1 /* 2 * Copyright (c) 1997, 2019, 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.hpp" 52 #include "oops/instanceKlass.hpp" 53 #include "oops/method.hpp" 54 #include "oops/objArrayKlass.hpp" 55 #include "oops/objArrayOop.inline.hpp" 56 #include "oops/oop.inline.hpp" 57 #include "prims/jvm_misc.hpp" 58 #include "prims/jvmtiExport.hpp" 59 #include "prims/jvmtiThreadState.hpp" 60 #include "prims/nativeLookup.hpp" 61 #include "prims/stackwalk.hpp" 62 #include "runtime/arguments.hpp" 63 #include "runtime/atomic.hpp" 64 #include "runtime/handles.inline.hpp" 65 #include "runtime/init.hpp" 66 #include "runtime/interfaceSupport.inline.hpp" 67 #include "runtime/deoptimization.hpp" 68 #include "runtime/handshake.hpp" 69 #include "runtime/java.hpp" 70 #include "runtime/javaCalls.hpp" 71 #include "runtime/jfieldIDWorkaround.hpp" 72 #include "runtime/jniHandles.inline.hpp" 73 #include "runtime/orderAccess.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 98 /* 99 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 100 such ctors and calls MUST NOT come between an oop declaration/init and its 101 usage because if objects are move this may cause various memory stomps, bus 102 errors and segfaults. Here is a cookbook for causing so called "naked oop 103 failures": 104 105 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 106 JVMWrapper("JVM_GetClassDeclaredFields"); 107 108 // Object address to be held directly in mirror & not visible to GC 109 oop mirror = JNIHandles::resolve_non_null(ofClass); 110 111 // If this ctor can hit a safepoint, moving objects around, then 112 ComplexConstructor foo; 113 114 // Boom! mirror may point to JUNK instead of the intended object 115 (some dereference of mirror) 116 117 // Here's another call that may block for GC, making mirror stale 118 MutexLocker ml(some_lock); 119 120 // And here's an initializer that can result in a stale oop 121 // all in one step. 122 oop o = call_that_can_throw_exception(TRAPS); 123 124 125 The solution is to keep the oop declaration BELOW the ctor or function 126 call that might cause a GC, do another resolve to reassign the oop, or 127 consider use of a Handle instead of an oop so there is immunity from object 128 motion. But note that the "QUICK" entries below do not have a handlemark 129 and thus can only support use of handles passed in. 130 */ 131 132 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 133 ResourceMark rm; 134 int line_number = -1; 135 const char * source_file = NULL; 136 const char * trace = "explicit"; 137 InstanceKlass* caller = NULL; 138 JavaThread* jthread = JavaThread::current(); 139 if (jthread->has_last_Java_frame()) { 140 vframeStream vfst(jthread); 141 142 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 143 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController"); 144 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 145 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction"); 146 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 147 148 Method* last_caller = NULL; 149 150 while (!vfst.at_end()) { 151 Method* m = vfst.method(); 152 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 153 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 154 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 155 break; 156 } 157 last_caller = m; 158 vfst.next(); 159 } 160 // if this is called from Class.forName0 and that is called from Class.forName, 161 // then print the caller of Class.forName. If this is Class.loadClass, then print 162 // that caller, otherwise keep quiet since this should be picked up elsewhere. 163 bool found_it = false; 164 if (!vfst.at_end() && 165 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 166 vfst.method()->name() == vmSymbols::forName0_name()) { 167 vfst.next(); 168 if (!vfst.at_end() && 169 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 170 vfst.method()->name() == vmSymbols::forName_name()) { 171 vfst.next(); 172 found_it = true; 173 } 174 } else if (last_caller != NULL && 175 last_caller->method_holder()->name() == 176 vmSymbols::java_lang_ClassLoader() && 177 last_caller->name() == vmSymbols::loadClass_name()) { 178 found_it = true; 179 } else if (!vfst.at_end()) { 180 if (vfst.method()->is_native()) { 181 // JNI call 182 found_it = true; 183 } 184 } 185 if (found_it && !vfst.at_end()) { 186 // found the caller 187 caller = vfst.method()->method_holder(); 188 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 189 if (line_number == -1) { 190 // show method name if it's a native method 191 trace = vfst.method()->name_and_sig_as_C_string(); 192 } 193 Symbol* s = caller->source_file_name(); 194 if (s != NULL) { 195 source_file = s->as_C_string(); 196 } 197 } 198 } 199 if (caller != NULL) { 200 if (to_class != caller) { 201 const char * from = caller->external_name(); 202 const char * to = to_class->external_name(); 203 // print in a single call to reduce interleaving between threads 204 if (source_file != NULL) { 205 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 206 } else { 207 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 208 } 209 } 210 } 211 } 212 213 void trace_class_resolution(Klass* to_class) { 214 EXCEPTION_MARK; 215 trace_class_resolution_impl(to_class, THREAD); 216 if (HAS_PENDING_EXCEPTION) { 217 CLEAR_PENDING_EXCEPTION; 218 } 219 } 220 221 // Wrapper to trace JVM functions 222 223 #ifdef ASSERT 224 Histogram* JVMHistogram; 225 volatile int JVMHistogram_lock = 0; 226 227 class JVMHistogramElement : public HistogramElement { 228 public: 229 JVMHistogramElement(const char* name); 230 }; 231 232 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 233 _name = elementName; 234 uintx count = 0; 235 236 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 237 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 238 count +=1; 239 if ( (WarnOnStalledSpinLock > 0) 240 && (count % WarnOnStalledSpinLock == 0)) { 241 warning("JVMHistogram_lock seems to be stalled"); 242 } 243 } 244 } 245 246 if(JVMHistogram == NULL) 247 JVMHistogram = new Histogram("JVM Call Counts",100); 248 249 JVMHistogram->add_element(this); 250 Atomic::dec(&JVMHistogram_lock); 251 } 252 253 #define JVMCountWrapper(arg) \ 254 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 255 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 256 257 #define JVMWrapper(arg) JVMCountWrapper(arg); 258 #else 259 #define JVMWrapper(arg) 260 #endif 261 262 263 // Interface version ///////////////////////////////////////////////////////////////////// 264 265 266 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 267 return JVM_INTERFACE_VERSION; 268 JVM_END 269 270 271 // java.lang.System ////////////////////////////////////////////////////////////////////// 272 273 274 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 275 JVMWrapper("JVM_CurrentTimeMillis"); 276 return os::javaTimeMillis(); 277 JVM_END 278 279 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 280 JVMWrapper("JVM_NanoTime"); 281 return os::javaTimeNanos(); 282 JVM_END 283 284 // The function below is actually exposed by jdk.internal.misc.VM and not 285 // java.lang.System, but we choose to keep it here so that it stays next 286 // to JVM_CurrentTimeMillis and JVM_NanoTime 287 288 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 289 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 290 291 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 292 JVMWrapper("JVM_GetNanoTimeAdjustment"); 293 jlong seconds; 294 jlong nanos; 295 296 os::javaTimeSystemUTC(seconds, nanos); 297 298 // We're going to verify that the result can fit in a long. 299 // For that we need the difference in seconds between 'seconds' 300 // and 'offset_secs' to be such that: 301 // |seconds - offset_secs| < (2^63/10^9) 302 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 303 // which makes |seconds - offset_secs| < 2^33 304 // and we will prefer +/- 2^32 as the maximum acceptable diff 305 // as 2^32 has a more natural feel than 2^33... 306 // 307 // So if |seconds - offset_secs| >= 2^32 - we return a special 308 // sentinel value (-1) which the caller should take as an 309 // exception value indicating that the offset given to us is 310 // too far from range of the current time - leading to too big 311 // a nano adjustment. The caller is expected to recover by 312 // computing a more accurate offset and calling this method 313 // again. (For the record 2^32 secs is ~136 years, so that 314 // should rarely happen) 315 // 316 jlong diff = seconds - offset_secs; 317 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 318 return -1; // sentinel value: the offset is too far off the target 319 } 320 321 // return the adjustment. If you compute a time by adding 322 // this number of nanoseconds along with the number of seconds 323 // in the offset you should get the current UTC time. 324 return (diff * (jlong)1000000000) + nanos; 325 JVM_END 326 327 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 328 jobject dst, jint dst_pos, jint length)) 329 JVMWrapper("JVM_ArrayCopy"); 330 // Check if we have null pointers 331 if (src == NULL || dst == NULL) { 332 THROW(vmSymbols::java_lang_NullPointerException()); 333 } 334 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 335 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 336 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 337 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 338 // Do copy 339 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 340 JVM_END 341 342 343 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 344 JavaValue r(T_OBJECT); 345 // public synchronized Object put(Object key, Object value); 346 HandleMark hm(THREAD); 347 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 348 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 349 JavaCalls::call_virtual(&r, 350 props, 351 SystemDictionary::Properties_klass(), 352 vmSymbols::put_name(), 353 vmSymbols::object_object_object_signature(), 354 key_str, 355 value_str, 356 THREAD); 357 } 358 359 360 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 361 362 /* 363 * Return all of the system properties in a Java String array with alternating 364 * names and values from the jvm SystemProperty. 365 * Which includes some internal and all commandline -D defined properties. 366 */ 367 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 368 JVMWrapper("JVM_GetProperties"); 369 ResourceMark rm(THREAD); 370 HandleMark hm(THREAD); 371 int ndx = 0; 372 int fixedCount = 2; 373 374 SystemProperty* p = Arguments::system_properties(); 375 int count = Arguments::PropertyList_count(p); 376 377 // Allocate result String array 378 InstanceKlass* ik = SystemDictionary::String_klass(); 379 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 380 objArrayHandle result_h(THREAD, r); 381 382 while (p != NULL) { 383 const char * key = p->key(); 384 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 385 const char * value = p->value(); 386 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 387 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL); 388 result_h->obj_at_put(ndx * 2, key_str()); 389 result_h->obj_at_put(ndx * 2 + 1, value_str()); 390 ndx++; 391 } 392 p = p->next(); 393 } 394 395 // Convert the -XX:MaxDirectMemorySize= command line flag 396 // to the sun.nio.MaxDirectMemorySize property. 397 // Do this after setting user properties to prevent people 398 // from setting the value with a -D option, as requested. 399 // Leave empty if not supplied 400 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 401 char as_chars[256]; 402 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 403 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 404 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 405 result_h->obj_at_put(ndx * 2, key_str()); 406 result_h->obj_at_put(ndx * 2 + 1, value_str()); 407 ndx++; 408 } 409 410 // JVM monitoring and management support 411 // Add the sun.management.compiler property for the compiler's name 412 { 413 #undef CSIZE 414 #if defined(_LP64) || defined(_WIN64) 415 #define CSIZE "64-Bit " 416 #else 417 #define CSIZE 418 #endif // 64bit 419 420 #ifdef TIERED 421 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 422 #else 423 #if defined(COMPILER1) 424 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 425 #elif defined(COMPILER2) 426 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 427 #elif INCLUDE_JVMCI 428 #error "INCLUDE_JVMCI should imply TIERED" 429 #else 430 const char* compiler_name = ""; 431 #endif // compilers 432 #endif // TIERED 433 434 if (*compiler_name != '\0' && 435 (Arguments::mode() != Arguments::_int)) { 436 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 437 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 438 result_h->obj_at_put(ndx * 2, key_str()); 439 result_h->obj_at_put(ndx * 2 + 1, value_str()); 440 ndx++; 441 } 442 } 443 444 return (jobjectArray) JNIHandles::make_local(env, result_h()); 445 JVM_END 446 447 448 /* 449 * Return the temporary directory that the VM uses for the attach 450 * and perf data files. 451 * 452 * It is important that this directory is well-known and the 453 * same for all VM instances. It cannot be affected by configuration 454 * variables such as java.io.tmpdir. 455 */ 456 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 457 JVMWrapper("JVM_GetTemporaryDirectory"); 458 HandleMark hm(THREAD); 459 const char* temp_dir = os::get_temp_directory(); 460 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 461 return (jstring) JNIHandles::make_local(env, h()); 462 JVM_END 463 464 465 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 466 467 extern volatile jint vm_created; 468 469 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 470 JVMWrapper("JVM_BeforeHalt"); 471 EventShutdown event; 472 if (event.should_commit()) { 473 event.set_reason("Shutdown requested from Java"); 474 event.commit(); 475 } 476 JVM_END 477 478 479 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 480 before_exit(thread); 481 vm_exit(code); 482 JVM_END 483 484 485 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 486 JVMWrapper("JVM_GC"); 487 if (!DisableExplicitGC) { 488 Universe::heap()->collect(GCCause::_java_lang_system_gc); 489 } 490 JVM_END 491 492 493 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 494 JVMWrapper("JVM_MaxObjectInspectionAge"); 495 return Universe::heap()->millis_since_last_gc(); 496 JVM_END 497 498 499 static inline jlong convert_size_t_to_jlong(size_t val) { 500 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 501 NOT_LP64 (return (jlong)val;) 502 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 503 } 504 505 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 506 JVMWrapper("JVM_TotalMemory"); 507 size_t n = Universe::heap()->capacity(); 508 return convert_size_t_to_jlong(n); 509 JVM_END 510 511 512 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 513 JVMWrapper("JVM_FreeMemory"); 514 size_t n = Universe::heap()->unused(); 515 return convert_size_t_to_jlong(n); 516 JVM_END 517 518 519 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 520 JVMWrapper("JVM_MaxMemory"); 521 size_t n = Universe::heap()->max_capacity(); 522 return convert_size_t_to_jlong(n); 523 JVM_END 524 525 526 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 527 JVMWrapper("JVM_ActiveProcessorCount"); 528 return os::active_processor_count(); 529 JVM_END 530 531 532 533 // java.lang.Throwable ////////////////////////////////////////////////////// 534 535 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 536 JVMWrapper("JVM_FillInStackTrace"); 537 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 538 java_lang_Throwable::fill_in_stack_trace(exception); 539 JVM_END 540 541 // java.lang.NullPointerException /////////////////////////////////////////// 542 543 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 544 if (!ShowCodeDetailsInExceptionMessages) return NULL; 545 546 oop exc = JNIHandles::resolve_non_null(throwable); 547 548 Method* method; 549 int bci; 550 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 551 return NULL; 552 } 553 if (method->is_native()) { 554 return NULL; 555 } 556 557 stringStream ss; 558 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 559 if (ok) { 560 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_0); 561 return (jstring) JNIHandles::make_local(env, result); 562 } else { 563 return NULL; 564 } 565 JVM_END 566 567 // java.lang.StackTraceElement ////////////////////////////////////////////// 568 569 570 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 571 JVMWrapper("JVM_InitStackTraceElementArray"); 572 Handle exception(THREAD, JNIHandles::resolve(throwable)); 573 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 574 objArrayHandle stack_trace(THREAD, st); 575 // Fill in the allocated stack trace 576 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 577 JVM_END 578 579 580 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 581 JVMWrapper("JVM_InitStackTraceElement"); 582 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 583 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 584 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 585 JVM_END 586 587 588 // java.lang.StackWalker ////////////////////////////////////////////////////// 589 590 591 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 592 jint skip_frames, jint frame_count, jint start_index, 593 jobjectArray frames)) 594 JVMWrapper("JVM_CallStackWalk"); 595 JavaThread* jt = (JavaThread*) THREAD; 596 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 597 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 598 } 599 600 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 601 602 // frames array is a Class<?