1 /* 2 * Copyright (c) 1997, 2026, 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 "cds/aotClassInitializer.hpp" 26 #include "cds/aotMetaspace.hpp" 27 #include "cds/cdsConfig.hpp" 28 #include "cds/classListParser.hpp" 29 #include "cds/classListWriter.hpp" 30 #include "cds/dynamicArchive.hpp" 31 #include "cds/heapShared.hpp" 32 #include "cds/lambdaFormInvokers.hpp" 33 #include "cds/lambdaProxyClassDictionary.hpp" 34 #include "classfile/classFileStream.hpp" 35 #include "classfile/classLoader.inline.hpp" 36 #include "classfile/classLoaderData.inline.hpp" 37 #include "classfile/classLoadInfo.hpp" 38 #include "classfile/javaAssertions.hpp" 39 #include "classfile/javaClasses.inline.hpp" 40 #include "classfile/moduleEntry.hpp" 41 #include "classfile/modules.hpp" 42 #include "classfile/packageEntry.hpp" 43 #include "classfile/stringTable.hpp" 44 #include "classfile/symbolTable.hpp" 45 #include "classfile/systemDictionary.hpp" 46 #include "classfile/vmClasses.hpp" 47 #include "classfile/vmSymbols.hpp" 48 #include "gc/shared/collectedHeap.inline.hpp" 49 #include "interpreter/bytecode.hpp" 50 #include "interpreter/bytecodeUtils.hpp" 51 #include "jfr/jfrEvents.hpp" 52 #include "jvm.h" 53 #include "logging/log.hpp" 54 #include "memory/oopFactory.hpp" 55 #include "memory/referenceType.hpp" 56 #include "memory/resourceArea.hpp" 57 #include "memory/universe.hpp" 58 #include "oops/access.inline.hpp" 59 #include "oops/constantPool.hpp" 60 #include "oops/fieldStreams.inline.hpp" 61 #include "oops/flatArrayKlass.hpp" 62 #include "oops/inlineKlass.inline.hpp" 63 #include "oops/instanceKlass.hpp" 64 #include "oops/klass.inline.hpp" 65 #include "oops/method.hpp" 66 #include "oops/objArrayKlass.hpp" 67 #include "oops/objArrayOop.inline.hpp" 68 #include "oops/oop.inline.hpp" 69 #include "oops/oopCast.inline.hpp" 70 #include "oops/recordComponent.hpp" 71 #include "oops/refArrayOop.inline.hpp" 72 #include "oops/valuePayload.inline.hpp" 73 #include "prims/foreignGlobals.hpp" 74 #include "prims/jvm_misc.hpp" 75 #include "prims/jvmtiExport.hpp" 76 #include "prims/jvmtiThreadState.inline.hpp" 77 #include "prims/stackwalk.hpp" 78 #include "runtime/arguments.hpp" 79 #include "runtime/atomicAccess.hpp" 80 #include "runtime/continuation.hpp" 81 #include "runtime/deoptimization.hpp" 82 #include "runtime/globals_extension.hpp" 83 #include "runtime/handles.inline.hpp" 84 #include "runtime/handshake.hpp" 85 #include "runtime/init.hpp" 86 #include "runtime/interfaceSupport.inline.hpp" 87 #include "runtime/java.hpp" 88 #include "runtime/javaCalls.hpp" 89 #include "runtime/javaThread.hpp" 90 #include "runtime/jfieldIDWorkaround.hpp" 91 #include "runtime/jniHandles.inline.hpp" 92 #include "runtime/mountUnmountDisabler.hpp" 93 #include "runtime/os.inline.hpp" 94 #include "runtime/osThread.hpp" 95 #include "runtime/perfData.hpp" 96 #include "runtime/reflection.hpp" 97 #include "runtime/synchronizer.hpp" 98 #include "runtime/threadIdentifier.hpp" 99 #include "runtime/threadSMR.hpp" 100 #include "runtime/vframe.inline.hpp" 101 #include "runtime/vm_version.hpp" 102 #include "runtime/vmOperations.hpp" 103 #include "services/attachListener.hpp" 104 #include "services/management.hpp" 105 #include "services/threadService.hpp" 106 #include "utilities/checkedCast.hpp" 107 #include "utilities/copy.hpp" 108 #include "utilities/defaultStream.hpp" 109 #include "utilities/dtrace.hpp" 110 #include "utilities/events.hpp" 111 #include "utilities/macros.hpp" 112 #include "utilities/utf8.hpp" 113 #include "utilities/zipLibrary.hpp" 114 #if INCLUDE_CDS 115 #include "classfile/systemDictionaryShared.hpp" 116 #endif 117 #if INCLUDE_JFR 118 #include "jfr/jfr.hpp" 119 #endif 120 #if INCLUDE_MANAGEMENT 121 #include "services/finalizerService.hpp" 122 #endif 123 124 #include <errno.h> 125 126 /* 127 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 128 such ctors and calls MUST NOT come between an oop declaration/init and its 129 usage because if objects are move this may cause various memory stomps, bus 130 errors and segfaults. Here is a cookbook for causing so called "naked oop 131 failures": 132 133 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 134 // Object address to be held directly in mirror & not visible to GC 135 oop mirror = JNIHandles::resolve_non_null(ofClass); 136 137 // If this ctor can hit a safepoint, moving objects around, then 138 ComplexConstructor foo; 139 140 // Boom! mirror may point to JUNK instead of the intended object 141 (some dereference of mirror) 142 143 // Here's another call that may block for GC, making mirror stale 144 MutexLocker ml(some_lock); 145 146 // And here's an initializer that can result in a stale oop 147 // all in one step. 148 oop o = call_that_can_throw_exception(TRAPS); 149 150 151 The solution is to keep the oop declaration BELOW the ctor or function 152 call that might cause a GC, do another resolve to reassign the oop, or 153 consider use of a Handle instead of an oop so there is immunity from object 154 motion. But note that the "QUICK" entries below do not have a handlemark 155 and thus can only support use of handles passed in. 156 */ 157 158 extern void trace_class_resolution(Klass* to_class) { 159 ResourceMark rm; 160 int line_number = -1; 161 const char * source_file = nullptr; 162 const char * trace = "explicit"; 163 InstanceKlass* caller = nullptr; 164 JavaThread* jthread = JavaThread::current(); 165 if (jthread->has_last_Java_frame()) { 166 vframeStream vfst(jthread); 167 168 // Scan up the stack skipping ClassLoader frames. 169 Method* last_caller = nullptr; 170 171 while (!vfst.at_end()) { 172 Method* m = vfst.method(); 173 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) { 174 break; 175 } 176 last_caller = m; 177 vfst.next(); 178 } 179 // if this is called from Class.forName0 and that is called from Class.forName, 180 // then print the caller of Class.forName. If this is Class.loadClass, then print 181 // that caller, otherwise keep quiet since this should be picked up elsewhere. 182 bool found_it = false; 183 if (!vfst.at_end() && 184 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 185 vfst.method()->name() == vmSymbols::forName0_name()) { 186 vfst.next(); 187 if (!vfst.at_end() && 188 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 189 vfst.method()->name() == vmSymbols::forName_name()) { 190 vfst.next(); 191 found_it = true; 192 } 193 } else if (last_caller != nullptr && 194 last_caller->method_holder()->name() == 195 vmSymbols::java_lang_ClassLoader() && 196 last_caller->name() == vmSymbols::loadClass_name()) { 197 found_it = true; 198 } else if (!vfst.at_end()) { 199 if (vfst.method()->is_native()) { 200 // JNI call 201 found_it = true; 202 } 203 } 204 if (found_it && !vfst.at_end()) { 205 // found the caller 206 caller = vfst.method()->method_holder(); 207 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 208 if (line_number == -1) { 209 // show method name if it's a native method 210 trace = vfst.method()->name_and_sig_as_C_string(); 211 } 212 Symbol* s = caller->source_file_name(); 213 if (s != nullptr) { 214 source_file = s->as_C_string(); 215 } 216 } 217 } 218 if (caller != nullptr) { 219 if (to_class != caller) { 220 const char * from = caller->external_name(); 221 const char * to = to_class->external_name(); 222 // print in a single call to reduce interleaving between threads 223 if (source_file != nullptr) { 224 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 225 } else { 226 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 227 } 228 } 229 } 230 } 231 232 // java.lang.System ////////////////////////////////////////////////////////////////////// 233 234 JVM_ENTRY(jboolean, JVM_AOTEndRecording(JNIEnv *env)) 235 #if INCLUDE_CDS 236 if (CDSConfig::is_dumping_preimage_static_archive()) { 237 if (!AOTMetaspace::preimage_static_archive_dumped()) { 238 AOTMetaspace::dump_static_archive(THREAD); 239 return JNI_TRUE; 240 } 241 } 242 return JNI_FALSE; 243 #else 244 return JNI_FALSE; 245 #endif // INCLUDE_CDS 246 JVM_END 247 248 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 249 return os::javaTimeMillis(); 250 JVM_END 251 252 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 253 return os::javaTimeNanos(); 254 JVM_END 255 256 // The function below is actually exposed by jdk.internal.misc.VM and not 257 // java.lang.System, but we choose to keep it here so that it stays next 258 // to JVM_CurrentTimeMillis and JVM_NanoTime 259 260 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 261 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 262 263 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 264 jlong seconds; 265 jlong nanos; 266 267 os::javaTimeSystemUTC(seconds, nanos); 268 269 // We're going to verify that the result can fit in a long. 270 // For that we need the difference in seconds between 'seconds' 271 // and 'offset_secs' to be such that: 272 // |seconds - offset_secs| < (2^63/10^9) 273 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 274 // which makes |seconds - offset_secs| < 2^33 275 // and we will prefer +/- 2^32 as the maximum acceptable diff 276 // as 2^32 has a more natural feel than 2^33... 277 // 278 // So if |seconds - offset_secs| >= 2^32 - we return a special 279 // sentinel value (-1) which the caller should take as an 280 // exception value indicating that the offset given to us is 281 // too far from range of the current time - leading to too big 282 // a nano adjustment. The caller is expected to recover by 283 // computing a more accurate offset and calling this method 284 // again. (For the record 2^32 secs is ~136 years, so that 285 // should rarely happen) 286 // 287 jlong diff = seconds - offset_secs; 288 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 289 return -1; // sentinel value: the offset is too far off the target 290 } 291 292 // return the adjustment. If you compute a time by adding 293 // this number of nanoseconds along with the number of seconds 294 // in the offset you should get the current UTC time. 295 return (diff * (jlong)1000000000) + nanos; 296 JVM_END 297 298 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 299 jobject dst, jint dst_pos, jint length)) 300 // Check if we have null pointers 301 if (src == nullptr || dst == nullptr) { 302 THROW(vmSymbols::java_lang_NullPointerException()); 303 } 304 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 305 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 306 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 307 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 308 // Do copy 309 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 310 JVM_END 311 312 313 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 314 JavaValue r(T_OBJECT); 315 // public synchronized Object put(Object key, Object value); 316 HandleMark hm(THREAD); 317 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 318 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK); 319 JavaCalls::call_virtual(&r, 320 props, 321 vmClasses::Properties_klass(), 322 vmSymbols::put_name(), 323 vmSymbols::object_object_object_signature(), 324 key_str, 325 value_str, 326 THREAD); 327 } 328 329 330 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 331 332 /* 333 * Return all of the system properties in a Java String array with alternating 334 * names and values from the jvm SystemProperty. 335 * Which includes some internal and all commandline -D defined properties. 336 */ 337 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 338 ResourceMark rm(THREAD); 339 HandleMark hm(THREAD); 340 int ndx = 0; 341 int fixedCount = 2; 342 343 SystemProperty* p = Arguments::system_properties(); 344 int count = Arguments::PropertyList_count(p); 345 346 // Allocate result String array 347 InstanceKlass* ik = vmClasses::String_klass(); 348 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 349 objArrayHandle result_h(THREAD, r); 350 351 while (p != nullptr) { 352 const char * key = p->key(); 353 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 354 const char * value = p->value(); 355 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 356 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL); 357 result_h->obj_at_put(ndx * 2, key_str()); 358 result_h->obj_at_put(ndx * 2 + 1, value_str()); 359 ndx++; 360 } 361 p = p->next(); 362 } 363 364 // Convert the -XX:MaxDirectMemorySize= command line flag 365 // to the sun.nio.MaxDirectMemorySize property. 366 // Do this after setting user properties to prevent people 367 // from setting the value with a -D option, as requested. 368 // Leave empty if not supplied 369 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 370 char as_chars[256]; 371 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 372 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 373 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 374 result_h->obj_at_put(ndx * 2, key_str()); 375 result_h->obj_at_put(ndx * 2 + 1, value_str()); 376 ndx++; 377 } 378 379 // JVM monitoring and management support 380 // Add the sun.management.compiler property for the compiler's name 381 { 382 #undef CSIZE 383 #if defined(_LP64) 384 #define CSIZE "64-Bit " 385 #else 386 #define CSIZE 387 #endif // 64bit 388 389 #if COMPILER1_AND_COMPILER2 390 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 391 #else 392 #if defined(COMPILER1) 393 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 394 #elif defined(COMPILER2) 395 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 396 #else 397 const char* compiler_name = ""; 398 #endif // compilers 399 #endif // COMPILER1_AND_COMPILER2 400 401 if (*compiler_name != '\0' && 402 (Arguments::mode() != Arguments::_int)) { 403 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 404 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 405 result_h->obj_at_put(ndx * 2, key_str()); 406 result_h->obj_at_put(ndx * 2 + 1, value_str()); 407 ndx++; 408 } 409 } 410 411 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 412 JVM_END 413 414 415 /* 416 * Return the temporary directory that the VM uses for the attach 417 * and perf data files. 418 * 419 * It is important that this directory is well-known and the 420 * same for all VM instances. It cannot be affected by configuration 421 * variables such as java.io.tmpdir. 422 */ 423 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 424 HandleMark hm(THREAD); 425 const char* temp_dir = os::get_temp_directory(); 426 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 427 return (jstring) JNIHandles::make_local(THREAD, h()); 428 JVM_END 429 430 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) { 431 if (len < 0) { 432 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative"); 433 } 434 elmClass->initialize(CHECK); 435 if (elmClass->is_array_klass() || elmClass->is_identity_class()) { 436 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class"); 437 } 438 if (elmClass->is_abstract()) { 439 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract"); 440 } 441 } 442 443 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to)) 444 oop o = JNIHandles::resolve_non_null(orig); 445 assert(o->is_array(), "Must be"); 446 oop array = nullptr; 447 arrayOop org = (arrayOop)o; 448 arrayHandle oh(THREAD, org); 449 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass()); 450 InlineKlass* vk = InlineKlass::cast(ak->element_klass()); 451 int len = to - from; // length of the new array 452 if (ak->is_null_free_array_klass()) { 453 if ((len != 0) && (from >= org->length() || to > org->length())) { 454 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements"); 455 } 456 } 457 if (ak->is_flatArray_klass()) { 458 // The whole JVM_CopyOfSpecialArray is currently broken. Fix this in a separate bugfix. 