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.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "gc_interface/collectedHeap.inline.hpp" 33 #include "interpreter/bytecode.hpp" 34 #include "memory/oopFactory.hpp" 35 #include "memory/universe.inline.hpp" 36 #include "oops/fieldStreams.hpp" 37 #include "oops/instanceKlass.hpp" 38 #include "oops/objArrayKlass.hpp" 39 #include "oops/method.hpp" 40 #include "prims/jvm.h" 41 #include "prims/jvm_misc.hpp" 42 #include "prims/jvmtiExport.hpp" 43 #include "prims/jvmtiThreadState.hpp" 44 #include "prims/nativeLookup.hpp" 45 #include "prims/privilegedStack.hpp" 46 #include "runtime/arguments.hpp" 47 #include "runtime/atomic.inline.hpp" 48 #include "runtime/dtraceJSDT.hpp" 49 #include "runtime/handles.inline.hpp" 50 #include "runtime/init.hpp" 51 #include "runtime/interfaceSupport.hpp" 52 #include "runtime/java.hpp" 53 #include "runtime/javaCalls.hpp" 54 #include "runtime/jfieldIDWorkaround.hpp" 55 #include "runtime/orderAccess.inline.hpp" 56 #include "runtime/os.inline.hpp" 57 #include "runtime/perfData.hpp" 58 #include "runtime/reflection.hpp" 59 #include "runtime/thread.inline.hpp" 60 #include "runtime/vframe.hpp" 61 #include "runtime/vm_operations.hpp" 62 #include "runtime/vm_version.hpp" 63 #include "services/attachListener.hpp" 64 #include "services/management.hpp" 65 #include "services/threadService.hpp" 66 #include "trace/tracing.hpp" 67 #include "utilities/copy.hpp" 68 #include "utilities/defaultStream.hpp" 69 #include "utilities/dtrace.hpp" 70 #include "utilities/events.hpp" 71 #include "utilities/histogram.hpp" 72 #include "utilities/macros.hpp" 73 #include "utilities/top.hpp" 74 #include "utilities/utf8.hpp" 75 #if INCLUDE_CDS 76 #include "classfile/sharedClassUtil.hpp" 77 #include "classfile/systemDictionaryShared.hpp" 78 #endif 79 #ifdef TARGET_OS_FAMILY_linux 80 # include "jvm_linux.h" 81 #endif 82 #ifdef TARGET_OS_FAMILY_solaris 83 # include "jvm_solaris.h" 84 #endif 85 #ifdef TARGET_OS_FAMILY_windows 86 # include "jvm_windows.h" 87 #endif 88 #ifdef TARGET_OS_FAMILY_aix 89 # include "jvm_aix.h" 90 #endif 91 #ifdef TARGET_OS_FAMILY_bsd 92 # include "jvm_bsd.h" 93 #endif 94 95 #include <errno.h> 96 97 /* 98 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 99 such ctors and calls MUST NOT come between an oop declaration/init and its 100 usage because if objects are move this may cause various memory stomps, bus 101 errors and segfaults. Here is a cookbook for causing so called "naked oop 102 failures": 103 104 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 105 JVMWrapper("JVM_GetClassDeclaredFields"); 106 107 // Object address to be held directly in mirror & not visible to GC 108 oop mirror = JNIHandles::resolve_non_null(ofClass); 109 110 // If this ctor can hit a safepoint, moving objects around, then 111 ComplexConstructor foo; 112 113 // Boom! mirror may point to JUNK instead of the intended object 114 (some dereference of mirror) 115 116 // Here's another call that may block for GC, making mirror stale 117 MutexLocker ml(some_lock); 118 119 // And here's an initializer that can result in a stale oop 120 // all in one step. 121 oop o = call_that_can_throw_exception(TRAPS); 122 123 124 The solution is to keep the oop declaration BELOW the ctor or function 125 call that might cause a GC, do another resolve to reassign the oop, or 126 consider use of a Handle instead of an oop so there is immunity from object 127 motion. But note that the "QUICK" entries below do not have a handlemark 128 and thus can only support use of handles passed in. 129 */ 130 131 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 132 ResourceMark rm; 133 int line_number = -1; 134 const char * source_file = NULL; 135 const char * trace = "explicit"; 136 InstanceKlass* caller = NULL; 137 JavaThread* jthread = JavaThread::current(); 138 if (jthread->has_last_Java_frame()) { 139 vframeStream vfst(jthread); 140 141 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 142 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 143 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 144 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 145 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 146 147 Method* last_caller = NULL; 148 149 while (!vfst.at_end()) { 150 Method* m = vfst.method(); 151 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 152 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 153 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 154 break; 155 } 156 last_caller = m; 157 vfst.next(); 158 } 159 // if this is called from Class.forName0 and that is called from Class.forName, 160 // then print the caller of Class.forName. If this is Class.loadClass, then print 161 // that caller, otherwise keep quiet since this should be picked up elsewhere. 162 bool found_it = false; 163 if (!vfst.at_end() && 164 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 165 vfst.method()->name() == vmSymbols::forName0_name()) { 166 vfst.next(); 167 if (!vfst.at_end() && 168 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 169 vfst.method()->name() == vmSymbols::forName_name()) { 170 vfst.next(); 171 found_it = true; 172 } 173 } else if (last_caller != NULL && 174 last_caller->method_holder()->name() == 175 vmSymbols::java_lang_ClassLoader() && 176 (last_caller->name() == vmSymbols::loadClassInternal_name() || 177 last_caller->name() == vmSymbols::loadClass_name())) { 178 found_it = true; 179 } else if (!vfst.at_end()) { 180 if (vfst.method()->is_native()) { 181 // JNI call 182 found_it = true; 183 } 184 } 185 if (found_it && !vfst.at_end()) { 186 // found the caller 187 caller = vfst.method()->method_holder(); 188 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 189 if (line_number == -1) { 190 // show method name if it's a native method 191 trace = vfst.method()->name_and_sig_as_C_string(); 192 } 193 Symbol* s = caller->source_file_name(); 194 if (s != NULL) { 195 source_file = s->as_C_string(); 196 } 197 } 198 } 199 if (caller != NULL) { 200 if (to_class != caller) { 201 const char * from = caller->external_name(); 202 const char * to = to_class->external_name(); 203 // print in a single call to reduce interleaving between threads 204 if (source_file != NULL) { 205 tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace); 206 } else { 207 tty->print("RESOLVE %s %s (%s)\n", from, to, trace); 208 } 209 } 210 } 211 } 212 213 void trace_class_resolution(Klass* to_class) { 214 EXCEPTION_MARK; 215 trace_class_resolution_impl(to_class, THREAD); 216 if (HAS_PENDING_EXCEPTION) { 217 CLEAR_PENDING_EXCEPTION; 218 } 219 } 220 221 // Wrapper to trace JVM functions 222 223 #ifdef ASSERT 224 class JVMTraceWrapper : public StackObj { 225 public: 226 JVMTraceWrapper(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) { 227 if (TraceJVMCalls) { 228 va_list ap; 229 va_start(ap, format); 230 tty->print("JVM "); 231 tty->vprint_cr(format, ap); 232 va_end(ap); 233 } 234 } 235 }; 236 237 Histogram* JVMHistogram; 238 volatile jint JVMHistogram_lock = 0; 239 240 class JVMHistogramElement : public HistogramElement { 241 public: 242 JVMHistogramElement(const char* name); 243 }; 244 245 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 246 _name = elementName; 247 uintx count = 0; 248 249 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 250 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 251 count +=1; 252 if ( (WarnOnStalledSpinLock > 0) 253 && (count % WarnOnStalledSpinLock == 0)) { 254 warning("JVMHistogram_lock seems to be stalled"); 255 } 256 } 257 } 258 259 if(JVMHistogram == NULL) 260 JVMHistogram = new Histogram("JVM Call Counts",100); 261 262 JVMHistogram->add_element(this); 263 Atomic::dec(&JVMHistogram_lock); 264 } 265 266 #define JVMCountWrapper(arg) \ 267 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 268 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 269 270 #define JVMWrapper(arg1) JVMCountWrapper(arg1); JVMTraceWrapper(arg1) 271 #define JVMWrapper2(arg1, arg2) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2) 272 #define JVMWrapper3(arg1, arg2, arg3) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3) 273 #define JVMWrapper4(arg1, arg2, arg3, arg4) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3, arg4) 274 #else 275 #define JVMWrapper(arg1) 276 #define JVMWrapper2(arg1, arg2) 277 #define JVMWrapper3(arg1, arg2, arg3) 278 #define JVMWrapper4(arg1, arg2, arg3, arg4) 279 #endif 280 281 282 // Interface version ///////////////////////////////////////////////////////////////////// 283 284 285 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 286 return JVM_INTERFACE_VERSION; 287 JVM_END 288 289 290 // java.lang.System ////////////////////////////////////////////////////////////////////// 291 292 293 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 294 JVMWrapper("JVM_CurrentTimeMillis"); 295 return os::javaTimeMillis(); 296 JVM_END 297 298 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 299 JVMWrapper("JVM_NanoTime"); 300 return os::javaTimeNanos(); 301 JVM_END 302 303 // The function below is actually exposed by sun.misc.VM and not 304 // java.lang.System, but we choose to keep it here so that it stays next 305 // to JVM_CurrentTimeMillis and JVM_NanoTime 306 307 const jlong MAX_DIFF_SECS = 0x0100000000; // 2^32 308 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 309 310 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 311 JVMWrapper("JVM_GetNanoTimeAdjustment"); 312 jlong seconds; 313 jlong nanos; 314 315 os::javaTimeSystemUTC(seconds, nanos); 316 317 // We're going to verify that the result can fit in a long. 318 // For that we need the difference in seconds between 'seconds' 319 // and 'offset_secs' to be such that: 320 // |seconds - offset_secs| < (2^63/10^9) 321 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 322 // which makes |seconds - offset_secs| < 2^33 323 // and we will prefer +/- 2^32 as the maximum acceptable diff 324 // as 2^32 has a more natural feel than 2^33... 325 // 326 // So if |seconds - offset_secs| >= 2^32 - we return a special 327 // sentinel value (-1) which the caller should take as an 328 // exception value indicating that the offset given to us is 329 // too far from range of the current time - leading to too big 330 // a nano adjustment. The caller is expected to recover by 331 // computing a more accurate offset and calling this method 332 // again. (For the record 2^32 secs is ~136 years, so that 333 // should rarely happen) 334 // 335 jlong diff = seconds - offset_secs; 336 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 337 return -1; // sentinel value: the offset is too far off the target 338 } 339 340 // return the adjustment. If you compute a time by adding 341 // this number of nanoseconds along with the number of seconds 342 // in the offset you should get the current UTC time. 343 return (diff * (jlong)1000000000) + nanos; 344 JVM_END 345 346 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 347 jobject dst, jint dst_pos, jint length)) 348 JVMWrapper("JVM_ArrayCopy"); 349 // Check if we have null pointers 350 if (src == NULL || dst == NULL) { 351 THROW(vmSymbols::java_lang_NullPointerException()); 352 } 353 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 354 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 355 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop"); 356 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop"); 357 // Do copy 358 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 359 JVM_END 360 361 362 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 363 JavaValue r(T_OBJECT); 364 // public synchronized Object put(Object key, Object value); 365 HandleMark hm(THREAD); 366 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 367 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 368 JavaCalls::call_virtual(&r, 369 props, 370 KlassHandle(THREAD, SystemDictionary::Properties_klass()), 371 vmSymbols::put_name(), 372 vmSymbols::object_object_object_signature(), 373 key_str, 374 value_str, 375 THREAD); 376 } 377 378 379 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 380 381 382 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 383 JVMWrapper("JVM_InitProperties"); 384 ResourceMark rm; 385 386 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 387 388 // System property list includes both user set via -D option and 389 // jvm system specific properties. 390 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 391 PUTPROP(props, p->key(), p->value()); 392 } 393 394 // Convert the -XX:MaxDirectMemorySize= command line flag 395 // to the sun.nio.MaxDirectMemorySize property. 396 // Do this after setting user properties to prevent people 397 // from setting the value with a -D option, as requested. 398 { 399 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 400 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 401 } else { 402 char as_chars[256]; 403 jio_snprintf(as_chars, sizeof(as_chars), UINTX_FORMAT, MaxDirectMemorySize); 404 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 405 } 406 } 407 408 // JVM monitoring and management support 409 // Add the sun.management.compiler property for the compiler's name 410 { 411 #undef CSIZE 412 #if defined(_LP64) || defined(_WIN64) 413 #define CSIZE "64-Bit " 414 #else 415 #define CSIZE 416 #endif // 64bit 417 418 #ifdef TIERED 419 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 420 #else 421 #if defined(COMPILER1) 422 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 423 #elif defined(COMPILER2) 424 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 425 #else 426 const char* compiler_name = ""; 427 #endif // compilers 428 #endif // TIERED 429 430 if (*compiler_name != '\0' && 431 (Arguments::mode() != Arguments::_int)) { 432 PUTPROP(props, "sun.management.compiler", compiler_name); 433 } 434 } 435 436 return properties; 437 JVM_END 438 439 440 /* 441 * Return the temporary directory that the VM uses for the attach 442 * and perf data files. 443 * 444 * It is important that this directory is well-known and the 445 * same for all VM instances. It cannot be affected by configuration 446 * variables such as java.io.tmpdir. 447 */ 448 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 449 JVMWrapper("JVM_GetTemporaryDirectory"); 450 HandleMark hm(THREAD); 451 const char* temp_dir = os::get_temp_directory(); 452 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 453 return (jstring) JNIHandles::make_local(env, h()); 454 JVM_END 455 456 457 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 458 459 extern volatile jint vm_created; 460 461 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 462 before_exit(thread); 463 vm_exit(code); 464 JVM_END 465 466 467 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 468 JVMWrapper("JVM_GC"); 469 if (!DisableExplicitGC) { 470 Universe::heap()->collect(GCCause::_java_lang_system_gc); 471 } 472 JVM_END 473 474 475 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 476 JVMWrapper("JVM_MaxObjectInspectionAge"); 477 return Universe::heap()->millis_since_last_gc(); 478 JVM_END 479 480 481 static inline jlong convert_size_t_to_jlong(size_t val) { 482 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 483 NOT_LP64 (return (jlong)val;) 484 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 485 } 486 487 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 488 JVMWrapper("JVM_TotalMemory"); 489 size_t n = Universe::heap()->capacity(); 490 return convert_size_t_to_jlong(n); 491 JVM_END 492 493 494 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 495 JVMWrapper("JVM_FreeMemory"); 496 CollectedHeap* ch = Universe::heap(); 497 size_t n; 498 { 499 MutexLocker x(Heap_lock); 500 n = ch->capacity() - ch->used(); 501 } 502 return convert_size_t_to_jlong(n); 503 JVM_END 504 505 506 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 507 JVMWrapper("JVM_MaxMemory"); 508 size_t n = Universe::heap()->max_capacity(); 509 return convert_size_t_to_jlong(n); 510 JVM_END 511 512 513 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 514 JVMWrapper("JVM_ActiveProcessorCount"); 515 return os::active_processor_count(); 516 JVM_END 517 518 519 520 // java.lang.Throwable ////////////////////////////////////////////////////// 521 522 523 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 524 JVMWrapper("JVM_FillInStackTrace"); 525 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 526 java_lang_Throwable::fill_in_stack_trace(exception); 527 JVM_END 528 529 530 JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable)) 531 JVMWrapper("JVM_GetStackTraceDepth"); 532 oop exception = JNIHandles::resolve(throwable); 533 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD); 534 JVM_END 535 536 537 JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index)) 538 JVMWrapper("JVM_GetStackTraceElement"); 539 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC 540 oop exception = JNIHandles::resolve(throwable); 541 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL); 542 return JNIHandles::make_local(env, element); 543 JVM_END 544 545 546 // java.lang.Object /////////////////////////////////////////////// 547 548 549 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 550 JVMWrapper("JVM_IHashCode"); 551 // as implemented in the classic virtual machine; return 0 if object is NULL 552 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 553 JVM_END 554 555 556 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 557 JVMWrapper("JVM_MonitorWait"); 558 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 559 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 560 if (JvmtiExport::should_post_monitor_wait()) { 561 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 562 563 // The current thread already owns the monitor and it has not yet 564 // been added to the wait queue so the current thread cannot be 565 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 566 // event handler cannot accidentally consume an unpark() meant for 567 // the ParkEvent associated with this ObjectMonitor. 