1 /* 2 * Copyright (c) 1997, 2026, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "cds/aotClassInitializer.hpp" 26 #include "cds/aotMetaspace.hpp" 27 #include "cds/cdsConfig.hpp" 28 #include "cds/classListParser.hpp" 29 #include "cds/classListWriter.hpp" 30 #include "cds/dynamicArchive.hpp" 31 #include "cds/heapShared.hpp" 32 #include "cds/lambdaFormInvokers.hpp" 33 #include "cds/lambdaProxyClassDictionary.hpp" 34 #include "classfile/classFileStream.hpp" 35 #include "classfile/classLoader.inline.hpp" 36 #include "classfile/classLoaderData.inline.hpp" 37 #include "classfile/classLoadInfo.hpp" 38 #include "classfile/javaAssertions.hpp" 39 #include "classfile/javaClasses.inline.hpp" 40 #include "classfile/moduleEntry.hpp" 41 #include "classfile/modules.hpp" 42 #include "classfile/packageEntry.hpp" 43 #include "classfile/stringTable.hpp" 44 #include "classfile/symbolTable.hpp" 45 #include "classfile/systemDictionary.hpp" 46 #include "classfile/vmClasses.hpp" 47 #include "classfile/vmSymbols.hpp" 48 #include "gc/shared/collectedHeap.inline.hpp" 49 #include "interpreter/bytecode.hpp" 50 #include "interpreter/bytecodeUtils.hpp" 51 #include "jfr/jfrEvents.hpp" 52 #include "jvm.h" 53 #include "logging/log.hpp" 54 #include "memory/oopFactory.hpp" 55 #include "memory/referenceType.hpp" 56 #include "memory/resourceArea.hpp" 57 #include "memory/universe.hpp" 58 #include "oops/access.inline.hpp" 59 #include "oops/constantPool.hpp" 60 #include "oops/fieldStreams.inline.hpp" 61 #include "oops/flatArrayKlass.hpp" 62 #include "oops/inlineKlass.inline.hpp" 63 #include "oops/instanceKlass.hpp" 64 #include "oops/klass.inline.hpp" 65 #include "oops/method.hpp" 66 #include "oops/objArrayKlass.hpp" 67 #include "oops/objArrayOop.inline.hpp" 68 #include "oops/oop.inline.hpp" 69 #include "oops/oopCast.inline.hpp" 70 #include "oops/recordComponent.hpp" 71 #include "oops/refArrayOop.inline.hpp" 72 #include "oops/valuePayload.inline.hpp" 73 #include "prims/foreignGlobals.hpp" 74 #include "prims/jvm_misc.hpp" 75 #include "prims/jvmtiExport.hpp" 76 #include "prims/jvmtiThreadState.inline.hpp" 77 #include "prims/stackwalk.hpp" 78 #include "runtime/arguments.hpp" 79 #include "runtime/atomicAccess.hpp" 80 #include "runtime/continuation.hpp" 81 #include "runtime/deoptimization.hpp" 82 #include "runtime/globals_extension.hpp" 83 #include "runtime/handles.inline.hpp" 84 #include "runtime/handshake.hpp" 85 #include "runtime/init.hpp" 86 #include "runtime/interfaceSupport.inline.hpp" 87 #include "runtime/java.hpp" 88 #include "runtime/javaCalls.hpp" 89 #include "runtime/javaThread.hpp" 90 #include "runtime/jfieldIDWorkaround.hpp" 91 #include "runtime/jniHandles.inline.hpp" 92 #include "runtime/mountUnmountDisabler.hpp" 93 #include "runtime/os.inline.hpp" 94 #include "runtime/osThread.hpp" 95 #include "runtime/perfData.hpp" 96 #include "runtime/reflection.hpp" 97 #include "runtime/synchronizer.hpp" 98 #include "runtime/threadIdentifier.hpp" 99 #include "runtime/threadSMR.hpp" 100 #include "runtime/vframe.inline.hpp" 101 #include "runtime/vm_version.hpp" 102 #include "runtime/vmOperations.hpp" 103 #include "services/attachListener.hpp" 104 #include "services/management.hpp" 105 #include "services/threadService.hpp" 106 #include "utilities/checkedCast.hpp" 107 #include "utilities/copy.hpp" 108 #include "utilities/defaultStream.hpp" 109 #include "utilities/dtrace.hpp" 110 #include "utilities/events.hpp" 111 #include "utilities/macros.hpp" 112 #include "utilities/utf8.hpp" 113 #include "utilities/zipLibrary.hpp" 114 #if INCLUDE_CDS 115 #include "classfile/systemDictionaryShared.hpp" 116 #endif 117 #if INCLUDE_JFR 118 #include "jfr/jfr.hpp" 119 #endif 120 #if INCLUDE_MANAGEMENT 121 #include "services/finalizerService.hpp" 122 #endif 123 124 #include <errno.h> 125 126 /* 127 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 128 such ctors and calls MUST NOT come between an oop declaration/init and its 129 usage because if objects are move this may cause various memory stomps, bus 130 errors and segfaults. Here is a cookbook for causing so called "naked oop 131 failures": 132 133 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 134 // Object address to be held directly in mirror & not visible to GC 135 oop mirror = JNIHandles::resolve_non_null(ofClass); 136 137 // If this ctor can hit a safepoint, moving objects around, then 138 ComplexConstructor foo; 139 140 // Boom! mirror may point to JUNK instead of the intended object 141 (some dereference of mirror) 142 143 // Here's another call that may block for GC, making mirror stale 144 MutexLocker ml(some_lock); 145 146 // And here's an initializer that can result in a stale oop 147 // all in one step. 148 oop o = call_that_can_throw_exception(TRAPS); 149 150 151 The solution is to keep the oop declaration BELOW the ctor or function 152 call that might cause a GC, do another resolve to reassign the oop, or 153 consider use of a Handle instead of an oop so there is immunity from object 154 motion. But note that the "QUICK" entries below do not have a handlemark 155 and thus can only support use of handles passed in. 156 */ 157 158 extern void trace_class_resolution(Klass* to_class) { 159 ResourceMark rm; 160 int line_number = -1; 161 const char * source_file = nullptr; 162 const char * trace = "explicit"; 163 InstanceKlass* caller = nullptr; 164 JavaThread* jthread = JavaThread::current(); 165 if (jthread->has_last_Java_frame()) { 166 vframeStream vfst(jthread); 167 168 // Scan up the stack skipping ClassLoader frames. 169 Method* last_caller = nullptr; 170 171 while (!vfst.at_end()) { 172 Method* m = vfst.method(); 173 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) { 174 break; 175 } 176 last_caller = m; 177 vfst.next(); 178 } 179 // if this is called from Class.forName0 and that is called from Class.forName, 180 // then print the caller of Class.forName. If this is Class.loadClass, then print 181 // that caller, otherwise keep quiet since this should be picked up elsewhere. 182 bool found_it = false; 183 if (!vfst.at_end() && 184 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 185 vfst.method()->name() == vmSymbols::forName0_name()) { 186 vfst.next(); 187 if (!vfst.at_end() && 188 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 189 vfst.method()->name() == vmSymbols::forName_name()) { 190 vfst.next(); 191 found_it = true; 192 } 193 } else if (last_caller != nullptr && 194 last_caller->method_holder()->name() == 195 vmSymbols::java_lang_ClassLoader() && 196 last_caller->name() == vmSymbols::loadClass_name()) { 197 found_it = true; 198 } else if (!vfst.at_end()) { 199 if (vfst.method()->is_native()) { 200 // JNI call 201 found_it = true; 202 } 203 } 204 if (found_it && !vfst.at_end()) { 205 // found the caller 206 caller = vfst.method()->method_holder(); 207 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 208 if (line_number == -1) { 209 // show method name if it's a native method 210 trace = vfst.method()->name_and_sig_as_C_string(); 211 } 212 Symbol* s = caller->source_file_name(); 213 if (s != nullptr) { 214 source_file = s->as_C_string(); 215 } 216 } 217 } 218 if (caller != nullptr) { 219 if (to_class != caller) { 220 const char * from = caller->external_name(); 221 const char * to = to_class->external_name(); 222 // print in a single call to reduce interleaving between threads 223 if (source_file != nullptr) { 224 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 225 } else { 226 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 227 } 228 } 229 } 230 } 231 232 // java.lang.System ////////////////////////////////////////////////////////////////////// 233 234 JVM_ENTRY(jboolean, JVM_AOTEndRecording(JNIEnv *env)) 235 #if INCLUDE_CDS 236 if (CDSConfig::is_dumping_preimage_static_archive()) { 237 if (!AOTMetaspace::preimage_static_archive_dumped()) { 238 AOTMetaspace::dump_static_archive(THREAD); 239 return JNI_TRUE; 240 } 241 } 242 return JNI_FALSE; 243 #else 244 return JNI_FALSE; 245 #endif // INCLUDE_CDS 246 JVM_END 247 248 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 249 return os::javaTimeMillis(); 250 JVM_END 251 252 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 253 return os::javaTimeNanos(); 254 JVM_END 255 256 // The function below is actually exposed by jdk.internal.misc.VM and not 257 // java.lang.System, but we choose to keep it here so that it stays next 258 // to JVM_CurrentTimeMillis and JVM_NanoTime 259 260 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 261 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 262 263 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 264 jlong seconds; 265 jlong nanos; 266 267 os::javaTimeSystemUTC(seconds, nanos); 268 269 // We're going to verify that the result can fit in a long. 270 // For that we need the difference in seconds between 'seconds' 271 // and 'offset_secs' to be such that: 272 // |seconds - offset_secs| < (2^63/10^9) 273 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 274 // which makes |seconds - offset_secs| < 2^33 275 // and we will prefer +/- 2^32 as the maximum acceptable diff 276 // as 2^32 has a more natural feel than 2^33... 277 // 278 // So if |seconds - offset_secs| >= 2^32 - we return a special 279 // sentinel value (-1) which the caller should take as an 280 // exception value indicating that the offset given to us is 281 // too far from range of the current time - leading to too big 282 // a nano adjustment. The caller is expected to recover by 283 // computing a more accurate offset and calling this method 284 // again. (For the record 2^32 secs is ~136 years, so that 285 // should rarely happen) 286 // 287 jlong diff = seconds - offset_secs; 288 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 289 return -1; // sentinel value: the offset is too far off the target 290 } 291 292 // return the adjustment. If you compute a time by adding 293 // this number of nanoseconds along with the number of seconds 294 // in the offset you should get the current UTC time. 295 return (diff * (jlong)1000000000) + nanos; 296 JVM_END 297 298 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 299 jobject dst, jint dst_pos, jint length)) 300 // Check if we have null pointers 301 if (src == nullptr || dst == nullptr) { 302 THROW(vmSymbols::java_lang_NullPointerException()); 303 } 304 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 305 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 306 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 307 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 308 // Do copy 309 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 310 JVM_END 311 312 313 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 314 JavaValue r(T_OBJECT); 315 // public synchronized Object put(Object key, Object value); 316 HandleMark hm(THREAD); 317 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 318 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK); 319 JavaCalls::call_virtual(&r, 320 props, 321 vmClasses::Properties_klass(), 322 vmSymbols::put_name(), 323 vmSymbols::object_object_object_signature(), 324 key_str, 325 value_str, 326 THREAD); 327 } 328 329 330 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 331 332 /* 333 * Return all of the system properties in a Java String array with alternating 334 * names and values from the jvm SystemProperty. 335 * Which includes some internal and all commandline -D defined properties. 336 */ 337 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 338 ResourceMark rm(THREAD); 339 HandleMark hm(THREAD); 340 int ndx = 0; 341 int fixedCount = 2; 342 343 SystemProperty* p = Arguments::system_properties(); 344 int count = Arguments::PropertyList_count(p); 345 346 // Allocate result String array 347 InstanceKlass* ik = vmClasses::String_klass(); 348 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 349 objArrayHandle result_h(THREAD, r); 350 351 while (p != nullptr) { 352 const char * key = p->key(); 353 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 354 const char * value = p->value(); 355 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 356 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), 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 p = p->next(); 362 } 363 364 // Convert the -XX:MaxDirectMemorySize= command line flag 365 // to the sun.nio.MaxDirectMemorySize property. 366 // Do this after setting user properties to prevent people 367 // from setting the value with a -D option, as requested. 368 // Leave empty if not supplied 369 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 370 char as_chars[256]; 371 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 372 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 373 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 374 result_h->obj_at_put(ndx * 2, key_str()); 375 result_h->obj_at_put(ndx * 2 + 1, value_str()); 376 ndx++; 377 } 378 379 // JVM monitoring and management support 380 // Add the sun.management.compiler property for the compiler's name 381 { 382 #undef CSIZE 383 #if defined(_LP64) 384 #define CSIZE "64-Bit " 385 #else 386 #define CSIZE 387 #endif // 64bit 388 389 #if COMPILER1_AND_COMPILER2 390 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 391 #else 392 #if defined(COMPILER1) 393 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 394 #elif defined(COMPILER2) 395 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 396 #else 397 const char* compiler_name = ""; 398 #endif // compilers 399 #endif // COMPILER1_AND_COMPILER2 400 401 if (*compiler_name != '\0' && 402 (Arguments::mode() != Arguments::_int)) { 403 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 404 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 405 result_h->obj_at_put(ndx * 2, key_str()); 406 result_h->obj_at_put(ndx * 2 + 1, value_str()); 407 ndx++; 408 } 409 } 410 411 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 412 JVM_END 413 414 415 /* 416 * Return the temporary directory that the VM uses for the attach 417 * and perf data files. 418 * 419 * It is important that this directory is well-known and the 420 * same for all VM instances. It cannot be affected by configuration 421 * variables such as java.io.tmpdir. 422 */ 423 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 424 HandleMark hm(THREAD); 425 const char* temp_dir = os::get_temp_directory(); 426 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 427 return (jstring) JNIHandles::make_local(THREAD, h()); 428 JVM_END 429 430 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to)) 431 oop o = JNIHandles::resolve_non_null(orig); 432 assert(o->is_array(), "Must be"); 433 objArrayOop dest = nullptr; 434 arrayOop org = (arrayOop)o; 435 arrayHandle oh(THREAD, org); 436 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass()); 437 int len = to - from; // length of the new array 438 assert(len >= 0, "Java caller checks that from <= to"); 439 int orig_length = org->length(); 440 if (ak->is_null_free_array_klass()) { 441 if ((len != 0) && (from >= orig_length || to > orig_length)) { 442 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements"); 443 } 444 } 445 446 if (ak->is_flatArray_klass()) { 447 FlatArrayKlass* const fak = FlatArrayKlass::cast(org->klass()); 448 dest = fak->allocate_instance(len, CHECK_NULL); 449 } else { 450 const ArrayProperties props = ArrayProperties::Default().with_null_restricted(ak->is_null_free_array_klass()); 451 InlineKlass* vk = InlineKlass::cast(ak->element_klass()); 452 dest = oopFactory::new_objArray(vk, len, props, CHECK_NULL); 453 } 454 455 objArrayHandle dh(THREAD, dest); 456 457 int copy_len = MIN2(to, orig_length) - MIN2(from, orig_length); 458 if (copy_len != 0) { 459 assert(!ak->is_null_free_array_klass() || copy_len == len, 460 "Failed to throw the IllegalArgumentException"); 461 ak->copy_array(oh(), from, dh(), 0, copy_len, CHECK_NULL); 462 // Null out values past the length of the copy 463 for (int i = copy_len; i < len; i++) { 464 dh()->obj_at_put(i, nullptr); 465 } 466 } else { 467 for (int i = 0; i < len; i++) { 468 assert(!dh()->is_null_free_array(), "Should have thrown an IAE above"); 469 dh()->obj_at_put(i, nullptr); 470 } 471 } 472 473 return (jarray) JNIHandles::make_local(THREAD, dh()); 474 475 JVM_END 476 477 #ifdef ASSERT 478 static void verify_array_arguments(jclass elmClass, jint len) { 479 assert(len >= 0, "Negative array length"); 480 assert(elmClass != nullptr, "Null element class"); 481 oop mirror = JNIHandles::resolve_non_null(elmClass); 482 Klass* klass = java_lang_Class::as_Klass(mirror); 483 assert(klass->is_inline_klass(), "Element class must be an inline class"); 484 } 485 #endif // ASSERT 486 487 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal)) 488 DEBUG_ONLY(verify_array_arguments(elmClass, len)); 489 oop mirror = JNIHandles::resolve_non_null(elmClass); 490 Klass* klass = java_lang_Class::as_Klass(mirror); 491 oop init = JNIHandles::resolve_non_null(initVal); 492 Handle init_h(THREAD, init); 493 assert(klass == init_h()->klass(), "Type mismatch between array and initial value"); 494 const ArrayProperties props = ArrayProperties::Default() 495 .with_null_restricted() 496 .with_non_atomic(); 497 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL); 498 for (int i = 0; i < len; i++) { 499 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ ); 500 } 501 return (jarray) JNIHandles::make_local(THREAD, array); 502 JVM_END 503 504 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal)) 505 DEBUG_ONLY(verify_array_arguments(elmClass, len);) 506 oop mirror = JNIHandles::resolve_non_null(elmClass); 507 Klass* klass = java_lang_Class::as_Klass(mirror); 508 oop init = JNIHandles::resolve_non_null(initVal); 509 Handle init_h(THREAD, init); 510 assert(klass == init_h()->klass(), "Type mismatch between array and initial value"); 511 const ArrayProperties props = ArrayProperties::Default().with_null_restricted(); 512 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL); 513 for (int i = 0; i < len; i++) { 514 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ ); 515 } 516 return (jarray) JNIHandles::make_local(THREAD, array); 517 JVM_END 518 519 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len)) 520 DEBUG_ONLY(verify_array_arguments(elmClass, len);) 521 oop mirror = JNIHandles::resolve_non_null(elmClass); 522 Klass* klass = java_lang_Class::as_Klass(mirror); 523 objArrayOop array = oopFactory::new_objArray(klass, len, ArrayProperties::Default(), CHECK_NULL); 524 return (jarray) JNIHandles::make_local(THREAD, array); 525 JVM_END 526 527 JVM_ENTRY(jarray, JVM_NewReferenceArray(JNIEnv *env, jclass elmClass, jint len)) 528 DEBUG_ONLY(verify_array_arguments(elmClass, len);) 529 oop mirror = JNIHandles::resolve_non_null(elmClass); 530 Klass* klass = java_lang_Class::as_Klass(mirror); 531 refArrayOop array = oopFactory::new_refArray(klass, len, ArrayProperties::Default(), CHECK_NULL); 532 return (jarray) JNIHandles::make_local(THREAD, array); 533 JVM_END 534 535 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jarray array)) 536 oop o = JNIHandles::resolve_non_null(array); 537 Klass* klass = o->klass(); 538 539 assert(klass->is_objArray_klass(), "Expects an object array"); 540 541 return klass->is_flatArray_klass(); 542 JVM_END 543 544 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jarray array)) 545 oop o = JNIHandles::resolve_non_null(array); 546 Klass* klass = o->klass(); 547 548 assert(klass->is_objArray_klass(), "Expects an object array"); 549 550 return klass->is_null_free_array_klass(); 551 JVM_END 552 553 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jarray array)) 554 // There are multiple cases where an array can/must support atomic access: 555 // - the array is a reference array 556 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or NULL_FREE_ATOMIC_FLAT 557 // - the array is flat and its component type is naturally atomic 558 oop o = JNIHandles::resolve_non_null(array); 559 Klass* klass = o->klass(); 560 561 assert(klass->is_objArray_klass(), "Expects an object array"); 562 563 if (klass->is_refArray_klass()) { 564 return true; 565 } 566 567 if (klass->is_flatArray_klass()) { 568 FlatArrayKlass* fak = FlatArrayKlass::cast(klass); 569 if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) { 570 return true; 571 } 572 bool is_null_free = !LayoutKindHelper::is_nullable_flat(fak->layout_kind()); 573 if (fak->element_klass()->is_naturally_atomic(is_null_free)) { 574 return true; 575 } 576 577 return false; 578 } 579 580 ShouldNotReachHere(); 581 JVM_END 582 583 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 584 585 extern volatile jint vm_created; 586 587 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 588 EventShutdown event; 589 if (event.should_commit()) { 590 event.set_reason("Shutdown requested from Java"); 591 event.commit(); 592 } 593 JVM_END 594 595 596 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 597 before_exit(thread, true); 598 vm_exit(code); 599 JVM_END 600 601 602 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 603 if (!DisableExplicitGC) { 604 EventSystemGC event; 605 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent); 606 Universe::heap()->collect(GCCause::_java_lang_system_gc); 607 event.commit(); 608 } 609 JVM_END 610 611 612 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 613 return Universe::heap()->millis_since_last_whole_heap_examined(); 614 JVM_END 615 616 617 static inline jlong convert_size_t_to_jlong(size_t val) { 618 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 619 NOT_LP64 (return (jlong)val;) 620 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 621 } 622 623 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 624 size_t n = Universe::heap()->capacity(); 625 return convert_size_t_to_jlong(n); 626 JVM_END 627 628 629 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 630 size_t n = Universe::heap()->unused(); 631 return convert_size_t_to_jlong(n); 632 JVM_END 633 634 635 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 636 size_t n = Universe::heap()->max_capacity(); 637 return convert_size_t_to_jlong(n); 638 JVM_END 639 640 641 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 642 return os::active_processor_count(); 643 JVM_END 644 645 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void)) 646 #ifdef LINUX 647 if (UseContainerSupport) { 648 return JNI_TRUE; 649 } 650 #endif 651 return JNI_FALSE; 652 JVM_END 653 654 JVM_LEAF(jboolean, JVM_IsContainerized(void)) 655 if (os::is_containerized()) { 656 return JNI_TRUE; 657 } 658 return JNI_FALSE; 659 JVM_END 660 661 // java.lang.Throwable ////////////////////////////////////////////////////// 662 663 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 664 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 665 java_lang_Throwable::fill_in_stack_trace(exception); 666 JVM_END 667 668 // java.lang.NullPointerException /////////////////////////////////////////// 669 670 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 671 if (!ShowCodeDetailsInExceptionMessages) return nullptr; 672 673 oop exc = JNIHandles::resolve_non_null(throwable); 674 675 Method* method; 676 int bci; 677 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 678 return nullptr; 679 } 680 if (method->is_native()) { 681 return nullptr; 682 } 683 684 stringStream ss; 685 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 686 if (ok) { 687 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 688 return (jstring) JNIHandles::make_local(THREAD, result); 689 } else { 690 return nullptr; 691 } 692 JVM_END 693 694 // java.lang.StackTraceElement ////////////////////////////////////////////// 695 696 697 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth)) 698 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace)); 699 refArrayOop st = refArrayOop(JNIHandles::resolve(elements)); 700 refArrayHandle stack_trace(THREAD, st); 701 // Fill in the allocated stack trace 702 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK); 703 JVM_END 704 705 706 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 707 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 708 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 709 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK); 710 JVM_END 711 712 713 // java.lang.StackWalker ////////////////////////////////////////////////////// 714 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj)) 715 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj)); 716 717 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr); 718 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr); 719 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info()); 720 if (!have_name) { 721 oop name = StringTable::intern(method->name(), CHECK); 722 java_lang_StackFrameInfo::set_name(stack_frame_info(), name); 723 } 724 if (!have_type) { 725 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK); 726 java_lang_StackFrameInfo::set_type(stack_frame_info(), type()); 727 } 728 JVM_END 729 730 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode, 731 jint skip_frames, jobject contScope, jobject cont, 732 jint buffer_size, jint start_index, jobjectArray frames)) 733 if (!thread->has_last_Java_frame()) { 734 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr); 735 } 736 737 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 738 Handle contScope_h(THREAD, JNIHandles::resolve(contScope)); 739 Handle cont_h(THREAD, JNIHandles::resolve(cont)); 740 // frames array is a ClassFrameInfo[] array when only getting caller reference, 741 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 742 // be null. 743 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames)); 744 refArrayHandle frames_array_h(THREAD, fa); 745 746 if (frames_array_h->length() < buffer_size) { 747 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr); 748 } 749 750 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h, 751 buffer_size, start_index, frames_array_h, CHECK_NULL); 752 return JNIHandles::make_local(THREAD, result); 753 JVM_END 754 755 756 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor, 757 jint last_batch_count, jint buffer_size, jint start_index, 758 jobjectArray frames)) 759 // frames array is a ClassFrameInfo[] array when only getting caller reference, 760 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 761 // be null. 762 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames)); 763 refArrayHandle frames_array_h(THREAD, fa); 764 765 if (frames_array_h->length() < buffer_size) { 766 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 767 } 768 769 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 770 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size, 771 start_index, frames_array_h, THREAD); 772 JVM_END 773 774 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont)) 775 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames)); 776 refArrayHandle frames_array_h(THREAD, fa); 777 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 778 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont)); 779 780 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD); 781 JVM_END 782 783 // java.lang.Object /////////////////////////////////////////////// 784 785 786 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 787 // as implemented in the classic virtual machine; return 0 if object is null 788 if (handle == nullptr) { 789 return 0; 790 } 791 oop obj = JNIHandles::resolve_non_null(handle); 792 if (Arguments::is_valhalla_enabled() && obj->klass()->is_inline_klass()) { 793 const intptr_t obj_identity_hash = obj->mark().hash(); 794 // Check if mark word contains hash code already. 795 // It is possible that the generated identity hash is 0, which is not 796 // distinct from the no_hash value. In such a case, the hash will be 797 // computed and set every time JVM_IHashCode is called. If that happens, 798 // the only consequence is losing out on the optimization. 799 if (obj_identity_hash != markWord::no_hash) { 800 return checked_cast<jint>(obj_identity_hash); 801 } 802 803 // Compute hash by calling ValueObjectMethods.valueObjectHashCode. 804 // The identity hash is invariantly immutable (see its JavaDoc comment). 805 JavaValue result(T_INT); 806 JavaCallArguments args; 807 Handle ho(THREAD, obj); 808 args.push_oop(ho); 809 methodHandle method(THREAD, Universe::value_object_hash_code_method()); 810 JavaCalls::call(&result, method, &args, THREAD); 811 Exceptions::wrap_exception_in_internal_error("Internal error in hashCode", CHECK_0); 812 813 const intptr_t identity_hash = result.get_jint(); 814 815 // We now have to set the hash via CAS. It's possible that this will race 816 // other threads. By our invariant of immutability, when there is a 817 // race, the identity hash code is going to be one of the following: 818 // a) 0, another thread updated other markWord bits; b) identity_hash set 819 // by another thread; or c) identity_hash set by the current thread. 820 // A nonzero identity hash code that is not the identity_hash computed 821 // earlier indicates a violation of the invariant. 822 markWord current_mark, old_mark, new_mark; 823 do { 824 current_mark = ho->mark(); 825 new_mark = current_mark.copy_set_hash(identity_hash); 826 old_mark = ho->cas_set_mark(new_mark, current_mark); 827 assert(old_mark.has_no_hash() || old_mark.hash() == new_mark.hash(), 828 "CAS identity hash invariant violated, expected=" INTPTR_FORMAT " actual=" INTPTR_FORMAT, 829 new_mark.hash(), 830 old_mark.hash()); 831 } while (old_mark != current_mark); 832 833 return checked_cast<jint>(new_mark.hash()); 834 } else { 835 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj)); 836 } 837 JVM_END 838 839 840 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 841 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 842 ObjectSynchronizer::wait(obj, ms, CHECK); 843 JVM_END 844 845 846 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 847 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 848 ObjectSynchronizer::notify(obj, CHECK); 849 JVM_END 850 851 852 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 853 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 854 ObjectSynchronizer::notifyall(obj, CHECK); 855 JVM_END 856 857 858 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 859 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 860 Klass* klass = obj->klass(); 861 JvmtiVMObjectAllocEventCollector oam; 862 863 #ifdef ASSERT 864 // Just checking that the cloneable flag is set correct 865 if (obj->is_array()) { 866 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 867 } else { 868 guarantee(obj->is_instance(), "should be instanceOop"); 869 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 870 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 871 } 872 #endif 873 874 // Check if class of obj supports the Cloneable interface. 875 // All arrays are considered to be cloneable (See JLS 20.1.5). 876 // All j.l.r.Reference classes are considered non-cloneable. 877 if (!klass->is_cloneable() || 878 (klass->is_instance_klass() && 879 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 880 ResourceMark rm(THREAD); 881 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 882 } 883 884 if (klass->is_inline_klass()) { 885 // Value instances have no identity, so return the current instance instead of allocating a new one 886 // Value classes cannot have finalizers, so the method can return immediately 887 return JNIHandles::make_local(THREAD, obj()); 888 } 889 890 // Make shallow object copy 891 const size_t size = obj->size(); 892 oop new_obj_oop = nullptr; 893 if (obj->is_array()) { 894 const int length = ((arrayOop)obj())->length(); 895 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 896 /* do_zero */ true, CHECK_NULL); 897 } else { 898 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 899 } 900 901 HeapAccess<>::clone(obj(), new_obj_oop, size); 902 903 Handle new_obj(THREAD, new_obj_oop); 904 // Caution: this involves a java upcall, so the clone should be 905 // "gc-robust" by this stage. 906 if (klass->has_finalizer()) { 907 assert(obj->is_instance(), "should be instanceOop"); 908 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 909 new_obj = Handle(THREAD, new_obj_oop); 910 } 911 912 return JNIHandles::make_local(THREAD, new_obj()); 913 JVM_END 914 915 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 916 917 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 918 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 919 JVM_END 920 921 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 922 return InstanceKlass::is_finalization_enabled(); 923 JVM_END 924 925 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 926 927 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 928 CONT_RegisterNativeMethods(env, cls); 929 JVM_END 930 931 // java.io.File /////////////////////////////////////////////////////////////// 932 933 JVM_LEAF(char*, JVM_NativePath(char* path)) 934 return os::native_path(path); 935 JVM_END 936 937 938 // Misc. class handling /////////////////////////////////////////////////////////// 939 940 941 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 942 // Getting the class of the caller frame. 943 // 944 // The call stack at this point looks something like this: 945 // 946 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ] 947 // [1] [ @CallerSensitive API.method ] 948 // [.] [ (skipped intermediate frames) ] 949 // [n] [ caller ] 950 vframeStream vfst(thread); 951 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 952 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 953 Method* m = vfst.method(); 954 assert(m != nullptr, "sanity"); 955 switch (n) { 956 case 0: 957 // This must only be called from Reflection.getCallerClass 958 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 959 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 960 } 961 // fall-through 962 case 1: 963 // Frame 0 and 1 must be caller sensitive. 964 if (!m->caller_sensitive()) { 965 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 966 } 967 break; 968 default: 969 if (!m->is_ignored_by_security_stack_walk()) { 970 // We have reached the desired frame; return the holder class. 971 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 972 } 973 break; 974 } 975 } 976 return nullptr; 977 JVM_END 978 979 980 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 981 oop mirror = nullptr; 982 BasicType t = name2type(utf); 983 if (t != T_ILLEGAL && !is_reference_type(t)) { 984 mirror = Universe::java_mirror(t); 985 } 986 if (mirror == nullptr) { 987 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 988 } else { 989 return (jclass) JNIHandles::make_local(THREAD, mirror); 990 } 991 JVM_END 992 993 994 // Returns a class loaded by the bootstrap class loader; or null 995 // if not found. ClassNotFoundException is not thrown. 996 // FindClassFromBootLoader is exported to the launcher for windows. 997 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 998 const char* name)) 999 // Java libraries should ensure that name is never null or illegal. 