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 #elif INCLUDE_JVMCI 397 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2" 398 #else 399 const char* compiler_name = ""; 400 #endif // compilers 401 #endif // COMPILER1_AND_COMPILER2 402 403 if (*compiler_name != '\0' && 404 (Arguments::mode() != Arguments::_int)) { 405 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 406 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 407 result_h->obj_at_put(ndx * 2, key_str()); 408 result_h->obj_at_put(ndx * 2 + 1, value_str()); 409 ndx++; 410 } 411 } 412 413 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 414 JVM_END 415 416 417 /* 418 * Return the temporary directory that the VM uses for the attach 419 * and perf data files. 420 * 421 * It is important that this directory is well-known and the 422 * same for all VM instances. It cannot be affected by configuration 423 * variables such as java.io.tmpdir. 424 */ 425 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 426 HandleMark hm(THREAD); 427 const char* temp_dir = os::get_temp_directory(); 428 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 429 return (jstring) JNIHandles::make_local(THREAD, h()); 430 JVM_END 431 432 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) { 433 if (len < 0) { 434 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative"); 435 } 436 elmClass->initialize(CHECK); 437 if (elmClass->is_array_klass() || elmClass->is_identity_class()) { 438 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class"); 439 } 440 if (elmClass->is_abstract()) { 441 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract"); 442 } 443 } 444 445 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to)) 446 oop o = JNIHandles::resolve_non_null(orig); 447 assert(o->is_array(), "Must be"); 448 oop array = nullptr; 449 arrayOop org = (arrayOop)o; 450 arrayHandle oh(THREAD, org); 451 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass()); 452 InlineKlass* vk = InlineKlass::cast(ak->element_klass()); 453 int len = to - from; // length of the new array 454 if (ak->is_null_free_array_klass()) { 455 if ((len != 0) && (from >= org->length() || to > org->length())) { 456 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements"); 457 } 458 } 459 if (ak->is_flatArray_klass()) { 460 // The whole JVM_CopyOfSpecialArray is currently broken. Fix this in a separate bugfix. 461 int org_length = org->length(); 462 int copy_len = MIN2(to, org_length) - MIN2(from, org_length); 463 FlatArrayKlass* const fak = FlatArrayKlass::cast(org->klass()); 464 flatArrayOop dst = fak->allocate_instance(len, CHECK_NULL); 465 assert(!ak->is_null_free_array_klass() || copy_len == len, 466 "Failed to throw the IllegalArgumentException"); 467 if (copy_len != 0) { 468 int start = MIN2(from, org_length - 1); 469 FlatArrayPayload src_payload(flatArrayOop(oh()), start, fak); 470 FlatArrayPayload dst_payload(dst, 0, fak); 471 int end = to < oh()->length() ? to : oh()->length(); 472 for (int i = from; i < end; i++) { 473 // Copy a value 474 src_payload.copy_to(dst_payload); 475 476 // Advance to the next element 477 src_payload.next_element(); 478 dst_payload.next_element(); 479 } 480 } 481 array = dst; 482 } else { 483 const ArrayProperties props = ArrayProperties::Default().with_null_restricted(ak->is_null_free_array_klass()); 484 485 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL); 486 int end = to < oh()->length() ? to : oh()->length(); 487 for (int i = from; i < end; i++) { 488 if (i < ((objArrayOop)oh())->length()) { 489 oop val = ((objArrayOop)oh())->obj_at(i, CHECK_NULL); 490 ((objArrayOop)array)->obj_at_put(i - from, val); 491 } else { 492 assert(!ak->is_null_free_array_klass(), "Must be a nullable array"); 493 ((objArrayOop)array)->obj_at_put(i - from, nullptr); 494 } 495 } 496 } 497 return (jarray) JNIHandles::make_local(THREAD, array); 498 JVM_END 499 500 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal)) 501 oop mirror = JNIHandles::resolve_non_null(elmClass); 502 oop init = JNIHandles::resolve(initVal); 503 if (init == nullptr) { 504 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null"); 505 } 506 Handle init_h(THREAD, init); 507 Klass* klass = java_lang_Class::as_Klass(mirror); 508 if (klass != init_h()->klass()) { 509 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value"); 510 } 511 validate_array_arguments(klass, len, CHECK_NULL); 512 const ArrayProperties props = ArrayProperties::Default() 513 .with_null_restricted() 514 .with_non_atomic(); 515 516 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL); 517 for (int i = 0; i < len; i++) { 518 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ ); 519 } 520 return (jarray) JNIHandles::make_local(THREAD, array); 521 JVM_END 522 523 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal)) 524 oop mirror = JNIHandles::resolve_non_null(elmClass); 525 oop init = JNIHandles::resolve(initVal); 526 if (init == nullptr) { 527 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null"); 528 } 529 Handle init_h(THREAD, init); 530 Klass* klass = java_lang_Class::as_Klass(mirror); 531 if (klass != init_h()->klass()) { 532 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value"); 533 } 534 validate_array_arguments(klass, len, CHECK_NULL); 535 const ArrayProperties props = ArrayProperties::Default().with_null_restricted(); 536 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL); 537 for (int i = 0; i < len; i++) { 538 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ ); 539 } 540 return (jarray) JNIHandles::make_local(THREAD, array); 541 JVM_END 542 543 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len)) 544 oop mirror = JNIHandles::resolve_non_null(elmClass); 545 Klass* klass = java_lang_Class::as_Klass(mirror); 546 klass->initialize(CHECK_NULL); 547 validate_array_arguments(klass, len, CHECK_NULL); 548 objArrayOop array = oopFactory::new_objArray(klass, len, ArrayProperties::Default(), CHECK_NULL); 549 return (jarray) JNIHandles::make_local(THREAD, array); 550 JVM_END 551 552 JVM_ENTRY(jarray, JVM_NewReferenceArray(JNIEnv *env, jclass elmClass, jint len)) 553 oop mirror = JNIHandles::resolve_non_null(elmClass); 554 Klass* klass = java_lang_Class::as_Klass(mirror); 555 validate_array_arguments(klass, len, CHECK_NULL); 556 refArrayOop array = oopFactory::new_refArray(klass, len, ArrayProperties::Default(), CHECK_NULL); 557 return (jarray) JNIHandles::make_local(THREAD, array); 558 JVM_END 559 560 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jarray array)) 561 oop o = JNIHandles::resolve_non_null(array); 562 Klass* klass = o->klass(); 563 564 return klass->is_flatArray_klass(); 565 JVM_END 566 567 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jarray array)) 568 oop o = JNIHandles::resolve_non_null(array); 569 Klass* klass = o->klass(); 570 571 assert(klass->is_objArray_klass(), "Expects an object array"); 572 573 return klass->is_null_free_array_klass(); 574 JVM_END 575 576 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jarray array)) 577 // There are multiple cases where an array can/must support atomic access: 578 // - the array is a reference array 579 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or NULL_FREE_ATOMIC_FLAT 580 // - the array is flat and its component type is naturally atomic 581 oop o = JNIHandles::resolve_non_null(array); 582 Klass* klass = o->klass(); 583 584 assert(klass->is_objArray_klass(), "Expects an object array"); 585 586 if (klass->is_refArray_klass()) { 587 return true; 588 } 589 590 if (klass->is_flatArray_klass()) { 591 FlatArrayKlass* fak = FlatArrayKlass::cast(klass); 592 if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) { 593 return true; 594 } 595 bool is_null_free = !LayoutKindHelper::is_nullable_flat(fak->layout_kind()); 596 if (fak->element_klass()->is_naturally_atomic(is_null_free)) { 597 return true; 598 } 599 600 return false; 601 } 602 603 ShouldNotReachHere(); 604 JVM_END 605 606 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 607 608 extern volatile jint vm_created; 609 610 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 611 EventShutdown event; 612 if (event.should_commit()) { 613 event.set_reason("Shutdown requested from Java"); 614 event.commit(); 615 } 616 JVM_END 617 618 619 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 620 before_exit(thread, true); 621 vm_exit(code); 622 JVM_END 623 624 625 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 626 if (!DisableExplicitGC) { 627 EventSystemGC event; 628 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent); 629 Universe::heap()->collect(GCCause::_java_lang_system_gc); 630 event.commit(); 631 } 632 JVM_END 633 634 635 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 636 return Universe::heap()->millis_since_last_whole_heap_examined(); 637 JVM_END 638 639 640 static inline jlong convert_size_t_to_jlong(size_t val) { 641 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 642 NOT_LP64 (return (jlong)val;) 643 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 644 } 645 646 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 647 size_t n = Universe::heap()->capacity(); 648 return convert_size_t_to_jlong(n); 649 JVM_END 650 651 652 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 653 size_t n = Universe::heap()->unused(); 654 return convert_size_t_to_jlong(n); 655 JVM_END 656 657 658 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 659 size_t n = Universe::heap()->max_capacity(); 660 return convert_size_t_to_jlong(n); 661 JVM_END 662 663 664 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 665 return os::active_processor_count(); 666 JVM_END 667 668 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void)) 669 #ifdef LINUX 670 if (UseContainerSupport) { 671 return JNI_TRUE; 672 } 673 #endif 674 return JNI_FALSE; 675 JVM_END 676 677 JVM_LEAF(jboolean, JVM_IsContainerized(void)) 678 if (os::is_containerized()) { 679 return JNI_TRUE; 680 } 681 return JNI_FALSE; 682 JVM_END 683 684 // java.lang.Throwable ////////////////////////////////////////////////////// 685 686 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 687 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 688 java_lang_Throwable::fill_in_stack_trace(exception); 689 JVM_END 690 691 // java.lang.NullPointerException /////////////////////////////////////////// 692 693 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 694 if (!ShowCodeDetailsInExceptionMessages) return nullptr; 695 696 oop exc = JNIHandles::resolve_non_null(throwable); 697 698 Method* method; 699 int bci; 700 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 701 return nullptr; 702 } 703 if (method->is_native()) { 704 return nullptr; 705 } 706 707 stringStream ss; 708 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 709 if (ok) { 710 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 711 return (jstring) JNIHandles::make_local(THREAD, result); 712 } else { 713 return nullptr; 714 } 715 JVM_END 716 717 // java.lang.StackTraceElement ////////////////////////////////////////////// 718 719 720 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth)) 721 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace)); 722 refArrayOop st = refArrayOop(JNIHandles::resolve(elements)); 723 refArrayHandle stack_trace(THREAD, st); 724 // Fill in the allocated stack trace 725 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK); 726 JVM_END 727 728 729 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 730 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 731 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 732 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK); 733 JVM_END 734 735 736 // java.lang.StackWalker ////////////////////////////////////////////////////// 737 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj)) 738 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj)); 739 740 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr); 741 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr); 742 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info()); 743 if (!have_name) { 744 oop name = StringTable::intern(method->name(), CHECK); 745 java_lang_StackFrameInfo::set_name(stack_frame_info(), name); 746 } 747 if (!have_type) { 748 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK); 749 java_lang_StackFrameInfo::set_type(stack_frame_info(), type()); 750 } 751 JVM_END 752 753 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode, 754 jint skip_frames, jobject contScope, jobject cont, 755 jint buffer_size, jint start_index, jobjectArray frames)) 756 if (!thread->has_last_Java_frame()) { 757 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr); 758 } 759 760 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 761 Handle contScope_h(THREAD, JNIHandles::resolve(contScope)); 762 Handle cont_h(THREAD, JNIHandles::resolve(cont)); 763 // frames array is a ClassFrameInfo[] array when only getting caller reference, 764 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 765 // be null. 766 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames)); 767 refArrayHandle frames_array_h(THREAD, fa); 768 769 if (frames_array_h->length() < buffer_size) { 770 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr); 771 } 772 773 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h, 774 buffer_size, start_index, frames_array_h, CHECK_NULL); 775 return JNIHandles::make_local(THREAD, result); 776 JVM_END 777 778 779 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor, 780 jint last_batch_count, jint buffer_size, jint start_index, 781 jobjectArray frames)) 782 // frames array is a ClassFrameInfo[] array when only getting caller reference, 783 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 784 // be null. 785 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames)); 786 refArrayHandle frames_array_h(THREAD, fa); 787 788 if (frames_array_h->length() < buffer_size) { 789 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 790 } 791 792 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 793 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size, 794 start_index, frames_array_h, THREAD); 795 JVM_END 796 797 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont)) 798 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames)); 799 refArrayHandle frames_array_h(THREAD, fa); 800 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 801 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont)); 802 803 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD); 804 JVM_END 805 806 // java.lang.Object /////////////////////////////////////////////// 807 808 809 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 810 // as implemented in the classic virtual machine; return 0 if object is null 811 if (handle == nullptr) { 812 return 0; 813 } 814 oop obj = JNIHandles::resolve_non_null(handle); 815 if (Arguments::is_valhalla_enabled() && obj->klass()->is_inline_klass()) { 816 const intptr_t obj_identity_hash = obj->mark().hash(); 817 // Check if mark word contains hash code already. 818 // It is possible that the generated identity hash is 0, which is not 819 // distinct from the no_hash value. In such a case, the hash will be 820 // computed and set every time JVM_IHashCode is called. If that happens, 821 // the only consequence is losing out on the optimization. 822 if (obj_identity_hash != markWord::no_hash) { 823 return checked_cast<jint>(obj_identity_hash); 824 } 825 826 // Compute hash by calling ValueObjectMethods.valueObjectHashCode. 827 // The identity hash is invariantly immutable (see its JavaDoc comment). 828 JavaValue result(T_INT); 829 JavaCallArguments args; 830 Handle ho(THREAD, obj); 831 args.push_oop(ho); 832 methodHandle method(THREAD, Universe::value_object_hash_code_method()); 833 JavaCalls::call(&result, method, &args, THREAD); 834 Exceptions::wrap_exception_in_internal_error("Internal error in hashCode", CHECK_0); 835 836 const intptr_t identity_hash = result.get_jint(); 837 838 // We now have to set the hash via CAS. It's possible that this will race 839 // other threads. By our invariant of immutability, when there is a 840 // race, the identity hash code is going to be one of the following: 841 // a) 0, another thread updated other markWord bits; b) identity_hash set 842 // by another thread; or c) identity_hash set by the current thread. 