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 "jfr/jfrEvents.hpp" 41 #include "memory/oopFactory.hpp" 42 #include "memory/referenceType.hpp" 43 #include "memory/resourceArea.hpp" 44 #include "memory/universe.hpp" 45 #include "oops/access.inline.hpp" 46 #include "oops/fieldStreams.hpp" 47 #include "oops/instanceKlass.hpp" 48 #include "oops/method.hpp" 49 #include "oops/objArrayKlass.hpp" 50 #include "oops/objArrayOop.inline.hpp" 51 #include "oops/oop.inline.hpp" 52 #include "prims/jvm_misc.hpp" 53 #include "prims/jvmtiExport.hpp" 54 #include "prims/jvmtiThreadState.hpp" 55 #include "prims/nativeLookup.hpp" 56 #include "prims/privilegedStack.hpp" 57 #include "prims/stackwalk.hpp" 58 #include "runtime/arguments.hpp" 59 #include "runtime/atomic.hpp" 60 #include "runtime/handles.inline.hpp" 61 #include "runtime/init.hpp" 62 #include "runtime/interfaceSupport.inline.hpp" 63 #include "runtime/java.hpp" 64 #include "runtime/javaCalls.hpp" 65 #include "runtime/jfieldIDWorkaround.hpp" 66 #include "runtime/jniHandles.inline.hpp" 67 #include "runtime/orderAccess.hpp" 68 #include "runtime/os.inline.hpp" 69 #include "runtime/perfData.hpp" 70 #include "runtime/reflection.hpp" 71 #include "runtime/thread.inline.hpp" 72 #include "runtime/threadSMR.hpp" 73 #include "runtime/vframe.inline.hpp" 74 #include "runtime/vm_operations.hpp" 75 #include "runtime/vm_version.hpp" 76 #include "services/attachListener.hpp" 77 #include "services/management.hpp" 78 #include "services/threadService.hpp" 79 #include "utilities/copy.hpp" 80 #include "utilities/defaultStream.hpp" 81 #include "utilities/dtrace.hpp" 82 #include "utilities/events.hpp" 83 #include "utilities/histogram.hpp" 84 #include "utilities/macros.hpp" 85 #include "utilities/utf8.hpp" 86 #if INCLUDE_CDS 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::loadClass_name()) { 172 found_it = true; 173 } else if (!vfst.at_end()) { 174 if (vfst.method()->is_native()) { 175 // JNI call 176 found_it = true; 177 } 178 } 179 if (found_it && !vfst.at_end()) { 180 // found the caller 181 caller = vfst.method()->method_holder(); 182 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 183 if (line_number == -1) { 184 // show method name if it's a native method 185 trace = vfst.method()->name_and_sig_as_C_string(); 186 } 187 Symbol* s = caller->source_file_name(); 188 if (s != NULL) { 189 source_file = s->as_C_string(); 190 } 191 } 192 } 193 if (caller != NULL) { 194 if (to_class != caller) { 195 const char * from = caller->external_name(); 196 const char * to = to_class->external_name(); 197 // print in a single call to reduce interleaving between threads 198 if (source_file != NULL) { 199 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 200 } else { 201 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 202 } 203 } 204 } 205 } 206 207 void trace_class_resolution(Klass* to_class) { 208 EXCEPTION_MARK; 209 trace_class_resolution_impl(to_class, THREAD); 210 if (HAS_PENDING_EXCEPTION) { 211 CLEAR_PENDING_EXCEPTION; 212 } 213 } 214 215 // Wrapper to trace JVM functions 216 217 #ifdef ASSERT 218 Histogram* JVMHistogram; 219 volatile int JVMHistogram_lock = 0; 220 221 class JVMHistogramElement : public HistogramElement { 222 public: 223 JVMHistogramElement(const char* name); 224 }; 225 226 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 227 _name = elementName; 228 uintx count = 0; 229 230 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 231 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 232 count +=1; 233 if ( (WarnOnStalledSpinLock > 0) 234 && (count % WarnOnStalledSpinLock == 0)) { 235 warning("JVMHistogram_lock seems to be stalled"); 236 } 237 } 238 } 239 240 if(JVMHistogram == NULL) 241 JVMHistogram = new Histogram("JVM Call Counts",100); 242 243 JVMHistogram->add_element(this); 244 Atomic::dec(&JVMHistogram_lock); 245 } 246 247 #define JVMCountWrapper(arg) \ 248 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 249 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 250 251 #define JVMWrapper(arg) JVMCountWrapper(arg); 252 #else 253 #define JVMWrapper(arg) 254 #endif 255 256 257 // Interface version ///////////////////////////////////////////////////////////////////// 258 259 260 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 261 return JVM_INTERFACE_VERSION; 262 JVM_END 263 264 265 // java.lang.System ////////////////////////////////////////////////////////////////////// 266 267 268 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 269 JVMWrapper("JVM_CurrentTimeMillis"); 270 return os::javaTimeMillis(); 271 JVM_END 272 273 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 274 JVMWrapper("JVM_NanoTime"); 275 return os::javaTimeNanos(); 276 JVM_END 277 278 // The function below is actually exposed by jdk.internal.misc.VM and not 279 // java.lang.System, but we choose to keep it here so that it stays next 280 // to JVM_CurrentTimeMillis and JVM_NanoTime 281 282 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 283 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 284 285 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 286 JVMWrapper("JVM_GetNanoTimeAdjustment"); 287 jlong seconds; 288 jlong nanos; 289 290 os::javaTimeSystemUTC(seconds, nanos); 291 292 // We're going to verify that the result can fit in a long. 293 // For that we need the difference in seconds between 'seconds' 294 // and 'offset_secs' to be such that: 295 // |seconds - offset_secs| < (2^63/10^9) 296 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 297 // which makes |seconds - offset_secs| < 2^33 298 // and we will prefer +/- 2^32 as the maximum acceptable diff 299 // as 2^32 has a more natural feel than 2^33... 300 // 301 // So if |seconds - offset_secs| >= 2^32 - we return a special 302 // sentinel value (-1) which the caller should take as an 303 // exception value indicating that the offset given to us is 304 // too far from range of the current time - leading to too big 305 // a nano adjustment. The caller is expected to recover by 306 // computing a more accurate offset and calling this method 307 // again. (For the record 2^32 secs is ~136 years, so that 308 // should rarely happen) 309 // 310 jlong diff = seconds - offset_secs; 311 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 312 return -1; // sentinel value: the offset is too far off the target 313 } 314 315 // return the adjustment. If you compute a time by adding 316 // this number of nanoseconds along with the number of seconds 317 // in the offset you should get the current UTC time. 318 return (diff * (jlong)1000000000) + nanos; 319 JVM_END 320 321 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 322 jobject dst, jint dst_pos, jint length)) 323 JVMWrapper("JVM_ArrayCopy"); 324 // Check if we have null pointers 325 if (src == NULL || dst == NULL) { 326 THROW(vmSymbols::java_lang_NullPointerException()); 327 } 328 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 329 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 330 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 331 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 332 // Do copy 333 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 334 JVM_END 335 336 337 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 338 JavaValue r(T_OBJECT); 339 // public synchronized Object put(Object key, Object value); 340 HandleMark hm(THREAD); 341 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 342 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 343 JavaCalls::call_virtual(&r, 344 props, 345 SystemDictionary::Properties_klass(), 346 vmSymbols::put_name(), 347 vmSymbols::object_object_object_signature(), 348 key_str, 349 value_str, 350 THREAD); 351 } 352 353 354 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 355 356 357 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 358 JVMWrapper("JVM_InitProperties"); 359 ResourceMark rm; 360 361 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 362 363 // System property list includes both user set via -D option and 364 // jvm system specific properties. 365 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 366 PUTPROP(props, p->key(), p->value()); 367 } 368 369 // Convert the -XX:MaxDirectMemorySize= command line flag 370 // to the sun.nio.MaxDirectMemorySize property. 371 // Do this after setting user properties to prevent people 372 // from setting the value with a -D option, as requested. 373 { 374 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 375 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 376 } else { 377 char as_chars[256]; 378 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 379 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 380 } 381 } 382 383 // JVM monitoring and management support 384 // Add the sun.management.compiler property for the compiler's name 385 { 386 #undef CSIZE 387 #if defined(_LP64) || defined(_WIN64) 388 #define CSIZE "64-Bit " 389 #else 390 #define CSIZE 391 #endif // 64bit 392 393 #ifdef TIERED 394 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 395 #else 396 #if defined(COMPILER1) 397 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 398 #elif defined(COMPILER2) 399 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 400 #elif INCLUDE_JVMCI 401 #error "INCLUDE_JVMCI should imply TIERED" 402 #else 403 const char* compiler_name = ""; 404 #endif // compilers 405 #endif // TIERED 406 407 if (*compiler_name != '\0' && 408 (Arguments::mode() != Arguments::_int)) { 409 PUTPROP(props, "sun.management.compiler", compiler_name); 410 } 411 } 412 413 return properties; 414 JVM_END 415 416 417 /* 418 * Return the temporary directory that the VM uses for the attach 419 * and perf data files. 420 * 421 * It is important that this directory is well-known and the 422 * same for all VM instances. It cannot be affected by configuration 423 * variables such as java.io.tmpdir. 424 */ 425 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 426 JVMWrapper("JVM_GetTemporaryDirectory"); 427 HandleMark hm(THREAD); 428 const char* temp_dir = os::get_temp_directory(); 429 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 430 return (jstring) JNIHandles::make_local(env, h()); 431 JVM_END 432 433 434 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 435 436 extern volatile jint vm_created; 437 438 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 439 JVMWrapper("JVM_BeforeHalt"); 440 EventShutdown event; 441 if (event.should_commit()) { 442 event.set_reason("Shutdown requested from Java"); 443 event.commit(); 444 } 445 JVM_END 446 447 448 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 449 before_exit(thread); 450 vm_exit(code); 451 JVM_END 452 453 454 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 455 JVMWrapper("JVM_GC"); 456 if (!DisableExplicitGC) { 457 Universe::heap()->collect(GCCause::_java_lang_system_gc); 458 } 459 JVM_END 460 461 462 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 463 JVMWrapper("JVM_MaxObjectInspectionAge"); 464 return Universe::heap()->millis_since_last_gc(); 465 JVM_END 466 467 468 static inline jlong convert_size_t_to_jlong(size_t val) { 469 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 470 NOT_LP64 (return (jlong)val;) 471 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 472 } 473 474 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 475 JVMWrapper("JVM_TotalMemory"); 476 size_t n = Universe::heap()->capacity(); 477 return convert_size_t_to_jlong(n); 478 JVM_END 479 480 481 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 482 JVMWrapper("JVM_FreeMemory"); 483 CollectedHeap* ch = Universe::heap(); 484 size_t n; 485 { 486 MutexLocker x(Heap_lock); 487 n = ch->capacity() - ch->used(); 488 } 489 return convert_size_t_to_jlong(n); 490 JVM_END 491 492 493 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 494 JVMWrapper("JVM_MaxMemory"); 495 size_t n = Universe::heap()->max_capacity(); 496 return convert_size_t_to_jlong(n); 497 JVM_END 498 499 500 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 501 JVMWrapper("JVM_ActiveProcessorCount"); 502 return os::active_processor_count(); 503 JVM_END 504 505 506 507 // java.lang.Throwable ////////////////////////////////////////////////////// 508 509 510 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 511 JVMWrapper("JVM_FillInStackTrace"); 512 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 513 java_lang_Throwable::fill_in_stack_trace(exception); 514 JVM_END 515 516 517 // java.lang.StackTraceElement ////////////////////////////////////////////// 518 519 520 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 521 JVMWrapper("JVM_InitStackTraceElementArray"); 522 Handle exception(THREAD, JNIHandles::resolve(throwable)); 523 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 524 objArrayHandle stack_trace(THREAD, st); 525 // Fill in the allocated stack trace 526 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 527 JVM_END 528 529 530 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 531 JVMWrapper("JVM_InitStackTraceElement"); 532 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 533 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 534 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 535 JVM_END 536 537 538 // java.lang.StackWalker ////////////////////////////////////////////////////// 539 540 541 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 542 jint skip_frames, jint frame_count, jint start_index, 543 jobjectArray frames)) 544 JVMWrapper("JVM_CallStackWalk"); 545 JavaThread* jt = (JavaThread*) THREAD; 546 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 547 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 548 } 549 550 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 551 552 // frames array is a Class<?>[] array when only getting caller reference, 553 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 554 // be null. 555 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 556 objArrayHandle frames_array_h(THREAD, fa); 557 558 int limit = start_index + frame_count; 559 if (frames_array_h->length() < limit) { 560 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 561 } 562 563 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 564 start_index, frames_array_h, CHECK_NULL); 565 return JNIHandles::make_local(env, result); 566 JVM_END 567 568 569 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 570 jint frame_count, jint start_index, 571 jobjectArray frames)) 572 JVMWrapper("JVM_MoreStackWalk"); 573 JavaThread* jt = (JavaThread*) THREAD; 574 575 // frames array is a Class<?>[] array when only getting caller reference, 576 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 577 // be null. 578 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 579 objArrayHandle frames_array_h(THREAD, fa); 580 581 int limit = start_index+frame_count; 582 if (frames_array_h->length() < limit) { 583 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 584 } 585 586 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 587 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 588 start_index, frames_array_h, THREAD); 589 JVM_END 590 591 // java.lang.Object /////////////////////////////////////////////// 592 593 594 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 595 JVMWrapper("JVM_IHashCode"); 596 // as implemented in the classic virtual machine; return 0 if object is NULL 597 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 598 JVM_END 599 600 601 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 602 JVMWrapper("JVM_MonitorWait"); 603 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 604 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 605 if (JvmtiExport::should_post_monitor_wait()) { 606 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 607 608 // The current thread already owns the monitor and it has not yet 609 // been added to the wait queue so the current thread cannot be 610 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 611 // event handler cannot accidentally consume an unpark() meant for 612 // the ParkEvent associated with this ObjectMonitor. 