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/cdsConfig.hpp" 27 #include "cds/classListParser.hpp" 28 #include "cds/classListWriter.hpp" 29 #include "cds/dynamicArchive.hpp" 30 #include "cds/heapShared.hpp" 31 #include "cds/lambdaFormInvokers.hpp" 32 #include "classfile/classFileStream.hpp" 33 #include "classfile/classLoader.inline.hpp" 34 #include "classfile/classLoaderData.hpp" 35 #include "classfile/classLoaderData.inline.hpp" 36 #include "classfile/classLoadInfo.hpp" 37 #include "classfile/javaAssertions.hpp" 38 #include "classfile/javaClasses.inline.hpp" 39 #include "classfile/moduleEntry.hpp" 40 #include "classfile/modules.hpp" 41 #include "classfile/packageEntry.hpp" 42 #include "classfile/stringTable.hpp" 43 #include "classfile/symbolTable.hpp" 44 #include "classfile/systemDictionary.hpp" 45 #include "classfile/vmClasses.hpp" 46 #include "classfile/vmSymbols.hpp" 47 #include "gc/shared/collectedHeap.inline.hpp" 48 #include "interpreter/bytecode.hpp" 49 #include "interpreter/bytecodeUtils.hpp" 50 #include "jfr/jfrEvents.hpp" 51 #include "jvm.h" 52 #include "logging/log.hpp" 53 #include "memory/oopFactory.hpp" 54 #include "memory/referenceType.hpp" 55 #include "memory/resourceArea.hpp" 56 #include "memory/universe.hpp" 57 #include "oops/access.inline.hpp" 58 #include "oops/constantPool.hpp" 59 #include "oops/fieldStreams.inline.hpp" 60 #include "oops/instanceKlass.hpp" 61 #include "oops/klass.inline.hpp" 62 #include "oops/method.hpp" 63 #include "oops/recordComponent.hpp" 64 #include "oops/objArrayKlass.hpp" 65 #include "oops/objArrayOop.inline.hpp" 66 #include "oops/oop.inline.hpp" 67 #include "prims/foreignGlobals.hpp" 68 #include "prims/jvm_misc.hpp" 69 #include "prims/jvmtiExport.hpp" 70 #include "prims/jvmtiThreadState.inline.hpp" 71 #include "prims/stackwalk.hpp" 72 #include "runtime/arguments.hpp" 73 #include "runtime/atomic.hpp" 74 #include "runtime/continuation.hpp" 75 #include "runtime/globals_extension.hpp" 76 #include "runtime/handles.inline.hpp" 77 #include "runtime/init.hpp" 78 #include "runtime/interfaceSupport.inline.hpp" 79 #include "runtime/deoptimization.hpp" 80 #include "runtime/handshake.hpp" 81 #include "runtime/java.hpp" 82 #include "runtime/javaCalls.hpp" 83 #include "runtime/javaThread.hpp" 84 #include "runtime/jfieldIDWorkaround.hpp" 85 #include "runtime/jniHandles.inline.hpp" 86 #include "runtime/os.inline.hpp" 87 #include "runtime/osThread.hpp" 88 #include "runtime/perfData.hpp" 89 #include "runtime/reflection.hpp" 90 #include "runtime/synchronizer.hpp" 91 #include "runtime/threadIdentifier.hpp" 92 #include "runtime/threadSMR.hpp" 93 #include "runtime/vframe.inline.hpp" 94 #include "runtime/vmOperations.hpp" 95 #include "runtime/vm_version.hpp" 96 #include "services/attachListener.hpp" 97 #include "services/management.hpp" 98 #include "services/threadService.hpp" 99 #include "utilities/checkedCast.hpp" 100 #include "utilities/copy.hpp" 101 #include "utilities/defaultStream.hpp" 102 #include "utilities/dtrace.hpp" 103 #include "utilities/events.hpp" 104 #include "utilities/macros.hpp" 105 #include "utilities/utf8.hpp" 106 #include "utilities/zipLibrary.hpp" 107 #if INCLUDE_CDS 108 #include "classfile/systemDictionaryShared.hpp" 109 #endif 110 #if INCLUDE_JFR 111 #include "jfr/jfr.hpp" 112 #endif 113 #if INCLUDE_MANAGEMENT 114 #include "services/finalizerService.hpp" 115 #endif 116 117 #include <errno.h> 118 119 /* 120 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 121 such ctors and calls MUST NOT come between an oop declaration/init and its 122 usage because if objects are move this may cause various memory stomps, bus 123 errors and segfaults. Here is a cookbook for causing so called "naked oop 124 failures": 125 126 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 127 // Object address to be held directly in mirror & not visible to GC 128 oop mirror = JNIHandles::resolve_non_null(ofClass); 129 130 // If this ctor can hit a safepoint, moving objects around, then 131 ComplexConstructor foo; 132 133 // Boom! mirror may point to JUNK instead of the intended object 134 (some dereference of mirror) 135 136 // Here's another call that may block for GC, making mirror stale 137 MutexLocker ml(some_lock); 138 139 // And here's an initializer that can result in a stale oop 140 // all in one step. 141 oop o = call_that_can_throw_exception(TRAPS); 142 143 144 The solution is to keep the oop declaration BELOW the ctor or function 145 call that might cause a GC, do another resolve to reassign the oop, or 146 consider use of a Handle instead of an oop so there is immunity from object 147 motion. But note that the "QUICK" entries below do not have a handlemark 148 and thus can only support use of handles passed in. 149 */ 150 151 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 152 ResourceMark rm; 153 int line_number = -1; 154 const char * source_file = nullptr; 155 const char * trace = "explicit"; 156 InstanceKlass* caller = nullptr; 157 JavaThread* jthread = THREAD; 158 if (jthread->has_last_Java_frame()) { 159 vframeStream vfst(jthread); 160 161 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 162 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController"); 163 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 164 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction"); 165 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 166 167 Method* last_caller = nullptr; 168 169 while (!vfst.at_end()) { 170 Method* m = vfst.method(); 171 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&& 172 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 173 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 174 break; 175 } 176 last_caller = m; 177 vfst.next(); 178 } 179 // if this is called from Class.forName0 and that is called from Class.forName, 180 // then print the caller of Class.forName. If this is Class.loadClass, then print 181 // that caller, otherwise keep quiet since this should be picked up elsewhere. 182 bool found_it = false; 183 if (!vfst.at_end() && 184 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 185 vfst.method()->name() == vmSymbols::forName0_name()) { 186 vfst.next(); 187 if (!vfst.at_end() && 188 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 189 vfst.method()->name() == vmSymbols::forName_name()) { 190 vfst.next(); 191 found_it = true; 192 } 193 } else if (last_caller != nullptr && 194 last_caller->method_holder()->name() == 195 vmSymbols::java_lang_ClassLoader() && 196 last_caller->name() == vmSymbols::loadClass_name()) { 197 found_it = true; 198 } else if (!vfst.at_end()) { 199 if (vfst.method()->is_native()) { 200 // JNI call 201 found_it = true; 202 } 203 } 204 if (found_it && !vfst.at_end()) { 205 // found the caller 206 caller = vfst.method()->method_holder(); 207 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 208 if (line_number == -1) { 209 // show method name if it's a native method 210 trace = vfst.method()->name_and_sig_as_C_string(); 211 } 212 Symbol* s = caller->source_file_name(); 213 if (s != nullptr) { 214 source_file = s->as_C_string(); 215 } 216 } 217 } 218 if (caller != nullptr) { 219 if (to_class != caller) { 220 const char * from = caller->external_name(); 221 const char * to = to_class->external_name(); 222 // print in a single call to reduce interleaving between threads 223 if (source_file != nullptr) { 224 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 225 } else { 226 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 227 } 228 } 229 } 230 } 231 232 void trace_class_resolution(Klass* to_class) { 233 EXCEPTION_MARK; 234 trace_class_resolution_impl(to_class, THREAD); 235 if (HAS_PENDING_EXCEPTION) { 236 CLEAR_PENDING_EXCEPTION; 237 } 238 } 239 240 // java.lang.System ////////////////////////////////////////////////////////////////////// 241 242 243 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 244 return os::javaTimeMillis(); 245 JVM_END 246 247 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 248 return os::javaTimeNanos(); 249 JVM_END 250 251 // The function below is actually exposed by jdk.internal.misc.VM and not 252 // java.lang.System, but we choose to keep it here so that it stays next 253 // to JVM_CurrentTimeMillis and JVM_NanoTime 254 255 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 256 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 257 258 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 259 jlong seconds; 260 jlong nanos; 261 262 os::javaTimeSystemUTC(seconds, nanos); 263 264 // We're going to verify that the result can fit in a long. 265 // For that we need the difference in seconds between 'seconds' 266 // and 'offset_secs' to be such that: 267 // |seconds - offset_secs| < (2^63/10^9) 268 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 269 // which makes |seconds - offset_secs| < 2^33 270 // and we will prefer +/- 2^32 as the maximum acceptable diff 271 // as 2^32 has a more natural feel than 2^33... 272 // 273 // So if |seconds - offset_secs| >= 2^32 - we return a special 274 // sentinel value (-1) which the caller should take as an 275 // exception value indicating that the offset given to us is 276 // too far from range of the current time - leading to too big 277 // a nano adjustment. The caller is expected to recover by 278 // computing a more accurate offset and calling this method 279 // again. (For the record 2^32 secs is ~136 years, so that 280 // should rarely happen) 281 // 282 jlong diff = seconds - offset_secs; 283 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 284 return -1; // sentinel value: the offset is too far off the target 285 } 286 287 // return the adjustment. If you compute a time by adding 288 // this number of nanoseconds along with the number of seconds 289 // in the offset you should get the current UTC time. 290 return (diff * (jlong)1000000000) + nanos; 291 JVM_END 292 293 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 294 jobject dst, jint dst_pos, jint length)) 295 // Check if we have null pointers 296 if (src == nullptr || dst == nullptr) { 297 THROW(vmSymbols::java_lang_NullPointerException()); 298 } 299 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 300 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 301 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 302 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 303 // Do copy 304 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 305 JVM_END 306 307 308 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 309 JavaValue r(T_OBJECT); 310 // public synchronized Object put(Object key, Object value); 311 HandleMark hm(THREAD); 312 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 313 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK); 314 JavaCalls::call_virtual(&r, 315 props, 316 vmClasses::Properties_klass(), 317 vmSymbols::put_name(), 318 vmSymbols::object_object_object_signature(), 319 key_str, 320 value_str, 321 THREAD); 322 } 323 324 325 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 326 327 /* 328 * Return all of the system properties in a Java String array with alternating 329 * names and values from the jvm SystemProperty. 330 * Which includes some internal and all commandline -D defined properties. 331 */ 332 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 333 ResourceMark rm(THREAD); 334 HandleMark hm(THREAD); 335 int ndx = 0; 336 int fixedCount = 2; 337 338 SystemProperty* p = Arguments::system_properties(); 339 int count = Arguments::PropertyList_count(p); 340 341 // Allocate result String array 342 InstanceKlass* ik = vmClasses::String_klass(); 343 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 344 objArrayHandle result_h(THREAD, r); 345 346 while (p != nullptr) { 347 const char * key = p->key(); 348 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 349 const char * value = p->value(); 350 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 351 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL); 352 result_h->obj_at_put(ndx * 2, key_str()); 353 result_h->obj_at_put(ndx * 2 + 1, value_str()); 354 ndx++; 355 } 356 p = p->next(); 357 } 358 359 // Convert the -XX:MaxDirectMemorySize= command line flag 360 // to the sun.nio.MaxDirectMemorySize property. 361 // Do this after setting user properties to prevent people 362 // from setting the value with a -D option, as requested. 363 // Leave empty if not supplied 364 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 365 char as_chars[256]; 366 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 367 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 368 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 369 result_h->obj_at_put(ndx * 2, key_str()); 370 result_h->obj_at_put(ndx * 2 + 1, value_str()); 371 ndx++; 372 } 373 374 // JVM monitoring and management support 375 // Add the sun.management.compiler property for the compiler's name 376 { 377 #undef CSIZE 378 #if defined(_LP64) || defined(_WIN64) 379 #define CSIZE "64-Bit " 380 #else 381 #define CSIZE 382 #endif // 64bit 383 384 #if COMPILER1_AND_COMPILER2 385 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 386 #else 387 #if defined(COMPILER1) 388 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 389 #elif defined(COMPILER2) 390 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 391 #elif INCLUDE_JVMCI 392 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2" 393 #else 394 const char* compiler_name = ""; 395 #endif // compilers 396 #endif // COMPILER1_AND_COMPILER2 397 398 if (*compiler_name != '\0' && 399 (Arguments::mode() != Arguments::_int)) { 400 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 401 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 402 result_h->obj_at_put(ndx * 2, key_str()); 403 result_h->obj_at_put(ndx * 2 + 1, value_str()); 404 ndx++; 405 } 406 } 407 408 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 409 JVM_END 410 411 412 /* 413 * Return the temporary directory that the VM uses for the attach 414 * and perf data files. 415 * 416 * It is important that this directory is well-known and the 417 * same for all VM instances. It cannot be affected by configuration 418 * variables such as java.io.tmpdir. 419 */ 420 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 421 HandleMark hm(THREAD); 422 const char* temp_dir = os::get_temp_directory(); 423 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 424 return (jstring) JNIHandles::make_local(THREAD, h()); 425 JVM_END 426 427 428 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 429 430 extern volatile jint vm_created; 431 432 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 433 EventShutdown event; 434 if (event.should_commit()) { 435 event.set_reason("Shutdown requested from Java"); 436 event.commit(); 437 } 438 JVM_END 439 440 441 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 442 before_exit(thread, true); 443 vm_exit(code); 444 JVM_END 445 446 447 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 448 if (!DisableExplicitGC) { 449 EventSystemGC event; 450 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent); 451 Universe::heap()->collect(GCCause::_java_lang_system_gc); 452 event.commit(); 453 } 454 JVM_END 455 456 457 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 458 return Universe::heap()->millis_since_last_whole_heap_examined(); 459 JVM_END 460 461 462 static inline jlong convert_size_t_to_jlong(size_t val) { 463 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 464 NOT_LP64 (return (jlong)val;) 465 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 466 } 467 468 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 469 size_t n = Universe::heap()->capacity(); 470 return convert_size_t_to_jlong(n); 471 JVM_END 472 473 474 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 475 size_t n = Universe::heap()->unused(); 476 return convert_size_t_to_jlong(n); 477 JVM_END 478 479 480 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 481 size_t n = Universe::heap()->max_capacity(); 482 return convert_size_t_to_jlong(n); 483 JVM_END 484 485 486 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 487 return os::active_processor_count(); 488 JVM_END 489 490 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void)) 491 #ifdef LINUX 492 if (UseContainerSupport) { 493 return JNI_TRUE; 494 } 495 #endif 496 return JNI_FALSE; 497 JVM_END 498 499 // java.lang.Throwable ////////////////////////////////////////////////////// 500 501 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 502 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 503 java_lang_Throwable::fill_in_stack_trace(exception); 504 JVM_END 505 506 // java.lang.NullPointerException /////////////////////////////////////////// 507 508 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 509 if (!ShowCodeDetailsInExceptionMessages) return nullptr; 510 511 oop exc = JNIHandles::resolve_non_null(throwable); 512 513 Method* method; 514 int bci; 515 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 516 return nullptr; 517 } 518 if (method->is_native()) { 519 return nullptr; 520 } 521 522 stringStream ss; 523 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 524 if (ok) { 525 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 526 return (jstring) JNIHandles::make_local(THREAD, result); 527 } else { 528 return nullptr; 529 } 530 JVM_END 531 532 // java.lang.StackTraceElement ////////////////////////////////////////////// 533 534 535 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth)) 536 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace)); 537 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 538 objArrayHandle stack_trace(THREAD, st); 539 // Fill in the allocated stack trace 540 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK); 541 JVM_END 542 543 544 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 545 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 546 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 547 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK); 548 JVM_END 549 550 551 // java.lang.StackWalker ////////////////////////////////////////////////////// 552 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj)) 553 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj)); 554 555 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr); 556 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr); 557 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info()); 558 if (!have_name) { 559 oop name = StringTable::intern(method->name(), CHECK); 560 java_lang_StackFrameInfo::set_name(stack_frame_info(), name); 561 } 562 if (!have_type) { 563 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK); 564 java_lang_StackFrameInfo::set_type(stack_frame_info(), type()); 565 } 566 JVM_END 567 568 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode, 569 jint skip_frames, jobject contScope, jobject cont, 570 jint buffer_size, jint start_index, jobjectArray frames)) 571 if (!thread->has_last_Java_frame()) { 572 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr); 573 } 574 575 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 576 Handle contScope_h(THREAD, JNIHandles::resolve(contScope)); 577 Handle cont_h(THREAD, JNIHandles::resolve(cont)); 578 // frames array is a ClassFrameInfo[] array when only getting caller reference, 579 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 580 // be null. 581 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 582 objArrayHandle frames_array_h(THREAD, fa); 583 584 if (frames_array_h->length() < buffer_size) { 585 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr); 586 } 587 588 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h, 589 buffer_size, start_index, frames_array_h, CHECK_NULL); 590 return JNIHandles::make_local(THREAD, result); 591 JVM_END 592 593 594 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor, 595 jint last_batch_count, jint buffer_size, jint start_index, 596 jobjectArray frames)) 597 // frames array is a ClassFrameInfo[] array when only getting caller reference, 598 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 599 // be null. 600 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 601 objArrayHandle frames_array_h(THREAD, fa); 602 603 if (frames_array_h->length() < buffer_size) { 604 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 605 } 606 607 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 608 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size, 609 start_index, frames_array_h, THREAD); 610 JVM_END 611 612 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont)) 613 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 614 objArrayHandle frames_array_h(THREAD, fa); 615 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 616 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont)); 617 618 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD); 619 JVM_END 620 621 // java.lang.Object /////////////////////////////////////////////// 622 623 624 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 625 // as implemented in the classic virtual machine; return 0 if object is null 626 return handle == nullptr ? 0 : 627 checked_cast<jint>(ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle))); 628 JVM_END 629 630 631 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 632 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 633 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 634 if (JvmtiExport::should_post_monitor_wait()) { 635 JvmtiExport::post_monitor_wait(thread, obj(), ms); 636 637 // The current thread already owns the monitor and it has not yet 638 // been added to the wait queue so the current thread cannot be 639 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 640 // event handler cannot accidentally consume an unpark() meant for 641 // the ParkEvent associated with this ObjectMonitor. 642 } 643 ObjectSynchronizer::wait(obj, ms, CHECK); 644 JVM_END 645 646 647 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 648 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 649 ObjectSynchronizer::notify(obj, CHECK); 650 JVM_END 651 652 653 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 654 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 655 ObjectSynchronizer::notifyall(obj, CHECK); 656 JVM_END 657 658 659 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 660 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 661 Klass* klass = obj->klass(); 662 JvmtiVMObjectAllocEventCollector oam; 663 664 #ifdef ASSERT 665 // Just checking that the cloneable flag is set correct 666 if (obj->is_array()) { 667 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 668 } else { 669 guarantee(obj->is_instance(), "should be instanceOop"); 670 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass()); 671 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 672 } 673 #endif 674 675 // Check if class of obj supports the Cloneable interface. 676 // All arrays are considered to be cloneable (See JLS 20.1.5). 677 // All j.l.r.Reference classes are considered non-cloneable. 678 if (!klass->is_cloneable() || 679 (klass->is_instance_klass() && 680 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 681 ResourceMark rm(THREAD); 682 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 683 } 684 685 // Make shallow object copy 686 const size_t size = obj->size(); 687 oop new_obj_oop = nullptr; 688 if (obj->is_array()) { 689 const int length = ((arrayOop)obj())->length(); 690 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 691 /* do_zero */ true, CHECK_NULL); 692 } else { 693 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 694 } 695 696 HeapAccess<>::clone(obj(), new_obj_oop, size); 697 698 Handle new_obj(THREAD, new_obj_oop); 699 // Caution: this involves a java upcall, so the clone should be 700 // "gc-robust" by this stage. 701 if (klass->has_finalizer()) { 702 assert(obj->is_instance(), "should be instanceOop"); 703 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 704 new_obj = Handle(THREAD, new_obj_oop); 705 } 706 707 return JNIHandles::make_local(THREAD, new_obj()); 708 JVM_END 709 710 // java.lang.ref.Finalizer //////////////////////////////////////////////////// 711 712 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee)) 713 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);) 714 JVM_END 715 716 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env)) 717 return InstanceKlass::is_finalization_enabled(); 718 JVM_END 719 720 // jdk.internal.vm.Continuation ///////////////////////////////////////////////////// 721 722 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls)) 723 CONT_RegisterNativeMethods(env, cls); 724 JVM_END 725 726 // java.io.File /////////////////////////////////////////////////////////////// 727 728 JVM_LEAF(char*, JVM_NativePath(char* path)) 729 return os::native_path(path); 730 JVM_END 731 732 733 // Misc. class handling /////////////////////////////////////////////////////////// 734 735 736 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 737 // Getting the class of the caller frame. 738 // 739 // The call stack at this point looks something like this: 740 // 741 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ] 742 // [1] [ @CallerSensitive API.method ] 743 // [.] [ (skipped intermediate frames) ] 744 // [n] [ caller ] 745 vframeStream vfst(thread); 746 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 747 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 748 Method* m = vfst.method(); 749 assert(m != nullptr, "sanity"); 750 switch (n) { 751 case 0: 752 // This must only be called from Reflection.getCallerClass 753 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 754 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 755 } 756 // fall-through 757 case 1: 758 // Frame 0 and 1 must be caller sensitive. 759 if (!m->caller_sensitive()) { 760 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 761 } 762 break; 763 default: 764 if (!m->is_ignored_by_security_stack_walk()) { 765 // We have reached the desired frame; return the holder class. 766 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror()); 767 } 768 break; 769 } 770 } 771 return nullptr; 772 JVM_END 773 774 775 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 776 oop mirror = nullptr; 777 BasicType t = name2type(utf); 778 if (t != T_ILLEGAL && !is_reference_type(t)) { 779 mirror = Universe::java_mirror(t); 780 } 781 if (mirror == nullptr) { 782 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 783 } else { 784 return (jclass) JNIHandles::make_local(THREAD, mirror); 785 } 786 JVM_END 787 788 789 // Returns a class loaded by the bootstrap class loader; or null 790 // if not found. ClassNotFoundException is not thrown. 791 // FindClassFromBootLoader is exported to the launcher for windows. 792 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 793 const char* name)) 794 // Java libraries should ensure that name is never null or illegal. 795 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) { 796 // It's impossible to create this class; the name cannot fit 797 // into the constant pool. 798 return nullptr; 799 } 800 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name"); 801 802 TempNewSymbol h_name = SymbolTable::new_symbol(name); 803 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 804 if (k == nullptr) { 805 return nullptr; 806 } 807 808 if (log_is_enabled(Debug, class, resolve)) { 809 trace_class_resolution(k); 810 } 811 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 812 JVM_END 813 814 // Find a class with this name in this loader, using the caller's protection domain. 815 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 816 jboolean init, jobject loader, 817 jclass caller)) 818 TempNewSymbol h_name = 819 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 820 CHECK_NULL); 821 822 oop loader_oop = JNIHandles::resolve(loader); 823 oop from_class = JNIHandles::resolve(caller); 824 oop protection_domain = nullptr; 825 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 826 // NPE. Put it in another way, the bootstrap class loader has all permission and 827 // thus no checkPackageAccess equivalence in the VM class loader. 828 // The caller is also passed as null by the java code if there is no security 829 // manager to avoid the performance cost of getting the calling class. 830 if (from_class != nullptr && loader_oop != nullptr) { 831 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 832 } 833 834 Handle h_loader(THREAD, loader_oop); 835 Handle h_prot(THREAD, protection_domain); 836 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 837 h_prot, false, THREAD); 838 839 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 840 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 841 } 842 return result; 843 JVM_END 844 845 // Currently only called from the old verifier. 846 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 847 jboolean init, jclass from)) 848 TempNewSymbol h_name = 849 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 850 CHECK_NULL); 851 oop from_class_oop = JNIHandles::resolve(from); 852 Klass* from_class = (from_class_oop == nullptr) 853 ? (Klass*)nullptr 854 : java_lang_Class::as_Klass(from_class_oop); 855 oop class_loader = nullptr; 856 oop protection_domain = nullptr; 857 if (from_class != nullptr) { 858 class_loader = from_class->class_loader(); 859 protection_domain = from_class->protection_domain(); 860 } 861 Handle h_loader(THREAD, class_loader); 862 Handle h_prot (THREAD, protection_domain); 863 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 864 h_prot, true, thread); 865 866 if (log_is_enabled(Debug, class, resolve) && result != nullptr) { 867 // this function is generally only used for class loading during verification. 868 ResourceMark rm; 869 oop from_mirror = JNIHandles::resolve_non_null(from); 870 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 871 const char * from_name = from_class->external_name(); 872 873 oop mirror = JNIHandles::resolve_non_null(result); 874 Klass* to_class = java_lang_Class::as_Klass(mirror); 875 const char * to = to_class->external_name(); 876 log_debug(class, resolve)("%s %s (verification)", from_name, to); 877 } 878 879 return result; 880 JVM_END 881 882 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 883 static jclass jvm_define_class_common(const char *name, 884 jobject loader, const jbyte *buf, 885 jsize len, jobject pd, const char *source, 886 TRAPS) { 887 if (source == nullptr) source = "__JVM_DefineClass__"; 888 889 JavaThread* jt = THREAD; 890 891 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 892 ClassLoader::perf_define_appclass_selftime(), 893 ClassLoader::perf_define_appclasses(), 894 jt->get_thread_stat()->perf_recursion_counts_addr(), 895 jt->get_thread_stat()->perf_timers_addr(), 896 PerfClassTraceTime::DEFINE_CLASS); 897 898 if (UsePerfData) { 899 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 900 } 901 902 // Class resolution will get the class name from the .class stream if the name is null. 903 TempNewSymbol class_name = name == nullptr ? nullptr : 904 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 905 CHECK_NULL); 906 907 ResourceMark rm(THREAD); 908 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 909 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 910 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 911 ClassLoadInfo cl_info(protection_domain); 912 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name, 913 class_loader, 914 cl_info, 915 CHECK_NULL); 916 917 if (log_is_enabled(Debug, class, resolve)) { 918 trace_class_resolution(k); 919 } 920 921 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 922 } 923 924 enum { 925 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 926 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 927 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 928 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 929 }; 930 931 /* 932 * Define a class with the specified flags that indicates if it's a nestmate, 933 * hidden, or strongly referenced from class loader. 934 */ 935 static jclass jvm_lookup_define_class(jclass lookup, const char *name, 936 const jbyte *buf, jsize len, jobject pd, 937 jboolean init, int flags, jobject classData, TRAPS) { 938 ResourceMark rm(THREAD); 939 940 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup)); 941 // Lookup class must be a non-null instance 942 if (lookup_k == nullptr) { 943 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 944 } 945 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass"); 946 947 Handle class_loader (THREAD, lookup_k->class_loader()); 948 949 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 950 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 951 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 952 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 953 954 InstanceKlass* host_class = nullptr; 955 if (is_nestmate) { 956 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL); 957 } 958 959 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 960 name, 961 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 962 is_nestmate ? host_class->external_name() : "", 963 is_hidden ? "hidden" : "not hidden", 964 is_strong ? "strong" : "weak", 965 vm_annotations ? "with vm annotations" : "without vm annotation"); 966 967 if (!is_hidden) { 968 // classData is only applicable for hidden classes 969 if (classData != nullptr) { 970 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 971 } 972 if (is_nestmate) { 973 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 974 } 975 if (!is_strong) { 976 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 977 } 978 if (vm_annotations) { 979 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 980 } 981 if (flags != STRONG_LOADER_LINK) { 982 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 983 err_msg("invalid flag 0x%x", flags)); 984 } 985 } 986 987 // Class resolution will get the class name from the .class stream if the name is null. 988 TempNewSymbol class_name = name == nullptr ? nullptr : 989 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 990 CHECK_NULL); 991 992 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 993 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 994 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 995 996 InstanceKlass* ik = nullptr; 997 if (!is_hidden) { 998 ClassLoadInfo cl_info(protection_domain); 999 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1000 class_loader, 1001 cl_info, 1002 CHECK_NULL); 1003 1004 if (log_is_enabled(Debug, class, resolve)) { 1005 trace_class_resolution(ik); 1006 } 1007 } else { // hidden 1008 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1009 ClassLoadInfo cl_info(protection_domain, 1010 host_class, 1011 classData_h, 1012 is_hidden, 1013 is_strong, 1014 vm_annotations); 1015 ik = SystemDictionary::resolve_from_stream(&st, class_name, 1016 class_loader, 1017 cl_info, 1018 CHECK_NULL); 1019 1020 // The hidden class loader data has been artificially been kept alive to 1021 // this point. The mirror and any instances of this class have to keep 1022 // it alive afterwards. 1023 ik->class_loader_data()->dec_keep_alive(); 1024 1025 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1026 ModuleEntry* module = ik->module(); 1027 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1028 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1029 module_name, 1030 ik->external_name(), 1031 host_class->external_name(), 1032 ik->is_hidden() ? "is hidden" : "is not hidden"); 1033 } 1034 } 1035 1036 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) { 1037 // non-hidden class or nestmate class must be in the same package as the Lookup class 1038 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages"); 1039 } 1040 1041 if (init) { 1042 ik->initialize(CHECK_NULL); 1043 } else { 1044 ik->link_class(CHECK_NULL); 1045 } 1046 1047 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror()); 1048 } 1049 1050 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1051 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD); 1052 JVM_END 1053 1054 /* 1055 * Define a class with the specified lookup class. 