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 // Link all classes for dynamic CDS dumping before vm exit. 473 if (DynamicDumpSharedSpaces) { 474 MetaspaceShared::link_and_cleanup_shared_classes(THREAD); 475 } 476 EventShutdown event; 477 if (event.should_commit()) { 478 event.set_reason("Shutdown requested from Java"); 479 event.commit(); 480 } 481 JVM_END 482 483 484 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 485 before_exit(thread); 486 vm_exit(code); 487 JVM_END 488 489 490 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 491 JVMWrapper("JVM_GC"); 492 if (!DisableExplicitGC) { 493 Universe::heap()->collect(GCCause::_java_lang_system_gc); 494 } 495 JVM_END 496 497 498 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 499 JVMWrapper("JVM_MaxObjectInspectionAge"); 500 return Universe::heap()->millis_since_last_gc(); 501 JVM_END 502 503 504 static inline jlong convert_size_t_to_jlong(size_t val) { 505 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 506 NOT_LP64 (return (jlong)val;) 507 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 508 } 509 510 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 511 JVMWrapper("JVM_TotalMemory"); 512 size_t n = Universe::heap()->capacity(); 513 return convert_size_t_to_jlong(n); 514 JVM_END 515 516 517 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 518 JVMWrapper("JVM_FreeMemory"); 519 size_t n = Universe::heap()->unused(); 520 return convert_size_t_to_jlong(n); 521 JVM_END 522 523 524 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 525 JVMWrapper("JVM_MaxMemory"); 526 size_t n = Universe::heap()->max_capacity(); 527 return convert_size_t_to_jlong(n); 528 JVM_END 529 530 531 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 532 JVMWrapper("JVM_ActiveProcessorCount"); 533 return os::active_processor_count(); 534 JVM_END 535 536 537 538 // java.lang.Throwable ////////////////////////////////////////////////////// 539 540 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 541 JVMWrapper("JVM_FillInStackTrace"); 542 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 543 java_lang_Throwable::fill_in_stack_trace(exception); 544 JVM_END 545 546 // java.lang.NullPointerException /////////////////////////////////////////// 547 548 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 549 if (!ShowCodeDetailsInExceptionMessages) return NULL; 550 551 oop exc = JNIHandles::resolve_non_null(throwable); 552 553 Method* method; 554 int bci; 555 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 556 return NULL; 557 } 558 if (method->is_native()) { 559 return NULL; 560 } 561 562 stringStream ss; 563 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 564 if (ok) { 565 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 566 return (jstring) JNIHandles::make_local(env, result); 567 } else { 568 return NULL; 569 } 570 JVM_END 571 572 // java.lang.StackTraceElement ////////////////////////////////////////////// 573 574 575 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 576 JVMWrapper("JVM_InitStackTraceElementArray"); 577 Handle exception(THREAD, JNIHandles::resolve(throwable)); 578 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 579 objArrayHandle stack_trace(THREAD, st); 580 // Fill in the allocated stack trace 581 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 582 JVM_END 583 584 585 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 586 JVMWrapper("JVM_InitStackTraceElement"); 587 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 588 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 589 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 590 JVM_END 591 592 593 // java.lang.StackWalker ////////////////////////////////////////////////////// 594 595 596 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 597 jint skip_frames, jint frame_count, jint start_index, 598 jobjectArray frames)) 599 JVMWrapper("JVM_CallStackWalk"); 600 JavaThread* jt = (JavaThread*) THREAD; 601 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 602 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 603 } 604 605 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 606 607 // frames array is a Class<?>[] array when only getting caller reference, 608 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 609 // be null. 610 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 611 objArrayHandle frames_array_h(THREAD, fa); 612 613 int limit = start_index + frame_count; 614 if (frames_array_h->length() < limit) { 615 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 616 } 617 618 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 619 start_index, frames_array_h, CHECK_NULL); 620 return JNIHandles::make_local(env, result); 621 JVM_END 622 623 624 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 625 jint frame_count, jint start_index, 626 jobjectArray frames)) 627 JVMWrapper("JVM_MoreStackWalk"); 628 JavaThread* jt = (JavaThread*) THREAD; 629 630 // frames array is a Class<?>[] array when only getting caller reference, 631 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 632 // be null. 633 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 634 objArrayHandle frames_array_h(THREAD, fa); 635 636 int limit = start_index+frame_count; 637 if (frames_array_h->length() < limit) { 638 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 639 } 640 641 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 642 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 643 start_index, frames_array_h, THREAD); 644 JVM_END 645 646 // java.lang.Object /////////////////////////////////////////////// 647 648 649 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 650 JVMWrapper("JVM_IHashCode"); 651 // as implemented in the classic virtual machine; return 0 if object is NULL 652 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 653 JVM_END 654 655 656 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 657 JVMWrapper("JVM_MonitorWait"); 658 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 659 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 660 if (JvmtiExport::should_post_monitor_wait()) { 661 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 662 663 // The current thread already owns the monitor and it has not yet 664 // been added to the wait queue so the current thread cannot be 665 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 666 // event handler cannot accidentally consume an unpark() meant for 667 // the ParkEvent associated with this ObjectMonitor. 668 } 669 ObjectSynchronizer::wait(obj, ms, CHECK); 670 JVM_END 671 672 673 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 674 JVMWrapper("JVM_MonitorNotify"); 675 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 676 ObjectSynchronizer::notify(obj, CHECK); 677 JVM_END 678 679 680 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 681 JVMWrapper("JVM_MonitorNotifyAll"); 682 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 683 ObjectSynchronizer::notifyall(obj, CHECK); 684 JVM_END 685 686 687 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 688 JVMWrapper("JVM_Clone"); 689 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 690 Klass* klass = obj->klass(); 691 JvmtiVMObjectAllocEventCollector oam; 692 693 #ifdef ASSERT 694 // Just checking that the cloneable flag is set correct 695 if (obj->is_array()) { 696 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 697 } else { 698 guarantee(obj->is_instance(), "should be instanceOop"); 699 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 700 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 701 } 702 #endif 703 704 // Check if class of obj supports the Cloneable interface. 705 // All arrays are considered to be cloneable (See JLS 20.1.5). 706 // All j.l.r.Reference classes are considered non-cloneable. 707 if (!klass->is_cloneable() || 708 (klass->is_instance_klass() && 709 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 710 ResourceMark rm(THREAD); 711 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 712 } 713 714 // Make shallow object copy 715 const int size = obj->size(); 716 oop new_obj_oop = NULL; 717 if (obj->is_array()) { 718 const int length = ((arrayOop)obj())->length(); 719 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 720 /* do_zero */ true, CHECK_NULL); 721 } else { 722 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 723 } 724 725 HeapAccess<>::clone(obj(), new_obj_oop, size); 726 727 Handle new_obj(THREAD, new_obj_oop); 728 // Caution: this involves a java upcall, so the clone should be 729 // "gc-robust" by this stage. 730 if (klass->has_finalizer()) { 731 assert(obj->is_instance(), "should be instanceOop"); 732 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 733 new_obj = Handle(THREAD, new_obj_oop); 734 } 735 736 return JNIHandles::make_local(env, new_obj()); 737 JVM_END 738 739 // java.io.File /////////////////////////////////////////////////////////////// 740 741 JVM_LEAF(char*, JVM_NativePath(char* path)) 742 JVMWrapper("JVM_NativePath"); 743 return os::native_path(path); 744 JVM_END 745 746 747 // Misc. class handling /////////////////////////////////////////////////////////// 748 749 750 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 751 JVMWrapper("JVM_GetCallerClass"); 752 753 // Getting the class of the caller frame. 754 // 755 // The call stack at this point looks something like this: 756 // 757 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 758 // [1] [ @CallerSensitive API.method ] 759 // [.] [ (skipped intermediate frames) ] 760 // [n] [ caller ] 761 vframeStream vfst(thread); 762 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 763 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 764 Method* m = vfst.method(); 765 assert(m != NULL, "sanity"); 766 switch (n) { 767 case 0: 768 // This must only be called from Reflection.getCallerClass 769 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 770 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 771 } 772 // fall-through 773 case 1: 774 // Frame 0 and 1 must be caller sensitive. 775 if (!m->caller_sensitive()) { 776 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 777 } 778 break; 779 default: 780 if (!m->is_ignored_by_security_stack_walk()) { 781 // We have reached the desired frame; return the holder class. 782 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 783 } 784 break; 785 } 786 } 787 return NULL; 788 JVM_END 789 790 791 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 792 JVMWrapper("JVM_FindPrimitiveClass"); 793 oop mirror = NULL; 794 BasicType t = name2type(utf); 795 if (t != T_ILLEGAL && !is_reference_type(t)) { 796 mirror = Universe::java_mirror(t); 797 } 798 if (mirror == NULL) { 799 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 800 } else { 801 return (jclass) JNIHandles::make_local(env, mirror); 802 } 803 JVM_END 804 805 806 // Returns a class loaded by the bootstrap class loader; or null 807 // if not found. ClassNotFoundException is not thrown. 808 // FindClassFromBootLoader is exported to the launcher for windows. 809 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 810 const char* name)) 811 JVMWrapper("JVM_FindClassFromBootLoader"); 812 813 // Java libraries should ensure that name is never null... 814 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 815 // It's impossible to create this class; the name cannot fit 816 // into the constant pool. 817 return NULL; 818 } 819 820 TempNewSymbol h_name = SymbolTable::new_symbol(name); 821 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 822 if (k == NULL) { 823 return NULL; 824 } 825 826 if (log_is_enabled(Debug, class, resolve)) { 827 trace_class_resolution(k); 828 } 829 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 830 JVM_END 831 832 // Find a class with this name in this loader, using the caller's protection domain. 833 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 834 jboolean init, jobject loader, 835 jclass caller)) 836 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 837 // Java libraries should ensure that name is never null... 838 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 839 // It's impossible to create this class; the name cannot fit 840 // into the constant pool. 841 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 842 } 843 844 TempNewSymbol h_name = SymbolTable::new_symbol(name); 845 846 oop loader_oop = JNIHandles::resolve(loader); 847 oop from_class = JNIHandles::resolve(caller); 848 oop protection_domain = NULL; 849 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 850 // NPE. Put it in another way, the bootstrap class loader has all permission and 851 // thus no checkPackageAccess equivalence in the VM class loader. 852 // The caller is also passed as NULL by the java code if there is no security 853 // manager to avoid the performance cost of getting the calling class. 854 if (from_class != NULL && loader_oop != NULL) { 855 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 856 } 857 858 Handle h_loader(THREAD, loader_oop); 859 Handle h_prot(THREAD, protection_domain); 860 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 861 h_prot, false, THREAD); 862 863 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 864 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 865 } 866 return result; 867 JVM_END 868 869 // Currently only called from the old verifier. 870 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 871 jboolean init, jclass from)) 872 JVMWrapper("JVM_FindClassFromClass"); 873 if (name == NULL) { 874 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 875 } 876 if ((int)strlen(name) > Symbol::max_length()) { 877 // It's impossible to create this class; the name cannot fit 878 // into the constant pool. 879 Exceptions::fthrow(THREAD_AND_LOCATION, 880 vmSymbols::java_lang_NoClassDefFoundError(), 881 "Class name exceeds maximum length of %d: %s", 882 Symbol::max_length(), 883 name); 884 return 0; 885 } 886 TempNewSymbol h_name = SymbolTable::new_symbol(name); 887 oop from_class_oop = JNIHandles::resolve(from); 888 Klass* from_class = (from_class_oop == NULL) 889 ? (Klass*)NULL 890 : java_lang_Class::as_Klass(from_class_oop); 891 oop class_loader = NULL; 892 oop protection_domain = NULL; 893 if (from_class != NULL) { 894 class_loader = from_class->class_loader(); 895 protection_domain = from_class->protection_domain(); 896 } 897 Handle h_loader(THREAD, class_loader); 898 Handle h_prot (THREAD, protection_domain); 899 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 900 h_prot, true, thread); 901 902 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 903 // this function is generally only used for class loading during verification. 