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 = oopFactory::new_flatArray(fak, 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 if (HAS_PENDING_EXCEPTION) { 835 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) { 836 Handle e(THREAD, PENDING_EXCEPTION); 837 CLEAR_PENDING_EXCEPTION; 838 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false); 839 } 840 } 841 const intptr_t identity_hash = result.get_jint(); 842 843 // We now have to set the hash via CAS. It's possible that this will race 844 // other threads. By our invariant of immutability, when there is a 845 // race, the identity hash code is going to be one of the following: 846 // a) 0, another thread updated other markWord bits; b) identity_hash set 847 // by another thread; or c) identity_hash set by the current thread. 848 // A nonzero identity hash code that is not the identity_hash computed 849 // earlier indicates a violation of the invariant. 850 markWord current_mark, old_mark, new_mark; 851 do { 852 current_mark = ho->mark(); 853 new_mark = current_mark.copy_set_hash(identity_hash); 854 old_mark = ho->cas_set_mark(new_mark, current_mark); 855 assert(old_mark.has_no_hash() || old_mark.hash() == new_mark.hash(), 856 "CAS identity hash invariant violated, expected=" INTPTR_FORMAT " actual=" INTPTR_FORMAT, 857 new_mark.hash(), 858 old_mark.hash()); 859 } while (old_mark != current_mark); 860 861 return checked_cast<jint>(new_mark.hash()); 862 } else { 863 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj)); 864 } 865 JVM_END 866 867 868 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 869 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 870 ObjectSynchronizer::wait(obj, ms, CHECK); 871 JVM_END 872 873 874 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 875 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 876 ObjectSynchronizer::notify(obj, CHECK); 877 JVM_END 878 879 880 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 881 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 882 ObjectSynchronizer::notifyall(obj, CHECK); 883 JVM_END 884 885 886 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 887 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 888 Klass* klass = obj->klass(); 889 JvmtiVMObjectAllocEventCollector oam; 890 891 #ifdef ASSERT 892 // Just checking that the cloneable flag is set correct 893 if (obj->is_array()) { 894 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 895 } else { 896 guarantee(obj->is_instance(), "should be instanceOop"); 897 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 898 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 899 } 900 #endif 901 902 // Check if class of obj supports the Cloneable interface. 903 // All arrays are considered to be cloneable (See JLS 20.1.5). 904 // All j.l.r.Reference classes are considered non-cloneable. 905 if (!klass->is_cloneable() || 906 (klass->is_instance_klass() && 907 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 908 ResourceMark rm(THREAD); 909 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 910 } 911 912 if (klass->is_inline_klass()) { 913 // Value instances have no identity, so return the current instance instead of allocating a new one 914 // Value classes cannot have finalizers, so the method can return immediately 915 return JNIHandles::make_local(THREAD, obj()); 916 } 917 918 // Make shallow object copy 919 const size_t size = obj->size(); 920 oop new_obj_oop = nullptr; 921 if (obj->is_array()) { 922 const int length = ((arrayOop)obj())->length(); 923 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 924 /* do_zero */ true, CHECK_NULL); 925 } else { 926 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 927 } 928 929 HeapAccess<>::clone(obj(), new_obj_oop, size); 930 931 Handle new_obj(THREAD, new_obj_oop); 932 // Caution: this involves a java upcall, so the clone should be 933 // "gc-robust" by this stage. 934 if (klass->has_finalizer()) { 935 assert(obj->is_instance(), "should be instanceOop"); 936 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 937 new_obj = Handle(THREAD, new_obj_oop); 938 } 939 940 return JNIHandles::make_local(THREAD, new_obj()); 941 JVM_END 942 943 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 944 945 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 946 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 947 JVM_END 948 949 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 950 return InstanceKlass::is_finalization_enabled(); 951 JVM_END 952 953 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 954 955 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 956 CONT_RegisterNativeMethods(env, cls); 957 JVM_END 958 959 // java.io.File /////////////////////////////////////////////////////////////// 960 961 JVM_LEAF(char*, JVM_NativePath(char* path)) 962 return os::native_path(path); 963 JVM_END 964 965 966 // Misc. class handling /////////////////////////////////////////////////////////// 967 968 969 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 970 // Getting the class of the caller frame. 971 // 972 // The call stack at this point looks something like this: 973 // 974 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ] 975 // [1] [ @CallerSensitive API.method ] 976 // [.] [ (skipped intermediate frames) ] 977 // [n] [ caller ] 978 vframeStream vfst(thread); 979 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 980 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 981 Method* m = vfst.method(); 982 assert(m != nullptr, "sanity"); 983 switch (n) { 984 case 0: 985 // This must only be called from Reflection.getCallerClass 986 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 987 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 988 } 989 // fall-through 990 case 1: 991 // Frame 0 and 1 must be caller sensitive. 992 if (!m->caller_sensitive()) { 993 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 994 } 995 break; 996 default: 997 if (!m->is_ignored_by_security_stack_walk()) { 998 // We have reached the desired frame; return the holder class. 999 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 1000 } 1001 break; 1002 } 1003 } 1004 return nullptr; 1005 JVM_END 1006 1007 1008 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 1009 oop mirror = nullptr; 1010 BasicType t = name2type(utf); 1011 if (t != T_ILLEGAL && !is_reference_type(t)) { 1012 mirror = Universe::java_mirror(t); 1013 } 1014 if (mirror == nullptr) { 1015 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 1016 } else { 1017 return (jclass) JNIHandles::make_local(THREAD, mirror); 1018 } 1019 JVM_END 1020 1021 1022 // Returns a class loaded by the bootstrap class loader; or null 1023 // if not found. ClassNotFoundException is not thrown. 1024 // FindClassFromBootLoader is exported to the launcher for windows. 1025 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 1026 const char* name)) 1027 // Java libraries should ensure that name is never null or illegal. 1028 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 1029 // It's impossible to create this class; the name cannot fit 1030 // into the constant pool. 1031 return nullptr; 1032 } 1033 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name"); 1034 1035 TempNewSymbol h_name = SymbolTable::new_symbol(name); 1036 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 1037 if (k == nullptr) { 1038 return nullptr; 1039 } 1040 1041 if (log_is_enabled(Debug, class, resolve)) { 1042 trace_class_resolution(k); 1043 } 1044 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1045 JVM_END 1046 1047 // Find a class with this name in this loader. 1048 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name, 1049 jboolean init, jobject loader)) 1050 TempNewSymbol h_name = 1051 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 1052 CHECK_NULL); 1053 1054 oop loader_oop = JNIHandles::resolve(loader); 1055 Handle h_loader(THREAD, loader_oop); 1056 1057 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 1058 false, THREAD); 1059 1060 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1061 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 1062 } 1063 return result; 1064 JVM_END 1065 1066 // Currently only called from the old verifier. 1067 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 1068 jboolean init, jclass from)) 1069 TempNewSymbol h_name = 1070 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 1071 CHECK_NULL); 1072 oop from_class_oop = JNIHandles::resolve(from); 1073 assert(from_class_oop != nullptr, "must be"); 1074 Klass* from_class = java_lang_Class::as_Klass(from_class_oop); 1075 assert(from_class != nullptr, "must be"); 1076 oop class_loader = from_class->class_loader(); 1077 1078 Handle h_loader(THREAD, class_loader); 1079 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread); 1080 1081 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1082 // this function is generally only used for class loading during verification. 1083 ResourceMark rm; 1084 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name(); 1085 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name(); 1086 log_debug(class, resolve)("%s %s (verification)", from_name, to_name); 1087 } 1088 1089 #if INCLUDE_CDS 1090 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) { 1091 InstanceKlass* ik = InstanceKlass::cast(from_class); 1092 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name); 1093 } 1094 #endif 1095 1096 return result; 1097 JVM_END 1098 1099 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 1100 static jclass jvm_define_class_common(const char *name, 1101 jobject loader, const jbyte *buf, 1102 jsize len, jobject pd, const char *source, 1103 TRAPS) { 1104 if (source == nullptr) source = "__JVM_DefineClass__"; 1105 1106 JavaThread* jt = THREAD; 1107 1108 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 1109 ClassLoader::perf_define_appclass_selftime(), 1110 ClassLoader::perf_define_appclasses(), 1111 jt->get_thread_stat()->perf_recursion_counts_addr(), 1112 jt->get_thread_stat()->perf_timers_addr(), 1113 PerfClassTraceTime::DEFINE_CLASS); 1114 1115 if (UsePerfData) { 1116 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 1117 } 1118 1119 // Class resolution will get the class name from the .class stream if the name is null. 1120 TempNewSymbol class_name = name == nullptr ? nullptr : 1121 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1122 CHECK_NULL); 1123 1124 ResourceMark rm(THREAD); 1125 ClassFileStream st((u1*)buf, len, source); 1126 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 1127 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1128 ClassLoadInfo cl_info(protection_domain); 1129 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 1130 class_loader, 1131 cl_info, 1132 CHECK_NULL); 1133 1134 if (log_is_enabled(Debug, class, resolve)) { 1135 trace_class_resolution(k); 1136 } 1137 1138 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1139 } 1140 1141 enum { 1142 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 1143 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 1144 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 1145 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 1146 }; 1147 1148 /* 1149 * Define a class with the specified flags that indicates if it's a nestmate, 1150 * hidden, or strongly referenced from class loader. 1151 */ 1152 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 1153 const jbyte *buf, jsize len, jobject pd, 1154 jboolean init, int flags, jobject classData, TRAPS) { 1155 ResourceMark rm(THREAD); 1156 1157 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup)); 1158 // Lookup class must not be a primitive class (whose mirror has a null Klass*) 1159 if (lookup_k == nullptr) { 1160 // The error message is wrong. We come here only if lookup is a primitive class 1161 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1162 } 1163 1164 Handle class_loader (THREAD, lookup_k->class_loader()); 1165 1166 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 1167 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1168 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1169 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1170 1171 InstanceKlass* host_class = nullptr; 1172 if (is_nestmate) { 1173 host_class = lookup_k->nest_host(CHECK_NULL); 1174 } 1175 1176 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1177 name, 1178 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1179 is_nestmate ? host_class->external_name() : "", 1180 is_hidden ? "hidden" : "not hidden", 1181 is_strong ? "strong" : "weak", 1182 vm_annotations ? "with vm annotations" : "without vm annotation"); 1183 1184 if (!is_hidden) { 1185 // classData is only applicable for hidden classes 1186 if (classData != nullptr) { 1187 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1188 } 1189 if (is_nestmate) { 1190 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1191 } 1192 if (!is_strong) { 1193 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1194 } 1195 if (vm_annotations) { 1196 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1197 } 1198 if (flags != STRONG_LOADER_LINK) { 1199 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1200 err_msg("invalid flag 0x%x", flags)); 1201 } 1202 } 1203 1204 // Class resolution will get the class name from the .class stream if the name is null. 1205 TempNewSymbol class_name = name == nullptr ? nullptr : 1206 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1207 CHECK_NULL); 1208 1209 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1210 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1211 ClassFileStream st((u1*)buf, len, source); 1212 1213 InstanceKlass* ik = nullptr; 1214 if (!is_hidden) { 1215 ClassLoadInfo cl_info(protection_domain); 1216 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1217 class_loader, 1218 cl_info, 1219 CHECK_NULL); 1220 1221 if (log_is_enabled(Debug, class, resolve)) { 1222 trace_class_resolution(ik); 1223 } 1224 } else { // hidden 1225 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1226 ClassLoadInfo cl_info(protection_domain, 1227 host_class, 1228 classData_h, 1229 is_hidden, 1230 is_strong, 1231 vm_annotations); 1232 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1233 class_loader, 1234 cl_info, 1235 CHECK_NULL); 1236 1237 // The hidden class loader data has been artificially been kept alive to 1238 // this point. The mirror and any instances of this class have to keep 1239 // it alive afterwards. 