1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "classfile/classFileStream.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/javaAssertions.hpp" 31 #include "classfile/javaClasses.inline.hpp" 32 #include "classfile/moduleEntry.hpp" 33 #include "classfile/modules.hpp" 34 #include "classfile/packageEntry.hpp" 35 #include "classfile/stringTable.hpp" 36 #include "classfile/systemDictionary.hpp" 37 #include "classfile/vmSymbols.hpp" 38 #include "gc/shared/collectedHeap.inline.hpp" 39 #include "interpreter/bytecode.hpp" 40 #include "memory/oopFactory.hpp" 41 #include "memory/resourceArea.hpp" 42 #include "memory/universe.inline.hpp" 43 #include "oops/access.inline.hpp" 44 #include "oops/fieldStreams.hpp" 45 #include "oops/instanceKlass.hpp" 46 #include "oops/method.hpp" 47 #include "oops/objArrayKlass.hpp" 48 #include "oops/objArrayOop.inline.hpp" 49 #include "oops/oop.inline.hpp" 50 #include "oops/valueArrayKlass.hpp" 51 #include "prims/jvm_misc.hpp" 52 #include "prims/jvmtiExport.hpp" 53 #include "prims/jvmtiThreadState.hpp" 54 #include "prims/nativeLookup.hpp" 55 #include "prims/privilegedStack.hpp" 56 #include "prims/stackwalk.hpp" 57 #include "runtime/arguments.hpp" 58 #include "runtime/atomic.hpp" 59 #include "runtime/handles.inline.hpp" 60 #include "runtime/init.hpp" 61 #include "runtime/interfaceSupport.hpp" 62 #include "runtime/java.hpp" 63 #include "runtime/javaCalls.hpp" 64 #include "runtime/jfieldIDWorkaround.hpp" 65 #include "runtime/jniHandles.inline.hpp" 66 #include "runtime/orderAccess.inline.hpp" 67 #include "runtime/os.inline.hpp" 68 #include "runtime/perfData.hpp" 69 #include "runtime/reflection.hpp" 70 #include "runtime/thread.inline.hpp" 71 #include "runtime/threadSMR.hpp" 72 #include "runtime/vframe.hpp" 73 #include "runtime/vm_operations.hpp" 74 #include "runtime/vm_version.hpp" 75 #include "services/attachListener.hpp" 76 #include "services/management.hpp" 77 #include "services/threadService.hpp" 78 #include "trace/tracing.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/sharedClassUtil.hpp" 88 #include "classfile/systemDictionaryShared.hpp" 89 #endif 90 91 #include <errno.h> 92 93 /* 94 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 95 such ctors and calls MUST NOT come between an oop declaration/init and its 96 usage because if objects are move this may cause various memory stomps, bus 97 errors and segfaults. Here is a cookbook for causing so called "naked oop 98 failures": 99 100 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 101 JVMWrapper("JVM_GetClassDeclaredFields"); 102 103 // Object address to be held directly in mirror & not visible to GC 104 oop mirror = JNIHandles::resolve_non_null(ofClass); 105 106 // If this ctor can hit a safepoint, moving objects around, then 107 ComplexConstructor foo; 108 109 // Boom! mirror may point to JUNK instead of the intended object 110 (some dereference of mirror) 111 112 // Here's another call that may block for GC, making mirror stale 113 MutexLocker ml(some_lock); 114 115 // And here's an initializer that can result in a stale oop 116 // all in one step. 117 oop o = call_that_can_throw_exception(TRAPS); 118 119 120 The solution is to keep the oop declaration BELOW the ctor or function 121 call that might cause a GC, do another resolve to reassign the oop, or 122 consider use of a Handle instead of an oop so there is immunity from object 123 motion. But note that the "QUICK" entries below do not have a handlemark 124 and thus can only support use of handles passed in. 125 */ 126 127 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 128 ResourceMark rm; 129 int line_number = -1; 130 const char * source_file = NULL; 131 const char * trace = "explicit"; 132 InstanceKlass* caller = NULL; 133 JavaThread* jthread = JavaThread::current(); 134 if (jthread->has_last_Java_frame()) { 135 vframeStream vfst(jthread); 136 137 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 138 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 139 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 140 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 141 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 142 143 Method* last_caller = NULL; 144 145 while (!vfst.at_end()) { 146 Method* m = vfst.method(); 147 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 148 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 149 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 150 break; 151 } 152 last_caller = m; 153 vfst.next(); 154 } 155 // if this is called from Class.forName0 and that is called from Class.forName, 156 // then print the caller of Class.forName. If this is Class.loadClass, then print 157 // that caller, otherwise keep quiet since this should be picked up elsewhere. 158 bool found_it = false; 159 if (!vfst.at_end() && 160 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 161 vfst.method()->name() == vmSymbols::forName0_name()) { 162 vfst.next(); 163 if (!vfst.at_end() && 164 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 165 vfst.method()->name() == vmSymbols::forName_name()) { 166 vfst.next(); 167 found_it = true; 168 } 169 } else if (last_caller != NULL && 170 last_caller->method_holder()->name() == 171 vmSymbols::java_lang_ClassLoader() && 172 last_caller->name() == vmSymbols::loadClass_name()) { 173 found_it = true; 174 } else if (!vfst.at_end()) { 175 if (vfst.method()->is_native()) { 176 // JNI call 177 found_it = true; 178 } 179 } 180 if (found_it && !vfst.at_end()) { 181 // found the caller 182 caller = vfst.method()->method_holder(); 183 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 184 if (line_number == -1) { 185 // show method name if it's a native method 186 trace = vfst.method()->name_and_sig_as_C_string(); 187 } 188 Symbol* s = caller->source_file_name(); 189 if (s != NULL) { 190 source_file = s->as_C_string(); 191 } 192 } 193 } 194 if (caller != NULL) { 195 if (to_class != caller) { 196 const char * from = caller->external_name(); 197 const char * to = to_class->external_name(); 198 // print in a single call to reduce interleaving between threads 199 if (source_file != NULL) { 200 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 201 } else { 202 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 203 } 204 } 205 } 206 } 207 208 void trace_class_resolution(Klass* to_class) { 209 EXCEPTION_MARK; 210 trace_class_resolution_impl(to_class, THREAD); 211 if (HAS_PENDING_EXCEPTION) { 212 CLEAR_PENDING_EXCEPTION; 213 } 214 } 215 216 // Wrapper to trace JVM functions 217 218 #ifdef ASSERT 219 Histogram* JVMHistogram; 220 volatile int JVMHistogram_lock = 0; 221 222 class JVMHistogramElement : public HistogramElement { 223 public: 224 JVMHistogramElement(const char* name); 225 }; 226 227 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 228 _name = elementName; 229 uintx count = 0; 230 231 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 232 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 233 count +=1; 234 if ( (WarnOnStalledSpinLock > 0) 235 && (count % WarnOnStalledSpinLock == 0)) { 236 warning("JVMHistogram_lock seems to be stalled"); 237 } 238 } 239 } 240 241 if(JVMHistogram == NULL) 242 JVMHistogram = new Histogram("JVM Call Counts",100); 243 244 JVMHistogram->add_element(this); 245 Atomic::dec(&JVMHistogram_lock); 246 } 247 248 #define JVMCountWrapper(arg) \ 249 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 250 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 251 252 #define JVMWrapper(arg) JVMCountWrapper(arg); 253 #else 254 #define JVMWrapper(arg) 255 #endif 256 257 258 // Interface version ///////////////////////////////////////////////////////////////////// 259 260 261 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 262 return JVM_INTERFACE_VERSION; 263 JVM_END 264 265 266 // java.lang.System ////////////////////////////////////////////////////////////////////// 267 268 269 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 270 JVMWrapper("JVM_CurrentTimeMillis"); 271 return os::javaTimeMillis(); 272 JVM_END 273 274 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 275 JVMWrapper("JVM_NanoTime"); 276 return os::javaTimeNanos(); 277 JVM_END 278 279 // The function below is actually exposed by jdk.internal.misc.VM and not 280 // java.lang.System, but we choose to keep it here so that it stays next 281 // to JVM_CurrentTimeMillis and JVM_NanoTime 282 283 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 284 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 285 286 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 287 JVMWrapper("JVM_GetNanoTimeAdjustment"); 288 jlong seconds; 289 jlong nanos; 290 291 os::javaTimeSystemUTC(seconds, nanos); 292 293 // We're going to verify that the result can fit in a long. 294 // For that we need the difference in seconds between 'seconds' 295 // and 'offset_secs' to be such that: 296 // |seconds - offset_secs| < (2^63/10^9) 297 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 298 // which makes |seconds - offset_secs| < 2^33 299 // and we will prefer +/- 2^32 as the maximum acceptable diff 300 // as 2^32 has a more natural feel than 2^33... 301 // 302 // So if |seconds - offset_secs| >= 2^32 - we return a special 303 // sentinel value (-1) which the caller should take as an 304 // exception value indicating that the offset given to us is 305 // too far from range of the current time - leading to too big 306 // a nano adjustment. The caller is expected to recover by 307 // computing a more accurate offset and calling this method 308 // again. (For the record 2^32 secs is ~136 years, so that 309 // should rarely happen) 310 // 311 jlong diff = seconds - offset_secs; 312 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 313 return -1; // sentinel value: the offset is too far off the target 314 } 315 316 // return the adjustment. If you compute a time by adding 317 // this number of nanoseconds along with the number of seconds 318 // in the offset you should get the current UTC time. 319 return (diff * (jlong)1000000000) + nanos; 320 JVM_END 321 322 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 323 jobject dst, jint dst_pos, jint length)) 324 JVMWrapper("JVM_ArrayCopy"); 325 // Check if we have null pointers 326 if (src == NULL || dst == NULL) { 327 THROW(vmSymbols::java_lang_NullPointerException()); 328 } 329 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 330 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 331 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 332 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 333 // Do copy 334 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 335 JVM_END 336 337 338 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 339 JavaValue r(T_OBJECT); 340 // public synchronized Object put(Object key, Object value); 341 HandleMark hm(THREAD); 342 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 343 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 344 JavaCalls::call_virtual(&r, 345 props, 346 SystemDictionary::Properties_klass(), 347 vmSymbols::put_name(), 348 vmSymbols::object_object_object_signature(), 349 key_str, 350 value_str, 351 THREAD); 352 } 353 354 355 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 356 357 358 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 359 JVMWrapper("JVM_InitProperties"); 360 ResourceMark rm; 361 362 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 363 364 // System property list includes both user set via -D option and 365 // jvm system specific properties. 366 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 367 PUTPROP(props, p->key(), p->value()); 368 } 369 370 // Convert the -XX:MaxDirectMemorySize= command line flag 371 // to the sun.nio.MaxDirectMemorySize property. 372 // Do this after setting user properties to prevent people 373 // from setting the value with a -D option, as requested. 374 { 375 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 376 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 377 } else { 378 char as_chars[256]; 379 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 380 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 381 } 382 } 383 384 // JVM monitoring and management support 385 // Add the sun.management.compiler property for the compiler's name 386 { 387 #undef CSIZE 388 #if defined(_LP64) || defined(_WIN64) 389 #define CSIZE "64-Bit " 390 #else 391 #define CSIZE 392 #endif // 64bit 393 394 #ifdef TIERED 395 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 396 #else 397 #if defined(COMPILER1) 398 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 399 #elif defined(COMPILER2) 400 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 401 #elif INCLUDE_JVMCI 402 #error "INCLUDE_JVMCI should imply TIERED" 403 #else 404 const char* compiler_name = ""; 405 #endif // compilers 406 #endif // TIERED 407 408 if (*compiler_name != '\0' && 409 (Arguments::mode() != Arguments::_int)) { 410 PUTPROP(props, "sun.management.compiler", compiler_name); 411 } 412 } 413 414 return properties; 415 JVM_END 416 417 418 /* 419 * Return the temporary directory that the VM uses for the attach 420 * and perf data files. 421 * 422 * It is important that this directory is well-known and the 423 * same for all VM instances. It cannot be affected by configuration 424 * variables such as java.io.tmpdir. 425 */ 426 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 427 JVMWrapper("JVM_GetTemporaryDirectory"); 428 HandleMark hm(THREAD); 429 const char* temp_dir = os::get_temp_directory(); 430 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 431 return (jstring) JNIHandles::make_local(env, h()); 432 JVM_END 433 434 435 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 436 437 extern volatile jint vm_created; 438 439 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 440 JVMWrapper("JVM_BeforeHalt"); 441 EventShutdown event; 442 if (event.should_commit()) { 443 event.set_reason("Shutdown requested from Java"); 444 event.commit(); 445 } 446 JVM_END 447 448 449 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 450 before_exit(thread); 451 vm_exit(code); 452 JVM_END 453 454 455 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 456 JVMWrapper("JVM_GC"); 457 if (!DisableExplicitGC) { 458 Universe::heap()->collect(GCCause::_java_lang_system_gc); 459 } 460 JVM_END 461 462 463 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 464 JVMWrapper("JVM_MaxObjectInspectionAge"); 465 return Universe::heap()->millis_since_last_gc(); 466 JVM_END 467 468 469 static inline jlong convert_size_t_to_jlong(size_t val) { 470 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 471 NOT_LP64 (return (jlong)val;) 472 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 473 } 474 475 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 476 JVMWrapper("JVM_TotalMemory"); 477 size_t n = Universe::heap()->capacity(); 478 return convert_size_t_to_jlong(n); 479 JVM_END 480 481 482 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 483 JVMWrapper("JVM_FreeMemory"); 484 CollectedHeap* ch = Universe::heap(); 485 size_t n; 486 { 487 MutexLocker x(Heap_lock); 488 n = ch->capacity() - ch->used(); 489 } 490 return convert_size_t_to_jlong(n); 491 JVM_END 492 493 494 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 495 JVMWrapper("JVM_MaxMemory"); 496 size_t n = Universe::heap()->max_capacity(); 497 return convert_size_t_to_jlong(n); 498 JVM_END 499 500 501 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 502 JVMWrapper("JVM_ActiveProcessorCount"); 503 return os::active_processor_count(); 504 JVM_END 505 506 507 508 // java.lang.Throwable ////////////////////////////////////////////////////// 509 510 511 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 512 JVMWrapper("JVM_FillInStackTrace"); 513 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 514 java_lang_Throwable::fill_in_stack_trace(exception); 515 JVM_END 516 517 518 // java.lang.StackTraceElement ////////////////////////////////////////////// 519 520 521 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 522 JVMWrapper("JVM_InitStackTraceElementArray"); 523 Handle exception(THREAD, JNIHandles::resolve(throwable)); 524 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 525 objArrayHandle stack_trace(THREAD, st); 526 // Fill in the allocated stack trace 527 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 528 JVM_END 529 530 531 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 532 JVMWrapper("JVM_InitStackTraceElement"); 533 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 534 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 535 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 536 JVM_END 537 538 539 // java.lang.StackWalker ////////////////////////////////////////////////////// 540 541 542 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 543 jint skip_frames, jint frame_count, jint start_index, 544 jobjectArray frames)) 545 JVMWrapper("JVM_CallStackWalk"); 546 JavaThread* jt = (JavaThread*) THREAD; 547 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 548 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 549 } 550 551 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 552 553 // frames array is a Class<?