jvm.cpp revision 7418:ef7449e07592
1/* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/classLoader.hpp" 27#include "classfile/javaAssertions.hpp" 28#include "classfile/javaClasses.hpp" 29#include "classfile/stringTable.hpp" 30#include "classfile/systemDictionary.hpp" 31#if INCLUDE_CDS 32#include "classfile/sharedClassUtil.hpp" 33#include "classfile/systemDictionaryShared.hpp" 34#endif 35#include "classfile/vmSymbols.hpp" 36#include "gc_interface/collectedHeap.inline.hpp" 37#include "interpreter/bytecode.hpp" 38#include "memory/oopFactory.hpp" 39#include "memory/universe.inline.hpp" 40#include "oops/fieldStreams.hpp" 41#include "oops/instanceKlass.hpp" 42#include "oops/objArrayKlass.hpp" 43#include "oops/method.hpp" 44#include "prims/jvm.h" 45#include "prims/jvm_misc.hpp" 46#include "prims/jvmtiExport.hpp" 47#include "prims/jvmtiThreadState.hpp" 48#include "prims/nativeLookup.hpp" 49#include "prims/privilegedStack.hpp" 50#include "runtime/arguments.hpp" 51#include "runtime/atomic.inline.hpp" 52#include "runtime/dtraceJSDT.hpp" 53#include "runtime/handles.inline.hpp" 54#include "runtime/init.hpp" 55#include "runtime/interfaceSupport.hpp" 56#include "runtime/java.hpp" 57#include "runtime/javaCalls.hpp" 58#include "runtime/jfieldIDWorkaround.hpp" 59#include "runtime/orderAccess.inline.hpp" 60#include "runtime/os.inline.hpp" 61#include "runtime/perfData.hpp" 62#include "runtime/reflection.hpp" 63#include "runtime/thread.inline.hpp" 64#include "runtime/vframe.hpp" 65#include "runtime/vm_operations.hpp" 66#include "runtime/vm_version.hpp" 67#include "services/attachListener.hpp" 68#include "services/management.hpp" 69#include "services/threadService.hpp" 70#include "trace/tracing.hpp" 71#include "utilities/copy.hpp" 72#include "utilities/defaultStream.hpp" 73#include "utilities/dtrace.hpp" 74#include "utilities/events.hpp" 75#include "utilities/histogram.hpp" 76#include "utilities/top.hpp" 77#include "utilities/utf8.hpp" 78#ifdef TARGET_OS_FAMILY_linux 79# include "jvm_linux.h" 80#endif 81#ifdef TARGET_OS_FAMILY_solaris 82# include "jvm_solaris.h" 83#endif 84#ifdef TARGET_OS_FAMILY_windows 85# include "jvm_windows.h" 86#endif 87#ifdef TARGET_OS_FAMILY_aix 88# include "jvm_aix.h" 89#endif 90#ifdef TARGET_OS_FAMILY_bsd 91# include "jvm_bsd.h" 92#endif 93 94#include <errno.h> 95 96/* 97 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 98 such ctors and calls MUST NOT come between an oop declaration/init and its 99 usage because if objects are move this may cause various memory stomps, bus 100 errors and segfaults. Here is a cookbook for causing so called "naked oop 101 failures": 102 103 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 104 JVMWrapper("JVM_GetClassDeclaredFields"); 105 106 // Object address to be held directly in mirror & not visible to GC 107 oop mirror = JNIHandles::resolve_non_null(ofClass); 108 109 // If this ctor can hit a safepoint, moving objects around, then 110 ComplexConstructor foo; 111 112 // Boom! mirror may point to JUNK instead of the intended object 113 (some dereference of mirror) 114 115 // Here's another call that may block for GC, making mirror stale 116 MutexLocker ml(some_lock); 117 118 // And here's an initializer that can result in a stale oop 119 // all in one step. 120 oop o = call_that_can_throw_exception(TRAPS); 121 122 123 The solution is to keep the oop declaration BELOW the ctor or function 124 call that might cause a GC, do another resolve to reassign the oop, or 125 consider use of a Handle instead of an oop so there is immunity from object 126 motion. But note that the "QUICK" entries below do not have a handlemark 127 and thus can only support use of handles passed in. 128*/ 129 130static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 131 ResourceMark rm; 132 int line_number = -1; 133 const char * source_file = NULL; 134 const char * trace = "explicit"; 135 InstanceKlass* caller = NULL; 136 JavaThread* jthread = JavaThread::current(); 137 if (jthread->has_last_Java_frame()) { 138 vframeStream vfst(jthread); 139 140 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 141 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 142 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 143 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 144 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 145 146 Method* last_caller = NULL; 147 148 while (!vfst.at_end()) { 149 Method* m = vfst.method(); 150 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 151 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 152 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 153 break; 154 } 155 last_caller = m; 156 vfst.next(); 157 } 158 // if this is called from Class.forName0 and that is called from Class.forName, 159 // then print the caller of Class.forName. If this is Class.loadClass, then print 160 // that caller, otherwise keep quiet since this should be picked up elsewhere. 161 bool found_it = false; 162 if (!vfst.at_end() && 163 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 164 vfst.method()->name() == vmSymbols::forName0_name()) { 165 vfst.next(); 166 if (!vfst.at_end() && 167 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 168 vfst.method()->name() == vmSymbols::forName_name()) { 169 vfst.next(); 170 found_it = true; 171 } 172 } else if (last_caller != NULL && 173 last_caller->method_holder()->name() == 174 vmSymbols::java_lang_ClassLoader() && 175 (last_caller->name() == vmSymbols::loadClassInternal_name() || 176 last_caller->name() == vmSymbols::loadClass_name())) { 177 found_it = true; 178 } else if (!vfst.at_end()) { 179 if (vfst.method()->is_native()) { 180 // JNI call 181 found_it = true; 182 } 183 } 184 if (found_it && !vfst.at_end()) { 185 // found the caller 186 caller = vfst.method()->method_holder(); 187 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 188 if (line_number == -1) { 189 // show method name if it's a native method 190 trace = vfst.method()->name_and_sig_as_C_string(); 191 } 192 Symbol* s = caller->source_file_name(); 193 if (s != NULL) { 194 source_file = s->as_C_string(); 195 } 196 } 197 } 198 if (caller != NULL) { 199 if (to_class != caller) { 200 const char * from = caller->external_name(); 201 const char * to = to_class->external_name(); 202 // print in a single call to reduce interleaving between threads 203 if (source_file != NULL) { 204 tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace); 205 } else { 206 tty->print("RESOLVE %s %s (%s)\n", from, to, trace); 207 } 208 } 209 } 210} 211 212void trace_class_resolution(Klass* to_class) { 213 EXCEPTION_MARK; 214 trace_class_resolution_impl(to_class, THREAD); 215 if (HAS_PENDING_EXCEPTION) { 216 CLEAR_PENDING_EXCEPTION; 217 } 218} 219 220// Wrapper to trace JVM functions 221 222#ifdef ASSERT 223 class JVMTraceWrapper : public StackObj { 224 public: 225 JVMTraceWrapper(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) { 226 if (TraceJVMCalls) { 227 va_list ap; 228 va_start(ap, format); 229 tty->print("JVM "); 230 tty->vprint_cr(format, ap); 231 va_end(ap); 232 } 233 } 234 }; 235 236 Histogram* JVMHistogram; 237 volatile jint JVMHistogram_lock = 0; 238 239 class JVMHistogramElement : public HistogramElement { 240 public: 241 JVMHistogramElement(const char* name); 242 }; 243 244 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 245 _name = elementName; 246 uintx count = 0; 247 248 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 249 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 250 count +=1; 251 if ( (WarnOnStalledSpinLock > 0) 252 && (count % WarnOnStalledSpinLock == 0)) { 253 warning("JVMHistogram_lock seems to be stalled"); 254 } 255 } 256 } 257 258 if(JVMHistogram == NULL) 259 JVMHistogram = new Histogram("JVM Call Counts",100); 260 261 JVMHistogram->add_element(this); 262 Atomic::dec(&JVMHistogram_lock); 263 } 264 265 #define JVMCountWrapper(arg) \ 266 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 267 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 268 269 #define JVMWrapper(arg1) JVMCountWrapper(arg1); JVMTraceWrapper(arg1) 270 #define JVMWrapper2(arg1, arg2) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2) 271 #define JVMWrapper3(arg1, arg2, arg3) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3) 272 #define JVMWrapper4(arg1, arg2, arg3, arg4) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3, arg4) 273#else 274 #define JVMWrapper(arg1) 275 #define JVMWrapper2(arg1, arg2) 276 #define JVMWrapper3(arg1, arg2, arg3) 277 #define JVMWrapper4(arg1, arg2, arg3, arg4) 278#endif 279 280 281// Interface version ///////////////////////////////////////////////////////////////////// 282 283 284JVM_LEAF(jint, JVM_GetInterfaceVersion()) 285 return JVM_INTERFACE_VERSION; 286JVM_END 287 288 289// java.lang.System ////////////////////////////////////////////////////////////////////// 290 291 292JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 293 JVMWrapper("JVM_CurrentTimeMillis"); 294 return os::javaTimeMillis(); 295JVM_END 296 297JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 298 JVMWrapper("JVM_NanoTime"); 299 return os::javaTimeNanos(); 300JVM_END 301 302 303JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 304 jobject dst, jint dst_pos, jint length)) 305 JVMWrapper("JVM_ArrayCopy"); 306 // Check if we have null pointers 307 if (src == NULL || dst == NULL) { 308 THROW(vmSymbols::java_lang_NullPointerException()); 309 } 310 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 311 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 312 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop"); 313 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop"); 314 // Do copy 315 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 316JVM_END 317 318 319static void set_property(Handle props, const char* key, const char* value, TRAPS) { 320 JavaValue r(T_OBJECT); 321 // public synchronized Object put(Object key, Object value); 322 HandleMark hm(THREAD); 323 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 324 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 325 JavaCalls::call_virtual(&r, 326 props, 327 KlassHandle(THREAD, SystemDictionary::Properties_klass()), 328 vmSymbols::put_name(), 329 vmSymbols::object_object_object_signature(), 330 key_str, 331 value_str, 332 THREAD); 333} 334 335 336#define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 337 338 339JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 340 JVMWrapper("JVM_InitProperties"); 341 ResourceMark rm; 342 343 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 344 345 // System property list includes both user set via -D option and 346 // jvm system specific properties. 347 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 348 PUTPROP(props, p->key(), p->value()); 349 } 350 351 // Convert the -XX:MaxDirectMemorySize= command line flag 352 // to the sun.nio.MaxDirectMemorySize property. 353 // Do this after setting user properties to prevent people 354 // from setting the value with a -D option, as requested. 355 { 356 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 357 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 358 } else { 359 char as_chars[256]; 360 jio_snprintf(as_chars, sizeof(as_chars), UINTX_FORMAT, MaxDirectMemorySize); 361 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 362 } 363 } 364 365 // JVM monitoring and management support 366 // Add the sun.management.compiler property for the compiler's name 367 { 368#undef CSIZE 369#if defined(_LP64) || defined(_WIN64) 370 #define CSIZE "64-Bit " 371#else 372 #define CSIZE 373#endif // 64bit 374 375#ifdef TIERED 376 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 377#else 378#if defined(COMPILER1) 379 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 380#elif defined(COMPILER2) 381 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 382#else 383 const char* compiler_name = ""; 384#endif // compilers 385#endif // TIERED 386 387 if (*compiler_name != '\0' && 388 (Arguments::mode() != Arguments::_int)) { 389 PUTPROP(props, "sun.management.compiler", compiler_name); 390 } 391 } 392 393 return properties; 394JVM_END 395 396 397/* 398 * Return the temporary directory that the VM uses for the attach 399 * and perf data files. 400 * 401 * It is important that this directory is well-known and the 402 * same for all VM instances. It cannot be affected by configuration 403 * variables such as java.io.tmpdir. 404 */ 405JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 406 JVMWrapper("JVM_GetTemporaryDirectory"); 407 HandleMark hm(THREAD); 408 const char* temp_dir = os::get_temp_directory(); 409 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 410 return (jstring) JNIHandles::make_local(env, h()); 411JVM_END 412 413 414// java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 415 416extern volatile jint vm_created; 417 418JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 419 before_exit(thread); 420 vm_exit(code); 421JVM_END 422 423 424JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 425 JVMWrapper("JVM_GC"); 426 if (!DisableExplicitGC) { 427 Universe::heap()->collect(GCCause::_java_lang_system_gc); 428 } 429JVM_END 430 431 432JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 433 JVMWrapper("JVM_MaxObjectInspectionAge"); 434 return Universe::heap()->millis_since_last_gc(); 435JVM_END 436 437 438static inline jlong convert_size_t_to_jlong(size_t val) { 439 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 440 NOT_LP64 (return (jlong)val;) 441 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 442} 443 444JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 445 JVMWrapper("JVM_TotalMemory"); 446 size_t n = Universe::heap()->capacity(); 447 return convert_size_t_to_jlong(n); 448JVM_END 449 450 451JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 452 JVMWrapper("JVM_FreeMemory"); 453 CollectedHeap* ch = Universe::heap(); 454 size_t n; 455 { 456 MutexLocker x(Heap_lock); 457 n = ch->capacity() - ch->used(); 458 } 459 return convert_size_t_to_jlong(n); 460JVM_END 461 462 463JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 464 JVMWrapper("JVM_MaxMemory"); 465 size_t n = Universe::heap()->max_capacity(); 466 return convert_size_t_to_jlong(n); 467JVM_END 468 469 470JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 471 JVMWrapper("JVM_ActiveProcessorCount"); 472 return os::active_processor_count(); 473JVM_END 474 475 476 477// java.lang.Throwable ////////////////////////////////////////////////////// 478 479 480JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 481 JVMWrapper("JVM_FillInStackTrace"); 482 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 483 java_lang_Throwable::fill_in_stack_trace(exception); 484JVM_END 485 486 487JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable)) 488 JVMWrapper("JVM_GetStackTraceDepth"); 489 oop exception = JNIHandles::resolve(throwable); 490 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD); 491JVM_END 492 493 494JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index)) 495 JVMWrapper("JVM_GetStackTraceElement"); 496 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC 497 oop exception = JNIHandles::resolve(throwable); 498 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL); 499 return JNIHandles::make_local(env, element); 500JVM_END 501 502 503// java.lang.Object /////////////////////////////////////////////// 504 505 506JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 507 JVMWrapper("JVM_IHashCode"); 508 // as implemented in the classic virtual machine; return 0 if object is NULL 509 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 510JVM_END 511 512 513JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 514 JVMWrapper("JVM_MonitorWait"); 515 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 516 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 517 if (JvmtiExport::should_post_monitor_wait()) { 518 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 519 520 // The current thread already owns the monitor and it has not yet 521 // been added to the wait queue so the current thread cannot be 522 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 523 // event handler cannot accidentally consume an unpark() meant for 524 // the ParkEvent associated with this ObjectMonitor. 