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.inline.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/os.inline.hpp" 74 #include "runtime/perfData.hpp" 75 #include "runtime/reflection.hpp" 76 #include "runtime/thread.inline.hpp" 77 #include "runtime/threadSMR.hpp" 78 #include "runtime/vframe.inline.hpp" 79 #include "runtime/vmOperations.hpp" 80 #include "runtime/vm_version.hpp" 81 #include "services/attachListener.hpp" 82 #include "services/management.hpp" 83 #include "services/threadService.hpp" 84 #include "utilities/copy.hpp" 85 #include "utilities/defaultStream.hpp" 86 #include "utilities/dtrace.hpp" 87 #include "utilities/events.hpp" 88 #include "utilities/histogram.hpp" 89 #include "utilities/macros.hpp" 90 #include "utilities/utf8.hpp" 91 #if INCLUDE_CDS 92 #include "classfile/systemDictionaryShared.hpp" 93 #endif 94 95 #include <errno.h> 96 97 /* 98 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 99 such ctors and calls MUST NOT come between an oop declaration/init and its 100 usage because if objects are move this may cause various memory stomps, bus 101 errors and segfaults. Here is a cookbook for causing so called "naked oop 102 failures": 103 104 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 105 JVMWrapper("JVM_GetClassDeclaredFields"); 106 107 // Object address to be held directly in mirror & not visible to GC 108 oop mirror = JNIHandles::resolve_non_null(ofClass); 109 110 // If this ctor can hit a safepoint, moving objects around, then 111 ComplexConstructor foo; 112 113 // Boom! mirror may point to JUNK instead of the intended object 114 (some dereference of mirror) 115 116 // Here's another call that may block for GC, making mirror stale 117 MutexLocker ml(some_lock); 118 119 // And here's an initializer that can result in a stale oop 120 // all in one step. 121 oop o = call_that_can_throw_exception(TRAPS); 122 123 124 The solution is to keep the oop declaration BELOW the ctor or function 125 call that might cause a GC, do another resolve to reassign the oop, or 126 consider use of a Handle instead of an oop so there is immunity from object 127 motion. But note that the "QUICK" entries below do not have a handlemark 128 and thus can only support use of handles passed in. 129 */ 130 131 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 132 ResourceMark rm; 133 int line_number = -1; 134 const char * source_file = NULL; 135 const char * trace = "explicit"; 136 InstanceKlass* caller = NULL; 137 JavaThread* jthread = JavaThread::current(); 138 if (jthread->has_last_Java_frame()) { 139 vframeStream vfst(jthread); 140 141 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 142 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController"); 143 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 144 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction"); 145 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 146 147 Method* last_caller = NULL; 148 149 while (!vfst.at_end()) { 150 Method* m = vfst.method(); 151 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 152 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 153 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 154 break; 155 } 156 last_caller = m; 157 vfst.next(); 158 } 159 // if this is called from Class.forName0 and that is called from Class.forName, 160 // then print the caller of Class.forName. If this is Class.loadClass, then print 161 // that caller, otherwise keep quiet since this should be picked up elsewhere. 162 bool found_it = false; 163 if (!vfst.at_end() && 164 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 165 vfst.method()->name() == vmSymbols::forName0_name()) { 166 vfst.next(); 167 if (!vfst.at_end() && 168 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 169 vfst.method()->name() == vmSymbols::forName_name()) { 170 vfst.next(); 171 found_it = true; 172 } 173 } else if (last_caller != NULL && 174 last_caller->method_holder()->name() == 175 vmSymbols::java_lang_ClassLoader() && 176 last_caller->name() == vmSymbols::loadClass_name()) { 177 found_it = true; 178 } else if (!vfst.at_end()) { 179 if (vfst.method()->is_native()) { 180 // JNI call 181 found_it = true; 182 } 183 } 184 if (found_it && !vfst.at_end()) { 185 // found the caller 186 caller = vfst.method()->method_holder(); 187 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 188 if (line_number == -1) { 189 // show method name if it's a native method 190 trace = vfst.method()->name_and_sig_as_C_string(); 191 } 192 Symbol* s = caller->source_file_name(); 193 if (s != NULL) { 194 source_file = s->as_C_string(); 195 } 196 } 197 } 198 if (caller != NULL) { 199 if (to_class != caller) { 200 const char * from = caller->external_name(); 201 const char * to = to_class->external_name(); 202 // print in a single call to reduce interleaving between threads 203 if (source_file != NULL) { 204 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 205 } else { 206 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 207 } 208 } 209 } 210 } 211 212 void trace_class_resolution(Klass* to_class) { 213 EXCEPTION_MARK; 214 trace_class_resolution_impl(to_class, THREAD); 215 if (HAS_PENDING_EXCEPTION) { 216 CLEAR_PENDING_EXCEPTION; 217 } 218 } 219 220 // Wrapper to trace JVM functions 221 222 #ifdef ASSERT 223 Histogram* JVMHistogram; 224 volatile int JVMHistogram_lock = 0; 225 226 class JVMHistogramElement : public HistogramElement { 227 public: 228 JVMHistogramElement(const char* name); 229 }; 230 231 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 232 _name = elementName; 233 uintx count = 0; 234 235 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) { 236 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) { 237 count +=1; 238 if ( (WarnOnStalledSpinLock > 0) 239 && (count % WarnOnStalledSpinLock == 0)) { 240 warning("JVMHistogram_lock seems to be stalled"); 241 } 242 } 243 } 244 245 if(JVMHistogram == NULL) 246 JVMHistogram = new Histogram("JVM Call Counts",100); 247 248 JVMHistogram->add_element(this); 249 Atomic::dec(&JVMHistogram_lock); 250 } 251 252 #define JVMCountWrapper(arg) \ 253 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 254 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 255 256 #define JVMWrapper(arg) JVMCountWrapper(arg); 257 #else 258 #define JVMWrapper(arg) 259 #endif 260 261 262 // Interface version ///////////////////////////////////////////////////////////////////// 263 264 265 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 266 return JVM_INTERFACE_VERSION; 267 JVM_END 268 269 270 // java.lang.System ////////////////////////////////////////////////////////////////////// 271 272 273 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 274 JVMWrapper("JVM_CurrentTimeMillis"); 275 return os::javaTimeMillis(); 276 JVM_END 277 278 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 279 JVMWrapper("JVM_NanoTime"); 280 return os::javaTimeNanos(); 281 JVM_END 282 283 // The function below is actually exposed by jdk.internal.misc.VM and not 284 // java.lang.System, but we choose to keep it here so that it stays next 285 // to JVM_CurrentTimeMillis and JVM_NanoTime 286 287 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 288 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 289 290 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 291 JVMWrapper("JVM_GetNanoTimeAdjustment"); 292 jlong seconds; 293 jlong nanos; 294 295 os::javaTimeSystemUTC(seconds, nanos); 296 297 // We're going to verify that the result can fit in a long. 298 // For that we need the difference in seconds between 'seconds' 299 // and 'offset_secs' to be such that: 300 // |seconds - offset_secs| < (2^63/10^9) 301 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 302 // which makes |seconds - offset_secs| < 2^33 303 // and we will prefer +/- 2^32 as the maximum acceptable diff 304 // as 2^32 has a more natural feel than 2^33... 305 // 306 // So if |seconds - offset_secs| >= 2^32 - we return a special 307 // sentinel value (-1) which the caller should take as an 308 // exception value indicating that the offset given to us is 309 // too far from range of the current time - leading to too big 310 // a nano adjustment. The caller is expected to recover by 311 // computing a more accurate offset and calling this method 312 // again. (For the record 2^32 secs is ~136 years, so that 313 // should rarely happen) 314 // 315 jlong diff = seconds - offset_secs; 316 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 317 return -1; // sentinel value: the offset is too far off the target 318 } 319 320 // return the adjustment. If you compute a time by adding 321 // this number of nanoseconds along with the number of seconds 322 // in the offset you should get the current UTC time. 323 return (diff * (jlong)1000000000) + nanos; 324 JVM_END 325 326 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 327 jobject dst, jint dst_pos, jint length)) 328 JVMWrapper("JVM_ArrayCopy"); 329 // Check if we have null pointers 330 if (src == NULL || dst == NULL) { 331 THROW(vmSymbols::java_lang_NullPointerException()); 332 } 333 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 334 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 335 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 336 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 337 // Do copy 338 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 339 JVM_END 340 341 342 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 343 JavaValue r(T_OBJECT); 344 // public synchronized Object put(Object key, Object value); 345 HandleMark hm(THREAD); 346 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 347 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 348 JavaCalls::call_virtual(&r, 349 props, 350 SystemDictionary::Properties_klass(), 351 vmSymbols::put_name(), 352 vmSymbols::object_object_object_signature(), 353 key_str, 354 value_str, 355 THREAD); 356 } 357 358 359 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 360 361 /* 362 * Return all of the system properties in a Java String array with alternating 363 * names and values from the jvm SystemProperty. 