1 /* 2 * Copyright (c) 1997, 2023, 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 "precompiled.hpp" 26 #include "cds/classListParser.hpp" 27 #include "cds/classListWriter.hpp" 28 #include "cds/dynamicArchive.hpp" 29 #include "cds/heapShared.hpp" 30 #include "cds/lambdaFormInvokers.hpp" 31 #include "classfile/classFileStream.hpp" 32 #include "classfile/classLoader.inline.hpp" 33 #include "classfile/classLoaderData.hpp" 34 #include "classfile/classLoaderData.inline.hpp" 35 #include "classfile/classLoadInfo.hpp" 36 #include "classfile/javaAssertions.hpp" 37 #include "classfile/javaClasses.inline.hpp" 38 #include "classfile/moduleEntry.hpp" 39 #include "classfile/modules.hpp" 40 #include "classfile/packageEntry.hpp" 41 #include "classfile/stringTable.hpp" 42 #include "classfile/symbolTable.hpp" 43 #include "classfile/systemDictionary.hpp" 44 #include "classfile/vmClasses.hpp" 45 #include "classfile/vmSymbols.hpp" 46 #include "gc/shared/collectedHeap.inline.hpp" 47 #include "interpreter/bytecode.hpp" 48 #include "interpreter/bytecodeUtils.hpp" 49 #include "jfr/jfrEvents.hpp" 50 #include "jvm.h" 51 #include "logging/log.hpp" 52 #include "memory/oopFactory.hpp" 53 #include "memory/referenceType.hpp" 54 #include "memory/resourceArea.hpp" 55 #include "memory/universe.hpp" 56 #include "oops/access.inline.hpp" 57 #include "oops/constantPool.hpp" 58 #include "oops/fieldStreams.inline.hpp" 59 #include "oops/instanceKlass.hpp" 60 #include "oops/klass.inline.hpp" 61 #include "oops/method.hpp" 62 #include "oops/recordComponent.hpp" 63 #include "oops/objArrayKlass.hpp" 64 #include "oops/objArrayOop.inline.hpp" 65 #include "oops/oop.inline.hpp" 66 #include "prims/jvm_misc.hpp" 67 #include "prims/jvmtiExport.hpp" 68 #include "prims/jvmtiThreadState.inline.hpp" 69 #include "prims/stackwalk.hpp" 70 #include "runtime/arguments.hpp" 71 #include "runtime/atomic.hpp" 72 #include "runtime/continuation.hpp" 73 #include "runtime/globals_extension.hpp" 74 #include "runtime/handles.inline.hpp" 75 #include "runtime/init.hpp" 76 #include "runtime/interfaceSupport.inline.hpp" 77 #include "runtime/deoptimization.hpp" 78 #include "runtime/handshake.hpp" 79 #include "runtime/java.hpp" 80 #include "runtime/javaCalls.hpp" 81 #include "runtime/javaThread.hpp" 82 #include "runtime/jfieldIDWorkaround.hpp" 83 #include "runtime/jniHandles.inline.hpp" 84 #include "runtime/os.inline.hpp" 85 #include "runtime/osThread.hpp" 86 #include "runtime/perfData.hpp" 87 #include "runtime/reflection.hpp" 88 #include "runtime/synchronizer.hpp" 89 #include "runtime/threadIdentifier.hpp" 90 #include "runtime/threadSMR.hpp" 91 #include "runtime/vframe.inline.hpp" 92 #include "runtime/vmOperations.hpp" 93 #include "runtime/vm_version.hpp" 94 #include "services/attachListener.hpp" 95 #include "services/management.hpp" 96 #include "services/threadService.hpp" 97 #include "utilities/copy.hpp" 98 #include "utilities/defaultStream.hpp" 99 #include "utilities/dtrace.hpp" 100 #include "utilities/events.hpp" 101 #include "utilities/macros.hpp" 102 #include "utilities/utf8.hpp" 103 #if INCLUDE_CDS 104 #include "classfile/systemDictionaryShared.hpp" 105 #endif 106 #if INCLUDE_JFR 107 #include "jfr/jfr.hpp" 108 #endif 109 #if INCLUDE_MANAGEMENT 110 #include "services/finalizerService.hpp" 111 #endif 112 113 #include <errno.h> 114 115 /* 116 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 117 such ctors and calls MUST NOT come between an oop declaration/init and its 118 usage because if objects are move this may cause various memory stomps, bus 119 errors and segfaults. Here is a cookbook for causing so called "naked oop 120 failures": 121 122 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 123 // Object address to be held directly in mirror & not visible to GC 124 oop mirror = JNIHandles::resolve_non_null(ofClass); 125 126 // If this ctor can hit a safepoint, moving objects around, then 127 ComplexConstructor foo; 128 129 // Boom! mirror may point to JUNK instead of the intended object 130 (some dereference of mirror) 131 132 // Here's another call that may block for GC, making mirror stale 133 MutexLocker ml(some_lock); 134 135 // And here's an initializer that can result in a stale oop 136 // all in one step. 137 oop o = call_that_can_throw_exception(TRAPS); 138 139 140 The solution is to keep the oop declaration BELOW the ctor or function 141 call that might cause a GC, do another resolve to reassign the oop, or 142 consider use of a Handle instead of an oop so there is immunity from object 143 motion. But note that the "QUICK" entries below do not have a handlemark 144 and thus can only support use of handles passed in. 145 */ 146 147 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 148 ResourceMark rm; 149 int line_number = -1; 150 const char * source_file = nullptr; 151 const char * trace = "explicit"; 152 InstanceKlass* caller = nullptr; 153 JavaThread* jthread = THREAD; 154 if (jthread->has_last_Java_frame()) { 155 vframeStream vfst(jthread); 156 157 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 158 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController"); 159 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 160 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction"); 161 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 162 163 Method* last_caller = nullptr; 164 165 while (!vfst.at_end()) { 166 Method* m = vfst.method(); 167 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&& 168 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 169 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 170 break; 171 } 172 last_caller = m; 173 vfst.next(); 174 } 175 // if this is called from Class.forName0 and that is called from Class.forName, 176 // then print the caller of Class.forName. If this is Class.loadClass, then print 177 // that caller, otherwise keep quiet since this should be picked up elsewhere. 178 bool found_it = false; 179 if (!vfst.at_end() && 180 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 181 vfst.method()->name() == vmSymbols::forName0_name()) { 182 vfst.next(); 183 if (!vfst.at_end() && 184 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 185 vfst.method()->name() == vmSymbols::forName_name()) { 186 vfst.next(); 187 found_it = true; 188 } 189 } else if (last_caller != nullptr && 190 last_caller->method_holder()->name() == 191 vmSymbols::java_lang_ClassLoader() && 192 last_caller->name() == vmSymbols::loadClass_name()) { 193 found_it = true; 194 } else if (!vfst.at_end()) { 195 if (vfst.method()->is_native()) { 196 // JNI call 197 found_it = true; 198 } 199 } 200 if (found_it && !vfst.at_end()) { 201 // found the caller 202 caller = vfst.method()->method_holder(); 203 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 204 if (line_number == -1) { 205 // show method name if it's a native method 206 trace = vfst.method()->name_and_sig_as_C_string(); 207 } 208 Symbol* s = caller->source_file_name(); 209 if (s != nullptr) { 210 source_file = s->as_C_string(); 211 } 212 } 213 } 214 if (caller != nullptr) { 215 if (to_class != caller) { 216 const char * from = caller->external_name(); 217 const char * to = to_class->external_name(); 218 // print in a single call to reduce interleaving between threads 219 if (source_file != nullptr) { 220 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 221 } else { 222 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 223 } 224 } 225 } 226 } 227 228 void trace_class_resolution(Klass* to_class) { 229 EXCEPTION_MARK; 230 trace_class_resolution_impl(to_class, THREAD); 231 if (HAS_PENDING_EXCEPTION) { 232 CLEAR_PENDING_EXCEPTION; 233 } 234 } 235 236 // java.lang.System ////////////////////////////////////////////////////////////////////// 237 238 239 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 240 return os::javaTimeMillis(); 241 JVM_END 242 243 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 244 return os::javaTimeNanos(); 245 JVM_END 246 247 // The function below is actually exposed by jdk.internal.misc.VM and not 248 // java.lang.System, but we choose to keep it here so that it stays next 249 // to JVM_CurrentTimeMillis and JVM_NanoTime 250 251 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 252 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 253 254 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 255 jlong seconds; 256 jlong nanos; 257 258 os::javaTimeSystemUTC(seconds, nanos); 259 260 // We're going to verify that the result can fit in a long. 261 // For that we need the difference in seconds between 'seconds' 262 // and 'offset_secs' to be such that: 263 // |seconds - offset_secs| < (2^63/10^9) 264 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 265 // which makes |seconds - offset_secs| < 2^33 266 // and we will prefer +/- 2^32 as the maximum acceptable diff 267 // as 2^32 has a more natural feel than 2^33... 268 // 269 // So if |seconds - offset_secs| >= 2^32 - we return a special 270 // sentinel value (-1) which the caller should take as an 271 // exception value indicating that the offset given to us is 272 // too far from range of the current time - leading to too big 273 // a nano adjustment. The caller is expected to recover by 274 // computing a more accurate offset and calling this method 275 // again. (For the record 2^32 secs is ~136 years, so that 276 // should rarely happen) 277 // 278 jlong diff = seconds - offset_secs; 279 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 280 return -1; // sentinel value: the offset is too far off the target 281 } 282 283 // return the adjustment. If you compute a time by adding 284 // this number of nanoseconds along with the number of seconds 285 // in the offset you should get the current UTC time. 286 return (diff * (jlong)1000000000) + nanos; 287 JVM_END 288 289 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 290 jobject dst, jint dst_pos, jint length)) 291 // Check if we have null pointers 292 if (src == nullptr || dst == nullptr) { 293 THROW(vmSymbols::java_lang_NullPointerException()); 294 } 295 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 296 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 297 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 298 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 299 // Do copy 300 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 301 JVM_END 302 303 304 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 305 JavaValue r(T_OBJECT); 306 // public synchronized Object put(Object key, Object value); 307 HandleMark hm(THREAD); 308 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 309 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK); 310 JavaCalls::call_virtual(&r, 311 props, 312 vmClasses::Properties_klass(), 313 vmSymbols::put_name(), 314 vmSymbols::object_object_object_signature(), 315 key_str, 316 value_str, 317 THREAD); 318 } 319 320 321 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 322 323 /* 324 * Return all of the system properties in a Java String array with alternating 325 * names and values from the jvm SystemProperty. 326 * Which includes some internal and all commandline -D defined properties. 327 */ 328 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 329 ResourceMark rm(THREAD); 330 HandleMark hm(THREAD); 331 int ndx = 0; 332 int fixedCount = 2; 333 334 SystemProperty* p = Arguments::system_properties(); 335 int count = Arguments::PropertyList_count(p); 336 337 // Allocate result String array 338 InstanceKlass* ik = vmClasses::String_klass(); 339 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 340 objArrayHandle result_h(THREAD, r); 341 342 while (p != nullptr) { 343 const char * key = p->key(); 344 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 345 const char * value = p->value(); 346 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 347 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL); 348 result_h->obj_at_put(ndx * 2, key_str()); 349 result_h->obj_at_put(ndx * 2 + 1, value_str()); 350 ndx++; 351 } 352 p = p->next(); 353 } 354 355 // Convert the -XX:MaxDirectMemorySize= command line flag 356 // to the sun.nio.MaxDirectMemorySize property. 357 // Do this after setting user properties to prevent people 358 // from setting the value with a -D option, as requested. 359 // Leave empty if not supplied 360 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 361 char as_chars[256]; 362 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 363 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 364 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 365 result_h->obj_at_put(ndx * 2, key_str()); 366 result_h->obj_at_put(ndx * 2 + 1, value_str()); 367 ndx++; 368 } 369 370 // JVM monitoring and management support 371 // Add the sun.management.compiler property for the compiler's name 372 { 373 #undef CSIZE 374 #if defined(_LP64) || defined(_WIN64) 375 #define CSIZE "64-Bit " 376 #else 377 #define CSIZE 378 #endif // 64bit 379 380 #if COMPILER1_AND_COMPILER2 381 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 382 #else 383 #if defined(COMPILER1) 384 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 385 #elif defined(COMPILER2) 386 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 387 #elif INCLUDE_JVMCI 388 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2" 389 #else 390 const char* compiler_name = ""; 391 #endif // compilers 392 #endif // COMPILER1_AND_COMPILER2 393 394 if (*compiler_name != '\0' && 395 (Arguments::mode() != Arguments::_int)) { 396 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 397 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 398 result_h->obj_at_put(ndx * 2, key_str()); 399 result_h->obj_at_put(ndx * 2 + 1, value_str()); 400 ndx++; 401 } 402 } 403 404 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 405 JVM_END 406 407 408 /* 409 * Return the temporary directory that the VM uses for the attach 410 * and perf data files. 411 * 412 * It is important that this directory is well-known and the 413 * same for all VM instances. It cannot be affected by configuration 414 * variables such as java.io.tmpdir. 415 */ 416 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 417 HandleMark hm(THREAD); 418 const char* temp_dir = os::get_temp_directory(); 419 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 420 return (jstring) JNIHandles::make_local(THREAD, h()); 421 JVM_END 422 423 424 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 425 426 extern volatile jint vm_created; 427 428 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 429 EventShutdown event; 430 if (event.should_commit()) { 431 event.set_reason("Shutdown requested from Java"); 432 event.commit(); 433 } 434 JVM_END 435 436 437 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 438 before_exit(thread, true); 439 vm_exit(code); 440 JVM_END 441 442 443 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 444 if (!DisableExplicitGC) { 445 EventSystemGC event; 446 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent); 447 Universe::heap()->collect(GCCause::_java_lang_system_gc); 448 event.commit(); 449 } 450 JVM_END 451 452 453 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 454 return Universe::heap()->millis_since_last_whole_heap_examined(); 455 JVM_END 456 457 458 static inline jlong convert_size_t_to_jlong(size_t val) { 459 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 460 NOT_LP64 (return (jlong)val;) 461 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 462 } 463 464 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 465 size_t n = Universe::heap()->capacity(); 466 return convert_size_t_to_jlong(n); 467 JVM_END 468 469 470 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 471 size_t n = Universe::heap()->unused(); 472 return convert_size_t_to_jlong(n); 473 JVM_END 474 475 476 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 477 size_t n = Universe::heap()->max_capacity(); 478 return convert_size_t_to_jlong(n); 479 JVM_END 480 481 482 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 483 return os::active_processor_count(); 484 JVM_END 485 486 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void)) 487 #ifdef LINUX 488 if (UseContainerSupport) { 489 return JNI_TRUE; 490 } 491 #endif 492 return JNI_FALSE; 493 JVM_END 494 495 // java.lang.Throwable ////////////////////////////////////////////////////// 496 497 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 498 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 499 java_lang_Throwable::fill_in_stack_trace(exception); 500 JVM_END 501 502 // java.lang.NullPointerException /////////////////////////////////////////// 503 504 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 505 if (!ShowCodeDetailsInExceptionMessages) return nullptr; 506 507 oop exc = JNIHandles::resolve_non_null(throwable); 508 509 Method* method; 510 int bci; 511 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 512 return nullptr; 513 } 514 if (method->is_native()) { 515 return nullptr; 516 } 517 518 stringStream ss; 519 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 520 if (ok) { 521 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 522 return (jstring) JNIHandles::make_local(THREAD, result); 523 } else { 524 return nullptr; 525 } 526 JVM_END 527 528 // java.lang.StackTraceElement ////////////////////////////////////////////// 529 530 531 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth)) 532 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace)); 533 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 534 objArrayHandle stack_trace(THREAD, st); 535 // Fill in the allocated stack trace 536 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK); 537 JVM_END 538 539 540 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 541 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 542 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 543 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 544 JVM_END 545 546 547 // java.lang.StackWalker ////////////////////////////////////////////////////// 548 549 550 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 551 jint skip_frames, jobject contScope, jobject cont, 552 jint frame_count, jint start_index, jobjectArray frames)) 553 if (!thread->has_last_Java_frame()) { 554 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr); 555 } 556 557 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 558 Handle contScope_h(THREAD, JNIHandles::resolve(contScope)); 559 Handle cont_h(THREAD, JNIHandles::resolve(cont)); 560 // frames array is a Class<?