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/instanceKlass.hpp" 63 #include "oops/klass.inline.hpp" 64 #include "oops/method.hpp" 65 #include "oops/objArrayKlass.hpp" 66 #include "oops/objArrayOop.inline.hpp" 67 #include "oops/oop.inline.hpp" 68 #include "oops/recordComponent.hpp" 69 #include "oops/refArrayOop.inline.hpp" 70 #include "prims/foreignGlobals.hpp" 71 #include "prims/jvm_misc.hpp" 72 #include "prims/jvmtiExport.hpp" 73 #include "prims/jvmtiThreadState.inline.hpp" 74 #include "prims/stackwalk.hpp" 75 #include "runtime/arguments.hpp" 76 #include "runtime/atomicAccess.hpp" 77 #include "runtime/continuation.hpp" 78 #include "runtime/deoptimization.hpp" 79 #include "runtime/globals_extension.hpp" 80 #include "runtime/handles.inline.hpp" 81 #include "runtime/handshake.hpp" 82 #include "runtime/init.hpp" 83 #include "runtime/interfaceSupport.inline.hpp" 84 #include "runtime/java.hpp" 85 #include "runtime/javaCalls.hpp" 86 #include "runtime/javaThread.hpp" 87 #include "runtime/jfieldIDWorkaround.hpp" 88 #include "runtime/jniHandles.inline.hpp" 89 #include "runtime/mountUnmountDisabler.hpp" 90 #include "runtime/os.inline.hpp" 91 #include "runtime/osThread.hpp" 92 #include "runtime/perfData.hpp" 93 #include "runtime/reflection.hpp" 94 #include "runtime/synchronizer.hpp" 95 #include "runtime/threadIdentifier.hpp" 96 #include "runtime/threadSMR.hpp" 97 #include "runtime/vframe.inline.hpp" 98 #include "runtime/vm_version.hpp" 99 #include "runtime/vmOperations.hpp" 100 #include "services/attachListener.hpp" 101 #include "services/management.hpp" 102 #include "services/threadService.hpp" 103 #include "utilities/checkedCast.hpp" 104 #include "utilities/copy.hpp" 105 #include "utilities/defaultStream.hpp" 106 #include "utilities/dtrace.hpp" 107 #include "utilities/events.hpp" 108 #include "utilities/macros.hpp" 109 #include "utilities/utf8.hpp" 110 #include "utilities/zipLibrary.hpp" 111 #if INCLUDE_CDS 112 #include "classfile/systemDictionaryShared.hpp" 113 #endif 114 #if INCLUDE_JFR 115 #include "jfr/jfr.hpp" 116 #endif 117 #if INCLUDE_MANAGEMENT 118 #include "services/finalizerService.hpp" 119 #endif 120 121 #include <errno.h> 122 123 /* 124 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 125 such ctors and calls MUST NOT come between an oop declaration/init and its 126 usage because if objects are move this may cause various memory stomps, bus 127 errors and segfaults. Here is a cookbook for causing so called "naked oop 128 failures": 129 130 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 131 // Object address to be held directly in mirror & not visible to GC 132 oop mirror = JNIHandles::resolve_non_null(ofClass); 133 134 // If this ctor can hit a safepoint, moving objects around, then 135 ComplexConstructor foo; 136 137 // Boom! mirror may point to JUNK instead of the intended object 138 (some dereference of mirror) 139 140 // Here's another call that may block for GC, making mirror stale 141 MutexLocker ml(some_lock); 142 143 // And here's an initializer that can result in a stale oop 144 // all in one step. 145 oop o = call_that_can_throw_exception(TRAPS); 146 147 148 The solution is to keep the oop declaration BELOW the ctor or function 149 call that might cause a GC, do another resolve to reassign the oop, or 150 consider use of a Handle instead of an oop so there is immunity from object 151 motion. But note that the "QUICK" entries below do not have a handlemark 152 and thus can only support use of handles passed in. 153 */ 154 155 extern void trace_class_resolution(Klass* to_class) { 156 ResourceMark rm; 157 int line_number = -1; 158 const char * source_file = nullptr; 159 const char * trace = "explicit"; 160 InstanceKlass* caller = nullptr; 161 JavaThread* jthread = JavaThread::current(); 162 if (jthread->has_last_Java_frame()) { 163 vframeStream vfst(jthread); 164 165 // Scan up the stack skipping ClassLoader frames. 166 Method* last_caller = nullptr; 167 168 while (!vfst.at_end()) { 169 Method* m = vfst.method(); 170 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) { 171 break; 172 } 173 last_caller = m; 174 vfst.next(); 175 } 176 // if this is called from Class.forName0 and that is called from Class.forName, 177 // then print the caller of Class.forName. If this is Class.loadClass, then print 178 // that caller, otherwise keep quiet since this should be picked up elsewhere. 179 bool found_it = false; 180 if (!vfst.at_end() && 181 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 182 vfst.method()->name() == vmSymbols::forName0_name()) { 183 vfst.next(); 184 if (!vfst.at_end() && 185 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 186 vfst.method()->name() == vmSymbols::forName_name()) { 187 vfst.next(); 188 found_it = true; 189 } 190 } else if (last_caller != nullptr && 191 last_caller->method_holder()->name() == 192 vmSymbols::java_lang_ClassLoader() && 193 last_caller->name() == vmSymbols::loadClass_name()) { 194 found_it = true; 195 } else if (!vfst.at_end()) { 196 if (vfst.method()->is_native()) { 197 // JNI call 198 found_it = true; 199 } 200 } 201 if (found_it && !vfst.at_end()) { 202 // found the caller 203 caller = vfst.method()->method_holder(); 204 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 205 if (line_number == -1) { 206 // show method name if it's a native method 207 trace = vfst.method()->name_and_sig_as_C_string(); 208 } 209 Symbol* s = caller->source_file_name(); 210 if (s != nullptr) { 211 source_file = s->as_C_string(); 212 } 213 } 214 } 215 if (caller != nullptr) { 216 if (to_class != caller) { 217 const char * from = caller->external_name(); 218 const char * to = to_class->external_name(); 219 // print in a single call to reduce interleaving between threads 220 if (source_file != nullptr) { 221 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 222 } else { 223 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 224 } 225 } 226 } 227 } 228 229 // java.lang.System ////////////////////////////////////////////////////////////////////// 230 231 JVM_ENTRY(jboolean, JVM_AOTEndRecording(JNIEnv *env)) 232 #if INCLUDE_CDS 233 if (CDSConfig::is_dumping_preimage_static_archive()) { 234 if (!AOTMetaspace::preimage_static_archive_dumped()) { 235 AOTMetaspace::dump_static_archive(THREAD); 236 return JNI_TRUE; 237 } 238 } 239 return JNI_FALSE; 240 #else 241 return JNI_FALSE; 242 #endif // INCLUDE_CDS 243 JVM_END 244 245 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 246 return os::javaTimeMillis(); 247 JVM_END 248 249 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 250 return os::javaTimeNanos(); 251 JVM_END 252 253 // The function below is actually exposed by jdk.internal.misc.VM and not 254 // java.lang.System, but we choose to keep it here so that it stays next 255 // to JVM_CurrentTimeMillis and JVM_NanoTime 256 257 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 258 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 259 260 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 261 jlong seconds; 262 jlong nanos; 263 264 os::javaTimeSystemUTC(seconds, nanos); 265 266 // We're going to verify that the result can fit in a long. 267 // For that we need the difference in seconds between 'seconds' 268 // and 'offset_secs' to be such that: 269 // |seconds - offset_secs| < (2^63/10^9) 270 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 271 // which makes |seconds - offset_secs| < 2^33 272 // and we will prefer +/- 2^32 as the maximum acceptable diff 273 // as 2^32 has a more natural feel than 2^33... 274 // 275 // So if |seconds - offset_secs| >= 2^32 - we return a special 276 // sentinel value (-1) which the caller should take as an 277 // exception value indicating that the offset given to us is 278 // too far from range of the current time - leading to too big 279 // a nano adjustment. The caller is expected to recover by 280 // computing a more accurate offset and calling this method 281 // again. (For the record 2^32 secs is ~136 years, so that 282 // should rarely happen) 283 // 284 jlong diff = seconds - offset_secs; 285 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 286 return -1; // sentinel value: the offset is too far off the target 287 } 288 289 // return the adjustment. If you compute a time by adding 290 // this number of nanoseconds along with the number of seconds 291 // in the offset you should get the current UTC time. 292 return (diff * (jlong)1000000000) + nanos; 293 JVM_END 294 295 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 296 jobject dst, jint dst_pos, jint length)) 297 // Check if we have null pointers 298 if (src == nullptr || dst == nullptr) { 299 THROW(vmSymbols::java_lang_NullPointerException()); 300 } 301 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 302 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 303 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 304 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 305 // Do copy 306 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 307 JVM_END 308 309 310 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 311 JavaValue r(T_OBJECT); 312 // public synchronized Object put(Object key, Object value); 313 HandleMark hm(THREAD); 314 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 315 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK); 316 JavaCalls::call_virtual(&r, 317 props, 318 vmClasses::Properties_klass(), 319 vmSymbols::put_name(), 320 vmSymbols::object_object_object_signature(), 321 key_str, 322 value_str, 323 THREAD); 324 } 325 326 327 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 328 329 /* 330 * Return all of the system properties in a Java String array with alternating 331 * names and values from the jvm SystemProperty. 332 * Which includes some internal and all commandline -D defined properties. 333 */ 334 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 335 ResourceMark rm(THREAD); 336 HandleMark hm(THREAD); 337 int ndx = 0; 338 int fixedCount = 2; 339 340 SystemProperty* p = Arguments::system_properties(); 341 int count = Arguments::PropertyList_count(p); 342 343 // Allocate result String array 344 InstanceKlass* ik = vmClasses::String_klass(); 345 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 346 objArrayHandle result_h(THREAD, r); 347 348 while (p != nullptr) { 349 const char * key = p->key(); 350 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 351 const char * value = p->value(); 352 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 353 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL); 354 result_h->obj_at_put(ndx * 2, key_str()); 355 result_h->obj_at_put(ndx * 2 + 1, value_str()); 356 ndx++; 357 } 358 p = p->next(); 359 } 360 361 // Convert the -XX:MaxDirectMemorySize= command line flag 362 // to the sun.nio.MaxDirectMemorySize property. 363 // Do this after setting user properties to prevent people 364 // from setting the value with a -D option, as requested. 365 // Leave empty if not supplied 366 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 367 char as_chars[256]; 368 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 369 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 370 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 371 result_h->obj_at_put(ndx * 2, key_str()); 372 result_h->obj_at_put(ndx * 2 + 1, value_str()); 373 ndx++; 374 } 375 376 // JVM monitoring and management support 377 // Add the sun.management.compiler property for the compiler's name 378 { 379 #undef CSIZE 380 #if defined(_LP64) 381 #define CSIZE "64-Bit " 382 #else 383 #define CSIZE 384 #endif // 64bit 385 386 #if COMPILER1_AND_COMPILER2 387 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 388 #else 389 #if defined(COMPILER1) 390 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 391 #elif defined(COMPILER2) 392 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 393 #elif INCLUDE_JVMCI 394 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2" 395 #else 396 const char* compiler_name = ""; 397 #endif // compilers 398 #endif // COMPILER1_AND_COMPILER2 399 400 if (*compiler_name != '\0' && 401 (Arguments::mode() != Arguments::_int)) { 402 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 403 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 404 result_h->obj_at_put(ndx * 2, key_str()); 405 result_h->obj_at_put(ndx * 2 + 1, value_str()); 406 ndx++; 407 } 408 } 409 410 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 411 JVM_END 412 413 414 /* 415 * Return the temporary directory that the VM uses for the attach 416 * and perf data files. 417 * 418 * It is important that this directory is well-known and the 419 * same for all VM instances. It cannot be affected by configuration 420 * variables such as java.io.tmpdir. 421 */ 422 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 423 HandleMark hm(THREAD); 424 const char* temp_dir = os::get_temp_directory(); 425 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 426 return (jstring) JNIHandles::make_local(THREAD, h()); 427 JVM_END 428 429 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) { 430 if (len < 0) { 431 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative"); 432 } 433 elmClass->initialize(CHECK); 434 if (elmClass->is_array_klass() || elmClass->is_identity_class()) { 435 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class"); 436 } 437 if (elmClass->is_abstract()) { 438 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract"); 439 } 440 } 441 442 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to)) 443 oop o = JNIHandles::resolve_non_null(orig); 444 assert(o->is_array(), "Must be"); 445 oop array = nullptr; 446 arrayOop org = (arrayOop)o; 447 arrayHandle oh(THREAD, org); 448 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass()); 449 InlineKlass* vk = InlineKlass::cast(ak->element_klass()); 450 int len = to - from; // length of the new array 451 if (ak->is_null_free_array_klass()) { 452 if ((len != 0) && (from >= org->length() || to > org->length())) { 453 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements"); 454 } 455 } 456 if (org->is_flatArray()) { 457 FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass()); 458 LayoutKind lk = fak->layout_kind(); 459 ArrayKlass::ArrayProperties props = ArrayKlass::array_properties_from_layout(lk); 460 array = oopFactory::new_flatArray(vk, len, props, lk, CHECK_NULL); 461 arrayHandle ah(THREAD, (arrayOop)array); 462 int end = to < oh()->length() ? to : oh()->length(); 463 for (int i = from; i < end; i++) { 464 void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper()); 465 void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper()); 466 vk->copy_payload_to_addr(src, dst, lk); 467 } 468 array = ah(); 469 } else { 470 ArrayKlass::ArrayProperties props = org->is_null_free_array() ? ArrayKlass::ArrayProperties::NULL_RESTRICTED : ArrayKlass::ArrayProperties::DEFAULT; 471 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL); 472 int end = to < oh()->length() ? to : oh()->length(); 473 for (int i = from; i < end; i++) { 474 if (i < ((objArrayOop)oh())->length()) { 475 ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i)); 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 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal)) 486 oop mirror = JNIHandles::resolve_non_null(elmClass); 487 oop init = JNIHandles::resolve(initVal); 488 if (init == nullptr) { 489 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null"); 490 } 491 Handle init_h(THREAD, init); 492 Klass* klass = java_lang_Class::as_Klass(mirror); 493 if (klass != init_h()->klass()) { 494 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value"); 495 } 496 validate_array_arguments(klass, len, CHECK_NULL); 497 InlineKlass* vk = InlineKlass::cast(klass); 498 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NON_ATOMIC | ArrayKlass::ArrayProperties::NULL_RESTRICTED); 499 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL); 500 for (int i = 0; i < len; i++) { 501 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ ); 502 } 503 return (jarray) JNIHandles::make_local(THREAD, array); 504 JVM_END 505 506 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal)) 507 oop mirror = JNIHandles::resolve_non_null(elmClass); 508 oop init = JNIHandles::resolve(initVal); 509 if (init == nullptr) { 510 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null"); 511 } 512 Handle init_h(THREAD, init); 513 Klass* klass = java_lang_Class::as_Klass(mirror); 514 if (klass != init_h()->klass()) { 515 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value"); 516 } 517 validate_array_arguments(klass, len, CHECK_NULL); 518 InlineKlass* vk = InlineKlass::cast(klass); 519 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::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 oop mirror = JNIHandles::resolve_non_null(elmClass); 529 Klass* klass = java_lang_Class::as_Klass(mirror); 530 klass->initialize(CHECK_NULL); 531 validate_array_arguments(klass, len, CHECK_NULL); 532 InlineKlass* vk = InlineKlass::cast(klass); 533 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::DEFAULT); 534 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL); 535 return (jarray) JNIHandles::make_local(THREAD, array); 