1 /* 2 * Copyright (c) 1997, 2018, 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 "jvm.h" 27 #include "classfile/classFileStream.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/javaAssertions.hpp" 31 #include "classfile/javaClasses.inline.hpp" 32 #include "classfile/moduleEntry.hpp" 33 #include "classfile/modules.hpp" 34 #include "classfile/packageEntry.hpp" 35 #include "classfile/stringTable.hpp" 36 #include "classfile/systemDictionary.hpp" 37 #include "classfile/vmSymbols.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/access.inline.hpp" 44 #include "oops/fieldStreams.hpp" 45 #include "oops/instanceKlass.hpp" 46 #include "oops/method.hpp" 47 #include "oops/objArrayKlass.hpp" 48 #include "oops/objArrayOop.inline.hpp" 49 #include "oops/oop.inline.hpp" 50 #include "oops/valueArrayKlass.hpp" 51 #include "prims/jvm_misc.hpp" 52 #include "prims/jvmtiExport.hpp" 53 #include "prims/jvmtiThreadState.hpp" 54 #include "prims/nativeLookup.hpp" 55 #include "prims/privilegedStack.hpp" 56 #include "prims/stackwalk.hpp" 57 #include "runtime/arguments.hpp" 58 #include "runtime/atomic.hpp" 59 #include "runtime/handles.inline.hpp" 60 #include "runtime/init.hpp" 61 #include "runtime/interfaceSupport.hpp" 62 #include "runtime/java.hpp" 63 #include "runtime/javaCalls.hpp" 64 #include "runtime/jfieldIDWorkaround.hpp" 65 #include "runtime/orderAccess.inline.hpp" 66 #include "runtime/os.inline.hpp" 67 #include "runtime/perfData.hpp" 68 #include "runtime/reflection.hpp" 69 #include "runtime/thread.inline.hpp" 70 #include "runtime/threadSMR.hpp" 71 #include "runtime/vframe.hpp" 72 #include "runtime/vm_operations.hpp" 73 #include "runtime/vm_version.hpp" 74 #include "services/attachListener.hpp" 75 #include "services/management.hpp" 76 #include "services/threadService.hpp" 77 #include "trace/tracing.hpp" 78 #include "utilities/copy.hpp" 79 #include "utilities/defaultStream.hpp" 80 #include "utilities/dtrace.hpp" 81 #include "utilities/events.hpp" 82 #include "utilities/histogram.hpp" 83 #include "utilities/macros.hpp" 84 #include "utilities/utf8.hpp" 85 #if INCLUDE_CDS 86 #include "classfile/sharedClassUtil.hpp" 87 #include "classfile/systemDictionaryShared.hpp" 88 #endif 89 90 #include <errno.h> 91 92 /* 93 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 94 such ctors and calls MUST NOT come between an oop declaration/init and its 95 usage because if objects are move this may cause various memory stomps, bus 96 errors and segfaults. Here is a cookbook for causing so called "naked oop 97 failures": 98 99 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 100 JVMWrapper("JVM_GetClassDeclaredFields"); 101 102 // Object address to be held directly in mirror & not visible to GC 103 oop mirror = JNIHandles::resolve_non_null(ofClass); 104 105 // If this ctor can hit a safepoint, moving objects around, then 106 ComplexConstructor foo; 107 108 // Boom! mirror may point to JUNK instead of the intended object 109 (some dereference of mirror) 110 111 // Here's another call that may block for GC, making mirror stale 112 MutexLocker ml(some_lock); 113 114 // And here's an initializer that can result in a stale oop 115 // all in one step. 116 oop o = call_that_can_throw_exception(TRAPS); 117 118 119 The solution is to keep the oop declaration BELOW the ctor or function 120 call that might cause a GC, do another resolve to reassign the oop, or 121 consider use of a Handle instead of an oop so there is immunity from object 122 motion. But note that the "QUICK" entries below do not have a handlemark 123 and thus can only support use of handles passed in. 124 */ 125 126 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 127 ResourceMark rm; 128 int line_number = -1; 129 const char * source_file = NULL; 130 const char * trace = "explicit"; 131 InstanceKlass* caller = NULL; 132 JavaThread* jthread = JavaThread::current(); 133 if (jthread->has_last_Java_frame()) { 134 vframeStream vfst(jthread); 135 136 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 137 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 138 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 139 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 140 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 141 142 Method* last_caller = NULL; 143 144 while (!vfst.at_end()) { 145 Method* m = vfst.method(); 146 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 147 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 148 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 149 break; 150 } 151 last_caller = m; 152 vfst.next(); 153 } 154 // if this is called from Class.forName0 and that is called from Class.forName, 155 // then print the caller of Class.forName. If this is Class.loadClass, then print 156 // that caller, otherwise keep quiet since this should be picked up elsewhere. 157 bool found_it = false; 158 if (!vfst.at_end() && 159 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 160 vfst.method()->name() == vmSymbols::forName0_name()) { 161 vfst.next(); 162 if (!vfst.at_end() && 163 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 164 vfst.method()->name() == vmSymbols::forName_name()) { 165 vfst.next(); 166 found_it = true; 167 } 168 } else if (last_caller != NULL && 169 last_caller->method_holder()->name() == 170 vmSymbols::java_lang_ClassLoader() && 171 (last_caller->name() == vmSymbols::loadClassInternal_name() || 172 last_caller->name() == vmSymbols::loadClass_name())) { 173 found_it = true; 174 } else if (!vfst.at_end()) { 175 if (vfst.method()->is_native()) { 176 // JNI call 177 found_it = true; 178 } 179 } 180 if (found_it && !vfst.at_end()) { 181 // found the caller 182 caller = vfst.method()->method_holder(); 183 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 184 if (line_number == -1) { 185 // show method name if it's a native method 186 trace = vfst.method()->name_and_sig_as_C_string(); 187 } 188 Symbol* s = caller->source_file_name(); 189 if (s != NULL) { 190 source_file = s->as_C_string(); 191 } 192 } 193 } 194 if (caller != NULL) { 195 if (to_class != caller) { 196 const char * from = caller->external_name(); 197 const char * to = to_class->external_name(); 198 // print in a single call to reduce interleaving between threads 199 if (source_file != NULL) { 200 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 201 } else { 202 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 203 } 204 } 205 } 206 } 207 208 void trace_class_resolution(Klass* to_class) { 209 EXCEPTION_MARK; 210 trace_class_resolution_impl(to_class, THREAD); 211 if (HAS_PENDING_EXCEPTION) { 212 CLEAR_PENDING_EXCEPTION; 213 } 214 } 215 216 // Wrapper to trace JVM functions 217 218 #ifdef ASSERT 219 Histogram* JVMHistogram; 220 volatile int JVMHistogram_lock = 0; 221 222 class JVMHistogramElement : public HistogramElement { 223 public: 224 JVMHistogramElement(const char* name); 225 }; 226 227 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 228 _name = elementName; 229 uintx count = 0; 230 231 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 232 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 233 count +=1; 234 if ( (WarnOnStalledSpinLock > 0) 235 && (count % WarnOnStalledSpinLock == 0)) { 236 warning("JVMHistogram_lock seems to be stalled"); 237 } 238 } 239 } 240 241 if(JVMHistogram == NULL) 242 JVMHistogram = new Histogram("JVM Call Counts",100); 243 244 JVMHistogram->add_element(this); 245 Atomic::dec(&JVMHistogram_lock); 246 } 247 248 #define JVMCountWrapper(arg) \ 249 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 250 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 251 252 #define JVMWrapper(arg) JVMCountWrapper(arg); 253 #else 254 #define JVMWrapper(arg) 255 #endif 256 257 258 // Interface version ///////////////////////////////////////////////////////////////////// 259 260 261 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 262 return JVM_INTERFACE_VERSION; 263 JVM_END 264 265 266 // java.lang.System ////////////////////////////////////////////////////////////////////// 267 268 269 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 270 JVMWrapper("JVM_CurrentTimeMillis"); 271 return os::javaTimeMillis(); 272 JVM_END 273 274 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 275 JVMWrapper("JVM_NanoTime"); 276 return os::javaTimeNanos(); 277 JVM_END 278 279 // The function below is actually exposed by jdk.internal.misc.VM and not 280 // java.lang.System, but we choose to keep it here so that it stays next 281 // to JVM_CurrentTimeMillis and JVM_NanoTime 282 283 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 284 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 285 286 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 287 JVMWrapper("JVM_GetNanoTimeAdjustment"); 288 jlong seconds; 289 jlong nanos; 290 291 os::javaTimeSystemUTC(seconds, nanos); 292 293 // We're going to verify that the result can fit in a long. 294 // For that we need the difference in seconds between 'seconds' 295 // and 'offset_secs' to be such that: 296 // |seconds - offset_secs| < (2^63/10^9) 297 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 298 // which makes |seconds - offset_secs| < 2^33 299 // and we will prefer +/- 2^32 as the maximum acceptable diff 300 // as 2^32 has a more natural feel than 2^33... 301 // 302 // So if |seconds - offset_secs| >= 2^32 - we return a special 303 // sentinel value (-1) which the caller should take as an 304 // exception value indicating that the offset given to us is 305 // too far from range of the current time - leading to too big 306 // a nano adjustment. The caller is expected to recover by 307 // computing a more accurate offset and calling this method 308 // again. (For the record 2^32 secs is ~136 years, so that 309 // should rarely happen) 310 // 311 jlong diff = seconds - offset_secs; 312 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 313 return -1; // sentinel value: the offset is too far off the target 314 } 315 316 // return the adjustment. If you compute a time by adding 317 // this number of nanoseconds along with the number of seconds 318 // in the offset you should get the current UTC time. 319 return (diff * (jlong)1000000000) + nanos; 320 JVM_END 321 322 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 323 jobject dst, jint dst_pos, jint length)) 324 JVMWrapper("JVM_ArrayCopy"); 325 // Check if we have null pointers 326 if (src == NULL || dst == NULL) { 327 THROW(vmSymbols::java_lang_NullPointerException()); 328 } 329 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 330 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 331 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 332 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 333 // Do copy 334 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 335 JVM_END 336 337 338 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 339 JavaValue r(T_OBJECT); 340 // public synchronized Object put(Object key, Object value); 341 HandleMark hm(THREAD); 342 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 343 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 344 JavaCalls::call_virtual(&r, 345 props, 346 SystemDictionary::Properties_klass(), 347 vmSymbols::put_name(), 348 vmSymbols::object_object_object_signature(), 349 key_str, 350 value_str, 351 THREAD); 352 } 353 354 355 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 356 357 358 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 359 JVMWrapper("JVM_InitProperties"); 360 ResourceMark rm; 361 362 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 363 364 // System property list includes both user set via -D option and 365 // jvm system specific properties. 366 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 367 PUTPROP(props, p->key(), p->value()); 368 } 369 370 // Convert the -XX:MaxDirectMemorySize= command line flag 371 // to the sun.nio.MaxDirectMemorySize property. 372 // Do this after setting user properties to prevent people 373 // from setting the value with a -D option, as requested. 374 { 375 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 376 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 377 } else { 378 char as_chars[256]; 379 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 380 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 381 } 382 } 383 384 // JVM monitoring and management support 385 // Add the sun.management.compiler property for the compiler's name 386 { 387 #undef CSIZE 388 #if defined(_LP64) || defined(_WIN64) 389 #define CSIZE "64-Bit " 390 #else 391 #define CSIZE 392 #endif // 64bit 393 394 #ifdef TIERED 395 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 396 #else 397 #if defined(COMPILER1) 398 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 399 #elif defined(COMPILER2) 400 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 401 #elif INCLUDE_JVMCI 402 #error "INCLUDE_JVMCI should imply TIERED" 403 #else 404 const char* compiler_name = ""; 405 #endif // compilers 406 #endif // TIERED 407 408 if (*compiler_name != '\0' && 409 (Arguments::mode() != Arguments::_int)) { 410 PUTPROP(props, "sun.management.compiler", compiler_name); 411 } 412 } 413 414 return properties; 415 JVM_END 416 417 418 /* 419 * Return the temporary directory that the VM uses for the attach 420 * and perf data files. 421 * 422 * It is important that this directory is well-known and the 423 * same for all VM instances. It cannot be affected by configuration 424 * variables such as java.io.tmpdir. 425 */ 426 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 427 JVMWrapper("JVM_GetTemporaryDirectory"); 428 HandleMark hm(THREAD); 429 const char* temp_dir = os::get_temp_directory(); 430 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 431 return (jstring) JNIHandles::make_local(env, h()); 432 JVM_END 433 434 435 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 436 437 extern volatile jint vm_created; 438 439 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 440 before_exit(thread); 441 vm_exit(code); 442 JVM_END 443 444 445 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 446 JVMWrapper("JVM_GC"); 447 if (!DisableExplicitGC) { 448 Universe::heap()->collect(GCCause::_java_lang_system_gc); 449 } 450 JVM_END 451 452 453 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 454 JVMWrapper("JVM_MaxObjectInspectionAge"); 455 return Universe::heap()->millis_since_last_gc(); 456 JVM_END 457 458 459 static inline jlong convert_size_t_to_jlong(size_t val) { 460 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 461 NOT_LP64 (return (jlong)val;) 462 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 463 } 464 465 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 466 JVMWrapper("JVM_TotalMemory"); 467 size_t n = Universe::heap()->capacity(); 468 return convert_size_t_to_jlong(n); 469 JVM_END 470 471 472 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 473 JVMWrapper("JVM_FreeMemory"); 474 CollectedHeap* ch = Universe::heap(); 475 size_t n; 476 { 477 MutexLocker x(Heap_lock); 478 n = ch->capacity() - ch->used(); 479 } 480 return convert_size_t_to_jlong(n); 481 JVM_END 482 483 484 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 485 JVMWrapper("JVM_MaxMemory"); 486 size_t n = Universe::heap()->max_capacity(); 487 return convert_size_t_to_jlong(n); 488 JVM_END 489 490 491 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 492 JVMWrapper("JVM_ActiveProcessorCount"); 493 return os::active_processor_count(); 494 JVM_END 495 496 497 498 // java.lang.Throwable ////////////////////////////////////////////////////// 499 500 501 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 502 JVMWrapper("JVM_FillInStackTrace"); 503 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 504 java_lang_Throwable::fill_in_stack_trace(exception); 505 JVM_END 506 507 508 // java.lang.StackTraceElement ////////////////////////////////////////////// 509 510 511 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 512 JVMWrapper("JVM_InitStackTraceElementArray"); 513 Handle exception(THREAD, JNIHandles::resolve(throwable)); 514 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 515 objArrayHandle stack_trace(THREAD, st); 516 // Fill in the allocated stack trace 517 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 518 JVM_END 519 520 521 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 522 JVMWrapper("JVM_InitStackTraceElement"); 523 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 524 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 525 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 526 JVM_END 527 528 529 // java.lang.StackWalker ////////////////////////////////////////////////////// 530 531 532 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 533 jint skip_frames, jint frame_count, jint start_index, 534 jobjectArray frames)) 535 JVMWrapper("JVM_CallStackWalk"); 536 JavaThread* jt = (JavaThread*) THREAD; 537 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 538 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 539 } 540 541 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 542 543 // frames array is a Class<?