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/cdsConfig.hpp" 26 #include "cds/classListParser.hpp" 27 #include "cds/classListWriter.hpp" 28 #include "cds/dynamicArchive.hpp" 29 #include "cds/heapShared.hpp" 30 #include "cds/lambdaFormInvokers.hpp" 31 #include "classfile/classFileStream.hpp" 32 #include "classfile/classLoader.inline.hpp" 33 #include "classfile/classLoaderData.hpp" 34 #include "classfile/classLoaderData.inline.hpp" 35 #include "classfile/classLoadInfo.hpp" 36 #include "classfile/javaAssertions.hpp" 37 #include "classfile/javaClasses.inline.hpp" 38 #include "classfile/moduleEntry.hpp" 39 #include "classfile/modules.hpp" 40 #include "classfile/packageEntry.hpp" 41 #include "classfile/stringTable.hpp" 42 #include "classfile/symbolTable.hpp" 43 #include "classfile/systemDictionary.hpp" 44 #include "classfile/vmClasses.hpp" 45 #include "classfile/vmSymbols.hpp" 46 #include "gc/shared/collectedHeap.inline.hpp" 47 #include "interpreter/bytecode.hpp" 48 #include "interpreter/bytecodeUtils.hpp" 49 #include "jfr/jfrEvents.hpp" 50 #include "jvm.h" 51 #include "logging/log.hpp" 52 #include "memory/oopFactory.hpp" 53 #include "memory/referenceType.hpp" 54 #include "memory/resourceArea.hpp" 55 #include "memory/universe.hpp" 56 #include "oops/access.inline.hpp" 57 #include "oops/constantPool.hpp" 58 #include "oops/fieldStreams.inline.hpp" 59 #include "oops/flatArrayKlass.hpp" 60 #include "oops/instanceKlass.hpp" 61 #include "oops/klass.inline.hpp" 62 #include "oops/method.hpp" 63 #include "oops/recordComponent.hpp" 64 #include "oops/objArrayKlass.hpp" 65 #include "oops/objArrayOop.inline.hpp" 66 #include "oops/oop.inline.hpp" 67 #include "prims/foreignGlobals.hpp" 68 #include "prims/jvm_misc.hpp" 69 #include "prims/jvmtiExport.hpp" 70 #include "prims/jvmtiThreadState.inline.hpp" 71 #include "prims/stackwalk.hpp" 72 #include "runtime/arguments.hpp" 73 #include "runtime/atomic.hpp" 74 #include "runtime/continuation.hpp" 75 #include "runtime/globals_extension.hpp" 76 #include "runtime/handles.inline.hpp" 77 #include "runtime/init.hpp" 78 #include "runtime/interfaceSupport.inline.hpp" 79 #include "runtime/deoptimization.hpp" 80 #include "runtime/handshake.hpp" 81 #include "runtime/java.hpp" 82 #include "runtime/javaCalls.hpp" 83 #include "runtime/javaThread.hpp" 84 #include "runtime/jfieldIDWorkaround.hpp" 85 #include "runtime/jniHandles.inline.hpp" 86 #include "runtime/os.inline.hpp" 87 #include "runtime/osThread.hpp" 88 #include "runtime/perfData.hpp" 89 #include "runtime/reflection.hpp" 90 #include "runtime/synchronizer.hpp" 91 #include "runtime/threadIdentifier.hpp" 92 #include "runtime/threadSMR.hpp" 93 #include "runtime/vframe.inline.hpp" 94 #include "runtime/vmOperations.hpp" 95 #include "runtime/vm_version.hpp" 96 #include "services/attachListener.hpp" 97 #include "services/management.hpp" 98 #include "services/threadService.hpp" 99 #include "utilities/checkedCast.hpp" 100 #include "utilities/copy.hpp" 101 #include "utilities/defaultStream.hpp" 102 #include "utilities/dtrace.hpp" 103 #include "utilities/events.hpp" 104 #include "utilities/macros.hpp" 105 #include "utilities/utf8.hpp" 106 #include "utilities/zipLibrary.hpp" 107 #if INCLUDE_CDS 108 #include "classfile/systemDictionaryShared.hpp" 109 #endif 110 #if INCLUDE_JFR 111 #include "jfr/jfr.hpp" 112 #endif 113 #if INCLUDE_MANAGEMENT 114 #include "services/finalizerService.hpp" 115 #endif 116 #ifdef LINUX 117 #include "osContainer_linux.hpp" 118 #endif 119 120 #include <errno.h> 121 122 /* 123 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 124 such ctors and calls MUST NOT come between an oop declaration/init and its 125 usage because if objects are move this may cause various memory stomps, bus 126 errors and segfaults. Here is a cookbook for causing so called "naked oop 127 failures": 128 129 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 130 // Object address to be held directly in mirror & not visible to GC 131 oop mirror = JNIHandles::resolve_non_null(ofClass); 132 133 // If this ctor can hit a safepoint, moving objects around, then 134 ComplexConstructor foo; 135 136 // Boom! mirror may point to JUNK instead of the intended object 137 (some dereference of mirror) 138 139 // Here's another call that may block for GC, making mirror stale 140 MutexLocker ml(some_lock); 141 142 // And here's an initializer that can result in a stale oop 143 // all in one step. 144 oop o = call_that_can_throw_exception(TRAPS); 145 146 147 The solution is to keep the oop declaration BELOW the ctor or function 148 call that might cause a GC, do another resolve to reassign the oop, or 149 consider use of a Handle instead of an oop so there is immunity from object 150 motion. But note that the "QUICK" entries below do not have a handlemark 151 and thus can only support use of handles passed in. 152 */ 153 154 extern void trace_class_resolution(Klass* to_class) { 155 ResourceMark rm; 156 int line_number = -1; 157 const char * source_file = nullptr; 158 const char * trace = "explicit"; 159 InstanceKlass* caller = nullptr; 160 JavaThread* jthread = JavaThread::current(); 161 if (jthread->has_last_Java_frame()) { 162 vframeStream vfst(jthread); 163 164 // Scan up the stack skipping ClassLoader frames. 165 Method* last_caller = nullptr; 166 167 while (!vfst.at_end()) { 168 Method* m = vfst.method(); 169 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) { 170 break; 171 } 172 last_caller = m; 173 vfst.next(); 174 } 175 // if this is called from Class.forName0 and that is called from Class.forName, 176 // then print the caller of Class.forName. If this is Class.loadClass, then print 177 // that caller, otherwise keep quiet since this should be picked up elsewhere. 178 bool found_it = false; 179 if (!vfst.at_end() && 180 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 181 vfst.method()->name() == vmSymbols::forName0_name()) { 182 vfst.next(); 183 if (!vfst.at_end() && 184 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 185 vfst.method()->name() == vmSymbols::forName_name()) { 186 vfst.next(); 187 found_it = true; 188 } 189 } else if (last_caller != nullptr && 190 last_caller->method_holder()->name() == 191 vmSymbols::java_lang_ClassLoader() && 192 last_caller->name() == vmSymbols::loadClass_name()) { 193 found_it = true; 194 } else if (!vfst.at_end()) { 195 if (vfst.method()->is_native()) { 196 // JNI call 197 found_it = true; 198 } 199 } 200 if (found_it && !vfst.at_end()) { 201 // found the caller 202 caller = vfst.method()->method_holder(); 203 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 204 if (line_number == -1) { 205 // show method name if it's a native method 206 trace = vfst.method()->name_and_sig_as_C_string(); 207 } 208 Symbol* s = caller->source_file_name(); 209 if (s != nullptr) { 210 source_file = s->as_C_string(); 211 } 212 } 213 } 214 if (caller != nullptr) { 215 if (to_class != caller) { 216 const char * from = caller->external_name(); 217 const char * to = to_class->external_name(); 218 // print in a single call to reduce interleaving between threads 219 if (source_file != nullptr) { 220 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 221 } else { 222 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 223 } 224 } 225 } 226 } 227 228 // java.lang.System ////////////////////////////////////////////////////////////////////// 229 230 231 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 232 return os::javaTimeMillis(); 233 JVM_END 234 235 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 236 return os::javaTimeNanos(); 237 JVM_END 238 239 // The function below is actually exposed by jdk.internal.misc.VM and not 240 // java.lang.System, but we choose to keep it here so that it stays next 241 // to JVM_CurrentTimeMillis and JVM_NanoTime 242 243 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 244 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 245 246 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 247 jlong seconds; 248 jlong nanos; 249 250 os::javaTimeSystemUTC(seconds, nanos); 251 252 // We're going to verify that the result can fit in a long. 253 // For that we need the difference in seconds between 'seconds' 254 // and 'offset_secs' to be such that: 255 // |seconds - offset_secs| < (2^63/10^9) 256 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 257 // which makes |seconds - offset_secs| < 2^33 258 // and we will prefer +/- 2^32 as the maximum acceptable diff 259 // as 2^32 has a more natural feel than 2^33... 260 // 261 // So if |seconds - offset_secs| >= 2^32 - we return a special 262 // sentinel value (-1) which the caller should take as an 263 // exception value indicating that the offset given to us is 264 // too far from range of the current time - leading to too big 265 // a nano adjustment. The caller is expected to recover by 266 // computing a more accurate offset and calling this method 267 // again. (For the record 2^32 secs is ~136 years, so that 268 // should rarely happen) 269 // 270 jlong diff = seconds - offset_secs; 271 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 272 return -1; // sentinel value: the offset is too far off the target 273 } 274 275 // return the adjustment. If you compute a time by adding 276 // this number of nanoseconds along with the number of seconds 277 // in the offset you should get the current UTC time. 278 return (diff * (jlong)1000000000) + nanos; 279 JVM_END 280 281 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 282 jobject dst, jint dst_pos, jint length)) 283 // Check if we have null pointers 284 if (src == nullptr || dst == nullptr) { 285 THROW(vmSymbols::java_lang_NullPointerException()); 286 } 287 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 288 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 289 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 290 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 291 // Do copy 292 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 293 JVM_END 294 295 296 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 297 JavaValue r(T_OBJECT); 298 // public synchronized Object put(Object key, Object value); 299 HandleMark hm(THREAD); 300 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 301 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK); 302 JavaCalls::call_virtual(&r, 303 props, 304 vmClasses::Properties_klass(), 305 vmSymbols::put_name(), 306 vmSymbols::object_object_object_signature(), 307 key_str, 308 value_str, 309 THREAD); 310 } 311 312 313 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 314 315 /* 316 * Return all of the system properties in a Java String array with alternating 317 * names and values from the jvm SystemProperty. 318 * Which includes some internal and all commandline -D defined properties. 319 */ 320 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 321 ResourceMark rm(THREAD); 322 HandleMark hm(THREAD); 323 int ndx = 0; 324 int fixedCount = 2; 325 326 SystemProperty* p = Arguments::system_properties(); 327 int count = Arguments::PropertyList_count(p); 328 329 // Allocate result String array 330 InstanceKlass* ik = vmClasses::String_klass(); 331 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 332 objArrayHandle result_h(THREAD, r); 333 334 while (p != nullptr) { 335 const char * key = p->key(); 336 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 337 const char * value = p->value(); 338 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 339 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL); 340 result_h->obj_at_put(ndx * 2, key_str()); 341 result_h->obj_at_put(ndx * 2 + 1, value_str()); 342 ndx++; 343 } 344 p = p->next(); 345 } 346 347 // Convert the -XX:MaxDirectMemorySize= command line flag 348 // to the sun.nio.MaxDirectMemorySize property. 349 // Do this after setting user properties to prevent people 350 // from setting the value with a -D option, as requested. 351 // Leave empty if not supplied 352 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 353 char as_chars[256]; 354 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 355 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 356 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 357 result_h->obj_at_put(ndx * 2, key_str()); 358 result_h->obj_at_put(ndx * 2 + 1, value_str()); 359 ndx++; 360 } 361 362 // JVM monitoring and management support 363 // Add the sun.management.compiler property for the compiler's name 364 { 365 #undef CSIZE 366 #if defined(_LP64) 367 #define CSIZE "64-Bit " 368 #else 369 #define CSIZE 370 #endif // 64bit 371 372 #if COMPILER1_AND_COMPILER2 373 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 374 #else 375 #if defined(COMPILER1) 376 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 377 #elif defined(COMPILER2) 378 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 379 #elif INCLUDE_JVMCI 380 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2" 381 #else 382 const char* compiler_name = ""; 383 #endif // compilers 384 #endif // COMPILER1_AND_COMPILER2 385 386 if (*compiler_name != '\0' && 387 (Arguments::mode() != Arguments::_int)) { 388 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 389 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 390 result_h->obj_at_put(ndx * 2, key_str()); 391 result_h->obj_at_put(ndx * 2 + 1, value_str()); 392 ndx++; 393 } 394 } 395 396 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 397 JVM_END 398 399 400 /* 401 * Return the temporary directory that the VM uses for the attach 402 * and perf data files. 403 * 404 * It is important that this directory is well-known and the 405 * same for all VM instances. It cannot be affected by configuration 406 * variables such as java.io.tmpdir. 407 */ 408 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 409 HandleMark hm(THREAD); 410 const char* temp_dir = os::get_temp_directory(); 411 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 412 return (jstring) JNIHandles::make_local(THREAD, h()); 413 JVM_END 414 415 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) { 416 if (len < 0) { 417 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative"); 418 } 419 elmClass->initialize(CHECK); 420 if (elmClass->is_identity_class()) { 421 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class"); 422 } 423 if (elmClass->is_abstract()) { 424 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract"); 425 } 426 } 427 428 JVM_ENTRY(jarray, JVM_NewNullRestrictedArray(JNIEnv *env, jclass elmClass, jint len)) 429 oop mirror = JNIHandles::resolve_non_null(elmClass); 430 Klass* klass = java_lang_Class::as_Klass(mirror); 431 klass->initialize(CHECK_NULL); 432 validate_array_arguments(klass, len, CHECK_NULL); 433 InlineKlass* vk = InlineKlass::cast(klass); 434 if (!vk->is_implicitly_constructible()) { 435 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not implicitly constructible"); 436 } 437 oop array = nullptr; 438 if (vk->flat_array()) { 439 array = oopFactory::new_flatArray(vk, len, LayoutKind::NON_ATOMIC_FLAT, CHECK_NULL); 440 } else { 441 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL); 442 } 443 return (jarray) JNIHandles::make_local(THREAD, array); 444 JVM_END 445 446 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len)) 447 oop mirror = JNIHandles::resolve_non_null(elmClass); 448 Klass* klass = java_lang_Class::as_Klass(mirror); 449 klass->initialize(CHECK_NULL); 450 validate_array_arguments(klass, len, CHECK_NULL); 451 InlineKlass* vk = InlineKlass::cast(klass); 452 if (!vk->is_implicitly_constructible()) { 453 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not implicitly constructible"); 454 } 455 oop array = nullptr; 456 if (UseArrayFlattening && vk->has_atomic_layout()) { 457 array = oopFactory::new_flatArray(vk, len, LayoutKind::ATOMIC_FLAT, CHECK_NULL); 458 } else if (UseArrayFlattening && vk->is_naturally_atomic()) { 459 array = oopFactory::new_flatArray(vk, len, LayoutKind::NON_ATOMIC_FLAT, CHECK_NULL); 460 } else { 461 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL); 462 } 463 return (jarray) JNIHandles::make_local(THREAD, array); 464 JVM_END 465 466 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len)) 467 oop mirror = JNIHandles::resolve_non_null(elmClass); 468 Klass* klass = java_lang_Class::as_Klass(mirror); 469 klass->initialize(CHECK_NULL); 470 validate_array_arguments(klass, len, CHECK_NULL); 471 InlineKlass* vk = InlineKlass::cast(klass); 472 oop array = nullptr; 473 if (UseArrayFlattening && vk->has_nullable_atomic_layout()) { 474 array = oopFactory::new_flatArray(vk, len, LayoutKind::NULLABLE_ATOMIC_FLAT, CHECK_NULL); 475 } else { 476 array = oopFactory::new_objArray(vk, len, CHECK_NULL); 477 } 478 return (jarray) JNIHandles::make_local(THREAD, array); 479 JVM_END 480 481 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj)) 482 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj)); 483 return oop->is_flatArray(); 484 JVM_END 485 486 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj)) 487 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj)); 488 return oop->is_null_free_array(); 489 JVM_END 490 491 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 492 493 extern volatile jint vm_created; 494 495 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 496 EventShutdown event; 497 if (event.should_commit()) { 498 event.set_reason("Shutdown requested from Java"); 499 event.commit(); 500 } 501 JVM_END 502 503 504 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 505 before_exit(thread, true); 506 vm_exit(code); 507 JVM_END 508 509 510 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 511 if (!DisableExplicitGC) { 512 EventSystemGC event; 513 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent); 514 Universe::heap()->collect(GCCause::_java_lang_system_gc); 515 event.commit(); 