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/cdsConfig.hpp" 27 #include "cds/classListParser.hpp" 28 #include "cds/classListWriter.hpp" 29 #include "cds/dynamicArchive.hpp" 30 #include "cds/heapShared.hpp" 31 #include "cds/lambdaFormInvokers.hpp" 32 #include "cds/lambdaProxyClassDictionary.hpp" 33 #include "classfile/classFileStream.hpp" 34 #include "classfile/classLoader.inline.hpp" 35 #include "classfile/classLoaderData.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/recordComponent.hpp" 66 #include "oops/objArrayKlass.hpp" 67 #include "oops/objArrayOop.inline.hpp" 68 #include "oops/oop.inline.hpp" 69 #include "prims/foreignGlobals.hpp" 70 #include "prims/jvm_misc.hpp" 71 #include "prims/jvmtiExport.hpp" 72 #include "prims/jvmtiThreadState.inline.hpp" 73 #include "prims/stackwalk.hpp" 74 #include "runtime/arguments.hpp" 75 #include "runtime/atomic.hpp" 76 #include "runtime/continuation.hpp" 77 #include "runtime/globals_extension.hpp" 78 #include "runtime/handles.inline.hpp" 79 #include "runtime/init.hpp" 80 #include "runtime/interfaceSupport.inline.hpp" 81 #include "runtime/deoptimization.hpp" 82 #include "runtime/handshake.hpp" 83 #include "runtime/java.hpp" 84 #include "runtime/javaCalls.hpp" 85 #include "runtime/javaThread.hpp" 86 #include "runtime/jfieldIDWorkaround.hpp" 87 #include "runtime/jniHandles.inline.hpp" 88 #include "runtime/os.inline.hpp" 89 #include "runtime/osThread.hpp" 90 #include "runtime/perfData.hpp" 91 #include "runtime/reflection.hpp" 92 #include "runtime/synchronizer.hpp" 93 #include "runtime/threadIdentifier.hpp" 94 #include "runtime/threadSMR.hpp" 95 #include "runtime/vframe.inline.hpp" 96 #include "runtime/vmOperations.hpp" 97 #include "runtime/vm_version.hpp" 98 #include "services/attachListener.hpp" 99 #include "services/management.hpp" 100 #include "services/threadService.hpp" 101 #include "utilities/checkedCast.hpp" 102 #include "utilities/copy.hpp" 103 #include "utilities/defaultStream.hpp" 104 #include "utilities/dtrace.hpp" 105 #include "utilities/events.hpp" 106 #include "utilities/macros.hpp" 107 #include "utilities/utf8.hpp" 108 #include "utilities/zipLibrary.hpp" 109 #if INCLUDE_CDS 110 #include "classfile/systemDictionaryShared.hpp" 111 #endif 112 #if INCLUDE_JFR 113 #include "jfr/jfr.hpp" 114 #endif 115 #if INCLUDE_MANAGEMENT 116 #include "services/finalizerService.hpp" 117 #endif 118 #ifdef LINUX 119 #include "osContainer_linux.hpp" 120 #endif 121 122 #include <errno.h> 123 124 /* 125 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 126 such ctors and calls MUST NOT come between an oop declaration/init and its 127 usage because if objects are move this may cause various memory stomps, bus 128 errors and segfaults. Here is a cookbook for causing so called "naked oop 129 failures": 130 131 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 132 // Object address to be held directly in mirror & not visible to GC 133 oop mirror = JNIHandles::resolve_non_null(ofClass); 134 135 // If this ctor can hit a safepoint, moving objects around, then 136 ComplexConstructor foo; 137 138 // Boom! mirror may point to JUNK instead of the intended object 139 (some dereference of mirror) 140 141 // Here's another call that may block for GC, making mirror stale 142 MutexLocker ml(some_lock); 143 144 // And here's an initializer that can result in a stale oop 145 // all in one step. 146 oop o = call_that_can_throw_exception(TRAPS); 147 148 149 The solution is to keep the oop declaration BELOW the ctor or function 150 call that might cause a GC, do another resolve to reassign the oop, or 151 consider use of a Handle instead of an oop so there is immunity from object 152 motion. But note that the "QUICK" entries below do not have a handlemark 153 and thus can only support use of handles passed in. 154 */ 155 156 extern void trace_class_resolution(Klass* to_class) { 157 ResourceMark rm; 158 int line_number = -1; 159 const char * source_file = nullptr; 160 const char * trace = "explicit"; 161 InstanceKlass* caller = nullptr; 162 JavaThread* jthread = JavaThread::current(); 163 if (jthread->has_last_Java_frame()) { 164 vframeStream vfst(jthread); 165 166 // Scan up the stack skipping ClassLoader frames. 167 Method* last_caller = nullptr; 168 169 while (!vfst.at_end()) { 170 Method* m = vfst.method(); 171 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) { 172 break; 173 } 174 last_caller = m; 175 vfst.next(); 176 } 177 // if this is called from Class.forName0 and that is called from Class.forName, 178 // then print the caller of Class.forName. If this is Class.loadClass, then print 179 // that caller, otherwise keep quiet since this should be picked up elsewhere. 180 bool found_it = false; 181 if (!vfst.at_end() && 182 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 183 vfst.method()->name() == vmSymbols::forName0_name()) { 184 vfst.next(); 185 if (!vfst.at_end() && 186 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 187 vfst.method()->name() == vmSymbols::forName_name()) { 188 vfst.next(); 189 found_it = true; 190 } 191 } else if (last_caller != nullptr && 192 last_caller->method_holder()->name() == 193 vmSymbols::java_lang_ClassLoader() && 194 last_caller->name() == vmSymbols::loadClass_name()) { 195 found_it = true; 196 } else if (!vfst.at_end()) { 197 if (vfst.method()->is_native()) { 198 // JNI call 199 found_it = true; 200 } 201 } 202 if (found_it && !vfst.at_end()) { 203 // found the caller 204 caller = vfst.method()->method_holder(); 205 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 206 if (line_number == -1) { 207 // show method name if it's a native method 208 trace = vfst.method()->name_and_sig_as_C_string(); 209 } 210 Symbol* s = caller->source_file_name(); 211 if (s != nullptr) { 212 source_file = s->as_C_string(); 213 } 214 } 215 } 216 if (caller != nullptr) { 217 if (to_class != caller) { 218 const char * from = caller->external_name(); 219 const char * to = to_class->external_name(); 220 // print in a single call to reduce interleaving between threads 221 if (source_file != nullptr) { 222 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 223 } else { 224 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 225 } 226 } 227 } 228 } 229 230 // java.lang.System ////////////////////////////////////////////////////////////////////// 231 232 233 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 234 return os::javaTimeMillis(); 235 JVM_END 236 237 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 238 return os::javaTimeNanos(); 239 JVM_END 240 241 // The function below is actually exposed by jdk.internal.misc.VM and not 242 // java.lang.System, but we choose to keep it here so that it stays next 243 // to JVM_CurrentTimeMillis and JVM_NanoTime 244 245 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 246 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 247 248 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 249 jlong seconds; 250 jlong nanos; 251 252 os::javaTimeSystemUTC(seconds, nanos); 253 254 // We're going to verify that the result can fit in a long. 255 // For that we need the difference in seconds between 'seconds' 256 // and 'offset_secs' to be such that: 257 // |seconds - offset_secs| < (2^63/10^9) 258 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 259 // which makes |seconds - offset_secs| < 2^33 260 // and we will prefer +/- 2^32 as the maximum acceptable diff 261 // as 2^32 has a more natural feel than 2^33... 262 // 263 // So if |seconds - offset_secs| >= 2^32 - we return a special 264 // sentinel value (-1) which the caller should take as an 265 // exception value indicating that the offset given to us is 266 // too far from range of the current time - leading to too big 267 // a nano adjustment. The caller is expected to recover by 268 // computing a more accurate offset and calling this method 269 // again. (For the record 2^32 secs is ~136 years, so that 270 // should rarely happen) 271 // 272 jlong diff = seconds - offset_secs; 273 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 274 return -1; // sentinel value: the offset is too far off the target 275 } 276 277 // return the adjustment. If you compute a time by adding 278 // this number of nanoseconds along with the number of seconds 279 // in the offset you should get the current UTC time. 280 return (diff * (jlong)1000000000) + nanos; 281 JVM_END 282 283 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 284 jobject dst, jint dst_pos, jint length)) 285 // Check if we have null pointers 286 if (src == nullptr || dst == nullptr) { 287 THROW(vmSymbols::java_lang_NullPointerException()); 288 } 289 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 290 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 291 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 292 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 293 // Do copy 294 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 295 JVM_END 296 297 298 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 299 JavaValue r(T_OBJECT); 300 // public synchronized Object put(Object key, Object value); 301 HandleMark hm(THREAD); 302 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 303 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK); 304 JavaCalls::call_virtual(&r, 305 props, 306 vmClasses::Properties_klass(), 307 vmSymbols::put_name(), 308 vmSymbols::object_object_object_signature(), 309 key_str, 310 value_str, 311 THREAD); 312 } 313 314 315 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 316 317 /* 318 * Return all of the system properties in a Java String array with alternating 319 * names and values from the jvm SystemProperty. 320 * Which includes some internal and all commandline -D defined properties. 321 */ 322 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 323 ResourceMark rm(THREAD); 324 HandleMark hm(THREAD); 325 int ndx = 0; 326 int fixedCount = 2; 327 328 SystemProperty* p = Arguments::system_properties(); 329 int count = Arguments::PropertyList_count(p); 330 331 // Allocate result String array 332 InstanceKlass* ik = vmClasses::String_klass(); 333 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 334 objArrayHandle result_h(THREAD, r); 335 336 while (p != nullptr) { 337 const char * key = p->key(); 338 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 339 const char * value = p->value(); 340 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 341 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL); 342 result_h->obj_at_put(ndx * 2, key_str()); 343 result_h->obj_at_put(ndx * 2 + 1, value_str()); 344 ndx++; 345 } 346 p = p->next(); 347 } 348 349 // Convert the -XX:MaxDirectMemorySize= command line flag 350 // to the sun.nio.MaxDirectMemorySize property. 351 // Do this after setting user properties to prevent people 352 // from setting the value with a -D option, as requested. 353 // Leave empty if not supplied 354 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 355 char as_chars[256]; 356 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 357 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 358 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 359 result_h->obj_at_put(ndx * 2, key_str()); 360 result_h->obj_at_put(ndx * 2 + 1, value_str()); 361 ndx++; 362 } 363 364 // JVM monitoring and management support 365 // Add the sun.management.compiler property for the compiler's name 366 { 367 #undef CSIZE 368 #if defined(_LP64) 369 #define CSIZE "64-Bit " 370 #else 371 #define CSIZE 372 #endif // 64bit 373 374 #if COMPILER1_AND_COMPILER2 375 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 376 #else 377 #if defined(COMPILER1) 378 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 379 #elif defined(COMPILER2) 380 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 381 #elif INCLUDE_JVMCI 382 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2" 383 #else 384 const char* compiler_name = ""; 385 #endif // compilers 386 #endif // COMPILER1_AND_COMPILER2 387 388 if (*compiler_name != '\0' && 389 (Arguments::mode() != Arguments::_int)) { 390 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 391 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 392 result_h->obj_at_put(ndx * 2, key_str()); 393 result_h->obj_at_put(ndx * 2 + 1, value_str()); 394 ndx++; 395 } 396 } 397 398 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 399 JVM_END 400 401 402 /* 403 * Return the temporary directory that the VM uses for the attach 404 * and perf data files. 405 * 406 * It is important that this directory is well-known and the 407 * same for all VM instances. It cannot be affected by configuration 408 * variables such as java.io.tmpdir. 409 */ 410 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 411 HandleMark hm(THREAD); 412 const char* temp_dir = os::get_temp_directory(); 413 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 414 return (jstring) JNIHandles::make_local(THREAD, h()); 415 JVM_END 416 417 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) { 418 if (len < 0) { 419 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative"); 420 } 421 elmClass->initialize(CHECK); 422 if (elmClass->is_array_klass() || elmClass->is_identity_class()) { 423 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class"); 424 } 425 if (elmClass->is_abstract()) { 426 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract"); 427 } 428 } 429 430 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to)) 431 oop o = JNIHandles::resolve_non_null(orig); 432 assert(o->is_array(), "Must be"); 433 oop array = nullptr; 434 arrayOop org = (arrayOop)o; 435 arrayHandle oh(THREAD, org); 436 ArrayKlass* ak = ArrayKlass::cast(org->klass()); 437 InlineKlass* vk = InlineKlass::cast(ak->element_klass()); 438 int len = to - from; // length of the new array 439 if (ak->is_null_free_array_klass()) { 440 if (from >= org->length() || to > org->length()) { 441 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements"); 442 } 443 } 444 if (org->is_flatArray()) { 445 FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass()); 446 LayoutKind lk = fak->layout_kind(); 447 array = oopFactory::new_flatArray(vk, len, lk, CHECK_NULL); 448 arrayHandle ah(THREAD, (arrayOop)array); 449 int end = to < oh()->length() ? to : oh()->length(); 450 for (int i = from; i < end; i++) { 451 void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper()); 452 void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper()); 453 vk->copy_payload_to_addr(src, dst, lk, false); 454 } 455 array = ah(); 456 } else { 457 if (org->is_null_free_array()) { 458 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL); 459 } else { 460 array = oopFactory::new_objArray(vk, len, CHECK_NULL); 461 } 462 int end = to < oh()->length() ? to : oh()->length(); 463 for (int i = from; i < end; i++) { 464 if (i < ((objArrayOop)oh())->length()) { 465 ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i)); 466 } else { 467 assert(!ak->is_null_free_array_klass(), "Must be a nullable array"); 468 ((objArrayOop)array)->obj_at_put(i - from, nullptr); 469 } 470 } 471 } 472 return (jarray) JNIHandles::make_local(THREAD, array); 473 JVM_END 474 475 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal)) 476 oop mirror = JNIHandles::resolve_non_null(elmClass); 477 oop init = JNIHandles::resolve(initVal); 478 if (init == nullptr) { 479 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null"); 480 } 481 Handle init_h(THREAD, init); 482 Klass* klass = java_lang_Class::as_Klass(mirror); 483 if (klass != init_h()->klass()) { 484 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value"); 485 } 486 validate_array_arguments(klass, len, CHECK_NULL); 487 InlineKlass* vk = InlineKlass::cast(klass); 488 oop array = nullptr; 489 if (vk->maybe_flat_in_array() && vk->has_non_atomic_layout()) { 490 array = oopFactory::new_flatArray(vk, len, LayoutKind::NON_ATOMIC_FLAT, CHECK_NULL); 491 for (int i = 0; i < len; i++) { 492 ((flatArrayOop)array)->write_value_to_flat_array(init_h(), i, CHECK_NULL); 493 } 494 } else { 495 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL); 496 for (int i = 0; i < len; i++) { 497 ((objArrayOop)array)->obj_at_put(i, init_h()); 498 } 499 } 500 return (jarray) JNIHandles::make_local(THREAD, array); 501 JVM_END 502 503 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal)) 504 oop mirror = JNIHandles::resolve_non_null(elmClass); 505 oop init = JNIHandles::resolve(initVal); 506 if (init == nullptr) { 507 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null"); 508 } 509 Handle init_h(THREAD, init); 510 Klass* klass = java_lang_Class::as_Klass(mirror); 511 if (klass != init_h()->klass()) { 512 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value"); 513 } 514 validate_array_arguments(klass, len, CHECK_NULL); 515 InlineKlass* vk = InlineKlass::cast(klass); 516 oop array = nullptr; 517 if (vk->maybe_flat_in_array() && vk->is_naturally_atomic() && vk->has_non_atomic_layout()) { 518 array = oopFactory::new_flatArray(vk, len, LayoutKind::NON_ATOMIC_FLAT, CHECK_NULL); 519 for (int i = 0; i < len; i++) { 520 ((flatArrayOop)array)->write_value_to_flat_array(init_h(), i, CHECK_NULL); 521 } 522 } else if (vk->maybe_flat_in_array() && vk->has_atomic_layout()) { 523 array = oopFactory::new_flatArray(vk, len, LayoutKind::ATOMIC_FLAT, CHECK_NULL); 524 for (int i = 0; i < len; i++) { 525 ((flatArrayOop)array)->write_value_to_flat_array(init_h(), i, CHECK_NULL); 526 } 527 } else { 528 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL); 529 for (int i = 0; i < len; i++) { 530 // need a type check here 531 532 ((objArrayOop)array)->obj_at_put(i, init_h()); 533 } 534 } 535 return (jarray) JNIHandles::make_local(THREAD, array); 536 JVM_END 537 538 