>[] array when only getting caller reference, 544 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 545 // be null. 546 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 547 objArrayHandle frames_array_h(THREAD, fa); 548 549 int limit = start_index + frame_count; 550 if (frames_array_h->length() < limit) { 551 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 552 } 553 554 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 555 start_index, frames_array_h, CHECK_NULL); 556 return JNIHandles::make_local(env, result); 557 JVM_END 558 559 560 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 561 jint frame_count, jint start_index, 562 jobjectArray frames)) 563 JVMWrapper("JVM_MoreStackWalk"); 564 JavaThread* jt = (JavaThread*) THREAD; 565 566 // frames array is a Class<?>[] array when only getting caller reference, 567 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 568 // be null. 569 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 570 objArrayHandle frames_array_h(THREAD, fa); 571 572 int limit = start_index+frame_count; 573 if (frames_array_h->length() < limit) { 574 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 575 } 576 577 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 578 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 579 start_index, frames_array_h, THREAD); 580 JVM_END 581 582 // java.lang.Object /////////////////////////////////////////////// 583 584 585 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 586 JVMWrapper("JVM_IHashCode"); 587 // as implemented in the classic virtual machine; return 0 if object is NULL 588 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 589 JVM_END 590 591 592 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 593 JVMWrapper("JVM_MonitorWait"); 594 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 595 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 596 if (JvmtiExport::should_post_monitor_wait()) { 597 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 598 599 // The current thread already owns the monitor and it has not yet 600 // been added to the wait queue so the current thread cannot be 601 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 602 // event handler cannot accidentally consume an unpark() meant for 603 // the ParkEvent associated with this ObjectMonitor. 604 } 605 ObjectSynchronizer::wait(obj, ms, CHECK); 606 JVM_END 607 608 609 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 610 JVMWrapper("JVM_MonitorNotify"); 611 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 612 ObjectSynchronizer::notify(obj, CHECK); 613 JVM_END 614 615 616 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 617 JVMWrapper("JVM_MonitorNotifyAll"); 618 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 619 ObjectSynchronizer::notifyall(obj, CHECK); 620 JVM_END 621 622 623 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 624 JVMWrapper("JVM_Clone"); 625 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 626 Klass* klass = obj->klass(); 627 JvmtiVMObjectAllocEventCollector oam; 628 629 #ifdef ASSERT 630 // Just checking that the cloneable flag is set correct 631 if (obj->is_array()) { 632 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 633 } else { 634 guarantee(obj->is_instance(), "should be instanceOop"); 635 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 636 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 637 } 638 #endif 639 640 // Check if class of obj supports the Cloneable interface. 641 // All arrays are considered to be cloneable (See JLS 20.1.5) 642 if (!klass->is_cloneable()) { 643 ResourceMark rm(THREAD); 644 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 645 } 646 647 // Make shallow object copy 648 const int size = obj->size(); 649 oop new_obj_oop = NULL; 650 if (obj->is_array()) { 651 const int length = ((arrayOop)obj())->length(); 652 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 653 } else { 654 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 655 } 656 657 HeapAccess<>::clone(obj(), new_obj_oop, size); 658 659 Handle new_obj(THREAD, new_obj_oop); 660 // Caution: this involves a java upcall, so the clone should be 661 // "gc-robust" by this stage. 662 if (klass->has_finalizer()) { 663 assert(obj->is_instance(), "should be instanceOop"); 664 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 665 new_obj = Handle(THREAD, new_obj_oop); 666 } 667 668 return JNIHandles::make_local(env, new_obj()); 669 JVM_END 670 671 // java.io.File /////////////////////////////////////////////////////////////// 672 673 JVM_LEAF(char*, JVM_NativePath(char* path)) 674 JVMWrapper("JVM_NativePath"); 675 return os::native_path(path); 676 JVM_END 677 678 679 // Misc. class handling /////////////////////////////////////////////////////////// 680 681 682 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 683 JVMWrapper("JVM_GetCallerClass"); 684 685 // Getting the class of the caller frame. 686 // 687 // The call stack at this point looks something like this: 688 // 689 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 690 // [1] [ @CallerSensitive API.method ] 691 // [.] [ (skipped intermediate frames) ] 692 // [n] [ caller ] 693 vframeStream vfst(thread); 694 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 695 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 696 Method* m = vfst.method(); 697 assert(m != NULL, "sanity"); 698 switch (n) { 699 case 0: 700 // This must only be called from Reflection.getCallerClass 701 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 702 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 703 } 704 // fall-through 705 case 1: 706 // Frame 0 and 1 must be caller sensitive. 707 if (!m->caller_sensitive()) { 708 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 709 } 710 break; 711 default: 712 if (!m->is_ignored_by_security_stack_walk()) { 713 // We have reached the desired frame; return the holder class. 714 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 715 } 716 break; 717 } 718 } 719 return NULL; 720 JVM_END 721 722 723 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 724 JVMWrapper("JVM_FindPrimitiveClass"); 725 oop mirror = NULL; 726 BasicType t = name2type(utf); 727 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 728 mirror = Universe::java_mirror(t); 729 } 730 if (mirror == NULL) { 731 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 732 } else { 733 return (jclass) JNIHandles::make_local(env, mirror); 734 } 735 JVM_END 736 737 738 // Returns a class loaded by the bootstrap class loader; or null 739 // if not found. ClassNotFoundException is not thrown. 740 // FindClassFromBootLoader is exported to the launcher for windows. 741 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 742 const char* name)) 743 JVMWrapper("JVM_FindClassFromBootLoader"); 744 745 // Java libraries should ensure that name is never null... 746 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 747 // It's impossible to create this class; the name cannot fit 748 // into the constant pool. 749 return NULL; 750 } 751 752 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 753 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 754 if (k == NULL) { 755 return NULL; 756 } 757 758 if (log_is_enabled(Debug, class, resolve)) { 759 trace_class_resolution(k); 760 } 761 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 762 JVM_END 763 764 // Find a class with this name in this loader, using the caller's protection domain. 765 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 766 jboolean init, jobject loader, 767 jclass caller)) 768 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 769 // Java libraries should ensure that name is never null... 770 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 771 // It's impossible to create this class; the name cannot fit 772 // into the constant pool. 773 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 774 } 775 776 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 777 778 oop loader_oop = JNIHandles::resolve(loader); 779 oop from_class = JNIHandles::resolve(caller); 780 oop protection_domain = NULL; 781 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 782 // NPE. Put it in another way, the bootstrap class loader has all permission and 783 // thus no checkPackageAccess equivalence in the VM class loader. 784 // The caller is also passed as NULL by the java code if there is no security 785 // manager to avoid the performance cost of getting the calling class. 786 if (from_class != NULL && loader_oop != NULL) { 787 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 788 } 789 790 Handle h_loader(THREAD, loader_oop); 791 Handle h_prot(THREAD, protection_domain); 792 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 793 h_prot, false, THREAD); 794 795 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 796 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 797 } 798 return result; 799 JVM_END 800 801 // Currently only called from the old verifier. 802 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 803 jboolean init, jclass from)) 804 JVMWrapper("JVM_FindClassFromClass"); 805 if (name == NULL) { 806 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 807 } 808 if ((int)strlen(name) > Symbol::max_length()) { 809 // It's impossible to create this class; the name cannot fit 810 // into the constant pool. 811 Exceptions::fthrow(THREAD_AND_LOCATION, 812 vmSymbols::java_lang_NoClassDefFoundError(), 813 "Class name exceeds maximum length of %d: %s", 814 Symbol::max_length(), 815 name); 816 return 0; 817 } 818 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 819 oop from_class_oop = JNIHandles::resolve(from); 820 Klass* from_class = (from_class_oop == NULL) 821 ? (Klass*)NULL 822 : java_lang_Class::as_Klass(from_class_oop); 823 oop class_loader = NULL; 824 oop protection_domain = NULL; 825 if (from_class != NULL) { 826 class_loader = from_class->class_loader(); 827 protection_domain = from_class->protection_domain(); 828 } 829 Handle h_loader(THREAD, class_loader); 830 Handle h_prot (THREAD, protection_domain); 831 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 832 h_prot, true, thread); 833 834 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 835 // this function is generally only used for class loading during verification. 836 ResourceMark rm; 837 oop from_mirror = JNIHandles::resolve_non_null(from); 838 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 839 const char * from_name = from_class->external_name(); 840 841 oop mirror = JNIHandles::resolve_non_null(result); 842 Klass* to_class = java_lang_Class::as_Klass(mirror); 843 const char * to = to_class->external_name(); 844 log_debug(class, resolve)("%s %s (verification)", from_name, to); 845 } 846 847 return result; 848 JVM_END 849 850 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 851 if (loader.is_null()) { 852 return; 853 } 854 855 // check whether the current caller thread holds the lock or not. 856 // If not, increment the corresponding counter 857 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 858 ObjectSynchronizer::owner_self) { 859 counter->inc(); 860 } 861 } 862 863 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 864 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 865 jobject loader, const jbyte *buf, 866 jsize len, jobject pd, const char *source, 867 TRAPS) { 868 if (source == NULL) source = "__JVM_DefineClass__"; 869 870 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 871 JavaThread* jt = (JavaThread*) THREAD; 872 873 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 874 ClassLoader::perf_define_appclass_selftime(), 875 ClassLoader::perf_define_appclasses(), 876 jt->get_thread_stat()->perf_recursion_counts_addr(), 877 jt->get_thread_stat()->perf_timers_addr(), 878 PerfClassTraceTime::DEFINE_CLASS); 879 880 if (UsePerfData) { 881 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 882 } 883 884 // Since exceptions can be thrown, class initialization can take place 885 // if name is NULL no check for class name in .class stream has to be made. 886 TempNewSymbol class_name = NULL; 887 if (name != NULL) { 888 const int str_len = (int)strlen(name); 889 if (str_len > Symbol::max_length()) { 890 // It's impossible to create this class; the name cannot fit 891 // into the constant pool. 892 Exceptions::fthrow(THREAD_AND_LOCATION, 893 vmSymbols::java_lang_NoClassDefFoundError(), 894 "Class name exceeds maximum length of %d: %s", 895 Symbol::max_length(), 896 name); 897 return 0; 898 } 899 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 900 } 901 902 ResourceMark rm(THREAD); 903 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 904 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 905 if (UsePerfData) { 906 is_lock_held_by_thread(class_loader, 907 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 908 THREAD); 909 } 910 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 911 Klass* k = SystemDictionary::resolve_from_stream(class_name, 912 class_loader, 913 protection_domain, 914 &st, 915 CHECK_NULL); 916 917 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 918 trace_class_resolution(k); 919 } 920 921 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 922 } 923 924 925 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 926 JVMWrapper("JVM_DefineClass"); 927 928 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 929 JVM_END 930 931 932 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 933 JVMWrapper("JVM_DefineClassWithSource"); 934 935 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 936 JVM_END 937 938 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 939 JVMWrapper("JVM_FindLoadedClass"); 940 ResourceMark rm(THREAD); 941 942 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 943 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 944 945 const char* str = java_lang_String::as_utf8_string(string()); 946 // Sanity check, don't expect null 947 if (str == NULL) return NULL; 948 949 const int str_len = (int)strlen(str); 950 if (str_len > Symbol::max_length()) { 951 // It's impossible to create this class; the name cannot fit 952 // into the constant pool. 953 return NULL; 954 } 955 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 956 957 // Security Note: 958 // The Java level wrapper will perform the necessary security check allowing 959 // us to pass the NULL as the initiating class loader. 960 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 961 if (UsePerfData) { 962 is_lock_held_by_thread(h_loader, 963 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 964 THREAD); 965 } 966 967 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 968 h_loader, 969 Handle(), 970 CHECK_NULL); 971 #if INCLUDE_CDS 972 if (k == NULL) { 973 // If the class is not already loaded, try to see if it's in the shared 974 // archive for the current classloader (h_loader). 