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