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len)) 539 oop mirror = JNIHandles::resolve_non_null(elmClass); 540 Klass* klass = java_lang_Class::as_Klass(mirror); 541 klass->initialize(CHECK_NULL); 542 validate_array_arguments(klass, len, CHECK_NULL); 543 InlineKlass* vk = InlineKlass::cast(klass); 544 oop array = nullptr; 545 if (vk->maybe_flat_in_array() && vk->has_nullable_atomic_layout()) { 546 array = oopFactory::new_flatArray(vk, len, LayoutKind::NULLABLE_ATOMIC_FLAT, CHECK_NULL); 547 } else { 548 array = oopFactory::new_objArray(vk, len, CHECK_NULL); 549 } 550 return (jarray) JNIHandles::make_local(THREAD, array); 551 JVM_END 552 553 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj)) 554 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj)); 555 return oop->is_flatArray(); 556 JVM_END 557 558 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj)) 559 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj)); 560 return oop->is_null_free_array(); 561 JVM_END 562 563 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj)) 564 // There are multiple cases where an array can/must support atomic access: 565 // - the array is a reference array 566 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or ATOMIC_FLAT 567 // - the array is flat and its component type is naturally atomic 568 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj)); 569 if (oop->is_objArray()) return true; 570 if (oop->is_flatArray()) { 571 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass()); 572 if (fak->layout_kind() == LayoutKind::ATOMIC_FLAT || fak->layout_kind() == LayoutKind::NULLABLE_ATOMIC_FLAT) { 573 return true; 574 } 575 if (fak->element_klass()->is_naturally_atomic()) return true; 576 } 577 return false; 578 JVM_END 579 580 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 581 582 extern volatile jint vm_created; 583 584 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 585 EventShutdown event; 586 if (event.should_commit()) { 587 event.set_reason("Shutdown requested from Java"); 588 event.commit(); 589 } 590 JVM_END 591 592 593 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 594 before_exit(thread, true); 595 vm_exit(code); 596 JVM_END 597 598 599 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 600 if (!DisableExplicitGC) { 601 EventSystemGC event; 602 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent); 603 Universe::heap()->collect(GCCause::_java_lang_system_gc); 604 event.commit(); 605 } 606 JVM_END 607 608 609 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 610 return Universe::heap()->millis_since_last_whole_heap_examined(); 611 JVM_END 612 613 614 static inline jlong convert_size_t_to_jlong(size_t val) { 615 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 616 NOT_LP64 (return (jlong)val;) 617 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 618 } 619 620 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 621 size_t n = Universe::heap()->capacity(); 622 return convert_size_t_to_jlong(n); 623 JVM_END 624 625 626 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 627 size_t n = Universe::heap()->unused(); 628 return convert_size_t_to_jlong(n); 629 JVM_END 630 631 632 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 633 size_t n = Universe::heap()->max_capacity(); 634 return convert_size_t_to_jlong(n); 635 JVM_END 636 637 638 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 639 return os::active_processor_count(); 640 JVM_END 641 642 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void)) 643 #ifdef LINUX 644 if (UseContainerSupport) { 645 return JNI_TRUE; 646 } 647 #endif 648 return JNI_FALSE; 649 JVM_END 650 651 JVM_LEAF(jboolean, JVM_IsContainerized(void)) 652 #ifdef LINUX 653 if (OSContainer::is_containerized()) { 654 return JNI_TRUE; 655 } 656 #endif 657 return JNI_FALSE; 658 JVM_END 659 660 // java.lang.Throwable ////////////////////////////////////////////////////// 661 662 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 663 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 664 java_lang_Throwable::fill_in_stack_trace(exception); 665 JVM_END 666 667 // java.lang.NullPointerException /////////////////////////////////////////// 668 669 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 670 if (!ShowCodeDetailsInExceptionMessages) return nullptr; 671 672 oop exc = JNIHandles::resolve_non_null(throwable); 673 674 Method* method; 675 int bci; 676 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 677 return nullptr; 678 } 679 if (method->is_native()) { 680 return nullptr; 681 } 682 683 stringStream ss; 684 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 685 if (ok) { 686 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 687 return (jstring) JNIHandles::make_local(THREAD, result); 688 } else { 689 return nullptr; 690 } 691 JVM_END 692 693 // java.lang.StackTraceElement ////////////////////////////////////////////// 694 695 696 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth)) 697 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace)); 698 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 699 objArrayHandle stack_trace(THREAD, st); 700 // Fill in the allocated stack trace 701 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK); 702 JVM_END 703 704 705 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 706 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 707 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 708 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK); 709 JVM_END 710 711 712 // java.lang.StackWalker ////////////////////////////////////////////////////// 713 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj)) 714 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj)); 715 716 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr); 717 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr); 718 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info()); 719 if (!have_name) { 720 oop name = StringTable::intern(method->name(), CHECK); 721 java_lang_StackFrameInfo::set_name(stack_frame_info(), name); 722 } 723 if (!have_type) { 724 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK); 725 java_lang_StackFrameInfo::set_type(stack_frame_info(), type()); 726 } 727 JVM_END 728 729 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode, 730 jint skip_frames, jobject contScope, jobject cont, 731 jint buffer_size, jint start_index, jobjectArray frames)) 732 if (!thread->has_last_Java_frame()) { 733 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr); 734 } 735 736 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 737 Handle contScope_h(THREAD, JNIHandles::resolve(contScope)); 738 Handle cont_h(THREAD, JNIHandles::resolve(cont)); 739 // frames array is a ClassFrameInfo[] array when only getting caller reference, 740 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 741 // be null. 742 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 743 objArrayHandle frames_array_h(THREAD, fa); 744 745 if (frames_array_h->length() < buffer_size) { 746 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr); 747 } 748 749 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h, 750 buffer_size, start_index, frames_array_h, CHECK_NULL); 751 return JNIHandles::make_local(THREAD, result); 752 JVM_END 753 754 755 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor, 756 jint last_batch_count, jint buffer_size, jint start_index, 757 jobjectArray frames)) 758 // frames array is a ClassFrameInfo[] array when only getting caller reference, 759 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 760 // be null. 761 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 762 objArrayHandle frames_array_h(THREAD, fa); 763 764 if (frames_array_h->length() < buffer_size) { 765 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 766 } 767 768 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 769 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size, 770 start_index, frames_array_h, THREAD); 771 JVM_END 772 773 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont)) 774 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 775 objArrayHandle frames_array_h(THREAD, fa); 776 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 777 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont)); 778 779 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD); 780 JVM_END 781 782 // java.lang.Object /////////////////////////////////////////////// 783 784 785 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 786 // as implemented in the classic virtual machine; return 0 if object is null 787 if (handle == nullptr) { 788 return 0; 789 } 790 oop obj = JNIHandles::resolve_non_null(handle); 791 if (EnableValhalla && obj->klass()->is_inline_klass()) { 792 JavaValue result(T_INT); 793 JavaCallArguments args; 794 Handle ho(THREAD, obj); 795 args.push_oop(ho); 796 methodHandle method(THREAD, Universe::value_object_hash_code_method()); 797 JavaCalls::call(&result, method, &args, THREAD); 798 if (HAS_PENDING_EXCEPTION) { 799 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) { 800 Handle e(THREAD, PENDING_EXCEPTION); 801 CLEAR_PENDING_EXCEPTION; 802 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false); 803 } 804 } 805 return result.get_jint(); 806 } else { 807 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj)); 808 } 809 JVM_END 810 811 812 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 813 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 814 ObjectSynchronizer::wait(obj, ms, CHECK); 815 JVM_END 816 817 818 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 819 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 820 ObjectSynchronizer::notify(obj, CHECK); 821 JVM_END 822 823 824 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 825 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 826 ObjectSynchronizer::notifyall(obj, CHECK); 827 JVM_END 828 829 830 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 831 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 832 Klass* klass = obj->klass(); 833 JvmtiVMObjectAllocEventCollector oam; 834 835 #ifdef ASSERT 836 // Just checking that the cloneable flag is set correct 837 if (obj->is_array()) { 838 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 839 } else { 840 guarantee(obj->is_instance(), "should be instanceOop"); 841 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 842 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 843 } 844 #endif 845 846 // Check if class of obj supports the Cloneable interface. 847 // All arrays are considered to be cloneable (See JLS 20.1.5). 848 // All j.l.r.Reference classes are considered non-cloneable. 849 if (!klass->is_cloneable() || 850 (klass->is_instance_klass() && 851 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 852 ResourceMark rm(THREAD); 853 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 854 } 855 856 if (klass->is_inline_klass()) { 857 // Value instances have no identity, so return the current instance instead of allocating a new one 858 // Value classes cannot have finalizers, so the method can return immediately 859 return JNIHandles::make_local(THREAD, obj()); 860 } 861 862 // Make shallow object copy 863 const size_t size = obj->size(); 864 oop new_obj_oop = nullptr; 865 if (obj->is_array()) { 866 const int length = ((arrayOop)obj())->length(); 867 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 868 /* do_zero */ true, CHECK_NULL); 869 } else { 870 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 871 } 872 873 HeapAccess<>::clone(obj(), new_obj_oop, size); 874 875 Handle new_obj(THREAD, new_obj_oop); 876 // Caution: this involves a java upcall, so the clone should be 877 // "gc-robust" by this stage. 878 if (klass->has_finalizer()) { 879 assert(obj->is_instance(), "should be instanceOop"); 880 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 881 new_obj = Handle(THREAD, new_obj_oop); 882 } 883 884 return JNIHandles::make_local(THREAD, new_obj()); 885 JVM_END 886 887 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 888 889 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 890 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 891 JVM_END 892 893 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 894 return InstanceKlass::is_finalization_enabled(); 895 JVM_END 896 897 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 898 899 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 900 CONT_RegisterNativeMethods(env, cls); 901 JVM_END 902 903 // java.io.File /////////////////////////////////////////////////////////////// 904 905 JVM_LEAF(char*, JVM_NativePath(char* path)) 906 return os::native_path(path); 907 JVM_END 908 909 910 // Misc. class handling /////////////////////////////////////////////////////////// 911 912 913 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 914 // Getting the class of the caller frame. 915 // 916 // The call stack at this point looks something like this: 917 // 918 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ] 919 // [1] [ @CallerSensitive API.method ] 920 // [.] [ (skipped intermediate frames) ] 921 // [n] [ caller ] 922 vframeStream vfst(thread); 923 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 924 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 925 Method* m = vfst.method(); 926 assert(m != nullptr, "sanity"); 927 switch (n) { 928 case 0: 929 // This must only be called from Reflection.getCallerClass 930 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 931 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 932 } 933 // fall-through 934 case 1: 935 // Frame 0 and 1 must be caller sensitive. 936 if (!m->caller_sensitive()) { 937 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 938 } 939 break; 940 default: 941 if (!m->is_ignored_by_security_stack_walk()) { 942 // We have reached the desired frame; return the holder class. 943 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 944 } 945 break; 946 } 947 } 948 return nullptr; 949 JVM_END 950 951 952 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 953 oop mirror = nullptr; 954 BasicType t = name2type(utf); 955 if (t != T_ILLEGAL && !is_reference_type(t)) { 956 mirror = Universe::java_mirror(t); 957 } 958 if (mirror == nullptr) { 959 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 960 } else { 961 return (jclass) JNIHandles::make_local(THREAD, mirror); 962 } 963 JVM_END 964 965 966 // Returns a class loaded by the bootstrap class loader; or null 967 // if not found. ClassNotFoundException is not thrown. 968 // FindClassFromBootLoader is exported to the launcher for windows. 969 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 970 const char* name)) 971 // Java libraries should ensure that name is never null or illegal. 972 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 973 // It's impossible to create this class; the name cannot fit 974 // into the constant pool. 975 return nullptr; 976 } 977 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name"); 978 979 TempNewSymbol h_name = SymbolTable::new_symbol(name); 980 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 981 if (k == nullptr) { 982 return nullptr; 983 } 984 985 if (log_is_enabled(Debug, class, resolve)) { 986 trace_class_resolution(k); 987 } 988 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 989 JVM_END 990 991 // Find a class with this name in this loader, using the caller's protection domain. 992 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 993 jboolean init, jobject loader, 994 jclass caller)) 995 TempNewSymbol h_name = 996 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 997 CHECK_NULL); 998 999 oop loader_oop = JNIHandles::resolve(loader); 1000 oop from_class = JNIHandles::resolve(caller); 1001 Handle h_loader(THREAD, loader_oop); 1002 1003 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 1004 false, THREAD); 1005 1006 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1007 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 1008 } 1009 return result; 1010 JVM_END 1011 1012 // Currently only called from the old verifier. 1013 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 1014 jboolean init, jclass from)) 1015 TempNewSymbol h_name = 1016 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 1017 CHECK_NULL); 1018 oop from_class_oop = JNIHandles::resolve(from); 1019 Klass* from_class = (from_class_oop == nullptr) 1020 ? (Klass*)nullptr 1021 : java_lang_Class::as_Klass(from_class_oop); 1022 oop class_loader = nullptr; 1023 if (from_class != nullptr) { 1024 class_loader = from_class->class_loader(); 1025 } 1026 Handle h_loader(THREAD, class_loader); 1027 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread); 1028 1029 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1030 // this function is generally only used for class loading during verification. 