613 } 614 ObjectSynchronizer::wait(obj, ms, CHECK); 615 JVM_END 616 617 618 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 619 JVMWrapper("JVM_MonitorNotify"); 620 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 621 ObjectSynchronizer::notify(obj, CHECK); 622 JVM_END 623 624 625 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 626 JVMWrapper("JVM_MonitorNotifyAll"); 627 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 628 ObjectSynchronizer::notifyall(obj, CHECK); 629 JVM_END 630 631 632 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 633 JVMWrapper("JVM_Clone"); 634 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 635 Klass* klass = obj->klass(); 636 JvmtiVMObjectAllocEventCollector oam; 637 638 #ifdef ASSERT 639 // Just checking that the cloneable flag is set correct 640 if (obj->is_array()) { 641 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 642 } else { 643 guarantee(obj->is_instance(), "should be instanceOop"); 644 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 645 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 646 } 647 #endif 648 649 // Check if class of obj supports the Cloneable interface. 650 // All arrays are considered to be cloneable (See JLS 20.1.5). 651 // All j.l.r.Reference classes are considered non-cloneable. 652 if (!klass->is_cloneable() || 653 (klass->is_instance_klass() && 654 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 655 ResourceMark rm(THREAD); 656 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 657 } 658 659 // Make shallow object copy 660 const int size = obj->size(); 661 oop new_obj_oop = NULL; 662 if (obj->is_array()) { 663 const int length = ((arrayOop)obj())->length(); 664 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 665 } else { 666 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 667 } 668 669 HeapAccess<>::clone(obj(), new_obj_oop, size); 670 671 Handle new_obj(THREAD, new_obj_oop); 672 // Caution: this involves a java upcall, so the clone should be 673 // "gc-robust" by this stage. 674 if (klass->has_finalizer()) { 675 assert(obj->is_instance(), "should be instanceOop"); 676 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 677 new_obj = Handle(THREAD, new_obj_oop); 678 } 679 680 return JNIHandles::make_local(env, new_obj()); 681 JVM_END 682 683 // java.io.File /////////////////////////////////////////////////////////////// 684 685 JVM_LEAF(char*, JVM_NativePath(char* path)) 686 JVMWrapper("JVM_NativePath"); 687 return os::native_path(path); 688 JVM_END 689 690 691 // Misc. class handling /////////////////////////////////////////////////////////// 692 693 694 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 695 JVMWrapper("JVM_GetCallerClass"); 696 697 // Getting the class of the caller frame. 698 // 699 // The call stack at this point looks something like this: 700 // 701 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 702 // [1] [ @CallerSensitive API.method ] 703 // [.] [ (skipped intermediate frames) ] 704 // [n] [ caller ] 705 vframeStream vfst(thread); 706 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 707 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 708 Method* m = vfst.method(); 709 assert(m != NULL, "sanity"); 710 switch (n) { 711 case 0: 712 // This must only be called from Reflection.getCallerClass 713 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 714 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 715 } 716 // fall-through 717 case 1: 718 // Frame 0 and 1 must be caller sensitive. 719 if (!m->caller_sensitive()) { 720 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 721 } 722 break; 723 default: 724 if (!m->is_ignored_by_security_stack_walk()) { 725 // We have reached the desired frame; return the holder class. 726 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 727 } 728 break; 729 } 730 } 731 return NULL; 732 JVM_END 733 734 735 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 736 JVMWrapper("JVM_FindPrimitiveClass"); 737 oop mirror = NULL; 738 BasicType t = name2type(utf); 739 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 740 mirror = Universe::java_mirror(t); 741 } 742 if (mirror == NULL) { 743 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 744 } else { 745 return (jclass) JNIHandles::make_local(env, mirror); 746 } 747 JVM_END 748 749 750 // Returns a class loaded by the bootstrap class loader; or null 751 // if not found. ClassNotFoundException is not thrown. 752 // FindClassFromBootLoader is exported to the launcher for windows. 753 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 754 const char* name)) 755 JVMWrapper("JVM_FindClassFromBootLoader"); 756 757 // Java libraries should ensure that name is never null... 758 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 759 // It's impossible to create this class; the name cannot fit 760 // into the constant pool. 761 return NULL; 762 } 763 764 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 765 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 766 if (k == NULL) { 767 return NULL; 768 } 769 770 if (log_is_enabled(Debug, class, resolve)) { 771 trace_class_resolution(k); 772 } 773 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 774 JVM_END 775 776 // Find a class with this name in this loader, using the caller's protection domain. 777 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 778 jboolean init, jobject loader, 779 jclass caller)) 780 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 781 // Java libraries should ensure that name is never null... 782 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 783 // It's impossible to create this class; the name cannot fit 784 // into the constant pool. 785 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 786 } 787 788 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 789 790 oop loader_oop = JNIHandles::resolve(loader); 791 oop from_class = JNIHandles::resolve(caller); 792 oop protection_domain = NULL; 793 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 794 // NPE. Put it in another way, the bootstrap class loader has all permission and 795 // thus no checkPackageAccess equivalence in the VM class loader. 796 // The caller is also passed as NULL by the java code if there is no security 797 // manager to avoid the performance cost of getting the calling class. 798 if (from_class != NULL && loader_oop != NULL) { 799 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 800 } 801 802 Handle h_loader(THREAD, loader_oop); 803 Handle h_prot(THREAD, protection_domain); 804 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 805 h_prot, false, THREAD); 806 807 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 808 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 809 } 810 return result; 811 JVM_END 812 813 // Currently only called from the old verifier. 814 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 815 jboolean init, jclass from)) 816 JVMWrapper("JVM_FindClassFromClass"); 817 if (name == NULL) { 818 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 819 } 820 if ((int)strlen(name) > Symbol::max_length()) { 821 // It's impossible to create this class; the name cannot fit 822 // into the constant pool. 823 Exceptions::fthrow(THREAD_AND_LOCATION, 824 vmSymbols::java_lang_NoClassDefFoundError(), 825 "Class name exceeds maximum length of %d: %s", 826 Symbol::max_length(), 827 name); 828 return 0; 829 } 830 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 831 oop from_class_oop = JNIHandles::resolve(from); 832 Klass* from_class = (from_class_oop == NULL) 833 ? (Klass*)NULL 834 : java_lang_Class::as_Klass(from_class_oop); 835 oop class_loader = NULL; 836 oop protection_domain = NULL; 837 if (from_class != NULL) { 838 class_loader = from_class->class_loader(); 839 protection_domain = from_class->protection_domain(); 840 } 841 Handle h_loader(THREAD, class_loader); 842 Handle h_prot (THREAD, protection_domain); 843 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 844 h_prot, true, thread); 845 if (result != NULL) { 846 oop mirror = JNIHandles::resolve_non_null(result); 847 Klass* to_class = java_lang_Class::as_Klass(mirror); 848 ClassLoaderData::class_loader_data(h_loader())->record_dependency(to_class); 849 } 850 851 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 852 // this function is generally only used for class loading during verification. 853 ResourceMark rm; 854 oop from_mirror = JNIHandles::resolve_non_null(from); 855 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 856 const char * from_name = from_class->external_name(); 857 858 oop mirror = JNIHandles::resolve_non_null(result); 859 Klass* to_class = java_lang_Class::as_Klass(mirror); 860 const char * to = to_class->external_name(); 861 log_debug(class, resolve)("%s %s (verification)", from_name, to); 862 } 863 864 return result; 865 JVM_END 866 867 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 868 if (loader.is_null()) { 869 return; 870 } 871 872 // check whether the current caller thread holds the lock or not. 873 // If not, increment the corresponding counter 874 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 875 ObjectSynchronizer::owner_self) { 876 counter->inc(); 877 } 878 } 879 880 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 881 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 882 jobject loader, const jbyte *buf, 883 jsize len, jobject pd, const char *source, 884 TRAPS) { 885 if (source == NULL) source = "__JVM_DefineClass__"; 886 887 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 888 JavaThread* jt = (JavaThread*) THREAD; 889 890 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 891 ClassLoader::perf_define_appclass_selftime(), 892 ClassLoader::perf_define_appclasses(), 893 jt->get_thread_stat()->perf_recursion_counts_addr(), 894 jt->get_thread_stat()->perf_timers_addr(), 895 PerfClassTraceTime::DEFINE_CLASS); 896 897 if (UsePerfData) { 898 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 899 } 900 901 // Since exceptions can be thrown, class initialization can take place 902 // if name is NULL no check for class name in .class stream has to be made. 903 TempNewSymbol class_name = NULL; 904 if (name != NULL) { 905 const int str_len = (int)strlen(name); 906 if (str_len > Symbol::max_length()) { 907 // It's impossible to create this class; the name cannot fit 908 // into the constant pool. 909 Exceptions::fthrow(THREAD_AND_LOCATION, 910 vmSymbols::java_lang_NoClassDefFoundError(), 911 "Class name exceeds maximum length of %d: %s", 912 Symbol::max_length(), 913 name); 914 return 0; 915 } 916 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 917 } 918 919 ResourceMark rm(THREAD); 920 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 921 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 922 if (UsePerfData) { 923 is_lock_held_by_thread(class_loader, 924 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 925 THREAD); 926 } 927 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 928 Klass* k = SystemDictionary::resolve_from_stream(class_name, 929 class_loader, 930 protection_domain, 931 &st, 932 CHECK_NULL); 933 934 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 935 trace_class_resolution(k); 936 } 937 938 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 939 } 940 941 942 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 943 JVMWrapper("JVM_DefineClass"); 944 945 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 946 JVM_END 947 948 949 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 950 JVMWrapper("JVM_DefineClassWithSource"); 951 952 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 953 JVM_END 954 955 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 956 JVMWrapper("JVM_FindLoadedClass"); 957 ResourceMark rm(THREAD); 958 959 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 960 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 961 962 const char* str = java_lang_String::as_utf8_string(string()); 963 // Sanity check, don't expect null 964 if (str == NULL) return NULL; 965 966 const int str_len = (int)strlen(str); 967 if (str_len > Symbol::max_length()) { 968 // It's impossible to create this class; the name cannot fit 969 // into the constant pool. 970 return NULL; 971 } 972 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 973 974 // Security Note: 975 // The Java level wrapper will perform the necessary security check allowing 976 // us to pass the NULL as the initiating class loader. 977 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 978 if (UsePerfData) { 979 is_lock_held_by_thread(h_loader, 980 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 981 THREAD); 982 } 983 984 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 985 h_loader, 986 Handle(), 987 CHECK_NULL); 988 #if INCLUDE_CDS 989 if (k == NULL) { 990 // If the class is not already loaded, try to see if it's in the shared 991 // archive for the current classloader (h_loader). 