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 117 118 #include <errno.h> 119 120 /* 121 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 122 such ctors and calls MUST NOT come between an oop declaration/init and its 123 usage because if objects are move this may cause various memory stomps, bus 124 errors and segfaults. Here is a cookbook for causing so called "naked oop 125 failures": 126 127 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 128 // Object address to be held directly in mirror & not visible to GC 129 oop mirror = JNIHandles::resolve_non_null(ofClass); 130 131 // If this ctor can hit a safepoint, moving objects around, then 132 ComplexConstructor foo; 133 134 // Boom! mirror may point to JUNK instead of the intended object 135 (some dereference of mirror) 136 137 // Here's another call that may block for GC, making mirror stale 138 MutexLocker ml(some_lock); 139 140 // And here's an initializer that can result in a stale oop 141 // all in one step. 142 oop o = call_that_can_throw_exception(TRAPS); 143 144 145 The solution is to keep the oop declaration BELOW the ctor or function 146 call that might cause a GC, do another resolve to reassign the oop, or 147 consider use of a Handle instead of an oop so there is immunity from object 148 motion. But note that the "QUICK" entries below do not have a handlemark 149 and thus can only support use of handles passed in. 150 */ 151 152 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 153 ResourceMark rm; 154 int line_number = -1; 155 const char * source_file = nullptr; 156 const char * trace = "explicit"; 157 InstanceKlass* caller = nullptr; 158 JavaThread* jthread = THREAD; 159 if (jthread->has_last_Java_frame()) { 160 vframeStream vfst(jthread); 161 162 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 163 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController"); 164 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 165 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction"); 166 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 167 168 Method* last_caller = nullptr; 169 170 while (!vfst.at_end()) { 171 Method* m = vfst.method(); 172 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&& 173 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 174 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 175 break; 176 } 177 last_caller = m; 178 vfst.next(); 179 } 180 // if this is called from Class.forName0 and that is called from Class.forName, 181 // then print the caller of Class.forName. If this is Class.loadClass, then print 182 // that caller, otherwise keep quiet since this should be picked up elsewhere. 183 bool found_it = false; 184 if (!vfst.at_end() && 185 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 186 vfst.method()->name() == vmSymbols::forName0_name()) { 187 vfst.next(); 188 if (!vfst.at_end() && 189 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 190 vfst.method()->name() == vmSymbols::forName_name()) { 191 vfst.next(); 192 found_it = true; 193 } 194 } else if (last_caller != nullptr && 195 last_caller->method_holder()->name() == 196 vmSymbols::java_lang_ClassLoader() && 197 last_caller->name() == vmSymbols::loadClass_name()) { 198 found_it = true; 199 } else if (!vfst.at_end()) { 200 if (vfst.method()->is_native()) { 201 // JNI call 202 found_it = true; 203 } 204 } 205 if (found_it && !vfst.at_end()) { 206 // found the caller 207 caller = vfst.method()->method_holder(); 208 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 209 if (line_number == -1) { 210 // show method name if it's a native method 211 trace = vfst.method()->name_and_sig_as_C_string(); 212 } 213 Symbol* s = caller->source_file_name(); 214 if (s != nullptr) { 215 source_file = s->as_C_string(); 216 } 217 } 218 } 219 if (caller != nullptr) { 220 if (to_class != caller) { 221 const char * from = caller->external_name(); 222 const char * to = to_class->external_name(); 223 // print in a single call to reduce interleaving between threads 224 if (source_file != nullptr) { 225 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 226 } else { 227 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 228 } 229 } 230 } 231 } 232 233 void trace_class_resolution(Klass* to_class) { 234 EXCEPTION_MARK; 235 trace_class_resolution_impl(to_class, THREAD); 236 if (HAS_PENDING_EXCEPTION) { 237 CLEAR_PENDING_EXCEPTION; 238 } 239 } 240 241 // java.lang.System ////////////////////////////////////////////////////////////////////// 242 243 244 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 245 return os::javaTimeMillis(); 246 JVM_END 247 248 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 249 return os::javaTimeNanos(); 250 JVM_END 251 252 // The function below is actually exposed by jdk.internal.misc.VM and not 253 // java.lang.System, but we choose to keep it here so that it stays next 254 // to JVM_CurrentTimeMillis and JVM_NanoTime 255 256 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 257 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 258 259 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 260 jlong seconds; 261 jlong nanos; 262 263 os::javaTimeSystemUTC(seconds, nanos); 264 265 // We're going to verify that the result can fit in a long. 266 // For that we need the difference in seconds between 'seconds' 267 // and 'offset_secs' to be such that: 268 // |seconds - offset_secs| < (2^63/10^9) 269 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 270 // which makes |seconds - offset_secs| < 2^33 271 // and we will prefer +/- 2^32 as the maximum acceptable diff 272 // as 2^32 has a more natural feel than 2^33... 273 // 274 // So if |seconds - offset_secs| >= 2^32 - we return a special 275 // sentinel value (-1) which the caller should take as an 276 // exception value indicating that the offset given to us is 277 // too far from range of the current time - leading to too big 278 // a nano adjustment. The caller is expected to recover by 279 // computing a more accurate offset and calling this method 280 // again. (For the record 2^32 secs is ~136 years, so that 281 // should rarely happen) 282 // 283 jlong diff = seconds - offset_secs; 284 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 285 return -1; // sentinel value: the offset is too far off the target 286 } 287 288 // return the adjustment. If you compute a time by adding 289 // this number of nanoseconds along with the number of seconds 290 // in the offset you should get the current UTC time. 291 return (diff * (jlong)1000000000) + nanos; 292 JVM_END 293 294 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 295 jobject dst, jint dst_pos, jint length)) 296 // Check if we have null pointers 297 if (src == nullptr || dst == nullptr) { 298 THROW(vmSymbols::java_lang_NullPointerException()); 299 } 300 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 301 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 302 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 303 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 304 // Do copy 305 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 306 JVM_END 307 308 309 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 310 JavaValue r(T_OBJECT); 311 // public synchronized Object put(Object key, Object value); 312 HandleMark hm(THREAD); 313 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 314 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK); 315 JavaCalls::call_virtual(&r, 316 props, 317 vmClasses::Properties_klass(), 318 vmSymbols::put_name(), 319 vmSymbols::object_object_object_signature(), 320 key_str, 321 value_str, 322 THREAD); 323 } 324 325 326 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 327 328 /* 329 * Return all of the system properties in a Java String array with alternating 330 * names and values from the jvm SystemProperty. 331 * Which includes some internal and all commandline -D defined properties. 332 */ 333 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 334 ResourceMark rm(THREAD); 335 HandleMark hm(THREAD); 336 int ndx = 0; 337 int fixedCount = 2; 338 339 SystemProperty* p = Arguments::system_properties(); 340 int count = Arguments::PropertyList_count(p); 341 342 // Allocate result String array 343 InstanceKlass* ik = vmClasses::String_klass(); 344 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 345 objArrayHandle result_h(THREAD, r); 346 347 while (p != nullptr) { 348 const char * key = p->key(); 349 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 350 const char * value = p->value(); 351 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 352 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL); 353 result_h->obj_at_put(ndx * 2, key_str()); 354 result_h->obj_at_put(ndx * 2 + 1, value_str()); 355 ndx++; 356 } 357 p = p->next(); 358 } 359 360 // Convert the -XX:MaxDirectMemorySize= command line flag 361 // to the sun.nio.MaxDirectMemorySize property. 362 // Do this after setting user properties to prevent people 363 // from setting the value with a -D option, as requested. 364 // Leave empty if not supplied 365 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 366 char as_chars[256]; 367 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 368 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 369 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 370 result_h->obj_at_put(ndx * 2, key_str()); 371 result_h->obj_at_put(ndx * 2 + 1, value_str()); 372 ndx++; 373 } 374 375 // JVM monitoring and management support 376 // Add the sun.management.compiler property for the compiler's name 377 { 378 #undef CSIZE 379 #if defined(_LP64) || defined(_WIN64) 380 #define CSIZE "64-Bit " 381 #else 382 #define CSIZE 383 #endif // 64bit 384 385 #if COMPILER1_AND_COMPILER2 386 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 387 #else 388 #if defined(COMPILER1) 389 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 390 #elif defined(COMPILER2) 391 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 392 #elif INCLUDE_JVMCI 393 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2" 394 #else 395 const char* compiler_name = ""; 396 #endif // compilers 397 #endif // COMPILER1_AND_COMPILER2 398 399 if (*compiler_name != '\0' && 400 (Arguments::mode() != Arguments::_int)) { 401 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 402 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 403 result_h->obj_at_put(ndx * 2, key_str()); 404 result_h->obj_at_put(ndx * 2 + 1, value_str()); 405 ndx++; 406 } 407 } 408 409 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 410 JVM_END 411 412 413 /* 414 * Return the temporary directory that the VM uses for the attach 415 * and perf data files. 416 * 417 * It is important that this directory is well-known and the 418 * same for all VM instances. It cannot be affected by configuration 419 * variables such as java.io.tmpdir. 420 */ 421 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 422 HandleMark hm(THREAD); 423 const char* temp_dir = os::get_temp_directory(); 424 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 425 return (jstring) JNIHandles::make_local(THREAD, h()); 426 JVM_END 427 428 JVM_ENTRY(jarray, JVM_NewNullRestrictedArray(JNIEnv *env, jclass elmClass, jint len)) 429 if (len < 0) { 430 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative"); 431 } 432 oop mirror = JNIHandles::resolve_non_null(elmClass); 433 Klass* klass = java_lang_Class::as_Klass(mirror); 434 klass->initialize(CHECK_NULL); 435 if (klass->is_identity_class()) { 436 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class"); 437 } 438 InstanceKlass* ik = InstanceKlass::cast(klass); 439 if (!ik->is_implicitly_constructible()) { 440 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not implicitly constructible"); 441 } 442 oop array = oopFactory::new_valueArray(ik, len, CHECK_NULL); 443 return (jarray) JNIHandles::make_local(THREAD, array); 444 JVM_END 445 446 447 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj)) 448 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj)); 449 return oop->is_null_free_array(); 450 JVM_END 451 452 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 453 454 extern volatile jint vm_created; 455 456 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 457 EventShutdown event; 458 if (event.should_commit()) { 459 event.set_reason("Shutdown requested from Java"); 460 event.commit(); 461 } 462 JVM_END 463 464 465 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 466 before_exit(thread, true); 467 vm_exit(code); 468 JVM_END 469 470 471 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 472 if (!DisableExplicitGC) { 473 EventSystemGC event; 474 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent); 475 Universe::heap()->collect(GCCause::_java_lang_system_gc); 476 event.commit(); 477 } 478 JVM_END 479 480 481 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 482 return Universe::heap()->millis_since_last_whole_heap_examined(); 483 JVM_END 484 485 486 static inline jlong convert_size_t_to_jlong(size_t val) { 487 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 488 NOT_LP64 (return (jlong)val;) 489 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 490 } 491 492 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 493 size_t n = Universe::heap()->capacity(); 494 return convert_size_t_to_jlong(n); 495 JVM_END 496 497 498 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 499 size_t n = Universe::heap()->unused(); 500 return convert_size_t_to_jlong(n); 501 JVM_END 502 503 504 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 505 size_t n = Universe::heap()->max_capacity(); 506 return convert_size_t_to_jlong(n); 507 JVM_END 508 509 510 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 511 return os::active_processor_count(); 512 JVM_END 513 514 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void)) 515 #ifdef LINUX 516 if (UseContainerSupport) { 517 return JNI_TRUE; 518 } 519 #endif 520 return JNI_FALSE; 521 JVM_END 522 523 // java.lang.Throwable ////////////////////////////////////////////////////// 524 525 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 526 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 527 java_lang_Throwable::fill_in_stack_trace(exception); 528 JVM_END 529 530 // java.lang.NullPointerException /////////////////////////////////////////// 531 532 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 533 if (!ShowCodeDetailsInExceptionMessages) return nullptr; 534 535 oop exc = JNIHandles::resolve_non_null(throwable); 536 537 Method* method; 538 int bci; 539 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 540 return nullptr; 541 } 542 if (method->is_native()) { 543 return nullptr; 544 } 545 546 stringStream ss; 547 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 548 if (ok) { 549 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 550 return (jstring) JNIHandles::make_local(THREAD, result); 551 } else { 552 return nullptr; 553 } 554 JVM_END 555 556 // java.lang.StackTraceElement ////////////////////////////////////////////// 557 558 559 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth)) 560 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace)); 561 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 562 objArrayHandle stack_trace(THREAD, st); 563 // Fill in the allocated stack trace 564 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK); 565 JVM_END 566 567 568 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 569 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 570 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 571 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK); 572 JVM_END 573 574 575 // java.lang.StackWalker ////////////////////////////////////////////////////// 576 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj)) 577 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj)); 578 579 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr); 580 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr); 581 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info()); 582 if (!have_name) { 583 oop name = StringTable::intern(method->name(), CHECK); 584 java_lang_StackFrameInfo::set_name(stack_frame_info(), name); 585 } 586 if (!have_type) { 587 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK); 588 java_lang_StackFrameInfo::set_type(stack_frame_info(), type()); 589 } 590 JVM_END 591 592 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode, 593 jint skip_frames, jobject contScope, jobject cont, 594 jint buffer_size, jint start_index, jobjectArray frames)) 595 if (!thread->has_last_Java_frame()) { 596 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr); 597 } 598 599 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 600 Handle contScope_h(THREAD, JNIHandles::resolve(contScope)); 601 Handle cont_h(THREAD, JNIHandles::resolve(cont)); 602 // frames array is a ClassFrameInfo[] array when only getting caller reference, 603 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 604 // be null. 605 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 606 objArrayHandle frames_array_h(THREAD, fa); 607 608 if (frames_array_h->length() < buffer_size) { 609 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr); 610 } 611 612 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h, 613 buffer_size, start_index, frames_array_h, CHECK_NULL); 614 return JNIHandles::make_local(THREAD, result); 615 JVM_END 616 617 618 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor, 619 jint last_batch_count, jint buffer_size, jint start_index, 620 jobjectArray frames)) 621 // frames array is a ClassFrameInfo[] array when only getting caller reference, 622 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 623 // be null. 624 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 625 objArrayHandle frames_array_h(THREAD, fa); 626 627 if (frames_array_h->length() < buffer_size) { 628 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 629 } 630 631 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 632 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size, 633 start_index, frames_array_h, THREAD); 634 JVM_END 635 636 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont)) 637 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 638 objArrayHandle frames_array_h(THREAD, fa); 639 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 640 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont)); 641 642 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD); 643 JVM_END 644 645 // java.lang.Object /////////////////////////////////////////////// 646 647 648 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 649 // as implemented in the classic virtual machine; return 0 if object is null 650 if (handle == nullptr) { 651 return 0; 652 } 653 oop obj = JNIHandles::resolve_non_null(handle); 654 if (EnableValhalla && obj->klass()->is_inline_klass()) { 655 JavaValue result(T_INT); 656 JavaCallArguments args; 657 Handle ho(THREAD, obj); 658 args.push_oop(ho); 659 methodHandle method(THREAD, Universe::value_object_hash_code_method()); 660 JavaCalls::call(&result, method, &args, THREAD); 661 if (HAS_PENDING_EXCEPTION) { 662 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) { 663 Handle e(THREAD, PENDING_EXCEPTION); 664 CLEAR_PENDING_EXCEPTION; 665 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false); 666 } 667 } 668 return result.get_jint(); 669 } else { 670 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj)); 671 } 672 JVM_END 673 674 675 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 676 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 677 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 678 if (JvmtiExport::should_post_monitor_wait()) { 679 JvmtiExport::post_monitor_wait(thread, obj(), ms); 680 681 // The current thread already owns the monitor and it has not yet 682 // been added to the wait queue so the current thread cannot be 683 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 684 // event handler cannot accidentally consume an unpark() meant for 685 // the ParkEvent associated with this ObjectMonitor. 