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_interface/collectedHeap.inline.hpp" 33 #include "interpreter/bytecode.hpp" 34 #include "memory/barrierSet.inline.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/objArrayKlass.hpp" 40 #include "oops/objArrayOop.inline.hpp" 41 #include "oops/method.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/dtraceJSDT.hpp" 52 #include "runtime/handles.inline.hpp" 53 #include "runtime/init.hpp" 54 #include "runtime/interfaceSupport.hpp" 55 #include "runtime/java.hpp" 56 #include "runtime/javaCalls.hpp" 57 #include "runtime/jfieldIDWorkaround.hpp" 58 #include "runtime/orderAccess.inline.hpp" 59 #include "runtime/os.inline.hpp" 60 #include "runtime/perfData.hpp" 61 #include "runtime/reflection.hpp" 62 #include "runtime/thread.inline.hpp" 63 #include "runtime/vframe.hpp" 64 #include "runtime/vm_operations.hpp" 65 #include "runtime/vm_version.hpp" 66 #include "services/attachListener.hpp" 67 #include "services/management.hpp" 68 #include "services/threadService.hpp" 69 #include "trace/tracing.hpp" 70 #include "utilities/copy.hpp" 71 #include "utilities/defaultStream.hpp" 72 #include "utilities/dtrace.hpp" 73 #include "utilities/events.hpp" 74 #include "utilities/histogram.hpp" 75 #include "utilities/macros.hpp" 76 #include "utilities/top.hpp" 77 #include "utilities/utf8.hpp" 78 #if INCLUDE_CDS 79 #include "classfile/sharedClassUtil.hpp" 80 #include "classfile/systemDictionaryShared.hpp" 81 #endif 82 #ifdef TARGET_OS_FAMILY_linux 83 # include "jvm_linux.h" 84 #endif 85 #ifdef TARGET_OS_FAMILY_solaris 86 # include "jvm_solaris.h" 87 #endif 88 #ifdef TARGET_OS_FAMILY_windows 89 # include "jvm_windows.h" 90 #endif 91 #ifdef TARGET_OS_FAMILY_aix 92 # include "jvm_aix.h" 93 #endif 94 #ifdef TARGET_OS_FAMILY_bsd 95 # include "jvm_bsd.h" 96 #endif 97 98 #include <errno.h> 99 100 /* 101 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 102 such ctors and calls MUST NOT come between an oop declaration/init and its 103 usage because if objects are move this may cause various memory stomps, bus 104 errors and segfaults. Here is a cookbook for causing so called "naked oop 105 failures": 106 107 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 108 JVMWrapper("JVM_GetClassDeclaredFields"); 109 110 // Object address to be held directly in mirror & not visible to GC 111 oop mirror = JNIHandles::resolve_non_null(ofClass); 112 113 // If this ctor can hit a safepoint, moving objects around, then 114 ComplexConstructor foo; 115 116 // Boom! mirror may point to JUNK instead of the intended object 117 (some dereference of mirror) 118 119 // Here's another call that may block for GC, making mirror stale 120 MutexLocker ml(some_lock); 121 122 // And here's an initializer that can result in a stale oop 123 // all in one step. 124 oop o = call_that_can_throw_exception(TRAPS); 125 126 127 The solution is to keep the oop declaration BELOW the ctor or function 128 call that might cause a GC, do another resolve to reassign the oop, or 129 consider use of a Handle instead of an oop so there is immunity from object 130 motion. But note that the "QUICK" entries below do not have a handlemark 131 and thus can only support use of handles passed in. 132 */ 133 134 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 135 ResourceMark rm; 136 int line_number = -1; 137 const char * source_file = NULL; 138 const char * trace = "explicit"; 139 InstanceKlass* caller = NULL; 140 JavaThread* jthread = JavaThread::current(); 141 if (jthread->has_last_Java_frame()) { 142 vframeStream vfst(jthread); 143 144 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 145 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 146 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 147 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 148 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 149 150 Method* last_caller = NULL; 151 152 while (!vfst.at_end()) { 153 Method* m = vfst.method(); 154 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 155 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 156 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 157 break; 158 } 159 last_caller = m; 160 vfst.next(); 161 } 162 // if this is called from Class.forName0 and that is called from Class.forName, 163 // then print the caller of Class.forName. If this is Class.loadClass, then print 164 // that caller, otherwise keep quiet since this should be picked up elsewhere. 165 bool found_it = false; 166 if (!vfst.at_end() && 167 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 168 vfst.method()->name() == vmSymbols::forName0_name()) { 169 vfst.next(); 170 if (!vfst.at_end() && 171 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 172 vfst.method()->name() == vmSymbols::forName_name()) { 173 vfst.next(); 174 found_it = true; 175 } 176 } else if (last_caller != NULL && 177 last_caller->method_holder()->name() == 178 vmSymbols::java_lang_ClassLoader() && 179 (last_caller->name() == vmSymbols::loadClassInternal_name() || 180 last_caller->name() == vmSymbols::loadClass_name())) { 181 found_it = true; 182 } else if (!vfst.at_end()) { 183 if (vfst.method()->is_native()) { 184 // JNI call 185 found_it = true; 186 } 187 } 188 if (found_it && !vfst.at_end()) { 189 // found the caller 190 caller = vfst.method()->method_holder(); 191 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 192 if (line_number == -1) { 193 // show method name if it's a native method 194 trace = vfst.method()->name_and_sig_as_C_string(); 195 } 196 Symbol* s = caller->source_file_name(); 197 if (s != NULL) { 198 source_file = s->as_C_string(); 199 } 200 } 201 } 202 if (caller != NULL) { 203 if (to_class != caller) { 204 const char * from = caller->external_name(); 205 const char * to = to_class->external_name(); 206 // print in a single call to reduce interleaving between threads 207 if (source_file != NULL) { 208 tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace); 209 } else { 210 tty->print("RESOLVE %s %s (%s)\n", from, to, trace); 211 } 212 } 213 } 214 } 215 216 void trace_class_resolution(Klass* to_class) { 217 EXCEPTION_MARK; 218 trace_class_resolution_impl(to_class, THREAD); 219 if (HAS_PENDING_EXCEPTION) { 220 CLEAR_PENDING_EXCEPTION; 221 } 222 } 223 224 // Wrapper to trace JVM functions 225 226 #ifdef ASSERT 227 class JVMTraceWrapper : public StackObj { 228 public: 229 JVMTraceWrapper(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) { 230 if (TraceJVMCalls) { 231 va_list ap; 232 va_start(ap, format); 233 tty->print("JVM "); 234 tty->vprint_cr(format, ap); 235 va_end(ap); 236 } 237 } 238 }; 239 240 Histogram* JVMHistogram; 241 volatile jint JVMHistogram_lock = 0; 242 243 class JVMHistogramElement : public HistogramElement { 244 public: 245 JVMHistogramElement(const char* name); 246 }; 247 248 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 249 _name = elementName; 250 uintx count = 0; 251 252 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 253 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 254 count +=1; 255 if ( (WarnOnStalledSpinLock > 0) 256 && (count % WarnOnStalledSpinLock == 0)) { 257 warning("JVMHistogram_lock seems to be stalled"); 258 } 259 } 260 } 261 262 if(JVMHistogram == NULL) 263 JVMHistogram = new Histogram("JVM Call Counts",100); 264 265 JVMHistogram->add_element(this); 266 Atomic::dec(&JVMHistogram_lock); 267 } 268 269 #define JVMCountWrapper(arg) \ 270 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 271 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 272 273 #define JVMWrapper(arg1) JVMCountWrapper(arg1); JVMTraceWrapper(arg1) 274 #define JVMWrapper2(arg1, arg2) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2) 275 #define JVMWrapper3(arg1, arg2, arg3) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3) 276 #define JVMWrapper4(arg1, arg2, arg3, arg4) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3, arg4) 277 #else 278 #define JVMWrapper(arg1) 279 #define JVMWrapper2(arg1, arg2) 280 #define JVMWrapper3(arg1, arg2, arg3) 281 #define JVMWrapper4(arg1, arg2, arg3, arg4) 282 #endif 283 284 285 // Interface version ///////////////////////////////////////////////////////////////////// 286 287 288 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 289 return JVM_INTERFACE_VERSION; 290 JVM_END 291 292 293 // java.lang.System ////////////////////////////////////////////////////////////////////// 294 295 296 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 297 JVMWrapper("JVM_CurrentTimeMillis"); 298 return os::javaTimeMillis(); 299 JVM_END 300 301 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 302 JVMWrapper("JVM_NanoTime"); 303 return os::javaTimeNanos(); 304 JVM_END 305 306 // The function below is actually exposed by sun.misc.VM and not 307 // java.lang.System, but we choose to keep it here so that it stays next 308 // to JVM_CurrentTimeMillis and JVM_NanoTime 309 310 const jlong MAX_DIFF_SECS = 0x0100000000LL; // 2^32 311 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 312 313 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 314 JVMWrapper("JVM_GetNanoTimeAdjustment"); 315 jlong seconds; 316 jlong nanos; 317 318 os::javaTimeSystemUTC(seconds, nanos); 319 320 // We're going to verify that the result can fit in a long. 321 // For that we need the difference in seconds between 'seconds' 322 // and 'offset_secs' to be such that: 323 // |seconds - offset_secs| < (2^63/10^9) 324 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 325 // which makes |seconds - offset_secs| < 2^33 326 // and we will prefer +/- 2^32 as the maximum acceptable diff 327 // as 2^32 has a more natural feel than 2^33... 328 // 329 // So if |seconds - offset_secs| >= 2^32 - we return a special 330 // sentinel value (-1) which the caller should take as an 331 // exception value indicating that the offset given to us is 332 // too far from range of the current time - leading to too big 333 // a nano adjustment. The caller is expected to recover by 334 // computing a more accurate offset and calling this method 335 // again. (For the record 2^32 secs is ~136 years, so that 336 // should rarely happen) 337 // 338 jlong diff = seconds - offset_secs; 339 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 340 return -1; // sentinel value: the offset is too far off the target 341 } 342 343 // return the adjustment. If you compute a time by adding 344 // this number of nanoseconds along with the number of seconds 345 // in the offset you should get the current UTC time. 346 return (diff * (jlong)1000000000) + nanos; 347 JVM_END 348 349 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 350 jobject dst, jint dst_pos, jint length)) 351 JVMWrapper("JVM_ArrayCopy"); 352 // Check if we have null pointers 353 if (src == NULL || dst == NULL) { 354 THROW(vmSymbols::java_lang_NullPointerException()); 355 } 356 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 357 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 358 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop"); 359 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop"); 360 // Do copy 361 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 362 JVM_END 363 364 365 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 366 JavaValue r(T_OBJECT); 367 // public synchronized Object put(Object key, Object value); 368 HandleMark hm(THREAD); 369 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 370 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 371 JavaCalls::call_virtual(&r, 372 props, 373 KlassHandle(THREAD, SystemDictionary::Properties_klass()), 374 vmSymbols::put_name(), 375 vmSymbols::object_object_object_signature(), 376 key_str, 377 value_str, 378 THREAD); 379 } 380 381 382 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 383 384 385 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 386 JVMWrapper("JVM_InitProperties"); 387 ResourceMark rm; 388 389 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 390 391 // System property list includes both user set via -D option and 392 // jvm system specific properties. 393 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 394 PUTPROP(props, p->key(), p->value()); 395 } 396 397 // Convert the -XX:MaxDirectMemorySize= command line flag 398 // to the sun.nio.MaxDirectMemorySize property. 399 // Do this after setting user properties to prevent people 400 // from setting the value with a -D option, as requested. 401 { 402 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 403 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 404 } else { 405 char as_chars[256]; 406 jio_snprintf(as_chars, sizeof(as_chars), UINTX_FORMAT, MaxDirectMemorySize); 407 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 408 } 409 } 410 411 // JVM monitoring and management support 412 // Add the sun.management.compiler property for the compiler's name 413 { 414 #undef CSIZE 415 #if defined(_LP64) || defined(_WIN64) 416 #define CSIZE "64-Bit " 417 #else 418 #define CSIZE 419 #endif // 64bit 420 421 #ifdef TIERED 422 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 423 #else 424 #if defined(COMPILER1) 425 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 426 #elif defined(COMPILER2) 427 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 428 #else 429 const char* compiler_name = ""; 430 #endif // compilers 431 #endif // TIERED 432 433 if (*compiler_name != '\0' && 434 (Arguments::mode() != Arguments::_int)) { 435 PUTPROP(props, "sun.management.compiler", compiler_name); 436 } 437 } 438 439 return properties; 440 JVM_END 441 442 443 /* 444 * Return the temporary directory that the VM uses for the attach 445 * and perf data files. 446 * 447 * It is important that this directory is well-known and the 448 * same for all VM instances. It cannot be affected by configuration 449 * variables such as java.io.tmpdir. 450 */ 451 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 452 JVMWrapper("JVM_GetTemporaryDirectory"); 453 HandleMark hm(THREAD); 454 const char* temp_dir = os::get_temp_directory(); 455 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 456 return (jstring) JNIHandles::make_local(env, h()); 457 JVM_END 458 459 460 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 461 462 extern volatile jint vm_created; 463 464 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 465 before_exit(thread); 466 vm_exit(code); 467 JVM_END 468 469 470 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 471 JVMWrapper("JVM_GC"); 472 if (!DisableExplicitGC) { 473 Universe::heap()->collect(GCCause::_java_lang_system_gc); 474 } 475 JVM_END 476 477 478 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 479 JVMWrapper("JVM_MaxObjectInspectionAge"); 480 return Universe::heap()->millis_since_last_gc(); 481 JVM_END 482 483 484 static inline jlong convert_size_t_to_jlong(size_t val) { 485 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 486 NOT_LP64 (return (jlong)val;) 487 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 488 } 489 490 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 491 JVMWrapper("JVM_TotalMemory"); 492 size_t n = Universe::heap()->capacity(); 493 return convert_size_t_to_jlong(n); 494 JVM_END 495 496 497 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 498 JVMWrapper("JVM_FreeMemory"); 499 CollectedHeap* ch = Universe::heap(); 500 size_t n; 501 { 502 MutexLocker x(Heap_lock); 503 n = ch->capacity() - ch->used(); 504 } 505 return convert_size_t_to_jlong(n); 506 JVM_END 507 508 509 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 510 JVMWrapper("JVM_MaxMemory"); 511 size_t n = Universe::heap()->max_capacity(); 512 return convert_size_t_to_jlong(n); 513 JVM_END 514 515 516 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 517 JVMWrapper("JVM_ActiveProcessorCount"); 518 return os::active_processor_count(); 519 JVM_END 520 521 522 523 // java.lang.Throwable ////////////////////////////////////////////////////// 524 525 526 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 527 JVMWrapper("JVM_FillInStackTrace"); 528 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 529 java_lang_Throwable::fill_in_stack_trace(exception); 530 JVM_END 531 532 533 JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable)) 534 JVMWrapper("JVM_GetStackTraceDepth"); 535 oop exception = JNIHandles::resolve(throwable); 536 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD); 537 JVM_END 538 539 540 JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index)) 541 JVMWrapper("JVM_GetStackTraceElement"); 542 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC 543 oop exception = JNIHandles::resolve(throwable); 544 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL); 545 return JNIHandles::make_local(env, element); 546 JVM_END 547 548 549 // java.lang.Object /////////////////////////////////////////////// 550 551 552 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 553 JVMWrapper("JVM_IHashCode"); 554 // as implemented in the classic virtual machine; return 0 if object is NULL 555 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 556 JVM_END 557 558 559 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 560 JVMWrapper("JVM_MonitorWait"); 561 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 562 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 563 if (JvmtiExport::should_post_monitor_wait()) { 564 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 565 566 // The current thread already owns the monitor and it has not yet 567 // been added to the wait queue so the current thread cannot be 568 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 569 // event handler cannot accidentally consume an unpark() meant for 570 // the ParkEvent associated with this ObjectMonitor. 