516 } 517 JVM_END 518 519 520 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 521 return Universe::heap()->millis_since_last_whole_heap_examined(); 522 JVM_END 523 524 525 static inline jlong convert_size_t_to_jlong(size_t val) { 526 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 527 NOT_LP64 (return (jlong)val;) 528 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 529 } 530 531 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 532 size_t n = Universe::heap()->capacity(); 533 return convert_size_t_to_jlong(n); 534 JVM_END 535 536 537 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 538 size_t n = Universe::heap()->unused(); 539 return convert_size_t_to_jlong(n); 540 JVM_END 541 542 543 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 544 size_t n = Universe::heap()->max_capacity(); 545 return convert_size_t_to_jlong(n); 546 JVM_END 547 548 549 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 550 return os::active_processor_count(); 551 JVM_END 552 553 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void)) 554 #ifdef LINUX 555 if (UseContainerSupport) { 556 return JNI_TRUE; 557 } 558 #endif 559 return JNI_FALSE; 560 JVM_END 561 562 JVM_LEAF(jboolean, JVM_IsContainerized(void)) 563 #ifdef LINUX 564 if (OSContainer::is_containerized()) { 565 return JNI_TRUE; 566 } 567 #endif 568 return JNI_FALSE; 569 JVM_END 570 571 // java.lang.Throwable ////////////////////////////////////////////////////// 572 573 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 574 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 575 java_lang_Throwable::fill_in_stack_trace(exception); 576 JVM_END 577 578 // java.lang.NullPointerException /////////////////////////////////////////// 579 580 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 581 if (!ShowCodeDetailsInExceptionMessages) return nullptr; 582 583 oop exc = JNIHandles::resolve_non_null(throwable); 584 585 Method* method; 586 int bci; 587 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 588 return nullptr; 589 } 590 if (method->is_native()) { 591 return nullptr; 592 } 593 594 stringStream ss; 595 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 596 if (ok) { 597 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 598 return (jstring) JNIHandles::make_local(THREAD, result); 599 } else { 600 return nullptr; 601 } 602 JVM_END 603 604 // java.lang.StackTraceElement ////////////////////////////////////////////// 605 606 607 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth)) 608 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace)); 609 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 610 objArrayHandle stack_trace(THREAD, st); 611 // Fill in the allocated stack trace 612 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK); 613 JVM_END 614 615 616 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 617 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 618 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 619 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK); 620 JVM_END 621 622 623 // java.lang.StackWalker ////////////////////////////////////////////////////// 624 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj)) 625 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj)); 626 627 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr); 628 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr); 629 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info()); 630 if (!have_name) { 631 oop name = StringTable::intern(method->name(), CHECK); 632 java_lang_StackFrameInfo::set_name(stack_frame_info(), name); 633 } 634 if (!have_type) { 635 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK); 636 java_lang_StackFrameInfo::set_type(stack_frame_info(), type()); 637 } 638 JVM_END 639 640 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode, 641 jint skip_frames, jobject contScope, jobject cont, 642 jint buffer_size, jint start_index, jobjectArray frames)) 643 if (!thread->has_last_Java_frame()) { 644 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr); 645 } 646 647 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 648 Handle contScope_h(THREAD, JNIHandles::resolve(contScope)); 649 Handle cont_h(THREAD, JNIHandles::resolve(cont)); 650 // frames array is a ClassFrameInfo[] array when only getting caller reference, 651 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 652 // be null. 653 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 654 objArrayHandle frames_array_h(THREAD, fa); 655 656 if (frames_array_h->length() < buffer_size) { 657 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr); 658 } 659 660 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h, 661 buffer_size, start_index, frames_array_h, CHECK_NULL); 662 return JNIHandles::make_local(THREAD, result); 663 JVM_END 664 665 666 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor, 667 jint last_batch_count, jint buffer_size, jint start_index, 668 jobjectArray frames)) 669 // frames array is a ClassFrameInfo[] array when only getting caller reference, 670 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 671 // be null. 672 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 673 objArrayHandle frames_array_h(THREAD, fa); 674 675 if (frames_array_h->length() < buffer_size) { 676 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 677 } 678 679 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 680 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size, 681 start_index, frames_array_h, THREAD); 682 JVM_END 683 684 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont)) 685 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 686 objArrayHandle frames_array_h(THREAD, fa); 687 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 688 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont)); 689 690 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD); 691 JVM_END 692 693 // java.lang.Object /////////////////////////////////////////////// 694 695 696 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 697 // as implemented in the classic virtual machine; return 0 if object is null 698 if (handle == nullptr) { 699 return 0; 700 } 701 oop obj = JNIHandles::resolve_non_null(handle); 702 if (EnableValhalla && obj->klass()->is_inline_klass()) { 703 JavaValue result(T_INT); 704 JavaCallArguments args; 705 Handle ho(THREAD, obj); 706 args.push_oop(ho); 707 methodHandle method(THREAD, Universe::value_object_hash_code_method()); 708 JavaCalls::call(&result, method, &args, THREAD); 709 if (HAS_PENDING_EXCEPTION) { 710 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) { 711 Handle e(THREAD, PENDING_EXCEPTION); 712 CLEAR_PENDING_EXCEPTION; 713 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false); 714 } 715 } 716 return result.get_jint(); 717 } else { 718 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj)); 719 } 720 JVM_END 721 722 723 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 724 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 725 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 726 if (JvmtiExport::should_post_monitor_wait()) { 727 JvmtiExport::post_monitor_wait(thread, obj(), ms); 728 729 // The current thread already owns the monitor and it has not yet 730 // been added to the wait queue so the current thread cannot be 731 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 732 // event handler cannot accidentally consume an unpark() meant for 733 // the ParkEvent associated with this ObjectMonitor. 734 } 735 ObjectSynchronizer::wait(obj, ms, CHECK); 736 JVM_END 737 738 739 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 740 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 741 ObjectSynchronizer::notify(obj, CHECK); 742 JVM_END 743 744 745 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 746 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 747 ObjectSynchronizer::notifyall(obj, CHECK); 748 JVM_END 749 750 751 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 752 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 753 Klass* klass = obj->klass(); 754 JvmtiVMObjectAllocEventCollector oam; 755 756 #ifdef ASSERT 757 // Just checking that the cloneable flag is set correct 758 if (obj->is_array()) { 759 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 760 } else { 761 guarantee(obj->is_instance(), "should be instanceOop"); 762 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 763 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 764 } 765 #endif 766 767 // Check if class of obj supports the Cloneable interface. 768 // All arrays are considered to be cloneable (See JLS 20.1.5). 769 // All j.l.r.Reference classes are considered non-cloneable. 770 if (!klass->is_cloneable() || 771 (klass->is_instance_klass() && 772 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 773 ResourceMark rm(THREAD); 774 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 775 } 776 777 if (klass->is_inline_klass()) { 778 // Value instances have no identity, so return the current instance instead of allocating a new one 779 // Value classes cannot have finalizers, so the method can return immediately 780 return JNIHandles::make_local(THREAD, obj()); 781 } 782 783 // Make shallow object copy 784 const size_t size = obj->size(); 785 oop new_obj_oop = nullptr; 786 if (obj->is_array()) { 787 const int length = ((arrayOop)obj())->length(); 788 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 789 /* do_zero */ true, CHECK_NULL); 790 } else { 791 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 792 } 793 794 HeapAccess<>::clone(obj(), new_obj_oop, size); 795 796 Handle new_obj(THREAD, new_obj_oop); 797 // Caution: this involves a java upcall, so the clone should be 798 // "gc-robust" by this stage. 799 if (klass->has_finalizer()) { 800 assert(obj->is_instance(), "should be instanceOop"); 801 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 802 new_obj = Handle(THREAD, new_obj_oop); 803 } 804 805 return JNIHandles::make_local(THREAD, new_obj()); 806 JVM_END 807 808 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 809 810 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 811 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 812 JVM_END 813 814 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 815 return InstanceKlass::is_finalization_enabled(); 816 JVM_END 817 818 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 819 820 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 821 CONT_RegisterNativeMethods(env, cls); 822 JVM_END 823 824 // java.io.File /////////////////////////////////////////////////////////////// 825 826 JVM_LEAF(char*, JVM_NativePath(char* path)) 827 return os::native_path(path); 828 JVM_END 829 830 831 // Misc. class handling /////////////////////////////////////////////////////////// 832 833 834 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 835 // Getting the class of the caller frame. 836 // 837 // The call stack at this point looks something like this: 838 // 839 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ] 840 // [1] [ @CallerSensitive API.method ] 841 // [.] [ (skipped intermediate frames) ] 842 // [n] [ caller ] 843 vframeStream vfst(thread); 844 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 845 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 846 Method* m = vfst.method(); 847 assert(m != nullptr, "sanity"); 848 switch (n) { 849 case 0: 850 // This must only be called from Reflection.getCallerClass 851 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 852 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 853 } 854 // fall-through 855 case 1: 856 // Frame 0 and 1 must be caller sensitive. 857 if (!m->caller_sensitive()) { 858 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 859 } 860 break; 861 default: 862 if (!m->is_ignored_by_security_stack_walk()) { 863 // We have reached the desired frame; return the holder class. 864 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 865 } 866 break; 867 } 868 } 869 return nullptr; 870 JVM_END 871 872 873 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 874 oop mirror = nullptr; 875 BasicType t = name2type(utf); 876 if (t != T_ILLEGAL && !is_reference_type(t)) { 877 mirror = Universe::java_mirror(t); 878 } 879 if (mirror == nullptr) { 880 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 881 } else { 882 return (jclass) JNIHandles::make_local(THREAD, mirror); 883 } 884 JVM_END 885 886 887 // Returns a class loaded by the bootstrap class loader; or null 888 // if not found. ClassNotFoundException is not thrown. 889 // FindClassFromBootLoader is exported to the launcher for windows. 890 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 891 const char* name)) 892 // Java libraries should ensure that name is never null or illegal. 893 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 894 // It's impossible to create this class; the name cannot fit 895 // into the constant pool. 896 return nullptr; 897 } 898 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name"); 899 900 TempNewSymbol h_name = SymbolTable::new_symbol(name); 901 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 902 if (k == nullptr) { 903 return nullptr; 904 } 905 906 if (log_is_enabled(Debug, class, resolve)) { 907 trace_class_resolution(k); 908 } 909 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 910 JVM_END 911 912 // Find a class with this name in this loader, using the caller's protection domain. 913 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 914 jboolean init, jobject loader, 915 jclass caller)) 916 TempNewSymbol h_name = 917 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 918 CHECK_NULL); 919 920 oop loader_oop = JNIHandles::resolve(loader); 921 oop from_class = JNIHandles::resolve(caller); 922 Handle h_loader(THREAD, loader_oop); 923 924 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 925 false, THREAD); 926 927 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 928 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 929 } 930 return result; 931 JVM_END 932 933 // Currently only called from the old verifier. 934 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 935 jboolean init, jclass from)) 936 TempNewSymbol h_name = 937 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 938 CHECK_NULL); 939 oop from_class_oop = JNIHandles::resolve(from); 940 Klass* from_class = (from_class_oop == nullptr) 941 ? (Klass*)nullptr 942 : java_lang_Class::as_Klass(from_class_oop); 943 oop class_loader = nullptr; 944 if (from_class != nullptr) { 945 class_loader = from_class->class_loader(); 946 } 947 Handle h_loader(THREAD, class_loader); 948 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread); 949 950 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 951 // this function is generally only used for class loading during verification. 952 ResourceMark rm; 953 oop from_mirror = JNIHandles::resolve_non_null(from); 954 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 955 const char * from_name = from_class->external_name(); 956 957 oop mirror = JNIHandles::resolve_non_null(result); 958 Klass* to_class = java_lang_Class::as_Klass(mirror); 959 const char * to = to_class->external_name(); 960 log_debug(class, resolve)("%s %s (verification)", from_name, to); 961 } 962 963 return result; 964 JVM_END 965 966 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 967 static jclass jvm_define_class_common(const char *name, 968 jobject loader, const jbyte *buf, 969 jsize len, jobject pd, const char *source, 970 TRAPS) { 971 if (source == nullptr) source = "__JVM_DefineClass__"; 972 973 JavaThread* jt = THREAD; 974 975 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 976 ClassLoader::perf_define_appclass_selftime(), 977 ClassLoader::perf_define_appclasses(), 978 jt->get_thread_stat()->perf_recursion_counts_addr(), 979 jt->get_thread_stat()->perf_timers_addr(), 980 PerfClassTraceTime::DEFINE_CLASS); 981 982 if (UsePerfData) { 983 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 984 } 985 986 // Class resolution will get the class name from the .class stream if the name is null. 987 TempNewSymbol class_name = name == nullptr ? nullptr : 988 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 989 CHECK_NULL); 990 991 ResourceMark rm(THREAD); 992 ClassFileStream st((u1*)buf, len, source); 993 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 994 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 995 ClassLoadInfo cl_info(protection_domain); 996 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 997 class_loader, 998 cl_info, 999 CHECK_NULL); 1000 1001 if (log_is_enabled(Debug, class, resolve)) { 1002 trace_class_resolution(k); 1003 } 1004 1005 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1006 } 1007 1008 enum { 1009 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 1010 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 1011 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 1012 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 1013 }; 1014 1015 /* 1016 * Define a class with the specified flags that indicates if it's a nestmate, 1017 * hidden, or strongly referenced from class loader. 