1 /* 2 * Copyright (c) 1997, 2022, 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 "cds/classListParser.hpp" 27 #include "cds/classListWriter.hpp" 28 #include "cds/dynamicArchive.hpp" 29 #include "cds/heapShared.hpp" 30 #include "cds/lambdaFormInvokers.hpp" 31 #include "classfile/classFileStream.hpp" 32 #include "classfile/classLoader.inline.hpp" 33 #include "classfile/classLoaderData.hpp" 34 #include "classfile/classLoaderData.inline.hpp" 35 #include "classfile/classLoadInfo.hpp" 36 #include "classfile/javaAssertions.hpp" 37 #include "classfile/javaClasses.inline.hpp" 38 #include "classfile/moduleEntry.hpp" 39 #include "classfile/modules.hpp" 40 #include "classfile/packageEntry.hpp" 41 #include "classfile/stringTable.hpp" 42 #include "classfile/symbolTable.hpp" 43 #include "classfile/systemDictionary.hpp" 44 #include "classfile/vmClasses.hpp" 45 #include "classfile/vmSymbols.hpp" 46 #include "gc/shared/collectedHeap.inline.hpp" 47 #include "interpreter/bytecode.hpp" 48 #include "interpreter/bytecodeUtils.hpp" 49 #include "jfr/jfrEvents.hpp" 50 #include "jvm.h" 51 #include "logging/log.hpp" 52 #include "memory/oopFactory.hpp" 53 #include "memory/referenceType.hpp" 54 #include "memory/resourceArea.hpp" 55 #include "memory/universe.hpp" 56 #include "oops/access.inline.hpp" 57 #include "oops/constantPool.hpp" 58 #include "oops/fieldStreams.inline.hpp" 59 #include "oops/flatArrayKlass.hpp" 60 #include "oops/instanceKlass.hpp" 61 #include "oops/klass.inline.hpp" 62 #include "oops/method.hpp" 63 #include "oops/recordComponent.hpp" 64 #include "oops/objArrayKlass.hpp" 65 #include "oops/objArrayOop.inline.hpp" 66 #include "oops/oop.inline.hpp" 67 #include "prims/jvm_misc.hpp" 68 #include "prims/jvmtiExport.hpp" 69 #include "prims/jvmtiThreadState.inline.hpp" 70 #include "prims/stackwalk.hpp" 71 #include "runtime/arguments.hpp" 72 #include "runtime/atomic.hpp" 73 #include "runtime/continuation.hpp" 74 #include "runtime/globals_extension.hpp" 75 #include "runtime/handles.inline.hpp" 76 #include "runtime/init.hpp" 77 #include "runtime/interfaceSupport.inline.hpp" 78 #include "runtime/deoptimization.hpp" 79 #include "runtime/handshake.hpp" 80 #include "runtime/java.hpp" 81 #include "runtime/javaCalls.hpp" 82 #include "runtime/javaThread.hpp" 83 #include "runtime/jfieldIDWorkaround.hpp" 84 #include "runtime/jniHandles.inline.hpp" 85 #include "runtime/os.inline.hpp" 86 #include "runtime/osThread.hpp" 87 #include "runtime/perfData.hpp" 88 #include "runtime/reflection.hpp" 89 #include "runtime/synchronizer.hpp" 90 #include "runtime/threadIdentifier.hpp" 91 #include "runtime/threadSMR.hpp" 92 #include "runtime/vframe.inline.hpp" 93 #include "runtime/vmOperations.hpp" 94 #include "runtime/vm_version.hpp" 95 #include "services/attachListener.hpp" 96 #include "services/management.hpp" 97 #include "services/threadService.hpp" 98 #include "utilities/copy.hpp" 99 #include "utilities/defaultStream.hpp" 100 #include "utilities/dtrace.hpp" 101 #include "utilities/events.hpp" 102 #include "utilities/macros.hpp" 103 #include "utilities/utf8.hpp" 104 #if INCLUDE_CDS 105 #include "classfile/systemDictionaryShared.hpp" 106 #endif 107 #if INCLUDE_JFR 108 #include "jfr/jfr.hpp" 109 #endif 110 #if INCLUDE_MANAGEMENT 111 #include "services/finalizerService.hpp" 112 #endif 113 114 #include <errno.h> 115 116 /* 117 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 118 such ctors and calls MUST NOT come between an oop declaration/init and its 119 usage because if objects are move this may cause various memory stomps, bus 120 errors and segfaults. Here is a cookbook for causing so called "naked oop 121 failures": 122 123 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 124 // Object address to be held directly in mirror & not visible to GC 125 oop mirror = JNIHandles::resolve_non_null(ofClass); 126 127 // If this ctor can hit a safepoint, moving objects around, then 128 ComplexConstructor foo; 129 130 // Boom! mirror may point to JUNK instead of the intended object 131 (some dereference of mirror) 132 133 // Here's another call that may block for GC, making mirror stale 134 MutexLocker ml(some_lock); 135 136 // And here's an initializer that can result in a stale oop 137 // all in one step. 138 oop o = call_that_can_throw_exception(TRAPS); 139 140 141 The solution is to keep the oop declaration BELOW the ctor or function 142 call that might cause a GC, do another resolve to reassign the oop, or 143 consider use of a Handle instead of an oop so there is immunity from object 144 motion. But note that the "QUICK" entries below do not have a handlemark 145 and thus can only support use of handles passed in. 146 */ 147 148 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 149 ResourceMark rm; 150 int line_number = -1; 151 const char * source_file = NULL; 152 const char * trace = "explicit"; 153 InstanceKlass* caller = NULL; 154 JavaThread* jthread = THREAD; 155 if (jthread->has_last_Java_frame()) { 156 vframeStream vfst(jthread); 157 158 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 159 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController"); 160 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 161 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction"); 162 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 163 164 Method* last_caller = NULL; 165 166 while (!vfst.at_end()) { 167 Method* m = vfst.method(); 168 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&& 169 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 170 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 171 break; 172 } 173 last_caller = m; 174 vfst.next(); 175 } 176 // if this is called from Class.forName0 and that is called from Class.forName, 177 // then print the caller of Class.forName. If this is Class.loadClass, then print 178 // that caller, otherwise keep quiet since this should be picked up elsewhere. 179 bool found_it = false; 180 if (!vfst.at_end() && 181 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 182 vfst.method()->name() == vmSymbols::forName0_name()) { 183 vfst.next(); 184 if (!vfst.at_end() && 185 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 186 vfst.method()->name() == vmSymbols::forName_name()) { 187 vfst.next(); 188 found_it = true; 189 } 190 } else if (last_caller != NULL && 191 last_caller->method_holder()->name() == 192 vmSymbols::java_lang_ClassLoader() && 193 last_caller->name() == vmSymbols::loadClass_name()) { 194 found_it = true; 195 } else if (!vfst.at_end()) { 196 if (vfst.method()->is_native()) { 197 // JNI call 198 found_it = true; 199 } 200 } 201 if (found_it && !vfst.at_end()) { 202 // found the caller 203 caller = vfst.method()->method_holder(); 204 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 205 if (line_number == -1) { 206 // show method name if it's a native method 207 trace = vfst.method()->name_and_sig_as_C_string(); 208 } 209 Symbol* s = caller->source_file_name(); 210 if (s != NULL) { 211 source_file = s->as_C_string(); 212 } 213 } 214 } 215 if (caller != NULL) { 216 if (to_class != caller) { 217 const char * from = caller->external_name(); 218 const char * to = to_class->external_name(); 219 // print in a single call to reduce interleaving between threads 220 if (source_file != NULL) { 221 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 222 } else { 223 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 224 } 225 } 226 } 227 } 228 229 void trace_class_resolution(Klass* to_class) { 230 EXCEPTION_MARK; 231 trace_class_resolution_impl(to_class, THREAD); 232 if (HAS_PENDING_EXCEPTION) { 233 CLEAR_PENDING_EXCEPTION; 234 } 235 } 236 237 // java.lang.System ////////////////////////////////////////////////////////////////////// 238 239 240 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 241 return os::javaTimeMillis(); 242 JVM_END 243 244 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 245 return os::javaTimeNanos(); 246 JVM_END 247 248 // The function below is actually exposed by jdk.internal.misc.VM and not 249 // java.lang.System, but we choose to keep it here so that it stays next 250 // to JVM_CurrentTimeMillis and JVM_NanoTime 251 252 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 253 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 254 255 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 256 jlong seconds; 257 jlong nanos; 258 259 os::javaTimeSystemUTC(seconds, nanos); 260 261 // We're going to verify that the result can fit in a long. 262 // For that we need the difference in seconds between 'seconds' 263 // and 'offset_secs' to be such that: 264 // |seconds - offset_secs| < (2^63/10^9) 265 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 266 // which makes |seconds - offset_secs| < 2^33 267 // and we will prefer +/- 2^32 as the maximum acceptable diff 268 // as 2^32 has a more natural feel than 2^33... 269 // 270 // So if |seconds - offset_secs| >= 2^32 - we return a special 271 // sentinel value (-1) which the caller should take as an 272 // exception value indicating that the offset given to us is 273 // too far from range of the current time - leading to too big 274 // a nano adjustment. The caller is expected to recover by 275 // computing a more accurate offset and calling this method 276 // again. (For the record 2^32 secs is ~136 years, so that 277 // should rarely happen) 278 // 279 jlong diff = seconds - offset_secs; 280 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 281 return -1; // sentinel value: the offset is too far off the target 282 } 283 284 // return the adjustment. If you compute a time by adding 285 // this number of nanoseconds along with the number of seconds 286 // in the offset you should get the current UTC time. 287 return (diff * (jlong)1000000000) + nanos; 288 JVM_END 289 290 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 291 jobject dst, jint dst_pos, jint length)) 292 // Check if we have null pointers 293 if (src == NULL || dst == NULL) { 294 THROW(vmSymbols::java_lang_NullPointerException()); 295 } 296 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 297 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 298 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 299 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 300 // Do copy 301 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 302 JVM_END 303 304 305 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 306 JavaValue r(T_OBJECT); 307 // public synchronized Object put(Object key, Object value); 308 HandleMark hm(THREAD); 309 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 310 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 311 JavaCalls::call_virtual(&r, 312 props, 313 vmClasses::Properties_klass(), 314 vmSymbols::put_name(), 315 vmSymbols::object_object_object_signature(), 316 key_str, 317 value_str, 318 THREAD); 319 } 320 321 322 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 323 324 /* 325 * Return all of the system properties in a Java String array with alternating 326 * names and values from the jvm SystemProperty. 327 * Which includes some internal and all commandline -D defined properties. 328 */ 329 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 330 ResourceMark rm(THREAD); 331 HandleMark hm(THREAD); 332 int ndx = 0; 333 int fixedCount = 2; 334 335 SystemProperty* p = Arguments::system_properties(); 336 int count = Arguments::PropertyList_count(p); 337 338 // Allocate result String array 339 InstanceKlass* ik = vmClasses::String_klass(); 340 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 341 objArrayHandle result_h(THREAD, r); 342 343 while (p != NULL) { 344 const char * key = p->key(); 345 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 346 const char * value = p->value(); 347 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 348 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL); 349 result_h->obj_at_put(ndx * 2, key_str()); 350 result_h->obj_at_put(ndx * 2 + 1, value_str()); 351 ndx++; 352 } 353 p = p->next(); 354 } 355 356 // Convert the -XX:MaxDirectMemorySize= command line flag 357 // to the sun.nio.MaxDirectMemorySize property. 358 // Do this after setting user properties to prevent people 359 // from setting the value with a -D option, as requested. 360 // Leave empty if not supplied 361 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 362 char as_chars[256]; 363 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 364 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 365 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 366 result_h->obj_at_put(ndx * 2, key_str()); 367 result_h->obj_at_put(ndx * 2 + 1, value_str()); 368 ndx++; 369 } 370 371 // JVM monitoring and management support 372 // Add the sun.management.compiler property for the compiler's name 373 { 374 #undef CSIZE 375 #if defined(_LP64) || defined(_WIN64) 376 #define CSIZE "64-Bit " 377 #else 378 #define CSIZE 379 #endif // 64bit 380 381 #if COMPILER1_AND_COMPILER2 382 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 383 #else 384 #if defined(COMPILER1) 385 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 386 #elif defined(COMPILER2) 387 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 388 #elif INCLUDE_JVMCI 389 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2" 390 #else 391 const char* compiler_name = ""; 392 #endif // compilers 393 #endif // COMPILER1_AND_COMPILER2 394 395 if (*compiler_name != '\0' && 396 (Arguments::mode() != Arguments::_int)) { 397 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 398 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 399 result_h->obj_at_put(ndx * 2, key_str()); 400 result_h->obj_at_put(ndx * 2 + 1, value_str()); 401 ndx++; 402 } 403 } 404 405 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 406 JVM_END 407 408 409 /* 410 * Return the temporary directory that the VM uses for the attach 411 * and perf data files. 412 * 413 * It is important that this directory is well-known and the 414 * same for all VM instances. It cannot be affected by configuration 415 * variables such as java.io.tmpdir. 416 */ 417 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 418 HandleMark hm(THREAD); 419 const char* temp_dir = os::get_temp_directory(); 420 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 421 return (jstring) JNIHandles::make_local(THREAD, h()); 422 JVM_END 423 424 425 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 426 427 extern volatile jint vm_created; 428 429 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 430 #if INCLUDE_CDS 431 // Link all classes for dynamic CDS dumping before vm exit. 432 if (DynamicArchive::should_dump_at_vm_exit()) { 433 DynamicArchive::prepare_for_dump_at_exit(); 434 } 435 #endif 436 EventShutdown event; 437 if (event.should_commit()) { 438 event.set_reason("Shutdown requested from Java"); 439 event.commit(); 440 } 441 JVM_END 442 443 444 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 445 before_exit(thread, true); 446 vm_exit(code); 447 JVM_END 448 449 450 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 451 if (!DisableExplicitGC) { 452 EventSystemGC event; 453 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent); 454 Universe::heap()->collect(GCCause::_java_lang_system_gc); 455 event.commit(); 456 } 457 JVM_END 458 459 460 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 461 return Universe::heap()->millis_since_last_whole_heap_examined(); 462 JVM_END 463 464 465 static inline jlong convert_size_t_to_jlong(size_t val) { 466 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 467 NOT_LP64 (return (jlong)val;) 468 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 469 } 470 471 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 472 size_t n = Universe::heap()->capacity(); 473 return convert_size_t_to_jlong(n); 474 JVM_END 475 476 477 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 478 size_t n = Universe::heap()->unused(); 479 return convert_size_t_to_jlong(n); 480 JVM_END 481 482 483 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 484 size_t n = Universe::heap()->max_capacity(); 485 return convert_size_t_to_jlong(n); 486 JVM_END 487 488 489 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 490 return os::active_processor_count(); 491 JVM_END 492 493 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void)) 494 #ifdef LINUX 495 if (UseContainerSupport) { 496 return JNI_TRUE; 497 } 498 #endif 499 return JNI_FALSE; 500 JVM_END 501 502 // java.lang.Throwable ////////////////////////////////////////////////////// 503 504 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 505 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 506 java_lang_Throwable::fill_in_stack_trace(exception); 507 JVM_END 508 509 // java.lang.NullPointerException /////////////////////////////////////////// 510 511 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 512 if (!ShowCodeDetailsInExceptionMessages) return NULL; 513 514 oop exc = JNIHandles::resolve_non_null(throwable); 515 516 Method* method; 517 int bci; 518 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 519 return NULL; 520 } 521 if (method->is_native()) { 522 return NULL; 523 } 524 525 stringStream ss; 526 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 527 if (ok) { 528 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 529 return (jstring) JNIHandles::make_local(THREAD, result); 530 } else { 531 return NULL; 532 } 533 JVM_END 534 535 // java.lang.StackTraceElement ////////////////////////////////////////////// 536 537 538 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth)) 539 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace)); 540 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 541 objArrayHandle stack_trace(THREAD, st); 542 // Fill in the allocated stack trace 543 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK); 544 JVM_END 545 546 547 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 548 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 549 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 550 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 551 JVM_END 552 553 554 // java.lang.StackWalker ////////////////////////////////////////////////////// 555 556 557 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 558 jint skip_frames, jobject contScope, jobject cont, 559 jint frame_count, jint start_index, jobjectArray frames)) 560 if (!thread->has_last_Java_frame()) { 561 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 562 } 563 564 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 565 Handle contScope_h(THREAD, JNIHandles::resolve(contScope)); 566 Handle cont_h(THREAD, JNIHandles::resolve(cont)); 567 // frames array is a Class<?