1 /* 2 * Copyright (c) 1997, 2026, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "cds/aotClassInitializer.hpp" 26 #include "cds/aotMetaspace.hpp" 27 #include "cds/cdsConfig.hpp" 28 #include "cds/classListParser.hpp" 29 #include "cds/classListWriter.hpp" 30 #include "cds/dynamicArchive.hpp" 31 #include "cds/heapShared.hpp" 32 #include "cds/lambdaFormInvokers.hpp" 33 #include "cds/lambdaProxyClassDictionary.hpp" 34 #include "classfile/classFileStream.hpp" 35 #include "classfile/classLoader.inline.hpp" 36 #include "classfile/classLoaderData.inline.hpp" 37 #include "classfile/classLoadInfo.hpp" 38 #include "classfile/javaAssertions.hpp" 39 #include "classfile/javaClasses.inline.hpp" 40 #include "classfile/moduleEntry.hpp" 41 #include "classfile/modules.hpp" 42 #include "classfile/packageEntry.hpp" 43 #include "classfile/stringTable.hpp" 44 #include "classfile/symbolTable.hpp" 45 #include "classfile/systemDictionary.hpp" 46 #include "classfile/vmClasses.hpp" 47 #include "classfile/vmSymbols.hpp" 48 #include "gc/shared/collectedHeap.inline.hpp" 49 #include "interpreter/bytecode.hpp" 50 #include "interpreter/bytecodeUtils.hpp" 51 #include "jfr/jfrEvents.hpp" 52 #include "jvm.h" 53 #include "logging/log.hpp" 54 #include "memory/oopFactory.hpp" 55 #include "memory/referenceType.hpp" 56 #include "memory/resourceArea.hpp" 57 #include "memory/universe.hpp" 58 #include "oops/access.inline.hpp" 59 #include "oops/constantPool.hpp" 60 #include "oops/fieldStreams.inline.hpp" 61 #include "oops/flatArrayKlass.hpp" 62 #include "oops/inlineKlass.inline.hpp" 63 #include "oops/instanceKlass.hpp" 64 #include "oops/klass.inline.hpp" 65 #include "oops/method.hpp" 66 #include "oops/objArrayKlass.hpp" 67 #include "oops/objArrayOop.inline.hpp" 68 #include "oops/oop.inline.hpp" 69 #include "oops/oopCast.inline.hpp" 70 #include "oops/recordComponent.hpp" 71 #include "oops/refArrayOop.inline.hpp" 72 #include "oops/valuePayload.inline.hpp" 73 #include "prims/foreignGlobals.hpp" 74 #include "prims/jvm_misc.hpp" 75 #include "prims/jvmtiExport.hpp" 76 #include "prims/jvmtiThreadState.inline.hpp" 77 #include "prims/stackwalk.hpp" 78 #include "runtime/arguments.hpp" 79 #include "runtime/atomicAccess.hpp" 80 #include "runtime/continuation.hpp" 81 #include "runtime/deoptimization.hpp" 82 #include "runtime/globals_extension.hpp" 83 #include "runtime/handles.inline.hpp" 84 #include "runtime/handshake.hpp" 85 #include "runtime/init.hpp" 86 #include "runtime/interfaceSupport.inline.hpp" 87 #include "runtime/java.hpp" 88 #include "runtime/javaCalls.hpp" 89 #include "runtime/javaThread.hpp" 90 #include "runtime/jfieldIDWorkaround.hpp" 91 #include "runtime/jniHandles.inline.hpp" 92 #include "runtime/mountUnmountDisabler.hpp" 93 #include "runtime/os.inline.hpp" 94 #include "runtime/osThread.hpp" 95 #include "runtime/perfData.hpp" 96 #include "runtime/reflection.hpp" 97 #include "runtime/synchronizer.hpp" 98 #include "runtime/threadIdentifier.hpp" 99 #include "runtime/threadSMR.hpp" 100 #include "runtime/vframe.inline.hpp" 101 #include "runtime/vm_version.hpp" 102 #include "runtime/vmOperations.hpp" 103 #include "services/attachListener.hpp" 104 #include "services/management.hpp" 105 #include "services/threadService.hpp" 106 #include "utilities/checkedCast.hpp" 107 #include "utilities/copy.hpp" 108 #include "utilities/defaultStream.hpp" 109 #include "utilities/dtrace.hpp" 110 #include "utilities/events.hpp" 111 #include "utilities/macros.hpp" 112 #include "utilities/utf8.hpp" 113 #include "utilities/zipLibrary.hpp" 114 #if INCLUDE_CDS 115 #include "classfile/systemDictionaryShared.hpp" 116 #endif 117 #if INCLUDE_JFR 118 #include "jfr/jfr.hpp" 119 #endif 120 #if INCLUDE_MANAGEMENT 121 #include "services/finalizerService.hpp" 122 #endif 123 124 #include <errno.h> 125 126 /* 127 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 128 such ctors and calls MUST NOT come between an oop declaration/init and its 129 usage because if objects are move this may cause various memory stomps, bus 130 errors and segfaults. Here is a cookbook for causing so called "naked oop 131 failures": 132 133 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 134 // Object address to be held directly in mirror & not visible to GC 135 oop mirror = JNIHandles::resolve_non_null(ofClass); 136 137 // If this ctor can hit a safepoint, moving objects around, then 138 ComplexConstructor foo; 139 140 // Boom! mirror may point to JUNK instead of the intended object 141 (some dereference of mirror) 142 143 // Here's another call that may block for GC, making mirror stale 144 MutexLocker ml(some_lock); 145 146 // And here's an initializer that can result in a stale oop 147 // all in one step. 148 oop o = call_that_can_throw_exception(TRAPS); 149 150 151 The solution is to keep the oop declaration BELOW the ctor or function 152 call that might cause a GC, do another resolve to reassign the oop, or 153 consider use of a Handle instead of an oop so there is immunity from object 154 motion. But note that the "QUICK" entries below do not have a handlemark 155 and thus can only support use of handles passed in. 156 */ 157 158 extern void trace_class_resolution(Klass* to_class) { 159 ResourceMark rm; 160 int line_number = -1; 161 const char * source_file = nullptr; 162 const char * trace = "explicit"; 163 InstanceKlass* caller = nullptr; 164 JavaThread* jthread = JavaThread::current(); 165 if (jthread->has_last_Java_frame()) { 166 vframeStream vfst(jthread); 167 168 // Scan up the stack skipping ClassLoader frames. 169 Method* last_caller = nullptr; 170 171 while (!vfst.at_end()) { 172 Method* m = vfst.method(); 173 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) { 174 break; 175 } 176 last_caller = m; 177 vfst.next(); 178 } 179 // if this is called from Class.forName0 and that is called from Class.forName, 180 // then print the caller of Class.forName. If this is Class.loadClass, then print 181 // that caller, otherwise keep quiet since this should be picked up elsewhere. 182 bool found_it = false; 183 if (!vfst.at_end() && 184 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 185 vfst.method()->name() == vmSymbols::forName0_name()) { 186 vfst.next(); 187 if (!vfst.at_end() && 188 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 189 vfst.method()->name() == vmSymbols::forName_name()) { 190 vfst.next(); 191 found_it = true; 192 } 193 } else if (last_caller != nullptr && 194 last_caller->method_holder()->name() == 195 vmSymbols::java_lang_ClassLoader() && 196 last_caller->name() == vmSymbols::loadClass_name()) { 197 found_it = true; 198 } else if (!vfst.at_end()) { 199 if (vfst.method()->is_native()) { 200 // JNI call 201 found_it = true; 202 } 203 } 204 if (found_it && !vfst.at_end()) { 205 // found the caller 206 caller = vfst.method()->method_holder(); 207 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 208 if (line_number == -1) { 209 // show method name if it's a native method 210 trace = vfst.method()->name_and_sig_as_C_string(); 211 } 212 Symbol* s = caller->source_file_name(); 213 if (s != nullptr) { 214 source_file = s->as_C_string(); 215 } 216 } 217 } 218 if (caller != nullptr) { 219 if (to_class != caller) { 220 const char * from = caller->external_name(); 221 const char * to = to_class->external_name(); 222 // print in a single call to reduce interleaving between threads 223 if (source_file != nullptr) { 224 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 225 } else { 226 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 227 } 228 } 229 } 230 } 231 232 // java.lang.System ////////////////////////////////////////////////////////////////////// 233 234 JVM_ENTRY(jboolean, JVM_AOTEndRecording(JNIEnv *env)) 235 #if INCLUDE_CDS 236 if (CDSConfig::is_dumping_preimage_static_archive()) { 237 if (!AOTMetaspace::preimage_static_archive_dumped()) { 238 AOTMetaspace::dump_static_archive(THREAD); 239 return JNI_TRUE; 240 } 241 } 242 return JNI_FALSE; 243 #else 244 return JNI_FALSE; 245 #endif // INCLUDE_CDS 246 JVM_END 247 248 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 249 return os::javaTimeMillis(); 250 JVM_END 251 252 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 253 return os::javaTimeNanos(); 254 JVM_END 255 256 // The function below is actually exposed by jdk.internal.misc.VM and not 257 // java.lang.System, but we choose to keep it here so that it stays next 258 // to JVM_CurrentTimeMillis and JVM_NanoTime 259 260 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 261 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 262 263 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 264 jlong seconds; 265 jlong nanos; 266 267 os::javaTimeSystemUTC(seconds, nanos); 268 269 // We're going to verify that the result can fit in a long. 270 // For that we need the difference in seconds between 'seconds' 271 // and 'offset_secs' to be such that: 272 // |seconds - offset_secs| < (2^63/10^9) 273 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 274 // which makes |seconds - offset_secs| < 2^33 275 // and we will prefer +/- 2^32 as the maximum acceptable diff 276 // as 2^32 has a more natural feel than 2^33... 277 // 278 // So if |seconds - offset_secs| >= 2^32 - we return a special 279 // sentinel value (-1) which the caller should take as an 280 // exception value indicating that the offset given to us is 281 // too far from range of the current time - leading to too big 282 // a nano adjustment. The caller is expected to recover by 283 // computing a more accurate offset and calling this method 284 // again. (For the record 2^32 secs is ~136 years, so that 285 // should rarely happen) 286 // 287 jlong diff = seconds - offset_secs; 288 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 289 return -1; // sentinel value: the offset is too far off the target 290 } 291 292 // return the adjustment. If you compute a time by adding 293 // this number of nanoseconds along with the number of seconds 294 // in the offset you should get the current UTC time. 295 return (diff * (jlong)1000000000) + nanos; 296 JVM_END 297 298 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 299 jobject dst, jint dst_pos, jint length)) 300 // Check if we have null pointers 301 if (src == nullptr || dst == nullptr) { 302 THROW(vmSymbols::java_lang_NullPointerException()); 303 } 304 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 305 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 306 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 307 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 308 // Do copy 309 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 310 JVM_END 311 312 313 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 314 JavaValue r(T_OBJECT); 315 // public synchronized Object put(Object key, Object value); 316 HandleMark hm(THREAD); 317 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 318 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK); 319 JavaCalls::call_virtual(&r, 320 props, 321 vmClasses::Properties_klass(), 322 vmSymbols::put_name(), 323 vmSymbols::object_object_object_signature(), 324 key_str, 325 value_str, 326 THREAD); 327 } 328 329 330 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 331 332 /* 333 * Return all of the system properties in a Java String array with alternating 334 * names and values from the jvm SystemProperty. 335 * Which includes some internal and all commandline -D defined properties. 336 */ 337 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 338 ResourceMark rm(THREAD); 339 HandleMark hm(THREAD); 340 int ndx = 0; 341 int fixedCount = 2; 342 343 SystemProperty* p = Arguments::system_properties(); 344 int count = Arguments::PropertyList_count(p); 345 346 // Allocate result String array 347 InstanceKlass* ik = vmClasses::String_klass(); 348 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 349 objArrayHandle result_h(THREAD, r); 350 351 while (p != nullptr) { 352 const char * key = p->key(); 353 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 354 const char * value = p->value(); 355 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 356 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL); 357 result_h->obj_at_put(ndx * 2, key_str()); 358 result_h->obj_at_put(ndx * 2 + 1, value_str()); 359 ndx++; 360 } 361 p = p->next(); 362 } 363 364 // Convert the -XX:MaxDirectMemorySize= command line flag 365 // to the sun.nio.MaxDirectMemorySize property. 366 // Do this after setting user properties to prevent people 367 // from setting the value with a -D option, as requested. 368 // Leave empty if not supplied 369 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 370 char as_chars[256]; 371 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 372 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 373 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 374 result_h->obj_at_put(ndx * 2, key_str()); 375 result_h->obj_at_put(ndx * 2 + 1, value_str()); 376 ndx++; 377 } 378 379 // JVM monitoring and management support 380 // Add the sun.management.compiler property for the compiler's name 381 { 382 #undef CSIZE 383 #if defined(_LP64) 384 #define CSIZE "64-Bit " 385 #else 386 #define CSIZE 387 #endif // 64bit 388 389 #if COMPILER1_AND_COMPILER2 390 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 391 #else 392 #if defined(COMPILER1) 393 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 394 #elif defined(COMPILER2) 395 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 396 #else 397 const char* compiler_name = ""; 398 #endif // compilers 399 #endif // COMPILER1_AND_COMPILER2 400 401 if (*compiler_name != '\0' && 402 (Arguments::mode() != Arguments::_int)) { 403 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 404 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 405 result_h->obj_at_put(ndx * 2, key_str()); 406 result_h->obj_at_put(ndx * 2 + 1, value_str()); 407 ndx++; 408 } 409 } 410 411 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 412 JVM_END 413 414 415 /* 416 * Return the temporary directory that the VM uses for the attach 417 * and perf data files. 418 * 419 * It is important that this directory is well-known and the 420 * same for all VM instances. It cannot be affected by configuration 421 * variables such as java.io.tmpdir. 422 */ 423 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 424 HandleMark hm(THREAD); 425 const char* temp_dir = os::get_temp_directory(); 426 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 427 return (jstring) JNIHandles::make_local(THREAD, h()); 428 JVM_END 429 430 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to)) 431 oop o = JNIHandles::resolve_non_null(orig); 432 assert(o->is_array(), "Must be"); 433 oop array = nullptr; 434 arrayOop org = (arrayOop)o; 435 arrayHandle oh(THREAD, org); 436 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass()); 437 InlineKlass* vk = InlineKlass::cast(ak->element_klass()); 438 int len = to - from; // length of the new array 439 if (ak->is_null_free_array_klass()) { 440 if ((len != 0) && (from >= org->length() || to > org->length())) { 441 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements"); 442 } 443 } 444 if (ak->is_flatArray_klass()) { 445 // The whole JVM_CopyOfSpecialArray is currently broken. Fix this in a separate bugfix. 