571 } 572 ObjectSynchronizer::wait(obj, ms, CHECK); 573 JVM_END 574 575 576 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 577 JVMWrapper("JVM_MonitorNotify"); 578 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 579 ObjectSynchronizer::notify(obj, CHECK); 580 JVM_END 581 582 583 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 584 JVMWrapper("JVM_MonitorNotifyAll"); 585 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 586 ObjectSynchronizer::notifyall(obj, CHECK); 587 JVM_END 588 589 590 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 591 JVMWrapper("JVM_Clone"); 592 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 593 const KlassHandle klass (THREAD, obj->klass()); 594 JvmtiVMObjectAllocEventCollector oam; 595 596 #ifdef ASSERT 597 // Just checking that the cloneable flag is set correct 598 if (obj->is_array()) { 599 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 600 } else { 601 guarantee(obj->is_instance(), "should be instanceOop"); 602 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 603 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 604 } 605 #endif 606 607 // Check if class of obj supports the Cloneable interface. 608 // All arrays are considered to be cloneable (See JLS 20.1.5) 609 if (!klass->is_cloneable()) { 610 ResourceMark rm(THREAD); 611 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 612 } 613 614 // Make shallow object copy 615 const int size = obj->size(); 616 oop new_obj_oop = NULL; 617 if (obj->is_array()) { 618 const int length = ((arrayOop)obj())->length(); 619 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 620 } else { 621 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 622 } 623 624 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread 625 // is modifying a reference field in the clonee, a non-oop-atomic copy might 626 // be suspended in the middle of copying the pointer and end up with parts 627 // of two different pointers in the field. Subsequent dereferences will crash. 628 // 4846409: an oop-copy of objects with long or double fields or arrays of same 629 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead 630 // of oops. We know objects are aligned on a minimum of an jlong boundary. 631 // The same is true of StubRoutines::object_copy and the various oop_copy 632 // variants, and of the code generated by the inline_native_clone intrinsic. 633 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); 634 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop, 635 (size_t)align_object_size(size) / HeapWordsPerLong); 636 // Clear the header 637 new_obj_oop->init_mark(); 638 639 // Store check (mark entire object and let gc sort it out) 640 BarrierSet* bs = Universe::heap()->barrier_set(); 641 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); 642 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); 643 644 Handle new_obj(THREAD, new_obj_oop); 645 // Special handling for MemberNames. Since they contain Method* metadata, they 646 // must be registered so that RedefineClasses can fix metadata contained in them. 647 if (java_lang_invoke_MemberName::is_instance(new_obj()) && 648 java_lang_invoke_MemberName::is_method(new_obj())) { 649 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj()); 650 // MemberName may be unresolved, so doesn't need registration until resolved. 651 if (method != NULL) { 652 methodHandle m(THREAD, method); 653 // This can safepoint and redefine method, so need both new_obj and method 654 // in a handle, for two different reasons. new_obj can move, method can be 655 // deleted if nothing is using it on the stack. 656 m->method_holder()->add_member_name(new_obj()); 657 } 658 } 659 660 // Caution: this involves a java upcall, so the clone should be 661 // "gc-robust" by this stage. 662 if (klass->has_finalizer()) { 663 assert(obj->is_instance(), "should be instanceOop"); 664 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 665 new_obj = Handle(THREAD, new_obj_oop); 666 } 667 668 return JNIHandles::make_local(env, new_obj()); 669 JVM_END 670 671 // java.io.File /////////////////////////////////////////////////////////////// 672 673 JVM_LEAF(char*, JVM_NativePath(char* path)) 674 JVMWrapper2("JVM_NativePath (%s)", path); 675 return os::native_path(path); 676 JVM_END 677 678 679 // Misc. class handling /////////////////////////////////////////////////////////// 680 681 682 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 683 JVMWrapper("JVM_GetCallerClass"); 684 685 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 686 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 687 // temporarily for existing code to use until a replacement API is defined. 688 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 689 Klass* k = thread->security_get_caller_class(depth); 690 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 691 } 692 693 // Getting the class of the caller frame. 694 // 695 // The call stack at this point looks something like this: 696 // 697 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 698 // [1] [ @CallerSensitive API.method ] 699 // [.] [ (skipped intermediate frames) ] 700 // [n] [ caller ] 701 vframeStream vfst(thread); 702 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 703 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 704 Method* m = vfst.method(); 705 assert(m != NULL, "sanity"); 706 switch (n) { 707 case 0: 708 // This must only be called from Reflection.getCallerClass 709 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 710 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 711 } 712 // fall-through 713 case 1: 714 // Frame 0 and 1 must be caller sensitive. 715 if (!m->caller_sensitive()) { 716 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 717 } 718 break; 719 default: 720 if (!m->is_ignored_by_security_stack_walk()) { 721 // We have reached the desired frame; return the holder class. 722 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 723 } 724 break; 725 } 726 } 727 return NULL; 728 JVM_END 729 730 731 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 732 JVMWrapper("JVM_FindPrimitiveClass"); 733 oop mirror = NULL; 734 BasicType t = name2type(utf); 735 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 736 mirror = Universe::java_mirror(t); 737 } 738 if (mirror == NULL) { 739 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 740 } else { 741 return (jclass) JNIHandles::make_local(env, mirror); 742 } 743 JVM_END 744 745 746 // Returns a class loaded by the bootstrap class loader; or null 747 // if not found. ClassNotFoundException is not thrown. 748 // FindClassFromBootLoader is exported to the launcher for windows. 749 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 750 const char* name)) 751 JVMWrapper2("JVM_FindClassFromBootLoader %s", name); 752 753 // Java libraries should ensure that name is never null... 754 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 755 // It's impossible to create this class; the name cannot fit 756 // into the constant pool. 757 return NULL; 758 } 759 760 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 761 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 762 if (k == NULL) { 763 return NULL; 764 } 765 766 if (TraceClassResolution) { 767 trace_class_resolution(k); 768 } 769 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 770 JVM_END 771 772 // Find a class with this name in this loader, using the caller's protection domain. 773 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 774 jboolean init, jobject loader, 775 jclass caller)) 776 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name); 777 // Java libraries should ensure that name is never null... 778 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 779 // It's impossible to create this class; the name cannot fit 780 // into the constant pool. 781 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 782 } 783 784 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 785 786 oop loader_oop = JNIHandles::resolve(loader); 787 oop from_class = JNIHandles::resolve(caller); 788 oop protection_domain = NULL; 789 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 790 // NPE. Put it in another way, the bootstrap class loader has all permission and 791 // thus no checkPackageAccess equivalence in the VM class loader. 792 // The caller is also passed as NULL by the java code if there is no security 793 // manager to avoid the performance cost of getting the calling class. 794 if (from_class != NULL && loader_oop != NULL) { 795 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 796 } 797 798 Handle h_loader(THREAD, loader_oop); 799 Handle h_prot(THREAD, protection_domain); 800 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 801 h_prot, false, THREAD); 802 803 if (TraceClassResolution && result != NULL) { 804 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 805 } 806 return result; 807 JVM_END 808 809 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 810 jboolean init, jclass from)) 811 JVMWrapper2("JVM_FindClassFromClass %s", name); 812 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 813 // It's impossible to create this class; the name cannot fit 814 // into the constant pool. 815 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 816 } 817 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 818 oop from_class_oop = JNIHandles::resolve(from); 819 Klass* from_class = (from_class_oop == NULL) 820 ? (Klass*)NULL 821 : java_lang_Class::as_Klass(from_class_oop); 822 oop class_loader = NULL; 823 oop protection_domain = NULL; 824 if (from_class != NULL) { 825 class_loader = from_class->class_loader(); 826 protection_domain = from_class->protection_domain(); 827 } 828 Handle h_loader(THREAD, class_loader); 829 Handle h_prot (THREAD, protection_domain); 830 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 831 h_prot, true, thread); 832 833 if (TraceClassResolution && result != NULL) { 834 // this function is generally only used for class loading during verification. 835 ResourceMark rm; 836 oop from_mirror = JNIHandles::resolve_non_null(from); 837 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 838 const char * from_name = from_class->external_name(); 839 840 oop mirror = JNIHandles::resolve_non_null(result); 841 Klass* to_class = java_lang_Class::as_Klass(mirror); 842 const char * to = to_class->external_name(); 843 tty->print("RESOLVE %s %s (verification)\n", from_name, to); 844 } 845 846 return result; 847 JVM_END 848 849 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 850 if (loader.is_null()) { 851 return; 852 } 853 854 // check whether the current caller thread holds the lock or not. 855 // If not, increment the corresponding counter 856 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 857 ObjectSynchronizer::owner_self) { 858 counter->inc(); 859 } 860 } 861 862 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 863 // and JVM_DefineClassWithSourceCond() 864 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 865 jobject loader, const jbyte *buf, 866 jsize len, jobject pd, const char *source, 867 jboolean verify, TRAPS) { 868 if (source == NULL) source = "__JVM_DefineClass__"; 869 870 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 871 JavaThread* jt = (JavaThread*) THREAD; 872 873 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 874 ClassLoader::perf_define_appclass_selftime(), 875 ClassLoader::perf_define_appclasses(), 876 jt->get_thread_stat()->perf_recursion_counts_addr(), 877 jt->get_thread_stat()->perf_timers_addr(), 878 PerfClassTraceTime::DEFINE_CLASS); 879 880 if (UsePerfData) { 881 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 882 } 883 884 // Since exceptions can be thrown, class initialization can take place 885 // if name is NULL no check for class name in .class stream has to be made. 886 TempNewSymbol class_name = NULL; 887 if (name != NULL) { 888 const int str_len = (int)strlen(name); 889 if (str_len > Symbol::max_length()) { 890 // It's impossible to create this class; the name cannot fit 891 // into the constant pool. 892 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 893 } 894 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 895 } 896 897 ResourceMark rm(THREAD); 898 ClassFileStream st((u1*) buf, len, (char *)source); 899 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 900 if (UsePerfData) { 901 is_lock_held_by_thread(class_loader, 902 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 903 THREAD); 904 } 905 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 906 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader, 907 protection_domain, &st, 908 verify != 0, 909 CHECK_NULL); 910 911 if (TraceClassResolution && k != NULL) { 912 trace_class_resolution(k); 913 } 914 915 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 916 } 917 918 919 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 920 JVMWrapper2("JVM_DefineClass %s", name); 921 922 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD); 923 JVM_END 924 925 926 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 927 JVMWrapper2("JVM_DefineClassWithSource %s", name); 928 929 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD); 930 JVM_END 931 932 JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name, 933 jobject loader, const jbyte *buf, 934 jsize len, jobject pd, 935 const char *source, jboolean verify)) 936 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name); 937 938 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD); 939 JVM_END 940 941 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 942 JVMWrapper("JVM_FindLoadedClass"); 943 ResourceMark rm(THREAD); 944 945 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 946 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 947 948 const char* str = java_lang_String::as_utf8_string(string()); 949 // Sanity check, don't expect null 950 if (str == NULL) return NULL; 951 952 const int str_len = (int)strlen(str); 953 if (str_len > Symbol::max_length()) { 954 // It's impossible to create this class; the name cannot fit 955 // into the constant pool. 956 return NULL; 957 } 958 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 959 960 // Security Note: 961 // The Java level wrapper will perform the necessary security check allowing 962 // us to pass the NULL as the initiating class loader. 963 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 964 if (UsePerfData) { 965 is_lock_held_by_thread(h_loader, 966 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 967 THREAD); 968 } 969 970 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 971 h_loader, 972 Handle(), 973 CHECK_NULL); 974 #if INCLUDE_CDS 975 if (k == NULL) { 976 // If the class is not already loaded, try to see if it's in the shared 977 // archive for the current classloader (h_loader). 