975 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 976 } 977 #endif 978 return (k == NULL) ? NULL : 979 (jclass) JNIHandles::make_local(env, k->java_mirror()); 980 JVM_END 981 982 // Module support ////////////////////////////////////////////////////////////////////////////// 983 984 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 985 jstring location, const char* const* packages, jsize num_packages)) 986 JVMWrapper("JVM_DefineModule"); 987 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 988 JVM_END 989 990 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 991 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 992 Modules::set_bootloader_unnamed_module(module, CHECK); 993 JVM_END 994 995 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 996 JVMWrapper("JVM_AddModuleExports"); 997 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 998 JVM_END 999 1000 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1001 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1002 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1003 JVM_END 1004 1005 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1006 JVMWrapper("JVM_AddModuleExportsToAll"); 1007 Modules::add_module_exports(from_module, package, NULL, CHECK); 1008 JVM_END 1009 1010 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1011 JVMWrapper("JVM_AddReadsModule"); 1012 Modules::add_reads_module(from_module, source_module, CHECK); 1013 JVM_END 1014 1015 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1016 1017 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1018 assert (cls != NULL, "illegal class"); 1019 JVMWrapper("JVM_GetClassName"); 1020 JvmtiVMObjectAllocEventCollector oam; 1021 ResourceMark rm(THREAD); 1022 const char* name; 1023 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1024 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1025 } else { 1026 // Consider caching interned string in Klass 1027 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1028 assert(k->is_klass(), "just checking"); 1029 name = k->external_name(); 1030 } 1031 oop result = StringTable::intern((char*) name, CHECK_NULL); 1032 return (jstring) JNIHandles::make_local(env, result); 1033 JVM_END 1034 1035 1036 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1037 JVMWrapper("JVM_GetClassInterfaces"); 1038 JvmtiVMObjectAllocEventCollector oam; 1039 oop mirror = JNIHandles::resolve_non_null(cls); 1040 1041 // Special handling for primitive objects 1042 if (java_lang_Class::is_primitive(mirror)) { 1043 // Primitive objects does not have any interfaces 1044 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1045 return (jobjectArray) JNIHandles::make_local(env, r); 1046 } 1047 1048 Klass* klass = java_lang_Class::as_Klass(mirror); 1049 // Figure size of result array 1050 int size; 1051 if (klass->is_instance_klass()) { 1052 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1053 } else { 1054 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1055 size = 2; 1056 } 1057 1058 // Allocate result array 1059 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1060 objArrayHandle result (THREAD, r); 1061 // Fill in result 1062 if (klass->is_instance_klass()) { 1063 // Regular instance klass, fill in all local interfaces 1064 for (int index = 0; index < size; index++) { 1065 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1066 result->obj_at_put(index, k->java_mirror()); 1067 } 1068 } else { 1069 // All arrays implement java.lang.Cloneable and java.io.Serializable 1070 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1071 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1072 } 1073 return (jobjectArray) JNIHandles::make_local(env, result()); 1074 JVM_END 1075 1076 1077 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1078 JVMWrapper("JVM_IsInterface"); 1079 oop mirror = JNIHandles::resolve_non_null(cls); 1080 if (java_lang_Class::is_primitive(mirror)) { 1081 return JNI_FALSE; 1082 } 1083 Klass* k = java_lang_Class::as_Klass(mirror); 1084 jboolean result = k->is_interface(); 1085 assert(!result || k->is_instance_klass(), 1086 "all interfaces are instance types"); 1087 // The compiler intrinsic for isInterface tests the 1088 // Klass::_access_flags bits in the same way. 1089 return result; 1090 JVM_END 1091 1092 1093 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1094 JVMWrapper("JVM_GetClassSigners"); 1095 JvmtiVMObjectAllocEventCollector oam; 1096 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1097 // There are no signers for primitive types 1098 return NULL; 1099 } 1100 1101 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1102 1103 // If there are no signers set in the class, or if the class 1104 // is an array, return NULL. 1105 if (signers == NULL) return NULL; 1106 1107 // copy of the signers array 1108 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1109 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1110 for (int index = 0; index < signers->length(); index++) { 1111 signers_copy->obj_at_put(index, signers->obj_at(index)); 1112 } 1113 1114 // return the copy 1115 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1116 JVM_END 1117 1118 1119 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1120 JVMWrapper("JVM_SetClassSigners"); 1121 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1122 // This call is ignored for primitive types and arrays. 1123 // Signers are only set once, ClassLoader.java, and thus shouldn't 1124 // be called with an array. Only the bootstrap loader creates arrays. 1125 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1126 if (k->is_instance_klass()) { 1127 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1128 } 1129 } 1130 JVM_END 1131 1132 1133 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1134 JVMWrapper("JVM_GetProtectionDomain"); 1135 if (JNIHandles::resolve(cls) == NULL) { 1136 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1137 } 1138 1139 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1140 // Primitive types does not have a protection domain. 1141 return NULL; 1142 } 1143 1144 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1145 return (jobject) JNIHandles::make_local(env, pd); 1146 JVM_END 1147 1148 1149 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) { 1150 // If there is a security manager and protection domain, check the access 1151 // in the protection domain, otherwise it is authorized. 1152 if (java_lang_System::has_security_manager()) { 1153 1154 // For bootstrapping, if pd implies method isn't in the JDK, allow 1155 // this context to revert to older behavior. 1156 // In this case the isAuthorized field in AccessControlContext is also not 1157 // present. 1158 if (Universe::protection_domain_implies_method() == NULL) { 1159 return true; 1160 } 1161 1162 // Whitelist certain access control contexts 1163 if (java_security_AccessControlContext::is_authorized(context)) { 1164 return true; 1165 } 1166 1167 oop prot = klass->protection_domain(); 1168 if (prot != NULL) { 1169 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1170 // in the new wrapper. 1171 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1172 Handle h_prot(THREAD, prot); 1173 JavaValue result(T_BOOLEAN); 1174 JavaCallArguments args(h_prot); 1175 JavaCalls::call(&result, m, &args, CHECK_false); 1176 return (result.get_jboolean() != 0); 1177 } 1178 } 1179 return true; 1180 } 1181 1182 // Create an AccessControlContext with a protection domain with null codesource 1183 // and null permissions - which gives no permissions. 1184 oop create_dummy_access_control_context(TRAPS) { 1185 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1186 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1187 // Call constructor ProtectionDomain(null, null); 1188 JavaValue result(T_VOID); 1189 JavaCalls::call_special(&result, obj, pd_klass, 1190 vmSymbols::object_initializer_name(), 1191 vmSymbols::codesource_permissioncollection_signature(), 1192 Handle(), Handle(), CHECK_NULL); 1193 1194 // new ProtectionDomain[] {pd}; 1195 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1196 context->obj_at_put(0, obj()); 1197 1198 // new AccessControlContext(new ProtectionDomain[] {pd}) 1199 objArrayHandle h_context(THREAD, context); 1200 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1201 return acc; 1202 } 1203 1204 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1205 JVMWrapper("JVM_DoPrivileged"); 1206 1207 if (action == NULL) { 1208 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1209 } 1210 1211 // Compute the frame initiating the do privileged operation and setup the privileged stack 1212 vframeStream vfst(thread); 1213 vfst.security_get_caller_frame(1); 1214 1215 if (vfst.at_end()) { 1216 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1217 } 1218 1219 Method* method = vfst.method(); 1220 InstanceKlass* klass = method->method_holder(); 1221 1222 // Check that action object understands "Object run()" 1223 Handle h_context; 1224 if (context != NULL) { 1225 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1226 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1227 if (!authorized) { 1228 // Create an unprivileged access control object and call it's run function 1229 // instead. 1230 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1231 h_context = Handle(THREAD, noprivs); 1232 } 1233 } 1234 1235 // Check that action object understands "Object run()" 1236 Handle object (THREAD, JNIHandles::resolve(action)); 1237 1238 // get run() method 1239 Method* m_oop = object->klass()->uncached_lookup_method( 1240 vmSymbols::run_method_name(), 1241 vmSymbols::void_object_signature(), 1242 Klass::find_overpass); 1243 1244 // See if there is a default method for "Object run()". 1245 if (m_oop == NULL && object->klass()->is_instance_klass()) { 1246 InstanceKlass* iklass = InstanceKlass::cast(object->klass()); 1247 m_oop = iklass->lookup_method_in_ordered_interfaces( 1248 vmSymbols::run_method_name(), 1249 vmSymbols::void_object_signature()); 1250 } 1251 1252 methodHandle m (THREAD, m_oop); 1253 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) { 1254 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1255 } 1256 1257 // Stack allocated list of privileged stack elements 1258 PrivilegedElement pi; 1259 if (!vfst.at_end()) { 1260 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1261 thread->set_privileged_stack_top(&pi); 1262 } 1263 1264 1265 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1266 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1267 Handle pending_exception; 1268 JavaValue result(T_OBJECT); 1269 JavaCallArguments args(object); 1270 JavaCalls::call(&result, m, &args, THREAD); 1271 1272 // done with action, remove ourselves from the list 1273 if (!vfst.at_end()) { 1274 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1275 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1276 } 1277 1278 if (HAS_PENDING_EXCEPTION) { 1279 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1280 CLEAR_PENDING_EXCEPTION; 1281 // JVMTI has already reported the pending exception 1282 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1283 if (THREAD->is_Java_thread()) { 1284 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1285 } 1286 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1287 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1288 // Throw a java.security.PrivilegedActionException(Exception e) exception 1289 JavaCallArguments args(pending_exception); 1290 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1291 vmSymbols::exception_void_signature(), 1292 &args); 1293 } 1294 } 1295 1296 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1297 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1298 JVM_END 1299 1300 1301 // Returns the inherited_access_control_context field of the running thread. 1302 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1303 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1304 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1305 return JNIHandles::make_local(env, result); 1306 JVM_END 1307 1308 class RegisterArrayForGC { 1309 private: 1310 JavaThread *_thread; 1311 public: 1312 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1313 _thread = thread; 1314 _thread->register_array_for_gc(array); 1315 } 1316 1317 ~RegisterArrayForGC() { 1318 _thread->register_array_for_gc(NULL); 1319 } 1320 }; 1321 1322 1323 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1324 JVMWrapper("JVM_GetStackAccessControlContext"); 1325 if (!UsePrivilegedStack) return NULL; 1326 1327 ResourceMark rm(THREAD); 1328 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1329 JvmtiVMObjectAllocEventCollector oam; 1330 1331 // count the protection domains on the execution stack. We collapse 1332 // duplicate consecutive protection domains into a single one, as 1333 // well as stopping when we hit a privileged frame. 1334 1335 // Use vframeStream to iterate through Java frames 1336 vframeStream vfst(thread); 1337 1338 oop previous_protection_domain = NULL; 1339 Handle privileged_context(thread, NULL); 1340 bool is_privileged = false; 1341 oop protection_domain = NULL; 1342 1343 for(; !vfst.at_end(); vfst.next()) { 1344 // get method of frame 1345 Method* method = vfst.method(); 1346 intptr_t* frame_id = vfst.frame_id(); 1347 1348 // check the privileged frames to see if we have a match 1349 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1350 // this frame is privileged 1351 is_privileged = true; 1352 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1353 protection_domain = thread->privileged_stack_top()->protection_domain(); 1354 } else { 1355 protection_domain = method->method_holder()->protection_domain(); 1356 } 1357 1358 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1359 local_array->push(protection_domain); 1360 previous_protection_domain = protection_domain; 1361 } 1362 1363 if (is_privileged) break; 1364 } 1365 1366 1367 // either all the domains on the stack were system domains, or 1368 // we had a privileged system domain 1369 if (local_array->is_empty()) { 1370 if (is_privileged && privileged_context.is_null()) return NULL; 1371 1372 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1373 return JNIHandles::make_local(env, result); 1374 } 1375 1376 // the resource area must be registered in case of a gc 1377 RegisterArrayForGC ragc(thread, local_array); 1378 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1379 local_array->length(), CHECK_NULL); 1380 objArrayHandle h_context(thread, context); 1381 for (int index = 0; index < local_array->length(); index++) { 1382 h_context->obj_at_put(index, local_array->at(index)); 1383 } 1384 1385 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1386 1387 return JNIHandles::make_local(env, result); 1388 JVM_END 1389 1390 1391 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1392 JVMWrapper("JVM_IsArrayClass"); 1393 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1394 return (k != NULL) && k->is_array_klass() ? true : false; 1395 JVM_END 1396 1397 1398 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1399 JVMWrapper("JVM_IsPrimitiveClass"); 1400 oop mirror = JNIHandles::resolve_non_null(cls); 1401 return (jboolean) java_lang_Class::is_primitive(mirror); 1402 JVM_END 1403 1404 1405 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1406 JVMWrapper("JVM_GetClassModifiers"); 1407 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1408 // Primitive type 1409 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1410 } 1411 1412 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1413 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1414 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1415 return k->modifier_flags(); 1416 JVM_END 1417 1418 1419 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1420 1421 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1422 JvmtiVMObjectAllocEventCollector oam; 1423 // ofClass is a reference to a java_lang_Class object. The mirror object 1424 // of an InstanceKlass 1425 1426 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1427 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1428 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1429 return (jobjectArray)JNIHandles::make_local(env, result); 1430 } 1431 1432 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1433 InnerClassesIterator iter(k); 1434 1435 if (iter.length() == 0) { 1436 // Neither an inner nor outer class 1437 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1438 return (jobjectArray)JNIHandles::make_local(env, result); 1439 } 1440 1441 // find inner class info 1442 constantPoolHandle cp(thread, k->constants()); 1443 int length = iter.length(); 1444 1445 // Allocate temp. result array 1446 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1447 objArrayHandle result (THREAD, r); 1448 int members = 0; 1449 1450 for (; !iter.done(); iter.next()) { 1451 int ioff = iter.inner_class_info_index(); 1452 int ooff = iter.outer_class_info_index(); 1453 1454 if (ioff != 0 && ooff != 0) { 1455 // Check to see if the name matches the class we're looking for 1456 // before attempting to find the class. 