1 /* 2 * Copyright (c) 1997, 2018, 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 "jvm.h" 27 #include "classfile/classFileStream.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/javaAssertions.hpp" 31 #include "classfile/javaClasses.inline.hpp" 32 #include "classfile/moduleEntry.hpp" 33 #include "classfile/modules.hpp" 34 #include "classfile/packageEntry.hpp" 35 #include "classfile/stringTable.hpp" 36 #include "classfile/systemDictionary.hpp" 37 #include "classfile/vmSymbols.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.hpp" 43 #include "oops/access.inline.hpp" 44 #include "oops/fieldStreams.hpp" 45 #include "oops/instanceKlass.hpp" 46 #include "oops/method.hpp" 47 #include "oops/objArrayKlass.hpp" 48 #include "oops/objArrayOop.inline.hpp" 49 #include "oops/oop.inline.hpp" 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.inline.hpp" 61 #include "runtime/java.hpp" 62 #include "runtime/javaCalls.hpp" 63 #include "runtime/jfieldIDWorkaround.hpp" 64 #include "runtime/jniHandles.inline.hpp" 65 #include "runtime/orderAccess.inline.hpp" 66 #include "runtime/os.inline.hpp" 67 #include "runtime/perfData.hpp" 68 #include "runtime/reflection.hpp" 69 #include "runtime/thread.inline.hpp" 70 #include "runtime/threadSMR.hpp" 71 #include "runtime/vframe.hpp" 72 #include "runtime/vm_operations.hpp" 73 #include "runtime/vm_version.hpp" 74 #include "services/attachListener.hpp" 75 #include "services/management.hpp" 76 #include "services/threadService.hpp" 77 #include "trace/tracing.hpp" 78 #include "utilities/copy.hpp" 79 #include "utilities/defaultStream.hpp" 80 #include "utilities/dtrace.hpp" 81 #include "utilities/events.hpp" 82 #include "utilities/histogram.hpp" 83 #include "utilities/macros.hpp" 84 #include "utilities/utf8.hpp" 85 #if INCLUDE_CDS 86 #include "classfile/sharedClassUtil.hpp" 87 #include "classfile/systemDictionaryShared.hpp" 88 #endif 89 90 #include <errno.h> 91 92 /* 93 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 94 such ctors and calls MUST NOT come between an oop declaration/init and its 95 usage because if objects are move this may cause various memory stomps, bus 96 errors and segfaults. Here is a cookbook for causing so called "naked oop 97 failures": 98 99 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 100 JVMWrapper("JVM_GetClassDeclaredFields"); 101 102 // Object address to be held directly in mirror & not visible to GC 103 oop mirror = JNIHandles::resolve_non_null(ofClass); 104 105 // If this ctor can hit a safepoint, moving objects around, then 106 ComplexConstructor foo; 107 108 // Boom! mirror may point to JUNK instead of the intended object 109 (some dereference of mirror) 110 111 // Here's another call that may block for GC, making mirror stale 112 MutexLocker ml(some_lock); 113 114 // And here's an initializer that can result in a stale oop 115 // all in one step. 116 oop o = call_that_can_throw_exception(TRAPS); 117 118 119 The solution is to keep the oop declaration BELOW the ctor or function 120 call that might cause a GC, do another resolve to reassign the oop, or 121 consider use of a Handle instead of an oop so there is immunity from object 122 motion. But note that the "QUICK" entries below do not have a handlemark 123 and thus can only support use of handles passed in. 124 */ 125 126 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 127 ResourceMark rm; 128 int line_number = -1; 129 const char * source_file = NULL; 130 const char * trace = "explicit"; 131 InstanceKlass* caller = NULL; 132 JavaThread* jthread = JavaThread::current(); 133 if (jthread->has_last_Java_frame()) { 134 vframeStream vfst(jthread); 135 136 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 137 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 138 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 139 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 140 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 141 142 Method* last_caller = NULL; 143 144 while (!vfst.at_end()) { 145 Method* m = vfst.method(); 146 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 147 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 148 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 149 break; 150 } 151 last_caller = m; 152 vfst.next(); 153 } 154 // if this is called from Class.forName0 and that is called from Class.forName, 155 // then print the caller of Class.forName. If this is Class.loadClass, then print 156 // that caller, otherwise keep quiet since this should be picked up elsewhere. 157 bool found_it = false; 158 if (!vfst.at_end() && 159 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 160 vfst.method()->name() == vmSymbols::forName0_name()) { 161 vfst.next(); 162 if (!vfst.at_end() && 163 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 164 vfst.method()->name() == vmSymbols::forName_name()) { 165 vfst.next(); 166 found_it = true; 167 } 168 } else if (last_caller != NULL && 169 last_caller->method_holder()->name() == 170 vmSymbols::java_lang_ClassLoader() && 171 last_caller->name() == vmSymbols::loadClass_name()) { 172 found_it = true; 173 } else if (!vfst.at_end()) { 174 if (vfst.method()->is_native()) { 175 // JNI call 176 found_it = true; 177 } 178 } 179 if (found_it && !vfst.at_end()) { 180 // found the caller 181 caller = vfst.method()->method_holder(); 182 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 183 if (line_number == -1) { 184 // show method name if it's a native method 185 trace = vfst.method()->name_and_sig_as_C_string(); 186 } 187 Symbol* s = caller->source_file_name(); 188 if (s != NULL) { 189 source_file = s->as_C_string(); 190 } 191 } 192 } 193 if (caller != NULL) { 194 if (to_class != caller) { 195 const char * from = caller->external_name(); 196 const char * to = to_class->external_name(); 197 // print in a single call to reduce interleaving between threads 198 if (source_file != NULL) { 199 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 200 } else { 201 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 202 } 203 } 204 } 205 } 206 207 void trace_class_resolution(Klass* to_class) { 208 EXCEPTION_MARK; 209 trace_class_resolution_impl(to_class, THREAD); 210 if (HAS_PENDING_EXCEPTION) { 211 CLEAR_PENDING_EXCEPTION; 212 } 213 } 214 215 // Wrapper to trace JVM functions 216 217 #ifdef ASSERT 218 Histogram* JVMHistogram; 219 volatile int JVMHistogram_lock = 0; 220 221 class JVMHistogramElement : public HistogramElement { 222 public: 223 JVMHistogramElement(const char* name); 224 }; 225 226 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 227 _name = elementName; 228 uintx count = 0; 229 230 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 231 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 232 count +=1; 233 if ( (WarnOnStalledSpinLock > 0) 234 && (count % WarnOnStalledSpinLock == 0)) { 235 warning("JVMHistogram_lock seems to be stalled"); 236 } 237 } 238 } 239 240 if(JVMHistogram == NULL) 241 JVMHistogram = new Histogram("JVM Call Counts",100); 242 243 JVMHistogram->add_element(this); 244 Atomic::dec(&JVMHistogram_lock); 245 } 246 247 #define JVMCountWrapper(arg) \ 248 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 249 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 250 251 #define JVMWrapper(arg) JVMCountWrapper(arg); 252 #else 253 #define JVMWrapper(arg) 254 #endif 255 256 257 // Interface version ///////////////////////////////////////////////////////////////////// 258 259 260 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 261 return JVM_INTERFACE_VERSION; 262 JVM_END 263 264 265 // java.lang.System ////////////////////////////////////////////////////////////////////// 266 267 268 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 269 JVMWrapper("JVM_CurrentTimeMillis"); 270 return os::javaTimeMillis(); 271 JVM_END 272 273 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 274 JVMWrapper("JVM_NanoTime"); 275 return os::javaTimeNanos(); 276 JVM_END 277 278 // The function below is actually exposed by jdk.internal.misc.VM and not 279 // java.lang.System, but we choose to keep it here so that it stays next 280 // to JVM_CurrentTimeMillis and JVM_NanoTime 281 282 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 283 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 284 285 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 286 JVMWrapper("JVM_GetNanoTimeAdjustment"); 287 jlong seconds; 288 jlong nanos; 289 290 os::javaTimeSystemUTC(seconds, nanos); 291 292 // We're going to verify that the result can fit in a long. 293 // For that we need the difference in seconds between 'seconds' 294 // and 'offset_secs' to be such that: 295 // |seconds - offset_secs| < (2^63/10^9) 296 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 297 // which makes |seconds - offset_secs| < 2^33 298 // and we will prefer +/- 2^32 as the maximum acceptable diff 299 // as 2^32 has a more natural feel than 2^33... 300 // 301 // So if |seconds - offset_secs| >= 2^32 - we return a special 302 // sentinel value (-1) which the caller should take as an 303 // exception value indicating that the offset given to us is 304 // too far from range of the current time - leading to too big 305 // a nano adjustment. The caller is expected to recover by 306 // computing a more accurate offset and calling this method 307 // again. (For the record 2^32 secs is ~136 years, so that 308 // should rarely happen) 309 // 310 jlong diff = seconds - offset_secs; 311 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 312 return -1; // sentinel value: the offset is too far off the target 313 } 314 315 // return the adjustment. If you compute a time by adding 316 // this number of nanoseconds along with the number of seconds 317 // in the offset you should get the current UTC time. 318 return (diff * (jlong)1000000000) + nanos; 319 JVM_END 320 321 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 322 jobject dst, jint dst_pos, jint length)) 323 JVMWrapper("JVM_ArrayCopy"); 324 // Check if we have null pointers 325 if (src == NULL || dst == NULL) { 326 THROW(vmSymbols::java_lang_NullPointerException()); 327 } 328 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 329 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 330 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 331 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 332 // Do copy 333 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 334 JVM_END 335 336 337 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 338 JavaValue r(T_OBJECT); 339 // public synchronized Object put(Object key, Object value); 340 HandleMark hm(THREAD); 341 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 342 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 343 JavaCalls::call_virtual(&r, 344 props, 345 SystemDictionary::Properties_klass(), 346 vmSymbols::put_name(), 347 vmSymbols::object_object_object_signature(), 348 key_str, 349 value_str, 350 THREAD); 351 } 352 353 354 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 355 356 357 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 358 JVMWrapper("JVM_InitProperties"); 359 ResourceMark rm; 360 361 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 362 363 // System property list includes both user set via -D option and 364 // jvm system specific properties. 365 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 366 PUTPROP(props, p->key(), p->value()); 367 } 368 369 // Convert the -XX:MaxDirectMemorySize= command line flag 370 // to the sun.nio.MaxDirectMemorySize property. 371 // Do this after setting user properties to prevent people 372 // from setting the value with a -D option, as requested. 373 { 374 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 375 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 376 } else { 377 char as_chars[256]; 378 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 379 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 380 } 381 } 382 383 // JVM monitoring and management support 384 // Add the sun.management.compiler property for the compiler's name 385 { 386 #undef CSIZE 387 #if defined(_LP64) || defined(_WIN64) 388 #define CSIZE "64-Bit " 389 #else 390 #define CSIZE 391 #endif // 64bit 392 393 #ifdef TIERED 394 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 395 #else 396 #if defined(COMPILER1) 397 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 398 #elif defined(COMPILER2) 399 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 400 #elif INCLUDE_JVMCI 401 #error "INCLUDE_JVMCI should imply TIERED" 402 #else 403 const char* compiler_name = ""; 404 #endif // compilers 405 #endif // TIERED 406 407 if (*compiler_name != '\0' && 408 (Arguments::mode() != Arguments::_int)) { 409 PUTPROP(props, "sun.management.compiler", compiler_name); 410 } 411 } 412 413 return properties; 414 JVM_END 415 416 417 /* 418 * Return the temporary directory that the VM uses for the attach 419 * and perf data files. 420 * 421 * It is important that this directory is well-known and the 422 * same for all VM instances. It cannot be affected by configuration 423 * variables such as java.io.tmpdir. 424 */ 425 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 426 JVMWrapper("JVM_GetTemporaryDirectory"); 427 HandleMark hm(THREAD); 428 const char* temp_dir = os::get_temp_directory(); 429 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 430 return (jstring) JNIHandles::make_local(env, h()); 431 JVM_END 432 433 434 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 435 436 extern volatile jint vm_created; 437 438 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 439 JVMWrapper("JVM_BeforeHalt"); 440 EventShutdown event; 441 if (event.should_commit()) { 442 event.set_reason("Shutdown requested from Java"); 443 event.commit(); 444 } 445 JVM_END 446 447 448 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 449 before_exit(thread); 450 vm_exit(code); 451 JVM_END 452 453 454 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 455 JVMWrapper("JVM_GC"); 456 if (!DisableExplicitGC) { 457 Universe::heap()->collect(GCCause::_java_lang_system_gc); 458 } 459 JVM_END 460 461 462 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 463 JVMWrapper("JVM_MaxObjectInspectionAge"); 464 return Universe::heap()->millis_since_last_gc(); 465 JVM_END 466 467 468 static inline jlong convert_size_t_to_jlong(size_t val) { 469 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 470 NOT_LP64 (return (jlong)val;) 471 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 472 } 473 474 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 475 JVMWrapper("JVM_TotalMemory"); 476 size_t n = Universe::heap()->capacity(); 477 return convert_size_t_to_jlong(n); 478 JVM_END 479 480 481 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 482 JVMWrapper("JVM_FreeMemory"); 483 CollectedHeap* ch = Universe::heap(); 484 size_t n; 485 { 486 MutexLocker x(Heap_lock); 487 n = ch->capacity() - ch->used(); 488 } 489 return convert_size_t_to_jlong(n); 490 JVM_END 491 492 493 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 494 JVMWrapper("JVM_MaxMemory"); 495 size_t n = Universe::heap()->max_capacity(); 496 return convert_size_t_to_jlong(n); 497 JVM_END 498 499 500 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 501 JVMWrapper("JVM_ActiveProcessorCount"); 502 return os::active_processor_count(); 503 JVM_END 504 505 506 507 // java.lang.Throwable ////////////////////////////////////////////////////// 508 509 510 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 511 JVMWrapper("JVM_FillInStackTrace"); 512 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 513 java_lang_Throwable::fill_in_stack_trace(exception); 514 JVM_END 515 516 517 // java.lang.StackTraceElement ////////////////////////////////////////////// 518 519 520 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 521 JVMWrapper("JVM_InitStackTraceElementArray"); 522 Handle exception(THREAD, JNIHandles::resolve(throwable)); 523 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 524 objArrayHandle stack_trace(THREAD, st); 525 // Fill in the allocated stack trace 526 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 527 JVM_END 528 529 530 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 531 JVMWrapper("JVM_InitStackTraceElement"); 532 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 533 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 534 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 535 JVM_END 536 537 538 // java.lang.StackWalker ////////////////////////////////////////////////////// 539 540 541 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 542 jint skip_frames, jint frame_count, jint start_index, 543 jobjectArray frames)) 544 JVMWrapper("JVM_CallStackWalk"); 545 JavaThread* jt = (JavaThread*) THREAD; 546 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 547 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 548 } 549 550 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 551 552 // frames array is a Class<?