978 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class( 979 klass_name, h_loader, CHECK_NULL); 980 k = ik(); 981 } 982 #endif 983 return (k == NULL) ? NULL : 984 (jclass) JNIHandles::make_local(env, k->java_mirror()); 985 JVM_END 986 987 988 // Reflection support ////////////////////////////////////////////////////////////////////////////// 989 990 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 991 assert (cls != NULL, "illegal class"); 992 JVMWrapper("JVM_GetClassName"); 993 JvmtiVMObjectAllocEventCollector oam; 994 ResourceMark rm(THREAD); 995 const char* name; 996 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 997 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 998 } else { 999 // Consider caching interned string in Klass 1000 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1001 assert(k->is_klass(), "just checking"); 1002 name = k->external_name(); 1003 } 1004 oop result = StringTable::intern((char*) name, CHECK_NULL); 1005 return (jstring) JNIHandles::make_local(env, result); 1006 JVM_END 1007 1008 1009 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1010 JVMWrapper("JVM_GetClassInterfaces"); 1011 JvmtiVMObjectAllocEventCollector oam; 1012 oop mirror = JNIHandles::resolve_non_null(cls); 1013 1014 // Special handling for primitive objects 1015 if (java_lang_Class::is_primitive(mirror)) { 1016 // Primitive objects does not have any interfaces 1017 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1018 return (jobjectArray) JNIHandles::make_local(env, r); 1019 } 1020 1021 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror)); 1022 // Figure size of result array 1023 int size; 1024 if (klass->oop_is_instance()) { 1025 size = InstanceKlass::cast(klass())->local_interfaces()->length(); 1026 } else { 1027 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass"); 1028 size = 2; 1029 } 1030 1031 // Allocate result array 1032 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1033 objArrayHandle result (THREAD, r); 1034 // Fill in result 1035 if (klass->oop_is_instance()) { 1036 // Regular instance klass, fill in all local interfaces 1037 for (int index = 0; index < size; index++) { 1038 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index); 1039 result->obj_at_put(index, k->java_mirror()); 1040 } 1041 } else { 1042 // All arrays implement java.lang.Cloneable and java.io.Serializable 1043 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1044 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1045 } 1046 return (jobjectArray) JNIHandles::make_local(env, result()); 1047 JVM_END 1048 1049 1050 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1051 JVMWrapper("JVM_IsInterface"); 1052 oop mirror = JNIHandles::resolve_non_null(cls); 1053 if (java_lang_Class::is_primitive(mirror)) { 1054 return JNI_FALSE; 1055 } 1056 Klass* k = java_lang_Class::as_Klass(mirror); 1057 jboolean result = k->is_interface(); 1058 assert(!result || k->oop_is_instance(), 1059 "all interfaces are instance types"); 1060 // The compiler intrinsic for isInterface tests the 1061 // Klass::_access_flags bits in the same way. 1062 return result; 1063 JVM_END 1064 1065 1066 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1067 JVMWrapper("JVM_GetClassSigners"); 1068 JvmtiVMObjectAllocEventCollector oam; 1069 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1070 // There are no signers for primitive types 1071 return NULL; 1072 } 1073 1074 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1075 1076 // If there are no signers set in the class, or if the class 1077 // is an array, return NULL. 1078 if (signers == NULL) return NULL; 1079 1080 // copy of the signers array 1081 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1082 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1083 for (int index = 0; index < signers->length(); index++) { 1084 signers_copy->obj_at_put(index, signers->obj_at(index)); 1085 } 1086 1087 // return the copy 1088 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1089 JVM_END 1090 1091 1092 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1093 JVMWrapper("JVM_SetClassSigners"); 1094 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1095 // This call is ignored for primitive types and arrays. 1096 // Signers are only set once, ClassLoader.java, and thus shouldn't 1097 // be called with an array. Only the bootstrap loader creates arrays. 1098 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1099 if (k->oop_is_instance()) { 1100 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1101 } 1102 } 1103 JVM_END 1104 1105 1106 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1107 JVMWrapper("JVM_GetProtectionDomain"); 1108 if (JNIHandles::resolve(cls) == NULL) { 1109 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1110 } 1111 1112 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1113 // Primitive types does not have a protection domain. 1114 return NULL; 1115 } 1116 1117 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1118 return (jobject) JNIHandles::make_local(env, pd); 1119 JVM_END 1120 1121 1122 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) { 1123 // If there is a security manager and protection domain, check the access 1124 // in the protection domain, otherwise it is authorized. 1125 if (java_lang_System::has_security_manager()) { 1126 1127 // For bootstrapping, if pd implies method isn't in the JDK, allow 1128 // this context to revert to older behavior. 1129 // In this case the isAuthorized field in AccessControlContext is also not 1130 // present. 1131 if (Universe::protection_domain_implies_method() == NULL) { 1132 return true; 1133 } 1134 1135 // Whitelist certain access control contexts 1136 if (java_security_AccessControlContext::is_authorized(context)) { 1137 return true; 1138 } 1139 1140 oop prot = klass->protection_domain(); 1141 if (prot != NULL) { 1142 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1143 // in the new wrapper. 1144 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1145 Handle h_prot(THREAD, prot); 1146 JavaValue result(T_BOOLEAN); 1147 JavaCallArguments args(h_prot); 1148 JavaCalls::call(&result, m, &args, CHECK_false); 1149 return (result.get_jboolean() != 0); 1150 } 1151 } 1152 return true; 1153 } 1154 1155 // Create an AccessControlContext with a protection domain with null codesource 1156 // and null permissions - which gives no permissions. 1157 oop create_dummy_access_control_context(TRAPS) { 1158 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass()); 1159 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1160 // Call constructor ProtectionDomain(null, null); 1161 JavaValue result(T_VOID); 1162 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass), 1163 vmSymbols::object_initializer_name(), 1164 vmSymbols::codesource_permissioncollection_signature(), 1165 Handle(), Handle(), CHECK_NULL); 1166 1167 // new ProtectionDomain[] {pd}; 1168 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1169 context->obj_at_put(0, obj()); 1170 1171 // new AccessControlContext(new ProtectionDomain[] {pd}) 1172 objArrayHandle h_context(THREAD, context); 1173 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1174 return acc; 1175 } 1176 1177 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1178 JVMWrapper("JVM_DoPrivileged"); 1179 1180 if (action == NULL) { 1181 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1182 } 1183 1184 // Compute the frame initiating the do privileged operation and setup the privileged stack 1185 vframeStream vfst(thread); 1186 vfst.security_get_caller_frame(1); 1187 1188 if (vfst.at_end()) { 1189 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1190 } 1191 1192 Method* method = vfst.method(); 1193 instanceKlassHandle klass (THREAD, method->method_holder()); 1194 1195 // Check that action object understands "Object run()" 1196 Handle h_context; 1197 if (context != NULL) { 1198 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1199 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1200 if (!authorized) { 1201 // Create an unprivileged access control object and call it's run function 1202 // instead. 1203 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1204 h_context = Handle(THREAD, noprivs); 1205 } 1206 } 1207 1208 // Check that action object understands "Object run()" 1209 Handle object (THREAD, JNIHandles::resolve(action)); 1210 1211 // get run() method 1212 Method* m_oop = object->klass()->uncached_lookup_method( 1213 vmSymbols::run_method_name(), 1214 vmSymbols::void_object_signature(), 1215 Klass::find_overpass); 1216 methodHandle m (THREAD, m_oop); 1217 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { 1218 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1219 } 1220 1221 // Stack allocated list of privileged stack elements 1222 PrivilegedElement pi; 1223 if (!vfst.at_end()) { 1224 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1225 thread->set_privileged_stack_top(&pi); 1226 } 1227 1228 1229 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1230 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1231 Handle pending_exception; 1232 JavaValue result(T_OBJECT); 1233 JavaCallArguments args(object); 1234 JavaCalls::call(&result, m, &args, THREAD); 1235 1236 // done with action, remove ourselves from the list 1237 if (!vfst.at_end()) { 1238 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1239 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1240 } 1241 1242 if (HAS_PENDING_EXCEPTION) { 1243 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1244 CLEAR_PENDING_EXCEPTION; 1245 // JVMTI has already reported the pending exception 1246 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1247 if (THREAD->is_Java_thread()) { 1248 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1249 } 1250 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1251 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1252 // Throw a java.security.PrivilegedActionException(Exception e) exception 1253 JavaCallArguments args(pending_exception); 1254 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1255 vmSymbols::exception_void_signature(), 1256 &args); 1257 } 1258 } 1259 1260 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1261 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1262 JVM_END 1263 1264 1265 // Returns the inherited_access_control_context field of the running thread. 1266 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1267 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1268 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1269 return JNIHandles::make_local(env, result); 1270 JVM_END 1271 1272 class RegisterArrayForGC { 1273 private: 1274 JavaThread *_thread; 1275 public: 1276 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1277 _thread = thread; 1278 _thread->register_array_for_gc(array); 1279 } 1280 1281 ~RegisterArrayForGC() { 1282 _thread->register_array_for_gc(NULL); 1283 } 1284 }; 1285 1286 1287 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1288 JVMWrapper("JVM_GetStackAccessControlContext"); 1289 if (!UsePrivilegedStack) return NULL; 1290 1291 ResourceMark rm(THREAD); 1292 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1293 JvmtiVMObjectAllocEventCollector oam; 1294 1295 // count the protection domains on the execution stack. We collapse 1296 // duplicate consecutive protection domains into a single one, as 1297 // well as stopping when we hit a privileged frame. 1298 1299 // Use vframeStream to iterate through Java frames 1300 vframeStream vfst(thread); 1301 1302 oop previous_protection_domain = NULL; 1303 Handle privileged_context(thread, NULL); 1304 bool is_privileged = false; 1305 oop protection_domain = NULL; 1306 1307 for(; !vfst.at_end(); vfst.next()) { 1308 // get method of frame 1309 Method* method = vfst.method(); 1310 intptr_t* frame_id = vfst.frame_id(); 1311 1312 // check the privileged frames to see if we have a match 1313 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1314 // this frame is privileged 1315 is_privileged = true; 1316 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1317 protection_domain = thread->privileged_stack_top()->protection_domain(); 1318 } else { 1319 protection_domain = method->method_holder()->protection_domain(); 1320 } 1321 1322 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1323 local_array->push(protection_domain); 1324 previous_protection_domain = protection_domain; 1325 } 1326 1327 if (is_privileged) break; 1328 } 1329 1330 1331 // either all the domains on the stack were system domains, or 1332 // we had a privileged system domain 1333 if (local_array->is_empty()) { 1334 if (is_privileged && privileged_context.is_null()) return NULL; 1335 1336 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1337 return JNIHandles::make_local(env, result); 1338 } 1339 1340 // the resource area must be registered in case of a gc 1341 RegisterArrayForGC ragc(thread, local_array); 1342 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1343 local_array->length(), CHECK_NULL); 1344 objArrayHandle h_context(thread, context); 1345 for (int index = 0; index < local_array->length(); index++) { 1346 h_context->obj_at_put(index, local_array->at(index)); 1347 } 1348 1349 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1350 1351 return JNIHandles::make_local(env, result); 1352 JVM_END 1353 1354 1355 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1356 JVMWrapper("JVM_IsArrayClass"); 1357 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1358 return (k != NULL) && k->oop_is_array() ? true : false; 1359 JVM_END 1360 1361 1362 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1363 JVMWrapper("JVM_IsPrimitiveClass"); 1364 oop mirror = JNIHandles::resolve_non_null(cls); 1365 return (jboolean) java_lang_Class::is_primitive(mirror); 1366 JVM_END 1367 1368 1369 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1370 JVMWrapper("JVM_GetClassModifiers"); 1371 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1372 // Primitive type 1373 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1374 } 1375 1376 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1377 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1378 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1379 return k->modifier_flags(); 1380 JVM_END 1381 1382 1383 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1384 1385 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1386 JvmtiVMObjectAllocEventCollector oam; 1387 // ofClass is a reference to a java_lang_Class object. The mirror object 1388 // of an InstanceKlass 1389 1390 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1391 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1392 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1393 return (jobjectArray)JNIHandles::make_local(env, result); 1394 } 1395 1396 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1397 InnerClassesIterator iter(k); 1398 1399 if (iter.length() == 0) { 1400 // Neither an inner nor outer class 1401 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1402 return (jobjectArray)JNIHandles::make_local(env, result); 1403 } 1404 1405 // find inner class info 1406 constantPoolHandle cp(thread, k->constants()); 1407 int length = iter.length(); 1408 1409 // Allocate temp. result array 1410 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1411 objArrayHandle result (THREAD, r); 1412 int members = 0; 1413 1414 for (; !iter.done(); iter.next()) { 1415 int ioff = iter.inner_class_info_index(); 1416 int ooff = iter.outer_class_info_index(); 1417 1418 if (ioff != 0 && ooff != 0) { 1419 // Check to see if the name matches the class we're looking for 1420 // before attempting to find the class. 1421 if (cp->klass_name_at_matches(k, ooff)) { 1422 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1423 if (outer_klass == k()) { 1424 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1425 instanceKlassHandle inner_klass (THREAD, ik); 1426 1427 // Throws an exception if outer klass has not declared k as 1428 // an inner klass 1429 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1430 1431 result->obj_at_put(members, inner_klass->java_mirror()); 1432 members++; 1433 } 1434 } 1435 } 1436 } 1437 1438 if (members != length) { 1439 // Return array of right length 1440 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1441 for(int i = 0; i < members; i++) { 1442 res->obj_at_put(i, result->obj_at(i)); 1443 } 1444 return (jobjectArray)JNIHandles::make_local(env, res); 1445 } 1446 1447 return (jobjectArray)JNIHandles::make_local(env, result()); 1448 JVM_END 1449 1450 1451 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1452 { 1453 // ofClass is a reference to a java_lang_Class object. 