1 /* 2 * Copyright (c) 1997, 2025, 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/os.inline.hpp" 90 #include "runtime/osThread.hpp" 91 #include "runtime/perfData.hpp" 92 #include "runtime/reflection.hpp" 93 #include "runtime/synchronizer.hpp" 94 #include "runtime/threadIdentifier.hpp" 95 #include "runtime/threadSMR.hpp" 96 #include "runtime/vframe.inline.hpp" 97 #include "runtime/vm_version.hpp" 98 #include "runtime/vmOperations.hpp" 99 #include "services/attachListener.hpp" 100 #include "services/management.hpp" 101 #include "services/threadService.hpp" 102 #include "utilities/checkedCast.hpp" 103 #include "utilities/copy.hpp" 104 #include "utilities/defaultStream.hpp" 105 #include "utilities/dtrace.hpp" 106 #include "utilities/events.hpp" 107 #include "utilities/macros.hpp" 108 #include "utilities/utf8.hpp" 109 #include "utilities/zipLibrary.hpp" 110 #if INCLUDE_CDS 111 #include "classfile/systemDictionaryShared.hpp" 112 #endif 113 #if INCLUDE_JFR 114 #include "jfr/jfr.hpp" 115 #endif 116 #if INCLUDE_MANAGEMENT 117 #include "services/finalizerService.hpp" 118 #endif 119 #ifdef LINUX 120 #include "osContainer_linux.hpp" 121 #endif 122 123 #include <errno.h> 124 125 /* 126 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 127 such ctors and calls MUST NOT come between an oop declaration/init and its 128 usage because if objects are move this may cause various memory stomps, bus 129 errors and segfaults. Here is a cookbook for causing so called "naked oop 130 failures": 131 132 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 133 // Object address to be held directly in mirror & not visible to GC 134 oop mirror = JNIHandles::resolve_non_null(ofClass); 135 136 // If this ctor can hit a safepoint, moving objects around, then 137 ComplexConstructor foo; 138 139 // Boom! mirror may point to JUNK instead of the intended object 140 (some dereference of mirror) 141 142 // Here's another call that may block for GC, making mirror stale 143 MutexLocker ml(some_lock); 144 145 // And here's an initializer that can result in a stale oop 146 // all in one step. 147 oop o = call_that_can_throw_exception(TRAPS); 148 149 150 The solution is to keep the oop declaration BELOW the ctor or function 151 call that might cause a GC, do another resolve to reassign the oop, or 152 consider use of a Handle instead of an oop so there is immunity from object 153 motion. But note that the "QUICK" entries below do not have a handlemark 154 and thus can only support use of handles passed in. 155 */ 156 157 extern void trace_class_resolution(Klass* to_class) { 158 ResourceMark rm; 159 int line_number = -1; 160 const char * source_file = nullptr; 161 const char * trace = "explicit"; 162 InstanceKlass* caller = nullptr; 163 JavaThread* jthread = JavaThread::current(); 164 if (jthread->has_last_Java_frame()) { 165 vframeStream vfst(jthread); 166 167 // Scan up the stack skipping ClassLoader frames. 168 Method* last_caller = nullptr; 169 170 while (!vfst.at_end()) { 171 Method* m = vfst.method(); 172 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) { 173 break; 174 } 175 last_caller = m; 176 vfst.next(); 177 } 178 // if this is called from Class.forName0 and that is called from Class.forName, 179 // then print the caller of Class.forName. If this is Class.loadClass, then print 180 // that caller, otherwise keep quiet since this should be picked up elsewhere. 181 bool found_it = false; 182 if (!vfst.at_end() && 183 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 184 vfst.method()->name() == vmSymbols::forName0_name()) { 185 vfst.next(); 186 if (!vfst.at_end() && 187 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 188 vfst.method()->name() == vmSymbols::forName_name()) { 189 vfst.next(); 190 found_it = true; 191 } 192 } else if (last_caller != nullptr && 193 last_caller->method_holder()->name() == 194 vmSymbols::java_lang_ClassLoader() && 195 last_caller->name() == vmSymbols::loadClass_name()) { 196 found_it = true; 197 } else if (!vfst.at_end()) { 198 if (vfst.method()->is_native()) { 199 // JNI call 200 found_it = true; 201 } 202 } 203 if (found_it && !vfst.at_end()) { 204 // found the caller 205 caller = vfst.method()->method_holder(); 206 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 207 if (line_number == -1) { 208 // show method name if it's a native method 209 trace = vfst.method()->name_and_sig_as_C_string(); 210 } 211 Symbol* s = caller->source_file_name(); 212 if (s != nullptr) { 213 source_file = s->as_C_string(); 214 } 215 } 216 } 217 if (caller != nullptr) { 218 if (to_class != caller) { 219 const char * from = caller->external_name(); 220 const char * to = to_class->external_name(); 221 // print in a single call to reduce interleaving between threads 222 if (source_file != nullptr) { 223 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 224 } else { 225 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 226 } 227 } 228 } 229 } 230 231 // java.lang.System ////////////////////////////////////////////////////////////////////// 232 233 234 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 235 return os::javaTimeMillis(); 236 JVM_END 237 238 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 239 return os::javaTimeNanos(); 240 JVM_END 241 242 // The function below is actually exposed by jdk.internal.misc.VM and not 243 // java.lang.System, but we choose to keep it here so that it stays next 244 // to JVM_CurrentTimeMillis and JVM_NanoTime 245 246 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 247 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 248 249 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 250 jlong seconds; 251 jlong nanos; 252 253 os::javaTimeSystemUTC(seconds, nanos); 254 255 // We're going to verify that the result can fit in a long. 256 // For that we need the difference in seconds between 'seconds' 257 // and 'offset_secs' to be such that: 258 // |seconds - offset_secs| < (2^63/10^9) 259 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 260 // which makes |seconds - offset_secs| < 2^33 261 // and we will prefer +/- 2^32 as the maximum acceptable diff 262 // as 2^32 has a more natural feel than 2^33... 263 // 264 // So if |seconds - offset_secs| >= 2^32 - we return a special 265 // sentinel value (-1) which the caller should take as an 266 // exception value indicating that the offset given to us is 267 // too far from range of the current time - leading to too big 268 // a nano adjustment. The caller is expected to recover by 269 // computing a more accurate offset and calling this method 270 // again. (For the record 2^32 secs is ~136 years, so that 271 // should rarely happen) 272 // 273 jlong diff = seconds - offset_secs; 274 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 275 return -1; // sentinel value: the offset is too far off the target 276 } 277 278 // return the adjustment. If you compute a time by adding 279 // this number of nanoseconds along with the number of seconds 280 // in the offset you should get the current UTC time. 281 return (diff * (jlong)1000000000) + nanos; 282 JVM_END 283 284 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 285 jobject dst, jint dst_pos, jint length)) 286 // Check if we have null pointers 287 if (src == nullptr || dst == nullptr) { 288 THROW(vmSymbols::java_lang_NullPointerException()); 289 } 290 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 291 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 292 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 293 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 294 // Do copy 295 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 296 JVM_END 297 298 299 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 300 JavaValue r(T_OBJECT); 301 // public synchronized Object put(Object key, Object value); 302 HandleMark hm(THREAD); 303 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 304 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK); 305 JavaCalls::call_virtual(&r, 306 props, 307 vmClasses::Properties_klass(), 308 vmSymbols::put_name(), 309 vmSymbols::object_object_object_signature(), 310 key_str, 311 value_str, 312 THREAD); 313 } 314 315 316 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 317 318 /* 319 * Return all of the system properties in a Java String array with alternating 320 * names and values from the jvm SystemProperty. 321 * Which includes some internal and all commandline -D defined properties. 322 */ 323 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 324 ResourceMark rm(THREAD); 325 HandleMark hm(THREAD); 326 int ndx = 0; 327 int fixedCount = 2; 328 329 SystemProperty* p = Arguments::system_properties(); 330 int count = Arguments::PropertyList_count(p); 331 332 // Allocate result String array 333 InstanceKlass* ik = vmClasses::String_klass(); 334 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 335 objArrayHandle result_h(THREAD, r); 336 337 while (p != nullptr) { 338 const char * key = p->key(); 339 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 340 const char * value = p->value(); 341 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 342 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL); 343 result_h->obj_at_put(ndx * 2, key_str()); 344 result_h->obj_at_put(ndx * 2 + 1, value_str()); 345 ndx++; 346 } 347 p = p->next(); 348 } 349 350 // Convert the -XX:MaxDirectMemorySize= command line flag 351 // to the sun.nio.MaxDirectMemorySize property. 352 // Do this after setting user properties to prevent people 353 // from setting the value with a -D option, as requested. 354 // Leave empty if not supplied 355 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 356 char as_chars[256]; 357 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 358 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 359 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 360 result_h->obj_at_put(ndx * 2, key_str()); 361 result_h->obj_at_put(ndx * 2 + 1, value_str()); 362 ndx++; 363 } 364 365 // JVM monitoring and management support 366 // Add the sun.management.compiler property for the compiler's name 367 { 368 #undef CSIZE 369 #if defined(_LP64) 370 #define CSIZE "64-Bit " 371 #else 372 #define CSIZE 373 #endif // 64bit 374 375 #if COMPILER1_AND_COMPILER2 376 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 377 #else 378 #if defined(COMPILER1) 379 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 380 #elif defined(COMPILER2) 381 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 382 #elif INCLUDE_JVMCI 383 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2" 384 #else 385 const char* compiler_name = ""; 386 #endif // compilers 387 #endif // COMPILER1_AND_COMPILER2 388 389 if (*compiler_name != '\0' && 390 (Arguments::mode() != Arguments::_int)) { 391 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 392 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 393 result_h->obj_at_put(ndx * 2, key_str()); 394 result_h->obj_at_put(ndx * 2 + 1, value_str()); 395 ndx++; 396 } 397 } 398 399 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 400 JVM_END 401 402 403 /* 404 * Return the temporary directory that the VM uses for the attach 405 * and perf data files. 406 * 407 * It is important that this directory is well-known and the 408 * same for all VM instances. It cannot be affected by configuration 409 * variables such as java.io.tmpdir. 410 */ 411 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 412 HandleMark hm(THREAD); 413 const char* temp_dir = os::get_temp_directory(); 414 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 415 return (jstring) JNIHandles::make_local(THREAD, h()); 416 JVM_END 417 418 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) { 419 if (len < 0) { 420 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative"); 421 } 422 elmClass->initialize(CHECK); 423 if (elmClass->is_array_klass() || elmClass->is_identity_class()) { 424 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class"); 425 } 426 if (elmClass->is_abstract()) { 427 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract"); 428 } 429 } 430 431 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to)) 432 oop o = JNIHandles::resolve_non_null(orig); 433 assert(o->is_array(), "Must be"); 434 oop array = nullptr; 435 arrayOop org = (arrayOop)o; 436 arrayHandle oh(THREAD, org); 437 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass()); 438 InlineKlass* vk = InlineKlass::cast(ak->element_klass()); 439 int len = to - from; // length of the new array 440 if (ak->is_null_free_array_klass()) { 441 if ((len != 0) && (from >= org->length() || to > org->length())) { 442 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements"); 443 } 444 } 445 if (org->is_flatArray()) { 446 FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass()); 447 LayoutKind lk = fak->layout_kind(); 448 ArrayKlass::ArrayProperties props = ArrayKlass::ArrayProperties::DEFAULT; 449 switch(lk) { 450 case LayoutKind::ATOMIC_FLAT: 451 props = ArrayKlass::ArrayProperties::NULL_RESTRICTED; 452 break; 453 case LayoutKind::NON_ATOMIC_FLAT: 454 props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED | ArrayKlass::ArrayProperties::NON_ATOMIC); 455 break; 456 case LayoutKind::NULLABLE_ATOMIC_FLAT: 457 props = ArrayKlass::ArrayProperties::NON_ATOMIC; 458 break; 459 default: 460 ShouldNotReachHere(); 461 } 462 array = oopFactory::new_flatArray(vk, len, props, lk, CHECK_NULL); 463 arrayHandle ah(THREAD, (arrayOop)array); 464 int end = to < oh()->length() ? to : oh()->length(); 465 for (int i = from; i < end; i++) { 466 void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper()); 467 void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper()); 468 vk->copy_payload_to_addr(src, dst, lk, false); 469 } 470 array = ah(); 471 } else { 472 ArrayKlass::ArrayProperties props = org->is_null_free_array() ? ArrayKlass::ArrayProperties::NULL_RESTRICTED : ArrayKlass::ArrayProperties::DEFAULT; 473 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL); 474 int end = to < oh()->length() ? to : oh()->length(); 475 for (int i = from; i < end; i++) { 476 if (i < ((objArrayOop)oh())->length()) { 477 ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i)); 478 } else { 479 assert(!ak->is_null_free_array_klass(), "Must be a nullable array"); 480 ((objArrayOop)array)->obj_at_put(i - from, nullptr); 481 } 482 } 483 } 484 return (jarray) JNIHandles::make_local(THREAD, array); 485 JVM_END 486 487 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal)) 488 oop mirror = JNIHandles::resolve_non_null(elmClass); 489 oop init = JNIHandles::resolve(initVal); 490 if (init == nullptr) { 491 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null"); 492 } 493 Handle init_h(THREAD, init); 494 Klass* klass = java_lang_Class::as_Klass(mirror); 495 if (klass != init_h()->klass()) { 496 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value"); 497 } 498 validate_array_arguments(klass, len, CHECK_NULL); 499 InlineKlass* vk = InlineKlass::cast(klass); 500 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NON_ATOMIC | ArrayKlass::ArrayProperties::NULL_RESTRICTED); 501 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL); 502 for (int i = 0; i < len; i++) { 503 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ ); 504 } 505 return (jarray) JNIHandles::make_local(THREAD, array); 506 JVM_END 507 508 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal)) 509 oop mirror = JNIHandles::resolve_non_null(elmClass); 510 oop init = JNIHandles::resolve(initVal); 511 if (init == nullptr) { 512 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null"); 513 } 514 Handle init_h(THREAD, init); 515 Klass* klass = java_lang_Class::as_Klass(mirror); 516 if (klass != init_h()->klass()) { 517 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value"); 518 } 519 validate_array_arguments(klass, len, CHECK_NULL); 520 InlineKlass* vk = InlineKlass::cast(klass); 521 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED); 522 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL); 523 for (int i = 0; i < len; i++) { 524 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ ); 525 } 526 return (jarray) JNIHandles::make_local(THREAD, array); 527 JVM_END 528 529 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len)) 530 oop mirror = JNIHandles::resolve_non_null(elmClass); 531 Klass* klass = java_lang_Class::as_Klass(mirror); 532 klass->initialize(CHECK_NULL); 533 validate_array_arguments(klass, len, CHECK_NULL); 534 InlineKlass* vk = InlineKlass::cast(klass); 535 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::DEFAULT); 536 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL); 537 return (jarray) JNIHandles::make_local(THREAD, array); 538 JVM_END 539 540 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj)) 541 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj)); 542 return oop->is_flatArray(); 543 JVM_END 544 545 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj)) 546 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj)); 547 return oop->is_null_free_array(); 548 JVM_END 549 550 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj)) 551 // There are multiple cases where an array can/must support atomic access: 552 // - the array is a reference array 553 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or ATOMIC_FLAT 554 // - the array is flat and its component type is naturally atomic 555 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj)); 556 if (oop->is_refArray()) return