1 /* 2 * Copyright (c) 1997, 2016, 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/classFileStream.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/classLoaderData.inline.hpp" 29 #include "classfile/javaAssertions.hpp" 30 #include "classfile/javaClasses.inline.hpp" 31 #include "classfile/moduleEntry.hpp" 32 #include "classfile/modules.hpp" 33 #include "classfile/packageEntry.hpp" 34 #include "classfile/stringTable.hpp" 35 #include "classfile/systemDictionary.hpp" 36 #include "classfile/vmSymbols.hpp" 37 #include "gc/shared/barrierSet.inline.hpp" 38 #include "gc/shared/collectedHeap.inline.hpp" 39 #include "interpreter/bytecode.hpp" 40 #include "memory/oopFactory.hpp" 41 #include "memory/resourceArea.hpp" 42 #include "memory/universe.inline.hpp" 43 #include "oops/fieldStreams.hpp" 44 #include "oops/instanceKlass.hpp" 45 #include "oops/method.hpp" 46 #include "oops/objArrayKlass.hpp" 47 #include "oops/objArrayOop.inline.hpp" 48 #include "oops/oop.inline.hpp" 49 #include "prims/jvm.h" 50 #include "prims/jvm_misc.hpp" 51 #include "prims/jvmtiExport.hpp" 52 #include "prims/jvmtiThreadState.hpp" 53 #include "prims/nativeLookup.hpp" 54 #include "prims/privilegedStack.hpp" 55 #include "prims/stackwalk.hpp" 56 #include "runtime/arguments.hpp" 57 #include "runtime/atomic.inline.hpp" 58 #include "runtime/handles.inline.hpp" 59 #include "runtime/init.hpp" 60 #include "runtime/interfaceSupport.hpp" 61 #include "runtime/java.hpp" 62 #include "runtime/javaCalls.hpp" 63 #include "runtime/jfieldIDWorkaround.hpp" 64 #include "runtime/orderAccess.inline.hpp" 65 #include "runtime/os.inline.hpp" 66 #include "runtime/perfData.hpp" 67 #include "runtime/reflection.hpp" 68 #include "runtime/thread.inline.hpp" 69 #include "runtime/vframe.hpp" 70 #include "runtime/vm_operations.hpp" 71 #include "runtime/vm_version.hpp" 72 #include "services/attachListener.hpp" 73 #include "services/management.hpp" 74 #include "services/threadService.hpp" 75 #include "trace/tracing.hpp" 76 #include "utilities/copy.hpp" 77 #include "utilities/defaultStream.hpp" 78 #include "utilities/dtrace.hpp" 79 #include "utilities/events.hpp" 80 #include "utilities/histogram.hpp" 81 #include "utilities/macros.hpp" 82 #include "utilities/utf8.hpp" 83 #if INCLUDE_CDS 84 #include "classfile/sharedClassUtil.hpp" 85 #include "classfile/systemDictionaryShared.hpp" 86 #endif 87 #ifdef TARGET_OS_FAMILY_linux 88 # include "jvm_linux.h" 89 #endif 90 #ifdef TARGET_OS_FAMILY_solaris 91 # include "jvm_solaris.h" 92 #endif 93 #ifdef TARGET_OS_FAMILY_windows 94 # include "jvm_windows.h" 95 #endif 96 #ifdef TARGET_OS_FAMILY_aix 97 # include "jvm_aix.h" 98 #endif 99 #ifdef TARGET_OS_FAMILY_bsd 100 # include "jvm_bsd.h" 101 #endif 102 103 #include <errno.h> 104 105 /* 106 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 107 such ctors and calls MUST NOT come between an oop declaration/init and its 108 usage because if objects are move this may cause various memory stomps, bus 109 errors and segfaults. Here is a cookbook for causing so called "naked oop 110 failures": 111 112 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 113 JVMWrapper("JVM_GetClassDeclaredFields"); 114 115 // Object address to be held directly in mirror & not visible to GC 116 oop mirror = JNIHandles::resolve_non_null(ofClass); 117 118 // If this ctor can hit a safepoint, moving objects around, then 119 ComplexConstructor foo; 120 121 // Boom! mirror may point to JUNK instead of the intended object 122 (some dereference of mirror) 123 124 // Here's another call that may block for GC, making mirror stale 125 MutexLocker ml(some_lock); 126 127 // And here's an initializer that can result in a stale oop 128 // all in one step. 129 oop o = call_that_can_throw_exception(TRAPS); 130 131 132 The solution is to keep the oop declaration BELOW the ctor or function 133 call that might cause a GC, do another resolve to reassign the oop, or 134 consider use of a Handle instead of an oop so there is immunity from object 135 motion. But note that the "QUICK" entries below do not have a handlemark 136 and thus can only support use of handles passed in. 137 */ 138 139 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 140 ResourceMark rm; 141 int line_number = -1; 142 const char * source_file = NULL; 143 const char * trace = "explicit"; 144 InstanceKlass* caller = NULL; 145 JavaThread* jthread = JavaThread::current(); 146 if (jthread->has_last_Java_frame()) { 147 vframeStream vfst(jthread); 148 149 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 150 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 151 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 152 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 153 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 154 155 Method* last_caller = NULL; 156 157 while (!vfst.at_end()) { 158 Method* m = vfst.method(); 159 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 160 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 161 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 162 break; 163 } 164 last_caller = m; 165 vfst.next(); 166 } 167 // if this is called from Class.forName0 and that is called from Class.forName, 168 // then print the caller of Class.forName. If this is Class.loadClass, then print 169 // that caller, otherwise keep quiet since this should be picked up elsewhere. 170 bool found_it = false; 171 if (!vfst.at_end() && 172 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 173 vfst.method()->name() == vmSymbols::forName0_name()) { 174 vfst.next(); 175 if (!vfst.at_end() && 176 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 177 vfst.method()->name() == vmSymbols::forName_name()) { 178 vfst.next(); 179 found_it = true; 180 } 181 } else if (last_caller != NULL && 182 last_caller->method_holder()->name() == 183 vmSymbols::java_lang_ClassLoader() && 184 (last_caller->name() == vmSymbols::loadClassInternal_name() || 185 last_caller->name() == vmSymbols::loadClass_name())) { 186 found_it = true; 187 } else if (!vfst.at_end()) { 188 if (vfst.method()->is_native()) { 189 // JNI call 190 found_it = true; 191 } 192 } 193 if (found_it && !vfst.at_end()) { 194 // found the caller 195 caller = vfst.method()->method_holder(); 196 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 197 if (line_number == -1) { 198 // show method name if it's a native method 199 trace = vfst.method()->name_and_sig_as_C_string(); 200 } 201 Symbol* s = caller->source_file_name(); 202 if (s != NULL) { 203 source_file = s->as_C_string(); 204 } 205 } 206 } 207 if (caller != NULL) { 208 if (to_class != caller) { 209 const char * from = caller->external_name(); 210 const char * to = to_class->external_name(); 211 // print in a single call to reduce interleaving between threads 212 if (source_file != NULL) { 213 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 214 } else { 215 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 216 } 217 } 218 } 219 } 220 221 void trace_class_resolution(Klass* to_class) { 222 EXCEPTION_MARK; 223 trace_class_resolution_impl(to_class, THREAD); 224 if (HAS_PENDING_EXCEPTION) { 225 CLEAR_PENDING_EXCEPTION; 226 } 227 } 228 229 // Wrapper to trace JVM functions 230 231 #ifdef ASSERT 232 Histogram* JVMHistogram; 233 volatile jint JVMHistogram_lock = 0; 234 235 class JVMHistogramElement : public HistogramElement { 236 public: 237 JVMHistogramElement(const char* name); 238 }; 239 240 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 241 _name = elementName; 242 uintx count = 0; 243 244 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 245 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 246 count +=1; 247 if ( (WarnOnStalledSpinLock > 0) 248 && (count % WarnOnStalledSpinLock == 0)) { 249 warning("JVMHistogram_lock seems to be stalled"); 250 } 251 } 252 } 253 254 if(JVMHistogram == NULL) 255 JVMHistogram = new Histogram("JVM Call Counts",100); 256 257 JVMHistogram->add_element(this); 258 Atomic::dec(&JVMHistogram_lock); 259 } 260 261 #define JVMCountWrapper(arg) \ 262 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 263 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 264 265 #define JVMWrapper(arg) JVMCountWrapper(arg); 266 #else 267 #define JVMWrapper(arg) 268 #endif 269 270 271 // Interface version ///////////////////////////////////////////////////////////////////// 272 273 274 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 275 return JVM_INTERFACE_VERSION; 276 JVM_END 277 278 279 // java.lang.System ////////////////////////////////////////////////////////////////////// 280 281 282 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 283 JVMWrapper("JVM_CurrentTimeMillis"); 284 return os::javaTimeMillis(); 285 JVM_END 286 287 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 288 JVMWrapper("JVM_NanoTime"); 289 return os::javaTimeNanos(); 290 JVM_END 291 292 // The function below is actually exposed by jdk.internal.misc.VM and not 293 // java.lang.System, but we choose to keep it here so that it stays next 294 // to JVM_CurrentTimeMillis and JVM_NanoTime 295 296 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 297 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 298 299 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 300 JVMWrapper("JVM_GetNanoTimeAdjustment"); 301 jlong seconds; 302 jlong nanos; 303 304 os::javaTimeSystemUTC(seconds, nanos); 305 306 // We're going to verify that the result can fit in a long. 307 // For that we need the difference in seconds between 'seconds' 308 // and 'offset_secs' to be such that: 309 // |seconds - offset_secs| < (2^63/10^9) 310 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 311 // which makes |seconds - offset_secs| < 2^33 312 // and we will prefer +/- 2^32 as the maximum acceptable diff 313 // as 2^32 has a more natural feel than 2^33... 314 // 315 // So if |seconds - offset_secs| >= 2^32 - we return a special 316 // sentinel value (-1) which the caller should take as an 317 // exception value indicating that the offset given to us is 318 // too far from range of the current time - leading to too big 319 // a nano adjustment. The caller is expected to recover by 320 // computing a more accurate offset and calling this method 321 // again. (For the record 2^32 secs is ~136 years, so that 322 // should rarely happen) 323 // 324 jlong diff = seconds - offset_secs; 325 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 326 return -1; // sentinel value: the offset is too far off the target 327 } 328 329 // return the adjustment. If you compute a time by adding 330 // this number of nanoseconds along with the number of seconds 331 // in the offset you should get the current UTC time. 332 return (diff * (jlong)1000000000) + nanos; 333 JVM_END 334 335 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 336 jobject dst, jint dst_pos, jint length)) 337 JVMWrapper("JVM_ArrayCopy"); 338 // Check if we have null pointers 339 if (src == NULL || dst == NULL) { 340 THROW(vmSymbols::java_lang_NullPointerException()); 341 } 342 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 343 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 344 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop"); 345 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop"); 346 // Do copy 347 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 348 JVM_END 349 350 351 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 352 JavaValue r(T_OBJECT); 353 // public synchronized Object put(Object key, Object value); 354 HandleMark hm(THREAD); 355 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 356 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 357 JavaCalls::call_virtual(&r, 358 props, 359 KlassHandle(THREAD, SystemDictionary::Properties_klass()), 360 vmSymbols::put_name(), 361 vmSymbols::object_object_object_signature(), 362 key_str, 363 value_str, 364 THREAD); 365 } 366 367 368 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 369 370 371 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 372 JVMWrapper("JVM_InitProperties"); 373 ResourceMark rm; 374 375 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 376 377 // System property list includes both user set via -D option and 378 // jvm system specific properties. 379 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 380 PUTPROP(props, p->key(), p->value()); 381 } 382 383 // Convert the -XX:MaxDirectMemorySize= command line flag 384 // to the sun.nio.MaxDirectMemorySize property. 385 // Do this after setting user properties to prevent people 386 // from setting the value with a -D option, as requested. 387 { 388 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 389 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 390 } else { 391 char as_chars[256]; 392 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 393 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 394 } 395 } 396 397 // JVM monitoring and management support 398 // Add the sun.management.compiler property for the compiler's name 399 { 400 #undef CSIZE 401 #if defined(_LP64) || defined(_WIN64) 402 #define CSIZE "64-Bit " 403 #else 404 #define CSIZE 405 #endif // 64bit 406 407 #ifdef TIERED 408 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 409 #else 410 #if defined(COMPILER1) 411 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 412 #elif defined(COMPILER2) 413 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 414 #elif INCLUDE_JVMCI 415 #error "INCLUDE_JVMCI should imply TIERED" 416 #else 417 const char* compiler_name = ""; 418 #endif // compilers 419 #endif // TIERED 420 421 if (*compiler_name != '\0' && 422 (Arguments::mode() != Arguments::_int)) { 423 PUTPROP(props, "sun.management.compiler", compiler_name); 424 } 425 } 426 427 return properties; 428 JVM_END 429 430 431 /* 432 * Return the temporary directory that the VM uses for the attach 433 * and perf data files. 434 * 435 * It is important that this directory is well-known and the 436 * same for all VM instances. It cannot be affected by configuration 437 * variables such as java.io.tmpdir. 438 */ 439 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 440 JVMWrapper("JVM_GetTemporaryDirectory"); 441 HandleMark hm(THREAD); 442 const char* temp_dir = os::get_temp_directory(); 443 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 444 return (jstring) JNIHandles::make_local(env, h()); 445 JVM_END 446 447 448 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 449 450 extern volatile jint vm_created; 451 452 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 453 before_exit(thread); 454 vm_exit(code); 455 JVM_END 456 457 458 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 459 JVMWrapper("JVM_GC"); 460 if (!DisableExplicitGC) { 461 Universe::heap()->collect(GCCause::_java_lang_system_gc); 462 } 463 JVM_END 464 465 466 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 467 JVMWrapper("JVM_MaxObjectInspectionAge"); 468 return Universe::heap()->millis_since_last_gc(); 469 JVM_END 470 471 472 static inline jlong convert_size_t_to_jlong(size_t val) { 473 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 474 NOT_LP64 (return (jlong)val;) 475 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 476 } 477 478 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 479 JVMWrapper("JVM_TotalMemory"); 480 size_t n = Universe::heap()->capacity(); 481 return convert_size_t_to_jlong(n); 482 JVM_END 483 484 485 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 486 JVMWrapper("JVM_FreeMemory"); 487 CollectedHeap* ch = Universe::heap(); 488 size_t n; 489 { 490 MutexLocker x(Heap_lock); 491 n = ch->capacity() - ch->used(); 492 } 493 return convert_size_t_to_jlong(n); 494 JVM_END 495 496 497 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 498 JVMWrapper("JVM_MaxMemory"); 499 size_t n = Universe::heap()->max_capacity(); 500 return convert_size_t_to_jlong(n); 501 JVM_END 502 503 504 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 505 JVMWrapper("JVM_ActiveProcessorCount"); 506 return os::active_processor_count(); 507 JVM_END 508 509 510 511 // java.lang.Throwable ////////////////////////////////////////////////////// 512 513 514 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 515 JVMWrapper("JVM_FillInStackTrace"); 516 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 517 java_lang_Throwable::fill_in_stack_trace(exception); 518 JVM_END 519 520 521 JVM_ENTRY(void, JVM_GetStackTraceElements(JNIEnv *env, jobject throwable, jobjectArray stackTrace)) 522 JVMWrapper("JVM_GetStackTraceElements"); 523 Handle exception(THREAD, JNIHandles::resolve(throwable)); 524 objArrayOop st = objArrayOop(JNIHandles::resolve(stackTrace)); 525 objArrayHandle stack_trace(THREAD, st); 526 // Fill in the allocated stack trace 527 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 528 JVM_END 529 530 531 // java.lang.StackWalker ////////////////////////////////////////////////////// 532 533 534 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 535 jint skip_frames, jint frame_count, jint start_index, 536 jobjectArray frames)) 537 JVMWrapper("JVM_CallStackWalk"); 538 JavaThread* jt = (JavaThread*) THREAD; 539 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 540 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 541 } 542 543 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 544 545 // frames array is a Class<?