>[] array when only getting caller reference, 561 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 562 // be null. 563 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 564 objArrayHandle frames_array_h(THREAD, fa); 565 566 int limit = start_index + frame_count; 567 if (frames_array_h->length() < limit) { 568 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr); 569 } 570 571 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h, 572 frame_count, start_index, frames_array_h, CHECK_NULL); 573 return JNIHandles::make_local(THREAD, result); 574 JVM_END 575 576 577 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 578 jint frame_count, jint start_index, 579 jobjectArray frames)) 580 // frames array is a Class<?>[] array when only getting caller reference, 581 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 582 // be null. 583 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 584 objArrayHandle frames_array_h(THREAD, fa); 585 586 int limit = start_index+frame_count; 587 if (frames_array_h->length() < limit) { 588 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 589 } 590 591 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 592 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 593 start_index, frames_array_h, THREAD); 594 JVM_END 595 596 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont)) 597 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 598 objArrayHandle frames_array_h(THREAD, fa); 599 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 600 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont)); 601 602 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD); 603 JVM_END 604 605 // java.lang.Object /////////////////////////////////////////////// 606 607 608 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 609 // as implemented in the classic virtual machine; return 0 if object is null 610 return handle == nullptr ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 611 JVM_END 612 613 614 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 615 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 616 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 617 if (JvmtiExport::should_post_monitor_wait()) { 618 JvmtiExport::post_monitor_wait(thread, obj(), ms); 619 620 // The current thread already owns the monitor and it has not yet 621 // been added to the wait queue so the current thread cannot be 622 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 623 // event handler cannot accidentally consume an unpark() meant for 624 // the ParkEvent associated with this ObjectMonitor. 625 } 626 ObjectSynchronizer::wait(obj, ms, CHECK); 627 JVM_END 628 629 630 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 631 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 632 ObjectSynchronizer::notify(obj, CHECK); 633 JVM_END 634 635 636 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 637 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 638 ObjectSynchronizer::notifyall(obj, CHECK); 639 JVM_END 640 641 642 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 643 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 644 Klass* klass = obj->klass(); 645 JvmtiVMObjectAllocEventCollector oam; 646 647 #ifdef ASSERT 648 // Just checking that the cloneable flag is set correct 649 if (obj->is_array()) { 650 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 651 } else { 652 guarantee(obj->is_instance(), "should be instanceOop"); 653 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 654 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 655 } 656 #endif 657 658 // Check if class of obj supports the Cloneable interface. 659 // All arrays are considered to be cloneable (See JLS 20.1.5). 660 // All j.l.r.Reference classes are considered non-cloneable. 661 if (!klass->is_cloneable() || 662 (klass->is_instance_klass() && 663 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 664 ResourceMark rm(THREAD); 665 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 666 } 667 668 // Make shallow object copy 669 const size_t size = obj->size(); 670 oop new_obj_oop = nullptr; 671 if (obj->is_array()) { 672 const int length = ((arrayOop)obj())->length(); 673 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 674 /* do_zero */ true, CHECK_NULL); 675 } else { 676 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 677 } 678 679 HeapAccess<>::clone(obj(), new_obj_oop, size); 680 681 Handle new_obj(THREAD, new_obj_oop); 682 // Caution: this involves a java upcall, so the clone should be 683 // "gc-robust" by this stage. 684 if (klass->has_finalizer()) { 685 assert(obj->is_instance(), "should be instanceOop"); 686 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 687 new_obj = Handle(THREAD, new_obj_oop); 688 } 689 690 return JNIHandles::make_local(THREAD, new_obj()); 691 JVM_END 692 693 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 694 695 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 696 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 697 JVM_END 698 699 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 700 return InstanceKlass::is_finalization_enabled(); 701 JVM_END 702 703 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 704 705 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 706 CONT_RegisterNativeMethods(env, cls); 707 JVM_END 708 709 // java.io.File /////////////////////////////////////////////////////////////// 710 711 JVM_LEAF(char*, JVM_NativePath(char* path)) 712 return os::native_path(path); 713 JVM_END 714 715 716 // Misc. class handling /////////////////////////////////////////////////////////// 717 718 719 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 720 // Getting the class of the caller frame. 721 // 722 // The call stack at this point looks something like this: 723 // 724 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 725 // [1] [ @CallerSensitive API.method ] 726 // [.] [ (skipped intermediate frames) ] 727 // [n] [ caller ] 728 vframeStream vfst(thread); 729 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 730 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 731 Method* m = vfst.method(); 732 assert(m != nullptr, "sanity"); 733 switch (n) { 734 case 0: 735 // This must only be called from Reflection.getCallerClass 736 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 737 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 738 } 739 // fall-through 740 case 1: 741 // Frame 0 and 1 must be caller sensitive. 742 if (!m->caller_sensitive()) { 743 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 744 } 745 break; 746 default: 747 if (!m->is_ignored_by_security_stack_walk()) { 748 // We have reached the desired frame; return the holder class. 749 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 750 } 751 break; 752 } 753 } 754 return nullptr; 755 JVM_END 756 757 758 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 759 oop mirror = nullptr; 760 BasicType t = name2type(utf); 761 if (t != T_ILLEGAL && !is_reference_type(t)) { 762 mirror = Universe::java_mirror(t); 763 } 764 if (mirror == nullptr) { 765 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 766 } else { 767 return (jclass) JNIHandles::make_local(THREAD, mirror); 768 } 769 JVM_END 770 771 772 // Returns a class loaded by the bootstrap class loader; or null 773 // if not found. ClassNotFoundException is not thrown. 774 // FindClassFromBootLoader is exported to the launcher for windows. 775 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 776 const char* name)) 777 // Java libraries should ensure that name is never null or illegal. 778 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 779 // It's impossible to create this class; the name cannot fit 780 // into the constant pool. 781 return nullptr; 782 } 783 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name"); 784 785 TempNewSymbol h_name = SymbolTable::new_symbol(name); 786 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 787 if (k == nullptr) { 788 return nullptr; 789 } 790 791 if (log_is_enabled(Debug, class, resolve)) { 792 trace_class_resolution(k); 793 } 794 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 795 JVM_END 796 797 // Find a class with this name in this loader, using the caller's protection domain. 798 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 799 jboolean init, jobject loader, 800 jclass caller)) 801 TempNewSymbol h_name = 802 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 803 CHECK_NULL); 804 805 oop loader_oop = JNIHandles::resolve(loader); 806 oop from_class = JNIHandles::resolve(caller); 807 oop protection_domain = nullptr; 808 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 809 // NPE. Put it in another way, the bootstrap class loader has all permission and 810 // thus no checkPackageAccess equivalence in the VM class loader. 811 // The caller is also passed as null by the java code if there is no security 812 // manager to avoid the performance cost of getting the calling class. 813 if (from_class != nullptr && loader_oop != nullptr) { 814 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 815 } 816 817 Handle h_loader(THREAD, loader_oop); 818 Handle h_prot(THREAD, protection_domain); 819 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 820 h_prot, false, THREAD); 821 822 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 823 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 824 } 825 return result; 826 JVM_END 827 828 // Currently only called from the old verifier. 829 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 830 jboolean init, jclass from)) 831 TempNewSymbol h_name = 832 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 833 CHECK_NULL); 834 oop from_class_oop = JNIHandles::resolve(from); 835 Klass* from_class = (from_class_oop == nullptr) 836 ? (Klass*)nullptr 837 : java_lang_Class::as_Klass(from_class_oop); 838 oop class_loader = nullptr; 839 oop protection_domain = nullptr; 840 if (from_class != nullptr) { 841 class_loader = from_class->class_loader(); 842 protection_domain = from_class->protection_domain(); 843 } 844 Handle h_loader(THREAD, class_loader); 845 Handle h_prot (THREAD, protection_domain); 846 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 847 h_prot, true, thread); 848 849 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 850 // this function is generally only used for class loading during verification. 851 ResourceMark rm; 852 oop from_mirror = JNIHandles::resolve_non_null(from); 853 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 854 const char * from_name = from_class->external_name(); 855 856 oop mirror = JNIHandles::resolve_non_null(result); 857 Klass* to_class = java_lang_Class::as_Klass(mirror); 858 const char * to = to_class->external_name(); 859 log_debug(class, resolve)("%s %s (verification)", from_name, to); 860 } 861 862 return result; 863 JVM_END 864 865 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 866 static jclass jvm_define_class_common(const char *name, 867 jobject loader, const jbyte *buf, 868 jsize len, jobject pd, const char *source, 869 TRAPS) { 870 if (source == nullptr) source = "__JVM_DefineClass__"; 871 872 JavaThread* jt = THREAD; 873 874 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 875 ClassLoader::perf_define_appclass_selftime(), 876 ClassLoader::perf_define_appclasses(), 877 jt->get_thread_stat()->perf_recursion_counts_addr(), 878 jt->get_thread_stat()->perf_timers_addr(), 879 PerfClassTraceTime::DEFINE_CLASS); 880 881 if (UsePerfData) { 882 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 883 } 884 885 // Class resolution will get the class name from the .class stream if the name is null. 886 TempNewSymbol class_name = name == nullptr ? nullptr : 887 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 888 CHECK_NULL); 889 890 ResourceMark rm(THREAD); 891 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 892 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 893 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 894 ClassLoadInfo cl_info(protection_domain); 895 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 896 class_loader, 897 cl_info, 898 CHECK_NULL); 899 900 if (log_is_enabled(Debug, class, resolve)) { 901 trace_class_resolution(k); 902 } 903 904 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 905 } 906 907 enum { 908 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 909 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 910 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 911 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 912 }; 913 914 /* 915 * Define a class with the specified flags that indicates if it's a nestmate, 916 * hidden, or strongly referenced from class loader. 917 */ 918 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 919 const jbyte *buf, jsize len, jobject pd, 920 jboolean init, int flags, jobject classData, TRAPS) { 921 ResourceMark rm(THREAD); 922 923 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup)); 924 // Lookup class must be a non-null instance 925 if (lookup_k == nullptr) { 926 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 927 } 928 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass"); 929 930 Handle class_loader (THREAD, lookup_k->class_loader()); 931 932 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 933 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 934 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 935 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 936 937 InstanceKlass* host_class = nullptr; 938 if (is_nestmate) { 939 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL); 940 } 941 942 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 943 name, 944 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 945 is_nestmate ? host_class->external_name() : "", 946 is_hidden ? "hidden" : "not hidden", 947 is_strong ? "strong" : "weak", 948 vm_annotations ? "with vm annotations" : "without vm annotation"); 949 950 if (!is_hidden) { 951 // classData is only applicable for hidden classes 952 if (classData != nullptr) { 953 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 954 } 955 if (is_nestmate) { 956 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 957 } 958 if (!is_strong) { 959 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 960 } 961 if (vm_annotations) { 962 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 963 } 964 if (flags != STRONG_LOADER_LINK) { 965 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 966 err_msg("invalid flag 0x%x", flags)); 967 } 968 } 969 970 // Class resolution will get the class name from the .class stream if the name is null. 971 TempNewSymbol class_name = name == nullptr ? nullptr : 972 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 973 CHECK_NULL); 974 975 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 976 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 977 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 978 979 InstanceKlass* ik = nullptr; 980 if (!is_hidden) { 981 ClassLoadInfo cl_info(protection_domain); 982 ik = SystemDictionary::resolve_from_stream(&st, class_name, 983 class_loader, 984 cl_info, 985 CHECK_NULL); 986 987 if (log_is_enabled(Debug, class, resolve)) { 988 trace_class_resolution(ik); 989 } 990 } else { // hidden 991 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 992 ClassLoadInfo cl_info(protection_domain, 993 host_class, 994 classData_h, 995 is_hidden, 996 is_strong, 997 vm_annotations); 998 ik = SystemDictionary::resolve_from_stream(&st, class_name, 999 class_loader, 1000 cl_info, 1001 CHECK_NULL); 1002 1003 // The hidden class loader data has been artificially been kept alive to 1004 // this point. The mirror and any instances of this class have to keep 1005 // it alive afterwards. 1006 ik->class_loader_data()->dec_keep_alive(); 1007 1008 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1009 ModuleEntry* module = ik->module(); 1010 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1011 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1012 module_name, 1013 ik->external_name(), 1014 host_class->external_name(), 1015 ik->is_hidden() ? "is hidden" : "is not hidden"); 1016 } 1017 } 1018 assert(Reflection::is_same_class_package(lookup_k, ik), 1019 "lookup class and defined class are in different packages"); 1020 1021 if (init) { 1022 ik->initialize(CHECK_NULL); 1023 } else { 1024 ik->link_class(CHECK_NULL); 1025 } 1026 1027 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1028 } 1029 1030 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1031 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1032 JVM_END 1033 1034 /* 1035 * Define a class with the specified lookup class. 