686 } 687 ObjectSynchronizer::wait(obj, ms, CHECK); 688 JVM_END 689 690 691 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 692 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 693 ObjectSynchronizer::notify(obj, CHECK); 694 JVM_END 695 696 697 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 698 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 699 ObjectSynchronizer::notifyall(obj, CHECK); 700 JVM_END 701 702 703 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 704 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 705 Klass* klass = obj->klass(); 706 JvmtiVMObjectAllocEventCollector oam; 707 708 #ifdef ASSERT 709 // Just checking that the cloneable flag is set correct 710 if (obj->is_array()) { 711 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 712 } else { 713 guarantee(obj->is_instance(), "should be instanceOop"); 714 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 715 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 716 } 717 #endif 718 719 // Check if class of obj supports the Cloneable interface. 720 // All arrays are considered to be cloneable (See JLS 20.1.5). 721 // All j.l.r.Reference classes are considered non-cloneable. 722 if (!klass->is_cloneable() || 723 (klass->is_instance_klass() && 724 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 725 ResourceMark rm(THREAD); 726 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 727 } 728 729 if (klass->is_inline_klass()) { 730 // Value instances have no identity, so return the current instance instead of allocating a new one 731 // Value classes cannot have finalizers, so the method can return immediately 732 return JNIHandles::make_local(THREAD, obj()); 733 } 734 735 // Make shallow object copy 736 const size_t size = obj->size(); 737 oop new_obj_oop = nullptr; 738 if (obj->is_array()) { 739 const int length = ((arrayOop)obj())->length(); 740 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 741 /* do_zero */ true, CHECK_NULL); 742 } else { 743 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 744 } 745 746 HeapAccess<>::clone(obj(), new_obj_oop, size); 747 748 Handle new_obj(THREAD, new_obj_oop); 749 // Caution: this involves a java upcall, so the clone should be 750 // "gc-robust" by this stage. 751 if (klass->has_finalizer()) { 752 assert(obj->is_instance(), "should be instanceOop"); 753 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 754 new_obj = Handle(THREAD, new_obj_oop); 755 } 756 757 return JNIHandles::make_local(THREAD, new_obj()); 758 JVM_END 759 760 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 761 762 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 763 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 764 JVM_END 765 766 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 767 return InstanceKlass::is_finalization_enabled(); 768 JVM_END 769 770 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 771 772 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 773 CONT_RegisterNativeMethods(env, cls); 774 JVM_END 775 776 // java.io.File /////////////////////////////////////////////////////////////// 777 778 JVM_LEAF(char*, JVM_NativePath(char* path)) 779 return os::native_path(path); 780 JVM_END 781 782 783 // Misc. class handling /////////////////////////////////////////////////////////// 784 785 786 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 787 // Getting the class of the caller frame. 788 // 789 // The call stack at this point looks something like this: 790 // 791 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ] 792 // [1] [ @CallerSensitive API.method ] 793 // [.] [ (skipped intermediate frames) ] 794 // [n] [ caller ] 795 vframeStream vfst(thread); 796 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 797 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 798 Method* m = vfst.method(); 799 assert(m != nullptr, "sanity"); 800 switch (n) { 801 case 0: 802 // This must only be called from Reflection.getCallerClass 803 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 804 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 805 } 806 // fall-through 807 case 1: 808 // Frame 0 and 1 must be caller sensitive. 809 if (!m->caller_sensitive()) { 810 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 811 } 812 break; 813 default: 814 if (!m->is_ignored_by_security_stack_walk()) { 815 // We have reached the desired frame; return the holder class. 816 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 817 } 818 break; 819 } 820 } 821 return nullptr; 822 JVM_END 823 824 825 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 826 oop mirror = nullptr; 827 BasicType t = name2type(utf); 828 if (t != T_ILLEGAL && !is_reference_type(t)) { 829 mirror = Universe::java_mirror(t); 830 } 831 if (mirror == nullptr) { 832 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 833 } else { 834 return (jclass) JNIHandles::make_local(THREAD, mirror); 835 } 836 JVM_END 837 838 839 // Returns a class loaded by the bootstrap class loader; or null 840 // if not found. ClassNotFoundException is not thrown. 841 // FindClassFromBootLoader is exported to the launcher for windows. 842 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 843 const char* name)) 844 // Java libraries should ensure that name is never null or illegal. 845 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 846 // It's impossible to create this class; the name cannot fit 847 // into the constant pool. 848 return nullptr; 849 } 850 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name"); 851 852 TempNewSymbol h_name = SymbolTable::new_symbol(name); 853 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 854 if (k == nullptr) { 855 return nullptr; 856 } 857 858 if (log_is_enabled(Debug, class, resolve)) { 859 trace_class_resolution(k); 860 } 861 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 862 JVM_END 863 864 // Find a class with this name in this loader, using the caller's protection domain. 865 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 866 jboolean init, jobject loader, 867 jclass caller)) 868 TempNewSymbol h_name = 869 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 870 CHECK_NULL); 871 872 oop loader_oop = JNIHandles::resolve(loader); 873 oop from_class = JNIHandles::resolve(caller); 874 oop protection_domain = nullptr; 875 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 876 // NPE. Put it in another way, the bootstrap class loader has all permission and 877 // thus no checkPackageAccess equivalence in the VM class loader. 878 // The caller is also passed as null by the java code if there is no security 879 // manager to avoid the performance cost of getting the calling class. 880 if (from_class != nullptr && loader_oop != nullptr) { 881 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 882 } 883 884 Handle h_loader(THREAD, loader_oop); 885 Handle h_prot(THREAD, protection_domain); 886 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 887 h_prot, false, THREAD); 888 889 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 890 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 891 } 892 return result; 893 JVM_END 894 895 // Currently only called from the old verifier. 896 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 897 jboolean init, jclass from)) 898 TempNewSymbol h_name = 899 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 900 CHECK_NULL); 901 oop from_class_oop = JNIHandles::resolve(from); 902 Klass* from_class = (from_class_oop == nullptr) 903 ? (Klass*)nullptr 904 : java_lang_Class::as_Klass(from_class_oop); 905 oop class_loader = nullptr; 906 oop protection_domain = nullptr; 907 if (from_class != nullptr) { 908 class_loader = from_class->class_loader(); 909 protection_domain = from_class->protection_domain(); 910 } 911 Handle h_loader(THREAD, class_loader); 912 Handle h_prot (THREAD, protection_domain); 913 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 914 h_prot, true, thread); 915 916 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 917 // this function is generally only used for class loading during verification. 918 ResourceMark rm; 919 oop from_mirror = JNIHandles::resolve_non_null(from); 920 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 921 const char * from_name = from_class->external_name(); 922 923 oop mirror = JNIHandles::resolve_non_null(result); 924 Klass* to_class = java_lang_Class::as_Klass(mirror); 925 const char * to = to_class->external_name(); 926 log_debug(class, resolve)("%s %s (verification)", from_name, to); 927 } 928 929 return result; 930 JVM_END 931 932 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 933 static jclass jvm_define_class_common(const char *name, 934 jobject loader, const jbyte *buf, 935 jsize len, jobject pd, const char *source, 936 TRAPS) { 937 if (source == nullptr) source = "__JVM_DefineClass__"; 938 939 JavaThread* jt = THREAD; 940 941 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 942 ClassLoader::perf_define_appclass_selftime(), 943 ClassLoader::perf_define_appclasses(), 944 jt->get_thread_stat()->perf_recursion_counts_addr(), 945 jt->get_thread_stat()->perf_timers_addr(), 946 PerfClassTraceTime::DEFINE_CLASS); 947 948 if (UsePerfData) { 949 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 950 } 951 952 // Class resolution will get the class name from the .class stream if the name is null. 953 TempNewSymbol class_name = name == nullptr ? nullptr : 954 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 955 CHECK_NULL); 956 957 ResourceMark rm(THREAD); 958 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 959 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 960 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 961 ClassLoadInfo cl_info(protection_domain); 962 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 963 class_loader, 964 cl_info, 965 CHECK_NULL); 966 967 if (log_is_enabled(Debug, class, resolve)) { 968 trace_class_resolution(k); 969 } 970 971 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 972 } 973 974 enum { 975 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 976 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 977 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 978 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 979 }; 980 981 /* 982 * Define a class with the specified flags that indicates if it's a nestmate, 983 * hidden, or strongly referenced from class loader. 984 */ 985 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 986 const jbyte *buf, jsize len, jobject pd, 987 jboolean init, int flags, jobject classData, TRAPS) { 988 ResourceMark rm(THREAD); 989 990 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup)); 991 // Lookup class must be a non-null instance 992 if (lookup_k == nullptr) { 993 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 994 } 995 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass"); 996 997 Handle class_loader (THREAD, lookup_k->class_loader()); 998 999 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 1000 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1001 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1002 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1003 1004 InstanceKlass* host_class = nullptr; 1005 if (is_nestmate) { 1006 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL); 1007 } 1008 1009 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1010 name, 1011 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1012 is_nestmate ? host_class->external_name() : "", 1013 is_hidden ? "hidden" : "not hidden", 1014 is_strong ? "strong" : "weak", 1015 vm_annotations ? "with vm annotations" : "without vm annotation"); 1016 1017 if (!is_hidden) { 1018 // classData is only applicable for hidden classes 1019 if (classData != nullptr) { 1020 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1021 } 1022 if (is_nestmate) { 1023 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1024 } 1025 if (!is_strong) { 1026 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1027 } 1028 if (vm_annotations) { 1029 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1030 } 1031 if (flags != STRONG_LOADER_LINK) { 1032 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1033 err_msg("invalid flag 0x%x", flags)); 1034 } 1035 } 1036 1037 // Class resolution will get the class name from the .class stream if the name is null. 1038 TempNewSymbol class_name = name == nullptr ? nullptr : 1039 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1040 CHECK_NULL); 1041 1042 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1043 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1044 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 1045 1046 InstanceKlass* ik = nullptr; 1047 if (!is_hidden) { 1048 ClassLoadInfo cl_info(protection_domain); 1049 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1050 class_loader, 1051 cl_info, 1052 CHECK_NULL); 1053 1054 if (log_is_enabled(Debug, class, resolve)) { 1055 trace_class_resolution(ik); 1056 } 1057 } else { // hidden 1058 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1059 ClassLoadInfo cl_info(protection_domain, 1060 host_class, 1061 classData_h, 1062 is_hidden, 1063 is_strong, 1064 vm_annotations); 1065 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1066 class_loader, 1067 cl_info, 1068 CHECK_NULL); 1069 1070 // The hidden class loader data has been artificially been kept alive to 1071 // this point. The mirror and any instances of this class have to keep 1072 // it alive afterwards. 1073 ik->class_loader_data()->dec_keep_alive(); 1074 1075 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1076 ModuleEntry* module = ik->module(); 1077 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1078 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1079 module_name, 1080 ik->external_name(), 1081 host_class->external_name(), 1082 ik->is_hidden() ? "is hidden" : "is not hidden"); 1083 } 1084 } 1085 1086 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) { 1087 // non-hidden class or nestmate class must be in the same package as the Lookup class 1088 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages"); 1089 } 1090 1091 if (init) { 1092 ik->initialize(CHECK_NULL); 1093 } else { 1094 ik->link_class(CHECK_NULL); 1095 } 1096 1097 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1098 } 1099 1100 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1101 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1102 JVM_END 1103 1104 /* 1105 * Define a class with the specified lookup class. 1106 * lookup: Lookup class 1107 * name: the name of the class 1108 * buf: class bytes 1109 * len: length of class bytes 1110 * pd: protection domain 1111 * init: initialize the class 1112 * flags: properties of the class 1113 * classData: private static pre-initialized field 1114 */ 1115 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1116 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1117 1118 if (lookup == nullptr) { 1119 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1120 } 1121 1122 assert(buf != nullptr, "buf must not be null"); 1123 1124 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1125 JVM_END 1126 1127 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1128 1129 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1130 JVM_END 1131 1132 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1133 ResourceMark rm(THREAD); 1134 1135 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1136 char* str = java_lang_String::as_utf8_string(h_name()); 1137 1138 // Sanity check, don't expect null 1139 if (str == nullptr) return nullptr; 1140 1141 // Internalize the string, converting '.' to '/' in string. 