568 } 569 ObjectSynchronizer::wait(obj, ms, CHECK); 570 JVM_END 571 572 573 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 574 JVMWrapper("JVM_MonitorNotify"); 575 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 576 ObjectSynchronizer::notify(obj, CHECK); 577 JVM_END 578 579 580 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 581 JVMWrapper("JVM_MonitorNotifyAll"); 582 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 583 ObjectSynchronizer::notifyall(obj, CHECK); 584 JVM_END 585 586 587 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 588 JVMWrapper("JVM_Clone"); 589 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 590 const KlassHandle klass (THREAD, obj->klass()); 591 JvmtiVMObjectAllocEventCollector oam; 592 593 #ifdef ASSERT 594 // Just checking that the cloneable flag is set correct 595 if (obj->is_array()) { 596 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 597 } else { 598 guarantee(obj->is_instance(), "should be instanceOop"); 599 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 600 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 601 } 602 #endif 603 604 // Check if class of obj supports the Cloneable interface. 605 // All arrays are considered to be cloneable (See JLS 20.1.5) 606 if (!klass->is_cloneable()) { 607 ResourceMark rm(THREAD); 608 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 609 } 610 611 // Make shallow object copy 612 const int size = obj->size(); 613 oop new_obj_oop = NULL; 614 if (obj->is_array()) { 615 const int length = ((arrayOop)obj())->length(); 616 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 617 } else { 618 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 619 } 620 621 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread 622 // is modifying a reference field in the clonee, a non-oop-atomic copy might 623 // be suspended in the middle of copying the pointer and end up with parts 624 // of two different pointers in the field. Subsequent dereferences will crash. 625 // 4846409: an oop-copy of objects with long or double fields or arrays of same 626 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead 627 // of oops. We know objects are aligned on a minimum of an jlong boundary. 628 // The same is true of StubRoutines::object_copy and the various oop_copy 629 // variants, and of the code generated by the inline_native_clone intrinsic. 630 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); 631 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop, 632 (size_t)align_object_size(size) / HeapWordsPerLong); 633 // Clear the header 634 new_obj_oop->init_mark(); 635 636 // Store check (mark entire object and let gc sort it out) 637 BarrierSet* bs = Universe::heap()->barrier_set(); 638 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); 639 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); 640 641 Handle new_obj(THREAD, new_obj_oop); 642 // Special handling for MemberNames. Since they contain Method* metadata, they 643 // must be registered so that RedefineClasses can fix metadata contained in them. 644 if (java_lang_invoke_MemberName::is_instance(new_obj()) && 645 java_lang_invoke_MemberName::is_method(new_obj())) { 646 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj()); 647 // MemberName may be unresolved, so doesn't need registration until resolved. 648 if (method != NULL) { 649 methodHandle m(THREAD, method); 650 // This can safepoint and redefine method, so need both new_obj and method 651 // in a handle, for two different reasons. new_obj can move, method can be 652 // deleted if nothing is using it on the stack. 653 m->method_holder()->add_member_name(new_obj()); 654 } 655 } 656 657 // Caution: this involves a java upcall, so the clone should be 658 // "gc-robust" by this stage. 659 if (klass->has_finalizer()) { 660 assert(obj->is_instance(), "should be instanceOop"); 661 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 662 new_obj = Handle(THREAD, new_obj_oop); 663 } 664 665 return JNIHandles::make_local(env, new_obj()); 666 JVM_END 667 668 // java.io.File /////////////////////////////////////////////////////////////// 669 670 JVM_LEAF(char*, JVM_NativePath(char* path)) 671 JVMWrapper2("JVM_NativePath (%s)", path); 672 return os::native_path(path); 673 JVM_END 674 675 676 // Misc. class handling /////////////////////////////////////////////////////////// 677 678 679 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 680 JVMWrapper("JVM_GetCallerClass"); 681 682 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 683 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 684 // temporarily for existing code to use until a replacement API is defined. 685 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 686 Klass* k = thread->security_get_caller_class(depth); 687 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 688 } 689 690 // Getting the class of the caller frame. 691 // 692 // The call stack at this point looks something like this: 693 // 694 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 695 // [1] [ @CallerSensitive API.method ] 696 // [.] [ (skipped intermediate frames) ] 697 // [n] [ caller ] 698 vframeStream vfst(thread); 699 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 700 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 701 Method* m = vfst.method(); 702 assert(m != NULL, "sanity"); 703 switch (n) { 704 case 0: 705 // This must only be called from Reflection.getCallerClass 706 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 707 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 708 } 709 // fall-through 710 case 1: 711 // Frame 0 and 1 must be caller sensitive. 712 if (!m->caller_sensitive()) { 713 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 714 } 715 break; 716 default: 717 if (!m->is_ignored_by_security_stack_walk()) { 718 // We have reached the desired frame; return the holder class. 719 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 720 } 721 break; 722 } 723 } 724 return NULL; 725 JVM_END 726 727 728 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 729 JVMWrapper("JVM_FindPrimitiveClass"); 730 oop mirror = NULL; 731 BasicType t = name2type(utf); 732 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 733 mirror = Universe::java_mirror(t); 734 } 735 if (mirror == NULL) { 736 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 737 } else { 738 return (jclass) JNIHandles::make_local(env, mirror); 739 } 740 JVM_END 741 742 743 // Returns a class loaded by the bootstrap class loader; or null 744 // if not found. ClassNotFoundException is not thrown. 745 // FindClassFromBootLoader is exported to the launcher for windows. 746 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 747 const char* name)) 748 JVMWrapper2("JVM_FindClassFromBootLoader %s", name); 749 750 // Java libraries should ensure that name is never null... 751 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 752 // It's impossible to create this class; the name cannot fit 753 // into the constant pool. 754 return NULL; 755 } 756 757 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 758 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 759 if (k == NULL) { 760 return NULL; 761 } 762 763 if (TraceClassResolution) { 764 trace_class_resolution(k); 765 } 766 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 767 JVM_END 768 769 // Find a class with this name in this loader, using the caller's protection domain. 770 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 771 jboolean init, jobject loader, 772 jclass caller)) 773 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name); 774 // Java libraries should ensure that name is never null... 775 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 776 // It's impossible to create this class; the name cannot fit 777 // into the constant pool. 778 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 779 } 780 781 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 782 783 oop loader_oop = JNIHandles::resolve(loader); 784 oop from_class = JNIHandles::resolve(caller); 785 oop protection_domain = NULL; 786 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 787 // NPE. Put it in another way, the bootstrap class loader has all permission and 788 // thus no checkPackageAccess equivalence in the VM class loader. 789 // The caller is also passed as NULL by the java code if there is no security 790 // manager to avoid the performance cost of getting the calling class. 791 if (from_class != NULL && loader_oop != NULL) { 792 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 793 } 794 795 Handle h_loader(THREAD, loader_oop); 796 Handle h_prot(THREAD, protection_domain); 797 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 798 h_prot, false, THREAD); 799 800 if (TraceClassResolution && result != NULL) { 801 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 802 } 803 return result; 804 JVM_END 805 806 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 807 jboolean init, jclass from)) 808 JVMWrapper2("JVM_FindClassFromClass %s", name); 809 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 810 // It's impossible to create this class; the name cannot fit 811 // into the constant pool. 812 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 813 } 814 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 815 oop from_class_oop = JNIHandles::resolve(from); 816 Klass* from_class = (from_class_oop == NULL) 817 ? (Klass*)NULL 818 : java_lang_Class::as_Klass(from_class_oop); 819 oop class_loader = NULL; 820 oop protection_domain = NULL; 821 if (from_class != NULL) { 822 class_loader = from_class->class_loader(); 823 protection_domain = from_class->protection_domain(); 824 } 825 Handle h_loader(THREAD, class_loader); 826 Handle h_prot (THREAD, protection_domain); 827 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 828 h_prot, true, thread); 829 830 if (TraceClassResolution && result != NULL) { 831 // this function is generally only used for class loading during verification. 832 ResourceMark rm; 833 oop from_mirror = JNIHandles::resolve_non_null(from); 834 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 835 const char * from_name = from_class->external_name(); 836 837 oop mirror = JNIHandles::resolve_non_null(result); 838 Klass* to_class = java_lang_Class::as_Klass(mirror); 839 const char * to = to_class->external_name(); 840 tty->print("RESOLVE %s %s (verification)\n", from_name, to); 841 } 842 843 return result; 844 JVM_END 845 846 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 847 if (loader.is_null()) { 848 return; 849 } 850 851 // check whether the current caller thread holds the lock or not. 852 // If not, increment the corresponding counter 853 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 854 ObjectSynchronizer::owner_self) { 855 counter->inc(); 856 } 857 } 858 859 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 860 // and JVM_DefineClassWithSourceCond() 861 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 862 jobject loader, const jbyte *buf, 863 jsize len, jobject pd, const char *source, 864 jboolean verify, TRAPS) { 865 if (source == NULL) source = "__JVM_DefineClass__"; 866 867 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 868 JavaThread* jt = (JavaThread*) THREAD; 869 870 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 871 ClassLoader::perf_define_appclass_selftime(), 872 ClassLoader::perf_define_appclasses(), 873 jt->get_thread_stat()->perf_recursion_counts_addr(), 874 jt->get_thread_stat()->perf_timers_addr(), 875 PerfClassTraceTime::DEFINE_CLASS); 876 877 if (UsePerfData) { 878 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 879 } 880 881 // Since exceptions can be thrown, class initialization can take place 882 // if name is NULL no check for class name in .class stream has to be made. 883 TempNewSymbol class_name = NULL; 884 if (name != NULL) { 885 const int str_len = (int)strlen(name); 886 if (str_len > Symbol::max_length()) { 887 // It's impossible to create this class; the name cannot fit 888 // into the constant pool. 889 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 890 } 891 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 892 } 893 894 ResourceMark rm(THREAD); 895 ClassFileStream st((u1*) buf, len, (char *)source); 896 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 897 if (UsePerfData) { 898 is_lock_held_by_thread(class_loader, 899 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 900 THREAD); 901 } 902 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 903 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader, 904 protection_domain, &st, 905 verify != 0, 906 CHECK_NULL); 907 908 if (TraceClassResolution && k != NULL) { 909 trace_class_resolution(k); 910 } 911 912 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 913 } 914 915 916 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 917 JVMWrapper2("JVM_DefineClass %s", name); 918 919 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD); 920 JVM_END 921 922 923 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 924 JVMWrapper2("JVM_DefineClassWithSource %s", name); 925 926 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD); 927 JVM_END 928 929 JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name, 930 jobject loader, const jbyte *buf, 931 jsize len, jobject pd, 932 const char *source, jboolean verify)) 933 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name); 934 935 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD); 936 JVM_END 937 938 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 939 JVMWrapper("JVM_FindLoadedClass"); 940 ResourceMark rm(THREAD); 941 942 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 943 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 944 945 const char* str = java_lang_String::as_utf8_string(string()); 946 // Sanity check, don't expect null 947 if (str == NULL) return NULL; 948 949 const int str_len = (int)strlen(str); 950 if (str_len > Symbol::max_length()) { 951 // It's impossible to create this class; the name cannot fit 952 // into the constant pool. 953 return NULL; 954 } 955 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 956 957 // Security Note: 958 // The Java level wrapper will perform the necessary security check allowing 959 // us to pass the NULL as the initiating class loader. 960 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 961 if (UsePerfData) { 962 is_lock_held_by_thread(h_loader, 963 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 964 THREAD); 965 } 966 967 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 968 h_loader, 969 Handle(), 970 CHECK_NULL); 971 #if INCLUDE_CDS 972 if (k == NULL) { 973 // If the class is not already loaded, try to see if it's in the shared 974 // archive for the current classloader (h_loader). 