1 /* 2 * Copyright (c) 1997, 2020, 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/symbolTable.hpp" 37 #include "classfile/systemDictionary.hpp" 38 #include "classfile/vmSymbols.hpp" 39 #include "gc/shared/collectedHeap.inline.hpp" 40 #include "interpreter/bytecode.hpp" 41 #include "interpreter/bytecodeUtils.hpp" 42 #include "jfr/jfrEvents.hpp" 43 #include "logging/log.hpp" 44 #include "memory/heapShared.hpp" 45 #include "memory/oopFactory.hpp" 46 #include "memory/referenceType.hpp" 47 #include "memory/resourceArea.hpp" 48 #include "memory/universe.hpp" 49 #include "oops/access.inline.hpp" 50 #include "oops/constantPool.hpp" 51 #include "oops/fieldStreams.inline.hpp" 52 #include "oops/instanceKlass.hpp" 53 #include "oops/method.hpp" 54 #include "oops/recordComponent.hpp" 55 #include "oops/objArrayKlass.hpp" 56 #include "oops/objArrayOop.inline.hpp" 57 #include "oops/oop.inline.hpp" 58 #include "prims/jvm_misc.hpp" 59 #include "prims/jvmtiExport.hpp" 60 #include "prims/jvmtiThreadState.hpp" 61 #include "prims/nativeLookup.hpp" 62 #include "prims/stackwalk.hpp" 63 #include "runtime/arguments.hpp" 64 #include "runtime/atomic.hpp" 65 #include "runtime/handles.inline.hpp" 66 #include "runtime/init.hpp" 67 #include "runtime/interfaceSupport.inline.hpp" 68 #include "runtime/deoptimization.hpp" 69 #include "runtime/handshake.hpp" 70 #include "runtime/java.hpp" 71 #include "runtime/javaCalls.hpp" 72 #include "runtime/jfieldIDWorkaround.hpp" 73 #include "runtime/jniHandles.inline.hpp" 74 #include "runtime/os.inline.hpp" 75 #include "runtime/perfData.hpp" 76 #include "runtime/reflection.hpp" 77 #include "runtime/thread.inline.hpp" 78 #include "runtime/threadSMR.hpp" 79 #include "runtime/vframe.inline.hpp" 80 #include "runtime/vmOperations.hpp" 81 #include "runtime/vm_version.hpp" 82 #include "services/attachListener.hpp" 83 #include "services/management.hpp" 84 #include "services/threadService.hpp" 85 #include "utilities/copy.hpp" 86 #include "utilities/defaultStream.hpp" 87 #include "utilities/dtrace.hpp" 88 #include "utilities/events.hpp" 89 #include "utilities/histogram.hpp" 90 #include "utilities/macros.hpp" 91 #include "utilities/utf8.hpp" 92 #if INCLUDE_CDS 93 #include "classfile/systemDictionaryShared.hpp" 94 #endif 95 96 #include <errno.h> 97 98 /* 99 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 100 such ctors and calls MUST NOT come between an oop declaration/init and its 101 usage because if objects are move this may cause various memory stomps, bus 102 errors and segfaults. Here is a cookbook for causing so called "naked oop 103 failures": 104 105 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 106 JVMWrapper("JVM_GetClassDeclaredFields"); 107 108 // Object address to be held directly in mirror & not visible to GC 109 oop mirror = JNIHandles::resolve_non_null(ofClass); 110 111 // If this ctor can hit a safepoint, moving objects around, then 112 ComplexConstructor foo; 113 114 // Boom! mirror may point to JUNK instead of the intended object 115 (some dereference of mirror) 116 117 // Here's another call that may block for GC, making mirror stale 118 MutexLocker ml(some_lock); 119 120 // And here's an initializer that can result in a stale oop 121 // all in one step. 122 oop o = call_that_can_throw_exception(TRAPS); 123 124 125 The solution is to keep the oop declaration BELOW the ctor or function 126 call that might cause a GC, do another resolve to reassign the oop, or 127 consider use of a Handle instead of an oop so there is immunity from object 128 motion. But note that the "QUICK" entries below do not have a handlemark 129 and thus can only support use of handles passed in. 130 */ 131 132 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 133 ResourceMark rm; 134 int line_number = -1; 135 const char * source_file = NULL; 136 const char * trace = "explicit"; 137 InstanceKlass* caller = NULL; 138 JavaThread* jthread = JavaThread::current(); 139 if (jthread->has_last_Java_frame()) { 140 vframeStream vfst(jthread); 141 142 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 143 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController"); 144 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 145 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction"); 146 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 147 148 Method* last_caller = NULL; 149 150 while (!vfst.at_end()) { 151 Method* m = vfst.method(); 152 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 153 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 154 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 155 break; 156 } 157 last_caller = m; 158 vfst.next(); 159 } 160 // if this is called from Class.forName0 and that is called from Class.forName, 161 // then print the caller of Class.forName. If this is Class.loadClass, then print 162 // that caller, otherwise keep quiet since this should be picked up elsewhere. 163 bool found_it = false; 164 if (!vfst.at_end() && 165 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 166 vfst.method()->name() == vmSymbols::forName0_name()) { 167 vfst.next(); 168 if (!vfst.at_end() && 169 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 170 vfst.method()->name() == vmSymbols::forName_name()) { 171 vfst.next(); 172 found_it = true; 173 } 174 } else if (last_caller != NULL && 175 last_caller->method_holder()->name() == 176 vmSymbols::java_lang_ClassLoader() && 177 last_caller->name() == vmSymbols::loadClass_name()) { 178 found_it = true; 179 } else if (!vfst.at_end()) { 180 if (vfst.method()->is_native()) { 181 // JNI call 182 found_it = true; 183 } 184 } 185 if (found_it && !vfst.at_end()) { 186 // found the caller 187 caller = vfst.method()->method_holder(); 188 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 189 if (line_number == -1) { 190 // show method name if it's a native method 191 trace = vfst.method()->name_and_sig_as_C_string(); 192 } 193 Symbol* s = caller->source_file_name(); 194 if (s != NULL) { 195 source_file = s->as_C_string(); 196 } 197 } 198 } 199 if (caller != NULL) { 200 if (to_class != caller) { 201 const char * from = caller->external_name(); 202 const char * to = to_class->external_name(); 203 // print in a single call to reduce interleaving between threads 204 if (source_file != NULL) { 205 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 206 } else { 207 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 208 } 209 } 210 } 211 } 212 213 void trace_class_resolution(Klass* to_class) { 214 EXCEPTION_MARK; 215 trace_class_resolution_impl(to_class, THREAD); 216 if (HAS_PENDING_EXCEPTION) { 217 CLEAR_PENDING_EXCEPTION; 218 } 219 } 220 221 // Wrapper to trace JVM functions 222 223 #ifdef ASSERT 224 Histogram* JVMHistogram; 225 volatile int JVMHistogram_lock = 0; 226 227 class JVMHistogramElement : public HistogramElement { 228 public: 229 JVMHistogramElement(const char* name); 230 }; 231 232 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 233 _name = elementName; 234 uintx count = 0; 235 236 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) { 237 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) { 238 count +=1; 239 if ( (WarnOnStalledSpinLock > 0) 240 && (count % WarnOnStalledSpinLock == 0)) { 241 warning("JVMHistogram_lock seems to be stalled"); 242 } 243 } 244 } 245 246 if(JVMHistogram == NULL) 247 JVMHistogram = new Histogram("JVM Call Counts",100); 248 249 JVMHistogram->add_element(this); 250 Atomic::dec(&JVMHistogram_lock); 251 } 252 253 #define JVMCountWrapper(arg) \ 254 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 255 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 256 257 #define JVMWrapper(arg) JVMCountWrapper(arg); 258 #else 259 #define JVMWrapper(arg) 260 #endif 261 262 263 // Interface version ///////////////////////////////////////////////////////////////////// 264 265 266 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 267 return JVM_INTERFACE_VERSION; 268 JVM_END 269 270 271 // java.lang.System ////////////////////////////////////////////////////////////////////// 272 273 274 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 275 JVMWrapper("JVM_CurrentTimeMillis"); 276 return os::javaTimeMillis(); 277 JVM_END 278 279 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 280 JVMWrapper("JVM_NanoTime"); 281 return os::javaTimeNanos(); 282 JVM_END 283 284 // The function below is actually exposed by jdk.internal.misc.VM and not 285 // java.lang.System, but we choose to keep it here so that it stays next 286 // to JVM_CurrentTimeMillis and JVM_NanoTime 287 288 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 289 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 290 291 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 292 JVMWrapper("JVM_GetNanoTimeAdjustment"); 293 jlong seconds; 294 jlong nanos; 295 296 os::javaTimeSystemUTC(seconds, nanos); 297 298 // We're going to verify that the result can fit in a long. 299 // For that we need the difference in seconds between 'seconds' 300 // and 'offset_secs' to be such that: 301 // |seconds - offset_secs| < (2^63/10^9) 302 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 303 // which makes |seconds - offset_secs| < 2^33 304 // and we will prefer +/- 2^32 as the maximum acceptable diff 305 // as 2^32 has a more natural feel than 2^33... 306 // 307 // So if |seconds - offset_secs| >= 2^32 - we return a special 308 // sentinel value (-1) which the caller should take as an 309 // exception value indicating that the offset given to us is 310 // too far from range of the current time - leading to too big 311 // a nano adjustment. The caller is expected to recover by 312 // computing a more accurate offset and calling this method 313 // again. (For the record 2^32 secs is ~136 years, so that 314 // should rarely happen) 315 // 316 jlong diff = seconds - offset_secs; 317 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 318 return -1; // sentinel value: the offset is too far off the target 319 } 320 321 // return the adjustment. If you compute a time by adding 322 // this number of nanoseconds along with the number of seconds 323 // in the offset you should get the current UTC time. 324 return (diff * (jlong)1000000000) + nanos; 325 JVM_END 326 327 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 328 jobject dst, jint dst_pos, jint length)) 329 JVMWrapper("JVM_ArrayCopy"); 330 // Check if we have null pointers 331 if (src == NULL || dst == NULL) { 332 THROW(vmSymbols::java_lang_NullPointerException()); 333 } 334 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 335 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 336 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 337 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 338 // Do copy 339 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 340 JVM_END 341 342 343 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 344 JavaValue r(T_OBJECT); 345 // public synchronized Object put(Object key, Object value); 346 HandleMark hm(THREAD); 347 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 348 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 349 JavaCalls::call_virtual(&r, 350 props, 351 SystemDictionary::Properties_klass(), 352 vmSymbols::put_name(), 353 vmSymbols::object_object_object_signature(), 354 key_str, 355 value_str, 356 THREAD); 357 } 358 359 360 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 361 362 /* 363 * Return all of the system properties in a Java String array with alternating 364 * names and values from the jvm SystemProperty. 365 * Which includes some internal and all commandline -D defined properties. 366 */ 367 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 368 JVMWrapper("JVM_GetProperties"); 369 ResourceMark rm(THREAD); 370 HandleMark hm(THREAD); 371 int ndx = 0; 372 int fixedCount = 2; 373 374 SystemProperty* p = Arguments::system_properties(); 375 int count = Arguments::PropertyList_count(p); 376 377 // Allocate result String array 378 InstanceKlass* ik = SystemDictionary::String_klass(); 379 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 380 objArrayHandle result_h(THREAD, r); 381 382 while (p != NULL) { 383 const char * key = p->key(); 384 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 385 const char * value = p->value(); 386 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 387 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL); 388 result_h->obj_at_put(ndx * 2, key_str()); 389 result_h->obj_at_put(ndx * 2 + 1, value_str()); 390 ndx++; 391 } 392 p = p->next(); 393 } 394 395 // Convert the -XX:MaxDirectMemorySize= command line flag 396 // to the sun.nio.MaxDirectMemorySize property. 397 // Do this after setting user properties to prevent people 398 // from setting the value with a -D option, as requested. 399 // Leave empty if not supplied 400 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 401 char as_chars[256]; 402 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 403 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 404 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 405 result_h->obj_at_put(ndx * 2, key_str()); 406 result_h->obj_at_put(ndx * 2 + 1, value_str()); 407 ndx++; 408 } 409 410 // JVM monitoring and management support 411 // Add the sun.management.compiler property for the compiler's name 412 { 413 #undef CSIZE 414 #if defined(_LP64) || defined(_WIN64) 415 #define CSIZE "64-Bit " 416 #else 417 #define CSIZE 418 #endif // 64bit 419 420 #ifdef TIERED 421 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 422 #else 423 #if defined(COMPILER1) 424 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 425 #elif defined(COMPILER2) 426 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 427 #elif INCLUDE_JVMCI 428 #error "INCLUDE_JVMCI should imply TIERED" 429 #else 430 const char* compiler_name = ""; 431 #endif // compilers 432 #endif // TIERED 433 434 if (*compiler_name != '\0' && 435 (Arguments::mode() != Arguments::_int)) { 436 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 437 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 438 result_h->obj_at_put(ndx * 2, key_str()); 439 result_h->obj_at_put(ndx * 2 + 1, value_str()); 440 ndx++; 441 } 442 } 443 444 return (jobjectArray) JNIHandles::make_local(env, result_h()); 445 JVM_END 446 447 448 /* 449 * Return the temporary directory that the VM uses for the attach 450 * and perf data files. 451 * 452 * It is important that this directory is well-known and the 453 * same for all VM instances. It cannot be affected by configuration 454 * variables such as java.io.tmpdir. 