446 int org_length = org->length(); 447 int copy_len = MIN2(to, org_length) - MIN2(from, org_length); 448 FlatArrayKlass* const fak = FlatArrayKlass::cast(org->klass()); 449 flatArrayOop dst = fak->allocate_instance(len, CHECK_NULL); 450 assert(!ak->is_null_free_array_klass() || copy_len == len, 451 "Failed to throw the IllegalArgumentException"); 452 if (copy_len != 0) { 453 int start = MIN2(from, org_length - 1); 454 FlatArrayPayload src_payload(flatArrayOop(oh()), start, fak); 455 FlatArrayPayload dst_payload(dst, 0, fak); 456 int end = to < oh()->length() ? to : oh()->length(); 457 for (int i = from; i < end; i++) { 458 // Copy a value 459 src_payload.copy_to(dst_payload); 460 461 // Advance to the next element 462 src_payload.next_element(); 463 dst_payload.next_element(); 464 } 465 } 466 array = dst; 467 } else { 468 const ArrayProperties props = ArrayProperties::Default().with_null_restricted(ak->is_null_free_array_klass()); 469 470 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL); 471 int end = to < oh()->length() ? to : oh()->length(); 472 for (int i = from; i < end; i++) { 473 if (i < ((objArrayOop)oh())->length()) { 474 oop val = ((objArrayOop)oh())->obj_at(i, CHECK_NULL); 475 ((objArrayOop)array)->obj_at_put(i - from, val); 476 } else { 477 assert(!ak->is_null_free_array_klass(), "Must be a nullable array"); 478 ((objArrayOop)array)->obj_at_put(i - from, nullptr); 479 } 480 } 481 } 482 return (jarray) JNIHandles::make_local(THREAD, array); 483 JVM_END 484 485 #ifdef ASSERT 486 static void verify_array_arguments(jclass elmClass, jint len) { 487 assert(len >= 0, "Negative array length"); 488 assert(elmClass != nullptr, "Null element class"); 489 oop mirror = JNIHandles::resolve_non_null(elmClass); 490 Klass* klass = java_lang_Class::as_Klass(mirror); 491 assert(klass->is_inline_klass(), "Element class must be an inline class"); 492 } 493 #endif // ASSERT 494 495 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal)) 496 DEBUG_ONLY(verify_array_arguments(elmClass, len)); 497 oop mirror = JNIHandles::resolve_non_null(elmClass); 498 Klass* klass = java_lang_Class::as_Klass(mirror); 499 oop init = JNIHandles::resolve_non_null(initVal); 500 Handle init_h(THREAD, init); 501 assert(klass == init_h()->klass(), "Type mismatch between array and initial value"); 502 const ArrayProperties props = ArrayProperties::Default() 503 .with_null_restricted() 504 .with_non_atomic(); 505 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL); 506 for (int i = 0; i < len; i++) { 507 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ ); 508 } 509 return (jarray) JNIHandles::make_local(THREAD, array); 510 JVM_END 511 512 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal)) 513 DEBUG_ONLY(verify_array_arguments(elmClass, len);) 514 oop mirror = JNIHandles::resolve_non_null(elmClass); 515 Klass* klass = java_lang_Class::as_Klass(mirror); 516 oop init = JNIHandles::resolve_non_null(initVal); 517 Handle init_h(THREAD, init); 518 assert(klass == init_h()->klass(), "Type mismatch between array and initial value"); 519 const ArrayProperties props = ArrayProperties::Default().with_null_restricted(); 520 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL); 521 for (int i = 0; i < len; i++) { 522 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ ); 523 } 524 return (jarray) JNIHandles::make_local(THREAD, array); 525 JVM_END 526 527 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len)) 528 DEBUG_ONLY(verify_array_arguments(elmClass, len);) 529 oop mirror = JNIHandles::resolve_non_null(elmClass); 530 Klass* klass = java_lang_Class::as_Klass(mirror); 531 objArrayOop array = oopFactory::new_objArray(klass, len, ArrayProperties::Default(), CHECK_NULL); 532 return (jarray) JNIHandles::make_local(THREAD, array); 533 JVM_END 534 535 JVM_ENTRY(jarray, JVM_NewReferenceArray(JNIEnv *env, jclass elmClass, jint len)) 536 DEBUG_ONLY(verify_array_arguments(elmClass, len);) 537 oop mirror = JNIHandles::resolve_non_null(elmClass); 538 Klass* klass = java_lang_Class::as_Klass(mirror); 539 refArrayOop array = oopFactory::new_refArray(klass, len, ArrayProperties::Default(), CHECK_NULL); 540 return (jarray) JNIHandles::make_local(THREAD, array); 541 JVM_END 542 543 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jarray array)) 544 oop o = JNIHandles::resolve_non_null(array); 545 Klass* klass = o->klass(); 546 547 assert(klass->is_objArray_klass(), "Expects an object array"); 548 549 return klass->is_flatArray_klass(); 550 JVM_END 551 552 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jarray array)) 553 oop o = JNIHandles::resolve_non_null(array); 554 Klass* klass = o->klass(); 555 556 assert(klass->is_objArray_klass(), "Expects an object array"); 557 558 return klass->is_null_free_array_klass(); 559 JVM_END 560 561 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jarray array)) 562 // There are multiple cases where an array can/must support atomic access: 563 // - the array is a reference array 564 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or NULL_FREE_ATOMIC_FLAT 565 // - the array is flat and its component type is naturally atomic 566 oop o = JNIHandles::resolve_non_null(array); 567 Klass* klass = o->klass(); 568 569 assert(klass->is_objArray_klass(), "Expects an object array"); 570 571 if (klass->is_refArray_klass()) { 572 return true; 573 } 574 575 if (klass->is_flatArray_klass()) { 576 FlatArrayKlass* fak = FlatArrayKlass::cast(klass); 577 if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) { 578 return true; 579 } 580 bool is_null_free = !LayoutKindHelper::is_nullable_flat(fak->layout_kind()); 581 if (fak->element_klass()->is_naturally_atomic(is_null_free)) { 582 return true; 583 } 584 585 return false; 586 } 587 588 ShouldNotReachHere(); 589 JVM_END 590 591 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 592 593 extern volatile jint vm_created; 594 595 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 596 EventShutdown event; 597 if (event.should_commit()) { 598 event.set_reason("Shutdown requested from Java"); 599 event.commit(); 600 } 601 JVM_END 602 603 604 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 605 before_exit(thread, true); 606 vm_exit(code); 607 JVM_END 608 609 610 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 611 if (!DisableExplicitGC) { 612 EventSystemGC event; 613 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent); 614 Universe::heap()->collect(GCCause::_java_lang_system_gc); 615 event.commit(); 616 } 617 JVM_END 618 619 620 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 621 return Universe::heap()->millis_since_last_whole_heap_examined(); 622 JVM_END 623 624 625 static inline jlong convert_size_t_to_jlong(size_t val) { 626 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 627 NOT_LP64 (return (jlong)val;) 628 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 629 } 630 631 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 632 size_t n = Universe::heap()->capacity(); 633 return convert_size_t_to_jlong(n); 634 JVM_END 635 636 637 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 638 size_t n = Universe::heap()->unused(); 639 return convert_size_t_to_jlong(n); 640 JVM_END 641 642 643 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 644 size_t n = Universe::heap()->max_capacity(); 645 return convert_size_t_to_jlong(n); 646 JVM_END 647 648 649 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 650 return os::active_processor_count(); 651 JVM_END 652 653 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void)) 654 #ifdef LINUX 655 if (UseContainerSupport) { 656 return JNI_TRUE; 657 } 658 #endif 659 return JNI_FALSE; 660 JVM_END 661 662 JVM_LEAF(jboolean, JVM_IsContainerized(void)) 663 if (os::is_containerized()) { 664 return JNI_TRUE; 665 } 666 return JNI_FALSE; 667 JVM_END 668 669 // java.lang.Throwable ////////////////////////////////////////////////////// 670 671 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 672 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 673 java_lang_Throwable::fill_in_stack_trace(exception); 674 JVM_END 675 676 // java.lang.NullPointerException /////////////////////////////////////////// 677 678 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 679 if (!ShowCodeDetailsInExceptionMessages) return nullptr; 680 681 oop exc = JNIHandles::resolve_non_null(throwable); 682 683 Method* method; 684 int bci; 685 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 686 return nullptr; 687 } 688 if (method->is_native()) { 689 return nullptr; 690 } 691 692 stringStream ss; 693 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 694 if (ok) { 695 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 696 return (jstring) JNIHandles::make_local(THREAD, result); 697 } else { 698 return nullptr; 699 } 700 JVM_END 701 702 // java.lang.StackTraceElement ////////////////////////////////////////////// 703 704 705 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth)) 706 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace)); 707 refArrayOop st = refArrayOop(JNIHandles::resolve(elements)); 708 refArrayHandle stack_trace(THREAD, st); 709 // Fill in the allocated stack trace 710 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK); 711 JVM_END 712 713 714 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 715 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 716 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 717 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK); 718 JVM_END 719 720 721 // java.lang.StackWalker ////////////////////////////////////////////////////// 722 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj)) 723 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj)); 724 725 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr); 726 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr); 727 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info()); 728 if (!have_name) { 729 oop name = StringTable::intern(method->name(), CHECK); 730 java_lang_StackFrameInfo::set_name(stack_frame_info(), name); 731 } 732 if (!have_type) { 733 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK); 734 java_lang_StackFrameInfo::set_type(stack_frame_info(), type()); 735 } 736 JVM_END 737 738 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode, 739 jint skip_frames, jobject contScope, jobject cont, 740 jint buffer_size, jint start_index, jobjectArray frames)) 741 if (!thread->has_last_Java_frame()) { 742 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr); 743 } 744 745 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 746 Handle contScope_h(THREAD, JNIHandles::resolve(contScope)); 747 Handle cont_h(THREAD, JNIHandles::resolve(cont)); 748 // frames array is a ClassFrameInfo[] array when only getting caller reference, 749 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 750 // be null. 751 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames)); 752 refArrayHandle frames_array_h(THREAD, fa); 753 754 if (frames_array_h->length() < buffer_size) { 755 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr); 756 } 757 758 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h, 759 buffer_size, start_index, frames_array_h, CHECK_NULL); 760 return JNIHandles::make_local(THREAD, result); 761 JVM_END 762 763 764 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor, 765 jint last_batch_count, jint buffer_size, jint start_index, 766 jobjectArray frames)) 767 // frames array is a ClassFrameInfo[] array when only getting caller reference, 768 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 769 // be null. 770 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames)); 771 refArrayHandle frames_array_h(THREAD, fa); 772 773 if (frames_array_h->length() < buffer_size) { 774 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 775 } 776 777 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 778 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size, 779 start_index, frames_array_h, THREAD); 780 JVM_END 781 782 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont)) 783 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames)); 784 refArrayHandle frames_array_h(THREAD, fa); 785 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 786 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont)); 787 788 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD); 789 JVM_END 790 791 // java.lang.Object /////////////////////////////////////////////// 792 793 794 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 795 // as implemented in the classic virtual machine; return 0 if object is null 796 if (handle == nullptr) { 797 return 0; 798 } 799 oop obj = JNIHandles::resolve_non_null(handle); 800 if (Arguments::is_valhalla_enabled() && obj->klass()->is_inline_klass()) { 801 const intptr_t obj_identity_hash = obj->mark().hash(); 802 // Check if mark word contains hash code already. 803 // It is possible that the generated identity hash is 0, which is not 804 // distinct from the no_hash value. In such a case, the hash will be 805 // computed and set every time JVM_IHashCode is called. If that happens, 806 // the only consequence is losing out on the optimization. 807 if (obj_identity_hash != markWord::no_hash) { 808 return checked_cast<jint>(obj_identity_hash); 809 } 810 811 // Compute hash by calling ValueObjectMethods.valueObjectHashCode. 812 // The identity hash is invariantly immutable (see its JavaDoc comment). 813 JavaValue result(T_INT); 814 JavaCallArguments args; 815 Handle ho(THREAD, obj); 816 args.push_oop(ho); 817 methodHandle method(THREAD, Universe::value_object_hash_code_method()); 818 JavaCalls::call(&result, method, &args, THREAD); 819 Exceptions::wrap_exception_in_internal_error("Internal error in hashCode", CHECK_0); 820 821 const intptr_t identity_hash = result.get_jint(); 822 823 // We now have to set the hash via CAS. It's possible that this will race 824 // other threads. By our invariant of immutability, when there is a 825 // race, the identity hash code is going to be one of the following: 826 // a) 0, another thread updated other markWord bits; b) identity_hash set 827 // by another thread; or c) identity_hash set by the current thread. 828 // A nonzero identity hash code that is not the identity_hash computed 829 // earlier indicates a violation of the invariant. 830 markWord current_mark, old_mark, new_mark; 831 do { 832 current_mark = ho->mark(); 833 new_mark = current_mark.copy_set_hash(identity_hash); 834 old_mark = ho->cas_set_mark(new_mark, current_mark); 835 assert(old_mark.has_no_hash() || old_mark.hash() == new_mark.hash(), 836 "CAS identity hash invariant violated, expected=" INTPTR_FORMAT " actual=" INTPTR_FORMAT, 837 new_mark.hash(), 838 old_mark.hash()); 839 } while (old_mark != current_mark); 840 841 return checked_cast<jint>(new_mark.hash()); 842 } else { 843 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj)); 844 } 845 JVM_END 846 847 848 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 849 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 850 ObjectSynchronizer::wait(obj, ms, CHECK); 851 JVM_END 852 853 854 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 855 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 856 ObjectSynchronizer::notify(obj, CHECK); 857 JVM_END 858 859 860 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 861 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 862 ObjectSynchronizer::notifyall(obj, CHECK); 863 JVM_END 864 865 866 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 867 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 868 Klass* klass = obj->klass(); 869 JvmtiVMObjectAllocEventCollector oam; 870 871 #ifdef ASSERT 872 // Just checking that the cloneable flag is set correct 873 if (obj->is_array()) { 874 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 875 } else { 876 guarantee(obj->is_instance(), "should be instanceOop"); 877 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 878 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 879 } 880 #endif 881 882 // Check if class of obj supports the Cloneable interface. 883 // All arrays are considered to be cloneable (See JLS 20.1.5). 884 // All j.l.r.Reference classes are considered non-cloneable. 885 if (!klass->is_cloneable() || 886 (klass->is_instance_klass() && 887 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 888 ResourceMark rm(THREAD); 889 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 890 } 891 892 if (klass->is_inline_klass()) { 893 // Value instances have no identity, so return the current instance instead of allocating a new one 894 // Value classes cannot have finalizers, so the method can return immediately 895 return JNIHandles::make_local(THREAD, obj()); 896 } 897 898 // Make shallow object copy 899 const size_t size = obj->size(); 900 oop new_obj_oop = nullptr; 901 if (obj->is_array()) { 902 const int length = ((arrayOop)obj())->length(); 903 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 904 /* do_zero */ true, CHECK_NULL); 905 } else { 906 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 907 } 908 909 HeapAccess<>::clone(obj(), new_obj_oop, size); 910 911 Handle new_obj(THREAD, new_obj_oop); 912 // Caution: this involves a java upcall, so the clone should be 913 // "gc-robust" by this stage. 914 if (klass->has_finalizer()) { 915 assert(obj->is_instance(), "should be instanceOop"); 916 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 917 new_obj = Handle(THREAD, new_obj_oop); 918 } 919 920 return JNIHandles::make_local(THREAD, new_obj()); 921 JVM_END 922 923 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 924 925 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 926 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 927 JVM_END 928 929 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 930 return InstanceKlass::is_finalization_enabled(); 931 JVM_END 932 933 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 934 935 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 936 CONT_RegisterNativeMethods(env, cls); 937 JVM_END 938 939 // java.io.File /////////////////////////////////////////////////////////////// 940 941 JVM_LEAF(char*, JVM_NativePath(char* path)) 942 return os::native_path(path); 943 JVM_END 944 945 946 // Misc. class handling /////////////////////////////////////////////////////////// 947 948 949 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 950 // Getting the class of the caller frame. 951 // 952 // The call stack at this point looks something like this: 953 // 954 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ] 955 // [1] [ @CallerSensitive API.method ] 956 // [.] [ (skipped intermediate frames) ] 957 // [n] [ caller ] 958 vframeStream vfst(thread); 959 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 960 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 961 Method* m = vfst.method(); 962 assert(m != nullptr, "sanity"); 963 switch (n) { 964 case 0: 965 // This must only be called from Reflection.getCallerClass 966 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 967 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 968 } 969 // fall-through 970 case 1: 971 // Frame 0 and 1 must be caller sensitive. 972 if (!m->caller_sensitive()) { 973 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 974 } 975 break; 976 default: 977 if (!m->is_ignored_by_security_stack_walk()) { 978 // We have reached the desired frame; return the holder class. 979 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 980 } 981 break; 982 } 983 } 984 return nullptr; 985 JVM_END 986 987 988 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 989 oop mirror = nullptr; 990 BasicType t = name2type(utf); 991 if (t != T_ILLEGAL && !is_reference_type(t)) { 992 mirror = Universe::java_mirror(t); 993 } 994 if (mirror == nullptr) { 995 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 996 } else { 997 return (jclass) JNIHandles::make_local(THREAD, mirror); 998 } 999 JVM_END 1000 1001 1002 // Returns a class loaded by the bootstrap class loader; or null 1003 // if not found. ClassNotFoundException is not thrown. 