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 "classfile/classLoader.hpp" 27 #include "classfile/classLoaderData.inline.hpp" 28 #include "classfile/classLoaderExt.hpp" 29 #include "classfile/javaAssertions.hpp" 30 #include "classfile/javaClasses.hpp" 31 #include "classfile/symbolTable.hpp" 32 #include "classfile/systemDictionary.hpp" 33 #if INCLUDE_CDS 34 #include "classfile/sharedClassUtil.hpp" 35 #include "classfile/systemDictionaryShared.hpp" 36 #endif 37 #include "classfile/vmSymbols.hpp" 38 #include "gc_interface/collectedHeap.inline.hpp" 39 #include "interpreter/bytecode.hpp" 40 #include "memory/oopFactory.hpp" 41 #include "memory/referenceType.hpp" 42 #include "memory/universe.inline.hpp" 43 #include "oops/fieldStreams.hpp" 44 #include "oops/instanceKlass.hpp" 45 #include "oops/objArrayKlass.hpp" 46 #include "oops/method.hpp" 47 #include "prims/jvm.h" 48 #include "prims/jvm_misc.hpp" 49 #include "prims/jvmtiExport.hpp" 50 #include "prims/jvmtiThreadState.hpp" 51 #include "prims/nativeLookup.hpp" 52 #include "prims/privilegedStack.hpp" 53 #include "runtime/arguments.hpp" 54 #include "runtime/dtraceJSDT.hpp" 55 #include "runtime/handles.inline.hpp" 56 #include "runtime/init.hpp" 57 #include "runtime/interfaceSupport.hpp" 58 #include "runtime/java.hpp" 59 #include "runtime/javaCalls.hpp" 60 #include "runtime/jfieldIDWorkaround.hpp" 61 #include "runtime/orderAccess.inline.hpp" 62 #include "runtime/os.hpp" 63 #include "runtime/perfData.hpp" 64 #include "runtime/reflection.hpp" 65 #include "runtime/vframe.hpp" 66 #include "runtime/vm_operations.hpp" 67 #include "services/attachListener.hpp" 68 #include "services/management.hpp" 69 #include "services/threadService.hpp" 70 #include "trace/tracing.hpp" 71 #include "utilities/copy.hpp" 72 #include "utilities/defaultStream.hpp" 73 #include "utilities/dtrace.hpp" 74 #include "utilities/events.hpp" 75 #include "utilities/histogram.hpp" 76 #include "utilities/top.hpp" 77 #include "utilities/utf8.hpp" 78 #ifdef TARGET_OS_FAMILY_linux 79 # include "jvm_linux.h" 80 #endif 81 #ifdef TARGET_OS_FAMILY_solaris 82 # include "jvm_solaris.h" 83 #endif 84 #ifdef TARGET_OS_FAMILY_windows 85 # include "jvm_windows.h" 86 #endif 87 #ifdef TARGET_OS_FAMILY_aix 88 # include "jvm_aix.h" 89 #endif 90 #ifdef TARGET_OS_FAMILY_bsd 91 # include "jvm_bsd.h" 92 #endif 93 94 #if INCLUDE_ALL_GCS 95 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" 96 #endif // INCLUDE_ALL_GCS 97 98 #include <errno.h> 99 100 #ifndef USDT2 101 HS_DTRACE_PROBE_DECL1(hotspot, thread__sleep__begin, long long); 102 HS_DTRACE_PROBE_DECL1(hotspot, thread__sleep__end, int); 103 HS_DTRACE_PROBE_DECL0(hotspot, thread__yield); 104 #endif /* !USDT2 */ 105 106 /* 107 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 108 such ctors and calls MUST NOT come between an oop declaration/init and its 109 usage because if objects are move this may cause various memory stomps, bus 110 errors and segfaults. Here is a cookbook for causing so called "naked oop 111 failures": 112 113 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 114 JVMWrapper("JVM_GetClassDeclaredFields"); 115 116 // Object address to be held directly in mirror & not visible to GC 117 oop mirror = JNIHandles::resolve_non_null(ofClass); 118 119 // If this ctor can hit a safepoint, moving objects around, then 120 ComplexConstructor foo; 121 122 // Boom! mirror may point to JUNK instead of the intended object 123 (some dereference of mirror) 124 125 // Here's another call that may block for GC, making mirror stale 126 MutexLocker ml(some_lock); 127 128 // And here's an initializer that can result in a stale oop 129 // all in one step. 130 oop o = call_that_can_throw_exception(TRAPS); 131 132 133 The solution is to keep the oop declaration BELOW the ctor or function 134 call that might cause a GC, do another resolve to reassign the oop, or 135 consider use of a Handle instead of an oop so there is immunity from object 136 motion. But note that the "QUICK" entries below do not have a handlemark 137 and thus can only support use of handles passed in. 138 */ 139 140 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 141 ResourceMark rm; 142 int line_number = -1; 143 const char * source_file = NULL; 144 const char * trace = "explicit"; 145 InstanceKlass* caller = NULL; 146 JavaThread* jthread = JavaThread::current(); 147 if (jthread->has_last_Java_frame()) { 148 vframeStream vfst(jthread); 149 150 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 151 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 152 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 153 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 154 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 155 156 Method* last_caller = NULL; 157 158 while (!vfst.at_end()) { 159 Method* m = vfst.method(); 160 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 161 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 162 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 163 break; 164 } 165 last_caller = m; 166 vfst.next(); 167 } 168 // if this is called from Class.forName0 and that is called from Class.forName, 169 // then print the caller of Class.forName. If this is Class.loadClass, then print 170 // that caller, otherwise keep quiet since this should be picked up elsewhere. 171 bool found_it = false; 172 if (!vfst.at_end() && 173 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 174 vfst.method()->name() == vmSymbols::forName0_name()) { 175 vfst.next(); 176 if (!vfst.at_end() && 177 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 178 vfst.method()->name() == vmSymbols::forName_name()) { 179 vfst.next(); 180 found_it = true; 181 } 182 } else if (last_caller != NULL && 183 last_caller->method_holder()->name() == 184 vmSymbols::java_lang_ClassLoader() && 185 (last_caller->name() == vmSymbols::loadClassInternal_name() || 186 last_caller->name() == vmSymbols::loadClass_name())) { 187 found_it = true; 188 } else if (!vfst.at_end()) { 189 if (vfst.method()->is_native()) { 190 // JNI call 191 found_it = true; 192 } 193 } 194 if (found_it && !vfst.at_end()) { 195 // found the caller 196 caller = vfst.method()->method_holder(); 197 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 198 if (line_number == -1) { 199 // show method name if it's a native method 200 trace = vfst.method()->name_and_sig_as_C_string(); 201 } 202 Symbol* s = caller->source_file_name(); 203 if (s != NULL) { 204 source_file = s->as_C_string(); 205 } 206 } 207 } 208 if (caller != NULL) { 209 if (to_class != caller) { 210 const char * from = caller->external_name(); 211 const char * to = to_class->external_name(); 212 // print in a single call to reduce interleaving between threads 213 if (source_file != NULL) { 214 tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace); 215 } else { 216 tty->print("RESOLVE %s %s (%s)\n", from, to, trace); 217 } 218 } 219 } 220 } 221 222 void trace_class_resolution(Klass* to_class) { 223 EXCEPTION_MARK; 224 trace_class_resolution_impl(to_class, THREAD); 225 if (HAS_PENDING_EXCEPTION) { 226 CLEAR_PENDING_EXCEPTION; 227 } 228 } 229 230 // Wrapper to trace JVM functions 231 232 #ifdef ASSERT 233 class JVMTraceWrapper : public StackObj { 234 public: 235 JVMTraceWrapper(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) { 236 if (TraceJVMCalls) { 237 va_list ap; 238 va_start(ap, format); 239 tty->print("JVM "); 240 tty->vprint_cr(format, ap); 241 va_end(ap); 242 } 243 } 244 }; 245 246 Histogram* JVMHistogram; 247 volatile jint JVMHistogram_lock = 0; 248 249 class JVMHistogramElement : public HistogramElement { 250 public: 251 JVMHistogramElement(const char* name); 252 }; 253 254 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 255 _name = elementName; 256 uintx count = 0; 257 258 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 259 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 260 count +=1; 261 if ( (WarnOnStalledSpinLock > 0) 262 && (count % WarnOnStalledSpinLock == 0)) { 263 warning("JVMHistogram_lock seems to be stalled"); 264 } 265 } 266 } 267 268 if(JVMHistogram == NULL) 269 JVMHistogram = new Histogram("JVM Call Counts",100); 270 271 JVMHistogram->add_element(this); 272 Atomic::dec(&JVMHistogram_lock); 273 } 274 275 #define JVMCountWrapper(arg) \ 276 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 277 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 278 279 #define JVMWrapper(arg1) JVMCountWrapper(arg1); JVMTraceWrapper(arg1) 280 #define JVMWrapper2(arg1, arg2) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2) 281 #define JVMWrapper3(arg1, arg2, arg3) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3) 282 #define JVMWrapper4(arg1, arg2, arg3, arg4) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3, arg4) 283 #else 284 #define JVMWrapper(arg1) 285 #define JVMWrapper2(arg1, arg2) 286 #define JVMWrapper3(arg1, arg2, arg3) 287 #define JVMWrapper4(arg1, arg2, arg3, arg4) 288 #endif 289 290 291 // Interface version ///////////////////////////////////////////////////////////////////// 292 293 294 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 295 return JVM_INTERFACE_VERSION; 296 JVM_END 297 298 299 // java.lang.System ////////////////////////////////////////////////////////////////////// 300 301 302 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 303 JVMWrapper("JVM_CurrentTimeMillis"); 304 return os::javaTimeMillis(); 305 JVM_END 306 307 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 308 JVMWrapper("JVM_NanoTime"); 309 return os::javaTimeNanos(); 310 JVM_END 311 312 313 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 314 jobject dst, jint dst_pos, jint length)) 315 JVMWrapper("JVM_ArrayCopy"); 316 // Check if we have null pointers 317 if (src == NULL || dst == NULL) { 318 THROW(vmSymbols::java_lang_NullPointerException()); 319 } 320 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 321 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 322 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop"); 323 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop"); 324 // Do copy 325 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 326 JVM_END 327 328 329 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 330 JavaValue r(T_OBJECT); 331 // public synchronized Object put(Object key, Object value); 332 HandleMark hm(THREAD); 333 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 334 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 335 JavaCalls::call_virtual(&r, 336 props, 337 KlassHandle(THREAD, SystemDictionary::Properties_klass()), 338 vmSymbols::put_name(), 339 vmSymbols::object_object_object_signature(), 340 key_str, 341 value_str, 342 THREAD); 343 } 344 345 346 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 347 348 349 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 350 JVMWrapper("JVM_InitProperties"); 351 ResourceMark rm; 352 353 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 354 355 // System property list includes both user set via -D option and 356 // jvm system specific properties. 357 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 358 PUTPROP(props, p->key(), p->value()); 359 } 360 361 // Convert the -XX:MaxDirectMemorySize= command line flag 362 // to the sun.nio.MaxDirectMemorySize property. 363 // Do this after setting user properties to prevent people 364 // from setting the value with a -D option, as requested. 365 { 366 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 367 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 368 } else { 369 char as_chars[256]; 370 jio_snprintf(as_chars, sizeof(as_chars), UINTX_FORMAT, MaxDirectMemorySize); 371 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 372 } 373 } 374 375 // JVM monitoring and management support 376 // Add the sun.management.compiler property for the compiler's name 377 { 378 #undef CSIZE 379 #if defined(_LP64) || defined(_WIN64) 380 #define CSIZE "64-Bit " 381 #else 382 #define CSIZE 383 #endif // 64bit 384 385 #ifdef TIERED 386 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 387 #else 388 #if defined(COMPILER1) 389 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 390 #elif defined(COMPILER2) 391 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 392 #else 393 const char* compiler_name = ""; 394 #endif // compilers 395 #endif // TIERED 396 397 if (*compiler_name != '\0' && 398 (Arguments::mode() != Arguments::_int)) { 399 PUTPROP(props, "sun.management.compiler", compiler_name); 400 } 401 } 402 403 const char* enableSharedLookupCache = "false"; 404 #if INCLUDE_CDS 405 if (ClassLoaderExt::is_lookup_cache_enabled()) { 406 enableSharedLookupCache = "true"; 407 } 408 #endif 409 PUTPROP(props, "sun.cds.enableSharedLookupCache", enableSharedLookupCache); 410 411 return properties; 412 JVM_END 413 414 415 /* 416 * Return the temporary directory that the VM uses for the attach 417 * and perf data files. 418 * 419 * It is important that this directory is well-known and the 420 * same for all VM instances. It cannot be affected by configuration 421 * variables such as java.io.tmpdir. 422 */ 423 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 424 JVMWrapper("JVM_GetTemporaryDirectory"); 425 HandleMark hm(THREAD); 426 const char* temp_dir = os::get_temp_directory(); 427 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 428 return (jstring) JNIHandles::make_local(env, h()); 429 JVM_END 430 431 432 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 433 434 extern volatile jint vm_created; 435 436 JVM_ENTRY_NO_ENV(void, JVM_Exit(jint code)) 437 if (vm_created != 0 && (code == 0)) { 438 // The VM is about to exit. We call back into Java to check whether finalizers should be run 439 Universe::run_finalizers_on_exit(); 440 } 441 before_exit(thread); 442 vm_exit(code); 443 JVM_END 444 445 446 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 447 before_exit(thread); 448 vm_exit(code); 449 JVM_END 450 451 452 JVM_LEAF(void, JVM_OnExit(void (*func)(void))) 453 register_on_exit_function(func); 454 JVM_END 455 456 457 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 458 JVMWrapper("JVM_GC"); 459 if (!DisableExplicitGC) { 460 Universe::heap()->collect(GCCause::_java_lang_system_gc); 461 } 462 JVM_END 463 464 465 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 466 JVMWrapper("JVM_MaxObjectInspectionAge"); 467 return Universe::heap()->millis_since_last_gc(); 468 JVM_END 469 470 471 JVM_LEAF(void, JVM_TraceInstructions(jboolean on)) 472 if (PrintJVMWarnings) warning("JVM_TraceInstructions not supported"); 473 JVM_END 474 475 476 JVM_LEAF(void, JVM_TraceMethodCalls(jboolean on)) 477 if (PrintJVMWarnings) warning("JVM_TraceMethodCalls not supported"); 478 JVM_END 479 480 static inline jlong convert_size_t_to_jlong(size_t val) { 481 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 482 NOT_LP64 (return (jlong)val;) 483 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 484 } 485 486 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 487 JVMWrapper("JVM_TotalMemory"); 488 size_t n = Universe::heap()->capacity(); 489 return convert_size_t_to_jlong(n); 490 JVM_END 491 492 493 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 494 JVMWrapper("JVM_FreeMemory"); 495 CollectedHeap* ch = Universe::heap(); 496 size_t n; 497 { 498 MutexLocker x(Heap_lock); 499 n = ch->capacity() - ch->used(); 500 } 501 return convert_size_t_to_jlong(n); 502 JVM_END 503 504 505 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 506 JVMWrapper("JVM_MaxMemory"); 507 size_t n = Universe::heap()->max_capacity(); 508 return convert_size_t_to_jlong(n); 509 JVM_END 510 511 512 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 513 JVMWrapper("JVM_ActiveProcessorCount"); 514 return os::active_processor_count(); 515 JVM_END 516 517 518 519 // java.lang.Throwable ////////////////////////////////////////////////////// 520 521 522 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 523 JVMWrapper("JVM_FillInStackTrace"); 524 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 525 java_lang_Throwable::fill_in_stack_trace(exception); 526 JVM_END 527 528 529 JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable)) 530 JVMWrapper("JVM_GetStackTraceDepth"); 531 oop exception = JNIHandles::resolve(throwable); 532 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD); 533 JVM_END 534 535 536 JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index)) 537 JVMWrapper("JVM_GetStackTraceElement"); 538 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC 539 oop exception = JNIHandles::resolve(throwable); 540 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL); 541 return JNIHandles::make_local(env, element); 542 JVM_END 543 544 545 // java.lang.Object /////////////////////////////////////////////// 546 547 548 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 549 JVMWrapper("JVM_IHashCode"); 550 // as implemented in the classic virtual machine; return 0 if object is NULL 551 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 552 JVM_END 553 554 555 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 556 JVMWrapper("JVM_MonitorWait"); 557 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 558 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 559 if (JvmtiExport::should_post_monitor_wait()) { 560 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 561 562 // The current thread already owns the monitor and it has not yet 563 // been added to the wait queue so the current thread cannot be 564 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 565 // event handler cannot accidentally consume an unpark() meant for 566 // the ParkEvent associated with this ObjectMonitor. 567 } 568 ObjectSynchronizer::wait(obj, ms, CHECK); 569 JVM_END 570 571 572 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 573 JVMWrapper("JVM_MonitorNotify"); 574 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 575 ObjectSynchronizer::notify(obj, CHECK); 576 JVM_END 577 578 579 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 580 JVMWrapper("JVM_MonitorNotifyAll"); 581 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 582 ObjectSynchronizer::notifyall(obj, CHECK); 583 JVM_END 584 585 586 static void fixup_cloned_reference(ReferenceType ref_type, oop src, oop clone) { 587 // If G1 is enabled then we need to register a non-null referent 588 // with the SATB barrier. 589 #if INCLUDE_ALL_GCS 590 if (UseG1GC || (UseShenandoahGC && ShenandoahKeepAliveBarrier)) { 591 oop referent = java_lang_ref_Reference::referent(clone); 592 if (referent != NULL) { 593 G1SATBCardTableModRefBS::enqueue(referent); 594 } 595 } 596 #endif // INCLUDE_ALL_GCS 597 if ((java_lang_ref_Reference::next(clone) != NULL) || 598 (java_lang_ref_Reference::queue(clone) == java_lang_ref_ReferenceQueue::ENQUEUED_queue())) { 599 // If the source has been enqueued or is being enqueued, don't 600 // register the clone with a queue. 601 java_lang_ref_Reference::set_queue(clone, java_lang_ref_ReferenceQueue::NULL_queue()); 602 } 603 // discovered and next are list links; the clone is not in those lists. 604 java_lang_ref_Reference::set_discovered(clone, NULL); 605 java_lang_ref_Reference::set_next(clone, NULL); 606 } 607 608 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 609 JVMWrapper("JVM_Clone"); 610 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 611 const KlassHandle klass (THREAD, obj->klass()); 612 JvmtiVMObjectAllocEventCollector oam; 613 614 #ifdef ASSERT 615 // Just checking that the cloneable flag is set correct 616 if (obj->is_array()) { 617 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 618 } else { 619 guarantee(obj->is_instance(), "should be instanceOop"); 620 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 621 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 622 } 623 #endif 624 625 // Check if class of obj supports the Cloneable interface. 626 // All arrays are considered to be cloneable (See JLS 20.1.5) 627 if (!klass->is_cloneable()) { 628 ResourceMark rm(THREAD); 629 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 630 } 631 632 // Make shallow object copy 633 ReferenceType ref_type = REF_NONE; 634 const int size = obj->size(); 635 oop new_obj_oop = NULL; 636 if (obj->is_array()) { 637 const int length = ((arrayOop)obj())->length(); 638 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 639 } else { 640 ref_type = InstanceKlass::cast(klass())->reference_type(); 641 assert((ref_type == REF_NONE) == 642 !klass->is_subclass_of(SystemDictionary::Reference_klass()), 643 "invariant"); 644 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 645 } 646 647 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread 648 // is modifying a reference field in the clonee, a non-oop-atomic copy might 649 // be suspended in the middle of copying the pointer and end up with parts 650 // of two different pointers in the field. Subsequent dereferences will crash. 