455 */ 456 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 457 JVMWrapper("JVM_GetTemporaryDirectory"); 458 HandleMark hm(THREAD); 459 const char* temp_dir = os::get_temp_directory(); 460 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 461 return (jstring) JNIHandles::make_local(env, h()); 462 JVM_END 463 464 465 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 466 467 extern volatile jint vm_created; 468 469 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 470 JVMWrapper("JVM_BeforeHalt"); 471 EventShutdown event; 472 if (event.should_commit()) { 473 event.set_reason("Shutdown requested from Java"); 474 event.commit(); 475 } 476 JVM_END 477 478 479 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 480 before_exit(thread); 481 vm_exit(code); 482 JVM_END 483 484 485 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 486 JVMWrapper("JVM_GC"); 487 if (!DisableExplicitGC) { 488 Universe::heap()->collect(GCCause::_java_lang_system_gc); 489 } 490 JVM_END 491 492 493 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 494 JVMWrapper("JVM_MaxObjectInspectionAge"); 495 return Universe::heap()->millis_since_last_gc(); 496 JVM_END 497 498 499 static inline jlong convert_size_t_to_jlong(size_t val) { 500 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 501 NOT_LP64 (return (jlong)val;) 502 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 503 } 504 505 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 506 JVMWrapper("JVM_TotalMemory"); 507 size_t n = Universe::heap()->capacity(); 508 return convert_size_t_to_jlong(n); 509 JVM_END 510 511 512 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 513 JVMWrapper("JVM_FreeMemory"); 514 size_t n = Universe::heap()->unused(); 515 return convert_size_t_to_jlong(n); 516 JVM_END 517 518 519 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 520 JVMWrapper("JVM_MaxMemory"); 521 size_t n = Universe::heap()->max_capacity(); 522 return convert_size_t_to_jlong(n); 523 JVM_END 524 525 526 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 527 JVMWrapper("JVM_ActiveProcessorCount"); 528 return os::active_processor_count(); 529 JVM_END 530 531 532 533 // java.lang.Throwable ////////////////////////////////////////////////////// 534 535 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 536 JVMWrapper("JVM_FillInStackTrace"); 537 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 538 java_lang_Throwable::fill_in_stack_trace(exception); 539 JVM_END 540 541 // java.lang.NullPointerException /////////////////////////////////////////// 542 543 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 544 if (!ShowCodeDetailsInExceptionMessages) return NULL; 545 546 oop exc = JNIHandles::resolve_non_null(throwable); 547 548 Method* method; 549 int bci; 550 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 551 return NULL; 552 } 553 if (method->is_native()) { 554 return NULL; 555 } 556 557 stringStream ss; 558 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 559 if (ok) { 560 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_0); 561 return (jstring) JNIHandles::make_local(env, result); 562 } else { 563 return NULL; 564 } 565 JVM_END 566 567 // java.lang.StackTraceElement ////////////////////////////////////////////// 568 569 570 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 571 JVMWrapper("JVM_InitStackTraceElementArray"); 572 Handle exception(THREAD, JNIHandles::resolve(throwable)); 573 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 574 objArrayHandle stack_trace(THREAD, st); 575 // Fill in the allocated stack trace 576 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 577 JVM_END 578 579 580 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 581 JVMWrapper("JVM_InitStackTraceElement"); 582 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 583 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 584 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 585 JVM_END 586 587 588 // java.lang.StackWalker ////////////////////////////////////////////////////// 589 590 591 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 592 jint skip_frames, jint frame_count, jint start_index, 593 jobjectArray frames)) 594 JVMWrapper("JVM_CallStackWalk"); 595 JavaThread* jt = (JavaThread*) THREAD; 596 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 597 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 598 } 599 600 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 601 602 // frames array is a Class<?>[] array when only getting caller reference, 603 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 604 // be null. 605 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 606 objArrayHandle frames_array_h(THREAD, fa); 607 608 int limit = start_index + frame_count; 609 if (frames_array_h->length() < limit) { 610 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 611 } 612 613 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 614 start_index, frames_array_h, CHECK_NULL); 615 return JNIHandles::make_local(env, result); 616 JVM_END 617 618 619 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 620 jint frame_count, jint start_index, 621 jobjectArray frames)) 622 JVMWrapper("JVM_MoreStackWalk"); 623 JavaThread* jt = (JavaThread*) THREAD; 624 625 // frames array is a Class<?>[] array when only getting caller reference, 626 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 627 // be null. 628 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 629 objArrayHandle frames_array_h(THREAD, fa); 630 631 int limit = start_index+frame_count; 632 if (frames_array_h->length() < limit) { 633 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 634 } 635 636 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 637 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 638 start_index, frames_array_h, THREAD); 639 JVM_END 640 641 // java.lang.Object /////////////////////////////////////////////// 642 643 644 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 645 JVMWrapper("JVM_IHashCode"); 646 // as implemented in the classic virtual machine; return 0 if object is NULL 647 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 648 JVM_END 649 650 651 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 652 JVMWrapper("JVM_MonitorWait"); 653 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 654 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 655 if (JvmtiExport::should_post_monitor_wait()) { 656 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 657 658 // The current thread already owns the monitor and it has not yet 659 // been added to the wait queue so the current thread cannot be 660 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 661 // event handler cannot accidentally consume an unpark() meant for 662 // the ParkEvent associated with this ObjectMonitor. 663 } 664 ObjectSynchronizer::wait(obj, ms, CHECK); 665 JVM_END 666 667 668 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 669 JVMWrapper("JVM_MonitorNotify"); 670 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 671 ObjectSynchronizer::notify(obj, CHECK); 672 JVM_END 673 674 675 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 676 JVMWrapper("JVM_MonitorNotifyAll"); 677 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 678 ObjectSynchronizer::notifyall(obj, CHECK); 679 JVM_END 680 681 682 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 683 JVMWrapper("JVM_Clone"); 684 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 685 Klass* klass = obj->klass(); 686 JvmtiVMObjectAllocEventCollector oam; 687 688 #ifdef ASSERT 689 // Just checking that the cloneable flag is set correct 690 if (obj->is_array()) { 691 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 692 } else { 693 guarantee(obj->is_instance(), "should be instanceOop"); 694 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 695 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 696 } 697 #endif 698 699 // Check if class of obj supports the Cloneable interface. 700 // All arrays are considered to be cloneable (See JLS 20.1.5). 701 // All j.l.r.Reference classes are considered non-cloneable. 702 if (!klass->is_cloneable() || 703 (klass->is_instance_klass() && 704 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 705 ResourceMark rm(THREAD); 706 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 707 } 708 709 // Make shallow object copy 710 const int size = obj->size(); 711 oop new_obj_oop = NULL; 712 if (obj->is_array()) { 713 const int length = ((arrayOop)obj())->length(); 714 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 715 /* do_zero */ true, CHECK_NULL); 716 } else { 717 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 718 } 719 720 HeapAccess<>::clone(obj(), new_obj_oop, size); 721 722 Handle new_obj(THREAD, new_obj_oop); 723 // Caution: this involves a java upcall, so the clone should be 724 // "gc-robust" by this stage. 725 if (klass->has_finalizer()) { 726 assert(obj->is_instance(), "should be instanceOop"); 727 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 728 new_obj = Handle(THREAD, new_obj_oop); 729 } 730 731 return JNIHandles::make_local(env, new_obj()); 732 JVM_END 733 734 // java.io.File /////////////////////////////////////////////////////////////// 735 736 JVM_LEAF(char*, JVM_NativePath(char* path)) 737 JVMWrapper("JVM_NativePath"); 738 return os::native_path(path); 739 JVM_END 740 741 742 // Misc. class handling /////////////////////////////////////////////////////////// 743 744 745 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 746 JVMWrapper("JVM_GetCallerClass"); 747 748 // Getting the class of the caller frame. 749 // 750 // The call stack at this point looks something like this: 751 // 752 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 753 // [1] [ @CallerSensitive API.method ] 754 // [.] [ (skipped intermediate frames) ] 755 // [n] [ caller ] 756 vframeStream vfst(thread); 757 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 758 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 759 Method* m = vfst.method(); 760 assert(m != NULL, "sanity"); 761 switch (n) { 762 case 0: 763 // This must only be called from Reflection.getCallerClass 764 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 765 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 766 } 767 // fall-through 768 case 1: 769 // Frame 0 and 1 must be caller sensitive. 770 if (!m->caller_sensitive()) { 771 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 772 } 773 break; 774 default: 775 if (!m->is_ignored_by_security_stack_walk()) { 776 // We have reached the desired frame; return the holder class. 777 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 778 } 779 break; 780 } 781 } 782 return NULL; 783 JVM_END 784 785 786 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 787 JVMWrapper("JVM_FindPrimitiveClass"); 788 oop mirror = NULL; 789 BasicType t = name2type(utf); 790 if (t != T_ILLEGAL && !is_reference_type(t)) { 791 mirror = Universe::java_mirror(t); 792 } 793 if (mirror == NULL) { 794 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 795 } else { 796 return (jclass) JNIHandles::make_local(env, mirror); 797 } 798 JVM_END 799 800 801 // Returns a class loaded by the bootstrap class loader; or null 802 // if not found. ClassNotFoundException is not thrown. 803 // FindClassFromBootLoader is exported to the launcher for windows. 804 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 805 const char* name)) 806 JVMWrapper("JVM_FindClassFromBootLoader"); 807 808 // Java libraries should ensure that name is never null... 809 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 810 // It's impossible to create this class; the name cannot fit 811 // into the constant pool. 812 return NULL; 813 } 814 815 TempNewSymbol h_name = SymbolTable::new_symbol(name); 816 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 817 if (k == NULL) { 818 return NULL; 819 } 820 821 if (log_is_enabled(Debug, class, resolve)) { 822 trace_class_resolution(k); 823 } 824 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 825 JVM_END 826 827 // Find a class with this name in this loader, using the caller's protection domain. 828 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 829 jboolean init, jobject loader, 830 jclass caller)) 831 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 832 // Java libraries should ensure that name is never null... 833 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 834 // It's impossible to create this class; the name cannot fit 835 // into the constant pool. 836 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 837 } 838 839 TempNewSymbol h_name = SymbolTable::new_symbol(name); 840 841 oop loader_oop = JNIHandles::resolve(loader); 842 oop from_class = JNIHandles::resolve(caller); 843 oop protection_domain = NULL; 844 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 845 // NPE. Put it in another way, the bootstrap class loader has all permission and 846 // thus no checkPackageAccess equivalence in the VM class loader. 847 // The caller is also passed as NULL by the java code if there is no security 848 // manager to avoid the performance cost of getting the calling class. 849 if (from_class != NULL && loader_oop != NULL) { 850 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 851 } 852 853 Handle h_loader(THREAD, loader_oop); 854 Handle h_prot(THREAD, protection_domain); 855 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 856 h_prot, false, THREAD); 857 858 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 859 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 860 } 861 return result; 862 JVM_END 863 864 // Currently only called from the old verifier. 865 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 866 jboolean init, jclass from)) 867 JVMWrapper("JVM_FindClassFromClass"); 868 if (name == NULL) { 869 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 870 } 871 if ((int)strlen(name) > Symbol::max_length()) { 872 // It's impossible to create this class; the name cannot fit 873 // into the constant pool. 874 Exceptions::fthrow(THREAD_AND_LOCATION, 875 vmSymbols::java_lang_NoClassDefFoundError(), 876 "Class name exceeds maximum length of %d: %s", 877 Symbol::max_length(), 878 name); 879 return 0; 880 } 881 TempNewSymbol h_name = SymbolTable::new_symbol(name); 882 oop from_class_oop = JNIHandles::resolve(from); 883 Klass* from_class = (from_class_oop == NULL) 884 ? (Klass*)NULL 885 : java_lang_Class::as_Klass(from_class_oop); 886 oop class_loader = NULL; 887 oop protection_domain = NULL; 888 if (from_class != NULL) { 889 class_loader = from_class->class_loader(); 890 protection_domain = from_class->protection_domain(); 891 } 892 Handle h_loader(THREAD, class_loader); 893 Handle h_prot (THREAD, protection_domain); 894 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 895 h_prot, true, thread); 896 897 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 898 // this function is generally only used for class loading during verification. 899 ResourceMark rm; 900 oop from_mirror = JNIHandles::resolve_non_null(from); 901 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 902 const char * from_name = from_class->external_name(); 903 904 oop mirror = JNIHandles::resolve_non_null(result); 905 Klass* to_class = java_lang_Class::as_Klass(mirror); 906 const char * to = to_class->external_name(); 907 log_debug(class, resolve)("%s %s (verification)", from_name, to); 908 } 909 910 return result; 911 JVM_END 912 913 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 914 if (loader.is_null()) { 915 return; 916 } 917 918 // check whether the current caller thread holds the lock or not. 919 // If not, increment the corresponding counter 920 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 921 ObjectSynchronizer::owner_self) { 922 counter->inc(); 923 } 924 } 925 926 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 927 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 928 jobject loader, const jbyte *buf, 929 jsize len, jobject pd, const char *source, 930 TRAPS) { 931 if (source == NULL) source = "__JVM_DefineClass__"; 932 933 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 934 JavaThread* jt = (JavaThread*) THREAD; 935 936 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 937 ClassLoader::perf_define_appclass_selftime(), 938 ClassLoader::perf_define_appclasses(), 939 jt->get_thread_stat()->perf_recursion_counts_addr(), 940 jt->get_thread_stat()->perf_timers_addr(), 941 PerfClassTraceTime::DEFINE_CLASS); 942 943 if (UsePerfData) { 944 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 945 } 946 947 // Since exceptions can be thrown, class initialization can take place 948 // if name is NULL no check for class name in .class stream has to be made. 949 TempNewSymbol class_name = NULL; 950 if (name != NULL) { 951 const int str_len = (int)strlen(name); 952 if (str_len > Symbol::max_length()) { 953 // It's impossible to create this class; the name cannot fit 954 // into the constant pool. 955 Exceptions::fthrow(THREAD_AND_LOCATION, 956 vmSymbols::java_lang_NoClassDefFoundError(), 957 "Class name exceeds maximum length of %d: %s", 958 Symbol::max_length(), 959 name); 960 return 0; 961 } 962 class_name = SymbolTable::new_symbol(name, str_len); 963 } 964 965 ResourceMark rm(THREAD); 966 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 967 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 968 if (UsePerfData) { 969 is_lock_held_by_thread(class_loader, 970 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 971 THREAD); 972 } 973 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 974 Klass* k = SystemDictionary::resolve_from_stream(class_name, 975 class_loader, 976 protection_domain, 977 &st, 978 CHECK_NULL); 979 980 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 981 trace_class_resolution(k); 982 } 983 984 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 985 } 986 987 988 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 989 JVMWrapper("JVM_DefineClass"); 990 991 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 992 JVM_END 993 994 995 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 996 JVMWrapper("JVM_DefineClassWithSource"); 997 998 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 999 JVM_END 1000 1001 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1002 JVMWrapper("JVM_FindLoadedClass"); 1003 ResourceMark rm(THREAD); 1004 1005 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1006 char* str = java_lang_String::as_utf8_string(h_name()); 1007 1008 // Sanity check, don't expect null 1009 if (str == NULL) return NULL; 1010 1011 // Internalize the string, converting '.' to '/' in string. 