1004 // FindClassFromBootLoader is exported to the launcher for windows. 1005 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 1006 const char* name)) 1007 // Java libraries should ensure that name is never null or illegal. 1008 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 1009 // It's impossible to create this class; the name cannot fit 1010 // into the constant pool. 1011 return nullptr; 1012 } 1013 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name"); 1014 1015 TempNewSymbol h_name = SymbolTable::new_symbol(name); 1016 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 1017 if (k == nullptr) { 1018 return nullptr; 1019 } 1020 1021 if (log_is_enabled(Debug, class, resolve)) { 1022 trace_class_resolution(k); 1023 } 1024 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1025 JVM_END 1026 1027 // Find a class with this name in this loader. 1028 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name, 1029 jboolean init, jobject loader)) 1030 TempNewSymbol h_name = 1031 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 1032 CHECK_NULL); 1033 1034 oop loader_oop = JNIHandles::resolve(loader); 1035 Handle h_loader(THREAD, loader_oop); 1036 1037 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 1038 false, THREAD); 1039 1040 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1041 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 1042 } 1043 return result; 1044 JVM_END 1045 1046 // Currently only called from the old verifier. 1047 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 1048 jboolean init, jclass from)) 1049 TempNewSymbol h_name = 1050 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 1051 CHECK_NULL); 1052 oop from_class_oop = JNIHandles::resolve(from); 1053 assert(from_class_oop != nullptr, "must be"); 1054 Klass* from_class = java_lang_Class::as_Klass(from_class_oop); 1055 assert(from_class != nullptr, "must be"); 1056 oop class_loader = from_class->class_loader(); 1057 1058 Handle h_loader(THREAD, class_loader); 1059 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread); 1060 1061 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1062 // this function is generally only used for class loading during verification. 1063 ResourceMark rm; 1064 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name(); 1065 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name(); 1066 log_debug(class, resolve)("%s %s (verification)", from_name, to_name); 1067 } 1068 1069 #if INCLUDE_CDS 1070 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) { 1071 InstanceKlass* ik = InstanceKlass::cast(from_class); 1072 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name); 1073 } 1074 #endif 1075 1076 return result; 1077 JVM_END 1078 1079 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 1080 static jclass jvm_define_class_common(const char *name, 1081 jobject loader, const jbyte *buf, 1082 jsize len, jobject pd, const char *source, 1083 TRAPS) { 1084 if (source == nullptr) source = "__JVM_DefineClass__"; 1085 1086 JavaThread* jt = THREAD; 1087 1088 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 1089 ClassLoader::perf_define_appclass_selftime(), 1090 ClassLoader::perf_define_appclasses(), 1091 jt->get_thread_stat()->perf_recursion_counts_addr(), 1092 jt->get_thread_stat()->perf_timers_addr(), 1093 PerfClassTraceTime::DEFINE_CLASS); 1094 1095 if (UsePerfData) { 1096 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 1097 } 1098 1099 // Class resolution will get the class name from the .class stream if the name is null. 1100 TempNewSymbol class_name = name == nullptr ? nullptr : 1101 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1102 CHECK_NULL); 1103 1104 ResourceMark rm(THREAD); 1105 ClassFileStream st((u1*)buf, len, source); 1106 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 1107 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1108 ClassLoadInfo cl_info(protection_domain); 1109 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 1110 class_loader, 1111 cl_info, 1112 CHECK_NULL); 1113 1114 if (log_is_enabled(Debug, class, resolve)) { 1115 trace_class_resolution(k); 1116 } 1117 1118 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1119 } 1120 1121 enum { 1122 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 1123 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 1124 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 1125 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 1126 }; 1127 1128 /* 1129 * Define a class with the specified flags that indicates if it's a nestmate, 1130 * hidden, or strongly referenced from class loader. 1131 */ 1132 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 1133 const jbyte *buf, jsize len, jobject pd, 1134 jboolean init, int flags, jobject classData, TRAPS) { 1135 ResourceMark rm(THREAD); 1136 1137 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup)); 1138 // Lookup class must not be a primitive class (whose mirror has a null Klass*) 1139 if (lookup_k == nullptr) { 1140 // The error message is wrong. We come here only if lookup is a primitive class 1141 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1142 } 1143 1144 Handle class_loader (THREAD, lookup_k->class_loader()); 1145 1146 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 1147 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1148 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1149 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1150 1151 InstanceKlass* host_class = nullptr; 1152 if (is_nestmate) { 1153 host_class = lookup_k->nest_host(CHECK_NULL); 1154 } 1155 1156 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1157 name, 1158 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1159 is_nestmate ? host_class->external_name() : "", 1160 is_hidden ? "hidden" : "not hidden", 1161 is_strong ? "strong" : "weak", 1162 vm_annotations ? "with vm annotations" : "without vm annotation"); 1163 1164 if (!is_hidden) { 1165 // classData is only applicable for hidden classes 1166 if (classData != nullptr) { 1167 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1168 } 1169 if (is_nestmate) { 1170 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1171 } 1172 if (!is_strong) { 1173 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1174 } 1175 if (vm_annotations) { 1176 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1177 } 1178 if (flags != STRONG_LOADER_LINK) { 1179 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1180 err_msg("invalid flag 0x%x", flags)); 1181 } 1182 } 1183 1184 // Class resolution will get the class name from the .class stream if the name is null. 1185 TempNewSymbol class_name = name == nullptr ? nullptr : 1186 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1187 CHECK_NULL); 1188 1189 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1190 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1191 ClassFileStream st((u1*)buf, len, source); 1192 1193 InstanceKlass* ik = nullptr; 1194 if (!is_hidden) { 1195 ClassLoadInfo cl_info(protection_domain); 1196 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1197 class_loader, 1198 cl_info, 1199 CHECK_NULL); 1200 1201 if (log_is_enabled(Debug, class, resolve)) { 1202 trace_class_resolution(ik); 1203 } 1204 } else { // hidden 1205 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1206 ClassLoadInfo cl_info(protection_domain, 1207 host_class, 1208 classData_h, 1209 is_hidden, 1210 is_strong, 1211 vm_annotations); 1212 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1213 class_loader, 1214 cl_info, 1215 CHECK_NULL); 1216 1217 // The hidden class loader data has been artificially been kept alive to 1218 // this point. The mirror and any instances of this class have to keep 1219 // it alive afterwards. 1220 ik->class_loader_data()->dec_keep_alive_ref_count(); 1221 1222 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1223 ModuleEntry* module = ik->module(); 1224 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1225 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1226 module_name, 1227 ik->external_name(), 1228 host_class->external_name(), 1229 ik->is_hidden() ? "is hidden" : "is not hidden"); 1230 } 1231 } 1232 1233 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) { 1234 // non-hidden class or nestmate class must be in the same package as the Lookup class 1235 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages"); 1236 } 1237 1238 if (init) { 1239 ik->initialize(CHECK_NULL); 1240 } else { 1241 ik->link_class(CHECK_NULL); 1242 } 1243 1244 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1245 } 1246 1247 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1248 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1249 JVM_END 1250 1251 /* 1252 * Define a class with the specified lookup class. 1253 * lookup: Lookup class 1254 * name: the name of the class 1255 * buf: class bytes 1256 * len: length of class bytes 1257 * pd: protection domain 1258 * init: initialize the class 1259 * flags: properties of the class 1260 * classData: private static pre-initialized field 1261 */ 1262 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1263 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1264 1265 if (lookup == nullptr) { 1266 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1267 } 1268 1269 assert(buf != nullptr, "buf must not be null"); 1270 1271 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1272 JVM_END 1273 1274 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1275 1276 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1277 JVM_END 1278 1279 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1280 ResourceMark rm(THREAD); 1281 1282 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1283 char* str = java_lang_String::as_utf8_string(h_name()); 1284 1285 // Sanity check, don't expect null 1286 if (str == nullptr) return nullptr; 1287 1288 // Internalize the string, converting '.' to '/' in string. 1289 char* p = (char*)str; 1290 while (*p != '\0') { 1291 if (*p == '.') { 1292 *p = '/'; 1293 } 1294 p++; 1295 } 1296 1297 const int str_len = (int)(p - str); 1298 if (str_len > Symbol::max_length()) { 1299 // It's impossible to create this class; the name cannot fit 1300 // into the constant pool. 1301 return nullptr; 1302 } 1303 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1304 1305 // Security Note: 1306 // The Java level wrapper will perform the necessary security check allowing 1307 // us to pass the null as the initiating class loader. 1308 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1309 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader); 1310 #if INCLUDE_CDS 1311 if (k == nullptr) { 1312 // If the class is not already loaded, try to see if it's in the shared 1313 // archive for the current classloader (h_loader). 1314 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1315 } 1316 #endif 1317 return (k == nullptr) ? nullptr : 1318 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1319 JVM_END 1320 1321 // Module support ////////////////////////////////////////////////////////////////////////////// 1322 1323 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1324 jstring location, jobjectArray packages)) 1325 Handle h_module (THREAD, JNIHandles::resolve(module)); 1326 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1327 JVM_END 1328 1329 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1330 Handle h_module (THREAD, JNIHandles::resolve(module)); 1331 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1332 JVM_END 1333 1334 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1335 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1336 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1337 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1338 JVM_END 1339 1340 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1341 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1342 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1343 JVM_END 1344 1345 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1346 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1347 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1348 JVM_END 1349 1350 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1351 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1352 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1353 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1354 JVM_END 1355 1356 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1357 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1358 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1359 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1360 JVM_END 1361 1362 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1363 1364 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1365 assert (cls != nullptr, "illegal class"); 1366 JvmtiVMObjectAllocEventCollector oam; 1367 ResourceMark rm(THREAD); 1368 HandleMark hm(THREAD); 1369 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1370 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1371 return (jstring) JNIHandles::make_local(THREAD, result); 1372 JVM_END 1373 1374 1375 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1376 JvmtiVMObjectAllocEventCollector oam; 1377 oop mirror = JNIHandles::resolve_non_null(cls); 1378 1379 // Special handling for primitive objects 1380 if (java_lang_Class::is_primitive(mirror)) { 1381 // Primitive objects does not have any interfaces 1382 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1383 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1384 } 1385 1386 Klass* klass = java_lang_Class::as_Klass(mirror); 1387 // Figure size of result array 1388 int size; 1389 if (klass->is_instance_klass()) { 1390 InstanceKlass* ik = InstanceKlass::cast(klass); 1391 size = ik->local_interfaces()->length(); 1392 } else { 1393 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1394 size = 2; 1395 } 1396 1397 // Allocate result array 1398 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1399 objArrayHandle result (THREAD, r); 1400 // Fill in result 1401 if (klass->is_instance_klass()) { 1402 // Regular instance klass, fill in all local interfaces 1403 for (int index = 0; index < size; index++) { 1404 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1405 result->obj_at_put(index, k->java_mirror()); 1406 } 1407 } else { 1408 // All arrays implement java.lang.Cloneable and java.io.Serializable 1409 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1410 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1411 } 1412 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1413 JVM_END 1414 1415 1416 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1417 oop mirror = JNIHandles::resolve_non_null(cls); 1418 if (java_lang_Class::is_primitive(mirror)) { 1419 return JNI_FALSE; 1420 } 1421 Klass* k = java_lang_Class::as_Klass(mirror); 1422 return k->is_hidden(); 1423 JVM_END 1424 1425 1426 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1427 ResourceMark rm(THREAD); 1428 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1429 JvmtiVMObjectAllocEventCollector oam; 1430 1431 // Iterate through Java frames 1432 vframeStream vfst(thread); 1433 for(; !vfst.at_end(); vfst.next()) { 1434 int loc = -1; 1435 // get method of frame 1436 Method* method = vfst.method(); 1437 1438 Symbol *name = method->name(); 1439 1440 InstanceKlass* holder = method->method_holder(); 1441 if (name == vmSymbols::runWith_method_name()) { 1442 if (holder == vmClasses::Thread_klass() 1443 || holder == vmClasses::ScopedValue_Carrier_klass()) { 1444 loc = 1; 1445 } 1446 } 1447 1448 if (loc != -1) { 1449 javaVFrame *frame = vfst.asJavaVFrame(); 1450 StackValueCollection* locals = frame->locals(); 1451 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot 1452 Handle result = head_sv->get_obj(); 1453 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1454 if (result() != nullptr) { 1455 return JNIHandles::make_local(THREAD, result()); 1456 } 1457 } 1458 } 1459 1460 return nullptr; 1461 JVM_END 1462 1463 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1464 JvmtiVMObjectAllocEventCollector oam; 1465 // ofClass is a reference to a java_lang_Class object. The mirror object 1466 // of an InstanceKlass 1467 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1468 if (java_lang_Class::is_primitive(ofMirror) || 1469 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1470 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1471 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1472 } 1473 1474 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1475 InnerClassesIterator iter(k); 1476 1477 if (iter.length() == 0) { 1478 // Neither an inner nor outer class 1479 oop result = oopFactory::new_refArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1480 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1481 } 1482 1483 // find inner class info 1484 constantPoolHandle cp(thread, k->constants()); 1485 int length = iter.length(); 1486 1487 // Allocate temp. result array 1488 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length / 4, CHECK_NULL); 1489 refArrayHandle result(THREAD, r); 1490 int members = 0; 1491 1492 for (; !iter.done(); iter.next()) { 1493 int ioff = iter.inner_class_info_index(); 1494 int ooff = iter.outer_class_info_index(); 1495 1496 if (ioff != 0 && ooff != 0) { 1497 // Check to see if the name matches the class we're looking for 1498 // before attempting to find the class. 