992 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 993 } 994 #endif 995 return (k == NULL) ? NULL : 996 (jclass) JNIHandles::make_local(env, k->java_mirror()); 997 JVM_END 998 999 // Module support ////////////////////////////////////////////////////////////////////////////// 1000 1001 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1002 jstring location, const char* const* packages, jsize num_packages)) 1003 JVMWrapper("JVM_DefineModule"); 1004 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1005 JVM_END 1006 1007 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1008 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1009 Modules::set_bootloader_unnamed_module(module, CHECK); 1010 JVM_END 1011 1012 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1013 JVMWrapper("JVM_AddModuleExports"); 1014 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1015 JVM_END 1016 1017 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1018 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1019 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1020 JVM_END 1021 1022 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1023 JVMWrapper("JVM_AddModuleExportsToAll"); 1024 Modules::add_module_exports(from_module, package, NULL, CHECK); 1025 JVM_END 1026 1027 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1028 JVMWrapper("JVM_AddReadsModule"); 1029 Modules::add_reads_module(from_module, source_module, CHECK); 1030 JVM_END 1031 1032 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1033 1034 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1035 assert (cls != NULL, "illegal class"); 1036 JVMWrapper("JVM_GetClassName"); 1037 JvmtiVMObjectAllocEventCollector oam; 1038 ResourceMark rm(THREAD); 1039 const char* name; 1040 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1041 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1042 } else { 1043 // Consider caching interned string in Klass 1044 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1045 assert(k->is_klass(), "just checking"); 1046 name = k->external_name(); 1047 } 1048 oop result = StringTable::intern((char*) name, CHECK_NULL); 1049 return (jstring) JNIHandles::make_local(env, result); 1050 JVM_END 1051 1052 1053 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1054 JVMWrapper("JVM_GetClassInterfaces"); 1055 JvmtiVMObjectAllocEventCollector oam; 1056 oop mirror = JNIHandles::resolve_non_null(cls); 1057 1058 // Special handling for primitive objects 1059 if (java_lang_Class::is_primitive(mirror)) { 1060 // Primitive objects does not have any interfaces 1061 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1062 return (jobjectArray) JNIHandles::make_local(env, r); 1063 } 1064 1065 Klass* klass = java_lang_Class::as_Klass(mirror); 1066 // Figure size of result array 1067 int size; 1068 if (klass->is_instance_klass()) { 1069 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1070 } else { 1071 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1072 size = 2; 1073 } 1074 1075 // Allocate result array 1076 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1077 objArrayHandle result (THREAD, r); 1078 // Fill in result 1079 if (klass->is_instance_klass()) { 1080 // Regular instance klass, fill in all local interfaces 1081 for (int index = 0; index < size; index++) { 1082 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1083 result->obj_at_put(index, k->java_mirror()); 1084 } 1085 } else { 1086 // All arrays implement java.lang.Cloneable and java.io.Serializable 1087 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1088 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1089 } 1090 return (jobjectArray) JNIHandles::make_local(env, result()); 1091 JVM_END 1092 1093 1094 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1095 JVMWrapper("JVM_IsInterface"); 1096 oop mirror = JNIHandles::resolve_non_null(cls); 1097 if (java_lang_Class::is_primitive(mirror)) { 1098 return JNI_FALSE; 1099 } 1100 Klass* k = java_lang_Class::as_Klass(mirror); 1101 jboolean result = k->is_interface(); 1102 assert(!result || k->is_instance_klass(), 1103 "all interfaces are instance types"); 1104 // The compiler intrinsic for isInterface tests the 1105 // Klass::_access_flags bits in the same way. 1106 return result; 1107 JVM_END 1108 1109 1110 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1111 JVMWrapper("JVM_GetClassSigners"); 1112 JvmtiVMObjectAllocEventCollector oam; 1113 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1114 // There are no signers for primitive types 1115 return NULL; 1116 } 1117 1118 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1119 1120 // If there are no signers set in the class, or if the class 1121 // is an array, return NULL. 1122 if (signers == NULL) return NULL; 1123 1124 // copy of the signers array 1125 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1126 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1127 for (int index = 0; index < signers->length(); index++) { 1128 signers_copy->obj_at_put(index, signers->obj_at(index)); 1129 } 1130 1131 // return the copy 1132 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1133 JVM_END 1134 1135 1136 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1137 JVMWrapper("JVM_SetClassSigners"); 1138 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1139 // This call is ignored for primitive types and arrays. 1140 // Signers are only set once, ClassLoader.java, and thus shouldn't 1141 // be called with an array. Only the bootstrap loader creates arrays. 1142 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1143 if (k->is_instance_klass()) { 1144 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1145 } 1146 } 1147 JVM_END 1148 1149 1150 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1151 JVMWrapper("JVM_GetProtectionDomain"); 1152 if (JNIHandles::resolve(cls) == NULL) { 1153 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1154 } 1155 1156 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1157 // Primitive types does not have a protection domain. 1158 return NULL; 1159 } 1160 1161 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1162 return (jobject) JNIHandles::make_local(env, pd); 1163 JVM_END 1164 1165 1166 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) { 1167 // If there is a security manager and protection domain, check the access 1168 // in the protection domain, otherwise it is authorized. 1169 if (java_lang_System::has_security_manager()) { 1170 1171 // For bootstrapping, if pd implies method isn't in the JDK, allow 1172 // this context to revert to older behavior. 1173 // In this case the isAuthorized field in AccessControlContext is also not 1174 // present. 1175 if (Universe::protection_domain_implies_method() == NULL) { 1176 return true; 1177 } 1178 1179 // Whitelist certain access control contexts 1180 if (java_security_AccessControlContext::is_authorized(context)) { 1181 return true; 1182 } 1183 1184 oop prot = klass->protection_domain(); 1185 if (prot != NULL) { 1186 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1187 // in the new wrapper. 1188 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1189 Handle h_prot(THREAD, prot); 1190 JavaValue result(T_BOOLEAN); 1191 JavaCallArguments args(h_prot); 1192 JavaCalls::call(&result, m, &args, CHECK_false); 1193 return (result.get_jboolean() != 0); 1194 } 1195 } 1196 return true; 1197 } 1198 1199 // Create an AccessControlContext with a protection domain with null codesource 1200 // and null permissions - which gives no permissions. 1201 oop create_dummy_access_control_context(TRAPS) { 1202 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1203 // Call constructor ProtectionDomain(null, null); 1204 Handle obj = JavaCalls::construct_new_instance(pd_klass, 1205 vmSymbols::codesource_permissioncollection_signature(), 1206 Handle(), Handle(), CHECK_NULL); 1207 1208 // new ProtectionDomain[] {pd}; 1209 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1210 context->obj_at_put(0, obj()); 1211 1212 // new AccessControlContext(new ProtectionDomain[] {pd}) 1213 objArrayHandle h_context(THREAD, context); 1214 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1215 return acc; 1216 } 1217 1218 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1219 JVMWrapper("JVM_DoPrivileged"); 1220 1221 if (action == NULL) { 1222 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1223 } 1224 1225 // Compute the frame initiating the do privileged operation and setup the privileged stack 1226 vframeStream vfst(thread); 1227 vfst.security_get_caller_frame(1); 1228 1229 if (vfst.at_end()) { 1230 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1231 } 1232 1233 Method* method = vfst.method(); 1234 InstanceKlass* klass = method->method_holder(); 1235 1236 // Check that action object understands "Object run()" 1237 Handle h_context; 1238 if (context != NULL) { 1239 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1240 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1241 if (!authorized) { 1242 // Create an unprivileged access control object and call it's run function 1243 // instead. 1244 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1245 h_context = Handle(THREAD, noprivs); 1246 } 1247 } 1248 1249 // Check that action object understands "Object run()" 1250 Handle object (THREAD, JNIHandles::resolve(action)); 1251 1252 // get run() method 1253 Method* m_oop = object->klass()->uncached_lookup_method( 1254 vmSymbols::run_method_name(), 1255 vmSymbols::void_object_signature(), 1256 Klass::find_overpass); 1257 1258 // See if there is a default method for "Object run()". 1259 if (m_oop == NULL && object->klass()->is_instance_klass()) { 1260 InstanceKlass* iklass = InstanceKlass::cast(object->klass()); 1261 m_oop = iklass->lookup_method_in_ordered_interfaces( 1262 vmSymbols::run_method_name(), 1263 vmSymbols::void_object_signature()); 1264 } 1265 1266 methodHandle m (THREAD, m_oop); 1267 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) { 1268 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1269 } 1270 1271 // Stack allocated list of privileged stack elements 1272 PrivilegedElement pi; 1273 if (!vfst.at_end()) { 1274 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1275 thread->set_privileged_stack_top(&pi); 1276 } 1277 1278 1279 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1280 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1281 Handle pending_exception; 1282 JavaValue result(T_OBJECT); 1283 JavaCallArguments args(object); 1284 JavaCalls::call(&result, m, &args, THREAD); 1285 1286 // done with action, remove ourselves from the list 1287 if (!vfst.at_end()) { 1288 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1289 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1290 } 1291 1292 if (HAS_PENDING_EXCEPTION) { 1293 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1294 CLEAR_PENDING_EXCEPTION; 1295 // JVMTI has already reported the pending exception 1296 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1297 if (THREAD->is_Java_thread()) { 1298 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1299 } 1300 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1301 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1302 // Throw a java.security.PrivilegedActionException(Exception e) exception 1303 JavaCallArguments args(pending_exception); 1304 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1305 vmSymbols::exception_void_signature(), 1306 &args); 1307 } 1308 } 1309 1310 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1311 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1312 JVM_END 1313 1314 1315 // Returns the inherited_access_control_context field of the running thread. 1316 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1317 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1318 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1319 return JNIHandles::make_local(env, result); 1320 JVM_END 1321 1322 class RegisterArrayForGC { 1323 private: 1324 JavaThread *_thread; 1325 public: 1326 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1327 _thread = thread; 1328 _thread->register_array_for_gc(array); 1329 } 1330 1331 ~RegisterArrayForGC() { 1332 _thread->register_array_for_gc(NULL); 1333 } 1334 }; 1335 1336 1337 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1338 JVMWrapper("JVM_GetStackAccessControlContext"); 1339 if (!UsePrivilegedStack) return NULL; 1340 1341 ResourceMark rm(THREAD); 1342 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1343 JvmtiVMObjectAllocEventCollector oam; 1344 1345 // count the protection domains on the execution stack. We collapse 1346 // duplicate consecutive protection domains into a single one, as 1347 // well as stopping when we hit a privileged frame. 1348 1349 // Use vframeStream to iterate through Java frames 1350 vframeStream vfst(thread); 1351 1352 oop previous_protection_domain = NULL; 1353 Handle privileged_context(thread, NULL); 1354 bool is_privileged = false; 1355 oop protection_domain = NULL; 1356 1357 for(; !vfst.at_end(); vfst.next()) { 1358 // get method of frame 1359 Method* method = vfst.method(); 1360 intptr_t* frame_id = vfst.frame_id(); 1361 1362 // check the privileged frames to see if we have a match 1363 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1364 // this frame is privileged 1365 is_privileged = true; 1366 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1367 protection_domain = thread->privileged_stack_top()->protection_domain(); 1368 } else { 1369 protection_domain = method->method_holder()->protection_domain(); 1370 } 1371 1372 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) { 1373 local_array->push(protection_domain); 1374 previous_protection_domain = protection_domain; 1375 } 1376 1377 if (is_privileged) break; 1378 } 1379 1380 1381 // either all the domains on the stack were system domains, or 1382 // we had a privileged system domain 1383 if (local_array->is_empty()) { 1384 if (is_privileged && privileged_context.is_null()) return NULL; 1385 1386 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1387 return JNIHandles::make_local(env, result); 1388 } 1389 1390 // the resource area must be registered in case of a gc 1391 RegisterArrayForGC ragc(thread, local_array); 1392 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1393 local_array->length(), CHECK_NULL); 1394 objArrayHandle h_context(thread, context); 1395 for (int index = 0; index < local_array->length(); index++) { 1396 h_context->obj_at_put(index, local_array->at(index)); 1397 } 1398 1399 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1400 1401 return JNIHandles::make_local(env, result); 1402 JVM_END 1403 1404 1405 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1406 JVMWrapper("JVM_IsArrayClass"); 1407 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1408 return (k != NULL) && k->is_array_klass() ? true : false; 1409 JVM_END 1410 1411 1412 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1413 JVMWrapper("JVM_IsPrimitiveClass"); 1414 oop mirror = JNIHandles::resolve_non_null(cls); 1415 return (jboolean) java_lang_Class::is_primitive(mirror); 1416 JVM_END 1417 1418 1419 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1420 JVMWrapper("JVM_GetClassModifiers"); 1421 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1422 // Primitive type 1423 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1424 } 1425 1426 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1427 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1428 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1429 return k->modifier_flags(); 1430 JVM_END 1431 1432 1433 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1434 1435 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1436 JvmtiVMObjectAllocEventCollector oam; 1437 // ofClass is a reference to a java_lang_Class object. The mirror object 1438 // of an InstanceKlass 1439 1440 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1441 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1442 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1443 return (jobjectArray)JNIHandles::make_local(env, result); 1444 } 1445 1446 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1447 InnerClassesIterator iter(k); 1448 1449 if (iter.length() == 0) { 1450 // Neither an inner nor outer class 1451 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1452 return (jobjectArray)JNIHandles::make_local(env, result); 1453 } 1454 1455 // find inner class info 1456 constantPoolHandle cp(thread, k->constants()); 1457 int length = iter.length(); 1458 1459 // Allocate temp. result array 1460 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1461 objArrayHandle result (THREAD, r); 1462 int members = 0; 1463 1464 for (; !iter.done(); iter.next()) { 1465 int ioff = iter.inner_class_info_index(); 1466 int ooff = iter.outer_class_info_index(); 1467 1468 if (ioff != 0 && ooff != 0) { 1469 // Check to see if the name matches the class we're looking for 1470 // before attempting to find the class. 1471 if (cp->klass_name_at_matches(k, ooff)) { 1472 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1473 if (outer_klass == k) { 1474 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1475 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1476 1477 // Throws an exception if outer klass has not declared k as 1478 // an inner klass 1479 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1480 1481 result->obj_at_put(members, inner_klass->java_mirror()); 1482 members++; 1483 } 1484 } 1485 } 1486 } 1487 1488 if (members != length) { 1489 // Return array of right length 1490 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1491 for(int i = 0; i < members; i++) { 1492 res->obj_at_put(i, result->obj_at(i)); 1493 } 1494 return (jobjectArray)JNIHandles::make_local(env, res); 1495 } 1496 1497 return (jobjectArray)JNIHandles::make_local(env, result()); 1498 JVM_END 1499 1500 1501 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1502 { 1503 // ofClass is a reference to a java_lang_Class object. 