525 } 526 ObjectSynchronizer::wait(obj, ms, CHECK); 527JVM_END 528 529 530JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 531 JVMWrapper("JVM_MonitorNotify"); 532 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 533 ObjectSynchronizer::notify(obj, CHECK); 534JVM_END 535 536 537JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 538 JVMWrapper("JVM_MonitorNotifyAll"); 539 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 540 ObjectSynchronizer::notifyall(obj, CHECK); 541JVM_END 542 543 544JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 545 JVMWrapper("JVM_Clone"); 546 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 547 const KlassHandle klass (THREAD, obj->klass()); 548 JvmtiVMObjectAllocEventCollector oam; 549 550#ifdef ASSERT 551 // Just checking that the cloneable flag is set correct 552 if (obj->is_array()) { 553 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 554 } else { 555 guarantee(obj->is_instance(), "should be instanceOop"); 556 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 557 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 558 } 559#endif 560 561 // Check if class of obj supports the Cloneable interface. 562 // All arrays are considered to be cloneable (See JLS 20.1.5) 563 if (!klass->is_cloneable()) { 564 ResourceMark rm(THREAD); 565 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 566 } 567 568 // Make shallow object copy 569 const int size = obj->size(); 570 oop new_obj = NULL; 571 if (obj->is_array()) { 572 const int length = ((arrayOop)obj())->length(); 573 new_obj = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 574 } else { 575 new_obj = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 576 } 577 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread 578 // is modifying a reference field in the clonee, a non-oop-atomic copy might 579 // be suspended in the middle of copying the pointer and end up with parts 580 // of two different pointers in the field. Subsequent dereferences will crash. 581 // 4846409: an oop-copy of objects with long or double fields or arrays of same 582 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead 583 // of oops. We know objects are aligned on a minimum of an jlong boundary. 584 // The same is true of StubRoutines::object_copy and the various oop_copy 585 // variants, and of the code generated by the inline_native_clone intrinsic. 586 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); 587 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj, 588 (size_t)align_object_size(size) / HeapWordsPerLong); 589 // Clear the header 590 new_obj->init_mark(); 591 592 // Store check (mark entire object and let gc sort it out) 593 BarrierSet* bs = Universe::heap()->barrier_set(); 594 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); 595 bs->write_region(MemRegion((HeapWord*)new_obj, size)); 596 597 // Caution: this involves a java upcall, so the clone should be 598 // "gc-robust" by this stage. 599 if (klass->has_finalizer()) { 600 assert(obj->is_instance(), "should be instanceOop"); 601 new_obj = InstanceKlass::register_finalizer(instanceOop(new_obj), CHECK_NULL); 602 } 603 604 return JNIHandles::make_local(env, oop(new_obj)); 605JVM_END 606 607// java.io.File /////////////////////////////////////////////////////////////// 608 609JVM_LEAF(char*, JVM_NativePath(char* path)) 610 JVMWrapper2("JVM_NativePath (%s)", path); 611 return os::native_path(path); 612JVM_END 613 614 615// Misc. class handling /////////////////////////////////////////////////////////// 616 617 618JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 619 JVMWrapper("JVM_GetCallerClass"); 620 621 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 622 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 623 // temporarily for existing code to use until a replacement API is defined. 624 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 625 Klass* k = thread->security_get_caller_class(depth); 626 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 627 } 628 629 // Getting the class of the caller frame. 630 // 631 // The call stack at this point looks something like this: 632 // 633 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 634 // [1] [ @CallerSensitive API.method ] 635 // [.] [ (skipped intermediate frames) ] 636 // [n] [ caller ] 637 vframeStream vfst(thread); 638 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 639 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 640 Method* m = vfst.method(); 641 assert(m != NULL, "sanity"); 642 switch (n) { 643 case 0: 644 // This must only be called from Reflection.getCallerClass 645 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 646 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 647 } 648 // fall-through 649 case 1: 650 // Frame 0 and 1 must be caller sensitive. 651 if (!m->caller_sensitive()) { 652 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 653 } 654 break; 655 default: 656 if (!m->is_ignored_by_security_stack_walk()) { 657 // We have reached the desired frame; return the holder class. 658 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 659 } 660 break; 661 } 662 } 663 return NULL; 664JVM_END 665 666 667JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 668 JVMWrapper("JVM_FindPrimitiveClass"); 669 oop mirror = NULL; 670 BasicType t = name2type(utf); 671 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 672 mirror = Universe::java_mirror(t); 673 } 674 if (mirror == NULL) { 675 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 676 } else { 677 return (jclass) JNIHandles::make_local(env, mirror); 678 } 679JVM_END 680 681 682// Returns a class loaded by the bootstrap class loader; or null 683// if not found. ClassNotFoundException is not thrown. 684// 685// Rationale behind JVM_FindClassFromBootLoader 686// a> JVM_FindClassFromClassLoader was never exported in the export tables. 687// b> because of (a) java.dll has a direct dependecy on the unexported 688// private symbol "_JVM_FindClassFromClassLoader@20". 689// c> the launcher cannot use the private symbol as it dynamically opens 690// the entry point, so if something changes, the launcher will fail 691// unexpectedly at runtime, it is safest for the launcher to dlopen a 692// stable exported interface. 693// d> re-exporting JVM_FindClassFromClassLoader as public, will cause its 694// signature to change from _JVM_FindClassFromClassLoader@20 to 695// JVM_FindClassFromClassLoader and will not be backward compatible 696// with older JDKs. 697// Thus a public/stable exported entry point is the right solution, 698// public here means public in linker semantics, and is exported only 699// to the JDK, and is not intended to be a public API. 700 701JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 702 const char* name)) 703 JVMWrapper2("JVM_FindClassFromBootLoader %s", name); 704 705 // Java libraries should ensure that name is never null... 706 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 707 // It's impossible to create this class; the name cannot fit 708 // into the constant pool. 709 return NULL; 710 } 711 712 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 713 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 714 if (k == NULL) { 715 return NULL; 716 } 717 718 if (TraceClassResolution) { 719 trace_class_resolution(k); 720 } 721 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 722JVM_END 723 724// Not used; JVM_FindClassFromCaller replaces this. 725JVM_ENTRY(jclass, JVM_FindClassFromClassLoader(JNIEnv* env, const char* name, 726 jboolean init, jobject loader, 727 jboolean throwError)) 728 JVMWrapper3("JVM_FindClassFromClassLoader %s throw %s", name, 729 throwError ? "error" : "exception"); 730 // Java libraries should ensure that name is never null... 731 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 732 // It's impossible to create this class; the name cannot fit 733 // into the constant pool. 734 if (throwError) { 735 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 736 } else { 737 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 738 } 739 } 740 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 741 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 742 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 743 Handle(), throwError, THREAD); 744 745 if (TraceClassResolution && result != NULL) { 746 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 747 } 748 return result; 749JVM_END 750 751// Find a class with this name in this loader, using the caller's protection domain. 752JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 753 jboolean init, jobject loader, 754 jclass caller)) 755 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name); 756 // Java libraries should ensure that name is never null... 757 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 758 // It's impossible to create this class; the name cannot fit 759 // into the constant pool. 760 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 761 } 762 763 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 764 765 oop loader_oop = JNIHandles::resolve(loader); 766 oop from_class = JNIHandles::resolve(caller); 767 oop protection_domain = NULL; 768 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 769 // NPE. Put it in another way, the bootstrap class loader has all permission and 770 // thus no checkPackageAccess equivalence in the VM class loader. 771 // The caller is also passed as NULL by the java code if there is no security 772 // manager to avoid the performance cost of getting the calling class. 773 if (from_class != NULL && loader_oop != NULL) { 774 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 775 } 776 777 Handle h_loader(THREAD, loader_oop); 778 Handle h_prot(THREAD, protection_domain); 779 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 780 h_prot, false, THREAD); 781 782 if (TraceClassResolution && result != NULL) { 783 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 784 } 785 return result; 786JVM_END 787 788JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 789 jboolean init, jclass from)) 790 JVMWrapper2("JVM_FindClassFromClass %s", name); 791 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 792 // It's impossible to create this class; the name cannot fit 793 // into the constant pool. 794 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 795 } 796 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 797 oop from_class_oop = JNIHandles::resolve(from); 798 Klass* from_class = (from_class_oop == NULL) 799 ? (Klass*)NULL 800 : java_lang_Class::as_Klass(from_class_oop); 801 oop class_loader = NULL; 802 oop protection_domain = NULL; 803 if (from_class != NULL) { 804 class_loader = from_class->class_loader(); 805 protection_domain = from_class->protection_domain(); 806 } 807 Handle h_loader(THREAD, class_loader); 808 Handle h_prot (THREAD, protection_domain); 809 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 810 h_prot, true, thread); 811 812 if (TraceClassResolution && result != NULL) { 813 // this function is generally only used for class loading during verification. 814 ResourceMark rm; 815 oop from_mirror = JNIHandles::resolve_non_null(from); 816 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 817 const char * from_name = from_class->external_name(); 818 819 oop mirror = JNIHandles::resolve_non_null(result); 820 Klass* to_class = java_lang_Class::as_Klass(mirror); 821 const char * to = to_class->external_name(); 822 tty->print("RESOLVE %s %s (verification)\n", from_name, to); 823 } 824 825 return result; 826JVM_END 827 828static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 829 if (loader.is_null()) { 830 return; 831 } 832 833 // check whether the current caller thread holds the lock or not. 834 // If not, increment the corresponding counter 835 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 836 ObjectSynchronizer::owner_self) { 837 counter->inc(); 838 } 839} 840 841// common code for JVM_DefineClass() and JVM_DefineClassWithSource() 842// and JVM_DefineClassWithSourceCond() 843static jclass jvm_define_class_common(JNIEnv *env, const char *name, 844 jobject loader, const jbyte *buf, 845 jsize len, jobject pd, const char *source, 846 jboolean verify, TRAPS) { 847 if (source == NULL) source = "__JVM_DefineClass__"; 848 849 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 850 JavaThread* jt = (JavaThread*) THREAD; 851 852 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 853 ClassLoader::perf_define_appclass_selftime(), 854 ClassLoader::perf_define_appclasses(), 855 jt->get_thread_stat()->perf_recursion_counts_addr(), 856 jt->get_thread_stat()->perf_timers_addr(), 857 PerfClassTraceTime::DEFINE_CLASS); 858 859 if (UsePerfData) { 860 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 861 } 862 863 // Since exceptions can be thrown, class initialization can take place 864 // if name is NULL no check for class name in .class stream has to be made. 865 TempNewSymbol class_name = NULL; 866 if (name != NULL) { 867 const int str_len = (int)strlen(name); 868 if (str_len > Symbol::max_length()) { 869 // It's impossible to create this class; the name cannot fit 870 // into the constant pool. 871 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 872 } 873 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 874 } 875 876 ResourceMark rm(THREAD); 877 ClassFileStream st((u1*) buf, len, (char *)source); 878 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 879 if (UsePerfData) { 880 is_lock_held_by_thread(class_loader, 881 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 882 THREAD); 883 } 884 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 885 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader, 886 protection_domain, &st, 887 verify != 0, 888 CHECK_NULL); 889 890 if (TraceClassResolution && k != NULL) { 891 trace_class_resolution(k); 892 } 893 894 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 895} 896 897 898JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 899 JVMWrapper2("JVM_DefineClass %s", name); 900 901 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD); 902JVM_END 903 904 905JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 906 JVMWrapper2("JVM_DefineClassWithSource %s", name); 907 908 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD); 909JVM_END 910 911JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name, 912 jobject loader, const jbyte *buf, 913 jsize len, jobject pd, 914 const char *source, jboolean verify)) 915 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name); 916 917 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD); 918JVM_END 919 920JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 921 JVMWrapper("JVM_FindLoadedClass"); 922 ResourceMark rm(THREAD); 923 924 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 925 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 926 927 const char* str = java_lang_String::as_utf8_string(string()); 928 // Sanity check, don't expect null 929 if (str == NULL) return NULL; 930 931 const int str_len = (int)strlen(str); 932 if (str_len > Symbol::max_length()) { 933 // It's impossible to create this class; the name cannot fit 934 // into the constant pool. 935 return NULL; 936 } 937 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 938 939 // Security Note: 940 // The Java level wrapper will perform the necessary security check allowing 941 // us to pass the NULL as the initiating class loader. 942 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 943 if (UsePerfData) { 944 is_lock_held_by_thread(h_loader, 945 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 946 THREAD); 947 } 948 949 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 950 h_loader, 951 Handle(), 952 CHECK_NULL); 953#if INCLUDE_CDS 954 if (k == NULL) { 955 // If the class is not already loaded, try to see if it's in the shared 956 // archive for the current classloader (h_loader). 