true; 557 if (oop->is_flatArray()) { 558 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass()); 559 if (fak->layout_kind() == LayoutKind::ATOMIC_FLAT || fak->layout_kind() == LayoutKind::NULLABLE_ATOMIC_FLAT) { 560 return true; 561 } 562 if (fak->element_klass()->is_naturally_atomic()) return true; 563 } 564 return false; 565 JVM_END 566 567 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 568 569 extern volatile jint vm_created; 570 571 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 572 EventShutdown event; 573 if (event.should_commit()) { 574 event.set_reason("Shutdown requested from Java"); 575 event.commit(); 576 } 577 JVM_END 578 579 580 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 581 before_exit(thread, true); 582 vm_exit(code); 583 JVM_END 584 585 586 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 587 if (!DisableExplicitGC) { 588 EventSystemGC event; 589 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent); 590 Universe::heap()->collect(GCCause::_java_lang_system_gc); 591 event.commit(); 592 } 593 JVM_END 594 595 596 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 597 return Universe::heap()->millis_since_last_whole_heap_examined(); 598 JVM_END 599 600 601 static inline jlong convert_size_t_to_jlong(size_t val) { 602 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 603 NOT_LP64 (return (jlong)val;) 604 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 605 } 606 607 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 608 size_t n = Universe::heap()->capacity(); 609 return convert_size_t_to_jlong(n); 610 JVM_END 611 612 613 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 614 size_t n = Universe::heap()->unused(); 615 return convert_size_t_to_jlong(n); 616 JVM_END 617 618 619 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 620 size_t n = Universe::heap()->max_capacity(); 621 return convert_size_t_to_jlong(n); 622 JVM_END 623 624 625 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 626 return os::active_processor_count(); 627 JVM_END 628 629 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void)) 630 #ifdef LINUX 631 if (UseContainerSupport) { 632 return JNI_TRUE; 633 } 634 #endif 635 return JNI_FALSE; 636 JVM_END 637 638 JVM_LEAF(jboolean, JVM_IsContainerized(void)) 639 #ifdef LINUX 640 if (OSContainer::is_containerized()) { 641 return JNI_TRUE; 642 } 643 #endif 644 return JNI_FALSE; 645 JVM_END 646 647 // java.lang.Throwable ////////////////////////////////////////////////////// 648 649 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 650 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 651 java_lang_Throwable::fill_in_stack_trace(exception); 652 JVM_END 653 654 // java.lang.NullPointerException /////////////////////////////////////////// 655 656 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 657 if (!ShowCodeDetailsInExceptionMessages) return nullptr; 658 659 oop exc = JNIHandles::resolve_non_null(throwable); 660 661 Method* method; 662 int bci; 663 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 664 return nullptr; 665 } 666 if (method->is_native()) { 667 return nullptr; 668 } 669 670 stringStream ss; 671 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 672 if (ok) { 673 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 674 return (jstring) JNIHandles::make_local(THREAD, result); 675 } else { 676 return nullptr; 677 } 678 JVM_END 679 680 // java.lang.StackTraceElement ////////////////////////////////////////////// 681 682 683 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth)) 684 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace)); 685 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 686 objArrayHandle stack_trace(THREAD, st); 687 // Fill in the allocated stack trace 688 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK); 689 JVM_END 690 691 692 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 693 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 694 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 695 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK); 696 JVM_END 697 698 699 // java.lang.StackWalker ////////////////////////////////////////////////////// 700 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj)) 701 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj)); 702 703 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr); 704 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr); 705 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info()); 706 if (!have_name) { 707 oop name = StringTable::intern(method->name(), CHECK); 708 java_lang_StackFrameInfo::set_name(stack_frame_info(), name); 709 } 710 if (!have_type) { 711 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK); 712 java_lang_StackFrameInfo::set_type(stack_frame_info(), type()); 713 } 714 JVM_END 715 716 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode, 717 jint skip_frames, jobject contScope, jobject cont, 718 jint buffer_size, jint start_index, jobjectArray frames)) 719 if (!thread->has_last_Java_frame()) { 720 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr); 721 } 722 723 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 724 Handle contScope_h(THREAD, JNIHandles::resolve(contScope)); 725 Handle cont_h(THREAD, JNIHandles::resolve(cont)); 726 // frames array is a ClassFrameInfo[] array when only getting caller reference, 727 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 728 // be null. 729 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 730 objArrayHandle frames_array_h(THREAD, fa); 731 732 if (frames_array_h->length() < buffer_size) { 733 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr); 734 } 735 736 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h, 737 buffer_size, start_index, frames_array_h, CHECK_NULL); 738 return JNIHandles::make_local(THREAD, result); 739 JVM_END 740 741 742 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor, 743 jint last_batch_count, jint buffer_size, jint start_index, 744 jobjectArray frames)) 745 // frames array is a ClassFrameInfo[] array when only getting caller reference, 746 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 747 // be null. 748 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 749 objArrayHandle frames_array_h(THREAD, fa); 750 751 if (frames_array_h->length() < buffer_size) { 752 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 753 } 754 755 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 756 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size, 757 start_index, frames_array_h, THREAD); 758 JVM_END 759 760 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont)) 761 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 762 objArrayHandle frames_array_h(THREAD, fa); 763 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 764 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont)); 765 766 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD); 767 JVM_END 768 769 // java.lang.Object /////////////////////////////////////////////// 770 771 772 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 773 // as implemented in the classic virtual machine; return 0 if object is null 774 if (handle == nullptr) { 775 return 0; 776 } 777 oop obj = JNIHandles::resolve_non_null(handle); 778 if (EnableValhalla && obj->klass()->is_inline_klass()) { 779 JavaValue result(T_INT); 780 JavaCallArguments args; 781 Handle ho(THREAD, obj); 782 args.push_oop(ho); 783 methodHandle method(THREAD, Universe::value_object_hash_code_method()); 784 JavaCalls::call(&result, method, &args, THREAD); 785 if (HAS_PENDING_EXCEPTION) { 786 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) { 787 Handle e(THREAD, PENDING_EXCEPTION); 788 CLEAR_PENDING_EXCEPTION; 789 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false); 790 } 791 } 792 return result.get_jint(); 793 } else { 794 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj)); 795 } 796 JVM_END 797 798 799 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 800 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 801 ObjectSynchronizer::wait(obj, ms, CHECK); 802 JVM_END 803 804 805 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 806 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 807 ObjectSynchronizer::notify(obj, CHECK); 808 JVM_END 809 810 811 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 812 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 813 ObjectSynchronizer::notifyall(obj, CHECK); 814 JVM_END 815 816 817 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 818 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 819 Klass* klass = obj->klass(); 820 JvmtiVMObjectAllocEventCollector oam; 821 822 #ifdef ASSERT 823 // Just checking that the cloneable flag is set correct 824 if (obj->is_array()) { 825 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 826 } else { 827 guarantee(obj->is_instance(), "should be instanceOop"); 828 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 829 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 830 } 831 #endif 832 833 // Check if class of obj supports the Cloneable interface. 834 // All arrays are considered to be cloneable (See JLS 20.1.5). 835 // All j.l.r.Reference classes are considered non-cloneable. 836 if (!klass->is_cloneable() || 837 (klass->is_instance_klass() && 838 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 839 ResourceMark rm(THREAD); 840 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 841 } 842 843 if (klass->is_inline_klass()) { 844 // Value instances have no identity, so return the current instance instead of allocating a new one 845 // Value classes cannot have finalizers, so the method can return immediately 846 return JNIHandles::make_local(THREAD, obj()); 847 } 848 849 // Make shallow object copy 850 const size_t size = obj->size(); 851 oop new_obj_oop = nullptr; 852 if (obj->is_array()) { 853 const int length = ((arrayOop)obj())->length(); 854 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 855 /* do_zero */ true, CHECK_NULL); 856 } else { 857 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 858 } 859 860 HeapAccess<>::clone(obj(), new_obj_oop, size); 861 862 Handle new_obj(THREAD, new_obj_oop); 863 // Caution: this involves a java upcall, so the clone should be 864 // "gc-robust" by this stage. 865 if (klass->has_finalizer()) { 866 assert(obj->is_instance(), "should be instanceOop"); 867 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 868 new_obj = Handle(THREAD, new_obj_oop); 869 } 870 871 return JNIHandles::make_local(THREAD, new_obj()); 872 JVM_END 873 874 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 875 876 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 877 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 878 JVM_END 879 880 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 881 return InstanceKlass::is_finalization_enabled(); 882 JVM_END 883 884 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 885 886 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 887 CONT_RegisterNativeMethods(env, cls); 888 JVM_END 889 890 // java.io.File /////////////////////////////////////////////////////////////// 891 892 JVM_LEAF(char*, JVM_NativePath(char* path)) 893 return os::native_path(path); 894 JVM_END 895 896 897 // Misc. class handling /////////////////////////////////////////////////////////// 898 899 900 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 901 // Getting the class of the caller frame. 902 // 903 // The call stack at this point looks something like this: 904 // 905 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ] 906 // [1] [ @CallerSensitive API.method ] 907 // [.] [ (skipped intermediate frames) ] 908 // [n] [ caller ] 909 vframeStream vfst(thread); 910 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 911 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 912 Method* m = vfst.method(); 913 assert(m != nullptr, "sanity"); 914 switch (n) { 915 case 0: 916 // This must only be called from Reflection.getCallerClass 917 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 918 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 919 } 920 // fall-through 921 case 1: 922 // Frame 0 and 1 must be caller sensitive. 923 if (!m->caller_sensitive()) { 924 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 925 } 926 break; 927 default: 928 if (!m->is_ignored_by_security_stack_walk()) { 929 // We have reached the desired frame; return the holder class. 930 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 931 } 932 break; 933 } 934 } 935 return nullptr; 936 JVM_END 937 938 939 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 940 oop mirror = nullptr; 941 BasicType t = name2type(utf); 942 if (t != T_ILLEGAL && !is_reference_type(t)) { 943 mirror = Universe::java_mirror(t); 944 } 945 if (mirror == nullptr) { 946 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 947 } else { 948 return (jclass) JNIHandles::make_local(THREAD, mirror); 949 } 950 JVM_END 951 952 953 // Returns a class loaded by the bootstrap class loader; or null 954 // if not found. ClassNotFoundException is not thrown. 955 // FindClassFromBootLoader is exported to the launcher for windows. 956 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 957 const char* name)) 958 // Java libraries should ensure that name is never null or illegal. 959 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 960 // It's impossible to create this class; the name cannot fit 961 // into the constant pool. 962 return nullptr; 963 } 964 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name"); 965 966 TempNewSymbol h_name = SymbolTable::new_symbol(name); 967 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 968 if (k == nullptr) { 969 return nullptr; 970 } 971 972 if (log_is_enabled(Debug, class, resolve)) { 973 trace_class_resolution(k); 974 } 975 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 976 JVM_END 977 978 // Find a class with this name in this loader, using the caller's protection domain. 979 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 980 jboolean init, jobject loader, 981 jclass caller)) 982 TempNewSymbol h_name = 983 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 984 CHECK_NULL); 985 986 oop loader_oop = JNIHandles::resolve(loader); 987 oop from_class = JNIHandles::resolve(caller); 988 Handle h_loader(THREAD, loader_oop); 989 990 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 991 false, THREAD); 992 993 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 994 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 995 } 996 return result; 997 JVM_END 998 999 // Currently only called from the old verifier. 1000 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 1001 jboolean init, jclass from)) 1002 TempNewSymbol h_name = 1003 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 1004 CHECK_NULL); 1005 oop from_class_oop = JNIHandles::resolve(from); 1006 Klass* from_class = (from_class_oop == nullptr) 1007 ? (Klass*)nullptr 1008 : java_lang_Class::as_Klass(from_class_oop); 1009 oop class_loader = nullptr; 1010 if (from_class != nullptr) { 1011 class_loader = from_class->class_loader(); 1012 } 1013 Handle h_loader(THREAD, class_loader); 1014 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread); 1015 1016 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1017 // this function is generally only used for class loading during verification. 1018 ResourceMark rm; 1019 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name(); 1020 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name(); 1021 log_debug(class, resolve)("%s %s (verification)", from_name, to_name); 1022 } 1023 1024 #if INCLUDE_CDS 1025 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) { 1026 InstanceKlass* ik = InstanceKlass::cast(from_class); 1027 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name); 1028 } 1029 #endif 1030 1031 return result; 1032 JVM_END 1033 1034 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 1035 static jclass jvm_define_class_common(const char *name, 1036 jobject loader, const jbyte *buf, 1037 jsize len, jobject pd, const char *source, 1038 TRAPS) { 1039 if (source == nullptr) source = "__JVM_DefineClass__"; 1040 1041 JavaThread* jt = THREAD; 1042 1043 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 1044 ClassLoader::perf_define_appclass_selftime(), 1045 ClassLoader::perf_define_appclasses(), 1046 jt->get_thread_stat()->perf_recursion_counts_addr(), 1047 jt->get_thread_stat()->perf_timers_addr(), 1048 PerfClassTraceTime::DEFINE_CLASS); 1049 1050 if (UsePerfData) { 1051 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 1052 } 1053 1054 // Class resolution will get the class name from the .class stream if the name is null. 1055 TempNewSymbol class_name = name == nullptr ? nullptr : 1056 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1057 CHECK_NULL); 1058 1059 ResourceMark rm(THREAD); 1060 ClassFileStream st((u1*)buf, len, source); 1061 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 1062 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1063 ClassLoadInfo cl_info(protection_domain); 1064 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 1065 class_loader, 1066 cl_info, 1067 CHECK_NULL); 1068 1069 if (log_is_enabled(Debug, class, resolve)) { 1070 trace_class_resolution(k); 1071 } 1072 1073 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1074 } 1075 1076 enum { 1077 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 1078 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 1079 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 1080 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 1081 }; 1082 1083 /* 1084 * Define a class with the specified flags that indicates if it's a nestmate, 1085 * hidden, or strongly referenced from class loader. 