1504 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1505 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1506 return NULL; 1507 } 1508 1509 bool inner_is_member = false; 1510 Klass* outer_klass 1511 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1512 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1513 if (outer_klass == NULL) return NULL; // already a top-level class 1514 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1515 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1516 } 1517 JVM_END 1518 1519 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1520 { 1521 oop mirror = JNIHandles::resolve_non_null(cls); 1522 if (java_lang_Class::is_primitive(mirror) || 1523 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1524 return NULL; 1525 } 1526 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1527 int ooff = 0, noff = 0; 1528 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1529 if (noff != 0) { 1530 constantPoolHandle i_cp(thread, k->constants()); 1531 Symbol* name = i_cp->symbol_at(noff); 1532 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1533 return (jstring) JNIHandles::make_local(env, str()); 1534 } 1535 } 1536 return NULL; 1537 } 1538 JVM_END 1539 1540 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1541 assert (cls != NULL, "illegal class"); 1542 JVMWrapper("JVM_GetClassSignature"); 1543 JvmtiVMObjectAllocEventCollector oam; 1544 ResourceMark rm(THREAD); 1545 // Return null for arrays and primatives 1546 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1547 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1548 if (k->is_instance_klass()) { 1549 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1550 if (sym == NULL) return NULL; 1551 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1552 return (jstring) JNIHandles::make_local(env, str()); 1553 } 1554 } 1555 return NULL; 1556 JVM_END 1557 1558 1559 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1560 assert (cls != NULL, "illegal class"); 1561 JVMWrapper("JVM_GetClassAnnotations"); 1562 1563 // Return null for arrays and primitives 1564 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1565 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1566 if (k->is_instance_klass()) { 1567 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1568 return (jbyteArray) JNIHandles::make_local(env, a); 1569 } 1570 } 1571 return NULL; 1572 JVM_END 1573 1574 1575 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1576 // some of this code was adapted from from jni_FromReflectedField 1577 1578 oop reflected = JNIHandles::resolve_non_null(field); 1579 oop mirror = java_lang_reflect_Field::clazz(reflected); 1580 Klass* k = java_lang_Class::as_Klass(mirror); 1581 int slot = java_lang_reflect_Field::slot(reflected); 1582 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1583 1584 InstanceKlass* ik = InstanceKlass::cast(k); 1585 intptr_t offset = ik->field_offset(slot); 1586 1587 if (modifiers & JVM_ACC_STATIC) { 1588 // for static fields we only look in the current class 1589 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1590 assert(false, "cannot find static field"); 1591 return false; 1592 } 1593 } else { 1594 // for instance fields we start with the current class and work 1595 // our way up through the superclass chain 1596 if (!ik->find_field_from_offset(offset, false, &fd)) { 1597 assert(false, "cannot find instance field"); 1598 return false; 1599 } 1600 } 1601 return true; 1602 } 1603 1604 static Method* jvm_get_method_common(jobject method) { 1605 // some of this code was adapted from from jni_FromReflectedMethod 1606 1607 oop reflected = JNIHandles::resolve_non_null(method); 1608 oop mirror = NULL; 1609 int slot = 0; 1610 1611 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1612 mirror = java_lang_reflect_Constructor::clazz(reflected); 1613 slot = java_lang_reflect_Constructor::slot(reflected); 1614 } else { 1615 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1616 "wrong type"); 1617 mirror = java_lang_reflect_Method::clazz(reflected); 1618 slot = java_lang_reflect_Method::slot(reflected); 1619 } 1620 Klass* k = java_lang_Class::as_Klass(mirror); 1621 1622 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1623 assert(m != NULL, "cannot find method"); 1624 return m; // caller has to deal with NULL in product mode 1625 } 1626 1627 /* Type use annotations support (JDK 1.8) */ 1628 1629 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1630 assert (cls != NULL, "illegal class"); 1631 JVMWrapper("JVM_GetClassTypeAnnotations"); 1632 ResourceMark rm(THREAD); 1633 // Return null for arrays and primitives 1634 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1635 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1636 if (k->is_instance_klass()) { 1637 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1638 if (type_annotations != NULL) { 1639 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1640 return (jbyteArray) JNIHandles::make_local(env, a); 1641 } 1642 } 1643 } 1644 return NULL; 1645 JVM_END 1646 1647 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1648 assert (method != NULL, "illegal method"); 1649 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1650 1651 // method is a handle to a java.lang.reflect.Method object 1652 Method* m = jvm_get_method_common(method); 1653 if (m == NULL) { 1654 return NULL; 1655 } 1656 1657 AnnotationArray* type_annotations = m->type_annotations(); 1658 if (type_annotations != NULL) { 1659 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1660 return (jbyteArray) JNIHandles::make_local(env, a); 1661 } 1662 1663 return NULL; 1664 JVM_END 1665 1666 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1667 assert (field != NULL, "illegal field"); 1668 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1669 1670 fieldDescriptor fd; 1671 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1672 if (!gotFd) { 1673 return NULL; 1674 } 1675 1676 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1677 JVM_END 1678 1679 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1680 if (!cp->is_within_bounds(index)) { 1681 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1682 } 1683 } 1684 1685 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1686 { 1687 JVMWrapper("JVM_GetMethodParameters"); 1688 // method is a handle to a java.lang.reflect.Method object 1689 Method* method_ptr = jvm_get_method_common(method); 1690 methodHandle mh (THREAD, method_ptr); 1691 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1692 const int num_params = mh->method_parameters_length(); 1693 1694 if (num_params < 0) { 1695 // A -1 return value from method_parameters_length means there is no 1696 // parameter data. Return null to indicate this to the reflection 1697 // API. 1698 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1699 return (jobjectArray)NULL; 1700 } else { 1701 // Otherwise, we return something up to reflection, even if it is 1702 // a zero-length array. Why? Because in some cases this can 1703 // trigger a MalformedParametersException. 1704 1705 // make sure all the symbols are properly formatted 1706 for (int i = 0; i < num_params; i++) { 1707 MethodParametersElement* params = mh->method_parameters_start(); 1708 int index = params[i].name_cp_index; 1709 bounds_check(mh->constants(), index, CHECK_NULL); 1710 1711 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1712 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1713 "Wrong type at constant pool index"); 1714 } 1715 1716 } 1717 1718 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1719 objArrayHandle result (THREAD, result_oop); 1720 1721 for (int i = 0; i < num_params; i++) { 1722 MethodParametersElement* params = mh->method_parameters_start(); 1723 // For a 0 index, give a NULL symbol 1724 Symbol* sym = 0 != params[i].name_cp_index ? 1725 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1726 int flags = params[i].flags; 1727 oop param = Reflection::new_parameter(reflected_method, i, sym, 1728 flags, CHECK_NULL); 1729 result->obj_at_put(i, param); 1730 } 1731 return (jobjectArray)JNIHandles::make_local(env, result()); 1732 } 1733 } 1734 JVM_END 1735 1736 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1737 1738 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1739 { 1740 JVMWrapper("JVM_GetClassDeclaredFields"); 1741 JvmtiVMObjectAllocEventCollector oam; 1742 1743 // Exclude primitive types and array types 1744 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1745 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1746 // Return empty array 1747 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1748 return (jobjectArray) JNIHandles::make_local(env, res); 1749 } 1750 1751 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1752 constantPoolHandle cp(THREAD, k->constants()); 1753 1754 // Ensure class is linked 1755 k->link_class(CHECK_NULL); 1756 1757 // Allocate result 1758 int num_fields; 1759 1760 if (publicOnly) { 1761 num_fields = 0; 1762 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1763 if (fs.access_flags().is_public()) ++num_fields; 1764 } 1765 } else { 1766 num_fields = k->java_fields_count(); 1767 } 1768 1769 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1770 objArrayHandle result (THREAD, r); 1771 1772 int out_idx = 0; 1773 fieldDescriptor fd; 1774 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1775 if (!publicOnly || fs.access_flags().is_public()) { 1776 fd.reinitialize(k, fs.index()); 1777 oop field = Reflection::new_field(&fd, CHECK_NULL); 1778 result->obj_at_put(out_idx, field); 1779 ++out_idx; 1780 } 1781 } 1782 assert(out_idx == num_fields, "just checking"); 1783 return (jobjectArray) JNIHandles::make_local(env, result()); 1784 } 1785 JVM_END 1786 1787 static bool select_method(const methodHandle& method, bool want_constructor) { 1788 if (want_constructor) { 1789 return (method->is_initializer() && !method->is_static()); 1790 } else { 1791 return (!method->is_initializer() && !method->is_overpass()); 1792 } 1793 } 1794 1795 static jobjectArray get_class_declared_methods_helper( 1796 JNIEnv *env, 1797 jclass ofClass, jboolean publicOnly, 1798 bool want_constructor, 1799 Klass* klass, TRAPS) { 1800 1801 JvmtiVMObjectAllocEventCollector oam; 1802 1803 // Exclude primitive types and array types 1804 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1805 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1806 // Return empty array 1807 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1808 return (jobjectArray) JNIHandles::make_local(env, res); 1809 } 1810 1811 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1812 1813 // Ensure class is linked 1814 k->link_class(CHECK_NULL); 1815 1816 Array<Method*>* methods = k->methods(); 1817 int methods_length = methods->length(); 1818 1819 // Save original method_idnum in case of redefinition, which can change 1820 // the idnum of obsolete methods. The new method will have the same idnum 1821 // but if we refresh the methods array, the counts will be wrong. 1822 ResourceMark rm(THREAD); 1823 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1824 int num_methods = 0; 1825 1826 for (int i = 0; i < methods_length; i++) { 1827 methodHandle method(THREAD, methods->at(i)); 1828 if (select_method(method, want_constructor)) { 1829 if (!publicOnly || method->is_public()) { 1830 idnums->push(method->method_idnum()); 1831 ++num_methods; 1832 } 1833 } 1834 } 1835 1836 // Allocate result 1837 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1838 objArrayHandle result (THREAD, r); 1839 1840 // Now just put the methods that we selected above, but go by their idnum 1841 // in case of redefinition. The methods can be redefined at any safepoint, 1842 // so above when allocating the oop array and below when creating reflect 1843 // objects. 1844 for (int i = 0; i < num_methods; i++) { 1845 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1846 if (method.is_null()) { 1847 // Method may have been deleted and seems this API can handle null 1848 // Otherwise should probably put a method that throws NSME 1849 result->obj_at_put(i, NULL); 1850 } else { 1851 oop m; 1852 if (want_constructor) { 1853 m = Reflection::new_constructor(method, CHECK_NULL); 1854 } else { 1855 m = Reflection::new_method(method, false, CHECK_NULL); 1856 } 1857 result->obj_at_put(i, m); 1858 } 1859 } 1860 1861 return (jobjectArray) JNIHandles::make_local(env, result()); 1862 } 1863 1864 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1865 { 1866 JVMWrapper("JVM_GetClassDeclaredMethods"); 1867 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1868 /*want_constructor*/ false, 1869 SystemDictionary::reflect_Method_klass(), THREAD); 1870 } 1871 JVM_END 1872 1873 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1874 { 1875 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1876 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1877 /*want_constructor*/ true, 1878 SystemDictionary::reflect_Constructor_klass(), THREAD); 1879 } 1880 JVM_END 1881 1882 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1883 { 1884 JVMWrapper("JVM_GetClassAccessFlags"); 1885 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1886 // Primitive type 1887 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1888 } 1889 1890 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1891 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1892 } 1893 JVM_END 1894 1895 1896 // Constant pool access ////////////////////////////////////////////////////////// 1897 1898 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1899 { 1900 JVMWrapper("JVM_GetClassConstantPool"); 1901 JvmtiVMObjectAllocEventCollector oam; 1902 1903 // Return null for primitives and arrays 1904 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1905 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1906 if (k->is_instance_klass()) { 1907 InstanceKlass* k_h = InstanceKlass::cast(k); 1908 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1909 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1910 return JNIHandles::make_local(jcp()); 1911 } 1912 } 1913 return NULL; 1914 } 1915 JVM_END 1916 1917 1918 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1919 { 1920 JVMWrapper("JVM_ConstantPoolGetSize"); 1921 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1922 return cp->length(); 1923 } 1924 JVM_END 1925 1926 1927 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1928 { 1929 JVMWrapper("JVM_ConstantPoolGetClassAt"); 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 = cp->klass_at(index, CHECK_NULL); 1937 return (jclass) JNIHandles::make_local(k->java_mirror()); 1938 } 1939 JVM_END 1940 1941 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1942 { 1943 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1944 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1945 bounds_check(cp, index, CHECK_NULL); 1946 constantTag tag = cp->tag_at(index); 1947 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1948 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1949 } 1950 