1 /* 2 * Copyright (c) 1997, 2018, 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/systemDictionary.hpp" 37 #include "classfile/vmSymbols.hpp" 38 #include "gc/shared/collectedHeap.inline.hpp" 39 #include "interpreter/bytecode.hpp" 40 #include "jfr/jfrEvents.hpp" 41 #include "logging/log.hpp" 42 #include "memory/heapShared.hpp" 43 #include "memory/oopFactory.hpp" 44 #include "memory/referenceType.hpp" 45 #include "memory/resourceArea.hpp" 46 #include "memory/universe.hpp" 47 #include "oops/access.inline.hpp" 48 #include "oops/fieldStreams.hpp" 49 #include "oops/instanceKlass.hpp" 50 #include "oops/method.hpp" 51 #include "oops/objArrayKlass.hpp" 52 #include "oops/objArrayOop.inline.hpp" 53 #include "oops/oop.inline.hpp" 54 #include "prims/jvm_misc.hpp" 55 #include "prims/jvmtiExport.hpp" 56 #include "prims/jvmtiThreadState.hpp" 57 #include "prims/nativeLookup.hpp" 58 #include "prims/stackwalk.hpp" 59 #include "runtime/arguments.hpp" 60 #include "runtime/atomic.hpp" 61 #include "runtime/handles.inline.hpp" 62 #include "runtime/init.hpp" 63 #include "runtime/interfaceSupport.inline.hpp" 64 #include "runtime/java.hpp" 65 #include "runtime/javaCalls.hpp" 66 #include "runtime/jfieldIDWorkaround.hpp" 67 #include "runtime/jniHandles.inline.hpp" 68 #include "runtime/orderAccess.hpp" 69 #include "runtime/os.inline.hpp" 70 #include "runtime/perfData.hpp" 71 #include "runtime/reflection.hpp" 72 #include "runtime/thread.inline.hpp" 73 #include "runtime/threadSMR.hpp" 74 #include "runtime/vframe.inline.hpp" 75 #include "runtime/vm_operations.hpp" 76 #include "runtime/vm_version.hpp" 77 #include "services/attachListener.hpp" 78 #include "services/management.hpp" 79 #include "services/threadService.hpp" 80 #include "utilities/copy.hpp" 81 #include "utilities/defaultStream.hpp" 82 #include "utilities/dtrace.hpp" 83 #include "utilities/events.hpp" 84 #include "utilities/histogram.hpp" 85 #include "utilities/macros.hpp" 86 #include "utilities/utf8.hpp" 87 #if INCLUDE_CDS 88 #include "classfile/systemDictionaryShared.hpp" 89 #endif 90 91 #include <errno.h> 92 93 /* 94 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 95 such ctors and calls MUST NOT come between an oop declaration/init and its 96 usage because if objects are move this may cause various memory stomps, bus 97 errors and segfaults. Here is a cookbook for causing so called "naked oop 98 failures": 99 100 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 101 JVMWrapper("JVM_GetClassDeclaredFields"); 102 103 // Object address to be held directly in mirror & not visible to GC 104 oop mirror = JNIHandles::resolve_non_null(ofClass); 105 106 // If this ctor can hit a safepoint, moving objects around, then 107 ComplexConstructor foo; 108 109 // Boom! mirror may point to JUNK instead of the intended object 110 (some dereference of mirror) 111 112 // Here's another call that may block for GC, making mirror stale 113 MutexLocker ml(some_lock); 114 115 // And here's an initializer that can result in a stale oop 116 // all in one step. 117 oop o = call_that_can_throw_exception(TRAPS); 118 119 120 The solution is to keep the oop declaration BELOW the ctor or function 121 call that might cause a GC, do another resolve to reassign the oop, or 122 consider use of a Handle instead of an oop so there is immunity from object 123 motion. But note that the "QUICK" entries below do not have a handlemark 124 and thus can only support use of handles passed in. 125 */ 126 127 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 128 ResourceMark rm; 129 int line_number = -1; 130 const char * source_file = NULL; 131 const char * trace = "explicit"; 132 InstanceKlass* caller = NULL; 133 JavaThread* jthread = JavaThread::current(); 134 if (jthread->has_last_Java_frame()) { 135 vframeStream vfst(jthread); 136 137 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 138 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 139 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 140 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 141 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 142 143 Method* last_caller = NULL; 144 145 while (!vfst.at_end()) { 146 Method* m = vfst.method(); 147 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 148 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 149 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 150 break; 151 } 152 last_caller = m; 153 vfst.next(); 154 } 155 // if this is called from Class.forName0 and that is called from Class.forName, 156 // then print the caller of Class.forName. If this is Class.loadClass, then print 157 // that caller, otherwise keep quiet since this should be picked up elsewhere. 158 bool found_it = false; 159 if (!vfst.at_end() && 160 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 161 vfst.method()->name() == vmSymbols::forName0_name()) { 162 vfst.next(); 163 if (!vfst.at_end() && 164 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 165 vfst.method()->name() == vmSymbols::forName_name()) { 166 vfst.next(); 167 found_it = true; 168 } 169 } else if (last_caller != NULL && 170 last_caller->method_holder()->name() == 171 vmSymbols::java_lang_ClassLoader() && 172 last_caller->name() == vmSymbols::loadClass_name()) { 173 found_it = true; 174 } else if (!vfst.at_end()) { 175 if (vfst.method()->is_native()) { 176 // JNI call 177 found_it = true; 178 } 179 } 180 if (found_it && !vfst.at_end()) { 181 // found the caller 182 caller = vfst.method()->method_holder(); 183 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 184 if (line_number == -1) { 185 // show method name if it's a native method 186 trace = vfst.method()->name_and_sig_as_C_string(); 187 } 188 Symbol* s = caller->source_file_name(); 189 if (s != NULL) { 190 source_file = s->as_C_string(); 191 } 192 } 193 } 194 if (caller != NULL) { 195 if (to_class != caller) { 196 const char * from = caller->external_name(); 197 const char * to = to_class->external_name(); 198 // print in a single call to reduce interleaving between threads 199 if (source_file != NULL) { 200 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 201 } else { 202 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 203 } 204 } 205 } 206 } 207 208 void trace_class_resolution(Klass* to_class) { 209 EXCEPTION_MARK; 210 trace_class_resolution_impl(to_class, THREAD); 211 if (HAS_PENDING_EXCEPTION) { 212 CLEAR_PENDING_EXCEPTION; 213 } 214 } 215 216 // Wrapper to trace JVM functions 217 218 #ifdef ASSERT 219 Histogram* JVMHistogram; 220 volatile int JVMHistogram_lock = 0; 221 222 class JVMHistogramElement : public HistogramElement { 223 public: 224 JVMHistogramElement(const char* name); 225 }; 226 227 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 228 _name = elementName; 229 uintx count = 0; 230 231 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 232 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 233 count +=1; 234 if ( (WarnOnStalledSpinLock > 0) 235 && (count % WarnOnStalledSpinLock == 0)) { 236 warning("JVMHistogram_lock seems to be stalled"); 237 } 238 } 239 } 240 241 if(JVMHistogram == NULL) 242 JVMHistogram = new Histogram("JVM Call Counts",100); 243 244 JVMHistogram->add_element(this); 245 Atomic::dec(&JVMHistogram_lock); 246 } 247 248 #define JVMCountWrapper(arg) \ 249 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 250 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 251 252 #define JVMWrapper(arg) JVMCountWrapper(arg); 253 #else 254 #define JVMWrapper(arg) 255 #endif 256 257 258 // Interface version ///////////////////////////////////////////////////////////////////// 259 260 261 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 262 return JVM_INTERFACE_VERSION; 263 JVM_END 264 265 266 // java.lang.System ////////////////////////////////////////////////////////////////////// 267 268 269 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 270 JVMWrapper("JVM_CurrentTimeMillis"); 271 return os::javaTimeMillis(); 272 JVM_END 273 274 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 275 JVMWrapper("JVM_NanoTime"); 276 return os::javaTimeNanos(); 277 JVM_END 278 279 // The function below is actually exposed by jdk.internal.misc.VM and not 280 // java.lang.System, but we choose to keep it here so that it stays next 281 // to JVM_CurrentTimeMillis and JVM_NanoTime 282 283 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 284 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 285 286 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 287 JVMWrapper("JVM_GetNanoTimeAdjustment"); 288 jlong seconds; 289 jlong nanos; 290 291 os::javaTimeSystemUTC(seconds, nanos); 292 293 // We're going to verify that the result can fit in a long. 294 // For that we need the difference in seconds between 'seconds' 295 // and 'offset_secs' to be such that: 296 // |seconds - offset_secs| < (2^63/10^9) 297 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 298 // which makes |seconds - offset_secs| < 2^33 299 // and we will prefer +/- 2^32 as the maximum acceptable diff 300 // as 2^32 has a more natural feel than 2^33... 301 // 302 // So if |seconds - offset_secs| >= 2^32 - we return a special 303 // sentinel value (-1) which the caller should take as an 304 // exception value indicating that the offset given to us is 305 // too far from range of the current time - leading to too big 306 // a nano adjustment. The caller is expected to recover by 307 // computing a more accurate offset and calling this method 308 // again. (For the record 2^32 secs is ~136 years, so that 309 // should rarely happen) 310 // 311 jlong diff = seconds - offset_secs; 312 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 313 return -1; // sentinel value: the offset is too far off the target 314 } 315 316 // return the adjustment. If you compute a time by adding 317 // this number of nanoseconds along with the number of seconds 318 // in the offset you should get the current UTC time. 319 return (diff * (jlong)1000000000) + nanos; 320 JVM_END 321 322 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 323 jobject dst, jint dst_pos, jint length)) 324 JVMWrapper("JVM_ArrayCopy"); 325 // Check if we have null pointers 326 if (src == NULL || dst == NULL) { 327 THROW(vmSymbols::java_lang_NullPointerException()); 328 } 329 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 330 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 331 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 332 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 333 // Do copy 334 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 335 JVM_END 336 337 338 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 339 JavaValue r(T_OBJECT); 340 // public synchronized Object put(Object key, Object value); 341 HandleMark hm(THREAD); 342 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 343 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 344 JavaCalls::call_virtual(&r, 345 props, 346 SystemDictionary::Properties_klass(), 347 vmSymbols::put_name(), 348 vmSymbols::object_object_object_signature(), 349 key_str, 350 value_str, 351 THREAD); 352 } 353 354 355 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 356 357 /* 358 * Return all of the system properties in a Java String array with alternating 359 * names and values from the jvm SystemProperty. 360 * Which includes some internal and all commandline -D defined properties. 361 */ 362 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 363 JVMWrapper("JVM_GetProperties"); 364 ResourceMark rm(THREAD); 365 HandleMark hm(THREAD); 366 int ndx = 0; 367 int fixedCount = 2; 368 369 SystemProperty* p = Arguments::system_properties(); 370 int count = Arguments::PropertyList_count(p); 371 372 // Allocate result String array 373 InstanceKlass* ik = SystemDictionary::String_klass(); 374 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 375 objArrayHandle result_h(THREAD, r); 376 377 while (p != NULL) { 378 const char * key = p->key(); 379 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 380 const char * value = p->value(); 381 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 382 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL); 383 result_h->obj_at_put(ndx * 2, key_str()); 384 result_h->obj_at_put(ndx * 2 + 1, value_str()); 385 ndx++; 386 } 387 p = p->next(); 388 } 389 390 // Convert the -XX:MaxDirectMemorySize= command line flag 391 // to the sun.nio.MaxDirectMemorySize property. 392 // Do this after setting user properties to prevent people 393 // from setting the value with a -D option, as requested. 394 // Leave empty if not supplied 395 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 396 char as_chars[256]; 397 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 398 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 399 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 400 result_h->obj_at_put(ndx * 2, key_str()); 401 result_h->obj_at_put(ndx * 2 + 1, value_str()); 402 ndx++; 403 } 404 405 // JVM monitoring and management support 406 // Add the sun.management.compiler property for the compiler's name 407 { 408 #undef CSIZE 409 #if defined(_LP64) || defined(_WIN64) 410 #define CSIZE "64-Bit " 411 #else 412 #define CSIZE 413 #endif // 64bit 414 415 #ifdef TIERED 416 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 417 #else 418 #if defined(COMPILER1) 419 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 420 #elif defined(COMPILER2) 421 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 422 #elif INCLUDE_JVMCI 423 #error "INCLUDE_JVMCI should imply TIERED" 424 #else 425 const char* compiler_name = ""; 426 #endif // compilers 427 #endif // TIERED 428 429 if (*compiler_name != '\0' && 430 (Arguments::mode() != Arguments::_int)) { 431 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 432 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 433 result_h->obj_at_put(ndx * 2, key_str()); 434 result_h->obj_at_put(ndx * 2 + 1, value_str()); 435 ndx++; 436 } 437 } 438 439 return (jobjectArray) JNIHandles::make_local(env, result_h()); 440 JVM_END 441 442 443 /* 444 * Return the temporary directory that the VM uses for the attach 445 * and perf data files. 446 * 447 * It is important that this directory is well-known and the 448 * same for all VM instances. It cannot be affected by configuration 449 * variables such as java.io.tmpdir. 