>[] array when only getting caller reference, 553 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 554 // be null. 555 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 556 objArrayHandle frames_array_h(THREAD, fa); 557 558 int limit = start_index + frame_count; 559 if (frames_array_h->length() < limit) { 560 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 561 } 562 563 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 564 start_index, frames_array_h, CHECK_NULL); 565 return JNIHandles::make_local(env, result); 566 JVM_END 567 568 569 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 570 jint frame_count, jint start_index, 571 jobjectArray frames)) 572 JVMWrapper("JVM_MoreStackWalk"); 573 JavaThread* jt = (JavaThread*) THREAD; 574 575 // frames array is a Class<?>[] array when only getting caller reference, 576 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 577 // be null. 578 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 579 objArrayHandle frames_array_h(THREAD, fa); 580 581 int limit = start_index+frame_count; 582 if (frames_array_h->length() < limit) { 583 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 584 } 585 586 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 587 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 588 start_index, frames_array_h, THREAD); 589 JVM_END 590 591 // java.lang.Object /////////////////////////////////////////////// 592 593 594 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 595 JVMWrapper("JVM_IHashCode"); 596 // as implemented in the classic virtual machine; return 0 if object is NULL 597 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 598 JVM_END 599 600 601 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 602 JVMWrapper("JVM_MonitorWait"); 603 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 604 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 605 if (JvmtiExport::should_post_monitor_wait()) { 606 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 607 608 // The current thread already owns the monitor and it has not yet 609 // been added to the wait queue so the current thread cannot be 610 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 611 // event handler cannot accidentally consume an unpark() meant for 612 // the ParkEvent associated with this ObjectMonitor. 613 } 614 ObjectSynchronizer::wait(obj, ms, CHECK); 615 JVM_END 616 617 618 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 619 JVMWrapper("JVM_MonitorNotify"); 620 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 621 ObjectSynchronizer::notify(obj, CHECK); 622 JVM_END 623 624 625 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 626 JVMWrapper("JVM_MonitorNotifyAll"); 627 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 628 ObjectSynchronizer::notifyall(obj, CHECK); 629 JVM_END 630 631 632 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 633 JVMWrapper("JVM_Clone"); 634 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 635 Klass* klass = obj->klass(); 636 JvmtiVMObjectAllocEventCollector oam; 637 638 #ifdef ASSERT 639 // Just checking that the cloneable flag is set correct 640 if (obj->is_array()) { 641 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 642 } else { 643 guarantee(obj->is_instance(), "should be instanceOop"); 644 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 645 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 646 } 647 #endif 648 649 // Check if class of obj supports the Cloneable interface. 650 // All arrays are considered to be cloneable (See JLS 20.1.5) 651 if (!klass->is_cloneable()) { 652 ResourceMark rm(THREAD); 653 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 654 } 655 656 // Make shallow object copy 657 const int size = obj->size(); 658 oop new_obj_oop = NULL; 659 if (obj->is_array()) { 660 const int length = ((arrayOop)obj())->length(); 661 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 662 } else { 663 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 664 } 665 666 HeapAccess<>::clone(obj(), new_obj_oop, size); 667 668 Handle new_obj(THREAD, new_obj_oop); 669 // Caution: this involves a java upcall, so the clone should be 670 // "gc-robust" by this stage. 671 if (klass->has_finalizer()) { 672 assert(obj->is_instance(), "should be instanceOop"); 673 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 674 new_obj = Handle(THREAD, new_obj_oop); 675 } 676 677 return JNIHandles::make_local(env, new_obj()); 678 JVM_END 679 680 // java.io.File /////////////////////////////////////////////////////////////// 681 682 JVM_LEAF(char*, JVM_NativePath(char* path)) 683 JVMWrapper("JVM_NativePath"); 684 return os::native_path(path); 685 JVM_END 686 687 688 // Misc. class handling /////////////////////////////////////////////////////////// 689 690 691 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 692 JVMWrapper("JVM_GetCallerClass"); 693 694 // Getting the class of the caller frame. 695 // 696 // The call stack at this point looks something like this: 697 // 698 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 699 // [1] [ @CallerSensitive API.method ] 700 // [.] [ (skipped intermediate frames) ] 701 // [n] [ caller ] 702 vframeStream vfst(thread); 703 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 704 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 705 Method* m = vfst.method(); 706 assert(m != NULL, "sanity"); 707 switch (n) { 708 case 0: 709 // This must only be called from Reflection.getCallerClass 710 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 711 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 712 } 713 // fall-through 714 case 1: 715 // Frame 0 and 1 must be caller sensitive. 716 if (!m->caller_sensitive()) { 717 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 718 } 719 break; 720 default: 721 if (!m->is_ignored_by_security_stack_walk()) { 722 // We have reached the desired frame; return the holder class. 723 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 724 } 725 break; 726 } 727 } 728 return NULL; 729 JVM_END 730 731 732 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 733 JVMWrapper("JVM_FindPrimitiveClass"); 734 oop mirror = NULL; 735 BasicType t = name2type(utf); 736 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 737 mirror = Universe::java_mirror(t); 738 } 739 if (mirror == NULL) { 740 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 741 } else { 742 return (jclass) JNIHandles::make_local(env, mirror); 743 } 744 JVM_END 745 746 747 // Returns a class loaded by the bootstrap class loader; or null 748 // if not found. ClassNotFoundException is not thrown. 749 // FindClassFromBootLoader is exported to the launcher for windows. 750 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 751 const char* name)) 752 JVMWrapper("JVM_FindClassFromBootLoader"); 753 754 // Java libraries should ensure that name is never null... 755 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 756 // It's impossible to create this class; the name cannot fit 757 // into the constant pool. 758 return NULL; 759 } 760 761 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 762 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 763 if (k == NULL) { 764 return NULL; 765 } 766 767 if (log_is_enabled(Debug, class, resolve)) { 768 trace_class_resolution(k); 769 } 770 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 771 JVM_END 772 773 // Find a class with this name in this loader, using the caller's protection domain. 774 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 775 jboolean init, jobject loader, 776 jclass caller)) 777 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 778 // Java libraries should ensure that name is never null... 779 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 780 // It's impossible to create this class; the name cannot fit 781 // into the constant pool. 782 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 783 } 784 785 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 786 787 oop loader_oop = JNIHandles::resolve(loader); 788 oop from_class = JNIHandles::resolve(caller); 789 oop protection_domain = NULL; 790 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 791 // NPE. Put it in another way, the bootstrap class loader has all permission and 792 // thus no checkPackageAccess equivalence in the VM class loader. 793 // The caller is also passed as NULL by the java code if there is no security 794 // manager to avoid the performance cost of getting the calling class. 795 if (from_class != NULL && loader_oop != NULL) { 796 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 797 } 798 799 Handle h_loader(THREAD, loader_oop); 800 Handle h_prot(THREAD, protection_domain); 801 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 802 h_prot, false, THREAD); 803 804 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 805 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 806 } 807 return result; 808 JVM_END 809 810 // Currently only called from the old verifier. 811 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 812 jboolean init, jclass from)) 813 JVMWrapper("JVM_FindClassFromClass"); 814 if (name == NULL) { 815 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 816 } 817 if ((int)strlen(name) > Symbol::max_length()) { 818 // It's impossible to create this class; the name cannot fit 819 // into the constant pool. 820 Exceptions::fthrow(THREAD_AND_LOCATION, 821 vmSymbols::java_lang_NoClassDefFoundError(), 822 "Class name exceeds maximum length of %d: %s", 823 Symbol::max_length(), 824 name); 825 return 0; 826 } 827 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 828 oop from_class_oop = JNIHandles::resolve(from); 829 Klass* from_class = (from_class_oop == NULL) 830 ? (Klass*)NULL 831 : java_lang_Class::as_Klass(from_class_oop); 832 oop class_loader = NULL; 833 oop protection_domain = NULL; 834 if (from_class != NULL) { 835 class_loader = from_class->class_loader(); 836 protection_domain = from_class->protection_domain(); 837 } 838 Handle h_loader(THREAD, class_loader); 839 Handle h_prot (THREAD, protection_domain); 840 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 841 h_prot, true, thread); 842 843 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 844 // this function is generally only used for class loading during verification. 845 ResourceMark rm; 846 oop from_mirror = JNIHandles::resolve_non_null(from); 847 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 848 const char * from_name = from_class->external_name(); 849 850 oop mirror = JNIHandles::resolve_non_null(result); 851 Klass* to_class = java_lang_Class::as_Klass(mirror); 852 const char * to = to_class->external_name(); 853 log_debug(class, resolve)("%s %s (verification)", from_name, to); 854 } 855 856 return result; 857 JVM_END 858 859 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 860 if (loader.is_null()) { 861 return; 862 } 863 864 // check whether the current caller thread holds the lock or not. 865 // If not, increment the corresponding counter 866 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 867 ObjectSynchronizer::owner_self) { 868 counter->inc(); 869 } 870 } 871 872 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 873 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 874 jobject loader, const jbyte *buf, 875 jsize len, jobject pd, const char *source, 876 TRAPS) { 877 if (source == NULL) source = "__JVM_DefineClass__"; 878 879 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 880 JavaThread* jt = (JavaThread*) THREAD; 881 882 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 883 ClassLoader::perf_define_appclass_selftime(), 884 ClassLoader::perf_define_appclasses(), 885 jt->get_thread_stat()->perf_recursion_counts_addr(), 886 jt->get_thread_stat()->perf_timers_addr(), 887 PerfClassTraceTime::DEFINE_CLASS); 888 889 if (UsePerfData) { 890 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 891 } 892 893 // Since exceptions can be thrown, class initialization can take place 894 // if name is NULL no check for class name in .class stream has to be made. 895 TempNewSymbol class_name = NULL; 896 if (name != NULL) { 897 const int str_len = (int)strlen(name); 898 if (str_len > Symbol::max_length()) { 899 // It's impossible to create this class; the name cannot fit 900 // into the constant pool. 901 Exceptions::fthrow(THREAD_AND_LOCATION, 902 vmSymbols::java_lang_NoClassDefFoundError(), 903 "Class name exceeds maximum length of %d: %s", 904 Symbol::max_length(), 905 name); 906 return 0; 907 } 908 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 909 } 910 911 ResourceMark rm(THREAD); 912 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 913 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 914 if (UsePerfData) { 915 is_lock_held_by_thread(class_loader, 916 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 917 THREAD); 918 } 919 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 920 Klass* k = SystemDictionary::resolve_from_stream(class_name, 921 class_loader, 922 protection_domain, 923 &st, 924 CHECK_NULL); 925 926 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 927 trace_class_resolution(k); 928 } 929 930 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 931 } 932 933 934 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 935 JVMWrapper("JVM_DefineClass"); 936 937 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 938 JVM_END 939 940 941 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 942 JVMWrapper("JVM_DefineClassWithSource"); 943 944 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 945 JVM_END 946 947 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 948 JVMWrapper("JVM_FindLoadedClass"); 949 ResourceMark rm(THREAD); 950 951 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 952 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 953 954 const char* str = java_lang_String::as_utf8_string(string()); 955 // Sanity check, don't expect null 956 if (str == NULL) return NULL; 957 958 const int str_len = (int)strlen(str); 959 if (str_len > Symbol::max_length()) { 960 // It's impossible to create this class; the name cannot fit 961 // into the constant pool. 962 return NULL; 963 } 964 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 965 966 // Security Note: 967 // The Java level wrapper will perform the necessary security check allowing 968 // us to pass the NULL as the initiating class loader. 969 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 970 if (UsePerfData) { 971 is_lock_held_by_thread(h_loader, 972 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 973 THREAD); 974 } 975 976 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 977 h_loader, 978 Handle(), 979 CHECK_NULL); 980 #if INCLUDE_CDS 981 if (k == NULL) { 982 // If the class is not already loaded, try to see if it's in the shared 983 // archive for the current classloader (h_loader). 