1018 */ 1019 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 1020 const jbyte *buf, jsize len, jobject pd, 1021 jboolean init, int flags, jobject classData, TRAPS) { 1022 ResourceMark rm(THREAD); 1023 1024 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup)); 1025 // Lookup class must be a non-null instance 1026 if (lookup_k == nullptr) { 1027 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1028 } 1029 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass"); 1030 1031 Handle class_loader (THREAD, lookup_k->class_loader()); 1032 1033 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 1034 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1035 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1036 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1037 1038 InstanceKlass* host_class = nullptr; 1039 if (is_nestmate) { 1040 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL); 1041 } 1042 1043 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1044 name, 1045 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1046 is_nestmate ? host_class->external_name() : "", 1047 is_hidden ? "hidden" : "not hidden", 1048 is_strong ? "strong" : "weak", 1049 vm_annotations ? "with vm annotations" : "without vm annotation"); 1050 1051 if (!is_hidden) { 1052 // classData is only applicable for hidden classes 1053 if (classData != nullptr) { 1054 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1055 } 1056 if (is_nestmate) { 1057 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1058 } 1059 if (!is_strong) { 1060 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1061 } 1062 if (vm_annotations) { 1063 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1064 } 1065 if (flags != STRONG_LOADER_LINK) { 1066 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1067 err_msg("invalid flag 0x%x", flags)); 1068 } 1069 } 1070 1071 // Class resolution will get the class name from the .class stream if the name is null. 1072 TempNewSymbol class_name = name == nullptr ? nullptr : 1073 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1074 CHECK_NULL); 1075 1076 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1077 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1078 ClassFileStream st((u1*)buf, len, source); 1079 1080 InstanceKlass* ik = nullptr; 1081 if (!is_hidden) { 1082 ClassLoadInfo cl_info(protection_domain); 1083 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1084 class_loader, 1085 cl_info, 1086 CHECK_NULL); 1087 1088 if (log_is_enabled(Debug, class, resolve)) { 1089 trace_class_resolution(ik); 1090 } 1091 } else { // hidden 1092 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1093 ClassLoadInfo cl_info(protection_domain, 1094 host_class, 1095 classData_h, 1096 is_hidden, 1097 is_strong, 1098 vm_annotations); 1099 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1100 class_loader, 1101 cl_info, 1102 CHECK_NULL); 1103 1104 // The hidden class loader data has been artificially been kept alive to 1105 // this point. The mirror and any instances of this class have to keep 1106 // it alive afterwards. 1107 ik->class_loader_data()->dec_keep_alive_ref_count(); 1108 1109 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1110 ModuleEntry* module = ik->module(); 1111 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1112 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1113 module_name, 1114 ik->external_name(), 1115 host_class->external_name(), 1116 ik->is_hidden() ? "is hidden" : "is not hidden"); 1117 } 1118 } 1119 1120 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) { 1121 // non-hidden class or nestmate class must be in the same package as the Lookup class 1122 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages"); 1123 } 1124 1125 if (init) { 1126 ik->initialize(CHECK_NULL); 1127 } else { 1128 ik->link_class(CHECK_NULL); 1129 } 1130 1131 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1132 } 1133 1134 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1135 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1136 JVM_END 1137 1138 /* 1139 * Define a class with the specified lookup class. 1140 * lookup: Lookup class 1141 * name: the name of the class 1142 * buf: class bytes 1143 * len: length of class bytes 1144 * pd: protection domain 1145 * init: initialize the class 1146 * flags: properties of the class 1147 * classData: private static pre-initialized field 1148 */ 1149 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1150 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1151 1152 if (lookup == nullptr) { 1153 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1154 } 1155 1156 assert(buf != nullptr, "buf must not be null"); 1157 1158 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1159 JVM_END 1160 1161 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1162 1163 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1164 JVM_END 1165 1166 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1167 ResourceMark rm(THREAD); 1168 1169 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1170 char* str = java_lang_String::as_utf8_string(h_name()); 1171 1172 // Sanity check, don't expect null 1173 if (str == nullptr) return nullptr; 1174 1175 // Internalize the string, converting '.' to '/' in string. 1176 char* p = (char*)str; 1177 while (*p != '\0') { 1178 if (*p == '.') { 1179 *p = '/'; 1180 } 1181 p++; 1182 } 1183 1184 const int str_len = (int)(p - str); 1185 if (str_len > Symbol::max_length()) { 1186 // It's impossible to create this class; the name cannot fit 1187 // into the constant pool. 1188 return nullptr; 1189 } 1190 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1191 1192 // Security Note: 1193 // The Java level wrapper will perform the necessary security check allowing 1194 // us to pass the null as the initiating class loader. 1195 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1196 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader); 1197 #if INCLUDE_CDS 1198 if (k == nullptr) { 1199 // If the class is not already loaded, try to see if it's in the shared 1200 // archive for the current classloader (h_loader). 1201 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1202 } 1203 #endif 1204 return (k == nullptr) ? nullptr : 1205 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1206 JVM_END 1207 1208 // Module support ////////////////////////////////////////////////////////////////////////////// 1209 1210 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1211 jstring location, jobjectArray packages)) 1212 Handle h_module (THREAD, JNIHandles::resolve(module)); 1213 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1214 JVM_END 1215 1216 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1217 Handle h_module (THREAD, JNIHandles::resolve(module)); 1218 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1219 JVM_END 1220 1221 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1222 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1223 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1224 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1225 JVM_END 1226 1227 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1228 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1229 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1230 JVM_END 1231 1232 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1233 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1234 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1235 JVM_END 1236 1237 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1238 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1239 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1240 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1241 JVM_END 1242 1243 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1244 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1245 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1246 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1247 JVM_END 1248 1249 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1250 1251 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1252 assert (cls != nullptr, "illegal class"); 1253 JvmtiVMObjectAllocEventCollector oam; 1254 ResourceMark rm(THREAD); 1255 HandleMark hm(THREAD); 1256 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1257 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1258 return (jstring) JNIHandles::make_local(THREAD, result); 1259 JVM_END 1260 1261 1262 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1263 JvmtiVMObjectAllocEventCollector oam; 1264 oop mirror = JNIHandles::resolve_non_null(cls); 1265 1266 // Special handling for primitive objects 1267 if (java_lang_Class::is_primitive(mirror)) { 1268 // Primitive objects does not have any interfaces 1269 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1270 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1271 } 1272 1273 Klass* klass = java_lang_Class::as_Klass(mirror); 1274 // Figure size of result array 1275 int size; 1276 if (klass->is_instance_klass()) { 1277 InstanceKlass* ik = InstanceKlass::cast(klass); 1278 size = ik->local_interfaces()->length(); 1279 } else { 1280 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass"); 1281 size = 2; 1282 } 1283 1284 // Allocate result array 1285 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1286 objArrayHandle result (THREAD, r); 1287 // Fill in result 1288 if (klass->is_instance_klass()) { 1289 // Regular instance klass, fill in all local interfaces 1290 for (int index = 0; index < size; index++) { 1291 InstanceKlass* ik = InstanceKlass::cast(klass); 1292 Klass* k = ik->local_interfaces()->at(index); 1293 result->obj_at_put(index, k->java_mirror()); 1294 } 1295 } else { 1296 // All arrays implement java.lang.Cloneable and java.io.Serializable 1297 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1298 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1299 } 1300 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1301 JVM_END 1302 1303 1304 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1305 oop mirror = JNIHandles::resolve_non_null(cls); 1306 if (java_lang_Class::is_primitive(mirror)) { 1307 return JNI_FALSE; 1308 } 1309 Klass* k = java_lang_Class::as_Klass(mirror); 1310 jboolean result = k->is_interface(); 1311 assert(!result || k->is_instance_klass(), 1312 "all interfaces are instance types"); 1313 // The compiler intrinsic for isInterface tests the 1314 // Klass::_access_flags bits in the same way. 1315 return result; 1316 JVM_END 1317 1318 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1319 oop mirror = JNIHandles::resolve_non_null(cls); 1320 if (java_lang_Class::is_primitive(mirror)) { 1321 return JNI_FALSE; 1322 } 1323 Klass* k = java_lang_Class::as_Klass(mirror); 1324 return k->is_hidden(); 1325 JVM_END 1326 1327 JVM_ENTRY(jboolean, JVM_IsIdentityClass(JNIEnv *env, jclass cls)) 1328 oop mirror = JNIHandles::resolve_non_null(cls); 1329 if (java_lang_Class::is_primitive(mirror)) { 1330 return JNI_FALSE; 1331 } 1332 Klass* k = java_lang_Class::as_Klass(mirror); 1333 if (EnableValhalla) { 1334 return k->is_array_klass() || k->is_identity_class(); 1335 } else { 1336 return k->is_interface() ? JNI_FALSE : JNI_TRUE; 1337 } 1338 JVM_END 1339 1340 JVM_ENTRY(jboolean, JVM_IsImplicitlyConstructibleClass(JNIEnv *env, jclass cls)) 1341 oop mirror = JNIHandles::resolve_non_null(cls); 1342 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1343 return ik->is_implicitly_constructible(); 1344 JVM_END 1345 1346 1347 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1348 oop mirror = JNIHandles::resolve_non_null(cls); 1349 if (mirror == nullptr) { 1350 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 1351 } 1352 1353 if (java_lang_Class::is_primitive(mirror)) { 1354 // Primitive types does not have a protection domain. 1355 return nullptr; 1356 } 1357 1358 oop pd = java_lang_Class::protection_domain(mirror); 1359 return (jobject) JNIHandles::make_local(THREAD, pd); 1360 JVM_END 1361 1362 1363 class ScopedValueBindingsResolver { 1364 public: 1365 InstanceKlass* Carrier_klass; 1366 ScopedValueBindingsResolver(JavaThread* THREAD) { 1367 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD); 1368 Carrier_klass = InstanceKlass::cast(k); 1369 } 1370 }; 1371 1372 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1373 ResourceMark rm(THREAD); 1374 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1375 JvmtiVMObjectAllocEventCollector oam; 1376 1377 static ScopedValueBindingsResolver resolver(THREAD); 1378 1379 // Iterate through Java frames 1380 vframeStream vfst(thread); 1381 for(; !vfst.at_end(); vfst.next()) { 1382 int loc = -1; 1383 // get method of frame 1384 Method* method = vfst.method(); 1385 1386 Symbol *name = method->name(); 1387 1388 InstanceKlass* holder = method->method_holder(); 1389 if (name == vmSymbols::runWith_method_name()) { 1390 if (holder == vmClasses::Thread_klass() 1391 || holder == resolver.Carrier_klass) { 1392 loc = 1; 1393 } 1394 } 1395 1396 if (loc != -1) { 1397 javaVFrame *frame = vfst.asJavaVFrame(); 1398 StackValueCollection* locals = frame->locals(); 1399 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot 1400 Handle result = head_sv->get_obj(); 1401 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1402 if (result() != nullptr) { 1403 return JNIHandles::make_local(THREAD, result()); 1404 } 1405 } 1406 } 1407 1408 return nullptr; 1409 JVM_END 1410 1411 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1412 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1413 return (k != nullptr) && k->is_array_klass() ? true : false; 1414 JVM_END 1415 1416 1417 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1418 oop mirror = JNIHandles::resolve_non_null(cls); 1419 return (jboolean) java_lang_Class::is_primitive(mirror); 1420 JVM_END 1421 1422 1423 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1424 oop mirror = JNIHandles::resolve_non_null(cls); 1425 if (java_lang_Class::is_primitive(mirror)) { 1426 // Primitive type 1427 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1428 } 1429 1430 Klass* k = java_lang_Class::as_Klass(mirror); 1431 debug_only(u2 computed_modifiers = k->compute_modifier_flags()); 1432 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1433 return k->modifier_flags(); 1434 JVM_END 1435 1436 1437 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1438 1439 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1440 JvmtiVMObjectAllocEventCollector oam; 1441 // ofClass is a reference to a java_lang_Class object. The mirror object 1442 // of an InstanceKlass 1443 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1444 if (java_lang_Class::is_primitive(ofMirror) || 1445 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1446 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1447 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1448 } 1449 1450 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1451 InnerClassesIterator iter(k); 1452 1453 if (iter.length() == 0) { 1454 // Neither an inner nor outer class 1455 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1456 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1457 } 1458 1459 // find inner class info 1460 constantPoolHandle cp(thread, k->constants()); 1461 int length = iter.length(); 1462 1463 // Allocate temp. result array 1464 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL); 1465 objArrayHandle result (THREAD, r); 1466 int members = 0; 1467 1468 for (; !iter.done(); iter.next()) { 1469 int ioff = iter.inner_class_info_index(); 1470 int ooff = iter.outer_class_info_index(); 1471 1472 if (ioff != 0 && ooff != 0) { 1473 // Check to see if the name matches the class we're looking for 1474 // before attempting to find the class. 1475 if (cp->klass_name_at_matches(k, ooff)) { 1476 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1477 if (outer_klass == k) { 1478 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1479 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1480 1481 // Throws an exception if outer klass has not declared k as 1482 // an inner klass 1483 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1484 1485 result->obj_at_put(members, inner_klass->java_mirror()); 1486 members++; 1487 } 1488 } 1489 } 1490 } 1491 1492 if (members != length) { 1493 // Return array of right length 1494 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL); 1495 for(int i = 0; i < members; i++) { 1496 res->obj_at_put(i, result->obj_at(i)); 1497 } 1498 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1499 } 1500 1501 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1502 JVM_END 1503 1504 1505 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1506 { 1507 // ofClass is a reference to a java_lang_Class object. 