jvm.cpp revision 8032:e6d2d68ed87f
1/* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/classLoader.hpp" 27#include "classfile/javaAssertions.hpp" 28#include "classfile/javaClasses.inline.hpp" 29#include "classfile/stringTable.hpp" 30#include "classfile/systemDictionary.hpp" 31#include "classfile/vmSymbols.hpp" 32#include "gc_interface/collectedHeap.inline.hpp" 33#include "interpreter/bytecode.hpp" 34#include "memory/barrierSet.inline.hpp" 35#include "memory/oopFactory.hpp" 36#include "memory/universe.inline.hpp" 37#include "oops/fieldStreams.hpp" 38#include "oops/instanceKlass.hpp" 39#include "oops/objArrayKlass.hpp" 40#include "oops/objArrayOop.inline.hpp" 41#include "oops/method.hpp" 42#include "oops/oop.inline.hpp" 43#include "prims/jvm.h" 44#include "prims/jvm_misc.hpp" 45#include "prims/jvmtiExport.hpp" 46#include "prims/jvmtiThreadState.hpp" 47#include "prims/nativeLookup.hpp" 48#include "prims/privilegedStack.hpp" 49#include "runtime/arguments.hpp" 50#include "runtime/atomic.inline.hpp" 51#include "runtime/handles.inline.hpp" 52#include "runtime/init.hpp" 53#include "runtime/interfaceSupport.hpp" 54#include "runtime/java.hpp" 55#include "runtime/javaCalls.hpp" 56#include "runtime/jfieldIDWorkaround.hpp" 57#include "runtime/orderAccess.inline.hpp" 58#include "runtime/os.inline.hpp" 59#include "runtime/perfData.hpp" 60#include "runtime/reflection.hpp" 61#include "runtime/thread.inline.hpp" 62#include "runtime/vframe.hpp" 63#include "runtime/vm_operations.hpp" 64#include "runtime/vm_version.hpp" 65#include "services/attachListener.hpp" 66#include "services/management.hpp" 67#include "services/threadService.hpp" 68#include "trace/tracing.hpp" 69#include "utilities/copy.hpp" 70#include "utilities/defaultStream.hpp" 71#include "utilities/dtrace.hpp" 72#include "utilities/events.hpp" 73#include "utilities/histogram.hpp" 74#include "utilities/macros.hpp" 75#include "utilities/top.hpp" 76#include "utilities/utf8.hpp" 77#if INCLUDE_CDS 78#include "classfile/sharedClassUtil.hpp" 79#include "classfile/systemDictionaryShared.hpp" 80#endif 81#ifdef TARGET_OS_FAMILY_linux 82# include "jvm_linux.h" 83#endif 84#ifdef TARGET_OS_FAMILY_solaris 85# include "jvm_solaris.h" 86#endif 87#ifdef TARGET_OS_FAMILY_windows 88# include "jvm_windows.h" 89#endif 90#ifdef TARGET_OS_FAMILY_aix 91# include "jvm_aix.h" 92#endif 93#ifdef TARGET_OS_FAMILY_bsd 94# include "jvm_bsd.h" 95#endif 96 97#include <errno.h> 98 99/* 100 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 101 such ctors and calls MUST NOT come between an oop declaration/init and its 102 usage because if objects are move this may cause various memory stomps, bus 103 errors and segfaults. Here is a cookbook for causing so called "naked oop 104 failures": 105 106 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 107 JVMWrapper("JVM_GetClassDeclaredFields"); 108 109 // Object address to be held directly in mirror & not visible to GC 110 oop mirror = JNIHandles::resolve_non_null(ofClass); 111 112 // If this ctor can hit a safepoint, moving objects around, then 113 ComplexConstructor foo; 114 115 // Boom! mirror may point to JUNK instead of the intended object 116 (some dereference of mirror) 117 118 // Here's another call that may block for GC, making mirror stale 119 MutexLocker ml(some_lock); 120 121 // And here's an initializer that can result in a stale oop 122 // all in one step. 123 oop o = call_that_can_throw_exception(TRAPS); 124 125 126 The solution is to keep the oop declaration BELOW the ctor or function 127 call that might cause a GC, do another resolve to reassign the oop, or 128 consider use of a Handle instead of an oop so there is immunity from object 129 motion. But note that the "QUICK" entries below do not have a handlemark 130 and thus can only support use of handles passed in. 131*/ 132 133static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 134 ResourceMark rm; 135 int line_number = -1; 136 const char * source_file = NULL; 137 const char * trace = "explicit"; 138 InstanceKlass* caller = NULL; 139 JavaThread* jthread = JavaThread::current(); 140 if (jthread->has_last_Java_frame()) { 141 vframeStream vfst(jthread); 142 143 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 144 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 145 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 146 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 147 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 148 149 Method* last_caller = NULL; 150 151 while (!vfst.at_end()) { 152 Method* m = vfst.method(); 153 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 154 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 155 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 156 break; 157 } 158 last_caller = m; 159 vfst.next(); 160 } 161 // if this is called from Class.forName0 and that is called from Class.forName, 162 // then print the caller of Class.forName. If this is Class.loadClass, then print 163 // that caller, otherwise keep quiet since this should be picked up elsewhere. 164 bool found_it = false; 165 if (!vfst.at_end() && 166 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 167 vfst.method()->name() == vmSymbols::forName0_name()) { 168 vfst.next(); 169 if (!vfst.at_end() && 170 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 171 vfst.method()->name() == vmSymbols::forName_name()) { 172 vfst.next(); 173 found_it = true; 174 } 175 } else if (last_caller != NULL && 176 last_caller->method_holder()->name() == 177 vmSymbols::java_lang_ClassLoader() && 178 (last_caller->name() == vmSymbols::loadClassInternal_name() || 179 last_caller->name() == vmSymbols::loadClass_name())) { 180 found_it = true; 181 } else if (!vfst.at_end()) { 182 if (vfst.method()->is_native()) { 183 // JNI call 184 found_it = true; 185 } 186 } 187 if (found_it && !vfst.at_end()) { 188 // found the caller 189 caller = vfst.method()->method_holder(); 190 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 191 if (line_number == -1) { 192 // show method name if it's a native method 193 trace = vfst.method()->name_and_sig_as_C_string(); 194 } 195 Symbol* s = caller->source_file_name(); 196 if (s != NULL) { 197 source_file = s->as_C_string(); 198 } 199 } 200 } 201 if (caller != NULL) { 202 if (to_class != caller) { 203 const char * from = caller->external_name(); 204 const char * to = to_class->external_name(); 205 // print in a single call to reduce interleaving between threads 206 if (source_file != NULL) { 207 tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace); 208 } else { 209 tty->print("RESOLVE %s %s (%s)\n", from, to, trace); 210 } 211 } 212 } 213} 214 215void trace_class_resolution(Klass* to_class) { 216 EXCEPTION_MARK; 217 trace_class_resolution_impl(to_class, THREAD); 218 if (HAS_PENDING_EXCEPTION) { 219 CLEAR_PENDING_EXCEPTION; 220 } 221} 222 223// Wrapper to trace JVM functions 224 225#ifdef ASSERT 226 class JVMTraceWrapper : public StackObj { 227 public: 228 JVMTraceWrapper(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) { 229 if (TraceJVMCalls) { 230 va_list ap; 231 va_start(ap, format); 232 tty->print("JVM "); 233 tty->vprint_cr(format, ap); 234 va_end(ap); 235 } 236 } 237 }; 238 239 Histogram* JVMHistogram; 240 volatile jint JVMHistogram_lock = 0; 241 242 class JVMHistogramElement : public HistogramElement { 243 public: 244 JVMHistogramElement(const char* name); 245 }; 246 247 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 248 _name = elementName; 249 uintx count = 0; 250 251 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 252 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 253 count +=1; 254 if ( (WarnOnStalledSpinLock > 0) 255 && (count % WarnOnStalledSpinLock == 0)) { 256 warning("JVMHistogram_lock seems to be stalled"); 257 } 258 } 259 } 260 261 if(JVMHistogram == NULL) 262 JVMHistogram = new Histogram("JVM Call Counts",100); 263 264 JVMHistogram->add_element(this); 265 Atomic::dec(&JVMHistogram_lock); 266 } 267 268 #define JVMCountWrapper(arg) \ 269 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 270 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 271 272 #define JVMWrapper(arg1) JVMCountWrapper(arg1); JVMTraceWrapper(arg1) 273 #define JVMWrapper2(arg1, arg2) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2) 274 #define JVMWrapper3(arg1, arg2, arg3) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3) 275 #define JVMWrapper4(arg1, arg2, arg3, arg4) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3, arg4) 276#else 277 #define JVMWrapper(arg1) 278 #define JVMWrapper2(arg1, arg2) 279 #define JVMWrapper3(arg1, arg2, arg3) 280 #define JVMWrapper4(arg1, arg2, arg3, arg4) 281#endif 282 283 284// Interface version ///////////////////////////////////////////////////////////////////// 285 286 287JVM_LEAF(jint, JVM_GetInterfaceVersion()) 288 return JVM_INTERFACE_VERSION; 289JVM_END 290 291 292// java.lang.System ////////////////////////////////////////////////////////////////////// 293 294 295JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 296 JVMWrapper("JVM_CurrentTimeMillis"); 297 return os::javaTimeMillis(); 298JVM_END 299 300JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 301 JVMWrapper("JVM_NanoTime"); 302 return os::javaTimeNanos(); 303JVM_END 304 305// The function below is actually exposed by sun.misc.VM and not 306// java.lang.System, but we choose to keep it here so that it stays next 307// to JVM_CurrentTimeMillis and JVM_NanoTime 308 309const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 310const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 311 312JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 313 JVMWrapper("JVM_GetNanoTimeAdjustment"); 314 jlong seconds; 315 jlong nanos; 316 317 os::javaTimeSystemUTC(seconds, nanos); 318 319 // We're going to verify that the result can fit in a long. 320 // For that we need the difference in seconds between 'seconds' 321 // and 'offset_secs' to be such that: 322 // |seconds - offset_secs| < (2^63/10^9) 323 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 324 // which makes |seconds - offset_secs| < 2^33 325 // and we will prefer +/- 2^32 as the maximum acceptable diff 326 // as 2^32 has a more natural feel than 2^33... 327 // 328 // So if |seconds - offset_secs| >= 2^32 - we return a special 329 // sentinel value (-1) which the caller should take as an 330 // exception value indicating that the offset given to us is 331 // too far from range of the current time - leading to too big 332 // a nano adjustment. The caller is expected to recover by 333 // computing a more accurate offset and calling this method 334 // again. (For the record 2^32 secs is ~136 years, so that 335 // should rarely happen) 336 // 337 jlong diff = seconds - offset_secs; 338 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 339 return -1; // sentinel value: the offset is too far off the target 340 } 341 342 // return the adjustment. If you compute a time by adding 343 // this number of nanoseconds along with the number of seconds 344 // in the offset you should get the current UTC time. 345 return (diff * (jlong)1000000000) + nanos; 346JVM_END 347 348JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 349 jobject dst, jint dst_pos, jint length)) 350 JVMWrapper("JVM_ArrayCopy"); 351 // Check if we have null pointers 352 if (src == NULL || dst == NULL) { 353 THROW(vmSymbols::java_lang_NullPointerException()); 354 } 355 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 356 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 357 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop"); 358 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop"); 359 // Do copy 360 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 361JVM_END 362 363 364static void set_property(Handle props, const char* key, const char* value, TRAPS) { 365 JavaValue r(T_OBJECT); 366 // public synchronized Object put(Object key, Object value); 367 HandleMark hm(THREAD); 368 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 369 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 370 JavaCalls::call_virtual(&r, 371 props, 372 KlassHandle(THREAD, SystemDictionary::Properties_klass()), 373 vmSymbols::put_name(), 374 vmSymbols::object_object_object_signature(), 375 key_str, 376 value_str, 377 THREAD); 378} 379 380 381#define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 382 383 384JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 385 JVMWrapper("JVM_InitProperties"); 386 ResourceMark rm; 387 388 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 389 390 // System property list includes both user set via -D option and 391 // jvm system specific properties. 392 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 393 PUTPROP(props, p->key(), p->value()); 394 } 395 396 // Convert the -XX:MaxDirectMemorySize= command line flag 397 // to the sun.nio.MaxDirectMemorySize property. 398 // Do this after setting user properties to prevent people 399 // from setting the value with a -D option, as requested. 400 { 401 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 402 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 403 } else { 404 char as_chars[256]; 405 jio_snprintf(as_chars, sizeof(as_chars), SIZE_FORMAT, MaxDirectMemorySize); 406 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 407 } 408 } 409 410 // JVM monitoring and management support 411 // Add the sun.management.compiler property for the compiler's name 412 { 413#undef CSIZE 414#if defined(_LP64) || defined(_WIN64) 415 #define CSIZE "64-Bit " 416#else 417 #define CSIZE 418#endif // 64bit 419 420#ifdef TIERED 421 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 422#else 423#if defined(COMPILER1) 424 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 425#elif defined(COMPILER2) 426 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 427#else 428 const char* compiler_name = ""; 429#endif // compilers 430#endif // TIERED 431 432 if (*compiler_name != '\0' && 433 (Arguments::mode() != Arguments::_int)) { 434 PUTPROP(props, "sun.management.compiler", compiler_name); 435 } 436 } 437 438 return properties; 439JVM_END 440 441 442/* 443 * Return the temporary directory that the VM uses for the attach 444 * and perf data files. 445 * 446 * It is important that this directory is well-known and the 447 * same for all VM instances. It cannot be affected by configuration 448 * variables such as java.io.tmpdir. 