Old src/share/vm/prims/jvm.cpp (original) (raw)

1 /* 2 * Copyright (c) 1997, 2015, 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.inline.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "gc/shared/barrierSet.inline.hpp" 33 #include "gc/shared/collectedHeap.inline.hpp" 34 #include "interpreter/bytecode.hpp" 35 #include "memory/oopFactory.hpp" 36 #include "memory/universe.inline.hpp" 37 #include "oops/fieldStreams.hpp" 38 #include "oops/instanceKlass.hpp" 39 #include "oops/method.hpp" 40 #include "oops/objArrayKlass.hpp" 41 #include "oops/objArrayOop.inline.hpp" 42 #include "oops/oop.inline.hpp" 43 #include "prims/jvm.h" 44 #include "prims/jvm_misc.hpp" 45 #include "prims/jvmtiExport.hpp" 46 #include "prims/jvmtiThreadState.hpp" 47 #include "prims/nativeLookup.hpp" 48 #include "prims/privilegedStack.hpp" 49 #include "runtime/arguments.hpp" 50 #include "runtime/atomic.inline.hpp" 51 #include "runtime/handles.inline.hpp" 52 #include "runtime/init.hpp" 53 #include "runtime/interfaceSupport.hpp" 54 #include "runtime/java.hpp" 55 #include "runtime/javaCalls.hpp" 56 #include "runtime/jfieldIDWorkaround.hpp" 57 #include "runtime/orderAccess.inline.hpp" 58 #include "runtime/os.inline.hpp" 59 #include "runtime/perfData.hpp" 60 #include "runtime/reflection.hpp" 61 #include "runtime/thread.inline.hpp" 62 #include "runtime/vframe.hpp" 63 #include "runtime/vm_operations.hpp" 64 #include "runtime/vm_version.hpp" 65 #include "services/attachListener.hpp" 66 #include "services/management.hpp" 67 #include "services/threadService.hpp" 68 #include "trace/tracing.hpp" 69 #include "utilities/copy.hpp" 70 #include "utilities/defaultStream.hpp" 71 #include "utilities/dtrace.hpp" 72 #include "utilities/events.hpp" 73 #include "utilities/histogram.hpp" 74 #include "utilities/macros.hpp" 75 #include "utilities/top.hpp" 76 #include "utilities/utf8.hpp" 77 #if INCLUDE_CDS 78 #include "classfile/sharedClassUtil.hpp" 79 #include "classfile/systemDictionaryShared.hpp" 80 #endif 81 #ifdef TARGET_OS_FAMILY_linux 82 # include "jvm_linux.h" 83 #endif 84 #ifdef TARGET_OS_FAMILY_solaris 85 # include "jvm_solaris.h" 86 #endif 87 #ifdef TARGET_OS_FAMILY_windows 88 # include "jvm_windows.h" 89 #endif 90 #ifdef TARGET_OS_FAMILY_aix 91 # include "jvm_aix.h" 92 #endif 93 #ifdef TARGET_OS_FAMILY_bsd 94 # include "jvm_bsd.h" 95 #endif 96 97 #include <errno.h> 98 99 / 100 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 101 such ctors and calls MUST NOT come between an oop declaration/init and its 102 usage because if objects are move this may cause various memory stomps, bus 103 errors and segfaults. Here is a cookbook for causing so called "naked oop 104 failures": 105 106 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields { 107 JVMWrapper("JVM_GetClassDeclaredFields"); 108 109 // Object address to be held directly in mirror & not visible to GC 110 oop mirror = JNIHandles::resolve_non_null(ofClass); 111 112 // If this ctor can hit a safepoint, moving objects around, then 113 ComplexConstructor foo; 114 115 // Boom! mirror may point to JUNK instead of the intended object 116 (some dereference of mirror) 117 118 // Here's another call that may block for GC, making mirror stale 119 MutexLocker ml(some_lock); 120 121 // And here's an initializer that can result in a stale oop 122 // all in one step. 123 oop o = call_that_can_throw_exception(TRAPS); 124 125 126 The solution is to keep the oop declaration BELOW the ctor or function 127 call that might cause a GC, do another resolve to reassign the oop, or 128 consider use of a Handle instead of an oop so there is immunity from object 129 motion. But note that the "QUICK" entries below do not have a handlemark 130 and thus can only support use of handles passed in. 131 / 132 133 static void trace_class_resolution_impl(Klass to_class, TRAPS) { 134 ResourceMark rm; 135 int line_number = -1; 136 const char * source_file = NULL; 137 const char * trace = "explicit"; 138 InstanceKlass* caller = NULL; 139 JavaThread* jthread = JavaThread::current(); 140 if (jthread->has_last_Java_frame()) { 141 vframeStream vfst(jthread); 142 143 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 144 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 145 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 146 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 147 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 148 149 Method* last_caller = NULL; 150 151 while (!vfst.at_end()) { 152 Method* m = vfst.method(); 153 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 154 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 155 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 156 break; 157 } 158 last_caller = m; 159 vfst.next(); 160 } 161 // if this is called from Class.forName0 and that is called from Class.forName, 162 // then print the caller of Class.forName. If this is Class.loadClass, then print 163 // that caller, otherwise keep quiet since this should be picked up elsewhere. 164 bool found_it = false; 165 if (!vfst.at_end() && 166 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 167 vfst.method()->name() == vmSymbols::forName0_name()) { 168 vfst.next(); 169 if (!vfst.at_end() && 170 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 171 vfst.method()->name() == vmSymbols::forName_name()) { 172 vfst.next(); 173 found_it = true; 174 } 175 } else if (last_caller != NULL && 176 last_caller->method_holder()->name() == 177 vmSymbols::java_lang_ClassLoader() && 178 (last_caller->name() == vmSymbols::loadClassInternal_name() || 179 last_caller->name() == vmSymbols::loadClass_name())) { 180 found_it = true; 181 } else if (!vfst.at_end()) { 182 if (vfst.method()->is_native()) { 183 // JNI call 184 found_it = true; 185 } 186 } 187 if (found_it && !vfst.at_end()) { 188 // found the caller 189 caller = vfst.method()->method_holder(); 190 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 191 if (line_number == -1) { 192 // show method name if it's a native method 193 trace = vfst.method()->name_and_sig_as_C_string(); 194 } 195 Symbol* s = caller->source_file_name(); 196 if (s != NULL) { 197 source_file = s->as_C_string(); 198 } 199 } 200 } 201 if (caller != NULL) { 202 if (to_class != caller) { 203 const char * from = caller->external_name(); 204 const char * to = to_class->external_name(); 205 // print in a single call to reduce interleaving between threads 206 if (source_file != NULL) { 207 tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace); 208 } else { 209 tty->print("RESOLVE %s %s (%s)\n", from, to, trace); 210 } 211 } 212 } 213 } 214 215 void trace_class_resolution(Klass* to_class) { 216 EXCEPTION_MARK; 217 trace_class_resolution_impl(to_class, THREAD); 218 if (HAS_PENDING_EXCEPTION) { 219 CLEAR_PENDING_EXCEPTION; 220 } 221 } 222 223 // Wrapper to trace JVM functions 224 225 #ifdef ASSERT 226 class JVMTraceWrapper : public StackObj { 227 public: 228 JVMTraceWrapper(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) { 229 if (TraceJVMCalls) { 230 va_list ap; 231 va_start(ap, format); 232 tty->print("JVM "); 233 tty->vprint_cr(format, ap); 234 va_end(ap); 235 } 236 } 237 }; 238 239 Histogram* JVMHistogram; 240 volatile jint JVMHistogram_lock = 0; 241 242 class JVMHistogramElement : public HistogramElement { 243 public: 244 JVMHistogramElement(const char* name); 245 }; 246 247 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 248 name = elementName; 249 uintx count = 0; 250 251 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 252 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 253 count +=1; 254 if ( (WarnOnStalledSpinLock > 0) 255 && (count % WarnOnStalledSpinLock == 0)) { 256 warning("JVMHistogram_lock seems to be stalled"); 257 } 258 } 259 } 260 261 if(JVMHistogram == NULL) 262 JVMHistogram = new Histogram("JVM Call Counts",100); 263 264 JVMHistogram->add_element(this); 265 Atomic::dec(&JVMHistogram_lock); 266 } 267 268 #define JVMCountWrapper(arg)
269 static JVMHistogramElement* e = new JVMHistogramElement(arg);
270 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 271 272 #define JVMWrapper(arg1) JVMCountWrapper(arg1); JVMTraceWrapper(arg1) 273 #define JVMWrapper2(arg1, arg2) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2) 274 #define JVMWrapper3(arg1, arg2, arg3) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3) 275 #define JVMWrapper4(arg1, arg2, arg3, arg4) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3, arg4) 276 #else 277 #define JVMWrapper(arg1) 278 #define JVMWrapper2(arg1, arg2) 279 #define JVMWrapper3(arg1, arg2, arg3) 280 #define JVMWrapper4(arg1, arg2, arg3, arg4) 281 #endif 282 283 284 // Interface version ///////////////////////////////////////////////////////////////////// 285 286 287 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 288 return JVM_INTERFACE_VERSION; 289 JVM_END 290 291 292 // java.lang.System ////////////////////////////////////////////////////////////////////// 293 294 295 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 296 JVMWrapper("JVM_CurrentTimeMillis"); 297 return os::javaTimeMillis(); 298 JVM_END 299 300 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv env, jclass ignored)) 301 JVMWrapper("JVM_NanoTime"); 302 return os::javaTimeNanos(); 303 JVM_END 304 305 // The function below is actually exposed by sun.misc.VM and not 306 // java.lang.System, but we choose to keep it here so that it stays next 307 // to JVM_CurrentTimeMillis and JVM_NanoTime 308 309 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 310 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 311 312 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv env, jclass ignored, jlong offset_secs)) 313 JVMWrapper("JVM_GetNanoTimeAdjustment"); 314 jlong seconds; 315 jlong nanos; 316 317 os::javaTimeSystemUTC(seconds, nanos); 318 319 // We're going to verify that the result can fit in a long. 320 // For that we need the difference in seconds between 'seconds' 321 // and 'offset_secs' to be such that: 322 // |seconds - offset_secs| < (2^63/10^9) 323 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 324 // which makes |seconds - offset_secs| < 2^33 325 // and we will prefer +/- 2^32 as the maximum acceptable diff 326 // as 2^32 has a more natural feel than 2^33... 327 // 328 // So if |seconds - offset_secs| >= 2^32 - we return a special 329 // sentinel value (-1) which the caller should take as an 330 // exception value indicating that the offset given to us is 331 // too far from range of the current time - leading to too big 332 // a nano adjustment. The caller is expected to recover by 333 // computing a more accurate offset and calling this method 334 // again. (For the record 2^32 secs is ~136 years, so that 335 // should rarely happen) 336 // 337 jlong diff = seconds - offset_secs; 338 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 339 return -1; // sentinel value: the offset is too far off the target 340 } 341 342 // return the adjustment. If you compute a time by adding 343 // this number of nanoseconds along with the number of seconds 344 // in the offset you should get the current UTC time. 345 return (diff * (jlong)1000000000) + nanos; 346 JVM_END 347 348 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 349 jobject dst, jint dst_pos, jint length)) 350 JVMWrapper("JVM_ArrayCopy"); 351 // Check if we have null pointers 352 if (src == NULL || dst == NULL) { 353 THROW(vmSymbols::java_lang_NullPointerException()); 354 } 355 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 356 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 357 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop"); 358 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop"); 359 // Do copy 360 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 361 JVM_END 362 363 364 static void set_property(Handle props, const char key, const char value, TRAPS) { 365 JavaValue r(T_OBJECT); 366 // public synchronized Object put(Object key, Object value); 367 HandleMark hm(THREAD); 368 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 369 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 370 JavaCalls::call_virtual(&r, 371 props, 372 KlassHandle(THREAD, SystemDictionary::Properties_klass()), 373 vmSymbols::put_name(), 374 vmSymbols::object_object_object_signature(), 375 key_str, 376 value_str, 377 THREAD); 378 } 379 380 381 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK
(properties)); 382 383 384 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv env, jobject properties)) 385 JVMWrapper("JVM_InitProperties"); 386 ResourceMark rm; 387 388 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 389 390 // System property list includes both user set via -D option and 391 // jvm system specific properties. 392 for (SystemProperty p = Arguments::system_properties(); p != NULL; p = p->next()) { 393 PUTPROP(props, p->key(), p->value()); 394 } 395 396 // Convert the -XX:MaxDirectMemorySize= command line flag 397 // to the sun.nio.MaxDirectMemorySize property. 398 // Do this after setting user properties to prevent people 399 // from setting the value with a -D option, as requested. 400 { 401 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 402 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 403 } else { 404 char as_chars[256]; 405 jio_snprintf(as_chars, sizeof(as_chars), SIZE_FORMAT, MaxDirectMemorySize); 406 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 407 } 408 } 409 410 // JVM monitoring and management support 411 // Add the sun.management.compiler property for the compiler's name 412 { 413 #undef CSIZE 414 #if defined(_LP64) || defined(_WIN64) 415 #define CSIZE "64-Bit " 416 #else 417 #define CSIZE 418 #endif // 64bit 419 420 #ifdef TIERED 421 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 422 #else 423 #if defined(COMPILER1) 424 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 425 #elif defined(COMPILER2) 426 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 427 #elif INCLUDE_JVMCI 428 #error "INCLUDE_JVMCI should imply TIERED" 429 #else 430 const char* compiler_name = ""; 431 #endif // compilers 432 #endif // TIERED 433 434 if (compiler_name != '\0' && 435 (Arguments::mode() != Arguments::_int)) { 436 PUTPROP(props, "sun.management.compiler", compiler_name); 437 } 438 } 439 440 return properties; 441 JVM_END 442 443 444 / 445 * Return the temporary directory that the VM uses for the attach 446 * and perf data files. 447 * 448 * It is important that this directory is well-known and the 449 * same for all VM instances. It cannot be affected by configuration 450 * variables such as java.io.tmpdir. 451 / 452 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv env)) 453 JVMWrapper("JVM_GetTemporaryDirectory"); 454 HandleMark hm(THREAD); 455 const char temp_dir = os::get_temp_directory(); 456 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 457 return (jstring) JNIHandles::make_local(env, h()); 458 JVM_END 459 460 461 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 462 463 extern volatile jint vm_created; 464 465 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 466 before_exit(thread); 467 vm_exit(code); 468 JVM_END 469 470 471 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 472 JVMWrapper("JVM_GC"); 473 if (!DisableExplicitGC) { 474 Universe::heap()->collect(GCCause::_java_lang_system_gc); 475 } 476 JVM_END 477 478 479 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 480 JVMWrapper("JVM_MaxObjectInspectionAge"); 481 return Universe::heap()->millis_since_last_gc(); 482 JVM_END 483 484 485 static inline jlong convert_size_t_to_jlong(size_t val) { 486 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 487 NOT_LP64 (return (jlong)val;) 488 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 489 } 490 491 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 492 JVMWrapper("JVM_TotalMemory"); 493 size_t n = Universe::heap()->capacity(); 494 return convert_size_t_to_jlong(n); 495 JVM_END 496 497 498 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 499 JVMWrapper("JVM_FreeMemory"); 500 CollectedHeap ch = Universe::heap(); 501 size_t n; 502 { 503 MutexLocker x(Heap_lock); 504 n = ch->capacity() - ch->used(); 505 } 506 return convert_size_t_to_jlong(n); 507 JVM_END 508 509 510 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 511 JVMWrapper("JVM_MaxMemory"); 512 size_t n = Universe::heap()->max_capacity(); 513 return convert_size_t_to_jlong(n); 514 JVM_END 515 516 517 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 518 JVMWrapper("JVM_ActiveProcessorCount"); 519 return os::active_processor_count(); 520 JVM_END 521 522 523 524 // java.lang.Throwable ////////////////////////////////////////////////////// 525 526 527 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv env, jobject receiver)) 528 JVMWrapper("JVM_FillInStackTrace"); 529 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 530 java_lang_Throwable::fill_in_stack_trace(exception); 531 JVM_END 532 533 534 JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv env, jobject throwable)) 535 JVMWrapper("JVM_GetStackTraceDepth"); 536 oop exception = JNIHandles::resolve(throwable); 537 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD); 538 JVM_END 539 540 541 JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv env, jobject throwable, jint index)) 542 JVMWrapper("JVM_GetStackTraceElement"); 543 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC 544 oop exception = JNIHandles::resolve(throwable); 545 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL); 546 return JNIHandles::make_local(env, element); 547 JVM_END 548 549 550 // java.lang.Object /////////////////////////////////////////////// 551 552 553 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv env, jobject handle)) 554 JVMWrapper("JVM_IHashCode"); 555 // as implemented in the classic virtual machine; return 0 if object is NULL 556 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 557 JVM_END 558 559 560 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv env, jobject handle, jlong ms)) 561 JVMWrapper("JVM_MonitorWait"); 562 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 563 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 564 if (JvmtiExport::should_post_monitor_wait()) { 565 JvmtiExport::post_monitor_wait((JavaThread )THREAD, (oop)obj(), ms); 566 567 // The current thread already owns the monitor and it has not yet 568 // been added to the wait queue so the current thread cannot be 569 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 570 // event handler cannot accidentally consume an unpark() meant for 571 // the ParkEvent associated with this ObjectMonitor. 