975 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class( 976 klass_name, h_loader, CHECK_NULL); 977 k = ik(); 978 } 979 #endif 980 return (k == NULL) ? NULL : 981 (jclass) JNIHandles::make_local(env, k->java_mirror()); 982 JVM_END 983 984 985 // Reflection support ////////////////////////////////////////////////////////////////////////////// 986 987 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 988 assert (cls != NULL, "illegal class"); 989 JVMWrapper("JVM_GetClassName"); 990 JvmtiVMObjectAllocEventCollector oam; 991 ResourceMark rm(THREAD); 992 const char* name; 993 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 994 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 995 } else { 996 // Consider caching interned string in Klass 997 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 998 assert(k->is_klass(), "just checking"); 999 name = k->external_name(); 1000 } 1001 oop result = StringTable::intern((char*) name, CHECK_NULL); 1002 return (jstring) JNIHandles::make_local(env, result); 1003 JVM_END 1004 1005 1006 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1007 JVMWrapper("JVM_GetClassInterfaces"); 1008 JvmtiVMObjectAllocEventCollector oam; 1009 oop mirror = JNIHandles::resolve_non_null(cls); 1010 1011 // Special handling for primitive objects 1012 if (java_lang_Class::is_primitive(mirror)) { 1013 // Primitive objects does not have any interfaces 1014 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1015 return (jobjectArray) JNIHandles::make_local(env, r); 1016 } 1017 1018 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror)); 1019 // Figure size of result array 1020 int size; 1021 if (klass->oop_is_instance()) { 1022 size = InstanceKlass::cast(klass())->local_interfaces()->length(); 1023 } else { 1024 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass"); 1025 size = 2; 1026 } 1027 1028 // Allocate result array 1029 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1030 objArrayHandle result (THREAD, r); 1031 // Fill in result 1032 if (klass->oop_is_instance()) { 1033 // Regular instance klass, fill in all local interfaces 1034 for (int index = 0; index < size; index++) { 1035 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index); 1036 result->obj_at_put(index, k->java_mirror()); 1037 } 1038 } else { 1039 // All arrays implement java.lang.Cloneable and java.io.Serializable 1040 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1041 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1042 } 1043 return (jobjectArray) JNIHandles::make_local(env, result()); 1044 JVM_END 1045 1046 1047 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1048 JVMWrapper("JVM_IsInterface"); 1049 oop mirror = JNIHandles::resolve_non_null(cls); 1050 if (java_lang_Class::is_primitive(mirror)) { 1051 return JNI_FALSE; 1052 } 1053 Klass* k = java_lang_Class::as_Klass(mirror); 1054 jboolean result = k->is_interface(); 1055 assert(!result || k->oop_is_instance(), 1056 "all interfaces are instance types"); 1057 // The compiler intrinsic for isInterface tests the 1058 // Klass::_access_flags bits in the same way. 1059 return result; 1060 JVM_END 1061 1062 1063 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1064 JVMWrapper("JVM_GetClassSigners"); 1065 JvmtiVMObjectAllocEventCollector oam; 1066 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1067 // There are no signers for primitive types 1068 return NULL; 1069 } 1070 1071 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1072 1073 // If there are no signers set in the class, or if the class 1074 // is an array, return NULL. 1075 if (signers == NULL) return NULL; 1076 1077 // copy of the signers array 1078 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1079 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1080 for (int index = 0; index < signers->length(); index++) { 1081 signers_copy->obj_at_put(index, signers->obj_at(index)); 1082 } 1083 1084 // return the copy 1085 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1086 JVM_END 1087 1088 1089 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1090 JVMWrapper("JVM_SetClassSigners"); 1091 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1092 // This call is ignored for primitive types and arrays. 1093 // Signers are only set once, ClassLoader.java, and thus shouldn't 1094 // be called with an array. Only the bootstrap loader creates arrays. 1095 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1096 if (k->oop_is_instance()) { 1097 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1098 } 1099 } 1100 JVM_END 1101 1102 1103 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1104 JVMWrapper("JVM_GetProtectionDomain"); 1105 if (JNIHandles::resolve(cls) == NULL) { 1106 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1107 } 1108 1109 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1110 // Primitive types does not have a protection domain. 1111 return NULL; 1112 } 1113 1114 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1115 return (jobject) JNIHandles::make_local(env, pd); 1116 JVM_END 1117 1118 1119 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) { 1120 // If there is a security manager and protection domain, check the access 1121 // in the protection domain, otherwise it is authorized. 1122 if (java_lang_System::has_security_manager()) { 1123 1124 // For bootstrapping, if pd implies method isn't in the JDK, allow 1125 // this context to revert to older behavior. 1126 // In this case the isAuthorized field in AccessControlContext is also not 1127 // present. 1128 if (Universe::protection_domain_implies_method() == NULL) { 1129 return true; 1130 } 1131 1132 // Whitelist certain access control contexts 1133 if (java_security_AccessControlContext::is_authorized(context)) { 1134 return true; 1135 } 1136 1137 oop prot = klass->protection_domain(); 1138 if (prot != NULL) { 1139 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1140 // in the new wrapper. 1141 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1142 Handle h_prot(THREAD, prot); 1143 JavaValue result(T_BOOLEAN); 1144 JavaCallArguments args(h_prot); 1145 JavaCalls::call(&result, m, &args, CHECK_false); 1146 return (result.get_jboolean() != 0); 1147 } 1148 } 1149 return true; 1150 } 1151 1152 // Create an AccessControlContext with a protection domain with null codesource 1153 // and null permissions - which gives no permissions. 1154 oop create_dummy_access_control_context(TRAPS) { 1155 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass()); 1156 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1157 // Call constructor ProtectionDomain(null, null); 1158 JavaValue result(T_VOID); 1159 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass), 1160 vmSymbols::object_initializer_name(), 1161 vmSymbols::codesource_permissioncollection_signature(), 1162 Handle(), Handle(), CHECK_NULL); 1163 1164 // new ProtectionDomain[] {pd}; 1165 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1166 context->obj_at_put(0, obj()); 1167 1168 // new AccessControlContext(new ProtectionDomain[] {pd}) 1169 objArrayHandle h_context(THREAD, context); 1170 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1171 return acc; 1172 } 1173 1174 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1175 JVMWrapper("JVM_DoPrivileged"); 1176 1177 if (action == NULL) { 1178 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1179 } 1180 1181 // Compute the frame initiating the do privileged operation and setup the privileged stack 1182 vframeStream vfst(thread); 1183 vfst.security_get_caller_frame(1); 1184 1185 if (vfst.at_end()) { 1186 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1187 } 1188 1189 Method* method = vfst.method(); 1190 instanceKlassHandle klass (THREAD, method->method_holder()); 1191 1192 // Check that action object understands "Object run()" 1193 Handle h_context; 1194 if (context != NULL) { 1195 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1196 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1197 if (!authorized) { 1198 // Create an unprivileged access control object and call it's run function 1199 // instead. 1200 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1201 h_context = Handle(THREAD, noprivs); 1202 } 1203 } 1204 1205 // Check that action object understands "Object run()" 1206 Handle object (THREAD, JNIHandles::resolve(action)); 1207 1208 // get run() method 1209 Method* m_oop = object->klass()->uncached_lookup_method( 1210 vmSymbols::run_method_name(), 1211 vmSymbols::void_object_signature(), 1212 Klass::normal); 1213 methodHandle m (THREAD, m_oop); 1214 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { 1215 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1216 } 1217 1218 // Stack allocated list of privileged stack elements 1219 PrivilegedElement pi; 1220 if (!vfst.at_end()) { 1221 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1222 thread->set_privileged_stack_top(&pi); 1223 } 1224 1225 1226 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1227 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1228 Handle pending_exception; 1229 JavaValue result(T_OBJECT); 1230 JavaCallArguments args(object); 1231 JavaCalls::call(&result, m, &args, THREAD); 1232 1233 // done with action, remove ourselves from the list 1234 if (!vfst.at_end()) { 1235 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1236 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1237 } 1238 1239 if (HAS_PENDING_EXCEPTION) { 1240 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1241 CLEAR_PENDING_EXCEPTION; 1242 // JVMTI has already reported the pending exception 1243 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1244 if (THREAD->is_Java_thread()) { 1245 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1246 } 1247 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1248 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1249 // Throw a java.security.PrivilegedActionException(Exception e) exception 1250 JavaCallArguments args(pending_exception); 1251 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1252 vmSymbols::exception_void_signature(), 1253 &args); 1254 } 1255 } 1256 1257 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1258 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1259 JVM_END 1260 1261 1262 // Returns the inherited_access_control_context field of the running thread. 1263 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1264 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1265 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1266 return JNIHandles::make_local(env, result); 1267 JVM_END 1268 1269 class RegisterArrayForGC { 1270 private: 1271 JavaThread *_thread; 1272 public: 1273 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1274 _thread = thread; 1275 _thread->register_array_for_gc(array); 1276 } 1277 1278 ~RegisterArrayForGC() { 1279 _thread->register_array_for_gc(NULL); 1280 } 1281 }; 1282 1283 1284 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1285 JVMWrapper("JVM_GetStackAccessControlContext"); 1286 if (!UsePrivilegedStack) return NULL; 1287 1288 ResourceMark rm(THREAD); 1289 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1290 JvmtiVMObjectAllocEventCollector oam; 1291 1292 // count the protection domains on the execution stack. We collapse 1293 // duplicate consecutive protection domains into a single one, as 1294 // well as stopping when we hit a privileged frame. 1295 1296 // Use vframeStream to iterate through Java frames 1297 vframeStream vfst(thread); 1298 1299 oop previous_protection_domain = NULL; 1300 Handle privileged_context(thread, NULL); 1301 bool is_privileged = false; 1302 oop protection_domain = NULL; 1303 1304 for(; !vfst.at_end(); vfst.next()) { 1305 // get method of frame 1306 Method* method = vfst.method(); 1307 intptr_t* frame_id = vfst.frame_id(); 1308 1309 // check the privileged frames to see if we have a match 1310 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1311 // this frame is privileged 1312 is_privileged = true; 1313 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1314 protection_domain = thread->privileged_stack_top()->protection_domain(); 1315 } else { 1316 protection_domain = method->method_holder()->protection_domain(); 1317 } 1318 1319 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1320 local_array->push(protection_domain); 1321 previous_protection_domain = protection_domain; 1322 } 1323 1324 if (is_privileged) break; 1325 } 1326 1327 1328 // either all the domains on the stack were system domains, or 1329 // we had a privileged system domain 1330 if (local_array->is_empty()) { 1331 if (is_privileged && privileged_context.is_null()) return NULL; 1332 1333 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1334 return JNIHandles::make_local(env, result); 1335 } 1336 1337 // the resource area must be registered in case of a gc 1338 RegisterArrayForGC ragc(thread, local_array); 1339 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1340 local_array->length(), CHECK_NULL); 1341 objArrayHandle h_context(thread, context); 1342 for (int index = 0; index < local_array->length(); index++) { 1343 h_context->obj_at_put(index, local_array->at(index)); 1344 } 1345 1346 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1347 1348 return JNIHandles::make_local(env, result); 1349 JVM_END 1350 1351 1352 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1353 JVMWrapper("JVM_IsArrayClass"); 1354 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1355 return (k != NULL) && k->oop_is_array() ? true : false; 1356 JVM_END 1357 1358 1359 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1360 JVMWrapper("JVM_IsPrimitiveClass"); 1361 oop mirror = JNIHandles::resolve_non_null(cls); 1362 return (jboolean) java_lang_Class::is_primitive(mirror); 1363 JVM_END 1364 1365 1366 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1367 JVMWrapper("JVM_GetClassModifiers"); 1368 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1369 // Primitive type 1370 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1371 } 1372 1373 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1374 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1375 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1376 return k->modifier_flags(); 1377 JVM_END 1378 1379 1380 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1381 1382 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1383 JvmtiVMObjectAllocEventCollector oam; 1384 // ofClass is a reference to a java_lang_Class object. The mirror object 1385 // of an InstanceKlass 1386 1387 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1388 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1389 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1390 return (jobjectArray)JNIHandles::make_local(env, result); 1391 } 1392 1393 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1394 InnerClassesIterator iter(k); 1395 1396 if (iter.length() == 0) { 1397 // Neither an inner nor outer class 1398 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1399 return (jobjectArray)JNIHandles::make_local(env, result); 1400 } 1401 1402 // find inner class info 1403 constantPoolHandle cp(thread, k->constants()); 1404 int length = iter.length(); 1405 1406 // Allocate temp. result array 1407 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1408 objArrayHandle result (THREAD, r); 1409 int members = 0; 1410 1411 for (; !iter.done(); iter.next()) { 1412 int ioff = iter.inner_class_info_index(); 1413 int ooff = iter.outer_class_info_index(); 1414 1415 if (ioff != 0 && ooff != 0) { 1416 // Check to see if the name matches the class we're looking for 1417 // before attempting to find the class. 1418 if (cp->klass_name_at_matches(k, ooff)) { 1419 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1420 if (outer_klass == k()) { 1421 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1422 instanceKlassHandle inner_klass (THREAD, ik); 1423 1424 // Throws an exception if outer klass has not declared k as 1425 // an inner klass 1426 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1427 1428 result->obj_at_put(members, inner_klass->java_mirror()); 1429 members++; 1430 } 1431 } 1432 } 1433 } 1434 1435 if (members != length) { 1436 // Return array of right length 1437 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1438 for(int i = 0; i < members; i++) { 1439 res->obj_at_put(i, result->obj_at(i)); 1440 } 1441 return (jobjectArray)JNIHandles::make_local(env, res); 1442 } 1443 1444 return (jobjectArray)JNIHandles::make_local(env, result()); 1445 JVM_END 1446 1447 1448 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1449 { 1450 // ofClass is a reference to a java_lang_Class object. 