904 ResourceMark rm; 905 oop from_mirror = JNIHandles::resolve_non_null(from); 906 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 907 const char * from_name = from_class->external_name(); 908 909 oop mirror = JNIHandles::resolve_non_null(result); 910 Klass* to_class = java_lang_Class::as_Klass(mirror); 911 const char * to = to_class->external_name(); 912 log_debug(class, resolve)("%s %s (verification)", from_name, to); 913 } 914 915 return result; 916 JVM_END 917 918 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 919 if (loader.is_null()) { 920 return; 921 } 922 923 // check whether the current caller thread holds the lock or not. 924 // If not, increment the corresponding counter 925 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 926 ObjectSynchronizer::owner_self) { 927 counter->inc(); 928 } 929 } 930 931 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 932 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 933 jobject loader, const jbyte *buf, 934 jsize len, jobject pd, const char *source, 935 TRAPS) { 936 if (source == NULL) source = "__JVM_DefineClass__"; 937 938 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 939 JavaThread* jt = (JavaThread*) THREAD; 940 941 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 942 ClassLoader::perf_define_appclass_selftime(), 943 ClassLoader::perf_define_appclasses(), 944 jt->get_thread_stat()->perf_recursion_counts_addr(), 945 jt->get_thread_stat()->perf_timers_addr(), 946 PerfClassTraceTime::DEFINE_CLASS); 947 948 if (UsePerfData) { 949 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 950 } 951 952 // Since exceptions can be thrown, class initialization can take place 953 // if name is NULL no check for class name in .class stream has to be made. 954 TempNewSymbol class_name = NULL; 955 if (name != NULL) { 956 const int str_len = (int)strlen(name); 957 if (str_len > Symbol::max_length()) { 958 // It's impossible to create this class; the name cannot fit 959 // into the constant pool. 960 Exceptions::fthrow(THREAD_AND_LOCATION, 961 vmSymbols::java_lang_NoClassDefFoundError(), 962 "Class name exceeds maximum length of %d: %s", 963 Symbol::max_length(), 964 name); 965 return 0; 966 } 967 class_name = SymbolTable::new_symbol(name, str_len); 968 } 969 970 ResourceMark rm(THREAD); 971 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 972 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 973 if (UsePerfData) { 974 is_lock_held_by_thread(class_loader, 975 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 976 THREAD); 977 } 978 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 979 Klass* k = SystemDictionary::resolve_from_stream(class_name, 980 class_loader, 981 protection_domain, 982 &st, 983 CHECK_NULL); 984 985 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 986 trace_class_resolution(k); 987 } 988 989 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 990 } 991 992 993 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 994 JVMWrapper("JVM_DefineClass"); 995 996 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 997 JVM_END 998 999 1000 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1001 JVMWrapper("JVM_DefineClassWithSource"); 1002 1003 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 1004 JVM_END 1005 1006 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1007 JVMWrapper("JVM_FindLoadedClass"); 1008 ResourceMark rm(THREAD); 1009 1010 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1011 char* str = java_lang_String::as_utf8_string(h_name()); 1012 1013 // Sanity check, don't expect null 1014 if (str == NULL) return NULL; 1015 1016 // Internalize the string, converting '.' to '/' in string. 1017 char* p = (char*)str; 1018 while (*p != '\0') { 1019 if (*p == '.') { 1020 *p = '/'; 1021 } 1022 p++; 1023 } 1024 1025 const int str_len = (int)(p - str); 1026 if (str_len > Symbol::max_length()) { 1027 // It's impossible to create this class; the name cannot fit 1028 // into the constant pool. 1029 return NULL; 1030 } 1031 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1032 1033 // Security Note: 1034 // The Java level wrapper will perform the necessary security check allowing 1035 // us to pass the NULL as the initiating class loader. 1036 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1037 if (UsePerfData) { 1038 is_lock_held_by_thread(h_loader, 1039 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1040 THREAD); 1041 } 1042 1043 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1044 h_loader, 1045 Handle(), 1046 CHECK_NULL); 1047 #if INCLUDE_CDS 1048 if (k == NULL) { 1049 // If the class is not already loaded, try to see if it's in the shared 1050 // archive for the current classloader (h_loader). 1051 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1052 } 1053 #endif 1054 return (k == NULL) ? NULL : 1055 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1056 JVM_END 1057 1058 // Module support ////////////////////////////////////////////////////////////////////////////// 1059 1060 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1061 jstring location, const char* const* packages, jsize num_packages)) 1062 JVMWrapper("JVM_DefineModule"); 1063 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1064 JVM_END 1065 1066 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1067 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1068 Modules::set_bootloader_unnamed_module(module, CHECK); 1069 JVM_END 1070 1071 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1072 JVMWrapper("JVM_AddModuleExports"); 1073 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1074 JVM_END 1075 1076 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1077 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1078 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1079 JVM_END 1080 1081 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1082 JVMWrapper("JVM_AddModuleExportsToAll"); 1083 Modules::add_module_exports(from_module, package, NULL, CHECK); 1084 JVM_END 1085 1086 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1087 JVMWrapper("JVM_AddReadsModule"); 1088 Modules::add_reads_module(from_module, source_module, CHECK); 1089 JVM_END 1090 1091 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1092 1093 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1094 assert (cls != NULL, "illegal class"); 1095 JVMWrapper("JVM_InitClassName"); 1096 JvmtiVMObjectAllocEventCollector oam; 1097 ResourceMark rm(THREAD); 1098 HandleMark hm(THREAD); 1099 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1100 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1101 return (jstring) JNIHandles::make_local(env, result); 1102 JVM_END 1103 1104 1105 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1106 JVMWrapper("JVM_GetClassInterfaces"); 1107 JvmtiVMObjectAllocEventCollector oam; 1108 oop mirror = JNIHandles::resolve_non_null(cls); 1109 1110 // Special handling for primitive objects 1111 if (java_lang_Class::is_primitive(mirror)) { 1112 // Primitive objects does not have any interfaces 1113 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1114 return (jobjectArray) JNIHandles::make_local(env, r); 1115 } 1116 1117 Klass* klass = java_lang_Class::as_Klass(mirror); 1118 // Figure size of result array 1119 int size; 1120 if (klass->is_instance_klass()) { 1121 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1122 } else { 1123 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1124 size = 2; 1125 } 1126 1127 // Allocate result array 1128 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1129 objArrayHandle result (THREAD, r); 1130 // Fill in result 1131 if (klass->is_instance_klass()) { 1132 // Regular instance klass, fill in all local interfaces 1133 for (int index = 0; index < size; index++) { 1134 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1135 result->obj_at_put(index, k->java_mirror()); 1136 } 1137 } else { 1138 // All arrays implement java.lang.Cloneable and java.io.Serializable 1139 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1140 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1141 } 1142 return (jobjectArray) JNIHandles::make_local(env, result()); 1143 JVM_END 1144 1145 1146 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1147 JVMWrapper("JVM_IsInterface"); 1148 oop mirror = JNIHandles::resolve_non_null(cls); 1149 if (java_lang_Class::is_primitive(mirror)) { 1150 return JNI_FALSE; 1151 } 1152 Klass* k = java_lang_Class::as_Klass(mirror); 1153 jboolean result = k->is_interface(); 1154 assert(!result || k->is_instance_klass(), 1155 "all interfaces are instance types"); 1156 // The compiler intrinsic for isInterface tests the 1157 // Klass::_access_flags bits in the same way. 1158 return result; 1159 JVM_END 1160 1161 1162 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1163 JVMWrapper("JVM_GetClassSigners"); 1164 JvmtiVMObjectAllocEventCollector oam; 1165 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1166 // There are no signers for primitive types 1167 return NULL; 1168 } 1169 1170 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls))); 1171 1172 // If there are no signers set in the class, or if the class 1173 // is an array, return NULL. 1174 if (signers == NULL) return NULL; 1175 1176 // copy of the signers array 1177 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1178 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1179 for (int index = 0; index < signers->length(); index++) { 1180 signers_copy->obj_at_put(index, signers->obj_at(index)); 1181 } 1182 1183 // return the copy 1184 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1185 JVM_END 1186 1187 1188 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1189 JVMWrapper("JVM_SetClassSigners"); 1190 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1191 // This call is ignored for primitive types and arrays. 1192 // Signers are only set once, ClassLoader.java, and thus shouldn't 1193 // be called with an array. Only the bootstrap loader creates arrays. 1194 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1195 if (k->is_instance_klass()) { 1196 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1197 } 1198 } 1199 JVM_END 1200 1201 1202 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1203 JVMWrapper("JVM_GetProtectionDomain"); 1204 if (JNIHandles::resolve(cls) == NULL) { 1205 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1206 } 1207 1208 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1209 // Primitive types does not have a protection domain. 1210 return NULL; 1211 } 1212 1213 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1214 return (jobject) JNIHandles::make_local(env, pd); 1215 JVM_END 1216 1217 1218 // Returns the inherited_access_control_context field of the running thread. 1219 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1220 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1221 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1222 return JNIHandles::make_local(env, result); 1223 JVM_END 1224 1225 class RegisterArrayForGC { 1226 private: 1227 JavaThread *_thread; 1228 public: 1229 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1230 _thread = thread; 1231 _thread->register_array_for_gc(array); 1232 } 1233 1234 ~RegisterArrayForGC() { 1235 _thread->register_array_for_gc(NULL); 1236 } 1237 }; 1238 1239 1240 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1241 JVMWrapper("JVM_GetStackAccessControlContext"); 1242 if (!UsePrivilegedStack) return NULL; 1243 1244 ResourceMark rm(THREAD); 1245 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1246 JvmtiVMObjectAllocEventCollector oam; 1247 1248 // count the protection domains on the execution stack. We collapse 1249 // duplicate consecutive protection domains into a single one, as 1250 // well as stopping when we hit a privileged frame. 1251 1252 oop previous_protection_domain = NULL; 1253 Handle privileged_context(thread, NULL); 1254 bool is_privileged = false; 1255 oop protection_domain = NULL; 1256 1257 // Iterate through Java frames 1258 vframeStream vfst(thread); 1259 for(; !vfst.at_end(); vfst.next()) { 1260 // get method of frame 1261 Method* method = vfst.method(); 1262 1263 // stop at the first privileged frame 1264 if (method->method_holder() == SystemDictionary::AccessController_klass() && 1265 method->name() == vmSymbols::executePrivileged_name()) 1266 { 1267 // this frame is privileged 1268 is_privileged = true; 1269 1270 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1271 1272 StackValueCollection* locals = priv->locals(); 1273 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1274 StackValue* clr_sv = locals->at(2); // Class<?