1012 char* p = (char*)str; 1013 while (*p != '\0') { 1014 if (*p == '.') { 1015 *p = '/'; 1016 } 1017 p++; 1018 } 1019 1020 const int str_len = (int)(p - str); 1021 if (str_len > Symbol::max_length()) { 1022 // It's impossible to create this class; the name cannot fit 1023 // into the constant pool. 1024 return NULL; 1025 } 1026 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1027 1028 // Security Note: 1029 // The Java level wrapper will perform the necessary security check allowing 1030 // us to pass the NULL as the initiating class loader. 1031 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1032 if (UsePerfData) { 1033 is_lock_held_by_thread(h_loader, 1034 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1035 THREAD); 1036 } 1037 1038 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1039 h_loader, 1040 Handle(), 1041 CHECK_NULL); 1042 #if INCLUDE_CDS 1043 if (k == NULL) { 1044 // If the class is not already loaded, try to see if it's in the shared 1045 // archive for the current classloader (h_loader). 1046 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1047 } 1048 #endif 1049 return (k == NULL) ? NULL : 1050 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1051 JVM_END 1052 1053 // Module support ////////////////////////////////////////////////////////////////////////////// 1054 1055 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1056 jstring location, const char* const* packages, jsize num_packages)) 1057 JVMWrapper("JVM_DefineModule"); 1058 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1059 JVM_END 1060 1061 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1062 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1063 Modules::set_bootloader_unnamed_module(module, CHECK); 1064 JVM_END 1065 1066 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1067 JVMWrapper("JVM_AddModuleExports"); 1068 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1069 JVM_END 1070 1071 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1072 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1073 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1074 JVM_END 1075 1076 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1077 JVMWrapper("JVM_AddModuleExportsToAll"); 1078 Modules::add_module_exports(from_module, package, NULL, CHECK); 1079 JVM_END 1080 1081 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1082 JVMWrapper("JVM_AddReadsModule"); 1083 Modules::add_reads_module(from_module, source_module, CHECK); 1084 JVM_END 1085 1086 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1087 1088 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1089 assert (cls != NULL, "illegal class"); 1090 JVMWrapper("JVM_InitClassName"); 1091 JvmtiVMObjectAllocEventCollector oam; 1092 ResourceMark rm(THREAD); 1093 HandleMark hm(THREAD); 1094 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1095 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1096 return (jstring) JNIHandles::make_local(env, result); 1097 JVM_END 1098 1099 1100 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1101 JVMWrapper("JVM_GetClassInterfaces"); 1102 JvmtiVMObjectAllocEventCollector oam; 1103 oop mirror = JNIHandles::resolve_non_null(cls); 1104 1105 // Special handling for primitive objects 1106 if (java_lang_Class::is_primitive(mirror)) { 1107 // Primitive objects does not have any interfaces 1108 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1109 return (jobjectArray) JNIHandles::make_local(env, r); 1110 } 1111 1112 Klass* klass = java_lang_Class::as_Klass(mirror); 1113 // Figure size of result array 1114 int size; 1115 if (klass->is_instance_klass()) { 1116 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1117 } else { 1118 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1119 size = 2; 1120 } 1121 1122 // Allocate result array 1123 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1124 objArrayHandle result (THREAD, r); 1125 // Fill in result 1126 if (klass->is_instance_klass()) { 1127 // Regular instance klass, fill in all local interfaces 1128 for (int index = 0; index < size; index++) { 1129 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1130 result->obj_at_put(index, k->java_mirror()); 1131 } 1132 } else { 1133 // All arrays implement java.lang.Cloneable and java.io.Serializable 1134 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1135 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1136 } 1137 return (jobjectArray) JNIHandles::make_local(env, result()); 1138 JVM_END 1139 1140 1141 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1142 JVMWrapper("JVM_IsInterface"); 1143 oop mirror = JNIHandles::resolve_non_null(cls); 1144 if (java_lang_Class::is_primitive(mirror)) { 1145 return JNI_FALSE; 1146 } 1147 Klass* k = java_lang_Class::as_Klass(mirror); 1148 jboolean result = k->is_interface(); 1149 assert(!result || k->is_instance_klass(), 1150 "all interfaces are instance types"); 1151 // The compiler intrinsic for isInterface tests the 1152 // Klass::_access_flags bits in the same way. 1153 return result; 1154 JVM_END 1155 1156 1157 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1158 JVMWrapper("JVM_GetClassSigners"); 1159 JvmtiVMObjectAllocEventCollector oam; 1160 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1161 // There are no signers for primitive types 1162 return NULL; 1163 } 1164 1165 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls))); 1166 1167 // If there are no signers set in the class, or if the class 1168 // is an array, return NULL. 1169 if (signers == NULL) return NULL; 1170 1171 // copy of the signers array 1172 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1173 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1174 for (int index = 0; index < signers->length(); index++) { 1175 signers_copy->obj_at_put(index, signers->obj_at(index)); 1176 } 1177 1178 // return the copy 1179 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1180 JVM_END 1181 1182 1183 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1184 JVMWrapper("JVM_SetClassSigners"); 1185 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1186 // This call is ignored for primitive types and arrays. 1187 // Signers are only set once, ClassLoader.java, and thus shouldn't 1188 // be called with an array. Only the bootstrap loader creates arrays. 1189 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1190 if (k->is_instance_klass()) { 1191 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1192 } 1193 } 1194 JVM_END 1195 1196 1197 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1198 JVMWrapper("JVM_GetProtectionDomain"); 1199 if (JNIHandles::resolve(cls) == NULL) { 1200 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1201 } 1202 1203 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1204 // Primitive types does not have a protection domain. 1205 return NULL; 1206 } 1207 1208 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1209 return (jobject) JNIHandles::make_local(env, pd); 1210 JVM_END 1211 1212 1213 // Returns the inherited_access_control_context field of the running thread. 1214 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1215 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1216 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1217 return JNIHandles::make_local(env, result); 1218 JVM_END 1219 1220 class RegisterArrayForGC { 1221 private: 1222 JavaThread *_thread; 1223 public: 1224 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1225 _thread = thread; 1226 _thread->register_array_for_gc(array); 1227 } 1228 1229 ~RegisterArrayForGC() { 1230 _thread->register_array_for_gc(NULL); 1231 } 1232 }; 1233 1234 1235 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1236 JVMWrapper("JVM_GetStackAccessControlContext"); 1237 if (!UsePrivilegedStack) return NULL; 1238 1239 ResourceMark rm(THREAD); 1240 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1241 JvmtiVMObjectAllocEventCollector oam; 1242 1243 // count the protection domains on the execution stack. We collapse 1244 // duplicate consecutive protection domains into a single one, as 1245 // well as stopping when we hit a privileged frame. 1246 1247 oop previous_protection_domain = NULL; 1248 Handle privileged_context(thread, NULL); 1249 bool is_privileged = false; 1250 oop protection_domain = NULL; 1251 1252 // Iterate through Java frames 1253 vframeStream vfst(thread); 1254 for(; !vfst.at_end(); vfst.next()) { 1255 // get method of frame 1256 Method* method = vfst.method(); 1257 1258 // stop at the first privileged frame 1259 if (method->method_holder() == SystemDictionary::AccessController_klass() && 1260 method->name() == vmSymbols::executePrivileged_name()) 1261 { 1262 // this frame is privileged 1263 is_privileged = true; 1264 1265 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1266 1267 StackValueCollection* locals = priv->locals(); 1268 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1269 StackValue* clr_sv = locals->at(2); // Class<?> caller 1270 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1271 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1272 privileged_context = ctx_sv->get_obj(); 1273 Handle caller = clr_sv->get_obj(); 1274 1275 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1276 protection_domain = caller_klass->protection_domain(); 1277 } else { 1278 protection_domain = method->method_holder()->protection_domain(); 1279 } 1280 1281 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1282 local_array->push(protection_domain); 1283 previous_protection_domain = protection_domain; 1284 } 1285 1286 if (is_privileged) break; 1287 } 1288 1289 1290 // either all the domains on the stack were system domains, or 1291 // we had a privileged system domain 1292 if (local_array->is_empty()) { 1293 if (is_privileged && privileged_context.is_null()) return NULL; 1294 1295 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1296 return JNIHandles::make_local(env, result); 1297 } 1298 1299 // the resource area must be registered in case of a gc 1300 RegisterArrayForGC ragc(thread, local_array); 1301 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1302 local_array->length(), CHECK_NULL); 1303 objArrayHandle h_context(thread, context); 1304 for (int index = 0; index < local_array->length(); index++) { 1305 h_context->obj_at_put(index, local_array->at(index)); 1306 } 1307 1308 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1309 1310 return JNIHandles::make_local(env, result); 1311 JVM_END 1312 1313 1314 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1315 JVMWrapper("JVM_IsArrayClass"); 1316 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1317 return (k != NULL) && k->is_array_klass() ? true : false; 1318 JVM_END 1319 1320 1321 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1322 JVMWrapper("JVM_IsPrimitiveClass"); 1323 oop mirror = JNIHandles::resolve_non_null(cls); 1324 return (jboolean) java_lang_Class::is_primitive(mirror); 1325 JVM_END 1326 1327 1328 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1329 JVMWrapper("JVM_GetClassModifiers"); 1330 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1331 // Primitive type 1332 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1333 } 1334 1335 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1336 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1337 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1338 return k->modifier_flags(); 1339 JVM_END 1340 1341 1342 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1343 1344 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1345 JvmtiVMObjectAllocEventCollector oam; 1346 // ofClass is a reference to a java_lang_Class object. The mirror object 1347 // of an InstanceKlass 1348 1349 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1350 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1351 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1352 return (jobjectArray)JNIHandles::make_local(env, result); 1353 } 1354 1355 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1356 InnerClassesIterator iter(k); 1357 1358 if (iter.length() == 0) { 1359 // Neither an inner nor outer class 1360 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1361 return (jobjectArray)JNIHandles::make_local(env, result); 1362 } 1363 1364 // find inner class info 1365 constantPoolHandle cp(thread, k->constants()); 1366 int length = iter.length(); 1367 1368 // Allocate temp. result array 1369 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1370 objArrayHandle result (THREAD, r); 1371 int members = 0; 1372 1373 for (; !iter.done(); iter.next()) { 1374 int ioff = iter.inner_class_info_index(); 1375 int ooff = iter.outer_class_info_index(); 1376 1377 if (ioff != 0 && ooff != 0) { 1378 // Check to see if the name matches the class we're looking for 1379 // before attempting to find the class. 1380 if (cp->klass_name_at_matches(k, ooff)) { 1381 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1382 if (outer_klass == k) { 1383 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1384 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1385 1386 // Throws an exception if outer klass has not declared k as 1387 // an inner klass 1388 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1389 1390 result->obj_at_put(members, inner_klass->java_mirror()); 1391 members++; 1392 } 1393 } 1394 } 1395 } 1396 1397 if (members != length) { 1398 // Return array of right length 1399 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1400 for(int i = 0; i < members; i++) { 1401 res->obj_at_put(i, result->obj_at(i)); 1402 } 1403 return (jobjectArray)JNIHandles::make_local(env, res); 1404 } 1405 1406 return (jobjectArray)JNIHandles::make_local(env, result()); 1407 JVM_END 1408 1409 1410 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1411 { 1412 // ofClass is a reference to a java_lang_Class object. 