450 */ 451 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 452 JVMWrapper("JVM_GetTemporaryDirectory"); 453 HandleMark hm(THREAD); 454 const char* temp_dir = os::get_temp_directory(); 455 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 456 return (jstring) JNIHandles::make_local(env, h()); 457 JVM_END 458 459 460 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 461 462 extern volatile jint vm_created; 463 464 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 465 JVMWrapper("JVM_BeforeHalt"); 466 EventShutdown event; 467 if (event.should_commit()) { 468 event.set_reason("Shutdown requested from Java"); 469 event.commit(); 470 } 471 JVM_END 472 473 474 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 475 before_exit(thread); 476 vm_exit(code); 477 JVM_END 478 479 480 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 481 JVMWrapper("JVM_GC"); 482 if (!DisableExplicitGC) { 483 Universe::heap()->collect(GCCause::_java_lang_system_gc); 484 } 485 JVM_END 486 487 488 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 489 JVMWrapper("JVM_MaxObjectInspectionAge"); 490 return Universe::heap()->millis_since_last_gc(); 491 JVM_END 492 493 494 static inline jlong convert_size_t_to_jlong(size_t val) { 495 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 496 NOT_LP64 (return (jlong)val;) 497 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 498 } 499 500 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 501 JVMWrapper("JVM_TotalMemory"); 502 size_t n = Universe::heap()->capacity(); 503 return convert_size_t_to_jlong(n); 504 JVM_END 505 506 507 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 508 JVMWrapper("JVM_FreeMemory"); 509 CollectedHeap* ch = Universe::heap(); 510 size_t n; 511 { 512 MutexLocker x(Heap_lock); 513 n = ch->capacity() - ch->used(); 514 } 515 return convert_size_t_to_jlong(n); 516 JVM_END 517 518 519 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 520 JVMWrapper("JVM_MaxMemory"); 521 size_t n = Universe::heap()->max_capacity(); 522 return convert_size_t_to_jlong(n); 523 JVM_END 524 525 526 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 527 JVMWrapper("JVM_ActiveProcessorCount"); 528 return os::active_processor_count(); 529 JVM_END 530 531 532 533 // java.lang.Throwable ////////////////////////////////////////////////////// 534 535 536 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 537 JVMWrapper("JVM_FillInStackTrace"); 538 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 539 java_lang_Throwable::fill_in_stack_trace(exception); 540 JVM_END 541 542 543 // java.lang.StackTraceElement ////////////////////////////////////////////// 544 545 546 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 547 JVMWrapper("JVM_InitStackTraceElementArray"); 548 Handle exception(THREAD, JNIHandles::resolve(throwable)); 549 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 550 objArrayHandle stack_trace(THREAD, st); 551 // Fill in the allocated stack trace 552 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 553 JVM_END 554 555 556 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 557 JVMWrapper("JVM_InitStackTraceElement"); 558 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 559 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 560 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 561 JVM_END 562 563 564 // java.lang.StackWalker ////////////////////////////////////////////////////// 565 566 567 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 568 jint skip_frames, jint frame_count, jint start_index, 569 jobjectArray frames)) 570 JVMWrapper("JVM_CallStackWalk"); 571 JavaThread* jt = (JavaThread*) THREAD; 572 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 573 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 574 } 575 576 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 577 578 // frames array is a Class<?>[] array when only getting caller reference, 579 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 580 // be null. 581 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 582 objArrayHandle frames_array_h(THREAD, fa); 583 584 int limit = start_index + frame_count; 585 if (frames_array_h->length() < limit) { 586 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 587 } 588 589 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 590 start_index, frames_array_h, CHECK_NULL); 591 return JNIHandles::make_local(env, result); 592 JVM_END 593 594 595 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 596 jint frame_count, jint start_index, 597 jobjectArray frames)) 598 JVMWrapper("JVM_MoreStackWalk"); 599 JavaThread* jt = (JavaThread*) THREAD; 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_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 610 } 611 612 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 613 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 614 start_index, frames_array_h, THREAD); 615 JVM_END 616 617 // java.lang.Object /////////////////////////////////////////////// 618 619 620 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 621 JVMWrapper("JVM_IHashCode"); 622 // as implemented in the classic virtual machine; return 0 if object is NULL 623 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 624 JVM_END 625 626 627 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 628 JVMWrapper("JVM_MonitorWait"); 629 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 630 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 631 if (JvmtiExport::should_post_monitor_wait()) { 632 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 633 634 // The current thread already owns the monitor and it has not yet 635 // been added to the wait queue so the current thread cannot be 636 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 637 // event handler cannot accidentally consume an unpark() meant for 638 // the ParkEvent associated with this ObjectMonitor. 639 } 640 ObjectSynchronizer::wait(obj, ms, CHECK); 641 JVM_END 642 643 644 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 645 JVMWrapper("JVM_MonitorNotify"); 646 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 647 ObjectSynchronizer::notify(obj, CHECK); 648 JVM_END 649 650 651 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 652 JVMWrapper("JVM_MonitorNotifyAll"); 653 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 654 ObjectSynchronizer::notifyall(obj, CHECK); 655 JVM_END 656 657 658 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 659 JVMWrapper("JVM_Clone"); 660 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 661 Klass* klass = obj->klass(); 662 JvmtiVMObjectAllocEventCollector oam; 663 664 #ifdef ASSERT 665 // Just checking that the cloneable flag is set correct 666 if (obj->is_array()) { 667 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 668 } else { 669 guarantee(obj->is_instance(), "should be instanceOop"); 670 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 671 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 672 } 673 #endif 674 675 // Check if class of obj supports the Cloneable interface. 676 // All arrays are considered to be cloneable (See JLS 20.1.5). 677 // All j.l.r.Reference classes are considered non-cloneable. 678 if (!klass->is_cloneable() || 679 (klass->is_instance_klass() && 680 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 681 ResourceMark rm(THREAD); 682 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 683 } 684 685 // Make shallow object copy 686 const int size = obj->size(); 687 oop new_obj_oop = NULL; 688 if (obj->is_array()) { 689 const int length = ((arrayOop)obj())->length(); 690 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 691 /* do_zero */ true, CHECK_NULL); 692 } else { 693 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 694 } 695 696 HeapAccess<>::clone(obj(), new_obj_oop, size); 697 698 Handle new_obj(THREAD, new_obj_oop); 699 // Caution: this involves a java upcall, so the clone should be 700 // "gc-robust" by this stage. 701 if (klass->has_finalizer()) { 702 assert(obj->is_instance(), "should be instanceOop"); 703 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 704 new_obj = Handle(THREAD, new_obj_oop); 705 } 706 707 return JNIHandles::make_local(env, new_obj()); 708 JVM_END 709 710 // java.io.File /////////////////////////////////////////////////////////////// 711 712 JVM_LEAF(char*, JVM_NativePath(char* path)) 713 JVMWrapper("JVM_NativePath"); 714 return os::native_path(path); 715 JVM_END 716 717 718 // Misc. class handling /////////////////////////////////////////////////////////// 719 720 721 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 722 JVMWrapper("JVM_GetCallerClass"); 723 724 // Getting the class of the caller frame. 725 // 726 // The call stack at this point looks something like this: 727 // 728 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 729 // [1] [ @CallerSensitive API.method ] 730 // [.] [ (skipped intermediate frames) ] 731 // [n] [ caller ] 732 vframeStream vfst(thread); 733 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 734 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 735 Method* m = vfst.method(); 736 assert(m != NULL, "sanity"); 737 switch (n) { 738 case 0: 739 // This must only be called from Reflection.getCallerClass 740 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 741 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 742 } 743 // fall-through 744 case 1: 745 // Frame 0 and 1 must be caller sensitive. 746 if (!m->caller_sensitive()) { 747 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 748 } 749 break; 750 default: 751 if (!m->is_ignored_by_security_stack_walk()) { 752 // We have reached the desired frame; return the holder class. 753 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 754 } 755 break; 756 } 757 } 758 return NULL; 759 JVM_END 760 761 762 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 763 JVMWrapper("JVM_FindPrimitiveClass"); 764 oop mirror = NULL; 765 BasicType t = name2type(utf); 766 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 767 mirror = Universe::java_mirror(t); 768 } 769 if (mirror == NULL) { 770 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 771 } else { 772 return (jclass) JNIHandles::make_local(env, mirror); 773 } 774 JVM_END 775 776 777 // Returns a class loaded by the bootstrap class loader; or null 778 // if not found. ClassNotFoundException is not thrown. 779 // FindClassFromBootLoader is exported to the launcher for windows. 780 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 781 const char* name)) 782 JVMWrapper("JVM_FindClassFromBootLoader"); 783 784 // Java libraries should ensure that name is never null... 785 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 786 // It's impossible to create this class; the name cannot fit 787 // into the constant pool. 788 return NULL; 789 } 790 791 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 792 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 793 if (k == NULL) { 794 return NULL; 795 } 796 797 if (log_is_enabled(Debug, class, resolve)) { 798 trace_class_resolution(k); 799 } 800 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 801 JVM_END 802 803 // Find a class with this name in this loader, using the caller's protection domain. 804 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 805 jboolean init, jobject loader, 806 jclass caller)) 807 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 808 // Java libraries should ensure that name is never null... 809 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 810 // It's impossible to create this class; the name cannot fit 811 // into the constant pool. 812 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 813 } 814 815 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 816 817 oop loader_oop = JNIHandles::resolve(loader); 818 oop from_class = JNIHandles::resolve(caller); 819 oop protection_domain = NULL; 820 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 821 // NPE. Put it in another way, the bootstrap class loader has all permission and 822 // thus no checkPackageAccess equivalence in the VM class loader. 823 // The caller is also passed as NULL by the java code if there is no security 824 // manager to avoid the performance cost of getting the calling class. 825 if (from_class != NULL && loader_oop != NULL) { 826 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 827 } 828 829 Handle h_loader(THREAD, loader_oop); 830 Handle h_prot(THREAD, protection_domain); 831 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 832 h_prot, false, THREAD); 833 834 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 835 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 836 } 837 return result; 838 JVM_END 839 840 // Currently only called from the old verifier. 841 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 842 jboolean init, jclass from)) 843 JVMWrapper("JVM_FindClassFromClass"); 844 if (name == NULL) { 845 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 846 } 847 if ((int)strlen(name) > Symbol::max_length()) { 848 // It's impossible to create this class; the name cannot fit 849 // into the constant pool. 850 Exceptions::fthrow(THREAD_AND_LOCATION, 851 vmSymbols::java_lang_NoClassDefFoundError(), 852 "Class name exceeds maximum length of %d: %s", 853 Symbol::max_length(), 854 name); 855 return 0; 856 } 857 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 858 oop from_class_oop = JNIHandles::resolve(from); 859 Klass* from_class = (from_class_oop == NULL) 860 ? (Klass*)NULL 861 : java_lang_Class::as_Klass(from_class_oop); 862 oop class_loader = NULL; 863 oop protection_domain = NULL; 864 if (from_class != NULL) { 865 class_loader = from_class->class_loader(); 866 protection_domain = from_class->protection_domain(); 867 } 868 Handle h_loader(THREAD, class_loader); 869 Handle h_prot (THREAD, protection_domain); 870 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 871 h_prot, true, thread); 872 if (result != NULL) { 873 oop mirror = JNIHandles::resolve_non_null(result); 874 Klass* to_class = java_lang_Class::as_Klass(mirror); 875 ClassLoaderData::class_loader_data(h_loader())->record_dependency(to_class); 876 } 877 878 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 879 // this function is generally only used for class loading during verification. 880 ResourceMark rm; 881 oop from_mirror = JNIHandles::resolve_non_null(from); 882 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 883 const char * from_name = from_class->external_name(); 884 885 oop mirror = JNIHandles::resolve_non_null(result); 886 Klass* to_class = java_lang_Class::as_Klass(mirror); 887 const char * to = to_class->external_name(); 888 log_debug(class, resolve)("%s %s (verification)", from_name, to); 889 } 890 891 return result; 892 JVM_END 893 894 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 895 if (loader.is_null()) { 896 return; 897 } 898 899 // check whether the current caller thread holds the lock or not. 900 // If not, increment the corresponding counter 901 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 902 ObjectSynchronizer::owner_self) { 903 counter->inc(); 904 } 905 } 906 907 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 908 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 909 jobject loader, const jbyte *buf, 910 jsize len, jobject pd, const char *source, 911 TRAPS) { 912 if (source == NULL) source = "__JVM_DefineClass__"; 913 914 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 915 JavaThread* jt = (JavaThread*) THREAD; 916 917 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 918 ClassLoader::perf_define_appclass_selftime(), 919 ClassLoader::perf_define_appclasses(), 920 jt->get_thread_stat()->perf_recursion_counts_addr(), 921 jt->get_thread_stat()->perf_timers_addr(), 922 PerfClassTraceTime::DEFINE_CLASS); 923 924 if (UsePerfData) { 925 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 926 } 927 928 // Since exceptions can be thrown, class initialization can take place 929 // if name is NULL no check for class name in .class stream has to be made. 930 TempNewSymbol class_name = NULL; 931 if (name != NULL) { 932 const int str_len = (int)strlen(name); 933 if (str_len > Symbol::max_length()) { 934 // It's impossible to create this class; the name cannot fit 935 // into the constant pool. 936 Exceptions::fthrow(THREAD_AND_LOCATION, 937 vmSymbols::java_lang_NoClassDefFoundError(), 938 "Class name exceeds maximum length of %d: %s", 939 Symbol::max_length(), 940 name); 941 return 0; 942 } 943 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 944 } 945 946 ResourceMark rm(THREAD); 947 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 948 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 949 if (UsePerfData) { 950 is_lock_held_by_thread(class_loader, 951 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 952 THREAD); 953 } 954 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 955 Klass* k = SystemDictionary::resolve_from_stream(class_name, 956 class_loader, 957 protection_domain, 958 &st, 959 CHECK_NULL); 960 961 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 962 trace_class_resolution(k); 963 } 964 965 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 966 } 967 968 969 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 970 JVMWrapper("JVM_DefineClass"); 971 972 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 973 JVM_END 974 975 976 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 977 JVMWrapper("JVM_DefineClassWithSource"); 978 979 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 980 JVM_END 981 982 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 983 JVMWrapper("JVM_FindLoadedClass"); 984 ResourceMark rm(THREAD); 985 986 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 987 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 988 989 const char* str = java_lang_String::as_utf8_string(string()); 990 // Sanity check, don't expect null 991 if (str == NULL) return NULL; 992 993 const int str_len = (int)strlen(str); 994 if (str_len > Symbol::max_length()) { 995 // It's impossible to create this class; the name cannot fit 996 // into the constant pool. 997 return NULL; 998 } 999 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 1000 1001 // Security Note: 1002 // The Java level wrapper will perform the necessary security check allowing 1003 // us to pass the NULL as the initiating class loader. 