459 int org_length = org->length(); 460 int copy_len = MIN2(to, org_length) - MIN2(from, org_length); 461 FlatArrayKlass* const fak = FlatArrayKlass::cast(org->klass()); 462 flatArrayOop dst = fak->allocate_instance(len, CHECK_NULL); 463 assert(!ak->is_null_free_array_klass() || copy_len == len, 464 "Failed to throw the IllegalArgumentException"); 465 if (copy_len != 0) { 466 int start = MIN2(from, org_length - 1); 467 FlatArrayPayload src_payload(flatArrayOop(oh()), start, fak); 468 FlatArrayPayload dst_payload(dst, 0, fak); 469 int end = to < oh()->length() ? to : oh()->length(); 470 for (int i = from; i < end; i++) { 471 // Copy a value 472 src_payload.copy_to(dst_payload); 473 474 // Advance to the next element 475 src_payload.next_element(); 476 dst_payload.next_element(); 477 } 478 } 479 array = dst; 480 } else { 481 const ArrayProperties props = ArrayProperties::Default().with_null_restricted(ak->is_null_free_array_klass()); 482 483 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL); 484 int end = to < oh()->length() ? to : oh()->length(); 485 for (int i = from; i < end; i++) { 486 if (i < ((objArrayOop)oh())->length()) { 487 oop val = ((objArrayOop)oh())->obj_at(i, CHECK_NULL); 488 ((objArrayOop)array)->obj_at_put(i - from, val); 489 } else { 490 assert(!ak->is_null_free_array_klass(), "Must be a nullable array"); 491 ((objArrayOop)array)->obj_at_put(i - from, nullptr); 492 } 493 } 494 } 495 return (jarray) JNIHandles::make_local(THREAD, array); 496 JVM_END 497 498 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal)) 499 oop mirror = JNIHandles::resolve_non_null(elmClass); 500 oop init = JNIHandles::resolve(initVal); 501 if (init == nullptr) { 502 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null"); 503 } 504 Handle init_h(THREAD, init); 505 Klass* klass = java_lang_Class::as_Klass(mirror); 506 if (klass != init_h()->klass()) { 507 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value"); 508 } 509 validate_array_arguments(klass, len, CHECK_NULL); 510 const ArrayProperties props = ArrayProperties::Default() 511 .with_null_restricted() 512 .with_non_atomic(); 513 514 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL); 515 for (int i = 0; i < len; i++) { 516 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ ); 517 } 518 return (jarray) JNIHandles::make_local(THREAD, array); 519 JVM_END 520 521 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal)) 522 oop mirror = JNIHandles::resolve_non_null(elmClass); 523 oop init = JNIHandles::resolve(initVal); 524 if (init == nullptr) { 525 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null"); 526 } 527 Handle init_h(THREAD, init); 528 Klass* klass = java_lang_Class::as_Klass(mirror); 529 if (klass != init_h()->klass()) { 530 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value"); 531 } 532 validate_array_arguments(klass, len, CHECK_NULL); 533 const ArrayProperties props = ArrayProperties::Default().with_null_restricted(); 534 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL); 535 for (int i = 0; i < len; i++) { 536 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ ); 537 } 538 return (jarray) JNIHandles::make_local(THREAD, array); 539 JVM_END 540 541 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len)) 542 oop mirror = JNIHandles::resolve_non_null(elmClass); 543 Klass* klass = java_lang_Class::as_Klass(mirror); 544 klass->initialize(CHECK_NULL); 545 validate_array_arguments(klass, len, CHECK_NULL); 546 objArrayOop array = oopFactory::new_objArray(klass, len, ArrayProperties::Default(), CHECK_NULL); 547 return (jarray) JNIHandles::make_local(THREAD, array); 548 JVM_END 549 550 JVM_ENTRY(jarray, JVM_NewReferenceArray(JNIEnv *env, jclass elmClass, jint len)) 551 oop mirror = JNIHandles::resolve_non_null(elmClass); 552 Klass* klass = java_lang_Class::as_Klass(mirror); 553 validate_array_arguments(klass, len, CHECK_NULL); 554 refArrayOop array = oopFactory::new_refArray(klass, len, ArrayProperties::Default(), CHECK_NULL); 555 return (jarray) JNIHandles::make_local(THREAD, array); 556 JVM_END 557 558 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jarray array)) 559 oop o = JNIHandles::resolve_non_null(array); 560 Klass* klass = o->klass(); 561 562 return klass->is_flatArray_klass(); 563 JVM_END 564 565 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jarray array)) 566 oop o = JNIHandles::resolve_non_null(array); 567 Klass* klass = o->klass(); 568 569 assert(klass->is_objArray_klass(), "Expects an object array"); 570 571 return klass->is_null_free_array_klass(); 572 JVM_END 573 574 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jarray array)) 575 // There are multiple cases where an array can/must support atomic access: 576 // - the array is a reference array 577 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or NULL_FREE_ATOMIC_FLAT 578 // - the array is flat and its component type is naturally atomic 579 oop o = JNIHandles::resolve_non_null(array); 580 Klass* klass = o->klass(); 581 582 assert(klass->is_objArray_klass(), "Expects an object array"); 583 584 if (klass->is_refArray_klass()) { 585 return true; 586 } 587 588 if (klass->is_flatArray_klass()) { 589 FlatArrayKlass* fak = FlatArrayKlass::cast(klass); 590 if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) { 591 return true; 592 } 593 bool is_null_free = !LayoutKindHelper::is_nullable_flat(fak->layout_kind()); 594 if (fak->element_klass()->is_naturally_atomic(is_null_free)) { 595 return true; 596 } 597 598 return false; 599 } 600 601 ShouldNotReachHere(); 602 JVM_END 603 604 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 605 606 extern volatile jint vm_created; 607 608 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 609 EventShutdown event; 610 if (event.should_commit()) { 611 event.set_reason("Shutdown requested from Java"); 612 event.commit(); 613 } 614 JVM_END 615 616 617 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 618 before_exit(thread, true); 619 vm_exit(code); 620 JVM_END 621 622 623 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 624 if (!DisableExplicitGC) { 625 EventSystemGC event; 626 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent); 627 Universe::heap()->collect(GCCause::_java_lang_system_gc); 628 event.commit(); 629 } 630 JVM_END 631 632 633 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 634 return Universe::heap()->millis_since_last_whole_heap_examined(); 635 JVM_END 636 637 638 static inline jlong convert_size_t_to_jlong(size_t val) { 639 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 640 NOT_LP64 (return (jlong)val;) 641 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 642 } 643 644 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 645 size_t n = Universe::heap()->capacity(); 646 return convert_size_t_to_jlong(n); 647 JVM_END 648 649 650 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 651 size_t n = Universe::heap()->unused(); 652 return convert_size_t_to_jlong(n); 653 JVM_END 654 655 656 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 657 size_t n = Universe::heap()->max_capacity(); 658 return convert_size_t_to_jlong(n); 659 JVM_END 660 661 662 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 663 return os::active_processor_count(); 664 JVM_END 665 666 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void)) 667 #ifdef LINUX 668 if (UseContainerSupport) { 669 return JNI_TRUE; 670 } 671 #endif 672 return JNI_FALSE; 673 JVM_END 674 675 JVM_LEAF(jboolean, JVM_IsContainerized(void)) 676 if (os::is_containerized()) { 677 return JNI_TRUE; 678 } 679 return JNI_FALSE; 680 JVM_END 681 682 // java.lang.Throwable ////////////////////////////////////////////////////// 683 684 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 685 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 686 java_lang_Throwable::fill_in_stack_trace(exception); 687 JVM_END 688 689 // java.lang.NullPointerException /////////////////////////////////////////// 690 691 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 692 if (!ShowCodeDetailsInExceptionMessages) return nullptr; 693 694 oop exc = JNIHandles::resolve_non_null(throwable); 695 696 Method* method; 697 int bci; 698 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 699 return nullptr; 700 } 701 if (method->is_native()) { 702 return nullptr; 703 } 704 705 stringStream ss; 706 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 707 if (ok) { 708 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 709 return (jstring) JNIHandles::make_local(THREAD, result); 710 } else { 711 return nullptr; 712 } 713 JVM_END 714 715 // java.lang.StackTraceElement ////////////////////////////////////////////// 716 717 718 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth)) 719 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace)); 720 refArrayOop st = refArrayOop(JNIHandles::resolve(elements)); 721 refArrayHandle stack_trace(THREAD, st); 722 // Fill in the allocated stack trace 723 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK); 724 JVM_END 725 726 727 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 728 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 729 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 730 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK); 731 JVM_END 732 733 734 // java.lang.StackWalker ////////////////////////////////////////////////////// 735 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj)) 736 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj)); 737 738 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr); 739 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr); 740 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info()); 741 if (!have_name) { 742 oop name = StringTable::intern(method->name(), CHECK); 743 java_lang_StackFrameInfo::set_name(stack_frame_info(), name); 744 } 745 if (!have_type) { 746 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK); 747 java_lang_StackFrameInfo::set_type(stack_frame_info(), type()); 748 } 749 JVM_END 750 751 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode, 752 jint skip_frames, jobject contScope, jobject cont, 753 jint buffer_size, jint start_index, jobjectArray frames)) 754 if (!thread->has_last_Java_frame()) { 755 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr); 756 } 757 758 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 759 Handle contScope_h(THREAD, JNIHandles::resolve(contScope)); 760 Handle cont_h(THREAD, JNIHandles::resolve(cont)); 761 // frames array is a ClassFrameInfo[] array when only getting caller reference, 762 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 763 // be null. 764 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames)); 765 refArrayHandle frames_array_h(THREAD, fa); 766 767 if (frames_array_h->length() < buffer_size) { 768 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr); 769 } 770 771 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h, 772 buffer_size, start_index, frames_array_h, CHECK_NULL); 773 return JNIHandles::make_local(THREAD, result); 774 JVM_END 775 776 777 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor, 778 jint last_batch_count, jint buffer_size, jint start_index, 779 jobjectArray frames)) 780 // frames array is a ClassFrameInfo[] array when only getting caller reference, 781 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 782 // be null. 783 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames)); 784 refArrayHandle frames_array_h(THREAD, fa); 785 786 if (frames_array_h->length() < buffer_size) { 787 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 788 } 789 790 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 791 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size, 792 start_index, frames_array_h, THREAD); 793 JVM_END 794 795 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont)) 796 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames)); 797 refArrayHandle frames_array_h(THREAD, fa); 798 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 799 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont)); 800 801 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD); 802 JVM_END 803 804 // java.lang.Object /////////////////////////////////////////////// 805 806 807 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 808 // as implemented in the classic virtual machine; return 0 if object is null 809 if (handle == nullptr) { 810 return 0; 811 } 812 oop obj = JNIHandles::resolve_non_null(handle); 813 if (Arguments::is_valhalla_enabled() && obj->klass()->is_inline_klass()) { 814 const intptr_t obj_identity_hash = obj->mark().hash(); 815 // Check if mark word contains hash code already. 816 // It is possible that the generated identity hash is 0, which is not 817 // distinct from the no_hash value. In such a case, the hash will be 818 // computed and set every time JVM_IHashCode is called. If that happens, 819 // the only consequence is losing out on the optimization. 820 if (obj_identity_hash != markWord::no_hash) { 821 return checked_cast<jint>(obj_identity_hash); 822 } 823 824 // Compute hash by calling ValueObjectMethods.valueObjectHashCode. 825 // The identity hash is invariantly immutable (see its JavaDoc comment). 826 JavaValue result(T_INT); 827 JavaCallArguments args; 828 Handle ho(THREAD, obj); 829 args.push_oop(ho); 830 methodHandle method(THREAD, Universe::value_object_hash_code_method()); 831 JavaCalls::call(&result, method, &args, THREAD); 832 Exceptions::wrap_exception_in_internal_error("Internal error in hashCode", CHECK_0); 833 834 const intptr_t identity_hash = result.get_jint(); 835 836 // We now have to set the hash via CAS. It's possible that this will race 837 // other threads. By our invariant of immutability, when there is a 838 // race, the identity hash code is going to be one of the following: 839 // a) 0, another thread updated other markWord bits; b) identity_hash set 840 // by another thread; or c) identity_hash set by the current thread. 841 // A nonzero identity hash code that is not the identity_hash computed 842 // earlier indicates a violation of the invariant. 843 markWord current_mark, old_mark, new_mark; 844 do { 845 current_mark = ho->mark(); 846 new_mark = current_mark.copy_set_hash(identity_hash); 847 old_mark = ho->cas_set_mark(new_mark, current_mark); 848 assert(old_mark.has_no_hash() || old_mark.hash() == new_mark.hash(), 849 "CAS identity hash invariant violated, expected=" INTPTR_FORMAT " actual=" INTPTR_FORMAT, 850 new_mark.hash(), 851 old_mark.hash()); 852 } while (old_mark != current_mark); 853 854 return checked_cast<jint>(new_mark.hash()); 855 } else { 856 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj)); 857 } 858 JVM_END 859 860 861 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 862 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 863 ObjectSynchronizer::wait(obj, ms, CHECK); 864 JVM_END 865 866 867 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 868 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 869 ObjectSynchronizer::notify(obj, CHECK); 870 JVM_END 871 872 873 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 874 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 875 ObjectSynchronizer::notifyall(obj, CHECK); 876 JVM_END 877 878 879 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 880 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 881 Klass* klass = obj->klass(); 882 JvmtiVMObjectAllocEventCollector oam; 883 884 #ifdef ASSERT 885 // Just checking that the cloneable flag is set correct 886 if (obj->is_array()) { 887 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 888 } else { 889 guarantee(obj->is_instance(), "should be instanceOop"); 890 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 891 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 892 } 893 #endif 894 895 // Check if class of obj supports the Cloneable interface. 896 // All arrays are considered to be cloneable (See JLS 20.1.5). 897 // All j.l.r.Reference classes are considered non-cloneable. 898 if (!klass->is_cloneable() || 899 (klass->is_instance_klass() && 900 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 901 ResourceMark rm(THREAD); 902 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 903 } 904 905 if (klass->is_inline_klass()) { 906 // Value instances have no identity, so return the current instance instead of allocating a new one 907 // Value classes cannot have finalizers, so the method can return immediately 908 return JNIHandles::make_local(THREAD, obj()); 909 } 910 911 // Make shallow object copy 912 const size_t size = obj->size(); 913 oop new_obj_oop = nullptr; 914 if (obj->is_array()) { 915 const int length = ((arrayOop)obj())->length(); 916 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 917 /* do_zero */ true, CHECK_NULL); 918 } else { 919 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 920 } 921 922 HeapAccess<>::clone(obj(), new_obj_oop, size); 923 924 Handle new_obj(THREAD, new_obj_oop); 925 // Caution: this involves a java upcall, so the clone should be 926 // "gc-robust" by this stage. 927 if (klass->has_finalizer()) { 928 assert(obj->is_instance(), "should be instanceOop"); 929 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 930 new_obj = Handle(THREAD, new_obj_oop); 931 } 932 933 return JNIHandles::make_local(THREAD, new_obj()); 934 JVM_END 935 936 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 937 938 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 939 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 940 JVM_END 941 942 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 943 return InstanceKlass::is_finalization_enabled(); 944 JVM_END 945 946 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 947 948 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 949 CONT_RegisterNativeMethods(env, cls); 950 JVM_END 951 952 // java.io.File /////////////////////////////////////////////////////////////// 953 954 JVM_LEAF(char*, JVM_NativePath(char* path)) 955 return os::native_path(path); 956 JVM_END 957 958 959 // Misc. class handling /////////////////////////////////////////////////////////// 960 961 962 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 963 // Getting the class of the caller frame. 964 // 965 // The call stack at this point looks something like this: 966 // 967 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ] 968 // [1] [ @CallerSensitive API.method ] 969 // [.] [ (skipped intermediate frames) ] 970 // [n] [ caller ] 971 vframeStream vfst(thread); 972 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 973 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 974 Method* m = vfst.method(); 975 assert(m != nullptr, "sanity"); 976 switch (n) { 977 case 0: 978 // This must only be called from Reflection.getCallerClass 979 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 980 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 981 } 982 // fall-through 983 case 1: 984 // Frame 0 and 1 must be caller sensitive. 985 if (!m->caller_sensitive()) { 986 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 987 } 988 break; 989 default: 990 if (!m->is_ignored_by_security_stack_walk()) { 991 // We have reached the desired frame; return the holder class. 992 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 993 } 994 break; 995 } 996 } 997 return nullptr; 998 JVM_END 999 1000 1001 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 1002 oop mirror = nullptr; 1003 BasicType t = name2type(utf); 1004 if (t != T_ILLEGAL && !is_reference_type(t)) { 1005 mirror = Universe::java_mirror(t); 1006 } 1007 if (mirror == nullptr) { 1008 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 1009 } else { 1010 return (jclass) JNIHandles::make_local(THREAD, mirror); 1011 } 1012 JVM_END 1013 1014 1015 // Returns a class loaded by the bootstrap class loader; or null 1016 // if not found. ClassNotFoundException is not thrown. 