1454 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1455 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1456 return NULL; 1457 } 1458 1459 bool inner_is_member = false; 1460 Klass* outer_klass 1461 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1462 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1463 if (outer_klass == NULL) return NULL; // already a top-level class 1464 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1465 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1466 } 1467 JVM_END 1468 1469 // should be in InstanceKlass.cpp, but is here for historical reasons 1470 Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle k, 1471 bool* inner_is_member, 1472 TRAPS) { 1473 Thread* thread = THREAD; 1474 InnerClassesIterator iter(k); 1475 if (iter.length() == 0) { 1476 // No inner class info => no declaring class 1477 return NULL; 1478 } 1479 1480 constantPoolHandle i_cp(thread, k->constants()); 1481 1482 bool found = false; 1483 Klass* ok; 1484 instanceKlassHandle outer_klass; 1485 *inner_is_member = false; 1486 1487 // Find inner_klass attribute 1488 for (; !iter.done() && !found; iter.next()) { 1489 int ioff = iter.inner_class_info_index(); 1490 int ooff = iter.outer_class_info_index(); 1491 int noff = iter.inner_name_index(); 1492 if (ioff != 0) { 1493 // Check to see if the name matches the class we're looking for 1494 // before attempting to find the class. 1495 if (i_cp->klass_name_at_matches(k, ioff)) { 1496 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_NULL); 1497 found = (k() == inner_klass); 1498 if (found && ooff != 0) { 1499 ok = i_cp->klass_at(ooff, CHECK_NULL); 1500 outer_klass = instanceKlassHandle(thread, ok); 1501 *inner_is_member = true; 1502 } 1503 } 1504 } 1505 } 1506 1507 if (found && outer_klass.is_null()) { 1508 // It may be anonymous; try for that. 1509 int encl_method_class_idx = k->enclosing_method_class_index(); 1510 if (encl_method_class_idx != 0) { 1511 ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL); 1512 outer_klass = instanceKlassHandle(thread, ok); 1513 *inner_is_member = false; 1514 } 1515 } 1516 1517 // If no inner class attribute found for this class. 1518 if (outer_klass.is_null()) return NULL; 1519 1520 // Throws an exception if outer klass has not declared k as an inner klass 1521 // We need evidence that each klass knows about the other, or else 1522 // the system could allow a spoof of an inner class to gain access rights. 1523 Reflection::check_for_inner_class(outer_klass, k, *inner_is_member, CHECK_NULL); 1524 return outer_klass(); 1525 } 1526 1527 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1528 assert (cls != NULL, "illegal class"); 1529 JVMWrapper("JVM_GetClassSignature"); 1530 JvmtiVMObjectAllocEventCollector oam; 1531 ResourceMark rm(THREAD); 1532 // Return null for arrays and primatives 1533 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1534 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1535 if (k->oop_is_instance()) { 1536 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1537 if (sym == NULL) return NULL; 1538 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1539 return (jstring) JNIHandles::make_local(env, str()); 1540 } 1541 } 1542 return NULL; 1543 JVM_END 1544 1545 1546 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1547 assert (cls != NULL, "illegal class"); 1548 JVMWrapper("JVM_GetClassAnnotations"); 1549 1550 // Return null for arrays and primitives 1551 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1552 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1553 if (k->oop_is_instance()) { 1554 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1555 return (jbyteArray) JNIHandles::make_local(env, a); 1556 } 1557 } 1558 return NULL; 1559 JVM_END 1560 1561 1562 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1563 // some of this code was adapted from from jni_FromReflectedField 1564 1565 oop reflected = JNIHandles::resolve_non_null(field); 1566 oop mirror = java_lang_reflect_Field::clazz(reflected); 1567 Klass* k = java_lang_Class::as_Klass(mirror); 1568 int slot = java_lang_reflect_Field::slot(reflected); 1569 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1570 1571 KlassHandle kh(THREAD, k); 1572 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot); 1573 1574 if (modifiers & JVM_ACC_STATIC) { 1575 // for static fields we only look in the current class 1576 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) { 1577 assert(false, "cannot find static field"); 1578 return false; 1579 } 1580 } else { 1581 // for instance fields we start with the current class and work 1582 // our way up through the superclass chain 1583 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) { 1584 assert(false, "cannot find instance field"); 1585 return false; 1586 } 1587 } 1588 return true; 1589 } 1590 1591 static Method* jvm_get_method_common(jobject method) { 1592 // some of this code was adapted from from jni_FromReflectedMethod 1593 1594 oop reflected = JNIHandles::resolve_non_null(method); 1595 oop mirror = NULL; 1596 int slot = 0; 1597 1598 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1599 mirror = java_lang_reflect_Constructor::clazz(reflected); 1600 slot = java_lang_reflect_Constructor::slot(reflected); 1601 } else { 1602 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1603 "wrong type"); 1604 mirror = java_lang_reflect_Method::clazz(reflected); 1605 slot = java_lang_reflect_Method::slot(reflected); 1606 } 1607 Klass* k = java_lang_Class::as_Klass(mirror); 1608 1609 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1610 assert(m != NULL, "cannot find method"); 1611 return m; // caller has to deal with NULL in product mode 1612 } 1613 1614 /* Type use annotations support (JDK 1.8) */ 1615 1616 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1617 assert (cls != NULL, "illegal class"); 1618 JVMWrapper("JVM_GetClassTypeAnnotations"); 1619 ResourceMark rm(THREAD); 1620 // Return null for arrays and primitives 1621 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1622 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1623 if (k->oop_is_instance()) { 1624 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1625 if (type_annotations != NULL) { 1626 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1627 return (jbyteArray) JNIHandles::make_local(env, a); 1628 } 1629 } 1630 } 1631 return NULL; 1632 JVM_END 1633 1634 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1635 assert (method != NULL, "illegal method"); 1636 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1637 1638 // method is a handle to a java.lang.reflect.Method object 1639 Method* m = jvm_get_method_common(method); 1640 if (m == NULL) { 1641 return NULL; 1642 } 1643 1644 AnnotationArray* type_annotations = m->type_annotations(); 1645 if (type_annotations != NULL) { 1646 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1647 return (jbyteArray) JNIHandles::make_local(env, a); 1648 } 1649 1650 return NULL; 1651 JVM_END 1652 1653 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1654 assert (field != NULL, "illegal field"); 1655 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1656 1657 fieldDescriptor fd; 1658 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1659 if (!gotFd) { 1660 return NULL; 1661 } 1662 1663 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1664 JVM_END 1665 1666 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { 1667 if (!cp->is_within_bounds(index)) { 1668 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1669 } 1670 } 1671 1672 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1673 { 1674 JVMWrapper("JVM_GetMethodParameters"); 1675 // method is a handle to a java.lang.reflect.Method object 1676 Method* method_ptr = jvm_get_method_common(method); 1677 methodHandle mh (THREAD, method_ptr); 1678 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1679 const int num_params = mh->method_parameters_length(); 1680 1681 if (num_params < 0) { 1682 // A -1 return value from method_parameters_length means there is no 1683 // parameter data. Return null to indicate this to the reflection 1684 // API. 1685 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1686 return (jobjectArray)NULL; 1687 } else { 1688 // Otherwise, we return something up to reflection, even if it is 1689 // a zero-length array. Why? Because in some cases this can 1690 // trigger a MalformedParametersException. 1691 1692 // make sure all the symbols are properly formatted 1693 for (int i = 0; i < num_params; i++) { 1694 MethodParametersElement* params = mh->method_parameters_start(); 1695 int index = params[i].name_cp_index; 1696 bounds_check(mh->constants(), index, CHECK_NULL); 1697 1698 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1699 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1700 "Wrong type at constant pool index"); 1701 } 1702 1703 } 1704 1705 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1706 objArrayHandle result (THREAD, result_oop); 1707 1708 for (int i = 0; i < num_params; i++) { 1709 MethodParametersElement* params = mh->method_parameters_start(); 1710 // For a 0 index, give a NULL symbol 1711 Symbol* sym = 0 != params[i].name_cp_index ? 1712 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1713 int flags = params[i].flags; 1714 oop param = Reflection::new_parameter(reflected_method, i, sym, 1715 flags, CHECK_NULL); 1716 result->obj_at_put(i, param); 1717 } 1718 return (jobjectArray)JNIHandles::make_local(env, result()); 1719 } 1720 } 1721 JVM_END 1722 1723 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1724 1725 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1726 { 1727 JVMWrapper("JVM_GetClassDeclaredFields"); 1728 JvmtiVMObjectAllocEventCollector oam; 1729 1730 // Exclude primitive types and array types 1731 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1732 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 1733 // Return empty array 1734 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1735 return (jobjectArray) JNIHandles::make_local(env, res); 1736 } 1737 1738 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1739 constantPoolHandle cp(THREAD, k->constants()); 1740 1741 // Ensure class is linked 1742 k->link_class(CHECK_NULL); 1743 1744 // 4496456 We need to filter out java.lang.Throwable.backtrace 1745 bool skip_backtrace = false; 1746 1747 // Allocate result 1748 int num_fields; 1749 1750 if (publicOnly) { 1751 num_fields = 0; 1752 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) { 1753 if (fs.access_flags().is_public()) ++num_fields; 1754 } 1755 } else { 1756 num_fields = k->java_fields_count(); 1757 1758 if (k() == SystemDictionary::Throwable_klass()) { 1759 num_fields--; 1760 skip_backtrace = true; 1761 } 1762 } 1763 1764 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1765 objArrayHandle result (THREAD, r); 1766 1767 int out_idx = 0; 1768 fieldDescriptor fd; 1769 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1770 if (skip_backtrace) { 1771 // 4496456 skip java.lang.Throwable.backtrace 1772 int offset = fs.offset(); 1773 if (offset == java_lang_Throwable::get_backtrace_offset()) continue; 1774 } 1775 1776 if (!publicOnly || fs.access_flags().is_public()) { 1777 fd.reinitialize(k(), fs.index()); 1778 oop field = Reflection::new_field(&fd, CHECK_NULL); 1779 result->obj_at_put(out_idx, field); 1780 ++out_idx; 1781 } 1782 } 1783 assert(out_idx == num_fields, "just checking"); 1784 return (jobjectArray) JNIHandles::make_local(env, result()); 1785 } 1786 JVM_END 1787 1788 static bool select_method(methodHandle method, bool want_constructor) { 1789 if (want_constructor) { 1790 return (method->is_initializer() && !method->is_static()); 1791 } else { 1792 return (!method->is_initializer() && !method->is_overpass()); 1793 } 1794 } 1795 1796 static jobjectArray get_class_declared_methods_helper( 1797 JNIEnv *env, 1798 jclass ofClass, jboolean publicOnly, 1799 bool want_constructor, 1800 Klass* klass, TRAPS) { 1801 1802 JvmtiVMObjectAllocEventCollector oam; 1803 1804 // Exclude primitive types and array types 1805 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1806 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 1807 // Return empty array 1808 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1809 return (jobjectArray) JNIHandles::make_local(env, res); 1810 } 1811 1812 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1813 1814 // Ensure class is linked 1815 k->link_class(CHECK_NULL); 1816 1817 Array<Method*>* methods = k->methods(); 1818 int methods_length = methods->length(); 1819 1820 // Save original method_idnum in case of redefinition, which can change 1821 // the idnum of obsolete methods. The new method will have the same idnum 1822 // but if we refresh the methods array, the counts will be wrong. 1823 ResourceMark rm(THREAD); 1824 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1825 int num_methods = 0; 1826 1827 for (int i = 0; i < methods_length; i++) { 1828 methodHandle method(THREAD, methods->at(i)); 1829 if (select_method(method, want_constructor)) { 1830 if (!publicOnly || method->is_public()) { 1831 idnums->push(method->method_idnum()); 1832 ++num_methods; 1833 } 1834 } 1835 } 1836 1837 // Allocate result 1838 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1839 objArrayHandle result (THREAD, r); 1840 1841 // Now just put the methods that we selected above, but go by their idnum 1842 // in case of redefinition. The methods can be redefined at any safepoint, 1843 // so above when allocating the oop array and below when creating reflect 1844 // objects. 1845 for (int i = 0; i < num_methods; i++) { 1846 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1847 if (method.is_null()) { 1848 // Method may have been deleted and seems this API can handle null 1849 // Otherwise should probably put a method that throws NSME 1850 result->obj_at_put(i, NULL); 1851 } else { 1852 oop m; 1853 if (want_constructor) { 1854 m = Reflection::new_constructor(method, CHECK_NULL); 1855 } else { 1856 m = Reflection::new_method(method, false, CHECK_NULL); 1857 } 1858 result->obj_at_put(i, m); 1859 } 1860 } 1861 1862 return (jobjectArray) JNIHandles::make_local(env, result()); 1863 } 1864 1865 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1866 { 1867 JVMWrapper("JVM_GetClassDeclaredMethods"); 1868 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1869 /*want_constructor*/ false, 1870 SystemDictionary::reflect_Method_klass(), THREAD); 1871 } 1872 JVM_END 1873 1874 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1875 { 1876 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1877 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1878 /*want_constructor*/ true, 1879 SystemDictionary::reflect_Constructor_klass(), THREAD); 1880 } 1881 JVM_END 1882 1883 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1884 { 1885 JVMWrapper("JVM_GetClassAccessFlags"); 1886 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1887 // Primitive type 1888 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1889 } 1890 1891 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1892 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1893 } 1894 JVM_END 1895 1896 1897 // Constant pool access ////////////////////////////////////////////////////////// 1898 1899 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1900 { 1901 JVMWrapper("JVM_GetClassConstantPool"); 1902 JvmtiVMObjectAllocEventCollector oam; 1903 1904 // Return null for primitives and arrays 1905 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1906 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1907 if (k->oop_is_instance()) { 1908 instanceKlassHandle k_h(THREAD, k); 1909 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL); 1910 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1911 return JNIHandles::make_local(jcp()); 1912 } 1913 } 1914 return NULL; 1915 } 1916 JVM_END 1917 1918 1919 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1920 { 1921 JVMWrapper("JVM_ConstantPoolGetSize"); 1922 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1923 return cp->length(); 1924 } 1925 JVM_END 1926 1927 1928 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1929 { 1930 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1931 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1932 