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 InstanceKlass* ik = InstanceKlass::cast(klass); 442 if (!ik->is_implicitly_constructible()) { 443 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not implicitly constructible"); 444 } 445 oop array = oopFactory::new_valueArray(ik, len, CHECK_NULL); 446 return (jarray) JNIHandles::make_local(THREAD, array); 447 JVM_END 448 449 450 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj)) 451 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj)); 452 return oop->is_null_free_array(); 453 JVM_END 454 455 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 456 457 extern volatile jint vm_created; 458 459 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 460 EventShutdown event; 461 if (event.should_commit()) { 462 event.set_reason("Shutdown requested from Java"); 463 event.commit(); 464 } 465 JVM_END 466 467 468 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 469 before_exit(thread, true); 470 vm_exit(code); 471 JVM_END 472 473 474 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 475 if (!DisableExplicitGC) { 476 EventSystemGC event; 477 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent); 478 Universe::heap()->collect(GCCause::_java_lang_system_gc); 479 event.commit(); 480 } 481 JVM_END 482 483 484 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 485 return Universe::heap()->millis_since_last_whole_heap_examined(); 486 JVM_END 487 488 489 static inline jlong convert_size_t_to_jlong(size_t val) { 490 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 491 NOT_LP64 (return (jlong)val;) 492 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 493 } 494 495 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 496 size_t n = Universe::heap()->capacity(); 497 return convert_size_t_to_jlong(n); 498 JVM_END 499 500 501 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 502 size_t n = Universe::heap()->unused(); 503 return convert_size_t_to_jlong(n); 504 JVM_END 505 506 507 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 508 size_t n = Universe::heap()->max_capacity(); 509 return convert_size_t_to_jlong(n); 510 JVM_END 511 512 513 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 514 return os::active_processor_count(); 515 JVM_END 516 517 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void)) 518 #ifdef LINUX 519 if (UseContainerSupport) { 520 return JNI_TRUE; 521 } 522 #endif 523 return JNI_FALSE; 524 JVM_END 525 526 JVM_LEAF(jboolean, JVM_IsContainerized(void)) 527 #ifdef LINUX 528 if (OSContainer::is_containerized()) { 529 return JNI_TRUE; 530 } 531 #endif 532 return JNI_FALSE; 533 JVM_END 534 535 // java.lang.Throwable ////////////////////////////////////////////////////// 536 537 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 538 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 539 java_lang_Throwable::fill_in_stack_trace(exception); 540 JVM_END 541 542 // java.lang.NullPointerException /////////////////////////////////////////// 543 544 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 545 if (!ShowCodeDetailsInExceptionMessages) return nullptr; 546 547 oop exc = JNIHandles::resolve_non_null(throwable); 548 549 Method* method; 550 int bci; 551 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 552 return nullptr; 553 } 554 if (method->is_native()) { 555 return nullptr; 556 } 557 558 stringStream ss; 559 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 560 if (ok) { 561 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 562 return (jstring) JNIHandles::make_local(THREAD, result); 563 } else { 564 return nullptr; 565 } 566 JVM_END 567 568 // java.lang.StackTraceElement ////////////////////////////////////////////// 569 570 571 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth)) 572 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace)); 573 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 574 objArrayHandle stack_trace(THREAD, st); 575 // Fill in the allocated stack trace 576 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK); 577 JVM_END 578 579 580 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 581 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 582 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 583 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK); 584 JVM_END 585 586 587 // java.lang.StackWalker ////////////////////////////////////////////////////// 588 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj)) 589 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj)); 590 591 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr); 592 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr); 593 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info()); 594 if (!have_name) { 595 oop name = StringTable::intern(method->name(), CHECK); 596 java_lang_StackFrameInfo::set_name(stack_frame_info(), name); 597 } 598 if (!have_type) { 599 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK); 600 java_lang_StackFrameInfo::set_type(stack_frame_info(), type()); 601 } 602 JVM_END 603 604 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode, 605 jint skip_frames, jobject contScope, jobject cont, 606 jint buffer_size, jint start_index, jobjectArray frames)) 607 if (!thread->has_last_Java_frame()) { 608 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr); 609 } 610 611 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 612 Handle contScope_h(THREAD, JNIHandles::resolve(contScope)); 613 Handle cont_h(THREAD, JNIHandles::resolve(cont)); 614 // frames array is a ClassFrameInfo[] array when only getting caller reference, 615 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 616 // be null. 617 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 618 objArrayHandle frames_array_h(THREAD, fa); 619 620 if (frames_array_h->length() < buffer_size) { 621 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr); 622 } 623 624 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h, 625 buffer_size, start_index, frames_array_h, CHECK_NULL); 626 return JNIHandles::make_local(THREAD, result); 627 JVM_END 628 629 630 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor, 631 jint last_batch_count, jint buffer_size, jint start_index, 632 jobjectArray frames)) 633 // frames array is a ClassFrameInfo[] array when only getting caller reference, 634 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 635 // be null. 636 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 637 objArrayHandle frames_array_h(THREAD, fa); 638 639 if (frames_array_h->length() < buffer_size) { 640 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 641 } 642 643 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 644 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size, 645 start_index, frames_array_h, THREAD); 646 JVM_END 647 648 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont)) 649 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 650 objArrayHandle frames_array_h(THREAD, fa); 651 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 652 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont)); 653 654 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD); 655 JVM_END 656 657 // java.lang.Object /////////////////////////////////////////////// 658 659 660 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 661 // as implemented in the classic virtual machine; return 0 if object is null 662 if (handle == nullptr) { 663 return 0; 664 } 665 oop obj = JNIHandles::resolve_non_null(handle); 666 if (EnableValhalla && obj->klass()->is_inline_klass()) { 667 JavaValue result(T_INT); 668 JavaCallArguments args; 669 Handle ho(THREAD, obj); 670 args.push_oop(ho); 671 methodHandle method(THREAD, Universe::value_object_hash_code_method()); 672 JavaCalls::call(&result, method, &args, THREAD); 673 if (HAS_PENDING_EXCEPTION) { 674 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) { 675 Handle e(THREAD, PENDING_EXCEPTION); 676 CLEAR_PENDING_EXCEPTION; 677 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false); 678 } 679 } 680 return result.get_jint(); 681 } else { 682 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj)); 683 } 684 JVM_END 685 686 687 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 688 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 689 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 690 if (JvmtiExport::should_post_monitor_wait()) { 691 JvmtiExport::post_monitor_wait(thread, obj(), ms); 692 693 // The current thread already owns the monitor and it has not yet 694 // been added to the wait queue so the current thread cannot be 695 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 696 // event handler cannot accidentally consume an unpark() meant for 697 // the ParkEvent associated with this ObjectMonitor. 698 } 699 ObjectSynchronizer::wait(obj, ms, CHECK); 700 JVM_END 701 702 703 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 704 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 705 ObjectSynchronizer::notify(obj, CHECK); 706 JVM_END 707 708 709 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 710 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 711 ObjectSynchronizer::notifyall(obj, CHECK); 712 JVM_END 713 714 715 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 716 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 717 Klass* klass = obj->klass(); 718 JvmtiVMObjectAllocEventCollector oam; 719 720 #ifdef ASSERT 721 // Just checking that the cloneable flag is set correct 722 if (obj->is_array()) { 723 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 724 } else { 725 guarantee(obj->is_instance(), "should be instanceOop"); 726 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 727 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 728 } 729 #endif 730 731 // Check if class of obj supports the Cloneable interface. 732 // All arrays are considered to be cloneable (See JLS 20.1.5). 733 // All j.l.r.Reference classes are considered non-cloneable. 734 if (!klass->is_cloneable() || 735 (klass->is_instance_klass() && 736 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 737 ResourceMark rm(THREAD); 738 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 739 } 740 741 if (klass->is_inline_klass()) { 742 // Value instances have no identity, so return the current instance instead of allocating a new one 743 // Value classes cannot have finalizers, so the method can return immediately 744 return JNIHandles::make_local(THREAD, obj()); 745 } 746 747 // Make shallow object copy 748 const size_t size = obj->size(); 749 oop new_obj_oop = nullptr; 750 if (obj->is_array()) { 751 const int length = ((arrayOop)obj())->length(); 752 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 753 /* do_zero */ true, CHECK_NULL); 754 } else { 755 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 756 } 757 758 HeapAccess<>::clone(obj(), new_obj_oop, size); 759 760 Handle new_obj(THREAD, new_obj_oop); 761 // Caution: this involves a java upcall, so the clone should be 762 // "gc-robust" by this stage. 