1499 if (cp->klass_name_at_matches(k, ooff)) { 1500 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1501 if (outer_klass == k) { 1502 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1503 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1504 1505 // Throws an exception if outer klass has not declared k as 1506 // an inner klass 1507 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1508 1509 result->obj_at_put(members, inner_klass->java_mirror()); 1510 members++; 1511 } 1512 } 1513 } 1514 } 1515 1516 if (members != length) { 1517 // Return array of right length 1518 refArrayOop res = oopFactory::new_refArray(vmClasses::Class_klass(), members, CHECK_NULL); 1519 for(int i = 0; i < members; i++) { 1520 res->obj_at_put(i, result->obj_at(i)); 1521 } 1522 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1523 } 1524 1525 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1526 JVM_END 1527 1528 1529 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1530 { 1531 // ofClass is a reference to a java_lang_Class object. 1532 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1533 if (java_lang_Class::is_primitive(ofMirror)) { 1534 return nullptr; 1535 } 1536 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1537 if (!klass->is_instance_klass()) { 1538 return nullptr; 1539 } 1540 1541 bool inner_is_member = false; 1542 Klass* outer_klass 1543 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1544 if (outer_klass == nullptr) return nullptr; // already a top-level class 1545 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1546 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1547 } 1548 JVM_END 1549 1550 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1551 { 1552 oop mirror = JNIHandles::resolve_non_null(cls); 1553 if (java_lang_Class::is_primitive(mirror)) { 1554 return nullptr; 1555 } 1556 Klass* klass = java_lang_Class::as_Klass(mirror); 1557 if (!klass->is_instance_klass()) { 1558 return nullptr; 1559 } 1560 InstanceKlass* k = InstanceKlass::cast(klass); 1561 int ooff = 0, noff = 0; 1562 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1563 if (noff != 0) { 1564 constantPoolHandle i_cp(thread, k->constants()); 1565 Symbol* name = i_cp->symbol_at(noff); 1566 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1567 return (jstring) JNIHandles::make_local(THREAD, str()); 1568 } 1569 } 1570 return nullptr; 1571 } 1572 JVM_END 1573 1574 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1575 assert (cls != nullptr, "illegal class"); 1576 JvmtiVMObjectAllocEventCollector oam; 1577 ResourceMark rm(THREAD); 1578 oop mirror = JNIHandles::resolve_non_null(cls); 1579 // Return null for arrays and primitives 1580 if (!java_lang_Class::is_primitive(mirror)) { 1581 Klass* k = java_lang_Class::as_Klass(mirror); 1582 if (k->is_instance_klass()) { 1583 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1584 if (sym == nullptr) return nullptr; 1585 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1586 return (jstring) JNIHandles::make_local(THREAD, str()); 1587 } 1588 } 1589 return nullptr; 1590 JVM_END 1591 1592 1593 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1594 assert (cls != nullptr, "illegal class"); 1595 oop mirror = JNIHandles::resolve_non_null(cls); 1596 // Return null for arrays and primitives 1597 if (!java_lang_Class::is_primitive(mirror)) { 1598 Klass* k = java_lang_Class::as_Klass(mirror); 1599 if (k->is_instance_klass()) { 1600 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1601 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1602 } 1603 } 1604 return nullptr; 1605 JVM_END 1606 1607 1608 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1609 // some of this code was adapted from from jni_FromReflectedField 1610 1611 oop reflected = JNIHandles::resolve_non_null(field); 1612 oop mirror = java_lang_reflect_Field::clazz(reflected); 1613 int slot = java_lang_reflect_Field::slot(reflected); 1614 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1615 1616 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 1617 int offset = ik->field_offset(slot); 1618 1619 if (modifiers & JVM_ACC_STATIC) { 1620 // for static fields we only look in the current class 1621 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1622 assert(false, "cannot find static field"); 1623 return false; 1624 } 1625 } else { 1626 // for instance fields we start with the current class and work 1627 // our way up through the superclass chain 1628 if (!ik->find_field_from_offset(offset, false, &fd)) { 1629 assert(false, "cannot find instance field"); 1630 return false; 1631 } 1632 } 1633 return true; 1634 } 1635 1636 static Method* jvm_get_method_common(jobject method) { 1637 // some of this code was adapted from from jni_FromReflectedMethod 1638 1639 oop reflected = JNIHandles::resolve_non_null(method); 1640 oop mirror = nullptr; 1641 int slot = 0; 1642 1643 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1644 mirror = java_lang_reflect_Constructor::clazz(reflected); 1645 slot = java_lang_reflect_Constructor::slot(reflected); 1646 } else { 1647 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1648 "wrong type"); 1649 mirror = java_lang_reflect_Method::clazz(reflected); 1650 slot = java_lang_reflect_Method::slot(reflected); 1651 } 1652 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 1653 1654 Method* m = ik->method_with_idnum(slot); 1655 assert(m != nullptr, "cannot find method"); 1656 return m; // caller has to deal with null in product mode 1657 } 1658 1659 /* Type use annotations support (JDK 1.8) */ 1660 1661 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1662 assert (cls != nullptr, "illegal class"); 1663 ResourceMark rm(THREAD); 1664 // Return null for arrays and primitives 1665 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1666 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1667 if (k->is_instance_klass()) { 1668 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1669 if (type_annotations != nullptr) { 1670 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1671 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1672 } 1673 } 1674 } 1675 return nullptr; 1676 JVM_END 1677 1678 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1679 assert (method != nullptr, "illegal method"); 1680 // method is a handle to a java.lang.reflect.Method object 1681 Method* m = jvm_get_method_common(method); 1682 if (m == nullptr) { 1683 return nullptr; 1684 } 1685 1686 AnnotationArray* type_annotations = m->type_annotations(); 1687 if (type_annotations != nullptr) { 1688 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1689 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1690 } 1691 1692 return nullptr; 1693 JVM_END 1694 1695 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1696 assert (field != nullptr, "illegal field"); 1697 fieldDescriptor fd; 1698 bool gotFd = jvm_get_field_common(field, fd); 1699 if (!gotFd) { 1700 return nullptr; 1701 } 1702 1703 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1704 JVM_END 1705 1706 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1707 if (!cp->is_within_bounds(index)) { 1708 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1709 } 1710 } 1711 1712 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1713 { 1714 // method is a handle to a java.lang.reflect.Method object 1715 Method* method_ptr = jvm_get_method_common(method); 1716 methodHandle mh (THREAD, method_ptr); 1717 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1718 const int num_params = mh->method_parameters_length(); 1719 1720 if (num_params < 0) { 1721 // A -1 return value from method_parameters_length means there is no 1722 // parameter data. Return null to indicate this to the reflection 1723 // API. 1724 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1725 return (jobjectArray)nullptr; 1726 } else { 1727 // Otherwise, we return something up to reflection, even if it is 1728 // a zero-length array. Why? Because in some cases this can 1729 // trigger a MalformedParametersException. 1730 1731 // make sure all the symbols are properly formatted 1732 for (int i = 0; i < num_params; i++) { 1733 MethodParametersElement* params = mh->method_parameters_start(); 1734 int index = params[i].name_cp_index; 1735 constantPoolHandle cp(THREAD, mh->constants()); 1736 bounds_check(cp, index, CHECK_NULL); 1737 1738 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1739 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1740 "Wrong type at constant pool index"); 1741 } 1742 1743 } 1744 1745 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1746 objArrayHandle result (THREAD, result_oop); 1747 1748 for (int i = 0; i < num_params; i++) { 1749 MethodParametersElement* params = mh->method_parameters_start(); 1750 // For a 0 index, give a null symbol 1751 Symbol* sym = 0 != params[i].name_cp_index ? 1752 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1753 int flags = params[i].flags; 1754 oop param = Reflection::new_parameter(reflected_method, i, sym, 1755 flags, CHECK_NULL); 1756 result->obj_at_put(i, param); 1757 } 1758 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1759 } 1760 } 1761 JVM_END 1762 1763 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1764 1765 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1766 { 1767 JvmtiVMObjectAllocEventCollector oam; 1768 1769 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1770 // Exclude primitive types and array types 1771 if (java_lang_Class::is_primitive(ofMirror) || 1772 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1773 // Return empty array 1774 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1775 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1776 } 1777 1778 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1779 constantPoolHandle cp(THREAD, k->constants()); 1780 1781 // Ensure class is linked 1782 k->link_class(CHECK_NULL); 1783 1784 // Allocate result 1785 int num_fields; 1786 1787 if (publicOnly) { 1788 num_fields = 0; 1789 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1790 if (fs.access_flags().is_public()) ++num_fields; 1791 } 1792 } else { 1793 num_fields = k->java_fields_count(); 1794 } 1795 1796 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1797 objArrayHandle result (THREAD, r); 1798 1799 int out_idx = 0; 1800 fieldDescriptor fd; 1801 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1802 if (!publicOnly || fs.access_flags().is_public()) { 1803 fd.reinitialize(k, fs.to_FieldInfo()); 1804 oop field = Reflection::new_field(&fd, CHECK_NULL); 1805 result->obj_at_put(out_idx, field); 1806 ++out_idx; 1807 } 1808 } 1809 assert(out_idx == num_fields, "just checking"); 1810 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1811 } 1812 JVM_END 1813 1814 // A class is a record if and only if it is final and a direct subclass of 1815 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1816 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1817 { 1818 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1819 if (k != nullptr && k->is_instance_klass()) { 1820 InstanceKlass* ik = InstanceKlass::cast(k); 1821 return ik->is_record(); 1822 } else { 1823 return false; 1824 } 1825 } 1826 JVM_END 1827 1828 // Returns an array containing the components of the Record attribute, 1829 // or null if the attribute is not present. 1830 // 1831 // Note that this function returns the components of the Record attribute 1832 // even if the class is not a record. 1833 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1834 { 1835 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass)); 1836 1837 Array<RecordComponent*>* components = ik->record_components(); 1838 if (components != nullptr) { 1839 JvmtiVMObjectAllocEventCollector oam; 1840 constantPoolHandle cp(THREAD, ik->constants()); 1841 int length = components->length(); 1842 assert(length >= 0, "unexpected record_components length"); 1843 objArrayOop record_components = 1844 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1845 objArrayHandle components_h (THREAD, record_components); 1846 1847 for (int x = 0; x < length; x++) { 1848 RecordComponent* component = components->at(x); 1849 assert(component != nullptr, "unexpected null record component"); 1850 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1851 components_h->obj_at_put(x, component_oop); 1852 } 1853 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1854 } 1855 1856 return nullptr; 1857 } 1858 JVM_END 1859 1860 static jobjectArray get_class_declared_methods_helper( 1861 JNIEnv *env, 1862 jclass ofClass, jboolean publicOnly, 1863 bool want_constructor, 1864 Klass* klass, TRAPS) { 1865 1866 JvmtiVMObjectAllocEventCollector oam; 1867 1868 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1869 // Exclude primitive types and array types 1870 if (java_lang_Class::is_primitive(ofMirror) 1871 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1872 // Return empty array 1873 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1874 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1875 } 1876 1877 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1878 1879 // Ensure class is linked 1880 k->link_class(CHECK_NULL); 1881 1882 Array<Method*>* methods = k->methods(); 1883 int methods_length = methods->length(); 1884 1885 // Save original method_idnum in case of redefinition, which can change 1886 // the idnum of obsolete methods. The new method will have the same idnum 1887 // but if we refresh the methods array, the counts will be wrong. 1888 ResourceMark rm(THREAD); 1889 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1890 int num_methods = 0; 1891 1892 // Select methods matching the criteria. 1893 for (int i = 0; i < methods_length; i++) { 1894 Method* method = methods->at(i); 1895 if (want_constructor && !method->is_object_constructor()) { 1896 continue; 1897 } 1898 if (!want_constructor && 1899 (method->is_object_constructor() || method->is_class_initializer() || 1900 method->is_overpass())) { 1901 continue; 1902 } 1903 if (publicOnly && !method->is_public()) { 1904 continue; 1905 } 1906 idnums->push(method->method_idnum()); 1907 ++num_methods; 1908 } 1909 1910 // Allocate result 1911 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1912 objArrayHandle result (THREAD, r); 1913 1914 // Now just put the methods that we selected above, but go by their idnum 1915 // in case of redefinition. The methods can be redefined at any safepoint, 1916 // so above when allocating the oop array and below when creating reflect 1917 // objects. 1918 for (int i = 0; i < num_methods; i++) { 1919 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1920 if (method.is_null()) { 1921 // Method may have been deleted and seems this API can handle null 1922 // Otherwise should probably put a method that throws NSME 1923 result->obj_at_put(i, nullptr); 1924 } else { 1925 oop m; 1926 if (want_constructor) { 1927 assert(method->is_object_constructor(), "must be"); 1928 m = Reflection::new_constructor(method, CHECK_NULL); 1929 } else { 1930 m = Reflection::new_method(method, false, CHECK_NULL); 1931 } 1932 result->obj_at_put(i, m); 1933 } 1934 } 1935 1936 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1937 } 1938 1939 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1940 { 1941 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1942 /*want_constructor*/ false, 1943 vmClasses::reflect_Method_klass(), THREAD); 1944 } 1945 JVM_END 1946 1947 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1948 { 1949 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1950 /*want_constructor*/ true, 1951 vmClasses::reflect_Constructor_klass(), THREAD); 1952 } 1953 JVM_END 1954 1955 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1956 { 1957 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1958 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member)); 1959 return c->has_nestmate_access_to(m, THREAD); 1960 } 1961 JVM_END 1962 1963 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1964 { 1965 // current is not a primitive or array class 1966 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1967 InstanceKlass* host = c->nest_host(THREAD); 1968 return (jclass) (host == nullptr ? nullptr : 1969 JNIHandles::make_local(THREAD, host->java_mirror())); 1970 } 1971 JVM_END 1972 1973 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1974 { 1975 // current is not a primitive or array class 1976 ResourceMark rm(THREAD); 1977 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1978 InstanceKlass* host = c->nest_host(THREAD); 1979 1980 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 1981 c->external_name(), host->external_name()); 1982 { 1983 JvmtiVMObjectAllocEventCollector oam; 1984 Array<u2>* members = host->nest_members(); 1985 int length = members == nullptr ? 