449 */ 450JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 451 JVMWrapper("JVM_GetTemporaryDirectory"); 452 HandleMark hm(THREAD); 453 const char* temp_dir = os::get_temp_directory(); 454 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 455 return (jstring) JNIHandles::make_local(env, h()); 456JVM_END 457 458 459// java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 460 461extern volatile jint vm_created; 462 463JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 464 before_exit(thread); 465 vm_exit(code); 466JVM_END 467 468 469JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 470 JVMWrapper("JVM_GC"); 471 if (!DisableExplicitGC) { 472 Universe::heap()->collect(GCCause::_java_lang_system_gc); 473 } 474JVM_END 475 476 477JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 478 JVMWrapper("JVM_MaxObjectInspectionAge"); 479 return Universe::heap()->millis_since_last_gc(); 480JVM_END 481 482 483static inline jlong convert_size_t_to_jlong(size_t val) { 484 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 485 NOT_LP64 (return (jlong)val;) 486 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 487} 488 489JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 490 JVMWrapper("JVM_TotalMemory"); 491 size_t n = Universe::heap()->capacity(); 492 return convert_size_t_to_jlong(n); 493JVM_END 494 495 496JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 497 JVMWrapper("JVM_FreeMemory"); 498 CollectedHeap* ch = Universe::heap(); 499 size_t n; 500 { 501 MutexLocker x(Heap_lock); 502 n = ch->capacity() - ch->used(); 503 } 504 return convert_size_t_to_jlong(n); 505JVM_END 506 507 508JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 509 JVMWrapper("JVM_MaxMemory"); 510 size_t n = Universe::heap()->max_capacity(); 511 return convert_size_t_to_jlong(n); 512JVM_END 513 514 515JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 516 JVMWrapper("JVM_ActiveProcessorCount"); 517 return os::active_processor_count(); 518JVM_END 519 520 521 522// java.lang.Throwable ////////////////////////////////////////////////////// 523 524 525JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 526 JVMWrapper("JVM_FillInStackTrace"); 527 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 528 java_lang_Throwable::fill_in_stack_trace(exception); 529JVM_END 530 531 532JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable)) 533 JVMWrapper("JVM_GetStackTraceDepth"); 534 oop exception = JNIHandles::resolve(throwable); 535 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD); 536JVM_END 537 538 539JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index)) 540 JVMWrapper("JVM_GetStackTraceElement"); 541 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC 542 oop exception = JNIHandles::resolve(throwable); 543 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL); 544 return JNIHandles::make_local(env, element); 545JVM_END 546 547 548// java.lang.Object /////////////////////////////////////////////// 549 550 551JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 552 JVMWrapper("JVM_IHashCode"); 553 // as implemented in the classic virtual machine; return 0 if object is NULL 554 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 555JVM_END 556 557 558JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 559 JVMWrapper("JVM_MonitorWait"); 560 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 561 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 562 if (JvmtiExport::should_post_monitor_wait()) { 563 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 564 565 // The current thread already owns the monitor and it has not yet 566 // been added to the wait queue so the current thread cannot be 567 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 568 // event handler cannot accidentally consume an unpark() meant for 569 // the ParkEvent associated with this ObjectMonitor. 570 } 571 ObjectSynchronizer::wait(obj, ms, CHECK); 572JVM_END 573 574 575JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 576 JVMWrapper("JVM_MonitorNotify"); 577 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 578 ObjectSynchronizer::notify(obj, CHECK); 579JVM_END 580 581 582JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 583 JVMWrapper("JVM_MonitorNotifyAll"); 584 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 585 ObjectSynchronizer::notifyall(obj, CHECK); 586JVM_END 587 588 589JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 590 JVMWrapper("JVM_Clone"); 591 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 592 const KlassHandle klass (THREAD, obj->klass()); 593 JvmtiVMObjectAllocEventCollector oam; 594 595#ifdef ASSERT 596 // Just checking that the cloneable flag is set correct 597 if (obj->is_array()) { 598 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 599 } else { 600 guarantee(obj->is_instance(), "should be instanceOop"); 601 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 602 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 603 } 604#endif 605 606 // Check if class of obj supports the Cloneable interface. 607 // All arrays are considered to be cloneable (See JLS 20.1.5) 608 if (!klass->is_cloneable()) { 609 ResourceMark rm(THREAD); 610 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 611 } 612 613 // Make shallow object copy 614 const int size = obj->size(); 615 oop new_obj_oop = NULL; 616 if (obj->is_array()) { 617 const int length = ((arrayOop)obj())->length(); 618 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 619 } else { 620 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 621 } 622 623 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread 624 // is modifying a reference field in the clonee, a non-oop-atomic copy might 625 // be suspended in the middle of copying the pointer and end up with parts 626 // of two different pointers in the field. Subsequent dereferences will crash. 627 // 4846409: an oop-copy of objects with long or double fields or arrays of same 628 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead 629 // of oops. We know objects are aligned on a minimum of an jlong boundary. 630 // The same is true of StubRoutines::object_copy and the various oop_copy 631 // variants, and of the code generated by the inline_native_clone intrinsic. 632 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); 633 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop, 634 (size_t)align_object_size(size) / HeapWordsPerLong); 635 // Clear the header 636 new_obj_oop->init_mark(); 637 638 // Store check (mark entire object and let gc sort it out) 639 BarrierSet* bs = Universe::heap()->barrier_set(); 640 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); 641 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); 642 643 Handle new_obj(THREAD, new_obj_oop); 644 // Special handling for MemberNames. Since they contain Method* metadata, they 645 // must be registered so that RedefineClasses can fix metadata contained in them. 646 if (java_lang_invoke_MemberName::is_instance(new_obj()) && 647 java_lang_invoke_MemberName::is_method(new_obj())) { 648 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj()); 649 // MemberName may be unresolved, so doesn't need registration until resolved. 650 if (method != NULL) { 651 methodHandle m(THREAD, method); 652 // This can safepoint and redefine method, so need both new_obj and method 653 // in a handle, for two different reasons. new_obj can move, method can be 654 // deleted if nothing is using it on the stack. 655 m->method_holder()->add_member_name(new_obj()); 656 } 657 } 658 659 // Caution: this involves a java upcall, so the clone should be 660 // "gc-robust" by this stage. 661 if (klass->has_finalizer()) { 662 assert(obj->is_instance(), "should be instanceOop"); 663 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 664 new_obj = Handle(THREAD, new_obj_oop); 665 } 666 667 return JNIHandles::make_local(env, new_obj()); 668JVM_END 669 670// java.io.File /////////////////////////////////////////////////////////////// 671 672JVM_LEAF(char*, JVM_NativePath(char* path)) 673 JVMWrapper2("JVM_NativePath (%s)", path); 674 return os::native_path(path); 675JVM_END 676 677 678// Misc. class handling /////////////////////////////////////////////////////////// 679 680 681JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 682 JVMWrapper("JVM_GetCallerClass"); 683 684 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 685 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 686 // temporarily for existing code to use until a replacement API is defined. 687 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 688 Klass* k = thread->security_get_caller_class(depth); 689 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 690 } 691 692 // Getting the class of the caller frame. 693 // 694 // The call stack at this point looks something like this: 695 // 696 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 697 // [1] [ @CallerSensitive API.method ] 698 // [.] [ (skipped intermediate frames) ] 699 // [n] [ caller ] 700 vframeStream vfst(thread); 701 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 702 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 703 Method* m = vfst.method(); 704 assert(m != NULL, "sanity"); 705 switch (n) { 706 case 0: 707 // This must only be called from Reflection.getCallerClass 708 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 709 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 710 } 711 // fall-through 712 case 1: 713 // Frame 0 and 1 must be caller sensitive. 714 if (!m->caller_sensitive()) { 715 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 716 } 717 break; 718 default: 719 if (!m->is_ignored_by_security_stack_walk()) { 720 // We have reached the desired frame; return the holder class. 721 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 722 } 723 break; 724 } 725 } 726 return NULL; 727JVM_END 728 729 730JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 731 JVMWrapper("JVM_FindPrimitiveClass"); 732 oop mirror = NULL; 733 BasicType t = name2type(utf); 734 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 735 mirror = Universe::java_mirror(t); 736 } 737 if (mirror == NULL) { 738 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 739 } else { 740 return (jclass) JNIHandles::make_local(env, mirror); 741 } 742JVM_END 743 744 745// Returns a class loaded by the bootstrap class loader; or null 746// if not found. ClassNotFoundException is not thrown. 747// FindClassFromBootLoader is exported to the launcher for windows. 748JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 749 const char* name)) 750 JVMWrapper2("JVM_FindClassFromBootLoader %s", name); 751 752 // Java libraries should ensure that name is never null... 753 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 754 // It's impossible to create this class; the name cannot fit 755 // into the constant pool. 756 return NULL; 757 } 758 759 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 760 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 761 if (k == NULL) { 762 return NULL; 763 } 764 765 if (TraceClassResolution) { 766 trace_class_resolution(k); 767 } 768 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 769JVM_END 770 771// Find a class with this name in this loader, using the caller's protection domain. 772JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 773 jboolean init, jobject loader, 774 jclass caller)) 775 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name); 776 // Java libraries should ensure that name is never null... 777 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 778 // It's impossible to create this class; the name cannot fit 779 // into the constant pool. 780 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 781 } 782 783 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 784 785 oop loader_oop = JNIHandles::resolve(loader); 786 oop from_class = JNIHandles::resolve(caller); 787 oop protection_domain = NULL; 788 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 789 // NPE. Put it in another way, the bootstrap class loader has all permission and 790 // thus no checkPackageAccess equivalence in the VM class loader. 791 // The caller is also passed as NULL by the java code if there is no security 792 // manager to avoid the performance cost of getting the calling class. 793 if (from_class != NULL && loader_oop != NULL) { 794 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 795 } 796 797 Handle h_loader(THREAD, loader_oop); 798 Handle h_prot(THREAD, protection_domain); 799 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 800 h_prot, false, THREAD); 801 802 if (TraceClassResolution && result != NULL) { 803 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 804 } 805 return result; 806JVM_END 807 808JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 809 jboolean init, jclass from)) 810 JVMWrapper2("JVM_FindClassFromClass %s", name); 811 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 812 // It's impossible to create this class; the name cannot fit 813 // into the constant pool. 814 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 815 } 816 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 817 oop from_class_oop = JNIHandles::resolve(from); 818 Klass* from_class = (from_class_oop == NULL) 819 ? (Klass*)NULL 820 : java_lang_Class::as_Klass(from_class_oop); 821 oop class_loader = NULL; 822 oop protection_domain = NULL; 823 if (from_class != NULL) { 824 class_loader = from_class->class_loader(); 825 protection_domain = from_class->protection_domain(); 826 } 827 Handle h_loader(THREAD, class_loader); 828 Handle h_prot (THREAD, protection_domain); 829 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 830 h_prot, true, thread); 831 832 if (TraceClassResolution && result != NULL) { 833 // this function is generally only used for class loading during verification. 834 ResourceMark rm; 835 oop from_mirror = JNIHandles::resolve_non_null(from); 836 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 837 const char * from_name = from_class->external_name(); 838 839 oop mirror = JNIHandles::resolve_non_null(result); 840 Klass* to_class = java_lang_Class::as_Klass(mirror); 841 const char * to = to_class->external_name(); 842 tty->print("RESOLVE %s %s (verification)\n", from_name, to); 843 } 844 845 return result; 846JVM_END 847 848static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 849 if (loader.is_null()) { 850 return; 851 } 852 853 // check whether the current caller thread holds the lock or not. 854 // If not, increment the corresponding counter 855 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 856 ObjectSynchronizer::owner_self) { 857 counter->inc(); 858 } 859} 860 861// common code for JVM_DefineClass() and JVM_DefineClassWithSource() 862// and JVM_DefineClassWithSourceCond() 863static jclass jvm_define_class_common(JNIEnv *env, const char *name, 864 jobject loader, const jbyte *buf, 865 jsize len, jobject pd, const char *source, 866 jboolean verify, TRAPS) { 867 if (source == NULL) source = "__JVM_DefineClass__"; 868 869 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 870 JavaThread* jt = (JavaThread*) THREAD; 871 872 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 873 ClassLoader::perf_define_appclass_selftime(), 874 ClassLoader::perf_define_appclasses(), 875 jt->get_thread_stat()->perf_recursion_counts_addr(), 876 jt->get_thread_stat()->perf_timers_addr(), 877 PerfClassTraceTime::DEFINE_CLASS); 878 879 if (UsePerfData) { 880 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 881 } 882 883 // Since exceptions can be thrown, class initialization can take place 884 // if name is NULL no check for class name in .class stream has to be made. 885 TempNewSymbol class_name = NULL; 886 if (name != NULL) { 887 const int str_len = (int)strlen(name); 888 if (str_len > Symbol::max_length()) { 889 // It's impossible to create this class; the name cannot fit 890 // into the constant pool. 891 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 892 } 893 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 894 } 895 896 ResourceMark rm(THREAD); 897 ClassFileStream st((u1*) buf, len, (char *)source); 898 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 899 if (UsePerfData) { 900 is_lock_held_by_thread(class_loader, 901 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 902 THREAD); 903 } 904 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 905 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader, 906 protection_domain, &st, 907 verify != 0, 908 CHECK_NULL); 909 910 if (TraceClassResolution && k != NULL) { 911 trace_class_resolution(k); 912 } 913 914 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 915} 916 917 918JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 919 JVMWrapper2("JVM_DefineClass %s", name); 920 921 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD); 922JVM_END 923 924 925JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 926 JVMWrapper2("JVM_DefineClassWithSource %s", name); 927 928 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD); 929JVM_END 930 931JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name, 932 jobject loader, const jbyte *buf, 933 jsize len, jobject pd, 934 const char *source, jboolean verify)) 935 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name); 936 937 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD); 938JVM_END 939 940JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 941 JVMWrapper("JVM_FindLoadedClass"); 942 ResourceMark rm(THREAD); 943 944 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 945 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 946 947 const char* str = java_lang_String::as_utf8_string(string()); 948 // Sanity check, don't expect null 949 if (str == NULL) return NULL; 950 951 const int str_len = (int)strlen(str); 952 if (str_len > Symbol::max_length()) { 953 // It's impossible to create this class; the name cannot fit 954 // into the constant pool. 955 return NULL; 956 } 957 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 958 959 // Security Note: 960 // The Java level wrapper will perform the necessary security check allowing 961 // us to pass the NULL as the initiating class loader. 