957 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class( 958 klass_name, h_loader, CHECK_NULL); 959 k = ik(); 960 } 961#endif 962 return (k == NULL) ? NULL : 963 (jclass) JNIHandles::make_local(env, k->java_mirror()); 964JVM_END 965 966 967// Reflection support ////////////////////////////////////////////////////////////////////////////// 968 969JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 970 assert (cls != NULL, "illegal class"); 971 JVMWrapper("JVM_GetClassName"); 972 JvmtiVMObjectAllocEventCollector oam; 973 ResourceMark rm(THREAD); 974 const char* name; 975 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 976 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 977 } else { 978 // Consider caching interned string in Klass 979 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 980 assert(k->is_klass(), "just checking"); 981 name = k->external_name(); 982 } 983 oop result = StringTable::intern((char*) name, CHECK_NULL); 984 return (jstring) JNIHandles::make_local(env, result); 985JVM_END 986 987 988JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 989 JVMWrapper("JVM_GetClassInterfaces"); 990 JvmtiVMObjectAllocEventCollector oam; 991 oop mirror = JNIHandles::resolve_non_null(cls); 992 993 // Special handling for primitive objects 994 if (java_lang_Class::is_primitive(mirror)) { 995 // Primitive objects does not have any interfaces 996 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 997 return (jobjectArray) JNIHandles::make_local(env, r); 998 } 999 1000 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror)); 1001 // Figure size of result array 1002 int size; 1003 if (klass->oop_is_instance()) { 1004 size = InstanceKlass::cast(klass())->local_interfaces()->length(); 1005 } else { 1006 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass"); 1007 size = 2; 1008 } 1009 1010 // Allocate result array 1011 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1012 objArrayHandle result (THREAD, r); 1013 // Fill in result 1014 if (klass->oop_is_instance()) { 1015 // Regular instance klass, fill in all local interfaces 1016 for (int index = 0; index < size; index++) { 1017 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index); 1018 result->obj_at_put(index, k->java_mirror()); 1019 } 1020 } else { 1021 // All arrays implement java.lang.Cloneable and java.io.Serializable 1022 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1023 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1024 } 1025 return (jobjectArray) JNIHandles::make_local(env, result()); 1026JVM_END 1027 1028 1029JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1030 JVMWrapper("JVM_IsInterface"); 1031 oop mirror = JNIHandles::resolve_non_null(cls); 1032 if (java_lang_Class::is_primitive(mirror)) { 1033 return JNI_FALSE; 1034 } 1035 Klass* k = java_lang_Class::as_Klass(mirror); 1036 jboolean result = k->is_interface(); 1037 assert(!result || k->oop_is_instance(), 1038 "all interfaces are instance types"); 1039 // The compiler intrinsic for isInterface tests the 1040 // Klass::_access_flags bits in the same way. 1041 return result; 1042JVM_END 1043 1044 1045JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1046 JVMWrapper("JVM_GetClassSigners"); 1047 JvmtiVMObjectAllocEventCollector oam; 1048 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1049 // There are no signers for primitive types 1050 return NULL; 1051 } 1052 1053 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1054 1055 // If there are no signers set in the class, or if the class 1056 // is an array, return NULL. 1057 if (signers == NULL) return NULL; 1058 1059 // copy of the signers array 1060 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1061 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1062 for (int index = 0; index < signers->length(); index++) { 1063 signers_copy->obj_at_put(index, signers->obj_at(index)); 1064 } 1065 1066 // return the copy 1067 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1068JVM_END 1069 1070 1071JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1072 JVMWrapper("JVM_SetClassSigners"); 1073 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1074 // This call is ignored for primitive types and arrays. 1075 // Signers are only set once, ClassLoader.java, and thus shouldn't 1076 // be called with an array. Only the bootstrap loader creates arrays. 1077 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1078 if (k->oop_is_instance()) { 1079 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1080 } 1081 } 1082JVM_END 1083 1084 1085JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1086 JVMWrapper("JVM_GetProtectionDomain"); 1087 if (JNIHandles::resolve(cls) == NULL) { 1088 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1089 } 1090 1091 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1092 // Primitive types does not have a protection domain. 1093 return NULL; 1094 } 1095 1096 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1097 return (jobject) JNIHandles::make_local(env, pd); 1098JVM_END 1099 1100 1101static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) { 1102 // If there is a security manager and protection domain, check the access 1103 // in the protection domain, otherwise it is authorized. 1104 if (java_lang_System::has_security_manager()) { 1105 1106 // For bootstrapping, if pd implies method isn't in the JDK, allow 1107 // this context to revert to older behavior. 1108 // In this case the isAuthorized field in AccessControlContext is also not 1109 // present. 1110 if (Universe::protection_domain_implies_method() == NULL) { 1111 return true; 1112 } 1113 1114 // Whitelist certain access control contexts 1115 if (java_security_AccessControlContext::is_authorized(context)) { 1116 return true; 1117 } 1118 1119 oop prot = klass->protection_domain(); 1120 if (prot != NULL) { 1121 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1122 // in the new wrapper. 1123 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1124 Handle h_prot(THREAD, prot); 1125 JavaValue result(T_BOOLEAN); 1126 JavaCallArguments args(h_prot); 1127 JavaCalls::call(&result, m, &args, CHECK_false); 1128 return (result.get_jboolean() != 0); 1129 } 1130 } 1131 return true; 1132} 1133 1134// Create an AccessControlContext with a protection domain with null codesource 1135// and null permissions - which gives no permissions. 1136oop create_dummy_access_control_context(TRAPS) { 1137 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass()); 1138 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1139 // Call constructor ProtectionDomain(null, null); 1140 JavaValue result(T_VOID); 1141 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass), 1142 vmSymbols::object_initializer_name(), 1143 vmSymbols::codesource_permissioncollection_signature(), 1144 Handle(), Handle(), CHECK_NULL); 1145 1146 // new ProtectionDomain[] {pd}; 1147 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1148 context->obj_at_put(0, obj()); 1149 1150 // new AccessControlContext(new ProtectionDomain[] {pd}) 1151 objArrayHandle h_context(THREAD, context); 1152 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1153 return acc; 1154} 1155 1156JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1157 JVMWrapper("JVM_DoPrivileged"); 1158 1159 if (action == NULL) { 1160 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1161 } 1162 1163 // Compute the frame initiating the do privileged operation and setup the privileged stack 1164 vframeStream vfst(thread); 1165 vfst.security_get_caller_frame(1); 1166 1167 if (vfst.at_end()) { 1168 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1169 } 1170 1171 Method* method = vfst.method(); 1172 instanceKlassHandle klass (THREAD, method->method_holder()); 1173 1174 // Check that action object understands "Object run()" 1175 Handle h_context; 1176 if (context != NULL) { 1177 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1178 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1179 if (!authorized) { 1180 // Create an unprivileged access control object and call it's run function 1181 // instead. 1182 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1183 h_context = Handle(THREAD, noprivs); 1184 } 1185 } 1186 1187 // Check that action object understands "Object run()" 1188 Handle object (THREAD, JNIHandles::resolve(action)); 1189 1190 // get run() method 1191 Method* m_oop = object->klass()->uncached_lookup_method( 1192 vmSymbols::run_method_name(), 1193 vmSymbols::void_object_signature(), 1194 Klass::normal); 1195 methodHandle m (THREAD, m_oop); 1196 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { 1197 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1198 } 1199 1200 // Stack allocated list of privileged stack elements 1201 PrivilegedElement pi; 1202 if (!vfst.at_end()) { 1203 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1204 thread->set_privileged_stack_top(&pi); 1205 } 1206 1207 1208 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1209 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1210 Handle pending_exception; 1211 JavaValue result(T_OBJECT); 1212 JavaCallArguments args(object); 1213 JavaCalls::call(&result, m, &args, THREAD); 1214 1215 // done with action, remove ourselves from the list 1216 if (!vfst.at_end()) { 1217 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1218 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1219 } 1220 1221 if (HAS_PENDING_EXCEPTION) { 1222 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1223 CLEAR_PENDING_EXCEPTION; 1224 // JVMTI has already reported the pending exception 1225 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1226 if (THREAD->is_Java_thread()) { 1227 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1228 } 1229 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1230 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1231 // Throw a java.security.PrivilegedActionException(Exception e) exception 1232 JavaCallArguments args(pending_exception); 1233 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1234 vmSymbols::exception_void_signature(), 1235 &args); 1236 } 1237 } 1238 1239 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1240 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1241JVM_END 1242 1243 1244// Returns the inherited_access_control_context field of the running thread. 1245JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1246 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1247 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1248 return JNIHandles::make_local(env, result); 1249JVM_END 1250 1251class RegisterArrayForGC { 1252 private: 1253 JavaThread *_thread; 1254 public: 1255 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1256 _thread = thread; 1257 _thread->register_array_for_gc(array); 1258 } 1259 1260 ~RegisterArrayForGC() { 1261 _thread->register_array_for_gc(NULL); 1262 } 1263}; 1264 1265 1266JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1267 JVMWrapper("JVM_GetStackAccessControlContext"); 1268 if (!UsePrivilegedStack) return NULL; 1269 1270 ResourceMark rm(THREAD); 1271 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1272 JvmtiVMObjectAllocEventCollector oam; 1273 1274 // count the protection domains on the execution stack. We collapse 1275 // duplicate consecutive protection domains into a single one, as 1276 // well as stopping when we hit a privileged frame. 1277 1278 // Use vframeStream to iterate through Java frames 1279 vframeStream vfst(thread); 1280 1281 oop previous_protection_domain = NULL; 1282 Handle privileged_context(thread, NULL); 1283 bool is_privileged = false; 1284 oop protection_domain = NULL; 1285 1286 for(; !vfst.at_end(); vfst.next()) { 1287 // get method of frame 1288 Method* method = vfst.method(); 1289 intptr_t* frame_id = vfst.frame_id(); 1290 1291 // check the privileged frames to see if we have a match 1292 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1293 // this frame is privileged 1294 is_privileged = true; 1295 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1296 protection_domain = thread->privileged_stack_top()->protection_domain(); 1297 } else { 1298 protection_domain = method->method_holder()->protection_domain(); 1299 } 1300 1301 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1302 local_array->push(protection_domain); 1303 previous_protection_domain = protection_domain; 1304 } 1305 1306 if (is_privileged) break; 1307 } 1308 1309 1310 // either all the domains on the stack were system domains, or 1311 // we had a privileged system domain 1312 if (local_array->is_empty()) { 1313 if (is_privileged && privileged_context.is_null()) return NULL; 1314 1315 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1316 return JNIHandles::make_local(env, result); 1317 } 1318 1319 // the resource area must be registered in case of a gc 1320 RegisterArrayForGC ragc(thread, local_array); 1321 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1322 local_array->length(), CHECK_NULL); 1323 objArrayHandle h_context(thread, context); 1324 for (int index = 0; index < local_array->length(); index++) { 1325 h_context->obj_at_put(index, local_array->at(index)); 1326 } 1327 1328 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1329 1330 return JNIHandles::make_local(env, result); 1331JVM_END 1332 1333 1334JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1335 JVMWrapper("JVM_IsArrayClass"); 1336 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1337 return (k != NULL) && k->oop_is_array() ? true : false; 1338JVM_END 1339 1340 1341JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1342 JVMWrapper("JVM_IsPrimitiveClass"); 1343 oop mirror = JNIHandles::resolve_non_null(cls); 1344 return (jboolean) java_lang_Class::is_primitive(mirror); 1345JVM_END 1346 1347 1348JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1349 JVMWrapper("JVM_GetClassModifiers"); 1350 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1351 // Primitive type 1352 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1353 } 1354 1355 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1356 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1357 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1358 return k->modifier_flags(); 1359JVM_END 1360 1361 1362// Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1363 1364JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1365 JvmtiVMObjectAllocEventCollector oam; 1366 // ofClass is a reference to a java_lang_Class object. The mirror object 1367 // of an InstanceKlass 1368 1369 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1370 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1371 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1372 return (jobjectArray)JNIHandles::make_local(env, result); 1373 } 1374 1375 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1376 InnerClassesIterator iter(k); 1377 1378 if (iter.length() == 0) { 1379 // Neither an inner nor outer class 1380 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1381 return (jobjectArray)JNIHandles::make_local(env, result); 1382 } 1383 1384 // find inner class info 1385 constantPoolHandle cp(thread, k->constants()); 1386 int length = iter.length(); 1387 1388 // Allocate temp. result array 1389 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1390 objArrayHandle result (THREAD, r); 1391 int members = 0; 1392 1393 for (; !iter.done(); iter.next()) { 1394 int ioff = iter.inner_class_info_index(); 1395 int ooff = iter.outer_class_info_index(); 1396 1397 if (ioff != 0 && ooff != 0) { 1398 // Check to see if the name matches the class we're looking for 1399 // before attempting to find the class. 1400 if (cp->klass_name_at_matches(k, ooff)) { 1401 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1402 if (outer_klass == k()) { 1403 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1404 instanceKlassHandle inner_klass (THREAD, ik); 1405 1406 // Throws an exception if outer klass has not declared k as 1407 // an inner klass 1408 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1409 1410 result->obj_at_put(members, inner_klass->java_mirror()); 1411 members++; 1412 } 1413 } 1414 } 1415 } 1416 1417 if (members != length) { 1418 // Return array of right length 1419 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1420 for(int i = 0; i < members; i++) { 1421 res->obj_at_put(i, result->obj_at(i)); 1422 } 1423 return (jobjectArray)JNIHandles::make_local(env, res); 1424 } 1425 1426 return (jobjectArray)JNIHandles::make_local(env, result()); 1427JVM_END 1428 1429 1430JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1431{ 1432 // ofClass is a reference to a java_lang_Class object. 