843 // A nonzero identity hash code that is not the identity_hash computed 844 // earlier indicates a violation of the invariant. 845 markWord current_mark, old_mark, new_mark; 846 do { 847 current_mark = ho->mark(); 848 new_mark = current_mark.copy_set_hash(identity_hash); 849 old_mark = ho->cas_set_mark(new_mark, current_mark); 850 assert(old_mark.has_no_hash() || old_mark.hash() == new_mark.hash(), 851 "CAS identity hash invariant violated, expected=" INTPTR_FORMAT " actual=" INTPTR_FORMAT, 852 new_mark.hash(), 853 old_mark.hash()); 854 } while (old_mark != current_mark); 855 856 return checked_cast<jint>(new_mark.hash()); 857 } else { 858 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj)); 859 } 860 JVM_END 861 862 863 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 864 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 865 ObjectSynchronizer::wait(obj, ms, CHECK); 866 JVM_END 867 868 869 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 870 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 871 ObjectSynchronizer::notify(obj, CHECK); 872 JVM_END 873 874 875 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 876 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 877 ObjectSynchronizer::notifyall(obj, CHECK); 878 JVM_END 879 880 881 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 882 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 883 Klass* klass = obj->klass(); 884 JvmtiVMObjectAllocEventCollector oam; 885 886 #ifdef ASSERT 887 // Just checking that the cloneable flag is set correct 888 if (obj->is_array()) { 889 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 890 } else { 891 guarantee(obj->is_instance(), "should be instanceOop"); 892 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 893 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 894 } 895 #endif 896 897 // Check if class of obj supports the Cloneable interface. 898 // All arrays are considered to be cloneable (See JLS 20.1.5). 899 // All j.l.r.Reference classes are considered non-cloneable. 900 if (!klass->is_cloneable() || 901 (klass->is_instance_klass() && 902 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 903 ResourceMark rm(THREAD); 904 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 905 } 906 907 if (klass->is_inline_klass()) { 908 // Value instances have no identity, so return the current instance instead of allocating a new one 909 // Value classes cannot have finalizers, so the method can return immediately 910 return JNIHandles::make_local(THREAD, obj()); 911 } 912 913 // Make shallow object copy 914 const size_t size = obj->size(); 915 oop new_obj_oop = nullptr; 916 if (obj->is_array()) { 917 const int length = ((arrayOop)obj())->length(); 918 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 919 /* do_zero */ true, CHECK_NULL); 920 } else { 921 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 922 } 923 924 HeapAccess<>::clone(obj(), new_obj_oop, size); 925 926 Handle new_obj(THREAD, new_obj_oop); 927 // Caution: this involves a java upcall, so the clone should be 928 // "gc-robust" by this stage. 929 if (klass->has_finalizer()) { 930 assert(obj->is_instance(), "should be instanceOop"); 931 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 932 new_obj = Handle(THREAD, new_obj_oop); 933 } 934 935 return JNIHandles::make_local(THREAD, new_obj()); 936 JVM_END 937 938 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 939 940 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 941 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 942 JVM_END 943 944 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 945 return InstanceKlass::is_finalization_enabled(); 946 JVM_END 947 948 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 949 950 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 951 CONT_RegisterNativeMethods(env, cls); 952 JVM_END 953 954 // java.io.File /////////////////////////////////////////////////////////////// 955 956 JVM_LEAF(char*, JVM_NativePath(char* path)) 957 return os::native_path(path); 958 JVM_END 959 960 961 // Misc. class handling /////////////////////////////////////////////////////////// 962 963 964 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 965 // Getting the class of the caller frame. 966 // 967 // The call stack at this point looks something like this: 968 // 969 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ] 970 // [1] [ @CallerSensitive API.method ] 971 // [.] [ (skipped intermediate frames) ] 972 // [n] [ caller ] 973 vframeStream vfst(thread); 974 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 975 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 976 Method* m = vfst.method(); 977 assert(m != nullptr, "sanity"); 978 switch (n) { 979 case 0: 980 // This must only be called from Reflection.getCallerClass 981 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 982 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 983 } 984 // fall-through 985 case 1: 986 // Frame 0 and 1 must be caller sensitive. 987 if (!m->caller_sensitive()) { 988 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 989 } 990 break; 991 default: 992 if (!m->is_ignored_by_security_stack_walk()) { 993 // We have reached the desired frame; return the holder class. 994 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 995 } 996 break; 997 } 998 } 999 return nullptr; 1000 JVM_END 1001 1002 1003 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 1004 oop mirror = nullptr; 1005 BasicType t = name2type(utf); 1006 if (t != T_ILLEGAL && !is_reference_type(t)) { 1007 mirror = Universe::java_mirror(t); 1008 } 1009 if (mirror == nullptr) { 1010 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 1011 } else { 1012 return (jclass) JNIHandles::make_local(THREAD, mirror); 1013 } 1014 JVM_END 1015 1016 1017 // Returns a class loaded by the bootstrap class loader; or null 1018 // if not found. ClassNotFoundException is not thrown. 1019 // FindClassFromBootLoader is exported to the launcher for windows. 1020 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 1021 const char* name)) 1022 // Java libraries should ensure that name is never null or illegal. 1023 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 1024 // It's impossible to create this class; the name cannot fit 1025 // into the constant pool. 1026 return nullptr; 1027 } 1028 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name"); 1029 1030 TempNewSymbol h_name = SymbolTable::new_symbol(name); 1031 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 1032 if (k == nullptr) { 1033 return nullptr; 1034 } 1035 1036 if (log_is_enabled(Debug, class, resolve)) { 1037 trace_class_resolution(k); 1038 } 1039 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1040 JVM_END 1041 1042 // Find a class with this name in this loader. 1043 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name, 1044 jboolean init, jobject loader)) 1045 TempNewSymbol h_name = 1046 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 1047 CHECK_NULL); 1048 1049 oop loader_oop = JNIHandles::resolve(loader); 1050 Handle h_loader(THREAD, loader_oop); 1051 1052 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 1053 false, THREAD); 1054 1055 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1056 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 1057 } 1058 return result; 1059 JVM_END 1060 1061 // Currently only called from the old verifier. 1062 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 1063 jboolean init, jclass from)) 1064 TempNewSymbol h_name = 1065 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 1066 CHECK_NULL); 1067 oop from_class_oop = JNIHandles::resolve(from); 1068 assert(from_class_oop != nullptr, "must be"); 1069 Klass* from_class = java_lang_Class::as_Klass(from_class_oop); 1070 assert(from_class != nullptr, "must be"); 1071 oop class_loader = from_class->class_loader(); 1072 1073 Handle h_loader(THREAD, class_loader); 1074 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread); 1075 1076 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1077 // this function is generally only used for class loading during verification. 1078 ResourceMark rm; 1079 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name(); 1080 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name(); 1081 log_debug(class, resolve)("%s %s (verification)", from_name, to_name); 1082 } 1083 1084 #if INCLUDE_CDS 1085 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) { 1086 InstanceKlass* ik = InstanceKlass::cast(from_class); 1087 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name); 1088 } 1089 #endif 1090 1091 return result; 1092 JVM_END 1093 1094 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 1095 static jclass jvm_define_class_common(const char *name, 1096 jobject loader, const jbyte *buf, 1097 jsize len, jobject pd, const char *source, 1098 TRAPS) { 1099 if (source == nullptr) source = "__JVM_DefineClass__"; 1100 1101 JavaThread* jt = THREAD; 1102 1103 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 1104 ClassLoader::perf_define_appclass_selftime(), 1105 ClassLoader::perf_define_appclasses(), 1106 jt->get_thread_stat()->perf_recursion_counts_addr(), 1107 jt->get_thread_stat()->perf_timers_addr(), 1108 PerfClassTraceTime::DEFINE_CLASS); 1109 1110 if (UsePerfData) { 1111 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 1112 } 1113 1114 // Class resolution will get the class name from the .class stream if the name is null. 1115 TempNewSymbol class_name = name == nullptr ? nullptr : 1116 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1117 CHECK_NULL); 1118 1119 ResourceMark rm(THREAD); 1120 ClassFileStream st((u1*)buf, len, source); 1121 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 1122 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1123 ClassLoadInfo cl_info(protection_domain); 1124 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 1125 class_loader, 1126 cl_info, 1127 CHECK_NULL); 1128 1129 if (log_is_enabled(Debug, class, resolve)) { 1130 trace_class_resolution(k); 1131 } 1132 1133 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1134 } 1135 1136 enum { 1137 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 1138 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 1139 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 1140 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 1141 }; 1142 1143 /* 1144 * Define a class with the specified flags that indicates if it's a nestmate, 1145 * hidden, or strongly referenced from class loader. 1146 */ 1147 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 1148 const jbyte *buf, jsize len, jobject pd, 1149 jboolean init, int flags, jobject classData, TRAPS) { 1150 ResourceMark rm(THREAD); 1151 1152 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup)); 1153 // Lookup class must not be a primitive class (whose mirror has a null Klass*) 1154 if (lookup_k == nullptr) { 1155 // The error message is wrong. We come here only if lookup is a primitive class 1156 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1157 } 1158 1159 Handle class_loader (THREAD, lookup_k->class_loader()); 1160 1161 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 1162 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1163 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1164 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1165 1166 InstanceKlass* host_class = nullptr; 1167 if (is_nestmate) { 1168 host_class = lookup_k->nest_host(CHECK_NULL); 1169 } 1170 1171 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1172 name, 1173 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1174 is_nestmate ? host_class->external_name() : "", 1175 is_hidden ? "hidden" : "not hidden", 1176 is_strong ? "strong" : "weak", 1177 vm_annotations ? "with vm annotations" : "without vm annotation"); 1178 1179 if (!is_hidden) { 1180 // classData is only applicable for hidden classes 1181 if (classData != nullptr) { 1182 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1183 } 1184 if (is_nestmate) { 1185 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1186 } 1187 if (!is_strong) { 1188 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1189 } 1190 if (vm_annotations) { 1191 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1192 } 1193 if (flags != STRONG_LOADER_LINK) { 1194 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1195 err_msg("invalid flag 0x%x", flags)); 1196 } 1197 } 1198 1199 // Class resolution will get the class name from the .class stream if the name is null. 1200 TempNewSymbol class_name = name == nullptr ? nullptr : 1201 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1202 CHECK_NULL); 1203 1204 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1205 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1206 ClassFileStream st((u1*)buf, len, source); 1207 1208 InstanceKlass* ik = nullptr; 1209 if (!is_hidden) { 1210 ClassLoadInfo cl_info(protection_domain); 1211 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1212 class_loader, 1213 cl_info, 1214 CHECK_NULL); 1215 1216 if (log_is_enabled(Debug, class, resolve)) { 1217 trace_class_resolution(ik); 1218 } 1219 } else { // hidden 1220 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1221 ClassLoadInfo cl_info(protection_domain, 1222 host_class, 1223 classData_h, 1224 is_hidden, 1225 is_strong, 1226 vm_annotations); 1227 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1228 class_loader, 1229 cl_info, 1230 CHECK_NULL); 1231 1232 // The hidden class loader data has been artificially been kept alive to 1233 // this point. The mirror and any instances of this class have to keep 1234 // it alive afterwards. 1235 ik->class_loader_data()->dec_keep_alive_ref_count(); 1236 1237 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1238 ModuleEntry* module = ik->module(); 1239 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1240 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1241 module_name, 1242 ik->external_name(), 1243 host_class->external_name(), 1244 ik->is_hidden() ? "is hidden" : "is not hidden"); 1245 } 1246 } 1247 1248 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) { 1249 // non-hidden class or nestmate class must be in the same package as the Lookup class 1250 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages"); 1251 } 1252 1253 if (init) { 1254 ik->initialize(CHECK_NULL); 1255 } else { 1256 ik->link_class(CHECK_NULL); 1257 } 1258 1259 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1260 } 1261 1262 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1263 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1264 JVM_END 1265 1266 /* 1267 * Define a class with the specified lookup class. 1268 * lookup: Lookup class 1269 * name: the name of the class 1270 * buf: class bytes 1271 * len: length of class bytes 1272 * pd: protection domain 1273 * init: initialize the class 1274 * flags: properties of the class 1275 * classData: private static pre-initialized field 1276 */ 1277 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1278 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1279 1280 if (lookup == nullptr) { 1281 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1282 } 1283 1284 assert(buf != nullptr, "buf must not be null"); 1285 1286 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1287 JVM_END 1288 1289 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1290 1291 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1292 JVM_END 1293 1294 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1295 ResourceMark rm(THREAD); 1296 1297 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1298 char* str = java_lang_String::as_utf8_string(h_name()); 1299 1300 // Sanity check, don't expect null 1301 if (str == nullptr) return nullptr; 1302 1303 // Internalize the string, converting '.' to '/' in string. 