1 /* 2 * Copyright (c) 1997, 2015, 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 "classfile/classFileStream.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/javaAssertions.hpp" 29 #include "classfile/javaClasses.inline.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "classfile/vmSymbols.hpp" 33 #include "gc/shared/barrierSet.inline.hpp" 34 #include "gc/shared/collectedHeap.inline.hpp" 35 #include "interpreter/bytecode.hpp" 36 #include "memory/oopFactory.hpp" 37 #include "memory/universe.inline.hpp" 38 #include "oops/fieldStreams.hpp" 39 #include "oops/instanceKlass.hpp" 40 #include "oops/method.hpp" 41 #include "oops/objArrayKlass.hpp" 42 #include "oops/objArrayOop.inline.hpp" 43 #include "oops/oop.inline.hpp" 44 #include "prims/jvm.h" 45 #include "prims/jvm_misc.hpp" 46 #include "prims/jvmtiExport.hpp" 47 #include "prims/jvmtiThreadState.hpp" 48 #include "prims/nativeLookup.hpp" 49 #include "prims/privilegedStack.hpp" 50 #include "prims/stackwalk.hpp" 51 #include "runtime/arguments.hpp" 52 #include "runtime/atomic.inline.hpp" 53 #include "runtime/handles.inline.hpp" 54 #include "runtime/init.hpp" 55 #include "runtime/interfaceSupport.hpp" 56 #include "runtime/java.hpp" 57 #include "runtime/javaCalls.hpp" 58 #include "runtime/jfieldIDWorkaround.hpp" 59 #include "runtime/orderAccess.inline.hpp" 60 #include "runtime/os.inline.hpp" 61 #include "runtime/perfData.hpp" 62 #include "runtime/reflection.hpp" 63 #include "runtime/thread.inline.hpp" 64 #include "runtime/vframe.hpp" 65 #include "runtime/vm_operations.hpp" 66 #include "runtime/vm_version.hpp" 67 #include "services/attachListener.hpp" 68 #include "services/management.hpp" 69 #include "services/threadService.hpp" 70 #include "trace/tracing.hpp" 71 #include "utilities/copy.hpp" 72 #include "utilities/defaultStream.hpp" 73 #include "utilities/dtrace.hpp" 74 #include "utilities/events.hpp" 75 #include "utilities/histogram.hpp" 76 #include "utilities/macros.hpp" 77 #include "utilities/top.hpp" 78 #include "utilities/utf8.hpp" 79 #if INCLUDE_CDS 80 #include "classfile/sharedClassUtil.hpp" 81 #include "classfile/systemDictionaryShared.hpp" 82 #endif 83 #ifdef TARGET_OS_FAMILY_linux 84 # include "jvm_linux.h" 85 #endif 86 #ifdef TARGET_OS_FAMILY_solaris 87 # include "jvm_solaris.h" 88 #endif 89 #ifdef TARGET_OS_FAMILY_windows 90 # include "jvm_windows.h" 91 #endif 92 #ifdef TARGET_OS_FAMILY_aix 93 # include "jvm_aix.h" 94 #endif 95 #ifdef TARGET_OS_FAMILY_bsd 96 # include "jvm_bsd.h" 97 #endif 98 99 #include <errno.h> 100 101 /* 102 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 103 such ctors and calls MUST NOT come between an oop declaration/init and its 104 usage because if objects are move this may cause various memory stomps, bus 105 errors and segfaults. Here is a cookbook for causing so called "naked oop 106 failures": 107 108 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 109 JVMWrapper("JVM_GetClassDeclaredFields"); 110 111 // Object address to be held directly in mirror & not visible to GC 112 oop mirror = JNIHandles::resolve_non_null(ofClass); 113 114 // If this ctor can hit a safepoint, moving objects around, then 115 ComplexConstructor foo; 116 117 // Boom! mirror may point to JUNK instead of the intended object 118 (some dereference of mirror) 119 120 // Here's another call that may block for GC, making mirror stale 121 MutexLocker ml(some_lock); 122 123 // And here's an initializer that can result in a stale oop 124 // all in one step. 125 oop o = call_that_can_throw_exception(TRAPS); 126 127 128 The solution is to keep the oop declaration BELOW the ctor or function 129 call that might cause a GC, do another resolve to reassign the oop, or 130 consider use of a Handle instead of an oop so there is immunity from object 131 motion. But note that the "QUICK" entries below do not have a handlemark 132 and thus can only support use of handles passed in. 133 */ 134 135 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 136 ResourceMark rm; 137 int line_number = -1; 138 const char * source_file = NULL; 139 const char * trace = "explicit"; 140 InstanceKlass* caller = NULL; 141 JavaThread* jthread = JavaThread::current(); 142 if (jthread->has_last_Java_frame()) { 143 vframeStream vfst(jthread); 144 145 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 146 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 147 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 148 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 149 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 150 151 Method* last_caller = NULL; 152 153 while (!vfst.at_end()) { 154 Method* m = vfst.method(); 155 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 156 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 157 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 158 break; 159 } 160 last_caller = m; 161 vfst.next(); 162 } 163 // if this is called from Class.forName0 and that is called from Class.forName, 164 // then print the caller of Class.forName. If this is Class.loadClass, then print 165 // that caller, otherwise keep quiet since this should be picked up elsewhere. 