1056 * lookup: Lookup class 1057 * name: the name of the class 1058 * buf: class bytes 1059 * len: length of class bytes 1060 * pd: protection domain 1061 * init: initialize the class 1062 * flags: properties of the class 1063 * classData: private static pre-initialized field 1064 */ 1065 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1066 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1067 1068 if (lookup == nullptr) { 1069 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1070 } 1071 1072 assert(buf != nullptr, "buf must not be null"); 1073 1074 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1075 JVM_END 1076 1077 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1078 1079 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD); 1080 JVM_END 1081 1082 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1083 ResourceMark rm(THREAD); 1084 1085 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1086 char* str = java_lang_String::as_utf8_string(h_name()); 1087 1088 // Sanity check, don't expect null 1089 if (str == nullptr) return nullptr; 1090 1091 // Internalize the string, converting '.' to '/' in string. 1092 char* p = (char*)str; 1093 while (*p != '\0') { 1094 if (*p == '.') { 1095 *p = '/'; 1096 } 1097 p++; 1098 } 1099 1100 const int str_len = (int)(p - str); 1101 if (str_len > Symbol::max_length()) { 1102 // It's impossible to create this class; the name cannot fit 1103 // into the constant pool. 1104 return nullptr; 1105 } 1106 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1107 1108 // Security Note: 1109 // The Java level wrapper will perform the necessary security check allowing 1110 // us to pass the null as the initiating class loader. 1111 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1112 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, 1113 h_loader, 1114 Handle()); 1115 #if INCLUDE_CDS 1116 if (k == nullptr) { 1117 // If the class is not already loaded, try to see if it's in the shared 1118 // archive for the current classloader (h_loader). 1119 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1120 } 1121 #endif 1122 return (k == nullptr) ? nullptr : 1123 (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 1124 JVM_END 1125 1126 // Module support ////////////////////////////////////////////////////////////////////////////// 1127 1128 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1129 jstring location, jobjectArray packages)) 1130 Handle h_module (THREAD, JNIHandles::resolve(module)); 1131 Modules::define_module(h_module, is_open, version, location, packages, CHECK); 1132 JVM_END 1133 1134 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1135 Handle h_module (THREAD, JNIHandles::resolve(module)); 1136 Modules::set_bootloader_unnamed_module(h_module, CHECK); 1137 JVM_END 1138 1139 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1140 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1141 Handle h_to_module (THREAD, JNIHandles::resolve(to_module)); 1142 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK); 1143 JVM_END 1144 1145 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1146 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1147 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK); 1148 JVM_END 1149 1150 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1151 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1152 Modules::add_module_exports(h_from_module, package, Handle(), CHECK); 1153 JVM_END 1154 1155 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1156 Handle h_from_module (THREAD, JNIHandles::resolve(from_module)); 1157 Handle h_source_module (THREAD, JNIHandles::resolve(source_module)); 1158 Modules::add_reads_module(h_from_module, h_source_module, CHECK); 1159 JVM_END 1160 1161 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader)) 1162 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader)); 1163 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader)); 1164 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK); 1165 JVM_END 1166 1167 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1168 1169 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1170 assert (cls != nullptr, "illegal class"); 1171 JvmtiVMObjectAllocEventCollector oam; 1172 ResourceMark rm(THREAD); 1173 HandleMark hm(THREAD); 1174 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1175 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1176 return (jstring) JNIHandles::make_local(THREAD, result); 1177 JVM_END 1178 1179 1180 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1181 JvmtiVMObjectAllocEventCollector oam; 1182 oop mirror = JNIHandles::resolve_non_null(cls); 1183 1184 // Special handling for primitive objects 1185 if (java_lang_Class::is_primitive(mirror)) { 1186 // Primitive objects does not have any interfaces 1187 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1188 return (jobjectArray) JNIHandles::make_local(THREAD, r); 1189 } 1190 1191 Klass* klass = java_lang_Class::as_Klass(mirror); 1192 // Figure size of result array 1193 int size; 1194 if (klass->is_instance_klass()) { 1195 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1196 } else { 1197 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1198 size = 2; 1199 } 1200 1201 // Allocate result array 1202 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL); 1203 objArrayHandle result (THREAD, r); 1204 // Fill in result 1205 if (klass->is_instance_klass()) { 1206 // Regular instance klass, fill in all local interfaces 1207 for (int index = 0; index < size; index++) { 1208 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1209 result->obj_at_put(index, k->java_mirror()); 1210 } 1211 } else { 1212 // All arrays implement java.lang.Cloneable and java.io.Serializable 1213 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror()); 1214 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror()); 1215 } 1216 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1217 JVM_END 1218 1219 1220 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1221 oop mirror = JNIHandles::resolve_non_null(cls); 1222 if (java_lang_Class::is_primitive(mirror)) { 1223 return JNI_FALSE; 1224 } 1225 Klass* k = java_lang_Class::as_Klass(mirror); 1226 jboolean result = k->is_interface(); 1227 assert(!result || k->is_instance_klass(), 1228 "all interfaces are instance types"); 1229 // The compiler intrinsic for isInterface tests the 1230 // Klass::_access_flags bits in the same way. 1231 return result; 1232 JVM_END 1233 1234 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1235 oop mirror = JNIHandles::resolve_non_null(cls); 1236 if (java_lang_Class::is_primitive(mirror)) { 1237 return JNI_FALSE; 1238 } 1239 Klass* k = java_lang_Class::as_Klass(mirror); 1240 return k->is_hidden(); 1241 JVM_END 1242 1243 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1244 JvmtiVMObjectAllocEventCollector oam; 1245 oop mirror = JNIHandles::resolve_non_null(cls); 1246 if (java_lang_Class::is_primitive(mirror)) { 1247 // There are no signers for primitive types 1248 return nullptr; 1249 } 1250 1251 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror)); 1252 1253 // If there are no signers set in the class, or if the class 1254 // is an array, return null. 1255 if (signers == nullptr) return nullptr; 1256 1257 // copy of the signers array 1258 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1259 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1260 for (int index = 0; index < signers->length(); index++) { 1261 signers_copy->obj_at_put(index, signers->obj_at(index)); 1262 } 1263 1264 // return the copy 1265 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy); 1266 JVM_END 1267 1268 1269 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1270 oop mirror = JNIHandles::resolve_non_null(cls); 1271 if (!java_lang_Class::is_primitive(mirror)) { 1272 // This call is ignored for primitive types and arrays. 1273 // Signers are only set once, ClassLoader.java, and thus shouldn't 1274 // be called with an array. Only the bootstrap loader creates arrays. 1275 Klass* k = java_lang_Class::as_Klass(mirror); 1276 if (k->is_instance_klass()) { 1277 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1278 } 1279 } 1280 JVM_END 1281 1282 1283 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1284 oop mirror = JNIHandles::resolve_non_null(cls); 1285 if (mirror == nullptr) { 1286 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 1287 } 1288 1289 if (java_lang_Class::is_primitive(mirror)) { 1290 // Primitive types does not have a protection domain. 1291 return nullptr; 1292 } 1293 1294 oop pd = java_lang_Class::protection_domain(mirror); 1295 return (jobject) JNIHandles::make_local(THREAD, pd); 1296 JVM_END 1297 1298 1299 // Returns the inherited_access_control_context field of the running thread. 1300 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1301 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1302 return JNIHandles::make_local(THREAD, result); 1303 JVM_END 1304 1305 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1306 if (!UsePrivilegedStack) return nullptr; 1307 1308 ResourceMark rm(THREAD); 1309 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1310 JvmtiVMObjectAllocEventCollector oam; 1311 1312 // count the protection domains on the execution stack. We collapse 1313 // duplicate consecutive protection domains into a single one, as 1314 // well as stopping when we hit a privileged frame. 1315 1316 oop previous_protection_domain = nullptr; 1317 Handle privileged_context(thread, nullptr); 1318 bool is_privileged = false; 1319 oop protection_domain = nullptr; 1320 1321 // Iterate through Java frames 1322 vframeStream vfst(thread); 1323 for(; !vfst.at_end(); vfst.next()) { 1324 // get method of frame 1325 Method* method = vfst.method(); 1326 1327 // stop at the first privileged frame 1328 if (method->method_holder() == vmClasses::AccessController_klass() && 1329 method->name() == vmSymbols::executePrivileged_name()) 1330 { 1331 // this frame is privileged 1332 is_privileged = true; 1333 1334 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1335 1336 StackValueCollection* locals = priv->locals(); 1337 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1338 StackValue* clr_sv = locals->at(2); // Class<?> caller 1339 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1340 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1341 privileged_context = ctx_sv->get_obj(); 1342 Handle caller = clr_sv->get_obj(); 1343 1344 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1345 protection_domain = caller_klass->protection_domain(); 1346 } else { 1347 protection_domain = method->method_holder()->protection_domain(); 1348 } 1349 1350 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) { 1351 local_array->push(Handle(thread, protection_domain)); 1352 previous_protection_domain = protection_domain; 1353 } 1354 1355 if (is_privileged) break; 1356 } 1357 1358 1359 // either all the domains on the stack were system domains, or 1360 // we had a privileged system domain 1361 if (local_array->is_empty()) { 1362 if (is_privileged && privileged_context.is_null()) return nullptr; 1363 1364 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1365 return JNIHandles::make_local(THREAD, result); 1366 } 1367 1368 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(), 1369 local_array->length(), CHECK_NULL); 1370 objArrayHandle h_context(thread, context); 1371 for (int index = 0; index < local_array->length(); index++) { 1372 h_context->obj_at_put(index, local_array->at(index)()); 1373 } 1374 1375 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1376 1377 return JNIHandles::make_local(THREAD, result); 1378 JVM_END 1379 1380 class ScopedValueBindingsResolver { 1381 public: 1382 InstanceKlass* Carrier_klass; 1383 ScopedValueBindingsResolver(JavaThread* THREAD) { 1384 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD); 1385 Carrier_klass = InstanceKlass::cast(k); 1386 } 1387 }; 1388 1389 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls)) 1390 ResourceMark rm(THREAD); 1391 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12); 1392 JvmtiVMObjectAllocEventCollector oam; 1393 1394 static ScopedValueBindingsResolver resolver(THREAD); 1395 1396 // Iterate through Java frames 1397 vframeStream vfst(thread); 1398 for(; !vfst.at_end(); vfst.next()) { 1399 int loc = -1; 1400 // get method of frame 1401 Method* method = vfst.method(); 1402 1403 Symbol *name = method->name(); 1404 1405 InstanceKlass* holder = method->method_holder(); 1406 if (name == vmSymbols::runWith_method_name()) { 1407 if (holder == vmClasses::Thread_klass() 1408 || holder == resolver.Carrier_klass) { 1409 loc = 1; 1410 } 1411 } 1412 1413 if (loc != -1) { 1414 javaVFrame *frame = vfst.asJavaVFrame(); 1415 StackValueCollection* locals = frame->locals(); 1416 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot 1417 Handle result = head_sv->get_obj(); 1418 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1419 if (result() != nullptr) { 1420 return JNIHandles::make_local(THREAD, result()); 1421 } 1422 } 1423 } 1424 1425 return nullptr; 1426 JVM_END 1427 1428 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1429 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1430 return (k != nullptr) && k->is_array_klass() ? true : false; 1431 JVM_END 1432 1433 1434 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1435 oop mirror = JNIHandles::resolve_non_null(cls); 1436 return (jboolean) java_lang_Class::is_primitive(mirror); 1437 JVM_END 1438 1439 1440 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1441 oop mirror = JNIHandles::resolve_non_null(cls); 1442 if (java_lang_Class::is_primitive(mirror)) { 1443 // Primitive type 1444 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1445 } 1446 1447 Klass* k = java_lang_Class::as_Klass(mirror); 1448 debug_only(int computed_modifiers = k->compute_modifier_flags()); 1449 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1450 return k->modifier_flags(); 1451 JVM_END 1452 1453 1454 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1455 1456 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1457 JvmtiVMObjectAllocEventCollector oam; 1458 // ofClass is a reference to a java_lang_Class object. The mirror object 1459 // of an InstanceKlass 1460 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1461 if (java_lang_Class::is_primitive(ofMirror) || 1462 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) { 1463 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1464 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1465 } 1466 1467 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1468 InnerClassesIterator iter(k); 1469 1470 if (iter.length() == 0) { 1471 // Neither an inner nor outer class 1472 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL); 1473 return (jobjectArray)JNIHandles::make_local(THREAD, result); 1474 } 1475 1476 // find inner class info 1477 constantPoolHandle cp(thread, k->constants()); 1478 int length = iter.length(); 1479 1480 // Allocate temp. result array 1481 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL); 1482 objArrayHandle result (THREAD, r); 1483 int members = 0; 1484 1485 for (; !iter.done(); iter.next()) { 1486 int ioff = iter.inner_class_info_index(); 1487 int ooff = iter.outer_class_info_index(); 1488 1489 if (ioff != 0 && ooff != 0) { 1490 // Check to see if the name matches the class we're looking for 1491 // before attempting to find the class. 1492 if (cp->klass_name_at_matches(k, ooff)) { 1493 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1494 if (outer_klass == k) { 1495 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1496 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1497 1498 // Throws an exception if outer klass has not declared k as 1499 // an inner klass 1500 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1501 1502 result->obj_at_put(members, inner_klass->java_mirror()); 1503 members++; 1504 } 1505 } 1506 } 1507 } 1508 1509 if (members != length) { 1510 // Return array of right length 1511 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL); 1512 for(int i = 0; i < members; i++) { 1513 res->obj_at_put(i, result->obj_at(i)); 1514 } 1515 return (jobjectArray)JNIHandles::make_local(THREAD, res); 1516 } 1517 1518 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1519 JVM_END 1520 1521 1522 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1523 { 1524 // ofClass is a reference to a java_lang_Class object. 