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