONSTANT_InterfaceMethodref: { 2595 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2596 Symbol* classname = cp->klass_name_at(class_index); 2597 return classname->as_utf8(); 2598 } 2599 default: 2600 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2601 } 2602 ShouldNotReachHere(); 2603 return NULL; 2604 JVM_END 2605 2606 2607 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2608 JVMWrapper("JVM_GetCPFieldModifiers"); 2609 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2610 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2611 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2612 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2613 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2614 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2615 switch (cp->tag_at(cp_index).value()) { 2616 case JVM_CONSTANT_Fieldref: { 2617 Symbol* name = cp->uncached_name_ref_at(cp_index); 2618 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2619 InstanceKlass* ik = InstanceKlass::cast(k_called); 2620 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2621 if (fs.name() == name && fs.signature() == signature) { 2622 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2623 } 2624 } 2625 return -1; 2626 } 2627 default: 2628 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2629 } 2630 ShouldNotReachHere(); 2631 return 0; 2632 JVM_END 2633 2634 2635 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2636 JVMWrapper("JVM_GetCPMethodModifiers"); 2637 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2638 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2639 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2640 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2641 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2642 switch (cp->tag_at(cp_index).value()) { 2643 case JVM_CONSTANT_Methodref: 2644 case JVM_CONSTANT_InterfaceMethodref: { 2645 Symbol* name = cp->uncached_name_ref_at(cp_index); 2646 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2647 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2648 int methods_count = methods->length(); 2649 for (int i = 0; i < methods_count; i++) { 2650 Method* method = methods->at(i); 2651 if (method->name() == name && method->signature() == signature) { 2652 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2653 } 2654 } 2655 return -1; 2656 } 2657 default: 2658 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2659 } 2660 ShouldNotReachHere(); 2661 return 0; 2662 JVM_END 2663 2664 2665 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2666 2667 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2668 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2669 JVM_END 2670 2671 2672 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2673 JVMWrapper("JVM_IsSameClassPackage"); 2674 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2675 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2676 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2677 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2678 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2679 JVM_END 2680 2681 // Printing support ////////////////////////////////////////////////// 2682 extern "C" { 2683 2684 ATTRIBUTE_PRINTF(3, 0) 2685 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2686 // see bug 4399518, 4417214 2687 if ((intptr_t)count <= 0) return -1; 2688 2689 int result = vsnprintf(str, count, fmt, args); 2690 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2691 // characters which would have been written had the buffer been large 2692 // enough; on Windows, it returns -1. We handle both cases here and 2693 // always return -1, and perform null termination. 2694 if ((result > 0 && (size_t)result >= count) || result == -1) { 2695 str[count - 1] = '\0'; 2696 result = -1; 2697 } 2698 2699 return result; 2700 } 2701 2702 ATTRIBUTE_PRINTF(3, 0) 2703 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2704 va_list args; 2705 int len; 2706 va_start(args, fmt); 2707 len = jio_vsnprintf(str, count, fmt, args); 2708 va_end(args); 2709 return len; 2710 } 2711 2712 ATTRIBUTE_PRINTF(2,3) 2713 int jio_fprintf(FILE* f, const char *fmt, ...) { 2714 int len; 2715 va_list args; 2716 va_start(args, fmt); 2717 len = jio_vfprintf(f, fmt, args); 2718 va_end(args); 2719 return len; 2720 } 2721 2722 ATTRIBUTE_PRINTF(2, 0) 2723 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2724 if (Arguments::vfprintf_hook() != NULL) { 2725 return Arguments::vfprintf_hook()(f, fmt, args); 2726 } else { 2727 return vfprintf(f, fmt, args); 2728 } 2729 } 2730 2731 ATTRIBUTE_PRINTF(1, 2) 2732 JNIEXPORT int jio_printf(const char *fmt, ...) { 2733 int len; 2734 va_list args; 2735 va_start(args, fmt); 2736 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2737 va_end(args); 2738 return len; 2739 } 2740 2741 2742 // HotSpot specific jio method 2743 void jio_print(const char* s) { 2744 // Try to make this function as atomic as possible. 