bounds_check(cp, index, CHECK_NULL); 1933 constantTag tag = cp->tag_at(index); 1934 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1935 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1936 } 1937 Klass* k = cp->klass_at(index, CHECK_NULL); 1938 return (jclass) JNIHandles::make_local(k->java_mirror()); 1939 } 1940 JVM_END 1941 1942 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1943 { 1944 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1945 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1946 bounds_check(cp, index, CHECK_NULL); 1947 constantTag tag = cp->tag_at(index); 1948 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1949 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1950 } 1951 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1952 if (k == NULL) return NULL; 1953 return (jclass) JNIHandles::make_local(k->java_mirror()); 1954 } 1955 JVM_END 1956 1957 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1958 constantTag tag = cp->tag_at(index); 1959 if (!tag.is_method() && !tag.is_interface_method()) { 1960 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1961 } 1962 int klass_ref = cp->uncached_klass_ref_index_at(index); 1963 Klass* k_o; 1964 if (force_resolution) { 1965 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1966 } else { 1967 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1968 if (k_o == NULL) return NULL; 1969 } 1970 instanceKlassHandle k(THREAD, k_o); 1971 Symbol* name = cp->uncached_name_ref_at(index); 1972 Symbol* sig = cp->uncached_signature_ref_at(index); 1973 methodHandle m (THREAD, k->find_method(name, sig)); 1974 if (m.is_null()) { 1975 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1976 } 1977 oop method; 1978 if (!m->is_initializer() || m->is_static()) { 1979 method = Reflection::new_method(m, true, CHECK_NULL); 1980 } else { 1981 method = Reflection::new_constructor(m, CHECK_NULL); 1982 } 1983 return JNIHandles::make_local(method); 1984 } 1985 1986 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1987 { 1988 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1989 JvmtiVMObjectAllocEventCollector oam; 1990 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1991 bounds_check(cp, index, CHECK_NULL); 1992 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1993 return res; 1994 } 1995 JVM_END 1996 1997 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1998 { 1999 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 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_method_at_helper(cp, index, false, CHECK_NULL); 2004 return res; 2005 } 2006 JVM_END 2007 2008 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2009 constantTag tag = cp->tag_at(index); 2010 if (!tag.is_field()) { 2011 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2012 } 2013 int klass_ref = cp->uncached_klass_ref_index_at(index); 2014 Klass* k_o; 2015 if (force_resolution) { 2016 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2017 } else { 2018 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2019 if (k_o == NULL) return NULL; 2020 } 2021 instanceKlassHandle k(THREAD, k_o); 2022 Symbol* name = cp->uncached_name_ref_at(index); 2023 Symbol* sig = cp->uncached_signature_ref_at(index); 2024 fieldDescriptor fd; 2025 Klass* target_klass = k->find_field(name, sig, &fd); 2026 if (target_klass == NULL) { 2027 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2028 } 2029 oop field = Reflection::new_field(&fd, CHECK_NULL); 2030 return JNIHandles::make_local(field); 2031 } 2032 2033 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2034 { 2035 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2036 JvmtiVMObjectAllocEventCollector oam; 2037 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2038 bounds_check(cp, index, CHECK_NULL); 2039 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2040 return res; 2041 } 2042 JVM_END 2043 2044 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2045 { 2046 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2047 JvmtiVMObjectAllocEventCollector oam; 2048 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2049 bounds_check(cp, index, CHECK_NULL); 2050 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2051 return res; 2052 } 2053 JVM_END 2054 2055 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2056 { 2057 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2058 JvmtiVMObjectAllocEventCollector oam; 2059 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2060 bounds_check(cp, index, CHECK_NULL); 2061 constantTag tag = cp->tag_at(index); 2062 if (!tag.is_field_or_method()) { 2063 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2064 } 2065 int klass_ref = cp->uncached_klass_ref_index_at(index); 2066 Symbol* klass_name = cp->klass_name_at(klass_ref); 2067 Symbol* member_name = cp->uncached_name_ref_at(index); 2068 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2069 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2070 objArrayHandle dest(THREAD, dest_o); 2071 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2072 dest->obj_at_put(0, str()); 2073 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2074 dest->obj_at_put(1, str()); 2075 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2076 dest->obj_at_put(2, str()); 2077 return (jobjectArray) JNIHandles::make_local(dest()); 2078 } 2079 JVM_END 2080 2081 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2082 { 2083 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2084 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2085 bounds_check(cp, index, CHECK_0); 2086 constantTag tag = cp->tag_at(index); 2087 if (!tag.is_int()) { 2088 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2089 } 2090 return cp->int_at(index); 2091 } 2092 JVM_END 2093 2094 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2095 { 2096 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2097 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2098 bounds_check(cp, index, CHECK_(0L)); 2099 constantTag tag = cp->tag_at(index); 2100 if (!tag.is_long()) { 2101 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2102 } 2103 return cp->long_at(index); 2104 } 2105 JVM_END 2106 2107 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2108 { 2109 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2110 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2111 bounds_check(cp, index, CHECK_(0.0f)); 2112 constantTag tag = cp->tag_at(index); 2113 if (!tag.is_float()) { 2114 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2115 } 2116 return cp->float_at(index); 2117 } 2118 JVM_END 2119 2120 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2121 { 2122 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2123 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2124 bounds_check(cp, index, CHECK_(0.0)); 2125 constantTag tag = cp->tag_at(index); 2126 if (!tag.is_double()) { 2127 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2128 } 2129 return cp->double_at(index); 2130 } 2131 JVM_END 2132 2133 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2134 { 2135 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2136 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2137 bounds_check(cp, index, CHECK_NULL); 2138 constantTag tag = cp->tag_at(index); 2139 if (!tag.is_string()) { 2140 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2141 } 2142 oop str = cp->string_at(index, CHECK_NULL); 2143 return (jstring) JNIHandles::make_local(str); 2144 } 2145 JVM_END 2146 2147 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2148 { 2149 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2150 JvmtiVMObjectAllocEventCollector oam; 2151 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2152 bounds_check(cp, index, CHECK_NULL); 2153 constantTag tag = cp->tag_at(index); 2154 if (!tag.is_symbol()) { 2155 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2156 } 2157 Symbol* sym = cp->symbol_at(index); 2158 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2159 return (jstring) JNIHandles::make_local(str()); 2160 } 2161 JVM_END 2162 2163 2164 // Assertion support. ////////////////////////////////////////////////////////// 2165 2166 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2167 JVMWrapper("JVM_DesiredAssertionStatus"); 2168 assert(cls != NULL, "bad class"); 2169 2170 oop r = JNIHandles::resolve(cls); 2171 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2172 if (java_lang_Class::is_primitive(r)) return false; 2173 2174 Klass* k = java_lang_Class::as_Klass(r); 2175 assert(k->oop_is_instance(), "must be an instance klass"); 2176 if (! k->oop_is_instance()) return false; 2177 2178 ResourceMark rm(THREAD); 2179 const char* name = k->name()->as_C_string(); 2180 bool system_class = k->class_loader() == NULL; 2181 return JavaAssertions::enabled(name, system_class); 2182 2183 JVM_END 2184 2185 2186 // Return a new AssertionStatusDirectives object with the fields filled in with 2187 // command-line assertion arguments (i.e., -ea, -da). 2188 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2189 JVMWrapper("JVM_AssertionStatusDirectives"); 2190 JvmtiVMObjectAllocEventCollector oam; 2191 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2192 return JNIHandles::make_local(env, asd); 2193 JVM_END 2194 2195 // Verification //////////////////////////////////////////////////////////////////////////////// 2196 2197 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2198 2199 // RedefineClasses support: bug 6214132 caused verification to fail. 2200 // All functions from this section should call the jvmtiThreadSate function: 2201 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2202 // The function returns a Klass* of the _scratch_class if the verifier 2203 // was invoked in the middle of the class redefinition. 2204 // Otherwise it returns its argument value which is the _the_class Klass*. 2205 // Please, refer to the description in the jvmtiThreadSate.hpp. 2206 2207 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2208 JVMWrapper("JVM_GetClassNameUTF"); 2209 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2210 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2211 return k->name()->as_utf8(); 2212 JVM_END 2213 2214 2215 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2216 JVMWrapper("JVM_GetClassCPTypes"); 2217 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2218 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2219 // types will have length zero if this is not an InstanceKlass 2220 // (length is determined by call to JVM_GetClassCPEntriesCount) 2221 if (k->oop_is_instance()) { 2222 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2223 for (int index = cp->length() - 1; index >= 0; index--) { 2224 constantTag tag = cp->tag_at(index); 2225 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2226 } 2227 } 2228 JVM_END 2229 2230 2231 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2232 JVMWrapper("JVM_GetClassCPEntriesCount"); 2233 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2234 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2235 if (!k->oop_is_instance()) 2236 return 0; 2237 return InstanceKlass::cast(k)->constants()->length(); 2238 JVM_END 2239 2240 2241 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2242 JVMWrapper("JVM_GetClassFieldsCount"); 2243 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2244 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2245 if (!k->oop_is_instance()) 2246 return 0; 2247 return InstanceKlass::cast(k)->java_fields_count(); 2248 JVM_END 2249 2250 2251 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2252 JVMWrapper("JVM_GetClassMethodsCount"); 2253 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2254 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2255 if (!k->oop_is_instance()) 2256 return 0; 2257 return InstanceKlass::cast(k)->methods()->length(); 2258 JVM_END 2259 2260 2261 // The following methods, used for the verifier, are never called with 2262 // array klasses, so a direct cast to InstanceKlass is safe. 2263 // Typically, these methods are called in a loop with bounds determined 2264 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2265 // zero for arrays. 2266 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2267 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2268 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2269 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2270 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2271 int length = method->checked_exceptions_length(); 2272 if (length > 0) { 2273 CheckedExceptionElement* table= method->checked_exceptions_start(); 2274 for (int i = 0; i < length; i++) { 2275 exceptions[i] = table[i].class_cp_index; 2276 } 2277 } 2278 JVM_END 2279 2280 2281 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2282 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2283 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2284 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2285 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2286 return method->checked_exceptions_length(); 2287 JVM_END 2288 2289 2290 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2291 JVMWrapper("JVM_GetMethodIxByteCode"); 2292 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2293 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2294 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2295 memcpy(code, method->code_base(), method->code_size()); 2296 JVM_END 2297 2298 2299 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2300 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2301 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2302 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2303 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2304 return method->code_size(); 2305 JVM_END 2306 2307 2308 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2309 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2310 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2311 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2312 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2313 ExceptionTable extable(method); 2314 entry->start_pc = extable.start_pc(entry_index); 2315 entry->end_pc = extable.end_pc(entry_index); 2316 entry->handler_pc = extable.handler_pc(entry_index); 2317 entry->catchType = extable.catch_type_index(entry_index); 2318 JVM_END 2319 2320 2321 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2322 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2323 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2324 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2325 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2326 return method->exception_table_length(); 2327 JVM_END 2328 2329 2330 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2331 JVMWrapper("JVM_GetMethodIxModifiers"); 2332 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2333 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2334 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2335 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2336 JVM_END 2337 2338 2339 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2340 JVMWrapper("JVM_GetFieldIxModifiers"); 2341 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2342 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2343 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2344 JVM_END 2345 2346 2347 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2348 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2349 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2350 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2351 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2352 return method->max_locals(); 2353 JVM_END 2354 2355 2356 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2357 JVMWrapper("JVM_GetMethodIxArgsSize"); 2358 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2359 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2360 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2361 return method->size_of_parameters(); 2362 JVM_END 2363 2364 2365 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2366 JVMWrapper("JVM_GetMethodIxMaxStack"); 2367 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2368 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2369 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2370 return method->verifier_max_stack(); 2371 JVM_END 2372 2373 2374 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2375 JVMWrapper("JVM_IsConstructorIx"); 2376 ResourceMark rm(THREAD); 2377 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2378 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2379 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2380 return method->name() == vmSymbols::object_initializer_name(); 2381 JVM_END 2382 2383 2384 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2385 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2386 ResourceMark rm(THREAD); 2387 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2388 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2389 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2390 return method->is_overpass(); 2391 JVM_END 2392 2393 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2394 JVMWrapper("JVM_GetMethodIxIxUTF"); 2395 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2396 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2397 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2398 return method->name()->as_utf8(); 2399 JVM_END 2400 2401 2402 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2403 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2404 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2405 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2406 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2407 return method->signature()->as_utf8(); 2408 JVM_END 2409 2410 /** 2411 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2412 * read entries in the constant pool. Since the old verifier always 2413 * works on a copy of the code, it will not see any rewriting that 2414 * may possibly occur in the middle of verification. So it is important 2415 * that nothing it calls tries to use the cpCache instead of the raw 2416 * constant pool, so we must use cp->uncached_x methods when appropriate. 