1240 ik->class_loader_data()->dec_keep_alive_ref_count(); 1241 1242 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1243 ModuleEntry* module = ik->module(); 1244 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1245 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1246 module_name, 1247 ik->external_name(), 1248 host_class->external_name(), 1249 ik->is_hidden() ? "is hidden" : "is not hidden"); 1250 } 1251 } 1252 1253 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) { 1254 // non-hidden class or nestmate class must be in the same package as the Lookup class 1255 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages"); 1256 } 1257 1258 if (init) { 1259 ik->initialize(CHECK_NULL); 1260 } else { 1261 ik->link_class(CHECK_NULL); 1262 } 1263 1264 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1265 } 1266 1267 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1268 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1269 JVM_END 1270 1271 /* 1272 * Define a class with the specified lookup class. 1273 * lookup: Lookup class 1274 * name: the name of the class 1275 * buf: class bytes 1276 * len: length of class bytes 1277 * pd: protection domain 1278 * init: initialize the class 1279 * flags: properties of the class 1280 * classData: private static pre-initialized field 1281 */ 1282 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1283 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1284 1285 if (lookup == nullptr) { 1286 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1287 } 1288 1289 assert(buf != nullptr, "buf must not be null"); 1290 1291 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1292 JVM_END 1293 1294 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1295 1296 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1297 JVM_END 1298 1299 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1300 ResourceMark rm(THREAD); 1301 1302 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1303 char* str = java_lang_String::as_utf8_string(h_name()); 1304 1305 // Sanity check, don't expect null 1306 if (str == nullptr) return nullptr; 1307 1308 // Internalize the string, converting '.' to '/' in string. 1309 char* p = (char*)str; 1310 while (*p != '\0') { 1311 if (*p == '.') { 1312 *p = '/'; 1313 } 1314 p++; 1315 } 1316 1317 const int str_len = (int)(p - str); 1318 if (str_len > Symbol::max_length()) { 1319 // It's impossible to create this class; the name cannot fit 1320 // into the constant pool. 1321 return nullptr; 1322 } 1323 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1324 1325 // Security Note: 1326 // The Java level wrapper will perform the necessary security check allowing 1327 // us to pass the null as the initiating class loader. 1328 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1329 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader); 1330 #if INCLUDE_CDS 1331 if (k == nullptr) { 1332 // If the class is not already loaded, try to see if it's in the shared 1333 // archive for the current classloader (h_loader). 1334 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1335 } 1336 #endif 1337 return (k == nullptr) ? nullptr : 1338 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1339 JVM_END 1340 1341 // Module support ////////////////////////////////////////////////////////////////////////////// 1342 1343 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1344 jstring location, jobjectArray packages)) 1345 Handle h_module (THREAD, JNIHandles::resolve(module)); 1346 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1347 JVM_END 1348 1349 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1350 Handle h_module (THREAD, JNIHandles::resolve(module)); 1351 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1352 JVM_END 1353 1354 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1355 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1356 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1357 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1358 JVM_END 1359 1360 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1361 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1362 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1363 JVM_END 1364 1365 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1366 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1367 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1368 JVM_END 1369 1370 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1371 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1372 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1373 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1374 JVM_END 1375 1376 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1377 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1378 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1379 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1380 JVM_END 1381 1382 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1383 1384 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1385 assert (cls != nullptr, "illegal class"); 1386 JvmtiVMObjectAllocEventCollector oam; 1387 ResourceMark rm(THREAD); 1388 HandleMark hm(THREAD); 1389 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1390 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1391 return (jstring) JNIHandles::make_local(THREAD, result); 1392 JVM_END 1393 1394 1395 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1396 JvmtiVMObjectAllocEventCollector oam; 1397 oop mirror = JNIHandles::resolve_non_null(cls); 1398 1399 // Special handling for primitive objects 1400 if (java_lang_Class::is_primitive(mirror)) { 1401 // Primitive objects does not have any interfaces 1402 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1403 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1404 } 1405 1406 Klass* klass = java_lang_Class::as_Klass(mirror); 1407 // Figure size of result array 1408 int size; 1409 if (klass->is_instance_klass()) { 1410 InstanceKlass* ik = InstanceKlass::cast(klass); 1411 size = ik->local_interfaces()->length(); 1412 } else { 1413 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1414 size = 2; 1415 } 1416 1417 // Allocate result array 1418 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1419 objArrayHandle result (THREAD, r); 1420 // Fill in result 1421 if (klass->is_instance_klass()) { 1422 // Regular instance klass, fill in all local interfaces 1423 for (int index = 0; index < size; index++) { 1424 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1425 result->obj_at_put(index, k->java_mirror()); 1426 } 1427 } else { 1428 // All arrays implement java.lang.Cloneable and java.io.Serializable 1429 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1430 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1431 } 1432 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1433 JVM_END 1434 1435 1436 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1437 oop mirror = JNIHandles::resolve_non_null(cls); 1438 if (java_lang_Class::is_primitive(mirror)) { 1439 return JNI_FALSE; 1440 } 1441 Klass* k = java_lang_Class::as_Klass(mirror); 1442 return k->is_hidden(); 1443 JVM_END 1444 1445 1446 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1447 ResourceMark rm(THREAD); 1448 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1449 JvmtiVMObjectAllocEventCollector oam; 1450 1451 // Iterate through Java frames 1452 vframeStream vfst(thread); 1453 for(; !vfst.at_end(); vfst.next()) { 1454 int loc = -1; 1455 // get method of frame 1456 Method* method = vfst.method(); 1457 1458 Symbol *name = method->name(); 1459 1460 InstanceKlass* holder = method->method_holder(); 1461 if (name == vmSymbols::runWith_method_name()) { 1462 if (holder == vmClasses::Thread_klass() 1463 || holder == vmClasses::ScopedValue_Carrier_klass()) { 1464 loc = 1; 1465 } 1466 } 1467 1468 if (loc != -1) { 1469 javaVFrame *frame = vfst.asJavaVFrame(); 1470 StackValueCollection* locals = frame->locals(); 1471 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot 1472 Handle result = head_sv->get_obj(); 1473 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1474 if (result() != nullptr) { 1475 return JNIHandles::make_local(THREAD, result()); 1476 } 1477 } 1478 } 1479 1480 return nullptr; 1481 JVM_END 1482 1483 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1484 JvmtiVMObjectAllocEventCollector oam; 1485 // ofClass is a reference to a java_lang_Class object. The mirror object 1486 // of an InstanceKlass 1487 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1488 if (java_lang_Class::is_primitive(ofMirror) || 1489 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1490 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1491 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1492 } 1493 1494 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1495 InnerClassesIterator iter(k); 1496 1497 if (iter.length() == 0) { 1498 // Neither an inner nor outer class 1499 oop result = oopFactory::new_refArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1500 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1501 } 1502 1503 // find inner class info 1504 constantPoolHandle cp(thread, k->constants()); 1505 int length = iter.length(); 1506 1507 // Allocate temp. result array 1508 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length / 4, CHECK_NULL); 1509 refArrayHandle result(THREAD, r); 1510 int members = 0; 1511 1512 for (; !iter.done(); iter.next()) { 1513 int ioff = iter.inner_class_info_index(); 1514 int ooff = iter.outer_class_info_index(); 1515 1516 if (ioff != 0 && ooff != 0) { 1517 // Check to see if the name matches the class we're looking for 1518 // before attempting to find the class. 1519 if (cp->klass_name_at_matches(k, ooff)) { 1520 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1521 if (outer_klass == k) { 1522 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1523 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1524 1525 // Throws an exception if outer klass has not declared k as 1526 // an inner klass 1527 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1528 1529 result->obj_at_put(members, inner_klass->java_mirror()); 1530 members++; 1531 } 1532 } 1533 } 1534 } 1535 1536 if (members != length) { 1537 // Return array of right length 1538 refArrayOop res = oopFactory::new_refArray(vmClasses::Class_klass(), members, CHECK_NULL); 1539 for(int i = 0; i < members; i++) { 1540 res->obj_at_put(i, result->obj_at(i)); 1541 } 1542 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1543 } 1544 1545 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1546 JVM_END 1547 1548 1549 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1550 { 1551 // ofClass is a reference to a java_lang_Class object. 1552 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1553 if (java_lang_Class::is_primitive(ofMirror)) { 1554 return nullptr; 1555 } 1556 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1557 if (!klass->is_instance_klass()) { 1558 return nullptr; 1559 } 1560 1561 bool inner_is_member = false; 1562 Klass* outer_klass 1563 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1564 if (outer_klass == nullptr) return nullptr; // already a top-level class 1565 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1566 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1567 } 1568 JVM_END 1569 1570 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1571 { 1572 oop mirror = JNIHandles::resolve_non_null(cls); 1573 if (java_lang_Class::is_primitive(mirror)) { 1574 return nullptr; 1575 } 1576 Klass* klass = java_lang_Class::as_Klass(mirror); 1577 if (!klass->is_instance_klass()) { 1578 return nullptr; 1579 } 1580 InstanceKlass* k = InstanceKlass::cast(klass); 1581 int ooff = 0, noff = 0; 1582 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1583 if (noff != 0) { 1584 constantPoolHandle i_cp(thread, k->constants()); 1585 Symbol* name = i_cp->symbol_at(noff); 1586 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1587 return (jstring) JNIHandles::make_local(THREAD, str()); 1588 } 1589 } 1590 return nullptr; 1591 } 1592 JVM_END 1593 1594 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1595 assert (cls != nullptr, "illegal class"); 1596 JvmtiVMObjectAllocEventCollector oam; 1597 ResourceMark rm(THREAD); 1598 oop mirror = JNIHandles::resolve_non_null(cls); 1599 // Return null for arrays and primitives 1600 if (!java_lang_Class::is_primitive(mirror)) { 1601 Klass* k = java_lang_Class::as_Klass(mirror); 1602 if (k->is_instance_klass()) { 1603 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1604 if (sym == nullptr) return nullptr; 1605 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1606 return (jstring) JNIHandles::make_local(THREAD, str()); 1607 } 1608 } 1609 return nullptr; 1610 JVM_END 1611 1612 1613 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1614 assert (cls != nullptr, "illegal class"); 1615 oop mirror = JNIHandles::resolve_non_null(cls); 1616 // Return null for arrays and primitives 1617 if (!java_lang_Class::is_primitive(mirror)) { 1618 Klass* k = java_lang_Class::as_Klass(mirror); 1619 if (k->is_instance_klass()) { 1620 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1621 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1622 } 1623 } 1624 return nullptr; 1625 JVM_END 1626 1627 1628 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1629 // some of this code was adapted from from jni_FromReflectedField 1630 1631 oop reflected = JNIHandles::resolve_non_null(field); 1632 oop mirror = java_lang_reflect_Field::clazz(reflected); 1633 int slot = java_lang_reflect_Field::slot(reflected); 1634 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1635 1636 