1451 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1452 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1453 return NULL; 1454 } 1455 1456 bool inner_is_member = false; 1457 Klass* outer_klass 1458 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1459 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1460 if (outer_klass == NULL) return NULL; // already a top-level class 1461 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1462 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1463 } 1464 JVM_END 1465 1466 // should be in InstanceKlass.cpp, but is here for historical reasons 1467 Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle k, 1468 bool* inner_is_member, 1469 TRAPS) { 1470 Thread* thread = THREAD; 1471 InnerClassesIterator iter(k); 1472 if (iter.length() == 0) { 1473 // No inner class info => no declaring class 1474 return NULL; 1475 } 1476 1477 constantPoolHandle i_cp(thread, k->constants()); 1478 1479 bool found = false; 1480 Klass* ok; 1481 instanceKlassHandle outer_klass; 1482 *inner_is_member = false; 1483 1484 // Find inner_klass attribute 1485 for (; !iter.done() && !found; iter.next()) { 1486 int ioff = iter.inner_class_info_index(); 1487 int ooff = iter.outer_class_info_index(); 1488 int noff = iter.inner_name_index(); 1489 if (ioff != 0) { 1490 // Check to see if the name matches the class we're looking for 1491 // before attempting to find the class. 1492 if (i_cp->klass_name_at_matches(k, ioff)) { 1493 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_NULL); 1494 found = (k() == inner_klass); 1495 if (found && ooff != 0) { 1496 ok = i_cp->klass_at(ooff, CHECK_NULL); 1497 outer_klass = instanceKlassHandle(thread, ok); 1498 *inner_is_member = true; 1499 } 1500 } 1501 } 1502 } 1503 1504 if (found && outer_klass.is_null()) { 1505 // It may be anonymous; try for that. 1506 int encl_method_class_idx = k->enclosing_method_class_index(); 1507 if (encl_method_class_idx != 0) { 1508 ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL); 1509 outer_klass = instanceKlassHandle(thread, ok); 1510 *inner_is_member = false; 1511 } 1512 } 1513 1514 // If no inner class attribute found for this class. 1515 if (outer_klass.is_null()) return NULL; 1516 1517 // Throws an exception if outer klass has not declared k as an inner klass 1518 // We need evidence that each klass knows about the other, or else 1519 // the system could allow a spoof of an inner class to gain access rights. 1520 Reflection::check_for_inner_class(outer_klass, k, *inner_is_member, CHECK_NULL); 1521 return outer_klass(); 1522 } 1523 1524 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1525 assert (cls != NULL, "illegal class"); 1526 JVMWrapper("JVM_GetClassSignature"); 1527 JvmtiVMObjectAllocEventCollector oam; 1528 ResourceMark rm(THREAD); 1529 // Return null for arrays and primatives 1530 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1531 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1532 if (k->oop_is_instance()) { 1533 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1534 if (sym == NULL) return NULL; 1535 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1536 return (jstring) JNIHandles::make_local(env, str()); 1537 } 1538 } 1539 return NULL; 1540 JVM_END 1541 1542 1543 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1544 assert (cls != NULL, "illegal class"); 1545 JVMWrapper("JVM_GetClassAnnotations"); 1546 1547 // Return null for arrays and primitives 1548 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1549 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1550 if (k->oop_is_instance()) { 1551 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1552 return (jbyteArray) JNIHandles::make_local(env, a); 1553 } 1554 } 1555 return NULL; 1556 JVM_END 1557 1558 1559 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1560 // some of this code was adapted from from jni_FromReflectedField 1561 1562 oop reflected = JNIHandles::resolve_non_null(field); 1563 oop mirror = java_lang_reflect_Field::clazz(reflected); 1564 Klass* k = java_lang_Class::as_Klass(mirror); 1565 int slot = java_lang_reflect_Field::slot(reflected); 1566 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1567 1568 KlassHandle kh(THREAD, k); 1569 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot); 1570 1571 if (modifiers & JVM_ACC_STATIC) { 1572 // for static fields we only look in the current class 1573 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) { 1574 assert(false, "cannot find static field"); 1575 return false; 1576 } 1577 } else { 1578 // for instance fields we start with the current class and work 1579 // our way up through the superclass chain 1580 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) { 1581 assert(false, "cannot find instance field"); 1582 return false; 1583 } 1584 } 1585 return true; 1586 } 1587 1588 static Method* jvm_get_method_common(jobject method) { 1589 // some of this code was adapted from from jni_FromReflectedMethod 1590 1591 oop reflected = JNIHandles::resolve_non_null(method); 1592 oop mirror = NULL; 1593 int slot = 0; 1594 1595 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1596 mirror = java_lang_reflect_Constructor::clazz(reflected); 1597 slot = java_lang_reflect_Constructor::slot(reflected); 1598 } else { 1599 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1600 "wrong type"); 1601 mirror = java_lang_reflect_Method::clazz(reflected); 1602 slot = java_lang_reflect_Method::slot(reflected); 1603 } 1604 Klass* k = java_lang_Class::as_Klass(mirror); 1605 1606 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1607 assert(m != NULL, "cannot find method"); 1608 return m; // caller has to deal with NULL in product mode 1609 } 1610 1611 /* Type use annotations support (JDK 1.8) */ 1612 1613 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1614 assert (cls != NULL, "illegal class"); 1615 JVMWrapper("JVM_GetClassTypeAnnotations"); 1616 ResourceMark rm(THREAD); 1617 // Return null for arrays and primitives 1618 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1619 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1620 if (k->oop_is_instance()) { 1621 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1622 if (type_annotations != NULL) { 1623 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1624 return (jbyteArray) JNIHandles::make_local(env, a); 1625 } 1626 } 1627 } 1628 return NULL; 1629 JVM_END 1630 1631 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1632 assert (method != NULL, "illegal method"); 1633 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1634 1635 // method is a handle to a java.lang.reflect.Method object 1636 Method* m = jvm_get_method_common(method); 1637 if (m == NULL) { 1638 return NULL; 1639 } 1640 1641 AnnotationArray* type_annotations = m->type_annotations(); 1642 if (type_annotations != NULL) { 1643 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1644 return (jbyteArray) JNIHandles::make_local(env, a); 1645 } 1646 1647 return NULL; 1648 JVM_END 1649 1650 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1651 assert (field != NULL, "illegal field"); 1652 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1653 1654 fieldDescriptor fd; 1655 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1656 if (!gotFd) { 1657 return NULL; 1658 } 1659 1660 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1661 JVM_END 1662 1663 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { 1664 if (!cp->is_within_bounds(index)) { 1665 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1666 } 1667 } 1668 1669 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1670 { 1671 JVMWrapper("JVM_GetMethodParameters"); 1672 // method is a handle to a java.lang.reflect.Method object 1673 Method* method_ptr = jvm_get_method_common(method); 1674 methodHandle mh (THREAD, method_ptr); 1675 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1676 const int num_params = mh->method_parameters_length(); 1677 1678 if (num_params < 0) { 1679 // A -1 return value from method_parameters_length means there is no 1680 // parameter data. Return null to indicate this to the reflection 1681 // API. 1682 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1683 return (jobjectArray)NULL; 1684 } else { 1685 // Otherwise, we return something up to reflection, even if it is 1686 // a zero-length array. Why? Because in some cases this can 1687 // trigger a MalformedParametersException. 1688 1689 // make sure all the symbols are properly formatted 1690 for (int i = 0; i < num_params; i++) { 1691 MethodParametersElement* params = mh->method_parameters_start(); 1692 int index = params[i].name_cp_index; 1693 bounds_check(mh->constants(), index, CHECK_NULL); 1694 1695 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1696 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1697 "Wrong type at constant pool index"); 1698 } 1699 1700 } 1701 1702 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1703 objArrayHandle result (THREAD, result_oop); 1704 1705 for (int i = 0; i < num_params; i++) { 1706 MethodParametersElement* params = mh->method_parameters_start(); 1707 // For a 0 index, give a NULL symbol 1708 Symbol* sym = 0 != params[i].name_cp_index ? 1709 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1710 int flags = params[i].flags; 1711 oop param = Reflection::new_parameter(reflected_method, i, sym, 1712 flags, CHECK_NULL); 1713 result->obj_at_put(i, param); 1714 } 1715 return (jobjectArray)JNIHandles::make_local(env, result()); 1716 } 1717 } 1718 JVM_END 1719 1720 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1721 1722 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1723 { 1724 JVMWrapper("JVM_GetClassDeclaredFields"); 1725 JvmtiVMObjectAllocEventCollector oam; 1726 1727 // Exclude primitive types and array types 1728 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1729 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 1730 // Return empty array 1731 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1732 return (jobjectArray) JNIHandles::make_local(env, res); 1733 } 1734 1735 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1736 constantPoolHandle cp(THREAD, k->constants()); 1737 1738 // Ensure class is linked 1739 k->link_class(CHECK_NULL); 1740 1741 // 4496456 We need to filter out java.lang.Throwable.backtrace 1742 bool skip_backtrace = false; 1743 1744 // Allocate result 1745 int num_fields; 1746 1747 if (publicOnly) { 1748 num_fields = 0; 1749 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) { 1750 if (fs.access_flags().is_public()) ++num_fields; 1751 } 1752 } else { 1753 num_fields = k->java_fields_count(); 1754 1755 if (k() == SystemDictionary::Throwable_klass()) { 1756 num_fields--; 1757 skip_backtrace = true; 1758 } 1759 } 1760 1761 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1762 objArrayHandle result (THREAD, r); 1763 1764 int out_idx = 0; 1765 fieldDescriptor fd; 1766 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1767 if (skip_backtrace) { 1768 // 4496456 skip java.lang.Throwable.backtrace 1769 int offset = fs.offset(); 1770 if (offset == java_lang_Throwable::get_backtrace_offset()) continue; 1771 } 1772 1773 if (!publicOnly || fs.access_flags().is_public()) { 1774 fd.reinitialize(k(), fs.index()); 1775 oop field = Reflection::new_field(&fd, CHECK_NULL); 1776 result->obj_at_put(out_idx, field); 1777 ++out_idx; 1778 } 1779 } 1780 assert(out_idx == num_fields, "just checking"); 1781 return (jobjectArray) JNIHandles::make_local(env, result()); 1782 } 1783 JVM_END 1784 1785 static bool select_method(methodHandle method, bool want_constructor) { 1786 if (want_constructor) { 1787 return (method->is_initializer() && !method->is_static()); 1788 } else { 1789 return (!method->is_initializer() && !method->is_overpass()); 1790 } 1791 } 1792 1793 static jobjectArray get_class_declared_methods_helper( 1794 JNIEnv *env, 1795 jclass ofClass, jboolean publicOnly, 1796 bool want_constructor, 1797 Klass* klass, TRAPS) { 1798 1799 JvmtiVMObjectAllocEventCollector oam; 1800 1801 // Exclude primitive types and array types 1802 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1803 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 1804 // Return empty array 1805 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1806 return (jobjectArray) JNIHandles::make_local(env, res); 1807 } 1808 1809 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1810 1811 // Ensure class is linked 1812 k->link_class(CHECK_NULL); 1813 1814 Array<Method*>* methods = k->methods(); 1815 int methods_length = methods->length(); 1816 1817 // Save original method_idnum in case of redefinition, which can change 1818 // the idnum of obsolete methods. The new method will have the same idnum 1819 // but if we refresh the methods array, the counts will be wrong. 1820 ResourceMark rm(THREAD); 1821 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1822 int num_methods = 0; 1823 1824 for (int i = 0; i < methods_length; i++) { 1825 methodHandle method(THREAD, methods->at(i)); 1826 if (select_method(method, want_constructor)) { 1827 if (!publicOnly || method->is_public()) { 1828 idnums->push(method->method_idnum()); 1829 ++num_methods; 1830 } 1831 } 1832 } 1833 1834 // Allocate result 1835 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1836 objArrayHandle result (THREAD, r); 1837 1838 // Now just put the methods that we selected above, but go by their idnum 1839 // in case of redefinition. The methods can be redefined at any safepoint, 1840 // so above when allocating the oop array and below when creating reflect 1841 // objects. 1842 for (int i = 0; i < num_methods; i++) { 1843 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1844 if (method.is_null()) { 1845 // Method may have been deleted and seems this API can handle null 1846 // Otherwise should probably put a method that throws NSME 1847 result->obj_at_put(i, NULL); 1848 } else { 1849 oop m; 1850 if (want_constructor) { 1851 m = Reflection::new_constructor(method, CHECK_NULL); 1852 } else { 1853 m = Reflection::new_method(method, false, CHECK_NULL); 1854 } 1855 result->obj_at_put(i, m); 1856 } 1857 } 1858 1859 return (jobjectArray) JNIHandles::make_local(env, result()); 1860 } 1861 1862 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1863 { 1864 JVMWrapper("JVM_GetClassDeclaredMethods"); 1865 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1866 /*want_constructor*/ false, 1867 SystemDictionary::reflect_Method_klass(), THREAD); 1868 } 1869 JVM_END 1870 1871 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1872 { 1873 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1874 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1875 /*want_constructor*/ true, 1876 SystemDictionary::reflect_Constructor_klass(), THREAD); 1877 } 1878 JVM_END 1879 1880 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1881 { 1882 JVMWrapper("JVM_GetClassAccessFlags"); 1883 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1884 // Primitive type 1885 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1886 } 1887 1888 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1889 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1890 } 1891 JVM_END 1892 1893 1894 // Constant pool access ////////////////////////////////////////////////////////// 1895 1896 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1897 { 1898 JVMWrapper("JVM_GetClassConstantPool"); 1899 JvmtiVMObjectAllocEventCollector oam; 1900 1901 // Return null for primitives and arrays 1902 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1903 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1904 if (k->oop_is_instance()) { 1905 instanceKlassHandle k_h(THREAD, k); 1906 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL); 1907 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1908 return JNIHandles::make_local(jcp()); 1909 } 1910 } 1911 return NULL; 1912 } 1913 JVM_END 1914 1915 1916 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1917 { 1918 JVMWrapper("JVM_ConstantPoolGetSize"); 1919 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1920 return cp->length(); 1921 } 1922 JVM_END 1923 1924 1925 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1926 { 1927 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1928 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1929 