1 /* 2 * Copyright (c) 1997, 2020, 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 "jvm.h" 27 #include "classfile/classFileStream.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/javaAssertions.hpp" 31 #include "classfile/javaClasses.inline.hpp" 32 #include "classfile/moduleEntry.hpp" 33 #include "classfile/modules.hpp" 34 #include "classfile/packageEntry.hpp" 35 #include "classfile/stringTable.hpp" 36 #include "classfile/symbolTable.hpp" 37 #include "classfile/systemDictionary.hpp" 38 #include "classfile/vmSymbols.hpp" 39 #include "gc/shared/collectedHeap.inline.hpp" 40 #include "interpreter/bytecode.hpp" 41 #include "interpreter/bytecodeUtils.hpp" 42 #include "jfr/jfrEvents.hpp" 43 #include "logging/log.hpp" 44 #include "memory/heapShared.hpp" 45 #include "memory/oopFactory.hpp" 46 #include "memory/referenceType.hpp" 47 #include "memory/resourceArea.hpp" 48 #include "memory/universe.hpp" 49 #include "oops/access.inline.hpp" 50 #include "oops/constantPool.hpp" 51 #include "oops/fieldStreams.inline.hpp" 52 #include "oops/instanceKlass.hpp" 53 #include "oops/method.hpp" 54 #include "oops/recordComponent.hpp" 55 #include "oops/objArrayKlass.hpp" 56 #include "oops/objArrayOop.inline.hpp" 57 #include "oops/oop.inline.hpp" 58 #include "prims/jvm_misc.hpp" 59 #include "prims/jvmtiExport.hpp" 60 #include "prims/jvmtiThreadState.hpp" 61 #include "prims/nativeLookup.hpp" 62 #include "prims/stackwalk.hpp" 63 #include "runtime/arguments.hpp" 64 #include "runtime/atomic.hpp" 65 #include "runtime/handles.inline.hpp" 66 #include "runtime/init.hpp" 67 #include "runtime/interfaceSupport.inline.hpp" 68 #include "runtime/deoptimization.hpp" 69 #include "runtime/handshake.hpp" 70 #include "runtime/java.hpp" 71 #include "runtime/javaCalls.hpp" 72 #include "runtime/jfieldIDWorkaround.hpp" 73 #include "runtime/jniHandles.inline.hpp" 74 #include "runtime/os.inline.hpp" 75 #include "runtime/perfData.hpp" 76 #include "runtime/reflection.hpp" 77 #include "runtime/thread.inline.hpp" 78 #include "runtime/threadSMR.hpp" 79 #include "runtime/vframe.inline.hpp" 80 #include "runtime/vmOperations.hpp" 81 #include "runtime/vm_version.hpp" 82 #include "services/attachListener.hpp" 83 #include "services/management.hpp" 84 #include "services/threadService.hpp" 85 #include "utilities/copy.hpp" 86 #include "utilities/defaultStream.hpp" 87 #include "utilities/dtrace.hpp" 88 #include "utilities/events.hpp" 89 #include "utilities/histogram.hpp" 90 #include "utilities/macros.hpp" 91 #include "utilities/utf8.hpp" 92 #if INCLUDE_CDS 93 #include "classfile/systemDictionaryShared.hpp" 94 #endif 95 96 #include <errno.h> 97 #include <jfr/recorder/jfrRecorder.hpp> 98 99 /* 100 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 101 such ctors and calls MUST NOT come between an oop declaration/init and its 102 usage because if objects are move this may cause various memory stomps, bus 103 errors and segfaults. Here is a cookbook for causing so called "naked oop 104 failures": 105 106 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 107 JVMWrapper("JVM_GetClassDeclaredFields"); 108 109 // Object address to be held directly in mirror & not visible to GC 110 oop mirror = JNIHandles::resolve_non_null(ofClass); 111 112 // If this ctor can hit a safepoint, moving objects around, then 113 ComplexConstructor foo; 114 115 // Boom! mirror may point to JUNK instead of the intended object 116 (some dereference of mirror) 117 118 // Here's another call that may block for GC, making mirror stale 119 MutexLocker ml(some_lock); 120 121 // And here's an initializer that can result in a stale oop 122 // all in one step. 123 oop o = call_that_can_throw_exception(TRAPS); 124 125 126 The solution is to keep the oop declaration BELOW the ctor or function 127 call that might cause a GC, do another resolve to reassign the oop, or 128 consider use of a Handle instead of an oop so there is immunity from object 129 motion. But note that the "QUICK" entries below do not have a handlemark 130 and thus can only support use of handles passed in. 131 */ 132 133 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 134 ResourceMark rm; 135 int line_number = -1; 136 const char * source_file = NULL; 137 const char * trace = "explicit"; 138 InstanceKlass* caller = NULL; 139 JavaThread* jthread = JavaThread::current(); 140 if (jthread->has_last_Java_frame()) { 141 vframeStream vfst(jthread); 142 143 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 144 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController"); 145 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 146 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction"); 147 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 148 149 Method* last_caller = NULL; 150 151 while (!vfst.at_end()) { 152 Method* m = vfst.method(); 153 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 154 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 155 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 156 break; 157 } 158 last_caller = m; 159 vfst.next(); 160 } 161 // if this is called from Class.forName0 and that is called from Class.forName, 162 // then print the caller of Class.forName. If this is Class.loadClass, then print 163 // that caller, otherwise keep quiet since this should be picked up elsewhere. 164 bool found_it = false; 165 if (!vfst.at_end() && 166 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 167 vfst.method()->name() == vmSymbols::forName0_name()) { 168 vfst.next(); 169 if (!vfst.at_end() && 170 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 171 vfst.method()->name() == vmSymbols::forName_name()) { 172 vfst.next(); 173 found_it = true; 174 } 175 } else if (last_caller != NULL && 176 last_caller->method_holder()->name() == 177 vmSymbols::java_lang_ClassLoader() && 178 last_caller->name() == vmSymbols::loadClass_name()) { 179 found_it = true; 180 } else if (!vfst.at_end()) { 181 if (vfst.method()->is_native()) { 182 // JNI call 183 found_it = true; 184 } 185 } 186 if (found_it && !vfst.at_end()) { 187 // found the caller 188 caller = vfst.method()->method_holder(); 189 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 190 if (line_number == -1) { 191 // show method name if it's a native method 192 trace = vfst.method()->name_and_sig_as_C_string(); 193 } 194 Symbol* s = caller->source_file_name(); 195 if (s != NULL) { 196 source_file = s->as_C_string(); 197 } 198 } 199 } 200 if (caller != NULL) { 201 if (to_class != caller) { 202 const char * from = caller->external_name(); 203 const char * to = to_class->external_name(); 204 // print in a single call to reduce interleaving between threads 205 if (source_file != NULL) { 206 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 207 } else { 208 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 209 } 210 } 211 } 212 } 213 214 void trace_class_resolution(Klass* to_class) { 215 EXCEPTION_MARK; 216 trace_class_resolution_impl(to_class, THREAD); 217 if (HAS_PENDING_EXCEPTION) { 218 CLEAR_PENDING_EXCEPTION; 219 } 220 } 221 222 // Wrapper to trace JVM functions 223 224 #ifdef ASSERT 225 Histogram* JVMHistogram; 226 volatile int JVMHistogram_lock = 0; 227 228 class JVMHistogramElement : public HistogramElement { 229 public: 230 JVMHistogramElement(const char* name); 231 }; 232 233 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 234 _name = elementName; 235 uintx count = 0; 236 237 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) { 238 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) { 239 count +=1; 240 if ( (WarnOnStalledSpinLock > 0) 241 && (count % WarnOnStalledSpinLock == 0)) { 242 warning("JVMHistogram_lock seems to be stalled"); 243 } 244 } 245 } 246 247 if(JVMHistogram == NULL) 248 JVMHistogram = new Histogram("JVM Call Counts",100); 249 250 JVMHistogram->add_element(this); 251 Atomic::dec(&JVMHistogram_lock); 252 } 253 254 #define JVMCountWrapper(arg) \ 255 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 256 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 257 258 #define JVMWrapper(arg) JVMCountWrapper(arg); 259 #else 260 #define JVMWrapper(arg) 261 #endif 262 263 264 // Interface version ///////////////////////////////////////////////////////////////////// 265 266 267 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 268 return JVM_INTERFACE_VERSION; 269 JVM_END 270 271 272 // java.lang.System ////////////////////////////////////////////////////////////////////// 273 274 275 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 276 JVMWrapper("JVM_CurrentTimeMillis"); 277 return os::javaTimeMillis(); 278 JVM_END 279 280 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 281 JVMWrapper("JVM_NanoTime"); 282 return os::javaTimeNanos(); 283 JVM_END 284 285 // The function below is actually exposed by jdk.internal.misc.VM and not 286 // java.lang.System, but we choose to keep it here so that it stays next 287 // to JVM_CurrentTimeMillis and JVM_NanoTime 288 289 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 290 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 291 292 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 293 JVMWrapper("JVM_GetNanoTimeAdjustment"); 294 jlong seconds; 295 jlong nanos; 296 297 os::javaTimeSystemUTC(seconds, nanos); 298 299 // We're going to verify that the result can fit in a long. 300 // For that we need the difference in seconds between 'seconds' 301 // and 'offset_secs' to be such that: 302 // |seconds - offset_secs| < (2^63/10^9) 303 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 304 // which makes |seconds - offset_secs| < 2^33 305 // and we will prefer +/- 2^32 as the maximum acceptable diff 306 // as 2^32 has a more natural feel than 2^33... 307 // 308 // So if |seconds - offset_secs| >= 2^32 - we return a special 309 // sentinel value (-1) which the caller should take as an 310 // exception value indicating that the offset given to us is 311 // too far from range of the current time - leading to too big 312 // a nano adjustment. The caller is expected to recover by 313 // computing a more accurate offset and calling this method 314 // again. (For the record 2^32 secs is ~136 years, so that 315 // should rarely happen) 316 // 317 jlong diff = seconds - offset_secs; 318 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 319 return -1; // sentinel value: the offset is too far off the target 320 } 321 322 // return the adjustment. If you compute a time by adding 323 // this number of nanoseconds along with the number of seconds 324 // in the offset you should get the current UTC time. 325 return (diff * (jlong)1000000000) + nanos; 326 JVM_END 327 328 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 329 jobject dst, jint dst_pos, jint length)) 330 JVMWrapper("JVM_ArrayCopy"); 331 // Check if we have null pointers 332 if (src == NULL || dst == NULL) { 333 THROW(vmSymbols::java_lang_NullPointerException()); 334 } 335 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 336 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 337 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 338 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 339 // Do copy 340 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 341 JVM_END 342 343 344 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 345 JavaValue r(T_OBJECT); 346 // public synchronized Object put(Object key, Object value); 347 HandleMark hm(THREAD); 348 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 349 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 350 JavaCalls::call_virtual(&r, 351 props, 352 SystemDictionary::Properties_klass(), 353 vmSymbols::put_name(), 354 vmSymbols::object_object_object_signature(), 355 key_str, 356 value_str, 357 THREAD); 358 } 359 360 361 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 362 363 /* 364 * Return all of the system properties in a Java String array with alternating 365 * names and values from the jvm SystemProperty. 366 * Which includes some internal and all commandline -D defined properties. 367 */ 368 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 369 JVMWrapper("JVM_GetProperties"); 370 ResourceMark rm(THREAD); 371 HandleMark hm(THREAD); 372 int ndx = 0; 373 int fixedCount = 2; 374 375 SystemProperty* p = Arguments::system_properties(); 376 int count = Arguments::PropertyList_count(p); 377 378 // Allocate result String array 379 InstanceKlass* ik = SystemDictionary::String_klass(); 380 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 381 objArrayHandle result_h(THREAD, r); 382 383 while (p != NULL) { 384 const char * key = p->key(); 385 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 386 const char * value = p->value(); 387 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 388 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL); 389 result_h->obj_at_put(ndx * 2, key_str()); 390 result_h->obj_at_put(ndx * 2 + 1, value_str()); 391 ndx++; 392 } 393 p = p->next(); 394 } 395 396 // Convert the -XX:MaxDirectMemorySize= command line flag 397 // to the sun.nio.MaxDirectMemorySize property. 398 // Do this after setting user properties to prevent people 399 // from setting the value with a -D option, as requested. 400 // Leave empty if not supplied 401 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 402 char as_chars[256]; 403 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 404 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 405 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 406 result_h->obj_at_put(ndx * 2, key_str()); 407 result_h->obj_at_put(ndx * 2 + 1, value_str()); 408 ndx++; 409 } 410 411 // JVM monitoring and management support 412 // Add the sun.management.compiler property for the compiler's name 413 { 414 #undef CSIZE 415 #if defined(_LP64) || defined(_WIN64) 416 #define CSIZE "64-Bit " 417 #else 418 #define CSIZE 419 #endif // 64bit 420 421 #ifdef TIERED 422 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 423 #else 424 #if defined(COMPILER1) 425 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 426 #elif defined(COMPILER2) 427 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 428 #elif INCLUDE_JVMCI 429 #error "INCLUDE_JVMCI should imply TIERED" 430 #else 431 const char* compiler_name = ""; 432 #endif // compilers 433 #endif // TIERED 434 435 if (*compiler_name != '\0' && 436 (Arguments::mode() != Arguments::_int)) { 437 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 438 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 439 result_h->obj_at_put(ndx * 2, key_str()); 440 result_h->obj_at_put(ndx * 2 + 1, value_str()); 441 ndx++; 442 } 443 } 444 445 return (jobjectArray) JNIHandles::make_local(env, result_h()); 446 JVM_END 447 448 449 /* 450 * Return the temporary directory that the VM uses for the attach 451 * and perf data files. 452 * 453 * It is important that this directory is well-known and the 454 * same for all VM instances. It cannot be affected by configuration 455 * variables such as java.io.tmpdir. 