1304 char* p = (char*)str; 1305 while (*p != '\0') { 1306 if (*p == '.') { 1307 *p = '/'; 1308 } 1309 p++; 1310 } 1311 1312 const int str_len = (int)(p - str); 1313 if (str_len > Symbol::max_length()) { 1314 // It's impossible to create this class; the name cannot fit 1315 // into the constant pool. 1316 return nullptr; 1317 } 1318 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1319 1320 // Security Note: 1321 // The Java level wrapper will perform the necessary security check allowing 1322 // us to pass the null as the initiating class loader. 1323 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1324 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader); 1325 #if INCLUDE_CDS 1326 if (k == nullptr) { 1327 // If the class is not already loaded, try to see if it's in the shared 1328 // archive for the current classloader (h_loader). 1329 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1330 } 1331 #endif 1332 return (k == nullptr) ? nullptr : 1333 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1334 JVM_END 1335 1336 // Module support ////////////////////////////////////////////////////////////////////////////// 1337 1338 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1339 jstring location, jobjectArray packages)) 1340 Handle h_module (THREAD, JNIHandles::resolve(module)); 1341 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1342 JVM_END 1343 1344 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1345 Handle h_module (THREAD, JNIHandles::resolve(module)); 1346 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1347 JVM_END 1348 1349 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1350 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1351 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1352 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1353 JVM_END 1354 1355 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1356 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1357 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1358 JVM_END 1359 1360 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1361 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1362 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1363 JVM_END 1364 1365 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1366 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1367 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1368 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1369 JVM_END 1370 1371 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1372 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1373 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1374 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1375 JVM_END 1376 1377 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1378 1379 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1380 assert (cls != nullptr, "illegal class"); 1381 JvmtiVMObjectAllocEventCollector oam; 1382 ResourceMark rm(THREAD); 1383 HandleMark hm(THREAD); 1384 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1385 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1386 return (jstring) JNIHandles::make_local(THREAD, result); 1387 JVM_END 1388 1389 1390 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1391 JvmtiVMObjectAllocEventCollector oam; 1392 oop mirror = JNIHandles::resolve_non_null(cls); 1393 1394 // Special handling for primitive objects 1395 if (java_lang_Class::is_primitive(mirror)) { 1396 // Primitive objects does not have any interfaces 1397 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1398 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1399 } 1400 1401 Klass* klass = java_lang_Class::as_Klass(mirror); 1402 // Figure size of result array 1403 int size; 1404 if (klass->is_instance_klass()) { 1405 InstanceKlass* ik = InstanceKlass::cast(klass); 1406 size = ik->local_interfaces()->length(); 1407 } else { 1408 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1409 size = 2; 1410 } 1411 1412 // Allocate result array 1413 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1414 objArrayHandle result (THREAD, r); 1415 // Fill in result 1416 if (klass->is_instance_klass()) { 1417 // Regular instance klass, fill in all local interfaces 1418 for (int index = 0; index < size; index++) { 1419 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1420 result->obj_at_put(index, k->java_mirror()); 1421 } 1422 } else { 1423 // All arrays implement java.lang.Cloneable and java.io.Serializable 1424 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1425 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1426 } 1427 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1428 JVM_END 1429 1430 1431 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1432 oop mirror = JNIHandles::resolve_non_null(cls); 1433 if (java_lang_Class::is_primitive(mirror)) { 1434 return JNI_FALSE; 1435 } 1436 Klass* k = java_lang_Class::as_Klass(mirror); 1437 return k->is_hidden(); 1438 JVM_END 1439 1440 1441 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1442 ResourceMark rm(THREAD); 1443 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1444 JvmtiVMObjectAllocEventCollector oam; 1445 1446 // Iterate through Java frames 1447 vframeStream vfst(thread); 1448 for(; !vfst.at_end(); vfst.next()) { 1449 int loc = -1; 1450 // get method of frame 1451 Method* method = vfst.method(); 1452 1453 Symbol *name = method->name(); 1454 1455 InstanceKlass* holder = method->method_holder(); 1456 if (name == vmSymbols::runWith_method_name()) { 1457 if (holder == vmClasses::Thread_klass() 1458 || holder == vmClasses::ScopedValue_Carrier_klass()) { 1459 loc = 1; 1460 } 1461 } 1462 1463 if (loc != -1) { 1464 javaVFrame *frame = vfst.asJavaVFrame(); 1465 StackValueCollection* locals = frame->locals(); 1466 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot 1467 Handle result = head_sv->get_obj(); 1468 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1469 if (result() != nullptr) { 1470 return JNIHandles::make_local(THREAD, result()); 1471 } 1472 } 1473 } 1474 1475 return nullptr; 1476 JVM_END 1477 1478 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1479 JvmtiVMObjectAllocEventCollector oam; 1480 // ofClass is a reference to a java_lang_Class object. The mirror object 1481 // of an InstanceKlass 1482 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1483 if (java_lang_Class::is_primitive(ofMirror) || 1484 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1485 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1486 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1487 } 1488 1489 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1490 InnerClassesIterator iter(k); 1491 1492 if (iter.length() == 0) { 1493 // Neither an inner nor outer class 1494 oop result = oopFactory::new_refArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1495 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1496 } 1497 1498 // find inner class info 1499 constantPoolHandle cp(thread, k->constants()); 1500 int length = iter.length(); 1501 1502 // Allocate temp. result array 1503 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length / 4, CHECK_NULL); 1504 refArrayHandle result(THREAD, r); 1505 int members = 0; 1506 1507 for (; !iter.done(); iter.next()) { 1508 int ioff = iter.inner_class_info_index(); 1509 int ooff = iter.outer_class_info_index(); 1510 1511 if (ioff != 0 && ooff != 0) { 1512 // Check to see if the name matches the class we're looking for 1513 // before attempting to find the class. 1514 if (cp->klass_name_at_matches(k, ooff)) { 1515 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1516 if (outer_klass == k) { 1517 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1518 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1519 1520 // Throws an exception if outer klass has not declared k as 1521 // an inner klass 1522 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1523 1524 result->obj_at_put(members, inner_klass->java_mirror()); 1525 members++; 1526 } 1527 } 1528 } 1529 } 1530 1531 if (members != length) { 1532 // Return array of right length 1533 refArrayOop res = oopFactory::new_refArray(vmClasses::Class_klass(), members, CHECK_NULL); 1534 for(int i = 0; i < members; i++) { 1535 res->obj_at_put(i, result->obj_at(i)); 1536 } 1537 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1538 } 1539 1540 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1541 JVM_END 1542 1543 1544 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1545 { 1546 // ofClass is a reference to a java_lang_Class object. 1547 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1548 if (java_lang_Class::is_primitive(ofMirror)) { 1549 return nullptr; 1550 } 1551 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1552 if (!klass->is_instance_klass()) { 1553 return nullptr; 1554 } 1555 1556 bool inner_is_member = false; 1557 Klass* outer_klass 1558 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1559 if (outer_klass == nullptr) return nullptr; // already a top-level class 1560 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1561 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1562 } 1563 JVM_END 1564 1565 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1566 { 1567 oop mirror = JNIHandles::resolve_non_null(cls); 1568 if (java_lang_Class::is_primitive(mirror)) { 1569 return nullptr; 1570 } 1571 Klass* klass = java_lang_Class::as_Klass(mirror); 1572 if (!klass->is_instance_klass()) { 1573 return nullptr; 1574 } 1575 InstanceKlass* k = InstanceKlass::cast(klass); 1576 int ooff = 0, noff = 0; 1577 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1578 if (noff != 0) { 1579 constantPoolHandle i_cp(thread, k->constants()); 1580 Symbol* name = i_cp->symbol_at(noff); 1581 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1582 return (jstring) JNIHandles::make_local(THREAD, str()); 1583 } 1584 } 1585 return nullptr; 1586 } 1587 JVM_END 1588 1589 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1590 assert (cls != nullptr, "illegal class"); 1591 JvmtiVMObjectAllocEventCollector oam; 1592 ResourceMark rm(THREAD); 1593 oop mirror = JNIHandles::resolve_non_null(cls); 1594 // Return null for arrays and primitives 1595 if (!java_lang_Class::is_primitive(mirror)) { 1596 Klass* k = java_lang_Class::as_Klass(mirror); 1597 if (k->is_instance_klass()) { 1598 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1599 if (sym == nullptr) return nullptr; 1600 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1601 return (jstring) JNIHandles::make_local(THREAD, str()); 1602 } 1603 } 1604 return nullptr; 1605 JVM_END 1606 1607 1608 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1609 assert (cls != nullptr, "illegal class"); 1610 oop mirror = JNIHandles::resolve_non_null(cls); 1611 // Return null for arrays and primitives 1612 if (!java_lang_Class::is_primitive(mirror)) { 1613 Klass* k = java_lang_Class::as_Klass(mirror); 1614 if (k->is_instance_klass()) { 1615 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1616 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1617 } 1618 } 1619 return nullptr; 1620 JVM_END 1621 1622 1623 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1624 // some of this code was adapted from from jni_FromReflectedField 1625 1626 oop reflected = JNIHandles::resolve_non_null(field); 1627 oop mirror = java_lang_reflect_Field::clazz(reflected); 1628 int slot = java_lang_reflect_Field::slot(reflected); 1629 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1630 1631 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 1632 int offset = ik->field_offset(slot); 1633 1634 if (modifiers & JVM_ACC_STATIC) { 1635 // for static fields we only look in the current class 1636 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1637 assert(false, "cannot find static field"); 1638 return false; 1639 } 1640 } else { 1641 // for instance fields we start with the current class and work 1642 // our way up through the superclass chain 1643 if (!ik->find_field_from_offset(offset, false, &fd)) { 1644 assert(false, "cannot find instance field"); 1645 return false; 1646 } 1647 } 1648 return true; 1649 } 1650 1651 static Method* jvm_get_method_common(jobject method) { 1652 // some of this code was adapted from from jni_FromReflectedMethod 1653 1654 oop reflected = JNIHandles::resolve_non_null(method); 1655 oop mirror = nullptr; 1656 int slot = 0; 1657 1658 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1659 mirror = java_lang_reflect_Constructor::clazz(reflected); 1660 slot = java_lang_reflect_Constructor::slot(reflected); 1661 } else { 1662 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1663 "wrong type"); 1664 mirror = java_lang_reflect_Method::clazz(reflected); 1665 slot = java_lang_reflect_Method::slot(reflected); 1666 } 1667 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 1668 1669 Method* m = ik->method_with_idnum(slot); 1670 assert(m != nullptr, "cannot find method"); 1671 return m; // caller has to deal with null in product mode 1672 } 1673 1674 /* Type use annotations support (JDK 1.8) */ 1675 1676 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1677 assert (cls != nullptr, "illegal class"); 1678 ResourceMark rm(THREAD); 1679 // Return null for arrays and primitives 1680 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1681 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1682 if (k->is_instance_klass()) { 1683 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1684 if (type_annotations != nullptr) { 1685 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1686 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1687 } 1688 } 1689 } 1690 return nullptr; 1691 JVM_END 1692 1693 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1694 assert (method != nullptr, "illegal method"); 1695 // method is a handle to a java.lang.reflect.Method object 1696 Method* m = jvm_get_method_common(method); 1697 if (m == nullptr) { 1698 return nullptr; 1699 } 1700 1701 AnnotationArray* type_annotations = m->type_annotations(); 1702 if (type_annotations != nullptr) { 1703 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1704 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1705 } 1706 1707 return nullptr; 1708 JVM_END 1709 1710 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1711 assert (field != nullptr, "illegal field"); 1712 fieldDescriptor fd; 1713 bool gotFd = jvm_get_field_common(field, fd); 1714 if (!gotFd) { 1715 return nullptr; 1716 } 1717 1718 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1719 JVM_END 1720 1721 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1722 if (!cp->is_within_bounds(index)) { 1723 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1724 } 1725 } 1726 1727 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1728 { 1729 // method is a handle to a java.lang.reflect.Method object 1730 Method* method_ptr = jvm_get_method_common(method); 1731 methodHandle mh (THREAD, method_ptr); 1732 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1733 const int num_params = mh->method_parameters_length(); 1734 1735 if (num_params < 0) { 1736 // A -1 return value from method_parameters_length means there is no 1737 // parameter data. Return null to indicate this to the reflection 1738 // API. 1739 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1740 return (jobjectArray)nullptr; 1741 } else { 1742 // Otherwise, we return something up to reflection, even if it is 1743 // a zero-length array. Why? Because in some cases this can 1744 // trigger a MalformedParametersException. 