>[] array when only getting caller reference, 603 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 604 // be null. 605 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 606 objArrayHandle frames_array_h(THREAD, fa); 607 608 int limit = start_index + frame_count; 609 if (frames_array_h->length() < limit) { 610 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 611 } 612 613 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 614 start_index, frames_array_h, CHECK_NULL); 615 return JNIHandles::make_local(env, result); 616 JVM_END 617 618 619 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 620 jint frame_count, jint start_index, 621 jobjectArray frames)) 622 JVMWrapper("JVM_MoreStackWalk"); 623 JavaThread* jt = (JavaThread*) THREAD; 624 625 // frames array is a Class<?>[] array when only getting caller reference, 626 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 627 // be null. 628 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 629 objArrayHandle frames_array_h(THREAD, fa); 630 631 int limit = start_index+frame_count; 632 if (frames_array_h->length() < limit) { 633 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 634 } 635 636 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 637 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 638 start_index, frames_array_h, THREAD); 639 JVM_END 640 641 // java.lang.Object /////////////////////////////////////////////// 642 643 644 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 645 JVMWrapper("JVM_IHashCode"); 646 // as implemented in the classic virtual machine; return 0 if object is NULL 647 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 648 JVM_END 649 650 651 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 652 JVMWrapper("JVM_MonitorWait"); 653 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 654 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 655 if (JvmtiExport::should_post_monitor_wait()) { 656 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 657 658 // The current thread already owns the monitor and it has not yet 659 // been added to the wait queue so the current thread cannot be 660 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 661 // event handler cannot accidentally consume an unpark() meant for 662 // the ParkEvent associated with this ObjectMonitor. 663 } 664 ObjectSynchronizer::wait(obj, ms, CHECK); 665 JVM_END 666 667 668 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 669 JVMWrapper("JVM_MonitorNotify"); 670 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 671 ObjectSynchronizer::notify(obj, CHECK); 672 JVM_END 673 674 675 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 676 JVMWrapper("JVM_MonitorNotifyAll"); 677 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 678 ObjectSynchronizer::notifyall(obj, CHECK); 679 JVM_END 680 681 682 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 683 JVMWrapper("JVM_Clone"); 684 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 685 Klass* klass = obj->klass(); 686 JvmtiVMObjectAllocEventCollector oam; 687 688 #ifdef ASSERT 689 // Just checking that the cloneable flag is set correct 690 if (obj->is_array()) { 691 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 692 } else { 693 guarantee(obj->is_instance(), "should be instanceOop"); 694 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 695 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 696 } 697 #endif 698 699 // Check if class of obj supports the Cloneable interface. 700 // All arrays are considered to be cloneable (See JLS 20.1.5). 701 // All j.l.r.Reference classes are considered non-cloneable. 702 if (!klass->is_cloneable() || 703 (klass->is_instance_klass() && 704 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 705 ResourceMark rm(THREAD); 706 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 707 } 708 709 // Make shallow object copy 710 const int size = obj->size(); 711 oop new_obj_oop = NULL; 712 if (obj->is_array()) { 713 const int length = ((arrayOop)obj())->length(); 714 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 715 /* do_zero */ true, CHECK_NULL); 716 } else { 717 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 718 } 719 720 HeapAccess<>::clone(obj(), new_obj_oop, size); 721 722 Handle new_obj(THREAD, new_obj_oop); 723 // Caution: this involves a java upcall, so the clone should be 724 // "gc-robust" by this stage. 725 if (klass->has_finalizer()) { 726 assert(obj->is_instance(), "should be instanceOop"); 727 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 728 new_obj = Handle(THREAD, new_obj_oop); 729 } 730 731 return JNIHandles::make_local(env, new_obj()); 732 JVM_END 733 734 // java.io.File /////////////////////////////////////////////////////////////// 735 736 JVM_LEAF(char*, JVM_NativePath(char* path)) 737 JVMWrapper("JVM_NativePath"); 738 return os::native_path(path); 739 JVM_END 740 741 742 // Misc. class handling /////////////////////////////////////////////////////////// 743 744 745 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 746 JVMWrapper("JVM_GetCallerClass"); 747 748 // Getting the class of the caller frame. 749 // 750 // The call stack at this point looks something like this: 751 // 752 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 753 // [1] [ @CallerSensitive API.method ] 754 // [.] [ (skipped intermediate frames) ] 755 // [n] [ caller ] 756 vframeStream vfst(thread); 757 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 758 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 759 Method* m = vfst.method(); 760 assert(m != NULL, "sanity"); 761 switch (n) { 762 case 0: 763 // This must only be called from Reflection.getCallerClass 764 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 765 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 766 } 767 // fall-through 768 case 1: 769 // Frame 0 and 1 must be caller sensitive. 770 if (!m->caller_sensitive()) { 771 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 772 } 773 break; 774 default: 775 if (!m->is_ignored_by_security_stack_walk()) { 776 // We have reached the desired frame; return the holder class. 777 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 778 } 779 break; 780 } 781 } 782 return NULL; 783 JVM_END 784 785 786 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 787 JVMWrapper("JVM_FindPrimitiveClass"); 788 oop mirror = NULL; 789 BasicType t = name2type(utf); 790 if (t != T_ILLEGAL && !is_reference_type(t)) { 791 mirror = Universe::java_mirror(t); 792 } 793 if (mirror == NULL) { 794 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 795 } else { 796 return (jclass) JNIHandles::make_local(env, mirror); 797 } 798 JVM_END 799 800 801 // Returns a class loaded by the bootstrap class loader; or null 802 // if not found. ClassNotFoundException is not thrown. 803 // FindClassFromBootLoader is exported to the launcher for windows. 804 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 805 const char* name)) 806 JVMWrapper("JVM_FindClassFromBootLoader"); 807 808 // Java libraries should ensure that name is never null... 809 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 810 // It's impossible to create this class; the name cannot fit 811 // into the constant pool. 812 return NULL; 813 } 814 815 TempNewSymbol h_name = SymbolTable::new_symbol(name); 816 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 817 if (k == NULL) { 818 return NULL; 819 } 820 821 if (log_is_enabled(Debug, class, resolve)) { 822 trace_class_resolution(k); 823 } 824 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 825 JVM_END 826 827 // Find a class with this name in this loader, using the caller's protection domain. 828 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 829 jboolean init, jobject loader, 830 jclass caller)) 831 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 832 // Java libraries should ensure that name is never null... 833 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 834 // It's impossible to create this class; the name cannot fit 835 // into the constant pool. 836 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 837 } 838 839 TempNewSymbol h_name = SymbolTable::new_symbol(name); 840 841 oop loader_oop = JNIHandles::resolve(loader); 842 oop from_class = JNIHandles::resolve(caller); 843 oop protection_domain = NULL; 844 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 845 // NPE. Put it in another way, the bootstrap class loader has all permission and 846 // thus no checkPackageAccess equivalence in the VM class loader. 847 // The caller is also passed as NULL by the java code if there is no security 848 // manager to avoid the performance cost of getting the calling class. 849 if (from_class != NULL && loader_oop != NULL) { 850 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 851 } 852 853 Handle h_loader(THREAD, loader_oop); 854 Handle h_prot(THREAD, protection_domain); 855 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 856 h_prot, false, THREAD); 857 858 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 859 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 860 } 861 return result; 862 JVM_END 863 864 // Currently only called from the old verifier. 865 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 866 jboolean init, jclass from)) 867 JVMWrapper("JVM_FindClassFromClass"); 868 if (name == NULL) { 869 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 870 } 871 if ((int)strlen(name) > Symbol::max_length()) { 872 // It's impossible to create this class; the name cannot fit 873 // into the constant pool. 874 Exceptions::fthrow(THREAD_AND_LOCATION, 875 vmSymbols::java_lang_NoClassDefFoundError(), 876 "Class name exceeds maximum length of %d: %s", 877 Symbol::max_length(), 878 name); 879 return 0; 880 } 881 TempNewSymbol h_name = SymbolTable::new_symbol(name); 882 oop from_class_oop = JNIHandles::resolve(from); 883 Klass* from_class = (from_class_oop == NULL) 884 ? (Klass*)NULL 885 : java_lang_Class::as_Klass(from_class_oop); 886 oop class_loader = NULL; 887 oop protection_domain = NULL; 888 if (from_class != NULL) { 889 class_loader = from_class->class_loader(); 890 protection_domain = from_class->protection_domain(); 891 } 892 Handle h_loader(THREAD, class_loader); 893 Handle h_prot (THREAD, protection_domain); 894 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 895 h_prot, true, thread); 896 897 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 898 // this function is generally only used for class loading during verification. 899 ResourceMark rm; 900 oop from_mirror = JNIHandles::resolve_non_null(from); 901 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 902 const char * from_name = from_class->external_name(); 903 904 oop mirror = JNIHandles::resolve_non_null(result); 905 Klass* to_class = java_lang_Class::as_Klass(mirror); 906 const char * to = to_class->external_name(); 907 log_debug(class, resolve)("%s %s (verification)", from_name, to); 908 } 909 910 return result; 911 JVM_END 912 913 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 914 if (loader.is_null()) { 915 return; 916 } 917 918 // check whether the current caller thread holds the lock or not. 919 // If not, increment the corresponding counter 920 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 921 ObjectSynchronizer::owner_self) { 922 counter->inc(); 923 } 924 } 925 926 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 927 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 928 jobject loader, const jbyte *buf, 929 jsize len, jobject pd, const char *source, 930 TRAPS) { 931 if (source == NULL) source = "__JVM_DefineClass__"; 932 933 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 934 JavaThread* jt = (JavaThread*) THREAD; 935 936 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 937 ClassLoader::perf_define_appclass_selftime(), 938 ClassLoader::perf_define_appclasses(), 939 jt->get_thread_stat()->perf_recursion_counts_addr(), 940 jt->get_thread_stat()->perf_timers_addr(), 941 PerfClassTraceTime::DEFINE_CLASS); 942 943 if (UsePerfData) { 944 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 945 } 946 947 // Since exceptions can be thrown, class initialization can take place 948 // if name is NULL no check for class name in .class stream has to be made. 949 TempNewSymbol class_name = NULL; 950 if (name != NULL) { 951 const int str_len = (int)strlen(name); 952 if (str_len > Symbol::max_length()) { 953 // It's impossible to create this class; the name cannot fit 954 // into the constant pool. 955 Exceptions::fthrow(THREAD_AND_LOCATION, 956 vmSymbols::java_lang_NoClassDefFoundError(), 957 "Class name exceeds maximum length of %d: %s", 958 Symbol::max_length(), 959 name); 960 return 0; 961 } 962 class_name = SymbolTable::new_symbol(name, str_len); 963 } 964 965 ResourceMark rm(THREAD); 966 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 967 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 968 if (UsePerfData) { 969 is_lock_held_by_thread(class_loader, 970 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 971 THREAD); 972 } 973 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 974 Klass* k = SystemDictionary::resolve_from_stream(class_name, 975 class_loader, 976 protection_domain, 977 &st, 978 CHECK_NULL); 979 980 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 981 trace_class_resolution(k); 982 } 983 984 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 985 } 986 987 988 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 989 JVMWrapper("JVM_DefineClass"); 990 991 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 992 JVM_END 993 994 995 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 996 JVMWrapper("JVM_DefineClassWithSource"); 997 998 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 999 JVM_END 1000 1001 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1002 JVMWrapper("JVM_FindLoadedClass"); 1003 ResourceMark rm(THREAD); 1004 1005 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1006 char* str = java_lang_String::as_utf8_string(h_name()); 1007 1008 // Sanity check, don't expect null 1009 if (str == NULL) return NULL; 1010 1011 // Internalize the string, converting '.' to '/' in string. 