1086 */ 1087 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 1088 const jbyte *buf, jsize len, jobject pd, 1089 jboolean init, int flags, jobject classData, TRAPS) { 1090 ResourceMark rm(THREAD); 1091 1092 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup)); 1093 // Lookup class must not be a primitive class (whose mirror has a null Klass*) 1094 if (lookup_k == nullptr) { 1095 // The error message is wrong. We come here only if lookup is a primitive class 1096 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1097 } 1098 1099 Handle class_loader (THREAD, lookup_k->class_loader()); 1100 1101 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 1102 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1103 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1104 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1105 1106 InstanceKlass* host_class = nullptr; 1107 if (is_nestmate) { 1108 host_class = lookup_k->nest_host(CHECK_NULL); 1109 } 1110 1111 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1112 name, 1113 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1114 is_nestmate ? host_class->external_name() : "", 1115 is_hidden ? "hidden" : "not hidden", 1116 is_strong ? "strong" : "weak", 1117 vm_annotations ? "with vm annotations" : "without vm annotation"); 1118 1119 if (!is_hidden) { 1120 // classData is only applicable for hidden classes 1121 if (classData != nullptr) { 1122 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1123 } 1124 if (is_nestmate) { 1125 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1126 } 1127 if (!is_strong) { 1128 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1129 } 1130 if (vm_annotations) { 1131 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1132 } 1133 if (flags != STRONG_LOADER_LINK) { 1134 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1135 err_msg("invalid flag 0x%x", flags)); 1136 } 1137 } 1138 1139 // Class resolution will get the class name from the .class stream if the name is null. 1140 TempNewSymbol class_name = name == nullptr ? nullptr : 1141 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1142 CHECK_NULL); 1143 1144 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1145 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1146 ClassFileStream st((u1*)buf, len, source); 1147 1148 InstanceKlass* ik = nullptr; 1149 if (!is_hidden) { 1150 ClassLoadInfo cl_info(protection_domain); 1151 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1152 class_loader, 1153 cl_info, 1154 CHECK_NULL); 1155 1156 if (log_is_enabled(Debug, class, resolve)) { 1157 trace_class_resolution(ik); 1158 } 1159 } else { // hidden 1160 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1161 ClassLoadInfo cl_info(protection_domain, 1162 host_class, 1163 classData_h, 1164 is_hidden, 1165 is_strong, 1166 vm_annotations); 1167 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1168 class_loader, 1169 cl_info, 1170 CHECK_NULL); 1171 1172 // The hidden class loader data has been artificially been kept alive to 1173 // this point. The mirror and any instances of this class have to keep 1174 // it alive afterwards. 1175 ik->class_loader_data()->dec_keep_alive_ref_count(); 1176 1177 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1178 ModuleEntry* module = ik->module(); 1179 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1180 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1181 module_name, 1182 ik->external_name(), 1183 host_class->external_name(), 1184 ik->is_hidden() ? "is hidden" : "is not hidden"); 1185 } 1186 } 1187 1188 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) { 1189 // non-hidden class or nestmate class must be in the same package as the Lookup class 1190 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages"); 1191 } 1192 1193 if (init) { 1194 ik->initialize(CHECK_NULL); 1195 } else { 1196 ik->link_class(CHECK_NULL); 1197 } 1198 1199 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1200 } 1201 1202 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1203 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1204 JVM_END 1205 1206 /* 1207 * Define a class with the specified lookup class. 1208 * lookup: Lookup class 1209 * name: the name of the class 1210 * buf: class bytes 1211 * len: length of class bytes 1212 * pd: protection domain 1213 * init: initialize the class 1214 * flags: properties of the class 1215 * classData: private static pre-initialized field 1216 */ 1217 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1218 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1219 1220 if (lookup == nullptr) { 1221 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1222 } 1223 1224 assert(buf != nullptr, "buf must not be null"); 1225 1226 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1227 JVM_END 1228 1229 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1230 1231 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1232 JVM_END 1233 1234 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1235 ResourceMark rm(THREAD); 1236 1237 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1238 char* str = java_lang_String::as_utf8_string(h_name()); 1239 1240 // Sanity check, don't expect null 1241 if (str == nullptr) return nullptr; 1242 1243 // Internalize the string, converting '.' to '/' in string. 1244 char* p = (char*)str; 1245 while (*p != '\0') { 1246 if (*p == '.') { 1247 *p = '/'; 1248 } 1249 p++; 1250 } 1251 1252 const int str_len = (int)(p - str); 1253 if (str_len > Symbol::max_length()) { 1254 // It's impossible to create this class; the name cannot fit 1255 // into the constant pool. 1256 return nullptr; 1257 } 1258 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1259 1260 // Security Note: 1261 // The Java level wrapper will perform the necessary security check allowing 1262 // us to pass the null as the initiating class loader. 1263 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1264 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader); 1265 #if INCLUDE_CDS 1266 if (k == nullptr) { 1267 // If the class is not already loaded, try to see if it's in the shared 1268 // archive for the current classloader (h_loader). 1269 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1270 } 1271 #endif 1272 return (k == nullptr) ? nullptr : 1273 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1274 JVM_END 1275 1276 // Module support ////////////////////////////////////////////////////////////////////////////// 1277 1278 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1279 jstring location, jobjectArray packages)) 1280 Handle h_module (THREAD, JNIHandles::resolve(module)); 1281 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1282 JVM_END 1283 1284 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1285 Handle h_module (THREAD, JNIHandles::resolve(module)); 1286 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1287 JVM_END 1288 1289 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1290 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1291 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1292 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1293 JVM_END 1294 1295 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1296 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1297 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1298 JVM_END 1299 1300 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1301 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1302 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1303 JVM_END 1304 1305 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1306 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1307 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1308 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1309 JVM_END 1310 1311 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1312 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1313 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1314 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1315 JVM_END 1316 1317 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1318 1319 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1320 assert (cls != nullptr, "illegal class"); 1321 JvmtiVMObjectAllocEventCollector oam; 1322 ResourceMark rm(THREAD); 1323 HandleMark hm(THREAD); 1324 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1325 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1326 return (jstring) JNIHandles::make_local(THREAD, result); 1327 JVM_END 1328 1329 1330 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1331 JvmtiVMObjectAllocEventCollector oam; 1332 oop mirror = JNIHandles::resolve_non_null(cls); 1333 1334 // Special handling for primitive objects 1335 if (java_lang_Class::is_primitive(mirror)) { 1336 // Primitive objects does not have any interfaces 1337 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1338 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1339 } 1340 1341 Klass* klass = java_lang_Class::as_Klass(mirror); 1342 // Figure size of result array 1343 int size; 1344 if (klass->is_instance_klass()) { 1345 InstanceKlass* ik = InstanceKlass::cast(klass); 1346 size = ik->local_interfaces()->length(); 1347 } else { 1348 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1349 size = 2; 1350 } 1351 1352 // Allocate result array 1353 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1354 objArrayHandle result (THREAD, r); 1355 // Fill in result 1356 if (klass->is_instance_klass()) { 1357 // Regular instance klass, fill in all local interfaces 1358 for (int index = 0; index < size; index++) { 1359 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1360 result->obj_at_put(index, k->java_mirror()); 1361 } 1362 } else { 1363 // All arrays implement java.lang.Cloneable and java.io.Serializable 1364 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1365 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1366 } 1367 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1368 JVM_END 1369 1370 1371 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1372 oop mirror = JNIHandles::resolve_non_null(cls); 1373 if (java_lang_Class::is_primitive(mirror)) { 1374 return JNI_FALSE; 1375 } 1376 Klass* k = java_lang_Class::as_Klass(mirror); 1377 return k->is_hidden(); 1378 JVM_END 1379 1380 class ScopedValueBindingsResolver { 1381 public: 1382 InstanceKlass* Carrier_klass; 1383 ScopedValueBindingsResolver(JavaThread* THREAD) { 1384 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD); 1385 Carrier_klass = InstanceKlass::cast(k); 1386 } 1387 }; 1388 1389 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1390 ResourceMark rm(THREAD); 1391 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1392 JvmtiVMObjectAllocEventCollector oam; 1393 1394 static ScopedValueBindingsResolver resolver(THREAD); 1395 1396 // Iterate through Java frames 1397 vframeStream vfst(thread); 1398 for(; !vfst.at_end(); vfst.next()) { 1399 int loc = -1; 1400 // get method of frame 1401 Method* method = vfst.method(); 1402 1403 Symbol *name = method->name(); 1404 1405 InstanceKlass* holder = method->method_holder(); 1406 if (name == vmSymbols::runWith_method_name()) { 1407 if (holder == vmClasses::Thread_klass() 1408 || holder == resolver.Carrier_klass) { 1409 loc = 1; 1410 } 1411 } 1412 1413 if (loc != -1) { 1414 javaVFrame *frame = vfst.asJavaVFrame(); 1415 StackValueCollection* locals = frame->locals(); 1416 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot 1417 Handle result = head_sv->get_obj(); 1418 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1419 if (result() != nullptr) { 1420 return JNIHandles::make_local(THREAD, result()); 1421 } 1422 } 1423 } 1424 1425 return nullptr; 1426 JVM_END 1427 1428 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1429 JvmtiVMObjectAllocEventCollector oam; 1430 // ofClass is a reference to a java_lang_Class object. The mirror object 1431 // of an InstanceKlass 1432 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1433 if (java_lang_Class::is_primitive(ofMirror) || 1434 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1435 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1436 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1437 } 1438 1439 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1440 InnerClassesIterator iter(k); 1441 1442 if (iter.length() == 0) { 1443 // Neither an inner nor outer class 1444 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1445 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1446 } 1447 1448 // find inner class info 1449 constantPoolHandle cp(thread, k->constants()); 1450 int length = iter.length(); 1451 1452 // Allocate temp. result array 1453 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL); 1454 objArrayHandle result (THREAD, r); 1455 int members = 0; 1456 1457 for (; !iter.done(); iter.next()) { 1458 int ioff = iter.inner_class_info_index(); 1459 int ooff = iter.outer_class_info_index(); 1460 1461 if (ioff != 0 && ooff != 0) { 1462 // Check to see if the name matches the class we're looking for 1463 // before attempting to find the class. 1464 if (cp->klass_name_at_matches(k, ooff)) { 1465 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1466 if (outer_klass == k) { 1467 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1468 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1469 1470 // Throws an exception if outer klass has not declared k as 1471 // an inner klass 1472 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1473 1474 result->obj_at_put(members, inner_klass->java_mirror()); 1475 members++; 1476 } 1477 } 1478 } 1479 } 1480 1481 if (members != length) { 1482 // Return array of right length 1483 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL); 1484 for(int i = 0; i < members; i++) { 1485 res->obj_at_put(i, result->obj_at(i)); 1486 } 1487 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1488 } 1489 1490 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1491 JVM_END 1492 1493 1494 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1495 { 1496 // ofClass is a reference to a java_lang_Class object. 1497 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1498 if (java_lang_Class::is_primitive(ofMirror)) { 1499 return nullptr; 1500 } 1501 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1502 if (!klass->is_instance_klass()) { 1503 return nullptr; 1504 } 1505 1506 bool inner_is_member = false; 1507 Klass* outer_klass 1508 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1509 if (outer_klass == nullptr) return nullptr; // already a top-level class 1510 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1511 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1512 } 1513 JVM_END 1514 1515 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1516 { 1517 oop mirror = JNIHandles::resolve_non_null(cls); 1518 if (java_lang_Class::is_primitive(mirror)) { 1519 return nullptr; 1520 } 1521 Klass* klass = java_lang_Class::as_Klass(mirror); 1522 if (!klass->is_instance_klass()) { 1523 return nullptr; 1524 } 1525 InstanceKlass* k = InstanceKlass::cast(klass); 1526 int ooff = 0, noff = 0; 1527 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1528 if (noff != 0) { 1529 constantPoolHandle i_cp(thread, k->constants()); 1530 Symbol* name = i_cp->symbol_at(noff); 1531 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1532 return (jstring) JNIHandles::make_local(THREAD, str()); 1533 } 1534 } 1535 return nullptr; 1536 } 1537 JVM_END 1538 1539 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1540 assert (cls != nullptr, "illegal class"); 1541 JvmtiVMObjectAllocEventCollector oam; 1542 ResourceMark rm(THREAD); 1543 oop mirror = JNIHandles::resolve_non_null(cls); 1544 // Return null for arrays and primitives 1545 if (!java_lang_Class::is_primitive(mirror)) { 1546 Klass* k = java_lang_Class::as_Klass(mirror); 1547 if (k->is_instance_klass()) { 1548 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1549 if (sym == nullptr) return nullptr; 1550 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1551 return (jstring) JNIHandles::make_local(THREAD, str()); 1552 } 1553 } 1554 return nullptr; 1555 JVM_END 1556 1557 1558 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1559 assert (cls != nullptr, "illegal class"); 1560 oop mirror = JNIHandles::resolve_non_null(cls); 1561 // Return null for arrays and primitives 1562 if (!java_lang_Class::is_primitive(mirror)) { 1563 Klass* k = java_lang_Class::as_Klass(mirror); 1564 if (k->is_instance_klass()) { 1565 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1566 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1567 } 1568 } 1569 return nullptr; 1570 JVM_END 1571 1572 1573 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1574 // some of this code was adapted from from jni_FromReflectedField 1575 1576 oop reflected = JNIHandles::resolve_non_null(field); 1577 oop mirror = java_lang_reflect_Field::clazz(reflected); 1578 int slot = java_lang_reflect_Field::slot(reflected); 1579 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1580 1581 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 1582 int offset = ik->field_offset(slot); 1583 1584 if (modifiers & JVM_ACC_STATIC) { 