1745 1746 // make sure all the symbols are properly formatted 1747 for (int i = 0; i < num_params; i++) { 1748 MethodParametersElement* params = mh->method_parameters_start(); 1749 int index = params[i].name_cp_index; 1750 constantPoolHandle cp(THREAD, mh->constants()); 1751 bounds_check(cp, index, CHECK_NULL); 1752 1753 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1754 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1755 "Wrong type at constant pool index"); 1756 } 1757 1758 } 1759 1760 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1761 objArrayHandle result (THREAD, result_oop); 1762 1763 for (int i = 0; i < num_params; i++) { 1764 MethodParametersElement* params = mh->method_parameters_start(); 1765 // For a 0 index, give a null symbol 1766 Symbol* sym = 0 != params[i].name_cp_index ? 1767 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1768 int flags = params[i].flags; 1769 oop param = Reflection::new_parameter(reflected_method, i, sym, 1770 flags, CHECK_NULL); 1771 result->obj_at_put(i, param); 1772 } 1773 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1774 } 1775 } 1776 JVM_END 1777 1778 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1779 1780 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1781 { 1782 JvmtiVMObjectAllocEventCollector oam; 1783 1784 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1785 // Exclude primitive types and array types 1786 if (java_lang_Class::is_primitive(ofMirror) || 1787 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1788 // Return empty array 1789 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1790 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1791 } 1792 1793 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1794 constantPoolHandle cp(THREAD, k->constants()); 1795 1796 // Ensure class is linked 1797 k->link_class(CHECK_NULL); 1798 1799 // Allocate result 1800 int num_fields; 1801 1802 if (publicOnly) { 1803 num_fields = 0; 1804 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1805 if (fs.access_flags().is_public()) ++num_fields; 1806 } 1807 } else { 1808 num_fields = k->java_fields_count(); 1809 } 1810 1811 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1812 objArrayHandle result (THREAD, r); 1813 1814 int out_idx = 0; 1815 fieldDescriptor fd; 1816 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1817 if (!publicOnly || fs.access_flags().is_public()) { 1818 fd.reinitialize(k, fs.to_FieldInfo()); 1819 oop field = Reflection::new_field(&fd, CHECK_NULL); 1820 result->obj_at_put(out_idx, field); 1821 ++out_idx; 1822 } 1823 } 1824 assert(out_idx == num_fields, "just checking"); 1825 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1826 } 1827 JVM_END 1828 1829 // A class is a record if and only if it is final and a direct subclass of 1830 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1831 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1832 { 1833 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1834 if (k != nullptr && k->is_instance_klass()) { 1835 InstanceKlass* ik = InstanceKlass::cast(k); 1836 return ik->is_record(); 1837 } else { 1838 return false; 1839 } 1840 } 1841 JVM_END 1842 1843 // Returns an array containing the components of the Record attribute, 1844 // or null if the attribute is not present. 1845 // 1846 // Note that this function returns the components of the Record attribute 1847 // even if the class is not a record. 1848 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1849 { 1850 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass)); 1851 1852 Array<RecordComponent*>* components = ik->record_components(); 1853 if (components != nullptr) { 1854 JvmtiVMObjectAllocEventCollector oam; 1855 constantPoolHandle cp(THREAD, ik->constants()); 1856 int length = components->length(); 1857 assert(length >= 0, "unexpected record_components length"); 1858 objArrayOop record_components = 1859 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1860 objArrayHandle components_h (THREAD, record_components); 1861 1862 for (int x = 0; x < length; x++) { 1863 RecordComponent* component = components->at(x); 1864 assert(component != nullptr, "unexpected null record component"); 1865 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1866 components_h->obj_at_put(x, component_oop); 1867 } 1868 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1869 } 1870 1871 return nullptr; 1872 } 1873 JVM_END 1874 1875 static jobjectArray get_class_declared_methods_helper( 1876 JNIEnv *env, 1877 jclass ofClass, jboolean publicOnly, 1878 bool want_constructor, 1879 Klass* klass, TRAPS) { 1880 1881 JvmtiVMObjectAllocEventCollector oam; 1882 1883 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1884 // Exclude primitive types and array types 1885 if (java_lang_Class::is_primitive(ofMirror) 1886 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1887 // Return empty array 1888 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1889 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1890 } 1891 1892 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1893 1894 // Ensure class is linked 1895 k->link_class(CHECK_NULL); 1896 1897 Array<Method*>* methods = k->methods(); 1898 int methods_length = methods->length(); 1899 1900 // Save original method_idnum in case of redefinition, which can change 1901 // the idnum of obsolete methods. The new method will have the same idnum 1902 // but if we refresh the methods array, the counts will be wrong. 1903 ResourceMark rm(THREAD); 1904 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1905 int num_methods = 0; 1906 1907 // Select methods matching the criteria. 1908 for (int i = 0; i < methods_length; i++) { 1909 Method* method = methods->at(i); 1910 if (want_constructor && !method->is_object_constructor()) { 1911 continue; 1912 } 1913 if (!want_constructor && 1914 (method->is_object_constructor() || method->is_class_initializer() || 1915 method->is_overpass())) { 1916 continue; 1917 } 1918 if (publicOnly && !method->is_public()) { 1919 continue; 1920 } 1921 idnums->push(method->method_idnum()); 1922 ++num_methods; 1923 } 1924 1925 // Allocate result 1926 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1927 objArrayHandle result (THREAD, r); 1928 1929 // Now just put the methods that we selected above, but go by their idnum 1930 // in case of redefinition. The methods can be redefined at any safepoint, 1931 // so above when allocating the oop array and below when creating reflect 1932 // objects. 1933 for (int i = 0; i < num_methods; i++) { 1934 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1935 if (method.is_null()) { 1936 // Method may have been deleted and seems this API can handle null 1937 // Otherwise should probably put a method that throws NSME 1938 result->obj_at_put(i, nullptr); 1939 } else { 1940 oop m; 1941 if (want_constructor) { 1942 assert(method->is_object_constructor(), "must be"); 1943 m = Reflection::new_constructor(method, CHECK_NULL); 1944 } else { 1945 m = Reflection::new_method(method, false, CHECK_NULL); 1946 } 1947 result->obj_at_put(i, m); 1948 } 1949 } 1950 1951 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1952 } 1953 1954 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1955 { 1956 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1957 /*want_constructor*/ false, 1958 vmClasses::reflect_Method_klass(), THREAD); 1959 } 1960 JVM_END 1961 1962 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1963 { 1964 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1965 /*want_constructor*/ true, 1966 vmClasses::reflect_Constructor_klass(), THREAD); 1967 } 1968 JVM_END 1969 1970 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1971 { 1972 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1973 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member)); 1974 return c->has_nestmate_access_to(m, THREAD); 1975 } 1976 JVM_END 1977 1978 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1979 { 1980 // current is not a primitive or array class 1981 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1982 InstanceKlass* host = c->nest_host(THREAD); 1983 return (jclass) (host == nullptr ? nullptr : 1984 JNIHandles::make_local(THREAD, host->java_mirror())); 1985 } 1986 JVM_END 1987 1988 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1989 { 1990 // current is not a primitive or array class 1991 ResourceMark rm(THREAD); 1992 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1993 InstanceKlass* host = c->nest_host(THREAD); 1994 1995 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 1996 c->external_name(), host->external_name()); 1997 { 1998 JvmtiVMObjectAllocEventCollector oam; 1999 Array<u2>* members = host->nest_members(); 2000 int length = members == nullptr ? 0 : members->length(); 2001 2002 log_trace(class, nestmates)(" - host has %d listed nest members", length); 2003 2004 // nest host is first in the array so make it one bigger 2005 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length + 1, CHECK_NULL); 2006 refArrayHandle result(THREAD, r); 2007 result->obj_at_put(0, host->java_mirror()); 2008 if (length != 0) { 2009 int count = 0; 2010 for (int i = 0; i < length; i++) { 2011 int cp_index = members->at(i); 2012 Klass* k = host->constants()->klass_at(cp_index, THREAD); 2013 if (HAS_PENDING_EXCEPTION) { 2014 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2015 return nullptr; // propagate VMEs 2016 } 2017 if (log_is_enabled(Trace, class, nestmates)) { 2018 stringStream ss; 2019 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2020 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2021 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2022 log_trace(class, nestmates)("%s", ss.as_string()); 2023 } 2024 CLEAR_PENDING_EXCEPTION; 2025 continue; 2026 } 2027 if (k->is_instance_klass()) { 2028 InstanceKlass* ik = InstanceKlass::cast(k); 2029 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2030 if (nest_host_k == host) { 2031 result->obj_at_put(count+1, k->java_mirror()); 2032 count++; 2033 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2034 } else { 2035 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2036 ik->external_name(), nest_host_k->external_name()); 2037 } 2038 } else { 2039 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2040 k->external_name()); 2041 } 2042 } 2043 if (count < length) { 2044 // we had invalid entries so we need to compact the array 2045 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2046 length + 1, count + 1); 2047 2048 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2049 count + 1, CHECK_NULL); 2050 objArrayHandle result2(THREAD, r2); 2051 for (int i = 0; i < count + 1; i++) { 2052 result2->obj_at_put(i, result->obj_at(i)); 2053 } 2054 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2055 } 2056 } 2057 else { 2058 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate"); 2059 } 2060 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2061 } 2062 } 2063 JVM_END 2064 2065 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2066 { 2067 oop mirror = JNIHandles::resolve_non_null(current); 2068 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2069 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 2070 2071 ResourceMark rm(THREAD); 2072 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2073 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2074 if (ik->is_sealed()) { 2075 JvmtiVMObjectAllocEventCollector oam; 2076 Array<u2>* subclasses = ik->permitted_subclasses(); 2077 int length = subclasses->length(); 2078 2079 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2080 2081 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length, CHECK_NULL); 2082 refArrayHandle result(THREAD, r); 2083 int count = 0; 2084 for (int i = 0; i < length; i++) { 2085 int cp_index = subclasses->at(i); 2086 Klass* k = ik->constants()->klass_at(cp_index, THREAD); 2087 if (HAS_PENDING_EXCEPTION) { 2088 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2089 return nullptr; // propagate VMEs 2090 } 2091 if (log_is_enabled(Trace, class, sealed)) { 2092 stringStream ss; 2093 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2094 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2095 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2096 log_trace(class, sealed)("%s", ss.as_string()); 2097 } 2098 2099 CLEAR_PENDING_EXCEPTION; 2100 continue; 2101 } 2102 if (k->is_instance_klass()) { 2103 result->obj_at_put(count++, k->java_mirror()); 2104 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2105 } 2106 } 2107 if (count < length) { 2108 // we had invalid entries so we need to compact the array 2109 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2110 count, CHECK_NULL); 2111 objArrayHandle result2(THREAD, r2); 2112 for (int i = 0; i < count; i++) { 2113 result2->obj_at_put(i, result->obj_at(i)); 2114 } 2115 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2116 } 2117 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2118 } else { 2119 return nullptr; 2120 } 2121 } 2122 JVM_END 2123 2124 // Constant pool access ////////////////////////////////////////////////////////// 2125 2126 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2127 { 2128 JvmtiVMObjectAllocEventCollector oam; 2129 oop mirror = JNIHandles::resolve_non_null(cls); 2130 // Return null for primitives and arrays 2131 if (!java_lang_Class::is_primitive(mirror)) { 2132 Klass* k = java_lang_Class::as_Klass(mirror); 2133 if (k->is_instance_klass()) { 2134 InstanceKlass* k_h = InstanceKlass::cast(k); 2135 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2136 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2137 return JNIHandles::make_local(THREAD, jcp()); 2138 } 2139 } 2140 return nullptr; 2141 } 2142 JVM_END 2143 2144 2145 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj)) 2146 { 2147 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2148 return cp->length(); 2149 } 2150 JVM_END 2151 2152 2153 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index)) 2154 { 2155 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2156 bounds_check(cp, index, CHECK_NULL); 2157 constantTag tag = cp->tag_at(index); 2158 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2159 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2160 } 2161 Klass* k = cp->klass_at(index, CHECK_NULL); 2162 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2163 } 2164 JVM_END 2165 2166 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2167 { 2168 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2169 bounds_check(cp, index, CHECK_NULL); 2170 constantTag tag = cp->tag_at(index); 2171 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2172 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2173 } 2174 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2175 if (k == nullptr) return nullptr; 2176 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2177 } 2178 JVM_END 2179 2180 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2181 constantTag tag = cp->tag_at(index); 2182 if (!tag.is_method() && !tag.is_interface_method()) { 2183 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2184 } 2185 int klass_ref = cp->uncached_klass_ref_index_at(index); 2186 Klass* k_o; 2187 if (force_resolution) { 2188 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2189 } else { 2190 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2191 if (k_o == nullptr) return nullptr; 2192 } 2193 InstanceKlass* k = InstanceKlass::cast(k_o); 2194 Symbol* name = cp->uncached_name_ref_at(index); 2195 Symbol* sig = cp->uncached_signature_ref_at(index); 2196 methodHandle m (THREAD, k->find_method(name, sig)); 2197 if (m.is_null()) { 2198 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2199 } 2200 oop method; 2201 if (m->is_object_constructor()) { 2202 method = Reflection::new_constructor(m, CHECK_NULL); 2203 } else { 2204 method = Reflection::new_method(m, true, CHECK_NULL); 2205 } 2206 return JNIHandles::make_local(THREAD, method); 2207 } 2208 2209 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index)) 2210 { 2211 JvmtiVMObjectAllocEventCollector oam; 2212 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2213 bounds_check(cp, index, CHECK_NULL); 2214 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2215 return res; 2216 } 2217 JVM_END 2218 2219 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2220 { 2221 JvmtiVMObjectAllocEventCollector