>[] array when only getting caller reference, 546 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 547 // be null. 548 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 549 objArrayHandle frames_array_h(THREAD, fa); 550 551 int limit = start_index + frame_count; 552 if (frames_array_h->length() < limit) { 553 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 554 } 555 556 Handle result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 557 start_index, frames_array_h, CHECK_NULL); 558 return JNIHandles::make_local(env, result()); 559 JVM_END 560 561 562 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 563 jint frame_count, jint start_index, 564 jobjectArray frames)) 565 JVMWrapper("JVM_MoreStackWalk"); 566 JavaThread* jt = (JavaThread*) THREAD; 567 568 // frames array is a Class<?>[] array when only getting caller reference, 569 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 570 // be null. 571 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 572 objArrayHandle frames_array_h(THREAD, fa); 573 574 int limit = start_index+frame_count; 575 if (frames_array_h->length() < limit) { 576 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 577 } 578 579 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 580 return StackWalk::moreFrames(stackStream_h, mode, anchor, frame_count, 581 start_index, frames_array_h, THREAD); 582 JVM_END 583 584 JVM_ENTRY(void, JVM_ToStackTraceElement(JNIEnv *env, jobject frame, jobject stack)) 585 JVMWrapper("JVM_ToStackTraceElement"); 586 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(frame)); 587 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(stack)); 588 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 589 JVM_END 590 591 // java.lang.Object /////////////////////////////////////////////// 592 593 594 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 595 JVMWrapper("JVM_IHashCode"); 596 // as implemented in the classic virtual machine; return 0 if object is NULL 597 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 598 JVM_END 599 600 601 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 602 JVMWrapper("JVM_MonitorWait"); 603 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 604 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 605 if (JvmtiExport::should_post_monitor_wait()) { 606 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 607 608 // The current thread already owns the monitor and it has not yet 609 // been added to the wait queue so the current thread cannot be 610 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 611 // event handler cannot accidentally consume an unpark() meant for 612 // the ParkEvent associated with this ObjectMonitor. 613 } 614 ObjectSynchronizer::wait(obj, ms, CHECK); 615 JVM_END 616 617 618 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 619 JVMWrapper("JVM_MonitorNotify"); 620 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 621 ObjectSynchronizer::notify(obj, CHECK); 622 JVM_END 623 624 625 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 626 JVMWrapper("JVM_MonitorNotifyAll"); 627 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 628 ObjectSynchronizer::notifyall(obj, CHECK); 629 JVM_END 630 631 632 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 633 JVMWrapper("JVM_Clone"); 634 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 635 const KlassHandle klass (THREAD, obj->klass()); 636 JvmtiVMObjectAllocEventCollector oam; 637 638 #ifdef ASSERT 639 // Just checking that the cloneable flag is set correct 640 if (obj->is_array()) { 641 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 642 } else { 643 guarantee(obj->is_instance(), "should be instanceOop"); 644 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 645 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 646 } 647 #endif 648 649 // Check if class of obj supports the Cloneable interface. 650 // All arrays are considered to be cloneable (See JLS 20.1.5) 651 if (!klass->is_cloneable()) { 652 ResourceMark rm(THREAD); 653 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 654 } 655 656 // Make shallow object copy 657 const int size = obj->size(); 658 oop new_obj_oop = NULL; 659 if (obj->is_array()) { 660 const int length = ((arrayOop)obj())->length(); 661 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 662 } else { 663 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 664 } 665 666 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread 667 // is modifying a reference field in the clonee, a non-oop-atomic copy might 668 // be suspended in the middle of copying the pointer and end up with parts 669 // of two different pointers in the field. Subsequent dereferences will crash. 670 // 4846409: an oop-copy of objects with long or double fields or arrays of same 671 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead 672 // of oops. We know objects are aligned on a minimum of an jlong boundary. 673 // The same is true of StubRoutines::object_copy and the various oop_copy 674 // variants, and of the code generated by the inline_native_clone intrinsic. 675 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); 676 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop, 677 (size_t)align_object_size(size) / HeapWordsPerLong); 678 // Clear the header 679 new_obj_oop->init_mark(); 680 681 // Store check (mark entire object and let gc sort it out) 682 BarrierSet* bs = Universe::heap()->barrier_set(); 683 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); 684 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); 685 686 Handle new_obj(THREAD, new_obj_oop); 687 // Special handling for MemberNames. Since they contain Method* metadata, they 688 // must be registered so that RedefineClasses can fix metadata contained in them. 689 if (java_lang_invoke_MemberName::is_instance(new_obj()) && 690 java_lang_invoke_MemberName::is_method(new_obj())) { 691 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj()); 692 // MemberName may be unresolved, so doesn't need registration until resolved. 693 if (method != NULL) { 694 methodHandle m(THREAD, method); 695 // This can safepoint and redefine method, so need both new_obj and method 696 // in a handle, for two different reasons. new_obj can move, method can be 697 // deleted if nothing is using it on the stack. 698 m->method_holder()->add_member_name(new_obj(), false); 699 } 700 } 701 702 // Caution: this involves a java upcall, so the clone should be 703 // "gc-robust" by this stage. 704 if (klass->has_finalizer()) { 705 assert(obj->is_instance(), "should be instanceOop"); 706 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 707 new_obj = Handle(THREAD, new_obj_oop); 708 } 709 710 return JNIHandles::make_local(env, new_obj()); 711 JVM_END 712 713 // java.io.File /////////////////////////////////////////////////////////////// 714 715 JVM_LEAF(char*, JVM_NativePath(char* path)) 716 JVMWrapper("JVM_NativePath"); 717 return os::native_path(path); 718 JVM_END 719 720 721 // Misc. class handling /////////////////////////////////////////////////////////// 722 723 724 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 725 JVMWrapper("JVM_GetCallerClass"); 726 727 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 728 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 729 // temporarily for existing code to use until a replacement API is defined. 730 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 731 Klass* k = thread->security_get_caller_class(depth); 732 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 733 } 734 735 // Getting the class of the caller frame. 736 // 737 // The call stack at this point looks something like this: 738 // 739 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 740 // [1] [ @CallerSensitive API.method ] 741 // [.] [ (skipped intermediate frames) ] 742 // [n] [ caller ] 743 vframeStream vfst(thread); 744 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 745 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 746 Method* m = vfst.method(); 747 assert(m != NULL, "sanity"); 748 switch (n) { 749 case 0: 750 // This must only be called from Reflection.getCallerClass 751 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 752 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 753 } 754 // fall-through 755 case 1: 756 // Frame 0 and 1 must be caller sensitive. 757 if (!m->caller_sensitive()) { 758 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 759 } 760 break; 761 default: 762 if (!m->is_ignored_by_security_stack_walk()) { 763 // We have reached the desired frame; return the holder class. 764 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 765 } 766 break; 767 } 768 } 769 return NULL; 770 JVM_END 771 772 773 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 774 JVMWrapper("JVM_FindPrimitiveClass"); 775 oop mirror = NULL; 776 BasicType t = name2type(utf); 777 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 778 mirror = Universe::java_mirror(t); 779 } 780 if (mirror == NULL) { 781 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 782 } else { 783 return (jclass) JNIHandles::make_local(env, mirror); 784 } 785 JVM_END 786 787 788 // Returns a class loaded by the bootstrap class loader; or null 789 // if not found. ClassNotFoundException is not thrown. 790 // FindClassFromBootLoader is exported to the launcher for windows. 791 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 792 const char* name)) 793 JVMWrapper("JVM_FindClassFromBootLoader"); 794 795 // Java libraries should ensure that name is never null... 796 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 797 // It's impossible to create this class; the name cannot fit 798 // into the constant pool. 799 return NULL; 800 } 801 802 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 803 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 804 if (k == NULL) { 805 return NULL; 806 } 807 808 if (log_is_enabled(Debug, class, resolve)) { 809 trace_class_resolution(k); 810 } 811 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 812 JVM_END 813 814 // Find a class with this name in this loader, using the caller's protection domain. 815 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 816 jboolean init, jobject loader, 817 jclass caller)) 818 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 819 // Java libraries should ensure that name is never null... 820 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 821 // It's impossible to create this class; the name cannot fit 822 // into the constant pool. 823 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 824 } 825 826 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 827 828 oop loader_oop = JNIHandles::resolve(loader); 829 oop from_class = JNIHandles::resolve(caller); 830 oop protection_domain = NULL; 831 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 832 // NPE. Put it in another way, the bootstrap class loader has all permission and 833 // thus no checkPackageAccess equivalence in the VM class loader. 834 // The caller is also passed as NULL by the java code if there is no security 835 // manager to avoid the performance cost of getting the calling class. 836 if (from_class != NULL && loader_oop != NULL) { 837 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 838 } 839 840 Handle h_loader(THREAD, loader_oop); 841 Handle h_prot(THREAD, protection_domain); 842 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 843 h_prot, false, THREAD); 844 845 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 846 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 847 } 848 return result; 849 JVM_END 850 851 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 852 jboolean init, jclass from)) 853 JVMWrapper("JVM_FindClassFromClass"); 854 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 855 // It's impossible to create this class; the name cannot fit 856 // into the constant pool. 857 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 858 } 859 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 860 oop from_class_oop = JNIHandles::resolve(from); 861 Klass* from_class = (from_class_oop == NULL) 862 ? (Klass*)NULL 863 : java_lang_Class::as_Klass(from_class_oop); 864 oop class_loader = NULL; 865 oop protection_domain = NULL; 866 if (from_class != NULL) { 867 class_loader = from_class->class_loader(); 868 protection_domain = from_class->protection_domain(); 869 } 870 Handle h_loader(THREAD, class_loader); 871 Handle h_prot (THREAD, protection_domain); 872 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 873 h_prot, true, thread); 874 875 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 876 // this function is generally only used for class loading during verification. 877 ResourceMark rm; 878 oop from_mirror = JNIHandles::resolve_non_null(from); 879 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 880 const char * from_name = from_class->external_name(); 881 882 oop mirror = JNIHandles::resolve_non_null(result); 883 Klass* to_class = java_lang_Class::as_Klass(mirror); 884 const char * to = to_class->external_name(); 885 log_debug(class, resolve)("%s %s (verification)", from_name, to); 886 } 887 888 return result; 889 JVM_END 890 891 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 892 if (loader.is_null()) { 893 return; 894 } 895 896 // check whether the current caller thread holds the lock or not. 897 // If not, increment the corresponding counter 898 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 899 ObjectSynchronizer::owner_self) { 900 counter->inc(); 901 } 902 } 903 904 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 905 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 906 jobject loader, const jbyte *buf, 907 jsize len, jobject pd, const char *source, 908 TRAPS) { 909 if (source == NULL) source = "__JVM_DefineClass__"; 910 911 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 912 JavaThread* jt = (JavaThread*) THREAD; 913 914 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 915 ClassLoader::perf_define_appclass_selftime(), 916 ClassLoader::perf_define_appclasses(), 917 jt->get_thread_stat()->perf_recursion_counts_addr(), 918 jt->get_thread_stat()->perf_timers_addr(), 919 PerfClassTraceTime::DEFINE_CLASS); 920 921 if (UsePerfData) { 922 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 923 } 924 925 // Since exceptions can be thrown, class initialization can take place 926 // if name is NULL no check for class name in .class stream has to be made. 927 TempNewSymbol class_name = NULL; 928 if (name != NULL) { 929 const int str_len = (int)strlen(name); 930 if (str_len > Symbol::max_length()) { 931 // It's impossible to create this class; the name cannot fit 932 // into the constant pool. 933 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 934 } 935 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 936 } 937 938 ResourceMark rm(THREAD); 939 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 940 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 941 if (UsePerfData) { 942 is_lock_held_by_thread(class_loader, 943 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 944 THREAD); 945 } 946 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 947 Klass* k = SystemDictionary::resolve_from_stream(class_name, 948 class_loader, 949 protection_domain, 950 &st, 951 CHECK_NULL); 952 953 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 954 trace_class_resolution(k); 955 } 956 957 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 958 } 959 960 961 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 962 JVMWrapper("JVM_DefineClass"); 963 964 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 965 JVM_END 966 967 968 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 969 JVMWrapper("JVM_DefineClassWithSource"); 970 971 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 972 JVM_END 973 974 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 975 JVMWrapper("JVM_FindLoadedClass"); 976 ResourceMark rm(THREAD); 977 978 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 979 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 980 981 const char* str = java_lang_String::as_utf8_string(string()); 982 // Sanity check, don't expect null 983 if (str == NULL) return NULL; 984 985 const int str_len = (int)strlen(str); 986 if (str_len > Symbol::max_length()) { 987 // It's impossible to create this class; the name cannot fit 988 // into the constant pool. 989 return NULL; 990 } 991 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 992 993 // Security Note: 994 // The Java level wrapper will perform the necessary security check allowing 995 // us to pass the NULL as the initiating class loader. 