1585 // for static fields we only look in the current class 1586 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1587 assert(false, "cannot find static field"); 1588 return false; 1589 } 1590 } else { 1591 // for instance fields we start with the current class and work 1592 // our way up through the superclass chain 1593 if (!ik->find_field_from_offset(offset, false, &fd)) { 1594 assert(false, "cannot find instance field"); 1595 return false; 1596 } 1597 } 1598 return true; 1599 } 1600 1601 static Method* jvm_get_method_common(jobject method) { 1602 // some of this code was adapted from from jni_FromReflectedMethod 1603 1604 oop reflected = JNIHandles::resolve_non_null(method); 1605 oop mirror = nullptr; 1606 int slot = 0; 1607 1608 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1609 mirror = java_lang_reflect_Constructor::clazz(reflected); 1610 slot = java_lang_reflect_Constructor::slot(reflected); 1611 } else { 1612 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1613 "wrong type"); 1614 mirror = java_lang_reflect_Method::clazz(reflected); 1615 slot = java_lang_reflect_Method::slot(reflected); 1616 } 1617 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 1618 1619 Method* m = ik->method_with_idnum(slot); 1620 assert(m != nullptr, "cannot find method"); 1621 return m; // caller has to deal with null in product mode 1622 } 1623 1624 /* Type use annotations support (JDK 1.8) */ 1625 1626 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1627 assert (cls != nullptr, "illegal class"); 1628 ResourceMark rm(THREAD); 1629 // Return null for arrays and primitives 1630 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1631 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1632 if (k->is_instance_klass()) { 1633 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1634 if (type_annotations != nullptr) { 1635 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1636 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1637 } 1638 } 1639 } 1640 return nullptr; 1641 JVM_END 1642 1643 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1644 assert (method != nullptr, "illegal method"); 1645 // method is a handle to a java.lang.reflect.Method object 1646 Method* m = jvm_get_method_common(method); 1647 if (m == nullptr) { 1648 return nullptr; 1649 } 1650 1651 AnnotationArray* type_annotations = m->type_annotations(); 1652 if (type_annotations != nullptr) { 1653 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1654 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1655 } 1656 1657 return nullptr; 1658 JVM_END 1659 1660 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1661 assert (field != nullptr, "illegal field"); 1662 fieldDescriptor fd; 1663 bool gotFd = jvm_get_field_common(field, fd); 1664 if (!gotFd) { 1665 return nullptr; 1666 } 1667 1668 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1669 JVM_END 1670 1671 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1672 if (!cp->is_within_bounds(index)) { 1673 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1674 } 1675 } 1676 1677 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1678 { 1679 // method is a handle to a java.lang.reflect.Method object 1680 Method* method_ptr = jvm_get_method_common(method); 1681 methodHandle mh (THREAD, method_ptr); 1682 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1683 const int num_params = mh->method_parameters_length(); 1684 1685 if (num_params < 0) { 1686 // A -1 return value from method_parameters_length means there is no 1687 // parameter data. Return null to indicate this to the reflection 1688 // API. 1689 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1690 return (jobjectArray)nullptr; 1691 } else { 1692 // Otherwise, we return something up to reflection, even if it is 1693 // a zero-length array. Why? Because in some cases this can 1694 // trigger a MalformedParametersException. 1695 1696 // make sure all the symbols are properly formatted 1697 for (int i = 0; i < num_params; i++) { 1698 MethodParametersElement* params = mh->method_parameters_start(); 1699 int index = params[i].name_cp_index; 1700 constantPoolHandle cp(THREAD, mh->constants()); 1701 bounds_check(cp, index, CHECK_NULL); 1702 1703 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1704 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1705 "Wrong type at constant pool index"); 1706 } 1707 1708 } 1709 1710 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1711 objArrayHandle result (THREAD, result_oop); 1712 1713 for (int i = 0; i < num_params; i++) { 1714 MethodParametersElement* params = mh->method_parameters_start(); 1715 // For a 0 index, give a null symbol 1716 Symbol* sym = 0 != params[i].name_cp_index ? 1717 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1718 int flags = params[i].flags; 1719 oop param = Reflection::new_parameter(reflected_method, i, sym, 1720 flags, CHECK_NULL); 1721 result->obj_at_put(i, param); 1722 } 1723 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1724 } 1725 } 1726 JVM_END 1727 1728 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1729 1730 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1731 { 1732 JvmtiVMObjectAllocEventCollector oam; 1733 1734 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1735 // Exclude primitive types and array types 1736 if (java_lang_Class::is_primitive(ofMirror) || 1737 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1738 // Return empty array 1739 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1740 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1741 } 1742 1743 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1744 constantPoolHandle cp(THREAD, k->constants()); 1745 1746 // Ensure class is linked 1747 k->link_class(CHECK_NULL); 1748 1749 // Allocate result 1750 int num_fields; 1751 1752 if (publicOnly) { 1753 num_fields = 0; 1754 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1755 if (fs.access_flags().is_public()) ++num_fields; 1756 } 1757 } else { 1758 num_fields = k->java_fields_count(); 1759 } 1760 1761 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1762 objArrayHandle result (THREAD, r); 1763 1764 int out_idx = 0; 1765 fieldDescriptor fd; 1766 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1767 if (!publicOnly || fs.access_flags().is_public()) { 1768 fd.reinitialize(k, fs.to_FieldInfo()); 1769 oop field = Reflection::new_field(&fd, CHECK_NULL); 1770 result->obj_at_put(out_idx, field); 1771 ++out_idx; 1772 } 1773 } 1774 assert(out_idx == num_fields, "just checking"); 1775 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1776 } 1777 JVM_END 1778 1779 // A class is a record if and only if it is final and a direct subclass of 1780 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1781 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1782 { 1783 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1784 if (k != nullptr && k->is_instance_klass()) { 1785 InstanceKlass* ik = InstanceKlass::cast(k); 1786 return ik->is_record(); 1787 } else { 1788 return false; 1789 } 1790 } 1791 JVM_END 1792 1793 // Returns an array containing the components of the Record attribute, 1794 // or null if the attribute is not present. 1795 // 1796 // Note that this function returns the components of the Record attribute 1797 // even if the class is not a record. 1798 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1799 { 1800 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass)); 1801 1802 Array<RecordComponent*>* components = ik->record_components(); 1803 if (components != nullptr) { 1804 JvmtiVMObjectAllocEventCollector oam; 1805 constantPoolHandle cp(THREAD, ik->constants()); 1806 int length = components->length(); 1807 assert(length >= 0, "unexpected record_components length"); 1808 objArrayOop record_components = 1809 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1810 objArrayHandle components_h (THREAD, record_components); 1811 1812 for (int x = 0; x < length; x++) { 1813 RecordComponent* component = components->at(x); 1814 assert(component != nullptr, "unexpected null record component"); 1815 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1816 components_h->obj_at_put(x, component_oop); 1817 } 1818 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1819 } 1820 1821 return nullptr; 1822 } 1823 JVM_END 1824 1825 static jobjectArray get_class_declared_methods_helper( 1826 JNIEnv *env, 1827 jclass ofClass, jboolean publicOnly, 1828 bool want_constructor, 1829 Klass* klass, TRAPS) { 1830 1831 JvmtiVMObjectAllocEventCollector oam; 1832 1833 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1834 // Exclude primitive types and array types 1835 if (java_lang_Class::is_primitive(ofMirror) 1836 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1837 // Return empty array 1838 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1839 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1840 } 1841 1842 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1843 1844 // Ensure class is linked 1845 k->link_class(CHECK_NULL); 1846 1847 Array<Method*>* methods = k->methods(); 1848 int methods_length = methods->length(); 1849 1850 // Save original method_idnum in case of redefinition, which can change 1851 // the idnum of obsolete methods. The new method will have the same idnum 1852 // but if we refresh the methods array, the counts will be wrong. 1853 ResourceMark rm(THREAD); 1854 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1855 int num_methods = 0; 1856 1857 // Select methods matching the criteria. 1858 for (int i = 0; i < methods_length; i++) { 1859 Method* method = methods->at(i); 1860 if (want_constructor && !method->is_object_constructor()) { 1861 continue; 1862 } 1863 if (!want_constructor && 1864 (method->is_object_constructor() || method->is_class_initializer() || 1865 method->is_overpass())) { 1866 continue; 1867 } 1868 if (publicOnly && !method->is_public()) { 1869 continue; 1870 } 1871 idnums->push(method->method_idnum()); 1872 ++num_methods; 1873 } 1874 1875 // Allocate result 1876 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1877 objArrayHandle result (THREAD, r); 1878 1879 // Now just put the methods that we selected above, but go by their idnum 1880 // in case of redefinition. The methods can be redefined at any safepoint, 1881 // so above when allocating the oop array and below when creating reflect 1882 // objects. 1883 for (int i = 0; i < num_methods; i++) { 1884 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1885 if (method.is_null()) { 1886 // Method may have been deleted and seems this API can handle null 1887 // Otherwise should probably put a method that throws NSME 1888 result->obj_at_put(i, nullptr); 1889 } else { 1890 oop m; 1891 if (want_constructor) { 1892 assert(method->is_object_constructor(), "must be"); 1893 m = Reflection::new_constructor(method, CHECK_NULL); 1894 } else { 1895 m = Reflection::new_method(method, false, CHECK_NULL); 1896 } 1897 result->obj_at_put(i, m); 1898 } 1899 } 1900 1901 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1902 } 1903 1904 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1905 { 1906 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1907 /*want_constructor*/ false, 1908 vmClasses::reflect_Method_klass(), THREAD); 1909 } 1910 JVM_END 1911 1912 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1913 { 1914 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1915 /*want_constructor*/ true, 1916 vmClasses::reflect_Constructor_klass(), THREAD); 1917 } 1918 JVM_END 1919 1920 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1921 { 1922 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1923 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member)); 1924 return c->has_nestmate_access_to(m, THREAD); 1925 } 1926 JVM_END 1927 1928 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1929 { 1930 // current is not a primitive or array class 1931 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1932 InstanceKlass* host = c->nest_host(THREAD); 1933 return (jclass) (host == nullptr ? nullptr : 1934 JNIHandles::make_local(THREAD, host->java_mirror())); 1935 } 1936 JVM_END 1937 1938 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1939 { 1940 // current is not a primitive or array class 1941 ResourceMark rm(THREAD); 1942 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1943 InstanceKlass* host = c->nest_host(THREAD); 1944 1945 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 1946 c->external_name(), host->external_name()); 1947 { 1948 JvmtiVMObjectAllocEventCollector oam; 1949 Array<u2>* members = host->nest_members(); 1950 int length = members == nullptr ? 0 : members->length(); 1951 1952 log_trace(class, nestmates)(" - host has %d listed nest members", length); 1953 1954 // nest host is first in the array so make it one bigger 1955 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 1956 length + 1, CHECK_NULL); 1957 objArrayHandle result(THREAD, r); 1958 result->obj_at_put(0, host->java_mirror()); 1959 if (length != 0) { 1960 int count = 0; 1961 for (int i = 0; i < length; i++) { 1962 int cp_index = members->at(i); 1963 Klass* k = host->constants()->klass_at(cp_index, THREAD); 1964 if (HAS_PENDING_EXCEPTION) { 1965 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 1966 return nullptr; // propagate VMEs 1967 } 1968 if (log_is_enabled(Trace, class, nestmates)) { 1969 stringStream ss; 1970 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 1971 ss.print(" - resolution of nest member %s failed: ", target_member_class); 1972 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 1973 log_trace(class, nestmates)("%s", ss.as_string()); 1974 } 1975 CLEAR_PENDING_EXCEPTION; 1976 continue; 1977 } 1978 if (k->is_instance_klass()) { 1979 InstanceKlass* ik = InstanceKlass::cast(k); 1980 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 1981 if (nest_host_k == host) { 1982 result->obj_at_put(count+1, k->java_mirror()); 1983 count++; 1984 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 1985 } else { 1986 log_trace(class, nestmates)(" - skipping member %s with different host %s", 1987 ik->external_name(), nest_host_k->external_name()); 1988 } 1989 } else { 1990 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 1991 k->external_name()); 1992 } 1993 } 1994 if (count < length) { 1995 // we had invalid entries so we need to compact the array 1996 log_trace(class, nestmates)(" - compacting array from length %d to %d", 1997 length + 1, count + 1); 1998 1999 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2000 count + 1, CHECK_NULL); 2001 objArrayHandle result2(THREAD, r2); 2002 for (int i = 0; i < count + 1; i++) { 2003 result2->obj_at_put(i, result->obj_at(i)); 2004 } 2005 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2006 } 2007 } 2008 else { 2009 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate"); 2010 } 2011 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2012 } 2013 } 2014 JVM_END 2015 2016 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2017 { 2018 oop mirror = JNIHandles::resolve_non_null(current); 2019 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2020 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 2021 2022 ResourceMark rm(THREAD); 2023 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2024 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2025 if (ik->is_sealed()) { 2026 JvmtiVMObjectAllocEventCollector oam; 2027 Array<u2>* subclasses = ik->permitted_subclasses(); 2028 int length = subclasses->length(); 2029 2030 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2031 2032 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2033 length, CHECK_NULL); 2034 objArrayHandle result(THREAD, r); 2035 int count = 0; 2036 for (int i = 0; i < length; i++) { 2037 int cp_index = subclasses->at(i); 2038 Klass* k = ik->constants()->klass_at(cp_index, THREAD); 2039 if (HAS_PENDING_EXCEPTION) { 2040 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2041 return nullptr; // propagate VMEs 2042 } 2043 if (log_is_enabled(Trace, class, sealed)) { 2044 stringStream ss; 2045 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2046 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2047 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2048 log_trace(class, sealed)("%s", ss.as_string()); 2049 } 2050 2051 CLEAR_PENDING_EXCEPTION; 2052 continue; 2053 } 2054 if (k->is_instance_klass()) { 2055 result->obj_at_put(count++, k->java_mirror()); 2056 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2057 } 2058 } 2059 if (count < length) { 2060 // we had invalid entries so we need to compact the array 2061 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2062 count, CHECK_NULL); 2063 objArrayHandle result2(THREAD, r2); 2064 for (int i = 0; i < count; i++) { 2065 result2->obj_at_put(i, result->obj_at(i)); 2066 } 2067 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2068 } 2069 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2070 } else { 2071 return nullptr; 2072 } 2073 } 2074 JVM_END 2075 2076 // Constant pool access ////////////////////////////////////////////////////////// 2077 2078 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2079 { 2080 JvmtiVMObjectAllocEventCollector oam; 2081 oop mirror = JNIHandles::resolve_non_null(cls); 2082 // Return null for primitives and arrays 2083 if (!java_lang_Class::is_primitive(mirror)) { 2084 Klass* k = java_lang_Class::as_Klass(mirror); 2085 if (k->is_instance_klass()) { 2086 InstanceKlass* k_h = InstanceKlass::cast(k); 