1 /* 2 * Copyright (c) 1997, 2024, 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/cdsConfig.hpp" 27 #include "cds/classListParser.hpp" 28 #include "cds/classListWriter.hpp" 29 #include "cds/dynamicArchive.hpp" 30 #include "cds/heapShared.hpp" 31 #include "cds/lambdaFormInvokers.hpp" 32 #include "classfile/classFileStream.hpp" 33 #include "classfile/classLoader.inline.hpp" 34 #include "classfile/classLoaderData.hpp" 35 #include "classfile/classLoaderData.inline.hpp" 36 #include "classfile/classLoadInfo.hpp" 37 #include "classfile/javaAssertions.hpp" 38 #include "classfile/javaClasses.inline.hpp" 39 #include "classfile/moduleEntry.hpp" 40 #include "classfile/modules.hpp" 41 #include "classfile/packageEntry.hpp" 42 #include "classfile/stringTable.hpp" 43 #include "classfile/symbolTable.hpp" 44 #include "classfile/systemDictionary.hpp" 45 #include "classfile/vmClasses.hpp" 46 #include "classfile/vmSymbols.hpp" 47 #include "gc/shared/collectedHeap.inline.hpp" 48 #include "interpreter/bytecode.hpp" 49 #include "interpreter/bytecodeUtils.hpp" 50 #include "jfr/jfrEvents.hpp" 51 #include "jvm.h" 52 #include "logging/log.hpp" 53 #include "memory/oopFactory.hpp" 54 #include "memory/referenceType.hpp" 55 #include "memory/resourceArea.hpp" 56 #include "memory/universe.hpp" 57 #include "oops/access.inline.hpp" 58 #include "oops/constantPool.hpp" 59 #include "oops/fieldStreams.inline.hpp" 60 #include "oops/flatArrayKlass.hpp" 61 #include "oops/instanceKlass.hpp" 62 #include "oops/klass.inline.hpp" 63 #include "oops/method.hpp" 64 #include "oops/recordComponent.hpp" 65 #include "oops/objArrayKlass.hpp" 66 #include "oops/objArrayOop.inline.hpp" 67 #include "oops/oop.inline.hpp" 68 #include "prims/foreignGlobals.hpp" 69 #include "prims/jvm_misc.hpp" 70 #include "prims/jvmtiExport.hpp" 71 #include "prims/jvmtiThreadState.inline.hpp" 72 #include "prims/stackwalk.hpp" 73 #include "runtime/arguments.hpp" 74 #include "runtime/atomic.hpp" 75 #include "runtime/continuation.hpp" 76 #include "runtime/globals_extension.hpp" 77 #include "runtime/handles.inline.hpp" 78 #include "runtime/init.hpp" 79 #include "runtime/interfaceSupport.inline.hpp" 80 #include "runtime/deoptimization.hpp" 81 #include "runtime/handshake.hpp" 82 #include "runtime/java.hpp" 83 #include "runtime/javaCalls.hpp" 84 #include "runtime/javaThread.hpp" 85 #include "runtime/jfieldIDWorkaround.hpp" 86 #include "runtime/jniHandles.inline.hpp" 87 #include "runtime/os.inline.hpp" 88 #include "runtime/osThread.hpp" 89 #include "runtime/perfData.hpp" 90 #include "runtime/reflection.hpp" 91 #include "runtime/synchronizer.hpp" 92 #include "runtime/threadIdentifier.hpp" 93 #include "runtime/threadSMR.hpp" 94 #include "runtime/vframe.inline.hpp" 95 #include "runtime/vmOperations.hpp" 96 #include "runtime/vm_version.hpp" 97 #include "services/attachListener.hpp" 98 #include "services/management.hpp" 99 #include "services/threadService.hpp" 100 #include "utilities/checkedCast.hpp" 101 #include "utilities/copy.hpp" 102 #include "utilities/defaultStream.hpp" 103 #include "utilities/dtrace.hpp" 104 #include "utilities/events.hpp" 105 #include "utilities/macros.hpp" 106 #include "utilities/utf8.hpp" 107 #include "utilities/zipLibrary.hpp" 108 #if INCLUDE_CDS 109 #include "classfile/systemDictionaryShared.hpp" 110 #endif 111 #if INCLUDE_JFR 112 #include "jfr/jfr.hpp" 113 #endif 114 #if INCLUDE_MANAGEMENT 115 #include "services/finalizerService.hpp" 116 #endif 117 #ifdef LINUX 118 #include "osContainer_linux.hpp" 119 #endif 120 121 #include <errno.h> 122 123 /* 124 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 125 such ctors and calls MUST NOT come between an oop declaration/init and its 126 usage because if objects are move this may cause various memory stomps, bus 127 errors and segfaults. Here is a cookbook for causing so called "naked oop 128 failures": 129 130 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 131 // Object address to be held directly in mirror & not visible to GC 132 oop mirror = JNIHandles::resolve_non_null(ofClass); 133 134 // If this ctor can hit a safepoint, moving objects around, then 135 ComplexConstructor foo; 136 137 // Boom! mirror may point to JUNK instead of the intended object 138 (some dereference of mirror) 139 140 // Here's another call that may block for GC, making mirror stale 141 MutexLocker ml(some_lock); 142 143 // And here's an initializer that can result in a stale oop 144 // all in one step. 145 oop o = call_that_can_throw_exception(TRAPS); 146 147 148 The solution is to keep the oop declaration BELOW the ctor or function 149 call that might cause a GC, do another resolve to reassign the oop, or 150 consider use of a Handle instead of an oop so there is immunity from object 151 motion. But note that the "QUICK" entries below do not have a handlemark 152 and thus can only support use of handles passed in. 153 */ 154 155 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 156 ResourceMark rm; 157 int line_number = -1; 158 const char * source_file = nullptr; 159 const char * trace = "explicit"; 160 InstanceKlass* caller = nullptr; 161 JavaThread* jthread = THREAD; 162 if (jthread->has_last_Java_frame()) { 163 vframeStream vfst(jthread); 164 165 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 166 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController"); 167 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 168 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction"); 169 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 170 171 Method* last_caller = nullptr; 172 173 while (!vfst.at_end()) { 174 Method* m = vfst.method(); 175 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&& 176 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 177 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 178 break; 179 } 180 last_caller = m; 181 vfst.next(); 182 } 183 // if this is called from Class.forName0 and that is called from Class.forName, 184 // then print the caller of Class.forName. If this is Class.loadClass, then print 185 // that caller, otherwise keep quiet since this should be picked up elsewhere. 186 bool found_it = false; 187 if (!vfst.at_end() && 188 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 189 vfst.method()->name() == vmSymbols::forName0_name()) { 190 vfst.next(); 191 if (!vfst.at_end() && 192 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 193 vfst.method()->name() == vmSymbols::forName_name()) { 194 vfst.next(); 195 found_it = true; 196 } 197 } else if (last_caller != nullptr && 198 last_caller->method_holder()->name() == 199 vmSymbols::java_lang_ClassLoader() && 200 last_caller->name() == vmSymbols::loadClass_name()) { 201 found_it = true; 202 } else if (!vfst.at_end()) { 203 if (vfst.method()->is_native()) { 204 // JNI call 205 found_it = true; 206 } 207 } 208 if (found_it && !vfst.at_end()) { 209 // found the caller 210 caller = vfst.method()->method_holder(); 211 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 212 if (line_number == -1) { 213 // show method name if it's a native method 214 trace = vfst.method()->name_and_sig_as_C_string(); 215 } 216 Symbol* s = caller->source_file_name(); 217 if (s != nullptr) { 218 source_file = s->as_C_string(); 219 } 220 } 221 } 222 if (caller != nullptr) { 223 if (to_class != caller) { 224 const char * from = caller->external_name(); 225 const char * to = to_class->external_name(); 226 // print in a single call to reduce interleaving between threads 227 if (source_file != nullptr) { 228 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 229 } else { 230 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 231 } 232 } 233 } 234 } 235 236 void trace_class_resolution(Klass* to_class) { 237 EXCEPTION_MARK; 238 trace_class_resolution_impl(to_class, THREAD); 239 if (HAS_PENDING_EXCEPTION) { 240 CLEAR_PENDING_EXCEPTION; 241 } 242 } 243 244 // java.lang.System ////////////////////////////////////////////////////////////////////// 245 246 247 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 248 return os::javaTimeMillis(); 249 JVM_END 250 251 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 252 return os::javaTimeNanos(); 253 JVM_END 254 255 // The function below is actually exposed by jdk.internal.misc.VM and not 256 // java.lang.System, but we choose to keep it here so that it stays next 257 // to JVM_CurrentTimeMillis and JVM_NanoTime 258 259 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 260 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 261 262 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 263 jlong seconds; 264 jlong nanos; 265 266 os::javaTimeSystemUTC(seconds, nanos); 267 268 // We're going to verify that the result can fit in a long. 269 // For that we need the difference in seconds between 'seconds' 270 // and 'offset_secs' to be such that: 271 // |seconds - offset_secs| < (2^63/10^9) 272 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 273 // which makes |seconds - offset_secs| < 2^33 274 // and we will prefer +/- 2^32 as the maximum acceptable diff 275 // as 2^32 has a more natural feel than 2^33... 276 // 277 // So if |seconds - offset_secs| >= 2^32 - we return a special 278 // sentinel value (-1) which the caller should take as an 279 // exception value indicating that the offset given to us is 280 // too far from range of the current time - leading to too big 281 // a nano adjustment. The caller is expected to recover by 282 // computing a more accurate offset and calling this method 283 // again. (For the record 2^32 secs is ~136 years, so that 284 // should rarely happen) 285 // 286 jlong diff = seconds - offset_secs; 287 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 288 return -1; // sentinel value: the offset is too far off the target 289 } 290 291 // return the adjustment. If you compute a time by adding 292 // this number of nanoseconds along with the number of seconds 293 // in the offset you should get the current UTC time. 294 return (diff * (jlong)1000000000) + nanos; 295 JVM_END 296 297 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 298 jobject dst, jint dst_pos, jint length)) 299 // Check if we have null pointers 300 if (src == nullptr || dst == nullptr) { 301 THROW(vmSymbols::java_lang_NullPointerException()); 302 } 303 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 304 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 305 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 306 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 307 // Do copy 308 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 309 JVM_END 310 311 312 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 313 JavaValue r(T_OBJECT); 314 // public synchronized Object put(Object key, Object value); 315 HandleMark hm(THREAD); 316 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 317 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK); 318 JavaCalls::call_virtual(&r, 319 props, 320 vmClasses::Properties_klass(), 321 vmSymbols::put_name(), 322 vmSymbols::object_object_object_signature(), 323 key_str, 324 value_str, 325 THREAD); 326 } 327 328 329 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 330 331 /* 332 * Return all of the system properties in a Java String array with alternating 333 * names and values from the jvm SystemProperty. 334 * Which includes some internal and all commandline -D defined properties. 335 */ 336 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 337 ResourceMark rm(THREAD); 338 HandleMark hm(THREAD); 339 int ndx = 0; 340 int fixedCount = 2; 341 342 SystemProperty* p = Arguments::system_properties(); 343 int count = Arguments::PropertyList_count(p); 344 345 // Allocate result String array 346 InstanceKlass* ik = vmClasses::String_klass(); 347 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 348 objArrayHandle result_h(THREAD, r); 349 350 while (p != nullptr) { 351 const char * key = p->key(); 352 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 353 const char * value = p->value(); 354 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 355 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL); 356 result_h->obj_at_put(ndx * 2, key_str()); 357 result_h->obj_at_put(ndx * 2 + 1, value_str()); 358 ndx++; 359 } 360 p = p->next(); 361 } 362 363 // Convert the -XX:MaxDirectMemorySize= command line flag 364 // to the sun.nio.MaxDirectMemorySize property. 365 // Do this after setting user properties to prevent people 366 // from setting the value with a -D option, as requested. 367 // Leave empty if not supplied 368 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 369 char as_chars[256]; 370 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 371 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 372 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 373 result_h->obj_at_put(ndx * 2, key_str()); 374 result_h->obj_at_put(ndx * 2 + 1, value_str()); 375 ndx++; 376 } 377 378 // JVM monitoring and management support 379 // Add the sun.management.compiler property for the compiler's name 380 { 381 #undef CSIZE 382 #if defined(_LP64) || defined(_WIN64) 383 #define CSIZE "64-Bit " 384 #else 385 #define CSIZE 386 #endif // 64bit 387 388 #if COMPILER1_AND_COMPILER2 389 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 390 #else 391 #if defined(COMPILER1) 392 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 393 #elif defined(COMPILER2) 394 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 395 #elif INCLUDE_JVMCI 396 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2" 397 #else 398 const char* compiler_name = ""; 399 #endif // compilers 400 #endif // COMPILER1_AND_COMPILER2 401 402 if (*compiler_name != '\0' && 403 (Arguments::mode() != Arguments::_int)) { 404 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 405 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 406 result_h->obj_at_put(ndx * 2, key_str()); 407 result_h->obj_at_put(ndx * 2 + 1, value_str()); 408 ndx++; 409 } 410 } 411 412 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 413 JVM_END 414 415 416 /* 417 * Return the temporary directory that the VM uses for the attach 418 * and perf data files. 419 * 420 * It is important that this directory is well-known and the 421 * same for all VM instances. It cannot be affected by configuration 422 * variables such as java.io.tmpdir. 423 */ 424 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 425 HandleMark hm(THREAD); 426 const char* temp_dir = os::get_temp_directory(); 427 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 428 return (jstring) JNIHandles::make_local(THREAD, h()); 429 JVM_END 430 431 JVM_ENTRY(jarray, JVM_NewNullRestrictedArray(JNIEnv *env, jclass elmClass, jint len)) 432 if (len < 0) { 433 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative"); 434 } 435 oop mirror = JNIHandles::resolve_non_null(elmClass); 436 Klass* klass = java_lang_Class::as_Klass(mirror); 437 klass->initialize(CHECK_NULL); 438 if (klass->is_identity_class()) { 439 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class"); 440 } 441 if (klass->is_abstract()) { 442 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract"); 443 } 444 InlineKlass* vk = InlineKlass::cast(klass); 445 if (!vk->is_implicitly_constructible()) { 446 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not implicitly constructible"); 447 } 448 oop array = oopFactory::new_valueArray(vk, len, CHECK_NULL); 449 return (jarray) JNIHandles::make_local(THREAD, array); 450 JVM_END 451 452 453 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj)) 454 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj)); 455 return oop->is_null_free_array(); 456 JVM_END 457 458 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 459 460 extern volatile jint vm_created; 461 462 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 463 EventShutdown event; 464 if (event.should_commit()) { 465 event.set_reason("Shutdown requested from Java"); 466 event.commit(); 467 } 468 JVM_END 469 470 471 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 472 before_exit(thread, true); 473 vm_exit(code); 474 JVM_END 475 476 477 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 478 if (!DisableExplicitGC) { 479 EventSystemGC event; 480 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent); 481 Universe::heap()->collect(GCCause::_java_lang_system_gc); 482 event.commit(); 483 } 484 JVM_END 485 486 487 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 488 return Universe::heap()->millis_since_last_whole_heap_examined(); 489 JVM_END 490 491 492 static inline jlong convert_size_t_to_jlong(size_t val) { 493 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 494 NOT_LP64 (return (jlong)val;) 495 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 496 } 497 498 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 499 size_t n = Universe::heap()->capacity(); 500 return convert_size_t_to_jlong(n); 501 JVM_END 502 503 504 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 505 size_t n = Universe::heap()->unused(); 506 return convert_size_t_to_jlong(n); 507 JVM_END 508 509 510 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 511 size_t n = Universe::heap()->max_capacity(); 512 return convert_size_t_to_jlong(n); 513 JVM_END 514 515 516 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 517 return os::active_processor_count(); 518 JVM_END 519 520 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void)) 521 #ifdef LINUX 522 if (UseContainerSupport) { 523 return JNI_TRUE; 524 } 525 #endif 526 return JNI_FALSE; 527 JVM_END 528 529 JVM_LEAF(jboolean, JVM_IsContainerized(void)) 530 #ifdef LINUX 531 if (OSContainer::is_containerized()) { 532 return JNI_TRUE; 533 } 534 #endif 535 return JNI_FALSE; 536 JVM_END 537 538 // java.lang.Throwable ////////////////////////////////////////////////////// 539 540 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 541 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 542 java_lang_Throwable::fill_in_stack_trace(exception); 543 JVM_END 544 545 // java.lang.NullPointerException /////////////////////////////////////////// 546 547 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 548 if (!ShowCodeDetailsInExceptionMessages) return nullptr; 549 550 oop exc = JNIHandles::resolve_non_null(throwable); 