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1951 if (k == NULL) return NULL; 1952 return (jclass) JNIHandles::make_local(k->java_mirror()); 1953 } 1954 JVM_END 1955 1956 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 1957 constantTag tag = cp->tag_at(index); 1958 if (!tag.is_method() && !tag.is_interface_method()) { 1959 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1960 } 1961 int klass_ref = cp->uncached_klass_ref_index_at(index); 1962 Klass* k_o; 1963 if (force_resolution) { 1964 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1965 } else { 1966 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1967 if (k_o == NULL) return NULL; 1968 } 1969 InstanceKlass* k = InstanceKlass::cast(k_o); 1970 Symbol* name = cp->uncached_name_ref_at(index); 1971 Symbol* sig = cp->uncached_signature_ref_at(index); 1972 methodHandle m (THREAD, k->find_method(name, sig)); 1973 if (m.is_null()) { 1974 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1975 } 1976 oop method; 1977 if (!m->is_initializer() || m->is_static()) { 1978 method = Reflection::new_method(m, true, CHECK_NULL); 1979 } else { 1980 method = Reflection::new_constructor(m, CHECK_NULL); 1981 } 1982 return JNIHandles::make_local(method); 1983 } 1984 1985 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1986 { 1987 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1988 JvmtiVMObjectAllocEventCollector oam; 1989 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1990 bounds_check(cp, index, CHECK_NULL); 1991 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1992 return res; 1993 } 1994 JVM_END 1995 1996 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1997 { 1998 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 1999 JvmtiVMObjectAllocEventCollector oam; 2000 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2001 bounds_check(cp, index, CHECK_NULL); 2002 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2003 return res; 2004 } 2005 JVM_END 2006 2007 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2008 constantTag tag = cp->tag_at(index); 2009 if (!tag.is_field()) { 2010 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2011 } 2012 int klass_ref = cp->uncached_klass_ref_index_at(index); 2013 Klass* k_o; 2014 if (force_resolution) { 2015 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2016 } else { 2017 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2018 if (k_o == NULL) return NULL; 2019 } 2020 InstanceKlass* k = InstanceKlass::cast(k_o); 2021 Symbol* name = cp->uncached_name_ref_at(index); 2022 Symbol* sig = cp->uncached_signature_ref_at(index); 2023 fieldDescriptor fd; 2024 Klass* target_klass = k->find_field(name, sig, &fd); 2025 if (target_klass == NULL) { 2026 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2027 } 2028 oop field = Reflection::new_field(&fd, CHECK_NULL); 2029 return JNIHandles::make_local(field); 2030 } 2031 2032 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2033 { 2034 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2035 JvmtiVMObjectAllocEventCollector oam; 2036 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2037 bounds_check(cp, index, CHECK_NULL); 2038 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2039 return res; 2040 } 2041 JVM_END 2042 2043 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2044 { 2045 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2046 JvmtiVMObjectAllocEventCollector oam; 2047 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2048 bounds_check(cp, index, CHECK_NULL); 2049 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2050 return res; 2051 } 2052 JVM_END 2053 2054 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2055 { 2056 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2057 JvmtiVMObjectAllocEventCollector oam; 2058 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2059 bounds_check(cp, index, CHECK_NULL); 2060 constantTag tag = cp->tag_at(index); 2061 if (!tag.is_field_or_method()) { 2062 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2063 } 2064 int klass_ref = cp->uncached_klass_ref_index_at(index); 2065 Symbol* klass_name = cp->klass_name_at(klass_ref); 2066 Symbol* member_name = cp->uncached_name_ref_at(index); 2067 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2068 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2069 objArrayHandle dest(THREAD, dest_o); 2070 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2071 dest->obj_at_put(0, str()); 2072 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2073 dest->obj_at_put(1, str()); 2074 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2075 dest->obj_at_put(2, str()); 2076 return (jobjectArray) JNIHandles::make_local(dest()); 2077 } 2078 JVM_END 2079 2080 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2081 { 2082 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 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_field_or_method()) { 2088 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2089 } 2090 return (jint) cp->uncached_klass_ref_index_at(index); 2091 } 2092 JVM_END 2093 2094 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2095 { 2096 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2097 JvmtiVMObjectAllocEventCollector oam; 2098 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2099 bounds_check(cp, index, CHECK_0); 2100 constantTag tag = cp->tag_at(index); 2101 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2102 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2103 } 2104 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2105 } 2106 JVM_END 2107 2108 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2109 { 2110 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2111 JvmtiVMObjectAllocEventCollector oam; 2112 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2113 bounds_check(cp, index, CHECK_NULL); 2114 constantTag tag = cp->tag_at(index); 2115 if (!tag.is_name_and_type()) { 2116 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2117 } 2118 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2119 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2120 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2121 objArrayHandle dest(THREAD, dest_o); 2122 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2123 dest->obj_at_put(0, str()); 2124 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2125 dest->obj_at_put(1, str()); 2126 return (jobjectArray) JNIHandles::make_local(dest()); 2127 } 2128 JVM_END 2129 2130 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2131 { 2132 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2133 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2134 bounds_check(cp, index, CHECK_0); 2135 constantTag tag = cp->tag_at(index); 2136 if (!tag.is_int()) { 2137 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2138 } 2139 return cp->int_at(index); 2140 } 2141 JVM_END 2142 2143 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2144 { 2145 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2146 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2147 bounds_check(cp, index, CHECK_(0L)); 2148 constantTag tag = cp->tag_at(index); 2149 if (!tag.is_long()) { 2150 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2151 } 2152 return cp->long_at(index); 2153 } 2154 JVM_END 2155 2156 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2157 { 2158 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2159 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2160 bounds_check(cp, index, CHECK_(0.0f)); 2161 constantTag tag = cp->tag_at(index); 2162 if (!tag.is_float()) { 2163 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2164 } 2165 return cp->float_at(index); 2166 } 2167 JVM_END 2168 2169 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2170 { 2171 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2172 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2173 bounds_check(cp, index, CHECK_(0.0)); 2174 constantTag tag = cp->tag_at(index); 2175 if (!tag.is_double()) { 2176 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2177 } 2178 return cp->double_at(index); 2179 } 2180 JVM_END 2181 2182 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2183 { 2184 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2185 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2186 bounds_check(cp, index, CHECK_NULL); 2187 constantTag tag = cp->tag_at(index); 2188 if (!tag.is_string()) { 2189 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2190 } 2191 oop str = cp->string_at(index, CHECK_NULL); 2192 return (jstring) JNIHandles::make_local(str); 2193 } 2194 JVM_END 2195 2196 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2197 { 2198 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2199 JvmtiVMObjectAllocEventCollector oam; 2200 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2201 bounds_check(cp, index, CHECK_NULL); 2202 constantTag tag = cp->tag_at(index); 2203 if (!tag.is_symbol()) { 2204 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2205 } 2206 Symbol* sym = cp->symbol_at(index); 2207 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2208 return (jstring) JNIHandles::make_local(str()); 2209 } 2210 JVM_END 2211 2212 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2213 { 2214 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2215 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2216 bounds_check(cp, index, CHECK_0); 2217 constantTag tag = cp->tag_at(index); 2218 jbyte result = tag.value(); 2219 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2220 // they are changed to the corresponding tags from the JVM spec, so that java code in 2221 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2222 if (tag.is_klass_or_reference()) { 2223 result = JVM_CONSTANT_Class; 2224 } else if (tag.is_string_index()) { 2225 result = JVM_CONSTANT_String; 2226 } else if (tag.is_method_type_in_error()) { 2227 result = JVM_CONSTANT_MethodType; 2228 } else if (tag.is_method_handle_in_error()) { 2229 result = JVM_CONSTANT_MethodHandle; 2230 } else if (tag.is_dynamic_constant_in_error()) { 2231 result = JVM_CONSTANT_Dynamic; 2232 } 2233 return result; 2234 } 2235 JVM_END 2236 2237 // Assertion support. ////////////////////////////////////////////////////////// 2238 2239 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2240 JVMWrapper("JVM_DesiredAssertionStatus"); 2241 assert(cls != NULL, "bad class"); 2242 2243 oop r = JNIHandles::resolve(cls); 2244 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2245 if (java_lang_Class::is_primitive(r)) return false; 2246 2247 Klass* k = java_lang_Class::as_Klass(r); 2248 assert(k->is_instance_klass(), "must be an instance klass"); 2249 if (!k->is_instance_klass()) return false; 2250 2251 ResourceMark rm(THREAD); 2252 const char* name = k->name()->as_C_string(); 2253 bool system_class = k->class_loader() == NULL; 2254 return JavaAssertions::enabled(name, system_class); 2255 2256 JVM_END 2257 2258 2259 // Return a new AssertionStatusDirectives object with the fields filled in with 2260 // command-line assertion arguments (i.e., -ea, -da). 2261 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2262 JVMWrapper("JVM_AssertionStatusDirectives"); 2263 JvmtiVMObjectAllocEventCollector oam; 2264 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2265 return JNIHandles::make_local(env, asd); 2266 JVM_END 2267 2268 // Verification //////////////////////////////////////////////////////////////////////////////// 2269 2270 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2271 2272 // RedefineClasses support: bug 6214132 caused verification to fail. 2273 // All functions from this section should call the jvmtiThreadSate function: 2274 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2275 // The function returns a Klass* of the _scratch_class if the verifier 2276 // was invoked in the middle of the class redefinition. 2277 // Otherwise it returns its argument value which is the _the_class Klass*. 2278 // Please, refer to the description in the jvmtiThreadSate.hpp. 2279 2280 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2281 JVMWrapper("JVM_GetClassNameUTF"); 2282 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2283 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2284 return k->name()->as_utf8(); 2285 JVM_END 2286 2287 2288 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2289 JVMWrapper("JVM_GetClassCPTypes"); 2290 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2291 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2292 // types will have length zero if this is not an InstanceKlass 2293 // (length is determined by call to JVM_GetClassCPEntriesCount) 2294 if (k->is_instance_klass()) { 2295 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2296 for (int index = cp->length() - 1; index >= 0; index--) { 2297 constantTag tag = cp->tag_at(index); 2298 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2299 } 2300 } 2301 JVM_END 2302 2303 2304 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2305 JVMWrapper("JVM_GetClassCPEntriesCount"); 2306 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2307 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2308 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2309 JVM_END 2310 2311 2312 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2313 JVMWrapper("JVM_GetClassFieldsCount"); 2314 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2315 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2316 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2317 JVM_END 2318 2319 2320 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2321 JVMWrapper("JVM_GetClassMethodsCount"); 2322 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2323 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2324 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2325 JVM_END 2326 2327 2328 // The following methods, used for the verifier, are never called with 2329 // array klasses, so a direct cast to InstanceKlass is safe. 2330 // Typically, these methods are called in a loop with bounds determined 2331 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2332 // zero for arrays. 