2087 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2088 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2089 return JNIHandles::make_local(THREAD, jcp()); 2090 } 2091 } 2092 return nullptr; 2093 } 2094 JVM_END 2095 2096 2097 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj)) 2098 { 2099 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2100 return cp->length(); 2101 } 2102 JVM_END 2103 2104 2105 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index)) 2106 { 2107 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2108 bounds_check(cp, index, CHECK_NULL); 2109 constantTag tag = cp->tag_at(index); 2110 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2111 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2112 } 2113 Klass* k = cp->klass_at(index, CHECK_NULL); 2114 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2115 } 2116 JVM_END 2117 2118 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2119 { 2120 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2121 bounds_check(cp, index, CHECK_NULL); 2122 constantTag tag = cp->tag_at(index); 2123 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2124 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2125 } 2126 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2127 if (k == nullptr) return nullptr; 2128 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2129 } 2130 JVM_END 2131 2132 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2133 constantTag tag = cp->tag_at(index); 2134 if (!tag.is_method() && !tag.is_interface_method()) { 2135 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2136 } 2137 int klass_ref = cp->uncached_klass_ref_index_at(index); 2138 Klass* k_o; 2139 if (force_resolution) { 2140 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2141 } else { 2142 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2143 if (k_o == nullptr) return nullptr; 2144 } 2145 InstanceKlass* k = InstanceKlass::cast(k_o); 2146 Symbol* name = cp->uncached_name_ref_at(index); 2147 Symbol* sig = cp->uncached_signature_ref_at(index); 2148 methodHandle m (THREAD, k->find_method(name, sig)); 2149 if (m.is_null()) { 2150 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2151 } 2152 oop method; 2153 if (m->is_object_constructor()) { 2154 method = Reflection::new_constructor(m, CHECK_NULL); 2155 } else { 2156 method = Reflection::new_method(m, true, CHECK_NULL); 2157 } 2158 return JNIHandles::make_local(THREAD, method); 2159 } 2160 2161 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index)) 2162 { 2163 JvmtiVMObjectAllocEventCollector oam; 2164 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2165 bounds_check(cp, index, CHECK_NULL); 2166 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2167 return res; 2168 } 2169 JVM_END 2170 2171 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2172 { 2173 JvmtiVMObjectAllocEventCollector oam; 2174 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2175 bounds_check(cp, index, CHECK_NULL); 2176 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2177 return res; 2178 } 2179 JVM_END 2180 2181 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2182 constantTag tag = cp->tag_at(index); 2183 if (!tag.is_field()) { 2184 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2185 } 2186 int klass_ref = cp->uncached_klass_ref_index_at(index); 2187 Klass* k_o; 2188 if (force_resolution) { 2189 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2190 } else { 2191 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2192 if (k_o == nullptr) return nullptr; 2193 } 2194 InstanceKlass* k = InstanceKlass::cast(k_o); 2195 Symbol* name = cp->uncached_name_ref_at(index); 2196 Symbol* sig = cp->uncached_signature_ref_at(index); 2197 fieldDescriptor fd; 2198 Klass* target_klass = k->find_field(name, sig, &fd); 2199 if (target_klass == nullptr) { 2200 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2201 } 2202 oop field = Reflection::new_field(&fd, CHECK_NULL); 2203 return JNIHandles::make_local(THREAD, field); 2204 } 2205 2206 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index)) 2207 { 2208 JvmtiVMObjectAllocEventCollector oam; 2209 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2210 bounds_check(cp, index, CHECK_NULL); 2211 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2212 return res; 2213 } 2214 JVM_END 2215 2216 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2217 { 2218 JvmtiVMObjectAllocEventCollector oam; 2219 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2220 bounds_check(cp, index, CHECK_NULL); 2221 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2222 return res; 2223 } 2224 JVM_END 2225 2226 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index)) 2227 { 2228 JvmtiVMObjectAllocEventCollector oam; 2229 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2230 bounds_check(cp, index, CHECK_NULL); 2231 constantTag tag = cp->tag_at(index); 2232 if (!tag.is_field_or_method()) { 2233 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2234 } 2235 int klass_ref = cp->uncached_klass_ref_index_at(index); 2236 Symbol* klass_name = cp->klass_name_at(klass_ref); 2237 Symbol* member_name = cp->uncached_name_ref_at(index); 2238 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2239 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2240 objArrayHandle dest(THREAD, dest_o); 2241 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2242 dest->obj_at_put(0, str()); 2243 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2244 dest->obj_at_put(1, str()); 2245 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2246 dest->obj_at_put(2, str()); 2247 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2248 } 2249 JVM_END 2250 2251 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index)) 2252 { 2253 JvmtiVMObjectAllocEventCollector oam; 2254 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2255 bounds_check(cp, index, CHECK_0); 2256 constantTag tag = cp->tag_at(index); 2257 if (!tag.is_field_or_method()) { 2258 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2259 } 2260 return (jint) cp->uncached_klass_ref_index_at(index); 2261 } 2262 JVM_END 2263 2264 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index)) 2265 { 2266 JvmtiVMObjectAllocEventCollector oam; 2267 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2268 bounds_check(cp, index, CHECK_0); 2269 constantTag tag = cp->tag_at(index); 2270 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2271 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2272 } 2273 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2274 } 2275 JVM_END 2276 2277 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index)) 2278 { 2279 JvmtiVMObjectAllocEventCollector oam; 2280 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2281 bounds_check(cp, index, CHECK_NULL); 2282 constantTag tag = cp->tag_at(index); 2283 if (!tag.is_name_and_type()) { 2284 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2285 } 2286 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2287 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2288 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2289 objArrayHandle dest(THREAD, dest_o); 2290 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2291 dest->obj_at_put(0, str()); 2292 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2293 dest->obj_at_put(1, str()); 2294 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2295 } 2296 JVM_END 2297 2298 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index)) 2299 { 2300 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2301 bounds_check(cp, index, CHECK_0); 2302 constantTag tag = cp->tag_at(index); 2303 if (!tag.is_int()) { 2304 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2305 } 2306 return cp->int_at(index); 2307 } 2308 JVM_END 2309 2310 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index)) 2311 { 2312 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2313 bounds_check(cp, index, CHECK_(0L)); 2314 constantTag tag = cp->tag_at(index); 2315 if (!tag.is_long()) { 2316 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2317 } 2318 return cp->long_at(index); 2319 } 2320 JVM_END 2321 2322 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index)) 2323 { 2324 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2325 bounds_check(cp, index, CHECK_(0.0f)); 2326 constantTag tag = cp->tag_at(index); 2327 if (!tag.is_float()) { 2328 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2329 } 2330 return cp->float_at(index); 2331 } 2332 JVM_END 2333 2334 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index)) 2335 { 2336 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2337 bounds_check(cp, index, CHECK_(0.0)); 2338 constantTag tag = cp->tag_at(index); 2339 if (!tag.is_double()) { 2340 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2341 } 2342 return cp->double_at(index); 2343 } 2344 JVM_END 2345 2346 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index)) 2347 { 2348 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2349 bounds_check(cp, index, CHECK_NULL); 2350 constantTag tag = cp->tag_at(index); 2351 if (!tag.is_string()) { 2352 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2353 } 2354 oop str = cp->string_at(index, CHECK_NULL); 2355 return (jstring) JNIHandles::make_local(THREAD, str); 2356 } 2357 JVM_END 2358 2359 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index)) 2360 { 2361 JvmtiVMObjectAllocEventCollector oam; 2362 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2363 bounds_check(cp, index, CHECK_NULL); 2364 constantTag tag = cp->tag_at(index); 2365 if (!tag.is_symbol()) { 2366 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2367 } 2368 Symbol* sym = cp->symbol_at(index); 2369 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2370 return (jstring) JNIHandles::make_local(THREAD, str()); 2371 } 2372 JVM_END 2373 2374 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index)) 2375 { 2376 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2377 bounds_check(cp, index, CHECK_0); 2378 constantTag tag = cp->tag_at(index); 2379 jbyte result = tag.value(); 2380 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2381 // they are changed to the corresponding tags from the JVM spec, so that java code in 2382 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2383 if (tag.is_klass_or_reference()) { 2384 result = JVM_CONSTANT_Class; 2385 } else if (tag.is_string_index()) { 2386 result = JVM_CONSTANT_String; 2387 } else if (tag.is_method_type_in_error()) { 2388 result = JVM_CONSTANT_MethodType; 2389 } else if (tag.is_method_handle_in_error()) { 2390 result = JVM_CONSTANT_MethodHandle; 2391 } else if (tag.is_dynamic_constant_in_error()) { 2392 result = JVM_CONSTANT_Dynamic; 2393 } 2394 return result; 2395 } 2396 JVM_END 2397 2398 // Assertion support. ////////////////////////////////////////////////////////// 2399 2400 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2401 assert(cls != nullptr, "bad class"); 2402 2403 oop r = JNIHandles::resolve(cls); 2404 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2405 if (java_lang_Class::is_primitive(r)) return false; 2406 2407 Klass* k = java_lang_Class::as_Klass(r); 2408 assert(k->is_instance_klass(), "must be an instance klass"); 2409 if (!k->is_instance_klass()) return false; 2410 2411 ResourceMark rm(THREAD); 2412 const char* name = k->name()->as_C_string(); 2413 bool system_class = k->class_loader() == nullptr; 2414 return JavaAssertions::enabled(name, system_class); 2415 2416 JVM_END 2417 2418 2419 // Return a new AssertionStatusDirectives object with the fields filled in with 2420 // command-line assertion arguments (i.e., -ea, -da). 2421 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2422 JvmtiVMObjectAllocEventCollector oam; 2423 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2424 return JNIHandles::make_local(THREAD, asd); 2425 JVM_END 2426 2427 // Verification //////////////////////////////////////////////////////////////////////////////// 2428 2429 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2430 2431 // RedefineClasses support: bug 6214132 caused verification to fail. 2432 // All functions from this section should call the jvmtiThreadSate function: 2433 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2434 // The function returns a Klass* of the _scratch_class if the verifier 2435 // was invoked in the middle of the class redefinition. 2436 // Otherwise it returns its argument value which is the _the_class Klass*. 2437 // Please, refer to the description in the jvmtiThreadState.hpp. 2438 2439 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 2440 oop mirror = JNIHandles::resolve_non_null(cls); 2441 if (java_lang_Class::is_primitive(mirror)) { 2442 return JNI_FALSE; 2443 } 2444 Klass* k = java_lang_Class::as_Klass(mirror); 2445 // This isn't necessary since answer is the same since redefinition 2446 // has already checked this matches for the scratch class. 2447 // k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2448 jboolean result = k->is_interface(); 2449 assert(!result || k->is_instance_klass(), 2450 "all interfaces are instance types"); 2451 return result; 2452 JVM_END 2453 2454 2455 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2456 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2457 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2458 return k->name()->as_utf8(); 2459 JVM_END 2460 2461 2462 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2463 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2464 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2465 // types will have length zero if this is not an InstanceKlass 2466 // (length is determined by call to JVM_GetClassCPEntriesCount) 2467 if (k->is_instance_klass()) { 2468 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2469 for (int index = cp->length() - 1; index >= 0; index--) { 2470 constantTag tag = cp->tag_at(index); 2471 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2472 } 2473 } 2474 JVM_END 2475 2476 2477 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2478 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2479 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2480 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2481 JVM_END 2482 2483 2484 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2485 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2486 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2487 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2488 JVM_END 2489 2490 2491 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2492 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2493 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2494 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2495 JVM_END 2496 2497 2498 // The following methods, used for the verifier, are never called with 2499 // array klasses, so a direct cast to InstanceKlass is safe. 2500 // Typically, these methods are called in a loop with bounds determined 2501 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2502 // zero for arrays. 