551 552 Method* method; 553 int bci; 554 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 555 return nullptr; 556 } 557 if (method->is_native()) { 558 return nullptr; 559 } 560 561 stringStream ss; 562 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 563 if (ok) { 564 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 565 return (jstring) JNIHandles::make_local(THREAD, result); 566 } else { 567 return nullptr; 568 } 569 JVM_END 570 571 // java.lang.StackTraceElement ////////////////////////////////////////////// 572 573 574 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth)) 575 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace)); 576 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 577 objArrayHandle stack_trace(THREAD, st); 578 // Fill in the allocated stack trace 579 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK); 580 JVM_END 581 582 583 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 584 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 585 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 586 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK); 587 JVM_END 588 589 590 // java.lang.StackWalker ////////////////////////////////////////////////////// 591 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj)) 592 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj)); 593 594 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr); 595 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr); 596 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info()); 597 if (!have_name) { 598 oop name = StringTable::intern(method->name(), CHECK); 599 java_lang_StackFrameInfo::set_name(stack_frame_info(), name); 600 } 601 if (!have_type) { 602 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK); 603 java_lang_StackFrameInfo::set_type(stack_frame_info(), type()); 604 } 605 JVM_END 606 607 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode, 608 jint skip_frames, jobject contScope, jobject cont, 609 jint buffer_size, jint start_index, jobjectArray frames)) 610 if (!thread->has_last_Java_frame()) { 611 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr); 612 } 613 614 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 615 Handle contScope_h(THREAD, JNIHandles::resolve(contScope)); 616 Handle cont_h(THREAD, JNIHandles::resolve(cont)); 617 // frames array is a ClassFrameInfo[] array when only getting caller reference, 618 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 619 // be null. 620 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 621 objArrayHandle frames_array_h(THREAD, fa); 622 623 if (frames_array_h->length() < buffer_size) { 624 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr); 625 } 626 627 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h, 628 buffer_size, start_index, frames_array_h, CHECK_NULL); 629 return JNIHandles::make_local(THREAD, result); 630 JVM_END 631 632 633 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor, 634 jint last_batch_count, jint buffer_size, jint start_index, 635 jobjectArray frames)) 636 // frames array is a ClassFrameInfo[] array when only getting caller reference, 637 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 638 // be null. 639 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 640 objArrayHandle frames_array_h(THREAD, fa); 641 642 if (frames_array_h->length() < buffer_size) { 643 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 644 } 645 646 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 647 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size, 648 start_index, frames_array_h, THREAD); 649 JVM_END 650 651 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont)) 652 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 653 objArrayHandle frames_array_h(THREAD, fa); 654 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 655 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont)); 656 657 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD); 658 JVM_END 659 660 // java.lang.Object /////////////////////////////////////////////// 661 662 663 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 664 // as implemented in the classic virtual machine; return 0 if object is null 665 if (handle == nullptr) { 666 return 0; 667 } 668 oop obj = JNIHandles::resolve_non_null(handle); 669 if (EnableValhalla && obj->klass()->is_inline_klass()) { 670 JavaValue result(T_INT); 671 JavaCallArguments args; 672 Handle ho(THREAD, obj); 673 args.push_oop(ho); 674 methodHandle method(THREAD, Universe::value_object_hash_code_method()); 675 JavaCalls::call(&result, method, &args, THREAD); 676 if (HAS_PENDING_EXCEPTION) { 677 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) { 678 Handle e(THREAD, PENDING_EXCEPTION); 679 CLEAR_PENDING_EXCEPTION; 680 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false); 681 } 682 } 683 return result.get_jint(); 684 } else { 685 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj)); 686 } 687 JVM_END 688 689 690 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 691 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 692 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 693 if (JvmtiExport::should_post_monitor_wait()) { 694 JvmtiExport::post_monitor_wait(thread, obj(), ms); 695 696 // The current thread already owns the monitor and it has not yet 697 // been added to the wait queue so the current thread cannot be 698 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 699 // event handler cannot accidentally consume an unpark() meant for 700 // the ParkEvent associated with this ObjectMonitor. 701 } 702 ObjectSynchronizer::wait(obj, ms, CHECK); 703 JVM_END 704 705 706 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 707 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 708 ObjectSynchronizer::notify(obj, CHECK); 709 JVM_END 710 711 712 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 713 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 714 ObjectSynchronizer::notifyall(obj, CHECK); 715 JVM_END 716 717 718 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 719 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 720 Klass* klass = obj->klass(); 721 JvmtiVMObjectAllocEventCollector oam; 722 723 #ifdef ASSERT 724 // Just checking that the cloneable flag is set correct 725 if (obj->is_array()) { 726 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 727 } else { 728 guarantee(obj->is_instance(), "should be instanceOop"); 729 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 730 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 731 } 732 #endif 733 734 // Check if class of obj supports the Cloneable interface. 735 // All arrays are considered to be cloneable (See JLS 20.1.5). 736 // All j.l.r.Reference classes are considered non-cloneable. 737 if (!klass->is_cloneable() || 738 (klass->is_instance_klass() && 739 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 740 ResourceMark rm(THREAD); 741 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 742 } 743 744 if (klass->is_inline_klass()) { 745 // Value instances have no identity, so return the current instance instead of allocating a new one 746 // Value classes cannot have finalizers, so the method can return immediately 747 return JNIHandles::make_local(THREAD, obj()); 748 } 749 750 // Make shallow object copy 751 const size_t size = obj->size(); 752 oop new_obj_oop = nullptr; 753 if (obj->is_array()) { 754 const int length = ((arrayOop)obj())->length(); 755 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 756 /* do_zero */ true, CHECK_NULL); 757 } else { 758 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 759 } 760 761 HeapAccess<>::clone(obj(), new_obj_oop, size); 762 763 Handle new_obj(THREAD, new_obj_oop); 764 // Caution: this involves a java upcall, so the clone should be 765 // "gc-robust" by this stage. 766 if (klass->has_finalizer()) { 767 assert(obj->is_instance(), "should be instanceOop"); 768 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 769 new_obj = Handle(THREAD, new_obj_oop); 770 } 771 772 return JNIHandles::make_local(THREAD, new_obj()); 773 JVM_END 774 775 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 776 777 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 778 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 779 JVM_END 780 781 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 782 return InstanceKlass::is_finalization_enabled(); 783 JVM_END 784 785 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 786 787 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 788 CONT_RegisterNativeMethods(env, cls); 789 JVM_END 790 791 // java.io.File /////////////////////////////////////////////////////////////// 792 793 JVM_LEAF(char*, JVM_NativePath(char* path)) 794 return os::native_path(path); 795 JVM_END 796 797 798 // Misc. class handling /////////////////////////////////////////////////////////// 799 800 801 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 802 // Getting the class of the caller frame. 803 // 804 // The call stack at this point looks something like this: 805 // 806 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ] 807 // [1] [ @CallerSensitive API.method ] 808 // [.] [ (skipped intermediate frames) ] 809 // [n] [ caller ] 810 vframeStream vfst(thread); 811 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 812 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 813 Method* m = vfst.method(); 814 assert(m != nullptr, "sanity"); 815 switch (n) { 816 case 0: 817 // This must only be called from Reflection.getCallerClass 818 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 819 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 820 } 821 // fall-through 822 case 1: 823 // Frame 0 and 1 must be caller sensitive. 824 if (!m->caller_sensitive()) { 825 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 826 } 827 break; 828 default: 829 if (!m->is_ignored_by_security_stack_walk()) { 830 // We have reached the desired frame; return the holder class. 831 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 832 } 833 break; 834 } 835 } 836 return nullptr; 837 JVM_END 838 839 840 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 841 oop mirror = nullptr; 842 BasicType t = name2type(utf); 843 if (t != T_ILLEGAL && !is_reference_type(t)) { 844 mirror = Universe::java_mirror(t); 845 } 846 if (mirror == nullptr) { 847 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 848 } else { 849 return (jclass) JNIHandles::make_local(THREAD, mirror); 850 } 851 JVM_END 852 853 854 // Returns a class loaded by the bootstrap class loader; or null 855 // if not found. ClassNotFoundException is not thrown. 856 // FindClassFromBootLoader is exported to the launcher for windows. 857 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 858 const char* name)) 859 // Java libraries should ensure that name is never null or illegal. 860 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 861 // It's impossible to create this class; the name cannot fit 862 // into the constant pool. 863 return nullptr; 864 } 865 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name"); 866 867 TempNewSymbol h_name = SymbolTable::new_symbol(name); 868 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 869 if (k == nullptr) { 870 return nullptr; 871 } 872 873 if (log_is_enabled(Debug, class, resolve)) { 874 trace_class_resolution(k); 875 } 876 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 877 JVM_END 878 879 // Find a class with this name in this loader, using the caller's protection domain. 880 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 881 jboolean init, jobject loader, 882 jclass caller)) 883 TempNewSymbol h_name = 884 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 885 CHECK_NULL); 886 887 oop loader_oop = JNIHandles::resolve(loader); 888 oop from_class = JNIHandles::resolve(caller); 889 oop protection_domain = nullptr; 890 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 891 // NPE. Put it in another way, the bootstrap class loader has all permission and 892 // thus no checkPackageAccess equivalence in the VM class loader. 893 // The caller is also passed as null by the java code if there is no security 894 // manager to avoid the performance cost of getting the calling class. 895 if (from_class != nullptr && loader_oop != nullptr) { 896 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 897 } 898 899 Handle h_loader(THREAD, loader_oop); 900 Handle h_prot(THREAD, protection_domain); 901 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 902 h_prot, false, THREAD); 903 904 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 905 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 906 } 907 return result; 908 JVM_END 909 910 // Currently only called from the old verifier. 911 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 912 jboolean init, jclass from)) 913 TempNewSymbol h_name = 914 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 915 CHECK_NULL); 916 oop from_class_oop = JNIHandles::resolve(from); 917 Klass* from_class = (from_class_oop == nullptr) 918 ? (Klass*)nullptr 919 : java_lang_Class::as_Klass(from_class_oop); 920 oop class_loader = nullptr; 921 oop protection_domain = nullptr; 922 if (from_class != nullptr) { 923 class_loader = from_class->class_loader(); 924 protection_domain = from_class->protection_domain(); 925 } 926 Handle h_loader(THREAD, class_loader); 927 Handle h_prot (THREAD, protection_domain); 928 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 929 h_prot, true, thread); 930 931 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 932 // this function is generally only used for class loading during verification. 933 ResourceMark rm; 934 oop from_mirror = JNIHandles::resolve_non_null(from); 935 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 936 const char * from_name = from_class->external_name(); 937 938 oop mirror = JNIHandles::resolve_non_null(result); 939 Klass* to_class = java_lang_Class::as_Klass(mirror); 940 const char * to = to_class->external_name(); 941 log_debug(class, resolve)("%s %s (verification)", from_name, to); 942 } 943 944 return result; 945 JVM_END 946 947 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 948 static jclass jvm_define_class_common(const char *name, 949 jobject loader, const jbyte *buf, 950 jsize len, jobject pd, const char *source, 951 TRAPS) { 952 if (source == nullptr) source = "__JVM_DefineClass__"; 953 954 JavaThread* jt = THREAD; 955 956 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 957 ClassLoader::perf_define_appclass_selftime(), 958 ClassLoader::perf_define_appclasses(), 959 jt->get_thread_stat()->perf_recursion_counts_addr(), 960 jt->get_thread_stat()->perf_timers_addr(), 961 PerfClassTraceTime::DEFINE_CLASS); 962 963 if (UsePerfData) { 964 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 965 } 966 967 // Class resolution will get the class name from the .class stream if the name is null. 968 TempNewSymbol class_name = name == nullptr ? nullptr : 969 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 970 CHECK_NULL); 971 972 ResourceMark rm(THREAD); 973 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 974 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 975 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 976 ClassLoadInfo cl_info(protection_domain); 977 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 978 class_loader, 979 cl_info, 980 CHECK_NULL); 981 982 if (log_is_enabled(Debug, class, resolve)) { 983 trace_class_resolution(k); 984 } 985 986 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 987 } 988 989 enum { 990 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 991 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 992 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 993 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 994 }; 995 996 /* 997 * Define a class with the specified flags that indicates if it's a nestmate, 998 * hidden, or strongly referenced from class loader. 999 */ 1000 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 1001 const jbyte *buf, jsize len, jobject pd, 1002 jboolean init, int flags, jobject classData, TRAPS) { 1003 ResourceMark rm(THREAD); 1004 1005 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup)); 1006 // Lookup class must be a non-null instance 1007 if (lookup_k == nullptr) { 1008 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1009 } 1010 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass"); 1011 1012 Handle class_loader (THREAD, lookup_k->class_loader()); 1013 1014 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 1015 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1016 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1017 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1018 1019 InstanceKlass* host_class = nullptr; 1020 if (is_nestmate) { 1021 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL); 1022 } 1023 1024 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1025 name, 1026 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1027 is_nestmate ? host_class->external_name() : "", 1028 is_hidden ? "hidden" : "not hidden", 1029 is_strong ? "strong" : "weak", 1030 vm_annotations ? "with vm annotations" : "without vm annotation"); 1031 1032 if (!is_hidden) { 1033 // classData is only applicable for hidden classes 1034 if (classData != nullptr) { 1035 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1036 } 1037 if (is_nestmate) { 1038 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1039 } 1040 if (!is_strong) { 1041 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1042 } 1043 if (vm_annotations) { 1044 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1045 } 1046 if (flags != STRONG_LOADER_LINK) { 1047 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1048 err_msg("invalid flag 0x%x", flags)); 1049 } 1050 } 1051 1052 // Class resolution will get the class name from the .class stream if the name is null. 1053 TempNewSymbol class_name = name == nullptr ? nullptr : 1054 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1055 CHECK_NULL); 1056 1057 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1058 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1059 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 1060 1061 InstanceKlass* ik = nullptr; 1062 if (!is_hidden) { 1063 ClassLoadInfo cl_info(protection_domain); 1064 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1065 class_loader, 1066 cl_info, 1067 CHECK_NULL); 1068 1069 if (log_is_enabled(Debug, class, resolve)) { 1070 trace_class_resolution(ik); 1071 } 1072 } else { // hidden 1073 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1074 ClassLoadInfo cl_info(protection_domain, 1075 host_class, 1076 classData_h, 1077 is_hidden, 1078 is_strong, 1079 vm_annotations); 1080 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1081 class_loader, 1082 cl_info, 1083 CHECK_NULL); 1084 1085 // The hidden class loader data has been artificially been kept alive to 1086 // this point. The mirror and any instances of this class have to keep 1087 // it alive afterwards. 