651 // 4846409: an oop-copy of objects with long or double fields or arrays of same 652 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead 653 // of oops. We know objects are aligned on a minimum of an jlong boundary. 654 // The same is true of StubRoutines::object_copy and the various oop_copy 655 // variants, and of the code generated by the inline_native_clone intrinsic. 656 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); 657 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop, 658 (size_t)align_object_size(size) / HeapWordsPerLong); 659 // Clear the header 660 new_obj_oop->init_mark(); 661 662 // Store check (mark entire object and let gc sort it out) 663 BarrierSet* bs = Universe::heap()->barrier_set(); 664 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); 665 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); 666 667 // If cloning a Reference, set Reference fields to a safe state. 668 // Fixup must be completed before any safepoint. 669 if (ref_type != REF_NONE) { 670 fixup_cloned_reference(ref_type, obj(), new_obj_oop); 671 } 672 673 Handle new_obj(THREAD, new_obj_oop); 674 // Special handling for MemberNames. Since they contain Method* metadata, they 675 // must be registered so that RedefineClasses can fix metadata contained in them. 676 if (java_lang_invoke_MemberName::is_instance(new_obj()) && 677 java_lang_invoke_MemberName::is_method(new_obj())) { 678 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj()); 679 // MemberName may be unresolved, so doesn't need registration until resolved. 680 if (method != NULL) { 681 methodHandle m(THREAD, method); 682 // This can safepoint and redefine method, so need both new_obj and method 683 // in a handle, for two different reasons. new_obj can move, method can be 684 // deleted if nothing is using it on the stack. 685 m->method_holder()->add_member_name(new_obj(), false); 686 } 687 } 688 689 // Caution: this involves a java upcall, so the clone should be 690 // "gc-robust" by this stage. 691 if (klass->has_finalizer()) { 692 assert(obj->is_instance(), "should be instanceOop"); 693 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 694 new_obj = Handle(THREAD, new_obj_oop); 695 } 696 697 return JNIHandles::make_local(env, new_obj()); 698 JVM_END 699 700 // java.lang.Compiler //////////////////////////////////////////////////// 701 702 // The initial cuts of the HotSpot VM will not support JITs, and all existing 703 // JITs would need extensive changes to work with HotSpot. The JIT-related JVM 704 // functions are all silently ignored unless JVM warnings are printed. 705 706 JVM_LEAF(void, JVM_InitializeCompiler (JNIEnv *env, jclass compCls)) 707 if (PrintJVMWarnings) warning("JVM_InitializeCompiler not supported"); 708 JVM_END 709 710 711 JVM_LEAF(jboolean, JVM_IsSilentCompiler(JNIEnv *env, jclass compCls)) 712 if (PrintJVMWarnings) warning("JVM_IsSilentCompiler not supported"); 713 return JNI_FALSE; 714 JVM_END 715 716 717 JVM_LEAF(jboolean, JVM_CompileClass(JNIEnv *env, jclass compCls, jclass cls)) 718 if (PrintJVMWarnings) warning("JVM_CompileClass not supported"); 719 return JNI_FALSE; 720 JVM_END 721 722 723 JVM_LEAF(jboolean, JVM_CompileClasses(JNIEnv *env, jclass cls, jstring jname)) 724 if (PrintJVMWarnings) warning("JVM_CompileClasses not supported"); 725 return JNI_FALSE; 726 JVM_END 727 728 729 JVM_LEAF(jobject, JVM_CompilerCommand(JNIEnv *env, jclass compCls, jobject arg)) 730 if (PrintJVMWarnings) warning("JVM_CompilerCommand not supported"); 731 return NULL; 732 JVM_END 733 734 735 JVM_LEAF(void, JVM_EnableCompiler(JNIEnv *env, jclass compCls)) 736 if (PrintJVMWarnings) warning("JVM_EnableCompiler not supported"); 737 JVM_END 738 739 740 JVM_LEAF(void, JVM_DisableCompiler(JNIEnv *env, jclass compCls)) 741 if (PrintJVMWarnings) warning("JVM_DisableCompiler not supported"); 742 JVM_END 743 744 745 746 // Error message support ////////////////////////////////////////////////////// 747 748 JVM_LEAF(jint, JVM_GetLastErrorString(char *buf, int len)) 749 JVMWrapper("JVM_GetLastErrorString"); 750 return (jint)os::lasterror(buf, len); 751 JVM_END 752 753 754 // java.io.File /////////////////////////////////////////////////////////////// 755 756 JVM_LEAF(char*, JVM_NativePath(char* path)) 757 JVMWrapper2("JVM_NativePath (%s)", path); 758 return os::native_path(path); 759 JVM_END 760 761 762 // java.nio.Bits /////////////////////////////////////////////////////////////// 763 764 #define MAX_OBJECT_SIZE \ 765 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \ 766 + ((julong)max_jint * sizeof(double)) ) 767 768 static inline jlong field_offset_to_byte_offset(jlong field_offset) { 769 return field_offset; 770 } 771 772 static inline void assert_field_offset_sane(oop p, jlong field_offset) { 773 #ifdef ASSERT 774 jlong byte_offset = field_offset_to_byte_offset(field_offset); 775 776 if (p != NULL) { 777 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset"); 778 if (byte_offset == (jint)byte_offset) { 779 void* ptr_plus_disp = (address)p + byte_offset; 780 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp, 781 "raw [ptr+disp] must be consistent with oop::field_base"); 782 } 783 jlong p_size = HeapWordSize * (jlong)(p->size()); 784 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT 785 " > object's size " INT64_FORMAT, 786 (int64_t)byte_offset, (int64_t)p_size)); 787 } 788 #endif 789 } 790 791 static inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) { 792 assert_field_offset_sane(p, field_offset); 793 jlong byte_offset = field_offset_to_byte_offset(field_offset); 794 795 if (sizeof(char*) == sizeof(jint)) { // (this constant folds!) 796 return (address)p + (jint) byte_offset; 797 } else { 798 return (address)p + byte_offset; 799 } 800 } 801 802 // This function is a leaf since if the source and destination are both in native memory 803 // the copy may potentially be very large, and we don't want to disable GC if we can avoid it. 804 // If either source or destination (or both) are on the heap, the function will enter VM using 805 // JVM_ENTRY_FROM_LEAF 806 JVM_LEAF(void, JVM_CopySwapMemory(JNIEnv *env, jobject srcObj, jlong srcOffset, 807 jobject dstObj, jlong dstOffset, jlong size, 808 jlong elemSize)) { 809 810 size_t sz = (size_t)size; 811 size_t esz = (size_t)elemSize; 812 813 if (srcObj == NULL && dstObj == NULL) { 814 // Both src & dst are in native memory 815 address src = (address)srcOffset; 816 address dst = (address)dstOffset; 817 818 Copy::conjoint_swap(src, dst, sz, esz); 819 } else { 820 // At least one of src/dst are on heap, transition to VM to access raw pointers 821 822 JVM_ENTRY_FROM_LEAF(env, void, JVM_CopySwapMemory) { 823 oop srcp = JNIHandles::resolve(srcObj); 824 oop dstp = JNIHandles::resolve(dstObj); 825 826 address src = (address)index_oop_from_field_offset_long(srcp, srcOffset); 827 address dst = (address)index_oop_from_field_offset_long(dstp, dstOffset); 828 829 Copy::conjoint_swap(src, dst, sz, esz); 830 } JVM_END 831 } 832 } JVM_END 833 834 835 // Misc. class handling /////////////////////////////////////////////////////////// 836 837 838 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 839 JVMWrapper("JVM_GetCallerClass"); 840 841 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 842 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 843 // temporarily for existing code to use until a replacement API is defined. 844 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 845 Klass* k = thread->security_get_caller_class(depth); 846 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 847 } 848 849 // Getting the class of the caller frame. 850 // 851 // The call stack at this point looks something like this: 852 // 853 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 854 // [1] [ @CallerSensitive API.method ] 855 // [.] [ (skipped intermediate frames) ] 856 // [n] [ caller ] 857 vframeStream vfst(thread); 858 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 859 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 860 Method* m = vfst.method(); 861 assert(m != NULL, "sanity"); 862 switch (n) { 863 case 0: 864 // This must only be called from Reflection.getCallerClass 865 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 866 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 867 } 868 // fall-through 869 case 1: 870 // Frame 0 and 1 must be caller sensitive. 871 if (!m->caller_sensitive()) { 872 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 873 } 874 break; 875 default: 876 if (!m->is_ignored_by_security_stack_walk()) { 877 // We have reached the desired frame; return the holder class. 878 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 879 } 880 break; 881 } 882 } 883 return NULL; 884 JVM_END 885 886 887 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 888 JVMWrapper("JVM_FindPrimitiveClass"); 889 oop mirror = NULL; 890 BasicType t = name2type(utf); 891 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 892 mirror = Universe::java_mirror(t); 893 } 894 if (mirror == NULL) { 895 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 896 } else { 897 return (jclass) JNIHandles::make_local(env, mirror); 898 } 899 JVM_END 900 901 902 JVM_ENTRY(void, JVM_ResolveClass(JNIEnv* env, jclass cls)) 903 JVMWrapper("JVM_ResolveClass"); 904 if (PrintJVMWarnings) warning("JVM_ResolveClass not implemented"); 905 JVM_END 906 907 908 JVM_ENTRY(jboolean, JVM_KnownToNotExist(JNIEnv *env, jobject loader, const char *classname)) 909 JVMWrapper("JVM_KnownToNotExist"); 910 #if INCLUDE_CDS 911 return ClassLoaderExt::known_to_not_exist(env, loader, classname, CHECK_(false)); 912 #else 913 return false; 914 #endif 915 JVM_END 916 917 918 JVM_ENTRY(jobjectArray, JVM_GetResourceLookupCacheURLs(JNIEnv *env, jobject loader)) 919 JVMWrapper("JVM_GetResourceLookupCacheURLs"); 920 #if INCLUDE_CDS 921 return ClassLoaderExt::get_lookup_cache_urls(env, loader, CHECK_NULL); 922 #else 923 return NULL; 924 #endif 925 JVM_END 926 927 928 JVM_ENTRY(jintArray, JVM_GetResourceLookupCache(JNIEnv *env, jobject loader, const char *resource_name)) 929 JVMWrapper("JVM_GetResourceLookupCache"); 930 #if INCLUDE_CDS 931 return ClassLoaderExt::get_lookup_cache(env, loader, resource_name, CHECK_NULL); 932 #else 933 return NULL; 934 #endif 935 JVM_END 936 937 938 // Returns a class loaded by the bootstrap class loader; or null 939 // if not found. ClassNotFoundException is not thrown. 940 // 941 // Rationale behind JVM_FindClassFromBootLoader 942 // a> JVM_FindClassFromClassLoader was never exported in the export tables. 943 // b> because of (a) java.dll has a direct dependecy on the unexported 944 // private symbol "_JVM_FindClassFromClassLoader@20". 945 // c> the launcher cannot use the private symbol as it dynamically opens 946 // the entry point, so if something changes, the launcher will fail 947 // unexpectedly at runtime, it is safest for the launcher to dlopen a 948 // stable exported interface. 949 // d> re-exporting JVM_FindClassFromClassLoader as public, will cause its 950 // signature to change from _JVM_FindClassFromClassLoader@20 to 951 // JVM_FindClassFromClassLoader and will not be backward compatible 952 // with older JDKs. 953 // Thus a public/stable exported entry point is the right solution, 954 // public here means public in linker semantics, and is exported only 955 // to the JDK, and is not intended to be a public API. 956 957 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 958 const char* name)) 959 JVMWrapper2("JVM_FindClassFromBootLoader %s", name); 960 961 // Java libraries should ensure that name is never null... 962 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 963 // It's impossible to create this class; the name cannot fit 964 // into the constant pool. 965 return NULL; 966 } 967 968 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 969 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 970 if (k == NULL) { 971 return NULL; 972 } 973 974 if (TraceClassResolution) { 975 trace_class_resolution(k); 976 } 977 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 978 JVM_END 979 980 // Not used; JVM_FindClassFromCaller replaces this. 981 JVM_ENTRY(jclass, JVM_FindClassFromClassLoader(JNIEnv* env, const char* name, 982 jboolean init, jobject loader, 983 jboolean throwError)) 984 JVMWrapper3("JVM_FindClassFromClassLoader %s throw %s", name, 985 throwError ? "error" : "exception"); 986 // Java libraries should ensure that name is never null... 987 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 988 // It's impossible to create this class; the name cannot fit 989 // into the constant pool. 990 if (throwError) { 991 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 992 } else { 993 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 994 } 995 } 996 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 997 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 998 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 999 Handle(), throwError, THREAD); 1000 1001 if (TraceClassResolution && result != NULL) { 1002 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 1003 } 1004 return result; 1005 JVM_END 1006 1007 // Find a class with this name in this loader, using the caller's protection domain. 1008 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 1009 jboolean init, jobject loader, 1010 jclass caller)) 1011 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name); 1012 // Java libraries should ensure that name is never null... 1013 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 1014 // It's impossible to create this class; the name cannot fit 1015 // into the constant pool. 1016 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 1017 } 1018 1019 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 1020 1021 oop loader_oop = JNIHandles::resolve(loader); 1022 oop from_class = JNIHandles::resolve(caller); 1023 oop protection_domain = NULL; 1024 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 1025 // NPE. Put it in another way, the bootstrap class loader has all permission and 1026 // thus no checkPackageAccess equivalence in the VM class loader. 1027 // The caller is also passed as NULL by the java code if there is no security 1028 // manager to avoid the performance cost of getting the calling class. 1029 if (from_class != NULL && loader_oop != NULL) { 1030 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 1031 } 1032 1033 Handle h_loader(THREAD, loader_oop); 1034 Handle h_prot(THREAD, protection_domain); 1035 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 1036 h_prot, false, THREAD); 1037 1038 if (TraceClassResolution && result != NULL) { 1039 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 1040 } 1041 return result; 1042 JVM_END 1043 1044 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 1045 jboolean init, jclass from)) 1046 JVMWrapper2("JVM_FindClassFromClass %s", name); 1047 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 1048 // It's impossible to create this class; the name cannot fit 1049 // into the constant pool. 1050 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 1051 } 1052 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 1053 oop from_class_oop = JNIHandles::resolve(from); 1054 Klass* from_class = (from_class_oop == NULL) 1055 ? (Klass*)NULL 1056 : java_lang_Class::as_Klass(from_class_oop); 1057 oop class_loader = NULL; 1058 oop protection_domain = NULL; 1059 if (from_class != NULL) { 1060 class_loader = from_class->class_loader(); 1061 protection_domain = from_class->protection_domain(); 1062 } 1063 Handle h_loader(THREAD, class_loader); 1064 Handle h_prot (THREAD, protection_domain); 1065 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 1066 h_prot, true, thread); 1067 1068 if (TraceClassResolution && result != NULL) { 1069 // this function is generally only used for class loading during verification. 1070 ResourceMark rm; 1071 oop from_mirror = JNIHandles::resolve_non_null(from); 1072 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 1073 const char * from_name = from_class->external_name(); 1074 1075 oop mirror = JNIHandles::resolve_non_null(result); 1076 Klass* to_class = java_lang_Class::as_Klass(mirror); 1077 const char * to = to_class->external_name(); 1078 tty->print("RESOLVE %s %s (verification)\n", from_name, to); 1079 } 1080 1081 return result; 1082 JVM_END 1083 1084 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 1085 if (loader.is_null()) { 1086 return; 1087 } 1088 1089 // check whether the current caller thread holds the lock or not. 1090 // If not, increment the corresponding counter 1091 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 1092 ObjectSynchronizer::owner_self) { 1093 counter->inc(); 1094 } 1095 } 1096 1097 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 1098 // and JVM_DefineClassWithSourceCond() 1099 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 1100 jobject loader, const jbyte *buf, 1101 jsize len, jobject pd, const char *source, 1102 jboolean verify, TRAPS) { 1103 if (source == NULL) source = "__JVM_DefineClass__"; 1104 1105 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 1106 JavaThread* jt = (JavaThread*) THREAD; 1107 1108 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 1109 ClassLoader::perf_define_appclass_selftime(), 1110 ClassLoader::perf_define_appclasses(), 1111 jt->get_thread_stat()->perf_recursion_counts_addr(), 1112 jt->get_thread_stat()->perf_timers_addr(), 1113 PerfClassTraceTime::DEFINE_CLASS); 1114 1115 if (UsePerfData) { 1116 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 1117 } 1118 1119 // Since exceptions can be thrown, class initialization can take place 1120 // if name is NULL no check for class name in .class stream has to be made. 1121 TempNewSymbol class_name = NULL; 1122 if (name != NULL) { 1123 const int str_len = (int)strlen(name); 1124 if (str_len > Symbol::max_length()) { 1125 // It's impossible to create this class; the name cannot fit 1126 // into the constant pool. 1127 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 1128 } 1129 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 1130 } 1131 1132 ResourceMark rm(THREAD); 1133 ClassFileStream st((u1*) buf, len, (char *)source); 1134 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 1135 if (UsePerfData) { 1136 is_lock_held_by_thread(class_loader, 1137 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 1138 THREAD); 1139 } 1140 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1141 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader, 1142 protection_domain, &st, 1143 verify != 0, 1144 CHECK_NULL); 1145 1146 if (TraceClassResolution && k != NULL) { 1147 trace_class_resolution(k); 1148 } 1149 1150 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 1151 } 1152 1153 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1154 JVMWrapper2("JVM_DefineClass %s", name); 1155 1156 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD); 1157 JVM_END 1158 1159 1160 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1161 JVMWrapper2("JVM_DefineClassWithSource %s", name); 1162 1163 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD); 1164 JVM_END 1165 1166 JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name, 1167 jobject loader, const jbyte *buf, 1168 jsize len, jobject pd, 1169 const char *source, jboolean verify)) 1170 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name); 1171 1172 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD); 1173 JVM_END 1174 1175 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1176 JVMWrapper("JVM_FindLoadedClass"); 1177 ResourceMark rm(THREAD); 1178 1179 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1180 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 1181 1182 const char* str = java_lang_String::as_utf8_string(string()); 1183 // Sanity check, don't expect null 1184 if (str == NULL) return NULL; 1185 1186 const int str_len = (int)strlen(str); 1187 if (str_len > Symbol::max_length()) { 1188 // It's impossible to create this class; the name cannot fit 1189 // into the constant pool. 1190 return NULL; 1191 } 1192 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 1193 1194 // Security Note: 1195 // The Java level wrapper will perform the necessary security check allowing 1196 // us to pass the NULL as the initiating class loader. 1197 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1198 if (UsePerfData) { 1199 is_lock_held_by_thread(h_loader, 1200 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1201 THREAD); 1202 } 1203 1204 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1205 h_loader, 1206 Handle(), 1207 CHECK_NULL); 1208 #if INCLUDE_CDS 1209 if (k == NULL) { 1210 // If the class is not already loaded, try to see if it's in the shared 1211 // archive for the current classloader (h_loader). 