1413 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1414 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1415 return NULL; 1416 } 1417 1418 bool inner_is_member = false; 1419 Klass* outer_klass 1420 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1421 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1422 if (outer_klass == NULL) return NULL; // already a top-level class 1423 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1424 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1425 } 1426 JVM_END 1427 1428 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1429 { 1430 oop mirror = JNIHandles::resolve_non_null(cls); 1431 if (java_lang_Class::is_primitive(mirror) || 1432 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1433 return NULL; 1434 } 1435 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1436 int ooff = 0, noff = 0; 1437 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1438 if (noff != 0) { 1439 constantPoolHandle i_cp(thread, k->constants()); 1440 Symbol* name = i_cp->symbol_at(noff); 1441 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1442 return (jstring) JNIHandles::make_local(env, str()); 1443 } 1444 } 1445 return NULL; 1446 } 1447 JVM_END 1448 1449 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1450 assert (cls != NULL, "illegal class"); 1451 JVMWrapper("JVM_GetClassSignature"); 1452 JvmtiVMObjectAllocEventCollector oam; 1453 ResourceMark rm(THREAD); 1454 // Return null for arrays and primatives 1455 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1456 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1457 if (k->is_instance_klass()) { 1458 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1459 if (sym == NULL) return NULL; 1460 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1461 return (jstring) JNIHandles::make_local(env, str()); 1462 } 1463 } 1464 return NULL; 1465 JVM_END 1466 1467 1468 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1469 assert (cls != NULL, "illegal class"); 1470 JVMWrapper("JVM_GetClassAnnotations"); 1471 1472 // Return null for arrays and primitives 1473 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1474 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1475 if (k->is_instance_klass()) { 1476 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1477 return (jbyteArray) JNIHandles::make_local(env, a); 1478 } 1479 } 1480 return NULL; 1481 JVM_END 1482 1483 1484 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1485 // some of this code was adapted from from jni_FromReflectedField 1486 1487 oop reflected = JNIHandles::resolve_non_null(field); 1488 oop mirror = java_lang_reflect_Field::clazz(reflected); 1489 Klass* k = java_lang_Class::as_Klass(mirror); 1490 int slot = java_lang_reflect_Field::slot(reflected); 1491 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1492 1493 InstanceKlass* ik = InstanceKlass::cast(k); 1494 intptr_t offset = ik->field_offset(slot); 1495 1496 if (modifiers & JVM_ACC_STATIC) { 1497 // for static fields we only look in the current class 1498 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1499 assert(false, "cannot find static field"); 1500 return false; 1501 } 1502 } else { 1503 // for instance fields we start with the current class and work 1504 // our way up through the superclass chain 1505 if (!ik->find_field_from_offset(offset, false, &fd)) { 1506 assert(false, "cannot find instance field"); 1507 return false; 1508 } 1509 } 1510 return true; 1511 } 1512 1513 static Method* jvm_get_method_common(jobject method) { 1514 // some of this code was adapted from from jni_FromReflectedMethod 1515 1516 oop reflected = JNIHandles::resolve_non_null(method); 1517 oop mirror = NULL; 1518 int slot = 0; 1519 1520 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1521 mirror = java_lang_reflect_Constructor::clazz(reflected); 1522 slot = java_lang_reflect_Constructor::slot(reflected); 1523 } else { 1524 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1525 "wrong type"); 1526 mirror = java_lang_reflect_Method::clazz(reflected); 1527 slot = java_lang_reflect_Method::slot(reflected); 1528 } 1529 Klass* k = java_lang_Class::as_Klass(mirror); 1530 1531 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1532 assert(m != NULL, "cannot find method"); 1533 return m; // caller has to deal with NULL in product mode 1534 } 1535 1536 /* Type use annotations support (JDK 1.8) */ 1537 1538 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1539 assert (cls != NULL, "illegal class"); 1540 JVMWrapper("JVM_GetClassTypeAnnotations"); 1541 ResourceMark rm(THREAD); 1542 // Return null for arrays and primitives 1543 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1544 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1545 if (k->is_instance_klass()) { 1546 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1547 if (type_annotations != NULL) { 1548 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1549 return (jbyteArray) JNIHandles::make_local(env, a); 1550 } 1551 } 1552 } 1553 return NULL; 1554 JVM_END 1555 1556 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1557 assert (method != NULL, "illegal method"); 1558 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1559 1560 // method is a handle to a java.lang.reflect.Method object 1561 Method* m = jvm_get_method_common(method); 1562 if (m == NULL) { 1563 return NULL; 1564 } 1565 1566 AnnotationArray* type_annotations = m->type_annotations(); 1567 if (type_annotations != NULL) { 1568 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1569 return (jbyteArray) JNIHandles::make_local(env, a); 1570 } 1571 1572 return NULL; 1573 JVM_END 1574 1575 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1576 assert (field != NULL, "illegal field"); 1577 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1578 1579 fieldDescriptor fd; 1580 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1581 if (!gotFd) { 1582 return NULL; 1583 } 1584 1585 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1586 JVM_END 1587 1588 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1589 if (!cp->is_within_bounds(index)) { 1590 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1591 } 1592 } 1593 1594 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1595 { 1596 JVMWrapper("JVM_GetMethodParameters"); 1597 // method is a handle to a java.lang.reflect.Method object 1598 Method* method_ptr = jvm_get_method_common(method); 1599 methodHandle mh (THREAD, method_ptr); 1600 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1601 const int num_params = mh->method_parameters_length(); 1602 1603 if (num_params < 0) { 1604 // A -1 return value from method_parameters_length means there is no 1605 // parameter data. Return null to indicate this to the reflection 1606 // API. 1607 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1608 return (jobjectArray)NULL; 1609 } else { 1610 // Otherwise, we return something up to reflection, even if it is 1611 // a zero-length array. Why? Because in some cases this can 1612 // trigger a MalformedParametersException. 1613 1614 // make sure all the symbols are properly formatted 1615 for (int i = 0; i < num_params; i++) { 1616 MethodParametersElement* params = mh->method_parameters_start(); 1617 int index = params[i].name_cp_index; 1618 constantPoolHandle cp(THREAD, mh->constants()); 1619 bounds_check(cp, index, CHECK_NULL); 1620 1621 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1622 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1623 "Wrong type at constant pool index"); 1624 } 1625 1626 } 1627 1628 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1629 objArrayHandle result (THREAD, result_oop); 1630 1631 for (int i = 0; i < num_params; i++) { 1632 MethodParametersElement* params = mh->method_parameters_start(); 1633 // For a 0 index, give a NULL symbol 1634 Symbol* sym = 0 != params[i].name_cp_index ? 1635 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1636 int flags = params[i].flags; 1637 oop param = Reflection::new_parameter(reflected_method, i, sym, 1638 flags, CHECK_NULL); 1639 result->obj_at_put(i, param); 1640 } 1641 return (jobjectArray)JNIHandles::make_local(env, result()); 1642 } 1643 } 1644 JVM_END 1645 1646 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1647 1648 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1649 { 1650 JVMWrapper("JVM_GetClassDeclaredFields"); 1651 JvmtiVMObjectAllocEventCollector oam; 1652 1653 // Exclude primitive types and array types 1654 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1655 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1656 // Return empty array 1657 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1658 return (jobjectArray) JNIHandles::make_local(env, res); 1659 } 1660 1661 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1662 constantPoolHandle cp(THREAD, k->constants()); 1663 1664 // Ensure class is linked 1665 k->link_class(CHECK_NULL); 1666 1667 // Allocate result 1668 int num_fields; 1669 1670 if (publicOnly) { 1671 num_fields = 0; 1672 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1673 if (fs.access_flags().is_public()) ++num_fields; 1674 } 1675 } else { 1676 num_fields = k->java_fields_count(); 1677 } 1678 1679 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1680 objArrayHandle result (THREAD, r); 1681 1682 int out_idx = 0; 1683 fieldDescriptor fd; 1684 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1685 if (!publicOnly || fs.access_flags().is_public()) { 1686 fd.reinitialize(k, fs.index()); 1687 oop field = Reflection::new_field(&fd, CHECK_NULL); 1688 result->obj_at_put(out_idx, field); 1689 ++out_idx; 1690 } 1691 } 1692 assert(out_idx == num_fields, "just checking"); 1693 return (jobjectArray) JNIHandles::make_local(env, result()); 1694 } 1695 JVM_END 1696 1697 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1698 { 1699 JVMWrapper("JVM_IsRecord"); 1700 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1701 if (k != NULL && k->is_instance_klass()) { 1702 InstanceKlass* ik = InstanceKlass::cast(k); 1703 return ik->is_record(); 1704 } else { 1705 return false; 1706 } 1707 } 1708 JVM_END 1709 1710 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1711 { 1712 JVMWrapper("JVM_GetRecordComponents"); 1713 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1714 assert(c->is_instance_klass(), "must be"); 1715 InstanceKlass* ik = InstanceKlass::cast(c); 1716 1717 if (ik->is_record()) { 1718 Array<RecordComponent*>* components = ik->record_components(); 1719 assert(components != NULL, "components should not be NULL"); 1720 { 1721 JvmtiVMObjectAllocEventCollector oam; 1722 constantPoolHandle cp(THREAD, ik->constants()); 1723 int length = components->length(); 1724 assert(length >= 0, "unexpected record_components length"); 1725 objArrayOop record_components = 1726 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL); 1727 objArrayHandle components_h (THREAD, record_components); 1728 1729 for (int x = 0; x < length; x++) { 1730 RecordComponent* component = components->at(x); 1731 assert(component != NULL, "unexpected NULL record component"); 1732 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1733 components_h->obj_at_put(x, component_oop); 1734 } 1735 return (jobjectArray)JNIHandles::make_local(components_h()); 1736 } 1737 } 1738 1739 // Return empty array if ofClass is not a record. 1740 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL); 1741 return (jobjectArray)JNIHandles::make_local(env, result); 1742 } 1743 JVM_END 1744 1745 static bool select_method(const methodHandle& method, bool want_constructor) { 1746 if (want_constructor) { 1747 return (method->is_initializer() && !method->is_static()); 1748 } else { 1749 return (!method->is_initializer() && !method->is_overpass()); 1750 } 1751 } 1752 1753 static jobjectArray get_class_declared_methods_helper( 1754 JNIEnv *env, 1755 jclass ofClass, jboolean publicOnly, 1756 bool want_constructor, 1757 Klass* klass, TRAPS) { 1758 1759 JvmtiVMObjectAllocEventCollector oam; 1760 1761 // Exclude primitive types and array types 1762 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1763 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1764 // Return empty array 1765 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1766 return (jobjectArray) JNIHandles::make_local(env, res); 1767 } 1768 1769 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1770 1771 // Ensure class is linked 1772 k->link_class(CHECK_NULL); 1773 1774 Array<Method*>* methods = k->methods(); 1775 int methods_length = methods->length(); 1776 1777 // Save original method_idnum in case of redefinition, which can change 1778 // the idnum of obsolete methods. The new method will have the same idnum 1779 // but if we refresh the methods array, the counts will be wrong. 1780 ResourceMark rm(THREAD); 1781 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1782 int num_methods = 0; 1783 1784 for (int i = 0; i < methods_length; i++) { 1785 methodHandle method(THREAD, methods->at(i)); 1786 if (select_method(method, want_constructor)) { 1787 if (!publicOnly || method->is_public()) { 1788 idnums->push(method->method_idnum()); 1789 ++num_methods; 1790 } 1791 } 1792 } 1793 1794 // Allocate result 1795 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1796 objArrayHandle result (THREAD, r); 1797 1798 // Now just put the methods that we selected above, but go by their idnum 1799 // in case of redefinition. The methods can be redefined at any safepoint, 1800 // so above when allocating the oop array and below when creating reflect 1801 // objects. 1802 for (int i = 0; i < num_methods; i++) { 1803 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1804 if (method.is_null()) { 1805 // Method may have been deleted and seems this API can handle null 1806 // Otherwise should probably put a method that throws NSME 1807 result->obj_at_put(i, NULL); 1808 } else { 1809 oop m; 1810 if (want_constructor) { 1811 m = Reflection::new_constructor(method, CHECK_NULL); 1812 } else { 1813 m = Reflection::new_method(method, false, CHECK_NULL); 1814 } 1815 result->obj_at_put(i, m); 1816 } 1817 } 1818 1819 return (jobjectArray) JNIHandles::make_local(env, result()); 1820 } 1821 1822 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1823 { 1824 JVMWrapper("JVM_GetClassDeclaredMethods"); 1825 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1826 /*want_constructor*/ false, 1827 SystemDictionary::reflect_Method_klass(), THREAD); 1828 } 1829 JVM_END 1830 1831 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1832 { 1833 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1834 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1835 /*want_constructor*/ true, 1836 SystemDictionary::reflect_Constructor_klass(), THREAD); 1837 } 1838 JVM_END 1839 1840 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1841 { 1842 JVMWrapper("JVM_GetClassAccessFlags"); 1843 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1844 // Primitive type 1845 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1846 } 1847 1848 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1849 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1850 } 1851 JVM_END 1852 1853 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1854 { 1855 JVMWrapper("JVM_AreNestMates"); 1856 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1857 assert(c->is_instance_klass(), "must be"); 1858 InstanceKlass* ck = InstanceKlass::cast(c); 1859 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 1860 assert(m->is_instance_klass(), "must be"); 1861 InstanceKlass* mk = InstanceKlass::cast(m); 1862 return ck->has_nestmate_access_to(mk, THREAD); 1863 } 1864 JVM_END 1865 1866 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1867 { 1868 // current is not a primitive or array class 1869 JVMWrapper("JVM_GetNestHost"); 1870 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1871 assert(c->is_instance_klass(), "must be"); 1872 InstanceKlass* ck = InstanceKlass::cast(c); 1873 // Don't post exceptions if validation fails 1874 InstanceKlass* host = ck->nest_host(NULL, THREAD); 1875 return (jclass) (host == NULL ? NULL : 1876 JNIHandles::make_local(THREAD, host->java_mirror())); 1877 } 1878 JVM_END 1879 1880 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1881 { 1882 // current is not a primitive or array class 1883 JVMWrapper("JVM_GetNestMembers"); 1884 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1885 assert(c->is_instance_klass(), "must be"); 1886 InstanceKlass* ck = InstanceKlass::cast(c); 1887 // Get the nest host for this nest - throw ICCE if validation fails 1888 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError(); 1889 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL); 1890 1891 { 1892 JvmtiVMObjectAllocEventCollector oam; 1893 Array<u2>* members = host->nest_members(); 1894 int length = members == NULL ? 