1457 if (cp->klass_name_at_matches(k, ooff)) { 1458 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1459 if (outer_klass == k) { 1460 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1461 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1462 1463 // Throws an exception if outer klass has not declared k as 1464 // an inner klass 1465 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1466 1467 result->obj_at_put(members, inner_klass->java_mirror()); 1468 members++; 1469 } 1470 } 1471 } 1472 } 1473 1474 if (members != length) { 1475 // Return array of right length 1476 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1477 for(int i = 0; i < members; i++) { 1478 res->obj_at_put(i, result->obj_at(i)); 1479 } 1480 return (jobjectArray)JNIHandles::make_local(env, res); 1481 } 1482 1483 return (jobjectArray)JNIHandles::make_local(env, result()); 1484 JVM_END 1485 1486 1487 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1488 { 1489 // ofClass is a reference to a java_lang_Class object. 1490 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1491 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1492 return NULL; 1493 } 1494 1495 bool inner_is_member = false; 1496 Klass* outer_klass 1497 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1498 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1499 if (outer_klass == NULL) return NULL; // already a top-level class 1500 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1501 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1502 } 1503 JVM_END 1504 1505 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1506 { 1507 oop mirror = JNIHandles::resolve_non_null(cls); 1508 if (java_lang_Class::is_primitive(mirror) || 1509 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1510 return NULL; 1511 } 1512 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1513 int ooff = 0, noff = 0; 1514 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1515 if (noff != 0) { 1516 constantPoolHandle i_cp(thread, k->constants()); 1517 Symbol* name = i_cp->symbol_at(noff); 1518 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1519 return (jstring) JNIHandles::make_local(env, str()); 1520 } 1521 } 1522 return NULL; 1523 } 1524 JVM_END 1525 1526 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1527 assert (cls != NULL, "illegal class"); 1528 JVMWrapper("JVM_GetClassSignature"); 1529 JvmtiVMObjectAllocEventCollector oam; 1530 ResourceMark rm(THREAD); 1531 // Return null for arrays and primatives 1532 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1533 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1534 if (k->is_instance_klass()) { 1535 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1536 if (sym == NULL) return NULL; 1537 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1538 return (jstring) JNIHandles::make_local(env, str()); 1539 } 1540 } 1541 return NULL; 1542 JVM_END 1543 1544 1545 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1546 assert (cls != NULL, "illegal class"); 1547 JVMWrapper("JVM_GetClassAnnotations"); 1548 1549 // Return null for arrays and primitives 1550 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1551 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1552 if (k->is_instance_klass()) { 1553 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1554 return (jbyteArray) JNIHandles::make_local(env, a); 1555 } 1556 } 1557 return NULL; 1558 JVM_END 1559 1560 1561 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1562 // some of this code was adapted from from jni_FromReflectedField 1563 1564 oop reflected = JNIHandles::resolve_non_null(field); 1565 oop mirror = java_lang_reflect_Field::clazz(reflected); 1566 Klass* k = java_lang_Class::as_Klass(mirror); 1567 int slot = java_lang_reflect_Field::slot(reflected); 1568 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1569 1570 InstanceKlass* ik = InstanceKlass::cast(k); 1571 intptr_t offset = ik->field_offset(slot); 1572 1573 if (modifiers & JVM_ACC_STATIC) { 1574 // for static fields we only look in the current class 1575 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1576 assert(false, "cannot find static field"); 1577 return false; 1578 } 1579 } else { 1580 // for instance fields we start with the current class and work 1581 // our way up through the superclass chain 1582 if (!ik->find_field_from_offset(offset, false, &fd)) { 1583 assert(false, "cannot find instance field"); 1584 return false; 1585 } 1586 } 1587 return true; 1588 } 1589 1590 static Method* jvm_get_method_common(jobject method) { 1591 // some of this code was adapted from from jni_FromReflectedMethod 1592 1593 oop reflected = JNIHandles::resolve_non_null(method); 1594 oop mirror = NULL; 1595 int slot = 0; 1596 1597 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1598 mirror = java_lang_reflect_Constructor::clazz(reflected); 1599 slot = java_lang_reflect_Constructor::slot(reflected); 1600 } else { 1601 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1602 "wrong type"); 1603 mirror = java_lang_reflect_Method::clazz(reflected); 1604 slot = java_lang_reflect_Method::slot(reflected); 1605 } 1606 Klass* k = java_lang_Class::as_Klass(mirror); 1607 1608 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1609 assert(m != NULL, "cannot find method"); 1610 return m; // caller has to deal with NULL in product mode 1611 } 1612 1613 /* Type use annotations support (JDK 1.8) */ 1614 1615 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1616 assert (cls != NULL, "illegal class"); 1617 JVMWrapper("JVM_GetClassTypeAnnotations"); 1618 ResourceMark rm(THREAD); 1619 // Return null for arrays and primitives 1620 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1621 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1622 if (k->is_instance_klass()) { 1623 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1624 if (type_annotations != NULL) { 1625 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1626 return (jbyteArray) JNIHandles::make_local(env, a); 1627 } 1628 } 1629 } 1630 return NULL; 1631 JVM_END 1632 1633 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1634 assert (method != NULL, "illegal method"); 1635 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1636 1637 // method is a handle to a java.lang.reflect.Method object 1638 Method* m = jvm_get_method_common(method); 1639 if (m == NULL) { 1640 return NULL; 1641 } 1642 1643 AnnotationArray* type_annotations = m->type_annotations(); 1644 if (type_annotations != NULL) { 1645 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1646 return (jbyteArray) JNIHandles::make_local(env, a); 1647 } 1648 1649 return NULL; 1650 JVM_END 1651 1652 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1653 assert (field != NULL, "illegal field"); 1654 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1655 1656 fieldDescriptor fd; 1657 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1658 if (!gotFd) { 1659 return NULL; 1660 } 1661 1662 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1663 JVM_END 1664 1665 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1666 if (!cp->is_within_bounds(index)) { 1667 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1668 } 1669 } 1670 1671 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1672 { 1673 JVMWrapper("JVM_GetMethodParameters"); 1674 // method is a handle to a java.lang.reflect.Method object 1675 Method* method_ptr = jvm_get_method_common(method); 1676 methodHandle mh (THREAD, method_ptr); 1677 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1678 const int num_params = mh->method_parameters_length(); 1679 1680 if (num_params < 0) { 1681 // A -1 return value from method_parameters_length means there is no 1682 // parameter data. Return null to indicate this to the reflection 1683 // API. 1684 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1685 return (jobjectArray)NULL; 1686 } else { 1687 // Otherwise, we return something up to reflection, even if it is 1688 // a zero-length array. Why? Because in some cases this can 1689 // trigger a MalformedParametersException. 1690 1691 // make sure all the symbols are properly formatted 1692 for (int i = 0; i < num_params; i++) { 1693 MethodParametersElement* params = mh->method_parameters_start(); 1694 int index = params[i].name_cp_index; 1695 bounds_check(mh->constants(), index, CHECK_NULL); 1696 1697 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1698 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1699 "Wrong type at constant pool index"); 1700 } 1701 1702 } 1703 1704 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1705 objArrayHandle result (THREAD, result_oop); 1706 1707 for (int i = 0; i < num_params; i++) { 1708 MethodParametersElement* params = mh->method_parameters_start(); 1709 // For a 0 index, give a NULL symbol 1710 Symbol* sym = 0 != params[i].name_cp_index ? 1711 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1712 int flags = params[i].flags; 1713 oop param = Reflection::new_parameter(reflected_method, i, sym, 1714 flags, CHECK_NULL); 1715 result->obj_at_put(i, param); 1716 } 1717 return (jobjectArray)JNIHandles::make_local(env, result()); 1718 } 1719 } 1720 JVM_END 1721 1722 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1723 1724 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1725 { 1726 JVMWrapper("JVM_GetClassDeclaredFields"); 1727 JvmtiVMObjectAllocEventCollector oam; 1728 1729 // Exclude primitive types and array types 1730 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1731 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1732 // Return empty array 1733 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1734 return (jobjectArray) JNIHandles::make_local(env, res); 1735 } 1736 1737 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1738 constantPoolHandle cp(THREAD, k->constants()); 1739 1740 // Ensure class is linked 1741 k->link_class(CHECK_NULL); 1742 1743 // Allocate result 1744 int num_fields; 1745 1746 if (publicOnly) { 1747 num_fields = 0; 1748 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1749 if (fs.access_flags().is_public()) ++num_fields; 1750 } 1751 } else { 1752 num_fields = k->java_fields_count(); 1753 } 1754 1755 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1756 objArrayHandle result (THREAD, r); 1757 1758 int out_idx = 0; 1759 fieldDescriptor fd; 1760 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1761 if (!publicOnly || fs.access_flags().is_public()) { 1762 fd.reinitialize(k, fs.index()); 1763 oop field = Reflection::new_field(&fd, CHECK_NULL); 1764 result->obj_at_put(out_idx, field); 1765 ++out_idx; 1766 } 1767 } 1768 assert(out_idx == num_fields, "just checking"); 1769 return (jobjectArray) JNIHandles::make_local(env, result()); 1770 } 1771 JVM_END 1772 1773 static bool select_method(const methodHandle& method, bool want_constructor) { 1774 if (want_constructor) { 1775 return (method->is_initializer() && !method->is_static()); 1776 } else { 1777 return (!method->is_initializer() && !method->is_overpass()); 1778 } 1779 } 1780 1781 static jobjectArray get_class_declared_methods_helper( 1782 JNIEnv *env, 1783 jclass ofClass, jboolean publicOnly, 1784 bool want_constructor, 1785 Klass* klass, TRAPS) { 1786 1787 JvmtiVMObjectAllocEventCollector oam; 1788 1789 // Exclude primitive types and array types 1790 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1791 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1792 // Return empty array 1793 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1794 return (jobjectArray) JNIHandles::make_local(env, res); 1795 } 1796 1797 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1798 1799 // Ensure class is linked 1800 k->link_class(CHECK_NULL); 1801 1802 Array<Method*>* methods = k->methods(); 1803 int methods_length = methods->length(); 1804 1805 // Save original method_idnum in case of redefinition, which can change 1806 // the idnum of obsolete methods. The new method will have the same idnum 1807 // but if we refresh the methods array, the counts will be wrong. 1808 ResourceMark rm(THREAD); 1809 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1810 int num_methods = 0; 1811 1812 for (int i = 0; i < methods_length; i++) { 1813 methodHandle method(THREAD, methods->at(i)); 1814 if (select_method(method, want_constructor)) { 1815 if (!publicOnly || method->is_public()) { 1816 idnums->push(method->method_idnum()); 1817 ++num_methods; 1818 } 1819 } 1820 } 1821 1822 // Allocate result 1823 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1824 objArrayHandle result (THREAD, r); 1825 1826 // Now just put the methods that we selected above, but go by their idnum 1827 // in case of redefinition. The methods can be redefined at any safepoint, 1828 // so above when allocating the oop array and below when creating reflect 1829 // objects. 1830 for (int i = 0; i < num_methods; i++) { 1831 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1832 if (method.is_null()) { 1833 // Method may have been deleted and seems this API can handle null 1834 // Otherwise should probably put a method that throws NSME 1835 result->obj_at_put(i, NULL); 1836 } else { 1837 oop m; 1838 if (want_constructor) { 1839 m = Reflection::new_constructor(method, CHECK_NULL); 1840 } else { 1841 m = Reflection::new_method(method, false, CHECK_NULL); 1842 } 1843 result->obj_at_put(i, m); 1844 } 1845 } 1846 1847 return (jobjectArray) JNIHandles::make_local(env, result()); 1848 } 1849 1850 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1851 { 1852 JVMWrapper("JVM_GetClassDeclaredMethods"); 1853 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1854 /*want_constructor*/ false, 1855 SystemDictionary::reflect_Method_klass(), THREAD); 1856 } 1857 JVM_END 1858 1859 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1860 { 1861 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1862 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1863 /*want_constructor*/ true, 1864 SystemDictionary::reflect_Constructor_klass(), THREAD); 1865 } 1866 JVM_END 1867 1868 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1869 { 1870 JVMWrapper("JVM_GetClassAccessFlags"); 1871 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1872 // Primitive type 1873 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1874 } 1875 1876 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1877 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1878 } 1879 JVM_END 1880 1881 1882 // Constant pool access ////////////////////////////////////////////////////////// 1883 1884 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1885 { 1886 JVMWrapper("JVM_GetClassConstantPool"); 1887 JvmtiVMObjectAllocEventCollector oam; 1888 1889 // Return null for primitives and arrays 1890 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1891 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1892 if (k->is_instance_klass()) { 1893 InstanceKlass* k_h = InstanceKlass::cast(k); 1894 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1895 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1896 return JNIHandles::make_local(jcp()); 1897 } 1898 } 1899 return NULL; 1900 } 1901 JVM_END 1902 1903 1904 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1905 { 1906 JVMWrapper("JVM_ConstantPoolGetSize"); 1907 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1908 return cp->length(); 1909 } 1910 JVM_END 1911 1912 1913 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1914 { 1915 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1916 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1917 bounds_check(cp, index, CHECK_NULL); 1918 constantTag tag = cp->tag_at(index); 1919 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1920 