1000 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 1001 // It's impossible to create this class; the name cannot fit 1002 // into the constant pool. 1003 return nullptr; 1004 } 1005 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name"); 1006 1007 TempNewSymbol h_name = SymbolTable::new_symbol(name); 1008 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 1009 if (k == nullptr) { 1010 return nullptr; 1011 } 1012 1013 if (log_is_enabled(Debug, class, resolve)) { 1014 trace_class_resolution(k); 1015 } 1016 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1017 JVM_END 1018 1019 // Find a class with this name in this loader. 1020 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name, 1021 jboolean init, jobject loader)) 1022 TempNewSymbol h_name = 1023 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 1024 CHECK_NULL); 1025 1026 oop loader_oop = JNIHandles::resolve(loader); 1027 Handle h_loader(THREAD, loader_oop); 1028 1029 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 1030 false, THREAD); 1031 1032 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1033 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 1034 } 1035 return result; 1036 JVM_END 1037 1038 // Currently only called from the old verifier. 1039 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 1040 jboolean init, jclass from)) 1041 TempNewSymbol h_name = 1042 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 1043 CHECK_NULL); 1044 oop from_class_oop = JNIHandles::resolve(from); 1045 assert(from_class_oop != nullptr, "must be"); 1046 Klass* from_class = java_lang_Class::as_Klass(from_class_oop); 1047 assert(from_class != nullptr, "must be"); 1048 oop class_loader = from_class->class_loader(); 1049 1050 Handle h_loader(THREAD, class_loader); 1051 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread); 1052 1053 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 1054 // this function is generally only used for class loading during verification. 1055 ResourceMark rm; 1056 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name(); 1057 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name(); 1058 log_debug(class, resolve)("%s %s (verification)", from_name, to_name); 1059 } 1060 1061 #if INCLUDE_CDS 1062 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) { 1063 InstanceKlass* ik = InstanceKlass::cast(from_class); 1064 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name); 1065 } 1066 #endif 1067 1068 return result; 1069 JVM_END 1070 1071 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 1072 static jclass jvm_define_class_common(const char *name, 1073 jobject loader, const jbyte *buf, 1074 jsize len, jobject pd, const char *source, 1075 TRAPS) { 1076 if (source == nullptr) source = "__JVM_DefineClass__"; 1077 1078 JavaThread* jt = THREAD; 1079 1080 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 1081 ClassLoader::perf_define_appclass_selftime(), 1082 ClassLoader::perf_define_appclasses(), 1083 jt->get_thread_stat()->perf_recursion_counts_addr(), 1084 jt->get_thread_stat()->perf_timers_addr(), 1085 PerfClassTraceTime::DEFINE_CLASS); 1086 1087 if (UsePerfData) { 1088 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 1089 } 1090 1091 // Class resolution will get the class name from the .class stream if the name is null. 1092 TempNewSymbol class_name = name == nullptr ? nullptr : 1093 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1094 CHECK_NULL); 1095 1096 ResourceMark rm(THREAD); 1097 ClassFileStream st((u1*)buf, len, source); 1098 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 1099 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1100 ClassLoadInfo cl_info(protection_domain); 1101 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 1102 class_loader, 1103 cl_info, 1104 CHECK_NULL); 1105 1106 if (log_is_enabled(Debug, class, resolve)) { 1107 trace_class_resolution(k); 1108 } 1109 1110 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1111 } 1112 1113 enum { 1114 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 1115 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 1116 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 1117 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 1118 }; 1119 1120 /* 1121 * Define a class with the specified flags that indicates if it's a nestmate, 1122 * hidden, or strongly referenced from class loader. 1123 */ 1124 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 1125 const jbyte *buf, jsize len, jobject pd, 1126 jboolean init, int flags, jobject classData, TRAPS) { 1127 ResourceMark rm(THREAD); 1128 1129 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup)); 1130 // Lookup class must not be a primitive class (whose mirror has a null Klass*) 1131 if (lookup_k == nullptr) { 1132 // The error message is wrong. We come here only if lookup is a primitive class 1133 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1134 } 1135 1136 Handle class_loader (THREAD, lookup_k->class_loader()); 1137 1138 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 1139 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1140 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1141 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1142 1143 InstanceKlass* host_class = nullptr; 1144 if (is_nestmate) { 1145 host_class = lookup_k->nest_host(CHECK_NULL); 1146 } 1147 1148 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1149 name, 1150 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1151 is_nestmate ? host_class->external_name() : "", 1152 is_hidden ? "hidden" : "not hidden", 1153 is_strong ? "strong" : "weak", 1154 vm_annotations ? "with vm annotations" : "without vm annotation"); 1155 1156 if (!is_hidden) { 1157 // classData is only applicable for hidden classes 1158 if (classData != nullptr) { 1159 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1160 } 1161 if (is_nestmate) { 1162 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1163 } 1164 if (!is_strong) { 1165 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1166 } 1167 if (vm_annotations) { 1168 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1169 } 1170 if (flags != STRONG_LOADER_LINK) { 1171 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1172 err_msg("invalid flag 0x%x", flags)); 1173 } 1174 } 1175 1176 // Class resolution will get the class name from the .class stream if the name is null. 1177 TempNewSymbol class_name = name == nullptr ? nullptr : 1178 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1179 CHECK_NULL); 1180 1181 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1182 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1183 ClassFileStream st((u1*)buf, len, source); 1184 1185 InstanceKlass* ik = nullptr; 1186 if (!is_hidden) { 1187 ClassLoadInfo cl_info(protection_domain); 1188 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1189 class_loader, 1190 cl_info, 1191 CHECK_NULL); 1192 1193 if (log_is_enabled(Debug, class, resolve)) { 1194 trace_class_resolution(ik); 1195 } 1196 } else { // hidden 1197 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1198 ClassLoadInfo cl_info(protection_domain, 1199 host_class, 1200 classData_h, 1201 is_hidden, 1202 is_strong, 1203 vm_annotations); 1204 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1205 class_loader, 1206 cl_info, 1207 CHECK_NULL); 1208 1209 // The hidden class loader data has been artificially been kept alive to 1210 // this point. The mirror and any instances of this class have to keep 1211 // it alive afterwards. 1212 ik->class_loader_data()->dec_keep_alive_ref_count(); 1213 1214 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1215 ModuleEntry* module = ik->module(); 1216 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1217 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1218 module_name, 1219 ik->external_name(), 1220 host_class->external_name(), 1221 ik->is_hidden() ? "is hidden" : "is not hidden"); 1222 } 1223 } 1224 1225 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) { 1226 // non-hidden class or nestmate class must be in the same package as the Lookup class 1227 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages"); 1228 } 1229 1230 if (init) { 1231 ik->initialize(CHECK_NULL); 1232 } else { 1233 ik->link_class(CHECK_NULL); 1234 } 1235 1236 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1237 } 1238 1239 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1240 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1241 JVM_END 1242 1243 /* 1244 * Define a class with the specified lookup class. 1245 * lookup: Lookup class 1246 * name: the name of the class 1247 * buf: class bytes 1248 * len: length of class bytes 1249 * pd: protection domain 1250 * init: initialize the class 1251 * flags: properties of the class 1252 * classData: private static pre-initialized field 1253 */ 1254 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1255 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1256 1257 if (lookup == nullptr) { 1258 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1259 } 1260 1261 assert(buf != nullptr, "buf must not be null"); 1262 1263 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1264 JVM_END 1265 1266 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1267 1268 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1269 JVM_END 1270 1271 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1272 ResourceMark rm(THREAD); 1273 1274 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1275 char* str = java_lang_String::as_utf8_string(h_name()); 1276 1277 // Sanity check, don't expect null 1278 if (str == nullptr) return nullptr; 1279 1280 // Internalize the string, converting '.' to '/' in string. 1281 char* p = (char*)str; 1282 while (*p != '\0') { 1283 if (*p == '.') { 1284 *p = '/'; 1285 } 1286 p++; 1287 } 1288 1289 const int str_len = (int)(p - str); 1290 if (str_len > Symbol::max_length()) { 1291 // It's impossible to create this class; the name cannot fit 1292 // into the constant pool. 1293 return nullptr; 1294 } 1295 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1296 1297 // Security Note: 1298 // The Java level wrapper will perform the necessary security check allowing 1299 // us to pass the null as the initiating class loader. 1300 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1301 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader); 1302 #if INCLUDE_CDS 1303 if (k == nullptr) { 1304 // If the class is not already loaded, try to see if it's in the shared 1305 // archive for the current classloader (h_loader). 1306 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1307 } 1308 #endif 1309 return (k == nullptr) ? nullptr : 1310 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1311 JVM_END 1312 1313 // Module support ////////////////////////////////////////////////////////////////////////////// 1314 1315 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1316 jstring location, jobjectArray packages)) 1317 Handle h_module (THREAD, JNIHandles::resolve(module)); 1318 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1319 JVM_END 1320 1321 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1322 Handle h_module (THREAD, JNIHandles::resolve(module)); 1323 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1324 JVM_END 1325 1326 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1327 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1328 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1329 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1330 JVM_END 1331 1332 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1333 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1334 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1335 JVM_END 1336 1337 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1338 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1339 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1340 JVM_END 1341 1342 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1343 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1344 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1345 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1346 JVM_END 1347 1348 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1349 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1350 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1351 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1352 JVM_END 1353 1354 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1355 1356 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1357 assert (cls != nullptr, "illegal class"); 1358 JvmtiVMObjectAllocEventCollector oam; 1359 ResourceMark rm(THREAD); 1360 HandleMark hm(THREAD); 1361 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1362 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1363 return (jstring) JNIHandles::make_local(THREAD, result); 1364 JVM_END 1365 1366 1367 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1368 JvmtiVMObjectAllocEventCollector oam; 1369 oop mirror = JNIHandles::resolve_non_null(cls); 1370 1371 // Special handling for primitive objects 1372 if (java_lang_Class::is_primitive(mirror)) { 1373 // Primitive objects does not have any interfaces 1374 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1375 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1376 } 1377 1378 Klass* klass = java_lang_Class::as_Klass(mirror); 1379 // Figure size of result array 1380 int size; 1381 if (klass->is_instance_klass()) { 1382 InstanceKlass* ik = InstanceKlass::cast(klass); 1383 size = ik->local_interfaces()->length(); 1384 } else { 1385 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1386 size = 2; 1387 } 1388 1389 // Allocate result array 1390 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1391 objArrayHandle result (THREAD, r); 1392 // Fill in result 1393 if (klass->is_instance_klass()) { 1394 // Regular instance klass, fill in all local interfaces 1395 for (int index = 0; index < size; index++) { 1396 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1397 result->obj_at_put(index, k->java_mirror()); 1398 } 1399 } else { 1400 // All arrays implement java.lang.Cloneable and java.io.Serializable 1401 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1402 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1403 } 1404 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1405 JVM_END 1406 1407 1408 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1409 oop mirror = JNIHandles::resolve_non_null(cls); 1410 if (java_lang_Class::is_primitive(mirror)) { 1411 return JNI_FALSE; 1412 } 1413 Klass* k = java_lang_Class::as_Klass(mirror); 1414 return k->is_hidden(); 1415 JVM_END 1416 1417 1418 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1419 ResourceMark rm(THREAD); 1420 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1421 JvmtiVMObjectAllocEventCollector oam; 1422 1423 // Iterate through Java frames 1424 vframeStream vfst(thread); 1425 for(; !vfst.at_end(); vfst.next()) { 1426 int loc = -1; 1427 // get method of frame 1428 Method* method = vfst.method(); 1429 1430 Symbol *name = method->name(); 1431 1432 InstanceKlass* holder = method->method_holder(); 1433 if (name == vmSymbols::runWith_method_name()) { 1434 if (holder == vmClasses::Thread_klass() 1435 || holder == vmClasses::ScopedValue_Carrier_klass()) { 1436 loc = 1; 1437 } 1438 } 1439 1440 if (loc != -1) { 1441 javaVFrame *frame = vfst.asJavaVFrame(); 1442 StackValueCollection* locals = frame->locals(); 1443 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot 1444 Handle result = head_sv->get_obj(); 1445 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1446 if (result() != nullptr) { 1447 return JNIHandles::make_local(THREAD, result()); 1448 } 1449 } 1450 } 1451 1452 return nullptr; 1453 JVM_END 1454 1455 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1456 JvmtiVMObjectAllocEventCollector oam; 1457 // ofClass is a reference to a java_lang_Class object. The mirror object 1458 // of an InstanceKlass 1459 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1460 if (java_lang_Class::is_primitive(ofMirror) || 1461 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1462 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1463 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1464 } 1465 1466 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1467 InnerClassesIterator iter(k); 1468 1469 if (iter.length() == 0) { 1470 // Neither an inner nor outer class 1471 oop result = oopFactory::new_refArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1472 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1473 } 1474 1475 // find inner class info 1476 constantPoolHandle cp(thread, k->constants()); 1477 int length = iter.length(); 1478 1479 // Allocate temp. result array 1480 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length / 4, CHECK_NULL); 1481 refArrayHandle result(THREAD, r); 1482 int members = 0; 1483 1484 for (; !iter.done(); iter.next()) { 1485 int ioff = iter.inner_class_info_index(); 1486 int ooff = iter.outer_class_info_index(); 1487 1488 if (ioff != 0 && ooff != 0) { 1489 // Check to see if the name matches the class we're looking for 1490 // before attempting to find the class. 