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 1637 int offset = ik->field_offset(slot); 1638 1639 if (modifiers & JVM_ACC_STATIC) { 1640 // for static fields we only look in the current class 1641 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1642 assert(false, "cannot find static field"); 1643 return false; 1644 } 1645 } else { 1646 // for instance fields we start with the current class and work 1647 // our way up through the superclass chain 1648 if (!ik->find_field_from_offset(offset, false, &fd)) { 1649 assert(false, "cannot find instance field"); 1650 return false; 1651 } 1652 } 1653 return true; 1654 } 1655 1656 static Method* jvm_get_method_common(jobject method) { 1657 // some of this code was adapted from from jni_FromReflectedMethod 1658 1659 oop reflected = JNIHandles::resolve_non_null(method); 1660 oop mirror = nullptr; 1661 int slot = 0; 1662 1663 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1664 mirror = java_lang_reflect_Constructor::clazz(reflected); 1665 slot = java_lang_reflect_Constructor::slot(reflected); 1666 } else { 1667 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1668 "wrong type"); 1669 mirror = java_lang_reflect_Method::clazz(reflected); 1670 slot = java_lang_reflect_Method::slot(reflected); 1671 } 1672 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 1673 1674 Method* m = ik->method_with_idnum(slot); 1675 assert(m != nullptr, "cannot find method"); 1676 return m; // caller has to deal with null in product mode 1677 } 1678 1679 /* Type use annotations support (JDK 1.8) */ 1680 1681 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1682 assert (cls != nullptr, "illegal class"); 1683 ResourceMark rm(THREAD); 1684 // Return null for arrays and primitives 1685 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1686 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1687 if (k->is_instance_klass()) { 1688 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1689 if (type_annotations != nullptr) { 1690 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1691 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1692 } 1693 } 1694 } 1695 return nullptr; 1696 JVM_END 1697 1698 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1699 assert (method != nullptr, "illegal method"); 1700 // method is a handle to a java.lang.reflect.Method object 1701 Method* m = jvm_get_method_common(method); 1702 if (m == nullptr) { 1703 return nullptr; 1704 } 1705 1706 AnnotationArray* type_annotations = m->type_annotations(); 1707 if (type_annotations != nullptr) { 1708 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1709 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1710 } 1711 1712 return nullptr; 1713 JVM_END 1714 1715 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1716 assert (field != nullptr, "illegal field"); 1717 fieldDescriptor fd; 1718 bool gotFd = jvm_get_field_common(field, fd); 1719 if (!gotFd) { 1720 return nullptr; 1721 } 1722 1723 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1724 JVM_END 1725 1726 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1727 if (!cp->is_within_bounds(index)) { 1728 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1729 } 1730 } 1731 1732 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1733 { 1734 // method is a handle to a java.lang.reflect.Method object 1735 Method* method_ptr = jvm_get_method_common(method); 1736 methodHandle mh (THREAD, method_ptr); 1737 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1738 const int num_params = mh->method_parameters_length(); 1739 1740 if (num_params < 0) { 1741 // A -1 return value from method_parameters_length means there is no 1742 // parameter data. Return null to indicate this to the reflection 1743 // API. 1744 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1745 return (jobjectArray)nullptr; 1746 } else { 1747 // Otherwise, we return something up to reflection, even if it is 1748 // a zero-length array. Why? Because in some cases this can 1749 // trigger a MalformedParametersException. 1750 1751 // make sure all the symbols are properly formatted 1752 for (int i = 0; i < num_params; i++) { 1753 MethodParametersElement* params = mh->method_parameters_start(); 1754 int index = params[i].name_cp_index; 1755 constantPoolHandle cp(THREAD, mh->constants()); 1756 bounds_check(cp, index, CHECK_NULL); 1757 1758 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1759 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1760 "Wrong type at constant pool index"); 1761 } 1762 1763 } 1764 1765 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1766 objArrayHandle result (THREAD, result_oop); 1767 1768 for (int i = 0; i < num_params; i++) { 1769 MethodParametersElement* params = mh->method_parameters_start(); 1770 // For a 0 index, give a null symbol 1771 Symbol* sym = 0 != params[i].name_cp_index ? 1772 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1773 int flags = params[i].flags; 1774 oop param = Reflection::new_parameter(reflected_method, i, sym, 1775 flags, CHECK_NULL); 1776 result->obj_at_put(i, param); 1777 } 1778 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1779 } 1780 } 1781 JVM_END 1782 1783 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1784 1785 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1786 { 1787 JvmtiVMObjectAllocEventCollector oam; 1788 1789 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1790 // Exclude primitive types and array types 1791 if (java_lang_Class::is_primitive(ofMirror) || 1792 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1793 // Return empty array 1794 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1795 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1796 } 1797 1798 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1799 constantPoolHandle cp(THREAD, k->constants()); 1800 1801 // Ensure class is linked 1802 k->link_class(CHECK_NULL); 1803 1804 // Allocate result 1805 int num_fields; 1806 1807 if (publicOnly) { 1808 num_fields = 0; 1809 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1810 if (fs.access_flags().is_public()) ++num_fields; 1811 } 1812 } else { 1813 num_fields = k->java_fields_count(); 1814 } 1815 1816 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1817 objArrayHandle result (THREAD, r); 1818 1819 int out_idx = 0; 1820 fieldDescriptor fd; 1821 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1822 if (!publicOnly || fs.access_flags().is_public()) { 1823 fd.reinitialize(k, fs.to_FieldInfo()); 1824 oop field = Reflection::new_field(&fd, CHECK_NULL); 1825 result->obj_at_put(out_idx, field); 1826 ++out_idx; 1827 } 1828 } 1829 assert(out_idx == num_fields, "just checking"); 1830 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1831 } 1832 JVM_END 1833 1834 // A class is a record if and only if it is final and a direct subclass of 1835 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1836 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1837 { 1838 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1839 if (k != nullptr && k->is_instance_klass()) { 1840 InstanceKlass* ik = InstanceKlass::cast(k); 1841 return ik->is_record(); 1842 } else { 1843 return false; 1844 } 1845 } 1846 JVM_END 1847 1848 // Returns an array containing the components of the Record attribute, 1849 // or null if the attribute is not present. 1850 // 1851 // Note that this function returns the components of the Record attribute 1852 // even if the class is not a record. 1853 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1854 { 1855 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass)); 1856 1857 Array<RecordComponent*>* components = ik->record_components(); 1858 if (components != nullptr) { 1859 JvmtiVMObjectAllocEventCollector oam; 1860 constantPoolHandle cp(THREAD, ik->constants()); 1861 int length = components->length(); 1862 assert(length >= 0, "unexpected record_components length"); 1863 objArrayOop record_components = 1864 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1865 objArrayHandle components_h (THREAD, record_components); 1866 1867 for (int x = 0; x < length; x++) { 1868 RecordComponent* component = components->at(x); 1869 assert(component != nullptr, "unexpected null record component"); 1870 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1871 components_h->obj_at_put(x, component_oop); 1872 } 1873 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1874 } 1875 1876 return nullptr; 1877 } 1878 JVM_END 1879 1880 static jobjectArray get_class_declared_methods_helper( 1881 JNIEnv *env, 1882 jclass ofClass, jboolean publicOnly, 1883 bool want_constructor, 1884 Klass* klass, TRAPS) { 1885 1886 JvmtiVMObjectAllocEventCollector oam; 1887 1888 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1889 // Exclude primitive types and array types 1890 if (java_lang_Class::is_primitive(ofMirror) 1891 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1892 // Return empty array 1893 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1894 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1895 } 1896 1897 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1898 1899 // Ensure class is linked 1900 k->link_class(CHECK_NULL); 1901 1902 Array<Method*>* methods = k->methods(); 1903 int methods_length = methods->length(); 1904 1905 // Save original method_idnum in case of redefinition, which can change 1906 // the idnum of obsolete methods. The new method will have the same idnum 1907 // but if we refresh the methods array, the counts will be wrong. 1908 ResourceMark rm(THREAD); 1909 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1910 int num_methods = 0; 1911 1912 // Select methods matching the criteria. 1913 for (int i = 0; i < methods_length; i++) { 1914 Method* method = methods->at(i); 1915 if (want_constructor && !method->is_object_constructor()) { 1916 continue; 1917 } 1918 if (!want_constructor && 1919 (method->is_object_constructor() || method->is_class_initializer() || 1920 method->is_overpass())) { 1921 continue; 1922 } 1923 if (publicOnly && !method->is_public()) { 1924 continue; 1925 } 1926 idnums->push(method->method_idnum()); 1927 ++num_methods; 1928 } 1929 1930 // Allocate result 1931 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1932 objArrayHandle result (THREAD, r); 1933 1934 // Now just put the methods that we selected above, but go by their idnum 1935 // in case of redefinition. The methods can be redefined at any safepoint, 1936 // so above when allocating the oop array and below when creating reflect 1937 // objects. 1938 for (int i = 0; i < num_methods; i++) { 1939 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1940 if (method.is_null()) { 1941 // Method may have been deleted and seems this API can handle null 1942 // Otherwise should probably put a method that throws NSME 1943 result->obj_at_put(i, nullptr); 1944 } else { 1945 oop m; 1946 if (want_constructor) { 1947 assert(method->is_object_constructor(), "must be"); 1948 m = Reflection::new_constructor(method, CHECK_NULL); 1949 } else { 1950 m = Reflection::new_method(method, false, CHECK_NULL); 1951 } 1952 result->obj_at_put(i, m); 1953 } 1954 } 1955 1956 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1957 } 1958 1959 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1960 { 1961 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1962 /*want_constructor*/ false, 1963 vmClasses::reflect_Method_klass(), THREAD); 1964 } 1965 JVM_END 1966 1967 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1968 { 1969 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1970 /*want_constructor*/ true, 1971 vmClasses::reflect_Constructor_klass(), THREAD); 1972 } 1973 JVM_END 1974 1975 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1976 { 1977 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1978 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member)); 1979 return c->has_nestmate_access_to(m, THREAD); 1980 } 1981 JVM_END 1982 1983 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1984 { 1985 // current is not a primitive or array class 1986 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1987 InstanceKlass* host = c->nest_host(THREAD); 1988 return (jclass) (host == nullptr ? nullptr : 1989 JNIHandles::make_local(THREAD, host->java_mirror())); 1990 } 1991 JVM_END 1992 1993 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1994 { 1995 // current is not a primitive or array class 1996 ResourceMark rm(THREAD); 1997 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1998 InstanceKlass* host = c->nest_host(THREAD); 1999 2000 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 2001 c->external_name(), host->external_name()); 2002 { 2003 JvmtiVMObjectAllocEventCollector oam; 2004 Array<u2>* members = host->nest_members(); 2005 int length = members == nullptr ? 