364 * Which includes some internal and all commandline -D defined properties. 365 */ 366 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 367 JVMWrapper("JVM_GetProperties"); 368 ResourceMark rm(THREAD); 369 HandleMark hm(THREAD); 370 int ndx = 0; 371 int fixedCount = 2; 372 373 SystemProperty* p = Arguments::system_properties(); 374 int count = Arguments::PropertyList_count(p); 375 376 // Allocate result String array 377 InstanceKlass* ik = SystemDictionary::String_klass(); 378 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 379 objArrayHandle result_h(THREAD, r); 380 381 while (p != NULL) { 382 const char * key = p->key(); 383 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 384 const char * value = p->value(); 385 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 386 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL); 387 result_h->obj_at_put(ndx * 2, key_str()); 388 result_h->obj_at_put(ndx * 2 + 1, value_str()); 389 ndx++; 390 } 391 p = p->next(); 392 } 393 394 // Convert the -XX:MaxDirectMemorySize= command line flag 395 // to the sun.nio.MaxDirectMemorySize property. 396 // Do this after setting user properties to prevent people 397 // from setting the value with a -D option, as requested. 398 // Leave empty if not supplied 399 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 400 char as_chars[256]; 401 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 402 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 403 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 404 result_h->obj_at_put(ndx * 2, key_str()); 405 result_h->obj_at_put(ndx * 2 + 1, value_str()); 406 ndx++; 407 } 408 409 // JVM monitoring and management support 410 // Add the sun.management.compiler property for the compiler's name 411 { 412 #undef CSIZE 413 #if defined(_LP64) || defined(_WIN64) 414 #define CSIZE "64-Bit " 415 #else 416 #define CSIZE 417 #endif // 64bit 418 419 #ifdef TIERED 420 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 421 #else 422 #if defined(COMPILER1) 423 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 424 #elif defined(COMPILER2) 425 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 426 #elif INCLUDE_JVMCI 427 #error "INCLUDE_JVMCI should imply TIERED" 428 #else 429 const char* compiler_name = ""; 430 #endif // compilers 431 #endif // TIERED 432 433 if (*compiler_name != '\0' && 434 (Arguments::mode() != Arguments::_int)) { 435 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 436 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 437 result_h->obj_at_put(ndx * 2, key_str()); 438 result_h->obj_at_put(ndx * 2 + 1, value_str()); 439 ndx++; 440 } 441 } 442 443 return (jobjectArray) JNIHandles::make_local(env, result_h()); 444 JVM_END 445 446 447 /* 448 * Return the temporary directory that the VM uses for the attach 449 * and perf data files. 450 * 451 * It is important that this directory is well-known and the 452 * same for all VM instances. It cannot be affected by configuration 453 * variables such as java.io.tmpdir. 454 */ 455 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 456 JVMWrapper("JVM_GetTemporaryDirectory"); 457 HandleMark hm(THREAD); 458 const char* temp_dir = os::get_temp_directory(); 459 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 460 return (jstring) JNIHandles::make_local(env, h()); 461 JVM_END 462 463 464 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 465 466 extern volatile jint vm_created; 467 468 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 469 JVMWrapper("JVM_BeforeHalt"); 470 EventShutdown event; 471 if (event.should_commit()) { 472 event.set_reason("Shutdown requested from Java"); 473 event.commit(); 474 } 475 JVM_END 476 477 478 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 479 before_exit(thread); 480 vm_exit(code); 481 JVM_END 482 483 484 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 485 JVMWrapper("JVM_GC"); 486 if (!DisableExplicitGC) { 487 Universe::heap()->collect(GCCause::_java_lang_system_gc); 488 } 489 JVM_END 490 491 492 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 493 JVMWrapper("JVM_MaxObjectInspectionAge"); 494 return Universe::heap()->millis_since_last_gc(); 495 JVM_END 496 497 498 static inline jlong convert_size_t_to_jlong(size_t val) { 499 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 500 NOT_LP64 (return (jlong)val;) 501 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 502 } 503 504 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 505 JVMWrapper("JVM_TotalMemory"); 506 size_t n = Universe::heap()->capacity(); 507 return convert_size_t_to_jlong(n); 508 JVM_END 509 510 511 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 512 JVMWrapper("JVM_FreeMemory"); 513 size_t n = Universe::heap()->unused(); 514 return convert_size_t_to_jlong(n); 515 JVM_END 516 517 518 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 519 JVMWrapper("JVM_MaxMemory"); 520 size_t n = Universe::heap()->max_capacity(); 521 return convert_size_t_to_jlong(n); 522 JVM_END 523 524 525 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 526 JVMWrapper("JVM_ActiveProcessorCount"); 527 return os::active_processor_count(); 528 JVM_END 529 530 531 532 // java.lang.Throwable ////////////////////////////////////////////////////// 533 534 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 535 JVMWrapper("JVM_FillInStackTrace"); 536 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 537 java_lang_Throwable::fill_in_stack_trace(exception); 538 JVM_END 539 540 // java.lang.NullPointerException /////////////////////////////////////////// 541 542 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 543 if (!ShowCodeDetailsInExceptionMessages) return NULL; 544 545 oop exc = JNIHandles::resolve_non_null(throwable); 546 547 Method* method; 548 int bci; 549 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 550 return NULL; 551 } 552 if (method->is_native()) { 553 return NULL; 554 } 555 556 stringStream ss; 557 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 558 if (ok) { 559 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_0); 560 return (jstring) JNIHandles::make_local(env, result); 561 } else { 562 return NULL; 563 } 564 JVM_END 565 566 // java.lang.StackTraceElement ////////////////////////////////////////////// 567 568 569 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 570 JVMWrapper("JVM_InitStackTraceElementArray"); 571 Handle exception(THREAD, JNIHandles::resolve(throwable)); 572 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 573 objArrayHandle stack_trace(THREAD, st); 574 // Fill in the allocated stack trace 575 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 576 JVM_END 577 578 579 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 580 JVMWrapper("JVM_InitStackTraceElement"); 581 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 582 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 583 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 584 JVM_END 585 586 587 // java.lang.StackWalker ////////////////////////////////////////////////////// 588 589 590 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 591 jint skip_frames, jint frame_count, jint start_index, 592 jobjectArray frames)) 593 JVMWrapper("JVM_CallStackWalk"); 594 JavaThread* jt = (JavaThread*) THREAD; 595 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 596 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 597 } 598 599 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 600 601 // frames array is a Class<?>[] array when only getting caller reference, 602 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 603 // be null. 604 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 605 objArrayHandle frames_array_h(THREAD, fa); 606 607 int limit = start_index + frame_count; 608 if (frames_array_h->length() < limit) { 609 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 610 } 611 612 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 613 start_index, frames_array_h, CHECK_NULL); 614 return JNIHandles::make_local(env, result); 615 JVM_END 616 617 618 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 619 jint frame_count, jint start_index, 620 jobjectArray frames)) 621 JVMWrapper("JVM_MoreStackWalk"); 622 JavaThread* jt = (JavaThread*) THREAD; 623 624 // frames array is a Class<?