996 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 997 if (UsePerfData) { 998 is_lock_held_by_thread(h_loader, 999 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1000 THREAD); 1001 } 1002 1003 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1004 h_loader, 1005 Handle(), 1006 CHECK_NULL); 1007 #if INCLUDE_CDS 1008 if (k == NULL) { 1009 // If the class is not already loaded, try to see if it's in the shared 1010 // archive for the current classloader (h_loader). 1011 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class( 1012 klass_name, h_loader, CHECK_NULL); 1013 k = ik(); 1014 } 1015 #endif 1016 return (k == NULL) ? NULL : 1017 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1018 JVM_END 1019 1020 // Module support ////////////////////////////////////////////////////////////////////////////// 1021 1022 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jstring version, jstring location, 1023 jobjectArray packages)) 1024 JVMWrapper("JVM_DefineModule"); 1025 Modules::define_module(module, version, location, packages, CHECK); 1026 JVM_END 1027 1028 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1029 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1030 Modules::set_bootloader_unnamed_module(module, CHECK); 1031 JVM_END 1032 1033 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1034 JVMWrapper("JVM_AddModuleExports"); 1035 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1036 JVM_END 1037 1038 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1039 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1040 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1041 JVM_END 1042 1043 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1044 JVMWrapper("JVM_AddModuleExportsToAll"); 1045 Modules::add_module_exports(from_module, package, NULL, CHECK); 1046 JVM_END 1047 1048 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1049 JVMWrapper("JVM_AddReadsModule"); 1050 Modules::add_reads_module(from_module, source_module, CHECK); 1051 JVM_END 1052 1053 JVM_ENTRY(jboolean, JVM_CanReadModule(JNIEnv *env, jobject asking_module, jobject source_module)) 1054 JVMWrapper("JVM_CanReadModule"); 1055 return Modules::can_read_module(asking_module, source_module, THREAD); 1056 JVM_END 1057 1058 JVM_ENTRY(jboolean, JVM_IsExportedToModule(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1059 JVMWrapper("JVM_IsExportedToModule"); 1060 return Modules::is_exported_to_module(from_module, package, to_module, THREAD); 1061 JVM_END 1062 1063 JVM_ENTRY (void, JVM_AddModulePackage(JNIEnv *env, jobject module, jstring package)) 1064 JVMWrapper("JVM_AddModulePackage"); 1065 Modules::add_module_package(module, package, CHECK); 1066 JVM_END 1067 1068 JVM_ENTRY (jobject, JVM_GetModuleByPackageName(JNIEnv *env, jobject loader, jstring package)) 1069 JVMWrapper("JVM_GetModuleByPackageName"); 1070 return Modules::get_module_by_package_name(loader, package, THREAD); 1071 JVM_END 1072 1073 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1074 1075 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1076 assert (cls != NULL, "illegal class"); 1077 JVMWrapper("JVM_GetClassName"); 1078 JvmtiVMObjectAllocEventCollector oam; 1079 ResourceMark rm(THREAD); 1080 const char* name; 1081 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1082 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1083 } else { 1084 // Consider caching interned string in Klass 1085 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1086 assert(k->is_klass(), "just checking"); 1087 name = k->external_name(); 1088 } 1089 oop result = StringTable::intern((char*) name, CHECK_NULL); 1090 return (jstring) JNIHandles::make_local(env, result); 1091 JVM_END 1092 1093 1094 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1095 JVMWrapper("JVM_GetClassInterfaces"); 1096 JvmtiVMObjectAllocEventCollector oam; 1097 oop mirror = JNIHandles::resolve_non_null(cls); 1098 1099 // Special handling for primitive objects 1100 if (java_lang_Class::is_primitive(mirror)) { 1101 // Primitive objects does not have any interfaces 1102 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1103 return (jobjectArray) JNIHandles::make_local(env, r); 1104 } 1105 1106 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror)); 1107 // Figure size of result array 1108 int size; 1109 if (klass->is_instance_klass()) { 1110 size = InstanceKlass::cast(klass())->local_interfaces()->length(); 1111 } else { 1112 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1113 size = 2; 1114 } 1115 1116 // Allocate result array 1117 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1118 objArrayHandle result (THREAD, r); 1119 // Fill in result 1120 if (klass->is_instance_klass()) { 1121 // Regular instance klass, fill in all local interfaces 1122 for (int index = 0; index < size; index++) { 1123 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index); 1124 result->obj_at_put(index, k->java_mirror()); 1125 } 1126 } else { 1127 // All arrays implement java.lang.Cloneable and java.io.Serializable 1128 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1129 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1130 } 1131 return (jobjectArray) JNIHandles::make_local(env, result()); 1132 JVM_END 1133 1134 1135 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1136 JVMWrapper("JVM_IsInterface"); 1137 oop mirror = JNIHandles::resolve_non_null(cls); 1138 if (java_lang_Class::is_primitive(mirror)) { 1139 return JNI_FALSE; 1140 } 1141 Klass* k = java_lang_Class::as_Klass(mirror); 1142 jboolean result = k->is_interface(); 1143 assert(!result || k->is_instance_klass(), 1144 "all interfaces are instance types"); 1145 // The compiler intrinsic for isInterface tests the 1146 // Klass::_access_flags bits in the same way. 1147 return result; 1148 JVM_END 1149 1150 1151 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1152 JVMWrapper("JVM_GetClassSigners"); 1153 JvmtiVMObjectAllocEventCollector oam; 1154 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1155 // There are no signers for primitive types 1156 return NULL; 1157 } 1158 1159 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1160 1161 // If there are no signers set in the class, or if the class 1162 // is an array, return NULL. 1163 if (signers == NULL) return NULL; 1164 1165 // copy of the signers array 1166 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1167 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1168 for (int index = 0; index < signers->length(); index++) { 1169 signers_copy->obj_at_put(index, signers->obj_at(index)); 1170 } 1171 1172 // return the copy 1173 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1174 JVM_END 1175 1176 1177 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1178 JVMWrapper("JVM_SetClassSigners"); 1179 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1180 // This call is ignored for primitive types and arrays. 1181 // Signers are only set once, ClassLoader.java, and thus shouldn't 1182 // be called with an array. Only the bootstrap loader creates arrays. 1183 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1184 if (k->is_instance_klass()) { 1185 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1186 } 1187 } 1188 JVM_END 1189 1190 1191 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1192 JVMWrapper("JVM_GetProtectionDomain"); 1193 if (JNIHandles::resolve(cls) == NULL) { 1194 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1195 } 1196 1197 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1198 // Primitive types does not have a protection domain. 1199 return NULL; 1200 } 1201 1202 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1203 return (jobject) JNIHandles::make_local(env, pd); 1204 JVM_END 1205 1206 1207 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) { 1208 // If there is a security manager and protection domain, check the access 1209 // in the protection domain, otherwise it is authorized. 1210 if (java_lang_System::has_security_manager()) { 1211 1212 // For bootstrapping, if pd implies method isn't in the JDK, allow 1213 // this context to revert to older behavior. 1214 // In this case the isAuthorized field in AccessControlContext is also not 1215 // present. 1216 if (Universe::protection_domain_implies_method() == NULL) { 1217 return true; 1218 } 1219 1220 // Whitelist certain access control contexts 1221 if (java_security_AccessControlContext::is_authorized(context)) { 1222 return true; 1223 } 1224 1225 oop prot = klass->protection_domain(); 1226 if (prot != NULL) { 1227 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1228 // in the new wrapper. 1229 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1230 Handle h_prot(THREAD, prot); 1231 JavaValue result(T_BOOLEAN); 1232 JavaCallArguments args(h_prot); 1233 JavaCalls::call(&result, m, &args, CHECK_false); 1234 return (result.get_jboolean() != 0); 1235 } 1236 } 1237 return true; 1238 } 1239 1240 // Create an AccessControlContext with a protection domain with null codesource 1241 // and null permissions - which gives no permissions. 1242 oop create_dummy_access_control_context(TRAPS) { 1243 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1244 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1245 // Call constructor ProtectionDomain(null, null); 1246 JavaValue result(T_VOID); 1247 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass), 1248 vmSymbols::object_initializer_name(), 1249 vmSymbols::codesource_permissioncollection_signature(), 1250 Handle(), Handle(), CHECK_NULL); 1251 1252 // new ProtectionDomain[] {pd}; 1253 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1254 context->obj_at_put(0, obj()); 1255 1256 // new AccessControlContext(new ProtectionDomain[] {pd}) 1257 objArrayHandle h_context(THREAD, context); 1258 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1259 return acc; 1260 } 1261 1262 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1263 JVMWrapper("JVM_DoPrivileged"); 1264 1265 if (action == NULL) { 1266 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1267 } 1268 1269 // Compute the frame initiating the do privileged operation and setup the privileged stack 1270 vframeStream vfst(thread); 1271 vfst.security_get_caller_frame(1); 1272 1273 if (vfst.at_end()) { 1274 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1275 } 1276 1277 Method* method = vfst.method(); 1278 instanceKlassHandle klass (THREAD, method->method_holder()); 1279 1280 // Check that action object understands "Object run()" 1281 Handle h_context; 1282 if (context != NULL) { 1283 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1284 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1285 if (!authorized) { 1286 // Create an unprivileged access control object and call it's run function 1287 // instead. 1288 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1289 h_context = Handle(THREAD, noprivs); 1290 } 1291 } 1292 1293 // Check that action object understands "Object run()" 1294 Handle object (THREAD, JNIHandles::resolve(action)); 1295 1296 // get run() method 1297 Method* m_oop = object->klass()->uncached_lookup_method( 1298 vmSymbols::run_method_name(), 1299 vmSymbols::void_object_signature(), 1300 Klass::find_overpass); 1301 methodHandle m (THREAD, m_oop); 1302 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { 1303 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1304 } 1305 1306 // Stack allocated list of privileged stack elements 1307 PrivilegedElement pi; 1308 if (!vfst.at_end()) { 1309 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1310 thread->set_privileged_stack_top(&pi); 1311 } 1312 1313 1314 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1315 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1316 Handle pending_exception; 1317 JavaValue result(T_OBJECT); 1318 JavaCallArguments args(object); 1319 JavaCalls::call(&result, m, &args, THREAD); 1320 1321 // done with action, remove ourselves from the list 1322 if (!vfst.at_end()) { 1323 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1324 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1325 } 1326 1327 if (HAS_PENDING_EXCEPTION) { 1328 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1329 CLEAR_PENDING_EXCEPTION; 1330 // JVMTI has already reported the pending exception 1331 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1332 if (THREAD->is_Java_thread()) { 1333 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1334 } 1335 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1336 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1337 // Throw a java.security.PrivilegedActionException(Exception e) exception 1338 JavaCallArguments args(pending_exception); 1339 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1340 vmSymbols::exception_void_signature(), 1341 &args); 1342 } 1343 } 1344 1345 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1346 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1347 JVM_END 1348 1349 1350 // Returns the inherited_access_control_context field of the running thread. 1351 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1352 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1353 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1354 return JNIHandles::make_local(env, result); 1355 JVM_END 1356 1357 class RegisterArrayForGC { 1358 private: 1359 JavaThread *_thread; 1360 public: 1361 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1362 _thread = thread; 1363 _thread->register_array_for_gc(array); 1364 } 1365 1366 ~RegisterArrayForGC() { 1367 _thread->register_array_for_gc(NULL); 1368 } 1369 }; 1370 1371 1372 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1373 JVMWrapper("JVM_GetStackAccessControlContext"); 1374 if (!UsePrivilegedStack) return NULL; 1375 1376 ResourceMark rm(THREAD); 1377 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1378 JvmtiVMObjectAllocEventCollector oam; 1379 1380 // count the protection domains on the execution stack. We collapse 1381 // duplicate consecutive protection domains into a single one, as 1382 // well as stopping when we hit a privileged frame. 1383 1384 // Use vframeStream to iterate through Java frames 1385 vframeStream vfst(thread); 1386 1387 oop previous_protection_domain = NULL; 1388 Handle privileged_context(thread, NULL); 1389 bool is_privileged = false; 1390 oop protection_domain = NULL; 1391 1392 for(; !vfst.at_end(); vfst.next()) { 1393 // get method of frame 1394 Method* method = vfst.method(); 1395 intptr_t* frame_id = vfst.frame_id(); 1396 1397 // check the privileged frames to see if we have a match 1398 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1399 // this frame is privileged 1400 is_privileged = true; 1401 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1402 protection_domain = thread->privileged_stack_top()->protection_domain(); 1403 } else { 1404 protection_domain = method->method_holder()->protection_domain(); 1405 } 1406 1407 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1408 local_array->push(protection_domain); 1409 previous_protection_domain = protection_domain; 1410 } 1411 1412 if (is_privileged) break; 1413 } 1414 1415 1416 // either all the domains on the stack were system domains, or 1417 // we had a privileged system domain 1418 if (local_array->is_empty()) { 1419 if (is_privileged && privileged_context.is_null()) return NULL; 1420 1421 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1422 return JNIHandles::make_local(env, result); 1423 } 1424 1425 // the resource area must be registered in case of a gc 1426 RegisterArrayForGC ragc(thread, local_array); 1427 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1428 local_array->length(), CHECK_NULL); 1429 objArrayHandle h_context(thread, context); 1430 for (int index = 0; index < local_array->length(); index++) { 1431 h_context->obj_at_put(index, local_array->at(index)); 1432 } 1433 1434 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1435 1436 return JNIHandles::make_local(env, result); 1437 JVM_END 1438 1439 1440 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1441 JVMWrapper("JVM_IsArrayClass"); 1442 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1443 return (k != NULL) && k->is_array_klass() ? true : false; 1444 JVM_END 1445 1446 1447 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1448 JVMWrapper("JVM_IsPrimitiveClass"); 1449 oop mirror = JNIHandles::resolve_non_null(cls); 1450 return (jboolean) java_lang_Class::is_primitive(mirror); 1451 JVM_END 1452 1453 1454 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1455 JVMWrapper("JVM_GetClassModifiers"); 1456 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1457 // Primitive type 1458 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1459 } 1460 1461 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1462 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1463 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1464 return k->modifier_flags(); 1465 JVM_END 1466 1467 1468 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1469 1470 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1471 JvmtiVMObjectAllocEventCollector oam; 1472 // ofClass is a reference to a java_lang_Class object. The mirror object 1473 // of an InstanceKlass 1474 1475 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1476 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1477 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1478 return (jobjectArray)JNIHandles::make_local(env, result); 1479 } 1480 1481 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1482 InnerClassesIterator iter(k); 1483 1484 if (iter.length() == 0) { 1485 // Neither an inner nor outer class 1486 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1487 return (jobjectArray)JNIHandles::make_local(env, result); 1488 } 1489 1490 // find inner class info 1491 constantPoolHandle cp(thread, k->constants()); 1492 int length = iter.length(); 1493 1494 // Allocate temp. result array 1495 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1496 objArrayHandle result (THREAD, r); 1497 int members = 0; 1498 1499 for (; !iter.done(); iter.next()) { 1500 int ioff = iter.inner_class_info_index(); 1501 int ooff = iter.outer_class_info_index(); 1502 1503 if (ioff != 0 && ooff != 0) { 1504 // Check to see if the name matches the class we're looking for 1505 // before attempting to find the class. 