1031 ResourceMark rm; 1032 oop from_mirror = JNIHandles::resolve_non_null(from); 1033 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 1034 const char * from_name = from_class->external_name(); 1035 1036 oop mirror = JNIHandles::resolve_non_null(result); 1037 Klass* to_class = java_lang_Class::as_Klass(mirror); 1038 const char * to = to_class->external_name(); 1039 log_debug(class, resolve)("%s %s (verification)", from_name, to); 1040 } 1041 1042 return result; 1043 JVM_END 1044 1045 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 1046 static jclass jvm_define_class_common(const char *name, 1047 jobject loader, const jbyte *buf, 1048 jsize len, jobject pd, const char *source, 1049 TRAPS) { 1050 if (source == nullptr) source = "__JVM_DefineClass__"; 1051 1052 JavaThread* jt = THREAD; 1053 1054 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 1055 ClassLoader::perf_define_appclass_selftime(), 1056 ClassLoader::perf_define_appclasses(), 1057 jt->get_thread_stat()->perf_recursion_counts_addr(), 1058 jt->get_thread_stat()->perf_timers_addr(), 1059 PerfClassTraceTime::DEFINE_CLASS); 1060 1061 if (UsePerfData) { 1062 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 1063 } 1064 1065 // Class resolution will get the class name from the .class stream if the name is null. 1066 TempNewSymbol class_name = name == nullptr ? nullptr : 1067 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1068 CHECK_NULL); 1069 1070 ResourceMark rm(THREAD); 1071 ClassFileStream st((u1*)buf, len, source); 1072 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 1073 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1074 ClassLoadInfo cl_info(protection_domain); 1075 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 1076 class_loader, 1077 cl_info, 1078 CHECK_NULL); 1079 1080 if (log_is_enabled(Debug, class, resolve)) { 1081 trace_class_resolution(k); 1082 } 1083 1084 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1085 } 1086 1087 enum { 1088 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 1089 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 1090 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 1091 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 1092 }; 1093 1094 /* 1095 * Define a class with the specified flags that indicates if it's a nestmate, 1096 * hidden, or strongly referenced from class loader. 1097 */ 1098 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 1099 const jbyte *buf, jsize len, jobject pd, 1100 jboolean init, int flags, jobject classData, TRAPS) { 1101 ResourceMark rm(THREAD); 1102 1103 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup)); 1104 // Lookup class must be a non-null instance 1105 if (lookup_k == nullptr) { 1106 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1107 } 1108 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass"); 1109 1110 Handle class_loader (THREAD, lookup_k->class_loader()); 1111 1112 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 1113 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1114 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1115 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1116 1117 InstanceKlass* host_class = nullptr; 1118 if (is_nestmate) { 1119 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL); 1120 } 1121 1122 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1123 name, 1124 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1125 is_nestmate ? host_class->external_name() : "", 1126 is_hidden ? "hidden" : "not hidden", 1127 is_strong ? "strong" : "weak", 1128 vm_annotations ? "with vm annotations" : "without vm annotation"); 1129 1130 if (!is_hidden) { 1131 // classData is only applicable for hidden classes 1132 if (classData != nullptr) { 1133 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1134 } 1135 if (is_nestmate) { 1136 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1137 } 1138 if (!is_strong) { 1139 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1140 } 1141 if (vm_annotations) { 1142 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1143 } 1144 if (flags != STRONG_LOADER_LINK) { 1145 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1146 err_msg("invalid flag 0x%x", flags)); 1147 } 1148 } 1149 1150 // Class resolution will get the class name from the .class stream if the name is null. 1151 TempNewSymbol class_name = name == nullptr ? nullptr : 1152 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1153 CHECK_NULL); 1154 1155 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1156 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1157 ClassFileStream st((u1*)buf, len, source); 1158 1159 InstanceKlass* ik = nullptr; 1160 if (!is_hidden) { 1161 ClassLoadInfo cl_info(protection_domain); 1162 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1163 class_loader, 1164 cl_info, 1165 CHECK_NULL); 1166 1167 if (log_is_enabled(Debug, class, resolve)) { 1168 trace_class_resolution(ik); 1169 } 1170 } else { // hidden 1171 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1172 ClassLoadInfo cl_info(protection_domain, 1173 host_class, 1174 classData_h, 1175 is_hidden, 1176 is_strong, 1177 vm_annotations); 1178 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1179 class_loader, 1180 cl_info, 1181 CHECK_NULL); 1182 1183 // The hidden class loader data has been artificially been kept alive to 1184 // this point. The mirror and any instances of this class have to keep 1185 // it alive afterwards. 1186 ik->class_loader_data()->dec_keep_alive_ref_count(); 1187 1188 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1189 ModuleEntry* module = ik->module(); 1190 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1191 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1192 module_name, 1193 ik->external_name(), 1194 host_class->external_name(), 1195 ik->is_hidden() ? "is hidden" : "is not hidden"); 1196 } 1197 } 1198 1199 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) { 1200 // non-hidden class or nestmate class must be in the same package as the Lookup class 1201 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages"); 1202 } 1203 1204 if (init) { 1205 ik->initialize(CHECK_NULL); 1206 } else { 1207 ik->link_class(CHECK_NULL); 1208 } 1209 1210 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1211 } 1212 1213 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1214 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1215 JVM_END 1216 1217 /* 1218 * Define a class with the specified lookup class. 1219 * lookup: Lookup class 1220 * name: the name of the class 1221 * buf: class bytes 1222 * len: length of class bytes 1223 * pd: protection domain 1224 * init: initialize the class 1225 * flags: properties of the class 1226 * classData: private static pre-initialized field 1227 */ 1228 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1229 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1230 1231 if (lookup == nullptr) { 1232 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1233 } 1234 1235 assert(buf != nullptr, "buf must not be null"); 1236 1237 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1238 JVM_END 1239 1240 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1241 1242 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1243 JVM_END 1244 1245 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1246 ResourceMark rm(THREAD); 1247 1248 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1249 char* str = java_lang_String::as_utf8_string(h_name()); 1250 1251 // Sanity check, don't expect null 1252 if (str == nullptr) return nullptr; 1253 1254 // Internalize the string, converting '.' to '/' in string. 1255 char* p = (char*)str; 1256 while (*p != '\0') { 1257 if (*p == '.') { 1258 *p = '/'; 1259 } 1260 p++; 1261 } 1262 1263 const int str_len = (int)(p - str); 1264 if (str_len > Symbol::max_length()) { 1265 // It's impossible to create this class; the name cannot fit 1266 // into the constant pool. 1267 return nullptr; 1268 } 1269 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1270 1271 // Security Note: 1272 // The Java level wrapper will perform the necessary security check allowing 1273 // us to pass the null as the initiating class loader. 1274 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1275 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader); 1276 #if INCLUDE_CDS 1277 if (k == nullptr) { 1278 // If the class is not already loaded, try to see if it's in the shared 1279 // archive for the current classloader (h_loader). 1280 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1281 } 1282 #endif 1283 return (k == nullptr) ? nullptr : 1284 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1285 JVM_END 1286 1287 // Module support ////////////////////////////////////////////////////////////////////////////// 1288 1289 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1290 jstring location, jobjectArray packages)) 1291 Handle h_module (THREAD, JNIHandles::resolve(module)); 1292 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1293 JVM_END 1294 1295 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1296 Handle h_module (THREAD, JNIHandles::resolve(module)); 1297 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1298 JVM_END 1299 1300 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1301 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1302 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1303 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1304 JVM_END 1305 1306 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1307 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1308 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1309 JVM_END 1310 1311 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1312 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1313 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1314 JVM_END 1315 1316 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1317 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1318 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1319 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1320 JVM_END 1321 1322 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1323 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1324 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1325 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1326 JVM_END 1327 1328 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1329 1330 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1331 assert (cls != nullptr, "illegal class"); 1332 JvmtiVMObjectAllocEventCollector oam; 1333 ResourceMark rm(THREAD); 1334 HandleMark hm(THREAD); 1335 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1336 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1337 return (jstring) JNIHandles::make_local(THREAD, result); 1338 JVM_END 1339 1340 1341 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1342 JvmtiVMObjectAllocEventCollector oam; 1343 oop mirror = JNIHandles::resolve_non_null(cls); 1344 1345 // Special handling for primitive objects 1346 if (java_lang_Class::is_primitive(mirror)) { 1347 // Primitive objects does not have any interfaces 1348 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1349 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1350 } 1351 1352 Klass* klass = java_lang_Class::as_Klass(mirror); 1353 // Figure size of result array 1354 int size; 1355 if (klass->is_instance_klass()) { 1356 InstanceKlass* ik = InstanceKlass::cast(klass); 1357 size = ik->local_interfaces()->length(); 1358 } else { 1359 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass"); 1360 size = 2; 1361 } 1362 1363 // Allocate result array 1364 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1365 objArrayHandle result (THREAD, r); 1366 // Fill in result 1367 if (klass->is_instance_klass()) { 1368 // Regular instance klass, fill in all local interfaces 1369 for (int index = 0; index < size; index++) { 1370 InstanceKlass* ik = InstanceKlass::cast(klass); 1371 Klass* k = ik->local_interfaces()->at(index); 1372 result->obj_at_put(index, k->java_mirror()); 1373 } 1374 } else { 1375 // All arrays implement java.lang.Cloneable and java.io.Serializable 1376 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1377 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1378 } 1379 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1380 JVM_END 1381 1382 1383 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1384 oop mirror = JNIHandles::resolve_non_null(cls); 1385 if (java_lang_Class::is_primitive(mirror)) { 1386 return JNI_FALSE; 1387 } 1388 Klass* k = java_lang_Class::as_Klass(mirror); 1389 return k->is_hidden(); 1390 JVM_END 1391 1392 class ScopedValueBindingsResolver { 1393 public: 1394 InstanceKlass* Carrier_klass; 1395 ScopedValueBindingsResolver(JavaThread* THREAD) { 1396 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD); 1397 Carrier_klass = InstanceKlass::cast(k); 1398 } 1399 }; 1400 1401 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1402 ResourceMark rm(THREAD); 1403 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1404 JvmtiVMObjectAllocEventCollector oam; 1405 1406 static ScopedValueBindingsResolver resolver(THREAD); 1407 1408 // Iterate through Java frames 1409 vframeStream vfst(thread); 1410 for(; !vfst.at_end(); vfst.next()) { 1411 int loc = -1; 1412 // get method of frame 1413 Method* method = vfst.method(); 1414 1415 Symbol *name = method->name(); 1416 1417 InstanceKlass* holder = method->method_holder(); 1418 if (name == vmSymbols::runWith_method_name()) { 1419 if (holder == vmClasses::Thread_klass() 1420 || holder == resolver.Carrier_klass) { 1421 loc = 1; 1422 } 1423 } 1424 1425 if (loc != -1) { 1426 javaVFrame *frame = vfst.asJavaVFrame(); 1427 StackValueCollection* locals = frame->locals(); 1428 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot 1429 Handle result = head_sv->get_obj(); 1430 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1431 if (result() != nullptr) { 1432 return JNIHandles::make_local(THREAD, result()); 1433 } 1434 } 1435 } 1436 1437 return nullptr; 1438 JVM_END 1439 1440 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1441 JvmtiVMObjectAllocEventCollector oam; 1442 // ofClass is a reference to a java_lang_Class object. The mirror object 1443 // of an InstanceKlass 1444 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1445 if (java_lang_Class::is_primitive(ofMirror) || 1446 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1447 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1448 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1449 } 1450 1451 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1452 InnerClassesIterator iter(k); 1453 1454 if (iter.length() == 0) { 1455 // Neither an inner nor outer class 1456 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1457 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1458 } 1459 1460 // find inner class info 1461 constantPoolHandle cp(thread, k->constants()); 1462 int length = iter.length(); 1463 1464 // Allocate temp. result array 1465 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL); 1466 objArrayHandle result (THREAD, r); 1467 int members = 0; 1468 1469 for (; !iter.done(); iter.next()) { 1470 int ioff = iter.inner_class_info_index(); 1471 int ooff = iter.outer_class_info_index(); 1472 1473 if (ioff != 0 && ooff != 0) { 1474 // Check to see if the name matches the class we're looking for 1475 // before attempting to find the class. 1476 if (cp->klass_name_at_matches(k, ooff)) { 1477 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1478 if (outer_klass == k) { 1479 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1480 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1481 1482 // Throws an exception if outer klass has not declared k as 1483 // an inner klass 1484 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1485 1486 result->obj_at_put(members, inner_klass->java_mirror()); 1487 members++; 1488 } 1489 } 1490 } 1491 } 1492 1493 if (members != length) { 1494 // Return array of right length 1495 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL); 1496 for(int i = 0; i < members; i++) { 1497 res->obj_at_put(i, result->obj_at(i)); 1498 } 1499 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1500 } 1501 1502 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1503 JVM_END 1504 1505 1506 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1507 { 1508 // ofClass is a reference to a java_lang_Class object. 