>[] array when only getting caller reference, 625 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 626 // be null. 627 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 628 objArrayHandle frames_array_h(THREAD, fa); 629 630 int limit = start_index+frame_count; 631 if (frames_array_h->length() < limit) { 632 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 633 } 634 635 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 636 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 637 start_index, frames_array_h, THREAD); 638 JVM_END 639 640 // java.lang.Object /////////////////////////////////////////////// 641 642 643 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 644 JVMWrapper("JVM_IHashCode"); 645 // as implemented in the classic virtual machine; return 0 if object is NULL 646 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 647 JVM_END 648 649 650 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 651 JVMWrapper("JVM_MonitorWait"); 652 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 653 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 654 if (JvmtiExport::should_post_monitor_wait()) { 655 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 656 657 // The current thread already owns the monitor and it has not yet 658 // been added to the wait queue so the current thread cannot be 659 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 660 // event handler cannot accidentally consume an unpark() meant for 661 // the ParkEvent associated with this ObjectMonitor. 662 } 663 ObjectSynchronizer::wait(obj, ms, CHECK); 664 JVM_END 665 666 667 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 668 JVMWrapper("JVM_MonitorNotify"); 669 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 670 ObjectSynchronizer::notify(obj, CHECK); 671 JVM_END 672 673 674 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 675 JVMWrapper("JVM_MonitorNotifyAll"); 676 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 677 ObjectSynchronizer::notifyall(obj, CHECK); 678 JVM_END 679 680 681 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 682 JVMWrapper("JVM_Clone"); 683 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 684 Klass* klass = obj->klass(); 685 JvmtiVMObjectAllocEventCollector oam; 686 687 #ifdef ASSERT 688 // Just checking that the cloneable flag is set correct 689 if (obj->is_array()) { 690 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 691 } else { 692 guarantee(obj->is_instance(), "should be instanceOop"); 693 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 694 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 695 } 696 #endif 697 698 // Check if class of obj supports the Cloneable interface. 699 // All arrays are considered to be cloneable (See JLS 20.1.5). 700 // All j.l.r.Reference classes are considered non-cloneable. 701 if (!klass->is_cloneable() || 702 (klass->is_instance_klass() && 703 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 704 ResourceMark rm(THREAD); 705 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 706 } 707 708 // Make shallow object copy 709 const int size = obj->size(); 710 oop new_obj_oop = NULL; 711 if (obj->is_array()) { 712 const int length = ((arrayOop)obj())->length(); 713 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 714 /* do_zero */ true, CHECK_NULL); 715 } else { 716 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 717 } 718 719 HeapAccess<>::clone(obj(), new_obj_oop, size); 720 721 Handle new_obj(THREAD, new_obj_oop); 722 // Caution: this involves a java upcall, so the clone should be 723 // "gc-robust" by this stage. 724 if (klass->has_finalizer()) { 725 assert(obj->is_instance(), "should be instanceOop"); 726 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 727 new_obj = Handle(THREAD, new_obj_oop); 728 } 729 730 return JNIHandles::make_local(env, new_obj()); 731 JVM_END 732 733 // java.io.File /////////////////////////////////////////////////////////////// 734 735 JVM_LEAF(char*, JVM_NativePath(char* path)) 736 JVMWrapper("JVM_NativePath"); 737 return os::native_path(path); 738 JVM_END 739 740 741 // Misc. class handling /////////////////////////////////////////////////////////// 742 743 744 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 745 JVMWrapper("JVM_GetCallerClass"); 746 747 // Getting the class of the caller frame. 748 // 749 // The call stack at this point looks something like this: 750 // 751 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 752 // [1] [ @CallerSensitive API.method ] 753 // [.] [ (skipped intermediate frames) ] 754 // [n] [ caller ] 755 vframeStream vfst(thread); 756 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 757 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 758 Method* m = vfst.method(); 759 assert(m != NULL, "sanity"); 760 switch (n) { 761 case 0: 762 // This must only be called from Reflection.getCallerClass 763 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 764 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 765 } 766 // fall-through 767 case 1: 768 // Frame 0 and 1 must be caller sensitive. 769 if (!m->caller_sensitive()) { 770 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 771 } 772 break; 773 default: 774 if (!m->is_ignored_by_security_stack_walk()) { 775 // We have reached the desired frame; return the holder class. 776 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 777 } 778 break; 779 } 780 } 781 return NULL; 782 JVM_END 783 784 785 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 786 JVMWrapper("JVM_FindPrimitiveClass"); 787 oop mirror = NULL; 788 BasicType t = name2type(utf); 789 if (t != T_ILLEGAL && !is_reference_type(t)) { 790 mirror = Universe::java_mirror(t); 791 } 792 if (mirror == NULL) { 793 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 794 } else { 795 return (jclass) JNIHandles::make_local(env, mirror); 796 } 797 JVM_END 798 799 800 // Returns a class loaded by the bootstrap class loader; or null 801 // if not found. ClassNotFoundException is not thrown. 802 // FindClassFromBootLoader is exported to the launcher for windows. 803 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 804 const char* name)) 805 JVMWrapper("JVM_FindClassFromBootLoader"); 806 807 // Java libraries should ensure that name is never null... 808 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 809 // It's impossible to create this class; the name cannot fit 810 // into the constant pool. 811 return NULL; 812 } 813 814 TempNewSymbol h_name = SymbolTable::new_symbol(name); 815 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 816 if (k == NULL) { 817 return NULL; 818 } 819 820 if (log_is_enabled(Debug, class, resolve)) { 821 trace_class_resolution(k); 822 } 823 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 824 JVM_END 825 826 // Find a class with this name in this loader, using the caller's protection domain. 827 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 828 jboolean init, jobject loader, 829 jclass caller)) 830 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 831 // Java libraries should ensure that name is never null... 832 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 833 // It's impossible to create this class; the name cannot fit 834 // into the constant pool. 835 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 836 } 837 838 TempNewSymbol h_name = SymbolTable::new_symbol(name); 839 840 oop loader_oop = JNIHandles::resolve(loader); 841 oop from_class = JNIHandles::resolve(caller); 842 oop protection_domain = NULL; 843 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 844 // NPE. Put it in another way, the bootstrap class loader has all permission and 845 // thus no checkPackageAccess equivalence in the VM class loader. 846 // The caller is also passed as NULL by the java code if there is no security 847 // manager to avoid the performance cost of getting the calling class. 848 if (from_class != NULL && loader_oop != NULL) { 849 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 850 } 851 852 Handle h_loader(THREAD, loader_oop); 853 Handle h_prot(THREAD, protection_domain); 854 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 855 h_prot, false, THREAD); 856 857 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 858 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 859 } 860 return result; 861 JVM_END 862 863 // Currently only called from the old verifier. 864 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 865 jboolean init, jclass from)) 866 JVMWrapper("JVM_FindClassFromClass"); 867 if (name == NULL) { 868 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 869 } 870 if ((int)strlen(name) > Symbol::max_length()) { 871 // It's impossible to create this class; the name cannot fit 872 // into the constant pool. 873 Exceptions::fthrow(THREAD_AND_LOCATION, 874 vmSymbols::java_lang_NoClassDefFoundError(), 875 "Class name exceeds maximum length of %d: %s", 876 Symbol::max_length(), 877 name); 878 return 0; 879 } 880 TempNewSymbol h_name = SymbolTable::new_symbol(name); 881 oop from_class_oop = JNIHandles::resolve(from); 882 Klass* from_class = (from_class_oop == NULL) 883 ? (Klass*)NULL 884 : java_lang_Class::as_Klass(from_class_oop); 885 oop class_loader = NULL; 886 oop protection_domain = NULL; 887 if (from_class != NULL) { 888 class_loader = from_class->class_loader(); 889 protection_domain = from_class->protection_domain(); 890 } 891 Handle h_loader(THREAD, class_loader); 892 Handle h_prot (THREAD, protection_domain); 893 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 894 h_prot, true, thread); 895 896 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 897 // this function is generally only used for class loading during verification. 