1017 // FindClassFromBootLoader is exported to the launcher for windows. 1018 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 1019 const char* name)) 1020 // Java libraries should ensure that name is never null or illegal. 1021 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 1022 // It's impossible to create this class; the name cannot fit 1023 // into the constant pool. 1024 return nullptr; 1025 } 1026 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name"); 1027 1028 TempNewSymbol h_name = SymbolTable::new_symbol(name); 1029 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 1030 if (k == nullptr) { 1031 return nullptr; 1032 } 1033 1034 if (log_is_enabled(Debug, class, resolve)) { 1035 trace_class_resolution(k); 1036 } 1037 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1038 JVM_END 1039 1040 // Find a class with this name in this loader. 1041 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name, 1042 jboolean init, jobject loader)) 1043 TempNewSymbol h_name = 1044 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 1045 CHECK_NULL); 1046 1047 oop loader_oop = JNIHandles::resolve(loader); 1048 Handle h_loader(THREAD, loader_oop); 1049 1050 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 1051 false, THREAD); 1052 1053 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1054 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 1055 } 1056 return result; 1057 JVM_END 1058 1059 // Currently only called from the old verifier. 1060 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 1061 jboolean init, jclass from)) 1062 TempNewSymbol h_name = 1063 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 1064 CHECK_NULL); 1065 oop from_class_oop = JNIHandles::resolve(from); 1066 assert(from_class_oop != nullptr, "must be"); 1067 Klass* from_class = java_lang_Class::as_Klass(from_class_oop); 1068 assert(from_class != nullptr, "must be"); 1069 oop class_loader = from_class->class_loader(); 1070 1071 Handle h_loader(THREAD, class_loader); 1072 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread); 1073 1074 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1075 // this function is generally only used for class loading during verification. 1076 ResourceMark rm; 1077 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name(); 1078 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name(); 1079 log_debug(class, resolve)("%s %s (verification)", from_name, to_name); 1080 } 1081 1082 #if INCLUDE_CDS 1083 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) { 1084 InstanceKlass* ik = InstanceKlass::cast(from_class); 1085 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name); 1086 } 1087 #endif 1088 1089 return result; 1090 JVM_END 1091 1092 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 1093 static jclass jvm_define_class_common(const char *name, 1094 jobject loader, const jbyte *buf, 1095 jsize len, jobject pd, const char *source, 1096 TRAPS) { 1097 if (source == nullptr) source = "__JVM_DefineClass__"; 1098 1099 JavaThread* jt = THREAD; 1100 1101 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 1102 ClassLoader::perf_define_appclass_selftime(), 1103 ClassLoader::perf_define_appclasses(), 1104 jt->get_thread_stat()->perf_recursion_counts_addr(), 1105 jt->get_thread_stat()->perf_timers_addr(), 1106 PerfClassTraceTime::DEFINE_CLASS); 1107 1108 if (UsePerfData) { 1109 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 1110 } 1111 1112 // Class resolution will get the class name from the .class stream if the name is null. 1113 TempNewSymbol class_name = name == nullptr ? nullptr : 1114 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1115 CHECK_NULL); 1116 1117 ResourceMark rm(THREAD); 1118 ClassFileStream st((u1*)buf, len, source); 1119 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 1120 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1121 ClassLoadInfo cl_info(protection_domain); 1122 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 1123 class_loader, 1124 cl_info, 1125 CHECK_NULL); 1126 1127 if (log_is_enabled(Debug, class, resolve)) { 1128 trace_class_resolution(k); 1129 } 1130 1131 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1132 } 1133 1134 enum { 1135 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 1136 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 1137 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 1138 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 1139 }; 1140 1141 /* 1142 * Define a class with the specified flags that indicates if it's a nestmate, 1143 * hidden, or strongly referenced from class loader. 1144 */ 1145 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 1146 const jbyte *buf, jsize len, jobject pd, 1147 jboolean init, int flags, jobject classData, TRAPS) { 1148 ResourceMark rm(THREAD); 1149 1150 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup)); 1151 // Lookup class must not be a primitive class (whose mirror has a null Klass*) 1152 if (lookup_k == nullptr) { 1153 // The error message is wrong. We come here only if lookup is a primitive class 1154 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1155 } 1156 1157 Handle class_loader (THREAD, lookup_k->class_loader()); 1158 1159 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 1160 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1161 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1162 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1163 1164 InstanceKlass* host_class = nullptr; 1165 if (is_nestmate) { 1166 host_class = lookup_k->nest_host(CHECK_NULL); 1167 } 1168 1169 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1170 name, 1171 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1172 is_nestmate ? host_class->external_name() : "", 1173 is_hidden ? "hidden" : "not hidden", 1174 is_strong ? "strong" : "weak", 1175 vm_annotations ? "with vm annotations" : "without vm annotation"); 1176 1177 if (!is_hidden) { 1178 // classData is only applicable for hidden classes 1179 if (classData != nullptr) { 1180 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1181 } 1182 if (is_nestmate) { 1183 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1184 } 1185 if (!is_strong) { 1186 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1187 } 1188 if (vm_annotations) { 1189 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1190 } 1191 if (flags != STRONG_LOADER_LINK) { 1192 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1193 err_msg("invalid flag 0x%x", flags)); 1194 } 1195 } 1196 1197 // Class resolution will get the class name from the .class stream if the name is null. 1198 TempNewSymbol class_name = name == nullptr ? nullptr : 1199 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1200 CHECK_NULL); 1201 1202 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1203 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1204 ClassFileStream st((u1*)buf, len, source); 1205 1206 InstanceKlass* ik = nullptr; 1207 if (!is_hidden) { 1208 ClassLoadInfo cl_info(protection_domain); 1209 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1210 class_loader, 1211 cl_info, 1212 CHECK_NULL); 1213 1214 if (log_is_enabled(Debug, class, resolve)) { 1215 trace_class_resolution(ik); 1216 } 1217 } else { // hidden 1218 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1219 ClassLoadInfo cl_info(protection_domain, 1220 host_class, 1221 classData_h, 1222 is_hidden, 1223 is_strong, 1224 vm_annotations); 1225 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1226 class_loader, 1227 cl_info, 1228 CHECK_NULL); 1229 1230 // The hidden class loader data has been artificially been kept alive to 1231 // this point. The mirror and any instances of this class have to keep 1232 // it alive afterwards. 1233 ik->class_loader_data()->dec_keep_alive_ref_count(); 1234 1235 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1236 ModuleEntry* module = ik->module(); 1237 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1238 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1239 module_name, 1240 ik->external_name(), 1241 host_class->external_name(), 1242 ik->is_hidden() ? "is hidden" : "is not hidden"); 1243 } 1244 } 1245 1246 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) { 1247 // non-hidden class or nestmate class must be in the same package as the Lookup class 1248 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages"); 1249 } 1250 1251 if (init) { 1252 ik->initialize(CHECK_NULL); 1253 } else { 1254 ik->link_class(CHECK_NULL); 1255 } 1256 1257 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1258 } 1259 1260 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1261 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1262 JVM_END 1263 1264 /* 1265 * Define a class with the specified lookup class. 1266 * lookup: Lookup class 1267 * name: the name of the class 1268 * buf: class bytes 1269 * len: length of class bytes 1270 * pd: protection domain 1271 * init: initialize the class 1272 * flags: properties of the class 1273 * classData: private static pre-initialized field 1274 */ 1275 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1276 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1277 1278 if (lookup == nullptr) { 1279 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1280 } 1281 1282 assert(buf != nullptr, "buf must not be null"); 1283 1284 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1285 JVM_END 1286 1287 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1288 1289 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1290 JVM_END 1291 1292 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1293 ResourceMark rm(THREAD); 1294 1295 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1296 char* str = java_lang_String::as_utf8_string(h_name()); 1297 1298 // Sanity check, don't expect null 1299 if (str == nullptr) return nullptr; 1300 1301 // Internalize the string, converting '.' to '/' in string. 1302 char* p = (char*)str; 1303 while (*p != '\0') { 1304 if (*p == '.') { 1305 *p = '/'; 1306 } 1307 p++; 1308 } 1309 1310 const int str_len = (int)(p - str); 1311 if (str_len > Symbol::max_length()) { 1312 // It's impossible to create this class; the name cannot fit 1313 // into the constant pool. 1314 return nullptr; 1315 } 1316 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1317 1318 // Security Note: 1319 // The Java level wrapper will perform the necessary security check allowing 1320 // us to pass the null as the initiating class loader. 1321 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1322 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader); 1323 #if INCLUDE_CDS 1324 if (k == nullptr) { 1325 // If the class is not already loaded, try to see if it's in the shared 1326 // archive for the current classloader (h_loader). 1327 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1328 } 1329 #endif 1330 return (k == nullptr) ? nullptr : 1331 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1332 JVM_END 1333 1334 // Module support ////////////////////////////////////////////////////////////////////////////// 1335 1336 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1337 jstring location, jobjectArray packages)) 1338 Handle h_module (THREAD, JNIHandles::resolve(module)); 1339 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1340 JVM_END 1341 1342 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1343 Handle h_module (THREAD, JNIHandles::resolve(module)); 1344 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1345 JVM_END 1346 1347 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1348 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1349 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1350 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1351 JVM_END 1352 1353 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1354 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1355 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1356 JVM_END 1357 1358 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1359 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1360 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1361 JVM_END 1362 1363 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1364 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1365 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1366 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1367 JVM_END 1368 1369 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1370 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1371 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1372 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1373 JVM_END 1374 1375 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1376 1377 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1378 assert (cls != nullptr, "illegal class"); 1379 JvmtiVMObjectAllocEventCollector oam; 1380 ResourceMark rm(THREAD); 1381 HandleMark hm(THREAD); 1382 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1383 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1384 return (jstring) JNIHandles::make_local(THREAD, result); 1385 JVM_END 1386 1387 1388 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1389 JvmtiVMObjectAllocEventCollector oam; 1390 oop mirror = JNIHandles::resolve_non_null(cls); 1391 1392 // Special handling for primitive objects 1393 if (java_lang_Class::is_primitive(mirror)) { 1394 // Primitive objects does not have any interfaces 1395 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1396 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1397 } 1398 1399 Klass* klass = java_lang_Class::as_Klass(mirror); 1400 // Figure size of result array 1401 int size; 1402 if (klass->is_instance_klass()) { 1403 InstanceKlass* ik = InstanceKlass::cast(klass); 1404 size = ik->local_interfaces()->length(); 1405 } else { 1406 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1407 size = 2; 1408 } 1409 1410 // Allocate result array 1411 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1412 objArrayHandle result (THREAD, r); 1413 // Fill in result 1414 if (klass->is_instance_klass()) { 1415 // Regular instance klass, fill in all local interfaces 1416 for (int index = 0; index < size; index++) { 1417 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1418 result->obj_at_put(index, k->java_mirror()); 1419 } 1420 } else { 1421 // All arrays implement java.lang.Cloneable and java.io.Serializable 1422 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1423 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1424 } 1425 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1426 JVM_END 1427 1428 1429 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1430 oop mirror = JNIHandles::resolve_non_null(cls); 1431 if (java_lang_Class::is_primitive(mirror)) { 1432 return JNI_FALSE; 1433 } 1434 Klass* k = java_lang_Class::as_Klass(mirror); 1435 return k->is_hidden(); 1436 JVM_END 1437 1438 1439 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1440 ResourceMark rm(THREAD); 1441 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1442 JvmtiVMObjectAllocEventCollector oam; 1443 1444 // Iterate through Java frames 1445 vframeStream vfst(thread); 1446 for(; !vfst.at_end(); vfst.next()) { 1447 int loc = -1; 1448 // get method of frame 1449 Method* method = vfst.method(); 1450 1451 Symbol *name = method->name(); 1452 1453 InstanceKlass* holder = method->method_holder(); 1454 if (name == vmSymbols::runWith_method_name()) { 1455 if (holder == vmClasses::Thread_klass() 1456 || holder == vmClasses::ScopedValue_Carrier_klass()) { 1457 loc = 1; 1458 } 1459 } 1460 1461 if (loc != -1) { 1462 javaVFrame *frame = vfst.asJavaVFrame(); 1463 StackValueCollection* locals = frame->locals(); 1464 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot 1465 Handle result = head_sv->get_obj(); 1466 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1467 if (result() != nullptr) { 1468 return JNIHandles::make_local(THREAD, result()); 1469 } 1470 } 1471 } 1472 1473 return nullptr; 1474 JVM_END 1475 1476 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1477 JvmtiVMObjectAllocEventCollector oam; 1478 // ofClass is a reference to a java_lang_Class object. The mirror object 1479 // of an InstanceKlass 1480 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1481 if (java_lang_Class::is_primitive(ofMirror) || 1482 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1483 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1484 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1485 } 1486 1487 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1488 InnerClassesIterator iter(k); 1489 1490 if (iter.length() == 0) { 1491 // Neither an inner nor outer class 1492 oop result = oopFactory::new_refArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1493 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1494 } 1495 1496 // find inner class info 1497 constantPoolHandle cp(thread, k->constants()); 1498 int length = iter.length(); 1499 1500 // Allocate temp. result array 1501 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length / 4, CHECK_NULL); 1502 refArrayHandle result(THREAD, r); 1503 int members = 0; 1504 1505 for (; !iter.done(); iter.next()) { 1506 int ioff = iter.inner_class_info_index(); 1507 int ooff = iter.outer_class_info_index(); 1508 1509 if (ioff != 0 && ooff != 0) { 1510 // Check to see if the name matches the class we're looking for 1511 // before attempting to find the class. 