>[] array when only getting caller reference, 568 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 569 // be null. 570 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 571 objArrayHandle frames_array_h(THREAD, fa); 572 573 int limit = start_index + frame_count; 574 if (frames_array_h->length() < limit) { 575 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 576 } 577 578 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h, 579 frame_count, start_index, frames_array_h, CHECK_NULL); 580 return JNIHandles::make_local(THREAD, result); 581 JVM_END 582 583 584 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 585 jint frame_count, jint start_index, 586 jobjectArray frames)) 587 // frames array is a Class<?>[] array when only getting caller reference, 588 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 589 // be null. 590 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 591 objArrayHandle frames_array_h(THREAD, fa); 592 593 int limit = start_index+frame_count; 594 if (frames_array_h->length() < limit) { 595 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 596 } 597 598 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 599 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 600 start_index, frames_array_h, THREAD); 601 JVM_END 602 603 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont)) 604 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 605 objArrayHandle frames_array_h(THREAD, fa); 606 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 607 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont)); 608 609 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD); 610 JVM_END 611 612 // java.lang.Object /////////////////////////////////////////////// 613 614 615 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 616 // as implemented in the classic virtual machine; return 0 if object is NULL 617 if (handle == NULL) { 618 return 0; 619 } 620 oop obj = JNIHandles::resolve_non_null(handle); 621 if (EnableValhalla && obj->klass()->is_inline_klass()) { 622 JavaValue result(T_INT); 623 JavaCallArguments args; 624 Handle ho(THREAD, obj); 625 args.push_oop(ho); 626 methodHandle method(THREAD, Universe::value_object_hash_code_method()); 627 JavaCalls::call(&result, method, &args, THREAD); 628 if (HAS_PENDING_EXCEPTION) { 629 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) { 630 Handle e(THREAD, PENDING_EXCEPTION); 631 CLEAR_PENDING_EXCEPTION; 632 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false); 633 } 634 } 635 return result.get_jint(); 636 } else { 637 return ObjectSynchronizer::FastHashCode(THREAD, obj); 638 } 639 JVM_END 640 641 642 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 643 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 644 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 645 if (JvmtiExport::should_post_monitor_wait()) { 646 JvmtiExport::post_monitor_wait(thread, obj(), ms); 647 648 // The current thread already owns the monitor and it has not yet 649 // been added to the wait queue so the current thread cannot be 650 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 651 // event handler cannot accidentally consume an unpark() meant for 652 // the ParkEvent associated with this ObjectMonitor. 653 } 654 ObjectSynchronizer::wait(obj, ms, CHECK); 655 JVM_END 656 657 658 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 659 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 660 ObjectSynchronizer::notify(obj, CHECK); 661 JVM_END 662 663 664 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 665 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 666 ObjectSynchronizer::notifyall(obj, CHECK); 667 JVM_END 668 669 670 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 671 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 672 Klass* klass = obj->klass(); 673 JvmtiVMObjectAllocEventCollector oam; 674 675 #ifdef ASSERT 676 // Just checking that the cloneable flag is set correct 677 if (obj->is_array()) { 678 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 679 } else { 680 guarantee(obj->is_instance(), "should be instanceOop"); 681 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 682 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 683 } 684 #endif 685 686 // Check if class of obj supports the Cloneable interface. 687 // All arrays are considered to be cloneable (See JLS 20.1.5). 688 // All j.l.r.Reference classes are considered non-cloneable. 689 if (!klass->is_cloneable() || 690 klass->is_inline_klass() || 691 (klass->is_instance_klass() && 692 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 693 ResourceMark rm(THREAD); 694 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 695 } 696 697 // Make shallow object copy 698 const size_t size = obj->size(); 699 oop new_obj_oop = NULL; 700 if (obj->is_array()) { 701 const int length = ((arrayOop)obj())->length(); 702 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 703 /* do_zero */ true, CHECK_NULL); 704 } else { 705 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 706 } 707 708 HeapAccess<>::clone(obj(), new_obj_oop, size); 709 710 Handle new_obj(THREAD, new_obj_oop); 711 // Caution: this involves a java upcall, so the clone should be 712 // "gc-robust" by this stage. 713 if (klass->has_finalizer()) { 714 assert(obj->is_instance(), "should be instanceOop"); 715 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 716 new_obj = Handle(THREAD, new_obj_oop); 717 } 718 719 return JNIHandles::make_local(THREAD, new_obj()); 720 JVM_END 721 722 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 723 724 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 725 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 726 JVM_END 727 728 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 729 return InstanceKlass::is_finalization_enabled(); 730 JVM_END 731 732 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 733 734 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 735 CONT_RegisterNativeMethods(env, cls); 736 JVM_END 737 738 // java.io.File /////////////////////////////////////////////////////////////// 739 740 JVM_LEAF(char*, JVM_NativePath(char* path)) 741 return os::native_path(path); 742 JVM_END 743 744 745 // Misc. class handling /////////////////////////////////////////////////////////// 746 747 748 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 749 // Getting the class of the caller frame. 750 // 751 // The call stack at this point looks something like this: 752 // 753 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 754 // [1] [ @CallerSensitive API.method ] 755 // [.] [ (skipped intermediate frames) ] 756 // [n] [ caller ] 757 vframeStream vfst(thread); 758 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 759 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 760 Method* m = vfst.method(); 761 assert(m != NULL, "sanity"); 762 switch (n) { 763 case 0: 764 // This must only be called from Reflection.getCallerClass 765 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 766 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 767 } 768 // fall-through 769 case 1: 770 // Frame 0 and 1 must be caller sensitive. 771 if (!m->caller_sensitive()) { 772 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 773 } 774 break; 775 default: 776 if (!m->is_ignored_by_security_stack_walk()) { 777 // We have reached the desired frame; return the holder class. 778 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 779 } 780 break; 781 } 782 } 783 return NULL; 784 JVM_END 785 786 787 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 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(THREAD, 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 // Java libraries should ensure that name is never null or illegal. 807 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 808 // It's impossible to create this class; the name cannot fit 809 // into the constant pool. 810 return NULL; 811 } 812 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name"); 813 814 TempNewSymbol h_name = SymbolTable::new_symbol(name); 815 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 816 if (k == NULL) { 817 return NULL; 818 } 819 820 if (log_is_enabled(Debug, class, resolve)) { 821 trace_class_resolution(k); 822 } 823 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 824 JVM_END 825 826 // Find a class with this name in this loader, using the caller's protection domain. 827 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 828 jboolean init, jobject loader, 829 jclass caller)) 830 TempNewSymbol h_name = 831 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 832 CHECK_NULL); 833 834 oop loader_oop = JNIHandles::resolve(loader); 835 oop from_class = JNIHandles::resolve(caller); 836 oop protection_domain = NULL; 837 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 838 // NPE. Put it in another way, the bootstrap class loader has all permission and 839 // thus no checkPackageAccess equivalence in the VM class loader. 840 // The caller is also passed as NULL by the java code if there is no security 841 // manager to avoid the performance cost of getting the calling class. 842 if (from_class != NULL && loader_oop != NULL) { 843 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 844 } 845 846 Handle h_loader(THREAD, loader_oop); 847 Handle h_prot(THREAD, protection_domain); 848 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 849 h_prot, false, THREAD); 850 851 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 852 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 853 } 854 return result; 855 JVM_END 856 857 // Currently only called from the old verifier. 858 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 859 jboolean init, jclass from)) 860 TempNewSymbol h_name = 861 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 862 CHECK_NULL); 863 oop from_class_oop = JNIHandles::resolve(from); 864 Klass* from_class = (from_class_oop == NULL) 865 ? (Klass*)NULL 866 : java_lang_Class::as_Klass(from_class_oop); 867 oop class_loader = NULL; 868 oop protection_domain = NULL; 869 if (from_class != NULL) { 870 class_loader = from_class->class_loader(); 871 protection_domain = from_class->protection_domain(); 872 } 873 Handle h_loader(THREAD, class_loader); 874 Handle h_prot (THREAD, protection_domain); 875 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 876 h_prot, true, thread); 877 878 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 879 // this function is generally only used for class loading during verification. 880 ResourceMark rm; 881 oop from_mirror = JNIHandles::resolve_non_null(from); 882 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 883 const char * from_name = from_class->external_name(); 884 885 oop mirror = JNIHandles::resolve_non_null(result); 886 Klass* to_class = java_lang_Class::as_Klass(mirror); 887 const char * to = to_class->external_name(); 888 log_debug(class, resolve)("%s %s (verification)", from_name, to); 889 } 890 891 return result; 892 JVM_END 893 894 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 895 static jclass jvm_define_class_common(const char *name, 896 jobject loader, const jbyte *buf, 897 jsize len, jobject pd, const char *source, 898 TRAPS) { 899 if (source == NULL) source = "__JVM_DefineClass__"; 900 901 JavaThread* jt = THREAD; 902 903 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 904 ClassLoader::perf_define_appclass_selftime(), 905 ClassLoader::perf_define_appclasses(), 906 jt->get_thread_stat()->perf_recursion_counts_addr(), 907 jt->get_thread_stat()->perf_timers_addr(), 908 PerfClassTraceTime::DEFINE_CLASS); 909 910 if (UsePerfData) { 911 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 912 } 913 914 // Class resolution will get the class name from the .class stream if the name is null. 915 TempNewSymbol class_name = name == NULL ? NULL : 916 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 917 CHECK_NULL); 918 919 ResourceMark rm(THREAD); 920 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 921 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 922 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 923 ClassLoadInfo cl_info(protection_domain); 924 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 925 class_loader, 926 cl_info, 927 CHECK_NULL); 928 929 if (log_is_enabled(Debug, class, resolve)) { 930 trace_class_resolution(k); 931 } 932 933 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 934 } 935 936 enum { 937 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 938 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 939 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 940 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 941 }; 942 943 /* 944 * Define a class with the specified flags that indicates if it's a nestmate, 945 * hidden, or strongly referenced from class loader. 946 */ 947 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 948 const jbyte *buf, jsize len, jobject pd, 949 jboolean init, int flags, jobject classData, TRAPS) { 950 ResourceMark rm(THREAD); 951 952 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup)); 953 // Lookup class must be a non-null instance 954 if (lookup_k == NULL) { 955 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 956 } 957 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass"); 958 959 Handle class_loader (THREAD, lookup_k->class_loader()); 960 961 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 962 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 963 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 964 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 965 966 InstanceKlass* host_class = NULL; 967 if (is_nestmate) { 968 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL); 969 } 970 971 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 972 name, 973 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 974 is_nestmate ? host_class->external_name() : "", 975 is_hidden ? "hidden" : "not hidden", 976 is_strong ? "strong" : "weak", 977 vm_annotations ? "with vm annotations" : "without vm annotation"); 978 979 if (!is_hidden) { 980 // classData is only applicable for hidden classes 981 if (classData != NULL) { 982 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 983 } 984 if (is_nestmate) { 985 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 986 } 987 if (!is_strong) { 988 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 989 } 990 if (vm_annotations) { 991 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 992 } 993 if (flags != STRONG_LOADER_LINK) { 994 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 995 err_msg("invalid flag 0x%x", flags)); 996 } 997 } 998 999 // Class resolution will get the class name from the .class stream if the name is null. 1000 TempNewSymbol class_name = name == NULL ? NULL : 1001 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1002 CHECK_NULL); 1003 1004 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1005 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1006 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 1007 1008 InstanceKlass* ik = NULL; 1009 if (!is_hidden) { 1010 ClassLoadInfo cl_info(protection_domain); 1011 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1012 class_loader, 1013 cl_info, 1014 CHECK_NULL); 1015 1016 if (log_is_enabled(Debug, class, resolve)) { 1017 trace_class_resolution(ik); 1018 } 1019 } else { // hidden 1020 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1021 ClassLoadInfo cl_info(protection_domain, 1022 host_class, 1023 classData_h, 1024 is_hidden, 1025 is_strong, 1026 vm_annotations); 1027 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1028 class_loader, 1029 cl_info, 1030 CHECK_NULL); 1031 1032 // The hidden class loader data has been artificially been kept alive to 1033 // this point. The mirror and any instances of this class have to keep 1034 // it alive afterwards. 1035 ik->class_loader_data()->dec_keep_alive(); 1036 1037 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1038 ModuleEntry* module = ik->module(); 1039 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1040 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1041 module_name, 1042 ik->external_name(), 1043 host_class->external_name(), 1044 ik->is_hidden() ? "is hidden" : "is not hidden"); 1045 } 1046 } 1047 assert(Reflection::is_same_class_package(lookup_k, ik), 1048 "lookup class and defined class are in different packages"); 1049 1050 if (init) { 1051 ik->initialize(CHECK_NULL); 1052 } else { 1053 ik->link_class(CHECK_NULL); 1054 } 1055 1056 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1057 } 1058 1059 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1060 return jvm_define_class_common(name, loader, buf, len, pd, NULL, THREAD); 1061 JVM_END 1062 1063 /* 1064 * Define a class with the specified lookup class. 1065 * lookup: Lookup class 1066 * name: the name of the class 1067 * buf: class bytes 1068 * len: length of class bytes 1069 * pd: protection domain 1070 * init: initialize the class 1071 * flags: properties of the class 1072 * classData: private static pre-initialized field 1073 */ 1074 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1075 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1076 1077 if (lookup == NULL) { 1078 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1079 } 1080 1081 assert(buf != NULL, "buf must not be NULL"); 1082 1083 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1084 JVM_END 1085 1086 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1087 1088 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1089 JVM_END 1090 1091 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1092 ResourceMark rm(THREAD); 1093 1094 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1095 char* str = java_lang_String::as_utf8_string(h_name()); 1096 1097 // Sanity check, don't expect null 1098 if (str == NULL) return NULL; 1099 1100 // Internalize the string, converting '.' to '/' in string. 