2417 */ 2418 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2419 JVMWrapper("JVM_GetCPFieldNameUTF"); 2420 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2421 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2422 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2423 switch (cp->tag_at(cp_index).value()) { 2424 case JVM_CONSTANT_Fieldref: 2425 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2426 default: 2427 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2428 } 2429 ShouldNotReachHere(); 2430 return NULL; 2431 JVM_END 2432 2433 2434 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2435 JVMWrapper("JVM_GetCPMethodNameUTF"); 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_InterfaceMethodref: 2441 case JVM_CONSTANT_Methodref: 2442 case JVM_CONSTANT_NameAndType: // for invokedynamic 2443 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2444 default: 2445 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2446 } 2447 ShouldNotReachHere(); 2448 return NULL; 2449 JVM_END 2450 2451 2452 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2453 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2454 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2455 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2456 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2457 switch (cp->tag_at(cp_index).value()) { 2458 case JVM_CONSTANT_InterfaceMethodref: 2459 case JVM_CONSTANT_Methodref: 2460 case JVM_CONSTANT_NameAndType: // for invokedynamic 2461 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2462 default: 2463 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2464 } 2465 ShouldNotReachHere(); 2466 return NULL; 2467 JVM_END 2468 2469 2470 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2471 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2472 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2473 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2474 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2475 switch (cp->tag_at(cp_index).value()) { 2476 case JVM_CONSTANT_Fieldref: 2477 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2478 default: 2479 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2480 } 2481 ShouldNotReachHere(); 2482 return NULL; 2483 JVM_END 2484 2485 2486 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2487 JVMWrapper("JVM_GetCPClassNameUTF"); 2488 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2489 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2490 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2491 Symbol* classname = cp->klass_name_at(cp_index); 2492 return classname->as_utf8(); 2493 JVM_END 2494 2495 2496 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2497 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2498 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2499 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2500 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2501 switch (cp->tag_at(cp_index).value()) { 2502 case JVM_CONSTANT_Fieldref: { 2503 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2504 Symbol* classname = cp->klass_name_at(class_index); 2505 return classname->as_utf8(); 2506 } 2507 default: 2508 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2509 } 2510 ShouldNotReachHere(); 2511 return NULL; 2512 JVM_END 2513 2514 2515 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2516 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2517 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2518 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2519 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2520 switch (cp->tag_at(cp_index).value()) { 2521 case JVM_CONSTANT_Methodref: 2522 case JVM_CONSTANT_InterfaceMethodref: { 2523 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2524 Symbol* classname = cp->klass_name_at(class_index); 2525 return classname->as_utf8(); 2526 } 2527 default: 2528 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2529 } 2530 ShouldNotReachHere(); 2531 return NULL; 2532 JVM_END 2533 2534 2535 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2536 JVMWrapper("JVM_GetCPFieldModifiers"); 2537 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2538 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2539 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2540 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2541 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2542 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2543 switch (cp->tag_at(cp_index).value()) { 2544 case JVM_CONSTANT_Fieldref: { 2545 Symbol* name = cp->uncached_name_ref_at(cp_index); 2546 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2547 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) { 2548 if (fs.name() == name && fs.signature() == signature) { 2549 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2550 } 2551 } 2552 return -1; 2553 } 2554 default: 2555 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2556 } 2557 ShouldNotReachHere(); 2558 return 0; 2559 JVM_END 2560 2561 2562 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2563 JVMWrapper("JVM_GetCPMethodModifiers"); 2564 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2565 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2566 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2567 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2568 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2569 switch (cp->tag_at(cp_index).value()) { 2570 case JVM_CONSTANT_Methodref: 2571 case JVM_CONSTANT_InterfaceMethodref: { 2572 Symbol* name = cp->uncached_name_ref_at(cp_index); 2573 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2574 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2575 int methods_count = methods->length(); 2576 for (int i = 0; i < methods_count; i++) { 2577 Method* method = methods->at(i); 2578 if (method->name() == name && method->signature() == signature) { 2579 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2580 } 2581 } 2582 return -1; 2583 } 2584 default: 2585 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2586 } 2587 ShouldNotReachHere(); 2588 return 0; 2589 JVM_END 2590 2591 2592 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2593 2594 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2595 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2596 JVM_END 2597 2598 2599 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2600 JVMWrapper("JVM_IsSameClassPackage"); 2601 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2602 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2603 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2604 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2605 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2606 JVM_END 2607 2608 // Printing support ////////////////////////////////////////////////// 2609 extern "C" { 2610 2611 ATTRIBUTE_PRINTF(3, 0) 2612 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2613 // see bug 4399518, 4417214 2614 if ((intptr_t)count <= 0) return -1; 2615 2616 int result = vsnprintf(str, count, fmt, args); 2617 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2618 // characters which would have been written had the buffer been large 2619 // enough; on Windows, it returns -1. We handle both cases here and 2620 // always return -1, and perform null termination. 2621 if ((result > 0 && (size_t)result >= count) || result == -1) { 2622 str[count - 1] = '\0'; 2623 result = -1; 2624 } 2625 2626 return result; 2627 } 2628 2629 ATTRIBUTE_PRINTF(3, 0) 2630 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2631 va_list args; 2632 int len; 2633 va_start(args, fmt); 2634 len = jio_vsnprintf(str, count, fmt, args); 2635 va_end(args); 2636 return len; 2637 } 2638 2639 ATTRIBUTE_PRINTF(2,3) 2640 int jio_fprintf(FILE* f, const char *fmt, ...) { 2641 int len; 2642 va_list args; 2643 va_start(args, fmt); 2644 len = jio_vfprintf(f, fmt, args); 2645 va_end(args); 2646 return len; 2647 } 2648 2649 ATTRIBUTE_PRINTF(2, 0) 2650 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2651 if (Arguments::vfprintf_hook() != NULL) { 2652 return Arguments::vfprintf_hook()(f, fmt, args); 2653 } else { 2654 return vfprintf(f, fmt, args); 2655 } 2656 } 2657 2658 ATTRIBUTE_PRINTF(1, 2) 2659 JNIEXPORT int jio_printf(const char *fmt, ...) { 2660 int len; 2661 va_list args; 2662 va_start(args, fmt); 2663 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2664 va_end(args); 2665 return len; 2666 } 2667 2668 2669 // HotSpot specific jio method 2670 void jio_print(const char* s) { 2671 // Try to make this function as atomic as possible. 2672 if (Arguments::vfprintf_hook() != NULL) { 2673 jio_fprintf(defaultStream::output_stream(), "%s", s); 2674 } else { 2675 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2676 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2677 } 2678 } 2679 2680 } // Extern C 2681 2682 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2683 2684 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 2685 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or 2686 // OSThread objects. The exception to this rule is when the target object is the thread 2687 // doing the operation, in which case we know that the thread won't exit until the 2688 // operation is done (all exits being voluntary). There are a few cases where it is 2689 // rather silly to do operations on yourself, like resuming yourself or asking whether 2690 // you are alive. While these can still happen, they are not subject to deadlocks if 2691 // the lock is held while the operation occurs (this is not the case for suspend, for 2692 // instance), and are very unlikely. Because IsAlive needs to be fast and its 2693 // implementation is local to this file, we always lock Threads_lock for that one. 2694 2695 static void thread_entry(JavaThread* thread, TRAPS) { 2696 HandleMark hm(THREAD); 2697 Handle obj(THREAD, thread->threadObj()); 2698 JavaValue result(T_VOID); 2699 JavaCalls::call_virtual(&result, 2700 obj, 2701 KlassHandle(THREAD, SystemDictionary::Thread_klass()), 2702 vmSymbols::run_method_name(), 2703 vmSymbols::void_method_signature(), 2704 THREAD); 2705 } 2706 2707 2708 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2709 JVMWrapper("JVM_StartThread"); 2710 JavaThread *native_thread = NULL; 2711 2712 // We cannot hold the Threads_lock when we throw an exception, 2713 // due to rank ordering issues. Example: we might need to grab the 2714 // Heap_lock while we construct the exception. 2715 bool throw_illegal_thread_state = false; 2716 2717 // We must release the Threads_lock before we can post a jvmti event 2718 // in Thread::start. 2719 { 2720 // Ensure that the C++ Thread and OSThread structures aren't freed before 2721 // we operate. 2722 MutexLocker mu(Threads_lock); 2723 2724 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2725 // re-starting an already started thread, so we should usually find 2726 // that the JavaThread is null. However for a JNI attached thread 2727 // there is a small window between the Thread object being created 2728 // (with its JavaThread set) and the update to its threadStatus, so we 2729 // have to check for this 2730 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2731 throw_illegal_thread_state = true; 2732 } else { 2733 // We could also check the stillborn flag to see if this thread was already stopped, but 2734 // for historical reasons we let the thread detect that itself when it starts running 2735 2736 jlong size = 2737 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2738 // Allocate the C++ Thread structure and create the native thread. The 2739 // stack size retrieved from java is signed, but the constructor takes 2740 // size_t (an unsigned type), so avoid passing negative values which would 2741 // result in really large stacks. 2742 size_t sz = size > 0 ? (size_t) size : 0; 2743 native_thread = new JavaThread(&thread_entry, sz); 2744 2745 // At this point it may be possible that no osthread was created for the 2746 // JavaThread due to lack of memory. Check for this situation and throw 2747 // an exception if necessary. Eventually we may want to change this so 2748 // that we only grab the lock if the thread was created successfully - 2749 // then we can also do this check and throw the exception in the 2750 // JavaThread constructor. 2751 if (native_thread->osthread() != NULL) { 2752 // Note: the current thread is not being used within "prepare". 2753 native_thread->prepare(jthread); 2754 } 2755 } 2756 } 2757 2758 if (throw_illegal_thread_state) { 2759 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2760 } 2761 2762 assert(native_thread != NULL, "Starting null thread?"); 2763 2764 if (native_thread->osthread() == NULL) { 2765 // No one should hold a reference to the 'native_thread'. 2766 delete native_thread; 2767 if (JvmtiExport::should_post_resource_exhausted()) { 2768 JvmtiExport::post_resource_exhausted( 2769 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2770 os::native_thread_creation_failed_msg()); 2771 } 2772 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2773 os::native_thread_creation_failed_msg()); 2774 } 2775 2776 Thread::start(native_thread); 2777 2778 JVM_END 2779 2780 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2781 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2782 // but is thought to be reliable and simple. In the case, where the receiver is the 2783 // same thread as the sender, no safepoint is needed. 2784 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2785 JVMWrapper("JVM_StopThread"); 2786 2787 oop java_throwable = JNIHandles::resolve(throwable); 2788 if (java_throwable == NULL) { 2789 THROW(vmSymbols::java_lang_NullPointerException()); 2790 } 2791 oop java_thread = JNIHandles::resolve_non_null(jthread); 2792 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2793 Events::log_exception(JavaThread::current(), 2794 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2795 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2796 // First check if thread is alive 2797 if (receiver != NULL) { 2798 // Check if exception is getting thrown at self (use oop equality, since the 2799 // target object might exit) 2800 if (java_thread == thread->threadObj()) { 2801 THROW_OOP(java_throwable); 2802 } else { 2803 // Enques a VM_Operation to stop all threads and then deliver the exception... 