763 if (klass->has_finalizer()) { 764 assert(obj->is_instance(), "should be instanceOop"); 765 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 766 new_obj = Handle(THREAD, new_obj_oop); 767 } 768 769 return JNIHandles::make_local(THREAD, new_obj()); 770 JVM_END 771 772 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 773 774 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 775 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 776 JVM_END 777 778 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 779 return InstanceKlass::is_finalization_enabled(); 780 JVM_END 781 782 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 783 784 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 785 CONT_RegisterNativeMethods(env, cls); 786 JVM_END 787 788 // java.io.File /////////////////////////////////////////////////////////////// 789 790 JVM_LEAF(char*, JVM_NativePath(char* path)) 791 return os::native_path(path); 792 JVM_END 793 794 795 // Misc. class handling /////////////////////////////////////////////////////////// 796 797 798 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 799 // Getting the class of the caller frame. 800 // 801 // The call stack at this point looks something like this: 802 // 803 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ] 804 // [1] [ @CallerSensitive API.method ] 805 // [.] [ (skipped intermediate frames) ] 806 // [n] [ caller ] 807 vframeStream vfst(thread); 808 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 809 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 810 Method* m = vfst.method(); 811 assert(m != nullptr, "sanity"); 812 switch (n) { 813 case 0: 814 // This must only be called from Reflection.getCallerClass 815 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 816 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 817 } 818 // fall-through 819 case 1: 820 // Frame 0 and 1 must be caller sensitive. 821 if (!m->caller_sensitive()) { 822 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 823 } 824 break; 825 default: 826 if (!m->is_ignored_by_security_stack_walk()) { 827 // We have reached the desired frame; return the holder class. 828 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 829 } 830 break; 831 } 832 } 833 return nullptr; 834 JVM_END 835 836 837 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 838 oop mirror = nullptr; 839 BasicType t = name2type(utf); 840 if (t != T_ILLEGAL && !is_reference_type(t)) { 841 mirror = Universe::java_mirror(t); 842 } 843 if (mirror == nullptr) { 844 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 845 } else { 846 return (jclass) JNIHandles::make_local(THREAD, mirror); 847 } 848 JVM_END 849 850 851 // Returns a class loaded by the bootstrap class loader; or null 852 // if not found. ClassNotFoundException is not thrown. 853 // FindClassFromBootLoader is exported to the launcher for windows. 854 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 855 const char* name)) 856 // Java libraries should ensure that name is never null or illegal. 857 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 858 // It's impossible to create this class; the name cannot fit 859 // into the constant pool. 860 return nullptr; 861 } 862 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name"); 863 864 TempNewSymbol h_name = SymbolTable::new_symbol(name); 865 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 866 if (k == nullptr) { 867 return nullptr; 868 } 869 870 if (log_is_enabled(Debug, class, resolve)) { 871 trace_class_resolution(k); 872 } 873 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 874 JVM_END 875 876 // Find a class with this name in this loader, using the caller's protection domain. 877 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 878 jboolean init, jobject loader, 879 jclass caller)) 880 TempNewSymbol h_name = 881 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 882 CHECK_NULL); 883 884 oop loader_oop = JNIHandles::resolve(loader); 885 oop from_class = JNIHandles::resolve(caller); 886 oop protection_domain = nullptr; 887 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 888 // NPE. Put it in another way, the bootstrap class loader has all permission and 889 // thus no checkPackageAccess equivalence in the VM class loader. 890 // The caller is also passed as null by the java code if there is no security 891 // manager to avoid the performance cost of getting the calling class. 892 if (from_class != nullptr && loader_oop != nullptr) { 893 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 894 } 895 896 Handle h_loader(THREAD, loader_oop); 897 Handle h_prot(THREAD, protection_domain); 898 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 899 h_prot, false, THREAD); 900 901 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 902 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 903 } 904 return result; 905 JVM_END 906 907 // Currently only called from the old verifier. 908 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 909 jboolean init, jclass from)) 910 TempNewSymbol h_name = 911 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 912 CHECK_NULL); 913 oop from_class_oop = JNIHandles::resolve(from); 914 Klass* from_class = (from_class_oop == nullptr) 915 ? (Klass*)nullptr 916 : java_lang_Class::as_Klass(from_class_oop); 917 oop class_loader = nullptr; 918 oop protection_domain = nullptr; 919 if (from_class != nullptr) { 920 class_loader = from_class->class_loader(); 921 protection_domain = from_class->protection_domain(); 922 } 923 Handle h_loader(THREAD, class_loader); 924 Handle h_prot (THREAD, protection_domain); 925 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 926 h_prot, true, thread); 927 928 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 929 // this function is generally only used for class loading during verification. 930 ResourceMark rm; 931 oop from_mirror = JNIHandles::resolve_non_null(from); 932 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 933 const char * from_name = from_class->external_name(); 934 935 oop mirror = JNIHandles::resolve_non_null(result); 936 Klass* to_class = java_lang_Class::as_Klass(mirror); 937 const char * to = to_class->external_name(); 938 log_debug(class, resolve)("%s %s (verification)", from_name, to); 939 } 940 941 return result; 942 JVM_END 943 944 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 945 static jclass jvm_define_class_common(const char *name, 946 jobject loader, const jbyte *buf, 947 jsize len, jobject pd, const char *source, 948 TRAPS) { 949 if (source == nullptr) source = "__JVM_DefineClass__"; 950 951 JavaThread* jt = THREAD; 952 953 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 954 ClassLoader::perf_define_appclass_selftime(), 955 ClassLoader::perf_define_appclasses(), 956 jt->get_thread_stat()->perf_recursion_counts_addr(), 957 jt->get_thread_stat()->perf_timers_addr(), 958 PerfClassTraceTime::DEFINE_CLASS); 959 960 if (UsePerfData) { 961 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 962 } 963 964 // Class resolution will get the class name from the .class stream if the name is null. 965 TempNewSymbol class_name = name == nullptr ? nullptr : 966 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 967 CHECK_NULL); 968 969 ResourceMark rm(THREAD); 970 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 971 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 972 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 973 ClassLoadInfo cl_info(protection_domain); 974 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 975 class_loader, 976 cl_info, 977 CHECK_NULL); 978 979 if (log_is_enabled(Debug, class, resolve)) { 980 trace_class_resolution(k); 981 } 982 983 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 984 } 985 986 enum { 987 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 988 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 989 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 990 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 991 }; 992 993 /* 994 * Define a class with the specified flags that indicates if it's a nestmate, 995 * hidden, or strongly referenced from class loader. 996 */ 997 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 998 const jbyte *buf, jsize len, jobject pd, 999 jboolean init, int flags, jobject classData, TRAPS) { 1000 ResourceMark rm(THREAD); 1001 1002 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup)); 1003 // Lookup class must be a non-null instance 1004 if (lookup_k == nullptr) { 1005 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1006 } 1007 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass"); 1008 1009 Handle class_loader (THREAD, lookup_k->class_loader()); 1010 1011 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 1012 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1013 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1014 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1015 1016 InstanceKlass* host_class = nullptr; 1017 if (is_nestmate) { 1018 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL); 1019 } 1020 1021 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1022 name, 1023 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1024 is_nestmate ? host_class->external_name() : "", 1025 is_hidden ? "hidden" : "not hidden", 1026 is_strong ? "strong" : "weak", 1027 vm_annotations ? "with vm annotations" : "without vm annotation"); 1028 1029 if (!is_hidden) { 1030 // classData is only applicable for hidden classes 1031 if (classData != nullptr) { 1032 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1033 } 1034 if (is_nestmate) { 1035 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1036 } 1037 if (!is_strong) { 1038 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1039 } 1040 if (vm_annotations) { 1041 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1042 } 1043 if (flags != STRONG_LOADER_LINK) { 1044 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1045 err_msg("invalid flag 0x%x", flags)); 1046 } 1047 } 1048 1049 // Class resolution will get the class name from the .class stream if the name is null. 1050 TempNewSymbol class_name = name == nullptr ? nullptr : 1051 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1052 CHECK_NULL); 1053 1054 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1055 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1056 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 1057 1058 InstanceKlass* ik = nullptr; 1059 if (!is_hidden) { 1060 ClassLoadInfo cl_info(protection_domain); 1061 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1062 class_loader, 1063 cl_info, 1064 CHECK_NULL); 1065 1066 if (log_is_enabled(Debug, class, resolve)) { 1067 trace_class_resolution(ik); 1068 } 1069 } else { // hidden 1070 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1071 ClassLoadInfo cl_info(protection_domain, 1072 host_class, 1073 classData_h, 1074 is_hidden, 1075 is_strong, 1076 vm_annotations); 1077 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1078 class_loader, 1079 cl_info, 1080 CHECK_NULL); 1081 1082 // The hidden class loader data has been artificially been kept alive to 1083 // this point. The mirror and any instances of this class have to keep 1084 // it alive afterwards. 1085 ik->class_loader_data()->dec_keep_alive_ref_count(); 1086 1087 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1088 ModuleEntry* module = ik->module(); 1089 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1090 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1091 module_name, 1092 ik->external_name(), 1093 host_class->external_name(), 1094 ik->is_hidden() ? "is hidden" : "is not hidden"); 1095 } 1096 } 1097 1098 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) { 1099 // non-hidden class or nestmate class must be in the same package as the Lookup class 1100 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages"); 1101 } 1102 1103 if (init) { 1104 ik->initialize(CHECK_NULL); 1105 } else { 1106 ik->link_class(CHECK_NULL); 1107 } 1108 1109 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1110 } 1111 1112 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1113 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1114 JVM_END 1115 1116 /* 1117 * Define a class with the specified lookup class. 