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