1142 char* p = (char*)str; 1143 while (*p != '\0') { 1144 if (*p == '.') { 1145 *p = '/'; 1146 } 1147 p++; 1148 } 1149 1150 const int str_len = (int)(p - str); 1151 if (str_len > Symbol::max_length()) { 1152 // It's impossible to create this class; the name cannot fit 1153 // into the constant pool. 1154 return nullptr; 1155 } 1156 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1157 1158 // Security Note: 1159 // The Java level wrapper will perform the necessary security check allowing 1160 // us to pass the null as the initiating class loader. 1161 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1162 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, 1163 h_loader, 1164 Handle()); 1165 #if INCLUDE_CDS 1166 if (k == nullptr) { 1167 // If the class is not already loaded, try to see if it's in the shared 1168 // archive for the current classloader (h_loader). 1169 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1170 } 1171 #endif 1172 return (k == nullptr) ? nullptr : 1173 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1174 JVM_END 1175 1176 // Module support ////////////////////////////////////////////////////////////////////////////// 1177 1178 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1179 jstring location, jobjectArray packages)) 1180 Handle h_module (THREAD, JNIHandles::resolve(module)); 1181 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1182 JVM_END 1183 1184 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1185 Handle h_module (THREAD, JNIHandles::resolve(module)); 1186 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1187 JVM_END 1188 1189 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1190 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1191 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1192 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1193 JVM_END 1194 1195 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1196 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1197 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1198 JVM_END 1199 1200 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1201 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1202 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1203 JVM_END 1204 1205 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1206 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1207 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1208 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1209 JVM_END 1210 1211 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1212 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1213 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1214 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1215 JVM_END 1216 1217 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1218 1219 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1220 assert (cls != nullptr, "illegal class"); 1221 JvmtiVMObjectAllocEventCollector oam; 1222 ResourceMark rm(THREAD); 1223 HandleMark hm(THREAD); 1224 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1225 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1226 return (jstring) JNIHandles::make_local(THREAD, result); 1227 JVM_END 1228 1229 1230 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1231 JvmtiVMObjectAllocEventCollector oam; 1232 oop mirror = JNIHandles::resolve_non_null(cls); 1233 1234 // Special handling for primitive objects 1235 if (java_lang_Class::is_primitive(mirror)) { 1236 // Primitive objects does not have any interfaces 1237 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1238 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1239 } 1240 1241 Klass* klass = java_lang_Class::as_Klass(mirror); 1242 // Figure size of result array 1243 int size; 1244 if (klass->is_instance_klass()) { 1245 InstanceKlass* ik = InstanceKlass::cast(klass); 1246 size = ik->local_interfaces()->length(); 1247 } else { 1248 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass"); 1249 size = 2; 1250 } 1251 1252 // Allocate result array 1253 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1254 objArrayHandle result (THREAD, r); 1255 // Fill in result 1256 if (klass->is_instance_klass()) { 1257 // Regular instance klass, fill in all local interfaces 1258 for (int index = 0; index < size; index++) { 1259 InstanceKlass* ik = InstanceKlass::cast(klass); 1260 Klass* k = ik->local_interfaces()->at(index); 1261 result->obj_at_put(index, k->java_mirror()); 1262 } 1263 } else { 1264 // All arrays implement java.lang.Cloneable and java.io.Serializable 1265 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1266 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1267 } 1268 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1269 JVM_END 1270 1271 1272 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1273 oop mirror = JNIHandles::resolve_non_null(cls); 1274 if (java_lang_Class::is_primitive(mirror)) { 1275 return JNI_FALSE; 1276 } 1277 Klass* k = java_lang_Class::as_Klass(mirror); 1278 jboolean result = k->is_interface(); 1279 assert(!result || k->is_instance_klass(), 1280 "all interfaces are instance types"); 1281 // The compiler intrinsic for isInterface tests the 1282 // Klass::_access_flags bits in the same way. 1283 return result; 1284 JVM_END 1285 1286 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1287 oop mirror = JNIHandles::resolve_non_null(cls); 1288 if (java_lang_Class::is_primitive(mirror)) { 1289 return JNI_FALSE; 1290 } 1291 Klass* k = java_lang_Class::as_Klass(mirror); 1292 return k->is_hidden(); 1293 JVM_END 1294 1295 JVM_ENTRY(jboolean, JVM_IsIdentityClass(JNIEnv *env, jclass cls)) 1296 oop mirror = JNIHandles::resolve_non_null(cls); 1297 if (java_lang_Class::is_primitive(mirror)) { 1298 return JNI_FALSE; 1299 } 1300 Klass* k = java_lang_Class::as_Klass(mirror); 1301 if (EnableValhalla) { 1302 return k->is_array_klass() || k->is_identity_class(); 1303 } else { 1304 return k->is_interface() ? JNI_FALSE : JNI_TRUE; 1305 } 1306 JVM_END 1307 1308 JVM_ENTRY(jboolean, JVM_IsImplicitlyConstructibleClass(JNIEnv *env, jclass cls)) 1309 oop mirror = JNIHandles::resolve_non_null(cls); 1310 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1311 return ik->is_implicitly_constructible(); 1312 JVM_END 1313 1314 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1315 JvmtiVMObjectAllocEventCollector oam; 1316 oop mirror = JNIHandles::resolve_non_null(cls); 1317 if (java_lang_Class::is_primitive(mirror)) { 1318 // There are no signers for primitive types 1319 return nullptr; 1320 } 1321 1322 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror)); 1323 1324 // If there are no signers set in the class, or if the class 1325 // is an array, return null. 1326 if (signers == nullptr) return nullptr; 1327 1328 // copy of the signers array 1329 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1330 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1331 for (int index = 0; index < signers->length(); index++) { 1332 signers_copy->obj_at_put(index, signers->obj_at(index)); 1333 } 1334 1335 // return the copy 1336 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy); 1337 JVM_END 1338 1339 1340 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1341 oop mirror = JNIHandles::resolve_non_null(cls); 1342 if (!java_lang_Class::is_primitive(mirror)) { 1343 // This call is ignored for primitive types and arrays. 1344 // Signers are only set once, ClassLoader.java, and thus shouldn't 1345 // be called with an array. Only the bootstrap loader creates arrays. 1346 Klass* k = java_lang_Class::as_Klass(mirror); 1347 if (k->is_instance_klass()) { 1348 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1349 } 1350 } 1351 JVM_END 1352 1353 1354 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1355 oop mirror = JNIHandles::resolve_non_null(cls); 1356 if (mirror == nullptr) { 1357 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 1358 } 1359 1360 if (java_lang_Class::is_primitive(mirror)) { 1361 // Primitive types does not have a protection domain. 1362 return nullptr; 1363 } 1364 1365 oop pd = java_lang_Class::protection_domain(mirror); 1366 return (jobject) JNIHandles::make_local(THREAD, pd); 1367 JVM_END 1368 1369 1370 // Returns the inherited_access_control_context field of the running thread. 1371 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1372 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1373 return JNIHandles::make_local(THREAD, result); 1374 JVM_END 1375 1376 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1377 if (!UsePrivilegedStack) return nullptr; 1378 1379 ResourceMark rm(THREAD); 1380 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1381 JvmtiVMObjectAllocEventCollector oam; 1382 1383 // count the protection domains on the execution stack. We collapse 1384 // duplicate consecutive protection domains into a single one, as 1385 // well as stopping when we hit a privileged frame. 1386 1387 oop previous_protection_domain = nullptr; 1388 Handle privileged_context(thread, nullptr); 1389 bool is_privileged = false; 1390 oop protection_domain = nullptr; 1391 1392 // Iterate through Java frames 1393 vframeStream vfst(thread); 1394 for(; !vfst.at_end(); vfst.next()) { 1395 // get method of frame 1396 Method* method = vfst.method(); 1397 1398 // stop at the first privileged frame 1399 if (method->method_holder() == vmClasses::AccessController_klass() && 1400 method->name() == vmSymbols::executePrivileged_name()) 1401 { 1402 // this frame is privileged 1403 is_privileged = true; 1404 1405 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1406 1407 StackValueCollection* locals = priv->locals(); 1408 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1409 StackValue* clr_sv = locals->at(2); // Class<?> caller 1410 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1411 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1412 privileged_context = ctx_sv->get_obj(); 1413 Handle caller = clr_sv->get_obj(); 1414 1415 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1416 protection_domain = caller_klass->protection_domain(); 1417 } else { 1418 protection_domain = method->method_holder()->protection_domain(); 1419 } 1420 1421 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) { 1422 local_array->push(Handle(thread, protection_domain)); 1423 previous_protection_domain = protection_domain; 1424 } 1425 1426 if (is_privileged) break; 1427 } 1428 1429 1430 // either all the domains on the stack were system domains, or 1431 // we had a privileged system domain 1432 if (local_array->is_empty()) { 1433 if (is_privileged && privileged_context.is_null()) return nullptr; 1434 1435 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1436 return JNIHandles::make_local(THREAD, result); 1437 } 1438 1439 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(), 1440 local_array->length(), CHECK_NULL); 1441 objArrayHandle h_context(thread, context); 1442 for (int index = 0; index < local_array->length(); index++) { 1443 h_context->obj_at_put(index, local_array->at(index)()); 1444 } 1445 1446 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1447 1448 return JNIHandles::make_local(THREAD, result); 1449 JVM_END 1450 1451 class ScopedValueBindingsResolver { 1452 public: 1453 InstanceKlass* Carrier_klass; 1454 ScopedValueBindingsResolver(JavaThread* THREAD) { 1455 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD); 1456 Carrier_klass = InstanceKlass::cast(k); 1457 } 1458 }; 1459 1460 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1461 ResourceMark rm(THREAD); 1462 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1463 JvmtiVMObjectAllocEventCollector oam; 1464 1465 static ScopedValueBindingsResolver resolver(THREAD); 1466 1467 // Iterate through Java frames 1468 vframeStream vfst(thread); 1469 for(; !vfst.at_end(); vfst.next()) { 1470 int loc = -1; 1471 // get method of frame 1472 Method* method = vfst.method(); 1473 1474 Symbol *name = method->name(); 1475 1476 InstanceKlass* holder = method->method_holder(); 1477 if (name == vmSymbols::runWith_method_name()) { 1478 if (holder == vmClasses::Thread_klass() 1479 || holder == resolver.Carrier_klass) { 1480 loc = 1; 1481 } 1482 } 1483 1484 if (loc != -1) { 1485 javaVFrame *frame = vfst.asJavaVFrame(); 1486 StackValueCollection* locals = frame->locals(); 1487 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot 1488 Handle result = head_sv->get_obj(); 1489 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1490 if (result() != nullptr) { 1491 return JNIHandles::make_local(THREAD, result()); 1492 } 1493 } 1494 } 1495 1496 return nullptr; 1497 JVM_END 1498 1499 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1500 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1501 return (k != nullptr) && k->is_array_klass() ? true : false; 1502 JVM_END 1503 1504 1505 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1506 oop mirror = JNIHandles::resolve_non_null(cls); 1507 return (jboolean) java_lang_Class::is_primitive(mirror); 1508 JVM_END 1509 1510 1511 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1512 oop mirror = JNIHandles::resolve_non_null(cls); 1513 if (java_lang_Class::is_primitive(mirror)) { 1514 // Primitive type 1515 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1516 } 1517 1518 Klass* k = java_lang_Class::as_Klass(mirror); 1519 debug_only(int computed_modifiers = k->compute_modifier_flags()); 1520 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1521 return k->modifier_flags(); 1522 JVM_END 1523 1524 1525 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1526 1527 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1528 JvmtiVMObjectAllocEventCollector oam; 1529 // ofClass is a reference to a java_lang_Class object. The mirror object 1530 // of an InstanceKlass 1531 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1532 if (java_lang_Class::is_primitive(ofMirror) || 1533 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1534 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1535 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1536 } 1537 1538 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1539 InnerClassesIterator iter(k); 1540 1541 if (iter.length() == 0) { 1542 // Neither an inner nor outer class 1543 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1544 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1545 } 1546 1547 // find inner class info 1548 constantPoolHandle cp(thread, k->constants()); 1549 int length = iter.length(); 1550 1551 // Allocate temp. result array 1552 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL); 1553 objArrayHandle result (THREAD, r); 1554 int members = 0; 1555 1556 for (; !iter.done(); iter.next()) { 1557 int ioff = iter.inner_class_info_index(); 1558 int ooff = iter.outer_class_info_index(); 1559 1560 if (ioff != 0 && ooff != 0) { 1561 // Check to see if the name matches the class we're looking for 1562 // before attempting to find the class. 1563 if (cp->klass_name_at_matches(k, ooff)) { 1564 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1565 if (outer_klass == k) { 1566 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1567 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1568 1569 // Throws an exception if outer klass has not declared k as 1570 // an inner klass 1571 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1572 1573 result->obj_at_put(members, inner_klass->java_mirror()); 1574 members++; 1575 } 1576 } 1577 } 1578 } 1579 1580 if (members != length) { 1581 // Return array of right length 1582 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL); 1583 for(int i = 0; i < members; i++) { 1584 res->obj_at_put(i, result->obj_at(i)); 1585 } 1586 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1587 } 1588 1589 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1590 JVM_END 1591 1592 1593 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1594 { 1595 // ofClass is a reference to a java_lang_Class object. 