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1921 } 1922 Klass* k = cp->klass_at(index, CHECK_NULL); 1923 return (jclass) JNIHandles::make_local(k->java_mirror()); 1924 } 1925 JVM_END 1926 1927 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1928 { 1929 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1930 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1931 bounds_check(cp, index, CHECK_NULL); 1932 constantTag tag = cp->tag_at(index); 1933 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1934 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1935 } 1936 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1937 if (k == NULL) return NULL; 1938 return (jclass) JNIHandles::make_local(k->java_mirror()); 1939 } 1940 JVM_END 1941 1942 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 1943 constantTag tag = cp->tag_at(index); 1944 if (!tag.is_method() && !tag.is_interface_method()) { 1945 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1946 } 1947 int klass_ref = cp->uncached_klass_ref_index_at(index); 1948 Klass* k_o; 1949 if (force_resolution) { 1950 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1951 } else { 1952 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1953 if (k_o == NULL) return NULL; 1954 } 1955 InstanceKlass* k = InstanceKlass::cast(k_o); 1956 Symbol* name = cp->uncached_name_ref_at(index); 1957 Symbol* sig = cp->uncached_signature_ref_at(index); 1958 methodHandle m (THREAD, k->find_method(name, sig)); 1959 if (m.is_null()) { 1960 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1961 } 1962 oop method; 1963 if (!m->is_initializer() || m->is_static()) { 1964 method = Reflection::new_method(m, true, CHECK_NULL); 1965 } else { 1966 method = Reflection::new_constructor(m, CHECK_NULL); 1967 } 1968 return JNIHandles::make_local(method); 1969 } 1970 1971 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1972 { 1973 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1974 JvmtiVMObjectAllocEventCollector oam; 1975 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1976 bounds_check(cp, index, CHECK_NULL); 1977 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1978 return res; 1979 } 1980 JVM_END 1981 1982 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1983 { 1984 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 1985 JvmtiVMObjectAllocEventCollector oam; 1986 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1987 bounds_check(cp, index, CHECK_NULL); 1988 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 1989 return res; 1990 } 1991 JVM_END 1992 1993 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1994 constantTag tag = cp->tag_at(index); 1995 if (!tag.is_field()) { 1996 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1997 } 1998 int klass_ref = cp->uncached_klass_ref_index_at(index); 1999 Klass* k_o; 2000 if (force_resolution) { 2001 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2002 } else { 2003 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2004 if (k_o == NULL) return NULL; 2005 } 2006 InstanceKlass* k = InstanceKlass::cast(k_o); 2007 Symbol* name = cp->uncached_name_ref_at(index); 2008 Symbol* sig = cp->uncached_signature_ref_at(index); 2009 fieldDescriptor fd; 2010 Klass* target_klass = k->find_field(name, sig, &fd); 2011 if (target_klass == NULL) { 2012 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2013 } 2014 oop field = Reflection::new_field(&fd, CHECK_NULL); 2015 return JNIHandles::make_local(field); 2016 } 2017 2018 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2019 { 2020 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2021 JvmtiVMObjectAllocEventCollector oam; 2022 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2023 bounds_check(cp, index, CHECK_NULL); 2024 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2025 return res; 2026 } 2027 JVM_END 2028 2029 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2030 { 2031 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2032 JvmtiVMObjectAllocEventCollector oam; 2033 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2034 bounds_check(cp, index, CHECK_NULL); 2035 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2036 return res; 2037 } 2038 JVM_END 2039 2040 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2041 { 2042 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2043 JvmtiVMObjectAllocEventCollector oam; 2044 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2045 bounds_check(cp, index, CHECK_NULL); 2046 constantTag tag = cp->tag_at(index); 2047 if (!tag.is_field_or_method()) { 2048 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2049 } 2050 int klass_ref = cp->uncached_klass_ref_index_at(index); 2051 Symbol* klass_name = cp->klass_name_at(klass_ref); 2052 Symbol* member_name = cp->uncached_name_ref_at(index); 2053 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2054 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2055 objArrayHandle dest(THREAD, dest_o); 2056 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2057 dest->obj_at_put(0, str()); 2058 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2059 dest->obj_at_put(1, str()); 2060 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2061 dest->obj_at_put(2, str()); 2062 return (jobjectArray) JNIHandles::make_local(dest()); 2063 } 2064 JVM_END 2065 2066 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2067 { 2068 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2069 JvmtiVMObjectAllocEventCollector oam; 2070 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2071 bounds_check(cp, index, CHECK_0); 2072 constantTag tag = cp->tag_at(index); 2073 if (!tag.is_field_or_method()) { 2074 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2075 } 2076 return (jint) cp->uncached_klass_ref_index_at(index); 2077 } 2078 JVM_END 2079 2080 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2081 { 2082 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2083 JvmtiVMObjectAllocEventCollector oam; 2084 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2085 bounds_check(cp, index, CHECK_0); 2086 constantTag tag = cp->tag_at(index); 2087 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2088 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2089 } 2090 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2091 } 2092 JVM_END 2093 2094 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2095 { 2096 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2097 JvmtiVMObjectAllocEventCollector oam; 2098 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2099 bounds_check(cp, index, CHECK_NULL); 2100 constantTag tag = cp->tag_at(index); 2101 if (!tag.is_name_and_type()) { 2102 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2103 } 2104 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2105 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2106 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2107 objArrayHandle dest(THREAD, dest_o); 2108 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2109 dest->obj_at_put(0, str()); 2110 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2111 dest->obj_at_put(1, str()); 2112 return (jobjectArray) JNIHandles::make_local(dest()); 2113 } 2114 JVM_END 2115 2116 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2117 { 2118 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2119 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2120 bounds_check(cp, index, CHECK_0); 2121 constantTag tag = cp->tag_at(index); 2122 if (!tag.is_int()) { 2123 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2124 } 2125 return cp->int_at(index); 2126 } 2127 JVM_END 2128 2129 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2130 { 2131 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2132 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2133 bounds_check(cp, index, CHECK_(0L)); 2134 constantTag tag = cp->tag_at(index); 2135 if (!tag.is_long()) { 2136 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2137 } 2138 return cp->long_at(index); 2139 } 2140 JVM_END 2141 2142 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2143 { 2144 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2145 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2146 bounds_check(cp, index, CHECK_(0.0f)); 2147 constantTag tag = cp->tag_at(index); 2148 if (!tag.is_float()) { 2149 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2150 } 2151 return cp->float_at(index); 2152 } 2153 JVM_END 2154 2155 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2156 { 2157 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2158 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2159 bounds_check(cp, index, CHECK_(0.0)); 2160 constantTag tag = cp->tag_at(index); 2161 if (!tag.is_double()) { 2162 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2163 } 2164 return cp->double_at(index); 2165 } 2166 JVM_END 2167 2168 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2169 { 2170 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2171 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2172 bounds_check(cp, index, CHECK_NULL); 2173 constantTag tag = cp->tag_at(index); 2174 if (!tag.is_string()) { 2175 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2176 } 2177 oop str = cp->string_at(index, CHECK_NULL); 2178 return (jstring) JNIHandles::make_local(str); 2179 } 2180 JVM_END 2181 2182 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2183 { 2184 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2185 JvmtiVMObjectAllocEventCollector oam; 2186 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2187 bounds_check(cp, index, CHECK_NULL); 2188 constantTag tag = cp->tag_at(index); 2189 if (!tag.is_symbol()) { 2190 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2191 } 2192 Symbol* sym = cp->symbol_at(index); 2193 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2194 return (jstring) JNIHandles::make_local(str()); 2195 } 2196 JVM_END 2197 2198 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2199 { 2200 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2201 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2202 bounds_check(cp, index, CHECK_0); 2203 constantTag tag = cp->tag_at(index); 2204 jbyte result = tag.value(); 2205 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2206 // they are changed to the corresponding tags from the JVM spec, so that java code in 2207 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2208 if (tag.is_klass_or_reference()) { 2209 result = JVM_CONSTANT_Class; 2210 } else if (tag.is_string_index()) { 2211 result = JVM_CONSTANT_String; 2212 } else if (tag.is_method_type_in_error()) { 2213 result = JVM_CONSTANT_MethodType; 2214 } else if (tag.is_method_handle_in_error()) { 2215 result = JVM_CONSTANT_MethodHandle; 2216 } else if (tag.is_dynamic_constant_in_error()) { 2217 result = JVM_CONSTANT_Dynamic; 2218 } 2219 return result; 2220 } 2221 JVM_END 2222 2223 // Assertion support. ////////////////////////////////////////////////////////// 2224 2225 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2226 JVMWrapper("JVM_DesiredAssertionStatus"); 2227 assert(cls != NULL, "bad class"); 2228 2229 oop r = JNIHandles::resolve(cls); 2230 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2231 if (java_lang_Class::is_primitive(r)) return false; 2232 2233 Klass* k = java_lang_Class::as_Klass(r); 2234 assert(k->is_instance_klass(), "must be an instance klass"); 2235 if (!k->is_instance_klass()) return false; 2236 2237 ResourceMark rm(THREAD); 2238 const char* name = k->name()->as_C_string(); 2239 bool system_class = k->class_loader() == NULL; 2240 return JavaAssertions::enabled(name, system_class); 2241 2242 JVM_END 2243 2244 2245 // Return a new AssertionStatusDirectives object with the fields filled in with 2246 // command-line assertion arguments (i.e., -ea, -da). 2247 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2248 JVMWrapper("JVM_AssertionStatusDirectives"); 2249 JvmtiVMObjectAllocEventCollector oam; 2250 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2251 return JNIHandles::make_local(env, asd); 2252 JVM_END 2253 2254 // Arrays support ///////////////////////////////////////////////////////////// 2255 2256 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2257 JVMWrapper("JVM_ArrayIsAccessAtomic"); 2258 oop o = JNIHandles::resolve(array); 2259 Klass* k = o->klass(); 2260 if ((o == NULL) || (!k->is_array_klass())) { 2261 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2262 } 2263 if (k->is_valueArray_klass()) { 2264 return ValueArrayKlass::cast(k)->is_atomic(); 2265 } 2266 return true; 2267 JVM_END 2268 2269 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2270 JVMWrapper("JVM_ArrayEnsureAccessAtomic"); 2271 oop o = JNIHandles::resolve(array); 2272 Klass* k = o->klass(); 2273 if ((o == NULL) || (!k->is_array_klass())) { 2274 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2275 } 2276 if (k->is_valueArray_klass()) { 2277 ValueArrayKlass* vk = ValueArrayKlass::cast(k); 2278 if (!vk->is_atomic()) { 2279 /** 2280 * Need to decide how to implement: 2281 * 2282 * 1) Change to objArrayOop layout, therefore oop->klass() differs so 2283 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through 2284 * "checkcast" & "instanceof" 2285 * 2286 * 2) Use extra header in the valueArrayOop to flag atomicity required and 2287 * possibly per instance lock structure. Said info, could be placed in 2288 * "trailer" rather than disturb the current arrayOop 2289 */ 2290 Unimplemented(); 2291 } 2292 } 2293 return array; 2294 JVM_END 2295 2296 // Verification //////////////////////////////////////////////////////////////////////////////// 2297 2298 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2299 2300 // RedefineClasses support: bug 6214132 caused verification to fail. 2301 // All functions from this section should call the jvmtiThreadSate function: 2302 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2303 // The function returns a Klass* of the _scratch_class if the verifier 2304 // was invoked in the middle of the class redefinition. 2305 // Otherwise it returns its argument value which is the _the_class Klass*. 2306 // Please, refer to the description in the jvmtiThreadSate.hpp. 2307 2308 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2309 JVMWrapper("JVM_GetClassNameUTF"); 2310 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2311 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2312 return k->name()->as_utf8(); 2313 JVM_END 2314 2315 2316 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2317 JVMWrapper("JVM_GetClassCPTypes"); 2318 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2319 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2320 // types will have length zero if this is not an InstanceKlass 2321 // (length is determined by call to JVM_GetClassCPEntriesCount) 2322 if (k->is_instance_klass()) { 2323 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2324 for (int index = cp->length() - 1; index >= 0; index--) { 2325 constantTag tag = cp->tag_at(index); 2326 types[index] = tag.is_unresolved_klass() ? JVM_CONSTANT_Class : tag.value(); 2327 } 2328 } 2329 JVM_END 2330 2331 2332 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2333 JVMWrapper("JVM_GetClassCPEntriesCount"); 2334 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2335 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2336 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2337 JVM_END 2338 2339 2340 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2341 JVMWrapper("JVM_GetClassFieldsCount"); 2342 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2343 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2344 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2345 JVM_END 2346 2347 2348 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2349 JVMWrapper("JVM_GetClassMethodsCount"); 2350 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2351 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2352 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2353 JVM_END 2354 2355 2356 // The following methods, used for the verifier, are never called with 2357 // array klasses, so a direct cast to InstanceKlass is safe. 2358 // Typically, these methods are called in a loop with bounds determined 2359 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2360 // zero for arrays. 