536 JVM_END 537 538 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj)) 539 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj)); 540 return oop->is_flatArray(); 541 JVM_END 542 543 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj)) 544 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj)); 545 return oop->is_null_free_array(); 546 JVM_END 547 548 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj)) 549 // There are multiple cases where an array can/must support atomic access: 550 // - the array is a reference array 551 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or NULL_FREE_ATOMIC_FLAT 552 // - the array is flat and its component type is naturally atomic 553 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj)); 554 if (oop->is_refArray()) return true; 555 if (oop->is_flatArray()) { 556 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass()); 557 if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) return true; 558 if (fak->element_klass()->is_naturally_atomic()) return true; 559 } 560 return false; 561 JVM_END 562 563 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 564 565 extern volatile jint vm_created; 566 567 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 568 EventShutdown event; 569 if (event.should_commit()) { 570 event.set_reason("Shutdown requested from Java"); 571 event.commit(); 572 } 573 JVM_END 574 575 576 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 577 before_exit(thread, true); 578 vm_exit(code); 579 JVM_END 580 581 582 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 583 if (!DisableExplicitGC) { 584 EventSystemGC event; 585 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent); 586 Universe::heap()->collect(GCCause::_java_lang_system_gc); 587 event.commit(); 588 } 589 JVM_END 590 591 592 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 593 return Universe::heap()->millis_since_last_whole_heap_examined(); 594 JVM_END 595 596 597 static inline jlong convert_size_t_to_jlong(size_t val) { 598 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 599 NOT_LP64 (return (jlong)val;) 600 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 601 } 602 603 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 604 size_t n = Universe::heap()->capacity(); 605 return convert_size_t_to_jlong(n); 606 JVM_END 607 608 609 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 610 size_t n = Universe::heap()->unused(); 611 return convert_size_t_to_jlong(n); 612 JVM_END 613 614 615 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 616 size_t n = Universe::heap()->max_capacity(); 617 return convert_size_t_to_jlong(n); 618 JVM_END 619 620 621 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 622 return os::active_processor_count(); 623 JVM_END 624 625 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void)) 626 #ifdef LINUX 627 if (UseContainerSupport) { 628 return JNI_TRUE; 629 } 630 #endif 631 return JNI_FALSE; 632 JVM_END 633 634 JVM_LEAF(jboolean, JVM_IsContainerized(void)) 635 if (os::is_containerized()) { 636 return JNI_TRUE; 637 } 638 return JNI_FALSE; 639 JVM_END 640 641 // java.lang.Throwable ////////////////////////////////////////////////////// 642 643 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 644 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 645 java_lang_Throwable::fill_in_stack_trace(exception); 646 JVM_END 647 648 // java.lang.NullPointerException /////////////////////////////////////////// 649 650 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 651 if (!ShowCodeDetailsInExceptionMessages) return nullptr; 652 653 oop exc = JNIHandles::resolve_non_null(throwable); 654 655 Method* method; 656 int bci; 657 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 658 return nullptr; 659 } 660 if (method->is_native()) { 661 return nullptr; 662 } 663 664 stringStream ss; 665 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 666 if (ok) { 667 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 668 return (jstring) JNIHandles::make_local(THREAD, result); 669 } else { 670 return nullptr; 671 } 672 JVM_END 673 674 // java.lang.StackTraceElement ////////////////////////////////////////////// 675 676 677 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth)) 678 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace)); 679 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 680 objArrayHandle stack_trace(THREAD, st); 681 // Fill in the allocated stack trace 682 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK); 683 JVM_END 684 685 686 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 687 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 688 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 689 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK); 690 JVM_END 691 692 693 // java.lang.StackWalker ////////////////////////////////////////////////////// 694 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj)) 695 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj)); 696 697 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr); 698 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr); 699 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info()); 700 if (!have_name) { 701 oop name = StringTable::intern(method->name(), CHECK); 702 java_lang_StackFrameInfo::set_name(stack_frame_info(), name); 703 } 704 if (!have_type) { 705 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK); 706 java_lang_StackFrameInfo::set_type(stack_frame_info(), type()); 707 } 708 JVM_END 709 710 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode, 711 jint skip_frames, jobject contScope, jobject cont, 712 jint buffer_size, jint start_index, jobjectArray frames)) 713 if (!thread->has_last_Java_frame()) { 714 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr); 715 } 716 717 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 718 Handle contScope_h(THREAD, JNIHandles::resolve(contScope)); 719 Handle cont_h(THREAD, JNIHandles::resolve(cont)); 720 // frames array is a ClassFrameInfo[] array when only getting caller reference, 721 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 722 // be null. 723 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 724 objArrayHandle frames_array_h(THREAD, fa); 725 726 if (frames_array_h->length() < buffer_size) { 727 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr); 728 } 729 730 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h, 731 buffer_size, start_index, frames_array_h, CHECK_NULL); 732 return JNIHandles::make_local(THREAD, result); 733 JVM_END 734 735 736 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor, 737 jint last_batch_count, jint buffer_size, jint start_index, 738 jobjectArray frames)) 739 // frames array is a ClassFrameInfo[] array when only getting caller reference, 740 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 741 // be null. 742 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 743 objArrayHandle frames_array_h(THREAD, fa); 744 745 if (frames_array_h->length() < buffer_size) { 746 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 747 } 748 749 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 750 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size, 751 start_index, frames_array_h, THREAD); 752 JVM_END 753 754 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont)) 755 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 756 objArrayHandle frames_array_h(THREAD, fa); 757 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 758 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont)); 759 760 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD); 761 JVM_END 762 763 // java.lang.Object /////////////////////////////////////////////// 764 765 766 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 767 // as implemented in the classic virtual machine; return 0 if object is null 768 if (handle == nullptr) { 769 return 0; 770 } 771 oop obj = JNIHandles::resolve_non_null(handle); 772 if (Arguments::is_valhalla_enabled() && obj->klass()->is_inline_klass()) { 773 // Check if mark word contains hash code already 774 intptr_t hash = obj->mark().hash(); 775 if (hash != markWord::no_hash) { 776 return checked_cast<jint>(hash); 777 } 778 779 // Compute hash by calling ValueObjectMethods.valueObjectHashCode 780 JavaValue result(T_INT); 781 JavaCallArguments args; 782 Handle ho(THREAD, obj); 783 args.push_oop(ho); 784 methodHandle method(THREAD, Universe::value_object_hash_code_method()); 785 JavaCalls::call(&result, method, &args, THREAD); 786 if (HAS_PENDING_EXCEPTION) { 787 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) { 788 Handle e(THREAD, PENDING_EXCEPTION); 789 CLEAR_PENDING_EXCEPTION; 790 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false); 791 } 792 } 793 hash = result.get_jint(); 794 795 // Store hash in the mark word 796 markWord old_mark, new_mark, test; 797 do { 798 old_mark = ho->mark(); 799 new_mark = old_mark.copy_set_hash(hash); 800 test = ho->cas_set_mark(new_mark, old_mark); 801 } while (test != old_mark); 802 803 return checked_cast<jint>(new_mark.hash()); 804 } else { 805 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj)); 806 } 807 JVM_END 808 809 810 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 811 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 812 ObjectSynchronizer::wait(obj, ms, CHECK); 813 JVM_END 814 815 816 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 817 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 818 ObjectSynchronizer::notify(obj, CHECK); 819 JVM_END 820 821 822 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 823 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 824 ObjectSynchronizer::notifyall(obj, CHECK); 825 JVM_END 826 827 828 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 829 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 830 Klass* klass = obj->klass(); 831 JvmtiVMObjectAllocEventCollector oam; 832 833 #ifdef ASSERT 834 // Just checking that the cloneable flag is set correct 835 if (obj->is_array()) { 836 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 837 } else { 838 guarantee(obj->is_instance(), "should be instanceOop"); 839 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 840 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 841 } 842 #endif 843 844 // Check if class of obj supports the Cloneable interface. 845 // All arrays are considered to be cloneable (See JLS 20.1.5). 846 // All j.l.r.Reference classes are considered non-cloneable. 847 if (!klass->is_cloneable() || 848 (klass->is_instance_klass() && 849 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 850 ResourceMark rm(THREAD); 851 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 852 } 853 854 if (klass->is_inline_klass()) { 855 // Value instances have no identity, so return the current instance instead of allocating a new one 856 // Value classes cannot have finalizers, so the method can return immediately 857 return JNIHandles::make_local(THREAD, obj()); 858 } 859 860 // Make shallow object copy 861 const size_t size = obj->size(); 862 oop new_obj_oop = nullptr; 863 if (obj->is_array()) { 864 const int length = ((arrayOop)obj())->length(); 865 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 866 /* do_zero */ true, CHECK_NULL); 867 } else { 868 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 869 } 870 871 HeapAccess<>::clone(obj(), new_obj_oop, size); 872 873 Handle new_obj(THREAD, new_obj_oop); 874 // Caution: this involves a java upcall, so the clone should be 875 // "gc-robust" by this stage. 876 if (klass->has_finalizer()) { 877 assert(obj->is_instance(), "should be instanceOop"); 878 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 879 new_obj = Handle(THREAD, new_obj_oop); 880 } 881 882 return JNIHandles::make_local(THREAD, new_obj()); 883 JVM_END 884 885 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 886 887 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 888 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 889 JVM_END 890 891 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 892 return InstanceKlass::is_finalization_enabled(); 893 JVM_END 894 895 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 896 897 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 898 CONT_RegisterNativeMethods(env, cls); 899 JVM_END 900 901 // java.io.File /////////////////////////////////////////////////////////////// 902 903 JVM_LEAF(char*, JVM_NativePath(char* path)) 904 return os::native_path(path); 905 JVM_END 906 907 908 // Misc. class handling /////////////////////////////////////////////////////////// 909 910 911 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 912 // Getting the class of the caller frame. 913 // 914 // The call stack at this point looks something like this: 915 // 916 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ] 917 // [1] [ @CallerSensitive API.method ] 918 // [.] [ (skipped intermediate frames) ] 919 // [n] [ caller ] 920 vframeStream vfst(thread); 921 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 922 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 923 Method* m = vfst.method(); 924 assert(m != nullptr, "sanity"); 925 switch (n) { 926 case 0: 927 // This must only be called from Reflection.getCallerClass 928 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 929 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 930 } 931 // fall-through 932 case 1: 933 // Frame 0 and 1 must be caller sensitive. 934 if (!m->caller_sensitive()) { 935 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 936 } 937 break; 938 default: 939 if (!m->is_ignored_by_security_stack_walk()) { 940 // We have reached the desired frame; return the holder class. 941 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 942 } 943 break; 944 } 945 } 946 return nullptr; 947 JVM_END 948 949 950 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 951 oop mirror = nullptr; 952 BasicType t = name2type(utf); 953 if (t != T_ILLEGAL && !is_reference_type(t)) { 954 mirror = Universe::java_mirror(t); 955 } 956 if (mirror == nullptr) { 957 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 958 } else { 959 return (jclass) JNIHandles::make_local(THREAD, mirror); 960 } 961 JVM_END 962 963 964 // Returns a class loaded by the bootstrap class loader; or null 965 // if not found. ClassNotFoundException is not thrown. 966 // FindClassFromBootLoader is exported to the launcher for windows. 967 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 968 const char* name)) 969 // Java libraries should ensure that name is never null or illegal. 970 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 971 // It's impossible to create this class; the name cannot fit 972 // into the constant pool. 973 return nullptr; 974 } 975 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name"); 976 977 TempNewSymbol h_name = SymbolTable::new_symbol(name); 978 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 979 if (k == nullptr) { 980 return nullptr; 981 } 982 983 if (log_is_enabled(Debug, class, resolve)) { 984 trace_class_resolution(k); 985 } 986 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 987 JVM_END 988 989 // Find a class with this name in this loader. 990 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name, 991 jboolean init, jobject loader)) 992 TempNewSymbol h_name = 993 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 994 CHECK_NULL); 995 996 oop loader_oop = JNIHandles::resolve(loader); 997 Handle h_loader(THREAD, loader_oop); 998 999 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 1000 false, THREAD); 1001 1002 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1003 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 1004 } 1005 return result; 1006 JVM_END 1007 1008 // Currently only called from the old verifier. 1009 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 1010 jboolean init, jclass from)) 1011 TempNewSymbol h_name = 1012 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 1013 CHECK_NULL); 1014 oop from_class_oop = JNIHandles::resolve(from); 1015 assert(from_class_oop != nullptr, "must be"); 1016 Klass* from_class = java_lang_Class::as_Klass(from_class_oop); 1017 assert(from_class != nullptr, "must be"); 1018 oop class_loader = from_class->class_loader(); 1019 1020 Handle h_loader(THREAD, class_loader); 1021 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread); 1022 1023 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1024 // this function is generally only used for class loading during verification. 