1596 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1597 if (java_lang_Class::is_primitive(ofMirror)) { 1598 return nullptr; 1599 } 1600 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1601 if (!klass->is_instance_klass()) { 1602 return nullptr; 1603 } 1604 1605 bool inner_is_member = false; 1606 Klass* outer_klass 1607 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1608 if (outer_klass == nullptr) return nullptr; // already a top-level class 1609 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1610 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1611 } 1612 JVM_END 1613 1614 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1615 { 1616 oop mirror = JNIHandles::resolve_non_null(cls); 1617 if (java_lang_Class::is_primitive(mirror)) { 1618 return nullptr; 1619 } 1620 Klass* klass = java_lang_Class::as_Klass(mirror); 1621 if (!klass->is_instance_klass()) { 1622 return nullptr; 1623 } 1624 InstanceKlass* k = InstanceKlass::cast(klass); 1625 int ooff = 0, noff = 0; 1626 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1627 if (noff != 0) { 1628 constantPoolHandle i_cp(thread, k->constants()); 1629 Symbol* name = i_cp->symbol_at(noff); 1630 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1631 return (jstring) JNIHandles::make_local(THREAD, str()); 1632 } 1633 } 1634 return nullptr; 1635 } 1636 JVM_END 1637 1638 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1639 assert (cls != nullptr, "illegal class"); 1640 JvmtiVMObjectAllocEventCollector oam; 1641 ResourceMark rm(THREAD); 1642 oop mirror = JNIHandles::resolve_non_null(cls); 1643 // Return null for arrays and primitives 1644 if (!java_lang_Class::is_primitive(mirror)) { 1645 Klass* k = java_lang_Class::as_Klass(mirror); 1646 if (k->is_instance_klass()) { 1647 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1648 if (sym == nullptr) return nullptr; 1649 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1650 return (jstring) JNIHandles::make_local(THREAD, str()); 1651 } 1652 } 1653 return nullptr; 1654 JVM_END 1655 1656 1657 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1658 assert (cls != nullptr, "illegal class"); 1659 oop mirror = JNIHandles::resolve_non_null(cls); 1660 // Return null for arrays and primitives 1661 if (!java_lang_Class::is_primitive(mirror)) { 1662 Klass* k = java_lang_Class::as_Klass(mirror); 1663 if (k->is_instance_klass()) { 1664 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1665 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1666 } 1667 } 1668 return nullptr; 1669 JVM_END 1670 1671 1672 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1673 // some of this code was adapted from from jni_FromReflectedField 1674 1675 oop reflected = JNIHandles::resolve_non_null(field); 1676 oop mirror = java_lang_reflect_Field::clazz(reflected); 1677 Klass* k = java_lang_Class::as_Klass(mirror); 1678 int slot = java_lang_reflect_Field::slot(reflected); 1679 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1680 1681 InstanceKlass* ik = InstanceKlass::cast(k); 1682 int offset = ik->field_offset(slot); 1683 1684 if (modifiers & JVM_ACC_STATIC) { 1685 // for static fields we only look in the current class 1686 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1687 assert(false, "cannot find static field"); 1688 return false; 1689 } 1690 } else { 1691 // for instance fields we start with the current class and work 1692 // our way up through the superclass chain 1693 if (!ik->find_field_from_offset(offset, false, &fd)) { 1694 assert(false, "cannot find instance field"); 1695 return false; 1696 } 1697 } 1698 return true; 1699 } 1700 1701 static Method* jvm_get_method_common(jobject method) { 1702 // some of this code was adapted from from jni_FromReflectedMethod 1703 1704 oop reflected = JNIHandles::resolve_non_null(method); 1705 oop mirror = nullptr; 1706 int slot = 0; 1707 1708 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1709 mirror = java_lang_reflect_Constructor::clazz(reflected); 1710 slot = java_lang_reflect_Constructor::slot(reflected); 1711 } else { 1712 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1713 "wrong type"); 1714 mirror = java_lang_reflect_Method::clazz(reflected); 1715 slot = java_lang_reflect_Method::slot(reflected); 1716 } 1717 Klass* k = java_lang_Class::as_Klass(mirror); 1718 1719 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1720 assert(m != nullptr, "cannot find method"); 1721 return m; // caller has to deal with null in product mode 1722 } 1723 1724 /* Type use annotations support (JDK 1.8) */ 1725 1726 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1727 assert (cls != nullptr, "illegal class"); 1728 ResourceMark rm(THREAD); 1729 // Return null for arrays and primitives 1730 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1731 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1732 if (k->is_instance_klass()) { 1733 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1734 if (type_annotations != nullptr) { 1735 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1736 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1737 } 1738 } 1739 } 1740 return nullptr; 1741 JVM_END 1742 1743 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1744 assert (method != nullptr, "illegal method"); 1745 // method is a handle to a java.lang.reflect.Method object 1746 Method* m = jvm_get_method_common(method); 1747 if (m == nullptr) { 1748 return nullptr; 1749 } 1750 1751 AnnotationArray* type_annotations = m->type_annotations(); 1752 if (type_annotations != nullptr) { 1753 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1754 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1755 } 1756 1757 return nullptr; 1758 JVM_END 1759 1760 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1761 assert (field != nullptr, "illegal field"); 1762 fieldDescriptor fd; 1763 bool gotFd = jvm_get_field_common(field, fd); 1764 if (!gotFd) { 1765 return nullptr; 1766 } 1767 1768 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1769 JVM_END 1770 1771 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1772 if (!cp->is_within_bounds(index)) { 1773 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1774 } 1775 } 1776 1777 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1778 { 1779 // method is a handle to a java.lang.reflect.Method object 1780 Method* method_ptr = jvm_get_method_common(method); 1781 methodHandle mh (THREAD, method_ptr); 1782 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1783 const int num_params = mh->method_parameters_length(); 1784 1785 if (num_params < 0) { 1786 // A -1 return value from method_parameters_length means there is no 1787 // parameter data. Return null to indicate this to the reflection 1788 // API. 1789 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1790 return (jobjectArray)nullptr; 1791 } else { 1792 // Otherwise, we return something up to reflection, even if it is 1793 // a zero-length array. Why? Because in some cases this can 1794 // trigger a MalformedParametersException. 1795 1796 // make sure all the symbols are properly formatted 1797 for (int i = 0; i < num_params; i++) { 1798 MethodParametersElement* params = mh->method_parameters_start(); 1799 int index = params[i].name_cp_index; 1800 constantPoolHandle cp(THREAD, mh->constants()); 1801 bounds_check(cp, index, CHECK_NULL); 1802 1803 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1804 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1805 "Wrong type at constant pool index"); 1806 } 1807 1808 } 1809 1810 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1811 objArrayHandle result (THREAD, result_oop); 1812 1813 for (int i = 0; i < num_params; i++) { 1814 MethodParametersElement* params = mh->method_parameters_start(); 1815 // For a 0 index, give a null symbol 1816 Symbol* sym = 0 != params[i].name_cp_index ? 1817 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1818 int flags = params[i].flags; 1819 oop param = Reflection::new_parameter(reflected_method, i, sym, 1820 flags, CHECK_NULL); 1821 result->obj_at_put(i, param); 1822 } 1823 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1824 } 1825 } 1826 JVM_END 1827 1828 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1829 1830 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1831 { 1832 JvmtiVMObjectAllocEventCollector oam; 1833 1834 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1835 // Exclude primitive types and array types 1836 if (java_lang_Class::is_primitive(ofMirror) || 1837 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1838 // Return empty array 1839 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1840 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1841 } 1842 1843 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1844 constantPoolHandle cp(THREAD, k->constants()); 1845 1846 // Ensure class is linked 1847 k->link_class(CHECK_NULL); 1848 1849 // Allocate result 1850 int num_fields; 1851 1852 if (publicOnly) { 1853 num_fields = 0; 1854 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1855 if (fs.access_flags().is_public()) ++num_fields; 1856 } 1857 } else { 1858 num_fields = k->java_fields_count(); 1859 } 1860 1861 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1862 objArrayHandle result (THREAD, r); 1863 1864 int out_idx = 0; 1865 fieldDescriptor fd; 1866 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1867 if (!publicOnly || fs.access_flags().is_public()) { 1868 fd.reinitialize(k, fs.index()); 1869 oop field = Reflection::new_field(&fd, CHECK_NULL); 1870 result->obj_at_put(out_idx, field); 1871 ++out_idx; 1872 } 1873 } 1874 assert(out_idx == num_fields, "just checking"); 1875 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1876 } 1877 JVM_END 1878 1879 // A class is a record if and only if it is final and a direct subclass of 1880 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1881 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1882 { 1883 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1884 if (k != nullptr && k->is_instance_klass()) { 1885 InstanceKlass* ik = InstanceKlass::cast(k); 1886 return ik->is_record(); 1887 } else { 1888 return false; 1889 } 1890 } 1891 JVM_END 1892 1893 // Returns an array containing the components of the Record attribute, 1894 // or null if the attribute is not present. 1895 // 1896 // Note that this function returns the components of the Record attribute 1897 // even if the class is not a record. 1898 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1899 { 1900 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1901 assert(c->is_instance_klass(), "must be"); 1902 InstanceKlass* ik = InstanceKlass::cast(c); 1903 1904 Array<RecordComponent*>* components = ik->record_components(); 1905 if (components != nullptr) { 1906 JvmtiVMObjectAllocEventCollector oam; 1907 constantPoolHandle cp(THREAD, ik->constants()); 1908 int length = components->length(); 1909 assert(length >= 0, "unexpected record_components length"); 1910 objArrayOop record_components = 1911 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1912 objArrayHandle components_h (THREAD, record_components); 1913 1914 for (int x = 0; x < length; x++) { 1915 RecordComponent* component = components->at(x); 1916 assert(component != nullptr, "unexpected null record component"); 1917 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1918 components_h->obj_at_put(x, component_oop); 1919 } 1920 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1921 } 1922 1923 return nullptr; 1924 } 1925 JVM_END 1926 1927 static bool select_method(const methodHandle& method, bool want_constructor) { 1928 bool is_ctor = (method->is_object_constructor()); 1929 if (want_constructor) { 1930 return is_ctor; 1931 } else { 1932 return (!is_ctor && 1933 !method->is_class_initializer() && 1934 !method->is_overpass()); 1935 } 1936 } 1937 1938 static jobjectArray get_class_declared_methods_helper( 1939 JNIEnv *env, 1940 jclass ofClass, jboolean publicOnly, 1941 bool want_constructor, 1942 Klass* klass, TRAPS) { 1943 1944 JvmtiVMObjectAllocEventCollector oam; 1945 1946 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1947 // Exclude primitive types and array types 1948 if (java_lang_Class::is_primitive(ofMirror) 1949 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1950 // Return empty array 1951 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1952 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1953 } 1954 1955 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1956 1957 // Ensure class is linked 1958 k->link_class(CHECK_NULL); 1959 1960 Array<Method*>* methods = k->methods(); 1961 int methods_length = methods->length(); 1962 1963 // Save original method_idnum in case of redefinition, which can change 1964 // the idnum of obsolete methods. The new method will have the same idnum 1965 // but if we refresh the methods array, the counts will be wrong. 1966 ResourceMark rm(THREAD); 1967 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1968 int num_methods = 0; 1969 1970 for (int i = 0; i < methods_length; i++) { 1971 methodHandle method(THREAD, methods->at(i)); 1972 if (select_method(method, want_constructor)) { 1973 if (!publicOnly || method->is_public()) { 1974 idnums->push(method->method_idnum()); 1975 ++num_methods; 1976 } 1977 } 1978 } 1979 1980 // Allocate result 1981 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1982 objArrayHandle result (THREAD, r); 1983 1984 // Now just put the methods that we selected above, but go by their idnum 1985 // in case of redefinition. The methods can be redefined at any safepoint, 1986 // so above when allocating the oop array and below when creating reflect 1987 // objects. 1988 for (int i = 0; i < num_methods; i++) { 1989 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1990 if (method.is_null()) { 1991 // Method may have been deleted and seems this API can handle null 1992 // Otherwise should probably put a method that throws NSME 1993 result->obj_at_put(i, nullptr); 1994 } else { 1995 oop m; 1996 if (want_constructor) { 1997 assert(method->is_object_constructor(), "must be"); 1998 m = Reflection::new_constructor(method, CHECK_NULL); 1999 } else { 2000 m = Reflection::new_method(method, false, CHECK_NULL); 2001 } 2002 result->obj_at_put(i, m); 2003 } 2004 } 2005 2006 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 2007 } 2008 2009 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 2010 { 2011 return get_class_declared_methods_helper(env, ofClass, publicOnly, 2012 /*want_constructor*/ false, 2013 vmClasses::reflect_Method_klass(), THREAD); 2014 } 2015 JVM_END 2016 2017 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 2018 { 2019 return get_class_declared_methods_helper(env, ofClass, publicOnly, 2020 /*want_constructor*/ true, 2021 vmClasses::reflect_Constructor_klass(), THREAD); 2022 } 2023 JVM_END 2024 2025 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 2026 { 2027 oop mirror = JNIHandles::resolve_non_null(cls); 2028 if (java_lang_Class::is_primitive(mirror)) { 2029 // Primitive type 2030 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 2031 } 2032 2033 Klass* k = java_lang_Class::as_Klass(mirror); 2034 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 2035 } 2036 JVM_END 2037 2038 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 2039 { 2040 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2041 assert(c->is_instance_klass(), "must be"); 2042 InstanceKlass* ck = InstanceKlass::cast(c); 2043 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 2044 assert(m->is_instance_klass(), "must be"); 2045 InstanceKlass* mk = InstanceKlass::cast(m); 2046 return ck->has_nestmate_access_to(mk, THREAD); 2047 } 2048 JVM_END 2049 2050 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 2051 { 2052 // current is not a primitive or array class 2053 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2054 assert(c->is_instance_klass(), "must be"); 2055 InstanceKlass* ck = InstanceKlass::cast(c); 2056 InstanceKlass* host = ck->nest_host(THREAD); 2057 return (jclass) (host == nullptr ? nullptr : 2058 JNIHandles::make_local(THREAD, host->java_mirror())); 2059 } 2060 JVM_END 2061 2062 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 2063 { 2064 // current is not a primitive or array class 2065 ResourceMark rm(THREAD); 2066 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2067 assert(c->is_instance_klass(), "must be"); 2068 InstanceKlass* ck = InstanceKlass::cast(c); 2069 InstanceKlass* host = ck->nest_host(THREAD); 2070 2071 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 2072 ck->external_name(), host->external_name()); 2073 { 2074 JvmtiVMObjectAllocEventCollector oam; 2075 Array<u2>* members = host->nest_members(); 2076 int length = members == nullptr ? 0 : members->length(); 2077 2078 log_trace(class, nestmates)(" - host has %d listed nest members", length); 2079 2080 // nest host is first in the array so make it one bigger 2081 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2082 length + 1, CHECK_NULL); 2083 objArrayHandle result(THREAD, r); 2084 result->obj_at_put(0, host->java_mirror()); 2085 if (length != 0) { 2086 int count = 0; 2087 for (int i = 0; i < length; i++) { 2088 int cp_index = members->at(i); 2089 Klass* k = host->constants()->klass_at(cp_index, THREAD); 2090 if (HAS_PENDING_EXCEPTION) { 2091 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2092 return nullptr; // propagate VMEs 2093 } 2094 if (log_is_enabled(Trace, class, nestmates)) { 2095 stringStream ss; 2096 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2097 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2098 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2099 log_trace(class, nestmates)("%s", ss.as_string()); 2100 } 2101 CLEAR_PENDING_EXCEPTION; 2102 continue; 2103 } 2104 if (k->is_instance_klass()) { 2105 InstanceKlass* ik = InstanceKlass::cast(k); 2106 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2107 if (nest_host_k == host) { 2108 result->obj_at_put(count+1, k->java_mirror()); 2109 count++; 2110 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2111 } else { 2112 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2113 ik->external_name(), nest_host_k->external_name()); 2114 } 2115 } else { 2116 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2117 k->external_name()); 2118 } 2119 } 2120 if (count < length) { 2121 // we had invalid entries so we need to compact the array 2122 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2123 length + 1, count + 1); 2124 2125 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2126 count + 1, CHECK_NULL); 2127 objArrayHandle result2(THREAD, r2); 2128 for (int i = 0; i < count + 1; i++) { 2129 result2->obj_at_put(i, result->obj_at(i)); 2130 } 2131 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2132 } 2133 } 2134 else { 2135 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate"); 2136 } 2137 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2138 } 2139 } 2140 JVM_END 2141 2142 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2143 { 2144 oop mirror = JNIHandles::resolve_non_null(current); 2145 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2146 Klass* c = java_lang_Class::as_Klass(mirror); 2147 assert(c->is_instance_klass(), "must be"); 2148 InstanceKlass* ik = InstanceKlass::cast(c); 2149 ResourceMark rm(THREAD); 2150 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2151 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2152 if (ik->is_sealed()) { 2153 JvmtiVMObjectAllocEventCollector oam; 2154 Array<u2>* subclasses = ik->permitted_subclasses(); 2155 int length = subclasses->length(); 2156 2157 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2158 2159 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2160 length, CHECK_NULL); 2161 objArrayHandle result(THREAD, r); 2162 int count = 0; 2163 for (int i = 0; i < length; i++) { 2164 int cp_index = subclasses->at(i); 2165 Klass* k = ik->constants()->klass_at(cp_index, THREAD); 2166 if (HAS_PENDING_EXCEPTION) { 2167 