1088 ik->class_loader_data()->dec_keep_alive_ref_count(); 1089 1090 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1091 ModuleEntry* module = ik->module(); 1092 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1093 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1094 module_name, 1095 ik->external_name(), 1096 host_class->external_name(), 1097 ik->is_hidden() ? "is hidden" : "is not hidden"); 1098 } 1099 } 1100 1101 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) { 1102 // non-hidden class or nestmate class must be in the same package as the Lookup class 1103 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages"); 1104 } 1105 1106 if (init) { 1107 ik->initialize(CHECK_NULL); 1108 } else { 1109 ik->link_class(CHECK_NULL); 1110 } 1111 1112 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1113 } 1114 1115 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1116 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1117 JVM_END 1118 1119 /* 1120 * Define a class with the specified lookup class. 1121 * lookup: Lookup class 1122 * name: the name of the class 1123 * buf: class bytes 1124 * len: length of class bytes 1125 * pd: protection domain 1126 * init: initialize the class 1127 * flags: properties of the class 1128 * classData: private static pre-initialized field 1129 */ 1130 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1131 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1132 1133 if (lookup == nullptr) { 1134 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1135 } 1136 1137 assert(buf != nullptr, "buf must not be null"); 1138 1139 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1140 JVM_END 1141 1142 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1143 1144 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1145 JVM_END 1146 1147 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1148 ResourceMark rm(THREAD); 1149 1150 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1151 char* str = java_lang_String::as_utf8_string(h_name()); 1152 1153 // Sanity check, don't expect null 1154 if (str == nullptr) return nullptr; 1155 1156 // Internalize the string, converting '.' to '/' in string. 1157 char* p = (char*)str; 1158 while (*p != '\0') { 1159 if (*p == '.') { 1160 *p = '/'; 1161 } 1162 p++; 1163 } 1164 1165 const int str_len = (int)(p - str); 1166 if (str_len > Symbol::max_length()) { 1167 // It's impossible to create this class; the name cannot fit 1168 // into the constant pool. 1169 return nullptr; 1170 } 1171 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1172 1173 // Security Note: 1174 // The Java level wrapper will perform the necessary security check allowing 1175 // us to pass the null as the initiating class loader. 1176 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1177 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, 1178 h_loader, 1179 Handle()); 1180 #if INCLUDE_CDS 1181 if (k == nullptr) { 1182 // If the class is not already loaded, try to see if it's in the shared 1183 // archive for the current classloader (h_loader). 1184 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1185 } 1186 #endif 1187 return (k == nullptr) ? nullptr : 1188 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1189 JVM_END 1190 1191 // Module support ////////////////////////////////////////////////////////////////////////////// 1192 1193 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1194 jstring location, jobjectArray packages)) 1195 Handle h_module (THREAD, JNIHandles::resolve(module)); 1196 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1197 JVM_END 1198 1199 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1200 Handle h_module (THREAD, JNIHandles::resolve(module)); 1201 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1202 JVM_END 1203 1204 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1205 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1206 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1207 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1208 JVM_END 1209 1210 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1211 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1212 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1213 JVM_END 1214 1215 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1216 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1217 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1218 JVM_END 1219 1220 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1221 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1222 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1223 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1224 JVM_END 1225 1226 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1227 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1228 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1229 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1230 JVM_END 1231 1232 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1233 1234 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1235 assert (cls != nullptr, "illegal class"); 1236 JvmtiVMObjectAllocEventCollector oam; 1237 ResourceMark rm(THREAD); 1238 HandleMark hm(THREAD); 1239 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1240 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1241 return (jstring) JNIHandles::make_local(THREAD, result); 1242 JVM_END 1243 1244 1245 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1246 JvmtiVMObjectAllocEventCollector oam; 1247 oop mirror = JNIHandles::resolve_non_null(cls); 1248 1249 // Special handling for primitive objects 1250 if (java_lang_Class::is_primitive(mirror)) { 1251 // Primitive objects does not have any interfaces 1252 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1253 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1254 } 1255 1256 Klass* klass = java_lang_Class::as_Klass(mirror); 1257 // Figure size of result array 1258 int size; 1259 if (klass->is_instance_klass()) { 1260 InstanceKlass* ik = InstanceKlass::cast(klass); 1261 size = ik->local_interfaces()->length(); 1262 } else { 1263 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass"); 1264 size = 2; 1265 } 1266 1267 // Allocate result array 1268 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1269 objArrayHandle result (THREAD, r); 1270 // Fill in result 1271 if (klass->is_instance_klass()) { 1272 // Regular instance klass, fill in all local interfaces 1273 for (int index = 0; index < size; index++) { 1274 InstanceKlass* ik = InstanceKlass::cast(klass); 1275 Klass* k = ik->local_interfaces()->at(index); 1276 result->obj_at_put(index, k->java_mirror()); 1277 } 1278 } else { 1279 // All arrays implement java.lang.Cloneable and java.io.Serializable 1280 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1281 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1282 } 1283 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1284 JVM_END 1285 1286 1287 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1288 oop mirror = JNIHandles::resolve_non_null(cls); 1289 if (java_lang_Class::is_primitive(mirror)) { 1290 return JNI_FALSE; 1291 } 1292 Klass* k = java_lang_Class::as_Klass(mirror); 1293 jboolean result = k->is_interface(); 1294 assert(!result || k->is_instance_klass(), 1295 "all interfaces are instance types"); 1296 // The compiler intrinsic for isInterface tests the 1297 // Klass::_access_flags bits in the same way. 1298 return result; 1299 JVM_END 1300 1301 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1302 oop mirror = JNIHandles::resolve_non_null(cls); 1303 if (java_lang_Class::is_primitive(mirror)) { 1304 return JNI_FALSE; 1305 } 1306 Klass* k = java_lang_Class::as_Klass(mirror); 1307 return k->is_hidden(); 1308 JVM_END 1309 1310 JVM_ENTRY(jboolean, JVM_IsIdentityClass(JNIEnv *env, jclass cls)) 1311 oop mirror = JNIHandles::resolve_non_null(cls); 1312 if (java_lang_Class::is_primitive(mirror)) { 1313 return JNI_FALSE; 1314 } 1315 Klass* k = java_lang_Class::as_Klass(mirror); 1316 if (EnableValhalla) { 1317 return k->is_array_klass() || k->is_identity_class(); 1318 } else { 1319 return k->is_interface() ? JNI_FALSE : JNI_TRUE; 1320 } 1321 JVM_END 1322 1323 JVM_ENTRY(jboolean, JVM_IsImplicitlyConstructibleClass(JNIEnv *env, jclass cls)) 1324 oop mirror = JNIHandles::resolve_non_null(cls); 1325 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1326 return ik->is_implicitly_constructible(); 1327 JVM_END 1328 1329 1330 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1331 oop mirror = JNIHandles::resolve_non_null(cls); 1332 if (mirror == nullptr) { 1333 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 1334 } 1335 1336 if (java_lang_Class::is_primitive(mirror)) { 1337 // Primitive types does not have a protection domain. 1338 return nullptr; 1339 } 1340 1341 oop pd = java_lang_Class::protection_domain(mirror); 1342 return (jobject) JNIHandles::make_local(THREAD, pd); 1343 JVM_END 1344 1345 1346 // Returns the inherited_access_control_context field of the running thread. 1347 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1348 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1349 return JNIHandles::make_local(THREAD, result); 1350 JVM_END 1351 1352 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1353 if (!UsePrivilegedStack) return nullptr; 1354 1355 ResourceMark rm(THREAD); 1356 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1357 JvmtiVMObjectAllocEventCollector oam; 1358 1359 // count the protection domains on the execution stack. We collapse 1360 // duplicate consecutive protection domains into a single one, as 1361 // well as stopping when we hit a privileged frame. 1362 1363 oop previous_protection_domain = nullptr; 1364 Handle privileged_context(thread, nullptr); 1365 bool is_privileged = false; 1366 oop protection_domain = nullptr; 1367 1368 // Iterate through Java frames 1369 vframeStream vfst(thread); 1370 for(; !vfst.at_end(); vfst.next()) { 1371 // get method of frame 1372 Method* method = vfst.method(); 1373 1374 // stop at the first privileged frame 1375 if (method->method_holder() == vmClasses::AccessController_klass() && 1376 method->name() == vmSymbols::executePrivileged_name()) 1377 { 1378 // this frame is privileged 1379 is_privileged = true; 1380 1381 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1382 1383 StackValueCollection* locals = priv->locals(); 1384 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1385 StackValue* clr_sv = locals->at(2); // Class<?> caller 1386 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1387 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1388 privileged_context = ctx_sv->get_obj(); 1389 Handle caller = clr_sv->get_obj(); 1390 1391 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1392 protection_domain = caller_klass->protection_domain(); 1393 } else { 1394 protection_domain = method->method_holder()->protection_domain(); 1395 } 1396 1397 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) { 1398 local_array->push(Handle(thread, protection_domain)); 1399 previous_protection_domain = protection_domain; 1400 } 1401 1402 if (is_privileged) break; 1403 } 1404 1405 1406 // either all the domains on the stack were system domains, or 1407 // we had a privileged system domain 1408 if (local_array->is_empty()) { 1409 if (is_privileged && privileged_context.is_null()) return nullptr; 1410 1411 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1412 return JNIHandles::make_local(THREAD, result); 1413 } 1414 1415 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(), 1416 local_array->length(), CHECK_NULL); 1417 objArrayHandle h_context(thread, context); 1418 for (int index = 0; index < local_array->length(); index++) { 1419 h_context->obj_at_put(index, local_array->at(index)()); 1420 } 1421 1422 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1423 1424 return JNIHandles::make_local(THREAD, result); 1425 JVM_END 1426 1427 class ScopedValueBindingsResolver { 1428 public: 1429 InstanceKlass* Carrier_klass; 1430 ScopedValueBindingsResolver(JavaThread* THREAD) { 1431 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD); 1432 Carrier_klass = InstanceKlass::cast(k); 1433 } 1434 }; 1435 1436 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1437 ResourceMark rm(THREAD); 1438 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1439 JvmtiVMObjectAllocEventCollector oam; 1440 1441 static ScopedValueBindingsResolver resolver(THREAD); 1442 1443 // Iterate through Java frames 1444 vframeStream vfst(thread); 1445 for(; !vfst.at_end(); vfst.next()) { 1446 int loc = -1; 1447 // get method of frame 1448 Method* method = vfst.method(); 1449 1450 Symbol *name = method->name(); 1451 1452 InstanceKlass* holder = method->method_holder(); 1453 if (name == vmSymbols::runWith_method_name()) { 1454 if (holder == vmClasses::Thread_klass() 1455 || holder == resolver.Carrier_klass) { 1456 loc = 1; 1457 } 1458 } 1459 1460 if (loc != -1) { 1461 javaVFrame *frame = vfst.asJavaVFrame(); 1462 StackValueCollection* locals = frame->locals(); 1463 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot 1464 Handle result = head_sv->get_obj(); 1465 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1466 if (result() != nullptr) { 1467 return JNIHandles::make_local(THREAD, result()); 1468 } 1469 } 1470 } 1471 1472 return nullptr; 1473 JVM_END 1474 1475 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1476 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1477 return (k != nullptr) && k->is_array_klass() ? true : false; 1478 JVM_END 1479 1480 1481 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1482 oop mirror = JNIHandles::resolve_non_null(cls); 1483 return (jboolean) java_lang_Class::is_primitive(mirror); 1484 JVM_END 1485 1486 1487 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1488 oop mirror = JNIHandles::resolve_non_null(cls); 1489 if (java_lang_Class::is_primitive(mirror)) { 1490 // Primitive type 1491 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1492 } 1493 1494 Klass* k = java_lang_Class::as_Klass(mirror); 1495 debug_only(int computed_modifiers = k->compute_modifier_flags()); 1496 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1497 return k->modifier_flags(); 1498 JVM_END 1499 1500 1501 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1502 1503 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1504 JvmtiVMObjectAllocEventCollector oam; 1505 // ofClass is a reference to a java_lang_Class object. The mirror object 1506 // of an InstanceKlass 1507 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1508 if (java_lang_Class::is_primitive(ofMirror) || 1509 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1510 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1511 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1512 } 1513 1514 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1515 InnerClassesIterator iter(k); 1516 1517 if (iter.length() == 0) { 1518 // Neither an inner nor outer class 1519 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1520 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1521 } 1522 1523 // find inner class info 1524 constantPoolHandle cp(thread, k->constants()); 1525 int length = iter.length(); 1526 1527 // Allocate temp. result array 1528 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL); 1529 objArrayHandle result (THREAD, r); 1530 int members = 0; 1531 1532 for (; !iter.done(); iter.next()) { 1533 int ioff = iter.inner_class_info_index(); 1534 int ooff = iter.outer_class_info_index(); 1535 1536 if (ioff != 0 && ooff != 0) { 1537 // Check to see if the name matches the class we're looking for 1538 // before attempting to find the class. 1539 if (cp->klass_name_at_matches(k, ooff)) { 1540 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1541 if (outer_klass == k) { 1542 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1543 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1544 1545 // Throws an exception if outer klass has not declared k as 1546 // an inner klass 1547 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1548 1549 result->obj_at_put(members, inner_klass->java_mirror()); 1550 members++; 1551 } 1552 } 1553 } 1554 } 1555 1556 if (members != length) { 1557 // Return array of right length 1558 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL); 1559 for(int i = 0; i < members; i++) { 1560 res->obj_at_put(i, result->obj_at(i)); 1561 } 1562 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1563 } 1564 1565 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1566 JVM_END 1567 1568 1569 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1570 { 1571 // ofClass is a reference to a java_lang_Class object. 