1025 ResourceMark rm; 1026 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name(); 1027 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name(); 1028 log_debug(class, resolve)("%s %s (verification)", from_name, to_name); 1029 } 1030 1031 #if INCLUDE_CDS 1032 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) { 1033 InstanceKlass* ik = InstanceKlass::cast(from_class); 1034 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name); 1035 } 1036 #endif 1037 1038 return result; 1039 JVM_END 1040 1041 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 1042 static jclass jvm_define_class_common(const char *name, 1043 jobject loader, const jbyte *buf, 1044 jsize len, jobject pd, const char *source, 1045 TRAPS) { 1046 if (source == nullptr) source = "__JVM_DefineClass__"; 1047 1048 JavaThread* jt = THREAD; 1049 1050 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 1051 ClassLoader::perf_define_appclass_selftime(), 1052 ClassLoader::perf_define_appclasses(), 1053 jt->get_thread_stat()->perf_recursion_counts_addr(), 1054 jt->get_thread_stat()->perf_timers_addr(), 1055 PerfClassTraceTime::DEFINE_CLASS); 1056 1057 if (UsePerfData) { 1058 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 1059 } 1060 1061 // Class resolution will get the class name from the .class stream if the name is null. 1062 TempNewSymbol class_name = name == nullptr ? nullptr : 1063 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1064 CHECK_NULL); 1065 1066 ResourceMark rm(THREAD); 1067 ClassFileStream st((u1*)buf, len, source); 1068 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 1069 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1070 ClassLoadInfo cl_info(protection_domain); 1071 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 1072 class_loader, 1073 cl_info, 1074 CHECK_NULL); 1075 1076 if (log_is_enabled(Debug, class, resolve)) { 1077 trace_class_resolution(k); 1078 } 1079 1080 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1081 } 1082 1083 enum { 1084 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 1085 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 1086 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 1087 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 1088 }; 1089 1090 /* 1091 * Define a class with the specified flags that indicates if it's a nestmate, 1092 * hidden, or strongly referenced from class loader. 1093 */ 1094 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 1095 const jbyte *buf, jsize len, jobject pd, 1096 jboolean init, int flags, jobject classData, TRAPS) { 1097 ResourceMark rm(THREAD); 1098 1099 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup)); 1100 // Lookup class must not be a primitive class (whose mirror has a null Klass*) 1101 if (lookup_k == nullptr) { 1102 // The error message is wrong. We come here only if lookup is a primitive class 1103 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1104 } 1105 1106 Handle class_loader (THREAD, lookup_k->class_loader()); 1107 1108 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 1109 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1110 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1111 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1112 1113 InstanceKlass* host_class = nullptr; 1114 if (is_nestmate) { 1115 host_class = lookup_k->nest_host(CHECK_NULL); 1116 } 1117 1118 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1119 name, 1120 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1121 is_nestmate ? host_class->external_name() : "", 1122 is_hidden ? "hidden" : "not hidden", 1123 is_strong ? "strong" : "weak", 1124 vm_annotations ? "with vm annotations" : "without vm annotation"); 1125 1126 if (!is_hidden) { 1127 // classData is only applicable for hidden classes 1128 if (classData != nullptr) { 1129 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1130 } 1131 if (is_nestmate) { 1132 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1133 } 1134 if (!is_strong) { 1135 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1136 } 1137 if (vm_annotations) { 1138 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1139 } 1140 if (flags != STRONG_LOADER_LINK) { 1141 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1142 err_msg("invalid flag 0x%x", flags)); 1143 } 1144 } 1145 1146 // Class resolution will get the class name from the .class stream if the name is null. 1147 TempNewSymbol class_name = name == nullptr ? nullptr : 1148 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1149 CHECK_NULL); 1150 1151 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1152 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1153 ClassFileStream st((u1*)buf, len, source); 1154 1155 InstanceKlass* ik = nullptr; 1156 if (!is_hidden) { 1157 ClassLoadInfo cl_info(protection_domain); 1158 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1159 class_loader, 1160 cl_info, 1161 CHECK_NULL); 1162 1163 if (log_is_enabled(Debug, class, resolve)) { 1164 trace_class_resolution(ik); 1165 } 1166 } else { // hidden 1167 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1168 ClassLoadInfo cl_info(protection_domain, 1169 host_class, 1170 classData_h, 1171 is_hidden, 1172 is_strong, 1173 vm_annotations); 1174 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1175 class_loader, 1176 cl_info, 1177 CHECK_NULL); 1178 1179 // The hidden class loader data has been artificially been kept alive to 1180 // this point. The mirror and any instances of this class have to keep 1181 // it alive afterwards. 1182 ik->class_loader_data()->dec_keep_alive_ref_count(); 1183 1184 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1185 ModuleEntry* module = ik->module(); 1186 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1187 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1188 module_name, 1189 ik->external_name(), 1190 host_class->external_name(), 1191 ik->is_hidden() ? "is hidden" : "is not hidden"); 1192 } 1193 } 1194 1195 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) { 1196 // non-hidden class or nestmate class must be in the same package as the Lookup class 1197 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages"); 1198 } 1199 1200 if (init) { 1201 ik->initialize(CHECK_NULL); 1202 } else { 1203 ik->link_class(CHECK_NULL); 1204 } 1205 1206 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1207 } 1208 1209 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1210 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1211 JVM_END 1212 1213 /* 1214 * Define a class with the specified lookup class. 1215 * lookup: Lookup class 1216 * name: the name of the class 1217 * buf: class bytes 1218 * len: length of class bytes 1219 * pd: protection domain 1220 * init: initialize the class 1221 * flags: properties of the class 1222 * classData: private static pre-initialized field 1223 */ 1224 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1225 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1226 1227 if (lookup == nullptr) { 1228 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1229 } 1230 1231 assert(buf != nullptr, "buf must not be null"); 1232 1233 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1234 JVM_END 1235 1236 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1237 1238 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1239 JVM_END 1240 1241 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1242 ResourceMark rm(THREAD); 1243 1244 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1245 char* str = java_lang_String::as_utf8_string(h_name()); 1246 1247 // Sanity check, don't expect null 1248 if (str == nullptr) return nullptr; 1249 1250 // Internalize the string, converting '.' to '/' in string. 1251 char* p = (char*)str; 1252 while (*p != '\0') { 1253 if (*p == '.') { 1254 *p = '/'; 1255 } 1256 p++; 1257 } 1258 1259 const int str_len = (int)(p - str); 1260 if (str_len > Symbol::max_length()) { 1261 // It's impossible to create this class; the name cannot fit 1262 // into the constant pool. 1263 return nullptr; 1264 } 1265 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1266 1267 // Security Note: 1268 // The Java level wrapper will perform the necessary security check allowing 1269 // us to pass the null as the initiating class loader. 1270 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1271 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader); 1272 #if INCLUDE_CDS 1273 if (k == nullptr) { 1274 // If the class is not already loaded, try to see if it's in the shared 1275 // archive for the current classloader (h_loader). 1276 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1277 } 1278 #endif 1279 return (k == nullptr) ? nullptr : 1280 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1281 JVM_END 1282 1283 // Module support ////////////////////////////////////////////////////////////////////////////// 1284 1285 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1286 jstring location, jobjectArray packages)) 1287 Handle h_module (THREAD, JNIHandles::resolve(module)); 1288 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1289 JVM_END 1290 1291 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1292 Handle h_module (THREAD, JNIHandles::resolve(module)); 1293 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1294 JVM_END 1295 1296 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1297 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1298 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1299 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1300 JVM_END 1301 1302 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1303 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1304 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1305 JVM_END 1306 1307 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1308 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1309 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1310 JVM_END 1311 1312 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1313 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1314 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1315 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1316 JVM_END 1317 1318 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1319 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1320 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1321 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1322 JVM_END 1323 1324 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1325 1326 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1327 assert (cls != nullptr, "illegal class"); 1328 JvmtiVMObjectAllocEventCollector oam; 1329 ResourceMark rm(THREAD); 1330 HandleMark hm(THREAD); 1331 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1332 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1333 return (jstring) JNIHandles::make_local(THREAD, result); 1334 JVM_END 1335 1336 1337 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1338 JvmtiVMObjectAllocEventCollector oam; 1339 oop mirror = JNIHandles::resolve_non_null(cls); 1340 1341 // Special handling for primitive objects 1342 if (java_lang_Class::is_primitive(mirror)) { 1343 // Primitive objects does not have any interfaces 1344 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1345 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1346 } 1347 1348 Klass* klass = java_lang_Class::as_Klass(mirror); 1349 // Figure size of result array 1350 int size; 1351 if (klass->is_instance_klass()) { 1352 InstanceKlass* ik = InstanceKlass::cast(klass); 1353 size = ik->local_interfaces()->length(); 1354 } else { 1355 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1356 size = 2; 1357 } 1358 1359 // Allocate result array 1360 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1361 objArrayHandle result (THREAD, r); 1362 // Fill in result 1363 if (klass->is_instance_klass()) { 1364 // Regular instance klass, fill in all local interfaces 1365 for (int index = 0; index < size; index++) { 1366 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1367 result->obj_at_put(index, k->java_mirror()); 1368 } 1369 } else { 1370 // All arrays implement java.lang.Cloneable and java.io.Serializable 1371 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1372 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1373 } 1374 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1375 JVM_END 1376 1377 1378 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1379 oop mirror = JNIHandles::resolve_non_null(cls); 1380 if (java_lang_Class::is_primitive(mirror)) { 1381 return JNI_FALSE; 1382 } 1383 Klass* k = java_lang_Class::as_Klass(mirror); 1384 return k->is_hidden(); 1385 JVM_END 1386 1387 1388 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1389 ResourceMark rm(THREAD); 1390 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1391 JvmtiVMObjectAllocEventCollector oam; 1392 1393 // Iterate through Java frames 1394 vframeStream vfst(thread); 1395 for(; !vfst.at_end(); vfst.next()) { 1396 int loc = -1; 1397 // get method of frame 1398 Method* method = vfst.method(); 1399 1400 Symbol *name = method->name(); 1401 1402 InstanceKlass* holder = method->method_holder(); 1403 if (name == vmSymbols::runWith_method_name()) { 1404 if (holder == vmClasses::Thread_klass() 1405 || holder == vmClasses::ScopedValue_Carrier_klass()) { 1406 loc = 1; 1407 } 1408 } 1409 1410 if (loc != -1) { 1411 javaVFrame *frame = vfst.asJavaVFrame(); 1412 StackValueCollection* locals = frame->locals(); 1413 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot 1414 Handle result = head_sv->get_obj(); 1415 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1416 if (result() != nullptr) { 1417 return JNIHandles::make_local(THREAD, result()); 1418 } 1419 } 1420 } 1421 1422 return nullptr; 1423 JVM_END 1424 1425 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1426 JvmtiVMObjectAllocEventCollector oam; 1427 // ofClass is a reference to a java_lang_Class object. The mirror object 1428 // of an InstanceKlass 1429 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1430 if (java_lang_Class::is_primitive(ofMirror) || 1431 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1432 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1433 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1434 } 1435 1436 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1437 InnerClassesIterator iter(k); 1438 1439 if (iter.length() == 0) { 1440 // Neither an inner nor outer class 1441 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1442 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1443 } 1444 1445 // find inner class info 1446 constantPoolHandle cp(thread, k->constants()); 1447 int length = iter.length(); 1448 1449 // Allocate temp. result array 1450 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL); 1451 objArrayHandle result (THREAD, r); 1452 int members = 0; 1453 1454 for (; !iter.done(); iter.next()) { 1455 int ioff = iter.inner_class_info_index(); 1456 int ooff = iter.outer_class_info_index(); 1457 1458 if (ioff != 0 && ooff != 0) { 1459 // Check to see if the name matches the class we're looking for 1460 // before attempting to find the class. 1461 if (cp->klass_name_at_matches(k, ooff)) { 1462 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1463 if (outer_klass == k) { 1464 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1465 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1466 1467 // Throws an exception if outer klass has not declared k as 1468 // an inner klass 1469 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1470 1471 result->obj_at_put(members, inner_klass->java_mirror()); 1472 members++; 1473 } 1474 } 1475 } 1476 } 1477 1478 if (members != length) { 1479 // Return array of right length 1480 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL); 1481 for(int i = 0; i < members; i++) { 1482 res->obj_at_put(i, result->obj_at(i)); 1483 } 1484 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1485 } 1486 1487 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1488 JVM_END 1489 1490 1491 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1492 { 1493 // ofClass is a reference to a java_lang_Class object. 