2745 if (Arguments::vfprintf_hook() != NULL) { 2746 jio_fprintf(defaultStream::output_stream(), "%s", s); 2747 } else { 2748 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2749 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2750 } 2751 } 2752 2753 } // Extern C 2754 2755 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2756 2757 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 2758 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or 2759 // OSThread objects. The exception to this rule is when the target object is the thread 2760 // doing the operation, in which case we know that the thread won't exit until the 2761 // operation is done (all exits being voluntary). There are a few cases where it is 2762 // rather silly to do operations on yourself, like resuming yourself or asking whether 2763 // you are alive. While these can still happen, they are not subject to deadlocks if 2764 // the lock is held while the operation occurs (this is not the case for suspend, for 2765 // instance), and are very unlikely. Because IsAlive needs to be fast and its 2766 // implementation is local to this file, we always lock Threads_lock for that one. 2767 2768 static void thread_entry(JavaThread* thread, TRAPS) { 2769 HandleMark hm(THREAD); 2770 Handle obj(THREAD, thread->threadObj()); 2771 JavaValue result(T_VOID); 2772 JavaCalls::call_virtual(&result, 2773 obj, 2774 SystemDictionary::Thread_klass(), 2775 vmSymbols::run_method_name(), 2776 vmSymbols::void_method_signature(), 2777 THREAD); 2778 } 2779 2780 2781 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2782 JVMWrapper("JVM_StartThread"); 2783 JavaThread *native_thread = NULL; 2784 2785 // We cannot hold the Threads_lock when we throw an exception, 2786 // due to rank ordering issues. Example: we might need to grab the 2787 // Heap_lock while we construct the exception. 2788 bool throw_illegal_thread_state = false; 2789 2790 // We must release the Threads_lock before we can post a jvmti event 2791 // in Thread::start. 2792 { 2793 // Ensure that the C++ Thread and OSThread structures aren't freed before 2794 // we operate. 2795 MutexLocker mu(Threads_lock); 2796 2797 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2798 // re-starting an already started thread, so we should usually find 2799 // that the JavaThread is null. However for a JNI attached thread 2800 // there is a small window between the Thread object being created 2801 // (with its JavaThread set) and the update to its threadStatus, so we 2802 // have to check for this 2803 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2804 throw_illegal_thread_state = true; 2805 } else { 2806 // We could also check the stillborn flag to see if this thread was already stopped, but 2807 // for historical reasons we let the thread detect that itself when it starts running 2808 2809 jlong size = 2810 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2811 // Allocate the C++ Thread structure and create the native thread. The 2812 // stack size retrieved from java is 64-bit signed, but the constructor takes 2813 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2814 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2815 // - Avoid passing negative values which would result in really large stacks. 2816 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2817 size_t sz = size > 0 ? (size_t) size : 0; 2818 native_thread = new JavaThread(&thread_entry, sz); 2819 2820 // At this point it may be possible that no osthread was created for the 2821 // JavaThread due to lack of memory. Check for this situation and throw 2822 // an exception if necessary. Eventually we may want to change this so 2823 // that we only grab the lock if the thread was created successfully - 2824 // then we can also do this check and throw the exception in the 2825 // JavaThread constructor. 2826 if (native_thread->osthread() != NULL) { 2827 // Note: the current thread is not being used within "prepare". 2828 native_thread->prepare(jthread); 2829 } 2830 } 2831 } 2832 2833 if (throw_illegal_thread_state) { 2834 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2835 } 2836 2837 assert(native_thread != NULL, "Starting null thread?"); 2838 2839 if (native_thread->osthread() == NULL) { 2840 // No one should hold a reference to the 'native_thread'. 2841 delete native_thread; 2842 if (JvmtiExport::should_post_resource_exhausted()) { 2843 JvmtiExport::post_resource_exhausted( 2844 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2845 os::native_thread_creation_failed_msg()); 2846 } 2847 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2848 os::native_thread_creation_failed_msg()); 2849 } 2850 2851 Thread::start(native_thread); 2852 2853 JVM_END 2854 2855 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2856 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2857 // but is thought to be reliable and simple. In the case, where the receiver is the 2858 // same thread as the sender, no safepoint is needed. 2859 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2860 JVMWrapper("JVM_StopThread"); 2861 2862 oop java_throwable = JNIHandles::resolve(throwable); 2863 if (java_throwable == NULL) { 2864 THROW(vmSymbols::java_lang_NullPointerException()); 2865 } 2866 oop java_thread = JNIHandles::resolve_non_null(jthread); 2867 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2868 Events::log_exception(JavaThread::current(), 2869 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2870 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2871 // First check if thread is alive 2872 if (receiver != NULL) { 2873 // Check if exception is getting thrown at self (use oop equality, since the 2874 // target object might exit) 2875 if (java_thread == thread->threadObj()) { 2876 THROW_OOP(java_throwable); 2877 } else { 2878 // Enques a VM_Operation to stop all threads and then deliver the exception... 