1004 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1005 if (UsePerfData) { 1006 is_lock_held_by_thread(h_loader, 1007 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1008 THREAD); 1009 } 1010 1011 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1012 h_loader, 1013 Handle(), 1014 CHECK_NULL); 1015 #if INCLUDE_CDS 1016 if (k == NULL) { 1017 // If the class is not already loaded, try to see if it's in the shared 1018 // archive for the current classloader (h_loader). 1019 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1020 } 1021 #endif 1022 return (k == NULL) ? NULL : 1023 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1024 JVM_END 1025 1026 // Module support ////////////////////////////////////////////////////////////////////////////// 1027 1028 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1029 jstring location, const char* const* packages, jsize num_packages)) 1030 JVMWrapper("JVM_DefineModule"); 1031 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1032 JVM_END 1033 1034 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1035 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1036 Modules::set_bootloader_unnamed_module(module, CHECK); 1037 JVM_END 1038 1039 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1040 JVMWrapper("JVM_AddModuleExports"); 1041 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1042 JVM_END 1043 1044 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1045 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1046 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1047 JVM_END 1048 1049 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1050 JVMWrapper("JVM_AddModuleExportsToAll"); 1051 Modules::add_module_exports(from_module, package, NULL, CHECK); 1052 JVM_END 1053 1054 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1055 JVMWrapper("JVM_AddReadsModule"); 1056 Modules::add_reads_module(from_module, source_module, CHECK); 1057 JVM_END 1058 1059 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1060 1061 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1062 assert (cls != NULL, "illegal class"); 1063 JVMWrapper("JVM_GetClassName"); 1064 JvmtiVMObjectAllocEventCollector oam; 1065 ResourceMark rm(THREAD); 1066 const char* name; 1067 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1068 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1069 } else { 1070 // Consider caching interned string in Klass 1071 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1072 assert(k->is_klass(), "just checking"); 1073 name = k->external_name(); 1074 } 1075 oop result = StringTable::intern((char*) name, CHECK_NULL); 1076 return (jstring) JNIHandles::make_local(env, result); 1077 JVM_END 1078 1079 1080 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1081 JVMWrapper("JVM_GetClassInterfaces"); 1082 JvmtiVMObjectAllocEventCollector oam; 1083 oop mirror = JNIHandles::resolve_non_null(cls); 1084 1085 // Special handling for primitive objects 1086 if (java_lang_Class::is_primitive(mirror)) { 1087 // Primitive objects does not have any interfaces 1088 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1089 return (jobjectArray) JNIHandles::make_local(env, r); 1090 } 1091 1092 Klass* klass = java_lang_Class::as_Klass(mirror); 1093 // Figure size of result array 1094 int size; 1095 if (klass->is_instance_klass()) { 1096 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1097 } else { 1098 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1099 size = 2; 1100 } 1101 1102 // Allocate result array 1103 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1104 objArrayHandle result (THREAD, r); 1105 // Fill in result 1106 if (klass->is_instance_klass()) { 1107 // Regular instance klass, fill in all local interfaces 1108 for (int index = 0; index < size; index++) { 1109 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1110 result->obj_at_put(index, k->java_mirror()); 1111 } 1112 } else { 1113 // All arrays implement java.lang.Cloneable and java.io.Serializable 1114 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1115 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1116 } 1117 return (jobjectArray) JNIHandles::make_local(env, result()); 1118 JVM_END 1119 1120 1121 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1122 JVMWrapper("JVM_IsInterface"); 1123 oop mirror = JNIHandles::resolve_non_null(cls); 1124 if (java_lang_Class::is_primitive(mirror)) { 1125 return JNI_FALSE; 1126 } 1127 Klass* k = java_lang_Class::as_Klass(mirror); 1128 jboolean result = k->is_interface(); 1129 assert(!result || k->is_instance_klass(), 1130 "all interfaces are instance types"); 1131 // The compiler intrinsic for isInterface tests the 1132 // Klass::_access_flags bits in the same way. 1133 return result; 1134 JVM_END 1135 1136 1137 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1138 JVMWrapper("JVM_GetClassSigners"); 1139 JvmtiVMObjectAllocEventCollector oam; 1140 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1141 // There are no signers for primitive types 1142 return NULL; 1143 } 1144 1145 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls))); 1146 1147 // If there are no signers set in the class, or if the class 1148 // is an array, return NULL. 1149 if (signers == NULL) return NULL; 1150 1151 // copy of the signers array 1152 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1153 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1154 for (int index = 0; index < signers->length(); index++) { 1155 signers_copy->obj_at_put(index, signers->obj_at(index)); 1156 } 1157 1158 // return the copy 1159 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1160 JVM_END 1161 1162 1163 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1164 JVMWrapper("JVM_SetClassSigners"); 1165 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1166 // This call is ignored for primitive types and arrays. 1167 // Signers are only set once, ClassLoader.java, and thus shouldn't 1168 // be called with an array. Only the bootstrap loader creates arrays. 1169 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1170 if (k->is_instance_klass()) { 1171 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1172 } 1173 } 1174 JVM_END 1175 1176 1177 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1178 JVMWrapper("JVM_GetProtectionDomain"); 1179 if (JNIHandles::resolve(cls) == NULL) { 1180 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1181 } 1182 1183 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1184 // Primitive types does not have a protection domain. 1185 return NULL; 1186 } 1187 1188 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1189 return (jobject) JNIHandles::make_local(env, pd); 1190 JVM_END 1191 1192 1193 // Returns the inherited_access_control_context field of the running thread. 1194 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1195 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1196 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1197 return JNIHandles::make_local(env, result); 1198 JVM_END 1199 1200 class RegisterArrayForGC { 1201 private: 1202 JavaThread *_thread; 1203 public: 1204 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1205 _thread = thread; 1206 _thread->register_array_for_gc(array); 1207 } 1208 1209 ~RegisterArrayForGC() { 1210 _thread->register_array_for_gc(NULL); 1211 } 1212 }; 1213 1214 1215 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1216 JVMWrapper("JVM_GetStackAccessControlContext"); 1217 if (!UsePrivilegedStack) return NULL; 1218 1219 ResourceMark rm(THREAD); 1220 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1221 JvmtiVMObjectAllocEventCollector oam; 1222 1223 // count the protection domains on the execution stack. We collapse 1224 // duplicate consecutive protection domains into a single one, as 1225 // well as stopping when we hit a privileged frame. 1226 1227 oop previous_protection_domain = NULL; 1228 Handle privileged_context(thread, NULL); 1229 bool is_privileged = false; 1230 oop protection_domain = NULL; 1231 1232 // Iterate through Java frames 1233 RegisterMap reg_map(thread); 1234 javaVFrame *vf = thread->last_java_vframe(®_map); 1235 for (; vf != NULL; vf = vf->java_sender()) { 1236 // get method of frame 1237 Method* method = vf->method(); 1238 1239 // stop at the first privileged frame 1240 if (method->method_holder() == SystemDictionary::AccessController_klass() && 1241 method->name() == vmSymbols::executePrivileged_name()) 1242 { 1243 // this frame is privileged 1244 is_privileged = true; 1245 1246 javaVFrame *priv = vf; // executePrivileged 1247 javaVFrame *caller_fr = priv->java_sender(); // doPrivileged 1248 caller_fr = caller_fr->java_sender(); // caller 1249 1250 StackValueCollection* locals = priv->locals(); 1251 privileged_context = locals->obj_at(1); 1252 Handle caller = locals->obj_at(2); 1253 1254 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1255 protection_domain = caller_klass->protection_domain(); 1256 } else { 1257 protection_domain = method->method_holder()->protection_domain(); 1258 } 1259 1260 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) { 1261 local_array->push(protection_domain); 1262 previous_protection_domain = protection_domain; 1263 } 1264 1265 if (is_privileged) break; 1266 } 1267 1268 1269 // either all the domains on the stack were system domains, or 1270 // we had a privileged system domain 1271 if (local_array->is_empty()) { 1272 if (is_privileged && privileged_context.is_null()) return NULL; 1273 1274 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1275 return JNIHandles::make_local(env, result); 1276 } 1277 1278 // the resource area must be registered in case of a gc 1279 RegisterArrayForGC ragc(thread, local_array); 1280 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1281 local_array->length(), CHECK_NULL); 1282 objArrayHandle h_context(thread, context); 1283 for (int index = 0; index < local_array->length(); index++) { 1284 h_context->obj_at_put(index, local_array->at(index)); 1285 } 1286 1287 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1288 1289 return JNIHandles::make_local(env, result); 1290 JVM_END 1291 1292 1293 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1294 JVMWrapper("JVM_IsArrayClass"); 1295 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1296 return (k != NULL) && k->is_array_klass() ? true : false; 1297 JVM_END 1298 1299 1300 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1301 JVMWrapper("JVM_IsPrimitiveClass"); 1302 oop mirror = JNIHandles::resolve_non_null(cls); 1303 return (jboolean) java_lang_Class::is_primitive(mirror); 1304 JVM_END 1305 1306 1307 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1308 JVMWrapper("JVM_GetClassModifiers"); 1309 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1310 // Primitive type 1311 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1312 } 1313 1314 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1315 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1316 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1317 return k->modifier_flags(); 1318 JVM_END 1319 1320 1321 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1322 1323 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1324 JvmtiVMObjectAllocEventCollector oam; 1325 // ofClass is a reference to a java_lang_Class object. The mirror object 1326 // of an InstanceKlass 1327 1328 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1329 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1330 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1331 return (jobjectArray)JNIHandles::make_local(env, result); 1332 } 1333 1334 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1335 InnerClassesIterator iter(k); 1336 1337 if (iter.length() == 0) { 1338 // Neither an inner nor outer class 1339 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1340 return (jobjectArray)JNIHandles::make_local(env, result); 1341 } 1342 1343 // find inner class info 1344 constantPoolHandle cp(thread, k->constants()); 1345 int length = iter.length(); 1346 1347 // Allocate temp. result array 1348 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1349 objArrayHandle result (THREAD, r); 1350 int members = 0; 1351 1352 for (; !iter.done(); iter.next()) { 1353 int ioff = iter.inner_class_info_index(); 1354 int ooff = iter.outer_class_info_index(); 1355 1356 if (ioff != 0 && ooff != 0) { 1357 // Check to see if the name matches the class we're looking for 1358 // before attempting to find the class. 1359 if (cp->klass_name_at_matches(k, ooff)) { 1360 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1361 if (outer_klass == k) { 1362 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1363 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1364 1365 // Throws an exception if outer klass has not declared k as 1366 // an inner klass 1367 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1368 1369 result->obj_at_put(members, inner_klass->java_mirror()); 1370 members++; 1371 } 1372 } 1373 } 1374 } 1375 1376 if (members != length) { 1377 // Return array of right length 1378 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1379 for(int i = 0; i < members; i++) { 1380 res->obj_at_put(i, result->obj_at(i)); 1381 } 1382 return (jobjectArray)JNIHandles::make_local(env, res); 1383 } 1384 1385 return (jobjectArray)JNIHandles::make_local(env, result()); 1386 JVM_END 1387 1388 1389 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1390 { 1391 // ofClass is a reference to a java_lang_Class object. 