1 /* 2 * Copyright (c) 1997, 2023, 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 annotated with @ImplicitlyConstructible"); 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_inline_klass() || 724 (klass->is_instance_klass() && 725 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 726 ResourceMark rm(THREAD); 727 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 728 } 729 730 // Make shallow object copy 731 const size_t size = obj->size(); 732 oop new_obj_oop = nullptr; 733 if (obj->is_array()) { 734 const int length = ((arrayOop)obj())->length(); 735 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 736 /* do_zero */ true, CHECK_NULL); 737 } else { 738 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 739 } 740 741 HeapAccess<>::clone(obj(), new_obj_oop, size); 742 743 Handle new_obj(THREAD, new_obj_oop); 744 // Caution: this involves a java upcall, so the clone should be 745 // "gc-robust" by this stage. 746 if (klass->has_finalizer()) { 747 assert(obj->is_instance(), "should be instanceOop"); 748 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 749 new_obj = Handle(THREAD, new_obj_oop); 750 } 751 752 return JNIHandles::make_local(THREAD, new_obj()); 753 JVM_END 754 755 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 756 757 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 758 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 759 JVM_END 760 761 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 762 return InstanceKlass::is_finalization_enabled(); 763 JVM_END 764 765 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 766 767 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 768 CONT_RegisterNativeMethods(env, cls); 769 JVM_END 770 771 // java.io.File /////////////////////////////////////////////////////////////// 772 773 JVM_LEAF(char*, JVM_NativePath(char* path)) 774 return os::native_path(path); 775 JVM_END 776 777 778 // Misc. class handling /////////////////////////////////////////////////////////// 779 780 781 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 782 // Getting the class of the caller frame. 783 // 784 // The call stack at this point looks something like this: 785 // 786 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ] 787 // [1] [ @CallerSensitive API.method ] 788 // [.] [ (skipped intermediate frames) ] 789 // [n] [ caller ] 790 vframeStream vfst(thread); 791 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 792 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 793 Method* m = vfst.method(); 794 assert(m != nullptr, "sanity"); 795 switch (n) { 796 case 0: 797 // This must only be called from Reflection.getCallerClass 798 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 799 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 800 } 801 // fall-through 802 case 1: 803 // Frame 0 and 1 must be caller sensitive. 804 if (!m->caller_sensitive()) { 805 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 806 } 807 break; 808 default: 809 if (!m->is_ignored_by_security_stack_walk()) { 810 // We have reached the desired frame; return the holder class. 811 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 812 } 813 break; 814 } 815 } 816 return nullptr; 817 JVM_END 818 819 820 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 821 oop mirror = nullptr; 822 BasicType t = name2type(utf); 823 if (t != T_ILLEGAL && !is_reference_type(t)) { 824 mirror = Universe::java_mirror(t); 825 } 826 if (mirror == nullptr) { 827 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 828 } else { 829 return (jclass) JNIHandles::make_local(THREAD, mirror); 830 } 831 JVM_END 832 833 834 // Returns a class loaded by the bootstrap class loader; or null 835 // if not found. ClassNotFoundException is not thrown. 836 // FindClassFromBootLoader is exported to the launcher for windows. 837 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 838 const char* name)) 839 // Java libraries should ensure that name is never null or illegal. 840 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 841 // It's impossible to create this class; the name cannot fit 842 // into the constant pool. 843 return nullptr; 844 } 845 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name"); 846 847 TempNewSymbol h_name = SymbolTable::new_symbol(name); 848 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 849 if (k == nullptr) { 850 return nullptr; 851 } 852 853 if (log_is_enabled(Debug, class, resolve)) { 854 trace_class_resolution(k); 855 } 856 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 857 JVM_END 858 859 // Find a class with this name in this loader, using the caller's protection domain. 860 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 861 jboolean init, jobject loader, 862 jclass caller)) 863 TempNewSymbol h_name = 864 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 865 CHECK_NULL); 866 867 oop loader_oop = JNIHandles::resolve(loader); 868 oop from_class = JNIHandles::resolve(caller); 869 oop protection_domain = nullptr; 870 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 871 // NPE. Put it in another way, the bootstrap class loader has all permission and 872 // thus no checkPackageAccess equivalence in the VM class loader. 873 // The caller is also passed as null by the java code if there is no security 874 // manager to avoid the performance cost of getting the calling class. 875 if (from_class != nullptr && loader_oop != nullptr) { 876 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 877 } 878 879 Handle h_loader(THREAD, loader_oop); 880 Handle h_prot(THREAD, protection_domain); 881 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 882 h_prot, false, THREAD); 883 884 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 885 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 886 } 887 return result; 888 JVM_END 889 890 // Currently only called from the old verifier. 891 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 892 jboolean init, jclass from)) 893 TempNewSymbol h_name = 894 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 895 CHECK_NULL); 896 oop from_class_oop = JNIHandles::resolve(from); 897 Klass* from_class = (from_class_oop == nullptr) 898 ? (Klass*)nullptr 899 : java_lang_Class::as_Klass(from_class_oop); 900 oop class_loader = nullptr; 901 oop protection_domain = nullptr; 902 if (from_class != nullptr) { 903 class_loader = from_class->class_loader(); 904 protection_domain = from_class->protection_domain(); 905 } 906 Handle h_loader(THREAD, class_loader); 907 Handle h_prot (THREAD, protection_domain); 908 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 909 h_prot, true, thread); 910 911 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 912 // this function is generally only used for class loading during verification. 913 ResourceMark rm; 914 oop from_mirror = JNIHandles::resolve_non_null(from); 915 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 916 const char * from_name = from_class->external_name(); 917 918 oop mirror = JNIHandles::resolve_non_null(result); 919 Klass* to_class = java_lang_Class::as_Klass(mirror); 920 const char * to = to_class->external_name(); 921 log_debug(class, resolve)("%s %s (verification)", from_name, to); 922 } 923 924 return result; 925 JVM_END 926 927 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 928 static jclass jvm_define_class_common(const char *name, 929 jobject loader, const jbyte *buf, 930 jsize len, jobject pd, const char *source, 931 TRAPS) { 932 if (source == nullptr) source = "__JVM_DefineClass__"; 933 934 JavaThread* jt = THREAD; 935 936 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 937 ClassLoader::perf_define_appclass_selftime(), 938 ClassLoader::perf_define_appclasses(), 939 jt->get_thread_stat()->perf_recursion_counts_addr(), 940 jt->get_thread_stat()->perf_timers_addr(), 941 PerfClassTraceTime::DEFINE_CLASS); 942 943 if (UsePerfData) { 944 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 945 } 946 947 // Class resolution will get the class name from the .class stream if the name is null. 948 TempNewSymbol class_name = name == nullptr ? nullptr : 949 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 950 CHECK_NULL); 951 952 ResourceMark rm(THREAD); 953 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 954 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 955 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 956 ClassLoadInfo cl_info(protection_domain); 957 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 958 class_loader, 959 cl_info, 960 CHECK_NULL); 961 962 if (log_is_enabled(Debug, class, resolve)) { 963 trace_class_resolution(k); 964 } 965 966 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 967 } 968 969 enum { 970 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 971 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 972 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 973 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 974 }; 975 976 /* 977 * Define a class with the specified flags that indicates if it's a nestmate, 978 * hidden, or strongly referenced from class loader. 979 */ 980 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 981 const jbyte *buf, jsize len, jobject pd, 982 jboolean init, int flags, jobject classData, TRAPS) { 983 ResourceMark rm(THREAD); 984 985 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup)); 986 // Lookup class must be a non-null instance 987 if (lookup_k == nullptr) { 988 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 989 } 990 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass"); 991 992 Handle class_loader (THREAD, lookup_k->class_loader()); 993 994 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 995 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 996 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 997 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 998 999 InstanceKlass* host_class = nullptr; 1000 if (is_nestmate) { 1001 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL); 1002 } 1003 1004 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1005 name, 1006 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1007 is_nestmate ? host_class->external_name() : "", 1008 is_hidden ? "hidden" : "not hidden", 1009 is_strong ? "strong" : "weak", 1010 vm_annotations ? "with vm annotations" : "without vm annotation"); 1011 1012 if (!is_hidden) { 1013 // classData is only applicable for hidden classes 1014 if (classData != nullptr) { 1015 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1016 } 1017 if (is_nestmate) { 1018 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1019 } 1020 if (!is_strong) { 1021 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1022 } 1023 if (vm_annotations) { 1024 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1025 } 1026 if (flags != STRONG_LOADER_LINK) { 1027 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1028 err_msg("invalid flag 0x%x", flags)); 1029 } 1030 } 1031 1032 // Class resolution will get the class name from the .class stream if the name is null. 1033 TempNewSymbol class_name = name == nullptr ? nullptr : 1034 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1035 CHECK_NULL); 1036 1037 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1038 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1039 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 1040 1041 InstanceKlass* ik = nullptr; 1042 if (!is_hidden) { 1043 ClassLoadInfo cl_info(protection_domain); 1044 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1045 class_loader, 1046 cl_info, 1047 CHECK_NULL); 1048 1049 if (log_is_enabled(Debug, class, resolve)) { 1050 trace_class_resolution(ik); 1051 } 1052 } else { // hidden 1053 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1054 ClassLoadInfo cl_info(protection_domain, 1055 host_class, 1056 classData_h, 1057 is_hidden, 1058 is_strong, 1059 vm_annotations); 1060 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1061 class_loader, 1062 cl_info, 1063 CHECK_NULL); 1064 1065 // The hidden class loader data has been artificially been kept alive to 1066 // this point. The mirror and any instances of this class have to keep 1067 // it alive afterwards. 1068 ik->class_loader_data()->dec_keep_alive(); 1069 1070 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1071 ModuleEntry* module = ik->module(); 1072 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1073 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1074 module_name, 1075 ik->external_name(), 1076 host_class->external_name(), 1077 ik->is_hidden() ? "is hidden" : "is not hidden"); 1078 } 1079 } 1080 1081 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) { 1082 // non-hidden class or nestmate class must be in the same package as the Lookup class 1083 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages"); 1084 } 1085 1086 if (init) { 1087 ik->initialize(CHECK_NULL); 1088 } else { 1089 ik->link_class(CHECK_NULL); 1090 } 1091 1092 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1093 } 1094 1095 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1096 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1097 JVM_END 1098 1099 /* 1100 * Define a class with the specified lookup class. 1101 * lookup: Lookup class 1102 * name: the name of the class 1103 * buf: class bytes 1104 * len: length of class bytes 1105 * pd: protection domain 1106 * init: initialize the class 1107 * flags: properties of the class 1108 * classData: private static pre-initialized field 1109 */ 1110 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1111 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1112 1113 if (lookup == nullptr) { 1114 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1115 } 1116 1117 assert(buf != nullptr, "buf must not be null"); 1118 1119 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1120 JVM_END 1121 1122 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1123 1124 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1125 JVM_END 1126 1127 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1128 ResourceMark rm(THREAD); 1129 1130 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1131 char* str = java_lang_String::as_utf8_string(h_name()); 1132 1133 // Sanity check, don't expect null 1134 if (str == nullptr) return nullptr; 1135 1136 // Internalize the string, converting '.' to '/' in string. 1137 char* p = (char*)str; 1138 while (*p != '\0') { 1139 if (*p == '.') { 1140 *p = '/'; 1141 } 1142 p++; 1143 } 1144 1145 const int str_len = (int)(p - str); 1146 if (str_len > Symbol::max_length()) { 1147 // It's impossible to create this class; the name cannot fit 1148 // into the constant pool. 1149 return nullptr; 1150 } 1151 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1152 1153 // Security Note: 1154 // The Java level wrapper will perform the necessary security check allowing 1155 // us to pass the null as the initiating class loader. 1156 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1157 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, 1158 h_loader, 1159 Handle()); 1160 #if INCLUDE_CDS 1161 if (k == nullptr) { 1162 // If the class is not already loaded, try to see if it's in the shared 1163 // archive for the current classloader (h_loader). 