1118 * lookup: Lookup class 1119 * name: the name of the class 1120 * buf: class bytes 1121 * len: length of class bytes 1122 * pd: protection domain 1123 * init: initialize the class 1124 * flags: properties of the class 1125 * classData: private static pre-initialized field 1126 */ 1127 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1128 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1129 1130 if (lookup == nullptr) { 1131 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1132 } 1133 1134 assert(buf != nullptr, "buf must not be null"); 1135 1136 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1137 JVM_END 1138 1139 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1140 1141 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1142 JVM_END 1143 1144 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1145 ResourceMark rm(THREAD); 1146 1147 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1148 char* str = java_lang_String::as_utf8_string(h_name()); 1149 1150 // Sanity check, don't expect null 1151 if (str == nullptr) return nullptr; 1152 1153 // Internalize the string, converting '.' to '/' in string. 1154 char* p = (char*)str; 1155 while (*p != '\0') { 1156 if (*p == '.') { 1157 *p = '/'; 1158 } 1159 p++; 1160 } 1161 1162 const int str_len = (int)(p - str); 1163 if (str_len > Symbol::max_length()) { 1164 // It's impossible to create this class; the name cannot fit 1165 // into the constant pool. 1166 return nullptr; 1167 } 1168 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1169 1170 // Security Note: 1171 // The Java level wrapper will perform the necessary security check allowing 1172 // us to pass the null as the initiating class loader. 1173 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1174 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, 1175 h_loader, 1176 Handle()); 1177 #if INCLUDE_CDS 1178 if (k == nullptr) { 1179 // If the class is not already loaded, try to see if it's in the shared 1180 // archive for the current classloader (h_loader). 1181 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1182 } 1183 #endif 1184 return (k == nullptr) ? nullptr : 1185 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1186 JVM_END 1187 1188 // Module support ////////////////////////////////////////////////////////////////////////////// 1189 1190 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1191 jstring location, jobjectArray packages)) 1192 Handle h_module (THREAD, JNIHandles::resolve(module)); 1193 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1194 JVM_END 1195 1196 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1197 Handle h_module (THREAD, JNIHandles::resolve(module)); 1198 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1199 JVM_END 1200 1201 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1202 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1203 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1204 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1205 JVM_END 1206 1207 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1208 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1209 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1210 JVM_END 1211 1212 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1213 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1214 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1215 JVM_END 1216 1217 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1218 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1219 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1220 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1221 JVM_END 1222 1223 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1224 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1225 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1226 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1227 JVM_END 1228 1229 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1230 1231 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1232 assert (cls != nullptr, "illegal class"); 1233 JvmtiVMObjectAllocEventCollector oam; 1234 ResourceMark rm(THREAD); 1235 HandleMark hm(THREAD); 1236 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1237 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1238 return (jstring) JNIHandles::make_local(THREAD, result); 1239 JVM_END 1240 1241 1242 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1243 JvmtiVMObjectAllocEventCollector oam; 1244 oop mirror = JNIHandles::resolve_non_null(cls); 1245 1246 // Special handling for primitive objects 1247 if (java_lang_Class::is_primitive(mirror)) { 1248 // Primitive objects does not have any interfaces 1249 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1250 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1251 } 1252 1253 Klass* klass = java_lang_Class::as_Klass(mirror); 1254 // Figure size of result array 1255 int size; 1256 if (klass->is_instance_klass()) { 1257 InstanceKlass* ik = InstanceKlass::cast(klass); 1258 size = ik->local_interfaces()->length(); 1259 } else { 1260 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass"); 1261 size = 2; 1262 } 1263 1264 // Allocate result array 1265 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1266 objArrayHandle result (THREAD, r); 1267 // Fill in result 1268 if (klass->is_instance_klass()) { 1269 // Regular instance klass, fill in all local interfaces 1270 for (int index = 0; index < size; index++) { 1271 InstanceKlass* ik = InstanceKlass::cast(klass); 1272 Klass* k = ik->local_interfaces()->at(index); 1273 result->obj_at_put(index, k->java_mirror()); 1274 } 1275 } else { 1276 // All arrays implement java.lang.Cloneable and java.io.Serializable 1277 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1278 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1279 } 1280 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1281 JVM_END 1282 1283 1284 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1285 oop mirror = JNIHandles::resolve_non_null(cls); 1286 if (java_lang_Class::is_primitive(mirror)) { 1287 return JNI_FALSE; 1288 } 1289 Klass* k = java_lang_Class::as_Klass(mirror); 1290 jboolean result = k->is_interface(); 1291 assert(!result || k->is_instance_klass(), 1292 "all interfaces are instance types"); 1293 // The compiler intrinsic for isInterface tests the 1294 // Klass::_access_flags bits in the same way. 1295 return result; 1296 JVM_END 1297 1298 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1299 oop mirror = JNIHandles::resolve_non_null(cls); 1300 if (java_lang_Class::is_primitive(mirror)) { 1301 return JNI_FALSE; 1302 } 1303 Klass* k = java_lang_Class::as_Klass(mirror); 1304 return k->is_hidden(); 1305 JVM_END 1306 1307 JVM_ENTRY(jboolean, JVM_IsIdentityClass(JNIEnv *env, jclass cls)) 1308 oop mirror = JNIHandles::resolve_non_null(cls); 1309 if (java_lang_Class::is_primitive(mirror)) { 1310 return JNI_FALSE; 1311 } 1312 Klass* k = java_lang_Class::as_Klass(mirror); 1313 if (EnableValhalla) { 1314 return k->is_array_klass() || k->is_identity_class(); 1315 } else { 1316 return k->is_interface() ? JNI_FALSE : JNI_TRUE; 1317 } 1318 JVM_END 1319 1320 JVM_ENTRY(jboolean, JVM_IsImplicitlyConstructibleClass(JNIEnv *env, jclass cls)) 1321 oop mirror = JNIHandles::resolve_non_null(cls); 1322 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1323 return ik->is_implicitly_constructible(); 1324 JVM_END 1325 1326 1327 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1328 oop mirror = JNIHandles::resolve_non_null(cls); 1329 if (mirror == nullptr) { 1330 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 1331 } 1332 1333 if (java_lang_Class::is_primitive(mirror)) { 1334 // Primitive types does not have a protection domain. 1335 return nullptr; 1336 } 1337 1338 oop pd = java_lang_Class::protection_domain(mirror); 1339 return (jobject) JNIHandles::make_local(THREAD, pd); 1340 JVM_END 1341 1342 1343 // Returns the inherited_access_control_context field of the running thread. 1344 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1345 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1346 return JNIHandles::make_local(THREAD, result); 1347 JVM_END 1348 1349 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1350 if (!UsePrivilegedStack) return nullptr; 1351 1352 ResourceMark rm(THREAD); 1353 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1354 JvmtiVMObjectAllocEventCollector oam; 1355 1356 // count the protection domains on the execution stack. We collapse 1357 // duplicate consecutive protection domains into a single one, as 1358 // well as stopping when we hit a privileged frame. 1359 1360 oop previous_protection_domain = nullptr; 1361 Handle privileged_context(thread, nullptr); 1362 bool is_privileged = false; 1363 oop protection_domain = nullptr; 1364 1365 // Iterate through Java frames 1366 vframeStream vfst(thread); 1367 for(; !vfst.at_end(); vfst.next()) { 1368 // get method of frame 1369 Method* method = vfst.method(); 1370 1371 // stop at the first privileged frame 1372 if (method->method_holder() == vmClasses::AccessController_klass() && 1373 method->name() == vmSymbols::executePrivileged_name()) 1374 { 1375 // this frame is privileged 1376 is_privileged = true; 1377 1378 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1379 1380 StackValueCollection* locals = priv->locals(); 1381 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1382 StackValue* clr_sv = locals->at(2); // Class<?