984 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 985 } 986 #endif 987 return (k == NULL) ? NULL : 988 (jclass) JNIHandles::make_local(env, k->java_mirror()); 989 JVM_END 990 991 // Module support ////////////////////////////////////////////////////////////////////////////// 992 993 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 994 jstring location, const char* const* packages, jsize num_packages)) 995 JVMWrapper("JVM_DefineModule"); 996 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 997 JVM_END 998 999 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1000 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1001 Modules::set_bootloader_unnamed_module(module, CHECK); 1002 JVM_END 1003 1004 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1005 JVMWrapper("JVM_AddModuleExports"); 1006 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1007 JVM_END 1008 1009 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1010 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1011 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1012 JVM_END 1013 1014 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1015 JVMWrapper("JVM_AddModuleExportsToAll"); 1016 Modules::add_module_exports(from_module, package, NULL, CHECK); 1017 JVM_END 1018 1019 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1020 JVMWrapper("JVM_AddReadsModule"); 1021 Modules::add_reads_module(from_module, source_module, CHECK); 1022 JVM_END 1023 1024 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1025 1026 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1027 assert (cls != NULL, "illegal class"); 1028 JVMWrapper("JVM_GetClassName"); 1029 JvmtiVMObjectAllocEventCollector oam; 1030 ResourceMark rm(THREAD); 1031 const char* name; 1032 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1033 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1034 } else { 1035 // Consider caching interned string in Klass 1036 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1037 assert(k->is_klass(), "just checking"); 1038 name = k->external_name(); 1039 } 1040 oop result = StringTable::intern((char*) name, CHECK_NULL); 1041 return (jstring) JNIHandles::make_local(env, result); 1042 JVM_END 1043 1044 1045 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1046 JVMWrapper("JVM_GetClassInterfaces"); 1047 JvmtiVMObjectAllocEventCollector oam; 1048 oop mirror = JNIHandles::resolve_non_null(cls); 1049 1050 // Special handling for primitive objects 1051 if (java_lang_Class::is_primitive(mirror)) { 1052 // Primitive objects does not have any interfaces 1053 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1054 return (jobjectArray) JNIHandles::make_local(env, r); 1055 } 1056 1057 Klass* klass = java_lang_Class::as_Klass(mirror); 1058 // Figure size of result array 1059 int size; 1060 if (klass->is_instance_klass()) { 1061 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1062 } else { 1063 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1064 size = 2; 1065 } 1066 1067 // Allocate result array 1068 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1069 objArrayHandle result (THREAD, r); 1070 // Fill in result 1071 if (klass->is_instance_klass()) { 1072 // Regular instance klass, fill in all local interfaces 1073 for (int index = 0; index < size; index++) { 1074 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1075 result->obj_at_put(index, k->java_mirror()); 1076 } 1077 } else { 1078 // All arrays implement java.lang.Cloneable and java.io.Serializable 1079 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1080 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1081 } 1082 return (jobjectArray) JNIHandles::make_local(env, result()); 1083 JVM_END 1084 1085 1086 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1087 JVMWrapper("JVM_IsInterface"); 1088 oop mirror = JNIHandles::resolve_non_null(cls); 1089 if (java_lang_Class::is_primitive(mirror)) { 1090 return JNI_FALSE; 1091 } 1092 Klass* k = java_lang_Class::as_Klass(mirror); 1093 jboolean result = k->is_interface(); 1094 assert(!result || k->is_instance_klass(), 1095 "all interfaces are instance types"); 1096 // The compiler intrinsic for isInterface tests the 1097 // Klass::_access_flags bits in the same way. 1098 return result; 1099 JVM_END 1100 1101 1102 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1103 JVMWrapper("JVM_GetClassSigners"); 1104 JvmtiVMObjectAllocEventCollector oam; 1105 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1106 // There are no signers for primitive types 1107 return NULL; 1108 } 1109 1110 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1111 1112 // If there are no signers set in the class, or if the class 1113 // is an array, return NULL. 1114 if (signers == NULL) return NULL; 1115 1116 // copy of the signers array 1117 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1118 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1119 for (int index = 0; index < signers->length(); index++) { 1120 signers_copy->obj_at_put(index, signers->obj_at(index)); 1121 } 1122 1123 // return the copy 1124 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1125 JVM_END 1126 1127 1128 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1129 JVMWrapper("JVM_SetClassSigners"); 1130 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1131 // This call is ignored for primitive types and arrays. 1132 // Signers are only set once, ClassLoader.java, and thus shouldn't 1133 // be called with an array. Only the bootstrap loader creates arrays. 1134 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1135 if (k->is_instance_klass()) { 1136 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1137 } 1138 } 1139 JVM_END 1140 1141 1142 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1143 JVMWrapper("JVM_GetProtectionDomain"); 1144 if (JNIHandles::resolve(cls) == NULL) { 1145 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1146 } 1147 1148 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1149 // Primitive types does not have a protection domain. 1150 return NULL; 1151 } 1152 1153 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1154 return (jobject) JNIHandles::make_local(env, pd); 1155 JVM_END 1156 1157 1158 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) { 1159 // If there is a security manager and protection domain, check the access 1160 // in the protection domain, otherwise it is authorized. 1161 if (java_lang_System::has_security_manager()) { 1162 1163 // For bootstrapping, if pd implies method isn't in the JDK, allow 1164 // this context to revert to older behavior. 1165 // In this case the isAuthorized field in AccessControlContext is also not 1166 // present. 1167 if (Universe::protection_domain_implies_method() == NULL) { 1168 return true; 1169 } 1170 1171 // Whitelist certain access control contexts 1172 if (java_security_AccessControlContext::is_authorized(context)) { 1173 return true; 1174 } 1175 1176 oop prot = klass->protection_domain(); 1177 if (prot != NULL) { 1178 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1179 // in the new wrapper. 1180 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1181 Handle h_prot(THREAD, prot); 1182 JavaValue result(T_BOOLEAN); 1183 JavaCallArguments args(h_prot); 1184 JavaCalls::call(&result, m, &args, CHECK_false); 1185 return (result.get_jboolean() != 0); 1186 } 1187 } 1188 return true; 1189 } 1190 1191 // Create an AccessControlContext with a protection domain with null codesource 1192 // and null permissions - which gives no permissions. 1193 oop create_dummy_access_control_context(TRAPS) { 1194 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1195 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1196 // Call constructor ProtectionDomain(null, null); 1197 JavaValue result(T_VOID); 1198 JavaCalls::call_special(&result, obj, pd_klass, 1199 vmSymbols::object_initializer_name(), 1200 vmSymbols::codesource_permissioncollection_signature(), 1201 Handle(), Handle(), CHECK_NULL); 1202 1203 // new ProtectionDomain[] {pd}; 1204 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1205 context->obj_at_put(0, obj()); 1206 1207 // new AccessControlContext(new ProtectionDomain[] {pd}) 1208 objArrayHandle h_context(THREAD, context); 1209 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1210 return acc; 1211 } 1212 1213 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1214 JVMWrapper("JVM_DoPrivileged"); 1215 1216 if (action == NULL) { 1217 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1218 } 1219 1220 // Compute the frame initiating the do privileged operation and setup the privileged stack 1221 vframeStream vfst(thread); 1222 vfst.security_get_caller_frame(1); 1223 1224 if (vfst.at_end()) { 1225 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1226 } 1227 1228 Method* method = vfst.method(); 1229 InstanceKlass* klass = method->method_holder(); 1230 1231 // Check that action object understands "Object run()" 1232 Handle h_context; 1233 if (context != NULL) { 1234 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1235 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1236 if (!authorized) { 1237 // Create an unprivileged access control object and call it's run function 1238 // instead. 1239 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1240 h_context = Handle(THREAD, noprivs); 1241 } 1242 } 1243 1244 // Check that action object understands "Object run()" 1245 Handle object (THREAD, JNIHandles::resolve(action)); 1246 1247 // get run() method 1248 Method* m_oop = object->klass()->uncached_lookup_method( 1249 vmSymbols::run_method_name(), 1250 vmSymbols::void_object_signature(), 1251 Klass::find_overpass); 1252 1253 // See if there is a default method for "Object run()". 1254 if (m_oop == NULL && object->klass()->is_instance_klass()) { 1255 InstanceKlass* iklass = InstanceKlass::cast(object->klass()); 1256 m_oop = iklass->lookup_method_in_ordered_interfaces( 1257 vmSymbols::run_method_name(), 1258 vmSymbols::void_object_signature()); 1259 } 1260 1261 methodHandle m (THREAD, m_oop); 1262 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) { 1263 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1264 } 1265 1266 // Stack allocated list of privileged stack elements 1267 PrivilegedElement pi; 1268 if (!vfst.at_end()) { 1269 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1270 thread->set_privileged_stack_top(&pi); 1271 } 1272 1273 1274 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1275 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1276 Handle pending_exception; 1277 JavaValue result(T_OBJECT); 1278 JavaCallArguments args(object); 1279 JavaCalls::call(&result, m, &args, THREAD); 1280 1281 // done with action, remove ourselves from the list 1282 if (!vfst.at_end()) { 1283 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1284 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1285 } 1286 1287 if (HAS_PENDING_EXCEPTION) { 1288 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1289 CLEAR_PENDING_EXCEPTION; 1290 // JVMTI has already reported the pending exception 1291 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1292 if (THREAD->is_Java_thread()) { 1293 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1294 } 1295 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1296 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1297 // Throw a java.security.PrivilegedActionException(Exception e) exception 1298 JavaCallArguments args(pending_exception); 1299 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1300 vmSymbols::exception_void_signature(), 1301 &args); 1302 } 1303 } 1304 1305 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1306 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1307 JVM_END 1308 1309 1310 // Returns the inherited_access_control_context field of the running thread. 1311 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1312 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1313 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1314 return JNIHandles::make_local(env, result); 1315 JVM_END 1316 1317 class RegisterArrayForGC { 1318 private: 1319 JavaThread *_thread; 1320 public: 1321 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1322 _thread = thread; 1323 _thread->register_array_for_gc(array); 1324 } 1325 1326 ~RegisterArrayForGC() { 1327 _thread->register_array_for_gc(NULL); 1328 } 1329 }; 1330 1331 1332 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1333 JVMWrapper("JVM_GetStackAccessControlContext"); 1334 if (!UsePrivilegedStack) return NULL; 1335 1336 ResourceMark rm(THREAD); 1337 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1338 JvmtiVMObjectAllocEventCollector oam; 1339 1340 // count the protection domains on the execution stack. We collapse 1341 // duplicate consecutive protection domains into a single one, as 1342 // well as stopping when we hit a privileged frame. 1343 1344 // Use vframeStream to iterate through Java frames 1345 vframeStream vfst(thread); 1346 1347 oop previous_protection_domain = NULL; 1348 Handle privileged_context(thread, NULL); 1349 bool is_privileged = false; 1350 oop protection_domain = NULL; 1351 1352 for(; !vfst.at_end(); vfst.next()) { 1353 // get method of frame 1354 Method* method = vfst.method(); 1355 intptr_t* frame_id = vfst.frame_id(); 1356 1357 // check the privileged frames to see if we have a match 1358 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1359 // this frame is privileged 1360 is_privileged = true; 1361 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1362 protection_domain = thread->privileged_stack_top()->protection_domain(); 1363 } else { 1364 protection_domain = method->method_holder()->protection_domain(); 1365 } 1366 1367 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1368 local_array->push(protection_domain); 1369 previous_protection_domain = protection_domain; 1370 } 1371 1372 if (is_privileged) break; 1373 } 1374 1375 1376 // either all the domains on the stack were system domains, or 1377 // we had a privileged system domain 1378 if (local_array->is_empty()) { 1379 if (is_privileged && privileged_context.is_null()) return NULL; 1380 1381 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1382 return JNIHandles::make_local(env, result); 1383 } 1384 1385 // the resource area must be registered in case of a gc 1386 RegisterArrayForGC ragc(thread, local_array); 1387 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1388 local_array->length(), CHECK_NULL); 1389 objArrayHandle h_context(thread, context); 1390 for (int index = 0; index < local_array->length(); index++) { 1391 h_context->obj_at_put(index, local_array->at(index)); 1392 } 1393 1394 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1395 1396 return JNIHandles::make_local(env, result); 1397 JVM_END 1398 1399 1400 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1401 JVMWrapper("JVM_IsArrayClass"); 1402 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1403 return (k != NULL) && k->is_array_klass() ? true : false; 1404 JVM_END 1405 1406 1407 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1408 JVMWrapper("JVM_IsPrimitiveClass"); 1409 oop mirror = JNIHandles::resolve_non_null(cls); 1410 return (jboolean) java_lang_Class::is_primitive(mirror); 1411 JVM_END 1412 1413 1414 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1415 JVMWrapper("JVM_GetClassModifiers"); 1416 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1417 // Primitive type 1418 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1419 } 1420 1421 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1422 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1423 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1424 return k->modifier_flags(); 1425 JVM_END 1426 1427 1428 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1429 1430 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1431 JvmtiVMObjectAllocEventCollector oam; 1432 // ofClass is a reference to a java_lang_Class object. The mirror object 1433 // of an InstanceKlass 1434 1435 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1436 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1437 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1438 return (jobjectArray)JNIHandles::make_local(env, result); 1439 } 1440 1441 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1442 InnerClassesIterator iter(k); 1443 1444 if (iter.length() == 0) { 1445 // Neither an inner nor outer class 1446 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1447 return (jobjectArray)JNIHandles::make_local(env, result); 1448 } 1449 1450 // find inner class info 1451 constantPoolHandle cp(thread, k->constants()); 1452 int length = iter.length(); 1453 1454 // Allocate temp. result array 1455 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1456 objArrayHandle result (THREAD, r); 1457 int members = 0; 1458 1459 for (; !iter.done(); iter.next()) { 1460 int ioff = iter.inner_class_info_index(); 1461 int ooff = iter.outer_class_info_index(); 1462 1463 if (ioff != 0 && ooff != 0) { 1464 // Check to see if the name matches the class we're looking for 1465 // before attempting to find the class. 