1 /* 2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "classfile/classFileStream.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/javaAssertions.hpp" 31 #include "classfile/javaClasses.inline.hpp" 32 #include "classfile/moduleEntry.hpp" 33 #include "classfile/modules.hpp" 34 #include "classfile/packageEntry.hpp" 35 #include "classfile/stringTable.hpp" 36 #include "classfile/symbolTable.hpp" 37 #include "classfile/systemDictionary.hpp" 38 #include "classfile/vmSymbols.hpp" 39 #include "gc/shared/collectedHeap.inline.hpp" 40 #include "interpreter/bytecode.hpp" 41 #include "jfr/jfrEvents.hpp" 42 #include "logging/log.hpp" 43 #include "memory/heapShared.hpp" 44 #include "memory/oopFactory.hpp" 45 #include "memory/referenceType.hpp" 46 #include "memory/resourceArea.hpp" 47 #include "memory/universe.hpp" 48 #include "oops/access.inline.hpp" 49 #include "oops/constantPool.hpp" 50 #include "oops/fieldStreams.hpp" 51 #include "oops/instanceKlass.hpp" 52 #include "oops/method.hpp" 53 #include "oops/objArrayKlass.hpp" 54 #include "oops/objArrayOop.inline.hpp" 55 #include "oops/oop.inline.hpp" 56 #include "prims/jvm_misc.hpp" 57 #include "prims/jvmtiExport.hpp" 58 #include "prims/jvmtiThreadState.hpp" 59 #include "prims/nativeLookup.hpp" 60 #include "prims/stackwalk.hpp" 61 #include "runtime/arguments.hpp" 62 #include "runtime/atomic.hpp" 63 #include "runtime/handles.inline.hpp" 64 #include "runtime/init.hpp" 65 #include "runtime/interfaceSupport.inline.hpp" 66 #include "runtime/deoptimization.hpp" 67 #include "runtime/handshake.hpp" 68 #include "runtime/java.hpp" 69 #include "runtime/javaCalls.hpp" 70 #include "runtime/jfieldIDWorkaround.hpp" 71 #include "runtime/jniHandles.inline.hpp" 72 #include "runtime/orderAccess.hpp" 73 #include "runtime/os.inline.hpp" 74 #include "runtime/perfData.hpp" 75 #include "runtime/reflection.hpp" 76 #include "runtime/thread.inline.hpp" 77 #include "runtime/threadSMR.hpp" 78 #include "runtime/vframe.inline.hpp" 79 #include "runtime/vmOperations.hpp" 80 #include "runtime/vm_version.hpp" 81 #include "services/attachListener.hpp" 82 #include "services/management.hpp" 83 #include "services/threadService.hpp" 84 #include "utilities/copy.hpp" 85 #include "utilities/defaultStream.hpp" 86 #include "utilities/dtrace.hpp" 87 #include "utilities/events.hpp" 88 #include "utilities/histogram.hpp" 89 #include "utilities/macros.hpp" 90 #include "utilities/utf8.hpp" 91 #if INCLUDE_CDS 92 #include "classfile/systemDictionaryShared.hpp" 93 #endif 94 95 #include <errno.h> 96 97 /* 98 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 99 such ctors and calls MUST NOT come between an oop declaration/init and its 100 usage because if objects are move this may cause various memory stomps, bus 101 errors and segfaults. Here is a cookbook for causing so called "naked oop 102 failures": 103 104 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 105 JVMWrapper("JVM_GetClassDeclaredFields"); 106 107 // Object address to be held directly in mirror & not visible to GC 108 oop mirror = JNIHandles::resolve_non_null(ofClass); 109 110 // If this ctor can hit a safepoint, moving objects around, then 111 ComplexConstructor foo; 112 113 // Boom! mirror may point to JUNK instead of the intended object 114 (some dereference of mirror) 115 116 // Here's another call that may block for GC, making mirror stale 117 MutexLocker ml(some_lock); 118 119 // And here's an initializer that can result in a stale oop 120 // all in one step. 121 oop o = call_that_can_throw_exception(TRAPS); 122 123 124 The solution is to keep the oop declaration BELOW the ctor or function 125 call that might cause a GC, do another resolve to reassign the oop, or 126 consider use of a Handle instead of an oop so there is immunity from object 127 motion. But note that the "QUICK" entries below do not have a handlemark 128 and thus can only support use of handles passed in. 129 */ 130 131 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 132 ResourceMark rm; 133 int line_number = -1; 134 const char * source_file = NULL; 135 const char * trace = "explicit"; 136 InstanceKlass* caller = NULL; 137 JavaThread* jthread = JavaThread::current(); 138 if (jthread->has_last_Java_frame()) { 139 vframeStream vfst(jthread); 140 141 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 142 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController"); 143 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 144 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction"); 145 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 146 147 Method* last_caller = NULL; 148 149 while (!vfst.at_end()) { 150 Method* m = vfst.method(); 151 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 152 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 153 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 154 break; 155 } 156 last_caller = m; 157 vfst.next(); 158 } 159 // if this is called from Class.forName0 and that is called from Class.forName, 160 // then print the caller of Class.forName. If this is Class.loadClass, then print 161 // that caller, otherwise keep quiet since this should be picked up elsewhere. 162 bool found_it = false; 163 if (!vfst.at_end() && 164 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 165 vfst.method()->name() == vmSymbols::forName0_name()) { 166 vfst.next(); 167 if (!vfst.at_end() && 168 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 169 vfst.method()->name() == vmSymbols::forName_name()) { 170 vfst.next(); 171 found_it = true; 172 } 173 } else if (last_caller != NULL && 174 last_caller->method_holder()->name() == 175 vmSymbols::java_lang_ClassLoader() && 176 last_caller->name() == vmSymbols::loadClass_name()) { 177 found_it = true; 178 } else if (!vfst.at_end()) { 179 if (vfst.method()->is_native()) { 180 // JNI call 181 found_it = true; 182 } 183 } 184 if (found_it && !vfst.at_end()) { 185 // found the caller 186 caller = vfst.method()->method_holder(); 187 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 188 if (line_number == -1) { 189 // show method name if it's a native method 190 trace = vfst.method()->name_and_sig_as_C_string(); 191 } 192 Symbol* s = caller->source_file_name(); 193 if (s != NULL) { 194 source_file = s->as_C_string(); 195 } 196 } 197 } 198 if (caller != NULL) { 199 if (to_class != caller) { 200 const char * from = caller->external_name(); 201 const char * to = to_class->external_name(); 202 // print in a single call to reduce interleaving between threads 203 if (source_file != NULL) { 204 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 205 } else { 206 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 207 } 208 } 209 } 210 } 211 212 void trace_class_resolution(Klass* to_class) { 213 EXCEPTION_MARK; 214 trace_class_resolution_impl(to_class, THREAD); 215 if (HAS_PENDING_EXCEPTION) { 216 CLEAR_PENDING_EXCEPTION; 217 } 218 } 219 220 // Wrapper to trace JVM functions 221 222 #ifdef ASSERT 223 Histogram* JVMHistogram; 224 volatile int JVMHistogram_lock = 0; 225 226 class JVMHistogramElement : public HistogramElement { 227 public: 228 JVMHistogramElement(const char* name); 229 }; 230 231 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 232 _name = elementName; 233 uintx count = 0; 234 235 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 236 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 237 count +=1; 238 if ( (WarnOnStalledSpinLock > 0) 239 && (count % WarnOnStalledSpinLock == 0)) { 240 warning("JVMHistogram_lock seems to be stalled"); 241 } 242 } 243 } 244 245 if(JVMHistogram == NULL) 246 JVMHistogram = new Histogram("JVM Call Counts",100); 247 248 JVMHistogram->add_element(this); 249 Atomic::dec(&JVMHistogram_lock); 250 } 251 252 #define JVMCountWrapper(arg) \ 253 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 254 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 255 256 #define JVMWrapper(arg) JVMCountWrapper(arg); 257 #else 258 #define JVMWrapper(arg) 259 #endif 260 261 262 // Interface version ///////////////////////////////////////////////////////////////////// 263 264 265 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 266 return JVM_INTERFACE_VERSION; 267 JVM_END 268 269 270 // java.lang.System ////////////////////////////////////////////////////////////////////// 271 272 273 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 274 JVMWrapper("JVM_CurrentTimeMillis"); 275 return os::javaTimeMillis(); 276 JVM_END 277 278 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 279 JVMWrapper("JVM_NanoTime"); 280 return os::javaTimeNanos(); 281 JVM_END 282 283 // The function below is actually exposed by jdk.internal.misc.VM and not 284 // java.lang.System, but we choose to keep it here so that it stays next 285 // to JVM_CurrentTimeMillis and JVM_NanoTime 286 287 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 288 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 289 290 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 291 JVMWrapper("JVM_GetNanoTimeAdjustment"); 292 jlong seconds; 293 jlong nanos; 294 295 os::javaTimeSystemUTC(seconds, nanos); 296 297 // We're going to verify that the result can fit in a long. 298 // For that we need the difference in seconds between 'seconds' 299 // and 'offset_secs' to be such that: 300 // |seconds - offset_secs| < (2^63/10^9) 301 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 302 // which makes |seconds - offset_secs| < 2^33 303 // and we will prefer +/- 2^32 as the maximum acceptable diff 304 // as 2^32 has a more natural feel than 2^33... 305 // 306 // So if |seconds - offset_secs| >= 2^32 - we return a special 307 // sentinel value (-1) which the caller should take as an 308 // exception value indicating that the offset given to us is 309 // too far from range of the current time - leading to too big 310 // a nano adjustment. The caller is expected to recover by 311 // computing a more accurate offset and calling this method 312 // again. (For the record 2^32 secs is ~136 years, so that 313 // should rarely happen) 314 // 315 jlong diff = seconds - offset_secs; 316 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 317 return -1; // sentinel value: the offset is too far off the target 318 } 319 320 // return the adjustment. If you compute a time by adding 321 // this number of nanoseconds along with the number of seconds 322 // in the offset you should get the current UTC time. 323 return (diff * (jlong)1000000000) + nanos; 324 JVM_END 325 326 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 327 jobject dst, jint dst_pos, jint length)) 328 JVMWrapper("JVM_ArrayCopy"); 329 // Check if we have null pointers 330 if (src == NULL || dst == NULL) { 331 THROW(vmSymbols::java_lang_NullPointerException()); 332 } 333 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 334 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 335 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 336 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 337 // Do copy 338 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 339 JVM_END 340 341 342 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 343 JavaValue r(T_OBJECT); 344 // public synchronized Object put(Object key, Object value); 345 HandleMark hm(THREAD); 346 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 347 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 348 JavaCalls::call_virtual(&r, 349 props, 350 SystemDictionary::Properties_klass(), 351 vmSymbols::put_name(), 352 vmSymbols::object_object_object_signature(), 353 key_str, 354 value_str, 355 THREAD); 356 } 357 358 359 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 360 361 /* 362 * Return all of the system properties in a Java String array with alternating 363 * names and values from the jvm SystemProperty. 364 * Which includes some internal and all commandline -D defined properties. 365 */ 366 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 367 JVMWrapper("JVM_GetProperties"); 368 ResourceMark rm(THREAD); 369 HandleMark hm(THREAD); 370 int ndx = 0; 371 int fixedCount = 2; 372 373 SystemProperty* p = Arguments::system_properties(); 374 int count = Arguments::PropertyList_count(p); 375 376 // Allocate result String array 377 InstanceKlass* ik = SystemDictionary::String_klass(); 378 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 379 objArrayHandle result_h(THREAD, r); 380 381 while (p != NULL) { 382 const char * key = p->key(); 383 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 384 const char * value = p->value(); 385 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 386 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL); 387 result_h->obj_at_put(ndx * 2, key_str()); 388 result_h->obj_at_put(ndx * 2 + 1, value_str()); 389 ndx++; 390 } 391 p = p->next(); 392 } 393 394 // Convert the -XX:MaxDirectMemorySize= command line flag 395 // to the sun.nio.MaxDirectMemorySize property. 396 // Do this after setting user properties to prevent people 397 // from setting the value with a -D option, as requested. 398 // Leave empty if not supplied 399 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 400 char as_chars[256]; 401 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 402 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 403 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 404 result_h->obj_at_put(ndx * 2, key_str()); 405 result_h->obj_at_put(ndx * 2 + 1, value_str()); 406 ndx++; 407 } 408 409 // JVM monitoring and management support 410 // Add the sun.management.compiler property for the compiler's name 411 { 412 #undef CSIZE 413 #if defined(_LP64) || defined(_WIN64) 414 #define CSIZE "64-Bit " 415 #else 416 #define CSIZE 417 #endif // 64bit 418 419 #ifdef TIERED 420 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 421 #else 422 #if defined(COMPILER1) 423 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 424 #elif defined(COMPILER2) 425 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 426 #elif INCLUDE_JVMCI 427 #error "INCLUDE_JVMCI should imply TIERED" 428 #else 429 const char* compiler_name = ""; 430 #endif // compilers 431 #endif // TIERED 432 433 if (*compiler_name != '\0' && 434 (Arguments::mode() != Arguments::_int)) { 435 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 436 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 437 result_h->obj_at_put(ndx * 2, key_str()); 438 result_h->obj_at_put(ndx * 2 + 1, value_str()); 439 ndx++; 440 } 441 } 442 443 return (jobjectArray) JNIHandles::make_local(env, result_h()); 444 JVM_END 445 446 447 /* 448 * Return the temporary directory that the VM uses for the attach 449 * and perf data files. 450 * 451 * It is important that this directory is well-known and the 452 * same for all VM instances. It cannot be affected by configuration 453 * variables such as java.io.tmpdir. 