>[] array when only getting caller reference, 554 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 555 // be null. 556 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 557 objArrayHandle frames_array_h(THREAD, fa); 558 559 int limit = start_index + frame_count; 560 if (frames_array_h->length() < limit) { 561 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 562 } 563 564 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 565 start_index, frames_array_h, CHECK_NULL); 566 return JNIHandles::make_local(env, result); 567 JVM_END 568 569 570 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 571 jint frame_count, jint start_index, 572 jobjectArray frames)) 573 JVMWrapper("JVM_MoreStackWalk"); 574 JavaThread* jt = (JavaThread*) THREAD; 575 576 // frames array is a Class<?>[] array when only getting caller reference, 577 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 578 // be null. 579 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 580 objArrayHandle frames_array_h(THREAD, fa); 581 582 int limit = start_index+frame_count; 583 if (frames_array_h->length() < limit) { 584 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 585 } 586 587 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 588 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 589 start_index, frames_array_h, THREAD); 590 JVM_END 591 592 // java.lang.Object /////////////////////////////////////////////// 593 594 595 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 596 JVMWrapper("JVM_IHashCode"); 597 // as implemented in the classic virtual machine; return 0 if object is NULL 598 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 599 JVM_END 600 601 602 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 603 JVMWrapper("JVM_MonitorWait"); 604 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 605 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 606 if (JvmtiExport::should_post_monitor_wait()) { 607 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 608 609 // The current thread already owns the monitor and it has not yet 610 // been added to the wait queue so the current thread cannot be 611 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 612 // event handler cannot accidentally consume an unpark() meant for 613 // the ParkEvent associated with this ObjectMonitor. 614 } 615 ObjectSynchronizer::wait(obj, ms, CHECK); 616 JVM_END 617 618 619 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 620 JVMWrapper("JVM_MonitorNotify"); 621 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 622 ObjectSynchronizer::notify(obj, CHECK); 623 JVM_END 624 625 626 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 627 JVMWrapper("JVM_MonitorNotifyAll"); 628 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 629 ObjectSynchronizer::notifyall(obj, CHECK); 630 JVM_END 631 632 633 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 634 JVMWrapper("JVM_Clone"); 635 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 636 Klass* klass = obj->klass(); 637 JvmtiVMObjectAllocEventCollector oam; 638 639 #ifdef ASSERT 640 // Just checking that the cloneable flag is set correct 641 if (obj->is_array()) { 642 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 643 } else { 644 guarantee(obj->is_instance(), "should be instanceOop"); 645 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 646 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 647 } 648 #endif 649 650 // Check if class of obj supports the Cloneable interface. 651 // All arrays are considered to be cloneable (See JLS 20.1.5) 652 if (!klass->is_cloneable()) { 653 ResourceMark rm(THREAD); 654 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 655 } 656 657 // Make shallow object copy 658 const int size = obj->size(); 659 oop new_obj_oop = NULL; 660 if (obj->is_array()) { 661 const int length = ((arrayOop)obj())->length(); 662 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 663 } else { 664 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 665 } 666 667 HeapAccess<>::clone(obj(), new_obj_oop, size); 668 669 Handle new_obj(THREAD, new_obj_oop); 670 // Caution: this involves a java upcall, so the clone should be 671 // "gc-robust" by this stage. 672 if (klass->has_finalizer()) { 673 assert(obj->is_instance(), "should be instanceOop"); 674 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 675 new_obj = Handle(THREAD, new_obj_oop); 676 } 677 678 return JNIHandles::make_local(env, new_obj()); 679 JVM_END 680 681 // java.io.File /////////////////////////////////////////////////////////////// 682 683 JVM_LEAF(char*, JVM_NativePath(char* path)) 684 JVMWrapper("JVM_NativePath"); 685 return os::native_path(path); 686 JVM_END 687 688 689 // Misc. class handling /////////////////////////////////////////////////////////// 690 691 692 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 693 JVMWrapper("JVM_GetCallerClass"); 694 695 // Getting the class of the caller frame. 696 // 697 // The call stack at this point looks something like this: 698 // 699 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 700 // [1] [ @CallerSensitive API.method ] 701 // [.] [ (skipped intermediate frames) ] 702 // [n] [ caller ] 703 vframeStream vfst(thread); 704 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 705 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 706 Method* m = vfst.method(); 707 assert(m != NULL, "sanity"); 708 switch (n) { 709 case 0: 710 // This must only be called from Reflection.getCallerClass 711 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 712 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 713 } 714 // fall-through 715 case 1: 716 // Frame 0 and 1 must be caller sensitive. 717 if (!m->caller_sensitive()) { 718 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 719 } 720 break; 721 default: 722 if (!m->is_ignored_by_security_stack_walk()) { 723 // We have reached the desired frame; return the holder class. 724 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 725 } 726 break; 727 } 728 } 729 return NULL; 730 JVM_END 731 732 733 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 734 JVMWrapper("JVM_FindPrimitiveClass"); 735 oop mirror = NULL; 736 BasicType t = name2type(utf); 737 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 738 mirror = Universe::java_mirror(t); 739 } 740 if (mirror == NULL) { 741 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 742 } else { 743 return (jclass) JNIHandles::make_local(env, mirror); 744 } 745 JVM_END 746 747 748 // Returns a class loaded by the bootstrap class loader; or null 749 // if not found. ClassNotFoundException is not thrown. 750 // FindClassFromBootLoader is exported to the launcher for windows. 751 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 752 const char* name)) 753 JVMWrapper("JVM_FindClassFromBootLoader"); 754 755 // Java libraries should ensure that name is never null... 756 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 757 // It's impossible to create this class; the name cannot fit 758 // into the constant pool. 759 return NULL; 760 } 761 762 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 763 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 764 if (k == NULL) { 765 return NULL; 766 } 767 768 if (log_is_enabled(Debug, class, resolve)) { 769 trace_class_resolution(k); 770 } 771 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 772 JVM_END 773 774 // Find a class with this name in this loader, using the caller's protection domain. 775 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 776 jboolean init, jobject loader, 777 jclass caller)) 778 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 779 // Java libraries should ensure that name is never null... 780 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 781 // It's impossible to create this class; the name cannot fit 782 // into the constant pool. 783 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 784 } 785 786 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 787 788 oop loader_oop = JNIHandles::resolve(loader); 789 oop from_class = JNIHandles::resolve(caller); 790 oop protection_domain = NULL; 791 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 792 // NPE. Put it in another way, the bootstrap class loader has all permission and 793 // thus no checkPackageAccess equivalence in the VM class loader. 794 // The caller is also passed as NULL by the java code if there is no security 795 // manager to avoid the performance cost of getting the calling class. 796 if (from_class != NULL && loader_oop != NULL) { 797 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 798 } 799 800 Handle h_loader(THREAD, loader_oop); 801 Handle h_prot(THREAD, protection_domain); 802 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 803 h_prot, false, THREAD); 804 805 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 806 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 807 } 808 return result; 809 JVM_END 810 811 // Currently only called from the old verifier. 812 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 813 jboolean init, jclass from)) 814 JVMWrapper("JVM_FindClassFromClass"); 815 if (name == NULL) { 816 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 817 } 818 if ((int)strlen(name) > Symbol::max_length()) { 819 // It's impossible to create this class; the name cannot fit 820 // into the constant pool. 821 Exceptions::fthrow(THREAD_AND_LOCATION, 822 vmSymbols::java_lang_NoClassDefFoundError(), 823 "Class name exceeds maximum length of %d: %s", 824 Symbol::max_length(), 825 name); 826 return 0; 827 } 828 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 829 oop from_class_oop = JNIHandles::resolve(from); 830 Klass* from_class = (from_class_oop == NULL) 831 ? (Klass*)NULL 832 : java_lang_Class::as_Klass(from_class_oop); 833 oop class_loader = NULL; 834 oop protection_domain = NULL; 835 if (from_class != NULL) { 836 class_loader = from_class->class_loader(); 837 protection_domain = from_class->protection_domain(); 838 } 839 Handle h_loader(THREAD, class_loader); 840 Handle h_prot (THREAD, protection_domain); 841 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 842 h_prot, true, thread); 843 844 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 845 // this function is generally only used for class loading during verification. 846 ResourceMark rm; 847 oop from_mirror = JNIHandles::resolve_non_null(from); 848 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 849 const char * from_name = from_class->external_name(); 850 851 oop mirror = JNIHandles::resolve_non_null(result); 852 Klass* to_class = java_lang_Class::as_Klass(mirror); 853 const char * to = to_class->external_name(); 854 log_debug(class, resolve)("%s %s (verification)", from_name, to); 855 } 856 857 return result; 858 JVM_END 859 860 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 861 if (loader.is_null()) { 862 return; 863 } 864 865 // check whether the current caller thread holds the lock or not. 866 // If not, increment the corresponding counter 867 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 868 ObjectSynchronizer::owner_self) { 869 counter->inc(); 870 } 871 } 872 873 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 874 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 875 jobject loader, const jbyte *buf, 876 jsize len, jobject pd, const char *source, 877 TRAPS) { 878 if (source == NULL) source = "__JVM_DefineClass__"; 879 880 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 881 JavaThread* jt = (JavaThread*) THREAD; 882 883 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 884 ClassLoader::perf_define_appclass_selftime(), 885 ClassLoader::perf_define_appclasses(), 886 jt->get_thread_stat()->perf_recursion_counts_addr(), 887 jt->get_thread_stat()->perf_timers_addr(), 888 PerfClassTraceTime::DEFINE_CLASS); 889 890 if (UsePerfData) { 891 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 892 } 893 894 // Since exceptions can be thrown, class initialization can take place 895 // if name is NULL no check for class name in .class stream has to be made. 896 TempNewSymbol class_name = NULL; 897 if (name != NULL) { 898 const int str_len = (int)strlen(name); 899 if (str_len > Symbol::max_length()) { 900 // It's impossible to create this class; the name cannot fit 901 // into the constant pool. 902 Exceptions::fthrow(THREAD_AND_LOCATION, 903 vmSymbols::java_lang_NoClassDefFoundError(), 904 "Class name exceeds maximum length of %d: %s", 905 Symbol::max_length(), 906 name); 907 return 0; 908 } 909 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 910 } 911 912 ResourceMark rm(THREAD); 913 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 914 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 915 if (UsePerfData) { 916 is_lock_held_by_thread(class_loader, 917 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 918 THREAD); 919 } 920 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 921 Klass* k = SystemDictionary::resolve_from_stream(class_name, 922 class_loader, 923 protection_domain, 924 &st, 925 CHECK_NULL); 926 927 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 928 trace_class_resolution(k); 929 } 930 931 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 932 } 933 934 935 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 936 JVMWrapper("JVM_DefineClass"); 937 938 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 939 JVM_END 940 941 942 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 943 JVMWrapper("JVM_DefineClassWithSource"); 944 945 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 946 JVM_END 947 948 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 949 JVMWrapper("JVM_FindLoadedClass"); 950 ResourceMark rm(THREAD); 951 952 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 953 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 954 955 const char* str = java_lang_String::as_utf8_string(string()); 956 // Sanity check, don't expect null 957 if (str == NULL) return NULL; 958 959 const int str_len = (int)strlen(str); 960 if (str_len > Symbol::max_length()) { 961 // It's impossible to create this class; the name cannot fit 962 // into the constant pool. 963 return NULL; 964 } 965 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 966 967 // Security Note: 968 // The Java level wrapper will perform the necessary security check allowing 969 // us to pass the NULL as the initiating class loader. 970 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 971 if (UsePerfData) { 972 is_lock_held_by_thread(h_loader, 973 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 974 THREAD); 975 } 976 977 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 978 h_loader, 979 Handle(), 980 CHECK_NULL); 981 #if INCLUDE_CDS 982 if (k == NULL) { 983 // If the class is not already loaded, try to see if it's in the shared 984 // archive for the current classloader (h_loader). 