1508 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1509 if (java_lang_Class::is_primitive(ofMirror)) { 1510 return nullptr; 1511 } 1512 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1513 if (!klass->is_instance_klass()) { 1514 return nullptr; 1515 } 1516 1517 bool inner_is_member = false; 1518 Klass* outer_klass 1519 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1520 if (outer_klass == nullptr) return nullptr; // already a top-level class 1521 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1522 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1523 } 1524 JVM_END 1525 1526 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1527 { 1528 oop mirror = JNIHandles::resolve_non_null(cls); 1529 if (java_lang_Class::is_primitive(mirror)) { 1530 return nullptr; 1531 } 1532 Klass* klass = java_lang_Class::as_Klass(mirror); 1533 if (!klass->is_instance_klass()) { 1534 return nullptr; 1535 } 1536 InstanceKlass* k = InstanceKlass::cast(klass); 1537 int ooff = 0, noff = 0; 1538 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1539 if (noff != 0) { 1540 constantPoolHandle i_cp(thread, k->constants()); 1541 Symbol* name = i_cp->symbol_at(noff); 1542 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1543 return (jstring) JNIHandles::make_local(THREAD, str()); 1544 } 1545 } 1546 return nullptr; 1547 } 1548 JVM_END 1549 1550 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1551 assert (cls != nullptr, "illegal class"); 1552 JvmtiVMObjectAllocEventCollector oam; 1553 ResourceMark rm(THREAD); 1554 oop mirror = JNIHandles::resolve_non_null(cls); 1555 // Return null for arrays and primitives 1556 if (!java_lang_Class::is_primitive(mirror)) { 1557 Klass* k = java_lang_Class::as_Klass(mirror); 1558 if (k->is_instance_klass()) { 1559 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1560 if (sym == nullptr) return nullptr; 1561 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1562 return (jstring) JNIHandles::make_local(THREAD, str()); 1563 } 1564 } 1565 return nullptr; 1566 JVM_END 1567 1568 1569 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1570 assert (cls != nullptr, "illegal class"); 1571 oop mirror = JNIHandles::resolve_non_null(cls); 1572 // Return null for arrays and primitives 1573 if (!java_lang_Class::is_primitive(mirror)) { 1574 Klass* k = java_lang_Class::as_Klass(mirror); 1575 if (k->is_instance_klass()) { 1576 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1577 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1578 } 1579 } 1580 return nullptr; 1581 JVM_END 1582 1583 1584 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1585 // some of this code was adapted from from jni_FromReflectedField 1586 1587 oop reflected = JNIHandles::resolve_non_null(field); 1588 oop mirror = java_lang_reflect_Field::clazz(reflected); 1589 Klass* k = java_lang_Class::as_Klass(mirror); 1590 int slot = java_lang_reflect_Field::slot(reflected); 1591 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1592 1593 InstanceKlass* ik = InstanceKlass::cast(k); 1594 int offset = ik->field_offset(slot); 1595 1596 if (modifiers & JVM_ACC_STATIC) { 1597 // for static fields we only look in the current class 1598 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1599 assert(false, "cannot find static field"); 1600 return false; 1601 } 1602 } else { 1603 // for instance fields we start with the current class and work 1604 // our way up through the superclass chain 1605 if (!ik->find_field_from_offset(offset, false, &fd)) { 1606 assert(false, "cannot find instance field"); 1607 return false; 1608 } 1609 } 1610 return true; 1611 } 1612 1613 static Method* jvm_get_method_common(jobject method) { 1614 // some of this code was adapted from from jni_FromReflectedMethod 1615 1616 oop reflected = JNIHandles::resolve_non_null(method); 1617 oop mirror = nullptr; 1618 int slot = 0; 1619 1620 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1621 mirror = java_lang_reflect_Constructor::clazz(reflected); 1622 slot = java_lang_reflect_Constructor::slot(reflected); 1623 } else { 1624 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1625 "wrong type"); 1626 mirror = java_lang_reflect_Method::clazz(reflected); 1627 slot = java_lang_reflect_Method::slot(reflected); 1628 } 1629 Klass* k = java_lang_Class::as_Klass(mirror); 1630 1631 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1632 assert(m != nullptr, "cannot find method"); 1633 return m; // caller has to deal with null in product mode 1634 } 1635 1636 /* Type use annotations support (JDK 1.8) */ 1637 1638 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1639 assert (cls != nullptr, "illegal class"); 1640 ResourceMark rm(THREAD); 1641 // Return null for arrays and primitives 1642 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1643 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1644 if (k->is_instance_klass()) { 1645 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1646 if (type_annotations != nullptr) { 1647 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1648 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1649 } 1650 } 1651 } 1652 return nullptr; 1653 JVM_END 1654 1655 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1656 assert (method != nullptr, "illegal method"); 1657 // method is a handle to a java.lang.reflect.Method object 1658 Method* m = jvm_get_method_common(method); 1659 if (m == nullptr) { 1660 return nullptr; 1661 } 1662 1663 AnnotationArray* type_annotations = m->type_annotations(); 1664 if (type_annotations != nullptr) { 1665 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1666 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1667 } 1668 1669 return nullptr; 1670 JVM_END 1671 1672 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1673 assert (field != nullptr, "illegal field"); 1674 fieldDescriptor fd; 1675 bool gotFd = jvm_get_field_common(field, fd); 1676 if (!gotFd) { 1677 return nullptr; 1678 } 1679 1680 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1681 JVM_END 1682 1683 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1684 if (!cp->is_within_bounds(index)) { 1685 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1686 } 1687 } 1688 1689 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1690 { 1691 // method is a handle to a java.lang.reflect.Method object 1692 Method* method_ptr = jvm_get_method_common(method); 1693 methodHandle mh (THREAD, method_ptr); 1694 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1695 const int num_params = mh->method_parameters_length(); 1696 1697 if (num_params < 0) { 1698 // A -1 return value from method_parameters_length means there is no 1699 // parameter data. Return null to indicate this to the reflection 1700 // API. 1701 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1702 return (jobjectArray)nullptr; 1703 } else { 1704 // Otherwise, we return something up to reflection, even if it is 1705 // a zero-length array. Why? Because in some cases this can 1706 // trigger a MalformedParametersException. 1707 1708 // make sure all the symbols are properly formatted 1709 for (int i = 0; i < num_params; i++) { 1710 MethodParametersElement* params = mh->method_parameters_start(); 1711 int index = params[i].name_cp_index; 1712 constantPoolHandle cp(THREAD, mh->constants()); 1713 bounds_check(cp, index, CHECK_NULL); 1714 1715 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1716 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1717 "Wrong type at constant pool index"); 1718 } 1719 1720 } 1721 1722 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1723 objArrayHandle result (THREAD, result_oop); 1724 1725 for (int i = 0; i < num_params; i++) { 1726 MethodParametersElement* params = mh->method_parameters_start(); 1727 // For a 0 index, give a null symbol 1728 Symbol* sym = 0 != params[i].name_cp_index ? 1729 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1730 int flags = params[i].flags; 1731 oop param = Reflection::new_parameter(reflected_method, i, sym, 1732 flags, CHECK_NULL); 1733 result->obj_at_put(i, param); 1734 } 1735 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1736 } 1737 } 1738 JVM_END 1739 1740 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1741 1742 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1743 { 1744 JvmtiVMObjectAllocEventCollector oam; 1745 1746 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1747 // Exclude primitive types and array types 1748 if (java_lang_Class::is_primitive(ofMirror) || 1749 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1750 // Return empty array 1751 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1752 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1753 } 1754 1755 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1756 constantPoolHandle cp(THREAD, k->constants()); 1757 1758 // Ensure class is linked 1759 k->link_class(CHECK_NULL); 1760 1761 // Allocate result 1762 int num_fields; 1763 1764 if (publicOnly) { 1765 num_fields = 0; 1766 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1767 if (fs.access_flags().is_public()) ++num_fields; 1768 } 1769 } else { 1770 num_fields = k->java_fields_count(); 1771 } 1772 1773 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1774 objArrayHandle result (THREAD, r); 1775 1776 int out_idx = 0; 1777 fieldDescriptor fd; 1778 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1779 if (!publicOnly || fs.access_flags().is_public()) { 1780 fd.reinitialize(k, fs.index()); 1781 oop field = Reflection::new_field(&fd, CHECK_NULL); 1782 result->obj_at_put(out_idx, field); 1783 ++out_idx; 1784 } 1785 } 1786 assert(out_idx == num_fields, "just checking"); 1787 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1788 } 1789 JVM_END 1790 1791 // A class is a record if and only if it is final and a direct subclass of 1792 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1793 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1794 { 1795 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1796 if (k != nullptr && k->is_instance_klass()) { 1797 InstanceKlass* ik = InstanceKlass::cast(k); 1798 return ik->is_record(); 1799 } else { 1800 return false; 1801 } 1802 } 1803 JVM_END 1804 1805 // Returns an array containing the components of the Record attribute, 1806 // or null if the attribute is not present. 1807 // 1808 // Note that this function returns the components of the Record attribute 1809 // even if the class is not a record. 1810 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1811 { 1812 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1813 assert(c->is_instance_klass(), "must be"); 1814 InstanceKlass* ik = InstanceKlass::cast(c); 1815 1816 Array<RecordComponent*>* components = ik->record_components(); 1817 if (components != nullptr) { 1818 JvmtiVMObjectAllocEventCollector oam; 1819 constantPoolHandle cp(THREAD, ik->constants()); 1820 int length = components->length(); 1821 assert(length >= 0, "unexpected record_components length"); 1822 objArrayOop record_components = 1823 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1824 objArrayHandle components_h (THREAD, record_components); 1825 1826 for (int x = 0; x < length; x++) { 1827 RecordComponent* component = components->at(x); 1828 assert(component != nullptr, "unexpected null record component"); 1829 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1830 components_h->obj_at_put(x, component_oop); 1831 } 1832 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1833 } 1834 1835 return nullptr; 1836 } 1837 JVM_END 1838 1839 static jobjectArray get_class_declared_methods_helper( 1840 JNIEnv *env, 1841 jclass ofClass, jboolean publicOnly, 1842 bool want_constructor, 1843 Klass* klass, TRAPS) { 1844 1845 JvmtiVMObjectAllocEventCollector oam; 1846 1847 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1848 // Exclude primitive types and array types 1849 if (java_lang_Class::is_primitive(ofMirror) 1850 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1851 // Return empty array 1852 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1853 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1854 } 1855 1856 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1857 1858 // Ensure class is linked 1859 k->link_class(CHECK_NULL); 1860 1861 Array<Method*>* methods = k->methods(); 1862 int methods_length = methods->length(); 1863 1864 // Save original method_idnum in case of redefinition, which can change 1865 // the idnum of obsolete methods. The new method will have the same idnum 1866 // but if we refresh the methods array, the counts will be wrong. 1867 ResourceMark rm(THREAD); 1868 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1869 int num_methods = 0; 1870 1871 // Select methods matching the criteria. 1872 for (int i = 0; i < methods_length; i++) { 1873 Method* method = methods->at(i); 1874 if (want_constructor && !method->is_object_constructor()) { 1875 continue; 1876 } 1877 if (!want_constructor && 1878 (method->is_object_constructor() || method->is_class_initializer() || 1879 method->is_overpass())) { 1880 continue; 1881 } 1882 if (publicOnly && !method->is_public()) { 1883 continue; 1884 } 1885 idnums->push(method->method_idnum()); 1886 ++num_methods; 1887 } 1888 1889 // Allocate result 1890 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1891 objArrayHandle result (THREAD, r); 1892 1893 // Now just put the methods that we selected above, but go by their idnum 1894 // in case of redefinition. The methods can be redefined at any safepoint, 1895 // so above when allocating the oop array and below when creating reflect 1896 // objects. 1897 for (int i = 0; i < num_methods; i++) { 1898 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1899 if (method.is_null()) { 1900 // Method may have been deleted and seems this API can handle null 1901 // Otherwise should probably put a method that throws NSME 1902 result->obj_at_put(i, nullptr); 1903 } else { 1904 oop m; 1905 if (want_constructor) { 1906 assert(method->is_object_constructor(), "must be"); 1907 m = Reflection::new_constructor(method, CHECK_NULL); 1908 } else { 1909 m = Reflection::new_method(method, false, CHECK_NULL); 1910 } 1911 result->obj_at_put(i, m); 1912 } 1913 } 1914 1915 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1916 } 1917 1918 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1919 { 1920 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1921 /*want_constructor*/ false, 1922 vmClasses::reflect_Method_klass(), THREAD); 1923 } 1924 JVM_END 1925 1926 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1927 { 1928 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1929 /*want_constructor*/ true, 1930 vmClasses::reflect_Constructor_klass(), THREAD); 1931 } 1932 JVM_END 1933 1934 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1935 { 1936 oop mirror = JNIHandles::resolve_non_null(cls); 1937 if (java_lang_Class::is_primitive(mirror)) { 1938 // Primitive type 1939 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1940 } 1941 1942 Klass* k = java_lang_Class::as_Klass(mirror); 1943 return k->access_flags().as_class_flags(); 1944 } 1945 JVM_END 1946 1947 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1948 { 1949 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1950 assert(c->is_instance_klass(), "must be"); 1951 InstanceKlass* ck = InstanceKlass::cast(c); 1952 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 1953 assert(m->is_instance_klass(), "must be"); 1954 InstanceKlass* mk = InstanceKlass::cast(m); 1955 return ck->has_nestmate_access_to(mk, THREAD); 1956 } 1957 JVM_END 1958 1959 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1960 { 1961 // current is not a primitive or array class 1962 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1963 assert(c->is_instance_klass(), "must be"); 1964 InstanceKlass* ck = InstanceKlass::cast(c); 1965 InstanceKlass* host = ck->nest_host(THREAD); 1966 return (jclass) (host == nullptr ? nullptr : 1967 JNIHandles::make_local(THREAD, host->java_mirror())); 1968 } 1969 JVM_END 1970 1971 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1972 { 1973 // current is not a primitive or array class 1974 ResourceMark rm(THREAD); 1975 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1976 assert(c->is_instance_klass(), "must be"); 1977 InstanceKlass* ck = InstanceKlass::cast(c); 1978 InstanceKlass* host = ck->nest_host(THREAD); 1979 1980 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 1981 ck->external_name(), host->external_name()); 1982 { 1983 JvmtiVMObjectAllocEventCollector oam; 1984 Array<u2>* members = host->nest_members(); 1985 int length = members == nullptr ? 0 : members->length(); 1986 1987 log_trace(class, nestmates)(" - host has %d listed nest members", length); 1988 1989 // nest host is first in the array so make it one bigger 1990 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 1991 length + 1, CHECK_NULL); 1992 objArrayHandle result(THREAD, r); 1993 result->obj_at_put(0, host->java_mirror()); 1994 if (length != 0) { 1995 int count = 0; 1996 for (int i = 0; i < length; i++) { 1997 int cp_index = members->at(i); 1998 Klass* k = host->constants()->klass_at(cp_index, THREAD); 1999 if (HAS_PENDING_EXCEPTION) { 2000 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2001 return nullptr; // propagate VMEs 2002 } 2003 if (log_is_enabled(Trace, class, nestmates)) { 2004 stringStream ss; 2005 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2006 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2007 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2008 log_trace(class, nestmates)("%s", ss.as_string()); 2009 } 2010 CLEAR_PENDING_EXCEPTION; 2011 continue; 2012 } 2013 if (k->is_instance_klass()) { 2014 InstanceKlass* ik = InstanceKlass::cast(k); 2015 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2016 if (nest_host_k == host) { 2017 result->obj_at_put(count+1, k->java_mirror()); 2018 count++; 2019 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2020 } else { 2021 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2022 ik->external_name(), nest_host_k->external_name()); 2023 } 2024 } else { 2025 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2026 k->external_name()); 2027 } 2028 } 2029 if (count < length) { 2030 // we had invalid entries so we need to compact the array 2031 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2032 length + 1, count + 1); 2033 2034 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2035 count + 1, CHECK_NULL); 2036 objArrayHandle result2(THREAD, r2); 2037 for (int i = 0; i < count + 1; i++) { 2038 result2->obj_at_put(i, result->obj_at(i)); 2039 } 2040 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2041 } 2042 } 2043 else { 2044 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate"); 2045 } 2046 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2047 } 2048 } 2049 JVM_END 2050 2051 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2052 { 2053 oop mirror = JNIHandles::resolve_non_null(current); 2054 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2055 Klass* c = java_lang_Class::as_Klass(mirror); 2056 assert(c->is_instance_klass(), "must be"); 2057 InstanceKlass* ik = InstanceKlass::cast(c); 2058 ResourceMark rm(THREAD); 2059 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2060 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2061 if (ik->is_sealed()) { 2062 JvmtiVMObjectAllocEventCollector oam; 