572 } 573 ObjectSynchronizer::wait(obj, ms, CHECK); 574 JVM_END 575 576 577 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv env, jobject handle)) 578 JVMWrapper("JVM_MonitorNotify"); 579 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 580 ObjectSynchronizer::notify(obj, CHECK); 581 JVM_END 582 583 584 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv env, jobject handle)) 585 JVMWrapper("JVM_MonitorNotifyAll"); 586 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 587 ObjectSynchronizer::notifyall(obj, CHECK); 588 JVM_END 589 590 591 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 592 JVMWrapper("JVM_Clone"); 593 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 594 const KlassHandle klass (THREAD, obj->klass()); 595 JvmtiVMObjectAllocEventCollector oam; 596 597 #ifdef ASSERT 598 // Just checking that the cloneable flag is set correct 599 if (obj->is_array()) { 600 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 601 } else { 602 guarantee(obj->is_instance(), "should be instanceOop"); 603 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 604 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 605 } 606 #endif 607 608 // Check if class of obj supports the Cloneable interface. 609 // All arrays are considered to be cloneable (See JLS 20.1.5) 610 if (!klass->is_cloneable()) { 611 ResourceMark rm(THREAD); 612 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 613 } 614 615 // Make shallow object copy 616 const int size = obj->size(); 617 oop new_obj_oop = NULL; 618 if (obj->is_array()) { 619 const int length = ((arrayOop)obj())->length(); 620 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 621 } else { 622 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 623 } 624 625 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread 626 // is modifying a reference field in the clonee, a non-oop-atomic copy might 627 // be suspended in the middle of copying the pointer and end up with parts 628 // of two different pointers in the field. Subsequent dereferences will crash. 629 // 4846409: an oop-copy of objects with long or double fields or arrays of same 630 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead 631 // of oops. We know objects are aligned on a minimum of an jlong boundary. 632 // The same is true of StubRoutines::object_copy and the various oop_copy 633 // variants, and of the code generated by the inline_native_clone intrinsic. 634 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); 635 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop, 636 (size_t)align_object_size(size) / HeapWordsPerLong); 637 // Clear the header 638 new_obj_oop->init_mark(); 639 640 // Store check (mark entire object and let gc sort it out) 641 BarrierSet* bs = Universe::heap()->barrier_set(); 642 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); 643 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); 644 645 Handle new_obj(THREAD, new_obj_oop); 646 // Special handling for MemberNames. Since they contain Method* metadata, they 647 // must be registered so that RedefineClasses can fix metadata contained in them. 648 if (java_lang_invoke_MemberName::is_instance(new_obj()) && 649 java_lang_invoke_MemberName::is_method(new_obj())) { 650 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj()); 651 // MemberName may be unresolved, so doesn't need registration until resolved. 652 if (method != NULL) { 653 methodHandle m(THREAD, method); 654 // This can safepoint and redefine method, so need both new_obj and method 655 // in a handle, for two different reasons. new_obj can move, method can be 656 // deleted if nothing is using it on the stack. 657 m->method_holder()->add_member_name(new_obj()); 658 } 659 } 660 661 // Caution: this involves a java upcall, so the clone should be 662 // "gc-robust" by this stage. 663 if (klass->has_finalizer()) { 664 assert(obj->is_instance(), "should be instanceOop"); 665 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 666 new_obj = Handle(THREAD, new_obj_oop); 667 } 668 669 return JNIHandles::make_local(env, new_obj()); 670 JVM_END 671 672 // java.io.File /////////////////////////////////////////////////////////////// 673 674 JVM_LEAF(char*, JVM_NativePath(char* path)) 675 JVMWrapper2("JVM_NativePath (%s)", path); 676 return os::native_path(path); 677 JVM_END 678 679 680 // Misc. class handling /////////////////////////////////////////////////////////// 681 682 683 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 684 JVMWrapper("JVM_GetCallerClass"); 685 686 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 687 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 688 // temporarily for existing code to use until a replacement API is defined. 689 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 690 Klass* k = thread->security_get_caller_class(depth); 691 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 692 } 693 694 // Getting the class of the caller frame. 695 // 696 // The call stack at this point looks something like this: 697 // 698 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 699 // [1] [ @CallerSensitive API.method ] 700 // [.] [ (skipped intermediate frames) ] 701 // [n] [ caller ] 702 vframeStream vfst(thread); 703 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 704 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 705 Method* m = vfst.method(); 706 assert(m != NULL, "sanity"); 707 switch (n) { 708 case 0: 709 // This must only be called from Reflection.getCallerClass 710 if (m->intrinsic_id() != vmIntrinsics::getCallerClass) { 711 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 712 } 713 // fall-through 714 case 1: 715 // Frame 0 and 1 must be caller sensitive. 716 if (!m->caller_sensitive()) { 717 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 718 } 719 break; 720 default: 721 if (!m->is_ignored_by_security_stack_walk()) { 722 // We have reached the desired frame; return the holder class. 723 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 724 } 725 break; 726 } 727 } 728 return NULL; 729 JVM_END 730 731 732 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 733 JVMWrapper("JVM_FindPrimitiveClass"); 734 oop mirror = NULL; 735 BasicType t = name2type(utf); 736 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 737 mirror = Universe::java_mirror(t); 738 } 739 if (mirror == NULL) { 740 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 741 } else { 742 return (jclass) JNIHandles::make_local(env, mirror); 743 } 744 JVM_END 745 746 747 // Returns a class loaded by the bootstrap class loader; or null 748 // if not found. ClassNotFoundException is not thrown. 749 // FindClassFromBootLoader is exported to the launcher for windows. 750 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 751 const char* name)) 752 JVMWrapper2("JVM_FindClassFromBootLoader %s", name); 753 754 // Java libraries should ensure that name is never null... 755 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 756 // It's impossible to create this class; the name cannot fit 757 // into the constant pool. 758 return NULL; 759 } 760 761 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 762 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 763 if (k == NULL) { 764 return NULL; 765 } 766 767 if (TraceClassResolution) { 768 trace_class_resolution(k); 769 } 770 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 771 JVM_END 772 773 // Find a class with this name in this loader, using the caller's protection domain. 774 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 775 jboolean init, jobject loader, 776 jclass caller)) 777 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name); 778 // Java libraries should ensure that name is never null... 779 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 780 // It's impossible to create this class; the name cannot fit 781 // into the constant pool. 782 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 783 } 784 785 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 786 787 oop loader_oop = JNIHandles::resolve(loader); 788 oop from_class = JNIHandles::resolve(caller); 789 oop protection_domain = NULL; 790 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 791 // NPE. Put it in another way, the bootstrap class loader has all permission and 792 // thus no checkPackageAccess equivalence in the VM class loader. 793 // The caller is also passed as NULL by the java code if there is no security 794 // manager to avoid the performance cost of getting the calling class. 795 if (from_class != NULL && loader_oop != NULL) { 796 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 797 } 798 799 Handle h_loader(THREAD, loader_oop); 800 Handle h_prot(THREAD, protection_domain); 801 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 802 h_prot, false, THREAD); 803 804 if (TraceClassResolution && result != NULL) { 805 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 806 } 807 return result; 808 JVM_END 809 810 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv env, const char name, 811 jboolean init, jclass from)) 812 JVMWrapper2("JVM_FindClassFromClass %s", name); 813 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 814 // It's impossible to create this class; the name cannot fit 815 // into the constant pool. 816 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 817 } 818 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 819 oop from_class_oop = JNIHandles::resolve(from); 820 Klass from_class = (from_class_oop == NULL) 821 ? (Klass)NULL 822 : java_lang_Class::as_Klass(from_class_oop); 823 oop class_loader = NULL; 824 oop protection_domain = NULL; 825 if (from_class != NULL) { 826 class_loader = from_class->class_loader(); 827 protection_domain = from_class->protection_domain(); 828 } 829 Handle h_loader(THREAD, class_loader); 830 Handle h_prot (THREAD, protection_domain); 831 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 832 h_prot, true, thread); 833 834 if (TraceClassResolution && result != NULL) { 835 // this function is generally only used for class loading during verification. 836 ResourceMark rm; 837 oop from_mirror = JNIHandles::resolve_non_null(from); 838 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 839 const char * from_name = from_class->external_name(); 840 841 oop mirror = JNIHandles::resolve_non_null(result); 842 Klass* to_class = java_lang_Class::as_Klass(mirror); 843 const char * to = to_class->external_name(); 844 tty->print("RESOLVE %s %s (verification)\n", from_name, to); 845 } 846 847 return result; 848 JVM_END 849 850 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 851 if (loader.is_null()) { 852 return; 853 } 854 855 // check whether the current caller thread holds the lock or not. 856 // If not, increment the corresponding counter 857 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 858 ObjectSynchronizer::owner_self) { 859 counter->inc(); 860 } 861 } 862 863 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 864 // and JVM_DefineClassWithSourceCond() 865 static jclass jvm_define_class_common(JNIEnv env, const char name, 866 jobject loader, const jbyte buf, 867 jsize len, jobject pd, const char source, 868 jboolean verify, TRAPS) { 869 if (source == NULL) source = "JVM_DefineClass"; 870 871 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 872 JavaThread jt = (JavaThread) THREAD; 873 874 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 875 ClassLoader::perf_define_appclass_selftime(), 876 ClassLoader::perf_define_appclasses(), 877 jt->get_thread_stat()->perf_recursion_counts_addr(), 878 jt->get_thread_stat()->perf_timers_addr(), 879 PerfClassTraceTime::DEFINE_CLASS); 880 881 if (UsePerfData) { 882 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 883 } 884 885 // Since exceptions can be thrown, class initialization can take place 886 // if name is NULL no check for class name in .class stream has to be made. 887 TempNewSymbol class_name = NULL; 888 if (name != NULL) { 889 const int str_len = (int)strlen(name); 890 if (str_len > Symbol::max_length()) { 891 // It's impossible to create this class; the name cannot fit 892 // into the constant pool. 893 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 894 } 895 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 896 } 897 898 ResourceMark rm(THREAD); 899 ClassFileStream st((u1) buf, len, (char )source); 900 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 901 if (UsePerfData) { 902 is_lock_held_by_thread(class_loader, 903 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 904 THREAD); 905 } 906 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 907 Klass k = SystemDictionary::resolve_from_stream(class_name, class_loader, 908 protection_domain, &st, 909 verify != 0, 910 CHECK_NULL); 911 912 if (TraceClassResolution && k != NULL) { 913 trace_class_resolution(k); 914 } 915 916 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 917 } 918 919 920 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv env, const char name, jobject loader, const jbyte buf, jsize len, jobject pd)) 921 JVMWrapper2("JVM_DefineClass %s", name); 922 923 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD); 924 JVM_END 925 926 927 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv env, const char name, jobject loader, const jbyte buf, jsize len, jobject pd, const char source)) 928 JVMWrapper2("JVM_DefineClassWithSource %s", name); 929 930 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD); 931 JVM_END 932 933 JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv env, const char name, 934 jobject loader, const jbyte buf, 935 jsize len, jobject pd, 936 const char source, jboolean verify)) 937 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name); 938 939 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD); 940 JVM_END 941 942 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv env, jobject loader, jstring name)) 943 JVMWrapper("JVM_FindLoadedClass"); 944 ResourceMark rm(THREAD); 945 946 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 947 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 948 949 const char str = java_lang_String::as_utf8_string(string()); 950 // Sanity check, don't expect null 951 if (str == NULL) return NULL; 952 953 const int str_len = (int)strlen(str); 954 if (str_len > Symbol::max_length()) { 955 // It's impossible to create this class; the name cannot fit 956 // into the constant pool. 957 return NULL; 958 } 959 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 960 961 // Security Note: 962 // The Java level wrapper will perform the necessary security check allowing 963 // us to pass the NULL as the initiating class loader. 