1101 char* p = (char*)str; 1102 while (*p != '\0') { 1103 if (*p == '.') { 1104 *p = '/'; 1105 } 1106 p++; 1107 } 1108 1109 const int str_len = (int)(p - str); 1110 if (str_len > Symbol::max_length()) { 1111 // It's impossible to create this class; the name cannot fit 1112 // into the constant pool. 1113 return NULL; 1114 } 1115 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1116 1117 // Security Note: 1118 // The Java level wrapper will perform the necessary security check allowing 1119 // us to pass the NULL as the initiating class loader. 1120 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1121 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, 1122 h_loader, 1123 Handle()); 1124 #if INCLUDE_CDS 1125 if (k == NULL) { 1126 // If the class is not already loaded, try to see if it's in the shared 1127 // archive for the current classloader (h_loader). 1128 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1129 } 1130 #endif 1131 return (k == NULL) ? NULL : 1132 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1133 JVM_END 1134 1135 // Module support ////////////////////////////////////////////////////////////////////////////// 1136 1137 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1138 jstring location, jobjectArray packages)) 1139 Handle h_module (THREAD, JNIHandles::resolve(module)); 1140 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1141 JVM_END 1142 1143 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1144 Handle h_module (THREAD, JNIHandles::resolve(module)); 1145 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1146 JVM_END 1147 1148 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1149 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1150 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1151 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1152 JVM_END 1153 1154 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1155 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1156 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1157 JVM_END 1158 1159 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1160 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1161 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1162 JVM_END 1163 1164 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1165 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1166 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1167 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1168 JVM_END 1169 1170 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1171 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1172 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1173 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1174 JVM_END 1175 1176 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1177 1178 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1179 assert (cls != NULL, "illegal class"); 1180 JvmtiVMObjectAllocEventCollector oam; 1181 ResourceMark rm(THREAD); 1182 HandleMark hm(THREAD); 1183 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1184 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1185 return (jstring) JNIHandles::make_local(THREAD, result); 1186 JVM_END 1187 1188 1189 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1190 JvmtiVMObjectAllocEventCollector oam; 1191 oop mirror = JNIHandles::resolve_non_null(cls); 1192 1193 // Special handling for primitive objects 1194 if (java_lang_Class::is_primitive(mirror)) { 1195 // Primitive objects does not have any interfaces 1196 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1197 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1198 } 1199 1200 Klass* klass = java_lang_Class::as_Klass(mirror); 1201 // Figure size of result array 1202 int size; 1203 if (klass->is_instance_klass()) { 1204 InstanceKlass* ik = InstanceKlass::cast(klass); 1205 size = ik->local_interfaces()->length(); 1206 } else { 1207 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass"); 1208 size = 2; 1209 } 1210 1211 // Allocate result array 1212 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1213 objArrayHandle result (THREAD, r); 1214 // Fill in result 1215 if (klass->is_instance_klass()) { 1216 // Regular instance klass, fill in all local interfaces 1217 for (int index = 0; index < size; index++) { 1218 InstanceKlass* ik = InstanceKlass::cast(klass); 1219 Klass* k = ik->local_interfaces()->at(index); 1220 result->obj_at_put(index, k->java_mirror()); 1221 } 1222 } else { 1223 // All arrays implement java.lang.Cloneable and java.io.Serializable 1224 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1225 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1226 } 1227 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1228 JVM_END 1229 1230 1231 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1232 oop mirror = JNIHandles::resolve_non_null(cls); 1233 if (java_lang_Class::is_primitive(mirror)) { 1234 return JNI_FALSE; 1235 } 1236 Klass* k = java_lang_Class::as_Klass(mirror); 1237 jboolean result = k->is_interface(); 1238 assert(!result || k->is_instance_klass(), 1239 "all interfaces are instance types"); 1240 // The compiler intrinsic for isInterface tests the 1241 // Klass::_access_flags bits in the same way. 1242 return result; 1243 JVM_END 1244 1245 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1246 oop mirror = JNIHandles::resolve_non_null(cls); 1247 if (java_lang_Class::is_primitive(mirror)) { 1248 return JNI_FALSE; 1249 } 1250 Klass* k = java_lang_Class::as_Klass(mirror); 1251 return k->is_hidden(); 1252 JVM_END 1253 1254 JVM_ENTRY(jboolean, JVM_IsIdentityClass(JNIEnv *env, jclass cls)) 1255 oop mirror = JNIHandles::resolve_non_null(cls); 1256 if (java_lang_Class::is_primitive(mirror)) { 1257 return JNI_FALSE; 1258 } 1259 Klass* k = java_lang_Class::as_Klass(mirror); 1260 if (EnableValhalla) { 1261 return k->is_array_klass() || k->is_identity_class(); 1262 } else { 1263 return k->is_interface() ? JNI_FALSE : JNI_TRUE; 1264 } 1265 JVM_END 1266 1267 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1268 JvmtiVMObjectAllocEventCollector oam; 1269 oop mirror = JNIHandles::resolve_non_null(cls); 1270 if (java_lang_Class::is_primitive(mirror)) { 1271 // There are no signers for primitive types 1272 return NULL; 1273 } 1274 1275 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror)); 1276 1277 // If there are no signers set in the class, or if the class 1278 // is an array, return NULL. 1279 if (signers == NULL) return NULL; 1280 1281 // copy of the signers array 1282 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1283 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1284 for (int index = 0; index < signers->length(); index++) { 1285 signers_copy->obj_at_put(index, signers->obj_at(index)); 1286 } 1287 1288 // return the copy 1289 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy); 1290 JVM_END 1291 1292 1293 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1294 oop mirror = JNIHandles::resolve_non_null(cls); 1295 if (!java_lang_Class::is_primitive(mirror)) { 1296 // This call is ignored for primitive types and arrays. 1297 // Signers are only set once, ClassLoader.java, and thus shouldn't 1298 // be called with an array. Only the bootstrap loader creates arrays. 1299 Klass* k = java_lang_Class::as_Klass(mirror); 1300 if (k->is_instance_klass()) { 1301 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1302 } 1303 } 1304 JVM_END 1305 1306 1307 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1308 oop mirror = JNIHandles::resolve_non_null(cls); 1309 if (mirror == NULL) { 1310 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1311 } 1312 1313 if (java_lang_Class::is_primitive(mirror)) { 1314 // Primitive types does not have a protection domain. 1315 return NULL; 1316 } 1317 1318 oop pd = java_lang_Class::protection_domain(mirror); 1319 return (jobject) JNIHandles::make_local(THREAD, pd); 1320 JVM_END 1321 1322 1323 // Returns the inherited_access_control_context field of the running thread. 1324 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1325 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1326 return JNIHandles::make_local(THREAD, result); 1327 JVM_END 1328 1329 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1330 if (!UsePrivilegedStack) return NULL; 1331 1332 ResourceMark rm(THREAD); 1333 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1334 JvmtiVMObjectAllocEventCollector oam; 1335 1336 // count the protection domains on the execution stack. We collapse 1337 // duplicate consecutive protection domains into a single one, as 1338 // well as stopping when we hit a privileged frame. 1339 1340 oop previous_protection_domain = NULL; 1341 Handle privileged_context(thread, NULL); 1342 bool is_privileged = false; 1343 oop protection_domain = NULL; 1344 1345 // Iterate through Java frames 1346 vframeStream vfst(thread); 1347 for(; !vfst.at_end(); vfst.next()) { 1348 // get method of frame 1349 Method* method = vfst.method(); 1350 1351 // stop at the first privileged frame 1352 if (method->method_holder() == vmClasses::AccessController_klass() && 1353 method->name() == vmSymbols::executePrivileged_name()) 1354 { 1355 // this frame is privileged 1356 is_privileged = true; 1357 1358 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1359 1360 StackValueCollection* locals = priv->locals(); 1361 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1362 StackValue* clr_sv = locals->at(2); // Class<?> caller 1363 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1364 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1365 privileged_context = ctx_sv->get_obj(); 1366 Handle caller = clr_sv->get_obj(); 1367 1368 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1369 protection_domain = caller_klass->protection_domain(); 1370 } else { 1371 protection_domain = method->method_holder()->protection_domain(); 1372 } 1373 1374 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1375 local_array->push(Handle(thread, protection_domain)); 1376 previous_protection_domain = protection_domain; 1377 } 1378 1379 if (is_privileged) break; 1380 } 1381 1382 1383 // either all the domains on the stack were system domains, or 1384 // we had a privileged system domain 1385 if (local_array->is_empty()) { 1386 if (is_privileged && privileged_context.is_null()) return NULL; 1387 1388 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1389 return JNIHandles::make_local(THREAD, result); 1390 } 1391 1392 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(), 1393 local_array->length(), CHECK_NULL); 1394 objArrayHandle h_context(thread, context); 1395 for (int index = 0; index < local_array->length(); index++) { 1396 h_context->obj_at_put(index, local_array->at(index)()); 1397 } 1398 1399 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1400 1401 return JNIHandles::make_local(THREAD, result); 1402 JVM_END 1403 1404 class ScopedValueBindingsResolver { 1405 public: 1406 InstanceKlass* Carrier_klass; 1407 ScopedValueBindingsResolver(JavaThread* THREAD) { 1408 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_incubator_concurrent_ScopedValue_Carrier(), true, THREAD); 1409 Carrier_klass = InstanceKlass::cast(k); 1410 } 1411 }; 1412 1413 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1414 ResourceMark rm(THREAD); 1415 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1416 JvmtiVMObjectAllocEventCollector oam; 1417 1418 static ScopedValueBindingsResolver resolver(THREAD); 1419 1420 // Iterate through Java frames 1421 vframeStream vfst(thread); 1422 for(; !vfst.at_end(); vfst.next()) { 1423 int loc = -1; 1424 // get method of frame 1425 Method* method = vfst.method(); 1426 1427 Symbol *name = method->name(); 1428 1429 InstanceKlass* holder = method->method_holder(); 1430 if (name == vmSymbols::runWith_method_name()) { 1431 if ((holder == resolver.Carrier_klass 1432 || holder == vmClasses::VirtualThread_klass() 1433 || holder == vmClasses::Thread_klass())) { 1434 loc = 1; 1435 } 1436 } 1437 1438 if (loc != -1) { 1439 javaVFrame *frame = vfst.asJavaVFrame(); 1440 StackValueCollection* locals = frame->locals(); 1441 StackValue* head_sv = locals->at(loc); // jdk/incubator/concurrent/ScopedValue$Snapshot 1442 Handle result = head_sv->get_obj(); 1443 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1444 if (result() != NULL) { 1445 return JNIHandles::make_local(THREAD, result()); 1446 } 1447 } 1448 } 1449 1450 return NULL; 1451 JVM_END 1452 1453 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1454 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1455 return (k != NULL) && k->is_array_klass() ? true : false; 1456 JVM_END 1457 1458 1459 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1460 oop mirror = JNIHandles::resolve_non_null(cls); 1461 return (jboolean) java_lang_Class::is_primitive(mirror); 1462 JVM_END 1463 1464 1465 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1466 oop mirror = JNIHandles::resolve_non_null(cls); 1467 if (java_lang_Class::is_primitive(mirror)) { 1468 // Primitive type 1469 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1470 } 1471 1472 Klass* k = java_lang_Class::as_Klass(mirror); 1473 debug_only(int computed_modifiers = k->compute_modifier_flags()); 1474 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1475 return k->modifier_flags(); 1476 JVM_END 1477 1478 1479 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1480 1481 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1482 JvmtiVMObjectAllocEventCollector oam; 1483 // ofClass is a reference to a java_lang_Class object. The mirror object 1484 // of an InstanceKlass 1485 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1486 if (java_lang_Class::is_primitive(ofMirror) || 1487 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1488 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1489 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1490 } 1491 1492 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1493 InnerClassesIterator iter(k); 1494 1495 if (iter.length() == 0) { 1496 // Neither an inner nor outer class 1497 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1498 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1499 } 1500 1501 // find inner class info 1502 constantPoolHandle cp(thread, k->constants()); 1503 int length = iter.length(); 1504 1505 // Allocate temp. result array 1506 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL); 1507 objArrayHandle result (THREAD, r); 1508 int members = 0; 1509 1510 for (; !iter.done(); iter.next()) { 1511 int ioff = iter.inner_class_info_index(); 1512 int ooff = iter.outer_class_info_index(); 1513 1514 if (ioff != 0 && ooff != 0) { 1515 // Check to see if the name matches the class we're looking for 1516 // before attempting to find the class. 1517 if (cp->klass_name_at_matches(k, ooff)) { 1518 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1519 if (outer_klass == k) { 1520 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1521 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1522 1523 // Throws an exception if outer klass has not declared k as 1524 // an inner klass 1525 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1526 1527 result->obj_at_put(members, inner_klass->java_mirror()); 1528 members++; 1529 } 1530 } 1531 } 1532 } 1533 1534 if (members != length) { 1535 // Return array of right length 1536 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL); 1537 for(int i = 0; i < members; i++) { 1538 res->obj_at_put(i, result->obj_at(i)); 1539 } 1540 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1541 } 1542 1543 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1544 JVM_END 1545 1546 1547 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1548 { 1549 // ofClass is a reference to a java_lang_Class object. 