1392 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1393 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1394 return NULL; 1395 } 1396 1397 bool inner_is_member = false; 1398 Klass* outer_klass 1399 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1400 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1401 if (outer_klass == NULL) return NULL; // already a top-level class 1402 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1403 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1404 } 1405 JVM_END 1406 1407 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1408 { 1409 oop mirror = JNIHandles::resolve_non_null(cls); 1410 if (java_lang_Class::is_primitive(mirror) || 1411 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1412 return NULL; 1413 } 1414 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1415 int ooff = 0, noff = 0; 1416 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1417 if (noff != 0) { 1418 constantPoolHandle i_cp(thread, k->constants()); 1419 Symbol* name = i_cp->symbol_at(noff); 1420 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1421 return (jstring) JNIHandles::make_local(env, str()); 1422 } 1423 } 1424 return NULL; 1425 } 1426 JVM_END 1427 1428 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1429 assert (cls != NULL, "illegal class"); 1430 JVMWrapper("JVM_GetClassSignature"); 1431 JvmtiVMObjectAllocEventCollector oam; 1432 ResourceMark rm(THREAD); 1433 // Return null for arrays and primatives 1434 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1435 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1436 if (k->is_instance_klass()) { 1437 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1438 if (sym == NULL) return NULL; 1439 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1440 return (jstring) JNIHandles::make_local(env, str()); 1441 } 1442 } 1443 return NULL; 1444 JVM_END 1445 1446 1447 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1448 assert (cls != NULL, "illegal class"); 1449 JVMWrapper("JVM_GetClassAnnotations"); 1450 1451 // Return null for arrays and primitives 1452 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1453 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1454 if (k->is_instance_klass()) { 1455 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1456 return (jbyteArray) JNIHandles::make_local(env, a); 1457 } 1458 } 1459 return NULL; 1460 JVM_END 1461 1462 1463 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1464 // some of this code was adapted from from jni_FromReflectedField 1465 1466 oop reflected = JNIHandles::resolve_non_null(field); 1467 oop mirror = java_lang_reflect_Field::clazz(reflected); 1468 Klass* k = java_lang_Class::as_Klass(mirror); 1469 int slot = java_lang_reflect_Field::slot(reflected); 1470 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1471 1472 InstanceKlass* ik = InstanceKlass::cast(k); 1473 intptr_t offset = ik->field_offset(slot); 1474 1475 if (modifiers & JVM_ACC_STATIC) { 1476 // for static fields we only look in the current class 1477 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1478 assert(false, "cannot find static field"); 1479 return false; 1480 } 1481 } else { 1482 // for instance fields we start with the current class and work 1483 // our way up through the superclass chain 1484 if (!ik->find_field_from_offset(offset, false, &fd)) { 1485 assert(false, "cannot find instance field"); 1486 return false; 1487 } 1488 } 1489 return true; 1490 } 1491 1492 static Method* jvm_get_method_common(jobject method) { 1493 // some of this code was adapted from from jni_FromReflectedMethod 1494 1495 oop reflected = JNIHandles::resolve_non_null(method); 1496 oop mirror = NULL; 1497 int slot = 0; 1498 1499 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1500 mirror = java_lang_reflect_Constructor::clazz(reflected); 1501 slot = java_lang_reflect_Constructor::slot(reflected); 1502 } else { 1503 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1504 "wrong type"); 1505 mirror = java_lang_reflect_Method::clazz(reflected); 1506 slot = java_lang_reflect_Method::slot(reflected); 1507 } 1508 Klass* k = java_lang_Class::as_Klass(mirror); 1509 1510 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1511 assert(m != NULL, "cannot find method"); 1512 return m; // caller has to deal with NULL in product mode 1513 } 1514 1515 /* Type use annotations support (JDK 1.8) */ 1516 1517 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1518 assert (cls != NULL, "illegal class"); 1519 JVMWrapper("JVM_GetClassTypeAnnotations"); 1520 ResourceMark rm(THREAD); 1521 // Return null for arrays and primitives 1522 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1523 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1524 if (k->is_instance_klass()) { 1525 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1526 if (type_annotations != NULL) { 1527 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1528 return (jbyteArray) JNIHandles::make_local(env, a); 1529 } 1530 } 1531 } 1532 return NULL; 1533 JVM_END 1534 1535 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1536 assert (method != NULL, "illegal method"); 1537 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1538 1539 // method is a handle to a java.lang.reflect.Method object 1540 Method* m = jvm_get_method_common(method); 1541 if (m == NULL) { 1542 return NULL; 1543 } 1544 1545 AnnotationArray* type_annotations = m->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 return NULL; 1552 JVM_END 1553 1554 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1555 assert (field != NULL, "illegal field"); 1556 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1557 1558 fieldDescriptor fd; 1559 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1560 if (!gotFd) { 1561 return NULL; 1562 } 1563 1564 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1565 JVM_END 1566 1567 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1568 if (!cp->is_within_bounds(index)) { 1569 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1570 } 1571 } 1572 1573 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1574 { 1575 JVMWrapper("JVM_GetMethodParameters"); 1576 // method is a handle to a java.lang.reflect.Method object 1577 Method* method_ptr = jvm_get_method_common(method); 1578 methodHandle mh (THREAD, method_ptr); 1579 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1580 const int num_params = mh->method_parameters_length(); 1581 1582 if (num_params < 0) { 1583 // A -1 return value from method_parameters_length means there is no 1584 // parameter data. Return null to indicate this to the reflection 1585 // API. 1586 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1587 return (jobjectArray)NULL; 1588 } else { 1589 // Otherwise, we return something up to reflection, even if it is 1590 // a zero-length array. Why? Because in some cases this can 1591 // trigger a MalformedParametersException. 1592 1593 // make sure all the symbols are properly formatted 1594 for (int i = 0; i < num_params; i++) { 1595 MethodParametersElement* params = mh->method_parameters_start(); 1596 int index = params[i].name_cp_index; 1597 bounds_check(mh->constants(), index, CHECK_NULL); 1598 1599 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1600 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1601 "Wrong type at constant pool index"); 1602 } 1603 1604 } 1605 1606 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1607 objArrayHandle result (THREAD, result_oop); 1608 1609 for (int i = 0; i < num_params; i++) { 1610 MethodParametersElement* params = mh->method_parameters_start(); 1611 // For a 0 index, give a NULL symbol 1612 Symbol* sym = 0 != params[i].name_cp_index ? 1613 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1614 int flags = params[i].flags; 1615 oop param = Reflection::new_parameter(reflected_method, i, sym, 1616 flags, CHECK_NULL); 1617 result->obj_at_put(i, param); 1618 } 1619 return (jobjectArray)JNIHandles::make_local(env, result()); 1620 } 1621 } 1622 JVM_END 1623 1624 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1625 1626 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1627 { 1628 JVMWrapper("JVM_GetClassDeclaredFields"); 1629 JvmtiVMObjectAllocEventCollector oam; 1630 1631 // Exclude primitive types and array types 1632 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1633 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1634 // Return empty array 1635 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1636 return (jobjectArray) JNIHandles::make_local(env, res); 1637 } 1638 1639 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1640 constantPoolHandle cp(THREAD, k->constants()); 1641 1642 // Ensure class is linked 1643 k->link_class(CHECK_NULL); 1644 1645 // Allocate result 1646 int num_fields; 1647 1648 if (publicOnly) { 1649 num_fields = 0; 1650 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1651 if (fs.access_flags().is_public()) ++num_fields; 1652 } 1653 } else { 1654 num_fields = k->java_fields_count(); 1655 } 1656 1657 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1658 objArrayHandle result (THREAD, r); 1659 1660 int out_idx = 0; 1661 fieldDescriptor fd; 1662 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1663 if (!publicOnly || fs.access_flags().is_public()) { 1664 fd.reinitialize(k, fs.index()); 1665 oop field = Reflection::new_field(&fd, CHECK_NULL); 1666 result->obj_at_put(out_idx, field); 1667 ++out_idx; 1668 } 1669 } 1670 assert(out_idx == num_fields, "just checking"); 1671 return (jobjectArray) JNIHandles::make_local(env, result()); 1672 } 1673 JVM_END 1674 1675 static bool select_method(const methodHandle& method, bool want_constructor) { 1676 if (want_constructor) { 1677 return (method->is_initializer() && !method->is_static()); 1678 } else { 1679 return (!method->is_initializer() && !method->is_overpass()); 1680 } 1681 } 1682 1683 static jobjectArray get_class_declared_methods_helper( 1684 JNIEnv *env, 1685 jclass ofClass, jboolean publicOnly, 1686 bool want_constructor, 1687 Klass* klass, TRAPS) { 1688 1689 JvmtiVMObjectAllocEventCollector oam; 1690 1691 // Exclude primitive types and array types 1692 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1693 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1694 // Return empty array 1695 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1696 return (jobjectArray) JNIHandles::make_local(env, res); 1697 } 1698 1699 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1700 1701 // Ensure class is linked 1702 k->link_class(CHECK_NULL); 1703 1704 Array<Method*>* methods = k->methods(); 1705 int methods_length = methods->length(); 1706 1707 // Save original method_idnum in case of redefinition, which can change 1708 // the idnum of obsolete methods. The new method will have the same idnum 1709 // but if we refresh the methods array, the counts will be wrong. 1710 ResourceMark rm(THREAD); 1711 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1712 int num_methods = 0; 1713 1714 for (int i = 0; i < methods_length; i++) { 1715 methodHandle method(THREAD, methods->at(i)); 1716 if (select_method(method, want_constructor)) { 1717 if (!publicOnly || method->is_public()) { 1718 idnums->push(method->method_idnum()); 1719 ++num_methods; 1720 } 1721 } 1722 } 1723 1724 // Allocate result 1725 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1726 objArrayHandle result (THREAD, r); 1727 1728 // Now just put the methods that we selected above, but go by their idnum 1729 // in case of redefinition. The methods can be redefined at any safepoint, 1730 // so above when allocating the oop array and below when creating reflect 1731 // objects. 1732 for (int i = 0; i < num_methods; i++) { 1733 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1734 if (method.is_null()) { 1735 // Method may have been deleted and seems this API can handle null 1736 // Otherwise should probably put a method that throws NSME 1737 result->obj_at_put(i, NULL); 1738 } else { 1739 oop m; 1740 if (want_constructor) { 1741 m = Reflection::new_constructor(method, CHECK_NULL); 1742 } else { 1743 m = Reflection::new_method(method, false, CHECK_NULL); 1744 } 1745 result->obj_at_put(i, m); 1746 } 1747 } 1748 1749 return (jobjectArray) JNIHandles::make_local(env, result()); 1750 } 1751 1752 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1753 { 1754 JVMWrapper("JVM_GetClassDeclaredMethods"); 1755 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1756 /*want_constructor*/ false, 1757 SystemDictionary::reflect_Method_klass(), THREAD); 1758 } 1759 JVM_END 1760 1761 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1762 { 1763 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1764 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1765 /*want_constructor*/ true, 1766 SystemDictionary::reflect_Constructor_klass(), THREAD); 1767 } 1768 JVM_END 1769 1770 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1771 { 1772 JVMWrapper("JVM_GetClassAccessFlags"); 1773 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1774 // Primitive type 1775 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1776 } 1777 1778 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1779 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1780 } 1781 JVM_END 1782 1783 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1784 { 1785 JVMWrapper("JVM_AreNestMates"); 1786 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1787 assert(c->is_instance_klass(), "must be"); 1788 InstanceKlass* ck = InstanceKlass::cast(c); 1789 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 1790 assert(m->is_instance_klass(), "must be"); 1791 InstanceKlass* mk = InstanceKlass::cast(m); 1792 return ck->has_nestmate_access_to(mk, THREAD); 1793 } 1794 JVM_END 1795 1796 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1797 { 1798 // current is not a primitive or array class 1799 JVMWrapper("JVM_GetNestHost"); 1800 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1801 assert(c->is_instance_klass(), "must be"); 1802 InstanceKlass* ck = InstanceKlass::cast(c); 1803 // Don't post exceptions if validation fails 1804 InstanceKlass* host = ck->nest_host(NULL, THREAD); 1805 return (jclass) (host == NULL ? NULL : 1806 JNIHandles::make_local(THREAD, host->java_mirror())); 1807 } 1808 JVM_END 1809 1810 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1811 { 1812 // current is not a primitive or array class 1813 JVMWrapper("JVM_GetNestMembers"); 1814 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1815 assert(c->is_instance_klass(), "must be"); 1816 InstanceKlass* ck = InstanceKlass::cast(c); 1817 // Get the nest host for this nest - throw ICCE if validation fails 1818 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError(); 1819 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL); 1820 1821 { 1822 JvmtiVMObjectAllocEventCollector oam; 1823 Array<u2>* members = host->nest_members(); 1824 int length = members == NULL ? 0 : members->length(); 1825 // nest host is first in the array so make it one bigger 1826 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 1827 length + 1, CHECK_NULL); 1828 objArrayHandle result (THREAD, r); 1829 result->obj_at_put(0, host->java_mirror()); 1830 if (length != 0) { 1831 int i; 1832 for (i = 0; i < length; i++) { 1833 int cp_index = members->at(i); 1834 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL); 1835 if (k->is_instance_klass()) { 1836 InstanceKlass* nest_host_k = 1837 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL); 1838 if (nest_host_k == host) { 1839 result->obj_at_put(i+1, k->java_mirror()); 1840 } 1841 else { 1842 // k's nest host is legal but it isn't our host so 1843 // throw ICCE 1844 ResourceMark rm(THREAD); 1845 Exceptions::fthrow(THREAD_AND_LOCATION, 1846 icce, 1847 "Nest member %s in %s declares a different nest host of %s", 1848 k->external_name(), 1849 host->external_name(), 1850 nest_host_k->external_name() 1851 ); 1852 return NULL; 1853 } 1854 } 1855 else { 1856 // we have a bad nest member entry - throw ICCE 1857 ResourceMark rm(THREAD); 1858 Exceptions::fthrow(THREAD_AND_LOCATION, 1859 icce, 1860 "Class %s can not be a nest member of %s", 1861 k->external_name(), 1862 host->external_name() 1863 ); 1864 return NULL; 1865 } 1866 } 1867 } 1868 else { 1869 assert(host == ck, "must be singleton nest"); 1870 } 1871 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1872 } 1873 } 1874 JVM_END 1875 1876 // Constant pool access ////////////////////////////////////////////////////////// 1877 1878 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1879 { 1880 JVMWrapper("JVM_GetClassConstantPool"); 1881 JvmtiVMObjectAllocEventCollector oam; 1882 1883 // Return null for primitives and arrays 1884 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1885 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1886 if (k->is_instance_klass()) { 1887 InstanceKlass* k_h = InstanceKlass::cast(k); 1888 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1889 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1890 return JNIHandles::make_local(jcp()); 1891 } 1892 } 1893 return NULL; 1894 } 1895 JVM_END 1896 1897 1898 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1899 { 1900 JVMWrapper("JVM_ConstantPoolGetSize"); 1901 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1902 return cp->length(); 1903 } 1904 JVM_END 1905 1906 1907 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1908 { 1909 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1910 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1911 