964 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 965 if (UsePerfData) { 966 is_lock_held_by_thread(h_loader, 967 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 968 THREAD); 969 } 970 971 Klass k = SystemDictionary::find_instance_or_array_klass(klass_name, 972 h_loader, 973 Handle(), 974 CHECK_NULL); 975 #if INCLUDE_CDS 976 if (k == NULL) { 977 // If the class is not already loaded, try to see if it's in the shared 978 // archive for the current classloader (h_loader). 979 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class( 980 klass_name, h_loader, CHECK_NULL); 981 k = ik(); 982 } 983 #endif 984 return (k == NULL) ? NULL : 985 (jclass) JNIHandles::make_local(env, k->java_mirror()); 986 JVM_END 987 988 989 // Reflection support ////////////////////////////////////////////////////////////////////////////// 990 991 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv env, jclass cls)) 992 assert (cls != NULL, "illegal class"); 993 JVMWrapper("JVM_GetClassName"); 994 JvmtiVMObjectAllocEventCollector oam; 995 ResourceMark rm(THREAD); 996 const char name; 997 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 998 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 999 } else { 1000 // Consider caching interned string in Klass 1001 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1002 assert(k->is_klass(), "just checking"); 1003 name = k->external_name(); 1004 } 1005 oop result = StringTable::intern((char) name, CHECK_NULL); 1006 return (jstring) JNIHandles::make_local(env, result); 1007 JVM_END 1008 1009 1010 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv env, jclass cls)) 1011 JVMWrapper("JVM_GetClassInterfaces"); 1012 JvmtiVMObjectAllocEventCollector oam; 1013 oop mirror = JNIHandles::resolve_non_null(cls); 1014 1015 // Special handling for primitive objects 1016 if (java_lang_Class::is_primitive(mirror)) { 1017 // Primitive objects does not have any interfaces 1018 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1019 return (jobjectArray) JNIHandles::make_local(env, r); 1020 } 1021 1022 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror)); 1023 // Figure size of result array 1024 int size; 1025 if (klass->oop_is_instance()) { 1026 size = InstanceKlass::cast(klass())->local_interfaces()->length(); 1027 } else { 1028 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass"); 1029 size = 2; 1030 } 1031 1032 // Allocate result array 1033 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1034 objArrayHandle result (THREAD, r); 1035 // Fill in result 1036 if (klass->oop_is_instance()) { 1037 // Regular instance klass, fill in all local interfaces 1038 for (int index = 0; index < size; index++) { 1039 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index); 1040 result->obj_at_put(index, k->java_mirror()); 1041 } 1042 } else { 1043 // All arrays implement java.lang.Cloneable and java.io.Serializable 1044 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1045 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1046 } 1047 return (jobjectArray) JNIHandles::make_local(env, result()); 1048 JVM_END 1049 1050 1051 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv env, jclass cls)) 1052 JVMWrapper("JVM_IsInterface"); 1053 oop mirror = JNIHandles::resolve_non_null(cls); 1054 if (java_lang_Class::is_primitive(mirror)) { 1055 return JNI_FALSE; 1056 } 1057 Klass k = java_lang_Class::as_Klass(mirror); 1058 jboolean result = k->is_interface(); 1059 assert(!result || k->oop_is_instance(), 1060 "all interfaces are instance types"); 1061 // The compiler intrinsic for isInterface tests the 1062 // Klass::access_flags bits in the same way. 1063 return result; 1064 JVM_END 1065 1066 1067 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv env, jclass cls)) 1068 JVMWrapper("JVM_GetClassSigners"); 1069 JvmtiVMObjectAllocEventCollector oam; 1070 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1071 // There are no signers for primitive types 1072 return NULL; 1073 } 1074 1075 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1076 1077 // If there are no signers set in the class, or if the class 1078 // is an array, return NULL. 1079 if (signers == NULL) return NULL; 1080 1081 // copy of the signers array 1082 Klass element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1083 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1084 for (int index = 0; index < signers->length(); index++) { 1085 signers_copy->obj_at_put(index, signers->obj_at(index)); 1086 } 1087 1088 // return the copy 1089 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1090 JVM_END 1091 1092 1093 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv env, jclass cls, jobjectArray signers)) 1094 JVMWrapper("JVM_SetClassSigners"); 1095 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1096 // This call is ignored for primitive types and arrays. 1097 // Signers are only set once, ClassLoader.java, and thus shouldn't 1098 // be called with an array. Only the bootstrap loader creates arrays. 1099 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1100 if (k->oop_is_instance()) { 1101 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1102 } 1103 } 1104 JVM_END 1105 1106 1107 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1108 JVMWrapper("JVM_GetProtectionDomain"); 1109 if (JNIHandles::resolve(cls) == NULL) { 1110 THROW(vmSymbols::java_lang_NullPointerException(), NULL); 1111 } 1112 1113 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1114 // Primitive types does not have a protection domain. 1115 return NULL; 1116 } 1117 1118 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1119 return (jobject) JNIHandles::make_local(env, pd); 1120 JVM_END 1121 1122 1123 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) { 1124 // If there is a security manager and protection domain, check the access 1125 // in the protection domain, otherwise it is authorized. 1126 if (java_lang_System::has_security_manager()) { 1127 1128 // For bootstrapping, if pd implies method isn't in the JDK, allow 1129 // this context to revert to older behavior. 1130 // In this case the isAuthorized field in AccessControlContext is also not 1131 // present. 1132 if (Universe::protection_domain_implies_method() == NULL) { 1133 return true; 1134 } 1135 1136 // Whitelist certain access control contexts 1137 if (java_security_AccessControlContext::is_authorized(context)) { 1138 return true; 1139 } 1140 1141 oop prot = klass->protection_domain(); 1142 if (prot != NULL) { 1143 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1144 // in the new wrapper. 1145 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1146 Handle h_prot(THREAD, prot); 1147 JavaValue result(T_BOOLEAN); 1148 JavaCallArguments args(h_prot); 1149 JavaCalls::call(&result, m, &args, CHECK_false); 1150 return (result.get_jboolean() != 0); 1151 } 1152 } 1153 return true; 1154 } 1155 1156 // Create an AccessControlContext with a protection domain with null codesource 1157 // and null permissions - which gives no permissions. 1158 oop create_dummy_access_control_context(TRAPS) { 1159 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1160 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1161 // Call constructor ProtectionDomain(null, null); 1162 JavaValue result(T_VOID); 1163 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass), 1164 vmSymbols::object_initializer_name(), 1165 vmSymbols::codesource_permissioncollection_signature(), 1166 Handle(), Handle(), CHECK_NULL); 1167 1168 // new ProtectionDomain[] {pd}; 1169 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1170 context->obj_at_put(0, obj()); 1171 1172 // new AccessControlContext(new ProtectionDomain[] {pd}) 1173 objArrayHandle h_context(THREAD, context); 1174 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1175 return acc; 1176 } 1177 1178 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1179 JVMWrapper("JVM_DoPrivileged"); 1180 1181 if (action == NULL) { 1182 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1183 } 1184 1185 // Compute the frame initiating the do privileged operation and setup the privileged stack 1186 vframeStream vfst(thread); 1187 vfst.security_get_caller_frame(1); 1188 1189 if (vfst.at_end()) { 1190 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1191 } 1192 1193 Method method = vfst.method(); 1194 instanceKlassHandle klass (THREAD, method->method_holder()); 1195 1196 // Check that action object understands "Object run()" 1197 Handle h_context; 1198 if (context != NULL) { 1199 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1200 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1201 if (!authorized) { 1202 // Create an unprivileged access control object and call it's run function 1203 // instead. 1204 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1205 h_context = Handle(THREAD, noprivs); 1206 } 1207 } 1208 1209 // Check that action object understands "Object run()" 1210 Handle object (THREAD, JNIHandles::resolve(action)); 1211 1212 // get run() method 1213 Method m_oop = object->klass()->uncached_lookup_method( 1214 vmSymbols::run_method_name(), 1215 vmSymbols::void_object_signature(), 1216 Klass::find_overpass); 1217 methodHandle m (THREAD, m_oop); 1218 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { 1219 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1220 } 1221 1222 // Stack allocated list of privileged stack elements 1223 PrivilegedElement pi; 1224 if (!vfst.at_end()) { 1225 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1226 thread->set_privileged_stack_top(&pi); 1227 } 1228 1229 1230 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1231 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1232 Handle pending_exception; 1233 JavaValue result(T_OBJECT); 1234 JavaCallArguments args(object); 1235 JavaCalls::call(&result, m, &args, THREAD); 1236 1237 // done with action, remove ourselves from the list 1238 if (!vfst.at_end()) { 1239 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1240 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1241 } 1242 1243 if (HAS_PENDING_EXCEPTION) { 1244 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1245 CLEAR_PENDING_EXCEPTION; 1246 // JVMTI has already reported the pending exception 1247 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1248 if (THREAD->is_Java_thread()) { 1249 JvmtiExport::clear_detected_exception((JavaThread) THREAD); 1250 } 1251 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1252 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1253 // Throw a java.security.PrivilegedActionException(Exception e) exception 1254 JavaCallArguments args(pending_exception); 1255 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1256 vmSymbols::exception_void_signature(), 1257 &args); 1258 } 1259 } 1260 1261 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1262 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1263 JVM_END 1264 1265 1266 // Returns the inherited_access_control_context field of the running thread. 1267 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv env, jclass cls)) 1268 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1269 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1270 return JNIHandles::make_local(env, result); 1271 JVM_END 1272 1273 class RegisterArrayForGC { 1274 private: 1275 JavaThread _thread; 1276 public: 1277 RegisterArrayForGC(JavaThread thread, GrowableArray array) { 1278 _thread = thread; 1279 _thread->register_array_for_gc(array); 1280 } 1281 1282 ~RegisterArrayForGC() { 1283 _thread->register_array_for_gc(NULL); 1284 } 1285 }; 1286 1287 1288 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv env, jclass cls)) 1289 JVMWrapper("JVM_GetStackAccessControlContext"); 1290 if (!UsePrivilegedStack) return NULL; 1291 1292 ResourceMark rm(THREAD); 1293 GrowableArray local_array = new GrowableArray(12); 1294 JvmtiVMObjectAllocEventCollector oam; 1295 1296 // count the protection domains on the execution stack. We collapse 1297 // duplicate consecutive protection domains into a single one, as 1298 // well as stopping when we hit a privileged frame. 1299 1300 // Use vframeStream to iterate through Java frames 1301 vframeStream vfst(thread); 1302 1303 oop previous_protection_domain = NULL; 1304 Handle privileged_context(thread, NULL); 1305 bool is_privileged = false; 1306 oop protection_domain = NULL; 1307 1308 for(; !vfst.at_end(); vfst.next()) { 1309 // get method of frame 1310 Method method = vfst.method(); 1311 intptr_t frame_id = vfst.frame_id(); 1312 1313 // check the privileged frames to see if we have a match 1314 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1315 // this frame is privileged 1316 is_privileged = true; 1317 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1318 protection_domain = thread->privileged_stack_top()->protection_domain(); 1319 } else { 1320 protection_domain = method->method_holder()->protection_domain(); 1321 } 1322 1323 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1324 local_array->push(protection_domain); 1325 previous_protection_domain = protection_domain; 1326 } 1327 1328 if (is_privileged) break; 1329 } 1330 1331 1332 // either all the domains on the stack were system domains, or 1333 // we had a privileged system domain 1334 if (local_array->is_empty()) { 1335 if (is_privileged && privileged_context.is_null()) return NULL; 1336 1337 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1338 return JNIHandles::make_local(env, result); 1339 } 1340 1341 // the resource area must be registered in case of a gc 1342 RegisterArrayForGC ragc(thread, local_array); 1343 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1344 local_array->length(), CHECK_NULL); 1345 objArrayHandle h_context(thread, context); 1346 for (int index = 0; index < local_array->length(); index++) { 1347 h_context->obj_at_put(index, local_array->at(index)); 1348 } 1349 1350 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1351 1352 return JNIHandles::make_local(env, result); 1353 JVM_END 1354 1355 1356 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv env, jclass cls)) 1357 JVMWrapper("JVM_IsArrayClass"); 1358 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1359 return (k != NULL) && k->oop_is_array() ? true : false; 1360 JVM_END 1361 1362 1363 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv env, jclass cls)) 1364 JVMWrapper("JVM_IsPrimitiveClass"); 1365 oop mirror = JNIHandles::resolve_non_null(cls); 1366 return (jboolean) java_lang_Class::is_primitive(mirror); 1367 JVM_END 1368 1369 1370 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv env, jclass cls)) 1371 JVMWrapper("JVM_GetClassModifiers"); 1372 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1373 // Primitive type 1374 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1375 } 1376 1377 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1378 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1379 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1380 return k->modifier_flags(); 1381 JVM_END 1382 1383 1384 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1385 1386 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv env, jclass ofClass)) 1387 JvmtiVMObjectAllocEventCollector oam; 1388 // ofClass is a reference to a java_lang_Class object. The mirror object 1389 // of an InstanceKlass 1390 1391 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1392 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1393 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1394 return (jobjectArray)JNIHandles::make_local(env, result); 1395 } 1396 1397 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1398 InnerClassesIterator iter(k); 1399 1400 if (iter.length() == 0) { 1401 // Neither an inner nor outer class 1402 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1403 return (jobjectArray)JNIHandles::make_local(env, result); 1404 } 1405 1406 // find inner class info 1407 constantPoolHandle cp(thread, k->constants()); 1408 int length = iter.length(); 1409 1410 // Allocate temp. result array 1411 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1412 objArrayHandle result (THREAD, r); 1413 int members = 0; 1414 1415 for (; !iter.done(); iter.next()) { 1416 int ioff = iter.inner_class_info_index(); 1417 int ooff = iter.outer_class_info_index(); 1418 1419 if (ioff != 0 && ooff != 0) { 1420 // Check to see if the name matches the class we're looking for 1421 // before attempting to find the class. 