1466 if (cp->klass_name_at_matches(k, ooff)) { 1467 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1468 if (outer_klass == k) { 1469 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1470 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1471 1472 // Throws an exception if outer klass has not declared k as 1473 // an inner klass 1474 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1475 1476 result->obj_at_put(members, inner_klass->java_mirror()); 1477 members++; 1478 } 1479 } 1480 } 1481 } 1482 1483 if (members != length) { 1484 // Return array of right length 1485 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1486 for(int i = 0; i < members; i++) { 1487 res->obj_at_put(i, result->obj_at(i)); 1488 } 1489 return (jobjectArray)JNIHandles::make_local(env, res); 1490 } 1491 1492 return (jobjectArray)JNIHandles::make_local(env, result()); 1493 JVM_END 1494 1495 1496 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1497 { 1498 // ofClass is a reference to a java_lang_Class object. 1499 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1500 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1501 return NULL; 1502 } 1503 1504 bool inner_is_member = false; 1505 Klass* outer_klass 1506 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1507 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1508 if (outer_klass == NULL) return NULL; // already a top-level class 1509 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1510 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1511 } 1512 JVM_END 1513 1514 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1515 { 1516 oop mirror = JNIHandles::resolve_non_null(cls); 1517 if (java_lang_Class::is_primitive(mirror) || 1518 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1519 return NULL; 1520 } 1521 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1522 int ooff = 0, noff = 0; 1523 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1524 if (noff != 0) { 1525 constantPoolHandle i_cp(thread, k->constants()); 1526 Symbol* name = i_cp->symbol_at(noff); 1527 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1528 return (jstring) JNIHandles::make_local(env, str()); 1529 } 1530 } 1531 return NULL; 1532 } 1533 JVM_END 1534 1535 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1536 assert (cls != NULL, "illegal class"); 1537 JVMWrapper("JVM_GetClassSignature"); 1538 JvmtiVMObjectAllocEventCollector oam; 1539 ResourceMark rm(THREAD); 1540 // Return null for arrays and primatives 1541 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1542 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1543 if (k->is_instance_klass()) { 1544 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1545 if (sym == NULL) return NULL; 1546 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1547 return (jstring) JNIHandles::make_local(env, str()); 1548 } 1549 } 1550 return NULL; 1551 JVM_END 1552 1553 1554 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1555 assert (cls != NULL, "illegal class"); 1556 JVMWrapper("JVM_GetClassAnnotations"); 1557 1558 // Return null for arrays and primitives 1559 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1560 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1561 if (k->is_instance_klass()) { 1562 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1563 return (jbyteArray) JNIHandles::make_local(env, a); 1564 } 1565 } 1566 return NULL; 1567 JVM_END 1568 1569 1570 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1571 // some of this code was adapted from from jni_FromReflectedField 1572 1573 oop reflected = JNIHandles::resolve_non_null(field); 1574 oop mirror = java_lang_reflect_Field::clazz(reflected); 1575 Klass* k = java_lang_Class::as_Klass(mirror); 1576 int slot = java_lang_reflect_Field::slot(reflected); 1577 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1578 1579 InstanceKlass* ik = InstanceKlass::cast(k); 1580 intptr_t offset = ik->field_offset(slot); 1581 1582 if (modifiers & JVM_ACC_STATIC) { 1583 // for static fields we only look in the current class 1584 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1585 assert(false, "cannot find static field"); 1586 return false; 1587 } 1588 } else { 1589 // for instance fields we start with the current class and work 1590 // our way up through the superclass chain 1591 if (!ik->find_field_from_offset(offset, false, &fd)) { 1592 assert(false, "cannot find instance field"); 1593 return false; 1594 } 1595 } 1596 return true; 1597 } 1598 1599 static Method* jvm_get_method_common(jobject method) { 1600 // some of this code was adapted from from jni_FromReflectedMethod 1601 1602 oop reflected = JNIHandles::resolve_non_null(method); 1603 oop mirror = NULL; 1604 int slot = 0; 1605 1606 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1607 mirror = java_lang_reflect_Constructor::clazz(reflected); 1608 slot = java_lang_reflect_Constructor::slot(reflected); 1609 } else { 1610 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1611 "wrong type"); 1612 mirror = java_lang_reflect_Method::clazz(reflected); 1613 slot = java_lang_reflect_Method::slot(reflected); 1614 } 1615 Klass* k = java_lang_Class::as_Klass(mirror); 1616 1617 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1618 assert(m != NULL, "cannot find method"); 1619 return m; // caller has to deal with NULL in product mode 1620 } 1621 1622 /* Type use annotations support (JDK 1.8) */ 1623 1624 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1625 assert (cls != NULL, "illegal class"); 1626 JVMWrapper("JVM_GetClassTypeAnnotations"); 1627 ResourceMark rm(THREAD); 1628 // Return null for arrays and primitives 1629 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1630 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1631 if (k->is_instance_klass()) { 1632 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1633 if (type_annotations != NULL) { 1634 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1635 return (jbyteArray) JNIHandles::make_local(env, a); 1636 } 1637 } 1638 } 1639 return NULL; 1640 JVM_END 1641 1642 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1643 assert (method != NULL, "illegal method"); 1644 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1645 1646 // method is a handle to a java.lang.reflect.Method object 1647 Method* m = jvm_get_method_common(method); 1648 if (m == NULL) { 1649 return NULL; 1650 } 1651 1652 AnnotationArray* type_annotations = m->type_annotations(); 1653 if (type_annotations != NULL) { 1654 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1655 return (jbyteArray) JNIHandles::make_local(env, a); 1656 } 1657 1658 return NULL; 1659 JVM_END 1660 1661 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1662 assert (field != NULL, "illegal field"); 1663 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1664 1665 fieldDescriptor fd; 1666 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1667 if (!gotFd) { 1668 return NULL; 1669 } 1670 1671 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1672 JVM_END 1673 1674 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1675 if (!cp->is_within_bounds(index)) { 1676 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1677 } 1678 } 1679 1680 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1681 { 1682 JVMWrapper("JVM_GetMethodParameters"); 1683 // method is a handle to a java.lang.reflect.Method object 1684 Method* method_ptr = jvm_get_method_common(method); 1685 methodHandle mh (THREAD, method_ptr); 1686 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1687 const int num_params = mh->method_parameters_length(); 1688 1689 if (num_params < 0) { 1690 // A -1 return value from method_parameters_length means there is no 1691 // parameter data. Return null to indicate this to the reflection 1692 // API. 1693 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1694 return (jobjectArray)NULL; 1695 } else { 1696 // Otherwise, we return something up to reflection, even if it is 1697 // a zero-length array. Why? Because in some cases this can 1698 // trigger a MalformedParametersException. 1699 1700 // make sure all the symbols are properly formatted 1701 for (int i = 0; i < num_params; i++) { 1702 MethodParametersElement* params = mh->method_parameters_start(); 1703 int index = params[i].name_cp_index; 1704 bounds_check(mh->constants(), index, CHECK_NULL); 1705 1706 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1707 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1708 "Wrong type at constant pool index"); 1709 } 1710 1711 } 1712 1713 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1714 objArrayHandle result (THREAD, result_oop); 1715 1716 for (int i = 0; i < num_params; i++) { 1717 MethodParametersElement* params = mh->method_parameters_start(); 1718 // For a 0 index, give a NULL symbol 1719 Symbol* sym = 0 != params[i].name_cp_index ? 1720 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1721 int flags = params[i].flags; 1722 oop param = Reflection::new_parameter(reflected_method, i, sym, 1723 flags, CHECK_NULL); 1724 result->obj_at_put(i, param); 1725 } 1726 return (jobjectArray)JNIHandles::make_local(env, result()); 1727 } 1728 } 1729 JVM_END 1730 1731 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1732 1733 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1734 { 1735 JVMWrapper("JVM_GetClassDeclaredFields"); 1736 JvmtiVMObjectAllocEventCollector oam; 1737 1738 // Exclude primitive types and array types 1739 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1740 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1741 // Return empty array 1742 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1743 return (jobjectArray) JNIHandles::make_local(env, res); 1744 } 1745 1746 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1747 constantPoolHandle cp(THREAD, k->constants()); 1748 1749 // Ensure class is linked 1750 k->link_class(CHECK_NULL); 1751 1752 // Allocate result 1753 int num_fields; 1754 1755 if (publicOnly) { 1756 num_fields = 0; 1757 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1758 if (fs.access_flags().is_public()) ++num_fields; 1759 } 1760 } else { 1761 num_fields = k->java_fields_count(); 1762 } 1763 1764 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1765 objArrayHandle result (THREAD, r); 1766 1767 int out_idx = 0; 1768 fieldDescriptor fd; 1769 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1770 if (!publicOnly || fs.access_flags().is_public()) { 1771 fd.reinitialize(k, fs.index()); 1772 oop field = Reflection::new_field(&fd, CHECK_NULL); 1773 result->obj_at_put(out_idx, field); 1774 ++out_idx; 1775 } 1776 } 1777 assert(out_idx == num_fields, "just checking"); 1778 return (jobjectArray) JNIHandles::make_local(env, result()); 1779 } 1780 JVM_END 1781 1782 static bool select_method(const methodHandle& method, bool want_constructor) { 1783 if (want_constructor) { 1784 return (method->is_initializer() && !method->is_static()); 1785 } else { 1786 return (!method->is_initializer() && !method->is_overpass()); 1787 } 1788 } 1789 1790 static jobjectArray get_class_declared_methods_helper( 1791 JNIEnv *env, 1792 jclass ofClass, jboolean publicOnly, 1793 bool want_constructor, 1794 Klass* klass, TRAPS) { 1795 1796 JvmtiVMObjectAllocEventCollector oam; 1797 1798 // Exclude primitive types and array types 1799 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1800 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1801 // Return empty array 1802 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1803 return (jobjectArray) JNIHandles::make_local(env, res); 1804 } 1805 1806 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1807 1808 // Ensure class is linked 1809 k->link_class(CHECK_NULL); 1810 1811 Array<Method*>* methods = k->methods(); 1812 int methods_length = methods->length(); 1813 1814 // Save original method_idnum in case of redefinition, which can change 1815 // the idnum of obsolete methods. The new method will have the same idnum 1816 // but if we refresh the methods array, the counts will be wrong. 1817 ResourceMark rm(THREAD); 1818 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1819 int num_methods = 0; 1820 1821 for (int i = 0; i < methods_length; i++) { 1822 methodHandle method(THREAD, methods->at(i)); 1823 if (select_method(method, want_constructor)) { 1824 if (!publicOnly || method->is_public()) { 1825 idnums->push(method->method_idnum()); 1826 ++num_methods; 1827 } 1828 } 1829 } 1830 1831 // Allocate result 1832 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1833 objArrayHandle result (THREAD, r); 1834 1835 // Now just put the methods that we selected above, but go by their idnum 1836 // in case of redefinition. The methods can be redefined at any safepoint, 1837 // so above when allocating the oop array and below when creating reflect 1838 // objects. 