0 : members->length(); 1895 // nest host is first in the array so make it one bigger 1896 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 1897 length + 1, CHECK_NULL); 1898 objArrayHandle result (THREAD, r); 1899 result->obj_at_put(0, host->java_mirror()); 1900 if (length != 0) { 1901 int i; 1902 for (i = 0; i < length; i++) { 1903 int cp_index = members->at(i); 1904 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL); 1905 if (k->is_instance_klass()) { 1906 InstanceKlass* nest_host_k = 1907 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL); 1908 if (nest_host_k == host) { 1909 result->obj_at_put(i+1, k->java_mirror()); 1910 } 1911 else { 1912 // k's nest host is legal but it isn't our host so 1913 // throw ICCE 1914 ResourceMark rm(THREAD); 1915 Exceptions::fthrow(THREAD_AND_LOCATION, 1916 icce, 1917 "Nest member %s in %s declares a different nest host of %s", 1918 k->external_name(), 1919 host->external_name(), 1920 nest_host_k->external_name() 1921 ); 1922 return NULL; 1923 } 1924 } 1925 else { 1926 // we have a bad nest member entry - throw ICCE 1927 ResourceMark rm(THREAD); 1928 Exceptions::fthrow(THREAD_AND_LOCATION, 1929 icce, 1930 "Class %s can not be a nest member of %s", 1931 k->external_name(), 1932 host->external_name() 1933 ); 1934 return NULL; 1935 } 1936 } 1937 } 1938 else { 1939 assert(host == ck, "must be singleton nest"); 1940 } 1941 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1942 } 1943 } 1944 JVM_END 1945 1946 // Constant pool access ////////////////////////////////////////////////////////// 1947 1948 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1949 { 1950 JVMWrapper("JVM_GetClassConstantPool"); 1951 JvmtiVMObjectAllocEventCollector oam; 1952 1953 // Return null for primitives and arrays 1954 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1955 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1956 if (k->is_instance_klass()) { 1957 InstanceKlass* k_h = InstanceKlass::cast(k); 1958 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1959 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1960 return JNIHandles::make_local(jcp()); 1961 } 1962 } 1963 return NULL; 1964 } 1965 JVM_END 1966 1967 1968 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1969 { 1970 JVMWrapper("JVM_ConstantPoolGetSize"); 1971 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1972 return cp->length(); 1973 } 1974 JVM_END 1975 1976 1977 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1978 { 1979 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1980 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1981 bounds_check(cp, index, CHECK_NULL); 1982 constantTag tag = cp->tag_at(index); 1983 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1984 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1985 } 1986 Klass* k = cp->klass_at(index, CHECK_NULL); 1987 return (jclass) JNIHandles::make_local(k->java_mirror()); 1988 } 1989 JVM_END 1990 1991 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1992 { 1993 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1994 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1995 bounds_check(cp, index, CHECK_NULL); 1996 constantTag tag = cp->tag_at(index); 1997 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1998 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1999 } 2000 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2001 if (k == NULL) return NULL; 2002 return (jclass) JNIHandles::make_local(k->java_mirror()); 2003 } 2004 JVM_END 2005 2006 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2007 constantTag tag = cp->tag_at(index); 2008 if (!tag.is_method() && !tag.is_interface_method()) { 2009 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2010 } 2011 int klass_ref = cp->uncached_klass_ref_index_at(index); 2012 Klass* k_o; 2013 if (force_resolution) { 2014 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2015 } else { 2016 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2017 if (k_o == NULL) return NULL; 2018 } 2019 InstanceKlass* k = InstanceKlass::cast(k_o); 2020 Symbol* name = cp->uncached_name_ref_at(index); 2021 Symbol* sig = cp->uncached_signature_ref_at(index); 2022 methodHandle m (THREAD, k->find_method(name, sig)); 2023 if (m.is_null()) { 2024 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2025 } 2026 oop method; 2027 if (!m->is_initializer() || m->is_static()) { 2028 method = Reflection::new_method(m, true, CHECK_NULL); 2029 } else { 2030 method = Reflection::new_constructor(m, CHECK_NULL); 2031 } 2032 return JNIHandles::make_local(method); 2033 } 2034 2035 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2036 { 2037 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 2038 JvmtiVMObjectAllocEventCollector oam; 2039 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2040 bounds_check(cp, index, CHECK_NULL); 2041 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2042 return res; 2043 } 2044 JVM_END 2045 2046 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2047 { 2048 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2049 JvmtiVMObjectAllocEventCollector oam; 2050 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2051 bounds_check(cp, index, CHECK_NULL); 2052 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2053 return res; 2054 } 2055 JVM_END 2056 2057 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2058 constantTag tag = cp->tag_at(index); 2059 if (!tag.is_field()) { 2060 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2061 } 2062 int klass_ref = cp->uncached_klass_ref_index_at(index); 2063 Klass* k_o; 2064 if (force_resolution) { 2065 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2066 } else { 2067 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2068 if (k_o == NULL) return NULL; 2069 } 2070 InstanceKlass* k = InstanceKlass::cast(k_o); 2071 Symbol* name = cp->uncached_name_ref_at(index); 2072 Symbol* sig = cp->uncached_signature_ref_at(index); 2073 fieldDescriptor fd; 2074 Klass* target_klass = k->find_field(name, sig, &fd); 2075 if (target_klass == NULL) { 2076 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2077 } 2078 oop field = Reflection::new_field(&fd, CHECK_NULL); 2079 return JNIHandles::make_local(field); 2080 } 2081 2082 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2083 { 2084 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2085 JvmtiVMObjectAllocEventCollector oam; 2086 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2087 bounds_check(cp, index, CHECK_NULL); 2088 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2089 return res; 2090 } 2091 JVM_END 2092 2093 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2094 { 2095 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2096 JvmtiVMObjectAllocEventCollector oam; 2097 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2098 bounds_check(cp, index, CHECK_NULL); 2099 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2100 return res; 2101 } 2102 JVM_END 2103 2104 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2105 { 2106 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2107 JvmtiVMObjectAllocEventCollector oam; 2108 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2109 bounds_check(cp, index, CHECK_NULL); 2110 constantTag tag = cp->tag_at(index); 2111 if (!tag.is_field_or_method()) { 2112 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2113 } 2114 int klass_ref = cp->uncached_klass_ref_index_at(index); 2115 Symbol* klass_name = cp->klass_name_at(klass_ref); 2116 Symbol* member_name = cp->uncached_name_ref_at(index); 2117 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2118 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2119 objArrayHandle dest(THREAD, dest_o); 2120 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2121 dest->obj_at_put(0, str()); 2122 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2123 dest->obj_at_put(1, str()); 2124 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2125 dest->obj_at_put(2, str()); 2126 return (jobjectArray) JNIHandles::make_local(dest()); 2127 } 2128 JVM_END 2129 2130 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2131 { 2132 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2133 JvmtiVMObjectAllocEventCollector oam; 2134 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2135 bounds_check(cp, index, CHECK_0); 2136 constantTag tag = cp->tag_at(index); 2137 if (!tag.is_field_or_method()) { 2138 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2139 } 2140 return (jint) cp->uncached_klass_ref_index_at(index); 2141 } 2142 JVM_END 2143 2144 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2145 { 2146 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2147 JvmtiVMObjectAllocEventCollector oam; 2148 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2149 bounds_check(cp, index, CHECK_0); 2150 constantTag tag = cp->tag_at(index); 2151 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2152 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2153 } 2154 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2155 } 2156 JVM_END 2157 2158 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2159 { 2160 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2161 JvmtiVMObjectAllocEventCollector oam; 2162 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2163 bounds_check(cp, index, CHECK_NULL); 2164 constantTag tag = cp->tag_at(index); 2165 if (!tag.is_name_and_type()) { 2166 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2167 } 2168 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2169 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2170 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2171 objArrayHandle dest(THREAD, dest_o); 2172 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2173 dest->obj_at_put(0, str()); 2174 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2175 dest->obj_at_put(1, str()); 2176 return (jobjectArray) JNIHandles::make_local(dest()); 2177 } 2178 JVM_END 2179 2180 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2181 { 2182 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2183 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2184 bounds_check(cp, index, CHECK_0); 2185 constantTag tag = cp->tag_at(index); 2186 if (!tag.is_int()) { 2187 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2188 } 2189 return cp->int_at(index); 2190 } 2191 JVM_END 2192 2193 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2194 { 2195 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2196 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2197 bounds_check(cp, index, CHECK_(0L)); 2198 constantTag tag = cp->tag_at(index); 2199 if (!tag.is_long()) { 2200 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2201 } 2202 return cp->long_at(index); 2203 } 2204 JVM_END 2205 2206 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2207 { 2208 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2209 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2210 bounds_check(cp, index, CHECK_(0.0f)); 2211 constantTag tag = cp->tag_at(index); 2212 if (!tag.is_float()) { 2213 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2214 } 2215 return cp->float_at(index); 2216 } 2217 JVM_END 2218 2219 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2220 { 2221 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2222 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2223 bounds_check(cp, index, CHECK_(0.0)); 2224 constantTag tag = cp->tag_at(index); 2225 if (!tag.is_double()) { 2226 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2227 } 2228 return cp->double_at(index); 2229 } 2230 JVM_END 2231 2232 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2233 { 2234 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2235 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2236 bounds_check(cp, index, CHECK_NULL); 2237 constantTag tag = cp->tag_at(index); 2238 if (!tag.is_string()) { 2239 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2240 } 2241 oop str = cp->string_at(index, CHECK_NULL); 2242 return (jstring) JNIHandles::make_local(str); 2243 } 2244 JVM_END 2245 2246 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2247 { 2248 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2249 JvmtiVMObjectAllocEventCollector oam; 2250 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2251 bounds_check(cp, index, CHECK_NULL); 2252 constantTag tag = cp->tag_at(index); 2253 if (!tag.is_symbol()) { 2254 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2255 } 2256 Symbol* sym = cp->symbol_at(index); 2257 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2258 return (jstring) JNIHandles::make_local(str()); 2259 } 2260 JVM_END 2261 2262 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2263 { 2264 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2265 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2266 bounds_check(cp, index, CHECK_0); 2267 constantTag tag = cp->tag_at(index); 2268 jbyte result = tag.value(); 2269 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2270 // they are changed to the corresponding tags from the JVM spec, so that java code in 2271 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2272 if (tag.is_klass_or_reference()) { 2273 result = JVM_CONSTANT_Class; 2274 } else if (tag.is_string_index()) { 2275 result = JVM_CONSTANT_String; 2276 } else if (tag.is_method_type_in_error()) { 2277 result = JVM_CONSTANT_MethodType; 2278 } else if (tag.is_method_handle_in_error()) { 2279 result = JVM_CONSTANT_MethodHandle; 2280 } else if (tag.is_dynamic_constant_in_error()) { 2281 result = JVM_CONSTANT_Dynamic; 2282 } 2283 return result; 2284 } 2285 JVM_END 2286 2287 // Assertion support. ////////////////////////////////////////////////////////// 2288 2289 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2290 JVMWrapper("JVM_DesiredAssertionStatus"); 2291 assert(cls != NULL, "bad class"); 2292 2293 oop r = JNIHandles::resolve(cls); 2294 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2295 if (java_lang_Class::is_primitive(r)) return false; 2296 2297 Klass* k = java_lang_Class::as_Klass(r); 2298 assert(k->is_instance_klass(), "must be an instance klass"); 2299 if (!k->is_instance_klass()) return false; 2300 2301 ResourceMark rm(THREAD); 2302 const char* name = k->name()->as_C_string(); 2303 bool system_class = k->class_loader() == NULL; 2304 return JavaAssertions::enabled(name, system_class); 2305 2306 JVM_END 2307 2308 2309 // Return a new AssertionStatusDirectives object with the fields filled in with 2310 // command-line assertion arguments (i.e., -ea, -da). 2311 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2312 JVMWrapper("JVM_AssertionStatusDirectives"); 2313 JvmtiVMObjectAllocEventCollector oam; 2314 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2315 return JNIHandles::make_local(env, asd); 2316 JVM_END 2317 2318 // Verification //////////////////////////////////////////////////////////////////////////////// 2319 2320 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2321 2322 // RedefineClasses support: bug 6214132 caused verification to fail. 2323 // All functions from this section should call the jvmtiThreadSate function: 2324 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2325 // The function returns a Klass* of the _scratch_class if the verifier 2326 // was invoked in the middle of the class redefinition. 2327 // Otherwise it returns its argument value which is the _the_class Klass*. 