2361 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2362 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2363 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2364 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2365 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2366 int length = method->checked_exceptions_length(); 2367 if (length > 0) { 2368 CheckedExceptionElement* table= method->checked_exceptions_start(); 2369 for (int i = 0; i < length; i++) { 2370 exceptions[i] = table[i].class_cp_index; 2371 } 2372 } 2373 JVM_END 2374 2375 2376 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2377 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2378 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2379 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2380 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2381 return method->checked_exceptions_length(); 2382 JVM_END 2383 2384 2385 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2386 JVMWrapper("JVM_GetMethodIxByteCode"); 2387 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2388 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2389 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2390 memcpy(code, method->code_base(), method->code_size()); 2391 JVM_END 2392 2393 2394 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2395 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2396 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2397 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2398 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2399 return method->code_size(); 2400 JVM_END 2401 2402 2403 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2404 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2405 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2406 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2407 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2408 ExceptionTable extable(method); 2409 entry->start_pc = extable.start_pc(entry_index); 2410 entry->end_pc = extable.end_pc(entry_index); 2411 entry->handler_pc = extable.handler_pc(entry_index); 2412 entry->catchType = extable.catch_type_index(entry_index); 2413 JVM_END 2414 2415 2416 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2417 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2418 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2419 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2420 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2421 return method->exception_table_length(); 2422 JVM_END 2423 2424 2425 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2426 JVMWrapper("JVM_GetMethodIxModifiers"); 2427 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2428 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2429 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2430 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2431 JVM_END 2432 2433 2434 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2435 JVMWrapper("JVM_GetFieldIxModifiers"); 2436 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2437 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2438 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2439 JVM_END 2440 2441 2442 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2443 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2444 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2445 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2446 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2447 return method->max_locals(); 2448 JVM_END 2449 2450 2451 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2452 JVMWrapper("JVM_GetMethodIxArgsSize"); 2453 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2454 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2455 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2456 return method->size_of_parameters(); 2457 JVM_END 2458 2459 2460 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2461 JVMWrapper("JVM_GetMethodIxMaxStack"); 2462 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2463 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2464 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2465 return method->verifier_max_stack(); 2466 JVM_END 2467 2468 2469 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2470 JVMWrapper("JVM_IsConstructorIx"); 2471 ResourceMark rm(THREAD); 2472 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2473 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2474 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2475 return method->name() == vmSymbols::object_initializer_name(); 2476 JVM_END 2477 2478 2479 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2480 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2481 ResourceMark rm(THREAD); 2482 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2483 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2484 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2485 return method->is_overpass(); 2486 JVM_END 2487 2488 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2489 JVMWrapper("JVM_GetMethodIxIxUTF"); 2490 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2491 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2492 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2493 return method->name()->as_utf8(); 2494 JVM_END 2495 2496 2497 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2498 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2499 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2500 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2501 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2502 return method->signature()->as_utf8(); 2503 JVM_END 2504 2505 /** 2506 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2507 * read entries in the constant pool. Since the old verifier always 2508 * works on a copy of the code, it will not see any rewriting that 2509 * may possibly occur in the middle of verification. So it is important 2510 * that nothing it calls tries to use the cpCache instead of the raw 2511 * constant pool, so we must use cp->uncached_x methods when appropriate. 2512 */ 2513 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2514 JVMWrapper("JVM_GetCPFieldNameUTF"); 2515 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2516 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2517 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2518 switch (cp->tag_at(cp_index).value()) { 2519 case JVM_CONSTANT_Fieldref: 2520 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2521 default: 2522 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2523 } 2524 ShouldNotReachHere(); 2525 return NULL; 2526 JVM_END 2527 2528 2529 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2530 JVMWrapper("JVM_GetCPMethodNameUTF"); 2531 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2532 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2533 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2534 switch (cp->tag_at(cp_index).value()) { 2535 case JVM_CONSTANT_InterfaceMethodref: 2536 case JVM_CONSTANT_Methodref: 2537 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2538 default: 2539 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2540 } 2541 ShouldNotReachHere(); 2542 return NULL; 2543 JVM_END 2544 2545 2546 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2547 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2548 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2549 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2550 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2551 switch (cp->tag_at(cp_index).value()) { 2552 case JVM_CONSTANT_InterfaceMethodref: 2553 case JVM_CONSTANT_Methodref: 2554 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2555 default: 2556 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2557 } 2558 ShouldNotReachHere(); 2559 return NULL; 2560 JVM_END 2561 2562 2563 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2564 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2565 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2566 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2567 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2568 switch (cp->tag_at(cp_index).value()) { 2569 case JVM_CONSTANT_Fieldref: 2570 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2571 default: 2572 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2573 } 2574 ShouldNotReachHere(); 2575 return NULL; 2576 JVM_END 2577 2578 2579 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2580 JVMWrapper("JVM_GetCPClassNameUTF"); 2581 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2582 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2583 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2584 Symbol* classname = cp->klass_name_at(cp_index); 2585 return classname->as_utf8(); 2586 JVM_END 2587 2588 2589 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2590 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2591 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2592 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2593 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2594 switch (cp->tag_at(cp_index).value()) { 2595 case JVM_CONSTANT_Fieldref: { 2596 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2597 Symbol* classname = cp->klass_name_at(class_index); 2598 return classname->as_utf8(); 2599 } 2600 default: 2601 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2602 } 2603 ShouldNotReachHere(); 2604 return NULL; 2605 JVM_END 2606 2607 2608 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2609 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2610 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2611 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2612 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2613 switch (cp->tag_at(cp_index).value()) { 2614 case JVM_CONSTANT_Methodref: 2615 case JVM_CONSTANT_InterfaceMethodref: { 2616 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2617 Symbol* classname = cp->klass_name_at(class_index); 2618 return classname->as_utf8(); 2619 } 2620 default: 2621 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2622 } 2623 ShouldNotReachHere(); 2624 return NULL; 2625 JVM_END 2626 2627 2628 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2629 JVMWrapper("JVM_GetCPFieldModifiers"); 2630 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2631 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2632 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2633 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2634 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2635 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2636 switch (cp->tag_at(cp_index).value()) { 2637 case JVM_CONSTANT_Fieldref: { 2638 Symbol* name = cp->uncached_name_ref_at(cp_index); 2639 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2640 InstanceKlass* ik = InstanceKlass::cast(k_called); 2641 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2642 if (fs.name() == name && fs.signature() == signature) { 2643 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2644 } 2645 } 2646 return -1; 2647 } 2648 default: 2649 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2650 } 2651 ShouldNotReachHere(); 2652 return 0; 2653 JVM_END 2654 2655 2656 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2657 JVMWrapper("JVM_GetCPMethodModifiers"); 2658 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2659 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2660 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2661 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2662 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2663 switch (cp->tag_at(cp_index).value()) { 2664 case JVM_CONSTANT_Methodref: 2665 case JVM_CONSTANT_InterfaceMethodref: { 2666 Symbol* name = cp->uncached_name_ref_at(cp_index); 2667 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2668 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2669 int methods_count = methods->length(); 2670 for (int i = 0; i < methods_count; i++) { 2671 Method* method = methods->at(i); 2672 if (method->name() == name && method->signature() == signature) { 2673 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2674 } 2675 } 2676 return -1; 2677 } 2678 default: 2679 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2680 } 2681 ShouldNotReachHere(); 2682 return 0; 2683 JVM_END 2684 2685 2686 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2687 2688 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2689 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2690 JVM_END 2691 2692 2693 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2694 JVMWrapper("JVM_IsSameClassPackage"); 2695 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2696 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2697 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2698 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2699 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2700 JVM_END 2701 2702 // Printing support ////////////////////////////////////////////////// 2703 extern "C" { 2704 2705 ATTRIBUTE_PRINTF(3, 0) 2706 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2707 // see bug 4399518, 4417214 2708 if ((intptr_t)count <= 0) return -1; 2709 2710 int result = vsnprintf(str, count, fmt, args); 2711 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2712 // characters which would have been written had the buffer been large 2713 // enough; on Windows, it returns -1. We handle both cases here and 2714 // always return -1, and perform null termination. 2715 if ((result > 0 && (size_t)result >= count) || result == -1) { 2716 str[count - 1] = '\0'; 2717 result = -1; 2718 } 2719 2720 return result; 2721 } 2722 2723 ATTRIBUTE_PRINTF(3, 0) 2724 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2725 va_list args; 2726 int len; 2727 va_start(args, fmt); 2728 len = jio_vsnprintf(str, count, fmt, args); 2729 va_end(args); 2730 return len; 2731 } 2732 2733 ATTRIBUTE_PRINTF(2,3) 2734 int jio_fprintf(FILE* f, const char *fmt, ...) { 2735 int len; 2736 va_list args; 2737 va_start(args, fmt); 2738 len = jio_vfprintf(f, fmt, args); 2739 va_end(args); 2740 return len; 2741 } 2742 2743 ATTRIBUTE_PRINTF(2, 0) 2744 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2745 if (Arguments::vfprintf_hook() != NULL) { 2746 return Arguments::vfprintf_hook()(f, fmt, args); 2747 } else { 2748 return vfprintf(f, fmt, args); 2749 } 2750 } 2751 2752 ATTRIBUTE_PRINTF(1, 2) 2753 JNIEXPORT int jio_printf(const char *fmt, ...) { 2754 int len; 2755 va_list args; 2756 va_start(args, fmt); 2757 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2758 va_end(args); 2759 return len; 2760 } 2761 2762 2763 // HotSpot specific jio method 2764 void jio_print(const char* s) { 2765 // Try to make this function as atomic as possible. 2766 if (Arguments::vfprintf_hook() != NULL) { 2767 jio_fprintf(defaultStream::output_stream(), "%s", s); 2768 } else { 2769 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2770 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2771 } 2772 } 2773 2774 } // Extern C 2775 2776 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2777 2778 // In most of the JVM thread support functions we need to access the 2779 // thread through a ThreadsListHandle to prevent it from exiting and 2780 // being reclaimed while we try to operate on it. The exceptions to this 2781 // rule are when operating on the current thread, or if the monitor of 2782 // the target java.lang.Thread is locked at the Java level - in both 2783 // cases the target cannot exit. 2784 2785 static void thread_entry(JavaThread* thread, TRAPS) { 2786 HandleMark hm(THREAD); 2787 Handle obj(THREAD, thread->threadObj()); 2788 JavaValue result(T_VOID); 2789 JavaCalls::call_virtual(&result, 2790 obj, 2791 SystemDictionary::Thread_klass(), 2792 vmSymbols::run_method_name(), 2793 vmSymbols::void_method_signature(), 2794 THREAD); 2795 } 2796 2797 2798 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2799 JVMWrapper("JVM_StartThread"); 2800 JavaThread *native_thread = NULL; 2801 2802 // We cannot hold the Threads_lock when we throw an exception, 2803 // due to rank ordering issues. Example: we might need to grab the 2804 // Heap_lock while we construct the exception. 