166 bool found_it = false; 167 if (!vfst.at_end() && 168 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 169 vfst.method()->name() == vmSymbols::forName0_name()) { 170 vfst.next(); 171 if (!vfst.at_end() && 172 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 173 vfst.method()->name() == vmSymbols::forName_name()) { 174 vfst.next(); 175 found_it = true; 176 } 177 } else if (last_caller != NULL && 178 last_caller->method_holder()->name() == 179 vmSymbols::java_lang_ClassLoader() && 180 (last_caller->name() == vmSymbols::loadClassInternal_name() || 181 last_caller->name() == vmSymbols::loadClass_name())) { 182 found_it = true; 183 } else if (!vfst.at_end()) { 184 if (vfst.method()->is_native()) { 185 // JNI call 186 found_it = true; 187 } 188 } 189 if (found_it && !vfst.at_end()) { 190 // found the caller 191 caller = vfst.method()->method_holder(); 192 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 193 if (line_number == -1) { 194 // show method name if it's a native method 195 trace = vfst.method()->name_and_sig_as_C_string(); 196 } 197 Symbol* s = caller->source_file_name(); 198 if (s != NULL) { 199 source_file = s->as_C_string(); 200 } 201 } 202 } 203 if (caller != NULL) { 204 if (to_class != caller) { 205 const char * from = caller->external_name(); 206 const char * to = to_class->external_name(); 207 // print in a single call to reduce interleaving between threads 208 if (source_file != NULL) { 209 log_info(classresolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 210 } else { 211 log_info(classresolve)("%s %s (%s)", from, to, trace); 212 } 213 } 214 } 215 } 216 217 void trace_class_resolution(Klass* to_class) { 218 EXCEPTION_MARK; 219 trace_class_resolution_impl(to_class, THREAD); 220 if (HAS_PENDING_EXCEPTION) { 221 CLEAR_PENDING_EXCEPTION; 222 } 223 } 224 225 // Wrapper to trace JVM functions 226 227 #ifdef ASSERT 228 Histogram* JVMHistogram; 229 volatile jint JVMHistogram_lock = 0; 230 231 class JVMHistogramElement : public HistogramElement { 232 public: 233 JVMHistogramElement(const char* name); 234 }; 235 236 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 237 _name = elementName; 238 uintx count = 0; 239 240 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 241 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 242 count +=1; 243 if ( (WarnOnStalledSpinLock > 0) 244 && (count % WarnOnStalledSpinLock == 0)) { 245 warning("JVMHistogram_lock seems to be stalled"); 246 } 247 } 248 } 249 250 if(JVMHistogram == NULL) 251 JVMHistogram = new Histogram("JVM Call Counts",100); 252 253 JVMHistogram->add_element(this); 254 Atomic::dec(&JVMHistogram_lock); 255 } 256 257 #define JVMCountWrapper(arg) \ 258 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 259 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 260 261 #define JVMWrapper(arg) JVMCountWrapper(arg); 262 #else 263 #define JVMWrapper(arg) 264 #endif 265 266 267 // Interface version ///////////////////////////////////////////////////////////////////// 268 269 270 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 271 return JVM_INTERFACE_VERSION; 272 JVM_END 273 274 275 // java.lang.System ////////////////////////////////////////////////////////////////////// 276 277 278 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 279 JVMWrapper("JVM_CurrentTimeMillis"); 280 return os::javaTimeMillis(); 281 JVM_END 282 283 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 284 JVMWrapper("JVM_NanoTime"); 285 return os::javaTimeNanos(); 286 JVM_END 287 288 // The function below is actually exposed by jdk.internal.misc.VM and not 289 // java.lang.System, but we choose to keep it here so that it stays next 290 // to JVM_CurrentTimeMillis and JVM_NanoTime 291 292 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 293 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 294 295 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 296 JVMWrapper("JVM_GetNanoTimeAdjustment"); 297 jlong seconds; 298 jlong nanos; 299 300 os::javaTimeSystemUTC(seconds, nanos); 301 302 // We're going to verify that the result can fit in a long. 303 // For that we need the difference in seconds between 'seconds' 304 // and 'offset_secs' to be such that: 305 // |seconds - offset_secs| < (2^63/10^9) 306 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 307 // which makes |seconds - offset_secs| < 2^33 308 // and we will prefer +/- 2^32 as the maximum acceptable diff 309 // as 2^32 has a more natural feel than 2^33... 