0 : members->length(); 1986 1987 log_trace(class, nestmates)(" - host has %d listed nest members", length); 1988 1989 // nest host is first in the array so make it one bigger 1990 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length + 1, CHECK_NULL); 1991 refArrayHandle result(THREAD, r); 1992 result->obj_at_put(0, host->java_mirror()); 1993 if (length != 0) { 1994 int count = 0; 1995 for (int i = 0; i < length; i++) { 1996 int cp_index = members->at(i); 1997 Klass* k = host->constants()->klass_at(cp_index, THREAD); 1998 if (HAS_PENDING_EXCEPTION) { 1999 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2000 return nullptr; // propagate VMEs 2001 } 2002 if (log_is_enabled(Trace, class, nestmates)) { 2003 stringStream ss; 2004 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2005 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2006 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2007 log_trace(class, nestmates)("%s", ss.as_string()); 2008 } 2009 CLEAR_PENDING_EXCEPTION; 2010 continue; 2011 } 2012 if (k->is_instance_klass()) { 2013 InstanceKlass* ik = InstanceKlass::cast(k); 2014 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2015 if (nest_host_k == host) { 2016 result->obj_at_put(count+1, k->java_mirror()); 2017 count++; 2018 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2019 } else { 2020 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2021 ik->external_name(), nest_host_k->external_name()); 2022 } 2023 } else { 2024 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2025 k->external_name()); 2026 } 2027 } 2028 if (count < length) { 2029 // we had invalid entries so we need to compact the array 2030 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2031 length + 1, count + 1); 2032 2033 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2034 count + 1, CHECK_NULL); 2035 objArrayHandle result2(THREAD, r2); 2036 for (int i = 0; i < count + 1; i++) { 2037 result2->obj_at_put(i, result->obj_at(i)); 2038 } 2039 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2040 } 2041 } 2042 else { 2043 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate"); 2044 } 2045 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2046 } 2047 } 2048 JVM_END 2049 2050 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2051 { 2052 oop mirror = JNIHandles::resolve_non_null(current); 2053 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2054 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 2055 2056 ResourceMark rm(THREAD); 2057 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2058 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2059 if (ik->is_sealed()) { 2060 JvmtiVMObjectAllocEventCollector oam; 2061 Array<u2>* subclasses = ik->permitted_subclasses(); 2062 int length = subclasses->length(); 2063 2064 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2065 2066 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length, CHECK_NULL); 2067 refArrayHandle result(THREAD, r); 2068 int count = 0; 2069 for (int i = 0; i < length; i++) { 2070 int cp_index = subclasses->at(i); 2071 Klass* k = ik->constants()->klass_at(cp_index, THREAD); 2072 if (HAS_PENDING_EXCEPTION) { 2073 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2074 return nullptr; // propagate VMEs 2075 } 2076 if (log_is_enabled(Trace, class, sealed)) { 2077 stringStream ss; 2078 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2079 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2080 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2081 log_trace(class, sealed)("%s", ss.as_string()); 2082 } 2083 2084 CLEAR_PENDING_EXCEPTION; 2085 continue; 2086 } 2087 if (k->is_instance_klass()) { 2088 result->obj_at_put(count++, k->java_mirror()); 2089 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2090 } 2091 } 2092 if (count < length) { 2093 // we had invalid entries so we need to compact the array 2094 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2095 count, CHECK_NULL); 2096 objArrayHandle result2(THREAD, r2); 2097 for (int i = 0; i < count; i++) { 2098 result2->obj_at_put(i, result->obj_at(i)); 2099 } 2100 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2101 } 2102 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2103 } else { 2104 return nullptr; 2105 } 2106 } 2107 JVM_END 2108 2109 // Constant pool access ////////////////////////////////////////////////////////// 2110 2111 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2112 { 2113 JvmtiVMObjectAllocEventCollector oam; 2114 oop mirror = JNIHandles::resolve_non_null(cls); 2115 // Return null for primitives and arrays 2116 if (!java_lang_Class::is_primitive(mirror)) { 2117 Klass* k = java_lang_Class::as_Klass(mirror); 2118 if (k->is_instance_klass()) { 2119 InstanceKlass* k_h = InstanceKlass::cast(k); 2120 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2121 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2122 return JNIHandles::make_local(THREAD, jcp()); 2123 } 2124 } 2125 return nullptr; 2126 } 2127 JVM_END 2128 2129 2130 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj)) 2131 { 2132 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2133 return cp->length(); 2134 } 2135 JVM_END 2136 2137 2138 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index)) 2139 { 2140 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2141 bounds_check(cp, index, CHECK_NULL); 2142 constantTag tag = cp->tag_at(index); 2143 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2144 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2145 } 2146 Klass* k = cp->klass_at(index, CHECK_NULL); 2147 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2148 } 2149 JVM_END 2150 2151 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2152 { 2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2154 bounds_check(cp, index, CHECK_NULL); 2155 constantTag tag = cp->tag_at(index); 2156 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2157 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2158 } 2159 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2160 if (k == nullptr) return nullptr; 2161 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2162 } 2163 JVM_END 2164 2165 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2166 constantTag tag = cp->tag_at(index); 2167 if (!tag.is_method() && !tag.is_interface_method()) { 2168 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2169 } 2170 int klass_ref = cp->uncached_klass_ref_index_at(index); 2171 Klass* k_o; 2172 if (force_resolution) { 2173 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2174 } else { 2175 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2176 if (k_o == nullptr) return nullptr; 2177 } 2178 InstanceKlass* k = InstanceKlass::cast(k_o); 2179 Symbol* name = cp->uncached_name_ref_at(index); 2180 Symbol* sig = cp->uncached_signature_ref_at(index); 2181 methodHandle m (THREAD, k->find_method(name, sig)); 2182 if (m.is_null()) { 2183 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2184 } 2185 oop method; 2186 if (m->is_object_constructor()) { 2187 method = Reflection::new_constructor(m, CHECK_NULL); 2188 } else { 2189 method = Reflection::new_method(m, true, CHECK_NULL); 2190 } 2191 return JNIHandles::make_local(THREAD, method); 2192 } 2193 2194 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index)) 2195 { 2196 JvmtiVMObjectAllocEventCollector oam; 2197 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2198 bounds_check(cp, index, CHECK_NULL); 2199 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2200 return res; 2201 } 2202 JVM_END 2203 2204 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2205 { 2206 JvmtiVMObjectAllocEventCollector oam; 2207 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2208 bounds_check(cp, index, CHECK_NULL); 2209 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2210 return res; 2211 } 2212 JVM_END 2213 2214 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2215 constantTag tag = cp->tag_at(index); 2216 if (!tag.is_field()) { 2217 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2218 } 2219 int klass_ref = cp->uncached_klass_ref_index_at(index); 2220 Klass* k_o; 2221 if (force_resolution) { 2222 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2223 } else { 2224 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2225 if (k_o == nullptr) return nullptr; 2226 } 2227 InstanceKlass* k = InstanceKlass::cast(k_o); 2228 Symbol* name = cp->uncached_name_ref_at(index); 2229 Symbol* sig = cp->uncached_signature_ref_at(index); 2230 fieldDescriptor fd; 2231 Klass* target_klass = k->find_field(name, sig, &fd); 2232 if (target_klass == nullptr) { 2233 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2234 } 2235 oop field = Reflection::new_field(&fd, CHECK_NULL); 2236 return JNIHandles::make_local(THREAD, field); 2237 } 2238 2239 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index)) 2240 { 2241 JvmtiVMObjectAllocEventCollector oam; 2242 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2243 bounds_check(cp, index, CHECK_NULL); 2244 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2245 return res; 2246 } 2247 JVM_END 2248 2249 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2250 { 2251 JvmtiVMObjectAllocEventCollector oam; 2252 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2253 bounds_check(cp, index, CHECK_NULL); 2254 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2255 return res; 2256 } 2257 JVM_END 2258 2259 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(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 constantTag tag = cp->tag_at(index); 2265 if (!tag.is_field_or_method()) { 2266 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2267 } 2268 int klass_ref = cp->uncached_klass_ref_index_at(index); 2269 Symbol* klass_name = cp->klass_name_at(klass_ref); 2270 Symbol* member_name = cp->uncached_name_ref_at(index); 2271 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2272 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2273 objArrayHandle dest(THREAD, dest_o); 2274 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2275 dest->obj_at_put(0, str()); 2276 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2277 dest->obj_at_put(1, str()); 2278 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2279 dest->obj_at_put(2, str()); 2280 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2281 } 2282 JVM_END 2283 2284 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index)) 2285 { 2286 JvmtiVMObjectAllocEventCollector oam; 2287 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2288 bounds_check(cp, index, CHECK_0); 2289 constantTag tag = cp->tag_at(index); 2290 if (!tag.is_field_or_method()) { 2291 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2292 } 2293 return (jint) cp->uncached_klass_ref_index_at(index); 2294 } 2295 JVM_END 2296 2297 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index)) 2298 { 2299 JvmtiVMObjectAllocEventCollector oam; 2300 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2301 bounds_check(cp, index, CHECK_0); 2302 constantTag tag = cp->tag_at(index); 2303 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2304 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2305 } 2306 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2307 } 2308 JVM_END 2309 2310 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index)) 2311 { 2312 JvmtiVMObjectAllocEventCollector oam; 2313 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2314 bounds_check(cp, index, CHECK_NULL); 2315 constantTag tag = cp->tag_at(index); 2316 if (!tag.is_name_and_type()) { 2317 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2318 } 2319 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2320 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2321 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2322 objArrayHandle dest(THREAD, dest_o); 2323 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2324 dest->obj_at_put(0, str()); 2325 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2326 dest->obj_at_put(1, str()); 2327 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2328 } 2329 JVM_END 2330 2331 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index)) 2332 { 2333 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2334 bounds_check(cp, index, CHECK_0); 2335 constantTag tag = cp->tag_at(index); 2336 if (!tag.is_int()) { 2337 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2338 } 2339 return cp->int_at(index); 2340 } 2341 JVM_END 2342 2343 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index)) 2344 { 2345 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2346 bounds_check(cp, index, CHECK_(0L)); 2347 constantTag tag = cp->tag_at(index); 2348 if (!tag.is_long()) { 2349 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2350 } 2351 return cp->long_at(index); 2352 } 2353 JVM_END 2354 2355 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index)) 2356 { 2357 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2358 bounds_check(cp, index, CHECK_(0.0f)); 2359 constantTag tag = cp->tag_at(index); 2360 if (!tag.is_float()) { 2361 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2362 } 2363 return cp->float_at(index); 2364 } 2365 JVM_END 2366 2367 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index)) 2368 { 2369 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2370 bounds_check(cp, index, CHECK_(0.0)); 2371 constantTag tag = cp->tag_at(index); 2372 if (!tag.is_double()) { 2373 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2374 } 2375 return cp->double_at(index); 2376 } 2377 JVM_END 2378 2379 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index)) 2380 { 2381 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2382 bounds_check(cp, index, CHECK_NULL); 2383 constantTag tag = cp->tag_at(index); 2384 if (!tag.is_string()) { 2385 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2386 } 2387 oop str = cp->string_at(index, CHECK_NULL); 2388 return (jstring) JNIHandles::make_local(THREAD, str); 2389 } 2390 JVM_END 2391 2392 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index)) 2393 { 2394 JvmtiVMObjectAllocEventCollector oam; 2395 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2396 bounds_check(cp, index, CHECK_NULL); 2397 constantTag tag = cp->tag_at(index); 2398 if (!tag.is_symbol()) { 2399 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2400 } 2401 Symbol* sym = cp->symbol_at(index); 2402 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2403 return (jstring) JNIHandles::make_local(THREAD, str()); 2404 } 2405 JVM_END 2406 2407 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index)) 2408 { 2409 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2410 bounds_check(cp, index, CHECK_0); 2411 constantTag tag = cp->tag_at(index); 2412 jbyte result = tag.value(); 2413 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2414 // they are changed to the corresponding tags from the JVM spec, so that java code in 2415 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2416 if (tag.is_klass_or_reference()) { 2417 result = JVM_CONSTANT_Class; 2418 } else if (tag.is_string_index()) { 2419 result = JVM_CONSTANT_String; 2420 } else if (tag.is_method_type_in_error()) { 2421 result = JVM_CONSTANT_MethodType; 2422 } else if (tag.is_method_handle_in_error()) { 2423 result = JVM_CONSTANT_MethodHandle; 2424 } else if (tag.is_dynamic_constant_in_error()) { 2425 result = JVM_CONSTANT_Dynamic; 2426 } 2427 return result; 2428 } 2429 JVM_END 2430 2431 // Assertion support. ////////////////////////////////////////////////////////// 2432 2433 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2434 assert(cls != nullptr, "bad class"); 2435 2436 oop r = JNIHandles::resolve(cls); 2437 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2438 if (java_lang_Class::is_primitive(r)) return false; 2439 2440 Klass* k = java_lang_Class::as_Klass(r); 2441 assert(k->is_instance_klass(), "must be an instance klass"); 2442 if (!k->is_instance_klass()) return false; 2443 2444 ResourceMark rm(THREAD); 2445 const char* name = k->name()->as_C_string(); 2446 bool system_class = k->class_loader() == nullptr; 2447 return JavaAssertions::enabled(name, system_class); 2448 2449 JVM_END 2450 2451 2452 // Return a new AssertionStatusDirectives object with the fields filled in with 2453 // command-line assertion arguments (i.e., -ea, -da). 2454 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2455 JvmtiVMObjectAllocEventCollector oam; 2456 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2457 return JNIHandles::make_local(THREAD, asd); 2458 JVM_END 2459 2460 // Verification //////////////////////////////////////////////////////////////////////////////// 2461 2462 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2463 2464 // RedefineClasses support: bug 6214132 caused verification to fail. 2465 // All functions from this section, unless noted otherwise, should call the functions 2466 // get_klass_considering_redefinition(), or 2467 // get_instance_klass_considering_redefinition() 2468 // These functions return JvmtiThreadState::_scratch_class if the verifier 2469 // was invoked in the middle of the redefinition of cls. 2470 // See jvmtiThreadState.hpp for details. 2471 2472 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) { 2473 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2474 if (k->is_instance_klass()) { 2475 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread); 2476 } else { 2477 return k; 2478 } 2479 } 2480 2481 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) { 2482 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls)); 2483 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread); 2484 } 2485 2486 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 2487 oop mirror = JNIHandles::resolve_non_null(cls); 2488 if (java_lang_Class::is_primitive(mirror)) { 2489 return JNI_FALSE; 2490 } 2491 Klass* k = java_lang_Class::as_Klass(mirror); 2492 // This isn't necessary since answer is the same because redefinition 2493 // has already checked this matches for the scratch class. 