898 ResourceMark rm; 899 oop from_mirror = JNIHandles::resolve_non_null(from); 900 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 901 const char * from_name = from_class->external_name(); 902 903 oop mirror = JNIHandles::resolve_non_null(result); 904 Klass* to_class = java_lang_Class::as_Klass(mirror); 905 const char * to = to_class->external_name(); 906 log_debug(class, resolve)("%s %s (verification)", from_name, to); 907 } 908 909 return result; 910 JVM_END 911 912 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 913 if (loader.is_null()) { 914 return; 915 } 916 917 // check whether the current caller thread holds the lock or not. 918 // If not, increment the corresponding counter 919 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 920 ObjectSynchronizer::owner_self) { 921 counter->inc(); 922 } 923 } 924 925 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 926 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 927 jobject loader, const jbyte *buf, 928 jsize len, jobject pd, const char *source, 929 TRAPS) { 930 if (source == NULL) source = "__JVM_DefineClass__"; 931 932 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 933 JavaThread* jt = (JavaThread*) THREAD; 934 935 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 936 ClassLoader::perf_define_appclass_selftime(), 937 ClassLoader::perf_define_appclasses(), 938 jt->get_thread_stat()->perf_recursion_counts_addr(), 939 jt->get_thread_stat()->perf_timers_addr(), 940 PerfClassTraceTime::DEFINE_CLASS); 941 942 if (UsePerfData) { 943 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 944 } 945 946 // Since exceptions can be thrown, class initialization can take place 947 // if name is NULL no check for class name in .class stream has to be made. 948 TempNewSymbol class_name = NULL; 949 if (name != NULL) { 950 const int str_len = (int)strlen(name); 951 if (str_len > Symbol::max_length()) { 952 // It's impossible to create this class; the name cannot fit 953 // into the constant pool. 954 Exceptions::fthrow(THREAD_AND_LOCATION, 955 vmSymbols::java_lang_NoClassDefFoundError(), 956 "Class name exceeds maximum length of %d: %s", 957 Symbol::max_length(), 958 name); 959 return 0; 960 } 961 class_name = SymbolTable::new_symbol(name, str_len); 962 } 963 964 ResourceMark rm(THREAD); 965 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 966 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 967 if (UsePerfData) { 968 is_lock_held_by_thread(class_loader, 969 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 970 THREAD); 971 } 972 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 973 Klass* k = SystemDictionary::resolve_from_stream(class_name, 974 class_loader, 975 protection_domain, 976 &st, 977 CHECK_NULL); 978 979 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 980 trace_class_resolution(k); 981 } 982 983 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 984 } 985 986 987 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 988 JVMWrapper("JVM_DefineClass"); 989 990 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 991 JVM_END 992 993 994 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 995 JVMWrapper("JVM_DefineClassWithSource"); 996 997 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 998 JVM_END 999 1000 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1001 JVMWrapper("JVM_FindLoadedClass"); 1002 ResourceMark rm(THREAD); 1003 1004 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1005 char* str = java_lang_String::as_utf8_string(h_name()); 1006 1007 // Sanity check, don't expect null 1008 if (str == NULL) return NULL; 1009 1010 // Internalize the string, converting '.' to '/' in string. 1011 char* p = (char*)str; 1012 while (*p != '\0') { 1013 if (*p == '.') { 1014 *p = '/'; 1015 } 1016 p++; 1017 } 1018 1019 const int str_len = (int)(p - str); 1020 if (str_len > Symbol::max_length()) { 1021 // It's impossible to create this class; the name cannot fit 1022 // into the constant pool. 1023 return NULL; 1024 } 1025 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1026 1027 // Security Note: 1028 // The Java level wrapper will perform the necessary security check allowing 1029 // us to pass the NULL as the initiating class loader. 1030 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1031 if (UsePerfData) { 1032 is_lock_held_by_thread(h_loader, 1033 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1034 THREAD); 1035 } 1036 1037 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1038 h_loader, 1039 Handle(), 1040 CHECK_NULL); 1041 #if INCLUDE_CDS 1042 if (k == NULL) { 1043 // If the class is not already loaded, try to see if it's in the shared 1044 // archive for the current classloader (h_loader). 1045 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1046 } 1047 #endif 1048 return (k == NULL) ? NULL : 1049 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1050 JVM_END 1051 1052 // Module support ////////////////////////////////////////////////////////////////////////////// 1053 1054 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1055 jstring location, const char* const* packages, jsize num_packages)) 1056 JVMWrapper("JVM_DefineModule"); 1057 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1058 JVM_END 1059 1060 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1061 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1062 Modules::set_bootloader_unnamed_module(module, CHECK); 1063 JVM_END 1064 1065 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1066 JVMWrapper("JVM_AddModuleExports"); 1067 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1068 JVM_END 1069 1070 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1071 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1072 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1073 JVM_END 1074 1075 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1076 JVMWrapper("JVM_AddModuleExportsToAll"); 1077 Modules::add_module_exports(from_module, package, NULL, CHECK); 1078 JVM_END 1079 1080 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1081 JVMWrapper("JVM_AddReadsModule"); 1082 Modules::add_reads_module(from_module, source_module, CHECK); 1083 JVM_END 1084 1085 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1086 1087 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1088 assert (cls != NULL, "illegal class"); 1089 JVMWrapper("JVM_InitClassName"); 1090 JvmtiVMObjectAllocEventCollector oam; 1091 ResourceMark rm(THREAD); 1092 HandleMark hm(THREAD); 1093 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1094 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1095 return (jstring) JNIHandles::make_local(env, result); 1096 JVM_END 1097 1098 1099 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1100 JVMWrapper("JVM_GetClassInterfaces"); 1101 JvmtiVMObjectAllocEventCollector oam; 1102 oop mirror = JNIHandles::resolve_non_null(cls); 1103 1104 // Special handling for primitive objects 1105 if (java_lang_Class::is_primitive(mirror)) { 1106 // Primitive objects does not have any interfaces 1107 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1108 return (jobjectArray) JNIHandles::make_local(env, r); 1109 } 1110 1111 Klass* klass = java_lang_Class::as_Klass(mirror); 1112 // Figure size of result array 1113 int size; 1114 if (klass->is_instance_klass()) { 1115 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1116 } else { 1117 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1118 size = 2; 1119 } 1120 1121 // Allocate result array 1122 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1123 objArrayHandle result (THREAD, r); 1124 // Fill in result 1125 if (klass->is_instance_klass()) { 1126 // Regular instance klass, fill in all local interfaces 1127 for (int index = 0; index < size; index++) { 1128 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1129 result->obj_at_put(index, k->java_mirror()); 1130 } 1131 } else { 1132 // All arrays implement java.lang.Cloneable and java.io.Serializable 1133 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1134 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1135 } 1136 return (jobjectArray) JNIHandles::make_local(env, result()); 1137 JVM_END 1138 1139 1140 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1141 JVMWrapper("JVM_IsInterface"); 1142 oop mirror = JNIHandles::resolve_non_null(cls); 1143 if (java_lang_Class::is_primitive(mirror)) { 1144 return JNI_FALSE; 1145 } 1146 Klass* k = java_lang_Class::as_Klass(mirror); 1147 jboolean result = k->is_interface(); 1148 assert(!result || k->is_instance_klass(), 1149 "all interfaces are instance types"); 1150 // The compiler intrinsic for isInterface tests the 1151 // Klass::_access_flags bits in the same way. 1152 return result; 1153 JVM_END 1154 1155 1156 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1157 JVMWrapper("JVM_GetClassSigners"); 1158 JvmtiVMObjectAllocEventCollector oam; 1159 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1160 // There are no signers for primitive types 1161 return NULL; 1162 } 1163 1164 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls))); 1165 1166 // If there are no signers set in the class, or if the class 1167 // is an array, return NULL. 1168 if (signers == NULL) return NULL; 1169 1170 // copy of the signers array 1171 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1172 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1173 for (int index = 0; index < signers->length(); index++) { 1174 signers_copy->obj_at_put(index, signers->obj_at(index)); 1175 } 1176 1177 // return the copy 1178 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1179 JVM_END 1180 1181 1182 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1183 JVMWrapper("JVM_SetClassSigners"); 1184 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1185 // This call is ignored for primitive types and arrays. 