1512 if (cp->klass_name_at_matches(k, ooff)) { 1513 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1514 if (outer_klass == k) { 1515 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1516 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1517 1518 // Throws an exception if outer klass has not declared k as 1519 // an inner klass 1520 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1521 1522 result->obj_at_put(members, inner_klass->java_mirror()); 1523 members++; 1524 } 1525 } 1526 } 1527 } 1528 1529 if (members != length) { 1530 // Return array of right length 1531 refArrayOop res = oopFactory::new_refArray(vmClasses::Class_klass(), members, CHECK_NULL); 1532 for(int i = 0; i < members; i++) { 1533 res->obj_at_put(i, result->obj_at(i)); 1534 } 1535 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1536 } 1537 1538 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1539 JVM_END 1540 1541 1542 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1543 { 1544 // ofClass is a reference to a java_lang_Class object. 1545 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1546 if (java_lang_Class::is_primitive(ofMirror)) { 1547 return nullptr; 1548 } 1549 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1550 if (!klass->is_instance_klass()) { 1551 return nullptr; 1552 } 1553 1554 bool inner_is_member = false; 1555 Klass* outer_klass 1556 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1557 if (outer_klass == nullptr) return nullptr; // already a top-level class 1558 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1559 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1560 } 1561 JVM_END 1562 1563 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1564 { 1565 oop mirror = JNIHandles::resolve_non_null(cls); 1566 if (java_lang_Class::is_primitive(mirror)) { 1567 return nullptr; 1568 } 1569 Klass* klass = java_lang_Class::as_Klass(mirror); 1570 if (!klass->is_instance_klass()) { 1571 return nullptr; 1572 } 1573 InstanceKlass* k = InstanceKlass::cast(klass); 1574 int ooff = 0, noff = 0; 1575 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1576 if (noff != 0) { 1577 constantPoolHandle i_cp(thread, k->constants()); 1578 Symbol* name = i_cp->symbol_at(noff); 1579 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1580 return (jstring) JNIHandles::make_local(THREAD, str()); 1581 } 1582 } 1583 return nullptr; 1584 } 1585 JVM_END 1586 1587 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1588 assert (cls != nullptr, "illegal class"); 1589 JvmtiVMObjectAllocEventCollector oam; 1590 ResourceMark rm(THREAD); 1591 oop mirror = JNIHandles::resolve_non_null(cls); 1592 // Return null for arrays and primitives 1593 if (!java_lang_Class::is_primitive(mirror)) { 1594 Klass* k = java_lang_Class::as_Klass(mirror); 1595 if (k->is_instance_klass()) { 1596 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1597 if (sym == nullptr) return nullptr; 1598 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1599 return (jstring) JNIHandles::make_local(THREAD, str()); 1600 } 1601 } 1602 return nullptr; 1603 JVM_END 1604 1605 1606 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1607 assert (cls != nullptr, "illegal class"); 1608 oop mirror = JNIHandles::resolve_non_null(cls); 1609 // Return null for arrays and primitives 1610 if (!java_lang_Class::is_primitive(mirror)) { 1611 Klass* k = java_lang_Class::as_Klass(mirror); 1612 if (k->is_instance_klass()) { 1613 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1614 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1615 } 1616 } 1617 return nullptr; 1618 JVM_END 1619 1620 1621 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1622 // some of this code was adapted from from jni_FromReflectedField 1623 1624 oop reflected = JNIHandles::resolve_non_null(field); 1625 oop mirror = java_lang_reflect_Field::clazz(reflected); 1626 int slot = java_lang_reflect_Field::slot(reflected); 1627 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1628 1629 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 1630 int offset = ik->field_offset(slot); 1631 1632 if (modifiers & JVM_ACC_STATIC) { 1633 // for static fields we only look in the current class 1634 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1635 assert(false, "cannot find static field"); 1636 return false; 1637 } 1638 } else { 1639 // for instance fields we start with the current class and work 1640 // our way up through the superclass chain 1641 if (!ik->find_field_from_offset(offset, false, &fd)) { 1642 assert(false, "cannot find instance field"); 1643 return false; 1644 } 1645 } 1646 return true; 1647 } 1648 1649 static Method* jvm_get_method_common(jobject method) { 1650 // some of this code was adapted from from jni_FromReflectedMethod 1651 1652 oop reflected = JNIHandles::resolve_non_null(method); 1653 oop mirror = nullptr; 1654 int slot = 0; 1655 1656 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1657 mirror = java_lang_reflect_Constructor::clazz(reflected); 1658 slot = java_lang_reflect_Constructor::slot(reflected); 1659 } else { 1660 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1661 "wrong type"); 1662 mirror = java_lang_reflect_Method::clazz(reflected); 1663 slot = java_lang_reflect_Method::slot(reflected); 1664 } 1665 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 1666 1667 Method* m = ik->method_with_idnum(slot); 1668 assert(m != nullptr, "cannot find method"); 1669 return m; // caller has to deal with null in product mode 1670 } 1671 1672 /* Type use annotations support (JDK 1.8) */ 1673 1674 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1675 assert (cls != nullptr, "illegal class"); 1676 ResourceMark rm(THREAD); 1677 // Return null for arrays and primitives 1678 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1679 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1680 if (k->is_instance_klass()) { 1681 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1682 if (type_annotations != nullptr) { 1683 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1684 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1685 } 1686 } 1687 } 1688 return nullptr; 1689 JVM_END 1690 1691 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1692 assert (method != nullptr, "illegal method"); 1693 // method is a handle to a java.lang.reflect.Method object 1694 Method* m = jvm_get_method_common(method); 1695 if (m == nullptr) { 1696 return nullptr; 1697 } 1698 1699 AnnotationArray* type_annotations = m->type_annotations(); 1700 if (type_annotations != nullptr) { 1701 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1702 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1703 } 1704 1705 return nullptr; 1706 JVM_END 1707 1708 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1709 assert (field != nullptr, "illegal field"); 1710 fieldDescriptor fd; 1711 bool gotFd = jvm_get_field_common(field, fd); 1712 if (!gotFd) { 1713 return nullptr; 1714 } 1715 1716 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1717 JVM_END 1718 1719 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1720 if (!cp->is_within_bounds(index)) { 1721 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1722 } 1723 } 1724 1725 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1726 { 1727 // method is a handle to a java.lang.reflect.Method object 1728 Method* method_ptr = jvm_get_method_common(method); 1729 methodHandle mh (THREAD, method_ptr); 1730 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1731 const int num_params = mh->method_parameters_length(); 1732 1733 if (num_params < 0) { 1734 // A -1 return value from method_parameters_length means there is no 1735 // parameter data. Return null to indicate this to the reflection 1736 // API. 1737 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1738 return (jobjectArray)nullptr; 1739 } else { 1740 // Otherwise, we return something up to reflection, even if it is 1741 // a zero-length array. Why? Because in some cases this can 1742 // trigger a MalformedParametersException. 1743 1744 // make sure all the symbols are properly formatted 1745 for (int i = 0; i < num_params; i++) { 1746 MethodParametersElement* params = mh->method_parameters_start(); 1747 int index = params[i].name_cp_index; 1748 constantPoolHandle cp(THREAD, mh->constants()); 1749 bounds_check(cp, index, CHECK_NULL); 1750 1751 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1752 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1753 "Wrong type at constant pool index"); 1754 } 1755 1756 } 1757 1758 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1759 objArrayHandle result (THREAD, result_oop); 1760 1761 for (int i = 0; i < num_params; i++) { 1762 MethodParametersElement* params = mh->method_parameters_start(); 1763 // For a 0 index, give a null symbol 1764 Symbol* sym = 0 != params[i].name_cp_index ? 1765 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1766 int flags = params[i].flags; 1767 oop param = Reflection::new_parameter(reflected_method, i, sym, 1768 flags, CHECK_NULL); 1769 result->obj_at_put(i, param); 1770 } 1771 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1772 } 1773 } 1774 JVM_END 1775 1776 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1777 1778 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1779 { 1780 JvmtiVMObjectAllocEventCollector oam; 1781 1782 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1783 // Exclude primitive types and array types 1784 if (java_lang_Class::is_primitive(ofMirror) || 1785 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1786 // Return empty array 1787 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1788 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1789 } 1790 1791 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1792 constantPoolHandle cp(THREAD, k->constants()); 1793 1794 // Ensure class is linked 1795 k->link_class(CHECK_NULL); 1796 1797 // Allocate result 1798 int num_fields; 1799 1800 if (publicOnly) { 1801 num_fields = 0; 1802 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1803 if (fs.access_flags().is_public()) ++num_fields; 1804 } 1805 } else { 1806 num_fields = k->java_fields_count(); 1807 } 1808 1809 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1810 objArrayHandle result (THREAD, r); 1811 1812 int out_idx = 0; 1813 fieldDescriptor fd; 1814 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1815 if (!publicOnly || fs.access_flags().is_public()) { 1816 fd.reinitialize(k, fs.to_FieldInfo()); 1817 oop field = Reflection::new_field(&fd, CHECK_NULL); 1818 result->obj_at_put(out_idx, field); 1819 ++out_idx; 1820 } 1821 } 1822 assert(out_idx == num_fields, "just checking"); 1823 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1824 } 1825 JVM_END 1826 1827 // A class is a record if and only if it is final and a direct subclass of 1828 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1829 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1830 { 1831 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1832 if (k != nullptr && k->is_instance_klass()) { 1833 InstanceKlass* ik = InstanceKlass::cast(k); 1834 return ik->is_record(); 1835 } else { 1836 return false; 1837 } 1838 } 1839 JVM_END 1840 1841 // Returns an array containing the components of the Record attribute, 1842 // or null if the attribute is not present. 1843 // 1844 // Note that this function returns the components of the Record attribute 1845 // even if the class is not a record. 1846 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1847 { 1848 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass)); 1849 1850 Array<RecordComponent*>* components = ik->record_components(); 1851 if (components != nullptr) { 1852 JvmtiVMObjectAllocEventCollector oam; 1853 constantPoolHandle cp(THREAD, ik->constants()); 1854 int length = components->length(); 1855 assert(length >= 0, "unexpected record_components length"); 1856 objArrayOop record_components = 1857 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1858 objArrayHandle components_h (THREAD, record_components); 1859 1860 for (int x = 0; x < length; x++) { 1861 RecordComponent* component = components->at(x); 1862 assert(component != nullptr, "unexpected null record component"); 1863 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1864 components_h->obj_at_put(x, component_oop); 1865 } 1866 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1867 } 1868 1869 return nullptr; 1870 } 1871 JVM_END 1872 1873 static jobjectArray get_class_declared_methods_helper( 1874 JNIEnv *env, 1875 jclass ofClass, jboolean publicOnly, 1876 bool want_constructor, 1877 Klass* klass, TRAPS) { 1878 1879 JvmtiVMObjectAllocEventCollector oam; 1880 1881 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1882 // Exclude primitive types and array types 1883 if (java_lang_Class::is_primitive(ofMirror) 1884 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1885 // Return empty array 1886 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1887 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1888 } 1889 1890 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1891 1892 // Ensure class is linked 1893 k->link_class(CHECK_NULL); 1894 1895 Array<Method*>* methods = k->methods(); 1896 int methods_length = methods->length(); 1897 1898 // Save original method_idnum in case of redefinition, which can change 1899 // the idnum of obsolete methods. The new method will have the same idnum 1900 // but if we refresh the methods array, the counts will be wrong. 1901 ResourceMark rm(THREAD); 1902 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1903 int num_methods = 0; 1904 1905 // Select methods matching the criteria. 1906 for (int i = 0; i < methods_length; i++) { 1907 Method* method = methods->at(i); 1908 if (want_constructor && !method->is_object_constructor()) { 1909 continue; 1910 } 1911 if (!want_constructor && 1912 (method->is_object_constructor() || method->is_class_initializer() || 1913 method->is_overpass())) { 1914 continue; 1915 } 1916 if (publicOnly && !method->is_public()) { 1917 continue; 1918 } 1919 idnums->push(method->method_idnum()); 1920 ++num_methods; 1921 } 1922 1923 // Allocate result 1924 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1925 objArrayHandle result (THREAD, r); 1926 1927 // Now just put the methods that we selected above, but go by their idnum 1928 // in case of redefinition. The methods can be redefined at any safepoint, 1929 // so above when allocating the oop array and below when creating reflect 1930 // objects. 1931 for (int i = 0; i < num_methods; i++) { 1932 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1933 if (method.is_null()) { 1934 // Method may have been deleted and seems this API can handle null 1935 // Otherwise should probably put a method that throws NSME 1936 result->obj_at_put(i, nullptr); 1937 } else { 1938 oop m; 1939 if (want_constructor) { 1940 assert(method->is_object_constructor(), "must be"); 1941 m = Reflection::new_constructor(method, CHECK_NULL); 1942 } else { 1943 m = Reflection::new_method(method, false, CHECK_NULL); 1944 } 1945 result->obj_at_put(i, m); 1946 } 1947 } 1948 1949 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1950 } 1951 1952 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1953 { 1954 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1955 /*want_constructor*/ false, 1956 vmClasses::reflect_Method_klass(), THREAD); 1957 } 1958 JVM_END 1959 1960 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1961 { 1962 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1963 /*want_constructor*/ true, 1964 vmClasses::reflect_Constructor_klass(), THREAD); 1965 } 1966 JVM_END 1967 1968 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1969 { 1970 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1971 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member)); 1972 return c->has_nestmate_access_to(m, THREAD); 1973 } 1974 JVM_END 1975 1976 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1977 { 1978 // current is not a primitive or array class 1979 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1980 InstanceKlass* host = c->nest_host(THREAD); 1981 return (jclass) (host == nullptr ? nullptr : 1982 JNIHandles::make_local(THREAD, host->java_mirror())); 1983 } 1984 JVM_END 1985 1986 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1987 { 1988 // current is not a primitive or array class 1989 ResourceMark rm(THREAD); 1990 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1991 InstanceKlass* host = c->nest_host(THREAD); 1992 1993 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 1994 c->external_name(), host->external_name()); 1995 { 1996 JvmtiVMObjectAllocEventCollector oam; 1997 Array<u2>* members = host->nest_members(); 1998 int length = members == nullptr ? 