456 */ 457 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 458 JVMWrapper("JVM_GetTemporaryDirectory"); 459 HandleMark hm(THREAD); 460 const char* temp_dir = os::get_temp_directory(); 461 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 462 return (jstring) JNIHandles::make_local(env, h()); 463 JVM_END 464 465 466 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 467 468 extern volatile jint vm_created; 469 470 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 471 JVMWrapper("JVM_BeforeHalt"); 472 EventShutdown event; 473 if (event.should_commit()) { 474 event.set_reason("Shutdown requested from Java"); 475 event.commit(); 476 } 477 JVM_END 478 479 480 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 481 before_exit(thread); 482 vm_exit(code); 483 JVM_END 484 485 486 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 487 JVMWrapper("JVM_GC"); 488 if (!DisableExplicitGC) { 489 Universe::heap()->collect(GCCause::_java_lang_system_gc); 490 } 491 JVM_END 492 493 494 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 495 JVMWrapper("JVM_MaxObjectInspectionAge"); 496 return Universe::heap()->millis_since_last_gc(); 497 JVM_END 498 499 500 static inline jlong convert_size_t_to_jlong(size_t val) { 501 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 502 NOT_LP64 (return (jlong)val;) 503 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 504 } 505 506 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 507 JVMWrapper("JVM_TotalMemory"); 508 size_t n = Universe::heap()->capacity(); 509 return convert_size_t_to_jlong(n); 510 JVM_END 511 512 513 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 514 JVMWrapper("JVM_FreeMemory"); 515 size_t n = Universe::heap()->unused(); 516 return convert_size_t_to_jlong(n); 517 JVM_END 518 519 520 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 521 JVMWrapper("JVM_MaxMemory"); 522 size_t n = Universe::heap()->max_capacity(); 523 return convert_size_t_to_jlong(n); 524 JVM_END 525 526 527 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 528 JVMWrapper("JVM_ActiveProcessorCount"); 529 return os::active_processor_count(); 530 JVM_END 531 532 533 534 // java.lang.Throwable ////////////////////////////////////////////////////// 535 536 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 537 JVMWrapper("JVM_FillInStackTrace"); 538 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 539 java_lang_Throwable::fill_in_stack_trace(exception); 540 JVM_END 541 542 // java.lang.NullPointerException /////////////////////////////////////////// 543 544 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 545 if (!ShowCodeDetailsInExceptionMessages) return NULL; 546 547 oop exc = JNIHandles::resolve_non_null(throwable); 548 549 Method* method; 550 int bci; 551 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 552 return NULL; 553 } 554 if (method->is_native()) { 555 return NULL; 556 } 557 558 stringStream ss; 559 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 560 if (ok) { 561 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 562 return (jstring) JNIHandles::make_local(env, result); 563 } else { 564 return NULL; 565 } 566 JVM_END 567 568 // java.lang.StackTraceElement ////////////////////////////////////////////// 569 570 571 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 572 JVMWrapper("JVM_InitStackTraceElementArray"); 573 Handle exception(THREAD, JNIHandles::resolve(throwable)); 574 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 575 objArrayHandle stack_trace(THREAD, st); 576 // Fill in the allocated stack trace 577 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 578 JVM_END 579 580 581 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 582 JVMWrapper("JVM_InitStackTraceElement"); 583 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 584 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 585 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 586 JVM_END 587 588 589 // java.lang.StackWalker ////////////////////////////////////////////////////// 590 591 592 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 593 jint skip_frames, jint frame_count, jint start_index, 594 jobjectArray frames)) 595 JVMWrapper("JVM_CallStackWalk"); 596 JavaThread* jt = (JavaThread*) THREAD; 597 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 598 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 599 } 600 601 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 602 603 // frames array is a Class<?>[] array when only getting caller reference, 604 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 605 // be null. 606 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 607 objArrayHandle frames_array_h(THREAD, fa); 608 609 int limit = start_index + frame_count; 610 if (frames_array_h->length() < limit) { 611 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 612 } 613 614 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 615 start_index, frames_array_h, CHECK_NULL); 616 return JNIHandles::make_local(env, result); 617 JVM_END 618 619 620 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 621 jint frame_count, jint start_index, 622 jobjectArray frames)) 623 JVMWrapper("JVM_MoreStackWalk"); 624 JavaThread* jt = (JavaThread*) THREAD; 625 626 // frames array is a Class<?>[] array when only getting caller reference, 627 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 628 // be null. 629 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 630 objArrayHandle frames_array_h(THREAD, fa); 631 632 int limit = start_index+frame_count; 633 if (frames_array_h->length() < limit) { 634 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 635 } 636 637 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 638 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 639 start_index, frames_array_h, THREAD); 640 JVM_END 641 642 // java.lang.Object /////////////////////////////////////////////// 643 644 645 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 646 JVMWrapper("JVM_IHashCode"); 647 // as implemented in the classic virtual machine; return 0 if object is NULL 648 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 649 JVM_END 650 651 652 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 653 JVMWrapper("JVM_MonitorWait"); 654 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 655 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 656 if (JvmtiExport::should_post_monitor_wait()) { 657 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 658 659 // The current thread already owns the monitor and it has not yet 660 // been added to the wait queue so the current thread cannot be 661 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 662 // event handler cannot accidentally consume an unpark() meant for 663 // the ParkEvent associated with this ObjectMonitor. 664 } 665 ObjectSynchronizer::wait(obj, ms, CHECK); 666 JVM_END 667 668 669 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 670 JVMWrapper("JVM_MonitorNotify"); 671 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 672 ObjectSynchronizer::notify(obj, CHECK); 673 JVM_END 674 675 676 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 677 JVMWrapper("JVM_MonitorNotifyAll"); 678 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 679 ObjectSynchronizer::notifyall(obj, CHECK); 680 JVM_END 681 682 683 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 684 JVMWrapper("JVM_Clone"); 685 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 686 Klass* klass = obj->klass(); 687 JvmtiVMObjectAllocEventCollector oam; 688 689 #ifdef ASSERT 690 // Just checking that the cloneable flag is set correct 691 if (obj->is_array()) { 692 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 693 } else { 694 guarantee(obj->is_instance(), "should be instanceOop"); 695 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 696 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 697 } 698 #endif 699 700 // Check if class of obj supports the Cloneable interface. 701 // All arrays are considered to be cloneable (See JLS 20.1.5). 702 // All j.l.r.Reference classes are considered non-cloneable. 703 if (!klass->is_cloneable() || 704 (klass->is_instance_klass() && 705 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 706 ResourceMark rm(THREAD); 707 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 708 } 709 710 // Make shallow object copy 711 const int size = obj->size(); 712 oop new_obj_oop = NULL; 713 if (obj->is_array()) { 714 const int length = ((arrayOop)obj())->length(); 715 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 716 /* do_zero */ true, CHECK_NULL); 717 } else { 718 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 719 } 720 721 HeapAccess<>::clone(obj(), new_obj_oop, size); 722 723 Handle new_obj(THREAD, new_obj_oop); 724 // Caution: this involves a java upcall, so the clone should be 725 // "gc-robust" by this stage. 726 if (klass->has_finalizer()) { 727 assert(obj->is_instance(), "should be instanceOop"); 728 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 729 new_obj = Handle(THREAD, new_obj_oop); 730 } 731 732 return JNIHandles::make_local(env, new_obj()); 733 JVM_END 734 735 // java.io.File /////////////////////////////////////////////////////////////// 736 737 JVM_LEAF(char*, JVM_NativePath(char* path)) 738 JVMWrapper("JVM_NativePath"); 739 return os::native_path(path); 740 JVM_END 741 742 743 // Misc. class handling /////////////////////////////////////////////////////////// 744 745 746 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 747 JVMWrapper("JVM_GetCallerClass"); 748 749 // Getting the class of the caller frame. 750 // 751 // The call stack at this point looks something like this: 752 // 753 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 754 // [1] [ @CallerSensitive API.method ] 755 // [.] [ (skipped intermediate frames) ] 756 // [n] [ caller ] 757 vframeStream vfst(thread); 758 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 759 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 760 Method* m = vfst.method(); 761 assert(m != NULL, "sanity"); 762 switch (n) { 763 case 0: 764 // This must only be called from Reflection.getCallerClass 765 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 766 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 767 } 768 // fall-through 769 case 1: 770 // Frame 0 and 1 must be caller sensitive. 771 if (!m->caller_sensitive()) { 772 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 773 } 774 break; 775 default: 776 if (!m->is_ignored_by_security_stack_walk()) { 777 // We have reached the desired frame; return the holder class. 778 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 779 } 780 break; 781 } 782 } 783 return NULL; 784 JVM_END 785 786 787 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 788 JVMWrapper("JVM_FindPrimitiveClass"); 789 oop mirror = NULL; 790 BasicType t = name2type(utf); 791 if (t != T_ILLEGAL && !is_reference_type(t)) { 792 mirror = Universe::java_mirror(t); 793 } 794 if (mirror == NULL) { 795 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 796 } else { 797 return (jclass) JNIHandles::make_local(env, mirror); 798 } 799 JVM_END 800 801 802 // Returns a class loaded by the bootstrap class loader; or null 803 // if not found. ClassNotFoundException is not thrown. 804 // FindClassFromBootLoader is exported to the launcher for windows. 805 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 806 const char* name)) 807 JVMWrapper("JVM_FindClassFromBootLoader"); 808 809 // Java libraries should ensure that name is never null... 810 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 811 // It's impossible to create this class; the name cannot fit 812 // into the constant pool. 813 return NULL; 814 } 815 816 TempNewSymbol h_name = SymbolTable::new_symbol(name); 817 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 818 if (k == NULL) { 819 return NULL; 820 } 821 822 if (log_is_enabled(Debug, class, resolve)) { 823 trace_class_resolution(k); 824 } 825 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 826 JVM_END 827 828 // Find a class with this name in this loader, using the caller's protection domain. 829 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 830 jboolean init, jobject loader, 831 jclass caller)) 832 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 833 // Java libraries should ensure that name is never null... 834 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 835 // It's impossible to create this class; the name cannot fit 836 // into the constant pool. 837 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 838 } 839 840 TempNewSymbol h_name = SymbolTable::new_symbol(name); 841 842 oop loader_oop = JNIHandles::resolve(loader); 843 oop from_class = JNIHandles::resolve(caller); 844 oop protection_domain = NULL; 845 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 846 // NPE. Put it in another way, the bootstrap class loader has all permission and 847 // thus no checkPackageAccess equivalence in the VM class loader. 848 // The caller is also passed as NULL by the java code if there is no security 849 // manager to avoid the performance cost of getting the calling class. 850 if (from_class != NULL && loader_oop != NULL) { 851 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 852 } 853 854 Handle h_loader(THREAD, loader_oop); 855 Handle h_prot(THREAD, protection_domain); 856 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 857 h_prot, false, THREAD); 858 859 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 860 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 861 } 862 return result; 863 JVM_END 864 865 // Currently only called from the old verifier. 866 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 867 jboolean init, jclass from)) 868 JVMWrapper("JVM_FindClassFromClass"); 869 if (name == NULL) { 870 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 871 } 872 if ((int)strlen(name) > Symbol::max_length()) { 873 // It's impossible to create this class; the name cannot fit 874 // into the constant pool. 875 Exceptions::fthrow(THREAD_AND_LOCATION, 876 vmSymbols::java_lang_NoClassDefFoundError(), 877 "Class name exceeds maximum length of %d: %s", 878 Symbol::max_length(), 879 name); 880 return 0; 881 } 882 TempNewSymbol h_name = SymbolTable::new_symbol(name); 883 oop from_class_oop = JNIHandles::resolve(from); 884 Klass* from_class = (from_class_oop == NULL) 885 ? (Klass*)NULL 886 : java_lang_Class::as_Klass(from_class_oop); 887 oop class_loader = NULL; 888 oop protection_domain = NULL; 889 if (from_class != NULL) { 890 class_loader = from_class->class_loader(); 891 protection_domain = from_class->protection_domain(); 892 } 893 Handle h_loader(THREAD, class_loader); 894 Handle h_prot (THREAD, protection_domain); 895 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 896 h_prot, true, thread); 897 898 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 899 // this function is generally only used for class loading during verification. 900 ResourceMark rm; 901 oop from_mirror = JNIHandles::resolve_non_null(from); 902 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 903 const char * from_name = from_class->external_name(); 904 905 oop mirror = JNIHandles::resolve_non_null(result); 906 Klass* to_class = java_lang_Class::as_Klass(mirror); 907 const char * to = to_class->external_name(); 908 log_debug(class, resolve)("%s %s (verification)", from_name, to); 909 } 910 911 return result; 912 JVM_END 913 914 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 915 if (loader.is_null()) { 916 return; 917 } 918 919 // check whether the current caller thread holds the lock or not. 920 // If not, increment the corresponding counter 921 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 922 ObjectSynchronizer::owner_self) { 923 counter->inc(); 924 } 925 } 926 927 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 928 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 929 jobject loader, const jbyte *buf, 930 jsize len, jobject pd, const char *source, 931 TRAPS) { 932 if (source == NULL) source = "__JVM_DefineClass__"; 933 934 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 935 JavaThread* jt = (JavaThread*) THREAD; 936 937 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 938 ClassLoader::perf_define_appclass_selftime(), 939 ClassLoader::perf_define_appclasses(), 940 jt->get_thread_stat()->perf_recursion_counts_addr(), 941 jt->get_thread_stat()->perf_timers_addr(), 942 PerfClassTraceTime::DEFINE_CLASS); 943 944 if (UsePerfData) { 945 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 946 } 947 948 // Since exceptions can be thrown, class initialization can take place 949 // if name is NULL no check for class name in .class stream has to be made. 950 TempNewSymbol class_name = NULL; 951 if (name != NULL) { 952 const int str_len = (int)strlen(name); 953 if (str_len > Symbol::max_length()) { 954 // It's impossible to create this class; the name cannot fit 955 // into the constant pool. 956 Exceptions::fthrow(THREAD_AND_LOCATION, 957 vmSymbols::java_lang_NoClassDefFoundError(), 958 "Class name exceeds maximum length of %d: %s", 959 Symbol::max_length(), 960 name); 961 return 0; 962 } 963 class_name = SymbolTable::new_symbol(name, str_len); 964 } 965 966 ResourceMark rm(THREAD); 967 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 968 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 969 if (UsePerfData) { 970 is_lock_held_by_thread(class_loader, 971 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 972 THREAD); 973 } 974 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 975 Klass* k = SystemDictionary::resolve_from_stream(class_name, 976 class_loader, 977 protection_domain, 978 &st, 979 CHECK_NULL); 980 981 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 982 trace_class_resolution(k); 983 } 984 985 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 986 } 987 988 enum { 989 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 990 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 991 WEAK_CLASS = java_lang_invoke_MemberName::MN_WEAK_CLASS, 992 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 993 }; 994 995 /* 996 * Define a class with the specified flags that indicates if it's a nestmate, 997 * hidden, or weakly referenced from class loader. 