> caller 1275 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1276 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1277 privileged_context = ctx_sv->get_obj(); 1278 Handle caller = clr_sv->get_obj(); 1279 1280 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1281 protection_domain = caller_klass->protection_domain(); 1282 } else { 1283 protection_domain = method->method_holder()->protection_domain(); 1284 } 1285 1286 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1287 local_array->push(protection_domain); 1288 previous_protection_domain = protection_domain; 1289 } 1290 1291 if (is_privileged) break; 1292 } 1293 1294 1295 // either all the domains on the stack were system domains, or 1296 // we had a privileged system domain 1297 if (local_array->is_empty()) { 1298 if (is_privileged && privileged_context.is_null()) return NULL; 1299 1300 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1301 return JNIHandles::make_local(env, result); 1302 } 1303 1304 // the resource area must be registered in case of a gc 1305 RegisterArrayForGC ragc(thread, local_array); 1306 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1307 local_array->length(), CHECK_NULL); 1308 objArrayHandle h_context(thread, context); 1309 for (int index = 0; index < local_array->length(); index++) { 1310 h_context->obj_at_put(index, local_array->at(index)); 1311 } 1312 1313 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1314 1315 return JNIHandles::make_local(env, result); 1316 JVM_END 1317 1318 1319 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1320 JVMWrapper("JVM_IsArrayClass"); 1321 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1322 return (k != NULL) && k->is_array_klass() ? true : false; 1323 JVM_END 1324 1325 1326 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1327 JVMWrapper("JVM_IsPrimitiveClass"); 1328 oop mirror = JNIHandles::resolve_non_null(cls); 1329 return (jboolean) java_lang_Class::is_primitive(mirror); 1330 JVM_END 1331 1332 1333 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1334 JVMWrapper("JVM_GetClassModifiers"); 1335 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1336 // Primitive type 1337 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1338 } 1339 1340 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1341 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1342 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1343 return k->modifier_flags(); 1344 JVM_END 1345 1346 1347 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1348 1349 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1350 JvmtiVMObjectAllocEventCollector oam; 1351 // ofClass is a reference to a java_lang_Class object. The mirror object 1352 // of an InstanceKlass 1353 1354 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1355 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1356 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1357 return (jobjectArray)JNIHandles::make_local(env, result); 1358 } 1359 1360 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1361 InnerClassesIterator iter(k); 1362 1363 if (iter.length() == 0) { 1364 // Neither an inner nor outer class 1365 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1366 return (jobjectArray)JNIHandles::make_local(env, result); 1367 } 1368 1369 // find inner class info 1370 constantPoolHandle cp(thread, k->constants()); 1371 int length = iter.length(); 1372 1373 // Allocate temp. result array 1374 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1375 objArrayHandle result (THREAD, r); 1376 int members = 0; 1377 1378 for (; !iter.done(); iter.next()) { 1379 int ioff = iter.inner_class_info_index(); 1380 int ooff = iter.outer_class_info_index(); 1381 1382 if (ioff != 0 && ooff != 0) { 1383 // Check to see if the name matches the class we're looking for 1384 // before attempting to find the class. 1385 if (cp->klass_name_at_matches(k, ooff)) { 1386 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1387 if (outer_klass == k) { 1388 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1389 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1390 1391 // Throws an exception if outer klass has not declared k as 1392 // an inner klass 1393 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1394 1395 result->obj_at_put(members, inner_klass->java_mirror()); 1396 members++; 1397 } 1398 } 1399 } 1400 } 1401 1402 if (members != length) { 1403 // Return array of right length 1404 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1405 for(int i = 0; i < members; i++) { 1406 res->obj_at_put(i, result->obj_at(i)); 1407 } 1408 return (jobjectArray)JNIHandles::make_local(env, res); 1409 } 1410 1411 return (jobjectArray)JNIHandles::make_local(env, result()); 1412 JVM_END 1413 1414 1415 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1416 { 1417 // ofClass is a reference to a java_lang_Class object. 1418 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1419 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1420 return NULL; 1421 } 1422 1423 bool inner_is_member = false; 1424 Klass* outer_klass 1425 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1426 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1427 if (outer_klass == NULL) return NULL; // already a top-level class 1428 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1429 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1430 } 1431 JVM_END 1432 1433 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1434 { 1435 oop mirror = JNIHandles::resolve_non_null(cls); 1436 if (java_lang_Class::is_primitive(mirror) || 1437 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1438 return NULL; 1439 } 1440 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1441 int ooff = 0, noff = 0; 1442 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1443 if (noff != 0) { 1444 constantPoolHandle i_cp(thread, k->constants()); 1445 Symbol* name = i_cp->symbol_at(noff); 1446 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1447 return (jstring) JNIHandles::make_local(env, str()); 1448 } 1449 } 1450 return NULL; 1451 } 1452 JVM_END 1453 1454 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1455 assert (cls != NULL, "illegal class"); 1456 JVMWrapper("JVM_GetClassSignature"); 1457 JvmtiVMObjectAllocEventCollector oam; 1458 ResourceMark rm(THREAD); 1459 // Return null for arrays and primatives 1460 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1461 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1462 if (k->is_instance_klass()) { 1463 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1464 if (sym == NULL) return NULL; 1465 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1466 return (jstring) JNIHandles::make_local(env, str()); 1467 } 1468 } 1469 return NULL; 1470 JVM_END 1471 1472 1473 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1474 assert (cls != NULL, "illegal class"); 1475 JVMWrapper("JVM_GetClassAnnotations"); 1476 1477 // Return null for arrays and primitives 1478 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1479 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1480 if (k->is_instance_klass()) { 1481 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1482 return (jbyteArray) JNIHandles::make_local(env, a); 1483 } 1484 } 1485 return NULL; 1486 JVM_END 1487 1488 1489 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1490 // some of this code was adapted from from jni_FromReflectedField 1491 1492 oop reflected = JNIHandles::resolve_non_null(field); 1493 oop mirror = java_lang_reflect_Field::clazz(reflected); 1494 Klass* k = java_lang_Class::as_Klass(mirror); 1495 int slot = java_lang_reflect_Field::slot(reflected); 1496 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1497 1498 InstanceKlass* ik = InstanceKlass::cast(k); 1499 intptr_t offset = ik->field_offset(slot); 1500 1501 if (modifiers & JVM_ACC_STATIC) { 1502 // for static fields we only look in the current class 1503 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1504 assert(false, "cannot find static field"); 1505 return false; 1506 } 1507 } else { 1508 // for instance fields we start with the current class and work 1509 // our way up through the superclass chain 1510 if (!ik->find_field_from_offset(offset, false, &fd)) { 1511 assert(false, "cannot find instance field"); 1512 return false; 1513 } 1514 } 1515 return true; 1516 } 1517 1518 static Method* jvm_get_method_common(jobject method) { 1519 // some of this code was adapted from from jni_FromReflectedMethod 1520 1521 oop reflected = JNIHandles::resolve_non_null(method); 1522 oop mirror = NULL; 1523 int slot = 0; 1524 1525 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1526 mirror = java_lang_reflect_Constructor::clazz(reflected); 1527 slot = java_lang_reflect_Constructor::slot(reflected); 1528 } else { 1529 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1530 "wrong type"); 1531 mirror = java_lang_reflect_Method::clazz(reflected); 1532 slot = java_lang_reflect_Method::slot(reflected); 1533 } 1534 Klass* k = java_lang_Class::as_Klass(mirror); 1535 1536 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1537 assert(m != NULL, "cannot find method"); 1538 return m; // caller has to deal with NULL in product mode 1539 } 1540 1541 /* Type use annotations support (JDK 1.8) */ 1542 1543 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1544 assert (cls != NULL, "illegal class"); 1545 JVMWrapper("JVM_GetClassTypeAnnotations"); 1546 ResourceMark rm(THREAD); 1547 // Return null for arrays and primitives 1548 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1549 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1550 if (k->is_instance_klass()) { 1551 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1552 if (type_annotations != NULL) { 1553 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1554 return (jbyteArray) JNIHandles::make_local(env, a); 1555 } 1556 } 1557 } 1558 return NULL; 1559 JVM_END 1560 1561 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1562 assert (method != NULL, "illegal method"); 1563 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1564 1565 // method is a handle to a java.lang.reflect.Method object 1566 Method* m = jvm_get_method_common(method); 1567 if (m == NULL) { 1568 return NULL; 1569 } 1570 1571 AnnotationArray* type_annotations = m->type_annotations(); 1572 if (type_annotations != NULL) { 1573 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1574 return (jbyteArray) JNIHandles::make_local(env, a); 1575 } 1576 1577 return NULL; 1578 JVM_END 1579 1580 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1581 assert (field != NULL, "illegal field"); 1582 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1583 1584 fieldDescriptor fd; 1585 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1586 if (!gotFd) { 1587 return NULL; 1588 } 1589 1590 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1591 JVM_END 1592 1593 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1594 if (!cp->is_within_bounds(index)) { 1595 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1596 } 1597 } 1598 1599 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1600 { 1601 JVMWrapper("JVM_GetMethodParameters"); 1602 // method is a handle to a java.lang.reflect.Method object 1603 Method* method_ptr = jvm_get_method_common(method); 1604 methodHandle mh (THREAD, method_ptr); 1605 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1606 const int num_params = mh->method_parameters_length(); 1607 1608 if (num_params < 0) { 1609 // A -1 return value from method_parameters_length means there is no 1610 // parameter data. Return null to indicate this to the reflection 1611 // API. 1612 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1613 return (jobjectArray)NULL; 1614 } else { 1615 // Otherwise, we return something up to reflection, even if it is 1616 // a zero-length array. Why? Because in some cases this can 1617 // trigger a MalformedParametersException. 1618 1619 // make sure all the symbols are properly formatted 1620 for (int i = 0; i < num_params; i++) { 1621 MethodParametersElement* params = mh->method_parameters_start(); 1622 int index = params[i].name_cp_index; 1623 constantPoolHandle cp(THREAD, mh->constants()); 1624 bounds_check(cp, index, CHECK_NULL); 1625 1626 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1627 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1628 "Wrong type at constant pool index"); 1629 } 1630 1631 } 1632 1633 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1634 objArrayHandle result (THREAD, result_oop); 1635 1636 for (int i = 0; i < num_params; i++) { 1637 MethodParametersElement* params = mh->method_parameters_start(); 1638 // For a 0 index, give a NULL symbol 1639 Symbol* sym = 0 != params[i].name_cp_index ? 1640 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1641 int flags = params[i].flags; 1642 oop param = Reflection::new_parameter(reflected_method, i, sym, 1643 flags, CHECK_NULL); 1644 result->obj_at_put(i, param); 1645 } 1646 return (jobjectArray)JNIHandles::make_local(env, result()); 1647 } 1648 } 1649 JVM_END 1650 1651 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1652 1653 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1654 { 1655 JVMWrapper("JVM_GetClassDeclaredFields"); 1656 JvmtiVMObjectAllocEventCollector oam; 1657 1658 // Exclude primitive types and array types 1659 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1660 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1661 // Return empty array 1662 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1663 return (jobjectArray) JNIHandles::make_local(env, res); 1664 } 1665 1666 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1667 constantPoolHandle cp(THREAD, k->constants()); 1668 1669 // Ensure class is linked 1670 k->link_class(CHECK_NULL); 1671 1672 // Allocate result 1673 int num_fields; 1674 1675 if (publicOnly) { 1676 num_fields = 0; 1677 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1678 if (fs.access_flags().is_public()) ++num_fields; 1679 } 1680 } else { 1681 num_fields = k->java_fields_count(); 1682 } 1683 1684 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1685 objArrayHandle result (THREAD, r); 1686 1687 int out_idx = 0; 1688 fieldDescriptor fd; 1689 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1690 if (!publicOnly || fs.access_flags().is_public()) { 1691 fd.reinitialize(k, fs.index()); 1692 oop field = Reflection::new_field(&fd, CHECK_NULL); 1693 result->obj_at_put(out_idx, field); 1694 ++out_idx; 1695 } 1696 } 1697 assert(out_idx == num_fields, "just checking"); 1698 return (jobjectArray) JNIHandles::make_local(env, result()); 1699 } 1700 JVM_END 1701 1702 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1703 { 1704 JVMWrapper("JVM_IsRecord"); 1705 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1706 if (k != NULL && k->is_instance_klass()) { 1707 InstanceKlass* ik = InstanceKlass::cast(k); 1708 return ik->is_record(); 1709 } else { 1710 return false; 1711 } 1712 } 1713 JVM_END 1714 1715 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1716 { 1717 JVMWrapper("JVM_GetRecordComponents"); 1718 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1719 assert(c->is_instance_klass(), "must be"); 1720 InstanceKlass* ik = InstanceKlass::cast(c); 1721 1722 if (ik->is_record()) { 1723 Array<RecordComponent*>* components = ik->record_components(); 1724 assert(components != NULL, "components should not be NULL"); 1725 { 1726 JvmtiVMObjectAllocEventCollector oam; 1727 constantPoolHandle cp(THREAD, ik->constants()); 1728 int length = components->length(); 1729 assert(length >= 0, "unexpected record_components length"); 1730 objArrayOop record_components = 1731 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL); 1732 objArrayHandle components_h (THREAD, record_components); 1733 1734 for (int x = 0; x < length; x++) { 1735 RecordComponent* component = components->at(x); 1736 assert(component != NULL, "unexpected NULL record component"); 1737 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1738 components_h->obj_at_put(x, component_oop); 1739 } 1740 return (jobjectArray)JNIHandles::make_local(components_h()); 1741 } 1742 } 1743 1744 // Return empty array if ofClass is not a record. 