bounds_check(cp, index, CHECK_NULL); 1930 constantTag tag = cp->tag_at(index); 1931 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1932 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1933 } 1934 Klass* k = cp->klass_at(index, CHECK_NULL); 1935 return (jclass) JNIHandles::make_local(k->java_mirror()); 1936 } 1937 JVM_END 1938 1939 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1940 { 1941 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1942 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1943 bounds_check(cp, index, CHECK_NULL); 1944 constantTag tag = cp->tag_at(index); 1945 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1946 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1947 } 1948 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1949 if (k == NULL) return NULL; 1950 return (jclass) JNIHandles::make_local(k->java_mirror()); 1951 } 1952 JVM_END 1953 1954 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1955 constantTag tag = cp->tag_at(index); 1956 if (!tag.is_method() && !tag.is_interface_method()) { 1957 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1958 } 1959 int klass_ref = cp->uncached_klass_ref_index_at(index); 1960 Klass* k_o; 1961 if (force_resolution) { 1962 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1963 } else { 1964 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1965 if (k_o == NULL) return NULL; 1966 } 1967 instanceKlassHandle k(THREAD, k_o); 1968 Symbol* name = cp->uncached_name_ref_at(index); 1969 Symbol* sig = cp->uncached_signature_ref_at(index); 1970 methodHandle m (THREAD, k->find_method(name, sig)); 1971 if (m.is_null()) { 1972 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1973 } 1974 oop method; 1975 if (!m->is_initializer() || m->is_static()) { 1976 method = Reflection::new_method(m, true, CHECK_NULL); 1977 } else { 1978 method = Reflection::new_constructor(m, CHECK_NULL); 1979 } 1980 return JNIHandles::make_local(method); 1981 } 1982 1983 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1984 { 1985 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1986 JvmtiVMObjectAllocEventCollector oam; 1987 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1988 bounds_check(cp, index, CHECK_NULL); 1989 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1990 return res; 1991 } 1992 JVM_END 1993 1994 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1995 { 1996 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 1997 JvmtiVMObjectAllocEventCollector oam; 1998 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1999 bounds_check(cp, index, CHECK_NULL); 2000 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2001 return res; 2002 } 2003 JVM_END 2004 2005 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2006 constantTag tag = cp->tag_at(index); 2007 if (!tag.is_field()) { 2008 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2009 } 2010 int klass_ref = cp->uncached_klass_ref_index_at(index); 2011 Klass* k_o; 2012 if (force_resolution) { 2013 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2014 } else { 2015 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2016 if (k_o == NULL) return NULL; 2017 } 2018 instanceKlassHandle k(THREAD, k_o); 2019 Symbol* name = cp->uncached_name_ref_at(index); 2020 Symbol* sig = cp->uncached_signature_ref_at(index); 2021 fieldDescriptor fd; 2022 Klass* target_klass = k->find_field(name, sig, &fd); 2023 if (target_klass == NULL) { 2024 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2025 } 2026 oop field = Reflection::new_field(&fd, CHECK_NULL); 2027 return JNIHandles::make_local(field); 2028 } 2029 2030 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2031 { 2032 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2033 JvmtiVMObjectAllocEventCollector oam; 2034 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2035 bounds_check(cp, index, CHECK_NULL); 2036 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2037 return res; 2038 } 2039 JVM_END 2040 2041 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2042 { 2043 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2044 JvmtiVMObjectAllocEventCollector oam; 2045 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2046 bounds_check(cp, index, CHECK_NULL); 2047 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2048 return res; 2049 } 2050 JVM_END 2051 2052 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2053 { 2054 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2055 JvmtiVMObjectAllocEventCollector oam; 2056 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2057 bounds_check(cp, index, CHECK_NULL); 2058 constantTag tag = cp->tag_at(index); 2059 if (!tag.is_field_or_method()) { 2060 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2061 } 2062 int klass_ref = cp->uncached_klass_ref_index_at(index); 2063 Symbol* klass_name = cp->klass_name_at(klass_ref); 2064 Symbol* member_name = cp->uncached_name_ref_at(index); 2065 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2066 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2067 objArrayHandle dest(THREAD, dest_o); 2068 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2069 dest->obj_at_put(0, str()); 2070 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2071 dest->obj_at_put(1, str()); 2072 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2073 dest->obj_at_put(2, str()); 2074 return (jobjectArray) JNIHandles::make_local(dest()); 2075 } 2076 JVM_END 2077 2078 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2079 { 2080 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2081 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2082 bounds_check(cp, index, CHECK_0); 2083 constantTag tag = cp->tag_at(index); 2084 if (!tag.is_int()) { 2085 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2086 } 2087 return cp->int_at(index); 2088 } 2089 JVM_END 2090 2091 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2092 { 2093 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2094 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2095 bounds_check(cp, index, CHECK_(0L)); 2096 constantTag tag = cp->tag_at(index); 2097 if (!tag.is_long()) { 2098 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2099 } 2100 return cp->long_at(index); 2101 } 2102 JVM_END 2103 2104 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2105 { 2106 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2107 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2108 bounds_check(cp, index, CHECK_(0.0f)); 2109 constantTag tag = cp->tag_at(index); 2110 if (!tag.is_float()) { 2111 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2112 } 2113 return cp->float_at(index); 2114 } 2115 JVM_END 2116 2117 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2118 { 2119 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2120 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2121 bounds_check(cp, index, CHECK_(0.0)); 2122 constantTag tag = cp->tag_at(index); 2123 if (!tag.is_double()) { 2124 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2125 } 2126 return cp->double_at(index); 2127 } 2128 JVM_END 2129 2130 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2131 { 2132 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2133 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2134 bounds_check(cp, index, CHECK_NULL); 2135 constantTag tag = cp->tag_at(index); 2136 if (!tag.is_string()) { 2137 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2138 } 2139 oop str = cp->string_at(index, CHECK_NULL); 2140 return (jstring) JNIHandles::make_local(str); 2141 } 2142 JVM_END 2143 2144 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2145 { 2146 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2147 JvmtiVMObjectAllocEventCollector oam; 2148 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2149 bounds_check(cp, index, CHECK_NULL); 2150 constantTag tag = cp->tag_at(index); 2151 if (!tag.is_symbol()) { 2152 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2153 } 2154 Symbol* sym = cp->symbol_at(index); 2155 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2156 return (jstring) JNIHandles::make_local(str()); 2157 } 2158 JVM_END 2159 2160 2161 // Assertion support. ////////////////////////////////////////////////////////// 2162 2163 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2164 JVMWrapper("JVM_DesiredAssertionStatus"); 2165 assert(cls != NULL, "bad class"); 2166 2167 oop r = JNIHandles::resolve(cls); 2168 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2169 if (java_lang_Class::is_primitive(r)) return false; 2170 2171 Klass* k = java_lang_Class::as_Klass(r); 2172 assert(k->oop_is_instance(), "must be an instance klass"); 2173 if (! k->oop_is_instance()) return false; 2174 2175 ResourceMark rm(THREAD); 2176 const char* name = k->name()->as_C_string(); 2177 bool system_class = k->class_loader() == NULL; 2178 return JavaAssertions::enabled(name, system_class); 2179 2180 JVM_END 2181 2182 2183 // Return a new AssertionStatusDirectives object with the fields filled in with 2184 // command-line assertion arguments (i.e., -ea, -da). 2185 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2186 JVMWrapper("JVM_AssertionStatusDirectives"); 2187 JvmtiVMObjectAllocEventCollector oam; 2188 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2189 return JNIHandles::make_local(env, asd); 2190 JVM_END 2191 2192 // Verification //////////////////////////////////////////////////////////////////////////////// 2193 2194 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2195 2196 // RedefineClasses support: bug 6214132 caused verification to fail. 2197 // All functions from this section should call the jvmtiThreadSate function: 2198 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2199 // The function returns a Klass* of the _scratch_class if the verifier 2200 // was invoked in the middle of the class redefinition. 2201 // Otherwise it returns its argument value which is the _the_class Klass*. 2202 // Please, refer to the description in the jvmtiThreadSate.hpp. 2203 2204 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2205 JVMWrapper("JVM_GetClassNameUTF"); 2206 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2207 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2208 return k->name()->as_utf8(); 2209 JVM_END 2210 2211 2212 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2213 JVMWrapper("JVM_GetClassCPTypes"); 2214 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2215 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2216 // types will have length zero if this is not an InstanceKlass 2217 // (length is determined by call to JVM_GetClassCPEntriesCount) 2218 if (k->oop_is_instance()) { 2219 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2220 for (int index = cp->length() - 1; index >= 0; index--) { 2221 constantTag tag = cp->tag_at(index); 2222 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2223 } 2224 } 2225 JVM_END 2226 2227 2228 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2229 JVMWrapper("JVM_GetClassCPEntriesCount"); 2230 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2231 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2232 if (!k->oop_is_instance()) 2233 return 0; 2234 return InstanceKlass::cast(k)->constants()->length(); 2235 JVM_END 2236 2237 2238 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2239 JVMWrapper("JVM_GetClassFieldsCount"); 2240 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2241 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2242 if (!k->oop_is_instance()) 2243 return 0; 2244 return InstanceKlass::cast(k)->java_fields_count(); 2245 JVM_END 2246 2247 2248 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2249 JVMWrapper("JVM_GetClassMethodsCount"); 2250 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2251 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2252 if (!k->oop_is_instance()) 2253 return 0; 2254 return InstanceKlass::cast(k)->methods()->length(); 2255 JVM_END 2256 2257 2258 // The following methods, used for the verifier, are never called with 2259 // array klasses, so a direct cast to InstanceKlass is safe. 2260 // Typically, these methods are called in a loop with bounds determined 2261 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2262 // zero for arrays. 2263 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2264 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2265 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2266 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2267 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2268 int length = method->checked_exceptions_length(); 2269 if (length > 0) { 2270 CheckedExceptionElement* table= method->checked_exceptions_start(); 2271 for (int i = 0; i < length; i++) { 2272 exceptions[i] = table[i].class_cp_index; 2273 } 2274 } 2275 JVM_END 2276 2277 2278 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2279 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2280 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2281 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2282 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2283 return method->checked_exceptions_length(); 2284 JVM_END 2285 2286 2287 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2288 JVMWrapper("JVM_GetMethodIxByteCode"); 2289 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2290 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2291 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2292 memcpy(code, method->code_base(), method->code_size()); 2293 JVM_END 2294 2295 2296 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2297 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2298 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2299 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2300 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2301 return method->code_size(); 2302 JVM_END 2303 2304 2305 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2306 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2307 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2308 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2309 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2310 ExceptionTable extable(method); 2311 entry->start_pc = extable.start_pc(entry_index); 2312 entry->end_pc = extable.end_pc(entry_index); 2313 entry->handler_pc = extable.handler_pc(entry_index); 2314 entry->catchType = extable.catch_type_index(entry_index); 2315 JVM_END 2316 2317 2318 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2319 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2320 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2321 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2322 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2323 return method->exception_table_length(); 2324 JVM_END 2325 2326 2327 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2328 JVMWrapper("JVM_GetMethodIxModifiers"); 2329 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2330 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2331 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2332 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2333 JVM_END 2334 2335 2336 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2337 JVMWrapper("JVM_GetFieldIxModifiers"); 2338 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2339 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2340 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2341 JVM_END 2342 2343 2344 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2345 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2346 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2347 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2348 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2349 return method->max_locals(); 2350 JVM_END 2351 2352 2353 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2354 JVMWrapper("JVM_GetMethodIxArgsSize"); 2355 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2356 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2357 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2358 return method->size_of_parameters(); 2359 JVM_END 2360 2361 2362 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2363 JVMWrapper("JVM_GetMethodIxMaxStack"); 2364 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2365 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2366 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2367 return method->verifier_max_stack(); 2368 JVM_END 2369 2370 2371 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2372 JVMWrapper("JVM_IsConstructorIx"); 2373 ResourceMark rm(THREAD); 2374 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2375 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2376 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2377 return method->name() == vmSymbols::object_initializer_name(); 2378 JVM_END 2379 2380 2381 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2382 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2383 ResourceMark rm(THREAD); 2384 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2385 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2386 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2387 return method->is_overpass(); 2388 JVM_END 2389 2390 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2391 JVMWrapper("JVM_GetMethodIxIxUTF"); 2392 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2393 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2394 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2395 return method->name()->as_utf8(); 2396 JVM_END 2397 2398 2399 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2400 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2401 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2402 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2403 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2404 return method->signature()->as_utf8(); 2405 JVM_END 2406 2407 /** 2408 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2409 * read entries in the constant pool. Since the old verifier always 2410 * works on a copy of the code, it will not see any rewriting that 2411 * may possibly occur in the middle of verification. So it is important 2412 * that nothing it calls tries to use the cpCache instead of the raw 2413 * constant pool, so we must use cp->uncached_x methods when appropriate. 