985 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 986 } 987 #endif 988 return (k == NULL) ? NULL : 989 (jclass) JNIHandles::make_local(env, k->java_mirror()); 990 JVM_END 991 992 // Module support ////////////////////////////////////////////////////////////////////////////// 993 994 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 995 jstring location, const char* const* packages, jsize num_packages)) 996 JVMWrapper("JVM_DefineModule"); 997 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 998 JVM_END 999 1000 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1001 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1002 Modules::set_bootloader_unnamed_module(module, CHECK); 1003 JVM_END 1004 1005 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1006 JVMWrapper("JVM_AddModuleExports"); 1007 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1008 JVM_END 1009 1010 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1011 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1012 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1013 JVM_END 1014 1015 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1016 JVMWrapper("JVM_AddModuleExportsToAll"); 1017 Modules::add_module_exports(from_module, package, NULL, CHECK); 1018 JVM_END 1019 1020 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1021 JVMWrapper("JVM_AddReadsModule"); 1022 Modules::add_reads_module(from_module, source_module, CHECK); 1023 JVM_END 1024 1025 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1026 1027 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1028 assert (cls != NULL, "illegal class"); 1029 JVMWrapper("JVM_GetClassName"); 1030 JvmtiVMObjectAllocEventCollector oam; 1031 ResourceMark rm(THREAD); 1032 const char* name; 1033 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1034 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1035 } else { 1036 // Consider caching interned string in Klass 1037 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1038 assert(k->is_klass(), "just checking"); 1039 name = k->external_name(); 1040 } 1041 oop result = StringTable::intern((char*) name, CHECK_NULL); 1042 return (jstring) JNIHandles::make_local(env, result); 1043 JVM_END 1044 1045 1046 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1047 JVMWrapper("JVM_GetClassInterfaces"); 1048 JvmtiVMObjectAllocEventCollector oam; 1049 oop mirror = JNIHandles::resolve_non_null(cls); 1050 1051 // Special handling for primitive objects 1052 if (java_lang_Class::is_primitive(mirror)) { 1053 // Primitive objects does not have any interfaces 1054 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1055 return (jobjectArray) JNIHandles::make_local(env, r); 1056 } 1057 1058 Klass* klass = java_lang_Class::as_Klass(mirror); 1059 // Figure size of result array 1060 int size; 1061 if (klass->is_instance_klass()) { 1062 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1063 } else { 1064 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1065 size = 2; 1066 } 1067 1068 // Allocate result array 1069 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1070 objArrayHandle result (THREAD, r); 1071 // Fill in result 1072 if (klass->is_instance_klass()) { 1073 // Regular instance klass, fill in all local interfaces 1074 for (int index = 0; index < size; index++) { 1075 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1076 result->obj_at_put(index, k->java_mirror()); 1077 } 1078 } else { 1079 // All arrays implement java.lang.Cloneable and java.io.Serializable 1080 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1081 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1082 } 1083 return (jobjectArray) JNIHandles::make_local(env, result()); 1084 JVM_END 1085 1086 1087 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1088 JVMWrapper("JVM_IsInterface"); 1089 oop mirror = JNIHandles::resolve_non_null(cls); 1090 if (java_lang_Class::is_primitive(mirror)) { 1091 return JNI_FALSE; 1092 } 1093 Klass* k = java_lang_Class::as_Klass(mirror); 1094 jboolean result = k->is_interface(); 1095 assert(!result || k->is_instance_klass(), 1096 "all interfaces are instance types"); 1097 // The compiler intrinsic for isInterface tests the 1098 // Klass::_access_flags bits in the same way. 1099 return result; 1100 JVM_END 1101 1102 1103 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1104 JVMWrapper("JVM_GetClassSigners"); 1105 JvmtiVMObjectAllocEventCollector oam; 1106 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1107 // There are no signers for primitive types 1108 return NULL; 1109 } 1110 1111 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1112 1113 // If there are no signers set in the class, or if the class 1114 // is an array, return NULL. 1115 if (signers == NULL) return NULL; 1116 1117 // copy of the signers array 1118 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1119 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1120 for (int index = 0; index < signers->length(); index++) { 1121 signers_copy->obj_at_put(index, signers->obj_at(index)); 1122 } 1123 1124 // return the copy 1125 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1126 JVM_END 1127 1128 1129 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1130 JVMWrapper("JVM_SetClassSigners"); 1131 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1132 // This call is ignored for primitive types and arrays. 1133 // Signers are only set once, ClassLoader.java, and thus shouldn't 1134 // be called with an array. Only the bootstrap loader creates arrays. 1135 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1136 if (k->is_instance_klass()) { 1137 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1138 } 1139 } 1140 JVM_END 1141 1142 1143 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1144 JVMWrapper("JVM_GetProtectionDomain"); 1145 if (JNIHandles::resolve(cls) == NULL) { 1146 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1147 } 1148 1149 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1150 // Primitive types does not have a protection domain. 1151 return NULL; 1152 } 1153 1154 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1155 return (jobject) JNIHandles::make_local(env, pd); 1156 JVM_END 1157 1158 1159 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) { 1160 // If there is a security manager and protection domain, check the access 1161 // in the protection domain, otherwise it is authorized. 1162 if (java_lang_System::has_security_manager()) { 1163 1164 // For bootstrapping, if pd implies method isn't in the JDK, allow 1165 // this context to revert to older behavior. 1166 // In this case the isAuthorized field in AccessControlContext is also not 1167 // present. 1168 if (Universe::protection_domain_implies_method() == NULL) { 1169 return true; 1170 } 1171 1172 // Whitelist certain access control contexts 1173 if (java_security_AccessControlContext::is_authorized(context)) { 1174 return true; 1175 } 1176 1177 oop prot = klass->protection_domain(); 1178 if (prot != NULL) { 1179 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1180 // in the new wrapper. 1181 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1182 Handle h_prot(THREAD, prot); 1183 JavaValue result(T_BOOLEAN); 1184 JavaCallArguments args(h_prot); 1185 JavaCalls::call(&result, m, &args, CHECK_false); 1186 return (result.get_jboolean() != 0); 1187 } 1188 } 1189 return true; 1190 } 1191 1192 // Create an AccessControlContext with a protection domain with null codesource 1193 // and null permissions - which gives no permissions. 1194 oop create_dummy_access_control_context(TRAPS) { 1195 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1196 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1197 // Call constructor ProtectionDomain(null, null); 1198 JavaValue result(T_VOID); 1199 JavaCalls::call_special(&result, obj, pd_klass, 1200 vmSymbols::object_initializer_name(), 1201 vmSymbols::codesource_permissioncollection_signature(), 1202 Handle(), Handle(), CHECK_NULL); 1203 1204 // new ProtectionDomain[] {pd}; 1205 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1206 context->obj_at_put(0, obj()); 1207 1208 // new AccessControlContext(new ProtectionDomain[] {pd}) 1209 objArrayHandle h_context(THREAD, context); 1210 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1211 return acc; 1212 } 1213 1214 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1215 JVMWrapper("JVM_DoPrivileged"); 1216 1217 if (action == NULL) { 1218 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1219 } 1220 1221 // Compute the frame initiating the do privileged operation and setup the privileged stack 1222 vframeStream vfst(thread); 1223 vfst.security_get_caller_frame(1); 1224 1225 if (vfst.at_end()) { 1226 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1227 } 1228 1229 Method* method = vfst.method(); 1230 InstanceKlass* klass = method->method_holder(); 1231 1232 // Check that action object understands "Object run()" 1233 Handle h_context; 1234 if (context != NULL) { 1235 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1236 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1237 if (!authorized) { 1238 // Create an unprivileged access control object and call it's run function 1239 // instead. 1240 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1241 h_context = Handle(THREAD, noprivs); 1242 } 1243 } 1244 1245 // Check that action object understands "Object run()" 1246 Handle object (THREAD, JNIHandles::resolve(action)); 1247 1248 // get run() method 1249 Method* m_oop = object->klass()->uncached_lookup_method( 1250 vmSymbols::run_method_name(), 1251 vmSymbols::void_object_signature(), 1252 Klass::find_overpass); 1253 1254 // See if there is a default method for "Object run()". 1255 if (m_oop == NULL && object->klass()->is_instance_klass()) { 1256 InstanceKlass* iklass = InstanceKlass::cast(object->klass()); 1257 m_oop = iklass->lookup_method_in_ordered_interfaces( 1258 vmSymbols::run_method_name(), 1259 vmSymbols::void_object_signature()); 1260 } 1261 1262 methodHandle m (THREAD, m_oop); 1263 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) { 1264 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1265 } 1266 1267 // Stack allocated list of privileged stack elements 1268 PrivilegedElement pi; 1269 if (!vfst.at_end()) { 1270 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1271 thread->set_privileged_stack_top(&pi); 1272 } 1273 1274 1275 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1276 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1277 Handle pending_exception; 1278 JavaValue result(T_OBJECT); 1279 JavaCallArguments args(object); 1280 JavaCalls::call(&result, m, &args, THREAD); 1281 1282 // done with action, remove ourselves from the list 1283 if (!vfst.at_end()) { 1284 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1285 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1286 } 1287 1288 if (HAS_PENDING_EXCEPTION) { 1289 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1290 CLEAR_PENDING_EXCEPTION; 1291 // JVMTI has already reported the pending exception 1292 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1293 if (THREAD->is_Java_thread()) { 1294 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1295 } 1296 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1297 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1298 // Throw a java.security.PrivilegedActionException(Exception e) exception 1299 JavaCallArguments args(pending_exception); 1300 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1301 vmSymbols::exception_void_signature(), 1302 &args); 1303 } 1304 } 1305 1306 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1307 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1308 JVM_END 1309 1310 1311 // Returns the inherited_access_control_context field of the running thread. 1312 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1313 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1314 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1315 return JNIHandles::make_local(env, result); 1316 JVM_END 1317 1318 class RegisterArrayForGC { 1319 private: 1320 JavaThread *_thread; 1321 public: 1322 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1323 _thread = thread; 1324 _thread->register_array_for_gc(array); 1325 } 1326 1327 ~RegisterArrayForGC() { 1328 _thread->register_array_for_gc(NULL); 1329 } 1330 }; 1331 1332 1333 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1334 JVMWrapper("JVM_GetStackAccessControlContext"); 1335 if (!UsePrivilegedStack) return NULL; 1336 1337 ResourceMark rm(THREAD); 1338 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1339 JvmtiVMObjectAllocEventCollector oam; 1340 1341 // count the protection domains on the execution stack. We collapse 1342 // duplicate consecutive protection domains into a single one, as 1343 // well as stopping when we hit a privileged frame. 1344 1345 // Use vframeStream to iterate through Java frames 1346 vframeStream vfst(thread); 1347 1348 oop previous_protection_domain = NULL; 1349 Handle privileged_context(thread, NULL); 1350 bool is_privileged = false; 1351 oop protection_domain = NULL; 1352 1353 for(; !vfst.at_end(); vfst.next()) { 1354 // get method of frame 1355 Method* method = vfst.method(); 1356 intptr_t* frame_id = vfst.frame_id(); 1357 1358 // check the privileged frames to see if we have a match 1359 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1360 // this frame is privileged 1361 is_privileged = true; 1362 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1363 protection_domain = thread->privileged_stack_top()->protection_domain(); 1364 } else { 1365 protection_domain = method->method_holder()->protection_domain(); 1366 } 1367 1368 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1369 local_array->push(protection_domain); 1370 previous_protection_domain = protection_domain; 1371 } 1372 1373 if (is_privileged) break; 1374 } 1375 1376 1377 // either all the domains on the stack were system domains, or 1378 // we had a privileged system domain 1379 if (local_array->is_empty()) { 1380 if (is_privileged && privileged_context.is_null()) return NULL; 1381 1382 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1383 return JNIHandles::make_local(env, result); 1384 } 1385 1386 // the resource area must be registered in case of a gc 1387 RegisterArrayForGC ragc(thread, local_array); 1388 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1389 local_array->length(), CHECK_NULL); 1390 objArrayHandle h_context(thread, context); 1391 for (int index = 0; index < local_array->length(); index++) { 1392 h_context->obj_at_put(index, local_array->at(index)); 1393 } 1394 1395 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1396 1397 return JNIHandles::make_local(env, result); 1398 JVM_END 1399 1400 1401 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1402 JVMWrapper("JVM_IsArrayClass"); 1403 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1404 return (k != NULL) && k->is_array_klass() ? true : false; 1405 JVM_END 1406 1407 1408 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1409 JVMWrapper("JVM_IsPrimitiveClass"); 1410 oop mirror = JNIHandles::resolve_non_null(cls); 1411 return (jboolean) java_lang_Class::is_primitive(mirror); 1412 JVM_END 1413 1414 1415 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1416 JVMWrapper("JVM_GetClassModifiers"); 1417 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1418 // Primitive type 1419 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1420 } 1421 1422 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1423 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1424 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1425 return k->modifier_flags(); 1426 JVM_END 1427 1428 1429 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1430 1431 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1432 JvmtiVMObjectAllocEventCollector oam; 1433 // ofClass is a reference to a java_lang_Class object. The mirror object 1434 // of an InstanceKlass 1435 1436 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1437 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1438 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1439 return (jobjectArray)JNIHandles::make_local(env, result); 1440 } 1441 1442 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1443 InnerClassesIterator iter(k); 1444 1445 if (iter.length() == 0) { 1446 // Neither an inner nor outer class 1447 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1448 return (jobjectArray)JNIHandles::make_local(env, result); 1449 } 1450 1451 // find inner class info 1452 constantPoolHandle cp(thread, k->constants()); 1453 int length = iter.length(); 1454 1455 // Allocate temp. result array 1456 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1457 objArrayHandle result (THREAD, r); 1458 int members = 0; 1459 1460 for (; !iter.done(); iter.next()) { 1461 int ioff = iter.inner_class_info_index(); 1462 int ooff = iter.outer_class_info_index(); 1463 1464 if (ioff != 0 && ooff != 0) { 1465 // Check to see if the name matches the class we're looking for 1466 // before attempting to find the class. 