1550 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1551 if (java_lang_Class::is_primitive(ofMirror)) { 1552 return NULL; 1553 } 1554 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1555 if (!klass->is_instance_klass()) { 1556 return NULL; 1557 } 1558 1559 bool inner_is_member = false; 1560 Klass* outer_klass 1561 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1562 if (outer_klass == NULL) return NULL; // already a top-level class 1563 if (!inner_is_member) return NULL; // a hidden class (inside a method) 1564 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1565 } 1566 JVM_END 1567 1568 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1569 { 1570 oop mirror = JNIHandles::resolve_non_null(cls); 1571 if (java_lang_Class::is_primitive(mirror)) { 1572 return NULL; 1573 } 1574 Klass* klass = java_lang_Class::as_Klass(mirror); 1575 if (!klass->is_instance_klass()) { 1576 return NULL; 1577 } 1578 InstanceKlass* k = InstanceKlass::cast(klass); 1579 int ooff = 0, noff = 0; 1580 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1581 if (noff != 0) { 1582 constantPoolHandle i_cp(thread, k->constants()); 1583 Symbol* name = i_cp->symbol_at(noff); 1584 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1585 return (jstring) JNIHandles::make_local(THREAD, str()); 1586 } 1587 } 1588 return NULL; 1589 } 1590 JVM_END 1591 1592 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1593 assert (cls != NULL, "illegal class"); 1594 JvmtiVMObjectAllocEventCollector oam; 1595 ResourceMark rm(THREAD); 1596 oop mirror = JNIHandles::resolve_non_null(cls); 1597 // Return null for arrays and primitives 1598 if (!java_lang_Class::is_primitive(mirror)) { 1599 Klass* k = java_lang_Class::as_Klass(mirror); 1600 if (k->is_instance_klass()) { 1601 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1602 if (sym == NULL) return NULL; 1603 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1604 return (jstring) JNIHandles::make_local(THREAD, str()); 1605 } 1606 } 1607 return NULL; 1608 JVM_END 1609 1610 1611 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1612 assert (cls != NULL, "illegal class"); 1613 oop mirror = JNIHandles::resolve_non_null(cls); 1614 // Return null for arrays and primitives 1615 if (!java_lang_Class::is_primitive(mirror)) { 1616 Klass* k = java_lang_Class::as_Klass(mirror); 1617 if (k->is_instance_klass()) { 1618 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1619 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1620 } 1621 } 1622 return NULL; 1623 JVM_END 1624 1625 1626 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1627 // some of this code was adapted from from jni_FromReflectedField 1628 1629 oop reflected = JNIHandles::resolve_non_null(field); 1630 oop mirror = java_lang_reflect_Field::clazz(reflected); 1631 Klass* k = java_lang_Class::as_Klass(mirror); 1632 int slot = java_lang_reflect_Field::slot(reflected); 1633 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1634 1635 InstanceKlass* ik = InstanceKlass::cast(k); 1636 intptr_t offset = ik->field_offset(slot); 1637 1638 if (modifiers & JVM_ACC_STATIC) { 1639 // for static fields we only look in the current class 1640 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1641 assert(false, "cannot find static field"); 1642 return false; 1643 } 1644 } else { 1645 // for instance fields we start with the current class and work 1646 // our way up through the superclass chain 1647 if (!ik->find_field_from_offset(offset, false, &fd)) { 1648 assert(false, "cannot find instance field"); 1649 return false; 1650 } 1651 } 1652 return true; 1653 } 1654 1655 static Method* jvm_get_method_common(jobject method) { 1656 // some of this code was adapted from from jni_FromReflectedMethod 1657 1658 oop reflected = JNIHandles::resolve_non_null(method); 1659 oop mirror = NULL; 1660 int slot = 0; 1661 1662 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1663 mirror = java_lang_reflect_Constructor::clazz(reflected); 1664 slot = java_lang_reflect_Constructor::slot(reflected); 1665 } else { 1666 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1667 "wrong type"); 1668 mirror = java_lang_reflect_Method::clazz(reflected); 1669 slot = java_lang_reflect_Method::slot(reflected); 1670 } 1671 Klass* k = java_lang_Class::as_Klass(mirror); 1672 1673 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1674 assert(m != NULL, "cannot find method"); 1675 return m; // caller has to deal with NULL in product mode 1676 } 1677 1678 /* Type use annotations support (JDK 1.8) */ 1679 1680 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1681 assert (cls != NULL, "illegal class"); 1682 ResourceMark rm(THREAD); 1683 // Return null for arrays and primitives 1684 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1685 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1686 if (k->is_instance_klass()) { 1687 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1688 if (type_annotations != NULL) { 1689 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1690 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1691 } 1692 } 1693 } 1694 return NULL; 1695 JVM_END 1696 1697 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1698 assert (method != NULL, "illegal method"); 1699 // method is a handle to a java.lang.reflect.Method object 1700 Method* m = jvm_get_method_common(method); 1701 if (m == NULL) { 1702 return NULL; 1703 } 1704 1705 AnnotationArray* type_annotations = m->type_annotations(); 1706 if (type_annotations != NULL) { 1707 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1708 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1709 } 1710 1711 return NULL; 1712 JVM_END 1713 1714 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1715 assert (field != NULL, "illegal field"); 1716 fieldDescriptor fd; 1717 bool gotFd = jvm_get_field_common(field, fd); 1718 if (!gotFd) { 1719 return NULL; 1720 } 1721 1722 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1723 JVM_END 1724 1725 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1726 if (!cp->is_within_bounds(index)) { 1727 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1728 } 1729 } 1730 1731 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1732 { 1733 // method is a handle to a java.lang.reflect.Method object 1734 Method* method_ptr = jvm_get_method_common(method); 1735 methodHandle mh (THREAD, method_ptr); 1736 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1737 const int num_params = mh->method_parameters_length(); 1738 1739 if (num_params < 0) { 1740 // A -1 return value from method_parameters_length means there is no 1741 // parameter data. Return null to indicate this to the reflection 1742 // API. 1743 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1744 return (jobjectArray)NULL; 1745 } else { 1746 // Otherwise, we return something up to reflection, even if it is 1747 // a zero-length array. Why? Because in some cases this can 1748 // trigger a MalformedParametersException. 1749 1750 // make sure all the symbols are properly formatted 1751 for (int i = 0; i < num_params; i++) { 1752 MethodParametersElement* params = mh->method_parameters_start(); 1753 int index = params[i].name_cp_index; 1754 constantPoolHandle cp(THREAD, mh->constants()); 1755 bounds_check(cp, index, CHECK_NULL); 1756 1757 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1758 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1759 "Wrong type at constant pool index"); 1760 } 1761 1762 } 1763 1764 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1765 objArrayHandle result (THREAD, result_oop); 1766 1767 for (int i = 0; i < num_params; i++) { 1768 MethodParametersElement* params = mh->method_parameters_start(); 1769 // For a 0 index, give a NULL symbol 1770 Symbol* sym = 0 != params[i].name_cp_index ? 1771 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1772 int flags = params[i].flags; 1773 oop param = Reflection::new_parameter(reflected_method, i, sym, 1774 flags, CHECK_NULL); 1775 result->obj_at_put(i, param); 1776 } 1777 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1778 } 1779 } 1780 JVM_END 1781 1782 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1783 1784 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1785 { 1786 JvmtiVMObjectAllocEventCollector oam; 1787 1788 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1789 // Exclude primitive types and array types 1790 if (java_lang_Class::is_primitive(ofMirror) || 1791 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1792 // Return empty array 1793 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1794 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1795 } 1796 1797 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1798 constantPoolHandle cp(THREAD, k->constants()); 1799 1800 // Ensure class is linked 1801 k->link_class(CHECK_NULL); 1802 1803 // Allocate result 1804 int num_fields; 1805 1806 if (publicOnly) { 1807 num_fields = 0; 1808 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1809 if (fs.access_flags().is_public()) ++num_fields; 1810 } 1811 } else { 1812 num_fields = k->java_fields_count(); 1813 } 1814 1815 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1816 objArrayHandle result (THREAD, r); 1817 1818 int out_idx = 0; 1819 fieldDescriptor fd; 1820 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1821 if (!publicOnly || fs.access_flags().is_public()) { 1822 fd.reinitialize(k, fs.index()); 1823 oop field = Reflection::new_field(&fd, CHECK_NULL); 1824 result->obj_at_put(out_idx, field); 1825 ++out_idx; 1826 } 1827 } 1828 assert(out_idx == num_fields, "just checking"); 1829 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1830 } 1831 JVM_END 1832 1833 // A class is a record if and only if it is final and a direct subclass of 1834 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1835 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1836 { 1837 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1838 if (k != NULL && k->is_instance_klass()) { 1839 InstanceKlass* ik = InstanceKlass::cast(k); 1840 return ik->is_record(); 1841 } else { 1842 return false; 1843 } 1844 } 1845 JVM_END 1846 1847 // Returns an array containing the components of the Record attribute, 1848 // or NULL if the attribute is not present. 1849 // 1850 // Note that this function returns the components of the Record attribute 1851 // even if the class is not a record. 1852 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1853 { 1854 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1855 assert(c->is_instance_klass(), "must be"); 1856 InstanceKlass* ik = InstanceKlass::cast(c); 1857 1858 Array<RecordComponent*>* components = ik->record_components(); 1859 if (components != NULL) { 1860 JvmtiVMObjectAllocEventCollector oam; 1861 constantPoolHandle cp(THREAD, ik->constants()); 1862 int length = components->length(); 1863 assert(length >= 0, "unexpected record_components length"); 1864 objArrayOop record_components = 1865 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1866 objArrayHandle components_h (THREAD, record_components); 1867 1868 for (int x = 0; x < length; x++) { 1869 RecordComponent* component = components->at(x); 1870 assert(component != NULL, "unexpected NULL record component"); 1871 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1872 components_h->obj_at_put(x, component_oop); 1873 } 1874 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1875 } 1876 1877 return NULL; 1878 } 1879 JVM_END 1880 1881 static bool select_method(const methodHandle& method, bool want_constructor) { 1882 bool is_ctor = (method->is_object_constructor() || 1883 method->is_static_vnew_factory()); 1884 if (want_constructor) { 1885 return is_ctor; 1886 } else { 1887 return (!is_ctor && 1888 !method->is_class_initializer() && 1889 !method->is_overpass()); 1890 } 1891 } 1892 1893 static jobjectArray get_class_declared_methods_helper( 1894 JNIEnv *env, 1895 jclass ofClass, jboolean publicOnly, 1896 bool want_constructor, 1897 Klass* klass, TRAPS) { 1898 1899 JvmtiVMObjectAllocEventCollector oam; 1900 1901 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1902 // Exclude primitive types and array types 1903 if (java_lang_Class::is_primitive(ofMirror) 1904 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1905 // Return empty array 1906 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1907 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1908 } 1909 1910 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1911 1912 // Ensure class is linked 1913 k->link_class(CHECK_NULL); 1914 1915 Array<Method*>* methods = k->methods(); 1916 int methods_length = methods->length(); 1917 1918 // Save original method_idnum in case of redefinition, which can change 1919 // the idnum of obsolete methods. The new method will have the same idnum 1920 // but if we refresh the methods array, the counts will be wrong. 1921 ResourceMark rm(THREAD); 1922 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1923 int num_methods = 0; 1924 1925 for (int i = 0; i < methods_length; i++) { 1926 methodHandle method(THREAD, methods->at(i)); 1927 if (select_method(method, want_constructor)) { 1928 if (!publicOnly || method->is_public()) { 1929 idnums->push(method->method_idnum()); 1930 ++num_methods; 1931 } 1932 } 1933 } 1934 1935 // Allocate result 1936 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1937 objArrayHandle result (THREAD, r); 1938 1939 // Now just put the methods that we selected above, but go by their idnum 1940 // in case of redefinition. The methods can be redefined at any safepoint, 1941 // so above when allocating the oop array and below when creating reflect 1942 // objects. 1943 for (int i = 0; i < num_methods; i++) { 1944 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1945 if (method.is_null()) { 1946 // Method may have been deleted and seems this API can handle null 1947 // Otherwise should probably put a method that throws NSME 1948 result->obj_at_put(i, NULL); 1949 } else { 1950 oop m; 1951 if (want_constructor) { 1952 assert(method->is_object_constructor() || 1953 method->is_static_vnew_factory(), "must be"); 1954 m = Reflection::new_constructor(method, CHECK_NULL); 1955 } else { 1956 m = Reflection::new_method(method, false, CHECK_NULL); 1957 } 1958 result->obj_at_put(i, m); 1959 } 1960 } 1961 1962 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1963 } 1964 1965 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1966 { 1967 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1968 /*want_constructor*/ false, 1969 vmClasses::reflect_Method_klass(), THREAD); 1970 } 1971 JVM_END 1972 1973 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1974 { 1975 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1976 /*want_constructor*/ true, 1977 vmClasses::reflect_Constructor_klass(), THREAD); 1978 } 1979 JVM_END 1980 1981 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1982 { 1983 oop mirror = JNIHandles::resolve_non_null(cls); 1984 if (java_lang_Class::is_primitive(mirror)) { 1985 // Primitive type 1986 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1987 } 1988 1989 Klass* k = java_lang_Class::as_Klass(mirror); 1990 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1991 } 1992 JVM_END 1993 1994 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1995 { 1996 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1997 assert(c->is_instance_klass(), "must be"); 1998 InstanceKlass* ck = InstanceKlass::cast(c); 1999 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 2000 assert(m->is_instance_klass(), "must be"); 2001 InstanceKlass* mk = InstanceKlass::cast(m); 2002 return ck->has_nestmate_access_to(mk, THREAD); 2003 } 2004 JVM_END 2005 2006 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 2007 { 2008 // current is not a primitive or array class 2009 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2010 assert(c->is_instance_klass(), "must be"); 2011 InstanceKlass* ck = InstanceKlass::cast(c); 2012 InstanceKlass* host = ck->nest_host(THREAD); 2013 return (jclass) (host == NULL ? NULL : 2014 JNIHandles::make_local(THREAD, host->java_mirror())); 2015 } 2016 JVM_END 2017 2018 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 2019 { 2020 // current is not a primitive or array class 2021 ResourceMark rm(THREAD); 2022 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2023 assert(c->is_instance_klass(), "must be"); 2024 InstanceKlass* ck = InstanceKlass::cast(c); 2025 InstanceKlass* host = ck->nest_host(THREAD); 2026 2027 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 2028 ck->external_name(), host->external_name()); 2029 { 2030 JvmtiVMObjectAllocEventCollector oam; 2031 Array<u2>* members = host->nest_members(); 2032 int length = members == NULL ? 0 : members->length(); 2033 2034 log_trace(class, nestmates)(" - host has %d listed nest members", length); 2035 2036 // nest host is first in the array so make it one bigger 2037 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2038 length + 1, CHECK_NULL); 2039 objArrayHandle result(THREAD, r); 2040 result->obj_at_put(0, host->java_mirror()); 2041 if (length != 0) { 2042 int count = 0; 2043 for (int i = 0; i < length; i++) { 2044 int cp_index = members->at(i); 2045 Klass* k = host->constants()->klass_at(cp_index, THREAD); 2046 if (HAS_PENDING_EXCEPTION) { 2047 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2048 return NULL; // propagate VMEs 2049 } 2050 if (log_is_enabled(Trace, class, nestmates)) { 2051 stringStream ss; 2052 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2053 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2054 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2055 log_trace(class, nestmates)("%s", ss.as_string()); 2056 } 2057 CLEAR_PENDING_EXCEPTION; 2058 continue; 2059 } 2060 if (k->is_instance_klass()) { 2061 InstanceKlass* ik = InstanceKlass::cast(k); 2062 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2063 if (nest_host_k == host) { 2064 result->obj_at_put(count+1, k->java_mirror()); 2065 count++; 2066 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2067 } else { 2068 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2069 ik->external_name(), nest_host_k->external_name()); 2070 } 2071 } else { 2072 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2073 k->external_name()); 2074 } 2075 } 2076 if (count < length) { 2077 // we had invalid entries so we need to compact the array 2078 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2079 length + 1, count + 1); 2080 2081 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2082 count + 1, CHECK_NULL); 2083 objArrayHandle result2(THREAD, r2); 2084 for (int i = 0; i < count + 1; i++) { 2085 result2->obj_at_put(i, result->obj_at(i)); 2086 } 2087 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2088 } 2089 } 2090 else { 2091 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate"); 2092 } 2093 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2094 } 2095 } 2096 JVM_END 2097 2098 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2099 { 2100 oop mirror = JNIHandles::resolve_non_null(current); 2101 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2102 Klass* c = java_lang_Class::as_Klass(mirror); 2103 assert(c->is_instance_klass(), "must be"); 2104 InstanceKlass* ik = InstanceKlass::cast(c); 2105 ResourceMark rm(THREAD); 2106 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2107 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2108 if (ik->is_sealed()) { 2109 JvmtiVMObjectAllocEventCollector oam; 2110 Array<u2>* subclasses = ik->permitted_subclasses(); 2111 int length = subclasses->length(); 2112 2113 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2114 2115 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2116 length, CHECK_NULL); 2117 objArrayHandle result(THREAD, r); 2118 int count = 0; 2119 for (int i = 0; i < length; i++) { 2120 int cp_index = subclasses->at(i); 2121 Klass* k = ik->constants()->klass_at(cp_index, THREAD); 2122 if (HAS_PENDING_EXCEPTION) { 2123 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2124 return NULL; // propagate VMEs 2125 } 2126 if (log_is_enabled(Trace, class, sealed)) { 2127 stringStream ss; 2128 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2129 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2130 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2131 log_trace(class, sealed)("%s", ss.as_string()); 2132 } 2133 2134 CLEAR_PENDING_EXCEPTION; 2135 continue; 2136 } 2137 if (k->is_instance_klass()) { 2138 result->obj_at_put(count++, k->java_mirror()); 2139 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2140 } 2141 } 2142 if (count < length) { 2143 // we had invalid entries so we need to compact