1164 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1165 } 1166 #endif 1167 return (k == nullptr) ? nullptr : 1168 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1169 JVM_END 1170 1171 // Module support ////////////////////////////////////////////////////////////////////////////// 1172 1173 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1174 jstring location, jobjectArray packages)) 1175 Handle h_module (THREAD, JNIHandles::resolve(module)); 1176 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1177 JVM_END 1178 1179 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1180 Handle h_module (THREAD, JNIHandles::resolve(module)); 1181 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1182 JVM_END 1183 1184 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1185 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1186 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1187 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1188 JVM_END 1189 1190 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1191 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1192 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1193 JVM_END 1194 1195 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1196 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1197 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1198 JVM_END 1199 1200 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1201 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1202 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1203 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1204 JVM_END 1205 1206 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1207 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1208 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1209 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1210 JVM_END 1211 1212 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1213 1214 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1215 assert (cls != nullptr, "illegal class"); 1216 JvmtiVMObjectAllocEventCollector oam; 1217 ResourceMark rm(THREAD); 1218 HandleMark hm(THREAD); 1219 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1220 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1221 return (jstring) JNIHandles::make_local(THREAD, result); 1222 JVM_END 1223 1224 1225 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1226 JvmtiVMObjectAllocEventCollector oam; 1227 oop mirror = JNIHandles::resolve_non_null(cls); 1228 1229 // Special handling for primitive objects 1230 if (java_lang_Class::is_primitive(mirror)) { 1231 // Primitive objects does not have any interfaces 1232 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1233 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1234 } 1235 1236 Klass* klass = java_lang_Class::as_Klass(mirror); 1237 // Figure size of result array 1238 int size; 1239 if (klass->is_instance_klass()) { 1240 InstanceKlass* ik = InstanceKlass::cast(klass); 1241 size = ik->local_interfaces()->length(); 1242 } else { 1243 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass"); 1244 size = 2; 1245 } 1246 1247 // Allocate result array 1248 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1249 objArrayHandle result (THREAD, r); 1250 // Fill in result 1251 if (klass->is_instance_klass()) { 1252 // Regular instance klass, fill in all local interfaces 1253 for (int index = 0; index < size; index++) { 1254 InstanceKlass* ik = InstanceKlass::cast(klass); 1255 Klass* k = ik->local_interfaces()->at(index); 1256 result->obj_at_put(index, k->java_mirror()); 1257 } 1258 } else { 1259 // All arrays implement java.lang.Cloneable and java.io.Serializable 1260 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1261 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1262 } 1263 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1264 JVM_END 1265 1266 1267 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1268 oop mirror = JNIHandles::resolve_non_null(cls); 1269 if (java_lang_Class::is_primitive(mirror)) { 1270 return JNI_FALSE; 1271 } 1272 Klass* k = java_lang_Class::as_Klass(mirror); 1273 jboolean result = k->is_interface(); 1274 assert(!result || k->is_instance_klass(), 1275 "all interfaces are instance types"); 1276 // The compiler intrinsic for isInterface tests the 1277 // Klass::_access_flags bits in the same way. 1278 return result; 1279 JVM_END 1280 1281 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1282 oop mirror = JNIHandles::resolve_non_null(cls); 1283 if (java_lang_Class::is_primitive(mirror)) { 1284 return JNI_FALSE; 1285 } 1286 Klass* k = java_lang_Class::as_Klass(mirror); 1287 return k->is_hidden(); 1288 JVM_END 1289 1290 JVM_ENTRY(jboolean, JVM_IsIdentityClass(JNIEnv *env, jclass cls)) 1291 oop mirror = JNIHandles::resolve_non_null(cls); 1292 if (java_lang_Class::is_primitive(mirror)) { 1293 return JNI_FALSE; 1294 } 1295 Klass* k = java_lang_Class::as_Klass(mirror); 1296 if (EnableValhalla) { 1297 return k->is_array_klass() || k->is_identity_class(); 1298 } else { 1299 return k->is_interface() ? JNI_FALSE : JNI_TRUE; 1300 } 1301 JVM_END 1302 1303 JVM_ENTRY(jboolean, JVM_IsImplicitlyConstructibleClass(JNIEnv *env, jclass cls)) 1304 oop mirror = JNIHandles::resolve_non_null(cls); 1305 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1306 return ik->is_implicitly_constructible(); 1307 JVM_END 1308 1309 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1310 JvmtiVMObjectAllocEventCollector oam; 1311 oop mirror = JNIHandles::resolve_non_null(cls); 1312 if (java_lang_Class::is_primitive(mirror)) { 1313 // There are no signers for primitive types 1314 return nullptr; 1315 } 1316 1317 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror)); 1318 1319 // If there are no signers set in the class, or if the class 1320 // is an array, return null. 1321 if (signers == nullptr) return nullptr; 1322 1323 // copy of the signers array 1324 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1325 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1326 for (int index = 0; index < signers->length(); index++) { 1327 signers_copy->obj_at_put(index, signers->obj_at(index)); 1328 } 1329 1330 // return the copy 1331 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy); 1332 JVM_END 1333 1334 1335 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1336 oop mirror = JNIHandles::resolve_non_null(cls); 1337 if (!java_lang_Class::is_primitive(mirror)) { 1338 // This call is ignored for primitive types and arrays. 1339 // Signers are only set once, ClassLoader.java, and thus shouldn't 1340 // be called with an array. Only the bootstrap loader creates arrays. 1341 Klass* k = java_lang_Class::as_Klass(mirror); 1342 if (k->is_instance_klass()) { 1343 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1344 } 1345 } 1346 JVM_END 1347 1348 1349 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1350 oop mirror = JNIHandles::resolve_non_null(cls); 1351 if (mirror == nullptr) { 1352 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 1353 } 1354 1355 if (java_lang_Class::is_primitive(mirror)) { 1356 // Primitive types does not have a protection domain. 1357 return nullptr; 1358 } 1359 1360 oop pd = java_lang_Class::protection_domain(mirror); 1361 return (jobject) JNIHandles::make_local(THREAD, pd); 1362 JVM_END 1363 1364 1365 // Returns the inherited_access_control_context field of the running thread. 1366 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1367 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1368 return JNIHandles::make_local(THREAD, result); 1369 JVM_END 1370 1371 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1372 if (!UsePrivilegedStack) return nullptr; 1373 1374 ResourceMark rm(THREAD); 1375 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1376 JvmtiVMObjectAllocEventCollector oam; 1377 1378 // count the protection domains on the execution stack. We collapse 1379 // duplicate consecutive protection domains into a single one, as 1380 // well as stopping when we hit a privileged frame. 1381 1382 oop previous_protection_domain = nullptr; 1383 Handle privileged_context(thread, nullptr); 1384 bool is_privileged = false; 1385 oop protection_domain = nullptr; 1386 1387 // Iterate through Java frames 1388 vframeStream vfst(thread); 1389 for(; !vfst.at_end(); vfst.next()) { 1390 // get method of frame 1391 Method* method = vfst.method(); 1392 1393 // stop at the first privileged frame 1394 if (method->method_holder() == vmClasses::AccessController_klass() && 1395 method->name() == vmSymbols::executePrivileged_name()) 1396 { 1397 // this frame is privileged 1398 is_privileged = true; 1399 1400 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1401 1402 StackValueCollection* locals = priv->locals(); 1403 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1404 StackValue* clr_sv = locals->at(2); // Class<?> caller 1405 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1406 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1407 privileged_context = ctx_sv->get_obj(); 1408 Handle caller = clr_sv->get_obj(); 1409 1410 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1411 protection_domain = caller_klass->protection_domain(); 1412 } else { 1413 protection_domain = method->method_holder()->protection_domain(); 1414 } 1415 1416 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) { 1417 local_array->push(Handle(thread, protection_domain)); 1418 previous_protection_domain = protection_domain; 1419 } 1420 1421 if (is_privileged) break; 1422 } 1423 1424 1425 // either all the domains on the stack were system domains, or 1426 // we had a privileged system domain 1427 if (local_array->is_empty()) { 1428 if (is_privileged && privileged_context.is_null()) return nullptr; 1429 1430 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1431 return JNIHandles::make_local(THREAD, result); 1432 } 1433 1434 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(), 1435 local_array->length(), CHECK_NULL); 1436 objArrayHandle h_context(thread, context); 1437 for (int index = 0; index < local_array->length(); index++) { 1438 h_context->obj_at_put(index, local_array->at(index)()); 1439 } 1440 1441 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1442 1443 return JNIHandles::make_local(THREAD, result); 1444 JVM_END 1445 1446 class ScopedValueBindingsResolver { 1447 public: 1448 InstanceKlass* Carrier_klass; 1449 ScopedValueBindingsResolver(JavaThread* THREAD) { 1450 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD); 1451 Carrier_klass = InstanceKlass::cast(k); 1452 } 1453 }; 1454 1455 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1456 ResourceMark rm(THREAD); 1457 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1458 JvmtiVMObjectAllocEventCollector oam; 1459 1460 static ScopedValueBindingsResolver resolver(THREAD); 1461 1462 // Iterate through Java frames 1463 vframeStream vfst(thread); 1464 for(; !vfst.at_end(); vfst.next()) { 1465 int loc = -1; 1466 // get method of frame 1467 Method* method = vfst.method(); 1468 1469 Symbol *name = method->name(); 1470 1471 InstanceKlass* holder = method->method_holder(); 1472 if (name == vmSymbols::runWith_method_name()) { 1473 if (holder == vmClasses::Thread_klass() 1474 || holder == resolver.Carrier_klass) { 1475 loc = 1; 1476 } 1477 } 1478 1479 if (loc != -1) { 1480 javaVFrame *frame = vfst.asJavaVFrame(); 1481 StackValueCollection* locals = frame->locals(); 1482 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot 1483 Handle result = head_sv->get_obj(); 1484 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1485 if (result() != nullptr) { 1486 return JNIHandles::make_local(THREAD, result()); 1487 } 1488 } 1489 } 1490 1491 return nullptr; 1492 JVM_END 1493 1494 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1495 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1496 return (k != nullptr) && k->is_array_klass() ? true : false; 1497 JVM_END 1498 1499 1500 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1501 oop mirror = JNIHandles::resolve_non_null(cls); 1502 return (jboolean) java_lang_Class::is_primitive(mirror); 1503 JVM_END 1504 1505 1506 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1507 oop mirror = JNIHandles::resolve_non_null(cls); 1508 if (java_lang_Class::is_primitive(mirror)) { 1509 // Primitive type 1510 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1511 } 1512 1513 Klass* k = java_lang_Class::as_Klass(mirror); 1514 debug_only(int computed_modifiers = k->compute_modifier_flags()); 1515 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1516 return k->modifier_flags(); 1517 JVM_END 1518 1519 1520 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1521 1522 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1523 JvmtiVMObjectAllocEventCollector oam; 1524 // ofClass is a reference to a java_lang_Class object. The mirror object 1525 // of an InstanceKlass 1526 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1527 if (java_lang_Class::is_primitive(ofMirror) || 1528 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1529 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1530 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1531 } 1532 1533 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1534 InnerClassesIterator iter(k); 1535 1536 if (iter.length() == 0) { 1537 // Neither an inner nor outer class 1538 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1539 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1540 } 1541 1542 // find inner class info 1543 constantPoolHandle cp(thread, k->constants()); 1544 int length = iter.length(); 1545 1546 // Allocate temp. result array 1547 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL); 1548 objArrayHandle result (THREAD, r); 1549 int members = 0; 1550 1551 for (; !iter.done(); iter.next()) { 1552 int ioff = iter.inner_class_info_index(); 1553 int ooff = iter.outer_class_info_index(); 1554 1555 if (ioff != 0 && ooff != 0) { 1556 // Check to see if the name matches the class we're looking for 1557 // before attempting to find the class. 1558 if (cp->klass_name_at_matches(k, ooff)) { 1559 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1560 if (outer_klass == k) { 1561 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1562 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1563 1564 // Throws an exception if outer klass has not declared k as 1565 // an inner klass 1566 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1567 1568 result->obj_at_put(members, inner_klass->java_mirror()); 1569 members++; 1570 } 1571 } 1572 } 1573 } 1574 1575 if (members != length) { 1576 // Return array of right length 1577 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL); 1578 for(int i = 0; i < members; i++) { 1579 res->obj_at_put(i, result->obj_at(i)); 1580 } 1581 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1582 } 1583 1584 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1585 JVM_END 1586 1587 1588 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1589 { 1590 // ofClass is a reference to a java_lang_Class object. 