1012 char* p = (char*)str; 1013 while (*p != '\0') { 1014 if (*p == '.') { 1015 *p = '/'; 1016 } 1017 p++; 1018 } 1019 1020 const int str_len = (int)(p - str); 1021 if (str_len > Symbol::max_length()) { 1022 // It's impossible to create this class; the name cannot fit 1023 // into the constant pool. 1024 return NULL; 1025 } 1026 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1027 1028 // Security Note: 1029 // The Java level wrapper will perform the necessary security check allowing 1030 // us to pass the NULL as the initiating class loader. 1031 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1032 if (UsePerfData) { 1033 is_lock_held_by_thread(h_loader, 1034 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1035 THREAD); 1036 } 1037 1038 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1039 h_loader, 1040 Handle(), 1041 CHECK_NULL); 1042 #if INCLUDE_CDS 1043 if (k == NULL) { 1044 // If the class is not already loaded, try to see if it's in the shared 1045 // archive for the current classloader (h_loader). 1046 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1047 } 1048 #endif 1049 return (k == NULL) ? NULL : 1050 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1051 JVM_END 1052 1053 // Module support ////////////////////////////////////////////////////////////////////////////// 1054 1055 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1056 jstring location, const char* const* packages, jsize num_packages)) 1057 JVMWrapper("JVM_DefineModule"); 1058 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1059 JVM_END 1060 1061 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1062 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1063 Modules::set_bootloader_unnamed_module(module, CHECK); 1064 JVM_END 1065 1066 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1067 JVMWrapper("JVM_AddModuleExports"); 1068 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1069 JVM_END 1070 1071 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1072 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1073 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1074 JVM_END 1075 1076 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1077 JVMWrapper("JVM_AddModuleExportsToAll"); 1078 Modules::add_module_exports(from_module, package, NULL, CHECK); 1079 JVM_END 1080 1081 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1082 JVMWrapper("JVM_AddReadsModule"); 1083 Modules::add_reads_module(from_module, source_module, CHECK); 1084 JVM_END 1085 1086 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1087 1088 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1089 assert (cls != NULL, "illegal class"); 1090 JVMWrapper("JVM_InitClassName"); 1091 JvmtiVMObjectAllocEventCollector oam; 1092 ResourceMark rm(THREAD); 1093 HandleMark hm(THREAD); 1094 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1095 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1096 return (jstring) JNIHandles::make_local(env, result); 1097 JVM_END 1098 1099 1100 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1101 JVMWrapper("JVM_GetClassInterfaces"); 1102 JvmtiVMObjectAllocEventCollector oam; 1103 oop mirror = JNIHandles::resolve_non_null(cls); 1104 1105 // Special handling for primitive objects 1106 if (java_lang_Class::is_primitive(mirror)) { 1107 // Primitive objects does not have any interfaces 1108 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1109 return (jobjectArray) JNIHandles::make_local(env, r); 1110 } 1111 1112 Klass* klass = java_lang_Class::as_Klass(mirror); 1113 // Figure size of result array 1114 int size; 1115 if (klass->is_instance_klass()) { 1116 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1117 } else { 1118 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1119 size = 2; 1120 } 1121 1122 // Allocate result array 1123 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1124 objArrayHandle result (THREAD, r); 1125 // Fill in result 1126 if (klass->is_instance_klass()) { 1127 // Regular instance klass, fill in all local interfaces 1128 for (int index = 0; index < size; index++) { 1129 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1130 result->obj_at_put(index, k->java_mirror()); 1131 } 1132 } else { 1133 // All arrays implement java.lang.Cloneable and java.io.Serializable 1134 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1135 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1136 } 1137 return (jobjectArray) JNIHandles::make_local(env, result()); 1138 JVM_END 1139 1140 1141 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1142 JVMWrapper("JVM_IsInterface"); 1143 oop mirror = JNIHandles::resolve_non_null(cls); 1144 if (java_lang_Class::is_primitive(mirror)) { 1145 return JNI_FALSE; 1146 } 1147 Klass* k = java_lang_Class::as_Klass(mirror); 1148 jboolean result = k->is_interface(); 1149 assert(!result || k->is_instance_klass(), 1150 "all interfaces are instance types"); 1151 // The compiler intrinsic for isInterface tests the 1152 // Klass::_access_flags bits in the same way. 1153 return result; 1154 JVM_END 1155 1156 1157 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1158 JVMWrapper("JVM_GetClassSigners"); 1159 JvmtiVMObjectAllocEventCollector oam; 1160 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1161 // There are no signers for primitive types 1162 return NULL; 1163 } 1164 1165 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls))); 1166 1167 // If there are no signers set in the class, or if the class 1168 // is an array, return NULL. 1169 if (signers == NULL) return NULL; 1170 1171 // copy of the signers array 1172 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1173 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1174 for (int index = 0; index < signers->length(); index++) { 1175 signers_copy->obj_at_put(index, signers->obj_at(index)); 1176 } 1177 1178 // return the copy 1179 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1180 JVM_END 1181 1182 1183 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1184 JVMWrapper("JVM_SetClassSigners"); 1185 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1186 // This call is ignored for primitive types and arrays. 1187 // Signers are only set once, ClassLoader.java, and thus shouldn't 1188 // be called with an array. Only the bootstrap loader creates arrays. 1189 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1190 if (k->is_instance_klass()) { 1191 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1192 } 1193 } 1194 JVM_END 1195 1196 1197 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1198 JVMWrapper("JVM_GetProtectionDomain"); 1199 if (JNIHandles::resolve(cls) == NULL) { 1200 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1201 } 1202 1203 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1204 // Primitive types does not have a protection domain. 1205 return NULL; 1206 } 1207 1208 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1209 return (jobject) JNIHandles::make_local(env, pd); 1210 JVM_END 1211 1212 1213 // Returns the inherited_access_control_context field of the running thread. 1214 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1215 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1216 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1217 return JNIHandles::make_local(env, result); 1218 JVM_END 1219 1220 class RegisterArrayForGC { 1221 private: 1222 JavaThread *_thread; 1223 public: 1224 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1225 _thread = thread; 1226 _thread->register_array_for_gc(array); 1227 } 1228 1229 ~RegisterArrayForGC() { 1230 _thread->register_array_for_gc(NULL); 1231 } 1232 }; 1233 1234 1235 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1236 JVMWrapper("JVM_GetStackAccessControlContext"); 1237 if (!UsePrivilegedStack) return NULL; 1238 1239 ResourceMark rm(THREAD); 1240 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1241 JvmtiVMObjectAllocEventCollector oam; 1242 1243 // count the protection domains on the execution stack. We collapse 1244 // duplicate consecutive protection domains into a single one, as 1245 // well as stopping when we hit a privileged frame. 1246 1247 oop previous_protection_domain = NULL; 1248 Handle privileged_context(thread, NULL); 1249 bool is_privileged = false; 1250 oop protection_domain = NULL; 1251 1252 // Iterate through Java frames 1253 vframeStream vfst(thread); 1254 for(; !vfst.at_end(); vfst.next()) { 1255 // get method of frame 1256 Method* method = vfst.method(); 1257 1258 // stop at the first privileged frame 1259 if (method->method_holder() == SystemDictionary::AccessController_klass() && 1260 method->name() == vmSymbols::executePrivileged_name()) 1261 { 1262 // this frame is privileged 1263 is_privileged = true; 1264 1265 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1266 1267 StackValueCollection* locals = priv->locals(); 1268 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1269 StackValue* clr_sv = locals->at(2); // Class<?> caller 1270 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1271 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1272 privileged_context = ctx_sv->get_obj(); 1273 Handle caller = clr_sv->get_obj(); 1274 1275 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1276 protection_domain = caller_klass->protection_domain(); 1277 } else { 1278 protection_domain = method->method_holder()->protection_domain(); 1279 } 1280 1281 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1282 local_array->push(protection_domain); 1283 previous_protection_domain = protection_domain; 1284 } 1285 1286 if (is_privileged) break; 1287 } 1288 1289 1290 // either all the domains on the stack were system domains, or 1291 // we had a privileged system domain 1292 if (local_array->is_empty()) { 1293 if (is_privileged && privileged_context.is_null()) return NULL; 1294 1295 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1296 return JNIHandles::make_local(env, result); 1297 } 1298 1299 // the resource area must be registered in case of a gc 1300 RegisterArrayForGC ragc(thread, local_array); 1301 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1302 local_array->length(), CHECK_NULL); 1303 objArrayHandle h_context(thread, context); 1304 for (int index = 0; index < local_array->length(); index++) { 1305 h_context->obj_at_put(index, local_array->at(index)); 1306 } 1307 1308 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1309 1310 return JNIHandles::make_local(env, result); 1311 JVM_END 1312 1313 1314 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1315 JVMWrapper("JVM_IsArrayClass"); 1316 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1317 return (k != NULL) && k->is_array_klass() ? true : false; 1318 JVM_END 1319 1320 1321 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1322 JVMWrapper("JVM_IsPrimitiveClass"); 1323 oop mirror = JNIHandles::resolve_non_null(cls); 1324 return (jboolean) java_lang_Class::is_primitive(mirror); 1325 JVM_END 1326 1327 1328 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1329 JVMWrapper("JVM_GetClassModifiers"); 1330 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1331 // Primitive type 1332 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1333 } 1334 1335 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1336 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1337 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1338 return k->modifier_flags(); 1339 JVM_END 1340 1341 1342 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1343 1344 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1345 JvmtiVMObjectAllocEventCollector oam; 1346 // ofClass is a reference to a java_lang_Class object. The mirror object 1347 // of an InstanceKlass 1348 1349 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1350 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1351 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1352 return (jobjectArray)JNIHandles::make_local(env, result); 1353 } 1354 1355 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1356 InnerClassesIterator iter(k); 1357 1358 if (iter.length() == 0) { 1359 // Neither an inner nor outer class 1360 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1361 return (jobjectArray)JNIHandles::make_local(env, result); 1362 } 1363 1364 // find inner class info 1365 constantPoolHandle cp(thread, k->constants()); 1366 int length = iter.length(); 1367 1368 // Allocate temp. result array 1369 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1370 objArrayHandle result (THREAD, r); 1371 int members = 0; 1372 1373 for (; !iter.done(); iter.next()) { 1374 int ioff = iter.inner_class_info_index(); 1375 int ooff = iter.outer_class_info_index(); 1376 1377 if (ioff != 0 && ooff != 0) { 1378 // Check to see if the name matches the class we're looking for 1379 // before attempting to find the class. 1380 if (cp->klass_name_at_matches(k, ooff)) { 1381 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1382 if (outer_klass == k) { 1383 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1384 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1385 1386 // Throws an exception if outer klass has not declared k as 1387 // an inner klass 1388 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1389 1390 result->obj_at_put(members, inner_klass->java_mirror()); 1391 members++; 1392 } 1393 } 1394 } 1395 } 1396 1397 if (members != length) { 1398 // Return array of right length 1399 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1400 for(int i = 0; i < members; i++) { 1401 res->obj_at_put(i, result->obj_at(i)); 1402 } 1403 return (jobjectArray)JNIHandles::make_local(env, res); 1404 } 1405 1406 return (jobjectArray)JNIHandles::make_local(env, result()); 1407 JVM_END 1408 1409 1410 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1411 { 1412 // ofClass is a reference to a java_lang_Class object. 