1036 * lookup: Lookup class 1037 * name: the name of the class 1038 * buf: class bytes 1039 * len: length of class bytes 1040 * pd: protection domain 1041 * init: initialize the class 1042 * flags: properties of the class 1043 * classData: private static pre-initialized field 1044 */ 1045 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1046 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1047 1048 if (lookup == nullptr) { 1049 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1050 } 1051 1052 assert(buf != nullptr, "buf must not be null"); 1053 1054 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1055 JVM_END 1056 1057 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1058 1059 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1060 JVM_END 1061 1062 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1063 ResourceMark rm(THREAD); 1064 1065 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1066 char* str = java_lang_String::as_utf8_string(h_name()); 1067 1068 // Sanity check, don't expect null 1069 if (str == nullptr) return nullptr; 1070 1071 // Internalize the string, converting '.' to '/' in string. 1072 char* p = (char*)str; 1073 while (*p != '\0') { 1074 if (*p == '.') { 1075 *p = '/'; 1076 } 1077 p++; 1078 } 1079 1080 const int str_len = (int)(p - str); 1081 if (str_len > Symbol::max_length()) { 1082 // It's impossible to create this class; the name cannot fit 1083 // into the constant pool. 1084 return nullptr; 1085 } 1086 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1087 1088 // Security Note: 1089 // The Java level wrapper will perform the necessary security check allowing 1090 // us to pass the null as the initiating class loader. 1091 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1092 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, 1093 h_loader, 1094 Handle()); 1095 #if INCLUDE_CDS 1096 if (k == nullptr) { 1097 // If the class is not already loaded, try to see if it's in the shared 1098 // archive for the current classloader (h_loader). 1099 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1100 } 1101 #endif 1102 return (k == nullptr) ? nullptr : 1103 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1104 JVM_END 1105 1106 // Module support ////////////////////////////////////////////////////////////////////////////// 1107 1108 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1109 jstring location, jobjectArray packages)) 1110 Handle h_module (THREAD, JNIHandles::resolve(module)); 1111 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1112 JVM_END 1113 1114 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1115 Handle h_module (THREAD, JNIHandles::resolve(module)); 1116 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1117 JVM_END 1118 1119 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1120 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1121 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1122 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1123 JVM_END 1124 1125 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1126 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1127 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1128 JVM_END 1129 1130 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1131 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1132 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1133 JVM_END 1134 1135 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1136 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1137 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1138 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1139 JVM_END 1140 1141 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1142 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1143 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1144 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1145 JVM_END 1146 1147 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1148 1149 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1150 assert (cls != nullptr, "illegal class"); 1151 JvmtiVMObjectAllocEventCollector oam; 1152 ResourceMark rm(THREAD); 1153 HandleMark hm(THREAD); 1154 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1155 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1156 return (jstring) JNIHandles::make_local(THREAD, result); 1157 JVM_END 1158 1159 1160 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1161 JvmtiVMObjectAllocEventCollector oam; 1162 oop mirror = JNIHandles::resolve_non_null(cls); 1163 1164 // Special handling for primitive objects 1165 if (java_lang_Class::is_primitive(mirror)) { 1166 // Primitive objects does not have any interfaces 1167 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1168 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1169 } 1170 1171 Klass* klass = java_lang_Class::as_Klass(mirror); 1172 // Figure size of result array 1173 int size; 1174 if (klass->is_instance_klass()) { 1175 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1176 } else { 1177 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1178 size = 2; 1179 } 1180 1181 // Allocate result array 1182 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1183 objArrayHandle result (THREAD, r); 1184 // Fill in result 1185 if (klass->is_instance_klass()) { 1186 // Regular instance klass, fill in all local interfaces 1187 for (int index = 0; index < size; index++) { 1188 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1189 result->obj_at_put(index, k->java_mirror()); 1190 } 1191 } else { 1192 // All arrays implement java.lang.Cloneable and java.io.Serializable 1193 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1194 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1195 } 1196 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1197 JVM_END 1198 1199 1200 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1201 oop mirror = JNIHandles::resolve_non_null(cls); 1202 if (java_lang_Class::is_primitive(mirror)) { 1203 return JNI_FALSE; 1204 } 1205 Klass* k = java_lang_Class::as_Klass(mirror); 1206 jboolean result = k->is_interface(); 1207 assert(!result || k->is_instance_klass(), 1208 "all interfaces are instance types"); 1209 // The compiler intrinsic for isInterface tests the 1210 // Klass::_access_flags bits in the same way. 1211 return result; 1212 JVM_END 1213 1214 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1215 oop mirror = JNIHandles::resolve_non_null(cls); 1216 if (java_lang_Class::is_primitive(mirror)) { 1217 return JNI_FALSE; 1218 } 1219 Klass* k = java_lang_Class::as_Klass(mirror); 1220 return k->is_hidden(); 1221 JVM_END 1222 1223 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1224 JvmtiVMObjectAllocEventCollector oam; 1225 oop mirror = JNIHandles::resolve_non_null(cls); 1226 if (java_lang_Class::is_primitive(mirror)) { 1227 // There are no signers for primitive types 1228 return nullptr; 1229 } 1230 1231 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror)); 1232 1233 // If there are no signers set in the class, or if the class 1234 // is an array, return null. 1235 if (signers == nullptr) return nullptr; 1236 1237 // copy of the signers array 1238 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1239 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1240 for (int index = 0; index < signers->length(); index++) { 1241 signers_copy->obj_at_put(index, signers->obj_at(index)); 1242 } 1243 1244 // return the copy 1245 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy); 1246 JVM_END 1247 1248 1249 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1250 oop mirror = JNIHandles::resolve_non_null(cls); 1251 if (!java_lang_Class::is_primitive(mirror)) { 1252 // This call is ignored for primitive types and arrays. 1253 // Signers are only set once, ClassLoader.java, and thus shouldn't 1254 // be called with an array. Only the bootstrap loader creates arrays. 1255 Klass* k = java_lang_Class::as_Klass(mirror); 1256 if (k->is_instance_klass()) { 1257 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1258 } 1259 } 1260 JVM_END 1261 1262 1263 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1264 oop mirror = JNIHandles::resolve_non_null(cls); 1265 if (mirror == nullptr) { 1266 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 1267 } 1268 1269 if (java_lang_Class::is_primitive(mirror)) { 1270 // Primitive types does not have a protection domain. 1271 return nullptr; 1272 } 1273 1274 oop pd = java_lang_Class::protection_domain(mirror); 1275 return (jobject) JNIHandles::make_local(THREAD, pd); 1276 JVM_END 1277 1278 1279 // Returns the inherited_access_control_context field of the running thread. 1280 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1281 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1282 return JNIHandles::make_local(THREAD, result); 1283 JVM_END 1284 1285 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1286 if (!UsePrivilegedStack) return nullptr; 1287 1288 ResourceMark rm(THREAD); 1289 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1290 JvmtiVMObjectAllocEventCollector oam; 1291 1292 // count the protection domains on the execution stack. We collapse 1293 // duplicate consecutive protection domains into a single one, as 1294 // well as stopping when we hit a privileged frame. 1295 1296 oop previous_protection_domain = nullptr; 1297 Handle privileged_context(thread, nullptr); 1298 bool is_privileged = false; 1299 oop protection_domain = nullptr; 1300 1301 // Iterate through Java frames 1302 vframeStream vfst(thread); 1303 for(; !vfst.at_end(); vfst.next()) { 1304 // get method of frame 1305 Method* method = vfst.method(); 1306 1307 // stop at the first privileged frame 1308 if (method->method_holder() == vmClasses::AccessController_klass() && 1309 method->name() == vmSymbols::executePrivileged_name()) 1310 { 1311 // this frame is privileged 1312 is_privileged = true; 1313 1314 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1315 1316 StackValueCollection* locals = priv->locals(); 1317 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1318 StackValue* clr_sv = locals->at(2); // Class<?> caller 1319 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1320 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1321 privileged_context = ctx_sv->get_obj(); 1322 Handle caller = clr_sv->get_obj(); 1323 1324 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1325 protection_domain = caller_klass->protection_domain(); 1326 } else { 1327 protection_domain = method->method_holder()->protection_domain(); 1328 } 1329 1330 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) { 1331 local_array->push(Handle(thread, protection_domain)); 1332 previous_protection_domain = protection_domain; 1333 } 1334 1335 if (is_privileged) break; 1336 } 1337 1338 1339 // either all the domains on the stack were system domains, or 1340 // we had a privileged system domain 1341 if (local_array->is_empty()) { 1342 if (is_privileged && privileged_context.is_null()) return nullptr; 1343 1344 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1345 return JNIHandles::make_local(THREAD, result); 1346 } 1347 1348 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(), 1349 local_array->length(), CHECK_NULL); 1350 objArrayHandle h_context(thread, context); 1351 for (int index = 0; index < local_array->length(); index++) { 1352 h_context->obj_at_put(index, local_array->at(index)()); 1353 } 1354 1355 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1356 1357 return JNIHandles::make_local(THREAD, result); 1358 JVM_END 1359 1360 class ScopedValueBindingsResolver { 1361 public: 1362 InstanceKlass* Carrier_klass; 1363 ScopedValueBindingsResolver(JavaThread* THREAD) { 1364 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_incubator_concurrent_ScopedValue_Carrier(), true, THREAD); 1365 Carrier_klass = InstanceKlass::cast(k); 1366 } 1367 }; 1368 1369 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1370 ResourceMark rm(THREAD); 1371 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1372 JvmtiVMObjectAllocEventCollector oam; 1373 1374 static ScopedValueBindingsResolver resolver(THREAD); 1375 1376 // Iterate through Java frames 1377 vframeStream vfst(thread); 1378 for(; !vfst.at_end(); vfst.next()) { 1379 int loc = -1; 1380 // get method of frame 1381 Method* method = vfst.method(); 1382 1383 Symbol *name = method->name(); 1384 1385 InstanceKlass* holder = method->method_holder(); 1386 if (name == vmSymbols::runWith_method_name()) { 1387 if ((holder == resolver.Carrier_klass 1388 || holder == vmClasses::VirtualThread_klass() 1389 || holder == vmClasses::Thread_klass())) { 1390 loc = 1; 1391 } 1392 } 1393 1394 if (loc != -1) { 1395 javaVFrame *frame = vfst.asJavaVFrame(); 1396 StackValueCollection* locals = frame->locals(); 1397 StackValue* head_sv = locals->at(loc); // jdk/incubator/concurrent/ScopedValue$Snapshot 1398 Handle result = head_sv->get_obj(); 1399 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1400 if (result() != nullptr) { 1401 return JNIHandles::make_local(THREAD, result()); 1402 } 1403 } 1404 } 1405 1406 return nullptr; 1407 JVM_END 1408 1409 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1410 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1411 return (k != nullptr) && k->is_array_klass() ? true : false; 1412 JVM_END 1413 1414 1415 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1416 oop mirror = JNIHandles::resolve_non_null(cls); 1417 return (jboolean) java_lang_Class::is_primitive(mirror); 1418 JVM_END 1419 1420 1421 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1422 oop mirror = JNIHandles::resolve_non_null(cls); 1423 if (java_lang_Class::is_primitive(mirror)) { 1424 // Primitive type 1425 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1426 } 1427 1428 Klass* k = java_lang_Class::as_Klass(mirror); 1429 debug_only(int computed_modifiers = k->compute_modifier_flags()); 1430 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1431 return k->modifier_flags(); 1432 JVM_END 1433 1434 1435 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1436 1437 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1438 JvmtiVMObjectAllocEventCollector oam; 1439 // ofClass is a reference to a java_lang_Class object. The mirror object 1440 // of an InstanceKlass 1441 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1442 if (java_lang_Class::is_primitive(ofMirror) || 1443 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1444 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1445 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1446 } 1447 1448 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1449 InnerClassesIterator iter(k); 1450 1451 if (iter.length() == 0) { 1452 // Neither an inner nor outer class 1453 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1454 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1455 } 1456 1457 // find inner class info 1458 constantPoolHandle cp(thread, k->constants()); 1459 int length = iter.length(); 1460 1461 // Allocate temp. result array 1462 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL); 1463 objArrayHandle result (THREAD, r); 1464 int members = 0; 1465 1466 for (; !iter.done(); iter.next()) { 1467 int ioff = iter.inner_class_info_index(); 1468 int ooff = iter.outer_class_info_index(); 1469 1470 if (ioff != 0 && ooff != 0) { 1471 // Check to see if the name matches the class we're looking for 1472 // before attempting to find the class. 1473 if (cp->klass_name_at_matches(k, ooff)) { 1474 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1475 if (outer_klass == k) { 1476 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1477 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1478 1479 // Throws an exception if outer klass has not declared k as 1480 // an inner klass 1481 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1482 1483 result->obj_at_put(members, inner_klass->java_mirror()); 1484 members++; 1485 } 1486 } 1487 } 1488 } 1489 1490 if (members != length) { 1491 // Return array of right length 1492 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL); 1493 for(int i = 0; i < members; i++) { 1494 res->obj_at_put(i, result->obj_at(i)); 1495 } 1496 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1497 } 1498 1499 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1500 JVM_END 1501 1502 1503 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1504 { 1505 // ofClass is a reference to a java_lang_Class object. 