1525 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1526 if (java_lang_Class::is_primitive(ofMirror)) { 1527 return nullptr; 1528 } 1529 Klass* klass = java_lang_Class::as_Klass(ofMirror); 1530 if (!klass->is_instance_klass()) { 1531 return nullptr; 1532 } 1533 1534 bool inner_is_member = false; 1535 Klass* outer_klass 1536 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1537 if (outer_klass == nullptr) return nullptr; // already a top-level class 1538 if (!inner_is_member) return nullptr; // a hidden class (inside a method) 1539 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror()); 1540 } 1541 JVM_END 1542 1543 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1544 { 1545 oop mirror = JNIHandles::resolve_non_null(cls); 1546 if (java_lang_Class::is_primitive(mirror)) { 1547 return nullptr; 1548 } 1549 Klass* klass = java_lang_Class::as_Klass(mirror); 1550 if (!klass->is_instance_klass()) { 1551 return nullptr; 1552 } 1553 InstanceKlass* k = InstanceKlass::cast(klass); 1554 int ooff = 0, noff = 0; 1555 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1556 if (noff != 0) { 1557 constantPoolHandle i_cp(thread, k->constants()); 1558 Symbol* name = i_cp->symbol_at(noff); 1559 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1560 return (jstring) JNIHandles::make_local(THREAD, str()); 1561 } 1562 } 1563 return nullptr; 1564 } 1565 JVM_END 1566 1567 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1568 assert (cls != nullptr, "illegal class"); 1569 JvmtiVMObjectAllocEventCollector oam; 1570 ResourceMark rm(THREAD); 1571 oop mirror = JNIHandles::resolve_non_null(cls); 1572 // Return null for arrays and primitives 1573 if (!java_lang_Class::is_primitive(mirror)) { 1574 Klass* k = java_lang_Class::as_Klass(mirror); 1575 if (k->is_instance_klass()) { 1576 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1577 if (sym == nullptr) return nullptr; 1578 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1579 return (jstring) JNIHandles::make_local(THREAD, str()); 1580 } 1581 } 1582 return nullptr; 1583 JVM_END 1584 1585 1586 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1587 assert (cls != nullptr, "illegal class"); 1588 oop mirror = JNIHandles::resolve_non_null(cls); 1589 // Return null for arrays and primitives 1590 if (!java_lang_Class::is_primitive(mirror)) { 1591 Klass* k = java_lang_Class::as_Klass(mirror); 1592 if (k->is_instance_klass()) { 1593 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1594 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1595 } 1596 } 1597 return nullptr; 1598 JVM_END 1599 1600 1601 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) { 1602 // some of this code was adapted from from jni_FromReflectedField 1603 1604 oop reflected = JNIHandles::resolve_non_null(field); 1605 oop mirror = java_lang_reflect_Field::clazz(reflected); 1606 Klass* k = java_lang_Class::as_Klass(mirror); 1607 int slot = java_lang_reflect_Field::slot(reflected); 1608 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1609 1610 InstanceKlass* ik = InstanceKlass::cast(k); 1611 int offset = ik->field_offset(slot); 1612 1613 if (modifiers & JVM_ACC_STATIC) { 1614 // for static fields we only look in the current class 1615 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1616 assert(false, "cannot find static field"); 1617 return false; 1618 } 1619 } else { 1620 // for instance fields we start with the current class and work 1621 // our way up through the superclass chain 1622 if (!ik->find_field_from_offset(offset, false, &fd)) { 1623 assert(false, "cannot find instance field"); 1624 return false; 1625 } 1626 } 1627 return true; 1628 } 1629 1630 static Method* jvm_get_method_common(jobject method) { 1631 // some of this code was adapted from from jni_FromReflectedMethod 1632 1633 oop reflected = JNIHandles::resolve_non_null(method); 1634 oop mirror = nullptr; 1635 int slot = 0; 1636 1637 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) { 1638 mirror = java_lang_reflect_Constructor::clazz(reflected); 1639 slot = java_lang_reflect_Constructor::slot(reflected); 1640 } else { 1641 assert(reflected->klass() == vmClasses::reflect_Method_klass(), 1642 "wrong type"); 1643 mirror = java_lang_reflect_Method::clazz(reflected); 1644 slot = java_lang_reflect_Method::slot(reflected); 1645 } 1646 Klass* k = java_lang_Class::as_Klass(mirror); 1647 1648 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1649 assert(m != nullptr, "cannot find method"); 1650 return m; // caller has to deal with null in product mode 1651 } 1652 1653 /* Type use annotations support (JDK 1.8) */ 1654 1655 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1656 assert (cls != nullptr, "illegal class"); 1657 ResourceMark rm(THREAD); 1658 // Return null for arrays and primitives 1659 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1660 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1661 if (k->is_instance_klass()) { 1662 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1663 if (type_annotations != nullptr) { 1664 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1665 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1666 } 1667 } 1668 } 1669 return nullptr; 1670 JVM_END 1671 1672 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1673 assert (method != nullptr, "illegal method"); 1674 // method is a handle to a java.lang.reflect.Method object 1675 Method* m = jvm_get_method_common(method); 1676 if (m == nullptr) { 1677 return nullptr; 1678 } 1679 1680 AnnotationArray* type_annotations = m->type_annotations(); 1681 if (type_annotations != nullptr) { 1682 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1683 return (jbyteArray) JNIHandles::make_local(THREAD, a); 1684 } 1685 1686 return nullptr; 1687 JVM_END 1688 1689 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1690 assert (field != nullptr, "illegal field"); 1691 fieldDescriptor fd; 1692 bool gotFd = jvm_get_field_common(field, fd); 1693 if (!gotFd) { 1694 return nullptr; 1695 } 1696 1697 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1698 JVM_END 1699 1700 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1701 if (!cp->is_within_bounds(index)) { 1702 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1703 } 1704 } 1705 1706 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1707 { 1708 // method is a handle to a java.lang.reflect.Method object 1709 Method* method_ptr = jvm_get_method_common(method); 1710 methodHandle mh (THREAD, method_ptr); 1711 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1712 const int num_params = mh->method_parameters_length(); 1713 1714 if (num_params < 0) { 1715 // A -1 return value from method_parameters_length means there is no 1716 // parameter data. Return null to indicate this to the reflection 1717 // API. 1718 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1719 return (jobjectArray)nullptr; 1720 } else { 1721 // Otherwise, we return something up to reflection, even if it is 1722 // a zero-length array. Why? Because in some cases this can 1723 // trigger a MalformedParametersException. 1724 1725 // make sure all the symbols are properly formatted 1726 for (int i = 0; i < num_params; i++) { 1727 MethodParametersElement* params = mh->method_parameters_start(); 1728 int index = params[i].name_cp_index; 1729 constantPoolHandle cp(THREAD, mh->constants()); 1730 bounds_check(cp, index, CHECK_NULL); 1731 1732 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1733 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1734 "Wrong type at constant pool index"); 1735 } 1736 1737 } 1738 1739 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL); 1740 objArrayHandle result (THREAD, result_oop); 1741 1742 for (int i = 0; i < num_params; i++) { 1743 MethodParametersElement* params = mh->method_parameters_start(); 1744 // For a 0 index, give a null symbol 1745 Symbol* sym = 0 != params[i].name_cp_index ? 1746 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr; 1747 int flags = params[i].flags; 1748 oop param = Reflection::new_parameter(reflected_method, i, sym, 1749 flags, CHECK_NULL); 1750 result->obj_at_put(i, param); 1751 } 1752 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1753 } 1754 } 1755 JVM_END 1756 1757 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1758 1759 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1760 { 1761 JvmtiVMObjectAllocEventCollector oam; 1762 1763 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1764 // Exclude primitive types and array types 1765 if (java_lang_Class::is_primitive(ofMirror) || 1766 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1767 // Return empty array 1768 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL); 1769 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1770 } 1771 1772 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1773 constantPoolHandle cp(THREAD, k->constants()); 1774 1775 // Ensure class is linked 1776 k->link_class(CHECK_NULL); 1777 1778 // Allocate result 1779 int num_fields; 1780 1781 if (publicOnly) { 1782 num_fields = 0; 1783 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1784 if (fs.access_flags().is_public()) ++num_fields; 1785 } 1786 } else { 1787 num_fields = k->java_fields_count(); 1788 } 1789 1790 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL); 1791 objArrayHandle result (THREAD, r); 1792 1793 int out_idx = 0; 1794 fieldDescriptor fd; 1795 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1796 if (!publicOnly || fs.access_flags().is_public()) { 1797 fd.reinitialize(k, fs.index()); 1798 oop field = Reflection::new_field(&fd, CHECK_NULL); 1799 result->obj_at_put(out_idx, field); 1800 ++out_idx; 1801 } 1802 } 1803 assert(out_idx == num_fields, "just checking"); 1804 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1805 } 1806 JVM_END 1807 1808 // A class is a record if and only if it is final and a direct subclass of 1809 // java.lang.Record and has a Record attribute; otherwise, it is not a record. 1810 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1811 { 1812 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1813 if (k != nullptr && k->is_instance_klass()) { 1814 InstanceKlass* ik = InstanceKlass::cast(k); 1815 return ik->is_record(); 1816 } else { 1817 return false; 1818 } 1819 } 1820 JVM_END 1821 1822 // Returns an array containing the components of the Record attribute, 1823 // or null if the attribute is not present. 1824 // 1825 // Note that this function returns the components of the Record attribute 1826 // even if the class is not a record. 1827 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1828 { 1829 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1830 assert(c->is_instance_klass(), "must be"); 1831 InstanceKlass* ik = InstanceKlass::cast(c); 1832 1833 Array<RecordComponent*>* components = ik->record_components(); 1834 if (components != nullptr) { 1835 JvmtiVMObjectAllocEventCollector oam; 1836 constantPoolHandle cp(THREAD, ik->constants()); 1837 int length = components->length(); 1838 assert(length >= 0, "unexpected record_components length"); 1839 objArrayOop record_components = 1840 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL); 1841 objArrayHandle components_h (THREAD, record_components); 1842 1843 for (int x = 0; x < length; x++) { 1844 RecordComponent* component = components->at(x); 1845 assert(component != nullptr, "unexpected null record component"); 1846 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1847 components_h->obj_at_put(x, component_oop); 1848 } 1849 return (jobjectArray)JNIHandles::make_local(THREAD, components_h()); 1850 } 1851 1852 return nullptr; 1853 } 1854 JVM_END 1855 1856 static bool select_method(const methodHandle& method, bool want_constructor) { 1857 if (want_constructor) { 1858 return (method->is_initializer() && !method->is_static()); 1859 } else { 1860 return (!method->is_initializer() && !method->is_overpass()); 1861 } 1862 } 1863 1864 static jobjectArray get_class_declared_methods_helper( 1865 JNIEnv *env, 1866 jclass ofClass, jboolean publicOnly, 1867 bool want_constructor, 1868 Klass* klass, TRAPS) { 1869 1870 JvmtiVMObjectAllocEventCollector oam; 1871 1872 oop ofMirror = JNIHandles::resolve_non_null(ofClass); 1873 // Exclude primitive types and array types 1874 if (java_lang_Class::is_primitive(ofMirror) 1875 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) { 1876 // Return empty array 1877 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1878 return (jobjectArray) JNIHandles::make_local(THREAD, res); 1879 } 1880 1881 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror)); 1882 1883 // Ensure class is linked 1884 k->link_class(CHECK_NULL); 1885 1886 Array<Method*>* methods = k->methods(); 1887 int methods_length = methods->length(); 1888 1889 // Save original method_idnum in case of redefinition, which can change 1890 // the idnum of obsolete methods. The new method will have the same idnum 1891 // but if we refresh the methods array, the counts will be wrong. 1892 ResourceMark rm(THREAD); 1893 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1894 int num_methods = 0; 1895 1896 for (int i = 0; i < methods_length; i++) { 1897 methodHandle method(THREAD, methods->at(i)); 1898 if (select_method(method, want_constructor)) { 1899 if (!publicOnly || method->is_public()) { 1900 idnums->push(method->method_idnum()); 1901 ++num_methods; 1902 } 1903 } 1904 } 1905 1906 // Allocate result 1907 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1908 objArrayHandle result (THREAD, r); 1909 1910 // Now just put the methods that we selected above, but go by their idnum 1911 // in case of redefinition. The methods can be redefined at any safepoint, 1912 // so above when allocating the oop array and below when creating reflect 1913 // objects. 1914 for (int i = 0; i < num_methods; i++) { 1915 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1916 if (method.is_null()) { 1917 // Method may have been deleted and seems this API can handle null 1918 // Otherwise should probably put a method that throws NSME 1919 result->obj_at_put(i, nullptr); 1920 } else { 1921 oop m; 1922 if (want_constructor) { 1923 m = Reflection::new_constructor(method, CHECK_NULL); 1924 } else { 1925 m = Reflection::new_method(method, false, CHECK_NULL); 1926 } 1927 result->obj_at_put(i, m); 1928 } 1929 } 1930 1931 return (jobjectArray) JNIHandles::make_local(THREAD, result()); 1932 } 1933 1934 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1935 { 1936 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1937 /*want_constructor*/ false, 1938 vmClasses::reflect_Method_klass(), THREAD); 1939 } 1940 JVM_END 1941 1942 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1943 { 1944 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1945 /*want_constructor*/ true, 1946 vmClasses::reflect_Constructor_klass(), THREAD); 1947 } 1948 JVM_END 1949 1950 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1951 { 1952 oop mirror = JNIHandles::resolve_non_null(cls); 1953 if (java_lang_Class::is_primitive(mirror)) { 1954 // Primitive type 1955 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1956 } 1957 1958 Klass* k = java_lang_Class::as_Klass(mirror); 1959 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1960 } 1961 JVM_END 1962 1963 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1964 { 1965 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1966 assert(c->is_instance_klass(), "must be"); 1967 InstanceKlass* ck = InstanceKlass::cast(c); 1968 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 1969 assert(m->is_instance_klass(), "must be"); 1970 InstanceKlass* mk = InstanceKlass::cast(m); 1971 return ck->has_nestmate_access_to(mk, THREAD); 1972 } 1973 JVM_END 1974 1975 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1976 { 1977 // current is not a primitive or array class 1978 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1979 assert(c->is_instance_klass(), "must be"); 1980 InstanceKlass* ck = InstanceKlass::cast(c); 1981 InstanceKlass* host = ck->nest_host(THREAD); 1982 return (jclass) (host == nullptr ? nullptr : 1983 JNIHandles::make_local(THREAD, host->java_mirror())); 1984 } 1985 JVM_END 1986 1987 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1988 { 1989 // current is not a primitive or array class 1990 ResourceMark rm(THREAD); 1991 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1992 assert(c->is_instance_klass(), "must be"); 1993 InstanceKlass* ck = InstanceKlass::cast(c); 1994 InstanceKlass* host = ck->nest_host(THREAD); 1995 1996 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 1997 ck->external_name(), host->external_name()); 1998 { 1999 JvmtiVMObjectAllocEventCollector oam; 2000 Array<u2>* members = host->nest_members(); 2001 int length = members == nullptr ? 