2328 // Please, refer to the description in the jvmtiThreadSate.hpp. 2329 2330 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2331 JVMWrapper("JVM_GetClassNameUTF"); 2332 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2333 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2334 return k->name()->as_utf8(); 2335 JVM_END 2336 2337 2338 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2339 JVMWrapper("JVM_GetClassCPTypes"); 2340 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2341 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2342 // types will have length zero if this is not an InstanceKlass 2343 // (length is determined by call to JVM_GetClassCPEntriesCount) 2344 if (k->is_instance_klass()) { 2345 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2346 for (int index = cp->length() - 1; index >= 0; index--) { 2347 constantTag tag = cp->tag_at(index); 2348 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2349 } 2350 } 2351 JVM_END 2352 2353 2354 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2355 JVMWrapper("JVM_GetClassCPEntriesCount"); 2356 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2357 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2358 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2359 JVM_END 2360 2361 2362 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2363 JVMWrapper("JVM_GetClassFieldsCount"); 2364 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2365 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2366 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2367 JVM_END 2368 2369 2370 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2371 JVMWrapper("JVM_GetClassMethodsCount"); 2372 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2373 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2374 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2375 JVM_END 2376 2377 2378 // The following methods, used for the verifier, are never called with 2379 // array klasses, so a direct cast to InstanceKlass is safe. 2380 // Typically, these methods are called in a loop with bounds determined 2381 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2382 // zero for arrays. 2383 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2384 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 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 int length = method->checked_exceptions_length(); 2389 if (length > 0) { 2390 CheckedExceptionElement* table= method->checked_exceptions_start(); 2391 for (int i = 0; i < length; i++) { 2392 exceptions[i] = table[i].class_cp_index; 2393 } 2394 } 2395 JVM_END 2396 2397 2398 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2399 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2400 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2401 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2402 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2403 return method->checked_exceptions_length(); 2404 JVM_END 2405 2406 2407 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2408 JVMWrapper("JVM_GetMethodIxByteCode"); 2409 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2410 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2411 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2412 memcpy(code, method->code_base(), method->code_size()); 2413 JVM_END 2414 2415 2416 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2417 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2418 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2419 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2420 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2421 return method->code_size(); 2422 JVM_END 2423 2424 2425 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2426 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2427 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2428 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2429 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2430 ExceptionTable extable(method); 2431 entry->start_pc = extable.start_pc(entry_index); 2432 entry->end_pc = extable.end_pc(entry_index); 2433 entry->handler_pc = extable.handler_pc(entry_index); 2434 entry->catchType = extable.catch_type_index(entry_index); 2435 JVM_END 2436 2437 2438 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2439 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2440 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2441 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2442 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2443 return method->exception_table_length(); 2444 JVM_END 2445 2446 2447 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2448 JVMWrapper("JVM_GetMethodIxModifiers"); 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->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2453 JVM_END 2454 2455 2456 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2457 JVMWrapper("JVM_GetFieldIxModifiers"); 2458 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2459 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2460 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2461 JVM_END 2462 2463 2464 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2465 JVMWrapper("JVM_GetMethodIxLocalsCount"); 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->max_locals(); 2470 JVM_END 2471 2472 2473 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2474 JVMWrapper("JVM_GetMethodIxArgsSize"); 2475 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2476 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2477 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2478 return method->size_of_parameters(); 2479 JVM_END 2480 2481 2482 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2483 JVMWrapper("JVM_GetMethodIxMaxStack"); 2484 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2485 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2486 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2487 return method->verifier_max_stack(); 2488 JVM_END 2489 2490 2491 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2492 JVMWrapper("JVM_IsConstructorIx"); 2493 ResourceMark rm(THREAD); 2494 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2495 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2496 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2497 return method->name() == vmSymbols::object_initializer_name(); 2498 JVM_END 2499 2500 2501 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2502 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2503 ResourceMark rm(THREAD); 2504 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2505 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2506 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2507 return method->is_overpass(); 2508 JVM_END 2509 2510 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2511 JVMWrapper("JVM_GetMethodIxIxUTF"); 2512 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2513 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2514 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2515 return method->name()->as_utf8(); 2516 JVM_END 2517 2518 2519 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2520 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2521 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2522 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2523 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2524 return method->signature()->as_utf8(); 2525 JVM_END 2526 2527 /** 2528 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2529 * read entries in the constant pool. Since the old verifier always 2530 * works on a copy of the code, it will not see any rewriting that 2531 * may possibly occur in the middle of verification. So it is important 2532 * that nothing it calls tries to use the cpCache instead of the raw 2533 * constant pool, so we must use cp->uncached_x methods when appropriate. 2534 */ 2535 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2536 JVMWrapper("JVM_GetCPFieldNameUTF"); 2537 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2538 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2539 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2540 switch (cp->tag_at(cp_index).value()) { 2541 case JVM_CONSTANT_Fieldref: 2542 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2543 default: 2544 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2545 } 2546 ShouldNotReachHere(); 2547 return NULL; 2548 JVM_END 2549 2550 2551 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2552 JVMWrapper("JVM_GetCPMethodNameUTF"); 2553 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2554 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2555 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2556 switch (cp->tag_at(cp_index).value()) { 2557 case JVM_CONSTANT_InterfaceMethodref: 2558 case JVM_CONSTANT_Methodref: 2559 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2560 default: 2561 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2562 } 2563 ShouldNotReachHere(); 2564 return NULL; 2565 JVM_END 2566 2567 2568 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2569 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2570 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2571 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2572 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2573 switch (cp->tag_at(cp_index).value()) { 2574 case JVM_CONSTANT_InterfaceMethodref: 2575 case JVM_CONSTANT_Methodref: 2576 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2577 default: 2578 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2579 } 2580 ShouldNotReachHere(); 2581 return NULL; 2582 JVM_END 2583 2584 2585 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2586 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2587 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2588 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2589 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2590 switch (cp->tag_at(cp_index).value()) { 2591 case JVM_CONSTANT_Fieldref: 2592 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2593 default: 2594 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2595 } 2596 ShouldNotReachHere(); 2597 return NULL; 2598 JVM_END 2599 2600 2601 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2602 JVMWrapper("JVM_GetCPClassNameUTF"); 2603 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2604 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2605 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2606 Symbol* classname = cp->klass_name_at(cp_index); 2607 return classname->as_utf8(); 2608 JVM_END 2609 2610 2611 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2612 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2613 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2614 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2615 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2616 switch (cp->tag_at(cp_index).value()) { 2617 case JVM_CONSTANT_Fieldref: { 2618 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2619 Symbol* classname = cp->klass_name_at(class_index); 2620 return classname->as_utf8(); 2621 } 2622 default: 2623 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2624 } 2625 ShouldNotReachHere(); 2626 return NULL; 2627 JVM_END 2628 2629 2630 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2631 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2632 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2633 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2634 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2635 switch (cp->tag_at(cp_index).value()) { 2636 case JVM_CONSTANT_Methodref: 2637 case JVM_CONSTANT_InterfaceMethodref: { 2638 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2639 Symbol* classname = cp->klass_name_at(class_index); 2640 return classname->as_utf8(); 2641 } 2642 default: 2643 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2644 } 2645 ShouldNotReachHere(); 2646 return NULL; 2647 JVM_END 2648 2649 2650 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2651 JVMWrapper("JVM_GetCPFieldModifiers"); 2652 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2653 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2654 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2655 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2656 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2657 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2658 switch (cp->tag_at(cp_index).value()) { 2659 case JVM_CONSTANT_Fieldref: { 2660 Symbol* name = cp->uncached_name_ref_at(cp_index); 2661 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2662 InstanceKlass* ik = InstanceKlass::cast(k_called); 2663 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2664 if (fs.name() == name && fs.signature() == signature) { 2665 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2666 } 2667 } 2668 return -1; 2669 } 2670 default: 2671 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2672 } 2673 ShouldNotReachHere(); 2674 return 0; 2675 JVM_END 2676 2677 2678 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2679 JVMWrapper("JVM_GetCPMethodModifiers"); 2680 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2681 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2682 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2683 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2684 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2685 switch (cp->tag_at(cp_index).value()) { 2686 case JVM_CONSTANT_Methodref: 2687 case JVM_CONSTANT_InterfaceMethodref: { 2688 Symbol* name = cp->uncached_name_ref_at(cp_index); 2689 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2690 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2691 int methods_count = methods->length(); 2692 for (int i = 0; i < methods_count; i++) { 2693 Method* method = methods->at(i); 2694 if (method->name() == name && method->signature() == signature) { 2695 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2696 } 2697 } 2698 return -1; 2699 } 2700 default: 2701 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2702 } 2703 ShouldNotReachHere(); 2704 return 0; 2705 JVM_END 2706 2707 2708 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2709 2710 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2711 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2712 JVM_END 2713 2714 2715 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2716 JVMWrapper("JVM_IsSameClassPackage"); 2717 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2718 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2719 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2720 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2721 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2722 JVM_END 2723 2724 // Printing support ////////////////////////////////////////////////// 2725 extern "C" { 2726 2727 ATTRIBUTE_PRINTF(3, 0) 2728 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2729 // Reject count values that are negative signed values converted to 2730 // unsigned; see bug 4399518, 4417214 2731 if ((intptr_t)count <= 0) return -1; 2732 2733 int result = os::vsnprintf(str, count, fmt, args); 2734 if (result > 0 && (size_t)result >= count) { 2735 result = -1; 2736 } 2737 2738 return result; 2739 } 2740 2741 ATTRIBUTE_PRINTF(3, 4) 2742 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2743 va_list args; 2744 int len; 2745 va_start(args, fmt); 2746 len = jio_vsnprintf(str, count, fmt, args); 2747 va_end(args); 2748 return len; 2749 } 2750 2751 ATTRIBUTE_PRINTF(2, 3) 2752 int jio_fprintf(FILE* f, const char *fmt, ...) { 2753 int len; 2754 va_list args; 2755 va_start(args, fmt); 2756 len = jio_vfprintf(f, fmt, args); 2757 va_end(args); 2758 return len; 2759 } 2760 2761 ATTRIBUTE_PRINTF(2, 0) 2762 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2763 if (Arguments::vfprintf_hook() != NULL) { 2764 return Arguments::vfprintf_hook()(f, fmt, args); 2765 } else { 2766 return vfprintf(f, fmt, args); 2767 } 2768 } 2769 2770 ATTRIBUTE_PRINTF(1, 2) 2771 JNIEXPORT int jio_printf(const char *fmt, ...) { 2772 int len; 2773 va_list args; 2774 va_start(args, fmt); 2775 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2776 va_end(args); 2777 return len; 2778 } 2779 2780 // HotSpot specific jio method 2781 void jio_print(const char* s, size_t len) { 2782 // Try to make this function as atomic as possible. 2783 if (Arguments::vfprintf_hook() != NULL) { 2784 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2785 } else { 2786 // Make an unused local variable to avoid warning from gcc compiler. 