1506 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1507 if (java_lang_Class::is_primitive(ofMirror)) { 1508 return nullptr; 1509 } 1510 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1511 if (!klass->is_instance_klass()) { 1512 return nullptr; 1513 } 1514 1515 bool inner_is_member = false; 1516 Klass* outer_klass 1517 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1518 if (outer_klass == nullptr) return nullptr; // already a top-level class 1519 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1520 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1521 } 1522 JVM_END 1523 1524 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1525 { 1526 oop mirror = JNIHandles::resolve_non_null(cls); 1527 if (java_lang_Class::is_primitive(mirror)) { 1528 return nullptr; 1529 } 1530 Klass* klass = java_lang_Class::as_Klass(mirror); 1531 if (!klass->is_instance_klass()) { 1532 return nullptr; 1533 } 1534 InstanceKlass* k = InstanceKlass::cast(klass); 1535 int ooff = 0, noff = 0; 1536 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1537 if (noff != 0) { 1538 constantPoolHandle i_cp(thread, k->constants()); 1539 Symbol* name = i_cp->symbol_at(noff); 1540 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1541 return (jstring) JNIHandles::make_local(THREAD, str()); 1542 } 1543 } 1544 return nullptr; 1545 } 1546 JVM_END 1547 1548 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1549 assert (cls != nullptr, "illegal class"); 1550 JvmtiVMObjectAllocEventCollector oam; 1551 ResourceMark rm(THREAD); 1552 oop mirror = JNIHandles::resolve_non_null(cls); 1553 // Return null for arrays and primitives 1554 if (!java_lang_Class::is_primitive(mirror)) { 1555 Klass* k = java_lang_Class::as_Klass(mirror); 1556 if (k->is_instance_klass()) { 1557 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1558 if (sym == nullptr) return nullptr; 1559 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1560 return (jstring) JNIHandles::make_local(THREAD, str()); 1561 } 1562 } 1563 return nullptr; 1564 JVM_END 1565 1566 1567 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1568 assert (cls != nullptr, "illegal class"); 1569 oop mirror = JNIHandles::resolve_non_null(cls); 1570 // Return null for arrays and primitives 1571 if (!java_lang_Class::is_primitive(mirror)) { 1572 Klass* k = java_lang_Class::as_Klass(mirror); 1573 if (k->is_instance_klass()) { 1574 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1575 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1576 } 1577 } 1578 return nullptr; 1579 JVM_END 1580 1581 1582 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1583 // some of this code was adapted from from jni_FromReflectedField 1584 1585 oop reflected = JNIHandles::resolve_non_null(field); 1586 oop mirror = java_lang_reflect_Field::clazz(reflected); 1587 Klass* k = java_lang_Class::as_Klass(mirror); 1588 int slot = java_lang_reflect_Field::slot(reflected); 1589 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1590 1591 InstanceKlass* ik = InstanceKlass::cast(k); 1592 intptr_t offset = ik->field_offset(slot); 1593 1594 if (modifiers & JVM_ACC_STATIC) { 1595 // for static fields we only look in the current class 1596 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1597 assert(false, "cannot find static field"); 1598 return false; 1599 } 1600 } else { 1601 // for instance fields we start with the current class and work 1602 // our way up through the superclass chain 1603 if (!ik->find_field_from_offset(offset, false, &fd)) { 1604 assert(false, "cannot find instance field"); 1605 return false; 1606 } 1607 } 1608 return true; 1609 } 1610 1611 static Method* jvm_get_method_common(jobject method) { 1612 // some of this code was adapted from from jni_FromReflectedMethod 1613 1614 oop reflected = JNIHandles::resolve_non_null(method); 1615 oop mirror = nullptr; 1616 int slot = 0; 1617 1618 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1619 mirror = java_lang_reflect_Constructor::clazz(reflected); 1620 slot = java_lang_reflect_Constructor::slot(reflected); 1621 } else { 1622 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1623 "wrong type"); 1624 mirror = java_lang_reflect_Method::clazz(reflected); 1625 slot = java_lang_reflect_Method::slot(reflected); 1626 } 1627 Klass* k = java_lang_Class::as_Klass(mirror); 1628 1629 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1630 assert(m != nullptr, "cannot find method"); 1631 return m; // caller has to deal with null in product mode 1632 } 1633 1634 /* Type use annotations support (JDK 1.8) */ 1635 1636 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1637 assert (cls != nullptr, "illegal class"); 1638 ResourceMark rm(THREAD); 1639 // Return null for arrays and primitives 1640 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1641 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1642 if (k->is_instance_klass()) { 1643 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1644 if (type_annotations != nullptr) { 1645 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1646 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1647 } 1648 } 1649 } 1650 return nullptr; 1651 JVM_END 1652 1653 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1654 assert (method != nullptr, "illegal method"); 1655 // method is a handle to a java.lang.reflect.Method object 1656 Method* m = jvm_get_method_common(method); 1657 if (m == nullptr) { 1658 return nullptr; 1659 } 1660 1661 AnnotationArray* type_annotations = m->type_annotations(); 1662 if (type_annotations != nullptr) { 1663 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1664 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1665 } 1666 1667 return nullptr; 1668 JVM_END 1669 1670 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1671 assert (field != nullptr, "illegal field"); 1672 fieldDescriptor fd; 1673 bool gotFd = jvm_get_field_common(field, fd); 1674 if (!gotFd) { 1675 return nullptr; 1676 } 1677 1678 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1679 JVM_END 1680 1681 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1682 if (!cp->is_within_bounds(index)) { 1683 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1684 } 1685 } 1686 1687 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1688 { 1689 // method is a handle to a java.lang.reflect.Method object 1690 Method* method_ptr = jvm_get_method_common(method); 1691 methodHandle mh (THREAD, method_ptr); 1692 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1693 const int num_params = mh->method_parameters_length(); 1694 1695 if (num_params < 0) { 1696 // A -1 return value from method_parameters_length means there is no 1697 // parameter data. Return null to indicate this to the reflection 1698 // API. 1699 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1700 return (jobjectArray)nullptr; 1701 } else { 1702 // Otherwise, we return something up to reflection, even if it is 1703 // a zero-length array. Why? Because in some cases this can 1704 // trigger a MalformedParametersException. 1705 1706 // make sure all the symbols are properly formatted 1707 for (int i = 0; i < num_params; i++) { 1708 MethodParametersElement* params = mh->method_parameters_start(); 1709 int index = params[i].name_cp_index; 1710 constantPoolHandle cp(THREAD, mh->constants()); 1711 bounds_check(cp, index, CHECK_NULL); 1712 1713 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1714 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1715 "Wrong type at constant pool index"); 1716 } 1717 1718 } 1719 1720 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1721 objArrayHandle result (THREAD, result_oop); 1722 1723 for (int i = 0; i < num_params; i++) { 1724 MethodParametersElement* params = mh->method_parameters_start(); 1725 // For a 0 index, give a null symbol 1726 Symbol* sym = 0 != params[i].name_cp_index ? 1727 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1728 int flags = params[i].flags; 1729 oop param = Reflection::new_parameter(reflected_method, i, sym, 1730 flags, CHECK_NULL); 1731 result->obj_at_put(i, param); 1732 } 1733 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1734 } 1735 } 1736 JVM_END 1737 1738 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1739 1740 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1741 { 1742 JvmtiVMObjectAllocEventCollector oam; 1743 1744 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1745 // Exclude primitive types and array types 1746 if (java_lang_Class::is_primitive(ofMirror) || 1747 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1748 // Return empty array 1749 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1750 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1751 } 1752 1753 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1754 constantPoolHandle cp(THREAD, k->constants()); 1755 1756 // Ensure class is linked 1757 k->link_class(CHECK_NULL); 1758 1759 // Allocate result 1760 int num_fields; 1761 1762 if (publicOnly) { 1763 num_fields = 0; 1764 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1765 if (fs.access_flags().is_public()) ++num_fields; 1766 } 1767 } else { 1768 num_fields = k->java_fields_count(); 1769 } 1770 1771 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1772 objArrayHandle result (THREAD, r); 1773 1774 int out_idx = 0; 1775 fieldDescriptor fd; 1776 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1777 if (!publicOnly || fs.access_flags().is_public()) { 1778 fd.reinitialize(k, fs.index()); 1779 oop field = Reflection::new_field(&fd, CHECK_NULL); 1780 result->obj_at_put(out_idx, field); 1781 ++out_idx; 1782 } 1783 } 1784 assert(out_idx == num_fields, "just checking"); 1785 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1786 } 1787 JVM_END 1788 1789 // A class is a record if and only if it is final and a direct subclass of 1790 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1791 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1792 { 1793 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1794 if (k != nullptr && k->is_instance_klass()) { 1795 InstanceKlass* ik = InstanceKlass::cast(k); 1796 return ik->is_record(); 1797 } else { 1798 return false; 1799 } 1800 } 1801 JVM_END 1802 1803 // Returns an array containing the components of the Record attribute, 1804 // or null if the attribute is not present. 1805 // 1806 // Note that this function returns the components of the Record attribute 1807 // even if the class is not a record. 1808 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1809 { 1810 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1811 assert(c->is_instance_klass(), "must be"); 1812 InstanceKlass* ik = InstanceKlass::cast(c); 1813 1814 Array<RecordComponent*>* components = ik->record_components(); 1815 if (components != nullptr) { 1816 JvmtiVMObjectAllocEventCollector oam; 1817 constantPoolHandle cp(THREAD, ik->constants()); 1818 int length = components->length(); 1819 assert(length >= 0, "unexpected record_components length"); 1820 objArrayOop record_components = 1821 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1822 objArrayHandle components_h (THREAD, record_components); 1823 1824 for (int x = 0; x < length; x++) { 1825 RecordComponent* component = components->at(x); 1826 assert(component != nullptr, "unexpected null record component"); 1827 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1828 components_h->obj_at_put(x, component_oop); 1829 } 1830 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1831 } 1832 1833 return nullptr; 1834 } 1835 JVM_END 1836 1837 static bool select_method(const methodHandle& method, bool want_constructor) { 1838 if (want_constructor) { 1839 return (method->is_initializer() && !method->is_static()); 1840 } else { 1841 return (!method->is_initializer() && !method->is_overpass()); 1842 } 1843 } 1844 1845 static jobjectArray get_class_declared_methods_helper( 1846 JNIEnv *env, 1847 jclass ofClass, jboolean publicOnly, 1848 bool want_constructor, 1849 Klass* klass, TRAPS) { 1850 1851 JvmtiVMObjectAllocEventCollector oam; 1852 1853 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1854 // Exclude primitive types and array types 1855 if (java_lang_Class::is_primitive(ofMirror) 1856 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1857 // Return empty array 1858 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1859 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1860 } 1861 1862 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1863 1864 // Ensure class is linked 1865 k->link_class(CHECK_NULL); 1866 1867 Array<Method*>* methods = k->methods(); 1868 int methods_length = methods->length(); 1869 1870 // Save original method_idnum in case of redefinition, which can change 1871 // the idnum of obsolete methods. The new method will have the same idnum 1872 // but if we refresh the methods array, the counts will be wrong. 1873 ResourceMark rm(THREAD); 1874 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1875 int num_methods = 0; 1876 1877 for (int i = 0; i < methods_length; i++) { 1878 methodHandle method(THREAD, methods->at(i)); 1879 if (select_method(method, want_constructor)) { 1880 if (!publicOnly || method->is_public()) { 1881 idnums->push(method->method_idnum()); 1882 ++num_methods; 1883 } 1884 } 1885 } 1886 1887 // Allocate result 1888 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1889 objArrayHandle result (THREAD, r); 1890 1891 // Now just put the methods that we selected above, but go by their idnum 1892 // in case of redefinition. The methods can be redefined at any safepoint, 1893 // so above when allocating the oop array and below when creating reflect 1894 // objects. 1895 for (int i = 0; i < num_methods; i++) { 1896 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1897 if (method.is_null()) { 1898 // Method may have been deleted and seems this API can handle null 1899 // Otherwise should probably put a method that throws NSME 1900 result->obj_at_put(i, nullptr); 1901 } else { 1902 oop m; 1903 if (want_constructor) { 1904 m = Reflection::new_constructor(method, CHECK_NULL); 1905 } else { 1906 m = Reflection::new_method(method, false, CHECK_NULL); 1907 } 1908 result->obj_at_put(i, m); 1909 } 1910 } 1911 1912 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1913 } 1914 1915 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1916 { 1917 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1918 /*want_constructor*/ false, 1919 vmClasses::reflect_Method_klass(), THREAD); 1920 } 1921 JVM_END 1922 1923 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1924 { 1925 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1926 /*want_constructor*/ true, 1927 vmClasses::reflect_Constructor_klass(), THREAD); 1928 } 1929 JVM_END 1930 1931 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1932 { 1933 oop mirror = JNIHandles::resolve_non_null(cls); 1934 if (java_lang_Class::is_primitive(mirror)) { 1935 // Primitive type 1936 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1937 } 1938 1939 Klass* k = java_lang_Class::as_Klass(mirror); 1940 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1941 } 1942 JVM_END 1943 1944 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1945 { 1946 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1947 assert(c->is_instance_klass(), "must be"); 1948 InstanceKlass* ck = InstanceKlass::cast(c); 1949 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 1950 assert(m->is_instance_klass(), "must be"); 1951 InstanceKlass* mk = InstanceKlass::cast(m); 1952 return ck->has_nestmate_access_to(mk, THREAD); 1953 } 1954 JVM_END 1955 1956 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1957 { 1958 // current is not a primitive or array class 1959 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1960 assert(c->is_instance_klass(), "must be"); 1961 InstanceKlass* ck = InstanceKlass::cast(c); 1962 InstanceKlass* host = ck->nest_host(THREAD); 1963 return (jclass) (host == nullptr ? nullptr : 1964 JNIHandles::make_local(THREAD, host->java_mirror())); 1965 } 1966 JVM_END 1967 1968 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1969 { 1970 // current is not a primitive or array class 1971 ResourceMark rm(THREAD); 1972 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1973 assert(c->is_instance_klass(), "must be"); 1974 InstanceKlass* ck = InstanceKlass::cast(c); 1975 InstanceKlass* host = ck->nest_host(THREAD); 1976 1977 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 1978 ck->external_name(), host->external_name()); 1979 { 1980 JvmtiVMObjectAllocEventCollector oam; 1981 Array<u2>* members = host->nest_members(); 1982 int length = members == nullptr ? 