> caller 1383 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1384 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1385 privileged_context = ctx_sv->get_obj(); 1386 Handle caller = clr_sv->get_obj(); 1387 1388 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1389 protection_domain = caller_klass->protection_domain(); 1390 } else { 1391 protection_domain = method->method_holder()->protection_domain(); 1392 } 1393 1394 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) { 1395 local_array->push(Handle(thread, protection_domain)); 1396 previous_protection_domain = protection_domain; 1397 } 1398 1399 if (is_privileged) break; 1400 } 1401 1402 1403 // either all the domains on the stack were system domains, or 1404 // we had a privileged system domain 1405 if (local_array->is_empty()) { 1406 if (is_privileged && privileged_context.is_null()) return nullptr; 1407 1408 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1409 return JNIHandles::make_local(THREAD, result); 1410 } 1411 1412 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(), 1413 local_array->length(), CHECK_NULL); 1414 objArrayHandle h_context(thread, context); 1415 for (int index = 0; index < local_array->length(); index++) { 1416 h_context->obj_at_put(index, local_array->at(index)()); 1417 } 1418 1419 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1420 1421 return JNIHandles::make_local(THREAD, result); 1422 JVM_END 1423 1424 class ScopedValueBindingsResolver { 1425 public: 1426 InstanceKlass* Carrier_klass; 1427 ScopedValueBindingsResolver(JavaThread* THREAD) { 1428 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD); 1429 Carrier_klass = InstanceKlass::cast(k); 1430 } 1431 }; 1432 1433 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1434 ResourceMark rm(THREAD); 1435 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1436 JvmtiVMObjectAllocEventCollector oam; 1437 1438 static ScopedValueBindingsResolver resolver(THREAD); 1439 1440 // Iterate through Java frames 1441 vframeStream vfst(thread); 1442 for(; !vfst.at_end(); vfst.next()) { 1443 int loc = -1; 1444 // get method of frame 1445 Method* method = vfst.method(); 1446 1447 Symbol *name = method->name(); 1448 1449 InstanceKlass* holder = method->method_holder(); 1450 if (name == vmSymbols::runWith_method_name()) { 1451 if (holder == vmClasses::Thread_klass() 1452 || holder == resolver.Carrier_klass) { 1453 loc = 1; 1454 } 1455 } 1456 1457 if (loc != -1) { 1458 javaVFrame *frame = vfst.asJavaVFrame(); 1459 StackValueCollection* locals = frame->locals(); 1460 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot 1461 Handle result = head_sv->get_obj(); 1462 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1463 if (result() != nullptr) { 1464 return JNIHandles::make_local(THREAD, result()); 1465 } 1466 } 1467 } 1468 1469 return nullptr; 1470 JVM_END 1471 1472 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1473 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1474 return (k != nullptr) && k->is_array_klass() ? true : false; 1475 JVM_END 1476 1477 1478 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1479 oop mirror = JNIHandles::resolve_non_null(cls); 1480 return (jboolean) java_lang_Class::is_primitive(mirror); 1481 JVM_END 1482 1483 1484 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1485 oop mirror = JNIHandles::resolve_non_null(cls); 1486 if (java_lang_Class::is_primitive(mirror)) { 1487 // Primitive type 1488 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1489 } 1490 1491 Klass* k = java_lang_Class::as_Klass(mirror); 1492 debug_only(int computed_modifiers = k->compute_modifier_flags()); 1493 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1494 return k->modifier_flags(); 1495 JVM_END 1496 1497 1498 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1499 1500 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1501 JvmtiVMObjectAllocEventCollector oam; 1502 // ofClass is a reference to a java_lang_Class object. The mirror object 1503 // of an InstanceKlass 1504 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1505 if (java_lang_Class::is_primitive(ofMirror) || 1506 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1507 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1508 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1509 } 1510 1511 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1512 InnerClassesIterator iter(k); 1513 1514 if (iter.length() == 0) { 1515 // Neither an inner nor outer class 1516 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1517 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1518 } 1519 1520 // find inner class info 1521 constantPoolHandle cp(thread, k->constants()); 1522 int length = iter.length(); 1523 1524 // Allocate temp. result array 1525 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL); 1526 objArrayHandle result (THREAD, r); 1527 int members = 0; 1528 1529 for (; !iter.done(); iter.next()) { 1530 int ioff = iter.inner_class_info_index(); 1531 int ooff = iter.outer_class_info_index(); 1532 1533 if (ioff != 0 && ooff != 0) { 1534 // Check to see if the name matches the class we're looking for 1535 // before attempting to find the class. 1536 if (cp->klass_name_at_matches(k, ooff)) { 1537 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1538 if (outer_klass == k) { 1539 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1540 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1541 1542 // Throws an exception if outer klass has not declared k as 1543 // an inner klass 1544 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1545 1546 result->obj_at_put(members, inner_klass->java_mirror()); 1547 members++; 1548 } 1549 } 1550 } 1551 } 1552 1553 if (members != length) { 1554 // Return array of right length 1555 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL); 1556 for(int i = 0; i < members; i++) { 1557 res->obj_at_put(i, result->obj_at(i)); 1558 } 1559 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1560 } 1561 1562 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1563 JVM_END 1564 1565 1566 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1567 { 1568 // ofClass is a reference to a java_lang_Class object. 1569 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1570 if (java_lang_Class::is_primitive(ofMirror)) { 1571 return nullptr; 1572 } 1573 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1574 if (!klass->is_instance_klass()) { 1575 return nullptr; 1576 } 1577 1578 bool inner_is_member = false; 1579 Klass* outer_klass 1580 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1581 if (outer_klass == nullptr) return nullptr; // already a top-level class 1582 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1583 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1584 } 1585 JVM_END 1586 1587 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1588 { 1589 oop mirror = JNIHandles::resolve_non_null(cls); 1590 if (java_lang_Class::is_primitive(mirror)) { 1591 return nullptr; 1592 } 1593 Klass* klass = java_lang_Class::as_Klass(mirror); 1594 if (!klass->is_instance_klass()) { 1595 return nullptr; 1596 } 1597 InstanceKlass* k = InstanceKlass::cast(klass); 1598 int ooff = 0, noff = 0; 1599 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1600 if (noff != 0) { 1601 constantPoolHandle i_cp(thread, k->constants()); 1602 Symbol* name = i_cp->symbol_at(noff); 1603 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1604 return (jstring) JNIHandles::make_local(THREAD, str()); 1605 } 1606 } 1607 return nullptr; 1608 } 1609 JVM_END 1610 1611 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1612 assert (cls != nullptr, "illegal class"); 1613 JvmtiVMObjectAllocEventCollector oam; 1614 ResourceMark rm(THREAD); 1615 oop mirror = JNIHandles::resolve_non_null(cls); 1616 // Return null for arrays and primitives 1617 if (!java_lang_Class::is_primitive(mirror)) { 1618 Klass* k = java_lang_Class::as_Klass(mirror); 1619 if (k->is_instance_klass()) { 1620 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1621 if (sym == nullptr) return nullptr; 1622 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1623 return (jstring) JNIHandles::make_local(THREAD, str()); 1624 } 1625 } 1626 return nullptr; 1627 JVM_END 1628 1629 1630 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1631 assert (cls != nullptr, "illegal class"); 1632 oop mirror = JNIHandles::resolve_non_null(cls); 1633 // Return null for arrays and primitives 1634 if (!java_lang_Class::is_primitive(mirror)) { 1635 Klass* k = java_lang_Class::as_Klass(mirror); 1636 if (k->is_instance_klass()) { 1637 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1638 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1639 } 1640 } 1641 return nullptr; 1642 JVM_END 1643 1644 1645 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1646 // some of this code was adapted from from jni_FromReflectedField 1647 1648 oop reflected = JNIHandles::resolve_non_null(field); 1649 oop mirror = java_lang_reflect_Field::clazz(reflected); 1650 Klass* k = java_lang_Class::as_Klass(mirror); 1651 int slot = java_lang_reflect_Field::slot(reflected); 1652 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1653 1654 InstanceKlass* ik = InstanceKlass::cast(k); 1655 int offset = ik->field_offset(slot); 1656 1657 if (modifiers & JVM_ACC_STATIC) { 1658 // for static fields we only look in the current class 1659 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1660 assert(false, "cannot find static field"); 1661 return false; 1662 } 1663 } else { 1664 // for instance fields we start with the current class and work 1665 // our way up through the superclass chain 1666 if (!ik->find_field_from_offset(offset, false, &fd)) { 1667 assert(false, "cannot find instance field"); 1668 return false; 1669 } 1670 } 1671 return true; 1672 } 1673 1674 static Method* jvm_get_method_common(jobject method) { 1675 // some of this code was adapted from from jni_FromReflectedMethod 1676 1677 oop reflected = JNIHandles::resolve_non_null(method); 1678 oop mirror = nullptr; 1679 int slot = 0; 1680 1681 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1682 mirror = java_lang_reflect_Constructor::clazz(reflected); 1683 slot = java_lang_reflect_Constructor::slot(reflected); 1684 } else { 1685 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1686 "wrong type"); 1687 mirror = java_lang_reflect_Method::clazz(reflected); 1688 slot = java_lang_reflect_Method::slot(reflected); 1689 } 1690 Klass* k = java_lang_Class::as_Klass(mirror); 1691 1692 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1693 assert(m != nullptr, "cannot find method"); 1694 return m; // caller has to deal with null in product mode 1695 } 1696 1697 /* Type use annotations support (JDK 1.8) */ 1698 1699 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1700 assert (cls != nullptr, "illegal class"); 1701 ResourceMark rm(THREAD); 1702 // Return null for arrays and primitives 1703 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1704 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1705 if (k->is_instance_klass()) { 1706 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1707 if (type_annotations != nullptr) { 1708 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1709 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1710 } 1711 } 1712 } 1713 return nullptr; 1714 JVM_END 1715 1716 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1717 assert (method != nullptr, "illegal method"); 1718 // method is a handle to a java.lang.reflect.Method object 1719 Method* m = jvm_get_method_common(method); 1720 if (m == nullptr) { 1721 return nullptr; 1722 } 1723 1724 AnnotationArray* type_annotations = m->type_annotations(); 1725 if (type_annotations != nullptr) { 1726 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1727 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1728 } 1729 1730 return nullptr; 1731 JVM_END 1732 1733 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1734 assert (field != nullptr, "illegal field"); 1735 fieldDescriptor fd; 1736 bool gotFd = jvm_get_field_common(field, fd); 1737 if (!gotFd) { 1738 return nullptr; 1739 } 1740 1741 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1742 JVM_END 1743 1744 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1745 if (!cp->is_within_bounds(index)) { 1746 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1747 } 1748 } 1749 1750 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1751 { 1752 // method is a handle to a java.lang.reflect.Method object 1753 Method* method_ptr = jvm_get_method_common(method); 1754 methodHandle mh (THREAD, method_ptr); 1755 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1756 const int num_params = mh->method_parameters_length(); 1757 1758 if (num_params < 0) { 1759 // A -1 return value from method_parameters_length means there is no 1760 // parameter data. Return null to indicate this to the reflection 1761 // API. 1762 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1763 return (jobjectArray)nullptr; 1764 } else { 1765 // Otherwise, we return something up to reflection, even if it is 1766 // a zero-length array. Why? Because in some cases this can 1767 // trigger a MalformedParametersException. 