1413 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1414 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1415 return NULL; 1416 } 1417 1418 bool inner_is_member = false; 1419 Klass* outer_klass 1420 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1421 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1422 if (outer_klass == NULL) return NULL; // already a top-level class 1423 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1424 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1425 } 1426 JVM_END 1427 1428 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1429 { 1430 oop mirror = JNIHandles::resolve_non_null(cls); 1431 if (java_lang_Class::is_primitive(mirror) || 1432 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1433 return NULL; 1434 } 1435 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1436 int ooff = 0, noff = 0; 1437 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1438 if (noff != 0) { 1439 constantPoolHandle i_cp(thread, k->constants()); 1440 Symbol* name = i_cp->symbol_at(noff); 1441 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1442 return (jstring) JNIHandles::make_local(env, str()); 1443 } 1444 } 1445 return NULL; 1446 } 1447 JVM_END 1448 1449 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1450 assert (cls != NULL, "illegal class"); 1451 JVMWrapper("JVM_GetClassSignature"); 1452 JvmtiVMObjectAllocEventCollector oam; 1453 ResourceMark rm(THREAD); 1454 // Return null for arrays and primatives 1455 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1456 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1457 if (k->is_instance_klass()) { 1458 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1459 if (sym == NULL) return NULL; 1460 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1461 return (jstring) JNIHandles::make_local(env, str()); 1462 } 1463 } 1464 return NULL; 1465 JVM_END 1466 1467 1468 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1469 assert (cls != NULL, "illegal class"); 1470 JVMWrapper("JVM_GetClassAnnotations"); 1471 1472 // Return null for arrays and primitives 1473 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1474 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1475 if (k->is_instance_klass()) { 1476 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1477 return (jbyteArray) JNIHandles::make_local(env, a); 1478 } 1479 } 1480 return NULL; 1481 JVM_END 1482 1483 1484 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1485 // some of this code was adapted from from jni_FromReflectedField 1486 1487 oop reflected = JNIHandles::resolve_non_null(field); 1488 oop mirror = java_lang_reflect_Field::clazz(reflected); 1489 Klass* k = java_lang_Class::as_Klass(mirror); 1490 int slot = java_lang_reflect_Field::slot(reflected); 1491 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1492 1493 InstanceKlass* ik = InstanceKlass::cast(k); 1494 intptr_t offset = ik->field_offset(slot); 1495 1496 if (modifiers & JVM_ACC_STATIC) { 1497 // for static fields we only look in the current class 1498 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1499 assert(false, "cannot find static field"); 1500 return false; 1501 } 1502 } else { 1503 // for instance fields we start with the current class and work 1504 // our way up through the superclass chain 1505 if (!ik->find_field_from_offset(offset, false, &fd)) { 1506 assert(false, "cannot find instance field"); 1507 return false; 1508 } 1509 } 1510 return true; 1511 } 1512 1513 static Method* jvm_get_method_common(jobject method) { 1514 // some of this code was adapted from from jni_FromReflectedMethod 1515 1516 oop reflected = JNIHandles::resolve_non_null(method); 1517 oop mirror = NULL; 1518 int slot = 0; 1519 1520 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1521 mirror = java_lang_reflect_Constructor::clazz(reflected); 1522 slot = java_lang_reflect_Constructor::slot(reflected); 1523 } else { 1524 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1525 "wrong type"); 1526 mirror = java_lang_reflect_Method::clazz(reflected); 1527 slot = java_lang_reflect_Method::slot(reflected); 1528 } 1529 Klass* k = java_lang_Class::as_Klass(mirror); 1530 1531 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1532 assert(m != NULL, "cannot find method"); 1533 return m; // caller has to deal with NULL in product mode 1534 } 1535 1536 /* Type use annotations support (JDK 1.8) */ 1537 1538 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1539 assert (cls != NULL, "illegal class"); 1540 JVMWrapper("JVM_GetClassTypeAnnotations"); 1541 ResourceMark rm(THREAD); 1542 // Return null for arrays and primitives 1543 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1544 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1545 if (k->is_instance_klass()) { 1546 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1547 if (type_annotations != NULL) { 1548 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1549 return (jbyteArray) JNIHandles::make_local(env, a); 1550 } 1551 } 1552 } 1553 return NULL; 1554 JVM_END 1555 1556 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1557 assert (method != NULL, "illegal method"); 1558 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1559 1560 // method is a handle to a java.lang.reflect.Method object 1561 Method* m = jvm_get_method_common(method); 1562 if (m == NULL) { 1563 return NULL; 1564 } 1565 1566 AnnotationArray* type_annotations = m->type_annotations(); 1567 if (type_annotations != NULL) { 1568 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1569 return (jbyteArray) JNIHandles::make_local(env, a); 1570 } 1571 1572 return NULL; 1573 JVM_END 1574 1575 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1576 assert (field != NULL, "illegal field"); 1577 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1578 1579 fieldDescriptor fd; 1580 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1581 if (!gotFd) { 1582 return NULL; 1583 } 1584 1585 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1586 JVM_END 1587 1588 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1589 if (!cp->is_within_bounds(index)) { 1590 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1591 } 1592 } 1593 1594 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1595 { 1596 JVMWrapper("JVM_GetMethodParameters"); 1597 // method is a handle to a java.lang.reflect.Method object 1598 Method* method_ptr = jvm_get_method_common(method); 1599 methodHandle mh (THREAD, method_ptr); 1600 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1601 const int num_params = mh->method_parameters_length(); 1602 1603 if (num_params < 0) { 1604 // A -1 return value from method_parameters_length means there is no 1605 // parameter data. Return null to indicate this to the reflection 1606 // API. 1607 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1608 return (jobjectArray)NULL; 1609 } else { 1610 // Otherwise, we return something up to reflection, even if it is 1611 // a zero-length array. Why? Because in some cases this can 1612 // trigger a MalformedParametersException. 1613 1614 // make sure all the symbols are properly formatted 1615 for (int i = 0; i < num_params; i++) { 1616 MethodParametersElement* params = mh->method_parameters_start(); 1617 int index = params[i].name_cp_index; 1618 bounds_check(mh->constants(), index, CHECK_NULL); 1619 1620 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1621 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1622 "Wrong type at constant pool index"); 1623 } 1624 1625 } 1626 1627 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1628 objArrayHandle result (THREAD, result_oop); 1629 1630 for (int i = 0; i < num_params; i++) { 1631 MethodParametersElement* params = mh->method_parameters_start(); 1632 // For a 0 index, give a NULL symbol 1633 Symbol* sym = 0 != params[i].name_cp_index ? 1634 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1635 int flags = params[i].flags; 1636 oop param = Reflection::new_parameter(reflected_method, i, sym, 1637 flags, CHECK_NULL); 1638 result->obj_at_put(i, param); 1639 } 1640 return (jobjectArray)JNIHandles::make_local(env, result()); 1641 } 1642 } 1643 JVM_END 1644 1645 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1646 1647 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1648 { 1649 JVMWrapper("JVM_GetClassDeclaredFields"); 1650 JvmtiVMObjectAllocEventCollector oam; 1651 1652 // Exclude primitive types and array types 1653 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1654 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1655 // Return empty array 1656 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1657 return (jobjectArray) JNIHandles::make_local(env, res); 1658 } 1659 1660 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1661 constantPoolHandle cp(THREAD, k->constants()); 1662 1663 // Ensure class is linked 1664 k->link_class(CHECK_NULL); 1665 1666 // Allocate result 1667 int num_fields; 1668 1669 if (publicOnly) { 1670 num_fields = 0; 1671 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1672 if (fs.access_flags().is_public()) ++num_fields; 1673 } 1674 } else { 1675 num_fields = k->java_fields_count(); 1676 } 1677 1678 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1679 objArrayHandle result (THREAD, r); 1680 1681 int out_idx = 0; 1682 fieldDescriptor fd; 1683 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1684 if (!publicOnly || fs.access_flags().is_public()) { 1685 fd.reinitialize(k, fs.index()); 1686 oop field = Reflection::new_field(&fd, CHECK_NULL); 1687 result->obj_at_put(out_idx, field); 1688 ++out_idx; 1689 } 1690 } 1691 assert(out_idx == num_fields, "just checking"); 1692 return (jobjectArray) JNIHandles::make_local(env, result()); 1693 } 1694 JVM_END 1695 1696 static bool select_method(const methodHandle& method, bool want_constructor) { 1697 if (want_constructor) { 1698 return (method->is_initializer() && !method->is_static()); 1699 } else { 1700 return (!method->is_initializer() && !method->is_overpass()); 1701 } 1702 } 1703 1704 static jobjectArray get_class_declared_methods_helper( 1705 JNIEnv *env, 1706 jclass ofClass, jboolean publicOnly, 1707 bool want_constructor, 1708 Klass* klass, TRAPS) { 1709 1710 JvmtiVMObjectAllocEventCollector oam; 1711 1712 // Exclude primitive types and array types 1713 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1714 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1715 // Return empty array 1716 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1717 return (jobjectArray) JNIHandles::make_local(env, res); 1718 } 1719 1720 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1721 1722 // Ensure class is linked 1723 k->link_class(CHECK_NULL); 1724 1725 Array<Method*>* methods = k->methods(); 1726 int methods_length = methods->length(); 1727 1728 // Save original method_idnum in case of redefinition, which can change 1729 // the idnum of obsolete methods. The new method will have the same idnum 1730 // but if we refresh the methods array, the counts will be wrong. 1731 ResourceMark rm(THREAD); 1732 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1733 int num_methods = 0; 1734 1735 for (int i = 0; i < methods_length; i++) { 1736 methodHandle method(THREAD, methods->at(i)); 1737 if (select_method(method, want_constructor)) { 1738 if (!publicOnly || method->is_public()) { 1739 idnums->push(method->method_idnum()); 1740 ++num_methods; 1741 } 1742 } 1743 } 1744 1745 // Allocate result 1746 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1747 objArrayHandle result (THREAD, r); 1748 1749 // Now just put the methods that we selected above, but go by their idnum 1750 // in case of redefinition. The methods can be redefined at any safepoint, 1751 // so above when allocating the oop array and below when creating reflect 1752 // objects. 1753 for (int i = 0; i < num_methods; i++) { 1754 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1755 if (method.is_null()) { 1756 // Method may have been deleted and seems this API can handle null 1757 // Otherwise should probably put a method that throws NSME 1758 result->obj_at_put(i, NULL); 1759 } else { 1760 oop m; 1761 if (want_constructor) { 1762 m = Reflection::new_constructor(method, CHECK_NULL); 1763 } else { 1764 m = Reflection::new_method(method, false, CHECK_NULL); 1765 } 1766 result->obj_at_put(i, m); 1767 } 1768 } 1769 1770 return (jobjectArray) JNIHandles::make_local(env, result()); 1771 } 1772 1773 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1774 { 1775 JVMWrapper("JVM_GetClassDeclaredMethods"); 1776 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1777 /*want_constructor*/ false, 1778 SystemDictionary::reflect_Method_klass(), THREAD); 1779 } 1780 JVM_END 1781 1782 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1783 { 1784 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1785 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1786 /*want_constructor*/ true, 1787 SystemDictionary::reflect_Constructor_klass(), THREAD); 1788 } 1789 JVM_END 1790 1791 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1792 { 1793 JVMWrapper("JVM_GetClassAccessFlags"); 1794 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1795 // Primitive type 1796 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1797 } 1798 1799 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1800 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1801 } 1802 JVM_END 1803 1804 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1805 { 1806 JVMWrapper("JVM_AreNestMates"); 1807 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1808 assert(c->is_instance_klass(), "must be"); 1809 InstanceKlass* ck = InstanceKlass::cast(c); 1810 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 1811 assert(m->is_instance_klass(), "must be"); 1812 InstanceKlass* mk = InstanceKlass::cast(m); 1813 return ck->has_nestmate_access_to(mk, THREAD); 1814 } 1815 JVM_END 1816 1817 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1818 { 1819 // current is not a primitive or array class 1820 JVMWrapper("JVM_GetNestHost"); 1821 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1822 assert(c->is_instance_klass(), "must be"); 1823 InstanceKlass* ck = InstanceKlass::cast(c); 1824 // Don't post exceptions if validation fails 1825 InstanceKlass* host = ck->nest_host(NULL, THREAD); 1826 return (jclass) (host == NULL ? NULL : 1827 JNIHandles::make_local(THREAD, host->java_mirror())); 1828 } 1829 JVM_END 1830 1831 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1832 { 1833 // current is not a primitive or array class 1834 JVMWrapper("JVM_GetNestMembers"); 1835 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1836 assert(c->is_instance_klass(), "must be"); 1837 InstanceKlass* ck = InstanceKlass::cast(c); 1838 // Get the nest host for this nest - throw ICCE if validation fails 1839 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError(); 1840 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL); 1841 1842 { 1843 JvmtiVMObjectAllocEventCollector oam; 1844 Array<u2>* members = host->nest_members(); 1845 int length = members == NULL ? 0 : members->length(); 1846 // nest host is first in the array so make it one bigger 1847 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 1848 length + 1, CHECK_NULL); 1849 objArrayHandle result (THREAD, r); 1850 result->obj_at_put(0, host->java_mirror()); 1851 if (length != 0) { 1852 int i; 1853 for (i = 0; i < length; i++) { 1854 int cp_index = members->at(i); 1855 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL); 1856 if (k->is_instance_klass()) { 1857 InstanceKlass* nest_host_k = 1858 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL); 1859 if (nest_host_k == host) { 1860 result->obj_at_put(i+1, k->java_mirror()); 1861 } 1862 else { 1863 // k's nest host is legal but it isn't our host so 1864 // throw ICCE 1865 ResourceMark rm(THREAD); 1866 Exceptions::fthrow(THREAD_AND_LOCATION, 1867 icce, 1868 "Nest member %s in %s declares a different nest host of %s", 1869 k->external_name(), 1870 host->external_name(), 1871 nest_host_k->external_name() 1872 ); 1873 return NULL; 1874 } 1875 } 1876 else { 1877 // we have a bad nest member entry - throw ICCE 1878 ResourceMark rm(THREAD); 1879 Exceptions::fthrow(THREAD_AND_LOCATION, 1880 icce, 1881 "Class %s can not be a nest member of %s", 1882 k->external_name(), 1883 host->external_name() 1884 ); 1885 return NULL; 1886 } 1887 } 1888 } 1889 else { 1890 assert(host == ck, "must be singleton nest"); 1891 } 1892 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1893 } 1894 } 1895 JVM_END 1896 1897 // Constant pool access ////////////////////////////////////////////////////////// 1898 1899 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1900 { 1901 JVMWrapper("JVM_GetClassConstantPool"); 1902 JvmtiVMObjectAllocEventCollector oam; 1903 1904 // Return null for primitives and arrays 1905 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1906 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1907 if (k->is_instance_klass()) { 1908 InstanceKlass* k_h = InstanceKlass::cast(k); 1909 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1910 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1911 return JNIHandles::make_local(jcp()); 1912 } 1913 } 1914 return NULL; 1915 } 1916 JVM_END 1917 1918 1919 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1920 { 1921 JVMWrapper("JVM_ConstantPoolGetSize"); 1922 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1923 return cp->length(); 1924 } 1925 JVM_END 1926 1927 1928 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1929 { 1930 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1931 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1932 bounds_check(cp, index, CHECK_NULL); 1933 constantTag tag = cp->tag_at(index); 1934 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1935 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1936 } 1937 Klass* k = cp->klass_at(index, CHECK_NULL); 1938 return (jclass) JNIHandles::make_local(k->java_mirror()); 1939 } 1940 JVM_END 1941 1942 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1943 { 1944 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1945 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1946 bounds_check(cp, index, CHECK_NULL); 1947 constantTag tag = cp->tag_at(index); 1948 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1949 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1950 } 1951 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1952 if (k == NULL) return NULL; 1953 return (jclass) JNIHandles::make_local(k->java_mirror()); 1954 } 1955 JVM_END 1956 1957 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 1958 constantTag tag = cp->tag_at(index); 1959 if (!tag.is_method() && !tag.is_interface_method()) { 1960 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1961 } 1962 int klass_ref = cp->uncached_klass_ref_index_at(index); 1963 Klass* k_o; 1964 if (force_resolution) { 1965 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1966 } else { 1967 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1968 if (k_o == NULL) return NULL; 1969 } 1970 InstanceKlass* k = InstanceKlass::cast(k_o); 1971 Symbol* name = cp->uncached_name_ref_at(index); 1972 Symbol* sig = cp->uncached_signature_ref_at(index); 1973 methodHandle m (THREAD, k->find_method(name, sig)); 1974 if (m.is_null()) { 1975 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1976 } 1977 oop method; 1978 if (!m->is_initializer() || m->is_static()) { 1979 method = Reflection::new_method(m, true, CHECK_NULL); 1980 } else { 1981 method = Reflection::new_constructor(m, CHECK_NULL); 1982 } 1983 return JNIHandles::make_local(method); 1984 } 1985 1986 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1987 { 1988 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1989 JvmtiVMObjectAllocEventCollector oam; 1990 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1991 bounds_check(cp, index, CHECK_NULL); 1992 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1993 return res; 1994 } 1995 JVM_END 1996 1997 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1998 { 1999 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2000 JvmtiVMObjectAllocEventCollector oam; 2001 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2002 bounds_check(cp, index, CHECK_NULL); 2003 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2004 return res; 2005 } 2006 JVM_END 2007 2008 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2009 constantTag tag = cp->tag_at(index); 2010 if (!tag.is_field()) { 2011 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2012 } 2013 int klass_ref = cp->uncached_klass_ref_index_at(index); 2014 Klass* k_o; 2015 if (force_resolution) { 2016 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2017 } else { 2018 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2019 if (k_o == NULL) return NULL; 2020 } 2021 InstanceKlass* k = InstanceKlass::cast(k_o); 2022 Symbol* name = cp->uncached_name_ref_at(index); 2023 Symbol* sig = cp->uncached_signature_ref_at(index); 2024 fieldDescriptor fd; 2025 Klass* target_klass = k->find_field(name, sig, &fd); 2026 if (target_klass == NULL) { 2027 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2028 } 2029 oop field = Reflection::new_field(&fd, CHECK_NULL); 2030 return JNIHandles::make_local(field); 2031 } 2032 2033 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2034 { 2035 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2036 JvmtiVMObjectAllocEventCollector oam; 2037 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2038 bounds_check(cp, index, CHECK_NULL); 2039 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2040 return res; 2041 } 2042 JVM_END 2043 2044 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2045 { 2046 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2047 JvmtiVMObjectAllocEventCollector oam; 2048 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2049 bounds_check(cp, index, CHECK_NULL); 2050 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2051 return res; 2052 } 2053 JVM_END 2054 2055 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2056 { 2057 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2058 JvmtiVMObjectAllocEventCollector oam; 2059 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2060 bounds_check(cp, index, CHECK_NULL); 2061 constantTag tag = cp->tag_at(index); 2062 if (!tag.is_field_or_method()) { 2063 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2064 } 2065 int klass_ref = cp->uncached_klass_ref_index_at(index); 2066 Symbol* klass_name = cp->klass_name_at(klass_ref); 2067 Symbol* member_name = cp->uncached_name_ref_at(index); 2068 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2069 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2070 objArrayHandle dest(THREAD, dest_o); 2071 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2072 dest->obj_at_put(0, str()); 2073 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2074 dest->obj_at_put(1, str()); 2075 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2076 dest->obj_at_put(2, str()); 2077 return (jobjectArray) JNIHandles::make_local(dest()); 2078 } 2079 JVM_END 2080 2081 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2082 { 2083 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2084 JvmtiVMObjectAllocEventCollector oam; 2085 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2086 bounds_check(cp, index, CHECK_0); 2087 constantTag tag = cp->tag_at(index); 2088 if (!tag.is_field_or_method()) { 2089 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2090 } 2091 return (jint) cp->uncached_klass_ref_index_at(index); 2092 } 2093 JVM_END 2094 2095 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2096 { 2097 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2098 JvmtiVMObjectAllocEventCollector oam; 2099 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2100 bounds_check(cp, index, CHECK_0); 2101 constantTag tag = cp->tag_at(index); 2102 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2103 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2104 } 2105 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2106 } 2107 JVM_END 2108 2109 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2110 { 2111 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2112 JvmtiVMObjectAllocEventCollector oam; 2113 constantPoolHandle cp(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_name_and_type()) { 2117 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2118 } 2119 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2120 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2121 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2122 objArrayHandle dest(THREAD, dest_o); 2123 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2124 dest->obj_at_put(0, str()); 2125 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2126 dest->obj_at_put(1, str()); 2127 return (jobjectArray) JNIHandles::make_local(dest()); 2128 } 2129 JVM_END 2130 2131 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2132 { 2133 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2134 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2135 bounds_check(cp, index, CHECK_0); 2136 constantTag tag = cp->tag_at(index); 2137 if (!tag.is_int()) { 2138 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2139 } 2140 return cp->int_at(index); 2141 } 2142 JVM_END 2143 2144 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2145 { 2146 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2147 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2148 bounds_check(cp, index, CHECK_(0L)); 2149 constantTag tag = cp->tag_at(index); 2150 if (!tag.is_long()) { 2151 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2152 } 2153 return cp->long_at(index); 2154 } 2155 JVM_END 2156 2157 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2158 { 2159 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2160 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2161 bounds_check(cp, index, CHECK_(0.0f)); 2162 constantTag tag = cp->tag_at(index); 2163 if (!tag.is_float()) { 2164 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2165 } 2166 return cp->float_at(index); 2167 } 2168 JVM_END 2169 2170 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2171 { 2172 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2173 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2174 bounds_check(cp, index, CHECK_(0.0)); 2175 constantTag tag = cp->tag_at(index); 2176 if (!tag.is_double()) { 2177 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2178 } 2179 return cp->double_at(index); 2180 } 2181 JVM_END 2182 2183 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2184 { 2185 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2186 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2187 bounds_check(cp, index, CHECK_NULL); 2188 constantTag tag = cp->tag_at(index); 2189 if (!tag.is_string()) { 2190 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2191 } 2192 oop str = cp->string_at(index, CHECK_NULL); 2193 return (jstring) JNIHandles::make_local(str); 2194 } 2195 JVM_END 2196 2197 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2198 { 2199 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2200 JvmtiVMObjectAllocEventCollector oam; 2201 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2202 bounds_check(cp, index, CHECK_NULL); 2203 constantTag tag = cp->tag_at(index); 2204 if (!tag.is_symbol()) { 2205 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2206 } 2207 Symbol* sym = cp->symbol_at(index); 2208 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2209 return (jstring) JNIHandles::make_local(str()); 2210 } 2211 JVM_END 2212 2213 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2214 { 2215 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2216 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2217 bounds_check(cp, index, CHECK_0); 2218 constantTag tag = cp->tag_at(index); 2219 jbyte result = tag.value(); 2220 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2221 // they are changed to the corresponding tags from the JVM spec, so that java code in 2222 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2223 if (tag.is_klass_or_reference()) { 2224 result = JVM_CONSTANT_Class; 2225 } else if (tag.is_string_index()) { 2226 result = JVM_CONSTANT_String; 2227 } else if (tag.is_method_type_in_error()) { 2228 result = JVM_CONSTANT_MethodType; 2229 } else if (tag.is_method_handle_in_error()) { 2230 result = JVM_CONSTANT_MethodHandle; 2231 } else if (tag.is_dynamic_constant_in_error()) { 2232 result = JVM_CONSTANT_Dynamic; 2233 } 2234 return result; 2235 } 2236 JVM_END 2237 2238 // Assertion support. ////////////////////////////////////////////////////////// 2239 2240 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2241 JVMWrapper("JVM_DesiredAssertionStatus"); 2242 assert(cls != NULL, "bad class"); 2243 2244 oop r = JNIHandles::resolve(cls); 2245 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2246 if (java_lang_Class::is_primitive(r)) return false; 2247 2248 Klass* k = java_lang_Class::as_Klass(r); 2249 assert(k->is_instance_klass(), "must be an instance klass"); 2250 if (!k->is_instance_klass()) return false; 2251 2252 ResourceMark rm(THREAD); 2253 const char* name = k->name()->as_C_string(); 2254 bool system_class = k->class_loader() == NULL; 2255 return JavaAssertions::enabled(name, system_class); 2256 2257 JVM_END 2258 2259 2260 // Return a new AssertionStatusDirectives object with the fields filled in with 2261 // command-line assertion arguments (i.e., -ea, -da). 2262 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2263 JVMWrapper("JVM_AssertionStatusDirectives"); 2264 JvmtiVMObjectAllocEventCollector oam; 2265 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2266 return JNIHandles::make_local(env, asd); 2267 JVM_END 2268 2269 // Verification //////////////////////////////////////////////////////////////////////////////// 2270 2271 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2272 2273 // RedefineClasses support: bug 6214132 caused verification to fail. 2274 // All functions from this section should call the jvmtiThreadSate function: 2275 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2276 // The function returns a Klass* of the _scratch_class if the verifier 2277 // was invoked in the middle of the class redefinition. 2278 // Otherwise it returns its argument value which is the _the_class Klass*. 2279 // Please, refer to the description in the jvmtiThreadSate.hpp. 2280 2281 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2282 JVMWrapper("JVM_GetClassNameUTF"); 2283 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2284 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2285 return k->name()->as_utf8(); 2286 JVM_END 2287 2288 2289 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2290 JVMWrapper("JVM_GetClassCPTypes"); 2291 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2292 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2293 // types will have length zero if this is not an InstanceKlass 2294 // (length is determined by call to JVM_GetClassCPEntriesCount) 2295 if (k->is_instance_klass()) { 2296 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2297 for (int index = cp->length() - 1; index >= 0; index--) { 2298 constantTag tag = cp->tag_at(index); 2299 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2300 } 2301 } 2302 JVM_END 2303 2304 2305 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2306 JVMWrapper("JVM_GetClassCPEntriesCount"); 2307 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2308 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2309 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2310 JVM_END 2311 2312 2313 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2314 JVMWrapper("JVM_GetClassFieldsCount"); 2315 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2316 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2317 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2318 JVM_END 2319 2320 2321 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2322 JVMWrapper("JVM_GetClassMethodsCount"); 2323 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2324 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2325 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2326 JVM_END 2327 2328 2329 // The following methods, used for the verifier, are never called with 2330 // array klasses, so a direct cast to InstanceKlass is safe. 2331 // Typically, these methods are called in a loop with bounds determined 2332 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2333 // zero for arrays. 