0 : members->length(); 1983 1984 log_trace(class, nestmates)(" - host has %d listed nest members", length); 1985 1986 // nest host is first in the array so make it one bigger 1987 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 1988 length + 1, CHECK_NULL); 1989 objArrayHandle result(THREAD, r); 1990 result->obj_at_put(0, host->java_mirror()); 1991 if (length != 0) { 1992 int count = 0; 1993 for (int i = 0; i < length; i++) { 1994 int cp_index = members->at(i); 1995 Klass* k = host->constants()->klass_at(cp_index, THREAD); 1996 if (HAS_PENDING_EXCEPTION) { 1997 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 1998 return nullptr; // propagate VMEs 1999 } 2000 if (log_is_enabled(Trace, class, nestmates)) { 2001 stringStream ss; 2002 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2003 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2004 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2005 log_trace(class, nestmates)("%s", ss.as_string()); 2006 } 2007 CLEAR_PENDING_EXCEPTION; 2008 continue; 2009 } 2010 if (k->is_instance_klass()) { 2011 InstanceKlass* ik = InstanceKlass::cast(k); 2012 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2013 if (nest_host_k == host) { 2014 result->obj_at_put(count+1, k->java_mirror()); 2015 count++; 2016 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2017 } else { 2018 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2019 ik->external_name(), nest_host_k->external_name()); 2020 } 2021 } else { 2022 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2023 k->external_name()); 2024 } 2025 } 2026 if (count < length) { 2027 // we had invalid entries so we need to compact the array 2028 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2029 length + 1, count + 1); 2030 2031 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2032 count + 1, CHECK_NULL); 2033 objArrayHandle result2(THREAD, r2); 2034 for (int i = 0; i < count + 1; i++) { 2035 result2->obj_at_put(i, result->obj_at(i)); 2036 } 2037 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2038 } 2039 } 2040 else { 2041 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate"); 2042 } 2043 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2044 } 2045 } 2046 JVM_END 2047 2048 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2049 { 2050 oop mirror = JNIHandles::resolve_non_null(current); 2051 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2052 Klass* c = java_lang_Class::as_Klass(mirror); 2053 assert(c->is_instance_klass(), "must be"); 2054 InstanceKlass* ik = InstanceKlass::cast(c); 2055 ResourceMark rm(THREAD); 2056 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2057 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2058 if (ik->is_sealed()) { 2059 JvmtiVMObjectAllocEventCollector oam; 2060 Array<u2>* subclasses = ik->permitted_subclasses(); 2061 int length = subclasses->length(); 2062 2063 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2064 2065 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2066 length, CHECK_NULL); 2067 objArrayHandle result(THREAD, r); 2068 int count = 0; 2069 for (int i = 0; i < length; i++) { 2070 int cp_index = subclasses->at(i); 2071 Klass* k = ik->constants()->klass_at(cp_index, THREAD); 2072 if (HAS_PENDING_EXCEPTION) { 2073 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2074 return nullptr; // propagate VMEs 2075 } 2076 if (log_is_enabled(Trace, class, sealed)) { 2077 stringStream ss; 2078 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2079 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2080 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2081 log_trace(class, sealed)("%s", ss.as_string()); 2082 } 2083 2084 CLEAR_PENDING_EXCEPTION; 2085 continue; 2086 } 2087 if (k->is_instance_klass()) { 2088 result->obj_at_put(count++, k->java_mirror()); 2089 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2090 } 2091 } 2092 if (count < length) { 2093 // we had invalid entries so we need to compact the array 2094 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2095 count, CHECK_NULL); 2096 objArrayHandle result2(THREAD, r2); 2097 for (int i = 0; i < count; i++) { 2098 result2->obj_at_put(i, result->obj_at(i)); 2099 } 2100 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2101 } 2102 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2103 } else { 2104 return nullptr; 2105 } 2106 } 2107 JVM_END 2108 2109 // Constant pool access ////////////////////////////////////////////////////////// 2110 2111 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2112 { 2113 JvmtiVMObjectAllocEventCollector oam; 2114 oop mirror = JNIHandles::resolve_non_null(cls); 2115 // Return null for primitives and arrays 2116 if (!java_lang_Class::is_primitive(mirror)) { 2117 Klass* k = java_lang_Class::as_Klass(mirror); 2118 if (k->is_instance_klass()) { 2119 InstanceKlass* k_h = InstanceKlass::cast(k); 2120 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2121 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2122 return JNIHandles::make_local(THREAD, jcp()); 2123 } 2124 } 2125 return nullptr; 2126 } 2127 JVM_END 2128 2129 2130 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2131 { 2132 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2133 return cp->length(); 2134 } 2135 JVM_END 2136 2137 2138 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2139 { 2140 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2141 bounds_check(cp, index, CHECK_NULL); 2142 constantTag tag = cp->tag_at(index); 2143 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2144 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2145 } 2146 Klass* k = cp->klass_at(index, CHECK_NULL); 2147 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2148 } 2149 JVM_END 2150 2151 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2152 { 2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2154 bounds_check(cp, index, CHECK_NULL); 2155 constantTag tag = cp->tag_at(index); 2156 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2158 } 2159 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2160 if (k == nullptr) return nullptr; 2161 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2162 } 2163 JVM_END 2164 2165 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2166 constantTag tag = cp->tag_at(index); 2167 if (!tag.is_method() && !tag.is_interface_method()) { 2168 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2169 } 2170 int klass_ref = cp->uncached_klass_ref_index_at(index); 2171 Klass* k_o; 2172 if (force_resolution) { 2173 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2174 } else { 2175 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2176 if (k_o == nullptr) return nullptr; 2177 } 2178 InstanceKlass* k = InstanceKlass::cast(k_o); 2179 Symbol* name = cp->uncached_name_ref_at(index); 2180 Symbol* sig = cp->uncached_signature_ref_at(index); 2181 methodHandle m (THREAD, k->find_method(name, sig)); 2182 if (m.is_null()) { 2183 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2184 } 2185 oop method; 2186 if (!m->is_initializer() || m->is_static()) { 2187 method = Reflection::new_method(m, true, CHECK_NULL); 2188 } else { 2189 method = Reflection::new_constructor(m, CHECK_NULL); 2190 } 2191 return JNIHandles::make_local(THREAD, method); 2192 } 2193 2194 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2195 { 2196 JvmtiVMObjectAllocEventCollector oam; 2197 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2198 bounds_check(cp, index, CHECK_NULL); 2199 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2200 return res; 2201 } 2202 JVM_END 2203 2204 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2205 { 2206 JvmtiVMObjectAllocEventCollector oam; 2207 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2208 bounds_check(cp, index, CHECK_NULL); 2209 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2210 return res; 2211 } 2212 JVM_END 2213 2214 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2215 constantTag tag = cp->tag_at(index); 2216 if (!tag.is_field()) { 2217 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2218 } 2219 int klass_ref = cp->uncached_klass_ref_index_at(index); 2220 Klass* k_o; 2221 if (force_resolution) { 2222 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2223 } else { 2224 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2225 if (k_o == nullptr) return nullptr; 2226 } 2227 InstanceKlass* k = InstanceKlass::cast(k_o); 2228 Symbol* name = cp->uncached_name_ref_at(index); 2229 Symbol* sig = cp->uncached_signature_ref_at(index); 2230 fieldDescriptor fd; 2231 Klass* target_klass = k->find_field(name, sig, &fd); 2232 if (target_klass == nullptr) { 2233 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2234 } 2235 oop field = Reflection::new_field(&fd, CHECK_NULL); 2236 return JNIHandles::make_local(THREAD, field); 2237 } 2238 2239 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2240 { 2241 JvmtiVMObjectAllocEventCollector oam; 2242 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2243 bounds_check(cp, index, CHECK_NULL); 2244 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2245 return res; 2246 } 2247 JVM_END 2248 2249 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2250 { 2251 JvmtiVMObjectAllocEventCollector oam; 2252 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2253 bounds_check(cp, index, CHECK_NULL); 2254 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2255 return res; 2256 } 2257 JVM_END 2258 2259 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2260 { 2261 JvmtiVMObjectAllocEventCollector oam; 2262 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2263 bounds_check(cp, index, CHECK_NULL); 2264 constantTag tag = cp->tag_at(index); 2265 if (!tag.is_field_or_method()) { 2266 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2267 } 2268 int klass_ref = cp->uncached_klass_ref_index_at(index); 2269 Symbol* klass_name = cp->klass_name_at(klass_ref); 2270 Symbol* member_name = cp->uncached_name_ref_at(index); 2271 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2272 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2273 objArrayHandle dest(THREAD, dest_o); 2274 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2275 dest->obj_at_put(0, str()); 2276 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2277 dest->obj_at_put(1, str()); 2278 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2279 dest->obj_at_put(2, str()); 2280 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2281 } 2282 JVM_END 2283 2284 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2285 { 2286 JvmtiVMObjectAllocEventCollector oam; 2287 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2288 bounds_check(cp, index, CHECK_0); 2289 constantTag tag = cp->tag_at(index); 2290 if (!tag.is_field_or_method()) { 2291 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2292 } 2293 return (jint) cp->uncached_klass_ref_index_at(index); 2294 } 2295 JVM_END 2296 2297 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2298 { 2299 JvmtiVMObjectAllocEventCollector oam; 2300 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2301 bounds_check(cp, index, CHECK_0); 2302 constantTag tag = cp->tag_at(index); 2303 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2304 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2305 } 2306 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2307 } 2308 JVM_END 2309 2310 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2311 { 2312 JvmtiVMObjectAllocEventCollector oam; 2313 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2314 bounds_check(cp, index, CHECK_NULL); 2315 constantTag tag = cp->tag_at(index); 2316 if (!tag.is_name_and_type()) { 2317 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2318 } 2319 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2320 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2321 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2322 objArrayHandle dest(THREAD, dest_o); 2323 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2324 dest->obj_at_put(0, str()); 2325 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2326 dest->obj_at_put(1, str()); 2327 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2328 } 2329 JVM_END 2330 2331 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2332 { 2333 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2334 bounds_check(cp, index, CHECK_0); 2335 constantTag tag = cp->tag_at(index); 2336 if (!tag.is_int()) { 2337 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2338 } 2339 return cp->int_at(index); 2340 } 2341 JVM_END 2342 2343 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2344 { 2345 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2346 bounds_check(cp, index, CHECK_(0L)); 2347 constantTag tag = cp->tag_at(index); 2348 if (!tag.is_long()) { 2349 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2350 } 2351 return cp->long_at(index); 2352 } 2353 JVM_END 2354 2355 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2356 { 2357 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2358 bounds_check(cp, index, CHECK_(0.0f)); 2359 constantTag tag = cp->tag_at(index); 2360 if (!tag.is_float()) { 2361 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2362 } 2363 return cp->float_at(index); 2364 } 2365 JVM_END 2366 2367 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2368 { 2369 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2370 bounds_check(cp, index, CHECK_(0.0)); 2371 constantTag tag = cp->tag_at(index); 2372 if (!tag.is_double()) { 2373 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2374 } 2375 return cp->double_at(index); 2376 } 2377 JVM_END 2378 2379 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2380 { 2381 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2382 bounds_check(cp, index, CHECK_NULL); 2383 constantTag tag = cp->tag_at(index); 2384 if (!tag.is_string()) { 2385 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2386 } 2387 oop str = cp->string_at(index, CHECK_NULL); 2388 return (jstring) JNIHandles::make_local(THREAD, str); 2389 } 2390 JVM_END 2391 2392 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2393 { 2394 JvmtiVMObjectAllocEventCollector oam; 2395 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2396 bounds_check(cp, index, CHECK_NULL); 2397 constantTag tag = cp->tag_at(index); 2398 if (!tag.is_symbol()) { 2399 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2400 } 2401 Symbol* sym = cp->symbol_at(index); 2402 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2403 return (jstring) JNIHandles::make_local(THREAD, str()); 2404 } 2405 JVM_END 2406 2407 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2408 { 2409 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2410 bounds_check(cp, index, CHECK_0); 2411 constantTag tag = cp->tag_at(index); 2412 jbyte result = tag.value(); 2413 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2414 // they are changed to the corresponding tags from the JVM spec, so that java code in 2415 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2416 if (tag.is_klass_or_reference()) { 2417 result = JVM_CONSTANT_Class; 2418 } else if (tag.is_string_index()) { 2419 result = JVM_CONSTANT_String; 2420 } else if (tag.is_method_type_in_error()) { 2421 result = JVM_CONSTANT_MethodType; 2422 } else if (tag.is_method_handle_in_error()) { 2423 result = JVM_CONSTANT_MethodHandle; 2424 } else if (tag.is_dynamic_constant_in_error()) { 2425 result = JVM_CONSTANT_Dynamic; 2426 } 2427 return result; 2428 } 2429 JVM_END 2430 2431 // Assertion support. ////////////////////////////////////////////////////////// 2432 2433 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2434 assert(cls != nullptr, "bad class"); 2435 2436 oop r = JNIHandles::resolve(cls); 2437 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2438 if (java_lang_Class::is_primitive(r)) return false; 2439 2440 Klass* k = java_lang_Class::as_Klass(r); 2441 assert(k->is_instance_klass(), "must be an instance klass"); 2442 if (!k->is_instance_klass()) return false; 2443 2444 ResourceMark rm(THREAD); 2445 const char* name = k->name()->as_C_string(); 2446 bool system_class = k->class_loader() == nullptr; 2447 return JavaAssertions::enabled(name, system_class); 2448 2449 JVM_END 2450 2451 2452 // Return a new AssertionStatusDirectives object with the fields filled in with 2453 // command-line assertion arguments (i.e., -ea, -da). 2454 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2455 JvmtiVMObjectAllocEventCollector oam; 2456 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2457 return JNIHandles::make_local(THREAD, asd); 2458 JVM_END 2459 2460 // Verification //////////////////////////////////////////////////////////////////////////////// 2461 2462 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2463 2464 // RedefineClasses support: bug 6214132 caused verification to fail. 2465 // All functions from this section should call the jvmtiThreadSate function: 2466 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2467 // The function returns a Klass* of the _scratch_class if the verifier 2468 // was invoked in the middle of the class redefinition. 2469 // Otherwise it returns its argument value which is the _the_class Klass*. 2470 // Please, refer to the description in the jvmtiThreadSate.hpp. 2471 2472 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2473 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2474 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2475 return k->name()->as_utf8(); 2476 JVM_END 2477 2478 2479 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2480 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2481 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2482 // types will have length zero if this is not an InstanceKlass 2483 // (length is determined by call to JVM_GetClassCPEntriesCount) 2484 if (k->is_instance_klass()) { 2485 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2486 for (int index = cp->length() - 1; index >= 0; index--) { 2487 constantTag tag = cp->tag_at(index); 2488 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2489 } 2490 } 2491 JVM_END 2492 2493 2494 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2495 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2496 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2497 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2498 JVM_END 2499 2500 2501 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2502 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2503 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2504 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2505 JVM_END 2506 2507 2508 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2509 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2510 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2511 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2512 JVM_END 2513 2514 2515 // The following methods, used for the verifier, are never called with 2516 // array klasses, so a direct cast to InstanceKlass is safe. 2517 // Typically, these methods are called in a loop with bounds determined 2518 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2519 // zero for arrays. 