1212 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class( 1213 klass_name, h_loader, CHECK_NULL); 1214 k = ik(); 1215 } 1216 #endif 1217 return (k == NULL) ? NULL : 1218 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1219 JVM_END 1220 1221 1222 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1223 1224 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1225 assert (cls != NULL, "illegal class"); 1226 JVMWrapper("JVM_GetClassName"); 1227 JvmtiVMObjectAllocEventCollector oam; 1228 ResourceMark rm(THREAD); 1229 const char* name; 1230 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1231 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1232 } else { 1233 // Consider caching interned string in Klass 1234 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1235 assert(k->is_klass(), "just checking"); 1236 name = k->external_name(); 1237 } 1238 oop result = StringTable::intern((char*) name, CHECK_NULL); 1239 return (jstring) JNIHandles::make_local(env, result); 1240 JVM_END 1241 1242 1243 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1244 JVMWrapper("JVM_GetClassInterfaces"); 1245 JvmtiVMObjectAllocEventCollector oam; 1246 oop mirror = JNIHandles::resolve_non_null(cls); 1247 1248 // Special handling for primitive objects 1249 if (java_lang_Class::is_primitive(mirror)) { 1250 // Primitive objects does not have any interfaces 1251 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1252 return (jobjectArray) JNIHandles::make_local(env, r); 1253 } 1254 1255 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror)); 1256 // Figure size of result array 1257 int size; 1258 if (klass->oop_is_instance()) { 1259 size = InstanceKlass::cast(klass())->local_interfaces()->length(); 1260 } else { 1261 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass"); 1262 size = 2; 1263 } 1264 1265 // Allocate result array 1266 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1267 objArrayHandle result (THREAD, r); 1268 // Fill in result 1269 if (klass->oop_is_instance()) { 1270 // Regular instance klass, fill in all local interfaces 1271 for (int index = 0; index < size; index++) { 1272 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index); 1273 result->obj_at_put(index, k->java_mirror()); 1274 } 1275 } else { 1276 // All arrays implement java.lang.Cloneable and java.io.Serializable 1277 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1278 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1279 } 1280 return (jobjectArray) JNIHandles::make_local(env, result()); 1281 JVM_END 1282 1283 1284 JVM_ENTRY(jobject, JVM_GetClassLoader(JNIEnv *env, jclass cls)) 1285 JVMWrapper("JVM_GetClassLoader"); 1286 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1287 return NULL; 1288 } 1289 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1290 oop loader = k->class_loader(); 1291 return JNIHandles::make_local(env, loader); 1292 JVM_END 1293 1294 1295 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1296 JVMWrapper("JVM_IsInterface"); 1297 oop mirror = JNIHandles::resolve_non_null(cls); 1298 if (java_lang_Class::is_primitive(mirror)) { 1299 return JNI_FALSE; 1300 } 1301 Klass* k = java_lang_Class::as_Klass(mirror); 1302 jboolean result = k->is_interface(); 1303 assert(!result || k->oop_is_instance(), 1304 "all interfaces are instance types"); 1305 // The compiler intrinsic for isInterface tests the 1306 // Klass::_access_flags bits in the same way. 1307 return result; 1308 JVM_END 1309 1310 1311 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1312 JVMWrapper("JVM_GetClassSigners"); 1313 JvmtiVMObjectAllocEventCollector oam; 1314 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1315 // There are no signers for primitive types 1316 return NULL; 1317 } 1318 1319 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1320 1321 // If there are no signers set in the class, or if the class 1322 // is an array, return NULL. 1323 if (signers == NULL) return NULL; 1324 1325 // copy of the signers array 1326 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1327 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1328 for (int index = 0; index < signers->length(); index++) { 1329 signers_copy->obj_at_put(index, signers->obj_at(index)); 1330 } 1331 1332 // return the copy 1333 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1334 JVM_END 1335 1336 1337 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1338 JVMWrapper("JVM_SetClassSigners"); 1339 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1340 // This call is ignored for primitive types and arrays. 1341 // Signers are only set once, ClassLoader.java, and thus shouldn't 1342 // be called with an array. Only the bootstrap loader creates arrays. 1343 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1344 if (k->oop_is_instance()) { 1345 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1346 } 1347 } 1348 JVM_END 1349 1350 1351 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1352 JVMWrapper("JVM_GetProtectionDomain"); 1353 if (JNIHandles::resolve(cls) == NULL) { 1354 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1355 } 1356 1357 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1358 // Primitive types does not have a protection domain. 1359 return NULL; 1360 } 1361 1362 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1363 return (jobject) JNIHandles::make_local(env, pd); 1364 JVM_END 1365 1366 1367 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) { 1368 // If there is a security manager and protection domain, check the access 1369 // in the protection domain, otherwise it is authorized. 1370 if (java_lang_System::has_security_manager()) { 1371 1372 // For bootstrapping, if pd implies method isn't in the JDK, allow 1373 // this context to revert to older behavior. 1374 // In this case the isAuthorized field in AccessControlContext is also not 1375 // present. 1376 if (Universe::protection_domain_implies_method() == NULL) { 1377 return true; 1378 } 1379 1380 // Whitelist certain access control contexts 1381 if (java_security_AccessControlContext::is_authorized(context)) { 1382 return true; 1383 } 1384 1385 oop prot = klass->protection_domain(); 1386 if (prot != NULL) { 1387 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1388 // in the new wrapper. 1389 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1390 Handle h_prot(THREAD, prot); 1391 JavaValue result(T_BOOLEAN); 1392 JavaCallArguments args(h_prot); 1393 JavaCalls::call(&result, m, &args, CHECK_false); 1394 return (result.get_jboolean() != 0); 1395 } 1396 } 1397 return true; 1398 } 1399 1400 // Create an AccessControlContext with a protection domain with null codesource 1401 // and null permissions - which gives no permissions. 1402 oop create_dummy_access_control_context(TRAPS) { 1403 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass()); 1404 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1405 // Call constructor ProtectionDomain(null, null); 1406 JavaValue result(T_VOID); 1407 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass), 1408 vmSymbols::object_initializer_name(), 1409 vmSymbols::codesource_permissioncollection_signature(), 1410 Handle(), Handle(), CHECK_NULL); 1411 1412 // new ProtectionDomain[] {pd}; 1413 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1414 context->obj_at_put(0, obj()); 1415 1416 // new AccessControlContext(new ProtectionDomain[] {pd}) 1417 objArrayHandle h_context(THREAD, context); 1418 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1419 return acc; 1420 } 1421 1422 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1423 JVMWrapper("JVM_DoPrivileged"); 1424 1425 if (action == NULL) { 1426 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1427 } 1428 1429 // Compute the frame initiating the do privileged operation and setup the privileged stack 1430 vframeStream vfst(thread); 1431 vfst.security_get_caller_frame(1); 1432 1433 if (vfst.at_end()) { 1434 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1435 } 1436 1437 Method* method = vfst.method(); 1438 instanceKlassHandle klass (THREAD, method->method_holder()); 1439 1440 // Check that action object understands "Object run()" 1441 Handle h_context; 1442 if (context != NULL) { 1443 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1444 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1445 if (!authorized) { 1446 // Create an unprivileged access control object and call it's run function 1447 // instead. 1448 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1449 h_context = Handle(THREAD, noprivs); 1450 } 1451 } 1452 1453 // Check that action object understands "Object run()" 1454 Handle object (THREAD, JNIHandles::resolve(action)); 1455 1456 // get run() method 1457 Method* m_oop = object->klass()->uncached_lookup_method( 1458 vmSymbols::run_method_name(), 1459 vmSymbols::void_object_signature(), 1460 Klass::find_overpass); 1461 methodHandle m (THREAD, m_oop); 1462 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { 1463 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1464 } 1465 1466 // Stack allocated list of privileged stack elements 1467 PrivilegedElement pi; 1468 if (!vfst.at_end()) { 1469 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1470 thread->set_privileged_stack_top(&pi); 1471 } 1472 1473 1474 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1475 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1476 Handle pending_exception; 1477 JavaValue result(T_OBJECT); 1478 JavaCallArguments args(object); 1479 JavaCalls::call(&result, m, &args, THREAD); 1480 1481 // done with action, remove ourselves from the list 1482 if (!vfst.at_end()) { 1483 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1484 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1485 } 1486 1487 if (HAS_PENDING_EXCEPTION) { 1488 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1489 CLEAR_PENDING_EXCEPTION; 1490 // JVMTI has already reported the pending exception 1491 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1492 if (THREAD->is_Java_thread()) { 1493 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1494 } 1495 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1496 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1497 // Throw a java.security.PrivilegedActionException(Exception e) exception 1498 JavaCallArguments args(pending_exception); 1499 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1500 vmSymbols::exception_void_signature(), 1501 &args); 1502 } 1503 } 1504 1505 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1506 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1507 JVM_END 1508 1509 1510 // Returns the inherited_access_control_context field of the running thread. 1511 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1512 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1513 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1514 return JNIHandles::make_local(env, result); 1515 JVM_END 1516 1517 class RegisterArrayForGC { 1518 private: 1519 JavaThread *_thread; 1520 public: 1521 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1522 _thread = thread; 1523 _thread->register_array_for_gc(array); 1524 } 1525 1526 ~RegisterArrayForGC() { 1527 _thread->register_array_for_gc(NULL); 1528 } 1529 }; 1530 1531 1532 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1533 JVMWrapper("JVM_GetStackAccessControlContext"); 1534 if (!UsePrivilegedStack) return NULL; 1535 1536 ResourceMark rm(THREAD); 1537 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1538 JvmtiVMObjectAllocEventCollector oam; 1539 1540 // count the protection domains on the execution stack. We collapse 1541 // duplicate consecutive protection domains into a single one, as 1542 // well as stopping when we hit a privileged frame. 1543 1544 // Use vframeStream to iterate through Java frames 1545 vframeStream vfst(thread); 1546 1547 oop previous_protection_domain = NULL; 1548 Handle privileged_context(thread, NULL); 1549 bool is_privileged = false; 1550 oop protection_domain = NULL; 1551 1552 for(; !vfst.at_end(); vfst.next()) { 1553 // get method of frame 1554 Method* method = vfst.method(); 1555 intptr_t* frame_id = vfst.frame_id(); 1556 1557 // check the privileged frames to see if we have a match 1558 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1559 // this frame is privileged 1560 is_privileged = true; 1561 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1562 protection_domain = thread->privileged_stack_top()->protection_domain(); 1563 } else { 1564 protection_domain = method->method_holder()->protection_domain(); 1565 } 1566 1567 if ((previous_protection_domain != protection_domain) && protection_domain != NULL) { 1568 local_array->push(protection_domain); 1569 previous_protection_domain = protection_domain; 1570 } 1571 1572 if (is_privileged) break; 1573 } 1574 1575 1576 // either all the domains on the stack were system domains, or 1577 // we had a privileged system domain 1578 if (local_array->is_empty()) { 1579 if (is_privileged && privileged_context.is_null()) return NULL; 1580 1581 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1582 return JNIHandles::make_local(env, result); 1583 } 1584 1585 // the resource area must be registered in case of a gc 1586 RegisterArrayForGC ragc(thread, local_array); 1587 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1588 local_array->length(), CHECK_NULL); 1589 objArrayHandle h_context(thread, context); 1590 for (int index = 0; index < local_array->length(); index++) { 1591 h_context->obj_at_put(index, local_array->at(index)); 1592 } 1593 1594 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1595 1596 return JNIHandles::make_local(env, result); 1597 JVM_END 1598 1599 1600 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1601 JVMWrapper("JVM_IsArrayClass"); 1602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1603 return (k != NULL) && k->oop_is_array() ? true : false; 1604 JVM_END 1605 1606 1607 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1608 JVMWrapper("JVM_IsPrimitiveClass"); 1609 oop mirror = JNIHandles::resolve_non_null(cls); 1610 return (jboolean) java_lang_Class::is_primitive(mirror); 1611 JVM_END 1612 1613 1614 JVM_ENTRY(jclass, JVM_GetComponentType(JNIEnv *env, jclass cls)) 1615 JVMWrapper("JVM_GetComponentType"); 1616 oop mirror = JNIHandles::resolve_non_null(cls); 1617 oop result = Reflection::array_component_type(mirror, CHECK_NULL); 1618 return (jclass) JNIHandles::make_local(env, result); 1619 JVM_END 1620 1621 1622 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1623 JVMWrapper("JVM_GetClassModifiers"); 1624 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1625 // Primitive type 1626 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1627 } 1628 1629 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1630 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1631 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1632 return k->modifier_flags(); 1633 JVM_END 1634 1635 1636 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1637 1638 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1639 JvmtiVMObjectAllocEventCollector oam; 1640 // ofClass is a reference to a java_lang_Class object. The mirror object 1641 // of an InstanceKlass 1642 1643 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1644 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1645 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1646 return (jobjectArray)JNIHandles::make_local(env, result); 1647 } 1648 1649 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1650 InnerClassesIterator iter(k); 1651 1652 if (iter.length() == 0) { 1653 // Neither an inner nor outer class 1654 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1655 return (jobjectArray)JNIHandles::make_local(env, result); 1656 } 1657 1658 // find inner class info 1659 constantPoolHandle cp(thread, k->constants()); 1660 int length = iter.length(); 1661 1662 // Allocate temp. result array 1663 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1664 objArrayHandle result (THREAD, r); 1665 int members = 0; 1666 1667 for (; !iter.done(); iter.next()) { 1668 int ioff = iter.inner_class_info_index(); 1669 int ooff = iter.outer_class_info_index(); 1670 1671 if (ioff != 0 && ooff != 0) { 1672 // Check to see if the name matches the class we're looking for 1673 // before attempting to find the class. 1674 if (cp->klass_name_at_matches(k, ooff)) { 1675 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1676 if (outer_klass == k()) { 1677 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1678 instanceKlassHandle inner_klass (THREAD, ik); 1679 1680 // Throws an exception if outer klass has not declared k as 1681 // an inner klass 1682 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1683 1684 result->obj_at_put(members, inner_klass->java_mirror()); 1685 members++; 1686 } 1687 } 1688 } 1689 } 1690 1691 if (members != length) { 1692 // Return array of right length 1693 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1694 for(int i = 0; i < members; i++) { 1695 res->obj_at_put(i, result->obj_at(i)); 1696 } 1697 return (jobjectArray)JNIHandles::make_local(env, res); 1698 } 1699 1700 return (jobjectArray)JNIHandles::make_local(env, result()); 1701 JVM_END 1702 1703 1704 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1705 { 1706 // ofClass is a reference to a java_lang_Class object. 1707 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1708 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1709 return NULL; 1710 } 1711 1712 bool inner_is_member = false; 1713 Klass* outer_klass 1714 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1715 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1716 if (outer_klass == NULL) return NULL; // already a top-level class 1717 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1718 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1719 } 1720 JVM_END 1721 1722 // should be in InstanceKlass.cpp, but is here for historical reasons 1723 Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle k, 1724 bool* inner_is_member, 1725 TRAPS) { 1726 Thread* thread = THREAD; 1727 InnerClassesIterator iter(k); 1728 if (iter.length() == 0) { 1729 // No inner class info => no declaring class 1730 return NULL; 1731 } 1732 1733 constantPoolHandle i_cp(thread, k->constants()); 1734 1735 bool found = false; 1736 Klass* ok; 1737 instanceKlassHandle outer_klass; 1738 *inner_is_member = false; 1739 1740 // Find inner_klass attribute 1741 for (; !iter.done() && !found; iter.next()) { 1742 int ioff = iter.inner_class_info_index(); 1743 int ooff = iter.outer_class_info_index(); 1744 int noff = iter.inner_name_index(); 1745 if (ioff != 0) { 1746 // Check to see if the name matches the class we're looking for 1747 // before attempting to find the class. 1748 if (i_cp->klass_name_at_matches(k, ioff)) { 1749 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_NULL); 1750 found = (k() == inner_klass); 1751 if (found && ooff != 0) { 1752 ok = i_cp->klass_at(ooff, CHECK_NULL); 1753 outer_klass = instanceKlassHandle(thread, ok); 1754 *inner_is_member = true; 1755 } 1756 } 1757 } 1758 } 1759 1760 if (found && outer_klass.is_null()) { 1761 // It may be anonymous; try for that. 1762 int encl_method_class_idx = k->enclosing_method_class_index(); 1763 if (encl_method_class_idx != 0) { 1764 ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL); 1765 outer_klass = instanceKlassHandle(thread, ok); 1766 *inner_is_member = false; 1767 } 1768 } 1769 1770 // If no inner class attribute found for this class. 1771 if (outer_klass.is_null()) return NULL; 1772 1773 // Throws an exception if outer klass has not declared k as an inner klass 1774 // We need evidence that each klass knows about the other, or else 1775 // the system could allow a spoof of an inner class to gain access rights. 