962 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 963 if (UsePerfData) { 964 is_lock_held_by_thread(h_loader, 965 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 966 THREAD); 967 } 968 969 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 970 h_loader, 971 Handle(), 972 CHECK_NULL); 973#if INCLUDE_CDS 974 if (k == NULL) { 975 // If the class is not already loaded, try to see if it's in the shared 976 // archive for the current classloader (h_loader). 977 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class( 978 klass_name, h_loader, CHECK_NULL); 979 k = ik(); 980 } 981#endif 982 return (k == NULL) ? NULL : 983 (jclass) JNIHandles::make_local(env, k->java_mirror()); 984JVM_END 985 986 987// Reflection support ////////////////////////////////////////////////////////////////////////////// 988 989JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 990 assert (cls != NULL, "illegal class"); 991 JVMWrapper("JVM_GetClassName"); 992 JvmtiVMObjectAllocEventCollector oam; 993 ResourceMark rm(THREAD); 994 const char* name; 995 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 996 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 997 } else { 998 // Consider caching interned string in Klass 999 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1000 assert(k->is_klass(), "just checking"); 1001 name = k->external_name(); 1002 } 1003 oop result = StringTable::intern((char*) name, CHECK_NULL); 1004 return (jstring) JNIHandles::make_local(env, result); 1005JVM_END 1006 1007 1008JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1009 JVMWrapper("JVM_GetClassInterfaces"); 1010 JvmtiVMObjectAllocEventCollector oam; 1011 oop mirror = JNIHandles::resolve_non_null(cls); 1012 1013 // Special handling for primitive objects 1014 if (java_lang_Class::is_primitive(mirror)) { 1015 // Primitive objects does not have any interfaces 1016 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1017 return (jobjectArray) JNIHandles::make_local(env, r); 1018 } 1019 1020 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror)); 1021 // Figure size of result array 1022 int size; 1023 if (klass->oop_is_instance()) { 1024 size = InstanceKlass::cast(klass())->local_interfaces()->length(); 1025 } else { 1026 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass"); 1027 size = 2; 1028 } 1029 1030 // Allocate result array 1031 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1032 objArrayHandle result (THREAD, r); 1033 // Fill in result 1034 if (klass->oop_is_instance()) { 1035 // Regular instance klass, fill in all local interfaces 1036 for (int index = 0; index < size; index++) { 1037 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index); 1038 result->obj_at_put(index, k->java_mirror()); 1039 } 1040 } else { 1041 // All arrays implement java.lang.Cloneable and java.io.Serializable 1042 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1043 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1044 } 1045 return (jobjectArray) JNIHandles::make_local(env, result()); 1046JVM_END 1047 1048 1049JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1050 JVMWrapper("JVM_IsInterface"); 1051 oop mirror = JNIHandles::resolve_non_null(cls); 1052 if (java_lang_Class::is_primitive(mirror)) { 1053 return JNI_FALSE; 1054 } 1055 Klass* k = java_lang_Class::as_Klass(mirror); 1056 jboolean result = k->is_interface(); 1057 assert(!result || k->oop_is_instance(), 1058 "all interfaces are instance types"); 1059 // The compiler intrinsic for isInterface tests the 1060 // Klass::_access_flags bits in the same way. 1061 return result; 1062JVM_END 1063 1064 1065JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1066 JVMWrapper("JVM_GetClassSigners"); 1067 JvmtiVMObjectAllocEventCollector oam; 1068 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1069 // There are no signers for primitive types 1070 return NULL; 1071 } 1072 1073 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1074 1075 // If there are no signers set in the class, or if the class 1076 // is an array, return NULL. 1077 if (signers == NULL) return NULL; 1078 1079 // copy of the signers array 1080 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1081 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1082 for (int index = 0; index < signers->length(); index++) { 1083 signers_copy->obj_at_put(index, signers->obj_at(index)); 1084 } 1085 1086 // return the copy 1087 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1088JVM_END 1089 1090 1091JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1092 JVMWrapper("JVM_SetClassSigners"); 1093 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1094 // This call is ignored for primitive types and arrays. 1095 // Signers are only set once, ClassLoader.java, and thus shouldn't 1096 // be called with an array. Only the bootstrap loader creates arrays. 1097 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1098 if (k->oop_is_instance()) { 1099 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1100 } 1101 } 1102JVM_END 1103 1104 1105JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1106 JVMWrapper("JVM_GetProtectionDomain"); 1107 if (JNIHandles::resolve(cls) == NULL) { 1108 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1109 } 1110 1111 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1112 // Primitive types does not have a protection domain. 1113 return NULL; 1114 } 1115 1116 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1117 return (jobject) JNIHandles::make_local(env, pd); 1118JVM_END 1119 1120 1121static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) { 1122 // If there is a security manager and protection domain, check the access 1123 // in the protection domain, otherwise it is authorized. 1124 if (java_lang_System::has_security_manager()) { 1125 1126 // For bootstrapping, if pd implies method isn't in the JDK, allow 1127 // this context to revert to older behavior. 1128 // In this case the isAuthorized field in AccessControlContext is also not 1129 // present. 1130 if (Universe::protection_domain_implies_method() == NULL) { 1131 return true; 1132 } 1133 1134 // Whitelist certain access control contexts 1135 if (java_security_AccessControlContext::is_authorized(context)) { 1136 return true; 1137 } 1138 1139 oop prot = klass->protection_domain(); 1140 if (prot != NULL) { 1141 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1142 // in the new wrapper. 1143 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1144 Handle h_prot(THREAD, prot); 1145 JavaValue result(T_BOOLEAN); 1146 JavaCallArguments args(h_prot); 1147 JavaCalls::call(&result, m, &args, CHECK_false); 1148 return (result.get_jboolean() != 0); 1149 } 1150 } 1151 return true; 1152} 1153 1154// Create an AccessControlContext with a protection domain with null codesource 1155// and null permissions - which gives no permissions. 1156oop create_dummy_access_control_context(TRAPS) { 1157 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass()); 1158 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1159 // Call constructor ProtectionDomain(null, null); 1160 JavaValue result(T_VOID); 1161 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass), 1162 vmSymbols::object_initializer_name(), 1163 vmSymbols::codesource_permissioncollection_signature(), 1164 Handle(), Handle(), CHECK_NULL); 1165 1166 // new ProtectionDomain[] {pd}; 1167 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1168 context->obj_at_put(0, obj()); 1169 1170 // new AccessControlContext(new ProtectionDomain[] {pd}) 1171 objArrayHandle h_context(THREAD, context); 1172 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1173 return acc; 1174} 1175 1176JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1177 JVMWrapper("JVM_DoPrivileged"); 1178 1179 if (action == NULL) { 1180 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1181 } 1182 1183 // Compute the frame initiating the do privileged operation and setup the privileged stack 1184 vframeStream vfst(thread); 1185 vfst.security_get_caller_frame(1); 1186 1187 if (vfst.at_end()) { 1188 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1189 } 1190 1191 Method* method = vfst.method(); 1192 instanceKlassHandle klass (THREAD, method->method_holder()); 1193 1194 // Check that action object understands "Object run()" 1195 Handle h_context; 1196 if (context != NULL) { 1197 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1198 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1199 if (!authorized) { 1200 // Create an unprivileged access control object and call it's run function 1201 // instead. 1202 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1203 h_context = Handle(THREAD, noprivs); 1204 } 1205 } 1206 1207 // Check that action object understands "Object run()" 1208 Handle object (THREAD, JNIHandles::resolve(action)); 1209 1210 // get run() method 1211 Method* m_oop = object->klass()->uncached_lookup_method( 1212 vmSymbols::run_method_name(), 1213 vmSymbols::void_object_signature(), 1214 Klass::find_overpass); 1215 methodHandle m (THREAD, m_oop); 1216 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { 1217 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1218 } 1219 1220 // Stack allocated list of privileged stack elements 1221 PrivilegedElement pi; 1222 if (!vfst.at_end()) { 1223 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1224 thread->set_privileged_stack_top(&pi); 1225 } 1226 1227 1228 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1229 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1230 Handle pending_exception; 1231 JavaValue result(T_OBJECT); 1232 JavaCallArguments args(object); 1233 JavaCalls::call(&result, m, &args, THREAD); 1234 1235 // done with action, remove ourselves from the list 1236 if (!vfst.at_end()) { 1237 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1238 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1239 } 1240 1241 if (HAS_PENDING_EXCEPTION) { 1242 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1243 CLEAR_PENDING_EXCEPTION; 1244 // JVMTI has already reported the pending exception 1245 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1246 if (THREAD->is_Java_thread()) { 1247 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1248 } 1249 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1250 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1251 // Throw a java.security.PrivilegedActionException(Exception e) exception 1252 JavaCallArguments args(pending_exception); 1253 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1254 vmSymbols::exception_void_signature(), 1255 &args); 1256 } 1257 } 1258 1259 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1260 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1261JVM_END 1262 1263 1264// Returns the inherited_access_control_context field of the running thread. 1265JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1266 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1267 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1268 return JNIHandles::make_local(env, result); 1269JVM_END 1270 1271class RegisterArrayForGC { 1272 private: 1273 JavaThread *_thread; 1274 public: 1275 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1276 _thread = thread; 1277 _thread->register_array_for_gc(array); 1278 } 1279 1280 ~RegisterArrayForGC() { 1281 _thread->register_array_for_gc(NULL); 1282 } 1283}; 1284 1285 1286JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1287 JVMWrapper("JVM_GetStackAccessControlContext"); 1288 if (!UsePrivilegedStack) return NULL; 1289 1290 ResourceMark rm(THREAD); 1291 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1292 JvmtiVMObjectAllocEventCollector oam; 1293 1294 // count the protection domains on the execution stack. We collapse 1295 // duplicate consecutive protection domains into a single one, as 1296 // well as stopping when we hit a privileged frame. 1297 1298 // Use vframeStream to iterate through Java frames 1299 vframeStream vfst(thread); 1300 1301 oop previous_protection_domain = NULL; 1302 Handle privileged_context(thread, NULL); 1303 bool is_privileged = false; 1304 oop protection_domain = NULL; 1305 1306 for(; !vfst.at_end(); vfst.next()) { 1307 // get method of frame 1308 Method* method = vfst.method(); 1309 intptr_t* frame_id = vfst.frame_id(); 1310 1311 // check the privileged frames to see if we have a match 1312 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1313 // this frame is privileged 1314 is_privileged = true; 1315 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1316 protection_domain = thread->privileged_stack_top()->protection_domain(); 1317 } else { 1318 protection_domain = method->method_holder()->protection_domain(); 1319 } 1320 1321 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1322 local_array->push(protection_domain); 1323 previous_protection_domain = protection_domain; 1324 } 1325 1326 if (is_privileged) break; 1327 } 1328 1329 1330 // either all the domains on the stack were system domains, or 1331 // we had a privileged system domain 1332 if (local_array->is_empty()) { 1333 if (is_privileged && privileged_context.is_null()) return NULL; 1334 1335 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1336 return JNIHandles::make_local(env, result); 1337 } 1338 1339 // the resource area must be registered in case of a gc 1340 RegisterArrayForGC ragc(thread, local_array); 1341 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1342 local_array->length(), CHECK_NULL); 1343 objArrayHandle h_context(thread, context); 1344 for (int index = 0; index < local_array->length(); index++) { 1345 h_context->obj_at_put(index, local_array->at(index)); 1346 } 1347 1348 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1349 1350 return JNIHandles::make_local(env, result); 1351JVM_END 1352 1353 1354JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1355 JVMWrapper("JVM_IsArrayClass"); 1356 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1357 return (k != NULL) && k->oop_is_array() ? true : false; 1358JVM_END 1359 1360 1361JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1362 JVMWrapper("JVM_IsPrimitiveClass"); 1363 oop mirror = JNIHandles::resolve_non_null(cls); 1364 return (jboolean) java_lang_Class::is_primitive(mirror); 1365JVM_END 1366 1367 1368JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1369 JVMWrapper("JVM_GetClassModifiers"); 1370 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1371 // Primitive type 1372 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1373 } 1374 1375 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1376 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1377 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1378 return k->modifier_flags(); 1379JVM_END 1380 1381 1382// Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1383 1384JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1385 JvmtiVMObjectAllocEventCollector oam; 1386 // ofClass is a reference to a java_lang_Class object. The mirror object 1387 // of an InstanceKlass 1388 1389 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1390 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1391 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1392 return (jobjectArray)JNIHandles::make_local(env, result); 1393 } 1394 1395 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1396 InnerClassesIterator iter(k); 1397 1398 if (iter.length() == 0) { 1399 // Neither an inner nor outer class 1400 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1401 return (jobjectArray)JNIHandles::make_local(env, result); 1402 } 1403 1404 // find inner class info 1405 constantPoolHandle cp(thread, k->constants()); 1406 int length = iter.length(); 1407 1408 // Allocate temp. result array 1409 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1410 objArrayHandle result (THREAD, r); 1411 int members = 0; 1412 1413 for (; !iter.done(); iter.next()) { 1414 int ioff = iter.inner_class_info_index(); 1415 int ooff = iter.outer_class_info_index(); 1416 1417 if (ioff != 0 && ooff != 0) { 1418 // Check to see if the name matches the class we're looking for 1419 // before attempting to find the class. 