998 */ 999 static jclass jvm_lookup_define_class(JNIEnv *env, jclass lookup, const char *name, 1000 jobject loader, const jbyte *buf, jsize len, jobject pd, 1001 jboolean init, int flags, jobject classData, TRAPS) { 1002 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 1003 JavaThread* jt = (JavaThread*) THREAD; 1004 ResourceMark rm(THREAD); 1005 1006 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup)); 1007 // Lookup class must be a non-null instance 1008 if (lookup_k == NULL) { 1009 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1010 } 1011 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass"); 1012 1013 jboolean is_nestmate = (flags & NESTMATE) == NESTMATE; 1014 jboolean is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1015 jboolean is_weak = (flags & WEAK_CLASS) == WEAK_CLASS; 1016 jboolean vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1017 1018 InstanceKlass* host_class = NULL; 1019 if (is_nestmate) { 1020 host_class = InstanceKlass::cast(lookup_k)->runtime_nest_host(CHECK_NULL); 1021 } 1022 1023 if (log_is_enabled(Info, class, nestmates)) { 1024 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1025 name, 1026 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1027 is_nestmate ? host_class->external_name() : "", 1028 is_hidden ? "hidden" : "not hidden", 1029 is_weak ? "weak" : "strong", 1030 vm_annotations ? "with vm annotations" : "without vm annotation"); 1031 } 1032 1033 if (!is_hidden) { 1034 // classData is only applicable for hidden classes 1035 if (classData != NULL) { 1036 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1037 } 1038 if (is_nestmate) { 1039 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1040 } 1041 if (is_weak) { 1042 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "weak class is only applicable for hidden classes"); 1043 } 1044 if (vm_annotations) { 1045 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1046 } 1047 if (flags) { 1048 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1049 err_msg("flag 0x%x can only be set for hidden classes", flags)); 1050 } 1051 } 1052 1053 1054 // Since exceptions can be thrown, class initialization can take place 1055 // if name is NULL no check for class name in .class stream has to be made. 1056 TempNewSymbol class_name = NULL; 1057 if (name != NULL) { 1058 const int str_len = (int)strlen(name); 1059 if (str_len > Symbol::max_length()) { 1060 // It's impossible to create this class; the name cannot fit 1061 // into the constant pool. 1062 Exceptions::fthrow(THREAD_AND_LOCATION, 1063 vmSymbols::java_lang_NoClassDefFoundError(), 1064 "Class name exceeds maximum length of %d: %s", 1065 Symbol::max_length(), 1066 name); 1067 return 0; 1068 } 1069 class_name = SymbolTable::new_symbol(name, str_len); 1070 } 1071 1072 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 1073 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1074 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1075 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 1076 1077 Klass* defined_k; 1078 if (!is_hidden) { 1079 defined_k = SystemDictionary::resolve_from_stream(class_name, 1080 class_loader, 1081 protection_domain, 1082 &st, 1083 CHECK_NULL); 1084 1085 if (log_is_enabled(Debug, class, resolve) && defined_k != NULL) { 1086 trace_class_resolution(defined_k); 1087 } 1088 } else { // hidden 1089 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1090 ClassLoadInfo cl_info(protection_domain, 1091 NULL, // unsafe_anonymous_host 1092 NULL, // cp_patches 1093 host_class, 1094 classData_h, 1095 is_hidden, 1096 is_weak, 1097 vm_annotations); 1098 defined_k = SystemDictionary::parse_stream(class_name, 1099 class_loader, 1100 &st, 1101 cl_info, 1102 CHECK_NULL); 1103 if (defined_k == NULL) { 1104 THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a hidden class"); 1105 } 1106 1107 // The hidden class loader data has been artificially been kept alive to 1108 // this point. The mirror and any instances of this class have to keep 1109 // it alive afterwards. 1110 InstanceKlass::cast(defined_k)->class_loader_data()->dec_keep_alive(); 1111 1112 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1113 InstanceKlass* ik = InstanceKlass::cast(defined_k); 1114 ModuleEntry* module = ik->module(); 1115 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1116 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1117 module_name, 1118 ik->external_name(), 1119 host_class->external_name(), 1120 ik->is_hidden() ? "is hidden" : "is not hidden"); 1121 } 1122 } 1123 assert(Reflection::is_same_class_package(lookup_k, defined_k), 1124 "lookup class and defined class are in different packages"); 1125 1126 InstanceKlass* ik = InstanceKlass::cast(defined_k); 1127 if (init) { 1128 ik->initialize(CHECK_NULL); 1129 } else { 1130 ik->link_class(CHECK_NULL); 1131 } 1132 1133 return (jclass) JNIHandles::make_local(env, defined_k->java_mirror()); 1134 } 1135 1136 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1137 JVMWrapper("JVM_DefineClass"); 1138 1139 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 1140 JVM_END 1141 1142 /* 1143 * Define a class with the specified lookup class. 1144 * lookup: Lookup class 1145 * name: the name of the class 1146 * loader: defining class loader 1147 * buf: class bytes 1148 * len: length of class bytes 1149 * pd: protection domain 1150 * init: initialize the class 1151 * flags: properties of the class 1152 * classData: private static pre-initialized field 1153 */ 1154 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, jobject loader, 1155 const jbyte *buf, jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1156 JVMWrapper("JVM_LookupDefineClass"); 1157 1158 if (lookup == NULL) { 1159 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1160 } 1161 1162 assert(buf != NULL, "buf must not be NULL"); 1163 1164 return jvm_lookup_define_class(env, lookup, name, loader, buf, len, pd, initialize, flags, classData, THREAD); 1165 JVM_END 1166 1167 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1168 JVMWrapper("JVM_DefineClassWithSource"); 1169 1170 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 1171 JVM_END 1172 1173 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1174 JVMWrapper("JVM_FindLoadedClass"); 1175 ResourceMark rm(THREAD); 1176 1177 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1178 char* str = java_lang_String::as_utf8_string(h_name()); 1179 1180 // Sanity check, don't expect null 1181 if (str == NULL) return NULL; 1182 1183 // Internalize the string, converting '.' to '/' in string. 1184 char* p = (char*)str; 1185 while (*p != '\0') { 1186 if (*p == '.') { 1187 *p = '/'; 1188 } 1189 p++; 1190 } 1191 1192 const int str_len = (int)(p - str); 1193 if (str_len > Symbol::max_length()) { 1194 // It's impossible to create this class; the name cannot fit 1195 // into the constant pool. 1196 return NULL; 1197 } 1198 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1199 1200 // Security Note: 1201 // The Java level wrapper will perform the necessary security check allowing 1202 // us to pass the NULL as the initiating class loader. 1203 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1204 if (UsePerfData) { 1205 is_lock_held_by_thread(h_loader, 1206 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1207 THREAD); 1208 } 1209 1210 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1211 h_loader, 1212 Handle(), 1213 CHECK_NULL); 1214 #if INCLUDE_CDS 1215 if (k == NULL) { 1216 // If the class is not already loaded, try to see if it's in the shared 1217 // archive for the current classloader (h_loader). 1218 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1219 } 1220 #endif 1221 return (k == NULL) ? NULL : 1222 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1223 JVM_END 1224 1225 // Module support ////////////////////////////////////////////////////////////////////////////// 1226 1227 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1228 jstring location, const char* const* packages, jsize num_packages)) 1229 JVMWrapper("JVM_DefineModule"); 1230 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1231 JVM_END 1232 1233 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1234 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1235 Modules::set_bootloader_unnamed_module(module, CHECK); 1236 JVM_END 1237 1238 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1239 JVMWrapper("JVM_AddModuleExports"); 1240 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1241 JVM_END 1242 1243 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1244 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1245 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1246 JVM_END 1247 1248 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1249 JVMWrapper("JVM_AddModuleExportsToAll"); 1250 Modules::add_module_exports(from_module, package, NULL, CHECK); 1251 JVM_END 1252 1253 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1254 JVMWrapper("JVM_AddReadsModule"); 1255 Modules::add_reads_module(from_module, source_module, CHECK); 1256 JVM_END 1257 1258 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1259 1260 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1261 assert (cls != NULL, "illegal class"); 1262 JVMWrapper("JVM_InitClassName"); 1263 JvmtiVMObjectAllocEventCollector oam; 1264 ResourceMark rm(THREAD); 1265 HandleMark hm(THREAD); 1266 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1267 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1268 return (jstring) JNIHandles::make_local(env, result); 1269 JVM_END 1270 1271 1272 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1273 JVMWrapper("JVM_GetClassInterfaces"); 1274 JvmtiVMObjectAllocEventCollector oam; 1275 oop mirror = JNIHandles::resolve_non_null(cls); 1276 1277 // Special handling for primitive objects 1278 if (java_lang_Class::is_primitive(mirror)) { 1279 // Primitive objects does not have any interfaces 1280 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1281 return (jobjectArray) JNIHandles::make_local(env, r); 1282 } 1283 1284 Klass* klass = java_lang_Class::as_Klass(mirror); 1285 // Figure size of result array 1286 int size; 1287 if (klass->is_instance_klass()) { 1288 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1289 } else { 1290 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1291 size = 2; 1292 } 1293 1294 // Allocate result array 1295 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1296 objArrayHandle result (THREAD, r); 1297 // Fill in result 1298 if (klass->is_instance_klass()) { 1299 // Regular instance klass, fill in all local interfaces 1300 for (int index = 0; index < size; index++) { 1301 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1302 result->obj_at_put(index, k->java_mirror()); 1303 } 1304 } else { 1305 // All arrays implement java.lang.Cloneable and java.io.Serializable 1306 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1307 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1308 } 1309 return (jobjectArray) JNIHandles::make_local(env, result()); 1310 JVM_END 1311 1312 1313 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1314 JVMWrapper("JVM_IsInterface"); 1315 oop mirror = JNIHandles::resolve_non_null(cls); 1316 if (java_lang_Class::is_primitive(mirror)) { 1317 return JNI_FALSE; 1318 } 1319 Klass* k = java_lang_Class::as_Klass(mirror); 1320 jboolean result = k->is_interface(); 1321 assert(!result || k->is_instance_klass(), 1322 "all interfaces are instance types"); 1323 // The compiler intrinsic for isInterface tests the 1324 // Klass::_access_flags bits in the same way. 1325 return result; 1326 JVM_END 1327 1328 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1329 JVMWrapper("JVM_IsHiddenClass"); 1330 oop mirror = JNIHandles::resolve_non_null(cls); 1331 if (java_lang_Class::is_primitive(mirror)) { 1332 return JNI_FALSE; 1333 } 1334 Klass* k = java_lang_Class::as_Klass(mirror); 1335 return k->is_hidden(); 1336 JVM_END 1337 1338 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1339 JVMWrapper("JVM_GetClassSigners"); 1340 JvmtiVMObjectAllocEventCollector oam; 1341 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1342 // There are no signers for primitive types 1343 return NULL; 1344 } 1345 1346 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls))); 1347 1348 // If there are no signers set in the class, or if the class 1349 // is an array, return NULL. 1350 if (signers == NULL) return NULL; 1351 1352 // copy of the signers array 1353 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1354 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1355 for (int index = 0; index < signers->length(); index++) { 1356 signers_copy->obj_at_put(index, signers->obj_at(index)); 1357 } 1358 1359 // return the copy 1360 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1361 JVM_END 1362 1363 1364 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1365 JVMWrapper("JVM_SetClassSigners"); 1366 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1367 // This call is ignored for primitive types and arrays. 1368 // Signers are only set once, ClassLoader.java, and thus shouldn't 1369 // be called with an array. Only the bootstrap loader creates arrays. 1370 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1371 if (k->is_instance_klass()) { 1372 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1373 } 1374 } 1375 JVM_END 1376 1377 1378 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1379 JVMWrapper("JVM_GetProtectionDomain"); 1380 if (JNIHandles::resolve(cls) == NULL) { 1381 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1382 } 1383 1384 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1385 // Primitive types does not have a protection domain. 1386 return NULL; 1387 } 1388 1389 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1390 return (jobject) JNIHandles::make_local(env, pd); 1391 JVM_END 1392 1393 1394 // Returns the inherited_access_control_context field of the running thread. 1395 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1396 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1397 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1398 return JNIHandles::make_local(env, result); 1399 JVM_END 1400 1401 class RegisterArrayForGC { 1402 private: 1403 JavaThread *_thread; 1404 public: 1405 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1406 _thread = thread; 1407 _thread->register_array_for_gc(array); 1408 } 1409 1410 ~RegisterArrayForGC() { 1411 _thread->register_array_for_gc(NULL); 1412 } 1413 }; 1414 1415 1416 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1417 JVMWrapper("JVM_GetStackAccessControlContext"); 1418 if (!UsePrivilegedStack) return NULL; 1419 1420 ResourceMark rm(THREAD); 1421 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1422 JvmtiVMObjectAllocEventCollector oam; 1423 1424 // count the protection domains on the execution stack. We collapse 1425 // duplicate consecutive protection domains into a single one, as 1426 // well as stopping when we hit a privileged frame. 1427 1428 oop previous_protection_domain = NULL; 1429 Handle privileged_context(thread, NULL); 1430 bool is_privileged = false; 1431 oop protection_domain = NULL; 1432 1433 // Iterate through Java frames 1434 vframeStream vfst(thread); 1435 for(; !vfst.at_end(); vfst.next()) { 1436 // get method of frame 1437 Method* method = vfst.method(); 1438 1439 // stop at the first privileged frame 1440 if (method->method_holder() == SystemDictionary::AccessController_klass() && 1441 method->name() == vmSymbols::executePrivileged_name()) 1442 { 1443 // this frame is privileged 1444 is_privileged = true; 1445 1446 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1447 1448 StackValueCollection* locals = priv->locals(); 1449 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1450 StackValue* clr_sv = locals->at(2); // Class<?> caller 1451 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1452 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1453 privileged_context = ctx_sv->get_obj(); 1454 Handle caller = clr_sv->get_obj(); 1455 1456 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1457 protection_domain = caller_klass->protection_domain(); 1458 } else { 1459 protection_domain = method->method_holder()->protection_domain(); 1460 } 1461 1462 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1463 local_array->push(protection_domain); 1464 previous_protection_domain = protection_domain; 1465 } 1466 1467 if (is_privileged) break; 1468 } 1469 1470 1471 // either all the domains on the stack were system domains, or 1472 // we had a privileged system domain 1473 if (local_array->is_empty()) { 1474 if (is_privileged && privileged_context.is_null()) return NULL; 1475 1476 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1477 return JNIHandles::make_local(env, result); 1478 } 1479 1480 // the resource area must be registered in case of a gc 1481 RegisterArrayForGC ragc(thread, local_array); 1482 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1483 local_array->length(), CHECK_NULL); 1484 objArrayHandle h_context(thread, context); 1485 for (int index = 0; index < local_array->length(); index++) { 1486 h_context->obj_at_put(index, local_array->at(index)); 1487 } 1488 1489 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1490 1491 return JNIHandles::make_local(env, result); 1492 JVM_END 1493 1494 1495 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1496 JVMWrapper("JVM_IsArrayClass"); 1497 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1498 return (k != NULL) && k->is_array_klass() ? true : false; 1499 JVM_END 1500 1501 1502 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1503 JVMWrapper("JVM_IsPrimitiveClass"); 1504 oop mirror = JNIHandles::resolve_non_null(cls); 1505 return (jboolean) java_lang_Class::is_primitive(mirror); 1506 JVM_END 1507 1508 1509 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1510 JVMWrapper("JVM_GetClassModifiers"); 1511 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1512 // Primitive type 1513 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1514 } 1515 1516 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1517 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1518 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1519 return k->modifier_flags(); 1520 JVM_END 1521 1522 1523 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1524 1525 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1526 JvmtiVMObjectAllocEventCollector oam; 1527 // ofClass is a reference to a java_lang_Class object. The mirror object 1528 // of an InstanceKlass 1529 1530 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1531 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1532 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1533 return (jobjectArray)JNIHandles::make_local(env, result); 1534 } 1535 1536 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1537 InnerClassesIterator iter(k); 1538 1539 if (iter.length() == 0) { 1540 // Neither an inner nor outer class 1541 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1542 return (jobjectArray)JNIHandles::make_local(env, result); 1543 } 1544 1545 // find inner class info 1546 constantPoolHandle cp(thread, k->constants()); 1547 int length = iter.length(); 1548 1549 // Allocate temp. result array 1550 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1551 objArrayHandle result (THREAD, r); 1552 int members = 0; 1553 1554 for (; !iter.done(); iter.next()) { 1555 int ioff = iter.inner_class_info_index(); 1556 int ooff = iter.outer_class_info_index(); 1557 1558 if (ioff != 0 && ooff != 0) { 1559 // Check to see if the name matches the class we're looking for 1560 // before attempting to find the class. 