1591 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1592 if (java_lang_Class::is_primitive(ofMirror)) { 1593 return nullptr; 1594 } 1595 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1596 if (!klass->is_instance_klass()) { 1597 return nullptr; 1598 } 1599 1600 bool inner_is_member = false; 1601 Klass* outer_klass 1602 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1603 if (outer_klass == nullptr) return nullptr; // already a top-level class 1604 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1605 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1606 } 1607 JVM_END 1608 1609 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1610 { 1611 oop mirror = JNIHandles::resolve_non_null(cls); 1612 if (java_lang_Class::is_primitive(mirror)) { 1613 return nullptr; 1614 } 1615 Klass* klass = java_lang_Class::as_Klass(mirror); 1616 if (!klass->is_instance_klass()) { 1617 return nullptr; 1618 } 1619 InstanceKlass* k = InstanceKlass::cast(klass); 1620 int ooff = 0, noff = 0; 1621 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1622 if (noff != 0) { 1623 constantPoolHandle i_cp(thread, k->constants()); 1624 Symbol* name = i_cp->symbol_at(noff); 1625 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1626 return (jstring) JNIHandles::make_local(THREAD, str()); 1627 } 1628 } 1629 return nullptr; 1630 } 1631 JVM_END 1632 1633 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1634 assert (cls != nullptr, "illegal class"); 1635 JvmtiVMObjectAllocEventCollector oam; 1636 ResourceMark rm(THREAD); 1637 oop mirror = JNIHandles::resolve_non_null(cls); 1638 // Return null for arrays and primitives 1639 if (!java_lang_Class::is_primitive(mirror)) { 1640 Klass* k = java_lang_Class::as_Klass(mirror); 1641 if (k->is_instance_klass()) { 1642 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1643 if (sym == nullptr) return nullptr; 1644 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1645 return (jstring) JNIHandles::make_local(THREAD, str()); 1646 } 1647 } 1648 return nullptr; 1649 JVM_END 1650 1651 1652 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1653 assert (cls != nullptr, "illegal class"); 1654 oop mirror = JNIHandles::resolve_non_null(cls); 1655 // Return null for arrays and primitives 1656 if (!java_lang_Class::is_primitive(mirror)) { 1657 Klass* k = java_lang_Class::as_Klass(mirror); 1658 if (k->is_instance_klass()) { 1659 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1660 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1661 } 1662 } 1663 return nullptr; 1664 JVM_END 1665 1666 1667 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1668 // some of this code was adapted from from jni_FromReflectedField 1669 1670 oop reflected = JNIHandles::resolve_non_null(field); 1671 oop mirror = java_lang_reflect_Field::clazz(reflected); 1672 Klass* k = java_lang_Class::as_Klass(mirror); 1673 int slot = java_lang_reflect_Field::slot(reflected); 1674 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1675 1676 InstanceKlass* ik = InstanceKlass::cast(k); 1677 int offset = ik->field_offset(slot); 1678 1679 if (modifiers & JVM_ACC_STATIC) { 1680 // for static fields we only look in the current class 1681 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1682 assert(false, "cannot find static field"); 1683 return false; 1684 } 1685 } else { 1686 // for instance fields we start with the current class and work 1687 // our way up through the superclass chain 1688 if (!ik->find_field_from_offset(offset, false, &fd)) { 1689 assert(false, "cannot find instance field"); 1690 return false; 1691 } 1692 } 1693 return true; 1694 } 1695 1696 static Method* jvm_get_method_common(jobject method) { 1697 // some of this code was adapted from from jni_FromReflectedMethod 1698 1699 oop reflected = JNIHandles::resolve_non_null(method); 1700 oop mirror = nullptr; 1701 int slot = 0; 1702 1703 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1704 mirror = java_lang_reflect_Constructor::clazz(reflected); 1705 slot = java_lang_reflect_Constructor::slot(reflected); 1706 } else { 1707 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1708 "wrong type"); 1709 mirror = java_lang_reflect_Method::clazz(reflected); 1710 slot = java_lang_reflect_Method::slot(reflected); 1711 } 1712 Klass* k = java_lang_Class::as_Klass(mirror); 1713 1714 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1715 assert(m != nullptr, "cannot find method"); 1716 return m; // caller has to deal with null in product mode 1717 } 1718 1719 /* Type use annotations support (JDK 1.8) */ 1720 1721 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1722 assert (cls != nullptr, "illegal class"); 1723 ResourceMark rm(THREAD); 1724 // Return null for arrays and primitives 1725 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1726 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1727 if (k->is_instance_klass()) { 1728 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1729 if (type_annotations != nullptr) { 1730 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1731 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1732 } 1733 } 1734 } 1735 return nullptr; 1736 JVM_END 1737 1738 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1739 assert (method != nullptr, "illegal method"); 1740 // method is a handle to a java.lang.reflect.Method object 1741 Method* m = jvm_get_method_common(method); 1742 if (m == nullptr) { 1743 return nullptr; 1744 } 1745 1746 AnnotationArray* type_annotations = m->type_annotations(); 1747 if (type_annotations != nullptr) { 1748 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1749 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1750 } 1751 1752 return nullptr; 1753 JVM_END 1754 1755 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1756 assert (field != nullptr, "illegal field"); 1757 fieldDescriptor fd; 1758 bool gotFd = jvm_get_field_common(field, fd); 1759 if (!gotFd) { 1760 return nullptr; 1761 } 1762 1763 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1764 JVM_END 1765 1766 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1767 if (!cp->is_within_bounds(index)) { 1768 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1769 } 1770 } 1771 1772 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1773 { 1774 // method is a handle to a java.lang.reflect.Method object 1775 Method* method_ptr = jvm_get_method_common(method); 1776 methodHandle mh (THREAD, method_ptr); 1777 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1778 const int num_params = mh->method_parameters_length(); 1779 1780 if (num_params < 0) { 1781 // A -1 return value from method_parameters_length means there is no 1782 // parameter data. Return null to indicate this to the reflection 1783 // API. 1784 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1785 return (jobjectArray)nullptr; 1786 } else { 1787 // Otherwise, we return something up to reflection, even if it is 1788 // a zero-length array. Why? Because in some cases this can 1789 // trigger a MalformedParametersException. 1790 1791 // make sure all the symbols are properly formatted 1792 for (int i = 0; i < num_params; i++) { 1793 MethodParametersElement* params = mh->method_parameters_start(); 1794 int index = params[i].name_cp_index; 1795 constantPoolHandle cp(THREAD, mh->constants()); 1796 bounds_check(cp, index, CHECK_NULL); 1797 1798 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1799 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1800 "Wrong type at constant pool index"); 1801 } 1802 1803 } 1804 1805 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1806 objArrayHandle result (THREAD, result_oop); 1807 1808 for (int i = 0; i < num_params; i++) { 1809 MethodParametersElement* params = mh->method_parameters_start(); 1810 // For a 0 index, give a null symbol 1811 Symbol* sym = 0 != params[i].name_cp_index ? 1812 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1813 int flags = params[i].flags; 1814 oop param = Reflection::new_parameter(reflected_method, i, sym, 1815 flags, CHECK_NULL); 1816 result->obj_at_put(i, param); 1817 } 1818 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1819 } 1820 } 1821 JVM_END 1822 1823 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1824 1825 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1826 { 1827 JvmtiVMObjectAllocEventCollector oam; 1828 1829 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1830 // Exclude primitive types and array types 1831 if (java_lang_Class::is_primitive(ofMirror) || 1832 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1833 // Return empty array 1834 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1835 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1836 } 1837 1838 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1839 constantPoolHandle cp(THREAD, k->constants()); 1840 1841 // Ensure class is linked 1842 k->link_class(CHECK_NULL); 1843 1844 // Allocate result 1845 int num_fields; 1846 1847 if (publicOnly) { 1848 num_fields = 0; 1849 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1850 if (fs.access_flags().is_public()) ++num_fields; 1851 } 1852 } else { 1853 num_fields = k->java_fields_count(); 1854 } 1855 1856 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1857 objArrayHandle result (THREAD, r); 1858 1859 int out_idx = 0; 1860 fieldDescriptor fd; 1861 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1862 if (!publicOnly || fs.access_flags().is_public()) { 1863 fd.reinitialize(k, fs.index()); 1864 oop field = Reflection::new_field(&fd, CHECK_NULL); 1865 result->obj_at_put(out_idx, field); 1866 ++out_idx; 1867 } 1868 } 1869 assert(out_idx == num_fields, "just checking"); 1870 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1871 } 1872 JVM_END 1873 1874 // A class is a record if and only if it is final and a direct subclass of 1875 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1876 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1877 { 1878 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1879 if (k != nullptr && k->is_instance_klass()) { 1880 InstanceKlass* ik = InstanceKlass::cast(k); 1881 return ik->is_record(); 1882 } else { 1883 return false; 1884 } 1885 } 1886 JVM_END 1887 1888 // Returns an array containing the components of the Record attribute, 1889 // or null if the attribute is not present. 1890 // 1891 // Note that this function returns the components of the Record attribute 1892 // even if the class is not a record. 1893 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1894 { 1895 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1896 assert(c->is_instance_klass(), "must be"); 1897 InstanceKlass* ik = InstanceKlass::cast(c); 1898 1899 Array<RecordComponent*>* components = ik->record_components(); 1900 if (components != nullptr) { 1901 JvmtiVMObjectAllocEventCollector oam; 1902 constantPoolHandle cp(THREAD, ik->constants()); 1903 int length = components->length(); 1904 assert(length >= 0, "unexpected record_components length"); 1905 objArrayOop record_components = 1906 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1907 objArrayHandle components_h (THREAD, record_components); 1908 1909 for (int x = 0; x < length; x++) { 1910 RecordComponent* component = components->at(x); 1911 assert(component != nullptr, "unexpected null record component"); 1912 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1913 components_h->obj_at_put(x, component_oop); 1914 } 1915 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1916 } 1917 1918 return nullptr; 1919 } 1920 JVM_END 1921 1922 static bool select_method(const methodHandle& method, bool want_constructor) { 1923 bool is_ctor = (method->is_object_constructor()); 1924 if (want_constructor) { 1925 return is_ctor; 1926 } else { 1927 return (!is_ctor && 1928 !method->is_class_initializer() && 1929 !method->is_overpass()); 1930 } 1931 } 1932 1933 static jobjectArray get_class_declared_methods_helper( 1934 JNIEnv *env, 1935 jclass ofClass, jboolean publicOnly, 1936 bool want_constructor, 1937 Klass* klass, TRAPS) { 1938 1939 JvmtiVMObjectAllocEventCollector oam; 1940 1941 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1942 // Exclude primitive types and array types 1943 if (java_lang_Class::is_primitive(ofMirror) 1944 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1945 // Return empty array 1946 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1947 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1948 } 1949 1950 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1951 1952 // Ensure class is linked 1953 k->link_class(CHECK_NULL); 1954 1955 Array<Method*>* methods = k->methods(); 1956 int methods_length = methods->length(); 1957 1958 // Save original method_idnum in case of redefinition, which can change 1959 // the idnum of obsolete methods. The new method will have the same idnum 1960 // but if we refresh the methods array, the counts will be wrong. 1961 ResourceMark rm(THREAD); 1962 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1963 int num_methods = 0; 1964 1965 for (int i = 0; i < methods_length; i++) { 1966 methodHandle method(THREAD, methods->at(i)); 1967 if (select_method(method, want_constructor)) { 1968 if (!publicOnly || method->is_public()) { 1969 idnums->push(method->method_idnum()); 1970 ++num_methods; 1971 } 1972 } 1973 } 1974 1975 // Allocate result 1976 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1977 objArrayHandle result (THREAD, r); 1978 1979 // Now just put the methods that we selected above, but go by their idnum 1980 // in case of redefinition. The methods can be redefined at any safepoint, 1981 // so above when allocating the oop array and below when creating reflect 1982 // objects. 1983 for (int i = 0; i < num_methods; i++) { 1984 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1985 if (method.is_null()) { 1986 // Method may have been deleted and seems this API can handle null 1987 // Otherwise should probably put a method that throws NSME 1988 result->obj_at_put(i, nullptr); 1989 } else { 1990 oop m; 1991 if (want_constructor) { 1992 assert(method->is_object_constructor(), "must be"); 1993 m = Reflection::new_constructor(method, CHECK_NULL); 1994 } else { 1995 m = Reflection::new_method(method, false, CHECK_NULL); 1996 } 1997 result->obj_at_put(i, m); 1998 } 1999 } 2000 2001 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 2002 } 2003 2004 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 2005 { 2006 return get_class_declared_methods_helper(env, ofClass, publicOnly, 2007 /*want_constructor*/ false, 2008 vmClasses::reflect_Method_klass(), THREAD); 2009 } 2010 JVM_END 2011 2012 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 2013 { 2014 return get_class_declared_methods_helper(env, ofClass, publicOnly, 2015 /*want_constructor*/ true, 2016 vmClasses::reflect_Constructor_klass(), THREAD); 2017 } 2018 JVM_END 2019 2020 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 2021 { 2022 oop mirror = JNIHandles::resolve_non_null(cls); 2023 if (java_lang_Class::is_primitive(mirror)) { 2024 // Primitive type 2025 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 2026 } 2027 2028 Klass* k = java_lang_Class::as_Klass(mirror); 2029 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 2030 } 2031 JVM_END 2032 2033 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 2034 { 2035 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2036 assert(c->is_instance_klass(), "must be"); 2037 InstanceKlass* ck = InstanceKlass::cast(c); 2038 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 2039 assert(m->is_instance_klass(), "must be"); 2040 InstanceKlass* mk = InstanceKlass::cast(m); 2041 return ck->has_nestmate_access_to(mk, THREAD); 2042 } 2043 JVM_END 2044 2045 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 2046 { 2047 // current is not a primitive or array class 2048 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2049 assert(c->is_instance_klass(), "must be"); 2050 InstanceKlass* ck = InstanceKlass::cast(c); 2051 InstanceKlass* host = ck->nest_host(THREAD); 2052 return (jclass) (host == nullptr ? nullptr : 2053 JNIHandles::make_local(THREAD, host->java_mirror())); 2054 } 2055 JVM_END 2056 2057 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 2058 { 2059 // current is not a primitive or array class 2060 ResourceMark rm(THREAD); 2061 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2062 assert(c->is_instance_klass(), "must be"); 2063 InstanceKlass* ck = InstanceKlass::cast(c); 2064 InstanceKlass* host = ck->nest_host(THREAD); 2065 2066 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 2067 ck->external_name(), host->external_name()); 2068 { 2069 JvmtiVMObjectAllocEventCollector oam; 2070 Array<u2>* members = host->nest_members(); 2071 int length = members == nullptr ? 