2879 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 2880 } 2881 } 2882 else { 2883 // Either: 2884 // - target thread has not been started before being stopped, or 2885 // - target thread already terminated 2886 // We could read the threadStatus to determine which case it is 2887 // but that is overkill as it doesn't matter. We must set the 2888 // stillborn flag for the first case, and if the thread has already 2889 // exited setting this flag has no affect 2890 java_lang_Thread::set_stillborn(java_thread); 2891 } 2892 JVM_END 2893 2894 2895 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2896 JVMWrapper("JVM_IsThreadAlive"); 2897 2898 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2899 return java_lang_Thread::is_alive(thread_oop); 2900 JVM_END 2901 2902 2903 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2904 JVMWrapper("JVM_SuspendThread"); 2905 oop java_thread = JNIHandles::resolve_non_null(jthread); 2906 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2907 2908 if (receiver != NULL) { 2909 // thread has run and has not exited (still on threads list) 2910 2911 { 2912 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2913 if (receiver->is_external_suspend()) { 2914 // Don't allow nested external suspend requests. We can't return 2915 // an error from this interface so just ignore the problem. 2916 return; 2917 } 2918 if (receiver->is_exiting()) { // thread is in the process of exiting 2919 return; 2920 } 2921 receiver->set_external_suspend(); 2922 } 2923 2924 // java_suspend() will catch threads in the process of exiting 2925 // and will ignore them. 2926 receiver->java_suspend(); 2927 2928 // It would be nice to have the following assertion in all the 2929 // time, but it is possible for a racing resume request to have 2930 // resumed this thread right after we suspended it. Temporarily 2931 // enable this assertion if you are chasing a different kind of 2932 // bug. 2933 // 2934 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2935 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2936 } 2937 JVM_END 2938 2939 2940 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2941 JVMWrapper("JVM_ResumeThread"); 2942 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 2943 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2944 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2945 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2946 // looks at it. 2947 MutexLocker ml(Threads_lock); 2948 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2949 if (thr != NULL) { 2950 // the thread has run and is not in the process of exiting 2951 thr->java_resume(); 2952 } 2953 JVM_END 2954 2955 2956 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2957 JVMWrapper("JVM_SetThreadPriority"); 2958 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2959 MutexLocker ml(Threads_lock); 2960 oop java_thread = JNIHandles::resolve_non_null(jthread); 2961 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2962 JavaThread* thr = java_lang_Thread::thread(java_thread); 2963 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 2964 Thread::set_priority(thr, (ThreadPriority)prio); 2965 } 2966 JVM_END 2967 2968 2969 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2970 JVMWrapper("JVM_Yield"); 2971 if (os::dont_yield()) return; 2972 HOTSPOT_THREAD_YIELD(); 2973 os::naked_yield(); 2974 JVM_END 2975 2976 2977 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2978 JVMWrapper("JVM_Sleep"); 2979 2980 if (millis < 0) { 2981 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2982 } 2983 2984 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2985 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2986 } 2987 2988 // Save current thread state and restore it at the end of this block. 2989 // And set new thread state to SLEEPING. 2990 JavaThreadSleepState jtss(thread); 2991 2992 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 2993 2994 EventThreadSleep event; 2995 2996 if (millis == 0) { 2997 os::naked_yield(); 2998 } else { 2999 ThreadState old_state = thread->osthread()->get_state(); 3000 thread->osthread()->set_state(SLEEPING); 3001 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3002 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3003 // us while we were sleeping. We do not overwrite those. 3004 if (!HAS_PENDING_EXCEPTION) { 3005 if (event.should_commit()) { 3006 event.set_time(millis); 3007 event.commit(); 3008 } 3009 HOTSPOT_THREAD_SLEEP_END(1); 3010 3011 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3012 // to properly restore the thread state. That's likely wrong. 