1776 Reflection::check_for_inner_class(outer_klass, k, *inner_is_member, CHECK_NULL); 1777 return outer_klass(); 1778 } 1779 1780 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1781 assert (cls != NULL, "illegal class"); 1782 JVMWrapper("JVM_GetClassSignature"); 1783 JvmtiVMObjectAllocEventCollector oam; 1784 ResourceMark rm(THREAD); 1785 // Return null for arrays and primatives 1786 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1787 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1788 if (k->oop_is_instance()) { 1789 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1790 if (sym == NULL) return NULL; 1791 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1792 return (jstring) JNIHandles::make_local(env, str()); 1793 } 1794 } 1795 return NULL; 1796 JVM_END 1797 1798 1799 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1800 assert (cls != NULL, "illegal class"); 1801 JVMWrapper("JVM_GetClassAnnotations"); 1802 1803 // Return null for arrays and primitives 1804 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1805 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1806 if (k->oop_is_instance()) { 1807 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1808 return (jbyteArray) JNIHandles::make_local(env, a); 1809 } 1810 } 1811 return NULL; 1812 JVM_END 1813 1814 1815 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1816 // some of this code was adapted from from jni_FromReflectedField 1817 1818 oop reflected = JNIHandles::resolve_non_null(field); 1819 oop mirror = java_lang_reflect_Field::clazz(reflected); 1820 Klass* k = java_lang_Class::as_Klass(mirror); 1821 int slot = java_lang_reflect_Field::slot(reflected); 1822 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1823 1824 KlassHandle kh(THREAD, k); 1825 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot); 1826 1827 if (modifiers & JVM_ACC_STATIC) { 1828 // for static fields we only look in the current class 1829 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) { 1830 assert(false, "cannot find static field"); 1831 return false; 1832 } 1833 } else { 1834 // for instance fields we start with the current class and work 1835 // our way up through the superclass chain 1836 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) { 1837 assert(false, "cannot find instance field"); 1838 return false; 1839 } 1840 } 1841 return true; 1842 } 1843 1844 JVM_ENTRY(jbyteArray, JVM_GetFieldAnnotations(JNIEnv *env, jobject field)) 1845 // field is a handle to a java.lang.reflect.Field object 1846 assert(field != NULL, "illegal field"); 1847 JVMWrapper("JVM_GetFieldAnnotations"); 1848 1849 fieldDescriptor fd; 1850 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1851 if (!gotFd) { 1852 return NULL; 1853 } 1854 1855 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.annotations(), THREAD)); 1856 JVM_END 1857 1858 1859 static Method* jvm_get_method_common(jobject method) { 1860 // some of this code was adapted from from jni_FromReflectedMethod 1861 1862 oop reflected = JNIHandles::resolve_non_null(method); 1863 oop mirror = NULL; 1864 int slot = 0; 1865 1866 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1867 mirror = java_lang_reflect_Constructor::clazz(reflected); 1868 slot = java_lang_reflect_Constructor::slot(reflected); 1869 } else { 1870 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1871 "wrong type"); 1872 mirror = java_lang_reflect_Method::clazz(reflected); 1873 slot = java_lang_reflect_Method::slot(reflected); 1874 } 1875 Klass* k = java_lang_Class::as_Klass(mirror); 1876 1877 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1878 assert(m != NULL, "cannot find method"); 1879 return m; // caller has to deal with NULL in product mode 1880 } 1881 1882 1883 JVM_ENTRY(jbyteArray, JVM_GetMethodAnnotations(JNIEnv *env, jobject method)) 1884 JVMWrapper("JVM_GetMethodAnnotations"); 1885 1886 // method is a handle to a java.lang.reflect.Method object 1887 Method* m = jvm_get_method_common(method); 1888 if (m == NULL) { 1889 return NULL; 1890 } 1891 1892 return (jbyteArray) JNIHandles::make_local(env, 1893 Annotations::make_java_array(m->annotations(), THREAD)); 1894 JVM_END 1895 1896 1897 JVM_ENTRY(jbyteArray, JVM_GetMethodDefaultAnnotationValue(JNIEnv *env, jobject method)) 1898 JVMWrapper("JVM_GetMethodDefaultAnnotationValue"); 1899 1900 // method is a handle to a java.lang.reflect.Method object 1901 Method* m = jvm_get_method_common(method); 1902 if (m == NULL) { 1903 return NULL; 1904 } 1905 1906 return (jbyteArray) JNIHandles::make_local(env, 1907 Annotations::make_java_array(m->annotation_default(), THREAD)); 1908 JVM_END 1909 1910 1911 JVM_ENTRY(jbyteArray, JVM_GetMethodParameterAnnotations(JNIEnv *env, jobject method)) 1912 JVMWrapper("JVM_GetMethodParameterAnnotations"); 1913 1914 // method is a handle to a java.lang.reflect.Method object 1915 Method* m = jvm_get_method_common(method); 1916 if (m == NULL) { 1917 return NULL; 1918 } 1919 1920 return (jbyteArray) JNIHandles::make_local(env, 1921 Annotations::make_java_array(m->parameter_annotations(), THREAD)); 1922 JVM_END 1923 1924 /* Type use annotations support (JDK 1.8) */ 1925 1926 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1927 assert (cls != NULL, "illegal class"); 1928 JVMWrapper("JVM_GetClassTypeAnnotations"); 1929 ResourceMark rm(THREAD); 1930 // Return null for arrays and primitives 1931 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1932 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1933 if (k->oop_is_instance()) { 1934 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1935 if (type_annotations != NULL) { 1936 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1937 return (jbyteArray) JNIHandles::make_local(env, a); 1938 } 1939 } 1940 } 1941 return NULL; 1942 JVM_END 1943 1944 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1945 assert (method != NULL, "illegal method"); 1946 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1947 1948 // method is a handle to a java.lang.reflect.Method object 1949 Method* m = jvm_get_method_common(method); 1950 if (m == NULL) { 1951 return NULL; 1952 } 1953 1954 AnnotationArray* type_annotations = m->type_annotations(); 1955 if (type_annotations != NULL) { 1956 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1957 return (jbyteArray) JNIHandles::make_local(env, a); 1958 } 1959 1960 return NULL; 1961 JVM_END 1962 1963 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1964 assert (field != NULL, "illegal field"); 1965 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1966 1967 fieldDescriptor fd; 1968 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1969 if (!gotFd) { 1970 return NULL; 1971 } 1972 1973 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1974 JVM_END 1975 1976 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { 1977 if (!cp->is_within_bounds(index)) { 1978 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1979 } 1980 } 1981 1982 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1983 { 1984 JVMWrapper("JVM_GetMethodParameters"); 1985 // method is a handle to a java.lang.reflect.Method object 1986 Method* method_ptr = jvm_get_method_common(method); 1987 methodHandle mh (THREAD, method_ptr); 1988 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1989 const int num_params = mh->method_parameters_length(); 1990 1991 if (0 != num_params) { 1992 // make sure all the symbols are properly formatted 1993 for (int i = 0; i < num_params; i++) { 1994 MethodParametersElement* params = mh->method_parameters_start(); 1995 int index = params[i].name_cp_index; 1996 bounds_check(mh->constants(), index, CHECK_NULL); 1997 1998 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1999 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 2000 "Wrong type at constant pool index"); 2001 } 2002 2003 } 2004 2005 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 2006 objArrayHandle result (THREAD, result_oop); 2007 2008 for (int i = 0; i < num_params; i++) { 2009 MethodParametersElement* params = mh->method_parameters_start(); 2010 // For a 0 index, give a NULL symbol 2011 Symbol* sym = 0 != params[i].name_cp_index ? 2012 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 2013 int flags = params[i].flags; 2014 oop param = Reflection::new_parameter(reflected_method, i, sym, 2015 flags, CHECK_NULL); 2016 result->obj_at_put(i, param); 2017 } 2018 return (jobjectArray)JNIHandles::make_local(env, result()); 2019 } else { 2020 return (jobjectArray)NULL; 2021 } 2022 } 2023 JVM_END 2024 2025 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 2026 2027 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 2028 { 2029 JVMWrapper("JVM_GetClassDeclaredFields"); 2030 JvmtiVMObjectAllocEventCollector oam; 2031 2032 // Exclude primitive types and array types 2033 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 2034 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 2035 // Return empty array 2036 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 2037 return (jobjectArray) JNIHandles::make_local(env, res); 2038 } 2039 2040 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 2041 constantPoolHandle cp(THREAD, k->constants()); 2042 2043 // Ensure class is linked 2044 k->link_class(CHECK_NULL); 2045 2046 // 4496456 We need to filter out java.lang.Throwable.backtrace 2047 bool skip_backtrace = false; 2048 2049 // Allocate result 2050 int num_fields; 2051 2052 if (publicOnly) { 2053 num_fields = 0; 2054 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) { 2055 if (fs.access_flags().is_public()) ++num_fields; 2056 } 2057 } else { 2058 num_fields = k->java_fields_count(); 2059 2060 if (k() == SystemDictionary::Throwable_klass()) { 2061 num_fields--; 2062 skip_backtrace = true; 2063 } 2064 } 2065 2066 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 2067 objArrayHandle result (THREAD, r); 2068 2069 int out_idx = 0; 2070 fieldDescriptor fd; 2071 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 2072 if (skip_backtrace) { 2073 // 4496456 skip java.lang.Throwable.backtrace 2074 int offset = fs.offset(); 2075 if (offset == java_lang_Throwable::get_backtrace_offset()) continue; 2076 } 2077 2078 if (!publicOnly || fs.access_flags().is_public()) { 2079 fd.reinitialize(k(), fs.index()); 2080 oop field = Reflection::new_field(&fd, UseNewReflection, CHECK_NULL); 2081 result->obj_at_put(out_idx, field); 2082 ++out_idx; 2083 } 2084 } 2085 assert(out_idx == num_fields, "just checking"); 2086 return (jobjectArray) JNIHandles::make_local(env, result()); 2087 } 2088 JVM_END 2089 2090 static bool select_method(methodHandle method, bool want_constructor) { 2091 if (want_constructor) { 2092 return (method->is_initializer() && !method->is_static()); 2093 } else { 2094 return (!method->is_initializer() && !method->is_overpass()); 2095 } 2096 } 2097 2098 static jobjectArray get_class_declared_methods_helper( 2099 JNIEnv *env, 2100 jclass ofClass, jboolean publicOnly, 2101 bool want_constructor, 2102 Klass* klass, TRAPS) { 2103 2104 JvmtiVMObjectAllocEventCollector oam; 2105 2106 // Exclude primitive types and array types 2107 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 2108 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 2109 // Return empty array 2110 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 2111 return (jobjectArray) JNIHandles::make_local(env, res); 2112 } 2113 2114 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 2115 2116 // Ensure class is linked 2117 k->link_class(CHECK_NULL); 2118 2119 Array<Method*>* methods = k->methods(); 2120 int methods_length = methods->length(); 2121 2122 // Save original method_idnum in case of redefinition, which can change 2123 // the idnum of obsolete methods. The new method will have the same idnum 2124 // but if we refresh the methods array, the counts will be wrong. 2125 ResourceMark rm(THREAD); 2126 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 2127 int num_methods = 0; 2128 2129 for (int i = 0; i < methods_length; i++) { 2130 methodHandle method(THREAD, methods->at(i)); 2131 if (select_method(method, want_constructor)) { 2132 if (!publicOnly || method->is_public()) { 2133 idnums->push(method->method_idnum()); 2134 ++num_methods; 2135 } 2136 } 2137 } 2138 2139 // Allocate result 2140 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 2141 objArrayHandle result (THREAD, r); 2142 2143 // Now just put the methods that we selected above, but go by their idnum 2144 // in case of redefinition. The methods can be redefined at any safepoint, 2145 // so above when allocating the oop array and below when creating reflect 2146 // objects. 2147 for (int i = 0; i < num_methods; i++) { 2148 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 2149 if (method.is_null()) { 2150 // Method may have been deleted and seems this API can handle null 2151 // Otherwise should probably put a method that throws NSME 2152 result->obj_at_put(i, NULL); 2153 } else { 2154 oop m; 2155 if (want_constructor) { 2156 m = Reflection::new_constructor(method, CHECK_NULL); 2157 } else { 2158 m = Reflection::new_method(method, UseNewReflection, false, CHECK_NULL); 2159 } 2160 result->obj_at_put(i, m); 2161 } 2162 } 2163 2164 return (jobjectArray) JNIHandles::make_local(env, result()); 2165 } 2166 2167 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 2168 { 2169 JVMWrapper("JVM_GetClassDeclaredMethods"); 2170 return get_class_declared_methods_helper(env, ofClass, publicOnly, 2171 /*want_constructor*/ false, 2172 SystemDictionary::reflect_Method_klass(), THREAD); 2173 } 2174 JVM_END 2175 2176 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 2177 { 2178 JVMWrapper("JVM_GetClassDeclaredConstructors"); 2179 return get_class_declared_methods_helper(env, ofClass, publicOnly, 2180 /*want_constructor*/ true, 2181 SystemDictionary::reflect_Constructor_klass(), THREAD); 2182 } 2183 JVM_END 2184 2185 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 2186 { 2187 JVMWrapper("JVM_GetClassAccessFlags"); 2188 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 2189 // Primitive type 2190 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 2191 } 2192 2193 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2194 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 2195 } 2196 JVM_END 2197 2198 2199 // Constant pool access ////////////////////////////////////////////////////////// 2200 2201 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2202 { 2203 JVMWrapper("JVM_GetClassConstantPool"); 2204 JvmtiVMObjectAllocEventCollector oam; 2205 2206 // Return null for primitives and arrays 2207 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 2208 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2209 if (k->oop_is_instance()) { 2210 instanceKlassHandle k_h(THREAD, k); 2211 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL); 2212 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2213 return JNIHandles::make_local(jcp()); 2214 } 2215 } 2216 return NULL; 2217 } 2218 JVM_END 2219 2220 2221 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2222 { 2223 JVMWrapper("JVM_ConstantPoolGetSize"); 2224 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2225 return cp->length(); 2226 } 2227 JVM_END 2228 2229 2230 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2231 { 2232 JVMWrapper("JVM_ConstantPoolGetClassAt"); 2233 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2234 bounds_check(cp, index, CHECK_NULL); 2235 constantTag tag = cp->tag_at(index); 2236 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2237 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2238 } 2239 Klass* k = cp->klass_at(index, CHECK_NULL); 2240 return (jclass) JNIHandles::make_local(k->java_mirror()); 2241 } 2242 JVM_END 2243 2244 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2245 { 2246 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 2247 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2248 bounds_check(cp, index, CHECK_NULL); 2249 constantTag tag = cp->tag_at(index); 2250 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2251 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2252 } 2253 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2254 if (k == NULL) return NULL; 2255 return (jclass) JNIHandles::make_local(k->java_mirror()); 2256 } 2257 JVM_END 2258 2259 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2260 constantTag tag = cp->tag_at(index); 2261 if (!tag.is_method() && !tag.is_interface_method()) { 2262 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2263 } 2264 int klass_ref = cp->uncached_klass_ref_index_at(index); 2265 Klass* k_o; 2266 if (force_resolution) { 2267 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2268 } else { 2269 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2270 if (k_o == NULL) return NULL; 2271 } 2272 instanceKlassHandle k(THREAD, k_o); 2273 Symbol* name = cp->uncached_name_ref_at(index); 2274 Symbol* sig = cp->uncached_signature_ref_at(index); 2275 methodHandle m (THREAD, k->find_method(name, sig)); 2276 if (m.is_null()) { 2277 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2278 } 2279 oop method; 2280 if (!m->is_initializer() || m->is_static()) { 2281 method = Reflection::new_method(m, true, true, CHECK_NULL); 2282 } else { 2283 method = Reflection::new_constructor(m, CHECK_NULL); 2284 } 2285 return JNIHandles::make_local(method); 2286 } 2287 2288 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2289 { 2290 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 2291 JvmtiVMObjectAllocEventCollector oam; 2292 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2293 bounds_check(cp, index, CHECK_NULL); 2294 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2295 return res; 2296 } 2297 JVM_END 2298 2299 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2300 { 2301 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2302 JvmtiVMObjectAllocEventCollector oam; 2303 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2304 bounds_check(cp, index, CHECK_NULL); 2305 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2306 return res; 2307 } 2308 JVM_END 2309 2310 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2311 constantTag tag = cp->tag_at(index); 2312 if (!tag.is_field()) { 2313 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2314 } 2315 int klass_ref = cp->uncached_klass_ref_index_at(index); 2316 Klass* k_o; 2317 if (force_resolution) { 2318 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2319 } else { 2320 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2321 if (k_o == NULL) return NULL; 2322 } 2323 instanceKlassHandle k(THREAD, k_o); 2324 Symbol* name = cp->uncached_name_ref_at(index); 2325 Symbol* sig = cp->uncached_signature_ref_at(index); 2326 fieldDescriptor fd; 2327 Klass* target_klass = k->find_field(name, sig, &fd); 2328 if (target_klass == NULL) { 2329 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2330 } 2331 oop field = Reflection::new_field(&fd, true, CHECK_NULL); 2332 return JNIHandles::make_local(field); 2333 } 2334 2335 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2336 { 2337 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2338 JvmtiVMObjectAllocEventCollector oam; 2339 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2340 bounds_check(cp, index, CHECK_NULL); 2341 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2342 return res; 2343 } 2344 JVM_END 2345 2346 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2347 { 2348 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2349 JvmtiVMObjectAllocEventCollector oam; 2350 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2351 bounds_check(cp, index, CHECK_NULL); 2352 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2353 return res; 2354 } 2355 JVM_END 2356 2357 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2358 { 2359 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2360 JvmtiVMObjectAllocEventCollector oam; 2361 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2362 bounds_check(cp, index, CHECK_NULL); 2363 constantTag tag = cp->tag_at(index); 2364 if (!tag.is_field_or_method()) { 2365 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2366 } 2367 int klass_ref = cp->uncached_klass_ref_index_at(index); 2368 Symbol* klass_name = cp->klass_name_at(klass_ref); 2369 Symbol* member_name = cp->uncached_name_ref_at(index); 2370 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2371 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2372 objArrayHandle dest(THREAD, dest_o); 2373 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2374 dest->obj_at_put(0, str()); 2375 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2376 dest->obj_at_put(1, str()); 2377 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2378 dest->obj_at_put(2, str()); 2379 return (jobjectArray) JNIHandles::make_local(dest()); 2380 } 2381 JVM_END 2382 2383 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2384 { 2385 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2386 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2387 bounds_check(cp, index, CHECK_0); 2388 constantTag tag = cp->tag_at(index); 2389 if (!tag.is_int()) { 2390 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2391 } 2392 return cp->int_at(index); 2393 } 2394 JVM_END 2395 2396 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2397 { 2398 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2399 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2400 bounds_check(cp, index, CHECK_(0L)); 2401 constantTag tag = cp->tag_at(index); 2402 if (!tag.is_long()) { 2403 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2404 } 2405 return cp->long_at(index); 2406 } 2407 JVM_END 2408 2409 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2410 { 2411 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2412 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2413 bounds_check(cp, index, CHECK_(0.0f)); 2414 constantTag tag = cp->tag_at(index); 2415 if (!tag.is_float()) { 2416 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2417 } 2418 return cp->float_at(index); 2419 } 2420 JVM_END 2421 2422 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2423 { 2424 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2425 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2426 bounds_check(cp, index, CHECK_(0.0)); 2427 constantTag tag = cp->tag_at(index); 2428 if (!tag.is_double()) { 2429 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2430 } 2431 return cp->double_at(index); 2432 } 2433 JVM_END 2434 2435 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2436 { 2437 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2438 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2439 bounds_check(cp, index, CHECK_NULL); 2440 constantTag tag = cp->tag_at(index); 2441 if (!tag.is_string()) { 2442 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2443 } 2444 oop str = cp->string_at(index, CHECK_NULL); 2445 return (jstring) JNIHandles::make_local(str); 2446 } 2447 JVM_END 2448 2449 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2450 { 2451 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2452 JvmtiVMObjectAllocEventCollector oam; 2453 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2454 bounds_check(cp, index, CHECK_NULL); 2455 constantTag tag = cp->tag_at(index); 2456 if (!tag.is_symbol()) { 2457 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2458 } 2459 Symbol* sym = cp->symbol_at(index); 2460 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2461 return (jstring) JNIHandles::make_local(str()); 2462 } 2463 JVM_END 2464 2465 2466 // Assertion support. ////////////////////////////////////////////////////////// 2467 2468 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2469 JVMWrapper("JVM_DesiredAssertionStatus"); 2470 assert(cls != NULL, "bad class"); 2471 2472 oop r = JNIHandles::resolve(cls); 2473 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2474 if (java_lang_Class::is_primitive(r)) return false; 2475 2476 Klass* k = java_lang_Class::as_Klass(r); 2477 assert(k->oop_is_instance(), "must be an instance klass"); 2478 if (! k->oop_is_instance()) return false; 2479 2480 ResourceMark rm(THREAD); 2481 const char* name = k->name()->as_C_string(); 2482 bool system_class = k->class_loader() == NULL; 2483 return JavaAssertions::enabled(name, system_class); 2484 2485 JVM_END 2486 2487 2488 // Return a new AssertionStatusDirectives object with the fields filled in with 2489 // command-line assertion arguments (i.e., -ea, -da). 