1561 if (cp->klass_name_at_matches(k, ooff)) { 1562 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1563 if (outer_klass == k) { 1564 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1565 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1566 1567 // Throws an exception if outer klass has not declared k as 1568 // an inner klass 1569 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1570 1571 result->obj_at_put(members, inner_klass->java_mirror()); 1572 members++; 1573 } 1574 } 1575 } 1576 } 1577 1578 if (members != length) { 1579 // Return array of right length 1580 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1581 for(int i = 0; i < members; i++) { 1582 res->obj_at_put(i, result->obj_at(i)); 1583 } 1584 return (jobjectArray)JNIHandles::make_local(env, res); 1585 } 1586 1587 return (jobjectArray)JNIHandles::make_local(env, result()); 1588 JVM_END 1589 1590 1591 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1592 { 1593 // ofClass is a reference to a java_lang_Class object. 1594 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1595 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1596 return NULL; 1597 } 1598 1599 bool inner_is_member = false; 1600 Klass* outer_klass 1601 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1602 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1603 if (outer_klass == NULL) return NULL; // already a top-level class 1604 if (!inner_is_member) return NULL; // a hidden or unsafe anonymous class (inside a method) 1605 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1606 } 1607 JVM_END 1608 1609 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1610 { 1611 oop mirror = JNIHandles::resolve_non_null(cls); 1612 if (java_lang_Class::is_primitive(mirror) || 1613 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1614 return NULL; 1615 } 1616 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1617 int ooff = 0, noff = 0; 1618 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1619 if (noff != 0) { 1620 constantPoolHandle i_cp(thread, k->constants()); 1621 Symbol* name = i_cp->symbol_at(noff); 1622 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1623 return (jstring) JNIHandles::make_local(env, str()); 1624 } 1625 } 1626 return NULL; 1627 } 1628 JVM_END 1629 1630 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1631 assert (cls != NULL, "illegal class"); 1632 JVMWrapper("JVM_GetClassSignature"); 1633 JvmtiVMObjectAllocEventCollector oam; 1634 ResourceMark rm(THREAD); 1635 // Return null for arrays and primatives 1636 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1637 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1638 if (k->is_instance_klass()) { 1639 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1640 if (sym == NULL) return NULL; 1641 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1642 return (jstring) JNIHandles::make_local(env, str()); 1643 } 1644 } 1645 return NULL; 1646 JVM_END 1647 1648 1649 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1650 assert (cls != NULL, "illegal class"); 1651 JVMWrapper("JVM_GetClassAnnotations"); 1652 1653 // Return null for arrays and primitives 1654 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1655 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1656 if (k->is_instance_klass()) { 1657 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1658 return (jbyteArray) JNIHandles::make_local(env, a); 1659 } 1660 } 1661 return NULL; 1662 JVM_END 1663 1664 1665 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1666 // some of this code was adapted from from jni_FromReflectedField 1667 1668 oop reflected = JNIHandles::resolve_non_null(field); 1669 oop mirror = java_lang_reflect_Field::clazz(reflected); 1670 Klass* k = java_lang_Class::as_Klass(mirror); 1671 int slot = java_lang_reflect_Field::slot(reflected); 1672 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1673 1674 InstanceKlass* ik = InstanceKlass::cast(k); 1675 intptr_t offset = ik->field_offset(slot); 1676 1677 if (modifiers & JVM_ACC_STATIC) { 1678 // for static fields we only look in the current class 1679 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1680 assert(false, "cannot find static field"); 1681 return false; 1682 } 1683 } else { 1684 // for instance fields we start with the current class and work 1685 // our way up through the superclass chain 1686 if (!ik->find_field_from_offset(offset, false, &fd)) { 1687 assert(false, "cannot find instance field"); 1688 return false; 1689 } 1690 } 1691 return true; 1692 } 1693 1694 static Method* jvm_get_method_common(jobject method) { 1695 // some of this code was adapted from from jni_FromReflectedMethod 1696 1697 oop reflected = JNIHandles::resolve_non_null(method); 1698 oop mirror = NULL; 1699 int slot = 0; 1700 1701 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1702 mirror = java_lang_reflect_Constructor::clazz(reflected); 1703 slot = java_lang_reflect_Constructor::slot(reflected); 1704 } else { 1705 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1706 "wrong type"); 1707 mirror = java_lang_reflect_Method::clazz(reflected); 1708 slot = java_lang_reflect_Method::slot(reflected); 1709 } 1710 Klass* k = java_lang_Class::as_Klass(mirror); 1711 1712 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1713 assert(m != NULL, "cannot find method"); 1714 return m; // caller has to deal with NULL in product mode 1715 } 1716 1717 /* Type use annotations support (JDK 1.8) */ 1718 1719 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1720 assert (cls != NULL, "illegal class"); 1721 JVMWrapper("JVM_GetClassTypeAnnotations"); 1722 ResourceMark rm(THREAD); 1723 // Return null for arrays and primitives 1724 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1725 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1726 if (k->is_instance_klass()) { 1727 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1728 if (type_annotations != NULL) { 1729 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1730 return (jbyteArray) JNIHandles::make_local(env, a); 1731 } 1732 } 1733 } 1734 return NULL; 1735 JVM_END 1736 1737 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1738 assert (method != NULL, "illegal method"); 1739 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1740 1741 // method is a handle to a java.lang.reflect.Method object 1742 Method* m = jvm_get_method_common(method); 1743 if (m == NULL) { 1744 return NULL; 1745 } 1746 1747 AnnotationArray* type_annotations = m->type_annotations(); 1748 if (type_annotations != NULL) { 1749 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1750 return (jbyteArray) JNIHandles::make_local(env, a); 1751 } 1752 1753 return NULL; 1754 JVM_END 1755 1756 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1757 assert (field != NULL, "illegal field"); 1758 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1759 1760 fieldDescriptor fd; 1761 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1762 if (!gotFd) { 1763 return NULL; 1764 } 1765 1766 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1767 JVM_END 1768 1769 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1770 if (!cp->is_within_bounds(index)) { 1771 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1772 } 1773 } 1774 1775 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1776 { 1777 JVMWrapper("JVM_GetMethodParameters"); 1778 // method is a handle to a java.lang.reflect.Method object 1779 Method* method_ptr = jvm_get_method_common(method); 1780 methodHandle mh (THREAD, method_ptr); 1781 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1782 const int num_params = mh->method_parameters_length(); 1783 1784 if (num_params < 0) { 1785 // A -1 return value from method_parameters_length means there is no 1786 // parameter data. Return null to indicate this to the reflection 1787 // API. 1788 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1789 return (jobjectArray)NULL; 1790 } else { 1791 // Otherwise, we return something up to reflection, even if it is 1792 // a zero-length array. Why? Because in some cases this can 1793 // trigger a MalformedParametersException. 1794 1795 // make sure all the symbols are properly formatted 1796 for (int i = 0; i < num_params; i++) { 1797 MethodParametersElement* params = mh->method_parameters_start(); 1798 int index = params[i].name_cp_index; 1799 constantPoolHandle cp(THREAD, mh->constants()); 1800 bounds_check(cp, index, CHECK_NULL); 1801 1802 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1803 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1804 "Wrong type at constant pool index"); 1805 } 1806 1807 } 1808 1809 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1810 objArrayHandle result (THREAD, result_oop); 1811 1812 for (int i = 0; i < num_params; i++) { 1813 MethodParametersElement* params = mh->method_parameters_start(); 1814 // For a 0 index, give a NULL symbol 1815 Symbol* sym = 0 != params[i].name_cp_index ? 1816 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1817 int flags = params[i].flags; 1818 oop param = Reflection::new_parameter(reflected_method, i, sym, 1819 flags, CHECK_NULL); 1820 result->obj_at_put(i, param); 1821 } 1822 return (jobjectArray)JNIHandles::make_local(env, result()); 1823 } 1824 } 1825 JVM_END 1826 1827 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1828 1829 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1830 { 1831 JVMWrapper("JVM_GetClassDeclaredFields"); 1832 JvmtiVMObjectAllocEventCollector oam; 1833 1834 // Exclude primitive types and array types 1835 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1836 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1837 // Return empty array 1838 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1839 return (jobjectArray) JNIHandles::make_local(env, res); 1840 } 1841 1842 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1843 constantPoolHandle cp(THREAD, k->constants()); 1844 1845 // Ensure class is linked 1846 k->link_class(CHECK_NULL); 1847 1848 // Allocate result 1849 int num_fields; 1850 1851 if (publicOnly) { 1852 num_fields = 0; 1853 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1854 if (fs.access_flags().is_public()) ++num_fields; 1855 } 1856 } else { 1857 num_fields = k->java_fields_count(); 1858 } 1859 1860 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1861 objArrayHandle result (THREAD, r); 1862 1863 int out_idx = 0; 1864 fieldDescriptor fd; 1865 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1866 if (!publicOnly || fs.access_flags().is_public()) { 1867 fd.reinitialize(k, fs.index()); 1868 oop field = Reflection::new_field(&fd, CHECK_NULL); 1869 result->obj_at_put(out_idx, field); 1870 ++out_idx; 1871 } 1872 } 1873 assert(out_idx == num_fields, "just checking"); 1874 return (jobjectArray) JNIHandles::make_local(env, result()); 1875 } 1876 JVM_END 1877 1878 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1879 { 1880 JVMWrapper("JVM_IsRecord"); 1881 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1882 if (k != NULL && k->is_instance_klass()) { 1883 InstanceKlass* ik = InstanceKlass::cast(k); 1884 return ik->is_record(); 1885 } else { 1886 return false; 1887 } 1888 } 1889 JVM_END 1890 1891 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1892 { 1893 JVMWrapper("JVM_GetRecordComponents"); 1894 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1895 assert(c->is_instance_klass(), "must be"); 1896 InstanceKlass* ik = InstanceKlass::cast(c); 1897 1898 if (ik->is_record()) { 1899 Array<RecordComponent*>* components = ik->record_components(); 1900 assert(components != NULL, "components should not be NULL"); 1901 { 1902 JvmtiVMObjectAllocEventCollector oam; 1903 constantPoolHandle cp(THREAD, ik->constants()); 1904 int length = components->length(); 1905 assert(length >= 0, "unexpected record_components length"); 1906 objArrayOop record_components = 1907 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL); 1908 objArrayHandle components_h (THREAD, record_components); 1909 1910 for (int x = 0; x < length; x++) { 1911 RecordComponent* component = components->at(x); 1912 assert(component != NULL, "unexpected NULL record component"); 1913 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1914 components_h->obj_at_put(x, component_oop); 1915 } 1916 return (jobjectArray)JNIHandles::make_local(components_h()); 1917 } 1918 } 1919 1920 // Return empty array if ofClass is not a record. 1921 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL); 1922 return (jobjectArray)JNIHandles::make_local(env, result); 1923 } 1924 JVM_END 1925 1926 static bool select_method(const methodHandle& method, bool want_constructor) { 1927 if (want_constructor) { 1928 return (method->is_initializer() && !method->is_static()); 1929 } else { 1930 return (!method->is_initializer() && !method->is_overpass()); 1931 } 1932 } 1933 1934 static jobjectArray get_class_declared_methods_helper( 1935 JNIEnv *env, 1936 jclass ofClass, jboolean publicOnly, 1937 bool want_constructor, 1938 Klass* klass, TRAPS) { 1939 1940 JvmtiVMObjectAllocEventCollector oam; 1941 1942 // Exclude primitive types and array types 1943 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1944 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1945 // Return empty array 1946 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1947 return (jobjectArray) JNIHandles::make_local(env, res); 1948 } 1949 1950 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1951 1952 // Ensure class is linked 1953 k->link_class(CHECK_NULL); 1954 1955 Array<Method*>* methods = k->methods(); 1956 int methods_length = methods->length(); 1957 1958 // Save original method_idnum in case of redefinition, which can change 1959 // the idnum of obsolete methods. The new method will have the same idnum 1960 // but if we refresh the methods array, the counts will be wrong. 1961 ResourceMark rm(THREAD); 1962 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1963 int num_methods = 0; 1964 1965 for (int i = 0; i < methods_length; i++) { 1966 methodHandle method(THREAD, methods->at(i)); 1967 if (select_method(method, want_constructor)) { 1968 if (!publicOnly || method->is_public()) { 1969 idnums->push(method->method_idnum()); 1970 ++num_methods; 1971 } 1972 } 1973 } 1974 1975 // Allocate result 1976 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1977 objArrayHandle result (THREAD, r); 1978 1979 // Now just put the methods that we selected above, but go by their idnum 1980 // in case of redefinition. The methods can be redefined at any safepoint, 1981 // so above when allocating the oop array and below when creating reflect 1982 // objects. 