1494 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1495 if (java_lang_Class::is_primitive(ofMirror)) { 1496 return nullptr; 1497 } 1498 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1499 if (!klass->is_instance_klass()) { 1500 return nullptr; 1501 } 1502 1503 bool inner_is_member = false; 1504 Klass* outer_klass 1505 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1506 if (outer_klass == nullptr) return nullptr; // already a top-level class 1507 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1508 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1509 } 1510 JVM_END 1511 1512 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1513 { 1514 oop mirror = JNIHandles::resolve_non_null(cls); 1515 if (java_lang_Class::is_primitive(mirror)) { 1516 return nullptr; 1517 } 1518 Klass* klass = java_lang_Class::as_Klass(mirror); 1519 if (!klass->is_instance_klass()) { 1520 return nullptr; 1521 } 1522 InstanceKlass* k = InstanceKlass::cast(klass); 1523 int ooff = 0, noff = 0; 1524 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1525 if (noff != 0) { 1526 constantPoolHandle i_cp(thread, k->constants()); 1527 Symbol* name = i_cp->symbol_at(noff); 1528 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1529 return (jstring) JNIHandles::make_local(THREAD, str()); 1530 } 1531 } 1532 return nullptr; 1533 } 1534 JVM_END 1535 1536 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1537 assert (cls != nullptr, "illegal class"); 1538 JvmtiVMObjectAllocEventCollector oam; 1539 ResourceMark rm(THREAD); 1540 oop mirror = JNIHandles::resolve_non_null(cls); 1541 // Return null for arrays and primitives 1542 if (!java_lang_Class::is_primitive(mirror)) { 1543 Klass* k = java_lang_Class::as_Klass(mirror); 1544 if (k->is_instance_klass()) { 1545 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1546 if (sym == nullptr) return nullptr; 1547 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1548 return (jstring) JNIHandles::make_local(THREAD, str()); 1549 } 1550 } 1551 return nullptr; 1552 JVM_END 1553 1554 1555 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1556 assert (cls != nullptr, "illegal class"); 1557 oop mirror = JNIHandles::resolve_non_null(cls); 1558 // Return null for arrays and primitives 1559 if (!java_lang_Class::is_primitive(mirror)) { 1560 Klass* k = java_lang_Class::as_Klass(mirror); 1561 if (k->is_instance_klass()) { 1562 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1563 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1564 } 1565 } 1566 return nullptr; 1567 JVM_END 1568 1569 1570 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1571 // some of this code was adapted from from jni_FromReflectedField 1572 1573 oop reflected = JNIHandles::resolve_non_null(field); 1574 oop mirror = java_lang_reflect_Field::clazz(reflected); 1575 int slot = java_lang_reflect_Field::slot(reflected); 1576 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1577 1578 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 1579 int offset = ik->field_offset(slot); 1580 1581 if (modifiers & JVM_ACC_STATIC) { 1582 // for static fields we only look in the current class 1583 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1584 assert(false, "cannot find static field"); 1585 return false; 1586 } 1587 } else { 1588 // for instance fields we start with the current class and work 1589 // our way up through the superclass chain 1590 if (!ik->find_field_from_offset(offset, false, &fd)) { 1591 assert(false, "cannot find instance field"); 1592 return false; 1593 } 1594 } 1595 return true; 1596 } 1597 1598 static Method* jvm_get_method_common(jobject method) { 1599 // some of this code was adapted from from jni_FromReflectedMethod 1600 1601 oop reflected = JNIHandles::resolve_non_null(method); 1602 oop mirror = nullptr; 1603 int slot = 0; 1604 1605 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1606 mirror = java_lang_reflect_Constructor::clazz(reflected); 1607 slot = java_lang_reflect_Constructor::slot(reflected); 1608 } else { 1609 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1610 "wrong type"); 1611 mirror = java_lang_reflect_Method::clazz(reflected); 1612 slot = java_lang_reflect_Method::slot(reflected); 1613 } 1614 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 1615 1616 Method* m = ik->method_with_idnum(slot); 1617 assert(m != nullptr, "cannot find method"); 1618 return m; // caller has to deal with null in product mode 1619 } 1620 1621 /* Type use annotations support (JDK 1.8) */ 1622 1623 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1624 assert (cls != nullptr, "illegal class"); 1625 ResourceMark rm(THREAD); 1626 // Return null for arrays and primitives 1627 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1628 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1629 if (k->is_instance_klass()) { 1630 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1631 if (type_annotations != nullptr) { 1632 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1633 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1634 } 1635 } 1636 } 1637 return nullptr; 1638 JVM_END 1639 1640 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1641 assert (method != nullptr, "illegal method"); 1642 // method is a handle to a java.lang.reflect.Method object 1643 Method* m = jvm_get_method_common(method); 1644 if (m == nullptr) { 1645 return nullptr; 1646 } 1647 1648 AnnotationArray* type_annotations = m->type_annotations(); 1649 if (type_annotations != nullptr) { 1650 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1651 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1652 } 1653 1654 return nullptr; 1655 JVM_END 1656 1657 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1658 assert (field != nullptr, "illegal field"); 1659 fieldDescriptor fd; 1660 bool gotFd = jvm_get_field_common(field, fd); 1661 if (!gotFd) { 1662 return nullptr; 1663 } 1664 1665 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1666 JVM_END 1667 1668 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1669 if (!cp->is_within_bounds(index)) { 1670 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1671 } 1672 } 1673 1674 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1675 { 1676 // method is a handle to a java.lang.reflect.Method object 1677 Method* method_ptr = jvm_get_method_common(method); 1678 methodHandle mh (THREAD, method_ptr); 1679 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1680 const int num_params = mh->method_parameters_length(); 1681 1682 if (num_params < 0) { 1683 // A -1 return value from method_parameters_length means there is no 1684 // parameter data. Return null to indicate this to the reflection 1685 // API. 1686 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1687 return (jobjectArray)nullptr; 1688 } else { 1689 // Otherwise, we return something up to reflection, even if it is 1690 // a zero-length array. Why? Because in some cases this can 1691 // trigger a MalformedParametersException. 1692 1693 // make sure all the symbols are properly formatted 1694 for (int i = 0; i < num_params; i++) { 1695 MethodParametersElement* params = mh->method_parameters_start(); 1696 int index = params[i].name_cp_index; 1697 constantPoolHandle cp(THREAD, mh->constants()); 1698 bounds_check(cp, index, CHECK_NULL); 1699 1700 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1701 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1702 "Wrong type at constant pool index"); 1703 } 1704 1705 } 1706 1707 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1708 objArrayHandle result (THREAD, result_oop); 1709 1710 for (int i = 0; i < num_params; i++) { 1711 MethodParametersElement* params = mh->method_parameters_start(); 1712 // For a 0 index, give a null symbol 1713 Symbol* sym = 0 != params[i].name_cp_index ? 1714 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1715 int flags = params[i].flags; 1716 oop param = Reflection::new_parameter(reflected_method, i, sym, 1717 flags, CHECK_NULL); 1718 result->obj_at_put(i, param); 1719 } 1720 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1721 } 1722 } 1723 JVM_END 1724 1725 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1726 1727 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1728 { 1729 JvmtiVMObjectAllocEventCollector oam; 1730 1731 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1732 // Exclude primitive types and array types 1733 if (java_lang_Class::is_primitive(ofMirror) || 1734 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1735 // Return empty array 1736 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1737 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1738 } 1739 1740 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1741 constantPoolHandle cp(THREAD, k->constants()); 1742 1743 // Ensure class is linked 1744 k->link_class(CHECK_NULL); 1745 1746 // Allocate result 1747 int num_fields; 1748 1749 if (publicOnly) { 1750 num_fields = 0; 1751 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1752 if (fs.access_flags().is_public()) ++num_fields; 1753 } 1754 } else { 1755 num_fields = k->java_fields_count(); 1756 } 1757 1758 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1759 objArrayHandle result (THREAD, r); 1760 1761 int out_idx = 0; 1762 fieldDescriptor fd; 1763 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1764 if (!publicOnly || fs.access_flags().is_public()) { 1765 fd.reinitialize(k, fs.to_FieldInfo()); 1766 oop field = Reflection::new_field(&fd, CHECK_NULL); 1767 result->obj_at_put(out_idx, field); 1768 ++out_idx; 1769 } 1770 } 1771 assert(out_idx == num_fields, "just checking"); 1772 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1773 } 1774 JVM_END 1775 1776 // A class is a record if and only if it is final and a direct subclass of 1777 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1778 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1779 { 1780 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1781 if (k != nullptr && k->is_instance_klass()) { 1782 InstanceKlass* ik = InstanceKlass::cast(k); 1783 return ik->is_record(); 1784 } else { 1785 return false; 1786 } 1787 } 1788 JVM_END 1789 1790 // Returns an array containing the components of the Record attribute, 1791 // or null if the attribute is not present. 1792 // 1793 // Note that this function returns the components of the Record attribute 1794 // even if the class is not a record. 1795 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1796 { 1797 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass)); 1798 1799 Array<RecordComponent*>* components = ik->record_components(); 1800 if (components != nullptr) { 1801 JvmtiVMObjectAllocEventCollector oam; 1802 constantPoolHandle cp(THREAD, ik->constants()); 1803 int length = components->length(); 1804 assert(length >= 0, "unexpected record_components length"); 1805 objArrayOop record_components = 1806 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1807 objArrayHandle components_h (THREAD, record_components); 1808 1809 for (int x = 0; x < length; x++) { 1810 RecordComponent* component = components->at(x); 1811 assert(component != nullptr, "unexpected null record component"); 1812 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1813 components_h->obj_at_put(x, component_oop); 1814 } 1815 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1816 } 1817 1818 return nullptr; 1819 } 1820 JVM_END 1821 1822 static jobjectArray get_class_declared_methods_helper( 1823 JNIEnv *env, 1824 jclass ofClass, jboolean publicOnly, 1825 bool want_constructor, 1826 Klass* klass, TRAPS) { 1827 1828 JvmtiVMObjectAllocEventCollector oam; 1829 1830 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1831 // Exclude primitive types and array types 1832 if (java_lang_Class::is_primitive(ofMirror) 1833 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1834 // Return empty array 1835 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1836 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1837 } 1838 1839 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1840 1841 // Ensure class is linked 1842 k->link_class(CHECK_NULL); 1843 1844 Array<Method*>* methods = k->methods(); 1845 int methods_length = methods->length(); 1846 1847 // Save original method_idnum in case of redefinition, which can change 1848 // the idnum of obsolete methods. The new method will have the same idnum 1849 // but if we refresh the methods array, the counts will be wrong. 1850 ResourceMark rm(THREAD); 1851 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1852 int num_methods = 0; 1853 1854 // Select methods matching the criteria. 1855 for (int i = 0; i < methods_length; i++) { 1856 Method* method = methods->at(i); 1857 if (want_constructor && !method->is_object_constructor()) { 1858 continue; 1859 } 1860 if (!want_constructor && 1861 (method->is_object_constructor() || method->is_class_initializer() || 1862 method->is_overpass())) { 1863 continue; 1864 } 1865 if (publicOnly && !method->is_public()) { 1866 continue; 1867 } 1868 idnums->push(method->method_idnum()); 1869 ++num_methods; 1870 } 1871 1872 // Allocate result 1873 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1874 objArrayHandle result (THREAD, r); 1875 1876 // Now just put the methods that we selected above, but go by their idnum 1877 // in case of redefinition. The methods can be redefined at any safepoint, 1878 // so above when allocating the oop array and below when creating reflect 1879 // objects. 1880 for (int i = 0; i < num_methods; i++) { 1881 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1882 if (method.is_null()) { 1883 // Method may have been deleted and seems this API can handle null 1884 // Otherwise should probably put a method that throws NSME 1885 result->obj_at_put(i, nullptr); 1886 } else { 1887 oop m; 1888 if (want_constructor) { 1889 assert(method->is_object_constructor(), "must be"); 1890 m = Reflection::new_constructor(method, CHECK_NULL); 1891 } else { 1892 m = Reflection::new_method(method, false, CHECK_NULL); 1893 } 1894 result->obj_at_put(i, m); 1895 } 1896 } 1897 1898 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1899 } 1900 1901 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1902 { 1903 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1904 /*want_constructor*/ false, 1905 vmClasses::reflect_Method_klass(), THREAD); 1906 } 1907 JVM_END 1908 1909 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1910 { 1911 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1912 /*want_constructor*/ true, 1913 vmClasses::reflect_Constructor_klass(), THREAD); 1914 } 1915 JVM_END 1916 1917 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1918 { 1919 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1920 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member)); 1921 return c->has_nestmate_access_to(m, THREAD); 1922 } 1923 JVM_END 1924 1925 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1926 { 1927 // current is not a primitive or array class 1928 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1929 InstanceKlass* host = c->nest_host(THREAD); 1930 return (jclass) (host == nullptr ? nullptr : 1931 JNIHandles::make_local(THREAD, host->java_mirror())); 1932 } 1933 JVM_END 1934 1935 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1936 { 1937 // current is not a primitive or array class 1938 ResourceMark rm(THREAD); 1939 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1940 InstanceKlass* host = c->nest_host(THREAD); 1941 1942 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 1943 c->external_name(), host->external_name()); 1944 { 1945 JvmtiVMObjectAllocEventCollector oam; 1946 Array<u2>* members = host->nest_members(); 1947 int length = members == nullptr ? 0 : members->length(); 1948 1949 log_trace(class, nestmates)(" - host has %d listed nest members", length); 1950 1951 // nest host is first in the array so make it one bigger 1952 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 1953 length + 1, CHECK_NULL); 1954 objArrayHandle result(THREAD, r); 1955 result->obj_at_put(0, host->java_mirror()); 1956 if (length != 0) { 1957 int count = 0; 1958 for (int i = 0; i < length; i++) { 1959 int cp_index = members->at(i); 1960 Klass* k = host->constants()->klass_at(cp_index, THREAD); 1961 if (HAS_PENDING_EXCEPTION) { 1962 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 1963 return nullptr; // propagate VMEs 1964 } 1965 if (log_is_enabled(Trace, class, nestmates)) { 1966 stringStream ss; 1967 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 1968 ss.print(" - resolution of nest member %s failed: ", target_member_class); 1969 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 1970 log_trace(class, nestmates)("%s", ss.as_string()); 1971 } 1972 CLEAR_PENDING_EXCEPTION; 1973 continue; 1974 } 1975 if (k->is_instance_klass()) { 1976 InstanceKlass* ik = InstanceKlass::cast(k); 1977 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 1978 if (nest_host_k == host) { 1979 result->obj_at_put(count+1, k->java_mirror()); 1980 count++; 1981 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 1982 } else { 1983 log_trace(class, nestmates)(" - skipping member %s with different host %s", 1984 ik->external_name(), nest_host_k->external_name()); 1985 } 1986 } else { 1987 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 1988 k->external_name()); 1989 } 1990 } 1991 if (count < length) { 1992 // we had invalid entries so we need to compact the array 1993 log_trace(class, nestmates)(" - compacting array from length %d to %d", 1994 length + 1, count + 1); 1995 1996 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 1997 count + 1, CHECK_NULL); 1998 objArrayHandle result2(THREAD, r2); 1999 for (int i = 0; i < count + 1; i++) { 2000 result2->obj_at_put(i, result->obj_at(i)); 2001 } 2002 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2003 } 2004 } 2005 else { 2006 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate"); 2007 } 2008 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2009 } 2010 } 2011 JVM_END 2012 2013 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2014 { 2015 oop mirror = JNIHandles::resolve_non_null(current); 2016 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2017 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 2018 2019 ResourceMark rm(THREAD); 2020 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2021 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2022 if (ik->is_sealed()) { 2023 JvmtiVMObjectAllocEventCollector oam; 2024 Array<u2>* subclasses = ik->permitted_subclasses(); 2025 int length = subclasses->length(); 2026 2027 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2028 2029 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2030 length, CHECK_NULL); 2031 objArrayHandle result(THREAD, r); 2032 int count = 0; 2033 