bounds_check(cp, index, CHECK_NULL); 1912 constantTag tag = cp->tag_at(index); 1913 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1914 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1915 } 1916 Klass* k = cp->klass_at(index, CHECK_NULL); 1917 return (jclass) JNIHandles::make_local(k->java_mirror()); 1918 } 1919 JVM_END 1920 1921 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1922 { 1923 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1924 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1925 bounds_check(cp, index, CHECK_NULL); 1926 constantTag tag = cp->tag_at(index); 1927 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1928 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1929 } 1930 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1931 if (k == NULL) return NULL; 1932 return (jclass) JNIHandles::make_local(k->java_mirror()); 1933 } 1934 JVM_END 1935 1936 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 1937 constantTag tag = cp->tag_at(index); 1938 if (!tag.is_method() && !tag.is_interface_method()) { 1939 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1940 } 1941 int klass_ref = cp->uncached_klass_ref_index_at(index); 1942 Klass* k_o; 1943 if (force_resolution) { 1944 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1945 } else { 1946 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1947 if (k_o == NULL) return NULL; 1948 } 1949 InstanceKlass* k = InstanceKlass::cast(k_o); 1950 Symbol* name = cp->uncached_name_ref_at(index); 1951 Symbol* sig = cp->uncached_signature_ref_at(index); 1952 methodHandle m (THREAD, k->find_method(name, sig)); 1953 if (m.is_null()) { 1954 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1955 } 1956 oop method; 1957 if (!m->is_initializer() || m->is_static()) { 1958 method = Reflection::new_method(m, true, CHECK_NULL); 1959 } else { 1960 method = Reflection::new_constructor(m, CHECK_NULL); 1961 } 1962 return JNIHandles::make_local(method); 1963 } 1964 1965 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1966 { 1967 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1968 JvmtiVMObjectAllocEventCollector oam; 1969 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1970 bounds_check(cp, index, CHECK_NULL); 1971 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1972 return res; 1973 } 1974 JVM_END 1975 1976 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1977 { 1978 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 1979 JvmtiVMObjectAllocEventCollector oam; 1980 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1981 bounds_check(cp, index, CHECK_NULL); 1982 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 1983 return res; 1984 } 1985 JVM_END 1986 1987 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1988 constantTag tag = cp->tag_at(index); 1989 if (!tag.is_field()) { 1990 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1991 } 1992 int klass_ref = cp->uncached_klass_ref_index_at(index); 1993 Klass* k_o; 1994 if (force_resolution) { 1995 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1996 } else { 1997 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1998 if (k_o == NULL) return NULL; 1999 } 2000 InstanceKlass* k = InstanceKlass::cast(k_o); 2001 Symbol* name = cp->uncached_name_ref_at(index); 2002 Symbol* sig = cp->uncached_signature_ref_at(index); 2003 fieldDescriptor fd; 2004 Klass* target_klass = k->find_field(name, sig, &fd); 2005 if (target_klass == NULL) { 2006 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2007 } 2008 oop field = Reflection::new_field(&fd, CHECK_NULL); 2009 return JNIHandles::make_local(field); 2010 } 2011 2012 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2013 { 2014 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2015 JvmtiVMObjectAllocEventCollector oam; 2016 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2017 bounds_check(cp, index, CHECK_NULL); 2018 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2019 return res; 2020 } 2021 JVM_END 2022 2023 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2024 { 2025 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2026 JvmtiVMObjectAllocEventCollector oam; 2027 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2028 bounds_check(cp, index, CHECK_NULL); 2029 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2030 return res; 2031 } 2032 JVM_END 2033 2034 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2035 { 2036 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2037 JvmtiVMObjectAllocEventCollector oam; 2038 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2039 bounds_check(cp, index, CHECK_NULL); 2040 constantTag tag = cp->tag_at(index); 2041 if (!tag.is_field_or_method()) { 2042 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2043 } 2044 int klass_ref = cp->uncached_klass_ref_index_at(index); 2045 Symbol* klass_name = cp->klass_name_at(klass_ref); 2046 Symbol* member_name = cp->uncached_name_ref_at(index); 2047 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2048 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2049 objArrayHandle dest(THREAD, dest_o); 2050 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2051 dest->obj_at_put(0, str()); 2052 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2053 dest->obj_at_put(1, str()); 2054 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2055 dest->obj_at_put(2, str()); 2056 return (jobjectArray) JNIHandles::make_local(dest()); 2057 } 2058 JVM_END 2059 2060 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2061 { 2062 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2063 JvmtiVMObjectAllocEventCollector oam; 2064 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2065 bounds_check(cp, index, CHECK_0); 2066 constantTag tag = cp->tag_at(index); 2067 if (!tag.is_field_or_method()) { 2068 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2069 } 2070 return (jint) cp->uncached_klass_ref_index_at(index); 2071 } 2072 JVM_END 2073 2074 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2075 { 2076 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2077 JvmtiVMObjectAllocEventCollector oam; 2078 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2079 bounds_check(cp, index, CHECK_0); 2080 constantTag tag = cp->tag_at(index); 2081 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2082 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2083 } 2084 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2085 } 2086 JVM_END 2087 2088 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2089 { 2090 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2091 JvmtiVMObjectAllocEventCollector oam; 2092 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2093 bounds_check(cp, index, CHECK_NULL); 2094 constantTag tag = cp->tag_at(index); 2095 if (!tag.is_name_and_type()) { 2096 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2097 } 2098 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2099 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2100 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2101 objArrayHandle dest(THREAD, dest_o); 2102 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2103 dest->obj_at_put(0, str()); 2104 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2105 dest->obj_at_put(1, str()); 2106 return (jobjectArray) JNIHandles::make_local(dest()); 2107 } 2108 JVM_END 2109 2110 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2111 { 2112 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2113 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2114 bounds_check(cp, index, CHECK_0); 2115 constantTag tag = cp->tag_at(index); 2116 if (!tag.is_int()) { 2117 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2118 } 2119 return cp->int_at(index); 2120 } 2121 JVM_END 2122 2123 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2124 { 2125 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2126 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2127 bounds_check(cp, index, CHECK_(0L)); 2128 constantTag tag = cp->tag_at(index); 2129 if (!tag.is_long()) { 2130 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2131 } 2132 return cp->long_at(index); 2133 } 2134 JVM_END 2135 2136 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2137 { 2138 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2139 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2140 bounds_check(cp, index, CHECK_(0.0f)); 2141 constantTag tag = cp->tag_at(index); 2142 if (!tag.is_float()) { 2143 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2144 } 2145 return cp->float_at(index); 2146 } 2147 JVM_END 2148 2149 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2150 { 2151 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2152 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2153 bounds_check(cp, index, CHECK_(0.0)); 2154 constantTag tag = cp->tag_at(index); 2155 if (!tag.is_double()) { 2156 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2157 } 2158 return cp->double_at(index); 2159 } 2160 JVM_END 2161 2162 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2163 { 2164 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2165 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2166 bounds_check(cp, index, CHECK_NULL); 2167 constantTag tag = cp->tag_at(index); 2168 if (!tag.is_string()) { 2169 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2170 } 2171 oop str = cp->string_at(index, CHECK_NULL); 2172 return (jstring) JNIHandles::make_local(str); 2173 } 2174 JVM_END 2175 2176 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2177 { 2178 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2179 JvmtiVMObjectAllocEventCollector oam; 2180 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2181 bounds_check(cp, index, CHECK_NULL); 2182 constantTag tag = cp->tag_at(index); 2183 if (!tag.is_symbol()) { 2184 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2185 } 2186 Symbol* sym = cp->symbol_at(index); 2187 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2188 return (jstring) JNIHandles::make_local(str()); 2189 } 2190 JVM_END 2191 2192 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2193 { 2194 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2195 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2196 bounds_check(cp, index, CHECK_0); 2197 constantTag tag = cp->tag_at(index); 2198 jbyte result = tag.value(); 2199 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2200 // they are changed to the corresponding tags from the JVM spec, so that java code in 2201 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2202 if (tag.is_klass_or_reference()) { 2203 result = JVM_CONSTANT_Class; 2204 } else if (tag.is_string_index()) { 2205 result = JVM_CONSTANT_String; 2206 } else if (tag.is_method_type_in_error()) { 2207 result = JVM_CONSTANT_MethodType; 2208 } else if (tag.is_method_handle_in_error()) { 2209 result = JVM_CONSTANT_MethodHandle; 2210 } else if (tag.is_dynamic_constant_in_error()) { 2211 result = JVM_CONSTANT_Dynamic; 2212 } 2213 return result; 2214 } 2215 JVM_END 2216 2217 // Assertion support. ////////////////////////////////////////////////////////// 2218 2219 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2220 JVMWrapper("JVM_DesiredAssertionStatus"); 2221 assert(cls != NULL, "bad class"); 2222 2223 oop r = JNIHandles::resolve(cls); 2224 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2225 if (java_lang_Class::is_primitive(r)) return false; 2226 2227 Klass* k = java_lang_Class::as_Klass(r); 2228 assert(k->is_instance_klass(), "must be an instance klass"); 2229 if (!k->is_instance_klass()) return false; 2230 2231 ResourceMark rm(THREAD); 2232 const char* name = k->name()->as_C_string(); 2233 bool system_class = k->class_loader() == NULL; 2234 return JavaAssertions::enabled(name, system_class); 2235 2236 JVM_END 2237 2238 2239 // Return a new AssertionStatusDirectives object with the fields filled in with 2240 // command-line assertion arguments (i.e., -ea, -da). 2241 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2242 JVMWrapper("JVM_AssertionStatusDirectives"); 2243 JvmtiVMObjectAllocEventCollector oam; 2244 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2245 return JNIHandles::make_local(env, asd); 2246 JVM_END 2247 2248 // Verification //////////////////////////////////////////////////////////////////////////////// 2249 2250 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2251 2252 // RedefineClasses support: bug 6214132 caused verification to fail. 2253 // All functions from this section should call the jvmtiThreadSate function: 2254 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2255 // The function returns a Klass* of the _scratch_class if the verifier 2256 // was invoked in the middle of the class redefinition. 2257 // Otherwise it returns its argument value which is the _the_class Klass*. 2258 // Please, refer to the description in the jvmtiThreadSate.hpp. 2259 2260 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2261 JVMWrapper("JVM_GetClassNameUTF"); 2262 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2263 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2264 return k->name()->as_utf8(); 2265 JVM_END 2266 2267 2268 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2269 JVMWrapper("JVM_GetClassCPTypes"); 2270 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2271 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2272 // types will have length zero if this is not an InstanceKlass 2273 // (length is determined by call to JVM_GetClassCPEntriesCount) 2274 if (k->is_instance_klass()) { 2275 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2276 for (int index = cp->length() - 1; index >= 0; index--) { 2277 constantTag tag = cp->tag_at(index); 2278 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2279 } 2280 } 2281 JVM_END 2282 2283 2284 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2285 JVMWrapper("JVM_GetClassCPEntriesCount"); 2286 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2287 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2288 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2289 JVM_END 2290 2291 2292 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2293 JVMWrapper("JVM_GetClassFieldsCount"); 2294 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2295 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2296 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2297 JVM_END 2298 2299 2300 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2301 JVMWrapper("JVM_GetClassMethodsCount"); 2302 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2303 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2304 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2305 JVM_END 2306 2307 2308 // The following methods, used for the verifier, are never called with 2309 // array klasses, so a direct cast to InstanceKlass is safe. 2310 // Typically, these methods are called in a loop with bounds determined 2311 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2312 // zero for arrays. 