0 : members->length(); 2072 2073 log_trace(class, nestmates)(" - host has %d listed nest members", length); 2074 2075 // nest host is first in the array so make it one bigger 2076 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2077 length + 1, CHECK_NULL); 2078 objArrayHandle result(THREAD, r); 2079 result->obj_at_put(0, host->java_mirror()); 2080 if (length != 0) { 2081 int count = 0; 2082 for (int i = 0; i < length; i++) { 2083 int cp_index = members->at(i); 2084 Klass* k = host->constants()->klass_at(cp_index, THREAD); 2085 if (HAS_PENDING_EXCEPTION) { 2086 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2087 return nullptr; // propagate VMEs 2088 } 2089 if (log_is_enabled(Trace, class, nestmates)) { 2090 stringStream ss; 2091 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2092 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2093 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2094 log_trace(class, nestmates)("%s", ss.as_string()); 2095 } 2096 CLEAR_PENDING_EXCEPTION; 2097 continue; 2098 } 2099 if (k->is_instance_klass()) { 2100 InstanceKlass* ik = InstanceKlass::cast(k); 2101 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2102 if (nest_host_k == host) { 2103 result->obj_at_put(count+1, k->java_mirror()); 2104 count++; 2105 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2106 } else { 2107 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2108 ik->external_name(), nest_host_k->external_name()); 2109 } 2110 } else { 2111 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2112 k->external_name()); 2113 } 2114 } 2115 if (count < length) { 2116 // we had invalid entries so we need to compact the array 2117 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2118 length + 1, count + 1); 2119 2120 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2121 count + 1, CHECK_NULL); 2122 objArrayHandle result2(THREAD, r2); 2123 for (int i = 0; i < count + 1; i++) { 2124 result2->obj_at_put(i, result->obj_at(i)); 2125 } 2126 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2127 } 2128 } 2129 else { 2130 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate"); 2131 } 2132 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2133 } 2134 } 2135 JVM_END 2136 2137 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2138 { 2139 oop mirror = JNIHandles::resolve_non_null(current); 2140 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2141 Klass* c = java_lang_Class::as_Klass(mirror); 2142 assert(c->is_instance_klass(), "must be"); 2143 InstanceKlass* ik = InstanceKlass::cast(c); 2144 ResourceMark rm(THREAD); 2145 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2146 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2147 if (ik->is_sealed()) { 2148 JvmtiVMObjectAllocEventCollector oam; 2149 Array<u2>* subclasses = ik->permitted_subclasses(); 2150 int length = subclasses->length(); 2151 2152 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2153 2154 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2155 length, CHECK_NULL); 2156 objArrayHandle result(THREAD, r); 2157 int count = 0; 2158 for (int i = 0; i < length; i++) { 2159 int cp_index = subclasses->at(i); 2160 Klass* k = ik->constants()->klass_at(cp_index, THREAD); 2161 if (HAS_PENDING_EXCEPTION) { 2162 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2163 return nullptr; // propagate VMEs 2164 } 2165 if (log_is_enabled(Trace, class, sealed)) { 2166 stringStream ss; 2167 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2168 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2169 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2170 log_trace(class, sealed)("%s", ss.as_string()); 2171 } 2172 2173 CLEAR_PENDING_EXCEPTION; 2174 continue; 2175 } 2176 if (k->is_instance_klass()) { 2177 result->obj_at_put(count++, k->java_mirror()); 2178 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2179 } 2180 } 2181 if (count < length) { 2182 // we had invalid entries so we need to compact the array 2183 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2184 count, CHECK_NULL); 2185 objArrayHandle result2(THREAD, r2); 2186 for (int i = 0; i < count; i++) { 2187 result2->obj_at_put(i, result->obj_at(i)); 2188 } 2189 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2190 } 2191 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2192 } else { 2193 return nullptr; 2194 } 2195 } 2196 JVM_END 2197 2198 // Constant pool access ////////////////////////////////////////////////////////// 2199 2200 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2201 { 2202 JvmtiVMObjectAllocEventCollector oam; 2203 oop mirror = JNIHandles::resolve_non_null(cls); 2204 // Return null for primitives and arrays 2205 if (!java_lang_Class::is_primitive(mirror)) { 2206 Klass* k = java_lang_Class::as_Klass(mirror); 2207 if (k->is_instance_klass()) { 2208 InstanceKlass* k_h = InstanceKlass::cast(k); 2209 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2210 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2211 return JNIHandles::make_local(THREAD, jcp()); 2212 } 2213 } 2214 return nullptr; 2215 } 2216 JVM_END 2217 2218 2219 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2220 { 2221 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2222 return cp->length(); 2223 } 2224 JVM_END 2225 2226 2227 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2228 { 2229 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2230 bounds_check(cp, index, CHECK_NULL); 2231 constantTag tag = cp->tag_at(index); 2232 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2233 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2234 } 2235 Klass* k = cp->klass_at(index, CHECK_NULL); 2236 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2237 } 2238 JVM_END 2239 2240 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2241 { 2242 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2243 bounds_check(cp, index, CHECK_NULL); 2244 constantTag tag = cp->tag_at(index); 2245 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2246 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2247 } 2248 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2249 if (k == nullptr) return nullptr; 2250 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2251 } 2252 JVM_END 2253 2254 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2255 constantTag tag = cp->tag_at(index); 2256 if (!tag.is_method() && !tag.is_interface_method()) { 2257 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2258 } 2259 int klass_ref = cp->uncached_klass_ref_index_at(index); 2260 Klass* k_o; 2261 if (force_resolution) { 2262 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2263 } else { 2264 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2265 if (k_o == nullptr) return nullptr; 2266 } 2267 InstanceKlass* k = InstanceKlass::cast(k_o); 2268 Symbol* name = cp->uncached_name_ref_at(index); 2269 Symbol* sig = cp->uncached_signature_ref_at(index); 2270 methodHandle m (THREAD, k->find_method(name, sig)); 2271 if (m.is_null()) { 2272 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2273 } 2274 oop method; 2275 if (m->is_object_constructor()) { 2276 method = Reflection::new_constructor(m, CHECK_NULL); 2277 } else { 2278 method = Reflection::new_method(m, true, CHECK_NULL); 2279 } 2280 return JNIHandles::make_local(THREAD, method); 2281 } 2282 2283 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2284 { 2285 JvmtiVMObjectAllocEventCollector oam; 2286 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2287 bounds_check(cp, index, CHECK_NULL); 2288 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2289 return res; 2290 } 2291 JVM_END 2292 2293 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2294 { 2295 JvmtiVMObjectAllocEventCollector oam; 2296 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2297 bounds_check(cp, index, CHECK_NULL); 2298 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2299 return res; 2300 } 2301 JVM_END 2302 2303 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2304 constantTag tag = cp->tag_at(index); 2305 if (!tag.is_field()) { 2306 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2307 } 2308 int klass_ref = cp->uncached_klass_ref_index_at(index); 2309 Klass* k_o; 2310 if (force_resolution) { 2311 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2312 } else { 2313 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2314 if (k_o == nullptr) return nullptr; 2315 } 2316 InstanceKlass* k = InstanceKlass::cast(k_o); 2317 Symbol* name = cp->uncached_name_ref_at(index); 2318 Symbol* sig = cp->uncached_signature_ref_at(index); 2319 fieldDescriptor fd; 2320 Klass* target_klass = k->find_field(name, sig, &fd); 2321 if (target_klass == nullptr) { 2322 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2323 } 2324 oop field = Reflection::new_field(&fd, CHECK_NULL); 2325 return JNIHandles::make_local(THREAD, field); 2326 } 2327 2328 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2329 { 2330 JvmtiVMObjectAllocEventCollector oam; 2331 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2332 bounds_check(cp, index, CHECK_NULL); 2333 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2334 return res; 2335 } 2336 JVM_END 2337 2338 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2339 { 2340 JvmtiVMObjectAllocEventCollector oam; 2341 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2342 bounds_check(cp, index, CHECK_NULL); 2343 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2344 return res; 2345 } 2346 JVM_END 2347 2348 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2349 { 2350 JvmtiVMObjectAllocEventCollector oam; 2351 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2352 bounds_check(cp, index, CHECK_NULL); 2353 constantTag tag = cp->tag_at(index); 2354 if (!tag.is_field_or_method()) { 2355 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2356 } 2357 int klass_ref = cp->uncached_klass_ref_index_at(index); 2358 Symbol* klass_name = cp->klass_name_at(klass_ref); 2359 Symbol* member_name = cp->uncached_name_ref_at(index); 2360 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2361 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2362 objArrayHandle dest(THREAD, dest_o); 2363 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2364 dest->obj_at_put(0, str()); 2365 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2366 dest->obj_at_put(1, str()); 2367 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2368 dest->obj_at_put(2, str()); 2369 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2370 } 2371 JVM_END 2372 2373 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2374 { 2375 JvmtiVMObjectAllocEventCollector oam; 2376 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2377 bounds_check(cp, index, CHECK_0); 2378 constantTag tag = cp->tag_at(index); 2379 if (!tag.is_field_or_method()) { 2380 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2381 } 2382 return (jint) cp->uncached_klass_ref_index_at(index); 2383 } 2384 JVM_END 2385 2386 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2387 { 2388 JvmtiVMObjectAllocEventCollector oam; 2389 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2390 bounds_check(cp, index, CHECK_0); 2391 constantTag tag = cp->tag_at(index); 2392 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2393 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2394 } 2395 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2396 } 2397 JVM_END 2398 2399 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2400 { 2401 JvmtiVMObjectAllocEventCollector oam; 2402 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2403 bounds_check(cp, index, CHECK_NULL); 2404 constantTag tag = cp->tag_at(index); 2405 if (!tag.is_name_and_type()) { 2406 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2407 } 2408 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2409 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2410 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2411 objArrayHandle dest(THREAD, dest_o); 2412 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2413 dest->obj_at_put(0, str()); 2414 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2415 dest->obj_at_put(1, str()); 2416 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2417 } 2418 JVM_END 2419 2420 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2421 { 2422 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2423 bounds_check(cp, index, CHECK_0); 2424 constantTag tag = cp->tag_at(index); 2425 if (!tag.is_int()) { 2426 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2427 } 2428 return cp->int_at(index); 2429 } 2430 JVM_END 2431 2432 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2433 { 2434 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2435 bounds_check(cp, index, CHECK_(0L)); 2436 constantTag tag = cp->tag_at(index); 2437 if (!tag.is_long()) { 2438 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2439 } 2440 return cp->long_at(index); 2441 } 2442 JVM_END 2443 2444 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2445 { 2446 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2447 bounds_check(cp, index, CHECK_(0.0f)); 2448 constantTag tag = cp->tag_at(index); 2449 if (!tag.is_float()) { 2450 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2451 } 2452 return cp->float_at(index); 2453 } 2454 JVM_END 2455 2456 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2457 { 2458 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2459 bounds_check(cp, index, CHECK_(0.0)); 2460 constantTag tag = cp->tag_at(index); 2461 if (!tag.is_double()) { 2462 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2463 } 2464 return cp->double_at(index); 2465 } 2466 JVM_END 2467 2468 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2469 { 2470 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2471 bounds_check(cp, index, CHECK_NULL); 2472 constantTag tag = cp->tag_at(index); 2473 if (!tag.is_string()) { 2474 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2475 } 2476 oop str = cp->string_at(index, CHECK_NULL); 2477 return (jstring) JNIHandles::make_local(THREAD, str); 2478 } 2479 JVM_END 2480 2481 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2482 { 2483 JvmtiVMObjectAllocEventCollector oam; 2484 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2485 bounds_check(cp, index, CHECK_NULL); 2486 constantTag tag = cp->tag_at(index); 2487 if (!tag.is_symbol()) { 2488 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2489 } 2490 Symbol* sym = cp->symbol_at(index); 2491 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2492 return (jstring) JNIHandles::make_local(THREAD, str()); 2493 } 2494 JVM_END 2495 2496 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2497 { 2498 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2499 bounds_check(cp, index, CHECK_0); 2500 constantTag tag = cp->tag_at(index); 2501 jbyte result = tag.value(); 2502 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2503 // they are changed to the corresponding tags from the JVM spec, so that java code in 2504 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2505 if (tag.is_klass_or_reference()) { 2506 result = JVM_CONSTANT_Class; 2507 } else if (tag.is_string_index()) { 2508 result = JVM_CONSTANT_String; 2509 } else if (tag.is_method_type_in_error()) { 2510 result = JVM_CONSTANT_MethodType; 2511 } else if (tag.is_method_handle_in_error()) { 2512 result = JVM_CONSTANT_MethodHandle; 2513 } else if (tag.is_dynamic_constant_in_error()) { 2514 result = JVM_CONSTANT_Dynamic; 2515 } 2516 return result; 2517 } 2518 JVM_END 2519 2520 // Assertion support. ////////////////////////////////////////////////////////// 2521 2522 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2523 assert(cls != nullptr, "bad class"); 2524 2525 oop r = JNIHandles::resolve(cls); 2526 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2527 if (java_lang_Class::is_primitive(r)) return false; 2528 2529 Klass* k = java_lang_Class::as_Klass(r); 2530 assert(k->is_instance_klass(), "must be an instance klass"); 2531 if (!k->is_instance_klass()) return false; 2532 2533 ResourceMark rm(THREAD); 2534 const char* name = k->name()->as_C_string(); 2535 bool system_class = k->class_loader() == nullptr; 2536 return JavaAssertions::enabled(name, system_class); 2537 2538 JVM_END 2539 2540 2541 // Return a new AssertionStatusDirectives object with the fields filled in with 2542 // command-line assertion arguments (i.e., -ea, -da). 