2414 */ 2415 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2416 JVMWrapper("JVM_GetCPFieldNameUTF"); 2417 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2418 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2419 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2420 switch (cp->tag_at(cp_index).value()) { 2421 case JVM_CONSTANT_Fieldref: 2422 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2423 default: 2424 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2425 } 2426 ShouldNotReachHere(); 2427 return NULL; 2428 JVM_END 2429 2430 2431 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2432 JVMWrapper("JVM_GetCPMethodNameUTF"); 2433 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2434 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2435 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2436 switch (cp->tag_at(cp_index).value()) { 2437 case JVM_CONSTANT_InterfaceMethodref: 2438 case JVM_CONSTANT_Methodref: 2439 case JVM_CONSTANT_NameAndType: // for invokedynamic 2440 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2441 default: 2442 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2443 } 2444 ShouldNotReachHere(); 2445 return NULL; 2446 JVM_END 2447 2448 2449 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2450 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2451 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2452 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2453 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2454 switch (cp->tag_at(cp_index).value()) { 2455 case JVM_CONSTANT_InterfaceMethodref: 2456 case JVM_CONSTANT_Methodref: 2457 case JVM_CONSTANT_NameAndType: // for invokedynamic 2458 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2459 default: 2460 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2461 } 2462 ShouldNotReachHere(); 2463 return NULL; 2464 JVM_END 2465 2466 2467 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2468 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2469 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2470 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2471 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2472 switch (cp->tag_at(cp_index).value()) { 2473 case JVM_CONSTANT_Fieldref: 2474 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2475 default: 2476 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2477 } 2478 ShouldNotReachHere(); 2479 return NULL; 2480 JVM_END 2481 2482 2483 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2484 JVMWrapper("JVM_GetCPClassNameUTF"); 2485 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2486 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2487 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2488 Symbol* classname = cp->klass_name_at(cp_index); 2489 return classname->as_utf8(); 2490 JVM_END 2491 2492 2493 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2494 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2495 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2496 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2497 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2498 switch (cp->tag_at(cp_index).value()) { 2499 case JVM_CONSTANT_Fieldref: { 2500 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2501 Symbol* classname = cp->klass_name_at(class_index); 2502 return classname->as_utf8(); 2503 } 2504 default: 2505 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2506 } 2507 ShouldNotReachHere(); 2508 return NULL; 2509 JVM_END 2510 2511 2512 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2513 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2514 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2515 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2516 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2517 switch (cp->tag_at(cp_index).value()) { 2518 case JVM_CONSTANT_Methodref: 2519 case JVM_CONSTANT_InterfaceMethodref: { 2520 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2521 Symbol* classname = cp->klass_name_at(class_index); 2522 return classname->as_utf8(); 2523 } 2524 default: 2525 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2526 } 2527 ShouldNotReachHere(); 2528 return NULL; 2529 JVM_END 2530 2531 2532 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2533 JVMWrapper("JVM_GetCPFieldModifiers"); 2534 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2535 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2536 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2537 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2538 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2539 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2540 switch (cp->tag_at(cp_index).value()) { 2541 case JVM_CONSTANT_Fieldref: { 2542 Symbol* name = cp->uncached_name_ref_at(cp_index); 2543 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2544 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) { 2545 if (fs.name() == name && fs.signature() == signature) { 2546 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2547 } 2548 } 2549 return -1; 2550 } 2551 default: 2552 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2553 } 2554 ShouldNotReachHere(); 2555 return 0; 2556 JVM_END 2557 2558 2559 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2560 JVMWrapper("JVM_GetCPMethodModifiers"); 2561 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2562 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2563 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2564 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2565 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2566 switch (cp->tag_at(cp_index).value()) { 2567 case JVM_CONSTANT_Methodref: 2568 case JVM_CONSTANT_InterfaceMethodref: { 2569 Symbol* name = cp->uncached_name_ref_at(cp_index); 2570 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2571 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2572 int methods_count = methods->length(); 2573 for (int i = 0; i < methods_count; i++) { 2574 Method* method = methods->at(i); 2575 if (method->name() == name && method->signature() == signature) { 2576 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2577 } 2578 } 2579 return -1; 2580 } 2581 default: 2582 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2583 } 2584 ShouldNotReachHere(); 2585 return 0; 2586 JVM_END 2587 2588 2589 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2590 2591 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2592 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2593 JVM_END 2594 2595 2596 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2597 JVMWrapper("JVM_IsSameClassPackage"); 2598 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2599 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2600 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2601 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2602 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2603 JVM_END 2604 2605 // Printing support ////////////////////////////////////////////////// 2606 extern "C" { 2607 2608 ATTRIBUTE_PRINTF(3, 0) 2609 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2610 // see bug 4399518, 4417214 2611 if ((intptr_t)count <= 0) return -1; 2612 2613 int result = vsnprintf(str, count, fmt, args); 2614 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2615 // characters which would have been written had the buffer been large 2616 // enough; on Windows, it returns -1. We handle both cases here and 2617 // always return -1, and perform null termination. 2618 if ((result > 0 && (size_t)result >= count) || result == -1) { 2619 str[count - 1] = '\0'; 2620 result = -1; 2621 } 2622 2623 return result; 2624 } 2625 2626 ATTRIBUTE_PRINTF(3, 0) 2627 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2628 va_list args; 2629 int len; 2630 va_start(args, fmt); 2631 len = jio_vsnprintf(str, count, fmt, args); 2632 va_end(args); 2633 return len; 2634 } 2635 2636 ATTRIBUTE_PRINTF(2,3) 2637 int jio_fprintf(FILE* f, const char *fmt, ...) { 2638 int len; 2639 va_list args; 2640 va_start(args, fmt); 2641 len = jio_vfprintf(f, fmt, args); 2642 va_end(args); 2643 return len; 2644 } 2645 2646 ATTRIBUTE_PRINTF(2, 0) 2647 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2648 if (Arguments::vfprintf_hook() != NULL) { 2649 return Arguments::vfprintf_hook()(f, fmt, args); 2650 } else { 2651 return vfprintf(f, fmt, args); 2652 } 2653 } 2654 2655 ATTRIBUTE_PRINTF(1, 2) 2656 JNIEXPORT int jio_printf(const char *fmt, ...) { 2657 int len; 2658 va_list args; 2659 va_start(args, fmt); 2660 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2661 va_end(args); 2662 return len; 2663 } 2664 2665 2666 // HotSpot specific jio method 2667 void jio_print(const char* s) { 2668 // Try to make this function as atomic as possible. 2669 if (Arguments::vfprintf_hook() != NULL) { 2670 jio_fprintf(defaultStream::output_stream(), "%s", s); 2671 } else { 2672 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2673 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2674 } 2675 } 2676 2677 } // Extern C 2678 2679 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2680 2681 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 2682 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or 2683 // OSThread objects. The exception to this rule is when the target object is the thread 2684 // doing the operation, in which case we know that the thread won't exit until the 2685 // operation is done (all exits being voluntary). There are a few cases where it is 2686 // rather silly to do operations on yourself, like resuming yourself or asking whether 2687 // you are alive. While these can still happen, they are not subject to deadlocks if 2688 // the lock is held while the operation occurs (this is not the case for suspend, for 2689 // instance), and are very unlikely. Because IsAlive needs to be fast and its 2690 // implementation is local to this file, we always lock Threads_lock for that one. 2691 2692 static void thread_entry(JavaThread* thread, TRAPS) { 2693 HandleMark hm(THREAD); 2694 Handle obj(THREAD, thread->threadObj()); 2695 JavaValue result(T_VOID); 2696 JavaCalls::call_virtual(&result, 2697 obj, 2698 KlassHandle(THREAD, SystemDictionary::Thread_klass()), 2699 vmSymbols::run_method_name(), 2700 vmSymbols::void_method_signature(), 2701 THREAD); 2702 } 2703 2704 2705 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2706 JVMWrapper("JVM_StartThread"); 2707 JavaThread *native_thread = NULL; 2708 2709 // We cannot hold the Threads_lock when we throw an exception, 2710 // due to rank ordering issues. Example: we might need to grab the 2711 // Heap_lock while we construct the exception. 2712 bool throw_illegal_thread_state = false; 2713 2714 // We must release the Threads_lock before we can post a jvmti event 2715 // in Thread::start. 2716 { 2717 // Ensure that the C++ Thread and OSThread structures aren't freed before 2718 // we operate. 2719 MutexLocker mu(Threads_lock); 2720 2721 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2722 // re-starting an already started thread, so we should usually find 2723 // that the JavaThread is null. However for a JNI attached thread 2724 // there is a small window between the Thread object being created 2725 // (with its JavaThread set) and the update to its threadStatus, so we 2726 // have to check for this 2727 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2728 throw_illegal_thread_state = true; 2729 } else { 2730 // We could also check the stillborn flag to see if this thread was already stopped, but 2731 // for historical reasons we let the thread detect that itself when it starts running 2732 2733 jlong size = 2734 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2735 // Allocate the C++ Thread structure and create the native thread. The 2736 // stack size retrieved from java is signed, but the constructor takes 2737 // size_t (an unsigned type), so avoid passing negative values which would 2738 // result in really large stacks. 2739 size_t sz = size > 0 ? (size_t) size : 0; 2740 native_thread = new JavaThread(&thread_entry, sz); 2741 2742 // At this point it may be possible that no osthread was created for the 2743 // JavaThread due to lack of memory. Check for this situation and throw 2744 // an exception if necessary. Eventually we may want to change this so 2745 // that we only grab the lock if the thread was created successfully - 2746 // then we can also do this check and throw the exception in the 2747 // JavaThread constructor. 2748 if (native_thread->osthread() != NULL) { 2749 // Note: the current thread is not being used within "prepare". 2750 native_thread->prepare(jthread); 2751 } 2752 } 2753 } 2754 2755 if (throw_illegal_thread_state) { 2756 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2757 } 2758 2759 assert(native_thread != NULL, "Starting null thread?"); 2760 2761 if (native_thread->osthread() == NULL) { 2762 // No one should hold a reference to the 'native_thread'. 2763 delete native_thread; 2764 if (JvmtiExport::should_post_resource_exhausted()) { 2765 JvmtiExport::post_resource_exhausted( 2766 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2767 os::native_thread_creation_failed_msg()); 2768 } 2769 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2770 os::native_thread_creation_failed_msg()); 2771 } 2772 2773 Thread::start(native_thread); 2774 2775 JVM_END 2776 2777 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2778 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2779 // but is thought to be reliable and simple. In the case, where the receiver is the 2780 // same thread as the sender, no safepoint is needed. 2781 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2782 JVMWrapper("JVM_StopThread"); 2783 2784 oop java_throwable = JNIHandles::resolve(throwable); 2785 if (java_throwable == NULL) { 2786 THROW(vmSymbols::java_lang_NullPointerException()); 2787 } 2788 oop java_thread = JNIHandles::resolve_non_null(jthread); 2789 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2790 Events::log_exception(JavaThread::current(), 2791 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2792 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2793 // First check if thread is alive 2794 if (receiver != NULL) { 2795 // Check if exception is getting thrown at self (use oop equality, since the 2796 // target object might exit) 2797 if (java_thread == thread->threadObj()) { 2798 THROW_OOP(java_throwable); 2799 } else { 2800 // Enques a VM_Operation to stop all threads and then deliver the exception... 