1491 if (cp->klass_name_at_matches(k, ooff)) { 1492 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1493 if (outer_klass == k) { 1494 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1495 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1496 1497 // Throws an exception if outer klass has not declared k as 1498 // an inner klass 1499 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1500 1501 result->obj_at_put(members, inner_klass->java_mirror()); 1502 members++; 1503 } 1504 } 1505 } 1506 } 1507 1508 if (members != length) { 1509 // Return array of right length 1510 refArrayOop res = oopFactory::new_refArray(vmClasses::Class_klass(), members, CHECK_NULL); 1511 for(int i = 0; i < members; i++) { 1512 res->obj_at_put(i, result->obj_at(i)); 1513 } 1514 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1515 } 1516 1517 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1518 JVM_END 1519 1520 1521 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1522 { 1523 // ofClass is a reference to a java_lang_Class object. 1524 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1525 if (java_lang_Class::is_primitive(ofMirror)) { 1526 return nullptr; 1527 } 1528 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1529 if (!klass->is_instance_klass()) { 1530 return nullptr; 1531 } 1532 1533 bool inner_is_member = false; 1534 Klass* outer_klass 1535 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1536 if (outer_klass == nullptr) return nullptr; // already a top-level class 1537 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1538 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1539 } 1540 JVM_END 1541 1542 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1543 { 1544 oop mirror = JNIHandles::resolve_non_null(cls); 1545 if (java_lang_Class::is_primitive(mirror)) { 1546 return nullptr; 1547 } 1548 Klass* klass = java_lang_Class::as_Klass(mirror); 1549 if (!klass->is_instance_klass()) { 1550 return nullptr; 1551 } 1552 InstanceKlass* k = InstanceKlass::cast(klass); 1553 int ooff = 0, noff = 0; 1554 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1555 if (noff != 0) { 1556 constantPoolHandle i_cp(thread, k->constants()); 1557 Symbol* name = i_cp->symbol_at(noff); 1558 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1559 return (jstring) JNIHandles::make_local(THREAD, str()); 1560 } 1561 } 1562 return nullptr; 1563 } 1564 JVM_END 1565 1566 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1567 assert (cls != nullptr, "illegal class"); 1568 JvmtiVMObjectAllocEventCollector oam; 1569 ResourceMark rm(THREAD); 1570 oop mirror = JNIHandles::resolve_non_null(cls); 1571 // Return null for arrays and primitives 1572 if (!java_lang_Class::is_primitive(mirror)) { 1573 Klass* k = java_lang_Class::as_Klass(mirror); 1574 if (k->is_instance_klass()) { 1575 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1576 if (sym == nullptr) return nullptr; 1577 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1578 return (jstring) JNIHandles::make_local(THREAD, str()); 1579 } 1580 } 1581 return nullptr; 1582 JVM_END 1583 1584 1585 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1586 assert (cls != nullptr, "illegal class"); 1587 oop mirror = JNIHandles::resolve_non_null(cls); 1588 // Return null for arrays and primitives 1589 if (!java_lang_Class::is_primitive(mirror)) { 1590 Klass* k = java_lang_Class::as_Klass(mirror); 1591 if (k->is_instance_klass()) { 1592 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1593 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1594 } 1595 } 1596 return nullptr; 1597 JVM_END 1598 1599 1600 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1601 // some of this code was adapted from from jni_FromReflectedField 1602 1603 oop reflected = JNIHandles::resolve_non_null(field); 1604 oop mirror = java_lang_reflect_Field::clazz(reflected); 1605 int slot = java_lang_reflect_Field::slot(reflected); 1606 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1607 1608 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 1609 int offset = ik->field_offset(slot); 1610 1611 if (modifiers & JVM_ACC_STATIC) { 1612 // for static fields we only look in the current class 1613 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1614 assert(false, "cannot find static field"); 1615 return false; 1616 } 1617 } else { 1618 // for instance fields we start with the current class and work 1619 // our way up through the superclass chain 1620 if (!ik->find_field_from_offset(offset, false, &fd)) { 1621 assert(false, "cannot find instance field"); 1622 return false; 1623 } 1624 } 1625 return true; 1626 } 1627 1628 static Method* jvm_get_method_common(jobject method) { 1629 // some of this code was adapted from from jni_FromReflectedMethod 1630 1631 oop reflected = JNIHandles::resolve_non_null(method); 1632 oop mirror = nullptr; 1633 int slot = 0; 1634 1635 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1636 mirror = java_lang_reflect_Constructor::clazz(reflected); 1637 slot = java_lang_reflect_Constructor::slot(reflected); 1638 } else { 1639 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1640 "wrong type"); 1641 mirror = java_lang_reflect_Method::clazz(reflected); 1642 slot = java_lang_reflect_Method::slot(reflected); 1643 } 1644 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 1645 1646 Method* m = ik->method_with_idnum(slot); 1647 assert(m != nullptr, "cannot find method"); 1648 return m; // caller has to deal with null in product mode 1649 } 1650 1651 /* Type use annotations support (JDK 1.8) */ 1652 1653 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1654 assert (cls != nullptr, "illegal class"); 1655 ResourceMark rm(THREAD); 1656 // Return null for arrays and primitives 1657 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1658 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1659 if (k->is_instance_klass()) { 1660 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1661 if (type_annotations != nullptr) { 1662 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1663 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1664 } 1665 } 1666 } 1667 return nullptr; 1668 JVM_END 1669 1670 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1671 assert (method != nullptr, "illegal method"); 1672 // method is a handle to a java.lang.reflect.Method object 1673 Method* m = jvm_get_method_common(method); 1674 if (m == nullptr) { 1675 return nullptr; 1676 } 1677 1678 AnnotationArray* type_annotations = m->type_annotations(); 1679 if (type_annotations != nullptr) { 1680 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1681 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1682 } 1683 1684 return nullptr; 1685 JVM_END 1686 1687 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1688 assert (field != nullptr, "illegal field"); 1689 fieldDescriptor fd; 1690 bool gotFd = jvm_get_field_common(field, fd); 1691 if (!gotFd) { 1692 return nullptr; 1693 } 1694 1695 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1696 JVM_END 1697 1698 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1699 if (!cp->is_within_bounds(index)) { 1700 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1701 } 1702 } 1703 1704 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1705 { 1706 // method is a handle to a java.lang.reflect.Method object 1707 Method* method_ptr = jvm_get_method_common(method); 1708 methodHandle mh (THREAD, method_ptr); 1709 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1710 const int num_params = mh->method_parameters_length(); 1711 1712 if (num_params < 0) { 1713 // A -1 return value from method_parameters_length means there is no 1714 // parameter data. Return null to indicate this to the reflection 1715 // API. 1716 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1717 return (jobjectArray)nullptr; 1718 } else { 1719 // Otherwise, we return something up to reflection, even if it is 1720 // a zero-length array. Why? Because in some cases this can 1721 // trigger a MalformedParametersException. 1722 1723 // make sure all the symbols are properly formatted 1724 for (int i = 0; i < num_params; i++) { 1725 MethodParametersElement* params = mh->method_parameters_start(); 1726 int index = params[i].name_cp_index; 1727 constantPoolHandle cp(THREAD, mh->constants()); 1728 bounds_check(cp, index, CHECK_NULL); 1729 1730 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1731 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1732 "Wrong type at constant pool index"); 1733 } 1734 1735 } 1736 1737 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1738 objArrayHandle result (THREAD, result_oop); 1739 1740 for (int i = 0; i < num_params; i++) { 1741 MethodParametersElement* params = mh->method_parameters_start(); 1742 // For a 0 index, give a null symbol 1743 Symbol* sym = 0 != params[i].name_cp_index ? 1744 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1745 int flags = params[i].flags; 1746 oop param = Reflection::new_parameter(reflected_method, i, sym, 1747 flags, CHECK_NULL); 1748 result->obj_at_put(i, param); 1749 } 1750 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1751 } 1752 } 1753 JVM_END 1754 1755 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1756 1757 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1758 { 1759 JvmtiVMObjectAllocEventCollector oam; 1760 1761 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1762 // Exclude primitive types and array types 1763 if (java_lang_Class::is_primitive(ofMirror) || 1764 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1765 // Return empty array 1766 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1767 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1768 } 1769 1770 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1771 constantPoolHandle cp(THREAD, k->constants()); 1772 1773 // Ensure class is linked 1774 k->link_class(CHECK_NULL); 1775 1776 // Allocate result 1777 int num_fields; 1778 1779 if (publicOnly) { 1780 num_fields = 0; 1781 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1782 if (fs.access_flags().is_public()) ++num_fields; 1783 } 1784 } else { 1785 num_fields = k->java_fields_count(); 1786 } 1787 1788 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1789 objArrayHandle result (THREAD, r); 1790 1791 int out_idx = 0; 1792 fieldDescriptor fd; 1793 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1794 if (!publicOnly || fs.access_flags().is_public()) { 1795 fd.reinitialize(k, fs.to_FieldInfo()); 1796 oop field = Reflection::new_field(&fd, CHECK_NULL); 1797 result->obj_at_put(out_idx, field); 1798 ++out_idx; 1799 } 1800 } 1801 assert(out_idx == num_fields, "just checking"); 1802 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1803 } 1804 JVM_END 1805 1806 // A class is a record if and only if it is final and a direct subclass of 1807 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1808 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1809 { 1810 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1811 if (k != nullptr && k->is_instance_klass()) { 1812 InstanceKlass* ik = InstanceKlass::cast(k); 1813 return ik->is_record(); 1814 } else { 1815 return false; 1816 } 1817 } 1818 JVM_END 1819 1820 // Returns an array containing the components of the Record attribute, 1821 // or null if the attribute is not present. 1822 // 1823 // Note that this function returns the components of the Record attribute 1824 // even if the class is not a record. 1825 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1826 { 1827 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass)); 1828 1829 Array<RecordComponent*>* components = ik->record_components(); 1830 if (components != nullptr) { 1831 JvmtiVMObjectAllocEventCollector oam; 1832 constantPoolHandle cp(THREAD, ik->constants()); 1833 int length = components->length(); 1834 assert(length >= 0, "unexpected record_components length"); 1835 objArrayOop record_components = 1836 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1837 objArrayHandle components_h (THREAD, record_components); 1838 1839 for (int x = 0; x < length; x++) { 1840 RecordComponent* component = components->at(x); 1841 assert(component != nullptr, "unexpected null record component"); 1842 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1843 components_h->obj_at_put(x, component_oop); 1844 } 1845 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1846 } 1847 1848 return nullptr; 1849 } 1850 JVM_END 1851 1852 static jobjectArray get_class_declared_methods_helper( 1853 JNIEnv *env, 1854 jclass ofClass, jboolean publicOnly, 1855 bool want_constructor, 1856 Klass* klass, TRAPS) { 1857 1858 JvmtiVMObjectAllocEventCollector oam; 1859 1860 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1861 // Exclude primitive types and array types 1862 if (java_lang_Class::is_primitive(ofMirror) 1863 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1864 // Return empty array 1865 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1866 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1867 } 1868 1869 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror); 1870 1871 // Ensure class is linked 1872 k->link_class(CHECK_NULL); 1873 1874 Array<Method*>* methods = k->methods(); 1875 int methods_length = methods->length(); 1876 1877 // Save original method_idnum in case of redefinition, which can change 1878 // the idnum of obsolete methods. The new method will have the same idnum 1879 // but if we refresh the methods array, the counts will be wrong. 1880 ResourceMark rm(THREAD); 1881 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1882 int num_methods = 0; 1883 1884 // Select methods matching the criteria. 1885 for (int i = 0; i < methods_length; i++) { 1886 Method* method = methods->at(i); 1887 if (want_constructor && !method->is_object_constructor()) { 1888 continue; 1889 } 1890 if (!want_constructor && 1891 (method->is_object_constructor() || method->is_class_initializer() || 1892 method->is_overpass())) { 1893 continue; 1894 } 1895 if (publicOnly && !method->is_public()) { 1896 continue; 1897 } 1898 idnums->push(method->method_idnum()); 1899 ++num_methods; 1900 } 1901 1902 // Allocate result 1903 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1904 objArrayHandle result (THREAD, r); 1905 1906 // Now just put the methods that we selected above, but go by their idnum 1907 // in case of redefinition. The methods can be redefined at any safepoint, 1908 // so above when allocating the oop array and below when creating reflect 1909 // objects. 1910 for (int i = 0; i < num_methods; i++) { 1911 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1912 if (method.is_null()) { 1913 // Method may have been deleted and seems this API can handle null 1914 // Otherwise should probably put a method that throws NSME 1915 result->obj_at_put(i, nullptr); 1916 } else { 1917 oop m; 1918 if (want_constructor) { 1919 assert(method->is_object_constructor(), "must be"); 1920 m = Reflection::new_constructor(method, CHECK_NULL); 1921 } else { 1922 m = Reflection::new_method(method, false, CHECK_NULL); 1923 } 1924 result->obj_at_put(i, m); 1925 } 1926 } 1927 1928 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1929 } 1930 1931 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1932 { 1933 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1934 /*want_constructor*/ false, 1935 vmClasses::reflect_Method_klass(), THREAD); 1936 } 1937 JVM_END 1938 1939 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1940 { 1941 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1942 /*want_constructor*/ true, 1943 vmClasses::reflect_Constructor_klass(), THREAD); 1944 } 1945 JVM_END 1946 1947 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1948 { 1949 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1950 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member)); 1951 return c->has_nestmate_access_to(m, THREAD); 1952 } 1953 JVM_END 1954 1955 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1956 { 1957 // current is not a primitive or array class 1958 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1959 InstanceKlass* host = c->nest_host(THREAD); 1960 return (jclass) (host == nullptr ? nullptr : 1961 JNIHandles::make_local(THREAD, host->java_mirror())); 1962 } 1963 JVM_END 1964 1965 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1966 { 1967 // current is not a primitive or array class 1968 ResourceMark rm(THREAD); 1969 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current)); 1970 InstanceKlass* host = c->nest_host(THREAD); 1971 1972 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 1973 c->external_name(), host->external_name()); 1974 { 1975 JvmtiVMObjectAllocEventCollector oam; 1976 Array<u2>* members = host->nest_members(); 1977 int length = members == nullptr ? 