1433 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1434 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1435 return NULL; 1436 } 1437 1438 bool inner_is_member = false; 1439 Klass* outer_klass 1440 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1441 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1442 if (outer_klass == NULL) return NULL; // already a top-level class 1443 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1444 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1445} 1446JVM_END 1447 1448// should be in InstanceKlass.cpp, but is here for historical reasons 1449Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle k, 1450 bool* inner_is_member, 1451 TRAPS) { 1452 Thread* thread = THREAD; 1453 InnerClassesIterator iter(k); 1454 if (iter.length() == 0) { 1455 // No inner class info => no declaring class 1456 return NULL; 1457 } 1458 1459 constantPoolHandle i_cp(thread, k->constants()); 1460 1461 bool found = false; 1462 Klass* ok; 1463 instanceKlassHandle outer_klass; 1464 *inner_is_member = false; 1465 1466 // Find inner_klass attribute 1467 for (; !iter.done() && !found; iter.next()) { 1468 int ioff = iter.inner_class_info_index(); 1469 int ooff = iter.outer_class_info_index(); 1470 int noff = iter.inner_name_index(); 1471 if (ioff != 0) { 1472 // Check to see if the name matches the class we're looking for 1473 // before attempting to find the class. 1474 if (i_cp->klass_name_at_matches(k, ioff)) { 1475 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_NULL); 1476 found = (k() == inner_klass); 1477 if (found && ooff != 0) { 1478 ok = i_cp->klass_at(ooff, CHECK_NULL); 1479 outer_klass = instanceKlassHandle(thread, ok); 1480 *inner_is_member = true; 1481 } 1482 } 1483 } 1484 } 1485 1486 if (found && outer_klass.is_null()) { 1487 // It may be anonymous; try for that. 1488 int encl_method_class_idx = k->enclosing_method_class_index(); 1489 if (encl_method_class_idx != 0) { 1490 ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL); 1491 outer_klass = instanceKlassHandle(thread, ok); 1492 *inner_is_member = false; 1493 } 1494 } 1495 1496 // If no inner class attribute found for this class. 1497 if (outer_klass.is_null()) return NULL; 1498 1499 // Throws an exception if outer klass has not declared k as an inner klass 1500 // We need evidence that each klass knows about the other, or else 1501 // the system could allow a spoof of an inner class to gain access rights. 1502 Reflection::check_for_inner_class(outer_klass, k, *inner_is_member, CHECK_NULL); 1503 return outer_klass(); 1504} 1505 1506JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1507 assert (cls != NULL, "illegal class"); 1508 JVMWrapper("JVM_GetClassSignature"); 1509 JvmtiVMObjectAllocEventCollector oam; 1510 ResourceMark rm(THREAD); 1511 // Return null for arrays and primatives 1512 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1513 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1514 if (k->oop_is_instance()) { 1515 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1516 if (sym == NULL) return NULL; 1517 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1518 return (jstring) JNIHandles::make_local(env, str()); 1519 } 1520 } 1521 return NULL; 1522JVM_END 1523 1524 1525JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1526 assert (cls != NULL, "illegal class"); 1527 JVMWrapper("JVM_GetClassAnnotations"); 1528 1529 // Return null for arrays and primitives 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 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1534 return (jbyteArray) JNIHandles::make_local(env, a); 1535 } 1536 } 1537 return NULL; 1538JVM_END 1539 1540 1541static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1542 // some of this code was adapted from from jni_FromReflectedField 1543 1544 oop reflected = JNIHandles::resolve_non_null(field); 1545 oop mirror = java_lang_reflect_Field::clazz(reflected); 1546 Klass* k = java_lang_Class::as_Klass(mirror); 1547 int slot = java_lang_reflect_Field::slot(reflected); 1548 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1549 1550 KlassHandle kh(THREAD, k); 1551 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot); 1552 1553 if (modifiers & JVM_ACC_STATIC) { 1554 // for static fields we only look in the current class 1555 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) { 1556 assert(false, "cannot find static field"); 1557 return false; 1558 } 1559 } else { 1560 // for instance fields we start with the current class and work 1561 // our way up through the superclass chain 1562 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) { 1563 assert(false, "cannot find instance field"); 1564 return false; 1565 } 1566 } 1567 return true; 1568} 1569 1570static Method* jvm_get_method_common(jobject method) { 1571 // some of this code was adapted from from jni_FromReflectedMethod 1572 1573 oop reflected = JNIHandles::resolve_non_null(method); 1574 oop mirror = NULL; 1575 int slot = 0; 1576 1577 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1578 mirror = java_lang_reflect_Constructor::clazz(reflected); 1579 slot = java_lang_reflect_Constructor::slot(reflected); 1580 } else { 1581 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1582 "wrong type"); 1583 mirror = java_lang_reflect_Method::clazz(reflected); 1584 slot = java_lang_reflect_Method::slot(reflected); 1585 } 1586 Klass* k = java_lang_Class::as_Klass(mirror); 1587 1588 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1589 assert(m != NULL, "cannot find method"); 1590 return m; // caller has to deal with NULL in product mode 1591} 1592 1593/* Type use annotations support (JDK 1.8) */ 1594 1595JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1596 assert (cls != NULL, "illegal class"); 1597 JVMWrapper("JVM_GetClassTypeAnnotations"); 1598 ResourceMark rm(THREAD); 1599 // Return null for arrays and primitives 1600 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1601 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1602 if (k->oop_is_instance()) { 1603 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1604 if (type_annotations != NULL) { 1605 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1606 return (jbyteArray) JNIHandles::make_local(env, a); 1607 } 1608 } 1609 } 1610 return NULL; 1611JVM_END 1612 1613JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1614 assert (method != NULL, "illegal method"); 1615 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1616 1617 // method is a handle to a java.lang.reflect.Method object 1618 Method* m = jvm_get_method_common(method); 1619 if (m == NULL) { 1620 return NULL; 1621 } 1622 1623 AnnotationArray* type_annotations = m->type_annotations(); 1624 if (type_annotations != NULL) { 1625 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1626 return (jbyteArray) JNIHandles::make_local(env, a); 1627 } 1628 1629 return NULL; 1630JVM_END 1631 1632JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1633 assert (field != NULL, "illegal field"); 1634 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1635 1636 fieldDescriptor fd; 1637 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1638 if (!gotFd) { 1639 return NULL; 1640 } 1641 1642 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1643JVM_END 1644 1645static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { 1646 if (!cp->is_within_bounds(index)) { 1647 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1648 } 1649} 1650 1651JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1652{ 1653 JVMWrapper("JVM_GetMethodParameters"); 1654 // method is a handle to a java.lang.reflect.Method object 1655 Method* method_ptr = jvm_get_method_common(method); 1656 methodHandle mh (THREAD, method_ptr); 1657 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1658 const int num_params = mh->method_parameters_length(); 1659 1660 if (0 != num_params) { 1661 // make sure all the symbols are properly formatted 1662 for (int i = 0; i < num_params; i++) { 1663 MethodParametersElement* params = mh->method_parameters_start(); 1664 int index = params[i].name_cp_index; 1665 bounds_check(mh->constants(), index, CHECK_NULL); 1666 1667 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1668 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1669 "Wrong type at constant pool index"); 1670 } 1671 1672 } 1673 1674 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1675 objArrayHandle result (THREAD, result_oop); 1676 1677 for (int i = 0; i < num_params; i++) { 1678 MethodParametersElement* params = mh->method_parameters_start(); 1679 // For a 0 index, give a NULL symbol 1680 Symbol* sym = 0 != params[i].name_cp_index ? 1681 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1682 int flags = params[i].flags; 1683 oop param = Reflection::new_parameter(reflected_method, i, sym, 1684 flags, CHECK_NULL); 1685 result->obj_at_put(i, param); 1686 } 1687 return (jobjectArray)JNIHandles::make_local(env, result()); 1688 } else { 1689 return (jobjectArray)NULL; 1690 } 1691} 1692JVM_END 1693 1694// New (JDK 1.4) reflection implementation ///////////////////////////////////// 1695 1696JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1697{ 1698 JVMWrapper("JVM_GetClassDeclaredFields"); 1699 JvmtiVMObjectAllocEventCollector oam; 1700 1701 // Exclude primitive types and array types 1702 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1703 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 1704 // Return empty array 1705 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1706 return (jobjectArray) JNIHandles::make_local(env, res); 1707 } 1708 1709 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1710 constantPoolHandle cp(THREAD, k->constants()); 1711 1712 // Ensure class is linked 1713 k->link_class(CHECK_NULL); 1714 1715 // 4496456 We need to filter out java.lang.Throwable.backtrace 1716 bool skip_backtrace = false; 1717 1718 // Allocate result 1719 int num_fields; 1720 1721 if (publicOnly) { 1722 num_fields = 0; 1723 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) { 1724 if (fs.access_flags().is_public()) ++num_fields; 1725 } 1726 } else { 1727 num_fields = k->java_fields_count(); 1728 1729 if (k() == SystemDictionary::Throwable_klass()) { 1730 num_fields--; 1731 skip_backtrace = true; 1732 } 1733 } 1734 1735 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1736 objArrayHandle result (THREAD, r); 1737 1738 int out_idx = 0; 1739 fieldDescriptor fd; 1740 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1741 if (skip_backtrace) { 1742 // 4496456 skip java.lang.Throwable.backtrace 1743 int offset = fs.offset(); 1744 if (offset == java_lang_Throwable::get_backtrace_offset()) continue; 1745 } 1746 1747 if (!publicOnly || fs.access_flags().is_public()) { 1748 fd.reinitialize(k(), fs.index()); 1749 oop field = Reflection::new_field(&fd, CHECK_NULL); 1750 result->obj_at_put(out_idx, field); 1751 ++out_idx; 1752 } 1753 } 1754 assert(out_idx == num_fields, "just checking"); 1755 return (jobjectArray) JNIHandles::make_local(env, result()); 1756} 1757JVM_END 1758 1759static bool select_method(methodHandle method, bool want_constructor) { 1760 if (want_constructor) { 1761 return (method->is_initializer() && !method->is_static()); 1762 } else { 1763 return (!method->is_initializer() && !method->is_overpass()); 1764 } 1765} 1766 1767static jobjectArray get_class_declared_methods_helper( 1768 JNIEnv *env, 1769 jclass ofClass, jboolean publicOnly, 1770 bool want_constructor, 1771 Klass* klass, TRAPS) { 1772 1773 JvmtiVMObjectAllocEventCollector oam; 1774 1775 // Exclude primitive types and array types 1776 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1777 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 1778 // Return empty array 1779 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1780 return (jobjectArray) JNIHandles::make_local(env, res); 1781 } 1782 1783 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1784 1785 // Ensure class is linked 1786 k->link_class(CHECK_NULL); 1787 1788 Array<Method*>* methods = k->methods(); 1789 int methods_length = methods->length(); 1790 1791 // Save original method_idnum in case of redefinition, which can change 1792 // the idnum of obsolete methods. The new method will have the same idnum 1793 // but if we refresh the methods array, the counts will be wrong. 1794 ResourceMark rm(THREAD); 1795 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1796 int num_methods = 0; 1797 1798 for (int i = 0; i < methods_length; i++) { 1799 methodHandle method(THREAD, methods->at(i)); 1800 if (select_method(method, want_constructor)) { 1801 if (!publicOnly || method->is_public()) { 1802 idnums->push(method->method_idnum()); 1803 ++num_methods; 1804 } 1805 } 1806 } 1807 1808 // Allocate result 1809 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1810 objArrayHandle result (THREAD, r); 1811 1812 // Now just put the methods that we selected above, but go by their idnum 1813 // in case of redefinition. The methods can be redefined at any safepoint, 1814 // so above when allocating the oop array and below when creating reflect 1815 // objects. 1816 for (int i = 0; i < num_methods; i++) { 1817 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1818 if (method.is_null()) { 1819 // Method may have been deleted and seems this API can handle null 1820 // Otherwise should probably put a method that throws NSME 1821 result->obj_at_put(i, NULL); 1822 } else { 1823 oop m; 1824 if (want_constructor) { 1825 m = Reflection::new_constructor(method, CHECK_NULL); 1826 } else { 1827 m = Reflection::new_method(method, false, CHECK_NULL); 1828 } 1829 result->obj_at_put(i, m); 1830 } 1831 } 1832 1833 return (jobjectArray) JNIHandles::make_local(env, result()); 1834} 1835 1836JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1837{ 1838 JVMWrapper("JVM_GetClassDeclaredMethods"); 1839 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1840 /*want_constructor*/ false, 1841 SystemDictionary::reflect_Method_klass(), THREAD); 1842} 1843JVM_END 1844 1845JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1846{ 1847 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1848 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1849 /*want_constructor*/ true, 1850 SystemDictionary::reflect_Constructor_klass(), THREAD); 1851} 1852JVM_END 1853 1854JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1855{ 1856 JVMWrapper("JVM_GetClassAccessFlags"); 1857 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1858 // Primitive type 1859 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1860 } 1861 1862 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1863 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1864} 1865JVM_END 1866 1867 1868// Constant pool access ////////////////////////////////////////////////////////// 1869 1870JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1871{ 1872 JVMWrapper("JVM_GetClassConstantPool"); 1873 JvmtiVMObjectAllocEventCollector oam; 1874 1875 // Return null for primitives and arrays 1876 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1877 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1878 if (k->oop_is_instance()) { 1879 instanceKlassHandle k_h(THREAD, k); 1880 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL); 1881 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1882 return JNIHandles::make_local(jcp()); 1883 } 1884 } 1885 return NULL; 1886} 1887JVM_END 1888 1889 1890JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1891{ 1892 JVMWrapper("JVM_ConstantPoolGetSize"); 1893 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1894 return cp->length(); 1895} 1896JVM_END 1897 1898 1899JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1900{ 1901 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1902 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1903 bounds_check(cp, index, CHECK_NULL); 1904 constantTag tag = cp->tag_at(index); 1905 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1906 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1907 } 1908 Klass* k = cp->klass_at(index, CHECK_NULL); 1909 return (jclass) JNIHandles::make_local(k->java_mirror()); 1910} 1911JVM_END 1912 1913JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1914{ 1915 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1916 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1917 bounds_check(cp, index, CHECK_NULL); 1918 constantTag tag = cp->tag_at(index); 1919 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1920 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1921 } 1922 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1923 if (k == NULL) return NULL; 1924 return (jclass) JNIHandles::make_local(k->java_mirror()); 1925} 1926JVM_END 1927 1928static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1929 constantTag tag = cp->tag_at(index); 1930 if (!tag.is_method() && !tag.is_interface_method()) { 1931 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1932 } 1933 int klass_ref = cp->uncached_klass_ref_index_at(index); 1934 Klass* k_o; 1935 if (force_resolution) { 1936 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1937 } else { 1938 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1939 if (k_o == NULL) return NULL; 1940 } 1941 instanceKlassHandle k(THREAD, k_o); 1942 Symbol* name = cp->uncached_name_ref_at(index); 1943 Symbol* sig = cp->uncached_signature_ref_at(index); 1944 methodHandle m (THREAD, k->find_method(name, sig)); 1945 if (m.is_null()) { 1946 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1947 } 1948 oop method; 1949 if (!m->is_initializer() || m->is_static()) { 1950 method = Reflection::new_method(m, true, CHECK_NULL); 1951 } else { 1952 method = Reflection::new_constructor(m, CHECK_NULL); 1953 } 1954 return JNIHandles::make_local(method); 1955} 1956 1957JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1958{ 1959 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1960 JvmtiVMObjectAllocEventCollector oam; 1961 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1962 bounds_check(cp, index, CHECK_NULL); 1963 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1964 return res; 1965} 1966JVM_END 1967 1968JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1969{ 1970 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 1971 JvmtiVMObjectAllocEventCollector oam; 1972 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1973 bounds_check(cp, index, CHECK_NULL); 1974 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 1975 return res; 1976} 1977JVM_END 1978 1979static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1980 constantTag tag = cp->tag_at(index); 1981 if (!tag.is_field()) { 1982 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1983 } 1984 int klass_ref = cp->uncached_klass_ref_index_at(index); 1985 Klass* k_o; 1986 if (force_resolution) { 1987 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1988 } else { 1989 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1990 if (k_o == NULL) return NULL; 1991 } 1992 instanceKlassHandle k(THREAD, k_o); 1993 Symbol* name = cp->uncached_name_ref_at(index); 1994 Symbol* sig = cp->uncached_signature_ref_at(index); 1995 fieldDescriptor fd; 1996 Klass* target_klass = k->find_field(name, sig, &fd); 1997 if (target_klass == NULL) { 1998 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 1999 } 2000 oop field = Reflection::new_field(&fd, CHECK_NULL); 2001 return JNIHandles::make_local(field); 2002} 2003 2004JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2005{ 2006 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2007 JvmtiVMObjectAllocEventCollector oam; 2008 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2009 bounds_check(cp, index, CHECK_NULL); 2010 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2011 return res; 2012} 2013JVM_END 2014 2015JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2016{ 2017 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2018 JvmtiVMObjectAllocEventCollector oam; 2019 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2020 bounds_check(cp, index, CHECK_NULL); 2021 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2022 return res; 2023} 2024JVM_END 2025 2026JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2027{ 2028 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2029 JvmtiVMObjectAllocEventCollector oam; 2030 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2031 bounds_check(cp, index, CHECK_NULL); 2032 constantTag tag = cp->tag_at(index); 2033 if (!tag.is_field_or_method()) { 2034 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2035 } 2036 int klass_ref = cp->uncached_klass_ref_index_at(index); 2037 Symbol* klass_name = cp->klass_name_at(klass_ref); 2038 Symbol* member_name = cp->uncached_name_ref_at(index); 2039 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2040 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2041 objArrayHandle dest(THREAD, dest_o); 2042 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2043 dest->obj_at_put(0, str()); 2044 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2045 dest->obj_at_put(1, str()); 2046 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2047 dest->obj_at_put(2, str()); 2048 return (jobjectArray) JNIHandles::make_local(dest()); 2049} 2050JVM_END 2051 2052JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2053{ 2054 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2055 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2056 bounds_check(cp, index, CHECK_0); 2057 constantTag tag = cp->tag_at(index); 2058 if (!tag.is_int()) { 2059 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2060 } 2061 return cp->int_at(index); 2062} 2063JVM_END 2064 2065JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2066{ 2067 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2068 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2069 bounds_check(cp, index, CHECK_(0L)); 2070 constantTag tag = cp->tag_at(index); 2071 if (!tag.is_long()) { 2072 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2073 } 2074 return cp->long_at(index); 2075} 2076JVM_END 2077 2078JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2079{ 2080 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2081 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2082 bounds_check(cp, index, CHECK_(0.0f)); 2083 constantTag tag = cp->tag_at(index); 2084 if (!tag.is_float()) { 2085 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2086 } 2087 return cp->float_at(index); 2088} 2089JVM_END 2090 2091JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2092{ 2093 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2094 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2095 bounds_check(cp, index, CHECK_(0.0)); 2096 constantTag tag = cp->tag_at(index); 2097 if (!tag.is_double()) { 2098 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2099 } 2100 return cp->double_at(index); 2101} 2102JVM_END 2103 2104JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2105{ 2106 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2107 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2108 bounds_check(cp, index, CHECK_NULL); 2109 constantTag tag = cp->tag_at(index); 2110 if (!tag.is_string()) { 2111 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2112 } 2113 oop str = cp->string_at(index, CHECK_NULL); 2114 return (jstring) JNIHandles::make_local(str); 2115} 2116JVM_END 2117 2118JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2119{ 2120 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2121 JvmtiVMObjectAllocEventCollector oam; 2122 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2123 bounds_check(cp, index, CHECK_NULL); 2124 constantTag tag = cp->tag_at(index); 2125 if (!tag.is_symbol()) { 2126 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2127 } 2128 Symbol* sym = cp->symbol_at(index); 2129 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2130 return (jstring) JNIHandles::make_local(str()); 2131} 2132JVM_END 2133 2134 2135// Assertion support. ////////////////////////////////////////////////////////// 2136 2137JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2138 JVMWrapper("JVM_DesiredAssertionStatus"); 2139 assert(cls != NULL, "bad class"); 2140 2141 oop r = JNIHandles::resolve(cls); 2142 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2143 if (java_lang_Class::is_primitive(r)) return false; 2144 2145 Klass* k = java_lang_Class::as_Klass(r); 2146 assert(k->oop_is_instance(), "must be an instance klass"); 2147 if (! k->oop_is_instance()) return false; 2148 2149 ResourceMark rm(THREAD); 2150 const char* name = k->name()->as_C_string(); 2151 bool system_class = k->class_loader() == NULL; 2152 return JavaAssertions::enabled(name, system_class); 2153 2154JVM_END 2155 2156 2157// Return a new AssertionStatusDirectives object with the fields filled in with 2158// command-line assertion arguments (i.e., -ea, -da). 2159JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2160 JVMWrapper("JVM_AssertionStatusDirectives"); 2161 JvmtiVMObjectAllocEventCollector oam; 2162 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2163 return JNIHandles::make_local(env, asd); 2164JVM_END 2165 2166// Verification //////////////////////////////////////////////////////////////////////////////// 2167 2168// Reflection for the verifier ///////////////////////////////////////////////////////////////// 2169 2170// RedefineClasses support: bug 6214132 caused verification to fail. 2171// All functions from this section should call the jvmtiThreadSate function: 2172// Klass* class_to_verify_considering_redefinition(Klass* klass). 2173// The function returns a Klass* of the _scratch_class if the verifier 2174// was invoked in the middle of the class redefinition. 2175// Otherwise it returns its argument value which is the _the_class Klass*. 2176// Please, refer to the description in the jvmtiThreadSate.hpp. 2177 2178JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2179 JVMWrapper("JVM_GetClassNameUTF"); 2180 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2181 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2182 return k->name()->as_utf8(); 2183JVM_END 2184 2185 2186JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2187 JVMWrapper("JVM_GetClassCPTypes"); 2188 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2189 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2190 // types will have length zero if this is not an InstanceKlass 2191 // (length is determined by call to JVM_GetClassCPEntriesCount) 2192 if (k->oop_is_instance()) { 2193 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2194 for (int index = cp->length() - 1; index >= 0; index--) { 2195 constantTag tag = cp->tag_at(index); 2196 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2197 } 2198 } 2199JVM_END 2200 2201 2202JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2203 JVMWrapper("JVM_GetClassCPEntriesCount"); 2204 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2205 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2206 if (!k->oop_is_instance()) 2207 return 0; 2208 return InstanceKlass::cast(k)->constants()->length(); 2209JVM_END 2210 2211 2212JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2213 JVMWrapper("JVM_GetClassFieldsCount"); 2214 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2215 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2216 if (!k->oop_is_instance()) 2217 return 0; 2218 return InstanceKlass::cast(k)->java_fields_count(); 2219JVM_END 2220 2221 2222JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2223 JVMWrapper("JVM_GetClassMethodsCount"); 2224 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2225 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2226 if (!k->oop_is_instance()) 2227 return 0; 2228 return InstanceKlass::cast(k)->methods()->length(); 2229JVM_END 2230 2231 2232// The following methods, used for the verifier, are never called with 2233// array klasses, so a direct cast to InstanceKlass is safe. 2234// Typically, these methods are called in a loop with bounds determined 2235// by the results of JVM_GetClass{Fields,Methods}Count, which return 2236// zero for arrays. 2237JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2238 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2239 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2240 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2241 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2242 int length = method->checked_exceptions_length(); 2243 if (length > 0) { 2244 CheckedExceptionElement* table= method->checked_exceptions_start(); 2245 for (int i = 0; i < length; i++) { 2246 exceptions[i] = table[i].class_cp_index; 2247 } 2248 } 2249JVM_END 2250 2251 2252JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2253 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2254 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2255 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2256 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2257 return method->checked_exceptions_length(); 2258JVM_END 2259 2260 2261JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2262 JVMWrapper("JVM_GetMethodIxByteCode"); 2263 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2264 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2265 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2266 memcpy(code, method->code_base(), method->code_size()); 2267JVM_END 2268 2269 2270JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2271 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2272 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2273 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2274 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2275 return method->code_size(); 2276JVM_END 2277 2278 2279JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2280 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2281 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2282 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2283 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2284 ExceptionTable extable(method); 2285 entry->start_pc = extable.start_pc(entry_index); 2286 entry->end_pc = extable.end_pc(entry_index); 2287 entry->handler_pc = extable.handler_pc(entry_index); 2288 entry->catchType = extable.catch_type_index(entry_index); 2289JVM_END 2290 2291 2292JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2293 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2294 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2295 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2296 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2297 return method->exception_table_length(); 2298JVM_END 2299 2300 2301JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2302 JVMWrapper("JVM_GetMethodIxModifiers"); 2303 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2304 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2305 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2306 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2307JVM_END 2308 2309 2310JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2311 JVMWrapper("JVM_GetFieldIxModifiers"); 2312 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2313 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2314 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2315JVM_END 2316 2317 2318JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2319 JVMWrapper("JVM_GetMethodIxLocalsCount"); 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->max_locals(); 2324JVM_END 2325 2326 2327JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2328 JVMWrapper("JVM_GetMethodIxArgsSize"); 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->size_of_parameters(); 2333JVM_END 2334 2335 2336JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2337 JVMWrapper("JVM_GetMethodIxMaxStack"); 2338 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2339 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2340 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2341 return method->verifier_max_stack(); 2342JVM_END 2343 2344 2345JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2346 JVMWrapper("JVM_IsConstructorIx"); 2347 ResourceMark rm(THREAD); 2348 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2349 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2350 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2351 return method->name() == vmSymbols::object_initializer_name(); 2352JVM_END 2353 2354 2355JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2356 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2357 ResourceMark rm(THREAD); 2358 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2359 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2360 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2361 return method->is_overpass(); 2362JVM_END 2363 2364JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2365 JVMWrapper("JVM_GetMethodIxIxUTF"); 2366 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2367 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2368 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2369 return method->name()->as_utf8(); 2370JVM_END 2371 2372 2373JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2374 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2375 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2376 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2377 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2378 return method->signature()->as_utf8(); 2379JVM_END 2380 2381/** 2382 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2383 * read entries in the constant pool. Since the old verifier always 2384 * works on a copy of the code, it will not see any rewriting that 2385 * may possibly occur in the middle of verification. So it is important 2386 * that nothing it calls tries to use the cpCache instead of the raw 2387 * constant pool, so we must use cp->uncached_x methods when appropriate. 