454 */ 455 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 456 JVMWrapper("JVM_GetTemporaryDirectory"); 457 HandleMark hm(THREAD); 458 const char* temp_dir = os::get_temp_directory(); 459 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 460 return (jstring) JNIHandles::make_local(env, h()); 461 JVM_END 462 463 464 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 465 466 extern volatile jint vm_created; 467 468 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 469 JVMWrapper("JVM_BeforeHalt"); 470 EventShutdown event; 471 if (event.should_commit()) { 472 event.set_reason("Shutdown requested from Java"); 473 event.commit(); 474 } 475 JVM_END 476 477 478 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 479 before_exit(thread); 480 vm_exit(code); 481 JVM_END 482 483 484 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 485 JVMWrapper("JVM_GC"); 486 if (!DisableExplicitGC) { 487 Universe::heap()->collect(GCCause::_java_lang_system_gc); 488 } 489 JVM_END 490 491 492 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 493 JVMWrapper("JVM_MaxObjectInspectionAge"); 494 return Universe::heap()->millis_since_last_gc(); 495 JVM_END 496 497 498 static inline jlong convert_size_t_to_jlong(size_t val) { 499 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 500 NOT_LP64 (return (jlong)val;) 501 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 502 } 503 504 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 505 JVMWrapper("JVM_TotalMemory"); 506 size_t n = Universe::heap()->capacity(); 507 return convert_size_t_to_jlong(n); 508 JVM_END 509 510 511 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 512 JVMWrapper("JVM_FreeMemory"); 513 size_t n = Universe::heap()->unused(); 514 return convert_size_t_to_jlong(n); 515 JVM_END 516 517 518 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 519 JVMWrapper("JVM_MaxMemory"); 520 size_t n = Universe::heap()->max_capacity(); 521 return convert_size_t_to_jlong(n); 522 JVM_END 523 524 525 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 526 JVMWrapper("JVM_ActiveProcessorCount"); 527 return os::active_processor_count(); 528 JVM_END 529 530 531 532 // java.lang.Throwable ////////////////////////////////////////////////////// 533 534 535 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 536 JVMWrapper("JVM_FillInStackTrace"); 537 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 538 java_lang_Throwable::fill_in_stack_trace(exception); 539 JVM_END 540 541 542 // java.lang.StackTraceElement ////////////////////////////////////////////// 543 544 545 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 546 JVMWrapper("JVM_InitStackTraceElementArray"); 547 Handle exception(THREAD, JNIHandles::resolve(throwable)); 548 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 549 objArrayHandle stack_trace(THREAD, st); 550 // Fill in the allocated stack trace 551 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 552 JVM_END 553 554 555 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 556 JVMWrapper("JVM_InitStackTraceElement"); 557 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 558 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 559 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 560 JVM_END 561 562 563 // java.lang.StackWalker ////////////////////////////////////////////////////// 564 565 566 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 567 jint skip_frames, jint frame_count, jint start_index, 568 jobjectArray frames)) 569 JVMWrapper("JVM_CallStackWalk"); 570 JavaThread* jt = (JavaThread*) THREAD; 571 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 572 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 573 } 574 575 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 576 577 // frames array is a Class<?>[] array when only getting caller reference, 578 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 579 // be null. 580 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 581 objArrayHandle frames_array_h(THREAD, fa); 582 583 int limit = start_index + frame_count; 584 if (frames_array_h->length() < limit) { 585 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 586 } 587 588 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 589 start_index, frames_array_h, CHECK_NULL); 590 return JNIHandles::make_local(env, result); 591 JVM_END 592 593 594 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 595 jint frame_count, jint start_index, 596 jobjectArray frames)) 597 JVMWrapper("JVM_MoreStackWalk"); 598 JavaThread* jt = (JavaThread*) THREAD; 599 600 // frames array is a Class<?>[] array when only getting caller reference, 601 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 602 // be null. 603 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 604 objArrayHandle frames_array_h(THREAD, fa); 605 606 int limit = start_index+frame_count; 607 if (frames_array_h->length() < limit) { 608 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 609 } 610 611 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 612 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 613 start_index, frames_array_h, THREAD); 614 JVM_END 615 616 // java.lang.Object /////////////////////////////////////////////// 617 618 619 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 620 JVMWrapper("JVM_IHashCode"); 621 // as implemented in the classic virtual machine; return 0 if object is NULL 622 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 623 JVM_END 624 625 626 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 627 JVMWrapper("JVM_MonitorWait"); 628 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 629 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 630 if (JvmtiExport::should_post_monitor_wait()) { 631 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 632 633 // The current thread already owns the monitor and it has not yet 634 // been added to the wait queue so the current thread cannot be 635 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 636 // event handler cannot accidentally consume an unpark() meant for 637 // the ParkEvent associated with this ObjectMonitor. 638 } 639 ObjectSynchronizer::wait(obj, ms, CHECK); 640 JVM_END 641 642 643 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 644 JVMWrapper("JVM_MonitorNotify"); 645 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 646 ObjectSynchronizer::notify(obj, CHECK); 647 JVM_END 648 649 650 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 651 JVMWrapper("JVM_MonitorNotifyAll"); 652 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 653 ObjectSynchronizer::notifyall(obj, CHECK); 654 JVM_END 655 656 657 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 658 JVMWrapper("JVM_Clone"); 659 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 660 Klass* klass = obj->klass(); 661 JvmtiVMObjectAllocEventCollector oam; 662 663 #ifdef ASSERT 664 // Just checking that the cloneable flag is set correct 665 if (obj->is_array()) { 666 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 667 } else { 668 guarantee(obj->is_instance(), "should be instanceOop"); 669 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 670 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 671 } 672 #endif 673 674 // Check if class of obj supports the Cloneable interface. 675 // All arrays are considered to be cloneable (See JLS 20.1.5). 676 // All j.l.r.Reference classes are considered non-cloneable. 677 if (!klass->is_cloneable() || 678 (klass->is_instance_klass() && 679 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 680 ResourceMark rm(THREAD); 681 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 682 } 683 684 // Make shallow object copy 685 const int size = obj->size(); 686 oop new_obj_oop = NULL; 687 if (obj->is_array()) { 688 const int length = ((arrayOop)obj())->length(); 689 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 690 /* do_zero */ true, CHECK_NULL); 691 } else { 692 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 693 } 694 695 HeapAccess<>::clone(obj(), new_obj_oop, size); 696 697 Handle new_obj(THREAD, new_obj_oop); 698 // Caution: this involves a java upcall, so the clone should be 699 // "gc-robust" by this stage. 700 if (klass->has_finalizer()) { 701 assert(obj->is_instance(), "should be instanceOop"); 702 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 703 new_obj = Handle(THREAD, new_obj_oop); 704 } 705 706 return JNIHandles::make_local(env, new_obj()); 707 JVM_END 708 709 // java.io.File /////////////////////////////////////////////////////////////// 710 711 JVM_LEAF(char*, JVM_NativePath(char* path)) 712 JVMWrapper("JVM_NativePath"); 713 return os::native_path(path); 714 JVM_END 715 716 717 // Misc. class handling /////////////////////////////////////////////////////////// 718 719 720 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 721 JVMWrapper("JVM_GetCallerClass"); 722 723 // Getting the class of the caller frame. 724 // 725 // The call stack at this point looks something like this: 726 // 727 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 728 // [1] [ @CallerSensitive API.method ] 729 // [.] [ (skipped intermediate frames) ] 730 // [n] [ caller ] 731 vframeStream vfst(thread); 732 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 733 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 734 Method* m = vfst.method(); 735 assert(m != NULL, "sanity"); 736 switch (n) { 737 case 0: 738 // This must only be called from Reflection.getCallerClass 739 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 740 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 741 } 742 // fall-through 743 case 1: 744 // Frame 0 and 1 must be caller sensitive. 745 if (!m->caller_sensitive()) { 746 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 747 } 748 break; 749 default: 750 if (!m->is_ignored_by_security_stack_walk()) { 751 // We have reached the desired frame; return the holder class. 752 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 753 } 754 break; 755 } 756 } 757 return NULL; 758 JVM_END 759 760 761 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 762 JVMWrapper("JVM_FindPrimitiveClass"); 763 oop mirror = NULL; 764 BasicType t = name2type(utf); 765 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 766 mirror = Universe::java_mirror(t); 767 } 768 if (mirror == NULL) { 769 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 770 } else { 771 return (jclass) JNIHandles::make_local(env, mirror); 772 } 773 JVM_END 774 775 776 // Returns a class loaded by the bootstrap class loader; or null 777 // if not found. ClassNotFoundException is not thrown. 778 // FindClassFromBootLoader is exported to the launcher for windows. 779 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 780 const char* name)) 781 JVMWrapper("JVM_FindClassFromBootLoader"); 782 783 // Java libraries should ensure that name is never null... 784 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 785 // It's impossible to create this class; the name cannot fit 786 // into the constant pool. 787 return NULL; 788 } 789 790 TempNewSymbol h_name = SymbolTable::new_symbol(name); 791 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 792 if (k == NULL) { 793 return NULL; 794 } 795 796 if (log_is_enabled(Debug, class, resolve)) { 797 trace_class_resolution(k); 798 } 799 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 800 JVM_END 801 802 // Find a class with this name in this loader, using the caller's protection domain. 803 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 804 jboolean init, jobject loader, 805 jclass caller)) 806 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 807 // Java libraries should ensure that name is never null... 808 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 809 // It's impossible to create this class; the name cannot fit 810 // into the constant pool. 811 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 812 } 813 814 TempNewSymbol h_name = SymbolTable::new_symbol(name); 815 816 oop loader_oop = JNIHandles::resolve(loader); 817 oop from_class = JNIHandles::resolve(caller); 818 oop protection_domain = NULL; 819 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 820 // NPE. Put it in another way, the bootstrap class loader has all permission and 821 // thus no checkPackageAccess equivalence in the VM class loader. 822 // The caller is also passed as NULL by the java code if there is no security 823 // manager to avoid the performance cost of getting the calling class. 824 if (from_class != NULL && loader_oop != NULL) { 825 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 826 } 827 828 Handle h_loader(THREAD, loader_oop); 829 Handle h_prot(THREAD, protection_domain); 830 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 831 h_prot, false, THREAD); 832 833 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 834 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 835 } 836 return result; 837 JVM_END 838 839 // Currently only called from the old verifier. 840 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 841 jboolean init, jclass from)) 842 JVMWrapper("JVM_FindClassFromClass"); 843 if (name == NULL) { 844 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 845 } 846 if ((int)strlen(name) > Symbol::max_length()) { 847 // It's impossible to create this class; the name cannot fit 848 // into the constant pool. 849 Exceptions::fthrow(THREAD_AND_LOCATION, 850 vmSymbols::java_lang_NoClassDefFoundError(), 851 "Class name exceeds maximum length of %d: %s", 852 Symbol::max_length(), 853 name); 854 return 0; 855 } 856 TempNewSymbol h_name = SymbolTable::new_symbol(name); 857 oop from_class_oop = JNIHandles::resolve(from); 858 Klass* from_class = (from_class_oop == NULL) 859 ? (Klass*)NULL 860 : java_lang_Class::as_Klass(from_class_oop); 861 oop class_loader = NULL; 862 oop protection_domain = NULL; 863 if (from_class != NULL) { 864 class_loader = from_class->class_loader(); 865 protection_domain = from_class->protection_domain(); 866 } 867 Handle h_loader(THREAD, class_loader); 868 Handle h_prot (THREAD, protection_domain); 869 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 870 h_prot, true, thread); 871 872 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 873 // this function is generally only used for class loading during verification. 874 ResourceMark rm; 875 oop from_mirror = JNIHandles::resolve_non_null(from); 876 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 877 const char * from_name = from_class->external_name(); 878 879 oop mirror = JNIHandles::resolve_non_null(result); 880 Klass* to_class = java_lang_Class::as_Klass(mirror); 881 const char * to = to_class->external_name(); 882 log_debug(class, resolve)("%s %s (verification)", from_name, to); 883 } 884 885 return result; 886 JVM_END 887 888 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 889 if (loader.is_null()) { 890 return; 891 } 892 893 // check whether the current caller thread holds the lock or not. 894 // If not, increment the corresponding counter 895 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 896 ObjectSynchronizer::owner_self) { 897 counter->inc(); 898 } 899 } 900 901 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 902 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 903 jobject loader, const jbyte *buf, 904 jsize len, jobject pd, const char *source, 905 TRAPS) { 906 if (source == NULL) source = "__JVM_DefineClass__"; 907 908 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 909 JavaThread* jt = (JavaThread*) THREAD; 910 911 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 912 ClassLoader::perf_define_appclass_selftime(), 913 ClassLoader::perf_define_appclasses(), 914 jt->get_thread_stat()->perf_recursion_counts_addr(), 915 jt->get_thread_stat()->perf_timers_addr(), 916 PerfClassTraceTime::DEFINE_CLASS); 917 918 if (UsePerfData) { 919 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 920 } 921 922 // Since exceptions can be thrown, class initialization can take place 923 // if name is NULL no check for class name in .class stream has to be made. 924 TempNewSymbol class_name = NULL; 925 if (name != NULL) { 926 const int str_len = (int)strlen(name); 927 if (str_len > Symbol::max_length()) { 928 // It's impossible to create this class; the name cannot fit 929 // into the constant pool. 930 Exceptions::fthrow(THREAD_AND_LOCATION, 931 vmSymbols::java_lang_NoClassDefFoundError(), 932 "Class name exceeds maximum length of %d: %s", 933 Symbol::max_length(), 934 name); 935 return 0; 936 } 937 class_name = SymbolTable::new_symbol(name, str_len); 938 } 939 940 ResourceMark rm(THREAD); 941 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 942 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 943 if (UsePerfData) { 944 is_lock_held_by_thread(class_loader, 945 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 946 THREAD); 947 } 948 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 949 Klass* k = SystemDictionary::resolve_from_stream(class_name, 950 class_loader, 951 protection_domain, 952 &st, 953 CHECK_NULL); 954 955 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 956 trace_class_resolution(k); 957 } 958 959 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 960 } 961 962 963 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 964 JVMWrapper("JVM_DefineClass"); 965 966 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 967 JVM_END 968 969 970 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 971 JVMWrapper("JVM_DefineClassWithSource"); 972 973 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 974 JVM_END 975 976 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 977 JVMWrapper("JVM_FindLoadedClass"); 978 ResourceMark rm(THREAD); 979 980 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 981 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 982 983 const char* str = java_lang_String::as_utf8_string(string()); 984 // Sanity check, don't expect null 985 if (str == NULL) return NULL; 986 987 const int str_len = (int)strlen(str); 988 if (str_len > Symbol::max_length()) { 989 // It's impossible to create this class; the name cannot fit 990 // into the constant pool. 991 return NULL; 992 } 993 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 994 995 // Security Note: 996 // The Java level wrapper will perform the necessary security check allowing 997 // us to pass the NULL as the initiating class loader. 