1745 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL); 1746 return (jobjectArray)JNIHandles::make_local(env, result); 1747 } 1748 JVM_END 1749 1750 static bool select_method(const methodHandle& method, bool want_constructor) { 1751 if (want_constructor) { 1752 return (method->is_initializer() && !method->is_static()); 1753 } else { 1754 return (!method->is_initializer() && !method->is_overpass()); 1755 } 1756 } 1757 1758 static jobjectArray get_class_declared_methods_helper( 1759 JNIEnv *env, 1760 jclass ofClass, jboolean publicOnly, 1761 bool want_constructor, 1762 Klass* klass, TRAPS) { 1763 1764 JvmtiVMObjectAllocEventCollector oam; 1765 1766 // Exclude primitive types and array types 1767 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1768 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1769 // Return empty array 1770 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1771 return (jobjectArray) JNIHandles::make_local(env, res); 1772 } 1773 1774 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1775 1776 // Ensure class is linked 1777 k->link_class(CHECK_NULL); 1778 1779 Array<Method*>* methods = k->methods(); 1780 int methods_length = methods->length(); 1781 1782 // Save original method_idnum in case of redefinition, which can change 1783 // the idnum of obsolete methods. The new method will have the same idnum 1784 // but if we refresh the methods array, the counts will be wrong. 1785 ResourceMark rm(THREAD); 1786 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1787 int num_methods = 0; 1788 1789 for (int i = 0; i < methods_length; i++) { 1790 methodHandle method(THREAD, methods->at(i)); 1791 if (select_method(method, want_constructor)) { 1792 if (!publicOnly || method->is_public()) { 1793 idnums->push(method->method_idnum()); 1794 ++num_methods; 1795 } 1796 } 1797 } 1798 1799 // Allocate result 1800 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1801 objArrayHandle result (THREAD, r); 1802 1803 // Now just put the methods that we selected above, but go by their idnum 1804 // in case of redefinition. The methods can be redefined at any safepoint, 1805 // so above when allocating the oop array and below when creating reflect 1806 // objects. 1807 for (int i = 0; i < num_methods; i++) { 1808 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1809 if (method.is_null()) { 1810 // Method may have been deleted and seems this API can handle null 1811 // Otherwise should probably put a method that throws NSME 1812 result->obj_at_put(i, NULL); 1813 } else { 1814 oop m; 1815 if (want_constructor) { 1816 m = Reflection::new_constructor(method, CHECK_NULL); 1817 } else { 1818 m = Reflection::new_method(method, false, CHECK_NULL); 1819 } 1820 result->obj_at_put(i, m); 1821 } 1822 } 1823 1824 return (jobjectArray) JNIHandles::make_local(env, result()); 1825 } 1826 1827 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1828 { 1829 JVMWrapper("JVM_GetClassDeclaredMethods"); 1830 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1831 /*want_constructor*/ false, 1832 SystemDictionary::reflect_Method_klass(), THREAD); 1833 } 1834 JVM_END 1835 1836 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1837 { 1838 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1839 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1840 /*want_constructor*/ true, 1841 SystemDictionary::reflect_Constructor_klass(), THREAD); 1842 } 1843 JVM_END 1844 1845 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1846 { 1847 JVMWrapper("JVM_GetClassAccessFlags"); 1848 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1849 // Primitive type 1850 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1851 } 1852 1853 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1854 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1855 } 1856 JVM_END 1857 1858 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1859 { 1860 JVMWrapper("JVM_AreNestMates"); 1861 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1862 assert(c->is_instance_klass(), "must be"); 1863 InstanceKlass* ck = InstanceKlass::cast(c); 1864 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 1865 assert(m->is_instance_klass(), "must be"); 1866 InstanceKlass* mk = InstanceKlass::cast(m); 1867 return ck->has_nestmate_access_to(mk, THREAD); 1868 } 1869 JVM_END 1870 1871 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1872 { 1873 // current is not a primitive or array class 1874 JVMWrapper("JVM_GetNestHost"); 1875 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1876 assert(c->is_instance_klass(), "must be"); 1877 InstanceKlass* ck = InstanceKlass::cast(c); 1878 // Don't post exceptions if validation fails 1879 InstanceKlass* host = ck->nest_host(NULL, THREAD); 1880 return (jclass) (host == NULL ? NULL : 1881 JNIHandles::make_local(THREAD, host->java_mirror())); 1882 } 1883 JVM_END 1884 1885 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1886 { 1887 // current is not a primitive or array class 1888 JVMWrapper("JVM_GetNestMembers"); 1889 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1890 assert(c->is_instance_klass(), "must be"); 1891 InstanceKlass* ck = InstanceKlass::cast(c); 1892 // Get the nest host for this nest - throw ICCE if validation fails 1893 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError(); 1894 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL); 1895 1896 { 1897 JvmtiVMObjectAllocEventCollector oam; 1898 Array<u2>* members = host->nest_members(); 1899 int length = members == NULL ? 0 : members->length(); 1900 // nest host is first in the array so make it one bigger 1901 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 1902 length + 1, CHECK_NULL); 1903 objArrayHandle result (THREAD, r); 1904 result->obj_at_put(0, host->java_mirror()); 1905 if (length != 0) { 1906 int i; 1907 for (i = 0; i < length; i++) { 1908 int cp_index = members->at(i); 1909 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL); 1910 if (k->is_instance_klass()) { 1911 InstanceKlass* nest_host_k = 1912 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL); 1913 if (nest_host_k == host) { 1914 result->obj_at_put(i+1, k->java_mirror()); 1915 } 1916 else { 1917 // k's nest host is legal but it isn't our host so 1918 // throw ICCE 1919 ResourceMark rm(THREAD); 1920 Exceptions::fthrow(THREAD_AND_LOCATION, 1921 icce, 1922 "Nest member %s in %s declares a different nest host of %s", 1923 k->external_name(), 1924 host->external_name(), 1925 nest_host_k->external_name() 1926 ); 1927 return NULL; 1928 } 1929 } 1930 else { 1931 // we have a bad nest member entry - throw ICCE 1932 ResourceMark rm(THREAD); 1933 Exceptions::fthrow(THREAD_AND_LOCATION, 1934 icce, 1935 "Class %s can not be a nest member of %s", 1936 k->external_name(), 1937 host->external_name() 1938 ); 1939 return NULL; 1940 } 1941 } 1942 } 1943 else { 1944 assert(host == ck, "must be singleton nest"); 1945 } 1946 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1947 } 1948 } 1949 JVM_END 1950 1951 // Constant pool access ////////////////////////////////////////////////////////// 1952 1953 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1954 { 1955 JVMWrapper("JVM_GetClassConstantPool"); 1956 JvmtiVMObjectAllocEventCollector oam; 1957 1958 // Return null for primitives and arrays 1959 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1960 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1961 if (k->is_instance_klass()) { 1962 InstanceKlass* k_h = InstanceKlass::cast(k); 1963 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1964 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1965 return JNIHandles::make_local(jcp()); 1966 } 1967 } 1968 return NULL; 1969 } 1970 JVM_END 1971 1972 1973 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1974 { 1975 JVMWrapper("JVM_ConstantPoolGetSize"); 1976 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1977 return cp->length(); 1978 } 1979 JVM_END 1980 1981 1982 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1983 { 1984 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1985 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1986 bounds_check(cp, index, CHECK_NULL); 1987 constantTag tag = cp->tag_at(index); 1988 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1989 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1990 } 1991 Klass* k = cp->klass_at(index, CHECK_NULL); 1992 return (jclass) JNIHandles::make_local(k->java_mirror()); 1993 } 1994 JVM_END 1995 1996 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1997 { 1998 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1999 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2000 bounds_check(cp, index, CHECK_NULL); 2001 constantTag tag = cp->tag_at(index); 2002 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2003 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2004 } 2005 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2006 if (k == NULL) return NULL; 2007 return (jclass) JNIHandles::make_local(k->java_mirror()); 2008 } 2009 JVM_END 2010 2011 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2012 constantTag tag = cp->tag_at(index); 2013 if (!tag.is_method() && !tag.is_interface_method()) { 2014 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2015 } 2016 int klass_ref = cp->uncached_klass_ref_index_at(index); 2017 Klass* k_o; 2018 if (force_resolution) { 2019 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2020 } else { 2021 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2022 if (k_o == NULL) return NULL; 2023 } 2024 InstanceKlass* k = InstanceKlass::cast(k_o); 2025 Symbol* name = cp->uncached_name_ref_at(index); 2026 Symbol* sig = cp->uncached_signature_ref_at(index); 2027 methodHandle m (THREAD, k->find_method(name, sig)); 2028 if (m.is_null()) { 2029 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2030 } 2031 oop method; 2032 if (!m->is_initializer() || m->is_static()) { 2033 method = Reflection::new_method(m, true, CHECK_NULL); 2034 } else { 2035 method = Reflection::new_constructor(m, CHECK_NULL); 2036 } 2037 return JNIHandles::make_local(method); 2038 } 2039 2040 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2041 { 2042 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 2043 JvmtiVMObjectAllocEventCollector oam; 2044 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2045 bounds_check(cp, index, CHECK_NULL); 2046 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2047 return res; 2048 } 2049 JVM_END 2050 2051 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2052 { 2053 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2054 JvmtiVMObjectAllocEventCollector oam; 2055 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2056 bounds_check(cp, index, CHECK_NULL); 2057 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2058 return res; 2059 } 2060 JVM_END 2061 2062 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2063 constantTag tag = cp->tag_at(index); 2064 if (!tag.is_field()) { 2065 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2066 } 2067 int klass_ref = cp->uncached_klass_ref_index_at(index); 2068 Klass* k_o; 2069 if (force_resolution) { 2070 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2071 } else { 2072 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2073 if (k_o == NULL) return NULL; 2074 } 2075 InstanceKlass* k = InstanceKlass::cast(k_o); 2076 Symbol* name = cp->uncached_name_ref_at(index); 2077 Symbol* sig = cp->uncached_signature_ref_at(index); 2078 fieldDescriptor fd; 2079 Klass* target_klass = k->find_field(name, sig, &fd); 2080 if (target_klass == NULL) { 2081 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2082 } 2083 oop field = Reflection::new_field(&fd, CHECK_NULL); 2084 return JNIHandles::make_local(field); 2085 } 2086 2087 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2088 { 2089 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2090 JvmtiVMObjectAllocEventCollector oam; 2091 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2092 bounds_check(cp, index, CHECK_NULL); 2093 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2094 return res; 2095 } 2096 JVM_END 2097 2098 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2099 { 2100 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2101 JvmtiVMObjectAllocEventCollector oam; 2102 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2103 bounds_check(cp, index, CHECK_NULL); 2104 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2105 return res; 2106 } 2107 JVM_END 2108 2109 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2110 { 2111 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2112 JvmtiVMObjectAllocEventCollector oam; 2113 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2114 bounds_check(cp, index, CHECK_NULL); 2115 constantTag tag = cp->tag_at(index); 2116 if (!tag.is_field_or_method()) { 2117 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2118 } 2119 int klass_ref = cp->uncached_klass_ref_index_at(index); 2120 Symbol* klass_name = cp->klass_name_at(klass_ref); 2121 Symbol* member_name = cp->uncached_name_ref_at(index); 2122 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2123 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2124 objArrayHandle dest(THREAD, dest_o); 2125 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2126 dest->obj_at_put(0, str()); 2127 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2128 dest->obj_at_put(1, str()); 2129 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2130 dest->obj_at_put(2, str()); 2131 return (jobjectArray) JNIHandles::make_local(dest()); 2132 } 2133 JVM_END 2134 2135 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2136 { 2137 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2138 JvmtiVMObjectAllocEventCollector oam; 2139 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2140 bounds_check(cp, index, CHECK_0); 2141 constantTag tag = cp->tag_at(index); 2142 if (!tag.is_field_or_method()) { 2143 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2144 } 2145 return (jint) cp->uncached_klass_ref_index_at(index); 2146 } 2147 JVM_END 2148 2149 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2150 { 2151 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2152 JvmtiVMObjectAllocEventCollector oam; 2153 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2154 bounds_check(cp, index, CHECK_0); 2155 constantTag tag = cp->tag_at(index); 2156 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2158 } 2159 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2160 } 2161 JVM_END 2162 2163 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2164 { 2165 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2166 JvmtiVMObjectAllocEventCollector oam; 2167 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2168 bounds_check(cp, index, CHECK_NULL); 2169 constantTag tag = cp->tag_at(index); 2170 if (!tag.is_name_and_type()) { 2171 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2172 } 2173 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2174 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2175 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2176 objArrayHandle dest(THREAD, dest_o); 2177 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2178 dest->obj_at_put(0, str()); 2179 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2180 dest->obj_at_put(1, str()); 2181 return (jobjectArray) JNIHandles::make_local(dest()); 2182 } 2183 JVM_END 2184 2185 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2186 { 2187 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2188 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2189 bounds_check(cp, index, CHECK_0); 2190 constantTag tag = cp->tag_at(index); 2191 if (!tag.is_int()) { 2192 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2193 } 2194 return cp->int_at(index); 2195 } 2196 JVM_END 2197 2198 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2199 { 2200 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2201 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2202 bounds_check(cp, index, CHECK_(0L)); 2203 constantTag tag = cp->tag_at(index); 2204 if (!tag.is_long()) { 2205 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2206 } 2207 return cp->long_at(index); 2208 } 2209 JVM_END 2210 2211 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2212 { 2213 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2214 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2215 bounds_check(cp, index, CHECK_(0.0f)); 2216 constantTag tag = cp->tag_at(index); 2217 if (!tag.is_float()) { 2218 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2219 } 2220 return cp->float_at(index); 2221 } 2222 JVM_END 2223 2224 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2225 { 2226 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2227 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2228 bounds_check(cp, index, CHECK_(0.0)); 2229 constantTag tag = cp->tag_at(index); 2230 if (!tag.is_double()) { 2231 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2232 } 2233 return cp->double_at(index); 2234 } 2235 JVM_END 2236 2237 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2238 { 2239 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2240 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2241 bounds_check(cp, index, CHECK_NULL); 2242 constantTag tag = cp->tag_at(index); 2243 if (!tag.is_string()) { 2244 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2245 } 2246 oop str = cp->string_at(index, CHECK_NULL); 2247 return (jstring) JNIHandles::make_local(str); 2248 } 2249 JVM_END 2250 2251 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2252 { 2253 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2254 JvmtiVMObjectAllocEventCollector oam; 2255 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2256 bounds_check(cp, index, CHECK_NULL); 2257 constantTag tag = cp->tag_at(index); 2258 if (!tag.is_symbol()) { 2259 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2260 } 2261 Symbol* sym = cp->symbol_at(index); 2262 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2263 return (jstring) JNIHandles::make_local(str()); 2264 } 2265 JVM_END 2266 2267 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2268 { 2269 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2270 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2271 bounds_check(cp, index, CHECK_0); 2272 constantTag tag = cp->tag_at(index); 2273 jbyte result = tag.value(); 2274 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2275 // they are changed to the corresponding tags from the JVM spec, so that java code in 2276 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2277 if (tag.is_klass_or_reference()) { 2278 result = JVM_CONSTANT_Class; 2279 } else if (tag.is_string_index()) { 2280 result = JVM_CONSTANT_String; 2281 } else if (tag.is_method_type_in_error()) { 2282 result = JVM_CONSTANT_MethodType; 2283 } else if (tag.is_method_handle_in_error()) { 2284 result = JVM_CONSTANT_MethodHandle; 2285 } else if (tag.is_dynamic_constant_in_error()) { 2286 result = JVM_CONSTANT_Dynamic; 2287 } 2288 return result; 2289 } 2290 JVM_END 2291 2292 // Assertion support. ////////////////////////////////////////////////////////// 2293 2294 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2295 JVMWrapper("JVM_DesiredAssertionStatus"); 2296 assert(cls != NULL, "bad class"); 2297 2298 oop r = JNIHandles::resolve(cls); 2299 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2300 if (java_lang_Class::is_primitive(r)) return false; 2301 2302 Klass* k = java_lang_Class::as_Klass(r); 2303 assert(k->is_instance_klass(), "must be an instance klass"); 2304 if (!k->is_instance_klass()) return false; 2305 2306 ResourceMark rm(THREAD); 2307 const char* name = k->name()->as_C_string(); 2308 bool system_class = k->class_loader() == NULL; 2309 return JavaAssertions::enabled(name, system_class); 2310 2311 JVM_END 2312 2313 2314 // Return a new AssertionStatusDirectives object with the fields filled in with 2315 // command-line assertion arguments (i.e., -ea, -da). 2316 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2317 JVMWrapper("JVM_AssertionStatusDirectives"); 2318 JvmtiVMObjectAllocEventCollector oam; 2319 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2320 return JNIHandles::make_local(env, asd); 2321 JVM_END 2322 2323 // Verification //////////////////////////////////////////////////////////////////////////////// 2324 2325 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2326 2327 // RedefineClasses support: bug 6214132 caused verification to fail. 2328 // All functions from this section should call the jvmtiThreadSate function: 2329 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2330 // The function returns a Klass* of the _scratch_class if the verifier 2331 // was invoked in the middle of the class redefinition. 2332 // Otherwise it returns its argument value which is the _the_class Klass*. 2333 // Please, refer to the description in the jvmtiThreadSate.hpp. 2334 2335 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2336 JVMWrapper("JVM_GetClassNameUTF"); 2337 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2338 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2339 return k->name()->as_utf8(); 2340 JVM_END 2341 2342 2343 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2344 JVMWrapper("JVM_GetClassCPTypes"); 2345 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2346 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2347 // types will have length zero if this is not an InstanceKlass 2348 // (length is determined by call to JVM_GetClassCPEntriesCount) 2349 if (k->is_instance_klass()) { 2350 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2351 for (int index = cp->length() - 1; index >= 0; index--) { 2352 constantTag tag = cp->tag_at(index); 2353 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2354 } 2355 } 2356 JVM_END 2357 2358 2359 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2360 JVMWrapper("JVM_GetClassCPEntriesCount"); 2361 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2362 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2363 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2364 JVM_END 2365 2366 2367 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2368 JVMWrapper("JVM_GetClassFieldsCount"); 2369 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2370 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2371 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2372 JVM_END 2373 2374 2375 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2376 JVMWrapper("JVM_GetClassMethodsCount"); 2377 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2378 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2379 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2380 JVM_END 2381 2382 2383 // The following methods, used for the verifier, are never called with 2384 // array klasses, so a direct cast to InstanceKlass is safe. 2385 // Typically, these methods are called in a loop with bounds determined 2386 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2387 // zero for arrays. 2388 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2389 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2390 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2391 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2392 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2393 int length = method->checked_exceptions_length(); 2394 if (length > 0) { 2395 CheckedExceptionElement* table= method->checked_exceptions_start(); 2396 for (int i = 0; i < length; i++) { 2397 exceptions[i] = table[i].class_cp_index; 2398 } 2399 } 2400 JVM_END 2401 2402 2403 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2404 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2405 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2406 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2407 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2408 return method->checked_exceptions_length(); 2409 JVM_END 2410 2411 2412 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2413 JVMWrapper("JVM_GetMethodIxByteCode"); 2414 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2415 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2416 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2417 memcpy(code, method->code_base(), method->code_size()); 2418 JVM_END 2419 2420 2421 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2422 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2423 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2424 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2425 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2426 return method->code_size(); 2427 JVM_END 2428 2429 2430 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2431 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2432 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2433 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2434 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2435 ExceptionTable extable(method); 2436 entry->start_pc = extable.start_pc(entry_index); 2437 entry->end_pc = extable.end_pc(entry_index); 2438 entry->handler_pc = extable.handler_pc(entry_index); 2439 entry->catchType = extable.catch_type_index(entry_index); 2440 JVM_END 2441 2442 2443 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2444 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2445 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2446 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2447 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2448 return method->exception_table_length(); 2449 JVM_END 2450 2451 2452 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2453 JVMWrapper("JVM_GetMethodIxModifiers"); 2454 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2455 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2456 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2457 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2458 JVM_END 2459 2460 2461 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2462 JVMWrapper("JVM_GetFieldIxModifiers"); 2463 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2464 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2465 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2466 JVM_END 2467 2468 2469 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2470 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2471 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2472 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2473 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2474 return method->max_locals(); 2475 JVM_END 2476 2477 2478 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2479 JVMWrapper("JVM_GetMethodIxArgsSize"); 2480 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2481 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2482 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2483 return method->size_of_parameters(); 2484 JVM_END 2485 2486 2487 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2488 JVMWrapper("JVM_GetMethodIxMaxStack"); 2489 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2490 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2491 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2492 return method->verifier_max_stack(); 2493 JVM_END 2494 2495 2496 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2497 JVMWrapper("JVM_IsConstructorIx"); 2498 ResourceMark rm(THREAD); 2499 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2500 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2501 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2502 return method->name() == vmSymbols::object_initializer_name(); 2503 JVM_END 2504 2505 2506 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2507 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2508 ResourceMark rm(THREAD); 2509 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2510 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2511 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2512 return method->is_overpass(); 2513 JVM_END 2514 2515 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2516 JVMWrapper("JVM_GetMethodIxIxUTF"); 2517 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2518 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2519 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2520 return method->name()->as_utf8(); 2521 JVM_END 2522 2523 2524 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2525 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2526 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2527 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2528 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2529 return method->signature()->as_utf8(); 2530 JVM_END 2531 2532 /** 2533 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2534 * read entries in the constant pool. Since the old verifier always 2535 * works on a copy of the code, it will not see any rewriting that 2536 * may possibly occur in the middle of verification. So it is important 2537 * that nothing it calls tries to use the cpCache instead of the raw 2538 * constant pool, so we must use cp->uncached_x methods when appropriate. 