1420 if (cp->klass_name_at_matches(k, ooff)) { 1421 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1422 if (outer_klass == k()) { 1423 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1424 instanceKlassHandle inner_klass (THREAD, ik); 1425 1426 // Throws an exception if outer klass has not declared k as 1427 // an inner klass 1428 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1429 1430 result->obj_at_put(members, inner_klass->java_mirror()); 1431 members++; 1432 } 1433 } 1434 } 1435 } 1436 1437 if (members != length) { 1438 // Return array of right length 1439 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1440 for(int i = 0; i < members; i++) { 1441 res->obj_at_put(i, result->obj_at(i)); 1442 } 1443 return (jobjectArray)JNIHandles::make_local(env, res); 1444 } 1445 1446 return (jobjectArray)JNIHandles::make_local(env, result()); 1447JVM_END 1448 1449 1450JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1451{ 1452 // ofClass is a reference to a java_lang_Class object. 1453 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1454 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) { 1455 return NULL; 1456 } 1457 1458 bool inner_is_member = false; 1459 Klass* outer_klass 1460 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1461 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1462 if (outer_klass == NULL) return NULL; // already a top-level class 1463 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1464 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1465} 1466JVM_END 1467 1468// should be in InstanceKlass.cpp, but is here for historical reasons 1469Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle k, 1470 bool* inner_is_member, 1471 TRAPS) { 1472 Thread* thread = THREAD; 1473 InnerClassesIterator iter(k); 1474 if (iter.length() == 0) { 1475 // No inner class info => no declaring class 1476 return NULL; 1477 } 1478 1479 constantPoolHandle i_cp(thread, k->constants()); 1480 1481 bool found = false; 1482 Klass* ok; 1483 instanceKlassHandle outer_klass; 1484 *inner_is_member = false; 1485 1486 // Find inner_klass attribute 1487 for (; !iter.done() && !found; iter.next()) { 1488 int ioff = iter.inner_class_info_index(); 1489 int ooff = iter.outer_class_info_index(); 1490 int noff = iter.inner_name_index(); 1491 if (ioff != 0) { 1492 // Check to see if the name matches the class we're looking for 1493 // before attempting to find the class. 1494 if (i_cp->klass_name_at_matches(k, ioff)) { 1495 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_NULL); 1496 found = (k() == inner_klass); 1497 if (found && ooff != 0) { 1498 ok = i_cp->klass_at(ooff, CHECK_NULL); 1499 outer_klass = instanceKlassHandle(thread, ok); 1500 *inner_is_member = true; 1501 } 1502 } 1503 } 1504 } 1505 1506 if (found && outer_klass.is_null()) { 1507 // It may be anonymous; try for that. 1508 int encl_method_class_idx = k->enclosing_method_class_index(); 1509 if (encl_method_class_idx != 0) { 1510 ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL); 1511 outer_klass = instanceKlassHandle(thread, ok); 1512 *inner_is_member = false; 1513 } 1514 } 1515 1516 // If no inner class attribute found for this class. 1517 if (outer_klass.is_null()) return NULL; 1518 1519 // Throws an exception if outer klass has not declared k as an inner klass 1520 // We need evidence that each klass knows about the other, or else 1521 // the system could allow a spoof of an inner class to gain access rights. 1522 Reflection::check_for_inner_class(outer_klass, k, *inner_is_member, CHECK_NULL); 1523 return outer_klass(); 1524} 1525 1526JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1527 assert (cls != NULL, "illegal class"); 1528 JVMWrapper("JVM_GetClassSignature"); 1529 JvmtiVMObjectAllocEventCollector oam; 1530 ResourceMark rm(THREAD); 1531 // Return null for arrays and primatives 1532 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1533 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1534 if (k->oop_is_instance()) { 1535 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1536 if (sym == NULL) return NULL; 1537 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1538 return (jstring) JNIHandles::make_local(env, str()); 1539 } 1540 } 1541 return NULL; 1542JVM_END 1543 1544 1545JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1546 assert (cls != NULL, "illegal class"); 1547 JVMWrapper("JVM_GetClassAnnotations"); 1548 1549 // Return null for arrays and primitives 1550 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1551 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1552 if (k->oop_is_instance()) { 1553 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1554 return (jbyteArray) JNIHandles::make_local(env, a); 1555 } 1556 } 1557 return NULL; 1558JVM_END 1559 1560 1561static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1562 // some of this code was adapted from from jni_FromReflectedField 1563 1564 oop reflected = JNIHandles::resolve_non_null(field); 1565 oop mirror = java_lang_reflect_Field::clazz(reflected); 1566 Klass* k = java_lang_Class::as_Klass(mirror); 1567 int slot = java_lang_reflect_Field::slot(reflected); 1568 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1569 1570 KlassHandle kh(THREAD, k); 1571 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot); 1572 1573 if (modifiers & JVM_ACC_STATIC) { 1574 // for static fields we only look in the current class 1575 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) { 1576 assert(false, "cannot find static field"); 1577 return false; 1578 } 1579 } else { 1580 // for instance fields we start with the current class and work 1581 // our way up through the superclass chain 1582 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) { 1583 assert(false, "cannot find instance field"); 1584 return false; 1585 } 1586 } 1587 return true; 1588} 1589 1590static Method* jvm_get_method_common(jobject method) { 1591 // some of this code was adapted from from jni_FromReflectedMethod 1592 1593 oop reflected = JNIHandles::resolve_non_null(method); 1594 oop mirror = NULL; 1595 int slot = 0; 1596 1597 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1598 mirror = java_lang_reflect_Constructor::clazz(reflected); 1599 slot = java_lang_reflect_Constructor::slot(reflected); 1600 } else { 1601 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1602 "wrong type"); 1603 mirror = java_lang_reflect_Method::clazz(reflected); 1604 slot = java_lang_reflect_Method::slot(reflected); 1605 } 1606 Klass* k = java_lang_Class::as_Klass(mirror); 1607 1608 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1609 assert(m != NULL, "cannot find method"); 1610 return m; // caller has to deal with NULL in product mode 1611} 1612 1613/* Type use annotations support (JDK 1.8) */ 1614 1615JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1616 assert (cls != NULL, "illegal class"); 1617 JVMWrapper("JVM_GetClassTypeAnnotations"); 1618 ResourceMark rm(THREAD); 1619 // Return null for arrays and primitives 1620 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1621 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1622 if (k->oop_is_instance()) { 1623 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_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 } 1630 return NULL; 1631JVM_END 1632 1633JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1634 assert (method != NULL, "illegal method"); 1635 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1636 1637 // method is a handle to a java.lang.reflect.Method object 1638 Method* m = jvm_get_method_common(method); 1639 if (m == NULL) { 1640 return NULL; 1641 } 1642 1643 AnnotationArray* type_annotations = m->type_annotations(); 1644 if (type_annotations != NULL) { 1645 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1646 return (jbyteArray) JNIHandles::make_local(env, a); 1647 } 1648 1649 return NULL; 1650JVM_END 1651 1652JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1653 assert (field != NULL, "illegal field"); 1654 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1655 1656 fieldDescriptor fd; 1657 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1658 if (!gotFd) { 1659 return NULL; 1660 } 1661 1662 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1663JVM_END 1664 1665static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { 1666 if (!cp->is_within_bounds(index)) { 1667 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1668 } 1669} 1670 1671JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1672{ 1673 JVMWrapper("JVM_GetMethodParameters"); 1674 // method is a handle to a java.lang.reflect.Method object 1675 Method* method_ptr = jvm_get_method_common(method); 1676 methodHandle mh (THREAD, method_ptr); 1677 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1678 const int num_params = mh->method_parameters_length(); 1679 1680 if (num_params < 0) { 1681 // A -1 return value from method_parameters_length means there is no 1682 // parameter data. Return null to indicate this to the reflection 1683 // API. 1684 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1685 return (jobjectArray)NULL; 1686 } else { 1687 // Otherwise, we return something up to reflection, even if it is 1688 // a zero-length array. Why? Because in some cases this can 1689 // trigger a MalformedParametersException. 1690 1691 // make sure all the symbols are properly formatted 1692 for (int i = 0; i < num_params; i++) { 1693 MethodParametersElement* params = mh->method_parameters_start(); 1694 int index = params[i].name_cp_index; 1695 bounds_check(mh->constants(), index, CHECK_NULL); 1696 1697 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1698 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1699 "Wrong type at constant pool index"); 1700 } 1701 1702 } 1703 1704 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1705 objArrayHandle result (THREAD, result_oop); 1706 1707 for (int i = 0; i < num_params; i++) { 1708 MethodParametersElement* params = mh->method_parameters_start(); 1709 // For a 0 index, give a NULL symbol 1710 Symbol* sym = 0 != params[i].name_cp_index ? 1711 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1712 int flags = params[i].flags; 1713 oop param = Reflection::new_parameter(reflected_method, i, sym, 1714 flags, CHECK_NULL); 1715 result->obj_at_put(i, param); 1716 } 1717 return (jobjectArray)JNIHandles::make_local(env, result()); 1718 } 1719} 1720JVM_END 1721 1722// New (JDK 1.4) reflection implementation ///////////////////////////////////// 1723 1724JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1725{ 1726 JVMWrapper("JVM_GetClassDeclaredFields"); 1727 JvmtiVMObjectAllocEventCollector oam; 1728 1729 // Exclude primitive types and array types 1730 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1731 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 1732 // Return empty array 1733 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1734 return (jobjectArray) JNIHandles::make_local(env, res); 1735 } 1736 1737 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1738 constantPoolHandle cp(THREAD, k->constants()); 1739 1740 // Ensure class is linked 1741 k->link_class(CHECK_NULL); 1742 1743 // 4496456 We need to filter out java.lang.Throwable.backtrace 1744 bool skip_backtrace = false; 1745 1746 // Allocate result 1747 int num_fields; 1748 1749 if (publicOnly) { 1750 num_fields = 0; 1751 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) { 1752 if (fs.access_flags().is_public()) ++num_fields; 1753 } 1754 } else { 1755 num_fields = k->java_fields_count(); 1756 1757 if (k() == SystemDictionary::Throwable_klass()) { 1758 num_fields--; 1759 skip_backtrace = true; 1760 } 1761 } 1762 1763 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1764 objArrayHandle result (THREAD, r); 1765 1766 int out_idx = 0; 1767 fieldDescriptor fd; 1768 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1769 if (skip_backtrace) { 1770 // 4496456 skip java.lang.Throwable.backtrace 1771 int offset = fs.offset(); 1772 if (offset == java_lang_Throwable::get_backtrace_offset()) continue; 1773 } 1774 1775 if (!publicOnly || fs.access_flags().is_public()) { 1776 fd.reinitialize(k(), fs.index()); 1777 oop field = Reflection::new_field(&fd, CHECK_NULL); 1778 result->obj_at_put(out_idx, field); 1779 ++out_idx; 1780 } 1781 } 1782 assert(out_idx == num_fields, "just checking"); 1783 return (jobjectArray) JNIHandles::make_local(env, result()); 1784} 1785JVM_END 1786 1787static bool select_method(methodHandle method, bool want_constructor) { 1788 if (want_constructor) { 1789 return (method->is_initializer() && !method->is_static()); 1790 } else { 1791 return (!method->is_initializer() && !method->is_overpass()); 1792 } 1793} 1794 1795static jobjectArray get_class_declared_methods_helper( 1796 JNIEnv *env, 1797 jclass ofClass, jboolean publicOnly, 1798 bool want_constructor, 1799 Klass* klass, TRAPS) { 1800 1801 JvmtiVMObjectAllocEventCollector oam; 1802 1803 // Exclude primitive types and array types 1804 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1805 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) { 1806 // Return empty array 1807 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1808 return (jobjectArray) JNIHandles::make_local(env, res); 1809 } 1810 1811 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1812 1813 // Ensure class is linked 1814 k->link_class(CHECK_NULL); 1815 1816 Array<Method*>* methods = k->methods(); 1817 int methods_length = methods->length(); 1818 1819 // Save original method_idnum in case of redefinition, which can change 1820 // the idnum of obsolete methods. The new method will have the same idnum 1821 // but if we refresh the methods array, the counts will be wrong. 1822 ResourceMark rm(THREAD); 1823 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1824 int num_methods = 0; 1825 1826 for (int i = 0; i < methods_length; i++) { 1827 methodHandle method(THREAD, methods->at(i)); 1828 if (select_method(method, want_constructor)) { 1829 if (!publicOnly || method->is_public()) { 1830 idnums->push(method->method_idnum()); 1831 ++num_methods; 1832 } 1833 } 1834 } 1835 1836 // Allocate result 1837 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1838 objArrayHandle result (THREAD, r); 1839 1840 // Now just put the methods that we selected above, but go by their idnum 1841 // in case of redefinition. The methods can be redefined at any safepoint, 1842 // so above when allocating the oop array and below when creating reflect 1843 // objects. 