1768 1769 // make sure all the symbols are properly formatted 1770 for (int i = 0; i < num_params; i++) { 1771 MethodParametersElement* params = mh->method_parameters_start(); 1772 int index = params[i].name_cp_index; 1773 constantPoolHandle cp(THREAD, mh->constants()); 1774 bounds_check(cp, index, CHECK_NULL); 1775 1776 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1777 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1778 "Wrong type at constant pool index"); 1779 } 1780 1781 } 1782 1783 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1784 objArrayHandle result (THREAD, result_oop); 1785 1786 for (int i = 0; i < num_params; i++) { 1787 MethodParametersElement* params = mh->method_parameters_start(); 1788 // For a 0 index, give a null symbol 1789 Symbol* sym = 0 != params[i].name_cp_index ? 1790 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1791 int flags = params[i].flags; 1792 oop param = Reflection::new_parameter(reflected_method, i, sym, 1793 flags, CHECK_NULL); 1794 result->obj_at_put(i, param); 1795 } 1796 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1797 } 1798 } 1799 JVM_END 1800 1801 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1802 1803 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1804 { 1805 JvmtiVMObjectAllocEventCollector oam; 1806 1807 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1808 // Exclude primitive types and array types 1809 if (java_lang_Class::is_primitive(ofMirror) || 1810 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1811 // Return empty array 1812 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1813 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1814 } 1815 1816 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1817 constantPoolHandle cp(THREAD, k->constants()); 1818 1819 // Ensure class is linked 1820 k->link_class(CHECK_NULL); 1821 1822 // Allocate result 1823 int num_fields; 1824 1825 if (publicOnly) { 1826 num_fields = 0; 1827 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1828 if (fs.access_flags().is_public()) ++num_fields; 1829 } 1830 } else { 1831 num_fields = k->java_fields_count(); 1832 } 1833 1834 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1835 objArrayHandle result (THREAD, r); 1836 1837 int out_idx = 0; 1838 fieldDescriptor fd; 1839 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1840 if (!publicOnly || fs.access_flags().is_public()) { 1841 fd.reinitialize(k, fs.index()); 1842 oop field = Reflection::new_field(&fd, CHECK_NULL); 1843 result->obj_at_put(out_idx, field); 1844 ++out_idx; 1845 } 1846 } 1847 assert(out_idx == num_fields, "just checking"); 1848 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1849 } 1850 JVM_END 1851 1852 // A class is a record if and only if it is final and a direct subclass of 1853 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1854 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1855 { 1856 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1857 if (k != nullptr && k->is_instance_klass()) { 1858 InstanceKlass* ik = InstanceKlass::cast(k); 1859 return ik->is_record(); 1860 } else { 1861 return false; 1862 } 1863 } 1864 JVM_END 1865 1866 // Returns an array containing the components of the Record attribute, 1867 // or null if the attribute is not present. 1868 // 1869 // Note that this function returns the components of the Record attribute 1870 // even if the class is not a record. 1871 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1872 { 1873 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1874 assert(c->is_instance_klass(), "must be"); 1875 InstanceKlass* ik = InstanceKlass::cast(c); 1876 1877 Array<RecordComponent*>* components = ik->record_components(); 1878 if (components != nullptr) { 1879 JvmtiVMObjectAllocEventCollector oam; 1880 constantPoolHandle cp(THREAD, ik->constants()); 1881 int length = components->length(); 1882 assert(length >= 0, "unexpected record_components length"); 1883 objArrayOop record_components = 1884 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1885 objArrayHandle components_h (THREAD, record_components); 1886 1887 for (int x = 0; x < length; x++) { 1888 RecordComponent* component = components->at(x); 1889 assert(component != nullptr, "unexpected null record component"); 1890 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1891 components_h->obj_at_put(x, component_oop); 1892 } 1893 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1894 } 1895 1896 return nullptr; 1897 } 1898 JVM_END 1899 1900 static bool select_method(const methodHandle& method, bool want_constructor) { 1901 bool is_ctor = (method->is_object_constructor()); 1902 if (want_constructor) { 1903 return is_ctor; 1904 } else { 1905 return (!is_ctor && 1906 !method->is_class_initializer() && 1907 !method->is_overpass()); 1908 } 1909 } 1910 1911 static jobjectArray get_class_declared_methods_helper( 1912 JNIEnv *env, 1913 jclass ofClass, jboolean publicOnly, 1914 bool want_constructor, 1915 Klass* klass, TRAPS) { 1916 1917 JvmtiVMObjectAllocEventCollector oam; 1918 1919 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1920 // Exclude primitive types and array types 1921 if (java_lang_Class::is_primitive(ofMirror) 1922 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1923 // Return empty array 1924 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1925 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1926 } 1927 1928 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1929 1930 // Ensure class is linked 1931 k->link_class(CHECK_NULL); 1932 1933 Array<Method*>* methods = k->methods(); 1934 int methods_length = methods->length(); 1935 1936 // Save original method_idnum in case of redefinition, which can change 1937 // the idnum of obsolete methods. The new method will have the same idnum 1938 // but if we refresh the methods array, the counts will be wrong. 1939 ResourceMark rm(THREAD); 1940 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1941 int num_methods = 0; 1942 1943 for (int i = 0; i < methods_length; i++) { 1944 methodHandle method(THREAD, methods->at(i)); 1945 if (select_method(method, want_constructor)) { 1946 if (!publicOnly || method->is_public()) { 1947 idnums->push(method->method_idnum()); 1948 ++num_methods; 1949 } 1950 } 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_is_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_is_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 // Ensure that the C++ Thread and OSThread structures aren't freed before 3063 // we operate. 3064 MutexLocker mu(Threads_lock); 3065 3066 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 3067 // re-starting an already started thread, so we should usually find 3068 // that the JavaThread is null. However for a JNI attached thread 3069 // there is a small window between the Thread object being created 3070 // (with its JavaThread set) and the update to its threadStatus, so we 3071 // have to check for this 3072 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 3073 throw_illegal_thread_state = true; 3074 } else { 3075 jlong size = 3076 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 3077 // Allocate the C++ Thread structure and create the native thread. The 3078 // stack size retrieved from java is 64-bit signed, but the constructor takes 3079 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 3080 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 3081 // - Avoid passing negative values which would result in really large stacks. 3082 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 3083 size_t sz = size > 0 ? (size_t) size : 0; 3084 native_thread = new JavaThread(&thread_entry, sz); 3085 3086 // At this point it may be possible that no osthread was created for the 3087 // JavaThread due to lack of memory. Check for this situation and throw 3088 // an exception if necessary. Eventually we may want to change this so 3089 // that we only grab the lock if the thread was created successfully - 3090 // then we can also do this check and throw the exception in the 3091 // JavaThread constructor. 3092 if (native_thread->osthread() != nullptr) { 3093 // Note: the current thread is not being used within "prepare". 3094 native_thread->prepare(jthread); 3095 } 3096 } 3097 } 3098 3099 if (throw_illegal_thread_state) { 3100 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3101 } 3102 3103 assert(native_thread != nullptr, "Starting null thread?"); 3104 3105 if (native_thread->osthread() == nullptr) { 3106 ResourceMark rm(thread); 3107 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 3108 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 3109 // No one should hold a reference to the 'native_thread'. 3110 native_thread->smr_delete(); 3111 if (JvmtiExport::should_post_resource_exhausted()) { 3112 JvmtiExport::post_resource_exhausted( 3113 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3114 os::native_thread_creation_failed_msg()); 3115 } 3116 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3117 os::native_thread_creation_failed_msg()); 3118 } 3119 3120 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3121 3122 Thread::start(native_thread); 3123 3124 JVM_END 3125 3126 3127 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3128 ThreadsListHandle tlh(thread); 3129 oop java_thread = nullptr; 3130 JavaThread* receiver = nullptr; 3131 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3132 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3133 3134 if (is_alive) { 3135 // jthread refers to a live JavaThread. 3136 Thread::set_priority(receiver, (ThreadPriority)prio); 3137 } 3138 // Implied else: If the JavaThread hasn't started yet, then the 3139 // priority set in the java.lang.Thread object above will be pushed 3140 // down when it does start. 3141 JVM_END 3142 3143 3144 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3145 if (os::dont_yield()) return; 3146 HOTSPOT_THREAD_YIELD(); 3147 os::naked_yield(); 3148 JVM_END 3149 3150 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos)) 3151 if (nanos < 0) { 3152 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range"); 3153 } 3154 3155 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3156 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3157 } 3158 3159 // Save current thread state and restore it at the end of this block. 3160 // And set new thread state to SLEEPING. 3161 JavaThreadSleepState jtss(thread); 3162 3163 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC); 3164 3165 if (nanos == 0) { 3166 os::naked_yield(); 3167 } else { 3168 ThreadState old_state = thread->osthread()->get_state(); 3169 thread->osthread()->set_state(SLEEPING); 3170 if (!thread->sleep_nanos(nanos)) { // interrupted 3171 // An asynchronous exception could have been thrown on 3172 // us while we were sleeping. We do not overwrite those. 3173 if (!HAS_PENDING_EXCEPTION) { 3174 HOTSPOT_THREAD_SLEEP_END(1); 3175 3176 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3177 // to properly restore the thread state. That's likely wrong. 