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2168 return nullptr; // propagate VMEs 2169 } 2170 if (log_is_enabled(Trace, class, sealed)) { 2171 stringStream ss; 2172 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2173 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2174 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2175 log_trace(class, sealed)("%s", ss.as_string()); 2176 } 2177 2178 CLEAR_PENDING_EXCEPTION; 2179 continue; 2180 } 2181 if (k->is_instance_klass()) { 2182 result->obj_at_put(count++, k->java_mirror()); 2183 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2184 } 2185 } 2186 if (count < length) { 2187 // we had invalid entries so we need to compact the array 2188 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2189 count, CHECK_NULL); 2190 objArrayHandle result2(THREAD, r2); 2191 for (int i = 0; i < count; i++) { 2192 result2->obj_at_put(i, result->obj_at(i)); 2193 } 2194 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2195 } 2196 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2197 } else { 2198 return nullptr; 2199 } 2200 } 2201 JVM_END 2202 2203 // Constant pool access ////////////////////////////////////////////////////////// 2204 2205 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2206 { 2207 JvmtiVMObjectAllocEventCollector oam; 2208 oop mirror = JNIHandles::resolve_non_null(cls); 2209 // Return null for primitives and arrays 2210 if (!java_lang_Class::is_primitive(mirror)) { 2211 Klass* k = java_lang_Class::as_Klass(mirror); 2212 if (k->is_instance_klass()) { 2213 InstanceKlass* k_h = InstanceKlass::cast(k); 2214 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2215 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2216 return JNIHandles::make_local(THREAD, jcp()); 2217 } 2218 } 2219 return nullptr; 2220 } 2221 JVM_END 2222 2223 2224 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2225 { 2226 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2227 return cp->length(); 2228 } 2229 JVM_END 2230 2231 2232 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2233 { 2234 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2235 bounds_check(cp, index, CHECK_NULL); 2236 constantTag tag = cp->tag_at(index); 2237 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2238 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2239 } 2240 Klass* k = cp->klass_at(index, CHECK_NULL); 2241 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2242 } 2243 JVM_END 2244 2245 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2246 { 2247 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2248 bounds_check(cp, index, CHECK_NULL); 2249 constantTag tag = cp->tag_at(index); 2250 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2251 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2252 } 2253 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2254 if (k == nullptr) return nullptr; 2255 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2256 } 2257 JVM_END 2258 2259 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2260 constantTag tag = cp->tag_at(index); 2261 if (!tag.is_method() && !tag.is_interface_method()) { 2262 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2263 } 2264 int klass_ref = cp->uncached_klass_ref_index_at(index); 2265 Klass* k_o; 2266 if (force_resolution) { 2267 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2268 } else { 2269 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2270 if (k_o == nullptr) return nullptr; 2271 } 2272 InstanceKlass* k = InstanceKlass::cast(k_o); 2273 Symbol* name = cp->uncached_name_ref_at(index); 2274 Symbol* sig = cp->uncached_signature_ref_at(index); 2275 methodHandle m (THREAD, k->find_method(name, sig)); 2276 if (m.is_null()) { 2277 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2278 } 2279 oop method; 2280 if (m->is_object_constructor()) { 2281 method = Reflection::new_constructor(m, CHECK_NULL); 2282 } else { 2283 method = Reflection::new_method(m, true, CHECK_NULL); 2284 } 2285 return JNIHandles::make_local(THREAD, method); 2286 } 2287 2288 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2289 { 2290 JvmtiVMObjectAllocEventCollector oam; 2291 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2292 bounds_check(cp, index, CHECK_NULL); 2293 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2294 return res; 2295 } 2296 JVM_END 2297 2298 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2299 { 2300 JvmtiVMObjectAllocEventCollector oam; 2301 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2302 bounds_check(cp, index, CHECK_NULL); 2303 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2304 return res; 2305 } 2306 JVM_END 2307 2308 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2309 constantTag tag = cp->tag_at(index); 2310 if (!tag.is_field()) { 2311 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2312 } 2313 int klass_ref = cp->uncached_klass_ref_index_at(index); 2314 Klass* k_o; 2315 if (force_resolution) { 2316 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2317 } else { 2318 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2319 if (k_o == nullptr) return nullptr; 2320 } 2321 InstanceKlass* k = InstanceKlass::cast(k_o); 2322 Symbol* name = cp->uncached_name_ref_at(index); 2323 Symbol* sig = cp->uncached_signature_ref_at(index); 2324 fieldDescriptor fd; 2325 Klass* target_klass = k->find_field(name, sig, &fd); 2326 if (target_klass == nullptr) { 2327 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2328 } 2329 oop field = Reflection::new_field(&fd, CHECK_NULL); 2330 return JNIHandles::make_local(THREAD, field); 2331 } 2332 2333 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2334 { 2335 JvmtiVMObjectAllocEventCollector oam; 2336 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2337 bounds_check(cp, index, CHECK_NULL); 2338 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2339 return res; 2340 } 2341 JVM_END 2342 2343 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2344 { 2345 JvmtiVMObjectAllocEventCollector oam; 2346 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2347 bounds_check(cp, index, CHECK_NULL); 2348 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2349 return res; 2350 } 2351 JVM_END 2352 2353 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2354 { 2355 JvmtiVMObjectAllocEventCollector oam; 2356 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2357 bounds_check(cp, index, CHECK_NULL); 2358 constantTag tag = cp->tag_at(index); 2359 if (!tag.is_field_or_method()) { 2360 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2361 } 2362 int klass_ref = cp->uncached_klass_ref_index_at(index); 2363 Symbol* klass_name = cp->klass_name_at(klass_ref); 2364 Symbol* member_name = cp->uncached_name_ref_at(index); 2365 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2366 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2367 objArrayHandle dest(THREAD, dest_o); 2368 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2369 dest->obj_at_put(0, str()); 2370 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2371 dest->obj_at_put(1, str()); 2372 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2373 dest->obj_at_put(2, str()); 2374 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2375 } 2376 JVM_END 2377 2378 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2379 { 2380 JvmtiVMObjectAllocEventCollector oam; 2381 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2382 bounds_check(cp, index, CHECK_0); 2383 constantTag tag = cp->tag_at(index); 2384 if (!tag.is_field_or_method()) { 2385 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2386 } 2387 return (jint) cp->uncached_klass_ref_index_at(index); 2388 } 2389 JVM_END 2390 2391 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2392 { 2393 JvmtiVMObjectAllocEventCollector oam; 2394 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2395 bounds_check(cp, index, CHECK_0); 2396 constantTag tag = cp->tag_at(index); 2397 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2398 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2399 } 2400 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2401 } 2402 JVM_END 2403 2404 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2405 { 2406 JvmtiVMObjectAllocEventCollector oam; 2407 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2408 bounds_check(cp, index, CHECK_NULL); 2409 constantTag tag = cp->tag_at(index); 2410 if (!tag.is_name_and_type()) { 2411 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2412 } 2413 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2414 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2415 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2416 objArrayHandle dest(THREAD, dest_o); 2417 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2418 dest->obj_at_put(0, str()); 2419 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2420 dest->obj_at_put(1, str()); 2421 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2422 } 2423 JVM_END 2424 2425 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2426 { 2427 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2428 bounds_check(cp, index, CHECK_0); 2429 constantTag tag = cp->tag_at(index); 2430 if (!tag.is_int()) { 2431 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2432 } 2433 return cp->int_at(index); 2434 } 2435 JVM_END 2436 2437 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2438 { 2439 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2440 bounds_check(cp, index, CHECK_(0L)); 2441 constantTag tag = cp->tag_at(index); 2442 if (!tag.is_long()) { 2443 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2444 } 2445 return cp->long_at(index); 2446 } 2447 JVM_END 2448 2449 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2450 { 2451 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2452 bounds_check(cp, index, CHECK_(0.0f)); 2453 constantTag tag = cp->tag_at(index); 2454 if (!tag.is_float()) { 2455 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2456 } 2457 return cp->float_at(index); 2458 } 2459 JVM_END 2460 2461 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2462 { 2463 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2464 bounds_check(cp, index, CHECK_(0.0)); 2465 constantTag tag = cp->tag_at(index); 2466 if (!tag.is_double()) { 2467 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2468 } 2469 return cp->double_at(index); 2470 } 2471 JVM_END 2472 2473 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2474 { 2475 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2476 bounds_check(cp, index, CHECK_NULL); 2477 constantTag tag = cp->tag_at(index); 2478 if (!tag.is_string()) { 2479 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2480 } 2481 oop str = cp->string_at(index, CHECK_NULL); 2482 return (jstring) JNIHandles::make_local(THREAD, str); 2483 } 2484 JVM_END 2485 2486 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2487 { 2488 JvmtiVMObjectAllocEventCollector oam; 2489 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2490 bounds_check(cp, index, CHECK_NULL); 2491 constantTag tag = cp->tag_at(index); 2492 if (!tag.is_symbol()) { 2493 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2494 } 2495 Symbol* sym = cp->symbol_at(index); 2496 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2497 return (jstring) JNIHandles::make_local(THREAD, str()); 2498 } 2499 JVM_END 2500 2501 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2502 { 2503 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2504 bounds_check(cp, index, CHECK_0); 2505 constantTag tag = cp->tag_at(index); 2506 jbyte result = tag.value(); 2507 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2508 // they are changed to the corresponding tags from the JVM spec, so that java code in 2509 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2510 if (tag.is_klass_or_reference()) { 2511 result = JVM_CONSTANT_Class; 2512 } else if (tag.is_string_index()) { 2513 result = JVM_CONSTANT_String; 2514 } else if (tag.is_method_type_in_error()) { 2515 result = JVM_CONSTANT_MethodType; 2516 } else if (tag.is_method_handle_in_error()) { 2517 result = JVM_CONSTANT_MethodHandle; 2518 } else if (tag.is_dynamic_constant_in_error()) { 2519 result = JVM_CONSTANT_Dynamic; 2520 } 2521 return result; 2522 } 2523 JVM_END 2524 2525 // Assertion support. ////////////////////////////////////////////////////////// 2526 2527 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2528 assert(cls != nullptr, "bad class"); 2529 2530 oop r = JNIHandles::resolve(cls); 2531 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2532 if (java_lang_Class::is_primitive(r)) return false; 2533 2534 Klass* k = java_lang_Class::as_Klass(r); 2535 assert(k->is_instance_klass(), "must be an instance klass"); 2536 if (!k->is_instance_klass()) return false; 2537 2538 ResourceMark rm(THREAD); 2539 const char* name = k->name()->as_C_string(); 2540 bool system_class = k->class_loader() == nullptr; 2541 return JavaAssertions::enabled(name, system_class); 2542 2543 JVM_END 2544 2545 2546 // Return a new AssertionStatusDirectives object with the fields filled in with 2547 // command-line assertion arguments (i.e., -ea, -da). 2548 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2549 JvmtiVMObjectAllocEventCollector oam; 2550 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2551 return JNIHandles::make_local(THREAD, asd); 2552 JVM_END 2553 2554 // Arrays support ///////////////////////////////////////////////////////////// 2555 2556 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2557 oop o = JNIHandles::resolve(array); 2558 Klass* k = o->klass(); 2559 if ((o == nullptr) || (!k->is_array_klass())) { 2560 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2561 } 2562 return ArrayKlass::cast(k)->element_access_is_atomic(); 2563 JVM_END 2564 2565 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2566 oop o = JNIHandles::resolve(array); 2567 Klass* k = o->klass(); 2568 if ((o == nullptr) || (!k->is_array_klass())) { 2569 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2570 } 2571 if (k->is_flatArray_klass()) { 2572 FlatArrayKlass* vk = FlatArrayKlass::cast(k); 2573 if (!vk->element_access_is_atomic()) { 2574 /** 2575 * Need to decide how to implement: 2576 * 2577 * 1) Change to objArrayOop layout, therefore oop->klass() differs so 2578 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through 2579 * "checkcast" & "instanceof" 2580 * 2581 * 2) Use extra header in the flatArrayOop to flag atomicity required and 2582 * possibly per instance lock structure. Said info, could be placed in 2583 * "trailer" rather than disturb the current arrayOop 2584 */ 2585 Unimplemented(); 2586 } 2587 } 2588 return array; 2589 JVM_END 2590 2591 // Verification //////////////////////////////////////////////////////////////////////////////// 2592 2593 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2594 2595 // RedefineClasses support: bug 6214132 caused verification to fail. 2596 // All functions from this section should call the jvmtiThreadSate function: 2597 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2598 // The function returns a Klass* of the _scratch_class if the verifier 2599 // was invoked in the middle of the class redefinition. 2600 // Otherwise it returns its argument value which is the _the_class Klass*. 2601 // Please, refer to the description in the jvmtiThreadSate.hpp. 2602 2603 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2604 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2605 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2606 return k->name()->as_utf8(); 2607 JVM_END 2608 2609 2610 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2611 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2612 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2613 // types will have length zero if this is not an InstanceKlass 2614 // (length is determined by call to JVM_GetClassCPEntriesCount) 2615 if (k->is_instance_klass()) { 2616 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2617 for (int index = cp->length() - 1; index >= 0; index--) { 2618 constantTag tag = cp->tag_at(index); 2619 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2620 } 2621 } 2622 JVM_END 2623 2624 2625 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2626 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2627 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2628 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2629 JVM_END 2630 2631 2632 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2633 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2634 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2635 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2636 JVM_END 2637 2638 2639 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2640 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2641 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2642 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2643 JVM_END 2644 2645 2646 // The following methods, used for the verifier, are never called with 2647 // array klasses, so a direct cast to InstanceKlass is safe. 2648 // Typically, these methods are called in a loop with bounds determined 2649 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2650 // zero for arrays. 