1506 if (cp->klass_name_at_matches(k, ooff)) { 1507 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1508 if (outer_klass == k()) { 1509 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1510 instanceKlassHandle inner_klass (THREAD, ik); 1511 1512 // Throws an exception if outer klass has not declared k as 1513 // an inner klass 1514 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1515 1516 result->obj_at_put(members, inner_klass->java_mirror()); 1517 members++; 1518 } 1519 } 1520 } 1521 } 1522 1523 if (members != length) { 1524 // Return array of right length 1525 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1526 for(int i = 0; i < members; i++) { 1527 res->obj_at_put(i, result->obj_at(i)); 1528 } 1529 return (jobjectArray)JNIHandles::make_local(env, res); 1530 } 1531 1532 return (jobjectArray)JNIHandles::make_local(env, result()); 1533 JVM_END 1534 1535 1536 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1537 { 1538 // ofClass is a reference to a java_lang_Class object. 1539 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1540 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1541 return NULL; 1542 } 1543 1544 bool inner_is_member = false; 1545 Klass* outer_klass 1546 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1547 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1548 if (outer_klass == NULL) return NULL; // already a top-level class 1549 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1550 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1551 } 1552 JVM_END 1553 1554 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1555 { 1556 oop mirror = JNIHandles::resolve_non_null(cls); 1557 if (java_lang_Class::is_primitive(mirror) || 1558 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1559 return NULL; 1560 } 1561 instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror))); 1562 int ooff = 0, noff = 0; 1563 if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) { 1564 if (noff != 0) { 1565 constantPoolHandle i_cp(thread, k->constants()); 1566 Symbol* name = i_cp->symbol_at(noff); 1567 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1568 return (jstring) JNIHandles::make_local(env, str()); 1569 } 1570 } 1571 return NULL; 1572 } 1573 JVM_END 1574 1575 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1576 assert (cls != NULL, "illegal class"); 1577 JVMWrapper("JVM_GetClassSignature"); 1578 JvmtiVMObjectAllocEventCollector oam; 1579 ResourceMark rm(THREAD); 1580 // Return null for arrays and primatives 1581 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1582 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1583 if (k->is_instance_klass()) { 1584 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1585 if (sym == NULL) return NULL; 1586 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1587 return (jstring) JNIHandles::make_local(env, str()); 1588 } 1589 } 1590 return NULL; 1591 JVM_END 1592 1593 1594 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1595 assert (cls != NULL, "illegal class"); 1596 JVMWrapper("JVM_GetClassAnnotations"); 1597 1598 // Return null for arrays and primitives 1599 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1600 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1601 if (k->is_instance_klass()) { 1602 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1603 return (jbyteArray) JNIHandles::make_local(env, a); 1604 } 1605 } 1606 return NULL; 1607 JVM_END 1608 1609 1610 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1611 // some of this code was adapted from from jni_FromReflectedField 1612 1613 oop reflected = JNIHandles::resolve_non_null(field); 1614 oop mirror = java_lang_reflect_Field::clazz(reflected); 1615 Klass* k = java_lang_Class::as_Klass(mirror); 1616 int slot = java_lang_reflect_Field::slot(reflected); 1617 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1618 1619 KlassHandle kh(THREAD, k); 1620 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot); 1621 1622 if (modifiers & JVM_ACC_STATIC) { 1623 // for static fields we only look in the current class 1624 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) { 1625 assert(false, "cannot find static field"); 1626 return false; 1627 } 1628 } else { 1629 // for instance fields we start with the current class and work 1630 // our way up through the superclass chain 1631 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) { 1632 assert(false, "cannot find instance field"); 1633 return false; 1634 } 1635 } 1636 return true; 1637 } 1638 1639 static Method* jvm_get_method_common(jobject method) { 1640 // some of this code was adapted from from jni_FromReflectedMethod 1641 1642 oop reflected = JNIHandles::resolve_non_null(method); 1643 oop mirror = NULL; 1644 int slot = 0; 1645 1646 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1647 mirror = java_lang_reflect_Constructor::clazz(reflected); 1648 slot = java_lang_reflect_Constructor::slot(reflected); 1649 } else { 1650 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1651 "wrong type"); 1652 mirror = java_lang_reflect_Method::clazz(reflected); 1653 slot = java_lang_reflect_Method::slot(reflected); 1654 } 1655 Klass* k = java_lang_Class::as_Klass(mirror); 1656 1657 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1658 assert(m != NULL, "cannot find method"); 1659 return m; // caller has to deal with NULL in product mode 1660 } 1661 1662 /* Type use annotations support (JDK 1.8) */ 1663 1664 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1665 assert (cls != NULL, "illegal class"); 1666 JVMWrapper("JVM_GetClassTypeAnnotations"); 1667 ResourceMark rm(THREAD); 1668 // Return null for arrays and primitives 1669 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1670 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1671 if (k->is_instance_klass()) { 1672 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1673 if (type_annotations != NULL) { 1674 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1675 return (jbyteArray) JNIHandles::make_local(env, a); 1676 } 1677 } 1678 } 1679 return NULL; 1680 JVM_END 1681 1682 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1683 assert (method != NULL, "illegal method"); 1684 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1685 1686 // method is a handle to a java.lang.reflect.Method object 1687 Method* m = jvm_get_method_common(method); 1688 if (m == NULL) { 1689 return NULL; 1690 } 1691 1692 AnnotationArray* type_annotations = m->type_annotations(); 1693 if (type_annotations != NULL) { 1694 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1695 return (jbyteArray) JNIHandles::make_local(env, a); 1696 } 1697 1698 return NULL; 1699 JVM_END 1700 1701 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1702 assert (field != NULL, "illegal field"); 1703 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1704 1705 fieldDescriptor fd; 1706 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1707 if (!gotFd) { 1708 return NULL; 1709 } 1710 1711 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1712 JVM_END 1713 1714 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { 1715 if (!cp->is_within_bounds(index)) { 1716 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1717 } 1718 } 1719 1720 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1721 { 1722 JVMWrapper("JVM_GetMethodParameters"); 1723 // method is a handle to a java.lang.reflect.Method object 1724 Method* method_ptr = jvm_get_method_common(method); 1725 methodHandle mh (THREAD, method_ptr); 1726 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1727 const int num_params = mh->method_parameters_length(); 1728 1729 if (num_params < 0) { 1730 // A -1 return value from method_parameters_length means there is no 1731 // parameter data. Return null to indicate this to the reflection 1732 // API. 1733 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1734 return (jobjectArray)NULL; 1735 } else { 1736 // Otherwise, we return something up to reflection, even if it is 1737 // a zero-length array. Why? Because in some cases this can 1738 // trigger a MalformedParametersException. 1739 1740 // make sure all the symbols are properly formatted 1741 for (int i = 0; i < num_params; i++) { 1742 MethodParametersElement* params = mh->method_parameters_start(); 1743 int index = params[i].name_cp_index; 1744 bounds_check(mh->constants(), index, CHECK_NULL); 1745 1746 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1747 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1748 "Wrong type at constant pool index"); 1749 } 1750 1751 } 1752 1753 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1754 objArrayHandle result (THREAD, result_oop); 1755 1756 for (int i = 0; i < num_params; i++) { 1757 MethodParametersElement* params = mh->method_parameters_start(); 1758 // For a 0 index, give a NULL symbol 1759 Symbol* sym = 0 != params[i].name_cp_index ? 1760 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1761 int flags = params[i].flags; 1762 oop param = Reflection::new_parameter(reflected_method, i, sym, 1763 flags, CHECK_NULL); 1764 result->obj_at_put(i, param); 1765 } 1766 return (jobjectArray)JNIHandles::make_local(env, result()); 1767 } 1768 } 1769 JVM_END 1770 1771 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1772 1773 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1774 { 1775 JVMWrapper("JVM_GetClassDeclaredFields"); 1776 JvmtiVMObjectAllocEventCollector oam; 1777 1778 // Exclude primitive types and array types 1779 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1780 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1781 // Return empty array 1782 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1783 return (jobjectArray) JNIHandles::make_local(env, res); 1784 } 1785 1786 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1787 constantPoolHandle cp(THREAD, k->constants()); 1788 1789 // Ensure class is linked 1790 k->link_class(CHECK_NULL); 1791 1792 // Allocate result 1793 int num_fields; 1794 1795 if (publicOnly) { 1796 num_fields = 0; 1797 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) { 1798 if (fs.access_flags().is_public()) ++num_fields; 1799 } 1800 } else { 1801 num_fields = k->java_fields_count(); 1802 } 1803 1804 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1805 objArrayHandle result (THREAD, r); 1806 1807 int out_idx = 0; 1808 fieldDescriptor fd; 1809 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1810 if (!publicOnly || fs.access_flags().is_public()) { 1811 fd.reinitialize(k(), fs.index()); 1812 oop field = Reflection::new_field(&fd, CHECK_NULL); 1813 result->obj_at_put(out_idx, field); 1814 ++out_idx; 1815 } 1816 } 1817 assert(out_idx == num_fields, "just checking"); 1818 return (jobjectArray) JNIHandles::make_local(env, result()); 1819 } 1820 JVM_END 1821 1822 static bool select_method(methodHandle method, bool want_constructor) { 1823 if (want_constructor) { 1824 return (method->is_initializer() && !method->is_static()); 1825 } else { 1826 return (!method->is_initializer() && !method->is_overpass()); 1827 } 1828 } 1829 1830 static jobjectArray get_class_declared_methods_helper( 1831 JNIEnv *env, 1832 jclass ofClass, jboolean publicOnly, 1833 bool want_constructor, 1834 Klass* klass, TRAPS) { 1835 1836 JvmtiVMObjectAllocEventCollector oam; 1837 1838 // Exclude primitive types and array types 1839 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1840 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1841 // Return empty array 1842 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1843 return (jobjectArray) JNIHandles::make_local(env, res); 1844 } 1845 1846 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1847 1848 // Ensure class is linked 1849 k->link_class(CHECK_NULL); 1850 1851 Array<Method*>* methods = k->methods(); 1852 int methods_length = methods->length(); 1853 1854 // Save original method_idnum in case of redefinition, which can change 1855 // the idnum of obsolete methods. The new method will have the same idnum 1856 // but if we refresh the methods array, the counts will be wrong. 1857 ResourceMark rm(THREAD); 1858 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1859 int num_methods = 0; 1860 1861 for (int i = 0; i < methods_length; i++) { 1862 methodHandle method(THREAD, methods->at(i)); 1863 if (select_method(method, want_constructor)) { 1864 if (!publicOnly || method->is_public()) { 1865 idnums->push(method->method_idnum()); 1866 ++num_methods; 1867 } 1868 } 1869 } 1870 1871 // Allocate result 1872 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1873 objArrayHandle result (THREAD, r); 1874 1875 // Now just put the methods that we selected above, but go by their idnum 1876 // in case of redefinition. The methods can be redefined at any safepoint, 1877 // so above when allocating the oop array and below when creating reflect 1878 // objects. 1879 for (int i = 0; i < num_methods; i++) { 1880 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1881 if (method.is_null()) { 1882 // Method may have been deleted and seems this API can handle null 1883 // Otherwise should probably put a method that throws NSME 1884 result->obj_at_put(i, NULL); 1885 } else { 1886 oop m; 1887 if (want_constructor) { 1888 m = Reflection::new_constructor(method, CHECK_NULL); 1889 } else { 1890 m = Reflection::new_method(method, false, CHECK_NULL); 1891 } 1892 result->obj_at_put(i, m); 1893 } 1894 } 1895 1896 return (jobjectArray) JNIHandles::make_local(env, result()); 1897 } 1898 1899 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1900 { 1901 JVMWrapper("JVM_GetClassDeclaredMethods"); 1902 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1903 /*want_constructor*/ false, 1904 SystemDictionary::reflect_Method_klass(), THREAD); 1905 } 1906 JVM_END 1907 1908 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1909 { 1910 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1911 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1912 /*want_constructor*/ true, 1913 SystemDictionary::reflect_Constructor_klass(), THREAD); 1914 } 1915 JVM_END 1916 1917 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1918 { 1919 JVMWrapper("JVM_GetClassAccessFlags"); 1920 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1921 // Primitive type 1922 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1923 } 1924 1925 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1926 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1927 } 1928 JVM_END 1929 1930 1931 // Constant pool access ////////////////////////////////////////////////////////// 1932 1933 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1934 { 1935 JVMWrapper("JVM_GetClassConstantPool"); 1936 JvmtiVMObjectAllocEventCollector oam; 1937 1938 // Return null for primitives and arrays 1939 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1940 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1941 if (k->is_instance_klass()) { 1942 instanceKlassHandle k_h(THREAD, k); 1943 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1944 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1945 return JNIHandles::make_local(jcp()); 1946 } 1947 } 1948 return NULL; 1949 } 1950 JVM_END 1951 1952 1953 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1954 { 1955 JVMWrapper("JVM_ConstantPoolGetSize"); 1956 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1957 return cp->length(); 1958 } 1959 JVM_END 1960 1961 1962 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1963 { 1964 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1965 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1966 bounds_check(cp, index, CHECK_NULL); 1967 constantTag tag = cp->tag_at(index); 1968 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1969 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1970 } 1971 Klass* k = cp->klass_at(index, CHECK_NULL); 1972 return (jclass) JNIHandles::make_local(k->java_mirror()); 