1572 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1573 if (java_lang_Class::is_primitive(ofMirror)) { 1574 return nullptr; 1575 } 1576 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1577 if (!klass->is_instance_klass()) { 1578 return nullptr; 1579 } 1580 1581 bool inner_is_member = false; 1582 Klass* outer_klass 1583 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1584 if (outer_klass == nullptr) return nullptr; // already a top-level class 1585 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1586 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1587 } 1588 JVM_END 1589 1590 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1591 { 1592 oop mirror = JNIHandles::resolve_non_null(cls); 1593 if (java_lang_Class::is_primitive(mirror)) { 1594 return nullptr; 1595 } 1596 Klass* klass = java_lang_Class::as_Klass(mirror); 1597 if (!klass->is_instance_klass()) { 1598 return nullptr; 1599 } 1600 InstanceKlass* k = InstanceKlass::cast(klass); 1601 int ooff = 0, noff = 0; 1602 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1603 if (noff != 0) { 1604 constantPoolHandle i_cp(thread, k->constants()); 1605 Symbol* name = i_cp->symbol_at(noff); 1606 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1607 return (jstring) JNIHandles::make_local(THREAD, str()); 1608 } 1609 } 1610 return nullptr; 1611 } 1612 JVM_END 1613 1614 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1615 assert (cls != nullptr, "illegal class"); 1616 JvmtiVMObjectAllocEventCollector oam; 1617 ResourceMark rm(THREAD); 1618 oop mirror = JNIHandles::resolve_non_null(cls); 1619 // Return null for arrays and primitives 1620 if (!java_lang_Class::is_primitive(mirror)) { 1621 Klass* k = java_lang_Class::as_Klass(mirror); 1622 if (k->is_instance_klass()) { 1623 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1624 if (sym == nullptr) return nullptr; 1625 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1626 return (jstring) JNIHandles::make_local(THREAD, str()); 1627 } 1628 } 1629 return nullptr; 1630 JVM_END 1631 1632 1633 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1634 assert (cls != nullptr, "illegal class"); 1635 oop mirror = JNIHandles::resolve_non_null(cls); 1636 // Return null for arrays and primitives 1637 if (!java_lang_Class::is_primitive(mirror)) { 1638 Klass* k = java_lang_Class::as_Klass(mirror); 1639 if (k->is_instance_klass()) { 1640 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1641 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1642 } 1643 } 1644 return nullptr; 1645 JVM_END 1646 1647 1648 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1649 // some of this code was adapted from from jni_FromReflectedField 1650 1651 oop reflected = JNIHandles::resolve_non_null(field); 1652 oop mirror = java_lang_reflect_Field::clazz(reflected); 1653 Klass* k = java_lang_Class::as_Klass(mirror); 1654 int slot = java_lang_reflect_Field::slot(reflected); 1655 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1656 1657 InstanceKlass* ik = InstanceKlass::cast(k); 1658 int offset = ik->field_offset(slot); 1659 1660 if (modifiers & JVM_ACC_STATIC) { 1661 // for static fields we only look in the current class 1662 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1663 assert(false, "cannot find static field"); 1664 return false; 1665 } 1666 } else { 1667 // for instance fields we start with the current class and work 1668 // our way up through the superclass chain 1669 if (!ik->find_field_from_offset(offset, false, &fd)) { 1670 assert(false, "cannot find instance field"); 1671 return false; 1672 } 1673 } 1674 return true; 1675 } 1676 1677 static Method* jvm_get_method_common(jobject method) { 1678 // some of this code was adapted from from jni_FromReflectedMethod 1679 1680 oop reflected = JNIHandles::resolve_non_null(method); 1681 oop mirror = nullptr; 1682 int slot = 0; 1683 1684 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1685 mirror = java_lang_reflect_Constructor::clazz(reflected); 1686 slot = java_lang_reflect_Constructor::slot(reflected); 1687 } else { 1688 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1689 "wrong type"); 1690 mirror = java_lang_reflect_Method::clazz(reflected); 1691 slot = java_lang_reflect_Method::slot(reflected); 1692 } 1693 Klass* k = java_lang_Class::as_Klass(mirror); 1694 1695 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1696 assert(m != nullptr, "cannot find method"); 1697 return m; // caller has to deal with null in product mode 1698 } 1699 1700 /* Type use annotations support (JDK 1.8) */ 1701 1702 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1703 assert (cls != nullptr, "illegal class"); 1704 ResourceMark rm(THREAD); 1705 // Return null for arrays and primitives 1706 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1707 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1708 if (k->is_instance_klass()) { 1709 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1710 if (type_annotations != nullptr) { 1711 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1712 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1713 } 1714 } 1715 } 1716 return nullptr; 1717 JVM_END 1718 1719 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1720 assert (method != nullptr, "illegal method"); 1721 // method is a handle to a java.lang.reflect.Method object 1722 Method* m = jvm_get_method_common(method); 1723 if (m == nullptr) { 1724 return nullptr; 1725 } 1726 1727 AnnotationArray* type_annotations = m->type_annotations(); 1728 if (type_annotations != nullptr) { 1729 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1730 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1731 } 1732 1733 return nullptr; 1734 JVM_END 1735 1736 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1737 assert (field != nullptr, "illegal field"); 1738 fieldDescriptor fd; 1739 bool gotFd = jvm_get_field_common(field, fd); 1740 if (!gotFd) { 1741 return nullptr; 1742 } 1743 1744 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1745 JVM_END 1746 1747 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1748 if (!cp->is_within_bounds(index)) { 1749 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1750 } 1751 } 1752 1753 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1754 { 1755 // method is a handle to a java.lang.reflect.Method object 1756 Method* method_ptr = jvm_get_method_common(method); 1757 methodHandle mh (THREAD, method_ptr); 1758 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1759 const int num_params = mh->method_parameters_length(); 1760 1761 if (num_params < 0) { 1762 // A -1 return value from method_parameters_length means there is no 1763 // parameter data. Return null to indicate this to the reflection 1764 // API. 1765 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1766 return (jobjectArray)nullptr; 1767 } else { 1768 // Otherwise, we return something up to reflection, even if it is 1769 // a zero-length array. Why? Because in some cases this can 1770 // trigger a MalformedParametersException. 1771 1772 // make sure all the symbols are properly formatted 1773 for (int i = 0; i < num_params; i++) { 1774 MethodParametersElement* params = mh->method_parameters_start(); 1775 int index = params[i].name_cp_index; 1776 constantPoolHandle cp(THREAD, mh->constants()); 1777 bounds_check(cp, index, CHECK_NULL); 1778 1779 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1780 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1781 "Wrong type at constant pool index"); 1782 } 1783 1784 } 1785 1786 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1787 objArrayHandle result (THREAD, result_oop); 1788 1789 for (int i = 0; i < num_params; i++) { 1790 MethodParametersElement* params = mh->method_parameters_start(); 1791 // For a 0 index, give a null symbol 1792 Symbol* sym = 0 != params[i].name_cp_index ? 1793 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1794 int flags = params[i].flags; 1795 oop param = Reflection::new_parameter(reflected_method, i, sym, 1796 flags, CHECK_NULL); 1797 result->obj_at_put(i, param); 1798 } 1799 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1800 } 1801 } 1802 JVM_END 1803 1804 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1805 1806 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1807 { 1808 JvmtiVMObjectAllocEventCollector oam; 1809 1810 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1811 // Exclude primitive types and array types 1812 if (java_lang_Class::is_primitive(ofMirror) || 1813 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1814 // Return empty array 1815 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1816 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1817 } 1818 1819 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1820 constantPoolHandle cp(THREAD, k->constants()); 1821 1822 // Ensure class is linked 1823 k->link_class(CHECK_NULL); 1824 1825 // Allocate result 1826 int num_fields; 1827 1828 if (publicOnly) { 1829 num_fields = 0; 1830 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1831 if (fs.access_flags().is_public()) ++num_fields; 1832 } 1833 } else { 1834 num_fields = k->java_fields_count(); 1835 } 1836 1837 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1838 objArrayHandle result (THREAD, r); 1839 1840 int out_idx = 0; 1841 fieldDescriptor fd; 1842 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1843 if (!publicOnly || fs.access_flags().is_public()) { 1844 fd.reinitialize(k, fs.index()); 1845 oop field = Reflection::new_field(&fd, CHECK_NULL); 1846 result->obj_at_put(out_idx, field); 1847 ++out_idx; 1848 } 1849 } 1850 assert(out_idx == num_fields, "just checking"); 1851 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1852 } 1853 JVM_END 1854 1855 // A class is a record if and only if it is final and a direct subclass of 1856 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1857 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1858 { 1859 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1860 if (k != nullptr && k->is_instance_klass()) { 1861 InstanceKlass* ik = InstanceKlass::cast(k); 1862 return ik->is_record(); 1863 } else { 1864 return false; 1865 } 1866 } 1867 JVM_END 1868 1869 // Returns an array containing the components of the Record attribute, 1870 // or null if the attribute is not present. 1871 // 1872 // Note that this function returns the components of the Record attribute 1873 // even if the class is not a record. 1874 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1875 { 1876 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1877 assert(c->is_instance_klass(), "must be"); 1878 InstanceKlass* ik = InstanceKlass::cast(c); 1879 1880 Array<RecordComponent*>* components = ik->record_components(); 1881 if (components != nullptr) { 1882 JvmtiVMObjectAllocEventCollector oam; 1883 constantPoolHandle cp(THREAD, ik->constants()); 1884 int length = components->length(); 1885 assert(length >= 0, "unexpected record_components length"); 1886 objArrayOop record_components = 1887 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1888 objArrayHandle components_h (THREAD, record_components); 1889 1890 for (int x = 0; x < length; x++) { 1891 RecordComponent* component = components->at(x); 1892 assert(component != nullptr, "unexpected null record component"); 1893 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1894 components_h->obj_at_put(x, component_oop); 1895 } 1896 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1897 } 1898 1899 return nullptr; 1900 } 1901 JVM_END 1902 1903 static jobjectArray get_class_declared_methods_helper( 1904 JNIEnv *env, 1905 jclass ofClass, jboolean publicOnly, 1906 bool want_constructor, 1907 Klass* klass, TRAPS) { 1908 1909 JvmtiVMObjectAllocEventCollector oam; 1910 1911 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1912 // Exclude primitive types and array types 1913 if (java_lang_Class::is_primitive(ofMirror) 1914 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1915 // Return empty array 1916 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1917 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1918 } 1919 1920 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1921 1922 // Ensure class is linked 1923 k->link_class(CHECK_NULL); 1924 1925 Array<Method*>* methods = k->methods(); 1926 int methods_length = methods->length(); 1927 1928 // Save original method_idnum in case of redefinition, which can change 1929 // the idnum of obsolete methods. The new method will have the same idnum 1930 // but if we refresh the methods array, the counts will be wrong. 1931 ResourceMark rm(THREAD); 1932 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1933 int num_methods = 0; 1934 1935 // Select methods matching the criteria. 1936 for (int i = 0; i < methods_length; i++) { 1937 Method* method = methods->at(i); 1938 if (want_constructor && !method->is_object_constructor()) { 1939 continue; 1940 } 1941 if (!want_constructor && 1942 (method->is_object_constructor() || method->is_class_initializer() || 1943 method->is_overpass())) { 1944 continue; 1945 } 1946 if (publicOnly && !method->is_public()) { 1947 continue; 1948 } 1949 idnums->push(method->method_idnum()); 1950 ++num_methods; 1951 } 1952 1953 // Allocate result 1954 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1955 objArrayHandle result (THREAD, r); 1956 1957 // Now just put the methods that we selected above, but go by their idnum 1958 // in case of redefinition. The methods can be redefined at any safepoint, 1959 // so above when allocating the oop array and below when creating reflect 1960 // objects. 1961 for (int i = 0; i < num_methods; i++) { 1962 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1963 if (method.is_null()) { 1964 // Method may have been deleted and seems this API can handle null 1965 // Otherwise should probably put a method that throws NSME 1966 result->obj_at_put(i, nullptr); 1967 } else { 1968 oop m; 1969 if (want_constructor) { 1970 assert(method->is_object_constructor(), "must be"); 1971 m = Reflection::new_constructor(method, CHECK_NULL); 1972 } else { 1973 m = Reflection::new_method(method, false, CHECK_NULL); 1974 } 1975 result->obj_at_put(i, m); 1976 } 1977 } 1978 1979 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1980 } 1981 1982 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1983 { 1984 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1985 /*want_constructor*/ false, 1986 vmClasses::reflect_Method_klass(), THREAD); 1987 } 1988 JVM_END 1989 1990 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1991 { 1992 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1993 /*want_constructor*/ true, 1994 vmClasses::reflect_Constructor_klass(), THREAD); 1995 } 1996 JVM_END 1997 1998 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1999 { 2000 oop mirror = JNIHandles::resolve_non_null(cls); 2001 if (java_lang_Class::is_primitive(mirror)) { 2002 // Primitive type 2003 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 2004 } 2005 2006 Klass* k = java_lang_Class::as_Klass(mirror); 2007 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 2008 } 2009 JVM_END 2010 2011 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 2012 { 2013 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2014 assert(c->is_instance_klass(), "must be"); 2015 InstanceKlass* ck = InstanceKlass::cast(c); 2016 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 2017 assert(m->is_instance_klass(), "must be"); 2018 InstanceKlass* mk = InstanceKlass::cast(m); 2019 return ck->has_nestmate_access_to(mk, THREAD); 2020 } 2021 JVM_END 2022 2023 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 2024 { 2025 // current is not a primitive or array class 2026 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2027 assert(c->is_instance_klass(), "must be"); 2028 InstanceKlass* ck = InstanceKlass::cast(c); 2029 InstanceKlass* host = ck->nest_host(THREAD); 2030 return (jclass) (host == nullptr ? nullptr : 2031 JNIHandles::make_local(THREAD, host->java_mirror())); 2032 } 2033 JVM_END 2034 2035 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 2036 { 2037 // current is not a primitive or array class 2038 ResourceMark rm(THREAD); 2039 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2040 assert(c->is_instance_klass(), "must be"); 2041 InstanceKlass* ck = InstanceKlass::cast(c); 2042 InstanceKlass* host = ck->nest_host(THREAD); 2043 2044 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 2045 ck->external_name(), host->external_name()); 2046 { 2047 JvmtiVMObjectAllocEventCollector oam; 2048 Array<u2>* members = host->nest_members(); 2049 int length = members == nullptr ? 