0 : members->length(); 1999 2000 log_trace(class, nestmates)(" - host has %d listed nest members", length); 2001 2002 // nest host is first in the array so make it one bigger 2003 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length + 1, CHECK_NULL); 2004 refArrayHandle result(THREAD, r); 2005 result->obj_at_put(0, host->java_mirror()); 2006 if (length != 0) { 2007 int count = 0; 2008 for (int i = 0; i < length; i++) { 2009 int cp_index = members->at(i); 2010 Klass* k = host->constants()->klass_at(cp_index, THREAD); 2011 if (HAS_PENDING_EXCEPTION) { 2012 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2013 return nullptr; // propagate VMEs 2014 } 2015 if (log_is_enabled(Trace, class, nestmates)) { 2016 stringStream ss; 2017 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2018 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2019 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2020 log_trace(class, nestmates)("%s", ss.as_string()); 2021 } 2022 CLEAR_PENDING_EXCEPTION; 2023 continue; 2024 } 2025 if (k->is_instance_klass()) { 2026 InstanceKlass* ik = InstanceKlass::cast(k); 2027 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2028 if (nest_host_k == host) { 2029 result->obj_at_put(count+1, k->java_mirror()); 2030 count++; 2031 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2032 } else { 2033 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2034 ik->external_name(), nest_host_k->external_name()); 2035 } 2036 } else { 2037 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2038 k->external_name()); 2039 } 2040 } 2041 if (count < length) { 2042 // we had invalid entries so we need to compact the array 2043 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2044 length + 1, count + 1); 2045 2046 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2047 count + 1, CHECK_NULL); 2048 objArrayHandle result2(THREAD, r2); 2049 for (int i = 0; i < count + 1; i++) { 2050 result2->obj_at_put(i, result->obj_at(i)); 2051 } 2052 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2053 } 2054 } 2055 else { 2056 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate"); 2057 } 2058 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2059 } 2060 } 2061 JVM_END 2062 2063 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2064 { 2065 oop mirror = JNIHandles::resolve_non_null(current); 2066 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2067 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 2068 2069 ResourceMark rm(THREAD); 2070 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2071 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2072 if (ik->is_sealed()) { 2073 JvmtiVMObjectAllocEventCollector oam; 2074 Array<u2>* subclasses = ik->permitted_subclasses(); 2075 int length = subclasses->length(); 2076 2077 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2078 2079 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length, CHECK_NULL); 2080 refArrayHandle result(THREAD, r); 2081 int count = 0; 2082 for (int i = 0; i < length; i++) { 2083 int cp_index = subclasses->at(i); 2084 Klass* k = ik->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, sealed)) { 2090 stringStream ss; 2091 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2092 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2093 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2094 log_trace(class, sealed)("%s", ss.as_string()); 2095 } 2096 2097 CLEAR_PENDING_EXCEPTION; 2098 continue; 2099 } 2100 if (k->is_instance_klass()) { 2101 result->obj_at_put(count++, k->java_mirror()); 2102 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2103 } 2104 } 2105 if (count < length) { 2106 // we had invalid entries so we need to compact the array 2107 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2108 count, CHECK_NULL); 2109 objArrayHandle result2(THREAD, r2); 2110 for (int i = 0; i < count; i++) { 2111 result2->obj_at_put(i, result->obj_at(i)); 2112 } 2113 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2114 } 2115 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2116 } else { 2117 return nullptr; 2118 } 2119 } 2120 JVM_END 2121 2122 // Constant pool access ////////////////////////////////////////////////////////// 2123 2124 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2125 { 2126 JvmtiVMObjectAllocEventCollector oam; 2127 oop mirror = JNIHandles::resolve_non_null(cls); 2128 // Return null for primitives and arrays 2129 if (!java_lang_Class::is_primitive(mirror)) { 2130 Klass* k = java_lang_Class::as_Klass(mirror); 2131 if (k->is_instance_klass()) { 2132 InstanceKlass* k_h = InstanceKlass::cast(k); 2133 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2134 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2135 return JNIHandles::make_local(THREAD, jcp()); 2136 } 2137 } 2138 return nullptr; 2139 } 2140 JVM_END 2141 2142 2143 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj)) 2144 { 2145 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2146 return cp->length(); 2147 } 2148 JVM_END 2149 2150 2151 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index)) 2152 { 2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2154 bounds_check(cp, index, CHECK_NULL); 2155 constantTag tag = cp->tag_at(index); 2156 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2157 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2158 } 2159 Klass* k = cp->klass_at(index, CHECK_NULL); 2160 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2161 } 2162 JVM_END 2163 2164 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2165 { 2166 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2167 bounds_check(cp, index, CHECK_NULL); 2168 constantTag tag = cp->tag_at(index); 2169 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2170 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2171 } 2172 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2173 if (k == nullptr) return nullptr; 2174 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2175 } 2176 JVM_END 2177 2178 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2179 constantTag tag = cp->tag_at(index); 2180 if (!tag.is_method() && !tag.is_interface_method()) { 2181 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2182 } 2183 int klass_ref = cp->uncached_klass_ref_index_at(index); 2184 Klass* k_o; 2185 if (force_resolution) { 2186 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2187 } else { 2188 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2189 if (k_o == nullptr) return nullptr; 2190 } 2191 InstanceKlass* k = InstanceKlass::cast(k_o); 2192 Symbol* name = cp->uncached_name_ref_at(index); 2193 Symbol* sig = cp->uncached_signature_ref_at(index); 2194 methodHandle m (THREAD, k->find_method(name, sig)); 2195 if (m.is_null()) { 2196 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2197 } 2198 oop method; 2199 if (m->is_object_constructor()) { 2200 method = Reflection::new_constructor(m, CHECK_NULL); 2201 } else { 2202 method = Reflection::new_method(m, true, CHECK_NULL); 2203 } 2204 return JNIHandles::make_local(THREAD, method); 2205 } 2206 2207 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index)) 2208 { 2209 JvmtiVMObjectAllocEventCollector oam; 2210 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2211 bounds_check(cp, index, CHECK_NULL); 2212 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2213 return res; 2214 } 2215 JVM_END 2216 2217 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2218 { 2219 JvmtiVMObjectAllocEventCollector oam; 2220 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2221 bounds_check(cp, index, CHECK_NULL); 2222 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2223 return res; 2224 } 2225 JVM_END 2226 2227 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2228 constantTag tag = cp->tag_at(index); 2229 if (!tag.is_field()) { 2230 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2231 } 2232 int klass_ref = cp->uncached_klass_ref_index_at(index); 2233 Klass* k_o; 2234 if (force_resolution) { 2235 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2236 } else { 2237 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2238 if (k_o == nullptr) return nullptr; 2239 } 2240 InstanceKlass* k = InstanceKlass::cast(k_o); 2241 Symbol* name = cp->uncached_name_ref_at(index); 2242 Symbol* sig = cp->uncached_signature_ref_at(index); 2243 fieldDescriptor fd; 2244 Klass* target_klass = k->find_field(name, sig, &fd); 2245 if (target_klass == nullptr) { 2246 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2247 } 2248 oop field = Reflection::new_field(&fd, CHECK_NULL); 2249 return JNIHandles::make_local(THREAD, field); 2250 } 2251 2252 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index)) 2253 { 2254 JvmtiVMObjectAllocEventCollector oam; 2255 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2256 bounds_check(cp, index, CHECK_NULL); 2257 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2258 return res; 2259 } 2260 JVM_END 2261 2262 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2263 { 2264 JvmtiVMObjectAllocEventCollector oam; 2265 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2266 bounds_check(cp, index, CHECK_NULL); 2267 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2268 return res; 2269 } 2270 JVM_END 2271 2272 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index)) 2273 { 2274 JvmtiVMObjectAllocEventCollector oam; 2275 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2276 bounds_check(cp, index, CHECK_NULL); 2277 constantTag tag = cp->tag_at(index); 2278 if (!tag.is_field_or_method()) { 2279 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2280 } 2281 int klass_ref = cp->uncached_klass_ref_index_at(index); 2282 Symbol* klass_name = cp->klass_name_at(klass_ref); 2283 Symbol* member_name = cp->uncached_name_ref_at(index); 2284 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2285 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2286 objArrayHandle dest(THREAD, dest_o); 2287 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2288 dest->obj_at_put(0, str()); 2289 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2290 dest->obj_at_put(1, str()); 2291 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2292 dest->obj_at_put(2, str()); 2293 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2294 } 2295 JVM_END 2296 2297 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index)) 2298 { 2299 JvmtiVMObjectAllocEventCollector oam; 2300 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2301 bounds_check(cp, index, CHECK_0); 2302 constantTag tag = cp->tag_at(index); 2303 if (!tag.is_field_or_method()) { 2304 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2305 } 2306 return (jint) cp->uncached_klass_ref_index_at(index); 2307 } 2308 JVM_END 2309 2310 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index)) 2311 { 2312 JvmtiVMObjectAllocEventCollector oam; 2313 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2314 bounds_check(cp, index, CHECK_0); 2315 constantTag tag = cp->tag_at(index); 2316 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2317 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2318 } 2319 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2320 } 2321 JVM_END 2322 2323 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index)) 2324 { 2325 JvmtiVMObjectAllocEventCollector oam; 2326 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2327 bounds_check(cp, index, CHECK_NULL); 2328 constantTag tag = cp->tag_at(index); 2329 if (!tag.is_name_and_type()) { 2330 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2331 } 2332 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2333 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2334 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2335 objArrayHandle dest(THREAD, dest_o); 2336 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2337 dest->obj_at_put(0, str()); 2338 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2339 dest->obj_at_put(1, str()); 2340 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2341 } 2342 JVM_END 2343 2344 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index)) 2345 { 2346 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2347 bounds_check(cp, index, CHECK_0); 2348 constantTag tag = cp->tag_at(index); 2349 if (!tag.is_int()) { 2350 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2351 } 2352 return cp->int_at(index); 2353 } 2354 JVM_END 2355 2356 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index)) 2357 { 2358 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2359 bounds_check(cp, index, CHECK_(0L)); 2360 constantTag tag = cp->tag_at(index); 2361 if (!tag.is_long()) { 2362 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2363 } 2364 return cp->long_at(index); 2365 } 2366 JVM_END 2367 2368 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index)) 2369 { 2370 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2371 bounds_check(cp, index, CHECK_(0.0f)); 2372 constantTag tag = cp->tag_at(index); 2373 if (!tag.is_float()) { 2374 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2375 } 2376 return cp->float_at(index); 2377 } 2378 JVM_END 2379 2380 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index)) 2381 { 2382 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2383 bounds_check(cp, index, CHECK_(0.0)); 2384 constantTag tag = cp->tag_at(index); 2385 if (!tag.is_double()) { 2386 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2387 } 2388 return cp->double_at(index); 2389 } 2390 JVM_END 2391 2392 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index)) 2393 { 2394 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2395 bounds_check(cp, index, CHECK_NULL); 2396 constantTag tag = cp->tag_at(index); 2397 if (!tag.is_string()) { 2398 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2399 } 2400 oop str = cp->string_at(index, CHECK_NULL); 2401 return (jstring) JNIHandles::make_local(THREAD, str); 2402 } 2403 JVM_END 2404 2405 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index)) 2406 { 2407 JvmtiVMObjectAllocEventCollector oam; 2408 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2409 bounds_check(cp, index, CHECK_NULL); 2410 constantTag tag = cp->tag_at(index); 2411 if (!tag.is_symbol()) { 2412 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2413 } 2414 Symbol* sym = cp->symbol_at(index); 2415 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2416 return (jstring) JNIHandles::make_local(THREAD, str()); 2417 } 2418 JVM_END 2419 2420 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, 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 jbyte result = tag.value(); 2426 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2427 // they are changed to the corresponding tags from the JVM spec, so that java code in 2428 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2429 if (tag.is_klass_or_reference()) { 2430 result = JVM_CONSTANT_Class; 2431 } else if (tag.is_string_index()) { 2432 result = JVM_CONSTANT_String; 2433 } else if (tag.is_method_type_in_error()) { 2434 result = JVM_CONSTANT_MethodType; 2435 } else if (tag.is_method_handle_in_error()) { 2436 result = JVM_CONSTANT_MethodHandle; 2437 } else if (tag.is_dynamic_constant_in_error()) { 2438 result = JVM_CONSTANT_Dynamic; 2439 } 2440 return result; 2441 } 2442 JVM_END 2443 2444 // Assertion support. ////////////////////////////////////////////////////////// 2445 2446 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2447 assert(cls != nullptr, "bad class"); 2448 2449 oop r = JNIHandles::resolve(cls); 2450 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2451 if (java_lang_Class::is_primitive(r)) return false; 2452 2453 Klass* k = java_lang_Class::as_Klass(r); 2454 assert(k->is_instance_klass(), "must be an instance klass"); 2455 if (!k->is_instance_klass()) return false; 2456 2457 ResourceMark rm(THREAD); 2458 const char* name = k->name()->as_C_string(); 2459 bool system_class = k->class_loader() == nullptr; 2460 return JavaAssertions::enabled(name, system_class); 2461 2462 JVM_END 2463 2464 2465 // Return a new AssertionStatusDirectives object with the fields filled in with 2466 // command-line assertion arguments (i.e., -ea, -da). 2467 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2468 JvmtiVMObjectAllocEventCollector oam; 2469 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2470 return JNIHandles::make_local(THREAD, asd); 2471 JVM_END 2472 2473 // Verification //////////////////////////////////////////////////////////////////////////////// 2474 2475 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2476 2477 // RedefineClasses support: bug 6214132 caused verification to fail. 2478 // All functions from this section, unless noted otherwise, should call the functions 2479 // get_klass_considering_redefinition(), or 2480 // get_instance_klass_considering_redefinition() 2481 // These functions return JvmtiThreadState::_scratch_class if the verifier 2482 // was invoked in the middle of the redefinition of cls. 2483 // See jvmtiThreadState.hpp for details. 2484 2485 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) { 2486 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2487 if (k->is_instance_klass()) { 2488 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread); 2489 } else { 2490 return k; 2491 } 2492 } 2493 2494 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) { 2495 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls)); 2496 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread); 2497 } 2498 2499 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 2500 oop mirror = JNIHandles::resolve_non_null(cls); 2501 if (java_lang_Class::is_primitive(mirror)) { 2502 return JNI_FALSE; 2503 } 2504 Klass* k = java_lang_Class::as_Klass(mirror); 2505 // This isn't necessary since answer is the same because redefinition 2506 // has already checked this matches for the scratch class. 