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