1467 if (cp->klass_name_at_matches(k, ooff)) { 1468 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1469 if (outer_klass == k) { 1470 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1471 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1472 1473 // Throws an exception if outer klass has not declared k as 1474 // an inner klass 1475 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1476 1477 result->obj_at_put(members, inner_klass->java_mirror()); 1478 members++; 1479 } 1480 } 1481 } 1482 } 1483 1484 if (members != length) { 1485 // Return array of right length 1486 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1487 for(int i = 0; i < members; i++) { 1488 res->obj_at_put(i, result->obj_at(i)); 1489 } 1490 return (jobjectArray)JNIHandles::make_local(env, res); 1491 } 1492 1493 return (jobjectArray)JNIHandles::make_local(env, result()); 1494 JVM_END 1495 1496 1497 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1498 { 1499 // ofClass is a reference to a java_lang_Class object. 1500 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1501 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1502 return NULL; 1503 } 1504 1505 bool inner_is_member = false; 1506 Klass* outer_klass 1507 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1508 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1509 if (outer_klass == NULL) return NULL; // already a top-level class 1510 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1511 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1512 } 1513 JVM_END 1514 1515 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1516 { 1517 oop mirror = JNIHandles::resolve_non_null(cls); 1518 if (java_lang_Class::is_primitive(mirror) || 1519 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1520 return NULL; 1521 } 1522 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1523 int ooff = 0, noff = 0; 1524 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1525 if (noff != 0) { 1526 constantPoolHandle i_cp(thread, k->constants()); 1527 Symbol* name = i_cp->symbol_at(noff); 1528 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1529 return (jstring) JNIHandles::make_local(env, str()); 1530 } 1531 } 1532 return NULL; 1533 } 1534 JVM_END 1535 1536 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1537 assert (cls != NULL, "illegal class"); 1538 JVMWrapper("JVM_GetClassSignature"); 1539 JvmtiVMObjectAllocEventCollector oam; 1540 ResourceMark rm(THREAD); 1541 // Return null for arrays and primatives 1542 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1544 if (k->is_instance_klass()) { 1545 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1546 if (sym == NULL) return NULL; 1547 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1548 return (jstring) JNIHandles::make_local(env, str()); 1549 } 1550 } 1551 return NULL; 1552 JVM_END 1553 1554 1555 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1556 assert (cls != NULL, "illegal class"); 1557 JVMWrapper("JVM_GetClassAnnotations"); 1558 1559 // Return null for arrays and primitives 1560 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1561 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1562 if (k->is_instance_klass()) { 1563 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1564 return (jbyteArray) JNIHandles::make_local(env, a); 1565 } 1566 } 1567 return NULL; 1568 JVM_END 1569 1570 1571 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1572 // some of this code was adapted from from jni_FromReflectedField 1573 1574 oop reflected = JNIHandles::resolve_non_null(field); 1575 oop mirror = java_lang_reflect_Field::clazz(reflected); 1576 Klass* k = java_lang_Class::as_Klass(mirror); 1577 int slot = java_lang_reflect_Field::slot(reflected); 1578 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1579 1580 InstanceKlass* ik = InstanceKlass::cast(k); 1581 intptr_t offset = ik->field_offset(slot); 1582 1583 if (modifiers & JVM_ACC_STATIC) { 1584 // for static fields we only look in the current class 1585 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1586 assert(false, "cannot find static field"); 1587 return false; 1588 } 1589 } else { 1590 // for instance fields we start with the current class and work 1591 // our way up through the superclass chain 1592 if (!ik->find_field_from_offset(offset, false, &fd)) { 1593 assert(false, "cannot find instance field"); 1594 return false; 1595 } 1596 } 1597 return true; 1598 } 1599 1600 static Method* jvm_get_method_common(jobject method) { 1601 // some of this code was adapted from from jni_FromReflectedMethod 1602 1603 oop reflected = JNIHandles::resolve_non_null(method); 1604 oop mirror = NULL; 1605 int slot = 0; 1606 1607 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1608 mirror = java_lang_reflect_Constructor::clazz(reflected); 1609 slot = java_lang_reflect_Constructor::slot(reflected); 1610 } else { 1611 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1612 "wrong type"); 1613 mirror = java_lang_reflect_Method::clazz(reflected); 1614 slot = java_lang_reflect_Method::slot(reflected); 1615 } 1616 Klass* k = java_lang_Class::as_Klass(mirror); 1617 1618 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1619 assert(m != NULL, "cannot find method"); 1620 return m; // caller has to deal with NULL in product mode 1621 } 1622 1623 /* Type use annotations support (JDK 1.8) */ 1624 1625 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1626 assert (cls != NULL, "illegal class"); 1627 JVMWrapper("JVM_GetClassTypeAnnotations"); 1628 ResourceMark rm(THREAD); 1629 // Return null for arrays and primitives 1630 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1631 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1632 if (k->is_instance_klass()) { 1633 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1634 if (type_annotations != NULL) { 1635 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1636 return (jbyteArray) JNIHandles::make_local(env, a); 1637 } 1638 } 1639 } 1640 return NULL; 1641 JVM_END 1642 1643 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1644 assert (method != NULL, "illegal method"); 1645 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1646 1647 // method is a handle to a java.lang.reflect.Method object 1648 Method* m = jvm_get_method_common(method); 1649 if (m == NULL) { 1650 return NULL; 1651 } 1652 1653 AnnotationArray* type_annotations = m->type_annotations(); 1654 if (type_annotations != NULL) { 1655 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1656 return (jbyteArray) JNIHandles::make_local(env, a); 1657 } 1658 1659 return NULL; 1660 JVM_END 1661 1662 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1663 assert (field != NULL, "illegal field"); 1664 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1665 1666 fieldDescriptor fd; 1667 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1668 if (!gotFd) { 1669 return NULL; 1670 } 1671 1672 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1673 JVM_END 1674 1675 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1676 if (!cp->is_within_bounds(index)) { 1677 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1678 } 1679 } 1680 1681 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1682 { 1683 JVMWrapper("JVM_GetMethodParameters"); 1684 // method is a handle to a java.lang.reflect.Method object 1685 Method* method_ptr = jvm_get_method_common(method); 1686 methodHandle mh (THREAD, method_ptr); 1687 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1688 const int num_params = mh->method_parameters_length(); 1689 1690 if (num_params < 0) { 1691 // A -1 return value from method_parameters_length means there is no 1692 // parameter data. Return null to indicate this to the reflection 1693 // API. 1694 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1695 return (jobjectArray)NULL; 1696 } else { 1697 // Otherwise, we return something up to reflection, even if it is 1698 // a zero-length array. Why? Because in some cases this can 1699 // trigger a MalformedParametersException. 1700 1701 // make sure all the symbols are properly formatted 1702 for (int i = 0; i < num_params; i++) { 1703 MethodParametersElement* params = mh->method_parameters_start(); 1704 int index = params[i].name_cp_index; 1705 bounds_check(mh->constants(), index, CHECK_NULL); 1706 1707 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1708 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1709 "Wrong type at constant pool index"); 1710 } 1711 1712 } 1713 1714 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1715 objArrayHandle result (THREAD, result_oop); 1716 1717 for (int i = 0; i < num_params; i++) { 1718 MethodParametersElement* params = mh->method_parameters_start(); 1719 // For a 0 index, give a NULL symbol 1720 Symbol* sym = 0 != params[i].name_cp_index ? 1721 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1722 int flags = params[i].flags; 1723 oop param = Reflection::new_parameter(reflected_method, i, sym, 1724 flags, CHECK_NULL); 1725 result->obj_at_put(i, param); 1726 } 1727 return (jobjectArray)JNIHandles::make_local(env, result()); 1728 } 1729 } 1730 JVM_END 1731 1732 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1733 1734 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1735 { 1736 JVMWrapper("JVM_GetClassDeclaredFields"); 1737 JvmtiVMObjectAllocEventCollector oam; 1738 1739 // Exclude primitive types and array types 1740 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1741 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1742 // Return empty array 1743 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1744 return (jobjectArray) JNIHandles::make_local(env, res); 1745 } 1746 1747 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1748 constantPoolHandle cp(THREAD, k->constants()); 1749 1750 // Ensure class is linked 1751 k->link_class(CHECK_NULL); 1752 1753 // Allocate result 1754 int num_fields; 1755 1756 if (publicOnly) { 1757 num_fields = 0; 1758 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1759 if (fs.access_flags().is_public()) ++num_fields; 1760 } 1761 } else { 1762 num_fields = k->java_fields_count(); 1763 } 1764 1765 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1766 objArrayHandle result (THREAD, r); 1767 1768 int out_idx = 0; 1769 fieldDescriptor fd; 1770 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1771 if (!publicOnly || fs.access_flags().is_public()) { 1772 fd.reinitialize(k, fs.index()); 1773 oop field = Reflection::new_field(&fd, CHECK_NULL); 1774 result->obj_at_put(out_idx, field); 1775 ++out_idx; 1776 } 1777 } 1778 assert(out_idx == num_fields, "just checking"); 1779 return (jobjectArray) JNIHandles::make_local(env, result()); 1780 } 1781 JVM_END 1782 1783 static bool select_method(const methodHandle& method, bool want_constructor) { 1784 if (want_constructor) { 1785 return (method->is_initializer() && !method->is_static()); 1786 } else { 1787 return (!method->is_initializer() && !method->is_overpass()); 1788 } 1789 } 1790 1791 static jobjectArray get_class_declared_methods_helper( 1792 JNIEnv *env, 1793 jclass ofClass, jboolean publicOnly, 1794 bool want_constructor, 1795 Klass* klass, TRAPS) { 1796 1797 JvmtiVMObjectAllocEventCollector oam; 1798 1799 // Exclude primitive types and array types 1800 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1801 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1802 // Return empty array 1803 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1804 return (jobjectArray) JNIHandles::make_local(env, res); 1805 } 1806 1807 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1808 1809 // Ensure class is linked 1810 k->link_class(CHECK_NULL); 1811 1812 Array<Method*>* methods = k->methods(); 1813 int methods_length = methods->length(); 1814 1815 // Save original method_idnum in case of redefinition, which can change 1816 // the idnum of obsolete methods. The new method will have the same idnum 1817 // but if we refresh the methods array, the counts will be wrong. 1818 ResourceMark rm(THREAD); 1819 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1820 int num_methods = 0; 1821 1822 for (int i = 0; i < methods_length; i++) { 1823 methodHandle method(THREAD, methods->at(i)); 1824 if (select_method(method, want_constructor)) { 1825 if (!publicOnly || method->is_public()) { 1826 idnums->push(method->method_idnum()); 1827 ++num_methods; 1828 } 1829 } 1830 } 1831 1832 // Allocate result 1833 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1834 objArrayHandle result (THREAD, r); 1835 1836 // Now just put the methods that we selected above, but go by their idnum 1837 // in case of redefinition. The methods can be redefined at any safepoint, 1838 // so above when allocating the oop array and below when creating reflect 1839 // objects. 1840 for (int i = 0; i < num_methods; i++) { 1841 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1842 if (method.is_null()) { 1843 // Method may have been deleted and seems this API can handle null 1844 // Otherwise should probably put a method that throws NSME 1845 result->obj_at_put(i, NULL); 1846 } else { 1847 oop m; 1848 if (want_constructor) { 1849 m = Reflection::new_constructor(method, CHECK_NULL); 1850 } else { 1851 m = Reflection::new_method(method, false, CHECK_NULL); 1852 } 1853 result->obj_at_put(i, m); 1854 } 1855 } 1856 1857 return (jobjectArray) JNIHandles::make_local(env, result()); 1858 } 1859 1860 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1861 { 1862 JVMWrapper("JVM_GetClassDeclaredMethods"); 1863 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1864 /*want_constructor*/ false, 1865 SystemDictionary::reflect_Method_klass(), THREAD); 1866 } 1867 JVM_END 1868 1869 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1870 { 1871 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1872 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1873 /*want_constructor*/ true, 1874 SystemDictionary::reflect_Constructor_klass(), THREAD); 1875 } 1876 JVM_END 1877 1878 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1879 { 1880 JVMWrapper("JVM_GetClassAccessFlags"); 1881 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1882 // Primitive type 1883 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1884 } 1885 1886 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1887 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1888 } 1889 JVM_END 1890 1891 1892 // Constant pool access ////////////////////////////////////////////////////////// 1893 1894 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1895 { 1896 JVMWrapper("JVM_GetClassConstantPool"); 1897 JvmtiVMObjectAllocEventCollector oam; 1898 1899 // Return null for primitives and arrays 1900 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1901 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1902 if (k->is_instance_klass()) { 1903 InstanceKlass* k_h = InstanceKlass::cast(k); 1904 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1905 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1906 return JNIHandles::make_local(jcp()); 1907 } 1908 } 1909 return NULL; 1910 } 1911 JVM_END 1912 1913 1914 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1915 { 1916 JVMWrapper("JVM_ConstantPoolGetSize"); 1917 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1918 return cp->length(); 1919 } 1920 JVM_END 1921 1922 1923 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1924 { 1925 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1926 