2334 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2335 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2336 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2337 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2338 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2339 int length = method->checked_exceptions_length(); 2340 if (length > 0) { 2341 CheckedExceptionElement* table= method->checked_exceptions_start(); 2342 for (int i = 0; i < length; i++) { 2343 exceptions[i] = table[i].class_cp_index; 2344 } 2345 } 2346 JVM_END 2347 2348 2349 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2350 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2351 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2352 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2353 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2354 return method->checked_exceptions_length(); 2355 JVM_END 2356 2357 2358 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2359 JVMWrapper("JVM_GetMethodIxByteCode"); 2360 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2361 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2362 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2363 memcpy(code, method->code_base(), method->code_size()); 2364 JVM_END 2365 2366 2367 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2368 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2369 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2370 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2371 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2372 return method->code_size(); 2373 JVM_END 2374 2375 2376 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2377 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2378 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2379 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2380 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2381 ExceptionTable extable(method); 2382 entry->start_pc = extable.start_pc(entry_index); 2383 entry->end_pc = extable.end_pc(entry_index); 2384 entry->handler_pc = extable.handler_pc(entry_index); 2385 entry->catchType = extable.catch_type_index(entry_index); 2386 JVM_END 2387 2388 2389 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2390 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2391 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2392 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2393 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2394 return method->exception_table_length(); 2395 JVM_END 2396 2397 2398 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2399 JVMWrapper("JVM_GetMethodIxModifiers"); 2400 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2401 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2402 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2403 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2404 JVM_END 2405 2406 2407 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2408 JVMWrapper("JVM_GetFieldIxModifiers"); 2409 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2410 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2411 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2412 JVM_END 2413 2414 2415 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2416 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2417 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2418 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2419 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2420 return method->max_locals(); 2421 JVM_END 2422 2423 2424 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2425 JVMWrapper("JVM_GetMethodIxArgsSize"); 2426 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2427 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2428 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2429 return method->size_of_parameters(); 2430 JVM_END 2431 2432 2433 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2434 JVMWrapper("JVM_GetMethodIxMaxStack"); 2435 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2436 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2437 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2438 return method->verifier_max_stack(); 2439 JVM_END 2440 2441 2442 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2443 JVMWrapper("JVM_IsConstructorIx"); 2444 ResourceMark rm(THREAD); 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->name() == vmSymbols::object_initializer_name(); 2449 JVM_END 2450 2451 2452 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2453 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2454 ResourceMark rm(THREAD); 2455 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2456 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2457 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2458 return method->is_overpass(); 2459 JVM_END 2460 2461 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2462 JVMWrapper("JVM_GetMethodIxIxUTF"); 2463 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2464 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2465 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2466 return method->name()->as_utf8(); 2467 JVM_END 2468 2469 2470 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2471 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2472 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2473 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2474 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2475 return method->signature()->as_utf8(); 2476 JVM_END 2477 2478 /** 2479 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2480 * read entries in the constant pool. Since the old verifier always 2481 * works on a copy of the code, it will not see any rewriting that 2482 * may possibly occur in the middle of verification. So it is important 2483 * that nothing it calls tries to use the cpCache instead of the raw 2484 * constant pool, so we must use cp->uncached_x methods when appropriate. 2485 */ 2486 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2487 JVMWrapper("JVM_GetCPFieldNameUTF"); 2488 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2489 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2490 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2491 switch (cp->tag_at(cp_index).value()) { 2492 case JVM_CONSTANT_Fieldref: 2493 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2494 default: 2495 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2496 } 2497 ShouldNotReachHere(); 2498 return NULL; 2499 JVM_END 2500 2501 2502 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2503 JVMWrapper("JVM_GetCPMethodNameUTF"); 2504 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2505 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2506 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2507 switch (cp->tag_at(cp_index).value()) { 2508 case JVM_CONSTANT_InterfaceMethodref: 2509 case JVM_CONSTANT_Methodref: 2510 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2511 default: 2512 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2513 } 2514 ShouldNotReachHere(); 2515 return NULL; 2516 JVM_END 2517 2518 2519 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2520 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2521 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2522 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2523 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2524 switch (cp->tag_at(cp_index).value()) { 2525 case JVM_CONSTANT_InterfaceMethodref: 2526 case JVM_CONSTANT_Methodref: 2527 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2528 default: 2529 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2530 } 2531 ShouldNotReachHere(); 2532 return NULL; 2533 JVM_END 2534 2535 2536 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2537 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2538 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2539 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2540 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2541 switch (cp->tag_at(cp_index).value()) { 2542 case JVM_CONSTANT_Fieldref: 2543 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2544 default: 2545 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2546 } 2547 ShouldNotReachHere(); 2548 return NULL; 2549 JVM_END 2550 2551 2552 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2553 JVMWrapper("JVM_GetCPClassNameUTF"); 2554 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2555 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2556 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2557 Symbol* classname = cp->klass_name_at(cp_index); 2558 return classname->as_utf8(); 2559 JVM_END 2560 2561 2562 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2563 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2564 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2565 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2566 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2567 switch (cp->tag_at(cp_index).value()) { 2568 case JVM_CONSTANT_Fieldref: { 2569 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2570 Symbol* classname = cp->klass_name_at(class_index); 2571 return classname->as_utf8(); 2572 } 2573 default: 2574 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2575 } 2576 ShouldNotReachHere(); 2577 return NULL; 2578 JVM_END 2579 2580 2581 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2582 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2583 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2584 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2585 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2586 switch (cp->tag_at(cp_index).value()) { 2587 case JVM_CONSTANT_Methodref: 2588 case JVM_CONSTANT_InterfaceMethodref: { 2589 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2590 Symbol* classname = cp->klass_name_at(class_index); 2591 return classname->as_utf8(); 2592 } 2593 default: 2594 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2595 } 2596 ShouldNotReachHere(); 2597 return NULL; 2598 JVM_END 2599 2600 2601 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2602 JVMWrapper("JVM_GetCPFieldModifiers"); 2603 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2604 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2605 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2606 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2607 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2608 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2609 switch (cp->tag_at(cp_index).value()) { 2610 case JVM_CONSTANT_Fieldref: { 2611 Symbol* name = cp->uncached_name_ref_at(cp_index); 2612 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2613 InstanceKlass* ik = InstanceKlass::cast(k_called); 2614 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2615 if (fs.name() == name && fs.signature() == signature) { 2616 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2617 } 2618 } 2619 return -1; 2620 } 2621 default: 2622 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2623 } 2624 ShouldNotReachHere(); 2625 return 0; 2626 JVM_END 2627 2628 2629 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2630 JVMWrapper("JVM_GetCPMethodModifiers"); 2631 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2632 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2633 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2634 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2635 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2636 switch (cp->tag_at(cp_index).value()) { 2637 case JVM_CONSTANT_Methodref: 2638 case JVM_CONSTANT_InterfaceMethodref: { 2639 Symbol* name = cp->uncached_name_ref_at(cp_index); 2640 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2641 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2642 int methods_count = methods->length(); 2643 for (int i = 0; i < methods_count; i++) { 2644 Method* method = methods->at(i); 2645 if (method->name() == name && method->signature() == signature) { 2646 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2647 } 2648 } 2649 return -1; 2650 } 2651 default: 2652 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2653 } 2654 ShouldNotReachHere(); 2655 return 0; 2656 JVM_END 2657 2658 2659 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2660 2661 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2662 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2663 JVM_END 2664 2665 2666 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2667 JVMWrapper("JVM_IsSameClassPackage"); 2668 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2669 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2670 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2671 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2672 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2673 JVM_END 2674 2675 // Printing support ////////////////////////////////////////////////// 2676 extern "C" { 2677 2678 ATTRIBUTE_PRINTF(3, 0) 2679 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2680 // Reject count values that are negative signed values converted to 2681 // unsigned; see bug 4399518, 4417214 2682 if ((intptr_t)count <= 0) return -1; 2683 2684 int result = os::vsnprintf(str, count, fmt, args); 2685 if (result > 0 && (size_t)result >= count) { 2686 result = -1; 2687 } 2688 2689 return result; 2690 } 2691 2692 ATTRIBUTE_PRINTF(3, 4) 2693 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2694 va_list args; 2695 int len; 2696 va_start(args, fmt); 2697 len = jio_vsnprintf(str, count, fmt, args); 2698 va_end(args); 2699 return len; 2700 } 2701 2702 ATTRIBUTE_PRINTF(2, 3) 2703 int jio_fprintf(FILE* f, const char *fmt, ...) { 2704 int len; 2705 va_list args; 2706 va_start(args, fmt); 2707 len = jio_vfprintf(f, fmt, args); 2708 va_end(args); 2709 return len; 2710 } 2711 2712 ATTRIBUTE_PRINTF(2, 0) 2713 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2714 if (Arguments::vfprintf_hook() != NULL) { 2715 return Arguments::vfprintf_hook()(f, fmt, args); 2716 } else { 2717 return vfprintf(f, fmt, args); 2718 } 2719 } 2720 2721 ATTRIBUTE_PRINTF(1, 2) 2722 JNIEXPORT int jio_printf(const char *fmt, ...) { 2723 int len; 2724 va_list args; 2725 va_start(args, fmt); 2726 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2727 va_end(args); 2728 return len; 2729 } 2730 2731 // HotSpot specific jio method 2732 void jio_print(const char* s, size_t len) { 2733 // Try to make this function as atomic as possible. 2734 if (Arguments::vfprintf_hook() != NULL) { 2735 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2736 } else { 2737 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2738 size_t count = ::write(defaultStream::output_fd(), s, (int)len); 2739 } 2740 } 2741 2742 } // Extern C 2743 2744 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2745 2746 // In most of the JVM thread support functions we need to access the 2747 // thread through a ThreadsListHandle to prevent it from exiting and 2748 // being reclaimed while we try to operate on it. The exceptions to this 2749 // rule are when operating on the current thread, or if the monitor of 2750 // the target java.lang.Thread is locked at the Java level - in both 2751 // cases the target cannot exit. 2752 2753 static void thread_entry(JavaThread* thread, TRAPS) { 2754 HandleMark hm(THREAD); 2755 Handle obj(THREAD, thread->threadObj()); 2756 JavaValue result(T_VOID); 2757 JavaCalls::call_virtual(&result, 2758 obj, 2759 SystemDictionary::Thread_klass(), 2760 vmSymbols::run_method_name(), 2761 vmSymbols::void_method_signature(), 2762 THREAD); 2763 } 2764 2765 2766 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2767 JVMWrapper("JVM_StartThread"); 2768 JavaThread *native_thread = NULL; 2769 2770 // We cannot hold the Threads_lock when we throw an exception, 2771 // due to rank ordering issues. Example: we might need to grab the 2772 // Heap_lock while we construct the exception. 2773 bool throw_illegal_thread_state = false; 2774 2775 // We must release the Threads_lock before we can post a jvmti event 2776 // in Thread::start. 2777 { 2778 // Ensure that the C++ Thread and OSThread structures aren't freed before 2779 // we operate. 2780 MutexLocker mu(Threads_lock); 2781 2782 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2783 // re-starting an already started thread, so we should usually find 2784 // that the JavaThread is null. However for a JNI attached thread 2785 // there is a small window between the Thread object being created 2786 // (with its JavaThread set) and the update to its threadStatus, so we 2787 // have to check for this 2788 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2789 throw_illegal_thread_state = true; 2790 } else { 2791 // We could also check the stillborn flag to see if this thread was already stopped, but 2792 // for historical reasons we let the thread detect that itself when it starts running 2793 2794 jlong size = 2795 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2796 // Allocate the C++ Thread structure and create the native thread. The 2797 // stack size retrieved from java is 64-bit signed, but the constructor takes 2798 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2799 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2800 // - Avoid passing negative values which would result in really large stacks. 