2543 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2544 JvmtiVMObjectAllocEventCollector oam; 2545 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2546 return JNIHandles::make_local(THREAD, asd); 2547 JVM_END 2548 2549 // Arrays support ///////////////////////////////////////////////////////////// 2550 2551 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2552 oop o = JNIHandles::resolve(array); 2553 Klass* k = o->klass(); 2554 if ((o == nullptr) || (!k->is_array_klass())) { 2555 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2556 } 2557 return ArrayKlass::cast(k)->element_access_is_atomic(); 2558 JVM_END 2559 2560 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2561 oop o = JNIHandles::resolve(array); 2562 Klass* k = o->klass(); 2563 if ((o == nullptr) || (!k->is_array_klass())) { 2564 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2565 } 2566 if (k->is_flatArray_klass()) { 2567 FlatArrayKlass* vk = FlatArrayKlass::cast(k); 2568 if (!vk->element_access_is_atomic()) { 2569 /** 2570 * Need to decide how to implement: 2571 * 2572 * 1) Change to objArrayOop layout, therefore oop->klass() differs so 2573 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through 2574 * "checkcast" & "instanceof" 2575 * 2576 * 2) Use extra header in the flatArrayOop to flag atomicity required and 2577 * possibly per instance lock structure. Said info, could be placed in 2578 * "trailer" rather than disturb the current arrayOop 2579 */ 2580 Unimplemented(); 2581 } 2582 } 2583 return array; 2584 JVM_END 2585 2586 // Verification //////////////////////////////////////////////////////////////////////////////// 2587 2588 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2589 2590 // RedefineClasses support: bug 6214132 caused verification to fail. 2591 // All functions from this section should call the jvmtiThreadSate function: 2592 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2593 // The function returns a Klass* of the _scratch_class if the verifier 2594 // was invoked in the middle of the class redefinition. 2595 // Otherwise it returns its argument value which is the _the_class Klass*. 2596 // Please, refer to the description in the jvmtiThreadSate.hpp. 2597 2598 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2599 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2600 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2601 return k->name()->as_utf8(); 2602 JVM_END 2603 2604 2605 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2606 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2607 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2608 // types will have length zero if this is not an InstanceKlass 2609 // (length is determined by call to JVM_GetClassCPEntriesCount) 2610 if (k->is_instance_klass()) { 2611 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2612 for (int index = cp->length() - 1; index >= 0; index--) { 2613 constantTag tag = cp->tag_at(index); 2614 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2615 } 2616 } 2617 JVM_END 2618 2619 2620 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2621 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2622 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2623 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2624 JVM_END 2625 2626 2627 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2628 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2629 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2630 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2631 JVM_END 2632 2633 2634 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2635 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2636 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2637 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2638 JVM_END 2639 2640 2641 // The following methods, used for the verifier, are never called with 2642 // array klasses, so a direct cast to InstanceKlass is safe. 2643 // Typically, these methods are called in a loop with bounds determined 2644 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2645 // zero for arrays. 2646 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2647 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2648 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2649 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2650 int length = method->checked_exceptions_length(); 2651 if (length > 0) { 2652 CheckedExceptionElement* table= method->checked_exceptions_start(); 2653 for (int i = 0; i < length; i++) { 2654 exceptions[i] = table[i].class_cp_index; 2655 } 2656 } 2657 JVM_END 2658 2659 2660 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2661 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2662 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2663 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2664 return method->checked_exceptions_length(); 2665 JVM_END 2666 2667 2668 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2669 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2670 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2671 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2672 memcpy(code, method->code_base(), method->code_size()); 2673 JVM_END 2674 2675 2676 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2677 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2678 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2679 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2680 return method->code_size(); 2681 JVM_END 2682 2683 2684 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2685 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2686 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2687 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2688 ExceptionTable extable(method); 2689 entry->start_pc = extable.start_pc(entry_index); 2690 entry->end_pc = extable.end_pc(entry_index); 2691 entry->handler_pc = extable.handler_pc(entry_index); 2692 entry->catchType = extable.catch_type_index(entry_index); 2693 JVM_END 2694 2695 2696 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2697 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2698 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2699 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2700 return method->exception_table_length(); 2701 JVM_END 2702 2703 2704 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2705 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2706 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2707 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2708 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2709 JVM_END 2710 2711 2712 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2713 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2714 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2715 return InstanceKlass::cast(k)->field_access_flags(field_index); 2716 JVM_END 2717 2718 2719 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2720 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2721 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2722 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2723 return method->max_locals(); 2724 JVM_END 2725 2726 2727 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2728 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2729 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2730 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2731 return method->size_of_parameters(); 2732 JVM_END 2733 2734 2735 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2736 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2737 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2738 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2739 return method->verifier_max_stack(); 2740 JVM_END 2741 2742 2743 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2744 ResourceMark rm(THREAD); 2745 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2746 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2747 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2748 return method->is_object_constructor(); 2749 JVM_END 2750 2751 2752 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2753 ResourceMark rm(THREAD); 2754 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2755 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2756 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2757 return method->is_overpass(); 2758 JVM_END 2759 2760 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2761 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2762 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2763 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2764 return method->name()->as_utf8(); 2765 JVM_END 2766 2767 2768 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2769 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2770 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2771 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2772 return method->signature()->as_utf8(); 2773 JVM_END 2774 2775 /** 2776 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2777 * read entries in the constant pool. Since the old verifier always 2778 * works on a copy of the code, it will not see any rewriting that 2779 * may possibly occur in the middle of verification. So it is important 2780 * that nothing it calls tries to use the cpCache instead of the raw 2781 * constant pool, so we must use cp->uncached_x methods when appropriate. 2782 */ 2783 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2784 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2785 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2786 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2787 switch (cp->tag_at(cp_index).value()) { 2788 case JVM_CONSTANT_Fieldref: 2789 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2790 default: 2791 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2792 } 2793 ShouldNotReachHere(); 2794 return nullptr; 2795 JVM_END 2796 2797 2798 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2799 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2800 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2801 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2802 switch (cp->tag_at(cp_index).value()) { 2803 case JVM_CONSTANT_InterfaceMethodref: 2804 case JVM_CONSTANT_Methodref: 2805 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2806 default: 2807 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2808 } 2809 ShouldNotReachHere(); 2810 return nullptr; 2811 JVM_END 2812 2813 2814 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2815 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2816 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2817 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2818 switch (cp->tag_at(cp_index).value()) { 2819 case JVM_CONSTANT_InterfaceMethodref: 2820 case JVM_CONSTANT_Methodref: 2821 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2822 default: 2823 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2824 } 2825 ShouldNotReachHere(); 2826 return nullptr; 2827 JVM_END 2828 2829 2830 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2831 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2832 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2833 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2834 switch (cp->tag_at(cp_index).value()) { 2835 case JVM_CONSTANT_Fieldref: 2836 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2837 default: 2838 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2839 } 2840 ShouldNotReachHere(); 2841 return nullptr; 2842 JVM_END 2843 2844 2845 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2846 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2847 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2848 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2849 Symbol* classname = cp->klass_name_at(cp_index); 2850 return classname->as_utf8(); 2851 JVM_END 2852 2853 2854 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2855 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2856 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2857 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2858 switch (cp->tag_at(cp_index).value()) { 2859 case JVM_CONSTANT_Fieldref: { 2860 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2861 Symbol* classname = cp->klass_name_at(class_index); 2862 return classname->as_utf8(); 2863 } 2864 default: 2865 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2866 } 2867 ShouldNotReachHere(); 2868 return nullptr; 2869 JVM_END 2870 2871 2872 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2873 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2874 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2875 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2876 switch (cp->tag_at(cp_index).value()) { 2877 case JVM_CONSTANT_Methodref: 2878 case JVM_CONSTANT_InterfaceMethodref: { 2879 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2880 Symbol* classname = cp->klass_name_at(class_index); 2881 return classname->as_utf8(); 2882 } 2883 default: 2884 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2885 } 2886 