oam; 2222 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2223 bounds_check(cp, index, CHECK_NULL); 2224 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2225 return res; 2226 } 2227 JVM_END 2228 2229 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2230 constantTag tag = cp->tag_at(index); 2231 if (!tag.is_field()) { 2232 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2233 } 2234 int klass_ref = cp->uncached_klass_ref_index_at(index); 2235 Klass* k_o; 2236 if (force_resolution) { 2237 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2238 } else { 2239 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2240 if (k_o == nullptr) return nullptr; 2241 } 2242 InstanceKlass* k = InstanceKlass::cast(k_o); 2243 Symbol* name = cp->uncached_name_ref_at(index); 2244 Symbol* sig = cp->uncached_signature_ref_at(index); 2245 fieldDescriptor fd; 2246 Klass* target_klass = k->find_field(name, sig, &fd); 2247 if (target_klass == nullptr) { 2248 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2249 } 2250 oop field = Reflection::new_field(&fd, CHECK_NULL); 2251 return JNIHandles::make_local(THREAD, field); 2252 } 2253 2254 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index)) 2255 { 2256 JvmtiVMObjectAllocEventCollector oam; 2257 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2258 bounds_check(cp, index, CHECK_NULL); 2259 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2260 return res; 2261 } 2262 JVM_END 2263 2264 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2265 { 2266 JvmtiVMObjectAllocEventCollector oam; 2267 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2268 bounds_check(cp, index, CHECK_NULL); 2269 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2270 return res; 2271 } 2272 JVM_END 2273 2274 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index)) 2275 { 2276 JvmtiVMObjectAllocEventCollector oam; 2277 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2278 bounds_check(cp, index, CHECK_NULL); 2279 constantTag tag = cp->tag_at(index); 2280 if (!tag.is_field_or_method()) { 2281 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2282 } 2283 int klass_ref = cp->uncached_klass_ref_index_at(index); 2284 Symbol* klass_name = cp->klass_name_at(klass_ref); 2285 Symbol* member_name = cp->uncached_name_ref_at(index); 2286 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2287 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2288 objArrayHandle dest(THREAD, dest_o); 2289 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2290 dest->obj_at_put(0, str()); 2291 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2292 dest->obj_at_put(1, str()); 2293 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2294 dest->obj_at_put(2, str()); 2295 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2296 } 2297 JVM_END 2298 2299 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index)) 2300 { 2301 JvmtiVMObjectAllocEventCollector oam; 2302 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2303 bounds_check(cp, index, CHECK_0); 2304 constantTag tag = cp->tag_at(index); 2305 if (!tag.is_field_or_method()) { 2306 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2307 } 2308 return (jint) cp->uncached_klass_ref_index_at(index); 2309 } 2310 JVM_END 2311 2312 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index)) 2313 { 2314 JvmtiVMObjectAllocEventCollector oam; 2315 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2316 bounds_check(cp, index, CHECK_0); 2317 constantTag tag = cp->tag_at(index); 2318 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2319 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2320 } 2321 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2322 } 2323 JVM_END 2324 2325 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index)) 2326 { 2327 JvmtiVMObjectAllocEventCollector oam; 2328 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2329 bounds_check(cp, index, CHECK_NULL); 2330 constantTag tag = cp->tag_at(index); 2331 if (!tag.is_name_and_type()) { 2332 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2333 } 2334 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2335 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2336 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2337 objArrayHandle dest(THREAD, dest_o); 2338 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2339 dest->obj_at_put(0, str()); 2340 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2341 dest->obj_at_put(1, str()); 2342 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2343 } 2344 JVM_END 2345 2346 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index)) 2347 { 2348 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2349 bounds_check(cp, index, CHECK_0); 2350 constantTag tag = cp->tag_at(index); 2351 if (!tag.is_int()) { 2352 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2353 } 2354 return cp->int_at(index); 2355 } 2356 JVM_END 2357 2358 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index)) 2359 { 2360 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2361 bounds_check(cp, index, CHECK_(0L)); 2362 constantTag tag = cp->tag_at(index); 2363 if (!tag.is_long()) { 2364 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2365 } 2366 return cp->long_at(index); 2367 } 2368 JVM_END 2369 2370 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index)) 2371 { 2372 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2373 bounds_check(cp, index, CHECK_(0.0f)); 2374 constantTag tag = cp->tag_at(index); 2375 if (!tag.is_float()) { 2376 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2377 } 2378 return cp->float_at(index); 2379 } 2380 JVM_END 2381 2382 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index)) 2383 { 2384 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2385 bounds_check(cp, index, CHECK_(0.0)); 2386 constantTag tag = cp->tag_at(index); 2387 if (!tag.is_double()) { 2388 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2389 } 2390 return cp->double_at(index); 2391 } 2392 JVM_END 2393 2394 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index)) 2395 { 2396 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2397 bounds_check(cp, index, CHECK_NULL); 2398 constantTag tag = cp->tag_at(index); 2399 if (!tag.is_string()) { 2400 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2401 } 2402 oop str = cp->string_at(index, CHECK_NULL); 2403 return (jstring) JNIHandles::make_local(THREAD, str); 2404 } 2405 JVM_END 2406 2407 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index)) 2408 { 2409 JvmtiVMObjectAllocEventCollector oam; 2410 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2411 bounds_check(cp, index, CHECK_NULL); 2412 constantTag tag = cp->tag_at(index); 2413 if (!tag.is_symbol()) { 2414 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2415 } 2416 Symbol* sym = cp->symbol_at(index); 2417 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2418 return (jstring) JNIHandles::make_local(THREAD, str()); 2419 } 2420 JVM_END 2421 2422 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index)) 2423 { 2424 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2425 bounds_check(cp, index, CHECK_0); 2426 constantTag tag = cp->tag_at(index); 2427 jbyte result = tag.value(); 2428 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2429 // they are changed to the corresponding tags from the JVM spec, so that java code in 2430 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2431 if (tag.is_klass_or_reference()) { 2432 result = JVM_CONSTANT_Class; 2433 } else if (tag.is_string_index()) { 2434 result = JVM_CONSTANT_String; 2435 } else if (tag.is_method_type_in_error()) { 2436 result = JVM_CONSTANT_MethodType; 2437 } else if (tag.is_method_handle_in_error()) { 2438 result = JVM_CONSTANT_MethodHandle; 2439 } else if (tag.is_dynamic_constant_in_error()) { 2440 result = JVM_CONSTANT_Dynamic; 2441 } 2442 return result; 2443 } 2444 JVM_END 2445 2446 // Assertion support. ////////////////////////////////////////////////////////// 2447 2448 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2449 assert(cls != nullptr, "bad class"); 2450 2451 oop r = JNIHandles::resolve(cls); 2452 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2453 if (java_lang_Class::is_primitive(r)) return false; 2454 2455 Klass* k = java_lang_Class::as_Klass(r); 2456 assert(k->is_instance_klass(), "must be an instance klass"); 2457 if (!k->is_instance_klass()) return false; 2458 2459 ResourceMark rm(THREAD); 2460 const char* name = k->name()->as_C_string(); 2461 bool system_class = k->class_loader() == nullptr; 2462 return JavaAssertions::enabled(name, system_class); 2463 2464 JVM_END 2465 2466 2467 // Return a new AssertionStatusDirectives object with the fields filled in with 2468 // command-line assertion arguments (i.e., -ea, -da). 2469 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2470 JvmtiVMObjectAllocEventCollector oam; 2471 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2472 return JNIHandles::make_local(THREAD, asd); 2473 JVM_END 2474 2475 // Verification //////////////////////////////////////////////////////////////////////////////// 2476 2477 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2478 2479 // RedefineClasses support: bug 6214132 caused verification to fail. 2480 // All functions from this section, unless noted otherwise, should call the functions 2481 // get_klass_considering_redefinition(), or 2482 // get_instance_klass_considering_redefinition() 2483 // These functions return JvmtiThreadState::_scratch_class if the verifier 2484 // was invoked in the middle of the redefinition of cls. 2485 // See jvmtiThreadState.hpp for details. 2486 2487 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) { 2488 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2489 if (k->is_instance_klass()) { 2490 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread); 2491 } else { 2492 return k; 2493 } 2494 } 2495 2496 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) { 2497 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls)); 2498 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread); 2499 } 2500 2501 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 2502 oop mirror = JNIHandles::resolve_non_null(cls); 2503 if (java_lang_Class::is_primitive(mirror)) { 2504 return JNI_FALSE; 2505 } 2506 Klass* k = java_lang_Class::as_Klass(mirror); 2507 // This isn't necessary since answer is the same because redefinition 2508 // has already checked this matches for the scratch class. 2509 // k = get_klass_considering_redefinition(cls, thread) 2510 jboolean result = k->is_interface(); 2511 assert(!result || k->is_instance_klass(), 2512 "all interfaces are instance types"); 2513 return result; 2514 JVM_END 2515 2516 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2517 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name. 2518 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2519 return k->name()->as_utf8(); 2520 JVM_END 2521 2522 2523 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2524 Klass* k = get_klass_considering_redefinition(cls, thread); 2525 // types will have length zero if this is not an InstanceKlass 2526 // (length is determined by call to JVM_GetClassCPEntriesCount) 2527 if (k->is_instance_klass()) { 2528 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2529 for (int index = cp->length() - 1; index >= 0; index--) { 2530 constantTag tag = cp->tag_at(index); 2531 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2532 } 2533 } 2534 JVM_END 2535 2536 2537 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2538 Klass* k = get_klass_considering_redefinition(cls, thread); 2539 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2540 JVM_END 2541 2542 2543 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2544 Klass* k = get_klass_considering_redefinition(cls, thread); 2545 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2546 JVM_END 2547 2548 2549 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2550 Klass* k = get_klass_considering_redefinition(cls, thread); 2551 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2552 JVM_END 2553 2554 2555 // The following methods, used for the verifier, are never called with 2556 // array klasses, so a direct cast to InstanceKlass is safe. 2557 // Typically, these methods are called in a loop with bounds determined 2558 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2559 // zero for arrays. 2560 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2561 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2562 Method* method = ik->methods()->at(method_index); 2563 int length = method->checked_exceptions_length(); 2564 if (length > 0) { 2565 CheckedExceptionElement* table= method->checked_exceptions_start(); 2566 for (int i = 0; i < length; i++) { 2567 exceptions[i] = table[i].class_cp_index; 2568 } 2569 } 2570 JVM_END 2571 2572 2573 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2574 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2575 Method* method = ik->methods()->at(method_index); 2576 return method->checked_exceptions_length(); 2577 JVM_END 2578 2579 2580 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2581 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2582 Method* method = ik->methods()->at(method_index); 2583 memcpy(code, method->code_base(), method->code_size()); 2584 JVM_END 2585 2586 2587 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2588 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2589 Method* method = ik->methods()->at(method_index); 2590 return method->code_size(); 2591 JVM_END 2592 2593 2594 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2595 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2596 Method* method = ik->methods()->at(method_index); 2597 ExceptionTable extable(method); 2598 entry->start_pc = extable.start_pc(entry_index); 2599 entry->end_pc = extable.end_pc(entry_index); 2600 entry->handler_pc = extable.handler_pc(entry_index); 2601 entry->catchType = extable.catch_type_index(entry_index); 2602 JVM_END 2603 2604 2605 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2606 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2607 Method* method = ik->methods()->at(method_index); 2608 return method->exception_table_length(); 2609 JVM_END 2610 2611 2612 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2613 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2614 Method* method = ik->methods()->at(method_index); 2615 return method->access_flags().as_method_flags(); 2616 JVM_END 2617 2618 2619 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2620 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2621 return ik->field_access_flags(field_index); 2622 JVM_END 2623 2624 2625 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2626 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2627 Method* method = ik->methods()->at(method_index); 2628 return method->max_locals(); 2629 JVM_END 2630 2631 2632 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2633 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2634 Method* method = ik->methods()->at(method_index); 2635 return method->size_of_parameters(); 2636 JVM_END 2637 2638 2639 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2640 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2641 Method* method = ik->methods()->at(method_index); 2642 return method->verifier_max_stack(); 2643 JVM_END 2644 2645 2646 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2647 ResourceMark rm(THREAD); 2648 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2649 Method* method = ik->methods()->at(method_index); 2650 return method->is_object_constructor(); 2651 JVM_END 2652 2653 2654 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2655 ResourceMark rm(THREAD); 2656 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2657 Method* method = ik->methods()->at(method_index); 2658 return method->is_overpass(); 2659 JVM_END 2660 2661 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2662 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2663 Method* method = ik->methods()->at(method_index); 2664 return method->name()->as_utf8(); 2665 JVM_END 2666 2667 2668 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2669 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2670 Method* method = ik->methods()->at(method_index); 2671 return method->signature()->as_utf8(); 2672 JVM_END 2673 2674 /** 2675 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2676 * read entries in the constant pool. Since the old verifier always 2677 * works on a copy of the code, it will not see any rewriting that 2678 * may possibly occur in the middle of verification. So it is important 2679 * that nothing it calls tries to use the cpCache instead of the raw 2680 * constant pool, so we must use cp->uncached_x methods when appropriate. 