2801 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2802 size_t sz = size > 0 ? (size_t) size : 0; 2803 native_thread = new JavaThread(&thread_entry, sz); 2804 2805 // At this point it may be possible that no osthread was created for the 2806 // JavaThread due to lack of memory. Check for this situation and throw 2807 // an exception if necessary. Eventually we may want to change this so 2808 // that we only grab the lock if the thread was created successfully - 2809 // then we can also do this check and throw the exception in the 2810 // JavaThread constructor. 2811 if (native_thread->osthread() != NULL) { 2812 // Note: the current thread is not being used within "prepare". 2813 native_thread->prepare(jthread); 2814 } 2815 } 2816 } 2817 2818 if (throw_illegal_thread_state) { 2819 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2820 } 2821 2822 assert(native_thread != NULL, "Starting null thread?"); 2823 2824 if (native_thread->osthread() == NULL) { 2825 // No one should hold a reference to the 'native_thread'. 2826 native_thread->smr_delete(); 2827 if (JvmtiExport::should_post_resource_exhausted()) { 2828 JvmtiExport::post_resource_exhausted( 2829 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2830 os::native_thread_creation_failed_msg()); 2831 } 2832 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2833 os::native_thread_creation_failed_msg()); 2834 } 2835 2836 Thread::start(native_thread); 2837 2838 JVM_END 2839 2840 2841 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2842 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2843 // but is thought to be reliable and simple. In the case, where the receiver is the 2844 // same thread as the sender, no VM_Operation is needed. 2845 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2846 JVMWrapper("JVM_StopThread"); 2847 2848 // A nested ThreadsListHandle will grab the Threads_lock so create 2849 // tlh before we resolve throwable. 2850 ThreadsListHandle tlh(thread); 2851 oop java_throwable = JNIHandles::resolve(throwable); 2852 if (java_throwable == NULL) { 2853 THROW(vmSymbols::java_lang_NullPointerException()); 2854 } 2855 oop java_thread = NULL; 2856 JavaThread* receiver = NULL; 2857 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2858 Events::log_exception(thread, 2859 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2860 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2861 2862 if (is_alive) { 2863 // jthread refers to a live JavaThread. 2864 if (thread == receiver) { 2865 // Exception is getting thrown at self so no VM_Operation needed. 2866 THROW_OOP(java_throwable); 2867 } else { 2868 // Use a VM_Operation to throw the exception. 2869 Thread::send_async_exception(java_thread, java_throwable); 2870 } 2871 } else { 2872 // Either: 2873 // - target thread has not been started before being stopped, or 2874 // - target thread already terminated 2875 // We could read the threadStatus to determine which case it is 2876 // but that is overkill as it doesn't matter. We must set the 2877 // stillborn flag for the first case, and if the thread has already 2878 // exited setting this flag has no effect. 2879 java_lang_Thread::set_stillborn(java_thread); 2880 } 2881 JVM_END 2882 2883 2884 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2885 JVMWrapper("JVM_IsThreadAlive"); 2886 2887 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2888 return java_lang_Thread::is_alive(thread_oop); 2889 JVM_END 2890 2891 2892 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2893 JVMWrapper("JVM_SuspendThread"); 2894 2895 ThreadsListHandle tlh(thread); 2896 JavaThread* receiver = NULL; 2897 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2898 if (is_alive) { 2899 // jthread refers to a live JavaThread. 2900 { 2901 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2902 if (receiver->is_external_suspend()) { 2903 // Don't allow nested external suspend requests. We can't return 2904 // an error from this interface so just ignore the problem. 2905 return; 2906 } 2907 if (receiver->is_exiting()) { // thread is in the process of exiting 2908 return; 2909 } 2910 receiver->set_external_suspend(); 2911 } 2912 2913 // java_suspend() will catch threads in the process of exiting 2914 // and will ignore them. 2915 receiver->java_suspend(); 2916 2917 // It would be nice to have the following assertion in all the 2918 // time, but it is possible for a racing resume request to have 2919 // resumed this thread right after we suspended it. Temporarily 2920 // enable this assertion if you are chasing a different kind of 2921 // bug. 2922 // 2923 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2924 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2925 } 2926 JVM_END 2927 2928 2929 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2930 JVMWrapper("JVM_ResumeThread"); 2931 2932 ThreadsListHandle tlh(thread); 2933 JavaThread* receiver = NULL; 2934 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2935 if (is_alive) { 2936 // jthread refers to a live JavaThread. 2937 2938 // This is the original comment for this Threads_lock grab: 2939 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2940 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2941 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2942 // looks at it. 2943 // 2944 // The above comment dates back to when we had both internal and 2945 // external suspend APIs that shared a common underlying mechanism. 2946 // External suspend is now entirely cooperative and doesn't share 2947 // anything with internal suspend. That said, there are some 2948 // assumptions in the VM that an external resume grabs the 2949 // Threads_lock. We can't drop the Threads_lock grab here until we 2950 // resolve the assumptions that exist elsewhere. 2951 // 2952 MutexLocker ml(Threads_lock); 2953 receiver->java_resume(); 2954 } 2955 JVM_END 2956 2957 2958 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2959 JVMWrapper("JVM_SetThreadPriority"); 2960 2961 ThreadsListHandle tlh(thread); 2962 oop java_thread = NULL; 2963 JavaThread* receiver = NULL; 2964 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2965 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2966 2967 if (is_alive) { 2968 // jthread refers to a live JavaThread. 2969 Thread::set_priority(receiver, (ThreadPriority)prio); 2970 } 2971 // Implied else: If the JavaThread hasn't started yet, then the 2972 // priority set in the java.lang.Thread object above will be pushed 2973 // down when it does start. 2974 JVM_END 2975 2976 2977 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2978 JVMWrapper("JVM_Yield"); 2979 if (os::dont_yield()) return; 2980 HOTSPOT_THREAD_YIELD(); 2981 os::naked_yield(); 2982 JVM_END 2983 2984 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) { 2985 assert(event != NULL, "invariant"); 2986 assert(event->should_commit(), "invariant"); 2987 event->set_time(millis); 2988 event->commit(); 2989 } 2990 2991 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2992 JVMWrapper("JVM_Sleep"); 2993 2994 if (millis < 0) { 2995 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2996 } 2997 2998 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 2999 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3000 } 3001 3002 // Save current thread state and restore it at the end of this block. 3003 // And set new thread state to SLEEPING. 3004 JavaThreadSleepState jtss(thread); 3005 3006 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3007 EventThreadSleep event; 3008 3009 if (millis == 0) { 3010 os::naked_yield(); 3011 } else { 3012 ThreadState old_state = thread->osthread()->get_state(); 3013 thread->osthread()->set_state(SLEEPING); 3014 if (!thread->sleep(millis)) { // interrupted 3015 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3016 // us while we were sleeping. We do not overwrite those. 3017 if (!HAS_PENDING_EXCEPTION) { 3018 if (event.should_commit()) { 3019 post_thread_sleep_event(&event, millis); 3020 } 3021 HOTSPOT_THREAD_SLEEP_END(1); 3022 3023 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3024 // to properly restore the thread state. That's likely wrong. 3025 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3026 } 3027 } 3028 thread->osthread()->set_state(old_state); 3029 } 3030 if (event.should_commit()) { 3031 post_thread_sleep_event(&event, millis); 3032 } 3033 HOTSPOT_THREAD_SLEEP_END(0); 3034 JVM_END 3035 3036 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3037 JVMWrapper("JVM_CurrentThread"); 3038 oop jthread = thread->threadObj(); 3039 assert (thread != NULL, "no current thread!"); 3040 return JNIHandles::make_local(env, jthread); 3041 JVM_END 3042 3043 class CountStackFramesTC : public ThreadClosure { 3044 int _count; 3045 bool _suspended; 3046 public: 3047 CountStackFramesTC() : _count(0), _suspended(false) {} 3048 virtual void do_thread(Thread* thread) { 3049 JavaThread* jt = (JavaThread*)thread; 3050 if (!jt->is_external_suspend()) { 3051 // To keep same behavior we fail this operation, 3052 // even if it would work perfectly. 3053 return; 3054 } 3055 _suspended = true; 3056 // Count all java activation, i.e., number of vframes. 3057 for (vframeStream vfst(jt); !vfst.at_end(); vfst.next()) { 3058 // Native frames are not counted. 3059 if (!vfst.method()->is_native()) _count++; 3060 } 3061 } 3062 int count() { return _count; } 3063 int suspended() { return _suspended; } 3064 }; 3065 3066 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3067 JVMWrapper("JVM_CountStackFrames"); 3068 3069 ThreadsListHandle tlh(thread); 3070 JavaThread* receiver = NULL; 3071 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3072 if (is_alive) { 3073 // jthread refers to a live JavaThread. 3074 CountStackFramesTC csf; 3075 Handshake::execute(&csf, receiver); 3076 if (!csf.suspended()) { 3077 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3078 "this thread is not suspended"); 3079 } 3080 return csf.count(); 3081 } 3082 // Implied else: if JavaThread is not alive simply return a count of 0. 3083 return 0; 3084 JVM_END 3085 3086 3087 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3088 JVMWrapper("JVM_Interrupt"); 3089 3090 ThreadsListHandle tlh(thread); 3091 JavaThread* receiver = NULL; 3092 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3093 if (is_alive) { 3094 // jthread refers to a live JavaThread. 3095 receiver->interrupt(); 3096 } 3097 JVM_END 3098 3099 3100 JVM_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3101 JVMWrapper("JVM_IsInterrupted"); 3102 3103 ThreadsListHandle tlh(thread); 3104 JavaThread* receiver = NULL; 3105 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3106 if (is_alive) { 3107 // jthread refers to a live JavaThread. 3108 return (jboolean) receiver->is_interrupted(clear_interrupted != 0); 3109 } else { 3110 return JNI_FALSE; 3111 } 3112 JVM_END 3113 3114 3115 // Return true iff the current thread has locked the object passed in 3116 3117 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3118 JVMWrapper("JVM_HoldsLock"); 3119 assert(THREAD->is_Java_thread(), "sanity check"); 3120 if (obj == NULL) { 3121 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3122 } 3123 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3124 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3125 JVM_END 3126 3127 3128 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3129 JVMWrapper("JVM_DumpAllStacks"); 3130 VM_PrintThreads op; 3131 VMThread::execute(&op); 3132 if (JvmtiExport::should_post_data_dump()) { 3133 JvmtiExport::post_data_dump(); 3134 } 3135 JVM_END 3136 3137 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3138 JVMWrapper("JVM_SetNativeThreadName"); 3139 3140 // We don't use a ThreadsListHandle here because the current thread 3141 // must be alive. 3142 oop java_thread = JNIHandles::resolve_non_null(jthread); 3143 JavaThread* thr = java_lang_Thread::thread(java_thread); 3144 if (thread == thr && !thr->has_attached_via_jni()) { 3145 // Thread naming is only supported for the current thread and 3146 // we don't set the name of an attached thread to avoid stepping 3147 // on other programs. 3148 ResourceMark rm(thread); 3149 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3150 os::set_native_thread_name(thread_name); 3151 } 3152 JVM_END 3153 3154 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3155 3156 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3157 JVMWrapper("JVM_GetClassContext"); 3158 ResourceMark rm(THREAD); 3159 JvmtiVMObjectAllocEventCollector oam; 3160 vframeStream vfst(thread); 3161 3162 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3163 // This must only be called from SecurityManager.getClassContext 3164 Method* m = vfst.method(); 3165 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3166 m->name() == vmSymbols::getClassContext_name() && 3167 m->signature() == vmSymbols::void_class_array_signature())) { 3168 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3169 } 3170 } 3171 3172 // Collect method holders 3173 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3174 for (; !vfst.at_end(); vfst.security_next()) { 3175 Method* m = vfst.method(); 3176 // Native frames are not returned 3177 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3178 Klass* holder = m->method_holder(); 3179 assert(holder->is_klass(), "just checking"); 3180 klass_array->append(holder); 3181 } 3182 } 3183 3184 // Create result array of type [Ljava/lang/Class; 3185 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3186 // Fill in mirrors corresponding to method holders 3187 for (int i = 0; i < klass_array->length(); i++) { 3188 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3189 } 3190 3191 return (jobjectArray) JNIHandles::make_local(env, result); 3192 JVM_END 3193 3194 3195 // java.lang.Package //////////////////////////////////////////////////////////////// 3196 3197 3198 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3199 JVMWrapper("JVM_GetSystemPackage"); 3200 ResourceMark rm(THREAD); 3201 JvmtiVMObjectAllocEventCollector oam; 3202 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3203 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3204 return (jstring) JNIHandles::make_local(result); 3205 JVM_END 3206 3207 3208 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3209 JVMWrapper("JVM_GetSystemPackages"); 3210 JvmtiVMObjectAllocEventCollector oam; 3211 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3212 return (jobjectArray) JNIHandles::make_local(result); 3213 JVM_END 3214 3215 3216 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3217 3218 3219 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3220 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3221 3222 MonitorLocker ml(Heap_lock); 3223 oop ref = Universe::reference_pending_list(); 3224 if (ref != NULL) { 3225 Universe::set_reference_pending_list(NULL); 3226 } 3227 return JNIHandles::make_local(env, ref); 3228 JVM_END 3229 3230 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3231 JVMWrapper("JVM_HasReferencePendingList"); 3232 MonitorLocker ml(Heap_lock); 3233 return Universe::has_reference_pending_list(); 3234 JVM_END 3235 3236 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3237 JVMWrapper("JVM_WaitForReferencePendingList"); 3238 MonitorLocker ml(Heap_lock); 3239 while (!Universe::has_reference_pending_list()) { 3240 ml.wait(); 3241 } 3242 JVM_END 3243 3244 3245 // ObjectInputStream /////////////////////////////////////////////////////////////// 3246 3247 // Return the first user-defined class loader up the execution stack, or null 3248 // if only code from the bootstrap or platform class loader is on the stack. 