ShouldNotReachHere(); 2887 return nullptr; 2888 JVM_END 2889 2890 2891 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2892 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2893 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2894 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2895 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2896 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2897 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2898 switch (cp->tag_at(cp_index).value()) { 2899 case JVM_CONSTANT_Fieldref: { 2900 Symbol* name = cp->uncached_name_ref_at(cp_index); 2901 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2902 InstanceKlass* ik = InstanceKlass::cast(k_called); 2903 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2904 if (fs.name() == name && fs.signature() == signature) { 2905 return fs.access_flags().as_short(); 2906 } 2907 } 2908 return -1; 2909 } 2910 default: 2911 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2912 } 2913 ShouldNotReachHere(); 2914 return 0; 2915 JVM_END 2916 2917 2918 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2919 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2920 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2921 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2922 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2923 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2924 switch (cp->tag_at(cp_index).value()) { 2925 case JVM_CONSTANT_Methodref: 2926 case JVM_CONSTANT_InterfaceMethodref: { 2927 Symbol* name = cp->uncached_name_ref_at(cp_index); 2928 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2929 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2930 int methods_count = methods->length(); 2931 for (int i = 0; i < methods_count; i++) { 2932 Method* method = methods->at(i); 2933 if (method->name() == name && method->signature() == signature) { 2934 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2935 } 2936 } 2937 return -1; 2938 } 2939 default: 2940 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2941 } 2942 ShouldNotReachHere(); 2943 return 0; 2944 JVM_END 2945 2946 2947 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2948 2949 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2950 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2951 JVM_END 2952 2953 2954 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2955 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2956 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2957 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2958 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2959 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2960 JVM_END 2961 2962 // Printing support ////////////////////////////////////////////////// 2963 extern "C" { 2964 2965 ATTRIBUTE_PRINTF(3, 0) 2966 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2967 // Reject count values that are negative signed values converted to 2968 // unsigned; see bug 4399518, 4417214 2969 if ((intptr_t)count <= 0) return -1; 2970 2971 int result = os::vsnprintf(str, count, fmt, args); 2972 if (result > 0 && (size_t)result >= count) { 2973 result = -1; 2974 } 2975 2976 return result; 2977 } 2978 2979 ATTRIBUTE_PRINTF(3, 4) 2980 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2981 va_list args; 2982 int len; 2983 va_start(args, fmt); 2984 len = jio_vsnprintf(str, count, fmt, args); 2985 va_end(args); 2986 return len; 2987 } 2988 2989 ATTRIBUTE_PRINTF(2, 3) 2990 int jio_fprintf(FILE* f, const char *fmt, ...) { 2991 int len; 2992 va_list args; 2993 va_start(args, fmt); 2994 len = jio_vfprintf(f, fmt, args); 2995 va_end(args); 2996 return len; 2997 } 2998 2999 ATTRIBUTE_PRINTF(2, 0) 3000 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 3001 if (Arguments::vfprintf_hook() != nullptr) { 3002 return Arguments::vfprintf_hook()(f, fmt, args); 3003 } else { 3004 return vfprintf(f, fmt, args); 3005 } 3006 } 3007 3008 ATTRIBUTE_PRINTF(1, 2) 3009 JNIEXPORT int jio_printf(const char *fmt, ...) { 3010 int len; 3011 va_list args; 3012 va_start(args, fmt); 3013 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 3014 va_end(args); 3015 return len; 3016 } 3017 3018 // HotSpot specific jio method 3019 void jio_print(const char* s, size_t len) { 3020 // Try to make this function as atomic as possible. 3021 if (Arguments::vfprintf_hook() != nullptr) { 3022 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 3023 } else { 3024 // Make an unused local variable to avoid warning from gcc compiler. 3025 bool dummy = os::write(defaultStream::output_fd(), s, len); 3026 } 3027 } 3028 3029 } // Extern C 3030 3031 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 3032 3033 // In most of the JVM thread support functions we need to access the 3034 // thread through a ThreadsListHandle to prevent it from exiting and 3035 // being reclaimed while we try to operate on it. The exceptions to this 3036 // rule are when operating on the current thread, or if the monitor of 3037 // the target java.lang.Thread is locked at the Java level - in both 3038 // cases the target cannot exit. 3039 3040 static void thread_entry(JavaThread* thread, TRAPS) { 3041 HandleMark hm(THREAD); 3042 Handle obj(THREAD, thread->threadObj()); 3043 JavaValue result(T_VOID); 3044 JavaCalls::call_virtual(&result, 3045 obj, 3046 vmClasses::Thread_klass(), 3047 vmSymbols::run_method_name(), 3048 vmSymbols::void_method_signature(), 3049 THREAD); 3050 } 3051 3052 3053 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 3054 #if INCLUDE_CDS 3055 if (CDSConfig::is_dumping_static_archive()) { 3056 // During java -Xshare:dump, if we allow multiple Java threads to 3057 // execute in parallel, symbols and classes may be loaded in 3058 // random orders which will make the resulting CDS archive 3059 // non-deterministic. 3060 // 3061 // Lucikly, during java -Xshare:dump, it's important to run only 3062 // the code in the main Java thread (which is NOT started here) that 3063 // creates the module graph, etc. It's safe to not start the other 3064 // threads which are launched by class static initializers 3065 // (ReferenceHandler, FinalizerThread and CleanerImpl). 3066 if (log_is_enabled(Info, cds)) { 3067 ResourceMark rm; 3068 oop t = JNIHandles::resolve_non_null(jthread); 3069 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 3070 } 3071 return; 3072 } 3073 #endif 3074 JavaThread *native_thread = nullptr; 3075 3076 // We cannot hold the Threads_lock when we throw an exception, 3077 // due to rank ordering issues. Example: we might need to grab the 3078 // Heap_lock while we construct the exception. 3079 bool throw_illegal_thread_state = false; 3080 3081 // We must release the Threads_lock before we can post a jvmti event 3082 // in Thread::start. 3083 { 3084 // Ensure that the C++ Thread and OSThread structures aren't freed before 3085 // we operate. 3086 MutexLocker mu(Threads_lock); 3087 3088 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 3089 // re-starting an already started thread, so we should usually find 3090 // that the JavaThread is null. However for a JNI attached thread 3091 // there is a small window between the Thread object being created 3092 // (with its JavaThread set) and the update to its threadStatus, so we 3093 // have to check for this 3094 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 3095 throw_illegal_thread_state = true; 3096 } else { 3097 jlong size = 3098 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 3099 // Allocate the C++ Thread structure and create the native thread. The 3100 // stack size retrieved from java is 64-bit signed, but the constructor takes 3101 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 3102 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 3103 // - Avoid passing negative values which would result in really large stacks. 3104 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 3105 size_t sz = size > 0 ? (size_t) size : 0; 3106 native_thread = new JavaThread(&thread_entry, sz); 3107 3108 // At this point it may be possible that no osthread was created for the 3109 // JavaThread due to lack of memory. Check for this situation and throw 3110 // an exception if necessary. Eventually we may want to change this so 3111 // that we only grab the lock if the thread was created successfully - 3112 // then we can also do this check and throw the exception in the 3113 // JavaThread constructor. 3114 if (native_thread->osthread() != nullptr) { 3115 // Note: the current thread is not being used within "prepare". 3116 native_thread->prepare(jthread); 3117 } 3118 } 3119 } 3120 3121 if (throw_illegal_thread_state) { 3122 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3123 } 3124 3125 assert(native_thread != nullptr, "Starting null thread?"); 3126 3127 if (native_thread->osthread() == nullptr) { 3128 ResourceMark rm(thread); 3129 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 3130 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 3131 // No one should hold a reference to the 'native_thread'. 3132 native_thread->smr_delete(); 3133 if (JvmtiExport::should_post_resource_exhausted()) { 3134 JvmtiExport::post_resource_exhausted( 3135 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3136 os::native_thread_creation_failed_msg()); 3137 } 3138 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3139 os::native_thread_creation_failed_msg()); 3140 } 3141 3142 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3143 3144 Thread::start(native_thread); 3145 3146 JVM_END 3147 3148 3149 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3150 ThreadsListHandle tlh(thread); 3151 oop java_thread = nullptr; 3152 JavaThread* receiver = nullptr; 3153 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3154 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3155 3156 if (is_alive) { 3157 // jthread refers to a live JavaThread. 3158 Thread::set_priority(receiver, (ThreadPriority)prio); 3159 } 3160 // Implied else: If the JavaThread hasn't started yet, then the 3161 // priority set in the java.lang.Thread object above will be pushed 3162 // down when it does start. 3163 JVM_END 3164 3165 3166 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3167 if (os::dont_yield()) return; 3168 HOTSPOT_THREAD_YIELD(); 3169 os::naked_yield(); 3170 JVM_END 3171 3172 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos)) 3173 if (nanos < 0) { 3174 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range"); 3175 } 3176 3177 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3178 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3179 } 3180 3181 // Save current thread state and restore it at the end of this block. 3182 // And set new thread state to SLEEPING. 3183 JavaThreadSleepState jtss(thread); 3184 3185 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC); 3186 3187 if (nanos == 0) { 3188 os::naked_yield(); 3189 } else { 3190 ThreadState old_state = thread->osthread()->get_state(); 3191 thread->osthread()->set_state(SLEEPING); 3192 if (!thread->sleep_nanos(nanos)) { // interrupted 3193 // An asynchronous exception could have been thrown on 3194 // us while we were sleeping. We do not overwrite those. 3195 if (!HAS_PENDING_EXCEPTION) { 3196 HOTSPOT_THREAD_SLEEP_END(1); 3197 3198 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3199 // to properly restore the thread state. That's likely wrong. 3200 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3201 } 3202 } 3203 thread->osthread()->set_state(old_state); 3204 } 3205 HOTSPOT_THREAD_SLEEP_END(0); 3206 JVM_END 3207 3208 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3209 oop jthread = thread->threadObj(); 3210 assert(jthread != nullptr, "no current carrier thread!"); 3211 return JNIHandles::make_local(THREAD, jthread); 3212 JVM_END 3213 3214 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3215 oop theThread = thread->vthread(); 3216 assert(theThread != (oop)nullptr, "no current thread!"); 3217 return JNIHandles::make_local(THREAD, theThread); 3218 JVM_END 3219 3220 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3221 jobject theThread)) 3222 oop threadObj = JNIHandles::resolve(theThread); 3223 thread->set_vthread(threadObj); 3224 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3225 JVM_END 3226 3227 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3228 return ThreadIdentifier::unsafe_offset(); 3229 JVM_END 3230 3231 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3232 ThreadsListHandle tlh(thread); 3233 JavaThread* receiver = nullptr; 3234 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3235 if (is_alive) { 3236 // jthread refers to a live JavaThread. 3237 receiver->interrupt(); 3238 } 3239 JVM_END 3240 3241 // Return true iff the current thread has locked the object passed in 3242 3243 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3244 if (obj == nullptr) { 3245 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3246 } 3247 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3248 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3249 JVM_END 3250 3251 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3252 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD); 3253 return JNIHandles::make_local(THREAD, trace); 3254 JVM_END 3255 3256 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3257 VM_PrintThreads op; 3258 VMThread::execute(&op); 3259 if (JvmtiExport::should_post_data_dump()) { 3260 JvmtiExport::post_data_dump(); 3261 } 3262 JVM_END 3263 3264 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3265 // We don't use a ThreadsListHandle here because the current thread 3266 // must be alive. 3267 oop java_thread = JNIHandles::resolve_non_null(jthread); 3268 JavaThread* thr = java_lang_Thread::thread(java_thread); 3269 if (thread == thr && !thr->has_attached_via_jni()) { 3270 // Thread naming is only supported for the current thread and 3271 // we don't set the name of an attached thread to avoid stepping 3272 // on other programs. 3273 ResourceMark rm(thread); 3274 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3275 os::set_native_thread_name(thread_name); 3276 } 3277 JVM_END 3278 3279 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3280 oop theCache = thread->scopedValueCache(); 3281 return JNIHandles::make_local(THREAD, theCache); 3282 JVM_END 3283 3284 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3285 jobject theCache)) 3286 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3287 thread->set_scopedValueCache(objs); 3288 JVM_END 3289 3290 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3291 3292 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3293 ResourceMark rm(THREAD); 3294 JvmtiVMObjectAllocEventCollector oam; 3295 vframeStream vfst(thread); 3296 3297 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) { 3298 // This must only be called from SecurityManager.getClassContext 3299 Method* m = vfst.method(); 3300 if (!