2333 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2334 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2335 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2336 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2337 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2338 int length = method->checked_exceptions_length(); 2339 if (length > 0) { 2340 CheckedExceptionElement* table= method->checked_exceptions_start(); 2341 for (int i = 0; i < length; i++) { 2342 exceptions[i] = table[i].class_cp_index; 2343 } 2344 } 2345 JVM_END 2346 2347 2348 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2349 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2350 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2351 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2352 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2353 return method->checked_exceptions_length(); 2354 JVM_END 2355 2356 2357 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2358 JVMWrapper("JVM_GetMethodIxByteCode"); 2359 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2360 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2361 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2362 memcpy(code, method->code_base(), method->code_size()); 2363 JVM_END 2364 2365 2366 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2367 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2368 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2369 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2370 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2371 return method->code_size(); 2372 JVM_END 2373 2374 2375 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2376 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2377 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2378 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2379 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2380 ExceptionTable extable(method); 2381 entry->start_pc = extable.start_pc(entry_index); 2382 entry->end_pc = extable.end_pc(entry_index); 2383 entry->handler_pc = extable.handler_pc(entry_index); 2384 entry->catchType = extable.catch_type_index(entry_index); 2385 JVM_END 2386 2387 2388 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2389 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2390 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2391 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2392 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2393 return method->exception_table_length(); 2394 JVM_END 2395 2396 2397 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2398 JVMWrapper("JVM_GetMethodIxModifiers"); 2399 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2400 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2401 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2402 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2403 JVM_END 2404 2405 2406 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2407 JVMWrapper("JVM_GetFieldIxModifiers"); 2408 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2409 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2410 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2411 JVM_END 2412 2413 2414 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2415 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2416 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2417 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2418 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2419 return method->max_locals(); 2420 JVM_END 2421 2422 2423 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2424 JVMWrapper("JVM_GetMethodIxArgsSize"); 2425 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2426 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2427 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2428 return method->size_of_parameters(); 2429 JVM_END 2430 2431 2432 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2433 JVMWrapper("JVM_GetMethodIxMaxStack"); 2434 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2435 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2436 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2437 return method->verifier_max_stack(); 2438 JVM_END 2439 2440 2441 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2442 JVMWrapper("JVM_IsConstructorIx"); 2443 ResourceMark rm(THREAD); 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->name() == vmSymbols::object_initializer_name(); 2448 JVM_END 2449 2450 2451 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2452 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2453 ResourceMark rm(THREAD); 2454 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2455 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2456 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2457 return method->is_overpass(); 2458 JVM_END 2459 2460 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2461 JVMWrapper("JVM_GetMethodIxIxUTF"); 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->name()->as_utf8(); 2466 JVM_END 2467 2468 2469 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2470 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2471 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2472 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2473 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2474 return method->signature()->as_utf8(); 2475 JVM_END 2476 2477 /** 2478 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2479 * read entries in the constant pool. Since the old verifier always 2480 * works on a copy of the code, it will not see any rewriting that 2481 * may possibly occur in the middle of verification. So it is important 2482 * that nothing it calls tries to use the cpCache instead of the raw 2483 * constant pool, so we must use cp->uncached_x methods when appropriate. 2484 */ 2485 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2486 JVMWrapper("JVM_GetCPFieldNameUTF"); 2487 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2488 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2489 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2490 switch (cp->tag_at(cp_index).value()) { 2491 case JVM_CONSTANT_Fieldref: 2492 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2493 default: 2494 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2495 } 2496 ShouldNotReachHere(); 2497 return NULL; 2498 JVM_END 2499 2500 2501 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2502 JVMWrapper("JVM_GetCPMethodNameUTF"); 2503 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2504 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2505 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2506 switch (cp->tag_at(cp_index).value()) { 2507 case JVM_CONSTANT_InterfaceMethodref: 2508 case JVM_CONSTANT_Methodref: 2509 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2510 default: 2511 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2512 } 2513 ShouldNotReachHere(); 2514 return NULL; 2515 JVM_END 2516 2517 2518 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2519 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2520 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2521 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2522 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2523 switch (cp->tag_at(cp_index).value()) { 2524 case JVM_CONSTANT_InterfaceMethodref: 2525 case JVM_CONSTANT_Methodref: 2526 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2527 default: 2528 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2529 } 2530 ShouldNotReachHere(); 2531 return NULL; 2532 JVM_END 2533 2534 2535 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2536 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2537 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2538 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2539 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2540 switch (cp->tag_at(cp_index).value()) { 2541 case JVM_CONSTANT_Fieldref: 2542 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2543 default: 2544 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2545 } 2546 ShouldNotReachHere(); 2547 return NULL; 2548 JVM_END 2549 2550 2551 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2552 JVMWrapper("JVM_GetCPClassNameUTF"); 2553 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2554 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2555 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2556 Symbol* classname = cp->klass_name_at(cp_index); 2557 return classname->as_utf8(); 2558 JVM_END 2559 2560 2561 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2562 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2563 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2564 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2565 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2566 switch (cp->tag_at(cp_index).value()) { 2567 case JVM_CONSTANT_Fieldref: { 2568 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2569 Symbol* classname = cp->klass_name_at(class_index); 2570 return classname->as_utf8(); 2571 } 2572 default: 2573 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2574 } 2575 ShouldNotReachHere(); 2576 return NULL; 2577 JVM_END 2578 2579 2580 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2581 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2582 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2583 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2584 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2585 switch (cp->tag_at(cp_index).value()) { 2586 case JVM_CONSTANT_Methodref: 2587 case JVM_CONSTANT_InterfaceMethodref: { 2588 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2589 Symbol* classname = cp->klass_name_at(class_index); 2590 return classname->as_utf8(); 2591 } 2592 default: 2593 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2594 } 2595 ShouldNotReachHere(); 2596 return NULL; 2597 JVM_END 2598 2599 2600 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2601 JVMWrapper("JVM_GetCPFieldModifiers"); 2602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2603 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2604 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2605 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2606 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2607 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2608 switch (cp->tag_at(cp_index).value()) { 2609 case JVM_CONSTANT_Fieldref: { 2610 Symbol* name = cp->uncached_name_ref_at(cp_index); 2611 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2612 InstanceKlass* ik = InstanceKlass::cast(k_called); 2613 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2614 if (fs.name() == name && fs.signature() == signature) { 2615 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2616 } 2617 } 2618 return -1; 2619 } 2620 default: 2621 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2622 } 2623 ShouldNotReachHere(); 2624 return 0; 2625 JVM_END 2626 2627 2628 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2629 JVMWrapper("JVM_GetCPMethodModifiers"); 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 switch (cp->tag_at(cp_index).value()) { 2636 case JVM_CONSTANT_Methodref: 2637 case JVM_CONSTANT_InterfaceMethodref: { 2638 Symbol* name = cp->uncached_name_ref_at(cp_index); 2639 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2640 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2641 int methods_count = methods->length(); 2642 for (int i = 0; i < methods_count; i++) { 2643 Method* method = methods->at(i); 2644 if (method->name() == name && method->signature() == signature) { 2645 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2646 } 2647 } 2648 return -1; 2649 } 2650 default: 2651 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2652 } 2653 ShouldNotReachHere(); 2654 return 0; 2655 JVM_END 2656 2657 2658 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2659 2660 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2661 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2662 JVM_END 2663 2664 2665 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2666 JVMWrapper("JVM_IsSameClassPackage"); 2667 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2668 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2669 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2670 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2671 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2672 JVM_END 2673 2674 // Printing support ////////////////////////////////////////////////// 2675 extern "C" { 2676 2677 ATTRIBUTE_PRINTF(3, 0) 2678 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2679 // Reject count values that are negative signed values converted to 2680 // unsigned; see bug 4399518, 4417214 2681 if ((intptr_t)count <= 0) return -1; 2682 2683 int result = os::vsnprintf(str, count, fmt, args); 2684 if (result > 0 && (size_t)result >= count) { 2685 result = -1; 2686 } 2687 2688 return result; 2689 } 2690 2691 ATTRIBUTE_PRINTF(3, 4) 2692 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2693 va_list args; 2694 int len; 2695 va_start(args, fmt); 2696 len = jio_vsnprintf(str, count, fmt, args); 2697 va_end(args); 2698 return len; 2699 } 2700 2701 ATTRIBUTE_PRINTF(2, 3) 2702 int jio_fprintf(FILE* f, const char *fmt, ...) { 2703 int len; 2704 va_list args; 2705 va_start(args, fmt); 2706 len = jio_vfprintf(f, fmt, args); 2707 va_end(args); 2708 return len; 2709 } 2710 2711 ATTRIBUTE_PRINTF(2, 0) 2712 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2713 if (Arguments::vfprintf_hook() != NULL) { 2714 return Arguments::vfprintf_hook()(f, fmt, args); 2715 } else { 2716 return vfprintf(f, fmt, args); 2717 } 2718 } 2719 2720 ATTRIBUTE_PRINTF(1, 2) 2721 JNIEXPORT int jio_printf(const char *fmt, ...) { 2722 int len; 2723 va_list args; 2724 va_start(args, fmt); 2725 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2726 va_end(args); 2727 return len; 2728 } 2729 2730 // HotSpot specific jio method 2731 void jio_print(const char* s, size_t len) { 2732 // Try to make this function as atomic as possible. 2733 if (Arguments::vfprintf_hook() != NULL) { 2734 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2735 } else { 2736 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2737 size_t count = ::write(defaultStream::output_fd(), s, (int)len); 2738 } 2739 } 2740 2741 } // Extern C 2742 2743 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2744 2745 // In most of the JVM thread support functions we need to access the 2746 // thread through a ThreadsListHandle to prevent it from exiting and 2747 // being reclaimed while we try to operate on it. The exceptions to this 2748 // rule are when operating on the current thread, or if the monitor of 2749 // the target java.lang.Thread is locked at the Java level - in both 2750 // cases the target cannot exit. 2751 2752 static void thread_entry(JavaThread* thread, TRAPS) { 2753 HandleMark hm(THREAD); 2754 Handle obj(THREAD, thread->threadObj()); 2755 JavaValue result(T_VOID); 2756 JavaCalls::call_virtual(&result, 2757 obj, 2758 SystemDictionary::Thread_klass(), 2759 vmSymbols::run_method_name(), 2760 vmSymbols::void_method_signature(), 2761 THREAD); 2762 } 2763 2764 2765 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2766 JVMWrapper("JVM_StartThread"); 2767 JavaThread *native_thread = NULL; 2768 2769 // We cannot hold the Threads_lock when we throw an exception, 2770 // due to rank ordering issues. Example: we might need to grab the 2771 // Heap_lock while we construct the exception. 2772 bool throw_illegal_thread_state = false; 2773 2774 // We must release the Threads_lock before we can post a jvmti event 2775 // in Thread::start. 2776 { 2777 // Ensure that the C++ Thread and OSThread structures aren't freed before 2778 // we operate. 2779 MutexLocker mu(Threads_lock); 2780 2781 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2782 // re-starting an already started thread, so we should usually find 2783 // that the JavaThread is null. However for a JNI attached thread 2784 // there is a small window between the Thread object being created 2785 // (with its JavaThread set) and the update to its threadStatus, so we 2786 // have to check for this 2787 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2788 throw_illegal_thread_state = true; 2789 } else { 2790 // We could also check the stillborn flag to see if this thread was already stopped, but 2791 // for historical reasons we let the thread detect that itself when it starts running 2792 2793 jlong size = 2794 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2795 // Allocate the C++ Thread structure and create the native thread. The 2796 // stack size retrieved from java is 64-bit signed, but the constructor takes 2797 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2798 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2799 // - Avoid passing negative values which would result in really large stacks. 