the array 2144 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2145 count, CHECK_NULL); 2146 objArrayHandle result2(THREAD, r2); 2147 for (int i = 0; i < count; i++) { 2148 result2->obj_at_put(i, result->obj_at(i)); 2149 } 2150 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2151 } 2152 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2153 } else { 2154 return NULL; 2155 } 2156 } 2157 JVM_END 2158 2159 // Constant pool access ////////////////////////////////////////////////////////// 2160 2161 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2162 { 2163 JvmtiVMObjectAllocEventCollector oam; 2164 oop mirror = JNIHandles::resolve_non_null(cls); 2165 // Return null for primitives and arrays 2166 if (!java_lang_Class::is_primitive(mirror)) { 2167 Klass* k = java_lang_Class::as_Klass(mirror); 2168 if (k->is_instance_klass()) { 2169 InstanceKlass* k_h = InstanceKlass::cast(k); 2170 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2171 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2172 return JNIHandles::make_local(THREAD, jcp()); 2173 } 2174 } 2175 return NULL; 2176 } 2177 JVM_END 2178 2179 2180 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2181 { 2182 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2183 return cp->length(); 2184 } 2185 JVM_END 2186 2187 2188 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2189 { 2190 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2191 bounds_check(cp, index, CHECK_NULL); 2192 constantTag tag = cp->tag_at(index); 2193 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2194 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2195 } 2196 Klass* k = cp->klass_at(index, CHECK_NULL); 2197 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2198 } 2199 JVM_END 2200 2201 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2202 { 2203 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2204 bounds_check(cp, index, CHECK_NULL); 2205 constantTag tag = cp->tag_at(index); 2206 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2207 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2208 } 2209 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2210 if (k == NULL) return NULL; 2211 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2212 } 2213 JVM_END 2214 2215 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2216 constantTag tag = cp->tag_at(index); 2217 if (!tag.is_method() && !tag.is_interface_method()) { 2218 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2219 } 2220 int klass_ref = cp->uncached_klass_ref_index_at(index); 2221 Klass* k_o; 2222 if (force_resolution) { 2223 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2224 } else { 2225 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2226 if (k_o == NULL) return NULL; 2227 } 2228 InstanceKlass* k = InstanceKlass::cast(k_o); 2229 Symbol* name = cp->uncached_name_ref_at(index); 2230 Symbol* sig = cp->uncached_signature_ref_at(index); 2231 methodHandle m (THREAD, k->find_method(name, sig)); 2232 if (m.is_null()) { 2233 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2234 } 2235 oop method; 2236 if (m->is_object_constructor() || m->is_static_vnew_factory()) { 2237 method = Reflection::new_constructor(m, CHECK_NULL); 2238 } else { 2239 method = Reflection::new_method(m, true, CHECK_NULL); 2240 } 2241 return JNIHandles::make_local(THREAD, method); 2242 } 2243 2244 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2245 { 2246 JvmtiVMObjectAllocEventCollector oam; 2247 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2248 bounds_check(cp, index, CHECK_NULL); 2249 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2250 return res; 2251 } 2252 JVM_END 2253 2254 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2255 { 2256 JvmtiVMObjectAllocEventCollector oam; 2257 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2258 bounds_check(cp, index, CHECK_NULL); 2259 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2260 return res; 2261 } 2262 JVM_END 2263 2264 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2265 constantTag tag = cp->tag_at(index); 2266 if (!tag.is_field()) { 2267 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2268 } 2269 int klass_ref = cp->uncached_klass_ref_index_at(index); 2270 Klass* k_o; 2271 if (force_resolution) { 2272 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2273 } else { 2274 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2275 if (k_o == NULL) return NULL; 2276 } 2277 InstanceKlass* k = InstanceKlass::cast(k_o); 2278 Symbol* name = cp->uncached_name_ref_at(index); 2279 Symbol* sig = cp->uncached_signature_ref_at(index); 2280 fieldDescriptor fd; 2281 Klass* target_klass = k->find_field(name, sig, &fd); 2282 if (target_klass == NULL) { 2283 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2284 } 2285 oop field = Reflection::new_field(&fd, CHECK_NULL); 2286 return JNIHandles::make_local(THREAD, field); 2287 } 2288 2289 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2290 { 2291 JvmtiVMObjectAllocEventCollector oam; 2292 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2293 bounds_check(cp, index, CHECK_NULL); 2294 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2295 return res; 2296 } 2297 JVM_END 2298 2299 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2300 { 2301 JvmtiVMObjectAllocEventCollector oam; 2302 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2303 bounds_check(cp, index, CHECK_NULL); 2304 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2305 return res; 2306 } 2307 JVM_END 2308 2309 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2310 { 2311 JvmtiVMObjectAllocEventCollector oam; 2312 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2313 bounds_check(cp, index, CHECK_NULL); 2314 constantTag tag = cp->tag_at(index); 2315 if (!tag.is_field_or_method()) { 2316 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2317 } 2318 int klass_ref = cp->uncached_klass_ref_index_at(index); 2319 Symbol* klass_name = cp->klass_name_at(klass_ref); 2320 Symbol* member_name = cp->uncached_name_ref_at(index); 2321 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2322 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2323 objArrayHandle dest(THREAD, dest_o); 2324 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2325 dest->obj_at_put(0, str()); 2326 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2327 dest->obj_at_put(1, str()); 2328 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2329 dest->obj_at_put(2, str()); 2330 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2331 } 2332 JVM_END 2333 2334 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2335 { 2336 JvmtiVMObjectAllocEventCollector oam; 2337 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2338 bounds_check(cp, index, CHECK_0); 2339 constantTag tag = cp->tag_at(index); 2340 if (!tag.is_field_or_method()) { 2341 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2342 } 2343 return (jint) cp->uncached_klass_ref_index_at(index); 2344 } 2345 JVM_END 2346 2347 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2348 { 2349 JvmtiVMObjectAllocEventCollector oam; 2350 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2351 bounds_check(cp, index, CHECK_0); 2352 constantTag tag = cp->tag_at(index); 2353 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2354 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2355 } 2356 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2357 } 2358 JVM_END 2359 2360 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2361 { 2362 JvmtiVMObjectAllocEventCollector oam; 2363 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2364 bounds_check(cp, index, CHECK_NULL); 2365 constantTag tag = cp->tag_at(index); 2366 if (!tag.is_name_and_type()) { 2367 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2368 } 2369 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2370 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2371 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2372 objArrayHandle dest(THREAD, dest_o); 2373 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2374 dest->obj_at_put(0, str()); 2375 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2376 dest->obj_at_put(1, str()); 2377 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2378 } 2379 JVM_END 2380 2381 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2382 { 2383 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2384 bounds_check(cp, index, CHECK_0); 2385 constantTag tag = cp->tag_at(index); 2386 if (!tag.is_int()) { 2387 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2388 } 2389 return cp->int_at(index); 2390 } 2391 JVM_END 2392 2393 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2394 { 2395 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2396 bounds_check(cp, index, CHECK_(0L)); 2397 constantTag tag = cp->tag_at(index); 2398 if (!tag.is_long()) { 2399 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2400 } 2401 return cp->long_at(index); 2402 } 2403 JVM_END 2404 2405 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2406 { 2407 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2408 bounds_check(cp, index, CHECK_(0.0f)); 2409 constantTag tag = cp->tag_at(index); 2410 if (!tag.is_float()) { 2411 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2412 } 2413 return cp->float_at(index); 2414 } 2415 JVM_END 2416 2417 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2418 { 2419 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2420 bounds_check(cp, index, CHECK_(0.0)); 2421 constantTag tag = cp->tag_at(index); 2422 if (!tag.is_double()) { 2423 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2424 } 2425 return cp->double_at(index); 2426 } 2427 JVM_END 2428 2429 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2430 { 2431 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2432 bounds_check(cp, index, CHECK_NULL); 2433 constantTag tag = cp->tag_at(index); 2434 if (!tag.is_string()) { 2435 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2436 } 2437 oop str = cp->string_at(index, CHECK_NULL); 2438 return (jstring) JNIHandles::make_local(THREAD, str); 2439 } 2440 JVM_END 2441 2442 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2443 { 2444 JvmtiVMObjectAllocEventCollector oam; 2445 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2446 bounds_check(cp, index, CHECK_NULL); 2447 constantTag tag = cp->tag_at(index); 2448 if (!tag.is_symbol()) { 2449 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2450 } 2451 Symbol* sym = cp->symbol_at(index); 2452 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2453 return (jstring) JNIHandles::make_local(THREAD, str()); 2454 } 2455 JVM_END 2456 2457 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2458 { 2459 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2460 bounds_check(cp, index, CHECK_0); 2461 constantTag tag = cp->tag_at(index); 2462 jbyte result = tag.value(); 2463 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2464 // they are changed to the corresponding tags from the JVM spec, so that java code in 2465 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2466 if (tag.is_klass_or_reference()) { 2467 result = JVM_CONSTANT_Class; 2468 } else if (tag.is_string_index()) { 2469 result = JVM_CONSTANT_String; 2470 } else if (tag.is_method_type_in_error()) { 2471 result = JVM_CONSTANT_MethodType; 2472 } else if (tag.is_method_handle_in_error()) { 2473 result = JVM_CONSTANT_MethodHandle; 2474 } else if (tag.is_dynamic_constant_in_error()) { 2475 result = JVM_CONSTANT_Dynamic; 2476 } 2477 return result; 2478 } 2479 JVM_END 2480 2481 // Assertion support. ////////////////////////////////////////////////////////// 2482 2483 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2484 assert(cls != NULL, "bad class"); 2485 2486 oop r = JNIHandles::resolve(cls); 2487 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2488 if (java_lang_Class::is_primitive(r)) return false; 2489 2490 Klass* k = java_lang_Class::as_Klass(r); 2491 assert(k->is_instance_klass(), "must be an instance klass"); 2492 if (!k->is_instance_klass()) return false; 2493 2494 ResourceMark rm(THREAD); 2495 const char* name = k->name()->as_C_string(); 2496 bool system_class = k->class_loader() == NULL; 2497 return JavaAssertions::enabled(name, system_class); 2498 2499 JVM_END 2500 2501 2502 // Return a new AssertionStatusDirectives object with the fields filled in with 2503 // command-line assertion arguments (i.e., -ea, -da). 2504 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2505 JvmtiVMObjectAllocEventCollector oam; 2506 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2507 return JNIHandles::make_local(THREAD, asd); 2508 JVM_END 2509 2510 // Arrays support ///////////////////////////////////////////////////////////// 2511 2512 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2513 oop o = JNIHandles::resolve(array); 2514 Klass* k = o->klass(); 2515 if ((o == NULL) || (!k->is_array_klass())) { 2516 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2517 } 2518 return ArrayKlass::cast(k)->element_access_is_atomic(); 2519 JVM_END 2520 2521 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2522 oop o = JNIHandles::resolve(array); 2523 Klass* k = o->klass(); 2524 if ((o == NULL) || (!k->is_array_klass())) { 2525 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2526 } 2527 if (k->is_flatArray_klass()) { 2528 FlatArrayKlass* vk = FlatArrayKlass::cast(k); 2529 if (!vk->element_access_is_atomic()) { 2530 /** 2531 * Need to decide how to implement: 2532 * 2533 * 1) Change to objArrayOop layout, therefore oop->klass() differs so 2534 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through 2535 * "checkcast" & "instanceof" 2536 * 2537 * 2) Use extra header in the flatArrayOop to flag atomicity required and 2538 * possibly per instance lock structure. Said info, could be placed in 2539 * "trailer" rather than disturb the current arrayOop 2540 */ 2541 Unimplemented(); 2542 } 2543 } 2544 return array; 2545 JVM_END 2546 2547 // Verification //////////////////////////////////////////////////////////////////////////////// 2548 2549 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2550 2551 // RedefineClasses support: bug 6214132 caused verification to fail. 2552 // All functions from this section should call the jvmtiThreadSate function: 2553 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2554 // The function returns a Klass* of the _scratch_class if the verifier 2555 // was invoked in the middle of the class redefinition. 2556 // Otherwise it returns its argument value which is the _the_class Klass*. 2557 // Please, refer to the description in the jvmtiThreadSate.hpp. 2558 2559 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2560 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2561 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2562 return k->name()->as_utf8(); 2563 JVM_END 2564 2565 2566 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2567 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2568 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2569 // types will have length zero if this is not an InstanceKlass 2570 // (length is determined by call to JVM_GetClassCPEntriesCount) 2571 if (k->is_instance_klass()) { 2572 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2573 for (int index = cp->length() - 1; index >= 0; index--) { 2574 constantTag tag = cp->tag_at(index); 2575 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2576 } 2577 } 2578 JVM_END 2579 2580 2581 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2582 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2583 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2584 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2585 JVM_END 2586 2587 2588 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2589 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2590 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2591 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2592 JVM_END 2593 2594 2595 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2596 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2597 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2598 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2599 JVM_END 2600 2601 2602 // The following methods, used for the verifier, are never called with 2603 // array klasses, so a direct cast to InstanceKlass is safe. 2604 // Typically, these methods are called in a loop with bounds determined 2605 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2606 // zero for arrays. 