2507 // k = get_klass_considering_redefinition(cls, thread) 2508 jboolean result = k->is_interface(); 2509 assert(!result || k->is_instance_klass(), 2510 "all interfaces are instance types"); 2511 return result; 2512 JVM_END 2513 2514 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2515 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name. 2516 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2517 return k->name()->as_utf8(); 2518 JVM_END 2519 2520 2521 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2522 Klass* k = get_klass_considering_redefinition(cls, thread); 2523 // types will have length zero if this is not an InstanceKlass 2524 // (length is determined by call to JVM_GetClassCPEntriesCount) 2525 if (k->is_instance_klass()) { 2526 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2527 for (int index = cp->length() - 1; index >= 0; index--) { 2528 constantTag tag = cp->tag_at(index); 2529 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2530 } 2531 } 2532 JVM_END 2533 2534 2535 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2536 Klass* k = get_klass_considering_redefinition(cls, thread); 2537 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2538 JVM_END 2539 2540 2541 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2542 Klass* k = get_klass_considering_redefinition(cls, thread); 2543 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2544 JVM_END 2545 2546 2547 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2548 Klass* k = get_klass_considering_redefinition(cls, thread); 2549 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2550 JVM_END 2551 2552 2553 // The following methods, used for the verifier, are never called with 2554 // array klasses, so a direct cast to InstanceKlass is safe. 2555 // Typically, these methods are called in a loop with bounds determined 2556 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2557 // zero for arrays. 2558 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2559 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2560 Method* method = ik->methods()->at(method_index); 2561 int length = method->checked_exceptions_length(); 2562 if (length > 0) { 2563 CheckedExceptionElement* table= method->checked_exceptions_start(); 2564 for (int i = 0; i < length; i++) { 2565 exceptions[i] = table[i].class_cp_index; 2566 } 2567 } 2568 JVM_END 2569 2570 2571 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2572 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2573 Method* method = ik->methods()->at(method_index); 2574 return method->checked_exceptions_length(); 2575 JVM_END 2576 2577 2578 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2579 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2580 Method* method = ik->methods()->at(method_index); 2581 memcpy(code, method->code_base(), method->code_size()); 2582 JVM_END 2583 2584 2585 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2586 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2587 Method* method = ik->methods()->at(method_index); 2588 return method->code_size(); 2589 JVM_END 2590 2591 2592 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2593 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2594 Method* method = ik->methods()->at(method_index); 2595 ExceptionTable extable(method); 2596 entry->start_pc = extable.start_pc(entry_index); 2597 entry->end_pc = extable.end_pc(entry_index); 2598 entry->handler_pc = extable.handler_pc(entry_index); 2599 entry->catchType = extable.catch_type_index(entry_index); 2600 JVM_END 2601 2602 2603 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2604 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2605 Method* method = ik->methods()->at(method_index); 2606 return method->exception_table_length(); 2607 JVM_END 2608 2609 2610 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2611 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2612 Method* method = ik->methods()->at(method_index); 2613 return method->access_flags().as_method_flags(); 2614 JVM_END 2615 2616 2617 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2618 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2619 return ik->field_access_flags(field_index); 2620 JVM_END 2621 2622 2623 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2624 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2625 Method* method = ik->methods()->at(method_index); 2626 return method->max_locals(); 2627 JVM_END 2628 2629 2630 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2631 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2632 Method* method = ik->methods()->at(method_index); 2633 return method->size_of_parameters(); 2634 JVM_END 2635 2636 2637 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2638 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2639 Method* method = ik->methods()->at(method_index); 2640 return method->verifier_max_stack(); 2641 JVM_END 2642 2643 2644 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2645 ResourceMark rm(THREAD); 2646 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2647 Method* method = ik->methods()->at(method_index); 2648 return method->is_object_constructor(); 2649 JVM_END 2650 2651 2652 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2653 ResourceMark rm(THREAD); 2654 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2655 Method* method = ik->methods()->at(method_index); 2656 return method->is_overpass(); 2657 JVM_END 2658 2659 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2660 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2661 Method* method = ik->methods()->at(method_index); 2662 return method->name()->as_utf8(); 2663 JVM_END 2664 2665 2666 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2667 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2668 Method* method = ik->methods()->at(method_index); 2669 return method->signature()->as_utf8(); 2670 JVM_END 2671 2672 /** 2673 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2674 * read entries in the constant pool. Since the old verifier always 2675 * works on a copy of the code, it will not see any rewriting that 2676 * may possibly occur in the middle of verification. So it is important 2677 * that nothing it calls tries to use the cpCache instead of the raw 2678 * constant pool, so we must use cp->uncached_x methods when appropriate. 2679 */ 2680 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2681 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2682 ConstantPool* cp = ik->constants(); 2683 switch (cp->tag_at(cp_index).value()) { 2684 case JVM_CONSTANT_Fieldref: 2685 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2686 default: 2687 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2688 } 2689 ShouldNotReachHere(); 2690 return nullptr; 2691 JVM_END 2692 2693 2694 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2695 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2696 ConstantPool* cp = ik->constants(); 2697 switch (cp->tag_at(cp_index).value()) { 2698 case JVM_CONSTANT_InterfaceMethodref: 2699 case JVM_CONSTANT_Methodref: 2700 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2701 default: 2702 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2703 } 2704 ShouldNotReachHere(); 2705 return nullptr; 2706 JVM_END 2707 2708 2709 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2710 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2711 ConstantPool* cp = ik->constants(); 2712 switch (cp->tag_at(cp_index).value()) { 2713 case JVM_CONSTANT_InterfaceMethodref: 2714 case JVM_CONSTANT_Methodref: 2715 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2716 default: 2717 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2718 } 2719 ShouldNotReachHere(); 2720 return nullptr; 2721 JVM_END 2722 2723 2724 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2725 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2726 ConstantPool* cp = ik->constants(); 2727 switch (cp->tag_at(cp_index).value()) { 2728 case JVM_CONSTANT_Fieldref: 2729 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2730 default: 2731 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2732 } 2733 ShouldNotReachHere(); 2734 return nullptr; 2735 JVM_END 2736 2737 2738 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2739 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2740 ConstantPool* cp = ik->constants(); 2741 Symbol* classname = cp->klass_name_at(cp_index); 2742 return classname->as_utf8(); 2743 JVM_END 2744 2745 2746 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2747 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2748 ConstantPool* cp = ik->constants(); 2749 switch (cp->tag_at(cp_index).value()) { 2750 case JVM_CONSTANT_Fieldref: { 2751 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2752 Symbol* classname = cp->klass_name_at(class_index); 2753 return classname->as_utf8(); 2754 } 2755 default: 2756 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2757 } 2758 ShouldNotReachHere(); 2759 return nullptr; 2760 JVM_END 2761 2762 2763 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2764 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2765 ConstantPool* cp = ik->constants(); 2766 switch (cp->tag_at(cp_index).value()) { 2767 case JVM_CONSTANT_Methodref: 2768 case JVM_CONSTANT_InterfaceMethodref: { 2769 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2770 Symbol* classname = cp->klass_name_at(class_index); 2771 return classname->as_utf8(); 2772 } 2773 default: 2774 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2775 } 2776 ShouldNotReachHere(); 2777 return nullptr; 2778 JVM_END 2779 2780 2781 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2782 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2783 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread); 2784 ConstantPool* cp = ik->constants(); 2785 ConstantPool* cp_called = ik_called->constants(); 2786 switch (cp->tag_at(cp_index).value()) { 2787 case JVM_CONSTANT_Fieldref: { 2788 Symbol* name = cp->uncached_name_ref_at(cp_index); 2789 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2790 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) { 2791 if (fs.name() == name && fs.signature() == signature) { 2792 return fs.access_flags().as_field_flags(); 2793 } 2794 } 2795 return -1; 2796 } 2797 default: 2798 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2799 } 2800 ShouldNotReachHere(); 2801 return 0; 2802 JVM_END 2803 2804 2805 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2806 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2807 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread); 2808 ConstantPool* cp = ik->constants(); 2809 switch (cp->tag_at(cp_index).value()) { 2810 case JVM_CONSTANT_Methodref: 2811 case JVM_CONSTANT_InterfaceMethodref: { 2812 Symbol* name = cp->uncached_name_ref_at(cp_index); 2813 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2814 Array<Method*>* methods = ik_called->methods(); 2815 int methods_count = methods->length(); 2816 for (int i = 0; i < methods_count; i++) { 2817 Method* method = methods->at(i); 2818 if (method->name() == name && method->signature() == signature) { 2819 return method->access_flags().as_method_flags(); 2820 } 2821 } 2822 return -1; 2823 } 2824 default: 2825 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2826 } 2827 ShouldNotReachHere(); 2828 return 0; 2829 JVM_END 2830 2831 2832 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2833 2834 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2835 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2836 JVM_END 2837 2838 2839 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2840 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2841 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2842 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2843 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2844 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2845 JVM_END 2846 2847 // Printing support ////////////////////////////////////////////////// 2848 extern "C" { 2849 2850 ATTRIBUTE_PRINTF(3, 0) 2851 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2852 // Reject count values that are negative signed values converted to 2853 // unsigned; see bug 4399518, 4417214 2854 if ((intptr_t)count <= 0) return -1; 2855 2856 int result = os::vsnprintf(str, count, fmt, args); 2857 if (result > 0 && (size_t)result >= count) { 2858 result = -1; 2859 } 2860 2861 return result; 2862 } 2863 2864 ATTRIBUTE_PRINTF(3, 4) 2865 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2866 va_list args; 2867 int len; 2868 va_start(args, fmt); 2869 len = jio_vsnprintf(str, count, fmt, args); 2870 va_end(args); 2871 return len; 2872 } 2873 2874 ATTRIBUTE_PRINTF(2, 3) 2875 int jio_fprintf(FILE* f, const char *fmt, ...) { 2876 int len; 2877 va_list args; 2878 va_start(args, fmt); 2879 len = jio_vfprintf(f, fmt, args); 2880 va_end(args); 2881 return len; 2882 } 2883 2884 ATTRIBUTE_PRINTF(2, 0) 2885 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2886 if (Arguments::vfprintf_hook() != nullptr) { 2887 return Arguments::vfprintf_hook()(f, fmt, args); 2888 } else { 2889 return vfprintf(f, fmt, args); 2890 } 2891 } 2892 2893 ATTRIBUTE_PRINTF(1, 2) 2894 JNIEXPORT int jio_printf(const char *fmt, ...) { 2895 int len; 2896 va_list args; 2897 va_start(args, fmt); 2898 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2899 va_end(args); 2900 return len; 2901 } 2902 2903 // HotSpot specific jio method 2904 void jio_print(const char* s, size_t len) { 2905 // Try to make this function as atomic as possible. 2906 if (Arguments::vfprintf_hook() != nullptr) { 2907 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2908 } else { 2909 // Make an unused local variable to avoid warning from gcc compiler. 2910 bool dummy = os::write(defaultStream::output_fd(), s, len); 2911 } 2912 } 2913 2914 } // Extern C 2915 2916 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2917 2918 // In most of the JVM thread support functions we need to access the 2919 // thread through a ThreadsListHandle to prevent it from exiting and 2920 // being reclaimed while we try to operate on it. The exceptions to this 2921 // rule are when operating on the current thread, or if the monitor of 2922 // the target java.lang.Thread is locked at the Java level - in both 2923 // cases the target cannot exit. 2924 2925 static void thread_entry(JavaThread* thread, TRAPS) { 2926 HandleMark hm(THREAD); 2927 Handle obj(THREAD, thread->threadObj()); 2928 JavaValue result(T_VOID); 2929 JavaCalls::call_virtual(&result, 2930 obj, 2931 vmClasses::Thread_klass(), 2932 vmSymbols::run_method_name(), 2933 vmSymbols::void_method_signature(), 2934 THREAD); 2935 } 2936 2937 2938 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2939 #if INCLUDE_CDS 2940 if (CDSConfig::allow_only_single_java_thread()) { 2941 // During java -Xshare:dump, if we allow multiple Java threads to 2942 // execute in parallel, symbols and classes may be loaded in 2943 // random orders which will make the resulting CDS archive 2944 // non-deterministic. 2945 // 2946 // Lucikly, during java -Xshare:dump, it's important to run only 2947 // the code in the main Java thread (which is NOT started here) that 2948 // creates the module graph, etc. It's safe to not start the other 2949 // threads which are launched by class static initializers 2950 // (ReferenceHandler, FinalizerThread and CleanerImpl). 2951 if (log_is_enabled(Info, aot)) { 2952 ResourceMark rm; 2953 oop t = JNIHandles::resolve_non_null(jthread); 2954 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 2955 } 2956 return; 2957 } 2958 #endif 2959 JavaThread *native_thread = nullptr; 2960 2961 // We cannot hold the Threads_lock when we throw an exception, 2962 // due to rank ordering issues. Example: we might need to grab the 2963 // Heap_lock while we construct the exception. 2964 bool throw_illegal_thread_state = false; 2965 2966 // We must release the Threads_lock before we can post a jvmti event 2967 // in Thread::start. 2968 { 2969 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock); 2970 // Ensure that the C++ Thread and OSThread structures aren't freed before 2971 // we operate. 2972 MutexLocker ml(Threads_lock); 2973 2974 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2975 // re-starting an already started thread, so we should usually find 2976 // that the JavaThread is null. However for a JNI attached thread 2977 // there is a small window between the Thread object being created 2978 // (with its JavaThread set) and the update to its threadStatus, so we 2979 // have to check for this 2980 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 2981 throw_illegal_thread_state = true; 2982 } else { 2983 jlong size = 2984 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2985 // Allocate the C++ Thread structure and create the native thread. The 2986 // stack size retrieved from java is 64-bit signed, but the constructor takes 2987 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2988 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2989 // - Avoid passing negative values which would result in really large stacks. 2990 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2991 size_t sz = size > 0 ? (size_t) size : 0; 2992 native_thread = new JavaThread(&thread_entry, sz); 2993 2994 // At this point it may be possible that no osthread was created for the 2995 // JavaThread due to lack of memory. Check for this situation and throw 2996 // an exception if necessary. Eventually we may want to change this so 2997 // that we only grab the lock if the thread was created successfully - 2998 // then we can also do this check and throw the exception in the 2999 // JavaThread constructor. 3000 if (native_thread->osthread() != nullptr) { 3001 // Note: the current thread is not being used within "prepare". 3002 native_thread->prepare(jthread); 3003 } 3004 } 3005 } 3006 3007 if (throw_illegal_thread_state) { 3008 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3009 } 3010 3011 assert(native_thread != nullptr, "Starting null thread?"); 3012 3013 if (native_thread->osthread() == nullptr) { 3014 ResourceMark rm(thread); 3015 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 3016 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 3017 // No one should hold a reference to the 'native_thread'. 