1973 } 1974 JVM_END 1975 1976 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1977 { 1978 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1979 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1980 bounds_check(cp, index, CHECK_NULL); 1981 constantTag tag = cp->tag_at(index); 1982 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1983 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1984 } 1985 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1986 if (k == NULL) return NULL; 1987 return (jclass) JNIHandles::make_local(k->java_mirror()); 1988 } 1989 JVM_END 1990 1991 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1992 constantTag tag = cp->tag_at(index); 1993 if (!tag.is_method() && !tag.is_interface_method()) { 1994 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1995 } 1996 int klass_ref = cp->uncached_klass_ref_index_at(index); 1997 Klass* k_o; 1998 if (force_resolution) { 1999 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2000 } else { 2001 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2002 if (k_o == NULL) return NULL; 2003 } 2004 instanceKlassHandle k(THREAD, k_o); 2005 Symbol* name = cp->uncached_name_ref_at(index); 2006 Symbol* sig = cp->uncached_signature_ref_at(index); 2007 methodHandle m (THREAD, k->find_method(name, sig)); 2008 if (m.is_null()) { 2009 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2010 } 2011 oop method; 2012 if (!m->is_initializer() || m->is_static()) { 2013 method = Reflection::new_method(m, true, CHECK_NULL); 2014 } else { 2015 method = Reflection::new_constructor(m, CHECK_NULL); 2016 } 2017 return JNIHandles::make_local(method); 2018 } 2019 2020 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2021 { 2022 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 2023 JvmtiVMObjectAllocEventCollector oam; 2024 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2025 bounds_check(cp, index, CHECK_NULL); 2026 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2027 return res; 2028 } 2029 JVM_END 2030 2031 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2032 { 2033 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2034 JvmtiVMObjectAllocEventCollector oam; 2035 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2036 bounds_check(cp, index, CHECK_NULL); 2037 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2038 return res; 2039 } 2040 JVM_END 2041 2042 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2043 constantTag tag = cp->tag_at(index); 2044 if (!tag.is_field()) { 2045 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2046 } 2047 int klass_ref = cp->uncached_klass_ref_index_at(index); 2048 Klass* k_o; 2049 if (force_resolution) { 2050 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2051 } else { 2052 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2053 if (k_o == NULL) return NULL; 2054 } 2055 instanceKlassHandle k(THREAD, k_o); 2056 Symbol* name = cp->uncached_name_ref_at(index); 2057 Symbol* sig = cp->uncached_signature_ref_at(index); 2058 fieldDescriptor fd; 2059 Klass* target_klass = k->find_field(name, sig, &fd); 2060 if (target_klass == NULL) { 2061 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2062 } 2063 oop field = Reflection::new_field(&fd, CHECK_NULL); 2064 return JNIHandles::make_local(field); 2065 } 2066 2067 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2068 { 2069 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2070 JvmtiVMObjectAllocEventCollector oam; 2071 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2072 bounds_check(cp, index, CHECK_NULL); 2073 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2074 return res; 2075 } 2076 JVM_END 2077 2078 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2079 { 2080 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2081 JvmtiVMObjectAllocEventCollector oam; 2082 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2083 bounds_check(cp, index, CHECK_NULL); 2084 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2085 return res; 2086 } 2087 JVM_END 2088 2089 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2090 { 2091 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2092 JvmtiVMObjectAllocEventCollector oam; 2093 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2094 bounds_check(cp, index, CHECK_NULL); 2095 constantTag tag = cp->tag_at(index); 2096 if (!tag.is_field_or_method()) { 2097 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2098 } 2099 int klass_ref = cp->uncached_klass_ref_index_at(index); 2100 Symbol* klass_name = cp->klass_name_at(klass_ref); 2101 Symbol* member_name = cp->uncached_name_ref_at(index); 2102 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2103 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2104 objArrayHandle dest(THREAD, dest_o); 2105 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2106 dest->obj_at_put(0, str()); 2107 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2108 dest->obj_at_put(1, str()); 2109 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2110 dest->obj_at_put(2, str()); 2111 return (jobjectArray) JNIHandles::make_local(dest()); 2112 } 2113 JVM_END 2114 2115 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2116 { 2117 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2118 JvmtiVMObjectAllocEventCollector oam; 2119 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2120 bounds_check(cp, index, CHECK_0); 2121 constantTag tag = cp->tag_at(index); 2122 if (!tag.is_field_or_method()) { 2123 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2124 } 2125 return (jint) cp->uncached_klass_ref_index_at(index); 2126 } 2127 JVM_END 2128 2129 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2130 { 2131 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2132 JvmtiVMObjectAllocEventCollector oam; 2133 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2134 bounds_check(cp, index, CHECK_0); 2135 constantTag tag = cp->tag_at(index); 2136 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2137 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2138 } 2139 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2140 } 2141 JVM_END 2142 2143 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2144 { 2145 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2146 JvmtiVMObjectAllocEventCollector oam; 2147 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2148 bounds_check(cp, index, CHECK_NULL); 2149 constantTag tag = cp->tag_at(index); 2150 if (!tag.is_name_and_type()) { 2151 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2152 } 2153 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2154 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2155 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2156 objArrayHandle dest(THREAD, dest_o); 2157 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2158 dest->obj_at_put(0, str()); 2159 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2160 dest->obj_at_put(1, str()); 2161 return (jobjectArray) JNIHandles::make_local(dest()); 2162 } 2163 JVM_END 2164 2165 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2166 { 2167 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2168 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2169 bounds_check(cp, index, CHECK_0); 2170 constantTag tag = cp->tag_at(index); 2171 if (!tag.is_int()) { 2172 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2173 } 2174 return cp->int_at(index); 2175 } 2176 JVM_END 2177 2178 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2179 { 2180 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2181 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2182 bounds_check(cp, index, CHECK_(0L)); 2183 constantTag tag = cp->tag_at(index); 2184 if (!tag.is_long()) { 2185 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2186 } 2187 return cp->long_at(index); 2188 } 2189 JVM_END 2190 2191 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2192 { 2193 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2194 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2195 bounds_check(cp, index, CHECK_(0.0f)); 2196 constantTag tag = cp->tag_at(index); 2197 if (!tag.is_float()) { 2198 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2199 } 2200 return cp->float_at(index); 2201 } 2202 JVM_END 2203 2204 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2205 { 2206 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2207 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2208 bounds_check(cp, index, CHECK_(0.0)); 2209 constantTag tag = cp->tag_at(index); 2210 if (!tag.is_double()) { 2211 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2212 } 2213 return cp->double_at(index); 2214 } 2215 JVM_END 2216 2217 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2218 { 2219 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2220 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2221 bounds_check(cp, index, CHECK_NULL); 2222 constantTag tag = cp->tag_at(index); 2223 if (!tag.is_string()) { 2224 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2225 } 2226 oop str = cp->string_at(index, CHECK_NULL); 2227 return (jstring) JNIHandles::make_local(str); 2228 } 2229 JVM_END 2230 2231 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2232 { 2233 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2234 JvmtiVMObjectAllocEventCollector oam; 2235 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2236 bounds_check(cp, index, CHECK_NULL); 2237 constantTag tag = cp->tag_at(index); 2238 if (!tag.is_symbol()) { 2239 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2240 } 2241 Symbol* sym = cp->symbol_at(index); 2242 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2243 return (jstring) JNIHandles::make_local(str()); 2244 } 2245 JVM_END 2246 2247 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2248 { 2249 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2250 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2251 bounds_check(cp, index, CHECK_0); 2252 constantTag tag = cp->tag_at(index); 2253 jbyte result = tag.value(); 2254 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2255 // they are changed to the corresponding tags from the JVM spec, so that java code in 2256 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2257 if (tag.is_klass_or_reference()) { 2258 result = JVM_CONSTANT_Class; 2259 } else if (tag.is_string_index()) { 2260 result = JVM_CONSTANT_String; 2261 } else if (tag.is_method_type_in_error()) { 2262 result = JVM_CONSTANT_MethodType; 2263 } else if (tag.is_method_handle_in_error()) { 2264 result = JVM_CONSTANT_MethodHandle; 2265 } 2266 return result; 2267 } 2268 JVM_END 2269 2270 // Assertion support. ////////////////////////////////////////////////////////// 2271 2272 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2273 JVMWrapper("JVM_DesiredAssertionStatus"); 2274 assert(cls != NULL, "bad class"); 2275 2276 oop r = JNIHandles::resolve(cls); 2277 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2278 if (java_lang_Class::is_primitive(r)) return false; 2279 2280 Klass* k = java_lang_Class::as_Klass(r); 2281 assert(k->is_instance_klass(), "must be an instance klass"); 2282 if (!k->is_instance_klass()) return false; 2283 2284 ResourceMark rm(THREAD); 2285 const char* name = k->name()->as_C_string(); 2286 bool system_class = k->class_loader() == NULL; 2287 return JavaAssertions::enabled(name, system_class); 2288 2289 JVM_END 2290 2291 2292 // Return a new AssertionStatusDirectives object with the fields filled in with 2293 // command-line assertion arguments (i.e., -ea, -da). 2294 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2295 JVMWrapper("JVM_AssertionStatusDirectives"); 2296 JvmtiVMObjectAllocEventCollector oam; 2297 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2298 return JNIHandles::make_local(env, asd); 2299 JVM_END 2300 2301 // Verification //////////////////////////////////////////////////////////////////////////////// 2302 2303 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2304 2305 // RedefineClasses support: bug 6214132 caused verification to fail. 2306 // All functions from this section should call the jvmtiThreadSate function: 2307 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2308 // The function returns a Klass* of the _scratch_class if the verifier 2309 // was invoked in the middle of the class redefinition. 2310 // Otherwise it returns its argument value which is the _the_class Klass*. 2311 // Please, refer to the description in the jvmtiThreadSate.hpp. 2312 2313 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2314 JVMWrapper("JVM_GetClassNameUTF"); 2315 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2316 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2317 return k->name()->as_utf8(); 2318 JVM_END 2319 2320 2321 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2322 JVMWrapper("JVM_GetClassCPTypes"); 2323 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2324 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2325 // types will have length zero if this is not an InstanceKlass 2326 // (length is determined by call to JVM_GetClassCPEntriesCount) 2327 if (k->is_instance_klass()) { 2328 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2329 for (int index = cp->length() - 1; index >= 0; index--) { 2330 constantTag tag = cp->tag_at(index); 2331 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2332 } 2333 } 2334 JVM_END 2335 2336 2337 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2338 JVMWrapper("JVM_GetClassCPEntriesCount"); 2339 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2340 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2341 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2342 JVM_END 2343 2344 2345 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2346 JVMWrapper("JVM_GetClassFieldsCount"); 2347 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2348 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2349 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2350 JVM_END 2351 2352 2353 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2354 JVMWrapper("JVM_GetClassMethodsCount"); 2355 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2356 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2357 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2358 JVM_END 2359 2360 2361 // The following methods, used for the verifier, are never called with 2362 // array klasses, so a direct cast to InstanceKlass is safe. 2363 // Typically, these methods are called in a loop with bounds determined 2364 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2365 // zero for arrays. 