2607 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2608 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2609 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2610 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2611 int length = method->checked_exceptions_length(); 2612 if (length > 0) { 2613 CheckedExceptionElement* table= method->checked_exceptions_start(); 2614 for (int i = 0; i < length; i++) { 2615 exceptions[i] = table[i].class_cp_index; 2616 } 2617 } 2618 JVM_END 2619 2620 2621 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2622 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2623 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2624 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2625 return method->checked_exceptions_length(); 2626 JVM_END 2627 2628 2629 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2630 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2631 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2632 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2633 memcpy(code, method->code_base(), method->code_size()); 2634 JVM_END 2635 2636 2637 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2638 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2639 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2640 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2641 return method->code_size(); 2642 JVM_END 2643 2644 2645 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2646 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2647 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2648 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2649 ExceptionTable extable(method); 2650 entry->start_pc = extable.start_pc(entry_index); 2651 entry->end_pc = extable.end_pc(entry_index); 2652 entry->handler_pc = extable.handler_pc(entry_index); 2653 entry->catchType = extable.catch_type_index(entry_index); 2654 JVM_END 2655 2656 2657 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2658 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2659 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2660 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2661 return method->exception_table_length(); 2662 JVM_END 2663 2664 2665 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2666 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2667 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2668 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2669 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2670 JVM_END 2671 2672 2673 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2674 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2675 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2676 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2677 JVM_END 2678 2679 2680 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2681 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2682 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2683 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2684 return method->max_locals(); 2685 JVM_END 2686 2687 2688 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2689 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2690 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2691 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2692 return method->size_of_parameters(); 2693 JVM_END 2694 2695 2696 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2697 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2698 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2699 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2700 return method->verifier_max_stack(); 2701 JVM_END 2702 2703 2704 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2705 ResourceMark rm(THREAD); 2706 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2707 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2708 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2709 return method->is_object_constructor(); 2710 JVM_END 2711 2712 2713 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2714 ResourceMark rm(THREAD); 2715 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2716 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2717 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2718 return method->is_overpass(); 2719 JVM_END 2720 2721 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2722 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2723 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2724 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2725 return method->name()->as_utf8(); 2726 JVM_END 2727 2728 2729 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2730 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2731 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2732 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2733 return method->signature()->as_utf8(); 2734 JVM_END 2735 2736 /** 2737 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2738 * read entries in the constant pool. Since the old verifier always 2739 * works on a copy of the code, it will not see any rewriting that 2740 * may possibly occur in the middle of verification. So it is important 2741 * that nothing it calls tries to use the cpCache instead of the raw 2742 * constant pool, so we must use cp->uncached_x methods when appropriate. 2743 */ 2744 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2745 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2746 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2747 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2748 switch (cp->tag_at(cp_index).value()) { 2749 case JVM_CONSTANT_Fieldref: 2750 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2751 default: 2752 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2753 } 2754 ShouldNotReachHere(); 2755 return NULL; 2756 JVM_END 2757 2758 2759 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2760 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2761 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2762 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2763 switch (cp->tag_at(cp_index).value()) { 2764 case JVM_CONSTANT_InterfaceMethodref: 2765 case JVM_CONSTANT_Methodref: 2766 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2767 default: 2768 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2769 } 2770 ShouldNotReachHere(); 2771 return NULL; 2772 JVM_END 2773 2774 2775 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2776 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2777 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2778 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2779 switch (cp->tag_at(cp_index).value()) { 2780 case JVM_CONSTANT_InterfaceMethodref: 2781 case JVM_CONSTANT_Methodref: 2782 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2783 default: 2784 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2785 } 2786 ShouldNotReachHere(); 2787 return NULL; 2788 JVM_END 2789 2790 2791 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2792 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2793 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2794 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2795 switch (cp->tag_at(cp_index).value()) { 2796 case JVM_CONSTANT_Fieldref: 2797 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2798 default: 2799 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2800 } 2801 ShouldNotReachHere(); 2802 return NULL; 2803 JVM_END 2804 2805 2806 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2807 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2808 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2809 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2810 Symbol* classname = cp->klass_name_at(cp_index); 2811 return classname->as_utf8(); 2812 JVM_END 2813 2814 2815 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2816 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2817 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2818 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2819 switch (cp->tag_at(cp_index).value()) { 2820 case JVM_CONSTANT_Fieldref: { 2821 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2822 Symbol* classname = cp->klass_name_at(class_index); 2823 return classname->as_utf8(); 2824 } 2825 default: 2826 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2827 } 2828 ShouldNotReachHere(); 2829 return NULL; 2830 JVM_END 2831 2832 2833 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2834 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2835 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2836 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2837 switch (cp->tag_at(cp_index).value()) { 2838 case JVM_CONSTANT_Methodref: 2839 case JVM_CONSTANT_InterfaceMethodref: { 2840 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2841 Symbol* classname = cp->klass_name_at(class_index); 2842 return classname->as_utf8(); 2843 } 2844 default: 2845 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2846 } 2847 ShouldNotReachHere(); 2848 return NULL; 2849 JVM_END 2850 2851 2852 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2853 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2854 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2855 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2856 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2857 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2858 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2859 switch (cp->tag_at(cp_index).value()) { 2860 case JVM_CONSTANT_Fieldref: { 2861 Symbol* name = cp->uncached_name_ref_at(cp_index); 2862 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2863 InstanceKlass* ik = InstanceKlass::cast(k_called); 2864 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2865 if (fs.name() == name && fs.signature() == signature) { 2866 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2867 } 2868 } 2869 return -1; 2870 } 2871 default: 2872 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2873 } 2874 ShouldNotReachHere(); 2875 return 0; 2876 JVM_END 2877 2878 2879 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2880 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2881 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2882 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2883 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2884 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2885 switch (cp->tag_at(cp_index).value()) { 2886 case JVM_CONSTANT_Methodref: 2887 case JVM_CONSTANT_InterfaceMethodref: { 2888 Symbol* name = cp->uncached_name_ref_at(cp_index); 2889 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2890 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2891 int methods_count = methods->length(); 2892 for (int i = 0; i < methods_count; i++) { 2893 Method* method = methods->at(i); 2894 if (method->name() == name && method->signature() == signature) { 2895 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2896 } 2897 } 2898 return -1; 2899 } 2900 default: 2901 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2902 } 2903 ShouldNotReachHere(); 2904 return 0; 2905 JVM_END 2906 2907 2908 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2909 2910 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2911 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2912 JVM_END 2913 2914 2915 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2916 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2917 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2918 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2919 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2920 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2921 JVM_END 2922 2923 // Printing support ////////////////////////////////////////////////// 2924 extern "C" { 2925 2926 ATTRIBUTE_PRINTF(3, 0) 2927 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2928 // Reject count values that are negative signed values converted to 2929 // unsigned; see bug 4399518, 4417214 2930 if ((intptr_t)count <= 0) return -1; 2931 2932 int result = os::vsnprintf(str, count, fmt, args); 2933 if (result > 0 && (size_t)result >= count) { 2934 result = -1; 2935 } 2936 2937 return result; 2938 } 2939 2940 ATTRIBUTE_PRINTF(3, 4) 2941 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2942 va_list args; 2943 int len; 2944 va_start(args, fmt); 2945 len = jio_vsnprintf(str, count, fmt, args); 2946 va_end(args); 2947 return len; 2948 } 2949 2950 ATTRIBUTE_PRINTF(2, 3) 2951 int jio_fprintf(FILE* f, const char *fmt, ...) { 2952 int len; 2953 va_list args; 2954 va_start(args, fmt); 2955 len = jio_vfprintf(f, fmt, args); 2956 va_end(args); 2957 return len; 2958 } 2959 2960 ATTRIBUTE_PRINTF(2, 0) 2961 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2962 if (Arguments::vfprintf_hook() != NULL) { 2963 return Arguments::vfprintf_hook()(f, fmt, args); 2964 } else { 2965 return vfprintf(f, fmt, args); 2966 } 2967 } 2968 2969 ATTRIBUTE_PRINTF(1, 2) 2970 JNIEXPORT int jio_printf(const char *fmt, ...) { 2971 int len; 2972 va_list args; 2973 va_start(args, fmt); 2974 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2975 va_end(args); 2976 return len; 2977 } 2978 2979 // HotSpot specific jio method 2980 void jio_print(const char* s, size_t len) { 2981 // Try to make this function as atomic as possible. 2982 if (Arguments::vfprintf_hook() != NULL) { 2983 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2984 } else { 2985 // Make an unused local variable to avoid warning from gcc compiler. 2986 ssize_t count = os::write(defaultStream::output_fd(), s, (int)len); 2987 } 2988 } 2989 2990 } // Extern C 2991 2992 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2993 2994 // In most of the JVM thread support functions we need to access the 2995 // thread through a ThreadsListHandle to prevent it from exiting and 2996 // being reclaimed while we try to operate on it. The exceptions to this 2997 // rule are when operating on the current thread, or if the monitor of 2998 // the target java.lang.Thread is locked at the Java level - in both 2999 // cases the target cannot exit. 3000 3001 static void thread_entry(JavaThread* thread, TRAPS) { 3002 HandleMark hm(THREAD); 3003 Handle obj(THREAD, thread->threadObj()); 3004 JavaValue result(T_VOID); 3005 JavaCalls::call_virtual(&result, 3006 obj, 3007 vmClasses::Thread_klass(), 3008 vmSymbols::run_method_name(), 3009 vmSymbols::void_method_signature(), 3010 THREAD); 3011 } 3012 3013 3014 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 3015 #if INCLUDE_CDS 3016 if (DumpSharedSpaces) { 3017 // During java -Xshare:dump, if we allow multiple Java threads to 3018 // execute in parallel, symbols and classes may be loaded in 3019 // random orders which will make the resulting CDS archive 3020 // non-deterministic. 3021 // 3022 // Lucikly, during java -Xshare:dump, it's important to run only 3023 // the code in the main Java thread (which is NOT started here) that 3024 // creates the module graph, etc. It's safe to not start the other 3025 // threads which are launched by class static initializers 3026 // (ReferenceHandler, FinalizerThread and CleanerImpl). 3027 if (log_is_enabled(Info, cds)) { 3028 ResourceMark rm; 3029 oop t = JNIHandles::resolve_non_null(jthread); 3030 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 3031 } 3032 return; 3033 } 3034 #endif 3035 JavaThread *native_thread = NULL; 3036 3037 // We cannot hold the Threads_lock when we throw an exception, 3038 // due to rank ordering issues. Example: we might need to grab the 3039 // Heap_lock while we construct the exception. 3040 bool throw_illegal_thread_state = false; 3041 3042 // We must release the Threads_lock before we can post a jvmti event 3043 // in Thread::start. 3044 { 3045 // Ensure that the C++ Thread and OSThread structures aren't freed before 3046 // we operate. 3047 MutexLocker mu(Threads_lock); 3048 3049 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 3050 // re-starting an already started thread, so we should usually find 3051 // that the JavaThread is null. However for a JNI attached thread 3052 // there is a small window between the Thread object being created 3053 // (with its JavaThread set) and the update to its threadStatus, so we 3054 // have to check for this 3055 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 3056 throw_illegal_thread_state = true; 3057 } else { 3058 jlong size = 3059 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 3060 // Allocate the C++ Thread structure and create the native thread. The 3061 // stack size retrieved from java is 64-bit signed, but the constructor takes 3062 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 3063 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 3064 // - Avoid passing negative values which would result in really large stacks. 3065 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 3066 size_t sz = size > 0 ? (size_t) size : 0; 3067 native_thread = new JavaThread(&thread_entry, sz); 3068 3069 // At this point it may be possible that no osthread was created for the 3070 // JavaThread due to lack of memory. Check for this situation and throw 3071 // an exception if necessary. Eventually we may want to change this so 3072 // that we only grab the lock if the thread was created successfully - 3073 // then we can also do this check and throw the exception in the 3074 // JavaThread constructor. 3075 if (native_thread->osthread() != NULL) { 3076 // Note: the current thread is not being used within "prepare". 3077 native_thread->prepare(jthread); 3078 } 3079 } 3080 } 3081 3082 if (throw_illegal_thread_state) { 3083 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3084 } 3085 3086 assert(native_thread != NULL, "Starting null thread?"); 3087 3088 if (native_thread->osthread() == NULL) { 3089 ResourceMark rm(thread); 3090 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 3091 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 3092 // No one should hold a reference to the 'native_thread'. 3093 native_thread->smr_delete(); 3094 if (JvmtiExport::should_post_resource_exhausted()) { 3095 JvmtiExport::post_resource_exhausted( 3096 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3097 os::native_thread_creation_failed_msg()); 3098 } 3099 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3100 os::native_thread_creation_failed_msg()); 3101 } 3102 3103 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3104 3105 Thread::start(native_thread); 3106 3107 JVM_END 3108 3109 3110 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 3111 oop thread_oop = JNIHandles::resolve_non_null(jthread); 3112 return java_lang_Thread::is_alive(thread_oop); 3113 JVM_END 3114 3115 3116 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3117 ThreadsListHandle tlh(thread); 3118 oop java_thread = NULL; 3119 JavaThread* receiver = NULL; 3120 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3121 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3122 3123 if (is_alive) { 3124 // jthread refers to a live JavaThread. 3125 Thread::set_priority(receiver, (ThreadPriority)prio); 3126 } 3127 // Implied else: If the JavaThread hasn't started yet, then the 3128 // priority set in the java.lang.Thread object above will be pushed 3129 // down when it does start. 3130 JVM_END 3131 3132 3133 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3134 if (os::dont_yield()) return; 3135 HOTSPOT_THREAD_YIELD(); 3136 os::naked_yield(); 3137 JVM_END 3138 3139 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3140 if (millis < 0) { 3141 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3142 } 3143 3144 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3145 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3146 } 3147 3148 // Save current thread state and restore it at the end of this block. 3149 // And set new thread state to SLEEPING. 