3178 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3179 } 3180 } 3181 thread->osthread()->set_state(old_state); 3182 } 3183 HOTSPOT_THREAD_SLEEP_END(0); 3184 JVM_END 3185 3186 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3187 oop jthread = thread->threadObj(); 3188 assert(jthread != nullptr, "no current carrier thread!"); 3189 return JNIHandles::make_local(THREAD, jthread); 3190 JVM_END 3191 3192 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3193 oop theThread = thread->vthread(); 3194 assert(theThread != (oop)nullptr, "no current thread!"); 3195 return JNIHandles::make_local(THREAD, theThread); 3196 JVM_END 3197 3198 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3199 jobject theThread)) 3200 oop threadObj = JNIHandles::resolve(theThread); 3201 thread->set_vthread(threadObj); 3202 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3203 JVM_END 3204 3205 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3206 return ThreadIdentifier::unsafe_offset(); 3207 JVM_END 3208 3209 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3210 ThreadsListHandle tlh(thread); 3211 JavaThread* receiver = nullptr; 3212 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3213 if (is_alive) { 3214 // jthread refers to a live JavaThread. 3215 receiver->interrupt(); 3216 } 3217 JVM_END 3218 3219 // Return true iff the current thread has locked the object passed in 3220 3221 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3222 if (obj == nullptr) { 3223 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3224 } 3225 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3226 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3227 JVM_END 3228 3229 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3230 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD); 3231 return JNIHandles::make_local(THREAD, trace); 3232 JVM_END 3233 3234 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3235 // We don't use a ThreadsListHandle here because the current thread 3236 // must be alive. 3237 oop java_thread = JNIHandles::resolve_non_null(jthread); 3238 JavaThread* thr = java_lang_Thread::thread(java_thread); 3239 if (thread == thr && !thr->has_attached_via_jni()) { 3240 // Thread naming is only supported for the current thread and 3241 // we don't set the name of an attached thread to avoid stepping 3242 // on other programs. 3243 ResourceMark rm(thread); 3244 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3245 os::set_native_thread_name(thread_name); 3246 } 3247 JVM_END 3248 3249 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3250 oop theCache = thread->scopedValueCache(); 3251 return JNIHandles::make_local(THREAD, theCache); 3252 JVM_END 3253 3254 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3255 jobject theCache)) 3256 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3257 thread->set_scopedValueCache(objs); 3258 JVM_END 3259 3260 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3261 3262 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3263 ResourceMark rm(THREAD); 3264 JvmtiVMObjectAllocEventCollector oam; 3265 vframeStream vfst(thread); 3266 3267 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) { 3268 // This must only be called from SecurityManager.getClassContext 3269 Method* m = vfst.method(); 3270 if (!(m->method_holder() == vmClasses::SecurityManager_klass() && 3271 m->name() == vmSymbols::getClassContext_name() && 3272 m->signature() == vmSymbols::void_class_array_signature())) { 3273 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3274 } 3275 } 3276 3277 // Collect method holders 3278 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3279 for (; !vfst.at_end(); vfst.security_next()) { 3280 Method* m = vfst.method(); 3281 // Native frames are not returned 3282 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3283 Klass* holder = m->method_holder(); 3284 assert(holder->is_klass(), "just checking"); 3285 klass_array->append(holder); 3286 } 3287 } 3288 3289 // Create result array of type [Ljava/lang/Class; 3290 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL); 3291 // Fill in mirrors corresponding to method holders 3292 for (int i = 0; i < klass_array->length(); i++) { 3293 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3294 } 3295 3296 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3297 JVM_END 3298 3299 3300 // java.lang.Package //////////////////////////////////////////////////////////////// 3301 3302 3303 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3304 ResourceMark rm(THREAD); 3305 JvmtiVMObjectAllocEventCollector oam; 3306 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3307 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3308 return (jstring) JNIHandles::make_local(THREAD, result); 3309 JVM_END 3310 3311 3312 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3313 JvmtiVMObjectAllocEventCollector oam; 3314 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3315 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3316 JVM_END 3317 3318 3319 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3320 3321 3322 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3323 MonitorLocker ml(Heap_lock); 3324 oop ref = Universe::reference_pending_list(); 3325 if (ref != nullptr) { 3326 Universe::clear_reference_pending_list(); 3327 } 3328 return JNIHandles::make_local(THREAD, ref); 3329 JVM_END 3330 3331 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3332 MonitorLocker ml(Heap_lock); 3333 return Universe::has_reference_pending_list(); 3334 JVM_END 3335 3336 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3337 MonitorLocker ml(Heap_lock); 3338 while (!Universe::has_reference_pending_list()) { 3339 ml.wait(); 3340 } 3341 JVM_END 3342 3343 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3344 oop ref_oop = JNIHandles::resolve_non_null(ref); 3345 // PhantomReference has it's own implementation of refersTo(). 3346 // See: JVM_PhantomReferenceRefersTo 3347 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3348 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3349 return referent == JNIHandles::resolve(o); 3350 JVM_END 3351 3352 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3353 oop ref_oop = JNIHandles::resolve_non_null(ref); 3354 // FinalReference has it's own implementation of clear(). 3355 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3356 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3357 // If the referent has already been cleared then done. 3358 // However, if the referent is dead but has not yet been cleared by 3359 // concurrent reference processing, it should NOT be cleared here. 3360 // Instead, clearing should be left to the GC. Clearing it here could 3361 // detectably lose an expected notification, which is impossible with 3362 // STW reference processing. The clearing in enqueue() doesn't have 3363 // this problem, since the enqueue covers the notification, but it's not 3364 // worth the effort to handle that case specially. 3365 return; 3366 } 3367 java_lang_ref_Reference::clear_referent(ref_oop); 3368 JVM_END 3369 3370 3371 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3372 3373 3374 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3375 oop ref_oop = JNIHandles::resolve_non_null(ref); 3376 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3377 return referent == JNIHandles::resolve(o); 3378 JVM_END 3379 3380 3381 // ObjectInputStream /////////////////////////////////////////////////////////////// 3382 3383 // Return the first user-defined class loader up the execution stack, or null 3384 // if only code from the bootstrap or platform class loader is on the stack. 3385 3386 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3387 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3388 InstanceKlass* ik = vfst.method()->method_holder(); 3389 oop loader = ik->class_loader(); 3390 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3391 // Skip reflection related frames 3392 if (!ik->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) { 3393 return JNIHandles::make_local(THREAD, loader); 3394 } 3395 } 3396 } 3397 return nullptr; 3398 JVM_END 3399 3400 3401 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3402 3403 3404 // resolve array handle and check arguments 3405 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3406 if (arr == nullptr) { 3407 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3408 } 3409 oop a = JNIHandles::resolve_non_null(arr); 3410 if (!a->is_array()) { 3411 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3412 } else if (type_array_only && !a->is_typeArray()) { 3413 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3414 } 3415 return arrayOop(a); 3416 } 3417 3418 3419 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3420 arrayOop a = check_array(env, arr, false, CHECK_0); 3421 return a->length(); 3422 JVM_END 3423 3424 3425 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3426 JvmtiVMObjectAllocEventCollector oam; 3427 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3428 jvalue value; 3429 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3430 oop box = Reflection::box(&value, type, CHECK_NULL); 3431 return JNIHandles::make_local(THREAD, box); 3432 JVM_END 3433 3434 3435 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3436 jvalue value; 3437 value.i = 0; // to initialize value before getting used in CHECK 3438 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3439 assert(a->is_typeArray(), "just checking"); 3440 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3441 BasicType wide_type = (BasicType) wCode; 3442 if (type != wide_type) { 3443 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3444 } 3445 return value; 3446 JVM_END 3447 3448 3449 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3450 arrayOop a = check_array(env, arr, false, CHECK); 3451 oop box = JNIHandles::resolve(val); 3452 jvalue value; 3453 value.i = 0; // to initialize value before getting used in CHECK 3454 BasicType value_type; 3455 if (a->is_objArray()) { 3456 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3457 value_type = Reflection::unbox_for_regular_object(box, &value); 3458 } else { 3459 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3460 } 3461 Reflection::array_set(&value, a, index, value_type, CHECK); 3462 JVM_END 3463 3464 3465 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3466 arrayOop a = check_array(env, arr, true, CHECK); 3467 assert(a->is_typeArray(), "just checking"); 3468 BasicType value_type = (BasicType) vCode; 3469 Reflection::array_set(&v, a, index, value_type, CHECK); 3470 JVM_END 3471 3472 3473 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3474 JvmtiVMObjectAllocEventCollector oam; 3475 oop element_mirror = JNIHandles::resolve(eltClass); 3476 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3477 return JNIHandles::make_local(THREAD, result); 3478 JVM_END 3479 3480 3481 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3482 JvmtiVMObjectAllocEventCollector oam; 3483 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3484 oop element_mirror = JNIHandles::resolve(eltClass); 3485 assert(dim_array->is_typeArray(), "just checking"); 3486 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3487 return JNIHandles::make_local(THREAD, result); 3488 JVM_END 3489 3490 3491 // Library support /////////////////////////////////////////////////////////////////////////// 3492 3493 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3494 return ZipLibrary::handle(); 3495 JVM_END 3496 3497 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3498 //%note jvm_ct 3499 char ebuf[1024]; 3500 void *load_result; 3501 { 3502 ThreadToNativeFromVM ttnfvm(thread); 3503 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3504 } 3505 if (load_result == nullptr) { 3506 if (throwException) { 3507 char msg[1024]; 3508 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3509 // Since 'ebuf' may contain a string encoded using 3510 // platform encoding scheme, we need to pass 3511 // Exceptions::unsafe_to_utf8 to the new_exception method 3512 // as the last argument. See bug 6367357. 