998 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 999 if (UsePerfData) { 1000 is_lock_held_by_thread(h_loader, 1001 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1002 THREAD); 1003 } 1004 1005 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1006 h_loader, 1007 Handle(), 1008 CHECK_NULL); 1009 #if INCLUDE_CDS 1010 if (k == NULL) { 1011 // If the class is not already loaded, try to see if it's in the shared 1012 // archive for the current classloader (h_loader). 1013 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1014 } 1015 #endif 1016 return (k == NULL) ? NULL : 1017 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1018 JVM_END 1019 1020 // Module support ////////////////////////////////////////////////////////////////////////////// 1021 1022 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1023 jstring location, const char* const* packages, jsize num_packages)) 1024 JVMWrapper("JVM_DefineModule"); 1025 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1026 JVM_END 1027 1028 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1029 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1030 Modules::set_bootloader_unnamed_module(module, CHECK); 1031 JVM_END 1032 1033 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1034 JVMWrapper("JVM_AddModuleExports"); 1035 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1036 JVM_END 1037 1038 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1039 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1040 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1041 JVM_END 1042 1043 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1044 JVMWrapper("JVM_AddModuleExportsToAll"); 1045 Modules::add_module_exports(from_module, package, NULL, CHECK); 1046 JVM_END 1047 1048 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1049 JVMWrapper("JVM_AddReadsModule"); 1050 Modules::add_reads_module(from_module, source_module, CHECK); 1051 JVM_END 1052 1053 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1054 1055 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1056 assert (cls != NULL, "illegal class"); 1057 JVMWrapper("JVM_InitClassName"); 1058 JvmtiVMObjectAllocEventCollector oam; 1059 ResourceMark rm(THREAD); 1060 HandleMark hm(THREAD); 1061 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1062 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1063 return (jstring) JNIHandles::make_local(env, result); 1064 JVM_END 1065 1066 1067 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1068 JVMWrapper("JVM_GetClassInterfaces"); 1069 JvmtiVMObjectAllocEventCollector oam; 1070 oop mirror = JNIHandles::resolve_non_null(cls); 1071 1072 // Special handling for primitive objects 1073 if (java_lang_Class::is_primitive(mirror)) { 1074 // Primitive objects does not have any interfaces 1075 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1076 return (jobjectArray) JNIHandles::make_local(env, r); 1077 } 1078 1079 Klass* klass = java_lang_Class::as_Klass(mirror); 1080 // Figure size of result array 1081 int size; 1082 if (klass->is_instance_klass()) { 1083 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1084 } else { 1085 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1086 size = 2; 1087 } 1088 1089 // Allocate result array 1090 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1091 objArrayHandle result (THREAD, r); 1092 // Fill in result 1093 if (klass->is_instance_klass()) { 1094 // Regular instance klass, fill in all local interfaces 1095 for (int index = 0; index < size; index++) { 1096 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1097 result->obj_at_put(index, k->java_mirror()); 1098 } 1099 } else { 1100 // All arrays implement java.lang.Cloneable and java.io.Serializable 1101 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1102 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1103 } 1104 return (jobjectArray) JNIHandles::make_local(env, result()); 1105 JVM_END 1106 1107 1108 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1109 JVMWrapper("JVM_IsInterface"); 1110 oop mirror = JNIHandles::resolve_non_null(cls); 1111 if (java_lang_Class::is_primitive(mirror)) { 1112 return JNI_FALSE; 1113 } 1114 Klass* k = java_lang_Class::as_Klass(mirror); 1115 jboolean result = k->is_interface(); 1116 assert(!result || k->is_instance_klass(), 1117 "all interfaces are instance types"); 1118 // The compiler intrinsic for isInterface tests the 1119 // Klass::_access_flags bits in the same way. 1120 return result; 1121 JVM_END 1122 1123 1124 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1125 JVMWrapper("JVM_GetClassSigners"); 1126 JvmtiVMObjectAllocEventCollector oam; 1127 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1128 // There are no signers for primitive types 1129 return NULL; 1130 } 1131 1132 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls))); 1133 1134 // If there are no signers set in the class, or if the class 1135 // is an array, return NULL. 1136 if (signers == NULL) return NULL; 1137 1138 // copy of the signers array 1139 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1140 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1141 for (int index = 0; index < signers->length(); index++) { 1142 signers_copy->obj_at_put(index, signers->obj_at(index)); 1143 } 1144 1145 // return the copy 1146 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1147 JVM_END 1148 1149 1150 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1151 JVMWrapper("JVM_SetClassSigners"); 1152 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1153 // This call is ignored for primitive types and arrays. 1154 // Signers are only set once, ClassLoader.java, and thus shouldn't 1155 // be called with an array. Only the bootstrap loader creates arrays. 1156 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1157 if (k->is_instance_klass()) { 1158 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1159 } 1160 } 1161 JVM_END 1162 1163 1164 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1165 JVMWrapper("JVM_GetProtectionDomain"); 1166 if (JNIHandles::resolve(cls) == NULL) { 1167 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1168 } 1169 1170 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1171 // Primitive types does not have a protection domain. 1172 return NULL; 1173 } 1174 1175 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1176 return (jobject) JNIHandles::make_local(env, pd); 1177 JVM_END 1178 1179 1180 // Returns the inherited_access_control_context field of the running thread. 1181 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1182 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1183 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1184 return JNIHandles::make_local(env, result); 1185 JVM_END 1186 1187 class RegisterArrayForGC { 1188 private: 1189 JavaThread *_thread; 1190 public: 1191 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1192 _thread = thread; 1193 _thread->register_array_for_gc(array); 1194 } 1195 1196 ~RegisterArrayForGC() { 1197 _thread->register_array_for_gc(NULL); 1198 } 1199 }; 1200 1201 1202 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1203 JVMWrapper("JVM_GetStackAccessControlContext"); 1204 if (!UsePrivilegedStack) return NULL; 1205 1206 ResourceMark rm(THREAD); 1207 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1208 JvmtiVMObjectAllocEventCollector oam; 1209 1210 // count the protection domains on the execution stack. We collapse 1211 // duplicate consecutive protection domains into a single one, as 1212 // well as stopping when we hit a privileged frame. 1213 1214 oop previous_protection_domain = NULL; 1215 Handle privileged_context(thread, NULL); 1216 bool is_privileged = false; 1217 oop protection_domain = NULL; 1218 1219 // Iterate through Java frames 1220 vframeStream vfst(thread); 1221 for(; !vfst.at_end(); vfst.next()) { 1222 // get method of frame 1223 Method* method = vfst.method(); 1224 1225 // stop at the first privileged frame 1226 if (method->method_holder() == SystemDictionary::AccessController_klass() && 1227 method->name() == vmSymbols::executePrivileged_name()) 1228 { 1229 // this frame is privileged 1230 is_privileged = true; 1231 1232 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1233 1234 StackValueCollection* locals = priv->locals(); 1235 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1236 StackValue* clr_sv = locals->at(2); // Class<?> caller 1237 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1238 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1239 privileged_context = ctx_sv->get_obj(); 1240 Handle caller = clr_sv->get_obj(); 1241 1242 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1243 protection_domain = caller_klass->protection_domain(); 1244 } else { 1245 protection_domain = method->method_holder()->protection_domain(); 1246 } 1247 1248 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) { 1249 local_array->push(protection_domain); 1250 previous_protection_domain = protection_domain; 1251 } 1252 1253 if (is_privileged) break; 1254 } 1255 1256 1257 // either all the domains on the stack were system domains, or 1258 // we had a privileged system domain 1259 if (local_array->is_empty()) { 1260 if (is_privileged && privileged_context.is_null()) return NULL; 1261 1262 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1263 return JNIHandles::make_local(env, result); 1264 } 1265 1266 // the resource area must be registered in case of a gc 1267 RegisterArrayForGC ragc(thread, local_array); 1268 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1269 local_array->length(), CHECK_NULL); 1270 objArrayHandle h_context(thread, context); 1271 for (int index = 0; index < local_array->length(); index++) { 1272 h_context->obj_at_put(index, local_array->at(index)); 1273 } 1274 1275 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1276 1277 return JNIHandles::make_local(env, result); 1278 JVM_END 1279 1280 1281 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1282 JVMWrapper("JVM_IsArrayClass"); 1283 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1284 return (k != NULL) && k->is_array_klass() ? true : false; 1285 JVM_END 1286 1287 1288 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1289 JVMWrapper("JVM_IsPrimitiveClass"); 1290 oop mirror = JNIHandles::resolve_non_null(cls); 1291 return (jboolean) java_lang_Class::is_primitive(mirror); 1292 JVM_END 1293 1294 1295 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1296 JVMWrapper("JVM_GetClassModifiers"); 1297 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1298 // Primitive type 1299 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1300 } 1301 1302 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1303 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1304 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1305 return k->modifier_flags(); 1306 JVM_END 1307 1308 1309 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1310 1311 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1312 JvmtiVMObjectAllocEventCollector oam; 1313 // ofClass is a reference to a java_lang_Class object. The mirror object 1314 // of an InstanceKlass 1315 1316 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1317 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1318 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1319 return (jobjectArray)JNIHandles::make_local(env, result); 1320 } 1321 1322 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1323 InnerClassesIterator iter(k); 1324 1325 if (iter.length() == 0) { 1326 // Neither an inner nor outer class 1327 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1328 return (jobjectArray)JNIHandles::make_local(env, result); 1329 } 1330 1331 // find inner class info 1332 constantPoolHandle cp(thread, k->constants()); 1333 int length = iter.length(); 1334 1335 // Allocate temp. result array 1336 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1337 objArrayHandle result (THREAD, r); 1338 int members = 0; 1339 1340 for (; !iter.done(); iter.next()) { 1341 int ioff = iter.inner_class_info_index(); 1342 int ooff = iter.outer_class_info_index(); 1343 1344 if (ioff != 0 && ooff != 0) { 1345 // Check to see if the name matches the class we're looking for 1346 // before attempting to find the class. 1347 if (cp->klass_name_at_matches(k, ooff)) { 1348 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1349 if (outer_klass == k) { 1350 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1351 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1352 1353 // Throws an exception if outer klass has not declared k as 1354 // an inner klass 1355 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1356 1357 result->obj_at_put(members, inner_klass->java_mirror()); 1358 members++; 1359 } 1360 } 1361 } 1362 } 1363 1364 if (members != length) { 1365 // Return array of right length 1366 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1367 for(int i = 0; i < members; i++) { 1368 res->obj_at_put(i, result->obj_at(i)); 1369 } 1370 return (jobjectArray)JNIHandles::make_local(env, res); 1371 } 1372 1373 return (jobjectArray)JNIHandles::make_local(env, result()); 1374 JVM_END 1375 1376 1377 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1378 { 1379 // ofClass is a reference to a java_lang_Class object. 