2494 // k = get_klass_considering_redefinition(cls, thread) 2495 jboolean result = k->is_interface(); 2496 assert(!result || k->is_instance_klass(), 2497 "all interfaces are instance types"); 2498 return result; 2499 JVM_END 2500 2501 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2502 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name. 2503 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2504 return k->name()->as_utf8(); 2505 JVM_END 2506 2507 2508 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2509 Klass* k = get_klass_considering_redefinition(cls, thread); 2510 // types will have length zero if this is not an InstanceKlass 2511 // (length is determined by call to JVM_GetClassCPEntriesCount) 2512 if (k->is_instance_klass()) { 2513 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2514 for (int index = cp->length() - 1; index >= 0; index--) { 2515 constantTag tag = cp->tag_at(index); 2516 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2517 } 2518 } 2519 JVM_END 2520 2521 2522 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2523 Klass* k = get_klass_considering_redefinition(cls, thread); 2524 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2525 JVM_END 2526 2527 2528 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2529 Klass* k = get_klass_considering_redefinition(cls, thread); 2530 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2531 JVM_END 2532 2533 2534 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2535 Klass* k = get_klass_considering_redefinition(cls, thread); 2536 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2537 JVM_END 2538 2539 2540 // The following methods, used for the verifier, are never called with 2541 // array klasses, so a direct cast to InstanceKlass is safe. 2542 // Typically, these methods are called in a loop with bounds determined 2543 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2544 // zero for arrays. 2545 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2546 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2547 Method* method = ik->methods()->at(method_index); 2548 int length = method->checked_exceptions_length(); 2549 if (length > 0) { 2550 CheckedExceptionElement* table= method->checked_exceptions_start(); 2551 for (int i = 0; i < length; i++) { 2552 exceptions[i] = table[i].class_cp_index; 2553 } 2554 } 2555 JVM_END 2556 2557 2558 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2559 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2560 Method* method = ik->methods()->at(method_index); 2561 return method->checked_exceptions_length(); 2562 JVM_END 2563 2564 2565 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2566 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2567 Method* method = ik->methods()->at(method_index); 2568 memcpy(code, method->code_base(), method->code_size()); 2569 JVM_END 2570 2571 2572 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2573 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2574 Method* method = ik->methods()->at(method_index); 2575 return method->code_size(); 2576 JVM_END 2577 2578 2579 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2580 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2581 Method* method = ik->methods()->at(method_index); 2582 ExceptionTable extable(method); 2583 entry->start_pc = extable.start_pc(entry_index); 2584 entry->end_pc = extable.end_pc(entry_index); 2585 entry->handler_pc = extable.handler_pc(entry_index); 2586 entry->catchType = extable.catch_type_index(entry_index); 2587 JVM_END 2588 2589 2590 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2591 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2592 Method* method = ik->methods()->at(method_index); 2593 return method->exception_table_length(); 2594 JVM_END 2595 2596 2597 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2598 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2599 Method* method = ik->methods()->at(method_index); 2600 return method->access_flags().as_method_flags(); 2601 JVM_END 2602 2603 2604 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2605 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2606 return ik->field_access_flags(field_index); 2607 JVM_END 2608 2609 2610 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(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->max_locals(); 2614 JVM_END 2615 2616 2617 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(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->size_of_parameters(); 2621 JVM_END 2622 2623 2624 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2625 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2626 Method* method = ik->methods()->at(method_index); 2627 return method->verifier_max_stack(); 2628 JVM_END 2629 2630 2631 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2632 ResourceMark rm(THREAD); 2633 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2634 Method* method = ik->methods()->at(method_index); 2635 return method->is_object_constructor(); 2636 JVM_END 2637 2638 2639 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2640 ResourceMark rm(THREAD); 2641 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2642 Method* method = ik->methods()->at(method_index); 2643 return method->is_overpass(); 2644 JVM_END 2645 2646 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2647 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2648 Method* method = ik->methods()->at(method_index); 2649 return method->name()->as_utf8(); 2650 JVM_END 2651 2652 2653 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2654 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2655 Method* method = ik->methods()->at(method_index); 2656 return method->signature()->as_utf8(); 2657 JVM_END 2658 2659 /** 2660 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2661 * read entries in the constant pool. Since the old verifier always 2662 * works on a copy of the code, it will not see any rewriting that 2663 * may possibly occur in the middle of verification. So it is important 2664 * that nothing it calls tries to use the cpCache instead of the raw 2665 * constant pool, so we must use cp->uncached_x methods when appropriate. 2666 */ 2667 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2668 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2669 ConstantPool* cp = ik->constants(); 2670 switch (cp->tag_at(cp_index).value()) { 2671 case JVM_CONSTANT_Fieldref: 2672 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2673 default: 2674 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2675 } 2676 ShouldNotReachHere(); 2677 return nullptr; 2678 JVM_END 2679 2680 2681 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2682 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2683 ConstantPool* cp = ik->constants(); 2684 switch (cp->tag_at(cp_index).value()) { 2685 case JVM_CONSTANT_InterfaceMethodref: 2686 case JVM_CONSTANT_Methodref: 2687 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2688 default: 2689 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2690 } 2691 ShouldNotReachHere(); 2692 return nullptr; 2693 JVM_END 2694 2695 2696 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2697 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2698 ConstantPool* cp = ik->constants(); 2699 switch (cp->tag_at(cp_index).value()) { 2700 case JVM_CONSTANT_InterfaceMethodref: 2701 case JVM_CONSTANT_Methodref: 2702 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2703 default: 2704 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2705 } 2706 ShouldNotReachHere(); 2707 return nullptr; 2708 JVM_END 2709 2710 2711 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2712 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2713 ConstantPool* cp = ik->constants(); 2714 switch (cp->tag_at(cp_index).value()) { 2715 case JVM_CONSTANT_Fieldref: 2716 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2717 default: 2718 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2719 } 2720 ShouldNotReachHere(); 2721 return nullptr; 2722 JVM_END 2723 2724 2725 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2726 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2727 ConstantPool* cp = ik->constants(); 2728 Symbol* classname = cp->klass_name_at(cp_index); 2729 return classname->as_utf8(); 2730 JVM_END 2731 2732 2733 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2734 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2735 ConstantPool* cp = ik->constants(); 2736 switch (cp->tag_at(cp_index).value()) { 2737 case JVM_CONSTANT_Fieldref: { 2738 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2739 Symbol* classname = cp->klass_name_at(class_index); 2740 return classname->as_utf8(); 2741 } 2742 default: 2743 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2744 } 2745 ShouldNotReachHere(); 2746 return nullptr; 2747 JVM_END 2748 2749 2750 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2751 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2752 ConstantPool* cp = ik->constants(); 2753 switch (cp->tag_at(cp_index).value()) { 2754 case JVM_CONSTANT_Methodref: 2755 case JVM_CONSTANT_InterfaceMethodref: { 2756 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2757 Symbol* classname = cp->klass_name_at(class_index); 2758 return classname->as_utf8(); 2759 } 2760 default: 2761 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2762 } 2763 ShouldNotReachHere(); 2764 return nullptr; 2765 JVM_END 2766 2767 2768 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2769 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2770 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread); 2771 ConstantPool* cp = ik->constants(); 2772 ConstantPool* cp_called = ik_called->constants(); 2773 switch (cp->tag_at(cp_index).value()) { 2774 case JVM_CONSTANT_Fieldref: { 2775 Symbol* name = cp->uncached_name_ref_at(cp_index); 2776 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2777 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) { 2778 if (fs.name() == name && fs.signature() == signature) { 2779 return fs.access_flags().as_field_flags(); 2780 } 2781 } 2782 return -1; 2783 } 2784 default: 2785 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2786 } 2787 ShouldNotReachHere(); 2788 return 0; 2789 JVM_END 2790 2791 2792 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2793 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2794 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread); 2795 ConstantPool* cp = ik->constants(); 2796 switch (cp->tag_at(cp_index).value()) { 2797 case JVM_CONSTANT_Methodref: 2798 case JVM_CONSTANT_InterfaceMethodref: { 2799 Symbol* name = cp->uncached_name_ref_at(cp_index); 2800 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2801 Array<Method*>* methods = ik_called->methods(); 2802 int methods_count = methods->length(); 2803 for (int i = 0; i < methods_count; i++) { 2804 Method* method = methods->at(i); 2805 if (method->name() == name && method->signature() == signature) { 2806 return method->access_flags().as_method_flags(); 2807 } 2808 } 2809 return -1; 2810 } 2811 default: 2812 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2813 } 2814 ShouldNotReachHere(); 2815 return 0; 2816 JVM_END 2817 2818 2819 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2820 2821 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2822 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2823 JVM_END 2824 2825 2826 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2827 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2828 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2829 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2830 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2831 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2832 JVM_END 2833 2834 // Printing support ////////////////////////////////////////////////// 2835 extern "C" { 2836 2837 ATTRIBUTE_PRINTF(3, 0) 2838 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2839 // Reject count values that are negative signed values converted to 2840 // unsigned; see bug 4399518, 4417214 2841 if ((intptr_t)count <= 0) return -1; 2842 2843 int result = os::vsnprintf(str, count, fmt, args); 2844 if (result > 0 && (size_t)result >= count) { 2845 result = -1; 2846 } 2847 2848 return result; 2849 } 2850 2851 ATTRIBUTE_PRINTF(3, 4) 2852 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2853 va_list args; 2854 int len; 2855 va_start(args, fmt); 2856 len = jio_vsnprintf(str, count, fmt, args); 2857 va_end(args); 2858 return len; 2859 } 2860 2861 ATTRIBUTE_PRINTF(2, 3) 2862 int jio_fprintf(FILE* f, const char *fmt, ...) { 2863 int len; 2864 va_list args; 2865 va_start(args, fmt); 2866 len = jio_vfprintf(f, fmt, args); 2867 va_end(args); 2868 return len; 2869 } 2870 2871 ATTRIBUTE_PRINTF(2, 0) 2872 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2873 if (Arguments::vfprintf_hook() != nullptr) { 2874 return Arguments::vfprintf_hook()(f, fmt, args); 2875 } else { 2876 return vfprintf(f, fmt, args); 2877 } 2878 } 2879 2880 ATTRIBUTE_PRINTF(1, 2) 2881 JNIEXPORT int jio_printf(const char *fmt, ...) { 2882 int len; 2883 va_list args; 2884 va_start(args, fmt); 2885 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2886 va_end(args); 2887 return len; 2888 } 2889 2890 // HotSpot specific jio method 2891 void jio_print(const char* s, size_t len) { 2892 // Try to make this function as atomic as possible. 2893 if (Arguments::vfprintf_hook() != nullptr) { 2894 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2895 } else { 2896 // Make an unused local variable to avoid warning from gcc compiler. 2897 bool dummy = os::write(defaultStream::output_fd(), s, len); 2898 } 2899 } 2900 2901 } // Extern C 2902 2903 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2904 2905 // In most of the JVM thread support functions we need to access the 2906 // thread through a ThreadsListHandle to prevent it from exiting and 2907 // being reclaimed while we try to operate on it. The exceptions to this 2908 // rule are when operating on the current thread, or if the monitor of 2909 // the target java.lang.Thread is locked at the Java level - in both 2910 // cases the target cannot exit. 2911 2912 static void thread_entry(JavaThread* thread, TRAPS) { 2913 HandleMark hm(THREAD); 2914 Handle obj(THREAD, thread->threadObj()); 2915 JavaValue result(T_VOID); 2916 JavaCalls::call_virtual(&result, 2917 obj, 2918 vmClasses::Thread_klass(), 2919 vmSymbols::run_method_name(), 2920 vmSymbols::void_method_signature(), 2921 THREAD); 2922 } 2923 2924 2925 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2926 #if INCLUDE_CDS 2927 if (CDSConfig::allow_only_single_java_thread()) { 2928 // During java -Xshare:dump, if we allow multiple Java threads to 2929 // execute in parallel, symbols and classes may be loaded in 2930 // random orders which will make the resulting CDS archive 2931 // non-deterministic. 2932 // 2933 // Lucikly, during java -Xshare:dump, it's important to run only 2934 // the code in the main Java thread (which is NOT started here) that 2935 // creates the module graph, etc. It's safe to not start the other 2936 // threads which are launched by class static initializers 2937 // (ReferenceHandler, FinalizerThread and CleanerImpl). 2938 if (log_is_enabled(Info, aot)) { 2939 ResourceMark rm; 2940 oop t = JNIHandles::resolve_non_null(jthread); 2941 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 2942 } 2943 return; 2944 } 2945 #endif 2946 JavaThread *native_thread = nullptr; 2947 2948 // We cannot hold the Threads_lock when we throw an exception, 2949 // due to rank ordering issues. Example: we might need to grab the 2950 // Heap_lock while we construct the exception. 2951 bool throw_illegal_thread_state = false; 2952 2953 // We must release the Threads_lock before we can post a jvmti event 2954 // in Thread::start. 2955 { 2956 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock); 2957 // Ensure that the C++ Thread and OSThread structures aren't freed before 2958 // we operate. 2959 MutexLocker ml(Threads_lock); 2960 2961 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2962 // re-starting an already started thread, so we should usually find 2963 // that the JavaThread is null. However for a JNI attached thread 2964 // there is a small window between the Thread object being created 2965 // (with its JavaThread set) and the update to its threadStatus, so we 2966 // have to check for this 2967 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 2968 throw_illegal_thread_state = true; 2969 } else { 2970 jlong size = 2971 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2972 // Allocate the C++ Thread structure and create the native thread. The 2973 // stack size retrieved from java is 64-bit signed, but the constructor takes 2974 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2975 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2976 // - Avoid passing negative values which would result in really large stacks. 2977 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2978 size_t sz = size > 0 ? (size_t) size : 0; 2979 native_thread = new JavaThread(&thread_entry, sz); 2980 2981 // At this point it may be possible that no osthread was created for the 2982 // JavaThread due to lack of memory. Check for this situation and throw 2983 // an exception if necessary. Eventually we may want to change this so 2984 // that we only grab the lock if the thread was created successfully - 2985 // then we can also do this check and throw the exception in the 2986 // JavaThread constructor. 2987 if (native_thread->osthread() != nullptr) { 2988 // Note: the current thread is not being used within "prepare". 2989 native_thread->prepare(jthread); 2990 } 2991 } 2992 } 2993 2994 if (throw_illegal_thread_state) { 2995 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2996 } 2997 2998 assert(native_thread != nullptr, "Starting null thread?"); 2999 3000 if (native_thread->osthread() == nullptr) { 3001 ResourceMark rm(thread); 3002 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 3003 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 3004 // No one should hold a reference to the 'native_thread'. 