(m->method_holder() == vmClasses::SecurityManager_klass() && 3301 m->name() == vmSymbols::getClassContext_name() && 3302 m->signature() == vmSymbols::void_class_array_signature())) { 3303 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3304 } 3305 } 3306 3307 // Collect method holders 3308 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3309 for (; !vfst.at_end(); vfst.security_next()) { 3310 Method* m = vfst.method(); 3311 // Native frames are not returned 3312 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3313 Klass* holder = m->method_holder(); 3314 assert(holder->is_klass(), "just checking"); 3315 klass_array->append(holder); 3316 } 3317 } 3318 3319 // Create result array of type [Ljava/lang/Class; 3320 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL); 3321 // Fill in mirrors corresponding to method holders 3322 for (int i = 0; i < klass_array->length(); i++) { 3323 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3324 } 3325 3326 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3327 JVM_END 3328 3329 3330 // java.lang.Package //////////////////////////////////////////////////////////////// 3331 3332 3333 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3334 ResourceMark rm(THREAD); 3335 JvmtiVMObjectAllocEventCollector oam; 3336 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3337 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3338 return (jstring) JNIHandles::make_local(THREAD, result); 3339 JVM_END 3340 3341 3342 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3343 JvmtiVMObjectAllocEventCollector oam; 3344 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3345 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3346 JVM_END 3347 3348 3349 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3350 3351 3352 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3353 MonitorLocker ml(Heap_lock); 3354 oop ref = Universe::reference_pending_list(); 3355 if (ref != nullptr) { 3356 Universe::clear_reference_pending_list(); 3357 } 3358 return JNIHandles::make_local(THREAD, ref); 3359 JVM_END 3360 3361 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3362 MonitorLocker ml(Heap_lock); 3363 return Universe::has_reference_pending_list(); 3364 JVM_END 3365 3366 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3367 MonitorLocker ml(Heap_lock); 3368 while (!Universe::has_reference_pending_list()) { 3369 ml.wait(); 3370 } 3371 JVM_END 3372 3373 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3374 oop ref_oop = JNIHandles::resolve_non_null(ref); 3375 // PhantomReference has it's own implementation of refersTo(). 3376 // See: JVM_PhantomReferenceRefersTo 3377 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3378 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3379 return referent == JNIHandles::resolve(o); 3380 JVM_END 3381 3382 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3383 oop ref_oop = JNIHandles::resolve_non_null(ref); 3384 // FinalReference has it's own implementation of clear(). 3385 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3386 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3387 // If the referent has already been cleared then done. 3388 // However, if the referent is dead but has not yet been cleared by 3389 // concurrent reference processing, it should NOT be cleared here. 3390 // Instead, clearing should be left to the GC. Clearing it here could 3391 // detectably lose an expected notification, which is impossible with 3392 // STW reference processing. The clearing in enqueue() doesn't have 3393 // this problem, since the enqueue covers the notification, but it's not 3394 // worth the effort to handle that case specially. 3395 return; 3396 } 3397 java_lang_ref_Reference::clear_referent(ref_oop); 3398 JVM_END 3399 3400 3401 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3402 3403 3404 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3405 oop ref_oop = JNIHandles::resolve_non_null(ref); 3406 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3407 return referent == JNIHandles::resolve(o); 3408 JVM_END 3409 3410 3411 // ObjectInputStream /////////////////////////////////////////////////////////////// 3412 3413 // Return the first user-defined class loader up the execution stack, or null 3414 // if only code from the bootstrap or platform class loader is on the stack. 3415 3416 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3417 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3418 InstanceKlass* ik = vfst.method()->method_holder(); 3419 oop loader = ik->class_loader(); 3420 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3421 // Skip reflection related frames 3422 if (!ik->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) { 3423 return JNIHandles::make_local(THREAD, loader); 3424 } 3425 } 3426 } 3427 return nullptr; 3428 JVM_END 3429 3430 3431 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3432 3433 3434 // resolve array handle and check arguments 3435 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3436 if (arr == nullptr) { 3437 THROW_0(vmSymbols::java_lang_NullPointerException()); 3438 } 3439 oop a = JNIHandles::resolve_non_null(arr); 3440 if (!a->is_array()) { 3441 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3442 } else if (type_array_only && !a->is_typeArray()) { 3443 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3444 } 3445 return arrayOop(a); 3446 } 3447 3448 3449 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3450 arrayOop a = check_array(env, arr, false, CHECK_0); 3451 return a->length(); 3452 JVM_END 3453 3454 3455 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3456 JvmtiVMObjectAllocEventCollector oam; 3457 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3458 jvalue value; 3459 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3460 oop box = Reflection::box(&value, type, CHECK_NULL); 3461 return JNIHandles::make_local(THREAD, box); 3462 JVM_END 3463 3464 3465 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3466 jvalue value; 3467 value.i = 0; // to initialize value before getting used in CHECK 3468 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3469 assert(a->is_typeArray(), "just checking"); 3470 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3471 BasicType wide_type = (BasicType) wCode; 3472 if (type != wide_type) { 3473 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3474 } 3475 return value; 3476 JVM_END 3477 3478 3479 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3480 arrayOop a = check_array(env, arr, false, CHECK); 3481 oop box = JNIHandles::resolve(val); 3482 jvalue value; 3483 value.i = 0; // to initialize value before getting used in CHECK 3484 BasicType value_type; 3485 if (a->is_objArray()) { 3486 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3487 value_type = Reflection::unbox_for_regular_object(box, &value); 3488 } else { 3489 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3490 } 3491 Reflection::array_set(&value, a, index, value_type, CHECK); 3492 JVM_END 3493 3494 3495 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3496 arrayOop a = check_array(env, arr, true, CHECK); 3497 assert(a->is_typeArray(), "just checking"); 3498 BasicType value_type = (BasicType) vCode; 3499 Reflection::array_set(&v, a, index, value_type, CHECK); 3500 JVM_END 3501 3502 3503 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3504 JvmtiVMObjectAllocEventCollector oam; 3505 oop element_mirror = JNIHandles::resolve(eltClass); 3506 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3507 return JNIHandles::make_local(THREAD, result); 3508 JVM_END 3509 3510 3511 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3512 JvmtiVMObjectAllocEventCollector oam; 3513 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3514 oop element_mirror = JNIHandles::resolve(eltClass); 3515 assert(dim_array->is_typeArray(), "just checking"); 3516 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3517 return JNIHandles::make_local(THREAD, result); 3518 JVM_END 3519 3520 3521 // Library support /////////////////////////////////////////////////////////////////////////// 3522 3523 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3524 return ZipLibrary::handle(); 3525 JVM_END 3526 3527 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3528 //%note jvm_ct 3529 char ebuf[1024]; 3530 void *load_result; 3531 { 3532 ThreadToNativeFromVM ttnfvm(thread); 3533 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3534 } 3535 if (load_result == nullptr) { 3536 if (throwException) { 3537 char msg[1024]; 3538 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3539 // Since 'ebuf' may contain a string encoded using 3540 // platform encoding scheme, we need to pass 3541 // Exceptions::unsafe_to_utf8 to the new_exception method 3542 // as the last argument. See bug 6367357. 3543 Handle h_exception = 3544 Exceptions::new_exception(thread, 3545 vmSymbols::java_lang_UnsatisfiedLinkError(), 3546 msg, Exceptions::unsafe_to_utf8); 3547 3548 THROW_HANDLE_0(h_exception); 3549 } else { 3550 log_info(library)("Failed to load library %s", name); 3551 return load_result; 3552 } 3553 } 3554 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3555 return load_result; 3556 JVM_END 3557 3558 3559 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3560 os::dll_unload(handle); 3561 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3562 JVM_END 3563 3564 3565 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3566 void* find_result = os::dll_lookup(handle, name); 3567 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3568 find_result != nullptr ? "Found" : "Failed to find", 3569 name, p2i(handle)); 3570 return find_result; 3571 JVM_END 3572 3573 3574 // JNI version /////////////////////////////////////////////////////////////////////////////// 3575 3576 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3577 return Threads::is_supported_jni_version_including_1_1(version); 3578 JVM_END 3579 3580 3581 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3582 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3583 JVM_END 3584 3585 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void)) 3586 return EnableValhalla ? JNI_TRUE : JNI_FALSE; 3587 JVM_END 3588 3589 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3590 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3591 JVM_END 3592 3593 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void)) 3594 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE; 3595 JVM_END 3596 3597 // String support /////////////////////////////////////////////////////////////////////////// 3598 3599 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3600 JvmtiVMObjectAllocEventCollector oam; 3601 if (str == nullptr) return nullptr; 3602 oop string = JNIHandles::resolve_non_null(str); 3603 oop result = StringTable::intern(string, CHECK_NULL); 3604 return (jstring) JNIHandles::make_local(THREAD, result); 3605 JVM_END 3606 3607 3608 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3609 3610 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3611 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3612 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3613 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3614 // nature. JavaThreads will be "in native" when using this API from JDK code. 3615 3616 3617 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3618 VM_Exit::block_if_vm_exited(); 3619 return new PlatformMutex(); 3620 } 3621 3622 3623 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3624 VM_Exit::block_if_vm_exited(); 3625 delete ((PlatformMutex*) mon); 3626 } 3627 3628 3629 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3630 VM_Exit::block_if_vm_exited(); 3631 ((PlatformMutex*) mon)->lock(); 3632 return 0; 3633 } 3634 3635 3636 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3637 VM_Exit::block_if_vm_exited(); 3638 ((PlatformMutex*) mon)->unlock(); 3639 } 3640 3641 3642 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3643 3644 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3645 Handle loader, Handle protection_domain, 3646 jboolean throwError, TRAPS) { 3647 // Security Note: 3648 // The Java level wrapper will perform the necessary security check allowing 3649 // us to pass the null as the initiating class loader. The VM is responsible for 3650 // the checkPackageAccess relative to the initiating class loader via the 3651 // protection_domain. The protection_domain is passed as null by the java code 3652 // if there is no security manager in 3-arg Class.forName(). 3653 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3654 3655 // Check if we should initialize the class 3656 if (init && klass->is_instance_klass()) { 3657 klass->initialize(CHECK_NULL); 3658 } 3659 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3660 } 3661 3662 3663 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3664 3665 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3666 Handle method_handle; 3667 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3668 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3669 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3670 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL); 3671 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3672 jobject res = JNIHandles::make_local(THREAD, result); 3673 if (JvmtiExport::should_post_vm_object_alloc()) { 3674 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3675 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3676 if (java_lang_Class::is_primitive(ret_type)) { 3677 // Only for primitive type vm allocates memory for java object. 3678 // See box() method. 3679 JvmtiExport::post_vm_object_alloc(thread, result); 3680 } 3681 } 3682 return res; 3683 } else { 3684 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3685 } 3686 JVM_END 3687 3688 3689 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3690 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL); 3691 oop constructor_mirror = JNIHandles::resolve(c); 3692 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3693 jobject res = JNIHandles::make_local(THREAD, result); 3694 if (JvmtiExport::should_post_vm_object_alloc()) { 3695 JvmtiExport::post_vm_object_alloc(thread, result); 3696 } 3697 return res; 3698 JVM_END 3699 3700 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3701 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3702 assert(k->is_klass(), "just checking"); 3703 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3704 JVM_END 3705 3706 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3707 jclass caller, 3708 jstring interfaceMethodName, 3709 jobject factoryType, 3710 jobject interfaceMethodType, 3711 jobject implementationMember, 3712 jobject dynamicMethodType, 3713 jclass lambdaProxyClass)) 3714 #if INCLUDE_CDS 3715 if (!CDSConfig::is_dumping_archive()) { 3716 return; 3717 } 3718 3719 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3720 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3721 if (caller_ik->is_hidden()) { 3722 // Hidden classes not of type lambda proxy classes are currently not being archived. 3723 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3724 // registered for archiving. 