3018 native_thread->smr_delete(); 3019 if (JvmtiExport::should_post_resource_exhausted()) { 3020 JvmtiExport::post_resource_exhausted( 3021 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3022 os::native_thread_creation_failed_msg()); 3023 } 3024 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3025 os::native_thread_creation_failed_msg()); 3026 } 3027 3028 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3029 3030 Thread::start(native_thread); 3031 3032 JVM_END 3033 3034 3035 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3036 ThreadsListHandle tlh(thread); 3037 oop java_thread = nullptr; 3038 JavaThread* receiver = nullptr; 3039 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3040 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3041 3042 if (is_alive) { 3043 // jthread refers to a live JavaThread. 3044 Thread::set_priority(receiver, (ThreadPriority)prio); 3045 } 3046 // Implied else: If the JavaThread hasn't started yet, then the 3047 // priority set in the java.lang.Thread object above will be pushed 3048 // down when it does start. 3049 JVM_END 3050 3051 3052 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3053 HOTSPOT_THREAD_YIELD(); 3054 os::naked_yield(); 3055 JVM_END 3056 3057 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos)) 3058 if (nanos < 0) { 3059 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range"); 3060 } 3061 3062 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3063 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3064 } 3065 3066 // Save current thread state and restore it at the end of this block. 3067 // And set new thread state to SLEEPING. 3068 JavaThreadSleepState jtss(thread); 3069 3070 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC); 3071 3072 if (nanos == 0) { 3073 os::naked_yield(); 3074 } else { 3075 ThreadState old_state = thread->osthread()->get_state(); 3076 thread->osthread()->set_state(SLEEPING); 3077 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed 3078 // An asynchronous exception could have been thrown on 3079 // us while we were sleeping. We do not overwrite those. 3080 if (!HAS_PENDING_EXCEPTION) { 3081 HOTSPOT_THREAD_SLEEP_END(1); 3082 if (!thread->has_async_exception_condition()) { 3083 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3084 // to properly restore the thread state. That's likely wrong. 3085 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3086 } 3087 } 3088 } 3089 thread->osthread()->set_state(old_state); 3090 } 3091 HOTSPOT_THREAD_SLEEP_END(0); 3092 JVM_END 3093 3094 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3095 oop jthread = thread->threadObj(); 3096 assert(jthread != nullptr, "no current carrier thread!"); 3097 return JNIHandles::make_local(THREAD, jthread); 3098 JVM_END 3099 3100 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3101 oop theThread = thread->vthread(); 3102 assert(theThread != (oop)nullptr, "no current thread!"); 3103 return JNIHandles::make_local(THREAD, theThread); 3104 JVM_END 3105 3106 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3107 jobject theThread)) 3108 oop threadObj = JNIHandles::resolve(theThread); 3109 thread->set_vthread(threadObj); 3110 3111 // Set _monitor_owner_id of new current Thread 3112 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj)); 3113 3114 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3115 JVM_END 3116 3117 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3118 return ThreadIdentifier::unsafe_offset(); 3119 JVM_END 3120 3121 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3122 ThreadsListHandle tlh(thread); 3123 JavaThread* receiver = nullptr; 3124 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3125 if (is_alive) { 3126 // jthread refers to a live JavaThread. 3127 receiver->interrupt(); 3128 } 3129 JVM_END 3130 3131 // Return true iff the current thread has locked the object passed in 3132 3133 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3134 if (obj == nullptr) { 3135 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3136 } 3137 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3138 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3139 JVM_END 3140 3141 JVM_ENTRY(jobjectArray, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3142 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD); 3143 return (jobjectArray) JNIHandles::make_local(THREAD, trace); 3144 JVM_END 3145 3146 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread)) 3147 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD); 3148 return JNIHandles::make_local(THREAD, snapshot); 3149 JVM_END 3150 3151 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3152 // We don't use a ThreadsListHandle here because the current thread 3153 // must be alive. 3154 oop java_thread = JNIHandles::resolve_non_null(jthread); 3155 JavaThread* thr = java_lang_Thread::thread(java_thread); 3156 if (thread == thr && !thr->has_attached_via_jni()) { 3157 // Thread naming is only supported for the current thread and 3158 // we don't set the name of an attached thread to avoid stepping 3159 // on other programs. 3160 ResourceMark rm(thread); 3161 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3162 os::set_native_thread_name(thread_name); 3163 } 3164 JVM_END 3165 3166 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3167 oop theCache = thread->scopedValueCache(); 3168 return JNIHandles::make_local(THREAD, theCache); 3169 JVM_END 3170 3171 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3172 jobject theCache)) 3173 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3174 thread->set_scopedValueCache(objs); 3175 JVM_END 3176 3177 3178 // java.lang.Package //////////////////////////////////////////////////////////////// 3179 3180 3181 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3182 ResourceMark rm(THREAD); 3183 JvmtiVMObjectAllocEventCollector oam; 3184 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3185 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3186 return (jstring) JNIHandles::make_local(THREAD, result); 3187 JVM_END 3188 3189 3190 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3191 JvmtiVMObjectAllocEventCollector oam; 3192 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3193 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3194 JVM_END 3195 3196 3197 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3198 3199 3200 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3201 MonitorLocker ml(Heap_lock); 3202 oop ref = Universe::reference_pending_list(); 3203 if (ref != nullptr) { 3204 Universe::clear_reference_pending_list(); 3205 } 3206 return JNIHandles::make_local(THREAD, ref); 3207 JVM_END 3208 3209 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3210 MonitorLocker ml(Heap_lock); 3211 return Universe::has_reference_pending_list(); 3212 JVM_END 3213 3214 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3215 MonitorLocker ml(Heap_lock); 3216 while (!Universe::has_reference_pending_list()) { 3217 ml.wait(); 3218 } 3219 JVM_END 3220 3221 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref)) 3222 oop ref_oop = JNIHandles::resolve_non_null(ref); 3223 // PhantomReference has its own implementation of get(). 3224 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3225 oop referent = java_lang_ref_Reference::weak_referent(ref_oop); 3226 return JNIHandles::make_local(THREAD, referent); 3227 JVM_END 3228 3229 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3230 oop ref_oop = JNIHandles::resolve_non_null(ref); 3231 // PhantomReference has its own implementation of refersTo(). 3232 // See: JVM_PhantomReferenceRefersTo 3233 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3234 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3235 return referent == JNIHandles::resolve(o); 3236 JVM_END 3237 3238 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3239 oop ref_oop = JNIHandles::resolve_non_null(ref); 3240 // FinalReference has it's own implementation of clear(). 3241 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3242 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3243 // If the referent has already been cleared then done. 3244 // However, if the referent is dead but has not yet been cleared by 3245 // concurrent reference processing, it should NOT be cleared here. 3246 // Instead, clearing should be left to the GC. Clearing it here could 3247 // detectably lose an expected notification, which is impossible with 3248 // STW reference processing. The clearing in enqueue() doesn't have 3249 // this problem, since the enqueue covers the notification, but it's not 3250 // worth the effort to handle that case specially. 3251 return; 3252 } 3253 java_lang_ref_Reference::clear_referent(ref_oop); 3254 JVM_END 3255 3256 3257 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3258 3259 3260 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3261 oop ref_oop = JNIHandles::resolve_non_null(ref); 3262 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3263 return referent == JNIHandles::resolve(o); 3264 JVM_END 3265 3266 3267 // ObjectInputStream /////////////////////////////////////////////////////////////// 3268 3269 // Return the first user-defined class loader up the execution stack, or null 3270 // if only code from the bootstrap or platform class loader is on the stack. 3271 3272 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3273 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3274 InstanceKlass* ik = vfst.method()->method_holder(); 3275 oop loader = ik->class_loader(); 3276 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3277 return JNIHandles::make_local(THREAD, loader); 3278 } 3279 } 3280 return nullptr; 3281 JVM_END 3282 3283 3284 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3285 3286 3287 // resolve array handle and check arguments 3288 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3289 if (arr == nullptr) { 3290 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3291 } 3292 oop a = JNIHandles::resolve_non_null(arr); 3293 if (!a->is_array()) { 3294 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3295 } else if (type_array_only && !a->is_typeArray()) { 3296 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3297 } 3298 return arrayOop(a); 3299 } 3300 3301 3302 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3303 arrayOop a = check_array(env, arr, false, CHECK_0); 3304 return a->length(); 3305 JVM_END 3306 3307 3308 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3309 JvmtiVMObjectAllocEventCollector oam; 3310 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3311 jvalue value; 3312 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3313 oop box = Reflection::box(&value, type, CHECK_NULL); 3314 return JNIHandles::make_local(THREAD, box); 3315 JVM_END 3316 3317 3318 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3319 jvalue value; 3320 value.i = 0; // to initialize value before getting used in CHECK 3321 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3322 assert(a->is_typeArray(), "just checking"); 3323 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3324 BasicType wide_type = (BasicType) wCode; 3325 if (type != wide_type) { 3326 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3327 } 3328 return value; 3329 JVM_END 3330 3331 3332 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3333 arrayOop a = check_array(env, arr, false, CHECK); 3334 oop box = JNIHandles::resolve(val); 3335 jvalue value; 3336 value.i = 0; // to initialize value before getting used in CHECK 3337 BasicType value_type; 3338 if (a->is_objArray()) { 3339 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3340 value_type = Reflection::unbox_for_regular_object(box, &value); 3341 } else { 3342 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3343 } 3344 Reflection::array_set(&value, a, index, value_type, CHECK); 3345 JVM_END 3346 3347 3348 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3349 arrayOop a = check_array(env, arr, true, CHECK); 3350 assert(a->is_typeArray(), "just checking"); 3351 BasicType value_type = (BasicType) vCode; 3352 Reflection::array_set(&v, a, index, value_type, CHECK); 3353 JVM_END 3354 3355 3356 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3357 JvmtiVMObjectAllocEventCollector oam; 3358 oop element_mirror = JNIHandles::resolve(eltClass); 3359 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3360 return JNIHandles::make_local(THREAD, result); 3361 JVM_END 3362 3363 3364 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3365 JvmtiVMObjectAllocEventCollector oam; 3366 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3367 oop element_mirror = JNIHandles::resolve(eltClass); 3368 assert(dim_array->is_typeArray(), "just checking"); 3369 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3370 return JNIHandles::make_local(THREAD, result); 3371 JVM_END 3372 3373 3374 // Library support /////////////////////////////////////////////////////////////////////////// 3375 3376 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3377 return ZipLibrary::handle(); 3378 JVM_END 3379 3380 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3381 //%note jvm_ct 3382 char ebuf[1024]; 3383 void *load_result; 3384 { 3385 ThreadToNativeFromVM ttnfvm(thread); 3386 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3387 } 3388 if (load_result == nullptr) { 3389 if (throwException) { 3390 char msg[1024]; 3391 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3392 // Since 'ebuf' may contain a string encoded using 3393 // platform encoding scheme, we need to pass 3394 // Exceptions::unsafe_to_utf8 to the new_exception method 3395 // as the last argument. See bug 6367357. 3396 Handle h_exception = 3397 Exceptions::new_exception(thread, 3398 vmSymbols::java_lang_UnsatisfiedLinkError(), 3399 msg, Exceptions::unsafe_to_utf8); 3400 3401 THROW_HANDLE_NULL(h_exception); 3402 } else { 3403 log_info(library)("Failed to load library %s", name); 3404 return load_result; 3405 } 3406 } 3407 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3408 return load_result; 3409 JVM_END 3410 3411 3412 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3413 os::dll_unload(handle); 3414 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3415 JVM_END 3416 3417 3418 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3419 void* find_result = os::dll_lookup(handle, name); 3420 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3421 find_result != nullptr ? "Found" : "Failed to find", 3422 name, p2i(handle)); 3423 return find_result; 3424 JVM_END 3425 3426 3427 // JNI version /////////////////////////////////////////////////////////////////////////////// 3428 3429 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3430 return Threads::is_supported_jni_version_including_1_1(version); 3431 JVM_END 3432 3433 3434 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3435 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3436 JVM_END 3437 3438 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3439 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3440 JVM_END 3441 3442 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void)) 3443 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE; 3444 JVM_END 3445 3446 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void)) 3447 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE; 3448 JVM_END 3449 3450 // String support /////////////////////////////////////////////////////////////////////////// 3451 3452 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3453 JvmtiVMObjectAllocEventCollector oam; 3454 if (str == nullptr) return nullptr; 3455 oop string = JNIHandles::resolve_non_null(str); 3456 oop result = StringTable::intern(string, CHECK_NULL); 3457 return (jstring) JNIHandles::make_local(THREAD, result); 3458 JVM_END 3459 3460 3461 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3462 3463 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3464 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3465 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3466 // in the safepoint protocol, thread suspension, thread interruption, or most things of that 3467 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has 3468 // shutdown. JavaThreads will be "in native" when using this API from JDK code. 3469 3470 3471 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3472 VM_Exit::block_if_vm_exited(); 3473 return new PlatformMutex(); 3474 } 3475 3476 3477 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3478 VM_Exit::block_if_vm_exited(); 3479 delete ((PlatformMutex*) mon); 3480 } 3481 3482 3483 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3484 VM_Exit::block_if_vm_exited(); 3485 ((PlatformMutex*) mon)->lock(); 3486 return 0; 3487 } 3488 3489 3490 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3491 VM_Exit::block_if_vm_exited(); 3492 ((PlatformMutex*) mon)->unlock(); 3493 } 3494 3495 3496 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3497 3498 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3499 Handle loader, jboolean throwError, TRAPS) { 3500 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL); 3501 3502 // Check if we should initialize the class 3503 if (init && klass->is_instance_klass()) { 3504 klass->initialize(CHECK_NULL); 3505 } 3506 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3507 } 3508 3509 3510 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3511 3512 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3513 Handle method_handle; 3514 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3515 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3516 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3517 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3518 assert(args() == nullptr || !args->is_flatArray(), "args are never flat"); 3519 3520 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3521 jobject res = JNIHandles::make_local(THREAD, result); 3522 if (JvmtiExport::should_post_vm_object_alloc()) { 3523 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3524 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3525 if (java_lang_Class::is_primitive(ret_type)) { 3526 // Only for primitive type vm allocates memory for java object. 