1844 for (int i = 0; i < num_methods; i++) { 1845 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1846 if (method.is_null()) { 1847 // Method may have been deleted and seems this API can handle null 1848 // Otherwise should probably put a method that throws NSME 1849 result->obj_at_put(i, NULL); 1850 } else { 1851 oop m; 1852 if (want_constructor) { 1853 m = Reflection::new_constructor(method, CHECK_NULL); 1854 } else { 1855 m = Reflection::new_method(method, false, CHECK_NULL); 1856 } 1857 result->obj_at_put(i, m); 1858 } 1859 } 1860 1861 return (jobjectArray) JNIHandles::make_local(env, result()); 1862} 1863 1864JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1865{ 1866 JVMWrapper("JVM_GetClassDeclaredMethods"); 1867 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1868 /*want_constructor*/ false, 1869 SystemDictionary::reflect_Method_klass(), THREAD); 1870} 1871JVM_END 1872 1873JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1874{ 1875 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1876 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1877 /*want_constructor*/ true, 1878 SystemDictionary::reflect_Constructor_klass(), THREAD); 1879} 1880JVM_END 1881 1882JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1883{ 1884 JVMWrapper("JVM_GetClassAccessFlags"); 1885 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1886 // Primitive type 1887 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1888 } 1889 1890 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1891 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1892} 1893JVM_END 1894 1895 1896// Constant pool access ////////////////////////////////////////////////////////// 1897 1898JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1899{ 1900 JVMWrapper("JVM_GetClassConstantPool"); 1901 JvmtiVMObjectAllocEventCollector oam; 1902 1903 // Return null for primitives and arrays 1904 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1905 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1906 if (k->oop_is_instance()) { 1907 instanceKlassHandle k_h(THREAD, k); 1908 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL); 1909 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1910 return JNIHandles::make_local(jcp()); 1911 } 1912 } 1913 return NULL; 1914} 1915JVM_END 1916 1917 1918JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1919{ 1920 JVMWrapper("JVM_ConstantPoolGetSize"); 1921 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1922 return cp->length(); 1923} 1924JVM_END 1925 1926 1927JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1928{ 1929 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1930 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1931 bounds_check(cp, index, CHECK_NULL); 1932 constantTag tag = cp->tag_at(index); 1933 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1934 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1935 } 1936 Klass* k = cp->klass_at(index, CHECK_NULL); 1937 return (jclass) JNIHandles::make_local(k->java_mirror()); 1938} 1939JVM_END 1940 1941JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1942{ 1943 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1944 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1945 bounds_check(cp, index, CHECK_NULL); 1946 constantTag tag = cp->tag_at(index); 1947 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1948 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1949 } 1950 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1951 if (k == NULL) return NULL; 1952 return (jclass) JNIHandles::make_local(k->java_mirror()); 1953} 1954JVM_END 1955 1956static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1957 constantTag tag = cp->tag_at(index); 1958 if (!tag.is_method() && !tag.is_interface_method()) { 1959 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1960 } 1961 int klass_ref = cp->uncached_klass_ref_index_at(index); 1962 Klass* k_o; 1963 if (force_resolution) { 1964 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1965 } else { 1966 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1967 if (k_o == NULL) return NULL; 1968 } 1969 instanceKlassHandle k(THREAD, k_o); 1970 Symbol* name = cp->uncached_name_ref_at(index); 1971 Symbol* sig = cp->uncached_signature_ref_at(index); 1972 methodHandle m (THREAD, k->find_method(name, sig)); 1973 if (m.is_null()) { 1974 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1975 } 1976 oop method; 1977 if (!m->is_initializer() || m->is_static()) { 1978 method = Reflection::new_method(m, true, CHECK_NULL); 1979 } else { 1980 method = Reflection::new_constructor(m, CHECK_NULL); 1981 } 1982 return JNIHandles::make_local(method); 1983} 1984 1985JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1986{ 1987 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1988 JvmtiVMObjectAllocEventCollector oam; 1989 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1990 bounds_check(cp, index, CHECK_NULL); 1991 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1992 return res; 1993} 1994JVM_END 1995 1996JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1997{ 1998 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 1999 JvmtiVMObjectAllocEventCollector oam; 2000 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2001 bounds_check(cp, index, CHECK_NULL); 2002 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2003 return res; 2004} 2005JVM_END 2006 2007static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2008 constantTag tag = cp->tag_at(index); 2009 if (!tag.is_field()) { 2010 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2011 } 2012 int klass_ref = cp->uncached_klass_ref_index_at(index); 2013 Klass* k_o; 2014 if (force_resolution) { 2015 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2016 } else { 2017 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2018 if (k_o == NULL) return NULL; 2019 } 2020 instanceKlassHandle k(THREAD, k_o); 2021 Symbol* name = cp->uncached_name_ref_at(index); 2022 Symbol* sig = cp->uncached_signature_ref_at(index); 2023 fieldDescriptor fd; 2024 Klass* target_klass = k->find_field(name, sig, &fd); 2025 if (target_klass == NULL) { 2026 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2027 } 2028 oop field = Reflection::new_field(&fd, CHECK_NULL); 2029 return JNIHandles::make_local(field); 2030} 2031 2032JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2033{ 2034 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2035 JvmtiVMObjectAllocEventCollector oam; 2036 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2037 bounds_check(cp, index, CHECK_NULL); 2038 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2039 return res; 2040} 2041JVM_END 2042 2043JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2044{ 2045 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2046 JvmtiVMObjectAllocEventCollector oam; 2047 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2048 bounds_check(cp, index, CHECK_NULL); 2049 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2050 return res; 2051} 2052JVM_END 2053 2054JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2055{ 2056 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2057 JvmtiVMObjectAllocEventCollector oam; 2058 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2059 bounds_check(cp, index, CHECK_NULL); 2060 constantTag tag = cp->tag_at(index); 2061 if (!tag.is_field_or_method()) { 2062 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2063 } 2064 int klass_ref = cp->uncached_klass_ref_index_at(index); 2065 Symbol* klass_name = cp->klass_name_at(klass_ref); 2066 Symbol* member_name = cp->uncached_name_ref_at(index); 2067 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2068 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2069 objArrayHandle dest(THREAD, dest_o); 2070 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2071 dest->obj_at_put(0, str()); 2072 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2073 dest->obj_at_put(1, str()); 2074 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2075 dest->obj_at_put(2, str()); 2076 return (jobjectArray) JNIHandles::make_local(dest()); 2077} 2078JVM_END 2079 2080JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2081{ 2082 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2083 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2084 bounds_check(cp, index, CHECK_0); 2085 constantTag tag = cp->tag_at(index); 2086 if (!tag.is_int()) { 2087 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2088 } 2089 return cp->int_at(index); 2090} 2091JVM_END 2092 2093JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2094{ 2095 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2096 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2097 bounds_check(cp, index, CHECK_(0L)); 2098 constantTag tag = cp->tag_at(index); 2099 if (!tag.is_long()) { 2100 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2101 } 2102 return cp->long_at(index); 2103} 2104JVM_END 2105 2106JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2107{ 2108 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2109 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2110 bounds_check(cp, index, CHECK_(0.0f)); 2111 constantTag tag = cp->tag_at(index); 2112 if (!tag.is_float()) { 2113 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2114 } 2115 return cp->float_at(index); 2116} 2117JVM_END 2118 2119JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2120{ 2121 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2122 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2123 bounds_check(cp, index, CHECK_(0.0)); 2124 constantTag tag = cp->tag_at(index); 2125 if (!tag.is_double()) { 2126 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2127 } 2128 return cp->double_at(index); 2129} 2130JVM_END 2131 2132JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2133{ 2134 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2135 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2136 bounds_check(cp, index, CHECK_NULL); 2137 constantTag tag = cp->tag_at(index); 2138 if (!tag.is_string()) { 2139 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2140 } 2141 oop str = cp->string_at(index, CHECK_NULL); 2142 return (jstring) JNIHandles::make_local(str); 2143} 2144JVM_END 2145 2146JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2147{ 2148 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2149 JvmtiVMObjectAllocEventCollector oam; 2150 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2151 bounds_check(cp, index, CHECK_NULL); 2152 constantTag tag = cp->tag_at(index); 2153 if (!tag.is_symbol()) { 2154 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2155 } 2156 Symbol* sym = cp->symbol_at(index); 2157 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2158 return (jstring) JNIHandles::make_local(str()); 2159} 2160JVM_END 2161 2162 2163// Assertion support. ////////////////////////////////////////////////////////// 2164 2165JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2166 JVMWrapper("JVM_DesiredAssertionStatus"); 2167 assert(cls != NULL, "bad class"); 2168 2169 oop r = JNIHandles::resolve(cls); 2170 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2171 if (java_lang_Class::is_primitive(r)) return false; 2172 2173 Klass* k = java_lang_Class::as_Klass(r); 2174 assert(k->oop_is_instance(), "must be an instance klass"); 2175 if (! k->oop_is_instance()) return false; 2176 2177 ResourceMark rm(THREAD); 2178 const char* name = k->name()->as_C_string(); 2179 bool system_class = k->class_loader() == NULL; 2180 return JavaAssertions::enabled(name, system_class); 2181 2182JVM_END 2183 2184 2185// Return a new AssertionStatusDirectives object with the fields filled in with 2186// command-line assertion arguments (i.e., -ea, -da). 2187JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2188 JVMWrapper("JVM_AssertionStatusDirectives"); 2189 JvmtiVMObjectAllocEventCollector oam; 2190 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2191 return JNIHandles::make_local(env, asd); 2192JVM_END 2193 2194// Verification //////////////////////////////////////////////////////////////////////////////// 2195 2196// Reflection for the verifier ///////////////////////////////////////////////////////////////// 2197 2198// RedefineClasses support: bug 6214132 caused verification to fail. 2199// All functions from this section should call the jvmtiThreadSate function: 2200// Klass* class_to_verify_considering_redefinition(Klass* klass). 2201// The function returns a Klass* of the _scratch_class if the verifier 2202// was invoked in the middle of the class redefinition. 2203// Otherwise it returns its argument value which is the _the_class Klass*. 2204// Please, refer to the description in the jvmtiThreadSate.hpp. 2205 2206JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2207 JVMWrapper("JVM_GetClassNameUTF"); 2208 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2209 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2210 return k->name()->as_utf8(); 2211JVM_END 2212 2213 2214JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2215 JVMWrapper("JVM_GetClassCPTypes"); 2216 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2217 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2218 // types will have length zero if this is not an InstanceKlass 2219 // (length is determined by call to JVM_GetClassCPEntriesCount) 2220 if (k->oop_is_instance()) { 2221 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2222 for (int index = cp->length() - 1; index >= 0; index--) { 2223 constantTag tag = cp->tag_at(index); 2224 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2225 } 2226 } 2227JVM_END 2228 2229 2230JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2231 JVMWrapper("JVM_GetClassCPEntriesCount"); 2232 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2233 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2234 if (!k->oop_is_instance()) 2235 return 0; 2236 return InstanceKlass::cast(k)->constants()->length(); 2237JVM_END 2238 2239 2240JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2241 JVMWrapper("JVM_GetClassFieldsCount"); 2242 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2243 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2244 if (!k->oop_is_instance()) 2245 return 0; 2246 return InstanceKlass::cast(k)->java_fields_count(); 2247JVM_END 2248 2249 2250JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2251 JVMWrapper("JVM_GetClassMethodsCount"); 2252 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2253 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2254 if (!k->oop_is_instance()) 2255 return 0; 2256 return InstanceKlass::cast(k)->methods()->length(); 2257JVM_END 2258 2259 2260// The following methods, used for the verifier, are never called with 2261// array klasses, so a direct cast to InstanceKlass is safe. 2262// Typically, these methods are called in a loop with bounds determined 2263// by the results of JVM_GetClass{Fields,Methods}Count, which return 2264// zero for arrays. 2265JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2266 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2267 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2268 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2269 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2270 int length = method->checked_exceptions_length(); 2271 if (length > 0) { 2272 CheckedExceptionElement* table= method->checked_exceptions_start(); 2273 for (int i = 0; i < length; i++) { 2274 exceptions[i] = table[i].class_cp_index; 2275 } 2276 } 2277JVM_END 2278 2279 2280JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2281 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2282 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2283 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2284 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2285 return method->checked_exceptions_length(); 2286JVM_END 2287 2288 2289JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2290 JVMWrapper("JVM_GetMethodIxByteCode"); 2291 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2292 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2293 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2294 memcpy(code, method->code_base(), method->code_size()); 2295JVM_END 2296 2297 2298JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2299 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2300 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2301 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2302 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2303 return method->code_size(); 2304JVM_END 2305 2306 2307JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2308 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2309 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2310 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2311 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2312 ExceptionTable extable(method); 2313 entry->start_pc = extable.start_pc(entry_index); 2314 entry->end_pc = extable.end_pc(entry_index); 2315 entry->handler_pc = extable.handler_pc(entry_index); 2316 entry->catchType = extable.catch_type_index(entry_index); 2317JVM_END 2318 2319 2320JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2321 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2322 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2323 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2324 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2325 return method->exception_table_length(); 2326JVM_END 2327 2328 2329JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2330 JVMWrapper("JVM_GetMethodIxModifiers"); 2331 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2332 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2333 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2334 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2335JVM_END 2336 2337 2338JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2339 JVMWrapper("JVM_GetFieldIxModifiers"); 2340 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2341 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2342 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2343JVM_END 2344 2345 2346JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2347 JVMWrapper("JVM_GetMethodIxLocalsCount"); 