1983 for (int i = 0; i < num_methods; i++) { 1984 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1985 if (method.is_null()) { 1986 // Method may have been deleted and seems this API can handle null 1987 // Otherwise should probably put a method that throws NSME 1988 result->obj_at_put(i, NULL); 1989 } else { 1990 oop m; 1991 if (want_constructor) { 1992 m = Reflection::new_constructor(method, CHECK_NULL); 1993 } else { 1994 m = Reflection::new_method(method, false, CHECK_NULL); 1995 } 1996 result->obj_at_put(i, m); 1997 } 1998 } 1999 2000 return (jobjectArray) JNIHandles::make_local(env, result()); 2001 } 2002 2003 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 2004 { 2005 JVMWrapper("JVM_GetClassDeclaredMethods"); 2006 return get_class_declared_methods_helper(env, ofClass, publicOnly, 2007 /*want_constructor*/ false, 2008 SystemDictionary::reflect_Method_klass(), THREAD); 2009 } 2010 JVM_END 2011 2012 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 2013 { 2014 JVMWrapper("JVM_GetClassDeclaredConstructors"); 2015 return get_class_declared_methods_helper(env, ofClass, publicOnly, 2016 /*want_constructor*/ true, 2017 SystemDictionary::reflect_Constructor_klass(), THREAD); 2018 } 2019 JVM_END 2020 2021 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 2022 { 2023 JVMWrapper("JVM_GetClassAccessFlags"); 2024 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 2025 // Primitive type 2026 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 2027 } 2028 2029 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2030 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 2031 } 2032 JVM_END 2033 2034 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 2035 { 2036 JVMWrapper("JVM_AreNestMates"); 2037 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2038 assert(c->is_instance_klass(), "must be"); 2039 InstanceKlass* ck = InstanceKlass::cast(c); 2040 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 2041 assert(m->is_instance_klass(), "must be"); 2042 InstanceKlass* mk = InstanceKlass::cast(m); 2043 return ck->has_nestmate_access_to(mk, THREAD); 2044 } 2045 JVM_END 2046 2047 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 2048 { 2049 // current is not a primitive or array class 2050 JVMWrapper("JVM_GetNestHost"); 2051 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2052 assert(c->is_instance_klass(), "must be"); 2053 InstanceKlass* ck = InstanceKlass::cast(c); 2054 // Don't post exceptions if validation fails 2055 InstanceKlass* host = ck->nest_host(NULL, THREAD); 2056 return (jclass) (host == NULL ? NULL : 2057 JNIHandles::make_local(THREAD, host->java_mirror())); 2058 } 2059 JVM_END 2060 2061 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 2062 { 2063 // current is not a primitive or array class 2064 JVMWrapper("JVM_GetNestMembers"); 2065 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2066 assert(c->is_instance_klass(), "must be"); 2067 InstanceKlass* ck = InstanceKlass::cast(c); 2068 // Get the nest host for this nest - throw ICCE if validation fails 2069 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError(); 2070 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL); 2071 2072 { 2073 JvmtiVMObjectAllocEventCollector oam; 2074 Array<u2>* members = host->nest_members(); 2075 int length = members == NULL ? 0 : members->length(); 2076 // nest host is first in the array so make it one bigger 2077 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 2078 length + 1, CHECK_NULL); 2079 objArrayHandle result (THREAD, r); 2080 result->obj_at_put(0, host->java_mirror()); 2081 if (length != 0) { 2082 int i; 2083 for (i = 0; i < length; i++) { 2084 int cp_index = members->at(i); 2085 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL); 2086 if (k->is_instance_klass()) { 2087 InstanceKlass* nest_host_k = 2088 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL); 2089 if (nest_host_k == host) { 2090 result->obj_at_put(i+1, k->java_mirror()); 2091 } 2092 else { 2093 // k's nest host is legal but it isn't our host so 2094 // throw ICCE 2095 ResourceMark rm(THREAD); 2096 Exceptions::fthrow(THREAD_AND_LOCATION, 2097 icce, 2098 "%s.getNestMembers: Nest member %s in %s declares a different nest host of %s", 2099 c->external_name(), 2100 k->external_name(), 2101 host->external_name(), 2102 nest_host_k->external_name() 2103 ); 2104 return NULL; 2105 } 2106 } 2107 else { 2108 // we have a bad nest member entry - throw ICCE 2109 ResourceMark rm(THREAD); 2110 Exceptions::fthrow(THREAD_AND_LOCATION, 2111 icce, 2112 "Class %s can not be a nest member of %s", 2113 k->external_name(), 2114 host->external_name() 2115 ); 2116 return NULL; 2117 } 2118 } 2119 } 2120 else { 2121 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate"); 2122 } 2123 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2124 } 2125 } 2126 JVM_END 2127 2128 // Constant pool access ////////////////////////////////////////////////////////// 2129 2130 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2131 { 2132 JVMWrapper("JVM_GetClassConstantPool"); 2133 JvmtiVMObjectAllocEventCollector oam; 2134 2135 // Return null for primitives and arrays 2136 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 2137 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2138 if (k->is_instance_klass()) { 2139 InstanceKlass* k_h = InstanceKlass::cast(k); 2140 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2141 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2142 return JNIHandles::make_local(jcp()); 2143 } 2144 } 2145 return NULL; 2146 } 2147 JVM_END 2148 2149 2150 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2151 { 2152 JVMWrapper("JVM_ConstantPoolGetSize"); 2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2154 return cp->length(); 2155 } 2156 JVM_END 2157 2158 2159 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2160 { 2161 JVMWrapper("JVM_ConstantPoolGetClassAt"); 2162 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2163 bounds_check(cp, index, CHECK_NULL); 2164 constantTag tag = cp->tag_at(index); 2165 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2166 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2167 } 2168 Klass* k = cp->klass_at(index, CHECK_NULL); 2169 return (jclass) JNIHandles::make_local(k->java_mirror()); 2170 } 2171 JVM_END 2172 2173 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2174 { 2175 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 2176 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2177 bounds_check(cp, index, CHECK_NULL); 2178 constantTag tag = cp->tag_at(index); 2179 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2180 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2181 } 2182 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2183 if (k == NULL) return NULL; 2184 return (jclass) JNIHandles::make_local(k->java_mirror()); 2185 } 2186 JVM_END 2187 2188 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2189 constantTag tag = cp->tag_at(index); 2190 if (!tag.is_method() && !tag.is_interface_method()) { 2191 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2192 } 2193 int klass_ref = cp->uncached_klass_ref_index_at(index); 2194 Klass* k_o; 2195 if (force_resolution) { 2196 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2197 } else { 2198 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2199 if (k_o == NULL) return NULL; 2200 } 2201 InstanceKlass* k = InstanceKlass::cast(k_o); 2202 Symbol* name = cp->uncached_name_ref_at(index); 2203 Symbol* sig = cp->uncached_signature_ref_at(index); 2204 methodHandle m (THREAD, k->find_method(name, sig)); 2205 if (m.is_null()) { 2206 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2207 } 2208 oop method; 2209 if (!m->is_initializer() || m->is_static()) { 2210 method = Reflection::new_method(m, true, CHECK_NULL); 2211 } else { 2212 method = Reflection::new_constructor(m, CHECK_NULL); 2213 } 2214 return JNIHandles::make_local(method); 2215 } 2216 2217 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2218 { 2219 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 2220 JvmtiVMObjectAllocEventCollector oam; 2221 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2222 bounds_check(cp, index, CHECK_NULL); 2223 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2224 return res; 2225 } 2226 JVM_END 2227 2228 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2229 { 2230 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2231 JvmtiVMObjectAllocEventCollector oam; 2232 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2233 bounds_check(cp, index, CHECK_NULL); 2234 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2235 return res; 2236 } 2237 JVM_END 2238 2239 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2240 constantTag tag = cp->tag_at(index); 2241 if (!tag.is_field()) { 2242 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2243 } 2244 int klass_ref = cp->uncached_klass_ref_index_at(index); 2245 Klass* k_o; 2246 if (force_resolution) { 2247 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2248 } else { 2249 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2250 if (k_o == NULL) return NULL; 2251 } 2252 InstanceKlass* k = InstanceKlass::cast(k_o); 2253 Symbol* name = cp->uncached_name_ref_at(index); 2254 Symbol* sig = cp->uncached_signature_ref_at(index); 2255 fieldDescriptor fd; 2256 Klass* target_klass = k->find_field(name, sig, &fd); 2257 if (target_klass == NULL) { 2258 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2259 } 2260 oop field = Reflection::new_field(&fd, CHECK_NULL); 2261 return JNIHandles::make_local(field); 2262 } 2263 2264 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2265 { 2266 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2267 JvmtiVMObjectAllocEventCollector oam; 2268 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2269 bounds_check(cp, index, CHECK_NULL); 2270 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2271 return res; 2272 } 2273 JVM_END 2274 2275 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2276 { 2277 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2278 JvmtiVMObjectAllocEventCollector oam; 2279 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2280 bounds_check(cp, index, CHECK_NULL); 2281 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2282 return res; 2283 } 2284 JVM_END 2285 2286 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2287 { 2288 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2289 JvmtiVMObjectAllocEventCollector oam; 2290 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2291 bounds_check(cp, index, CHECK_NULL); 2292 constantTag tag = cp->tag_at(index); 2293 if (!tag.is_field_or_method()) { 2294 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2295 } 2296 int klass_ref = cp->uncached_klass_ref_index_at(index); 2297 Symbol* klass_name = cp->klass_name_at(klass_ref); 2298 Symbol* member_name = cp->uncached_name_ref_at(index); 2299 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2300 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2301 objArrayHandle dest(THREAD, dest_o); 2302 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2303 dest->obj_at_put(0, str()); 2304 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2305 dest->obj_at_put(1, str()); 2306 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2307 dest->obj_at_put(2, str()); 2308 return (jobjectArray) JNIHandles::make_local(dest()); 2309 } 2310 JVM_END 2311 2312 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2313 { 2314 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2315 JvmtiVMObjectAllocEventCollector oam; 2316 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2317 bounds_check(cp, index, CHECK_0); 2318 constantTag tag = cp->tag_at(index); 2319 if (!tag.is_field_or_method()) { 2320 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2321 } 2322 return (jint) cp->uncached_klass_ref_index_at(index); 2323 } 2324 JVM_END 2325 2326 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2327 { 2328 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2329 JvmtiVMObjectAllocEventCollector oam; 2330 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2331 bounds_check(cp, index, CHECK_0); 2332 constantTag tag = cp->tag_at(index); 2333 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2334 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2335 } 2336 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2337 } 2338 JVM_END 2339 2340 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2341 { 2342 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2343 JvmtiVMObjectAllocEventCollector oam; 2344 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2345 bounds_check(cp, index, CHECK_NULL); 2346 constantTag tag = cp->tag_at(index); 2347 if (!tag.is_name_and_type()) { 2348 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2349 } 2350 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2351 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2352 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2353 objArrayHandle dest(THREAD, dest_o); 2354 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2355 dest->obj_at_put(0, str()); 2356 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2357 dest->obj_at_put(1, str()); 2358 return (jobjectArray) JNIHandles::make_local(dest()); 2359 } 2360 JVM_END 2361 2362 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2363 { 2364 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2365 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2366 bounds_check(cp, index, CHECK_0); 2367 constantTag tag = cp->tag_at(index); 2368 if (!tag.is_int()) { 2369 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2370 } 2371 return cp->int_at(index); 2372 } 2373 JVM_END 2374 2375 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2376 { 2377 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2378 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2379 bounds_check(cp, index, CHECK_(0L)); 2380 constantTag tag = cp->tag_at(index); 2381 if (!tag.is_long()) { 2382 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2383 } 2384 return cp->long_at(index); 2385 } 2386 JVM_END 2387 2388 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2389 { 2390 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2391 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2392 bounds_check(cp, index, CHECK_(0.0f)); 2393 constantTag tag = cp->tag_at(index); 2394 if (!tag.is_float()) { 2395 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2396 } 2397 return cp->float_at(index); 2398 } 2399 JVM_END 2400 2401 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2402 { 2403 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2404 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2405 bounds_check(cp, index, CHECK_(0.0)); 2406 constantTag tag = cp->tag_at(index); 2407 if (!tag.is_double()) { 2408 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2409 } 2410 return cp->double_at(index); 2411 } 2412 JVM_END 2413 2414 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2415 { 2416 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2417 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2418 bounds_check(cp, index, CHECK_NULL); 2419 constantTag tag = cp->tag_at(index); 2420 if (!tag.is_string()) { 2421 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2422 } 2423 oop str = cp->string_at(index, CHECK_NULL); 2424 return (jstring) JNIHandles::make_local(str); 2425 } 2426 JVM_END 2427 2428 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2429 { 2430 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2431 JvmtiVMObjectAllocEventCollector oam; 2432 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2433 bounds_check(cp, index, CHECK_NULL); 2434 constantTag tag = cp->tag_at(index); 2435 if (!tag.is_symbol()) { 2436 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2437 } 2438 Symbol* sym = cp->symbol_at(index); 2439 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2440 return (jstring) JNIHandles::make_local(str()); 2441 } 2442 JVM_END 2443 2444 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2445 { 2446 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2447 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2448 bounds_check(cp, index, CHECK_0); 2449 constantTag tag = cp->tag_at(index); 2450 jbyte result = tag.value(); 2451 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2452 // they are changed to the corresponding tags from the JVM spec, so that java code in 2453 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2454 if (tag.is_klass_or_reference()) { 2455 result = JVM_CONSTANT_Class; 2456 } else if (tag.is_string_index()) { 2457 result = JVM_CONSTANT_String; 2458 } else if (tag.is_method_type_in_error()) { 2459 result = JVM_CONSTANT_MethodType; 2460 } else if (tag.is_method_handle_in_error()) { 2461 result = JVM_CONSTANT_MethodHandle; 2462 } else if (tag.is_dynamic_constant_in_error()) { 2463 result = JVM_CONSTANT_Dynamic; 2464 } 2465 return result; 2466 } 2467 JVM_END 2468 2469 // Assertion support. ////////////////////////////////////////////////////////// 2470 2471 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2472 JVMWrapper("JVM_DesiredAssertionStatus"); 2473 assert(cls != NULL, "bad class"); 2474 2475 oop r = JNIHandles::resolve(cls); 2476 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2477 if (java_lang_Class::is_primitive(r)) return false; 2478 2479 Klass* k = java_lang_Class::as_Klass(r); 2480 assert(k->is_instance_klass(), "must be an instance klass"); 2481 if (!k->is_instance_klass()) return false; 2482 2483 ResourceMark rm(THREAD); 2484 const char* name = k->name()->as_C_string(); 2485 bool system_class = k->class_loader() == NULL; 2486 return JavaAssertions::enabled(name, system_class); 2487 2488 JVM_END 2489 2490 2491 // Return a new AssertionStatusDirectives object with the fields filled in with 2492 // command-line assertion arguments (i.e., -ea, -da). 