2490 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2491 JVMWrapper("JVM_AssertionStatusDirectives"); 2492 JvmtiVMObjectAllocEventCollector oam; 2493 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2494 return JNIHandles::make_local(env, asd); 2495 JVM_END 2496 2497 // Verification //////////////////////////////////////////////////////////////////////////////// 2498 2499 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2500 2501 // RedefineClasses support: bug 6214132 caused verification to fail. 2502 // All functions from this section should call the jvmtiThreadSate function: 2503 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2504 // The function returns a Klass* of the _scratch_class if the verifier 2505 // was invoked in the middle of the class redefinition. 2506 // Otherwise it returns its argument value which is the _the_class Klass*. 2507 // Please, refer to the description in the jvmtiThreadSate.hpp. 2508 2509 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2510 JVMWrapper("JVM_GetClassNameUTF"); 2511 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2512 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2513 return k->name()->as_utf8(); 2514 JVM_END 2515 2516 2517 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2518 JVMWrapper("JVM_GetClassCPTypes"); 2519 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2520 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2521 // types will have length zero if this is not an InstanceKlass 2522 // (length is determined by call to JVM_GetClassCPEntriesCount) 2523 if (k->oop_is_instance()) { 2524 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2525 for (int index = cp->length() - 1; index >= 0; index--) { 2526 constantTag tag = cp->tag_at(index); 2527 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2528 } 2529 } 2530 JVM_END 2531 2532 2533 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2534 JVMWrapper("JVM_GetClassCPEntriesCount"); 2535 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2536 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2537 if (!k->oop_is_instance()) 2538 return 0; 2539 return InstanceKlass::cast(k)->constants()->length(); 2540 JVM_END 2541 2542 2543 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2544 JVMWrapper("JVM_GetClassFieldsCount"); 2545 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2546 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2547 if (!k->oop_is_instance()) 2548 return 0; 2549 return InstanceKlass::cast(k)->java_fields_count(); 2550 JVM_END 2551 2552 2553 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2554 JVMWrapper("JVM_GetClassMethodsCount"); 2555 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2556 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2557 if (!k->oop_is_instance()) 2558 return 0; 2559 return InstanceKlass::cast(k)->methods()->length(); 2560 JVM_END 2561 2562 2563 // The following methods, used for the verifier, are never called with 2564 // array klasses, so a direct cast to InstanceKlass is safe. 2565 // Typically, these methods are called in a loop with bounds determined 2566 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2567 // zero for arrays. 2568 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2569 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2570 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2571 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2572 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2573 int length = method->checked_exceptions_length(); 2574 if (length > 0) { 2575 CheckedExceptionElement* table= method->checked_exceptions_start(); 2576 for (int i = 0; i < length; i++) { 2577 exceptions[i] = table[i].class_cp_index; 2578 } 2579 } 2580 JVM_END 2581 2582 2583 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2584 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2585 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2586 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2587 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2588 return method->checked_exceptions_length(); 2589 JVM_END 2590 2591 2592 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2593 JVMWrapper("JVM_GetMethodIxByteCode"); 2594 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2595 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2596 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2597 memcpy(code, method->code_base(), method->code_size()); 2598 JVM_END 2599 2600 2601 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2602 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2603 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2604 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2605 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2606 return method->code_size(); 2607 JVM_END 2608 2609 2610 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2611 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2612 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2613 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2614 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2615 ExceptionTable extable(method); 2616 entry->start_pc = extable.start_pc(entry_index); 2617 entry->end_pc = extable.end_pc(entry_index); 2618 entry->handler_pc = extable.handler_pc(entry_index); 2619 entry->catchType = extable.catch_type_index(entry_index); 2620 JVM_END 2621 2622 2623 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2624 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2625 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2626 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2627 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2628 return method->exception_table_length(); 2629 JVM_END 2630 2631 2632 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2633 JVMWrapper("JVM_GetMethodIxModifiers"); 2634 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2635 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2636 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2637 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2638 JVM_END 2639 2640 2641 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2642 JVMWrapper("JVM_GetFieldIxModifiers"); 2643 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2644 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2645 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2646 JVM_END 2647 2648 2649 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2650 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2651 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2652 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2653 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2654 return method->max_locals(); 2655 JVM_END 2656 2657 2658 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2659 JVMWrapper("JVM_GetMethodIxArgsSize"); 2660 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2661 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2662 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2663 return method->size_of_parameters(); 2664 JVM_END 2665 2666 2667 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2668 JVMWrapper("JVM_GetMethodIxMaxStack"); 2669 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2670 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2671 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2672 return method->verifier_max_stack(); 2673 JVM_END 2674 2675 2676 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2677 JVMWrapper("JVM_IsConstructorIx"); 2678 ResourceMark rm(THREAD); 2679 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2680 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2681 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2682 return method->name() == vmSymbols::object_initializer_name(); 2683 JVM_END 2684 2685 2686 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2687 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2688 ResourceMark rm(THREAD); 2689 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2690 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2691 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2692 return method->is_overpass(); 2693 JVM_END 2694 2695 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2696 JVMWrapper("JVM_GetMethodIxIxUTF"); 2697 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2698 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2699 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2700 return method->name()->as_utf8(); 2701 JVM_END 2702 2703 2704 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2705 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2706 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2707 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2708 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2709 return method->signature()->as_utf8(); 2710 JVM_END 2711 2712 /** 2713 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2714 * read entries in the constant pool. Since the old verifier always 2715 * works on a copy of the code, it will not see any rewriting that 2716 * may possibly occur in the middle of verification. So it is important 2717 * that nothing it calls tries to use the cpCache instead of the raw 2718 * constant pool, so we must use cp->uncached_x methods when appropriate. 2719 */ 2720 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2721 JVMWrapper("JVM_GetCPFieldNameUTF"); 2722 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2723 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2724 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2725 switch (cp->tag_at(cp_index).value()) { 2726 case JVM_CONSTANT_Fieldref: 2727 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2728 default: 2729 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2730 } 2731 ShouldNotReachHere(); 2732 return NULL; 2733 JVM_END 2734 2735 2736 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2737 JVMWrapper("JVM_GetCPMethodNameUTF"); 2738 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2739 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2740 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2741 switch (cp->tag_at(cp_index).value()) { 2742 case JVM_CONSTANT_InterfaceMethodref: 2743 case JVM_CONSTANT_Methodref: 2744 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2745 default: 2746 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2747 } 2748 ShouldNotReachHere(); 2749 return NULL; 2750 JVM_END 2751 2752 2753 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2754 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2755 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2756 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2757 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2758 switch (cp->tag_at(cp_index).value()) { 2759 case JVM_CONSTANT_InterfaceMethodref: 2760 case JVM_CONSTANT_Methodref: 2761 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2762 default: 2763 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2764 } 2765 ShouldNotReachHere(); 2766 return NULL; 2767 JVM_END 2768 2769 2770 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2771 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2772 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2773 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2774 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2775 switch (cp->tag_at(cp_index).value()) { 2776 case JVM_CONSTANT_Fieldref: 2777 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2778 default: 2779 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2780 } 2781 ShouldNotReachHere(); 2782 return NULL; 2783 JVM_END 2784 2785 2786 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2787 JVMWrapper("JVM_GetCPClassNameUTF"); 2788 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2789 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2790 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2791 Symbol* classname = cp->klass_name_at(cp_index); 2792 return classname->as_utf8(); 2793 JVM_END 2794 2795 2796 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2797 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2798 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2799 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2800 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2801 switch (cp->tag_at(cp_index).value()) { 2802 case JVM_CONSTANT_Fieldref: { 2803 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2804 Symbol* classname = cp->klass_name_at(class_index); 2805 return classname->as_utf8(); 2806 } 2807 default: 2808 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2809 } 2810 ShouldNotReachHere(); 2811 return NULL; 2812 JVM_END 2813 2814 2815 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2816 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2817 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2818 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2819 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2820 switch (cp->tag_at(cp_index).value()) { 2821 case JVM_CONSTANT_Methodref: 2822 case JVM_CONSTANT_InterfaceMethodref: { 2823 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2824 Symbol* classname = cp->klass_name_at(class_index); 2825 return classname->as_utf8(); 2826 } 2827 default: 2828 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2829 } 2830 ShouldNotReachHere(); 2831 return NULL; 2832 JVM_END 2833 2834 2835 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2836 JVMWrapper("JVM_GetCPFieldModifiers"); 2837 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2838 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2839 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2840 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2841 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2842 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2843 switch (cp->tag_at(cp_index).value()) { 2844 case JVM_CONSTANT_Fieldref: { 2845 Symbol* name = cp->uncached_name_ref_at(cp_index); 2846 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2847 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) { 2848 if (fs.name() == name && fs.signature() == signature) { 2849 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2850 } 2851 } 2852 return -1; 2853 } 2854 default: 2855 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2856 } 2857 ShouldNotReachHere(); 2858 return 0; 2859 JVM_END 2860 2861 2862 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2863 JVMWrapper("JVM_GetCPMethodModifiers"); 2864 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2865 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2866 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2867 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2868 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2869 switch (cp->tag_at(cp_index).value()) { 2870 case JVM_CONSTANT_Methodref: 2871 case JVM_CONSTANT_InterfaceMethodref: { 2872 Symbol* name = cp->uncached_name_ref_at(cp_index); 2873 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2874 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2875 int methods_count = methods->length(); 2876 for (int i = 0; i < methods_count; i++) { 2877 Method* method = methods->at(i); 2878 if (method->name() == name && method->signature() == signature) { 2879 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2880 } 2881 } 2882 return -1; 2883 } 2884 default: 2885 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2886 } 2887 ShouldNotReachHere(); 2888 return 0; 2889 JVM_END 2890 2891 2892 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2893 2894 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2895 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2896 JVM_END 2897 2898 2899 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2900 JVMWrapper("JVM_IsSameClassPackage"); 2901 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2902 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2903 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2904 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2905 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2906 JVM_END 2907 2908 2909 // IO functions //////////////////////////////////////////////////////////////////////////////////////// 2910 2911 JVM_LEAF(jint, JVM_Open(const char *fname, jint flags, jint mode)) 2912 JVMWrapper2("JVM_Open (%s)", fname); 2913 2914 //%note jvm_r6 2915 int result = os::open(fname, flags, mode); 2916 if (result >= 0) { 2917 return result; 2918 } else { 2919 switch(errno) { 2920 case EEXIST: 2921 return JVM_EEXIST; 2922 default: 2923 return -1; 2924 } 2925 } 2926 JVM_END 2927 2928 2929 JVM_LEAF(jint, JVM_Close(jint fd)) 2930 JVMWrapper2("JVM_Close (0x%x)", fd); 2931 //%note jvm_r6 2932 return os::close(fd); 2933 JVM_END 2934 2935 2936 JVM_LEAF(jint, JVM_Read(jint fd, char *buf, jint nbytes)) 2937 JVMWrapper2("JVM_Read (0x%x)", fd); 2938 2939 //%note jvm_r6 2940 return (jint)os::restartable_read(fd, buf, nbytes); 2941 JVM_END 2942 2943 2944 JVM_LEAF(jint, JVM_Write(jint fd, char *buf, jint nbytes)) 2945 JVMWrapper2("JVM_Write (0x%x)", fd); 2946 2947 //%note jvm_r6 2948 return (jint)os::write(fd, buf, nbytes); 2949 JVM_END 2950 2951 2952 JVM_LEAF(jint, JVM_Available(jint fd, jlong *pbytes)) 2953 JVMWrapper2("JVM_Available (0x%x)", fd); 2954 //%note jvm_r6 2955 return os::available(fd, pbytes); 2956 JVM_END 2957 2958 2959 JVM_LEAF(jlong, JVM_Lseek(jint fd, jlong offset, jint whence)) 2960 JVMWrapper4("JVM_Lseek (0x%x, " INT64_FORMAT ", %d)", fd, (int64_t) offset, whence); 2961 //%note jvm_r6 2962 return os::lseek(fd, offset, whence); 2963 JVM_END 2964 2965 2966 JVM_LEAF(jint, JVM_SetLength(jint fd, jlong length)) 2967 JVMWrapper3("JVM_SetLength (0x%x, " INT64_FORMAT ")", fd, (int64_t) length); 2968 return os::ftruncate(fd, length); 2969 JVM_END 2970 2971 2972 JVM_LEAF(jint, JVM_Sync(jint fd)) 2973 JVMWrapper2("JVM_Sync (0x%x)", fd); 2974 //%note jvm_r6 2975 return os::fsync(fd); 2976 JVM_END 2977 2978 2979 // Printing support ////////////////////////////////////////////////// 2980 extern "C" { 2981 2982 ATTRIBUTE_PRINTF(3, 0) 2983 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2984 // Reject count values that are negative signed values converted to 2985 // unsigned; see bug 4399518, 4417214 2986 if ((intptr_t)count <= 0) return -1; 2987 2988 int result = os::vsnprintf(str, count, fmt, args); 2989 if (result > 0 && (size_t)result >= count) { 2990 result = -1; 2991 } 2992 2993 return result; 2994 } 2995 2996 ATTRIBUTE_PRINTF(3, 0) 2997 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2998 va_list args; 2999 int len; 3000 va_start(args, fmt); 3001 len = jio_vsnprintf(str, count, fmt, args); 3002 va_end(args); 3003 return len; 3004 } 3005 3006 ATTRIBUTE_PRINTF(2,3) 3007 int jio_fprintf(FILE* f, const char *fmt, ...) { 3008 int len; 3009 va_list args; 3010 va_start(args, fmt); 3011 len = jio_vfprintf(f, fmt, args); 3012 va_end(args); 3013 return len; 3014 } 3015 3016 ATTRIBUTE_PRINTF(2, 0) 3017 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 3018 if (Arguments::vfprintf_hook() != NULL) { 3019 return Arguments::vfprintf_hook()(f, fmt, args); 3020 } else { 3021 return vfprintf(f, fmt, args); 3022 } 3023 } 3024 3025 ATTRIBUTE_PRINTF(1, 2) 3026 JNIEXPORT int jio_printf(const char *fmt, ...) { 3027 int len; 3028 va_list args; 3029 va_start(args, fmt); 3030 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 3031 va_end(args); 3032 return len; 3033 } 3034 3035 3036 // HotSpot specific jio method 3037 void jio_print(const char* s) { 3038 // Try to make this function as atomic as possible. 