3005 native_thread->smr_delete(); 3006 if (JvmtiExport::should_post_resource_exhausted()) { 3007 JvmtiExport::post_resource_exhausted( 3008 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3009 os::native_thread_creation_failed_msg()); 3010 } 3011 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3012 os::native_thread_creation_failed_msg()); 3013 } 3014 3015 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3016 3017 Thread::start(native_thread); 3018 3019 JVM_END 3020 3021 3022 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3023 ThreadsListHandle tlh(thread); 3024 oop java_thread = nullptr; 3025 JavaThread* receiver = nullptr; 3026 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3027 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3028 3029 if (is_alive) { 3030 // jthread refers to a live JavaThread. 3031 Thread::set_priority(receiver, (ThreadPriority)prio); 3032 } 3033 // Implied else: If the JavaThread hasn't started yet, then the 3034 // priority set in the java.lang.Thread object above will be pushed 3035 // down when it does start. 3036 JVM_END 3037 3038 3039 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3040 HOTSPOT_THREAD_YIELD(); 3041 os::naked_yield(); 3042 JVM_END 3043 3044 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos)) 3045 if (nanos < 0) { 3046 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range"); 3047 } 3048 3049 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3050 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3051 } 3052 3053 // Save current thread state and restore it at the end of this block. 3054 // And set new thread state to SLEEPING. 3055 JavaThreadSleepState jtss(thread); 3056 3057 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC); 3058 3059 if (nanos == 0) { 3060 os::naked_yield(); 3061 } else { 3062 ThreadState old_state = thread->osthread()->get_state(); 3063 thread->osthread()->set_state(SLEEPING); 3064 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed 3065 // An asynchronous exception could have been thrown on 3066 // us while we were sleeping. We do not overwrite those. 3067 if (!HAS_PENDING_EXCEPTION) { 3068 HOTSPOT_THREAD_SLEEP_END(1); 3069 if (!thread->has_async_exception_condition()) { 3070 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3071 // to properly restore the thread state. That's likely wrong. 3072 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3073 } 3074 } 3075 } 3076 thread->osthread()->set_state(old_state); 3077 } 3078 HOTSPOT_THREAD_SLEEP_END(0); 3079 JVM_END 3080 3081 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3082 oop jthread = thread->threadObj(); 3083 assert(jthread != nullptr, "no current carrier thread!"); 3084 return JNIHandles::make_local(THREAD, jthread); 3085 JVM_END 3086 3087 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3088 oop theThread = thread->vthread(); 3089 assert(theThread != (oop)nullptr, "no current thread!"); 3090 return JNIHandles::make_local(THREAD, theThread); 3091 JVM_END 3092 3093 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3094 jobject theThread)) 3095 oop threadObj = JNIHandles::resolve(theThread); 3096 thread->set_vthread(threadObj); 3097 3098 // Set _monitor_owner_id of new current Thread 3099 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj)); 3100 3101 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3102 JVM_END 3103 3104 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3105 return ThreadIdentifier::unsafe_offset(); 3106 JVM_END 3107 3108 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3109 ThreadsListHandle tlh(thread); 3110 JavaThread* receiver = nullptr; 3111 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3112 if (is_alive) { 3113 // jthread refers to a live JavaThread. 3114 receiver->interrupt(); 3115 } 3116 JVM_END 3117 3118 // Return true iff the current thread has locked the object passed in 3119 3120 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3121 if (obj == nullptr) { 3122 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3123 } 3124 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3125 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3126 JVM_END 3127 3128 JVM_ENTRY(jobjectArray, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3129 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD); 3130 return (jobjectArray) JNIHandles::make_local(THREAD, trace); 3131 JVM_END 3132 3133 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread)) 3134 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD); 3135 return JNIHandles::make_local(THREAD, snapshot); 3136 JVM_END 3137 3138 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3139 // We don't use a ThreadsListHandle here because the current thread 3140 // must be alive. 3141 oop java_thread = JNIHandles::resolve_non_null(jthread); 3142 JavaThread* thr = java_lang_Thread::thread(java_thread); 3143 if (thread == thr && !thr->has_attached_via_jni()) { 3144 // Thread naming is only supported for the current thread and 3145 // we don't set the name of an attached thread to avoid stepping 3146 // on other programs. 3147 ResourceMark rm(thread); 3148 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3149 os::set_native_thread_name(thread_name); 3150 } 3151 JVM_END 3152 3153 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3154 oop theCache = thread->scopedValueCache(); 3155 return JNIHandles::make_local(THREAD, theCache); 3156 JVM_END 3157 3158 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3159 jobject theCache)) 3160 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3161 thread->set_scopedValueCache(objs); 3162 JVM_END 3163 3164 3165 // java.lang.Package //////////////////////////////////////////////////////////////// 3166 3167 3168 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3169 ResourceMark rm(THREAD); 3170 JvmtiVMObjectAllocEventCollector oam; 3171 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3172 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3173 return (jstring) JNIHandles::make_local(THREAD, result); 3174 JVM_END 3175 3176 3177 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3178 JvmtiVMObjectAllocEventCollector oam; 3179 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3180 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3181 JVM_END 3182 3183 3184 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3185 3186 3187 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3188 MonitorLocker ml(Heap_lock); 3189 oop ref = Universe::reference_pending_list(); 3190 if (ref != nullptr) { 3191 Universe::clear_reference_pending_list(); 3192 } 3193 return JNIHandles::make_local(THREAD, ref); 3194 JVM_END 3195 3196 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3197 MonitorLocker ml(Heap_lock); 3198 return Universe::has_reference_pending_list(); 3199 JVM_END 3200 3201 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3202 MonitorLocker ml(Heap_lock); 3203 while (!Universe::has_reference_pending_list()) { 3204 ml.wait(); 3205 } 3206 JVM_END 3207 3208 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref)) 3209 oop ref_oop = JNIHandles::resolve_non_null(ref); 3210 // PhantomReference has its own implementation of get(). 3211 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3212 oop referent = java_lang_ref_Reference::weak_referent(ref_oop); 3213 return JNIHandles::make_local(THREAD, referent); 3214 JVM_END 3215 3216 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3217 oop ref_oop = JNIHandles::resolve_non_null(ref); 3218 // PhantomReference has its own implementation of refersTo(). 3219 // See: JVM_PhantomReferenceRefersTo 3220 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3221 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3222 return referent == JNIHandles::resolve(o); 3223 JVM_END 3224 3225 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3226 oop ref_oop = JNIHandles::resolve_non_null(ref); 3227 // FinalReference has it's own implementation of clear(). 3228 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3229 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3230 // If the referent has already been cleared then done. 3231 // However, if the referent is dead but has not yet been cleared by 3232 // concurrent reference processing, it should NOT be cleared here. 3233 // Instead, clearing should be left to the GC. Clearing it here could 3234 // detectably lose an expected notification, which is impossible with 3235 // STW reference processing. The clearing in enqueue() doesn't have 3236 // this problem, since the enqueue covers the notification, but it's not 3237 // worth the effort to handle that case specially. 3238 return; 3239 } 3240 java_lang_ref_Reference::clear_referent(ref_oop); 3241 JVM_END 3242 3243 3244 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3245 3246 3247 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3248 oop ref_oop = JNIHandles::resolve_non_null(ref); 3249 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3250 return referent == JNIHandles::resolve(o); 3251 JVM_END 3252 3253 3254 // ObjectInputStream /////////////////////////////////////////////////////////////// 3255 3256 // Return the first user-defined class loader up the execution stack, or null 3257 // if only code from the bootstrap or platform class loader is on the stack. 3258 3259 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3260 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3261 InstanceKlass* ik = vfst.method()->method_holder(); 3262 oop loader = ik->class_loader(); 3263 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3264 return JNIHandles::make_local(THREAD, loader); 3265 } 3266 } 3267 return nullptr; 3268 JVM_END 3269 3270 3271 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3272 3273 3274 // resolve array handle and check arguments 3275 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3276 if (arr == nullptr) { 3277 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3278 } 3279 oop a = JNIHandles::resolve_non_null(arr); 3280 if (!a->is_array()) { 3281 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3282 } else if (type_array_only && !a->is_typeArray()) { 3283 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3284 } 3285 return arrayOop(a); 3286 } 3287 3288 3289 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3290 arrayOop a = check_array(env, arr, false, CHECK_0); 3291 return a->length(); 3292 JVM_END 3293 3294 3295 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3296 JvmtiVMObjectAllocEventCollector oam; 3297 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3298 jvalue value; 3299 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3300 oop box = Reflection::box(&value, type, CHECK_NULL); 3301 return JNIHandles::make_local(THREAD, box); 3302 JVM_END 3303 3304 3305 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3306 jvalue value; 3307 value.i = 0; // to initialize value before getting used in CHECK 3308 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3309 assert(a->is_typeArray(), "just checking"); 3310 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3311 BasicType wide_type = (BasicType) wCode; 3312 if (type != wide_type) { 3313 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3314 } 3315 return value; 3316 JVM_END 3317 3318 3319 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3320 arrayOop a = check_array(env, arr, false, CHECK); 3321 oop box = JNIHandles::resolve(val); 3322 jvalue value; 3323 value.i = 0; // to initialize value before getting used in CHECK 3324 BasicType value_type; 3325 if (a->is_objArray()) { 3326 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3327 value_type = Reflection::unbox_for_regular_object(box, &value); 3328 } else { 3329 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3330 } 3331 Reflection::array_set(&value, a, index, value_type, CHECK); 3332 JVM_END 3333 3334 3335 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3336 arrayOop a = check_array(env, arr, true, CHECK); 3337 assert(a->is_typeArray(), "just checking"); 3338 BasicType value_type = (BasicType) vCode; 3339 Reflection::array_set(&v, a, index, value_type, CHECK); 3340 JVM_END 3341 3342 3343 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3344 JvmtiVMObjectAllocEventCollector oam; 3345 oop element_mirror = JNIHandles::resolve(eltClass); 3346 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3347 return JNIHandles::make_local(THREAD, result); 3348 JVM_END 3349 3350 3351 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3352 JvmtiVMObjectAllocEventCollector oam; 3353 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3354 oop element_mirror = JNIHandles::resolve(eltClass); 3355 assert(dim_array->is_typeArray(), "just checking"); 3356 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3357 return JNIHandles::make_local(THREAD, result); 3358 JVM_END 3359 3360 3361 // Library support /////////////////////////////////////////////////////////////////////////// 3362 3363 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3364 return ZipLibrary::handle(); 3365 JVM_END 3366 3367 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3368 //%note jvm_ct 3369 char ebuf[1024]; 3370 void *load_result; 3371 { 3372 ThreadToNativeFromVM ttnfvm(thread); 3373 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3374 } 3375 if (load_result == nullptr) { 3376 if (throwException) { 3377 char msg[1024]; 3378 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3379 // Since 'ebuf' may contain a string encoded using 3380 // platform encoding scheme, we need to pass 3381 // Exceptions::unsafe_to_utf8 to the new_exception method 3382 // as the last argument. See bug 6367357. 3383 Handle h_exception = 3384 Exceptions::new_exception(thread, 3385 vmSymbols::java_lang_UnsatisfiedLinkError(), 3386 msg, Exceptions::unsafe_to_utf8); 3387 3388 THROW_HANDLE_NULL(h_exception); 3389 } else { 3390 log_info(library)("Failed to load library %s", name); 3391 return load_result; 3392 } 3393 } 3394 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3395 return load_result; 3396 JVM_END 3397 3398 3399 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3400 os::dll_unload(handle); 3401 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3402 JVM_END 3403 3404 3405 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3406 void* find_result = os::dll_lookup(handle, name); 3407 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3408 find_result != nullptr ? "Found" : "Failed to find", 3409 name, p2i(handle)); 3410 return find_result; 3411 JVM_END 3412 3413 3414 // JNI version /////////////////////////////////////////////////////////////////////////////// 3415 3416 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3417 return Threads::is_supported_jni_version_including_1_1(version); 3418 JVM_END 3419 3420 3421 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3422 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3423 JVM_END 3424 3425 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3426 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3427 JVM_END 3428 3429 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void)) 3430 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE; 3431 JVM_END 3432 3433 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void)) 3434 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE; 3435 JVM_END 3436 3437 // String support /////////////////////////////////////////////////////////////////////////// 3438 3439 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3440 JvmtiVMObjectAllocEventCollector oam; 3441 if (str == nullptr) return nullptr; 3442 oop string = JNIHandles::resolve_non_null(str); 3443 oop result = StringTable::intern(string, CHECK_NULL); 3444 return (jstring) JNIHandles::make_local(THREAD, result); 3445 JVM_END 3446 3447 3448 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3449 3450 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3451 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3452 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3453 // in the safepoint protocol, thread suspension, thread interruption, or most things of that 3454 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has 3455 // shutdown. JavaThreads will be "in native" when using this API from JDK code. 3456 3457 3458 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3459 VM_Exit::block_if_vm_exited(); 3460 return new PlatformMutex(); 3461 } 3462 3463 3464 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3465 VM_Exit::block_if_vm_exited(); 3466 delete ((PlatformMutex*) mon); 3467 } 3468 3469 3470 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3471 VM_Exit::block_if_vm_exited(); 3472 ((PlatformMutex*) mon)->lock(); 3473 return 0; 3474 } 3475 3476 3477 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3478 VM_Exit::block_if_vm_exited(); 3479 ((PlatformMutex*) mon)->unlock(); 3480 } 3481 3482 3483 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3484 3485 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3486 Handle loader, jboolean throwError, TRAPS) { 3487 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL); 3488 3489 // Check if we should initialize the class 3490 if (init && klass->is_instance_klass()) { 3491 klass->initialize(CHECK_NULL); 3492 } 3493 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3494 } 3495 3496 3497 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3498 3499 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3500 Handle method_handle; 3501 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3502 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3503 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3504 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3505 assert(args() == nullptr || !args->is_flatArray(), "args are never flat"); 3506 3507 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3508 jobject res = JNIHandles::make_local(THREAD, result); 3509 if (JvmtiExport::should_post_vm_object_alloc()) { 3510 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3511 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3512 if (java_lang_Class::is_primitive(ret_type)) { 3513 // Only for primitive type vm allocates memory for java object. 