0 : members->length(); 2002 2003 log_trace(class, nestmates)(" - host has %d listed nest members", length); 2004 2005 // nest host is first in the array so make it one bigger 2006 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2007 length + 1, CHECK_NULL); 2008 objArrayHandle result(THREAD, r); 2009 result->obj_at_put(0, host->java_mirror()); 2010 if (length != 0) { 2011 int count = 0; 2012 for (int i = 0; i < length; i++) { 2013 int cp_index = members->at(i); 2014 Klass* k = host->constants()->klass_at(cp_index, THREAD); 2015 if (HAS_PENDING_EXCEPTION) { 2016 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2017 return nullptr; // propagate VMEs 2018 } 2019 if (log_is_enabled(Trace, class, nestmates)) { 2020 stringStream ss; 2021 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2022 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2023 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2024 log_trace(class, nestmates)("%s", ss.as_string()); 2025 } 2026 CLEAR_PENDING_EXCEPTION; 2027 continue; 2028 } 2029 if (k->is_instance_klass()) { 2030 InstanceKlass* ik = InstanceKlass::cast(k); 2031 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2032 if (nest_host_k == host) { 2033 result->obj_at_put(count+1, k->java_mirror()); 2034 count++; 2035 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2036 } else { 2037 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2038 ik->external_name(), nest_host_k->external_name()); 2039 } 2040 } else { 2041 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2042 k->external_name()); 2043 } 2044 } 2045 if (count < length) { 2046 // we had invalid entries so we need to compact the array 2047 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2048 length + 1, count + 1); 2049 2050 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2051 count + 1, CHECK_NULL); 2052 objArrayHandle result2(THREAD, r2); 2053 for (int i = 0; i < count + 1; i++) { 2054 result2->obj_at_put(i, result->obj_at(i)); 2055 } 2056 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2057 } 2058 } 2059 else { 2060 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate"); 2061 } 2062 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2063 } 2064 } 2065 JVM_END 2066 2067 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2068 { 2069 oop mirror = JNIHandles::resolve_non_null(current); 2070 assert(!java_lang_Class::is_primitive(mirror), "should not be"); 2071 Klass* c = java_lang_Class::as_Klass(mirror); 2072 assert(c->is_instance_klass(), "must be"); 2073 InstanceKlass* ik = InstanceKlass::cast(c); 2074 ResourceMark rm(THREAD); 2075 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s", 2076 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name()); 2077 if (ik->is_sealed()) { 2078 JvmtiVMObjectAllocEventCollector oam; 2079 Array<u2>* subclasses = ik->permitted_subclasses(); 2080 int length = subclasses->length(); 2081 2082 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length); 2083 2084 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 2085 length, CHECK_NULL); 2086 objArrayHandle result(THREAD, r); 2087 int count = 0; 2088 for (int i = 0; i < length; i++) { 2089 int cp_index = subclasses->at(i); 2090 Klass* k = ik->constants()->klass_at(cp_index, THREAD); 2091 if (HAS_PENDING_EXCEPTION) { 2092 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 2093 return nullptr; // propagate VMEs 2094 } 2095 if (log_is_enabled(Trace, class, sealed)) { 2096 stringStream ss; 2097 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string(); 2098 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass); 2099 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2100 log_trace(class, sealed)("%s", ss.as_string()); 2101 } 2102 2103 CLEAR_PENDING_EXCEPTION; 2104 continue; 2105 } 2106 if (k->is_instance_klass()) { 2107 result->obj_at_put(count++, k->java_mirror()); 2108 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name()); 2109 } 2110 } 2111 if (count < length) { 2112 // we had invalid entries so we need to compact the array 2113 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(), 2114 count, CHECK_NULL); 2115 objArrayHandle result2(THREAD, r2); 2116 for (int i = 0; i < count; i++) { 2117 result2->obj_at_put(i, result->obj_at(i)); 2118 } 2119 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2120 } 2121 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2122 } else { 2123 return nullptr; 2124 } 2125 } 2126 JVM_END 2127 2128 // Constant pool access ////////////////////////////////////////////////////////// 2129 2130 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2131 { 2132 JvmtiVMObjectAllocEventCollector oam; 2133 oop mirror = JNIHandles::resolve_non_null(cls); 2134 // Return null for primitives and arrays 2135 if (!java_lang_Class::is_primitive(mirror)) { 2136 Klass* k = java_lang_Class::as_Klass(mirror); 2137 if (k->is_instance_klass()) { 2138 InstanceKlass* k_h = InstanceKlass::cast(k); 2139 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2140 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2141 return JNIHandles::make_local(THREAD, jcp()); 2142 } 2143 } 2144 return nullptr; 2145 } 2146 JVM_END 2147 2148 2149 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2150 { 2151 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2152 return cp->length(); 2153 } 2154 JVM_END 2155 2156 2157 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2158 { 2159 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2160 bounds_check(cp, index, CHECK_NULL); 2161 constantTag tag = cp->tag_at(index); 2162 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2163 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2164 } 2165 Klass* k = cp->klass_at(index, CHECK_NULL); 2166 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2167 } 2168 JVM_END 2169 2170 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2171 { 2172 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2173 bounds_check(cp, index, CHECK_NULL); 2174 constantTag tag = cp->tag_at(index); 2175 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2176 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2177 } 2178 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2179 if (k == nullptr) return nullptr; 2180 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror()); 2181 } 2182 JVM_END 2183 2184 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2185 constantTag tag = cp->tag_at(index); 2186 if (!tag.is_method() && !tag.is_interface_method()) { 2187 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2188 } 2189 int klass_ref = cp->uncached_klass_ref_index_at(index); 2190 Klass* k_o; 2191 if (force_resolution) { 2192 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2193 } else { 2194 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2195 if (k_o == nullptr) return nullptr; 2196 } 2197 InstanceKlass* k = InstanceKlass::cast(k_o); 2198 Symbol* name = cp->uncached_name_ref_at(index); 2199 Symbol* sig = cp->uncached_signature_ref_at(index); 2200 methodHandle m (THREAD, k->find_method(name, sig)); 2201 if (m.is_null()) { 2202 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2203 } 2204 oop method; 2205 if (!m->is_initializer() || m->is_static()) { 2206 method = Reflection::new_method(m, true, CHECK_NULL); 2207 } else { 2208 method = Reflection::new_constructor(m, CHECK_NULL); 2209 } 2210 return JNIHandles::make_local(THREAD, method); 2211 } 2212 2213 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2214 { 2215 JvmtiVMObjectAllocEventCollector oam; 2216 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2217 bounds_check(cp, index, CHECK_NULL); 2218 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2219 return res; 2220 } 2221 JVM_END 2222 2223 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2224 { 2225 JvmtiVMObjectAllocEventCollector oam; 2226 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2227 bounds_check(cp, index, CHECK_NULL); 2228 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2229 return res; 2230 } 2231 JVM_END 2232 2233 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2234 constantTag tag = cp->tag_at(index); 2235 if (!tag.is_field()) { 2236 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2237 } 2238 int klass_ref = cp->uncached_klass_ref_index_at(index); 2239 Klass* k_o; 2240 if (force_resolution) { 2241 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2242 } else { 2243 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2244 if (k_o == nullptr) return nullptr; 2245 } 2246 InstanceKlass* k = InstanceKlass::cast(k_o); 2247 Symbol* name = cp->uncached_name_ref_at(index); 2248 Symbol* sig = cp->uncached_signature_ref_at(index); 2249 fieldDescriptor fd; 2250 Klass* target_klass = k->find_field(name, sig, &fd); 2251 if (target_klass == nullptr) { 2252 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2253 } 2254 oop field = Reflection::new_field(&fd, CHECK_NULL); 2255 return JNIHandles::make_local(THREAD, field); 2256 } 2257 2258 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2259 { 2260 JvmtiVMObjectAllocEventCollector oam; 2261 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2262 bounds_check(cp, index, CHECK_NULL); 2263 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2264 return res; 2265 } 2266 JVM_END 2267 2268 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2269 { 2270 JvmtiVMObjectAllocEventCollector oam; 2271 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2272 bounds_check(cp, index, CHECK_NULL); 2273 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2274 return res; 2275 } 2276 JVM_END 2277 2278 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2279 { 2280 JvmtiVMObjectAllocEventCollector oam; 2281 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2282 bounds_check(cp, index, CHECK_NULL); 2283 constantTag tag = cp->tag_at(index); 2284 if (!tag.is_field_or_method()) { 2285 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2286 } 2287 int klass_ref = cp->uncached_klass_ref_index_at(index); 2288 Symbol* klass_name = cp->klass_name_at(klass_ref); 2289 Symbol* member_name = cp->uncached_name_ref_at(index); 2290 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2291 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL); 2292 objArrayHandle dest(THREAD, dest_o); 2293 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2294 dest->obj_at_put(0, str()); 2295 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2296 dest->obj_at_put(1, str()); 2297 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2298 dest->obj_at_put(2, str()); 2299 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2300 } 2301 JVM_END 2302 2303 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2304 { 2305 JvmtiVMObjectAllocEventCollector oam; 2306 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2307 bounds_check(cp, index, CHECK_0); 2308 constantTag tag = cp->tag_at(index); 2309 if (!tag.is_field_or_method()) { 2310 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2311 } 2312 return (jint) cp->uncached_klass_ref_index_at(index); 2313 } 2314 JVM_END 2315 2316 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2317 { 2318 JvmtiVMObjectAllocEventCollector oam; 2319 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2320 bounds_check(cp, index, CHECK_0); 2321 constantTag tag = cp->tag_at(index); 2322 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2323 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2324 } 2325 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2326 } 2327 JVM_END 2328 2329 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2330 { 2331 JvmtiVMObjectAllocEventCollector oam; 2332 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2333 bounds_check(cp, index, CHECK_NULL); 2334 constantTag tag = cp->tag_at(index); 2335 if (!tag.is_name_and_type()) { 2336 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2337 } 2338 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2339 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2340 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL); 2341 objArrayHandle dest(THREAD, dest_o); 2342 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2343 dest->obj_at_put(0, str()); 2344 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2345 dest->obj_at_put(1, str()); 2346 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 2347 } 2348 JVM_END 2349 2350 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2351 { 2352 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2353 bounds_check(cp, index, CHECK_0); 2354 constantTag tag = cp->tag_at(index); 2355 if (!tag.is_int()) { 2356 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2357 } 2358 return cp->int_at(index); 2359 } 2360 JVM_END 2361 2362 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2363 { 2364 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2365 bounds_check(cp, index, CHECK_(0L)); 2366 constantTag tag = cp->tag_at(index); 2367 if (!tag.is_long()) { 2368 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2369 } 2370 return cp->long_at(index); 2371 } 2372 JVM_END 2373 2374 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2375 { 2376 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2377 bounds_check(cp, index, CHECK_(0.0f)); 2378 constantTag tag = cp->tag_at(index); 2379 if (!tag.is_float()) { 2380 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2381 } 2382 return cp->float_at(index); 2383 } 2384 JVM_END 2385 2386 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2387 { 2388 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2389 bounds_check(cp, index, CHECK_(0.0)); 2390 constantTag tag = cp->tag_at(index); 2391 if (!tag.is_double()) { 2392 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2393 } 2394 return cp->double_at(index); 2395 } 2396 JVM_END 2397 2398 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2399 { 2400 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2401 bounds_check(cp, index, CHECK_NULL); 2402 constantTag tag = cp->tag_at(index); 2403 if (!tag.is_string()) { 2404 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2405 } 2406 oop str = cp->string_at(index, CHECK_NULL); 2407 return (jstring) JNIHandles::make_local(THREAD, str); 2408 } 2409 JVM_END 2410 2411 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2412 { 2413 JvmtiVMObjectAllocEventCollector oam; 2414 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2415 bounds_check(cp, index, CHECK_NULL); 2416 constantTag tag = cp->tag_at(index); 2417 if (!tag.is_symbol()) { 2418 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2419 } 2420 Symbol* sym = cp->symbol_at(index); 2421 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2422 return (jstring) JNIHandles::make_local(THREAD, str()); 2423 } 2424 JVM_END 2425 2426 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2427 { 2428 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2429 bounds_check(cp, index, CHECK_0); 2430 constantTag tag = cp->tag_at(index); 2431 jbyte result = tag.value(); 2432 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2433 // they are changed to the corresponding tags from the JVM spec, so that java code in 2434 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2435 if (tag.is_klass_or_reference()) { 2436 result = JVM_CONSTANT_Class; 2437 } else if (tag.is_string_index()) { 2438 result = JVM_CONSTANT_String; 2439 } else if (tag.is_method_type_in_error()) { 2440 result = JVM_CONSTANT_MethodType; 2441 } else if (tag.is_method_handle_in_error()) { 2442 result = JVM_CONSTANT_MethodHandle; 2443 } else if (tag.is_dynamic_constant_in_error()) { 2444 result = JVM_CONSTANT_Dynamic; 2445 } 2446 return result; 2447 } 2448 JVM_END 2449 2450 // Assertion support. ////////////////////////////////////////////////////////// 2451 2452 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2453 assert(cls != nullptr, "bad class"); 2454 2455 oop r = JNIHandles::resolve(cls); 2456 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2457 if (java_lang_Class::is_primitive(r)) return false; 2458 2459 Klass* k = java_lang_Class::as_Klass(r); 2460 assert(k->is_instance_klass(), "must be an instance klass"); 2461 if (!k->is_instance_klass()) return false; 2462 2463 ResourceMark rm(THREAD); 2464 const char* name = k->name()->as_C_string(); 2465 bool system_class = k->class_loader() == nullptr; 2466 return JavaAssertions::enabled(name, system_class); 2467 2468 JVM_END 2469 2470 2471 // Return a new AssertionStatusDirectives object with the fields filled in with 2472 // command-line assertion arguments (i.e., -ea, -da). 2473 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2474 JvmtiVMObjectAllocEventCollector oam; 2475 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2476 return JNIHandles::make_local(THREAD, asd); 2477 JVM_END 2478 2479 // Verification //////////////////////////////////////////////////////////////////////////////// 2480 2481 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2482 2483 // RedefineClasses support: bug 6214132 caused verification to fail. 2484 // All functions from this section should call the jvmtiThreadSate function: 2485 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2486 // The function returns a Klass* of the _scratch_class if the verifier 2487 // was invoked in the middle of the class redefinition. 2488 // Otherwise it returns its argument value which is the _the_class Klass*. 2489 // Please, refer to the description in the jvmtiThreadSate.hpp. 2490 2491 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2492 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2493 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2494 return k->name()->as_utf8(); 2495 JVM_END 2496 2497 2498 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2499 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2500 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2501 // types will have length zero if this is not an InstanceKlass 2502 // (length is determined by call to JVM_GetClassCPEntriesCount) 2503 if (k->is_instance_klass()) { 2504 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2505 for (int index = cp->length() - 1; index >= 0; index--) { 2506 constantTag tag = cp->tag_at(index); 2507 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2508 } 2509 } 2510 JVM_END 2511 2512 2513 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2514 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2515 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2516 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2517 JVM_END 2518 2519 2520 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2521 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2522 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2523 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2524 JVM_END 2525 2526 2527 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2528 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2529 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2530 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2531 JVM_END 2532 2533 2534 // The following methods, used for the verifier, are never called with 2535 // array klasses, so a direct cast to InstanceKlass is safe. 2536 // Typically, these methods are called in a loop with bounds determined 2537 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2538 // zero for arrays. 