0 : members->length(); 2006 2007 log_trace(class, nestmates)(" - host has %d listed nest members", length); 2008 2009 // nest host is first in the array so make it one bigger 2010 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length + 1, CHECK_NULL); 2011 refArrayHandle result(THREAD, r); 2012 result->obj_at_put(0, host->java_mirror()); 2013 if (length != 0) { 2014 int count = 0; 2015 for (int i = 0; i < length; i++) { 2016 int cp_index = members->at(i); 2017 Klass* k = host->constants()->klass_at(cp_index, THREAD); 2018 if (HAS_PENDING_EXCEPTION) { 2019 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2020 return nullptr; // propagate VMEs 2021 } 2022 if (log_is_enabled(Trace, class, nestmates)) { 2023 stringStream ss; 2024 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2025 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2026 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2027 log_trace(class, nestmates)("%s", ss.as_string()); 2028 } 2029 CLEAR_PENDING_EXCEPTION; 2030 continue; 2031 } 2032 if (k->is_instance_klass()) { 2033 InstanceKlass* ik = InstanceKlass::cast(k); 2034 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2035 if (nest_host_k == host) { 2036 result->obj_at_put(count+1, k->java_mirror()); 2037 count++; 2038 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2039 } else { 2040 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2041 ik->external_name(), nest_host_k->external_name()); 2042 } 2043 } else { 2044 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2045 k->external_name()); 2046 } 2047 } 2048 if (count < length) { 2049 // we had invalid entries so we need to compact the array 2050 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2051 length + 1, count + 1); 2052 2053 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2054 count + 1, CHECK_NULL); 2055 objArrayHandle result2(THREAD, r2); 2056 for (int i = 0; i < count + 1; i++) { 2057 result2->obj_at_put(i, result->obj_at(i)); 2058 } 2059 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2060 } 2061 } 2062 else { 2063 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate"); 2064 } 2065 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2066 } 2067 } 2068 JVM_END 2069 2070 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2071 { 2072 oop mirror = JNIHandles::resolve_non_null(current); 2073 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2074 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 2075 2076 ResourceMark rm(THREAD); 2077 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2078 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2079 if (ik->is_sealed()) { 2080 JvmtiVMObjectAllocEventCollector oam; 2081 Array<u2>* subclasses = ik->permitted_subclasses(); 2082 int length = subclasses->length(); 2083 2084 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2085 2086 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length, CHECK_NULL); 2087 refArrayHandle result(THREAD, r); 2088 int count = 0; 2089 for (int i = 0; i < length; i++) { 2090 int cp_index = subclasses->at(i); 2091 Klass* k = ik->constants()->klass_at(cp_index, THREAD); 2092 if (HAS_PENDING_EXCEPTION) { 2093 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2094 return nullptr; // propagate VMEs 2095 } 2096 if (log_is_enabled(Trace, class, sealed)) { 2097 stringStream ss; 2098 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2099 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2100 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2101 log_trace(class, sealed)("%s", ss.as_string()); 2102 } 2103 2104 CLEAR_PENDING_EXCEPTION; 2105 continue; 2106 } 2107 if (k->is_instance_klass()) { 2108 result->obj_at_put(count++, k->java_mirror()); 2109 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2110 } 2111 } 2112 if (count < length) { 2113 // we had invalid entries so we need to compact the array 2114 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2115 count, CHECK_NULL); 2116 objArrayHandle result2(THREAD, r2); 2117 for (int i = 0; i < count; i++) { 2118 result2->obj_at_put(i, result->obj_at(i)); 2119 } 2120 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2121 } 2122 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2123 } else { 2124 return nullptr; 2125 } 2126 } 2127 JVM_END 2128 2129 // Constant pool access ////////////////////////////////////////////////////////// 2130 2131 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2132 { 2133 JvmtiVMObjectAllocEventCollector oam; 2134 oop mirror = JNIHandles::resolve_non_null(cls); 2135 // Return null for primitives and arrays 2136 if (!java_lang_Class::is_primitive(mirror)) { 2137 Klass* k = java_lang_Class::as_Klass(mirror); 2138 if (k->is_instance_klass()) { 2139 InstanceKlass* k_h = InstanceKlass::cast(k); 2140 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2141 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2142 return JNIHandles::make_local(THREAD, jcp()); 2143 } 2144 } 2145 return nullptr; 2146 } 2147 JVM_END 2148 2149 2150 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj)) 2151 { 2152 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2153 return cp->length(); 2154 } 2155 JVM_END 2156 2157 2158 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index)) 2159 { 2160 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2161 bounds_check(cp, index, CHECK_NULL); 2162 constantTag tag = cp->tag_at(index); 2163 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2164 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2165 } 2166 Klass* k = cp->klass_at(index, CHECK_NULL); 2167 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2168 } 2169 JVM_END 2170 2171 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2172 { 2173 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2174 bounds_check(cp, index, CHECK_NULL); 2175 constantTag tag = cp->tag_at(index); 2176 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2177 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2178 } 2179 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2180 if (k == nullptr) return nullptr; 2181 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2182 } 2183 JVM_END 2184 2185 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2186 constantTag tag = cp->tag_at(index); 2187 if (!tag.is_method() && !tag.is_interface_method()) { 2188 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2189 } 2190 int klass_ref = cp->uncached_klass_ref_index_at(index); 2191 Klass* k_o; 2192 if (force_resolution) { 2193 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2194 } else { 2195 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2196 if (k_o == nullptr) return nullptr; 2197 } 2198 InstanceKlass* k = InstanceKlass::cast(k_o); 2199 Symbol* name = cp->uncached_name_ref_at(index); 2200 Symbol* sig = cp->uncached_signature_ref_at(index); 2201 methodHandle m (THREAD, k->find_method(name, sig)); 2202 if (m.is_null()) { 2203 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2204 } 2205 oop method; 2206 if (m->is_object_constructor()) { 2207 method = Reflection::new_constructor(m, CHECK_NULL); 2208 } else { 2209 method = Reflection::new_method(m, true, CHECK_NULL); 2210 } 2211 return JNIHandles::make_local(THREAD, method); 2212 } 2213 2214 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index)) 2215 { 2216 JvmtiVMObjectAllocEventCollector oam; 2217 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2218 bounds_check(cp, index, CHECK_NULL); 2219 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2220 return res; 2221 } 2222 JVM_END 2223 2224 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2225 { 2226 JvmtiVMObjectAllocEventCollector oam; 2227 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2228 bounds_check(cp, index, CHECK_NULL); 2229 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2230 return res; 2231 } 2232 JVM_END 2233 2234 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2235 constantTag tag = cp->tag_at(index); 2236 if (!tag.is_field()) { 2237 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2238 } 2239 int klass_ref = cp->uncached_klass_ref_index_at(index); 2240 Klass* k_o; 2241 if (force_resolution) { 2242 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2243 } else { 2244 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2245 if (k_o == nullptr) return nullptr; 2246 } 2247 InstanceKlass* k = InstanceKlass::cast(k_o); 2248 Symbol* name = cp->uncached_name_ref_at(index); 2249 Symbol* sig = cp->uncached_signature_ref_at(index); 2250 fieldDescriptor fd; 2251 Klass* target_klass = k->find_field(name, sig, &fd); 2252 if (target_klass == nullptr) { 2253 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2254 } 2255 oop field = Reflection::new_field(&fd, CHECK_NULL); 2256 return JNIHandles::make_local(THREAD, field); 2257 } 2258 2259 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index)) 2260 { 2261 JvmtiVMObjectAllocEventCollector oam; 2262 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2263 bounds_check(cp, index, CHECK_NULL); 2264 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2265 return res; 2266 } 2267 JVM_END 2268 2269 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2270 { 2271 JvmtiVMObjectAllocEventCollector oam; 2272 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2273 bounds_check(cp, index, CHECK_NULL); 2274 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2275 return res; 2276 } 2277 JVM_END 2278 2279 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index)) 2280 { 2281 JvmtiVMObjectAllocEventCollector oam; 2282 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2283 bounds_check(cp, index, CHECK_NULL); 2284 constantTag tag = cp->tag_at(index); 2285 if (!tag.is_field_or_method()) { 2286 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2287 } 2288 int klass_ref = cp->uncached_klass_ref_index_at(index); 2289 Symbol* klass_name = cp->klass_name_at(klass_ref); 2290 Symbol* member_name = cp->uncached_name_ref_at(index); 2291 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2292 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2293 objArrayHandle dest(THREAD, dest_o); 2294 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2295 dest->obj_at_put(0, str()); 2296 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2297 dest->obj_at_put(1, str()); 2298 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2299 dest->obj_at_put(2, str()); 2300 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2301 } 2302 JVM_END 2303 2304 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index)) 2305 { 2306 JvmtiVMObjectAllocEventCollector oam; 2307 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2308 bounds_check(cp, index, CHECK_0); 2309 constantTag tag = cp->tag_at(index); 2310 if (!tag.is_field_or_method()) { 2311 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2312 } 2313 return (jint) cp->uncached_klass_ref_index_at(index); 2314 } 2315 JVM_END 2316 2317 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index)) 2318 { 2319 JvmtiVMObjectAllocEventCollector oam; 2320 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2321 bounds_check(cp, index, CHECK_0); 2322 constantTag tag = cp->tag_at(index); 2323 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2324 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2325 } 2326 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2327 } 2328 JVM_END 2329 2330 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index)) 2331 { 2332 JvmtiVMObjectAllocEventCollector oam; 2333 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2334 bounds_check(cp, index, CHECK_NULL); 2335 constantTag tag = cp->tag_at(index); 2336 if (!tag.is_name_and_type()) { 2337 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2338 } 2339 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2340 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2341 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2342 objArrayHandle dest(THREAD, dest_o); 2343 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2344 dest->obj_at_put(0, str()); 2345 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2346 dest->obj_at_put(1, str()); 2347 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2348 } 2349 JVM_END 2350 2351 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index)) 2352 { 2353 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2354 bounds_check(cp, index, CHECK_0); 2355 constantTag tag = cp->tag_at(index); 2356 if (!tag.is_int()) { 2357 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2358 } 2359 return cp->int_at(index); 2360 } 2361 JVM_END 2362 2363 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index)) 2364 { 2365 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2366 bounds_check(cp, index, CHECK_(0L)); 2367 constantTag tag = cp->tag_at(index); 2368 if (!tag.is_long()) { 2369 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2370 } 2371 return cp->long_at(index); 2372 } 2373 JVM_END 2374 2375 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index)) 2376 { 2377 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2378 bounds_check(cp, index, CHECK_(0.0f)); 2379 constantTag tag = cp->tag_at(index); 2380 if (!tag.is_float()) { 2381 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2382 } 2383 return cp->float_at(index); 2384 } 2385 JVM_END 2386 2387 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index)) 2388 { 2389 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2390 bounds_check(cp, index, CHECK_(0.0)); 2391 constantTag tag = cp->tag_at(index); 2392 if (!tag.is_double()) { 2393 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2394 } 2395 return cp->double_at(index); 2396 } 2397 JVM_END 2398 2399 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index)) 2400 { 2401 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2402 bounds_check(cp, index, CHECK_NULL); 2403 constantTag tag = cp->tag_at(index); 2404 if (!tag.is_string()) { 2405 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2406 } 2407 oop str = cp->string_at(index, CHECK_NULL); 2408 return (jstring) JNIHandles::make_local(THREAD, str); 2409 } 2410 JVM_END 2411 2412 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index)) 2413 { 2414 JvmtiVMObjectAllocEventCollector oam; 2415 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2416 bounds_check(cp, index, CHECK_NULL); 2417 constantTag tag = cp->tag_at(index); 2418 if (!tag.is_symbol()) { 2419 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2420 } 2421 Symbol* sym = cp->symbol_at(index); 2422 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2423 return (jstring) JNIHandles::make_local(THREAD, str()); 2424 } 2425 JVM_END 2426 2427 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index)) 2428 { 2429 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2430 bounds_check(cp, index, CHECK_0); 2431 constantTag tag = cp->tag_at(index); 2432 jbyte result = tag.value(); 2433 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2434 // they are changed to the corresponding tags from the JVM spec, so that java code in 2435 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2436 if (tag.is_klass_or_reference()) { 2437 result = JVM_CONSTANT_Class; 2438 } else if (tag.is_string_index()) { 2439 result = JVM_CONSTANT_String; 2440 } else if (tag.is_method_type_in_error()) { 2441 result = JVM_CONSTANT_MethodType; 2442 } else if (tag.is_method_handle_in_error()) { 2443 result = JVM_CONSTANT_MethodHandle; 2444 } else if (tag.is_dynamic_constant_in_error()) { 2445 result = JVM_CONSTANT_Dynamic; 2446 } 2447 return result; 2448 } 2449 JVM_END 2450 2451 // Assertion support. ////////////////////////////////////////////////////////// 2452 2453 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2454 assert(cls != nullptr, "bad class"); 2455 2456 oop r = JNIHandles::resolve(cls); 2457 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2458 if (java_lang_Class::is_primitive(r)) return false; 2459 2460 Klass* k = java_lang_Class::as_Klass(r); 2461 assert(k->is_instance_klass(), "must be an instance klass"); 2462 if (!k->is_instance_klass()) return false; 2463 2464 ResourceMark rm(THREAD); 2465 const char* name = k->name()->as_C_string(); 2466 bool system_class = k->class_loader() == nullptr; 2467 return JavaAssertions::enabled(name, system_class); 2468 2469 JVM_END 2470 2471 2472 // Return a new AssertionStatusDirectives object with the fields filled in with 2473 // command-line assertion arguments (i.e., -ea, -da). 