0 : members->length(); 1978 1979 log_trace(class, nestmates)(" - host has %d listed nest members", length); 1980 1981 // nest host is first in the array so make it one bigger 1982 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length + 1, CHECK_NULL); 1983 refArrayHandle result(THREAD, r); 1984 result->obj_at_put(0, host->java_mirror()); 1985 if (length != 0) { 1986 int count = 0; 1987 for (int i = 0; i < length; i++) { 1988 int cp_index = members->at(i); 1989 Klass* k = host->constants()->klass_at(cp_index, THREAD); 1990 if (HAS_PENDING_EXCEPTION) { 1991 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 1992 return nullptr; // propagate VMEs 1993 } 1994 if (log_is_enabled(Trace, class, nestmates)) { 1995 stringStream ss; 1996 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 1997 ss.print(" - resolution of nest member %s failed: ", target_member_class); 1998 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 1999 log_trace(class, nestmates)("%s", ss.as_string()); 2000 } 2001 CLEAR_PENDING_EXCEPTION; 2002 continue; 2003 } 2004 if (k->is_instance_klass()) { 2005 InstanceKlass* ik = InstanceKlass::cast(k); 2006 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2007 if (nest_host_k == host) { 2008 result->obj_at_put(count+1, k->java_mirror()); 2009 count++; 2010 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2011 } else { 2012 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2013 ik->external_name(), nest_host_k->external_name()); 2014 } 2015 } else { 2016 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2017 k->external_name()); 2018 } 2019 } 2020 if (count < length) { 2021 // we had invalid entries so we need to compact the array 2022 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2023 length + 1, count + 1); 2024 2025 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2026 count + 1, CHECK_NULL); 2027 objArrayHandle result2(THREAD, r2); 2028 for (int i = 0; i < count + 1; i++) { 2029 result2->obj_at_put(i, result->obj_at(i)); 2030 } 2031 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2032 } 2033 } 2034 else { 2035 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate"); 2036 } 2037 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2038 } 2039 } 2040 JVM_END 2041 2042 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2043 { 2044 oop mirror = JNIHandles::resolve_non_null(current); 2045 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2046 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 2047 2048 ResourceMark rm(THREAD); 2049 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2050 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2051 if (ik->is_sealed()) { 2052 JvmtiVMObjectAllocEventCollector oam; 2053 Array<u2>* subclasses = ik->permitted_subclasses(); 2054 int length = subclasses->length(); 2055 2056 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2057 2058 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length, CHECK_NULL); 2059 refArrayHandle result(THREAD, r); 2060 int count = 0; 2061 for (int i = 0; i < length; i++) { 2062 int cp_index = subclasses->at(i); 2063 Klass* k = ik->constants()->klass_at(cp_index, THREAD); 2064 if (HAS_PENDING_EXCEPTION) { 2065 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2066 return nullptr; // propagate VMEs 2067 } 2068 if (log_is_enabled(Trace, class, sealed)) { 2069 stringStream ss; 2070 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2071 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2072 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2073 log_trace(class, sealed)("%s", ss.as_string()); 2074 } 2075 2076 CLEAR_PENDING_EXCEPTION; 2077 continue; 2078 } 2079 if (k->is_instance_klass()) { 2080 result->obj_at_put(count++, k->java_mirror()); 2081 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2082 } 2083 } 2084 if (count < length) { 2085 // we had invalid entries so we need to compact the array 2086 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2087 count, CHECK_NULL); 2088 objArrayHandle result2(THREAD, r2); 2089 for (int i = 0; i < count; i++) { 2090 result2->obj_at_put(i, result->obj_at(i)); 2091 } 2092 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2093 } 2094 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2095 } else { 2096 return nullptr; 2097 } 2098 } 2099 JVM_END 2100 2101 // Constant pool access ////////////////////////////////////////////////////////// 2102 2103 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2104 { 2105 JvmtiVMObjectAllocEventCollector oam; 2106 oop mirror = JNIHandles::resolve_non_null(cls); 2107 // Return null for primitives and arrays 2108 if (!java_lang_Class::is_primitive(mirror)) { 2109 Klass* k = java_lang_Class::as_Klass(mirror); 2110 if (k->is_instance_klass()) { 2111 InstanceKlass* k_h = InstanceKlass::cast(k); 2112 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2113 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2114 return JNIHandles::make_local(THREAD, jcp()); 2115 } 2116 } 2117 return nullptr; 2118 } 2119 JVM_END 2120 2121 2122 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj)) 2123 { 2124 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2125 return cp->length(); 2126 } 2127 JVM_END 2128 2129 2130 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index)) 2131 { 2132 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2133 bounds_check(cp, index, CHECK_NULL); 2134 constantTag tag = cp->tag_at(index); 2135 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2136 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2137 } 2138 Klass* k = cp->klass_at(index, CHECK_NULL); 2139 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2140 } 2141 JVM_END 2142 2143 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2144 { 2145 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2146 bounds_check(cp, index, CHECK_NULL); 2147 constantTag tag = cp->tag_at(index); 2148 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2149 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2150 } 2151 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2152 if (k == nullptr) return nullptr; 2153 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2154 } 2155 JVM_END 2156 2157 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2158 constantTag tag = cp->tag_at(index); 2159 if (!tag.is_method() && !tag.is_interface_method()) { 2160 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2161 } 2162 int klass_ref = cp->uncached_klass_ref_index_at(index); 2163 Klass* k_o; 2164 if (force_resolution) { 2165 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2166 } else { 2167 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2168 if (k_o == nullptr) return nullptr; 2169 } 2170 InstanceKlass* k = InstanceKlass::cast(k_o); 2171 Symbol* name = cp->uncached_name_ref_at(index); 2172 Symbol* sig = cp->uncached_signature_ref_at(index); 2173 methodHandle m (THREAD, k->find_method(name, sig)); 2174 if (m.is_null()) { 2175 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2176 } 2177 oop method; 2178 if (m->is_object_constructor()) { 2179 method = Reflection::new_constructor(m, CHECK_NULL); 2180 } else { 2181 method = Reflection::new_method(m, true, CHECK_NULL); 2182 } 2183 return JNIHandles::make_local(THREAD, method); 2184 } 2185 2186 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index)) 2187 { 2188 JvmtiVMObjectAllocEventCollector oam; 2189 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2190 bounds_check(cp, index, CHECK_NULL); 2191 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2192 return res; 2193 } 2194 JVM_END 2195 2196 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2197 { 2198 JvmtiVMObjectAllocEventCollector oam; 2199 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2200 bounds_check(cp, index, CHECK_NULL); 2201 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2202 return res; 2203 } 2204 JVM_END 2205 2206 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2207 constantTag tag = cp->tag_at(index); 2208 if (!tag.is_field()) { 2209 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2210 } 2211 int klass_ref = cp->uncached_klass_ref_index_at(index); 2212 Klass* k_o; 2213 if (force_resolution) { 2214 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2215 } else { 2216 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2217 if (k_o == nullptr) return nullptr; 2218 } 2219 InstanceKlass* k = InstanceKlass::cast(k_o); 2220 Symbol* name = cp->uncached_name_ref_at(index); 2221 Symbol* sig = cp->uncached_signature_ref_at(index); 2222 fieldDescriptor fd; 2223 Klass* target_klass = k->find_field(name, sig, &fd); 2224 if (target_klass == nullptr) { 2225 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2226 } 2227 oop field = Reflection::new_field(&fd, CHECK_NULL); 2228 return JNIHandles::make_local(THREAD, field); 2229 } 2230 2231 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index)) 2232 { 2233 JvmtiVMObjectAllocEventCollector oam; 2234 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2235 bounds_check(cp, index, CHECK_NULL); 2236 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2237 return res; 2238 } 2239 JVM_END 2240 2241 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index)) 2242 { 2243 JvmtiVMObjectAllocEventCollector oam; 2244 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2245 bounds_check(cp, index, CHECK_NULL); 2246 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2247 return res; 2248 } 2249 JVM_END 2250 2251 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index)) 2252 { 2253 JvmtiVMObjectAllocEventCollector oam; 2254 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2255 bounds_check(cp, index, CHECK_NULL); 2256 constantTag tag = cp->tag_at(index); 2257 if (!tag.is_field_or_method()) { 2258 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2259 } 2260 int klass_ref = cp->uncached_klass_ref_index_at(index); 2261 Symbol* klass_name = cp->klass_name_at(klass_ref); 2262 Symbol* member_name = cp->uncached_name_ref_at(index); 2263 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2264 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2265 objArrayHandle dest(THREAD, dest_o); 2266 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2267 dest->obj_at_put(0, str()); 2268 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2269 dest->obj_at_put(1, str()); 2270 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2271 dest->obj_at_put(2, str()); 2272 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2273 } 2274 JVM_END 2275 2276 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index)) 2277 { 2278 JvmtiVMObjectAllocEventCollector oam; 2279 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2280 bounds_check(cp, index, CHECK_0); 2281 constantTag tag = cp->tag_at(index); 2282 if (!tag.is_field_or_method()) { 2283 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2284 } 2285 return (jint) cp->uncached_klass_ref_index_at(index); 2286 } 2287 JVM_END 2288 2289 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index)) 2290 { 2291 JvmtiVMObjectAllocEventCollector oam; 2292 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2293 bounds_check(cp, index, CHECK_0); 2294 constantTag tag = cp->tag_at(index); 2295 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2296 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2297 } 2298 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2299 } 2300 JVM_END 2301 2302 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index)) 2303 { 2304 JvmtiVMObjectAllocEventCollector oam; 2305 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2306 bounds_check(cp, index, CHECK_NULL); 2307 constantTag tag = cp->tag_at(index); 2308 if (!tag.is_name_and_type()) { 2309 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2310 } 2311 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2312 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2313 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2314 objArrayHandle dest(THREAD, dest_o); 2315 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2316 dest->obj_at_put(0, str()); 2317 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2318 dest->obj_at_put(1, str()); 2319 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2320 } 2321 JVM_END 2322 2323 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index)) 2324 { 2325 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2326 bounds_check(cp, index, CHECK_0); 2327 constantTag tag = cp->tag_at(index); 2328 if (!tag.is_int()) { 2329 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2330 } 2331 return cp->int_at(index); 2332 } 2333 JVM_END 2334 2335 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index)) 2336 { 2337 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2338 bounds_check(cp, index, CHECK_(0L)); 2339 constantTag tag = cp->tag_at(index); 2340 if (!tag.is_long()) { 2341 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2342 } 2343 return cp->long_at(index); 2344 } 2345 JVM_END 2346 2347 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index)) 2348 { 2349 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2350 bounds_check(cp, index, CHECK_(0.0f)); 2351 constantTag tag = cp->tag_at(index); 2352 if (!tag.is_float()) { 2353 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2354 } 2355 return cp->float_at(index); 2356 } 2357 JVM_END 2358 2359 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index)) 2360 { 2361 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2362 bounds_check(cp, index, CHECK_(0.0)); 2363 constantTag tag = cp->tag_at(index); 2364 if (!tag.is_double()) { 2365 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2366 } 2367 return cp->double_at(index); 2368 } 2369 JVM_END 2370 2371 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index)) 2372 { 2373 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2374 bounds_check(cp, index, CHECK_NULL); 2375 constantTag tag = cp->tag_at(index); 2376 if (!tag.is_string()) { 2377 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2378 } 2379 oop str = cp->string_at(index, CHECK_NULL); 2380 return (jstring) JNIHandles::make_local(THREAD, str); 2381 } 2382 JVM_END 2383 2384 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index)) 2385 { 2386 JvmtiVMObjectAllocEventCollector oam; 2387 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2388 bounds_check(cp, index, CHECK_NULL); 2389 constantTag tag = cp->tag_at(index); 2390 if (!tag.is_symbol()) { 2391 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2392 } 2393 Symbol* sym = cp->symbol_at(index); 2394 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2395 return (jstring) JNIHandles::make_local(THREAD, str()); 2396 } 2397 JVM_END 2398 2399 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index)) 2400 { 2401 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2402 bounds_check(cp, index, CHECK_0); 2403 constantTag tag = cp->tag_at(index); 2404 jbyte result = tag.value(); 2405 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2406 // they are changed to the corresponding tags from the JVM spec, so that java code in 2407 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2408 if (tag.is_klass_or_reference()) { 2409 result = JVM_CONSTANT_Class; 2410 } else if (tag.is_string_index()) { 2411 result = JVM_CONSTANT_String; 2412 } else if (tag.is_method_type_in_error()) { 2413 result = JVM_CONSTANT_MethodType; 2414 } else if (tag.is_method_handle_in_error()) { 2415 result = JVM_CONSTANT_MethodHandle; 2416 } else if (tag.is_dynamic_constant_in_error()) { 2417 result = JVM_CONSTANT_Dynamic; 2418 } 2419 return result; 2420 } 2421 JVM_END 2422 2423 // Assertion support. ////////////////////////////////////////////////////////// 2424 2425 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2426 assert(cls != nullptr, "bad class"); 2427 2428 oop r = JNIHandles::resolve(cls); 2429 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2430 if (java_lang_Class::is_primitive(r)) return false; 2431 2432 Klass* k = java_lang_Class::as_Klass(r); 2433 assert(k->is_instance_klass(), "must be an instance klass"); 2434 if (!k->is_instance_klass()) return false; 2435 2436 ResourceMark rm(THREAD); 2437 const char* name = k->name()->as_C_string(); 2438 bool system_class = k->class_loader() == nullptr; 2439 return JavaAssertions::enabled(name, system_class); 2440 2441 JVM_END 2442 2443 2444 // Return a new AssertionStatusDirectives object with the fields filled in with 2445 // command-line assertion arguments (i.e., -ea, -da). 2446 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2447 JvmtiVMObjectAllocEventCollector oam; 2448 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2449 return JNIHandles::make_local(THREAD, asd); 2450 JVM_END 2451 2452 // Verification //////////////////////////////////////////////////////////////////////////////// 2453 2454 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2455 2456 // RedefineClasses support: bug 6214132 caused verification to fail. 2457 // All functions from this section, unless noted otherwise, should call the functions 2458 // get_klass_considering_redefinition(), or 2459 // get_instance_klass_considering_redefinition() 2460 // These functions return JvmtiThreadState::_scratch_class if the verifier 2461 // was invoked in the middle of the redefinition of cls. 2462 // See jvmtiThreadState.hpp for details. 2463 2464 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) { 2465 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2466 if (k->is_instance_klass()) { 2467 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread); 2468 } else { 2469 return k; 2470 } 2471 } 2472 2473 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) { 2474 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls)); 2475 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread); 2476 } 2477 2478 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 2479 oop mirror = JNIHandles::resolve_non_null(cls); 2480 if (java_lang_Class::is_primitive(mirror)) { 2481 return JNI_FALSE; 2482 } 2483 Klass* k = java_lang_Class::as_Klass(mirror); 2484 // This isn't necessary since answer is the same because redefinition 2485 // has already checked this matches for the scratch class. 