3150 JavaThreadSleepState jtss(thread); 3151 3152 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3153 3154 if (millis == 0) { 3155 os::naked_yield(); 3156 } else { 3157 ThreadState old_state = thread->osthread()->get_state(); 3158 thread->osthread()->set_state(SLEEPING); 3159 if (!thread->sleep(millis)) { // interrupted 3160 // An asynchronous exception could have been thrown on 3161 // us while we were sleeping. We do not overwrite those. 3162 if (!HAS_PENDING_EXCEPTION) { 3163 HOTSPOT_THREAD_SLEEP_END(1); 3164 3165 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3166 // to properly restore the thread state. That's likely wrong. 3167 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3168 } 3169 } 3170 thread->osthread()->set_state(old_state); 3171 } 3172 HOTSPOT_THREAD_SLEEP_END(0); 3173 JVM_END 3174 3175 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3176 oop jthread = thread->threadObj(); 3177 assert(jthread != NULL, "no current carrier thread!"); 3178 return JNIHandles::make_local(THREAD, jthread); 3179 JVM_END 3180 3181 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3182 oop theThread = thread->vthread(); 3183 assert(theThread != (oop)NULL, "no current thread!"); 3184 return JNIHandles::make_local(THREAD, theThread); 3185 JVM_END 3186 3187 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3188 jobject theThread)) 3189 oop threadObj = JNIHandles::resolve(theThread); 3190 thread->set_vthread(threadObj); 3191 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3192 JVM_END 3193 3194 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3195 return ThreadIdentifier::unsafe_offset(); 3196 JVM_END 3197 3198 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3199 ThreadsListHandle tlh(thread); 3200 JavaThread* receiver = NULL; 3201 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3202 if (is_alive) { 3203 // jthread refers to a live JavaThread. 3204 receiver->interrupt(); 3205 } 3206 JVM_END 3207 3208 // Return true iff the current thread has locked the object passed in 3209 3210 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3211 if (obj == NULL) { 3212 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3213 } 3214 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3215 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3216 JVM_END 3217 3218 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3219 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD); 3220 return JNIHandles::make_local(THREAD, trace); 3221 JVM_END 3222 3223 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3224 VM_PrintThreads op; 3225 VMThread::execute(&op); 3226 if (JvmtiExport::should_post_data_dump()) { 3227 JvmtiExport::post_data_dump(); 3228 } 3229 JVM_END 3230 3231 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3232 // We don't use a ThreadsListHandle here because the current thread 3233 // must be alive. 3234 oop java_thread = JNIHandles::resolve_non_null(jthread); 3235 JavaThread* thr = java_lang_Thread::thread(java_thread); 3236 if (thread == thr && !thr->has_attached_via_jni()) { 3237 // Thread naming is only supported for the current thread and 3238 // we don't set the name of an attached thread to avoid stepping 3239 // on other programs. 3240 ResourceMark rm(thread); 3241 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3242 os::set_native_thread_name(thread_name); 3243 } 3244 JVM_END 3245 3246 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3247 oop theCache = thread->scopedValueCache(); 3248 return JNIHandles::make_local(THREAD, theCache); 3249 JVM_END 3250 3251 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3252 jobject theCache)) 3253 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3254 thread->set_scopedValueCache(objs); 3255 JVM_END 3256 3257 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3258 3259 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3260 ResourceMark rm(THREAD); 3261 JvmtiVMObjectAllocEventCollector oam; 3262 vframeStream vfst(thread); 3263 3264 if (vmClasses::reflect_CallerSensitive_klass() != NULL) { 3265 // This must only be called from SecurityManager.getClassContext 3266 Method* m = vfst.method(); 3267 if (!(m->method_holder() == vmClasses::SecurityManager_klass() && 3268 m->name() == vmSymbols::getClassContext_name() && 3269 m->signature() == vmSymbols::void_class_array_signature())) { 3270 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3271 } 3272 } 3273 3274 // Collect method holders 3275 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3276 for (; !vfst.at_end(); vfst.security_next()) { 3277 Method* m = vfst.method(); 3278 // Native frames are not returned 3279 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3280 Klass* holder = m->method_holder(); 3281 assert(holder->is_klass(), "just checking"); 3282 klass_array->append(holder); 3283 } 3284 } 3285 3286 // Create result array of type [Ljava/lang/Class; 3287 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL); 3288 // Fill in mirrors corresponding to method holders 3289 for (int i = 0; i < klass_array->length(); i++) { 3290 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3291 } 3292 3293 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3294 JVM_END 3295 3296 3297 // java.lang.Package //////////////////////////////////////////////////////////////// 3298 3299 3300 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3301 ResourceMark rm(THREAD); 3302 JvmtiVMObjectAllocEventCollector oam; 3303 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3304 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3305 return (jstring) JNIHandles::make_local(THREAD, result); 3306 JVM_END 3307 3308 3309 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3310 JvmtiVMObjectAllocEventCollector oam; 3311 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3312 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3313 JVM_END 3314 3315 3316 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3317 3318 3319 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3320 MonitorLocker ml(Heap_lock); 3321 oop ref = Universe::reference_pending_list(); 3322 if (ref != NULL) { 3323 Universe::clear_reference_pending_list(); 3324 } 3325 return JNIHandles::make_local(THREAD, ref); 3326 JVM_END 3327 3328 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3329 MonitorLocker ml(Heap_lock); 3330 return Universe::has_reference_pending_list(); 3331 JVM_END 3332 3333 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3334 MonitorLocker ml(Heap_lock); 3335 while (!Universe::has_reference_pending_list()) { 3336 ml.wait(); 3337 } 3338 JVM_END 3339 3340 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3341 oop ref_oop = JNIHandles::resolve_non_null(ref); 3342 // PhantomReference has it's own implementation of refersTo(). 3343 // See: JVM_PhantomReferenceRefersTo 3344 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3345 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3346 return referent == JNIHandles::resolve(o); 3347 JVM_END 3348 3349 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3350 oop ref_oop = JNIHandles::resolve_non_null(ref); 3351 // FinalReference has it's own implementation of clear(). 3352 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3353 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == NULL) { 3354 // If the referent has already been cleared then done. 3355 // However, if the referent is dead but has not yet been cleared by 3356 // concurrent reference processing, it should NOT be cleared here. 3357 // Instead, clearing should be left to the GC. Clearing it here could 3358 // detectably lose an expected notification, which is impossible with 3359 // STW reference processing. The clearing in enqueue() doesn't have 3360 // this problem, since the enqueue covers the notification, but it's not 3361 // worth the effort to handle that case specially. 3362 return; 3363 } 3364 java_lang_ref_Reference::clear_referent(ref_oop); 3365 JVM_END 3366 3367 3368 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3369 3370 3371 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3372 oop ref_oop = JNIHandles::resolve_non_null(ref); 3373 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3374 return referent == JNIHandles::resolve(o); 3375 JVM_END 3376 3377 3378 // ObjectInputStream /////////////////////////////////////////////////////////////// 3379 3380 // Return the first user-defined class loader up the execution stack, or null 3381 // if only code from the bootstrap or platform class loader is on the stack. 3382 3383 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3384 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3385 InstanceKlass* ik = vfst.method()->method_holder(); 3386 oop loader = ik->class_loader(); 3387 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3388 // Skip reflection related frames 3389 if (!ik->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass()) && 3390 !ik->is_subclass_of(vmClasses::reflect_ConstructorAccessorImpl_klass())) { 3391 return JNIHandles::make_local(THREAD, loader); 3392 } 3393 } 3394 } 3395 return NULL; 3396 JVM_END 3397 3398 3399 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3400 3401 3402 // resolve array handle and check arguments 3403 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3404 if (arr == NULL) { 3405 THROW_0(vmSymbols::java_lang_NullPointerException()); 3406 } 3407 oop a = JNIHandles::resolve_non_null(arr); 3408 if (!a->is_array()) { 3409 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3410 } else if (type_array_only && !a->is_typeArray()) { 3411 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3412 } 3413 return arrayOop(a); 3414 } 3415 3416 3417 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3418 arrayOop a = check_array(env, arr, false, CHECK_0); 3419 return a->length(); 3420 JVM_END 3421 3422 3423 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3424 JvmtiVMObjectAllocEventCollector oam; 3425 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3426 jvalue value; 3427 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3428 oop box = Reflection::box(&value, type, CHECK_NULL); 3429 return JNIHandles::make_local(THREAD, box); 3430 JVM_END 3431 3432 3433 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3434 jvalue value; 3435 value.i = 0; // to initialize value before getting used in CHECK 3436 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3437 assert(a->is_typeArray(), "just checking"); 3438 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3439 BasicType wide_type = (BasicType) wCode; 3440 if (type != wide_type) { 3441 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3442 } 3443 return value; 3444 JVM_END 3445 3446 3447 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3448 arrayOop a = check_array(env, arr, false, CHECK); 3449 oop box = JNIHandles::resolve(val); 3450 jvalue value; 3451 value.i = 0; // to initialize value before getting used in CHECK 3452 BasicType value_type; 3453 if (a->is_objArray()) { 3454 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3455 value_type = Reflection::unbox_for_regular_object(box, &value); 3456 } else { 3457 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3458 } 3459 Reflection::array_set(&value, a, index, value_type, CHECK); 3460 JVM_END 3461 3462 3463 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3464 arrayOop a = check_array(env, arr, true, CHECK); 3465 assert(a->is_typeArray(), "just checking"); 3466 BasicType value_type = (BasicType) vCode; 3467 Reflection::array_set(&v, a, index, value_type, CHECK); 3468 JVM_END 3469 3470 3471 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3472 JvmtiVMObjectAllocEventCollector oam; 3473 oop element_mirror = JNIHandles::resolve(eltClass); 3474 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3475 return JNIHandles::make_local(THREAD, result); 3476 JVM_END 3477 3478 3479 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3480 JvmtiVMObjectAllocEventCollector oam; 3481 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3482 oop element_mirror = JNIHandles::resolve(eltClass); 3483 assert(dim_array->is_typeArray(), "just checking"); 3484 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3485 return JNIHandles::make_local(THREAD, result); 3486 JVM_END 3487 3488 3489 // Library support /////////////////////////////////////////////////////////////////////////// 3490 3491 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3492 ClassLoader::load_zip_library_if_needed(); 3493 return ClassLoader::zip_library_handle(); 3494 JVM_END 3495 3496 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3497 //%note jvm_ct 3498 char ebuf[1024]; 3499 void *load_result; 3500 { 3501 ThreadToNativeFromVM ttnfvm(thread); 3502 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3503 } 3504 if (load_result == NULL) { 3505 if (throwException) { 3506 char msg[1024]; 3507 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3508 // Since 'ebuf' may contain a string encoded using 3509 // platform encoding scheme, we need to pass 3510 // Exceptions::unsafe_to_utf8 to the new_exception method 3511 // as the last argument. See bug 6367357. 3512 Handle h_exception = 3513 Exceptions::new_exception(thread, 3514 vmSymbols::java_lang_UnsatisfiedLinkError(), 3515 msg, Exceptions::unsafe_to_utf8); 3516 3517 THROW_HANDLE_0(h_exception); 3518 } else { 3519 log_info(library)("Failed to load library %s", name); 3520 return load_result; 3521 } 3522 } 3523 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3524 return load_result; 3525 JVM_END 3526 3527 3528 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3529 os::dll_unload(handle); 3530 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3531 JVM_END 3532 3533 3534 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3535 void* find_result = os::dll_lookup(handle, name); 3536 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3537 find_result != NULL ? "Found" : "Failed to find", 3538 name, p2i(handle)); 3539 return find_result; 3540 JVM_END 3541 3542 3543 // JNI version /////////////////////////////////////////////////////////////////////////////// 3544 3545 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3546 return Threads::is_supported_jni_version_including_1_1(version); 3547 JVM_END 3548 3549 3550 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3551 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3552 JVM_END 3553 3554 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void)) 3555 return EnableValhalla ? JNI_TRUE : JNI_FALSE; 3556 JVM_END 3557 3558 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3559 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3560 JVM_END 3561 3562 // String support /////////////////////////////////////////////////////////////////////////// 3563 3564 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3565 JvmtiVMObjectAllocEventCollector oam; 3566 if (str == NULL) return NULL; 3567 oop string = JNIHandles::resolve_non_null(str); 3568 oop result = StringTable::intern(string, CHECK_NULL); 3569 return (jstring) JNIHandles::make_local(THREAD, result); 3570 JVM_END 3571 3572 3573 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3574 3575 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3576 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3577 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3578 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3579 // nature. JavaThreads will be "in native" when using this API from JDK code. 3580 3581 3582 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3583 VM_Exit::block_if_vm_exited(); 3584 return new PlatformMutex(); 3585 } 3586 3587 3588 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3589 VM_Exit::block_if_vm_exited(); 3590 delete ((PlatformMutex*) mon); 3591 } 3592 3593 3594 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3595 VM_Exit::block_if_vm_exited(); 3596 ((PlatformMutex*) mon)->lock(); 3597 return 0; 3598 } 3599 3600 3601 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3602 VM_Exit::block_if_vm_exited(); 3603 ((PlatformMutex*) mon)->unlock(); 3604 } 3605 3606 3607 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3608 3609 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3610 Handle loader, Handle protection_domain, 3611 jboolean throwError, TRAPS) { 3612 // Security Note: 3613 // The Java level wrapper will perform the necessary security check allowing 3614 // us to pass the NULL as the initiating class loader. The VM is responsible for 3615 // the checkPackageAccess relative to the initiating class loader via the 3616 // protection_domain. The protection_domain is passed as NULL by the java code 3617 // if there is no security manager in 3-arg Class.forName(). 3618 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3619 3620 // Check if we should initialize the class 3621 if (init && klass->is_instance_klass()) { 3622 klass->initialize(CHECK_NULL); 3623 } 3624 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3625 } 3626 3627 3628 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3629 3630 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3631 Handle method_handle; 3632 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3633 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3634 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3635 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL); 3636 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3637 jobject res = JNIHandles::make_local(THREAD, result); 3638 if (JvmtiExport::should_post_vm_object_alloc()) { 3639 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3640 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3641 if (java_lang_Class::is_primitive(ret_type)) { 3642 // Only for primitive type vm allocates memory for java object. 3643 // See box() method. 