2313 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2314 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2315 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2316 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2317 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2318 int length = method->checked_exceptions_length(); 2319 if (length > 0) { 2320 CheckedExceptionElement* table= method->checked_exceptions_start(); 2321 for (int i = 0; i < length; i++) { 2322 exceptions[i] = table[i].class_cp_index; 2323 } 2324 } 2325 JVM_END 2326 2327 2328 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2329 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2330 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2331 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2332 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2333 return method->checked_exceptions_length(); 2334 JVM_END 2335 2336 2337 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2338 JVMWrapper("JVM_GetMethodIxByteCode"); 2339 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2340 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2341 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2342 memcpy(code, method->code_base(), method->code_size()); 2343 JVM_END 2344 2345 2346 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2347 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2348 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2349 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2350 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2351 return method->code_size(); 2352 JVM_END 2353 2354 2355 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2356 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2357 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2358 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2359 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2360 ExceptionTable extable(method); 2361 entry->start_pc = extable.start_pc(entry_index); 2362 entry->end_pc = extable.end_pc(entry_index); 2363 entry->handler_pc = extable.handler_pc(entry_index); 2364 entry->catchType = extable.catch_type_index(entry_index); 2365 JVM_END 2366 2367 2368 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2369 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2370 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2371 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2372 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2373 return method->exception_table_length(); 2374 JVM_END 2375 2376 2377 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2378 JVMWrapper("JVM_GetMethodIxModifiers"); 2379 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2380 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2381 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2382 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2383 JVM_END 2384 2385 2386 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2387 JVMWrapper("JVM_GetFieldIxModifiers"); 2388 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2389 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2390 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2391 JVM_END 2392 2393 2394 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2395 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2396 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2397 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2398 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2399 return method->max_locals(); 2400 JVM_END 2401 2402 2403 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2404 JVMWrapper("JVM_GetMethodIxArgsSize"); 2405 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2406 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2407 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2408 return method->size_of_parameters(); 2409 JVM_END 2410 2411 2412 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2413 JVMWrapper("JVM_GetMethodIxMaxStack"); 2414 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2415 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2416 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2417 return method->verifier_max_stack(); 2418 JVM_END 2419 2420 2421 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2422 JVMWrapper("JVM_IsConstructorIx"); 2423 ResourceMark rm(THREAD); 2424 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2425 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2426 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2427 return method->name() == vmSymbols::object_initializer_name(); 2428 JVM_END 2429 2430 2431 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2432 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2433 ResourceMark rm(THREAD); 2434 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2435 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2436 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2437 return method->is_overpass(); 2438 JVM_END 2439 2440 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2441 JVMWrapper("JVM_GetMethodIxIxUTF"); 2442 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2443 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2444 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2445 return method->name()->as_utf8(); 2446 JVM_END 2447 2448 2449 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2450 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2451 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2452 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2453 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2454 return method->signature()->as_utf8(); 2455 JVM_END 2456 2457 /** 2458 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2459 * read entries in the constant pool. Since the old verifier always 2460 * works on a copy of the code, it will not see any rewriting that 2461 * may possibly occur in the middle of verification. So it is important 2462 * that nothing it calls tries to use the cpCache instead of the raw 2463 * constant pool, so we must use cp->uncached_x methods when appropriate. 2464 */ 2465 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2466 JVMWrapper("JVM_GetCPFieldNameUTF"); 2467 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2468 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2469 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2470 switch (cp->tag_at(cp_index).value()) { 2471 case JVM_CONSTANT_Fieldref: 2472 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2473 default: 2474 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2475 } 2476 ShouldNotReachHere(); 2477 return NULL; 2478 JVM_END 2479 2480 2481 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2482 JVMWrapper("JVM_GetCPMethodNameUTF"); 2483 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2484 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2485 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2486 switch (cp->tag_at(cp_index).value()) { 2487 case JVM_CONSTANT_InterfaceMethodref: 2488 case JVM_CONSTANT_Methodref: 2489 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2490 default: 2491 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2492 } 2493 ShouldNotReachHere(); 2494 return NULL; 2495 JVM_END 2496 2497 2498 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2499 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2500 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2501 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2502 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2503 switch (cp->tag_at(cp_index).value()) { 2504 case JVM_CONSTANT_InterfaceMethodref: 2505 case JVM_CONSTANT_Methodref: 2506 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2507 default: 2508 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2509 } 2510 ShouldNotReachHere(); 2511 return NULL; 2512 JVM_END 2513 2514 2515 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2516 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2517 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2518 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2519 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2520 switch (cp->tag_at(cp_index).value()) { 2521 case JVM_CONSTANT_Fieldref: 2522 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2523 default: 2524 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2525 } 2526 ShouldNotReachHere(); 2527 return NULL; 2528 JVM_END 2529 2530 2531 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2532 JVMWrapper("JVM_GetCPClassNameUTF"); 2533 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2534 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2535 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2536 Symbol* classname = cp->klass_name_at(cp_index); 2537 return classname->as_utf8(); 2538 JVM_END 2539 2540 2541 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2542 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2544 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2545 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2546 switch (cp->tag_at(cp_index).value()) { 2547 case JVM_CONSTANT_Fieldref: { 2548 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2549 Symbol* classname = cp->klass_name_at(class_index); 2550 return classname->as_utf8(); 2551 } 2552 default: 2553 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2554 } 2555 ShouldNotReachHere(); 2556 return NULL; 2557 JVM_END 2558 2559 2560 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2561 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2562 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2563 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2564 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2565 switch (cp->tag_at(cp_index).value()) { 2566 case JVM_CONSTANT_Methodref: 2567 case JVM_CONSTANT_InterfaceMethodref: { 2568 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2569 Symbol* classname = cp->klass_name_at(class_index); 2570 return classname->as_utf8(); 2571 } 2572 default: 2573 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2574 } 2575 ShouldNotReachHere(); 2576 return NULL; 2577 JVM_END 2578 2579 2580 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2581 JVMWrapper("JVM_GetCPFieldModifiers"); 2582 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2583 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2584 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2585 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2586 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2587 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2588 switch (cp->tag_at(cp_index).value()) { 2589 case JVM_CONSTANT_Fieldref: { 2590 Symbol* name = cp->uncached_name_ref_at(cp_index); 2591 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2592 InstanceKlass* ik = InstanceKlass::cast(k_called); 2593 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2594 if (fs.name() == name && fs.signature() == signature) { 2595 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2596 } 2597 } 2598 return -1; 2599 } 2600 default: 2601 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2602 } 2603 ShouldNotReachHere(); 2604 return 0; 2605 JVM_END 2606 2607 2608 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2609 JVMWrapper("JVM_GetCPMethodModifiers"); 2610 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2611 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2612 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2613 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2614 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2615 switch (cp->tag_at(cp_index).value()) { 2616 case JVM_CONSTANT_Methodref: 2617 case JVM_CONSTANT_InterfaceMethodref: { 2618 Symbol* name = cp->uncached_name_ref_at(cp_index); 2619 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2620 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2621 int methods_count = methods->length(); 2622 for (int i = 0; i < methods_count; i++) { 2623 Method* method = methods->at(i); 2624 if (method->name() == name && method->signature() == signature) { 2625 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2626 } 2627 } 2628 return -1; 2629 } 2630 default: 2631 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2632 } 2633 ShouldNotReachHere(); 2634 return 0; 2635 JVM_END 2636 2637 2638 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2639 2640 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2641 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2642 JVM_END 2643 2644 2645 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2646 JVMWrapper("JVM_IsSameClassPackage"); 2647 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2648 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2649 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2650 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2651 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2652 JVM_END 2653 2654 // Printing support ////////////////////////////////////////////////// 2655 extern "C" { 2656 2657 ATTRIBUTE_PRINTF(3, 0) 2658 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2659 // Reject count values that are negative signed values converted to 2660 // unsigned; see bug 4399518, 4417214 2661 if ((intptr_t)count <= 0) return -1; 2662 2663 int result = os::vsnprintf(str, count, fmt, args); 2664 if (result > 0 && (size_t)result >= count) { 2665 result = -1; 2666 } 2667 2668 return result; 2669 } 2670 2671 ATTRIBUTE_PRINTF(3, 4) 2672 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2673 va_list args; 2674 int len; 2675 va_start(args, fmt); 2676 len = jio_vsnprintf(str, count, fmt, args); 2677 va_end(args); 2678 return len; 2679 } 2680 2681 ATTRIBUTE_PRINTF(2, 3) 2682 int jio_fprintf(FILE* f, const char *fmt, ...) { 2683 int len; 2684 va_list args; 2685 va_start(args, fmt); 2686 len = jio_vfprintf(f, fmt, args); 2687 va_end(args); 2688 return len; 2689 } 2690 2691 ATTRIBUTE_PRINTF(2, 0) 2692 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2693 if (Arguments::vfprintf_hook() != NULL) { 2694 return Arguments::vfprintf_hook()(f, fmt, args); 2695 } else { 2696 return vfprintf(f, fmt, args); 2697 } 2698 } 2699 2700 ATTRIBUTE_PRINTF(1, 2) 2701 JNIEXPORT int jio_printf(const char *fmt, ...) { 2702 int len; 2703 va_list args; 2704 va_start(args, fmt); 2705 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2706 va_end(args); 2707 return len; 2708 } 2709 2710 // HotSpot specific jio method 2711 void jio_print(const char* s, size_t len) { 2712 // Try to make this function as atomic as possible. 2713 if (Arguments::vfprintf_hook() != NULL) { 2714 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2715 } else { 2716 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2717 size_t count = ::write(defaultStream::output_fd(), s, (int)len); 2718 } 2719 } 2720 2721 } // Extern C 2722 2723 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2724 2725 // In most of the JVM thread support functions we need to access the 2726 // thread through a ThreadsListHandle to prevent it from exiting and 2727 // being reclaimed while we try to operate on it. The exceptions to this 2728 // rule are when operating on the current thread, or if the monitor of 2729 // the target java.lang.Thread is locked at the Java level - in both 2730 // cases the target cannot exit. 2731 2732 static void thread_entry(JavaThread* thread, TRAPS) { 2733 HandleMark hm(THREAD); 2734 Handle obj(THREAD, thread->threadObj()); 2735 JavaValue result(T_VOID); 2736 JavaCalls::call_virtual(&result, 2737 obj, 2738 SystemDictionary::Thread_klass(), 2739 vmSymbols::run_method_name(), 2740 vmSymbols::void_method_signature(), 2741 THREAD); 2742 } 2743 2744 2745 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2746 JVMWrapper("JVM_StartThread"); 2747 JavaThread *native_thread = NULL; 2748 2749 // We cannot hold the Threads_lock when we throw an exception, 2750 // due to rank ordering issues. Example: we might need to grab the 2751 // Heap_lock while we construct the exception. 2752 bool throw_illegal_thread_state = false; 2753 2754 // We must release the Threads_lock before we can post a jvmti event 2755 // in Thread::start. 2756 { 2757 // Ensure that the C++ Thread and OSThread structures aren't freed before 2758 // we operate. 