1422 if (cp->klass_name_at_matches(k, ooff)) { 1423 Klass outer_klass = cp->klass_at(ooff, CHECK_NULL); 1424 if (outer_klass == k()) { 1425 Klass ik = cp->klass_at(ioff, CHECK_NULL); 1426 instanceKlassHandle inner_klass (THREAD, ik); 1427 1428 // Throws an exception if outer klass has not declared k as 1429 // an inner klass 1430 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1431 1432 result->obj_at_put(members, inner_klass->java_mirror()); 1433 members++; 1434 } 1435 } 1436 } 1437 } 1438 1439 if (members != length) { 1440 // Return array of right length 1441 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1442 for(int i = 0; i < members; i++) { 1443 res->obj_at_put(i, result->obj_at(i)); 1444 } 1445 return (jobjectArray)JNIHandles::make_local(env, res); 1446 } 1447 1448 return (jobjectArray)JNIHandles::make_local(env, result()); 1449 JVM_END 1450 1451 1452 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv env, jclass ofClass)) 1453 { 1454 // ofClass is a reference to a java_lang_Class object. 1455 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1456 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1457 return NULL; 1458 } 1459 1460 bool inner_is_member = false; 1461 Klass outer_klass 1462 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1463 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1464 if (outer_klass == NULL) return NULL; // already a top-level class 1465 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1466 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1467 } 1468 JVM_END 1469 1470 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv env, jclass cls)) 1471 { 1472 oop mirror = JNIHandles::resolve_non_null(cls); 1473 if (java_lang_Class::is_primitive(mirror) || 1474 !java_lang_Class::as_Klass(mirror)->oop_is_instance()) { 1475 return NULL; 1476 } 1477 instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror))); 1478 int ooff = 0, noff = 0; 1479 if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) { 1480 if (noff != 0) { 1481 constantPoolHandle i_cp(thread, k->constants()); 1482 Symbol name = i_cp->symbol_at(noff); 1483 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1484 return (jstring) JNIHandles::make_local(env, str()); 1485 } 1486 } 1487 return NULL; 1488 } 1489 JVM_END 1490 1491 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv env, jclass cls)) 1492 assert (cls != NULL, "illegal class"); 1493 JVMWrapper("JVM_GetClassSignature"); 1494 JvmtiVMObjectAllocEventCollector oam; 1495 ResourceMark rm(THREAD); 1496 // Return null for arrays and primatives 1497 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1498 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1499 if (k->oop_is_instance()) { 1500 Symbol sym = InstanceKlass::cast(k)->generic_signature(); 1501 if (sym == NULL) return NULL; 1502 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1503 return (jstring) JNIHandles::make_local(env, str()); 1504 } 1505 } 1506 return NULL; 1507 JVM_END 1508 1509 1510 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv env, jclass cls)) 1511 assert (cls != NULL, "illegal class"); 1512 JVMWrapper("JVM_GetClassAnnotations"); 1513 1514 // Return null for arrays and primitives 1515 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1516 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1517 if (k->oop_is_instance()) { 1518 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1519 return (jbyteArray) JNIHandles::make_local(env, a); 1520 } 1521 } 1522 return NULL; 1523 JVM_END 1524 1525 1526 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1527 // some of this code was adapted from from jni_FromReflectedField 1528 1529 oop reflected = JNIHandles::resolve_non_null(field); 1530 oop mirror = java_lang_reflect_Field::clazz(reflected); 1531 Klass k = java_lang_Class::as_Klass(mirror); 1532 int slot = java_lang_reflect_Field::slot(reflected); 1533 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1534 1535 KlassHandle kh(THREAD, k); 1536 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot); 1537 1538 if (modifiers & JVM_ACC_STATIC) { 1539 // for static fields we only look in the current class 1540 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) { 1541 assert(false, "cannot find static field"); 1542 return false; 1543 } 1544 } else { 1545 // for instance fields we start with the current class and work 1546 // our way up through the superclass chain 1547 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) { 1548 assert(false, "cannot find instance field"); 1549 return false; 1550 } 1551 } 1552 return true; 1553 } 1554 1555 static Method jvm_get_method_common(jobject method) { 1556 // some of this code was adapted from from jni_FromReflectedMethod 1557 1558 oop reflected = JNIHandles::resolve_non_null(method); 1559 oop mirror = NULL; 1560 int slot = 0; 1561 1562 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1563 mirror = java_lang_reflect_Constructor::clazz(reflected); 1564 slot = java_lang_reflect_Constructor::slot(reflected); 1565 } else { 1566 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1567 "wrong type"); 1568 mirror = java_lang_reflect_Method::clazz(reflected); 1569 slot = java_lang_reflect_Method::slot(reflected); 1570 } 1571 Klass k = java_lang_Class::as_Klass(mirror); 1572 1573 Method m = InstanceKlass::cast(k)->method_with_idnum(slot); 1574 assert(m != NULL, "cannot find method"); 1575 return m; // caller has to deal with NULL in product mode 1576 } 1577 1578 / Type use annotations support (JDK 1.8) / 1579 1580 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv env, jclass cls)) 1581 assert (cls != NULL, "illegal class"); 1582 JVMWrapper("JVM_GetClassTypeAnnotations"); 1583 ResourceMark rm(THREAD); 1584 // Return null for arrays and primitives 1585 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1586 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1587 if (k->oop_is_instance()) { 1588 AnnotationArray type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1589 if (type_annotations != NULL) { 1590 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1591 return (jbyteArray) JNIHandles::make_local(env, a); 1592 } 1593 } 1594 } 1595 return NULL; 1596 JVM_END 1597 1598 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv env, jobject method)) 1599 assert (method != NULL, "illegal method"); 1600 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1601 1602 // method is a handle to a java.lang.reflect.Method object 1603 Method m = jvm_get_method_common(method); 1604 if (m == NULL) { 1605 return NULL; 1606 } 1607 1608 AnnotationArray type_annotations = m->type_annotations(); 1609 if (type_annotations != NULL) { 1610 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1611 return (jbyteArray) JNIHandles::make_local(env, a); 1612 } 1613 1614 return NULL; 1615 JVM_END 1616 1617 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv env, jobject field)) 1618 assert (field != NULL, "illegal field"); 1619 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1620 1621 fieldDescriptor fd; 1622 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1623 if (!gotFd) { 1624 return NULL; 1625 } 1626 1627 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1628 JVM_END 1629 1630 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { 1631 if (!cp->is_within_bounds(index)) { 1632 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1633 } 1634 } 1635 1636 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv env, jobject method)) 1637 { 1638 JVMWrapper("JVM_GetMethodParameters"); 1639 // method is a handle to a java.lang.reflect.Method object 1640 Method method_ptr = jvm_get_method_common(method); 1641 methodHandle mh (THREAD, method_ptr); 1642 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1643 const int num_params = mh->method_parameters_length(); 1644 1645 if (num_params < 0) { 1646 // A -1 return value from method_parameters_length means there is no 1647 // parameter data. Return null to indicate this to the reflection 1648 // API. 1649 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1650 return (jobjectArray)NULL; 1651 } else { 1652 // Otherwise, we return something up to reflection, even if it is 1653 // a zero-length array. Why? Because in some cases this can 1654 // trigger a MalformedParametersException. 1655 1656 // make sure all the symbols are properly formatted 1657 for (int i = 0; i < num_params; i++) { 1658 MethodParametersElement* params = mh->method_parameters_start(); 1659 int index = params[i].name_cp_index; 1660 bounds_check(mh->constants(), index, CHECK_NULL); 1661 1662 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1663 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1664 "Wrong type at constant pool index"); 1665 } 1666 1667 } 1668 1669 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1670 objArrayHandle result (THREAD, result_oop); 1671 1672 for (int i = 0; i < num_params; i++) { 1673 MethodParametersElement* params = mh->method_parameters_start(); 1674 // For a 0 index, give a NULL symbol 1675 Symbol sym = 0 != params[i].name_cp_index ? 1676 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1677 int flags = params[i].flags; 1678 oop param = Reflection::new_parameter(reflected_method, i, sym, 1679 flags, CHECK_NULL); 1680 result->obj_at_put(i, param); 1681 } 1682 return (jobjectArray)JNIHandles::make_local(env, result()); 1683 } 1684 } 1685 JVM_END 1686 1687 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1688 1689 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv env, jclass ofClass, jboolean publicOnly)) 1690 { 1691 JVMWrapper("JVM_GetClassDeclaredFields"); 1692 JvmtiVMObjectAllocEventCollector oam; 1693 1694 // Exclude primitive types and array types 1695 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1696 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 1697 // Return empty array 1698 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1699 return (jobjectArray) JNIHandles::make_local(env, res); 1700 } 1701 1702 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1703 constantPoolHandle cp(THREAD, k->constants()); 1704 1705 // Ensure class is linked 1706 k->link_class(CHECK_NULL); 1707 1708 // 4496456 We need to filter out java.lang.Throwable.backtrace 1709 bool skip_backtrace = false; 1710 1711 // Allocate result 1712 int num_fields; 1713 1714 if (publicOnly) { 1715 num_fields = 0; 1716 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) { 1717 if (fs.access_flags().is_public()) ++num_fields; 1718 } 1719 } else { 1720 num_fields = k->java_fields_count(); 1721 1722 if (k() == SystemDictionary::Throwable_klass()) { 1723 num_fields--; 1724 skip_backtrace = true; 1725 } 1726 } 1727 1728 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1729 objArrayHandle result (THREAD, r); 1730 1731 int out_idx = 0; 1732 fieldDescriptor fd; 1733 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1734 if (skip_backtrace) { 1735 // 4496456 skip java.lang.Throwable.backtrace 1736 int offset = fs.offset(); 1737 if (offset == java_lang_Throwable::get_backtrace_offset()) continue; 1738 } 1739 1740 if (!publicOnly || fs.access_flags().is_public()) { 1741 fd.reinitialize(k(), fs.index()); 1742 oop field = Reflection::new_field(&fd, CHECK_NULL); 1743 result->obj_at_put(out_idx, field); 1744 ++out_idx; 1745 } 1746 } 1747 assert(out_idx == num_fields, "just checking"); 1748 return (jobjectArray) JNIHandles::make_local(env, result()); 1749 } 1750 JVM_END 1751 1752 static bool select_method(methodHandle method, bool want_constructor) { 1753 if (want_constructor) { 1754 return (method->is_initializer() && !method->is_static()); 1755 } else { 1756 return (!method->is_initializer() && !method->is_overpass()); 1757 } 1758 } 1759 1760 static jobjectArray get_class_declared_methods_helper( 1761 JNIEnv env, 1762 jclass ofClass, jboolean publicOnly, 1763 bool want_constructor, 1764 Klass klass, TRAPS) { 1765 1766 JvmtiVMObjectAllocEventCollector oam; 1767 1768 // Exclude primitive types and array types 1769 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1770 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 1771 // Return empty array 1772 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1773 return (jobjectArray) JNIHandles::make_local(env, res); 1774 } 1775 1776 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1777 1778 // Ensure class is linked 1779 k->link_class(CHECK_NULL); 1780 1781 Array<Method*> methods = k->methods(); 1782 int methods_length = methods->length(); 1783 1784 // Save original method_idnum in case of redefinition, which can change 1785 // the idnum of obsolete methods. The new method will have the same idnum 1786 // but if we refresh the methods array, the counts will be wrong. 1787 ResourceMark rm(THREAD); 1788 GrowableArray idnums = new GrowableArray(methods_length); 1789 int num_methods = 0; 1790 1791 for (int i = 0; i < methods_length; i++) { 1792 methodHandle method(THREAD, methods->at(i)); 1793 if (select_method(method, want_constructor)) { 1794 if (!publicOnly || method->is_public()) { 1795 idnums->push(method->method_idnum()); 1796 ++num_methods; 1797 } 1798 } 1799 } 1800 1801 // Allocate result 1802 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1803 objArrayHandle result (THREAD, r); 1804 1805 // Now just put the methods that we selected above, but go by their idnum 1806 // in case of redefinition. The methods can be redefined at any safepoint, 1807 // so above when allocating the oop array and below when creating reflect 1808 // objects. 1809 for (int i = 0; i < num_methods; i++) { 1810 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1811 if (method.is_null()) { 1812 // Method may have been deleted and seems this API can handle null 1813 // Otherwise should probably put a method that throws NSME 1814 result->obj_at_put(i, NULL); 1815 } else { 1816 oop m; 1817 if (want_constructor) { 1818 m = Reflection::new_constructor(method, CHECK_NULL); 1819 } else { 1820 m = Reflection::new_method(method, false, CHECK_NULL); 1821 } 1822 result->obj_at_put(i, m); 1823 } 1824 } 1825 1826 return (jobjectArray) JNIHandles::make_local(env, result()); 1827 } 1828 1829 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv env, jclass ofClass, jboolean publicOnly)) 1830 { 1831 JVMWrapper("JVM_GetClassDeclaredMethods"); 1832 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1833 /want_constructor/ false, 1834 SystemDictionary::reflect_Method_klass(), THREAD); 1835 } 1836 JVM_END 1837 1838 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv env, jclass ofClass, jboolean publicOnly)) 1839 { 1840 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1841 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1842 /want_constructor/ true, 1843 SystemDictionary::reflect_Constructor_klass(), THREAD); 1844 } 1845 JVM_END 1846 1847 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv env, jclass cls)) 1848 { 1849 JVMWrapper("JVM_GetClassAccessFlags"); 1850 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1851 // Primitive type 1852 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1853 } 1854 1855 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1856 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1857 } 1858 JVM_END 1859 1860 1861 // Constant pool access ////////////////////////////////////////////////////////// 1862 1863 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv env, jclass cls)) 1864 { 1865 JVMWrapper("JVM_GetClassConstantPool"); 1866 JvmtiVMObjectAllocEventCollector oam; 1867 1868 // Return null for primitives and arrays 1869 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1870 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1871 if (k->oop_is_instance()) { 1872 instanceKlassHandle k_h(THREAD, k); 1873 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL); 1874 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1875 return JNIHandles::make_local(jcp()); 1876 } 1877 } 1878 return NULL; 1879 } 1880 JVM_END 1881 1882 1883 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv env, jobject obj, jobject unused)) 1884 { 1885 JVMWrapper("JVM_ConstantPoolGetSize"); 1886 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1887 return cp->length(); 1888 } 1889 JVM_END 1890 1891 1892 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv env, jobject obj, jobject unused, jint index)) 1893 { 1894 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1895 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1896 bounds_check(cp, index, CHECK_NULL); 1897 constantTag tag = cp->tag_at(index); 1898 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1899 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1900 } 1901 Klass k = cp->klass_at(index, CHECK_NULL); 1902 return (jclass) JNIHandles::make_local(k->java_mirror()); 1903 } 1904 JVM_END 1905 1906 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv env, jobject obj, jobject unused, jint index)) 1907 { 1908 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1909 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1910 bounds_check(cp, index, CHECK_NULL); 1911 constantTag tag = cp->tag_at(index); 1912 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1913 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1914 } 1915 Klass k = ConstantPool::klass_at_if_loaded(cp, index); 1916 if (k == NULL) return NULL; 1917 return (jclass) JNIHandles::make_local(k->java_mirror()); 1918 } 1919 JVM_END 1920 1921 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1922 constantTag tag = cp->tag_at(index); 1923 if (!tag.is_method() && !tag.is_interface_method()) { 1924 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1925 } 1926 int klass_ref = cp->uncached_klass_ref_index_at(index); 1927 Klass k_o; 1928 if (force_resolution) { 1929 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1930 } else { 1931 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1932 if (k_o == NULL) return NULL; 1933 } 1934 instanceKlassHandle k(THREAD, k_o); 1935 Symbol name = cp->uncached_name_ref_at(index); 1936 Symbol sig = cp->uncached_signature_ref_at(index); 1937 methodHandle m (THREAD, k->find_method(name, sig)); 1938 if (m.is_null()) { 1939 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1940 } 1941 oop method; 1942 if (!m->is_initializer() || m->is_static()) { 1943 method = Reflection::new_method(m, true, CHECK_NULL); 1944 } else { 1945 method = Reflection::new_constructor(m, CHECK_NULL); 1946 } 1947 return JNIHandles::make_local(method); 1948 } 1949 1950 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv env, jobject obj, jobject unused, jint index)) 1951 { 1952 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1953 JvmtiVMObjectAllocEventCollector oam; 1954 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1955 bounds_check(cp, index, CHECK_NULL); 1956 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1957 return res; 1958 } 1959 JVM_END 1960 1961 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv env, jobject obj, jobject unused, jint index)) 1962 { 1963 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 1964 JvmtiVMObjectAllocEventCollector oam; 1965 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1966 bounds_check(cp, index, CHECK_NULL); 1967 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 1968 return res; 1969 } 1970 JVM_END 1971 1972 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1973 constantTag tag = cp->tag_at(index); 1974 if (!tag.is_field()) { 1975 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1976 } 1977 int klass_ref = cp->uncached_klass_ref_index_at(index); 1978 Klass k_o; 1979 if (force_resolution) { 1980 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1981 } else { 1982 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1983 if (k_o == NULL) return NULL; 1984 } 1985 instanceKlassHandle k(THREAD, k_o); 1986 Symbol name = cp->uncached_name_ref_at(index); 1987 Symbol* sig = cp->uncached_signature_ref_at(index); 1988 fieldDescriptor fd; 1989 Klass* target_klass = k->find_field(name, sig, &fd); 1990 if (target_klass == NULL) { 1991 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 1992 } 1993 oop field = Reflection::new_field(&fd, CHECK_NULL); 1994 return JNIHandles::make_local(field); 1995 } 1996 1997 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv env, jobject obj, jobject unusedl, jint index)) 1998 { 1999 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2000 JvmtiVMObjectAllocEventCollector oam; 2001 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2002 bounds_check(cp, index, CHECK_NULL); 2003 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2004 return res; 2005 } 2006 JVM_END 2007 2008 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv env, jobject obj, jobject unused, jint index)) 2009 { 2010 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2011 JvmtiVMObjectAllocEventCollector oam; 2012 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2013 bounds_check(cp, index, CHECK_NULL); 2014 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2015 return res; 2016 } 2017 JVM_END 2018 2019 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv env, jobject obj, jobject unused, jint index)) 2020 { 2021 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2022 JvmtiVMObjectAllocEventCollector oam; 2023 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2024 bounds_check(cp, index, CHECK_NULL); 2025 constantTag tag = cp->tag_at(index); 2026 if (!tag.is_field_or_method()) { 2027 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2028 } 2029 int klass_ref = cp->uncached_klass_ref_index_at(index); 2030 Symbol klass_name = cp->klass_name_at(klass_ref); 2031 Symbol member_name = cp->uncached_name_ref_at(index); 2032 Symbol member_sig = cp->uncached_signature_ref_at(index); 2033 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2034 objArrayHandle dest(THREAD, dest_o); 2035 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2036 dest->obj_at_put(0, str()); 2037 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2038 dest->obj_at_put(1, str()); 2039 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2040 dest->obj_at_put(2, str()); 2041 return (jobjectArray) JNIHandles::make_local(dest()); 2042 } 2043 JVM_END 2044 2045 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv env, jobject obj, jobject unused, jint index)) 2046 { 2047 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2048 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2049 bounds_check(cp, index, CHECK_0); 2050 constantTag tag = cp->tag_at(index); 2051 if (!tag.is_int()) { 2052 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2053 } 2054 return cp->int_at(index); 2055 } 2056 JVM_END 2057 2058 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv env, jobject obj, jobject unused, jint index)) 2059 { 2060 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2061 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2062 bounds_check(cp, index, CHECK_(0L)); 2063 constantTag tag = cp->tag_at(index); 2064 if (!tag.is_long()) { 2065 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2066 } 2067 return cp->long_at(index); 2068 } 2069 JVM_END 2070 2071 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv env, jobject obj, jobject unused, jint index)) 2072 { 2073 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2074 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2075 bounds_check(cp, index, CHECK_(0.0f)); 2076 constantTag tag = cp->tag_at(index); 2077 if (!tag.is_float()) { 2078 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2079 } 2080 return cp->float_at(index); 2081 } 2082 JVM_END 2083 2084 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv env, jobject obj, jobject unused, jint index)) 2085 { 2086 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2087 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2088 bounds_check(cp, index, CHECK_(0.0)); 2089 constantTag tag = cp->tag_at(index); 2090 if (!tag.is_double()) { 2091 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2092 } 2093 return cp->double_at(index); 2094 } 2095 JVM_END 2096 2097 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv env, jobject obj, jobject unused, jint index)) 2098 { 2099 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2100 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2101 bounds_check(cp, index, CHECK_NULL); 2102 constantTag tag = cp->tag_at(index); 2103 if (!tag.is_string()) { 2104 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2105 } 2106 oop str = cp->string_at(index, CHECK_NULL); 2107 return (jstring) JNIHandles::make_local(str); 2108 } 2109 JVM_END 2110 2111 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv env, jobject obj, jobject unused, jint index)) 2112 { 2113 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2114 JvmtiVMObjectAllocEventCollector oam; 2115 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2116 bounds_check(cp, index, CHECK_NULL); 2117 constantTag tag = cp->tag_at(index); 2118 if (!tag.is_symbol()) { 2119 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2120 } 2121 Symbol sym = cp->symbol_at(index); 2122 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2123 return (jstring) JNIHandles::make_local(str()); 2124 } 2125 JVM_END 2126 2127 2128 // Assertion support. ////////////////////////////////////////////////////////// 2129 2130 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv env, jclass unused, jclass cls)) 2131 JVMWrapper("JVM_DesiredAssertionStatus"); 2132 assert(cls != NULL, "bad class"); 2133 2134 oop r = JNIHandles::resolve(cls); 2135 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2136 if (java_lang_Class::is_primitive(r)) return false; 2137 2138 Klass k = java_lang_Class::as_Klass(r); 2139 assert(k->oop_is_instance(), "must be an instance klass"); 2140 if (! k->oop_is_instance()) return false; 2141 2142 ResourceMark rm(THREAD); 2143 const char name = k->name()->as_C_string(); 2144 bool system_class = k->class_loader() == NULL; 2145 return JavaAssertions::enabled(name, system_class); 2146 2147 JVM_END 2148 2149 2150 // Return a new AssertionStatusDirectives object with the fields filled in with 2151 // command-line assertion arguments (i.e., -ea, -da). 2152 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv env, jclass unused)) 2153 JVMWrapper("JVM_AssertionStatusDirectives"); 2154 JvmtiVMObjectAllocEventCollector oam; 2155 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2156 return JNIHandles::make_local(env, asd); 2157 JVM_END 2158 2159 // Verification //////////////////////////////////////////////////////////////////////////////// 2160 2161 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2162 2163 // RedefineClasses support: bug 6214132 caused verification to fail. 2164 // All functions from this section should call the jvmtiThreadSate function: 2165 // Klass class_to_verify_considering_redefinition(Klass klass). 2166 // The function returns a Klass of the _scratch_class if the verifier 2167 // was invoked in the middle of the class redefinition. 2168 // Otherwise it returns its argument value which is the _the_class Klass. 2169 // Please, refer to the description in the jvmtiThreadSate.hpp. 2170 2171 JVM_ENTRY(const char, JVM_GetClassNameUTF(JNIEnv env, jclass cls)) 2172 JVMWrapper("JVM_GetClassNameUTF"); 2173 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2174 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2175 return k->name()->as_utf8(); 2176 JVM_END 2177 2178 2179 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv env, jclass cls, unsigned char types)) 2180 JVMWrapper("JVM_GetClassCPTypes"); 2181 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2182 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2183 // types will have length zero if this is not an InstanceKlass 2184 // (length is determined by call to JVM_GetClassCPEntriesCount) 2185 if (k->oop_is_instance()) { 2186 ConstantPool cp = InstanceKlass::cast(k)->constants(); 2187 for (int index = cp->length() - 1; index >= 0; index--) { 2188 constantTag tag = cp->tag_at(index); 2189 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2190 } 2191 } 2192 JVM_END 2193 2194 2195 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv env, jclass cls)) 2196 JVMWrapper("JVM_GetClassCPEntriesCount"); 2197 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2198 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2199 if (!k->oop_is_instance()) 2200 return 0; 2201 return InstanceKlass::cast(k)->constants()->length(); 2202 JVM_END 2203 2204 2205 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv env, jclass cls)) 2206 JVMWrapper("JVM_GetClassFieldsCount"); 2207 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2208 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2209 if (!k->oop_is_instance()) 2210 return 0; 2211 return InstanceKlass::cast(k)->java_fields_count(); 2212 JVM_END 2213 2214 2215 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv env, jclass cls)) 2216 JVMWrapper("JVM_GetClassMethodsCount"); 2217 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2218 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2219 if (!k->oop_is_instance()) 2220 return 0; 2221 return InstanceKlass::cast(k)->methods()->length(); 2222 JVM_END 2223 2224 2225 // The following methods, used for the verifier, are never called with 2226 // array klasses, so a direct cast to InstanceKlass is safe. 2227 // Typically, these methods are called in a loop with bounds determined 2228 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2229 // zero for arrays. 2230 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv env, jclass cls, jint method_index, unsigned short exceptions)) 2231 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2232 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2233 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2234 Method method = InstanceKlass::cast(k)->methods()->at(method_index); 2235 int length = method->checked_exceptions_length(); 2236 if (length > 0) { 2237 CheckedExceptionElement* table= method->checked_exceptions_start(); 2238 for (int i = 0; i < length; i++) { 2239 exceptions[i] = table[i].class_cp_index; 2240 } 2241 } 2242 JVM_END 2243 2244 2245 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv env, jclass cls, jint method_index)) 2246 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2247 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2248 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2249 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2250 return method->checked_exceptions_length(); 2251 JVM_END 2252 2253 2254 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv env, jclass cls, jint method_index, unsigned char code)) 2255 JVMWrapper("JVM_GetMethodIxByteCode"); 2256 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2257 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2258 Method method = InstanceKlass::cast(k)->methods()->at(method_index); 2259 memcpy(code, method->code_base(), method->code_size()); 2260 JVM_END 2261 2262 2263 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv env, jclass cls, jint method_index)) 2264 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2265 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2266 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2267 Method method = InstanceKlass::cast(k)->methods()->at(method_index); 2268 return method->code_size(); 2269 JVM_END 2270 2271 2272 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType entry)) 2273 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2274 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2275 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2276 Method method = InstanceKlass::cast(k)->methods()->at(method_index); 2277 ExceptionTable extable(method); 2278 entry->start_pc = extable.start_pc(entry_index); 2279 entry->end_pc = extable.end_pc(entry_index); 2280 entry->handler_pc = extable.handler_pc(entry_index); 2281 entry->catchType = extable.catch_type_index(entry_index); 2282 JVM_END 2283 2284 2285 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv env, jclass cls, int method_index)) 2286 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2287 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2288 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2289 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2290 return method->exception_table_length(); 2291 JVM_END 2292 2293 2294 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv env, jclass cls, int method_index)) 2295 JVMWrapper("JVM_GetMethodIxModifiers"); 2296 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2297 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2298 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2299 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2300 JVM_END 2301 2302 2303 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv env, jclass cls, int field_index)) 2304 JVMWrapper("JVM_GetFieldIxModifiers"); 2305 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2306 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2307 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2308 JVM_END 2309 2310 2311 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv env, jclass cls, int method_index)) 2312 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2313 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2314 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2315 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2316 return method->max_locals(); 2317 JVM_END 2318 2319 2320 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv env, jclass cls, int method_index)) 2321 JVMWrapper("JVM_GetMethodIxArgsSize"); 2322 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2323 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2324 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2325 return method->size_of_parameters(); 2326 JVM_END 2327 2328 2329 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv env, jclass cls, int method_index)) 2330 JVMWrapper("JVM_GetMethodIxMaxStack"); 2331 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2332 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2333 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2334 return method->verifier_max_stack(); 2335 JVM_END 2336 2337 2338 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv env, jclass cls, int method_index)) 2339 JVMWrapper("JVM_IsConstructorIx"); 2340 ResourceMark rm(THREAD); 2341 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2342 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2343 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2344 return method->name() == vmSymbols::object_initializer_name(); 2345 JVM_END 2346 2347 2348 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv env, jclass cls, int method_index)) 2349 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2350 ResourceMark rm(THREAD); 2351 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2352 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2353 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2354 return method->is_overpass(); 2355 JVM_END 2356 2357 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv env, jclass cls, jint method_index)) 2358 JVMWrapper("JVM_GetMethodIxIxUTF"); 2359 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2360 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2361 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2362 return method->name()->as_utf8(); 2363 JVM_END 2364 2365 2366 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv env, jclass cls, jint method_index)) 2367 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2368 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2369 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2370 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2371 return method->signature()->as_utf8(); 2372 JVM_END 2373 2374 /** 2375 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2376 * read entries in the constant pool. Since the old verifier always 2377 * works on a copy of the code, it will not see any rewriting that 2378 * may possibly occur in the middle of verification. So it is important 2379 * that nothing it calls tries to use the cpCache instead of the raw 2380 * constant pool, so we must use cp->uncached_x methods when appropriate. 2381 / 2382 JVM_ENTRY(const char, JVM_GetCPFieldNameUTF(JNIEnv env, jclass cls, jint cp_index)) 2383 JVMWrapper("JVM_GetCPFieldNameUTF"); 2384 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2385 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2386 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2387 switch (cp->tag_at(cp_index).value()) { 2388 case JVM_CONSTANT_Fieldref: 2389 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2390 default: 2391 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2392 } 2393 ShouldNotReachHere(); 2394 return NULL; 2395 JVM_END 2396 2397 2398 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv env, jclass cls, jint cp_index)) 2399 JVMWrapper("JVM_GetCPMethodNameUTF"); 2400 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2401 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2402 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2403 switch (cp->tag_at(cp_index).value()) { 2404 case JVM_CONSTANT_InterfaceMethodref: 2405 case JVM_CONSTANT_Methodref: 2406 case JVM_CONSTANT_NameAndType: // for invokedynamic 2407 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2408 default: 2409 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2410 } 2411 ShouldNotReachHere(); 2412 return NULL; 2413 JVM_END 2414 2415 2416 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv env, jclass cls, jint cp_index)) 2417 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 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_InterfaceMethodref: 2423 case JVM_CONSTANT_Methodref: 2424 case JVM_CONSTANT_NameAndType: // for invokedynamic 2425 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2426 default: 2427 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2428 } 2429 ShouldNotReachHere(); 2430 return NULL; 2431 JVM_END 2432 2433 2434 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv env, jclass cls, jint cp_index)) 2435 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2436 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2437 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2438 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2439 switch (cp->tag_at(cp_index).value()) { 2440 case JVM_CONSTANT_Fieldref: 2441 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2442 default: 2443 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2444 } 2445 ShouldNotReachHere(); 2446 return NULL; 2447 JVM_END 2448 2449 2450 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv env, jclass cls, jint cp_index)) 2451 JVMWrapper("JVM_GetCPClassNameUTF"); 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 Symbol* classname = cp->klass_name_at(cp_index); 2456 return classname->as_utf8(); 2457 JVM_END 2458 2459 2460 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv env, jclass cls, jint cp_index)) 2461 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2462 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2463 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2464 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2465 switch (cp->tag_at(cp_index).value()) { 2466 case JVM_CONSTANT_Fieldref: { 2467 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2468 Symbol* classname = cp->klass_name_at(class_index); 2469 return classname->as_utf8(); 2470 } 2471 default: 2472 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2473 } 2474 ShouldNotReachHere(); 2475 return NULL; 2476 JVM_END 2477 2478 2479 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv env, jclass cls, jint cp_index)) 2480 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2481 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2482 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2483 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2484 switch (cp->tag_at(cp_index).value()) { 2485 case JVM_CONSTANT_Methodref: 2486 case JVM_CONSTANT_InterfaceMethodref: { 2487 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2488 Symbol* classname = cp->klass_name_at(class_index); 2489 return classname->as_utf8(); 2490 } 2491 default: 2492 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2493 } 2494 ShouldNotReachHere(); 2495 return NULL; 2496 JVM_END 2497 2498 2499 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv env, jclass cls, int cp_index, jclass called_cls)) 2500 JVMWrapper("JVM_GetCPFieldModifiers"); 2501 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2502 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2503 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2504 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2505 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2506 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2507 switch (cp->tag_at(cp_index).value()) { 2508 case JVM_CONSTANT_Fieldref: { 2509 Symbol* name = cp->uncached_name_ref_at(cp_index); 2510 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2511 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) { 2512 if (fs.name() == name && fs.signature() == signature) { 2513 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2514 } 2515 } 2516 return -1; 2517 } 2518 default: 2519 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2520 } 2521 ShouldNotReachHere(); 2522 return 0; 2523 JVM_END 2524 2525 2526 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv env, jclass cls, int cp_index, jclass called_cls)) 2527 JVMWrapper("JVM_GetCPMethodModifiers"); 2528 Klass k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2529 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2530 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2531 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2532 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2533 switch (cp->tag_at(cp_index).value()) { 2534 case JVM_CONSTANT_Methodref: 2535 case JVM_CONSTANT_InterfaceMethodref: { 2536 Symbol* name = cp->uncached_name_ref_at(cp_index); 2537 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2538 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2539 int methods_count = methods->length(); 2540 for (int i = 0; i < methods_count; i++) { 2541 Method* method = methods->at(i); 2542 if (method->name() == name && method->signature() == signature) { 2543 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2544 } 2545 } 2546 return -1; 2547 } 2548 default: 2549 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2550 } 2551 ShouldNotReachHere(); 2552 return 0; 2553 JVM_END 2554 2555 2556 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2557 2558 JVM_LEAF(void, JVM_ReleaseUTF(const char utf)) 2559 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2560 JVM_END 2561 2562 2563 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv env, jclass class1, jclass class2)) 2564 JVMWrapper("JVM_IsSameClassPackage"); 2565 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2566 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2567 Klass klass1 = java_lang_Class::as_Klass(class1_mirror); 2568 Klass klass2 = java_lang_Class::as_Klass(class2_mirror); 2569 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2570 JVM_END 2571 2572 // Printing support ////////////////////////////////////////////////// 2573 extern "C" { 2574 2575 ATTRIBUTE_PRINTF(3, 0) 2576 int jio_vsnprintf(char str, size_t count, const char fmt, va_list args) { 2577 // see bug 4399518, 4417214 2578 if ((intptr_t)count <= 0) return -1; 2579 2580 int result = vsnprintf(str, count, fmt, args); 2581 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2582 // characters which would have been written had the buffer been large 2583 // enough; on Windows, it returns -1. We handle both cases here and 2584 // always return -1, and perform null termination. 2585 if ((result > 0 && (size_t)result >= count) || result == -1) { 2586 str[count - 1] = '\0'; 2587 result = -1; 2588 } 2589 2590 return result; 2591 } 2592 2593 ATTRIBUTE_PRINTF(3, 0) 2594 int jio_snprintf(char str, size_t count, const char fmt, ...) { 2595 va_list args; 2596 int len; 2597 va_start(args, fmt); 2598 len = jio_vsnprintf(str, count, fmt, args); 2599 va_end(args); 2600 return len; 2601 } 2602 2603 ATTRIBUTE_PRINTF(2,3) 2604 int jio_fprintf(FILE f, const char fmt, ...) { 2605 int len; 2606 va_list args; 2607 va_start(args, fmt); 2608 len = jio_vfprintf(f, fmt, args); 2609 va_end(args); 2610 return len; 2611 } 2612 2613 ATTRIBUTE_PRINTF(2, 0) 2614 int jio_vfprintf(FILE f, const char fmt, va_list args) { 2615 if (Arguments::vfprintf_hook() != NULL) { 2616 return Arguments::vfprintf_hook()(f, fmt, args); 2617 } else { 2618 return vfprintf(f, fmt, args); 2619 } 2620 } 2621 2622 ATTRIBUTE_PRINTF(1, 2) 2623 JNIEXPORT int jio_printf(const char fmt, ...) { 2624 int len; 2625 va_list args; 2626 va_start(args, fmt); 2627 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2628 va_end(args); 2629 return len; 2630 } 2631 2632 2633 // HotSpot specific jio method 2634 void jio_print(const char s) { 2635 // Try to make this function as atomic as possible. 2636 if (Arguments::vfprintf_hook() != NULL) { 2637 jio_fprintf(defaultStream::output_stream(), "%s", s); 2638 } else { 2639 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2640 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2641 } 2642 } 2643 2644 } // Extern C 2645 2646 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2647 2648 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 2649 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or 2650 // OSThread objects. The exception to this rule is when the target object is the thread 2651 // doing the operation, in which case we know that the thread won't exit until the 2652 // operation is done (all exits being voluntary). There are a few cases where it is 2653 // rather silly to do operations on yourself, like resuming yourself or asking whether 2654 // you are alive. While these can still happen, they are not subject to deadlocks if 2655 // the lock is held while the operation occurs (this is not the case for suspend, for 2656 // instance), and are very unlikely. Because IsAlive needs to be fast and its 2657 // implementation is local to this file, we always lock Threads_lock for that one. 2658 2659 static void thread_entry(JavaThread thread, TRAPS) { 2660 HandleMark hm(THREAD); 2661 Handle obj(THREAD, thread->threadObj()); 2662 JavaValue result(T_VOID); 2663 JavaCalls::call_virtual(&result, 2664 obj, 2665 KlassHandle(THREAD, SystemDictionary::Thread_klass()), 2666 vmSymbols::run_method_name(), 2667 vmSymbols::void_method_signature(), 2668 THREAD); 2669 } 2670 2671 2672 JVM_ENTRY(void, JVM_StartThread(JNIEnv env, jobject jthread)) 2673 JVMWrapper("JVM_StartThread"); 2674 JavaThread native_thread = NULL; 2675 2676 // We cannot hold the Threads_lock when we throw an exception, 2677 // due to rank ordering issues. Example: we might need to grab the 2678 // Heap_lock while we construct the exception. 2679 bool throw_illegal_thread_state = false; 2680 2681 // We must release the Threads_lock before we can post a jvmti event 2682 // in Thread::start. 2683 { 2684 // Ensure that the C++ Thread and OSThread structures aren't freed before 2685 // we operate. 2686 MutexLocker mu(Threads_lock); 2687 2688 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2689 // re-starting an already started thread, so we should usually find 2690 // that the JavaThread is null. However for a JNI attached thread 2691 // there is a small window between the Thread object being created 2692 // (with its JavaThread set) and the update to its threadStatus, so we 2693 // have to check for this 2694 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2695 throw_illegal_thread_state = true; 2696 } else { 2697 // We could also check the stillborn flag to see if this thread was already stopped, but 2698 // for historical reasons we let the thread detect that itself when it starts running 2699 2700 jlong size = 2701 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2702 // Allocate the C++ Thread structure and create the native thread. The 2703 // stack size retrieved from java is signed, but the constructor takes 2704 // size_t (an unsigned type), so avoid passing negative values which would 2705 // result in really large stacks. 2706 size_t sz = size > 0 ? (size_t) size : 0; 2707 native_thread = new JavaThread(&thread_entry, sz); 2708 2709 // At this point it may be possible that no osthread was created for the 2710 // JavaThread due to lack of memory. Check for this situation and throw 2711 // an exception if necessary. Eventually we may want to change this so 2712 // that we only grab the lock if the thread was created successfully - 2713 // then we can also do this check and throw the exception in the 2714 // JavaThread constructor. 2715 if (native_thread->osthread() != NULL) { 2716 // Note: the current thread is not being used within "prepare". 2717 native_thread->prepare(jthread); 2718 } 2719 } 2720 } 2721 2722 if (throw_illegal_thread_state) { 2723 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2724 } 2725 2726 assert(native_thread != NULL, "Starting null thread?"); 2727 2728 if (native_thread->osthread() == NULL) { 2729 // No one should hold a reference to the 'native_thread'. 2730 delete native_thread; 2731 if (JvmtiExport::should_post_resource_exhausted()) { 2732 JvmtiExport::post_resource_exhausted( 2733 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2734 os::native_thread_creation_failed_msg()); 2735 } 2736 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2737 os::native_thread_creation_failed_msg()); 2738 } 2739 2740 Thread::start(native_thread); 2741 2742 JVM_END 2743 2744 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2745 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2746 // but is thought to be reliable and simple. In the case, where the receiver is the 2747 // same thread as the sender, no safepoint is needed. 