1509 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1510 if (java_lang_Class::is_primitive(ofMirror)) { 1511 return nullptr; 1512 } 1513 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1514 if (!klass->is_instance_klass()) { 1515 return nullptr; 1516 } 1517 1518 bool inner_is_member = false; 1519 Klass* outer_klass 1520 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1521 if (outer_klass == nullptr) return nullptr; // already a top-level class 1522 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1523 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1524 } 1525 JVM_END 1526 1527 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1528 { 1529 oop mirror = JNIHandles::resolve_non_null(cls); 1530 if (java_lang_Class::is_primitive(mirror)) { 1531 return nullptr; 1532 } 1533 Klass* klass = java_lang_Class::as_Klass(mirror); 1534 if (!klass->is_instance_klass()) { 1535 return nullptr; 1536 } 1537 InstanceKlass* k = InstanceKlass::cast(klass); 1538 int ooff = 0, noff = 0; 1539 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1540 if (noff != 0) { 1541 constantPoolHandle i_cp(thread, k->constants()); 1542 Symbol* name = i_cp->symbol_at(noff); 1543 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1544 return (jstring) JNIHandles::make_local(THREAD, str()); 1545 } 1546 } 1547 return nullptr; 1548 } 1549 JVM_END 1550 1551 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1552 assert (cls != nullptr, "illegal class"); 1553 JvmtiVMObjectAllocEventCollector oam; 1554 ResourceMark rm(THREAD); 1555 oop mirror = JNIHandles::resolve_non_null(cls); 1556 // Return null for arrays and primitives 1557 if (!java_lang_Class::is_primitive(mirror)) { 1558 Klass* k = java_lang_Class::as_Klass(mirror); 1559 if (k->is_instance_klass()) { 1560 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1561 if (sym == nullptr) return nullptr; 1562 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1563 return (jstring) JNIHandles::make_local(THREAD, str()); 1564 } 1565 } 1566 return nullptr; 1567 JVM_END 1568 1569 1570 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1571 assert (cls != nullptr, "illegal class"); 1572 oop mirror = JNIHandles::resolve_non_null(cls); 1573 // Return null for arrays and primitives 1574 if (!java_lang_Class::is_primitive(mirror)) { 1575 Klass* k = java_lang_Class::as_Klass(mirror); 1576 if (k->is_instance_klass()) { 1577 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1578 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1579 } 1580 } 1581 return nullptr; 1582 JVM_END 1583 1584 1585 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1586 // some of this code was adapted from from jni_FromReflectedField 1587 1588 oop reflected = JNIHandles::resolve_non_null(field); 1589 oop mirror = java_lang_reflect_Field::clazz(reflected); 1590 Klass* k = java_lang_Class::as_Klass(mirror); 1591 int slot = java_lang_reflect_Field::slot(reflected); 1592 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1593 1594 InstanceKlass* ik = InstanceKlass::cast(k); 1595 int offset = ik->field_offset(slot); 1596 1597 if (modifiers & JVM_ACC_STATIC) { 1598 // for static fields we only look in the current class 1599 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1600 assert(false, "cannot find static field"); 1601 return false; 1602 } 1603 } else { 1604 // for instance fields we start with the current class and work 1605 // our way up through the superclass chain 1606 if (!ik->find_field_from_offset(offset, false, &fd)) { 1607 assert(false, "cannot find instance field"); 1608 return false; 1609 } 1610 } 1611 return true; 1612 } 1613 1614 static Method* jvm_get_method_common(jobject method) { 1615 // some of this code was adapted from from jni_FromReflectedMethod 1616 1617 oop reflected = JNIHandles::resolve_non_null(method); 1618 oop mirror = nullptr; 1619 int slot = 0; 1620 1621 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1622 mirror = java_lang_reflect_Constructor::clazz(reflected); 1623 slot = java_lang_reflect_Constructor::slot(reflected); 1624 } else { 1625 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1626 "wrong type"); 1627 mirror = java_lang_reflect_Method::clazz(reflected); 1628 slot = java_lang_reflect_Method::slot(reflected); 1629 } 1630 Klass* k = java_lang_Class::as_Klass(mirror); 1631 1632 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1633 assert(m != nullptr, "cannot find method"); 1634 return m; // caller has to deal with null in product mode 1635 } 1636 1637 /* Type use annotations support (JDK 1.8) */ 1638 1639 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1640 assert (cls != nullptr, "illegal class"); 1641 ResourceMark rm(THREAD); 1642 // Return null for arrays and primitives 1643 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1644 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1645 if (k->is_instance_klass()) { 1646 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1647 if (type_annotations != nullptr) { 1648 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1649 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1650 } 1651 } 1652 } 1653 return nullptr; 1654 JVM_END 1655 1656 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1657 assert (method != nullptr, "illegal method"); 1658 // method is a handle to a java.lang.reflect.Method object 1659 Method* m = jvm_get_method_common(method); 1660 if (m == nullptr) { 1661 return nullptr; 1662 } 1663 1664 AnnotationArray* type_annotations = m->type_annotations(); 1665 if (type_annotations != nullptr) { 1666 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1667 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1668 } 1669 1670 return nullptr; 1671 JVM_END 1672 1673 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1674 assert (field != nullptr, "illegal field"); 1675 fieldDescriptor fd; 1676 bool gotFd = jvm_get_field_common(field, fd); 1677 if (!gotFd) { 1678 return nullptr; 1679 } 1680 1681 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1682 JVM_END 1683 1684 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1685 if (!cp->is_within_bounds(index)) { 1686 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1687 } 1688 } 1689 1690 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1691 { 1692 // method is a handle to a java.lang.reflect.Method object 1693 Method* method_ptr = jvm_get_method_common(method); 1694 methodHandle mh (THREAD, method_ptr); 1695 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1696 const int num_params = mh->method_parameters_length(); 1697 1698 if (num_params < 0) { 1699 // A -1 return value from method_parameters_length means there is no 1700 // parameter data. Return null to indicate this to the reflection 1701 // API. 1702 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1703 return (jobjectArray)nullptr; 1704 } else { 1705 // Otherwise, we return something up to reflection, even if it is 1706 // a zero-length array. Why? Because in some cases this can 1707 // trigger a MalformedParametersException. 1708 1709 // make sure all the symbols are properly formatted 1710 for (int i = 0; i < num_params; i++) { 1711 MethodParametersElement* params = mh->method_parameters_start(); 1712 int index = params[i].name_cp_index; 1713 constantPoolHandle cp(THREAD, mh->constants()); 1714 bounds_check(cp, index, CHECK_NULL); 1715 1716 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1717 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1718 "Wrong type at constant pool index"); 1719 } 1720 1721 } 1722 1723 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1724 objArrayHandle result (THREAD, result_oop); 1725 1726 for (int i = 0; i < num_params; i++) { 1727 MethodParametersElement* params = mh->method_parameters_start(); 1728 // For a 0 index, give a null symbol 1729 Symbol* sym = 0 != params[i].name_cp_index ? 1730 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1731 int flags = params[i].flags; 1732 oop param = Reflection::new_parameter(reflected_method, i, sym, 1733 flags, CHECK_NULL); 1734 result->obj_at_put(i, param); 1735 } 1736 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1737 } 1738 } 1739 JVM_END 1740 1741 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1742 1743 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1744 { 1745 JvmtiVMObjectAllocEventCollector oam; 1746 1747 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1748 // Exclude primitive types and array types 1749 if (java_lang_Class::is_primitive(ofMirror) || 1750 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1751 // Return empty array 1752 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1753 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1754 } 1755 1756 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1757 constantPoolHandle cp(THREAD, k->constants()); 1758 1759 // Ensure class is linked 1760 k->link_class(CHECK_NULL); 1761 1762 // Allocate result 1763 int num_fields; 1764 1765 if (publicOnly) { 1766 num_fields = 0; 1767 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1768 if (fs.access_flags().is_public()) ++num_fields; 1769 } 1770 } else { 1771 num_fields = k->java_fields_count(); 1772 } 1773 1774 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1775 objArrayHandle result (THREAD, r); 1776 1777 int out_idx = 0; 1778 fieldDescriptor fd; 1779 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1780 if (!publicOnly || fs.access_flags().is_public()) { 1781 fd.reinitialize(k, fs.to_FieldInfo()); 1782 oop field = Reflection::new_field(&fd, CHECK_NULL); 1783 result->obj_at_put(out_idx, field); 1784 ++out_idx; 1785 } 1786 } 1787 assert(out_idx == num_fields, "just checking"); 1788 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1789 } 1790 JVM_END 1791 1792 // A class is a record if and only if it is final and a direct subclass of 1793 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1794 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1795 { 1796 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1797 if (k != nullptr && k->is_instance_klass()) { 1798 InstanceKlass* ik = InstanceKlass::cast(k); 1799 return ik->is_record(); 1800 } else { 1801 return false; 1802 } 1803 } 1804 JVM_END 1805 1806 // Returns an array containing the components of the Record attribute, 1807 // or null if the attribute is not present. 1808 // 1809 // Note that this function returns the components of the Record attribute 1810 // even if the class is not a record. 1811 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1812 { 1813 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1814 assert(c->is_instance_klass(), "must be"); 1815 InstanceKlass* ik = InstanceKlass::cast(c); 1816 1817 Array<RecordComponent*>* components = ik->record_components(); 1818 if (components != nullptr) { 1819 JvmtiVMObjectAllocEventCollector oam; 1820 constantPoolHandle cp(THREAD, ik->constants()); 1821 int length = components->length(); 1822 assert(length >= 0, "unexpected record_components length"); 1823 objArrayOop record_components = 1824 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1825 objArrayHandle components_h (THREAD, record_components); 1826 1827 for (int x = 0; x < length; x++) { 1828 RecordComponent* component = components->at(x); 1829 assert(component != nullptr, "unexpected null record component"); 1830 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1831 components_h->obj_at_put(x, component_oop); 1832 } 1833 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1834 } 1835 1836 return nullptr; 1837 } 1838 JVM_END 1839 1840 static jobjectArray get_class_declared_methods_helper( 1841 JNIEnv *env, 1842 jclass ofClass, jboolean publicOnly, 1843 bool want_constructor, 1844 Klass* klass, TRAPS) { 1845 1846 JvmtiVMObjectAllocEventCollector oam; 1847 1848 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1849 // Exclude primitive types and array types 1850 if (java_lang_Class::is_primitive(ofMirror) 1851 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1852 // Return empty array 1853 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1854 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1855 } 1856 1857 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1858 1859 // Ensure class is linked 1860 k->link_class(CHECK_NULL); 1861 1862 Array<Method*>* methods = k->methods(); 1863 int methods_length = methods->length(); 1864 1865 // Save original method_idnum in case of redefinition, which can change 1866 // the idnum of obsolete methods. The new method will have the same idnum 1867 // but if we refresh the methods array, the counts will be wrong. 1868 ResourceMark rm(THREAD); 1869 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1870 int num_methods = 0; 1871 1872 // Select methods matching the criteria. 1873 for (int i = 0; i < methods_length; i++) { 1874 Method* method = methods->at(i); 1875 if (want_constructor && !method->is_object_constructor()) { 1876 continue; 1877 } 1878 if (!want_constructor && 1879 (method->is_object_constructor() || method->is_class_initializer() || 1880 method->is_overpass())) { 1881 continue; 1882 } 1883 if (publicOnly && !method->is_public()) { 1884 continue; 1885 } 1886 idnums->push(method->method_idnum()); 1887 ++num_methods; 1888 } 1889 1890 // Allocate result 1891 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1892 objArrayHandle result (THREAD, r); 1893 1894 // Now just put the methods that we selected above, but go by their idnum 1895 // in case of redefinition. The methods can be redefined at any safepoint, 1896 // so above when allocating the oop array and below when creating reflect 1897 // objects. 1898 for (int i = 0; i < num_methods; i++) { 1899 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1900 if (method.is_null()) { 1901 // Method may have been deleted and seems this API can handle null 1902 // Otherwise should probably put a method that throws NSME 1903 result->obj_at_put(i, nullptr); 1904 } else { 1905 oop m; 1906 if (want_constructor) { 1907 assert(method->is_object_constructor(), "must be"); 1908 m = Reflection::new_constructor(method, CHECK_NULL); 1909 } else { 1910 m = Reflection::new_method(method, false, CHECK_NULL); 1911 } 1912 result->obj_at_put(i, m); 1913 } 1914 } 1915 1916 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1917 } 1918 1919 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1920 { 1921 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1922 /*want_constructor*/ false, 1923 vmClasses::reflect_Method_klass(), THREAD); 1924 } 1925 JVM_END 1926 1927 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1928 { 1929 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1930 /*want_constructor*/ true, 1931 vmClasses::reflect_Constructor_klass(), THREAD); 1932 } 1933 JVM_END 1934 1935 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1936 { 1937 oop mirror = JNIHandles::resolve_non_null(cls); 1938 if (java_lang_Class::is_primitive(mirror)) { 1939 // Primitive type 1940 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1941 } 1942 1943 Klass* k = java_lang_Class::as_Klass(mirror); 1944 return k->access_flags().as_class_flags(); 1945 } 1946 JVM_END 1947 1948 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1949 { 1950 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1951 assert(c->is_instance_klass(), "must be"); 1952 InstanceKlass* ck = InstanceKlass::cast(c); 1953 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 1954 assert(m->is_instance_klass(), "must be"); 1955 InstanceKlass* mk = InstanceKlass::cast(m); 1956 return ck->has_nestmate_access_to(mk, THREAD); 1957 } 1958 JVM_END 1959 1960 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1961 { 1962 // current is not a primitive or array class 1963 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1964 assert(c->is_instance_klass(), "must be"); 1965 InstanceKlass* ck = InstanceKlass::cast(c); 1966 InstanceKlass* host = ck->nest_host(THREAD); 1967 return (jclass) (host == nullptr ? nullptr : 1968 JNIHandles::make_local(THREAD, host->java_mirror())); 1969 } 1970 JVM_END 1971 1972 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1973 { 1974 // current is not a primitive or array class 1975 ResourceMark rm(THREAD); 1976 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1977 assert(c->is_instance_klass(), "must be"); 1978 InstanceKlass* ck = InstanceKlass::cast(c); 1979 InstanceKlass* host = ck->nest_host(THREAD); 1980 1981 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 1982 ck->external_name(), host->external_name()); 1983 { 1984 JvmtiVMObjectAllocEventCollector oam; 1985 Array<u2>* members = host->nest_members(); 1986 int length = members == nullptr ? 0 : members->length(); 1987 1988 log_trace(class, nestmates)(" - host has %d listed nest members", length); 1989 1990 // nest host is first in the array so make it one bigger 1991 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 1992 length + 1, CHECK_NULL); 1993 objArrayHandle result(THREAD, r); 1994 result->obj_at_put(0, host->java_mirror()); 1995 if (length != 0) { 1996 int count = 0; 1997 for (int i = 0; i < length; i++) { 1998 int cp_index = members->at(i); 1999 Klass* k = host->constants()->klass_at(cp_index, THREAD); 2000 if (HAS_PENDING_EXCEPTION) { 2001 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2002 return nullptr; // propagate VMEs 2003 } 2004 if (log_is_enabled(Trace, class, nestmates)) { 2005 stringStream ss; 2006 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2007 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2008 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2009 log_trace(class, nestmates)("%s", ss.as_string()); 2010 } 2011 CLEAR_PENDING_EXCEPTION; 2012 continue; 2013 } 2014 if (k->is_instance_klass()) { 2015 InstanceKlass* ik = InstanceKlass::cast(k); 2016 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2017 if (nest_host_k == host) { 2018 result->obj_at_put(count+1, k->java_mirror()); 2019 count++; 2020 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2021 } else { 2022 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2023 ik->external_name(), nest_host_k->external_name()); 2024 } 2025 } else { 2026 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2027 k->external_name()); 2028 } 2029 } 2030 if (count < length) { 2031 // we had invalid entries so we need to compact the array 2032 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2033 length + 1, count + 1); 2034 2035 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2036 count + 1, CHECK_NULL); 2037 objArrayHandle result2(THREAD, r2); 2038 for (int i = 0; i < count + 1; i++) { 2039 result2->obj_at_put(i, result->obj_at(i)); 2040 } 2041 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2042 } 2043 } 2044 else { 2045 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate"); 2046 } 2047 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2048 } 2049 } 2050 JVM_END 2051 2052 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2053 { 2054 oop mirror = JNIHandles::resolve_non_null(current); 2055 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2056 Klass* c = java_lang_Class::as_Klass(mirror); 2057 assert(c->is_instance_klass(), "must be"); 2058 InstanceKlass* ik = InstanceKlass::cast(c); 2059 ResourceMark rm(THREAD); 2060 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2061 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2062 if (ik->is_sealed()) { 2063 JvmtiVMObjectAllocEventCollector oam; 2064 Array<u2>* subclasses = ik->permitted_subclasses(); 2065 int length = subclasses->length(); 2066 2067 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2068 2069 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2070 length, CHECK_NULL); 2071 objArrayHandle result(THREAD, r); 2072 int count = 0; 2073 for (int i = 0; i < length; i++) { 2074 int cp_index = subclasses->at(i); 2075 Klass* k = ik->constants()->klass_at(cp_index, THREAD); 2076 if (HAS_PENDING_EXCEPTION) { 2077 