2388 */ 2389JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2390 JVMWrapper("JVM_GetCPFieldNameUTF"); 2391 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2392 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2393 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2394 switch (cp->tag_at(cp_index).value()) { 2395 case JVM_CONSTANT_Fieldref: 2396 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2397 default: 2398 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2399 } 2400 ShouldNotReachHere(); 2401 return NULL; 2402JVM_END 2403 2404 2405JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2406 JVMWrapper("JVM_GetCPMethodNameUTF"); 2407 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2408 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2409 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2410 switch (cp->tag_at(cp_index).value()) { 2411 case JVM_CONSTANT_InterfaceMethodref: 2412 case JVM_CONSTANT_Methodref: 2413 case JVM_CONSTANT_NameAndType: // for invokedynamic 2414 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2415 default: 2416 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2417 } 2418 ShouldNotReachHere(); 2419 return NULL; 2420JVM_END 2421 2422 2423JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2424 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2425 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2426 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2427 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2428 switch (cp->tag_at(cp_index).value()) { 2429 case JVM_CONSTANT_InterfaceMethodref: 2430 case JVM_CONSTANT_Methodref: 2431 case JVM_CONSTANT_NameAndType: // for invokedynamic 2432 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2433 default: 2434 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2435 } 2436 ShouldNotReachHere(); 2437 return NULL; 2438JVM_END 2439 2440 2441JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2442 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2443 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2444 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2445 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2446 switch (cp->tag_at(cp_index).value()) { 2447 case JVM_CONSTANT_Fieldref: 2448 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2449 default: 2450 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2451 } 2452 ShouldNotReachHere(); 2453 return NULL; 2454JVM_END 2455 2456 2457JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2458 JVMWrapper("JVM_GetCPClassNameUTF"); 2459 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2460 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2461 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2462 Symbol* classname = cp->klass_name_at(cp_index); 2463 return classname->as_utf8(); 2464JVM_END 2465 2466 2467JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2468 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 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 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2475 Symbol* classname = cp->klass_name_at(class_index); 2476 return classname->as_utf8(); 2477 } 2478 default: 2479 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2480 } 2481 ShouldNotReachHere(); 2482 return NULL; 2483JVM_END 2484 2485 2486JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2487 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2488 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2489 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2490 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2491 switch (cp->tag_at(cp_index).value()) { 2492 case JVM_CONSTANT_Methodref: 2493 case JVM_CONSTANT_InterfaceMethodref: { 2494 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2495 Symbol* classname = cp->klass_name_at(class_index); 2496 return classname->as_utf8(); 2497 } 2498 default: 2499 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2500 } 2501 ShouldNotReachHere(); 2502 return NULL; 2503JVM_END 2504 2505 2506JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2507 JVMWrapper("JVM_GetCPFieldModifiers"); 2508 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2509 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2510 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2511 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2512 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2513 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2514 switch (cp->tag_at(cp_index).value()) { 2515 case JVM_CONSTANT_Fieldref: { 2516 Symbol* name = cp->uncached_name_ref_at(cp_index); 2517 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2518 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) { 2519 if (fs.name() == name && fs.signature() == signature) { 2520 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2521 } 2522 } 2523 return -1; 2524 } 2525 default: 2526 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2527 } 2528 ShouldNotReachHere(); 2529 return 0; 2530JVM_END 2531 2532 2533JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2534 JVMWrapper("JVM_GetCPMethodModifiers"); 2535 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2536 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2537 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2538 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2539 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2540 switch (cp->tag_at(cp_index).value()) { 2541 case JVM_CONSTANT_Methodref: 2542 case JVM_CONSTANT_InterfaceMethodref: { 2543 Symbol* name = cp->uncached_name_ref_at(cp_index); 2544 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2545 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2546 int methods_count = methods->length(); 2547 for (int i = 0; i < methods_count; i++) { 2548 Method* method = methods->at(i); 2549 if (method->name() == name && method->signature() == signature) { 2550 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2551 } 2552 } 2553 return -1; 2554 } 2555 default: 2556 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2557 } 2558 ShouldNotReachHere(); 2559 return 0; 2560JVM_END 2561 2562 2563// Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2564 2565JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2566 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2567JVM_END 2568 2569 2570JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2571 JVMWrapper("JVM_IsSameClassPackage"); 2572 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2573 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2574 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2575 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2576 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2577JVM_END 2578 2579// Printing support ////////////////////////////////////////////////// 2580extern "C" { 2581 2582ATTRIBUTE_PRINTF(3, 0) 2583int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2584 // see bug 4399518, 4417214 2585 if ((intptr_t)count <= 0) return -1; 2586 return vsnprintf(str, count, fmt, args); 2587} 2588 2589ATTRIBUTE_PRINTF(3, 0) 2590int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2591 va_list args; 2592 int len; 2593 va_start(args, fmt); 2594 len = jio_vsnprintf(str, count, fmt, args); 2595 va_end(args); 2596 return len; 2597} 2598 2599ATTRIBUTE_PRINTF(2,3) 2600int jio_fprintf(FILE* f, const char *fmt, ...) { 2601 int len; 2602 va_list args; 2603 va_start(args, fmt); 2604 len = jio_vfprintf(f, fmt, args); 2605 va_end(args); 2606 return len; 2607} 2608 2609ATTRIBUTE_PRINTF(2, 0) 2610int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2611 if (Arguments::vfprintf_hook() != NULL) { 2612 return Arguments::vfprintf_hook()(f, fmt, args); 2613 } else { 2614 return vfprintf(f, fmt, args); 2615 } 2616} 2617 2618ATTRIBUTE_PRINTF(1, 2) 2619JNIEXPORT int jio_printf(const char *fmt, ...) { 2620 int len; 2621 va_list args; 2622 va_start(args, fmt); 2623 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2624 va_end(args); 2625 return len; 2626} 2627 2628 2629// HotSpot specific jio method 2630void jio_print(const char* s) { 2631 // Try to make this function as atomic as possible. 2632 if (Arguments::vfprintf_hook() != NULL) { 2633 jio_fprintf(defaultStream::output_stream(), "%s", s); 2634 } else { 2635 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2636 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2637 } 2638} 2639 2640} // Extern C 2641 2642// java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2643 2644// In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 2645// to prevent the target thread from exiting after we have a pointer to the C++ Thread or 2646// OSThread objects. The exception to this rule is when the target object is the thread 2647// doing the operation, in which case we know that the thread won't exit until the 2648// operation is done (all exits being voluntary). There are a few cases where it is 2649// rather silly to do operations on yourself, like resuming yourself or asking whether 2650// you are alive. While these can still happen, they are not subject to deadlocks if 2651// the lock is held while the operation occurs (this is not the case for suspend, for 2652// instance), and are very unlikely. Because IsAlive needs to be fast and its 2653// implementation is local to this file, we always lock Threads_lock for that one. 2654 2655static void thread_entry(JavaThread* thread, TRAPS) { 2656 HandleMark hm(THREAD); 2657 Handle obj(THREAD, thread->threadObj()); 2658 JavaValue result(T_VOID); 2659 JavaCalls::call_virtual(&result, 2660 obj, 2661 KlassHandle(THREAD, SystemDictionary::Thread_klass()), 2662 vmSymbols::run_method_name(), 2663 vmSymbols::void_method_signature(), 2664 THREAD); 2665} 2666 2667 2668JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2669 JVMWrapper("JVM_StartThread"); 2670 JavaThread *native_thread = NULL; 2671 2672 // We cannot hold the Threads_lock when we throw an exception, 2673 // due to rank ordering issues. Example: we might need to grab the 2674 // Heap_lock while we construct the exception. 2675 bool throw_illegal_thread_state = false; 2676 2677 // We must release the Threads_lock before we can post a jvmti event 2678 // in Thread::start. 2679 { 2680 // Ensure that the C++ Thread and OSThread structures aren't freed before 2681 // we operate. 2682 MutexLocker mu(Threads_lock); 2683 2684 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2685 // re-starting an already started thread, so we should usually find 2686 // that the JavaThread is null. However for a JNI attached thread 2687 // there is a small window between the Thread object being created 2688 // (with its JavaThread set) and the update to its threadStatus, so we 2689 // have to check for this 2690 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2691 throw_illegal_thread_state = true; 2692 } else { 2693 // We could also check the stillborn flag to see if this thread was already stopped, but 2694 // for historical reasons we let the thread detect that itself when it starts running 2695 2696 jlong size = 2697 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2698 // Allocate the C++ Thread structure and create the native thread. The 2699 // stack size retrieved from java is signed, but the constructor takes 2700 // size_t (an unsigned type), so avoid passing negative values which would 2701 // result in really large stacks. 2702 size_t sz = size > 0 ? (size_t) size : 0; 2703 native_thread = new JavaThread(&thread_entry, sz); 2704 2705 // At this point it may be possible that no osthread was created for the 2706 // JavaThread due to lack of memory. Check for this situation and throw 2707 // an exception if necessary. Eventually we may want to change this so 2708 // that we only grab the lock if the thread was created successfully - 2709 // then we can also do this check and throw the exception in the 2710 // JavaThread constructor. 2711 if (native_thread->osthread() != NULL) { 2712 // Note: the current thread is not being used within "prepare". 2713 native_thread->prepare(jthread); 2714 } 2715 } 2716 } 2717 2718 if (throw_illegal_thread_state) { 2719 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2720 } 2721 2722 assert(native_thread != NULL, "Starting null thread?"); 2723 2724 if (native_thread->osthread() == NULL) { 2725 // No one should hold a reference to the 'native_thread'. 2726 delete native_thread; 2727 if (JvmtiExport::should_post_resource_exhausted()) { 2728 JvmtiExport::post_resource_exhausted( 2729 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2730 os::native_thread_creation_failed_msg()); 2731 } 2732 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2733 os::native_thread_creation_failed_msg()); 2734 } 2735 2736 Thread::start(native_thread); 2737 2738JVM_END 2739 2740// JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2741// before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2742// but is thought to be reliable and simple. In the case, where the receiver is the 2743// same thread as the sender, no safepoint is needed. 2744JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2745 JVMWrapper("JVM_StopThread"); 2746 2747 oop java_throwable = JNIHandles::resolve(throwable); 2748 if (java_throwable == NULL) { 2749 THROW(vmSymbols::java_lang_NullPointerException()); 2750 } 2751 oop java_thread = JNIHandles::resolve_non_null(jthread); 2752 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2753 Events::log_exception(JavaThread::current(), 2754 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2755 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2756 // First check if thread is alive 2757 if (receiver != NULL) { 2758 // Check if exception is getting thrown at self (use oop equality, since the 2759 // target object might exit) 2760 if (java_thread == thread->threadObj()) { 2761 THROW_OOP(java_throwable); 2762 } else { 2763 // Enques a VM_Operation to stop all threads and then deliver the exception... 