2520 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2521 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2522 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2523 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2524 int length = method->checked_exceptions_length(); 2525 if (length > 0) { 2526 CheckedExceptionElement* table= method->checked_exceptions_start(); 2527 for (int i = 0; i < length; i++) { 2528 exceptions[i] = table[i].class_cp_index; 2529 } 2530 } 2531 JVM_END 2532 2533 2534 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2535 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2536 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2537 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2538 return method->checked_exceptions_length(); 2539 JVM_END 2540 2541 2542 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2544 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2545 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2546 memcpy(code, method->code_base(), method->code_size()); 2547 JVM_END 2548 2549 2550 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2551 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2552 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2553 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2554 return method->code_size(); 2555 JVM_END 2556 2557 2558 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2559 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2560 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2561 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2562 ExceptionTable extable(method); 2563 entry->start_pc = extable.start_pc(entry_index); 2564 entry->end_pc = extable.end_pc(entry_index); 2565 entry->handler_pc = extable.handler_pc(entry_index); 2566 entry->catchType = extable.catch_type_index(entry_index); 2567 JVM_END 2568 2569 2570 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2572 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2573 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2574 return method->exception_table_length(); 2575 JVM_END 2576 2577 2578 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2579 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2580 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2581 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2582 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2583 JVM_END 2584 2585 2586 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2587 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2588 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2589 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2590 JVM_END 2591 2592 2593 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2594 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2595 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2596 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2597 return method->max_locals(); 2598 JVM_END 2599 2600 2601 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2603 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2604 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2605 return method->size_of_parameters(); 2606 JVM_END 2607 2608 2609 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2610 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2611 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2612 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2613 return method->verifier_max_stack(); 2614 JVM_END 2615 2616 2617 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2618 ResourceMark rm(THREAD); 2619 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2620 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2621 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2622 return method->name() == vmSymbols::object_initializer_name(); 2623 JVM_END 2624 2625 2626 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2627 ResourceMark rm(THREAD); 2628 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2629 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2630 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2631 return method->is_overpass(); 2632 JVM_END 2633 2634 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2635 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2636 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2637 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2638 return method->name()->as_utf8(); 2639 JVM_END 2640 2641 2642 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2643 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2644 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2645 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2646 return method->signature()->as_utf8(); 2647 JVM_END 2648 2649 /** 2650 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2651 * read entries in the constant pool. Since the old verifier always 2652 * works on a copy of the code, it will not see any rewriting that 2653 * may possibly occur in the middle of verification. So it is important 2654 * that nothing it calls tries to use the cpCache instead of the raw 2655 * constant pool, so we must use cp->uncached_x methods when appropriate. 2656 */ 2657 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2658 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2659 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2660 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2661 switch (cp->tag_at(cp_index).value()) { 2662 case JVM_CONSTANT_Fieldref: 2663 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2664 default: 2665 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2666 } 2667 ShouldNotReachHere(); 2668 return nullptr; 2669 JVM_END 2670 2671 2672 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2673 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2674 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2675 ConstantPool* cp = InstanceKlass::cast(k)->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 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2690 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2691 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2692 switch (cp->tag_at(cp_index).value()) { 2693 case JVM_CONSTANT_InterfaceMethodref: 2694 case JVM_CONSTANT_Methodref: 2695 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2696 default: 2697 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2698 } 2699 ShouldNotReachHere(); 2700 return nullptr; 2701 JVM_END 2702 2703 2704 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2705 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2706 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2707 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2708 switch (cp->tag_at(cp_index).value()) { 2709 case JVM_CONSTANT_Fieldref: 2710 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2711 default: 2712 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2713 } 2714 ShouldNotReachHere(); 2715 return nullptr; 2716 JVM_END 2717 2718 2719 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2720 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2721 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2722 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2723 Symbol* classname = cp->klass_name_at(cp_index); 2724 return classname->as_utf8(); 2725 JVM_END 2726 2727 2728 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2729 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2730 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2731 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2732 switch (cp->tag_at(cp_index).value()) { 2733 case JVM_CONSTANT_Fieldref: { 2734 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2735 Symbol* classname = cp->klass_name_at(class_index); 2736 return classname->as_utf8(); 2737 } 2738 default: 2739 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2740 } 2741 ShouldNotReachHere(); 2742 return nullptr; 2743 JVM_END 2744 2745 2746 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2747 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2748 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2749 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2750 switch (cp->tag_at(cp_index).value()) { 2751 case JVM_CONSTANT_Methodref: 2752 case JVM_CONSTANT_InterfaceMethodref: { 2753 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2754 Symbol* classname = cp->klass_name_at(class_index); 2755 return classname->as_utf8(); 2756 } 2757 default: 2758 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2759 } 2760 ShouldNotReachHere(); 2761 return nullptr; 2762 JVM_END 2763 2764 2765 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2766 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2767 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2768 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2769 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2770 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2771 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2772 switch (cp->tag_at(cp_index).value()) { 2773 case JVM_CONSTANT_Fieldref: { 2774 Symbol* name = cp->uncached_name_ref_at(cp_index); 2775 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2776 InstanceKlass* ik = InstanceKlass::cast(k_called); 2777 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2778 if (fs.name() == name && fs.signature() == signature) { 2779 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2780 } 2781 } 2782 return -1; 2783 } 2784 default: 2785 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2786 } 2787 ShouldNotReachHere(); 2788 return 0; 2789 JVM_END 2790 2791 2792 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2793 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2794 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2795 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2796 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2797 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2798 switch (cp->tag_at(cp_index).value()) { 2799 case JVM_CONSTANT_Methodref: 2800 case JVM_CONSTANT_InterfaceMethodref: { 2801 Symbol* name = cp->uncached_name_ref_at(cp_index); 2802 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2803 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2804 int methods_count = methods->length(); 2805 for (int i = 0; i < methods_count; i++) { 2806 Method* method = methods->at(i); 2807 if (method->name() == name && method->signature() == signature) { 2808 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2809 } 2810 } 2811 return -1; 2812 } 2813 default: 2814 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2815 } 2816 ShouldNotReachHere(); 2817 return 0; 2818 JVM_END 2819 2820 2821 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2822 2823 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2824 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2825 JVM_END 2826 2827 2828 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2829 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2830 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2831 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2832 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2833 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2834 JVM_END 2835 2836 // Printing support ////////////////////////////////////////////////// 2837 extern "C" { 2838 2839 ATTRIBUTE_PRINTF(3, 0) 2840 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2841 // Reject count values that are negative signed values converted to 2842 // unsigned; see bug 4399518, 4417214 2843 if ((intptr_t)count <= 0) return -1; 2844 2845 int result = os::vsnprintf(str, count, fmt, args); 2846 if (result > 0 && (size_t)result >= count) { 2847 result = -1; 2848 } 2849 2850 return result; 2851 } 2852 2853 ATTRIBUTE_PRINTF(3, 4) 2854 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2855 va_list args; 2856 int len; 2857 va_start(args, fmt); 2858 len = jio_vsnprintf(str, count, fmt, args); 2859 va_end(args); 2860 return len; 2861 } 2862 2863 ATTRIBUTE_PRINTF(2, 3) 2864 int jio_fprintf(FILE* f, const char *fmt, ...) { 2865 int len; 2866 va_list args; 2867 va_start(args, fmt); 2868 len = jio_vfprintf(f, fmt, args); 2869 va_end(args); 2870 return len; 2871 } 2872 2873 ATTRIBUTE_PRINTF(2, 0) 2874 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2875 if (Arguments::vfprintf_hook() != nullptr) { 2876 return Arguments::vfprintf_hook()(f, fmt, args); 2877 } else { 2878 return vfprintf(f, fmt, args); 2879 } 2880 } 2881 2882 ATTRIBUTE_PRINTF(1, 2) 2883 JNIEXPORT int jio_printf(const char *fmt, ...) { 2884 int len; 2885 va_list args; 2886 va_start(args, fmt); 2887 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2888 va_end(args); 2889 return len; 2890 } 2891 2892 // HotSpot specific jio method 2893 void jio_print(const char* s, size_t len) { 2894 // Try to make this function as atomic as possible. 2895 if (Arguments::vfprintf_hook() != nullptr) { 2896 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2897 } else { 2898 // Make an unused local variable to avoid warning from gcc compiler. 2899 ssize_t count = os::write(defaultStream::output_fd(), s, (int)len); 2900 } 2901 } 2902 2903 } // Extern C 2904 2905 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2906 2907 // In most of the JVM thread support functions we need to access the 2908 // thread through a ThreadsListHandle to prevent it from exiting and 2909 // being reclaimed while we try to operate on it. The exceptions to this 2910 // rule are when operating on the current thread, or if the monitor of 2911 // the target java.lang.Thread is locked at the Java level - in both 2912 // cases the target cannot exit. 2913 2914 static void thread_entry(JavaThread* thread, TRAPS) { 2915 HandleMark hm(THREAD); 2916 Handle obj(THREAD, thread->threadObj()); 2917 JavaValue result(T_VOID); 2918 JavaCalls::call_virtual(&result, 2919 obj, 2920 vmClasses::Thread_klass(), 2921 vmSymbols::run_method_name(), 2922 vmSymbols::void_method_signature(), 2923 THREAD); 2924 } 2925 2926 2927 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2928 #if INCLUDE_CDS 2929 if (DumpSharedSpaces) { 2930 // During java -Xshare:dump, if we allow multiple Java threads to 2931 // execute in parallel, symbols and classes may be loaded in 2932 // random orders which will make the resulting CDS archive 2933 // non-deterministic. 2934 // 2935 // Lucikly, during java -Xshare:dump, it's important to run only 2936 // the code in the main Java thread (which is NOT started here) that 2937 // creates the module graph, etc. It's safe to not start the other 2938 // threads which are launched by class static initializers 2939 // (ReferenceHandler, FinalizerThread and CleanerImpl). 2940 if (log_is_enabled(Info, cds)) { 2941 ResourceMark rm; 2942 oop t = JNIHandles::resolve_non_null(jthread); 2943 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 2944 } 2945 return; 2946 } 2947 #endif 2948 JavaThread *native_thread = nullptr; 2949 2950 // We cannot hold the Threads_lock when we throw an exception, 2951 // due to rank ordering issues. Example: we might need to grab the 2952 // Heap_lock while we construct the exception. 2953 bool throw_illegal_thread_state = false; 2954 2955 // We must release the Threads_lock before we can post a jvmti event 2956 // in Thread::start. 2957 { 2958 // Ensure that the C++ Thread and OSThread structures aren't freed before 2959 // we operate. 2960 MutexLocker mu(Threads_lock); 2961 2962 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2963 // re-starting an already started thread, so we should usually find 2964 // that the JavaThread is null. However for a JNI attached thread 2965 // there is a small window between the Thread object being created 2966 // (with its JavaThread set) and the update to its threadStatus, so we 2967 // have to check for this 2968 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 2969 throw_illegal_thread_state = true; 2970 } else { 2971 jlong size = 2972 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2973 // Allocate the C++ Thread structure and create the native thread. The 2974 // stack size retrieved from java is 64-bit signed, but the constructor takes 2975 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2976 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2977 // - Avoid passing negative values which would result in really large stacks. 2978 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2979 size_t sz = size > 0 ? (size_t) size : 0; 2980 native_thread = new JavaThread(&thread_entry, sz); 2981 2982 // At this point it may be possible that no osthread was created for the 2983 // JavaThread due to lack of memory. Check for this situation and throw 2984 // an exception if necessary. Eventually we may want to change this so 2985 // that we only grab the lock if the thread was created successfully - 2986 // then we can also do this check and throw the exception in the 2987 // JavaThread constructor. 2988 if (native_thread->osthread() != nullptr) { 2989 // Note: the current thread is not being used within "prepare". 2990 native_thread->prepare(jthread); 2991 } 2992 } 2993 } 2994 2995 if (throw_illegal_thread_state) { 2996 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2997 } 2998 2999 assert(native_thread != nullptr, "Starting null thread?"); 3000 3001 if (native_thread->osthread() == nullptr) { 3002 ResourceMark rm(thread); 3003 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 3004 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 3005 // No one should hold a reference to the 'native_thread'. 3006 native_thread->smr_delete(); 3007 if (JvmtiExport::should_post_resource_exhausted()) { 3008 JvmtiExport::post_resource_exhausted( 3009 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3010 os::native_thread_creation_failed_msg()); 3011 } 3012 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3013 os::native_thread_creation_failed_msg()); 3014 } 3015 3016 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3017 3018 Thread::start(native_thread); 3019 3020 JVM_END 3021 3022 3023 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3024 ThreadsListHandle tlh(thread); 3025 oop java_thread = nullptr; 3026 JavaThread* receiver = nullptr; 3027 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3028 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3029 3030 if (is_alive) { 3031 // jthread refers to a live JavaThread. 