1839 for (int i = 0; i < num_methods; i++) { 1840 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1841 if (method.is_null()) { 1842 // Method may have been deleted and seems this API can handle null 1843 // Otherwise should probably put a method that throws NSME 1844 result->obj_at_put(i, NULL); 1845 } else { 1846 oop m; 1847 if (want_constructor) { 1848 m = Reflection::new_constructor(method, CHECK_NULL); 1849 } else { 1850 m = Reflection::new_method(method, false, CHECK_NULL); 1851 } 1852 result->obj_at_put(i, m); 1853 } 1854 } 1855 1856 return (jobjectArray) JNIHandles::make_local(env, result()); 1857 } 1858 1859 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1860 { 1861 JVMWrapper("JVM_GetClassDeclaredMethods"); 1862 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1863 /*want_constructor*/ false, 1864 SystemDictionary::reflect_Method_klass(), THREAD); 1865 } 1866 JVM_END 1867 1868 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1869 { 1870 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1871 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1872 /*want_constructor*/ true, 1873 SystemDictionary::reflect_Constructor_klass(), THREAD); 1874 } 1875 JVM_END 1876 1877 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1878 { 1879 JVMWrapper("JVM_GetClassAccessFlags"); 1880 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1881 // Primitive type 1882 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1883 } 1884 1885 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1886 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1887 } 1888 JVM_END 1889 1890 1891 // Constant pool access ////////////////////////////////////////////////////////// 1892 1893 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1894 { 1895 JVMWrapper("JVM_GetClassConstantPool"); 1896 JvmtiVMObjectAllocEventCollector oam; 1897 1898 // Return null for primitives and arrays 1899 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1900 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1901 if (k->is_instance_klass()) { 1902 InstanceKlass* k_h = InstanceKlass::cast(k); 1903 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1904 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1905 return JNIHandles::make_local(jcp()); 1906 } 1907 } 1908 return NULL; 1909 } 1910 JVM_END 1911 1912 1913 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1914 { 1915 JVMWrapper("JVM_ConstantPoolGetSize"); 1916 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1917 return cp->length(); 1918 } 1919 JVM_END 1920 1921 1922 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1923 { 1924 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1925 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1926 bounds_check(cp, index, CHECK_NULL); 1927 constantTag tag = cp->tag_at(index); 1928 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1929 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1930 } 1931 Klass* k = cp->klass_at(index, CHECK_NULL); 1932 return (jclass) JNIHandles::make_local(k->java_mirror()); 1933 } 1934 JVM_END 1935 1936 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1937 { 1938 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1939 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1940 bounds_check(cp, index, CHECK_NULL); 1941 constantTag tag = cp->tag_at(index); 1942 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1943 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1944 } 1945 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1946 if (k == NULL) return NULL; 1947 return (jclass) JNIHandles::make_local(k->java_mirror()); 1948 } 1949 JVM_END 1950 1951 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 1952 constantTag tag = cp->tag_at(index); 1953 if (!tag.is_method() && !tag.is_interface_method()) { 1954 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1955 } 1956 int klass_ref = cp->uncached_klass_ref_index_at(index); 1957 Klass* k_o; 1958 if (force_resolution) { 1959 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1960 } else { 1961 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1962 if (k_o == NULL) return NULL; 1963 } 1964 InstanceKlass* k = InstanceKlass::cast(k_o); 1965 Symbol* name = cp->uncached_name_ref_at(index); 1966 Symbol* sig = cp->uncached_signature_ref_at(index); 1967 methodHandle m (THREAD, k->find_method(name, sig)); 1968 if (m.is_null()) { 1969 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1970 } 1971 oop method; 1972 if (!m->is_initializer() || m->is_static()) { 1973 method = Reflection::new_method(m, true, CHECK_NULL); 1974 } else { 1975 method = Reflection::new_constructor(m, CHECK_NULL); 1976 } 1977 return JNIHandles::make_local(method); 1978 } 1979 1980 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1981 { 1982 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1983 JvmtiVMObjectAllocEventCollector oam; 1984 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1985 bounds_check(cp, index, CHECK_NULL); 1986 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1987 return res; 1988 } 1989 JVM_END 1990 1991 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1992 { 1993 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 1994 JvmtiVMObjectAllocEventCollector oam; 1995 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1996 bounds_check(cp, index, CHECK_NULL); 1997 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 1998 return res; 1999 } 2000 JVM_END 2001 2002 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2003 constantTag tag = cp->tag_at(index); 2004 if (!tag.is_field()) { 2005 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2006 } 2007 int klass_ref = cp->uncached_klass_ref_index_at(index); 2008 Klass* k_o; 2009 if (force_resolution) { 2010 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2011 } else { 2012 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2013 if (k_o == NULL) return NULL; 2014 } 2015 InstanceKlass* k = InstanceKlass::cast(k_o); 2016 Symbol* name = cp->uncached_name_ref_at(index); 2017 Symbol* sig = cp->uncached_signature_ref_at(index); 2018 fieldDescriptor fd; 2019 Klass* target_klass = k->find_field(name, sig, &fd); 2020 if (target_klass == NULL) { 2021 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2022 } 2023 oop field = Reflection::new_field(&fd, CHECK_NULL); 2024 return JNIHandles::make_local(field); 2025 } 2026 2027 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2028 { 2029 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2030 JvmtiVMObjectAllocEventCollector oam; 2031 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2032 bounds_check(cp, index, CHECK_NULL); 2033 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2034 return res; 2035 } 2036 JVM_END 2037 2038 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2039 { 2040 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2041 JvmtiVMObjectAllocEventCollector oam; 2042 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2043 bounds_check(cp, index, CHECK_NULL); 2044 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2045 return res; 2046 } 2047 JVM_END 2048 2049 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2050 { 2051 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2052 JvmtiVMObjectAllocEventCollector oam; 2053 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2054 bounds_check(cp, index, CHECK_NULL); 2055 constantTag tag = cp->tag_at(index); 2056 if (!tag.is_field_or_method()) { 2057 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2058 } 2059 int klass_ref = cp->uncached_klass_ref_index_at(index); 2060 Symbol* klass_name = cp->klass_name_at(klass_ref); 2061 Symbol* member_name = cp->uncached_name_ref_at(index); 2062 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2063 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2064 objArrayHandle dest(THREAD, dest_o); 2065 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2066 dest->obj_at_put(0, str()); 2067 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2068 dest->obj_at_put(1, str()); 2069 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2070 dest->obj_at_put(2, str()); 2071 return (jobjectArray) JNIHandles::make_local(dest()); 2072 } 2073 JVM_END 2074 2075 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2076 { 2077 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2078 JvmtiVMObjectAllocEventCollector oam; 2079 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2080 bounds_check(cp, index, CHECK_0); 2081 constantTag tag = cp->tag_at(index); 2082 if (!tag.is_field_or_method()) { 2083 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2084 } 2085 return (jint) cp->uncached_klass_ref_index_at(index); 2086 } 2087 JVM_END 2088 2089 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2090 { 2091 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2092 JvmtiVMObjectAllocEventCollector oam; 2093 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2094 bounds_check(cp, index, CHECK_0); 2095 constantTag tag = cp->tag_at(index); 2096 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2097 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2098 } 2099 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2100 } 2101 JVM_END 2102 2103 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2104 { 2105 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2106 JvmtiVMObjectAllocEventCollector oam; 2107 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2108 bounds_check(cp, index, CHECK_NULL); 2109 constantTag tag = cp->tag_at(index); 2110 if (!tag.is_name_and_type()) { 2111 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2112 } 2113 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2114 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2115 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2116 objArrayHandle dest(THREAD, dest_o); 2117 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2118 dest->obj_at_put(0, str()); 2119 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2120 dest->obj_at_put(1, str()); 2121 return (jobjectArray) JNIHandles::make_local(dest()); 2122 } 2123 JVM_END 2124 2125 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2126 { 2127 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2128 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2129 bounds_check(cp, index, CHECK_0); 2130 constantTag tag = cp->tag_at(index); 2131 if (!tag.is_int()) { 2132 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2133 } 2134 return cp->int_at(index); 2135 } 2136 JVM_END 2137 2138 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2139 { 2140 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2141 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2142 bounds_check(cp, index, CHECK_(0L)); 2143 constantTag tag = cp->tag_at(index); 2144 if (!tag.is_long()) { 2145 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2146 } 2147 return cp->long_at(index); 2148 } 2149 JVM_END 2150 2151 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2152 { 2153 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2154 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2155 bounds_check(cp, index, CHECK_(0.0f)); 2156 constantTag tag = cp->tag_at(index); 2157 if (!tag.is_float()) { 2158 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2159 } 2160 return cp->float_at(index); 2161 } 2162 JVM_END 2163 2164 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2165 { 2166 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2167 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2168 bounds_check(cp, index, CHECK_(0.0)); 2169 constantTag tag = cp->tag_at(index); 2170 if (!tag.is_double()) { 2171 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2172 } 2173 return cp->double_at(index); 2174 } 2175 JVM_END 2176 2177 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2178 { 2179 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2180 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2181 bounds_check(cp, index, CHECK_NULL); 2182 constantTag tag = cp->tag_at(index); 2183 if (!tag.is_string()) { 2184 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2185 } 2186 oop str = cp->string_at(index, CHECK_NULL); 2187 return (jstring) JNIHandles::make_local(str); 2188 } 2189 JVM_END 2190 2191 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2192 { 2193 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2194 JvmtiVMObjectAllocEventCollector oam; 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_symbol()) { 2199 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2200 } 2201 Symbol* sym = cp->symbol_at(index); 2202 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2203 return (jstring) JNIHandles::make_local(str()); 2204 } 2205 JVM_END 2206 2207 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2208 { 2209 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2210 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2211 bounds_check(cp, index, CHECK_0); 2212 constantTag tag = cp->tag_at(index); 2213 jbyte result = tag.value(); 2214 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2215 // they are changed to the corresponding tags from the JVM spec, so that java code in 2216 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2217 if (tag.is_klass_or_reference()) { 2218 result = JVM_CONSTANT_Class; 2219 } else if (tag.is_string_index()) { 2220 result = JVM_CONSTANT_String; 2221 } else if (tag.is_method_type_in_error()) { 2222 result = JVM_CONSTANT_MethodType; 2223 } else if (tag.is_method_handle_in_error()) { 2224 result = JVM_CONSTANT_MethodHandle; 2225 } else if (tag.is_dynamic_constant_in_error()) { 2226 result = JVM_CONSTANT_Dynamic; 2227 } 2228 return result; 2229 } 2230 JVM_END 2231 2232 // Assertion support. ////////////////////////////////////////////////////////// 2233 2234 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2235 JVMWrapper("JVM_DesiredAssertionStatus"); 2236 assert(cls != NULL, "bad class"); 2237 2238 oop r = JNIHandles::resolve(cls); 2239 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2240 if (java_lang_Class::is_primitive(r)) return false; 2241 2242 Klass* k = java_lang_Class::as_Klass(r); 2243 assert(k->is_instance_klass(), "must be an instance klass"); 2244 if (!k->is_instance_klass()) return false; 2245 2246 ResourceMark rm(THREAD); 2247 const char* name = k->name()->as_C_string(); 2248 bool system_class = k->class_loader() == NULL; 2249 return JavaAssertions::enabled(name, system_class); 2250 2251 JVM_END 2252 2253 2254 // Return a new AssertionStatusDirectives object with the fields filled in with 2255 // command-line assertion arguments (i.e., -ea, -da). 2256 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2257 JVMWrapper("JVM_AssertionStatusDirectives"); 2258 JvmtiVMObjectAllocEventCollector oam; 2259 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2260 return JNIHandles::make_local(env, asd); 2261 JVM_END 2262 2263 // Verification //////////////////////////////////////////////////////////////////////////////// 2264 2265 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2266 2267 // RedefineClasses support: bug 6214132 caused verification to fail. 2268 // All functions from this section should call the jvmtiThreadSate function: 2269 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2270 // The function returns a Klass* of the _scratch_class if the verifier 2271 // was invoked in the middle of the class redefinition. 2272 // Otherwise it returns its argument value which is the _the_class Klass*. 2273 // Please, refer to the description in the jvmtiThreadSate.hpp. 2274 2275 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2276 JVMWrapper("JVM_GetClassNameUTF"); 2277 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2278 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2279 return k->name()->as_utf8(); 2280 JVM_END 2281 2282 2283 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2284 JVMWrapper("JVM_GetClassCPTypes"); 2285 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2286 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2287 // types will have length zero if this is not an InstanceKlass 2288 // (length is determined by call to JVM_GetClassCPEntriesCount) 2289 if (k->is_instance_klass()) { 2290 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2291 for (int index = cp->length() - 1; index >= 0; index--) { 2292 constantTag tag = cp->tag_at(index); 2293 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2294 } 2295 } 2296 JVM_END 2297 2298 2299 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2300 JVMWrapper("JVM_GetClassCPEntriesCount"); 2301 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2302 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2303 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2304 JVM_END 2305 2306 2307 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2308 JVMWrapper("JVM_GetClassFieldsCount"); 2309 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2310 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2311 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2312 JVM_END 2313 2314 2315 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2316 JVMWrapper("JVM_GetClassMethodsCount"); 2317 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2318 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2319 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2320 JVM_END 2321 2322 2323 // The following methods, used for the verifier, are never called with 2324 // array klasses, so a direct cast to InstanceKlass is safe. 2325 // Typically, these methods are called in a loop with bounds determined 2326 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2327 // zero for arrays. 