3013 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3014 } 3015 } 3016 thread->osthread()->set_state(old_state); 3017 } 3018 if (event.should_commit()) { 3019 event.set_time(millis); 3020 event.commit(); 3021 } 3022 HOTSPOT_THREAD_SLEEP_END(0); 3023 JVM_END 3024 3025 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3026 JVMWrapper("JVM_CurrentThread"); 3027 oop jthread = thread->threadObj(); 3028 assert (thread != NULL, "no current thread!"); 3029 return JNIHandles::make_local(env, jthread); 3030 JVM_END 3031 3032 3033 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3034 JVMWrapper("JVM_CountStackFrames"); 3035 3036 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3037 oop java_thread = JNIHandles::resolve_non_null(jthread); 3038 bool throw_illegal_thread_state = false; 3039 int count = 0; 3040 3041 { 3042 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3043 // We need to re-resolve the java_thread, since a GC might have happened during the 3044 // acquire of the lock 3045 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3046 3047 if (thr == NULL) { 3048 // do nothing 3049 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 3050 // Check whether this java thread has been suspended already. If not, throws 3051 // IllegalThreadStateException. We defer to throw that exception until 3052 // Threads_lock is released since loading exception class has to leave VM. 3053 // The correct way to test a thread is actually suspended is 3054 // wait_for_ext_suspend_completion(), but we can't call that while holding 3055 // the Threads_lock. The above tests are sufficient for our purposes 3056 // provided the walkability of the stack is stable - which it isn't 3057 // 100% but close enough for most practical purposes. 3058 throw_illegal_thread_state = true; 3059 } else { 3060 // Count all java activation, i.e., number of vframes 3061 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 3062 // Native frames are not counted 3063 if (!vfst.method()->is_native()) count++; 3064 } 3065 } 3066 } 3067 3068 if (throw_illegal_thread_state) { 3069 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3070 "this thread is not suspended"); 3071 } 3072 return count; 3073 JVM_END 3074 3075 // Consider: A better way to implement JVM_Interrupt() is to acquire 3076 // Threads_lock to resolve the jthread into a Thread pointer, fetch 3077 // Thread->platformevent, Thread->native_thr, Thread->parker, etc., 3078 // drop Threads_lock, and the perform the unpark() and thr_kill() operations 3079 // outside the critical section. Threads_lock is hot so we want to minimize 3080 // the hold-time. A cleaner interface would be to decompose interrupt into 3081 // two steps. The 1st phase, performed under Threads_lock, would return 3082 // a closure that'd be invoked after Threads_lock was dropped. 3083 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 3084 // admit spurious wakeups. 3085 3086 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3087 JVMWrapper("JVM_Interrupt"); 3088 3089 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3090 oop java_thread = JNIHandles::resolve_non_null(jthread); 3091 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3092 // We need to re-resolve the java_thread, since a GC might have happened during the 3093 // acquire of the lock 3094 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3095 if (thr != NULL) { 3096 Thread::interrupt(thr); 3097 } 3098 JVM_END 3099 3100 3101 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3102 JVMWrapper("JVM_IsInterrupted"); 3103 3104 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3105 oop java_thread = JNIHandles::resolve_non_null(jthread); 3106 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3107 // We need to re-resolve the java_thread, since a GC might have happened during the 3108 // acquire of the lock 3109 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3110 if (thr == NULL) { 3111 return JNI_FALSE; 3112 } else { 3113 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3114 } 3115 JVM_END 3116 3117 3118 // Return true iff the current thread has locked the object passed in 3119 3120 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3121 JVMWrapper("JVM_HoldsLock"); 3122 assert(THREAD->is_Java_thread(), "sanity check"); 3123 if (obj == NULL) { 3124 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3125 } 3126 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3127 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3128 JVM_END 3129 3130 3131 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3132 JVMWrapper("JVM_DumpAllStacks"); 3133 VM_PrintThreads op; 3134 VMThread::execute(&op); 3135 if (JvmtiExport::should_post_data_dump()) { 3136 JvmtiExport::post_data_dump(); 3137 } 3138 JVM_END 3139 3140 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3141 JVMWrapper("JVM_SetNativeThreadName"); 3142 ResourceMark rm(THREAD); 3143 oop java_thread = JNIHandles::resolve_non_null(jthread); 3144 JavaThread* thr = java_lang_Thread::thread(java_thread); 3145 // Thread naming only supported for the current thread, doesn't work for 3146 // target threads. 3147 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3148 // we don't set the name of an attached thread to avoid stepping 3149 // on other programs 3150 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3151 os::set_native_thread_name(thread_name); 3152 } 3153 JVM_END 3154 3155 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3156 3157 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3158 assert(jthread->is_Java_thread(), "must be a Java thread"); 3159 if (jthread->privileged_stack_top() == NULL) return false; 3160 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3161 oop loader = jthread->privileged_stack_top()->class_loader(); 3162 if (loader == NULL) return true; 3163 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3164 if (trusted) return true; 3165 } 3166 return false; 3167 } 3168 3169 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3170 JVMWrapper("JVM_CurrentLoadedClass"); 3171 ResourceMark rm(THREAD); 3172 3173 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3174 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3175 