1380 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1381 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1382 return NULL; 1383 } 1384 1385 bool inner_is_member = false; 1386 Klass* outer_klass 1387 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1388 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1389 if (outer_klass == NULL) return NULL; // already a top-level class 1390 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1391 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1392 } 1393 JVM_END 1394 1395 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1396 { 1397 oop mirror = JNIHandles::resolve_non_null(cls); 1398 if (java_lang_Class::is_primitive(mirror) || 1399 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1400 return NULL; 1401 } 1402 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1403 int ooff = 0, noff = 0; 1404 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1405 if (noff != 0) { 1406 constantPoolHandle i_cp(thread, k->constants()); 1407 Symbol* name = i_cp->symbol_at(noff); 1408 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1409 return (jstring) JNIHandles::make_local(env, str()); 1410 } 1411 } 1412 return NULL; 1413 } 1414 JVM_END 1415 1416 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1417 assert (cls != NULL, "illegal class"); 1418 JVMWrapper("JVM_GetClassSignature"); 1419 JvmtiVMObjectAllocEventCollector oam; 1420 ResourceMark rm(THREAD); 1421 // Return null for arrays and primatives 1422 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1423 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1424 if (k->is_instance_klass()) { 1425 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1426 if (sym == NULL) return NULL; 1427 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1428 return (jstring) JNIHandles::make_local(env, str()); 1429 } 1430 } 1431 return NULL; 1432 JVM_END 1433 1434 1435 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1436 assert (cls != NULL, "illegal class"); 1437 JVMWrapper("JVM_GetClassAnnotations"); 1438 1439 // Return null for arrays and primitives 1440 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1441 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1442 if (k->is_instance_klass()) { 1443 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1444 return (jbyteArray) JNIHandles::make_local(env, a); 1445 } 1446 } 1447 return NULL; 1448 JVM_END 1449 1450 1451 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1452 // some of this code was adapted from from jni_FromReflectedField 1453 1454 oop reflected = JNIHandles::resolve_non_null(field); 1455 oop mirror = java_lang_reflect_Field::clazz(reflected); 1456 Klass* k = java_lang_Class::as_Klass(mirror); 1457 int slot = java_lang_reflect_Field::slot(reflected); 1458 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1459 1460 InstanceKlass* ik = InstanceKlass::cast(k); 1461 intptr_t offset = ik->field_offset(slot); 1462 1463 if (modifiers & JVM_ACC_STATIC) { 1464 // for static fields we only look in the current class 1465 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1466 assert(false, "cannot find static field"); 1467 return false; 1468 } 1469 } else { 1470 // for instance fields we start with the current class and work 1471 // our way up through the superclass chain 1472 if (!ik->find_field_from_offset(offset, false, &fd)) { 1473 assert(false, "cannot find instance field"); 1474 return false; 1475 } 1476 } 1477 return true; 1478 } 1479 1480 static Method* jvm_get_method_common(jobject method) { 1481 // some of this code was adapted from from jni_FromReflectedMethod 1482 1483 oop reflected = JNIHandles::resolve_non_null(method); 1484 oop mirror = NULL; 1485 int slot = 0; 1486 1487 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1488 mirror = java_lang_reflect_Constructor::clazz(reflected); 1489 slot = java_lang_reflect_Constructor::slot(reflected); 1490 } else { 1491 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1492 "wrong type"); 1493 mirror = java_lang_reflect_Method::clazz(reflected); 1494 slot = java_lang_reflect_Method::slot(reflected); 1495 } 1496 Klass* k = java_lang_Class::as_Klass(mirror); 1497 1498 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1499 assert(m != NULL, "cannot find method"); 1500 return m; // caller has to deal with NULL in product mode 1501 } 1502 1503 /* Type use annotations support (JDK 1.8) */ 1504 1505 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1506 assert (cls != NULL, "illegal class"); 1507 JVMWrapper("JVM_GetClassTypeAnnotations"); 1508 ResourceMark rm(THREAD); 1509 // Return null for arrays and primitives 1510 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1511 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1512 if (k->is_instance_klass()) { 1513 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1514 if (type_annotations != NULL) { 1515 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1516 return (jbyteArray) JNIHandles::make_local(env, a); 1517 } 1518 } 1519 } 1520 return NULL; 1521 JVM_END 1522 1523 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1524 assert (method != NULL, "illegal method"); 1525 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1526 1527 // method is a handle to a java.lang.reflect.Method object 1528 Method* m = jvm_get_method_common(method); 1529 if (m == NULL) { 1530 return NULL; 1531 } 1532 1533 AnnotationArray* type_annotations = m->type_annotations(); 1534 if (type_annotations != NULL) { 1535 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1536 return (jbyteArray) JNIHandles::make_local(env, a); 1537 } 1538 1539 return NULL; 1540 JVM_END 1541 1542 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1543 assert (field != NULL, "illegal field"); 1544 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1545 1546 fieldDescriptor fd; 1547 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1548 if (!gotFd) { 1549 return NULL; 1550 } 1551 1552 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1553 JVM_END 1554 1555 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1556 if (!cp->is_within_bounds(index)) { 1557 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1558 } 1559 } 1560 1561 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1562 { 1563 JVMWrapper("JVM_GetMethodParameters"); 1564 // method is a handle to a java.lang.reflect.Method object 1565 Method* method_ptr = jvm_get_method_common(method); 1566 methodHandle mh (THREAD, method_ptr); 1567 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1568 const int num_params = mh->method_parameters_length(); 1569 1570 if (num_params < 0) { 1571 // A -1 return value from method_parameters_length means there is no 1572 // parameter data. Return null to indicate this to the reflection 1573 // API. 1574 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1575 return (jobjectArray)NULL; 1576 } else { 1577 // Otherwise, we return something up to reflection, even if it is 1578 // a zero-length array. Why? Because in some cases this can 1579 // trigger a MalformedParametersException. 1580 1581 // make sure all the symbols are properly formatted 1582 for (int i = 0; i < num_params; i++) { 1583 MethodParametersElement* params = mh->method_parameters_start(); 1584 int index = params[i].name_cp_index; 1585 bounds_check(mh->constants(), index, CHECK_NULL); 1586 1587 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1588 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1589 "Wrong type at constant pool index"); 1590 } 1591 1592 } 1593 1594 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1595 objArrayHandle result (THREAD, result_oop); 1596 1597 for (int i = 0; i < num_params; i++) { 1598 MethodParametersElement* params = mh->method_parameters_start(); 1599 // For a 0 index, give a NULL symbol 1600 Symbol* sym = 0 != params[i].name_cp_index ? 1601 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1602 int flags = params[i].flags; 1603 oop param = Reflection::new_parameter(reflected_method, i, sym, 1604 flags, CHECK_NULL); 1605 result->obj_at_put(i, param); 1606 } 1607 return (jobjectArray)JNIHandles::make_local(env, result()); 1608 } 1609 } 1610 JVM_END 1611 1612 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1613 1614 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1615 { 1616 JVMWrapper("JVM_GetClassDeclaredFields"); 1617 JvmtiVMObjectAllocEventCollector oam; 1618 1619 // Exclude primitive types and array types 1620 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1621 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1622 // Return empty array 1623 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1624 return (jobjectArray) JNIHandles::make_local(env, res); 1625 } 1626 1627 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1628 constantPoolHandle cp(THREAD, k->constants()); 1629 1630 // Ensure class is linked 1631 k->link_class(CHECK_NULL); 1632 1633 // Allocate result 1634 int num_fields; 1635 1636 if (publicOnly) { 1637 num_fields = 0; 1638 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1639 if (fs.access_flags().is_public()) ++num_fields; 1640 } 1641 } else { 1642 num_fields = k->java_fields_count(); 1643 } 1644 1645 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1646 objArrayHandle result (THREAD, r); 1647 1648 int out_idx = 0; 1649 fieldDescriptor fd; 1650 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1651 if (!publicOnly || fs.access_flags().is_public()) { 1652 fd.reinitialize(k, fs.index()); 1653 oop field = Reflection::new_field(&fd, CHECK_NULL); 1654 result->obj_at_put(out_idx, field); 1655 ++out_idx; 1656 } 1657 } 1658 assert(out_idx == num_fields, "just checking"); 1659 return (jobjectArray) JNIHandles::make_local(env, result()); 1660 } 1661 JVM_END 1662 1663 static bool select_method(const methodHandle& method, bool want_constructor) { 1664 if (want_constructor) { 1665 return (method->is_initializer() && !method->is_static()); 1666 } else { 1667 return (!method->is_initializer() && !method->is_overpass()); 1668 } 1669 } 1670 1671 static jobjectArray get_class_declared_methods_helper( 1672 JNIEnv *env, 1673 jclass ofClass, jboolean publicOnly, 1674 bool want_constructor, 1675 Klass* klass, TRAPS) { 1676 1677 JvmtiVMObjectAllocEventCollector oam; 1678 1679 // Exclude primitive types and array types 1680 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1681 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1682 // Return empty array 1683 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1684 return (jobjectArray) JNIHandles::make_local(env, res); 1685 } 1686 1687 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1688 1689 // Ensure class is linked 1690 k->link_class(CHECK_NULL); 1691 1692 Array<Method*>* methods = k->methods(); 1693 int methods_length = methods->length(); 1694 1695 // Save original method_idnum in case of redefinition, which can change 1696 // the idnum of obsolete methods. The new method will have the same idnum 1697 // but if we refresh the methods array, the counts will be wrong. 1698 ResourceMark rm(THREAD); 1699 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1700 int num_methods = 0; 1701 1702 for (int i = 0; i < methods_length; i++) { 1703 methodHandle method(THREAD, methods->at(i)); 1704 if (select_method(method, want_constructor)) { 1705 if (!publicOnly || method->is_public()) { 1706 idnums->push(method->method_idnum()); 1707 ++num_methods; 1708 } 1709 } 1710 } 1711 1712 // Allocate result 1713 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1714 objArrayHandle result (THREAD, r); 1715 1716 // Now just put the methods that we selected above, but go by their idnum 1717 // in case of redefinition. The methods can be redefined at any safepoint, 1718 // so above when allocating the oop array and below when creating reflect 1719 // objects. 1720 for (int i = 0; i < num_methods; i++) { 1721 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1722 if (method.is_null()) { 1723 // Method may have been deleted and seems this API can handle null 1724 // Otherwise should probably put a method that throws NSME 1725 result->obj_at_put(i, NULL); 1726 } else { 1727 oop m; 1728 if (want_constructor) { 1729 m = Reflection::new_constructor(method, CHECK_NULL); 1730 } else { 1731 m = Reflection::new_method(method, false, CHECK_NULL); 1732 } 1733 result->obj_at_put(i, m); 1734 } 1735 } 1736 1737 return (jobjectArray) JNIHandles::make_local(env, result()); 1738 } 1739 1740 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1741 { 1742 JVMWrapper("JVM_GetClassDeclaredMethods"); 1743 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1744 /*want_constructor*/ false, 1745 SystemDictionary::reflect_Method_klass(), THREAD); 1746 } 1747 JVM_END 1748 1749 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1750 { 1751 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1752 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1753 /*want_constructor*/ true, 1754 SystemDictionary::reflect_Constructor_klass(), THREAD); 1755 } 1756 JVM_END 1757 1758 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1759 { 1760 JVMWrapper("JVM_GetClassAccessFlags"); 1761 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1762 // Primitive type 1763 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1764 } 1765 1766 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1767 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1768 } 1769 JVM_END 1770 1771 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1772 { 1773 JVMWrapper("JVM_AreNestMates"); 1774 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1775 assert(c->is_instance_klass(), "must be"); 1776 InstanceKlass* ck = InstanceKlass::cast(c); 1777 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 1778 assert(m->is_instance_klass(), "must be"); 1779 InstanceKlass* mk = InstanceKlass::cast(m); 1780 return ck->has_nestmate_access_to(mk, THREAD); 1781 } 1782 JVM_END 1783 1784 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1785 { 1786 // current is not a primitive or array class 1787 JVMWrapper("JVM_GetNestHost"); 1788 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1789 assert(c->is_instance_klass(), "must be"); 1790 InstanceKlass* ck = InstanceKlass::cast(c); 1791 // Don't post exceptions if validation fails 1792 InstanceKlass* host = ck->nest_host(NULL, THREAD); 1793 return (jclass) (host == NULL ? NULL : 1794 JNIHandles::make_local(THREAD, host->java_mirror())); 1795 } 1796 JVM_END 1797 1798 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1799 { 1800 // current is not a primitive or array class 1801 JVMWrapper("JVM_GetNestMembers"); 1802 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1803 assert(c->is_instance_klass(), "must be"); 1804 InstanceKlass* ck = InstanceKlass::cast(c); 1805 // Get the nest host for this nest - throw ICCE if validation fails 1806 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError(); 1807 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL); 1808 1809 { 1810 JvmtiVMObjectAllocEventCollector oam; 1811 Array<u2>* members = host->nest_members(); 1812 int length = members == NULL ? 0 : members->length(); 1813 // nest host is first in the array so make it one bigger 1814 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 1815 length + 1, CHECK_NULL); 1816 objArrayHandle result (THREAD, r); 1817 result->obj_at_put(0, host->java_mirror()); 1818 if (length != 0) { 1819 int i; 1820 for (i = 0; i < length; i++) { 1821 int cp_index = members->at(i); 1822 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL); 1823 if (k->is_instance_klass()) { 1824 InstanceKlass* nest_host_k = 1825 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL); 1826 if (nest_host_k == host) { 1827 result->obj_at_put(i+1, k->java_mirror()); 1828 } 1829 else { 1830 // k's nest host is legal but it isn't our host so 1831 // throw ICCE 1832 ResourceMark rm(THREAD); 1833 Exceptions::fthrow(THREAD_AND_LOCATION, 1834 icce, 1835 "Nest member %s in %s declares a different nest host of %s", 1836 k->external_name(), 1837 host->external_name(), 1838 nest_host_k->external_name() 1839 ); 1840 return NULL; 1841 } 1842 } 1843 else { 1844 // we have a bad nest member entry - throw ICCE 1845 ResourceMark rm(THREAD); 1846 Exceptions::fthrow(THREAD_AND_LOCATION, 1847 icce, 1848 "Class %s can not be a nest member of %s", 1849 k->external_name(), 1850 host->external_name() 1851 ); 1852 return NULL; 1853 } 1854 } 1855 } 1856 else { 1857 assert(host == ck, "must be singleton nest"); 1858 } 1859 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1860 } 1861 } 1862 JVM_END 1863 1864 // Constant pool access ////////////////////////////////////////////////////////// 1865 1866 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1867 { 1868 JVMWrapper("JVM_GetClassConstantPool"); 1869 JvmtiVMObjectAllocEventCollector oam; 1870 1871 // Return null for primitives and arrays 1872 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1873 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1874 if (k->is_instance_klass()) { 1875 InstanceKlass* k_h = InstanceKlass::cast(k); 1876 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1877 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1878 return JNIHandles::make_local(jcp()); 1879 } 1880 } 1881 return NULL; 1882 } 1883 JVM_END 1884 1885 1886 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1887 { 1888 JVMWrapper("JVM_ConstantPoolGetSize"); 1889 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1890 return cp->length(); 1891 } 1892 JVM_END 1893 1894 1895 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1896 { 1897 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1898 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1899 bounds_check(cp, index, CHECK_NULL); 1900 