2651 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2652 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2653 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2654 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2655 int length = method->checked_exceptions_length(); 2656 if (length > 0) { 2657 CheckedExceptionElement* table= method->checked_exceptions_start(); 2658 for (int i = 0; i < length; i++) { 2659 exceptions[i] = table[i].class_cp_index; 2660 } 2661 } 2662 JVM_END 2663 2664 2665 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2666 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2667 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2668 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2669 return method->checked_exceptions_length(); 2670 JVM_END 2671 2672 2673 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2674 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2675 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2676 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2677 memcpy(code, method->code_base(), method->code_size()); 2678 JVM_END 2679 2680 2681 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2682 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2683 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2684 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2685 return method->code_size(); 2686 JVM_END 2687 2688 2689 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2690 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2691 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2692 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2693 ExceptionTable extable(method); 2694 entry->start_pc = extable.start_pc(entry_index); 2695 entry->end_pc = extable.end_pc(entry_index); 2696 entry->handler_pc = extable.handler_pc(entry_index); 2697 entry->catchType = extable.catch_type_index(entry_index); 2698 JVM_END 2699 2700 2701 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2702 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2703 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2704 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2705 return method->exception_table_length(); 2706 JVM_END 2707 2708 2709 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2710 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2711 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2712 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2713 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2714 JVM_END 2715 2716 2717 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2718 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2719 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2720 return InstanceKlass::cast(k)->field_access_flags(field_index); 2721 JVM_END 2722 2723 2724 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2725 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2726 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2727 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2728 return method->max_locals(); 2729 JVM_END 2730 2731 2732 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2733 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2734 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2735 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2736 return method->size_of_parameters(); 2737 JVM_END 2738 2739 2740 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2741 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2742 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2743 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2744 return method->verifier_max_stack(); 2745 JVM_END 2746 2747 2748 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2749 ResourceMark rm(THREAD); 2750 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2751 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2752 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2753 return method->is_object_constructor(); 2754 JVM_END 2755 2756 2757 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2758 ResourceMark rm(THREAD); 2759 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2760 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2761 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2762 return method->is_overpass(); 2763 JVM_END 2764 2765 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2766 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2767 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2768 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2769 return method->name()->as_utf8(); 2770 JVM_END 2771 2772 2773 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2774 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2775 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2776 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2777 return method->signature()->as_utf8(); 2778 JVM_END 2779 2780 /** 2781 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2782 * read entries in the constant pool. Since the old verifier always 2783 * works on a copy of the code, it will not see any rewriting that 2784 * may possibly occur in the middle of verification. So it is important 2785 * that nothing it calls tries to use the cpCache instead of the raw 2786 * constant pool, so we must use cp->uncached_x methods when appropriate. 2787 */ 2788 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2789 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2790 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2791 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2792 switch (cp->tag_at(cp_index).value()) { 2793 case JVM_CONSTANT_Fieldref: 2794 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2795 default: 2796 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2797 } 2798 ShouldNotReachHere(); 2799 return nullptr; 2800 JVM_END 2801 2802 2803 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2804 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2805 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2806 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2807 switch (cp->tag_at(cp_index).value()) { 2808 case JVM_CONSTANT_InterfaceMethodref: 2809 case JVM_CONSTANT_Methodref: 2810 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2811 default: 2812 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2813 } 2814 ShouldNotReachHere(); 2815 return nullptr; 2816 JVM_END 2817 2818 2819 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2820 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2821 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2822 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2823 switch (cp->tag_at(cp_index).value()) { 2824 case JVM_CONSTANT_InterfaceMethodref: 2825 case JVM_CONSTANT_Methodref: 2826 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2827 default: 2828 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2829 } 2830 ShouldNotReachHere(); 2831 return nullptr; 2832 JVM_END 2833 2834 2835 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2836 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2837 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2838 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2839 switch (cp->tag_at(cp_index).value()) { 2840 case JVM_CONSTANT_Fieldref: 2841 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2842 default: 2843 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2844 } 2845 ShouldNotReachHere(); 2846 return nullptr; 2847 JVM_END 2848 2849 2850 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(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 Symbol* classname = cp->klass_name_at(cp_index); 2855 return classname->as_utf8(); 2856 JVM_END 2857 2858 2859 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2860 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2861 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2862 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2863 switch (cp->tag_at(cp_index).value()) { 2864 case JVM_CONSTANT_Fieldref: { 2865 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2866 Symbol* classname = cp->klass_name_at(class_index); 2867 return classname->as_utf8(); 2868 } 2869 default: 2870 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2871 } 2872 ShouldNotReachHere(); 2873 return nullptr; 2874 JVM_END 2875 2876 2877 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2878 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2879 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2880 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2881 switch (cp->tag_at(cp_index).value()) { 2882 case JVM_CONSTANT_Methodref: 2883 case JVM_CONSTANT_InterfaceMethodref: { 2884 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2885 Symbol* classname = cp->klass_name_at(class_index); 2886 return classname->as_utf8(); 2887 } 2888 default: 2889 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2890 } 2891 ShouldNotReachHere(); 2892 return nullptr; 2893 JVM_END 2894 2895 2896 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(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 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2903 switch (cp->tag_at(cp_index).value()) { 2904 case JVM_CONSTANT_Fieldref: { 2905 Symbol* name = cp->uncached_name_ref_at(cp_index); 2906 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2907 InstanceKlass* ik = InstanceKlass::cast(k_called); 2908 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2909 if (fs.name() == name && fs.signature() == signature) { 2910 return fs.access_flags().as_short(); 2911 } 2912 } 2913 return -1; 2914 } 2915 default: 2916 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2917 } 2918 ShouldNotReachHere(); 2919 return 0; 2920 JVM_END 2921 2922 2923 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2924 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2925 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2926 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2927 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2928 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2929 switch (cp->tag_at(cp_index).value()) { 2930 case JVM_CONSTANT_Methodref: 2931 case JVM_CONSTANT_InterfaceMethodref: { 2932 Symbol* name = cp->uncached_name_ref_at(cp_index); 2933 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2934 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2935 int methods_count = methods->length(); 2936 for (int i = 0; i < methods_count; i++) { 2937 Method* method = methods->at(i); 2938 if (method->name() == name && method->signature() == signature) { 2939 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2940 } 2941 } 2942 return -1; 2943 } 2944 default: 2945 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2946 } 2947 ShouldNotReachHere(); 2948 return 0; 2949 JVM_END 2950 2951 2952 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2953 2954 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2955 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2956 JVM_END 2957 2958 2959 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2960 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2961 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2962 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2963 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2964 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2965 JVM_END 2966 2967 // Printing support ////////////////////////////////////////////////// 2968 extern "C" { 2969 2970 ATTRIBUTE_PRINTF(3, 0) 2971 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2972 // Reject count values that are negative signed values converted to 2973 // unsigned; see bug 4399518, 4417214 2974 if ((intptr_t)count <= 0) return -1; 2975 2976 int result = os::vsnprintf(str, count, fmt, args); 2977 if (result > 0 && (size_t)result >= count) { 2978 result = -1; 2979 } 2980 2981 return result; 2982 } 2983 2984 ATTRIBUTE_PRINTF(3, 4) 2985 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2986 va_list args; 2987 int len; 2988 va_start(args, fmt); 2989 len = jio_vsnprintf(str, count, fmt, args); 2990 va_end(args); 2991 return len; 2992 } 2993 2994 ATTRIBUTE_PRINTF(2, 3) 2995 int jio_fprintf(FILE* f, const char *fmt, ...) { 2996 int len; 2997 va_list args; 2998 va_start(args, fmt); 2999 len = jio_vfprintf(f, fmt, args); 3000 va_end(args); 3001 return len; 3002 } 3003 3004 ATTRIBUTE_PRINTF(2, 0) 3005 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 3006 if (Arguments::vfprintf_hook() != nullptr) { 3007 return Arguments::vfprintf_hook()(f, fmt, args); 3008 } else { 3009 return vfprintf(f, fmt, args); 3010 } 3011 } 3012 3013 ATTRIBUTE_PRINTF(1, 2) 3014 JNIEXPORT int jio_printf(const char *fmt, ...) { 3015 int len; 3016 va_list args; 3017 va_start(args, fmt); 3018 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 3019 va_end(args); 3020 return len; 3021 } 3022 3023 // HotSpot specific jio method 3024 void jio_print(const char* s, size_t len) { 3025 // Try to make this function as atomic as possible. 3026 if (Arguments::vfprintf_hook() != nullptr) { 3027 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 3028 } else { 3029 // Make an unused local variable to avoid warning from gcc compiler. 3030 bool dummy = os::write(defaultStream::output_fd(), s, len); 3031 } 3032 } 3033 3034 } // Extern C 3035 3036 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 3037 3038 // In most of the JVM thread support functions we need to access the 3039 // thread through a ThreadsListHandle to prevent it from exiting and 3040 // being reclaimed while we try to operate on it. The exceptions to this 3041 // rule are when operating on the current thread, or if the monitor of 3042 // the target java.lang.Thread is locked at the Java level - in both 3043 // cases the target cannot exit. 3044 3045 static void thread_entry(JavaThread* thread, TRAPS) { 3046 HandleMark hm(THREAD); 3047 Handle obj(THREAD, thread->threadObj()); 3048 JavaValue result(T_VOID); 3049 JavaCalls::call_virtual(&result, 3050 obj, 3051 vmClasses::Thread_klass(), 3052 vmSymbols::run_method_name(), 3053 vmSymbols::void_method_signature(), 3054 THREAD); 3055 } 3056 3057 3058 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 3059 #if INCLUDE_CDS 3060 if (CDSConfig::is_dumping_static_archive()) { 3061 // During java -Xshare:dump, if we allow multiple Java threads to 3062 // execute in parallel, symbols and classes may be loaded in 3063 // random orders which will make the resulting CDS archive 3064 // non-deterministic. 3065 // 3066 // Lucikly, during java -Xshare:dump, it's important to run only 3067 // the code in the main Java thread (which is NOT started here) that 3068 // creates the module graph, etc. It's safe to not start the other 3069 // threads which are launched by class static initializers 3070 // (ReferenceHandler, FinalizerThread and CleanerImpl). 3071 if (log_is_enabled(Info, cds)) { 3072 ResourceMark rm; 3073 oop t = JNIHandles::resolve_non_null(jthread); 3074 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 3075 } 3076 return; 3077 } 3078 #endif 3079 JavaThread *native_thread = nullptr; 3080 3081 // We cannot hold the Threads_lock when we throw an exception, 3082 // due to rank ordering issues. Example: we might need to grab the 3083 // Heap_lock while we construct the exception. 3084 bool throw_illegal_thread_state = false; 3085 3086 // We must release the Threads_lock before we can post a jvmti event 3087 // in Thread::start. 3088 { 3089 // Ensure that the C++ Thread and OSThread structures aren't freed before 3090 // we operate. 3091 MutexLocker mu(Threads_lock); 3092 3093 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 3094 // re-starting an already started thread, so we should usually find 3095 // that the JavaThread is null. However for a JNI attached thread 3096 // there is a small window between the Thread object being created 3097 // (with its JavaThread set) and the update to its threadStatus, so we 3098 // have to check for this 3099 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 3100 throw_illegal_thread_state = true; 3101 } else { 3102 jlong size = 3103 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 3104 // Allocate the C++ Thread structure and create the native thread. The 3105 // stack size retrieved from java is 64-bit signed, but the constructor takes 3106 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 3107 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 3108 // - Avoid passing negative values which would result in really large stacks. 3109 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 3110 size_t sz = size > 0 ? (size_t) size : 0; 3111 native_thread = new JavaThread(&thread_entry, sz); 3112 3113 // At this point it may be possible that no osthread was created for the 3114 // JavaThread due to lack of memory. Check for this situation and throw 3115 // an exception if necessary. Eventually we may want to change this so 3116 // that we only grab the lock if the thread was created successfully - 3117 // then we can also do this check and throw the exception in the 3118 // JavaThread constructor. 3119 if (native_thread->osthread() != nullptr) { 3120 // Note: the current thread is not being used within "prepare". 3121 native_thread->prepare(jthread); 3122 } 3123 } 3124 } 3125 3126 if (throw_illegal_thread_state) { 3127 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3128 } 3129 3130 assert(native_thread != nullptr, "Starting null thread?"); 3131 3132 if (native_thread->osthread() == nullptr) { 3133 ResourceMark rm(thread); 3134 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 3135 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 3136 // No one should hold a reference to the 'native_thread'. 3137 native_thread->smr_delete(); 3138 if (JvmtiExport::should_post_resource_exhausted()) { 3139 JvmtiExport::post_resource_exhausted( 3140 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3141 os::native_thread_creation_failed_msg()); 3142 } 3143 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3144 os::native_thread_creation_failed_msg()); 3145 } 3146 3147 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3148 3149 Thread::start(native_thread); 3150 3151 JVM_END 3152 3153 3154 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3155 ThreadsListHandle tlh(thread); 3156 oop java_thread = nullptr; 3157 JavaThread* receiver = nullptr; 3158 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3159 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3160 3161 if (is_alive) { 3162 // jthread refers to a live JavaThread. 