2366 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2367 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2368 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2369 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2370 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2371 int length = method->checked_exceptions_length(); 2372 if (length > 0) { 2373 CheckedExceptionElement* table= method->checked_exceptions_start(); 2374 for (int i = 0; i < length; i++) { 2375 exceptions[i] = table[i].class_cp_index; 2376 } 2377 } 2378 JVM_END 2379 2380 2381 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2382 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2383 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2384 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2385 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2386 return method->checked_exceptions_length(); 2387 JVM_END 2388 2389 2390 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2391 JVMWrapper("JVM_GetMethodIxByteCode"); 2392 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2393 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2394 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2395 memcpy(code, method->code_base(), method->code_size()); 2396 JVM_END 2397 2398 2399 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2400 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2401 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2402 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2403 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2404 return method->code_size(); 2405 JVM_END 2406 2407 2408 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2409 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2410 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2411 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2412 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2413 ExceptionTable extable(method); 2414 entry->start_pc = extable.start_pc(entry_index); 2415 entry->end_pc = extable.end_pc(entry_index); 2416 entry->handler_pc = extable.handler_pc(entry_index); 2417 entry->catchType = extable.catch_type_index(entry_index); 2418 JVM_END 2419 2420 2421 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2422 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2423 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2424 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2425 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2426 return method->exception_table_length(); 2427 JVM_END 2428 2429 2430 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2431 JVMWrapper("JVM_GetMethodIxModifiers"); 2432 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2433 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2434 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2435 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2436 JVM_END 2437 2438 2439 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2440 JVMWrapper("JVM_GetFieldIxModifiers"); 2441 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2442 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2443 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2444 JVM_END 2445 2446 2447 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2448 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2449 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2450 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2451 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2452 return method->max_locals(); 2453 JVM_END 2454 2455 2456 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2457 JVMWrapper("JVM_GetMethodIxArgsSize"); 2458 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2459 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2460 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2461 return method->size_of_parameters(); 2462 JVM_END 2463 2464 2465 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2466 JVMWrapper("JVM_GetMethodIxMaxStack"); 2467 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2468 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2469 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2470 return method->verifier_max_stack(); 2471 JVM_END 2472 2473 2474 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2475 JVMWrapper("JVM_IsConstructorIx"); 2476 ResourceMark rm(THREAD); 2477 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2478 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2479 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2480 return method->name() == vmSymbols::object_initializer_name(); 2481 JVM_END 2482 2483 2484 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2485 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2486 ResourceMark rm(THREAD); 2487 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2488 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2489 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2490 return method->is_overpass(); 2491 JVM_END 2492 2493 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2494 JVMWrapper("JVM_GetMethodIxIxUTF"); 2495 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2496 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2497 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2498 return method->name()->as_utf8(); 2499 JVM_END 2500 2501 2502 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2503 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2504 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2505 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2506 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2507 return method->signature()->as_utf8(); 2508 JVM_END 2509 2510 /** 2511 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2512 * read entries in the constant pool. Since the old verifier always 2513 * works on a copy of the code, it will not see any rewriting that 2514 * may possibly occur in the middle of verification. So it is important 2515 * that nothing it calls tries to use the cpCache instead of the raw 2516 * constant pool, so we must use cp->uncached_x methods when appropriate. 2517 */ 2518 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2519 JVMWrapper("JVM_GetCPFieldNameUTF"); 2520 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2521 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2522 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2523 switch (cp->tag_at(cp_index).value()) { 2524 case JVM_CONSTANT_Fieldref: 2525 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2526 default: 2527 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2528 } 2529 ShouldNotReachHere(); 2530 return NULL; 2531 JVM_END 2532 2533 2534 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2535 JVMWrapper("JVM_GetCPMethodNameUTF"); 2536 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2537 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2538 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2539 switch (cp->tag_at(cp_index).value()) { 2540 case JVM_CONSTANT_InterfaceMethodref: 2541 case JVM_CONSTANT_Methodref: 2542 case JVM_CONSTANT_NameAndType: // for invokedynamic 2543 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2544 default: 2545 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2546 } 2547 ShouldNotReachHere(); 2548 return NULL; 2549 JVM_END 2550 2551 2552 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2553 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2554 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2555 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2556 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2557 switch (cp->tag_at(cp_index).value()) { 2558 case JVM_CONSTANT_InterfaceMethodref: 2559 case JVM_CONSTANT_Methodref: 2560 case JVM_CONSTANT_NameAndType: // for invokedynamic 2561 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2562 default: 2563 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2564 } 2565 ShouldNotReachHere(); 2566 return NULL; 2567 JVM_END 2568 2569 2570 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2571 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2572 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2573 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2574 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2575 switch (cp->tag_at(cp_index).value()) { 2576 case JVM_CONSTANT_Fieldref: 2577 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2578 default: 2579 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2580 } 2581 ShouldNotReachHere(); 2582 return NULL; 2583 JVM_END 2584 2585 2586 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2587 JVMWrapper("JVM_GetCPClassNameUTF"); 2588 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2589 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2590 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2591 Symbol* classname = cp->klass_name_at(cp_index); 2592 return classname->as_utf8(); 2593 JVM_END 2594 2595 2596 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2597 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2598 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2599 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2600 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2601 switch (cp->tag_at(cp_index).value()) { 2602 case JVM_CONSTANT_Fieldref: { 2603 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2604 Symbol* classname = cp->klass_name_at(class_index); 2605 return classname->as_utf8(); 2606 } 2607 default: 2608 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2609 } 2610 ShouldNotReachHere(); 2611 return NULL; 2612 JVM_END 2613 2614 2615 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2616 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2617 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2618 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2619 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2620 switch (cp->tag_at(cp_index).value()) { 2621 case JVM_CONSTANT_Methodref: 2622 case JVM_CONSTANT_InterfaceMethodref: { 2623 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2624 Symbol* classname = cp->klass_name_at(class_index); 2625 return classname->as_utf8(); 2626 } 2627 default: 2628 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2629 } 2630 ShouldNotReachHere(); 2631 return NULL; 2632 JVM_END 2633 2634 2635 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2636 JVMWrapper("JVM_GetCPFieldModifiers"); 2637 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2638 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2639 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2640 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2641 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2642 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2643 switch (cp->tag_at(cp_index).value()) { 2644 case JVM_CONSTANT_Fieldref: { 2645 Symbol* name = cp->uncached_name_ref_at(cp_index); 2646 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2647 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) { 2648 if (fs.name() == name && fs.signature() == signature) { 2649 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2650 } 2651 } 2652 return -1; 2653 } 2654 default: 2655 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2656 } 2657 ShouldNotReachHere(); 2658 return 0; 2659 JVM_END 2660 2661 2662 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2663 JVMWrapper("JVM_GetCPMethodModifiers"); 2664 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2665 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2666 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2667 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2668 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2669 switch (cp->tag_at(cp_index).value()) { 2670 case JVM_CONSTANT_Methodref: 2671 case JVM_CONSTANT_InterfaceMethodref: { 2672 Symbol* name = cp->uncached_name_ref_at(cp_index); 2673 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2674 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2675 int methods_count = methods->length(); 2676 for (int i = 0; i < methods_count; i++) { 2677 Method* method = methods->at(i); 2678 if (method->name() == name && method->signature() == signature) { 2679 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2680 } 2681 } 2682 return -1; 2683 } 2684 default: 2685 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2686 } 2687 ShouldNotReachHere(); 2688 return 0; 2689 JVM_END 2690 2691 2692 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2693 2694 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2695 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2696 JVM_END 2697 2698 2699 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2700 JVMWrapper("JVM_IsSameClassPackage"); 2701 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2702 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2703 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2704 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2705 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2706 JVM_END 2707 2708 // Printing support ////////////////////////////////////////////////// 2709 extern "C" { 2710 2711 ATTRIBUTE_PRINTF(3, 0) 2712 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2713 // see bug 4399518, 4417214 2714 if ((intptr_t)count <= 0) return -1; 2715 2716 int result = vsnprintf(str, count, fmt, args); 2717 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2718 // characters which would have been written had the buffer been large 2719 // enough; on Windows, it returns -1. We handle both cases here and 2720 // always return -1, and perform null termination. 2721 if ((result > 0 && (size_t)result >= count) || result == -1) { 2722 str[count - 1] = '\0'; 2723 result = -1; 2724 } 2725 2726 return result; 2727 } 2728 2729 ATTRIBUTE_PRINTF(3, 0) 2730 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2731 va_list args; 2732 int len; 2733 va_start(args, fmt); 2734 len = jio_vsnprintf(str, count, fmt, args); 2735 va_end(args); 2736 return len; 2737 } 2738 2739 ATTRIBUTE_PRINTF(2,3) 2740 int jio_fprintf(FILE* f, const char *fmt, ...) { 2741 int len; 2742 va_list args; 2743 va_start(args, fmt); 2744 len = jio_vfprintf(f, fmt, args); 2745 va_end(args); 2746 return len; 2747 } 2748 2749 ATTRIBUTE_PRINTF(2, 0) 2750 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2751 if (Arguments::vfprintf_hook() != NULL) { 2752 return Arguments::vfprintf_hook()(f, fmt, args); 2753 } else { 2754 return vfprintf(f, fmt, args); 2755 } 2756 } 2757 2758 ATTRIBUTE_PRINTF(1, 2) 2759 JNIEXPORT int jio_printf(const char *fmt, ...) { 2760 int len; 2761 va_list args; 2762 va_start(args, fmt); 2763 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2764 va_end(args); 2765 return len; 2766 } 2767 2768 2769 // HotSpot specific jio method 2770 void jio_print(const char* s) { 2771 // Try to make this function as atomic as possible. 2772 if (Arguments::vfprintf_hook() != NULL) { 2773 jio_fprintf(defaultStream::output_stream(), "%s", s); 2774 } else { 2775 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2776 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2777 } 2778 } 2779 2780 } // Extern C 2781 2782 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2783 2784 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 2785 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or 2786 // OSThread objects. The exception to this rule is when the target object is the thread 2787 // doing the operation, in which case we know that the thread won't exit until the 2788 // operation is done (all exits being voluntary). There are a few cases where it is 2789 // rather silly to do operations on yourself, like resuming yourself or asking whether 2790 // you are alive. While these can still happen, they are not subject to deadlocks if 2791 // the lock is held while the operation occurs (this is not the case for suspend, for 2792 // instance), and are very unlikely. Because IsAlive needs to be fast and its 2793 // implementation is local to this file, we always lock Threads_lock for that one. 2794 2795 static void thread_entry(JavaThread* thread, TRAPS) { 2796 HandleMark hm(THREAD); 2797 Handle obj(THREAD, thread->threadObj()); 2798 JavaValue result(T_VOID); 2799 JavaCalls::call_virtual(&result, 2800 obj, 2801 KlassHandle(THREAD, SystemDictionary::Thread_klass()), 2802 vmSymbols::run_method_name(), 2803 vmSymbols::void_method_signature(), 2804 THREAD); 2805 } 2806 2807 2808 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2809 JVMWrapper("JVM_StartThread"); 2810 JavaThread *native_thread = NULL; 2811 2812 // We cannot hold the Threads_lock when we throw an exception, 2813 // due to rank ordering issues. Example: we might need to grab the 2814 // Heap_lock while we construct the exception. 2815 bool throw_illegal_thread_state = false; 2816 2817 // We must release the Threads_lock before we can post a jvmti event 2818 // in Thread::start. 2819 { 2820 // Ensure that the C++ Thread and OSThread structures aren't freed before 2821 // we operate. 2822 MutexLocker mu(Threads_lock); 2823 2824 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2825 // re-starting an already started thread, so we should usually find 2826 // that the JavaThread is null. However for a JNI attached thread 2827 // there is a small window between the Thread object being created 2828 // (with its JavaThread set) and the update to its threadStatus, so we 2829 // have to check for this 2830 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2831 throw_illegal_thread_state = true; 2832 } else { 2833 // We could also check the stillborn flag to see if this thread was already stopped, but 2834 // for historical reasons we let the thread detect that itself when it starts running 2835 2836 jlong size = 2837 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2838 // Allocate the C++ Thread structure and create the native thread. The 2839 // stack size retrieved from java is signed, but the constructor takes 2840 // size_t (an unsigned type), so avoid passing negative values which would 2841 // result in really large stacks. 2842 size_t sz = size > 0 ? (size_t) size : 0; 2843 native_thread = new JavaThread(&thread_entry, sz); 2844 2845 // At this point it may be possible that no osthread was created for the 2846 // JavaThread due to lack of memory. Check for this situation and throw 2847 // an exception if necessary. Eventually we may want to change this so 2848 // that we only grab the lock if the thread was created successfully - 2849 // then we can also do this check and throw the exception in the 2850 // JavaThread constructor. 2851 if (native_thread->osthread() != NULL) { 2852 // Note: the current thread is not being used within "prepare". 2853 native_thread->prepare(jthread); 2854 } 2855 } 2856 } 2857 2858 if (throw_illegal_thread_state) { 2859 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2860 } 2861 2862 assert(native_thread != NULL, "Starting null thread?"); 2863 2864 if (native_thread->osthread() == NULL) { 2865 // No one should hold a reference to the 'native_thread'. 