2474 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2475 JvmtiVMObjectAllocEventCollector oam; 2476 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2477 return JNIHandles::make_local(THREAD, asd); 2478 JVM_END 2479 2480 // Verification //////////////////////////////////////////////////////////////////////////////// 2481 2482 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2483 2484 // RedefineClasses support: bug 6214132 caused verification to fail. 2485 // All functions from this section, unless noted otherwise, should call the functions 2486 // get_klass_considering_redefinition(), or 2487 // get_instance_klass_considering_redefinition() 2488 // These functions return JvmtiThreadState::_scratch_class if the verifier 2489 // was invoked in the middle of the redefinition of cls. 2490 // See jvmtiThreadState.hpp for details. 2491 2492 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) { 2493 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2494 if (k->is_instance_klass()) { 2495 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread); 2496 } else { 2497 return k; 2498 } 2499 } 2500 2501 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) { 2502 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls)); 2503 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread); 2504 } 2505 2506 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 2507 oop mirror = JNIHandles::resolve_non_null(cls); 2508 if (java_lang_Class::is_primitive(mirror)) { 2509 return JNI_FALSE; 2510 } 2511 Klass* k = java_lang_Class::as_Klass(mirror); 2512 // This isn't necessary since answer is the same because redefinition 2513 // has already checked this matches for the scratch class. 2514 // k = get_klass_considering_redefinition(cls, thread) 2515 jboolean result = k->is_interface(); 2516 assert(!result || k->is_instance_klass(), 2517 "all interfaces are instance types"); 2518 return result; 2519 JVM_END 2520 2521 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2522 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name. 2523 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2524 return k->name()->as_utf8(); 2525 JVM_END 2526 2527 2528 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2529 Klass* k = get_klass_considering_redefinition(cls, thread); 2530 // types will have length zero if this is not an InstanceKlass 2531 // (length is determined by call to JVM_GetClassCPEntriesCount) 2532 if (k->is_instance_klass()) { 2533 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2534 for (int index = cp->length() - 1; index >= 0; index--) { 2535 constantTag tag = cp->tag_at(index); 2536 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2537 } 2538 } 2539 JVM_END 2540 2541 2542 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2543 Klass* k = get_klass_considering_redefinition(cls, thread); 2544 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2545 JVM_END 2546 2547 2548 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2549 Klass* k = get_klass_considering_redefinition(cls, thread); 2550 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2551 JVM_END 2552 2553 2554 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2555 Klass* k = get_klass_considering_redefinition(cls, thread); 2556 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2557 JVM_END 2558 2559 2560 // The following methods, used for the verifier, are never called with 2561 // array klasses, so a direct cast to InstanceKlass is safe. 2562 // Typically, these methods are called in a loop with bounds determined 2563 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2564 // zero for arrays. 2565 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2566 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2567 Method* method = ik->methods()->at(method_index); 2568 int length = method->checked_exceptions_length(); 2569 if (length > 0) { 2570 CheckedExceptionElement* table= method->checked_exceptions_start(); 2571 for (int i = 0; i < length; i++) { 2572 exceptions[i] = table[i].class_cp_index; 2573 } 2574 } 2575 JVM_END 2576 2577 2578 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2579 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2580 Method* method = ik->methods()->at(method_index); 2581 return method->checked_exceptions_length(); 2582 JVM_END 2583 2584 2585 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2586 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2587 Method* method = ik->methods()->at(method_index); 2588 memcpy(code, method->code_base(), method->code_size()); 2589 JVM_END 2590 2591 2592 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2593 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2594 Method* method = ik->methods()->at(method_index); 2595 return method->code_size(); 2596 JVM_END 2597 2598 2599 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2600 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2601 Method* method = ik->methods()->at(method_index); 2602 ExceptionTable extable(method); 2603 entry->start_pc = extable.start_pc(entry_index); 2604 entry->end_pc = extable.end_pc(entry_index); 2605 entry->handler_pc = extable.handler_pc(entry_index); 2606 entry->catchType = extable.catch_type_index(entry_index); 2607 JVM_END 2608 2609 2610 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2611 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2612 Method* method = ik->methods()->at(method_index); 2613 return method->exception_table_length(); 2614 JVM_END 2615 2616 2617 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2618 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2619 Method* method = ik->methods()->at(method_index); 2620 return method->access_flags().as_method_flags(); 2621 JVM_END 2622 2623 2624 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2625 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2626 return ik->field_access_flags(field_index); 2627 JVM_END 2628 2629 2630 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2631 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2632 Method* method = ik->methods()->at(method_index); 2633 return method->max_locals(); 2634 JVM_END 2635 2636 2637 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2638 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2639 Method* method = ik->methods()->at(method_index); 2640 return method->size_of_parameters(); 2641 JVM_END 2642 2643 2644 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2645 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2646 Method* method = ik->methods()->at(method_index); 2647 return method->verifier_max_stack(); 2648 JVM_END 2649 2650 2651 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2652 ResourceMark rm(THREAD); 2653 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2654 Method* method = ik->methods()->at(method_index); 2655 return method->is_object_constructor(); 2656 JVM_END 2657 2658 2659 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2660 ResourceMark rm(THREAD); 2661 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2662 Method* method = ik->methods()->at(method_index); 2663 return method->is_overpass(); 2664 JVM_END 2665 2666 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2667 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2668 Method* method = ik->methods()->at(method_index); 2669 return method->name()->as_utf8(); 2670 JVM_END 2671 2672 2673 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2674 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2675 Method* method = ik->methods()->at(method_index); 2676 return method->signature()->as_utf8(); 2677 JVM_END 2678 2679 /** 2680 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2681 * read entries in the constant pool. Since the old verifier always 2682 * works on a copy of the code, it will not see any rewriting that 2683 * may possibly occur in the middle of verification. So it is important 2684 * that nothing it calls tries to use the cpCache instead of the raw 2685 * constant pool, so we must use cp->uncached_x methods when appropriate. 2686 */ 2687 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2688 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2689 ConstantPool* cp = ik->constants(); 2690 switch (cp->tag_at(cp_index).value()) { 2691 case JVM_CONSTANT_Fieldref: 2692 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2693 default: 2694 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2695 } 2696 ShouldNotReachHere(); 2697 return nullptr; 2698 JVM_END 2699 2700 2701 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2702 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2703 ConstantPool* cp = ik->constants(); 2704 switch (cp->tag_at(cp_index).value()) { 2705 case JVM_CONSTANT_InterfaceMethodref: 2706 case JVM_CONSTANT_Methodref: 2707 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2708 default: 2709 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2710 } 2711 ShouldNotReachHere(); 2712 return nullptr; 2713 JVM_END 2714 2715 2716 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2717 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2718 ConstantPool* cp = ik->constants(); 2719 switch (cp->tag_at(cp_index).value()) { 2720 case JVM_CONSTANT_InterfaceMethodref: 2721 case JVM_CONSTANT_Methodref: 2722 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2723 default: 2724 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2725 } 2726 ShouldNotReachHere(); 2727 return nullptr; 2728 JVM_END 2729 2730 2731 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2732 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2733 ConstantPool* cp = ik->constants(); 2734 switch (cp->tag_at(cp_index).value()) { 2735 case JVM_CONSTANT_Fieldref: 2736 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2737 default: 2738 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2739 } 2740 ShouldNotReachHere(); 2741 return nullptr; 2742 JVM_END 2743 2744 2745 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2746 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2747 ConstantPool* cp = ik->constants(); 2748 Symbol* classname = cp->klass_name_at(cp_index); 2749 return classname->as_utf8(); 2750 JVM_END 2751 2752 2753 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2754 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2755 ConstantPool* cp = ik->constants(); 2756 switch (cp->tag_at(cp_index).value()) { 2757 case JVM_CONSTANT_Fieldref: { 2758 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2759 Symbol* classname = cp->klass_name_at(class_index); 2760 return classname->as_utf8(); 2761 } 2762 default: 2763 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2764 } 2765 ShouldNotReachHere(); 2766 return nullptr; 2767 JVM_END 2768 2769 2770 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2771 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2772 ConstantPool* cp = ik->constants(); 2773 switch (cp->tag_at(cp_index).value()) { 2774 case JVM_CONSTANT_Methodref: 2775 case JVM_CONSTANT_InterfaceMethodref: { 2776 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2777 Symbol* classname = cp->klass_name_at(class_index); 2778 return classname->as_utf8(); 2779 } 2780 default: 2781 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2782 } 2783 ShouldNotReachHere(); 2784 return nullptr; 2785 JVM_END 2786 2787 2788 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2789 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2790 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread); 2791 ConstantPool* cp = ik->constants(); 2792 ConstantPool* cp_called = ik_called->constants(); 2793 switch (cp->tag_at(cp_index).value()) { 2794 case JVM_CONSTANT_Fieldref: { 2795 Symbol* name = cp->uncached_name_ref_at(cp_index); 2796 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2797 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) { 2798 if (fs.name() == name && fs.signature() == signature) { 2799 return fs.access_flags().as_field_flags(); 2800 } 2801 } 2802 return -1; 2803 } 2804 default: 2805 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2806 } 2807 ShouldNotReachHere(); 2808 return 0; 2809 JVM_END 2810 2811 2812 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2813 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2814 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread); 2815 ConstantPool* cp = ik->constants(); 2816 switch (cp->tag_at(cp_index).value()) { 2817 case JVM_CONSTANT_Methodref: 2818 case JVM_CONSTANT_InterfaceMethodref: { 2819 Symbol* name = cp->uncached_name_ref_at(cp_index); 2820 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2821 Array<Method*>* methods = ik_called->methods(); 2822 int methods_count = methods->length(); 2823 for (int i = 0; i < methods_count; i++) { 2824 Method* method = methods->at(i); 2825 if (method->name() == name && method->signature() == signature) { 2826 return method->access_flags().as_method_flags(); 2827 } 2828 } 2829 return -1; 2830 } 2831 default: 2832 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2833 } 2834 