2764 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 2765 } 2766 } 2767 else { 2768 // Either: 2769 // - target thread has not been started before being stopped, or 2770 // - target thread already terminated 2771 // We could read the threadStatus to determine which case it is 2772 // but that is overkill as it doesn't matter. We must set the 2773 // stillborn flag for the first case, and if the thread has already 2774 // exited setting this flag has no affect 2775 java_lang_Thread::set_stillborn(java_thread); 2776 } 2777JVM_END 2778 2779 2780JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2781 JVMWrapper("JVM_IsThreadAlive"); 2782 2783 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2784 return java_lang_Thread::is_alive(thread_oop); 2785JVM_END 2786 2787 2788JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2789 JVMWrapper("JVM_SuspendThread"); 2790 oop java_thread = JNIHandles::resolve_non_null(jthread); 2791 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2792 2793 if (receiver != NULL) { 2794 // thread has run and has not exited (still on threads list) 2795 2796 { 2797 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2798 if (receiver->is_external_suspend()) { 2799 // Don't allow nested external suspend requests. We can't return 2800 // an error from this interface so just ignore the problem. 2801 return; 2802 } 2803 if (receiver->is_exiting()) { // thread is in the process of exiting 2804 return; 2805 } 2806 receiver->set_external_suspend(); 2807 } 2808 2809 // java_suspend() will catch threads in the process of exiting 2810 // and will ignore them. 2811 receiver->java_suspend(); 2812 2813 // It would be nice to have the following assertion in all the 2814 // time, but it is possible for a racing resume request to have 2815 // resumed this thread right after we suspended it. Temporarily 2816 // enable this assertion if you are chasing a different kind of 2817 // bug. 2818 // 2819 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2820 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2821 } 2822JVM_END 2823 2824 2825JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2826 JVMWrapper("JVM_ResumeThread"); 2827 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 2828 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2829 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2830 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2831 // looks at it. 2832 MutexLocker ml(Threads_lock); 2833 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2834 if (thr != NULL) { 2835 // the thread has run and is not in the process of exiting 2836 thr->java_resume(); 2837 } 2838JVM_END 2839 2840 2841JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2842 JVMWrapper("JVM_SetThreadPriority"); 2843 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2844 MutexLocker ml(Threads_lock); 2845 oop java_thread = JNIHandles::resolve_non_null(jthread); 2846 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2847 JavaThread* thr = java_lang_Thread::thread(java_thread); 2848 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 2849 Thread::set_priority(thr, (ThreadPriority)prio); 2850 } 2851JVM_END 2852 2853 2854JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2855 JVMWrapper("JVM_Yield"); 2856 if (os::dont_yield()) return; 2857 HOTSPOT_THREAD_YIELD(); 2858 2859 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield. 2860 // Critical for similar threading behaviour 2861 if (ConvertYieldToSleep) { 2862 os::sleep(thread, MinSleepInterval, false); 2863 } else { 2864 os::naked_yield(); 2865 } 2866JVM_END 2867 2868 2869JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2870 JVMWrapper("JVM_Sleep"); 2871 2872 if (millis < 0) { 2873 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2874 } 2875 2876 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2877 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2878 } 2879 2880 // Save current thread state and restore it at the end of this block. 2881 // And set new thread state to SLEEPING. 2882 JavaThreadSleepState jtss(thread); 2883 2884 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 2885 2886 EventThreadSleep event; 2887 2888 if (millis == 0) { 2889 // When ConvertSleepToYield is on, this matches the classic VM implementation of 2890 // JVM_Sleep. Critical for similar threading behaviour (Win32) 2891 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep 2892 // for SOLARIS 2893 if (ConvertSleepToYield) { 2894 os::naked_yield(); 2895 } else { 2896 ThreadState old_state = thread->osthread()->get_state(); 2897 thread->osthread()->set_state(SLEEPING); 2898 os::sleep(thread, MinSleepInterval, false); 2899 thread->osthread()->set_state(old_state); 2900 } 2901 } else { 2902 ThreadState old_state = thread->osthread()->get_state(); 2903 thread->osthread()->set_state(SLEEPING); 2904 if (os::sleep(thread, millis, true) == OS_INTRPT) { 2905 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 2906 // us while we were sleeping. We do not overwrite those. 2907 if (!HAS_PENDING_EXCEPTION) { 2908 if (event.should_commit()) { 2909 event.set_time(millis); 2910 event.commit(); 2911 } 2912 HOTSPOT_THREAD_SLEEP_END(1); 2913 2914 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 2915 // to properly restore the thread state. That's likely wrong. 2916 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2917 } 2918 } 2919 thread->osthread()->set_state(old_state); 2920 } 2921 if (event.should_commit()) { 2922 event.set_time(millis); 2923 event.commit(); 2924 } 2925 HOTSPOT_THREAD_SLEEP_END(0); 2926JVM_END 2927 2928JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 2929 JVMWrapper("JVM_CurrentThread"); 2930 oop jthread = thread->threadObj(); 2931 assert (thread != NULL, "no current thread!"); 2932 return JNIHandles::make_local(env, jthread); 2933JVM_END 2934 2935 2936JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 2937 JVMWrapper("JVM_CountStackFrames"); 2938 2939 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2940 oop java_thread = JNIHandles::resolve_non_null(jthread); 2941 bool throw_illegal_thread_state = false; 2942 int count = 0; 2943 2944 { 2945 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 2946 // We need to re-resolve the java_thread, since a GC might have happened during the 2947 // acquire of the lock 2948 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2949 2950 if (thr == NULL) { 2951 // do nothing 2952 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 2953 // Check whether this java thread has been suspended already. If not, throws 2954 // IllegalThreadStateException. We defer to throw that exception until 2955 // Threads_lock is released since loading exception class has to leave VM. 2956 // The correct way to test a thread is actually suspended is 2957 // wait_for_ext_suspend_completion(), but we can't call that while holding 2958 // the Threads_lock. The above tests are sufficient for our purposes 2959 // provided the walkability of the stack is stable - which it isn't 2960 // 100% but close enough for most practical purposes. 2961 throw_illegal_thread_state = true; 2962 } else { 2963 // Count all java activation, i.e., number of vframes 2964 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 2965 // Native frames are not counted 2966 if (!vfst.method()->is_native()) count++; 2967 } 2968 } 2969 } 2970 2971 if (throw_illegal_thread_state) { 2972 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 2973 "this thread is not suspended"); 2974 } 2975 return count; 2976JVM_END 2977 2978// Consider: A better way to implement JVM_Interrupt() is to acquire 2979// Threads_lock to resolve the jthread into a Thread pointer, fetch 2980// Thread->platformevent, Thread->native_thr, Thread->parker, etc., 2981// drop Threads_lock, and the perform the unpark() and thr_kill() operations 2982// outside the critical section. Threads_lock is hot so we want to minimize 2983// the hold-time. A cleaner interface would be to decompose interrupt into 2984// two steps. The 1st phase, performed under Threads_lock, would return 2985// a closure that'd be invoked after Threads_lock was dropped. 2986// This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 2987// admit spurious wakeups. 2988 2989JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 2990 JVMWrapper("JVM_Interrupt"); 2991 2992 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2993 oop java_thread = JNIHandles::resolve_non_null(jthread); 2994 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 2995 // We need to re-resolve the java_thread, since a GC might have happened during the 2996 // acquire of the lock 2997 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2998 if (thr != NULL) { 2999 Thread::interrupt(thr); 3000 } 3001JVM_END 3002 3003 3004JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3005 JVMWrapper("JVM_IsInterrupted"); 3006 3007 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3008 oop java_thread = JNIHandles::resolve_non_null(jthread); 3009 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3010 // We need to re-resolve the java_thread, since a GC might have happened during the 3011 // acquire of the lock 3012 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3013 if (thr == NULL) { 3014 return JNI_FALSE; 3015 } else { 3016 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3017 } 3018JVM_END 3019 3020 3021// Return true iff the current thread has locked the object passed in 3022 3023JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3024 JVMWrapper("JVM_HoldsLock"); 3025 assert(THREAD->is_Java_thread(), "sanity check"); 3026 if (obj == NULL) { 3027 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3028 } 3029 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3030 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3031JVM_END 3032 3033 3034JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3035 JVMWrapper("JVM_DumpAllStacks"); 3036 VM_PrintThreads op; 3037 VMThread::execute(&op); 3038 if (JvmtiExport::should_post_data_dump()) { 3039 JvmtiExport::post_data_dump(); 3040 } 3041JVM_END 3042 3043JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3044 JVMWrapper("JVM_SetNativeThreadName"); 3045 ResourceMark rm(THREAD); 3046 oop java_thread = JNIHandles::resolve_non_null(jthread); 3047 JavaThread* thr = java_lang_Thread::thread(java_thread); 3048 // Thread naming only supported for the current thread, doesn't work for 3049 // target threads. 3050 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3051 // we don't set the name of an attached thread to avoid stepping 3052 // on other programs 3053 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3054 os::set_native_thread_name(thread_name); 3055 } 3056JVM_END 3057 3058// java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3059 3060static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3061 assert(jthread->is_Java_thread(), "must be a Java thread"); 3062 if (jthread->privileged_stack_top() == NULL) return false; 3063 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3064 oop loader = jthread->privileged_stack_top()->class_loader(); 3065 if (loader == NULL) return true; 3066 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3067 if (trusted) return true; 3068 } 3069 return false; 3070} 3071 3072JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3073 JVMWrapper("JVM_CurrentLoadedClass"); 3074 ResourceMark rm(THREAD); 3075 3076 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3077 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3078 bool trusted = is_trusted_frame(thread, &vfst); 3079 if (trusted) return NULL; 3080 3081 Method* m = vfst.method(); 3082 if (!m->is_native()) { 3083 InstanceKlass* holder = m->method_holder(); 3084 oop loader = holder->class_loader(); 3085 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3086 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3087 } 3088 } 3089 } 3090 return NULL; 3091JVM_END 3092 3093 3094JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3095 JVMWrapper("JVM_CurrentClassLoader"); 3096 ResourceMark rm(THREAD); 3097 3098 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3099 3100 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3101 bool trusted = is_trusted_frame(thread, &vfst); 3102 if (trusted) return NULL; 3103 3104 Method* m = vfst.method(); 3105 if (!m->is_native()) { 3106 InstanceKlass* holder = m->method_holder(); 3107 assert(holder->is_klass(), "just checking"); 3108 oop loader = holder->class_loader(); 3109 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3110 return JNIHandles::make_local(env, loader); 3111 } 3112 } 3113 } 3114 return NULL; 3115JVM_END 3116 3117 3118JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3119 JVMWrapper("JVM_GetClassContext"); 3120 ResourceMark rm(THREAD); 3121 JvmtiVMObjectAllocEventCollector oam; 3122 vframeStream vfst(thread); 3123 3124 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3125 // This must only be called from SecurityManager.getClassContext 3126 Method* m = vfst.method(); 3127 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3128 m->name() == vmSymbols::getClassContext_name() && 3129 m->signature() == vmSymbols::void_class_array_signature())) { 3130 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3131 } 3132 } 3133 3134 // Collect method holders 3135 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>(); 3136 for (; !vfst.at_end(); vfst.security_next()) { 3137 Method* m = vfst.method(); 3138 // Native frames are not returned 3139 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3140 Klass* holder = m->method_holder(); 3141 assert(holder->is_klass(), "just checking"); 3142 klass_array->append(holder); 3143 } 3144 } 3145 3146 // Create result array of type [Ljava/lang/Class; 3147 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3148 // Fill in mirrors corresponding to method holders 3149 for (int i = 0; i < klass_array->length(); i++) { 3150 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3151 } 3152 3153 return (jobjectArray) JNIHandles::make_local(env, result); 3154JVM_END 3155 3156 3157JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3158 JVMWrapper("JVM_ClassDepth"); 3159 ResourceMark rm(THREAD); 3160 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3161 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3162 3163 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3164 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3165 if (class_name_sym == NULL) { 3166 return -1; 3167 } 3168 3169 int depth = 0; 3170 3171 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3172 if (!vfst.method()->is_native()) { 3173 InstanceKlass* holder = vfst.method()->method_holder(); 3174 assert(holder->is_klass(), "just checking"); 3175 if (holder->name() == class_name_sym) { 3176 return depth; 3177 } 3178 depth++; 3179 } 3180 } 3181 return -1; 3182JVM_END 3183 3184 3185JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3186 JVMWrapper("JVM_ClassLoaderDepth"); 3187 ResourceMark rm(THREAD); 3188 int depth = 0; 3189 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3190 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3191 bool trusted = is_trusted_frame(thread, &vfst); 3192 if (trusted) return -1; 3193 3194 Method* m = vfst.method(); 3195 if (!m->is_native()) { 3196 InstanceKlass* holder = m->method_holder(); 3197 assert(holder->is_klass(), "just checking"); 3198 oop loader = holder->class_loader(); 3199 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3200 return depth; 3201 } 3202 depth++; 3203 } 3204 } 3205 return -1; 3206JVM_END 3207 3208 3209// java.lang.Package //////////////////////////////////////////////////////////////// 3210 3211 3212JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3213 JVMWrapper("JVM_GetSystemPackage"); 3214 ResourceMark rm(THREAD); 3215 JvmtiVMObjectAllocEventCollector oam; 3216 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3217 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3218 return (jstring) JNIHandles::make_local(result); 3219JVM_END 3220 3221 3222JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3223 JVMWrapper("JVM_GetSystemPackages"); 3224 JvmtiVMObjectAllocEventCollector oam; 3225 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3226 return (jobjectArray) JNIHandles::make_local(result); 3227JVM_END 3228 3229 3230// ObjectInputStream /////////////////////////////////////////////////////////////// 3231 3232bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3233 if (current_class == NULL) { 3234 return true; 3235 } 3236 if ((current_class == field_class) || access.is_public()) { 3237 return true; 3238 } 3239 3240 if (access.is_protected()) { 3241 // See if current_class is a subclass of field_class 3242 if (current_class->is_subclass_of(field_class)) { 3243 return true; 3244 } 3245 } 3246 3247 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3248} 3249 3250// Return the first non-null class loader up the execution stack, or null 3251// if only code from the null class loader is on the stack. 