2759 MutexLocker mu(Threads_lock); 2760 2761 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2762 // re-starting an already started thread, so we should usually find 2763 // that the JavaThread is null. However for a JNI attached thread 2764 // there is a small window between the Thread object being created 2765 // (with its JavaThread set) and the update to its threadStatus, so we 2766 // have to check for this 2767 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2768 throw_illegal_thread_state = true; 2769 } else { 2770 // We could also check the stillborn flag to see if this thread was already stopped, but 2771 // for historical reasons we let the thread detect that itself when it starts running 2772 2773 jlong size = 2774 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2775 // Allocate the C++ Thread structure and create the native thread. The 2776 // stack size retrieved from java is 64-bit signed, but the constructor takes 2777 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2778 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2779 // - Avoid passing negative values which would result in really large stacks. 2780 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2781 size_t sz = size > 0 ? (size_t) size : 0; 2782 native_thread = new JavaThread(&thread_entry, sz); 2783 2784 // At this point it may be possible that no osthread was created for the 2785 // JavaThread due to lack of memory. Check for this situation and throw 2786 // an exception if necessary. Eventually we may want to change this so 2787 // that we only grab the lock if the thread was created successfully - 2788 // then we can also do this check and throw the exception in the 2789 // JavaThread constructor. 2790 if (native_thread->osthread() != NULL) { 2791 // Note: the current thread is not being used within "prepare". 2792 native_thread->prepare(jthread); 2793 } 2794 } 2795 } 2796 2797 if (throw_illegal_thread_state) { 2798 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2799 } 2800 2801 assert(native_thread != NULL, "Starting null thread?"); 2802 2803 if (native_thread->osthread() == NULL) { 2804 // No one should hold a reference to the 'native_thread'. 2805 native_thread->smr_delete(); 2806 if (JvmtiExport::should_post_resource_exhausted()) { 2807 JvmtiExport::post_resource_exhausted( 2808 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2809 os::native_thread_creation_failed_msg()); 2810 } 2811 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2812 os::native_thread_creation_failed_msg()); 2813 } 2814 2815 Thread::start(native_thread); 2816 2817 JVM_END 2818 2819 2820 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2821 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2822 // but is thought to be reliable and simple. In the case, where the receiver is the 2823 // same thread as the sender, no VM_Operation is needed. 2824 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2825 JVMWrapper("JVM_StopThread"); 2826 2827 // A nested ThreadsListHandle will grab the Threads_lock so create 2828 // tlh before we resolve throwable. 2829 ThreadsListHandle tlh(thread); 2830 oop java_throwable = JNIHandles::resolve(throwable); 2831 if (java_throwable == NULL) { 2832 THROW(vmSymbols::java_lang_NullPointerException()); 2833 } 2834 oop java_thread = NULL; 2835 JavaThread* receiver = NULL; 2836 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2837 Events::log_exception(thread, 2838 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2839 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2840 2841 if (is_alive) { 2842 // jthread refers to a live JavaThread. 2843 if (thread == receiver) { 2844 // Exception is getting thrown at self so no VM_Operation needed. 2845 THROW_OOP(java_throwable); 2846 } else { 2847 // Use a VM_Operation to throw the exception. 2848 Thread::send_async_exception(java_thread, java_throwable); 2849 } 2850 } else { 2851 // Either: 2852 // - target thread has not been started before being stopped, or 2853 // - target thread already terminated 2854 // We could read the threadStatus to determine which case it is 2855 // but that is overkill as it doesn't matter. We must set the 2856 // stillborn flag for the first case, and if the thread has already 2857 // exited setting this flag has no effect. 2858 java_lang_Thread::set_stillborn(java_thread); 2859 } 2860 JVM_END 2861 2862 2863 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2864 JVMWrapper("JVM_IsThreadAlive"); 2865 2866 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2867 return java_lang_Thread::is_alive(thread_oop); 2868 JVM_END 2869 2870 2871 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2872 JVMWrapper("JVM_SuspendThread"); 2873 2874 ThreadsListHandle tlh(thread); 2875 JavaThread* receiver = NULL; 2876 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2877 if (is_alive) { 2878 // jthread refers to a live JavaThread. 2879 { 2880 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2881 if (receiver->is_external_suspend()) { 2882 // Don't allow nested external suspend requests. We can't return 2883 // an error from this interface so just ignore the problem. 2884 return; 2885 } 2886 if (receiver->is_exiting()) { // thread is in the process of exiting 2887 return; 2888 } 2889 receiver->set_external_suspend(); 2890 } 2891 2892 // java_suspend() will catch threads in the process of exiting 2893 // and will ignore them. 2894 receiver->java_suspend(); 2895 2896 // It would be nice to have the following assertion in all the 2897 // time, but it is possible for a racing resume request to have 2898 // resumed this thread right after we suspended it. Temporarily 2899 // enable this assertion if you are chasing a different kind of 2900 // bug. 2901 // 2902 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2903 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2904 } 2905 JVM_END 2906 2907 2908 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2909 JVMWrapper("JVM_ResumeThread"); 2910 2911 ThreadsListHandle tlh(thread); 2912 JavaThread* receiver = NULL; 2913 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2914 if (is_alive) { 2915 // jthread refers to a live JavaThread. 2916 2917 // This is the original comment for this Threads_lock grab: 2918 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2919 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2920 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2921 // looks at it. 2922 // 2923 // The above comment dates back to when we had both internal and 2924 // external suspend APIs that shared a common underlying mechanism. 2925 // External suspend is now entirely cooperative and doesn't share 2926 // anything with internal suspend. That said, there are some 2927 // assumptions in the VM that an external resume grabs the 2928 // Threads_lock. We can't drop the Threads_lock grab here until we 2929 // resolve the assumptions that exist elsewhere. 2930 // 2931 MutexLocker ml(Threads_lock); 2932 receiver->java_resume(); 2933 } 2934 JVM_END 2935 2936 2937 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2938 JVMWrapper("JVM_SetThreadPriority"); 2939 2940 ThreadsListHandle tlh(thread); 2941 oop java_thread = NULL; 2942 JavaThread* receiver = NULL; 2943 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2944 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2945 2946 if (is_alive) { 2947 // jthread refers to a live JavaThread. 2948 Thread::set_priority(receiver, (ThreadPriority)prio); 2949 } 2950 // Implied else: If the JavaThread hasn't started yet, then the 2951 // priority set in the java.lang.Thread object above will be pushed 2952 // down when it does start. 2953 JVM_END 2954 2955 2956 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2957 JVMWrapper("JVM_Yield"); 2958 if (os::dont_yield()) return; 2959 HOTSPOT_THREAD_YIELD(); 2960 os::naked_yield(); 2961 JVM_END 2962 2963 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) { 2964 assert(event != NULL, "invariant"); 2965 assert(event->should_commit(), "invariant"); 2966 event->set_time(millis); 2967 event->commit(); 2968 } 2969 2970 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2971 JVMWrapper("JVM_Sleep"); 2972 2973 if (millis < 0) { 2974 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2975 } 2976 2977 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2978 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2979 } 2980 2981 // Save current thread state and restore it at the end of this block. 2982 // And set new thread state to SLEEPING. 2983 JavaThreadSleepState jtss(thread); 2984 2985 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 2986 EventThreadSleep event; 2987 2988 if (millis == 0) { 2989 os::naked_yield(); 2990 } else { 2991 ThreadState old_state = thread->osthread()->get_state(); 2992 thread->osthread()->set_state(SLEEPING); 2993 if (os::sleep(thread, millis, true) == OS_INTRPT) { 2994 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 2995 // us while we were sleeping. We do not overwrite those. 2996 if (!HAS_PENDING_EXCEPTION) { 2997 if (event.should_commit()) { 2998 post_thread_sleep_event(&event, millis); 2999 } 3000 HOTSPOT_THREAD_SLEEP_END(1); 3001 3002 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3003 // to properly restore the thread state. That's likely wrong. 3004 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3005 } 3006 } 3007 thread->osthread()->set_state(old_state); 3008 } 3009 if (event.should_commit()) { 3010 post_thread_sleep_event(&event, millis); 3011 } 3012 HOTSPOT_THREAD_SLEEP_END(0); 3013 JVM_END 3014 3015 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3016 JVMWrapper("JVM_CurrentThread"); 3017 oop jthread = thread->threadObj(); 3018 assert (thread != NULL, "no current thread!"); 3019 return JNIHandles::make_local(env, jthread); 3020 JVM_END 3021 3022 3023 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3024 JVMWrapper("JVM_CountStackFrames"); 3025 3026 uint32_t debug_bits = 0; 3027 ThreadsListHandle tlh(thread); 3028 JavaThread* receiver = NULL; 3029 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3030 int count = 0; 3031 if (is_alive) { 3032 // jthread refers to a live JavaThread. 3033 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) { 3034 // Count all java activation, i.e., number of vframes. 3035 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) { 3036 // Native frames are not counted. 3037 if (!vfst.method()->is_native()) count++; 3038 } 3039 } else { 3040 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3041 "this thread is not suspended"); 3042 } 3043 } 3044 // Implied else: if JavaThread is not alive simply return a count of 0. 3045 3046 return count; 3047 JVM_END 3048 3049 3050 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3051 JVMWrapper("JVM_Interrupt"); 3052 3053 ThreadsListHandle tlh(thread); 3054 JavaThread* receiver = NULL; 3055 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3056 if (is_alive) { 3057 // jthread refers to a live JavaThread. 3058 Thread::interrupt(receiver); 3059 } 3060 JVM_END 3061 3062 3063 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3064 JVMWrapper("JVM_IsInterrupted"); 3065 3066 ThreadsListHandle tlh(thread); 3067 JavaThread* receiver = NULL; 3068 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3069 if (is_alive) { 3070 // jthread refers to a live JavaThread. 3071 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0); 3072 } else { 3073 return JNI_FALSE; 3074 } 3075 JVM_END 3076 3077 3078 // Return true iff the current thread has locked the object passed in 3079 3080 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3081 JVMWrapper("JVM_HoldsLock"); 3082 assert(THREAD->is_Java_thread(), "sanity check"); 3083 if (obj == NULL) { 3084 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3085 } 3086 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3087 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3088 JVM_END 3089 3090 3091 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3092 JVMWrapper("JVM_DumpAllStacks"); 3093 VM_PrintThreads op; 3094 VMThread::execute(&op); 3095 if (JvmtiExport::should_post_data_dump()) { 3096 JvmtiExport::post_data_dump(); 3097 } 3098 JVM_END 3099 3100 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3101 JVMWrapper("JVM_SetNativeThreadName"); 3102 3103 // We don't use a ThreadsListHandle here because the current thread 3104 // must be alive. 3105 oop java_thread = JNIHandles::resolve_non_null(jthread); 3106 JavaThread* thr = java_lang_Thread::thread(java_thread); 3107 if (thread == thr && !thr->has_attached_via_jni()) { 3108 // Thread naming is only supported for the current thread and 3109 // we don't set the name of an attached thread to avoid stepping 3110 // on other programs. 3111 ResourceMark rm(thread); 3112 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3113 os::set_native_thread_name(thread_name); 3114 } 3115 JVM_END 3116 3117 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3118 3119 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3120 JVMWrapper("JVM_GetClassContext"); 3121 ResourceMark rm(THREAD); 3122 JvmtiVMObjectAllocEventCollector oam; 3123 vframeStream vfst(thread); 3124 3125 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3126 // This must only be called from SecurityManager.getClassContext 3127 Method* m = vfst.method(); 3128 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3129 m->name() == vmSymbols::getClassContext_name() && 3130 m->signature() == vmSymbols::void_class_array_signature())) { 3131 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3132 } 3133 } 3134 3135 // Collect method holders 3136 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3137 for (; !vfst.at_end(); vfst.security_next()) { 3138 Method* m = vfst.method(); 3139 // Native frames are not returned 3140 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3141 Klass* holder = m->method_holder(); 3142 assert(holder->is_klass(), "just checking"); 3143 klass_array->append(holder); 3144 } 3145 } 3146 3147 // Create result array of type [Ljava/lang/Class; 3148 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3149 // Fill in mirrors corresponding to method holders 3150 for (int i = 0; i < klass_array->length(); i++) { 3151 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3152 } 3153 3154 return (jobjectArray) JNIHandles::make_local(env, result); 3155 JVM_END 3156 3157 3158 // java.lang.Package //////////////////////////////////////////////////////////////// 3159 3160 3161 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3162 JVMWrapper("JVM_GetSystemPackage"); 3163 ResourceMark rm(THREAD); 3164 JvmtiVMObjectAllocEventCollector oam; 3165 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3166 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3167 return (jstring) JNIHandles::make_local(result); 3168 JVM_END 3169 3170 3171 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3172 JVMWrapper("JVM_GetSystemPackages"); 3173 JvmtiVMObjectAllocEventCollector oam; 3174 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3175 return (jobjectArray) JNIHandles::make_local(result); 3176 JVM_END 3177 3178 3179 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3180 3181 3182 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3183 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3184 3185 MonitorLockerEx ml(Heap_lock); 3186 oop ref = Universe::reference_pending_list(); 3187 if (ref != NULL) { 3188 Universe::set_reference_pending_list(NULL); 3189 } 3190 return JNIHandles::make_local(env, ref); 3191 JVM_END 3192 3193 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3194 JVMWrapper("JVM_HasReferencePendingList"); 3195 MonitorLockerEx ml(Heap_lock); 3196 return Universe::has_reference_pending_list(); 3197 JVM_END 3198 3199 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3200 JVMWrapper("JVM_WaitForReferencePendingList"); 3201 MonitorLockerEx ml(Heap_lock); 3202 while (!Universe::has_reference_pending_list()) { 3203 ml.wait(); 3204 } 3205 JVM_END 3206 3207 3208 // ObjectInputStream /////////////////////////////////////////////////////////////// 3209 3210 // Return the first user-defined class loader up the execution stack, or null 3211 // if only code from the bootstrap or platform class loader is on the stack. 