constantTag tag = cp->tag_at(index); 1901 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1902 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1903 } 1904 Klass* k = cp->klass_at(index, CHECK_NULL); 1905 return (jclass) JNIHandles::make_local(k->java_mirror()); 1906 } 1907 JVM_END 1908 1909 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1910 { 1911 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1912 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1913 bounds_check(cp, index, CHECK_NULL); 1914 constantTag tag = cp->tag_at(index); 1915 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1916 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1917 } 1918 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1919 if (k == NULL) return NULL; 1920 return (jclass) JNIHandles::make_local(k->java_mirror()); 1921 } 1922 JVM_END 1923 1924 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 1925 constantTag tag = cp->tag_at(index); 1926 if (!tag.is_method() && !tag.is_interface_method()) { 1927 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1928 } 1929 int klass_ref = cp->uncached_klass_ref_index_at(index); 1930 Klass* k_o; 1931 if (force_resolution) { 1932 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1933 } else { 1934 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1935 if (k_o == NULL) return NULL; 1936 } 1937 InstanceKlass* k = InstanceKlass::cast(k_o); 1938 Symbol* name = cp->uncached_name_ref_at(index); 1939 Symbol* sig = cp->uncached_signature_ref_at(index); 1940 methodHandle m (THREAD, k->find_method(name, sig)); 1941 if (m.is_null()) { 1942 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1943 } 1944 oop method; 1945 if (!m->is_initializer() || m->is_static()) { 1946 method = Reflection::new_method(m, true, CHECK_NULL); 1947 } else { 1948 method = Reflection::new_constructor(m, CHECK_NULL); 1949 } 1950 return JNIHandles::make_local(method); 1951 } 1952 1953 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1954 { 1955 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1956 JvmtiVMObjectAllocEventCollector oam; 1957 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1958 bounds_check(cp, index, CHECK_NULL); 1959 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1960 return res; 1961 } 1962 JVM_END 1963 1964 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1965 { 1966 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 1967 JvmtiVMObjectAllocEventCollector oam; 1968 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1969 bounds_check(cp, index, CHECK_NULL); 1970 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 1971 return res; 1972 } 1973 JVM_END 1974 1975 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1976 constantTag tag = cp->tag_at(index); 1977 if (!tag.is_field()) { 1978 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1979 } 1980 int klass_ref = cp->uncached_klass_ref_index_at(index); 1981 Klass* k_o; 1982 if (force_resolution) { 1983 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1984 } else { 1985 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1986 if (k_o == NULL) return NULL; 1987 } 1988 InstanceKlass* k = InstanceKlass::cast(k_o); 1989 Symbol* name = cp->uncached_name_ref_at(index); 1990 Symbol* sig = cp->uncached_signature_ref_at(index); 1991 fieldDescriptor fd; 1992 Klass* target_klass = k->find_field(name, sig, &fd); 1993 if (target_klass == NULL) { 1994 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 1995 } 1996 oop field = Reflection::new_field(&fd, CHECK_NULL); 1997 return JNIHandles::make_local(field); 1998 } 1999 2000 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2001 { 2002 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2003 JvmtiVMObjectAllocEventCollector oam; 2004 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2005 bounds_check(cp, index, CHECK_NULL); 2006 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2007 return res; 2008 } 2009 JVM_END 2010 2011 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2012 { 2013 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2014 JvmtiVMObjectAllocEventCollector oam; 2015 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2016 bounds_check(cp, index, CHECK_NULL); 2017 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2018 return res; 2019 } 2020 JVM_END 2021 2022 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2023 { 2024 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2025 JvmtiVMObjectAllocEventCollector oam; 2026 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2027 bounds_check(cp, index, CHECK_NULL); 2028 constantTag tag = cp->tag_at(index); 2029 if (!tag.is_field_or_method()) { 2030 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2031 } 2032 int klass_ref = cp->uncached_klass_ref_index_at(index); 2033 Symbol* klass_name = cp->klass_name_at(klass_ref); 2034 Symbol* member_name = cp->uncached_name_ref_at(index); 2035 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2036 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2037 objArrayHandle dest(THREAD, dest_o); 2038 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2039 dest->obj_at_put(0, str()); 2040 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2041 dest->obj_at_put(1, str()); 2042 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2043 dest->obj_at_put(2, str()); 2044 return (jobjectArray) JNIHandles::make_local(dest()); 2045 } 2046 JVM_END 2047 2048 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2049 { 2050 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2051 JvmtiVMObjectAllocEventCollector oam; 2052 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2053 bounds_check(cp, index, CHECK_0); 2054 constantTag tag = cp->tag_at(index); 2055 if (!tag.is_field_or_method()) { 2056 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2057 } 2058 return (jint) cp->uncached_klass_ref_index_at(index); 2059 } 2060 JVM_END 2061 2062 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2063 { 2064 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2065 JvmtiVMObjectAllocEventCollector oam; 2066 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2067 bounds_check(cp, index, CHECK_0); 2068 constantTag tag = cp->tag_at(index); 2069 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2070 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2071 } 2072 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2073 } 2074 JVM_END 2075 2076 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2077 { 2078 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2079 JvmtiVMObjectAllocEventCollector oam; 2080 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2081 bounds_check(cp, index, CHECK_NULL); 2082 constantTag tag = cp->tag_at(index); 2083 if (!tag.is_name_and_type()) { 2084 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2085 } 2086 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2087 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2088 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2089 objArrayHandle dest(THREAD, dest_o); 2090 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2091 dest->obj_at_put(0, str()); 2092 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2093 dest->obj_at_put(1, str()); 2094 return (jobjectArray) JNIHandles::make_local(dest()); 2095 } 2096 JVM_END 2097 2098 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2099 { 2100 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2101 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2102 bounds_check(cp, index, CHECK_0); 2103 constantTag tag = cp->tag_at(index); 2104 if (!tag.is_int()) { 2105 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2106 } 2107 return cp->int_at(index); 2108 } 2109 JVM_END 2110 2111 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2112 { 2113 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2114 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2115 bounds_check(cp, index, CHECK_(0L)); 2116 constantTag tag = cp->tag_at(index); 2117 if (!tag.is_long()) { 2118 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2119 } 2120 return cp->long_at(index); 2121 } 2122 JVM_END 2123 2124 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2125 { 2126 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2127 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2128 bounds_check(cp, index, CHECK_(0.0f)); 2129 constantTag tag = cp->tag_at(index); 2130 if (!tag.is_float()) { 2131 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2132 } 2133 return cp->float_at(index); 2134 } 2135 JVM_END 2136 2137 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2138 { 2139 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2140 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2141 bounds_check(cp, index, CHECK_(0.0)); 2142 constantTag tag = cp->tag_at(index); 2143 if (!tag.is_double()) { 2144 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2145 } 2146 return cp->double_at(index); 2147 } 2148 JVM_END 2149 2150 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2151 { 2152 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2154 bounds_check(cp, index, CHECK_NULL); 2155 constantTag tag = cp->tag_at(index); 2156 if (!tag.is_string()) { 2157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2158 } 2159 oop str = cp->string_at(index, CHECK_NULL); 2160 return (jstring) JNIHandles::make_local(str); 2161 } 2162 JVM_END 2163 2164 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2165 { 2166 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2167 JvmtiVMObjectAllocEventCollector oam; 2168 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2169 bounds_check(cp, index, CHECK_NULL); 2170 constantTag tag = cp->tag_at(index); 2171 if (!tag.is_symbol()) { 2172 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2173 } 2174 Symbol* sym = cp->symbol_at(index); 2175 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2176 return (jstring) JNIHandles::make_local(str()); 2177 } 2178 JVM_END 2179 2180 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2181 { 2182 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2183 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2184 bounds_check(cp, index, CHECK_0); 2185 constantTag tag = cp->tag_at(index); 2186 jbyte result = tag.value(); 2187 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2188 // they are changed to the corresponding tags from the JVM spec, so that java code in 2189 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2190 if (tag.is_klass_or_reference()) { 2191 result = JVM_CONSTANT_Class; 2192 } else if (tag.is_string_index()) { 2193 result = JVM_CONSTANT_String; 2194 } else if (tag.is_method_type_in_error()) { 2195 result = JVM_CONSTANT_MethodType; 2196 } else if (tag.is_method_handle_in_error()) { 2197 result = JVM_CONSTANT_MethodHandle; 2198 } else if (tag.is_dynamic_constant_in_error()) { 2199 result = JVM_CONSTANT_Dynamic; 2200 } 2201 return result; 2202 } 2203 JVM_END 2204 2205 // Assertion support. ////////////////////////////////////////////////////////// 2206 2207 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2208 JVMWrapper("JVM_DesiredAssertionStatus"); 2209 assert(cls != NULL, "bad class"); 2210 2211 oop r = JNIHandles::resolve(cls); 2212 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2213 if (java_lang_Class::is_primitive(r)) return false; 2214 2215 Klass* k = java_lang_Class::as_Klass(r); 2216 assert(k->is_instance_klass(), "must be an instance klass"); 2217 if (!k->is_instance_klass()) return false; 2218 2219 ResourceMark rm(THREAD); 2220 const char* name = k->name()->as_C_string(); 2221 bool system_class = k->class_loader() == NULL; 2222 return JavaAssertions::enabled(name, system_class); 2223 2224 JVM_END 2225 2226 2227 // Return a new AssertionStatusDirectives object with the fields filled in with 2228 // command-line assertion arguments (i.e., -ea, -da). 2229 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2230 JVMWrapper("JVM_AssertionStatusDirectives"); 2231 JvmtiVMObjectAllocEventCollector oam; 2232 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2233 return JNIHandles::make_local(env, asd); 2234 JVM_END 2235 2236 // Verification //////////////////////////////////////////////////////////////////////////////// 2237 2238 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2239 2240 // RedefineClasses support: bug 6214132 caused verification to fail. 2241 // All functions from this section should call the jvmtiThreadSate function: 2242 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2243 // The function returns a Klass* of the _scratch_class if the verifier 2244 // was invoked in the middle of the class redefinition. 2245 // Otherwise it returns its argument value which is the _the_class Klass*. 2246 // Please, refer to the description in the jvmtiThreadSate.hpp. 2247 2248 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2249 JVMWrapper("JVM_GetClassNameUTF"); 2250 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2251 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2252 return k->name()->as_utf8(); 2253 JVM_END 2254 2255 2256 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2257 JVMWrapper("JVM_GetClassCPTypes"); 2258 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2259 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2260 // types will have length zero if this is not an InstanceKlass 2261 // (length is determined by call to JVM_GetClassCPEntriesCount) 2262 if (k->is_instance_klass()) { 2263 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2264 for (int index = cp->length() - 1; index >= 0; index--) { 2265 constantTag tag = cp->tag_at(index); 2266 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2267 } 2268 } 2269 JVM_END 2270 2271 2272 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2273 JVMWrapper("JVM_GetClassCPEntriesCount"); 2274 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2275 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2276 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2277 JVM_END 2278 2279 2280 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2281 JVMWrapper("JVM_GetClassFieldsCount"); 2282 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2283 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2284 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2285 JVM_END 2286 2287 2288 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2289 JVMWrapper("JVM_GetClassMethodsCount"); 2290 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2291 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2292 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2293 JVM_END 2294 2295 2296 // The following methods, used for the verifier, are never called with 2297 // array klasses, so a direct cast to InstanceKlass is safe. 2298 // Typically, these methods are called in a loop with bounds determined 2299 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2300 // zero for arrays. 