for (int i = 0; i < length; i++) { 2034 int cp_index = subclasses->at(i); 2035 Klass* k = ik->constants()->klass_at(cp_index, THREAD); 2036 if (HAS_PENDING_EXCEPTION) { 2037 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2038 return nullptr; // propagate VMEs 2039 } 2040 if (log_is_enabled(Trace, class, sealed)) { 2041 stringStream ss; 2042 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2043 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2044 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2045 log_trace(class, sealed)("%s", ss.as_string()); 2046 } 2047 2048 CLEAR_PENDING_EXCEPTION; 2049 continue; 2050 } 2051 if (k->is_instance_klass()) { 2052 result->obj_at_put(count++, k->java_mirror()); 2053 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2054 } 2055 } 2056 if (count < length) { 2057 // we had invalid entries so we need to compact the array 2058 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2059 count, CHECK_NULL); 2060 objArrayHandle result2(THREAD, r2); 2061 for (int i = 0; i < count; i++) { 2062 result2->obj_at_put(i, result->obj_at(i)); 2063 } 2064 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2065 } 2066 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2067 } else { 2068 return nullptr; 2069 } 2070 } 2071 JVM_END 2072 2073 // Constant pool access ////////////////////////////////////////////////////////// 2074 2075 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2076 { 2077 JvmtiVMObjectAllocEventCollector oam; 2078 oop mirror = JNIHandles::resolve_non_null(cls); 2079 // Return null for primitives and arrays 2080 if (!java_lang_Class::is_primitive(mirror)) { 2081 Klass* k = java_lang_Class::as_Klass(mirror); 2082 if (k->is_instance_klass()) { 2083 InstanceKlass* k_h = InstanceKlass::cast(k); 2084 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2085 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2086 return JNIHandles::make_local(THREAD, jcp()); 2087 } 2088 } 2089 return nullptr; 2090 } 2091 JVM_END 2092 2093 2094 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj)) 2095 { 2096 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2097 return cp->length(); 2098 } 2099 JVM_END 2100 2101 2102 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index)) 2103 { 2104 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2105 bounds_check(cp, index, CHECK_NULL); 2106 constantTag tag = cp->tag_at(index); 2107 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2108 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2109 } 2110 Klass* k = cp->klass_at(index, CHECK_NULL); 2111 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2112 } 2113 JVM_END 2114 2115 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2116 { 2117 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2118 bounds_check(cp, index, CHECK_NULL); 2119 constantTag tag = cp->tag_at(index); 2120 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2121 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2122 } 2123 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2124 if (k == nullptr) return nullptr; 2125 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2126 } 2127 JVM_END 2128 2129 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2130 constantTag tag = cp->tag_at(index); 2131 if (!tag.is_method() && !tag.is_interface_method()) { 2132 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2133 } 2134 int klass_ref = cp->uncached_klass_ref_index_at(index); 2135 Klass* k_o; 2136 if (force_resolution) { 2137 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2138 } else { 2139 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2140 if (k_o == nullptr) return nullptr; 2141 } 2142 InstanceKlass* k = InstanceKlass::cast(k_o); 2143 Symbol* name = cp->uncached_name_ref_at(index); 2144 Symbol* sig = cp->uncached_signature_ref_at(index); 2145 methodHandle m (THREAD, k->find_method(name, sig)); 2146 if (m.is_null()) { 2147 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2148 } 2149 oop method; 2150 if (m->is_object_constructor()) { 2151 method = Reflection::new_constructor(m, CHECK_NULL); 2152 } else { 2153 method = Reflection::new_method(m, true, CHECK_NULL); 2154 } 2155 return JNIHandles::make_local(THREAD, method); 2156 } 2157 2158 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index)) 2159 { 2160 JvmtiVMObjectAllocEventCollector oam; 2161 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2162 bounds_check(cp, index, CHECK_NULL); 2163 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2164 return res; 2165 } 2166 JVM_END 2167 2168 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2169 { 2170 JvmtiVMObjectAllocEventCollector oam; 2171 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2172 bounds_check(cp, index, CHECK_NULL); 2173 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2174 return res; 2175 } 2176 JVM_END 2177 2178 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2179 constantTag tag = cp->tag_at(index); 2180 if (!tag.is_field()) { 2181 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2182 } 2183 int klass_ref = cp->uncached_klass_ref_index_at(index); 2184 Klass* k_o; 2185 if (force_resolution) { 2186 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2187 } else { 2188 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2189 if (k_o == nullptr) return nullptr; 2190 } 2191 InstanceKlass* k = InstanceKlass::cast(k_o); 2192 Symbol* name = cp->uncached_name_ref_at(index); 2193 Symbol* sig = cp->uncached_signature_ref_at(index); 2194 fieldDescriptor fd; 2195 Klass* target_klass = k->find_field(name, sig, &fd); 2196 if (target_klass == nullptr) { 2197 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2198 } 2199 oop field = Reflection::new_field(&fd, CHECK_NULL); 2200 return JNIHandles::make_local(THREAD, field); 2201 } 2202 2203 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index)) 2204 { 2205 JvmtiVMObjectAllocEventCollector oam; 2206 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2207 bounds_check(cp, index, CHECK_NULL); 2208 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2209 return res; 2210 } 2211 JVM_END 2212 2213 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2214 { 2215 JvmtiVMObjectAllocEventCollector oam; 2216 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2217 bounds_check(cp, index, CHECK_NULL); 2218 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2219 return res; 2220 } 2221 JVM_END 2222 2223 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index)) 2224 { 2225 JvmtiVMObjectAllocEventCollector oam; 2226 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2227 bounds_check(cp, index, CHECK_NULL); 2228 constantTag tag = cp->tag_at(index); 2229 if (!tag.is_field_or_method()) { 2230 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2231 } 2232 int klass_ref = cp->uncached_klass_ref_index_at(index); 2233 Symbol* klass_name = cp->klass_name_at(klass_ref); 2234 Symbol* member_name = cp->uncached_name_ref_at(index); 2235 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2236 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2237 objArrayHandle dest(THREAD, dest_o); 2238 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2239 dest->obj_at_put(0, str()); 2240 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2241 dest->obj_at_put(1, str()); 2242 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2243 dest->obj_at_put(2, str()); 2244 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2245 } 2246 JVM_END 2247 2248 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index)) 2249 { 2250 JvmtiVMObjectAllocEventCollector oam; 2251 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2252 bounds_check(cp, index, CHECK_0); 2253 constantTag tag = cp->tag_at(index); 2254 if (!tag.is_field_or_method()) { 2255 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2256 } 2257 return (jint) cp->uncached_klass_ref_index_at(index); 2258 } 2259 JVM_END 2260 2261 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index)) 2262 { 2263 JvmtiVMObjectAllocEventCollector oam; 2264 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2265 bounds_check(cp, index, CHECK_0); 2266 constantTag tag = cp->tag_at(index); 2267 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2268 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2269 } 2270 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2271 } 2272 JVM_END 2273 2274 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index)) 2275 { 2276 JvmtiVMObjectAllocEventCollector oam; 2277 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2278 bounds_check(cp, index, CHECK_NULL); 2279 constantTag tag = cp->tag_at(index); 2280 if (!tag.is_name_and_type()) { 2281 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2282 } 2283 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2284 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2285 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2286 objArrayHandle dest(THREAD, dest_o); 2287 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2288 dest->obj_at_put(0, str()); 2289 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2290 dest->obj_at_put(1, str()); 2291 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2292 } 2293 JVM_END 2294 2295 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index)) 2296 { 2297 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2298 bounds_check(cp, index, CHECK_0); 2299 constantTag tag = cp->tag_at(index); 2300 if (!tag.is_int()) { 2301 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2302 } 2303 return cp->int_at(index); 2304 } 2305 JVM_END 2306 2307 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index)) 2308 { 2309 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2310 bounds_check(cp, index, CHECK_(0L)); 2311 constantTag tag = cp->tag_at(index); 2312 if (!tag.is_long()) { 2313 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2314 } 2315 return cp->long_at(index); 2316 } 2317 JVM_END 2318 2319 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index)) 2320 { 2321 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2322 bounds_check(cp, index, CHECK_(0.0f)); 2323 constantTag tag = cp->tag_at(index); 2324 if (!tag.is_float()) { 2325 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2326 } 2327 return cp->float_at(index); 2328 } 2329 JVM_END 2330 2331 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(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_(0.0)); 2335 constantTag tag = cp->tag_at(index); 2336 if (!tag.is_double()) { 2337 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2338 } 2339 return cp->double_at(index); 2340 } 2341 JVM_END 2342 2343 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(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_NULL); 2347 constantTag tag = cp->tag_at(index); 2348 if (!tag.is_string()) { 2349 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2350 } 2351 oop str = cp->string_at(index, CHECK_NULL); 2352 return (jstring) JNIHandles::make_local(THREAD, str); 2353 } 2354 JVM_END 2355 2356 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index)) 2357 { 2358 JvmtiVMObjectAllocEventCollector oam; 2359 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2360 bounds_check(cp, index, CHECK_NULL); 2361 constantTag tag = cp->tag_at(index); 2362 if (!tag.is_symbol()) { 2363 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2364 } 2365 Symbol* sym = cp->symbol_at(index); 2366 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2367 return (jstring) JNIHandles::make_local(THREAD, str()); 2368 } 2369 JVM_END 2370 2371 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index)) 2372 { 2373 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2374 bounds_check(cp, index, CHECK_0); 2375 constantTag tag = cp->tag_at(index); 2376 jbyte result = tag.value(); 2377 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2378 // they are changed to the corresponding tags from the JVM spec, so that java code in 2379 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2380 if (tag.is_klass_or_reference()) { 2381 result = JVM_CONSTANT_Class; 2382 } else if (tag.is_string_index()) { 2383 result = JVM_CONSTANT_String; 2384 } else if (tag.is_method_type_in_error()) { 2385 result = JVM_CONSTANT_MethodType; 2386 } else if (tag.is_method_handle_in_error()) { 2387 result = JVM_CONSTANT_MethodHandle; 2388 } else if (tag.is_dynamic_constant_in_error()) { 2389 result = JVM_CONSTANT_Dynamic; 2390 } 2391 return result; 2392 } 2393 JVM_END 2394 2395 // Assertion support. ////////////////////////////////////////////////////////// 2396 2397 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2398 assert(cls != nullptr, "bad class"); 2399 2400 oop r = JNIHandles::resolve(cls); 2401 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2402 if (java_lang_Class::is_primitive(r)) return false; 2403 2404 Klass* k = java_lang_Class::as_Klass(r); 2405 assert(k->is_instance_klass(), "must be an instance klass"); 2406 if (!k->is_instance_klass()) return false; 2407 2408 ResourceMark rm(THREAD); 2409 const char* name = k->name()->as_C_string(); 2410 bool system_class = k->class_loader() == nullptr; 2411 return JavaAssertions::enabled(name, system_class); 2412 2413 JVM_END 2414 2415 2416 // Return a new AssertionStatusDirectives object with the fields filled in with 2417 // command-line assertion arguments (i.e., -ea, -da). 2418 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2419 JvmtiVMObjectAllocEventCollector oam; 2420 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2421 return JNIHandles::make_local(THREAD, asd); 2422 JVM_END 2423 2424 // Verification //////////////////////////////////////////////////////////////////////////////// 2425 2426 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2427 2428 // RedefineClasses support: bug 6214132 caused verification to fail. 2429 // All functions from this section, unless noted otherwise, should call the functions 2430 // get_klass_considering_redefinition(), or 2431 // get_instance_klass_considering_redefinition() 2432 // These functions return JvmtiThreadState::_scratch_class if the verifier 2433 // was invoked in the middle of the redefinition of cls. 2434 // See jvmtiThreadState.hpp for details. 2435 2436 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) { 2437 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2438 if (k->is_instance_klass()) { 2439 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread); 2440 } else { 2441 return k; 2442 } 2443 } 2444 2445 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) { 2446 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls)); 2447 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread); 2448 } 2449 2450 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 2451 oop mirror = JNIHandles::resolve_non_null(cls); 2452 if (java_lang_Class::is_primitive(mirror)) { 2453 return JNI_FALSE; 2454 } 2455 Klass* k = java_lang_Class::as_Klass(mirror); 2456 // This isn't necessary since answer is the same because redefinition 2457 // has already checked this matches for the scratch class. 2458 // k = get_klass_considering_redefinition(cls, thread) 2459 jboolean result = k->is_interface(); 2460 assert(!result || k->is_instance_klass(), 2461 "all interfaces are instance types"); 2462 return result; 2463 JVM_END 2464 2465 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2466 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name. 2467 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2468 return k->name()->as_utf8(); 2469 JVM_END 2470 2471 2472 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2473 Klass* k = get_klass_considering_redefinition(cls, thread); 2474 // types will have length zero if this is not an InstanceKlass 2475 // (length is determined by call to JVM_GetClassCPEntriesCount) 2476 if (k->is_instance_klass()) { 2477 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2478 for (int index = cp->length() - 1; index >= 0; index--) { 2479 constantTag tag = cp->tag_at(index); 2480 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2481 } 2482 } 2483 JVM_END 2484 2485 2486 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2487 Klass* k = get_klass_considering_redefinition(cls, thread); 2488 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2489 JVM_END 2490 2491 2492 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2493 Klass* k = get_klass_considering_redefinition(cls, thread); 2494 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2495 JVM_END 2496 2497 2498 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2499 Klass* k = get_klass_considering_redefinition(cls, thread); 2500 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2501 JVM_END 2502 2503 2504 // The following methods, used for the verifier, are never called with 2505 // array klasses, so a direct cast to InstanceKlass is safe. 2506 // Typically, these methods are called in a loop with bounds determined 2507 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2508 // zero for arrays. 