2801 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 2802 } 2803 } 2804 else { 2805 // Either: 2806 // - target thread has not been started before being stopped, or 2807 // - target thread already terminated 2808 // We could read the threadStatus to determine which case it is 2809 // but that is overkill as it doesn't matter. We must set the 2810 // stillborn flag for the first case, and if the thread has already 2811 // exited setting this flag has no affect 2812 java_lang_Thread::set_stillborn(java_thread); 2813 } 2814 JVM_END 2815 2816 2817 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2818 JVMWrapper("JVM_IsThreadAlive"); 2819 2820 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2821 return java_lang_Thread::is_alive(thread_oop); 2822 JVM_END 2823 2824 2825 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2826 JVMWrapper("JVM_SuspendThread"); 2827 oop java_thread = JNIHandles::resolve_non_null(jthread); 2828 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2829 2830 if (receiver != NULL) { 2831 // thread has run and has not exited (still on threads list) 2832 2833 { 2834 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2835 if (receiver->is_external_suspend()) { 2836 // Don't allow nested external suspend requests. We can't return 2837 // an error from this interface so just ignore the problem. 2838 return; 2839 } 2840 if (receiver->is_exiting()) { // thread is in the process of exiting 2841 return; 2842 } 2843 receiver->set_external_suspend(); 2844 } 2845 2846 // java_suspend() will catch threads in the process of exiting 2847 // and will ignore them. 2848 receiver->java_suspend(); 2849 2850 // It would be nice to have the following assertion in all the 2851 // time, but it is possible for a racing resume request to have 2852 // resumed this thread right after we suspended it. Temporarily 2853 // enable this assertion if you are chasing a different kind of 2854 // bug. 2855 // 2856 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2857 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2858 } 2859 JVM_END 2860 2861 2862 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2863 JVMWrapper("JVM_ResumeThread"); 2864 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 2865 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2866 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2867 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2868 // looks at it. 2869 MutexLocker ml(Threads_lock); 2870 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2871 if (thr != NULL) { 2872 // the thread has run and is not in the process of exiting 2873 thr->java_resume(); 2874 } 2875 JVM_END 2876 2877 2878 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2879 JVMWrapper("JVM_SetThreadPriority"); 2880 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2881 MutexLocker ml(Threads_lock); 2882 oop java_thread = JNIHandles::resolve_non_null(jthread); 2883 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2884 JavaThread* thr = java_lang_Thread::thread(java_thread); 2885 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 2886 Thread::set_priority(thr, (ThreadPriority)prio); 2887 } 2888 JVM_END 2889 2890 2891 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2892 JVMWrapper("JVM_Yield"); 2893 if (os::dont_yield()) return; 2894 HOTSPOT_THREAD_YIELD(); 2895 2896 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield. 2897 // Critical for similar threading behaviour 2898 if (ConvertYieldToSleep) { 2899 os::sleep(thread, MinSleepInterval, false); 2900 } else { 2901 os::naked_yield(); 2902 } 2903 JVM_END 2904 2905 2906 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2907 JVMWrapper("JVM_Sleep"); 2908 2909 if (millis < 0) { 2910 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2911 } 2912 2913 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2914 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2915 } 2916 2917 // Save current thread state and restore it at the end of this block. 2918 // And set new thread state to SLEEPING. 2919 JavaThreadSleepState jtss(thread); 2920 2921 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 2922 2923 EventThreadSleep event; 2924 2925 if (millis == 0) { 2926 // When ConvertSleepToYield is on, this matches the classic VM implementation of 2927 // JVM_Sleep. Critical for similar threading behaviour (Win32) 2928 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep 2929 // for SOLARIS 2930 if (ConvertSleepToYield) { 2931 os::naked_yield(); 2932 } else { 2933 ThreadState old_state = thread->osthread()->get_state(); 2934 thread->osthread()->set_state(SLEEPING); 2935 os::sleep(thread, MinSleepInterval, false); 2936 thread->osthread()->set_state(old_state); 2937 } 2938 } else { 2939 ThreadState old_state = thread->osthread()->get_state(); 2940 thread->osthread()->set_state(SLEEPING); 2941 if (os::sleep(thread, millis, true) == OS_INTRPT) { 2942 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 2943 // us while we were sleeping. We do not overwrite those. 2944 if (!HAS_PENDING_EXCEPTION) { 2945 if (event.should_commit()) { 2946 event.set_time(millis); 2947 event.commit(); 2948 } 2949 HOTSPOT_THREAD_SLEEP_END(1); 2950 2951 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 2952 // to properly restore the thread state. That's likely wrong. 2953 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2954 } 2955 } 2956 thread->osthread()->set_state(old_state); 2957 } 2958 if (event.should_commit()) { 2959 event.set_time(millis); 2960 event.commit(); 2961 } 2962 HOTSPOT_THREAD_SLEEP_END(0); 2963 JVM_END 2964 2965 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 2966 JVMWrapper("JVM_CurrentThread"); 2967 oop jthread = thread->threadObj(); 2968 assert (thread != NULL, "no current thread!"); 2969 return JNIHandles::make_local(env, jthread); 2970 JVM_END 2971 2972 2973 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 2974 JVMWrapper("JVM_CountStackFrames"); 2975 2976 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2977 oop java_thread = JNIHandles::resolve_non_null(jthread); 2978 bool throw_illegal_thread_state = false; 2979 int count = 0; 2980 2981 { 2982 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 2983 // We need to re-resolve the java_thread, since a GC might have happened during the 2984 // acquire of the lock 2985 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2986 2987 if (thr == NULL) { 2988 // do nothing 2989 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 2990 // Check whether this java thread has been suspended already. If not, throws 2991 // IllegalThreadStateException. We defer to throw that exception until 2992 // Threads_lock is released since loading exception class has to leave VM. 2993 // The correct way to test a thread is actually suspended is 2994 // wait_for_ext_suspend_completion(), but we can't call that while holding 2995 // the Threads_lock. The above tests are sufficient for our purposes 2996 // provided the walkability of the stack is stable - which it isn't 2997 // 100% but close enough for most practical purposes. 2998 throw_illegal_thread_state = true; 2999 } else { 3000 // Count all java activation, i.e., number of vframes 3001 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 3002 // Native frames are not counted 3003 if (!vfst.method()->is_native()) count++; 3004 } 3005 } 3006 } 3007 3008 if (throw_illegal_thread_state) { 3009 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3010 "this thread is not suspended"); 3011 } 3012 return count; 3013 JVM_END 3014 3015 // Consider: A better way to implement JVM_Interrupt() is to acquire 3016 // Threads_lock to resolve the jthread into a Thread pointer, fetch 3017 // Thread->platformevent, Thread->native_thr, Thread->parker, etc., 3018 // drop Threads_lock, and the perform the unpark() and thr_kill() operations 3019 // outside the critical section. Threads_lock is hot so we want to minimize 3020 // the hold-time. A cleaner interface would be to decompose interrupt into 3021 // two steps. The 1st phase, performed under Threads_lock, would return 3022 // a closure that'd be invoked after Threads_lock was dropped. 3023 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 3024 // admit spurious wakeups. 3025 3026 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3027 JVMWrapper("JVM_Interrupt"); 3028 3029 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3030 oop java_thread = JNIHandles::resolve_non_null(jthread); 3031 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3032 // We need to re-resolve the java_thread, since a GC might have happened during the 3033 // acquire of the lock 3034 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3035 if (thr != NULL) { 3036 Thread::interrupt(thr); 3037 } 3038 JVM_END 3039 3040 3041 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3042 JVMWrapper("JVM_IsInterrupted"); 3043 3044 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3045 oop java_thread = JNIHandles::resolve_non_null(jthread); 3046 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3047 // We need to re-resolve the java_thread, since a GC might have happened during the 3048 // acquire of the lock 3049 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3050 if (thr == NULL) { 3051 return JNI_FALSE; 3052 } else { 3053 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3054 } 3055 JVM_END 3056 3057 3058 // Return true iff the current thread has locked the object passed in 3059 3060 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3061 JVMWrapper("JVM_HoldsLock"); 3062 assert(THREAD->is_Java_thread(), "sanity check"); 3063 if (obj == NULL) { 3064 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3065 } 3066 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3067 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3068 JVM_END 3069 3070 3071 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3072 JVMWrapper("JVM_DumpAllStacks"); 3073 VM_PrintThreads op; 3074 VMThread::execute(&op); 3075 if (JvmtiExport::should_post_data_dump()) { 3076 JvmtiExport::post_data_dump(); 3077 } 3078 JVM_END 3079 3080 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3081 JVMWrapper("JVM_SetNativeThreadName"); 3082 ResourceMark rm(THREAD); 3083 oop java_thread = JNIHandles::resolve_non_null(jthread); 3084 JavaThread* thr = java_lang_Thread::thread(java_thread); 3085 // Thread naming only supported for the current thread, doesn't work for 3086 // target threads. 3087 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3088 // we don't set the name of an attached thread to avoid stepping 3089 // on other programs 3090 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3091 os::set_native_thread_name(thread_name); 3092 } 3093 JVM_END 3094 3095 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3096 3097 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3098 assert(jthread->is_Java_thread(), "must be a Java thread"); 3099 if (jthread->privileged_stack_top() == NULL) return false; 3100 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3101 oop loader = jthread->privileged_stack_top()->class_loader(); 3102 if (loader == NULL) return true; 3103 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3104 if (trusted) return true; 3105 } 3106 return false; 3107 } 3108 3109 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3110 JVMWrapper("JVM_CurrentLoadedClass"); 3111 ResourceMark rm(THREAD); 3112 3113 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3114 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3115 bool trusted = is_trusted_frame(thread, &vfst); 3116 if (trusted) return NULL; 3117 3118 Method* m = vfst.method(); 3119 if (!m->is_native()) { 3120 InstanceKlass* holder = m->method_holder(); 3121 oop loader = holder->class_loader(); 3122 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3123 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3124 } 3125 } 3126 } 3127 return NULL; 3128 JVM_END 3129 3130 3131 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3132 JVMWrapper("JVM_CurrentClassLoader"); 3133 ResourceMark rm(THREAD); 3134 3135 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3136 3137 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3138 bool trusted = is_trusted_frame(thread, &vfst); 3139 if (trusted) return NULL; 3140 3141 Method* m = vfst.method(); 3142 if (!m->is_native()) { 3143 InstanceKlass* holder = m->method_holder(); 3144 assert(holder->is_klass(), "just checking"); 3145 oop loader = holder->class_loader(); 3146 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3147 return JNIHandles::make_local(env, loader); 3148 } 3149 } 3150 } 3151 return NULL; 3152 JVM_END 3153 3154 3155 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3156 JVMWrapper("JVM_GetClassContext"); 3157 ResourceMark rm(THREAD); 3158 JvmtiVMObjectAllocEventCollector oam; 3159 vframeStream vfst(thread); 3160 3161 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3162 // This must only be called from SecurityManager.getClassContext 3163 Method* m = vfst.method(); 3164 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3165 m->name() == vmSymbols::getClassContext_name() && 3166 m->signature() == vmSymbols::void_class_array_signature())) { 3167 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3168 } 3169 } 3170 3171 // Collect method holders 3172 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>(); 3173 for (; !vfst.at_end(); vfst.security_next()) { 3174 Method* m = vfst.method(); 3175 // Native frames are not returned 3176 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3177 Klass* holder = m->method_holder(); 3178 assert(holder->is_klass(), "just checking"); 3179 klass_array->append(holder); 3180 } 3181 } 3182 3183 // Create result array of type [Ljava/lang/Class; 3184 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3185 // Fill in mirrors corresponding to method holders 3186 for (int i = 0; i < klass_array->length(); i++) { 3187 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3188 } 3189 3190 return (jobjectArray) JNIHandles::make_local(env, result); 3191 JVM_END 3192 3193 3194 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3195 JVMWrapper("JVM_ClassDepth"); 3196 ResourceMark rm(THREAD); 3197 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3198 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3199 3200 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3201 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3202 if (class_name_sym == NULL) { 3203 return -1; 3204 } 3205 3206 int depth = 0; 3207 3208 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3209 if (!vfst.method()->is_native()) { 3210 InstanceKlass* holder = vfst.method()->method_holder(); 3211 assert(holder->is_klass(), "just checking"); 3212 if (holder->name() == class_name_sym) { 3213 return depth; 3214 } 3215 depth++; 3216 } 3217 } 3218 return -1; 3219 JVM_END 3220 3221 3222 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3223 JVMWrapper("JVM_ClassLoaderDepth"); 3224 ResourceMark rm(THREAD); 3225 int depth = 0; 3226 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3227 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3228 bool trusted = is_trusted_frame(thread, &vfst); 3229 if (trusted) return -1; 3230 3231 Method* m = vfst.method(); 3232 if (!m->is_native()) { 3233 InstanceKlass* holder = m->method_holder(); 3234 assert(holder->is_klass(), "just checking"); 3235 oop loader = holder->class_loader(); 3236 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3237 return depth; 3238 } 3239 depth++; 3240 } 3241 } 3242 return -1; 3243 JVM_END 3244 3245 3246 // java.lang.Package //////////////////////////////////////////////////////////////// 3247 3248 3249 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3250 JVMWrapper("JVM_GetSystemPackage"); 3251 ResourceMark rm(THREAD); 3252 JvmtiVMObjectAllocEventCollector oam; 3253 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3254 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3255 return (jstring) JNIHandles::make_local(result); 3256 JVM_END 3257 3258 3259 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3260 JVMWrapper("JVM_GetSystemPackages"); 3261 JvmtiVMObjectAllocEventCollector oam; 3262 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3263 return (jobjectArray) JNIHandles::make_local(result); 3264 JVM_END 3265 3266 3267 // ObjectInputStream /////////////////////////////////////////////////////////////// 3268 3269 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3270 if (current_class == NULL) { 3271 return true; 3272 } 3273 if ((current_class == field_class) || access.is_public()) { 3274 return true; 3275 } 3276 3277 if (access.is_protected()) { 3278 // See if current_class is a subclass of field_class 3279 if (current_class->is_subclass_of(field_class)) { 3280 return true; 3281 } 3282 } 3283 3284 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3285 } 3286 3287 // Return the first non-null class loader up the execution stack, or null 3288 // if only code from the null class loader is on the stack. 