2539 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2540 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2541 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2542 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2543 int length = method->checked_exceptions_length(); 2544 if (length > 0) { 2545 CheckedExceptionElement* table= method->checked_exceptions_start(); 2546 for (int i = 0; i < length; i++) { 2547 exceptions[i] = table[i].class_cp_index; 2548 } 2549 } 2550 JVM_END 2551 2552 2553 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2554 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2555 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2556 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2557 return method->checked_exceptions_length(); 2558 JVM_END 2559 2560 2561 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2562 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2563 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2564 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2565 memcpy(code, method->code_base(), method->code_size()); 2566 JVM_END 2567 2568 2569 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2570 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2571 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2572 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2573 return method->code_size(); 2574 JVM_END 2575 2576 2577 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2578 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2579 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2580 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2581 ExceptionTable extable(method); 2582 entry->start_pc = extable.start_pc(entry_index); 2583 entry->end_pc = extable.end_pc(entry_index); 2584 entry->handler_pc = extable.handler_pc(entry_index); 2585 entry->catchType = extable.catch_type_index(entry_index); 2586 JVM_END 2587 2588 2589 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2590 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2591 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2592 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2593 return method->exception_table_length(); 2594 JVM_END 2595 2596 2597 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2598 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2599 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2600 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2601 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2602 JVM_END 2603 2604 2605 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2606 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2607 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2608 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2609 JVM_END 2610 2611 2612 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2613 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2614 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2615 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2616 return method->max_locals(); 2617 JVM_END 2618 2619 2620 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2621 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2622 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2623 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2624 return method->size_of_parameters(); 2625 JVM_END 2626 2627 2628 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2629 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2630 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2631 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2632 return method->verifier_max_stack(); 2633 JVM_END 2634 2635 2636 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2637 ResourceMark rm(THREAD); 2638 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2639 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2640 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2641 return method->name() == vmSymbols::object_initializer_name(); 2642 JVM_END 2643 2644 2645 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2646 ResourceMark rm(THREAD); 2647 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2648 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2649 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2650 return method->is_overpass(); 2651 JVM_END 2652 2653 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2654 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2655 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2656 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2657 return method->name()->as_utf8(); 2658 JVM_END 2659 2660 2661 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2662 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2663 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2664 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2665 return method->signature()->as_utf8(); 2666 JVM_END 2667 2668 /** 2669 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2670 * read entries in the constant pool. Since the old verifier always 2671 * works on a copy of the code, it will not see any rewriting that 2672 * may possibly occur in the middle of verification. So it is important 2673 * that nothing it calls tries to use the cpCache instead of the raw 2674 * constant pool, so we must use cp->uncached_x methods when appropriate. 2675 */ 2676 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2677 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2678 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2679 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2680 switch (cp->tag_at(cp_index).value()) { 2681 case JVM_CONSTANT_Fieldref: 2682 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2683 default: 2684 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2685 } 2686 ShouldNotReachHere(); 2687 return nullptr; 2688 JVM_END 2689 2690 2691 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2692 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2693 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2694 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2695 switch (cp->tag_at(cp_index).value()) { 2696 case JVM_CONSTANT_InterfaceMethodref: 2697 case JVM_CONSTANT_Methodref: 2698 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2699 default: 2700 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2701 } 2702 ShouldNotReachHere(); 2703 return nullptr; 2704 JVM_END 2705 2706 2707 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2708 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2709 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2710 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2711 switch (cp->tag_at(cp_index).value()) { 2712 case JVM_CONSTANT_InterfaceMethodref: 2713 case JVM_CONSTANT_Methodref: 2714 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2715 default: 2716 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2717 } 2718 ShouldNotReachHere(); 2719 return nullptr; 2720 JVM_END 2721 2722 2723 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2724 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2725 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2726 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2727 switch (cp->tag_at(cp_index).value()) { 2728 case JVM_CONSTANT_Fieldref: 2729 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2730 default: 2731 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2732 } 2733 ShouldNotReachHere(); 2734 return nullptr; 2735 JVM_END 2736 2737 2738 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2739 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2740 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2741 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2742 Symbol* classname = cp->klass_name_at(cp_index); 2743 return classname->as_utf8(); 2744 JVM_END 2745 2746 2747 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2748 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2749 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2750 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2751 switch (cp->tag_at(cp_index).value()) { 2752 case JVM_CONSTANT_Fieldref: { 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_GetCPFieldClassNameUTF: illegal constant"); 2759 } 2760 ShouldNotReachHere(); 2761 return nullptr; 2762 JVM_END 2763 2764 2765 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2766 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2767 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2768 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2769 switch (cp->tag_at(cp_index).value()) { 2770 case JVM_CONSTANT_Methodref: 2771 case JVM_CONSTANT_InterfaceMethodref: { 2772 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2773 Symbol* classname = cp->klass_name_at(class_index); 2774 return classname->as_utf8(); 2775 } 2776 default: 2777 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2778 } 2779 ShouldNotReachHere(); 2780 return nullptr; 2781 JVM_END 2782 2783 2784 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2785 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2786 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2787 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2788 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2789 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2790 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2791 switch (cp->tag_at(cp_index).value()) { 2792 case JVM_CONSTANT_Fieldref: { 2793 Symbol* name = cp->uncached_name_ref_at(cp_index); 2794 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2795 InstanceKlass* ik = InstanceKlass::cast(k_called); 2796 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2797 if (fs.name() == name && fs.signature() == signature) { 2798 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2799 } 2800 } 2801 return -1; 2802 } 2803 default: 2804 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2805 } 2806 ShouldNotReachHere(); 2807 return 0; 2808 JVM_END 2809 2810 2811 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2812 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2813 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2814 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2815 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2816 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2817 switch (cp->tag_at(cp_index).value()) { 2818 case JVM_CONSTANT_Methodref: 2819 case JVM_CONSTANT_InterfaceMethodref: { 2820 Symbol* name = cp->uncached_name_ref_at(cp_index); 2821 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2822 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2823 int methods_count = methods->length(); 2824 for (int i = 0; i < methods_count; i++) { 2825 Method* method = methods->at(i); 2826 if (method->name() == name && method->signature() == signature) { 2827 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2828 } 2829 } 2830 return -1; 2831 } 2832 default: 2833 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2834 } 2835 ShouldNotReachHere(); 2836 return 0; 2837 JVM_END 2838 2839 2840 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2841 2842 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2843 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2844 JVM_END 2845 2846 2847 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2848 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2849 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2850 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2851 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2852 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2853 JVM_END 2854 2855 // Printing support ////////////////////////////////////////////////// 2856 extern "C" { 2857 2858 ATTRIBUTE_PRINTF(3, 0) 2859 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2860 // Reject count values that are negative signed values converted to 2861 // unsigned; see bug 4399518, 4417214 2862 if ((intptr_t)count <= 0) return -1; 2863 2864 int result = os::vsnprintf(str, count, fmt, args); 2865 if (result > 0 && (size_t)result >= count) { 2866 result = -1; 2867 } 2868 2869 return result; 2870 } 2871 2872 ATTRIBUTE_PRINTF(3, 4) 2873 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2874 va_list args; 2875 int len; 2876 va_start(args, fmt); 2877 len = jio_vsnprintf(str, count, fmt, args); 2878 va_end(args); 2879 return len; 2880 } 2881 2882 ATTRIBUTE_PRINTF(2, 3) 2883 int jio_fprintf(FILE* f, const char *fmt, ...) { 2884 int len; 2885 va_list args; 2886 va_start(args, fmt); 2887 len = jio_vfprintf(f, fmt, args); 2888 va_end(args); 2889 return len; 2890 } 2891 2892 ATTRIBUTE_PRINTF(2, 0) 2893 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2894 if (Arguments::vfprintf_hook() != nullptr) { 2895 return Arguments::vfprintf_hook()(f, fmt, args); 2896 } else { 2897 return vfprintf(f, fmt, args); 2898 } 2899 } 2900 2901 ATTRIBUTE_PRINTF(1, 2) 2902 JNIEXPORT int jio_printf(const char *fmt, ...) { 2903 int len; 2904 va_list args; 2905 va_start(args, fmt); 2906 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2907 va_end(args); 2908 return len; 2909 } 2910 2911 // HotSpot specific jio method 2912 void jio_print(const char* s, size_t len) { 2913 // Try to make this function as atomic as possible. 2914 if (Arguments::vfprintf_hook() != nullptr) { 2915 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2916 } else { 2917 // Make an unused local variable to avoid warning from gcc compiler. 2918 bool dummy = os::write(defaultStream::output_fd(), s, len); 2919 } 2920 } 2921 2922 } // Extern C 2923 2924 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2925 2926 // In most of the JVM thread support functions we need to access the 2927 // thread through a ThreadsListHandle to prevent it from exiting and 2928 // being reclaimed while we try to operate on it. The exceptions to this 2929 // rule are when operating on the current thread, or if the monitor of 2930 // the target java.lang.Thread is locked at the Java level - in both 2931 // cases the target cannot exit. 2932 2933 static void thread_entry(JavaThread* thread, TRAPS) { 2934 HandleMark hm(THREAD); 2935 Handle obj(THREAD, thread->threadObj()); 2936 JavaValue result(T_VOID); 2937 JavaCalls::call_virtual(&result, 2938 obj, 2939 vmClasses::Thread_klass(), 2940 vmSymbols::run_method_name(), 2941 vmSymbols::void_method_signature(), 2942 THREAD); 2943 } 2944 2945 2946 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2947 #if INCLUDE_CDS 2948 if (CDSConfig::is_dumping_static_archive()) { 2949 // During java -Xshare:dump, if we allow multiple Java threads to 2950 // execute in parallel, symbols and classes may be loaded in 2951 // random orders which will make the resulting CDS archive 2952 // non-deterministic. 2953 // 2954 // Lucikly, during java -Xshare:dump, it's important to run only 2955 // the code in the main Java thread (which is NOT started here) that 2956 // creates the module graph, etc. It's safe to not start the other 2957 // threads which are launched by class static initializers 2958 // (ReferenceHandler, FinalizerThread and CleanerImpl). 2959 if (log_is_enabled(Info, cds)) { 2960 ResourceMark rm; 2961 oop t = JNIHandles::resolve_non_null(jthread); 2962 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name()); 2963 } 2964 return; 2965 } 2966 #endif 2967 JavaThread *native_thread = nullptr; 2968 2969 // We cannot hold the Threads_lock when we throw an exception, 2970 // due to rank ordering issues. Example: we might need to grab the 2971 // Heap_lock while we construct the exception. 2972 bool throw_illegal_thread_state = false; 2973 2974 // We must release the Threads_lock before we can post a jvmti event 2975 // in Thread::start. 2976 { 2977 // Ensure that the C++ Thread and OSThread structures aren't freed before 2978 // we operate. 2979 MutexLocker mu(Threads_lock); 2980 2981 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2982 // re-starting an already started thread, so we should usually find 2983 // that the JavaThread is null. However for a JNI attached thread 2984 // there is a small window between the Thread object being created 2985 // (with its JavaThread set) and the update to its threadStatus, so we 2986 // have to check for this 2987 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) { 2988 throw_illegal_thread_state = true; 2989 } else { 2990 jlong size = 2991 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2992 // Allocate the C++ Thread structure and create the native thread. The 2993 // stack size retrieved from java is 64-bit signed, but the constructor takes 2994 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2995 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2996 // - Avoid passing negative values which would result in really large stacks. 2997 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2998 size_t sz = size > 0 ? (size_t) size : 0; 2999 native_thread = new JavaThread(&thread_entry, sz); 3000 3001 // At this point it may be possible that no osthread was created for the 3002 // JavaThread due to lack of memory. Check for this situation and throw 3003 // an exception if necessary. Eventually we may want to change this so 3004 // that we only grab the lock if the thread was created successfully - 3005 // then we can also do this check and throw the exception in the 3006 // JavaThread constructor. 3007 if (native_thread->osthread() != nullptr) { 3008 // Note: the current thread is not being used within "prepare". 3009 native_thread->prepare(jthread); 3010 } 3011 } 3012 } 3013 3014 if (throw_illegal_thread_state) { 3015 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3016 } 3017 3018 assert(native_thread != nullptr, "Starting null thread?"); 3019 3020 if (native_thread->osthread() == nullptr) { 3021 ResourceMark rm(thread); 3022 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"", 3023 JavaThread::name_for(JNIHandles::resolve_non_null(jthread))); 3024 // No one should hold a reference to the 'native_thread'. 3025 native_thread->smr_delete(); 3026 if (JvmtiExport::should_post_resource_exhausted()) { 3027 JvmtiExport::post_resource_exhausted( 3028 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3029 os::native_thread_creation_failed_msg()); 3030 } 3031 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3032 os::native_thread_creation_failed_msg()); 3033 } 3034 3035 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);) 3036 3037 Thread::start(native_thread); 3038 3039 JVM_END 3040 3041 3042 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3043 ThreadsListHandle tlh(thread); 3044 oop java_thread = nullptr; 3045 JavaThread* receiver = nullptr; 3046 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3047 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3048 3049 if (is_alive) { 3050 // jthread refers to a live JavaThread. 3051 Thread::set_priority(receiver, (ThreadPriority)prio); 3052 } 3053 // Implied else: If the JavaThread hasn't started yet, then the 3054 // priority set in the java.lang.Thread object above will be pushed 3055 // down when it does start. 3056 JVM_END 3057 3058 3059 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3060 if (os::dont_yield()) return; 3061 HOTSPOT_THREAD_YIELD(); 3062 os::naked_yield(); 3063 JVM_END 3064 3065 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos)) 3066 if (nanos < 0) { 3067 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range"); 3068 } 3069 3070 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3071 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3072 } 3073 3074 // Save current thread state and restore it at the end of this block. 