2805 bool throw_illegal_thread_state = false; 2806 2807 // We must release the Threads_lock before we can post a jvmti event 2808 // in Thread::start. 2809 { 2810 // Ensure that the C++ Thread and OSThread structures aren't freed before 2811 // we operate. 2812 MutexLocker mu(Threads_lock); 2813 2814 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2815 // re-starting an already started thread, so we should usually find 2816 // that the JavaThread is null. However for a JNI attached thread 2817 // there is a small window between the Thread object being created 2818 // (with its JavaThread set) and the update to its threadStatus, so we 2819 // have to check for this 2820 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2821 throw_illegal_thread_state = true; 2822 } else { 2823 // We could also check the stillborn flag to see if this thread was already stopped, but 2824 // for historical reasons we let the thread detect that itself when it starts running 2825 2826 jlong size = 2827 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2828 // Allocate the C++ Thread structure and create the native thread. The 2829 // stack size retrieved from java is 64-bit signed, but the constructor takes 2830 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2831 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2832 // - Avoid passing negative values which would result in really large stacks. 2833 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2834 size_t sz = size > 0 ? (size_t) size : 0; 2835 native_thread = new JavaThread(&thread_entry, sz); 2836 2837 // At this point it may be possible that no osthread was created for the 2838 // JavaThread due to lack of memory. Check for this situation and throw 2839 // an exception if necessary. Eventually we may want to change this so 2840 // that we only grab the lock if the thread was created successfully - 2841 // then we can also do this check and throw the exception in the 2842 // JavaThread constructor. 2843 if (native_thread->osthread() != NULL) { 2844 // Note: the current thread is not being used within "prepare". 2845 native_thread->prepare(jthread); 2846 } 2847 } 2848 } 2849 2850 if (throw_illegal_thread_state) { 2851 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2852 } 2853 2854 assert(native_thread != NULL, "Starting null thread?"); 2855 2856 if (native_thread->osthread() == NULL) { 2857 // No one should hold a reference to the 'native_thread'. 2858 native_thread->smr_delete(); 2859 if (JvmtiExport::should_post_resource_exhausted()) { 2860 JvmtiExport::post_resource_exhausted( 2861 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2862 os::native_thread_creation_failed_msg()); 2863 } 2864 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2865 os::native_thread_creation_failed_msg()); 2866 } 2867 2868 Thread::start(native_thread); 2869 2870 JVM_END 2871 2872 2873 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2874 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2875 // but is thought to be reliable and simple. In the case, where the receiver is the 2876 // same thread as the sender, no VM_Operation is needed. 2877 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2878 JVMWrapper("JVM_StopThread"); 2879 2880 // A nested ThreadsListHandle will grab the Threads_lock so create 2881 // tlh before we resolve throwable. 2882 ThreadsListHandle tlh(thread); 2883 oop java_throwable = JNIHandles::resolve(throwable); 2884 if (java_throwable == NULL) { 2885 THROW(vmSymbols::java_lang_NullPointerException()); 2886 } 2887 oop java_thread = NULL; 2888 JavaThread* receiver = NULL; 2889 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2890 Events::log_exception(thread, 2891 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2892 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2893 2894 if (is_alive) { 2895 // jthread refers to a live JavaThread. 2896 if (thread == receiver) { 2897 // Exception is getting thrown at self so no VM_Operation needed. 2898 THROW_OOP(java_throwable); 2899 } else { 2900 // Use a VM_Operation to throw the exception. 2901 Thread::send_async_exception(java_thread, java_throwable); 2902 } 2903 } else { 2904 // Either: 2905 // - target thread has not been started before being stopped, or 2906 // - target thread already terminated 2907 // We could read the threadStatus to determine which case it is 2908 // but that is overkill as it doesn't matter. We must set the 2909 // stillborn flag for the first case, and if the thread has already 2910 // exited setting this flag has no effect. 2911 java_lang_Thread::set_stillborn(java_thread); 2912 } 2913 JVM_END 2914 2915 2916 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2917 JVMWrapper("JVM_IsThreadAlive"); 2918 2919 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2920 return java_lang_Thread::is_alive(thread_oop); 2921 JVM_END 2922 2923 2924 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2925 JVMWrapper("JVM_SuspendThread"); 2926 2927 ThreadsListHandle tlh(thread); 2928 JavaThread* receiver = NULL; 2929 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2930 if (is_alive) { 2931 // jthread refers to a live JavaThread. 2932 { 2933 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2934 if (receiver->is_external_suspend()) { 2935 // Don't allow nested external suspend requests. We can't return 2936 // an error from this interface so just ignore the problem. 2937 return; 2938 } 2939 if (receiver->is_exiting()) { // thread is in the process of exiting 2940 return; 2941 } 2942 receiver->set_external_suspend(); 2943 } 2944 2945 // java_suspend() will catch threads in the process of exiting 2946 // and will ignore them. 2947 receiver->java_suspend(); 2948 2949 // It would be nice to have the following assertion in all the 2950 // time, but it is possible for a racing resume request to have 2951 // resumed this thread right after we suspended it. Temporarily 2952 // enable this assertion if you are chasing a different kind of 2953 // bug. 2954 // 2955 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2956 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2957 } 2958 JVM_END 2959 2960 2961 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2962 JVMWrapper("JVM_ResumeThread"); 2963 2964 ThreadsListHandle tlh(thread); 2965 JavaThread* receiver = NULL; 2966 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2967 if (is_alive) { 2968 // jthread refers to a live JavaThread. 2969 2970 // This is the original comment for this Threads_lock grab: 2971 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2972 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2973 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2974 // looks at it. 2975 // 2976 // The above comment dates back to when we had both internal and 2977 // external suspend APIs that shared a common underlying mechanism. 2978 // External suspend is now entirely cooperative and doesn't share 2979 // anything with internal suspend. That said, there are some 2980 // assumptions in the VM that an external resume grabs the 2981 // Threads_lock. We can't drop the Threads_lock grab here until we 2982 // resolve the assumptions that exist elsewhere. 2983 // 2984 MutexLocker ml(Threads_lock); 2985 receiver->java_resume(); 2986 } 2987 JVM_END 2988 2989 2990 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2991 JVMWrapper("JVM_SetThreadPriority"); 2992 2993 ThreadsListHandle tlh(thread); 2994 oop java_thread = NULL; 2995 JavaThread* receiver = NULL; 2996 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2997 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2998 2999 if (is_alive) { 3000 // jthread refers to a live JavaThread. 3001 Thread::set_priority(receiver, (ThreadPriority)prio); 3002 } 3003 // Implied else: If the JavaThread hasn't started yet, then the 3004 // priority set in the java.lang.Thread object above will be pushed 3005 // down when it does start. 3006 JVM_END 3007 3008 3009 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3010 JVMWrapper("JVM_Yield"); 3011 if (os::dont_yield()) return; 3012 HOTSPOT_THREAD_YIELD(); 3013 os::naked_yield(); 3014 JVM_END 3015 3016 3017 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3018 JVMWrapper("JVM_Sleep"); 3019 3020 if (millis < 0) { 3021 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3022 } 3023 3024 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 3025 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3026 } 3027 3028 // Save current thread state and restore it at the end of this block. 3029 // And set new thread state to SLEEPING. 3030 JavaThreadSleepState jtss(thread); 3031 3032 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3033 3034 EventThreadSleep event; 3035 3036 if (millis == 0) { 3037 os::naked_yield(); 3038 } else { 3039 ThreadState old_state = thread->osthread()->get_state(); 3040 thread->osthread()->set_state(SLEEPING); 3041 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3042 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3043 // us while we were sleeping. We do not overwrite those. 3044 if (!HAS_PENDING_EXCEPTION) { 3045 if (event.should_commit()) { 3046 event.set_time(millis); 3047 event.commit(); 3048 } 3049 HOTSPOT_THREAD_SLEEP_END(1); 3050 3051 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3052 // to properly restore the thread state. That's likely wrong. 3053 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3054 } 3055 } 3056 thread->osthread()->set_state(old_state); 3057 } 3058 if (event.should_commit()) { 3059 event.set_time(millis); 3060 event.commit(); 3061 } 3062 HOTSPOT_THREAD_SLEEP_END(0); 3063 JVM_END 3064 3065 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3066 JVMWrapper("JVM_CurrentThread"); 3067 oop jthread = thread->threadObj(); 3068 assert (thread != NULL, "no current thread!"); 3069 return JNIHandles::make_local(env, jthread); 3070 JVM_END 3071 3072 3073 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3074 JVMWrapper("JVM_CountStackFrames"); 3075 3076 uint32_t debug_bits = 0; 3077 ThreadsListHandle tlh(thread); 3078 JavaThread* receiver = NULL; 3079 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3080 int count = 0; 3081 if (is_alive) { 3082 // jthread refers to a live JavaThread. 3083 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) { 3084 // Count all java activation, i.e., number of vframes. 3085 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) { 3086 // Native frames are not counted. 3087 if (!vfst.method()->is_native()) count++; 3088 } 3089 } else { 3090 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3091 "this thread is not suspended"); 3092 } 3093 } 3094 // Implied else: if JavaThread is not alive simply return a count of 0. 3095 3096 return count; 3097 JVM_END 3098 3099 3100 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3101 JVMWrapper("JVM_Interrupt"); 3102 3103 ThreadsListHandle tlh(thread); 3104 JavaThread* receiver = NULL; 3105 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3106 if (is_alive) { 3107 // jthread refers to a live JavaThread. 3108 Thread::interrupt(receiver); 3109 } 3110 JVM_END 3111 3112 3113 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3114 JVMWrapper("JVM_IsInterrupted"); 3115 3116 ThreadsListHandle tlh(thread); 3117 JavaThread* receiver = NULL; 3118 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3119 if (is_alive) { 3120 // jthread refers to a live JavaThread. 3121 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0); 3122 } else { 3123 return JNI_FALSE; 3124 } 3125 JVM_END 3126 3127 3128 // Return true iff the current thread has locked the object passed in 3129 3130 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3131 JVMWrapper("JVM_HoldsLock"); 3132 assert(THREAD->is_Java_thread(), "sanity check"); 3133 if (obj == NULL) { 3134 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3135 } 3136 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3137 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3138 JVM_END 3139 3140 3141 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3142 JVMWrapper("JVM_DumpAllStacks"); 3143 VM_PrintThreads op; 3144 VMThread::execute(&op); 3145 if (JvmtiExport::should_post_data_dump()) { 3146 JvmtiExport::post_data_dump(); 3147 } 3148 JVM_END 3149 3150 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3151 JVMWrapper("JVM_SetNativeThreadName"); 3152 3153 // We don't use a ThreadsListHandle here because the current thread 3154 // must be alive. 3155 oop java_thread = JNIHandles::resolve_non_null(jthread); 3156 JavaThread* thr = java_lang_Thread::thread(java_thread); 3157 if (thread == thr && !thr->has_attached_via_jni()) { 3158 // Thread naming is only supported for the current thread and 3159 // we don't set the name of an attached thread to avoid stepping 3160 // on other programs. 3161 ResourceMark rm(thread); 3162 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3163 os::set_native_thread_name(thread_name); 3164 } 3165 JVM_END 3166 3167 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3168 3169 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3170 JVMWrapper("JVM_GetClassContext"); 3171 ResourceMark rm(THREAD); 3172 JvmtiVMObjectAllocEventCollector oam; 3173 vframeStream vfst(thread); 3174 3175 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3176 // This must only be called from SecurityManager.getClassContext 3177 Method* m = vfst.method(); 3178 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3179 m->name() == vmSymbols::getClassContext_name() && 3180 m->signature() == vmSymbols::void_class_array_signature())) { 3181 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3182 } 3183 } 3184 3185 // Collect method holders 3186 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3187 for (; !vfst.at_end(); vfst.security_next()) { 3188 Method* m = vfst.method(); 3189 // Native frames are not returned 3190 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3191 Klass* holder = m->method_holder(); 3192 assert(holder->is_klass(), "just checking"); 3193 klass_array->append(holder); 3194 } 3195 } 3196 3197 // Create result array of type [Ljava/lang/Class; 3198 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3199 // Fill in mirrors corresponding to method holders 3200 for (int i = 0; i < klass_array->length(); i++) { 3201 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3202 } 3203 3204 return (jobjectArray) JNIHandles::make_local(env, result); 3205 JVM_END 3206 3207 3208 // java.lang.Package //////////////////////////////////////////////////////////////// 3209 3210 3211 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3212 JVMWrapper("JVM_GetSystemPackage"); 3213 ResourceMark rm(THREAD); 3214 JvmtiVMObjectAllocEventCollector oam; 3215 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3216 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3217 return (jstring) JNIHandles::make_local(result); 3218 JVM_END 3219 3220 3221 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3222 JVMWrapper("JVM_GetSystemPackages"); 3223 JvmtiVMObjectAllocEventCollector oam; 3224 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3225 return (jobjectArray) JNIHandles::make_local(result); 3226 JVM_END 3227 3228 3229 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3230 3231 3232 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3233 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3234 3235 MonitorLockerEx ml(Heap_lock); 3236 oop ref = Universe::reference_pending_list(); 3237 if (ref != NULL) { 3238 Universe::set_reference_pending_list(NULL); 3239 } 3240 return JNIHandles::make_local(env, ref); 3241 JVM_END 3242 3243 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3244 JVMWrapper("JVM_HasReferencePendingList"); 3245 MonitorLockerEx ml(Heap_lock); 3246 return Universe::has_reference_pending_list(); 3247 JVM_END 3248 3249 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3250 JVMWrapper("JVM_WaitForReferencePendingList"); 3251 MonitorLockerEx ml(Heap_lock); 3252 while (!Universe::has_reference_pending_list()) { 3253 ml.wait(); 3254 } 3255 JVM_END 3256 3257 3258 // ObjectInputStream /////////////////////////////////////////////////////////////// 3259 3260 // Return the first user-defined class loader up the execution stack, or null 3261 // if only code from the bootstrap or platform class loader is on the stack. 