3163 Thread::set_priority(receiver, (ThreadPriority)prio); 3164 } 3165 // Implied else: If the JavaThread hasn't started yet, then the 3166 // priority set in the java.lang.Thread object above will be pushed 3167 // down when it does start. 3168 JVM_END 3169 3170 3171 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3172 if (os::dont_yield()) return; 3173 HOTSPOT_THREAD_YIELD(); 3174 os::naked_yield(); 3175 JVM_END 3176 3177 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos)) 3178 if (nanos < 0) { 3179 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range"); 3180 } 3181 3182 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3183 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3184 } 3185 3186 // Save current thread state and restore it at the end of this block. 3187 // And set new thread state to SLEEPING. 3188 JavaThreadSleepState jtss(thread); 3189 3190 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC); 3191 3192 if (nanos == 0) { 3193 os::naked_yield(); 3194 } else { 3195 ThreadState old_state = thread->osthread()->get_state(); 3196 thread->osthread()->set_state(SLEEPING); 3197 if (!thread->sleep_nanos(nanos)) { // interrupted 3198 // An asynchronous exception could have been thrown on 3199 // us while we were sleeping. We do not overwrite those. 3200 if (!HAS_PENDING_EXCEPTION) { 3201 HOTSPOT_THREAD_SLEEP_END(1); 3202 3203 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3204 // to properly restore the thread state. That's likely wrong. 3205 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3206 } 3207 } 3208 thread->osthread()->set_state(old_state); 3209 } 3210 HOTSPOT_THREAD_SLEEP_END(0); 3211 JVM_END 3212 3213 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3214 oop jthread = thread->threadObj(); 3215 assert(jthread != nullptr, "no current carrier thread!"); 3216 return JNIHandles::make_local(THREAD, jthread); 3217 JVM_END 3218 3219 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3220 oop theThread = thread->vthread(); 3221 assert(theThread != (oop)nullptr, "no current thread!"); 3222 return JNIHandles::make_local(THREAD, theThread); 3223 JVM_END 3224 3225 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3226 jobject theThread)) 3227 oop threadObj = JNIHandles::resolve(theThread); 3228 thread->set_vthread(threadObj); 3229 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3230 JVM_END 3231 3232 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3233 return ThreadIdentifier::unsafe_offset(); 3234 JVM_END 3235 3236 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3237 ThreadsListHandle tlh(thread); 3238 JavaThread* receiver = nullptr; 3239 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3240 if (is_alive) { 3241 // jthread refers to a live JavaThread. 3242 receiver->interrupt(); 3243 } 3244 JVM_END 3245 3246 // Return true iff the current thread has locked the object passed in 3247 3248 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3249 if (obj == nullptr) { 3250 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3251 } 3252 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3253 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3254 JVM_END 3255 3256 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3257 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD); 3258 return JNIHandles::make_local(THREAD, trace); 3259 JVM_END 3260 3261 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3262 VM_PrintThreads op; 3263 VMThread::execute(&op); 3264 if (JvmtiExport::should_post_data_dump()) { 3265 JvmtiExport::post_data_dump(); 3266 } 3267 JVM_END 3268 3269 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3270 // We don't use a ThreadsListHandle here because the current thread 3271 // must be alive. 3272 oop java_thread = JNIHandles::resolve_non_null(jthread); 3273 JavaThread* thr = java_lang_Thread::thread(java_thread); 3274 if (thread == thr && !thr->has_attached_via_jni()) { 3275 // Thread naming is only supported for the current thread and 3276 // we don't set the name of an attached thread to avoid stepping 3277 // on other programs. 3278 ResourceMark rm(thread); 3279 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3280 os::set_native_thread_name(thread_name); 3281 } 3282 JVM_END 3283 3284 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3285 oop theCache = thread->scopedValueCache(); 3286 return JNIHandles::make_local(THREAD, theCache); 3287 JVM_END 3288 3289 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3290 jobject theCache)) 3291 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3292 thread->set_scopedValueCache(objs); 3293 JVM_END 3294 3295 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3296 3297 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3298 ResourceMark rm(THREAD); 3299 JvmtiVMObjectAllocEventCollector oam; 3300 vframeStream vfst(thread); 3301 3302 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) { 3303 // This must only be called from SecurityManager.getClassContext 3304 Method* m = vfst.method(); 3305 if (!(m->method_holder() == vmClasses::SecurityManager_klass() && 3306 m->name() == vmSymbols::getClassContext_name() && 3307 m->signature() == vmSymbols::void_class_array_signature())) { 3308 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3309 } 3310 } 3311 3312 // Collect method holders 3313 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3314 for (; !vfst.at_end(); vfst.security_next()) { 3315 Method* m = vfst.method(); 3316 // Native frames are not returned 3317 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3318 Klass* holder = m->method_holder(); 3319 assert(holder->is_klass(), "just checking"); 3320 klass_array->append(holder); 3321 } 3322 } 3323 3324 // Create result array of type [Ljava/lang/Class; 3325 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL); 3326 // Fill in mirrors corresponding to method holders 3327 for (int i = 0; i < klass_array->length(); i++) { 3328 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3329 } 3330 3331 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3332 JVM_END 3333 3334 3335 // java.lang.Package //////////////////////////////////////////////////////////////// 3336 3337 3338 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3339 ResourceMark rm(THREAD); 3340 JvmtiVMObjectAllocEventCollector oam; 3341 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3342 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3343 return (jstring) JNIHandles::make_local(THREAD, result); 3344 JVM_END 3345 3346 3347 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3348 JvmtiVMObjectAllocEventCollector oam; 3349 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3350 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3351 JVM_END 3352 3353 3354 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3355 3356 3357 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3358 MonitorLocker ml(Heap_lock); 3359 oop ref = Universe::reference_pending_list(); 3360 if (ref != nullptr) { 3361 Universe::clear_reference_pending_list(); 3362 } 3363 return JNIHandles::make_local(THREAD, ref); 3364 JVM_END 3365 3366 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3367 MonitorLocker ml(Heap_lock); 3368 return Universe::has_reference_pending_list(); 3369 JVM_END 3370 3371 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3372 MonitorLocker ml(Heap_lock); 3373 while (!Universe::has_reference_pending_list()) { 3374 ml.wait(); 3375 } 3376 JVM_END 3377 3378 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3379 oop ref_oop = JNIHandles::resolve_non_null(ref); 3380 // PhantomReference has it's own implementation of refersTo(). 3381 // See: JVM_PhantomReferenceRefersTo 3382 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3383 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3384 return referent == JNIHandles::resolve(o); 3385 JVM_END 3386 3387 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3388 oop ref_oop = JNIHandles::resolve_non_null(ref); 3389 // FinalReference has it's own implementation of clear(). 3390 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3391 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3392 // If the referent has already been cleared then done. 3393 // However, if the referent is dead but has not yet been cleared by 3394 // concurrent reference processing, it should NOT be cleared here. 3395 // Instead, clearing should be left to the GC. Clearing it here could 3396 // detectably lose an expected notification, which is impossible with 3397 // STW reference processing. The clearing in enqueue() doesn't have 3398 // this problem, since the enqueue covers the notification, but it's not 3399 // worth the effort to handle that case specially. 3400 return; 3401 } 3402 java_lang_ref_Reference::clear_referent(ref_oop); 3403 JVM_END 3404 3405 3406 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3407 3408 3409 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3410 oop ref_oop = JNIHandles::resolve_non_null(ref); 3411 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3412 return referent == JNIHandles::resolve(o); 3413 JVM_END 3414 3415 3416 // ObjectInputStream /////////////////////////////////////////////////////////////// 3417 3418 // Return the first user-defined class loader up the execution stack, or null 3419 // if only code from the bootstrap or platform class loader is on the stack. 3420 3421 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3422 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3423 InstanceKlass* ik = vfst.method()->method_holder(); 3424 oop loader = ik->class_loader(); 3425 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3426 // Skip reflection related frames 3427 if (!ik->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) { 3428 return JNIHandles::make_local(THREAD, loader); 3429 } 3430 } 3431 } 3432 return nullptr; 3433 JVM_END 3434 3435 3436 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3437 3438 3439 // resolve array handle and check arguments 3440 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3441 if (arr == nullptr) { 3442 THROW_0(vmSymbols::java_lang_NullPointerException()); 3443 } 3444 oop a = JNIHandles::resolve_non_null(arr); 3445 if (!a->is_array()) { 3446 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3447 } else if (type_array_only && !a->is_typeArray()) { 3448 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3449 } 3450 return arrayOop(a); 3451 } 3452 3453 3454 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3455 arrayOop a = check_array(env, arr, false, CHECK_0); 3456 return a->length(); 3457 JVM_END 3458 3459 3460 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3461 JvmtiVMObjectAllocEventCollector oam; 3462 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3463 jvalue value; 3464 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3465 oop box = Reflection::box(&value, type, CHECK_NULL); 3466 return JNIHandles::make_local(THREAD, box); 3467 JVM_END 3468 3469 3470 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3471 jvalue value; 3472 value.i = 0; // to initialize value before getting used in CHECK 3473 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3474 assert(a->is_typeArray(), "just checking"); 3475 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3476 BasicType wide_type = (BasicType) wCode; 3477 if (type != wide_type) { 3478 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3479 } 3480 return value; 3481 JVM_END 3482 3483 3484 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3485 arrayOop a = check_array(env, arr, false, CHECK); 3486 oop box = JNIHandles::resolve(val); 3487 jvalue value; 3488 value.i = 0; // to initialize value before getting used in CHECK 3489 BasicType value_type; 3490 if (a->is_objArray()) { 3491 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3492 value_type = Reflection::unbox_for_regular_object(box, &value); 3493 } else { 3494 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3495 } 3496 Reflection::array_set(&value, a, index, value_type, CHECK); 3497 JVM_END 3498 3499 3500 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3501 arrayOop a = check_array(env, arr, true, CHECK); 3502 assert(a->is_typeArray(), "just checking"); 3503 BasicType value_type = (BasicType) vCode; 3504 Reflection::array_set(&v, a, index, value_type, CHECK); 3505 JVM_END 3506 3507 3508 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3509 JvmtiVMObjectAllocEventCollector oam; 3510 oop element_mirror = JNIHandles::resolve(eltClass); 3511 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3512 return JNIHandles::make_local(THREAD, result); 3513 JVM_END 3514 3515 3516 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3517 JvmtiVMObjectAllocEventCollector oam; 3518 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3519 oop element_mirror = JNIHandles::resolve(eltClass); 3520 assert(dim_array->is_typeArray(), "just checking"); 3521 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3522 return JNIHandles::make_local(THREAD, result); 3523 JVM_END 3524 3525 3526 // Library support /////////////////////////////////////////////////////////////////////////// 3527 3528 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3529 return ZipLibrary::handle(); 3530 JVM_END 3531 3532 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3533 //%note jvm_ct 3534 char ebuf[1024]; 3535 void *load_result; 3536 { 3537 ThreadToNativeFromVM ttnfvm(thread); 3538 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3539 } 3540 if (load_result == nullptr) { 3541 if (throwException) { 3542 char msg[1024]; 3543 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3544 // Since 'ebuf' may contain a string encoded using 3545 // platform encoding scheme, we need to pass 3546 // Exceptions::unsafe_to_utf8 to the new_exception method 3547 // as the last argument. See bug 6367357. 3548 Handle h_exception = 3549 Exceptions::new_exception(thread, 3550 vmSymbols::java_lang_UnsatisfiedLinkError(), 3551 msg, Exceptions::unsafe_to_utf8); 3552 3553 THROW_HANDLE_0(h_exception); 3554 } else { 3555 log_info(library)("Failed to load library %s", name); 3556 return load_result; 3557 } 3558 } 3559 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3560 return load_result; 3561 JVM_END 3562 3563 3564 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3565 os::dll_unload(handle); 3566 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3567 JVM_END 3568 3569 3570 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3571 void* find_result = os::dll_lookup(handle, name); 3572 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3573 find_result != nullptr ? "Found" : "Failed to find", 3574 name, p2i(handle)); 3575 return find_result; 3576 JVM_END 3577 3578 3579 // JNI version /////////////////////////////////////////////////////////////////////////////// 3580 3581 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3582 return Threads::is_supported_jni_version_including_1_1(version); 3583 JVM_END 3584 3585 3586 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3587 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3588 JVM_END 3589 3590 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void)) 3591 return EnableValhalla ? JNI_TRUE : JNI_FALSE; 3592 JVM_END 3593 3594 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3595 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3596 JVM_END 3597 3598 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void)) 3599 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE; 3600 JVM_END 3601 3602 // String support /////////////////////////////////////////////////////////////////////////// 3603 3604 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3605 JvmtiVMObjectAllocEventCollector oam; 3606 if (str == nullptr) return nullptr; 3607 oop string = JNIHandles::resolve_non_null(str); 3608 oop result = StringTable::intern(string, CHECK_NULL); 3609 return (jstring) JNIHandles::make_local(THREAD, result); 3610 JVM_END 3611 3612 3613 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3614 3615 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3616 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3617 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3618 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3619 // nature. JavaThreads will be "in native" when using this API from JDK code. 3620 3621 3622 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3623 VM_Exit::block_if_vm_exited(); 3624 return new PlatformMutex(); 3625 } 3626 3627 3628 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3629 VM_Exit::block_if_vm_exited(); 3630 delete ((PlatformMutex*) mon); 3631 } 3632 3633 3634 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3635 VM_Exit::block_if_vm_exited(); 3636 ((PlatformMutex*) mon)->lock(); 3637 return 0; 3638 } 3639 3640 3641 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3642 VM_Exit::block_if_vm_exited(); 3643 ((PlatformMutex*) mon)->unlock(); 3644 } 3645 3646 3647 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3648 3649 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3650 Handle loader, Handle protection_domain, 3651 jboolean throwError, TRAPS) { 3652 // Security Note: 3653 // The Java level wrapper will perform the necessary security check allowing 3654 // us to pass the null as the initiating class loader. The VM is responsible for 3655 // the checkPackageAccess relative to the initiating class loader via the 3656 // protection_domain. The protection_domain is passed as null by the java code 3657 // if there is no security manager in 3-arg Class.forName(). 