2063 Array<u2>* subclasses = ik->permitted_subclasses(); 2064 int length = subclasses->length(); 2065 2066 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2067 2068 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2069 length, CHECK_NULL); 2070 objArrayHandle result(THREAD, r); 2071 int count = 0; 2072 for (int i = 0; i < length; i++) { 2073 int cp_index = subclasses->at(i); 2074 Klass* k = ik->constants()->klass_at(cp_index, THREAD); 2075 if (HAS_PENDING_EXCEPTION) { 2076 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2077 return nullptr; // propagate VMEs 2078 } 2079 if (log_is_enabled(Trace, class, sealed)) { 2080 stringStream ss; 2081 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2082 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2083 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2084 log_trace(class, sealed)("%s", ss.as_string()); 2085 } 2086 2087 CLEAR_PENDING_EXCEPTION; 2088 continue; 2089 } 2090 if (k->is_instance_klass()) { 2091 result->obj_at_put(count++, k->java_mirror()); 2092 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2093 } 2094 } 2095 if (count < length) { 2096 // we had invalid entries so we need to compact the array 2097 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2098 count, CHECK_NULL); 2099 objArrayHandle result2(THREAD, r2); 2100 for (int i = 0; i < count; i++) { 2101 result2->obj_at_put(i, result->obj_at(i)); 2102 } 2103 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2104 } 2105 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2106 } else { 2107 return nullptr; 2108 } 2109 } 2110 JVM_END 2111 2112 // Constant pool access ////////////////////////////////////////////////////////// 2113 2114 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2115 { 2116 JvmtiVMObjectAllocEventCollector oam; 2117 oop mirror = JNIHandles::resolve_non_null(cls); 2118 // Return null for primitives and arrays 2119 if (!java_lang_Class::is_primitive(mirror)) { 2120 Klass* k = java_lang_Class::as_Klass(mirror); 2121 if (k->is_instance_klass()) { 2122 InstanceKlass* k_h = InstanceKlass::cast(k); 2123 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2124 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2125 return JNIHandles::make_local(THREAD, jcp()); 2126 } 2127 } 2128 return nullptr; 2129 } 2130 JVM_END 2131 2132 2133 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2134 { 2135 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2136 return cp->length(); 2137 } 2138 JVM_END 2139 2140 2141 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2142 { 2143 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2144 bounds_check(cp, index, CHECK_NULL); 2145 constantTag tag = cp->tag_at(index); 2146 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2147 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2148 } 2149 Klass* k = cp->klass_at(index, CHECK_NULL); 2150 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2151 } 2152 JVM_END 2153 2154 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2155 { 2156 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2157 bounds_check(cp, index, CHECK_NULL); 2158 constantTag tag = cp->tag_at(index); 2159 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2160 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2161 } 2162 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2163 if (k == nullptr) return nullptr; 2164 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2165 } 2166 JVM_END 2167 2168 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2169 constantTag tag = cp->tag_at(index); 2170 if (!tag.is_method() && !tag.is_interface_method()) { 2171 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2172 } 2173 int klass_ref = cp->uncached_klass_ref_index_at(index); 2174 Klass* k_o; 2175 if (force_resolution) { 2176 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2177 } else { 2178 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2179 if (k_o == nullptr) return nullptr; 2180 } 2181 InstanceKlass* k = InstanceKlass::cast(k_o); 2182 Symbol* name = cp->uncached_name_ref_at(index); 2183 Symbol* sig = cp->uncached_signature_ref_at(index); 2184 methodHandle m (THREAD, k->find_method(name, sig)); 2185 if (m.is_null()) { 2186 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2187 } 2188 oop method; 2189 if (m->is_object_constructor()) { 2190 method = Reflection::new_constructor(m, CHECK_NULL); 2191 } else { 2192 method = Reflection::new_method(m, true, CHECK_NULL); 2193 } 2194 return JNIHandles::make_local(THREAD, method); 2195 } 2196 2197 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2198 { 2199 JvmtiVMObjectAllocEventCollector oam; 2200 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2201 bounds_check(cp, index, CHECK_NULL); 2202 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2203 return res; 2204 } 2205 JVM_END 2206 2207 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2208 { 2209 JvmtiVMObjectAllocEventCollector oam; 2210 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2211 bounds_check(cp, index, CHECK_NULL); 2212 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2213 return res; 2214 } 2215 JVM_END 2216 2217 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2218 constantTag tag = cp->tag_at(index); 2219 if (!tag.is_field()) { 2220 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2221 } 2222 int klass_ref = cp->uncached_klass_ref_index_at(index); 2223 Klass* k_o; 2224 if (force_resolution) { 2225 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2226 } else { 2227 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2228 if (k_o == nullptr) return nullptr; 2229 } 2230 InstanceKlass* k = InstanceKlass::cast(k_o); 2231 Symbol* name = cp->uncached_name_ref_at(index); 2232 Symbol* sig = cp->uncached_signature_ref_at(index); 2233 fieldDescriptor fd; 2234 Klass* target_klass = k->find_field(name, sig, &fd); 2235 if (target_klass == nullptr) { 2236 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2237 } 2238 oop field = Reflection::new_field(&fd, CHECK_NULL); 2239 return JNIHandles::make_local(THREAD, field); 2240 } 2241 2242 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2243 { 2244 JvmtiVMObjectAllocEventCollector oam; 2245 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2246 bounds_check(cp, index, CHECK_NULL); 2247 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2248 return res; 2249 } 2250 JVM_END 2251 2252 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2253 { 2254 JvmtiVMObjectAllocEventCollector oam; 2255 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2256 bounds_check(cp, index, CHECK_NULL); 2257 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2258 return res; 2259 } 2260 JVM_END 2261 2262 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2263 { 2264 JvmtiVMObjectAllocEventCollector oam; 2265 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2266 bounds_check(cp, index, CHECK_NULL); 2267 constantTag tag = cp->tag_at(index); 2268 if (!tag.is_field_or_method()) { 2269 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2270 } 2271 int klass_ref = cp->uncached_klass_ref_index_at(index); 2272 Symbol* klass_name = cp->klass_name_at(klass_ref); 2273 Symbol* member_name = cp->uncached_name_ref_at(index); 2274 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2275 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2276 objArrayHandle dest(THREAD, dest_o); 2277 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2278 dest->obj_at_put(0, str()); 2279 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2280 dest->obj_at_put(1, str()); 2281 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2282 dest->obj_at_put(2, str()); 2283 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2284 } 2285 JVM_END 2286 2287 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2288 { 2289 JvmtiVMObjectAllocEventCollector oam; 2290 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2291 bounds_check(cp, index, CHECK_0); 2292 constantTag tag = cp->tag_at(index); 2293 if (!tag.is_field_or_method()) { 2294 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2295 } 2296 return (jint) cp->uncached_klass_ref_index_at(index); 2297 } 2298 JVM_END 2299 2300 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2301 { 2302 JvmtiVMObjectAllocEventCollector oam; 2303 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2304 bounds_check(cp, index, CHECK_0); 2305 constantTag tag = cp->tag_at(index); 2306 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2307 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2308 } 2309 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2310 } 2311 JVM_END 2312 2313 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2314 { 2315 JvmtiVMObjectAllocEventCollector oam; 2316 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2317 bounds_check(cp, index, CHECK_NULL); 2318 constantTag tag = cp->tag_at(index); 2319 if (!tag.is_name_and_type()) { 2320 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2321 } 2322 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2323 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2324 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2325 objArrayHandle dest(THREAD, dest_o); 2326 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2327 dest->obj_at_put(0, str()); 2328 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2329 dest->obj_at_put(1, str()); 2330 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2331 } 2332 JVM_END 2333 2334 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2335 { 2336 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2337 bounds_check(cp, index, CHECK_0); 2338 constantTag tag = cp->tag_at(index); 2339 if (!tag.is_int()) { 2340 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2341 } 2342 return cp->int_at(index); 2343 } 2344 JVM_END 2345 2346 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2347 { 2348 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2349 bounds_check(cp, index, CHECK_(0L)); 2350 constantTag tag = cp->tag_at(index); 2351 if (!tag.is_long()) { 2352 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2353 } 2354 return cp->long_at(index); 2355 } 2356 JVM_END 2357 2358 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2359 { 2360 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2361 bounds_check(cp, index, CHECK_(0.0f)); 2362 constantTag tag = cp->tag_at(index); 2363 if (!tag.is_float()) { 2364 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2365 } 2366 return cp->float_at(index); 2367 } 2368 JVM_END 2369 2370 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2371 { 2372 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2373 bounds_check(cp, index, CHECK_(0.0)); 2374 constantTag tag = cp->tag_at(index); 2375 if (!tag.is_double()) { 2376 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2377 } 2378 return cp->double_at(index); 2379 } 2380 JVM_END 2381 2382 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2383 { 2384 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2385 bounds_check(cp, index, CHECK_NULL); 2386 constantTag tag = cp->tag_at(index); 2387 if (!tag.is_string()) { 2388 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2389 } 2390 oop str = cp->string_at(index, CHECK_NULL); 2391 return (jstring) JNIHandles::make_local(THREAD, str); 2392 } 2393 JVM_END 2394 2395 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2396 { 2397 JvmtiVMObjectAllocEventCollector oam; 2398 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2399 bounds_check(cp, index, CHECK_NULL); 2400 constantTag tag = cp->tag_at(index); 2401 if (!tag.is_symbol()) { 2402 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2403 } 2404 Symbol* sym = cp->symbol_at(index); 2405 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2406 return (jstring) JNIHandles::make_local(THREAD, str()); 2407 } 2408 JVM_END 2409 2410 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2411 { 2412 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2413 bounds_check(cp, index, CHECK_0); 2414 constantTag tag = cp->tag_at(index); 2415 jbyte result = tag.value(); 2416 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2417 // they are changed to the corresponding tags from the JVM spec, so that java code in 2418 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2419 if (tag.is_klass_or_reference()) { 2420 result = JVM_CONSTANT_Class; 2421 } else if (tag.is_string_index()) { 2422 result = JVM_CONSTANT_String; 2423 } else if (tag.is_method_type_in_error()) { 2424 result = JVM_CONSTANT_MethodType; 2425 } else if (tag.is_method_handle_in_error()) { 2426 result = JVM_CONSTANT_MethodHandle; 2427 } else if (tag.is_dynamic_constant_in_error()) { 2428 result = JVM_CONSTANT_Dynamic; 2429 } 2430 return result; 2431 } 2432 JVM_END 2433 2434 // Assertion support. ////////////////////////////////////////////////////////// 2435 2436 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2437 assert(cls != nullptr, "bad class"); 2438 2439 oop r = JNIHandles::resolve(cls); 2440 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2441 if (java_lang_Class::is_primitive(r)) return false; 2442 2443 Klass* k = java_lang_Class::as_Klass(r); 2444 assert(k->is_instance_klass(), "must be an instance klass"); 2445 if (!k->is_instance_klass()) return false; 2446 2447 ResourceMark rm(THREAD); 2448 const char* name = k->name()->as_C_string(); 2449 bool system_class = k->class_loader() == nullptr; 2450 return JavaAssertions::enabled(name, system_class); 2451 2452 JVM_END 2453 2454 2455 // Return a new AssertionStatusDirectives object with the fields filled in with 2456 // command-line assertion arguments (i.e., -ea, -da). 2457 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2458 JvmtiVMObjectAllocEventCollector oam; 2459 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2460 return JNIHandles::make_local(THREAD, asd); 2461 JVM_END 2462 2463 // Arrays support ///////////////////////////////////////////////////////////// 2464 2465 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2466 oop o = JNIHandles::resolve(array); 2467 Klass* k = o->klass(); 2468 if ((o == nullptr) || (!k->is_array_klass())) { 2469 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2470 } 2471 return ArrayKlass::cast(k)->element_access_must_be_atomic(); 2472 JVM_END 2473 2474 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2475 oop o = JNIHandles::resolve(array); 2476 Klass* k = o->klass(); 2477 if ((o == nullptr) || (!k->is_array_klass())) { 2478 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2479 } 2480 if (k->is_flatArray_klass()) { 2481 FlatArrayKlass* vk = FlatArrayKlass::cast(k); 2482 if (!vk->element_access_must_be_atomic()) { 2483 /** 2484 * Need to decide how to implement: 2485 * 2486 * 1) Change to objArrayOop layout, therefore oop->klass() differs so 2487 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through 2488 * "checkcast" & "instanceof" 2489 * 2490 * 2) Use extra header in the flatArrayOop to flag atomicity required and 2491 * possibly per instance lock structure. Said info, could be placed in 2492 * "trailer" rather than disturb the current arrayOop 2493 */ 2494 Unimplemented(); 2495 } 2496 } 2497 return array; 2498 JVM_END 2499 2500 // Verification //////////////////////////////////////////////////////////////////////////////// 2501 2502 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2503 2504 // RedefineClasses support: bug 6214132 caused verification to fail. 2505 // All functions from this section should call the jvmtiThreadSate function: 2506 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2507 // The function returns a Klass* of the _scratch_class if the verifier 2508 // was invoked in the middle of the class redefinition. 2509 // Otherwise it returns its argument value which is the _the_class Klass*. 2510 // Please, refer to the description in the jvmtiThreadSate.hpp. 2511 2512 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2513 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2514 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2515 return k->name()->as_utf8(); 2516 JVM_END 2517 2518 2519 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2520 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2521 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2522 // types will have length zero if this is not an InstanceKlass 2523 // (length is determined by call to JVM_GetClassCPEntriesCount) 2524 if (k->is_instance_klass()) { 2525 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2526 for (int index = cp->length() - 1; index >= 0; index--) { 2527 constantTag tag = cp->tag_at(index); 2528 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2529 } 2530 } 2531 JVM_END 2532 2533 2534 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2535 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2536 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2537 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2538 JVM_END 2539 2540 2541 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2542 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2543 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2544 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2545 JVM_END 2546 2547 2548 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2549 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2550 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2551 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2552 JVM_END 2553 2554 2555 // The following methods, used for the verifier, are never called with 2556 // array klasses, so a direct cast to InstanceKlass is safe. 2557 // Typically, these methods are called in a loop with bounds determined 2558 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2559 // zero for arrays. 