2493 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2494 JVMWrapper("JVM_AssertionStatusDirectives"); 2495 JvmtiVMObjectAllocEventCollector oam; 2496 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2497 return JNIHandles::make_local(env, asd); 2498 JVM_END 2499 2500 // Verification //////////////////////////////////////////////////////////////////////////////// 2501 2502 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2503 2504 // RedefineClasses support: bug 6214132 caused verification to fail. 2505 // All functions from this section should call the jvmtiThreadSate function: 2506 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2507 // The function returns a Klass* of the _scratch_class if the verifier 2508 // was invoked in the middle of the class redefinition. 2509 // Otherwise it returns its argument value which is the _the_class Klass*. 2510 // Please, refer to the description in the jvmtiThreadSate.hpp. 2511 2512 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2513 JVMWrapper("JVM_GetClassNameUTF"); 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->name()->as_utf8(); 2517 JVM_END 2518 2519 2520 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2521 JVMWrapper("JVM_GetClassCPTypes"); 2522 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2523 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2524 // types will have length zero if this is not an InstanceKlass 2525 // (length is determined by call to JVM_GetClassCPEntriesCount) 2526 if (k->is_instance_klass()) { 2527 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2528 for (int index = cp->length() - 1; index >= 0; index--) { 2529 constantTag tag = cp->tag_at(index); 2530 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2531 } 2532 } 2533 JVM_END 2534 2535 2536 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2537 JVMWrapper("JVM_GetClassCPEntriesCount"); 2538 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2539 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2540 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2541 JVM_END 2542 2543 2544 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2545 JVMWrapper("JVM_GetClassFieldsCount"); 2546 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2547 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2548 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2549 JVM_END 2550 2551 2552 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2553 JVMWrapper("JVM_GetClassMethodsCount"); 2554 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2555 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2556 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2557 JVM_END 2558 2559 2560 // The following methods, used for the verifier, are never called with 2561 // array klasses, so a direct cast to InstanceKlass is safe. 2562 // Typically, these methods are called in a loop with bounds determined 2563 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2564 // zero for arrays. 2565 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2566 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2567 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2568 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2569 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2570 int length = method->checked_exceptions_length(); 2571 if (length > 0) { 2572 CheckedExceptionElement* table= method->checked_exceptions_start(); 2573 for (int i = 0; i < length; i++) { 2574 exceptions[i] = table[i].class_cp_index; 2575 } 2576 } 2577 JVM_END 2578 2579 2580 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2581 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2582 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2583 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2584 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2585 return method->checked_exceptions_length(); 2586 JVM_END 2587 2588 2589 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2590 JVMWrapper("JVM_GetMethodIxByteCode"); 2591 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2592 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2593 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2594 memcpy(code, method->code_base(), method->code_size()); 2595 JVM_END 2596 2597 2598 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2599 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2600 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2601 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2602 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2603 return method->code_size(); 2604 JVM_END 2605 2606 2607 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2608 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2609 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2610 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2611 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2612 ExceptionTable extable(method); 2613 entry->start_pc = extable.start_pc(entry_index); 2614 entry->end_pc = extable.end_pc(entry_index); 2615 entry->handler_pc = extable.handler_pc(entry_index); 2616 entry->catchType = extable.catch_type_index(entry_index); 2617 JVM_END 2618 2619 2620 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2621 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2622 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2623 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2624 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2625 return method->exception_table_length(); 2626 JVM_END 2627 2628 2629 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2630 JVMWrapper("JVM_GetMethodIxModifiers"); 2631 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2632 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2633 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2634 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2635 JVM_END 2636 2637 2638 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2639 JVMWrapper("JVM_GetFieldIxModifiers"); 2640 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2641 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2642 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2643 JVM_END 2644 2645 2646 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2647 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2648 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2649 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2650 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2651 return method->max_locals(); 2652 JVM_END 2653 2654 2655 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2656 JVMWrapper("JVM_GetMethodIxArgsSize"); 2657 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2658 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2659 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2660 return method->size_of_parameters(); 2661 JVM_END 2662 2663 2664 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2665 JVMWrapper("JVM_GetMethodIxMaxStack"); 2666 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2667 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2668 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2669 return method->verifier_max_stack(); 2670 JVM_END 2671 2672 2673 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2674 JVMWrapper("JVM_IsConstructorIx"); 2675 ResourceMark rm(THREAD); 2676 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2677 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2678 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2679 return method->name() == vmSymbols::object_initializer_name(); 2680 JVM_END 2681 2682 2683 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2684 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2685 ResourceMark rm(THREAD); 2686 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2687 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2688 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2689 return method->is_overpass(); 2690 JVM_END 2691 2692 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2693 JVMWrapper("JVM_GetMethodIxIxUTF"); 2694 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2695 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2696 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2697 return method->name()->as_utf8(); 2698 JVM_END 2699 2700 2701 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2702 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2703 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2704 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2705 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2706 return method->signature()->as_utf8(); 2707 JVM_END 2708 2709 /** 2710 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2711 * read entries in the constant pool. Since the old verifier always 2712 * works on a copy of the code, it will not see any rewriting that 2713 * may possibly occur in the middle of verification. So it is important 2714 * that nothing it calls tries to use the cpCache instead of the raw 2715 * constant pool, so we must use cp->uncached_x methods when appropriate. 2716 */ 2717 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2718 JVMWrapper("JVM_GetCPFieldNameUTF"); 2719 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2720 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2721 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2722 switch (cp->tag_at(cp_index).value()) { 2723 case JVM_CONSTANT_Fieldref: 2724 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2725 default: 2726 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2727 } 2728 ShouldNotReachHere(); 2729 return NULL; 2730 JVM_END 2731 2732 2733 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2734 JVMWrapper("JVM_GetCPMethodNameUTF"); 2735 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2736 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2737 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2738 switch (cp->tag_at(cp_index).value()) { 2739 case JVM_CONSTANT_InterfaceMethodref: 2740 case JVM_CONSTANT_Methodref: 2741 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2742 default: 2743 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2744 } 2745 ShouldNotReachHere(); 2746 return NULL; 2747 JVM_END 2748 2749 2750 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2751 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2752 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2753 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2754 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2755 switch (cp->tag_at(cp_index).value()) { 2756 case JVM_CONSTANT_InterfaceMethodref: 2757 case JVM_CONSTANT_Methodref: 2758 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2759 default: 2760 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2761 } 2762 ShouldNotReachHere(); 2763 return NULL; 2764 JVM_END 2765 2766 2767 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2768 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2769 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2770 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2771 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2772 switch (cp->tag_at(cp_index).value()) { 2773 case JVM_CONSTANT_Fieldref: 2774 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2775 default: 2776 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2777 } 2778 ShouldNotReachHere(); 2779 return NULL; 2780 JVM_END 2781 2782 2783 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2784 JVMWrapper("JVM_GetCPClassNameUTF"); 2785 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2786 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2787 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2788 Symbol* classname = cp->klass_name_at(cp_index); 2789 return classname->as_utf8(); 2790 JVM_END 2791 2792 2793 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2794 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2795 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2796 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2797 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2798 switch (cp->tag_at(cp_index).value()) { 2799 case JVM_CONSTANT_Fieldref: { 2800 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2801 Symbol* classname = cp->klass_name_at(class_index); 2802 return classname->as_utf8(); 2803 } 2804 default: 2805 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2806 } 2807 ShouldNotReachHere(); 2808 return NULL; 2809 JVM_END 2810 2811 2812 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2813 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2814 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2815 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, 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 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2821 Symbol* classname = cp->klass_name_at(class_index); 2822 return classname->as_utf8(); 2823 } 2824 default: 2825 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2826 } 2827 ShouldNotReachHere(); 2828 return NULL; 2829 JVM_END 2830 2831 2832 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2833 JVMWrapper("JVM_GetCPFieldModifiers"); 2834 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2835 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2836 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2837 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2838 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2839 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2840 switch (cp->tag_at(cp_index).value()) { 2841 case JVM_CONSTANT_Fieldref: { 2842 Symbol* name = cp->uncached_name_ref_at(cp_index); 2843 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2844 InstanceKlass* ik = InstanceKlass::cast(k_called); 2845 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2846 if (fs.name() == name && fs.signature() == signature) { 2847 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2848 } 2849 } 2850 return -1; 2851 } 2852 default: 2853 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2854 } 2855 ShouldNotReachHere(); 2856 return 0; 2857 JVM_END 2858 2859 2860 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2861 JVMWrapper("JVM_GetCPMethodModifiers"); 2862 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2863 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2864 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2865 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2866 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2867 switch (cp->tag_at(cp_index).value()) { 2868 case JVM_CONSTANT_Methodref: 2869 case JVM_CONSTANT_InterfaceMethodref: { 2870 Symbol* name = cp->uncached_name_ref_at(cp_index); 2871 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2872 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2873 int methods_count = methods->length(); 2874 for (int i = 0; i < methods_count; i++) { 2875 Method* method = methods->at(i); 2876 if (method->name() == name && method->signature() == signature) { 2877 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2878 } 2879 } 2880 return -1; 2881 } 2882 default: 2883 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2884 } 2885 ShouldNotReachHere(); 2886 return 0; 2887 JVM_END 2888 2889 2890 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2891 2892 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2893 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2894 JVM_END 2895 2896 2897 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2898 JVMWrapper("JVM_IsSameClassPackage"); 2899 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2900 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2901 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2902 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2903 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2904 JVM_END 2905 2906 // Printing support ////////////////////////////////////////////////// 2907 extern "C" { 2908 2909 ATTRIBUTE_PRINTF(3, 0) 2910 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2911 // Reject count values that are negative signed values converted to 2912 // unsigned; see bug 4399518, 4417214 2913 if ((intptr_t)count <= 0) return -1; 2914 2915 int result = os::vsnprintf(str, count, fmt, args); 2916 if (result > 0 && (size_t)result >= count) { 2917 result = -1; 2918 } 2919 2920 return result; 2921 } 2922 2923 ATTRIBUTE_PRINTF(3, 4) 2924 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2925 va_list args; 2926 int len; 2927 va_start(args, fmt); 2928 len = jio_vsnprintf(str, count, fmt, args); 2929 va_end(args); 2930 return len; 2931 } 2932 2933 ATTRIBUTE_PRINTF(2, 3) 2934 int jio_fprintf(FILE* f, const char *fmt, ...) { 2935 int len; 2936 va_list args; 2937 va_start(args, fmt); 2938 len = jio_vfprintf(f, fmt, args); 2939 va_end(args); 2940 return len; 2941 } 2942 2943 ATTRIBUTE_PRINTF(2, 0) 2944 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2945 if (Arguments::vfprintf_hook() != NULL) { 2946 return Arguments::vfprintf_hook()(f, fmt, args); 2947 } else { 2948 return vfprintf(f, fmt, args); 2949 } 2950 } 2951 2952 ATTRIBUTE_PRINTF(1, 2) 2953 JNIEXPORT int jio_printf(const char *fmt, ...) { 2954 int len; 2955 va_list args; 2956 va_start(args, fmt); 2957 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2958 va_end(args); 2959 return len; 2960 } 2961 2962 // HotSpot specific jio method 2963 void jio_print(const char* s, size_t len) { 2964 // Try to make this function as atomic as possible. 