310 // 311 // So if |seconds - offset_secs| >= 2^32 - we return a special 312 // sentinel value (-1) which the caller should take as an 313 // exception value indicating that the offset given to us is 314 // too far from range of the current time - leading to too big 315 // a nano adjustment. The caller is expected to recover by 316 // computing a more accurate offset and calling this method 317 // again. (For the record 2^32 secs is ~136 years, so that 318 // should rarely happen) 319 // 320 jlong diff = seconds - offset_secs; 321 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 322 return -1; // sentinel value: the offset is too far off the target 323 } 324 325 // return the adjustment. If you compute a time by adding 326 // this number of nanoseconds along with the number of seconds 327 // in the offset you should get the current UTC time. 328 return (diff * (jlong)1000000000) + nanos; 329 JVM_END 330 331 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 332 jobject dst, jint dst_pos, jint length)) 333 JVMWrapper("JVM_ArrayCopy"); 334 // Check if we have null pointers 335 if (src == NULL || dst == NULL) { 336 THROW(vmSymbols::java_lang_NullPointerException()); 337 } 338 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 339 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 340 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop"); 341 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop"); 342 // Do copy 343 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 344 JVM_END 345 346 347 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 348 JavaValue r(T_OBJECT); 349 // public synchronized Object put(Object key, Object value); 350 HandleMark hm(THREAD); 351 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 352 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 353 JavaCalls::call_virtual(&r, 354 props, 355 KlassHandle(THREAD, SystemDictionary::Properties_klass()), 356 vmSymbols::put_name(), 357 vmSymbols::object_object_object_signature(), 358 key_str, 359 value_str, 360 THREAD); 361 } 362 363 364 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 365 366 367 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 368 JVMWrapper("JVM_InitProperties"); 369 ResourceMark rm; 370 371 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 372 373 // System property list includes both user set via -D option and 374 // jvm system specific properties. 375 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 376 PUTPROP(props, p->key(), p->value()); 377 } 378 379 // Convert the -XX:MaxDirectMemorySize= command line flag 380 // to the sun.nio.MaxDirectMemorySize property. 381 // Do this after setting user properties to prevent people 382 // from setting the value with a -D option, as requested. 383 { 384 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 385 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 386 } else { 387 char as_chars[256]; 388 jio_snprintf(as_chars, sizeof(as_chars), SIZE_FORMAT, MaxDirectMemorySize); 389 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 390 } 391 } 392 393 // JVM monitoring and management support 394 // Add the sun.management.compiler property for the compiler's name 395 { 396 #undef CSIZE 397 #if defined(_LP64) || defined(_WIN64) 398 #define CSIZE "64-Bit " 399 #else 400 #define CSIZE 401 #endif // 64bit 402 403 #ifdef TIERED 404 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 405 #else 406 #if defined(COMPILER1) 407 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 408 #elif defined(COMPILER2) 409 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 410 #elif INCLUDE_JVMCI 411 #error "INCLUDE_JVMCI should imply TIERED" 412 #else 413 const char* compiler_name = ""; 414 #endif // compilers 415 #endif // TIERED 416 417 if (*compiler_name != '\0' && 418 (Arguments::mode() != Arguments::_int)) { 419 PUTPROP(props, "sun.management.compiler", compiler_name); 420 } 421 } 422 423 return properties; 424 JVM_END 425 426 427 /* 428 * Return the temporary directory that the VM uses for the attach 429 * and perf data files. 430 * 431 * It is important that this directory is well-known and the 432 * same for all VM instances. It cannot be affected by configuration 433 * variables such as java.io.tmpdir. 434 */ 435 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 436 JVMWrapper("JVM_GetTemporaryDirectory"); 437 HandleMark hm(THREAD); 438 const char* temp_dir = os::get_temp_directory(); 439 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 440 return (jstring) JNIHandles::make_local(env, h()); 441 JVM_END 442 443 444 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 445 446 extern volatile jint vm_created; 447 448 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 449 before_exit(thread); 450 vm_exit(code); 451 JVM_END 452 453 454 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 455 JVMWrapper("JVM_GC"); 456 if (!DisableExplicitGC) { 457 Universe::heap()->collect(GCCause::_java_lang_system_gc); 458 } 459 JVM_END 460 461 462 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 463 JVMWrapper("JVM_MaxObjectInspectionAge"); 464 return Universe::heap()->millis_since_last_gc(); 