3039 if (Arguments::vfprintf_hook() != NULL) { 3040 jio_fprintf(defaultStream::output_stream(), "%s", s); 3041 } else { 3042 // Make an unused local variable to avoid warning from gcc 4.x compiler. 3043 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 3044 } 3045 } 3046 3047 } // Extern C 3048 3049 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 3050 3051 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 3052 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or 3053 // OSThread objects. The exception to this rule is when the target object is the thread 3054 // doing the operation, in which case we know that the thread won't exit until the 3055 // operation is done (all exits being voluntary). There are a few cases where it is 3056 // rather silly to do operations on yourself, like resuming yourself or asking whether 3057 // you are alive. While these can still happen, they are not subject to deadlocks if 3058 // the lock is held while the operation occurs (this is not the case for suspend, for 3059 // instance), and are very unlikely. Because IsAlive needs to be fast and its 3060 // implementation is local to this file, we always lock Threads_lock for that one. 3061 3062 static void thread_entry(JavaThread* thread, TRAPS) { 3063 HandleMark hm(THREAD); 3064 Handle obj(THREAD, thread->threadObj()); 3065 JavaValue result(T_VOID); 3066 JavaCalls::call_virtual(&result, 3067 obj, 3068 KlassHandle(THREAD, SystemDictionary::Thread_klass()), 3069 vmSymbols::run_method_name(), 3070 vmSymbols::void_method_signature(), 3071 THREAD); 3072 } 3073 3074 3075 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 3076 JVMWrapper("JVM_StartThread"); 3077 JavaThread *native_thread = NULL; 3078 3079 // We cannot hold the Threads_lock when we throw an exception, 3080 // due to rank ordering issues. Example: we might need to grab the 3081 // Heap_lock while we construct the exception. 3082 bool throw_illegal_thread_state = false; 3083 3084 // We must release the Threads_lock before we can post a jvmti event 3085 // in Thread::start. 3086 { 3087 // Ensure that the C++ Thread and OSThread structures aren't freed before 3088 // we operate. 3089 MutexLocker mu(Threads_lock); 3090 3091 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 3092 // re-starting an already started thread, so we should usually find 3093 // that the JavaThread is null. However for a JNI attached thread 3094 // there is a small window between the Thread object being created 3095 // (with its JavaThread set) and the update to its threadStatus, so we 3096 // have to check for this 3097 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 3098 throw_illegal_thread_state = true; 3099 } else { 3100 // We could also check the stillborn flag to see if this thread was already stopped, but 3101 // for historical reasons we let the thread detect that itself when it starts running 3102 3103 jlong size = 3104 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 3105 // Allocate the C++ Thread structure and create the native thread. The 3106 // stack size retrieved from java is signed, but the constructor takes 3107 // size_t (an unsigned type), so avoid passing negative values which would 3108 // result in really large stacks. 3109 size_t sz = size > 0 ? (size_t) size : 0; 3110 native_thread = new JavaThread(&thread_entry, sz); 3111 3112 // At this point it may be possible that no osthread was created for the 3113 // JavaThread due to lack of memory. Check for this situation and throw 3114 // an exception if necessary. Eventually we may want to change this so 3115 // that we only grab the lock if the thread was created successfully - 3116 // then we can also do this check and throw the exception in the 3117 // JavaThread constructor. 3118 if (native_thread->osthread() != NULL) { 3119 // Note: the current thread is not being used within "prepare". 3120 native_thread->prepare(jthread); 3121 } 3122 } 3123 } 3124 3125 if (throw_illegal_thread_state) { 3126 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3127 } 3128 3129 assert(native_thread != NULL, "Starting null thread?"); 3130 3131 if (native_thread->osthread() == NULL) { 3132 // No one should hold a reference to the 'native_thread'. 3133 delete native_thread; 3134 if (JvmtiExport::should_post_resource_exhausted()) { 3135 JvmtiExport::post_resource_exhausted( 3136 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3137 "unable to create new native thread"); 3138 } 3139 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3140 "unable to create new native thread"); 3141 } 3142 3143 Thread::start(native_thread); 3144 3145 JVM_END 3146 3147 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 3148 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 3149 // but is thought to be reliable and simple. In the case, where the receiver is the 3150 // same thread as the sender, no safepoint is needed. 3151 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 3152 JVMWrapper("JVM_StopThread"); 3153 3154 oop java_throwable = JNIHandles::resolve(throwable); 3155 if (java_throwable == NULL) { 3156 THROW(vmSymbols::java_lang_NullPointerException()); 3157 } 3158 oop java_thread = JNIHandles::resolve_non_null(jthread); 3159 JavaThread* receiver = java_lang_Thread::thread(java_thread); 3160 Events::log_exception(JavaThread::current(), 3161 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 3162 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 3163 // First check if thread is alive 3164 if (receiver != NULL) { 3165 // Check if exception is getting thrown at self (use oop equality, since the 3166 // target object might exit) 3167 if (java_thread == thread->threadObj()) { 3168 THROW_OOP(java_throwable); 3169 } else { 3170 // Enques a VM_Operation to stop all threads and then deliver the exception... 3171 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 3172 } 3173 } 3174 else { 3175 // Either: 3176 // - target thread has not been started before being stopped, or 3177 // - target thread already terminated 3178 // We could read the threadStatus to determine which case it is 3179 // but that is overkill as it doesn't matter. We must set the 3180 // stillborn flag for the first case, and if the thread has already 3181 // exited setting this flag has no affect 3182 java_lang_Thread::set_stillborn(java_thread); 3183 } 3184 JVM_END 3185 3186 3187 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 3188 JVMWrapper("JVM_IsThreadAlive"); 3189 3190 oop thread_oop = JNIHandles::resolve_non_null(jthread); 3191 return java_lang_Thread::is_alive(thread_oop); 3192 JVM_END 3193 3194 3195 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 3196 JVMWrapper("JVM_SuspendThread"); 3197 oop java_thread = JNIHandles::resolve_non_null(jthread); 3198 JavaThread* receiver = java_lang_Thread::thread(java_thread); 3199 3200 if (receiver != NULL) { 3201 // thread has run and has not exited (still on threads list) 3202 3203 { 3204 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 3205 if (receiver->is_external_suspend()) { 3206 // Don't allow nested external suspend requests. We can't return 3207 // an error from this interface so just ignore the problem. 3208 return; 3209 } 3210 if (receiver->is_exiting()) { // thread is in the process of exiting 3211 return; 3212 } 3213 receiver->set_external_suspend(); 3214 } 3215 3216 // java_suspend() will catch threads in the process of exiting 3217 // and will ignore them. 3218 receiver->java_suspend(); 3219 3220 // It would be nice to have the following assertion in all the 3221 // time, but it is possible for a racing resume request to have 3222 // resumed this thread right after we suspended it. Temporarily 3223 // enable this assertion if you are chasing a different kind of 3224 // bug. 3225 // 3226 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 3227 // receiver->is_being_ext_suspended(), "thread is not suspended"); 3228 } 3229 JVM_END 3230 3231 3232 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 3233 JVMWrapper("JVM_ResumeThread"); 3234 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 3235 // We need to *always* get the threads lock here, since this operation cannot be allowed during 3236 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 3237 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 3238 // looks at it. 3239 MutexLocker ml(Threads_lock); 3240 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3241 if (thr != NULL) { 3242 // the thread has run and is not in the process of exiting 3243 thr->java_resume(); 3244 } 3245 JVM_END 3246 3247 3248 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3249 JVMWrapper("JVM_SetThreadPriority"); 3250 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3251 MutexLocker ml(Threads_lock); 3252 oop java_thread = JNIHandles::resolve_non_null(jthread); 3253 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3254 JavaThread* thr = java_lang_Thread::thread(java_thread); 3255 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 3256 Thread::set_priority(thr, (ThreadPriority)prio); 3257 } 3258 JVM_END 3259 3260 3261 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3262 JVMWrapper("JVM_Yield"); 3263 if (os::dont_yield()) return; 3264 #ifndef USDT2 3265 HS_DTRACE_PROBE0(hotspot, thread__yield); 3266 #else /* USDT2 */ 3267 HOTSPOT_THREAD_YIELD(); 3268 #endif /* USDT2 */ 3269 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield. 3270 // Critical for similar threading behaviour 3271 if (ConvertYieldToSleep) { 3272 os::sleep(thread, MinSleepInterval, false); 3273 } else { 3274 os::yield(); 3275 } 3276 JVM_END 3277 3278 3279 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3280 JVMWrapper("JVM_Sleep"); 3281 3282 if (millis < 0) { 3283 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3284 } 3285 3286 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 3287 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3288 } 3289 3290 // Save current thread state and restore it at the end of this block. 3291 // And set new thread state to SLEEPING. 3292 JavaThreadSleepState jtss(thread); 3293 3294 #ifndef USDT2 3295 HS_DTRACE_PROBE1(hotspot, thread__sleep__begin, millis); 3296 #else /* USDT2 */ 3297 HOTSPOT_THREAD_SLEEP_BEGIN( 3298 millis); 3299 #endif /* USDT2 */ 3300 3301 EventThreadSleep event; 3302 3303 if (millis == 0) { 3304 // When ConvertSleepToYield is on, this matches the classic VM implementation of 3305 // JVM_Sleep. Critical for similar threading behaviour (Win32) 3306 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep 3307 // for SOLARIS 3308 if (ConvertSleepToYield) { 3309 os::yield(); 3310 } else { 3311 ThreadState old_state = thread->osthread()->get_state(); 3312 thread->osthread()->set_state(SLEEPING); 3313 os::sleep(thread, MinSleepInterval, false); 3314 thread->osthread()->set_state(old_state); 3315 } 3316 } else { 3317 ThreadState old_state = thread->osthread()->get_state(); 3318 thread->osthread()->set_state(SLEEPING); 3319 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3320 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3321 // us while we were sleeping. We do not overwrite those. 3322 if (!HAS_PENDING_EXCEPTION) { 3323 if (event.should_commit()) { 3324 event.set_time(millis); 3325 event.commit(); 3326 } 3327 #ifndef USDT2 3328 HS_DTRACE_PROBE1(hotspot, thread__sleep__end,1); 3329 #else /* USDT2 */ 3330 HOTSPOT_THREAD_SLEEP_END( 3331 1); 3332 #endif /* USDT2 */ 3333 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3334 // to properly restore the thread state. That's likely wrong. 3335 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3336 } 3337 } 3338 thread->osthread()->set_state(old_state); 3339 } 3340 if (event.should_commit()) { 3341 event.set_time(millis); 3342 event.commit(); 3343 } 3344 #ifndef USDT2 3345 HS_DTRACE_PROBE1(hotspot, thread__sleep__end,0); 3346 #else /* USDT2 */ 3347 HOTSPOT_THREAD_SLEEP_END( 3348 0); 3349 #endif /* USDT2 */ 3350 JVM_END 3351 3352 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3353 JVMWrapper("JVM_CurrentThread"); 3354 oop jthread = thread->threadObj(); 3355 assert (thread != NULL, "no current thread!"); 3356 return JNIHandles::make_local(env, jthread); 3357 JVM_END 3358 3359 3360 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3361 JVMWrapper("JVM_CountStackFrames"); 3362 3363 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3364 oop java_thread = JNIHandles::resolve_non_null(jthread); 3365 bool throw_illegal_thread_state = false; 3366 int count = 0; 3367 3368 { 3369 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3370 // We need to re-resolve the java_thread, since a GC might have happened during the 3371 // acquire of the lock 3372 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3373 3374 if (thr == NULL) { 3375 // do nothing 3376 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 3377 // Check whether this java thread has been suspended already. If not, throws 3378 // IllegalThreadStateException. We defer to throw that exception until 3379 // Threads_lock is released since loading exception class has to leave VM. 3380 // The correct way to test a thread is actually suspended is 3381 // wait_for_ext_suspend_completion(), but we can't call that while holding 3382 // the Threads_lock. The above tests are sufficient for our purposes 3383 // provided the walkability of the stack is stable - which it isn't 3384 // 100% but close enough for most practical purposes. 3385 throw_illegal_thread_state = true; 3386 } else { 3387 // Count all java activation, i.e., number of vframes 3388 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 3389 // Native frames are not counted 3390 if (!vfst.method()->is_native()) count++; 3391 } 3392 } 3393 } 3394 3395 if (throw_illegal_thread_state) { 3396 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3397 "this thread is not suspended"); 3398 } 3399 return count; 3400 JVM_END 3401 3402 // Consider: A better way to implement JVM_Interrupt() is to acquire 3403 // Threads_lock to resolve the jthread into a Thread pointer, fetch 3404 // Thread->platformevent, Thread->native_thr, Thread->parker, etc., 3405 // drop Threads_lock, and the perform the unpark() and thr_kill() operations 3406 // outside the critical section. Threads_lock is hot so we want to minimize 3407 // the hold-time. A cleaner interface would be to decompose interrupt into 3408 // two steps. The 1st phase, performed under Threads_lock, would return 3409 // a closure that'd be invoked after Threads_lock was dropped. 3410 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 3411 // admit spurious wakeups. 3412 3413 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3414 JVMWrapper("JVM_Interrupt"); 3415 3416 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3417 oop java_thread = JNIHandles::resolve_non_null(jthread); 3418 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3419 // We need to re-resolve the java_thread, since a GC might have happened during the 3420 // acquire of the lock 3421 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3422 if (thr != NULL) { 3423 Thread::interrupt(thr); 3424 } 3425 JVM_END 3426 3427 3428 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3429 JVMWrapper("JVM_IsInterrupted"); 3430 3431 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3432 oop java_thread = JNIHandles::resolve_non_null(jthread); 3433 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3434 // We need to re-resolve the java_thread, since a GC might have happened during the 3435 // acquire of the lock 3436 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3437 if (thr == NULL) { 3438 return JNI_FALSE; 3439 } else { 3440 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3441 } 3442 JVM_END 3443 3444 3445 // Return true iff the current thread has locked the object passed in 3446 3447 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3448 JVMWrapper("JVM_HoldsLock"); 3449 assert(THREAD->is_Java_thread(), "sanity check"); 3450 if (obj == NULL) { 3451 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3452 } 3453 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3454 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3455 JVM_END 3456 3457 3458 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3459 JVMWrapper("JVM_DumpAllStacks"); 3460 VM_PrintThreads op; 3461 VMThread::execute(&op); 3462 if (JvmtiExport::should_post_data_dump()) { 3463 JvmtiExport::post_data_dump(); 3464 } 3465 JVM_END 3466 3467 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3468 JVMWrapper("JVM_SetNativeThreadName"); 3469 ResourceMark rm(THREAD); 3470 oop java_thread = JNIHandles::resolve_non_null(jthread); 3471 JavaThread* thr = java_lang_Thread::thread(java_thread); 3472 // Thread naming only supported for the current thread, doesn't work for 3473 // target threads. 