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->max_locals(); 2352JVM_END 2353 2354 2355JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2356 JVMWrapper("JVM_GetMethodIxArgsSize"); 2357 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2358 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2359 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2360 return method->size_of_parameters(); 2361JVM_END 2362 2363 2364JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2365 JVMWrapper("JVM_GetMethodIxMaxStack"); 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->verifier_max_stack(); 2370JVM_END 2371 2372 2373JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2374 JVMWrapper("JVM_IsConstructorIx"); 2375 ResourceMark rm(THREAD); 2376 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2377 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2378 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2379 return method->name() == vmSymbols::object_initializer_name(); 2380JVM_END 2381 2382 2383JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2384 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2385 ResourceMark rm(THREAD); 2386 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2387 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2388 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2389 return method->is_overpass(); 2390JVM_END 2391 2392JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2393 JVMWrapper("JVM_GetMethodIxIxUTF"); 2394 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2395 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2396 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2397 return method->name()->as_utf8(); 2398JVM_END 2399 2400 2401JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2402 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2403 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2404 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2405 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2406 return method->signature()->as_utf8(); 2407JVM_END 2408 2409/** 2410 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2411 * read entries in the constant pool. Since the old verifier always 2412 * works on a copy of the code, it will not see any rewriting that 2413 * may possibly occur in the middle of verification. So it is important 2414 * that nothing it calls tries to use the cpCache instead of the raw 2415 * constant pool, so we must use cp->uncached_x methods when appropriate. 2416 */ 2417JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2418 JVMWrapper("JVM_GetCPFieldNameUTF"); 2419 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2420 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2421 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2422 switch (cp->tag_at(cp_index).value()) { 2423 case JVM_CONSTANT_Fieldref: 2424 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2425 default: 2426 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2427 } 2428 ShouldNotReachHere(); 2429 return NULL; 2430JVM_END 2431 2432 2433JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2434 JVMWrapper("JVM_GetCPMethodNameUTF"); 2435 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2436 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2437 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2438 switch (cp->tag_at(cp_index).value()) { 2439 case JVM_CONSTANT_InterfaceMethodref: 2440 case JVM_CONSTANT_Methodref: 2441 case JVM_CONSTANT_NameAndType: // for invokedynamic 2442 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2443 default: 2444 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2445 } 2446 ShouldNotReachHere(); 2447 return NULL; 2448JVM_END 2449 2450 2451JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2452 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2453 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2454 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2455 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2456 switch (cp->tag_at(cp_index).value()) { 2457 case JVM_CONSTANT_InterfaceMethodref: 2458 case JVM_CONSTANT_Methodref: 2459 case JVM_CONSTANT_NameAndType: // for invokedynamic 2460 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2461 default: 2462 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2463 } 2464 ShouldNotReachHere(); 2465 return NULL; 2466JVM_END 2467 2468 2469JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2470 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2471 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2472 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2473 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2474 switch (cp->tag_at(cp_index).value()) { 2475 case JVM_CONSTANT_Fieldref: 2476 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2477 default: 2478 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2479 } 2480 ShouldNotReachHere(); 2481 return NULL; 2482JVM_END 2483 2484 2485JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2486 JVMWrapper("JVM_GetCPClassNameUTF"); 2487 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2488 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2489 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2490 Symbol* classname = cp->klass_name_at(cp_index); 2491 return classname->as_utf8(); 2492JVM_END 2493 2494 2495JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2496 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2497 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2498 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2499 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2500 switch (cp->tag_at(cp_index).value()) { 2501 case JVM_CONSTANT_Fieldref: { 2502 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2503 Symbol* classname = cp->klass_name_at(class_index); 2504 return classname->as_utf8(); 2505 } 2506 default: 2507 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2508 } 2509 ShouldNotReachHere(); 2510 return NULL; 2511JVM_END 2512 2513 2514JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2515 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2516 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2517 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2518 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2519 switch (cp->tag_at(cp_index).value()) { 2520 case JVM_CONSTANT_Methodref: 2521 case JVM_CONSTANT_InterfaceMethodref: { 2522 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2523 Symbol* classname = cp->klass_name_at(class_index); 2524 return classname->as_utf8(); 2525 } 2526 default: 2527 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2528 } 2529 ShouldNotReachHere(); 2530 return NULL; 2531JVM_END 2532 2533 2534JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2535 JVMWrapper("JVM_GetCPFieldModifiers"); 2536 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2537 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2538 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2539 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2540 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2541 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2542 switch (cp->tag_at(cp_index).value()) { 2543 case JVM_CONSTANT_Fieldref: { 2544 Symbol* name = cp->uncached_name_ref_at(cp_index); 2545 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2546 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) { 2547 if (fs.name() == name && fs.signature() == signature) { 2548 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2549 } 2550 } 2551 return -1; 2552 } 2553 default: 2554 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2555 } 2556 ShouldNotReachHere(); 2557 return 0; 2558JVM_END 2559 2560 2561JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2562 JVMWrapper("JVM_GetCPMethodModifiers"); 2563 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2564 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2565 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2566 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2567 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2568 switch (cp->tag_at(cp_index).value()) { 2569 case JVM_CONSTANT_Methodref: 2570 case JVM_CONSTANT_InterfaceMethodref: { 2571 Symbol* name = cp->uncached_name_ref_at(cp_index); 2572 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2573 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2574 int methods_count = methods->length(); 2575 for (int i = 0; i < methods_count; i++) { 2576 Method* method = methods->at(i); 2577 if (method->name() == name && method->signature() == signature) { 2578 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2579 } 2580 } 2581 return -1; 2582 } 2583 default: 2584 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2585 } 2586 ShouldNotReachHere(); 2587 return 0; 2588JVM_END 2589 2590 2591// Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2592 2593JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2594 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2595JVM_END 2596 2597 2598JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2599 JVMWrapper("JVM_IsSameClassPackage"); 2600 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2601 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2602 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2603 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2604 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2605JVM_END 2606 2607// Printing support ////////////////////////////////////////////////// 2608extern "C" { 2609 2610ATTRIBUTE_PRINTF(3, 0) 2611int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2612 // see bug 4399518, 4417214 2613 if ((intptr_t)count <= 0) return -1; 2614 2615 int result = vsnprintf(str, count, fmt, args); 2616 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2617 // characters which would have been written had the buffer been large 2618 // enough; on Windows, it returns -1. We handle both cases here and 2619 // always return -1, and perform null termination. 2620 if ((result > 0 && (size_t)result >= count) || result == -1) { 2621 str[count - 1] = '\0'; 2622 result = -1; 2623 } 2624 2625 return result; 2626} 2627 2628ATTRIBUTE_PRINTF(3, 0) 2629int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2630 va_list args; 2631 int len; 2632 va_start(args, fmt); 2633 len = jio_vsnprintf(str, count, fmt, args); 2634 va_end(args); 2635 return len; 2636} 2637 2638ATTRIBUTE_PRINTF(2,3) 2639int jio_fprintf(FILE* f, const char *fmt, ...) { 2640 int len; 2641 va_list args; 2642 va_start(args, fmt); 2643 len = jio_vfprintf(f, fmt, args); 2644 va_end(args); 2645 return len; 2646} 2647 2648ATTRIBUTE_PRINTF(2, 0) 2649int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2650 if (Arguments::vfprintf_hook() != NULL) { 2651 return Arguments::vfprintf_hook()(f, fmt, args); 2652 } else { 2653 return vfprintf(f, fmt, args); 2654 } 2655} 2656 2657ATTRIBUTE_PRINTF(1, 2) 2658JNIEXPORT int jio_printf(const char *fmt, ...) { 2659 int len; 2660 va_list args; 2661 va_start(args, fmt); 2662 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2663 va_end(args); 2664 return len; 2665} 2666 2667 2668// HotSpot specific jio method 2669void jio_print(const char* s) { 2670 // Try to make this function as atomic as possible. 2671 if (Arguments::vfprintf_hook() != NULL) { 2672 jio_fprintf(defaultStream::output_stream(), "%s", s); 2673 } else { 2674 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2675 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2676 } 2677} 2678 2679} // Extern C 2680 2681// java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2682 2683// In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 2684// to prevent the target thread from exiting after we have a pointer to the C++ Thread or 2685// OSThread objects. The exception to this rule is when the target object is the thread 2686// doing the operation, in which case we know that the thread won't exit until the 2687// operation is done (all exits being voluntary). There are a few cases where it is 2688// rather silly to do operations on yourself, like resuming yourself or asking whether 2689// you are alive. While these can still happen, they are not subject to deadlocks if 2690// the lock is held while the operation occurs (this is not the case for suspend, for 2691// instance), and are very unlikely. Because IsAlive needs to be fast and its 2692// implementation is local to this file, we always lock Threads_lock for that one. 2693 2694static void thread_entry(JavaThread* thread, TRAPS) { 2695 HandleMark hm(THREAD); 2696 Handle obj(THREAD, thread->threadObj()); 2697 JavaValue result(T_VOID); 2698 JavaCalls::call_virtual(&result, 2699 obj, 2700 KlassHandle(THREAD, SystemDictionary::Thread_klass()), 2701 vmSymbols::run_method_name(), 2702 vmSymbols::void_method_signature(), 2703 THREAD); 2704} 2705 2706 2707JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2708 JVMWrapper("JVM_StartThread"); 2709 JavaThread *native_thread = NULL; 2710 2711 // We cannot hold the Threads_lock when we throw an exception, 2712 // due to rank ordering issues. Example: we might need to grab the 2713 // Heap_lock while we construct the exception. 2714 bool throw_illegal_thread_state = false; 2715 2716 // We must release the Threads_lock before we can post a jvmti event 2717 // in Thread::start. 2718 { 2719 // Ensure that the C++ Thread and OSThread structures aren't freed before 2720 // we operate. 2721 MutexLocker mu(Threads_lock); 2722 2723 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2724 // re-starting an already started thread, so we should usually find 2725 // that the JavaThread is null. However for a JNI attached thread 2726 // there is a small window between the Thread object being created 2727 // (with its JavaThread set) and the update to its threadStatus, so we 2728 // have to check for this 2729 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2730 throw_illegal_thread_state = true; 2731 } else { 2732 // We could also check the stillborn flag to see if this thread was already stopped, but 2733 // for historical reasons we let the thread detect that itself when it starts running 2734 2735 jlong size = 2736 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2737 // Allocate the C++ Thread structure and create the native thread. The 2738 // stack size retrieved from java is signed, but the constructor takes 2739 // size_t (an unsigned type), so avoid passing negative values which would 2740 // result in really large stacks. 2741 size_t sz = size > 0 ? (size_t) size : 0; 2742 native_thread = new JavaThread(&thread_entry, sz); 2743 2744 // At this point it may be possible that no osthread was created for the 2745 // JavaThread due to lack of memory. Check for this situation and throw 2746 // an exception if necessary. Eventually we may want to change this so 2747 // that we only grab the lock if the thread was created successfully - 2748 // then we can also do this check and throw the exception in the 2749 // JavaThread constructor. 2750 if (native_thread->osthread() != NULL) { 2751 // Note: the current thread is not being used within "prepare". 2752 native_thread->prepare(jthread); 2753 } 2754 } 2755 } 2756 2757 if (throw_illegal_thread_state) { 2758 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2759 } 2760 2761 assert(native_thread != NULL, "Starting null thread?"); 2762 2763 if (native_thread->osthread() == NULL) { 2764 // No one should hold a reference to the 'native_thread'. 2765 delete native_thread; 2766 if (JvmtiExport::should_post_resource_exhausted()) { 2767 JvmtiExport::post_resource_exhausted( 2768 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2769 os::native_thread_creation_failed_msg()); 2770 } 2771 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2772 os::native_thread_creation_failed_msg()); 2773 } 2774 2775 Thread::start(native_thread); 2776 2777JVM_END 2778 2779// JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2780// before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2781// but is thought to be reliable and simple. In the case, where the receiver is the 2782// same thread as the sender, no safepoint is needed. 