0 : members->length(); 2050 2051 log_trace(class, nestmates)(" - host has %d listed nest members", length); 2052 2053 // nest host is first in the array so make it one bigger 2054 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2055 length + 1, CHECK_NULL); 2056 objArrayHandle result(THREAD, r); 2057 result->obj_at_put(0, host->java_mirror()); 2058 if (length != 0) { 2059 int count = 0; 2060 for (int i = 0; i < length; i++) { 2061 int cp_index = members->at(i); 2062 Klass* k = host->constants()->klass_at(cp_index, THREAD); 2063 if (HAS_PENDING_EXCEPTION) { 2064 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2065 return nullptr; // propagate VMEs 2066 } 2067 if (log_is_enabled(Trace, class, nestmates)) { 2068 stringStream ss; 2069 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2070 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2071 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2072 log_trace(class, nestmates)("%s", ss.as_string()); 2073 } 2074 CLEAR_PENDING_EXCEPTION; 2075 continue; 2076 } 2077 if (k->is_instance_klass()) { 2078 InstanceKlass* ik = InstanceKlass::cast(k); 2079 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2080 if (nest_host_k == host) { 2081 result->obj_at_put(count+1, k->java_mirror()); 2082 count++; 2083 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2084 } else { 2085 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2086 ik->external_name(), nest_host_k->external_name()); 2087 } 2088 } else { 2089 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2090 k->external_name()); 2091 } 2092 } 2093 if (count < length) { 2094 // we had invalid entries so we need to compact the array 2095 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2096 length + 1, count + 1); 2097 2098 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2099 count + 1, CHECK_NULL); 2100 objArrayHandle result2(THREAD, r2); 2101 for (int i = 0; i < count + 1; i++) { 2102 result2->obj_at_put(i, result->obj_at(i)); 2103 } 2104 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2105 } 2106 } 2107 else { 2108 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate"); 2109 } 2110 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2111 } 2112 } 2113 JVM_END 2114 2115 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2116 { 2117 oop mirror = JNIHandles::resolve_non_null(current); 2118 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2119 Klass* c = java_lang_Class::as_Klass(mirror); 2120 assert(c->is_instance_klass(), "must be"); 2121 InstanceKlass* ik = InstanceKlass::cast(c); 2122 ResourceMark rm(THREAD); 2123 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2124 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2125 if (ik->is_sealed()) { 2126 JvmtiVMObjectAllocEventCollector oam; 2127 Array<u2>* subclasses = ik->permitted_subclasses(); 2128 int length = subclasses->length(); 2129 2130 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2131 2132 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2133 length, CHECK_NULL); 2134 objArrayHandle result(THREAD, r); 2135 int count = 0; 2136 for (int i = 0; i < length; i++) { 2137 int cp_index = subclasses->at(i); 2138 Klass* k = ik->constants()->klass_at(cp_index, THREAD); 2139 if (HAS_PENDING_EXCEPTION) { 2140 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2141 return nullptr; // propagate VMEs 2142 } 2143 if (log_is_enabled(Trace, class, sealed)) { 2144 stringStream ss; 2145 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2146 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2147 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2148 log_trace(class, sealed)("%s", ss.as_string()); 2149 } 2150 2151 CLEAR_PENDING_EXCEPTION; 2152 continue; 2153 } 2154 if (k->is_instance_klass()) { 2155 result->obj_at_put(count++, k->java_mirror()); 2156 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2157 } 2158 } 2159 if (count < length) { 2160 // we had invalid entries so we need to compact the array 2161 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2162 count, CHECK_NULL); 2163 objArrayHandle result2(THREAD, r2); 2164 for (int i = 0; i < count; i++) { 2165 result2->obj_at_put(i, result->obj_at(i)); 2166 } 2167 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2168 } 2169 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2170 } else { 2171 return nullptr; 2172 } 2173 } 2174 JVM_END 2175 2176 // Constant pool access ////////////////////////////////////////////////////////// 2177 2178 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2179 { 2180 JvmtiVMObjectAllocEventCollector oam; 2181 oop mirror = JNIHandles::resolve_non_null(cls); 2182 // Return null for primitives and arrays 2183 if (!java_lang_Class::is_primitive(mirror)) { 2184 Klass* k = java_lang_Class::as_Klass(mirror); 2185 if (k->is_instance_klass()) { 2186 InstanceKlass* k_h = InstanceKlass::cast(k); 2187 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2188 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2189 return JNIHandles::make_local(THREAD, jcp()); 2190 } 2191 } 2192 return nullptr; 2193 } 2194 JVM_END 2195 2196 2197 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2198 { 2199 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2200 return cp->length(); 2201 } 2202 JVM_END 2203 2204 2205 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2206 { 2207 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2208 bounds_check(cp, index, CHECK_NULL); 2209 constantTag tag = cp->tag_at(index); 2210 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2211 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2212 } 2213 Klass* k = cp->klass_at(index, CHECK_NULL); 2214 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2215 } 2216 JVM_END 2217 2218 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2219 { 2220 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2221 bounds_check(cp, index, CHECK_NULL); 2222 constantTag tag = cp->tag_at(index); 2223 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2224 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2225 } 2226 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2227 if (k == nullptr) return nullptr; 2228 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2229 } 2230 JVM_END 2231 2232 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2233 constantTag tag = cp->tag_at(index); 2234 if (!tag.is_method() && !tag.is_interface_method()) { 2235 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2236 } 2237 int klass_ref = cp->uncached_klass_ref_index_at(index); 2238 Klass* k_o; 2239 if (force_resolution) { 2240 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2241 } else { 2242 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2243 if (k_o == nullptr) return nullptr; 2244 } 2245 InstanceKlass* k = InstanceKlass::cast(k_o); 2246 Symbol* name = cp->uncached_name_ref_at(index); 2247 Symbol* sig = cp->uncached_signature_ref_at(index); 2248 methodHandle m (THREAD, k->find_method(name, sig)); 2249 if (m.is_null()) { 2250 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2251 } 2252 oop method; 2253 if (m->is_object_constructor()) { 2254 method = Reflection::new_constructor(m, CHECK_NULL); 2255 } else { 2256 method = Reflection::new_method(m, true, CHECK_NULL); 2257 } 2258 return JNIHandles::make_local(THREAD, method); 2259 } 2260 2261 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2262 { 2263 JvmtiVMObjectAllocEventCollector oam; 2264 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2265 bounds_check(cp, index, CHECK_NULL); 2266 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2267 return res; 2268 } 2269 JVM_END 2270 2271 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2272 { 2273 JvmtiVMObjectAllocEventCollector oam; 2274 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2275 bounds_check(cp, index, CHECK_NULL); 2276 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2277 return res; 2278 } 2279 JVM_END 2280 2281 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2282 constantTag tag = cp->tag_at(index); 2283 if (!tag.is_field()) { 2284 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2285 } 2286 int klass_ref = cp->uncached_klass_ref_index_at(index); 2287 Klass* k_o; 2288 if (force_resolution) { 2289 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2290 } else { 2291 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2292 if (k_o == nullptr) return nullptr; 2293 } 2294 InstanceKlass* k = InstanceKlass::cast(k_o); 2295 Symbol* name = cp->uncached_name_ref_at(index); 2296 Symbol* sig = cp->uncached_signature_ref_at(index); 2297 fieldDescriptor fd; 2298 Klass* target_klass = k->find_field(name, sig, &fd); 2299 if (target_klass == nullptr) { 2300 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2301 } 2302 oop field = Reflection::new_field(&fd, CHECK_NULL); 2303 return JNIHandles::make_local(THREAD, field); 2304 } 2305 2306 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2307 { 2308 JvmtiVMObjectAllocEventCollector oam; 2309 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2310 bounds_check(cp, index, CHECK_NULL); 2311 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2312 return res; 2313 } 2314 JVM_END 2315 2316 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2317 { 2318 JvmtiVMObjectAllocEventCollector oam; 2319 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2320 bounds_check(cp, index, CHECK_NULL); 2321 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2322 return res; 2323 } 2324 JVM_END 2325 2326 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2327 { 2328 JvmtiVMObjectAllocEventCollector oam; 2329 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2330 bounds_check(cp, index, CHECK_NULL); 2331 constantTag tag = cp->tag_at(index); 2332 if (!tag.is_field_or_method()) { 2333 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2334 } 2335 int klass_ref = cp->uncached_klass_ref_index_at(index); 2336 Symbol* klass_name = cp->klass_name_at(klass_ref); 2337 Symbol* member_name = cp->uncached_name_ref_at(index); 2338 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2339 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2340 objArrayHandle dest(THREAD, dest_o); 2341 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2342 dest->obj_at_put(0, str()); 2343 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2344 dest->obj_at_put(1, str()); 2345 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2346 dest->obj_at_put(2, str()); 2347 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2348 } 2349 JVM_END 2350 2351 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2352 { 2353 JvmtiVMObjectAllocEventCollector oam; 2354 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2355 bounds_check(cp, index, CHECK_0); 2356 constantTag tag = cp->tag_at(index); 2357 if (!tag.is_field_or_method()) { 2358 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2359 } 2360 return (jint) cp->uncached_klass_ref_index_at(index); 2361 } 2362 JVM_END 2363 2364 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2365 { 2366 JvmtiVMObjectAllocEventCollector oam; 2367 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2368 bounds_check(cp, index, CHECK_0); 2369 constantTag tag = cp->tag_at(index); 2370 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2371 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2372 } 2373 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2374 } 2375 JVM_END 2376 2377 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2378 { 2379 JvmtiVMObjectAllocEventCollector oam; 2380 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2381 bounds_check(cp, index, CHECK_NULL); 2382 constantTag tag = cp->tag_at(index); 2383 if (!tag.is_name_and_type()) { 2384 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2385 } 2386 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2387 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2388 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2389 objArrayHandle dest(THREAD, dest_o); 2390 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2391 dest->obj_at_put(0, str()); 2392 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2393 dest->obj_at_put(1, str()); 2394 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2395 } 2396 JVM_END 2397 2398 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2399 { 2400 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2401 bounds_check(cp, index, CHECK_0); 2402 constantTag tag = cp->tag_at(index); 2403 if (!tag.is_int()) { 2404 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2405 } 2406 return cp->int_at(index); 2407 } 2408 JVM_END 2409 2410 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2411 { 2412 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2413 bounds_check(cp, index, CHECK_(0L)); 2414 constantTag tag = cp->tag_at(index); 2415 if (!tag.is_long()) { 2416 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2417 } 2418 return cp->long_at(index); 2419 } 2420 JVM_END 2421 2422 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2423 { 2424 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2425 bounds_check(cp, index, CHECK_(0.0f)); 2426 constantTag tag = cp->tag_at(index); 2427 if (!tag.is_float()) { 2428 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2429 } 2430 return cp->float_at(index); 2431 } 2432 JVM_END 2433 2434 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2435 { 2436 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2437 bounds_check(cp, index, CHECK_(0.0)); 2438 constantTag tag = cp->tag_at(index); 2439 if (!tag.is_double()) { 2440 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2441 } 2442 return cp->double_at(index); 2443 } 2444 JVM_END 2445 2446 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2447 { 2448 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2449 bounds_check(cp, index, CHECK_NULL); 2450 constantTag tag = cp->tag_at(index); 2451 if (!tag.is_string()) { 2452 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2453 } 2454 oop str = cp->string_at(index, CHECK_NULL); 2455 return (jstring) JNIHandles::make_local(THREAD, str); 2456 } 2457 JVM_END 2458 2459 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2460 { 2461 JvmtiVMObjectAllocEventCollector oam; 2462 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2463 bounds_check(cp, index, CHECK_NULL); 2464 constantTag tag = cp->tag_at(index); 2465 if (!tag.is_symbol()) { 2466 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2467 } 2468 Symbol* sym = cp->symbol_at(index); 2469 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2470 return (jstring) JNIHandles::make_local(THREAD, str()); 2471 } 2472 JVM_END 2473 2474 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2475 { 2476 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2477 bounds_check(cp, index, CHECK_0); 2478 constantTag tag = cp->tag_at(index); 2479 jbyte result = tag.value(); 2480 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2481 // they are changed to the corresponding tags from the JVM spec, so that java code in 2482 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2483 if (tag.is_klass_or_reference()) { 2484 result = JVM_CONSTANT_Class; 2485 } else if (tag.is_string_index()) { 2486 result = JVM_CONSTANT_String; 2487 } else if (tag.is_method_type_in_error()) { 2488 result = JVM_CONSTANT_MethodType; 2489 } else if (tag.is_method_handle_in_error()) { 2490 result = JVM_CONSTANT_MethodHandle; 2491 } else if (tag.is_dynamic_constant_in_error()) { 2492 result = JVM_CONSTANT_Dynamic; 2493 } 2494 return result; 2495 } 2496 JVM_END 2497 2498 // Assertion support. ////////////////////////////////////////////////////////// 2499 2500 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2501 assert(cls != nullptr, "bad class"); 2502 2503 oop r = JNIHandles::resolve(cls); 2504 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2505 if (java_lang_Class::is_primitive(r)) return false; 2506 2507 Klass* k = java_lang_Class::as_Klass(r); 2508 assert(k->is_instance_klass(), "must be an instance klass"); 2509 if (!k->is_instance_klass()) return false; 2510 2511 ResourceMark rm(THREAD); 2512 const char* name = k->name()->as_C_string(); 2513 bool system_class = k->class_loader() == nullptr; 2514 return JavaAssertions::enabled(name, system_class); 2515 2516 JVM_END 2517 2518 2519 // Return a new AssertionStatusDirectives object with the fields filled in with 2520 // command-line assertion arguments (i.e., -ea, -da). 2521 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2522 JvmtiVMObjectAllocEventCollector oam; 2523 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2524 return JNIHandles::make_local(THREAD, asd); 2525 JVM_END 2526 2527 // Arrays support ///////////////////////////////////////////////////////////// 2528 2529 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2530 oop o = JNIHandles::resolve(array); 2531 Klass* k = o->klass(); 2532 if ((o == nullptr) || (!k->is_array_klass())) { 2533 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2534 } 2535 return ArrayKlass::cast(k)->element_access_must_be_atomic(); 2536 JVM_END 2537 2538 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2539 oop o = JNIHandles::resolve(array); 2540 Klass* k = o->klass(); 2541 if ((o == nullptr) || (!k->is_array_klass())) { 2542 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2543 } 2544 if (k->is_flatArray_klass()) { 2545 FlatArrayKlass* vk = FlatArrayKlass::cast(k); 2546 if (!vk->element_access_must_be_atomic()) { 2547 /** 2548 * Need to decide how to implement: 2549 * 2550 * 1) Change to objArrayOop layout, therefore oop->klass() differs so 2551 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through 2552 * "checkcast" & "instanceof" 2553 * 2554 * 2) Use extra header in the flatArrayOop to flag atomicity required and 2555 * possibly per instance lock structure. Said info, could be placed in 2556 * "trailer" rather than disturb the current arrayOop 2557 */ 2558 Unimplemented(); 2559 } 2560 } 2561 return array; 2562 JVM_END 2563 2564 // Verification //////////////////////////////////////////////////////////////////////////////// 2565 2566 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2567 2568 // RedefineClasses support: bug 6214132 caused verification to fail. 2569 // All functions from this section should call the jvmtiThreadSate function: 2570 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2571 // The function returns a Klass* of the _scratch_class if the verifier 2572 // was invoked in the middle of the class redefinition. 2573 // Otherwise it returns its argument value which is the _the_class Klass*. 2574 // Please, refer to the description in the jvmtiThreadSate.hpp. 2575 2576 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2577 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2578 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2579 return k->name()->as_utf8(); 2580 JVM_END 2581 2582 2583 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2584 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2585 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2586 // types will have length zero if this is not an InstanceKlass 2587 // (length is determined by call to JVM_GetClassCPEntriesCount) 2588 if (k->is_instance_klass()) { 2589 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2590 for (int index = cp->length() - 1; index >= 0; index--) { 2591 constantTag tag = cp->tag_at(index); 2592 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2593 } 2594 } 2595 JVM_END 2596 2597 2598 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2599 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2600 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2601 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2602 JVM_END 2603 2604 2605 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2606 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2607 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2608 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2609 JVM_END 2610 2611 2612 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2613 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2614 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2615 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2616 JVM_END 2617 2618 2619 // The following methods, used for the verifier, are never called with 2620 // array klasses, so a direct cast to InstanceKlass is safe. 2621 // Typically, these methods are called in a loop with bounds determined 2622 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2623 // zero for arrays. 