ShouldNotReachHere(); 2835 return 0; 2836 JVM_END 2837 2838 2839 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2840 2841 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2842 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2843 JVM_END 2844 2845 2846 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2847 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2848 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2849 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2850 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2851 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2852 JVM_END 2853 2854 // Printing support ////////////////////////////////////////////////// 2855 extern "C" { 2856 2857 ATTRIBUTE_PRINTF(3, 0) 2858 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2859 // Reject count values that are negative signed values converted to 2860 // unsigned; see bug 4399518, 4417214 2861 if ((intptr_t)count <= 0) return -1; 2862 2863 int result = os::vsnprintf(str, count, fmt, args); 2864 if (result > 0 && (size_t)result >= count) { 2865 result = -1; 2866 } 2867 2868 return result; 2869 } 2870 2871 ATTRIBUTE_PRINTF(3, 4) 2872 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2873 va_list args; 2874 int len; 2875 va_start(args, fmt); 2876 len = jio_vsnprintf(str, count, fmt, args); 2877 va_end(args); 2878 return len; 2879 } 2880 2881 ATTRIBUTE_PRINTF(2, 3) 2882 int jio_fprintf(FILE* f, const char *fmt, ...) { 2883 int len; 2884 va_list args; 2885 va_start(args, fmt); 2886 len = jio_vfprintf(f, fmt, args); 2887 va_end(args); 2888 return len; 2889 } 2890 2891 ATTRIBUTE_PRINTF(2, 0) 2892 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2893 if (Arguments::vfprintf_hook() != nullptr) { 2894 return Arguments::vfprintf_hook()(f, fmt, args); 2895 } else { 2896 return vfprintf(f, fmt, args); 2897 } 2898 } 2899 2900 ATTRIBUTE_PRINTF(1, 2) 2901 JNIEXPORT int jio_printf(const char *fmt, ...) { 2902 int len; 2903 va_list args; 2904 va_start(args, fmt); 2905 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2906 va_end(args); 2907 return len; 2908 } 2909 2910 // HotSpot specific jio method 2911 void jio_print(const char* s, size_t len) { 2912 // Try to make this function as atomic as possible. 2913 if (Arguments::vfprintf_hook() != nullptr) { 2914 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2915 } else { 2916 // Make an unused local variable to avoid warning from gcc compiler. 2917 bool dummy = os::write(defaultStream::output_fd(), s, len); 2918 } 2919 } 2920 2921 } // Extern C 2922 2923 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2924 2925 // In most of the JVM thread support functions we need to access the 2926 // thread through a ThreadsListHandle to prevent it from exiting and 2927 // being reclaimed while we try to operate on it. The exceptions to this 2928 // rule are when operating on the current thread, or if the monitor of 2929 // the target java.lang.Thread is locked at the Java level - in both 2930 // cases the target cannot exit. 2931 2932 static void thread_entry(JavaThread* thread, TRAPS) { 2933 HandleMark hm(THREAD); 2934 Handle obj(THREAD, thread->threadObj()); 2935 JavaValue result(T_VOID); 2936 JavaCalls::call_virtual(&result, 2937 obj, 2938 vmClasses::Thread_klass(), 2939 vmSymbols::run_method_name(), 2940 vmSymbols::void_method_signature(), 2941 THREAD); 2942 } 2943 2944 2945 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2946 #if INCLUDE_CDS 2947 if (CDSConfig::allow_only_single_java_thread()) { 2948 // During java -Xshare:dump, if we allow multiple Java threads to 2949 // execute in parallel, symbols and classes may be loaded in 2950 // random orders which will make the resulting CDS archive 2951 // non-deterministic. 2952 // 2953 // Lucikly, during java -Xshare:dump, it's important to run only 2954 // the code in the main Java thread (which is NOT started here) that 2955 // creates the module graph, etc. It's safe to not start the other 2956 // threads which are launched by class static initializers 2957 // (ReferenceHandler, FinalizerThread and CleanerImpl). 2958 if (log_is_enabled(Info, aot)) { 2959 ResourceMark rm; 2960 oop t = JNIHandles::resolve_non_null(jthread); 2961 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 2962 } 2963 return; 2964 } 2965 #endif 2966 JavaThread *native_thread = nullptr; 2967 2968 // We cannot hold the Threads_lock when we throw an exception, 2969 // due to rank ordering issues. Example: we might need to grab the 2970 // Heap_lock while we construct the exception. 2971 bool throw_illegal_thread_state = false; 2972 2973 // We must release the Threads_lock before we can post a jvmti event 2974 // in Thread::start. 2975 { 2976 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock); 2977 // Ensure that the C++ Thread and OSThread structures aren't freed before 2978 // we operate. 2979 MutexLocker ml(Threads_lock); 2980 2981 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2982 // re-starting an already started thread, so we should usually find 2983 // that the JavaThread is null. However for a JNI attached thread 2984 // there is a small window between the Thread object being created 2985 // (with its JavaThread set) and the update to its threadStatus, so we 2986 // have to check for this 2987 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 2988 throw_illegal_thread_state = true; 2989 } else { 2990 jlong size = 2991 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2992 // Allocate the C++ Thread structure and create the native thread. The 2993 // stack size retrieved from java is 64-bit signed, but the constructor takes 2994 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2995 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2996 // - Avoid passing negative values which would result in really large stacks. 2997 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2998 size_t sz = size > 0 ? (size_t) size : 0; 2999 native_thread = new JavaThread(&thread_entry, sz); 3000 3001 // At this point it may be possible that no osthread was created for the 3002 // JavaThread due to lack of memory. Check for this situation and throw 3003 // an exception if necessary. Eventually we may want to change this so 3004 // that we only grab the lock if the thread was created successfully - 3005 // then we can also do this check and throw the exception in the 3006 // JavaThread constructor. 3007 if (native_thread->osthread() != nullptr) { 3008 // Note: the current thread is not being used within "prepare". 3009 native_thread->prepare(jthread); 3010 } 3011 } 3012 } 3013 3014 if (throw_illegal_thread_state) { 3015 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3016 } 3017 3018 assert(native_thread != nullptr, "Starting null thread?"); 3019 3020 if (native_thread->osthread() == nullptr) { 3021 ResourceMark rm(thread); 3022 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 3023 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 3024 // No one should hold a reference to the 'native_thread'. 3025 native_thread->smr_delete(); 3026 if (JvmtiExport::should_post_resource_exhausted()) { 3027 JvmtiExport::post_resource_exhausted( 3028 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3029 os::native_thread_creation_failed_msg()); 3030 } 3031 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3032 os::native_thread_creation_failed_msg()); 3033 } 3034 3035 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3036 3037 Thread::start(native_thread); 3038 3039 JVM_END 3040 3041 3042 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3043 ThreadsListHandle tlh(thread); 3044 oop java_thread = nullptr; 3045 JavaThread* receiver = nullptr; 3046 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3047 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3048 3049 if (is_alive) { 3050 // jthread refers to a live JavaThread. 3051 Thread::set_priority(receiver, (ThreadPriority)prio); 3052 } 3053 // Implied else: If the JavaThread hasn't started yet, then the 3054 // priority set in the java.lang.Thread object above will be pushed 3055 // down when it does start. 3056 JVM_END 3057 3058 3059 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3060 HOTSPOT_THREAD_YIELD(); 3061 os::naked_yield(); 3062 JVM_END 3063 3064 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos)) 3065 if (nanos < 0) { 3066 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range"); 3067 } 3068 3069 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3070 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3071 } 3072 3073 // Save current thread state and restore it at the end of this block. 3074 // And set new thread state to SLEEPING. 3075 JavaThreadSleepState jtss(thread); 3076 3077 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC); 3078 3079 if (nanos == 0) { 3080 os::naked_yield(); 3081 } else { 3082 ThreadState old_state = thread->osthread()->get_state(); 3083 thread->osthread()->set_state(SLEEPING); 3084 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed 3085 // An asynchronous exception could have been thrown on 3086 // us while we were sleeping. We do not overwrite those. 3087 if (!HAS_PENDING_EXCEPTION) { 3088 HOTSPOT_THREAD_SLEEP_END(1); 3089 if (!thread->has_async_exception_condition()) { 3090 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3091 // to properly restore the thread state. That's likely wrong. 3092 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3093 } 3094 } 3095 } 3096 thread->osthread()->set_state(old_state); 3097 } 3098 HOTSPOT_THREAD_SLEEP_END(0); 3099 JVM_END 3100 3101 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3102 oop jthread = thread->threadObj(); 3103 assert(jthread != nullptr, "no current carrier thread!"); 3104 return JNIHandles::make_local(THREAD, jthread); 3105 JVM_END 3106 3107 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3108 oop theThread = thread->vthread(); 3109 assert(theThread != (oop)nullptr, "no current thread!"); 3110 return JNIHandles::make_local(THREAD, theThread); 3111 JVM_END 3112 3113 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3114 jobject theThread)) 3115 oop threadObj = JNIHandles::resolve(theThread); 3116 thread->set_vthread(threadObj); 3117 3118 // Set _monitor_owner_id of new current Thread 3119 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj)); 3120 3121 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3122 JVM_END 3123 3124 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3125 return ThreadIdentifier::unsafe_offset(); 3126 JVM_END 3127 3128 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3129 ThreadsListHandle tlh(thread); 3130 JavaThread* receiver = nullptr; 3131 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3132 if (is_alive) { 3133 // jthread refers to a live JavaThread. 3134 receiver->interrupt(); 3135 } 3136 JVM_END 3137 3138 // Return true iff the current thread has locked the object passed in 3139 3140 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3141 if (obj == nullptr) { 3142 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3143 } 3144 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3145 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3146 JVM_END 3147 3148 JVM_ENTRY(jobjectArray, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3149 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD); 3150 return (jobjectArray) JNIHandles::make_local(THREAD, trace); 3151 JVM_END 3152 3153 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread)) 3154 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD); 3155 return JNIHandles::make_local(THREAD, snapshot); 3156 JVM_END 3157 3158 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3159 // We don't use a ThreadsListHandle here because the current thread 3160 // must be alive. 3161 oop java_thread = JNIHandles::resolve_non_null(jthread); 3162 JavaThread* thr = java_lang_Thread::thread(java_thread); 3163 if (thread == thr && !thr->has_attached_via_jni()) { 3164 // Thread naming is only supported for the current thread and 3165 // we don't set the name of an attached thread to avoid stepping 3166 // on other programs. 3167 ResourceMark rm(thread); 3168 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3169 os::set_native_thread_name(thread_name); 3170 } 3171 JVM_END 3172 3173 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3174 oop theCache = thread->scopedValueCache(); 3175 return JNIHandles::make_local(THREAD, theCache); 3176 JVM_END 3177 3178 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3179 jobject theCache)) 3180 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3181 thread->set_scopedValueCache(objs); 3182 JVM_END 3183 3184 3185 // java.lang.Package //////////////////////////////////////////////////////////////// 3186 3187 3188 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3189 ResourceMark rm(THREAD); 3190 JvmtiVMObjectAllocEventCollector oam; 3191 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3192 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3193 return (jstring) JNIHandles::make_local(THREAD, result); 3194 JVM_END 3195 3196 3197 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3198 JvmtiVMObjectAllocEventCollector oam; 3199 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3200 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3201 JVM_END 3202 3203 3204 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3205 3206 3207 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3208 MonitorLocker ml(Heap_lock); 3209 oop ref = Universe::reference_pending_list(); 3210 if (ref != nullptr) { 3211 Universe::clear_reference_pending_list(); 3212 } 3213 return JNIHandles::make_local(THREAD, ref); 3214 JVM_END 3215 3216 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3217 MonitorLocker ml(Heap_lock); 3218 return Universe::has_reference_pending_list(); 3219 JVM_END 3220 3221 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3222 MonitorLocker ml(Heap_lock); 3223 while (!Universe::has_reference_pending_list()) { 3224 ml.wait(); 3225 } 3226 JVM_END 3227 3228 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref)) 3229 oop ref_oop = JNIHandles::resolve_non_null(ref); 3230 // PhantomReference has its own implementation of get(). 