3032 Thread::set_priority(receiver, (ThreadPriority)prio); 3033 } 3034 // Implied else: If the JavaThread hasn't started yet, then the 3035 // priority set in the java.lang.Thread object above will be pushed 3036 // down when it does start. 3037 JVM_END 3038 3039 3040 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3041 if (os::dont_yield()) return; 3042 HOTSPOT_THREAD_YIELD(); 3043 os::naked_yield(); 3044 JVM_END 3045 3046 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3047 if (millis < 0) { 3048 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3049 } 3050 3051 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3052 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3053 } 3054 3055 // Save current thread state and restore it at the end of this block. 3056 // And set new thread state to SLEEPING. 3057 JavaThreadSleepState jtss(thread); 3058 3059 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3060 3061 if (millis == 0) { 3062 os::naked_yield(); 3063 } else { 3064 ThreadState old_state = thread->osthread()->get_state(); 3065 thread->osthread()->set_state(SLEEPING); 3066 if (!thread->sleep(millis)) { // interrupted 3067 // An asynchronous exception could have been thrown on 3068 // us while we were sleeping. We do not overwrite those. 3069 if (!HAS_PENDING_EXCEPTION) { 3070 HOTSPOT_THREAD_SLEEP_END(1); 3071 3072 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3073 // to properly restore the thread state. That's likely wrong. 3074 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3075 } 3076 } 3077 thread->osthread()->set_state(old_state); 3078 } 3079 HOTSPOT_THREAD_SLEEP_END(0); 3080 JVM_END 3081 3082 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3083 oop jthread = thread->threadObj(); 3084 assert(jthread != nullptr, "no current carrier thread!"); 3085 return JNIHandles::make_local(THREAD, jthread); 3086 JVM_END 3087 3088 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3089 oop theThread = thread->vthread(); 3090 assert(theThread != (oop)nullptr, "no current thread!"); 3091 return JNIHandles::make_local(THREAD, theThread); 3092 JVM_END 3093 3094 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3095 jobject theThread)) 3096 oop threadObj = JNIHandles::resolve(theThread); 3097 thread->set_vthread(threadObj); 3098 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3099 JVM_END 3100 3101 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3102 return ThreadIdentifier::unsafe_offset(); 3103 JVM_END 3104 3105 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3106 ThreadsListHandle tlh(thread); 3107 JavaThread* receiver = nullptr; 3108 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3109 if (is_alive) { 3110 // jthread refers to a live JavaThread. 3111 receiver->interrupt(); 3112 } 3113 JVM_END 3114 3115 // Return true iff the current thread has locked the object passed in 3116 3117 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3118 if (obj == nullptr) { 3119 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3120 } 3121 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3122 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3123 JVM_END 3124 3125 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3126 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD); 3127 return JNIHandles::make_local(THREAD, trace); 3128 JVM_END 3129 3130 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3131 VM_PrintThreads op; 3132 VMThread::execute(&op); 3133 if (JvmtiExport::should_post_data_dump()) { 3134 JvmtiExport::post_data_dump(); 3135 } 3136 JVM_END 3137 3138 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3139 // We don't use a ThreadsListHandle here because the current thread 3140 // must be alive. 3141 oop java_thread = JNIHandles::resolve_non_null(jthread); 3142 JavaThread* thr = java_lang_Thread::thread(java_thread); 3143 if (thread == thr && !thr->has_attached_via_jni()) { 3144 // Thread naming is only supported for the current thread and 3145 // we don't set the name of an attached thread to avoid stepping 3146 // on other programs. 3147 ResourceMark rm(thread); 3148 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3149 os::set_native_thread_name(thread_name); 3150 } 3151 JVM_END 3152 3153 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3154 oop theCache = thread->scopedValueCache(); 3155 return JNIHandles::make_local(THREAD, theCache); 3156 JVM_END 3157 3158 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3159 jobject theCache)) 3160 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3161 thread->set_scopedValueCache(objs); 3162 JVM_END 3163 3164 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3165 3166 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3167 ResourceMark rm(THREAD); 3168 JvmtiVMObjectAllocEventCollector oam; 3169 vframeStream vfst(thread); 3170 3171 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) { 3172 // This must only be called from SecurityManager.getClassContext 3173 Method* m = vfst.method(); 3174 if (!(m->method_holder() == vmClasses::SecurityManager_klass() && 3175 m->name() == vmSymbols::getClassContext_name() && 3176 m->signature() == vmSymbols::void_class_array_signature())) { 3177 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3178 } 3179 } 3180 3181 // Collect method holders 3182 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3183 for (; !vfst.at_end(); vfst.security_next()) { 3184 Method* m = vfst.method(); 3185 // Native frames are not returned 3186 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3187 Klass* holder = m->method_holder(); 3188 assert(holder->is_klass(), "just checking"); 3189 klass_array->append(holder); 3190 } 3191 } 3192 3193 // Create result array of type [Ljava/lang/Class; 3194 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL); 3195 // Fill in mirrors corresponding to method holders 3196 for (int i = 0; i < klass_array->length(); i++) { 3197 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3198 } 3199 3200 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3201 JVM_END 3202 3203 3204 // java.lang.Package //////////////////////////////////////////////////////////////// 3205 3206 3207 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3208 ResourceMark rm(THREAD); 3209 JvmtiVMObjectAllocEventCollector oam; 3210 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3211 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3212 return (jstring) JNIHandles::make_local(THREAD, result); 3213 JVM_END 3214 3215 3216 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3217 JvmtiVMObjectAllocEventCollector oam; 3218 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3219 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3220 JVM_END 3221 3222 3223 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3224 3225 3226 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3227 MonitorLocker ml(Heap_lock); 3228 oop ref = Universe::reference_pending_list(); 3229 if (ref != nullptr) { 3230 Universe::clear_reference_pending_list(); 3231 } 3232 return JNIHandles::make_local(THREAD, ref); 3233 JVM_END 3234 3235 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3236 MonitorLocker ml(Heap_lock); 3237 return Universe::has_reference_pending_list(); 3238 JVM_END 3239 3240 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3241 MonitorLocker ml(Heap_lock); 3242 while (!Universe::has_reference_pending_list()) { 3243 ml.wait(); 3244 } 3245 JVM_END 3246 3247 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3248 oop ref_oop = JNIHandles::resolve_non_null(ref); 3249 // PhantomReference has it's own implementation of refersTo(). 3250 // See: JVM_PhantomReferenceRefersTo 3251 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3252 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3253 return referent == JNIHandles::resolve(o); 3254 JVM_END 3255 3256 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3257 oop ref_oop = JNIHandles::resolve_non_null(ref); 3258 // FinalReference has it's own implementation of clear(). 3259 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3260 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3261 // If the referent has already been cleared then done. 3262 // However, if the referent is dead but has not yet been cleared by 3263 // concurrent reference processing, it should NOT be cleared here. 3264 // Instead, clearing should be left to the GC. Clearing it here could 3265 // detectably lose an expected notification, which is impossible with 3266 // STW reference processing. The clearing in enqueue() doesn't have 3267 // this problem, since the enqueue covers the notification, but it's not 3268 // worth the effort to handle that case specially. 3269 return; 3270 } 3271 java_lang_ref_Reference::clear_referent(ref_oop); 3272 JVM_END 3273 3274 3275 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3276 3277 3278 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3279 oop ref_oop = JNIHandles::resolve_non_null(ref); 3280 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3281 return referent == JNIHandles::resolve(o); 3282 JVM_END 3283 3284 3285 // ObjectInputStream /////////////////////////////////////////////////////////////// 3286 3287 // Return the first user-defined class loader up the execution stack, or null 3288 // if only code from the bootstrap or platform class loader is on the stack. 3289 3290 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3291 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3292 InstanceKlass* ik = vfst.method()->method_holder(); 3293 oop loader = ik->class_loader(); 3294 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3295 // Skip reflection related frames 3296 if (!ik->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass()) && 3297 !ik->is_subclass_of(vmClasses::reflect_ConstructorAccessorImpl_klass())) { 3298 return JNIHandles::make_local(THREAD, loader); 3299 } 3300 } 3301 } 3302 return nullptr; 3303 JVM_END 3304 3305 3306 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3307 3308 3309 // resolve array handle and check arguments 3310 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3311 if (arr == nullptr) { 3312 THROW_0(vmSymbols::java_lang_NullPointerException()); 3313 } 3314 oop a = JNIHandles::resolve_non_null(arr); 3315 if (!a->is_array()) { 3316 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3317 } else if (type_array_only && !a->is_typeArray()) { 3318 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3319 } 3320 return arrayOop(a); 3321 } 3322 3323 3324 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3325 arrayOop a = check_array(env, arr, false, CHECK_0); 3326 return a->length(); 3327 JVM_END 3328 3329 3330 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3331 JvmtiVMObjectAllocEventCollector oam; 3332 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3333 jvalue value; 3334 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3335 oop box = Reflection::box(&value, type, CHECK_NULL); 3336 return JNIHandles::make_local(THREAD, box); 3337 JVM_END 3338 3339 3340 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3341 jvalue value; 3342 value.i = 0; // to initialize value before getting used in CHECK 3343 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3344 assert(a->is_typeArray(), "just checking"); 3345 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3346 BasicType wide_type = (BasicType) wCode; 3347 if (type != wide_type) { 3348 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3349 } 3350 return value; 3351 JVM_END 3352 3353 3354 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3355 arrayOop a = check_array(env, arr, false, CHECK); 3356 oop box = JNIHandles::resolve(val); 3357 jvalue value; 3358 value.i = 0; // to initialize value before getting used in CHECK 3359 BasicType value_type; 3360 if (a->is_objArray()) { 3361 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3362 value_type = Reflection::unbox_for_regular_object(box, &value); 3363 } else { 3364 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3365 } 3366 Reflection::array_set(&value, a, index, value_type, CHECK); 3367 JVM_END 3368 3369 3370 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3371 arrayOop a = check_array(env, arr, true, CHECK); 3372 assert(a->is_typeArray(), "just checking"); 3373 BasicType value_type = (BasicType) vCode; 3374 Reflection::array_set(&v, a, index, value_type, CHECK); 3375 JVM_END 3376 3377 3378 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3379 JvmtiVMObjectAllocEventCollector oam; 3380 oop element_mirror = JNIHandles::resolve(eltClass); 3381 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3382 return JNIHandles::make_local(THREAD, result); 3383 JVM_END 3384 3385 3386 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3387 JvmtiVMObjectAllocEventCollector oam; 3388 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3389 oop element_mirror = JNIHandles::resolve(eltClass); 3390 assert(dim_array->is_typeArray(), "just checking"); 3391 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3392 return JNIHandles::make_local(THREAD, result); 3393 JVM_END 3394 3395 3396 // Library support /////////////////////////////////////////////////////////////////////////// 3397 3398 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3399 ClassLoader::load_zip_library_if_needed(); 3400 return ClassLoader::zip_library_handle(); 3401 JVM_END 3402 3403 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3404 //%note jvm_ct 3405 char ebuf[1024]; 3406 void *load_result; 3407 { 3408 ThreadToNativeFromVM ttnfvm(thread); 3409 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3410 } 3411 if (load_result == nullptr) { 3412 if (throwException) { 3413 char msg[1024]; 3414 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3415 // Since 'ebuf' may contain a string encoded using 3416 // platform encoding scheme, we need to pass 3417 // Exceptions::unsafe_to_utf8 to the new_exception method 3418 // as the last argument. See bug 6367357. 3419 Handle h_exception = 3420 Exceptions::new_exception(thread, 3421 vmSymbols::java_lang_UnsatisfiedLinkError(), 3422 msg, Exceptions::unsafe_to_utf8); 3423 3424 THROW_HANDLE_0(h_exception); 3425 } else { 3426 log_info(library)("Failed to load library %s", name); 3427 return load_result; 3428 } 3429 } 3430 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3431 return load_result; 3432 JVM_END 3433 3434 3435 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3436 os::dll_unload(handle); 3437 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3438 JVM_END 3439 3440 3441 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3442 void* find_result = os::dll_lookup(handle, name); 3443 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3444 find_result != nullptr ? "Found" : "Failed to find", 3445 name, p2i(handle)); 3446 return find_result; 3447 JVM_END 3448 3449 3450 // JNI version /////////////////////////////////////////////////////////////////////////////// 3451 3452 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3453 return Threads::is_supported_jni_version_including_1_1(version); 3454 JVM_END 3455 3456 3457 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3458 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3459 JVM_END 3460 3461 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3462 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3463 JVM_END 3464 3465 // String support /////////////////////////////////////////////////////////////////////////// 3466 3467 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3468 JvmtiVMObjectAllocEventCollector oam; 3469 if (str == nullptr) return nullptr; 3470 oop string = JNIHandles::resolve_non_null(str); 3471 oop result = StringTable::intern(string, CHECK_NULL); 3472 return (jstring) JNIHandles::make_local(THREAD, result); 3473 JVM_END 3474 3475 3476 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3477 3478 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3479 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3480 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3481 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3482 // nature. JavaThreads will be "in native" when using this API from JDK code. 3483 3484 3485 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3486 VM_Exit::block_if_vm_exited(); 3487 return new PlatformMutex(); 3488 } 3489 3490 3491 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3492 VM_Exit::block_if_vm_exited(); 3493 delete ((PlatformMutex*) mon); 3494 } 3495 3496 3497 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3498 VM_Exit::block_if_vm_exited(); 3499 ((PlatformMutex*) mon)->lock(); 3500 return 0; 3501 } 3502 3503 3504 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3505 VM_Exit::block_if_vm_exited(); 3506 ((PlatformMutex*) mon)->unlock(); 3507 } 3508 3509 3510 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3511 3512 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3513 Handle loader, Handle protection_domain, 3514 jboolean throwError, TRAPS) { 3515 // Security Note: 3516 // The Java level wrapper will perform the necessary security check allowing 3517 // us to pass the null as the initiating class loader. The VM is responsible for 3518 // the checkPackageAccess relative to the initiating class loader via the 3519 // protection_domain. The protection_domain is passed as null by the java code 3520 // if there is no security manager in 3-arg Class.forName(). 