1186 // Signers are only set once, ClassLoader.java, and thus shouldn't 1187 // be called with an array. Only the bootstrap loader creates arrays. 1188 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1189 if (k->is_instance_klass()) { 1190 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1191 } 1192 } 1193 JVM_END 1194 1195 1196 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1197 JVMWrapper("JVM_GetProtectionDomain"); 1198 if (JNIHandles::resolve(cls) == NULL) { 1199 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1200 } 1201 1202 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1203 // Primitive types does not have a protection domain. 1204 return NULL; 1205 } 1206 1207 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1208 return (jobject) JNIHandles::make_local(env, pd); 1209 JVM_END 1210 1211 1212 // Returns the inherited_access_control_context field of the running thread. 1213 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1214 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1215 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1216 return JNIHandles::make_local(env, result); 1217 JVM_END 1218 1219 class RegisterArrayForGC { 1220 private: 1221 JavaThread *_thread; 1222 public: 1223 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1224 _thread = thread; 1225 _thread->register_array_for_gc(array); 1226 } 1227 1228 ~RegisterArrayForGC() { 1229 _thread->register_array_for_gc(NULL); 1230 } 1231 }; 1232 1233 1234 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1235 JVMWrapper("JVM_GetStackAccessControlContext"); 1236 if (!UsePrivilegedStack) return NULL; 1237 1238 ResourceMark rm(THREAD); 1239 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1240 JvmtiVMObjectAllocEventCollector oam; 1241 1242 // count the protection domains on the execution stack. We collapse 1243 // duplicate consecutive protection domains into a single one, as 1244 // well as stopping when we hit a privileged frame. 1245 1246 oop previous_protection_domain = NULL; 1247 Handle privileged_context(thread, NULL); 1248 bool is_privileged = false; 1249 oop protection_domain = NULL; 1250 1251 // Iterate through Java frames 1252 vframeStream vfst(thread); 1253 for(; !vfst.at_end(); vfst.next()) { 1254 // get method of frame 1255 Method* method = vfst.method(); 1256 1257 // stop at the first privileged frame 1258 if (method->method_holder() == SystemDictionary::AccessController_klass() && 1259 method->name() == vmSymbols::executePrivileged_name()) 1260 { 1261 // this frame is privileged 1262 is_privileged = true; 1263 1264 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1265 1266 StackValueCollection* locals = priv->locals(); 1267 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1268 StackValue* clr_sv = locals->at(2); // Class<?> caller 1269 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1270 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1271 privileged_context = ctx_sv->get_obj(); 1272 Handle caller = clr_sv->get_obj(); 1273 1274 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1275 protection_domain = caller_klass->protection_domain(); 1276 } else { 1277 protection_domain = method->method_holder()->protection_domain(); 1278 } 1279 1280 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1281 local_array->push(protection_domain); 1282 previous_protection_domain = protection_domain; 1283 } 1284 1285 if (is_privileged) break; 1286 } 1287 1288 1289 // either all the domains on the stack were system domains, or 1290 // we had a privileged system domain 1291 if (local_array->is_empty()) { 1292 if (is_privileged && privileged_context.is_null()) return NULL; 1293 1294 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1295 return JNIHandles::make_local(env, result); 1296 } 1297 1298 // the resource area must be registered in case of a gc 1299 RegisterArrayForGC ragc(thread, local_array); 1300 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1301 local_array->length(), CHECK_NULL); 1302 objArrayHandle h_context(thread, context); 1303 for (int index = 0; index < local_array->length(); index++) { 1304 h_context->obj_at_put(index, local_array->at(index)); 1305 } 1306 1307 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1308 1309 return JNIHandles::make_local(env, result); 1310 JVM_END 1311 1312 1313 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1314 JVMWrapper("JVM_IsArrayClass"); 1315 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1316 return (k != NULL) && k->is_array_klass() ? true : false; 1317 JVM_END 1318 1319 1320 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1321 JVMWrapper("JVM_IsPrimitiveClass"); 1322 oop mirror = JNIHandles::resolve_non_null(cls); 1323 return (jboolean) java_lang_Class::is_primitive(mirror); 1324 JVM_END 1325 1326 1327 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1328 JVMWrapper("JVM_GetClassModifiers"); 1329 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1330 // Primitive type 1331 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1332 } 1333 1334 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1335 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1336 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1337 return k->modifier_flags(); 1338 JVM_END 1339 1340 1341 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1342 1343 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1344 JvmtiVMObjectAllocEventCollector oam; 1345 // ofClass is a reference to a java_lang_Class object. The mirror object 1346 // of an InstanceKlass 1347 1348 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1349 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1350 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1351 return (jobjectArray)JNIHandles::make_local(env, result); 1352 } 1353 1354 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1355 InnerClassesIterator iter(k); 1356 1357 if (iter.length() == 0) { 1358 // Neither an inner nor outer class 1359 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1360 return (jobjectArray)JNIHandles::make_local(env, result); 1361 } 1362 1363 // find inner class info 1364 constantPoolHandle cp(thread, k->constants()); 1365 int length = iter.length(); 1366 1367 // Allocate temp. result array 1368 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1369 objArrayHandle result (THREAD, r); 1370 int members = 0; 1371 1372 for (; !iter.done(); iter.next()) { 1373 int ioff = iter.inner_class_info_index(); 1374 int ooff = iter.outer_class_info_index(); 1375 1376 if (ioff != 0 && ooff != 0) { 1377 // Check to see if the name matches the class we're looking for 1378 // before attempting to find the class. 1379 if (cp->klass_name_at_matches(k, ooff)) { 1380 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1381 if (outer_klass == k) { 1382 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1383 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1384 1385 // Throws an exception if outer klass has not declared k as 1386 // an inner klass 1387 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1388 1389 result->obj_at_put(members, inner_klass->java_mirror()); 1390 members++; 1391 } 1392 } 1393 } 1394 } 1395 1396 if (members != length) { 1397 // Return array of right length 1398 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1399 for(int i = 0; i < members; i++) { 1400 res->obj_at_put(i, result->obj_at(i)); 1401 } 1402 return (jobjectArray)JNIHandles::make_local(env, res); 1403 } 1404 1405 return (jobjectArray)JNIHandles::make_local(env, result()); 1406 JVM_END 1407 1408 1409 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1410 { 1411 // ofClass is a reference to a java_lang_Class object. 