3289 3290 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3291 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3292 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3293 oop loader = vfst.method()->method_holder()->class_loader(); 3294 if (loader != NULL) { 3295 return JNIHandles::make_local(env, loader); 3296 } 3297 } 3298 return NULL; 3299 JVM_END 3300 3301 3302 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3303 3304 3305 // resolve array handle and check arguments 3306 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3307 if (arr == NULL) { 3308 THROW_0(vmSymbols::java_lang_NullPointerException()); 3309 } 3310 oop a = JNIHandles::resolve_non_null(arr); 3311 if (!a->is_array()) { 3312 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3313 } else if (type_array_only && !a->is_typeArray()) { 3314 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3315 } 3316 return arrayOop(a); 3317 } 3318 3319 3320 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3321 JVMWrapper("JVM_GetArrayLength"); 3322 arrayOop a = check_array(env, arr, false, CHECK_0); 3323 return a->length(); 3324 JVM_END 3325 3326 3327 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3328 JVMWrapper("JVM_Array_Get"); 3329 JvmtiVMObjectAllocEventCollector oam; 3330 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3331 jvalue value; 3332 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3333 oop box = Reflection::box(&value, type, CHECK_NULL); 3334 return JNIHandles::make_local(env, box); 3335 JVM_END 3336 3337 3338 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3339 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3340 jvalue value; 3341 value.i = 0; // to initialize value before getting used in CHECK 3342 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3343 assert(a->is_typeArray(), "just checking"); 3344 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3345 BasicType wide_type = (BasicType) wCode; 3346 if (type != wide_type) { 3347 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3348 } 3349 return value; 3350 JVM_END 3351 3352 3353 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3354 JVMWrapper("JVM_SetArrayElement"); 3355 arrayOop a = check_array(env, arr, false, CHECK); 3356 oop box = JNIHandles::resolve(val); 3357 jvalue value; 3358 value.i = 0; // to initialize value before getting used in CHECK 3359 BasicType value_type; 3360 if (a->is_objArray()) { 3361 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3362 value_type = Reflection::unbox_for_regular_object(box, &value); 3363 } else { 3364 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3365 } 3366 Reflection::array_set(&value, a, index, value_type, CHECK); 3367 JVM_END 3368 3369 3370 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3371 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3372 arrayOop a = check_array(env, arr, true, CHECK); 3373 assert(a->is_typeArray(), "just checking"); 3374 BasicType value_type = (BasicType) vCode; 3375 Reflection::array_set(&v, a, index, value_type, CHECK); 3376 JVM_END 3377 3378 3379 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3380 JVMWrapper("JVM_NewArray"); 3381 JvmtiVMObjectAllocEventCollector oam; 3382 oop element_mirror = JNIHandles::resolve(eltClass); 3383 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3384 return JNIHandles::make_local(env, result); 3385 JVM_END 3386 3387 3388 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3389 JVMWrapper("JVM_NewMultiArray"); 3390 JvmtiVMObjectAllocEventCollector oam; 3391 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3392 oop element_mirror = JNIHandles::resolve(eltClass); 3393 assert(dim_array->is_typeArray(), "just checking"); 3394 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3395 return JNIHandles::make_local(env, result); 3396 JVM_END 3397 3398 3399 // Library support /////////////////////////////////////////////////////////////////////////// 3400 3401 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3402 //%note jvm_ct 3403 JVMWrapper2("JVM_LoadLibrary (%s)", name); 3404 char ebuf[1024]; 3405 void *load_result; 3406 { 3407 ThreadToNativeFromVM ttnfvm(thread); 3408 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3409 } 3410 if (load_result == NULL) { 3411 char msg[1024]; 3412 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3413 // Since 'ebuf' may contain a string encoded using 3414 // platform encoding scheme, we need to pass 3415 // Exceptions::unsafe_to_utf8 to the new_exception method 3416 // as the last argument. See bug 6367357. 3417 Handle h_exception = 3418 Exceptions::new_exception(thread, 3419 vmSymbols::java_lang_UnsatisfiedLinkError(), 3420 msg, Exceptions::unsafe_to_utf8); 3421 3422 THROW_HANDLE_0(h_exception); 3423 } 3424 return load_result; 3425 JVM_END 3426 3427 3428 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3429 JVMWrapper("JVM_UnloadLibrary"); 3430 os::dll_unload(handle); 3431 JVM_END 3432 3433 3434 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3435 JVMWrapper2("JVM_FindLibraryEntry (%s)", name); 3436 return os::dll_lookup(handle, name); 3437 JVM_END 3438 3439 3440 // JNI version /////////////////////////////////////////////////////////////////////////////// 3441 3442 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3443 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version); 3444 return Threads::is_supported_jni_version_including_1_1(version); 3445 JVM_END 3446 3447 3448 // String support /////////////////////////////////////////////////////////////////////////// 3449 3450 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3451 JVMWrapper("JVM_InternString"); 3452 JvmtiVMObjectAllocEventCollector oam; 3453 if (str == NULL) return NULL; 3454 oop string = JNIHandles::resolve_non_null(str); 3455 oop result = StringTable::intern(string, CHECK_NULL); 3456 return (jstring) JNIHandles::make_local(env, result); 3457 JVM_END 3458 3459 3460 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3461 3462 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3463 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3464 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3465 // that only works with java threads. 3466 3467 3468 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3469 VM_Exit::block_if_vm_exited(); 3470 JVMWrapper("JVM_RawMonitorCreate"); 3471 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3472 } 3473 3474 3475 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3476 VM_Exit::block_if_vm_exited(); 3477 JVMWrapper("JVM_RawMonitorDestroy"); 3478 delete ((Mutex*) mon); 3479 } 3480 3481 3482 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3483 VM_Exit::block_if_vm_exited(); 3484 JVMWrapper("JVM_RawMonitorEnter"); 3485 ((Mutex*) mon)->jvm_raw_lock(); 3486 return 0; 3487 } 3488 3489 3490 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3491 VM_Exit::block_if_vm_exited(); 3492 JVMWrapper("JVM_RawMonitorExit"); 3493 ((Mutex*) mon)->jvm_raw_unlock(); 3494 } 3495 3496 3497 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3498 3499 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3500 Handle loader, Handle protection_domain, 3501 jboolean throwError, TRAPS) { 3502 // Security Note: 3503 // The Java level wrapper will perform the necessary security check allowing 3504 // us to pass the NULL as the initiating class loader. The VM is responsible for 3505 // the checkPackageAccess relative to the initiating class loader via the 3506 // protection_domain. The protection_domain is passed as NULL by the java code 3507 // if there is no security manager in 3-arg Class.forName(). 3508 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3509 3510 KlassHandle klass_handle(THREAD, klass); 3511 // Check if we should initialize the class 3512 if (init && klass_handle->oop_is_instance()) { 3513 klass_handle->initialize(CHECK_NULL); 3514 } 3515 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror()); 3516 } 3517 3518 3519 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3520 3521 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3522 JVMWrapper("JVM_InvokeMethod"); 3523 Handle method_handle; 3524 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3525 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3526 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3527 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3528 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3529 jobject res = JNIHandles::make_local(env, result); 3530 if (JvmtiExport::should_post_vm_object_alloc()) { 3531 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3532 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3533 if (java_lang_Class::is_primitive(ret_type)) { 3534 // Only for primitive type vm allocates memory for java object. 3535 // See box() method. 3536 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3537 } 3538 } 3539 return res; 3540 } else { 3541 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3542 } 3543 JVM_END 3544 3545 3546 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3547 JVMWrapper("JVM_NewInstanceFromConstructor"); 3548 oop constructor_mirror = JNIHandles::resolve(c); 3549 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3550 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3551 jobject res = JNIHandles::make_local(env, result); 3552 if (JvmtiExport::should_post_vm_object_alloc()) { 3553 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3554 } 3555 return res; 3556 JVM_END 3557 3558 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3559 3560 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3561 JVMWrapper("JVM_SupportsCX8"); 3562 return VM_Version::supports_cx8(); 3563 JVM_END 3564 3565 // DTrace /////////////////////////////////////////////////////////////////// 3566 3567 JVM_ENTRY(jint, JVM_DTraceGetVersion(JNIEnv* env)) 3568 JVMWrapper("JVM_DTraceGetVersion"); 3569 return (jint)JVM_TRACING_DTRACE_VERSION; 3570 JVM_END 3571 3572 JVM_ENTRY(jlong,JVM_DTraceActivate( 3573 JNIEnv* env, jint version, jstring module_name, jint providers_count, 3574 JVM_DTraceProvider* providers)) 3575 JVMWrapper("JVM_DTraceActivate"); 3576 return DTraceJSDT::activate( 3577 version, module_name, providers_count, providers, THREAD); 3578 JVM_END 3579 3580 JVM_ENTRY(jboolean,JVM_DTraceIsProbeEnabled(JNIEnv* env, jmethodID method)) 3581 JVMWrapper("JVM_DTraceIsProbeEnabled"); 3582 return DTraceJSDT::is_probe_enabled(method); 3583 JVM_END 3584 3585 JVM_ENTRY(void,JVM_DTraceDispose(JNIEnv* env, jlong handle)) 3586 JVMWrapper("JVM_DTraceDispose"); 3587 DTraceJSDT::dispose(handle); 3588 JVM_END 3589 3590 JVM_ENTRY(jboolean,JVM_DTraceIsSupported(JNIEnv* env)) 3591 JVMWrapper("JVM_DTraceIsSupported"); 3592 return DTraceJSDT::is_supported(); 3593 JVM_END 3594 3595 // Returns an array of all live Thread objects (VM internal JavaThreads, 3596 // jvmti agent threads, and JNI attaching threads are skipped) 3597 // See CR 6404306 regarding JNI attaching threads 3598 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3599 ResourceMark rm(THREAD); 3600 ThreadsListEnumerator tle(THREAD, false, false); 3601 JvmtiVMObjectAllocEventCollector oam; 3602 3603 int num_threads = tle.num_threads(); 3604 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3605 objArrayHandle threads_ah(THREAD, r); 3606 3607 for (int i = 0; i < num_threads; i++) { 3608 Handle h = tle.get_threadObj(i); 3609 threads_ah->obj_at_put(i, h()); 3610 } 3611 3612 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3613 JVM_END 3614 3615 3616 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3617 // Return StackTraceElement[][], each element is the stack trace of a thread in 3618 // the corresponding entry in the given threads array 3619 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3620 JVMWrapper("JVM_DumpThreads"); 3621 JvmtiVMObjectAllocEventCollector oam; 3622 3623 // Check if threads is null 3624 if (threads == NULL) { 3625 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3626 } 3627 3628 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3629 objArrayHandle ah(THREAD, a); 3630 int num_threads = ah->length(); 3631 // check if threads is non-empty array 3632 if (num_threads == 0) { 3633 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3634 } 3635 3636 // check if threads is not an array of objects of Thread class 3637 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3638 if (k != SystemDictionary::Thread_klass()) { 3639 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3640 } 3641 3642 ResourceMark rm(THREAD); 3643 3644 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3645 for (int i = 0; i < num_threads; i++) { 3646 oop thread_obj = ah->obj_at(i); 3647 instanceHandle h(THREAD, (instanceOop) thread_obj); 3648 thread_handle_array->append(h); 3649 } 3650 3651 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3652 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3653 3654 JVM_END 3655 3656 // JVM monitoring and management support 3657 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3658 return Management::get_jmm_interface(version); 3659 JVM_END 3660 3661 // com.sun.tools.attach.VirtualMachine agent properties support 3662 // 3663 // Initialize the agent properties with the properties maintained in the VM 3664 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3665 JVMWrapper("JVM_InitAgentProperties"); 3666 ResourceMark rm; 3667 3668 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3669 3670 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3671 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3672 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3673 return properties; 3674 JVM_END 3675 3676 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3677 { 3678 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3679 JvmtiVMObjectAllocEventCollector oam; 3680 3681 if (ofClass == NULL) { 3682 return NULL; 3683 } 3684 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3685 // Special handling for primitive objects 3686 if (java_lang_Class::is_primitive(mirror())) { 3687 return NULL; 3688 } 3689 Klass* k = java_lang_Class::as_Klass(mirror()); 3690 if (!k->oop_is_instance()) { 3691 return NULL; 3692 } 3693 instanceKlassHandle ik_h(THREAD, k); 3694 int encl_method_class_idx = ik_h->enclosing_method_class_index(); 3695 if (encl_method_class_idx == 0) { 3696 return NULL; 3697 } 3698 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3699 objArrayHandle dest(THREAD, dest_o); 3700 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3701 dest->obj_at_put(0, enc_k->java_mirror()); 3702 int encl_method_method_idx = ik_h->enclosing_method_method_index(); 3703 if (encl_method_method_idx != 0) { 3704 Symbol* sym = ik_h->constants()->symbol_at( 3705 extract_low_short_from_int( 3706 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3707 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3708 dest->obj_at_put(1, str()); 3709 sym = ik_h->constants()->symbol_at( 3710 extract_high_short_from_int( 3711 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3712 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3713 dest->obj_at_put(2, str()); 3714 } 3715 return (jobjectArray) JNIHandles::make_local(dest()); 3716 } 3717 JVM_END 3718 3719 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3720 { 3721 memset(info, 0, info_size); 3722 3723 info->jvm_version = Abstract_VM_Version::jvm_version(); 3724 info->update_version = 0; /* 0 in HotSpot Express VM */ 3725 info->special_update_version = 0; /* 0 in HotSpot Express VM */ 3726 3727 // when we add a new capability in the jvm_version_info struct, we should also 3728 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3729 // counter defined in runtimeService.cpp. 3730 info->is_attachable = AttachListener::is_attach_supported(); 3731 } 3732 JVM_END