2681 */ 2682 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2683 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2684 ConstantPool* cp = ik->constants(); 2685 switch (cp->tag_at(cp_index).value()) { 2686 case JVM_CONSTANT_Fieldref: 2687 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2688 default: 2689 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2690 } 2691 ShouldNotReachHere(); 2692 return nullptr; 2693 JVM_END 2694 2695 2696 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2697 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2698 ConstantPool* cp = ik->constants(); 2699 switch (cp->tag_at(cp_index).value()) { 2700 case JVM_CONSTANT_InterfaceMethodref: 2701 case JVM_CONSTANT_Methodref: 2702 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2703 default: 2704 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2705 } 2706 ShouldNotReachHere(); 2707 return nullptr; 2708 JVM_END 2709 2710 2711 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2712 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2713 ConstantPool* cp = ik->constants(); 2714 switch (cp->tag_at(cp_index).value()) { 2715 case JVM_CONSTANT_InterfaceMethodref: 2716 case JVM_CONSTANT_Methodref: 2717 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2718 default: 2719 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2720 } 2721 ShouldNotReachHere(); 2722 return nullptr; 2723 JVM_END 2724 2725 2726 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2727 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2728 ConstantPool* cp = ik->constants(); 2729 switch (cp->tag_at(cp_index).value()) { 2730 case JVM_CONSTANT_Fieldref: 2731 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2732 default: 2733 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2734 } 2735 ShouldNotReachHere(); 2736 return nullptr; 2737 JVM_END 2738 2739 2740 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2741 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2742 ConstantPool* cp = ik->constants(); 2743 Symbol* classname = cp->klass_name_at(cp_index); 2744 return classname->as_utf8(); 2745 JVM_END 2746 2747 2748 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2749 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2750 ConstantPool* cp = ik->constants(); 2751 switch (cp->tag_at(cp_index).value()) { 2752 case JVM_CONSTANT_Fieldref: { 2753 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2754 Symbol* classname = cp->klass_name_at(class_index); 2755 return classname->as_utf8(); 2756 } 2757 default: 2758 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2759 } 2760 ShouldNotReachHere(); 2761 return nullptr; 2762 JVM_END 2763 2764 2765 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2766 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2767 ConstantPool* cp = ik->constants(); 2768 switch (cp->tag_at(cp_index).value()) { 2769 case JVM_CONSTANT_Methodref: 2770 case JVM_CONSTANT_InterfaceMethodref: { 2771 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2772 Symbol* classname = cp->klass_name_at(class_index); 2773 return classname->as_utf8(); 2774 } 2775 default: 2776 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2777 } 2778 ShouldNotReachHere(); 2779 return nullptr; 2780 JVM_END 2781 2782 2783 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2784 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2785 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread); 2786 ConstantPool* cp = ik->constants(); 2787 ConstantPool* cp_called = ik_called->constants(); 2788 switch (cp->tag_at(cp_index).value()) { 2789 case JVM_CONSTANT_Fieldref: { 2790 Symbol* name = cp->uncached_name_ref_at(cp_index); 2791 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2792 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) { 2793 if (fs.name() == name && fs.signature() == signature) { 2794 return fs.access_flags().as_field_flags(); 2795 } 2796 } 2797 return -1; 2798 } 2799 default: 2800 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2801 } 2802 ShouldNotReachHere(); 2803 return 0; 2804 JVM_END 2805 2806 2807 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2808 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2809 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread); 2810 ConstantPool* cp = ik->constants(); 2811 switch (cp->tag_at(cp_index).value()) { 2812 case JVM_CONSTANT_Methodref: 2813 case JVM_CONSTANT_InterfaceMethodref: { 2814 Symbol* name = cp->uncached_name_ref_at(cp_index); 2815 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2816 Array<Method*>* methods = ik_called->methods(); 2817 int methods_count = methods->length(); 2818 for (int i = 0; i < methods_count; i++) { 2819 Method* method = methods->at(i); 2820 if (method->name() == name && method->signature() == signature) { 2821 return method->access_flags().as_method_flags(); 2822 } 2823 } 2824 return -1; 2825 } 2826 default: 2827 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2828 } 2829 ShouldNotReachHere(); 2830 return 0; 2831 JVM_END 2832 2833 2834 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2835 2836 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2837 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2838 JVM_END 2839 2840 2841 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2842 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2843 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2844 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2845 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2846 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2847 JVM_END 2848 2849 // Printing support ////////////////////////////////////////////////// 2850 extern "C" { 2851 2852 ATTRIBUTE_PRINTF(3, 0) 2853 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2854 // Reject count values that are negative signed values converted to 2855 // unsigned; see bug 4399518, 4417214 2856 if ((intptr_t)count <= 0) return -1; 2857 2858 int result = os::vsnprintf(str, count, fmt, args); 2859 if (result > 0 && (size_t)result >= count) { 2860 result = -1; 2861 } 2862 2863 return result; 2864 } 2865 2866 ATTRIBUTE_PRINTF(3, 4) 2867 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2868 va_list args; 2869 int len; 2870 va_start(args, fmt); 2871 len = jio_vsnprintf(str, count, fmt, args); 2872 va_end(args); 2873 return len; 2874 } 2875 2876 ATTRIBUTE_PRINTF(2, 3) 2877 int jio_fprintf(FILE* f, const char *fmt, ...) { 2878 int len; 2879 va_list args; 2880 va_start(args, fmt); 2881 len = jio_vfprintf(f, fmt, args); 2882 va_end(args); 2883 return len; 2884 } 2885 2886 ATTRIBUTE_PRINTF(2, 0) 2887 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2888 if (Arguments::vfprintf_hook() != nullptr) { 2889 return Arguments::vfprintf_hook()(f, fmt, args); 2890 } else { 2891 return vfprintf(f, fmt, args); 2892 } 2893 } 2894 2895 ATTRIBUTE_PRINTF(1, 2) 2896 JNIEXPORT int jio_printf(const char *fmt, ...) { 2897 int len; 2898 va_list args; 2899 va_start(args, fmt); 2900 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2901 va_end(args); 2902 return len; 2903 } 2904 2905 // HotSpot specific jio method 2906 void jio_print(const char* s, size_t len) { 2907 // Try to make this function as atomic as possible. 2908 if (Arguments::vfprintf_hook() != nullptr) { 2909 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2910 } else { 2911 // Make an unused local variable to avoid warning from gcc compiler. 2912 bool dummy = os::write(defaultStream::output_fd(), s, len); 2913 } 2914 } 2915 2916 } // Extern C 2917 2918 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2919 2920 // In most of the JVM thread support functions we need to access the 2921 // thread through a ThreadsListHandle to prevent it from exiting and 2922 // being reclaimed while we try to operate on it. The exceptions to this 2923 // rule are when operating on the current thread, or if the monitor of 2924 // the target java.lang.Thread is locked at the Java level - in both 2925 // cases the target cannot exit. 2926 2927 static void thread_entry(JavaThread* thread, TRAPS) { 2928 HandleMark hm(THREAD); 2929 Handle obj(THREAD, thread->threadObj()); 2930 JavaValue result(T_VOID); 2931 JavaCalls::call_virtual(&result, 2932 obj, 2933 vmClasses::Thread_klass(), 2934 vmSymbols::run_method_name(), 2935 vmSymbols::void_method_signature(), 2936 THREAD); 2937 } 2938 2939 2940 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2941 #if INCLUDE_CDS 2942 if (CDSConfig::allow_only_single_java_thread()) { 2943 // During java -Xshare:dump, if we allow multiple Java threads to 2944 // execute in parallel, symbols and classes may be loaded in 2945 // random orders which will make the resulting CDS archive 2946 // non-deterministic. 2947 // 2948 // Lucikly, during java -Xshare:dump, it's important to run only 2949 // the code in the main Java thread (which is NOT started here) that 2950 // creates the module graph, etc. It's safe to not start the other 2951 // threads which are launched by class static initializers 2952 // (ReferenceHandler, FinalizerThread and CleanerImpl). 2953 if (log_is_enabled(Info, aot)) { 2954 ResourceMark rm; 2955 oop t = JNIHandles::resolve_non_null(jthread); 2956 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 2957 } 2958 return; 2959 } 2960 #endif 2961 JavaThread *native_thread = nullptr; 2962 2963 // We cannot hold the Threads_lock when we throw an exception, 2964 // due to rank ordering issues. Example: we might need to grab the 2965 // Heap_lock while we construct the exception. 2966 bool throw_illegal_thread_state = false; 2967 2968 // We must release the Threads_lock before we can post a jvmti event 2969 // in Thread::start. 2970 { 2971 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock); 2972 // Ensure that the C++ Thread and OSThread structures aren't freed before 2973 // we operate. 2974 MutexLocker ml(Threads_lock); 2975 2976 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2977 // re-starting an already started thread, so we should usually find 2978 // that the JavaThread is null. However for a JNI attached thread 2979 // there is a small window between the Thread object being created 2980 // (with its JavaThread set) and the update to its threadStatus, so we 2981 // have to check for this 2982 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 2983 throw_illegal_thread_state = true; 2984 } else { 2985 jlong size = 2986 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2987 // Allocate the C++ Thread structure and create the native thread. The 2988 // stack size retrieved from java is 64-bit signed, but the constructor takes 2989 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2990 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2991 // - Avoid passing negative values which would result in really large stacks. 2992 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2993 size_t sz = size > 0 ? (size_t) size : 0; 2994 native_thread = new JavaThread(&thread_entry, sz); 2995 2996 // At this point it may be possible that no osthread was created for the 2997 // JavaThread due to lack of memory. Check for this situation and throw 2998 // an exception if necessary. Eventually we may want to change this so 2999 // that we only grab the lock if the thread was created successfully - 3000 // then we can also do this check and throw the exception in the 3001 // JavaThread constructor. 3002 if (native_thread->osthread() != nullptr) { 3003 // Note: the current thread is not being used within "prepare". 3004 native_thread->prepare(jthread); 3005 } 3006 } 3007 } 3008 3009 if (throw_illegal_thread_state) { 3010 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3011 } 3012 3013 assert(native_thread != nullptr, "Starting null thread?"); 3014 3015 if (native_thread->osthread() == nullptr) { 3016 ResourceMark rm(thread); 3017 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 3018 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 3019 // No one should hold a reference to the 'native_thread'. 3020 native_thread->smr_delete(); 3021 if (JvmtiExport::should_post_resource_exhausted()) { 3022 JvmtiExport::post_resource_exhausted( 3023 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3024 os::native_thread_creation_failed_msg()); 3025 } 3026 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3027 os::native_thread_creation_failed_msg()); 3028 } 3029 3030 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3031 3032 Thread::start(native_thread); 3033 3034 JVM_END 3035 3036 3037 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3038 ThreadsListHandle tlh(thread); 3039 oop java_thread = nullptr; 3040 JavaThread* receiver = nullptr; 3041 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3042 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3043 3044 if (is_alive) { 3045 // jthread refers to a live JavaThread. 3046 Thread::set_priority(receiver, (ThreadPriority)prio); 3047 } 3048 // Implied else: If the JavaThread hasn't started yet, then the 3049 // priority set in the java.lang.Thread object above will be pushed 3050 // down when it does start. 3051 JVM_END 3052 3053 3054 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3055 HOTSPOT_THREAD_YIELD(); 3056 os::naked_yield(); 3057 JVM_END 3058 3059 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos)) 3060 if (nanos < 0) { 3061 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range"); 3062 } 3063 3064 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3065 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3066 } 3067 3068 // Save current thread state and restore it at the end of this block. 3069 // And set new thread state to SLEEPING. 3070 JavaThreadSleepState jtss(thread); 3071 3072 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC); 3073 3074 if (nanos == 0) { 3075 os::naked_yield(); 3076 } else { 3077 ThreadState old_state = thread->osthread()->get_state(); 3078 thread->osthread()->set_state(SLEEPING); 3079 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed 3080 // An asynchronous exception could have been thrown on 3081 // us while we were sleeping. We do not overwrite those. 3082 if (!HAS_PENDING_EXCEPTION) { 3083 HOTSPOT_THREAD_SLEEP_END(1); 3084 if (!thread->has_async_exception_condition()) { 3085 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3086 // to properly restore the thread state. That's likely wrong. 3087 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3088 } 3089 } 3090 } 3091 thread->osthread()->set_state(old_state); 3092 } 3093 HOTSPOT_THREAD_SLEEP_END(0); 3094 JVM_END 3095 3096 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3097 oop jthread = thread->threadObj(); 3098 assert(jthread != nullptr, "no current carrier thread!"); 3099 return JNIHandles::make_local(THREAD, jthread); 3100 JVM_END 3101 3102 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3103 oop theThread = thread->vthread(); 3104 assert(theThread != (oop)nullptr, "no current thread!"); 3105 return JNIHandles::make_local(THREAD, theThread); 3106 JVM_END 3107 3108 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3109 jobject theThread)) 3110 oop threadObj = JNIHandles::resolve(theThread); 3111 thread->set_vthread(threadObj); 3112 3113 // Set _monitor_owner_id of new current Thread 3114 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj)); 3115 3116 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3117 JVM_END 3118 3119 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3120 return ThreadIdentifier::unsafe_offset(); 3121 JVM_END 3122 3123 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3124 ThreadsListHandle tlh(thread); 3125 JavaThread* receiver = nullptr; 3126 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3127 if (is_alive) { 3128 // jthread refers to a live JavaThread. 