bool trusted = is_trusted_frame(thread, &vfst); 3176 if (trusted) return NULL; 3177 3178 Method* m = vfst.method(); 3179 if (!m->is_native()) { 3180 InstanceKlass* holder = m->method_holder(); 3181 oop loader = holder->class_loader(); 3182 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3183 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3184 } 3185 } 3186 } 3187 return NULL; 3188 JVM_END 3189 3190 3191 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3192 JVMWrapper("JVM_CurrentClassLoader"); 3193 ResourceMark rm(THREAD); 3194 3195 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3196 3197 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3198 bool trusted = is_trusted_frame(thread, &vfst); 3199 if (trusted) return NULL; 3200 3201 Method* m = vfst.method(); 3202 if (!m->is_native()) { 3203 InstanceKlass* holder = m->method_holder(); 3204 assert(holder->is_klass(), "just checking"); 3205 oop loader = holder->class_loader(); 3206 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3207 return JNIHandles::make_local(env, loader); 3208 } 3209 } 3210 } 3211 return NULL; 3212 JVM_END 3213 3214 3215 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3216 JVMWrapper("JVM_GetClassContext"); 3217 ResourceMark rm(THREAD); 3218 JvmtiVMObjectAllocEventCollector oam; 3219 vframeStream vfst(thread); 3220 3221 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3222 // This must only be called from SecurityManager.getClassContext 3223 Method* m = vfst.method(); 3224 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3225 m->name() == vmSymbols::getClassContext_name() && 3226 m->signature() == vmSymbols::void_class_array_signature())) { 3227 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3228 } 3229 } 3230 3231 // Collect method holders 3232 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3233 for (; !vfst.at_end(); vfst.security_next()) { 3234 Method* m = vfst.method(); 3235 // Native frames are not returned 3236 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3237 Klass* holder = m->method_holder(); 3238 assert(holder->is_klass(), "just checking"); 3239 klass_array->append(holder); 3240 } 3241 } 3242 3243 // Create result array of type [Ljava/lang/Class; 3244 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3245 // Fill in mirrors corresponding to method holders 3246 for (int i = 0; i < klass_array->length(); i++) { 3247 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3248 } 3249 3250 return (jobjectArray) JNIHandles::make_local(env, result); 3251 JVM_END 3252 3253 3254 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3255 JVMWrapper("JVM_ClassDepth"); 3256 ResourceMark rm(THREAD); 3257 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3258 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3259 3260 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3261 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3262 if (class_name_sym == NULL) { 3263 return -1; 3264 } 3265 3266 int depth = 0; 3267 3268 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3269 if (!vfst.method()->is_native()) { 3270 InstanceKlass* holder = vfst.method()->method_holder(); 3271 assert(holder->is_klass(), "just checking"); 3272 if (holder->name() == class_name_sym) { 3273 return depth; 3274 } 3275 depth++; 3276 } 3277 } 3278 return -1; 3279 JVM_END 3280 3281 3282 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3283 JVMWrapper("JVM_ClassLoaderDepth"); 3284 ResourceMark rm(THREAD); 3285 int depth = 0; 3286 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3287 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3288 bool trusted = is_trusted_frame(thread, &vfst); 3289 if (trusted) return -1; 3290 3291 Method* m = vfst.method(); 3292 if (!m->is_native()) { 3293 InstanceKlass* holder = m->method_holder(); 3294 assert(holder->is_klass(), "just checking"); 3295 oop loader = holder->class_loader(); 3296 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3297 return depth; 3298 } 3299 depth++; 3300 } 3301 } 3302 return -1; 3303 JVM_END 3304 3305 3306 // java.lang.Package //////////////////////////////////////////////////////////////// 3307 3308 3309 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3310 JVMWrapper("JVM_GetSystemPackage"); 3311 ResourceMark rm(THREAD); 3312 JvmtiVMObjectAllocEventCollector oam; 3313 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3314 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3315 return (jstring) JNIHandles::make_local(result); 3316 JVM_END 3317 3318 3319 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3320 JVMWrapper("JVM_GetSystemPackages"); 3321 JvmtiVMObjectAllocEventCollector oam; 3322 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3323 return (jobjectArray) JNIHandles::make_local(result); 3324 JVM_END 3325 3326 3327 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3328 3329 3330 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3331 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3332 3333 MonitorLockerEx ml(Heap_lock); 3334 oop ref = Universe::reference_pending_list(); 3335 if (ref != NULL) { 3336 Universe::set_reference_pending_list(NULL); 3337 } 3338 return JNIHandles::make_local(env, ref); 3339 JVM_END 3340 3341 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3342 JVMWrapper("JVM_HasReferencePendingList"); 3343 MonitorLockerEx ml(Heap_lock); 3344 return Universe::has_reference_pending_list(); 3345 JVM_END 3346 3347 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3348 JVMWrapper("JVM_WaitForReferencePendingList"); 3349 MonitorLockerEx ml(Heap_lock); 3350 while (!Universe::has_reference_pending_list()) { 3351 ml.wait(); 3352 } 3353 JVM_END 3354 3355 3356 // ObjectInputStream /////////////////////////////////////////////////////////////// 3357 3358 // Return the first user-defined class loader up the execution stack, or null 3359 // if only code from the bootstrap or platform class loader is on the stack. 