2503 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2504 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2505 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2506 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2507 int length = method->checked_exceptions_length(); 2508 if (length > 0) { 2509 CheckedExceptionElement* table= method->checked_exceptions_start(); 2510 for (int i = 0; i < length; i++) { 2511 exceptions[i] = table[i].class_cp_index; 2512 } 2513 } 2514 JVM_END 2515 2516 2517 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2518 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2519 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2520 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2521 return method->checked_exceptions_length(); 2522 JVM_END 2523 2524 2525 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2526 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2527 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2528 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2529 memcpy(code, method->code_base(), method->code_size()); 2530 JVM_END 2531 2532 2533 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2534 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2535 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2536 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2537 return method->code_size(); 2538 JVM_END 2539 2540 2541 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2542 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2543 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2544 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2545 ExceptionTable extable(method); 2546 entry->start_pc = extable.start_pc(entry_index); 2547 entry->end_pc = extable.end_pc(entry_index); 2548 entry->handler_pc = extable.handler_pc(entry_index); 2549 entry->catchType = extable.catch_type_index(entry_index); 2550 JVM_END 2551 2552 2553 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2554 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2555 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2556 Method* method = InstanceKlass::cast(k)->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 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2563 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2564 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2565 return method->access_flags().as_method_flags(); 2566 JVM_END 2567 2568 2569 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2570 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2571 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2572 return InstanceKlass::cast(k)->field_access_flags(field_index); 2573 JVM_END 2574 2575 2576 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2577 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2578 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2579 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2580 return method->max_locals(); 2581 JVM_END 2582 2583 2584 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2585 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2586 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2587 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2588 return method->size_of_parameters(); 2589 JVM_END 2590 2591 2592 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2593 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2594 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2595 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2596 return method->verifier_max_stack(); 2597 JVM_END 2598 2599 2600 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2601 ResourceMark rm(THREAD); 2602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2603 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2604 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2605 return method->is_object_constructor(); 2606 JVM_END 2607 2608 2609 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2610 ResourceMark rm(THREAD); 2611 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2612 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2613 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2614 return method->is_overpass(); 2615 JVM_END 2616 2617 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2618 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2619 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2620 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2621 return method->name()->as_utf8(); 2622 JVM_END 2623 2624 2625 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2626 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2627 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2628 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2629 return method->signature()->as_utf8(); 2630 JVM_END 2631 2632 /** 2633 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2634 * read entries in the constant pool. Since the old verifier always 2635 * works on a copy of the code, it will not see any rewriting that 2636 * may possibly occur in the middle of verification. So it is important 2637 * that nothing it calls tries to use the cpCache instead of the raw 2638 * constant pool, so we must use cp->uncached_x methods when appropriate. 2639 */ 2640 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2641 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2642 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2643 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2644 switch (cp->tag_at(cp_index).value()) { 2645 case JVM_CONSTANT_Fieldref: 2646 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2647 default: 2648 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2649 } 2650 ShouldNotReachHere(); 2651 return nullptr; 2652 JVM_END 2653 2654 2655 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2656 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2657 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2658 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2659 switch (cp->tag_at(cp_index).value()) { 2660 case JVM_CONSTANT_InterfaceMethodref: 2661 case JVM_CONSTANT_Methodref: 2662 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2663 default: 2664 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2665 } 2666 ShouldNotReachHere(); 2667 return nullptr; 2668 JVM_END 2669 2670 2671 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2672 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2673 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2674 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2675 switch (cp->tag_at(cp_index).value()) { 2676 case JVM_CONSTANT_InterfaceMethodref: 2677 case JVM_CONSTANT_Methodref: 2678 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2679 default: 2680 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2681 } 2682 ShouldNotReachHere(); 2683 return nullptr; 2684 JVM_END 2685 2686 2687 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2688 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2689 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2690 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2691 switch (cp->tag_at(cp_index).value()) { 2692 case JVM_CONSTANT_Fieldref: 2693 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2694 default: 2695 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2696 } 2697 ShouldNotReachHere(); 2698 return nullptr; 2699 JVM_END 2700 2701 2702 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2703 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2704 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2705 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2706 Symbol* classname = cp->klass_name_at(cp_index); 2707 return classname->as_utf8(); 2708 JVM_END 2709 2710 2711 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2712 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2713 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2714 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2715 switch (cp->tag_at(cp_index).value()) { 2716 case JVM_CONSTANT_Fieldref: { 2717 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2718 Symbol* classname = cp->klass_name_at(class_index); 2719 return classname->as_utf8(); 2720 } 2721 default: 2722 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2723 } 2724 ShouldNotReachHere(); 2725 return nullptr; 2726 JVM_END 2727 2728 2729 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2730 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2731 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2732 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2733 switch (cp->tag_at(cp_index).value()) { 2734 case JVM_CONSTANT_Methodref: 2735 case JVM_CONSTANT_InterfaceMethodref: { 2736 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2737 Symbol* classname = cp->klass_name_at(class_index); 2738 return classname->as_utf8(); 2739 } 2740 default: 2741 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2742 } 2743 ShouldNotReachHere(); 2744 return nullptr; 2745 JVM_END 2746 2747 2748 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2749 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2750 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2751 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2752 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2753 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2754 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2755 switch (cp->tag_at(cp_index).value()) { 2756 case JVM_CONSTANT_Fieldref: { 2757 Symbol* name = cp->uncached_name_ref_at(cp_index); 2758 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2759 InstanceKlass* ik = InstanceKlass::cast(k_called); 2760 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2761 if (fs.name() == name && fs.signature() == signature) { 2762 return fs.access_flags().as_field_flags(); 2763 } 2764 } 2765 return -1; 2766 } 2767 default: 2768 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2769 } 2770 ShouldNotReachHere(); 2771 return 0; 2772 JVM_END 2773 2774 2775 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2776 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2777 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2778 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2779 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2780 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2781 switch (cp->tag_at(cp_index).value()) { 2782 case JVM_CONSTANT_Methodref: 2783 case JVM_CONSTANT_InterfaceMethodref: { 2784 Symbol* name = cp->uncached_name_ref_at(cp_index); 2785 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2786 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2787 int methods_count = methods->length(); 2788 for (int i = 0; i < methods_count; i++) { 2789 Method* method = methods->at(i); 2790 if (method->name() == name && method->signature() == signature) { 2791 return method->access_flags().as_method_flags(); 2792 } 2793 } 2794 return -1; 2795 } 2796 default: 2797 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2798 } 2799 ShouldNotReachHere(); 2800 return 0; 2801 JVM_END 2802 2803 2804 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2805 2806 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2807 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2808 JVM_END 2809 2810 2811 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2812 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2813 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2814 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2815 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2816 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2817 JVM_END 2818 2819 // Printing support ////////////////////////////////////////////////// 2820 extern "C" { 2821 2822 ATTRIBUTE_PRINTF(3, 0) 2823 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2824 // Reject count values that are negative signed values converted to 2825 // unsigned; see bug 4399518, 4417214 2826 if ((intptr_t)count <= 0) return -1; 2827 2828 int result = os::vsnprintf(str, count, fmt, args); 2829 if (result > 0 && (size_t)result >= count) { 2830 result = -1; 2831 } 2832 2833 return result; 2834 } 2835 2836 ATTRIBUTE_PRINTF(3, 4) 2837 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2838 va_list args; 2839 int len; 2840 va_start(args, fmt); 2841 len = jio_vsnprintf(str, count, fmt, args); 2842 va_end(args); 2843 return len; 2844 } 2845 2846 ATTRIBUTE_PRINTF(2, 3) 2847 int jio_fprintf(FILE* f, const char *fmt, ...) { 2848 int len; 2849 va_list args; 2850 va_start(args, fmt); 2851 len = jio_vfprintf(f, fmt, args); 2852 va_end(args); 2853 return len; 2854 } 2855 2856 ATTRIBUTE_PRINTF(2, 0) 2857 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2858 if (Arguments::vfprintf_hook() != nullptr) { 2859 return Arguments::vfprintf_hook()(f, fmt, args); 2860 } else { 2861 return vfprintf(f, fmt, args); 2862 } 2863 } 2864 2865 ATTRIBUTE_PRINTF(1, 2) 2866 JNIEXPORT int jio_printf(const char *fmt, ...) { 2867 int len; 2868 va_list args; 2869 va_start(args, fmt); 2870 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2871 va_end(args); 2872 return len; 2873 } 2874 2875 // HotSpot specific jio method 2876 void jio_print(const char* s, size_t len) { 2877 // Try to make this function as atomic as possible. 2878 if (Arguments::vfprintf_hook() != nullptr) { 2879 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2880 } else { 2881 // Make an unused local variable to avoid warning from gcc compiler. 2882 bool dummy = os::write(defaultStream::output_fd(), s, len); 2883 } 2884 } 2885 2886 } // Extern C 2887 2888 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2889 2890 // In most of the JVM thread support functions we need to access the 2891 // thread through a ThreadsListHandle to prevent it from exiting and 2892 // being reclaimed while we try to operate on it. The exceptions to this 2893 // rule are when operating on the current thread, or if the monitor of 2894 // the target java.lang.Thread is locked at the Java level - in both 2895 // cases the target cannot exit. 2896 2897 static void thread_entry(JavaThread* thread, TRAPS) { 2898 HandleMark hm(THREAD); 2899 Handle obj(THREAD, thread->threadObj()); 2900 JavaValue result(T_VOID); 2901 JavaCalls::call_virtual(&result, 2902 obj, 2903 vmClasses::Thread_klass(), 2904 vmSymbols::run_method_name(), 2905 vmSymbols::void_method_signature(), 2906 THREAD); 2907 } 2908 2909 2910 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2911 #if INCLUDE_CDS 2912 if (CDSConfig::allow_only_single_java_thread()) { 2913 // During java -Xshare:dump, if we allow multiple Java threads to 2914 // execute in parallel, symbols and classes may be loaded in 2915 // random orders which will make the resulting CDS archive 2916 // non-deterministic. 2917 // 2918 // Lucikly, during java -Xshare:dump, it's important to run only 2919 // the code in the main Java thread (which is NOT started here) that 2920 // creates the module graph, etc. It's safe to not start the other 2921 // threads which are launched by class static initializers 2922 // (ReferenceHandler, FinalizerThread and CleanerImpl). 2923 if (log_is_enabled(Info, aot)) { 2924 ResourceMark rm; 2925 oop t = JNIHandles::resolve_non_null(jthread); 2926 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 2927 } 2928 return; 2929 } 2930 #endif 2931 JavaThread *native_thread = nullptr; 2932 2933 // We cannot hold the Threads_lock when we throw an exception, 2934 // due to rank ordering issues. Example: we might need to grab the 2935 // Heap_lock while we construct the exception. 2936 bool throw_illegal_thread_state = false; 2937 2938 // We must release the Threads_lock before we can post a jvmti event 2939 // in Thread::start. 2940 { 2941 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock); 2942 // Ensure that the C++ Thread and OSThread structures aren't freed before 2943 // we operate. 2944 MutexLocker ml(Threads_lock); 2945 2946 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2947 // re-starting an already started thread, so we should usually find 2948 // that the JavaThread is null. However for a JNI attached thread 2949 // there is a small window between the Thread object being created 2950 // (with its JavaThread set) and the update to its threadStatus, so we 2951 // have to check for this 2952 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 2953 throw_illegal_thread_state = true; 2954 } else { 2955 jlong size = 2956 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2957 // Allocate the C++ Thread structure and create the native thread. The 2958 // stack size retrieved from java is 64-bit signed, but the constructor takes 2959 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2960 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2961 // - Avoid passing negative values which would result in really large stacks. 2962 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2963 size_t sz = size > 0 ? (size_t) size : 0; 2964 native_thread = new JavaThread(&thread_entry, sz); 2965 2966 // At this point it may be possible that no osthread was created for the 2967 // JavaThread due to lack of memory. Check for this situation and throw 2968 // an exception if necessary. Eventually we may want to change this so 2969 // that we only grab the lock if the thread was created successfully - 2970 // then we can also do this check and throw the exception in the 2971 // JavaThread constructor. 2972 if (native_thread->osthread() != nullptr) { 2973 // Note: the current thread is not being used within "prepare". 2974 native_thread->prepare(jthread); 2975 } 2976 } 2977 } 2978 2979 if (throw_illegal_thread_state) { 2980 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2981 } 2982 2983 assert(native_thread != nullptr, "Starting null thread?"); 2984 2985 if (native_thread->osthread() == nullptr) { 2986 ResourceMark rm(thread); 2987 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 2988 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 2989 // No one should hold a reference to the 'native_thread'. 2990 native_thread->smr_delete(); 2991 if (JvmtiExport::should_post_resource_exhausted()) { 2992 JvmtiExport::post_resource_exhausted( 2993 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2994 os::native_thread_creation_failed_msg()); 2995 } 2996 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2997 os::native_thread_creation_failed_msg()); 2998 } 2999 3000 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3001 3002 Thread::start(native_thread); 3003 3004 JVM_END 3005 3006 3007 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3008 ThreadsListHandle tlh(thread); 3009 oop java_thread = nullptr; 3010 JavaThread* receiver = nullptr; 3011 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3012 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3013 3014 if (is_alive) { 3015 // jthread refers to a live JavaThread. 3016 Thread::set_priority(receiver, (ThreadPriority)prio); 3017 } 3018 // Implied else: If the JavaThread hasn't started yet, then the 3019 // priority set in the java.lang.Thread object above will be pushed 3020 // down when it does start. 3021 JVM_END 3022 3023 3024 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3025 HOTSPOT_THREAD_YIELD(); 3026 os::naked_yield(); 3027 JVM_END 3028 3029 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos)) 3030 if (nanos < 0) { 3031 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range"); 3032 } 3033 3034 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3035 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3036 } 3037 3038 // Save current thread state and restore it at the end of this block. 3039 // And set new thread state to SLEEPING. 