2560 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2561 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2562 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2563 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2564 int length = method->checked_exceptions_length(); 2565 if (length > 0) { 2566 CheckedExceptionElement* table= method->checked_exceptions_start(); 2567 for (int i = 0; i < length; i++) { 2568 exceptions[i] = table[i].class_cp_index; 2569 } 2570 } 2571 JVM_END 2572 2573 2574 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2575 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2576 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2577 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2578 return method->checked_exceptions_length(); 2579 JVM_END 2580 2581 2582 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2583 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2584 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2585 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2586 memcpy(code, method->code_base(), method->code_size()); 2587 JVM_END 2588 2589 2590 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint 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->code_size(); 2595 JVM_END 2596 2597 2598 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 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 ExceptionTable extable(method); 2603 entry->start_pc = extable.start_pc(entry_index); 2604 entry->end_pc = extable.end_pc(entry_index); 2605 entry->handler_pc = extable.handler_pc(entry_index); 2606 entry->catchType = extable.catch_type_index(entry_index); 2607 JVM_END 2608 2609 2610 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2611 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2612 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2613 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2614 return method->exception_table_length(); 2615 JVM_END 2616 2617 2618 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2619 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2620 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2621 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2622 return method->access_flags().as_method_flags(); 2623 JVM_END 2624 2625 2626 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2627 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2628 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2629 return InstanceKlass::cast(k)->field_access_flags(field_index); 2630 JVM_END 2631 2632 2633 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2634 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2635 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2636 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2637 return method->max_locals(); 2638 JVM_END 2639 2640 2641 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2642 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2643 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2644 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2645 return method->size_of_parameters(); 2646 JVM_END 2647 2648 2649 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2650 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2651 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2652 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2653 return method->verifier_max_stack(); 2654 JVM_END 2655 2656 2657 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2658 ResourceMark rm(THREAD); 2659 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2660 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2661 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2662 return method->is_object_constructor(); 2663 JVM_END 2664 2665 2666 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2667 ResourceMark rm(THREAD); 2668 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2669 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2670 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2671 return method->is_overpass(); 2672 JVM_END 2673 2674 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2675 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2676 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2677 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2678 return method->name()->as_utf8(); 2679 JVM_END 2680 2681 2682 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2683 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2684 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2685 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2686 return method->signature()->as_utf8(); 2687 JVM_END 2688 2689 /** 2690 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2691 * read entries in the constant pool. Since the old verifier always 2692 * works on a copy of the code, it will not see any rewriting that 2693 * may possibly occur in the middle of verification. So it is important 2694 * that nothing it calls tries to use the cpCache instead of the raw 2695 * constant pool, so we must use cp->uncached_x methods when appropriate. 2696 */ 2697 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2698 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2699 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2700 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2701 switch (cp->tag_at(cp_index).value()) { 2702 case JVM_CONSTANT_Fieldref: 2703 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2704 default: 2705 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2706 } 2707 ShouldNotReachHere(); 2708 return nullptr; 2709 JVM_END 2710 2711 2712 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2713 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2714 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2715 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2716 switch (cp->tag_at(cp_index).value()) { 2717 case JVM_CONSTANT_InterfaceMethodref: 2718 case JVM_CONSTANT_Methodref: 2719 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2720 default: 2721 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2722 } 2723 ShouldNotReachHere(); 2724 return nullptr; 2725 JVM_END 2726 2727 2728 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2729 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2730 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2731 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2732 switch (cp->tag_at(cp_index).value()) { 2733 case JVM_CONSTANT_InterfaceMethodref: 2734 case JVM_CONSTANT_Methodref: 2735 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2736 default: 2737 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2738 } 2739 ShouldNotReachHere(); 2740 return nullptr; 2741 JVM_END 2742 2743 2744 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2745 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2746 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2747 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2748 switch (cp->tag_at(cp_index).value()) { 2749 case JVM_CONSTANT_Fieldref: 2750 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2751 default: 2752 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2753 } 2754 ShouldNotReachHere(); 2755 return nullptr; 2756 JVM_END 2757 2758 2759 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2760 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2761 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2762 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2763 Symbol* classname = cp->klass_name_at(cp_index); 2764 return classname->as_utf8(); 2765 JVM_END 2766 2767 2768 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2769 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2770 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2771 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2772 switch (cp->tag_at(cp_index).value()) { 2773 case JVM_CONSTANT_Fieldref: { 2774 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2775 Symbol* classname = cp->klass_name_at(class_index); 2776 return classname->as_utf8(); 2777 } 2778 default: 2779 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2780 } 2781 ShouldNotReachHere(); 2782 return nullptr; 2783 JVM_END 2784 2785 2786 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2787 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2788 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2789 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2790 switch (cp->tag_at(cp_index).value()) { 2791 case JVM_CONSTANT_Methodref: 2792 case JVM_CONSTANT_InterfaceMethodref: { 2793 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2794 Symbol* classname = cp->klass_name_at(class_index); 2795 return classname->as_utf8(); 2796 } 2797 default: 2798 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2799 } 2800 ShouldNotReachHere(); 2801 return nullptr; 2802 JVM_END 2803 2804 2805 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2806 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2807 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2808 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2809 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2810 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2811 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2812 switch (cp->tag_at(cp_index).value()) { 2813 case JVM_CONSTANT_Fieldref: { 2814 Symbol* name = cp->uncached_name_ref_at(cp_index); 2815 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2816 InstanceKlass* ik = InstanceKlass::cast(k_called); 2817 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2818 if (fs.name() == name && fs.signature() == signature) { 2819 return fs.access_flags().as_field_flags(); 2820 } 2821 } 2822 return -1; 2823 } 2824 default: 2825 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2826 } 2827 ShouldNotReachHere(); 2828 return 0; 2829 JVM_END 2830 2831 2832 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2833 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2834 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2835 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2836 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2837 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2838 switch (cp->tag_at(cp_index).value()) { 2839 case JVM_CONSTANT_Methodref: 2840 case JVM_CONSTANT_InterfaceMethodref: { 2841 Symbol* name = cp->uncached_name_ref_at(cp_index); 2842 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2843 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2844 int methods_count = methods->length(); 2845 for (int i = 0; i < methods_count; i++) { 2846 Method* method = methods->at(i); 2847 if (method->name() == name && method->signature() == signature) { 2848 return method->access_flags().as_method_flags(); 2849 } 2850 } 2851 return -1; 2852 } 2853 default: 2854 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2855 } 2856 ShouldNotReachHere(); 2857 return 0; 2858 JVM_END 2859 2860 2861 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2862 2863 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2864 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2865 JVM_END 2866 2867 2868 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2869 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2870 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2871 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2872 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2873 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2874 JVM_END 2875 2876 // Printing support ////////////////////////////////////////////////// 2877 extern "C" { 2878 2879 ATTRIBUTE_PRINTF(3, 0) 2880 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2881 // Reject count values that are negative signed values converted to 2882 // unsigned; see bug 4399518, 4417214 2883 if ((intptr_t)count <= 0) return -1; 2884 2885 int result = os::vsnprintf(str, count, fmt, args); 2886 if (result > 0 && (size_t)result >= count) { 2887 result = -1; 2888 } 2889 2890 return result; 2891 } 2892 2893 ATTRIBUTE_PRINTF(3, 4) 2894 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2895 va_list args; 2896 int len; 2897 va_start(args, fmt); 2898 len = jio_vsnprintf(str, count, fmt, args); 2899 va_end(args); 2900 return len; 2901 } 2902 2903 ATTRIBUTE_PRINTF(2, 3) 2904 int jio_fprintf(FILE* f, const char *fmt, ...) { 2905 int len; 2906 va_list args; 2907 va_start(args, fmt); 2908 len = jio_vfprintf(f, fmt, args); 2909 va_end(args); 2910 return len; 2911 } 2912 2913 ATTRIBUTE_PRINTF(2, 0) 2914 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2915 if (Arguments::vfprintf_hook() != nullptr) { 2916 return Arguments::vfprintf_hook()(f, fmt, args); 2917 } else { 2918 return vfprintf(f, fmt, args); 2919 } 2920 } 2921 2922 ATTRIBUTE_PRINTF(1, 2) 2923 JNIEXPORT int jio_printf(const char *fmt, ...) { 2924 int len; 2925 va_list args; 2926 va_start(args, fmt); 2927 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2928 va_end(args); 2929 return len; 2930 } 2931 2932 // HotSpot specific jio method 2933 void jio_print(const char* s, size_t len) { 2934 // Try to make this function as atomic as possible. 2935 if (Arguments::vfprintf_hook() != nullptr) { 2936 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2937 } else { 2938 // Make an unused local variable to avoid warning from gcc compiler. 2939 bool dummy = os::write(defaultStream::output_fd(), s, len); 2940 } 2941 } 2942 2943 } // Extern C 2944 2945 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2946 2947 // In most of the JVM thread support functions we need to access the 2948 // thread through a ThreadsListHandle to prevent it from exiting and 2949 // being reclaimed while we try to operate on it. The exceptions to this 2950 // rule are when operating on the current thread, or if the monitor of 2951 // the target java.lang.Thread is locked at the Java level - in both 2952 // cases the target cannot exit. 2953 2954 static void thread_entry(JavaThread* thread, TRAPS) { 2955 HandleMark hm(THREAD); 2956 Handle obj(THREAD, thread->threadObj()); 2957 JavaValue result(T_VOID); 2958 JavaCalls::call_virtual(&result, 2959 obj, 2960 vmClasses::Thread_klass(), 2961 vmSymbols::run_method_name(), 2962 vmSymbols::void_method_signature(), 2963 THREAD); 2964 } 2965 2966 2967 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2968 #if INCLUDE_CDS 2969 if (CDSConfig::allow_only_single_java_thread()) { 2970 // During java -Xshare:dump, if we allow multiple Java threads to 2971 // execute in parallel, symbols and classes may be loaded in 2972 // random orders which will make the resulting CDS archive 2973 // non-deterministic. 2974 // 2975 // Lucikly, during java -Xshare:dump, it's important to run only 2976 // the code in the main Java thread (which is NOT started here) that 2977 // creates the module graph, etc. It's safe to not start the other 2978 // threads which are launched by class static initializers 2979 // (ReferenceHandler, FinalizerThread and CleanerImpl). 2980 if (log_is_enabled(Info, cds)) { 2981 ResourceMark rm; 2982 oop t = JNIHandles::resolve_non_null(jthread); 2983 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 2984 } 2985 return; 2986 } 2987 #endif 2988 JavaThread *native_thread = nullptr; 2989 2990 // We cannot hold the Threads_lock when we throw an exception, 2991 // due to rank ordering issues. Example: we might need to grab the 2992 // Heap_lock while we construct the exception. 2993 bool throw_illegal_thread_state = false; 2994 2995 // We must release the Threads_lock before we can post a jvmti event 2996 // in Thread::start. 2997 { 2998 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock); 2999 // Ensure that the C++ Thread and OSThread structures aren't freed before 3000 // we operate. 3001 MutexLocker ml(Threads_lock); 3002 3003 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 3004 // re-starting an already started thread, so we should usually find 3005 // that the JavaThread is null. However for a JNI attached thread 3006 // there is a small window between the Thread object being created 3007 // (with its JavaThread set) and the update to its threadStatus, so we 3008 // have to check for this 3009 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 3010 throw_illegal_thread_state = true; 3011 } else { 3012 jlong size = 3013 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 3014 // Allocate the C++ Thread structure and create the native thread. The 3015 // stack size retrieved from java is 64-bit signed, but the constructor takes 3016 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 3017 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 3018 // - Avoid passing negative values which would result in really large stacks. 3019 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 3020 size_t sz = size > 0 ? (size_t) size : 0; 3021 native_thread = new JavaThread(&thread_entry, sz); 3022 3023 // At this point it may be possible that no osthread was created for the 3024 // JavaThread due to lack of memory. Check for this situation and throw 3025 // an exception if necessary. Eventually we may want to change this so 3026 // that we only grab the lock if the thread was created successfully - 3027 // then we can also do this check and throw the exception in the 3028 // JavaThread constructor. 3029 if (native_thread->osthread() != nullptr) { 3030 // Note: the current thread is not being used within "prepare". 3031 native_thread->prepare(jthread); 3032 } 3033 } 3034 } 3035 3036 if (throw_illegal_thread_state) { 3037 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3038 } 3039 3040 assert(native_thread != nullptr, "Starting null thread?"); 3041 3042 if (native_thread->osthread() == nullptr) { 3043 ResourceMark rm(thread); 3044 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 3045 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 3046 // No one should hold a reference to the 'native_thread'. 