2486 // k = get_klass_considering_redefinition(cls, thread) 2487 jboolean result = k->is_interface(); 2488 assert(!result || k->is_instance_klass(), 2489 "all interfaces are instance types"); 2490 return result; 2491 JVM_END 2492 2493 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2494 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name. 2495 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2496 return k->name()->as_utf8(); 2497 JVM_END 2498 2499 2500 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2501 Klass* k = get_klass_considering_redefinition(cls, thread); 2502 // types will have length zero if this is not an InstanceKlass 2503 // (length is determined by call to JVM_GetClassCPEntriesCount) 2504 if (k->is_instance_klass()) { 2505 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2506 for (int index = cp->length() - 1; index >= 0; index--) { 2507 constantTag tag = cp->tag_at(index); 2508 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2509 } 2510 } 2511 JVM_END 2512 2513 2514 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2515 Klass* k = get_klass_considering_redefinition(cls, thread); 2516 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2517 JVM_END 2518 2519 2520 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2521 Klass* k = get_klass_considering_redefinition(cls, thread); 2522 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2523 JVM_END 2524 2525 2526 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2527 Klass* k = get_klass_considering_redefinition(cls, thread); 2528 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2529 JVM_END 2530 2531 2532 // The following methods, used for the verifier, are never called with 2533 // array klasses, so a direct cast to InstanceKlass is safe. 2534 // Typically, these methods are called in a loop with bounds determined 2535 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2536 // zero for arrays. 2537 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2538 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2539 Method* method = ik->methods()->at(method_index); 2540 int length = method->checked_exceptions_length(); 2541 if (length > 0) { 2542 CheckedExceptionElement* table= method->checked_exceptions_start(); 2543 for (int i = 0; i < length; i++) { 2544 exceptions[i] = table[i].class_cp_index; 2545 } 2546 } 2547 JVM_END 2548 2549 2550 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2551 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2552 Method* method = ik->methods()->at(method_index); 2553 return method->checked_exceptions_length(); 2554 JVM_END 2555 2556 2557 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2558 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2559 Method* method = ik->methods()->at(method_index); 2560 memcpy(code, method->code_base(), method->code_size()); 2561 JVM_END 2562 2563 2564 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2565 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2566 Method* method = ik->methods()->at(method_index); 2567 return method->code_size(); 2568 JVM_END 2569 2570 2571 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2572 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2573 Method* method = ik->methods()->at(method_index); 2574 ExceptionTable extable(method); 2575 entry->start_pc = extable.start_pc(entry_index); 2576 entry->end_pc = extable.end_pc(entry_index); 2577 entry->handler_pc = extable.handler_pc(entry_index); 2578 entry->catchType = extable.catch_type_index(entry_index); 2579 JVM_END 2580 2581 2582 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2583 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2584 Method* method = ik->methods()->at(method_index); 2585 return method->exception_table_length(); 2586 JVM_END 2587 2588 2589 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2590 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2591 Method* method = ik->methods()->at(method_index); 2592 return method->access_flags().as_method_flags(); 2593 JVM_END 2594 2595 2596 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2597 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2598 return ik->field_access_flags(field_index); 2599 JVM_END 2600 2601 2602 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2603 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2604 Method* method = ik->methods()->at(method_index); 2605 return method->max_locals(); 2606 JVM_END 2607 2608 2609 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2610 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2611 Method* method = ik->methods()->at(method_index); 2612 return method->size_of_parameters(); 2613 JVM_END 2614 2615 2616 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2617 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2618 Method* method = ik->methods()->at(method_index); 2619 return method->verifier_max_stack(); 2620 JVM_END 2621 2622 2623 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2624 ResourceMark rm(THREAD); 2625 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2626 Method* method = ik->methods()->at(method_index); 2627 return method->is_object_constructor(); 2628 JVM_END 2629 2630 2631 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2632 ResourceMark rm(THREAD); 2633 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2634 Method* method = ik->methods()->at(method_index); 2635 return method->is_overpass(); 2636 JVM_END 2637 2638 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2639 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2640 Method* method = ik->methods()->at(method_index); 2641 return method->name()->as_utf8(); 2642 JVM_END 2643 2644 2645 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2646 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2647 Method* method = ik->methods()->at(method_index); 2648 return method->signature()->as_utf8(); 2649 JVM_END 2650 2651 /** 2652 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2653 * read entries in the constant pool. Since the old verifier always 2654 * works on a copy of the code, it will not see any rewriting that 2655 * may possibly occur in the middle of verification. So it is important 2656 * that nothing it calls tries to use the cpCache instead of the raw 2657 * constant pool, so we must use cp->uncached_x methods when appropriate. 2658 */ 2659 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2660 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2661 ConstantPool* cp = ik->constants(); 2662 switch (cp->tag_at(cp_index).value()) { 2663 case JVM_CONSTANT_Fieldref: 2664 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2665 default: 2666 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2667 } 2668 ShouldNotReachHere(); 2669 return nullptr; 2670 JVM_END 2671 2672 2673 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2674 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2675 ConstantPool* cp = ik->constants(); 2676 switch (cp->tag_at(cp_index).value()) { 2677 case JVM_CONSTANT_InterfaceMethodref: 2678 case JVM_CONSTANT_Methodref: 2679 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2680 default: 2681 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2682 } 2683 ShouldNotReachHere(); 2684 return nullptr; 2685 JVM_END 2686 2687 2688 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2689 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2690 ConstantPool* cp = ik->constants(); 2691 switch (cp->tag_at(cp_index).value()) { 2692 case JVM_CONSTANT_InterfaceMethodref: 2693 case JVM_CONSTANT_Methodref: 2694 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2695 default: 2696 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2697 } 2698 ShouldNotReachHere(); 2699 return nullptr; 2700 JVM_END 2701 2702 2703 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2704 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2705 ConstantPool* cp = ik->constants(); 2706 switch (cp->tag_at(cp_index).value()) { 2707 case JVM_CONSTANT_Fieldref: 2708 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2709 default: 2710 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2711 } 2712 ShouldNotReachHere(); 2713 return nullptr; 2714 JVM_END 2715 2716 2717 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2718 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2719 ConstantPool* cp = ik->constants(); 2720 Symbol* classname = cp->klass_name_at(cp_index); 2721 return classname->as_utf8(); 2722 JVM_END 2723 2724 2725 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2726 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2727 ConstantPool* cp = ik->constants(); 2728 switch (cp->tag_at(cp_index).value()) { 2729 case JVM_CONSTANT_Fieldref: { 2730 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2731 Symbol* classname = cp->klass_name_at(class_index); 2732 return classname->as_utf8(); 2733 } 2734 default: 2735 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2736 } 2737 ShouldNotReachHere(); 2738 return nullptr; 2739 JVM_END 2740 2741 2742 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2743 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2744 ConstantPool* cp = ik->constants(); 2745 switch (cp->tag_at(cp_index).value()) { 2746 case JVM_CONSTANT_Methodref: 2747 case JVM_CONSTANT_InterfaceMethodref: { 2748 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2749 Symbol* classname = cp->klass_name_at(class_index); 2750 return classname->as_utf8(); 2751 } 2752 default: 2753 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2754 } 2755 ShouldNotReachHere(); 2756 return nullptr; 2757 JVM_END 2758 2759 2760 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2761 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2762 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread); 2763 ConstantPool* cp = ik->constants(); 2764 ConstantPool* cp_called = ik_called->constants(); 2765 switch (cp->tag_at(cp_index).value()) { 2766 case JVM_CONSTANT_Fieldref: { 2767 Symbol* name = cp->uncached_name_ref_at(cp_index); 2768 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2769 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) { 2770 if (fs.name() == name && fs.signature() == signature) { 2771 return fs.access_flags().as_field_flags(); 2772 } 2773 } 2774 return -1; 2775 } 2776 default: 2777 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2778 } 2779 ShouldNotReachHere(); 2780 return 0; 2781 JVM_END 2782 2783 2784 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2785 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread); 2786 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread); 2787 ConstantPool* cp = ik->constants(); 2788 switch (cp->tag_at(cp_index).value()) { 2789 case JVM_CONSTANT_Methodref: 2790 case JVM_CONSTANT_InterfaceMethodref: { 2791 Symbol* name = cp->uncached_name_ref_at(cp_index); 2792 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2793 Array<Method*>* methods = ik_called->methods(); 2794 int methods_count = methods->length(); 2795 for (int i = 0; i < methods_count; i++) { 2796 Method* method = methods->at(i); 2797 if (method->name() == name && method->signature() == signature) { 2798 return method->access_flags().as_method_flags(); 2799 } 2800 } 2801 return -1; 2802 } 2803 default: 2804 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2805 } 2806 ShouldNotReachHere(); 2807 return 0; 2808 JVM_END 2809 2810 2811 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2812 2813 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2814 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2815 JVM_END 2816 2817 2818 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2819 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2820 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2821 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2822 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2823 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2824 JVM_END 2825 2826 // Printing support ////////////////////////////////////////////////// 2827 extern "C" { 2828 2829 ATTRIBUTE_PRINTF(3, 0) 2830 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2831 // Reject count values that are negative signed values converted to 2832 // unsigned; see bug 4399518, 4417214 2833 if ((intptr_t)count <= 0) return -1; 2834 2835 int result = os::vsnprintf(str, count, fmt, args); 2836 if (result > 0 && (size_t)result >= count) { 2837 result = -1; 2838 } 2839 2840 return result; 2841 } 2842 2843 ATTRIBUTE_PRINTF(3, 4) 2844 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2845 va_list args; 2846 int len; 2847 va_start(args, fmt); 2848 len = jio_vsnprintf(str, count, fmt, args); 2849 va_end(args); 2850 return len; 2851 } 2852 2853 ATTRIBUTE_PRINTF(2, 3) 2854 int jio_fprintf(FILE* f, const char *fmt, ...) { 2855 int len; 2856 va_list args; 2857 va_start(args, fmt); 2858 len = jio_vfprintf(f, fmt, args); 2859 va_end(args); 2860 return len; 2861 } 2862 2863 ATTRIBUTE_PRINTF(2, 0) 2864 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2865 if (Arguments::vfprintf_hook() != nullptr) { 2866 return Arguments::vfprintf_hook()(f, fmt, args); 2867 } else { 2868 return vfprintf(f, fmt, args); 2869 } 2870 } 2871 2872 ATTRIBUTE_PRINTF(1, 2) 2873 JNIEXPORT int jio_printf(const char *fmt, ...) { 2874 int len; 2875 va_list args; 2876 va_start(args, fmt); 2877 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2878 va_end(args); 2879 return len; 2880 } 2881 2882 // HotSpot specific jio method 2883 void jio_print(const char* s, size_t len) { 2884 // Try to make this function as atomic as possible. 2885 if (Arguments::vfprintf_hook() != nullptr) { 2886 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2887 } else { 2888 // Make an unused local variable to avoid warning from gcc compiler. 2889 bool dummy = os::write(defaultStream::output_fd(), s, len); 2890 } 2891 } 2892 2893 } // Extern C 2894 2895 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2896 2897 // In most of the JVM thread support functions we need to access the 2898 // thread through a ThreadsListHandle to prevent it from exiting and 2899 // being reclaimed while we try to operate on it. The exceptions to this 2900 // rule are when operating on the current thread, or if the monitor of 2901 // the target java.lang.Thread is locked at the Java level - in both 2902 // cases the target cannot exit. 2903 2904 static void thread_entry(JavaThread* thread, TRAPS) { 2905 HandleMark hm(THREAD); 2906 Handle obj(THREAD, thread->threadObj()); 2907 JavaValue result(T_VOID); 2908 JavaCalls::call_virtual(&result, 2909 obj, 2910 vmClasses::Thread_klass(), 2911 vmSymbols::run_method_name(), 2912 vmSymbols::void_method_signature(), 2913 THREAD); 2914 } 2915 2916 2917 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2918 #if INCLUDE_CDS 2919 if (CDSConfig::allow_only_single_java_thread()) { 2920 // During java -Xshare:dump, if we allow multiple Java threads to 2921 // execute in parallel, symbols and classes may be loaded in 2922 // random orders which will make the resulting CDS archive 2923 // non-deterministic. 2924 // 2925 // Lucikly, during java -Xshare:dump, it's important to run only 2926 // the code in the main Java thread (which is NOT started here) that 2927 // creates the module graph, etc. It's safe to not start the other 2928 // threads which are launched by class static initializers 2929 // (ReferenceHandler, FinalizerThread and CleanerImpl). 2930 if (log_is_enabled(Info, aot)) { 2931 ResourceMark rm; 2932 oop t = JNIHandles::resolve_non_null(jthread); 2933 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 2934 } 2935 return; 2936 } 2937 #endif 2938 JavaThread *native_thread = nullptr; 2939 2940 // We cannot hold the Threads_lock when we throw an exception, 2941 // due to rank ordering issues. Example: we might need to grab the 2942 // Heap_lock while we construct the exception. 2943 bool throw_illegal_thread_state = false; 2944 2945 // We must release the Threads_lock before we can post a jvmti event 2946 // in Thread::start. 2947 { 2948 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock); 2949 // Ensure that the C++ Thread and OSThread structures aren't freed before 2950 // we operate. 2951 MutexLocker ml(Threads_lock); 2952 2953 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2954 // re-starting an already started thread, so we should usually find 2955 // that the JavaThread is null. However for a JNI attached thread 2956 // there is a small window between the Thread object being created 2957 // (with its JavaThread set) and the update to its threadStatus, so we 2958 // have to check for this 2959 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 2960 throw_illegal_thread_state = true; 2961 } else { 2962 jlong size = 2963 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2964 // Allocate the C++ Thread structure and create the native thread. The 2965 // stack size retrieved from java is 64-bit signed, but the constructor takes 2966 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2967 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2968 // - Avoid passing negative values which would result in really large stacks. 2969 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2970 size_t sz = size > 0 ? (size_t) size : 0; 2971 native_thread = new JavaThread(&thread_entry, sz); 2972 2973 // At this point it may be possible that no osthread was created for the 2974 // JavaThread due to lack of memory. Check for this situation and throw 2975 // an exception if necessary. Eventually we may want to change this so 2976 // that we only grab the lock if the thread was created successfully - 2977 // then we can also do this check and throw the exception in the 2978 // JavaThread constructor. 2979 if (native_thread->osthread() != nullptr) { 2980 // Note: the current thread is not being used within "prepare". 2981 native_thread->prepare(jthread); 2982 } 2983 } 2984 } 2985 2986 if (throw_illegal_thread_state) { 2987 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2988 } 2989 2990 assert(native_thread != nullptr, "Starting null thread?"); 2991 2992 if (native_thread->osthread() == nullptr) { 2993 ResourceMark rm(thread); 2994 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 2995 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 2996 // No one should hold a reference to the 'native_thread'. 