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1927 bounds_check(cp, index, CHECK_NULL); 1928 constantTag tag = cp->tag_at(index); 1929 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1930 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1931 } 1932 Klass* k = cp->klass_at(index, CHECK_NULL); 1933 return (jclass) JNIHandles::make_local(k->java_mirror()); 1934 } 1935 JVM_END 1936 1937 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1938 { 1939 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1940 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1941 bounds_check(cp, index, CHECK_NULL); 1942 constantTag tag = cp->tag_at(index); 1943 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1944 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1945 } 1946 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1947 if (k == NULL) return NULL; 1948 return (jclass) JNIHandles::make_local(k->java_mirror()); 1949 } 1950 JVM_END 1951 1952 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 1953 constantTag tag = cp->tag_at(index); 1954 if (!tag.is_method() && !tag.is_interface_method()) { 1955 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1956 } 1957 int klass_ref = cp->uncached_klass_ref_index_at(index); 1958 Klass* k_o; 1959 if (force_resolution) { 1960 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1961 } else { 1962 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1963 if (k_o == NULL) return NULL; 1964 } 1965 InstanceKlass* k = InstanceKlass::cast(k_o); 1966 Symbol* name = cp->uncached_name_ref_at(index); 1967 Symbol* sig = cp->uncached_signature_ref_at(index); 1968 methodHandle m (THREAD, k->find_method(name, sig)); 1969 if (m.is_null()) { 1970 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1971 } 1972 oop method; 1973 if (!m->is_initializer() || m->is_static()) { 1974 method = Reflection::new_method(m, true, CHECK_NULL); 1975 } else { 1976 method = Reflection::new_constructor(m, CHECK_NULL); 1977 } 1978 return JNIHandles::make_local(method); 1979 } 1980 1981 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1982 { 1983 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1984 JvmtiVMObjectAllocEventCollector oam; 1985 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1986 bounds_check(cp, index, CHECK_NULL); 1987 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1988 return res; 1989 } 1990 JVM_END 1991 1992 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1993 { 1994 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 1995 JvmtiVMObjectAllocEventCollector oam; 1996 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1997 bounds_check(cp, index, CHECK_NULL); 1998 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 1999 return res; 2000 } 2001 JVM_END 2002 2003 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2004 constantTag tag = cp->tag_at(index); 2005 if (!tag.is_field()) { 2006 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2007 } 2008 int klass_ref = cp->uncached_klass_ref_index_at(index); 2009 Klass* k_o; 2010 if (force_resolution) { 2011 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2012 } else { 2013 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2014 if (k_o == NULL) return NULL; 2015 } 2016 InstanceKlass* k = InstanceKlass::cast(k_o); 2017 Symbol* name = cp->uncached_name_ref_at(index); 2018 Symbol* sig = cp->uncached_signature_ref_at(index); 2019 fieldDescriptor fd; 2020 Klass* target_klass = k->find_field(name, sig, &fd); 2021 if (target_klass == NULL) { 2022 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2023 } 2024 oop field = Reflection::new_field(&fd, CHECK_NULL); 2025 return JNIHandles::make_local(field); 2026 } 2027 2028 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2029 { 2030 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2031 JvmtiVMObjectAllocEventCollector oam; 2032 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2033 bounds_check(cp, index, CHECK_NULL); 2034 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2035 return res; 2036 } 2037 JVM_END 2038 2039 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2040 { 2041 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2042 JvmtiVMObjectAllocEventCollector oam; 2043 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2044 bounds_check(cp, index, CHECK_NULL); 2045 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2046 return res; 2047 } 2048 JVM_END 2049 2050 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2051 { 2052 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2053 JvmtiVMObjectAllocEventCollector oam; 2054 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2055 bounds_check(cp, index, CHECK_NULL); 2056 constantTag tag = cp->tag_at(index); 2057 if (!tag.is_field_or_method()) { 2058 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2059 } 2060 int klass_ref = cp->uncached_klass_ref_index_at(index); 2061 Symbol* klass_name = cp->klass_name_at(klass_ref); 2062 Symbol* member_name = cp->uncached_name_ref_at(index); 2063 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2064 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2065 objArrayHandle dest(THREAD, dest_o); 2066 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2067 dest->obj_at_put(0, str()); 2068 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2069 dest->obj_at_put(1, str()); 2070 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2071 dest->obj_at_put(2, str()); 2072 return (jobjectArray) JNIHandles::make_local(dest()); 2073 } 2074 JVM_END 2075 2076 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2077 { 2078 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2079 JvmtiVMObjectAllocEventCollector oam; 2080 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2081 bounds_check(cp, index, CHECK_0); 2082 constantTag tag = cp->tag_at(index); 2083 if (!tag.is_field_or_method()) { 2084 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2085 } 2086 return (jint) cp->uncached_klass_ref_index_at(index); 2087 } 2088 JVM_END 2089 2090 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2091 { 2092 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2093 JvmtiVMObjectAllocEventCollector oam; 2094 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2095 bounds_check(cp, index, CHECK_0); 2096 constantTag tag = cp->tag_at(index); 2097 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2098 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2099 } 2100 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2101 } 2102 JVM_END 2103 2104 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2105 { 2106 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2107 JvmtiVMObjectAllocEventCollector oam; 2108 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2109 bounds_check(cp, index, CHECK_NULL); 2110 constantTag tag = cp->tag_at(index); 2111 if (!tag.is_name_and_type()) { 2112 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2113 } 2114 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2115 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2116 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2117 objArrayHandle dest(THREAD, dest_o); 2118 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2119 dest->obj_at_put(0, str()); 2120 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2121 dest->obj_at_put(1, str()); 2122 return (jobjectArray) JNIHandles::make_local(dest()); 2123 } 2124 JVM_END 2125 2126 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2127 { 2128 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2129 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2130 bounds_check(cp, index, CHECK_0); 2131 constantTag tag = cp->tag_at(index); 2132 if (!tag.is_int()) { 2133 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2134 } 2135 return cp->int_at(index); 2136 } 2137 JVM_END 2138 2139 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2140 { 2141 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2142 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2143 bounds_check(cp, index, CHECK_(0L)); 2144 constantTag tag = cp->tag_at(index); 2145 if (!tag.is_long()) { 2146 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2147 } 2148 return cp->long_at(index); 2149 } 2150 JVM_END 2151 2152 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2153 { 2154 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2155 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2156 bounds_check(cp, index, CHECK_(0.0f)); 2157 constantTag tag = cp->tag_at(index); 2158 if (!tag.is_float()) { 2159 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2160 } 2161 return cp->float_at(index); 2162 } 2163 JVM_END 2164 2165 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2166 { 2167 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2168 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2169 bounds_check(cp, index, CHECK_(0.0)); 2170 constantTag tag = cp->tag_at(index); 2171 if (!tag.is_double()) { 2172 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2173 } 2174 return cp->double_at(index); 2175 } 2176 JVM_END 2177 2178 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2179 { 2180 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2181 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2182 bounds_check(cp, index, CHECK_NULL); 2183 constantTag tag = cp->tag_at(index); 2184 if (!tag.is_string()) { 2185 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2186 } 2187 oop str = cp->string_at(index, CHECK_NULL); 2188 return (jstring) JNIHandles::make_local(str); 2189 } 2190 JVM_END 2191 2192 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2193 { 2194 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2195 JvmtiVMObjectAllocEventCollector oam; 2196 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2197 bounds_check(cp, index, CHECK_NULL); 2198 constantTag tag = cp->tag_at(index); 2199 if (!tag.is_symbol()) { 2200 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2201 } 2202 Symbol* sym = cp->symbol_at(index); 2203 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2204 return (jstring) JNIHandles::make_local(str()); 2205 } 2206 JVM_END 2207 2208 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2209 { 2210 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2211 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2212 bounds_check(cp, index, CHECK_0); 2213 constantTag tag = cp->tag_at(index); 2214 jbyte result = tag.value(); 2215 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2216 // they are changed to the corresponding tags from the JVM spec, so that java code in 2217 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2218 if (tag.is_klass_or_reference()) { 2219 result = JVM_CONSTANT_Class; 2220 } else if (tag.is_string_index()) { 2221 result = JVM_CONSTANT_String; 2222 } else if (tag.is_method_type_in_error()) { 2223 result = JVM_CONSTANT_MethodType; 2224 } else if (tag.is_method_handle_in_error()) { 2225 result = JVM_CONSTANT_MethodHandle; 2226 } else if (tag.is_dynamic_constant_in_error()) { 2227 result = JVM_CONSTANT_Dynamic; 2228 } 2229 return result; 2230 } 2231 JVM_END 2232 2233 // Assertion support. ////////////////////////////////////////////////////////// 2234 2235 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2236 JVMWrapper("JVM_DesiredAssertionStatus"); 2237 assert(cls != NULL, "bad class"); 2238 2239 oop r = JNIHandles::resolve(cls); 2240 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2241 if (java_lang_Class::is_primitive(r)) return false; 2242 2243 Klass* k = java_lang_Class::as_Klass(r); 2244 assert(k->is_instance_klass(), "must be an instance klass"); 2245 if (!k->is_instance_klass()) return false; 2246 2247 ResourceMark rm(THREAD); 2248 const char* name = k->name()->as_C_string(); 2249 bool system_class = k->class_loader() == NULL; 2250 return JavaAssertions::enabled(name, system_class); 2251 2252 JVM_END 2253 2254 2255 // Return a new AssertionStatusDirectives object with the fields filled in with 2256 // command-line assertion arguments (i.e., -ea, -da). 2257 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2258 JVMWrapper("JVM_AssertionStatusDirectives"); 2259 JvmtiVMObjectAllocEventCollector oam; 2260 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2261 return JNIHandles::make_local(env, asd); 2262 JVM_END 2263 2264 // Arrays support ///////////////////////////////////////////////////////////// 2265 2266 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2267 JVMWrapper("JVM_ArrayIsAccessAtomic"); 2268 oop o = JNIHandles::resolve(array); 2269 Klass* k = o->klass(); 2270 if ((o == NULL) || (!k->is_array_klass())) { 2271 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2272 } 2273 if (k->is_valueArray_klass()) { 2274 return ValueArrayKlass::cast(k)->is_atomic(); 2275 } 2276 return true; 2277 JVM_END 2278 2279 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2280 JVMWrapper("JVM_ArrayEnsureAccessAtomic"); 2281 oop o = JNIHandles::resolve(array); 2282 Klass* k = o->klass(); 2283 if ((o == NULL) || (!k->is_array_klass())) { 2284 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2285 } 2286 if (k->is_valueArray_klass()) { 2287 ValueArrayKlass* vk = ValueArrayKlass::cast(k); 2288 if (!vk->is_atomic()) { 2289 /** 2290 * Need to decide how to implement: 2291 * 2292 * 1) Change to objArrayOop layout, therefore oop->klass() differs so 2293 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through 2294 * "checkcast" & "instanceof" 2295 * 2296 * 2) Use extra header in the valueArrayOop to flag atomicity required and 2297 * possibly per instance lock structure. Said info, could be placed in 2298 * "trailer" rather than disturb the current arrayOop 2299 */ 2300 Unimplemented(); 2301 } 2302 } 2303 return array; 2304 JVM_END 2305 2306 // Verification //////////////////////////////////////////////////////////////////////////////// 2307 2308 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2309 2310 // RedefineClasses support: bug 6214132 caused verification to fail. 2311 // All functions from this section should call the jvmtiThreadSate function: 2312 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2313 // The function returns a Klass* of the _scratch_class if the verifier 2314 // was invoked in the middle of the class redefinition. 2315 // Otherwise it returns its argument value which is the _the_class Klass*. 2316 // Please, refer to the description in the jvmtiThreadSate.hpp. 2317 2318 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2319 JVMWrapper("JVM_GetClassNameUTF"); 2320 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2321 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2322 return k->name()->as_utf8(); 2323 JVM_END 2324 2325 2326 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2327 JVMWrapper("JVM_GetClassCPTypes"); 2328 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2329 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2330 // types will have length zero if this is not an InstanceKlass 2331 // (length is determined by call to JVM_GetClassCPEntriesCount) 2332 if (k->is_instance_klass()) { 2333 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2334 for (int index = cp->length() - 1; index >= 0; index--) { 2335 constantTag tag = cp->tag_at(index); 2336 types[index] = tag.is_unresolved_klass() ? JVM_CONSTANT_Class : tag.value(); 2337 } 2338 } 2339 JVM_END 2340 2341 2342 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2343 JVMWrapper("JVM_GetClassCPEntriesCount"); 2344 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2345 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2346 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2347 JVM_END 2348 2349 2350 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2351 JVMWrapper("JVM_GetClassFieldsCount"); 2352 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2353 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2354 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2355 JVM_END 2356 2357 2358 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2359 JVMWrapper("JVM_GetClassMethodsCount"); 2360 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2361 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2362 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2363 JVM_END 2364 2365 2366 // The following methods, used for the verifier, are never called with 2367 // array klasses, so a direct cast to InstanceKlass is safe. 2368 // Typically, these methods are called in a loop with bounds determined 2369 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2370 // zero for arrays. 