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2078 return nullptr; // propagate VMEs 2079 } 2080 if (log_is_enabled(Trace, class, sealed)) { 2081 stringStream ss; 2082 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2083 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2084 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2085 log_trace(class, sealed)("%s", ss.as_string()); 2086 } 2087 2088 CLEAR_PENDING_EXCEPTION; 2089 continue; 2090 } 2091 if (k->is_instance_klass()) { 2092 result->obj_at_put(count++, k->java_mirror()); 2093 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2094 } 2095 } 2096 if (count < length) { 2097 // we had invalid entries so we need to compact the array 2098 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2099 count, CHECK_NULL); 2100 objArrayHandle result2(THREAD, r2); 2101 for (int i = 0; i < count; i++) { 2102 result2->obj_at_put(i, result->obj_at(i)); 2103 } 2104 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2105 } 2106 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2107 } else { 2108 return nullptr; 2109 } 2110 } 2111 JVM_END 2112 2113 // Constant pool access ////////////////////////////////////////////////////////// 2114 2115 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2116 { 2117 JvmtiVMObjectAllocEventCollector oam; 2118 oop mirror = JNIHandles::resolve_non_null(cls); 2119 // Return null for primitives and arrays 2120 if (!java_lang_Class::is_primitive(mirror)) { 2121 Klass* k = java_lang_Class::as_Klass(mirror); 2122 if (k->is_instance_klass()) { 2123 InstanceKlass* k_h = InstanceKlass::cast(k); 2124 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2125 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2126 return JNIHandles::make_local(THREAD, jcp()); 2127 } 2128 } 2129 return nullptr; 2130 } 2131 JVM_END 2132 2133 2134 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2135 { 2136 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2137 return cp->length(); 2138 } 2139 JVM_END 2140 2141 2142 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2143 { 2144 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2145 bounds_check(cp, index, CHECK_NULL); 2146 constantTag tag = cp->tag_at(index); 2147 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2148 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2149 } 2150 Klass* k = cp->klass_at(index, CHECK_NULL); 2151 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2152 } 2153 JVM_END 2154 2155 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2156 { 2157 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2158 bounds_check(cp, index, CHECK_NULL); 2159 constantTag tag = cp->tag_at(index); 2160 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2161 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2162 } 2163 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2164 if (k == nullptr) return nullptr; 2165 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2166 } 2167 JVM_END 2168 2169 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2170 constantTag tag = cp->tag_at(index); 2171 if (!tag.is_method() && !tag.is_interface_method()) { 2172 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2173 } 2174 int klass_ref = cp->uncached_klass_ref_index_at(index); 2175 Klass* k_o; 2176 if (force_resolution) { 2177 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2178 } else { 2179 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2180 if (k_o == nullptr) return nullptr; 2181 } 2182 InstanceKlass* k = InstanceKlass::cast(k_o); 2183 Symbol* name = cp->uncached_name_ref_at(index); 2184 Symbol* sig = cp->uncached_signature_ref_at(index); 2185 methodHandle m (THREAD, k->find_method(name, sig)); 2186 if (m.is_null()) { 2187 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2188 } 2189 oop method; 2190 if (m->is_object_constructor()) { 2191 method = Reflection::new_constructor(m, CHECK_NULL); 2192 } else { 2193 method = Reflection::new_method(m, true, CHECK_NULL); 2194 } 2195 return JNIHandles::make_local(THREAD, method); 2196 } 2197 2198 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2199 { 2200 JvmtiVMObjectAllocEventCollector oam; 2201 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2202 bounds_check(cp, index, CHECK_NULL); 2203 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2204 return res; 2205 } 2206 JVM_END 2207 2208 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2209 { 2210 JvmtiVMObjectAllocEventCollector oam; 2211 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2212 bounds_check(cp, index, CHECK_NULL); 2213 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2214 return res; 2215 } 2216 JVM_END 2217 2218 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2219 constantTag tag = cp->tag_at(index); 2220 if (!tag.is_field()) { 2221 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2222 } 2223 int klass_ref = cp->uncached_klass_ref_index_at(index); 2224 Klass* k_o; 2225 if (force_resolution) { 2226 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2227 } else { 2228 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2229 if (k_o == nullptr) return nullptr; 2230 } 2231 InstanceKlass* k = InstanceKlass::cast(k_o); 2232 Symbol* name = cp->uncached_name_ref_at(index); 2233 Symbol* sig = cp->uncached_signature_ref_at(index); 2234 fieldDescriptor fd; 2235 Klass* target_klass = k->find_field(name, sig, &fd); 2236 if (target_klass == nullptr) { 2237 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2238 } 2239 oop field = Reflection::new_field(&fd, CHECK_NULL); 2240 return JNIHandles::make_local(THREAD, field); 2241 } 2242 2243 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2244 { 2245 JvmtiVMObjectAllocEventCollector oam; 2246 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2247 bounds_check(cp, index, CHECK_NULL); 2248 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2249 return res; 2250 } 2251 JVM_END 2252 2253 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2254 { 2255 JvmtiVMObjectAllocEventCollector oam; 2256 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2257 bounds_check(cp, index, CHECK_NULL); 2258 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2259 return res; 2260 } 2261 JVM_END 2262 2263 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2264 { 2265 JvmtiVMObjectAllocEventCollector oam; 2266 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2267 bounds_check(cp, index, CHECK_NULL); 2268 constantTag tag = cp->tag_at(index); 2269 if (!tag.is_field_or_method()) { 2270 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2271 } 2272 int klass_ref = cp->uncached_klass_ref_index_at(index); 2273 Symbol* klass_name = cp->klass_name_at(klass_ref); 2274 Symbol* member_name = cp->uncached_name_ref_at(index); 2275 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2276 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2277 objArrayHandle dest(THREAD, dest_o); 2278 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2279 dest->obj_at_put(0, str()); 2280 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2281 dest->obj_at_put(1, str()); 2282 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2283 dest->obj_at_put(2, str()); 2284 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2285 } 2286 JVM_END 2287 2288 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2289 { 2290 JvmtiVMObjectAllocEventCollector oam; 2291 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2292 bounds_check(cp, index, CHECK_0); 2293 constantTag tag = cp->tag_at(index); 2294 if (!tag.is_field_or_method()) { 2295 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2296 } 2297 return (jint) cp->uncached_klass_ref_index_at(index); 2298 } 2299 JVM_END 2300 2301 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2302 { 2303 JvmtiVMObjectAllocEventCollector oam; 2304 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2305 bounds_check(cp, index, CHECK_0); 2306 constantTag tag = cp->tag_at(index); 2307 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2308 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2309 } 2310 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2311 } 2312 JVM_END 2313 2314 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2315 { 2316 JvmtiVMObjectAllocEventCollector oam; 2317 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2318 bounds_check(cp, index, CHECK_NULL); 2319 constantTag tag = cp->tag_at(index); 2320 if (!tag.is_name_and_type()) { 2321 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2322 } 2323 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2324 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2325 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2326 objArrayHandle dest(THREAD, dest_o); 2327 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2328 dest->obj_at_put(0, str()); 2329 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2330 dest->obj_at_put(1, str()); 2331 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2332 } 2333 JVM_END 2334 2335 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2336 { 2337 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2338 bounds_check(cp, index, CHECK_0); 2339 constantTag tag = cp->tag_at(index); 2340 if (!tag.is_int()) { 2341 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2342 } 2343 return cp->int_at(index); 2344 } 2345 JVM_END 2346 2347 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2348 { 2349 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2350 bounds_check(cp, index, CHECK_(0L)); 2351 constantTag tag = cp->tag_at(index); 2352 if (!tag.is_long()) { 2353 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2354 } 2355 return cp->long_at(index); 2356 } 2357 JVM_END 2358 2359 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2360 { 2361 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2362 bounds_check(cp, index, CHECK_(0.0f)); 2363 constantTag tag = cp->tag_at(index); 2364 if (!tag.is_float()) { 2365 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2366 } 2367 return cp->float_at(index); 2368 } 2369 JVM_END 2370 2371 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2372 { 2373 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2374 bounds_check(cp, index, CHECK_(0.0)); 2375 constantTag tag = cp->tag_at(index); 2376 if (!tag.is_double()) { 2377 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2378 } 2379 return cp->double_at(index); 2380 } 2381 JVM_END 2382 2383 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2384 { 2385 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2386 bounds_check(cp, index, CHECK_NULL); 2387 constantTag tag = cp->tag_at(index); 2388 if (!tag.is_string()) { 2389 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2390 } 2391 oop str = cp->string_at(index, CHECK_NULL); 2392 return (jstring) JNIHandles::make_local(THREAD, str); 2393 } 2394 JVM_END 2395 2396 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2397 { 2398 JvmtiVMObjectAllocEventCollector oam; 2399 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2400 bounds_check(cp, index, CHECK_NULL); 2401 constantTag tag = cp->tag_at(index); 2402 if (!tag.is_symbol()) { 2403 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2404 } 2405 Symbol* sym = cp->symbol_at(index); 2406 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2407 return (jstring) JNIHandles::make_local(THREAD, str()); 2408 } 2409 JVM_END 2410 2411 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2412 { 2413 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2414 bounds_check(cp, index, CHECK_0); 2415 constantTag tag = cp->tag_at(index); 2416 jbyte result = tag.value(); 2417 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2418 // they are changed to the corresponding tags from the JVM spec, so that java code in 2419 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2420 if (tag.is_klass_or_reference()) { 2421 result = JVM_CONSTANT_Class; 2422 } else if (tag.is_string_index()) { 2423 result = JVM_CONSTANT_String; 2424 } else if (tag.is_method_type_in_error()) { 2425 result = JVM_CONSTANT_MethodType; 2426 } else if (tag.is_method_handle_in_error()) { 2427 result = JVM_CONSTANT_MethodHandle; 2428 } else if (tag.is_dynamic_constant_in_error()) { 2429 result = JVM_CONSTANT_Dynamic; 2430 } 2431 return result; 2432 } 2433 JVM_END 2434 2435 // Assertion support. ////////////////////////////////////////////////////////// 2436 2437 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2438 assert(cls != nullptr, "bad class"); 2439 2440 oop r = JNIHandles::resolve(cls); 2441 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2442 if (java_lang_Class::is_primitive(r)) return false; 2443 2444 Klass* k = java_lang_Class::as_Klass(r); 2445 assert(k->is_instance_klass(), "must be an instance klass"); 2446 if (!k->is_instance_klass()) return false; 2447 2448 ResourceMark rm(THREAD); 2449 const char* name = k->name()->as_C_string(); 2450 bool system_class = k->class_loader() == nullptr; 2451 return JavaAssertions::enabled(name, system_class); 2452 2453 JVM_END 2454 2455 2456 // Return a new AssertionStatusDirectives object with the fields filled in with 2457 // command-line assertion arguments (i.e., -ea, -da). 2458 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2459 JvmtiVMObjectAllocEventCollector oam; 2460 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2461 return JNIHandles::make_local(THREAD, asd); 2462 JVM_END 2463 2464 // Verification //////////////////////////////////////////////////////////////////////////////// 2465 2466 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2467 2468 // RedefineClasses support: bug 6214132 caused verification to fail. 2469 // All functions from this section should call the jvmtiThreadSate function: 2470 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2471 // The function returns a Klass* of the _scratch_class if the verifier 2472 // was invoked in the middle of the class redefinition. 2473 // Otherwise it returns its argument value which is the _the_class Klass*. 2474 // Please, refer to the description in the jvmtiThreadState.hpp. 2475 2476 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 2477 oop mirror = JNIHandles::resolve_non_null(cls); 2478 if (java_lang_Class::is_primitive(mirror)) { 2479 return JNI_FALSE; 2480 } 2481 Klass* k = java_lang_Class::as_Klass(mirror); 2482 // This isn't necessary since answer is the same since redefinition 2483 // has already checked this matches for the scratch class. 2484 // k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2485 jboolean result = k->is_interface(); 2486 assert(!result || k->is_instance_klass(), 2487 "all interfaces are instance types"); 2488 return result; 2489 JVM_END 2490 2491 2492 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2493 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2494 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2495 return k->name()->as_utf8(); 2496 JVM_END 2497 2498 2499 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2500 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2501 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2502 // types will have length zero if this is not an InstanceKlass 2503 // (length is determined by call to JVM_GetClassCPEntriesCount) 2504 if (k->is_instance_klass()) { 2505 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2506 for (int index = cp->length() - 1; index >= 0; index--) { 2507 constantTag tag = cp->tag_at(index); 2508 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2509 } 2510 } 2511 JVM_END 2512 2513 2514 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2515 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2516 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2517 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2518 JVM_END 2519 2520 2521 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2522 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2523 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2524 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2525 JVM_END 2526 2527 2528 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2529 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2530 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2531 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2532 JVM_END 2533 2534 2535 // The following methods, used for the verifier, are never called with 2536 // array klasses, so a direct cast to InstanceKlass is safe. 2537 // Typically, these methods are called in a loop with bounds determined 2538 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2539 // zero for arrays. 