3075 // And set new thread state to SLEEPING. 3076 JavaThreadSleepState jtss(thread); 3077 3078 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC); 3079 3080 if (nanos == 0) { 3081 os::naked_yield(); 3082 } else { 3083 ThreadState old_state = thread->osthread()->get_state(); 3084 thread->osthread()->set_state(SLEEPING); 3085 if (!thread->sleep_nanos(nanos)) { // interrupted 3086 // An asynchronous exception could have been thrown on 3087 // us while we were sleeping. We do not overwrite those. 3088 if (!HAS_PENDING_EXCEPTION) { 3089 HOTSPOT_THREAD_SLEEP_END(1); 3090 3091 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3092 // to properly restore the thread state. That's likely wrong. 3093 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3094 } 3095 } 3096 thread->osthread()->set_state(old_state); 3097 } 3098 HOTSPOT_THREAD_SLEEP_END(0); 3099 JVM_END 3100 3101 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass)) 3102 oop jthread = thread->threadObj(); 3103 assert(jthread != nullptr, "no current carrier thread!"); 3104 return JNIHandles::make_local(THREAD, jthread); 3105 JVM_END 3106 3107 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3108 oop theThread = thread->vthread(); 3109 assert(theThread != (oop)nullptr, "no current thread!"); 3110 return JNIHandles::make_local(THREAD, theThread); 3111 JVM_END 3112 3113 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread, 3114 jobject theThread)) 3115 oop threadObj = JNIHandles::resolve(theThread); 3116 thread->set_vthread(threadObj); 3117 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);) 3118 JVM_END 3119 3120 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass)) 3121 return ThreadIdentifier::unsafe_offset(); 3122 JVM_END 3123 3124 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3125 ThreadsListHandle tlh(thread); 3126 JavaThread* receiver = nullptr; 3127 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr); 3128 if (is_alive) { 3129 // jthread refers to a live JavaThread. 3130 receiver->interrupt(); 3131 } 3132 JVM_END 3133 3134 // Return true iff the current thread has locked the object passed in 3135 3136 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3137 if (obj == nullptr) { 3138 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3139 } 3140 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3141 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj); 3142 JVM_END 3143 3144 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread)) 3145 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD); 3146 return JNIHandles::make_local(THREAD, trace); 3147 JVM_END 3148 3149 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3150 VM_PrintThreads op; 3151 VMThread::execute(&op); 3152 if (JvmtiExport::should_post_data_dump()) { 3153 JvmtiExport::post_data_dump(); 3154 } 3155 JVM_END 3156 3157 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3158 // We don't use a ThreadsListHandle here because the current thread 3159 // must be alive. 3160 oop java_thread = JNIHandles::resolve_non_null(jthread); 3161 JavaThread* thr = java_lang_Thread::thread(java_thread); 3162 if (thread == thr && !thr->has_attached_via_jni()) { 3163 // Thread naming is only supported for the current thread and 3164 // we don't set the name of an attached thread to avoid stepping 3165 // on other programs. 3166 ResourceMark rm(thread); 3167 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3168 os::set_native_thread_name(thread_name); 3169 } 3170 JVM_END 3171 3172 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass)) 3173 oop theCache = thread->scopedValueCache(); 3174 return JNIHandles::make_local(THREAD, theCache); 3175 JVM_END 3176 3177 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass, 3178 jobject theCache)) 3179 arrayOop objs = arrayOop(JNIHandles::resolve(theCache)); 3180 thread->set_scopedValueCache(objs); 3181 JVM_END 3182 3183 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3184 3185 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3186 ResourceMark rm(THREAD); 3187 JvmtiVMObjectAllocEventCollector oam; 3188 vframeStream vfst(thread); 3189 3190 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) { 3191 // This must only be called from SecurityManager.getClassContext 3192 Method* m = vfst.method(); 3193 if (!(m->method_holder() == vmClasses::SecurityManager_klass() && 3194 m->name() == vmSymbols::getClassContext_name() && 3195 m->signature() == vmSymbols::void_class_array_signature())) { 3196 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3197 } 3198 } 3199 3200 // Collect method holders 3201 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3202 for (; !vfst.at_end(); vfst.security_next()) { 3203 Method* m = vfst.method(); 3204 // Native frames are not returned 3205 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3206 Klass* holder = m->method_holder(); 3207 assert(holder->is_klass(), "just checking"); 3208 klass_array->append(holder); 3209 } 3210 } 3211 3212 // Create result array of type [Ljava/lang/Class; 3213 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL); 3214 // Fill in mirrors corresponding to method holders 3215 for (int i = 0; i < klass_array->length(); i++) { 3216 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3217 } 3218 3219 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3220 JVM_END 3221 3222 3223 // java.lang.Package //////////////////////////////////////////////////////////////// 3224 3225 3226 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3227 ResourceMark rm(THREAD); 3228 JvmtiVMObjectAllocEventCollector oam; 3229 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3230 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3231 return (jstring) JNIHandles::make_local(THREAD, result); 3232 JVM_END 3233 3234 3235 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3236 JvmtiVMObjectAllocEventCollector oam; 3237 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3238 return (jobjectArray) JNIHandles::make_local(THREAD, result); 3239 JVM_END 3240 3241 3242 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3243 3244 3245 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3246 MonitorLocker ml(Heap_lock); 3247 oop ref = Universe::reference_pending_list(); 3248 if (ref != nullptr) { 3249 Universe::clear_reference_pending_list(); 3250 } 3251 return JNIHandles::make_local(THREAD, ref); 3252 JVM_END 3253 3254 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3255 MonitorLocker ml(Heap_lock); 3256 return Universe::has_reference_pending_list(); 3257 JVM_END 3258 3259 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3260 MonitorLocker ml(Heap_lock); 3261 while (!Universe::has_reference_pending_list()) { 3262 ml.wait(); 3263 } 3264 JVM_END 3265 3266 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3267 oop ref_oop = JNIHandles::resolve_non_null(ref); 3268 // PhantomReference has it's own implementation of refersTo(). 3269 // See: JVM_PhantomReferenceRefersTo 3270 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition"); 3271 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop); 3272 return referent == JNIHandles::resolve(o); 3273 JVM_END 3274 3275 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref)) 3276 oop ref_oop = JNIHandles::resolve_non_null(ref); 3277 // FinalReference has it's own implementation of clear(). 3278 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition"); 3279 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) { 3280 // If the referent has already been cleared then done. 3281 // However, if the referent is dead but has not yet been cleared by 3282 // concurrent reference processing, it should NOT be cleared here. 3283 // Instead, clearing should be left to the GC. Clearing it here could 3284 // detectably lose an expected notification, which is impossible with 3285 // STW reference processing. The clearing in enqueue() doesn't have 3286 // this problem, since the enqueue covers the notification, but it's not 3287 // worth the effort to handle that case specially. 3288 return; 3289 } 3290 java_lang_ref_Reference::clear_referent(ref_oop); 3291 JVM_END 3292 3293 3294 // java.lang.ref.PhantomReference ////////////////////////////////////////////////// 3295 3296 3297 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o)) 3298 oop ref_oop = JNIHandles::resolve_non_null(ref); 3299 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop); 3300 return referent == JNIHandles::resolve(o); 3301 JVM_END 3302 3303 3304 // ObjectInputStream /////////////////////////////////////////////////////////////// 3305 3306 // Return the first user-defined class loader up the execution stack, or null 3307 // if only code from the bootstrap or platform class loader is on the stack. 3308 3309 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3310 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3311 InstanceKlass* ik = vfst.method()->method_holder(); 3312 oop loader = ik->class_loader(); 3313 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) { 3314 // Skip reflection related frames 3315 if (!ik->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) { 3316 return JNIHandles::make_local(THREAD, loader); 3317 } 3318 } 3319 } 3320 return nullptr; 3321 JVM_END 3322 3323 3324 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3325 3326 3327 // resolve array handle and check arguments 3328 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3329 if (arr == nullptr) { 3330 THROW_0(vmSymbols::java_lang_NullPointerException()); 3331 } 3332 oop a = JNIHandles::resolve_non_null(arr); 3333 if (!a->is_array()) { 3334 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3335 } else if (type_array_only && !a->is_typeArray()) { 3336 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3337 } 3338 return arrayOop(a); 3339 } 3340 3341 3342 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3343 arrayOop a = check_array(env, arr, false, CHECK_0); 3344 return a->length(); 3345 JVM_END 3346 3347 3348 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3349 JvmtiVMObjectAllocEventCollector oam; 3350 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3351 jvalue value; 3352 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3353 oop box = Reflection::box(&value, type, CHECK_NULL); 3354 return JNIHandles::make_local(THREAD, box); 3355 JVM_END 3356 3357 3358 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3359 jvalue value; 3360 value.i = 0; // to initialize value before getting used in CHECK 3361 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3362 assert(a->is_typeArray(), "just checking"); 3363 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3364 BasicType wide_type = (BasicType) wCode; 3365 if (type != wide_type) { 3366 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3367 } 3368 return value; 3369 JVM_END 3370 3371 3372 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3373 arrayOop a = check_array(env, arr, false, CHECK); 3374 oop box = JNIHandles::resolve(val); 3375 jvalue value; 3376 value.i = 0; // to initialize value before getting used in CHECK 3377 BasicType value_type; 3378 if (a->is_objArray()) { 3379 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3380 value_type = Reflection::unbox_for_regular_object(box, &value); 3381 } else { 3382 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3383 } 3384 Reflection::array_set(&value, a, index, value_type, CHECK); 3385 JVM_END 3386 3387 3388 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3389 arrayOop a = check_array(env, arr, true, CHECK); 3390 assert(a->is_typeArray(), "just checking"); 3391 BasicType value_type = (BasicType) vCode; 3392 Reflection::array_set(&v, a, index, value_type, CHECK); 3393 JVM_END 3394 3395 3396 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3397 JvmtiVMObjectAllocEventCollector oam; 3398 oop element_mirror = JNIHandles::resolve(eltClass); 3399 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3400 return JNIHandles::make_local(THREAD, result); 3401 JVM_END 3402 3403 3404 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3405 JvmtiVMObjectAllocEventCollector oam; 3406 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3407 oop element_mirror = JNIHandles::resolve(eltClass); 3408 assert(dim_array->is_typeArray(), "just checking"); 3409 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3410 return JNIHandles::make_local(THREAD, result); 3411 JVM_END 3412 3413 3414 // Library support /////////////////////////////////////////////////////////////////////////// 3415 3416 JVM_LEAF(void*, JVM_LoadZipLibrary()) 3417 return ZipLibrary::handle(); 3418 JVM_END 3419 3420 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException)) 3421 //%note jvm_ct 3422 char ebuf[1024]; 3423 void *load_result; 3424 { 3425 ThreadToNativeFromVM ttnfvm(thread); 3426 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3427 } 3428 if (load_result == nullptr) { 3429 if (throwException) { 3430 char msg[1024]; 3431 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3432 // Since 'ebuf' may contain a string encoded using 3433 // platform encoding scheme, we need to pass 3434 // Exceptions::unsafe_to_utf8 to the new_exception method 3435 // as the last argument. See bug 6367357. 3436 Handle h_exception = 3437 Exceptions::new_exception(thread, 3438 vmSymbols::java_lang_UnsatisfiedLinkError(), 3439 msg, Exceptions::unsafe_to_utf8); 3440 3441 THROW_HANDLE_0(h_exception); 3442 } else { 3443 log_info(library)("Failed to load library %s", name); 3444 return load_result; 3445 } 3446 } 3447 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3448 return load_result; 3449 JVM_END 3450 3451 3452 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3453 os::dll_unload(handle); 3454 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3455 JVM_END 3456 3457 3458 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3459 void* find_result = os::dll_lookup(handle, name); 3460 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3461 find_result != nullptr ? "Found" : "Failed to find", 3462 name, p2i(handle)); 3463 return find_result; 3464 JVM_END 3465 3466 3467 // JNI version /////////////////////////////////////////////////////////////////////////////// 3468 3469 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3470 return Threads::is_supported_jni_version_including_1_1(version); 3471 JVM_END 3472 3473 3474 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void)) 3475 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE; 3476 JVM_END 3477 3478 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void)) 3479 return VMContinuations ? JNI_TRUE : JNI_FALSE; 3480 JVM_END 3481 3482 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void)) 3483 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE; 3484 JVM_END 3485 3486 // String support /////////////////////////////////////////////////////////////////////////// 3487 3488 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3489 JvmtiVMObjectAllocEventCollector oam; 3490 if (str == nullptr) return nullptr; 3491 oop string = JNIHandles::resolve_non_null(str); 3492 oop result = StringTable::intern(string, CHECK_NULL); 3493 return (jstring) JNIHandles::make_local(THREAD, result); 3494 JVM_END 3495 3496 3497 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3498 3499 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3500 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3501 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3502 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3503 // nature. JavaThreads will be "in native" when using this API from JDK code. 3504 3505 3506 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3507 VM_Exit::block_if_vm_exited(); 3508 return new PlatformMutex(); 3509 } 3510 3511 3512 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3513 VM_Exit::block_if_vm_exited(); 3514 delete ((PlatformMutex*) mon); 3515 } 3516 3517 3518 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3519 VM_Exit::block_if_vm_exited(); 3520 ((PlatformMutex*) mon)->lock(); 3521 return 0; 3522 } 3523 3524 3525 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3526 VM_Exit::block_if_vm_exited(); 3527 ((PlatformMutex*) mon)->unlock(); 3528 } 3529 3530 3531 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3532 3533 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3534 Handle loader, Handle protection_domain, 3535 jboolean throwError, TRAPS) { 3536 // Security Note: 3537 // The Java level wrapper will perform the necessary security check allowing 3538 // us to pass the null as the initiating class loader. The VM is responsible for 3539 // the checkPackageAccess relative to the initiating class loader via the 3540 // protection_domain. The protection_domain is passed as null by the java code 3541 // if there is no security manager in 3-arg Class.forName(). 3542 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3543 3544 // Check if we should initialize the class 3545 if (init && klass->is_instance_klass()) { 3546 klass->initialize(CHECK_NULL); 3547 } 3548 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror()); 3549 } 3550 3551 3552 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3553 3554 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3555 Handle method_handle; 3556 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3557 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3558 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3559 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3560 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3561 jobject res = JNIHandles::make_local(THREAD, result); 3562 if (JvmtiExport::should_post_vm_object_alloc()) { 3563 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3564 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!"); 3565 if (java_lang_Class::is_primitive(ret_type)) { 3566 // Only for primitive type vm allocates memory for java object. 