2371 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2372 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2373 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2374 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2375 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2376 int length = method->checked_exceptions_length(); 2377 if (length > 0) { 2378 CheckedExceptionElement* table= method->checked_exceptions_start(); 2379 for (int i = 0; i < length; i++) { 2380 exceptions[i] = table[i].class_cp_index; 2381 } 2382 } 2383 JVM_END 2384 2385 2386 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2387 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2388 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2389 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2390 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2391 return method->checked_exceptions_length(); 2392 JVM_END 2393 2394 2395 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2396 JVMWrapper("JVM_GetMethodIxByteCode"); 2397 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2398 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2399 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2400 memcpy(code, method->code_base(), method->code_size()); 2401 JVM_END 2402 2403 2404 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2405 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2406 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2407 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2408 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2409 return method->code_size(); 2410 JVM_END 2411 2412 2413 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2414 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2415 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2416 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2417 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2418 ExceptionTable extable(method); 2419 entry->start_pc = extable.start_pc(entry_index); 2420 entry->end_pc = extable.end_pc(entry_index); 2421 entry->handler_pc = extable.handler_pc(entry_index); 2422 entry->catchType = extable.catch_type_index(entry_index); 2423 JVM_END 2424 2425 2426 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2427 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2428 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2429 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2430 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2431 return method->exception_table_length(); 2432 JVM_END 2433 2434 2435 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2436 JVMWrapper("JVM_GetMethodIxModifiers"); 2437 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2438 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2439 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2440 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2441 JVM_END 2442 2443 2444 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2445 JVMWrapper("JVM_GetFieldIxModifiers"); 2446 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2447 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2448 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2449 JVM_END 2450 2451 2452 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2453 JVMWrapper("JVM_GetMethodIxLocalsCount"); 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->max_locals(); 2458 JVM_END 2459 2460 2461 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2462 JVMWrapper("JVM_GetMethodIxArgsSize"); 2463 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2464 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2465 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2466 return method->size_of_parameters(); 2467 JVM_END 2468 2469 2470 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2471 JVMWrapper("JVM_GetMethodIxMaxStack"); 2472 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2473 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2474 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2475 return method->verifier_max_stack(); 2476 JVM_END 2477 2478 2479 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2480 JVMWrapper("JVM_IsConstructorIx"); 2481 ResourceMark rm(THREAD); 2482 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2483 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2484 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2485 return method->name() == vmSymbols::object_initializer_name(); 2486 JVM_END 2487 2488 2489 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2490 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2491 ResourceMark rm(THREAD); 2492 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2493 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2494 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2495 return method->is_overpass(); 2496 JVM_END 2497 2498 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2499 JVMWrapper("JVM_GetMethodIxIxUTF"); 2500 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2501 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2502 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2503 return method->name()->as_utf8(); 2504 JVM_END 2505 2506 2507 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2508 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2509 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2510 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2511 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2512 return method->signature()->as_utf8(); 2513 JVM_END 2514 2515 /** 2516 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2517 * read entries in the constant pool. Since the old verifier always 2518 * works on a copy of the code, it will not see any rewriting that 2519 * may possibly occur in the middle of verification. So it is important 2520 * that nothing it calls tries to use the cpCache instead of the raw 2521 * constant pool, so we must use cp->uncached_x methods when appropriate. 2522 */ 2523 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2524 JVMWrapper("JVM_GetCPFieldNameUTF"); 2525 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2526 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2527 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2528 switch (cp->tag_at(cp_index).value()) { 2529 case JVM_CONSTANT_Fieldref: 2530 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2531 default: 2532 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2533 } 2534 ShouldNotReachHere(); 2535 return NULL; 2536 JVM_END 2537 2538 2539 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2540 JVMWrapper("JVM_GetCPMethodNameUTF"); 2541 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2542 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2543 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2544 switch (cp->tag_at(cp_index).value()) { 2545 case JVM_CONSTANT_InterfaceMethodref: 2546 case JVM_CONSTANT_Methodref: 2547 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2548 default: 2549 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2550 } 2551 ShouldNotReachHere(); 2552 return NULL; 2553 JVM_END 2554 2555 2556 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2557 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2558 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2559 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2560 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2561 switch (cp->tag_at(cp_index).value()) { 2562 case JVM_CONSTANT_InterfaceMethodref: 2563 case JVM_CONSTANT_Methodref: 2564 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2565 default: 2566 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2567 } 2568 ShouldNotReachHere(); 2569 return NULL; 2570 JVM_END 2571 2572 2573 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2574 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2575 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2576 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2577 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2578 switch (cp->tag_at(cp_index).value()) { 2579 case JVM_CONSTANT_Fieldref: 2580 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2581 default: 2582 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2583 } 2584 ShouldNotReachHere(); 2585 return NULL; 2586 JVM_END 2587 2588 2589 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2590 JVMWrapper("JVM_GetCPClassNameUTF"); 2591 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2592 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2593 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2594 Symbol* classname = cp->klass_name_at(cp_index); 2595 return classname->as_utf8(); 2596 JVM_END 2597 2598 2599 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2600 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2601 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2602 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2603 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2604 switch (cp->tag_at(cp_index).value()) { 2605 case JVM_CONSTANT_Fieldref: { 2606 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2607 Symbol* classname = cp->klass_name_at(class_index); 2608 return classname->as_utf8(); 2609 } 2610 default: 2611 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2612 } 2613 ShouldNotReachHere(); 2614 return NULL; 2615 JVM_END 2616 2617 2618 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2619 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2620 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2621 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2622 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2623 switch (cp->tag_at(cp_index).value()) { 2624 case JVM_CONSTANT_Methodref: 2625 case JVM_CONSTANT_InterfaceMethodref: { 2626 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2627 Symbol* classname = cp->klass_name_at(class_index); 2628 return classname->as_utf8(); 2629 } 2630 default: 2631 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2632 } 2633 ShouldNotReachHere(); 2634 return NULL; 2635 JVM_END 2636 2637 2638 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2639 JVMWrapper("JVM_GetCPFieldModifiers"); 2640 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2641 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2642 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2643 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2644 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2645 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2646 switch (cp->tag_at(cp_index).value()) { 2647 case JVM_CONSTANT_Fieldref: { 2648 Symbol* name = cp->uncached_name_ref_at(cp_index); 2649 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2650 InstanceKlass* ik = InstanceKlass::cast(k_called); 2651 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2652 if (fs.name() == name && fs.signature() == signature) { 2653 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2654 } 2655 } 2656 return -1; 2657 } 2658 default: 2659 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2660 } 2661 ShouldNotReachHere(); 2662 return 0; 2663 JVM_END 2664 2665 2666 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2667 JVMWrapper("JVM_GetCPMethodModifiers"); 2668 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2669 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2670 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2671 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2672 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2673 switch (cp->tag_at(cp_index).value()) { 2674 case JVM_CONSTANT_Methodref: 2675 case JVM_CONSTANT_InterfaceMethodref: { 2676 Symbol* name = cp->uncached_name_ref_at(cp_index); 2677 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2678 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2679 int methods_count = methods->length(); 2680 for (int i = 0; i < methods_count; i++) { 2681 Method* method = methods->at(i); 2682 if (method->name() == name && method->signature() == signature) { 2683 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2684 } 2685 } 2686 return -1; 2687 } 2688 default: 2689 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2690 } 2691 ShouldNotReachHere(); 2692 return 0; 2693 JVM_END 2694 2695 2696 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2697 2698 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2699 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2700 JVM_END 2701 2702 2703 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2704 JVMWrapper("JVM_IsSameClassPackage"); 2705 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2706 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2707 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2708 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2709 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2710 JVM_END 2711 2712 // Printing support ////////////////////////////////////////////////// 2713 extern "C" { 2714 2715 ATTRIBUTE_PRINTF(3, 0) 2716 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2717 // Reject count values that are negative signed values converted to 2718 // unsigned; see bug 4399518, 4417214 2719 if ((intptr_t)count <= 0) return -1; 2720 2721 int result = os::vsnprintf(str, count, fmt, args); 2722 if (result > 0 && (size_t)result >= count) { 2723 result = -1; 2724 } 2725 2726 return result; 2727 } 2728 2729 ATTRIBUTE_PRINTF(3, 4) 2730 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2731 va_list args; 2732 int len; 2733 va_start(args, fmt); 2734 len = jio_vsnprintf(str, count, fmt, args); 2735 va_end(args); 2736 return len; 2737 } 2738 2739 ATTRIBUTE_PRINTF(2, 3) 2740 int jio_fprintf(FILE* f, const char *fmt, ...) { 2741 int len; 2742 va_list args; 2743 va_start(args, fmt); 2744 len = jio_vfprintf(f, fmt, args); 2745 va_end(args); 2746 return len; 2747 } 2748 2749 ATTRIBUTE_PRINTF(2, 0) 2750 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2751 if (Arguments::vfprintf_hook() != NULL) { 2752 return Arguments::vfprintf_hook()(f, fmt, args); 2753 } else { 2754 return vfprintf(f, fmt, args); 2755 } 2756 } 2757 2758 ATTRIBUTE_PRINTF(1, 2) 2759 JNIEXPORT int jio_printf(const char *fmt, ...) { 2760 int len; 2761 va_list args; 2762 va_start(args, fmt); 2763 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2764 va_end(args); 2765 return len; 2766 } 2767 2768 2769 // HotSpot specific jio method 2770 void jio_print(const char* s) { 2771 // Try to make this function as atomic as possible. 2772 if (Arguments::vfprintf_hook() != NULL) { 2773 jio_fprintf(defaultStream::output_stream(), "%s", s); 2774 } else { 2775 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2776 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2777 } 2778 } 2779 2780 } // Extern C 2781 2782 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2783 2784 // In most of the JVM thread support functions we need to access the 2785 // thread through a ThreadsListHandle to prevent it from exiting and 2786 // being reclaimed while we try to operate on it. The exceptions to this 2787 // rule are when operating on the current thread, or if the monitor of 2788 // the target java.lang.Thread is locked at the Java level - in both 2789 // cases the target cannot exit. 2790 2791 static void thread_entry(JavaThread* thread, TRAPS) { 2792 HandleMark hm(THREAD); 2793 Handle obj(THREAD, thread->threadObj()); 2794 JavaValue result(T_VOID); 2795 JavaCalls::call_virtual(&result, 2796 obj, 2797 SystemDictionary::Thread_klass(), 2798 vmSymbols::run_method_name(), 2799 vmSymbols::void_method_signature(), 2800 THREAD); 2801 } 2802 2803 2804 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2805 JVMWrapper("JVM_StartThread"); 2806 JavaThread *native_thread = NULL; 2807 2808 // We cannot hold the Threads_lock when we throw an exception, 2809 // due to rank ordering issues. Example: we might need to grab the 2810 // Heap_lock while we construct the exception. 