2866 delete native_thread; 2867 if (JvmtiExport::should_post_resource_exhausted()) { 2868 JvmtiExport::post_resource_exhausted( 2869 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2870 os::native_thread_creation_failed_msg()); 2871 } 2872 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2873 os::native_thread_creation_failed_msg()); 2874 } 2875 2876 Thread::start(native_thread); 2877 2878 JVM_END 2879 2880 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2881 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2882 // but is thought to be reliable and simple. In the case, where the receiver is the 2883 // same thread as the sender, no safepoint is needed. 2884 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2885 JVMWrapper("JVM_StopThread"); 2886 2887 oop java_throwable = JNIHandles::resolve(throwable); 2888 if (java_throwable == NULL) { 2889 THROW(vmSymbols::java_lang_NullPointerException()); 2890 } 2891 oop java_thread = JNIHandles::resolve_non_null(jthread); 2892 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2893 Events::log_exception(JavaThread::current(), 2894 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2895 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2896 // First check if thread is alive 2897 if (receiver != NULL) { 2898 // Check if exception is getting thrown at self (use oop equality, since the 2899 // target object might exit) 2900 if (java_thread == thread->threadObj()) { 2901 THROW_OOP(java_throwable); 2902 } else { 2903 // Enques a VM_Operation to stop all threads and then deliver the exception... 2904 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 2905 } 2906 } 2907 else { 2908 // Either: 2909 // - target thread has not been started before being stopped, or 2910 // - target thread already terminated 2911 // We could read the threadStatus to determine which case it is 2912 // but that is overkill as it doesn't matter. We must set the 2913 // stillborn flag for the first case, and if the thread has already 2914 // exited setting this flag has no affect 2915 java_lang_Thread::set_stillborn(java_thread); 2916 } 2917 JVM_END 2918 2919 2920 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2921 JVMWrapper("JVM_IsThreadAlive"); 2922 2923 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2924 return java_lang_Thread::is_alive(thread_oop); 2925 JVM_END 2926 2927 2928 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2929 JVMWrapper("JVM_SuspendThread"); 2930 oop java_thread = JNIHandles::resolve_non_null(jthread); 2931 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2932 2933 if (receiver != NULL) { 2934 // thread has run and has not exited (still on threads list) 2935 2936 { 2937 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2938 if (receiver->is_external_suspend()) { 2939 // Don't allow nested external suspend requests. We can't return 2940 // an error from this interface so just ignore the problem. 2941 return; 2942 } 2943 if (receiver->is_exiting()) { // thread is in the process of exiting 2944 return; 2945 } 2946 receiver->set_external_suspend(); 2947 } 2948 2949 // java_suspend() will catch threads in the process of exiting 2950 // and will ignore them. 2951 receiver->java_suspend(); 2952 2953 // It would be nice to have the following assertion in all the 2954 // time, but it is possible for a racing resume request to have 2955 // resumed this thread right after we suspended it. Temporarily 2956 // enable this assertion if you are chasing a different kind of 2957 // bug. 2958 // 2959 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2960 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2961 } 2962 JVM_END 2963 2964 2965 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2966 JVMWrapper("JVM_ResumeThread"); 2967 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 2968 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2969 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2970 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2971 // looks at it. 2972 MutexLocker ml(Threads_lock); 2973 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2974 if (thr != NULL) { 2975 // the thread has run and is not in the process of exiting 2976 thr->java_resume(); 2977 } 2978 JVM_END 2979 2980 2981 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2982 JVMWrapper("JVM_SetThreadPriority"); 2983 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2984 MutexLocker ml(Threads_lock); 2985 oop java_thread = JNIHandles::resolve_non_null(jthread); 2986 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2987 JavaThread* thr = java_lang_Thread::thread(java_thread); 2988 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 2989 Thread::set_priority(thr, (ThreadPriority)prio); 2990 } 2991 JVM_END 2992 2993 2994 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2995 JVMWrapper("JVM_Yield"); 2996 if (os::dont_yield()) return; 2997 HOTSPOT_THREAD_YIELD(); 2998 2999 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield. 3000 // Critical for similar threading behaviour 3001 if (ConvertYieldToSleep) { 3002 os::sleep(thread, MinSleepInterval, false); 3003 } else { 3004 os::naked_yield(); 3005 } 3006 JVM_END 3007 3008 3009 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3010 JVMWrapper("JVM_Sleep"); 3011 3012 if (millis < 0) { 3013 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3014 } 3015 3016 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 3017 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3018 } 3019 3020 // Save current thread state and restore it at the end of this block. 3021 // And set new thread state to SLEEPING. 3022 JavaThreadSleepState jtss(thread); 3023 3024 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3025 3026 EventThreadSleep event; 3027 3028 if (millis == 0) { 3029 // When ConvertSleepToYield is on, this matches the classic VM implementation of 3030 // JVM_Sleep. Critical for similar threading behaviour (Win32) 3031 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep 3032 // for SOLARIS 3033 if (ConvertSleepToYield) { 3034 os::naked_yield(); 3035 } else { 3036 ThreadState old_state = thread->osthread()->get_state(); 3037 thread->osthread()->set_state(SLEEPING); 3038 os::sleep(thread, MinSleepInterval, false); 3039 thread->osthread()->set_state(old_state); 3040 } 3041 } else { 3042 ThreadState old_state = thread->osthread()->get_state(); 3043 thread->osthread()->set_state(SLEEPING); 3044 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3045 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3046 // us while we were sleeping. We do not overwrite those. 3047 if (!HAS_PENDING_EXCEPTION) { 3048 if (event.should_commit()) { 3049 event.set_time(millis); 3050 event.commit(); 3051 } 3052 HOTSPOT_THREAD_SLEEP_END(1); 3053 3054 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3055 // to properly restore the thread state. That's likely wrong. 3056 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3057 } 3058 } 3059 thread->osthread()->set_state(old_state); 3060 } 3061 if (event.should_commit()) { 3062 event.set_time(millis); 3063 event.commit(); 3064 } 3065 HOTSPOT_THREAD_SLEEP_END(0); 3066 JVM_END 3067 3068 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3069 JVMWrapper("JVM_CurrentThread"); 3070 oop jthread = thread->threadObj(); 3071 assert (thread != NULL, "no current thread!"); 3072 return JNIHandles::make_local(env, jthread); 3073 JVM_END 3074 3075 3076 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3077 JVMWrapper("JVM_CountStackFrames"); 3078 3079 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3080 oop java_thread = JNIHandles::resolve_non_null(jthread); 3081 bool throw_illegal_thread_state = false; 3082 int count = 0; 3083 3084 { 3085 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3086 // We need to re-resolve the java_thread, since a GC might have happened during the 3087 // acquire of the lock 3088 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3089 3090 if (thr == NULL) { 3091 // do nothing 3092 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 3093 // Check whether this java thread has been suspended already. If not, throws 3094 // IllegalThreadStateException. We defer to throw that exception until 3095 // Threads_lock is released since loading exception class has to leave VM. 3096 // The correct way to test a thread is actually suspended is 3097 // wait_for_ext_suspend_completion(), but we can't call that while holding 3098 // the Threads_lock. The above tests are sufficient for our purposes 3099 // provided the walkability of the stack is stable - which it isn't 3100 // 100% but close enough for most practical purposes. 3101 throw_illegal_thread_state = true; 3102 } else { 3103 // Count all java activation, i.e., number of vframes 3104 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 3105 // Native frames are not counted 3106 if (!vfst.method()->is_native()) count++; 3107 } 3108 } 3109 } 3110 3111 if (throw_illegal_thread_state) { 3112 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3113 "this thread is not suspended"); 3114 } 3115 return count; 3116 JVM_END 3117 3118 // Consider: A better way to implement JVM_Interrupt() is to acquire 3119 // Threads_lock to resolve the jthread into a Thread pointer, fetch 3120 // Thread->platformevent, Thread->native_thr, Thread->parker, etc., 3121 // drop Threads_lock, and the perform the unpark() and thr_kill() operations 3122 // outside the critical section. Threads_lock is hot so we want to minimize 3123 // the hold-time. A cleaner interface would be to decompose interrupt into 3124 // two steps. The 1st phase, performed under Threads_lock, would return 3125 // a closure that'd be invoked after Threads_lock was dropped. 3126 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 3127 // admit spurious wakeups. 3128 3129 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3130 JVMWrapper("JVM_Interrupt"); 3131 3132 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3133 oop java_thread = JNIHandles::resolve_non_null(jthread); 3134 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3135 // We need to re-resolve the java_thread, since a GC might have happened during the 3136 // acquire of the lock 3137 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3138 if (thr != NULL) { 3139 Thread::interrupt(thr); 3140 } 3141 JVM_END 3142 3143 3144 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3145 JVMWrapper("JVM_IsInterrupted"); 3146 3147 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3148 oop java_thread = JNIHandles::resolve_non_null(jthread); 3149 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3150 // We need to re-resolve the java_thread, since a GC might have happened during the 3151 // acquire of the lock 3152 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3153 if (thr == NULL) { 3154 return JNI_FALSE; 3155 } else { 3156 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3157 } 3158 JVM_END 3159 3160 3161 // Return true iff the current thread has locked the object passed in 3162 3163 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3164 JVMWrapper("JVM_HoldsLock"); 3165 assert(THREAD->is_Java_thread(), "sanity check"); 3166 if (obj == NULL) { 3167 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3168 } 3169 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3170 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3171 JVM_END 3172 3173 3174 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3175 JVMWrapper("JVM_DumpAllStacks"); 3176 VM_PrintThreads op; 3177 VMThread::execute(&op); 3178 if (JvmtiExport::should_post_data_dump()) { 3179 JvmtiExport::post_data_dump(); 3180 } 3181 JVM_END 3182 3183 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3184 JVMWrapper("JVM_SetNativeThreadName"); 3185 ResourceMark rm(THREAD); 3186 oop java_thread = JNIHandles::resolve_non_null(jthread); 3187 JavaThread* thr = java_lang_Thread::thread(java_thread); 3188 // Thread naming only supported for the current thread, doesn't work for 3189 // target threads. 3190 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3191 // we don't set the name of an attached thread to avoid stepping 3192 // on other programs 3193 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3194 os::set_native_thread_name(thread_name); 3195 } 3196 JVM_END 3197 3198 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3199 3200 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3201 assert(jthread->is_Java_thread(), "must be a Java thread"); 3202 if (jthread->privileged_stack_top() == NULL) return false; 3203 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3204 oop loader = jthread->privileged_stack_top()->class_loader(); 3205 if (loader == NULL) return true; 3206 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3207 if (trusted) return true; 3208 } 3209 return false; 3210 } 3211 3212 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3213 JVMWrapper("JVM_CurrentLoadedClass"); 3214 ResourceMark rm(THREAD); 3215 3216 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3217 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3218 bool trusted = is_trusted_frame(thread, &vfst); 3219 if (trusted) return NULL; 3220 3221 Method* m = vfst.method(); 3222 if (!m->is_native()) { 3223 InstanceKlass* holder = m->method_holder(); 3224 oop loader = holder->class_loader(); 3225 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3226 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3227 } 3228 } 3229 } 3230 return NULL; 3231 JVM_END 3232 3233 3234 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3235 JVMWrapper("JVM_CurrentClassLoader"); 3236 ResourceMark rm(THREAD); 3237 3238 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3239 3240 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3241 bool trusted = is_trusted_frame(thread, &vfst); 3242 if (trusted) return NULL; 3243 3244 Method* m = vfst.method(); 3245 if (!m->is_native()) { 3246 InstanceKlass* holder = m->method_holder(); 3247 assert(holder->is_klass(), "just checking"); 3248 oop loader = holder->class_loader(); 3249 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3250 return JNIHandles::make_local(env, loader); 3251 } 3252 } 3253 } 3254 return NULL; 3255 JVM_END 3256 3257 3258 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3259 JVMWrapper("JVM_GetClassContext"); 3260 ResourceMark rm(THREAD); 3261 JvmtiVMObjectAllocEventCollector oam; 3262 vframeStream vfst(thread); 3263 3264 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3265 // This must only be called from SecurityManager.getClassContext 3266 Method* m = vfst.method(); 3267 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3268 m->name() == vmSymbols::getClassContext_name() && 3269 m->signature() == vmSymbols::void_class_array_signature())) { 3270 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3271 } 3272 } 3273 3274 // Collect method holders 3275 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>(); 3276 for (; !vfst.at_end(); vfst.security_next()) { 3277 Method* m = vfst.method(); 3278 // Native frames are not returned 3279 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3280 Klass* holder = m->method_holder(); 3281 assert(holder->is_klass(), "just checking"); 3282 klass_array->append(holder); 3283 } 3284 } 3285 3286 // Create result array of type [Ljava/lang/Class; 3287 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3288 // Fill in mirrors corresponding to method holders 3289 for (int i = 0; i < klass_array->length(); i++) { 3290 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3291 } 3292 3293 return (jobjectArray) JNIHandles::make_local(env, result); 3294 JVM_END 3295 3296 3297 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3298 JVMWrapper("JVM_ClassDepth"); 3299 ResourceMark rm(THREAD); 3300 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3301 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3302 3303 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3304 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3305 if (class_name_sym == NULL) { 3306 return -1; 3307 } 3308 3309 int depth = 0; 3310 3311 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3312 if (!vfst.method()->is_native()) { 3313 InstanceKlass* holder = vfst.method()->method_holder(); 3314 assert(holder->is_klass(), "just checking"); 3315 if (holder->name() == class_name_sym) { 3316 return depth; 3317 } 3318 depth++; 3319 } 3320 } 3321 return -1; 3322 JVM_END 3323 3324 3325 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3326 JVMWrapper("JVM_ClassLoaderDepth"); 3327 ResourceMark rm(THREAD); 3328 int depth = 0; 3329 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3330 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3331 bool trusted = is_trusted_frame(thread, &vfst); 3332 if (trusted) return -1; 3333 3334 Method* m = vfst.method(); 3335 if (!m->is_native()) { 3336 InstanceKlass* holder = m->method_holder(); 3337 assert(holder->is_klass(), "just checking"); 3338 oop loader = holder->class_loader(); 3339 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3340 return depth; 3341 } 3342 depth++; 3343 } 3344 } 3345 return -1; 3346 JVM_END 3347 3348 3349 // java.lang.Package //////////////////////////////////////////////////////////////// 3350 3351 3352 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3353 JVMWrapper("JVM_GetSystemPackage"); 3354 ResourceMark rm(THREAD); 3355 JvmtiVMObjectAllocEventCollector oam; 3356 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3357 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3358 return (jstring) JNIHandles::make_local(result); 3359 JVM_END 3360 3361 3362 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3363 JVMWrapper("JVM_GetSystemPackages"); 3364 JvmtiVMObjectAllocEventCollector oam; 3365 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3366 return (jobjectArray) JNIHandles::make_local(result); 3367 JVM_END 3368 3369 3370 // ObjectInputStream /////////////////////////////////////////////////////////////// 3371 3372 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3373 if (current_class == NULL) { 3374 return true; 3375 } 3376 if ((current_class == field_class) || access.is_public()) { 3377 return true; 3378 } 3379 3380 if (access.is_protected()) { 3381 // See if current_class is a subclass of field_class 3382 if (current_class->is_subclass_of(field_class)) { 3383 return true; 3384 } 3385 } 3386 3387 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3388 } 3389 3390 // Return the first user-defined class loader up the execution stack, or null 3391 // if only code from the bootstrap or platform class loader is on the stack. 