2965 if (Arguments::vfprintf_hook() != NULL) { 2966 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2967 } else { 2968 // Make an unused local variable to avoid warning from gcc compiler. 2969 size_t count = ::write(defaultStream::output_fd(), s, (int)len); 2970 } 2971 } 2972 2973 } // Extern C 2974 2975 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2976 2977 // In most of the JVM thread support functions we need to access the 2978 // thread through a ThreadsListHandle to prevent it from exiting and 2979 // being reclaimed while we try to operate on it. The exceptions to this 2980 // rule are when operating on the current thread, or if the monitor of 2981 // the target java.lang.Thread is locked at the Java level - in both 2982 // cases the target cannot exit. 2983 2984 static void thread_entry(JavaThread* thread, TRAPS) { 2985 HandleMark hm(THREAD); 2986 Handle obj(THREAD, thread->threadObj()); 2987 JavaValue result(T_VOID); 2988 JavaCalls::call_virtual(&result, 2989 obj, 2990 SystemDictionary::Thread_klass(), 2991 vmSymbols::run_method_name(), 2992 vmSymbols::void_method_signature(), 2993 THREAD); 2994 } 2995 2996 2997 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2998 JVMWrapper("JVM_StartThread"); 2999 JavaThread *native_thread = NULL; 3000 3001 // We cannot hold the Threads_lock when we throw an exception, 3002 // due to rank ordering issues. Example: we might need to grab the 3003 // Heap_lock while we construct the exception. 3004 bool throw_illegal_thread_state = false; 3005 3006 // We must release the Threads_lock before we can post a jvmti event 3007 // in Thread::start. 3008 { 3009 // Ensure that the C++ Thread and OSThread structures aren't freed before 3010 // we operate. 3011 MutexLocker mu(Threads_lock); 3012 3013 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 3014 // re-starting an already started thread, so we should usually find 3015 // that the JavaThread is null. However for a JNI attached thread 3016 // there is a small window between the Thread object being created 3017 // (with its JavaThread set) and the update to its threadStatus, so we 3018 // have to check for this 3019 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 3020 throw_illegal_thread_state = true; 3021 } else { 3022 // We could also check the stillborn flag to see if this thread was already stopped, but 3023 // for historical reasons we let the thread detect that itself when it starts running 3024 3025 jlong size = 3026 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 3027 // Allocate the C++ Thread structure and create the native thread. The 3028 // stack size retrieved from java is 64-bit signed, but the constructor takes 3029 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 3030 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 3031 // - Avoid passing negative values which would result in really large stacks. 3032 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 3033 size_t sz = size > 0 ? (size_t) size : 0; 3034 native_thread = new JavaThread(&thread_entry, sz); 3035 3036 // At this point it may be possible that no osthread was created for the 3037 // JavaThread due to lack of memory. Check for this situation and throw 3038 // an exception if necessary. Eventually we may want to change this so 3039 // that we only grab the lock if the thread was created successfully - 3040 // then we can also do this check and throw the exception in the 3041 // JavaThread constructor. 3042 if (native_thread->osthread() != NULL) { 3043 // Note: the current thread is not being used within "prepare". 3044 native_thread->prepare(jthread); 3045 } 3046 } 3047 } 3048 3049 if (throw_illegal_thread_state) { 3050 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3051 } 3052 3053 assert(native_thread != NULL, "Starting null thread?"); 3054 3055 if (native_thread->osthread() == NULL) { 3056 // No one should hold a reference to the 'native_thread'. 3057 native_thread->smr_delete(); 3058 if (JvmtiExport::should_post_resource_exhausted()) { 3059 JvmtiExport::post_resource_exhausted( 3060 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3061 os::native_thread_creation_failed_msg()); 3062 } 3063 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3064 os::native_thread_creation_failed_msg()); 3065 } 3066 3067 #if INCLUDE_JFR 3068 if (JfrRecorder::is_recording() && EventThreadStart::is_enabled() && 3069 EventThreadStart::is_stacktrace_enabled()) { 3070 JfrThreadLocal* tl = native_thread->jfr_thread_local(); 3071 // skip Thread.start() and Thread.start0() 3072 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2)); 3073 } 3074 #endif 3075 3076 Thread::start(native_thread); 3077 3078 JVM_END 3079 3080 3081 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 3082 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 3083 // but is thought to be reliable and simple. In the case, where the receiver is the 3084 // same thread as the sender, no VM_Operation is needed. 3085 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 3086 JVMWrapper("JVM_StopThread"); 3087 3088 // A nested ThreadsListHandle will grab the Threads_lock so create 3089 // tlh before we resolve throwable. 3090 ThreadsListHandle tlh(thread); 3091 oop java_throwable = JNIHandles::resolve(throwable); 3092 if (java_throwable == NULL) { 3093 THROW(vmSymbols::java_lang_NullPointerException()); 3094 } 3095 oop java_thread = NULL; 3096 JavaThread* receiver = NULL; 3097 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3098 Events::log_exception(thread, 3099 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 3100 p2i(receiver), p2i(java_thread), p2i(throwable)); 3101 3102 if (is_alive) { 3103 // jthread refers to a live JavaThread. 3104 if (thread == receiver) { 3105 // Exception is getting thrown at self so no VM_Operation needed. 3106 THROW_OOP(java_throwable); 3107 } else { 3108 // Use a VM_Operation to throw the exception. 3109 Thread::send_async_exception(java_thread, java_throwable); 3110 } 3111 } else { 3112 // Either: 3113 // - target thread has not been started before being stopped, or 3114 // - target thread already terminated 3115 // We could read the threadStatus to determine which case it is 3116 // but that is overkill as it doesn't matter. We must set the 3117 // stillborn flag for the first case, and if the thread has already 3118 // exited setting this flag has no effect. 3119 java_lang_Thread::set_stillborn(java_thread); 3120 } 3121 JVM_END 3122 3123 3124 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 3125 JVMWrapper("JVM_IsThreadAlive"); 3126 3127 oop thread_oop = JNIHandles::resolve_non_null(jthread); 3128 return java_lang_Thread::is_alive(thread_oop); 3129 JVM_END 3130 3131 3132 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 3133 JVMWrapper("JVM_SuspendThread"); 3134 3135 ThreadsListHandle tlh(thread); 3136 JavaThread* receiver = NULL; 3137 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3138 if (is_alive) { 3139 // jthread refers to a live JavaThread. 3140 { 3141 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 3142 if (receiver->is_external_suspend()) { 3143 // Don't allow nested external suspend requests. We can't return 3144 // an error from this interface so just ignore the problem. 3145 return; 3146 } 3147 if (receiver->is_exiting()) { // thread is in the process of exiting 3148 return; 3149 } 3150 receiver->set_external_suspend(); 3151 } 3152 3153 // java_suspend() will catch threads in the process of exiting 3154 // and will ignore them. 3155 receiver->java_suspend(); 3156 3157 // It would be nice to have the following assertion in all the 3158 // time, but it is possible for a racing resume request to have 3159 // resumed this thread right after we suspended it. Temporarily 3160 // enable this assertion if you are chasing a different kind of 3161 // bug. 3162 // 3163 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 3164 // receiver->is_being_ext_suspended(), "thread is not suspended"); 3165 } 3166 JVM_END 3167 3168 3169 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 3170 JVMWrapper("JVM_ResumeThread"); 3171 3172 ThreadsListHandle tlh(thread); 3173 JavaThread* receiver = NULL; 3174 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3175 if (is_alive) { 3176 // jthread refers to a live JavaThread. 3177 3178 // This is the original comment for this Threads_lock grab: 3179 // We need to *always* get the threads lock here, since this operation cannot be allowed during 3180 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 3181 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 3182 // looks at it. 3183 // 3184 // The above comment dates back to when we had both internal and 3185 // external suspend APIs that shared a common underlying mechanism. 3186 // External suspend is now entirely cooperative and doesn't share 3187 // anything with internal suspend. That said, there are some 3188 // assumptions in the VM that an external resume grabs the 3189 // Threads_lock. We can't drop the Threads_lock grab here until we 3190 // resolve the assumptions that exist elsewhere. 3191 // 3192 MutexLocker ml(Threads_lock); 3193 receiver->java_resume(); 3194 } 3195 JVM_END 3196 3197 3198 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3199 JVMWrapper("JVM_SetThreadPriority"); 3200 3201 ThreadsListHandle tlh(thread); 3202 oop java_thread = NULL; 3203 JavaThread* receiver = NULL; 3204 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3205 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3206 3207 if (is_alive) { 3208 // jthread refers to a live JavaThread. 3209 Thread::set_priority(receiver, (ThreadPriority)prio); 3210 } 3211 // Implied else: If the JavaThread hasn't started yet, then the 3212 // priority set in the java.lang.Thread object above will be pushed 3213 // down when it does start. 3214 JVM_END 3215 3216 3217 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3218 JVMWrapper("JVM_Yield"); 3219 if (os::dont_yield()) return; 3220 HOTSPOT_THREAD_YIELD(); 3221 os::naked_yield(); 3222 JVM_END 3223 3224 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) { 3225 assert(event != NULL, "invariant"); 3226 assert(event->should_commit(), "invariant"); 3227 event->set_time(millis); 3228 event->commit(); 3229 } 3230 3231 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3232 JVMWrapper("JVM_Sleep"); 3233 3234 if (millis < 0) { 3235 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3236 } 3237 3238 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3239 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3240 } 3241 3242 // Save current thread state and restore it at the end of this block. 3243 // And set new thread state to SLEEPING. 3244 JavaThreadSleepState jtss(thread); 3245 3246 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3247 EventThreadSleep event; 3248 3249 if (millis == 0) { 3250 os::naked_yield(); 3251 } else { 3252 ThreadState old_state = thread->osthread()->get_state(); 3253 thread->osthread()->set_state(SLEEPING); 3254 if (!thread->sleep(millis)) { // interrupted 3255 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3256 // us while we were sleeping. We do not overwrite those. 3257 if (!HAS_PENDING_EXCEPTION) { 3258 if (event.should_commit()) { 3259 post_thread_sleep_event(&event, millis); 3260 } 3261 HOTSPOT_THREAD_SLEEP_END(1); 3262 3263 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3264 // to properly restore the thread state. That's likely wrong. 3265 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3266 } 3267 } 3268 thread->osthread()->set_state(old_state); 3269 } 3270 if (event.should_commit()) { 3271 post_thread_sleep_event(&event, millis); 3272 } 3273 HOTSPOT_THREAD_SLEEP_END(0); 3274 JVM_END 3275 3276 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3277 JVMWrapper("JVM_CurrentThread"); 3278 oop jthread = thread->threadObj(); 3279 assert (thread != NULL, "no current thread!"); 3280 return JNIHandles::make_local(env, jthread); 3281 JVM_END 3282 3283 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3284 JVMWrapper("JVM_Interrupt"); 3285 3286 ThreadsListHandle tlh(thread); 3287 JavaThread* receiver = NULL; 3288 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3289 if (is_alive) { 3290 // jthread refers to a live JavaThread. 3291 receiver->interrupt(); 3292 } 3293 JVM_END 3294 3295 3296 // Return true iff the current thread has locked the object passed in 3297 3298 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3299 JVMWrapper("JVM_HoldsLock"); 3300 assert(THREAD->is_Java_thread(), "sanity check"); 3301 if (obj == NULL) { 3302 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3303 } 3304 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3305 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3306 JVM_END 3307 3308 3309 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3310 JVMWrapper("JVM_DumpAllStacks"); 3311 VM_PrintThreads op; 3312 VMThread::execute(&op); 3313 if (JvmtiExport::should_post_data_dump()) { 3314 JvmtiExport::post_data_dump(); 3315 } 3316 JVM_END 3317 3318 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3319 JVMWrapper("JVM_SetNativeThreadName"); 3320 3321 // We don't use a ThreadsListHandle here because the current thread 3322 // must be alive. 3323 oop java_thread = JNIHandles::resolve_non_null(jthread); 3324 JavaThread* thr = java_lang_Thread::thread(java_thread); 3325 if (thread == thr && !thr->has_attached_via_jni()) { 3326 // Thread naming is only supported for the current thread and 3327 // we don't set the name of an attached thread to avoid stepping 3328 // on other programs. 3329 ResourceMark rm(thread); 3330 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3331 os::set_native_thread_name(thread_name); 3332 } 3333 JVM_END 3334 3335 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3336 3337 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3338 JVMWrapper("JVM_GetClassContext"); 3339 ResourceMark rm(THREAD); 3340 JvmtiVMObjectAllocEventCollector oam; 3341 vframeStream vfst(thread); 3342 3343 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3344 // This must only be called from SecurityManager.getClassContext 3345 Method* m = vfst.method(); 3346 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3347 m->name() == vmSymbols::getClassContext_name() && 3348 m->signature() == vmSymbols::void_class_array_signature())) { 3349 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3350 } 3351 } 3352 3353 // Collect method holders 3354 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3355 for (; !vfst.at_end(); vfst.security_next()) { 3356 Method* m = vfst.method(); 3357 // Native frames are not returned 3358 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3359 Klass* holder = m->method_holder(); 3360 assert(holder->is_klass(), "just checking"); 3361 klass_array->append(holder); 3362 } 3363 } 3364 3365 // Create result array of type [Ljava/lang/Class; 3366 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3367 // Fill in mirrors corresponding to method holders 3368 for (int i = 0; i < klass_array->length(); i++) { 3369 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3370 } 3371 3372 return (jobjectArray) JNIHandles::make_local(env, result); 3373 JVM_END 3374 3375 3376 // java.lang.Package //////////////////////////////////////////////////////////////// 3377 3378 3379 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3380 JVMWrapper("JVM_GetSystemPackage"); 3381 ResourceMark rm(THREAD); 3382 JvmtiVMObjectAllocEventCollector oam; 3383 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3384 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3385 return (jstring) JNIHandles::make_local(result); 3386 JVM_END 3387 3388 3389 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3390 JVMWrapper("JVM_GetSystemPackages"); 3391 JvmtiVMObjectAllocEventCollector oam; 3392 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3393 return (jobjectArray) JNIHandles::make_local(result); 3394 JVM_END 3395 3396 3397 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3398 3399 3400 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3401 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3402 3403 MonitorLocker ml(Heap_lock); 3404 oop ref = Universe::reference_pending_list(); 3405 if (ref != NULL) { 3406 Universe::set_reference_pending_list(NULL); 3407 } 3408 return JNIHandles::make_local(env, ref); 3409 JVM_END 3410 3411 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3412 JVMWrapper("JVM_HasReferencePendingList"); 3413 MonitorLocker ml(Heap_lock); 3414 return Universe::has_reference_pending_list(); 3415 JVM_END 3416 3417 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3418 JVMWrapper("JVM_WaitForReferencePendingList"); 3419 MonitorLocker ml(Heap_lock); 3420 while (!Universe::has_reference_pending_list()) { 3421 ml.wait(); 3422 } 3423 JVM_END 3424 3425 3426 // ObjectInputStream /////////////////////////////////////////////////////////////// 3427 3428 // Return the first user-defined class loader up the execution stack, or null 3429 // if only code from the bootstrap or platform class loader is on the stack. 