2811 bool throw_illegal_thread_state = false; 2812 2813 // We must release the Threads_lock before we can post a jvmti event 2814 // in Thread::start. 2815 { 2816 // Ensure that the C++ Thread and OSThread structures aren't freed before 2817 // we operate. 2818 MutexLocker mu(Threads_lock); 2819 2820 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2821 // re-starting an already started thread, so we should usually find 2822 // that the JavaThread is null. However for a JNI attached thread 2823 // there is a small window between the Thread object being created 2824 // (with its JavaThread set) and the update to its threadStatus, so we 2825 // have to check for this 2826 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2827 throw_illegal_thread_state = true; 2828 } else { 2829 // We could also check the stillborn flag to see if this thread was already stopped, but 2830 // for historical reasons we let the thread detect that itself when it starts running 2831 2832 jlong size = 2833 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2834 // Allocate the C++ Thread structure and create the native thread. The 2835 // stack size retrieved from java is 64-bit signed, but the constructor takes 2836 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2837 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2838 // - Avoid passing negative values which would result in really large stacks. 2839 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2840 size_t sz = size > 0 ? (size_t) size : 0; 2841 native_thread = new JavaThread(&thread_entry, sz); 2842 2843 // At this point it may be possible that no osthread was created for the 2844 // JavaThread due to lack of memory. Check for this situation and throw 2845 // an exception if necessary. Eventually we may want to change this so 2846 // that we only grab the lock if the thread was created successfully - 2847 // then we can also do this check and throw the exception in the 2848 // JavaThread constructor. 2849 if (native_thread->osthread() != NULL) { 2850 // Note: the current thread is not being used within "prepare". 2851 native_thread->prepare(jthread); 2852 } 2853 } 2854 } 2855 2856 if (throw_illegal_thread_state) { 2857 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2858 } 2859 2860 assert(native_thread != NULL, "Starting null thread?"); 2861 2862 if (native_thread->osthread() == NULL) { 2863 // No one should hold a reference to the 'native_thread'. 2864 native_thread->smr_delete(); 2865 if (JvmtiExport::should_post_resource_exhausted()) { 2866 JvmtiExport::post_resource_exhausted( 2867 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2868 os::native_thread_creation_failed_msg()); 2869 } 2870 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2871 os::native_thread_creation_failed_msg()); 2872 } 2873 2874 Thread::start(native_thread); 2875 2876 JVM_END 2877 2878 2879 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2880 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2881 // but is thought to be reliable and simple. In the case, where the receiver is the 2882 // same thread as the sender, no VM_Operation is needed. 2883 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2884 JVMWrapper("JVM_StopThread"); 2885 2886 // A nested ThreadsListHandle will grab the Threads_lock so create 2887 // tlh before we resolve throwable. 2888 ThreadsListHandle tlh(thread); 2889 oop java_throwable = JNIHandles::resolve(throwable); 2890 if (java_throwable == NULL) { 2891 THROW(vmSymbols::java_lang_NullPointerException()); 2892 } 2893 oop java_thread = NULL; 2894 JavaThread* receiver = NULL; 2895 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2896 Events::log_exception(thread, 2897 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2898 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2899 2900 if (is_alive) { 2901 // jthread refers to a live JavaThread. 2902 if (thread == receiver) { 2903 // Exception is getting thrown at self so no VM_Operation needed. 2904 THROW_OOP(java_throwable); 2905 } else { 2906 // Use a VM_Operation to throw the exception. 2907 Thread::send_async_exception(java_thread, java_throwable); 2908 } 2909 } else { 2910 // Either: 2911 // - target thread has not been started before being stopped, or 2912 // - target thread already terminated 2913 // We could read the threadStatus to determine which case it is 2914 // but that is overkill as it doesn't matter. We must set the 2915 // stillborn flag for the first case, and if the thread has already 2916 // exited setting this flag has no effect. 2917 java_lang_Thread::set_stillborn(java_thread); 2918 } 2919 JVM_END 2920 2921 2922 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2923 JVMWrapper("JVM_IsThreadAlive"); 2924 2925 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2926 return java_lang_Thread::is_alive(thread_oop); 2927 JVM_END 2928 2929 2930 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2931 JVMWrapper("JVM_SuspendThread"); 2932 2933 ThreadsListHandle tlh(thread); 2934 JavaThread* receiver = NULL; 2935 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2936 if (is_alive) { 2937 // jthread refers to a live JavaThread. 2938 { 2939 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2940 if (receiver->is_external_suspend()) { 2941 // Don't allow nested external suspend requests. We can't return 2942 // an error from this interface so just ignore the problem. 2943 return; 2944 } 2945 if (receiver->is_exiting()) { // thread is in the process of exiting 2946 return; 2947 } 2948 receiver->set_external_suspend(); 2949 } 2950 2951 // java_suspend() will catch threads in the process of exiting 2952 // and will ignore them. 2953 receiver->java_suspend(); 2954 2955 // It would be nice to have the following assertion in all the 2956 // time, but it is possible for a racing resume request to have 2957 // resumed this thread right after we suspended it. Temporarily 2958 // enable this assertion if you are chasing a different kind of 2959 // bug. 2960 // 2961 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2962 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2963 } 2964 JVM_END 2965 2966 2967 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2968 JVMWrapper("JVM_ResumeThread"); 2969 2970 ThreadsListHandle tlh(thread); 2971 JavaThread* receiver = NULL; 2972 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2973 if (is_alive) { 2974 // jthread refers to a live JavaThread. 2975 2976 // This is the original comment for this Threads_lock grab: 2977 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2978 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2979 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2980 // looks at it. 2981 // 2982 // The above comment dates back to when we had both internal and 2983 // external suspend APIs that shared a common underlying mechanism. 2984 // External suspend is now entirely cooperative and doesn't share 2985 // anything with internal suspend. That said, there are some 2986 // assumptions in the VM that an external resume grabs the 2987 // Threads_lock. We can't drop the Threads_lock grab here until we 2988 // resolve the assumptions that exist elsewhere. 2989 // 2990 MutexLocker ml(Threads_lock); 2991 receiver->java_resume(); 2992 } 2993 JVM_END 2994 2995 2996 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2997 JVMWrapper("JVM_SetThreadPriority"); 2998 2999 ThreadsListHandle tlh(thread); 3000 oop java_thread = NULL; 3001 JavaThread* receiver = NULL; 3002 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3003 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3004 3005 if (is_alive) { 3006 // jthread refers to a live JavaThread. 3007 Thread::set_priority(receiver, (ThreadPriority)prio); 3008 } 3009 // Implied else: If the JavaThread hasn't started yet, then the 3010 // priority set in the java.lang.Thread object above will be pushed 3011 // down when it does start. 3012 JVM_END 3013 3014 3015 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3016 JVMWrapper("JVM_Yield"); 3017 if (os::dont_yield()) return; 3018 HOTSPOT_THREAD_YIELD(); 3019 os::naked_yield(); 3020 JVM_END 3021 3022 3023 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3024 JVMWrapper("JVM_Sleep"); 3025 3026 if (millis < 0) { 3027 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3028 } 3029 3030 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 3031 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3032 } 3033 3034 // Save current thread state and restore it at the end of this block. 3035 // And set new thread state to SLEEPING. 3036 JavaThreadSleepState jtss(thread); 3037 3038 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3039 3040 EventThreadSleep event; 3041 3042 if (millis == 0) { 3043 os::naked_yield(); 3044 } else { 3045 ThreadState old_state = thread->osthread()->get_state(); 3046 thread->osthread()->set_state(SLEEPING); 3047 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3048 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3049 // us while we were sleeping. We do not overwrite those. 3050 if (!HAS_PENDING_EXCEPTION) { 3051 if (event.should_commit()) { 3052 event.set_time(millis); 3053 event.commit(); 3054 } 3055 HOTSPOT_THREAD_SLEEP_END(1); 3056 3057 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3058 // to properly restore the thread state. That's likely wrong. 3059 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3060 } 3061 } 3062 thread->osthread()->set_state(old_state); 3063 } 3064 if (event.should_commit()) { 3065 event.set_time(millis); 3066 event.commit(); 3067 } 3068 HOTSPOT_THREAD_SLEEP_END(0); 3069 JVM_END 3070 3071 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3072 JVMWrapper("JVM_CurrentThread"); 3073 oop jthread = thread->threadObj(); 3074 assert (thread != NULL, "no current thread!"); 3075 return JNIHandles::make_local(env, jthread); 3076 JVM_END 3077 3078 3079 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3080 JVMWrapper("JVM_CountStackFrames"); 3081 3082 uint32_t debug_bits = 0; 3083 ThreadsListHandle tlh(thread); 3084 JavaThread* receiver = NULL; 3085 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3086 int count = 0; 3087 if (is_alive) { 3088 // jthread refers to a live JavaThread. 3089 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) { 3090 // Count all java activation, i.e., number of vframes. 3091 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) { 3092 // Native frames are not counted. 3093 if (!vfst.method()->is_native()) count++; 3094 } 3095 } else { 3096 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3097 "this thread is not suspended"); 3098 } 3099 } 3100 // Implied else: if JavaThread is not alive simply return a count of 0. 3101 3102 return count; 3103 JVM_END 3104 3105 3106 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3107 JVMWrapper("JVM_Interrupt"); 3108 3109 ThreadsListHandle tlh(thread); 3110 JavaThread* receiver = NULL; 3111 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3112 if (is_alive) { 3113 // jthread refers to a live JavaThread. 3114 Thread::interrupt(receiver); 3115 } 3116 JVM_END 3117 3118 3119 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3120 JVMWrapper("JVM_IsInterrupted"); 3121 3122 ThreadsListHandle tlh(thread); 3123 JavaThread* receiver = NULL; 3124 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3125 if (is_alive) { 3126 // jthread refers to a live JavaThread. 3127 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0); 3128 } else { 3129 return JNI_FALSE; 3130 } 3131 JVM_END 3132 3133 3134 // Return true iff the current thread has locked the object passed in 3135 3136 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3137 JVMWrapper("JVM_HoldsLock"); 3138 assert(THREAD->is_Java_thread(), "sanity check"); 3139 if (obj == NULL) { 3140 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3141 } 3142 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3143 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3144 JVM_END 3145 3146 3147 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3148 JVMWrapper("JVM_DumpAllStacks"); 3149 VM_PrintThreads op; 3150 VMThread::execute(&op); 3151 if (JvmtiExport::should_post_data_dump()) { 3152 JvmtiExport::post_data_dump(); 3153 } 3154 JVM_END 3155 3156 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3157 JVMWrapper("JVM_SetNativeThreadName"); 3158 3159 // We don't use a ThreadsListHandle here because the current thread 3160 // must be alive. 3161 oop java_thread = JNIHandles::resolve_non_null(jthread); 3162 JavaThread* thr = java_lang_Thread::thread(java_thread); 3163 if (thread == thr && !thr->has_attached_via_jni()) { 3164 // Thread naming is only supported for the current thread and 3165 // we don't set the name of an attached thread to avoid stepping 3166 // on other programs. 3167 ResourceMark rm(thread); 3168 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3169 os::set_native_thread_name(thread_name); 3170 } 3171 JVM_END 3172 3173 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3174 3175 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3176 JVMWrapper("JVM_GetClassContext"); 3177 ResourceMark rm(THREAD); 3178 JvmtiVMObjectAllocEventCollector oam; 3179 vframeStream vfst(thread); 3180 3181 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3182 // This must only be called from SecurityManager.getClassContext 3183 Method* m = vfst.method(); 3184 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3185 m->name() == vmSymbols::getClassContext_name() && 3186 m->signature() == vmSymbols::void_class_array_signature())) { 3187 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3188 } 3189 } 3190 3191 // Collect method holders 3192 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3193 for (; !vfst.at_end(); vfst.security_next()) { 3194 Method* m = vfst.method(); 3195 // Native frames are not returned 3196 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3197 Klass* holder = m->method_holder(); 3198 assert(holder->is_klass(), "just checking"); 3199 klass_array->append(holder); 3200 } 3201 } 3202 3203 // Create result array of type [Ljava/lang/Class; 3204 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3205 // Fill in mirrors corresponding to method holders 3206 for (int i = 0; i < klass_array->length(); i++) { 3207 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3208 } 3209 3210 return (jobjectArray) JNIHandles::make_local(env, result); 3211 JVM_END 3212 3213 3214 // java.lang.Package //////////////////////////////////////////////////////////////// 3215 3216 3217 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3218 JVMWrapper("JVM_GetSystemPackage"); 3219 ResourceMark rm(THREAD); 3220 JvmtiVMObjectAllocEventCollector oam; 3221 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3222 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3223 return (jstring) JNIHandles::make_local(result); 3224 JVM_END 3225 3226 3227 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3228 JVMWrapper("JVM_GetSystemPackages"); 3229 JvmtiVMObjectAllocEventCollector oam; 3230 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3231 return (jobjectArray) JNIHandles::make_local(result); 3232 JVM_END 3233 3234 3235 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3236 3237 3238 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3239 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3240 3241 MonitorLockerEx ml(Heap_lock); 3242 oop ref = Universe::reference_pending_list(); 3243 if (ref != NULL) { 3244 Universe::set_reference_pending_list(NULL); 3245 } 3246 return JNIHandles::make_local(env, ref); 3247 JVM_END 3248 3249 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3250 JVMWrapper("JVM_HasReferencePendingList"); 3251 MonitorLockerEx ml(Heap_lock); 3252 return Universe::has_reference_pending_list(); 3253 JVM_END 3254 3255 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3256 JVMWrapper("JVM_WaitForReferencePendingList"); 3257 MonitorLockerEx ml(Heap_lock); 3258 while (!Universe::has_reference_pending_list()) { 3259 ml.wait(); 3260 } 3261 JVM_END 3262 3263 3264 // ObjectInputStream /////////////////////////////////////////////////////////////// 3265 3266 // Return the first user-defined class loader up the execution stack, or null 3267 // if only code from the bootstrap or platform class loader is on the stack. 