2328 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2329 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2330 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2331 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2332 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2333 int length = method->checked_exceptions_length(); 2334 if (length > 0) { 2335 CheckedExceptionElement* table= method->checked_exceptions_start(); 2336 for (int i = 0; i < length; i++) { 2337 exceptions[i] = table[i].class_cp_index; 2338 } 2339 } 2340 JVM_END 2341 2342 2343 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2344 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2345 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2346 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2347 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2348 return method->checked_exceptions_length(); 2349 JVM_END 2350 2351 2352 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2353 JVMWrapper("JVM_GetMethodIxByteCode"); 2354 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2355 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2356 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2357 memcpy(code, method->code_base(), method->code_size()); 2358 JVM_END 2359 2360 2361 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2362 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2363 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2364 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2365 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2366 return method->code_size(); 2367 JVM_END 2368 2369 2370 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2371 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2372 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2373 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2374 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2375 ExceptionTable extable(method); 2376 entry->start_pc = extable.start_pc(entry_index); 2377 entry->end_pc = extable.end_pc(entry_index); 2378 entry->handler_pc = extable.handler_pc(entry_index); 2379 entry->catchType = extable.catch_type_index(entry_index); 2380 JVM_END 2381 2382 2383 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2384 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 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 return method->exception_table_length(); 2389 JVM_END 2390 2391 2392 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2393 JVMWrapper("JVM_GetMethodIxModifiers"); 2394 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2395 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2396 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2397 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2398 JVM_END 2399 2400 2401 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2402 JVMWrapper("JVM_GetFieldIxModifiers"); 2403 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2404 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2405 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2406 JVM_END 2407 2408 2409 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2410 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2411 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2412 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2413 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2414 return method->max_locals(); 2415 JVM_END 2416 2417 2418 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2419 JVMWrapper("JVM_GetMethodIxArgsSize"); 2420 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2421 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2422 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2423 return method->size_of_parameters(); 2424 JVM_END 2425 2426 2427 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2428 JVMWrapper("JVM_GetMethodIxMaxStack"); 2429 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2430 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2431 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2432 return method->verifier_max_stack(); 2433 JVM_END 2434 2435 2436 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2437 JVMWrapper("JVM_IsConstructorIx"); 2438 ResourceMark rm(THREAD); 2439 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2440 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2441 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2442 return method->name() == vmSymbols::object_initializer_name(); 2443 JVM_END 2444 2445 2446 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2447 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2448 ResourceMark rm(THREAD); 2449 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2450 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2451 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2452 return method->is_overpass(); 2453 JVM_END 2454 2455 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2456 JVMWrapper("JVM_GetMethodIxIxUTF"); 2457 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2458 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2459 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2460 return method->name()->as_utf8(); 2461 JVM_END 2462 2463 2464 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2465 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2466 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2467 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2468 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2469 return method->signature()->as_utf8(); 2470 JVM_END 2471 2472 /** 2473 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2474 * read entries in the constant pool. Since the old verifier always 2475 * works on a copy of the code, it will not see any rewriting that 2476 * may possibly occur in the middle of verification. So it is important 2477 * that nothing it calls tries to use the cpCache instead of the raw 2478 * constant pool, so we must use cp->uncached_x methods when appropriate. 2479 */ 2480 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2481 JVMWrapper("JVM_GetCPFieldNameUTF"); 2482 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2483 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2484 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2485 switch (cp->tag_at(cp_index).value()) { 2486 case JVM_CONSTANT_Fieldref: 2487 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2488 default: 2489 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2490 } 2491 ShouldNotReachHere(); 2492 return NULL; 2493 JVM_END 2494 2495 2496 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2497 JVMWrapper("JVM_GetCPMethodNameUTF"); 2498 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2499 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2500 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2501 switch (cp->tag_at(cp_index).value()) { 2502 case JVM_CONSTANT_InterfaceMethodref: 2503 case JVM_CONSTANT_Methodref: 2504 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2505 default: 2506 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2507 } 2508 ShouldNotReachHere(); 2509 return NULL; 2510 JVM_END 2511 2512 2513 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2514 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2515 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2516 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2517 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2518 switch (cp->tag_at(cp_index).value()) { 2519 case JVM_CONSTANT_InterfaceMethodref: 2520 case JVM_CONSTANT_Methodref: 2521 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2522 default: 2523 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2524 } 2525 ShouldNotReachHere(); 2526 return NULL; 2527 JVM_END 2528 2529 2530 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2531 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2532 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2533 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2534 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2535 switch (cp->tag_at(cp_index).value()) { 2536 case JVM_CONSTANT_Fieldref: 2537 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2538 default: 2539 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2540 } 2541 ShouldNotReachHere(); 2542 return NULL; 2543 JVM_END 2544 2545 2546 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2547 JVMWrapper("JVM_GetCPClassNameUTF"); 2548 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2549 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2550 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2551 Symbol* classname = cp->klass_name_at(cp_index); 2552 return classname->as_utf8(); 2553 JVM_END 2554 2555 2556 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2557 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2558 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2559 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2560 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2561 switch (cp->tag_at(cp_index).value()) { 2562 case JVM_CONSTANT_Fieldref: { 2563 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2564 Symbol* classname = cp->klass_name_at(class_index); 2565 return classname->as_utf8(); 2566 } 2567 default: 2568 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2569 } 2570 ShouldNotReachHere(); 2571 return NULL; 2572 JVM_END 2573 2574 2575 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2576 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2577 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2578 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2579 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2580 switch (cp->tag_at(cp_index).value()) { 2581 case JVM_CONSTANT_Methodref: 2582 case JVM_CONSTANT_InterfaceMethodref: { 2583 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2584 Symbol* classname = cp->klass_name_at(class_index); 2585 return classname->as_utf8(); 2586 } 2587 default: 2588 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2589 } 2590 ShouldNotReachHere(); 2591 return NULL; 2592 JVM_END 2593 2594 2595 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2596 JVMWrapper("JVM_GetCPFieldModifiers"); 2597 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2598 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2599 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2600 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2601 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2602 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2603 switch (cp->tag_at(cp_index).value()) { 2604 case JVM_CONSTANT_Fieldref: { 2605 Symbol* name = cp->uncached_name_ref_at(cp_index); 2606 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2607 InstanceKlass* ik = InstanceKlass::cast(k_called); 2608 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2609 if (fs.name() == name && fs.signature() == signature) { 2610 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2611 } 2612 } 2613 return -1; 2614 } 2615 default: 2616 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2617 } 2618 ShouldNotReachHere(); 2619 return 0; 2620 JVM_END 2621 2622 2623 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2624 JVMWrapper("JVM_GetCPMethodModifiers"); 2625 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2626 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2627 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2628 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2629 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2630 switch (cp->tag_at(cp_index).value()) { 2631 case JVM_CONSTANT_Methodref: 2632 case JVM_CONSTANT_InterfaceMethodref: { 2633 Symbol* name = cp->uncached_name_ref_at(cp_index); 2634 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2635 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2636 int methods_count = methods->length(); 2637 for (int i = 0; i < methods_count; i++) { 2638 Method* method = methods->at(i); 2639 if (method->name() == name && method->signature() == signature) { 2640 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2641 } 2642 } 2643 return -1; 2644 } 2645 default: 2646 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2647 } 2648 ShouldNotReachHere(); 2649 return 0; 2650 JVM_END 2651 2652 2653 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2654 2655 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2656 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2657 JVM_END 2658 2659 2660 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2661 JVMWrapper("JVM_IsSameClassPackage"); 2662 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2663 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2664 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2665 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2666 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2667 JVM_END 2668 2669 // Printing support ////////////////////////////////////////////////// 2670 extern "C" { 2671 2672 ATTRIBUTE_PRINTF(3, 0) 2673 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2674 // Reject count values that are negative signed values converted to 2675 // unsigned; see bug 4399518, 4417214 2676 if ((intptr_t)count <= 0) return -1; 2677 2678 int result = os::vsnprintf(str, count, fmt, args); 2679 if (result > 0 && (size_t)result >= count) { 2680 result = -1; 2681 } 2682 2683 return result; 2684 } 2685 2686 ATTRIBUTE_PRINTF(3, 4) 2687 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2688 va_list args; 2689 int len; 2690 va_start(args, fmt); 2691 len = jio_vsnprintf(str, count, fmt, args); 2692 va_end(args); 2693 return len; 2694 } 2695 2696 ATTRIBUTE_PRINTF(2, 3) 2697 int jio_fprintf(FILE* f, const char *fmt, ...) { 2698 int len; 2699 va_list args; 2700 va_start(args, fmt); 2701 len = jio_vfprintf(f, fmt, args); 2702 va_end(args); 2703 return len; 2704 } 2705 2706 ATTRIBUTE_PRINTF(2, 0) 2707 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2708 if (Arguments::vfprintf_hook() != NULL) { 2709 return Arguments::vfprintf_hook()(f, fmt, args); 2710 } else { 2711 return vfprintf(f, fmt, args); 2712 } 2713 } 2714 2715 ATTRIBUTE_PRINTF(1, 2) 2716 JNIEXPORT int jio_printf(const char *fmt, ...) { 2717 int len; 2718 va_list args; 2719 va_start(args, fmt); 2720 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2721 va_end(args); 2722 return len; 2723 } 2724 2725 2726 // HotSpot specific jio method 2727 void jio_print(const char* s) { 2728 // Try to make this function as atomic as possible. 2729 if (Arguments::vfprintf_hook() != NULL) { 2730 jio_fprintf(defaultStream::output_stream(), "%s", s); 2731 } else { 2732 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2733 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2734 } 2735 } 2736 2737 } // Extern C 2738 2739 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2740 2741 // In most of the JVM thread support functions we need to access the 2742 // thread through a ThreadsListHandle to prevent it from exiting and 2743 // being reclaimed while we try to operate on it. The exceptions to this 2744 // rule are when operating on the current thread, or if the monitor of 2745 // the target java.lang.Thread is locked at the Java level - in both 2746 // cases the target cannot exit. 2747 2748 static void thread_entry(JavaThread* thread, TRAPS) { 2749 HandleMark hm(THREAD); 2750 Handle obj(THREAD, thread->threadObj()); 2751 JavaValue result(T_VOID); 2752 JavaCalls::call_virtual(&result, 2753 obj, 2754 SystemDictionary::Thread_klass(), 2755 vmSymbols::run_method_name(), 2756 vmSymbols::void_method_signature(), 2757 THREAD); 2758 } 2759 2760 2761 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2762 JVMWrapper("JVM_StartThread"); 2763 JavaThread *native_thread = NULL; 2764 2765 // We cannot hold the Threads_lock when we throw an exception, 2766 // due to rank ordering issues. Example: we might need to grab the 2767 // Heap_lock while we construct the exception. 2768 bool throw_illegal_thread_state = false; 2769 2770 // We must release the Threads_lock before we can post a jvmti event 2771 // in Thread::start. 2772 { 2773 // Ensure that the C++ Thread and OSThread structures aren't freed before 2774 // we operate. 