3474 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3475 // we don't set the name of an attached thread to avoid stepping 3476 // on other programs 3477 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3478 os::set_native_thread_name(thread_name); 3479 } 3480 JVM_END 3481 3482 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3483 3484 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3485 assert(jthread->is_Java_thread(), "must be a Java thread"); 3486 if (jthread->privileged_stack_top() == NULL) return false; 3487 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3488 oop loader = jthread->privileged_stack_top()->class_loader(); 3489 if (loader == NULL) return true; 3490 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3491 if (trusted) return true; 3492 } 3493 return false; 3494 } 3495 3496 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3497 JVMWrapper("JVM_CurrentLoadedClass"); 3498 ResourceMark rm(THREAD); 3499 3500 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3501 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3502 bool trusted = is_trusted_frame(thread, &vfst); 3503 if (trusted) return NULL; 3504 3505 Method* m = vfst.method(); 3506 if (!m->is_native()) { 3507 InstanceKlass* holder = m->method_holder(); 3508 oop loader = holder->class_loader(); 3509 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3510 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3511 } 3512 } 3513 } 3514 return NULL; 3515 JVM_END 3516 3517 3518 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3519 JVMWrapper("JVM_CurrentClassLoader"); 3520 ResourceMark rm(THREAD); 3521 3522 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3523 3524 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3525 bool trusted = is_trusted_frame(thread, &vfst); 3526 if (trusted) return NULL; 3527 3528 Method* m = vfst.method(); 3529 if (!m->is_native()) { 3530 InstanceKlass* holder = m->method_holder(); 3531 assert(holder->is_klass(), "just checking"); 3532 oop loader = holder->class_loader(); 3533 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3534 return JNIHandles::make_local(env, loader); 3535 } 3536 } 3537 } 3538 return NULL; 3539 JVM_END 3540 3541 3542 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3543 JVMWrapper("JVM_GetClassContext"); 3544 ResourceMark rm(THREAD); 3545 JvmtiVMObjectAllocEventCollector oam; 3546 vframeStream vfst(thread); 3547 3548 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3549 // This must only be called from SecurityManager.getClassContext 3550 Method* m = vfst.method(); 3551 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3552 m->name() == vmSymbols::getClassContext_name() && 3553 m->signature() == vmSymbols::void_class_array_signature())) { 3554 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3555 } 3556 } 3557 3558 // Collect method holders 3559 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>(); 3560 for (; !vfst.at_end(); vfst.security_next()) { 3561 Method* m = vfst.method(); 3562 // Native frames are not returned 3563 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3564 Klass* holder = m->method_holder(); 3565 assert(holder->is_klass(), "just checking"); 3566 klass_array->append(holder); 3567 } 3568 } 3569 3570 // Create result array of type [Ljava/lang/Class; 3571 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3572 // Fill in mirrors corresponding to method holders 3573 for (int i = 0; i < klass_array->length(); i++) { 3574 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3575 } 3576 3577 return (jobjectArray) JNIHandles::make_local(env, result); 3578 JVM_END 3579 3580 3581 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3582 JVMWrapper("JVM_ClassDepth"); 3583 ResourceMark rm(THREAD); 3584 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3585 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3586 3587 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3588 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3589 if (class_name_sym == NULL) { 3590 return -1; 3591 } 3592 3593 int depth = 0; 3594 3595 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3596 if (!vfst.method()->is_native()) { 3597 InstanceKlass* holder = vfst.method()->method_holder(); 3598 assert(holder->is_klass(), "just checking"); 3599 if (holder->name() == class_name_sym) { 3600 return depth; 3601 } 3602 depth++; 3603 } 3604 } 3605 return -1; 3606 JVM_END 3607 3608 3609 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3610 JVMWrapper("JVM_ClassLoaderDepth"); 3611 ResourceMark rm(THREAD); 3612 int depth = 0; 3613 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3614 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3615 bool trusted = is_trusted_frame(thread, &vfst); 3616 if (trusted) return -1; 3617 3618 Method* m = vfst.method(); 3619 if (!m->is_native()) { 3620 InstanceKlass* holder = m->method_holder(); 3621 assert(holder->is_klass(), "just checking"); 3622 oop loader = holder->class_loader(); 3623 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3624 return depth; 3625 } 3626 depth++; 3627 } 3628 } 3629 return -1; 3630 JVM_END 3631 3632 3633 // java.lang.Package //////////////////////////////////////////////////////////////// 3634 3635 3636 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3637 JVMWrapper("JVM_GetSystemPackage"); 3638 ResourceMark rm(THREAD); 3639 JvmtiVMObjectAllocEventCollector oam; 3640 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3641 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3642 return (jstring) JNIHandles::make_local(result); 3643 JVM_END 3644 3645 3646 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3647 JVMWrapper("JVM_GetSystemPackages"); 3648 JvmtiVMObjectAllocEventCollector oam; 3649 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3650 return (jobjectArray) JNIHandles::make_local(result); 3651 JVM_END 3652 3653 3654 // ObjectInputStream /////////////////////////////////////////////////////////////// 3655 3656 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3657 if (current_class == NULL) { 3658 return true; 3659 } 3660 if ((current_class == field_class) || access.is_public()) { 3661 return true; 3662 } 3663 3664 if (access.is_protected()) { 3665 // See if current_class is a subclass of field_class 3666 if (current_class->is_subclass_of(field_class)) { 3667 return true; 3668 } 3669 } 3670 3671 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3672 } 3673 3674 3675 // JVM_AllocateNewObject and JVM_AllocateNewArray are unused as of 1.4 3676 JVM_ENTRY(jobject, JVM_AllocateNewObject(JNIEnv *env, jobject receiver, jclass currClass, jclass initClass)) 3677 JVMWrapper("JVM_AllocateNewObject"); 3678 JvmtiVMObjectAllocEventCollector oam; 3679 // Receiver is not used 3680 oop curr_mirror = JNIHandles::resolve_non_null(currClass); 3681 oop init_mirror = JNIHandles::resolve_non_null(initClass); 3682 3683 // Cannot instantiate primitive types 3684 if (java_lang_Class::is_primitive(curr_mirror) || java_lang_Class::is_primitive(init_mirror)) { 3685 ResourceMark rm(THREAD); 3686 THROW_0(vmSymbols::java_lang_InvalidClassException()); 3687 } 3688 3689 // Arrays not allowed here, must use JVM_AllocateNewArray 3690 if (java_lang_Class::as_Klass(curr_mirror)->oop_is_array() || 3691 java_lang_Class::as_Klass(init_mirror)->oop_is_array()) { 3692 ResourceMark rm(THREAD); 3693 THROW_0(vmSymbols::java_lang_InvalidClassException()); 3694 } 3695 3696 instanceKlassHandle curr_klass (THREAD, java_lang_Class::as_Klass(curr_mirror)); 3697 instanceKlassHandle init_klass (THREAD, java_lang_Class::as_Klass(init_mirror)); 3698 3699 assert(curr_klass->is_subclass_of(init_klass()), "just checking"); 3700 3701 // Interfaces, abstract classes, and java.lang.Class classes cannot be instantiated directly. 3702 curr_klass->check_valid_for_instantiation(false, CHECK_NULL); 3703 3704 // Make sure klass is initialized, since we are about to instantiate one of them. 3705 curr_klass->initialize(CHECK_NULL); 3706 3707 methodHandle m (THREAD, 3708 init_klass->find_method(vmSymbols::object_initializer_name(), 3709 vmSymbols::void_method_signature())); 3710 if (m.is_null()) { 3711 ResourceMark rm(THREAD); 3712 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), 3713 Method::name_and_sig_as_C_string(init_klass(), 3714 vmSymbols::object_initializer_name(), 3715 vmSymbols::void_method_signature())); 3716 } 3717 3718 if (curr_klass == init_klass && !m->is_public()) { 3719 // Calling the constructor for class 'curr_klass'. 3720 // Only allow calls to a public no-arg constructor. 3721 // This path corresponds to creating an Externalizable object. 3722 THROW_0(vmSymbols::java_lang_IllegalAccessException()); 3723 } 3724 3725 if (!force_verify_field_access(curr_klass(), init_klass(), m->access_flags(), false)) { 3726 // subclass 'curr_klass' does not have access to no-arg constructor of 'initcb' 3727 THROW_0(vmSymbols::java_lang_IllegalAccessException()); 3728 } 3729 3730 Handle obj = curr_klass->allocate_instance_handle(CHECK_NULL); 3731 // Call constructor m. This might call a constructor higher up in the hierachy 3732 JavaCalls::call_default_constructor(thread, m, obj, CHECK_NULL); 3733 3734 return JNIHandles::make_local(obj()); 3735 JVM_END 3736 3737 3738 JVM_ENTRY(jobject, JVM_AllocateNewArray(JNIEnv *env, jobject obj, jclass currClass, jint length)) 3739 JVMWrapper("JVM_AllocateNewArray"); 3740 JvmtiVMObjectAllocEventCollector oam; 3741 oop mirror = JNIHandles::resolve_non_null(currClass); 3742 3743 if (java_lang_Class::is_primitive(mirror)) { 3744 THROW_0(vmSymbols::java_lang_InvalidClassException()); 3745 } 3746 Klass* k = java_lang_Class::as_Klass(mirror); 3747 oop result; 3748 3749 if (k->oop_is_typeArray()) { 3750 // typeArray 3751 result = TypeArrayKlass::cast(k)->allocate(length, CHECK_NULL); 3752 } else if (k->oop_is_objArray()) { 3753 // objArray 3754 ObjArrayKlass* oak = ObjArrayKlass::cast(k); 3755 oak->initialize(CHECK_NULL); // make sure class is initialized (matches Classic VM behavior) 3756 result = oak->allocate(length, CHECK_NULL); 3757 } else { 3758 THROW_0(vmSymbols::java_lang_InvalidClassException()); 3759 } 3760 return JNIHandles::make_local(env, result); 3761 JVM_END 3762 3763 3764 // Returns first non-privileged class loader on the stack (excluding reflection 3765 // generated frames) or null if only classes loaded by the boot class loader 3766 // and extension class loader are found on the stack. 3767 3768 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3769 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3770 // UseNewReflection 3771 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3772 oop loader = vfst.method()->method_holder()->class_loader(); 3773 if (loader != NULL && !SystemDictionary::is_ext_class_loader(loader)) { 3774 return JNIHandles::make_local(env, loader); 3775 } 3776 } 3777 return NULL; 3778 JVM_END 3779 3780 3781 // Load a class relative to the most recent class on the stack with a non-null 3782 // classloader. 3783 // This function has been deprecated and should not be considered part of the 3784 // specified JVM interface. 3785 3786 JVM_ENTRY(jclass, JVM_LoadClass0(JNIEnv *env, jobject receiver, 3787 jclass currClass, jstring currClassName)) 3788 JVMWrapper("JVM_LoadClass0"); 3789 // Receiver is not used 3790 ResourceMark rm(THREAD); 3791 3792 // Class name argument is not guaranteed to be in internal format 3793 Handle classname (THREAD, JNIHandles::resolve_non_null(currClassName)); 3794 Handle string = java_lang_String::internalize_classname(classname, CHECK_NULL); 3795 3796 const char* str = java_lang_String::as_utf8_string(string()); 3797 3798 if (str == NULL || (int)strlen(str) > Symbol::max_length()) { 3799 // It's impossible to create this class; the name cannot fit 3800 // into the constant pool. 3801 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), str); 3802 } 3803 3804 TempNewSymbol name = SymbolTable::new_symbol(str, CHECK_NULL); 3805 Handle curr_klass (THREAD, JNIHandles::resolve(currClass)); 3806 // Find the most recent class on the stack with a non-null classloader 3807 oop loader = NULL; 3808 oop protection_domain = NULL; 3809 if (curr_klass.is_null()) { 3810 for (vframeStream vfst(thread); 3811 !vfst.at_end() && loader == NULL; 3812 vfst.next()) { 3813 if (!vfst.method()->is_native()) { 3814 InstanceKlass* holder = vfst.method()->method_holder(); 3815 loader = holder->class_loader(); 3816 protection_domain = holder->protection_domain(); 3817 } 3818 } 3819 } else { 3820 Klass* curr_klass_oop = java_lang_Class::as_Klass(curr_klass()); 3821 loader = InstanceKlass::cast(curr_klass_oop)->class_loader(); 3822 protection_domain = InstanceKlass::cast(curr_klass_oop)->protection_domain(); 3823 } 3824 Handle h_loader(THREAD, loader); 3825 Handle h_prot (THREAD, protection_domain); 3826 jclass result = find_class_from_class_loader(env, name, true, h_loader, h_prot, 3827 false, thread); 3828 if (TraceClassResolution && result != NULL) { 3829 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 3830 } 3831 return result; 3832 JVM_END 3833 3834 3835 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3836 3837 3838 // resolve array handle and check arguments 3839 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3840 if (arr == NULL) { 3841 THROW_0(vmSymbols::java_lang_NullPointerException()); 3842 } 3843 oop a = JNIHandles::resolve_non_null(arr); 3844 if (!a->is_array() || (type_array_only && !a->is_typeArray())) { 3845 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3846 } 3847 return arrayOop(a); 3848 } 3849 3850 3851 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3852 JVMWrapper("JVM_GetArrayLength"); 3853 arrayOop a = check_array(env, arr, false, CHECK_0); 3854 return a->length(); 3855 JVM_END 3856 3857 3858 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3859 JVMWrapper("JVM_Array_Get"); 3860 JvmtiVMObjectAllocEventCollector oam; 3861 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3862 jvalue value; 3863 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3864 oop box = Reflection::box(&value, type, CHECK_NULL); 3865 return JNIHandles::make_local(env, box); 3866 JVM_END 3867 3868 3869 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3870 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3871 jvalue value; 3872 value.i = 0; // to initialize value before getting used in CHECK 3873 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3874 assert(a->is_typeArray(), "just checking"); 3875 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3876 BasicType wide_type = (BasicType) wCode; 3877 if (type != wide_type) { 3878 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3879 } 3880 return value; 3881 JVM_END 3882 3883 3884 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3885 JVMWrapper("JVM_SetArrayElement"); 3886 arrayOop a = check_array(env, arr, false, CHECK); 3887 oop box = JNIHandles::resolve(val); 3888 jvalue value; 3889 value.i = 0; // to initialize value before getting used in CHECK 3890 BasicType value_type; 3891 if (a->is_objArray()) { 3892 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3893 value_type = Reflection::unbox_for_regular_object(box, &value); 3894 } else { 3895 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3896 } 3897 Reflection::array_set(&value, a, index, value_type, CHECK); 3898 JVM_END 3899 3900 3901 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3902 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3903 arrayOop a = check_array(env, arr, true, CHECK); 3904 assert(a->is_typeArray(), "just checking"); 3905 BasicType value_type = (BasicType) vCode; 3906 Reflection::array_set(&v, a, index, value_type, CHECK); 3907 JVM_END 3908 3909 3910 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3911 JVMWrapper("JVM_NewArray"); 3912 JvmtiVMObjectAllocEventCollector oam; 3913 oop element_mirror = JNIHandles::resolve(eltClass); 3914 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3915 return JNIHandles::make_local(env, result); 3916 JVM_END 3917 3918 3919 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3920 JVMWrapper("JVM_NewMultiArray"); 3921 JvmtiVMObjectAllocEventCollector oam; 3922 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3923 oop element_mirror = JNIHandles::resolve(eltClass); 3924 assert(dim_array->is_typeArray(), "just checking"); 3925 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3926 return JNIHandles::make_local(env, result); 3927 JVM_END 3928 3929 3930 // Networking library support //////////////////////////////////////////////////////////////////// 3931 3932 JVM_LEAF(jint, JVM_InitializeSocketLibrary()) 3933 JVMWrapper("JVM_InitializeSocketLibrary"); 3934 return 0; 3935 JVM_END 3936 3937 3938 JVM_LEAF(jint, JVM_Socket(jint domain, jint type, jint protocol)) 3939 JVMWrapper("JVM_Socket"); 3940 return os::socket(domain, type, protocol); 3941 JVM_END 3942 3943 3944 JVM_LEAF(jint, JVM_SocketClose(jint fd)) 3945 JVMWrapper2("JVM_SocketClose (0x%x)", fd); 3946 //%note jvm_r6 3947 return os::socket_close(fd); 3948 JVM_END 3949 3950 3951 JVM_LEAF(jint, JVM_SocketShutdown(jint fd, jint howto)) 3952 JVMWrapper2("JVM_SocketShutdown (0x%x)", fd); 3953 //%note jvm_r6 3954 return os::socket_shutdown(fd, howto); 3955 JVM_END 3956 3957 3958 JVM_LEAF(jint, JVM_Recv(jint fd, char *buf, jint nBytes, jint flags)) 3959 JVMWrapper2("JVM_Recv (0x%x)", fd); 3960 //%note jvm_r6 3961 return os::recv(fd, buf, (size_t)nBytes, (uint)flags); 3962 JVM_END 3963 3964 3965 JVM_LEAF(jint, JVM_Send(jint fd, char *buf, jint nBytes, jint flags)) 3966 JVMWrapper2("JVM_Send (0x%x)", fd); 3967 //%note jvm_r6 3968 return os::send(fd, buf, (size_t)nBytes, (uint)flags); 3969 JVM_END 3970 3971 3972 JVM_LEAF(jint, JVM_Timeout(int fd, long timeout)) 3973 JVMWrapper2("JVM_Timeout (0x%x)", fd); 3974 //%note jvm_r6 3975 return os::timeout(fd, timeout); 3976 JVM_END 3977 3978 3979 JVM_LEAF(jint, JVM_Listen(jint fd, jint count)) 3980 JVMWrapper2("JVM_Listen (0x%x)", fd); 3981 //%note jvm_r6 3982 return os::listen(fd, count); 3983 JVM_END 3984 3985 3986 JVM_LEAF(jint, JVM_Connect(jint fd, struct sockaddr *him, jint len)) 3987 JVMWrapper2("JVM_Connect (0x%x)", fd); 3988 //%note jvm_r6 3989 return os::connect(fd, him, (socklen_t)len); 3990 JVM_END 3991 3992 3993 JVM_LEAF(jint, JVM_Bind(jint fd, struct sockaddr *him, jint len)) 3994 JVMWrapper2("JVM_Bind (0x%x)", fd); 3995 //%note jvm_r6 3996 return os::bind(fd, him, (socklen_t)len); 3997 JVM_END 3998 3999 4000 JVM_LEAF(jint, JVM_Accept(jint fd, struct sockaddr *him, jint *len)) 4001 JVMWrapper2("JVM_Accept (0x%x)", fd); 4002 //%note jvm_r6 4003 socklen_t socklen = (socklen_t)(*len); 4004 jint result = os::accept(fd, him, &socklen); 4005 *len = (jint)socklen; 4006 return result; 4007 JVM_END 4008 4009 4010 JVM_LEAF(jint, JVM_RecvFrom(jint fd, char *buf, int nBytes, int flags, struct sockaddr *from, int *fromlen)) 4011 JVMWrapper2("JVM_RecvFrom (0x%x)", fd); 4012 //%note jvm_r6 4013 socklen_t socklen = (socklen_t)(*fromlen); 4014 jint result = os::recvfrom(fd, buf, (size_t)nBytes, (uint)flags, from, &socklen); 4015 *fromlen = (int)socklen; 4016 return result; 4017 JVM_END 4018 4019 4020 JVM_LEAF(jint, JVM_GetSockName(jint fd, struct sockaddr *him, int *len)) 4021 JVMWrapper2("JVM_GetSockName (0x%x)", fd); 4022 //%note jvm_r6 4023 socklen_t socklen = (socklen_t)(*len); 4024 jint result = os::get_sock_name(fd, him, &socklen); 4025 *len = (int)socklen; 4026 return result; 4027 JVM_END 4028 4029 4030 JVM_LEAF(jint, JVM_SendTo(jint fd, char *buf, int len, int flags, struct sockaddr *to, int tolen)) 4031 JVMWrapper2("JVM_SendTo (0x%x)", fd); 4032 //%note jvm_r6 4033 return os::sendto(fd, buf, (size_t)len, (uint)flags, to, (socklen_t)tolen); 4034 JVM_END 4035 4036 4037 JVM_LEAF(jint, JVM_SocketAvailable(jint fd, jint *pbytes)) 4038 JVMWrapper2("JVM_SocketAvailable (0x%x)", fd); 4039 //%note jvm_r6 4040 return os::socket_available(fd, pbytes); 4041 JVM_END 4042 4043 4044 JVM_LEAF(jint, JVM_GetSockOpt(jint fd, int level, int optname, char *optval, int *optlen)) 4045 JVMWrapper2("JVM_GetSockOpt (0x%x)", fd); 4046 //%note jvm_r6 4047 socklen_t socklen = (socklen_t)(*optlen); 4048 jint result = os::get_sock_opt(fd, level, optname, optval, &socklen); 4049 *optlen = (int)socklen; 4050 return result; 4051 JVM_END 4052 4053 4054 JVM_LEAF(jint, JVM_SetSockOpt(jint fd, int level, int optname, const char *optval, int optlen)) 4055 JVMWrapper2("JVM_GetSockOpt (0x%x)", fd); 4056 //%note jvm_r6 4057 return os::set_sock_opt(fd, level, optname, optval, (socklen_t)optlen); 4058 JVM_END 4059 4060 4061 JVM_LEAF(int, JVM_GetHostName(char* name, int namelen)) 4062 JVMWrapper("JVM_GetHostName"); 4063 return os::get_host_name(name, namelen); 4064 JVM_END 4065 4066 4067 // Library support /////////////////////////////////////////////////////////////////////////// 4068 4069 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 4070 //%note jvm_ct 4071 JVMWrapper2("JVM_LoadLibrary (%s)", name); 4072 char ebuf[1024]; 4073 void *load_result; 4074 { 4075 ThreadToNativeFromVM ttnfvm(thread); 4076 load_result = os::dll_load(name, ebuf, sizeof ebuf); 4077 } 4078 if (load_result == NULL) { 4079 char msg[1024]; 4080 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 4081 // Since 'ebuf' may contain a string encoded using 4082 // platform encoding scheme, we need to pass 4083 // Exceptions::unsafe_to_utf8 to the new_exception method 4084 // as the last argument. See bug 6367357. 4085 Handle h_exception = 4086 Exceptions::new_exception(thread, 4087 vmSymbols::java_lang_UnsatisfiedLinkError(), 4088 msg, Exceptions::unsafe_to_utf8); 4089 4090 THROW_HANDLE_0(h_exception); 4091 } 4092 return load_result; 4093 JVM_END 4094 4095 4096 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 4097 JVMWrapper("JVM_UnloadLibrary"); 4098 os::dll_unload(handle); 4099 JVM_END 4100 4101 4102 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 4103 JVMWrapper2("JVM_FindLibraryEntry (%s)", name); 4104 return os::dll_lookup(handle, name); 4105 JVM_END 4106 4107 4108 // Floating point support //////////////////////////////////////////////////////////////////// 4109 4110 JVM_LEAF(jboolean, JVM_IsNaN(jdouble a)) 4111 JVMWrapper("JVM_IsNaN"); 4112 return g_isnan(a); 4113 JVM_END 4114 4115 4116 // JNI version /////////////////////////////////////////////////////////////////////////////// 4117 4118 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 4119 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version); 4120 return Threads::is_supported_jni_version_including_1_1(version); 4121 JVM_END 4122 4123 4124 // String support /////////////////////////////////////////////////////////////////////////// 4125 4126 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 4127 JVMWrapper("JVM_InternString"); 4128 JvmtiVMObjectAllocEventCollector oam; 4129 if (str == NULL) return NULL; 4130 oop string = JNIHandles::resolve_non_null(str); 4131 oop result = StringTable::intern(string, CHECK_NULL); 4132 return (jstring) JNIHandles::make_local(env, result); 4133 JVM_END 4134 4135 4136 // Raw monitor support ////////////////////////////////////////////////////////////////////// 4137 4138 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 4139 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 4140 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 4141 // that only works with java threads. 