3252 3253JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3254 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3255 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3256 oop loader = vfst.method()->method_holder()->class_loader(); 3257 if (loader != NULL) { 3258 return JNIHandles::make_local(env, loader); 3259 } 3260 } 3261 return NULL; 3262JVM_END 3263 3264 3265// Array /////////////////////////////////////////////////////////////////////////////////////////// 3266 3267 3268// resolve array handle and check arguments 3269static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3270 if (arr == NULL) { 3271 THROW_0(vmSymbols::java_lang_NullPointerException()); 3272 } 3273 oop a = JNIHandles::resolve_non_null(arr); 3274 if (!a->is_array()) { 3275 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3276 } else if (type_array_only && !a->is_typeArray()) { 3277 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3278 } 3279 return arrayOop(a); 3280} 3281 3282 3283JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3284 JVMWrapper("JVM_GetArrayLength"); 3285 arrayOop a = check_array(env, arr, false, CHECK_0); 3286 return a->length(); 3287JVM_END 3288 3289 3290JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3291 JVMWrapper("JVM_Array_Get"); 3292 JvmtiVMObjectAllocEventCollector oam; 3293 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3294 jvalue value; 3295 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3296 oop box = Reflection::box(&value, type, CHECK_NULL); 3297 return JNIHandles::make_local(env, box); 3298JVM_END 3299 3300 3301JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3302 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3303 jvalue value; 3304 value.i = 0; // to initialize value before getting used in CHECK 3305 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3306 assert(a->is_typeArray(), "just checking"); 3307 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3308 BasicType wide_type = (BasicType) wCode; 3309 if (type != wide_type) { 3310 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3311 } 3312 return value; 3313JVM_END 3314 3315 3316JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3317 JVMWrapper("JVM_SetArrayElement"); 3318 arrayOop a = check_array(env, arr, false, CHECK); 3319 oop box = JNIHandles::resolve(val); 3320 jvalue value; 3321 value.i = 0; // to initialize value before getting used in CHECK 3322 BasicType value_type; 3323 if (a->is_objArray()) { 3324 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3325 value_type = Reflection::unbox_for_regular_object(box, &value); 3326 } else { 3327 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3328 } 3329 Reflection::array_set(&value, a, index, value_type, CHECK); 3330JVM_END 3331 3332 3333JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3334 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3335 arrayOop a = check_array(env, arr, true, CHECK); 3336 assert(a->is_typeArray(), "just checking"); 3337 BasicType value_type = (BasicType) vCode; 3338 Reflection::array_set(&v, a, index, value_type, CHECK); 3339JVM_END 3340 3341 3342JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3343 JVMWrapper("JVM_NewArray"); 3344 JvmtiVMObjectAllocEventCollector oam; 3345 oop element_mirror = JNIHandles::resolve(eltClass); 3346 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3347 return JNIHandles::make_local(env, result); 3348JVM_END 3349 3350 3351JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3352 JVMWrapper("JVM_NewMultiArray"); 3353 JvmtiVMObjectAllocEventCollector oam; 3354 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3355 oop element_mirror = JNIHandles::resolve(eltClass); 3356 assert(dim_array->is_typeArray(), "just checking"); 3357 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3358 return JNIHandles::make_local(env, result); 3359JVM_END 3360 3361 3362// Library support /////////////////////////////////////////////////////////////////////////// 3363 3364JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3365 //%note jvm_ct 3366 JVMWrapper2("JVM_LoadLibrary (%s)", name); 3367 char ebuf[1024]; 3368 void *load_result; 3369 { 3370 ThreadToNativeFromVM ttnfvm(thread); 3371 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3372 } 3373 if (load_result == NULL) { 3374 char msg[1024]; 3375 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3376 // Since 'ebuf' may contain a string encoded using 3377 // platform encoding scheme, we need to pass 3378 // Exceptions::unsafe_to_utf8 to the new_exception method 3379 // as the last argument. See bug 6367357. 3380 Handle h_exception = 3381 Exceptions::new_exception(thread, 3382 vmSymbols::java_lang_UnsatisfiedLinkError(), 3383 msg, Exceptions::unsafe_to_utf8); 3384 3385 THROW_HANDLE_0(h_exception); 3386 } 3387 return load_result; 3388JVM_END 3389 3390 3391JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3392 JVMWrapper("JVM_UnloadLibrary"); 3393 os::dll_unload(handle); 3394JVM_END 3395 3396 3397JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3398 JVMWrapper2("JVM_FindLibraryEntry (%s)", name); 3399 return os::dll_lookup(handle, name); 3400JVM_END 3401 3402 3403// JNI version /////////////////////////////////////////////////////////////////////////////// 3404 3405JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3406 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version); 3407 return Threads::is_supported_jni_version_including_1_1(version); 3408JVM_END 3409 3410 3411// String support /////////////////////////////////////////////////////////////////////////// 3412 3413JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3414 JVMWrapper("JVM_InternString"); 3415 JvmtiVMObjectAllocEventCollector oam; 3416 if (str == NULL) return NULL; 3417 oop string = JNIHandles::resolve_non_null(str); 3418 oop result = StringTable::intern(string, CHECK_NULL); 3419 return (jstring) JNIHandles::make_local(env, result); 3420JVM_END 3421 3422 3423// Raw monitor support ////////////////////////////////////////////////////////////////////// 3424 3425// The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3426// without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3427// they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3428// that only works with java threads. 3429 3430 3431JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3432 VM_Exit::block_if_vm_exited(); 3433 JVMWrapper("JVM_RawMonitorCreate"); 3434 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3435} 3436 3437 3438JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3439 VM_Exit::block_if_vm_exited(); 3440 JVMWrapper("JVM_RawMonitorDestroy"); 3441 delete ((Mutex*) mon); 3442} 3443 3444 3445JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3446 VM_Exit::block_if_vm_exited(); 3447 JVMWrapper("JVM_RawMonitorEnter"); 3448 ((Mutex*) mon)->jvm_raw_lock(); 3449 return 0; 3450} 3451 3452 3453JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3454 VM_Exit::block_if_vm_exited(); 3455 JVMWrapper("JVM_RawMonitorExit"); 3456 ((Mutex*) mon)->jvm_raw_unlock(); 3457} 3458 3459 3460// Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3461 3462jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3463 Handle loader, Handle protection_domain, 3464 jboolean throwError, TRAPS) { 3465 // Security Note: 3466 // The Java level wrapper will perform the necessary security check allowing 3467 // us to pass the NULL as the initiating class loader. The VM is responsible for 3468 // the checkPackageAccess relative to the initiating class loader via the 3469 // protection_domain. The protection_domain is passed as NULL by the java code 3470 // if there is no security manager in 3-arg Class.forName(). 3471 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3472 3473 KlassHandle klass_handle(THREAD, klass); 3474 // Check if we should initialize the class 3475 if (init && klass_handle->oop_is_instance()) { 3476 klass_handle->initialize(CHECK_NULL); 3477 } 3478 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror()); 3479} 3480 3481 3482// Method /////////////////////////////////////////////////////////////////////////////////////////// 3483 3484JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3485 JVMWrapper("JVM_InvokeMethod"); 3486 Handle method_handle; 3487 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3488 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3489 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3490 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3491 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3492 jobject res = JNIHandles::make_local(env, result); 3493 if (JvmtiExport::should_post_vm_object_alloc()) { 3494 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3495 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3496 if (java_lang_Class::is_primitive(ret_type)) { 3497 // Only for primitive type vm allocates memory for java object. 3498 // See box() method. 3499 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3500 } 3501 } 3502 return res; 3503 } else { 3504 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3505 } 3506JVM_END 3507 3508 3509JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3510 JVMWrapper("JVM_NewInstanceFromConstructor"); 3511 oop constructor_mirror = JNIHandles::resolve(c); 3512 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3513 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3514 jobject res = JNIHandles::make_local(env, result); 3515 if (JvmtiExport::should_post_vm_object_alloc()) { 3516 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3517 } 3518 return res; 3519JVM_END 3520 3521// Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3522 3523JVM_LEAF(jboolean, JVM_SupportsCX8()) 3524 JVMWrapper("JVM_SupportsCX8"); 3525 return VM_Version::supports_cx8(); 3526JVM_END 3527 3528// DTrace /////////////////////////////////////////////////////////////////// 3529 3530JVM_ENTRY(jint, JVM_DTraceGetVersion(JNIEnv* env)) 3531 JVMWrapper("JVM_DTraceGetVersion"); 3532 return (jint)JVM_TRACING_DTRACE_VERSION; 3533JVM_END 3534 3535JVM_ENTRY(jlong,JVM_DTraceActivate( 3536 JNIEnv* env, jint version, jstring module_name, jint providers_count, 3537 JVM_DTraceProvider* providers)) 3538 JVMWrapper("JVM_DTraceActivate"); 3539 return DTraceJSDT::activate( 3540 version, module_name, providers_count, providers, THREAD); 3541JVM_END 3542 3543JVM_ENTRY(jboolean,JVM_DTraceIsProbeEnabled(JNIEnv* env, jmethodID method)) 3544 JVMWrapper("JVM_DTraceIsProbeEnabled"); 3545 return DTraceJSDT::is_probe_enabled(method); 3546JVM_END 3547 3548JVM_ENTRY(void,JVM_DTraceDispose(JNIEnv* env, jlong handle)) 3549 JVMWrapper("JVM_DTraceDispose"); 3550 DTraceJSDT::dispose(handle); 3551JVM_END 3552 3553JVM_ENTRY(jboolean,JVM_DTraceIsSupported(JNIEnv* env)) 3554 JVMWrapper("JVM_DTraceIsSupported"); 3555 return DTraceJSDT::is_supported(); 3556JVM_END 3557 3558// Returns an array of all live Thread objects (VM internal JavaThreads, 3559// jvmti agent threads, and JNI attaching threads are skipped) 3560// See CR 6404306 regarding JNI attaching threads 3561JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3562 ResourceMark rm(THREAD); 3563 ThreadsListEnumerator tle(THREAD, false, false); 3564 JvmtiVMObjectAllocEventCollector oam; 3565 3566 int num_threads = tle.num_threads(); 3567 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3568 objArrayHandle threads_ah(THREAD, r); 3569 3570 for (int i = 0; i < num_threads; i++) { 3571 Handle h = tle.get_threadObj(i); 3572 threads_ah->obj_at_put(i, h()); 3573 } 3574 3575 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3576JVM_END 3577 3578 3579// Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3580// Return StackTraceElement[][], each element is the stack trace of a thread in 3581// the corresponding entry in the given threads array 3582JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3583 JVMWrapper("JVM_DumpThreads"); 3584 JvmtiVMObjectAllocEventCollector oam; 3585 3586 // Check if threads is null 3587 if (threads == NULL) { 3588 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3589 } 3590 3591 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3592 objArrayHandle ah(THREAD, a); 3593 int num_threads = ah->length(); 3594 // check if threads is non-empty array 3595 if (num_threads == 0) { 3596 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3597 } 3598 3599 // check if threads is not an array of objects of Thread class 3600 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3601 if (k != SystemDictionary::Thread_klass()) { 3602 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3603 } 3604 3605 ResourceMark rm(THREAD); 3606 3607 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3608 for (int i = 0; i < num_threads; i++) { 3609 oop thread_obj = ah->obj_at(i); 3610 instanceHandle h(THREAD, (instanceOop) thread_obj); 3611 thread_handle_array->append(h); 3612 } 3613 3614 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3615 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3616 3617JVM_END 3618 3619// JVM monitoring and management support 3620JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3621 return Management::get_jmm_interface(version); 3622JVM_END 3623 3624// com.sun.tools.attach.VirtualMachine agent properties support 3625// 3626// Initialize the agent properties with the properties maintained in the VM 3627JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3628 JVMWrapper("JVM_InitAgentProperties"); 3629 ResourceMark rm; 3630 3631 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3632 3633 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3634 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3635 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3636 return properties; 3637JVM_END 3638 3639JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3640{ 3641 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3642 JvmtiVMObjectAllocEventCollector oam; 3643 3644 if (ofClass == NULL) { 3645 return NULL; 3646 } 3647 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3648 // Special handling for primitive objects 3649 if (java_lang_Class::is_primitive(mirror())) { 3650 return NULL; 3651 } 3652 Klass* k = java_lang_Class::as_Klass(mirror()); 3653 if (!k->oop_is_instance()) { 3654 return NULL; 3655 } 3656 instanceKlassHandle ik_h(THREAD, k); 3657 int encl_method_class_idx = ik_h->enclosing_method_class_index(); 3658 if (encl_method_class_idx == 0) { 3659 return NULL; 3660 } 3661 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3662 objArrayHandle dest(THREAD, dest_o); 3663 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3664 dest->obj_at_put(0, enc_k->java_mirror()); 3665 int encl_method_method_idx = ik_h->enclosing_method_method_index(); 3666 if (encl_method_method_idx != 0) { 3667 Symbol* sym = ik_h->constants()->symbol_at( 3668 extract_low_short_from_int( 3669 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3670 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3671 dest->obj_at_put(1, str()); 3672 sym = ik_h->constants()->symbol_at( 3673 extract_high_short_from_int( 3674 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3675 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3676 dest->obj_at_put(2, str()); 3677 } 3678 return (jobjectArray) JNIHandles::make_local(dest()); 3679} 3680JVM_END 3681 3682JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3683{ 3684 memset(info, 0, info_size); 3685 3686 info->jvm_version = Abstract_VM_Version::jvm_version(); 3687 info->update_version = 0; /* 0 in HotSpot Express VM */ 3688 info->special_update_version = 0; /* 0 in HotSpot Express VM */ 3689 3690 // when we add a new capability in the jvm_version_info struct, we should also 3691 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3692 // counter defined in runtimeService.cpp. 3693 info->is_attachable = AttachListener::is_attach_supported(); 3694} 3695JVM_END 3696