3644 JvmtiExport::post_vm_object_alloc(thread, result); 3645 } 3646 } 3647 return res; 3648 } else { 3649 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3650 } 3651 JVM_END 3652 3653 3654 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3655 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL); 3656 oop constructor_mirror = JNIHandles::resolve(c); 3657 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3658 jobject res = JNIHandles::make_local(THREAD, result); 3659 if (JvmtiExport::should_post_vm_object_alloc()) { 3660 JvmtiExport::post_vm_object_alloc(thread, result); 3661 } 3662 return res; 3663 JVM_END 3664 3665 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3666 3667 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3668 return VM_Version::supports_cx8(); 3669 JVM_END 3670 3671 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3672 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3673 assert(k->is_klass(), "just checking"); 3674 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3675 JVM_END 3676 3677 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3678 jclass caller, 3679 jstring interfaceMethodName, 3680 jobject factoryType, 3681 jobject interfaceMethodType, 3682 jobject implementationMember, 3683 jobject dynamicMethodType, 3684 jclass lambdaProxyClass)) 3685 #if INCLUDE_CDS 3686 if (!Arguments::is_dumping_archive()) { 3687 return; 3688 } 3689 3690 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3691 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3692 if (caller_ik->is_hidden()) { 3693 // Hidden classes not of type lambda proxy classes are currently not being archived. 3694 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3695 // registered for archiving. 3696 return; 3697 } 3698 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass)); 3699 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k); 3700 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3701 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3702 3703 Symbol* interface_method_name = NULL; 3704 if (interfaceMethodName != NULL) { 3705 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3706 } 3707 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3708 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3709 3710 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3711 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3712 3713 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3714 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3715 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3716 3717 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3718 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3719 3720 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3721 interface_method_type, m, dynamic_method_type, THREAD); 3722 #endif // INCLUDE_CDS 3723 JVM_END 3724 3725 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3726 jclass caller, 3727 jstring interfaceMethodName, 3728 jobject factoryType, 3729 jobject interfaceMethodType, 3730 jobject implementationMember, 3731 jobject dynamicMethodType)) 3732 #if INCLUDE_CDS 3733 3734 if (interfaceMethodName == NULL || factoryType == NULL || interfaceMethodType == NULL || 3735 implementationMember == NULL || dynamicMethodType == NULL) { 3736 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 3737 } 3738 3739 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3740 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3741 if (!caller_ik->is_shared()) { 3742 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3743 return NULL; 3744 } 3745 3746 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3747 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3748 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3749 3750 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3751 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3752 3753 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3754 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3755 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3756 3757 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3758 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3759 3760 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3761 interface_method_type, m, dynamic_method_type); 3762 jclass jcls = NULL; 3763 if (lambda_ik != NULL) { 3764 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD); 3765 jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3766 } 3767 return jcls; 3768 #else 3769 return NULL; 3770 #endif // INCLUDE_CDS 3771 JVM_END 3772 3773 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env)) 3774 return Arguments::is_dumping_archive(); 3775 JVM_END 3776 3777 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env)) 3778 return UseSharedSpaces; 3779 JVM_END 3780 3781 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3782 if (DumpSharedSpaces) { 3783 const char* release = VM_Version::vm_release(); 3784 const char* dbg_level = VM_Version::jdk_debug_level(); 3785 const char* version = VM_Version::internal_vm_info_string(); 3786 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3787 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3788 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3789 seed += (jlong)VM_Version::vm_major_version(); 3790 seed += (jlong)VM_Version::vm_minor_version(); 3791 seed += (jlong)VM_Version::vm_security_version(); 3792 seed += (jlong)VM_Version::vm_patch_version(); 3793 if (seed == 0) { // don't let this ever be zero. 3794 seed = 0x87654321; 3795 } 3796 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3797 return seed; 3798 } else { 3799 return 0; 3800 } 3801 JVM_END 3802 3803 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env)) 3804 #if INCLUDE_CDS 3805 return ClassListWriter::is_enabled() || DynamicDumpSharedSpaces; 3806 #else 3807 return false; 3808 #endif // INCLUDE_CDS 3809 JVM_END 3810 3811 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3812 #if INCLUDE_CDS 3813 assert(ClassListWriter::is_enabled() || DynamicDumpSharedSpaces, "Should be set and open or do dynamic dump"); 3814 if (line != NULL) { 3815 ResourceMark rm(THREAD); 3816 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3817 char* c_line = java_lang_String::as_utf8_string(h_line()); 3818 if (DynamicDumpSharedSpaces) { 3819 // Note: LambdaFormInvokers::append take same format which is not 3820 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3821 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3822 } 3823 if (ClassListWriter::is_enabled()) { 3824 ClassListWriter w; 3825 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line); 3826 } 3827 } 3828 #endif // INCLUDE_CDS 3829 JVM_END 3830 3831 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3832 #if INCLUDE_CDS 3833 ResourceMark rm(THREAD); 3834 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3835 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3836 MetaspaceShared::dump_loaded_classes(file_name, THREAD); 3837 #endif // INCLUDE_CDS 3838 JVM_END 3839 3840 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3841 #if INCLUDE_CDS 3842 ResourceMark rm(THREAD); 3843 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3844 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3845 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3846 #endif // INCLUDE_CDS 3847 JVM_END 3848 3849 // Returns an array of all live Thread objects (VM internal JavaThreads, 3850 // jvmti agent threads, and JNI attaching threads are skipped) 3851 // See CR 6404306 regarding JNI attaching threads 3852 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3853 ResourceMark rm(THREAD); 3854 ThreadsListEnumerator tle(THREAD, false, false); 3855 JvmtiVMObjectAllocEventCollector oam; 3856 3857 int num_threads = tle.num_threads(); 3858 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3859 objArrayHandle threads_ah(THREAD, r); 3860 3861 for (int i = 0; i < num_threads; i++) { 3862 Handle h = tle.get_threadObj(i); 3863 threads_ah->obj_at_put(i, h()); 3864 } 3865 3866 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3867 JVM_END 3868 3869 3870 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3871 // Return StackTraceElement[][], each element is the stack trace of a thread in 3872 // the corresponding entry in the given threads array 3873 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3874 JvmtiVMObjectAllocEventCollector oam; 3875 3876 // Check if threads is null 3877 if (threads == NULL) { 3878 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3879 } 3880 3881 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3882 objArrayHandle ah(THREAD, a); 3883 int num_threads = ah->length(); 3884 // check if threads is non-empty array 3885 if (num_threads == 0) { 3886 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3887 } 3888 3889 // check if threads is not an array of objects of Thread class 3890 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3891 if (k != vmClasses::Thread_klass()) { 3892 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3893 } 3894 3895 ResourceMark rm(THREAD); 3896 3897 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3898 for (int i = 0; i < num_threads; i++) { 3899 oop thread_obj = ah->obj_at(i); 3900 instanceHandle h(THREAD, (instanceOop) thread_obj); 3901 thread_handle_array->append(h); 3902 } 3903 3904 // The JavaThread references in thread_handle_array are validated 3905 // in VM_ThreadDump::doit(). 3906 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3907 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3908 3909 JVM_END 3910 3911 // JVM monitoring and management support 3912 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3913 return Management::get_jmm_interface(version); 3914 JVM_END 3915 3916 // com.sun.tools.attach.VirtualMachine agent properties support 3917 // 3918 // Initialize the agent properties with the properties maintained in the VM 3919 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3920 ResourceMark rm; 3921 3922 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3923 3924 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3925 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3926 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3927 return properties; 3928 JVM_END 3929 3930 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3931 { 3932 JvmtiVMObjectAllocEventCollector oam; 3933 3934 if (ofClass == NULL) { 3935 return NULL; 3936 } 3937 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3938 // Special handling for primitive objects 3939 if (java_lang_Class::is_primitive(mirror())) { 3940 return NULL; 3941 } 3942 Klass* k = java_lang_Class::as_Klass(mirror()); 3943 if (!k->is_instance_klass()) { 3944 return NULL; 3945 } 3946 InstanceKlass* ik = InstanceKlass::cast(k); 3947 int encl_method_class_idx = ik->enclosing_method_class_index(); 3948 if (encl_method_class_idx == 0) { 3949 return NULL; 3950 } 3951 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3952 objArrayHandle dest(THREAD, dest_o); 3953 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3954 dest->obj_at_put(0, enc_k->java_mirror()); 3955 int encl_method_method_idx = ik->enclosing_method_method_index(); 3956 if (encl_method_method_idx != 0) { 3957 Symbol* sym = ik->constants()->symbol_at( 3958 extract_low_short_from_int( 3959 ik->constants()->name_and_type_at(encl_method_method_idx))); 3960 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3961 dest->obj_at_put(1, str()); 3962 sym = ik->constants()->symbol_at( 3963 extract_high_short_from_int( 3964 ik->constants()->name_and_type_at(encl_method_method_idx))); 3965 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3966 dest->obj_at_put(2, str()); 3967 } 3968 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3969 } 3970 JVM_END 3971 3972 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3973 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3974 ResourceMark rm(THREAD); 3975 3976 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3977 return NULL; 3978 } 3979 3980 char** vm_flags = Arguments::jvm_flags_array(); 3981 char** vm_args = Arguments::jvm_args_array(); 3982 int num_flags = Arguments::num_jvm_flags(); 3983 int num_args = Arguments::num_jvm_args(); 3984 3985 InstanceKlass* ik = vmClasses::String_klass(); 3986 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3987 objArrayHandle result_h(THREAD, r); 3988 3989 int index = 0; 3990 for (int j = 0; j < num_flags; j++, index++) { 3991 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3992 result_h->obj_at_put(index, h()); 3993 } 3994 for (int i = 0; i < num_args; i++, index++) { 3995 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3996 result_h->obj_at_put(index, h()); 3997 } 3998 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 3999 JVM_END 4000 4001 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 4002 return os::get_signal_number(name); 4003 JVM_END 4004 4005 JVM_ENTRY(void, JVM_VirtualThreadMountBegin(JNIEnv* env, jobject vthread, jboolean first_mount)) 4006 #if INCLUDE_JVMTI 4007 if (!DoJVMTIVirtualThreadTransitions) { 4008 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4009 return; 4010 } 4011 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check"); 4012 assert(!thread->is_in_VTMS_transition(), "sanity check"); 4013 JvmtiVTMSTransitionDisabler::start_VTMS_transition(vthread, /* is_mount */ true); 4014 #else 4015 fatal("Should only be called with JVMTI enabled"); 4016 #endif 4017 JVM_END 4018 4019 JVM_ENTRY(void, JVM_VirtualThreadMountEnd(JNIEnv* env, jobject vthread, jboolean first_mount)) 4020 #if INCLUDE_JVMTI 4021 if (!DoJVMTIVirtualThreadTransitions) { 4022 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4023 return; 4024 } 4025 oop vt = JNIHandles::resolve(vthread); 4026 4027 thread->rebind_to_jvmti_thread_state_of(vt); 4028 4029 { 4030 MutexLocker mu(JvmtiThreadState_lock); 4031 JvmtiThreadState* state = thread->jvmti_thread_state(); 4032 if (state != NULL && state->is_pending_interp_only_mode()) { 4033 JvmtiEventController::enter_interp_only_mode(); 4034 } 4035 } 4036 assert(thread->is_in_VTMS_transition(), "sanity check"); 4037 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check"); 4038 JvmtiVTMSTransitionDisabler::finish_VTMS_transition(vthread, /* is_mount */ true); 4039 if (first_mount) { 4040 // thread start 4041 if (JvmtiExport::can_support_virtual_threads()) { 4042 JvmtiEventController::thread_started(thread); 4043 if (JvmtiExport::should_post_vthread_start()) { 4044 JvmtiExport::post_vthread_start(vthread); 4045 } 4046 } else { // compatibility for vthread unaware agents: legacy thread_start 4047 if (PostVirtualThreadCompatibleLifecycleEvents && 4048 JvmtiExport::should_post_thread_life()) { 4049 // JvmtiEventController::thread_started is called here 4050 JvmtiExport::post_thread_start(thread); 4051 } 4052 } 4053 } 4054 if (JvmtiExport::should_post_vthread_mount()) { 4055 JvmtiExport::post_vthread_mount(vthread); 4056 } 4057 #else 4058 fatal("Should only be called with JVMTI enabled"); 4059 #endif 4060 JVM_END 4061 4062 JVM_ENTRY(void, JVM_VirtualThreadUnmountBegin(JNIEnv* env, jobject vthread, jboolean last_unmount)) 4063 #if INCLUDE_JVMTI 4064 if (!DoJVMTIVirtualThreadTransitions) { 4065 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4066 return; 4067 } 4068 HandleMark hm(thread); 4069 Handle ct(thread, thread->threadObj()); 4070 4071 if (JvmtiExport::should_post_vthread_unmount()) { 4072 JvmtiExport::post_vthread_unmount(vthread); 4073 } 4074 if (last_unmount) { 4075 if (JvmtiExport::can_support_virtual_threads()) { 4076 if (JvmtiExport::should_post_vthread_end()) { 4077 JvmtiExport::post_vthread_end(vthread); 4078 } 4079 } else { // compatibility for vthread unaware agents: legacy thread_end 4080 if (PostVirtualThreadCompatibleLifecycleEvents && 4081 JvmtiExport::should_post_thread_life()) { 4082 JvmtiExport::post_thread_end(thread); 4083 } 4084 } 4085 } 4086 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check"); 4087 assert(!thread->is_in_VTMS_transition(), "sanity check"); 4088 JvmtiVTMSTransitionDisabler::start_VTMS_transition(vthread, /* is_mount */ false); 4089 4090 if (last_unmount && thread->jvmti_thread_state() != NULL) { 4091 JvmtiExport::cleanup_thread(thread); 4092 thread->set_jvmti_thread_state(NULL); 4093 oop vt = JNIHandles::resolve(vthread); 4094 java_lang_Thread::set_jvmti_thread_state(vt, NULL); 4095 } 4096 thread->rebind_to_jvmti_thread_state_of(ct()); 4097 #else 4098 fatal("Should only be called with JVMTI enabled"); 4099 #endif 4100 JVM_END 4101 4102 JVM_ENTRY(void, JVM_VirtualThreadUnmountEnd(JNIEnv* env, jobject vthread, jboolean last_unmount)) 4103 #if INCLUDE_JVMTI 4104 if (!DoJVMTIVirtualThreadTransitions) { 4105 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4106 return; 4107 } 4108 assert(thread->is_in_VTMS_transition(), "sanity check"); 4109 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check"); 4110 JvmtiVTMSTransitionDisabler::finish_VTMS_transition(vthread, /* is_mount */ false); 4111 #else 4112 fatal("Should only be called with JVMTI enabled"); 4113 #endif 4114 JVM_END 4115 4116 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jobject vthread, jboolean hide)) 4117 #if INCLUDE_JVMTI 4118 if (!DoJVMTIVirtualThreadTransitions) { 4119 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4120 return; 4121 } 4122 assert(!thread->is_in_VTMS_transition(), "sanity check"); 4123 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check"); 4124 thread->toggle_is_in_tmp_VTMS_transition(); 4125 #else 4126 fatal("Should only be called with JVMTI enabled"); 4127 #endif 4128 JVM_END 4129 4130 /* 4131 * Return the current class's class file version. The low order 16 bits of the 4132 * returned jint contain the class's major version. The high order 16 bits 4133 * contain the class's minor version. 4134 */ 4135 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 4136 oop mirror = JNIHandles::resolve_non_null(current); 4137 if (java_lang_Class::is_primitive(mirror)) { 4138 // return latest major version and minor version of 0. 4139 return JVM_CLASSFILE_MAJOR_VERSION; 4140 } 4141 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class"); 4142 4143 Klass* c = java_lang_Class::as_Klass(mirror); 4144 assert(c->is_instance_klass(), "must be"); 4145 InstanceKlass* ik = InstanceKlass::cast(c); 4146 return (ik->minor_version() << 16) | ik->major_version(); 4147 JVM_END 4148 4149 /* 4150 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 4151 * get the value will see a materialized value and not a scalar-replaced 4152 * null value. 4153 */ 4154 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 4155 JVM_EnsureMaterializedForStackWalk(env, value); 4156 JVM_END