3129 receiver->interrupt(); 3130 } 3131 JVM_END 3132 3133 // Return true iff the current thread has locked the object passed in 3134 3135 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3136 if (obj == nullptr) { 3137 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3138 } 3139 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3140 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3141 JVM_END 3142 3143 JVM_ENTRY(jobjectArray, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3144 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD); 3145 return (jobjectArray) JNIHandles::make_local(THREAD, trace); 3146 JVM_END 3147 3148 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread)) 3149 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD); 3150 return JNIHandles::make_local(THREAD, snapshot); 3151 JVM_END 3152 3153 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3154 // We don't use a ThreadsListHandle here because the current thread 3155 // must be alive. 3156 oop java_thread = JNIHandles::resolve_non_null(jthread); 3157 JavaThread* thr = java_lang_Thread::thread(java_thread); 3158 if (thread == thr && !thr->has_attached_via_jni()) { 3159 // Thread naming is only supported for the current thread and 3160 // we don't set the name of an attached thread to avoid stepping 3161 // on other programs. 3162 ResourceMark rm(thread); 3163 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3164 os::set_native_thread_name(thread_name); 3165 } 3166 JVM_END 3167 3168 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3169 oop theCache = thread->scopedValueCache(); 3170 return JNIHandles::make_local(THREAD, theCache); 3171 JVM_END 3172 3173 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3174 jobject theCache)) 3175 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3176 thread->set_scopedValueCache(objs); 3177 JVM_END 3178 3179 3180 // java.lang.Package //////////////////////////////////////////////////////////////// 3181 3182 3183 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3184 ResourceMark rm(THREAD); 3185 JvmtiVMObjectAllocEventCollector oam; 3186 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3187 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3188 return (jstring) JNIHandles::make_local(THREAD, result); 3189 JVM_END 3190 3191 3192 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3193 JvmtiVMObjectAllocEventCollector oam; 3194 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3195 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3196 JVM_END 3197 3198 3199 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3200 3201 3202 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3203 MonitorLocker ml(Heap_lock); 3204 oop ref = Universe::reference_pending_list(); 3205 if (ref != nullptr) { 3206 Universe::clear_reference_pending_list(); 3207 } 3208 return JNIHandles::make_local(THREAD, ref); 3209 JVM_END 3210 3211 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3212 MonitorLocker ml(Heap_lock); 3213 return Universe::has_reference_pending_list(); 3214 JVM_END 3215 3216 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3217 MonitorLocker ml(Heap_lock); 3218 while (!Universe::has_reference_pending_list()) { 3219 ml.wait(); 3220 } 3221 JVM_END 3222 3223 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref)) 3224 oop ref_oop = JNIHandles::resolve_non_null(ref); 3225 // PhantomReference has its own implementation of get(). 3226 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3227 oop referent = java_lang_ref_Reference::weak_referent(ref_oop); 3228 return JNIHandles::make_local(THREAD, referent); 3229 JVM_END 3230 3231 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3232 oop ref_oop = JNIHandles::resolve_non_null(ref); 3233 // PhantomReference has its own implementation of refersTo(). 3234 // See: JVM_PhantomReferenceRefersTo 3235 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3236 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3237 return referent == JNIHandles::resolve(o); 3238 JVM_END 3239 3240 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3241 oop ref_oop = JNIHandles::resolve_non_null(ref); 3242 // FinalReference has it's own implementation of clear(). 3243 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3244 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3245 // If the referent has already been cleared then done. 3246 // However, if the referent is dead but has not yet been cleared by 3247 // concurrent reference processing, it should NOT be cleared here. 3248 // Instead, clearing should be left to the GC. Clearing it here could 3249 // detectably lose an expected notification, which is impossible with 3250 // STW reference processing. The clearing in enqueue() doesn't have 3251 // this problem, since the enqueue covers the notification, but it's not 3252 // worth the effort to handle that case specially. 3253 return; 3254 } 3255 java_lang_ref_Reference::clear_referent(ref_oop); 3256 JVM_END 3257 3258 3259 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3260 3261 3262 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3263 oop ref_oop = JNIHandles::resolve_non_null(ref); 3264 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3265 return referent == JNIHandles::resolve(o); 3266 JVM_END 3267 3268 3269 // ObjectInputStream /////////////////////////////////////////////////////////////// 3270 3271 // Return the first user-defined class loader up the execution stack, or null 3272 // if only code from the bootstrap or platform class loader is on the stack. 3273 3274 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3275 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3276 InstanceKlass* ik = vfst.method()->method_holder(); 3277 oop loader = ik->class_loader(); 3278 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3279 return JNIHandles::make_local(THREAD, loader); 3280 } 3281 } 3282 return nullptr; 3283 JVM_END 3284 3285 3286 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3287 3288 3289 // resolve array handle and check arguments 3290 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3291 if (arr == nullptr) { 3292 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3293 } 3294 oop a = JNIHandles::resolve_non_null(arr); 3295 if (!a->is_array()) { 3296 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3297 } else if (type_array_only && !a->is_typeArray()) { 3298 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3299 } 3300 return arrayOop(a); 3301 } 3302 3303 3304 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3305 arrayOop a = check_array(env, arr, false, CHECK_0); 3306 return a->length(); 3307 JVM_END 3308 3309 3310 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3311 JvmtiVMObjectAllocEventCollector oam; 3312 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3313 jvalue value; 3314 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3315 oop box = Reflection::box(&value, type, CHECK_NULL); 3316 return JNIHandles::make_local(THREAD, box); 3317 JVM_END 3318 3319 3320 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3321 jvalue value; 3322 value.i = 0; // to initialize value before getting used in CHECK 3323 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3324 assert(a->is_typeArray(), "just checking"); 3325 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3326 BasicType wide_type = (BasicType) wCode; 3327 if (type != wide_type) { 3328 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3329 } 3330 return value; 3331 JVM_END 3332 3333 3334 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3335 arrayOop a = check_array(env, arr, false, CHECK); 3336 oop box = JNIHandles::resolve(val); 3337 jvalue value; 3338 value.i = 0; // to initialize value before getting used in CHECK 3339 BasicType value_type; 3340 if (a->is_objArray()) { 3341 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3342 value_type = Reflection::unbox_for_regular_object(box, &value); 3343 } else { 3344 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3345 } 3346 Reflection::array_set(&value, a, index, value_type, CHECK); 3347 JVM_END 3348 3349 3350 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3351 arrayOop a = check_array(env, arr, true, CHECK); 3352 assert(a->is_typeArray(), "just checking"); 3353 BasicType value_type = (BasicType) vCode; 3354 Reflection::array_set(&v, a, index, value_type, CHECK); 3355 JVM_END 3356 3357 3358 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3359 JvmtiVMObjectAllocEventCollector oam; 3360 oop element_mirror = JNIHandles::resolve(eltClass); 3361 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3362 return JNIHandles::make_local(THREAD, result); 3363 JVM_END 3364 3365 3366 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3367 JvmtiVMObjectAllocEventCollector oam; 3368 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3369 oop element_mirror = JNIHandles::resolve(eltClass); 3370 assert(dim_array->is_typeArray(), "just checking"); 3371 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3372 return JNIHandles::make_local(THREAD, result); 3373 JVM_END 3374 3375 3376 // Library support /////////////////////////////////////////////////////////////////////////// 3377 3378 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3379 return ZipLibrary::handle(); 3380 JVM_END 3381 3382 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3383 //%note jvm_ct 3384 char ebuf[1024]; 3385 void *load_result; 3386 { 3387 ThreadToNativeFromVM ttnfvm(thread); 3388 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3389 } 3390 if (load_result == nullptr) { 3391 if (throwException) { 3392 char msg[1024]; 3393 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3394 // Since 'ebuf' may contain a string encoded using 3395 // platform encoding scheme, we need to pass 3396 // Exceptions::unsafe_to_utf8 to the new_exception method 3397 // as the last argument. See bug 6367357. 3398 Handle h_exception = 3399 Exceptions::new_exception(thread, 3400 vmSymbols::java_lang_UnsatisfiedLinkError(), 3401 msg, Exceptions::unsafe_to_utf8); 3402 3403 THROW_HANDLE_NULL(h_exception); 3404 } else { 3405 log_info(library)("Failed to load library %s", name); 3406 return load_result; 3407 } 3408 } 3409 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3410 return load_result; 3411 JVM_END 3412 3413 3414 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3415 os::dll_unload(handle); 3416 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3417 JVM_END 3418 3419 3420 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3421 void* find_result = os::dll_lookup(handle, name); 3422 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3423 find_result != nullptr ? "Found" : "Failed to find", 3424 name, p2i(handle)); 3425 return find_result; 3426 JVM_END 3427 3428 3429 // JNI version /////////////////////////////////////////////////////////////////////////////// 3430 3431 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3432 return Threads::is_supported_jni_version_including_1_1(version); 3433 JVM_END 3434 3435 3436 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3437 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3438 JVM_END 3439 3440 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void)) 3441 return Arguments::is_valhalla_enabled() ? JNI_TRUE : JNI_FALSE; 3442 JVM_END 3443 3444 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3445 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3446 JVM_END 3447 3448 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void)) 3449 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE; 3450 JVM_END 3451 3452 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void)) 3453 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE; 3454 JVM_END 3455 3456 // String support /////////////////////////////////////////////////////////////////////////// 3457 3458 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3459 JvmtiVMObjectAllocEventCollector oam; 3460 if (str == nullptr) return nullptr; 3461 oop string = JNIHandles::resolve_non_null(str); 3462 oop result = StringTable::intern(string, CHECK_NULL); 3463 return (jstring) JNIHandles::make_local(THREAD, result); 3464 JVM_END 3465 3466 3467 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3468 3469 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3470 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3471 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3472 // in the safepoint protocol, thread suspension, thread interruption, or most things of that 3473 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has 3474 // shutdown. JavaThreads will be "in native" when using this API from JDK code. 3475 3476 3477 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3478 VM_Exit::block_if_vm_exited(); 3479 return new PlatformMutex(); 3480 } 3481 3482 3483 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3484 VM_Exit::block_if_vm_exited(); 3485 delete ((PlatformMutex*) mon); 3486 } 3487 3488 3489 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3490 VM_Exit::block_if_vm_exited(); 3491 ((PlatformMutex*) mon)->lock(); 3492 return 0; 3493 } 3494 3495 3496 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3497 VM_Exit::block_if_vm_exited(); 3498 ((PlatformMutex*) mon)->unlock(); 3499 } 3500 3501 3502 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3503 3504 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3505 Handle loader, jboolean throwError, TRAPS) { 3506 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL); 3507 3508 // Check if we should initialize the class 3509 if (init && klass->is_instance_klass()) { 3510 klass->initialize(CHECK_NULL); 3511 } 3512 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3513 } 3514 3515 3516 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3517 3518 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3519 Handle method_handle; 3520 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3521 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3522 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3523 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3524 assert(args() == nullptr || !args->is_flatArray(), "args are never flat"); 3525 3526 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3527 jobject res = JNIHandles::make_local(THREAD, result); 3528 if (JvmtiExport::should_post_vm_object_alloc()) { 3529 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3530 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3531 if (java_lang_Class::is_primitive(ret_type)) { 3532 // Only for primitive type vm allocates memory for java object. 3533 // See box() method. 3534 JvmtiExport::post_vm_object_alloc(thread, result); 3535 } 3536 } 3537 return res; 3538 } else { 3539 THROW_NULL(vmSymbols::java_lang_StackOverflowError()); 3540 } 3541 JVM_END 3542 3543 3544 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3545 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3546 assert(args() == nullptr || !args->is_flatArray(), "args are never flat"); 3547 oop constructor_mirror = JNIHandles::resolve(c); 3548 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3549 jobject res = JNIHandles::make_local(THREAD, result); 3550 if (JvmtiExport::should_post_vm_object_alloc()) { 3551 JvmtiExport::post_vm_object_alloc(thread, result); 3552 } 3553 return res; 3554 JVM_END 3555 3556 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3557 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3558 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3559 JVM_END 3560 3561 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3562 jclass caller, 3563 jstring interfaceMethodName, 3564 jobject factoryType, 3565 jobject interfaceMethodType, 3566 jobject implementationMember, 3567 jobject dynamicMethodType, 3568 jclass lambdaProxyClass)) 3569 #if INCLUDE_CDS 3570 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) { 3571 return; 3572 } 3573 3574 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller)); 3575 if (caller_ik->is_hidden()) { 3576 // Hidden classes not of type lambda proxy classes are currently not being archived. 