2624 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2625 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2626 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2627 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2628 int length = method->checked_exceptions_length(); 2629 if (length > 0) { 2630 CheckedExceptionElement* table= method->checked_exceptions_start(); 2631 for (int i = 0; i < length; i++) { 2632 exceptions[i] = table[i].class_cp_index; 2633 } 2634 } 2635 JVM_END 2636 2637 2638 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2639 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2640 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2641 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2642 return method->checked_exceptions_length(); 2643 JVM_END 2644 2645 2646 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2647 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2648 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2649 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2650 memcpy(code, method->code_base(), method->code_size()); 2651 JVM_END 2652 2653 2654 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2655 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2656 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2657 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2658 return method->code_size(); 2659 JVM_END 2660 2661 2662 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2663 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2664 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2665 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2666 ExceptionTable extable(method); 2667 entry->start_pc = extable.start_pc(entry_index); 2668 entry->end_pc = extable.end_pc(entry_index); 2669 entry->handler_pc = extable.handler_pc(entry_index); 2670 entry->catchType = extable.catch_type_index(entry_index); 2671 JVM_END 2672 2673 2674 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2675 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2676 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2677 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2678 return method->exception_table_length(); 2679 JVM_END 2680 2681 2682 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2683 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2684 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2685 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2686 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2687 JVM_END 2688 2689 2690 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2691 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2692 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2693 return InstanceKlass::cast(k)->field_access_flags(field_index); 2694 JVM_END 2695 2696 2697 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2698 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2699 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2700 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2701 return method->max_locals(); 2702 JVM_END 2703 2704 2705 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 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->size_of_parameters(); 2710 JVM_END 2711 2712 2713 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2714 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2715 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2716 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2717 return method->verifier_max_stack(); 2718 JVM_END 2719 2720 2721 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2722 ResourceMark rm(THREAD); 2723 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2724 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2725 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2726 return method->is_object_constructor(); 2727 JVM_END 2728 2729 2730 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2731 ResourceMark rm(THREAD); 2732 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2733 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2734 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2735 return method->is_overpass(); 2736 JVM_END 2737 2738 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2739 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2740 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2741 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2742 return method->name()->as_utf8(); 2743 JVM_END 2744 2745 2746 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2747 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2748 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2749 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2750 return method->signature()->as_utf8(); 2751 JVM_END 2752 2753 /** 2754 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2755 * read entries in the constant pool. Since the old verifier always 2756 * works on a copy of the code, it will not see any rewriting that 2757 * may possibly occur in the middle of verification. So it is important 2758 * that nothing it calls tries to use the cpCache instead of the raw 2759 * constant pool, so we must use cp->uncached_x methods when appropriate. 2760 */ 2761 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2762 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2763 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2764 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2765 switch (cp->tag_at(cp_index).value()) { 2766 case JVM_CONSTANT_Fieldref: 2767 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2768 default: 2769 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2770 } 2771 ShouldNotReachHere(); 2772 return nullptr; 2773 JVM_END 2774 2775 2776 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2777 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2778 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2779 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2780 switch (cp->tag_at(cp_index).value()) { 2781 case JVM_CONSTANT_InterfaceMethodref: 2782 case JVM_CONSTANT_Methodref: 2783 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2784 default: 2785 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2786 } 2787 ShouldNotReachHere(); 2788 return nullptr; 2789 JVM_END 2790 2791 2792 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2793 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2794 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2795 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2796 switch (cp->tag_at(cp_index).value()) { 2797 case JVM_CONSTANT_InterfaceMethodref: 2798 case JVM_CONSTANT_Methodref: 2799 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2800 default: 2801 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2802 } 2803 ShouldNotReachHere(); 2804 return nullptr; 2805 JVM_END 2806 2807 2808 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2809 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2810 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2811 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2812 switch (cp->tag_at(cp_index).value()) { 2813 case JVM_CONSTANT_Fieldref: 2814 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2815 default: 2816 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2817 } 2818 ShouldNotReachHere(); 2819 return nullptr; 2820 JVM_END 2821 2822 2823 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2824 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2825 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2826 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2827 Symbol* classname = cp->klass_name_at(cp_index); 2828 return classname->as_utf8(); 2829 JVM_END 2830 2831 2832 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2833 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2834 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2835 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2836 switch (cp->tag_at(cp_index).value()) { 2837 case JVM_CONSTANT_Fieldref: { 2838 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2839 Symbol* classname = cp->klass_name_at(class_index); 2840 return classname->as_utf8(); 2841 } 2842 default: 2843 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2844 } 2845 ShouldNotReachHere(); 2846 return nullptr; 2847 JVM_END 2848 2849 2850 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2851 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2852 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2853 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2854 switch (cp->tag_at(cp_index).value()) { 2855 case JVM_CONSTANT_Methodref: 2856 case JVM_CONSTANT_InterfaceMethodref: { 2857 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2858 Symbol* classname = cp->klass_name_at(class_index); 2859 return classname->as_utf8(); 2860 } 2861 default: 2862 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2863 } 2864 ShouldNotReachHere(); 2865 return nullptr; 2866 JVM_END 2867 2868 2869 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2870 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2871 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2872 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2873 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2874 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2875 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2876 switch (cp->tag_at(cp_index).value()) { 2877 case JVM_CONSTANT_Fieldref: { 2878 Symbol* name = cp->uncached_name_ref_at(cp_index); 2879 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2880 InstanceKlass* ik = InstanceKlass::cast(k_called); 2881 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2882 if (fs.name() == name && fs.signature() == signature) { 2883 return fs.access_flags().as_short(); 2884 } 2885 } 2886 return -1; 2887 } 2888 default: 2889 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2890 } 2891 ShouldNotReachHere(); 2892 return 0; 2893 JVM_END 2894 2895 2896 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2897 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2898 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2899 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2900 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2901 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2902 switch (cp->tag_at(cp_index).value()) { 2903 case JVM_CONSTANT_Methodref: 2904 case JVM_CONSTANT_InterfaceMethodref: { 2905 Symbol* name = cp->uncached_name_ref_at(cp_index); 2906 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2907 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2908 int methods_count = methods->length(); 2909 for (int i = 0; i < methods_count; i++) { 2910 Method* method = methods->at(i); 2911 if (method->name() == name && method->signature() == signature) { 2912 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2913 } 2914 } 2915 return -1; 2916 } 2917 default: 2918 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2919 } 2920 ShouldNotReachHere(); 2921 return 0; 2922 JVM_END 2923 2924 2925 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2926 2927 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2928 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2929 JVM_END 2930 2931 2932 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2933 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2934 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2935 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2936 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2937 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2938 JVM_END 2939 2940 // Printing support ////////////////////////////////////////////////// 2941 extern "C" { 2942 2943 ATTRIBUTE_PRINTF(3, 0) 2944 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2945 // Reject count values that are negative signed values converted to 2946 // unsigned; see bug 4399518, 4417214 2947 if ((intptr_t)count <= 0) return -1; 2948 2949 int result = os::vsnprintf(str, count, fmt, args); 2950 if (result > 0 && (size_t)result >= count) { 2951 result = -1; 2952 } 2953 2954 return result; 2955 } 2956 2957 ATTRIBUTE_PRINTF(3, 4) 2958 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2959 va_list args; 2960 int len; 2961 va_start(args, fmt); 2962 len = jio_vsnprintf(str, count, fmt, args); 2963 va_end(args); 2964 return len; 2965 } 2966 2967 ATTRIBUTE_PRINTF(2, 3) 2968 int jio_fprintf(FILE* f, const char *fmt, ...) { 2969 int len; 2970 va_list args; 2971 va_start(args, fmt); 2972 len = jio_vfprintf(f, fmt, args); 2973 va_end(args); 2974 return len; 2975 } 2976 2977 ATTRIBUTE_PRINTF(2, 0) 2978 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2979 if (Arguments::vfprintf_hook() != nullptr) { 2980 return Arguments::vfprintf_hook()(f, fmt, args); 2981 } else { 2982 return vfprintf(f, fmt, args); 2983 } 2984 } 2985 2986 ATTRIBUTE_PRINTF(1, 2) 2987 JNIEXPORT int jio_printf(const char *fmt, ...) { 2988 int len; 2989 va_list args; 2990 va_start(args, fmt); 2991 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2992 va_end(args); 2993 return len; 2994 } 2995 2996 // HotSpot specific jio method 2997 void jio_print(const char* s, size_t len) { 2998 // Try to make this function as atomic as possible. 2999 if (Arguments::vfprintf_hook() != nullptr) { 3000 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 3001 } else { 3002 // Make an unused local variable to avoid warning from gcc compiler. 3003 bool dummy = os::write(defaultStream::output_fd(), s, len); 3004 } 3005 } 3006 3007 } // Extern C 3008 3009 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 3010 3011 // In most of the JVM thread support functions we need to access the 3012 // thread through a ThreadsListHandle to prevent it from exiting and 3013 // being reclaimed while we try to operate on it. The exceptions to this 3014 // rule are when operating on the current thread, or if the monitor of 3015 // the target java.lang.Thread is locked at the Java level - in both 3016 // cases the target cannot exit. 3017 3018 static void thread_entry(JavaThread* thread, TRAPS) { 3019 HandleMark hm(THREAD); 3020 Handle obj(THREAD, thread->threadObj()); 3021 JavaValue result(T_VOID); 3022 JavaCalls::call_virtual(&result, 3023 obj, 3024 vmClasses::Thread_klass(), 3025 vmSymbols::run_method_name(), 3026 vmSymbols::void_method_signature(), 3027 THREAD); 3028 } 3029 3030 3031 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 3032 #if INCLUDE_CDS 3033 if (CDSConfig::is_dumping_static_archive()) { 3034 // During java -Xshare:dump, if we allow multiple Java threads to 3035 // execute in parallel, symbols and classes may be loaded in 3036 // random orders which will make the resulting CDS archive 3037 // non-deterministic. 3038 // 3039 // Lucikly, during java -Xshare:dump, it's important to run only 3040 // the code in the main Java thread (which is NOT started here) that 3041 // creates the module graph, etc. It's safe to not start the other 3042 // threads which are launched by class static initializers 3043 // (ReferenceHandler, FinalizerThread and CleanerImpl). 3044 if (log_is_enabled(Info, cds)) { 3045 ResourceMark rm; 3046 oop t = JNIHandles::resolve_non_null(jthread); 3047 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 3048 } 3049 return; 3050 } 3051 #endif 3052 JavaThread *native_thread = nullptr; 3053 3054 // We cannot hold the Threads_lock when we throw an exception, 3055 // due to rank ordering issues. Example: we might need to grab the 3056 // Heap_lock while we construct the exception. 3057 bool throw_illegal_thread_state = false; 3058 3059 // We must release the Threads_lock before we can post a jvmti event 3060 // in Thread::start. 3061 { 3062 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock); 3063 // Ensure that the C++ Thread and OSThread structures aren't freed before 3064 // we operate. 3065 MutexLocker ml(Threads_lock); 3066 3067 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 3068 // re-starting an already started thread, so we should usually find 3069 // that the JavaThread is null. However for a JNI attached thread 3070 // there is a small window between the Thread object being created 3071 // (with its JavaThread set) and the update to its threadStatus, so we 3072 // have to check for this 3073 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 3074 throw_illegal_thread_state = true; 3075 } else { 3076 jlong size = 3077 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 3078 // Allocate the C++ Thread structure and create the native thread. The 3079 // stack size retrieved from java is 64-bit signed, but the constructor takes 3080 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 3081 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 3082 // - Avoid passing negative values which would result in really large stacks. 3083 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 3084 size_t sz = size > 0 ? (size_t) size : 0; 3085 native_thread = new JavaThread(&thread_entry, sz); 3086 3087 // At this point it may be possible that no osthread was created for the 3088 // JavaThread due to lack of memory. Check for this situation and throw 3089 // an exception if necessary. Eventually we may want to change this so 3090 // that we only grab the lock if the thread was created successfully - 3091 // then we can also do this check and throw the exception in the 3092 // JavaThread constructor. 3093 if (native_thread->osthread() != nullptr) { 3094 // Note: the current thread is not being used within "prepare". 3095 native_thread->prepare(jthread); 3096 } 3097 } 3098 } 3099 3100 if (throw_illegal_thread_state) { 3101 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3102 } 3103 3104 assert(native_thread != nullptr, "Starting null thread?"); 3105 3106 if (native_thread->osthread() == nullptr) { 3107 ResourceMark rm(thread); 3108 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 3109 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 3110 // No one should hold a reference to the 'native_thread'. 