2509 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2510 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2511 Method* method = ik->methods()->at(method_index); 2512 int length = method->checked_exceptions_length(); 2513 if (length > 0) { 2514 CheckedExceptionElement* table= method->checked_exceptions_start(); 2515 for (int i = 0; i < length; i++) { 2516 exceptions[i] = table[i].class_cp_index; 2517 } 2518 } 2519 JVM_END 2520 2521 2522 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2523 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2524 Method* method = ik->methods()->at(method_index); 2525 return method->checked_exceptions_length(); 2526 JVM_END 2527 2528 2529 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2530 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2531 Method* method = ik->methods()->at(method_index); 2532 memcpy(code, method->code_base(), method->code_size()); 2533 JVM_END 2534 2535 2536 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2537 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2538 Method* method = ik->methods()->at(method_index); 2539 return method->code_size(); 2540 JVM_END 2541 2542 2543 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2544 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2545 Method* method = ik->methods()->at(method_index); 2546 ExceptionTable extable(method); 2547 entry->start_pc = extable.start_pc(entry_index); 2548 entry->end_pc = extable.end_pc(entry_index); 2549 entry->handler_pc = extable.handler_pc(entry_index); 2550 entry->catchType = extable.catch_type_index(entry_index); 2551 JVM_END 2552 2553 2554 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2555 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2556 Method* method = ik->methods()->at(method_index); 2557 return method->exception_table_length(); 2558 JVM_END 2559 2560 2561 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2562 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2563 Method* method = ik->methods()->at(method_index); 2564 return method->access_flags().as_method_flags(); 2565 JVM_END 2566 2567 2568 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2569 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2570 return ik->field_access_flags(field_index); 2571 JVM_END 2572 2573 2574 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2575 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2576 Method* method = ik->methods()->at(method_index); 2577 return method->max_locals(); 2578 JVM_END 2579 2580 2581 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2582 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2583 Method* method = ik->methods()->at(method_index); 2584 return method->size_of_parameters(); 2585 JVM_END 2586 2587 2588 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2589 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2590 Method* method = ik->methods()->at(method_index); 2591 return method->verifier_max_stack(); 2592 JVM_END 2593 2594 2595 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2596 ResourceMark rm(THREAD); 2597 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2598 Method* method = ik->methods()->at(method_index); 2599 return method->is_object_constructor(); 2600 JVM_END 2601 2602 2603 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2604 ResourceMark rm(THREAD); 2605 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2606 Method* method = ik->methods()->at(method_index); 2607 return method->is_overpass(); 2608 JVM_END 2609 2610 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2611 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2612 Method* method = ik->methods()->at(method_index); 2613 return method->name()->as_utf8(); 2614 JVM_END 2615 2616 2617 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2618 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2619 Method* method = ik->methods()->at(method_index); 2620 return method->signature()->as_utf8(); 2621 JVM_END 2622 2623 /** 2624 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2625 * read entries in the constant pool. Since the old verifier always 2626 * works on a copy of the code, it will not see any rewriting that 2627 * may possibly occur in the middle of verification. So it is important 2628 * that nothing it calls tries to use the cpCache instead of the raw 2629 * constant pool, so we must use cp->uncached_x methods when appropriate. 2630 */ 2631 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2632 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2633 ConstantPool* cp = ik->constants(); 2634 switch (cp->tag_at(cp_index).value()) { 2635 case JVM_CONSTANT_Fieldref: 2636 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2637 default: 2638 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2639 } 2640 ShouldNotReachHere(); 2641 return nullptr; 2642 JVM_END 2643 2644 2645 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2646 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2647 ConstantPool* cp = ik->constants(); 2648 switch (cp->tag_at(cp_index).value()) { 2649 case JVM_CONSTANT_InterfaceMethodref: 2650 case JVM_CONSTANT_Methodref: 2651 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2652 default: 2653 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2654 } 2655 ShouldNotReachHere(); 2656 return nullptr; 2657 JVM_END 2658 2659 2660 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2661 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2662 ConstantPool* cp = ik->constants(); 2663 switch (cp->tag_at(cp_index).value()) { 2664 case JVM_CONSTANT_InterfaceMethodref: 2665 case JVM_CONSTANT_Methodref: 2666 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2667 default: 2668 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2669 } 2670 ShouldNotReachHere(); 2671 return nullptr; 2672 JVM_END 2673 2674 2675 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2676 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2677 ConstantPool* cp = ik->constants(); 2678 switch (cp->tag_at(cp_index).value()) { 2679 case JVM_CONSTANT_Fieldref: 2680 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2681 default: 2682 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2683 } 2684 ShouldNotReachHere(); 2685 return nullptr; 2686 JVM_END 2687 2688 2689 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2690 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2691 ConstantPool* cp = ik->constants(); 2692 Symbol* classname = cp->klass_name_at(cp_index); 2693 return classname->as_utf8(); 2694 JVM_END 2695 2696 2697 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2698 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2699 ConstantPool* cp = ik->constants(); 2700 switch (cp->tag_at(cp_index).value()) { 2701 case JVM_CONSTANT_Fieldref: { 2702 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2703 Symbol* classname = cp->klass_name_at(class_index); 2704 return classname->as_utf8(); 2705 } 2706 default: 2707 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2708 } 2709 ShouldNotReachHere(); 2710 return nullptr; 2711 JVM_END 2712 2713 2714 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2715 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2716 ConstantPool* cp = ik->constants(); 2717 switch (cp->tag_at(cp_index).value()) { 2718 case JVM_CONSTANT_Methodref: 2719 case JVM_CONSTANT_InterfaceMethodref: { 2720 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2721 Symbol* classname = cp->klass_name_at(class_index); 2722 return classname->as_utf8(); 2723 } 2724 default: 2725 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2726 } 2727 ShouldNotReachHere(); 2728 return nullptr; 2729 JVM_END 2730 2731 2732 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2733 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2734 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread); 2735 ConstantPool* cp = ik->constants(); 2736 ConstantPool* cp_called = ik_called->constants(); 2737 switch (cp->tag_at(cp_index).value()) { 2738 case JVM_CONSTANT_Fieldref: { 2739 Symbol* name = cp->uncached_name_ref_at(cp_index); 2740 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2741 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) { 2742 if (fs.name() == name && fs.signature() == signature) { 2743 return fs.access_flags().as_field_flags(); 2744 } 2745 } 2746 return -1; 2747 } 2748 default: 2749 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2750 } 2751 ShouldNotReachHere(); 2752 return 0; 2753 JVM_END 2754 2755 2756 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2757 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2758 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread); 2759 ConstantPool* cp = ik->constants(); 2760 switch (cp->tag_at(cp_index).value()) { 2761 case JVM_CONSTANT_Methodref: 2762 case JVM_CONSTANT_InterfaceMethodref: { 2763 Symbol* name = cp->uncached_name_ref_at(cp_index); 2764 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2765 Array<Method*>* methods = ik_called->methods(); 2766 int methods_count = methods->length(); 2767 for (int i = 0; i < methods_count; i++) { 2768 Method* method = methods->at(i); 2769 if (method->name() == name && method->signature() == signature) { 2770 return method->access_flags().as_method_flags(); 2771 } 2772 } 2773 return -1; 2774 } 2775 default: 2776 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2777 } 2778 ShouldNotReachHere(); 2779 return 0; 2780 JVM_END 2781 2782 2783 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2784 2785 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2786 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2787 JVM_END 2788 2789 2790 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2791 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2792 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2793 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2794 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2795 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2796 JVM_END 2797 2798 // Printing support ////////////////////////////////////////////////// 2799 extern "C" { 2800 2801 ATTRIBUTE_PRINTF(3, 0) 2802 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2803 // Reject count values that are negative signed values converted to 2804 // unsigned; see bug 4399518, 4417214 2805 if ((intptr_t)count <= 0) return -1; 2806 2807 int result = os::vsnprintf(str, count, fmt, args); 2808 if (result > 0 && (size_t)result >= count) { 2809 result = -1; 2810 } 2811 2812 return result; 2813 } 2814 2815 ATTRIBUTE_PRINTF(3, 4) 2816 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2817 va_list args; 2818 int len; 2819 va_start(args, fmt); 2820 len = jio_vsnprintf(str, count, fmt, args); 2821 va_end(args); 2822 return len; 2823 } 2824 2825 ATTRIBUTE_PRINTF(2, 3) 2826 int jio_fprintf(FILE* f, const char *fmt, ...) { 2827 int len; 2828 va_list args; 2829 va_start(args, fmt); 2830 len = jio_vfprintf(f, fmt, args); 2831 va_end(args); 2832 return len; 2833 } 2834 2835 ATTRIBUTE_PRINTF(2, 0) 2836 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2837 if (Arguments::vfprintf_hook() != nullptr) { 2838 return Arguments::vfprintf_hook()(f, fmt, args); 2839 } else { 2840 return vfprintf(f, fmt, args); 2841 } 2842 } 2843 2844 ATTRIBUTE_PRINTF(1, 2) 2845 JNIEXPORT int jio_printf(const char *fmt, ...) { 2846 int len; 2847 va_list args; 2848 va_start(args, fmt); 2849 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2850 va_end(args); 2851 return len; 2852 } 2853 2854 // HotSpot specific jio method 2855 void jio_print(const char* s, size_t len) { 2856 // Try to make this function as atomic as possible. 2857 if (Arguments::vfprintf_hook() != nullptr) { 2858 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2859 } else { 2860 // Make an unused local variable to avoid warning from gcc compiler. 2861 bool dummy = os::write(defaultStream::output_fd(), s, len); 2862 } 2863 } 2864 2865 } // Extern C 2866 2867 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2868 2869 // In most of the JVM thread support functions we need to access the 2870 // thread through a ThreadsListHandle to prevent it from exiting and 2871 // being reclaimed while we try to operate on it. The exceptions to this 2872 // rule are when operating on the current thread, or if the monitor of 2873 // the target java.lang.Thread is locked at the Java level - in both 2874 // cases the target cannot exit. 2875 2876 static void thread_entry(JavaThread* thread, TRAPS) { 2877 HandleMark hm(THREAD); 2878 Handle obj(THREAD, thread->threadObj()); 2879 JavaValue result(T_VOID); 2880 JavaCalls::call_virtual(&result, 2881 obj, 2882 vmClasses::Thread_klass(), 2883 vmSymbols::run_method_name(), 2884 vmSymbols::void_method_signature(), 2885 THREAD); 2886 } 2887 2888 2889 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2890 #if INCLUDE_CDS 2891 if (CDSConfig::allow_only_single_java_thread()) { 2892 // During java -Xshare:dump, if we allow multiple Java threads to 2893 // execute in parallel, symbols and classes may be loaded in 2894 // random orders which will make the resulting CDS archive 2895 // non-deterministic. 2896 // 2897 // Lucikly, during java -Xshare:dump, it's important to run only 2898 // the code in the main Java thread (which is NOT started here) that 2899 // creates the module graph, etc. It's safe to not start the other 2900 // threads which are launched by class static initializers 2901 // (ReferenceHandler, FinalizerThread and CleanerImpl). 2902 if (log_is_enabled(Info, aot)) { 2903 ResourceMark rm; 2904 oop t = JNIHandles::resolve_non_null(jthread); 2905 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 2906 } 2907 return; 2908 } 2909 #endif 2910 JavaThread *native_thread = nullptr; 2911 2912 // We cannot hold the Threads_lock when we throw an exception, 2913 // due to rank ordering issues. Example: we might need to grab the 2914 // Heap_lock while we construct the exception. 2915 bool throw_illegal_thread_state = false; 2916 2917 // We must release the Threads_lock before we can post a jvmti event 2918 // in Thread::start. 2919 { 2920 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock); 2921 // Ensure that the C++ Thread and OSThread structures aren't freed before 2922 // we operate. 2923 MutexLocker ml(Threads_lock); 2924 2925 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2926 // re-starting an already started thread, so we should usually find 2927 // that the JavaThread is null. However for a JNI attached thread 2928 // there is a small window between the Thread object being created 2929 // (with its JavaThread set) and the update to its threadStatus, so we 2930 // have to check for this 2931 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 2932 throw_illegal_thread_state = true; 2933 } else { 2934 jlong size = 2935 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2936 // Allocate the C++ Thread structure and create the native thread. The 2937 // stack size retrieved from java is 64-bit signed, but the constructor takes 2938 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2939 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2940 // - Avoid passing negative values which would result in really large stacks. 2941 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2942 size_t sz = size > 0 ? (size_t) size : 0; 2943 native_thread = new JavaThread(&thread_entry, sz); 2944 2945 // At this point it may be possible that no osthread was created for the 2946 // JavaThread due to lack of memory. Check for this situation and throw 2947 // an exception if necessary. Eventually we may want to change this so 2948 // that we only grab the lock if the thread was created successfully - 2949 // then we can also do this check and throw the exception in the 2950 // JavaThread constructor. 2951 if (native_thread->osthread() != nullptr) { 2952 // Note: the current thread is not being used within "prepare". 2953 native_thread->prepare(jthread); 2954 } 2955 } 2956 } 2957 2958 if (throw_illegal_thread_state) { 2959 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2960 } 2961 2962 assert(native_thread != nullptr, "Starting null thread?"); 2963 2964 if (native_thread->osthread() == nullptr) { 2965 ResourceMark rm(thread); 2966 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 2967 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 2968 // No one should hold a reference to the 'native_thread'. 2969 native_thread->smr_delete(); 2970 if (JvmtiExport::should_post_resource_exhausted()) { 2971 JvmtiExport::post_resource_exhausted( 2972 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2973 os::native_thread_creation_failed_msg()); 2974 } 2975 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2976 os::native_thread_creation_failed_msg()); 2977 } 2978 2979 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 2980 2981 Thread::start(native_thread); 2982 2983 JVM_END 2984 2985 2986 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2987 ThreadsListHandle tlh(thread); 2988 oop java_thread = nullptr; 2989 JavaThread* receiver = nullptr; 2990 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2991 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2992 2993 if (is_alive) { 2994 // jthread refers to a live JavaThread. 