3040 JavaThreadSleepState jtss(thread); 3041 3042 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC); 3043 3044 if (nanos == 0) { 3045 os::naked_yield(); 3046 } else { 3047 ThreadState old_state = thread->osthread()->get_state(); 3048 thread->osthread()->set_state(SLEEPING); 3049 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed 3050 // An asynchronous exception could have been thrown on 3051 // us while we were sleeping. We do not overwrite those. 3052 if (!HAS_PENDING_EXCEPTION) { 3053 HOTSPOT_THREAD_SLEEP_END(1); 3054 if (!thread->has_async_exception_condition()) { 3055 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3056 // to properly restore the thread state. That's likely wrong. 3057 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3058 } 3059 } 3060 } 3061 thread->osthread()->set_state(old_state); 3062 } 3063 HOTSPOT_THREAD_SLEEP_END(0); 3064 JVM_END 3065 3066 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3067 oop jthread = thread->threadObj(); 3068 assert(jthread != nullptr, "no current carrier thread!"); 3069 return JNIHandles::make_local(THREAD, jthread); 3070 JVM_END 3071 3072 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3073 oop theThread = thread->vthread(); 3074 assert(theThread != (oop)nullptr, "no current thread!"); 3075 return JNIHandles::make_local(THREAD, theThread); 3076 JVM_END 3077 3078 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3079 jobject theThread)) 3080 oop threadObj = JNIHandles::resolve(theThread); 3081 thread->set_vthread(threadObj); 3082 3083 // Set _monitor_owner_id of new current Thread 3084 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj)); 3085 3086 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3087 JVM_END 3088 3089 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3090 return ThreadIdentifier::unsafe_offset(); 3091 JVM_END 3092 3093 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3094 ThreadsListHandle tlh(thread); 3095 JavaThread* receiver = nullptr; 3096 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3097 if (is_alive) { 3098 // jthread refers to a live JavaThread. 3099 receiver->interrupt(); 3100 } 3101 JVM_END 3102 3103 // Return true iff the current thread has locked the object passed in 3104 3105 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3106 if (obj == nullptr) { 3107 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3108 } 3109 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3110 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3111 JVM_END 3112 3113 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3114 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD); 3115 return JNIHandles::make_local(THREAD, trace); 3116 JVM_END 3117 3118 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread)) 3119 #if INCLUDE_JVMTI 3120 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD); 3121 return JNIHandles::make_local(THREAD, snapshot); 3122 #else 3123 THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException()); 3124 #endif 3125 JVM_END 3126 3127 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3128 // We don't use a ThreadsListHandle here because the current thread 3129 // must be alive. 3130 oop java_thread = JNIHandles::resolve_non_null(jthread); 3131 JavaThread* thr = java_lang_Thread::thread(java_thread); 3132 if (thread == thr && !thr->has_attached_via_jni()) { 3133 // Thread naming is only supported for the current thread and 3134 // we don't set the name of an attached thread to avoid stepping 3135 // on other programs. 3136 ResourceMark rm(thread); 3137 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3138 os::set_native_thread_name(thread_name); 3139 } 3140 JVM_END 3141 3142 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3143 oop theCache = thread->scopedValueCache(); 3144 return JNIHandles::make_local(THREAD, theCache); 3145 JVM_END 3146 3147 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3148 jobject theCache)) 3149 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3150 thread->set_scopedValueCache(objs); 3151 JVM_END 3152 3153 3154 // java.lang.Package //////////////////////////////////////////////////////////////// 3155 3156 3157 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3158 ResourceMark rm(THREAD); 3159 JvmtiVMObjectAllocEventCollector oam; 3160 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3161 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3162 return (jstring) JNIHandles::make_local(THREAD, result); 3163 JVM_END 3164 3165 3166 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3167 JvmtiVMObjectAllocEventCollector oam; 3168 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3169 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3170 JVM_END 3171 3172 3173 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3174 3175 3176 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3177 MonitorLocker ml(Heap_lock); 3178 oop ref = Universe::reference_pending_list(); 3179 if (ref != nullptr) { 3180 Universe::clear_reference_pending_list(); 3181 } 3182 return JNIHandles::make_local(THREAD, ref); 3183 JVM_END 3184 3185 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3186 MonitorLocker ml(Heap_lock); 3187 return Universe::has_reference_pending_list(); 3188 JVM_END 3189 3190 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3191 MonitorLocker ml(Heap_lock); 3192 while (!Universe::has_reference_pending_list()) { 3193 ml.wait(); 3194 } 3195 JVM_END 3196 3197 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref)) 3198 oop ref_oop = JNIHandles::resolve_non_null(ref); 3199 // PhantomReference has its own implementation of get(). 3200 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3201 oop referent = java_lang_ref_Reference::weak_referent(ref_oop); 3202 return JNIHandles::make_local(THREAD, referent); 3203 JVM_END 3204 3205 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3206 oop ref_oop = JNIHandles::resolve_non_null(ref); 3207 // PhantomReference has its own implementation of refersTo(). 3208 // See: JVM_PhantomReferenceRefersTo 3209 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3210 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3211 return referent == JNIHandles::resolve(o); 3212 JVM_END 3213 3214 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3215 oop ref_oop = JNIHandles::resolve_non_null(ref); 3216 // FinalReference has it's own implementation of clear(). 3217 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3218 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3219 // If the referent has already been cleared then done. 3220 // However, if the referent is dead but has not yet been cleared by 3221 // concurrent reference processing, it should NOT be cleared here. 3222 // Instead, clearing should be left to the GC. Clearing it here could 3223 // detectably lose an expected notification, which is impossible with 3224 // STW reference processing. The clearing in enqueue() doesn't have 3225 // this problem, since the enqueue covers the notification, but it's not 3226 // worth the effort to handle that case specially. 3227 return; 3228 } 3229 java_lang_ref_Reference::clear_referent(ref_oop); 3230 JVM_END 3231 3232 3233 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3234 3235 3236 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3237 oop ref_oop = JNIHandles::resolve_non_null(ref); 3238 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3239 return referent == JNIHandles::resolve(o); 3240 JVM_END 3241 3242 3243 // ObjectInputStream /////////////////////////////////////////////////////////////// 3244 3245 // Return the first user-defined class loader up the execution stack, or null 3246 // if only code from the bootstrap or platform class loader is on the stack. 3247 3248 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3249 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3250 InstanceKlass* ik = vfst.method()->method_holder(); 3251 oop loader = ik->class_loader(); 3252 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3253 return JNIHandles::make_local(THREAD, loader); 3254 } 3255 } 3256 return nullptr; 3257 JVM_END 3258 3259 3260 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3261 3262 3263 // resolve array handle and check arguments 3264 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3265 if (arr == nullptr) { 3266 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3267 } 3268 oop a = JNIHandles::resolve_non_null(arr); 3269 if (!a->is_array()) { 3270 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3271 } else if (type_array_only && !a->is_typeArray()) { 3272 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3273 } 3274 return arrayOop(a); 3275 } 3276 3277 3278 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3279 arrayOop a = check_array(env, arr, false, CHECK_0); 3280 return a->length(); 3281 JVM_END 3282 3283 3284 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3285 JvmtiVMObjectAllocEventCollector oam; 3286 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3287 jvalue value; 3288 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3289 oop box = Reflection::box(&value, type, CHECK_NULL); 3290 return JNIHandles::make_local(THREAD, box); 3291 JVM_END 3292 3293 3294 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3295 jvalue value; 3296 value.i = 0; // to initialize value before getting used in CHECK 3297 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3298 assert(a->is_typeArray(), "just checking"); 3299 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3300 BasicType wide_type = (BasicType) wCode; 3301 if (type != wide_type) { 3302 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3303 } 3304 return value; 3305 JVM_END 3306 3307 3308 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3309 arrayOop a = check_array(env, arr, false, CHECK); 3310 oop box = JNIHandles::resolve(val); 3311 jvalue value; 3312 value.i = 0; // to initialize value before getting used in CHECK 3313 BasicType value_type; 3314 if (a->is_objArray()) { 3315 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3316 value_type = Reflection::unbox_for_regular_object(box, &value); 3317 } else { 3318 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3319 } 3320 Reflection::array_set(&value, a, index, value_type, CHECK); 3321 JVM_END 3322 3323 3324 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3325 arrayOop a = check_array(env, arr, true, CHECK); 3326 assert(a->is_typeArray(), "just checking"); 3327 BasicType value_type = (BasicType) vCode; 3328 Reflection::array_set(&v, a, index, value_type, CHECK); 3329 JVM_END 3330 3331 3332 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3333 JvmtiVMObjectAllocEventCollector oam; 3334 oop element_mirror = JNIHandles::resolve(eltClass); 3335 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3336 return JNIHandles::make_local(THREAD, result); 3337 JVM_END 3338 3339 3340 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3341 JvmtiVMObjectAllocEventCollector oam; 3342 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3343 oop element_mirror = JNIHandles::resolve(eltClass); 3344 assert(dim_array->is_typeArray(), "just checking"); 3345 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3346 return JNIHandles::make_local(THREAD, result); 3347 JVM_END 3348 3349 3350 // Library support /////////////////////////////////////////////////////////////////////////// 3351 3352 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3353 return ZipLibrary::handle(); 3354 JVM_END 3355 3356 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3357 //%note jvm_ct 3358 char ebuf[1024]; 3359 void *load_result; 3360 { 3361 ThreadToNativeFromVM ttnfvm(thread); 3362 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3363 } 3364 if (load_result == nullptr) { 3365 if (throwException) { 3366 char msg[1024]; 3367 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3368 // Since 'ebuf' may contain a string encoded using 3369 // platform encoding scheme, we need to pass 3370 // Exceptions::unsafe_to_utf8 to the new_exception method 3371 // as the last argument. See bug 6367357. 3372 Handle h_exception = 3373 Exceptions::new_exception(thread, 3374 vmSymbols::java_lang_UnsatisfiedLinkError(), 3375 msg, Exceptions::unsafe_to_utf8); 3376 3377 THROW_HANDLE_NULL(h_exception); 3378 } else { 3379 log_info(library)("Failed to load library %s", name); 3380 return load_result; 3381 } 3382 } 3383 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3384 return load_result; 3385 JVM_END 3386 3387 3388 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3389 os::dll_unload(handle); 3390 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3391 JVM_END 3392 3393 3394 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3395 void* find_result = os::dll_lookup(handle, name); 3396 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3397 find_result != nullptr ? "Found" : "Failed to find", 3398 name, p2i(handle)); 3399 return find_result; 3400 JVM_END 3401 3402 3403 // JNI version /////////////////////////////////////////////////////////////////////////////// 3404 3405 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3406 return Threads::is_supported_jni_version_including_1_1(version); 3407 JVM_END 3408 3409 3410 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3411 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3412 JVM_END 3413 3414 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void)) 3415 return EnableValhalla ? JNI_TRUE : JNI_FALSE; 3416 JVM_END 3417 3418 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3419 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3420 JVM_END 3421 3422 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void)) 3423 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE; 3424 JVM_END 3425 3426 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void)) 3427 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE; 3428 JVM_END 3429 3430 // String support /////////////////////////////////////////////////////////////////////////// 3431 3432 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3433 JvmtiVMObjectAllocEventCollector oam; 3434 if (str == nullptr) return nullptr; 3435 oop string = JNIHandles::resolve_non_null(str); 3436 oop result = StringTable::intern(string, CHECK_NULL); 3437 return (jstring) JNIHandles::make_local(THREAD, result); 3438 JVM_END 3439 3440 3441 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3442 3443 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3444 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3445 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3446 // in the safepoint protocol, thread suspension, thread interruption, or most things of that 3447 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has 3448 // shutdown. JavaThreads will be "in native" when using this API from JDK code. 3449 3450 3451 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3452 VM_Exit::block_if_vm_exited(); 3453 return new PlatformMutex(); 3454 } 3455 3456 3457 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3458 VM_Exit::block_if_vm_exited(); 3459 delete ((PlatformMutex*) mon); 3460 } 3461 3462 3463 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3464 VM_Exit::block_if_vm_exited(); 3465 ((PlatformMutex*) mon)->lock(); 3466 return 0; 3467 } 3468 3469 3470 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3471 VM_Exit::block_if_vm_exited(); 3472 ((PlatformMutex*) mon)->unlock(); 3473 } 3474 3475 3476 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3477 3478 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3479 Handle loader, jboolean throwError, TRAPS) { 3480 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL); 3481 3482 // Check if we should initialize the class 3483 if (init && klass->is_instance_klass()) { 3484 klass->initialize(CHECK_NULL); 3485 } 3486 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3487 } 3488 3489 3490 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3491 3492 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3493 Handle method_handle; 3494 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3495 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3496 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3497 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3498 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???"); 3499 3500 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3501 jobject res = JNIHandles::make_local(THREAD, result); 3502 if (JvmtiExport::should_post_vm_object_alloc()) { 3503 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3504 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3505 if (java_lang_Class::is_primitive(ret_type)) { 3506 // Only for primitive type vm allocates memory for java object. 3507 // See box() method. 3508 JvmtiExport::post_vm_object_alloc(thread, result); 3509 } 3510 } 3511 return res; 3512 } else { 3513 THROW_NULL(vmSymbols::java_lang_StackOverflowError()); 3514 } 3515 JVM_END 3516 3517 3518 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3519 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3520 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???"); 3521 oop constructor_mirror = JNIHandles::resolve(c); 3522 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3523 jobject res = JNIHandles::make_local(THREAD, result); 3524 if (JvmtiExport::should_post_vm_object_alloc()) { 3525 JvmtiExport::post_vm_object_alloc(thread, result); 3526 } 3527 return res; 3528 JVM_END 3529 3530 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3531 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3532 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3533 JVM_END 3534 3535 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3536 jclass caller, 3537 jstring interfaceMethodName, 3538 jobject factoryType, 3539 jobject interfaceMethodType, 3540 jobject implementationMember, 3541 jobject dynamicMethodType, 3542 jclass lambdaProxyClass)) 3543 #if INCLUDE_CDS 3544 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) { 3545 return; 3546 } 3547 3548 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller)); 3549 if (caller_ik->is_hidden()) { 3550 // Hidden classes not of type lambda proxy classes are currently not being archived. 