3111 native_thread->smr_delete(); 3112 if (JvmtiExport::should_post_resource_exhausted()) { 3113 JvmtiExport::post_resource_exhausted( 3114 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3115 os::native_thread_creation_failed_msg()); 3116 } 3117 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3118 os::native_thread_creation_failed_msg()); 3119 } 3120 3121 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3122 3123 Thread::start(native_thread); 3124 3125 JVM_END 3126 3127 3128 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3129 ThreadsListHandle tlh(thread); 3130 oop java_thread = nullptr; 3131 JavaThread* receiver = nullptr; 3132 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3133 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3134 3135 if (is_alive) { 3136 // jthread refers to a live JavaThread. 3137 Thread::set_priority(receiver, (ThreadPriority)prio); 3138 } 3139 // Implied else: If the JavaThread hasn't started yet, then the 3140 // priority set in the java.lang.Thread object above will be pushed 3141 // down when it does start. 3142 JVM_END 3143 3144 3145 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3146 if (os::dont_yield()) return; 3147 HOTSPOT_THREAD_YIELD(); 3148 os::naked_yield(); 3149 JVM_END 3150 3151 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos)) 3152 if (nanos < 0) { 3153 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range"); 3154 } 3155 3156 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3157 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3158 } 3159 3160 // Save current thread state and restore it at the end of this block. 3161 // And set new thread state to SLEEPING. 3162 JavaThreadSleepState jtss(thread); 3163 3164 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC); 3165 3166 if (nanos == 0) { 3167 os::naked_yield(); 3168 } else { 3169 ThreadState old_state = thread->osthread()->get_state(); 3170 thread->osthread()->set_state(SLEEPING); 3171 if (!thread->sleep_nanos(nanos)) { // interrupted 3172 // An asynchronous exception could have been thrown on 3173 // us while we were sleeping. We do not overwrite those. 3174 if (!HAS_PENDING_EXCEPTION) { 3175 HOTSPOT_THREAD_SLEEP_END(1); 3176 3177 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3178 // to properly restore the thread state. That's likely wrong. 3179 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3180 } 3181 } 3182 thread->osthread()->set_state(old_state); 3183 } 3184 HOTSPOT_THREAD_SLEEP_END(0); 3185 JVM_END 3186 3187 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3188 oop jthread = thread->threadObj(); 3189 assert(jthread != nullptr, "no current carrier thread!"); 3190 return JNIHandles::make_local(THREAD, jthread); 3191 JVM_END 3192 3193 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3194 oop theThread = thread->vthread(); 3195 assert(theThread != (oop)nullptr, "no current thread!"); 3196 return JNIHandles::make_local(THREAD, theThread); 3197 JVM_END 3198 3199 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3200 jobject theThread)) 3201 oop threadObj = JNIHandles::resolve(theThread); 3202 thread->set_vthread(threadObj); 3203 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3204 JVM_END 3205 3206 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3207 return ThreadIdentifier::unsafe_offset(); 3208 JVM_END 3209 3210 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3211 ThreadsListHandle tlh(thread); 3212 JavaThread* receiver = nullptr; 3213 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3214 if (is_alive) { 3215 // jthread refers to a live JavaThread. 3216 receiver->interrupt(); 3217 } 3218 JVM_END 3219 3220 // Return true iff the current thread has locked the object passed in 3221 3222 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3223 if (obj == nullptr) { 3224 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3225 } 3226 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3227 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3228 JVM_END 3229 3230 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3231 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD); 3232 return JNIHandles::make_local(THREAD, trace); 3233 JVM_END 3234 3235 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3236 // We don't use a ThreadsListHandle here because the current thread 3237 // must be alive. 3238 oop java_thread = JNIHandles::resolve_non_null(jthread); 3239 JavaThread* thr = java_lang_Thread::thread(java_thread); 3240 if (thread == thr && !thr->has_attached_via_jni()) { 3241 // Thread naming is only supported for the current thread and 3242 // we don't set the name of an attached thread to avoid stepping 3243 // on other programs. 3244 ResourceMark rm(thread); 3245 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3246 os::set_native_thread_name(thread_name); 3247 } 3248 JVM_END 3249 3250 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3251 oop theCache = thread->scopedValueCache(); 3252 return JNIHandles::make_local(THREAD, theCache); 3253 JVM_END 3254 3255 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3256 jobject theCache)) 3257 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3258 thread->set_scopedValueCache(objs); 3259 JVM_END 3260 3261 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3262 3263 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3264 ResourceMark rm(THREAD); 3265 JvmtiVMObjectAllocEventCollector oam; 3266 vframeStream vfst(thread); 3267 3268 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) { 3269 // This must only be called from SecurityManager.getClassContext 3270 Method* m = vfst.method(); 3271 if (!(m->method_holder() == vmClasses::SecurityManager_klass() && 3272 m->name() == vmSymbols::getClassContext_name() && 3273 m->signature() == vmSymbols::void_class_array_signature())) { 3274 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3275 } 3276 } 3277 3278 // Collect method holders 3279 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3280 for (; !vfst.at_end(); vfst.security_next()) { 3281 Method* m = vfst.method(); 3282 // Native frames are not returned 3283 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3284 Klass* holder = m->method_holder(); 3285 assert(holder->is_klass(), "just checking"); 3286 klass_array->append(holder); 3287 } 3288 } 3289 3290 // Create result array of type [Ljava/lang/Class; 3291 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL); 3292 // Fill in mirrors corresponding to method holders 3293 for (int i = 0; i < klass_array->length(); i++) { 3294 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3295 } 3296 3297 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3298 JVM_END 3299 3300 3301 // java.lang.Package //////////////////////////////////////////////////////////////// 3302 3303 3304 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3305 ResourceMark rm(THREAD); 3306 JvmtiVMObjectAllocEventCollector oam; 3307 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3308 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3309 return (jstring) JNIHandles::make_local(THREAD, result); 3310 JVM_END 3311 3312 3313 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3314 JvmtiVMObjectAllocEventCollector oam; 3315 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3316 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3317 JVM_END 3318 3319 3320 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3321 3322 3323 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3324 MonitorLocker ml(Heap_lock); 3325 oop ref = Universe::reference_pending_list(); 3326 if (ref != nullptr) { 3327 Universe::clear_reference_pending_list(); 3328 } 3329 return JNIHandles::make_local(THREAD, ref); 3330 JVM_END 3331 3332 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3333 MonitorLocker ml(Heap_lock); 3334 return Universe::has_reference_pending_list(); 3335 JVM_END 3336 3337 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3338 MonitorLocker ml(Heap_lock); 3339 while (!Universe::has_reference_pending_list()) { 3340 ml.wait(); 3341 } 3342 JVM_END 3343 3344 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3345 oop ref_oop = JNIHandles::resolve_non_null(ref); 3346 // PhantomReference has it's own implementation of refersTo(). 3347 // See: JVM_PhantomReferenceRefersTo 3348 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3349 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3350 return referent == JNIHandles::resolve(o); 3351 JVM_END 3352 3353 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3354 oop ref_oop = JNIHandles::resolve_non_null(ref); 3355 // FinalReference has it's own implementation of clear(). 3356 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3357 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3358 // If the referent has already been cleared then done. 3359 // However, if the referent is dead but has not yet been cleared by 3360 // concurrent reference processing, it should NOT be cleared here. 3361 // Instead, clearing should be left to the GC. Clearing it here could 3362 // detectably lose an expected notification, which is impossible with 3363 // STW reference processing. The clearing in enqueue() doesn't have 3364 // this problem, since the enqueue covers the notification, but it's not 3365 // worth the effort to handle that case specially. 3366 return; 3367 } 3368 java_lang_ref_Reference::clear_referent(ref_oop); 3369 JVM_END 3370 3371 3372 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3373 3374 3375 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3376 oop ref_oop = JNIHandles::resolve_non_null(ref); 3377 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3378 return referent == JNIHandles::resolve(o); 3379 JVM_END 3380 3381 3382 // ObjectInputStream /////////////////////////////////////////////////////////////// 3383 3384 // Return the first user-defined class loader up the execution stack, or null 3385 // if only code from the bootstrap or platform class loader is on the stack. 3386 3387 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3388 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3389 InstanceKlass* ik = vfst.method()->method_holder(); 3390 oop loader = ik->class_loader(); 3391 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3392 // Skip reflection related frames 3393 if (!ik->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) { 3394 return JNIHandles::make_local(THREAD, loader); 3395 } 3396 } 3397 } 3398 return nullptr; 3399 JVM_END 3400 3401 3402 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3403 3404 3405 // resolve array handle and check arguments 3406 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3407 if (arr == nullptr) { 3408 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3409 } 3410 oop a = JNIHandles::resolve_non_null(arr); 3411 if (!a->is_array()) { 3412 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3413 } else if (type_array_only && !a->is_typeArray()) { 3414 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3415 } 3416 return arrayOop(a); 3417 } 3418 3419 3420 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3421 arrayOop a = check_array(env, arr, false, CHECK_0); 3422 return a->length(); 3423 JVM_END 3424 3425 3426 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3427 JvmtiVMObjectAllocEventCollector oam; 3428 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3429 jvalue value; 3430 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3431 oop box = Reflection::box(&value, type, CHECK_NULL); 3432 return JNIHandles::make_local(THREAD, box); 3433 JVM_END 3434 3435 3436 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3437 jvalue value; 3438 value.i = 0; // to initialize value before getting used in CHECK 3439 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3440 assert(a->is_typeArray(), "just checking"); 3441 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3442 BasicType wide_type = (BasicType) wCode; 3443 if (type != wide_type) { 3444 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3445 } 3446 return value; 3447 JVM_END 3448 3449 3450 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3451 arrayOop a = check_array(env, arr, false, CHECK); 3452 oop box = JNIHandles::resolve(val); 3453 jvalue value; 3454 value.i = 0; // to initialize value before getting used in CHECK 3455 BasicType value_type; 3456 if (a->is_objArray()) { 3457 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3458 value_type = Reflection::unbox_for_regular_object(box, &value); 3459 } else { 3460 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3461 } 3462 Reflection::array_set(&value, a, index, value_type, CHECK); 3463 JVM_END 3464 3465 3466 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3467 arrayOop a = check_array(env, arr, true, CHECK); 3468 assert(a->is_typeArray(), "just checking"); 3469 BasicType value_type = (BasicType) vCode; 3470 Reflection::array_set(&v, a, index, value_type, CHECK); 3471 JVM_END 3472 3473 3474 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3475 JvmtiVMObjectAllocEventCollector oam; 3476 oop element_mirror = JNIHandles::resolve(eltClass); 3477 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3478 return JNIHandles::make_local(THREAD, result); 3479 JVM_END 3480 3481 3482 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3483 JvmtiVMObjectAllocEventCollector oam; 3484 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3485 oop element_mirror = JNIHandles::resolve(eltClass); 3486 assert(dim_array->is_typeArray(), "just checking"); 3487 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3488 return JNIHandles::make_local(THREAD, result); 3489 JVM_END 3490 3491 3492 // Library support /////////////////////////////////////////////////////////////////////////// 3493 3494 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3495 return ZipLibrary::handle(); 3496 JVM_END 3497 3498 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3499 //%note jvm_ct 3500 char ebuf[1024]; 3501 void *load_result; 3502 { 3503 ThreadToNativeFromVM ttnfvm(thread); 3504 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3505 } 3506 if (load_result == nullptr) { 3507 if (throwException) { 3508 char msg[1024]; 3509 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3510 // Since 'ebuf' may contain a string encoded using 3511 // platform encoding scheme, we need to pass 3512 // Exceptions::unsafe_to_utf8 to the new_exception method 3513 // as the last argument. See bug 6367357. 3514 Handle h_exception = 3515 Exceptions::new_exception(thread, 3516 vmSymbols::java_lang_UnsatisfiedLinkError(), 3517 msg, Exceptions::unsafe_to_utf8); 3518 3519 THROW_HANDLE_NULL(h_exception); 3520 } else { 3521 log_info(library)("Failed to load library %s", name); 3522 return load_result; 3523 } 3524 } 3525 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3526 return load_result; 3527 JVM_END 3528 3529 3530 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3531 os::dll_unload(handle); 3532 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3533 JVM_END 3534 3535 3536 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3537 void* find_result = os::dll_lookup(handle, name); 3538 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3539 find_result != nullptr ? "Found" : "Failed to find", 3540 name, p2i(handle)); 3541 return find_result; 3542 JVM_END 3543 3544 3545 // JNI version /////////////////////////////////////////////////////////////////////////////// 3546 3547 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3548 return Threads::is_supported_jni_version_including_1_1(version); 3549 JVM_END 3550 3551 3552 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3553 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3554 JVM_END 3555 3556 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void)) 3557 return EnableValhalla ? JNI_TRUE : JNI_FALSE; 3558 JVM_END 3559 3560 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3561 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3562 JVM_END 3563 3564 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void)) 3565 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE; 3566 JVM_END 3567 3568 JVM_ENTRY_NO_ENV(jboolean, JVM_IsStaticallyLinked(void)) 3569 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE; 3570 JVM_END 3571 3572 // String support /////////////////////////////////////////////////////////////////////////// 3573 3574 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3575 JvmtiVMObjectAllocEventCollector oam; 3576 if (str == nullptr) return nullptr; 3577 oop string = JNIHandles::resolve_non_null(str); 3578 oop result = StringTable::intern(string, CHECK_NULL); 3579 return (jstring) JNIHandles::make_local(THREAD, result); 3580 JVM_END 3581 3582 3583 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3584 3585 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3586 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3587 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3588 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3589 // nature. JavaThreads will be "in native" when using this API from JDK code. 3590 3591 3592 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3593 VM_Exit::block_if_vm_exited(); 3594 return new PlatformMutex(); 3595 } 3596 3597 3598 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3599 VM_Exit::block_if_vm_exited(); 3600 delete ((PlatformMutex*) mon); 3601 } 3602 3603 3604 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3605 VM_Exit::block_if_vm_exited(); 3606 ((PlatformMutex*) mon)->lock(); 3607 return 0; 3608 } 3609 3610 3611 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3612 VM_Exit::block_if_vm_exited(); 3613 ((PlatformMutex*) mon)->unlock(); 3614 } 3615 3616 3617 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3618 3619 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3620 Handle loader, Handle protection_domain, 3621 jboolean throwError, TRAPS) { 3622 // Security Note: 3623 // The Java level wrapper will perform the necessary security check allowing 3624 // us to pass the null as the initiating class loader. The VM is responsible for 3625 // the checkPackageAccess relative to the initiating class loader via the 3626 // protection_domain. The protection_domain is passed as null by the java code 3627 // if there is no security manager in 3-arg Class.forName(). 