2800 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2801 size_t sz = size > 0 ? (size_t) size : 0; 2802 native_thread = new JavaThread(&thread_entry, sz); 2803 2804 // At this point it may be possible that no osthread was created for the 2805 // JavaThread due to lack of memory. Check for this situation and throw 2806 // an exception if necessary. Eventually we may want to change this so 2807 // that we only grab the lock if the thread was created successfully - 2808 // then we can also do this check and throw the exception in the 2809 // JavaThread constructor. 2810 if (native_thread->osthread() != NULL) { 2811 // Note: the current thread is not being used within "prepare". 2812 native_thread->prepare(jthread); 2813 } 2814 } 2815 } 2816 2817 if (throw_illegal_thread_state) { 2818 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2819 } 2820 2821 assert(native_thread != NULL, "Starting null thread?"); 2822 2823 if (native_thread->osthread() == NULL) { 2824 // No one should hold a reference to the 'native_thread'. 2825 native_thread->smr_delete(); 2826 if (JvmtiExport::should_post_resource_exhausted()) { 2827 JvmtiExport::post_resource_exhausted( 2828 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2829 os::native_thread_creation_failed_msg()); 2830 } 2831 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2832 os::native_thread_creation_failed_msg()); 2833 } 2834 2835 Thread::start(native_thread); 2836 2837 JVM_END 2838 2839 2840 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2841 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2842 // but is thought to be reliable and simple. In the case, where the receiver is the 2843 // same thread as the sender, no VM_Operation is needed. 2844 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2845 JVMWrapper("JVM_StopThread"); 2846 2847 // A nested ThreadsListHandle will grab the Threads_lock so create 2848 // tlh before we resolve throwable. 2849 ThreadsListHandle tlh(thread); 2850 oop java_throwable = JNIHandles::resolve(throwable); 2851 if (java_throwable == NULL) { 2852 THROW(vmSymbols::java_lang_NullPointerException()); 2853 } 2854 oop java_thread = NULL; 2855 JavaThread* receiver = NULL; 2856 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2857 Events::log_exception(thread, 2858 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2859 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2860 2861 if (is_alive) { 2862 // jthread refers to a live JavaThread. 2863 if (thread == receiver) { 2864 // Exception is getting thrown at self so no VM_Operation needed. 2865 THROW_OOP(java_throwable); 2866 } else { 2867 // Use a VM_Operation to throw the exception. 2868 Thread::send_async_exception(java_thread, java_throwable); 2869 } 2870 } else { 2871 // Either: 2872 // - target thread has not been started before being stopped, or 2873 // - target thread already terminated 2874 // We could read the threadStatus to determine which case it is 2875 // but that is overkill as it doesn't matter. We must set the 2876 // stillborn flag for the first case, and if the thread has already 2877 // exited setting this flag has no effect. 2878 java_lang_Thread::set_stillborn(java_thread); 2879 } 2880 JVM_END 2881 2882 2883 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2884 JVMWrapper("JVM_IsThreadAlive"); 2885 2886 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2887 return java_lang_Thread::is_alive(thread_oop); 2888 JVM_END 2889 2890 2891 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2892 JVMWrapper("JVM_SuspendThread"); 2893 2894 ThreadsListHandle tlh(thread); 2895 JavaThread* receiver = NULL; 2896 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2897 if (is_alive) { 2898 // jthread refers to a live JavaThread. 2899 { 2900 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2901 if (receiver->is_external_suspend()) { 2902 // Don't allow nested external suspend requests. We can't return 2903 // an error from this interface so just ignore the problem. 2904 return; 2905 } 2906 if (receiver->is_exiting()) { // thread is in the process of exiting 2907 return; 2908 } 2909 receiver->set_external_suspend(); 2910 } 2911 2912 // java_suspend() will catch threads in the process of exiting 2913 // and will ignore them. 2914 receiver->java_suspend(); 2915 2916 // It would be nice to have the following assertion in all the 2917 // time, but it is possible for a racing resume request to have 2918 // resumed this thread right after we suspended it. Temporarily 2919 // enable this assertion if you are chasing a different kind of 2920 // bug. 2921 // 2922 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2923 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2924 } 2925 JVM_END 2926 2927 2928 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2929 JVMWrapper("JVM_ResumeThread"); 2930 2931 ThreadsListHandle tlh(thread); 2932 JavaThread* receiver = NULL; 2933 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2934 if (is_alive) { 2935 // jthread refers to a live JavaThread. 2936 2937 // This is the original comment for this Threads_lock grab: 2938 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2939 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2940 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2941 // looks at it. 2942 // 2943 // The above comment dates back to when we had both internal and 2944 // external suspend APIs that shared a common underlying mechanism. 2945 // External suspend is now entirely cooperative and doesn't share 2946 // anything with internal suspend. That said, there are some 2947 // assumptions in the VM that an external resume grabs the 2948 // Threads_lock. We can't drop the Threads_lock grab here until we 2949 // resolve the assumptions that exist elsewhere. 2950 // 2951 MutexLocker ml(Threads_lock); 2952 receiver->java_resume(); 2953 } 2954 JVM_END 2955 2956 2957 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2958 JVMWrapper("JVM_SetThreadPriority"); 2959 2960 ThreadsListHandle tlh(thread); 2961 oop java_thread = NULL; 2962 JavaThread* receiver = NULL; 2963 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2964 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2965 2966 if (is_alive) { 2967 // jthread refers to a live JavaThread. 2968 Thread::set_priority(receiver, (ThreadPriority)prio); 2969 } 2970 // Implied else: If the JavaThread hasn't started yet, then the 2971 // priority set in the java.lang.Thread object above will be pushed 2972 // down when it does start. 2973 JVM_END 2974 2975 2976 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2977 JVMWrapper("JVM_Yield"); 2978 if (os::dont_yield()) return; 2979 HOTSPOT_THREAD_YIELD(); 2980 os::naked_yield(); 2981 JVM_END 2982 2983 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) { 2984 assert(event != NULL, "invariant"); 2985 assert(event->should_commit(), "invariant"); 2986 event->set_time(millis); 2987 event->commit(); 2988 } 2989 2990 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2991 JVMWrapper("JVM_Sleep"); 2992 2993 if (millis < 0) { 2994 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2995 } 2996 2997 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2998 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2999 } 3000 3001 // Save current thread state and restore it at the end of this block. 3002 // And set new thread state to SLEEPING. 3003 JavaThreadSleepState jtss(thread); 3004 3005 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3006 EventThreadSleep event; 3007 3008 if (millis == 0) { 3009 os::naked_yield(); 3010 } else { 3011 ThreadState old_state = thread->osthread()->get_state(); 3012 thread->osthread()->set_state(SLEEPING); 3013 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3014 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3015 // us while we were sleeping. We do not overwrite those. 3016 if (!HAS_PENDING_EXCEPTION) { 3017 if (event.should_commit()) { 3018 post_thread_sleep_event(&event, millis); 3019 } 3020 HOTSPOT_THREAD_SLEEP_END(1); 3021 3022 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3023 // to properly restore the thread state. That's likely wrong. 3024 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3025 } 3026 } 3027 thread->osthread()->set_state(old_state); 3028 } 3029 if (event.should_commit()) { 3030 post_thread_sleep_event(&event, millis); 3031 } 3032 HOTSPOT_THREAD_SLEEP_END(0); 3033 JVM_END 3034 3035 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3036 JVMWrapper("JVM_CurrentThread"); 3037 oop jthread = thread->threadObj(); 3038 assert (thread != NULL, "no current thread!"); 3039 return JNIHandles::make_local(env, jthread); 3040 JVM_END 3041 3042 3043 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3044 JVMWrapper("JVM_CountStackFrames"); 3045 3046 uint32_t debug_bits = 0; 3047 ThreadsListHandle tlh(thread); 3048 JavaThread* receiver = NULL; 3049 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3050 int count = 0; 3051 if (is_alive) { 3052 // jthread refers to a live JavaThread. 3053 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) { 3054 // Count all java activation, i.e., number of vframes. 3055 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) { 3056 // Native frames are not counted. 3057 if (!vfst.method()->is_native()) count++; 3058 } 3059 } else { 3060 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3061 "this thread is not suspended"); 3062 } 3063 } 3064 // Implied else: if JavaThread is not alive simply return a count of 0. 3065 3066 return count; 3067 JVM_END 3068 3069 3070 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3071 JVMWrapper("JVM_Interrupt"); 3072 3073 ThreadsListHandle tlh(thread); 3074 JavaThread* receiver = NULL; 3075 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3076 if (is_alive) { 3077 // jthread refers to a live JavaThread. 3078 Thread::interrupt(receiver); 3079 } 3080 JVM_END 3081 3082 3083 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3084 JVMWrapper("JVM_IsInterrupted"); 3085 3086 ThreadsListHandle tlh(thread); 3087 JavaThread* receiver = NULL; 3088 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3089 if (is_alive) { 3090 // jthread refers to a live JavaThread. 3091 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0); 3092 } else { 3093 return JNI_FALSE; 3094 } 3095 JVM_END 3096 3097 3098 // Return true iff the current thread has locked the object passed in 3099 3100 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3101 JVMWrapper("JVM_HoldsLock"); 3102 assert(THREAD->is_Java_thread(), "sanity check"); 3103 if (obj == NULL) { 3104 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3105 } 3106 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3107 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3108 JVM_END 3109 3110 3111 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3112 JVMWrapper("JVM_DumpAllStacks"); 3113 VM_PrintThreads op; 3114 VMThread::execute(&op); 3115 if (JvmtiExport::should_post_data_dump()) { 3116 JvmtiExport::post_data_dump(); 3117 } 3118 JVM_END 3119 3120 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3121 JVMWrapper("JVM_SetNativeThreadName"); 3122 3123 // We don't use a ThreadsListHandle here because the current thread 3124 // must be alive. 3125 oop java_thread = JNIHandles::resolve_non_null(jthread); 3126 JavaThread* thr = java_lang_Thread::thread(java_thread); 3127 if (thread == thr && !thr->has_attached_via_jni()) { 3128 // Thread naming is only supported for the current thread and 3129 // we don't set the name of an attached thread to avoid stepping 3130 // on other programs. 3131 ResourceMark rm(thread); 3132 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3133 os::set_native_thread_name(thread_name); 3134 } 3135 JVM_END 3136 3137 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3138 3139 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3140 JVMWrapper("JVM_GetClassContext"); 3141 ResourceMark rm(THREAD); 3142 JvmtiVMObjectAllocEventCollector oam; 3143 vframeStream vfst(thread); 3144 3145 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3146 // This must only be called from SecurityManager.getClassContext 3147 Method* m = vfst.method(); 3148 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3149 m->name() == vmSymbols::getClassContext_name() && 3150 m->signature() == vmSymbols::void_class_array_signature())) { 3151 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3152 } 3153 } 3154 3155 // Collect method holders 3156 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3157 for (; !vfst.at_end(); vfst.security_next()) { 3158 Method* m = vfst.method(); 3159 // Native frames are not returned 3160 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3161 Klass* holder = m->method_holder(); 3162 assert(holder->is_klass(), "just checking"); 3163 klass_array->append(holder); 3164 } 3165 } 3166 3167 // Create result array of type [Ljava/lang/Class; 3168 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3169 // Fill in mirrors corresponding to method holders 3170 for (int i = 0; i < klass_array->length(); i++) { 3171 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3172 } 3173 3174 return (jobjectArray) JNIHandles::make_local(env, result); 3175 JVM_END 3176 3177 3178 // java.lang.Package //////////////////////////////////////////////////////////////// 3179 3180 3181 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3182 JVMWrapper("JVM_GetSystemPackage"); 3183 ResourceMark rm(THREAD); 3184 JvmtiVMObjectAllocEventCollector oam; 3185 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3186 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3187 return (jstring) JNIHandles::make_local(result); 3188 JVM_END 3189 3190 3191 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3192 JVMWrapper("JVM_GetSystemPackages"); 3193 JvmtiVMObjectAllocEventCollector oam; 3194 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3195 return (jobjectArray) JNIHandles::make_local(result); 3196 JVM_END 3197 3198 3199 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3200 3201 3202 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3203 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3204 3205 MonitorLockerEx ml(Heap_lock); 3206 oop ref = Universe::reference_pending_list(); 3207 if (ref != NULL) { 3208 Universe::set_reference_pending_list(NULL); 3209 } 3210 return JNIHandles::make_local(env, ref); 3211 JVM_END 3212 3213 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3214 JVMWrapper("JVM_HasReferencePendingList"); 3215 MonitorLockerEx ml(Heap_lock); 3216 return Universe::has_reference_pending_list(); 3217 JVM_END 3218 3219 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3220 JVMWrapper("JVM_WaitForReferencePendingList"); 3221 MonitorLockerEx ml(Heap_lock); 3222 while (!Universe::has_reference_pending_list()) { 3223 ml.wait(); 3224 } 3225 JVM_END 3226 3227 3228 // ObjectInputStream /////////////////////////////////////////////////////////////// 3229 3230 // Return the first user-defined class loader up the execution stack, or null 3231 // if only code from the bootstrap or platform class loader is on the stack. 