3212 3213 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3214 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3215 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3216 oop loader = vfst.method()->method_holder()->class_loader(); 3217 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3218 return JNIHandles::make_local(env, loader); 3219 } 3220 } 3221 return NULL; 3222 JVM_END 3223 3224 3225 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3226 3227 3228 // resolve array handle and check arguments 3229 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3230 if (arr == NULL) { 3231 THROW_0(vmSymbols::java_lang_NullPointerException()); 3232 } 3233 oop a = JNIHandles::resolve_non_null(arr); 3234 if (!a->is_array()) { 3235 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3236 } else if (type_array_only && !a->is_typeArray()) { 3237 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3238 } 3239 return arrayOop(a); 3240 } 3241 3242 3243 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3244 JVMWrapper("JVM_GetArrayLength"); 3245 arrayOop a = check_array(env, arr, false, CHECK_0); 3246 return a->length(); 3247 JVM_END 3248 3249 3250 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3251 JVMWrapper("JVM_Array_Get"); 3252 JvmtiVMObjectAllocEventCollector oam; 3253 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3254 jvalue value; 3255 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3256 oop box = Reflection::box(&value, type, CHECK_NULL); 3257 return JNIHandles::make_local(env, box); 3258 JVM_END 3259 3260 3261 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3262 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3263 jvalue value; 3264 value.i = 0; // to initialize value before getting used in CHECK 3265 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3266 assert(a->is_typeArray(), "just checking"); 3267 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3268 BasicType wide_type = (BasicType) wCode; 3269 if (type != wide_type) { 3270 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3271 } 3272 return value; 3273 JVM_END 3274 3275 3276 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3277 JVMWrapper("JVM_SetArrayElement"); 3278 arrayOop a = check_array(env, arr, false, CHECK); 3279 oop box = JNIHandles::resolve(val); 3280 jvalue value; 3281 value.i = 0; // to initialize value before getting used in CHECK 3282 BasicType value_type; 3283 if (a->is_objArray()) { 3284 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3285 value_type = Reflection::unbox_for_regular_object(box, &value); 3286 } else { 3287 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3288 } 3289 Reflection::array_set(&value, a, index, value_type, CHECK); 3290 JVM_END 3291 3292 3293 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3294 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3295 arrayOop a = check_array(env, arr, true, CHECK); 3296 assert(a->is_typeArray(), "just checking"); 3297 BasicType value_type = (BasicType) vCode; 3298 Reflection::array_set(&v, a, index, value_type, CHECK); 3299 JVM_END 3300 3301 3302 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3303 JVMWrapper("JVM_NewArray"); 3304 JvmtiVMObjectAllocEventCollector oam; 3305 oop element_mirror = JNIHandles::resolve(eltClass); 3306 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3307 return JNIHandles::make_local(env, result); 3308 JVM_END 3309 3310 3311 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3312 JVMWrapper("JVM_NewMultiArray"); 3313 JvmtiVMObjectAllocEventCollector oam; 3314 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3315 oop element_mirror = JNIHandles::resolve(eltClass); 3316 assert(dim_array->is_typeArray(), "just checking"); 3317 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3318 return JNIHandles::make_local(env, result); 3319 JVM_END 3320 3321 3322 // Library support /////////////////////////////////////////////////////////////////////////// 3323 3324 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3325 //%note jvm_ct 3326 JVMWrapper("JVM_LoadLibrary"); 3327 char ebuf[1024]; 3328 void *load_result; 3329 { 3330 ThreadToNativeFromVM ttnfvm(thread); 3331 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3332 } 3333 if (load_result == NULL) { 3334 char msg[1024]; 3335 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3336 // Since 'ebuf' may contain a string encoded using 3337 // platform encoding scheme, we need to pass 3338 // Exceptions::unsafe_to_utf8 to the new_exception method 3339 // as the last argument. See bug 6367357. 3340 Handle h_exception = 3341 Exceptions::new_exception(thread, 3342 vmSymbols::java_lang_UnsatisfiedLinkError(), 3343 msg, Exceptions::unsafe_to_utf8); 3344 3345 THROW_HANDLE_0(h_exception); 3346 } 3347 return load_result; 3348 JVM_END 3349 3350 3351 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3352 JVMWrapper("JVM_UnloadLibrary"); 3353 os::dll_unload(handle); 3354 JVM_END 3355 3356 3357 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3358 JVMWrapper("JVM_FindLibraryEntry"); 3359 return os::dll_lookup(handle, name); 3360 JVM_END 3361 3362 3363 // JNI version /////////////////////////////////////////////////////////////////////////////// 3364 3365 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3366 JVMWrapper("JVM_IsSupportedJNIVersion"); 3367 return Threads::is_supported_jni_version_including_1_1(version); 3368 JVM_END 3369 3370 3371 // String support /////////////////////////////////////////////////////////////////////////// 3372 3373 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3374 JVMWrapper("JVM_InternString"); 3375 JvmtiVMObjectAllocEventCollector oam; 3376 if (str == NULL) return NULL; 3377 oop string = JNIHandles::resolve_non_null(str); 3378 oop result = StringTable::intern(string, CHECK_NULL); 3379 return (jstring) JNIHandles::make_local(env, result); 3380 JVM_END 3381 3382 3383 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3384 3385 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3386 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3387 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3388 // that only works with java threads. 3389 3390 3391 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3392 VM_Exit::block_if_vm_exited(); 3393 JVMWrapper("JVM_RawMonitorCreate"); 3394 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3395 } 3396 3397 3398 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3399 VM_Exit::block_if_vm_exited(); 3400 JVMWrapper("JVM_RawMonitorDestroy"); 3401 delete ((Mutex*) mon); 3402 } 3403 3404 3405 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3406 VM_Exit::block_if_vm_exited(); 3407 JVMWrapper("JVM_RawMonitorEnter"); 3408 ((Mutex*) mon)->jvm_raw_lock(); 3409 return 0; 3410 } 3411 3412 3413 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3414 VM_Exit::block_if_vm_exited(); 3415 JVMWrapper("JVM_RawMonitorExit"); 3416 ((Mutex*) mon)->jvm_raw_unlock(); 3417 } 3418 3419 3420 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3421 3422 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3423 Handle loader, Handle protection_domain, 3424 jboolean throwError, TRAPS) { 3425 // Security Note: 3426 // The Java level wrapper will perform the necessary security check allowing 3427 // us to pass the NULL as the initiating class loader. The VM is responsible for 3428 // the checkPackageAccess relative to the initiating class loader via the 3429 // protection_domain. The protection_domain is passed as NULL by the java code 3430 // if there is no security manager in 3-arg Class.forName(). 3431 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3432 3433 // Check if we should initialize the class 3434 if (init && klass->is_instance_klass()) { 3435 klass->initialize(CHECK_NULL); 3436 } 3437 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3438 } 3439 3440 3441 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3442 3443 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3444 JVMWrapper("JVM_InvokeMethod"); 3445 Handle method_handle; 3446 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3447 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3448 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3449 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3450 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3451 jobject res = JNIHandles::make_local(env, result); 3452 if (JvmtiExport::should_post_vm_object_alloc()) { 3453 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3454 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3455 if (java_lang_Class::is_primitive(ret_type)) { 3456 // Only for primitive type vm allocates memory for java object. 3457 // See box() method. 3458 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3459 } 3460 } 3461 return res; 3462 } else { 3463 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3464 } 3465 JVM_END 3466 3467 3468 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3469 JVMWrapper("JVM_NewInstanceFromConstructor"); 3470 oop constructor_mirror = JNIHandles::resolve(c); 3471 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3472 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3473 jobject res = JNIHandles::make_local(env, result); 3474 if (JvmtiExport::should_post_vm_object_alloc()) { 3475 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3476 } 3477 return res; 3478 JVM_END 3479 3480 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3481 3482 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3483 JVMWrapper("JVM_SupportsCX8"); 3484 return VM_Version::supports_cx8(); 3485 JVM_END 3486 3487 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3488 JVMWrapper("JVM_InitializeFromArchive"); 3489 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3490 assert(k->is_klass(), "just checking"); 3491 HeapShared::initialize_from_archived_subgraph(k); 3492 JVM_END 3493 3494 // Returns an array of all live Thread objects (VM internal JavaThreads, 3495 // jvmti agent threads, and JNI attaching threads are skipped) 3496 // See CR 6404306 regarding JNI attaching threads 3497 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3498 ResourceMark rm(THREAD); 3499 ThreadsListEnumerator tle(THREAD, false, false); 3500 JvmtiVMObjectAllocEventCollector oam; 3501 3502 int num_threads = tle.num_threads(); 3503 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3504 objArrayHandle threads_ah(THREAD, r); 3505 3506 for (int i = 0; i < num_threads; i++) { 3507 Handle h = tle.get_threadObj(i); 3508 threads_ah->obj_at_put(i, h()); 3509 } 3510 3511 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3512 JVM_END 3513 3514 3515 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3516 // Return StackTraceElement[][], each element is the stack trace of a thread in 3517 // the corresponding entry in the given threads array 3518 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3519 JVMWrapper("JVM_DumpThreads"); 3520 JvmtiVMObjectAllocEventCollector oam; 3521 3522 // Check if threads is null 3523 if (threads == NULL) { 3524 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3525 } 3526 3527 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3528 objArrayHandle ah(THREAD, a); 3529 int num_threads = ah->length(); 3530 // check if threads is non-empty array 3531 if (num_threads == 0) { 3532 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3533 } 3534 3535 // check if threads is not an array of objects of Thread class 3536 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3537 if (k != SystemDictionary::Thread_klass()) { 3538 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3539 } 3540 3541 ResourceMark rm(THREAD); 3542 3543 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3544 for (int i = 0; i < num_threads; i++) { 3545 oop thread_obj = ah->obj_at(i); 3546 instanceHandle h(THREAD, (instanceOop) thread_obj); 3547 thread_handle_array->append(h); 3548 } 3549 3550 // The JavaThread references in thread_handle_array are validated 3551 // in VM_ThreadDump::doit(). 3552 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3553 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3554 3555 JVM_END 3556 3557 // JVM monitoring and management support 3558 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3559 return Management::get_jmm_interface(version); 3560 JVM_END 3561 3562 // com.sun.tools.attach.VirtualMachine agent properties support 3563 // 3564 // Initialize the agent properties with the properties maintained in the VM 3565 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3566 JVMWrapper("JVM_InitAgentProperties"); 3567 ResourceMark rm; 3568 3569 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3570 3571 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3572 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3573 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3574 return properties; 3575 JVM_END 3576 3577 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3578 { 3579 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3580 JvmtiVMObjectAllocEventCollector oam; 3581 3582 if (ofClass == NULL) { 3583 return NULL; 3584 } 3585 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3586 // Special handling for primitive objects 3587 if (java_lang_Class::is_primitive(mirror())) { 3588 return NULL; 3589 } 3590 Klass* k = java_lang_Class::as_Klass(mirror()); 3591 if (!k->is_instance_klass()) { 3592 return NULL; 3593 } 3594 InstanceKlass* ik = InstanceKlass::cast(k); 3595 int encl_method_class_idx = ik->enclosing_method_class_index(); 3596 if (encl_method_class_idx == 0) { 3597 return NULL; 3598 } 3599 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3600 objArrayHandle dest(THREAD, dest_o); 3601 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3602 dest->obj_at_put(0, enc_k->java_mirror()); 3603 int encl_method_method_idx = ik->enclosing_method_method_index(); 3604 if (encl_method_method_idx != 0) { 3605 Symbol* sym = ik->constants()->symbol_at( 3606 extract_low_short_from_int( 3607 ik->constants()->name_and_type_at(encl_method_method_idx))); 3608 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3609 dest->obj_at_put(1, str()); 3610 sym = ik->constants()->symbol_at( 3611 extract_high_short_from_int( 3612 ik->constants()->name_and_type_at(encl_method_method_idx))); 3613 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3614 dest->obj_at_put(2, str()); 3615 } 3616 return (jobjectArray) JNIHandles::make_local(dest()); 3617 } 3618 JVM_END 3619 3620 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3621 { 3622 memset(info, 0, info_size); 3623 3624 info->jvm_version = VM_Version::jvm_version(); 3625 info->patch_version = VM_Version::vm_patch_version(); 3626 3627 // when we add a new capability in the jvm_version_info struct, we should also 3628 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3629 // counter defined in runtimeService.cpp. 3630 info->is_attach_supported = AttachListener::is_attach_supported(); 3631 } 3632 JVM_END 3633 3634 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3635 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3636 ResourceMark rm(THREAD); 3637 3638 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3639 return NULL; 3640 } 3641 3642 char** vm_flags = Arguments::jvm_flags_array(); 3643 char** vm_args = Arguments::jvm_args_array(); 3644 int num_flags = Arguments::num_jvm_flags(); 3645 int num_args = Arguments::num_jvm_args(); 3646 3647 InstanceKlass* ik = SystemDictionary::String_klass(); 3648 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3649 objArrayHandle result_h(THREAD, r); 3650 3651 int index = 0; 3652 for (int j = 0; j < num_flags; j++, index++) { 3653 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3654 result_h->obj_at_put(index, h()); 3655 } 3656 for (int i = 0; i < num_args; i++, index++) { 3657 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3658 result_h->obj_at_put(index, h()); 3659 } 3660 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3661 JVM_END 3662 3663 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3664 return os::get_signal_number(name); 3665 JVM_END