3628 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3629 3630 // Check if we should initialize the class 3631 if (init && klass->is_instance_klass()) { 3632 klass->initialize(CHECK_NULL); 3633 } 3634 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3635 } 3636 3637 3638 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3639 3640 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3641 Handle method_handle; 3642 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3643 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3644 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3645 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL); 3646 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3647 jobject res = JNIHandles::make_local(THREAD, result); 3648 if (JvmtiExport::should_post_vm_object_alloc()) { 3649 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3650 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3651 if (java_lang_Class::is_primitive(ret_type)) { 3652 // Only for primitive type vm allocates memory for java object. 3653 // See box() method. 3654 JvmtiExport::post_vm_object_alloc(thread, result); 3655 } 3656 } 3657 return res; 3658 } else { 3659 THROW_NULL(vmSymbols::java_lang_StackOverflowError()); 3660 } 3661 JVM_END 3662 3663 3664 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3665 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL); 3666 oop constructor_mirror = JNIHandles::resolve(c); 3667 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3668 jobject res = JNIHandles::make_local(THREAD, result); 3669 if (JvmtiExport::should_post_vm_object_alloc()) { 3670 JvmtiExport::post_vm_object_alloc(thread, result); 3671 } 3672 return res; 3673 JVM_END 3674 3675 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3676 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3677 assert(k->is_klass(), "just checking"); 3678 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3679 JVM_END 3680 3681 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3682 jclass caller, 3683 jstring interfaceMethodName, 3684 jobject factoryType, 3685 jobject interfaceMethodType, 3686 jobject implementationMember, 3687 jobject dynamicMethodType, 3688 jclass lambdaProxyClass)) 3689 #if INCLUDE_CDS 3690 if (!CDSConfig::is_dumping_archive()) { 3691 return; 3692 } 3693 3694 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3695 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3696 if (caller_ik->is_hidden()) { 3697 // Hidden classes not of type lambda proxy classes are currently not being archived. 3698 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3699 // registered for archiving. 3700 return; 3701 } 3702 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass)); 3703 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k); 3704 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3705 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3706 3707 Symbol* interface_method_name = nullptr; 3708 if (interfaceMethodName != nullptr) { 3709 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3710 } 3711 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3712 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3713 3714 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3715 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3716 3717 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3718 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3719 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3720 3721 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3722 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3723 3724 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3725 interface_method_type, m, dynamic_method_type, THREAD); 3726 #endif // INCLUDE_CDS 3727 JVM_END 3728 3729 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3730 jclass caller, 3731 jstring interfaceMethodName, 3732 jobject factoryType, 3733 jobject interfaceMethodType, 3734 jobject implementationMember, 3735 jobject dynamicMethodType)) 3736 #if INCLUDE_CDS 3737 3738 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3739 implementationMember == nullptr || dynamicMethodType == nullptr) { 3740 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3741 } 3742 3743 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3744 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3745 if (!caller_ik->is_shared()) { 3746 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3747 return nullptr; 3748 } 3749 3750 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3751 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3752 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3753 3754 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3755 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3756 3757 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3758 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3759 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3760 3761 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3762 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3763 3764 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3765 interface_method_type, m, dynamic_method_type); 3766 jclass jcls = nullptr; 3767 if (lambda_ik != nullptr) { 3768 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD); 3769 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3770 } 3771 return jcls; 3772 #else 3773 return nullptr; 3774 #endif // INCLUDE_CDS 3775 JVM_END 3776 3777 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3778 if (CDSConfig::is_dumping_static_archive()) { 3779 // We do this so that the default CDS archive can be deterministic. 3780 const char* release = VM_Version::vm_release(); 3781 const char* dbg_level = VM_Version::jdk_debug_level(); 3782 const char* version = VM_Version::internal_vm_info_string(); 3783 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3784 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3785 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3786 seed += (jlong)VM_Version::vm_major_version(); 3787 seed += (jlong)VM_Version::vm_minor_version(); 3788 seed += (jlong)VM_Version::vm_security_version(); 3789 seed += (jlong)VM_Version::vm_patch_version(); 3790 if (seed == 0) { // don't let this ever be zero. 3791 seed = 0x87654321; 3792 } 3793 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3794 return seed; 3795 } else { 3796 return 0; 3797 } 3798 JVM_END 3799 3800 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus()) 3801 return CDSConfig::get_status(); 3802 JVM_END 3803 3804 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3805 #if INCLUDE_CDS 3806 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity"); 3807 if (line != nullptr) { 3808 ResourceMark rm(THREAD); 3809 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3810 char* c_line = java_lang_String::as_utf8_string(h_line()); 3811 if (CDSConfig::is_dumping_dynamic_archive()) { 3812 // Note: LambdaFormInvokers::append take same format which is not 3813 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3814 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3815 } 3816 if (ClassListWriter::is_enabled()) { 3817 ClassListWriter w; 3818 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line); 3819 } 3820 } 3821 #endif // INCLUDE_CDS 3822 JVM_END 3823 3824 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3825 #if INCLUDE_CDS 3826 ResourceMark rm(THREAD); 3827 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3828 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3829 MetaspaceShared::dump_loaded_classes(file_name, THREAD); 3830 #endif // INCLUDE_CDS 3831 JVM_END 3832 3833 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3834 #if INCLUDE_CDS 3835 ResourceMark rm(THREAD); 3836 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3837 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3838 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3839 #endif // INCLUDE_CDS 3840 JVM_END 3841 3842 // Returns an array of all live Thread objects (VM internal JavaThreads, 3843 // jvmti agent threads, and JNI attaching threads are skipped) 3844 // See CR 6404306 regarding JNI attaching threads 3845 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3846 ResourceMark rm(THREAD); 3847 ThreadsListEnumerator tle(THREAD, false, false); 3848 JvmtiVMObjectAllocEventCollector oam; 3849 3850 int num_threads = tle.num_threads(); 3851 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3852 objArrayHandle threads_ah(THREAD, r); 3853 3854 for (int i = 0; i < num_threads; i++) { 3855 Handle h = tle.get_threadObj(i); 3856 threads_ah->obj_at_put(i, h()); 3857 } 3858 3859 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3860 JVM_END 3861 3862 3863 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3864 // Return StackTraceElement[][], each element is the stack trace of a thread in 3865 // the corresponding entry in the given threads array 3866 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3867 JvmtiVMObjectAllocEventCollector oam; 3868 3869 // Check if threads is null 3870 if (threads == nullptr) { 3871 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3872 } 3873 3874 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3875 objArrayHandle ah(THREAD, a); 3876 int num_threads = ah->length(); 3877 // check if threads is non-empty array 3878 if (num_threads == 0) { 3879 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3880 } 3881 3882 // check if threads is not an array of objects of Thread class 3883 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3884 if (k != vmClasses::Thread_klass()) { 3885 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3886 } 3887 3888 ResourceMark rm(THREAD); 3889 3890 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3891 for (int i = 0; i < num_threads; i++) { 3892 oop thread_obj = ah->obj_at(i); 3893 instanceHandle h(THREAD, (instanceOop) thread_obj); 3894 thread_handle_array->append(h); 3895 } 3896 3897 // The JavaThread references in thread_handle_array are validated 3898 // in VM_ThreadDump::doit(). 3899 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3900 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3901 3902 JVM_END 3903 3904 // JVM monitoring and management support 3905 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3906 return Management::get_jmm_interface(version); 3907 JVM_END 3908 3909 // com.sun.tools.attach.VirtualMachine agent properties support 3910 // 3911 // Initialize the agent properties with the properties maintained in the VM 3912 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3913 ResourceMark rm; 3914 3915 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3916 3917 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3918 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3919 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3920 return properties; 3921 JVM_END 3922 3923 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3924 { 3925 JvmtiVMObjectAllocEventCollector oam; 3926 3927 if (ofClass == nullptr) { 3928 return nullptr; 3929 } 3930 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3931 // Special handling for primitive objects 3932 if (java_lang_Class::is_primitive(mirror())) { 3933 return nullptr; 3934 } 3935 Klass* k = java_lang_Class::as_Klass(mirror()); 3936 if (!k->is_instance_klass()) { 3937 return nullptr; 3938 } 3939 InstanceKlass* ik = InstanceKlass::cast(k); 3940 int encl_method_class_idx = ik->enclosing_method_class_index(); 3941 if (encl_method_class_idx == 0) { 3942 return nullptr; 3943 } 3944 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3945 objArrayHandle dest(THREAD, dest_o); 3946 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3947 dest->obj_at_put(0, enc_k->java_mirror()); 3948 int encl_method_method_idx = ik->enclosing_method_method_index(); 3949 if (encl_method_method_idx != 0) { 3950 Symbol* sym = ik->constants()->symbol_at( 3951 extract_low_short_from_int( 3952 ik->constants()->name_and_type_at(encl_method_method_idx))); 3953 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3954 dest->obj_at_put(1, str()); 3955 sym = ik->constants()->symbol_at( 3956 extract_high_short_from_int( 3957 ik->constants()->name_and_type_at(encl_method_method_idx))); 3958 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3959 dest->obj_at_put(2, str()); 3960 } 3961 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3962 } 3963 JVM_END 3964 3965 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3966 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3967 ResourceMark rm(THREAD); 3968 3969 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3970 return nullptr; 3971 } 3972 3973 char** vm_flags = Arguments::jvm_flags_array(); 3974 char** vm_args = Arguments::jvm_args_array(); 3975 int num_flags = Arguments::num_jvm_flags(); 3976 int num_args = Arguments::num_jvm_args(); 3977 3978 InstanceKlass* ik = vmClasses::String_klass(); 3979 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3980 objArrayHandle result_h(THREAD, r); 3981 3982 int index = 0; 3983 for (int j = 0; j < num_flags; j++, index++) { 3984 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3985 result_h->obj_at_put(index, h()); 3986 } 3987 for (int i = 0; i < num_args; i++, index++) { 3988 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3989 result_h->obj_at_put(index, h()); 3990 } 3991 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 3992 JVM_END 3993 3994 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 3995 return os::get_signal_number(name); 3996 JVM_END 3997 3998 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread)) 3999 #if INCLUDE_JVMTI 4000 if (!DoJVMTIVirtualThreadTransitions) { 4001 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4002 return; 4003 } 4004 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4005 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread); 4006 } else { 4007 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4008 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false); 4009 } 4010 #endif 4011 JVM_END 4012 4013 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread)) 4014 #if INCLUDE_JVMTI 4015 if (!DoJVMTIVirtualThreadTransitions) { 4016 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4017 return; 4018 } 4019 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4020 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread); 4021 } else { 4022 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4023 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true); 4024 } 4025 #endif 4026 JVM_END 4027 4028 // If notifications are disabled then just update the VTMS transition bit and return. 4029 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call. 4030 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide)) 4031 #if INCLUDE_JVMTI 4032 if (!DoJVMTIVirtualThreadTransitions) { 4033 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4034 return; 4035 } 4036 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4037 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide); 4038 } else { 4039 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4040 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 4041 } 4042 #endif 4043 JVM_END 4044 4045 // If notifications are disabled then just update the VTMS transition bit and return. 4046 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below. 4047 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide)) 4048 #if INCLUDE_JVMTI 4049 if (!DoJVMTIVirtualThreadTransitions) { 4050 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4051 return; 4052 } 4053 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4054 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide); 4055 } else { 4056 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4057 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 4058 } 4059 #endif 4060 JVM_END 4061 4062 // Always update the temporary VTMS transition bit. 4063 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jclass clazz, jboolean hide)) 4064 #if INCLUDE_JVMTI 4065 if (!DoJVMTIVirtualThreadTransitions) { 4066 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4067 return; 4068 } 4069 assert(!thread->is_in_VTMS_transition(), "sanity check"); 4070 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check"); 4071 thread->toggle_is_in_tmp_VTMS_transition(); 4072 #endif 4073 JVM_END 4074 4075 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section. 4076 // Needed to avoid deadlocks with JVMTI suspend mechanism. 4077 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter)) 4078 #if INCLUDE_JVMTI 4079 if (!DoJVMTIVirtualThreadTransitions) { 4080 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4081 return; 4082 } 4083 assert(thread->is_disable_suspend() != (bool)enter, 4084 "nested or unbalanced monitor enter/exit is not allowed"); 4085 thread->toggle_is_disable_suspend(); 4086 #endif 4087 JVM_END 4088 4089 /* 4090 * Return the current class's class file version. The low order 16 bits of the 4091 * returned jint contain the class's major version. The high order 16 bits 4092 * contain the class's minor version. 4093 */ 4094 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 4095 oop mirror = JNIHandles::resolve_non_null(current); 4096 if (java_lang_Class::is_primitive(mirror)) { 4097 // return latest major version and minor version of 0. 4098 return JVM_CLASSFILE_MAJOR_VERSION; 4099 } 4100 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class"); 4101 4102 Klass* c = java_lang_Class::as_Klass(mirror); 4103 assert(c->is_instance_klass(), "must be"); 4104 InstanceKlass* ik = InstanceKlass::cast(c); 4105 return (ik->minor_version() << 16) | ik->major_version(); 4106 JVM_END 4107 4108 /* 4109 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 4110 * get the value will see a materialized value and not a scalar-replaced 4111 * null value. 4112 */ 4113 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 4114 JVM_EnsureMaterializedForStackWalk(env, value); 4115 JVM_END 4116 4117 /* 4118 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded. 4119 */ 4120 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void)) 4121 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE; 4122 JVM_END --- EOF ---