4142 4143 4144 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 4145 VM_Exit::block_if_vm_exited(); 4146 JVMWrapper("JVM_RawMonitorCreate"); 4147 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 4148 } 4149 4150 4151 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 4152 VM_Exit::block_if_vm_exited(); 4153 JVMWrapper("JVM_RawMonitorDestroy"); 4154 delete ((Mutex*) mon); 4155 } 4156 4157 4158 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 4159 VM_Exit::block_if_vm_exited(); 4160 JVMWrapper("JVM_RawMonitorEnter"); 4161 ((Mutex*) mon)->jvm_raw_lock(); 4162 return 0; 4163 } 4164 4165 4166 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 4167 VM_Exit::block_if_vm_exited(); 4168 JVMWrapper("JVM_RawMonitorExit"); 4169 ((Mutex*) mon)->jvm_raw_unlock(); 4170 } 4171 4172 4173 // Support for Serialization 4174 4175 typedef jfloat (JNICALL *IntBitsToFloatFn )(JNIEnv* env, jclass cb, jint value); 4176 typedef jdouble (JNICALL *LongBitsToDoubleFn)(JNIEnv* env, jclass cb, jlong value); 4177 typedef jint (JNICALL *FloatToIntBitsFn )(JNIEnv* env, jclass cb, jfloat value); 4178 typedef jlong (JNICALL *DoubleToLongBitsFn)(JNIEnv* env, jclass cb, jdouble value); 4179 4180 static IntBitsToFloatFn int_bits_to_float_fn = NULL; 4181 static LongBitsToDoubleFn long_bits_to_double_fn = NULL; 4182 static FloatToIntBitsFn float_to_int_bits_fn = NULL; 4183 static DoubleToLongBitsFn double_to_long_bits_fn = NULL; 4184 4185 4186 void initialize_converter_functions() { 4187 if (JDK_Version::is_gte_jdk14x_version()) { 4188 // These functions only exist for compatibility with 1.3.1 and earlier 4189 return; 4190 } 4191 4192 // called from universe_post_init() 4193 assert( 4194 int_bits_to_float_fn == NULL && 4195 long_bits_to_double_fn == NULL && 4196 float_to_int_bits_fn == NULL && 4197 double_to_long_bits_fn == NULL , 4198 "initialization done twice" 4199 ); 4200 // initialize 4201 int_bits_to_float_fn = CAST_TO_FN_PTR(IntBitsToFloatFn , NativeLookup::base_library_lookup("java/lang/Float" , "intBitsToFloat" , "(I)F")); 4202 long_bits_to_double_fn = CAST_TO_FN_PTR(LongBitsToDoubleFn, NativeLookup::base_library_lookup("java/lang/Double", "longBitsToDouble", "(J)D")); 4203 float_to_int_bits_fn = CAST_TO_FN_PTR(FloatToIntBitsFn , NativeLookup::base_library_lookup("java/lang/Float" , "floatToIntBits" , "(F)I")); 4204 double_to_long_bits_fn = CAST_TO_FN_PTR(DoubleToLongBitsFn, NativeLookup::base_library_lookup("java/lang/Double", "doubleToLongBits", "(D)J")); 4205 // verify 4206 assert( 4207 int_bits_to_float_fn != NULL && 4208 long_bits_to_double_fn != NULL && 4209 float_to_int_bits_fn != NULL && 4210 double_to_long_bits_fn != NULL , 4211 "initialization failed" 4212 ); 4213 } 4214 4215 4216 4217 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 4218 4219 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 4220 Handle loader, Handle protection_domain, 4221 jboolean throwError, TRAPS) { 4222 // Security Note: 4223 // The Java level wrapper will perform the necessary security check allowing 4224 // us to pass the NULL as the initiating class loader. The VM is responsible for 4225 // the checkPackageAccess relative to the initiating class loader via the 4226 // protection_domain. The protection_domain is passed as NULL by the java code 4227 // if there is no security manager in 3-arg Class.forName(). 4228 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 4229 4230 KlassHandle klass_handle(THREAD, klass); 4231 // Check if we should initialize the class 4232 if (init && klass_handle->oop_is_instance()) { 4233 klass_handle->initialize(CHECK_NULL); 4234 } 4235 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror()); 4236 } 4237 4238 4239 // Internal SQE debugging support /////////////////////////////////////////////////////////// 4240 4241 #ifndef PRODUCT 4242 4243 extern "C" { 4244 JNIEXPORT jboolean JNICALL JVM_AccessVMBooleanFlag(const char* name, jboolean* value, jboolean is_get); 4245 JNIEXPORT jboolean JNICALL JVM_AccessVMIntFlag(const char* name, jint* value, jboolean is_get); 4246 JNIEXPORT void JNICALL JVM_VMBreakPoint(JNIEnv *env, jobject obj); 4247 } 4248 4249 JVM_LEAF(jboolean, JVM_AccessVMBooleanFlag(const char* name, jboolean* value, jboolean is_get)) 4250 JVMWrapper("JVM_AccessBoolVMFlag"); 4251 return is_get ? CommandLineFlags::boolAt((char*) name, (bool*) value) : CommandLineFlags::boolAtPut((char*) name, (bool*) value, Flag::INTERNAL); 4252 JVM_END 4253 4254 JVM_LEAF(jboolean, JVM_AccessVMIntFlag(const char* name, jint* value, jboolean is_get)) 4255 JVMWrapper("JVM_AccessVMIntFlag"); 4256 intx v; 4257 jboolean result = is_get ? CommandLineFlags::intxAt((char*) name, &v) : CommandLineFlags::intxAtPut((char*) name, &v, Flag::INTERNAL); 4258 *value = (jint)v; 4259 return result; 4260 JVM_END 4261 4262 4263 JVM_ENTRY(void, JVM_VMBreakPoint(JNIEnv *env, jobject obj)) 4264 JVMWrapper("JVM_VMBreakPoint"); 4265 oop the_obj = JNIHandles::resolve(obj); 4266 BREAKPOINT; 4267 JVM_END 4268 4269 4270 #endif 4271 4272 4273 // Method /////////////////////////////////////////////////////////////////////////////////////////// 4274 4275 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 4276 JVMWrapper("JVM_InvokeMethod"); 4277 Handle method_handle; 4278 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 4279 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 4280 Handle receiver(THREAD, JNIHandles::resolve(obj)); 4281 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 4282 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 4283 jobject res = JNIHandles::make_local(env, result); 4284 if (JvmtiExport::should_post_vm_object_alloc()) { 4285 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 4286 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 4287 if (java_lang_Class::is_primitive(ret_type)) { 4288 // Only for primitive type vm allocates memory for java object. 4289 // See box() method. 4290 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 4291 } 4292 } 4293 return res; 4294 } else { 4295 THROW_0(vmSymbols::java_lang_StackOverflowError()); 4296 } 4297 JVM_END 4298 4299 4300 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 4301 JVMWrapper("JVM_NewInstanceFromConstructor"); 4302 oop constructor_mirror = JNIHandles::resolve(c); 4303 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 4304 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 4305 jobject res = JNIHandles::make_local(env, result); 4306 if (JvmtiExport::should_post_vm_object_alloc()) { 4307 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 4308 } 4309 return res; 4310 JVM_END 4311 4312 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 4313 4314 JVM_LEAF(jboolean, JVM_SupportsCX8()) 4315 JVMWrapper("JVM_SupportsCX8"); 4316 return VM_Version::supports_cx8(); 4317 JVM_END 4318 4319 4320 JVM_ENTRY(jboolean, JVM_CX8Field(JNIEnv *env, jobject obj, jfieldID fid, jlong oldVal, jlong newVal)) 4321 JVMWrapper("JVM_CX8Field"); 4322 jlong res; 4323 oop o = JNIHandles::resolve(obj); 4324 intptr_t fldOffs = jfieldIDWorkaround::from_instance_jfieldID(o->klass(), fid); 4325 volatile jlong* addr = (volatile jlong*)((address)o + fldOffs); 4326 4327 assert(VM_Version::supports_cx8(), "cx8 not supported"); 4328 res = Atomic::cmpxchg(newVal, addr, oldVal); 4329 4330 return res == oldVal; 4331 JVM_END 4332 4333 // DTrace /////////////////////////////////////////////////////////////////// 4334 4335 JVM_ENTRY(jint, JVM_DTraceGetVersion(JNIEnv* env)) 4336 JVMWrapper("JVM_DTraceGetVersion"); 4337 return (jint)JVM_TRACING_DTRACE_VERSION; 4338 JVM_END 4339 4340 JVM_ENTRY(jlong,JVM_DTraceActivate( 4341 JNIEnv* env, jint version, jstring module_name, jint providers_count, 4342 JVM_DTraceProvider* providers)) 4343 JVMWrapper("JVM_DTraceActivate"); 4344 return DTraceJSDT::activate( 4345 version, module_name, providers_count, providers, CHECK_0); 4346 JVM_END 4347 4348 JVM_ENTRY(jboolean,JVM_DTraceIsProbeEnabled(JNIEnv* env, jmethodID method)) 4349 JVMWrapper("JVM_DTraceIsProbeEnabled"); 4350 return DTraceJSDT::is_probe_enabled(method); 4351 JVM_END 4352 4353 JVM_ENTRY(void,JVM_DTraceDispose(JNIEnv* env, jlong handle)) 4354 JVMWrapper("JVM_DTraceDispose"); 4355 DTraceJSDT::dispose(handle); 4356 JVM_END 4357 4358 JVM_ENTRY(jboolean,JVM_DTraceIsSupported(JNIEnv* env)) 4359 JVMWrapper("JVM_DTraceIsSupported"); 4360 return DTraceJSDT::is_supported(); 4361 JVM_END 4362 4363 // Returns an array of all live Thread objects (VM internal JavaThreads, 4364 // jvmti agent threads, and JNI attaching threads are skipped) 4365 // See CR 6404306 regarding JNI attaching threads 4366 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 4367 ResourceMark rm(THREAD); 4368 ThreadsListEnumerator tle(THREAD, false, false); 4369 JvmtiVMObjectAllocEventCollector oam; 4370 4371 int num_threads = tle.num_threads(); 4372 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 4373 objArrayHandle threads_ah(THREAD, r); 4374 4375 for (int i = 0; i < num_threads; i++) { 4376 Handle h = tle.get_threadObj(i); 4377 threads_ah->obj_at_put(i, h()); 4378 } 4379 4380 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 4381 JVM_END 4382 4383 4384 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 4385 // Return StackTraceElement[][], each element is the stack trace of a thread in 4386 // the corresponding entry in the given threads array 4387 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 4388 JVMWrapper("JVM_DumpThreads"); 4389 JvmtiVMObjectAllocEventCollector oam; 4390 4391 // Check if threads is null 4392 if (threads == NULL) { 4393 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 4394 } 4395 4396 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 4397 objArrayHandle ah(THREAD, a); 4398 int num_threads = ah->length(); 4399 // check if threads is non-empty array 4400 if (num_threads == 0) { 4401 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 4402 } 4403 4404 // check if threads is not an array of objects of Thread class 4405 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 4406 if (k != SystemDictionary::Thread_klass()) { 4407 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 4408 } 4409 4410 ResourceMark rm(THREAD); 4411 4412 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 4413 for (int i = 0; i < num_threads; i++) { 4414 oop thread_obj = ah->obj_at(i); 4415 instanceHandle h(THREAD, (instanceOop) thread_obj); 4416 thread_handle_array->append(h); 4417 } 4418 4419 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 4420 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 4421 4422 JVM_END 4423 4424 // JVM monitoring and management support 4425 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 4426 return Management::get_jmm_interface(version); 4427 JVM_END 4428 4429 // com.sun.tools.attach.VirtualMachine agent properties support 4430 // 4431 // Initialize the agent properties with the properties maintained in the VM 4432 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 4433 JVMWrapper("JVM_InitAgentProperties"); 4434 ResourceMark rm; 4435 4436 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 4437 4438 PUTPROP(props, "sun.java.command", Arguments::java_command()); 4439 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 4440 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 4441 return properties; 4442 JVM_END 4443 4444 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 4445 { 4446 JVMWrapper("JVM_GetEnclosingMethodInfo"); 4447 JvmtiVMObjectAllocEventCollector oam; 4448 4449 if (ofClass == NULL) { 4450 return NULL; 4451 } 4452 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 4453 // Special handling for primitive objects 4454 if (java_lang_Class::is_primitive(mirror())) { 4455 return NULL; 4456 } 4457 Klass* k = java_lang_Class::as_Klass(mirror()); 4458 if (!k->oop_is_instance()) { 4459 return NULL; 4460 } 4461 instanceKlassHandle ik_h(THREAD, k); 4462 int encl_method_class_idx = ik_h->enclosing_method_class_index(); 4463 if (encl_method_class_idx == 0) { 4464 return NULL; 4465 } 4466 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 4467 objArrayHandle dest(THREAD, dest_o); 4468 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 4469 dest->obj_at_put(0, enc_k->java_mirror()); 4470 int encl_method_method_idx = ik_h->enclosing_method_method_index(); 4471 if (encl_method_method_idx != 0) { 4472 Symbol* sym = ik_h->constants()->symbol_at( 4473 extract_low_short_from_int( 4474 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 4475 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 4476 dest->obj_at_put(1, str()); 4477 sym = ik_h->constants()->symbol_at( 4478 extract_high_short_from_int( 4479 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 4480 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 4481 dest->obj_at_put(2, str()); 4482 } 4483 return (jobjectArray) JNIHandles::make_local(dest()); 4484 } 4485 JVM_END 4486 4487 JVM_ENTRY(jintArray, JVM_GetThreadStateValues(JNIEnv* env, 4488 jint javaThreadState)) 4489 { 4490 // If new thread states are added in future JDK and VM versions, 4491 // this should check if the JDK version is compatible with thread 4492 // states supported by the VM. Return NULL if not compatible. 4493 // 4494 // This function must map the VM java_lang_Thread::ThreadStatus 4495 // to the Java thread state that the JDK supports. 4496 // 4497 4498 typeArrayHandle values_h; 4499 switch (javaThreadState) { 4500 case JAVA_THREAD_STATE_NEW : { 4501 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL); 4502 values_h = typeArrayHandle(THREAD, r); 4503 values_h->int_at_put(0, java_lang_Thread::NEW); 4504 break; 4505 } 4506 case JAVA_THREAD_STATE_RUNNABLE : { 4507 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL); 4508 values_h = typeArrayHandle(THREAD, r); 4509 values_h->int_at_put(0, java_lang_Thread::RUNNABLE); 4510 break; 4511 } 4512 case JAVA_THREAD_STATE_BLOCKED : { 4513 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL); 4514 values_h = typeArrayHandle(THREAD, r); 4515 values_h->int_at_put(0, java_lang_Thread::BLOCKED_ON_MONITOR_ENTER); 4516 break; 4517 } 4518 case JAVA_THREAD_STATE_WAITING : { 4519 typeArrayOop r = oopFactory::new_typeArray(T_INT, 2, CHECK_NULL); 4520 values_h = typeArrayHandle(THREAD, r); 4521 values_h->int_at_put(0, java_lang_Thread::IN_OBJECT_WAIT); 4522 values_h->int_at_put(1, java_lang_Thread::PARKED); 4523 break; 4524 } 4525 case JAVA_THREAD_STATE_TIMED_WAITING : { 4526 typeArrayOop r = oopFactory::new_typeArray(T_INT, 3, CHECK_NULL); 4527 values_h = typeArrayHandle(THREAD, r); 4528 values_h->int_at_put(0, java_lang_Thread::SLEEPING); 4529 values_h->int_at_put(1, java_lang_Thread::IN_OBJECT_WAIT_TIMED); 4530 values_h->int_at_put(2, java_lang_Thread::PARKED_TIMED); 4531 break; 4532 } 4533 case JAVA_THREAD_STATE_TERMINATED : { 4534 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL); 4535 values_h = typeArrayHandle(THREAD, r); 4536 values_h->int_at_put(0, java_lang_Thread::TERMINATED); 4537 break; 4538 } 4539 default: 4540 // Unknown state - probably incompatible JDK version 4541 return NULL; 4542 } 4543 4544 return (jintArray) JNIHandles::make_local(env, values_h()); 4545 } 4546 JVM_END 4547 4548 4549 JVM_ENTRY(jobjectArray, JVM_GetThreadStateNames(JNIEnv* env, 4550 jint javaThreadState, 4551 jintArray values)) 4552 { 4553 // If new thread states are added in future JDK and VM versions, 4554 // this should check if the JDK version is compatible with thread 4555 // states supported by the VM. Return NULL if not compatible. 4556 // 4557 // This function must map the VM java_lang_Thread::ThreadStatus 4558 // to the Java thread state that the JDK supports. 4559 // 4560 4561 ResourceMark rm; 4562 4563 // Check if threads is null 4564 if (values == NULL) { 4565 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 4566 } 4567 4568 typeArrayOop v = typeArrayOop(JNIHandles::resolve_non_null(values)); 4569 typeArrayHandle values_h(THREAD, v); 4570 4571 objArrayHandle names_h; 4572 switch (javaThreadState) { 4573 case JAVA_THREAD_STATE_NEW : { 4574 assert(values_h->length() == 1 && 4575 values_h->int_at(0) == java_lang_Thread::NEW, 4576 "Invalid threadStatus value"); 4577 4578 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 4579 1, /* only 1 substate */ 4580 CHECK_NULL); 4581 names_h = objArrayHandle(THREAD, r); 4582 Handle name = java_lang_String::create_from_str("NEW", CHECK_NULL); 4583 names_h->obj_at_put(0, name()); 4584 break; 4585 } 4586 case JAVA_THREAD_STATE_RUNNABLE : { 4587 assert(values_h->length() == 1 && 4588 values_h->int_at(0) == java_lang_Thread::RUNNABLE, 4589 "Invalid threadStatus value"); 4590 4591 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 4592 1, /* only 1 substate */ 4593 CHECK_NULL); 4594 names_h = objArrayHandle(THREAD, r); 4595 Handle name = java_lang_String::create_from_str("RUNNABLE", CHECK_NULL); 4596 names_h->obj_at_put(0, name()); 4597 break; 4598 } 4599 case JAVA_THREAD_STATE_BLOCKED : { 4600 assert(values_h->length() == 1 && 4601 values_h->int_at(0) == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER, 4602 "Invalid threadStatus value"); 4603 4604 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 4605 1, /* only 1 substate */ 4606 CHECK_NULL); 4607 names_h = objArrayHandle(THREAD, r); 4608 Handle name = java_lang_String::create_from_str("BLOCKED", CHECK_NULL); 4609 names_h->obj_at_put(0, name()); 4610 break; 4611 } 4612 case JAVA_THREAD_STATE_WAITING : { 4613 assert(values_h->length() == 2 && 4614 values_h->int_at(0) == java_lang_Thread::IN_OBJECT_WAIT && 4615 values_h->int_at(1) == java_lang_Thread::PARKED, 4616 "Invalid threadStatus value"); 4617 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 4618 2, /* number of substates */ 4619 CHECK_NULL); 4620 names_h = objArrayHandle(THREAD, r); 4621 Handle name0 = java_lang_String::create_from_str("WAITING.OBJECT_WAIT", 4622 CHECK_NULL); 4623 Handle name1 = java_lang_String::create_from_str("WAITING.PARKED", 4624 CHECK_NULL); 4625 names_h->obj_at_put(0, name0()); 4626 names_h->obj_at_put(1, name1()); 4627 break; 4628 } 4629 case JAVA_THREAD_STATE_TIMED_WAITING : { 4630 assert(values_h->length() == 3 && 4631 values_h->int_at(0) == java_lang_Thread::SLEEPING && 4632 values_h->int_at(1) == java_lang_Thread::IN_OBJECT_WAIT_TIMED && 4633 values_h->int_at(2) == java_lang_Thread::PARKED_TIMED, 4634 "Invalid threadStatus value"); 4635 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 4636 3, /* number of substates */ 4637 CHECK_NULL); 4638 names_h = objArrayHandle(THREAD, r); 4639 Handle name0 = java_lang_String::create_from_str("TIMED_WAITING.SLEEPING", 4640 CHECK_NULL); 4641 Handle name1 = java_lang_String::create_from_str("TIMED_WAITING.OBJECT_WAIT", 4642 CHECK_NULL); 4643 Handle name2 = java_lang_String::create_from_str("TIMED_WAITING.PARKED", 4644 CHECK_NULL); 4645 names_h->obj_at_put(0, name0()); 4646 names_h->obj_at_put(1, name1()); 4647 names_h->obj_at_put(2, name2()); 4648 break; 4649 } 4650 case JAVA_THREAD_STATE_TERMINATED : { 4651 assert(values_h->length() == 1 && 4652 values_h->int_at(0) == java_lang_Thread::TERMINATED, 4653 "Invalid threadStatus value"); 4654 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 4655 1, /* only 1 substate */ 4656 CHECK_NULL); 4657 names_h = objArrayHandle(THREAD, r); 4658 Handle name = java_lang_String::create_from_str("TERMINATED", CHECK_NULL); 4659 names_h->obj_at_put(0, name()); 4660 break; 4661 } 4662 default: 4663 // Unknown state - probably incompatible JDK version 4664 return NULL; 4665 } 4666 return (jobjectArray) JNIHandles::make_local(env, names_h()); 4667 } 4668 JVM_END 4669 4670 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 4671 { 4672 memset(info, 0, info_size); 4673 4674 info->jvm_version = Abstract_VM_Version::jvm_version(); 4675 info->update_version = 0; /* 0 in HotSpot Express VM */ 4676 info->special_update_version = 0; /* 0 in HotSpot Express VM */ 4677 4678 // when we add a new capability in the jvm_version_info struct, we should also 4679 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 4680 // counter defined in runtimeService.cpp. 4681 info->is_attachable = AttachListener::is_attach_supported(); 4682 } 4683 JVM_END