2301 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2302 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2303 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2304 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2305 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2306 int length = method->checked_exceptions_length(); 2307 if (length > 0) { 2308 CheckedExceptionElement* table= method->checked_exceptions_start(); 2309 for (int i = 0; i < length; i++) { 2310 exceptions[i] = table[i].class_cp_index; 2311 } 2312 } 2313 JVM_END 2314 2315 2316 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2317 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2318 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2319 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2320 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2321 return method->checked_exceptions_length(); 2322 JVM_END 2323 2324 2325 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2326 JVMWrapper("JVM_GetMethodIxByteCode"); 2327 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2328 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2329 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2330 memcpy(code, method->code_base(), method->code_size()); 2331 JVM_END 2332 2333 2334 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2335 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2336 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2337 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2338 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2339 return method->code_size(); 2340 JVM_END 2341 2342 2343 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2344 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2345 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2346 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2347 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2348 ExceptionTable extable(method); 2349 entry->start_pc = extable.start_pc(entry_index); 2350 entry->end_pc = extable.end_pc(entry_index); 2351 entry->handler_pc = extable.handler_pc(entry_index); 2352 entry->catchType = extable.catch_type_index(entry_index); 2353 JVM_END 2354 2355 2356 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2357 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2358 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2359 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2360 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2361 return method->exception_table_length(); 2362 JVM_END 2363 2364 2365 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2366 JVMWrapper("JVM_GetMethodIxModifiers"); 2367 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2368 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2369 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2370 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2371 JVM_END 2372 2373 2374 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2375 JVMWrapper("JVM_GetFieldIxModifiers"); 2376 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2377 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2378 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2379 JVM_END 2380 2381 2382 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2383 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2384 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2385 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2386 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2387 return method->max_locals(); 2388 JVM_END 2389 2390 2391 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2392 JVMWrapper("JVM_GetMethodIxArgsSize"); 2393 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2394 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2395 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2396 return method->size_of_parameters(); 2397 JVM_END 2398 2399 2400 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2401 JVMWrapper("JVM_GetMethodIxMaxStack"); 2402 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2403 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2404 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2405 return method->verifier_max_stack(); 2406 JVM_END 2407 2408 2409 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2410 JVMWrapper("JVM_IsConstructorIx"); 2411 ResourceMark rm(THREAD); 2412 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2413 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2414 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2415 return method->name() == vmSymbols::object_initializer_name(); 2416 JVM_END 2417 2418 2419 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2420 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2421 ResourceMark rm(THREAD); 2422 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2423 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2424 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2425 return method->is_overpass(); 2426 JVM_END 2427 2428 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2429 JVMWrapper("JVM_GetMethodIxIxUTF"); 2430 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2431 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2432 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2433 return method->name()->as_utf8(); 2434 JVM_END 2435 2436 2437 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2438 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2439 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2440 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2441 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2442 return method->signature()->as_utf8(); 2443 JVM_END 2444 2445 /** 2446 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2447 * read entries in the constant pool. Since the old verifier always 2448 * works on a copy of the code, it will not see any rewriting that 2449 * may possibly occur in the middle of verification. So it is important 2450 * that nothing it calls tries to use the cpCache instead of the raw 2451 * constant pool, so we must use cp->uncached_x methods when appropriate. 2452 */ 2453 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2454 JVMWrapper("JVM_GetCPFieldNameUTF"); 2455 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2456 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2457 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2458 switch (cp->tag_at(cp_index).value()) { 2459 case JVM_CONSTANT_Fieldref: 2460 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2461 default: 2462 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2463 } 2464 ShouldNotReachHere(); 2465 return NULL; 2466 JVM_END 2467 2468 2469 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2470 JVMWrapper("JVM_GetCPMethodNameUTF"); 2471 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2472 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2473 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2474 switch (cp->tag_at(cp_index).value()) { 2475 case JVM_CONSTANT_InterfaceMethodref: 2476 case JVM_CONSTANT_Methodref: 2477 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2478 default: 2479 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2480 } 2481 ShouldNotReachHere(); 2482 return NULL; 2483 JVM_END 2484 2485 2486 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2487 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2488 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2489 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2490 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2491 switch (cp->tag_at(cp_index).value()) { 2492 case JVM_CONSTANT_InterfaceMethodref: 2493 case JVM_CONSTANT_Methodref: 2494 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2495 default: 2496 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2497 } 2498 ShouldNotReachHere(); 2499 return NULL; 2500 JVM_END 2501 2502 2503 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2504 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2505 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2506 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2507 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2508 switch (cp->tag_at(cp_index).value()) { 2509 case JVM_CONSTANT_Fieldref: 2510 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2511 default: 2512 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2513 } 2514 ShouldNotReachHere(); 2515 return NULL; 2516 JVM_END 2517 2518 2519 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2520 JVMWrapper("JVM_GetCPClassNameUTF"); 2521 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2522 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2523 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2524 Symbol* classname = cp->klass_name_at(cp_index); 2525 return classname->as_utf8(); 2526 JVM_END 2527 2528 2529 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2530 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2531 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2532 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2533 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2534 switch (cp->tag_at(cp_index).value()) { 2535 case JVM_CONSTANT_Fieldref: { 2536 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2537 Symbol* classname = cp->klass_name_at(class_index); 2538 return classname->as_utf8(); 2539 } 2540 default: 2541 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2542 } 2543 ShouldNotReachHere(); 2544 return NULL; 2545 JVM_END 2546 2547 2548 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2549 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2550 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2551 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2552 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2553 switch (cp->tag_at(cp_index).value()) { 2554 case JVM_CONSTANT_Methodref: 2555 case JVM_CONSTANT_InterfaceMethodref: { 2556 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2557 Symbol* classname = cp->klass_name_at(class_index); 2558 return classname->as_utf8(); 2559 } 2560 default: 2561 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2562 } 2563 ShouldNotReachHere(); 2564 return NULL; 2565 JVM_END 2566 2567 2568 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2569 JVMWrapper("JVM_GetCPFieldModifiers"); 2570 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2571 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2572 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2573 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2574 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2575 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2576 switch (cp->tag_at(cp_index).value()) { 2577 case JVM_CONSTANT_Fieldref: { 2578 Symbol* name = cp->uncached_name_ref_at(cp_index); 2579 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2580 InstanceKlass* ik = InstanceKlass::cast(k_called); 2581 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2582 if (fs.name() == name && fs.signature() == signature) { 2583 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2584 } 2585 } 2586 return -1; 2587 } 2588 default: 2589 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2590 } 2591 ShouldNotReachHere(); 2592 return 0; 2593 JVM_END 2594 2595 2596 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2597 JVMWrapper("JVM_GetCPMethodModifiers"); 2598 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2599 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2600 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2601 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2602 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2603 switch (cp->tag_at(cp_index).value()) { 2604 case JVM_CONSTANT_Methodref: 2605 case JVM_CONSTANT_InterfaceMethodref: { 2606 Symbol* name = cp->uncached_name_ref_at(cp_index); 2607 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2608 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2609 int methods_count = methods->length(); 2610 for (int i = 0; i < methods_count; i++) { 2611 Method* method = methods->at(i); 2612 if (method->name() == name && method->signature() == signature) { 2613 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2614 } 2615 } 2616 return -1; 2617 } 2618 default: 2619 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2620 } 2621 ShouldNotReachHere(); 2622 return 0; 2623 JVM_END 2624 2625 2626 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2627 2628 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2629 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2630 JVM_END 2631 2632 2633 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2634 JVMWrapper("JVM_IsSameClassPackage"); 2635 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2636 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2637 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2638 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2639 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2640 JVM_END 2641 2642 // Printing support ////////////////////////////////////////////////// 2643 extern "C" { 2644 2645 ATTRIBUTE_PRINTF(3, 0) 2646 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2647 // Reject count values that are negative signed values converted to 2648 // unsigned; see bug 4399518, 4417214 2649 if ((intptr_t)count <= 0) return -1; 2650 2651 int result = os::vsnprintf(str, count, fmt, args); 2652 if (result > 0 && (size_t)result >= count) { 2653 result = -1; 2654 } 2655 2656 return result; 2657 } 2658 2659 ATTRIBUTE_PRINTF(3, 4) 2660 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2661 va_list args; 2662 int len; 2663 va_start(args, fmt); 2664 len = jio_vsnprintf(str, count, fmt, args); 2665 va_end(args); 2666 return len; 2667 } 2668 2669 ATTRIBUTE_PRINTF(2, 3) 2670 int jio_fprintf(FILE* f, const char *fmt, ...) { 2671 int len; 2672 va_list args; 2673 va_start(args, fmt); 2674 len = jio_vfprintf(f, fmt, args); 2675 va_end(args); 2676 return len; 2677 } 2678 2679 ATTRIBUTE_PRINTF(2, 0) 2680 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2681 if (Arguments::vfprintf_hook() != NULL) { 2682 return Arguments::vfprintf_hook()(f, fmt, args); 2683 } else { 2684 return vfprintf(f, fmt, args); 2685 } 2686 } 2687 2688 ATTRIBUTE_PRINTF(1, 2) 2689 JNIEXPORT int jio_printf(const char *fmt, ...) { 2690 int len; 2691 va_list args; 2692 va_start(args, fmt); 2693 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2694 va_end(args); 2695 return len; 2696 } 2697 2698 // HotSpot specific jio method 2699 void jio_print(const char* s, size_t len) { 2700 // Try to make this function as atomic as possible. 2701 if (Arguments::vfprintf_hook() != NULL) { 2702 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2703 } else { 2704 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2705 size_t count = ::write(defaultStream::output_fd(), s, (int)len); 2706 } 2707 } 2708 2709 } // Extern C 2710 2711 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2712 2713 // In most of the JVM thread support functions we need to access the 2714 // thread through a ThreadsListHandle to prevent it from exiting and 2715 // being reclaimed while we try to operate on it. The exceptions to this 2716 // rule are when operating on the current thread, or if the monitor of 2717 // the target java.lang.Thread is locked at the Java level - in both 2718 // cases the target cannot exit. 2719 2720 static void thread_entry(JavaThread* thread, TRAPS) { 2721 HandleMark hm(THREAD); 2722 Handle obj(THREAD, thread->threadObj()); 2723 JavaValue result(T_VOID); 2724 JavaCalls::call_virtual(&result, 2725 obj, 2726 SystemDictionary::Thread_klass(), 2727 vmSymbols::run_method_name(), 2728 vmSymbols::void_method_signature(), 2729 THREAD); 2730 } 2731 2732 2733 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2734 JVMWrapper("JVM_StartThread"); 2735 JavaThread *native_thread = NULL; 2736 2737 // We cannot hold the Threads_lock when we throw an exception, 2738 // due to rank ordering issues. Example: we might need to grab the 2739 // Heap_lock while we construct the exception. 2740 bool throw_illegal_thread_state = false; 2741 2742 // We must release the Threads_lock before we can post a jvmti event 2743 // in Thread::start. 2744 { 2745 // Ensure that the C++ Thread and OSThread structures aren't freed before 2746 // we operate. 2747 MutexLocker mu(Threads_lock); 2748 2749 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2750 // re-starting an already started thread, so we should usually find 2751 // that the JavaThread is null. However for a JNI attached thread 2752 // there is a small window between the Thread object being created 2753 // (with its JavaThread set) and the update to its threadStatus, so we 2754 // have to check for this 2755 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2756 throw_illegal_thread_state = true; 2757 } else { 2758 // We could also check the stillborn flag to see if this thread was already stopped, but 2759 // for historical reasons we let the thread detect that itself when it starts running 2760 2761 jlong size = 2762 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2763 // Allocate the C++ Thread structure and create the native thread. The 2764 // stack size retrieved from java is 64-bit signed, but the constructor takes 2765 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2766 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2767 // - Avoid passing negative values which would result in really large stacks. 