3231 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3232 oop referent = java_lang_ref_Reference::weak_referent(ref_oop); 3233 return JNIHandles::make_local(THREAD, referent); 3234 JVM_END 3235 3236 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3237 oop ref_oop = JNIHandles::resolve_non_null(ref); 3238 // PhantomReference has its own implementation of refersTo(). 3239 // See: JVM_PhantomReferenceRefersTo 3240 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3241 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3242 return referent == JNIHandles::resolve(o); 3243 JVM_END 3244 3245 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3246 oop ref_oop = JNIHandles::resolve_non_null(ref); 3247 // FinalReference has it's own implementation of clear(). 3248 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3249 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3250 // If the referent has already been cleared then done. 3251 // However, if the referent is dead but has not yet been cleared by 3252 // concurrent reference processing, it should NOT be cleared here. 3253 // Instead, clearing should be left to the GC. Clearing it here could 3254 // detectably lose an expected notification, which is impossible with 3255 // STW reference processing. The clearing in enqueue() doesn't have 3256 // this problem, since the enqueue covers the notification, but it's not 3257 // worth the effort to handle that case specially. 3258 return; 3259 } 3260 java_lang_ref_Reference::clear_referent(ref_oop); 3261 JVM_END 3262 3263 3264 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3265 3266 3267 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3268 oop ref_oop = JNIHandles::resolve_non_null(ref); 3269 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3270 return referent == JNIHandles::resolve(o); 3271 JVM_END 3272 3273 3274 // ObjectInputStream /////////////////////////////////////////////////////////////// 3275 3276 // Return the first user-defined class loader up the execution stack, or null 3277 // if only code from the bootstrap or platform class loader is on the stack. 3278 3279 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3280 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3281 InstanceKlass* ik = vfst.method()->method_holder(); 3282 oop loader = ik->class_loader(); 3283 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3284 return JNIHandles::make_local(THREAD, loader); 3285 } 3286 } 3287 return nullptr; 3288 JVM_END 3289 3290 3291 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3292 3293 3294 // resolve array handle and check arguments 3295 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3296 if (arr == nullptr) { 3297 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3298 } 3299 oop a = JNIHandles::resolve_non_null(arr); 3300 if (!a->is_array()) { 3301 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3302 } else if (type_array_only && !a->is_typeArray()) { 3303 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3304 } 3305 return arrayOop(a); 3306 } 3307 3308 3309 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3310 arrayOop a = check_array(env, arr, false, CHECK_0); 3311 return a->length(); 3312 JVM_END 3313 3314 3315 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3316 JvmtiVMObjectAllocEventCollector oam; 3317 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3318 jvalue value; 3319 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3320 oop box = Reflection::box(&value, type, CHECK_NULL); 3321 return JNIHandles::make_local(THREAD, box); 3322 JVM_END 3323 3324 3325 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3326 jvalue value; 3327 value.i = 0; // to initialize value before getting used in CHECK 3328 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3329 assert(a->is_typeArray(), "just checking"); 3330 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3331 BasicType wide_type = (BasicType) wCode; 3332 if (type != wide_type) { 3333 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3334 } 3335 return value; 3336 JVM_END 3337 3338 3339 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3340 arrayOop a = check_array(env, arr, false, CHECK); 3341 oop box = JNIHandles::resolve(val); 3342 jvalue value; 3343 value.i = 0; // to initialize value before getting used in CHECK 3344 BasicType value_type; 3345 if (a->is_objArray()) { 3346 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3347 value_type = Reflection::unbox_for_regular_object(box, &value); 3348 } else { 3349 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3350 } 3351 Reflection::array_set(&value, a, index, value_type, CHECK); 3352 JVM_END 3353 3354 3355 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3356 arrayOop a = check_array(env, arr, true, CHECK); 3357 assert(a->is_typeArray(), "just checking"); 3358 BasicType value_type = (BasicType) vCode; 3359 Reflection::array_set(&v, a, index, value_type, CHECK); 3360 JVM_END 3361 3362 3363 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3364 JvmtiVMObjectAllocEventCollector oam; 3365 oop element_mirror = JNIHandles::resolve(eltClass); 3366 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3367 return JNIHandles::make_local(THREAD, result); 3368 JVM_END 3369 3370 3371 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3372 JvmtiVMObjectAllocEventCollector oam; 3373 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3374 oop element_mirror = JNIHandles::resolve(eltClass); 3375 assert(dim_array->is_typeArray(), "just checking"); 3376 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3377 return JNIHandles::make_local(THREAD, result); 3378 JVM_END 3379 3380 3381 // Library support /////////////////////////////////////////////////////////////////////////// 3382 3383 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3384 return ZipLibrary::handle(); 3385 JVM_END 3386 3387 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3388 //%note jvm_ct 3389 char ebuf[1024]; 3390 void *load_result; 3391 { 3392 ThreadToNativeFromVM ttnfvm(thread); 3393 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3394 } 3395 if (load_result == nullptr) { 3396 if (throwException) { 3397 char msg[1024]; 3398 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3399 // Since 'ebuf' may contain a string encoded using 3400 // platform encoding scheme, we need to pass 3401 // Exceptions::unsafe_to_utf8 to the new_exception method 3402 // as the last argument. See bug 6367357. 3403 Handle h_exception = 3404 Exceptions::new_exception(thread, 3405 vmSymbols::java_lang_UnsatisfiedLinkError(), 3406 msg, Exceptions::unsafe_to_utf8); 3407 3408 THROW_HANDLE_NULL(h_exception); 3409 } else { 3410 log_info(library)("Failed to load library %s", name); 3411 return load_result; 3412 } 3413 } 3414 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3415 return load_result; 3416 JVM_END 3417 3418 3419 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3420 os::dll_unload(handle); 3421 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3422 JVM_END 3423 3424 3425 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3426 void* find_result = os::dll_lookup(handle, name); 3427 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3428 find_result != nullptr ? "Found" : "Failed to find", 3429 name, p2i(handle)); 3430 return find_result; 3431 JVM_END 3432 3433 3434 // JNI version /////////////////////////////////////////////////////////////////////////////// 3435 3436 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3437 return Threads::is_supported_jni_version_including_1_1(version); 3438 JVM_END 3439 3440 3441 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3442 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3443 JVM_END 3444 3445 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void)) 3446 return Arguments::is_valhalla_enabled() ? JNI_TRUE : JNI_FALSE; 3447 JVM_END 3448 3449 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3450 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3451 JVM_END 3452 3453 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void)) 3454 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE; 3455 JVM_END 3456 3457 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void)) 3458 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE; 3459 JVM_END 3460 3461 // String support /////////////////////////////////////////////////////////////////////////// 3462 3463 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3464 JvmtiVMObjectAllocEventCollector oam; 3465 if (str == nullptr) return nullptr; 3466 oop string = JNIHandles::resolve_non_null(str); 3467 oop result = StringTable::intern(string, CHECK_NULL); 3468 return (jstring) JNIHandles::make_local(THREAD, result); 3469 JVM_END 3470 3471 3472 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3473 3474 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3475 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3476 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3477 // in the safepoint protocol, thread suspension, thread interruption, or most things of that 3478 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has 3479 // shutdown. JavaThreads will be "in native" when using this API from JDK code. 3480 3481 3482 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3483 VM_Exit::block_if_vm_exited(); 3484 return new PlatformMutex(); 3485 } 3486 3487 3488 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3489 VM_Exit::block_if_vm_exited(); 3490 delete ((PlatformMutex*) mon); 3491 } 3492 3493 3494 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3495 VM_Exit::block_if_vm_exited(); 3496 ((PlatformMutex*) mon)->lock(); 3497 return 0; 3498 } 3499 3500 3501 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3502 VM_Exit::block_if_vm_exited(); 3503 ((PlatformMutex*) mon)->unlock(); 3504 } 3505 3506 3507 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3508 3509 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3510 Handle loader, jboolean throwError, TRAPS) { 3511 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL); 3512 3513 // Check if we should initialize the class 3514 if (init && klass->is_instance_klass()) { 3515 klass->initialize(CHECK_NULL); 3516 } 3517 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3518 } 3519 3520 3521 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3522 3523 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3524 Handle method_handle; 3525 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3526 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3527 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3528 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3529 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???"); 3530 3531 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3532 jobject res = JNIHandles::make_local(THREAD, result); 3533 if (JvmtiExport::should_post_vm_object_alloc()) { 3534 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3535 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3536 if (java_lang_Class::is_primitive(ret_type)) { 3537 // Only for primitive type vm allocates memory for java object. 3538 // See box() method. 3539 JvmtiExport::post_vm_object_alloc(thread, result); 3540 } 3541 } 3542 return res; 3543 } else { 3544 THROW_NULL(vmSymbols::java_lang_StackOverflowError()); 3545 } 3546 JVM_END 3547 3548 3549 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3550 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3551 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???"); 3552 oop constructor_mirror = JNIHandles::resolve(c); 3553 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3554 jobject res = JNIHandles::make_local(THREAD, result); 3555 if (JvmtiExport::should_post_vm_object_alloc()) { 3556 JvmtiExport::post_vm_object_alloc(thread, result); 3557 } 3558 return res; 3559 JVM_END 3560 3561 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3562 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3563 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3564 JVM_END 3565 3566 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3567 jclass caller, 3568 jstring interfaceMethodName, 3569 jobject factoryType, 3570 jobject interfaceMethodType, 3571 jobject implementationMember, 3572 jobject dynamicMethodType, 3573 jclass lambdaProxyClass)) 3574 #if INCLUDE_CDS 3575 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) { 3576 return; 3577 } 3578 3579 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller)); 3580 if (caller_ik->is_hidden()) { 3581 // Hidden classes not of type lambda proxy classes are currently not being archived. 3582 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3583 // registered for archiving. 