3514 // See box() method. 3515 JvmtiExport::post_vm_object_alloc(thread, result); 3516 } 3517 } 3518 return res; 3519 } else { 3520 THROW_NULL(vmSymbols::java_lang_StackOverflowError()); 3521 } 3522 JVM_END 3523 3524 3525 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3526 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3527 assert(args() == nullptr || !args->is_flatArray(), "args are never flat"); 3528 oop constructor_mirror = JNIHandles::resolve(c); 3529 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3530 jobject res = JNIHandles::make_local(THREAD, result); 3531 if (JvmtiExport::should_post_vm_object_alloc()) { 3532 JvmtiExport::post_vm_object_alloc(thread, result); 3533 } 3534 return res; 3535 JVM_END 3536 3537 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3538 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3539 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3540 JVM_END 3541 3542 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3543 jclass caller, 3544 jstring interfaceMethodName, 3545 jobject factoryType, 3546 jobject interfaceMethodType, 3547 jobject implementationMember, 3548 jobject dynamicMethodType, 3549 jclass lambdaProxyClass)) 3550 #if INCLUDE_CDS 3551 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) { 3552 return; 3553 } 3554 3555 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller)); 3556 if (caller_ik->is_hidden()) { 3557 // Hidden classes not of type lambda proxy classes are currently not being archived. 3558 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3559 // registered for archiving. 3560 return; 3561 } 3562 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass)); 3563 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3564 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3565 3566 Symbol* interface_method_name = nullptr; 3567 if (interfaceMethodName != nullptr) { 3568 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3569 } 3570 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3571 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3572 3573 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3574 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3575 3576 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3577 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3578 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3579 3580 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3581 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3582 3583 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3584 interface_method_type, m, dynamic_method_type, THREAD); 3585 #endif // INCLUDE_CDS 3586 JVM_END 3587 3588 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3589 jclass caller, 3590 jstring interfaceMethodName, 3591 jobject factoryType, 3592 jobject interfaceMethodType, 3593 jobject implementationMember, 3594 jobject dynamicMethodType)) 3595 #if INCLUDE_CDS 3596 3597 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3598 implementationMember == nullptr || dynamicMethodType == nullptr) { 3599 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3600 } 3601 3602 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller)); 3603 if (!caller_ik->in_aot_cache()) { 3604 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3605 return nullptr; 3606 } 3607 3608 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3609 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3610 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3611 3612 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3613 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3614 3615 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3616 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3617 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3618 3619 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3620 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3621 3622 InstanceKlass* loaded_lambda = 3623 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3624 interface_method_type, m, dynamic_method_type, 3625 CHECK_(nullptr)); 3626 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3627 #else 3628 return nullptr; 3629 #endif // INCLUDE_CDS 3630 JVM_END 3631 3632 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3633 if (CDSConfig::is_dumping_static_archive()) { 3634 // We do this so that the default CDS archive can be deterministic. 3635 const char* release = VM_Version::vm_release(); 3636 const char* dbg_level = VM_Version::jdk_debug_level(); 3637 const char* version = VM_Version::internal_vm_info_string(); 3638 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3639 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3640 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3641 seed += (jlong)VM_Version::vm_major_version(); 3642 seed += (jlong)VM_Version::vm_minor_version(); 3643 seed += (jlong)VM_Version::vm_security_version(); 3644 seed += (jlong)VM_Version::vm_patch_version(); 3645 if (seed == 0) { // don't let this ever be zero. 3646 seed = 0x87654321; 3647 } 3648 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3649 return seed; 3650 } else { 3651 return 0; 3652 } 3653 JVM_END 3654 3655 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus()) 3656 return CDSConfig::get_status(); 3657 JVM_END 3658 3659 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3660 #if INCLUDE_CDS 3661 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity"); 3662 if (line != nullptr) { 3663 ResourceMark rm(THREAD); 3664 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3665 char* c_line = java_lang_String::as_utf8_string(h_line()); 3666 if (CDSConfig::is_dumping_dynamic_archive()) { 3667 // Note: LambdaFormInvokers::append take same format which is not 3668 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3669 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3670 } 3671 if (ClassListWriter::is_enabled()) { 3672 ClassListWriter w; 3673 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line); 3674 } 3675 } 3676 #endif // INCLUDE_CDS 3677 JVM_END 3678 3679 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3680 #if INCLUDE_CDS 3681 ResourceMark rm(THREAD); 3682 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3683 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3684 AOTMetaspace::dump_loaded_classes(file_name, THREAD); 3685 #endif // INCLUDE_CDS 3686 JVM_END 3687 3688 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3689 #if INCLUDE_CDS 3690 ResourceMark rm(THREAD); 3691 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3692 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3693 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3694 #endif // INCLUDE_CDS 3695 JVM_END 3696 3697 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls)) 3698 #if INCLUDE_CDS 3699 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3700 if (!k->is_instance_klass()) { 3701 return false; 3702 } else { 3703 if (InstanceKlass::cast(k)->is_enum_subclass() || 3704 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) { 3705 // This class will be cached in AOT-initialized state. No need for init barriers. 3706 return false; 3707 } else { 3708 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles 3709 // must emit barriers to ensure class initialization during production run. 3710 ResourceMark rm(THREAD); 3711 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name()); 3712 return true; 3713 } 3714 } 3715 #else 3716 return false; 3717 #endif // INCLUDE_CDS 3718 JVM_END 3719 3720 // Returns an array of all live Thread objects (VM internal JavaThreads, 3721 // jvmti agent threads, and JNI attaching threads are skipped) 3722 // See CR 6404306 regarding JNI attaching threads 3723 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3724 ResourceMark rm(THREAD); 3725 ThreadsListEnumerator tle(THREAD, false, false); 3726 JvmtiVMObjectAllocEventCollector oam; 3727 3728 int num_threads = tle.num_threads(); 3729 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3730 objArrayHandle threads_ah(THREAD, r); 3731 3732 for (int i = 0; i < num_threads; i++) { 3733 Handle h = tle.get_threadObj(i); 3734 threads_ah->obj_at_put(i, h()); 3735 } 3736 3737 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3738 JVM_END 3739 3740 3741 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3742 // Return StackTraceElement[][], each element is the stack trace of a thread in 3743 // the corresponding entry in the given threads array 3744 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3745 JvmtiVMObjectAllocEventCollector oam; 3746 3747 // Check if threads is null 3748 if (threads == nullptr) { 3749 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3750 } 3751 3752 refArrayOop a = oop_cast<refArrayOop>(JNIHandles::resolve_non_null(threads)); 3753 refArrayHandle ah(THREAD, a); 3754 int num_threads = ah->length(); 3755 // check if threads is non-empty array 3756 if (num_threads == 0) { 3757 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3758 } 3759 3760 // check if threads is not an array of objects of Thread class 3761 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3762 if (k != vmClasses::Thread_klass()) { 3763 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3764 } 3765 3766 ResourceMark rm(THREAD); 3767 3768 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3769 for (int i = 0; i < num_threads; i++) { 3770 oop thread_obj = ah->obj_at(i); 3771 instanceHandle h(THREAD, (instanceOop) thread_obj); 3772 thread_handle_array->append(h); 3773 } 3774 3775 // The JavaThread references in thread_handle_array are validated 3776 // in VM_ThreadDump::doit(). 3777 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3778 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3779 3780 JVM_END 3781 3782 // JVM monitoring and management support 3783 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3784 return Management::get_jmm_interface(version); 3785 JVM_END 3786 3787 // com.sun.tools.attach.VirtualMachine agent properties support 3788 // 3789 // Initialize the agent properties with the properties maintained in the VM 3790 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3791 ResourceMark rm; 3792 3793 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3794 3795 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3796 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3797 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3798 return properties; 3799 JVM_END 3800 3801 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3802 { 3803 JvmtiVMObjectAllocEventCollector oam; 3804 3805 if (ofClass == nullptr) { 3806 return nullptr; 3807 } 3808 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3809 // Special handling for primitive objects 3810 if (java_lang_Class::is_primitive(mirror())) { 3811 return nullptr; 3812 } 3813 Klass* k = java_lang_Class::as_Klass(mirror()); 3814 if (!k->is_instance_klass()) { 3815 return nullptr; 3816 } 3817 InstanceKlass* ik = InstanceKlass::cast(k); 3818 int encl_method_class_idx = ik->enclosing_method_class_index(); 3819 if (encl_method_class_idx == 0) { 3820 return nullptr; 3821 } 3822 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3823 objArrayHandle dest(THREAD, dest_o); 3824 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3825 dest->obj_at_put(0, enc_k->java_mirror()); 3826 int encl_method_method_idx = ik->enclosing_method_method_index(); 3827 if (encl_method_method_idx != 0) { 3828 Symbol* sym = ik->constants()->symbol_at( 3829 extract_low_short_from_int( 3830 ik->constants()->name_and_type_at(encl_method_method_idx))); 3831 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3832 dest->obj_at_put(1, str()); 3833 sym = ik->constants()->symbol_at( 3834 extract_high_short_from_int( 3835 ik->constants()->name_and_type_at(encl_method_method_idx))); 3836 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3837 dest->obj_at_put(2, str()); 3838 } 3839 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3840 } 3841 JVM_END 3842 3843 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3844 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3845 ResourceMark rm(THREAD); 3846 3847 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3848 return nullptr; 3849 } 3850 3851 char** vm_flags = Arguments::jvm_flags_array(); 3852 char** vm_args = Arguments::jvm_args_array(); 3853 int num_flags = Arguments::num_jvm_flags(); 3854 int num_args = Arguments::num_jvm_args(); 3855 3856 InstanceKlass* ik = vmClasses::String_klass(); 3857 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3858 objArrayHandle result_h(THREAD, r); 3859 3860 int index = 0; 3861 for (int j = 0; j < num_flags; j++, index++) { 3862 stringStream prefixed; 3863 prefixed.print("-XX:%s", vm_flags[j]); 3864 Handle h = java_lang_String::create_from_platform_dependent_str(prefixed.base(), CHECK_NULL); 3865 result_h->obj_at_put(index, h()); 3866 } 3867 for (int i = 0; i < num_args; i++, index++) { 3868 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3869 result_h->obj_at_put(index, h()); 3870 } 3871 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 3872 JVM_END 3873 3874 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 3875 return os::get_signal_number(name); 3876 JVM_END 3877 3878 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread)) 3879 oop vt = JNIHandles::resolve_external_guard(vthread); 3880 MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/); 3881 JVM_END 3882 3883 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread)) 3884 oop vt = JNIHandles::resolve_external_guard(vthread); 3885 MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/); 3886 JVM_END 3887 3888 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount)) 3889 oop vt = JNIHandles::resolve_external_guard(vthread); 3890 MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/); 3891 JVM_END 3892 3893 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount)) 3894 oop vt = JNIHandles::resolve_external_guard(vthread); 3895 MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/); 3896 JVM_END 3897 3898 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section. 3899 // Needed to avoid deadlocks with JVMTI suspend mechanism. 3900 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter)) 3901 #if INCLUDE_JVMTI 3902 if (!DoJVMTIVirtualThreadTransitions) { 3903 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3904 return; 3905 } 3906 assert(thread->is_disable_suspend() != (bool)enter, 3907 "nested or unbalanced monitor enter/exit is not allowed"); 3908 thread->toggle_is_disable_suspend(); 3909 #endif 3910 JVM_END 3911 3912 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op)) 3913 #if INCLUDE_JFR 3914 freeze_result result = THREAD->last_freeze_fail_result(); 3915 assert(result != freeze_ok, "sanity check"); 3916 EventVirtualThreadPinned event(UNTIMED); 3917 event.set_starttime(THREAD->last_freeze_fail_time()); 3918 if (event.should_commit()) { 3919 ResourceMark rm(THREAD); 3920 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op)); 3921 THREAD->post_vthread_pinned_event(&event, str, result); 3922 } 3923 #endif 3924 JVM_END 3925 3926 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored)) 3927 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent(); 3928 assert(parkEvent != nullptr, "not initialized"); 3929 3930 OopHandle& list_head = ObjectMonitor::vthread_list_head(); 3931 oop vthread_head = nullptr; 3932 while (true) { 3933 if (list_head.peek() != nullptr) { 3934 for (;;) { 3935 oop head = list_head.resolve(); 3936 if (list_head.cmpxchg(head, nullptr) == head) { 3937 return JNIHandles::make_local(THREAD, head); 3938 } 3939 } 3940 } 3941 ThreadBlockInVM tbivm(THREAD); 3942 parkEvent->park(); 3943 } 3944 JVM_END 3945 3946 /* 3947 * Return the current class's class file version. The low order 16 bits of the 3948 * returned jint contain the class's major version. The high order 16 bits 3949 * contain the class's minor version. 3950 */ 3951 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 3952 oop mirror = JNIHandles::resolve_non_null(current); 3953 if (java_lang_Class::is_primitive(mirror)) { 3954 // return latest major version and minor version of 0. 3955 return JVM_CLASSFILE_MAJOR_VERSION; 3956 } 3957 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 3958 return (ik->minor_version() << 16) | ik->major_version(); 3959 JVM_END 3960 3961 /* 3962 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 3963 * get the value will see a materialized value and not a scalar-replaced 3964 * null value. 3965 */ 3966 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 3967 JVM_EnsureMaterializedForStackWalk(env, value); 3968 JVM_END 3969 3970 /* 3971 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded. 3972 */ 3973 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void)) 3974 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE; 3975 JVM_END --- EOF ---