3513 Handle h_exception = 3514 Exceptions::new_exception(thread, 3515 vmSymbols::java_lang_UnsatisfiedLinkError(), 3516 msg, Exceptions::unsafe_to_utf8); 3517 3518 THROW_HANDLE_NULL(h_exception); 3519 } else { 3520 log_info(library)("Failed to load library %s", name); 3521 return load_result; 3522 } 3523 } 3524 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3525 return load_result; 3526 JVM_END 3527 3528 3529 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3530 os::dll_unload(handle); 3531 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3532 JVM_END 3533 3534 3535 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3536 void* find_result = os::dll_lookup(handle, name); 3537 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3538 find_result != nullptr ? "Found" : "Failed to find", 3539 name, p2i(handle)); 3540 return find_result; 3541 JVM_END 3542 3543 3544 // JNI version /////////////////////////////////////////////////////////////////////////////// 3545 3546 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3547 return Threads::is_supported_jni_version_including_1_1(version); 3548 JVM_END 3549 3550 3551 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3552 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3553 JVM_END 3554 3555 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void)) 3556 return EnableValhalla ? JNI_TRUE : JNI_FALSE; 3557 JVM_END 3558 3559 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3560 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3561 JVM_END 3562 3563 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void)) 3564 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE; 3565 JVM_END 3566 3567 JVM_ENTRY_NO_ENV(jboolean, JVM_IsStaticallyLinked(void)) 3568 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE; 3569 JVM_END 3570 3571 // String support /////////////////////////////////////////////////////////////////////////// 3572 3573 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3574 JvmtiVMObjectAllocEventCollector oam; 3575 if (str == nullptr) return nullptr; 3576 oop string = JNIHandles::resolve_non_null(str); 3577 oop result = StringTable::intern(string, CHECK_NULL); 3578 return (jstring) JNIHandles::make_local(THREAD, result); 3579 JVM_END 3580 3581 3582 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3583 3584 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3585 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3586 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3587 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3588 // nature. JavaThreads will be "in native" when using this API from JDK code. 3589 3590 3591 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3592 VM_Exit::block_if_vm_exited(); 3593 return new PlatformMutex(); 3594 } 3595 3596 3597 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3598 VM_Exit::block_if_vm_exited(); 3599 delete ((PlatformMutex*) mon); 3600 } 3601 3602 3603 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3604 VM_Exit::block_if_vm_exited(); 3605 ((PlatformMutex*) mon)->lock(); 3606 return 0; 3607 } 3608 3609 3610 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3611 VM_Exit::block_if_vm_exited(); 3612 ((PlatformMutex*) mon)->unlock(); 3613 } 3614 3615 3616 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3617 3618 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3619 Handle loader, Handle protection_domain, 3620 jboolean throwError, TRAPS) { 3621 // Security Note: 3622 // The Java level wrapper will perform the necessary security check allowing 3623 // us to pass the null as the initiating class loader. The VM is responsible for 3624 // the checkPackageAccess relative to the initiating class loader via the 3625 // protection_domain. The protection_domain is passed as null by the java code 3626 // if there is no security manager in 3-arg Class.forName(). 3627 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3628 3629 // Check if we should initialize the class 3630 if (init && klass->is_instance_klass()) { 3631 klass->initialize(CHECK_NULL); 3632 } 3633 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3634 } 3635 3636 3637 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3638 3639 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3640 Handle method_handle; 3641 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3642 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3643 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3644 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL); 3645 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3646 jobject res = JNIHandles::make_local(THREAD, result); 3647 if (JvmtiExport::should_post_vm_object_alloc()) { 3648 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3649 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3650 if (java_lang_Class::is_primitive(ret_type)) { 3651 // Only for primitive type vm allocates memory for java object. 3652 // See box() method. 3653 JvmtiExport::post_vm_object_alloc(thread, result); 3654 } 3655 } 3656 return res; 3657 } else { 3658 THROW_NULL(vmSymbols::java_lang_StackOverflowError()); 3659 } 3660 JVM_END 3661 3662 3663 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3664 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL); 3665 oop constructor_mirror = JNIHandles::resolve(c); 3666 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3667 jobject res = JNIHandles::make_local(THREAD, result); 3668 if (JvmtiExport::should_post_vm_object_alloc()) { 3669 JvmtiExport::post_vm_object_alloc(thread, result); 3670 } 3671 return res; 3672 JVM_END 3673 3674 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3675 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3676 assert(k->is_klass(), "just checking"); 3677 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3678 JVM_END 3679 3680 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3681 jclass caller, 3682 jstring interfaceMethodName, 3683 jobject factoryType, 3684 jobject interfaceMethodType, 3685 jobject implementationMember, 3686 jobject dynamicMethodType, 3687 jclass lambdaProxyClass)) 3688 #if INCLUDE_CDS 3689 if (!CDSConfig::is_dumping_archive()) { 3690 return; 3691 } 3692 3693 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3694 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3695 if (caller_ik->is_hidden()) { 3696 // Hidden classes not of type lambda proxy classes are currently not being archived. 3697 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3698 // registered for archiving. 3699 return; 3700 } 3701 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass)); 3702 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k); 3703 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3704 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3705 3706 Symbol* interface_method_name = nullptr; 3707 if (interfaceMethodName != nullptr) { 3708 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3709 } 3710 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3711 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3712 3713 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3714 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3715 3716 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3717 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3718 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3719 3720 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3721 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3722 3723 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3724 interface_method_type, m, dynamic_method_type, THREAD); 3725 #endif // INCLUDE_CDS 3726 JVM_END 3727 3728 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3729 jclass caller, 3730 jstring interfaceMethodName, 3731 jobject factoryType, 3732 jobject interfaceMethodType, 3733 jobject implementationMember, 3734 jobject dynamicMethodType)) 3735 #if INCLUDE_CDS 3736 3737 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3738 implementationMember == nullptr || dynamicMethodType == nullptr) { 3739 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3740 } 3741 3742 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3743 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3744 if (!caller_ik->is_shared()) { 3745 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3746 return nullptr; 3747 } 3748 3749 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3750 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3751 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3752 3753 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3754 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3755 3756 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3757 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3758 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3759 3760 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3761 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3762 3763 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3764 interface_method_type, m, dynamic_method_type); 3765 jclass jcls = nullptr; 3766 if (lambda_ik != nullptr) { 3767 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD); 3768 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3769 } 3770 return jcls; 3771 #else 3772 return nullptr; 3773 #endif // INCLUDE_CDS 3774 JVM_END 3775 3776 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3777 if (CDSConfig::is_dumping_static_archive()) { 3778 // We do this so that the default CDS archive can be deterministic. 