2768 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2769 size_t sz = size > 0 ? (size_t) size : 0; 2770 native_thread = new JavaThread(&thread_entry, sz); 2771 2772 // At this point it may be possible that no osthread was created for the 2773 // JavaThread due to lack of memory. Check for this situation and throw 2774 // an exception if necessary. Eventually we may want to change this so 2775 // that we only grab the lock if the thread was created successfully - 2776 // then we can also do this check and throw the exception in the 2777 // JavaThread constructor. 2778 if (native_thread->osthread() != NULL) { 2779 // Note: the current thread is not being used within "prepare". 2780 native_thread->prepare(jthread); 2781 } 2782 } 2783 } 2784 2785 if (throw_illegal_thread_state) { 2786 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2787 } 2788 2789 assert(native_thread != NULL, "Starting null thread?"); 2790 2791 if (native_thread->osthread() == NULL) { 2792 // No one should hold a reference to the 'native_thread'. 2793 native_thread->smr_delete(); 2794 if (JvmtiExport::should_post_resource_exhausted()) { 2795 JvmtiExport::post_resource_exhausted( 2796 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2797 os::native_thread_creation_failed_msg()); 2798 } 2799 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2800 os::native_thread_creation_failed_msg()); 2801 } 2802 2803 Thread::start(native_thread); 2804 2805 JVM_END 2806 2807 2808 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2809 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2810 // but is thought to be reliable and simple. In the case, where the receiver is the 2811 // same thread as the sender, no VM_Operation is needed. 2812 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2813 JVMWrapper("JVM_StopThread"); 2814 2815 // A nested ThreadsListHandle will grab the Threads_lock so create 2816 // tlh before we resolve throwable. 2817 ThreadsListHandle tlh(thread); 2818 oop java_throwable = JNIHandles::resolve(throwable); 2819 if (java_throwable == NULL) { 2820 THROW(vmSymbols::java_lang_NullPointerException()); 2821 } 2822 oop java_thread = NULL; 2823 JavaThread* receiver = NULL; 2824 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2825 Events::log_exception(thread, 2826 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2827 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2828 2829 if (is_alive) { 2830 // jthread refers to a live JavaThread. 2831 if (thread == receiver) { 2832 // Exception is getting thrown at self so no VM_Operation needed. 2833 THROW_OOP(java_throwable); 2834 } else { 2835 // Use a VM_Operation to throw the exception. 2836 Thread::send_async_exception(java_thread, java_throwable); 2837 } 2838 } else { 2839 // Either: 2840 // - target thread has not been started before being stopped, or 2841 // - target thread already terminated 2842 // We could read the threadStatus to determine which case it is 2843 // but that is overkill as it doesn't matter. We must set the 2844 // stillborn flag for the first case, and if the thread has already 2845 // exited setting this flag has no effect. 2846 java_lang_Thread::set_stillborn(java_thread); 2847 } 2848 JVM_END 2849 2850 2851 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2852 JVMWrapper("JVM_IsThreadAlive"); 2853 2854 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2855 return java_lang_Thread::is_alive(thread_oop); 2856 JVM_END 2857 2858 2859 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2860 JVMWrapper("JVM_SuspendThread"); 2861 2862 ThreadsListHandle tlh(thread); 2863 JavaThread* receiver = NULL; 2864 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2865 if (is_alive) { 2866 // jthread refers to a live JavaThread. 2867 { 2868 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2869 if (receiver->is_external_suspend()) { 2870 // Don't allow nested external suspend requests. We can't return 2871 // an error from this interface so just ignore the problem. 2872 return; 2873 } 2874 if (receiver->is_exiting()) { // thread is in the process of exiting 2875 return; 2876 } 2877 receiver->set_external_suspend(); 2878 } 2879 2880 // java_suspend() will catch threads in the process of exiting 2881 // and will ignore them. 2882 receiver->java_suspend(); 2883 2884 // It would be nice to have the following assertion in all the 2885 // time, but it is possible for a racing resume request to have 2886 // resumed this thread right after we suspended it. Temporarily 2887 // enable this assertion if you are chasing a different kind of 2888 // bug. 2889 // 2890 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2891 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2892 } 2893 JVM_END 2894 2895 2896 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2897 JVMWrapper("JVM_ResumeThread"); 2898 2899 ThreadsListHandle tlh(thread); 2900 JavaThread* receiver = NULL; 2901 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2902 if (is_alive) { 2903 // jthread refers to a live JavaThread. 2904 2905 // This is the original comment for this Threads_lock grab: 2906 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2907 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2908 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2909 // looks at it. 2910 // 2911 // The above comment dates back to when we had both internal and 2912 // external suspend APIs that shared a common underlying mechanism. 2913 // External suspend is now entirely cooperative and doesn't share 2914 // anything with internal suspend. That said, there are some 2915 // assumptions in the VM that an external resume grabs the 2916 // Threads_lock. We can't drop the Threads_lock grab here until we 2917 // resolve the assumptions that exist elsewhere. 2918 // 2919 MutexLocker ml(Threads_lock); 2920 receiver->java_resume(); 2921 } 2922 JVM_END 2923 2924 2925 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2926 JVMWrapper("JVM_SetThreadPriority"); 2927 2928 ThreadsListHandle tlh(thread); 2929 oop java_thread = NULL; 2930 JavaThread* receiver = NULL; 2931 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2932 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2933 2934 if (is_alive) { 2935 // jthread refers to a live JavaThread. 2936 Thread::set_priority(receiver, (ThreadPriority)prio); 2937 } 2938 // Implied else: If the JavaThread hasn't started yet, then the 2939 // priority set in the java.lang.Thread object above will be pushed 2940 // down when it does start. 2941 JVM_END 2942 2943 2944 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2945 JVMWrapper("JVM_Yield"); 2946 if (os::dont_yield()) return; 2947 HOTSPOT_THREAD_YIELD(); 2948 os::naked_yield(); 2949 JVM_END 2950 2951 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) { 2952 assert(event != NULL, "invariant"); 2953 assert(event->should_commit(), "invariant"); 2954 event->set_time(millis); 2955 event->commit(); 2956 } 2957 2958 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2959 JVMWrapper("JVM_Sleep"); 2960 2961 if (millis < 0) { 2962 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2963 } 2964 2965 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2966 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2967 } 2968 2969 // Save current thread state and restore it at the end of this block. 2970 // And set new thread state to SLEEPING. 2971 JavaThreadSleepState jtss(thread); 2972 2973 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 2974 EventThreadSleep event; 2975 2976 if (millis == 0) { 2977 os::naked_yield(); 2978 } else { 2979 ThreadState old_state = thread->osthread()->get_state(); 2980 thread->osthread()->set_state(SLEEPING); 2981 if (os::sleep(thread, millis, true) == OS_INTRPT) { 2982 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 2983 // us while we were sleeping. We do not overwrite those. 2984 if (!HAS_PENDING_EXCEPTION) { 2985 if (event.should_commit()) { 2986 post_thread_sleep_event(&event, millis); 2987 } 2988 HOTSPOT_THREAD_SLEEP_END(1); 2989 2990 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 2991 // to properly restore the thread state. That's likely wrong. 2992 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2993 } 2994 } 2995 thread->osthread()->set_state(old_state); 2996 } 2997 if (event.should_commit()) { 2998 post_thread_sleep_event(&event, millis); 2999 } 3000 HOTSPOT_THREAD_SLEEP_END(0); 3001 JVM_END 3002 3003 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3004 JVMWrapper("JVM_CurrentThread"); 3005 oop jthread = thread->threadObj(); 3006 assert (thread != NULL, "no current thread!"); 3007 return JNIHandles::make_local(env, jthread); 3008 JVM_END 3009 3010 class CountStackFramesTC : public ThreadClosure { 3011 int _count; 3012 bool _suspended; 3013 public: 3014 CountStackFramesTC() : _count(0), _suspended(false) {} 3015 virtual void do_thread(Thread* thread) { 3016 JavaThread* jt = (JavaThread*)thread; 3017 if (!jt->is_external_suspend()) { 3018 // To keep same behavior we fail this operation, 3019 // even if it would work perfectly. 3020 return; 3021 } 3022 _suspended = true; 3023 // Count all java activation, i.e., number of vframes. 3024 for (vframeStream vfst(jt); !vfst.at_end(); vfst.next()) { 3025 // Native frames are not counted. 3026 if (!vfst.method()->is_native()) _count++; 3027 } 3028 } 3029 int count() { return _count; } 3030 int suspended() { return _suspended; } 3031 }; 3032 3033 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3034 JVMWrapper("JVM_CountStackFrames"); 3035 3036 ThreadsListHandle tlh(thread); 3037 JavaThread* receiver = NULL; 3038 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3039 if (is_alive) { 3040 // jthread refers to a live JavaThread. 3041 CountStackFramesTC csf; 3042 Handshake::execute(&csf, receiver); 3043 if (!csf.suspended()) { 3044 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3045 "this thread is not suspended"); 3046 } 3047 return csf.count(); 3048 } 3049 // Implied else: if JavaThread is not alive simply return a count of 0. 3050 return 0; 3051 JVM_END 3052 3053 3054 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3055 JVMWrapper("JVM_Interrupt"); 3056 3057 ThreadsListHandle tlh(thread); 3058 JavaThread* receiver = NULL; 3059 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3060 if (is_alive) { 3061 // jthread refers to a live JavaThread. 3062 Thread::interrupt(receiver); 3063 } 3064 JVM_END 3065 3066 3067 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3068 JVMWrapper("JVM_IsInterrupted"); 3069 3070 ThreadsListHandle tlh(thread); 3071 JavaThread* receiver = NULL; 3072 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3073 if (is_alive) { 3074 // jthread refers to a live JavaThread. 3075 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0); 3076 } else { 3077 return JNI_FALSE; 3078 } 3079 JVM_END 3080 3081 3082 // Return true iff the current thread has locked the object passed in 3083 3084 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3085 JVMWrapper("JVM_HoldsLock"); 3086 assert(THREAD->is_Java_thread(), "sanity check"); 3087 if (obj == NULL) { 3088 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3089 } 3090 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3091 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3092 JVM_END 3093 3094 3095 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3096 JVMWrapper("JVM_DumpAllStacks"); 3097 VM_PrintThreads op; 3098 VMThread::execute(&op); 3099 if (JvmtiExport::should_post_data_dump()) { 3100 JvmtiExport::post_data_dump(); 3101 } 3102 JVM_END 3103 3104 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3105 JVMWrapper("JVM_SetNativeThreadName"); 3106 3107 // We don't use a ThreadsListHandle here because the current thread 3108 // must be alive. 3109 oop java_thread = JNIHandles::resolve_non_null(jthread); 3110 JavaThread* thr = java_lang_Thread::thread(java_thread); 3111 if (thread == thr && !thr->has_attached_via_jni()) { 3112 // Thread naming is only supported for the current thread and 3113 // we don't set the name of an attached thread to avoid stepping 3114 // on other programs. 3115 ResourceMark rm(thread); 3116 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3117 os::set_native_thread_name(thread_name); 3118 } 3119 JVM_END 3120 3121 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3122 3123 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3124 JVMWrapper("JVM_GetClassContext"); 3125 ResourceMark rm(THREAD); 3126 JvmtiVMObjectAllocEventCollector oam; 3127 vframeStream vfst(thread); 3128 3129 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3130 // This must only be called from SecurityManager.getClassContext 3131 Method* m = vfst.method(); 3132 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3133 m->name() == vmSymbols::getClassContext_name() && 3134 m->signature() == vmSymbols::void_class_array_signature())) { 3135 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3136 } 3137 } 3138 3139 // Collect method holders 3140 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3141 for (; !vfst.at_end(); vfst.security_next()) { 3142 Method* m = vfst.method(); 3143 // Native frames are not returned 3144 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3145 Klass* holder = m->method_holder(); 3146 assert(holder->is_klass(), "just checking"); 3147 klass_array->append(holder); 3148 } 3149 } 3150 3151 // Create result array of type [Ljava/lang/Class; 3152 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3153 // Fill in mirrors corresponding to method holders 3154 for (int i = 0; i < klass_array->length(); i++) { 3155 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3156 } 3157 3158 return (jobjectArray) JNIHandles::make_local(env, result); 3159 JVM_END 3160 3161 3162 // java.lang.Package //////////////////////////////////////////////////////////////// 3163 3164 3165 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3166 JVMWrapper("JVM_GetSystemPackage"); 3167 ResourceMark rm(THREAD); 3168 JvmtiVMObjectAllocEventCollector oam; 3169 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3170 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3171 return (jstring) JNIHandles::make_local(result); 3172 JVM_END 3173 3174 3175 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3176 JVMWrapper("JVM_GetSystemPackages"); 3177 JvmtiVMObjectAllocEventCollector oam; 3178 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3179 return (jobjectArray) JNIHandles::make_local(result); 3180 JVM_END 3181 3182 3183 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3184 3185 3186 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3187 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3188 3189 MonitorLocker ml(Heap_lock); 3190 oop ref = Universe::reference_pending_list(); 3191 if (ref != NULL) { 3192 Universe::set_reference_pending_list(NULL); 3193 } 3194 return JNIHandles::make_local(env, ref); 3195 JVM_END 3196 3197 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3198 JVMWrapper("JVM_HasReferencePendingList"); 3199 MonitorLocker ml(Heap_lock); 3200 return Universe::has_reference_pending_list(); 3201 JVM_END 3202 3203 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3204 JVMWrapper("JVM_WaitForReferencePendingList"); 3205 MonitorLocker ml(Heap_lock); 3206 while (!Universe::has_reference_pending_list()) { 3207 ml.wait(); 3208 } 3209 JVM_END 3210 3211 3212 // ObjectInputStream /////////////////////////////////////////////////////////////// 3213 3214 // Return the first user-defined class loader up the execution stack, or null 3215 // if only code from the bootstrap or platform class loader is on the stack. 