3584 return; 3585 } 3586 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass)); 3587 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3588 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3589 3590 Symbol* interface_method_name = nullptr; 3591 if (interfaceMethodName != nullptr) { 3592 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3593 } 3594 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3595 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3596 3597 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3598 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3599 3600 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3601 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3602 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3603 3604 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3605 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3606 3607 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3608 interface_method_type, m, dynamic_method_type, THREAD); 3609 #endif // INCLUDE_CDS 3610 JVM_END 3611 3612 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3613 jclass caller, 3614 jstring interfaceMethodName, 3615 jobject factoryType, 3616 jobject interfaceMethodType, 3617 jobject implementationMember, 3618 jobject dynamicMethodType)) 3619 #if INCLUDE_CDS 3620 3621 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3622 implementationMember == nullptr || dynamicMethodType == nullptr) { 3623 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3624 } 3625 3626 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller)); 3627 if (!caller_ik->in_aot_cache()) { 3628 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3629 return nullptr; 3630 } 3631 3632 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3633 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3634 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3635 3636 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3637 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3638 3639 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3640 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3641 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3642 3643 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3644 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3645 3646 InstanceKlass* loaded_lambda = 3647 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3648 interface_method_type, m, dynamic_method_type, 3649 CHECK_(nullptr)); 3650 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3651 #else 3652 return nullptr; 3653 #endif // INCLUDE_CDS 3654 JVM_END 3655 3656 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3657 if (CDSConfig::is_dumping_static_archive()) { 3658 // We do this so that the default CDS archive can be deterministic. 3659 const char* release = VM_Version::vm_release(); 3660 const char* dbg_level = VM_Version::jdk_debug_level(); 3661 const char* version = VM_Version::internal_vm_info_string(); 3662 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3663 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3664 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3665 seed += (jlong)VM_Version::vm_major_version(); 3666 seed += (jlong)VM_Version::vm_minor_version(); 3667 seed += (jlong)VM_Version::vm_security_version(); 3668 seed += (jlong)VM_Version::vm_patch_version(); 3669 if (seed == 0) { // don't let this ever be zero. 3670 seed = 0x87654321; 3671 } 3672 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3673 return seed; 3674 } else { 3675 return 0; 3676 } 3677 JVM_END 3678 3679 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus()) 3680 return CDSConfig::get_status(); 3681 JVM_END 3682 3683 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3684 #if INCLUDE_CDS 3685 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity"); 3686 if (line != nullptr) { 3687 ResourceMark rm(THREAD); 3688 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3689 char* c_line = java_lang_String::as_utf8_string(h_line()); 3690 if (CDSConfig::is_dumping_dynamic_archive()) { 3691 // Note: LambdaFormInvokers::append take same format which is not 3692 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3693 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3694 } 3695 if (ClassListWriter::is_enabled()) { 3696 ClassListWriter w; 3697 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line); 3698 } 3699 } 3700 #endif // INCLUDE_CDS 3701 JVM_END 3702 3703 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3704 #if INCLUDE_CDS 3705 ResourceMark rm(THREAD); 3706 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3707 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3708 AOTMetaspace::dump_loaded_classes(file_name, THREAD); 3709 #endif // INCLUDE_CDS 3710 JVM_END 3711 3712 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3713 #if INCLUDE_CDS 3714 ResourceMark rm(THREAD); 3715 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3716 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3717 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3718 #endif // INCLUDE_CDS 3719 JVM_END 3720 3721 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls)) 3722 #if INCLUDE_CDS 3723 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3724 if (!k->is_instance_klass()) { 3725 return false; 3726 } else { 3727 if (InstanceKlass::cast(k)->is_enum_subclass() || 3728 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) { 3729 // This class will be cached in AOT-initialized state. No need for init barriers. 3730 return false; 3731 } else { 3732 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles 3733 // must emit barriers to ensure class initialization during production run. 3734 ResourceMark rm(THREAD); 3735 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name()); 3736 return true; 3737 } 3738 } 3739 #else 3740 return false; 3741 #endif // INCLUDE_CDS 3742 JVM_END 3743 3744 // Returns an array of all live Thread objects (VM internal JavaThreads, 3745 // jvmti agent threads, and JNI attaching threads are skipped) 3746 // See CR 6404306 regarding JNI attaching threads 3747 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3748 ResourceMark rm(THREAD); 3749 ThreadsListEnumerator tle(THREAD, false, false); 3750 JvmtiVMObjectAllocEventCollector oam; 3751 3752 int num_threads = tle.num_threads(); 3753 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3754 objArrayHandle threads_ah(THREAD, r); 3755 3756 for (int i = 0; i < num_threads; i++) { 3757 Handle h = tle.get_threadObj(i); 3758 threads_ah->obj_at_put(i, h()); 3759 } 3760 3761 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3762 JVM_END 3763 3764 3765 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3766 // Return StackTraceElement[][], each element is the stack trace of a thread in 3767 // the corresponding entry in the given threads array 3768 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3769 JvmtiVMObjectAllocEventCollector oam; 3770 3771 // Check if threads is null 3772 if (threads == nullptr) { 3773 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3774 } 3775 3776 refArrayOop a = oop_cast<refArrayOop>(JNIHandles::resolve_non_null(threads)); 3777 refArrayHandle ah(THREAD, a); 3778 int num_threads = ah->length(); 3779 // check if threads is non-empty array 3780 if (num_threads == 0) { 3781 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3782 } 3783 3784 // check if threads is not an array of objects of Thread class 3785 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3786 if (k != vmClasses::Thread_klass()) { 3787 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3788 } 3789 3790 ResourceMark rm(THREAD); 3791 3792 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3793 for (int i = 0; i < num_threads; i++) { 3794 oop thread_obj = ah->obj_at(i); 3795 instanceHandle h(THREAD, (instanceOop) thread_obj); 3796 thread_handle_array->append(h); 3797 } 3798 3799 // The JavaThread references in thread_handle_array are validated 3800 // in VM_ThreadDump::doit(). 3801 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3802 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3803 3804 JVM_END 3805 3806 // JVM monitoring and management support 3807 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3808 return Management::get_jmm_interface(version); 3809 JVM_END 3810 3811 // com.sun.tools.attach.VirtualMachine agent properties support 3812 // 3813 // Initialize the agent properties with the properties maintained in the VM 3814 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3815 ResourceMark rm; 3816 3817 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3818 3819 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3820 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3821 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3822 return properties; 3823 JVM_END 3824 3825 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3826 { 3827 JvmtiVMObjectAllocEventCollector oam; 3828 3829 if (ofClass == nullptr) { 3830 return nullptr; 3831 } 3832 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3833 // Special handling for primitive objects 3834 if (java_lang_Class::is_primitive(mirror())) { 3835 return nullptr; 3836 } 3837 Klass* k = java_lang_Class::as_Klass(mirror()); 3838 if (!k->is_instance_klass()) { 3839 return nullptr; 3840 } 3841 InstanceKlass* ik = InstanceKlass::cast(k); 3842 int encl_method_class_idx = ik->enclosing_method_class_index(); 3843 if (encl_method_class_idx == 0) { 3844 return nullptr; 3845 } 3846 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3847 objArrayHandle dest(THREAD, dest_o); 3848 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3849 dest->obj_at_put(0, enc_k->java_mirror()); 3850 int encl_method_method_idx = ik->enclosing_method_method_index(); 3851 if (encl_method_method_idx != 0) { 3852 Symbol* sym = ik->constants()->symbol_at( 3853 extract_low_short_from_int( 3854 ik->constants()->name_and_type_at(encl_method_method_idx))); 3855 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3856 dest->obj_at_put(1, str()); 3857 sym = ik->constants()->symbol_at( 3858 extract_high_short_from_int( 3859 ik->constants()->name_and_type_at(encl_method_method_idx))); 3860 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3861 dest->obj_at_put(2, str()); 3862 } 3863 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3864 } 3865 JVM_END 3866 3867 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3868 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3869 ResourceMark rm(THREAD); 3870 3871 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3872 return nullptr; 3873 } 3874 3875 char** vm_flags = Arguments::jvm_flags_array(); 3876 char** vm_args = Arguments::jvm_args_array(); 3877 int num_flags = Arguments::num_jvm_flags(); 3878 int num_args = Arguments::num_jvm_args(); 3879 3880 InstanceKlass* ik = vmClasses::String_klass(); 3881 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3882 objArrayHandle result_h(THREAD, r); 3883 3884 int index = 0; 3885 for (int j = 0; j < num_flags; j++, index++) { 3886 stringStream prefixed; 3887 prefixed.print("-XX:%s", vm_flags[j]); 3888 Handle h = java_lang_String::create_from_platform_dependent_str(prefixed.base(), CHECK_NULL); 3889 result_h->obj_at_put(index, h()); 3890 } 3891 for (int i = 0; i < num_args; i++, index++) { 3892 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3893 result_h->obj_at_put(index, h()); 3894 } 3895 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 3896 JVM_END 3897 3898 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 3899 return os::get_signal_number(name); 3900 JVM_END 3901 3902 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread)) 3903 oop vt = JNIHandles::resolve_external_guard(vthread); 3904 MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/); 3905 JVM_END 3906 3907 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread)) 3908 oop vt = JNIHandles::resolve_external_guard(vthread); 3909 MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/); 3910 JVM_END 3911 3912 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount)) 3913 oop vt = JNIHandles::resolve_external_guard(vthread); 3914 MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/); 3915 JVM_END 3916 3917 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount)) 3918 oop vt = JNIHandles::resolve_external_guard(vthread); 3919 MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/); 3920 JVM_END 3921 3922 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section. 3923 // Needed to avoid deadlocks with JVMTI suspend mechanism. 3924 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter)) 3925 #if INCLUDE_JVMTI 3926 if (!DoJVMTIVirtualThreadTransitions) { 3927 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3928 return; 3929 } 3930 assert(thread->is_disable_suspend() != (bool)enter, 3931 "nested or unbalanced monitor enter/exit is not allowed"); 3932 thread->toggle_is_disable_suspend(); 3933 #endif 3934 JVM_END 3935 3936 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op)) 3937 #if INCLUDE_JFR 3938 freeze_result result = THREAD->last_freeze_fail_result(); 3939 assert(result != freeze_ok, "sanity check"); 3940 EventVirtualThreadPinned event(UNTIMED); 3941 event.set_starttime(THREAD->last_freeze_fail_time()); 3942 if (event.should_commit()) { 3943 ResourceMark rm(THREAD); 3944 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op)); 3945 THREAD->post_vthread_pinned_event(&event, str, result); 3946 } 3947 #endif 3948 JVM_END 3949 3950 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored)) 3951 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent(); 3952 assert(parkEvent != nullptr, "not initialized"); 3953 3954 OopHandle& list_head = ObjectMonitor::vthread_list_head(); 3955 oop vthread_head = nullptr; 3956 while (true) { 3957 if (list_head.peek() != nullptr) { 3958 for (;;) { 3959 oop head = list_head.resolve(); 3960 if (list_head.cmpxchg(head, nullptr) == head) { 3961 return JNIHandles::make_local(THREAD, head); 3962 } 3963 } 3964 } 3965 ThreadBlockInVM tbivm(THREAD); 3966 parkEvent->park(); 3967 } 3968 JVM_END 3969 3970 /* 3971 * Return the current class's class file version. The low order 16 bits of the 3972 * returned jint contain the class's major version. The high order 16 bits 3973 * contain the class's minor version. 3974 */ 3975 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 3976 oop mirror = JNIHandles::resolve_non_null(current); 3977 if (java_lang_Class::is_primitive(mirror)) { 3978 // return latest major version and minor version of 0. 3979 return JVM_CLASSFILE_MAJOR_VERSION; 3980 } 3981 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 3982 return (ik->minor_version() << 16) | ik->major_version(); 3983 JVM_END 3984 3985 /* 3986 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 3987 * get the value will see a materialized value and not a scalar-replaced 3988 * null value. 3989 */ 3990 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 3991 JVM_EnsureMaterializedForStackWalk(env, value); 3992 JVM_END 3993 3994 /* 3995 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded. 3996 */ 3997 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void)) 3998 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE; 3999 JVM_END --- EOF ---