3567 // See box() method. 3568 JvmtiExport::post_vm_object_alloc(thread, result); 3569 } 3570 } 3571 return res; 3572 } else { 3573 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3574 } 3575 JVM_END 3576 3577 3578 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3579 oop constructor_mirror = JNIHandles::resolve(c); 3580 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3581 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3582 jobject res = JNIHandles::make_local(THREAD, result); 3583 if (JvmtiExport::should_post_vm_object_alloc()) { 3584 JvmtiExport::post_vm_object_alloc(thread, result); 3585 } 3586 return res; 3587 JVM_END 3588 3589 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3590 3591 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3592 return VM_Version::supports_cx8(); 3593 JVM_END 3594 3595 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3596 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3597 assert(k->is_klass(), "just checking"); 3598 HeapShared::initialize_from_archived_subgraph(THREAD, k); 3599 JVM_END 3600 3601 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3602 jclass caller, 3603 jstring interfaceMethodName, 3604 jobject factoryType, 3605 jobject interfaceMethodType, 3606 jobject implementationMember, 3607 jobject dynamicMethodType, 3608 jclass lambdaProxyClass)) 3609 #if INCLUDE_CDS 3610 if (!CDSConfig::is_dumping_archive()) { 3611 return; 3612 } 3613 3614 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3615 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3616 if (caller_ik->is_hidden()) { 3617 // Hidden classes not of type lambda proxy classes are currently not being archived. 3618 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3619 // registered for archiving. 3620 return; 3621 } 3622 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass)); 3623 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k); 3624 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3625 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3626 3627 Symbol* interface_method_name = nullptr; 3628 if (interfaceMethodName != nullptr) { 3629 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3630 } 3631 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3632 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3633 3634 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3635 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3636 3637 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3638 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3639 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3640 3641 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3642 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3643 3644 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type, 3645 interface_method_type, m, dynamic_method_type, THREAD); 3646 #endif // INCLUDE_CDS 3647 JVM_END 3648 3649 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3650 jclass caller, 3651 jstring interfaceMethodName, 3652 jobject factoryType, 3653 jobject interfaceMethodType, 3654 jobject implementationMember, 3655 jobject dynamicMethodType)) 3656 #if INCLUDE_CDS 3657 3658 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr || 3659 implementationMember == nullptr || dynamicMethodType == nullptr) { 3660 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr); 3661 } 3662 3663 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3664 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3665 if (!caller_ik->is_shared()) { 3666 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3667 return nullptr; 3668 } 3669 3670 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName)); 3671 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType)); 3672 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true); 3673 3674 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType)); 3675 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true); 3676 3677 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember)); 3678 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be"); 3679 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop()); 3680 3681 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType)); 3682 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true); 3683 3684 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type, 3685 interface_method_type, m, dynamic_method_type); 3686 jclass jcls = nullptr; 3687 if (lambda_ik != nullptr) { 3688 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD); 3689 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror()); 3690 } 3691 return jcls; 3692 #else 3693 return nullptr; 3694 #endif // INCLUDE_CDS 3695 JVM_END 3696 3697 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env)) 3698 return CDSConfig::is_dumping_archive(); 3699 JVM_END 3700 3701 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env)) 3702 return UseSharedSpaces; 3703 JVM_END 3704 3705 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping()) 3706 if (CDSConfig::is_dumping_static_archive()) { 3707 // We do this so that the default CDS archive can be deterministic. 3708 const char* release = VM_Version::vm_release(); 3709 const char* dbg_level = VM_Version::jdk_debug_level(); 3710 const char* version = VM_Version::internal_vm_info_string(); 3711 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3712 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3713 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3714 seed += (jlong)VM_Version::vm_major_version(); 3715 seed += (jlong)VM_Version::vm_minor_version(); 3716 seed += (jlong)VM_Version::vm_security_version(); 3717 seed += (jlong)VM_Version::vm_patch_version(); 3718 if (seed == 0) { // don't let this ever be zero. 3719 seed = 0x87654321; 3720 } 3721 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed); 3722 return seed; 3723 } else { 3724 return 0; 3725 } 3726 JVM_END 3727 3728 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env)) 3729 #if INCLUDE_CDS 3730 return ClassListWriter::is_enabled() || CDSConfig::is_dumping_dynamic_archive(); 3731 #else 3732 return false; 3733 #endif // INCLUDE_CDS 3734 JVM_END 3735 3736 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line)) 3737 #if INCLUDE_CDS 3738 assert(ClassListWriter::is_enabled() || CDSConfig::is_dumping_dynamic_archive(), "Should be set and open or do dynamic dump"); 3739 if (line != nullptr) { 3740 ResourceMark rm(THREAD); 3741 Handle h_line (THREAD, JNIHandles::resolve_non_null(line)); 3742 char* c_line = java_lang_String::as_utf8_string(h_line()); 3743 if (CDSConfig::is_dumping_dynamic_archive()) { 3744 // Note: LambdaFormInvokers::append take same format which is not 3745 // same as below the print format. The line does not include LAMBDA_FORM_TAG. 3746 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal)); 3747 } 3748 if (ClassListWriter::is_enabled()) { 3749 ClassListWriter w; 3750 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line); 3751 } 3752 } 3753 #endif // INCLUDE_CDS 3754 JVM_END 3755 3756 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName)) 3757 #if INCLUDE_CDS 3758 ResourceMark rm(THREAD); 3759 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName)); 3760 char* file_name = java_lang_String::as_utf8_string(file_handle()); 3761 MetaspaceShared::dump_loaded_classes(file_name, THREAD); 3762 #endif // INCLUDE_CDS 3763 JVM_END 3764 3765 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName)) 3766 #if INCLUDE_CDS 3767 ResourceMark rm(THREAD); 3768 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName)); 3769 char* archive_name = java_lang_String::as_utf8_string(file_handle()); 3770 DynamicArchive::dump_for_jcmd(archive_name, CHECK); 3771 #endif // INCLUDE_CDS 3772 JVM_END 3773 3774 // Returns an array of all live Thread objects (VM internal JavaThreads, 3775 // jvmti agent threads, and JNI attaching threads are skipped) 3776 // See CR 6404306 regarding JNI attaching threads 3777 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3778 ResourceMark rm(THREAD); 3779 ThreadsListEnumerator tle(THREAD, false, false); 3780 JvmtiVMObjectAllocEventCollector oam; 3781 3782 int num_threads = tle.num_threads(); 3783 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL); 3784 objArrayHandle threads_ah(THREAD, r); 3785 3786 for (int i = 0; i < num_threads; i++) { 3787 Handle h = tle.get_threadObj(i); 3788 threads_ah->obj_at_put(i, h()); 3789 } 3790 3791 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah()); 3792 JVM_END 3793 3794 3795 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3796 // Return StackTraceElement[][], each element is the stack trace of a thread in 3797 // the corresponding entry in the given threads array 3798 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3799 JvmtiVMObjectAllocEventCollector oam; 3800 3801 // Check if threads is null 3802 if (threads == nullptr) { 3803 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3804 } 3805 3806 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3807 objArrayHandle ah(THREAD, a); 3808 int num_threads = ah->length(); 3809 // check if threads is non-empty array 3810 if (num_threads == 0) { 3811 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3812 } 3813 3814 // check if threads is not an array of objects of Thread class 3815 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3816 if (k != vmClasses::Thread_klass()) { 3817 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3818 } 3819 3820 ResourceMark rm(THREAD); 3821 3822 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3823 for (int i = 0; i < num_threads; i++) { 3824 oop thread_obj = ah->obj_at(i); 3825 instanceHandle h(THREAD, (instanceOop) thread_obj); 3826 thread_handle_array->append(h); 3827 } 3828 3829 // The JavaThread references in thread_handle_array are validated 3830 // in VM_ThreadDump::doit(). 3831 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3832 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces()); 3833 3834 JVM_END 3835 3836 // JVM monitoring and management support 3837 JVM_LEAF(void*, JVM_GetManagement(jint version)) 3838 return Management::get_jmm_interface(version); 3839 JVM_END 3840 3841 // com.sun.tools.attach.VirtualMachine agent properties support 3842 // 3843 // Initialize the agent properties with the properties maintained in the VM 3844 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3845 ResourceMark rm; 3846 3847 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3848 3849 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3850 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3851 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3852 return properties; 3853 JVM_END 3854 3855 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3856 { 3857 JvmtiVMObjectAllocEventCollector oam; 3858 3859 if (ofClass == nullptr) { 3860 return nullptr; 3861 } 3862 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3863 // Special handling for primitive objects 3864 if (java_lang_Class::is_primitive(mirror())) { 3865 return nullptr; 3866 } 3867 Klass* k = java_lang_Class::as_Klass(mirror()); 3868 if (!k->is_instance_klass()) { 3869 return nullptr; 3870 } 3871 InstanceKlass* ik = InstanceKlass::cast(k); 3872 int encl_method_class_idx = ik->enclosing_method_class_index(); 3873 if (encl_method_class_idx == 0) { 3874 return nullptr; 3875 } 3876 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL); 3877 objArrayHandle dest(THREAD, dest_o); 3878 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3879 dest->obj_at_put(0, enc_k->java_mirror()); 3880 int encl_method_method_idx = ik->enclosing_method_method_index(); 3881 if (encl_method_method_idx != 0) { 3882 Symbol* sym = ik->constants()->symbol_at( 3883 extract_low_short_from_int( 3884 ik->constants()->name_and_type_at(encl_method_method_idx))); 3885 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3886 dest->obj_at_put(1, str()); 3887 sym = ik->constants()->symbol_at( 3888 extract_high_short_from_int( 3889 ik->constants()->name_and_type_at(encl_method_method_idx))); 3890 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3891 dest->obj_at_put(2, str()); 3892 } 3893 return (jobjectArray) JNIHandles::make_local(THREAD, dest()); 3894 } 3895 JVM_END 3896 3897 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3898 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3899 ResourceMark rm(THREAD); 3900 3901 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3902 return nullptr; 3903 } 3904 3905 char** vm_flags = Arguments::jvm_flags_array(); 3906 char** vm_args = Arguments::jvm_args_array(); 3907 int num_flags = Arguments::num_jvm_flags(); 3908 int num_args = Arguments::num_jvm_args(); 3909 3910 InstanceKlass* ik = vmClasses::String_klass(); 3911 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3912 objArrayHandle result_h(THREAD, r); 3913 3914 int index = 0; 3915 for (int j = 0; j < num_flags; j++, index++) { 3916 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3917 result_h->obj_at_put(index, h()); 3918 } 3919 for (int i = 0; i < num_args; i++, index++) { 3920 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3921 result_h->obj_at_put(index, h()); 3922 } 3923 return (jobjectArray) JNIHandles::make_local(THREAD, result_h()); 3924 JVM_END 3925 3926 JVM_LEAF(jint, JVM_FindSignal(const char *name)) 3927 return os::get_signal_number(name); 3928 JVM_END 3929 3930 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread)) 3931 #if INCLUDE_JVMTI 3932 if (!DoJVMTIVirtualThreadTransitions) { 3933 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3934 return; 3935 } 3936 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3937 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread); 3938 } else { 3939 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3940 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false); 3941 } 3942 #else 3943 fatal("Should only be called with JVMTI enabled"); 3944 #endif 3945 JVM_END 3946 3947 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread)) 3948 #if INCLUDE_JVMTI 3949 if (!DoJVMTIVirtualThreadTransitions) { 3950 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3951 return; 3952 } 3953 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3954 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread); 3955 } else { 3956 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3957 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true); 3958 } 3959 #else 3960 fatal("Should only be called with JVMTI enabled"); 3961 #endif 3962 JVM_END 3963 3964 // If notifications are disabled then just update the VTMS transition bit and return. 3965 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call. 3966 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide)) 3967 #if INCLUDE_JVMTI 3968 if (!DoJVMTIVirtualThreadTransitions) { 3969 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3970 return; 3971 } 3972 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3973 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide); 3974 } else { 3975 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3976 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 3977 } 3978 #else 3979 fatal("Should only be called with JVMTI enabled"); 3980 #endif 3981 JVM_END 3982 3983 // If notifications are disabled then just update the VTMS transition bit and return. 3984 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below. 3985 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide)) 3986 #if INCLUDE_JVMTI 3987 if (!DoJVMTIVirtualThreadTransitions) { 3988 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 3989 return; 3990 } 3991 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) { 3992 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide); 3993 } else { 3994 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object 3995 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide); 3996 } 3997 #else 3998 fatal("Should only be called with JVMTI enabled"); 3999 #endif 4000 JVM_END 4001 4002 // Always update the temporary VTMS transition bit. 4003 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jobject vthread, jboolean hide)) 4004 #if INCLUDE_JVMTI 4005 if (!DoJVMTIVirtualThreadTransitions) { 4006 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check"); 4007 return; 4008 } 4009 assert(!thread->is_in_VTMS_transition(), "sanity check"); 4010 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check"); 4011 thread->toggle_is_in_tmp_VTMS_transition(); 4012 #else 4013 fatal("Should only be called with JVMTI enabled"); 4014 #endif 4015 JVM_END 4016 4017 /* 4018 * Return the current class's class file version. The low order 16 bits of the 4019 * returned jint contain the class's major version. The high order 16 bits 4020 * contain the class's minor version. 4021 */ 4022 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current)) 4023 oop mirror = JNIHandles::resolve_non_null(current); 4024 if (java_lang_Class::is_primitive(mirror)) { 4025 // return latest major version and minor version of 0. 4026 return JVM_CLASSFILE_MAJOR_VERSION; 4027 } 4028 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class"); 4029 4030 Klass* c = java_lang_Class::as_Klass(mirror); 4031 assert(c->is_instance_klass(), "must be"); 4032 InstanceKlass* ik = InstanceKlass::cast(c); 4033 return (ik->minor_version() << 16) | ik->major_version(); 4034 JVM_END 4035 4036 /* 4037 * Ensure that code doing a stackwalk and using javaVFrame::locals() to 4038 * get the value will see a materialized value and not a scalar-replaced 4039 * null value. 4040 */ 4041 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value)) 4042 JVM_EnsureMaterializedForStackWalk(env, value); 4043 JVM_END 4044 4045 /* 4046 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded. 4047 */ 4048 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void)) 4049 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE; 4050 JVM_END