2539 */ 2540 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2541 JVMWrapper("JVM_GetCPFieldNameUTF"); 2542 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2543 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2544 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2545 switch (cp->tag_at(cp_index).value()) { 2546 case JVM_CONSTANT_Fieldref: 2547 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2548 default: 2549 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2550 } 2551 ShouldNotReachHere(); 2552 return NULL; 2553 JVM_END 2554 2555 2556 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2557 JVMWrapper("JVM_GetCPMethodNameUTF"); 2558 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2559 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2560 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2561 switch (cp->tag_at(cp_index).value()) { 2562 case JVM_CONSTANT_InterfaceMethodref: 2563 case JVM_CONSTANT_Methodref: 2564 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2565 default: 2566 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2567 } 2568 ShouldNotReachHere(); 2569 return NULL; 2570 JVM_END 2571 2572 2573 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2574 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2575 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2576 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2577 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2578 switch (cp->tag_at(cp_index).value()) { 2579 case JVM_CONSTANT_InterfaceMethodref: 2580 case JVM_CONSTANT_Methodref: 2581 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2582 default: 2583 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2584 } 2585 ShouldNotReachHere(); 2586 return NULL; 2587 JVM_END 2588 2589 2590 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2591 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2592 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2593 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2594 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2595 switch (cp->tag_at(cp_index).value()) { 2596 case JVM_CONSTANT_Fieldref: 2597 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2598 default: 2599 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2600 } 2601 ShouldNotReachHere(); 2602 return NULL; 2603 JVM_END 2604 2605 2606 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2607 JVMWrapper("JVM_GetCPClassNameUTF"); 2608 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2609 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2610 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2611 Symbol* classname = cp->klass_name_at(cp_index); 2612 return classname->as_utf8(); 2613 JVM_END 2614 2615 2616 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2617 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2618 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2619 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2620 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2621 switch (cp->tag_at(cp_index).value()) { 2622 case JVM_CONSTANT_Fieldref: { 2623 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2624 Symbol* classname = cp->klass_name_at(class_index); 2625 return classname->as_utf8(); 2626 } 2627 default: 2628 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2629 } 2630 ShouldNotReachHere(); 2631 return NULL; 2632 JVM_END 2633 2634 2635 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2636 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2637 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2638 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2639 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2640 switch (cp->tag_at(cp_index).value()) { 2641 case JVM_CONSTANT_Methodref: 2642 case JVM_CONSTANT_InterfaceMethodref: { 2643 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2644 Symbol* classname = cp->klass_name_at(class_index); 2645 return classname->as_utf8(); 2646 } 2647 default: 2648 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2649 } 2650 ShouldNotReachHere(); 2651 return NULL; 2652 JVM_END 2653 2654 2655 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2656 JVMWrapper("JVM_GetCPFieldModifiers"); 2657 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2658 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2659 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2660 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2661 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2662 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2663 switch (cp->tag_at(cp_index).value()) { 2664 case JVM_CONSTANT_Fieldref: { 2665 Symbol* name = cp->uncached_name_ref_at(cp_index); 2666 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2667 InstanceKlass* ik = InstanceKlass::cast(k_called); 2668 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2669 if (fs.name() == name && fs.signature() == signature) { 2670 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2671 } 2672 } 2673 return -1; 2674 } 2675 default: 2676 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2677 } 2678 ShouldNotReachHere(); 2679 return 0; 2680 JVM_END 2681 2682 2683 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2684 JVMWrapper("JVM_GetCPMethodModifiers"); 2685 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2686 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2687 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2688 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2689 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2690 switch (cp->tag_at(cp_index).value()) { 2691 case JVM_CONSTANT_Methodref: 2692 case JVM_CONSTANT_InterfaceMethodref: { 2693 Symbol* name = cp->uncached_name_ref_at(cp_index); 2694 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2695 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2696 int methods_count = methods->length(); 2697 for (int i = 0; i < methods_count; i++) { 2698 Method* method = methods->at(i); 2699 if (method->name() == name && method->signature() == signature) { 2700 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2701 } 2702 } 2703 return -1; 2704 } 2705 default: 2706 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2707 } 2708 ShouldNotReachHere(); 2709 return 0; 2710 JVM_END 2711 2712 2713 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2714 2715 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2716 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2717 JVM_END 2718 2719 2720 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2721 JVMWrapper("JVM_IsSameClassPackage"); 2722 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2723 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2724 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2725 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2726 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2727 JVM_END 2728 2729 // Printing support ////////////////////////////////////////////////// 2730 extern "C" { 2731 2732 ATTRIBUTE_PRINTF(3, 0) 2733 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2734 // Reject count values that are negative signed values converted to 2735 // unsigned; see bug 4399518, 4417214 2736 if ((intptr_t)count <= 0) return -1; 2737 2738 int result = os::vsnprintf(str, count, fmt, args); 2739 if (result > 0 && (size_t)result >= count) { 2740 result = -1; 2741 } 2742 2743 return result; 2744 } 2745 2746 ATTRIBUTE_PRINTF(3, 4) 2747 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2748 va_list args; 2749 int len; 2750 va_start(args, fmt); 2751 len = jio_vsnprintf(str, count, fmt, args); 2752 va_end(args); 2753 return len; 2754 } 2755 2756 ATTRIBUTE_PRINTF(2, 3) 2757 int jio_fprintf(FILE* f, const char *fmt, ...) { 2758 int len; 2759 va_list args; 2760 va_start(args, fmt); 2761 len = jio_vfprintf(f, fmt, args); 2762 va_end(args); 2763 return len; 2764 } 2765 2766 ATTRIBUTE_PRINTF(2, 0) 2767 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2768 if (Arguments::vfprintf_hook() != NULL) { 2769 return Arguments::vfprintf_hook()(f, fmt, args); 2770 } else { 2771 return vfprintf(f, fmt, args); 2772 } 2773 } 2774 2775 ATTRIBUTE_PRINTF(1, 2) 2776 JNIEXPORT int jio_printf(const char *fmt, ...) { 2777 int len; 2778 va_list args; 2779 va_start(args, fmt); 2780 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2781 va_end(args); 2782 return len; 2783 } 2784 2785 // HotSpot specific jio method 2786 void jio_print(const char* s, size_t len) { 2787 // Try to make this function as atomic as possible. 2788 if (Arguments::vfprintf_hook() != NULL) { 2789 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2790 } else { 2791 // Make an unused local variable to avoid warning from gcc compiler. 2792 size_t count = ::write(defaultStream::output_fd(), s, (int)len); 2793 } 2794 } 2795 2796 } // Extern C 2797 2798 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2799 2800 // In most of the JVM thread support functions we need to access the 2801 // thread through a ThreadsListHandle to prevent it from exiting and 2802 // being reclaimed while we try to operate on it. The exceptions to this 2803 // rule are when operating on the current thread, or if the monitor of 2804 // the target java.lang.Thread is locked at the Java level - in both 2805 // cases the target cannot exit. 2806 2807 static void thread_entry(JavaThread* thread, TRAPS) { 2808 HandleMark hm(THREAD); 2809 Handle obj(THREAD, thread->threadObj()); 2810 JavaValue result(T_VOID); 2811 JavaCalls::call_virtual(&result, 2812 obj, 2813 SystemDictionary::Thread_klass(), 2814 vmSymbols::run_method_name(), 2815 vmSymbols::void_method_signature(), 2816 THREAD); 2817 } 2818 2819 2820 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2821 JVMWrapper("JVM_StartThread"); 2822 JavaThread *native_thread = NULL; 2823 2824 // We cannot hold the Threads_lock when we throw an exception, 2825 // due to rank ordering issues. Example: we might need to grab the 2826 // Heap_lock while we construct the exception. 2827 bool throw_illegal_thread_state = false; 2828 2829 // We must release the Threads_lock before we can post a jvmti event 2830 // in Thread::start. 2831 { 2832 // Ensure that the C++ Thread and OSThread structures aren't freed before 2833 // we operate. 2834 MutexLocker mu(Threads_lock); 2835 2836 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2837 // re-starting an already started thread, so we should usually find 2838 // that the JavaThread is null. However for a JNI attached thread 2839 // there is a small window between the Thread object being created 2840 // (with its JavaThread set) and the update to its threadStatus, so we 2841 // have to check for this 2842 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2843 throw_illegal_thread_state = true; 2844 } else { 2845 // We could also check the stillborn flag to see if this thread was already stopped, but 2846 // for historical reasons we let the thread detect that itself when it starts running 2847 2848 jlong size = 2849 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2850 // Allocate the C++ Thread structure and create the native thread. The 2851 // stack size retrieved from java is 64-bit signed, but the constructor takes 2852 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2853 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2854 // - Avoid passing negative values which would result in really large stacks. 2855 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2856 size_t sz = size > 0 ? (size_t) size : 0; 2857 native_thread = new JavaThread(&thread_entry, sz); 2858 2859 // At this point it may be possible that no osthread was created for the 2860 // JavaThread due to lack of memory. Check for this situation and throw 2861 // an exception if necessary. Eventually we may want to change this so 2862 // that we only grab the lock if the thread was created successfully - 2863 // then we can also do this check and throw the exception in the 2864 // JavaThread constructor. 2865 if (native_thread->osthread() != NULL) { 2866 // Note: the current thread is not being used within "prepare". 2867 native_thread->prepare(jthread); 2868 } 2869 } 2870 } 2871 2872 if (throw_illegal_thread_state) { 2873 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2874 } 2875 2876 assert(native_thread != NULL, "Starting null thread?"); 2877 2878 if (native_thread->osthread() == NULL) { 2879 // No one should hold a reference to the 'native_thread'. 2880 native_thread->smr_delete(); 2881 if (JvmtiExport::should_post_resource_exhausted()) { 2882 JvmtiExport::post_resource_exhausted( 2883 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2884 os::native_thread_creation_failed_msg()); 2885 } 2886 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2887 os::native_thread_creation_failed_msg()); 2888 } 2889 2890 #if INCLUDE_JFR 2891 if (JfrRecorder::is_recording() && EventThreadStart::is_enabled() && 2892 EventThreadStart::is_stacktrace_enabled()) { 2893 JfrThreadLocal* tl = native_thread->jfr_thread_local(); 2894 // skip Thread.start() and Thread.start0() 2895 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2)); 2896 } 2897 #endif 2898 2899 Thread::start(native_thread); 2900 2901 JVM_END 2902 2903 2904 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2905 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2906 // but is thought to be reliable and simple. In the case, where the receiver is the 2907 // same thread as the sender, no VM_Operation is needed. 