2804 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 2805 } 2806 } 2807 else { 2808 // Either: 2809 // - target thread has not been started before being stopped, or 2810 // - target thread already terminated 2811 // We could read the threadStatus to determine which case it is 2812 // but that is overkill as it doesn't matter. We must set the 2813 // stillborn flag for the first case, and if the thread has already 2814 // exited setting this flag has no affect 2815 java_lang_Thread::set_stillborn(java_thread); 2816 } 2817 JVM_END 2818 2819 2820 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2821 JVMWrapper("JVM_IsThreadAlive"); 2822 2823 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2824 return java_lang_Thread::is_alive(thread_oop); 2825 JVM_END 2826 2827 2828 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2829 JVMWrapper("JVM_SuspendThread"); 2830 oop java_thread = JNIHandles::resolve_non_null(jthread); 2831 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2832 2833 if (receiver != NULL) { 2834 // thread has run and has not exited (still on threads list) 2835 2836 { 2837 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2838 if (receiver->is_external_suspend()) { 2839 // Don't allow nested external suspend requests. We can't return 2840 // an error from this interface so just ignore the problem. 2841 return; 2842 } 2843 if (receiver->is_exiting()) { // thread is in the process of exiting 2844 return; 2845 } 2846 receiver->set_external_suspend(); 2847 } 2848 2849 // java_suspend() will catch threads in the process of exiting 2850 // and will ignore them. 2851 receiver->java_suspend(); 2852 2853 // It would be nice to have the following assertion in all the 2854 // time, but it is possible for a racing resume request to have 2855 // resumed this thread right after we suspended it. Temporarily 2856 // enable this assertion if you are chasing a different kind of 2857 // bug. 2858 // 2859 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2860 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2861 } 2862 JVM_END 2863 2864 2865 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2866 JVMWrapper("JVM_ResumeThread"); 2867 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 2868 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2869 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2870 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2871 // looks at it. 2872 MutexLocker ml(Threads_lock); 2873 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2874 if (thr != NULL) { 2875 // the thread has run and is not in the process of exiting 2876 thr->java_resume(); 2877 } 2878 JVM_END 2879 2880 2881 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2882 JVMWrapper("JVM_SetThreadPriority"); 2883 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2884 MutexLocker ml(Threads_lock); 2885 oop java_thread = JNIHandles::resolve_non_null(jthread); 2886 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2887 JavaThread* thr = java_lang_Thread::thread(java_thread); 2888 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 2889 Thread::set_priority(thr, (ThreadPriority)prio); 2890 } 2891 JVM_END 2892 2893 2894 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2895 JVMWrapper("JVM_Yield"); 2896 if (os::dont_yield()) return; 2897 HOTSPOT_THREAD_YIELD(); 2898 2899 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield. 2900 // Critical for similar threading behaviour 2901 if (ConvertYieldToSleep) { 2902 os::sleep(thread, MinSleepInterval, false); 2903 } else { 2904 os::naked_yield(); 2905 } 2906 JVM_END 2907 2908 2909 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2910 JVMWrapper("JVM_Sleep"); 2911 2912 if (millis < 0) { 2913 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2914 } 2915 2916 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2917 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2918 } 2919 2920 // Save current thread state and restore it at the end of this block. 2921 // And set new thread state to SLEEPING. 2922 JavaThreadSleepState jtss(thread); 2923 2924 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 2925 2926 EventThreadSleep event; 2927 2928 if (millis == 0) { 2929 // When ConvertSleepToYield is on, this matches the classic VM implementation of 2930 // JVM_Sleep. Critical for similar threading behaviour (Win32) 2931 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep 2932 // for SOLARIS 2933 if (ConvertSleepToYield) { 2934 os::naked_yield(); 2935 } else { 2936 ThreadState old_state = thread->osthread()->get_state(); 2937 thread->osthread()->set_state(SLEEPING); 2938 os::sleep(thread, MinSleepInterval, false); 2939 thread->osthread()->set_state(old_state); 2940 } 2941 } else { 2942 ThreadState old_state = thread->osthread()->get_state(); 2943 thread->osthread()->set_state(SLEEPING); 2944 if (os::sleep(thread, millis, true) == OS_INTRPT) { 2945 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 2946 // us while we were sleeping. We do not overwrite those. 2947 if (!HAS_PENDING_EXCEPTION) { 2948 if (event.should_commit()) { 2949 event.set_time(millis); 2950 event.commit(); 2951 } 2952 HOTSPOT_THREAD_SLEEP_END(1); 2953 2954 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 2955 // to properly restore the thread state. That's likely wrong. 2956 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2957 } 2958 } 2959 thread->osthread()->set_state(old_state); 2960 } 2961 if (event.should_commit()) { 2962 event.set_time(millis); 2963 event.commit(); 2964 } 2965 HOTSPOT_THREAD_SLEEP_END(0); 2966 JVM_END 2967 2968 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 2969 JVMWrapper("JVM_CurrentThread"); 2970 oop jthread = thread->threadObj(); 2971 assert (thread != NULL, "no current thread!"); 2972 return JNIHandles::make_local(env, jthread); 2973 JVM_END 2974 2975 2976 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 2977 JVMWrapper("JVM_CountStackFrames"); 2978 2979 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2980 oop java_thread = JNIHandles::resolve_non_null(jthread); 2981 bool throw_illegal_thread_state = false; 2982 int count = 0; 2983 2984 { 2985 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 2986 // We need to re-resolve the java_thread, since a GC might have happened during the 2987 // acquire of the lock 2988 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2989 2990 if (thr == NULL) { 2991 // do nothing 2992 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 2993 // Check whether this java thread has been suspended already. If not, throws 2994 // IllegalThreadStateException. We defer to throw that exception until 2995 // Threads_lock is released since loading exception class has to leave VM. 2996 // The correct way to test a thread is actually suspended is 2997 // wait_for_ext_suspend_completion(), but we can't call that while holding 2998 // the Threads_lock. The above tests are sufficient for our purposes 2999 // provided the walkability of the stack is stable - which it isn't 3000 // 100% but close enough for most practical purposes. 3001 throw_illegal_thread_state = true; 3002 } else { 3003 // Count all java activation, i.e., number of vframes 3004 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 3005 // Native frames are not counted 3006 if (!vfst.method()->is_native()) count++; 3007 } 3008 } 3009 } 3010 3011 if (throw_illegal_thread_state) { 3012 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3013 "this thread is not suspended"); 3014 } 3015 return count; 3016 JVM_END 3017 3018 // Consider: A better way to implement JVM_Interrupt() is to acquire 3019 // Threads_lock to resolve the jthread into a Thread pointer, fetch 3020 // Thread->platformevent, Thread->native_thr, Thread->parker, etc., 3021 // drop Threads_lock, and the perform the unpark() and thr_kill() operations 3022 // outside the critical section. Threads_lock is hot so we want to minimize 3023 // the hold-time. A cleaner interface would be to decompose interrupt into 3024 // two steps. The 1st phase, performed under Threads_lock, would return 3025 // a closure that'd be invoked after Threads_lock was dropped. 3026 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 3027 // admit spurious wakeups. 3028 3029 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3030 JVMWrapper("JVM_Interrupt"); 3031 3032 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3033 oop java_thread = JNIHandles::resolve_non_null(jthread); 3034 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3035 // We need to re-resolve the java_thread, since a GC might have happened during the 3036 // acquire of the lock 3037 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3038 if (thr != NULL) { 3039 Thread::interrupt(thr); 3040 } 3041 JVM_END 3042 3043 3044 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3045 JVMWrapper("JVM_IsInterrupted"); 3046 3047 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3048 oop java_thread = JNIHandles::resolve_non_null(jthread); 3049 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3050 // We need to re-resolve the java_thread, since a GC might have happened during the 3051 // acquire of the lock 3052 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3053 if (thr == NULL) { 3054 return JNI_FALSE; 3055 } else { 3056 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3057 } 3058 JVM_END 3059 3060 3061 // Return true iff the current thread has locked the object passed in 3062 3063 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3064 JVMWrapper("JVM_HoldsLock"); 3065 assert(THREAD->is_Java_thread(), "sanity check"); 3066 if (obj == NULL) { 3067 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3068 } 3069 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3070 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3071 JVM_END 3072 3073 3074 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3075 JVMWrapper("JVM_DumpAllStacks"); 3076 VM_PrintThreads op; 3077 VMThread::execute(&op); 3078 if (JvmtiExport::should_post_data_dump()) { 3079 JvmtiExport::post_data_dump(); 3080 } 3081 JVM_END 3082 3083 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3084 JVMWrapper("JVM_SetNativeThreadName"); 3085 ResourceMark rm(THREAD); 3086 oop java_thread = JNIHandles::resolve_non_null(jthread); 3087 JavaThread* thr = java_lang_Thread::thread(java_thread); 3088 // Thread naming only supported for the current thread, doesn't work for 3089 // target threads. 3090 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3091 // we don't set the name of an attached thread to avoid stepping 3092 // on other programs 3093 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3094 os::set_native_thread_name(thread_name); 3095 } 3096 JVM_END 3097 3098 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3099 3100 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3101 assert(jthread->is_Java_thread(), "must be a Java thread"); 3102 if (jthread->privileged_stack_top() == NULL) return false; 3103 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3104 oop loader = jthread->privileged_stack_top()->class_loader(); 3105 if (loader == NULL) return true; 3106 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3107 if (trusted) return true; 3108 } 3109 return false; 3110 } 3111 3112 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3113 JVMWrapper("JVM_CurrentLoadedClass"); 3114 ResourceMark rm(THREAD); 3115 3116 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3117 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3118 bool trusted = is_trusted_frame(thread, &vfst); 3119 if (trusted) return NULL; 3120 3121 Method* m = vfst.method(); 3122 if (!m->is_native()) { 3123 InstanceKlass* holder = m->method_holder(); 3124 oop loader = holder->class_loader(); 3125 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3126 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3127 } 3128 } 3129 } 3130 return NULL; 3131 JVM_END 3132 3133 3134 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3135 JVMWrapper("JVM_CurrentClassLoader"); 3136 ResourceMark rm(THREAD); 3137 3138 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3139 3140 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3141 bool trusted = is_trusted_frame(thread, &vfst); 3142 if (trusted) return NULL; 3143 3144 Method* m = vfst.method(); 3145 if (!m->is_native()) { 3146 InstanceKlass* holder = m->method_holder(); 3147 assert(holder->is_klass(), "just checking"); 3148 oop loader = holder->class_loader(); 3149 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3150 return JNIHandles::make_local(env, loader); 3151 } 3152 } 3153 } 3154 return NULL; 3155 JVM_END 3156 3157 3158 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3159 JVMWrapper("JVM_GetClassContext"); 3160 ResourceMark rm(THREAD); 3161 JvmtiVMObjectAllocEventCollector oam; 3162 vframeStream vfst(thread); 3163 3164 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3165 // This must only be called from SecurityManager.getClassContext 3166 Method* m = vfst.method(); 3167 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3168 m->name() == vmSymbols::getClassContext_name() && 3169 m->signature() == vmSymbols::void_class_array_signature())) { 3170 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3171 } 3172 } 3173 3174 // Collect method holders 3175 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>(); 3176 for (; !vfst.at_end(); vfst.security_next()) { 3177 Method* m = vfst.method(); 3178 // Native frames are not returned 3179 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3180 Klass* holder = m->method_holder(); 3181 assert(holder->is_klass(), "just checking"); 3182 klass_array->append(holder); 3183 } 3184 } 3185 3186 // Create result array of type [Ljava/lang/Class; 3187 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3188 // Fill in mirrors corresponding to method holders 3189 for (int i = 0; i < klass_array->length(); i++) { 3190 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3191 } 3192 3193 return (jobjectArray) JNIHandles::make_local(env, result); 3194 JVM_END 3195 3196 3197 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3198 JVMWrapper("JVM_ClassDepth"); 3199 ResourceMark rm(THREAD); 3200 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3201 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3202 3203 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3204 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3205 if (class_name_sym == NULL) { 3206 return -1; 3207 } 3208 3209 int depth = 0; 3210 3211 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3212 if (!vfst.method()->is_native()) { 3213 InstanceKlass* holder = vfst.method()->method_holder(); 3214 assert(holder->is_klass(), "just checking"); 3215 if (holder->name() == class_name_sym) { 3216 return depth; 3217 } 3218 depth++; 3219 } 3220 } 3221 return -1; 3222 JVM_END 3223 3224 3225 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3226 JVMWrapper("JVM_ClassLoaderDepth"); 3227 ResourceMark rm(THREAD); 3228 int depth = 0; 3229 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3230 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3231 bool trusted = is_trusted_frame(thread, &vfst); 3232 if (trusted) return -1; 3233 3234 Method* m = vfst.method(); 3235 if (!m->is_native()) { 3236 InstanceKlass* holder = m->method_holder(); 3237 assert(holder->is_klass(), "just checking"); 3238 oop loader = holder->class_loader(); 3239 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3240 return depth; 3241 } 3242 depth++; 3243 } 3244 } 3245 return -1; 3246 JVM_END 3247 3248 3249 // java.lang.Package //////////////////////////////////////////////////////////////// 3250 3251 3252 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3253 JVMWrapper("JVM_GetSystemPackage"); 3254 ResourceMark rm(THREAD); 3255 JvmtiVMObjectAllocEventCollector oam; 3256 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3257 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3258 return (jstring) JNIHandles::make_local(result); 3259 JVM_END 3260 3261 3262 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3263 JVMWrapper("JVM_GetSystemPackages"); 3264 JvmtiVMObjectAllocEventCollector oam; 3265 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3266 return (jobjectArray) JNIHandles::make_local(result); 3267 JVM_END 3268 3269 3270 // ObjectInputStream /////////////////////////////////////////////////////////////// 3271 3272 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3273 if (current_class == NULL) { 3274 return true; 3275 } 3276 if ((current_class == field_class) || access.is_public()) { 3277 return true; 3278 } 3279 3280 if (access.is_protected()) { 3281 // See if current_class is a subclass of field_class 3282 if (current_class->is_subclass_of(field_class)) { 3283 return true; 3284 } 3285 } 3286 3287 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3288 } 3289 3290 // Return the first non-null class loader up the execution stack, or null 3291 // if only code from the null class loader is on the stack. 