3521 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3522 3523 // Check if we should initialize the class 3524 if (init && klass->is_instance_klass()) { 3525 klass->initialize(CHECK_NULL); 3526 } 3527 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3528 } 3529 3530 3531 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3532 3533 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3534 Handle method_handle; 3535 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3536 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3537 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3538 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3539 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3540 jobject res = JNIHandles::make_local(THREAD, result); 3541 if (JvmtiExport::should_post_vm_object_alloc()) { 3542 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3543 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3544 if (java_lang_Class::is_primitive(ret_type)) { 3545 // Only for primitive type vm allocates memory for java object. 3546 // See box() method. 3547 JvmtiExport::post_vm_object_alloc(thread, result); 3548 } 3549 } 3550 return res; 3551 } else { 3552 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3553 } 3554 JVM_END 3555 3556 3557 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3558 oop constructor_mirror = JNIHandles::resolve(c); 3559 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3560 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3561 jobject res = JNIHandles::make_local(THREAD, result); 3562 if (JvmtiExport::should_post_vm_object_alloc()) { 3563 JvmtiExport::post_vm_object_alloc(thread, result); 3564 } 3565 return res; 3566 JVM_END 3567 3568 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3569 3570 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3571 return VM_Version::supports_cx8(); 3572 JVM_END 3573 3574 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3575 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3576 assert(k->is_klass(), "just checking"); 3577 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3578 JVM_END 3579 3580 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3581 jclass caller, 3582 jstring interfaceMethodName, 3583 jobject factoryType, 3584 jobject interfaceMethodType, 3585 jobject implementationMember, 3586 jobject dynamicMethodType, 3587 jclass lambdaProxyClass)) 3588 #if INCLUDE_CDS 3589 if (!Arguments::is_dumping_archive()) { 3590 return; 3591 } 3592 3593 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3594 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3595 if (caller_ik->is_hidden()) { 3596 // Hidden classes not of type lambda proxy classes are currently not being archived. 3597 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3598 // registered for archiving. 3599 return; 3600 } 3601 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass)); 3602 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k); 3603 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3604 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3605 3606 Symbol* interface_method_name = nullptr; 3607 if (interfaceMethodName != nullptr) { 3608 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3609 } 3610 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3611 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3612 3613 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3614 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3615 3616 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3617 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3618 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3619 3620 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3621 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3622 3623 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3624 interface_method_type, m, dynamic_method_type, THREAD); 3625 #endif // INCLUDE_CDS 3626 JVM_END 3627 3628 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3629 jclass caller, 3630 jstring interfaceMethodName, 3631 jobject factoryType, 3632 jobject interfaceMethodType, 3633 jobject implementationMember, 3634 jobject dynamicMethodType)) 3635 #if INCLUDE_CDS 3636 3637 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3638 implementationMember == nullptr || dynamicMethodType == nullptr) { 3639 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3640 } 3641 3642 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3643 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3644 if (!caller_ik->is_shared()) { 3645 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3646 return nullptr; 3647 } 3648 3649 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3650 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3651 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3652 3653 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3654 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3655 3656 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3657 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3658 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3659 3660 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3661 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3662 3663 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3664 interface_method_type, m, dynamic_method_type); 3665 jclass jcls = nullptr; 3666 if (lambda_ik != nullptr) { 3667 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD); 3668 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3669 } 3670 return jcls; 3671 #else 3672 return nullptr; 3673 #endif // INCLUDE_CDS 3674 JVM_END 3675 3676 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env)) 3677 return Arguments::is_dumping_archive(); 3678 JVM_END 3679 3680 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env)) 3681 return UseSharedSpaces; 3682 JVM_END 3683 3684 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3685 if (DumpSharedSpaces) { 3686 const char* release = VM_Version::vm_release(); 3687 const char* dbg_level = VM_Version::jdk_debug_level(); 3688 const char* version = VM_Version::internal_vm_info_string(); 3689 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3690 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3691 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3692 seed += (jlong)VM_Version::vm_major_version(); 3693 seed += (jlong)VM_Version::vm_minor_version(); 3694 seed += (jlong)VM_Version::vm_security_version(); 3695 seed += (jlong)VM_Version::vm_patch_version(); 3696 if (seed == 0) { // don't let this ever be zero. 3697 seed = 0x87654321; 3698 } 3699 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3700 return seed; 3701 } else { 3702 return 0; 3703 } 3704 JVM_END 3705 3706 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env)) 3707 #if INCLUDE_CDS 3708 return ClassListWriter::is_enabled() || DynamicDumpSharedSpaces; 3709 #else 3710 return false; 3711 #endif // INCLUDE_CDS 3712 JVM_END 3713 3714 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3715 #if INCLUDE_CDS 3716 assert(ClassListWriter::is_enabled() || DynamicDumpSharedSpaces, "Should be set and open or do dynamic dump"); 3717 if (line != nullptr) { 3718 ResourceMark rm(THREAD); 3719 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3720 char* c_line = java_lang_String::as_utf8_string(h_line()); 3721 if (DynamicDumpSharedSpaces) { 3722 // Note: LambdaFormInvokers::append take same format which is not 3723 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3724 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3725 } 3726 if (ClassListWriter::is_enabled()) { 3727 ClassListWriter w; 3728 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line); 3729 } 3730 } 3731 #endif // INCLUDE_CDS 3732 JVM_END 3733 3734 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3735 #if INCLUDE_CDS 3736 ResourceMark rm(THREAD); 3737 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3738 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3739 MetaspaceShared::dump_loaded_classes(file_name, THREAD); 3740 #endif // INCLUDE_CDS 3741 JVM_END 3742 3743 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3744 #if INCLUDE_CDS 3745 ResourceMark rm(THREAD); 3746 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3747 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3748 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3749 #endif // INCLUDE_CDS 3750 JVM_END 3751 3752 // Returns an array of all live Thread objects (VM internal JavaThreads, 3753 // jvmti agent threads, and JNI attaching threads are skipped) 3754 // See CR 6404306 regarding JNI attaching threads 3755 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3756 ResourceMark rm(THREAD); 3757 ThreadsListEnumerator tle(THREAD, false, false); 3758 JvmtiVMObjectAllocEventCollector oam; 3759 3760 int num_threads = tle.num_threads(); 3761 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3762 objArrayHandle threads_ah(THREAD, r); 3763 3764 for (int i = 0; i < num_threads; i++) { 3765 Handle h = tle.get_threadObj(i); 3766 threads_ah->obj_at_put(i, h()); 3767 } 3768 3769 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3770 JVM_END 3771 3772 3773 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3774 // Return StackTraceElement[][], each element is the stack trace of a thread in 3775 // the corresponding entry in the given threads array 3776 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3777 JvmtiVMObjectAllocEventCollector oam; 3778 3779 // Check if threads is null 3780 if (threads == nullptr) { 3781 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3782 } 3783 3784 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3785 objArrayHandle ah(THREAD, a); 3786 int num_threads = ah->length(); 3787 // check if threads is non-empty array 3788 if (num_threads == 0) { 3789 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3790 } 3791 3792 // check if threads is not an array of objects of Thread class 3793 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3794 if (k != vmClasses::Thread_klass()) { 3795 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3796 } 3797 3798 ResourceMark rm(THREAD); 3799 3800 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3801 for (int i = 0; i < num_threads; i++) { 3802 oop thread_obj = ah->obj_at(i); 3803 instanceHandle h(THREAD, (instanceOop) thread_obj); 3804 thread_handle_array->append(h); 3805 } 3806 3807 // The JavaThread references in thread_handle_array are validated 3808 // in VM_ThreadDump::doit(). 3809 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3810 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3811 3812 JVM_END 3813 3814 // JVM monitoring and management support 3815 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3816 return Management::get_jmm_interface(version); 3817 JVM_END 3818 3819 // com.sun.tools.attach.VirtualMachine agent properties support 3820 // 3821 // Initialize the agent properties with the properties maintained in the VM 3822 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3823 ResourceMark rm; 3824 3825 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3826 3827 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3828 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3829 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3830 return properties; 3831 JVM_END 3832 3833 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3834 { 3835 JvmtiVMObjectAllocEventCollector oam; 3836 3837 if (ofClass == nullptr) { 3838 return nullptr; 3839 } 3840 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3841 // Special handling for primitive objects 3842 if (java_lang_Class::is_primitive(mirror())) { 3843 return nullptr; 3844 } 3845 Klass* k = java_lang_Class::as_Klass(mirror()); 3846 if (!k->is_instance_klass()) { 3847 return nullptr; 3848 } 3849 InstanceKlass* ik = InstanceKlass::cast(k); 3850 int encl_method_class_idx = ik->enclosing_method_class_index(); 3851 if (encl_method_class_idx == 0) { 3852 return nullptr; 3853 } 3854 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3855 objArrayHandle dest(THREAD, dest_o); 3856 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3857 dest->obj_at_put(0, enc_k->java_mirror()); 3858 int encl_method_method_idx = ik->enclosing_method_method_index(); 3859 if (encl_method_method_idx != 0) { 3860 Symbol* sym = ik->constants()->symbol_at( 3861 extract_low_short_from_int( 3862 ik->constants()->name_and_type_at(encl_method_method_idx))); 3863 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3864 dest->obj_at_put(1, str()); 3865 sym = ik->constants()->symbol_at( 3866 extract_high_short_from_int( 3867 ik->constants()->name_and_type_at(encl_method_method_idx))); 3868 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3869 dest->obj_at_put(2, str()); 3870 } 3871 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3872 } 3873 JVM_END 3874 3875 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3876 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3877 ResourceMark rm(THREAD); 3878 3879 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3880 return nullptr; 3881 } 3882 3883 char** vm_flags = Arguments::jvm_flags_array(); 3884 char** vm_args = Arguments::jvm_args_array(); 3885 int num_flags = Arguments::num_jvm_flags(); 3886 int num_args = Arguments::num_jvm_args(); 3887 3888 InstanceKlass* ik = vmClasses::String_klass(); 3889 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3890 objArrayHandle result_h(THREAD, r); 3891 3892 int index = 0; 3893 for (int j = 0; j < num_flags; j++, index++) { 3894 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3895 result_h->obj_at_put(index, h()); 3896 } 3897 for (int i = 0; i < num_args; i++, index++) { 3898 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3899 result_h->obj_at_put(index, h()); 3900 } 3901 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 3902 JVM_END 3903 3904 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 3905 return os::get_signal_number(name); 3906 JVM_END 3907 3908 // If notifications are disabled then just update the VTMS transition bit and return. 3909 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call. 3910 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide, jboolean first_mount)) 3911 #if INCLUDE_JVMTI 3912 if (!DoJVMTIVirtualThreadTransitions) { 3913 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3914 return; 3915 } 3916 if (!JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3917 thread->set_is_in_VTMS_transition(hide); 3918 oop vt = JNIHandles::resolve_external_guard(vthread); 3919 java_lang_Thread::set_is_in_VTMS_transition(vt, hide); 3920 return; 3921 } 3922 if (hide) { 3923 JvmtiVTMSTransitionDisabler::VTMS_mount_begin(vthread, first_mount); 3924 } else { 3925 JvmtiVTMSTransitionDisabler::VTMS_mount_end(vthread, first_mount); 3926 } 3927 #else 3928 fatal("Should only be called with JVMTI enabled"); 3929 #endif 3930 JVM_END 3931 3932 // If notifications are disabled then just update the VTMS transition bit and return. 3933 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below. 3934 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide, jboolean last_unmount)) 3935 #if INCLUDE_JVMTI 3936 if (!DoJVMTIVirtualThreadTransitions) { 3937 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3938 return; 3939 } 3940 if (!JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3941 thread->set_is_in_VTMS_transition(hide); 3942 oop vt = JNIHandles::resolve_external_guard(vthread); 3943 java_lang_Thread::set_is_in_VTMS_transition(vt, hide); 3944 return; 3945 } 3946 if (hide) { 3947 JvmtiVTMSTransitionDisabler::VTMS_unmount_begin(vthread, last_unmount); 3948 } else { 3949 JvmtiVTMSTransitionDisabler::VTMS_unmount_end(vthread, last_unmount); 3950 } 3951 #else 3952 fatal("Should only be called with JVMTI enabled"); 3953 #endif 3954 JVM_END 3955 3956 // Always update the temporary VTMS transition bit. 3957 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jobject vthread, jboolean hide)) 3958 #if INCLUDE_JVMTI 3959 if (!DoJVMTIVirtualThreadTransitions) { 3960 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3961 return; 3962 } 3963 assert(!thread->is_in_VTMS_transition(), "sanity check"); 3964 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check"); 3965 thread->toggle_is_in_tmp_VTMS_transition(); 3966 #else 3967 fatal("Should only be called with JVMTI enabled"); 3968 #endif 3969 JVM_END 3970 3971 /* 3972 * Return the current class's class file version. The low order 16 bits of the 3973 * returned jint contain the class's major version. The high order 16 bits 3974 * contain the class's minor version. 3975 */ 3976 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 3977 oop mirror = JNIHandles::resolve_non_null(current); 3978 if (java_lang_Class::is_primitive(mirror)) { 3979 // return latest major version and minor version of 0. 3980 return JVM_CLASSFILE_MAJOR_VERSION; 3981 } 3982 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class"); 3983 3984 Klass* c = java_lang_Class::as_Klass(mirror); 3985 assert(c->is_instance_klass(), "must be"); 3986 InstanceKlass* ik = InstanceKlass::cast(c); 3987 return (ik->minor_version() << 16) | ik->major_version(); 3988 JVM_END 3989 3990 /* 3991 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 3992 * get the value will see a materialized value and not a scalar-replaced 3993 * null value. 3994 */ 3995 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 3996 JVM_EnsureMaterializedForStackWalk(env, value); 3997 JVM_END