3392 3393 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3394 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3395 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3396 oop loader = vfst.method()->method_holder()->class_loader(); 3397 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3398 return JNIHandles::make_local(env, loader); 3399 } 3400 } 3401 return NULL; 3402 JVM_END 3403 3404 3405 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3406 3407 3408 // resolve array handle and check arguments 3409 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3410 if (arr == NULL) { 3411 THROW_0(vmSymbols::java_lang_NullPointerException()); 3412 } 3413 oop a = JNIHandles::resolve_non_null(arr); 3414 if (!a->is_array()) { 3415 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3416 } else if (type_array_only && !a->is_typeArray()) { 3417 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3418 } 3419 return arrayOop(a); 3420 } 3421 3422 3423 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3424 JVMWrapper("JVM_GetArrayLength"); 3425 arrayOop a = check_array(env, arr, false, CHECK_0); 3426 return a->length(); 3427 JVM_END 3428 3429 3430 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3431 JVMWrapper("JVM_Array_Get"); 3432 JvmtiVMObjectAllocEventCollector oam; 3433 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3434 jvalue value; 3435 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3436 oop box = Reflection::box(&value, type, CHECK_NULL); 3437 return JNIHandles::make_local(env, box); 3438 JVM_END 3439 3440 3441 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3442 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3443 jvalue value; 3444 value.i = 0; // to initialize value before getting used in CHECK 3445 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3446 assert(a->is_typeArray(), "just checking"); 3447 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3448 BasicType wide_type = (BasicType) wCode; 3449 if (type != wide_type) { 3450 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3451 } 3452 return value; 3453 JVM_END 3454 3455 3456 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3457 JVMWrapper("JVM_SetArrayElement"); 3458 arrayOop a = check_array(env, arr, false, CHECK); 3459 oop box = JNIHandles::resolve(val); 3460 jvalue value; 3461 value.i = 0; // to initialize value before getting used in CHECK 3462 BasicType value_type; 3463 if (a->is_objArray()) { 3464 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3465 value_type = Reflection::unbox_for_regular_object(box, &value); 3466 } else { 3467 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3468 } 3469 Reflection::array_set(&value, a, index, value_type, CHECK); 3470 JVM_END 3471 3472 3473 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3474 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3475 arrayOop a = check_array(env, arr, true, CHECK); 3476 assert(a->is_typeArray(), "just checking"); 3477 BasicType value_type = (BasicType) vCode; 3478 Reflection::array_set(&v, a, index, value_type, CHECK); 3479 JVM_END 3480 3481 3482 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3483 JVMWrapper("JVM_NewArray"); 3484 JvmtiVMObjectAllocEventCollector oam; 3485 oop element_mirror = JNIHandles::resolve(eltClass); 3486 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3487 return JNIHandles::make_local(env, result); 3488 JVM_END 3489 3490 3491 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3492 JVMWrapper("JVM_NewMultiArray"); 3493 JvmtiVMObjectAllocEventCollector oam; 3494 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3495 oop element_mirror = JNIHandles::resolve(eltClass); 3496 assert(dim_array->is_typeArray(), "just checking"); 3497 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3498 return JNIHandles::make_local(env, result); 3499 JVM_END 3500 3501 3502 // Library support /////////////////////////////////////////////////////////////////////////// 3503 3504 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3505 //%note jvm_ct 3506 JVMWrapper("JVM_LoadLibrary"); 3507 char ebuf[1024]; 3508 void *load_result; 3509 { 3510 ThreadToNativeFromVM ttnfvm(thread); 3511 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3512 } 3513 if (load_result == NULL) { 3514 char msg[1024]; 3515 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3516 // Since 'ebuf' may contain a string encoded using 3517 // platform encoding scheme, we need to pass 3518 // Exceptions::unsafe_to_utf8 to the new_exception method 3519 // as the last argument. See bug 6367357. 3520 Handle h_exception = 3521 Exceptions::new_exception(thread, 3522 vmSymbols::java_lang_UnsatisfiedLinkError(), 3523 msg, Exceptions::unsafe_to_utf8); 3524 3525 THROW_HANDLE_0(h_exception); 3526 } 3527 return load_result; 3528 JVM_END 3529 3530 3531 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3532 JVMWrapper("JVM_UnloadLibrary"); 3533 os::dll_unload(handle); 3534 JVM_END 3535 3536 3537 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3538 JVMWrapper("JVM_FindLibraryEntry"); 3539 return os::dll_lookup(handle, name); 3540 JVM_END 3541 3542 3543 // JNI version /////////////////////////////////////////////////////////////////////////////// 3544 3545 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3546 JVMWrapper("JVM_IsSupportedJNIVersion"); 3547 return Threads::is_supported_jni_version_including_1_1(version); 3548 JVM_END 3549 3550 3551 // String support /////////////////////////////////////////////////////////////////////////// 3552 3553 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3554 JVMWrapper("JVM_InternString"); 3555 JvmtiVMObjectAllocEventCollector oam; 3556 if (str == NULL) return NULL; 3557 oop string = JNIHandles::resolve_non_null(str); 3558 oop result = StringTable::intern(string, CHECK_NULL); 3559 return (jstring) JNIHandles::make_local(env, result); 3560 JVM_END 3561 3562 3563 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3564 3565 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3566 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3567 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3568 // that only works with java threads. 3569 3570 3571 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3572 VM_Exit::block_if_vm_exited(); 3573 JVMWrapper("JVM_RawMonitorCreate"); 3574 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3575 } 3576 3577 3578 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3579 VM_Exit::block_if_vm_exited(); 3580 JVMWrapper("JVM_RawMonitorDestroy"); 3581 delete ((Mutex*) mon); 3582 } 3583 3584 3585 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3586 VM_Exit::block_if_vm_exited(); 3587 JVMWrapper("JVM_RawMonitorEnter"); 3588 ((Mutex*) mon)->jvm_raw_lock(); 3589 return 0; 3590 } 3591 3592 3593 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3594 VM_Exit::block_if_vm_exited(); 3595 JVMWrapper("JVM_RawMonitorExit"); 3596 ((Mutex*) mon)->jvm_raw_unlock(); 3597 } 3598 3599 3600 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3601 3602 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3603 Handle loader, Handle protection_domain, 3604 jboolean throwError, TRAPS) { 3605 // Security Note: 3606 // The Java level wrapper will perform the necessary security check allowing 3607 // us to pass the NULL as the initiating class loader. The VM is responsible for 3608 // the checkPackageAccess relative to the initiating class loader via the 3609 // protection_domain. The protection_domain is passed as NULL by the java code 3610 // if there is no security manager in 3-arg Class.forName(). 3611 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3612 3613 KlassHandle klass_handle(THREAD, klass); 3614 // Check if we should initialize the class 3615 if (init && klass_handle->is_instance_klass()) { 3616 klass_handle->initialize(CHECK_NULL); 3617 } 3618 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror()); 3619 } 3620 3621 3622 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3623 3624 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3625 JVMWrapper("JVM_InvokeMethod"); 3626 Handle method_handle; 3627 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3628 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3629 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3630 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3631 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3632 jobject res = JNIHandles::make_local(env, result); 3633 if (JvmtiExport::should_post_vm_object_alloc()) { 3634 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3635 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3636 if (java_lang_Class::is_primitive(ret_type)) { 3637 // Only for primitive type vm allocates memory for java object. 3638 // See box() method. 3639 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3640 } 3641 } 3642 return res; 3643 } else { 3644 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3645 } 3646 JVM_END 3647 3648 3649 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3650 JVMWrapper("JVM_NewInstanceFromConstructor"); 3651 oop constructor_mirror = JNIHandles::resolve(c); 3652 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3653 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3654 jobject res = JNIHandles::make_local(env, result); 3655 if (JvmtiExport::should_post_vm_object_alloc()) { 3656 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3657 } 3658 return res; 3659 JVM_END 3660 3661 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3662 3663 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3664 JVMWrapper("JVM_SupportsCX8"); 3665 return VM_Version::supports_cx8(); 3666 JVM_END 3667 3668 // Returns an array of all live Thread objects (VM internal JavaThreads, 3669 // jvmti agent threads, and JNI attaching threads are skipped) 3670 // See CR 6404306 regarding JNI attaching threads 3671 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3672 ResourceMark rm(THREAD); 3673 ThreadsListEnumerator tle(THREAD, false, false); 3674 JvmtiVMObjectAllocEventCollector oam; 3675 3676 int num_threads = tle.num_threads(); 3677 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3678 objArrayHandle threads_ah(THREAD, r); 3679 3680 for (int i = 0; i < num_threads; i++) { 3681 Handle h = tle.get_threadObj(i); 3682 threads_ah->obj_at_put(i, h()); 3683 } 3684 3685 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3686 JVM_END 3687 3688 3689 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3690 // Return StackTraceElement[][], each element is the stack trace of a thread in 3691 // the corresponding entry in the given threads array 3692 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3693 JVMWrapper("JVM_DumpThreads"); 3694 JvmtiVMObjectAllocEventCollector oam; 3695 3696 // Check if threads is null 3697 if (threads == NULL) { 3698 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3699 } 3700 3701 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3702 objArrayHandle ah(THREAD, a); 3703 int num_threads = ah->length(); 3704 // check if threads is non-empty array 3705 if (num_threads == 0) { 3706 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3707 } 3708 3709 // check if threads is not an array of objects of Thread class 3710 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3711 if (k != SystemDictionary::Thread_klass()) { 3712 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3713 } 3714 3715 ResourceMark rm(THREAD); 3716 3717 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3718 for (int i = 0; i < num_threads; i++) { 3719 oop thread_obj = ah->obj_at(i); 3720 instanceHandle h(THREAD, (instanceOop) thread_obj); 3721 thread_handle_array->append(h); 3722 } 3723 3724 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3725 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3726 3727 JVM_END 3728 3729 // JVM monitoring and management support 3730 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3731 return Management::get_jmm_interface(version); 3732 JVM_END 3733 3734 // com.sun.tools.attach.VirtualMachine agent properties support 3735 // 3736 // Initialize the agent properties with the properties maintained in the VM 3737 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3738 JVMWrapper("JVM_InitAgentProperties"); 3739 ResourceMark rm; 3740 3741 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3742 3743 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3744 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3745 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3746 return properties; 3747 JVM_END 3748 3749 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3750 { 3751 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3752 JvmtiVMObjectAllocEventCollector oam; 3753 3754 if (ofClass == NULL) { 3755 return NULL; 3756 } 3757 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3758 // Special handling for primitive objects 3759 if (java_lang_Class::is_primitive(mirror())) { 3760 return NULL; 3761 } 3762 Klass* k = java_lang_Class::as_Klass(mirror()); 3763 if (!k->is_instance_klass()) { 3764 return NULL; 3765 } 3766 instanceKlassHandle ik_h(THREAD, k); 3767 int encl_method_class_idx = ik_h->enclosing_method_class_index(); 3768 if (encl_method_class_idx == 0) { 3769 return NULL; 3770 } 3771 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3772 objArrayHandle dest(THREAD, dest_o); 3773 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3774 dest->obj_at_put(0, enc_k->java_mirror()); 3775 int encl_method_method_idx = ik_h->enclosing_method_method_index(); 3776 if (encl_method_method_idx != 0) { 3777 Symbol* sym = ik_h->constants()->symbol_at( 3778 extract_low_short_from_int( 3779 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3780 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3781 dest->obj_at_put(1, str()); 3782 sym = ik_h->constants()->symbol_at( 3783 extract_high_short_from_int( 3784 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3785 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3786 dest->obj_at_put(2, str()); 3787 } 3788 return (jobjectArray) JNIHandles::make_local(dest()); 3789 } 3790 JVM_END 3791 3792 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3793 { 3794 memset(info, 0, info_size); 3795 3796 info->jvm_version = Abstract_VM_Version::jvm_version(); 3797 info->patch_version = Abstract_VM_Version::vm_patch_version(); 3798 3799 // when we add a new capability in the jvm_version_info struct, we should also 3800 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3801 // counter defined in runtimeService.cpp. 3802 info->is_attachable = AttachListener::is_attach_supported(); 3803 } 3804 JVM_END 3805 3806 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3807 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3808 ResourceMark rm(THREAD); 3809 3810 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3811 return NULL; 3812 } 3813 3814 char** vm_flags = Arguments::jvm_flags_array(); 3815 char** vm_args = Arguments::jvm_args_array(); 3816 int num_flags = Arguments::num_jvm_flags(); 3817 int num_args = Arguments::num_jvm_args(); 3818 3819 instanceKlassHandle ik (THREAD, SystemDictionary::String_klass()); 3820 objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL); 3821 objArrayHandle result_h(THREAD, r); 3822 3823 int index = 0; 3824 for (int j = 0; j < num_flags; j++, index++) { 3825 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3826 result_h->obj_at_put(index, h()); 3827 } 3828 for (int i = 0; i < num_args; i++, index++) { 3829 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3830 result_h->obj_at_put(index, h()); 3831 } 3832 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3833 JVM_END 3834 3835 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3836 return os::get_signal_number(name); 3837 JVM_END