465 JVM_END 466 467 468 static inline jlong convert_size_t_to_jlong(size_t val) { 469 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 470 NOT_LP64 (return (jlong)val;) 471 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 472 } 473 474 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 475 JVMWrapper("JVM_TotalMemory"); 476 size_t n = Universe::heap()->capacity(); 477 return convert_size_t_to_jlong(n); 478 JVM_END 479 480 481 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 482 JVMWrapper("JVM_FreeMemory"); 483 CollectedHeap* ch = Universe::heap(); 484 size_t n; 485 { 486 MutexLocker x(Heap_lock); 487 n = ch->capacity() - ch->used(); 488 } 489 return convert_size_t_to_jlong(n); 490 JVM_END 491 492 493 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 494 JVMWrapper("JVM_MaxMemory"); 495 size_t n = Universe::heap()->max_capacity(); 496 return convert_size_t_to_jlong(n); 497 JVM_END 498 499 500 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 501 JVMWrapper("JVM_ActiveProcessorCount"); 502 return os::active_processor_count(); 503 JVM_END 504 505 506 507 // java.lang.Throwable ////////////////////////////////////////////////////// 508 509 510 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 511 JVMWrapper("JVM_FillInStackTrace"); 512 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 513 java_lang_Throwable::fill_in_stack_trace(exception); 514 JVM_END 515 516 517 JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable)) 518 JVMWrapper("JVM_GetStackTraceDepth"); 519 oop exception = JNIHandles::resolve(throwable); 520 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD); 521 JVM_END 522 523 524 JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index)) 525 JVMWrapper("JVM_GetStackTraceElement"); 526 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC 527 oop exception = JNIHandles::resolve(throwable); 528 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL); 529 return JNIHandles::make_local(env, element); 530 JVM_END 531 532 533 // java.lang.StackWalker ////////////////////////////////////////////////////// 534 535 536 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 537 jint skip_frames, jint frame_count, jint start_index, 538 jobjectArray classes, 539 jobjectArray frames)) 540 JVMWrapper("JVM_CallStackWalk"); 541 JavaThread* jt = (JavaThread*) THREAD; 542 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 543 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 544 } 545 546 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 547 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(classes)); 548 objArrayHandle classes_array_h(THREAD, ca); 549 550 // frames array is null when only getting caller reference 551 objArrayOop fa = objArrayOop(JNIHandles::resolve(frames)); 552 objArrayHandle frames_array_h(THREAD, fa); 553 554 int limit = start_index + frame_count; 555 if (classes_array_h->length() < limit) { 556 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 557 } 558 559 Handle result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 560 start_index, classes_array_h, 561 frames_array_h, CHECK_NULL); 562 return JNIHandles::make_local(env, result()); 563 JVM_END 564 565 566 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 567 jint frame_count, jint start_index, 568 jobjectArray classes, 569 jobjectArray frames)) 570 JVMWrapper("JVM_MoreStackWalk"); 571 JavaThread* jt = (JavaThread*) THREAD; 572 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(classes)); 573 objArrayHandle classes_array_h(THREAD, ca); 574 575 // frames array is null when only getting caller reference 576 objArrayOop fa = objArrayOop(JNIHandles::resolve(frames)); 577 objArrayHandle frames_array_h(THREAD, fa); 578 579 int limit = start_index+frame_count; 580 if (classes_array_h->length() < limit) { 581 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 582 } 583 584 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 585 return StackWalk::moreFrames(stackStream_h, mode, anchor, frame_count, 586 start_index, classes_array_h, 587 frames_array_h, THREAD); 588 JVM_END 589 590 JVM_ENTRY(void, JVM_FillStackFrames(JNIEnv *env, jclass stackStream, 591 jint start_index, 592 jobjectArray frames, 593 jint from_index, jint to_index)) 594 JVMWrapper("JVM_FillStackFrames"); 595 if (TraceStackWalk) { 596 tty->print("JVM_FillStackFrames() start_index=%d from_index=%d to_index=%d\n", 597 start_index, from_index, to_index); 598 } 599 600 JavaThread* jt = (JavaThread*) THREAD; 601 602 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 603 objArrayHandle frames_array_h(THREAD, fa); 604 605 if (frames_array_h->length() < to_index) { 606 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "array length not matched"); 607 } 608 609 for (int i = from_index; i < to_index; i++) { 610 Handle stackFrame(THREAD, frames_array_h->obj_at(i)); 611 java_lang_StackFrameInfo::fill_methodInfo(stackFrame, CHECK); 612 } 