2775 MutexLocker mu(Threads_lock); 2776 2777 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2778 // re-starting an already started thread, so we should usually find 2779 // that the JavaThread is null. However for a JNI attached thread 2780 // there is a small window between the Thread object being created 2781 // (with its JavaThread set) and the update to its threadStatus, so we 2782 // have to check for this 2783 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2784 throw_illegal_thread_state = true; 2785 } else { 2786 // We could also check the stillborn flag to see if this thread was already stopped, but 2787 // for historical reasons we let the thread detect that itself when it starts running 2788 2789 jlong size = 2790 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2791 // Allocate the C++ Thread structure and create the native thread. The 2792 // stack size retrieved from java is 64-bit signed, but the constructor takes 2793 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2794 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2795 // - Avoid passing negative values which would result in really large stacks. 2796 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2797 size_t sz = size > 0 ? (size_t) size : 0; 2798 native_thread = new JavaThread(&thread_entry, sz); 2799 2800 // At this point it may be possible that no osthread was created for the 2801 // JavaThread due to lack of memory. Check for this situation and throw 2802 // an exception if necessary. Eventually we may want to change this so 2803 // that we only grab the lock if the thread was created successfully - 2804 // then we can also do this check and throw the exception in the 2805 // JavaThread constructor. 2806 if (native_thread->osthread() != NULL) { 2807 // Note: the current thread is not being used within "prepare". 2808 native_thread->prepare(jthread); 2809 } 2810 } 2811 } 2812 2813 if (throw_illegal_thread_state) { 2814 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2815 } 2816 2817 assert(native_thread != NULL, "Starting null thread?"); 2818 2819 if (native_thread->osthread() == NULL) { 2820 // No one should hold a reference to the 'native_thread'. 2821 native_thread->smr_delete(); 2822 if (JvmtiExport::should_post_resource_exhausted()) { 2823 JvmtiExport::post_resource_exhausted( 2824 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2825 os::native_thread_creation_failed_msg()); 2826 } 2827 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2828 os::native_thread_creation_failed_msg()); 2829 } 2830 2831 Thread::start(native_thread); 2832 2833 JVM_END 2834 2835 2836 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2837 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2838 // but is thought to be reliable and simple. In the case, where the receiver is the 2839 // same thread as the sender, no VM_Operation is needed. 2840 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2841 JVMWrapper("JVM_StopThread"); 2842 2843 // A nested ThreadsListHandle will grab the Threads_lock so create 2844 // tlh before we resolve throwable. 2845 ThreadsListHandle tlh(thread); 2846 oop java_throwable = JNIHandles::resolve(throwable); 2847 if (java_throwable == NULL) { 2848 THROW(vmSymbols::java_lang_NullPointerException()); 2849 } 2850 oop java_thread = NULL; 2851 JavaThread* receiver = NULL; 2852 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2853 Events::log_exception(thread, 2854 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2855 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2856 2857 if (is_alive) { 2858 // jthread refers to a live JavaThread. 2859 if (thread == receiver) { 2860 // Exception is getting thrown at self so no VM_Operation needed. 2861 THROW_OOP(java_throwable); 2862 } else { 2863 // Use a VM_Operation to throw the exception. 2864 Thread::send_async_exception(java_thread, java_throwable); 2865 } 2866 } else { 2867 // Either: 2868 // - target thread has not been started before being stopped, or 2869 // - target thread already terminated 2870 // We could read the threadStatus to determine which case it is 2871 // but that is overkill as it doesn't matter. We must set the 2872 // stillborn flag for the first case, and if the thread has already 2873 // exited setting this flag has no effect. 2874 java_lang_Thread::set_stillborn(java_thread); 2875 } 2876 JVM_END 2877 2878 2879 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2880 JVMWrapper("JVM_IsThreadAlive"); 2881 2882 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2883 return java_lang_Thread::is_alive(thread_oop); 2884 JVM_END 2885 2886 2887 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2888 JVMWrapper("JVM_SuspendThread"); 2889 2890 ThreadsListHandle tlh(thread); 2891 JavaThread* receiver = NULL; 2892 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2893 if (is_alive) { 2894 // jthread refers to a live JavaThread. 2895 { 2896 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2897 if (receiver->is_external_suspend()) { 2898 // Don't allow nested external suspend requests. We can't return 2899 // an error from this interface so just ignore the problem. 2900 return; 2901 } 2902 if (receiver->is_exiting()) { // thread is in the process of exiting 2903 return; 2904 } 2905 receiver->set_external_suspend(); 2906 } 2907 2908 // java_suspend() will catch threads in the process of exiting 2909 // and will ignore them. 2910 receiver->java_suspend(); 2911 2912 // It would be nice to have the following assertion in all the 2913 // time, but it is possible for a racing resume request to have 2914 // resumed this thread right after we suspended it. Temporarily 2915 // enable this assertion if you are chasing a different kind of 2916 // bug. 2917 // 2918 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2919 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2920 } 2921 JVM_END 2922 2923 2924 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2925 JVMWrapper("JVM_ResumeThread"); 2926 2927 ThreadsListHandle tlh(thread); 2928 JavaThread* receiver = NULL; 2929 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2930 if (is_alive) { 2931 // jthread refers to a live JavaThread. 2932 2933 // This is the original comment for this Threads_lock grab: 2934 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2935 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2936 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2937 // looks at it. 2938 // 2939 // The above comment dates back to when we had both internal and 2940 // external suspend APIs that shared a common underlying mechanism. 2941 // External suspend is now entirely cooperative and doesn't share 2942 // anything with internal suspend. That said, there are some 2943 // assumptions in the VM that an external resume grabs the 2944 // Threads_lock. We can't drop the Threads_lock grab here until we 2945 // resolve the assumptions that exist elsewhere. 2946 // 2947 MutexLocker ml(Threads_lock); 2948 receiver->java_resume(); 2949 } 2950 JVM_END 2951 2952 2953 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2954 JVMWrapper("JVM_SetThreadPriority"); 2955 2956 ThreadsListHandle tlh(thread); 2957 oop java_thread = NULL; 2958 JavaThread* receiver = NULL; 2959 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2960 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2961 2962 if (is_alive) { 2963 // jthread refers to a live JavaThread. 2964 Thread::set_priority(receiver, (ThreadPriority)prio); 2965 } 2966 // Implied else: If the JavaThread hasn't started yet, then the 2967 // priority set in the java.lang.Thread object above will be pushed 2968 // down when it does start. 2969 JVM_END 2970 2971 2972 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2973 JVMWrapper("JVM_Yield"); 2974 if (os::dont_yield()) return; 2975 HOTSPOT_THREAD_YIELD(); 2976 os::naked_yield(); 2977 JVM_END 2978 2979 2980 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2981 JVMWrapper("JVM_Sleep"); 2982 2983 if (millis < 0) { 2984 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2985 } 2986 2987 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2988 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2989 } 2990 2991 // Save current thread state and restore it at the end of this block. 2992 // And set new thread state to SLEEPING. 2993 JavaThreadSleepState jtss(thread); 2994 2995 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 2996 2997 EventThreadSleep event; 2998 2999 if (millis == 0) { 3000 os::naked_yield(); 3001 } else { 3002 ThreadState old_state = thread->osthread()->get_state(); 3003 thread->osthread()->set_state(SLEEPING); 3004 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3005 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3006 // us while we were sleeping. We do not overwrite those. 3007 if (!HAS_PENDING_EXCEPTION) { 3008 if (event.should_commit()) { 3009 event.set_time(millis); 3010 event.commit(); 3011 } 3012 HOTSPOT_THREAD_SLEEP_END(1); 3013 3014 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3015 // to properly restore the thread state. That's likely wrong. 3016 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3017 } 3018 } 3019 thread->osthread()->set_state(old_state); 3020 } 3021 if (event.should_commit()) { 3022 event.set_time(millis); 3023 event.commit(); 3024 } 3025 HOTSPOT_THREAD_SLEEP_END(0); 3026 JVM_END 3027 3028 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3029 JVMWrapper("JVM_CurrentThread"); 3030 oop jthread = thread->threadObj(); 3031 assert (thread != NULL, "no current thread!"); 3032 return JNIHandles::make_local(env, jthread); 3033 JVM_END 3034 3035 3036 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3037 JVMWrapper("JVM_CountStackFrames"); 3038 3039 uint32_t debug_bits = 0; 3040 ThreadsListHandle tlh(thread); 3041 JavaThread* receiver = NULL; 3042 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3043 int count = 0; 3044 if (is_alive) { 3045 // jthread refers to a live JavaThread. 3046 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) { 3047 // Count all java activation, i.e., number of vframes. 3048 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) { 3049 // Native frames are not counted. 3050 if (!vfst.method()->is_native()) count++; 3051 } 3052 } else { 3053 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3054 "this thread is not suspended"); 3055 } 3056 } 3057 // Implied else: if JavaThread is not alive simply return a count of 0. 3058 3059 return count; 3060 JVM_END 3061 3062 3063 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3064 JVMWrapper("JVM_Interrupt"); 3065 3066 ThreadsListHandle tlh(thread); 3067 JavaThread* receiver = NULL; 3068 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3069 if (is_alive) { 3070 // jthread refers to a live JavaThread. 3071 Thread::interrupt(receiver); 3072 } 3073 JVM_END 3074 3075 3076 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3077 JVMWrapper("JVM_IsInterrupted"); 3078 3079 ThreadsListHandle tlh(thread); 3080 JavaThread* receiver = NULL; 3081 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3082 if (is_alive) { 3083 // jthread refers to a live JavaThread. 3084 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0); 3085 } else { 3086 return JNI_FALSE; 3087 } 3088 JVM_END 3089 3090 3091 // Return true iff the current thread has locked the object passed in 3092 3093 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3094 JVMWrapper("JVM_HoldsLock"); 3095 assert(THREAD->is_Java_thread(), "sanity check"); 3096 if (obj == NULL) { 3097 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3098 } 3099 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3100 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3101 JVM_END 3102 3103 3104 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3105 JVMWrapper("JVM_DumpAllStacks"); 3106 VM_PrintThreads op; 3107 VMThread::execute(&op); 3108 if (JvmtiExport::should_post_data_dump()) { 3109 JvmtiExport::post_data_dump(); 3110 } 3111 JVM_END 3112 3113 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3114 JVMWrapper("JVM_SetNativeThreadName"); 3115 3116 // We don't use a ThreadsListHandle here because the current thread 3117 // must be alive. 3118 oop java_thread = JNIHandles::resolve_non_null(jthread); 3119 JavaThread* thr = java_lang_Thread::thread(java_thread); 3120 if (thread == thr && !thr->has_attached_via_jni()) { 3121 // Thread naming is only supported for the current thread and 3122 // we don't set the name of an attached thread to avoid stepping 3123 // on other programs. 3124 ResourceMark rm(thread); 3125 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3126 os::set_native_thread_name(thread_name); 3127 } 3128 JVM_END 3129 3130 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3131 3132 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3133 JVMWrapper("JVM_GetClassContext"); 3134 ResourceMark rm(THREAD); 3135 JvmtiVMObjectAllocEventCollector oam; 3136 vframeStream vfst(thread); 3137 3138 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3139 // This must only be called from SecurityManager.getClassContext 3140 Method* m = vfst.method(); 3141 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3142 m->name() == vmSymbols::getClassContext_name() && 3143 m->signature() == vmSymbols::void_class_array_signature())) { 3144 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3145 } 3146 } 3147 3148 // Collect method holders 3149 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3150 for (; !vfst.at_end(); vfst.security_next()) { 3151 Method* m = vfst.method(); 3152 // Native frames are not returned 3153 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3154 Klass* holder = m->method_holder(); 3155 assert(holder->is_klass(), "just checking"); 3156 klass_array->append(holder); 3157 } 3158 } 3159 3160 // Create result array of type [Ljava/lang/Class; 3161 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3162 // Fill in mirrors corresponding to method holders 3163 for (int i = 0; i < klass_array->length(); i++) { 3164 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3165 } 3166 3167 return (jobjectArray) JNIHandles::make_local(env, result); 3168 JVM_END 3169 3170 3171 // java.lang.Package //////////////////////////////////////////////////////////////// 3172 3173 3174 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3175 JVMWrapper("JVM_GetSystemPackage"); 3176 ResourceMark rm(THREAD); 3177 JvmtiVMObjectAllocEventCollector oam; 3178 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3179 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3180 return (jstring) JNIHandles::make_local(result); 3181 JVM_END 3182 3183 3184 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3185 JVMWrapper("JVM_GetSystemPackages"); 3186 JvmtiVMObjectAllocEventCollector oam; 3187 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3188 return (jobjectArray) JNIHandles::make_local(result); 3189 JVM_END 3190 3191 3192 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3193 3194 3195 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3196 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3197 3198 MonitorLockerEx ml(Heap_lock); 3199 oop ref = Universe::reference_pending_list(); 3200 if (ref != NULL) { 3201 Universe::set_reference_pending_list(NULL); 3202 } 3203 return JNIHandles::make_local(env, ref); 3204 JVM_END 3205 3206 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3207 JVMWrapper("JVM_HasReferencePendingList"); 3208 MonitorLockerEx ml(Heap_lock); 3209 return Universe::has_reference_pending_list(); 3210 JVM_END 3211 3212 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3213 JVMWrapper("JVM_WaitForReferencePendingList"); 3214 MonitorLockerEx ml(Heap_lock); 3215 while (!Universe::has_reference_pending_list()) { 3216 ml.wait(); 3217 } 3218 JVM_END 3219 3220 3221 // ObjectInputStream /////////////////////////////////////////////////////////////// 3222 3223 // Return the first user-defined class loader up the execution stack, or null 3224 // if only code from the bootstrap or platform class loader is on the stack. 