2783JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2784 JVMWrapper("JVM_StopThread"); 2785 2786 oop java_throwable = JNIHandles::resolve(throwable); 2787 if (java_throwable == NULL) { 2788 THROW(vmSymbols::java_lang_NullPointerException()); 2789 } 2790 oop java_thread = JNIHandles::resolve_non_null(jthread); 2791 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2792 Events::log_exception(JavaThread::current(), 2793 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2794 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2795 // First check if thread is alive 2796 if (receiver != NULL) { 2797 // Check if exception is getting thrown at self (use oop equality, since the 2798 // target object might exit) 2799 if (java_thread == thread->threadObj()) { 2800 THROW_OOP(java_throwable); 2801 } else { 2802 // Enques a VM_Operation to stop all threads and then deliver the exception... 2803 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 2804 } 2805 } 2806 else { 2807 // Either: 2808 // - target thread has not been started before being stopped, or 2809 // - target thread already terminated 2810 // We could read the threadStatus to determine which case it is 2811 // but that is overkill as it doesn't matter. We must set the 2812 // stillborn flag for the first case, and if the thread has already 2813 // exited setting this flag has no affect 2814 java_lang_Thread::set_stillborn(java_thread); 2815 } 2816JVM_END 2817 2818 2819JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2820 JVMWrapper("JVM_IsThreadAlive"); 2821 2822 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2823 return java_lang_Thread::is_alive(thread_oop); 2824JVM_END 2825 2826 2827JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2828 JVMWrapper("JVM_SuspendThread"); 2829 oop java_thread = JNIHandles::resolve_non_null(jthread); 2830 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2831 2832 if (receiver != NULL) { 2833 // thread has run and has not exited (still on threads list) 2834 2835 { 2836 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2837 if (receiver->is_external_suspend()) { 2838 // Don't allow nested external suspend requests. We can't return 2839 // an error from this interface so just ignore the problem. 2840 return; 2841 } 2842 if (receiver->is_exiting()) { // thread is in the process of exiting 2843 return; 2844 } 2845 receiver->set_external_suspend(); 2846 } 2847 2848 // java_suspend() will catch threads in the process of exiting 2849 // and will ignore them. 2850 receiver->java_suspend(); 2851 2852 // It would be nice to have the following assertion in all the 2853 // time, but it is possible for a racing resume request to have 2854 // resumed this thread right after we suspended it. Temporarily 2855 // enable this assertion if you are chasing a different kind of 2856 // bug. 2857 // 2858 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2859 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2860 } 2861JVM_END 2862 2863 2864JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2865 JVMWrapper("JVM_ResumeThread"); 2866 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 2867 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2868 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2869 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2870 // looks at it. 2871 MutexLocker ml(Threads_lock); 2872 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2873 if (thr != NULL) { 2874 // the thread has run and is not in the process of exiting 2875 thr->java_resume(); 2876 } 2877JVM_END 2878 2879 2880JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2881 JVMWrapper("JVM_SetThreadPriority"); 2882 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2883 MutexLocker ml(Threads_lock); 2884 oop java_thread = JNIHandles::resolve_non_null(jthread); 2885 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2886 JavaThread* thr = java_lang_Thread::thread(java_thread); 2887 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 2888 Thread::set_priority(thr, (ThreadPriority)prio); 2889 } 2890JVM_END 2891 2892 2893JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2894 JVMWrapper("JVM_Yield"); 2895 if (os::dont_yield()) return; 2896 HOTSPOT_THREAD_YIELD(); 2897 2898 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield. 2899 // Critical for similar threading behaviour 2900 if (ConvertYieldToSleep) { 2901 os::sleep(thread, MinSleepInterval, false); 2902 } else { 2903 os::naked_yield(); 2904 } 2905JVM_END 2906 2907 2908JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2909 JVMWrapper("JVM_Sleep"); 2910 2911 if (millis < 0) { 2912 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2913 } 2914 2915 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2916 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2917 } 2918 2919 // Save current thread state and restore it at the end of this block. 2920 // And set new thread state to SLEEPING. 2921 JavaThreadSleepState jtss(thread); 2922 2923 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 2924 2925 EventThreadSleep event; 2926 2927 if (millis == 0) { 2928 // When ConvertSleepToYield is on, this matches the classic VM implementation of 2929 // JVM_Sleep. Critical for similar threading behaviour (Win32) 2930 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep 2931 // for SOLARIS 2932 if (ConvertSleepToYield) { 2933 os::naked_yield(); 2934 } else { 2935 ThreadState old_state = thread->osthread()->get_state(); 2936 thread->osthread()->set_state(SLEEPING); 2937 os::sleep(thread, MinSleepInterval, false); 2938 thread->osthread()->set_state(old_state); 2939 } 2940 } else { 2941 ThreadState old_state = thread->osthread()->get_state(); 2942 thread->osthread()->set_state(SLEEPING); 2943 if (os::sleep(thread, millis, true) == OS_INTRPT) { 2944 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 2945 // us while we were sleeping. We do not overwrite those. 2946 if (!HAS_PENDING_EXCEPTION) { 2947 if (event.should_commit()) { 2948 event.set_time(millis); 2949 event.commit(); 2950 } 2951 HOTSPOT_THREAD_SLEEP_END(1); 2952 2953 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 2954 // to properly restore the thread state. That's likely wrong. 2955 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2956 } 2957 } 2958 thread->osthread()->set_state(old_state); 2959 } 2960 if (event.should_commit()) { 2961 event.set_time(millis); 2962 event.commit(); 2963 } 2964 HOTSPOT_THREAD_SLEEP_END(0); 2965JVM_END 2966 2967JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 2968 JVMWrapper("JVM_CurrentThread"); 2969 oop jthread = thread->threadObj(); 2970 assert (thread != NULL, "no current thread!"); 2971 return JNIHandles::make_local(env, jthread); 2972JVM_END 2973 2974 2975JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 2976 JVMWrapper("JVM_CountStackFrames"); 2977 2978 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2979 oop java_thread = JNIHandles::resolve_non_null(jthread); 2980 bool throw_illegal_thread_state = false; 2981 int count = 0; 2982 2983 { 2984 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 2985 // We need to re-resolve the java_thread, since a GC might have happened during the 2986 // acquire of the lock 2987 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2988 2989 if (thr == NULL) { 2990 // do nothing 2991 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 2992 // Check whether this java thread has been suspended already. If not, throws 2993 // IllegalThreadStateException. We defer to throw that exception until 2994 // Threads_lock is released since loading exception class has to leave VM. 2995 // The correct way to test a thread is actually suspended is 2996 // wait_for_ext_suspend_completion(), but we can't call that while holding 2997 // the Threads_lock. The above tests are sufficient for our purposes 2998 // provided the walkability of the stack is stable - which it isn't 2999 // 100% but close enough for most practical purposes. 3000 throw_illegal_thread_state = true; 3001 } else { 3002 // Count all java activation, i.e., number of vframes 3003 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 3004 // Native frames are not counted 3005 if (!vfst.method()->is_native()) count++; 3006 } 3007 } 3008 } 3009 3010 if (throw_illegal_thread_state) { 3011 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3012 "this thread is not suspended"); 3013 } 3014 return count; 3015JVM_END 3016 3017// Consider: A better way to implement JVM_Interrupt() is to acquire 3018// Threads_lock to resolve the jthread into a Thread pointer, fetch 3019// Thread->platformevent, Thread->native_thr, Thread->parker, etc., 3020// drop Threads_lock, and the perform the unpark() and thr_kill() operations 3021// outside the critical section. Threads_lock is hot so we want to minimize 3022// the hold-time. A cleaner interface would be to decompose interrupt into 3023// two steps. The 1st phase, performed under Threads_lock, would return 3024// a closure that'd be invoked after Threads_lock was dropped. 3025// This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 3026// admit spurious wakeups. 3027 3028JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3029 JVMWrapper("JVM_Interrupt"); 3030 3031 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3032 oop java_thread = JNIHandles::resolve_non_null(jthread); 3033 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3034 // We need to re-resolve the java_thread, since a GC might have happened during the 3035 // acquire of the lock 3036 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3037 if (thr != NULL) { 3038 Thread::interrupt(thr); 3039 } 3040JVM_END 3041 3042 3043JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3044 JVMWrapper("JVM_IsInterrupted"); 3045 3046 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3047 oop java_thread = JNIHandles::resolve_non_null(jthread); 3048 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3049 // We need to re-resolve the java_thread, since a GC might have happened during the 3050 // acquire of the lock 3051 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3052 if (thr == NULL) { 3053 return JNI_FALSE; 3054 } else { 3055 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3056 } 3057JVM_END 3058 3059 3060// Return true iff the current thread has locked the object passed in 3061 3062JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3063 JVMWrapper("JVM_HoldsLock"); 3064 assert(THREAD->is_Java_thread(), "sanity check"); 3065 if (obj == NULL) { 3066 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3067 } 3068 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3069 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3070JVM_END 3071 3072 3073JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3074 JVMWrapper("JVM_DumpAllStacks"); 3075 VM_PrintThreads op; 3076 VMThread::execute(&op); 3077 if (JvmtiExport::should_post_data_dump()) { 3078 JvmtiExport::post_data_dump(); 3079 } 3080JVM_END 3081 3082JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3083 JVMWrapper("JVM_SetNativeThreadName"); 3084 ResourceMark rm(THREAD); 3085 oop java_thread = JNIHandles::resolve_non_null(jthread); 3086 JavaThread* thr = java_lang_Thread::thread(java_thread); 3087 // Thread naming only supported for the current thread, doesn't work for 3088 // target threads. 3089 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3090 // we don't set the name of an attached thread to avoid stepping 3091 // on other programs 3092 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3093 os::set_native_thread_name(thread_name); 3094 } 3095JVM_END 3096 3097// java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3098 3099static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3100 assert(jthread->is_Java_thread(), "must be a Java thread"); 3101 if (jthread->privileged_stack_top() == NULL) return false; 3102 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3103 oop loader = jthread->privileged_stack_top()->class_loader(); 3104 if (loader == NULL) return true; 3105 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3106 if (trusted) return true; 3107 } 3108 return false; 3109} 3110 3111JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3112 JVMWrapper("JVM_CurrentLoadedClass"); 3113 ResourceMark rm(THREAD); 3114 3115 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3116 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3117 bool trusted = is_trusted_frame(thread, &vfst); 3118 if (trusted) return NULL; 3119 3120 Method* m = vfst.method(); 3121 if (!m->is_native()) { 3122 InstanceKlass* holder = m->method_holder(); 3123 oop loader = holder->class_loader(); 3124 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3125 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3126 } 3127 } 3128 } 3129 return NULL; 3130JVM_END 3131 3132 3133JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3134 JVMWrapper("JVM_CurrentClassLoader"); 3135 ResourceMark rm(THREAD); 3136 3137 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3138 3139 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3140 bool trusted = is_trusted_frame(thread, &vfst); 3141 if (trusted) return NULL; 3142 3143 Method* m = vfst.method(); 3144 if (!m->is_native()) { 3145 InstanceKlass* holder = m->method_holder(); 3146 assert(holder->is_klass(), "just checking"); 3147 oop loader = holder->class_loader(); 3148 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3149 return JNIHandles::make_local(env, loader); 3150 } 3151 } 3152 } 3153 return NULL; 3154JVM_END 3155 3156 3157JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3158 JVMWrapper("JVM_GetClassContext"); 3159 ResourceMark rm(THREAD); 3160 JvmtiVMObjectAllocEventCollector oam; 3161 vframeStream vfst(thread); 3162 3163 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3164 // This must only be called from SecurityManager.getClassContext 3165 Method* m = vfst.method(); 3166 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3167 m->name() == vmSymbols::getClassContext_name() && 3168 m->signature() == vmSymbols::void_class_array_signature())) { 3169 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3170 } 3171 } 3172 3173 // Collect method holders 3174 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>(); 3175 for (; !vfst.at_end(); vfst.security_next()) { 3176 Method* m = vfst.method(); 3177 // Native frames are not returned 3178 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3179 Klass* holder = m->method_holder(); 3180 assert(holder->is_klass(), "just checking"); 3181 klass_array->append(holder); 3182 } 3183 } 3184 3185 // Create result array of type [Ljava/lang/Class; 3186 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3187 // Fill in mirrors corresponding to method holders 3188 for (int i = 0; i < klass_array->length(); i++) { 3189 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3190 } 3191 3192 return (jobjectArray) JNIHandles::make_local(env, result); 3193JVM_END 3194 3195 3196JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3197 JVMWrapper("JVM_ClassDepth"); 3198 ResourceMark rm(THREAD); 3199 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3200 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3201 3202 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3203 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3204 if (class_name_sym == NULL) { 3205 return -1; 3206 } 3207 3208 int depth = 0; 3209 3210 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3211 if (!vfst.method()->is_native()) { 3212 InstanceKlass* holder = vfst.method()->method_holder(); 3213 assert(holder->is_klass(), "just checking"); 3214 if (holder->name() == class_name_sym) { 3215 return depth; 3216 } 3217 depth++; 3218 } 3219 } 3220 return -1; 3221JVM_END 3222 3223 3224JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3225 JVMWrapper("JVM_ClassLoaderDepth"); 3226 ResourceMark rm(THREAD); 3227 int depth = 0; 3228 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3229 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3230 bool trusted = is_trusted_frame(thread, &vfst); 3231 if (trusted) return -1; 3232 3233 Method* m = vfst.method(); 3234 if (!m->is_native()) { 3235 InstanceKlass* holder = m->method_holder(); 3236 assert(holder->is_klass(), "just checking"); 3237 oop loader = holder->class_loader(); 3238 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3239 return depth; 3240 } 3241 depth++; 3242 } 3243 } 3244 return -1; 3245JVM_END 3246 3247 3248// java.lang.Package //////////////////////////////////////////////////////////////// 3249 3250 3251JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3252 JVMWrapper("JVM_GetSystemPackage"); 3253 ResourceMark rm(THREAD); 3254 JvmtiVMObjectAllocEventCollector oam; 3255 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3256 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3257 return (jstring) JNIHandles::make_local(result); 3258JVM_END 3259 3260 3261JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3262 JVMWrapper("JVM_GetSystemPackages"); 3263 JvmtiVMObjectAllocEventCollector oam; 3264 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3265 return (jobjectArray) JNIHandles::make_local(result); 3266JVM_END 3267 3268 3269// ObjectInputStream /////////////////////////////////////////////////////////////// 3270 3271bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3272 if (current_class == NULL) { 3273 return true; 3274 } 3275 if ((current_class == field_class) || access.is_public()) { 3276 return true; 3277 } 3278 3279 if (access.is_protected()) { 3280 // See if current_class is a subclass of field_class 3281 if (current_class->is_subclass_of(field_class)) { 3282 return true; 3283 } 3284 } 3285 3286 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3287} 3288 3289// Return the first non-null class loader up the execution stack, or null 3290// if only code from the null class loader is on the stack. 