2995 Thread::set_priority(receiver, (ThreadPriority)prio); 2996 } 2997 // Implied else: If the JavaThread hasn't started yet, then the 2998 // priority set in the java.lang.Thread object above will be pushed 2999 // down when it does start. 3000 JVM_END 3001 3002 3003 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3004 HOTSPOT_THREAD_YIELD(); 3005 os::naked_yield(); 3006 JVM_END 3007 3008 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos)) 3009 if (nanos < 0) { 3010 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range"); 3011 } 3012 3013 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3014 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3015 } 3016 3017 // Save current thread state and restore it at the end of this block. 3018 // And set new thread state to SLEEPING. 3019 JavaThreadSleepState jtss(thread); 3020 3021 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC); 3022 3023 if (nanos == 0) { 3024 os::naked_yield(); 3025 } else { 3026 ThreadState old_state = thread->osthread()->get_state(); 3027 thread->osthread()->set_state(SLEEPING); 3028 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed 3029 // An asynchronous exception could have been thrown on 3030 // us while we were sleeping. We do not overwrite those. 3031 if (!HAS_PENDING_EXCEPTION) { 3032 HOTSPOT_THREAD_SLEEP_END(1); 3033 if (!thread->has_async_exception_condition()) { 3034 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3035 // to properly restore the thread state. That's likely wrong. 3036 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3037 } 3038 } 3039 } 3040 thread->osthread()->set_state(old_state); 3041 } 3042 HOTSPOT_THREAD_SLEEP_END(0); 3043 JVM_END 3044 3045 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3046 oop jthread = thread->threadObj(); 3047 assert(jthread != nullptr, "no current carrier thread!"); 3048 return JNIHandles::make_local(THREAD, jthread); 3049 JVM_END 3050 3051 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3052 oop theThread = thread->vthread(); 3053 assert(theThread != (oop)nullptr, "no current thread!"); 3054 return JNIHandles::make_local(THREAD, theThread); 3055 JVM_END 3056 3057 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3058 jobject theThread)) 3059 oop threadObj = JNIHandles::resolve(theThread); 3060 thread->set_vthread(threadObj); 3061 3062 // Set _monitor_owner_id of new current Thread 3063 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj)); 3064 3065 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3066 JVM_END 3067 3068 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3069 return ThreadIdentifier::unsafe_offset(); 3070 JVM_END 3071 3072 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3073 ThreadsListHandle tlh(thread); 3074 JavaThread* receiver = nullptr; 3075 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3076 if (is_alive) { 3077 // jthread refers to a live JavaThread. 3078 receiver->interrupt(); 3079 } 3080 JVM_END 3081 3082 // Return true iff the current thread has locked the object passed in 3083 3084 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3085 if (obj == nullptr) { 3086 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3087 } 3088 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3089 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3090 JVM_END 3091 3092 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3093 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD); 3094 return JNIHandles::make_local(THREAD, trace); 3095 JVM_END 3096 3097 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread)) 3098 #if INCLUDE_JVMTI 3099 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD); 3100 return JNIHandles::make_local(THREAD, snapshot); 3101 #else 3102 THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException()); 3103 #endif 3104 JVM_END 3105 3106 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3107 // We don't use a ThreadsListHandle here because the current thread 3108 // must be alive. 3109 oop java_thread = JNIHandles::resolve_non_null(jthread); 3110 JavaThread* thr = java_lang_Thread::thread(java_thread); 3111 if (thread == thr && !thr->has_attached_via_jni()) { 3112 // Thread naming is only supported for the current thread and 3113 // we don't set the name of an attached thread to avoid stepping 3114 // on other programs. 3115 ResourceMark rm(thread); 3116 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3117 os::set_native_thread_name(thread_name); 3118 } 3119 JVM_END 3120 3121 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3122 oop theCache = thread->scopedValueCache(); 3123 return JNIHandles::make_local(THREAD, theCache); 3124 JVM_END 3125 3126 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3127 jobject theCache)) 3128 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3129 thread->set_scopedValueCache(objs); 3130 JVM_END 3131 3132 3133 // java.lang.Package //////////////////////////////////////////////////////////////// 3134 3135 3136 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3137 ResourceMark rm(THREAD); 3138 JvmtiVMObjectAllocEventCollector oam; 3139 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3140 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3141 return (jstring) JNIHandles::make_local(THREAD, result); 3142 JVM_END 3143 3144 3145 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3146 JvmtiVMObjectAllocEventCollector oam; 3147 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3148 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3149 JVM_END 3150 3151 3152 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3153 3154 3155 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3156 MonitorLocker ml(Heap_lock); 3157 oop ref = Universe::reference_pending_list(); 3158 if (ref != nullptr) { 3159 Universe::clear_reference_pending_list(); 3160 } 3161 return JNIHandles::make_local(THREAD, ref); 3162 JVM_END 3163 3164 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3165 MonitorLocker ml(Heap_lock); 3166 return Universe::has_reference_pending_list(); 3167 JVM_END 3168 3169 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3170 MonitorLocker ml(Heap_lock); 3171 while (!Universe::has_reference_pending_list()) { 3172 ml.wait(); 3173 } 3174 JVM_END 3175 3176 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref)) 3177 oop ref_oop = JNIHandles::resolve_non_null(ref); 3178 // PhantomReference has its own implementation of get(). 3179 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3180 oop referent = java_lang_ref_Reference::weak_referent(ref_oop); 3181 return JNIHandles::make_local(THREAD, referent); 3182 JVM_END 3183 3184 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3185 oop ref_oop = JNIHandles::resolve_non_null(ref); 3186 // PhantomReference has its own implementation of refersTo(). 3187 // See: JVM_PhantomReferenceRefersTo 3188 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3189 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3190 return referent == JNIHandles::resolve(o); 3191 JVM_END 3192 3193 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3194 oop ref_oop = JNIHandles::resolve_non_null(ref); 3195 // FinalReference has it's own implementation of clear(). 3196 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3197 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3198 // If the referent has already been cleared then done. 3199 // However, if the referent is dead but has not yet been cleared by 3200 // concurrent reference processing, it should NOT be cleared here. 3201 // Instead, clearing should be left to the GC. Clearing it here could 3202 // detectably lose an expected notification, which is impossible with 3203 // STW reference processing. The clearing in enqueue() doesn't have 3204 // this problem, since the enqueue covers the notification, but it's not 3205 // worth the effort to handle that case specially. 3206 return; 3207 } 3208 java_lang_ref_Reference::clear_referent(ref_oop); 3209 JVM_END 3210 3211 3212 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3213 3214 3215 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3216 oop ref_oop = JNIHandles::resolve_non_null(ref); 3217 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3218 return referent == JNIHandles::resolve(o); 3219 JVM_END 3220 3221 3222 // ObjectInputStream /////////////////////////////////////////////////////////////// 3223 3224 // Return the first user-defined class loader up the execution stack, or null 3225 // if only code from the bootstrap or platform class loader is on the stack. 3226 3227 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3228 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3229 InstanceKlass* ik = vfst.method()->method_holder(); 3230 oop loader = ik->class_loader(); 3231 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3232 return JNIHandles::make_local(THREAD, loader); 3233 } 3234 } 3235 return nullptr; 3236 JVM_END 3237 3238 3239 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3240 3241 3242 // resolve array handle and check arguments 3243 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3244 if (arr == nullptr) { 3245 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3246 } 3247 oop a = JNIHandles::resolve_non_null(arr); 3248 if (!a->is_array()) { 3249 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3250 } else if (type_array_only && !a->is_typeArray()) { 3251 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3252 } 3253 return arrayOop(a); 3254 } 3255 3256 3257 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3258 arrayOop a = check_array(env, arr, false, CHECK_0); 3259 return a->length(); 3260 JVM_END 3261 3262 3263 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3264 JvmtiVMObjectAllocEventCollector oam; 3265 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3266 jvalue value; 3267 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3268 oop box = Reflection::box(&value, type, CHECK_NULL); 3269 return JNIHandles::make_local(THREAD, box); 3270 JVM_END 3271 3272 3273 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3274 jvalue value; 3275 value.i = 0; // to initialize value before getting used in CHECK 3276 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3277 assert(a->is_typeArray(), "just checking"); 3278 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3279 BasicType wide_type = (BasicType) wCode; 3280 if (type != wide_type) { 3281 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3282 } 3283 return value; 3284 JVM_END 3285 3286 3287 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3288 arrayOop a = check_array(env, arr, false, CHECK); 3289 oop box = JNIHandles::resolve(val); 3290 jvalue value; 3291 value.i = 0; // to initialize value before getting used in CHECK 3292 BasicType value_type; 3293 if (a->is_objArray()) { 3294 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3295 value_type = Reflection::unbox_for_regular_object(box, &value); 3296 } else { 3297 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3298 } 3299 Reflection::array_set(&value, a, index, value_type, CHECK); 3300 JVM_END 3301 3302 3303 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3304 arrayOop a = check_array(env, arr, true, CHECK); 3305 assert(a->is_typeArray(), "just checking"); 3306 BasicType value_type = (BasicType) vCode; 3307 Reflection::array_set(&v, a, index, value_type, CHECK); 3308 JVM_END 3309 3310 3311 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3312 JvmtiVMObjectAllocEventCollector oam; 3313 oop element_mirror = JNIHandles::resolve(eltClass); 3314 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3315 return JNIHandles::make_local(THREAD, result); 3316 JVM_END 3317 3318 3319 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3320 JvmtiVMObjectAllocEventCollector oam; 3321 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3322 oop element_mirror = JNIHandles::resolve(eltClass); 3323 assert(dim_array->is_typeArray(), "just checking"); 3324 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3325 return JNIHandles::make_local(THREAD, result); 3326 JVM_END 3327 3328 3329 // Library support /////////////////////////////////////////////////////////////////////////// 3330 3331 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3332 return ZipLibrary::handle(); 3333 JVM_END 3334 3335 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3336 //%note jvm_ct 3337 char ebuf[1024]; 3338 void *load_result; 3339 { 3340 ThreadToNativeFromVM ttnfvm(thread); 3341 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3342 } 3343 if (load_result == nullptr) { 3344 if (throwException) { 3345 char msg[1024]; 3346 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3347 // Since 'ebuf' may contain a string encoded using 3348 // platform encoding scheme, we need to pass 3349 // Exceptions::unsafe_to_utf8 to the new_exception method 3350 // as the last argument. See bug 6367357. 3351 Handle h_exception = 3352 Exceptions::new_exception(thread, 3353 vmSymbols::java_lang_UnsatisfiedLinkError(), 3354 msg, Exceptions::unsafe_to_utf8); 3355 3356 THROW_HANDLE_NULL(h_exception); 3357 } else { 3358 log_info(library)("Failed to load library %s", name); 3359 return load_result; 3360 } 3361 } 3362 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3363 return load_result; 3364 JVM_END 3365 3366 3367 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3368 os::dll_unload(handle); 3369 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3370 JVM_END 3371 3372 3373 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3374 void* find_result = os::dll_lookup(handle, name); 3375 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3376 find_result != nullptr ? "Found" : "Failed to find", 3377 name, p2i(handle)); 3378 return find_result; 3379 JVM_END 3380 3381 3382 // JNI version /////////////////////////////////////////////////////////////////////////////// 3383 3384 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3385 return Threads::is_supported_jni_version_including_1_1(version); 3386 JVM_END 3387 3388 3389 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3390 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3391 JVM_END 3392 3393 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void)) 3394 return Arguments::is_valhalla_enabled() ? JNI_TRUE : JNI_FALSE; 3395 JVM_END 3396 3397 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3398 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3399 JVM_END 3400 3401 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void)) 3402 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE; 3403 JVM_END 3404 3405 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void)) 3406 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE; 3407 JVM_END 3408 3409 // String support /////////////////////////////////////////////////////////////////////////// 3410 3411 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3412 JvmtiVMObjectAllocEventCollector oam; 3413 if (str == nullptr) return nullptr; 3414 oop string = JNIHandles::resolve_non_null(str); 3415 oop result = StringTable::intern(string, CHECK_NULL); 3416 return (jstring) JNIHandles::make_local(THREAD, result); 3417 JVM_END 3418 3419 3420 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3421 3422 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3423 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3424 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3425 // in the safepoint protocol, thread suspension, thread interruption, or most things of that 3426 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has 3427 // shutdown. JavaThreads will be "in native" when using this API from JDK code. 3428 3429 3430 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3431 VM_Exit::block_if_vm_exited(); 3432 return new PlatformMutex(); 3433 } 3434 3435 3436 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3437 VM_Exit::block_if_vm_exited(); 3438 delete ((PlatformMutex*) mon); 3439 } 3440 3441 3442 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3443 VM_Exit::block_if_vm_exited(); 3444 ((PlatformMutex*) mon)->lock(); 3445 return 0; 3446 } 3447 3448 3449 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3450 VM_Exit::block_if_vm_exited(); 3451 ((PlatformMutex*) mon)->unlock(); 3452 } 3453 3454 3455 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3456 3457 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3458 Handle loader, jboolean throwError, TRAPS) { 3459 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL); 3460 3461 // Check if we should initialize the class 3462 if (init && klass->is_instance_klass()) { 3463 klass->initialize(CHECK_NULL); 3464 } 3465 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3466 } 3467 3468 3469 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3470 3471 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3472 Handle method_handle; 3473 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3474 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3475 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3476 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3477 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???"); 3478 3479 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3480 jobject res = JNIHandles::make_local(THREAD, result); 3481 if (JvmtiExport::should_post_vm_object_alloc()) { 3482 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3483 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3484 if (java_lang_Class::is_primitive(ret_type)) { 3485 // Only for primitive type vm allocates memory for java object. 