1412 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1413 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1414 return NULL; 1415 } 1416 1417 bool inner_is_member = false; 1418 Klass* outer_klass 1419 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1420 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1421 if (outer_klass == NULL) return NULL; // already a top-level class 1422 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1423 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1424 } 1425 JVM_END 1426 1427 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1428 { 1429 oop mirror = JNIHandles::resolve_non_null(cls); 1430 if (java_lang_Class::is_primitive(mirror) || 1431 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1432 return NULL; 1433 } 1434 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1435 int ooff = 0, noff = 0; 1436 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1437 if (noff != 0) { 1438 constantPoolHandle i_cp(thread, k->constants()); 1439 Symbol* name = i_cp->symbol_at(noff); 1440 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1441 return (jstring) JNIHandles::make_local(env, str()); 1442 } 1443 } 1444 return NULL; 1445 } 1446 JVM_END 1447 1448 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1449 assert (cls != NULL, "illegal class"); 1450 JVMWrapper("JVM_GetClassSignature"); 1451 JvmtiVMObjectAllocEventCollector oam; 1452 ResourceMark rm(THREAD); 1453 // Return null for arrays and primatives 1454 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1455 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1456 if (k->is_instance_klass()) { 1457 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1458 if (sym == NULL) return NULL; 1459 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1460 return (jstring) JNIHandles::make_local(env, str()); 1461 } 1462 } 1463 return NULL; 1464 JVM_END 1465 1466 1467 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1468 assert (cls != NULL, "illegal class"); 1469 JVMWrapper("JVM_GetClassAnnotations"); 1470 1471 // Return null for arrays and primitives 1472 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1473 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1474 if (k->is_instance_klass()) { 1475 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1476 return (jbyteArray) JNIHandles::make_local(env, a); 1477 } 1478 } 1479 return NULL; 1480 JVM_END 1481 1482 1483 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1484 // some of this code was adapted from from jni_FromReflectedField 1485 1486 oop reflected = JNIHandles::resolve_non_null(field); 1487 oop mirror = java_lang_reflect_Field::clazz(reflected); 1488 Klass* k = java_lang_Class::as_Klass(mirror); 1489 int slot = java_lang_reflect_Field::slot(reflected); 1490 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1491 1492 InstanceKlass* ik = InstanceKlass::cast(k); 1493 intptr_t offset = ik->field_offset(slot); 1494 1495 if (modifiers & JVM_ACC_STATIC) { 1496 // for static fields we only look in the current class 1497 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1498 assert(false, "cannot find static field"); 1499 return false; 1500 } 1501 } else { 1502 // for instance fields we start with the current class and work 1503 // our way up through the superclass chain 1504 if (!ik->find_field_from_offset(offset, false, &fd)) { 1505 assert(false, "cannot find instance field"); 1506 return false; 1507 } 1508 } 1509 return true; 1510 } 1511 1512 static Method* jvm_get_method_common(jobject method) { 1513 // some of this code was adapted from from jni_FromReflectedMethod 1514 1515 oop reflected = JNIHandles::resolve_non_null(method); 1516 oop mirror = NULL; 1517 int slot = 0; 1518 1519 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1520 mirror = java_lang_reflect_Constructor::clazz(reflected); 1521 slot = java_lang_reflect_Constructor::slot(reflected); 1522 } else { 1523 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1524 "wrong type"); 1525 mirror = java_lang_reflect_Method::clazz(reflected); 1526 slot = java_lang_reflect_Method::slot(reflected); 1527 } 1528 Klass* k = java_lang_Class::as_Klass(mirror); 1529 1530 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1531 assert(m != NULL, "cannot find method"); 1532 return m; // caller has to deal with NULL in product mode 1533 } 1534 1535 /* Type use annotations support (JDK 1.8) */ 1536 1537 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1538 assert (cls != NULL, "illegal class"); 1539 JVMWrapper("JVM_GetClassTypeAnnotations"); 1540 ResourceMark rm(THREAD); 1541 // Return null for arrays and primitives 1542 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1544 if (k->is_instance_klass()) { 1545 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1546 if (type_annotations != NULL) { 1547 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1548 return (jbyteArray) JNIHandles::make_local(env, a); 1549 } 1550 } 1551 } 1552 return NULL; 1553 JVM_END 1554 1555 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1556 assert (method != NULL, "illegal method"); 1557 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1558 1559 // method is a handle to a java.lang.reflect.Method object 1560 Method* m = jvm_get_method_common(method); 1561 if (m == NULL) { 1562 return NULL; 1563 } 1564 1565 AnnotationArray* type_annotations = m->type_annotations(); 1566 if (type_annotations != NULL) { 1567 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1568 return (jbyteArray) JNIHandles::make_local(env, a); 1569 } 1570 1571 return NULL; 1572 JVM_END 1573 1574 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1575 assert (field != NULL, "illegal field"); 1576 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1577 1578 fieldDescriptor fd; 1579 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1580 if (!gotFd) { 1581 return NULL; 1582 } 1583 1584 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1585 JVM_END 1586 1587 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1588 if (!cp->is_within_bounds(index)) { 1589 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1590 } 1591 } 1592 1593 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1594 { 1595 JVMWrapper("JVM_GetMethodParameters"); 1596 // method is a handle to a java.lang.reflect.Method object 1597 Method* method_ptr = jvm_get_method_common(method); 1598 methodHandle mh (THREAD, method_ptr); 1599 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1600 const int num_params = mh->method_parameters_length(); 1601 1602 if (num_params < 0) { 1603 // A -1 return value from method_parameters_length means there is no 1604 // parameter data. Return null to indicate this to the reflection 1605 // API. 1606 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1607 return (jobjectArray)NULL; 1608 } else { 1609 // Otherwise, we return something up to reflection, even if it is 1610 // a zero-length array. Why? Because in some cases this can 1611 // trigger a MalformedParametersException. 1612 1613 // make sure all the symbols are properly formatted 1614 for (int i = 0; i < num_params; i++) { 1615 MethodParametersElement* params = mh->method_parameters_start(); 1616 int index = params[i].name_cp_index; 1617 constantPoolHandle cp(THREAD, mh->constants()); 1618 bounds_check(cp, 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 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3044 JVMWrapper("JVM_Interrupt"); 3045 3046 ThreadsListHandle tlh(thread); 3047 JavaThread* receiver = NULL; 3048 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3049 if (is_alive) { 3050 // jthread refers to a live JavaThread. 3051 receiver->interrupt(); 3052 } 3053 JVM_END 3054 3055 3056 // Return true iff the current thread has locked the object passed in 3057 3058 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3059 JVMWrapper("JVM_HoldsLock"); 3060 assert(THREAD->is_Java_thread(), "sanity check"); 3061 if (obj == NULL) { 3062 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3063 } 3064 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3065 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3066 JVM_END 3067 3068 3069 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3070 JVMWrapper("JVM_DumpAllStacks"); 3071 VM_PrintThreads op; 3072 VMThread::execute(&op); 3073 if (JvmtiExport::should_post_data_dump()) { 3074 JvmtiExport::post_data_dump(); 3075 } 3076 JVM_END 3077 3078 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3079 JVMWrapper("JVM_SetNativeThreadName"); 3080 3081 // We don't use a ThreadsListHandle here because the current thread 3082 // must be alive. 3083 oop java_thread = JNIHandles::resolve_non_null(jthread); 3084 JavaThread* thr = java_lang_Thread::thread(java_thread); 3085 if (thread == thr && !thr->has_attached_via_jni()) { 3086 // Thread naming is only supported for the current thread and 3087 // we don't set the name of an attached thread to avoid stepping 3088 // on other programs. 