3291 3292JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3293 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3294 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3295 oop loader = vfst.method()->method_holder()->class_loader(); 3296 if (loader != NULL) { 3297 return JNIHandles::make_local(env, loader); 3298 } 3299 } 3300 return NULL; 3301JVM_END 3302 3303 3304// Array /////////////////////////////////////////////////////////////////////////////////////////// 3305 3306 3307// resolve array handle and check arguments 3308static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3309 if (arr == NULL) { 3310 THROW_0(vmSymbols::java_lang_NullPointerException()); 3311 } 3312 oop a = JNIHandles::resolve_non_null(arr); 3313 if (!a->is_array()) { 3314 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3315 } else if (type_array_only && !a->is_typeArray()) { 3316 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3317 } 3318 return arrayOop(a); 3319} 3320 3321 3322JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3323 JVMWrapper("JVM_GetArrayLength"); 3324 arrayOop a = check_array(env, arr, false, CHECK_0); 3325 return a->length(); 3326JVM_END 3327 3328 3329JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3330 JVMWrapper("JVM_Array_Get"); 3331 JvmtiVMObjectAllocEventCollector oam; 3332 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3333 jvalue value; 3334 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3335 oop box = Reflection::box(&value, type, CHECK_NULL); 3336 return JNIHandles::make_local(env, box); 3337JVM_END 3338 3339 3340JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3341 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3342 jvalue value; 3343 value.i = 0; // to initialize value before getting used in CHECK 3344 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3345 assert(a->is_typeArray(), "just checking"); 3346 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3347 BasicType wide_type = (BasicType) wCode; 3348 if (type != wide_type) { 3349 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3350 } 3351 return value; 3352JVM_END 3353 3354 3355JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3356 JVMWrapper("JVM_SetArrayElement"); 3357 arrayOop a = check_array(env, arr, false, CHECK); 3358 oop box = JNIHandles::resolve(val); 3359 jvalue value; 3360 value.i = 0; // to initialize value before getting used in CHECK 3361 BasicType value_type; 3362 if (a->is_objArray()) { 3363 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3364 value_type = Reflection::unbox_for_regular_object(box, &value); 3365 } else { 3366 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3367 } 3368 Reflection::array_set(&value, a, index, value_type, CHECK); 3369JVM_END 3370 3371 3372JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3373 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3374 arrayOop a = check_array(env, arr, true, CHECK); 3375 assert(a->is_typeArray(), "just checking"); 3376 BasicType value_type = (BasicType) vCode; 3377 Reflection::array_set(&v, a, index, value_type, CHECK); 3378JVM_END 3379 3380 3381JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3382 JVMWrapper("JVM_NewArray"); 3383 JvmtiVMObjectAllocEventCollector oam; 3384 oop element_mirror = JNIHandles::resolve(eltClass); 3385 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3386 return JNIHandles::make_local(env, result); 3387JVM_END 3388 3389 3390JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3391 JVMWrapper("JVM_NewMultiArray"); 3392 JvmtiVMObjectAllocEventCollector oam; 3393 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3394 oop element_mirror = JNIHandles::resolve(eltClass); 3395 assert(dim_array->is_typeArray(), "just checking"); 3396 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3397 return JNIHandles::make_local(env, result); 3398JVM_END 3399 3400 3401// Library support /////////////////////////////////////////////////////////////////////////// 3402 3403JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3404 //%note jvm_ct 3405 JVMWrapper2("JVM_LoadLibrary (%s)", name); 3406 char ebuf[1024]; 3407 void *load_result; 3408 { 3409 ThreadToNativeFromVM ttnfvm(thread); 3410 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3411 } 3412 if (load_result == NULL) { 3413 char msg[1024]; 3414 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3415 // Since 'ebuf' may contain a string encoded using 3416 // platform encoding scheme, we need to pass 3417 // Exceptions::unsafe_to_utf8 to the new_exception method 3418 // as the last argument. See bug 6367357. 3419 Handle h_exception = 3420 Exceptions::new_exception(thread, 3421 vmSymbols::java_lang_UnsatisfiedLinkError(), 3422 msg, Exceptions::unsafe_to_utf8); 3423 3424 THROW_HANDLE_0(h_exception); 3425 } 3426 return load_result; 3427JVM_END 3428 3429 3430JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3431 JVMWrapper("JVM_UnloadLibrary"); 3432 os::dll_unload(handle); 3433JVM_END 3434 3435 3436JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3437 JVMWrapper2("JVM_FindLibraryEntry (%s)", name); 3438 return os::dll_lookup(handle, name); 3439JVM_END 3440 3441 3442// JNI version /////////////////////////////////////////////////////////////////////////////// 3443 3444JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3445 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version); 3446 return Threads::is_supported_jni_version_including_1_1(version); 3447JVM_END 3448 3449 3450// String support /////////////////////////////////////////////////////////////////////////// 3451 3452JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3453 JVMWrapper("JVM_InternString"); 3454 JvmtiVMObjectAllocEventCollector oam; 3455 if (str == NULL) return NULL; 3456 oop string = JNIHandles::resolve_non_null(str); 3457 oop result = StringTable::intern(string, CHECK_NULL); 3458 return (jstring) JNIHandles::make_local(env, result); 3459JVM_END 3460 3461 3462// Raw monitor support ////////////////////////////////////////////////////////////////////// 3463 3464// The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3465// without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3466// they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3467// that only works with java threads. 3468 3469 3470JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3471 VM_Exit::block_if_vm_exited(); 3472 JVMWrapper("JVM_RawMonitorCreate"); 3473 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3474} 3475 3476 3477JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3478 VM_Exit::block_if_vm_exited(); 3479 JVMWrapper("JVM_RawMonitorDestroy"); 3480 delete ((Mutex*) mon); 3481} 3482 3483 3484JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3485 VM_Exit::block_if_vm_exited(); 3486 JVMWrapper("JVM_RawMonitorEnter"); 3487 ((Mutex*) mon)->jvm_raw_lock(); 3488 return 0; 3489} 3490 3491 3492JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3493 VM_Exit::block_if_vm_exited(); 3494 JVMWrapper("JVM_RawMonitorExit"); 3495 ((Mutex*) mon)->jvm_raw_unlock(); 3496} 3497 3498 3499// Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3500 3501jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3502 Handle loader, Handle protection_domain, 3503 jboolean throwError, TRAPS) { 3504 // Security Note: 3505 // The Java level wrapper will perform the necessary security check allowing 3506 // us to pass the NULL as the initiating class loader. The VM is responsible for 3507 // the checkPackageAccess relative to the initiating class loader via the 3508 // protection_domain. The protection_domain is passed as NULL by the java code 3509 // if there is no security manager in 3-arg Class.forName(). 3510 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3511 3512 KlassHandle klass_handle(THREAD, klass); 3513 // Check if we should initialize the class 3514 if (init && klass_handle->oop_is_instance()) { 3515 klass_handle->initialize(CHECK_NULL); 3516 } 3517 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror()); 3518} 3519 3520 3521// Method /////////////////////////////////////////////////////////////////////////////////////////// 3522 3523JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3524 JVMWrapper("JVM_InvokeMethod"); 3525 Handle method_handle; 3526 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3527 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3528 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3529 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3530 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3531 jobject res = JNIHandles::make_local(env, result); 3532 if (JvmtiExport::should_post_vm_object_alloc()) { 3533 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3534 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3535 if (java_lang_Class::is_primitive(ret_type)) { 3536 // Only for primitive type vm allocates memory for java object. 3537 // See box() method. 3538 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3539 } 3540 } 3541 return res; 3542 } else { 3543 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3544 } 3545JVM_END 3546 3547 3548JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3549 JVMWrapper("JVM_NewInstanceFromConstructor"); 3550 oop constructor_mirror = JNIHandles::resolve(c); 3551 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3552 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3553 jobject res = JNIHandles::make_local(env, result); 3554 if (JvmtiExport::should_post_vm_object_alloc()) { 3555 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3556 } 3557 return res; 3558JVM_END 3559 3560// Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3561 3562JVM_LEAF(jboolean, JVM_SupportsCX8()) 3563 JVMWrapper("JVM_SupportsCX8"); 3564 return VM_Version::supports_cx8(); 3565JVM_END 3566 3567// Returns an array of all live Thread objects (VM internal JavaThreads, 3568// jvmti agent threads, and JNI attaching threads are skipped) 3569// See CR 6404306 regarding JNI attaching threads 3570JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3571 ResourceMark rm(THREAD); 3572 ThreadsListEnumerator tle(THREAD, false, false); 3573 JvmtiVMObjectAllocEventCollector oam; 3574 3575 int num_threads = tle.num_threads(); 3576 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3577 objArrayHandle threads_ah(THREAD, r); 3578 3579 for (int i = 0; i < num_threads; i++) { 3580 Handle h = tle.get_threadObj(i); 3581 threads_ah->obj_at_put(i, h()); 3582 } 3583 3584 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3585JVM_END 3586 3587 3588// Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3589// Return StackTraceElement[][], each element is the stack trace of a thread in 3590// the corresponding entry in the given threads array 3591JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3592 JVMWrapper("JVM_DumpThreads"); 3593 JvmtiVMObjectAllocEventCollector oam; 3594 3595 // Check if threads is null 3596 if (threads == NULL) { 3597 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3598 } 3599 3600 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3601 objArrayHandle ah(THREAD, a); 3602 int num_threads = ah->length(); 3603 // check if threads is non-empty array 3604 if (num_threads == 0) { 3605 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3606 } 3607 3608 // check if threads is not an array of objects of Thread class 3609 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3610 if (k != SystemDictionary::Thread_klass()) { 3611 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3612 } 3613 3614 ResourceMark rm(THREAD); 3615 3616 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3617 for (int i = 0; i < num_threads; i++) { 3618 oop thread_obj = ah->obj_at(i); 3619 instanceHandle h(THREAD, (instanceOop) thread_obj); 3620 thread_handle_array->append(h); 3621 } 3622 3623 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3624 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3625 3626JVM_END 3627 3628// JVM monitoring and management support 3629JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3630 return Management::get_jmm_interface(version); 3631JVM_END 3632 3633// com.sun.tools.attach.VirtualMachine agent properties support 3634// 3635// Initialize the agent properties with the properties maintained in the VM 3636JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3637 JVMWrapper("JVM_InitAgentProperties"); 3638 ResourceMark rm; 3639 3640 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3641 3642 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3643 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3644 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3645 return properties; 3646JVM_END 3647 3648JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3649{ 3650 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3651 JvmtiVMObjectAllocEventCollector oam; 3652 3653 if (ofClass == NULL) { 3654 return NULL; 3655 } 3656 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3657 // Special handling for primitive objects 3658 if (java_lang_Class::is_primitive(mirror())) { 3659 return NULL; 3660 } 3661 Klass* k = java_lang_Class::as_Klass(mirror()); 3662 if (!k->oop_is_instance()) { 3663 return NULL; 3664 } 3665 instanceKlassHandle ik_h(THREAD, k); 3666 int encl_method_class_idx = ik_h->enclosing_method_class_index(); 3667 if (encl_method_class_idx == 0) { 3668 return NULL; 3669 } 3670 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3671 objArrayHandle dest(THREAD, dest_o); 3672 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3673 dest->obj_at_put(0, enc_k->java_mirror()); 3674 int encl_method_method_idx = ik_h->enclosing_method_method_index(); 3675 if (encl_method_method_idx != 0) { 3676 Symbol* sym = ik_h->constants()->symbol_at( 3677 extract_low_short_from_int( 3678 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3679 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3680 dest->obj_at_put(1, str()); 3681 sym = ik_h->constants()->symbol_at( 3682 extract_high_short_from_int( 3683 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3684 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3685 dest->obj_at_put(2, str()); 3686 } 3687 return (jobjectArray) JNIHandles::make_local(dest()); 3688} 3689JVM_END 3690 3691JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3692{ 3693 memset(info, 0, info_size); 3694 3695 info->jvm_version = Abstract_VM_Version::jvm_version(); 3696 info->update_version = 0; /* 0 in HotSpot Express VM */ 3697 info->special_update_version = 0; /* 0 in HotSpot Express VM */ 3698 3699 // when we add a new capability in the jvm_version_info struct, we should also 3700 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3701 // counter defined in runtimeService.cpp. 3702 info->is_attachable = AttachListener::is_attach_supported(); 3703} 3704JVM_END 3705