3486 // See box() method. 3487 JvmtiExport::post_vm_object_alloc(thread, result); 3488 } 3489 } 3490 return res; 3491 } else { 3492 THROW_NULL(vmSymbols::java_lang_StackOverflowError()); 3493 } 3494 JVM_END 3495 3496 3497 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3498 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3499 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???"); 3500 oop constructor_mirror = JNIHandles::resolve(c); 3501 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3502 jobject res = JNIHandles::make_local(THREAD, result); 3503 if (JvmtiExport::should_post_vm_object_alloc()) { 3504 JvmtiExport::post_vm_object_alloc(thread, result); 3505 } 3506 return res; 3507 JVM_END 3508 3509 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3510 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3511 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3512 JVM_END 3513 3514 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3515 jclass caller, 3516 jstring interfaceMethodName, 3517 jobject factoryType, 3518 jobject interfaceMethodType, 3519 jobject implementationMember, 3520 jobject dynamicMethodType, 3521 jclass lambdaProxyClass)) 3522 #if INCLUDE_CDS 3523 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) { 3524 return; 3525 } 3526 3527 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller)); 3528 if (caller_ik->is_hidden()) { 3529 // Hidden classes not of type lambda proxy classes are currently not being archived. 3530 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3531 // registered for archiving. 3532 return; 3533 } 3534 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass)); 3535 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3536 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3537 3538 Symbol* interface_method_name = nullptr; 3539 if (interfaceMethodName != nullptr) { 3540 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3541 } 3542 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3543 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3544 3545 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3546 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3547 3548 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3549 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3550 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3551 3552 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3553 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3554 3555 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3556 interface_method_type, m, dynamic_method_type, THREAD); 3557 #endif // INCLUDE_CDS 3558 JVM_END 3559 3560 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3561 jclass caller, 3562 jstring interfaceMethodName, 3563 jobject factoryType, 3564 jobject interfaceMethodType, 3565 jobject implementationMember, 3566 jobject dynamicMethodType)) 3567 #if INCLUDE_CDS 3568 3569 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3570 implementationMember == nullptr || dynamicMethodType == nullptr) { 3571 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3572 } 3573 3574 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller)); 3575 if (!caller_ik->in_aot_cache()) { 3576 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3577 return nullptr; 3578 } 3579 3580 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3581 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3582 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3583 3584 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3585 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3586 3587 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3588 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3589 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3590 3591 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3592 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3593 3594 InstanceKlass* loaded_lambda = 3595 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3596 interface_method_type, m, dynamic_method_type, 3597 CHECK_(nullptr)); 3598 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3599 #else 3600 return nullptr; 3601 #endif // INCLUDE_CDS 3602 JVM_END 3603 3604 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3605 if (CDSConfig::is_dumping_static_archive()) { 3606 // We do this so that the default CDS archive can be deterministic. 3607 const char* release = VM_Version::vm_release(); 3608 const char* dbg_level = VM_Version::jdk_debug_level(); 3609 const char* version = VM_Version::internal_vm_info_string(); 3610 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3611 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3612 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3613 seed += (jlong)VM_Version::vm_major_version(); 3614 seed += (jlong)VM_Version::vm_minor_version(); 3615 seed += (jlong)VM_Version::vm_security_version(); 3616 seed += (jlong)VM_Version::vm_patch_version(); 3617 if (seed == 0) { // don't let this ever be zero. 3618 seed = 0x87654321; 3619 } 3620 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3621 return seed; 3622 } else { 3623 return 0; 3624 } 3625 JVM_END 3626 3627 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus()) 3628 return CDSConfig::get_status(); 3629 JVM_END 3630 3631 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3632 #if INCLUDE_CDS 3633 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity"); 3634 if (line != nullptr) { 3635 ResourceMark rm(THREAD); 3636 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3637 char* c_line = java_lang_String::as_utf8_string(h_line()); 3638 if (CDSConfig::is_dumping_dynamic_archive()) { 3639 // Note: LambdaFormInvokers::append take same format which is not 3640 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3641 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3642 } 3643 if (ClassListWriter::is_enabled()) { 3644 ClassListWriter w; 3645 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line); 3646 } 3647 } 3648 #endif // INCLUDE_CDS 3649 JVM_END 3650 3651 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3652 #if INCLUDE_CDS 3653 ResourceMark rm(THREAD); 3654 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3655 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3656 AOTMetaspace::dump_loaded_classes(file_name, THREAD); 3657 #endif // INCLUDE_CDS 3658 JVM_END 3659 3660 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3661 #if INCLUDE_CDS 3662 ResourceMark rm(THREAD); 3663 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3664 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3665 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3666 #endif // INCLUDE_CDS 3667 JVM_END 3668 3669 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls)) 3670 #if INCLUDE_CDS 3671 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3672 if (!k->is_instance_klass()) { 3673 return false; 3674 } else { 3675 if (InstanceKlass::cast(k)->is_enum_subclass() || 3676 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) { 3677 // This class will be cached in AOT-initialized state. No need for init barriers. 3678 return false; 3679 } else { 3680 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles 3681 // must emit barriers to ensure class initialization during production run. 3682 ResourceMark rm(THREAD); 3683 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name()); 3684 return true; 3685 } 3686 } 3687 #else 3688 return false; 3689 #endif // INCLUDE_CDS 3690 JVM_END 3691 3692 // Returns an array of all live Thread objects (VM internal JavaThreads, 3693 // jvmti agent threads, and JNI attaching threads are skipped) 3694 // See CR 6404306 regarding JNI attaching threads 3695 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3696 ResourceMark rm(THREAD); 3697 ThreadsListEnumerator tle(THREAD, false, false); 3698 JvmtiVMObjectAllocEventCollector oam; 3699 3700 int num_threads = tle.num_threads(); 3701 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3702 objArrayHandle threads_ah(THREAD, r); 3703 3704 for (int i = 0; i < num_threads; i++) { 3705 Handle h = tle.get_threadObj(i); 3706 threads_ah->obj_at_put(i, h()); 3707 } 3708 3709 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3710 JVM_END 3711 3712 3713 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3714 // Return StackTraceElement[][], each element is the stack trace of a thread in 3715 // the corresponding entry in the given threads array 3716 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3717 JvmtiVMObjectAllocEventCollector oam; 3718 3719 // Check if threads is null 3720 if (threads == nullptr) { 3721 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3722 } 3723 3724 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3725 objArrayHandle ah(THREAD, a); 3726 int num_threads = ah->length(); 3727 // check if threads is non-empty array 3728 if (num_threads == 0) { 3729 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3730 } 3731 3732 // check if threads is not an array of objects of Thread class 3733 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3734 if (k != vmClasses::Thread_klass()) { 3735 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3736 } 3737 refArrayHandle rah(THREAD, (refArrayOop)ah()); // j.l.Thread is an identity class, arrays are always reference arrays 3738 3739 ResourceMark rm(THREAD); 3740 3741 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3742 for (int i = 0; i < num_threads; i++) { 3743 oop thread_obj = rah->obj_at(i); 3744 instanceHandle h(THREAD, (instanceOop) thread_obj); 3745 thread_handle_array->append(h); 3746 } 3747 3748 // The JavaThread references in thread_handle_array are validated 3749 // in VM_ThreadDump::doit(). 3750 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3751 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3752 3753 JVM_END 3754 3755 // JVM monitoring and management support 3756 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3757 return Management::get_jmm_interface(version); 3758 JVM_END 3759 3760 // com.sun.tools.attach.VirtualMachine agent properties support 3761 // 3762 // Initialize the agent properties with the properties maintained in the VM 3763 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3764 ResourceMark rm; 3765 3766 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3767 3768 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3769 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3770 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3771 return properties; 3772 JVM_END 3773 3774 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3775 { 3776 JvmtiVMObjectAllocEventCollector oam; 3777 3778 if (ofClass == nullptr) { 3779 return nullptr; 3780 } 3781 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3782 // Special handling for primitive objects 3783 if (java_lang_Class::is_primitive(mirror())) { 3784 return nullptr; 3785 } 3786 Klass* k = java_lang_Class::as_Klass(mirror()); 3787 if (!k->is_instance_klass()) { 3788 return nullptr; 3789 } 3790 InstanceKlass* ik = InstanceKlass::cast(k); 3791 int encl_method_class_idx = ik->enclosing_method_class_index(); 3792 if (encl_method_class_idx == 0) { 3793 return nullptr; 3794 } 3795 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3796 objArrayHandle dest(THREAD, dest_o); 3797 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3798 dest->obj_at_put(0, enc_k->java_mirror()); 3799 int encl_method_method_idx = ik->enclosing_method_method_index(); 3800 if (encl_method_method_idx != 0) { 3801 Symbol* sym = ik->constants()->symbol_at( 3802 extract_low_short_from_int( 3803 ik->constants()->name_and_type_at(encl_method_method_idx))); 3804 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3805 dest->obj_at_put(1, str()); 3806 sym = ik->constants()->symbol_at( 3807 extract_high_short_from_int( 3808 ik->constants()->name_and_type_at(encl_method_method_idx))); 3809 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3810 dest->obj_at_put(2, str()); 3811 } 3812 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3813 } 3814 JVM_END 3815 3816 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3817 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3818 ResourceMark rm(THREAD); 3819 3820 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3821 return nullptr; 3822 } 3823 3824 char** vm_flags = Arguments::jvm_flags_array(); 3825 char** vm_args = Arguments::jvm_args_array(); 3826 int num_flags = Arguments::num_jvm_flags(); 3827 int num_args = Arguments::num_jvm_args(); 3828 3829 InstanceKlass* ik = vmClasses::String_klass(); 3830 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3831 objArrayHandle result_h(THREAD, r); 3832 3833 int index = 0; 3834 for (int j = 0; j < num_flags; j++, index++) { 3835 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3836 result_h->obj_at_put(index, h()); 3837 } 3838 for (int i = 0; i < num_args; i++, index++) { 3839 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3840 result_h->obj_at_put(index, h()); 3841 } 3842 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 3843 JVM_END 3844 3845 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 3846 return os::get_signal_number(name); 3847 JVM_END 3848 3849 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread)) 3850 oop vt = JNIHandles::resolve_external_guard(vthread); 3851 MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/); 3852 JVM_END 3853 3854 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread)) 3855 oop vt = JNIHandles::resolve_external_guard(vthread); 3856 MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/); 3857 JVM_END 3858 3859 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount)) 3860 oop vt = JNIHandles::resolve_external_guard(vthread); 3861 MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/); 3862 JVM_END 3863 3864 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount)) 3865 oop vt = JNIHandles::resolve_external_guard(vthread); 3866 MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/); 3867 JVM_END 3868 3869 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section. 3870 // Needed to avoid deadlocks with JVMTI suspend mechanism. 3871 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter)) 3872 #if INCLUDE_JVMTI 3873 if (!DoJVMTIVirtualThreadTransitions) { 3874 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3875 return; 3876 } 3877 assert(thread->is_disable_suspend() != (bool)enter, 3878 "nested or unbalanced monitor enter/exit is not allowed"); 3879 thread->toggle_is_disable_suspend(); 3880 #endif 3881 JVM_END 3882 3883 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op)) 3884 #if INCLUDE_JFR 3885 freeze_result result = THREAD->last_freeze_fail_result(); 3886 assert(result != freeze_ok, "sanity check"); 3887 EventVirtualThreadPinned event(UNTIMED); 3888 event.set_starttime(THREAD->last_freeze_fail_time()); 3889 if (event.should_commit()) { 3890 ResourceMark rm(THREAD); 3891 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op)); 3892 THREAD->post_vthread_pinned_event(&event, str, result); 3893 } 3894 #endif 3895 JVM_END 3896 3897 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored)) 3898 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent(); 3899 assert(parkEvent != nullptr, "not initialized"); 3900 3901 OopHandle& list_head = ObjectMonitor::vthread_list_head(); 3902 oop vthread_head = nullptr; 3903 while (true) { 3904 if (list_head.peek() != nullptr) { 3905 for (;;) { 3906 oop head = list_head.resolve(); 3907 if (list_head.cmpxchg(head, nullptr) == head) { 3908 return JNIHandles::make_local(THREAD, head); 3909 } 3910 } 3911 } 3912 ThreadBlockInVM tbivm(THREAD); 3913 parkEvent->park(); 3914 } 3915 JVM_END 3916 3917 /* 3918 * Return the current class's class file version. The low order 16 bits of the 3919 * returned jint contain the class's major version. The high order 16 bits 3920 * contain the class's minor version. 3921 */ 3922 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 3923 oop mirror = JNIHandles::resolve_non_null(current); 3924 if (java_lang_Class::is_primitive(mirror)) { 3925 // return latest major version and minor version of 0. 3926 return JVM_CLASSFILE_MAJOR_VERSION; 3927 } 3928 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 3929 return (ik->minor_version() << 16) | ik->major_version(); 3930 JVM_END 3931 3932 /* 3933 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 3934 * get the value will see a materialized value and not a scalar-replaced 3935 * null value. 3936 */ 3937 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 3938 JVM_EnsureMaterializedForStackWalk(env, value); 3939 JVM_END 3940 3941 /* 3942 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded. 3943 */ 3944 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void)) 3945 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE; 3946 JVM_END --- EOF ---