3249 3250 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3251 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3252 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3253 oop loader = vfst.method()->method_holder()->class_loader(); 3254 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3255 return JNIHandles::make_local(env, loader); 3256 } 3257 } 3258 return NULL; 3259 JVM_END 3260 3261 3262 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3263 3264 3265 // resolve array handle and check arguments 3266 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3267 if (arr == NULL) { 3268 THROW_0(vmSymbols::java_lang_NullPointerException()); 3269 } 3270 oop a = JNIHandles::resolve_non_null(arr); 3271 if (!a->is_array()) { 3272 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3273 } else if (type_array_only && !a->is_typeArray()) { 3274 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3275 } 3276 return arrayOop(a); 3277 } 3278 3279 3280 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3281 JVMWrapper("JVM_GetArrayLength"); 3282 arrayOop a = check_array(env, arr, false, CHECK_0); 3283 return a->length(); 3284 JVM_END 3285 3286 3287 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3288 JVMWrapper("JVM_Array_Get"); 3289 JvmtiVMObjectAllocEventCollector oam; 3290 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3291 jvalue value; 3292 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3293 oop box = Reflection::box(&value, type, CHECK_NULL); 3294 return JNIHandles::make_local(env, box); 3295 JVM_END 3296 3297 3298 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3299 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3300 jvalue value; 3301 value.i = 0; // to initialize value before getting used in CHECK 3302 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3303 assert(a->is_typeArray(), "just checking"); 3304 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3305 BasicType wide_type = (BasicType) wCode; 3306 if (type != wide_type) { 3307 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3308 } 3309 return value; 3310 JVM_END 3311 3312 3313 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3314 JVMWrapper("JVM_SetArrayElement"); 3315 arrayOop a = check_array(env, arr, false, CHECK); 3316 oop box = JNIHandles::resolve(val); 3317 jvalue value; 3318 value.i = 0; // to initialize value before getting used in CHECK 3319 BasicType value_type; 3320 if (a->is_objArray()) { 3321 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3322 value_type = Reflection::unbox_for_regular_object(box, &value); 3323 } else { 3324 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3325 } 3326 Reflection::array_set(&value, a, index, value_type, CHECK); 3327 JVM_END 3328 3329 3330 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3331 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3332 arrayOop a = check_array(env, arr, true, CHECK); 3333 assert(a->is_typeArray(), "just checking"); 3334 BasicType value_type = (BasicType) vCode; 3335 Reflection::array_set(&v, a, index, value_type, CHECK); 3336 JVM_END 3337 3338 3339 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3340 JVMWrapper("JVM_NewArray"); 3341 JvmtiVMObjectAllocEventCollector oam; 3342 oop element_mirror = JNIHandles::resolve(eltClass); 3343 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3344 return JNIHandles::make_local(env, result); 3345 JVM_END 3346 3347 3348 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3349 JVMWrapper("JVM_NewMultiArray"); 3350 JvmtiVMObjectAllocEventCollector oam; 3351 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3352 oop element_mirror = JNIHandles::resolve(eltClass); 3353 assert(dim_array->is_typeArray(), "just checking"); 3354 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3355 return JNIHandles::make_local(env, result); 3356 JVM_END 3357 3358 3359 // Library support /////////////////////////////////////////////////////////////////////////// 3360 3361 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3362 //%note jvm_ct 3363 JVMWrapper("JVM_LoadLibrary"); 3364 char ebuf[1024]; 3365 void *load_result; 3366 { 3367 ThreadToNativeFromVM ttnfvm(thread); 3368 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3369 } 3370 if (load_result == NULL) { 3371 char msg[1024]; 3372 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3373 // Since 'ebuf' may contain a string encoded using 3374 // platform encoding scheme, we need to pass 3375 // Exceptions::unsafe_to_utf8 to the new_exception method 3376 // as the last argument. See bug 6367357. 3377 Handle h_exception = 3378 Exceptions::new_exception(thread, 3379 vmSymbols::java_lang_UnsatisfiedLinkError(), 3380 msg, Exceptions::unsafe_to_utf8); 3381 3382 THROW_HANDLE_0(h_exception); 3383 } 3384 return load_result; 3385 JVM_END 3386 3387 3388 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3389 JVMWrapper("JVM_UnloadLibrary"); 3390 os::dll_unload(handle); 3391 JVM_END 3392 3393 3394 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3395 JVMWrapper("JVM_FindLibraryEntry"); 3396 return os::dll_lookup(handle, name); 3397 JVM_END 3398 3399 3400 // JNI version /////////////////////////////////////////////////////////////////////////////// 3401 3402 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3403 JVMWrapper("JVM_IsSupportedJNIVersion"); 3404 return Threads::is_supported_jni_version_including_1_1(version); 3405 JVM_END 3406 3407 3408 // String support /////////////////////////////////////////////////////////////////////////// 3409 3410 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3411 JVMWrapper("JVM_InternString"); 3412 JvmtiVMObjectAllocEventCollector oam; 3413 if (str == NULL) return NULL; 3414 oop string = JNIHandles::resolve_non_null(str); 3415 oop result = StringTable::intern(string, CHECK_NULL); 3416 return (jstring) JNIHandles::make_local(env, result); 3417 JVM_END 3418 3419 3420 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3421 3422 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3423 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3424 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3425 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3426 // nature. JavaThreads will be "in native" when using this API from JDK code. 3427 3428 3429 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3430 VM_Exit::block_if_vm_exited(); 3431 JVMWrapper("JVM_RawMonitorCreate"); 3432 return new os::PlatformMutex(); 3433 } 3434 3435 3436 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3437 VM_Exit::block_if_vm_exited(); 3438 JVMWrapper("JVM_RawMonitorDestroy"); 3439 delete ((os::PlatformMutex*) mon); 3440 } 3441 3442 3443 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3444 VM_Exit::block_if_vm_exited(); 3445 JVMWrapper("JVM_RawMonitorEnter"); 3446 ((os::PlatformMutex*) mon)->lock(); 3447 return 0; 3448 } 3449 3450 3451 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3452 VM_Exit::block_if_vm_exited(); 3453 JVMWrapper("JVM_RawMonitorExit"); 3454 ((os::PlatformMutex*) mon)->unlock(); 3455 } 3456 3457 3458 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3459 3460 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3461 Handle loader, Handle protection_domain, 3462 jboolean throwError, TRAPS) { 3463 // Security Note: 3464 // The Java level wrapper will perform the necessary security check allowing 3465 // us to pass the NULL as the initiating class loader. The VM is responsible for 3466 // the checkPackageAccess relative to the initiating class loader via the 3467 // protection_domain. The protection_domain is passed as NULL by the java code 3468 // if there is no security manager in 3-arg Class.forName(). 3469 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3470 3471 // Check if we should initialize the class 3472 if (init && klass->is_instance_klass()) { 3473 klass->initialize(CHECK_NULL); 3474 } 3475 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3476 } 3477 3478 3479 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3480 3481 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3482 JVMWrapper("JVM_InvokeMethod"); 3483 Handle method_handle; 3484 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3485 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3486 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3487 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3488 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3489 jobject res = JNIHandles::make_local(env, result); 3490 if (JvmtiExport::should_post_vm_object_alloc()) { 3491 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3492 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3493 if (java_lang_Class::is_primitive(ret_type)) { 3494 // Only for primitive type vm allocates memory for java object. 3495 // See box() method. 3496 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3497 } 3498 } 3499 return res; 3500 } else { 3501 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3502 } 3503 JVM_END 3504 3505 3506 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3507 JVMWrapper("JVM_NewInstanceFromConstructor"); 3508 oop constructor_mirror = JNIHandles::resolve(c); 3509 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3510 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3511 jobject res = JNIHandles::make_local(env, result); 3512 if (JvmtiExport::should_post_vm_object_alloc()) { 3513 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3514 } 3515 return res; 3516 JVM_END 3517 3518 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3519 3520 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3521 JVMWrapper("JVM_SupportsCX8"); 3522 return VM_Version::supports_cx8(); 3523 JVM_END 3524 3525 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3526 JVMWrapper("JVM_InitializeFromArchive"); 3527 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3528 assert(k->is_klass(), "just checking"); 3529 HeapShared::initialize_from_archived_subgraph(k); 3530 JVM_END 3531 3532 // Returns an array of all live Thread objects (VM internal JavaThreads, 3533 // jvmti agent threads, and JNI attaching threads are skipped) 3534 // See CR 6404306 regarding JNI attaching threads 3535 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3536 ResourceMark rm(THREAD); 3537 ThreadsListEnumerator tle(THREAD, false, false); 3538 JvmtiVMObjectAllocEventCollector oam; 3539 3540 int num_threads = tle.num_threads(); 3541 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3542 objArrayHandle threads_ah(THREAD, r); 3543 3544 for (int i = 0; i < num_threads; i++) { 3545 Handle h = tle.get_threadObj(i); 3546 threads_ah->obj_at_put(i, h()); 3547 } 3548 3549 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3550 JVM_END 3551 3552 3553 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3554 // Return StackTraceElement[][], each element is the stack trace of a thread in 3555 // the corresponding entry in the given threads array 3556 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3557 JVMWrapper("JVM_DumpThreads"); 3558 JvmtiVMObjectAllocEventCollector oam; 3559 3560 // Check if threads is null 3561 if (threads == NULL) { 3562 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3563 } 3564 3565 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3566 objArrayHandle ah(THREAD, a); 3567 int num_threads = ah->length(); 3568 // check if threads is non-empty array 3569 if (num_threads == 0) { 3570 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3571 } 3572 3573 // check if threads is not an array of objects of Thread class 3574 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3575 if (k != SystemDictionary::Thread_klass()) { 3576 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3577 } 3578 3579 ResourceMark rm(THREAD); 3580 3581 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3582 for (int i = 0; i < num_threads; i++) { 3583 oop thread_obj = ah->obj_at(i); 3584 instanceHandle h(THREAD, (instanceOop) thread_obj); 3585 thread_handle_array->append(h); 3586 } 3587 3588 // The JavaThread references in thread_handle_array are validated 3589 // in VM_ThreadDump::doit(). 3590 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3591 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3592 3593 JVM_END 3594 3595 // JVM monitoring and management support 3596 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3597 return Management::get_jmm_interface(version); 3598 JVM_END 3599 3600 // com.sun.tools.attach.VirtualMachine agent properties support 3601 // 3602 // Initialize the agent properties with the properties maintained in the VM 3603 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3604 JVMWrapper("JVM_InitAgentProperties"); 3605 ResourceMark rm; 3606 3607 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3608 3609 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3610 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3611 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3612 return properties; 3613 JVM_END 3614 3615 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3616 { 3617 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3618 JvmtiVMObjectAllocEventCollector oam; 3619 3620 if (ofClass == NULL) { 3621 return NULL; 3622 } 3623 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3624 // Special handling for primitive objects 3625 if (java_lang_Class::is_primitive(mirror())) { 3626 return NULL; 3627 } 3628 Klass* k = java_lang_Class::as_Klass(mirror()); 3629 if (!k->is_instance_klass()) { 3630 return NULL; 3631 } 3632 InstanceKlass* ik = InstanceKlass::cast(k); 3633 int encl_method_class_idx = ik->enclosing_method_class_index(); 3634 if (encl_method_class_idx == 0) { 3635 return NULL; 3636 } 3637 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3638 objArrayHandle dest(THREAD, dest_o); 3639 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3640 dest->obj_at_put(0, enc_k->java_mirror()); 3641 int encl_method_method_idx = ik->enclosing_method_method_index(); 3642 if (encl_method_method_idx != 0) { 3643 Symbol* sym = ik->constants()->symbol_at( 3644 extract_low_short_from_int( 3645 ik->constants()->name_and_type_at(encl_method_method_idx))); 3646 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3647 dest->obj_at_put(1, str()); 3648 sym = ik->constants()->symbol_at( 3649 extract_high_short_from_int( 3650 ik->constants()->name_and_type_at(encl_method_method_idx))); 3651 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3652 dest->obj_at_put(2, str()); 3653 } 3654 return (jobjectArray) JNIHandles::make_local(dest()); 3655 } 3656 JVM_END 3657 3658 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3659 { 3660 memset(info, 0, info_size); 3661 3662 info->jvm_version = VM_Version::jvm_version(); 3663 info->patch_version = VM_Version::vm_patch_version(); 3664 3665 // when we add a new capability in the jvm_version_info struct, we should also 3666 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3667 // counter defined in runtimeService.cpp. 3668 info->is_attach_supported = AttachListener::is_attach_supported(); 3669 } 3670 JVM_END 3671 3672 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3673 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3674 ResourceMark rm(THREAD); 3675 3676 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3677 return NULL; 3678 } 3679 3680 char** vm_flags = Arguments::jvm_flags_array(); 3681 char** vm_args = Arguments::jvm_args_array(); 3682 int num_flags = Arguments::num_jvm_flags(); 3683 int num_args = Arguments::num_jvm_args(); 3684 3685 InstanceKlass* ik = SystemDictionary::String_klass(); 3686 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3687 objArrayHandle result_h(THREAD, r); 3688 3689 int index = 0; 3690 for (int j = 0; j < num_flags; j++, index++) { 3691 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3692 result_h->obj_at_put(index, h()); 3693 } 3694 for (int i = 0; i < num_args; i++, index++) { 3695 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3696 result_h->obj_at_put(index, h()); 3697 } 3698 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3699 JVM_END 3700 3701 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3702 return os::get_signal_number(name); 3703 JVM_END