3089 ResourceMark rm(thread); 3090 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3091 os::set_native_thread_name(thread_name); 3092 } 3093 JVM_END 3094 3095 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3096 3097 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3098 JVMWrapper("JVM_GetClassContext"); 3099 ResourceMark rm(THREAD); 3100 JvmtiVMObjectAllocEventCollector oam; 3101 vframeStream vfst(thread); 3102 3103 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3104 // This must only be called from SecurityManager.getClassContext 3105 Method* m = vfst.method(); 3106 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3107 m->name() == vmSymbols::getClassContext_name() && 3108 m->signature() == vmSymbols::void_class_array_signature())) { 3109 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3110 } 3111 } 3112 3113 // Collect method holders 3114 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3115 for (; !vfst.at_end(); vfst.security_next()) { 3116 Method* m = vfst.method(); 3117 // Native frames are not returned 3118 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3119 Klass* holder = m->method_holder(); 3120 assert(holder->is_klass(), "just checking"); 3121 klass_array->append(holder); 3122 } 3123 } 3124 3125 // Create result array of type [Ljava/lang/Class; 3126 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3127 // Fill in mirrors corresponding to method holders 3128 for (int i = 0; i < klass_array->length(); i++) { 3129 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3130 } 3131 3132 return (jobjectArray) JNIHandles::make_local(env, result); 3133 JVM_END 3134 3135 3136 // java.lang.Package //////////////////////////////////////////////////////////////// 3137 3138 3139 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3140 JVMWrapper("JVM_GetSystemPackage"); 3141 ResourceMark rm(THREAD); 3142 JvmtiVMObjectAllocEventCollector oam; 3143 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3144 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3145 return (jstring) JNIHandles::make_local(result); 3146 JVM_END 3147 3148 3149 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3150 JVMWrapper("JVM_GetSystemPackages"); 3151 JvmtiVMObjectAllocEventCollector oam; 3152 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3153 return (jobjectArray) JNIHandles::make_local(result); 3154 JVM_END 3155 3156 3157 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3158 3159 3160 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3161 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3162 3163 MonitorLocker ml(Heap_lock); 3164 oop ref = Universe::reference_pending_list(); 3165 if (ref != NULL) { 3166 Universe::set_reference_pending_list(NULL); 3167 } 3168 return JNIHandles::make_local(env, ref); 3169 JVM_END 3170 3171 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3172 JVMWrapper("JVM_HasReferencePendingList"); 3173 MonitorLocker ml(Heap_lock); 3174 return Universe::has_reference_pending_list(); 3175 JVM_END 3176 3177 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3178 JVMWrapper("JVM_WaitForReferencePendingList"); 3179 MonitorLocker ml(Heap_lock); 3180 while (!Universe::has_reference_pending_list()) { 3181 ml.wait(); 3182 } 3183 JVM_END 3184 3185 3186 // ObjectInputStream /////////////////////////////////////////////////////////////// 3187 3188 // Return the first user-defined class loader up the execution stack, or null 3189 // if only code from the bootstrap or platform class loader is on the stack. 3190 3191 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3192 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3193 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3194 oop loader = vfst.method()->method_holder()->class_loader(); 3195 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3196 return JNIHandles::make_local(env, loader); 3197 } 3198 } 3199 return NULL; 3200 JVM_END 3201 3202 3203 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3204 3205 3206 // resolve array handle and check arguments 3207 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3208 if (arr == NULL) { 3209 THROW_0(vmSymbols::java_lang_NullPointerException()); 3210 } 3211 oop a = JNIHandles::resolve_non_null(arr); 3212 if (!a->is_array()) { 3213 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3214 } else if (type_array_only && !a->is_typeArray()) { 3215 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3216 } 3217 return arrayOop(a); 3218 } 3219 3220 3221 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3222 JVMWrapper("JVM_GetArrayLength"); 3223 arrayOop a = check_array(env, arr, false, CHECK_0); 3224 return a->length(); 3225 JVM_END 3226 3227 3228 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3229 JVMWrapper("JVM_Array_Get"); 3230 JvmtiVMObjectAllocEventCollector oam; 3231 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3232 jvalue value; 3233 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3234 oop box = Reflection::box(&value, type, CHECK_NULL); 3235 return JNIHandles::make_local(env, box); 3236 JVM_END 3237 3238 3239 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3240 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3241 jvalue value; 3242 value.i = 0; // to initialize value before getting used in CHECK 3243 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3244 assert(a->is_typeArray(), "just checking"); 3245 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3246 BasicType wide_type = (BasicType) wCode; 3247 if (type != wide_type) { 3248 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3249 } 3250 return value; 3251 JVM_END 3252 3253 3254 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3255 JVMWrapper("JVM_SetArrayElement"); 3256 arrayOop a = check_array(env, arr, false, CHECK); 3257 oop box = JNIHandles::resolve(val); 3258 jvalue value; 3259 value.i = 0; // to initialize value before getting used in CHECK 3260 BasicType value_type; 3261 if (a->is_objArray()) { 3262 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3263 value_type = Reflection::unbox_for_regular_object(box, &value); 3264 } else { 3265 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3266 } 3267 Reflection::array_set(&value, a, index, value_type, CHECK); 3268 JVM_END 3269 3270 3271 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3272 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3273 arrayOop a = check_array(env, arr, true, CHECK); 3274 assert(a->is_typeArray(), "just checking"); 3275 BasicType value_type = (BasicType) vCode; 3276 Reflection::array_set(&v, a, index, value_type, CHECK); 3277 JVM_END 3278 3279 3280 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3281 JVMWrapper("JVM_NewArray"); 3282 JvmtiVMObjectAllocEventCollector oam; 3283 oop element_mirror = JNIHandles::resolve(eltClass); 3284 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3285 return JNIHandles::make_local(env, result); 3286 JVM_END 3287 3288 3289 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3290 JVMWrapper("JVM_NewMultiArray"); 3291 JvmtiVMObjectAllocEventCollector oam; 3292 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3293 oop element_mirror = JNIHandles::resolve(eltClass); 3294 assert(dim_array->is_typeArray(), "just checking"); 3295 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3296 return JNIHandles::make_local(env, result); 3297 JVM_END 3298 3299 3300 // Library support /////////////////////////////////////////////////////////////////////////// 3301 3302 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3303 //%note jvm_ct 3304 JVMWrapper("JVM_LoadLibrary"); 3305 char ebuf[1024]; 3306 void *load_result; 3307 { 3308 ThreadToNativeFromVM ttnfvm(thread); 3309 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3310 } 3311 if (load_result == NULL) { 3312 char msg[1024]; 3313 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3314 // Since 'ebuf' may contain a string encoded using 3315 // platform encoding scheme, we need to pass 3316 // Exceptions::unsafe_to_utf8 to the new_exception method 3317 // as the last argument. See bug 6367357. 3318 Handle h_exception = 3319 Exceptions::new_exception(thread, 3320 vmSymbols::java_lang_UnsatisfiedLinkError(), 3321 msg, Exceptions::unsafe_to_utf8); 3322 3323 THROW_HANDLE_0(h_exception); 3324 } 3325 return load_result; 3326 JVM_END 3327 3328 3329 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3330 JVMWrapper("JVM_UnloadLibrary"); 3331 os::dll_unload(handle); 3332 JVM_END 3333 3334 3335 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3336 JVMWrapper("JVM_FindLibraryEntry"); 3337 return os::dll_lookup(handle, name); 3338 JVM_END 3339 3340 3341 // JNI version /////////////////////////////////////////////////////////////////////////////// 3342 3343 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3344 JVMWrapper("JVM_IsSupportedJNIVersion"); 3345 return Threads::is_supported_jni_version_including_1_1(version); 3346 JVM_END 3347 3348 3349 // String support /////////////////////////////////////////////////////////////////////////// 3350 3351 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3352 JVMWrapper("JVM_InternString"); 3353 JvmtiVMObjectAllocEventCollector oam; 3354 if (str == NULL) return NULL; 3355 oop string = JNIHandles::resolve_non_null(str); 3356 oop result = StringTable::intern(string, CHECK_NULL); 3357 return (jstring) JNIHandles::make_local(env, result); 3358 JVM_END 3359 3360 3361 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3362 3363 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3364 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3365 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3366 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3367 // nature. JavaThreads will be "in native" when using this API from JDK code. 3368 3369 3370 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3371 VM_Exit::block_if_vm_exited(); 3372 JVMWrapper("JVM_RawMonitorCreate"); 3373 return new os::PlatformMutex(); 3374 } 3375 3376 3377 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3378 VM_Exit::block_if_vm_exited(); 3379 JVMWrapper("JVM_RawMonitorDestroy"); 3380 delete ((os::PlatformMutex*) mon); 3381 } 3382 3383 3384 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3385 VM_Exit::block_if_vm_exited(); 3386 JVMWrapper("JVM_RawMonitorEnter"); 3387 ((os::PlatformMutex*) mon)->lock(); 3388 return 0; 3389 } 3390 3391 3392 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3393 VM_Exit::block_if_vm_exited(); 3394 JVMWrapper("JVM_RawMonitorExit"); 3395 ((os::PlatformMutex*) mon)->unlock(); 3396 } 3397 3398 3399 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3400 3401 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3402 Handle loader, Handle protection_domain, 3403 jboolean throwError, TRAPS) { 3404 // Security Note: 3405 // The Java level wrapper will perform the necessary security check allowing 3406 // us to pass the NULL as the initiating class loader. The VM is responsible for 3407 // the checkPackageAccess relative to the initiating class loader via the 3408 // protection_domain. The protection_domain is passed as NULL by the java code 3409 // if there is no security manager in 3-arg Class.forName(). 