3430 3431 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3432 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3433 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3434 oop loader = vfst.method()->method_holder()->class_loader(); 3435 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3436 return JNIHandles::make_local(env, loader); 3437 } 3438 } 3439 return NULL; 3440 JVM_END 3441 3442 3443 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3444 3445 3446 // resolve array handle and check arguments 3447 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3448 if (arr == NULL) { 3449 THROW_0(vmSymbols::java_lang_NullPointerException()); 3450 } 3451 oop a = JNIHandles::resolve_non_null(arr); 3452 if (!a->is_array()) { 3453 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3454 } else if (type_array_only && !a->is_typeArray()) { 3455 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3456 } 3457 return arrayOop(a); 3458 } 3459 3460 3461 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3462 JVMWrapper("JVM_GetArrayLength"); 3463 arrayOop a = check_array(env, arr, false, CHECK_0); 3464 return a->length(); 3465 JVM_END 3466 3467 3468 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3469 JVMWrapper("JVM_Array_Get"); 3470 JvmtiVMObjectAllocEventCollector oam; 3471 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3472 jvalue value; 3473 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3474 oop box = Reflection::box(&value, type, CHECK_NULL); 3475 return JNIHandles::make_local(env, box); 3476 JVM_END 3477 3478 3479 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3480 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3481 jvalue value; 3482 value.i = 0; // to initialize value before getting used in CHECK 3483 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3484 assert(a->is_typeArray(), "just checking"); 3485 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3486 BasicType wide_type = (BasicType) wCode; 3487 if (type != wide_type) { 3488 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3489 } 3490 return value; 3491 JVM_END 3492 3493 3494 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3495 JVMWrapper("JVM_SetArrayElement"); 3496 arrayOop a = check_array(env, arr, false, CHECK); 3497 oop box = JNIHandles::resolve(val); 3498 jvalue value; 3499 value.i = 0; // to initialize value before getting used in CHECK 3500 BasicType value_type; 3501 if (a->is_objArray()) { 3502 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3503 value_type = Reflection::unbox_for_regular_object(box, &value); 3504 } else { 3505 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3506 } 3507 Reflection::array_set(&value, a, index, value_type, CHECK); 3508 JVM_END 3509 3510 3511 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3512 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3513 arrayOop a = check_array(env, arr, true, CHECK); 3514 assert(a->is_typeArray(), "just checking"); 3515 BasicType value_type = (BasicType) vCode; 3516 Reflection::array_set(&v, a, index, value_type, CHECK); 3517 JVM_END 3518 3519 3520 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3521 JVMWrapper("JVM_NewArray"); 3522 JvmtiVMObjectAllocEventCollector oam; 3523 oop element_mirror = JNIHandles::resolve(eltClass); 3524 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3525 return JNIHandles::make_local(env, result); 3526 JVM_END 3527 3528 3529 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3530 JVMWrapper("JVM_NewMultiArray"); 3531 JvmtiVMObjectAllocEventCollector oam; 3532 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3533 oop element_mirror = JNIHandles::resolve(eltClass); 3534 assert(dim_array->is_typeArray(), "just checking"); 3535 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3536 return JNIHandles::make_local(env, result); 3537 JVM_END 3538 3539 3540 // Library support /////////////////////////////////////////////////////////////////////////// 3541 3542 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3543 //%note jvm_ct 3544 JVMWrapper("JVM_LoadLibrary"); 3545 char ebuf[1024]; 3546 void *load_result; 3547 { 3548 ThreadToNativeFromVM ttnfvm(thread); 3549 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3550 } 3551 if (load_result == NULL) { 3552 char msg[1024]; 3553 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3554 // Since 'ebuf' may contain a string encoded using 3555 // platform encoding scheme, we need to pass 3556 // Exceptions::unsafe_to_utf8 to the new_exception method 3557 // as the last argument. See bug 6367357. 3558 Handle h_exception = 3559 Exceptions::new_exception(thread, 3560 vmSymbols::java_lang_UnsatisfiedLinkError(), 3561 msg, Exceptions::unsafe_to_utf8); 3562 3563 THROW_HANDLE_0(h_exception); 3564 } 3565 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3566 return load_result; 3567 JVM_END 3568 3569 3570 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3571 JVMWrapper("JVM_UnloadLibrary"); 3572 os::dll_unload(handle); 3573 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3574 JVM_END 3575 3576 3577 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3578 JVMWrapper("JVM_FindLibraryEntry"); 3579 void* find_result = os::dll_lookup(handle, name); 3580 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3581 find_result != NULL ? "Found" : "Failed to find", 3582 name, p2i(handle)); 3583 return find_result; 3584 JVM_END 3585 3586 3587 // JNI version /////////////////////////////////////////////////////////////////////////////// 3588 3589 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3590 JVMWrapper("JVM_IsSupportedJNIVersion"); 3591 return Threads::is_supported_jni_version_including_1_1(version); 3592 JVM_END 3593 3594 3595 // String support /////////////////////////////////////////////////////////////////////////// 3596 3597 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3598 JVMWrapper("JVM_InternString"); 3599 JvmtiVMObjectAllocEventCollector oam; 3600 if (str == NULL) return NULL; 3601 oop string = JNIHandles::resolve_non_null(str); 3602 oop result = StringTable::intern(string, CHECK_NULL); 3603 return (jstring) JNIHandles::make_local(env, result); 3604 JVM_END 3605 3606 3607 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3608 3609 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3610 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3611 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3612 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3613 // nature. JavaThreads will be "in native" when using this API from JDK code. 3614 3615 3616 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3617 VM_Exit::block_if_vm_exited(); 3618 JVMWrapper("JVM_RawMonitorCreate"); 3619 return new os::PlatformMutex(); 3620 } 3621 3622 3623 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3624 VM_Exit::block_if_vm_exited(); 3625 JVMWrapper("JVM_RawMonitorDestroy"); 3626 delete ((os::PlatformMutex*) mon); 3627 } 3628 3629 3630 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3631 VM_Exit::block_if_vm_exited(); 3632 JVMWrapper("JVM_RawMonitorEnter"); 3633 ((os::PlatformMutex*) mon)->lock(); 3634 return 0; 3635 } 3636 3637 3638 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3639 VM_Exit::block_if_vm_exited(); 3640 JVMWrapper("JVM_RawMonitorExit"); 3641 ((os::PlatformMutex*) mon)->unlock(); 3642 } 3643 3644 3645 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3646 3647 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3648 Handle loader, Handle protection_domain, 3649 jboolean throwError, TRAPS) { 3650 // Security Note: 3651 // The Java level wrapper will perform the necessary security check allowing 3652 // us to pass the NULL as the initiating class loader. The VM is responsible for 3653 // the checkPackageAccess relative to the initiating class loader via the 3654 // protection_domain. The protection_domain is passed as NULL by the java code 3655 // if there is no security manager in 3-arg Class.forName(). 3656 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3657 3658 // Check if we should initialize the class 3659 if (init && klass->is_instance_klass()) { 3660 klass->initialize(CHECK_NULL); 3661 } 3662 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3663 } 3664 3665 3666 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3667 3668 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3669 JVMWrapper("JVM_InvokeMethod"); 3670 Handle method_handle; 3671 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3672 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3673 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3674 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3675 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3676 jobject res = JNIHandles::make_local(env, result); 3677 if (JvmtiExport::should_post_vm_object_alloc()) { 3678 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3679 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3680 if (java_lang_Class::is_primitive(ret_type)) { 3681 // Only for primitive type vm allocates memory for java object. 3682 // See box() method. 3683 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3684 } 3685 } 3686 return res; 3687 } else { 3688 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3689 } 3690 JVM_END 3691 3692 3693 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3694 JVMWrapper("JVM_NewInstanceFromConstructor"); 3695 oop constructor_mirror = JNIHandles::resolve(c); 3696 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3697 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3698 jobject res = JNIHandles::make_local(env, result); 3699 if (JvmtiExport::should_post_vm_object_alloc()) { 3700 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3701 } 3702 return res; 3703 JVM_END 3704 3705 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3706 3707 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3708 JVMWrapper("JVM_SupportsCX8"); 3709 return VM_Version::supports_cx8(); 3710 JVM_END 3711 3712 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3713 JVMWrapper("JVM_InitializeFromArchive"); 3714 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3715 assert(k->is_klass(), "just checking"); 3716 HeapShared::initialize_from_archived_subgraph(k); 3717 JVM_END 3718 3719 // Returns an array of all live Thread objects (VM internal JavaThreads, 3720 // jvmti agent threads, and JNI attaching threads are skipped) 3721 // See CR 6404306 regarding JNI attaching threads 3722 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3723 ResourceMark rm(THREAD); 3724 ThreadsListEnumerator tle(THREAD, false, false); 3725 JvmtiVMObjectAllocEventCollector oam; 3726 3727 int num_threads = tle.num_threads(); 3728 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3729 objArrayHandle threads_ah(THREAD, r); 3730 3731 for (int i = 0; i < num_threads; i++) { 3732 Handle h = tle.get_threadObj(i); 3733 threads_ah->obj_at_put(i, h()); 3734 } 3735 3736 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3737 JVM_END 3738 3739 3740 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3741 // Return StackTraceElement[][], each element is the stack trace of a thread in 3742 // the corresponding entry in the given threads array 3743 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3744 JVMWrapper("JVM_DumpThreads"); 3745 JvmtiVMObjectAllocEventCollector oam; 3746 3747 // Check if threads is null 3748 if (threads == NULL) { 3749 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3750 } 3751 3752 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3753 objArrayHandle ah(THREAD, a); 3754 int num_threads = ah->length(); 3755 // check if threads is non-empty array 3756 if (num_threads == 0) { 3757 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3758 } 3759 3760 // check if threads is not an array of objects of Thread class 3761 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3762 if (k != SystemDictionary::Thread_klass()) { 3763 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3764 } 3765 3766 ResourceMark rm(THREAD); 3767 3768 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3769 for (int i = 0; i < num_threads; i++) { 3770 oop thread_obj = ah->obj_at(i); 3771 instanceHandle h(THREAD, (instanceOop) thread_obj); 3772 thread_handle_array->append(h); 3773 } 3774 3775 // The JavaThread references in thread_handle_array are validated 3776 // in VM_ThreadDump::doit(). 3777 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3778 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3779 3780 JVM_END 3781 3782 // JVM monitoring and management support 3783 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3784 return Management::get_jmm_interface(version); 3785 JVM_END 3786 3787 // com.sun.tools.attach.VirtualMachine agent properties support 3788 // 3789 // Initialize the agent properties with the properties maintained in the VM 3790 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3791 JVMWrapper("JVM_InitAgentProperties"); 3792 ResourceMark rm; 3793 3794 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3795 3796 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3797 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3798 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3799 return properties; 3800 JVM_END 3801 3802 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3803 { 3804 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3805 JvmtiVMObjectAllocEventCollector oam; 3806 3807 if (ofClass == NULL) { 3808 return NULL; 3809 } 3810 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3811 // Special handling for primitive objects 3812 if (java_lang_Class::is_primitive(mirror())) { 3813 return NULL; 3814 } 3815 Klass* k = java_lang_Class::as_Klass(mirror()); 3816 if (!k->is_instance_klass()) { 3817 return NULL; 3818 } 3819 InstanceKlass* ik = InstanceKlass::cast(k); 3820 int encl_method_class_idx = ik->enclosing_method_class_index(); 3821 if (encl_method_class_idx == 0) { 3822 return NULL; 3823 } 3824 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3825 objArrayHandle dest(THREAD, dest_o); 3826 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3827 dest->obj_at_put(0, enc_k->java_mirror()); 3828 int encl_method_method_idx = ik->enclosing_method_method_index(); 3829 if (encl_method_method_idx != 0) { 3830 Symbol* sym = ik->constants()->symbol_at( 3831 extract_low_short_from_int( 3832 ik->constants()->name_and_type_at(encl_method_method_idx))); 3833 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3834 dest->obj_at_put(1, str()); 3835 sym = ik->constants()->symbol_at( 3836 extract_high_short_from_int( 3837 ik->constants()->name_and_type_at(encl_method_method_idx))); 3838 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3839 dest->obj_at_put(2, str()); 3840 } 3841 return (jobjectArray) JNIHandles::make_local(dest()); 3842 } 3843 JVM_END 3844 3845 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3846 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3847 ResourceMark rm(THREAD); 3848 3849 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3850 return NULL; 3851 } 3852 3853 char** vm_flags = Arguments::jvm_flags_array(); 3854 char** vm_args = Arguments::jvm_args_array(); 3855 int num_flags = Arguments::num_jvm_flags(); 3856 int num_args = Arguments::num_jvm_args(); 3857 3858 InstanceKlass* ik = SystemDictionary::String_klass(); 3859 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3860 objArrayHandle result_h(THREAD, r); 3861 3862 int index = 0; 3863 for (int j = 0; j < num_flags; j++, index++) { 3864 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3865 result_h->obj_at_put(index, h()); 3866 } 3867 for (int i = 0; i < num_args; i++, index++) { 3868 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3869 result_h->obj_at_put(index, h()); 3870 } 3871 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3872 JVM_END 3873 3874 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3875 return os::get_signal_number(name); 3876 JVM_END