3216 3217 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3218 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3219 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3220 oop loader = vfst.method()->method_holder()->class_loader(); 3221 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3222 return JNIHandles::make_local(env, loader); 3223 } 3224 } 3225 return NULL; 3226 JVM_END 3227 3228 3229 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3230 3231 3232 // resolve array handle and check arguments 3233 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3234 if (arr == NULL) { 3235 THROW_0(vmSymbols::java_lang_NullPointerException()); 3236 } 3237 oop a = JNIHandles::resolve_non_null(arr); 3238 if (!a->is_array()) { 3239 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3240 } else if (type_array_only && !a->is_typeArray()) { 3241 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3242 } 3243 return arrayOop(a); 3244 } 3245 3246 3247 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3248 JVMWrapper("JVM_GetArrayLength"); 3249 arrayOop a = check_array(env, arr, false, CHECK_0); 3250 return a->length(); 3251 JVM_END 3252 3253 3254 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3255 JVMWrapper("JVM_Array_Get"); 3256 JvmtiVMObjectAllocEventCollector oam; 3257 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3258 jvalue value; 3259 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3260 oop box = Reflection::box(&value, type, CHECK_NULL); 3261 return JNIHandles::make_local(env, box); 3262 JVM_END 3263 3264 3265 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3266 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3267 jvalue value; 3268 value.i = 0; // to initialize value before getting used in CHECK 3269 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3270 assert(a->is_typeArray(), "just checking"); 3271 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3272 BasicType wide_type = (BasicType) wCode; 3273 if (type != wide_type) { 3274 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3275 } 3276 return value; 3277 JVM_END 3278 3279 3280 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3281 JVMWrapper("JVM_SetArrayElement"); 3282 arrayOop a = check_array(env, arr, false, CHECK); 3283 oop box = JNIHandles::resolve(val); 3284 jvalue value; 3285 value.i = 0; // to initialize value before getting used in CHECK 3286 BasicType value_type; 3287 if (a->is_objArray()) { 3288 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3289 value_type = Reflection::unbox_for_regular_object(box, &value); 3290 } else { 3291 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3292 } 3293 Reflection::array_set(&value, a, index, value_type, CHECK); 3294 JVM_END 3295 3296 3297 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3298 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3299 arrayOop a = check_array(env, arr, true, CHECK); 3300 assert(a->is_typeArray(), "just checking"); 3301 BasicType value_type = (BasicType) vCode; 3302 Reflection::array_set(&v, a, index, value_type, CHECK); 3303 JVM_END 3304 3305 3306 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3307 JVMWrapper("JVM_NewArray"); 3308 JvmtiVMObjectAllocEventCollector oam; 3309 oop element_mirror = JNIHandles::resolve(eltClass); 3310 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3311 return JNIHandles::make_local(env, result); 3312 JVM_END 3313 3314 3315 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3316 JVMWrapper("JVM_NewMultiArray"); 3317 JvmtiVMObjectAllocEventCollector oam; 3318 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3319 oop element_mirror = JNIHandles::resolve(eltClass); 3320 assert(dim_array->is_typeArray(), "just checking"); 3321 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3322 return JNIHandles::make_local(env, result); 3323 JVM_END 3324 3325 3326 // Library support /////////////////////////////////////////////////////////////////////////// 3327 3328 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3329 //%note jvm_ct 3330 JVMWrapper("JVM_LoadLibrary"); 3331 char ebuf[1024]; 3332 void *load_result; 3333 { 3334 ThreadToNativeFromVM ttnfvm(thread); 3335 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3336 } 3337 if (load_result == NULL) { 3338 char msg[1024]; 3339 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3340 // Since 'ebuf' may contain a string encoded using 3341 // platform encoding scheme, we need to pass 3342 // Exceptions::unsafe_to_utf8 to the new_exception method 3343 // as the last argument. See bug 6367357. 3344 Handle h_exception = 3345 Exceptions::new_exception(thread, 3346 vmSymbols::java_lang_UnsatisfiedLinkError(), 3347 msg, Exceptions::unsafe_to_utf8); 3348 3349 THROW_HANDLE_0(h_exception); 3350 } 3351 return load_result; 3352 JVM_END 3353 3354 3355 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3356 JVMWrapper("JVM_UnloadLibrary"); 3357 os::dll_unload(handle); 3358 JVM_END 3359 3360 3361 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3362 JVMWrapper("JVM_FindLibraryEntry"); 3363 return os::dll_lookup(handle, name); 3364 JVM_END 3365 3366 3367 // JNI version /////////////////////////////////////////////////////////////////////////////// 3368 3369 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3370 JVMWrapper("JVM_IsSupportedJNIVersion"); 3371 return Threads::is_supported_jni_version_including_1_1(version); 3372 JVM_END 3373 3374 3375 // String support /////////////////////////////////////////////////////////////////////////// 3376 3377 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3378 JVMWrapper("JVM_InternString"); 3379 JvmtiVMObjectAllocEventCollector oam; 3380 if (str == NULL) return NULL; 3381 oop string = JNIHandles::resolve_non_null(str); 3382 oop result = StringTable::intern(string, CHECK_NULL); 3383 return (jstring) JNIHandles::make_local(env, result); 3384 JVM_END 3385 3386 3387 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3388 3389 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3390 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3391 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3392 // that only works with java threads. 3393 3394 3395 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3396 VM_Exit::block_if_vm_exited(); 3397 JVMWrapper("JVM_RawMonitorCreate"); 3398 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3399 } 3400 3401 3402 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3403 VM_Exit::block_if_vm_exited(); 3404 JVMWrapper("JVM_RawMonitorDestroy"); 3405 delete ((Mutex*) mon); 3406 } 3407 3408 3409 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3410 VM_Exit::block_if_vm_exited(); 3411 JVMWrapper("JVM_RawMonitorEnter"); 3412 ((Mutex*) mon)->jvm_raw_lock(); 3413 return 0; 3414 } 3415 3416 3417 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3418 VM_Exit::block_if_vm_exited(); 3419 JVMWrapper("JVM_RawMonitorExit"); 3420 ((Mutex*) mon)->jvm_raw_unlock(); 3421 } 3422 3423 3424 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3425 3426 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3427 Handle loader, Handle protection_domain, 3428 jboolean throwError, TRAPS) { 3429 // Security Note: 3430 // The Java level wrapper will perform the necessary security check allowing 3431 // us to pass the NULL as the initiating class loader. The VM is responsible for 3432 // the checkPackageAccess relative to the initiating class loader via the 3433 // protection_domain. The protection_domain is passed as NULL by the java code 3434 // if there is no security manager in 3-arg Class.forName(). 3435 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3436 3437 // Check if we should initialize the class 3438 if (init && klass->is_instance_klass()) { 3439 klass->initialize(CHECK_NULL); 3440 } 3441 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3442 } 3443 3444 3445 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3446 3447 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3448 JVMWrapper("JVM_InvokeMethod"); 3449 Handle method_handle; 3450 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3451 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3452 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3453 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3454 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3455 jobject res = JNIHandles::make_local(env, result); 3456 if (JvmtiExport::should_post_vm_object_alloc()) { 3457 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3458 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3459 if (java_lang_Class::is_primitive(ret_type)) { 3460 // Only for primitive type vm allocates memory for java object. 3461 // See box() method. 3462 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3463 } 3464 } 3465 return res; 3466 } else { 3467 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3468 } 3469 JVM_END 3470 3471 3472 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3473 JVMWrapper("JVM_NewInstanceFromConstructor"); 3474 oop constructor_mirror = JNIHandles::resolve(c); 3475 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3476 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3477 jobject res = JNIHandles::make_local(env, result); 3478 if (JvmtiExport::should_post_vm_object_alloc()) { 3479 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3480 } 3481 return res; 3482 JVM_END 3483 3484 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3485 3486 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3487 JVMWrapper("JVM_SupportsCX8"); 3488 return VM_Version::supports_cx8(); 3489 JVM_END 3490 3491 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3492 JVMWrapper("JVM_InitializeFromArchive"); 3493 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3494 assert(k->is_klass(), "just checking"); 3495 HeapShared::initialize_from_archived_subgraph(k); 3496 JVM_END 3497 3498 // Returns an array of all live Thread objects (VM internal JavaThreads, 3499 // jvmti agent threads, and JNI attaching threads are skipped) 3500 // See CR 6404306 regarding JNI attaching threads 3501 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3502 ResourceMark rm(THREAD); 3503 ThreadsListEnumerator tle(THREAD, false, false); 3504 JvmtiVMObjectAllocEventCollector oam; 3505 3506 int num_threads = tle.num_threads(); 3507 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3508 objArrayHandle threads_ah(THREAD, r); 3509 3510 for (int i = 0; i < num_threads; i++) { 3511 Handle h = tle.get_threadObj(i); 3512 threads_ah->obj_at_put(i, h()); 3513 } 3514 3515 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3516 JVM_END 3517 3518 3519 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3520 // Return StackTraceElement[][], each element is the stack trace of a thread in 3521 // the corresponding entry in the given threads array 3522 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3523 JVMWrapper("JVM_DumpThreads"); 3524 JvmtiVMObjectAllocEventCollector oam; 3525 3526 // Check if threads is null 3527 if (threads == NULL) { 3528 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3529 } 3530 3531 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3532 objArrayHandle ah(THREAD, a); 3533 int num_threads = ah->length(); 3534 // check if threads is non-empty array 3535 if (num_threads == 0) { 3536 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3537 } 3538 3539 // check if threads is not an array of objects of Thread class 3540 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3541 if (k != SystemDictionary::Thread_klass()) { 3542 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3543 } 3544 3545 ResourceMark rm(THREAD); 3546 3547 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3548 for (int i = 0; i < num_threads; i++) { 3549 oop thread_obj = ah->obj_at(i); 3550 instanceHandle h(THREAD, (instanceOop) thread_obj); 3551 thread_handle_array->append(h); 3552 } 3553 3554 // The JavaThread references in thread_handle_array are validated 3555 // in VM_ThreadDump::doit(). 3556 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3557 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3558 3559 JVM_END 3560 3561 // JVM monitoring and management support 3562 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3563 return Management::get_jmm_interface(version); 3564 JVM_END 3565 3566 // com.sun.tools.attach.VirtualMachine agent properties support 3567 // 3568 // Initialize the agent properties with the properties maintained in the VM 3569 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3570 JVMWrapper("JVM_InitAgentProperties"); 3571 ResourceMark rm; 3572 3573 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3574 3575 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3576 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3577 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3578 return properties; 3579 JVM_END 3580 3581 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3582 { 3583 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3584 JvmtiVMObjectAllocEventCollector oam; 3585 3586 if (ofClass == NULL) { 3587 return NULL; 3588 } 3589 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3590 // Special handling for primitive objects 3591 if (java_lang_Class::is_primitive(mirror())) { 3592 return NULL; 3593 } 3594 Klass* k = java_lang_Class::as_Klass(mirror()); 3595 if (!k->is_instance_klass()) { 3596 return NULL; 3597 } 3598 InstanceKlass* ik = InstanceKlass::cast(k); 3599 int encl_method_class_idx = ik->enclosing_method_class_index(); 3600 if (encl_method_class_idx == 0) { 3601 return NULL; 3602 } 3603 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3604 objArrayHandle dest(THREAD, dest_o); 3605 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3606 dest->obj_at_put(0, enc_k->java_mirror()); 3607 int encl_method_method_idx = ik->enclosing_method_method_index(); 3608 if (encl_method_method_idx != 0) { 3609 Symbol* sym = ik->constants()->symbol_at( 3610 extract_low_short_from_int( 3611 ik->constants()->name_and_type_at(encl_method_method_idx))); 3612 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3613 dest->obj_at_put(1, str()); 3614 sym = ik->constants()->symbol_at( 3615 extract_high_short_from_int( 3616 ik->constants()->name_and_type_at(encl_method_method_idx))); 3617 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3618 dest->obj_at_put(2, str()); 3619 } 3620 return (jobjectArray) JNIHandles::make_local(dest()); 3621 } 3622 JVM_END 3623 3624 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3625 { 3626 memset(info, 0, info_size); 3627 3628 info->jvm_version = VM_Version::jvm_version(); 3629 info->patch_version = VM_Version::vm_patch_version(); 3630 3631 // when we add a new capability in the jvm_version_info struct, we should also 3632 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3633 // counter defined in runtimeService.cpp. 3634 info->is_attach_supported = AttachListener::is_attach_supported(); 3635 } 3636 JVM_END 3637 3638 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3639 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3640 ResourceMark rm(THREAD); 3641 3642 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3643 return NULL; 3644 } 3645 3646 char** vm_flags = Arguments::jvm_flags_array(); 3647 char** vm_args = Arguments::jvm_args_array(); 3648 int num_flags = Arguments::num_jvm_flags(); 3649 int num_args = Arguments::num_jvm_args(); 3650 3651 InstanceKlass* ik = SystemDictionary::String_klass(); 3652 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3653 objArrayHandle result_h(THREAD, r); 3654 3655 int index = 0; 3656 for (int j = 0; j < num_flags; j++, index++) { 3657 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3658 result_h->obj_at_put(index, h()); 3659 } 3660 for (int i = 0; i < num_args; i++, index++) { 3661 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3662 result_h->obj_at_put(index, h()); 3663 } 3664 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3665 JVM_END 3666 3667 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3668 return os::get_signal_number(name); 3669 JVM_END