3292 3293 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3294 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3295 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3296 oop loader = vfst.method()->method_holder()->class_loader(); 3297 if (loader != NULL) { 3298 return JNIHandles::make_local(env, loader); 3299 } 3300 } 3301 return NULL; 3302 JVM_END 3303 3304 3305 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3306 3307 3308 // resolve array handle and check arguments 3309 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3310 if (arr == NULL) { 3311 THROW_0(vmSymbols::java_lang_NullPointerException()); 3312 } 3313 oop a = JNIHandles::resolve_non_null(arr); 3314 if (!a->is_array()) { 3315 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3316 } else if (type_array_only && !a->is_typeArray()) { 3317 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3318 } 3319 return arrayOop(a); 3320 } 3321 3322 3323 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3324 JVMWrapper("JVM_GetArrayLength"); 3325 arrayOop a = check_array(env, arr, false, CHECK_0); 3326 return a->length(); 3327 JVM_END 3328 3329 3330 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3331 JVMWrapper("JVM_Array_Get"); 3332 JvmtiVMObjectAllocEventCollector oam; 3333 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3334 jvalue value; 3335 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3336 oop box = Reflection::box(&value, type, CHECK_NULL); 3337 return JNIHandles::make_local(env, box); 3338 JVM_END 3339 3340 3341 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3342 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3343 jvalue value; 3344 value.i = 0; // to initialize value before getting used in CHECK 3345 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3346 assert(a->is_typeArray(), "just checking"); 3347 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3348 BasicType wide_type = (BasicType) wCode; 3349 if (type != wide_type) { 3350 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3351 } 3352 return value; 3353 JVM_END 3354 3355 3356 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3357 JVMWrapper("JVM_SetArrayElement"); 3358 arrayOop a = check_array(env, arr, false, CHECK); 3359 oop box = JNIHandles::resolve(val); 3360 jvalue value; 3361 value.i = 0; // to initialize value before getting used in CHECK 3362 BasicType value_type; 3363 if (a->is_objArray()) { 3364 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3365 value_type = Reflection::unbox_for_regular_object(box, &value); 3366 } else { 3367 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3368 } 3369 Reflection::array_set(&value, a, index, value_type, CHECK); 3370 JVM_END 3371 3372 3373 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3374 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3375 arrayOop a = check_array(env, arr, true, CHECK); 3376 assert(a->is_typeArray(), "just checking"); 3377 BasicType value_type = (BasicType) vCode; 3378 Reflection::array_set(&v, a, index, value_type, CHECK); 3379 JVM_END 3380 3381 3382 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3383 JVMWrapper("JVM_NewArray"); 3384 JvmtiVMObjectAllocEventCollector oam; 3385 oop element_mirror = JNIHandles::resolve(eltClass); 3386 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3387 return JNIHandles::make_local(env, result); 3388 JVM_END 3389 3390 3391 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3392 JVMWrapper("JVM_NewMultiArray"); 3393 JvmtiVMObjectAllocEventCollector oam; 3394 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3395 oop element_mirror = JNIHandles::resolve(eltClass); 3396 assert(dim_array->is_typeArray(), "just checking"); 3397 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3398 return JNIHandles::make_local(env, result); 3399 JVM_END 3400 3401 3402 // Library support /////////////////////////////////////////////////////////////////////////// 3403 3404 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3405 //%note jvm_ct 3406 JVMWrapper2("JVM_LoadLibrary (%s)", name); 3407 char ebuf[1024]; 3408 void *load_result; 3409 { 3410 ThreadToNativeFromVM ttnfvm(thread); 3411 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3412 } 3413 if (load_result == NULL) { 3414 char msg[1024]; 3415 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3416 // Since 'ebuf' may contain a string encoded using 3417 // platform encoding scheme, we need to pass 3418 // Exceptions::unsafe_to_utf8 to the new_exception method 3419 // as the last argument. See bug 6367357. 3420 Handle h_exception = 3421 Exceptions::new_exception(thread, 3422 vmSymbols::java_lang_UnsatisfiedLinkError(), 3423 msg, Exceptions::unsafe_to_utf8); 3424 3425 THROW_HANDLE_0(h_exception); 3426 } 3427 return load_result; 3428 JVM_END 3429 3430 3431 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3432 JVMWrapper("JVM_UnloadLibrary"); 3433 os::dll_unload(handle); 3434 JVM_END 3435 3436 3437 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3438 JVMWrapper2("JVM_FindLibraryEntry (%s)", name); 3439 return os::dll_lookup(handle, name); 3440 JVM_END 3441 3442 3443 // JNI version /////////////////////////////////////////////////////////////////////////////// 3444 3445 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3446 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version); 3447 return Threads::is_supported_jni_version_including_1_1(version); 3448 JVM_END 3449 3450 3451 // String support /////////////////////////////////////////////////////////////////////////// 3452 3453 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3454 JVMWrapper("JVM_InternString"); 3455 JvmtiVMObjectAllocEventCollector oam; 3456 if (str == NULL) return NULL; 3457 oop string = JNIHandles::resolve_non_null(str); 3458 oop result = StringTable::intern(string, CHECK_NULL); 3459 return (jstring) JNIHandles::make_local(env, result); 3460 JVM_END 3461 3462 3463 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3464 3465 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3466 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3467 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3468 // that only works with java threads. 3469 3470 3471 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3472 VM_Exit::block_if_vm_exited(); 3473 JVMWrapper("JVM_RawMonitorCreate"); 3474 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3475 } 3476 3477 3478 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3479 VM_Exit::block_if_vm_exited(); 3480 JVMWrapper("JVM_RawMonitorDestroy"); 3481 delete ((Mutex*) mon); 3482 } 3483 3484 3485 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3486 VM_Exit::block_if_vm_exited(); 3487 JVMWrapper("JVM_RawMonitorEnter"); 3488 ((Mutex*) mon)->jvm_raw_lock(); 3489 return 0; 3490 } 3491 3492 3493 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3494 VM_Exit::block_if_vm_exited(); 3495 JVMWrapper("JVM_RawMonitorExit"); 3496 ((Mutex*) mon)->jvm_raw_unlock(); 3497 } 3498 3499 3500 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3501 3502 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3503 Handle loader, Handle protection_domain, 3504 jboolean throwError, TRAPS) { 3505 // Security Note: 3506 // The Java level wrapper will perform the necessary security check allowing 3507 // us to pass the NULL as the initiating class loader. The VM is responsible for 3508 // the checkPackageAccess relative to the initiating class loader via the 3509 // protection_domain. The protection_domain is passed as NULL by the java code 3510 // if there is no security manager in 3-arg Class.forName(). 3511 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3512 3513 KlassHandle klass_handle(THREAD, klass); 3514 // Check if we should initialize the class 3515 if (init && klass_handle->oop_is_instance()) { 3516 klass_handle->initialize(CHECK_NULL); 3517 } 3518 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror()); 3519 } 3520 3521 3522 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3523 3524 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3525 JVMWrapper("JVM_InvokeMethod"); 3526 Handle method_handle; 3527 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3528 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3529 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3530 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3531 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3532 jobject res = JNIHandles::make_local(env, result); 3533 if (JvmtiExport::should_post_vm_object_alloc()) { 3534 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3535 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3536 if (java_lang_Class::is_primitive(ret_type)) { 3537 // Only for primitive type vm allocates memory for java object. 3538 // See box() method. 3539 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3540 } 3541 } 3542 return res; 3543 } else { 3544 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3545 } 3546 JVM_END 3547 3548 3549 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3550 JVMWrapper("JVM_NewInstanceFromConstructor"); 3551 oop constructor_mirror = JNIHandles::resolve(c); 3552 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3553 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3554 jobject res = JNIHandles::make_local(env, result); 3555 if (JvmtiExport::should_post_vm_object_alloc()) { 3556 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3557 } 3558 return res; 3559 JVM_END 3560 3561 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3562 3563 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3564 JVMWrapper("JVM_SupportsCX8"); 3565 return VM_Version::supports_cx8(); 3566 JVM_END 3567 3568 // DTrace /////////////////////////////////////////////////////////////////// 3569 3570 JVM_ENTRY(jint, JVM_DTraceGetVersion(JNIEnv* env)) 3571 JVMWrapper("JVM_DTraceGetVersion"); 3572 return (jint)JVM_TRACING_DTRACE_VERSION; 3573 JVM_END 3574 3575 JVM_ENTRY(jlong,JVM_DTraceActivate( 3576 JNIEnv* env, jint version, jstring module_name, jint providers_count, 3577 JVM_DTraceProvider* providers)) 3578 JVMWrapper("JVM_DTraceActivate"); 3579 return DTraceJSDT::activate( 3580 version, module_name, providers_count, providers, THREAD); 3581 JVM_END 3582 3583 JVM_ENTRY(jboolean,JVM_DTraceIsProbeEnabled(JNIEnv* env, jmethodID method)) 3584 JVMWrapper("JVM_DTraceIsProbeEnabled"); 3585 return DTraceJSDT::is_probe_enabled(method); 3586 JVM_END 3587 3588 JVM_ENTRY(void,JVM_DTraceDispose(JNIEnv* env, jlong handle)) 3589 JVMWrapper("JVM_DTraceDispose"); 3590 DTraceJSDT::dispose(handle); 3591 JVM_END 3592 3593 JVM_ENTRY(jboolean,JVM_DTraceIsSupported(JNIEnv* env)) 3594 JVMWrapper("JVM_DTraceIsSupported"); 3595 return DTraceJSDT::is_supported(); 3596 JVM_END 3597 3598 // Returns an array of all live Thread objects (VM internal JavaThreads, 3599 // jvmti agent threads, and JNI attaching threads are skipped) 3600 // See CR 6404306 regarding JNI attaching threads 3601 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3602 ResourceMark rm(THREAD); 3603 ThreadsListEnumerator tle(THREAD, false, false); 3604 JvmtiVMObjectAllocEventCollector oam; 3605 3606 int num_threads = tle.num_threads(); 3607 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3608 objArrayHandle threads_ah(THREAD, r); 3609 3610 for (int i = 0; i < num_threads; i++) { 3611 Handle h = tle.get_threadObj(i); 3612 threads_ah->obj_at_put(i, h()); 3613 } 3614 3615 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3616 JVM_END 3617 3618 3619 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3620 // Return StackTraceElement[][], each element is the stack trace of a thread in 3621 // the corresponding entry in the given threads array 3622 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3623 JVMWrapper("JVM_DumpThreads"); 3624 JvmtiVMObjectAllocEventCollector oam; 3625 3626 // Check if threads is null 3627 if (threads == NULL) { 3628 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3629 } 3630 3631 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3632 objArrayHandle ah(THREAD, a); 3633 int num_threads = ah->length(); 3634 // check if threads is non-empty array 3635 if (num_threads == 0) { 3636 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3637 } 3638 3639 // check if threads is not an array of objects of Thread class 3640 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3641 if (k != SystemDictionary::Thread_klass()) { 3642 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3643 } 3644 3645 ResourceMark rm(THREAD); 3646 3647 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3648 for (int i = 0; i < num_threads; i++) { 3649 oop thread_obj = ah->obj_at(i); 3650 instanceHandle h(THREAD, (instanceOop) thread_obj); 3651 thread_handle_array->append(h); 3652 } 3653 3654 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3655 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3656 3657 JVM_END 3658 3659 // JVM monitoring and management support 3660 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3661 return Management::get_jmm_interface(version); 3662 JVM_END 3663 3664 // com.sun.tools.attach.VirtualMachine agent properties support 3665 // 3666 // Initialize the agent properties with the properties maintained in the VM 3667 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3668 JVMWrapper("JVM_InitAgentProperties"); 3669 ResourceMark rm; 3670 3671 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3672 3673 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3674 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3675 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3676 return properties; 3677 JVM_END 3678 3679 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3680 { 3681 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3682 JvmtiVMObjectAllocEventCollector oam; 3683 3684 if (ofClass == NULL) { 3685 return NULL; 3686 } 3687 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3688 // Special handling for primitive objects 3689 if (java_lang_Class::is_primitive(mirror())) { 3690 return NULL; 3691 } 3692 Klass* k = java_lang_Class::as_Klass(mirror()); 3693 if (!k->oop_is_instance()) { 3694 return NULL; 3695 } 3696 instanceKlassHandle ik_h(THREAD, k); 3697 int encl_method_class_idx = ik_h->enclosing_method_class_index(); 3698 if (encl_method_class_idx == 0) { 3699 return NULL; 3700 } 3701 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3702 objArrayHandle dest(THREAD, dest_o); 3703 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3704 dest->obj_at_put(0, enc_k->java_mirror()); 3705 int encl_method_method_idx = ik_h->enclosing_method_method_index(); 3706 if (encl_method_method_idx != 0) { 3707 Symbol* sym = ik_h->constants()->symbol_at( 3708 extract_low_short_from_int( 3709 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3710 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3711 dest->obj_at_put(1, str()); 3712 sym = ik_h->constants()->symbol_at( 3713 extract_high_short_from_int( 3714 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3715 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3716 dest->obj_at_put(2, str()); 3717 } 3718 return (jobjectArray) JNIHandles::make_local(dest()); 3719 } 3720 JVM_END 3721 3722 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3723 { 3724 memset(info, 0, info_size); 3725 3726 info->jvm_version = Abstract_VM_Version::jvm_version(); 3727 info->update_version = 0; /* 0 in HotSpot Express VM */ 3728 info->special_update_version = 0; /* 0 in HotSpot Express VM */ 3729 3730 // when we add a new capability in the jvm_version_info struct, we should also 3731 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3732 // counter defined in runtimeService.cpp. 3733 info->is_attachable = AttachListener::is_attach_supported(); 3734 } 3735 JVM_END