3225 3226 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3227 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3228 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3229 oop loader = vfst.method()->method_holder()->class_loader(); 3230 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3231 return JNIHandles::make_local(env, loader); 3232 } 3233 } 3234 return NULL; 3235 JVM_END 3236 3237 3238 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3239 3240 3241 // resolve array handle and check arguments 3242 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3243 if (arr == NULL) { 3244 THROW_0(vmSymbols::java_lang_NullPointerException()); 3245 } 3246 oop a = JNIHandles::resolve_non_null(arr); 3247 if (!a->is_array()) { 3248 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3249 } else if (type_array_only && !a->is_typeArray()) { 3250 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3251 } 3252 return arrayOop(a); 3253 } 3254 3255 3256 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3257 JVMWrapper("JVM_GetArrayLength"); 3258 arrayOop a = check_array(env, arr, false, CHECK_0); 3259 return a->length(); 3260 JVM_END 3261 3262 3263 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3264 JVMWrapper("JVM_Array_Get"); 3265 JvmtiVMObjectAllocEventCollector oam; 3266 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3267 jvalue value; 3268 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3269 oop box = Reflection::box(&value, type, CHECK_NULL); 3270 return JNIHandles::make_local(env, box); 3271 JVM_END 3272 3273 3274 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3275 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3276 jvalue value; 3277 value.i = 0; // to initialize value before getting used in CHECK 3278 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3279 assert(a->is_typeArray(), "just checking"); 3280 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3281 BasicType wide_type = (BasicType) wCode; 3282 if (type != wide_type) { 3283 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3284 } 3285 return value; 3286 JVM_END 3287 3288 3289 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3290 JVMWrapper("JVM_SetArrayElement"); 3291 arrayOop a = check_array(env, arr, false, CHECK); 3292 oop box = JNIHandles::resolve(val); 3293 jvalue value; 3294 value.i = 0; // to initialize value before getting used in CHECK 3295 BasicType value_type; 3296 if (a->is_objArray()) { 3297 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3298 value_type = Reflection::unbox_for_regular_object(box, &value); 3299 } else { 3300 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3301 } 3302 Reflection::array_set(&value, a, index, value_type, CHECK); 3303 JVM_END 3304 3305 3306 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3307 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3308 arrayOop a = check_array(env, arr, true, CHECK); 3309 assert(a->is_typeArray(), "just checking"); 3310 BasicType value_type = (BasicType) vCode; 3311 Reflection::array_set(&v, a, index, value_type, CHECK); 3312 JVM_END 3313 3314 3315 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3316 JVMWrapper("JVM_NewArray"); 3317 JvmtiVMObjectAllocEventCollector oam; 3318 oop element_mirror = JNIHandles::resolve(eltClass); 3319 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3320 return JNIHandles::make_local(env, result); 3321 JVM_END 3322 3323 3324 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3325 JVMWrapper("JVM_NewMultiArray"); 3326 JvmtiVMObjectAllocEventCollector oam; 3327 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3328 oop element_mirror = JNIHandles::resolve(eltClass); 3329 assert(dim_array->is_typeArray(), "just checking"); 3330 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3331 return JNIHandles::make_local(env, result); 3332 JVM_END 3333 3334 3335 // Library support /////////////////////////////////////////////////////////////////////////// 3336 3337 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3338 //%note jvm_ct 3339 JVMWrapper("JVM_LoadLibrary"); 3340 char ebuf[1024]; 3341 void *load_result; 3342 { 3343 ThreadToNativeFromVM ttnfvm(thread); 3344 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3345 } 3346 if (load_result == NULL) { 3347 char msg[1024]; 3348 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3349 // Since 'ebuf' may contain a string encoded using 3350 // platform encoding scheme, we need to pass 3351 // Exceptions::unsafe_to_utf8 to the new_exception method 3352 // as the last argument. See bug 6367357. 3353 Handle h_exception = 3354 Exceptions::new_exception(thread, 3355 vmSymbols::java_lang_UnsatisfiedLinkError(), 3356 msg, Exceptions::unsafe_to_utf8); 3357 3358 THROW_HANDLE_0(h_exception); 3359 } 3360 return load_result; 3361 JVM_END 3362 3363 3364 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3365 JVMWrapper("JVM_UnloadLibrary"); 3366 os::dll_unload(handle); 3367 JVM_END 3368 3369 3370 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3371 JVMWrapper("JVM_FindLibraryEntry"); 3372 return os::dll_lookup(handle, name); 3373 JVM_END 3374 3375 3376 // JNI version /////////////////////////////////////////////////////////////////////////////// 3377 3378 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3379 JVMWrapper("JVM_IsSupportedJNIVersion"); 3380 return Threads::is_supported_jni_version_including_1_1(version); 3381 JVM_END 3382 3383 3384 // String support /////////////////////////////////////////////////////////////////////////// 3385 3386 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3387 JVMWrapper("JVM_InternString"); 3388 JvmtiVMObjectAllocEventCollector oam; 3389 if (str == NULL) return NULL; 3390 oop string = JNIHandles::resolve_non_null(str); 3391 oop result = StringTable::intern(string, CHECK_NULL); 3392 return (jstring) JNIHandles::make_local(env, result); 3393 JVM_END 3394 3395 3396 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3397 3398 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3399 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3400 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3401 // that only works with java threads. 3402 3403 3404 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3405 VM_Exit::block_if_vm_exited(); 3406 JVMWrapper("JVM_RawMonitorCreate"); 3407 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3408 } 3409 3410 3411 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3412 VM_Exit::block_if_vm_exited(); 3413 JVMWrapper("JVM_RawMonitorDestroy"); 3414 delete ((Mutex*) mon); 3415 } 3416 3417 3418 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3419 VM_Exit::block_if_vm_exited(); 3420 JVMWrapper("JVM_RawMonitorEnter"); 3421 ((Mutex*) mon)->jvm_raw_lock(); 3422 return 0; 3423 } 3424 3425 3426 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3427 VM_Exit::block_if_vm_exited(); 3428 JVMWrapper("JVM_RawMonitorExit"); 3429 ((Mutex*) mon)->jvm_raw_unlock(); 3430 } 3431 3432 3433 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3434 3435 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3436 Handle loader, Handle protection_domain, 3437 jboolean throwError, TRAPS) { 3438 // Security Note: 3439 // The Java level wrapper will perform the necessary security check allowing 3440 // us to pass the NULL as the initiating class loader. The VM is responsible for 3441 // the checkPackageAccess relative to the initiating class loader via the 3442 // protection_domain. The protection_domain is passed as NULL by the java code 3443 // if there is no security manager in 3-arg Class.forName(). 3444 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3445 3446 // Check if we should initialize the class 3447 if (init && klass->is_instance_klass()) { 3448 klass->initialize(CHECK_NULL); 3449 } 3450 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3451 } 3452 3453 3454 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3455 3456 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3457 JVMWrapper("JVM_InvokeMethod"); 3458 Handle method_handle; 3459 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3460 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3461 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3462 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3463 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3464 jobject res = JNIHandles::make_local(env, result); 3465 if (JvmtiExport::should_post_vm_object_alloc()) { 3466 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3467 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3468 if (java_lang_Class::is_primitive(ret_type)) { 3469 // Only for primitive type vm allocates memory for java object. 3470 // See box() method. 3471 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3472 } 3473 } 3474 return res; 3475 } else { 3476 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3477 } 3478 JVM_END 3479 3480 3481 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3482 JVMWrapper("JVM_NewInstanceFromConstructor"); 3483 oop constructor_mirror = JNIHandles::resolve(c); 3484 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3485 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3486 jobject res = JNIHandles::make_local(env, result); 3487 if (JvmtiExport::should_post_vm_object_alloc()) { 3488 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3489 } 3490 return res; 3491 JVM_END 3492 3493 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3494 3495 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3496 JVMWrapper("JVM_SupportsCX8"); 3497 return VM_Version::supports_cx8(); 3498 JVM_END 3499 3500 // Returns an array of all live Thread objects (VM internal JavaThreads, 3501 // jvmti agent threads, and JNI attaching threads are skipped) 3502 // See CR 6404306 regarding JNI attaching threads 3503 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3504 ResourceMark rm(THREAD); 3505 ThreadsListEnumerator tle(THREAD, false, false); 3506 JvmtiVMObjectAllocEventCollector oam; 3507 3508 int num_threads = tle.num_threads(); 3509 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3510 objArrayHandle threads_ah(THREAD, r); 3511 3512 for (int i = 0; i < num_threads; i++) { 3513 Handle h = tle.get_threadObj(i); 3514 threads_ah->obj_at_put(i, h()); 3515 } 3516 3517 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3518 JVM_END 3519 3520 3521 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3522 // Return StackTraceElement[][], each element is the stack trace of a thread in 3523 // the corresponding entry in the given threads array 3524 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3525 JVMWrapper("JVM_DumpThreads"); 3526 JvmtiVMObjectAllocEventCollector oam; 3527 3528 // Check if threads is null 3529 if (threads == NULL) { 3530 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3531 } 3532 3533 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3534 objArrayHandle ah(THREAD, a); 3535 int num_threads = ah->length(); 3536 // check if threads is non-empty array 3537 if (num_threads == 0) { 3538 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3539 } 3540 3541 // check if threads is not an array of objects of Thread class 3542 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3543 if (k != SystemDictionary::Thread_klass()) { 3544 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3545 } 3546 3547 ResourceMark rm(THREAD); 3548 3549 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3550 for (int i = 0; i < num_threads; i++) { 3551 oop thread_obj = ah->obj_at(i); 3552 instanceHandle h(THREAD, (instanceOop) thread_obj); 3553 thread_handle_array->append(h); 3554 } 3555 3556 // The JavaThread references in thread_handle_array are validated 3557 // in VM_ThreadDump::doit(). 3558 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3559 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3560 3561 JVM_END 3562 3563 // JVM monitoring and management support 3564 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3565 return Management::get_jmm_interface(version); 3566 JVM_END 3567 3568 // com.sun.tools.attach.VirtualMachine agent properties support 3569 // 3570 // Initialize the agent properties with the properties maintained in the VM 3571 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3572 JVMWrapper("JVM_InitAgentProperties"); 3573 ResourceMark rm; 3574 3575 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3576 3577 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3578 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3579 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3580 return properties; 3581 JVM_END 3582 3583 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3584 { 3585 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3586 JvmtiVMObjectAllocEventCollector oam; 3587 3588 if (ofClass == NULL) { 3589 return NULL; 3590 } 3591 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3592 // Special handling for primitive objects 3593 if (java_lang_Class::is_primitive(mirror())) { 3594 return NULL; 3595 } 3596 Klass* k = java_lang_Class::as_Klass(mirror()); 3597 if (!k->is_instance_klass()) { 3598 return NULL; 3599 } 3600 InstanceKlass* ik = InstanceKlass::cast(k); 3601 int encl_method_class_idx = ik->enclosing_method_class_index(); 3602 if (encl_method_class_idx == 0) { 3603 return NULL; 3604 } 3605 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3606 objArrayHandle dest(THREAD, dest_o); 3607 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3608 dest->obj_at_put(0, enc_k->java_mirror()); 3609 int encl_method_method_idx = ik->enclosing_method_method_index(); 3610 if (encl_method_method_idx != 0) { 3611 Symbol* sym = ik->constants()->symbol_at( 3612 extract_low_short_from_int( 3613 ik->constants()->name_and_type_at(encl_method_method_idx))); 3614 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3615 dest->obj_at_put(1, str()); 3616 sym = ik->constants()->symbol_at( 3617 extract_high_short_from_int( 3618 ik->constants()->name_and_type_at(encl_method_method_idx))); 3619 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3620 dest->obj_at_put(2, str()); 3621 } 3622 return (jobjectArray) JNIHandles::make_local(dest()); 3623 } 3624 JVM_END 3625 3626 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3627 { 3628 memset(info, 0, info_size); 3629 3630 info->jvm_version = Abstract_VM_Version::jvm_version(); 3631 info->patch_version = Abstract_VM_Version::vm_patch_version(); 3632 3633 // when we add a new capability in the jvm_version_info struct, we should also 3634 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3635 // counter defined in runtimeService.cpp. 3636 info->is_attach_supported = AttachListener::is_attach_supported(); 3637 } 3638 JVM_END 3639 3640 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3641 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3642 ResourceMark rm(THREAD); 3643 3644 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3645 return NULL; 3646 } 3647 3648 char** vm_flags = Arguments::jvm_flags_array(); 3649 char** vm_args = Arguments::jvm_args_array(); 3650 int num_flags = Arguments::num_jvm_flags(); 3651 int num_args = Arguments::num_jvm_args(); 3652 3653 InstanceKlass* ik = SystemDictionary::String_klass(); 3654 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3655 objArrayHandle result_h(THREAD, r); 3656 3657 int index = 0; 3658 for (int j = 0; j < num_flags; j++, index++) { 3659 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3660 result_h->obj_at_put(index, h()); 3661 } 3662 for (int i = 0; i < num_args; i++, index++) { 3663 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3664 result_h->obj_at_put(index, h()); 3665 } 3666 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3667 JVM_END 3668 3669 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3670 return os::get_signal_number(name); 3671 JVM_END