3360 3361 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3362 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3363 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3364 oop loader = vfst.method()->method_holder()->class_loader(); 3365 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3366 return JNIHandles::make_local(env, loader); 3367 } 3368 } 3369 return NULL; 3370 JVM_END 3371 3372 3373 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3374 3375 3376 // resolve array handle and check arguments 3377 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3378 if (arr == NULL) { 3379 THROW_0(vmSymbols::java_lang_NullPointerException()); 3380 } 3381 oop a = JNIHandles::resolve_non_null(arr); 3382 if (!a->is_array()) { 3383 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3384 } else if (type_array_only && !a->is_typeArray()) { 3385 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3386 } 3387 return arrayOop(a); 3388 } 3389 3390 3391 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3392 JVMWrapper("JVM_GetArrayLength"); 3393 arrayOop a = check_array(env, arr, false, CHECK_0); 3394 return a->length(); 3395 JVM_END 3396 3397 3398 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3399 JVMWrapper("JVM_Array_Get"); 3400 JvmtiVMObjectAllocEventCollector oam; 3401 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3402 jvalue value; 3403 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3404 oop box = Reflection::box(&value, type, CHECK_NULL); 3405 return JNIHandles::make_local(env, box); 3406 JVM_END 3407 3408 3409 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3410 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3411 jvalue value; 3412 value.i = 0; // to initialize value before getting used in CHECK 3413 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3414 assert(a->is_typeArray(), "just checking"); 3415 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3416 BasicType wide_type = (BasicType) wCode; 3417 if (type != wide_type) { 3418 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3419 } 3420 return value; 3421 JVM_END 3422 3423 3424 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3425 JVMWrapper("JVM_SetArrayElement"); 3426 arrayOop a = check_array(env, arr, false, CHECK); 3427 oop box = JNIHandles::resolve(val); 3428 jvalue value; 3429 value.i = 0; // to initialize value before getting used in CHECK 3430 BasicType value_type; 3431 if (a->is_objArray()) { 3432 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3433 value_type = Reflection::unbox_for_regular_object(box, &value); 3434 } else { 3435 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3436 } 3437 Reflection::array_set(&value, a, index, value_type, CHECK); 3438 JVM_END 3439 3440 3441 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3442 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3443 arrayOop a = check_array(env, arr, true, CHECK); 3444 assert(a->is_typeArray(), "just checking"); 3445 BasicType value_type = (BasicType) vCode; 3446 Reflection::array_set(&v, a, index, value_type, CHECK); 3447 JVM_END 3448 3449 3450 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3451 JVMWrapper("JVM_NewArray"); 3452 JvmtiVMObjectAllocEventCollector oam; 3453 oop element_mirror = JNIHandles::resolve(eltClass); 3454 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3455 return JNIHandles::make_local(env, result); 3456 JVM_END 3457 3458 3459 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3460 JVMWrapper("JVM_NewMultiArray"); 3461 JvmtiVMObjectAllocEventCollector oam; 3462 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3463 oop element_mirror = JNIHandles::resolve(eltClass); 3464 assert(dim_array->is_typeArray(), "just checking"); 3465 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3466 return JNIHandles::make_local(env, result); 3467 JVM_END 3468 3469 3470 // Library support /////////////////////////////////////////////////////////////////////////// 3471 3472 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3473 //%note jvm_ct 3474 JVMWrapper("JVM_LoadLibrary"); 3475 char ebuf[1024]; 3476 void *load_result; 3477 { 3478 ThreadToNativeFromVM ttnfvm(thread); 3479 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3480 } 3481 if (load_result == NULL) { 3482 char msg[1024]; 3483 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3484 // Since 'ebuf' may contain a string encoded using 3485 // platform encoding scheme, we need to pass 3486 // Exceptions::unsafe_to_utf8 to the new_exception method 3487 // as the last argument. See bug 6367357. 