3410 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3411 3412 // Check if we should initialize the class 3413 if (init && klass->is_instance_klass()) { 3414 klass->initialize(CHECK_NULL); 3415 } 3416 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3417 } 3418 3419 3420 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3421 3422 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3423 JVMWrapper("JVM_InvokeMethod"); 3424 Handle method_handle; 3425 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3426 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3427 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3428 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3429 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3430 jobject res = JNIHandles::make_local(env, result); 3431 if (JvmtiExport::should_post_vm_object_alloc()) { 3432 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3433 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3434 if (java_lang_Class::is_primitive(ret_type)) { 3435 // Only for primitive type vm allocates memory for java object. 3436 // See box() method. 3437 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3438 } 3439 } 3440 return res; 3441 } else { 3442 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3443 } 3444 JVM_END 3445 3446 3447 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3448 JVMWrapper("JVM_NewInstanceFromConstructor"); 3449 oop constructor_mirror = JNIHandles::resolve(c); 3450 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3451 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3452 jobject res = JNIHandles::make_local(env, result); 3453 if (JvmtiExport::should_post_vm_object_alloc()) { 3454 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3455 } 3456 return res; 3457 JVM_END 3458 3459 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3460 3461 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3462 JVMWrapper("JVM_SupportsCX8"); 3463 return VM_Version::supports_cx8(); 3464 JVM_END 3465 3466 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3467 JVMWrapper("JVM_InitializeFromArchive"); 3468 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3469 assert(k->is_klass(), "just checking"); 3470 HeapShared::initialize_from_archived_subgraph(k); 3471 JVM_END 3472 3473 // Returns an array of all live Thread objects (VM internal JavaThreads, 3474 // jvmti agent threads, and JNI attaching threads are skipped) 3475 // See CR 6404306 regarding JNI attaching threads 3476 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3477 ResourceMark rm(THREAD); 3478 ThreadsListEnumerator tle(THREAD, false, false); 3479 JvmtiVMObjectAllocEventCollector oam; 3480 3481 int num_threads = tle.num_threads(); 3482 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3483 objArrayHandle threads_ah(THREAD, r); 3484 3485 for (int i = 0; i < num_threads; i++) { 3486 Handle h = tle.get_threadObj(i); 3487 threads_ah->obj_at_put(i, h()); 3488 } 3489 3490 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3491 JVM_END 3492 3493 3494 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3495 // Return StackTraceElement[][], each element is the stack trace of a thread in 3496 // the corresponding entry in the given threads array 3497 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3498 JVMWrapper("JVM_DumpThreads"); 3499 JvmtiVMObjectAllocEventCollector oam; 3500 3501 // Check if threads is null 3502 if (threads == NULL) { 3503 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3504 } 3505 3506 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3507 objArrayHandle ah(THREAD, a); 3508 int num_threads = ah->length(); 3509 // check if threads is non-empty array 3510 if (num_threads == 0) { 3511 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3512 } 3513 3514 // check if threads is not an array of objects of Thread class 3515 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3516 if (k != SystemDictionary::Thread_klass()) { 3517 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3518 } 3519 3520 ResourceMark rm(THREAD); 3521 3522 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3523 for (int i = 0; i < num_threads; i++) { 3524 oop thread_obj = ah->obj_at(i); 3525 instanceHandle h(THREAD, (instanceOop) thread_obj); 3526 thread_handle_array->append(h); 3527 } 3528 3529 // The JavaThread references in thread_handle_array are validated 3530 // in VM_ThreadDump::doit(). 3531 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3532 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3533 3534 JVM_END 3535 3536 // JVM monitoring and management support 3537 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3538 return Management::get_jmm_interface(version); 3539 JVM_END 3540 3541 // com.sun.tools.attach.VirtualMachine agent properties support 3542 // 3543 // Initialize the agent properties with the properties maintained in the VM 3544 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3545 JVMWrapper("JVM_InitAgentProperties"); 3546 ResourceMark rm; 3547 3548 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3549 3550 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3551 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3552 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3553 return properties; 3554 JVM_END 3555 3556 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3557 { 3558 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3559 JvmtiVMObjectAllocEventCollector oam; 3560 3561 if (ofClass == NULL) { 3562 return NULL; 3563 } 3564 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3565 // Special handling for primitive objects 3566 if (java_lang_Class::is_primitive(mirror())) { 3567 return NULL; 3568 } 3569 Klass* k = java_lang_Class::as_Klass(mirror()); 3570 if (!k->is_instance_klass()) { 3571 return NULL; 3572 } 3573 InstanceKlass* ik = InstanceKlass::cast(k); 3574 int encl_method_class_idx = ik->enclosing_method_class_index(); 3575 if (encl_method_class_idx == 0) { 3576 return NULL; 3577 } 3578 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3579 objArrayHandle dest(THREAD, dest_o); 3580 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3581 dest->obj_at_put(0, enc_k->java_mirror()); 3582 int encl_method_method_idx = ik->enclosing_method_method_index(); 3583 if (encl_method_method_idx != 0) { 3584 Symbol* sym = ik->constants()->symbol_at( 3585 extract_low_short_from_int( 3586 ik->constants()->name_and_type_at(encl_method_method_idx))); 3587 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3588 dest->obj_at_put(1, str()); 3589 sym = ik->constants()->symbol_at( 3590 extract_high_short_from_int( 3591 ik->constants()->name_and_type_at(encl_method_method_idx))); 3592 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3593 dest->obj_at_put(2, str()); 3594 } 3595 return (jobjectArray) JNIHandles::make_local(dest()); 3596 } 3597 JVM_END 3598 3599 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3600 { 3601 memset(info, 0, info_size); 3602 3603 info->jvm_version = VM_Version::jvm_version(); 3604 info->patch_version = VM_Version::vm_patch_version(); 3605 3606 // when we add a new capability in the jvm_version_info struct, we should also 3607 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3608 // counter defined in runtimeService.cpp. 3609 info->is_attach_supported = AttachListener::is_attach_supported(); 3610 } 3611 JVM_END 3612 3613 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3614 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3615 ResourceMark rm(THREAD); 3616 3617 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3618 return NULL; 3619 } 3620 3621 char** vm_flags = Arguments::jvm_flags_array(); 3622 char** vm_args = Arguments::jvm_args_array(); 3623 int num_flags = Arguments::num_jvm_flags(); 3624 int num_args = Arguments::num_jvm_args(); 3625 3626 InstanceKlass* ik = SystemDictionary::String_klass(); 3627 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3628 objArrayHandle result_h(THREAD, r); 3629 3630 int index = 0; 3631 for (int j = 0; j < num_flags; j++, index++) { 3632 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3633 result_h->obj_at_put(index, h()); 3634 } 3635 for (int i = 0; i < num_args; i++, index++) { 3636 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3637 result_h->obj_at_put(index, h()); 3638 } 3639 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3640 JVM_END 3641 3642 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3643 return os::get_signal_number(name); 3644 JVM_END