2787 size_t count = ::write(defaultStream::output_fd(), s, (int)len); 2788 } 2789 } 2790 2791 } // Extern C 2792 2793 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2794 2795 // In most of the JVM thread support functions we need to access the 2796 // thread through a ThreadsListHandle to prevent it from exiting and 2797 // being reclaimed while we try to operate on it. The exceptions to this 2798 // rule are when operating on the current thread, or if the monitor of 2799 // the target java.lang.Thread is locked at the Java level - in both 2800 // cases the target cannot exit. 2801 2802 static void thread_entry(JavaThread* thread, TRAPS) { 2803 HandleMark hm(THREAD); 2804 Handle obj(THREAD, thread->threadObj()); 2805 JavaValue result(T_VOID); 2806 JavaCalls::call_virtual(&result, 2807 obj, 2808 SystemDictionary::Thread_klass(), 2809 vmSymbols::run_method_name(), 2810 vmSymbols::void_method_signature(), 2811 THREAD); 2812 } 2813 2814 2815 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2816 JVMWrapper("JVM_StartThread"); 2817 JavaThread *native_thread = NULL; 2818 2819 // We cannot hold the Threads_lock when we throw an exception, 2820 // due to rank ordering issues. Example: we might need to grab the 2821 // Heap_lock while we construct the exception. 2822 bool throw_illegal_thread_state = false; 2823 2824 // We must release the Threads_lock before we can post a jvmti event 2825 // in Thread::start. 2826 { 2827 // Ensure that the C++ Thread and OSThread structures aren't freed before 2828 // we operate. 2829 MutexLocker mu(Threads_lock); 2830 2831 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2832 // re-starting an already started thread, so we should usually find 2833 // that the JavaThread is null. However for a JNI attached thread 2834 // there is a small window between the Thread object being created 2835 // (with its JavaThread set) and the update to its threadStatus, so we 2836 // have to check for this 2837 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2838 throw_illegal_thread_state = true; 2839 } else { 2840 // We could also check the stillborn flag to see if this thread was already stopped, but 2841 // for historical reasons we let the thread detect that itself when it starts running 2842 2843 jlong size = 2844 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2845 // Allocate the C++ Thread structure and create the native thread. The 2846 // stack size retrieved from java is 64-bit signed, but the constructor takes 2847 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2848 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2849 // - Avoid passing negative values which would result in really large stacks. 2850 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2851 size_t sz = size > 0 ? (size_t) size : 0; 2852 native_thread = new JavaThread(&thread_entry, sz); 2853 2854 // At this point it may be possible that no osthread was created for the 2855 // JavaThread due to lack of memory. Check for this situation and throw 2856 // an exception if necessary. Eventually we may want to change this so 2857 // that we only grab the lock if the thread was created successfully - 2858 // then we can also do this check and throw the exception in the 2859 // JavaThread constructor. 2860 if (native_thread->osthread() != NULL) { 2861 // Note: the current thread is not being used within "prepare". 2862 native_thread->prepare(jthread); 2863 } 2864 } 2865 } 2866 2867 if (throw_illegal_thread_state) { 2868 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2869 } 2870 2871 assert(native_thread != NULL, "Starting null thread?"); 2872 2873 if (native_thread->osthread() == NULL) { 2874 // No one should hold a reference to the 'native_thread'. 2875 native_thread->smr_delete(); 2876 if (JvmtiExport::should_post_resource_exhausted()) { 2877 JvmtiExport::post_resource_exhausted( 2878 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2879 os::native_thread_creation_failed_msg()); 2880 } 2881 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2882 os::native_thread_creation_failed_msg()); 2883 } 2884 2885 Thread::start(native_thread); 2886 2887 JVM_END 2888 2889 2890 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2891 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2892 // but is thought to be reliable and simple. In the case, where the receiver is the 2893 // same thread as the sender, no VM_Operation is needed. 2894 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2895 JVMWrapper("JVM_StopThread"); 2896 2897 // A nested ThreadsListHandle will grab the Threads_lock so create 2898 // tlh before we resolve throwable. 2899 ThreadsListHandle tlh(thread); 2900 oop java_throwable = JNIHandles::resolve(throwable); 2901 if (java_throwable == NULL) { 2902 THROW(vmSymbols::java_lang_NullPointerException()); 2903 } 2904 oop java_thread = NULL; 2905 JavaThread* receiver = NULL; 2906 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2907 Events::log_exception(thread, 2908 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2909 p2i(receiver), p2i(java_thread), p2i(throwable)); 2910 2911 if (is_alive) { 2912 // jthread refers to a live JavaThread. 2913 if (thread == receiver) { 2914 // Exception is getting thrown at self so no VM_Operation needed. 2915 THROW_OOP(java_throwable); 2916 } else { 2917 // Use a VM_Operation to throw the exception. 2918 Thread::send_async_exception(java_thread, java_throwable); 2919 } 2920 } else { 2921 // Either: 2922 // - target thread has not been started before being stopped, or 2923 // - target thread already terminated 2924 // We could read the threadStatus to determine which case it is 2925 // but that is overkill as it doesn't matter. We must set the 2926 // stillborn flag for the first case, and if the thread has already 2927 // exited setting this flag has no effect. 2928 java_lang_Thread::set_stillborn(java_thread); 2929 } 2930 JVM_END 2931 2932 2933 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2934 JVMWrapper("JVM_IsThreadAlive"); 2935 2936 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2937 return java_lang_Thread::is_alive(thread_oop); 2938 JVM_END 2939 2940 2941 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2942 JVMWrapper("JVM_SuspendThread"); 2943 2944 ThreadsListHandle tlh(thread); 2945 JavaThread* receiver = NULL; 2946 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2947 if (is_alive) { 2948 // jthread refers to a live JavaThread. 2949 { 2950 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2951 if (receiver->is_external_suspend()) { 2952 // Don't allow nested external suspend requests. We can't return 2953 // an error from this interface so just ignore the problem. 2954 return; 2955 } 2956 if (receiver->is_exiting()) { // thread is in the process of exiting 2957 return; 2958 } 2959 receiver->set_external_suspend(); 2960 } 2961 2962 // java_suspend() will catch threads in the process of exiting 2963 // and will ignore them. 2964 receiver->java_suspend(); 2965 2966 // It would be nice to have the following assertion in all the 2967 // time, but it is possible for a racing resume request to have 2968 // resumed this thread right after we suspended it. Temporarily 2969 // enable this assertion if you are chasing a different kind of 2970 // bug. 2971 // 2972 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2973 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2974 } 2975 JVM_END 2976 2977 2978 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2979 JVMWrapper("JVM_ResumeThread"); 2980 2981 ThreadsListHandle tlh(thread); 2982 JavaThread* receiver = NULL; 2983 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2984 if (is_alive) { 2985 // jthread refers to a live JavaThread. 2986 2987 // This is the original comment for this Threads_lock grab: 2988 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2989 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2990 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2991 // looks at it. 2992 // 2993 // The above comment dates back to when we had both internal and 2994 // external suspend APIs that shared a common underlying mechanism. 2995 // External suspend is now entirely cooperative and doesn't share 2996 // anything with internal suspend. That said, there are some 2997 // assumptions in the VM that an external resume grabs the 2998 // Threads_lock. We can't drop the Threads_lock grab here until we 2999 // resolve the assumptions that exist elsewhere. 3000 // 3001 MutexLocker ml(Threads_lock); 3002 receiver->java_resume(); 3003 } 3004 JVM_END 3005 3006 3007 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3008 JVMWrapper("JVM_SetThreadPriority"); 3009 3010 ThreadsListHandle tlh(thread); 3011 oop java_thread = NULL; 3012 JavaThread* receiver = NULL; 3013 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3014 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3015 3016 if (is_alive) { 3017 // jthread refers to a live JavaThread. 3018 Thread::set_priority(receiver, (ThreadPriority)prio); 3019 } 3020 // Implied else: If the JavaThread hasn't started yet, then the 3021 // priority set in the java.lang.Thread object above will be pushed 3022 // down when it does start. 3023 JVM_END 3024 3025 3026 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3027 JVMWrapper("JVM_Yield"); 3028 if (os::dont_yield()) return; 3029 HOTSPOT_THREAD_YIELD(); 3030 os::naked_yield(); 3031 JVM_END 3032 3033 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) { 3034 assert(event != NULL, "invariant"); 3035 assert(event->should_commit(), "invariant"); 3036 event->set_time(millis); 3037 event->commit(); 3038 } 3039 3040 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3041 JVMWrapper("JVM_Sleep"); 3042 3043 if (millis < 0) { 3044 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3045 } 3046 3047 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3048 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3049 } 3050 3051 // Save current thread state and restore it at the end of this block. 3052 // And set new thread state to SLEEPING. 3053 JavaThreadSleepState jtss(thread); 3054 3055 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3056 EventThreadSleep event; 3057 3058 if (millis == 0) { 3059 os::naked_yield(); 3060 } else { 3061 ThreadState old_state = thread->osthread()->get_state(); 3062 thread->osthread()->set_state(SLEEPING); 3063 if (!thread->sleep(millis)) { // interrupted 3064 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3065 // us while we were sleeping. We do not overwrite those. 3066 if (!HAS_PENDING_EXCEPTION) { 3067 if (event.should_commit()) { 3068 post_thread_sleep_event(&event, millis); 3069 } 3070 HOTSPOT_THREAD_SLEEP_END(1); 3071 3072 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3073 // to properly restore the thread state. That's likely wrong. 3074 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3075 } 3076 } 3077 thread->osthread()->set_state(old_state); 3078 } 3079 if (event.should_commit()) { 3080 post_thread_sleep_event(&event, millis); 3081 } 3082 HOTSPOT_THREAD_SLEEP_END(0); 3083 JVM_END 3084 3085 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3086 JVMWrapper("JVM_CurrentThread"); 3087 oop jthread = thread->threadObj(); 3088 assert (thread != NULL, "no current thread!"); 3089 return JNIHandles::make_local(env, jthread); 3090 JVM_END 3091 3092 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3093 JVMWrapper("JVM_Interrupt"); 3094 3095 ThreadsListHandle tlh(thread); 3096 JavaThread* receiver = NULL; 3097 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3098 if (is_alive) { 3099 // jthread refers to a live JavaThread. 3100 receiver->interrupt(); 3101 } 3102 JVM_END 3103 3104 3105 // Return true iff the current thread has locked the object passed in 3106 3107 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3108 JVMWrapper("JVM_HoldsLock"); 3109 assert(THREAD->is_Java_thread(), "sanity check"); 3110 if (obj == NULL) { 3111 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3112 } 3113 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3114 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3115 JVM_END 3116 3117 3118 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3119 JVMWrapper("JVM_DumpAllStacks"); 3120 VM_PrintThreads op; 3121 VMThread::execute(&op); 3122 if (JvmtiExport::should_post_data_dump()) { 3123 JvmtiExport::post_data_dump(); 3124 } 3125 JVM_END 3126 3127 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3128 JVMWrapper("JVM_SetNativeThreadName"); 3129 3130 // We don't use a ThreadsListHandle here because the current thread 3131 // must be alive. 3132 oop java_thread = JNIHandles::resolve_non_null(jthread); 3133 JavaThread* thr = java_lang_Thread::thread(java_thread); 3134 if (thread == thr && !thr->has_attached_via_jni()) { 3135 // Thread naming is only supported for the current thread and 3136 // we don't set the name of an attached thread to avoid stepping 3137 // on other programs. 3138 ResourceMark rm(thread); 3139 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3140 os::set_native_thread_name(thread_name); 3141 } 3142 JVM_END 3143 3144 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3145 3146 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3147 JVMWrapper("JVM_GetClassContext"); 3148 ResourceMark rm(THREAD); 3149 JvmtiVMObjectAllocEventCollector oam; 3150 vframeStream vfst(thread); 3151 3152 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3153 // This must only be called from SecurityManager.getClassContext 3154 Method* m = vfst.method(); 3155 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3156 m->name() == vmSymbols::getClassContext_name() && 3157 m->signature() == vmSymbols::void_class_array_signature())) { 3158 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3159 } 3160 } 3161 3162 // Collect method holders 3163 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3164 for (; !vfst.at_end(); vfst.security_next()) { 3165 Method* m = vfst.method(); 3166 // Native frames are not returned 3167 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3168 Klass* holder = m->method_holder(); 3169 assert(holder->is_klass(), "just checking"); 3170 klass_array->append(holder); 3171 } 3172 } 3173 3174 // Create result array of type [Ljava/lang/Class; 3175 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3176 // Fill in mirrors corresponding to method holders 3177 for (int i = 0; i < klass_array->length(); i++) { 3178 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3179 } 3180 3181 return (jobjectArray) JNIHandles::make_local(env, result); 3182 JVM_END 3183 3184 3185 // java.lang.Package //////////////////////////////////////////////////////////////// 3186 3187 3188 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3189 JVMWrapper("JVM_GetSystemPackage"); 3190 ResourceMark rm(THREAD); 3191 JvmtiVMObjectAllocEventCollector oam; 3192 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3193 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3194 return (jstring) JNIHandles::make_local(result); 3195 JVM_END 3196 3197 3198 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3199 JVMWrapper("JVM_GetSystemPackages"); 3200 JvmtiVMObjectAllocEventCollector oam; 3201 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3202 return (jobjectArray) JNIHandles::make_local(result); 3203 JVM_END 3204 3205 3206 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3207 3208 3209 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3210 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3211 3212 MonitorLocker ml(Heap_lock); 3213 oop ref = Universe::reference_pending_list(); 3214 if (ref != NULL) { 3215 Universe::set_reference_pending_list(NULL); 3216 } 3217 return JNIHandles::make_local(env, ref); 3218 JVM_END 3219 3220 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3221 JVMWrapper("JVM_HasReferencePendingList"); 3222 MonitorLocker ml(Heap_lock); 3223 return Universe::has_reference_pending_list(); 3224 JVM_END 3225 3226 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3227 JVMWrapper("JVM_WaitForReferencePendingList"); 3228 MonitorLocker ml(Heap_lock); 3229 while (!Universe::has_reference_pending_list()) { 3230 ml.wait(); 3231 } 3232 JVM_END 3233 3234 3235 // ObjectInputStream /////////////////////////////////////////////////////////////// 3236 3237 // Return the first user-defined class loader up the execution stack, or null 3238 // if only code from the bootstrap or platform class loader is on the stack. 