3488 Handle h_exception = 3489 Exceptions::new_exception(thread, 3490 vmSymbols::java_lang_UnsatisfiedLinkError(), 3491 msg, Exceptions::unsafe_to_utf8); 3492 3493 THROW_HANDLE_0(h_exception); 3494 } 3495 return load_result; 3496 JVM_END 3497 3498 3499 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3500 JVMWrapper("JVM_UnloadLibrary"); 3501 os::dll_unload(handle); 3502 JVM_END 3503 3504 3505 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3506 JVMWrapper("JVM_FindLibraryEntry"); 3507 return os::dll_lookup(handle, name); 3508 JVM_END 3509 3510 3511 // JNI version /////////////////////////////////////////////////////////////////////////////// 3512 3513 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3514 JVMWrapper("JVM_IsSupportedJNIVersion"); 3515 return Threads::is_supported_jni_version_including_1_1(version); 3516 JVM_END 3517 3518 3519 // String support /////////////////////////////////////////////////////////////////////////// 3520 3521 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3522 JVMWrapper("JVM_InternString"); 3523 JvmtiVMObjectAllocEventCollector oam; 3524 if (str == NULL) return NULL; 3525 oop string = JNIHandles::resolve_non_null(str); 3526 oop result = StringTable::intern(string, CHECK_NULL); 3527 return (jstring) JNIHandles::make_local(env, result); 3528 JVM_END 3529 3530 3531 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3532 3533 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3534 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3535 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3536 // that only works with java threads. 3537 3538 3539 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3540 VM_Exit::block_if_vm_exited(); 3541 JVMWrapper("JVM_RawMonitorCreate"); 3542 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3543 } 3544 3545 3546 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3547 VM_Exit::block_if_vm_exited(); 3548 JVMWrapper("JVM_RawMonitorDestroy"); 3549 delete ((Mutex*) mon); 3550 } 3551 3552 3553 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3554 VM_Exit::block_if_vm_exited(); 3555 JVMWrapper("JVM_RawMonitorEnter"); 3556 ((Mutex*) mon)->jvm_raw_lock(); 3557 return 0; 3558 } 3559 3560 3561 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3562 VM_Exit::block_if_vm_exited(); 3563 JVMWrapper("JVM_RawMonitorExit"); 3564 ((Mutex*) mon)->jvm_raw_unlock(); 3565 } 3566 3567 3568 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3569 3570 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3571 Handle loader, Handle protection_domain, 3572 jboolean throwError, TRAPS) { 3573 // Security Note: 3574 // The Java level wrapper will perform the necessary security check allowing 3575 // us to pass the NULL as the initiating class loader. The VM is responsible for 3576 // the checkPackageAccess relative to the initiating class loader via the 3577 // protection_domain. The protection_domain is passed as NULL by the java code 3578 // if there is no security manager in 3-arg Class.forName(). 3579 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3580 3581 // Check if we should initialize the class 3582 if (init && klass->is_instance_klass()) { 3583 klass->initialize(CHECK_NULL); 3584 } 3585 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3586 } 3587 3588 3589 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3590 3591 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3592 JVMWrapper("JVM_InvokeMethod"); 3593 Handle method_handle; 3594 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3595 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3596 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3597 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3598 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3599 jobject res = JNIHandles::make_local(env, result); 3600 if (JvmtiExport::should_post_vm_object_alloc()) { 3601 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3602 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3603 if (java_lang_Class::is_primitive(ret_type)) { 3604 // Only for primitive type vm allocates memory for java object. 3605 // See box() method. 3606 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3607 } 3608 } 3609 return res; 3610 } else { 3611 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3612 } 3613 JVM_END 3614 3615 3616 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3617 JVMWrapper("JVM_NewInstanceFromConstructor"); 3618 oop constructor_mirror = JNIHandles::resolve(c); 3619 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3620 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3621 jobject res = JNIHandles::make_local(env, result); 3622 if (JvmtiExport::should_post_vm_object_alloc()) { 3623 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3624 } 3625 return res; 3626 JVM_END 3627 3628 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3629 3630 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3631 JVMWrapper("JVM_SupportsCX8"); 3632 return VM_Version::supports_cx8(); 3633 JVM_END 3634 3635 // Returns an array of all live Thread objects (VM internal JavaThreads, 3636 // jvmti agent threads, and JNI attaching threads are skipped) 3637 // See CR 6404306 regarding JNI attaching threads 3638 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3639 ResourceMark rm(THREAD); 3640 ThreadsListEnumerator tle(THREAD, false, false); 3641 JvmtiVMObjectAllocEventCollector oam; 3642 3643 int num_threads = tle.num_threads(); 3644 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3645 objArrayHandle threads_ah(THREAD, r); 3646 3647 for (int i = 0; i < num_threads; i++) { 3648 Handle h = tle.get_threadObj(i); 3649 threads_ah->obj_at_put(i, h()); 3650 } 3651 3652 