2540 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2541 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2542 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2543 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2544 int length = method->checked_exceptions_length(); 2545 if (length > 0) { 2546 CheckedExceptionElement* table= method->checked_exceptions_start(); 2547 for (int i = 0; i < length; i++) { 2548 exceptions[i] = table[i].class_cp_index; 2549 } 2550 } 2551 JVM_END 2552 2553 2554 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2555 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2556 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2557 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2558 return method->checked_exceptions_length(); 2559 JVM_END 2560 2561 2562 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2563 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2564 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2565 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2566 memcpy(code, method->code_base(), method->code_size()); 2567 JVM_END 2568 2569 2570 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2572 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2573 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2574 return method->code_size(); 2575 JVM_END 2576 2577 2578 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2579 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2580 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2581 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2582 ExceptionTable extable(method); 2583 entry->start_pc = extable.start_pc(entry_index); 2584 entry->end_pc = extable.end_pc(entry_index); 2585 entry->handler_pc = extable.handler_pc(entry_index); 2586 entry->catchType = extable.catch_type_index(entry_index); 2587 JVM_END 2588 2589 2590 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2591 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2592 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2593 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2594 return method->exception_table_length(); 2595 JVM_END 2596 2597 2598 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2599 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2600 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2601 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2602 return method->access_flags().as_method_flags(); 2603 JVM_END 2604 2605 2606 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2607 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2608 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2609 return InstanceKlass::cast(k)->field_access_flags(field_index); 2610 JVM_END 2611 2612 2613 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2614 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2615 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2616 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2617 return method->max_locals(); 2618 JVM_END 2619 2620 2621 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2622 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2623 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2624 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2625 return method->size_of_parameters(); 2626 JVM_END 2627 2628 2629 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2630 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2631 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2632 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2633 return method->verifier_max_stack(); 2634 JVM_END 2635 2636 2637 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2638 ResourceMark rm(THREAD); 2639 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2640 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2641 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2642 return method->is_object_constructor(); 2643 JVM_END 2644 2645 2646 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2647 ResourceMark rm(THREAD); 2648 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2649 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2650 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2651 return method->is_overpass(); 2652 JVM_END 2653 2654 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2655 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2656 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2657 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2658 return method->name()->as_utf8(); 2659 JVM_END 2660 2661 2662 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2663 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2664 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2665 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2666 return method->signature()->as_utf8(); 2667 JVM_END 2668 2669 /** 2670 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2671 * read entries in the constant pool. Since the old verifier always 2672 * works on a copy of the code, it will not see any rewriting that 2673 * may possibly occur in the middle of verification. So it is important 2674 * that nothing it calls tries to use the cpCache instead of the raw 2675 * constant pool, so we must use cp->uncached_x methods when appropriate. 2676 */ 2677 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2678 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2679 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2680 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2681 switch (cp->tag_at(cp_index).value()) { 2682 case JVM_CONSTANT_Fieldref: 2683 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2684 default: 2685 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2686 } 2687 ShouldNotReachHere(); 2688 return nullptr; 2689 JVM_END 2690 2691 2692 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2693 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2694 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2695 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2696 switch (cp->tag_at(cp_index).value()) { 2697 case JVM_CONSTANT_InterfaceMethodref: 2698 case JVM_CONSTANT_Methodref: 2699 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2700 default: 2701 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2702 } 2703 ShouldNotReachHere(); 2704 return nullptr; 2705 JVM_END 2706 2707 2708 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2709 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2710 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2711 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2712 switch (cp->tag_at(cp_index).value()) { 2713 case JVM_CONSTANT_InterfaceMethodref: 2714 case JVM_CONSTANT_Methodref: 2715 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2716 default: 2717 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2718 } 2719 ShouldNotReachHere(); 2720 return nullptr; 2721 JVM_END 2722 2723 2724 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2725 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2726 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2727 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2728 switch (cp->tag_at(cp_index).value()) { 2729 case JVM_CONSTANT_Fieldref: 2730 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2731 default: 2732 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2733 } 2734 ShouldNotReachHere(); 2735 return nullptr; 2736 JVM_END 2737 2738 2739 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2740 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2741 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2742 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2743 Symbol* classname = cp->klass_name_at(cp_index); 2744 return classname->as_utf8(); 2745 JVM_END 2746 2747 2748 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2749 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2750 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2751 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2752 switch (cp->tag_at(cp_index).value()) { 2753 case JVM_CONSTANT_Fieldref: { 2754 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2755 Symbol* classname = cp->klass_name_at(class_index); 2756 return classname->as_utf8(); 2757 } 2758 default: 2759 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2760 } 2761 ShouldNotReachHere(); 2762 return nullptr; 2763 JVM_END 2764 2765 2766 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2767 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2768 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2769 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2770 switch (cp->tag_at(cp_index).value()) { 2771 case JVM_CONSTANT_Methodref: 2772 case JVM_CONSTANT_InterfaceMethodref: { 2773 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2774 Symbol* classname = cp->klass_name_at(class_index); 2775 return classname->as_utf8(); 2776 } 2777 default: 2778 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2779 } 2780 ShouldNotReachHere(); 2781 return nullptr; 2782 JVM_END 2783 2784 2785 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2786 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2787 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2788 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2789 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2790 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2791 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2792 switch (cp->tag_at(cp_index).value()) { 2793 case JVM_CONSTANT_Fieldref: { 2794 Symbol* name = cp->uncached_name_ref_at(cp_index); 2795 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2796 InstanceKlass* ik = InstanceKlass::cast(k_called); 2797 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2798 if (fs.name() == name && fs.signature() == signature) { 2799 return fs.access_flags().as_field_flags(); 2800 } 2801 } 2802 return -1; 2803 } 2804 default: 2805 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2806 } 2807 ShouldNotReachHere(); 2808 return 0; 2809 JVM_END 2810 2811 2812 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2813 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2814 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2815 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2816 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2817 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2818 switch (cp->tag_at(cp_index).value()) { 2819 case JVM_CONSTANT_Methodref: 2820 case JVM_CONSTANT_InterfaceMethodref: { 2821 Symbol* name = cp->uncached_name_ref_at(cp_index); 2822 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2823 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2824 int methods_count = methods->length(); 2825 for (int i = 0; i < methods_count; i++) { 2826 Method* method = methods->at(i); 2827 if (method->name() == name && method->signature() == signature) { 2828 return method->access_flags().as_method_flags(); 2829 } 2830 } 2831 return -1; 2832 } 2833 default: 2834 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2835 } 2836 ShouldNotReachHere(); 2837 return 0; 2838 JVM_END 2839 2840 2841 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2842 2843 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2844 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2845 JVM_END 2846 2847 2848 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2849 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2850 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2851 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2852 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2853 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2854 JVM_END 2855 2856 // Printing support ////////////////////////////////////////////////// 2857 extern "C" { 2858 2859 ATTRIBUTE_PRINTF(3, 0) 2860 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2861 // Reject count values that are negative signed values converted to 2862 // unsigned; see bug 4399518, 4417214 2863 if ((intptr_t)count <= 0) return -1; 2864 2865 int result = os::vsnprintf(str, count, fmt, args); 2866 if (result > 0 && (size_t)result >= count) { 2867 result = -1; 2868 } 2869 2870 return result; 2871 } 2872 2873 ATTRIBUTE_PRINTF(3, 4) 2874 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2875 va_list args; 2876 int len; 2877 va_start(args, fmt); 2878 len = jio_vsnprintf(str, count, fmt, args); 2879 va_end(args); 2880 return len; 2881 } 2882 2883 ATTRIBUTE_PRINTF(2, 3) 2884 int jio_fprintf(FILE* f, const char *fmt, ...) { 2885 int len; 2886 va_list args; 2887 va_start(args, fmt); 2888 len = jio_vfprintf(f, fmt, args); 2889 va_end(args); 2890 return len; 2891 } 2892 2893 ATTRIBUTE_PRINTF(2, 0) 2894 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2895 if (Arguments::vfprintf_hook() != nullptr) { 2896 return Arguments::vfprintf_hook()(f, fmt, args); 2897 } else { 2898 return vfprintf(f, fmt, args); 2899 } 2900 } 2901 2902 ATTRIBUTE_PRINTF(1, 2) 2903 JNIEXPORT int jio_printf(const char *fmt, ...) { 2904 int len; 2905 va_list args; 2906 va_start(args, fmt); 2907 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2908 va_end(args); 2909 return len; 2910 } 2911 2912 // HotSpot specific jio method 2913 void jio_print(const char* s, size_t len) { 2914 // Try to make this function as atomic as possible. 2915 if (Arguments::vfprintf_hook() != nullptr) { 2916 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2917 } else { 2918 // Make an unused local variable to avoid warning from gcc compiler. 2919 bool dummy = os::write(defaultStream::output_fd(), s, len); 2920 } 2921 } 2922 2923 } // Extern C 2924 2925 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2926 2927 // In most of the JVM thread support functions we need to access the 2928 // thread through a ThreadsListHandle to prevent it from exiting and 2929 // being reclaimed while we try to operate on it. The exceptions to this 2930 // rule are when operating on the current thread, or if the monitor of 2931 // the target java.lang.Thread is locked at the Java level - in both 2932 // cases the target cannot exit. 2933 2934 static void thread_entry(JavaThread* thread, TRAPS) { 2935 HandleMark hm(THREAD); 2936 Handle obj(THREAD, thread->threadObj()); 2937 JavaValue result(T_VOID); 2938 JavaCalls::call_virtual(&result, 2939 obj, 2940 vmClasses::Thread_klass(), 2941 vmSymbols::run_method_name(), 2942 vmSymbols::void_method_signature(), 2943 THREAD); 2944 } 2945 2946 2947 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2948 #if INCLUDE_CDS 2949 if (CDSConfig::allow_only_single_java_thread()) { 2950 // During java -Xshare:dump, if we allow multiple Java threads to 2951 // execute in parallel, symbols and classes may be loaded in 2952 // random orders which will make the resulting CDS archive 2953 // non-deterministic. 2954 // 2955 // Lucikly, during java -Xshare:dump, it's important to run only 2956 // the code in the main Java thread (which is NOT started here) that 2957 // creates the module graph, etc. It's safe to not start the other 2958 // threads which are launched by class static initializers 2959 // (ReferenceHandler, FinalizerThread and CleanerImpl). 2960 if (log_is_enabled(Info, cds)) { 2961 ResourceMark rm; 2962 oop t = JNIHandles::resolve_non_null(jthread); 2963 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 2964 } 2965 return; 2966 } 2967 #endif 2968 JavaThread *native_thread = nullptr; 2969 2970 // We cannot hold the Threads_lock when we throw an exception, 2971 // due to rank ordering issues. Example: we might need to grab the 2972 // Heap_lock while we construct the exception. 2973 bool throw_illegal_thread_state = false; 2974 2975 // We must release the Threads_lock before we can post a jvmti event 2976 // in Thread::start. 2977 { 2978 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock); 2979 // Ensure that the C++ Thread and OSThread structures aren't freed before 2980 // we operate. 2981 MutexLocker ml(Threads_lock); 2982 2983 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2984 // re-starting an already started thread, so we should usually find 2985 // that the JavaThread is null. However for a JNI attached thread 2986 // there is a small window between the Thread object being created 2987 // (with its JavaThread set) and the update to its threadStatus, so we 2988 // have to check for this 2989 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 2990 throw_illegal_thread_state = true; 2991 } else { 2992 jlong size = 2993 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2994 // Allocate the C++ Thread structure and create the native thread. The 2995 // stack size retrieved from java is 64-bit signed, but the constructor takes 2996 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2997 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2998 // - Avoid passing negative values which would result in really large stacks. 2999 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 3000 size_t sz = size > 0 ? (size_t) size : 0; 3001 native_thread = new JavaThread(&thread_entry, sz); 3002 3003 // At this point it may be possible that no osthread was created for the 3004 // JavaThread due to lack of memory. Check for this situation and throw 3005 // an exception if necessary. Eventually we may want to change this so 3006 // that we only grab the lock if the thread was created successfully - 3007 // then we can also do this check and throw the exception in the 3008 // JavaThread constructor. 3009 if (native_thread->osthread() != nullptr) { 3010 // Note: the current thread is not being used within "prepare". 3011 native_thread->prepare(jthread); 3012 } 3013 } 3014 } 3015 3016 if (throw_illegal_thread_state) { 3017 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3018 } 3019 3020 assert(native_thread != nullptr, "Starting null thread?"); 3021 3022 if (native_thread->osthread() == nullptr) { 3023 ResourceMark rm(thread); 3024 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 3025 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 3026 // No one should hold a reference to the 'native_thread'. 3027 native_thread->smr_delete(); 3028 if (JvmtiExport::should_post_resource_exhausted()) { 3029 JvmtiExport::post_resource_exhausted( 3030 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3031 os::native_thread_creation_failed_msg()); 3032 } 3033 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3034 os::native_thread_creation_failed_msg()); 3035 } 3036 3037 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3038 3039 Thread::start(native_thread); 3040 3041 JVM_END 3042 3043 3044 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3045 ThreadsListHandle tlh(thread); 3046 oop java_thread = nullptr; 3047 JavaThread* receiver = nullptr; 3048 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3049 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3050 3051 if (is_alive) { 3052 // jthread refers to a live JavaThread. 