3725 return; 3726 } 3727 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass)); 3728 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k); 3729 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3730 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3731 3732 Symbol* interface_method_name = nullptr; 3733 if (interfaceMethodName != nullptr) { 3734 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3735 } 3736 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3737 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3738 3739 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3740 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3741 3742 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3743 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3744 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3745 3746 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3747 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3748 3749 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3750 interface_method_type, m, dynamic_method_type, THREAD); 3751 #endif // INCLUDE_CDS 3752 JVM_END 3753 3754 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3755 jclass caller, 3756 jstring interfaceMethodName, 3757 jobject factoryType, 3758 jobject interfaceMethodType, 3759 jobject implementationMember, 3760 jobject dynamicMethodType)) 3761 #if INCLUDE_CDS 3762 3763 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3764 implementationMember == nullptr || dynamicMethodType == nullptr) { 3765 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3766 } 3767 3768 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3769 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3770 if (!caller_ik->is_shared()) { 3771 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3772 return nullptr; 3773 } 3774 3775 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3776 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3777 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3778 3779 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3780 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3781 3782 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3783 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3784 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3785 3786 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3787 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3788 3789 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3790 interface_method_type, m, dynamic_method_type); 3791 jclass jcls = nullptr; 3792 if (lambda_ik != nullptr) { 3793 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD); 3794 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3795 } 3796 return jcls; 3797 #else 3798 return nullptr; 3799 #endif // INCLUDE_CDS 3800 JVM_END 3801 3802 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env)) 3803 return CDSConfig::is_dumping_archive(); 3804 JVM_END 3805 3806 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env)) 3807 return UseSharedSpaces; 3808 JVM_END 3809 3810 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3811 if (CDSConfig::is_dumping_static_archive()) { 3812 // We do this so that the default CDS archive can be deterministic. 3813 const char* release = VM_Version::vm_release(); 3814 const char* dbg_level = VM_Version::jdk_debug_level(); 3815 const char* version = VM_Version::internal_vm_info_string(); 3816 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3817 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3818 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3819 seed += (jlong)VM_Version::vm_major_version(); 3820 seed += (jlong)VM_Version::vm_minor_version(); 3821 seed += (jlong)VM_Version::vm_security_version(); 3822 seed += (jlong)VM_Version::vm_patch_version(); 3823 if (seed == 0) { // don't let this ever be zero. 3824 seed = 0x87654321; 3825 } 3826 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3827 return seed; 3828 } else { 3829 return 0; 3830 } 3831 JVM_END 3832 3833 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env)) 3834 #if INCLUDE_CDS 3835 return ClassListWriter::is_enabled() || CDSConfig::is_dumping_dynamic_archive(); 3836 #else 3837 return false; 3838 #endif // INCLUDE_CDS 3839 JVM_END 3840 3841 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3842 #if INCLUDE_CDS 3843 assert(ClassListWriter::is_enabled() || CDSConfig::is_dumping_dynamic_archive(), "Should be set and open or do dynamic dump"); 3844 if (line != nullptr) { 3845 ResourceMark rm(THREAD); 3846 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3847 char* c_line = java_lang_String::as_utf8_string(h_line()); 3848 if (CDSConfig::is_dumping_dynamic_archive()) { 3849 // Note: LambdaFormInvokers::append take same format which is not 3850 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3851 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3852 } 3853 if (ClassListWriter::is_enabled()) { 3854 ClassListWriter w; 3855 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line); 3856 } 3857 } 3858 #endif // INCLUDE_CDS 3859 JVM_END 3860 3861 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3862 #if INCLUDE_CDS 3863 ResourceMark rm(THREAD); 3864 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3865 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3866 MetaspaceShared::dump_loaded_classes(file_name, THREAD); 3867 #endif // INCLUDE_CDS 3868 JVM_END 3869 3870 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3871 #if INCLUDE_CDS 3872 ResourceMark rm(THREAD); 3873 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3874 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3875 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3876 #endif // INCLUDE_CDS 3877 JVM_END 3878 3879 // Returns an array of all live Thread objects (VM internal JavaThreads, 3880 // jvmti agent threads, and JNI attaching threads are skipped) 3881 // See CR 6404306 regarding JNI attaching threads 3882 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3883 ResourceMark rm(THREAD); 3884 ThreadsListEnumerator tle(THREAD, false, false); 3885 JvmtiVMObjectAllocEventCollector oam; 3886 3887 int num_threads = tle.num_threads(); 3888 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3889 objArrayHandle threads_ah(THREAD, r); 3890 3891 for (int i = 0; i < num_threads; i++) { 3892 Handle h = tle.get_threadObj(i); 3893 threads_ah->obj_at_put(i, h()); 3894 } 3895 3896 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3897 JVM_END 3898 3899 3900 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3901 // Return StackTraceElement[][], each element is the stack trace of a thread in 3902 // the corresponding entry in the given threads array 3903 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3904 JvmtiVMObjectAllocEventCollector oam; 3905 3906 // Check if threads is null 3907 if (threads == nullptr) { 3908 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3909 } 3910 3911 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3912 objArrayHandle ah(THREAD, a); 3913 int num_threads = ah->length(); 3914 // check if threads is non-empty array 3915 if (num_threads == 0) { 3916 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3917 } 3918 3919 // check if threads is not an array of objects of Thread class 3920 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3921 if (k != vmClasses::Thread_klass()) { 3922 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3923 } 3924 3925 ResourceMark rm(THREAD); 3926 3927 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3928 for (int i = 0; i < num_threads; i++) { 3929 oop thread_obj = ah->obj_at(i); 3930 instanceHandle h(THREAD, (instanceOop) thread_obj); 3931 thread_handle_array->append(h); 3932 } 3933 3934 // The JavaThread references in thread_handle_array are validated 3935 // in VM_ThreadDump::doit(). 3936 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3937 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3938 3939 JVM_END 3940 3941 // JVM monitoring and management support 3942 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3943 return Management::get_jmm_interface(version); 3944 JVM_END 3945 3946 // com.sun.tools.attach.VirtualMachine agent properties support 3947 // 3948 // Initialize the agent properties with the properties maintained in the VM 3949 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3950 ResourceMark rm; 3951 3952 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3953 3954 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3955 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3956 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3957 return properties; 3958 JVM_END 3959 3960 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3961 { 3962 JvmtiVMObjectAllocEventCollector oam; 3963 3964 if (ofClass == nullptr) { 3965 return nullptr; 3966 } 3967 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3968 // Special handling for primitive objects 3969 if (java_lang_Class::is_primitive(mirror())) { 3970 return nullptr; 3971 } 3972 Klass* k = java_lang_Class::as_Klass(mirror()); 3973 if (!k->is_instance_klass()) { 3974 return nullptr; 3975 } 3976 InstanceKlass* ik = InstanceKlass::cast(k); 3977 int encl_method_class_idx = ik->enclosing_method_class_index(); 3978 if (encl_method_class_idx == 0) { 3979 return nullptr; 3980 } 3981 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3982 objArrayHandle dest(THREAD, dest_o); 3983 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3984 dest->obj_at_put(0, enc_k->java_mirror()); 3985 int encl_method_method_idx = ik->enclosing_method_method_index(); 3986 if (encl_method_method_idx != 0) { 3987 Symbol* sym = ik->constants()->symbol_at( 3988 extract_low_short_from_int( 3989 ik->constants()->name_and_type_at(encl_method_method_idx))); 3990 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3991 dest->obj_at_put(1, str()); 3992 sym = ik->constants()->symbol_at( 3993 extract_high_short_from_int( 3994 ik->constants()->name_and_type_at(encl_method_method_idx))); 3995 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3996 dest->obj_at_put(2, str()); 3997 } 3998 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3999 } 4000 JVM_END 4001 4002 // Returns an array of java.lang.String objects containing the input arguments to the VM. 4003 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 4004 ResourceMark rm(THREAD); 4005 4006 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 4007 return nullptr; 4008 } 4009 4010 char** vm_flags = Arguments::jvm_flags_array(); 4011 char** vm_args = Arguments::jvm_args_array(); 4012 int num_flags = Arguments::num_jvm_flags(); 4013 int num_args = Arguments::num_jvm_args(); 4014 4015 InstanceKlass* ik = vmClasses::String_klass(); 4016 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 4017 objArrayHandle result_h(THREAD, r); 4018 4019 int index = 0; 4020 for (int j = 0; j < num_flags; j++, index++) { 4021 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 4022 result_h->obj_at_put(index, h()); 4023 } 4024 for (int i = 0; i < num_args; i++, index++) { 4025 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 4026 result_h->obj_at_put(index, h()); 4027 } 4028 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 4029 JVM_END 4030 4031 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 4032 return os::get_signal_number(name); 4033 JVM_END 4034 4035 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread)) 4036 #if INCLUDE_JVMTI 4037 if (!DoJVMTIVirtualThreadTransitions) { 4038 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4039 return; 4040 } 4041 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4042 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread); 4043 } else { 4044 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4045 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false); 4046 } 4047 #else 4048 fatal("Should only be called with JVMTI enabled"); 4049 #endif 4050 JVM_END 4051 4052 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread)) 4053 #if INCLUDE_JVMTI 4054 if (!DoJVMTIVirtualThreadTransitions) { 4055 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4056 return; 4057 } 4058 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4059 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread); 4060 } else { 4061 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4062 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true); 4063 } 4064 #else 4065 fatal("Should only be called with JVMTI enabled"); 4066 #endif 4067 JVM_END 4068 4069 // If notifications are disabled then just update the VTMS transition bit and return. 4070 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call. 4071 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide)) 4072 #if INCLUDE_JVMTI 4073 if (!DoJVMTIVirtualThreadTransitions) { 4074 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4075 return; 4076 } 4077 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4078 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide); 4079 } else { 4080 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4081 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 4082 } 4083 #else 4084 fatal("Should only be called with JVMTI enabled"); 4085 #endif 4086 JVM_END 4087 4088 // If notifications are disabled then just update the VTMS transition bit and return. 4089 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below. 4090 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide)) 4091 #if INCLUDE_JVMTI 4092 if (!DoJVMTIVirtualThreadTransitions) { 4093 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4094 return; 4095 } 4096 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 4097 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide); 4098 } else { 4099 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 4100 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 4101 } 4102 #else 4103 fatal("Should only be called with JVMTI enabled"); 4104 #endif 4105 JVM_END 4106 4107 // Always update the temporary VTMS transition bit. 4108 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jobject vthread, jboolean hide)) 4109 #if INCLUDE_JVMTI 4110 if (!DoJVMTIVirtualThreadTransitions) { 4111 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4112 return; 4113 } 4114 assert(!thread->is_in_VTMS_transition(), "sanity check"); 4115 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check"); 4116 thread->toggle_is_in_tmp_VTMS_transition(); 4117 #else 4118 fatal("Should only be called with JVMTI enabled"); 4119 #endif 4120 JVM_END 4121 4122 /* 4123 * Return the current class's class file version. The low order 16 bits of the 4124 * returned jint contain the class's major version. The high order 16 bits 4125 * contain the class's minor version. 4126 */ 4127 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 4128 oop mirror = JNIHandles::resolve_non_null(current); 4129 if (java_lang_Class::is_primitive(mirror)) { 4130 // return latest major version and minor version of 0. 4131 return JVM_CLASSFILE_MAJOR_VERSION; 4132 } 4133 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class"); 4134 4135 Klass* c = java_lang_Class::as_Klass(mirror); 4136 assert(c->is_instance_klass(), "must be"); 4137 InstanceKlass* ik = InstanceKlass::cast(c); 4138 return (ik->minor_version() << 16) | ik->major_version(); 4139 JVM_END 4140 4141 /* 4142 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 4143 * get the value will see a materialized value and not a scalar-replaced 4144 * null value. 4145 */ 4146 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 4147 JVM_EnsureMaterializedForStackWalk(env, value); 4148 JVM_END 4149 4150 /* 4151 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded. 4152 */ 4153 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void)) 4154 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE; 4155 JVM_END