3577 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3578 // registered for archiving. 3579 return; 3580 } 3581 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass)); 3582 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3583 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3584 3585 Symbol* interface_method_name = nullptr; 3586 if (interfaceMethodName != nullptr) { 3587 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3588 } 3589 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3590 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3591 3592 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3593 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3594 3595 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3596 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3597 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3598 3599 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3600 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3601 3602 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3603 interface_method_type, m, dynamic_method_type, THREAD); 3604 #endif // INCLUDE_CDS 3605 JVM_END 3606 3607 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3608 jclass caller, 3609 jstring interfaceMethodName, 3610 jobject factoryType, 3611 jobject interfaceMethodType, 3612 jobject implementationMember, 3613 jobject dynamicMethodType)) 3614 #if INCLUDE_CDS 3615 3616 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3617 implementationMember == nullptr || dynamicMethodType == nullptr) { 3618 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3619 } 3620 3621 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller)); 3622 if (!caller_ik->in_aot_cache()) { 3623 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3624 return nullptr; 3625 } 3626 3627 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3628 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3629 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3630 3631 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3632 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3633 3634 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3635 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3636 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3637 3638 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3639 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3640 3641 InstanceKlass* loaded_lambda = 3642 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3643 interface_method_type, m, dynamic_method_type, 3644 CHECK_(nullptr)); 3645 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3646 #else 3647 return nullptr; 3648 #endif // INCLUDE_CDS 3649 JVM_END 3650 3651 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3652 if (CDSConfig::is_dumping_static_archive()) { 3653 // We do this so that the default CDS archive can be deterministic. 3654 const char* release = VM_Version::vm_release(); 3655 const char* dbg_level = VM_Version::jdk_debug_level(); 3656 const char* version = VM_Version::internal_vm_info_string(); 3657 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3658 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3659 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3660 seed += (jlong)VM_Version::vm_major_version(); 3661 seed += (jlong)VM_Version::vm_minor_version(); 3662 seed += (jlong)VM_Version::vm_security_version(); 3663 seed += (jlong)VM_Version::vm_patch_version(); 3664 if (seed == 0) { // don't let this ever be zero. 3665 seed = 0x87654321; 3666 } 3667 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3668 return seed; 3669 } else { 3670 return 0; 3671 } 3672 JVM_END 3673 3674 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus()) 3675 return CDSConfig::get_status(); 3676 JVM_END 3677 3678 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3679 #if INCLUDE_CDS 3680 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity"); 3681 if (line != nullptr) { 3682 ResourceMark rm(THREAD); 3683 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3684 char* c_line = java_lang_String::as_utf8_string(h_line()); 3685 if (CDSConfig::is_dumping_dynamic_archive()) { 3686 // Note: LambdaFormInvokers::append take same format which is not 3687 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3688 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3689 } 3690 if (ClassListWriter::is_enabled()) { 3691 ClassListWriter w; 3692 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line); 3693 } 3694 } 3695 #endif // INCLUDE_CDS 3696 JVM_END 3697 3698 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3699 #if INCLUDE_CDS 3700 ResourceMark rm(THREAD); 3701 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3702 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3703 AOTMetaspace::dump_loaded_classes(file_name, THREAD); 3704 #endif // INCLUDE_CDS 3705 JVM_END 3706 3707 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3708 #if INCLUDE_CDS 3709 ResourceMark rm(THREAD); 3710 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3711 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3712 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3713 #endif // INCLUDE_CDS 3714 JVM_END 3715 3716 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls)) 3717 #if INCLUDE_CDS 3718 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3719 if (!k->is_instance_klass()) { 3720 return false; 3721 } else { 3722 if (InstanceKlass::cast(k)->is_enum_subclass() || 3723 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) { 3724 // This class will be cached in AOT-initialized state. No need for init barriers. 3725 return false; 3726 } else { 3727 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles 3728 // must emit barriers to ensure class initialization during production run. 3729 ResourceMark rm(THREAD); 3730 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name()); 3731 return true; 3732 } 3733 } 3734 #else 3735 return false; 3736 #endif // INCLUDE_CDS 3737 JVM_END 3738 3739 // Returns an array of all live Thread objects (VM internal JavaThreads, 3740 // jvmti agent threads, and JNI attaching threads are skipped) 3741 // See CR 6404306 regarding JNI attaching threads 3742 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3743 ResourceMark rm(THREAD); 3744 ThreadsListEnumerator tle(THREAD, false, false); 3745 JvmtiVMObjectAllocEventCollector oam; 3746 3747 int num_threads = tle.num_threads(); 3748 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3749 objArrayHandle threads_ah(THREAD, r); 3750 3751 for (int i = 0; i < num_threads; i++) { 3752 Handle h = tle.get_threadObj(i); 3753 threads_ah->obj_at_put(i, h()); 3754 } 3755 3756 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3757 JVM_END 3758 3759 3760 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3761 // Return StackTraceElement[][], each element is the stack trace of a thread in 3762 // the corresponding entry in the given threads array 3763 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3764 JvmtiVMObjectAllocEventCollector oam; 3765 3766 // Check if threads is null 3767 if (threads == nullptr) { 3768 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3769 } 3770 3771 refArrayOop a = oop_cast<refArrayOop>(JNIHandles::resolve_non_null(threads)); 3772 refArrayHandle ah(THREAD, a); 3773 int num_threads = ah->length(); 3774 // check if threads is non-empty array 3775 if (num_threads == 0) { 3776 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3777 } 3778 3779 // check if threads is not an array of objects of Thread class 3780 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3781 if (k != vmClasses::Thread_klass()) { 3782 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3783 } 3784 3785 ResourceMark rm(THREAD); 3786 3787 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3788 for (int i = 0; i < num_threads; i++) { 3789 oop thread_obj = ah->obj_at(i); 3790 instanceHandle h(THREAD, (instanceOop) thread_obj); 3791 thread_handle_array->append(h); 3792 } 3793 3794 // The JavaThread references in thread_handle_array are validated 3795 // in VM_ThreadDump::doit(). 3796 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3797 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3798 3799 JVM_END 3800 3801 // JVM monitoring and management support 3802 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3803 return Management::get_jmm_interface(version); 3804 JVM_END 3805 3806 // com.sun.tools.attach.VirtualMachine agent properties support 3807 // 3808 // Initialize the agent properties with the properties maintained in the VM 3809 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3810 ResourceMark rm; 3811 3812 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3813 3814 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3815 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3816 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3817 return properties; 3818 JVM_END 3819 3820 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3821 { 3822 JvmtiVMObjectAllocEventCollector oam; 3823 3824 if (ofClass == nullptr) { 3825 return nullptr; 3826 } 3827 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3828 // Special handling for primitive objects 3829 if (java_lang_Class::is_primitive(mirror())) { 3830 return nullptr; 3831 } 3832 Klass* k = java_lang_Class::as_Klass(mirror()); 3833 if (!k->is_instance_klass()) { 3834 return nullptr; 3835 } 3836 InstanceKlass* ik = InstanceKlass::cast(k); 3837 int encl_method_class_idx = ik->enclosing_method_class_index(); 3838 if (encl_method_class_idx == 0) { 3839 return nullptr; 3840 } 3841 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3842 objArrayHandle dest(THREAD, dest_o); 3843 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3844 dest->obj_at_put(0, enc_k->java_mirror()); 3845 int encl_method_method_idx = ik->enclosing_method_method_index(); 3846 if (encl_method_method_idx != 0) { 3847 Symbol* sym = ik->constants()->symbol_at( 3848 extract_low_short_from_int( 3849 ik->constants()->name_and_type_at(encl_method_method_idx))); 3850 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3851 dest->obj_at_put(1, str()); 3852 sym = ik->constants()->symbol_at( 3853 extract_high_short_from_int( 3854 ik->constants()->name_and_type_at(encl_method_method_idx))); 3855 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3856 dest->obj_at_put(2, str()); 3857 } 3858 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3859 } 3860 JVM_END 3861 3862 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3863 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3864 ResourceMark rm(THREAD); 3865 3866 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3867 return nullptr; 3868 } 3869 3870 char** vm_flags = Arguments::jvm_flags_array(); 3871 char** vm_args = Arguments::jvm_args_array(); 3872 int num_flags = Arguments::num_jvm_flags(); 3873 int num_args = Arguments::num_jvm_args(); 3874 3875 InstanceKlass* ik = vmClasses::String_klass(); 3876 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3877 objArrayHandle result_h(THREAD, r); 3878 3879 int index = 0; 3880 for (int j = 0; j < num_flags; j++, index++) { 3881 stringStream prefixed; 3882 prefixed.print("-XX:%s", vm_flags[j]); 3883 Handle h = java_lang_String::create_from_platform_dependent_str(prefixed.base(), CHECK_NULL); 3884 result_h->obj_at_put(index, h()); 3885 } 3886 for (int i = 0; i < num_args; i++, index++) { 3887 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3888 result_h->obj_at_put(index, h()); 3889 } 3890 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 3891 JVM_END 3892 3893 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 3894 return os::get_signal_number(name); 3895 JVM_END 3896 3897 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread)) 3898 oop vt = JNIHandles::resolve_external_guard(vthread); 3899 MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/); 3900 JVM_END 3901 3902 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread)) 3903 oop vt = JNIHandles::resolve_external_guard(vthread); 3904 MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/); 3905 JVM_END 3906 3907 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount)) 3908 oop vt = JNIHandles::resolve_external_guard(vthread); 3909 MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/); 3910 JVM_END 3911 3912 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount)) 3913 oop vt = JNIHandles::resolve_external_guard(vthread); 3914 MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/); 3915 JVM_END 3916 3917 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section. 3918 // Needed to avoid deadlocks with JVMTI suspend mechanism. 3919 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter)) 3920 #if INCLUDE_JVMTI 3921 if (!DoJVMTIVirtualThreadTransitions) { 3922 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3923 return; 3924 } 3925 assert(thread->is_disable_suspend() != (bool)enter, 3926 "nested or unbalanced monitor enter/exit is not allowed"); 3927 thread->toggle_is_disable_suspend(); 3928 #endif 3929 JVM_END 3930 3931 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op)) 3932 #if INCLUDE_JFR 3933 freeze_result result = THREAD->last_freeze_fail_result(); 3934 assert(result != freeze_ok, "sanity check"); 3935 EventVirtualThreadPinned event(UNTIMED); 3936 event.set_starttime(THREAD->last_freeze_fail_time()); 3937 if (event.should_commit()) { 3938 ResourceMark rm(THREAD); 3939 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op)); 3940 THREAD->post_vthread_pinned_event(&event, str, result); 3941 } 3942 #endif 3943 JVM_END 3944 3945 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored)) 3946 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent(); 3947 assert(parkEvent != nullptr, "not initialized"); 3948 3949 OopHandle& list_head = ObjectMonitor::vthread_list_head(); 3950 oop vthread_head = nullptr; 3951 while (true) { 3952 if (list_head.peek() != nullptr) { 3953 for (;;) { 3954 oop head = list_head.resolve(); 3955 if (list_head.cmpxchg(head, nullptr) == head) { 3956 return JNIHandles::make_local(THREAD, head); 3957 } 3958 } 3959 } 3960 ThreadBlockInVM tbivm(THREAD); 3961 parkEvent->park(); 3962 } 3963 JVM_END 3964 3965 /* 3966 * Return the current class's class file version. The low order 16 bits of the 3967 * returned jint contain the class's major version. The high order 16 bits 3968 * contain the class's minor version. 3969 */ 3970 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 3971 oop mirror = JNIHandles::resolve_non_null(current); 3972 if (java_lang_Class::is_primitive(mirror)) { 3973 // return latest major version and minor version of 0. 3974 return JVM_CLASSFILE_MAJOR_VERSION; 3975 } 3976 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 3977 return (ik->minor_version() << 16) | ik->major_version(); 3978 JVM_END 3979 3980 /* 3981 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 3982 * get the value will see a materialized value and not a scalar-replaced 3983 * null value. 3984 */ 3985 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 3986 JVM_EnsureMaterializedForStackWalk(env, value); 3987 JVM_END 3988 3989 /* 3990 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded. 3991 */ 3992 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void)) 3993 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE; 3994 JVM_END --- EOF ---