3053 Thread::set_priority(receiver, (ThreadPriority)prio); 3054 } 3055 // Implied else: If the JavaThread hasn't started yet, then the 3056 // priority set in the java.lang.Thread object above will be pushed 3057 // down when it does start. 3058 JVM_END 3059 3060 3061 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3062 HOTSPOT_THREAD_YIELD(); 3063 os::naked_yield(); 3064 JVM_END 3065 3066 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos)) 3067 if (nanos < 0) { 3068 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range"); 3069 } 3070 3071 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3072 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3073 } 3074 3075 // Save current thread state and restore it at the end of this block. 3076 // And set new thread state to SLEEPING. 3077 JavaThreadSleepState jtss(thread); 3078 3079 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC); 3080 3081 if (nanos == 0) { 3082 os::naked_yield(); 3083 } else { 3084 ThreadState old_state = thread->osthread()->get_state(); 3085 thread->osthread()->set_state(SLEEPING); 3086 if (!thread->sleep_nanos(nanos)) { // interrupted 3087 // An asynchronous exception could have been thrown on 3088 // us while we were sleeping. We do not overwrite those. 3089 if (!HAS_PENDING_EXCEPTION) { 3090 HOTSPOT_THREAD_SLEEP_END(1); 3091 3092 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3093 // to properly restore the thread state. That's likely wrong. 3094 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3095 } 3096 } 3097 thread->osthread()->set_state(old_state); 3098 } 3099 HOTSPOT_THREAD_SLEEP_END(0); 3100 JVM_END 3101 3102 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3103 oop jthread = thread->threadObj(); 3104 assert(jthread != nullptr, "no current carrier thread!"); 3105 return JNIHandles::make_local(THREAD, jthread); 3106 JVM_END 3107 3108 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3109 oop theThread = thread->vthread(); 3110 assert(theThread != (oop)nullptr, "no current thread!"); 3111 return JNIHandles::make_local(THREAD, theThread); 3112 JVM_END 3113 3114 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3115 jobject theThread)) 3116 oop threadObj = JNIHandles::resolve(theThread); 3117 thread->set_vthread(threadObj); 3118 3119 // Set _monitor_owner_id of new current Thread 3120 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj)); 3121 3122 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3123 JVM_END 3124 3125 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3126 return ThreadIdentifier::unsafe_offset(); 3127 JVM_END 3128 3129 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3130 ThreadsListHandle tlh(thread); 3131 JavaThread* receiver = nullptr; 3132 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3133 if (is_alive) { 3134 // jthread refers to a live JavaThread. 3135 receiver->interrupt(); 3136 } 3137 JVM_END 3138 3139 // Return true iff the current thread has locked the object passed in 3140 3141 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3142 if (obj == nullptr) { 3143 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3144 } 3145 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3146 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3147 JVM_END 3148 3149 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3150 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD); 3151 return JNIHandles::make_local(THREAD, trace); 3152 JVM_END 3153 3154 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3155 // We don't use a ThreadsListHandle here because the current thread 3156 // must be alive. 3157 oop java_thread = JNIHandles::resolve_non_null(jthread); 3158 JavaThread* thr = java_lang_Thread::thread(java_thread); 3159 if (thread == thr && !thr->has_attached_via_jni()) { 3160 // Thread naming is only supported for the current thread and 3161 // we don't set the name of an attached thread to avoid stepping 3162 // on other programs. 3163 ResourceMark rm(thread); 3164 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3165 os::set_native_thread_name(thread_name); 3166 } 3167 JVM_END 3168 3169 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3170 oop theCache = thread->scopedValueCache(); 3171 return JNIHandles::make_local(THREAD, theCache); 3172 JVM_END 3173 3174 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3175 jobject theCache)) 3176 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3177 thread->set_scopedValueCache(objs); 3178 JVM_END 3179 3180 3181 // java.lang.Package //////////////////////////////////////////////////////////////// 3182 3183 3184 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3185 ResourceMark rm(THREAD); 3186 JvmtiVMObjectAllocEventCollector oam; 3187 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3188 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3189 return (jstring) JNIHandles::make_local(THREAD, result); 3190 JVM_END 3191 3192 3193 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3194 JvmtiVMObjectAllocEventCollector oam; 3195 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3196 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3197 JVM_END 3198 3199 3200 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3201 3202 3203 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3204 MonitorLocker ml(Heap_lock); 3205 oop ref = Universe::reference_pending_list(); 3206 if (ref != nullptr) { 3207 Universe::clear_reference_pending_list(); 3208 } 3209 return JNIHandles::make_local(THREAD, ref); 3210 JVM_END 3211 3212 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3213 MonitorLocker ml(Heap_lock); 3214 return Universe::has_reference_pending_list(); 3215 JVM_END 3216 3217 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3218 MonitorLocker ml(Heap_lock); 3219 while (!Universe::has_reference_pending_list()) { 3220 ml.wait(); 3221 } 3222 JVM_END 3223 3224 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3225 oop ref_oop = JNIHandles::resolve_non_null(ref); 3226 // PhantomReference has it's own implementation of refersTo(). 3227 // See: JVM_PhantomReferenceRefersTo 3228 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3229 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3230 return referent == JNIHandles::resolve(o); 3231 JVM_END 3232 3233 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3234 oop ref_oop = JNIHandles::resolve_non_null(ref); 3235 // FinalReference has it's own implementation of clear(). 3236 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3237 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3238 // If the referent has already been cleared then done. 3239 // However, if the referent is dead but has not yet been cleared by 3240 // concurrent reference processing, it should NOT be cleared here. 3241 // Instead, clearing should be left to the GC. Clearing it here could 3242 // detectably lose an expected notification, which is impossible with 3243 // STW reference processing. The clearing in enqueue() doesn't have 3244 // this problem, since the enqueue covers the notification, but it's not 3245 // worth the effort to handle that case specially. 3246 return; 3247 } 3248 java_lang_ref_Reference::clear_referent(ref_oop); 3249 JVM_END 3250 3251 3252 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3253 3254 3255 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3256 oop ref_oop = JNIHandles::resolve_non_null(ref); 3257 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3258 return referent == JNIHandles::resolve(o); 3259 JVM_END 3260 3261 3262 // ObjectInputStream /////////////////////////////////////////////////////////////// 3263 3264 // Return the first user-defined class loader up the execution stack, or null 3265 // if only code from the bootstrap or platform class loader is on the stack. 3266 3267 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3268 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3269 InstanceKlass* ik = vfst.method()->method_holder(); 3270 oop loader = ik->class_loader(); 3271 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3272 return JNIHandles::make_local(THREAD, loader); 3273 } 3274 } 3275 return nullptr; 3276 JVM_END 3277 3278 3279 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3280 3281 3282 // resolve array handle and check arguments 3283 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3284 if (arr == nullptr) { 3285 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3286 } 3287 oop a = JNIHandles::resolve_non_null(arr); 3288 if (!a->is_array()) { 3289 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3290 } else if (type_array_only && !a->is_typeArray()) { 3291 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3292 } 3293 return arrayOop(a); 3294 } 3295 3296 3297 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3298 arrayOop a = check_array(env, arr, false, CHECK_0); 3299 return a->length(); 3300 JVM_END 3301 3302 3303 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3304 JvmtiVMObjectAllocEventCollector oam; 3305 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3306 jvalue value; 3307 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3308 oop box = Reflection::box(&value, type, CHECK_NULL); 3309 return JNIHandles::make_local(THREAD, box); 3310 JVM_END 3311 3312 3313 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3314 jvalue value; 3315 value.i = 0; // to initialize value before getting used in CHECK 3316 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3317 assert(a->is_typeArray(), "just checking"); 3318 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3319 BasicType wide_type = (BasicType) wCode; 3320 if (type != wide_type) { 3321 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3322 } 3323 return value; 3324 JVM_END 3325 3326 3327 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3328 arrayOop a = check_array(env, arr, false, CHECK); 3329 oop box = JNIHandles::resolve(val); 3330 jvalue value; 3331 value.i = 0; // to initialize value before getting used in CHECK 3332 BasicType value_type; 3333 if (a->is_objArray()) { 3334 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3335 value_type = Reflection::unbox_for_regular_object(box, &value); 3336 } else { 3337 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3338 } 3339 Reflection::array_set(&value, a, index, value_type, CHECK); 3340 JVM_END 3341 3342 3343 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3344 arrayOop a = check_array(env, arr, true, CHECK); 3345 assert(a->is_typeArray(), "just checking"); 3346 BasicType value_type = (BasicType) vCode; 3347 Reflection::array_set(&v, a, index, value_type, CHECK); 3348 JVM_END 3349 3350 3351 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3352 JvmtiVMObjectAllocEventCollector oam; 3353 oop element_mirror = JNIHandles::resolve(eltClass); 3354 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3355 return JNIHandles::make_local(THREAD, result); 3356 JVM_END 3357 3358 3359 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3360 JvmtiVMObjectAllocEventCollector oam; 3361 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3362 oop element_mirror = JNIHandles::resolve(eltClass); 3363 assert(dim_array->is_typeArray(), "just checking"); 3364 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3365 return JNIHandles::make_local(THREAD, result); 3366 JVM_END 3367 3368 3369 // Library support /////////////////////////////////////////////////////////////////////////// 3370 3371 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3372 return ZipLibrary::handle(); 3373 JVM_END 3374 3375 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3376 //%note jvm_ct 3377 char ebuf[1024]; 3378 void *load_result; 3379 { 3380 ThreadToNativeFromVM ttnfvm(thread); 3381 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3382 } 3383 if (load_result == nullptr) { 3384 if (throwException) { 3385 char msg[1024]; 3386 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3387 // Since 'ebuf' may contain a string encoded using 3388 // platform encoding scheme, we need to pass 3389 // Exceptions::unsafe_to_utf8 to the new_exception method 3390 // as the last argument. See bug 6367357. 3391 Handle h_exception = 3392 Exceptions::new_exception(thread, 3393 vmSymbols::java_lang_UnsatisfiedLinkError(), 3394 msg, Exceptions::unsafe_to_utf8); 3395 3396 THROW_HANDLE_NULL(h_exception); 3397 } else { 3398 log_info(library)("Failed to load library %s", name); 3399 return load_result; 3400 } 3401 } 3402 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3403 return load_result; 3404 JVM_END 3405 3406 3407 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3408 os::dll_unload(handle); 3409 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3410 JVM_END 3411 3412 3413 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3414 void* find_result = os::dll_lookup(handle, name); 3415 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3416 find_result != nullptr ? "Found" : "Failed to find", 3417 name, p2i(handle)); 3418 return find_result; 3419 JVM_END 3420 3421 3422 // JNI version /////////////////////////////////////////////////////////////////////////////// 3423 3424 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3425 return Threads::is_supported_jni_version_including_1_1(version); 3426 JVM_END 3427 3428 3429 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3430 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3431 JVM_END 3432 3433 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void)) 3434 return EnableValhalla ? JNI_TRUE : JNI_FALSE; 3435 JVM_END 3436 3437 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3438 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3439 JVM_END 3440 3441 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void)) 3442 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE; 3443 JVM_END 3444 3445 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void)) 3446 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE; 3447 JVM_END 3448 3449 // String support /////////////////////////////////////////////////////////////////////////// 3450 3451 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3452 JvmtiVMObjectAllocEventCollector oam; 3453 if (str == nullptr) return nullptr; 3454 oop string = JNIHandles::resolve_non_null(str); 3455 oop result = StringTable::intern(string, CHECK_NULL); 3456 return (jstring) JNIHandles::make_local(THREAD, result); 3457 JVM_END 3458 3459 3460 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3461 3462 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3463 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3464 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3465 // in the safepoint protocol, thread suspension, thread interruption, or most things of that 3466 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has 3467 // shutdown. JavaThreads will be "in native" when using this API from JDK code. 3468 3469 3470 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3471 VM_Exit::block_if_vm_exited(); 3472 return new PlatformMutex(); 3473 } 3474 3475 3476 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3477 VM_Exit::block_if_vm_exited(); 3478 delete ((PlatformMutex*) mon); 3479 } 3480 3481 3482 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3483 VM_Exit::block_if_vm_exited(); 3484 ((PlatformMutex*) mon)->lock(); 3485 return 0; 3486 } 3487 3488 3489 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3490 VM_Exit::block_if_vm_exited(); 3491 ((PlatformMutex*) mon)->unlock(); 3492 } 3493 3494 3495 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3496 3497 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3498 Handle loader, jboolean throwError, TRAPS) { 3499 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL); 3500 3501 // Check if we should initialize the class 3502 if (init && klass->is_instance_klass()) { 3503 klass->initialize(CHECK_NULL); 3504 } 3505 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3506 } 3507 3508 3509 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3510 3511 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3512 Handle method_handle; 3513 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3514 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3515 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3516 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3517 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???"); 3518 3519 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3520 jobject res = JNIHandles::make_local(THREAD, result); 3521 if (JvmtiExport::should_post_vm_object_alloc()) { 3522 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3523 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3524 if (java_lang_Class::is_primitive(ret_type)) { 3525 // Only for primitive type vm allocates memory for java object. 3526 // See box() method. 3527 JvmtiExport::post_vm_object_alloc(thread, result); 3528 } 3529 } 3530 return res; 3531 } else { 3532 THROW_NULL(vmSymbols::java_lang_StackOverflowError()); 3533 } 3534 JVM_END 3535 3536 3537 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3538 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3539 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???"); 3540 oop constructor_mirror = JNIHandles::resolve(c); 3541 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3542 jobject res = JNIHandles::make_local(THREAD, result); 3543 if (JvmtiExport::should_post_vm_object_alloc()) { 3544 JvmtiExport::post_vm_object_alloc(thread, result); 3545 } 3546 return res; 3547 JVM_END 3548 3549 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3550 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3551 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3552 JVM_END 3553 3554 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3555 jclass caller, 3556 jstring interfaceMethodName, 3557 jobject factoryType, 3558 jobject interfaceMethodType, 3559 jobject implementationMember, 3560 jobject dynamicMethodType, 3561 jclass lambdaProxyClass)) 3562 #if INCLUDE_CDS 3563 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) { 3564 return; 3565 } 3566 3567 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3568 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3569 if (caller_ik->is_hidden()) { 3570 // Hidden classes not of type lambda proxy classes are currently not being archived. 