3779 const char* release = VM_Version::vm_release(); 3780 const char* dbg_level = VM_Version::jdk_debug_level(); 3781 const char* version = VM_Version::internal_vm_info_string(); 3782 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3783 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3784 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3785 seed += (jlong)VM_Version::vm_major_version(); 3786 seed += (jlong)VM_Version::vm_minor_version(); 3787 seed += (jlong)VM_Version::vm_security_version(); 3788 seed += (jlong)VM_Version::vm_patch_version(); 3789 if (seed == 0) { // don't let this ever be zero. 3790 seed = 0x87654321; 3791 } 3792 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3793 return seed; 3794 } else { 3795 return 0; 3796 } 3797 JVM_END 3798 3799 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus()) 3800 return CDSConfig::get_status(); 3801 JVM_END 3802 3803 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3804 #if INCLUDE_CDS 3805 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity"); 3806 if (line != nullptr) { 3807 ResourceMark rm(THREAD); 3808 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3809 char* c_line = java_lang_String::as_utf8_string(h_line()); 3810 if (CDSConfig::is_dumping_dynamic_archive()) { 3811 // Note: LambdaFormInvokers::append take same format which is not 3812 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3813 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3814 } 3815 if (ClassListWriter::is_enabled()) { 3816 ClassListWriter w; 3817 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line); 3818 } 3819 } 3820 #endif // INCLUDE_CDS 3821 JVM_END 3822 3823 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3824 #if INCLUDE_CDS 3825 ResourceMark rm(THREAD); 3826 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3827 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3828 MetaspaceShared::dump_loaded_classes(file_name, THREAD); 3829 #endif // INCLUDE_CDS 3830 JVM_END 3831 3832 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3833 #if INCLUDE_CDS 3834 ResourceMark rm(THREAD); 3835 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3836 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3837 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3838 #endif // INCLUDE_CDS 3839 JVM_END 3840 3841 // Returns an array of all live Thread objects (VM internal JavaThreads, 3842 // jvmti agent threads, and JNI attaching threads are skipped) 3843 // See CR 6404306 regarding JNI attaching threads 3844 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3845 ResourceMark rm(THREAD); 3846 ThreadsListEnumerator tle(THREAD, false, false); 3847 JvmtiVMObjectAllocEventCollector oam; 3848 3849 int num_threads = tle.num_threads(); 3850 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3851 objArrayHandle threads_ah(THREAD, r); 3852 3853 for (int i = 0; i < num_threads; i++) { 3854 Handle h = tle.get_threadObj(i); 3855 threads_ah->obj_at_put(i, h()); 3856 } 3857 3858 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3859 JVM_END 3860 3861 3862 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3863 // Return StackTraceElement[][], each element is the stack trace of a thread in 3864 // the corresponding entry in the given threads array 3865 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3866 JvmtiVMObjectAllocEventCollector oam; 3867 3868 // Check if threads is null 3869 if (threads == nullptr) { 3870 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3871 } 3872 3873 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3874 objArrayHandle ah(THREAD, a); 3875 int num_threads = ah->length(); 3876 // check if threads is non-empty array 3877 if (num_threads == 0) { 3878 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3879 } 3880 3881 // check if threads is not an array of objects of Thread class 3882 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3883 if (k != vmClasses::Thread_klass()) { 3884 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3885 } 3886 3887 ResourceMark rm(THREAD); 3888 3889 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3890 for (int i = 0; i < num_threads; i++) { 3891 oop thread_obj = ah->obj_at(i); 3892 instanceHandle h(THREAD, (instanceOop) thread_obj); 3893 thread_handle_array->append(h); 3894 } 3895 3896 // The JavaThread references in thread_handle_array are validated 3897 // in VM_ThreadDump::doit(). 3898 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3899 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3900 3901 JVM_END 3902 3903 // JVM monitoring and management support 3904 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3905 return Management::get_jmm_interface(version); 3906 JVM_END 3907 3908 // com.sun.tools.attach.VirtualMachine agent properties support 3909 // 3910 // Initialize the agent properties with the properties maintained in the VM 3911 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3912 ResourceMark rm; 3913 3914 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3915 3916 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3917 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3918 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3919 return properties; 3920 JVM_END 3921 3922 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3923 { 3924 JvmtiVMObjectAllocEventCollector oam; 3925 3926 if (ofClass == nullptr) { 3927 return nullptr; 3928 } 3929 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3930 // Special handling for primitive objects 3931 if (java_lang_Class::is_primitive(mirror())) { 3932 return nullptr; 3933 } 3934 Klass* k = java_lang_Class::as_Klass(mirror()); 3935 if (!k->is_instance_klass()) { 3936 return nullptr; 3937 } 3938 InstanceKlass* ik = InstanceKlass::cast(k); 3939 int encl_method_class_idx = ik->enclosing_method_class_index(); 3940 if (encl_method_class_idx == 0) { 3941 return nullptr; 3942 } 3943 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3944 objArrayHandle dest(THREAD, dest_o); 3945 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3946 dest->obj_at_put(0, enc_k->java_mirror()); 3947 int encl_method_method_idx = ik->enclosing_method_method_index(); 3948 if (encl_method_method_idx != 0) { 3949 Symbol* sym = ik->constants()->symbol_at( 3950 extract_low_short_from_int( 3951 ik->constants()->name_and_type_at(encl_method_method_idx))); 3952 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3953 dest->obj_at_put(1, str()); 3954 sym = ik->constants()->symbol_at( 3955 extract_high_short_from_int( 3956 ik->constants()->name_and_type_at(encl_method_method_idx))); 3957 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3958 dest->obj_at_put(2, str()); 3959 } 3960 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3961 } 3962 JVM_END 3963 3964 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3965 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3966 ResourceMark rm(THREAD); 3967 3968 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3969 return nullptr; 3970 } 3971 3972 char** vm_flags = Arguments::jvm_flags_array(); 3973 char** vm_args = Arguments::jvm_args_array(); 3974 int num_flags = Arguments::num_jvm_flags(); 3975 int num_args = Arguments::num_jvm_args(); 3976 3977 InstanceKlass* ik = vmClasses::String_klass(); 3978 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3979 objArrayHandle result_h(THREAD, r); 3980 3981 int index = 0; 3982 for (int j = 0; j < num_flags; j++, index++) { 3983 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3984 result_h->obj_at_put(index, h()); 3985 } 3986 for (int i = 0; i < num_args; i++, index++) { 3987 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3988 result_h->obj_at_put(index, h()); 3989 } 3990 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 3991 JVM_END 3992 3993 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 3994 return os::get_signal_number(name); 3995 JVM_END 3996 3997 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread)) 3998 #if INCLUDE_JVMTI 3999 if (!DoJVMTIVirtualThreadTransitions) { 4000 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4001 return; 4002 } 4003 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4004 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread); 4005 } else { 4006 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4007 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false); 4008 } 4009 #endif 4010 JVM_END 4011 4012 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread)) 4013 #if INCLUDE_JVMTI 4014 if (!DoJVMTIVirtualThreadTransitions) { 4015 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4016 return; 4017 } 4018 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4019 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread); 4020 } else { 4021 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4022 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true); 4023 } 4024 #endif 4025 JVM_END 4026 4027 // If notifications are disabled then just update the VTMS transition bit and return. 4028 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call. 4029 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide)) 4030 #if INCLUDE_JVMTI 4031 if (!DoJVMTIVirtualThreadTransitions) { 4032 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4033 return; 4034 } 4035 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4036 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide); 4037 } else { 4038 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4039 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 4040 } 4041 #endif 4042 JVM_END 4043 4044 // If notifications are disabled then just update the VTMS transition bit and return. 4045 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below. 4046 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide)) 4047 #if INCLUDE_JVMTI 4048 if (!DoJVMTIVirtualThreadTransitions) { 4049 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4050 return; 4051 } 4052 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4053 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide); 4054 } else { 4055 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4056 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 4057 } 4058 #endif 4059 JVM_END 4060 4061 // Always update the temporary VTMS transition bit. 4062 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jclass clazz, jboolean hide)) 4063 #if INCLUDE_JVMTI 4064 if (!DoJVMTIVirtualThreadTransitions) { 4065 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4066 return; 4067 } 4068 assert(!thread->is_in_VTMS_transition(), "sanity check"); 4069 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check"); 4070 thread->toggle_is_in_tmp_VTMS_transition(); 4071 #endif 4072 JVM_END 4073 4074 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section. 4075 // Needed to avoid deadlocks with JVMTI suspend mechanism. 4076 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter)) 4077 #if INCLUDE_JVMTI 4078 if (!DoJVMTIVirtualThreadTransitions) { 4079 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4080 return; 4081 } 4082 assert(thread->is_disable_suspend() != (bool)enter, 4083 "nested or unbalanced monitor enter/exit is not allowed"); 4084 thread->toggle_is_disable_suspend(); 4085 #endif 4086 JVM_END 4087 4088 /* 4089 * Return the current class's class file version. The low order 16 bits of the 4090 * returned jint contain the class's major version. The high order 16 bits 4091 * contain the class's minor version. 4092 */ 4093 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 4094 oop mirror = JNIHandles::resolve_non_null(current); 4095 if (java_lang_Class::is_primitive(mirror)) { 4096 // return latest major version and minor version of 0. 4097 return JVM_CLASSFILE_MAJOR_VERSION; 4098 } 4099 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class"); 4100 4101 Klass* c = java_lang_Class::as_Klass(mirror); 4102 assert(c->is_instance_klass(), "must be"); 4103 InstanceKlass* ik = InstanceKlass::cast(c); 4104 return (ik->minor_version() << 16) | ik->major_version(); 4105 JVM_END 4106 4107 /* 4108 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 4109 * get the value will see a materialized value and not a scalar-replaced 4110 * null value. 4111 */ 4112 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 4113 JVM_EnsureMaterializedForStackWalk(env, value); 4114 JVM_END 4115 4116 /* 4117 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded. 4118 */ 4119 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void)) 4120 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE; 4121 JVM_END