2997 native_thread->smr_delete(); 2998 if (JvmtiExport::should_post_resource_exhausted()) { 2999 JvmtiExport::post_resource_exhausted( 3000 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3001 os::native_thread_creation_failed_msg()); 3002 } 3003 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3004 os::native_thread_creation_failed_msg()); 3005 } 3006 3007 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3008 3009 Thread::start(native_thread); 3010 3011 JVM_END 3012 3013 3014 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3015 ThreadsListHandle tlh(thread); 3016 oop java_thread = nullptr; 3017 JavaThread* receiver = nullptr; 3018 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3019 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3020 3021 if (is_alive) { 3022 // jthread refers to a live JavaThread. 3023 Thread::set_priority(receiver, (ThreadPriority)prio); 3024 } 3025 // Implied else: If the JavaThread hasn't started yet, then the 3026 // priority set in the java.lang.Thread object above will be pushed 3027 // down when it does start. 3028 JVM_END 3029 3030 3031 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3032 HOTSPOT_THREAD_YIELD(); 3033 os::naked_yield(); 3034 JVM_END 3035 3036 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos)) 3037 if (nanos < 0) { 3038 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range"); 3039 } 3040 3041 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3042 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3043 } 3044 3045 // Save current thread state and restore it at the end of this block. 3046 // And set new thread state to SLEEPING. 3047 JavaThreadSleepState jtss(thread); 3048 3049 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC); 3050 3051 if (nanos == 0) { 3052 os::naked_yield(); 3053 } else { 3054 ThreadState old_state = thread->osthread()->get_state(); 3055 thread->osthread()->set_state(SLEEPING); 3056 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed 3057 // An asynchronous exception could have been thrown on 3058 // us while we were sleeping. We do not overwrite those. 3059 if (!HAS_PENDING_EXCEPTION) { 3060 HOTSPOT_THREAD_SLEEP_END(1); 3061 if (!thread->has_async_exception_condition()) { 3062 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3063 // to properly restore the thread state. That's likely wrong. 3064 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3065 } 3066 } 3067 } 3068 thread->osthread()->set_state(old_state); 3069 } 3070 HOTSPOT_THREAD_SLEEP_END(0); 3071 JVM_END 3072 3073 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3074 oop jthread = thread->threadObj(); 3075 assert(jthread != nullptr, "no current carrier thread!"); 3076 return JNIHandles::make_local(THREAD, jthread); 3077 JVM_END 3078 3079 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3080 oop theThread = thread->vthread(); 3081 assert(theThread != (oop)nullptr, "no current thread!"); 3082 return JNIHandles::make_local(THREAD, theThread); 3083 JVM_END 3084 3085 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3086 jobject theThread)) 3087 oop threadObj = JNIHandles::resolve(theThread); 3088 thread->set_vthread(threadObj); 3089 3090 // Set _monitor_owner_id of new current Thread 3091 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj)); 3092 3093 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3094 JVM_END 3095 3096 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3097 return ThreadIdentifier::unsafe_offset(); 3098 JVM_END 3099 3100 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3101 ThreadsListHandle tlh(thread); 3102 JavaThread* receiver = nullptr; 3103 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3104 if (is_alive) { 3105 // jthread refers to a live JavaThread. 3106 receiver->interrupt(); 3107 } 3108 JVM_END 3109 3110 // Return true iff the current thread has locked the object passed in 3111 3112 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3113 if (obj == nullptr) { 3114 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3115 } 3116 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3117 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3118 JVM_END 3119 3120 JVM_ENTRY(jobjectArray, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3121 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD); 3122 return (jobjectArray) JNIHandles::make_local(THREAD, trace); 3123 JVM_END 3124 3125 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread)) 3126 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD); 3127 return JNIHandles::make_local(THREAD, snapshot); 3128 JVM_END 3129 3130 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3131 // We don't use a ThreadsListHandle here because the current thread 3132 // must be alive. 3133 oop java_thread = JNIHandles::resolve_non_null(jthread); 3134 JavaThread* thr = java_lang_Thread::thread(java_thread); 3135 if (thread == thr && !thr->has_attached_via_jni()) { 3136 // Thread naming is only supported for the current thread and 3137 // we don't set the name of an attached thread to avoid stepping 3138 // on other programs. 3139 ResourceMark rm(thread); 3140 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3141 os::set_native_thread_name(thread_name); 3142 } 3143 JVM_END 3144 3145 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3146 oop theCache = thread->scopedValueCache(); 3147 return JNIHandles::make_local(THREAD, theCache); 3148 JVM_END 3149 3150 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3151 jobject theCache)) 3152 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3153 thread->set_scopedValueCache(objs); 3154 JVM_END 3155 3156 3157 // java.lang.Package //////////////////////////////////////////////////////////////// 3158 3159 3160 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3161 ResourceMark rm(THREAD); 3162 JvmtiVMObjectAllocEventCollector oam; 3163 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3164 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3165 return (jstring) JNIHandles::make_local(THREAD, result); 3166 JVM_END 3167 3168 3169 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3170 JvmtiVMObjectAllocEventCollector oam; 3171 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3172 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3173 JVM_END 3174 3175 3176 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3177 3178 3179 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3180 MonitorLocker ml(Heap_lock); 3181 oop ref = Universe::reference_pending_list(); 3182 if (ref != nullptr) { 3183 Universe::clear_reference_pending_list(); 3184 } 3185 return JNIHandles::make_local(THREAD, ref); 3186 JVM_END 3187 3188 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3189 MonitorLocker ml(Heap_lock); 3190 return Universe::has_reference_pending_list(); 3191 JVM_END 3192 3193 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3194 MonitorLocker ml(Heap_lock); 3195 while (!Universe::has_reference_pending_list()) { 3196 ml.wait(); 3197 } 3198 JVM_END 3199 3200 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref)) 3201 oop ref_oop = JNIHandles::resolve_non_null(ref); 3202 // PhantomReference has its own implementation of get(). 3203 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3204 oop referent = java_lang_ref_Reference::weak_referent(ref_oop); 3205 return JNIHandles::make_local(THREAD, referent); 3206 JVM_END 3207 3208 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3209 oop ref_oop = JNIHandles::resolve_non_null(ref); 3210 // PhantomReference has its own implementation of refersTo(). 3211 // See: JVM_PhantomReferenceRefersTo 3212 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3213 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3214 return referent == JNIHandles::resolve(o); 3215 JVM_END 3216 3217 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3218 oop ref_oop = JNIHandles::resolve_non_null(ref); 3219 // FinalReference has it's own implementation of clear(). 3220 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3221 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3222 // If the referent has already been cleared then done. 3223 // However, if the referent is dead but has not yet been cleared by 3224 // concurrent reference processing, it should NOT be cleared here. 3225 // Instead, clearing should be left to the GC. Clearing it here could 3226 // detectably lose an expected notification, which is impossible with 3227 // STW reference processing. The clearing in enqueue() doesn't have 3228 // this problem, since the enqueue covers the notification, but it's not 3229 // worth the effort to handle that case specially. 3230 return; 3231 } 3232 java_lang_ref_Reference::clear_referent(ref_oop); 3233 JVM_END 3234 3235 3236 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3237 3238 3239 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3240 oop ref_oop = JNIHandles::resolve_non_null(ref); 3241 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3242 return referent == JNIHandles::resolve(o); 3243 JVM_END 3244 3245 3246 // ObjectInputStream /////////////////////////////////////////////////////////////// 3247 3248 // Return the first user-defined class loader up the execution stack, or null 3249 // if only code from the bootstrap or platform class loader is on the stack. 3250 3251 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3252 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3253 InstanceKlass* ik = vfst.method()->method_holder(); 3254 oop loader = ik->class_loader(); 3255 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3256 return JNIHandles::make_local(THREAD, loader); 3257 } 3258 } 3259 return nullptr; 3260 JVM_END 3261 3262 3263 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3264 3265 3266 // resolve array handle and check arguments 3267 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3268 if (arr == nullptr) { 3269 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3270 } 3271 oop a = JNIHandles::resolve_non_null(arr); 3272 if (!a->is_array()) { 3273 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3274 } else if (type_array_only && !a->is_typeArray()) { 3275 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3276 } 3277 return arrayOop(a); 3278 } 3279 3280 3281 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3282 arrayOop a = check_array(env, arr, false, CHECK_0); 3283 return a->length(); 3284 JVM_END 3285 3286 3287 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3288 JvmtiVMObjectAllocEventCollector oam; 3289 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3290 jvalue value; 3291 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3292 oop box = Reflection::box(&value, type, CHECK_NULL); 3293 return JNIHandles::make_local(THREAD, box); 3294 JVM_END 3295 3296 3297 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3298 jvalue value; 3299 value.i = 0; // to initialize value before getting used in CHECK 3300 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3301 assert(a->is_typeArray(), "just checking"); 3302 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3303 BasicType wide_type = (BasicType) wCode; 3304 if (type != wide_type) { 3305 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3306 } 3307 return value; 3308 JVM_END 3309 3310 3311 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3312 arrayOop a = check_array(env, arr, false, CHECK); 3313 oop box = JNIHandles::resolve(val); 3314 jvalue value; 3315 value.i = 0; // to initialize value before getting used in CHECK 3316 BasicType value_type; 3317 if (a->is_objArray()) { 3318 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3319 value_type = Reflection::unbox_for_regular_object(box, &value); 3320 } else { 3321 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3322 } 3323 Reflection::array_set(&value, a, index, value_type, CHECK); 3324 JVM_END 3325 3326 3327 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3328 arrayOop a = check_array(env, arr, true, CHECK); 3329 assert(a->is_typeArray(), "just checking"); 3330 BasicType value_type = (BasicType) vCode; 3331 Reflection::array_set(&v, a, index, value_type, CHECK); 3332 JVM_END 3333 3334 3335 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3336 JvmtiVMObjectAllocEventCollector oam; 3337 oop element_mirror = JNIHandles::resolve(eltClass); 3338 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3339 return JNIHandles::make_local(THREAD, result); 3340 JVM_END 3341 3342 3343 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3344 JvmtiVMObjectAllocEventCollector oam; 3345 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3346 oop element_mirror = JNIHandles::resolve(eltClass); 3347 assert(dim_array->is_typeArray(), "just checking"); 3348 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3349 return JNIHandles::make_local(THREAD, result); 3350 JVM_END 3351 3352 3353 // Library support /////////////////////////////////////////////////////////////////////////// 3354 3355 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3356 return ZipLibrary::handle(); 3357 JVM_END 3358 3359 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3360 //%note jvm_ct 3361 char ebuf[1024]; 3362 void *load_result; 3363 { 3364 ThreadToNativeFromVM ttnfvm(thread); 3365 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3366 } 3367 if (load_result == nullptr) { 3368 if (throwException) { 3369 char msg[1024]; 3370 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3371 // Since 'ebuf' may contain a string encoded using 3372 // platform encoding scheme, we need to pass 3373 // Exceptions::unsafe_to_utf8 to the new_exception method 3374 // as the last argument. See bug 6367357. 3375 Handle h_exception = 3376 Exceptions::new_exception(thread, 3377 vmSymbols::java_lang_UnsatisfiedLinkError(), 3378 msg, Exceptions::unsafe_to_utf8); 3379 3380 THROW_HANDLE_NULL(h_exception); 3381 } else { 3382 log_info(library)("Failed to load library %s", name); 3383 return load_result; 3384 } 3385 } 3386 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3387 return load_result; 3388 JVM_END 3389 3390 3391 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3392 os::dll_unload(handle); 3393 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3394 JVM_END 3395 3396 3397 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3398 void* find_result = os::dll_lookup(handle, name); 3399 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3400 find_result != nullptr ? "Found" : "Failed to find", 3401 name, p2i(handle)); 3402 return find_result; 3403 JVM_END 3404 3405 3406 // JNI version /////////////////////////////////////////////////////////////////////////////// 3407 3408 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3409 return Threads::is_supported_jni_version_including_1_1(version); 3410 JVM_END 3411 3412 3413 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3414 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3415 JVM_END 3416 3417 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3418 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3419 JVM_END 3420 3421 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void)) 3422 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE; 3423 JVM_END 3424 3425 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void)) 3426 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE; 3427 JVM_END 3428 3429 // String support /////////////////////////////////////////////////////////////////////////// 3430 3431 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3432 JvmtiVMObjectAllocEventCollector oam; 3433 if (str == nullptr) return nullptr; 3434 oop string = JNIHandles::resolve_non_null(str); 3435 oop result = StringTable::intern(string, CHECK_NULL); 3436 return (jstring) JNIHandles::make_local(THREAD, result); 3437 JVM_END 3438 3439 3440 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3441 3442 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3443 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3444 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3445 // in the safepoint protocol, thread suspension, thread interruption, or most things of that 3446 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has 3447 // shutdown. JavaThreads will be "in native" when using this API from JDK code. 3448 3449 3450 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3451 VM_Exit::block_if_vm_exited(); 3452 return new PlatformMutex(); 3453 } 3454 3455 3456 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3457 VM_Exit::block_if_vm_exited(); 3458 delete ((PlatformMutex*) mon); 3459 } 3460 3461 3462 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3463 VM_Exit::block_if_vm_exited(); 3464 ((PlatformMutex*) mon)->lock(); 3465 return 0; 3466 } 3467 3468 3469 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3470 VM_Exit::block_if_vm_exited(); 3471 ((PlatformMutex*) mon)->unlock(); 3472 } 3473 3474 3475 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3476 3477 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3478 Handle loader, jboolean throwError, TRAPS) { 3479 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL); 3480 3481 // Check if we should initialize the class 3482 if (init && klass->is_instance_klass()) { 3483 klass->initialize(CHECK_NULL); 3484 } 3485 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3486 } 3487 3488 3489 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3490 3491 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3492 Handle method_handle; 3493 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3494 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3495 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3496 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3497 assert(args() == nullptr || !args->is_flatArray(), "args are never flat"); 3498 3499 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3500 jobject res = JNIHandles::make_local(THREAD, result); 3501 if (JvmtiExport::should_post_vm_object_alloc()) { 3502 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3503 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3504 if (java_lang_Class::is_primitive(ret_type)) { 3505 // Only for primitive type vm allocates memory for java object. 