2748 JVM_ENTRY(void, JVM_StopThread(JNIEnv env, jobject jthread, jobject throwable)) 2749 JVMWrapper("JVM_StopThread"); 2750 2751 oop java_throwable = JNIHandles::resolve(throwable); 2752 if (java_throwable == NULL) { 2753 THROW(vmSymbols::java_lang_NullPointerException()); 2754 } 2755 oop java_thread = JNIHandles::resolve_non_null(jthread); 2756 JavaThread receiver = java_lang_Thread::thread(java_thread); 2757 Events::log_exception(JavaThread::current(), 2758 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2759 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2760 // First check if thread is alive 2761 if (receiver != NULL) { 2762 // Check if exception is getting thrown at self (use oop equality, since the 2763 // target object might exit) 2764 if (java_thread == thread->threadObj()) { 2765 THROW_OOP(java_throwable); 2766 } else { 2767 // Enques a VM_Operation to stop all threads and then deliver the exception... 2768 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 2769 } 2770 } 2771 else { 2772 // Either: 2773 // - target thread has not been started before being stopped, or 2774 // - target thread already terminated 2775 // We could read the threadStatus to determine which case it is 2776 // but that is overkill as it doesn't matter. We must set the 2777 // stillborn flag for the first case, and if the thread has already 2778 // exited setting this flag has no affect 2779 java_lang_Thread::set_stillborn(java_thread); 2780 } 2781 JVM_END 2782 2783 2784 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv env, jobject jthread)) 2785 JVMWrapper("JVM_IsThreadAlive"); 2786 2787 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2788 return java_lang_Thread::is_alive(thread_oop); 2789 JVM_END 2790 2791 2792 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2793 JVMWrapper("JVM_SuspendThread"); 2794 oop java_thread = JNIHandles::resolve_non_null(jthread); 2795 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2796 2797 if (receiver != NULL) { 2798 // thread has run and has not exited (still on threads list) 2799 2800 { 2801 MutexLockerEx ml(receiver->SR_lock(), Mutex::no_safepoint_check_flag); 2802 if (receiver->is_external_suspend()) { 2803 // Don't allow nested external suspend requests. We can't return 2804 // an error from this interface so just ignore the problem. 2805 return; 2806 } 2807 if (receiver->is_exiting()) { // thread is in the process of exiting 2808 return; 2809 } 2810 receiver->set_external_suspend(); 2811 } 2812 2813 // java_suspend() will catch threads in the process of exiting 2814 // and will ignore them. 2815 receiver->java_suspend(); 2816 2817 // It would be nice to have the following assertion in all the 2818 // time, but it is possible for a racing resume request to have 2819 // resumed this thread right after we suspended it. Temporarily 2820 // enable this assertion if you are chasing a different kind of 2821 // bug. 2822 // 2823 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2824 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2825 } 2826 JVM_END 2827 2828 2829 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2830 JVMWrapper("JVM_ResumeThread"); 2831 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 2832 // We need to always get the threads lock here, since this operation cannot be allowed during 2833 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2834 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2835 // looks at it. 2836 MutexLocker ml(Threads_lock); 2837 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2838 if (thr != NULL) { 2839 // the thread has run and is not in the process of exiting 2840 thr->java_resume(); 2841 } 2842 JVM_END 2843 2844 2845 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2846 JVMWrapper("JVM_SetThreadPriority"); 2847 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2848 MutexLocker ml(Threads_lock); 2849 oop java_thread = JNIHandles::resolve_non_null(jthread); 2850 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2851 JavaThread* thr = java_lang_Thread::thread(java_thread); 2852 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 2853 Thread::set_priority(thr, (ThreadPriority)prio); 2854 } 2855 JVM_END 2856 2857 2858 JVM_ENTRY(void, JVM_Yield(JNIEnv env, jclass threadClass)) 2859 JVMWrapper("JVM_Yield"); 2860 if (os::dont_yield()) return; 2861 HOTSPOT_THREAD_YIELD(); 2862 2863 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield. 2864 // Critical for similar threading behaviour 2865 if (ConvertYieldToSleep) { 2866 os::sleep(thread, MinSleepInterval, false); 2867 } else { 2868 os::naked_yield(); 2869 } 2870 JVM_END 2871 2872 2873 JVM_ENTRY(void, JVM_Sleep(JNIEnv env, jclass threadClass, jlong millis)) 2874 JVMWrapper("JVM_Sleep"); 2875 2876 if (millis < 0) { 2877 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2878 } 2879 2880 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2881 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2882 } 2883 2884 // Save current thread state and restore it at the end of this block. 2885 // And set new thread state to SLEEPING. 2886 JavaThreadSleepState jtss(thread); 2887 2888 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 2889 2890 EventThreadSleep event; 2891 2892 if (millis == 0) { 2893 // When ConvertSleepToYield is on, this matches the classic VM implementation of 2894 // JVM_Sleep. Critical for similar threading behaviour (Win32) 2895 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep 2896 // for SOLARIS 2897 if (ConvertSleepToYield) { 2898 os::naked_yield(); 2899 } else { 2900 ThreadState old_state = thread->osthread()->get_state(); 2901 thread->osthread()->set_state(SLEEPING); 2902 os::sleep(thread, MinSleepInterval, false); 2903 thread->osthread()->set_state(old_state); 2904 } 2905 } else { 2906 ThreadState old_state = thread->osthread()->get_state(); 2907 thread->osthread()->set_state(SLEEPING); 2908 if (os::sleep(thread, millis, true) == OS_INTRPT) { 2909 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 2910 // us while we were sleeping. We do not overwrite those. 2911 if (!HAS_PENDING_EXCEPTION) { 2912 if (event.should_commit()) { 2913 event.set_time(millis); 2914 event.commit(); 2915 } 2916 HOTSPOT_THREAD_SLEEP_END(1); 2917 2918 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 2919 // to properly restore the thread state. That's likely wrong. 2920 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2921 } 2922 } 2923 thread->osthread()->set_state(old_state); 2924 } 2925 if (event.should_commit()) { 2926 event.set_time(millis); 2927 event.commit(); 2928 } 2929 HOTSPOT_THREAD_SLEEP_END(0); 2930 JVM_END 2931 2932 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 2933 JVMWrapper("JVM_CurrentThread"); 2934 oop jthread = thread->threadObj(); 2935 assert (thread != NULL, "no current thread!"); 2936 return JNIHandles::make_local(env, jthread); 2937 JVM_END 2938 2939 2940 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 2941 JVMWrapper("JVM_CountStackFrames"); 2942 2943 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2944 oop java_thread = JNIHandles::resolve_non_null(jthread); 2945 bool throw_illegal_thread_state = false; 2946 int count = 0; 2947 2948 { 2949 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 2950 // We need to re-resolve the java_thread, since a GC might have happened during the 2951 // acquire of the lock 2952 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2953 2954 if (thr == NULL) { 2955 // do nothing 2956 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 2957 // Check whether this java thread has been suspended already. If not, throws 2958 // IllegalThreadStateException. We defer to throw that exception until 2959 // Threads_lock is released since loading exception class has to leave VM. 2960 // The correct way to test a thread is actually suspended is 2961 // wait_for_ext_suspend_completion(), but we can't call that while holding 2962 // the Threads_lock. The above tests are sufficient for our purposes 2963 // provided the walkability of the stack is stable - which it isn't 2964 // 100% but close enough for most practical purposes. 2965 throw_illegal_thread_state = true; 2966 } else { 2967 // Count all java activation, i.e., number of vframes 2968 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 2969 // Native frames are not counted 2970 if (!vfst.method()->is_native()) count++; 2971 } 2972 } 2973 } 2974 2975 if (throw_illegal_thread_state) { 2976 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 2977 "this thread is not suspended"); 2978 } 2979 return count; 2980 JVM_END 2981 2982 // Consider: A better way to implement JVM_Interrupt() is to acquire 2983 // Threads_lock to resolve the jthread into a Thread pointer, fetch 2984 // Thread->platformevent, Thread->native_thr, Thread->parker, etc., 2985 // drop Threads_lock, and the perform the unpark() and thr_kill() operations 2986 // outside the critical section. Threads_lock is hot so we want to minimize 2987 // the hold-time. A cleaner interface would be to decompose interrupt into 2988 // two steps. The 1st phase, performed under Threads_lock, would return 2989 // a closure that'd be invoked after Threads_lock was dropped. 2990 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 2991 // admit spurious wakeups. 2992 2993 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 2994 JVMWrapper("JVM_Interrupt"); 2995 2996 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2997 oop java_thread = JNIHandles::resolve_non_null(jthread); 2998 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 2999 // We need to re-resolve the java_thread, since a GC might have happened during the 3000 // acquire of the lock 3001 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3002 if (thr != NULL) { 3003 Thread::interrupt(thr); 3004 } 3005 JVM_END 3006 3007 3008 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3009 JVMWrapper("JVM_IsInterrupted"); 3010 3011 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3012 oop java_thread = JNIHandles::resolve_non_null(jthread); 3013 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3014 // We need to re-resolve the java_thread, since a GC might have happened during the 3015 // acquire of the lock 3016 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3017 if (thr == NULL) { 3018 return JNI_FALSE; 3019 } else { 3020 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3021 } 3022 JVM_END 3023 3024 3025 // Return true iff the current thread has locked the object passed in 3026 3027 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3028 JVMWrapper("JVM_HoldsLock"); 3029 assert(THREAD->is_Java_thread(), "sanity check"); 3030 if (obj == NULL) { 3031 THROW(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3032 } 3033 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3034 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3035 JVM_END 3036 3037 3038 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3039 JVMWrapper("JVM_DumpAllStacks"); 3040 VM_PrintThreads op; 3041 VMThread::execute(&op); 3042 if (JvmtiExport::should_post_data_dump()) { 3043 JvmtiExport::post_data_dump(); 3044 } 3045 JVM_END 3046 3047 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3048 JVMWrapper("JVM_SetNativeThreadName"); 3049 ResourceMark rm(THREAD); 3050 oop java_thread = JNIHandles::resolve_non_null(jthread); 3051 JavaThread* thr = java_lang_Thread::thread(java_thread); 3052 // Thread naming only supported for the current thread, doesn't work for 3053 // target threads. 3054 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3055 // we don't set the name of an attached thread to avoid stepping 3056 // on other programs 3057 const char thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3058 os::set_native_thread_name(thread_name); 3059 } 3060 JVM_END 3061 3062 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3063 3064 static bool is_trusted_frame(JavaThread jthread, vframeStream* vfst) { 3065 assert(jthread->is_Java_thread(), "must be a Java thread"); 3066 if (jthread->privileged_stack_top() == NULL) return false; 3067 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3068 oop loader = jthread->privileged_stack_top()->class_loader(); 3069 if (loader == NULL) return true; 3070 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3071 if (trusted) return true; 3072 } 3073 return false; 3074 } 3075 3076 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv env)) 3077 JVMWrapper("JVM_CurrentLoadedClass"); 3078 ResourceMark rm(THREAD); 3079 3080 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3081 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3082 bool trusted = is_trusted_frame(thread, &vfst); 3083 if (trusted) return NULL; 3084 3085 Method m = vfst.method(); 3086 if (!m->is_native()) { 3087 InstanceKlass* holder = m->method_holder(); 3088 oop loader = holder->class_loader(); 3089 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3090 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3091 } 3092 } 3093 } 3094 return NULL; 3095 JVM_END 3096 3097 3098 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv env)) 3099 JVMWrapper("JVM_CurrentClassLoader"); 3100 ResourceMark rm(THREAD); 3101 3102 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3103 3104 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3105 bool trusted = is_trusted_frame(thread, &vfst); 3106 if (trusted) return NULL; 3107 3108 Method m = vfst.method(); 3109 if (!m->is_native()) { 3110 InstanceKlass* holder = m->method_holder(); 3111 assert(holder->is_klass(), "just checking"); 3112 oop loader = holder->class_loader(); 3113 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3114 return JNIHandles::make_local(env, loader); 3115 } 3116 } 3117 } 3118 return NULL; 3119 JVM_END 3120 3121 3122 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv env)) 3123 JVMWrapper("JVM_GetClassContext"); 3124 ResourceMark rm(THREAD); 3125 JvmtiVMObjectAllocEventCollector oam; 3126 vframeStream vfst(thread); 3127 3128 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3129 // This must only be called from SecurityManager.getClassContext 3130 Method m = vfst.method(); 3131 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3132 m->name() == vmSymbols::getClassContext_name() && 3133 m->signature() == vmSymbols::void_class_array_signature())) { 3134 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3135 } 3136 } 3137 3138 // Collect method holders 3139 GrowableArray* klass_array = new GrowableArray(); 3140 for (; !vfst.at_end(); vfst.security_next()) { 3141 Method* m = vfst.method(); 3142 // Native frames are not returned 3143 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3144 Klass* holder = m->method_holder(); 3145 assert(holder->is_klass(), "just checking"); 3146 klass_array->append(holder); 3147 } 3148 } 3149 3150 // Create result array of type [Ljava/lang/Class; 3151 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3152 // Fill in mirrors corresponding to method holders 3153 for (int i = 0; i < klass_array->length(); i++) { 3154 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3155 } 3156 3157 return (jobjectArray) JNIHandles::make_local(env, result); 3158 JVM_END 3159 3160 3161 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv env, jstring name)) 3162 JVMWrapper("JVM_ClassDepth"); 3163 ResourceMark rm(THREAD); 3164 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3165 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3166 3167 const char str = java_lang_String::as_utf8_string(class_name_str()); 3168 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3169 if (class_name_sym == NULL) { 3170 return -1; 3171 } 3172 3173 int depth = 0; 3174 3175 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3176 if (!vfst.method()->is_native()) { 3177 InstanceKlass* holder = vfst.method()->method_holder(); 3178 assert(holder->is_klass(), "just checking"); 3179 if (holder->name() == class_name_sym) { 3180 return depth; 3181 } 3182 depth++; 3183 } 3184 } 3185 return -1; 3186 JVM_END 3187 3188 3189 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv env)) 3190 JVMWrapper("JVM_ClassLoaderDepth"); 3191 ResourceMark rm(THREAD); 3192 int depth = 0; 3193 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3194 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3195 bool trusted = is_trusted_frame(thread, &vfst); 3196 if (trusted) return -1; 3197 3198 Method m = vfst.method(); 3199 if (!m->is_native()) { 3200 InstanceKlass* holder = m->method_holder(); 3201 assert(holder->is_klass(), "just checking"); 3202 oop loader = holder->class_loader(); 3203 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3204 return depth; 3205 } 3206 depth++; 3207 } 3208 } 3209 return -1; 3210 JVM_END 3211 3212 3213 // java.lang.Package //////////////////////////////////////////////////////////////// 3214 3215 3216 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv env, jstring name)) 3217 JVMWrapper("JVM_GetSystemPackage"); 3218 ResourceMark rm(THREAD); 3219 JvmtiVMObjectAllocEventCollector oam; 3220 char str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3221 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3222 return (jstring) JNIHandles::make_local(result); 3223 JVM_END 3224 3225 3226 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv env)) 3227 JVMWrapper("JVM_GetSystemPackages"); 3228 JvmtiVMObjectAllocEventCollector oam; 3229 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3230 return (jobjectArray) JNIHandles::make_local(result); 3231 JVM_END 3232 3233 3234 // ObjectInputStream /////////////////////////////////////////////////////////////// 3235 3236 bool force_verify_field_access(Klass current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3237 if (current_class == NULL) { 3238 return true; 3239 } 3240 if ((current_class == field_class) || access.is_public()) { 3241 return true; 3242 } 3243 3244 if (access.is_protected()) { 3245 // See if current_class is a subclass of field_class 3246 if (current_class->is_subclass_of(field_class)) { 3247 return true; 3248 } 3249 } 3250 3251 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3252 } 3253 3254 // Return the first non-null class loader up the execution stack, or null 3255 // if only code from the null class loader is on the stack. 