2908 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2909 JVMWrapper("JVM_StopThread"); 2910 2911 // A nested ThreadsListHandle will grab the Threads_lock so create 2912 // tlh before we resolve throwable. 2913 ThreadsListHandle tlh(thread); 2914 oop java_throwable = JNIHandles::resolve(throwable); 2915 if (java_throwable == NULL) { 2916 THROW(vmSymbols::java_lang_NullPointerException()); 2917 } 2918 oop java_thread = NULL; 2919 JavaThread* receiver = NULL; 2920 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2921 Events::log_exception(thread, 2922 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2923 p2i(receiver), p2i(java_thread), p2i(throwable)); 2924 2925 if (is_alive) { 2926 // jthread refers to a live JavaThread. 2927 if (thread == receiver) { 2928 // Exception is getting thrown at self so no VM_Operation needed. 2929 THROW_OOP(java_throwable); 2930 } else { 2931 // Use a VM_Operation to throw the exception. 2932 Thread::send_async_exception(java_thread, java_throwable); 2933 } 2934 } else { 2935 // Either: 2936 // - target thread has not been started before being stopped, or 2937 // - target thread already terminated 2938 // We could read the threadStatus to determine which case it is 2939 // but that is overkill as it doesn't matter. We must set the 2940 // stillborn flag for the first case, and if the thread has already 2941 // exited setting this flag has no effect. 2942 java_lang_Thread::set_stillborn(java_thread); 2943 } 2944 JVM_END 2945 2946 2947 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2948 JVMWrapper("JVM_IsThreadAlive"); 2949 2950 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2951 return java_lang_Thread::is_alive(thread_oop); 2952 JVM_END 2953 2954 2955 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2956 JVMWrapper("JVM_SuspendThread"); 2957 2958 ThreadsListHandle tlh(thread); 2959 JavaThread* receiver = NULL; 2960 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2961 if (is_alive) { 2962 // jthread refers to a live JavaThread. 2963 { 2964 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2965 if (receiver->is_external_suspend()) { 2966 // Don't allow nested external suspend requests. We can't return 2967 // an error from this interface so just ignore the problem. 2968 return; 2969 } 2970 if (receiver->is_exiting()) { // thread is in the process of exiting 2971 return; 2972 } 2973 receiver->set_external_suspend(); 2974 } 2975 2976 // java_suspend() will catch threads in the process of exiting 2977 // and will ignore them. 2978 receiver->java_suspend(); 2979 2980 // It would be nice to have the following assertion in all the 2981 // time, but it is possible for a racing resume request to have 2982 // resumed this thread right after we suspended it. Temporarily 2983 // enable this assertion if you are chasing a different kind of 2984 // bug. 2985 // 2986 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2987 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2988 } 2989 JVM_END 2990 2991 2992 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2993 JVMWrapper("JVM_ResumeThread"); 2994 2995 ThreadsListHandle tlh(thread); 2996 JavaThread* receiver = NULL; 2997 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2998 if (is_alive) { 2999 // jthread refers to a live JavaThread. 3000 3001 // This is the original comment for this Threads_lock grab: 3002 // We need to *always* get the threads lock here, since this operation cannot be allowed during 3003 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 3004 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 3005 // looks at it. 3006 // 3007 // The above comment dates back to when we had both internal and 3008 // external suspend APIs that shared a common underlying mechanism. 3009 // External suspend is now entirely cooperative and doesn't share 3010 // anything with internal suspend. That said, there are some 3011 // assumptions in the VM that an external resume grabs the 3012 // Threads_lock. We can't drop the Threads_lock grab here until we 3013 // resolve the assumptions that exist elsewhere. 3014 // 3015 MutexLocker ml(Threads_lock); 3016 receiver->java_resume(); 3017 } 3018 JVM_END 3019 3020 3021 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3022 JVMWrapper("JVM_SetThreadPriority"); 3023 3024 ThreadsListHandle tlh(thread); 3025 oop java_thread = NULL; 3026 JavaThread* receiver = NULL; 3027 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3028 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3029 3030 if (is_alive) { 3031 // jthread refers to a live JavaThread. 3032 Thread::set_priority(receiver, (ThreadPriority)prio); 3033 } 3034 // Implied else: If the JavaThread hasn't started yet, then the 3035 // priority set in the java.lang.Thread object above will be pushed 3036 // down when it does start. 3037 JVM_END 3038 3039 3040 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3041 JVMWrapper("JVM_Yield"); 3042 if (os::dont_yield()) return; 3043 HOTSPOT_THREAD_YIELD(); 3044 os::naked_yield(); 3045 JVM_END 3046 3047 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) { 3048 assert(event != NULL, "invariant"); 3049 assert(event->should_commit(), "invariant"); 3050 event->set_time(millis); 3051 event->commit(); 3052 } 3053 3054 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3055 JVMWrapper("JVM_Sleep"); 3056 3057 if (millis < 0) { 3058 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3059 } 3060 3061 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3062 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3063 } 3064 3065 // Save current thread state and restore it at the end of this block. 3066 // And set new thread state to SLEEPING. 3067 JavaThreadSleepState jtss(thread); 3068 3069 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3070 EventThreadSleep event; 3071 3072 if (millis == 0) { 3073 os::naked_yield(); 3074 } else { 3075 ThreadState old_state = thread->osthread()->get_state(); 3076 thread->osthread()->set_state(SLEEPING); 3077 if (!thread->sleep(millis)) { // interrupted 3078 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3079 // us while we were sleeping. We do not overwrite those. 3080 if (!HAS_PENDING_EXCEPTION) { 3081 if (event.should_commit()) { 3082 post_thread_sleep_event(&event, millis); 3083 } 3084 HOTSPOT_THREAD_SLEEP_END(1); 3085 3086 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3087 // to properly restore the thread state. That's likely wrong. 3088 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3089 } 3090 } 3091 thread->osthread()->set_state(old_state); 3092 } 3093 if (event.should_commit()) { 3094 post_thread_sleep_event(&event, millis); 3095 } 3096 HOTSPOT_THREAD_SLEEP_END(0); 3097 JVM_END 3098 3099 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3100 JVMWrapper("JVM_CurrentThread"); 3101 oop jthread = thread->threadObj(); 3102 assert (thread != NULL, "no current thread!"); 3103 return JNIHandles::make_local(env, jthread); 3104 JVM_END 3105 3106 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3107 JVMWrapper("JVM_Interrupt"); 3108 3109 ThreadsListHandle tlh(thread); 3110 JavaThread* receiver = NULL; 3111 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3112 if (is_alive) { 3113 // jthread refers to a live JavaThread. 3114 receiver->interrupt(); 3115 } 3116 JVM_END 3117 3118 3119 // Return true iff the current thread has locked the object passed in 3120 3121 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3122 JVMWrapper("JVM_HoldsLock"); 3123 assert(THREAD->is_Java_thread(), "sanity check"); 3124 if (obj == NULL) { 3125 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3126 } 3127 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3128 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3129 JVM_END 3130 3131 3132 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3133 JVMWrapper("JVM_DumpAllStacks"); 3134 VM_PrintThreads op; 3135 VMThread::execute(&op); 3136 if (JvmtiExport::should_post_data_dump()) { 3137 JvmtiExport::post_data_dump(); 3138 } 3139 JVM_END 3140 3141 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3142 JVMWrapper("JVM_SetNativeThreadName"); 3143 3144 // We don't use a ThreadsListHandle here because the current thread 3145 // must be alive. 3146 oop java_thread = JNIHandles::resolve_non_null(jthread); 3147 JavaThread* thr = java_lang_Thread::thread(java_thread); 3148 if (thread == thr && !thr->has_attached_via_jni()) { 3149 // Thread naming is only supported for the current thread and 3150 // we don't set the name of an attached thread to avoid stepping 3151 // on other programs. 3152 ResourceMark rm(thread); 3153 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3154 os::set_native_thread_name(thread_name); 3155 } 3156 JVM_END 3157 3158 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3159 3160 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3161 JVMWrapper("JVM_GetClassContext"); 3162 ResourceMark rm(THREAD); 3163 JvmtiVMObjectAllocEventCollector oam; 3164 vframeStream vfst(thread); 3165 3166 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3167 // This must only be called from SecurityManager.getClassContext 3168 Method* m = vfst.method(); 3169 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3170 m->name() == vmSymbols::getClassContext_name() && 3171 m->signature() == vmSymbols::void_class_array_signature())) { 3172 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3173 } 3174 } 3175 3176 // Collect method holders 3177 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3178 for (; !vfst.at_end(); vfst.security_next()) { 3179 Method* m = vfst.method(); 3180 // Native frames are not returned 3181 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3182 Klass* holder = m->method_holder(); 3183 assert(holder->is_klass(), "just checking"); 3184 klass_array->append(holder); 3185 } 3186 } 3187 3188 // Create result array of type [Ljava/lang/Class; 3189 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3190 // Fill in mirrors corresponding to method holders 3191 for (int i = 0; i < klass_array->length(); i++) { 3192 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3193 } 3194 3195 return (jobjectArray) JNIHandles::make_local(env, result); 3196 JVM_END 3197 3198 3199 // java.lang.Package //////////////////////////////////////////////////////////////// 3200 3201 3202 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3203 JVMWrapper("JVM_GetSystemPackage"); 3204 ResourceMark rm(THREAD); 3205 JvmtiVMObjectAllocEventCollector oam; 3206 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3207 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3208 return (jstring) JNIHandles::make_local(result); 3209 JVM_END 3210 3211 3212 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3213 JVMWrapper("JVM_GetSystemPackages"); 3214 JvmtiVMObjectAllocEventCollector oam; 3215 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3216 return (jobjectArray) JNIHandles::make_local(result); 3217 JVM_END 3218 3219 3220 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3221 3222 3223 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3224 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3225 3226 MonitorLocker ml(Heap_lock); 3227 oop ref = Universe::reference_pending_list(); 3228 if (ref != NULL) { 3229 Universe::set_reference_pending_list(NULL); 3230 } 3231 return JNIHandles::make_local(env, ref); 3232 JVM_END 3233 3234 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3235 JVMWrapper("JVM_HasReferencePendingList"); 3236 MonitorLocker ml(Heap_lock); 3237 return Universe::has_reference_pending_list(); 3238 JVM_END 3239 3240 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3241 JVMWrapper("JVM_WaitForReferencePendingList"); 3242 MonitorLocker ml(Heap_lock); 3243 while (!Universe::has_reference_pending_list()) { 3244 ml.wait(); 3245 } 3246 JVM_END 3247 3248 3249 // ObjectInputStream /////////////////////////////////////////////////////////////// 3250 3251 // Return the first user-defined class loader up the execution stack, or null 3252 // if only code from the bootstrap or platform class loader is on the stack. 