3527 // See box() method. 3528 JvmtiExport::post_vm_object_alloc(thread, result); 3529 } 3530 } 3531 return res; 3532 } else { 3533 THROW_NULL(vmSymbols::java_lang_StackOverflowError()); 3534 } 3535 JVM_END 3536 3537 3538 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3539 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3540 assert(args() == nullptr || !args->is_flatArray(), "args are never flat"); 3541 oop constructor_mirror = JNIHandles::resolve(c); 3542 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3543 jobject res = JNIHandles::make_local(THREAD, result); 3544 if (JvmtiExport::should_post_vm_object_alloc()) { 3545 JvmtiExport::post_vm_object_alloc(thread, result); 3546 } 3547 return res; 3548 JVM_END 3549 3550 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3551 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3552 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3553 JVM_END 3554 3555 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3556 jclass caller, 3557 jstring interfaceMethodName, 3558 jobject factoryType, 3559 jobject interfaceMethodType, 3560 jobject implementationMember, 3561 jobject dynamicMethodType, 3562 jclass lambdaProxyClass)) 3563 #if INCLUDE_CDS 3564 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) { 3565 return; 3566 } 3567 3568 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller)); 3569 if (caller_ik->is_hidden()) { 3570 // Hidden classes not of type lambda proxy classes are currently not being archived. 3571 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3572 // registered for archiving. 3573 return; 3574 } 3575 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass)); 3576 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3577 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3578 3579 Symbol* interface_method_name = nullptr; 3580 if (interfaceMethodName != nullptr) { 3581 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3582 } 3583 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3584 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3585 3586 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3587 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3588 3589 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3590 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3591 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3592 3593 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3594 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3595 3596 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3597 interface_method_type, m, dynamic_method_type, THREAD); 3598 #endif // INCLUDE_CDS 3599 JVM_END 3600 3601 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3602 jclass caller, 3603 jstring interfaceMethodName, 3604 jobject factoryType, 3605 jobject interfaceMethodType, 3606 jobject implementationMember, 3607 jobject dynamicMethodType)) 3608 #if INCLUDE_CDS 3609 3610 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3611 implementationMember == nullptr || dynamicMethodType == nullptr) { 3612 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3613 } 3614 3615 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller)); 3616 if (!caller_ik->in_aot_cache()) { 3617 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3618 return nullptr; 3619 } 3620 3621 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3622 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3623 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3624 3625 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3626 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3627 3628 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3629 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3630 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3631 3632 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3633 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3634 3635 InstanceKlass* loaded_lambda = 3636 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3637 interface_method_type, m, dynamic_method_type, 3638 CHECK_(nullptr)); 3639 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3640 #else 3641 return nullptr; 3642 #endif // INCLUDE_CDS 3643 JVM_END 3644 3645 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3646 if (CDSConfig::is_dumping_static_archive()) { 3647 // We do this so that the default CDS archive can be deterministic. 3648 const char* release = VM_Version::vm_release(); 3649 const char* dbg_level = VM_Version::jdk_debug_level(); 3650 const char* version = VM_Version::internal_vm_info_string(); 3651 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3652 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3653 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3654 seed += (jlong)VM_Version::vm_major_version(); 3655 seed += (jlong)VM_Version::vm_minor_version(); 3656 seed += (jlong)VM_Version::vm_security_version(); 3657 seed += (jlong)VM_Version::vm_patch_version(); 3658 if (seed == 0) { // don't let this ever be zero. 3659 seed = 0x87654321; 3660 } 3661 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3662 return seed; 3663 } else { 3664 return 0; 3665 } 3666 JVM_END 3667 3668 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus()) 3669 return CDSConfig::get_status(); 3670 JVM_END 3671 3672 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3673 #if INCLUDE_CDS 3674 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity"); 3675 if (line != nullptr) { 3676 ResourceMark rm(THREAD); 3677 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3678 char* c_line = java_lang_String::as_utf8_string(h_line()); 3679 if (CDSConfig::is_dumping_dynamic_archive()) { 3680 // Note: LambdaFormInvokers::append take same format which is not 3681 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3682 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3683 } 3684 if (ClassListWriter::is_enabled()) { 3685 ClassListWriter w; 3686 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line); 3687 } 3688 } 3689 #endif // INCLUDE_CDS 3690 JVM_END 3691 3692 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3693 #if INCLUDE_CDS 3694 ResourceMark rm(THREAD); 3695 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3696 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3697 AOTMetaspace::dump_loaded_classes(file_name, THREAD); 3698 #endif // INCLUDE_CDS 3699 JVM_END 3700 3701 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3702 #if INCLUDE_CDS 3703 ResourceMark rm(THREAD); 3704 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3705 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3706 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3707 #endif // INCLUDE_CDS 3708 JVM_END 3709 3710 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls)) 3711 #if INCLUDE_CDS 3712 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3713 if (!k->is_instance_klass()) { 3714 return false; 3715 } else { 3716 if (InstanceKlass::cast(k)->is_enum_subclass() || 3717 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) { 3718 // This class will be cached in AOT-initialized state. No need for init barriers. 3719 return false; 3720 } else { 3721 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles 3722 // must emit barriers to ensure class initialization during production run. 3723 ResourceMark rm(THREAD); 3724 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name()); 3725 return true; 3726 } 3727 } 3728 #else 3729 return false; 3730 #endif // INCLUDE_CDS 3731 JVM_END 3732 3733 // Returns an array of all live Thread objects (VM internal JavaThreads, 3734 // jvmti agent threads, and JNI attaching threads are skipped) 3735 // See CR 6404306 regarding JNI attaching threads 3736 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3737 ResourceMark rm(THREAD); 3738 ThreadsListEnumerator tle(THREAD, false, false); 3739 JvmtiVMObjectAllocEventCollector oam; 3740 3741 int num_threads = tle.num_threads(); 3742 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3743 objArrayHandle threads_ah(THREAD, r); 3744 3745 for (int i = 0; i < num_threads; i++) { 3746 Handle h = tle.get_threadObj(i); 3747 threads_ah->obj_at_put(i, h()); 3748 } 3749 3750 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3751 JVM_END 3752 3753 3754 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3755 // Return StackTraceElement[][], each element is the stack trace of a thread in 3756 // the corresponding entry in the given threads array 3757 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3758 JvmtiVMObjectAllocEventCollector oam; 3759 3760 // Check if threads is null 3761 if (threads == nullptr) { 3762 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3763 } 3764 3765 refArrayOop a = oop_cast<refArrayOop>(JNIHandles::resolve_non_null(threads)); 3766 refArrayHandle ah(THREAD, a); 3767 int num_threads = ah->length(); 3768 // check if threads is non-empty array 3769 if (num_threads == 0) { 3770 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3771 } 3772 3773 // check if threads is not an array of objects of Thread class 3774 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3775 if (k != vmClasses::Thread_klass()) { 3776 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3777 } 3778 3779 ResourceMark rm(THREAD); 3780 3781 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3782 for (int i = 0; i < num_threads; i++) { 3783 oop thread_obj = ah->obj_at(i); 3784 instanceHandle h(THREAD, (instanceOop) thread_obj); 3785 thread_handle_array->append(h); 3786 } 3787 3788 // The JavaThread references in thread_handle_array are validated 3789 // in VM_ThreadDump::doit(). 3790 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3791 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3792 3793 JVM_END 3794 3795 // JVM monitoring and management support 3796 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3797 return Management::get_jmm_interface(version); 3798 JVM_END 3799 3800 // com.sun.tools.attach.VirtualMachine agent properties support 3801 // 3802 // Initialize the agent properties with the properties maintained in the VM 3803 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3804 ResourceMark rm; 3805 3806 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3807 3808 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3809 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3810 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3811 return properties; 3812 JVM_END 3813 3814 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3815 { 3816 JvmtiVMObjectAllocEventCollector oam; 3817 3818 if (ofClass == nullptr) { 3819 return nullptr; 3820 } 3821 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3822 // Special handling for primitive objects 3823 if (java_lang_Class::is_primitive(mirror())) { 3824 return nullptr; 3825 } 3826 Klass* k = java_lang_Class::as_Klass(mirror()); 3827 if (!k->is_instance_klass()) { 3828 return nullptr; 3829 } 3830 InstanceKlass* ik = InstanceKlass::cast(k); 3831 int encl_method_class_idx = ik->enclosing_method_class_index(); 3832 if (encl_method_class_idx == 0) { 3833 return nullptr; 3834 } 3835 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3836 objArrayHandle dest(THREAD, dest_o); 3837 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3838 dest->obj_at_put(0, enc_k->java_mirror()); 3839 int encl_method_method_idx = ik->enclosing_method_method_index(); 3840 if (encl_method_method_idx != 0) { 3841 Symbol* sym = ik->constants()->symbol_at( 3842 extract_low_short_from_int( 3843 ik->constants()->name_and_type_at(encl_method_method_idx))); 3844 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3845 dest->obj_at_put(1, str()); 3846 sym = ik->constants()->symbol_at( 3847 extract_high_short_from_int( 3848 ik->constants()->name_and_type_at(encl_method_method_idx))); 3849 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3850 dest->obj_at_put(2, str()); 3851 } 3852 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3853 } 3854 JVM_END 3855 3856 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3857 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3858 ResourceMark rm(THREAD); 3859 3860 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3861 return nullptr; 3862 } 3863 3864 char** vm_flags = Arguments::jvm_flags_array(); 3865 char** vm_args = Arguments::jvm_args_array(); 3866 int num_flags = Arguments::num_jvm_flags(); 3867 int num_args = Arguments::num_jvm_args(); 3868 3869 InstanceKlass* ik = vmClasses::String_klass(); 3870 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3871 objArrayHandle result_h(THREAD, r); 3872 3873 int index = 0; 3874 for (int j = 0; j < num_flags; j++, index++) { 3875 stringStream prefixed; 3876 prefixed.print("-XX:%s", vm_flags[j]); 3877 Handle h = java_lang_String::create_from_platform_dependent_str(prefixed.base(), CHECK_NULL); 3878 result_h->obj_at_put(index, h()); 3879 } 3880 for (int i = 0; i < num_args; i++, index++) { 3881 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3882 result_h->obj_at_put(index, h()); 3883 } 3884 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 3885 JVM_END 3886 3887 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 3888 return os::get_signal_number(name); 3889 JVM_END 3890 3891 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread)) 3892 oop vt = JNIHandles::resolve_external_guard(vthread); 3893 MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/); 3894 JVM_END 3895 3896 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread)) 3897 oop vt = JNIHandles::resolve_external_guard(vthread); 3898 MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/); 3899 JVM_END 3900 3901 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount)) 3902 oop vt = JNIHandles::resolve_external_guard(vthread); 3903 MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/); 3904 JVM_END 3905 3906 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount)) 3907 oop vt = JNIHandles::resolve_external_guard(vthread); 3908 MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/); 3909 JVM_END 3910 3911 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section. 3912 // Needed to avoid deadlocks with JVMTI suspend mechanism. 3913 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter)) 3914 #if INCLUDE_JVMTI 3915 if (!DoJVMTIVirtualThreadTransitions) { 3916 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3917 return; 3918 } 3919 assert(thread->is_disable_suspend() != (bool)enter, 3920 "nested or unbalanced monitor enter/exit is not allowed"); 3921 thread->toggle_is_disable_suspend(); 3922 #endif 3923 JVM_END 3924 3925 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op)) 3926 #if INCLUDE_JFR 3927 freeze_result result = THREAD->last_freeze_fail_result(); 3928 assert(result != freeze_ok, "sanity check"); 3929 EventVirtualThreadPinned event(UNTIMED); 3930 event.set_starttime(THREAD->last_freeze_fail_time()); 3931 if (event.should_commit()) { 3932 ResourceMark rm(THREAD); 3933 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op)); 3934 THREAD->post_vthread_pinned_event(&event, str, result); 3935 } 3936 #endif 3937 JVM_END 3938 3939 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored)) 3940 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent(); 3941 assert(parkEvent != nullptr, "not initialized"); 3942 3943 OopHandle& list_head = ObjectMonitor::vthread_list_head(); 3944 oop vthread_head = nullptr; 3945 while (true) { 3946 if (list_head.peek() != nullptr) { 3947 for (;;) { 3948 oop head = list_head.resolve(); 3949 if (list_head.cmpxchg(head, nullptr) == head) { 3950 return JNIHandles::make_local(THREAD, head); 3951 } 3952 } 3953 } 3954 ThreadBlockInVM tbivm(THREAD); 3955 parkEvent->park(); 3956 } 3957 JVM_END 3958 3959 /* 3960 * Return the current class's class file version. The low order 16 bits of the 3961 * returned jint contain the class's major version. The high order 16 bits 3962 * contain the class's minor version. 3963 */ 3964 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 3965 oop mirror = JNIHandles::resolve_non_null(current); 3966 if (java_lang_Class::is_primitive(mirror)) { 3967 // return latest major version and minor version of 0. 3968 return JVM_CLASSFILE_MAJOR_VERSION; 3969 } 3970 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 3971 return (ik->minor_version() << 16) | ik->major_version(); 3972 JVM_END 3973 3974 /* 3975 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 3976 * get the value will see a materialized value and not a scalar-replaced 3977 * null value. 3978 */ 3979 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 3980 JVM_EnsureMaterializedForStackWalk(env, value); 3981 JVM_END 3982 3983 /* 3984 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded. 3985 */ 3986 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void)) 3987 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE; 3988 JVM_END --- EOF ---