3571 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3572 // registered for archiving. 3573 return; 3574 } 3575 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass)); 3576 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k); 3577 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3578 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3579 3580 Symbol* interface_method_name = nullptr; 3581 if (interfaceMethodName != nullptr) { 3582 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3583 } 3584 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3585 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3586 3587 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3588 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3589 3590 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3591 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3592 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3593 3594 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3595 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3596 3597 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3598 interface_method_type, m, dynamic_method_type, THREAD); 3599 #endif // INCLUDE_CDS 3600 JVM_END 3601 3602 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3603 jclass caller, 3604 jstring interfaceMethodName, 3605 jobject factoryType, 3606 jobject interfaceMethodType, 3607 jobject implementationMember, 3608 jobject dynamicMethodType)) 3609 #if INCLUDE_CDS 3610 3611 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3612 implementationMember == nullptr || dynamicMethodType == nullptr) { 3613 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3614 } 3615 3616 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3617 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3618 if (!caller_ik->is_shared()) { 3619 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3620 return nullptr; 3621 } 3622 3623 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3624 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3625 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3626 3627 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3628 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3629 3630 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3631 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3632 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3633 3634 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3635 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3636 3637 InstanceKlass* loaded_lambda = 3638 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3639 interface_method_type, m, dynamic_method_type, 3640 CHECK_(nullptr)); 3641 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3642 #else 3643 return nullptr; 3644 #endif // INCLUDE_CDS 3645 JVM_END 3646 3647 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3648 if (CDSConfig::is_dumping_static_archive()) { 3649 // We do this so that the default CDS archive can be deterministic. 3650 const char* release = VM_Version::vm_release(); 3651 const char* dbg_level = VM_Version::jdk_debug_level(); 3652 const char* version = VM_Version::internal_vm_info_string(); 3653 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3654 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3655 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3656 seed += (jlong)VM_Version::vm_major_version(); 3657 seed += (jlong)VM_Version::vm_minor_version(); 3658 seed += (jlong)VM_Version::vm_security_version(); 3659 seed += (jlong)VM_Version::vm_patch_version(); 3660 if (seed == 0) { // don't let this ever be zero. 3661 seed = 0x87654321; 3662 } 3663 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3664 return seed; 3665 } else { 3666 return 0; 3667 } 3668 JVM_END 3669 3670 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus()) 3671 return CDSConfig::get_status(); 3672 JVM_END 3673 3674 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3675 #if INCLUDE_CDS 3676 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity"); 3677 if (line != nullptr) { 3678 ResourceMark rm(THREAD); 3679 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3680 char* c_line = java_lang_String::as_utf8_string(h_line()); 3681 if (CDSConfig::is_dumping_dynamic_archive()) { 3682 // Note: LambdaFormInvokers::append take same format which is not 3683 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3684 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3685 } 3686 if (ClassListWriter::is_enabled()) { 3687 ClassListWriter w; 3688 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line); 3689 } 3690 } 3691 #endif // INCLUDE_CDS 3692 JVM_END 3693 3694 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3695 #if INCLUDE_CDS 3696 ResourceMark rm(THREAD); 3697 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3698 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3699 MetaspaceShared::dump_loaded_classes(file_name, THREAD); 3700 #endif // INCLUDE_CDS 3701 JVM_END 3702 3703 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3704 #if INCLUDE_CDS 3705 ResourceMark rm(THREAD); 3706 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3707 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3708 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3709 #endif // INCLUDE_CDS 3710 JVM_END 3711 3712 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls)) 3713 #if INCLUDE_CDS 3714 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3715 if (!k->is_instance_klass()) { 3716 return false; 3717 } else { 3718 if (InstanceKlass::cast(k)->is_enum_subclass() || 3719 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) { 3720 // This class will be cached in AOT-initialized state. No need for init barriers. 3721 return false; 3722 } else { 3723 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles 3724 // must emit barriers to ensure class initialization during production run. 3725 ResourceMark rm(THREAD); 3726 log_debug(cds)("NeedsClassInitBarrierForCDS: %s", k->external_name()); 3727 return true; 3728 } 3729 } 3730 #else 3731 return false; 3732 #endif // INCLUDE_CDS 3733 JVM_END 3734 3735 // Returns an array of all live Thread objects (VM internal JavaThreads, 3736 // jvmti agent threads, and JNI attaching threads are skipped) 3737 // See CR 6404306 regarding JNI attaching threads 3738 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3739 ResourceMark rm(THREAD); 3740 ThreadsListEnumerator tle(THREAD, false, false); 3741 JvmtiVMObjectAllocEventCollector oam; 3742 3743 int num_threads = tle.num_threads(); 3744 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3745 objArrayHandle threads_ah(THREAD, r); 3746 3747 for (int i = 0; i < num_threads; i++) { 3748 Handle h = tle.get_threadObj(i); 3749 threads_ah->obj_at_put(i, h()); 3750 } 3751 3752 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3753 JVM_END 3754 3755 3756 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3757 // Return StackTraceElement[][], each element is the stack trace of a thread in 3758 // the corresponding entry in the given threads array 3759 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3760 JvmtiVMObjectAllocEventCollector oam; 3761 3762 // Check if threads is null 3763 if (threads == nullptr) { 3764 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3765 } 3766 3767 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3768 objArrayHandle ah(THREAD, a); 3769 int num_threads = ah->length(); 3770 // check if threads is non-empty array 3771 if (num_threads == 0) { 3772 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3773 } 3774 3775 // check if threads is not an array of objects of Thread class 3776 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3777 if (k != vmClasses::Thread_klass()) { 3778 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3779 } 3780 3781 ResourceMark rm(THREAD); 3782 3783 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3784 for (int i = 0; i < num_threads; i++) { 3785 oop thread_obj = ah->obj_at(i); 3786 instanceHandle h(THREAD, (instanceOop) thread_obj); 3787 thread_handle_array->append(h); 3788 } 3789 3790 // The JavaThread references in thread_handle_array are validated 3791 // in VM_ThreadDump::doit(). 3792 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3793 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3794 3795 JVM_END 3796 3797 // JVM monitoring and management support 3798 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3799 return Management::get_jmm_interface(version); 3800 JVM_END 3801 3802 // com.sun.tools.attach.VirtualMachine agent properties support 3803 // 3804 // Initialize the agent properties with the properties maintained in the VM 3805 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3806 ResourceMark rm; 3807 3808 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3809 3810 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3811 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3812 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3813 return properties; 3814 JVM_END 3815 3816 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3817 { 3818 JvmtiVMObjectAllocEventCollector oam; 3819 3820 if (ofClass == nullptr) { 3821 return nullptr; 3822 } 3823 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3824 // Special handling for primitive objects 3825 if (java_lang_Class::is_primitive(mirror())) { 3826 return nullptr; 3827 } 3828 Klass* k = java_lang_Class::as_Klass(mirror()); 3829 if (!k->is_instance_klass()) { 3830 return nullptr; 3831 } 3832 InstanceKlass* ik = InstanceKlass::cast(k); 3833 int encl_method_class_idx = ik->enclosing_method_class_index(); 3834 if (encl_method_class_idx == 0) { 3835 return nullptr; 3836 } 3837 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3838 objArrayHandle dest(THREAD, dest_o); 3839 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3840 dest->obj_at_put(0, enc_k->java_mirror()); 3841 int encl_method_method_idx = ik->enclosing_method_method_index(); 3842 if (encl_method_method_idx != 0) { 3843 Symbol* sym = ik->constants()->symbol_at( 3844 extract_low_short_from_int( 3845 ik->constants()->name_and_type_at(encl_method_method_idx))); 3846 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3847 dest->obj_at_put(1, str()); 3848 sym = ik->constants()->symbol_at( 3849 extract_high_short_from_int( 3850 ik->constants()->name_and_type_at(encl_method_method_idx))); 3851 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3852 dest->obj_at_put(2, str()); 3853 } 3854 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3855 } 3856 JVM_END 3857 3858 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3859 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3860 ResourceMark rm(THREAD); 3861 3862 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3863 return nullptr; 3864 } 3865 3866 char** vm_flags = Arguments::jvm_flags_array(); 3867 char** vm_args = Arguments::jvm_args_array(); 3868 int num_flags = Arguments::num_jvm_flags(); 3869 int num_args = Arguments::num_jvm_args(); 3870 3871 InstanceKlass* ik = vmClasses::String_klass(); 3872 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3873 objArrayHandle result_h(THREAD, r); 3874 3875 int index = 0; 3876 for (int j = 0; j < num_flags; j++, index++) { 3877 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3878 result_h->obj_at_put(index, h()); 3879 } 3880 for (int i = 0; i < num_args; i++, index++) { 3881 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3882 result_h->obj_at_put(index, h()); 3883 } 3884 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 3885 JVM_END 3886 3887 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 3888 return os::get_signal_number(name); 3889 JVM_END 3890 3891 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread)) 3892 #if INCLUDE_JVMTI 3893 if (!DoJVMTIVirtualThreadTransitions) { 3894 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3895 return; 3896 } 3897 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3898 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread); 3899 } else { 3900 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3901 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false); 3902 } 3903 #endif 3904 JVM_END 3905 3906 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread)) 3907 #if INCLUDE_JVMTI 3908 if (!DoJVMTIVirtualThreadTransitions) { 3909 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3910 return; 3911 } 3912 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3913 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread); 3914 } else { 3915 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3916 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true); 3917 } 3918 #endif 3919 JVM_END 3920 3921 // If notifications are disabled then just update the VTMS transition bit and return. 3922 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call. 3923 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide)) 3924 #if INCLUDE_JVMTI 3925 if (!DoJVMTIVirtualThreadTransitions) { 3926 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3927 return; 3928 } 3929 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3930 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide); 3931 } else { 3932 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3933 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 3934 } 3935 #endif 3936 JVM_END 3937 3938 // If notifications are disabled then just update the VTMS transition bit and return. 3939 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below. 3940 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide)) 3941 #if INCLUDE_JVMTI 3942 if (!DoJVMTIVirtualThreadTransitions) { 3943 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3944 return; 3945 } 3946 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3947 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide); 3948 } else { 3949 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3950 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 3951 } 3952 #endif 3953 JVM_END 3954 3955 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section. 3956 // Needed to avoid deadlocks with JVMTI suspend mechanism. 3957 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter)) 3958 #if INCLUDE_JVMTI 3959 if (!DoJVMTIVirtualThreadTransitions) { 3960 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3961 return; 3962 } 3963 assert(thread->is_disable_suspend() != (bool)enter, 3964 "nested or unbalanced monitor enter/exit is not allowed"); 3965 thread->toggle_is_disable_suspend(); 3966 #endif 3967 JVM_END 3968 3969 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op)) 3970 #if INCLUDE_JFR 3971 freeze_result result = THREAD->last_freeze_fail_result(); 3972 assert(result != freeze_ok, "sanity check"); 3973 EventVirtualThreadPinned event(UNTIMED); 3974 event.set_starttime(THREAD->last_freeze_fail_time()); 3975 if (event.should_commit()) { 3976 ResourceMark rm(THREAD); 3977 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op)); 3978 THREAD->post_vthread_pinned_event(&event, str, result); 3979 } 3980 #endif 3981 JVM_END 3982 3983 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored)) 3984 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent(); 3985 assert(parkEvent != nullptr, "not initialized"); 3986 3987 OopHandle& list_head = ObjectMonitor::vthread_list_head(); 3988 oop vthread_head = nullptr; 3989 while (true) { 3990 if (list_head.peek() != nullptr) { 3991 for (;;) { 3992 oop head = list_head.resolve(); 3993 if (list_head.cmpxchg(head, nullptr) == head) { 3994 return JNIHandles::make_local(THREAD, head); 3995 } 3996 } 3997 } 3998 ThreadBlockInVM tbivm(THREAD); 3999 parkEvent->park(); 4000 } 4001 JVM_END 4002 /* 4003 * Return the current class's class file version. The low order 16 bits of the 4004 * returned jint contain the class's major version. The high order 16 bits 4005 * contain the class's minor version. 4006 */ 4007 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 4008 oop mirror = JNIHandles::resolve_non_null(current); 4009 if (java_lang_Class::is_primitive(mirror)) { 4010 // return latest major version and minor version of 0. 4011 return JVM_CLASSFILE_MAJOR_VERSION; 4012 } 4013 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class"); 4014 4015 Klass* c = java_lang_Class::as_Klass(mirror); 4016 assert(c->is_instance_klass(), "must be"); 4017 InstanceKlass* ik = InstanceKlass::cast(c); 4018 return (ik->minor_version() << 16) | ik->major_version(); 4019 JVM_END 4020 4021 /* 4022 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 4023 * get the value will see a materialized value and not a scalar-replaced 4024 * null value. 4025 */ 4026 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 4027 JVM_EnsureMaterializedForStackWalk(env, value); 4028 JVM_END 4029 4030 /* 4031 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded. 4032 */ 4033 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void)) 4034 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE; 4035 JVM_END