3256 3257 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3258 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3259 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3260 oop loader = vfst.method()->method_holder()->class_loader(); 3261 if (loader != NULL) { 3262 return JNIHandles::make_local(env, loader); 3263 } 3264 } 3265 return NULL; 3266 JVM_END 3267 3268 3269 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3270 3271 3272 // resolve array handle and check arguments 3273 static inline arrayOop check_array(JNIEnv env, jobject arr, bool type_array_only, TRAPS) { 3274 if (arr == NULL) { 3275 THROW_0(vmSymbols::java_lang_NullPointerException()); 3276 } 3277 oop a = JNIHandles::resolve_non_null(arr); 3278 if (!a->is_array()) { 3279 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3280 } else if (type_array_only && !a->is_typeArray()) { 3281 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3282 } 3283 return arrayOop(a); 3284 } 3285 3286 3287 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv env, jobject arr)) 3288 JVMWrapper("JVM_GetArrayLength"); 3289 arrayOop a = check_array(env, arr, false, CHECK_0); 3290 return a->length(); 3291 JVM_END 3292 3293 3294 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv env, jobject arr, jint index)) 3295 JVMWrapper("JVM_Array_Get"); 3296 JvmtiVMObjectAllocEventCollector oam; 3297 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3298 jvalue value; 3299 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3300 oop box = Reflection::box(&value, type, CHECK_NULL); 3301 return JNIHandles::make_local(env, box); 3302 JVM_END 3303 3304 3305 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv env, jobject arr, jint index, jint wCode)) 3306 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3307 jvalue value; 3308 value.i = 0; // to initialize value before getting used in CHECK 3309 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3310 assert(a->is_typeArray(), "just checking"); 3311 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3312 BasicType wide_type = (BasicType) wCode; 3313 if (type != wide_type) { 3314 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3315 } 3316 return value; 3317 JVM_END 3318 3319 3320 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv env, jobject arr, jint index, jobject val)) 3321 JVMWrapper("JVM_SetArrayElement"); 3322 arrayOop a = check_array(env, arr, false, CHECK); 3323 oop box = JNIHandles::resolve(val); 3324 jvalue value; 3325 value.i = 0; // to initialize value before getting used in CHECK 3326 BasicType value_type; 3327 if (a->is_objArray()) { 3328 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3329 value_type = Reflection::unbox_for_regular_object(box, &value); 3330 } else { 3331 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3332 } 3333 Reflection::array_set(&value, a, index, value_type, CHECK); 3334 JVM_END 3335 3336 3337 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3338 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3339 arrayOop a = check_array(env, arr, true, CHECK); 3340 assert(a->is_typeArray(), "just checking"); 3341 BasicType value_type = (BasicType) vCode; 3342 Reflection::array_set(&v, a, index, value_type, CHECK); 3343 JVM_END 3344 3345 3346 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv env, jclass eltClass, jint length)) 3347 JVMWrapper("JVM_NewArray"); 3348 JvmtiVMObjectAllocEventCollector oam; 3349 oop element_mirror = JNIHandles::resolve(eltClass); 3350 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3351 return JNIHandles::make_local(env, result); 3352 JVM_END 3353 3354 3355 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv env, jclass eltClass, jintArray dim)) 3356 JVMWrapper("JVM_NewMultiArray"); 3357 JvmtiVMObjectAllocEventCollector oam; 3358 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3359 oop element_mirror = JNIHandles::resolve(eltClass); 3360 assert(dim_array->is_typeArray(), "just checking"); 3361 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3362 return JNIHandles::make_local(env, result); 3363 JVM_END 3364 3365 3366 // Library support /////////////////////////////////////////////////////////////////////////// 3367 3368 JVM_ENTRY_NO_ENV(void, JVM_LoadLibrary(const char name)) 3369 //%note jvm_ct 3370 JVMWrapper2("JVM_LoadLibrary (%s)", name); 3371 char ebuf[1024]; 3372 void load_result; 3373 { 3374 ThreadToNativeFromVM ttnfvm(thread); 3375 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3376 } 3377 if (load_result == NULL) { 3378 char msg[1024]; 3379 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3380 // Since 'ebuf' may contain a string encoded using 3381 // platform encoding scheme, we need to pass 3382 // Exceptions::unsafe_to_utf8 to the new_exception method 3383 // as the last argument. See bug 6367357. 3384 Handle h_exception = 3385 Exceptions::new_exception(thread, 3386 vmSymbols::java_lang_UnsatisfiedLinkError(), 3387 msg, Exceptions::unsafe_to_utf8); 3388 3389 THROW_HANDLE_0(h_exception); 3390 } 3391 return load_result; 3392 JVM_END 3393 3394 3395 JVM_LEAF(void, JVM_UnloadLibrary(void handle)) 3396 JVMWrapper("JVM_UnloadLibrary"); 3397 os::dll_unload(handle); 3398 JVM_END 3399 3400 3401 JVM_LEAF(void, JVM_FindLibraryEntry(void handle, const char name)) 3402 JVMWrapper2("JVM_FindLibraryEntry (%s)", name); 3403 return os::dll_lookup(handle, name); 3404 JVM_END 3405 3406 3407 // JNI version /////////////////////////////////////////////////////////////////////////////// 3408 3409 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3410 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version); 3411 return Threads::is_supported_jni_version_including_1_1(version); 3412 JVM_END 3413 3414 3415 // String support /////////////////////////////////////////////////////////////////////////// 3416 3417 JVM_ENTRY(jstring, JVM_InternString(JNIEnv env, jstring str)) 3418 JVMWrapper("JVM_InternString"); 3419 JvmtiVMObjectAllocEventCollector oam; 3420 if (str == NULL) return NULL; 3421 oop string = JNIHandles::resolve_non_null(str); 3422 oop result = StringTable::intern(string, CHECK_NULL); 3423 return (jstring) JNIHandles::make_local(env, result); 3424 JVM_END 3425 3426 3427 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3428 3429 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3430 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3431 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3432 // that only works with java threads. 3433 3434 3435 JNIEXPORT void JNICALL JVM_RawMonitorCreate(void) { 3436 VM_Exit::block_if_vm_exited(); 3437 JVMWrapper("JVM_RawMonitorCreate"); 3438 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3439 } 3440 3441 3442 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void mon) { 3443 VM_Exit::block_if_vm_exited(); 3444 JVMWrapper("JVM_RawMonitorDestroy"); 3445 delete ((Mutex) mon); 3446 } 3447 3448 3449 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void mon) { 3450 VM_Exit::block_if_vm_exited(); 3451 JVMWrapper("JVM_RawMonitorEnter"); 3452 ((Mutex) mon)->jvm_raw_lock(); 3453 return 0; 3454 } 3455 3456 3457 JNIEXPORT void JNICALL JVM_RawMonitorExit(void mon) { 3458 VM_Exit::block_if_vm_exited(); 3459 JVMWrapper("JVM_RawMonitorExit"); 3460 ((Mutex) mon)->jvm_raw_unlock(); 3461 } 3462 3463 3464 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3465 3466 jclass find_class_from_class_loader(JNIEnv env, Symbol name, jboolean init, 3467 Handle loader, Handle protection_domain, 3468 jboolean throwError, TRAPS) { 3469 // Security Note: 3470 // The Java level wrapper will perform the necessary security check allowing 3471 // us to pass the NULL as the initiating class loader. The VM is responsible for 3472 // the checkPackageAccess relative to the initiating class loader via the 3473 // protection_domain. The protection_domain is passed as NULL by the java code 3474 // if there is no security manager in 3-arg Class.forName(). 3475 Klass klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3476 3477 KlassHandle klass_handle(THREAD, klass); 3478 // Check if we should initialize the class 3479 if (init && klass_handle->oop_is_instance()) { 3480 klass_handle->initialize(CHECK_NULL); 3481 } 3482 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror()); 3483 } 3484 3485 3486 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3487 3488 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3489 JVMWrapper("JVM_InvokeMethod"); 3490 Handle method_handle; 3491 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3492 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3493 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3494 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3495 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3496 jobject res = JNIHandles::make_local(env, result); 3497 if (JvmtiExport::should_post_vm_object_alloc()) { 3498 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3499 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3500 if (java_lang_Class::is_primitive(ret_type)) { 3501 // Only for primitive type vm allocates memory for java object. 3502 // See box() method. 3503 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3504 } 3505 } 3506 return res; 3507 } else { 3508 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3509 } 3510 JVM_END 3511 3512 3513 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3514 JVMWrapper("JVM_NewInstanceFromConstructor"); 3515 oop constructor_mirror = JNIHandles::resolve(c); 3516 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3517 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3518 jobject res = JNIHandles::make_local(env, result); 3519 if (JvmtiExport::should_post_vm_object_alloc()) { 3520 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3521 } 3522 return res; 3523 JVM_END 3524 3525 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3526 3527 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3528 JVMWrapper("JVM_SupportsCX8"); 3529 return VM_Version::supports_cx8(); 3530 JVM_END 3531 3532 // Returns an array of all live Thread objects (VM internal JavaThreads, 3533 // jvmti agent threads, and JNI attaching threads are skipped) 3534 // See CR 6404306 regarding JNI attaching threads 3535 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3536 ResourceMark rm(THREAD); 3537 ThreadsListEnumerator tle(THREAD, false, false); 3538 JvmtiVMObjectAllocEventCollector oam; 3539 3540 int num_threads = tle.num_threads(); 3541 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3542 objArrayHandle threads_ah(THREAD, r); 3543 3544 for (int i = 0; i < num_threads; i++) { 3545 Handle h = tle.get_threadObj(i); 3546 threads_ah->obj_at_put(i, h()); 3547 } 3548 3549 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3550 JVM_END 3551 3552 3553 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3554 // Return StackTraceElement[][], each element is the stack trace of a thread in 3555 // the corresponding entry in the given threads array 3556 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3557 JVMWrapper("JVM_DumpThreads"); 3558 JvmtiVMObjectAllocEventCollector oam; 3559 3560 // Check if threads is null 3561 if (threads == NULL) { 3562 THROW(vmSymbols::java_lang_NullPointerException(), 0); 3563 } 3564 3565 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3566 objArrayHandle ah(THREAD, a); 3567 int num_threads = ah->length(); 3568 // check if threads is non-empty array 3569 if (num_threads == 0) { 3570 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3571 } 3572 3573 // check if threads is not an array of objects of Thread class 3574 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3575 if (k != SystemDictionary::Thread_klass()) { 3576 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3577 } 3578 3579 ResourceMark rm(THREAD); 3580 3581 GrowableArray* thread_handle_array = new GrowableArray(num_threads); 3582 for (int i = 0; i < num_threads; i++) { 3583 oop thread_obj = ah->obj_at(i); 3584 instanceHandle h(THREAD, (instanceOop) thread_obj); 3585 thread_handle_array->append(h); 3586 } 3587 3588 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3589 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3590 3591 JVM_END 3592 3593 // JVM monitoring and management support 3594 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3595 return Management::get_jmm_interface(version); 3596 JVM_END 3597 3598 // com.sun.tools.attach.VirtualMachine agent properties support 3599 // 3600 // Initialize the agent properties with the properties maintained in the VM 3601 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv env, jobject properties)) 3602 JVMWrapper("JVM_InitAgentProperties"); 3603 ResourceMark rm; 3604 3605 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3606 3607 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3608 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3609 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3610 return properties; 3611 JVM_END 3612 3613 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv env, jclass ofClass)) 3614 { 3615 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3616 JvmtiVMObjectAllocEventCollector oam; 3617 3618 if (ofClass == NULL) { 3619 return NULL; 3620 } 3621 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3622 // Special handling for primitive objects 3623 if (java_lang_Class::is_primitive(mirror())) { 3624 return NULL; 3625 } 3626 Klass k = java_lang_Class::as_Klass(mirror()); 3627 if (!k->oop_is_instance()) { 3628 return NULL; 3629 } 3630 instanceKlassHandle ik_h(THREAD, k); 3631 int encl_method_class_idx = ik_h->enclosing_method_class_index(); 3632 if (encl_method_class_idx == 0) { 3633 return NULL; 3634 } 3635 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3636 objArrayHandle dest(THREAD, dest_o); 3637 Klass enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3638 dest->obj_at_put(0, enc_k->java_mirror()); 3639 int encl_method_method_idx = ik_h->enclosing_method_method_index(); 3640 if (encl_method_method_idx != 0) { 3641 Symbol* sym = ik_h->constants()->symbol_at( 3642 extract_low_short_from_int( 3643 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3644 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3645 dest->obj_at_put(1, str()); 3646 sym = ik_h->constants()->symbol_at( 3647 extract_high_short_from_int( 3648 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3649 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3650 dest->obj_at_put(2, str()); 3651 } 3652 return (jobjectArray) JNIHandles::make_local(dest()); 3653 } 3654 JVM_END 3655 3656 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3657 { 3658 memset(info, 0, info_size); 3659 3660 info->jvm_version = Abstract_VM_Version::jvm_version(); 3661 info->update_version = 0; /* 0 in HotSpot Express VM / 3662 info->special_update_version = 0; / 0 in HotSpot Express VM */ 3663 3664 // when we add a new capability in the jvm_version_info struct, we should also 3665 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3666 // counter defined in runtimeService.cpp. 3667 info->is_attachable = AttachListener::is_attach_supported(); 3668 } 3669 JVM_END