3047 native_thread->smr_delete(); 3048 if (JvmtiExport::should_post_resource_exhausted()) { 3049 JvmtiExport::post_resource_exhausted( 3050 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3051 os::native_thread_creation_failed_msg()); 3052 } 3053 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3054 os::native_thread_creation_failed_msg()); 3055 } 3056 3057 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3058 3059 Thread::start(native_thread); 3060 3061 JVM_END 3062 3063 3064 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3065 ThreadsListHandle tlh(thread); 3066 oop java_thread = nullptr; 3067 JavaThread* receiver = nullptr; 3068 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3069 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3070 3071 if (is_alive) { 3072 // jthread refers to a live JavaThread. 3073 Thread::set_priority(receiver, (ThreadPriority)prio); 3074 } 3075 // Implied else: If the JavaThread hasn't started yet, then the 3076 // priority set in the java.lang.Thread object above will be pushed 3077 // down when it does start. 3078 JVM_END 3079 3080 3081 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3082 HOTSPOT_THREAD_YIELD(); 3083 os::naked_yield(); 3084 JVM_END 3085 3086 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos)) 3087 if (nanos < 0) { 3088 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range"); 3089 } 3090 3091 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3092 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3093 } 3094 3095 // Save current thread state and restore it at the end of this block. 3096 // And set new thread state to SLEEPING. 3097 JavaThreadSleepState jtss(thread); 3098 3099 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC); 3100 3101 if (nanos == 0) { 3102 os::naked_yield(); 3103 } else { 3104 ThreadState old_state = thread->osthread()->get_state(); 3105 thread->osthread()->set_state(SLEEPING); 3106 if (!thread->sleep_nanos(nanos)) { // interrupted 3107 // An asynchronous exception could have been thrown on 3108 // us while we were sleeping. We do not overwrite those. 3109 if (!HAS_PENDING_EXCEPTION) { 3110 HOTSPOT_THREAD_SLEEP_END(1); 3111 3112 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3113 // to properly restore the thread state. That's likely wrong. 3114 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3115 } 3116 } 3117 thread->osthread()->set_state(old_state); 3118 } 3119 HOTSPOT_THREAD_SLEEP_END(0); 3120 JVM_END 3121 3122 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3123 oop jthread = thread->threadObj(); 3124 assert(jthread != nullptr, "no current carrier thread!"); 3125 return JNIHandles::make_local(THREAD, jthread); 3126 JVM_END 3127 3128 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3129 oop theThread = thread->vthread(); 3130 assert(theThread != (oop)nullptr, "no current thread!"); 3131 return JNIHandles::make_local(THREAD, theThread); 3132 JVM_END 3133 3134 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3135 jobject theThread)) 3136 oop threadObj = JNIHandles::resolve(theThread); 3137 thread->set_vthread(threadObj); 3138 3139 // Set _monitor_owner_id of new current Thread 3140 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj)); 3141 3142 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3143 JVM_END 3144 3145 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3146 return ThreadIdentifier::unsafe_offset(); 3147 JVM_END 3148 3149 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3150 ThreadsListHandle tlh(thread); 3151 JavaThread* receiver = nullptr; 3152 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3153 if (is_alive) { 3154 // jthread refers to a live JavaThread. 3155 receiver->interrupt(); 3156 } 3157 JVM_END 3158 3159 // Return true iff the current thread has locked the object passed in 3160 3161 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3162 if (obj == nullptr) { 3163 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3164 } 3165 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3166 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3167 JVM_END 3168 3169 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3170 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD); 3171 return JNIHandles::make_local(THREAD, trace); 3172 JVM_END 3173 3174 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3175 // We don't use a ThreadsListHandle here because the current thread 3176 // must be alive. 3177 oop java_thread = JNIHandles::resolve_non_null(jthread); 3178 JavaThread* thr = java_lang_Thread::thread(java_thread); 3179 if (thread == thr && !thr->has_attached_via_jni()) { 3180 // Thread naming is only supported for the current thread and 3181 // we don't set the name of an attached thread to avoid stepping 3182 // on other programs. 3183 ResourceMark rm(thread); 3184 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3185 os::set_native_thread_name(thread_name); 3186 } 3187 JVM_END 3188 3189 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3190 oop theCache = thread->scopedValueCache(); 3191 return JNIHandles::make_local(THREAD, theCache); 3192 JVM_END 3193 3194 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3195 jobject theCache)) 3196 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3197 thread->set_scopedValueCache(objs); 3198 JVM_END 3199 3200 3201 // java.lang.Package //////////////////////////////////////////////////////////////// 3202 3203 3204 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3205 ResourceMark rm(THREAD); 3206 JvmtiVMObjectAllocEventCollector oam; 3207 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3208 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3209 return (jstring) JNIHandles::make_local(THREAD, result); 3210 JVM_END 3211 3212 3213 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3214 JvmtiVMObjectAllocEventCollector oam; 3215 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3216 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3217 JVM_END 3218 3219 3220 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3221 3222 3223 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3224 MonitorLocker ml(Heap_lock); 3225 oop ref = Universe::reference_pending_list(); 3226 if (ref != nullptr) { 3227 Universe::clear_reference_pending_list(); 3228 } 3229 return JNIHandles::make_local(THREAD, ref); 3230 JVM_END 3231 3232 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3233 MonitorLocker ml(Heap_lock); 3234 return Universe::has_reference_pending_list(); 3235 JVM_END 3236 3237 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3238 MonitorLocker ml(Heap_lock); 3239 while (!Universe::has_reference_pending_list()) { 3240 ml.wait(); 3241 } 3242 JVM_END 3243 3244 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3245 oop ref_oop = JNIHandles::resolve_non_null(ref); 3246 // PhantomReference has it's own implementation of refersTo(). 3247 // See: JVM_PhantomReferenceRefersTo 3248 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3249 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3250 return referent == JNIHandles::resolve(o); 3251 JVM_END 3252 3253 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3254 oop ref_oop = JNIHandles::resolve_non_null(ref); 3255 // FinalReference has it's own implementation of clear(). 3256 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3257 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3258 // If the referent has already been cleared then done. 3259 // However, if the referent is dead but has not yet been cleared by 3260 // concurrent reference processing, it should NOT be cleared here. 3261 // Instead, clearing should be left to the GC. Clearing it here could 3262 // detectably lose an expected notification, which is impossible with 3263 // STW reference processing. The clearing in enqueue() doesn't have 3264 // this problem, since the enqueue covers the notification, but it's not 3265 // worth the effort to handle that case specially. 3266 return; 3267 } 3268 java_lang_ref_Reference::clear_referent(ref_oop); 3269 JVM_END 3270 3271 3272 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3273 3274 3275 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3276 oop ref_oop = JNIHandles::resolve_non_null(ref); 3277 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3278 return referent == JNIHandles::resolve(o); 3279 JVM_END 3280 3281 3282 // ObjectInputStream /////////////////////////////////////////////////////////////// 3283 3284 // Return the first user-defined class loader up the execution stack, or null 3285 // if only code from the bootstrap or platform class loader is on the stack. 3286 3287 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3288 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3289 InstanceKlass* ik = vfst.method()->method_holder(); 3290 oop loader = ik->class_loader(); 3291 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3292 return JNIHandles::make_local(THREAD, loader); 3293 } 3294 } 3295 return nullptr; 3296 JVM_END 3297 3298 3299 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3300 3301 3302 // resolve array handle and check arguments 3303 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3304 if (arr == nullptr) { 3305 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3306 } 3307 oop a = JNIHandles::resolve_non_null(arr); 3308 if (!a->is_array()) { 3309 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3310 } else if (type_array_only && !a->is_typeArray()) { 3311 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3312 } 3313 return arrayOop(a); 3314 } 3315 3316 3317 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3318 arrayOop a = check_array(env, arr, false, CHECK_0); 3319 return a->length(); 3320 JVM_END 3321 3322 3323 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3324 JvmtiVMObjectAllocEventCollector oam; 3325 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3326 jvalue value; 3327 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3328 oop box = Reflection::box(&value, type, CHECK_NULL); 3329 return JNIHandles::make_local(THREAD, box); 3330 JVM_END 3331 3332 3333 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3334 jvalue value; 3335 value.i = 0; // to initialize value before getting used in CHECK 3336 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3337 assert(a->is_typeArray(), "just checking"); 3338 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3339 BasicType wide_type = (BasicType) wCode; 3340 if (type != wide_type) { 3341 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3342 } 3343 return value; 3344 JVM_END 3345 3346 3347 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3348 arrayOop a = check_array(env, arr, false, CHECK); 3349 oop box = JNIHandles::resolve(val); 3350 jvalue value; 3351 value.i = 0; // to initialize value before getting used in CHECK 3352 BasicType value_type; 3353 if (a->is_objArray()) { 3354 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3355 value_type = Reflection::unbox_for_regular_object(box, &value); 3356 } else { 3357 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3358 } 3359 Reflection::array_set(&value, a, index, value_type, CHECK); 3360 JVM_END 3361 3362 3363 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3364 arrayOop a = check_array(env, arr, true, CHECK); 3365 assert(a->is_typeArray(), "just checking"); 3366 BasicType value_type = (BasicType) vCode; 3367 Reflection::array_set(&v, a, index, value_type, CHECK); 3368 JVM_END 3369 3370 3371 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3372 JvmtiVMObjectAllocEventCollector oam; 3373 oop element_mirror = JNIHandles::resolve(eltClass); 3374 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3375 return JNIHandles::make_local(THREAD, result); 3376 JVM_END 3377 3378 3379 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3380 JvmtiVMObjectAllocEventCollector oam; 3381 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3382 oop element_mirror = JNIHandles::resolve(eltClass); 3383 assert(dim_array->is_typeArray(), "just checking"); 3384 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3385 return JNIHandles::make_local(THREAD, result); 3386 JVM_END 3387 3388 3389 // Library support /////////////////////////////////////////////////////////////////////////// 3390 3391 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3392 return ZipLibrary::handle(); 3393 JVM_END 3394 3395 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3396 //%note jvm_ct 3397 char ebuf[1024]; 3398 void *load_result; 3399 { 3400 ThreadToNativeFromVM ttnfvm(thread); 3401 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3402 } 3403 if (load_result == nullptr) { 3404 if (throwException) { 3405 char msg[1024]; 3406 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3407 // Since 'ebuf' may contain a string encoded using 3408 // platform encoding scheme, we need to pass 3409 // Exceptions::unsafe_to_utf8 to the new_exception method 3410 // as the last argument. See bug 6367357. 3411 Handle h_exception = 3412 Exceptions::new_exception(thread, 3413 vmSymbols::java_lang_UnsatisfiedLinkError(), 3414 msg, Exceptions::unsafe_to_utf8); 3415 3416 THROW_HANDLE_NULL(h_exception); 3417 } else { 3418 log_info(library)("Failed to load library %s", name); 3419 return load_result; 3420 } 3421 } 3422 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3423 return load_result; 3424 JVM_END 3425 3426 3427 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3428 os::dll_unload(handle); 3429 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3430 JVM_END 3431 3432 3433 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3434 void* find_result = os::dll_lookup(handle, name); 3435 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3436 find_result != nullptr ? "Found" : "Failed to find", 3437 name, p2i(handle)); 3438 return find_result; 3439 JVM_END 3440 3441 3442 // JNI version /////////////////////////////////////////////////////////////////////////////// 3443 3444 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3445 return Threads::is_supported_jni_version_including_1_1(version); 3446 JVM_END 3447 3448 3449 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3450 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3451 JVM_END 3452 3453 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void)) 3454 return EnableValhalla ? JNI_TRUE : JNI_FALSE; 3455 JVM_END 3456 3457 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3458 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3459 JVM_END 3460 3461 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void)) 3462 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE; 3463 JVM_END 3464 3465 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void)) 3466 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE; 3467 JVM_END 3468 3469 // String support /////////////////////////////////////////////////////////////////////////// 3470 3471 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3472 JvmtiVMObjectAllocEventCollector oam; 3473 if (str == nullptr) return nullptr; 3474 oop string = JNIHandles::resolve_non_null(str); 3475 oop result = StringTable::intern(string, CHECK_NULL); 3476 return (jstring) JNIHandles::make_local(THREAD, result); 3477 JVM_END 3478 3479 3480 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3481 3482 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3483 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3484 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3485 // in the safepoint protocol, thread suspension, thread interruption, or most things of that 3486 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has 3487 // shutdown. JavaThreads will be "in native" when using this API from JDK code. 3488 3489 3490 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3491 VM_Exit::block_if_vm_exited(); 3492 return new PlatformMutex(); 3493 } 3494 3495 3496 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3497 VM_Exit::block_if_vm_exited(); 3498 delete ((PlatformMutex*) mon); 3499 } 3500 3501 3502 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3503 VM_Exit::block_if_vm_exited(); 3504 ((PlatformMutex*) mon)->lock(); 3505 return 0; 3506 } 3507 3508 3509 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3510 VM_Exit::block_if_vm_exited(); 3511 ((PlatformMutex*) mon)->unlock(); 3512 } 3513 3514 3515 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3516 3517 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3518 Handle loader, jboolean throwError, TRAPS) { 3519 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL); 3520 3521 // Check if we should initialize the class 3522 if (init && klass->is_instance_klass()) { 3523 klass->initialize(CHECK_NULL); 3524 } 3525 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3526 } 3527 3528 3529 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3530 3531 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3532 Handle method_handle; 3533 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3534 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3535 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3536 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL); 3537 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3538 jobject res = JNIHandles::make_local(THREAD, result); 3539 if (JvmtiExport::should_post_vm_object_alloc()) { 3540 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3541 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3542 if (java_lang_Class::is_primitive(ret_type)) { 3543 // Only for primitive type vm allocates memory for java object. 3544 // See box() method. 