3551 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3552 // registered for archiving. 3553 return; 3554 } 3555 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass)); 3556 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3557 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3558 3559 Symbol* interface_method_name = nullptr; 3560 if (interfaceMethodName != nullptr) { 3561 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3562 } 3563 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3564 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3565 3566 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3567 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3568 3569 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3570 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3571 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3572 3573 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3574 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3575 3576 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3577 interface_method_type, m, dynamic_method_type, THREAD); 3578 #endif // INCLUDE_CDS 3579 JVM_END 3580 3581 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3582 jclass caller, 3583 jstring interfaceMethodName, 3584 jobject factoryType, 3585 jobject interfaceMethodType, 3586 jobject implementationMember, 3587 jobject dynamicMethodType)) 3588 #if INCLUDE_CDS 3589 3590 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3591 implementationMember == nullptr || dynamicMethodType == nullptr) { 3592 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3593 } 3594 3595 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller)); 3596 if (!caller_ik->in_aot_cache()) { 3597 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3598 return nullptr; 3599 } 3600 3601 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3602 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3603 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3604 3605 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3606 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3607 3608 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3609 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3610 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3611 3612 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3613 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3614 3615 InstanceKlass* loaded_lambda = 3616 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3617 interface_method_type, m, dynamic_method_type, 3618 CHECK_(nullptr)); 3619 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3620 #else 3621 return nullptr; 3622 #endif // INCLUDE_CDS 3623 JVM_END 3624 3625 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3626 if (CDSConfig::is_dumping_static_archive()) { 3627 // We do this so that the default CDS archive can be deterministic. 3628 const char* release = VM_Version::vm_release(); 3629 const char* dbg_level = VM_Version::jdk_debug_level(); 3630 const char* version = VM_Version::internal_vm_info_string(); 3631 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3632 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3633 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3634 seed += (jlong)VM_Version::vm_major_version(); 3635 seed += (jlong)VM_Version::vm_minor_version(); 3636 seed += (jlong)VM_Version::vm_security_version(); 3637 seed += (jlong)VM_Version::vm_patch_version(); 3638 if (seed == 0) { // don't let this ever be zero. 3639 seed = 0x87654321; 3640 } 3641 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3642 return seed; 3643 } else { 3644 return 0; 3645 } 3646 JVM_END 3647 3648 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus()) 3649 return CDSConfig::get_status(); 3650 JVM_END 3651 3652 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3653 #if INCLUDE_CDS 3654 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity"); 3655 if (line != nullptr) { 3656 ResourceMark rm(THREAD); 3657 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3658 char* c_line = java_lang_String::as_utf8_string(h_line()); 3659 if (CDSConfig::is_dumping_dynamic_archive()) { 3660 // Note: LambdaFormInvokers::append take same format which is not 3661 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3662 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3663 } 3664 if (ClassListWriter::is_enabled()) { 3665 ClassListWriter w; 3666 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line); 3667 } 3668 } 3669 #endif // INCLUDE_CDS 3670 JVM_END 3671 3672 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3673 #if INCLUDE_CDS 3674 ResourceMark rm(THREAD); 3675 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3676 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3677 AOTMetaspace::dump_loaded_classes(file_name, THREAD); 3678 #endif // INCLUDE_CDS 3679 JVM_END 3680 3681 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3682 #if INCLUDE_CDS 3683 ResourceMark rm(THREAD); 3684 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3685 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3686 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3687 #endif // INCLUDE_CDS 3688 JVM_END 3689 3690 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls)) 3691 #if INCLUDE_CDS 3692 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3693 if (!k->is_instance_klass()) { 3694 return false; 3695 } else { 3696 if (InstanceKlass::cast(k)->is_enum_subclass() || 3697 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) { 3698 // This class will be cached in AOT-initialized state. No need for init barriers. 3699 return false; 3700 } else { 3701 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles 3702 // must emit barriers to ensure class initialization during production run. 3703 ResourceMark rm(THREAD); 3704 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name()); 3705 return true; 3706 } 3707 } 3708 #else 3709 return false; 3710 #endif // INCLUDE_CDS 3711 JVM_END 3712 3713 // Returns an array of all live Thread objects (VM internal JavaThreads, 3714 // jvmti agent threads, and JNI attaching threads are skipped) 3715 // See CR 6404306 regarding JNI attaching threads 3716 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3717 ResourceMark rm(THREAD); 3718 ThreadsListEnumerator tle(THREAD, false, false); 3719 JvmtiVMObjectAllocEventCollector oam; 3720 3721 int num_threads = tle.num_threads(); 3722 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3723 objArrayHandle threads_ah(THREAD, r); 3724 3725 for (int i = 0; i < num_threads; i++) { 3726 Handle h = tle.get_threadObj(i); 3727 threads_ah->obj_at_put(i, h()); 3728 } 3729 3730 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3731 JVM_END 3732 3733 3734 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3735 // Return StackTraceElement[][], each element is the stack trace of a thread in 3736 // the corresponding entry in the given threads array 3737 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3738 JvmtiVMObjectAllocEventCollector oam; 3739 3740 // Check if threads is null 3741 if (threads == nullptr) { 3742 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3743 } 3744 3745 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3746 objArrayHandle ah(THREAD, a); 3747 int num_threads = ah->length(); 3748 // check if threads is non-empty array 3749 if (num_threads == 0) { 3750 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3751 } 3752 3753 // check if threads is not an array of objects of Thread class 3754 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3755 if (k != vmClasses::Thread_klass()) { 3756 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3757 } 3758 refArrayHandle rah(THREAD, (refArrayOop)ah()); // j.l.Thread is an identity class, arrays are always reference arrays 3759 3760 ResourceMark rm(THREAD); 3761 3762 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3763 for (int i = 0; i < num_threads; i++) { 3764 oop thread_obj = rah->obj_at(i); 3765 instanceHandle h(THREAD, (instanceOop) thread_obj); 3766 thread_handle_array->append(h); 3767 } 3768 3769 // The JavaThread references in thread_handle_array are validated 3770 // in VM_ThreadDump::doit(). 3771 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3772 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3773 3774 JVM_END 3775 3776 // JVM monitoring and management support 3777 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3778 return Management::get_jmm_interface(version); 3779 JVM_END 3780 3781 // com.sun.tools.attach.VirtualMachine agent properties support 3782 // 3783 // Initialize the agent properties with the properties maintained in the VM 3784 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3785 ResourceMark rm; 3786 3787 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3788 3789 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3790 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3791 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3792 return properties; 3793 JVM_END 3794 3795 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3796 { 3797 JvmtiVMObjectAllocEventCollector oam; 3798 3799 if (ofClass == nullptr) { 3800 return nullptr; 3801 } 3802 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3803 // Special handling for primitive objects 3804 if (java_lang_Class::is_primitive(mirror())) { 3805 return nullptr; 3806 } 3807 Klass* k = java_lang_Class::as_Klass(mirror()); 3808 if (!k->is_instance_klass()) { 3809 return nullptr; 3810 } 3811 InstanceKlass* ik = InstanceKlass::cast(k); 3812 int encl_method_class_idx = ik->enclosing_method_class_index(); 3813 if (encl_method_class_idx == 0) { 3814 return nullptr; 3815 } 3816 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3817 objArrayHandle dest(THREAD, dest_o); 3818 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3819 dest->obj_at_put(0, enc_k->java_mirror()); 3820 int encl_method_method_idx = ik->enclosing_method_method_index(); 3821 if (encl_method_method_idx != 0) { 3822 Symbol* sym = ik->constants()->symbol_at( 3823 extract_low_short_from_int( 3824 ik->constants()->name_and_type_at(encl_method_method_idx))); 3825 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3826 dest->obj_at_put(1, str()); 3827 sym = ik->constants()->symbol_at( 3828 extract_high_short_from_int( 3829 ik->constants()->name_and_type_at(encl_method_method_idx))); 3830 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3831 dest->obj_at_put(2, str()); 3832 } 3833 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3834 } 3835 JVM_END 3836 3837 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3838 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3839 ResourceMark rm(THREAD); 3840 3841 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3842 return nullptr; 3843 } 3844 3845 char** vm_flags = Arguments::jvm_flags_array(); 3846 char** vm_args = Arguments::jvm_args_array(); 3847 int num_flags = Arguments::num_jvm_flags(); 3848 int num_args = Arguments::num_jvm_args(); 3849 3850 InstanceKlass* ik = vmClasses::String_klass(); 3851 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3852 objArrayHandle result_h(THREAD, r); 3853 3854 int index = 0; 3855 for (int j = 0; j < num_flags; j++, index++) { 3856 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3857 result_h->obj_at_put(index, h()); 3858 } 3859 for (int i = 0; i < num_args; i++, index++) { 3860 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3861 result_h->obj_at_put(index, h()); 3862 } 3863 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 3864 JVM_END 3865 3866 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 3867 return os::get_signal_number(name); 3868 JVM_END 3869 3870 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread)) 3871 #if INCLUDE_JVMTI 3872 if (!DoJVMTIVirtualThreadTransitions) { 3873 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3874 return; 3875 } 3876 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3877 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread); 3878 } else { 3879 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3880 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false); 3881 } 3882 #endif 3883 JVM_END 3884 3885 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread)) 3886 #if INCLUDE_JVMTI 3887 if (!DoJVMTIVirtualThreadTransitions) { 3888 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3889 return; 3890 } 3891 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3892 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread); 3893 } else { 3894 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3895 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true); 3896 } 3897 #endif 3898 JVM_END 3899 3900 // If notifications are disabled then just update the VTMS transition bit and return. 3901 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call. 3902 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide)) 3903 #if INCLUDE_JVMTI 3904 if (!DoJVMTIVirtualThreadTransitions) { 3905 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3906 return; 3907 } 3908 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3909 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide); 3910 } else { 3911 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3912 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 3913 } 3914 #endif 3915 JVM_END 3916 3917 // If notifications are disabled then just update the VTMS transition bit and return. 3918 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below. 3919 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide)) 3920 #if INCLUDE_JVMTI 3921 if (!DoJVMTIVirtualThreadTransitions) { 3922 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3923 return; 3924 } 3925 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3926 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide); 3927 } else { 3928 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3929 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 3930 } 3931 #endif 3932 JVM_END 3933 3934 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section. 3935 // Needed to avoid deadlocks with JVMTI suspend mechanism. 3936 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter)) 3937 #if INCLUDE_JVMTI 3938 if (!DoJVMTIVirtualThreadTransitions) { 3939 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3940 return; 3941 } 3942 assert(thread->is_disable_suspend() != (bool)enter, 3943 "nested or unbalanced monitor enter/exit is not allowed"); 3944 thread->toggle_is_disable_suspend(); 3945 #endif 3946 JVM_END 3947 3948 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op)) 3949 #if INCLUDE_JFR 3950 freeze_result result = THREAD->last_freeze_fail_result(); 3951 assert(result != freeze_ok, "sanity check"); 3952 EventVirtualThreadPinned event(UNTIMED); 3953 event.set_starttime(THREAD->last_freeze_fail_time()); 3954 if (event.should_commit()) { 3955 ResourceMark rm(THREAD); 3956 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op)); 3957 THREAD->post_vthread_pinned_event(&event, str, result); 3958 } 3959 #endif 3960 JVM_END 3961 3962 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored)) 3963 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent(); 3964 assert(parkEvent != nullptr, "not initialized"); 3965 3966 OopHandle& list_head = ObjectMonitor::vthread_list_head(); 3967 oop vthread_head = nullptr; 3968 while (true) { 3969 if (list_head.peek() != nullptr) { 3970 for (;;) { 3971 oop head = list_head.resolve(); 3972 if (list_head.cmpxchg(head, nullptr) == head) { 3973 return JNIHandles::make_local(THREAD, head); 3974 } 3975 } 3976 } 3977 ThreadBlockInVM tbivm(THREAD); 3978 parkEvent->park(); 3979 } 3980 JVM_END 3981 /* 3982 * Return the current class's class file version. The low order 16 bits of the 3983 * returned jint contain the class's major version. The high order 16 bits 3984 * contain the class's minor version. 3985 */ 3986 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 3987 oop mirror = JNIHandles::resolve_non_null(current); 3988 if (java_lang_Class::is_primitive(mirror)) { 3989 // return latest major version and minor version of 0. 3990 return JVM_CLASSFILE_MAJOR_VERSION; 3991 } 3992 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 3993 return (ik->minor_version() << 16) | ik->major_version(); 3994 JVM_END 3995 3996 /* 3997 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 3998 * get the value will see a materialized value and not a scalar-replaced 3999 * null value. 4000 */ 4001 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 4002 JVM_EnsureMaterializedForStackWalk(env, value); 4003 JVM_END 4004 4005 /* 4006 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded. 4007 */ 4008 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void)) 4009 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE; 4010 JVM_END