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3653 JVM_END 3654 3655 3656 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3657 // Return StackTraceElement[][], each element is the stack trace of a thread in 3658 // the corresponding entry in the given threads array 3659 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3660 JVMWrapper("JVM_DumpThreads"); 3661 JvmtiVMObjectAllocEventCollector oam; 3662 3663 // Check if threads is null 3664 if (threads == NULL) { 3665 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3666 } 3667 3668 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3669 objArrayHandle ah(THREAD, a); 3670 int num_threads = ah->length(); 3671 // check if threads is non-empty array 3672 if (num_threads == 0) { 3673 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3674 } 3675 3676 // check if threads is not an array of objects of Thread class 3677 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3678 if (k != SystemDictionary::Thread_klass()) { 3679 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3680 } 3681 3682 ResourceMark rm(THREAD); 3683 3684 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3685 for (int i = 0; i < num_threads; i++) { 3686 oop thread_obj = ah->obj_at(i); 3687 instanceHandle h(THREAD, (instanceOop) thread_obj); 3688 thread_handle_array->append(h); 3689 } 3690 3691 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3692 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3693 3694 JVM_END 3695 3696 // JVM monitoring and management support 3697 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3698 return Management::get_jmm_interface(version); 3699 JVM_END 3700 3701 // com.sun.tools.attach.VirtualMachine agent properties support 3702 // 3703 // Initialize the agent properties with the properties maintained in the VM 3704 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3705 JVMWrapper("JVM_InitAgentProperties"); 3706 ResourceMark rm; 3707 3708 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3709 3710 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3711 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3712 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3713 return properties; 3714 JVM_END 3715 3716 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3717 { 3718 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3719 JvmtiVMObjectAllocEventCollector oam; 3720 3721 if (ofClass == NULL) { 3722 return NULL; 3723 } 3724 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3725 // Special handling for primitive objects 3726 if (java_lang_Class::is_primitive(mirror())) { 3727 return NULL; 3728 } 3729 Klass* k = java_lang_Class::as_Klass(mirror()); 3730 if (!k->is_instance_klass()) { 3731 return NULL; 3732 } 3733 InstanceKlass* ik = InstanceKlass::cast(k); 3734 int encl_method_class_idx = ik->enclosing_method_class_index(); 3735 if (encl_method_class_idx == 0) { 3736 return NULL; 3737 } 3738 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3739 objArrayHandle dest(THREAD, dest_o); 3740 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3741 dest->obj_at_put(0, enc_k->java_mirror()); 3742 int encl_method_method_idx = ik->enclosing_method_method_index(); 3743 if (encl_method_method_idx != 0) { 3744 Symbol* sym = ik->constants()->symbol_at( 3745 extract_low_short_from_int( 3746 ik->constants()->name_and_type_at(encl_method_method_idx))); 3747 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3748 dest->obj_at_put(1, str()); 3749 sym = ik->constants()->symbol_at( 3750 extract_high_short_from_int( 3751 ik->constants()->name_and_type_at(encl_method_method_idx))); 3752 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3753 dest->obj_at_put(2, str()); 3754 } 3755 return (jobjectArray) JNIHandles::make_local(dest()); 3756 } 3757 JVM_END 3758 3759 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3760 { 3761 memset(info, 0, info_size); 3762 3763 info->jvm_version = Abstract_VM_Version::jvm_version(); 3764 info->patch_version = Abstract_VM_Version::vm_patch_version(); 3765 3766 // when we add a new capability in the jvm_version_info struct, we should also 3767 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3768 // counter defined in runtimeService.cpp. 3769 info->is_attachable = AttachListener::is_attach_supported(); 3770 } 3771 JVM_END 3772 3773 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3774 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3775 ResourceMark rm(THREAD); 3776 3777 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3778 return NULL; 3779 } 3780 3781 char** vm_flags = Arguments::jvm_flags_array(); 3782 char** vm_args = Arguments::jvm_args_array(); 3783 int num_flags = Arguments::num_jvm_flags(); 3784 int num_args = Arguments::num_jvm_args(); 3785 3786 InstanceKlass* ik = SystemDictionary::String_klass(); 3787 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3788 objArrayHandle result_h(THREAD, r); 3789 3790 int index = 0; 3791 for (int j = 0; j < num_flags; j++, index++) { 3792 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3793 result_h->obj_at_put(index, h()); 3794 } 3795 for (int i = 0; i < num_args; i++, index++) { 3796 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3797 result_h->obj_at_put(index, h()); 3798 } 3799 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3800 JVM_END 3801 3802 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3803 return os::get_signal_number(name); 3804 JVM_END