3545 JvmtiExport::post_vm_object_alloc(thread, result); 3546 } 3547 } 3548 return res; 3549 } else { 3550 THROW_NULL(vmSymbols::java_lang_StackOverflowError()); 3551 } 3552 JVM_END 3553 3554 3555 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3556 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL); 3557 oop constructor_mirror = JNIHandles::resolve(c); 3558 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3559 jobject res = JNIHandles::make_local(THREAD, result); 3560 if (JvmtiExport::should_post_vm_object_alloc()) { 3561 JvmtiExport::post_vm_object_alloc(thread, result); 3562 } 3563 return res; 3564 JVM_END 3565 3566 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3567 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3568 assert(k->is_klass(), "just checking"); 3569 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3570 JVM_END 3571 3572 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3573 jclass caller, 3574 jstring interfaceMethodName, 3575 jobject factoryType, 3576 jobject interfaceMethodType, 3577 jobject implementationMember, 3578 jobject dynamicMethodType, 3579 jclass lambdaProxyClass)) 3580 #if INCLUDE_CDS 3581 if (!CDSConfig::is_dumping_archive()) { 3582 return; 3583 } 3584 3585 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3586 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3587 if (caller_ik->is_hidden()) { 3588 // Hidden classes not of type lambda proxy classes are currently not being archived. 3589 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3590 // registered for archiving. 3591 return; 3592 } 3593 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass)); 3594 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k); 3595 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3596 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3597 3598 Symbol* interface_method_name = nullptr; 3599 if (interfaceMethodName != nullptr) { 3600 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3601 } 3602 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3603 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3604 3605 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3606 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3607 3608 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3609 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3610 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3611 3612 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3613 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3614 3615 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3616 interface_method_type, m, dynamic_method_type, THREAD); 3617 #endif // INCLUDE_CDS 3618 JVM_END 3619 3620 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3621 jclass caller, 3622 jstring interfaceMethodName, 3623 jobject factoryType, 3624 jobject interfaceMethodType, 3625 jobject implementationMember, 3626 jobject dynamicMethodType)) 3627 #if INCLUDE_CDS 3628 3629 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3630 implementationMember == nullptr || dynamicMethodType == nullptr) { 3631 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3632 } 3633 3634 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3635 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3636 if (!caller_ik->is_shared()) { 3637 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3638 return nullptr; 3639 } 3640 3641 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3642 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3643 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3644 3645 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3646 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3647 3648 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3649 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3650 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3651 3652 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3653 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3654 3655 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3656 interface_method_type, m, dynamic_method_type); 3657 jclass jcls = nullptr; 3658 if (lambda_ik != nullptr) { 3659 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD); 3660 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3661 } 3662 return jcls; 3663 #else 3664 return nullptr; 3665 #endif // INCLUDE_CDS 3666 JVM_END 3667 3668 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3669 if (CDSConfig::is_dumping_static_archive()) { 3670 // We do this so that the default CDS archive can be deterministic. 3671 const char* release = VM_Version::vm_release(); 3672 const char* dbg_level = VM_Version::jdk_debug_level(); 3673 const char* version = VM_Version::internal_vm_info_string(); 3674 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3675 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3676 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3677 seed += (jlong)VM_Version::vm_major_version(); 3678 seed += (jlong)VM_Version::vm_minor_version(); 3679 seed += (jlong)VM_Version::vm_security_version(); 3680 seed += (jlong)VM_Version::vm_patch_version(); 3681 if (seed == 0) { // don't let this ever be zero. 3682 seed = 0x87654321; 3683 } 3684 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3685 return seed; 3686 } else { 3687 return 0; 3688 } 3689 JVM_END 3690 3691 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus()) 3692 return CDSConfig::get_status(); 3693 JVM_END 3694 3695 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3696 #if INCLUDE_CDS 3697 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity"); 3698 if (line != nullptr) { 3699 ResourceMark rm(THREAD); 3700 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3701 char* c_line = java_lang_String::as_utf8_string(h_line()); 3702 if (CDSConfig::is_dumping_dynamic_archive()) { 3703 // Note: LambdaFormInvokers::append take same format which is not 3704 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3705 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3706 } 3707 if (ClassListWriter::is_enabled()) { 3708 ClassListWriter w; 3709 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line); 3710 } 3711 } 3712 #endif // INCLUDE_CDS 3713 JVM_END 3714 3715 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3716 #if INCLUDE_CDS 3717 ResourceMark rm(THREAD); 3718 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3719 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3720 MetaspaceShared::dump_loaded_classes(file_name, THREAD); 3721 #endif // INCLUDE_CDS 3722 JVM_END 3723 3724 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3725 #if INCLUDE_CDS 3726 ResourceMark rm(THREAD); 3727 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3728 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3729 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3730 #endif // INCLUDE_CDS 3731 JVM_END 3732 3733 // Returns an array of all live Thread objects (VM internal JavaThreads, 3734 // jvmti agent threads, and JNI attaching threads are skipped) 3735 // See CR 6404306 regarding JNI attaching threads 3736 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3737 ResourceMark rm(THREAD); 3738 ThreadsListEnumerator tle(THREAD, false, false); 3739 JvmtiVMObjectAllocEventCollector oam; 3740 3741 int num_threads = tle.num_threads(); 3742 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3743 objArrayHandle threads_ah(THREAD, r); 3744 3745 for (int i = 0; i < num_threads; i++) { 3746 Handle h = tle.get_threadObj(i); 3747 threads_ah->obj_at_put(i, h()); 3748 } 3749 3750 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3751 JVM_END 3752 3753 3754 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3755 // Return StackTraceElement[][], each element is the stack trace of a thread in 3756 // the corresponding entry in the given threads array 3757 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3758 JvmtiVMObjectAllocEventCollector oam; 3759 3760 // Check if threads is null 3761 if (threads == nullptr) { 3762 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3763 } 3764 3765 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3766 objArrayHandle ah(THREAD, a); 3767 int num_threads = ah->length(); 3768 // check if threads is non-empty array 3769 if (num_threads == 0) { 3770 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3771 } 3772 3773 // check if threads is not an array of objects of Thread class 3774 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3775 if (k != vmClasses::Thread_klass()) { 3776 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3777 } 3778 3779 ResourceMark rm(THREAD); 3780 3781 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3782 for (int i = 0; i < num_threads; i++) { 3783 oop thread_obj = ah->obj_at(i); 3784 instanceHandle h(THREAD, (instanceOop) thread_obj); 3785 thread_handle_array->append(h); 3786 } 3787 3788 // The JavaThread references in thread_handle_array are validated 3789 // in VM_ThreadDump::doit(). 3790 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3791 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3792 3793 JVM_END 3794 3795 // JVM monitoring and management support 3796 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3797 return Management::get_jmm_interface(version); 3798 JVM_END 3799 3800 // com.sun.tools.attach.VirtualMachine agent properties support 3801 // 3802 // Initialize the agent properties with the properties maintained in the VM 3803 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3804 ResourceMark rm; 3805 3806 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3807 3808 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3809 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3810 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3811 return properties; 3812 JVM_END 3813 3814 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3815 { 3816 JvmtiVMObjectAllocEventCollector oam; 3817 3818 if (ofClass == nullptr) { 3819 return nullptr; 3820 } 3821 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3822 // Special handling for primitive objects 3823 if (java_lang_Class::is_primitive(mirror())) { 3824 return nullptr; 3825 } 3826 Klass* k = java_lang_Class::as_Klass(mirror()); 3827 if (!k->is_instance_klass()) { 3828 return nullptr; 3829 } 3830 InstanceKlass* ik = InstanceKlass::cast(k); 3831 int encl_method_class_idx = ik->enclosing_method_class_index(); 3832 if (encl_method_class_idx == 0) { 3833 return nullptr; 3834 } 3835 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3836 objArrayHandle dest(THREAD, dest_o); 3837 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3838 dest->obj_at_put(0, enc_k->java_mirror()); 3839 int encl_method_method_idx = ik->enclosing_method_method_index(); 3840 if (encl_method_method_idx != 0) { 3841 Symbol* sym = ik->constants()->symbol_at( 3842 extract_low_short_from_int( 3843 ik->constants()->name_and_type_at(encl_method_method_idx))); 3844 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3845 dest->obj_at_put(1, str()); 3846 sym = ik->constants()->symbol_at( 3847 extract_high_short_from_int( 3848 ik->constants()->name_and_type_at(encl_method_method_idx))); 3849 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3850 dest->obj_at_put(2, str()); 3851 } 3852 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3853 } 3854 JVM_END 3855 3856 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3857 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3858 ResourceMark rm(THREAD); 3859 3860 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3861 return nullptr; 3862 } 3863 3864 char** vm_flags = Arguments::jvm_flags_array(); 3865 char** vm_args = Arguments::jvm_args_array(); 3866 int num_flags = Arguments::num_jvm_flags(); 3867 int num_args = Arguments::num_jvm_args(); 3868 3869 InstanceKlass* ik = vmClasses::String_klass(); 3870 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3871 objArrayHandle result_h(THREAD, r); 3872 3873 int index = 0; 3874 for (int j = 0; j < num_flags; j++, index++) { 3875 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3876 result_h->obj_at_put(index, h()); 3877 } 3878 for (int i = 0; i < num_args; i++, index++) { 3879 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3880 result_h->obj_at_put(index, h()); 3881 } 3882 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 3883 JVM_END 3884 3885 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 3886 return os::get_signal_number(name); 3887 JVM_END 3888 3889 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread)) 3890 #if INCLUDE_JVMTI 3891 if (!DoJVMTIVirtualThreadTransitions) { 3892 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3893 return; 3894 } 3895 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3896 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread); 3897 } else { 3898 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3899 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false); 3900 } 3901 #endif 3902 JVM_END 3903 3904 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread)) 3905 #if INCLUDE_JVMTI 3906 if (!DoJVMTIVirtualThreadTransitions) { 3907 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3908 return; 3909 } 3910 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3911 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread); 3912 } else { 3913 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3914 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true); 3915 } 3916 #endif 3917 JVM_END 3918 3919 // If notifications are disabled then just update the VTMS transition bit and return. 3920 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call. 3921 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide)) 3922 #if INCLUDE_JVMTI 3923 if (!DoJVMTIVirtualThreadTransitions) { 3924 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3925 return; 3926 } 3927 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3928 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide); 3929 } else { 3930 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3931 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 3932 } 3933 #endif 3934 JVM_END 3935 3936 // If notifications are disabled then just update the VTMS transition bit and return. 3937 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below. 3938 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide)) 3939 #if INCLUDE_JVMTI 3940 if (!DoJVMTIVirtualThreadTransitions) { 3941 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3942 return; 3943 } 3944 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3945 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide); 3946 } else { 3947 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3948 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 3949 } 3950 #endif 3951 JVM_END 3952 3953 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section. 3954 // Needed to avoid deadlocks with JVMTI suspend mechanism. 3955 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter)) 3956 #if INCLUDE_JVMTI 3957 if (!DoJVMTIVirtualThreadTransitions) { 3958 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3959 return; 3960 } 3961 assert(thread->is_disable_suspend() != (bool)enter, 3962 "nested or unbalanced monitor enter/exit is not allowed"); 3963 thread->toggle_is_disable_suspend(); 3964 #endif 3965 JVM_END 3966 3967 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op)) 3968 #if INCLUDE_JFR 3969 freeze_result result = THREAD->last_freeze_fail_result(); 3970 assert(result != freeze_ok, "sanity check"); 3971 EventVirtualThreadPinned event(UNTIMED); 3972 event.set_starttime(THREAD->last_freeze_fail_time()); 3973 if (event.should_commit()) { 3974 ResourceMark rm(THREAD); 3975 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op)); 3976 THREAD->post_vthread_pinned_event(&event, str, result); 3977 } 3978 #endif 3979 JVM_END 3980 3981 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored)) 3982 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent(); 3983 assert(parkEvent != nullptr, "not initialized"); 3984 3985 OopHandle& list_head = ObjectMonitor::vthread_cxq_head(); 3986 oop vthread_head = nullptr; 3987 while (true) { 3988 if (list_head.peek() != nullptr) { 3989 for (;;) { 3990 oop head = list_head.resolve(); 3991 if (list_head.cmpxchg(head, nullptr) == head) { 3992 return JNIHandles::make_local(THREAD, head); 3993 } 3994 } 3995 } 3996 ThreadBlockInVM tbivm(THREAD); 3997 parkEvent->park(); 3998 } 3999 JVM_END 4000 /* 4001 * Return the current class's class file version. The low order 16 bits of the 4002 * returned jint contain the class's major version. The high order 16 bits 4003 * contain the class's minor version. 4004 */ 4005 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 4006 oop mirror = JNIHandles::resolve_non_null(current); 4007 if (java_lang_Class::is_primitive(mirror)) { 4008 // return latest major version and minor version of 0. 4009 return JVM_CLASSFILE_MAJOR_VERSION; 4010 } 4011 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class"); 4012 4013 Klass* c = java_lang_Class::as_Klass(mirror); 4014 assert(c->is_instance_klass(), "must be"); 4015 InstanceKlass* ik = InstanceKlass::cast(c); 4016 return (ik->minor_version() << 16) | ik->major_version(); 4017 JVM_END 4018 4019 /* 4020 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 4021 * get the value will see a materialized value and not a scalar-replaced 4022 * null value. 4023 */ 4024 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 4025 JVM_EnsureMaterializedForStackWalk(env, value); 4026 JVM_END 4027 4028 /* 4029 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded. 4030 */ 4031 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void)) 4032 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE; 4033 JVM_END