3658 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3659 3660 // Check if we should initialize the class 3661 if (init && klass->is_instance_klass()) { 3662 klass->initialize(CHECK_NULL); 3663 } 3664 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3665 } 3666 3667 3668 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3669 3670 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3671 Handle method_handle; 3672 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3673 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3674 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3675 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL); 3676 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3677 jobject res = JNIHandles::make_local(THREAD, result); 3678 if (JvmtiExport::should_post_vm_object_alloc()) { 3679 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3680 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3681 if (java_lang_Class::is_primitive(ret_type)) { 3682 // Only for primitive type vm allocates memory for java object. 3683 // See box() method. 3684 JvmtiExport::post_vm_object_alloc(thread, result); 3685 } 3686 } 3687 return res; 3688 } else { 3689 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3690 } 3691 JVM_END 3692 3693 3694 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3695 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL); 3696 oop constructor_mirror = JNIHandles::resolve(c); 3697 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3698 jobject res = JNIHandles::make_local(THREAD, result); 3699 if (JvmtiExport::should_post_vm_object_alloc()) { 3700 JvmtiExport::post_vm_object_alloc(thread, result); 3701 } 3702 return res; 3703 JVM_END 3704 3705 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3706 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3707 assert(k->is_klass(), "just checking"); 3708 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3709 JVM_END 3710 3711 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3712 jclass caller, 3713 jstring interfaceMethodName, 3714 jobject factoryType, 3715 jobject interfaceMethodType, 3716 jobject implementationMember, 3717 jobject dynamicMethodType, 3718 jclass lambdaProxyClass)) 3719 #if INCLUDE_CDS 3720 if (!CDSConfig::is_dumping_archive()) { 3721 return; 3722 } 3723 3724 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3725 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3726 if (caller_ik->is_hidden()) { 3727 // Hidden classes not of type lambda proxy classes are currently not being archived. 3728 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3729 // registered for archiving. 3730 return; 3731 } 3732 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass)); 3733 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k); 3734 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3735 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3736 3737 Symbol* interface_method_name = nullptr; 3738 if (interfaceMethodName != nullptr) { 3739 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3740 } 3741 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3742 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3743 3744 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3745 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3746 3747 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3748 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3749 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3750 3751 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3752 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3753 3754 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3755 interface_method_type, m, dynamic_method_type, THREAD); 3756 #endif // INCLUDE_CDS 3757 JVM_END 3758 3759 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3760 jclass caller, 3761 jstring interfaceMethodName, 3762 jobject factoryType, 3763 jobject interfaceMethodType, 3764 jobject implementationMember, 3765 jobject dynamicMethodType)) 3766 #if INCLUDE_CDS 3767 3768 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3769 implementationMember == nullptr || dynamicMethodType == nullptr) { 3770 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3771 } 3772 3773 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3774 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3775 if (!caller_ik->is_shared()) { 3776 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3777 return nullptr; 3778 } 3779 3780 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3781 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3782 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3783 3784 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3785 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3786 3787 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3788 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3789 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3790 3791 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3792 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3793 3794 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3795 interface_method_type, m, dynamic_method_type); 3796 jclass jcls = nullptr; 3797 if (lambda_ik != nullptr) { 3798 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD); 3799 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3800 } 3801 return jcls; 3802 #else 3803 return nullptr; 3804 #endif // INCLUDE_CDS 3805 JVM_END 3806 3807 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3808 if (CDSConfig::is_dumping_static_archive()) { 3809 // We do this so that the default CDS archive can be deterministic. 3810 const char* release = VM_Version::vm_release(); 3811 const char* dbg_level = VM_Version::jdk_debug_level(); 3812 const char* version = VM_Version::internal_vm_info_string(); 3813 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3814 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3815 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3816 seed += (jlong)VM_Version::vm_major_version(); 3817 seed += (jlong)VM_Version::vm_minor_version(); 3818 seed += (jlong)VM_Version::vm_security_version(); 3819 seed += (jlong)VM_Version::vm_patch_version(); 3820 if (seed == 0) { // don't let this ever be zero. 3821 seed = 0x87654321; 3822 } 3823 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3824 return seed; 3825 } else { 3826 return 0; 3827 } 3828 JVM_END 3829 3830 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus()) 3831 return CDSConfig::get_status(); 3832 JVM_END 3833 3834 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3835 #if INCLUDE_CDS 3836 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity"); 3837 if (line != nullptr) { 3838 ResourceMark rm(THREAD); 3839 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3840 char* c_line = java_lang_String::as_utf8_string(h_line()); 3841 if (CDSConfig::is_dumping_dynamic_archive()) { 3842 // Note: LambdaFormInvokers::append take same format which is not 3843 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3844 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3845 } 3846 if (ClassListWriter::is_enabled()) { 3847 ClassListWriter w; 3848 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line); 3849 } 3850 } 3851 #endif // INCLUDE_CDS 3852 JVM_END 3853 3854 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3855 #if INCLUDE_CDS 3856 ResourceMark rm(THREAD); 3857 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3858 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3859 MetaspaceShared::dump_loaded_classes(file_name, THREAD); 3860 #endif // INCLUDE_CDS 3861 JVM_END 3862 3863 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3864 #if INCLUDE_CDS 3865 ResourceMark rm(THREAD); 3866 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3867 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3868 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3869 #endif // INCLUDE_CDS 3870 JVM_END 3871 3872 // Returns an array of all live Thread objects (VM internal JavaThreads, 3873 // jvmti agent threads, and JNI attaching threads are skipped) 3874 // See CR 6404306 regarding JNI attaching threads 3875 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3876 ResourceMark rm(THREAD); 3877 ThreadsListEnumerator tle(THREAD, false, false); 3878 JvmtiVMObjectAllocEventCollector oam; 3879 3880 int num_threads = tle.num_threads(); 3881 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3882 objArrayHandle threads_ah(THREAD, r); 3883 3884 for (int i = 0; i < num_threads; i++) { 3885 Handle h = tle.get_threadObj(i); 3886 threads_ah->obj_at_put(i, h()); 3887 } 3888 3889 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3890 JVM_END 3891 3892 3893 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3894 // Return StackTraceElement[][], each element is the stack trace of a thread in 3895 // the corresponding entry in the given threads array 3896 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3897 JvmtiVMObjectAllocEventCollector oam; 3898 3899 // Check if threads is null 3900 if (threads == nullptr) { 3901 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3902 } 3903 3904 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3905 objArrayHandle ah(THREAD, a); 3906 int num_threads = ah->length(); 3907 // check if threads is non-empty array 3908 if (num_threads == 0) { 3909 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3910 } 3911 3912 // check if threads is not an array of objects of Thread class 3913 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3914 if (k != vmClasses::Thread_klass()) { 3915 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3916 } 3917 3918 ResourceMark rm(THREAD); 3919 3920 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3921 for (int i = 0; i < num_threads; i++) { 3922 oop thread_obj = ah->obj_at(i); 3923 instanceHandle h(THREAD, (instanceOop) thread_obj); 3924 thread_handle_array->append(h); 3925 } 3926 3927 // The JavaThread references in thread_handle_array are validated 3928 // in VM_ThreadDump::doit(). 3929 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3930 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3931 3932 JVM_END 3933 3934 // JVM monitoring and management support 3935 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3936 return Management::get_jmm_interface(version); 3937 JVM_END 3938 3939 // com.sun.tools.attach.VirtualMachine agent properties support 3940 // 3941 // Initialize the agent properties with the properties maintained in the VM 3942 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3943 ResourceMark rm; 3944 3945 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3946 3947 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3948 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3949 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3950 return properties; 3951 JVM_END 3952 3953 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3954 { 3955 JvmtiVMObjectAllocEventCollector oam; 3956 3957 if (ofClass == nullptr) { 3958 return nullptr; 3959 } 3960 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3961 // Special handling for primitive objects 3962 if (java_lang_Class::is_primitive(mirror())) { 3963 return nullptr; 3964 } 3965 Klass* k = java_lang_Class::as_Klass(mirror()); 3966 if (!k->is_instance_klass()) { 3967 return nullptr; 3968 } 3969 InstanceKlass* ik = InstanceKlass::cast(k); 3970 int encl_method_class_idx = ik->enclosing_method_class_index(); 3971 if (encl_method_class_idx == 0) { 3972 return nullptr; 3973 } 3974 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3975 objArrayHandle dest(THREAD, dest_o); 3976 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3977 dest->obj_at_put(0, enc_k->java_mirror()); 3978 int encl_method_method_idx = ik->enclosing_method_method_index(); 3979 if (encl_method_method_idx != 0) { 3980 Symbol* sym = ik->constants()->symbol_at( 3981 extract_low_short_from_int( 3982 ik->constants()->name_and_type_at(encl_method_method_idx))); 3983 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3984 dest->obj_at_put(1, str()); 3985 sym = ik->constants()->symbol_at( 3986 extract_high_short_from_int( 3987 ik->constants()->name_and_type_at(encl_method_method_idx))); 3988 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3989 dest->obj_at_put(2, str()); 3990 } 3991 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3992 } 3993 JVM_END 3994 3995 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3996 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3997 ResourceMark rm(THREAD); 3998 3999 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 4000 return nullptr; 4001 } 4002 4003 char** vm_flags = Arguments::jvm_flags_array(); 4004 char** vm_args = Arguments::jvm_args_array(); 4005 int num_flags = Arguments::num_jvm_flags(); 4006 int num_args = Arguments::num_jvm_args(); 4007 4008 InstanceKlass* ik = vmClasses::String_klass(); 4009 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 4010 objArrayHandle result_h(THREAD, r); 4011 4012 int index = 0; 4013 for (int j = 0; j < num_flags; j++, index++) { 4014 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 4015 result_h->obj_at_put(index, h()); 4016 } 4017 for (int i = 0; i < num_args; i++, index++) { 4018 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 4019 result_h->obj_at_put(index, h()); 4020 } 4021 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 4022 JVM_END 4023 4024 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 4025 return os::get_signal_number(name); 4026 JVM_END 4027 4028 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread)) 4029 #if INCLUDE_JVMTI 4030 if (!DoJVMTIVirtualThreadTransitions) { 4031 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4032 return; 4033 } 4034 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4035 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread); 4036 } else { 4037 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4038 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false); 4039 } 4040 #endif 4041 JVM_END 4042 4043 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread)) 4044 #if INCLUDE_JVMTI 4045 if (!DoJVMTIVirtualThreadTransitions) { 4046 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4047 return; 4048 } 4049 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4050 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread); 4051 } else { 4052 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4053 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true); 4054 } 4055 #endif 4056 JVM_END 4057 4058 // If notifications are disabled then just update the VTMS transition bit and return. 4059 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call. 4060 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide)) 4061 #if INCLUDE_JVMTI 4062 if (!DoJVMTIVirtualThreadTransitions) { 4063 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4064 return; 4065 } 4066 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4067 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide); 4068 } else { 4069 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4070 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 4071 } 4072 #endif 4073 JVM_END 4074 4075 // If notifications are disabled then just update the VTMS transition bit and return. 4076 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below. 4077 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide)) 4078 #if INCLUDE_JVMTI 4079 if (!DoJVMTIVirtualThreadTransitions) { 4080 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4081 return; 4082 } 4083 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4084 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide); 4085 } else { 4086 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4087 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 4088 } 4089 #endif 4090 JVM_END 4091 4092 // Always update the temporary VTMS transition bit. 4093 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jclass clazz, jboolean hide)) 4094 #if INCLUDE_JVMTI 4095 if (!DoJVMTIVirtualThreadTransitions) { 4096 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4097 return; 4098 } 4099 assert(!thread->is_in_VTMS_transition(), "sanity check"); 4100 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check"); 4101 thread->toggle_is_in_tmp_VTMS_transition(); 4102 #endif 4103 JVM_END 4104 4105 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section. 4106 // Needed to avoid deadlocks with JVMTI suspend mechanism. 4107 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter)) 4108 #if INCLUDE_JVMTI 4109 if (!DoJVMTIVirtualThreadTransitions) { 4110 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4111 return; 4112 } 4113 assert(thread->is_disable_suspend() != (bool)enter, 4114 "nested or unbalanced monitor enter/exit is not allowed"); 4115 thread->toggle_is_disable_suspend(); 4116 #endif 4117 JVM_END 4118 4119 /* 4120 * Return the current class's class file version. The low order 16 bits of the 4121 * returned jint contain the class's major version. The high order 16 bits 4122 * contain the class's minor version. 4123 */ 4124 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 4125 oop mirror = JNIHandles::resolve_non_null(current); 4126 if (java_lang_Class::is_primitive(mirror)) { 4127 // return latest major version and minor version of 0. 4128 return JVM_CLASSFILE_MAJOR_VERSION; 4129 } 4130 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class"); 4131 4132 Klass* c = java_lang_Class::as_Klass(mirror); 4133 assert(c->is_instance_klass(), "must be"); 4134 InstanceKlass* ik = InstanceKlass::cast(c); 4135 return (ik->minor_version() << 16) | ik->major_version(); 4136 JVM_END 4137 4138 /* 4139 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 4140 * get the value will see a materialized value and not a scalar-replaced 4141 * null value. 4142 */ 4143 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 4144 JVM_EnsureMaterializedForStackWalk(env, value); 4145 JVM_END 4146 4147 /* 4148 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded. 4149 */ 4150 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void)) 4151 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE; 4152 JVM_END