3239 3240 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3241 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3242 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3243 oop loader = vfst.method()->method_holder()->class_loader(); 3244 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3245 return JNIHandles::make_local(env, loader); 3246 } 3247 } 3248 return NULL; 3249 JVM_END 3250 3251 3252 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3253 3254 3255 // resolve array handle and check arguments 3256 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3257 if (arr == NULL) { 3258 THROW_0(vmSymbols::java_lang_NullPointerException()); 3259 } 3260 oop a = JNIHandles::resolve_non_null(arr); 3261 if (!a->is_array()) { 3262 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3263 } else if (type_array_only && !a->is_typeArray()) { 3264 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3265 } 3266 return arrayOop(a); 3267 } 3268 3269 3270 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3271 JVMWrapper("JVM_GetArrayLength"); 3272 arrayOop a = check_array(env, arr, false, CHECK_0); 3273 return a->length(); 3274 JVM_END 3275 3276 3277 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3278 JVMWrapper("JVM_Array_Get"); 3279 JvmtiVMObjectAllocEventCollector oam; 3280 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3281 jvalue value; 3282 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3283 oop box = Reflection::box(&value, type, CHECK_NULL); 3284 return JNIHandles::make_local(env, box); 3285 JVM_END 3286 3287 3288 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3289 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3290 jvalue value; 3291 value.i = 0; // to initialize value before getting used in CHECK 3292 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3293 assert(a->is_typeArray(), "just checking"); 3294 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3295 BasicType wide_type = (BasicType) wCode; 3296 if (type != wide_type) { 3297 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3298 } 3299 return value; 3300 JVM_END 3301 3302 3303 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3304 JVMWrapper("JVM_SetArrayElement"); 3305 arrayOop a = check_array(env, arr, false, CHECK); 3306 oop box = JNIHandles::resolve(val); 3307 jvalue value; 3308 value.i = 0; // to initialize value before getting used in CHECK 3309 BasicType value_type; 3310 if (a->is_objArray()) { 3311 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3312 value_type = Reflection::unbox_for_regular_object(box, &value); 3313 } else { 3314 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3315 } 3316 Reflection::array_set(&value, a, index, value_type, CHECK); 3317 JVM_END 3318 3319 3320 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3321 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3322 arrayOop a = check_array(env, arr, true, CHECK); 3323 assert(a->is_typeArray(), "just checking"); 3324 BasicType value_type = (BasicType) vCode; 3325 Reflection::array_set(&v, a, index, value_type, CHECK); 3326 JVM_END 3327 3328 3329 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3330 JVMWrapper("JVM_NewArray"); 3331 JvmtiVMObjectAllocEventCollector oam; 3332 oop element_mirror = JNIHandles::resolve(eltClass); 3333 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3334 return JNIHandles::make_local(env, result); 3335 JVM_END 3336 3337 3338 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3339 JVMWrapper("JVM_NewMultiArray"); 3340 JvmtiVMObjectAllocEventCollector oam; 3341 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3342 oop element_mirror = JNIHandles::resolve(eltClass); 3343 assert(dim_array->is_typeArray(), "just checking"); 3344 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3345 return JNIHandles::make_local(env, result); 3346 JVM_END 3347 3348 3349 // Library support /////////////////////////////////////////////////////////////////////////// 3350 3351 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3352 //%note jvm_ct 3353 JVMWrapper("JVM_LoadLibrary"); 3354 char ebuf[1024]; 3355 void *load_result; 3356 { 3357 ThreadToNativeFromVM ttnfvm(thread); 3358 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3359 } 3360 if (load_result == NULL) { 3361 char msg[1024]; 3362 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3363 // Since 'ebuf' may contain a string encoded using 3364 // platform encoding scheme, we need to pass 3365 // Exceptions::unsafe_to_utf8 to the new_exception method 3366 // as the last argument. See bug 6367357. 3367 Handle h_exception = 3368 Exceptions::new_exception(thread, 3369 vmSymbols::java_lang_UnsatisfiedLinkError(), 3370 msg, Exceptions::unsafe_to_utf8); 3371 3372 THROW_HANDLE_0(h_exception); 3373 } 3374 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3375 return load_result; 3376 JVM_END 3377 3378 3379 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3380 JVMWrapper("JVM_UnloadLibrary"); 3381 os::dll_unload(handle); 3382 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3383 JVM_END 3384 3385 3386 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3387 JVMWrapper("JVM_FindLibraryEntry"); 3388 void* find_result = os::dll_lookup(handle, name); 3389 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3390 find_result != NULL ? "Found" : "Failed to find", 3391 name, p2i(handle)); 3392 return find_result; 3393 JVM_END 3394 3395 3396 // JNI version /////////////////////////////////////////////////////////////////////////////// 3397 3398 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3399 JVMWrapper("JVM_IsSupportedJNIVersion"); 3400 return Threads::is_supported_jni_version_including_1_1(version); 3401 JVM_END 3402 3403 3404 // String support /////////////////////////////////////////////////////////////////////////// 3405 3406 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3407 JVMWrapper("JVM_InternString"); 3408 JvmtiVMObjectAllocEventCollector oam; 3409 if (str == NULL) return NULL; 3410 oop string = JNIHandles::resolve_non_null(str); 3411 oop result = StringTable::intern(string, CHECK_NULL); 3412 return (jstring) JNIHandles::make_local(env, result); 3413 JVM_END 3414 3415 3416 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3417 3418 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3419 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3420 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3421 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3422 // nature. JavaThreads will be "in native" when using this API from JDK code. 3423 3424 3425 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3426 VM_Exit::block_if_vm_exited(); 3427 JVMWrapper("JVM_RawMonitorCreate"); 3428 return new os::PlatformMutex(); 3429 } 3430 3431 3432 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3433 VM_Exit::block_if_vm_exited(); 3434 JVMWrapper("JVM_RawMonitorDestroy"); 3435 delete ((os::PlatformMutex*) mon); 3436 } 3437 3438 3439 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3440 VM_Exit::block_if_vm_exited(); 3441 JVMWrapper("JVM_RawMonitorEnter"); 3442 ((os::PlatformMutex*) mon)->lock(); 3443 return 0; 3444 } 3445 3446 3447 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3448 VM_Exit::block_if_vm_exited(); 3449 JVMWrapper("JVM_RawMonitorExit"); 3450 ((os::PlatformMutex*) mon)->unlock(); 3451 } 3452 3453 3454 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3455 3456 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3457 Handle loader, Handle protection_domain, 3458 jboolean throwError, TRAPS) { 3459 // Security Note: 3460 // The Java level wrapper will perform the necessary security check allowing 3461 // us to pass the NULL as the initiating class loader. The VM is responsible for 3462 // the checkPackageAccess relative to the initiating class loader via the 3463 // protection_domain. The protection_domain is passed as NULL by the java code 3464 // if there is no security manager in 3-arg Class.forName(). 3465 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3466 3467 // Check if we should initialize the class 3468 if (init && klass->is_instance_klass()) { 3469 klass->initialize(CHECK_NULL); 3470 } 3471 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3472 } 3473 3474 3475 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3476 3477 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3478 JVMWrapper("JVM_InvokeMethod"); 3479 Handle method_handle; 3480 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3481 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3482 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3483 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3484 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3485 jobject res = JNIHandles::make_local(env, result); 3486 if (JvmtiExport::should_post_vm_object_alloc()) { 3487 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3488 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3489 if (java_lang_Class::is_primitive(ret_type)) { 3490 // Only for primitive type vm allocates memory for java object. 3491 // See box() method. 3492 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3493 } 3494 } 3495 return res; 3496 } else { 3497 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3498 } 3499 JVM_END 3500 3501 3502 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3503 JVMWrapper("JVM_NewInstanceFromConstructor"); 3504 oop constructor_mirror = JNIHandles::resolve(c); 3505 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3506 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3507 jobject res = JNIHandles::make_local(env, result); 3508 if (JvmtiExport::should_post_vm_object_alloc()) { 3509 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3510 } 3511 return res; 3512 JVM_END 3513 3514 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3515 3516 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3517 JVMWrapper("JVM_SupportsCX8"); 3518 return VM_Version::supports_cx8(); 3519 JVM_END 3520 3521 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3522 JVMWrapper("JVM_InitializeFromArchive"); 3523 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3524 assert(k->is_klass(), "just checking"); 3525 HeapShared::initialize_from_archived_subgraph(k); 3526 JVM_END 3527 3528 // Returns an array of all live Thread objects (VM internal JavaThreads, 3529 // jvmti agent threads, and JNI attaching threads are skipped) 3530 // See CR 6404306 regarding JNI attaching threads 3531 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3532 ResourceMark rm(THREAD); 3533 ThreadsListEnumerator tle(THREAD, false, false); 3534 JvmtiVMObjectAllocEventCollector oam; 3535 3536 int num_threads = tle.num_threads(); 3537 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3538 objArrayHandle threads_ah(THREAD, r); 3539 3540 for (int i = 0; i < num_threads; i++) { 3541 Handle h = tle.get_threadObj(i); 3542 threads_ah->obj_at_put(i, h()); 3543 } 3544 3545 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3546 JVM_END 3547 3548 3549 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3550 // Return StackTraceElement[][], each element is the stack trace of a thread in 3551 // the corresponding entry in the given threads array 3552 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3553 JVMWrapper("JVM_DumpThreads"); 3554 JvmtiVMObjectAllocEventCollector oam; 3555 3556 // Check if threads is null 3557 if (threads == NULL) { 3558 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3559 } 3560 3561 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3562 objArrayHandle ah(THREAD, a); 3563 int num_threads = ah->length(); 3564 // check if threads is non-empty array 3565 if (num_threads == 0) { 3566 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3567 } 3568 3569 // check if threads is not an array of objects of Thread class 3570 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3571 if (k != SystemDictionary::Thread_klass()) { 3572 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3573 } 3574 3575 ResourceMark rm(THREAD); 3576 3577 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3578 for (int i = 0; i < num_threads; i++) { 3579 oop thread_obj = ah->obj_at(i); 3580 instanceHandle h(THREAD, (instanceOop) thread_obj); 3581 thread_handle_array->append(h); 3582 } 3583 3584 // The JavaThread references in thread_handle_array are validated 3585 // in VM_ThreadDump::doit(). 3586 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3587 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3588 3589 JVM_END 3590 3591 // JVM monitoring and management support 3592 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3593 return Management::get_jmm_interface(version); 3594 JVM_END 3595 3596 // com.sun.tools.attach.VirtualMachine agent properties support 3597 // 3598 // Initialize the agent properties with the properties maintained in the VM 3599 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3600 JVMWrapper("JVM_InitAgentProperties"); 3601 ResourceMark rm; 3602 3603 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3604 3605 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3606 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3607 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3608 return properties; 3609 JVM_END 3610 3611 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3612 { 3613 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3614 JvmtiVMObjectAllocEventCollector oam; 3615 3616 if (ofClass == NULL) { 3617 return NULL; 3618 } 3619 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3620 // Special handling for primitive objects 3621 if (java_lang_Class::is_primitive(mirror())) { 3622 return NULL; 3623 } 3624 Klass* k = java_lang_Class::as_Klass(mirror()); 3625 if (!k->is_instance_klass()) { 3626 return NULL; 3627 } 3628 InstanceKlass* ik = InstanceKlass::cast(k); 3629 int encl_method_class_idx = ik->enclosing_method_class_index(); 3630 if (encl_method_class_idx == 0) { 3631 return NULL; 3632 } 3633 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3634 objArrayHandle dest(THREAD, dest_o); 3635 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3636 dest->obj_at_put(0, enc_k->java_mirror()); 3637 int encl_method_method_idx = ik->enclosing_method_method_index(); 3638 if (encl_method_method_idx != 0) { 3639 Symbol* sym = ik->constants()->symbol_at( 3640 extract_low_short_from_int( 3641 ik->constants()->name_and_type_at(encl_method_method_idx))); 3642 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3643 dest->obj_at_put(1, str()); 3644 sym = ik->constants()->symbol_at( 3645 extract_high_short_from_int( 3646 ik->constants()->name_and_type_at(encl_method_method_idx))); 3647 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3648 dest->obj_at_put(2, str()); 3649 } 3650 return (jobjectArray) JNIHandles::make_local(dest()); 3651 } 3652 JVM_END 3653 3654 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3655 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3656 ResourceMark rm(THREAD); 3657 3658 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3659 return NULL; 3660 } 3661 3662 char** vm_flags = Arguments::jvm_flags_array(); 3663 char** vm_args = Arguments::jvm_args_array(); 3664 int num_flags = Arguments::num_jvm_flags(); 3665 int num_args = Arguments::num_jvm_args(); 3666 3667 InstanceKlass* ik = SystemDictionary::String_klass(); 3668 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3669 objArrayHandle result_h(THREAD, r); 3670 3671 int index = 0; 3672 for (int j = 0; j < num_flags; j++, index++) { 3673 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3674 result_h->obj_at_put(index, h()); 3675 } 3676 for (int i = 0; i < num_args; i++, index++) { 3677 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3678 result_h->obj_at_put(index, h()); 3679 } 3680 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3681 JVM_END 3682 3683 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3684 return os::get_signal_number(name); 3685 JVM_END