3268 3269 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3270 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3271 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3272 oop loader = vfst.method()->method_holder()->class_loader(); 3273 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3274 return JNIHandles::make_local(env, loader); 3275 } 3276 } 3277 return NULL; 3278 JVM_END 3279 3280 3281 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3282 3283 3284 // resolve array handle and check arguments 3285 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3286 if (arr == NULL) { 3287 THROW_0(vmSymbols::java_lang_NullPointerException()); 3288 } 3289 oop a = JNIHandles::resolve_non_null(arr); 3290 if (!a->is_array()) { 3291 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3292 } else if (type_array_only && !a->is_typeArray()) { 3293 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3294 } 3295 return arrayOop(a); 3296 } 3297 3298 3299 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3300 JVMWrapper("JVM_GetArrayLength"); 3301 arrayOop a = check_array(env, arr, false, CHECK_0); 3302 return a->length(); 3303 JVM_END 3304 3305 3306 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3307 JVMWrapper("JVM_Array_Get"); 3308 JvmtiVMObjectAllocEventCollector oam; 3309 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3310 jvalue value; 3311 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3312 oop box = Reflection::box(&value, type, CHECK_NULL); 3313 return JNIHandles::make_local(env, box); 3314 JVM_END 3315 3316 3317 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3318 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3319 jvalue value; 3320 value.i = 0; // to initialize value before getting used in CHECK 3321 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3322 assert(a->is_typeArray(), "just checking"); 3323 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3324 BasicType wide_type = (BasicType) wCode; 3325 if (type != wide_type) { 3326 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3327 } 3328 return value; 3329 JVM_END 3330 3331 3332 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3333 JVMWrapper("JVM_SetArrayElement"); 3334 arrayOop a = check_array(env, arr, false, CHECK); 3335 oop box = JNIHandles::resolve(val); 3336 jvalue value; 3337 value.i = 0; // to initialize value before getting used in CHECK 3338 BasicType value_type; 3339 if (a->is_objArray()) { 3340 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3341 value_type = Reflection::unbox_for_regular_object(box, &value); 3342 } else { 3343 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3344 } 3345 Reflection::array_set(&value, a, index, value_type, CHECK); 3346 JVM_END 3347 3348 3349 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3350 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3351 arrayOop a = check_array(env, arr, true, CHECK); 3352 assert(a->is_typeArray(), "just checking"); 3353 BasicType value_type = (BasicType) vCode; 3354 Reflection::array_set(&v, a, index, value_type, CHECK); 3355 JVM_END 3356 3357 3358 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3359 JVMWrapper("JVM_NewArray"); 3360 JvmtiVMObjectAllocEventCollector oam; 3361 oop element_mirror = JNIHandles::resolve(eltClass); 3362 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3363 return JNIHandles::make_local(env, result); 3364 JVM_END 3365 3366 3367 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3368 JVMWrapper("JVM_NewMultiArray"); 3369 JvmtiVMObjectAllocEventCollector oam; 3370 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3371 oop element_mirror = JNIHandles::resolve(eltClass); 3372 assert(dim_array->is_typeArray(), "just checking"); 3373 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3374 return JNIHandles::make_local(env, result); 3375 JVM_END 3376 3377 3378 // Library support /////////////////////////////////////////////////////////////////////////// 3379 3380 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3381 //%note jvm_ct 3382 JVMWrapper("JVM_LoadLibrary"); 3383 char ebuf[1024]; 3384 void *load_result; 3385 { 3386 ThreadToNativeFromVM ttnfvm(thread); 3387 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3388 } 3389 if (load_result == NULL) { 3390 char msg[1024]; 3391 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3392 // Since 'ebuf' may contain a string encoded using 3393 // platform encoding scheme, we need to pass 3394 // Exceptions::unsafe_to_utf8 to the new_exception method 3395 // as the last argument. See bug 6367357. 3396 Handle h_exception = 3397 Exceptions::new_exception(thread, 3398 vmSymbols::java_lang_UnsatisfiedLinkError(), 3399 msg, Exceptions::unsafe_to_utf8); 3400 3401 THROW_HANDLE_0(h_exception); 3402 } 3403 return load_result; 3404 JVM_END 3405 3406 3407 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3408 JVMWrapper("JVM_UnloadLibrary"); 3409 os::dll_unload(handle); 3410 JVM_END 3411 3412 3413 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3414 JVMWrapper("JVM_FindLibraryEntry"); 3415 return os::dll_lookup(handle, name); 3416 JVM_END 3417 3418 3419 // JNI version /////////////////////////////////////////////////////////////////////////////// 3420 3421 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3422 JVMWrapper("JVM_IsSupportedJNIVersion"); 3423 return Threads::is_supported_jni_version_including_1_1(version); 3424 JVM_END 3425 3426 3427 // String support /////////////////////////////////////////////////////////////////////////// 3428 3429 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3430 JVMWrapper("JVM_InternString"); 3431 JvmtiVMObjectAllocEventCollector oam; 3432 if (str == NULL) return NULL; 3433 oop string = JNIHandles::resolve_non_null(str); 3434 oop result = StringTable::intern(string, CHECK_NULL); 3435 return (jstring) JNIHandles::make_local(env, result); 3436 JVM_END 3437 3438 3439 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3440 3441 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3442 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3443 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3444 // that only works with java threads. 3445 3446 3447 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3448 VM_Exit::block_if_vm_exited(); 3449 JVMWrapper("JVM_RawMonitorCreate"); 3450 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3451 } 3452 3453 3454 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3455 VM_Exit::block_if_vm_exited(); 3456 JVMWrapper("JVM_RawMonitorDestroy"); 3457 delete ((Mutex*) mon); 3458 } 3459 3460 3461 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3462 VM_Exit::block_if_vm_exited(); 3463 JVMWrapper("JVM_RawMonitorEnter"); 3464 ((Mutex*) mon)->jvm_raw_lock(); 3465 return 0; 3466 } 3467 3468 3469 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3470 VM_Exit::block_if_vm_exited(); 3471 JVMWrapper("JVM_RawMonitorExit"); 3472 ((Mutex*) mon)->jvm_raw_unlock(); 3473 } 3474 3475 3476 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3477 3478 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3479 Handle loader, Handle protection_domain, 3480 jboolean throwError, TRAPS) { 3481 // Security Note: 3482 // The Java level wrapper will perform the necessary security check allowing 3483 // us to pass the NULL as the initiating class loader. The VM is responsible for 3484 // the checkPackageAccess relative to the initiating class loader via the 3485 // protection_domain. The protection_domain is passed as NULL by the java code 3486 // if there is no security manager in 3-arg Class.forName(). 3487 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3488 3489 // Check if we should initialize the class 3490 if (init && klass->is_instance_klass()) { 3491 klass->initialize(CHECK_NULL); 3492 } 3493 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3494 } 3495 3496 3497 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3498 3499 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3500 JVMWrapper("JVM_InvokeMethod"); 3501 Handle method_handle; 3502 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3503 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3504 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3505 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3506 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3507 jobject res = JNIHandles::make_local(env, result); 3508 if (JvmtiExport::should_post_vm_object_alloc()) { 3509 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3510 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3511 if (java_lang_Class::is_primitive(ret_type)) { 3512 // Only for primitive type vm allocates memory for java object. 3513 // See box() method. 3514 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3515 } 3516 } 3517 return res; 3518 } else { 3519 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3520 } 3521 JVM_END 3522 3523 3524 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3525 JVMWrapper("JVM_NewInstanceFromConstructor"); 3526 oop constructor_mirror = JNIHandles::resolve(c); 3527 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3528 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3529 jobject res = JNIHandles::make_local(env, result); 3530 if (JvmtiExport::should_post_vm_object_alloc()) { 3531 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3532 } 3533 return res; 3534 JVM_END 3535 3536 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3537 3538 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3539 JVMWrapper("JVM_SupportsCX8"); 3540 return VM_Version::supports_cx8(); 3541 JVM_END 3542 3543 // Returns an array of all live Thread objects (VM internal JavaThreads, 3544 // jvmti agent threads, and JNI attaching threads are skipped) 3545 // See CR 6404306 regarding JNI attaching threads 3546 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3547 ResourceMark rm(THREAD); 3548 ThreadsListEnumerator tle(THREAD, false, false); 3549 JvmtiVMObjectAllocEventCollector oam; 3550 3551 int num_threads = tle.num_threads(); 3552 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3553 objArrayHandle threads_ah(THREAD, r); 3554 3555 for (int i = 0; i < num_threads; i++) { 3556 Handle h = tle.get_threadObj(i); 3557 threads_ah->obj_at_put(i, h()); 3558 } 3559 3560 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3561 JVM_END 3562 3563 3564 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3565 // Return StackTraceElement[][], each element is the stack trace of a thread in 3566 // the corresponding entry in the given threads array 3567 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3568 JVMWrapper("JVM_DumpThreads"); 3569 JvmtiVMObjectAllocEventCollector oam; 3570 3571 // Check if threads is null 3572 if (threads == NULL) { 3573 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3574 } 3575 3576 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3577 objArrayHandle ah(THREAD, a); 3578 int num_threads = ah->length(); 3579 // check if threads is non-empty array 3580 if (num_threads == 0) { 3581 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3582 } 3583 3584 // check if threads is not an array of objects of Thread class 3585 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3586 if (k != SystemDictionary::Thread_klass()) { 3587 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3588 } 3589 3590 ResourceMark rm(THREAD); 3591 3592 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3593 for (int i = 0; i < num_threads; i++) { 3594 oop thread_obj = ah->obj_at(i); 3595 instanceHandle h(THREAD, (instanceOop) thread_obj); 3596 thread_handle_array->append(h); 3597 } 3598 3599 // The JavaThread references in thread_handle_array are validated 3600 // in VM_ThreadDump::doit(). 3601 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3602 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3603 3604 JVM_END 3605 3606 // JVM monitoring and management support 3607 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3608 return Management::get_jmm_interface(version); 3609 JVM_END 3610 3611 // com.sun.tools.attach.VirtualMachine agent properties support 3612 // 3613 // Initialize the agent properties with the properties maintained in the VM 3614 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3615 JVMWrapper("JVM_InitAgentProperties"); 3616 ResourceMark rm; 3617 3618 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3619 3620 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3621 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3622 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3623 return properties; 3624 JVM_END 3625 3626 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3627 { 3628 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3629 JvmtiVMObjectAllocEventCollector oam; 3630 3631 if (ofClass == NULL) { 3632 return NULL; 3633 } 3634 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3635 // Special handling for primitive objects 3636 if (java_lang_Class::is_primitive(mirror())) { 3637 return NULL; 3638 } 3639 Klass* k = java_lang_Class::as_Klass(mirror()); 3640 if (!k->is_instance_klass()) { 3641 return NULL; 3642 } 3643 InstanceKlass* ik = InstanceKlass::cast(k); 3644 int encl_method_class_idx = ik->enclosing_method_class_index(); 3645 if (encl_method_class_idx == 0) { 3646 return NULL; 3647 } 3648 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3649 objArrayHandle dest(THREAD, dest_o); 3650 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3651 dest->obj_at_put(0, enc_k->java_mirror()); 3652 int encl_method_method_idx = ik->enclosing_method_method_index(); 3653 if (encl_method_method_idx != 0) { 3654 Symbol* sym = ik->constants()->symbol_at( 3655 extract_low_short_from_int( 3656 ik->constants()->name_and_type_at(encl_method_method_idx))); 3657 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3658 dest->obj_at_put(1, str()); 3659 sym = ik->constants()->symbol_at( 3660 extract_high_short_from_int( 3661 ik->constants()->name_and_type_at(encl_method_method_idx))); 3662 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3663 dest->obj_at_put(2, str()); 3664 } 3665 return (jobjectArray) JNIHandles::make_local(dest()); 3666 } 3667 JVM_END 3668 3669 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3670 { 3671 memset(info, 0, info_size); 3672 3673 info->jvm_version = Abstract_VM_Version::jvm_version(); 3674 info->patch_version = Abstract_VM_Version::vm_patch_version(); 3675 3676 // when we add a new capability in the jvm_version_info struct, we should also 3677 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3678 // counter defined in runtimeService.cpp. 3679 info->is_attach_supported = AttachListener::is_attach_supported(); 3680 } 3681 JVM_END 3682 3683 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3684 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3685 ResourceMark rm(THREAD); 3686 3687 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3688 return NULL; 3689 } 3690 3691 char** vm_flags = Arguments::jvm_flags_array(); 3692 char** vm_args = Arguments::jvm_args_array(); 3693 int num_flags = Arguments::num_jvm_flags(); 3694 int num_args = Arguments::num_jvm_args(); 3695 3696 InstanceKlass* ik = SystemDictionary::String_klass(); 3697 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3698 objArrayHandle result_h(THREAD, r); 3699 3700 int index = 0; 3701 for (int j = 0; j < num_flags; j++, index++) { 3702 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3703 result_h->obj_at_put(index, h()); 3704 } 3705 for (int i = 0; i < num_args; i++, index++) { 3706 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3707 result_h->obj_at_put(index, h()); 3708 } 3709 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3710 JVM_END 3711 3712 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3713 return os::get_signal_number(name); 3714 JVM_END