3506 // See box() method. 3507 JvmtiExport::post_vm_object_alloc(thread, result); 3508 } 3509 } 3510 return res; 3511 } else { 3512 THROW_NULL(vmSymbols::java_lang_StackOverflowError()); 3513 } 3514 JVM_END 3515 3516 3517 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3518 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0)); 3519 assert(args() == nullptr || !args->is_flatArray(), "args are never flat"); 3520 oop constructor_mirror = JNIHandles::resolve(c); 3521 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3522 jobject res = JNIHandles::make_local(THREAD, result); 3523 if (JvmtiExport::should_post_vm_object_alloc()) { 3524 JvmtiExport::post_vm_object_alloc(thread, result); 3525 } 3526 return res; 3527 JVM_END 3528 3529 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3530 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3531 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3532 JVM_END 3533 3534 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3535 jclass caller, 3536 jstring interfaceMethodName, 3537 jobject factoryType, 3538 jobject interfaceMethodType, 3539 jobject implementationMember, 3540 jobject dynamicMethodType, 3541 jclass lambdaProxyClass)) 3542 #if INCLUDE_CDS 3543 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) { 3544 return; 3545 } 3546 3547 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller)); 3548 if (caller_ik->is_hidden()) { 3549 // Hidden classes not of type lambda proxy classes are currently not being archived. 3550 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3551 // registered for archiving. 3552 return; 3553 } 3554 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass)); 3555 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3556 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3557 3558 Symbol* interface_method_name = nullptr; 3559 if (interfaceMethodName != nullptr) { 3560 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3561 } 3562 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3563 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3564 3565 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3566 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3567 3568 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3569 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3570 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3571 3572 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3573 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3574 3575 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3576 interface_method_type, m, dynamic_method_type, THREAD); 3577 #endif // INCLUDE_CDS 3578 JVM_END 3579 3580 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3581 jclass caller, 3582 jstring interfaceMethodName, 3583 jobject factoryType, 3584 jobject interfaceMethodType, 3585 jobject implementationMember, 3586 jobject dynamicMethodType)) 3587 #if INCLUDE_CDS 3588 3589 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3590 implementationMember == nullptr || dynamicMethodType == nullptr) { 3591 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3592 } 3593 3594 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller)); 3595 if (!caller_ik->in_aot_cache()) { 3596 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3597 return nullptr; 3598 } 3599 3600 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3601 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3602 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3603 3604 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3605 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3606 3607 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3608 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3609 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3610 3611 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3612 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3613 3614 InstanceKlass* loaded_lambda = 3615 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3616 interface_method_type, m, dynamic_method_type, 3617 CHECK_(nullptr)); 3618 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3619 #else 3620 return nullptr; 3621 #endif // INCLUDE_CDS 3622 JVM_END 3623 3624 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3625 if (CDSConfig::is_dumping_static_archive()) { 3626 // We do this so that the default CDS archive can be deterministic. 3627 const char* release = VM_Version::vm_release(); 3628 const char* dbg_level = VM_Version::jdk_debug_level(); 3629 const char* version = VM_Version::internal_vm_info_string(); 3630 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3631 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3632 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3633 seed += (jlong)VM_Version::vm_major_version(); 3634 seed += (jlong)VM_Version::vm_minor_version(); 3635 seed += (jlong)VM_Version::vm_security_version(); 3636 seed += (jlong)VM_Version::vm_patch_version(); 3637 if (seed == 0) { // don't let this ever be zero. 3638 seed = 0x87654321; 3639 } 3640 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3641 return seed; 3642 } else { 3643 return 0; 3644 } 3645 JVM_END 3646 3647 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus()) 3648 return CDSConfig::get_status(); 3649 JVM_END 3650 3651 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3652 #if INCLUDE_CDS 3653 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity"); 3654 if (line != nullptr) { 3655 ResourceMark rm(THREAD); 3656 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3657 char* c_line = java_lang_String::as_utf8_string(h_line()); 3658 if (CDSConfig::is_dumping_dynamic_archive()) { 3659 // Note: LambdaFormInvokers::append take same format which is not 3660 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3661 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3662 } 3663 if (ClassListWriter::is_enabled()) { 3664 ClassListWriter w; 3665 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line); 3666 } 3667 } 3668 #endif // INCLUDE_CDS 3669 JVM_END 3670 3671 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3672 #if INCLUDE_CDS 3673 ResourceMark rm(THREAD); 3674 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3675 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3676 AOTMetaspace::dump_loaded_classes(file_name, THREAD); 3677 #endif // INCLUDE_CDS 3678 JVM_END 3679 3680 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3681 #if INCLUDE_CDS 3682 ResourceMark rm(THREAD); 3683 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3684 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3685 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3686 #endif // INCLUDE_CDS 3687 JVM_END 3688 3689 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls)) 3690 #if INCLUDE_CDS 3691 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3692 if (!k->is_instance_klass()) { 3693 return false; 3694 } else { 3695 if (InstanceKlass::cast(k)->is_enum_subclass() || 3696 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) { 3697 // This class will be cached in AOT-initialized state. No need for init barriers. 3698 return false; 3699 } else { 3700 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles 3701 // must emit barriers to ensure class initialization during production run. 3702 ResourceMark rm(THREAD); 3703 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name()); 3704 return true; 3705 } 3706 } 3707 #else 3708 return false; 3709 #endif // INCLUDE_CDS 3710 JVM_END 3711 3712 // Returns an array of all live Thread objects (VM internal JavaThreads, 3713 // jvmti agent threads, and JNI attaching threads are skipped) 3714 // See CR 6404306 regarding JNI attaching threads 3715 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3716 ResourceMark rm(THREAD); 3717 ThreadsListEnumerator tle(THREAD, false, false); 3718 JvmtiVMObjectAllocEventCollector oam; 3719 3720 int num_threads = tle.num_threads(); 3721 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3722 objArrayHandle threads_ah(THREAD, r); 3723 3724 for (int i = 0; i < num_threads; i++) { 3725 Handle h = tle.get_threadObj(i); 3726 threads_ah->obj_at_put(i, h()); 3727 } 3728 3729 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3730 JVM_END 3731 3732 3733 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3734 // Return StackTraceElement[][], each element is the stack trace of a thread in 3735 // the corresponding entry in the given threads array 3736 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3737 JvmtiVMObjectAllocEventCollector oam; 3738 3739 // Check if threads is null 3740 if (threads == nullptr) { 3741 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 3742 } 3743 3744 refArrayOop a = oop_cast<refArrayOop>(JNIHandles::resolve_non_null(threads)); 3745 refArrayHandle ah(THREAD, a); 3746 int num_threads = ah->length(); 3747 // check if threads is non-empty array 3748 if (num_threads == 0) { 3749 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3750 } 3751 3752 // check if threads is not an array of objects of Thread class 3753 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3754 if (k != vmClasses::Thread_klass()) { 3755 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 3756 } 3757 3758 ResourceMark rm(THREAD); 3759 3760 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3761 for (int i = 0; i < num_threads; i++) { 3762 oop thread_obj = ah->obj_at(i); 3763 instanceHandle h(THREAD, (instanceOop) thread_obj); 3764 thread_handle_array->append(h); 3765 } 3766 3767 // The JavaThread references in thread_handle_array are validated 3768 // in VM_ThreadDump::doit(). 3769 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3770 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3771 3772 JVM_END 3773 3774 // JVM monitoring and management support 3775 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3776 return Management::get_jmm_interface(version); 3777 JVM_END 3778 3779 // com.sun.tools.attach.VirtualMachine agent properties support 3780 // 3781 // Initialize the agent properties with the properties maintained in the VM 3782 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3783 ResourceMark rm; 3784 3785 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3786 3787 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3788 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3789 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3790 return properties; 3791 JVM_END 3792 3793 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3794 { 3795 JvmtiVMObjectAllocEventCollector oam; 3796 3797 if (ofClass == nullptr) { 3798 return nullptr; 3799 } 3800 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3801 // Special handling for primitive objects 3802 if (java_lang_Class::is_primitive(mirror())) { 3803 return nullptr; 3804 } 3805 Klass* k = java_lang_Class::as_Klass(mirror()); 3806 if (!k->is_instance_klass()) { 3807 return nullptr; 3808 } 3809 InstanceKlass* ik = InstanceKlass::cast(k); 3810 int encl_method_class_idx = ik->enclosing_method_class_index(); 3811 if (encl_method_class_idx == 0) { 3812 return nullptr; 3813 } 3814 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3815 objArrayHandle dest(THREAD, dest_o); 3816 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3817 dest->obj_at_put(0, enc_k->java_mirror()); 3818 int encl_method_method_idx = ik->enclosing_method_method_index(); 3819 if (encl_method_method_idx != 0) { 3820 Symbol* sym = ik->constants()->symbol_at( 3821 extract_low_short_from_int( 3822 ik->constants()->name_and_type_at(encl_method_method_idx))); 3823 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3824 dest->obj_at_put(1, str()); 3825 sym = ik->constants()->symbol_at( 3826 extract_high_short_from_int( 3827 ik->constants()->name_and_type_at(encl_method_method_idx))); 3828 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3829 dest->obj_at_put(2, str()); 3830 } 3831 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3832 } 3833 JVM_END 3834 3835 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3836 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3837 ResourceMark rm(THREAD); 3838 3839 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3840 return nullptr; 3841 } 3842 3843 char** vm_flags = Arguments::jvm_flags_array(); 3844 char** vm_args = Arguments::jvm_args_array(); 3845 int num_flags = Arguments::num_jvm_flags(); 3846 int num_args = Arguments::num_jvm_args(); 3847 3848 InstanceKlass* ik = vmClasses::String_klass(); 3849 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3850 objArrayHandle result_h(THREAD, r); 3851 3852 int index = 0; 3853 for (int j = 0; j < num_flags; j++, index++) { 3854 stringStream prefixed; 3855 prefixed.print("-XX:%s", vm_flags[j]); 3856 Handle h = java_lang_String::create_from_platform_dependent_str(prefixed.base(), CHECK_NULL); 3857 result_h->obj_at_put(index, h()); 3858 } 3859 for (int i = 0; i < num_args; i++, index++) { 3860 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3861 result_h->obj_at_put(index, h()); 3862 } 3863 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 3864 JVM_END 3865 3866 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 3867 return os::get_signal_number(name); 3868 JVM_END 3869 3870 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread)) 3871 oop vt = JNIHandles::resolve_external_guard(vthread); 3872 MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/); 3873 JVM_END 3874 3875 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread)) 3876 oop vt = JNIHandles::resolve_external_guard(vthread); 3877 MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/); 3878 JVM_END 3879 3880 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount)) 3881 oop vt = JNIHandles::resolve_external_guard(vthread); 3882 MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/); 3883 JVM_END 3884 3885 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount)) 3886 oop vt = JNIHandles::resolve_external_guard(vthread); 3887 MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/); 3888 JVM_END 3889 3890 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section. 3891 // Needed to avoid deadlocks with JVMTI suspend mechanism. 3892 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter)) 3893 #if INCLUDE_JVMTI 3894 if (!DoJVMTIVirtualThreadTransitions) { 3895 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3896 return; 3897 } 3898 assert(thread->is_disable_suspend() != (bool)enter, 3899 "nested or unbalanced monitor enter/exit is not allowed"); 3900 thread->toggle_is_disable_suspend(); 3901 #endif 3902 JVM_END 3903 3904 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op)) 3905 #if INCLUDE_JFR 3906 freeze_result result = THREAD->last_freeze_fail_result(); 3907 assert(result != freeze_ok, "sanity check"); 3908 EventVirtualThreadPinned event(UNTIMED); 3909 event.set_starttime(THREAD->last_freeze_fail_time()); 3910 if (event.should_commit()) { 3911 ResourceMark rm(THREAD); 3912 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op)); 3913 THREAD->post_vthread_pinned_event(&event, str, result); 3914 } 3915 #endif 3916 JVM_END 3917 3918 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored)) 3919 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent(); 3920 assert(parkEvent != nullptr, "not initialized"); 3921 3922 OopHandle& list_head = ObjectMonitor::vthread_list_head(); 3923 oop vthread_head = nullptr; 3924 while (true) { 3925 if (list_head.peek() != nullptr) { 3926 for (;;) { 3927 oop head = list_head.resolve(); 3928 if (list_head.cmpxchg(head, nullptr) == head) { 3929 return JNIHandles::make_local(THREAD, head); 3930 } 3931 } 3932 } 3933 ThreadBlockInVM tbivm(THREAD); 3934 parkEvent->park(); 3935 } 3936 JVM_END 3937 3938 /* 3939 * Return the current class's class file version. The low order 16 bits of the 3940 * returned jint contain the class's major version. The high order 16 bits 3941 * contain the class's minor version. 3942 */ 3943 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 3944 oop mirror = JNIHandles::resolve_non_null(current); 3945 if (java_lang_Class::is_primitive(mirror)) { 3946 // return latest major version and minor version of 0. 3947 return JVM_CLASSFILE_MAJOR_VERSION; 3948 } 3949 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror); 3950 return (ik->minor_version() << 16) | ik->major_version(); 3951 JVM_END 3952 3953 /* 3954 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 3955 * get the value will see a materialized value and not a scalar-replaced 3956 * null value. 3957 */ 3958 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 3959 JVM_EnsureMaterializedForStackWalk(env, value); 3960 JVM_END 3961 3962 /* 3963 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded. 3964 */ 3965 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void)) 3966 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE; 3967 JVM_END --- EOF ---