3232 3233 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3234 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3235 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3236 oop loader = vfst.method()->method_holder()->class_loader(); 3237 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3238 return JNIHandles::make_local(env, loader); 3239 } 3240 } 3241 return NULL; 3242 JVM_END 3243 3244 3245 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3246 3247 3248 // resolve array handle and check arguments 3249 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3250 if (arr == NULL) { 3251 THROW_0(vmSymbols::java_lang_NullPointerException()); 3252 } 3253 oop a = JNIHandles::resolve_non_null(arr); 3254 if (!a->is_array()) { 3255 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3256 } else if (type_array_only && !a->is_typeArray()) { 3257 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3258 } 3259 return arrayOop(a); 3260 } 3261 3262 3263 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3264 JVMWrapper("JVM_GetArrayLength"); 3265 arrayOop a = check_array(env, arr, false, CHECK_0); 3266 return a->length(); 3267 JVM_END 3268 3269 3270 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3271 JVMWrapper("JVM_Array_Get"); 3272 JvmtiVMObjectAllocEventCollector oam; 3273 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3274 jvalue value; 3275 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3276 oop box = Reflection::box(&value, type, CHECK_NULL); 3277 return JNIHandles::make_local(env, box); 3278 JVM_END 3279 3280 3281 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3282 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3283 jvalue value; 3284 value.i = 0; // to initialize value before getting used in CHECK 3285 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3286 assert(a->is_typeArray(), "just checking"); 3287 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3288 BasicType wide_type = (BasicType) wCode; 3289 if (type != wide_type) { 3290 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3291 } 3292 return value; 3293 JVM_END 3294 3295 3296 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3297 JVMWrapper("JVM_SetArrayElement"); 3298 arrayOop a = check_array(env, arr, false, CHECK); 3299 oop box = JNIHandles::resolve(val); 3300 jvalue value; 3301 value.i = 0; // to initialize value before getting used in CHECK 3302 BasicType value_type; 3303 if (a->is_objArray()) { 3304 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3305 value_type = Reflection::unbox_for_regular_object(box, &value); 3306 } else { 3307 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3308 } 3309 Reflection::array_set(&value, a, index, value_type, CHECK); 3310 JVM_END 3311 3312 3313 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3314 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3315 arrayOop a = check_array(env, arr, true, CHECK); 3316 assert(a->is_typeArray(), "just checking"); 3317 BasicType value_type = (BasicType) vCode; 3318 Reflection::array_set(&v, a, index, value_type, CHECK); 3319 JVM_END 3320 3321 3322 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3323 JVMWrapper("JVM_NewArray"); 3324 JvmtiVMObjectAllocEventCollector oam; 3325 oop element_mirror = JNIHandles::resolve(eltClass); 3326 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3327 return JNIHandles::make_local(env, result); 3328 JVM_END 3329 3330 3331 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3332 JVMWrapper("JVM_NewMultiArray"); 3333 JvmtiVMObjectAllocEventCollector oam; 3334 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3335 oop element_mirror = JNIHandles::resolve(eltClass); 3336 assert(dim_array->is_typeArray(), "just checking"); 3337 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3338 return JNIHandles::make_local(env, result); 3339 JVM_END 3340 3341 3342 // Library support /////////////////////////////////////////////////////////////////////////// 3343 3344 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3345 //%note jvm_ct 3346 JVMWrapper("JVM_LoadLibrary"); 3347 char ebuf[1024]; 3348 void *load_result; 3349 { 3350 ThreadToNativeFromVM ttnfvm(thread); 3351 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3352 } 3353 if (load_result == NULL) { 3354 char msg[1024]; 3355 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3356 // Since 'ebuf' may contain a string encoded using 3357 // platform encoding scheme, we need to pass 3358 // Exceptions::unsafe_to_utf8 to the new_exception method 3359 // as the last argument. See bug 6367357. 3360 Handle h_exception = 3361 Exceptions::new_exception(thread, 3362 vmSymbols::java_lang_UnsatisfiedLinkError(), 3363 msg, Exceptions::unsafe_to_utf8); 3364 3365 THROW_HANDLE_0(h_exception); 3366 } 3367 return load_result; 3368 JVM_END 3369 3370 3371 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3372 JVMWrapper("JVM_UnloadLibrary"); 3373 os::dll_unload(handle); 3374 JVM_END 3375 3376 3377 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3378 JVMWrapper("JVM_FindLibraryEntry"); 3379 return os::dll_lookup(handle, name); 3380 JVM_END 3381 3382 3383 // JNI version /////////////////////////////////////////////////////////////////////////////// 3384 3385 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3386 JVMWrapper("JVM_IsSupportedJNIVersion"); 3387 return Threads::is_supported_jni_version_including_1_1(version); 3388 JVM_END 3389 3390 3391 // String support /////////////////////////////////////////////////////////////////////////// 3392 3393 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3394 JVMWrapper("JVM_InternString"); 3395 JvmtiVMObjectAllocEventCollector oam; 3396 if (str == NULL) return NULL; 3397 oop string = JNIHandles::resolve_non_null(str); 3398 oop result = StringTable::intern(string, CHECK_NULL); 3399 return (jstring) JNIHandles::make_local(env, result); 3400 JVM_END 3401 3402 3403 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3404 3405 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3406 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3407 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3408 // that only works with java threads. 3409 3410 3411 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3412 VM_Exit::block_if_vm_exited(); 3413 JVMWrapper("JVM_RawMonitorCreate"); 3414 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3415 } 3416 3417 3418 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3419 VM_Exit::block_if_vm_exited(); 3420 JVMWrapper("JVM_RawMonitorDestroy"); 3421 delete ((Mutex*) mon); 3422 } 3423 3424 3425 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3426 VM_Exit::block_if_vm_exited(); 3427 JVMWrapper("JVM_RawMonitorEnter"); 3428 ((Mutex*) mon)->jvm_raw_lock(); 3429 return 0; 3430 } 3431 3432 3433 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3434 VM_Exit::block_if_vm_exited(); 3435 JVMWrapper("JVM_RawMonitorExit"); 3436 ((Mutex*) mon)->jvm_raw_unlock(); 3437 } 3438 3439 3440 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3441 3442 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3443 Handle loader, Handle protection_domain, 3444 jboolean throwError, TRAPS) { 3445 // Security Note: 3446 // The Java level wrapper will perform the necessary security check allowing 3447 // us to pass the NULL as the initiating class loader. The VM is responsible for 3448 // the checkPackageAccess relative to the initiating class loader via the 3449 // protection_domain. The protection_domain is passed as NULL by the java code 3450 // if there is no security manager in 3-arg Class.forName(). 3451 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3452 3453 // Check if we should initialize the class 3454 if (init && klass->is_instance_klass()) { 3455 klass->initialize(CHECK_NULL); 3456 } 3457 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3458 } 3459 3460 3461 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3462 3463 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3464 JVMWrapper("JVM_InvokeMethod"); 3465 Handle method_handle; 3466 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3467 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3468 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3469 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3470 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3471 jobject res = JNIHandles::make_local(env, result); 3472 if (JvmtiExport::should_post_vm_object_alloc()) { 3473 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3474 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3475 if (java_lang_Class::is_primitive(ret_type)) { 3476 // Only for primitive type vm allocates memory for java object. 3477 // See box() method. 3478 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3479 } 3480 } 3481 return res; 3482 } else { 3483 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3484 } 3485 JVM_END 3486 3487 3488 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3489 JVMWrapper("JVM_NewInstanceFromConstructor"); 3490 oop constructor_mirror = JNIHandles::resolve(c); 3491 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3492 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3493 jobject res = JNIHandles::make_local(env, result); 3494 if (JvmtiExport::should_post_vm_object_alloc()) { 3495 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3496 } 3497 return res; 3498 JVM_END 3499 3500 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3501 3502 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3503 JVMWrapper("JVM_SupportsCX8"); 3504 return VM_Version::supports_cx8(); 3505 JVM_END 3506 3507 // Returns an array of all live Thread objects (VM internal JavaThreads, 3508 // jvmti agent threads, and JNI attaching threads are skipped) 3509 // See CR 6404306 regarding JNI attaching threads 3510 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3511 ResourceMark rm(THREAD); 3512 ThreadsListEnumerator tle(THREAD, false, false); 3513 JvmtiVMObjectAllocEventCollector oam; 3514 3515 int num_threads = tle.num_threads(); 3516 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3517 objArrayHandle threads_ah(THREAD, r); 3518 3519 for (int i = 0; i < num_threads; i++) { 3520 Handle h = tle.get_threadObj(i); 3521 threads_ah->obj_at_put(i, h()); 3522 } 3523 3524 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3525 JVM_END 3526 3527 3528 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3529 // Return StackTraceElement[][], each element is the stack trace of a thread in 3530 // the corresponding entry in the given threads array 3531 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3532 JVMWrapper("JVM_DumpThreads"); 3533 JvmtiVMObjectAllocEventCollector oam; 3534 3535 // Check if threads is null 3536 if (threads == NULL) { 3537 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3538 } 3539 3540 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3541 objArrayHandle ah(THREAD, a); 3542 int num_threads = ah->length(); 3543 // check if threads is non-empty array 3544 if (num_threads == 0) { 3545 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3546 } 3547 3548 // check if threads is not an array of objects of Thread class 3549 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3550 if (k != SystemDictionary::Thread_klass()) { 3551 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3552 } 3553 3554 ResourceMark rm(THREAD); 3555 3556 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3557 for (int i = 0; i < num_threads; i++) { 3558 oop thread_obj = ah->obj_at(i); 3559 instanceHandle h(THREAD, (instanceOop) thread_obj); 3560 thread_handle_array->append(h); 3561 } 3562 3563 // The JavaThread references in thread_handle_array are validated 3564 // in VM_ThreadDump::doit(). 3565 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3566 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3567 3568 JVM_END 3569 3570 // JVM monitoring and management support 3571 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3572 return Management::get_jmm_interface(version); 3573 JVM_END 3574 3575 // com.sun.tools.attach.VirtualMachine agent properties support 3576 // 3577 // Initialize the agent properties with the properties maintained in the VM 3578 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3579 JVMWrapper("JVM_InitAgentProperties"); 3580 ResourceMark rm; 3581 3582 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3583 3584 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3585 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3586 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3587 return properties; 3588 JVM_END 3589 3590 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3591 { 3592 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3593 JvmtiVMObjectAllocEventCollector oam; 3594 3595 if (ofClass == NULL) { 3596 return NULL; 3597 } 3598 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3599 // Special handling for primitive objects 3600 if (java_lang_Class::is_primitive(mirror())) { 3601 return NULL; 3602 } 3603 Klass* k = java_lang_Class::as_Klass(mirror()); 3604 if (!k->is_instance_klass()) { 3605 return NULL; 3606 } 3607 InstanceKlass* ik = InstanceKlass::cast(k); 3608 int encl_method_class_idx = ik->enclosing_method_class_index(); 3609 if (encl_method_class_idx == 0) { 3610 return NULL; 3611 } 3612 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3613 objArrayHandle dest(THREAD, dest_o); 3614 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3615 dest->obj_at_put(0, enc_k->java_mirror()); 3616 int encl_method_method_idx = ik->enclosing_method_method_index(); 3617 if (encl_method_method_idx != 0) { 3618 Symbol* sym = ik->constants()->symbol_at( 3619 extract_low_short_from_int( 3620 ik->constants()->name_and_type_at(encl_method_method_idx))); 3621 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3622 dest->obj_at_put(1, str()); 3623 sym = ik->constants()->symbol_at( 3624 extract_high_short_from_int( 3625 ik->constants()->name_and_type_at(encl_method_method_idx))); 3626 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3627 dest->obj_at_put(2, str()); 3628 } 3629 return (jobjectArray) JNIHandles::make_local(dest()); 3630 } 3631 JVM_END 3632 3633 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3634 { 3635 memset(info, 0, info_size); 3636 3637 info->jvm_version = Abstract_VM_Version::jvm_version(); 3638 info->patch_version = Abstract_VM_Version::vm_patch_version(); 3639 3640 // when we add a new capability in the jvm_version_info struct, we should also 3641 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3642 // counter defined in runtimeService.cpp. 3643 info->is_attach_supported = AttachListener::is_attach_supported(); 3644 } 3645 JVM_END 3646 3647 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3648 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3649 ResourceMark rm(THREAD); 3650 3651 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3652 return NULL; 3653 } 3654 3655 char** vm_flags = Arguments::jvm_flags_array(); 3656 char** vm_args = Arguments::jvm_args_array(); 3657 int num_flags = Arguments::num_jvm_flags(); 3658 int num_args = Arguments::num_jvm_args(); 3659 3660 InstanceKlass* ik = SystemDictionary::String_klass(); 3661 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3662 objArrayHandle result_h(THREAD, r); 3663 3664 int index = 0; 3665 for (int j = 0; j < num_flags; j++, index++) { 3666 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3667 result_h->obj_at_put(index, h()); 3668 } 3669 for (int i = 0; i < num_args; i++, index++) { 3670 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3671 result_h->obj_at_put(index, h()); 3672 } 3673 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3674 JVM_END 3675 3676 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3677 return os::get_signal_number(name); 3678 JVM_END