3253 3254 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3255 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3256 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3257 oop loader = vfst.method()->method_holder()->class_loader(); 3258 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3259 return JNIHandles::make_local(env, loader); 3260 } 3261 } 3262 return NULL; 3263 JVM_END 3264 3265 3266 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3267 3268 3269 // resolve array handle and check arguments 3270 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3271 if (arr == NULL) { 3272 THROW_0(vmSymbols::java_lang_NullPointerException()); 3273 } 3274 oop a = JNIHandles::resolve_non_null(arr); 3275 if (!a->is_array()) { 3276 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3277 } else if (type_array_only && !a->is_typeArray()) { 3278 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3279 } 3280 return arrayOop(a); 3281 } 3282 3283 3284 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3285 JVMWrapper("JVM_GetArrayLength"); 3286 arrayOop a = check_array(env, arr, false, CHECK_0); 3287 return a->length(); 3288 JVM_END 3289 3290 3291 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3292 JVMWrapper("JVM_Array_Get"); 3293 JvmtiVMObjectAllocEventCollector oam; 3294 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3295 jvalue value; 3296 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3297 oop box = Reflection::box(&value, type, CHECK_NULL); 3298 return JNIHandles::make_local(env, box); 3299 JVM_END 3300 3301 3302 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3303 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3304 jvalue value; 3305 value.i = 0; // to initialize value before getting used in CHECK 3306 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3307 assert(a->is_typeArray(), "just checking"); 3308 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3309 BasicType wide_type = (BasicType) wCode; 3310 if (type != wide_type) { 3311 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3312 } 3313 return value; 3314 JVM_END 3315 3316 3317 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3318 JVMWrapper("JVM_SetArrayElement"); 3319 arrayOop a = check_array(env, arr, false, CHECK); 3320 oop box = JNIHandles::resolve(val); 3321 jvalue value; 3322 value.i = 0; // to initialize value before getting used in CHECK 3323 BasicType value_type; 3324 if (a->is_objArray()) { 3325 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3326 value_type = Reflection::unbox_for_regular_object(box, &value); 3327 } else { 3328 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3329 } 3330 Reflection::array_set(&value, a, index, value_type, CHECK); 3331 JVM_END 3332 3333 3334 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3335 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3336 arrayOop a = check_array(env, arr, true, CHECK); 3337 assert(a->is_typeArray(), "just checking"); 3338 BasicType value_type = (BasicType) vCode; 3339 Reflection::array_set(&v, a, index, value_type, CHECK); 3340 JVM_END 3341 3342 3343 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3344 JVMWrapper("JVM_NewArray"); 3345 JvmtiVMObjectAllocEventCollector oam; 3346 oop element_mirror = JNIHandles::resolve(eltClass); 3347 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3348 return JNIHandles::make_local(env, result); 3349 JVM_END 3350 3351 3352 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3353 JVMWrapper("JVM_NewMultiArray"); 3354 JvmtiVMObjectAllocEventCollector oam; 3355 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3356 oop element_mirror = JNIHandles::resolve(eltClass); 3357 assert(dim_array->is_typeArray(), "just checking"); 3358 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3359 return JNIHandles::make_local(env, result); 3360 JVM_END 3361 3362 3363 // Library support /////////////////////////////////////////////////////////////////////////// 3364 3365 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3366 //%note jvm_ct 3367 JVMWrapper("JVM_LoadLibrary"); 3368 char ebuf[1024]; 3369 void *load_result; 3370 { 3371 ThreadToNativeFromVM ttnfvm(thread); 3372 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3373 } 3374 if (load_result == NULL) { 3375 char msg[1024]; 3376 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3377 // Since 'ebuf' may contain a string encoded using 3378 // platform encoding scheme, we need to pass 3379 // Exceptions::unsafe_to_utf8 to the new_exception method 3380 // as the last argument. See bug 6367357. 3381 Handle h_exception = 3382 Exceptions::new_exception(thread, 3383 vmSymbols::java_lang_UnsatisfiedLinkError(), 3384 msg, Exceptions::unsafe_to_utf8); 3385 3386 THROW_HANDLE_0(h_exception); 3387 } 3388 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3389 return load_result; 3390 JVM_END 3391 3392 3393 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3394 JVMWrapper("JVM_UnloadLibrary"); 3395 os::dll_unload(handle); 3396 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3397 JVM_END 3398 3399 3400 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3401 JVMWrapper("JVM_FindLibraryEntry"); 3402 void* find_result = os::dll_lookup(handle, name); 3403 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3404 find_result != NULL ? "Found" : "Failed to find", 3405 name, p2i(handle)); 3406 return find_result; 3407 JVM_END 3408 3409 3410 // JNI version /////////////////////////////////////////////////////////////////////////////// 3411 3412 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3413 JVMWrapper("JVM_IsSupportedJNIVersion"); 3414 return Threads::is_supported_jni_version_including_1_1(version); 3415 JVM_END 3416 3417 3418 // String support /////////////////////////////////////////////////////////////////////////// 3419 3420 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3421 JVMWrapper("JVM_InternString"); 3422 JvmtiVMObjectAllocEventCollector oam; 3423 if (str == NULL) return NULL; 3424 oop string = JNIHandles::resolve_non_null(str); 3425 oop result = StringTable::intern(string, CHECK_NULL); 3426 return (jstring) JNIHandles::make_local(env, result); 3427 JVM_END 3428 3429 3430 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3431 3432 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3433 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3434 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3435 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3436 // nature. JavaThreads will be "in native" when using this API from JDK code. 3437 3438 3439 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3440 VM_Exit::block_if_vm_exited(); 3441 JVMWrapper("JVM_RawMonitorCreate"); 3442 return new os::PlatformMutex(); 3443 } 3444 3445 3446 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3447 VM_Exit::block_if_vm_exited(); 3448 JVMWrapper("JVM_RawMonitorDestroy"); 3449 delete ((os::PlatformMutex*) mon); 3450 } 3451 3452 3453 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3454 VM_Exit::block_if_vm_exited(); 3455 JVMWrapper("JVM_RawMonitorEnter"); 3456 ((os::PlatformMutex*) mon)->lock(); 3457 return 0; 3458 } 3459 3460 3461 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3462 VM_Exit::block_if_vm_exited(); 3463 JVMWrapper("JVM_RawMonitorExit"); 3464 ((os::PlatformMutex*) mon)->unlock(); 3465 } 3466 3467 3468 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3469 3470 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3471 Handle loader, Handle protection_domain, 3472 jboolean throwError, TRAPS) { 3473 // Security Note: 3474 // The Java level wrapper will perform the necessary security check allowing 3475 // us to pass the NULL as the initiating class loader. The VM is responsible for 3476 // the checkPackageAccess relative to the initiating class loader via the 3477 // protection_domain. The protection_domain is passed as NULL by the java code 3478 // if there is no security manager in 3-arg Class.forName(). 3479 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3480 3481 // Check if we should initialize the class 3482 if (init && klass->is_instance_klass()) { 3483 klass->initialize(CHECK_NULL); 3484 } 3485 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3486 } 3487 3488 3489 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3490 3491 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3492 JVMWrapper("JVM_InvokeMethod"); 3493 Handle method_handle; 3494 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3495 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3496 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3497 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3498 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3499 jobject res = JNIHandles::make_local(env, result); 3500 if (JvmtiExport::should_post_vm_object_alloc()) { 3501 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3502 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3503 if (java_lang_Class::is_primitive(ret_type)) { 3504 // Only for primitive type vm allocates memory for java object. 3505 // See box() method. 3506 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3507 } 3508 } 3509 return res; 3510 } else { 3511 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3512 } 3513 JVM_END 3514 3515 3516 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3517 JVMWrapper("JVM_NewInstanceFromConstructor"); 3518 oop constructor_mirror = JNIHandles::resolve(c); 3519 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3520 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3521 jobject res = JNIHandles::make_local(env, result); 3522 if (JvmtiExport::should_post_vm_object_alloc()) { 3523 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3524 } 3525 return res; 3526 JVM_END 3527 3528 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3529 3530 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3531 JVMWrapper("JVM_SupportsCX8"); 3532 return VM_Version::supports_cx8(); 3533 JVM_END 3534 3535 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3536 JVMWrapper("JVM_InitializeFromArchive"); 3537 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3538 assert(k->is_klass(), "just checking"); 3539 HeapShared::initialize_from_archived_subgraph(k); 3540 JVM_END 3541 3542 // Returns an array of all live Thread objects (VM internal JavaThreads, 3543 // jvmti agent threads, and JNI attaching threads are skipped) 3544 // See CR 6404306 regarding JNI attaching threads 3545 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3546 ResourceMark rm(THREAD); 3547 ThreadsListEnumerator tle(THREAD, false, false); 3548 JvmtiVMObjectAllocEventCollector oam; 3549 3550 int num_threads = tle.num_threads(); 3551 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3552 objArrayHandle threads_ah(THREAD, r); 3553 3554 for (int i = 0; i < num_threads; i++) { 3555 Handle h = tle.get_threadObj(i); 3556 threads_ah->obj_at_put(i, h()); 3557 } 3558 3559 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3560 JVM_END 3561 3562 3563 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3564 // Return StackTraceElement[][], each element is the stack trace of a thread in 3565 // the corresponding entry in the given threads array 3566 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3567 JVMWrapper("JVM_DumpThreads"); 3568 JvmtiVMObjectAllocEventCollector oam; 3569 3570 // Check if threads is null 3571 if (threads == NULL) { 3572 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3573 } 3574 3575 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3576 objArrayHandle ah(THREAD, a); 3577 int num_threads = ah->length(); 3578 // check if threads is non-empty array 3579 if (num_threads == 0) { 3580 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3581 } 3582 3583 // check if threads is not an array of objects of Thread class 3584 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3585 if (k != SystemDictionary::Thread_klass()) { 3586 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3587 } 3588 3589 ResourceMark rm(THREAD); 3590 3591 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3592 for (int i = 0; i < num_threads; i++) { 3593 oop thread_obj = ah->obj_at(i); 3594 instanceHandle h(THREAD, (instanceOop) thread_obj); 3595 thread_handle_array->append(h); 3596 } 3597 3598 // The JavaThread references in thread_handle_array are validated 3599 // in VM_ThreadDump::doit(). 3600 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3601 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3602 3603 JVM_END 3604 3605 // JVM monitoring and management support 3606 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3607 return Management::get_jmm_interface(version); 3608 JVM_END 3609 3610 // com.sun.tools.attach.VirtualMachine agent properties support 3611 // 3612 // Initialize the agent properties with the properties maintained in the VM 3613 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3614 JVMWrapper("JVM_InitAgentProperties"); 3615 ResourceMark rm; 3616 3617 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3618 3619 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3620 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3621 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3622 return properties; 3623 JVM_END 3624 3625 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3626 { 3627 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3628 JvmtiVMObjectAllocEventCollector oam; 3629 3630 if (ofClass == NULL) { 3631 return NULL; 3632 } 3633 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3634 // Special handling for primitive objects 3635 if (java_lang_Class::is_primitive(mirror())) { 3636 return NULL; 3637 } 3638 Klass* k = java_lang_Class::as_Klass(mirror()); 3639 if (!k->is_instance_klass()) { 3640 return NULL; 3641 } 3642 InstanceKlass* ik = InstanceKlass::cast(k); 3643 int encl_method_class_idx = ik->enclosing_method_class_index(); 3644 if (encl_method_class_idx == 0) { 3645 return NULL; 3646 } 3647 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3648 objArrayHandle dest(THREAD, dest_o); 3649 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3650 dest->obj_at_put(0, enc_k->java_mirror()); 3651 int encl_method_method_idx = ik->enclosing_method_method_index(); 3652 if (encl_method_method_idx != 0) { 3653 Symbol* sym = ik->constants()->symbol_at( 3654 extract_low_short_from_int( 3655 ik->constants()->name_and_type_at(encl_method_method_idx))); 3656 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3657 dest->obj_at_put(1, str()); 3658 sym = ik->constants()->symbol_at( 3659 extract_high_short_from_int( 3660 ik->constants()->name_and_type_at(encl_method_method_idx))); 3661 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3662 dest->obj_at_put(2, str()); 3663 } 3664 return (jobjectArray) JNIHandles::make_local(dest()); 3665 } 3666 JVM_END 3667 3668 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3669 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3670 ResourceMark rm(THREAD); 3671 3672 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3673 return NULL; 3674 } 3675 3676 char** vm_flags = Arguments::jvm_flags_array(); 3677 char** vm_args = Arguments::jvm_args_array(); 3678 int num_flags = Arguments::num_jvm_flags(); 3679 int num_args = Arguments::num_jvm_args(); 3680 3681 InstanceKlass* ik = SystemDictionary::String_klass(); 3682 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3683 objArrayHandle result_h(THREAD, r); 3684 3685 int index = 0; 3686 for (int j = 0; j < num_flags; j++, index++) { 3687 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3688 result_h->obj_at_put(index, h()); 3689 } 3690 for (int i = 0; i < num_args; i++, index++) { 3691 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3692 result_h->obj_at_put(index, h()); 3693 } 3694 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3695 JVM_END 3696 3697 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3698 return os::get_signal_number(name); 3699 JVM_END