3262 3263 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3264 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3265 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3266 oop loader = vfst.method()->method_holder()->class_loader(); 3267 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3268 return JNIHandles::make_local(env, loader); 3269 } 3270 } 3271 return NULL; 3272 JVM_END 3273 3274 3275 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3276 3277 3278 // resolve array handle and check arguments 3279 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3280 if (arr == NULL) { 3281 THROW_0(vmSymbols::java_lang_NullPointerException()); 3282 } 3283 oop a = JNIHandles::resolve_non_null(arr); 3284 if (!a->is_array()) { 3285 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3286 } else if (type_array_only && !a->is_typeArray()) { 3287 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3288 } 3289 return arrayOop(a); 3290 } 3291 3292 3293 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3294 JVMWrapper("JVM_GetArrayLength"); 3295 arrayOop a = check_array(env, arr, false, CHECK_0); 3296 return a->length(); 3297 JVM_END 3298 3299 3300 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3301 JVMWrapper("JVM_Array_Get"); 3302 JvmtiVMObjectAllocEventCollector oam; 3303 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3304 jvalue value; 3305 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3306 oop box = Reflection::box(&value, type, CHECK_NULL); 3307 return JNIHandles::make_local(env, box); 3308 JVM_END 3309 3310 3311 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3312 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3313 jvalue value; 3314 value.i = 0; // to initialize value before getting used in CHECK 3315 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3316 assert(a->is_typeArray(), "just checking"); 3317 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3318 BasicType wide_type = (BasicType) wCode; 3319 if (type != wide_type) { 3320 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3321 } 3322 return value; 3323 JVM_END 3324 3325 3326 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3327 JVMWrapper("JVM_SetArrayElement"); 3328 arrayOop a = check_array(env, arr, false, CHECK); 3329 oop box = JNIHandles::resolve(val); 3330 jvalue value; 3331 value.i = 0; // to initialize value before getting used in CHECK 3332 BasicType value_type; 3333 if (a->is_objArray()) { 3334 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3335 value_type = Reflection::unbox_for_regular_object(box, &value); 3336 } else { 3337 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3338 } 3339 Reflection::array_set(&value, a, index, value_type, CHECK); 3340 JVM_END 3341 3342 3343 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3344 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3345 arrayOop a = check_array(env, arr, true, CHECK); 3346 assert(a->is_typeArray(), "just checking"); 3347 BasicType value_type = (BasicType) vCode; 3348 Reflection::array_set(&v, a, index, value_type, CHECK); 3349 JVM_END 3350 3351 3352 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3353 JVMWrapper("JVM_NewArray"); 3354 JvmtiVMObjectAllocEventCollector oam; 3355 oop element_mirror = JNIHandles::resolve(eltClass); 3356 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3357 return JNIHandles::make_local(env, result); 3358 JVM_END 3359 3360 3361 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3362 JVMWrapper("JVM_NewMultiArray"); 3363 JvmtiVMObjectAllocEventCollector oam; 3364 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3365 oop element_mirror = JNIHandles::resolve(eltClass); 3366 assert(dim_array->is_typeArray(), "just checking"); 3367 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3368 return JNIHandles::make_local(env, result); 3369 JVM_END 3370 3371 3372 // Library support /////////////////////////////////////////////////////////////////////////// 3373 3374 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3375 //%note jvm_ct 3376 JVMWrapper("JVM_LoadLibrary"); 3377 char ebuf[1024]; 3378 void *load_result; 3379 { 3380 ThreadToNativeFromVM ttnfvm(thread); 3381 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3382 } 3383 if (load_result == NULL) { 3384 char msg[1024]; 3385 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3386 // Since 'ebuf' may contain a string encoded using 3387 // platform encoding scheme, we need to pass 3388 // Exceptions::unsafe_to_utf8 to the new_exception method 3389 // as the last argument. See bug 6367357. 3390 Handle h_exception = 3391 Exceptions::new_exception(thread, 3392 vmSymbols::java_lang_UnsatisfiedLinkError(), 3393 msg, Exceptions::unsafe_to_utf8); 3394 3395 THROW_HANDLE_0(h_exception); 3396 } 3397 return load_result; 3398 JVM_END 3399 3400 3401 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3402 JVMWrapper("JVM_UnloadLibrary"); 3403 os::dll_unload(handle); 3404 JVM_END 3405 3406 3407 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3408 JVMWrapper("JVM_FindLibraryEntry"); 3409 return os::dll_lookup(handle, name); 3410 JVM_END 3411 3412 3413 // JNI version /////////////////////////////////////////////////////////////////////////////// 3414 3415 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3416 JVMWrapper("JVM_IsSupportedJNIVersion"); 3417 return Threads::is_supported_jni_version_including_1_1(version); 3418 JVM_END 3419 3420 3421 // String support /////////////////////////////////////////////////////////////////////////// 3422 3423 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3424 JVMWrapper("JVM_InternString"); 3425 JvmtiVMObjectAllocEventCollector oam; 3426 if (str == NULL) return NULL; 3427 oop string = JNIHandles::resolve_non_null(str); 3428 oop result = StringTable::intern(string, CHECK_NULL); 3429 return (jstring) JNIHandles::make_local(env, result); 3430 JVM_END 3431 3432 3433 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3434 3435 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3436 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3437 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3438 // that only works with java threads. 3439 3440 3441 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3442 VM_Exit::block_if_vm_exited(); 3443 JVMWrapper("JVM_RawMonitorCreate"); 3444 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3445 } 3446 3447 3448 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3449 VM_Exit::block_if_vm_exited(); 3450 JVMWrapper("JVM_RawMonitorDestroy"); 3451 delete ((Mutex*) mon); 3452 } 3453 3454 3455 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3456 VM_Exit::block_if_vm_exited(); 3457 JVMWrapper("JVM_RawMonitorEnter"); 3458 ((Mutex*) mon)->jvm_raw_lock(); 3459 return 0; 3460 } 3461 3462 3463 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3464 VM_Exit::block_if_vm_exited(); 3465 JVMWrapper("JVM_RawMonitorExit"); 3466 ((Mutex*) mon)->jvm_raw_unlock(); 3467 } 3468 3469 3470 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3471 3472 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3473 Handle loader, Handle protection_domain, 3474 jboolean throwError, TRAPS) { 3475 // Security Note: 3476 // The Java level wrapper will perform the necessary security check allowing 3477 // us to pass the NULL as the initiating class loader. The VM is responsible for 3478 // the checkPackageAccess relative to the initiating class loader via the 3479 // protection_domain. The protection_domain is passed as NULL by the java code 3480 // if there is no security manager in 3-arg Class.forName(). 3481 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3482 3483 // Check if we should initialize the class 3484 if (init && klass->is_instance_klass()) { 3485 klass->initialize(CHECK_NULL); 3486 } 3487 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3488 } 3489 3490 3491 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3492 3493 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3494 JVMWrapper("JVM_InvokeMethod"); 3495 Handle method_handle; 3496 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3497 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3498 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3499 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3500 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3501 jobject res = JNIHandles::make_local(env, result); 3502 if (JvmtiExport::should_post_vm_object_alloc()) { 3503 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3504 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3505 if (java_lang_Class::is_primitive(ret_type)) { 3506 // Only for primitive type vm allocates memory for java object. 3507 // See box() method. 3508 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3509 } 3510 } 3511 return res; 3512 } else { 3513 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3514 } 3515 JVM_END 3516 3517 3518 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3519 JVMWrapper("JVM_NewInstanceFromConstructor"); 3520 oop constructor_mirror = JNIHandles::resolve(c); 3521 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3522 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3523 jobject res = JNIHandles::make_local(env, result); 3524 if (JvmtiExport::should_post_vm_object_alloc()) { 3525 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3526 } 3527 return res; 3528 JVM_END 3529 3530 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3531 3532 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3533 JVMWrapper("JVM_SupportsCX8"); 3534 return VM_Version::supports_cx8(); 3535 JVM_END 3536 3537 // Returns an array of all live Thread objects (VM internal JavaThreads, 3538 // jvmti agent threads, and JNI attaching threads are skipped) 3539 // See CR 6404306 regarding JNI attaching threads 3540 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3541 ResourceMark rm(THREAD); 3542 ThreadsListEnumerator tle(THREAD, false, false); 3543 JvmtiVMObjectAllocEventCollector oam; 3544 3545 int num_threads = tle.num_threads(); 3546 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3547 objArrayHandle threads_ah(THREAD, r); 3548 3549 for (int i = 0; i < num_threads; i++) { 3550 Handle h = tle.get_threadObj(i); 3551 threads_ah->obj_at_put(i, h()); 3552 } 3553 3554 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3555 JVM_END 3556 3557 3558 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3559 // Return StackTraceElement[][], each element is the stack trace of a thread in 3560 // the corresponding entry in the given threads array 3561 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3562 JVMWrapper("JVM_DumpThreads"); 3563 JvmtiVMObjectAllocEventCollector oam; 3564 3565 // Check if threads is null 3566 if (threads == NULL) { 3567 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3568 } 3569 3570 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3571 objArrayHandle ah(THREAD, a); 3572 int num_threads = ah->length(); 3573 // check if threads is non-empty array 3574 if (num_threads == 0) { 3575 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3576 } 3577 3578 // check if threads is not an array of objects of Thread class 3579 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3580 if (k != SystemDictionary::Thread_klass()) { 3581 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3582 } 3583 3584 ResourceMark rm(THREAD); 3585 3586 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3587 for (int i = 0; i < num_threads; i++) { 3588 oop thread_obj = ah->obj_at(i); 3589 instanceHandle h(THREAD, (instanceOop) thread_obj); 3590 thread_handle_array->append(h); 3591 } 3592 3593 // The JavaThread references in thread_handle_array are validated 3594 // in VM_ThreadDump::doit(). 3595 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3596 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3597 3598 JVM_END 3599 3600 // JVM monitoring and management support 3601 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3602 return Management::get_jmm_interface(version); 3603 JVM_END 3604 3605 // com.sun.tools.attach.VirtualMachine agent properties support 3606 // 3607 // Initialize the agent properties with the properties maintained in the VM 3608 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3609 JVMWrapper("JVM_InitAgentProperties"); 3610 ResourceMark rm; 3611 3612 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3613 3614 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3615 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3616 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3617 return properties; 3618 JVM_END 3619 3620 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3621 { 3622 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3623 JvmtiVMObjectAllocEventCollector oam; 3624 3625 if (ofClass == NULL) { 3626 return NULL; 3627 } 3628 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3629 // Special handling for primitive objects 3630 if (java_lang_Class::is_primitive(mirror())) { 3631 return NULL; 3632 } 3633 Klass* k = java_lang_Class::as_Klass(mirror()); 3634 if (!k->is_instance_klass()) { 3635 return NULL; 3636 } 3637 InstanceKlass* ik = InstanceKlass::cast(k); 3638 int encl_method_class_idx = ik->enclosing_method_class_index(); 3639 if (encl_method_class_idx == 0) { 3640 return NULL; 3641 } 3642 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3643 objArrayHandle dest(THREAD, dest_o); 3644 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3645 dest->obj_at_put(0, enc_k->java_mirror()); 3646 int encl_method_method_idx = ik->enclosing_method_method_index(); 3647 if (encl_method_method_idx != 0) { 3648 Symbol* sym = ik->constants()->symbol_at( 3649 extract_low_short_from_int( 3650 ik->constants()->name_and_type_at(encl_method_method_idx))); 3651 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3652 dest->obj_at_put(1, str()); 3653 sym = ik->constants()->symbol_at( 3654 extract_high_short_from_int( 3655 ik->constants()->name_and_type_at(encl_method_method_idx))); 3656 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3657 dest->obj_at_put(2, str()); 3658 } 3659 return (jobjectArray) JNIHandles::make_local(dest()); 3660 } 3661 JVM_END 3662 3663 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3664 { 3665 memset(info, 0, info_size); 3666 3667 info->jvm_version = Abstract_VM_Version::jvm_version(); 3668 info->patch_version = Abstract_VM_Version::vm_patch_version(); 3669 3670 // when we add a new capability in the jvm_version_info struct, we should also 3671 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3672 // counter defined in runtimeService.cpp. 3673 info->is_attach_supported = AttachListener::is_attach_supported(); 3674 } 3675 JVM_END 3676 3677 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3678 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3679 ResourceMark rm(THREAD); 3680 3681 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3682 return NULL; 3683 } 3684 3685 char** vm_flags = Arguments::jvm_flags_array(); 3686 char** vm_args = Arguments::jvm_args_array(); 3687 int num_flags = Arguments::num_jvm_flags(); 3688 int num_args = Arguments::num_jvm_args(); 3689 3690 InstanceKlass* ik = SystemDictionary::String_klass(); 3691 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3692 objArrayHandle result_h(THREAD, r); 3693 3694 int index = 0; 3695 for (int j = 0; j < num_flags; j++, index++) { 3696 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3697 result_h->obj_at_put(index, h()); 3698 } 3699 for (int i = 0; i < num_args; i++, index++) { 3700 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3701 result_h->obj_at_put(index, h()); 3702 } 3703 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3704 JVM_END 3705 3706 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3707 return os::get_signal_number(name); 3708 JVM_END