613 JVM_END 614 615 JVM_ENTRY(void, JVM_SetMethodInfo(JNIEnv *env, jobject frame)) 616 JVMWrapper("JVM_SetMethodInfo"); 617 Handle stackFrame(THREAD, JNIHandles::resolve(frame)); 618 java_lang_StackFrameInfo::fill_methodInfo(stackFrame, THREAD); 619 JVM_END 620 621 // java.lang.Object /////////////////////////////////////////////// 622 623 624 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 625 JVMWrapper("JVM_IHashCode"); 626 // as implemented in the classic virtual machine; return 0 if object is NULL 627 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 628 JVM_END 629 630 631 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 632 JVMWrapper("JVM_MonitorWait"); 633 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 634 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 635 if (JvmtiExport::should_post_monitor_wait()) { 636 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 637 638 // The current thread already owns the monitor and it has not yet 639 // been added to the wait queue so the current thread cannot be 640 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 641 // event handler cannot accidentally consume an unpark() meant for 642 // the ParkEvent associated with this ObjectMonitor. 643 } 644 ObjectSynchronizer::wait(obj, ms, CHECK); 645 JVM_END 646 647 648 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 649 JVMWrapper("JVM_MonitorNotify"); 650 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 651 ObjectSynchronizer::notify(obj, CHECK); 652 JVM_END 653 654 655 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 656 JVMWrapper("JVM_MonitorNotifyAll"); 657 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 658 ObjectSynchronizer::notifyall(obj, CHECK); 659 JVM_END 660 661 662 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 663 JVMWrapper("JVM_Clone"); 664 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 665 const KlassHandle klass (THREAD, obj->klass()); 666 JvmtiVMObjectAllocEventCollector oam; 667 668 #ifdef ASSERT 669 // Just checking that the cloneable flag is set correct 670 if (obj->is_array()) { 671 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 672 } else { 673 guarantee(obj->is_instance(), "should be instanceOop"); 674 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 675 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 676 } 677 #endif 678 679 // Check if class of obj supports the Cloneable interface. 680 // All arrays are considered to be cloneable (See JLS 20.1.5) 681 if (!klass->is_cloneable()) { 682 ResourceMark rm(THREAD); 683 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 684 } 685 686 // Make shallow object copy 687 const int size = obj->size(); 688 oop new_obj_oop = NULL; 689 if (obj->is_array()) { 690 const int length = ((arrayOop)obj())->length(); 691 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 692 } else { 693 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 694 } 695 696 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread 697 // is modifying a reference field in the clonee, a non-oop-atomic copy might 698 // be suspended in the middle of copying the pointer and end up with parts 699 // of two different pointers in the field. Subsequent dereferences will crash. 700 // 4846409: an oop-copy of objects with long or double fields or arrays of same 701 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead 702 // of oops. We know objects are aligned on a minimum of an jlong boundary. 703 // The same is true of StubRoutines::object_copy and the various oop_copy 704 // variants, and of the code generated by the inline_native_clone intrinsic. 705 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); 706 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop, 707 (size_t)align_object_size(size) / HeapWordsPerLong); 708 // Clear the header 709 new_obj_oop->init_mark(); 710 711 // Store check (mark entire object and let gc sort it out) 712 BarrierSet* bs = Universe::heap()->barrier_set(); 713 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); 714 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); 715 716 Handle new_obj(THREAD, new_obj_oop); 717 // Special handling for MemberNames. Since they contain Method* metadata, they 718 // must be registered so that RedefineClasses can fix metadata contained in them. 719 if (java_lang_invoke_MemberName::is_instance(new_obj()) && 720 java_lang_invoke_MemberName::is_method(new_obj())) { 721 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj()); 722 // MemberName may be unresolved, so doesn't need registration until resolved. 723 if (method != NULL) { 724 methodHandle m(THREAD, method); 725 // This can safepoint and redefine method, so need both new_obj and method 726 // in a handle, for two different reasons. new_obj can move, method can be 727 // deleted if nothing is using it on the stack. 728 m->method_holder()->add_member_name(new_obj()); 729 } 730 } 731 732 // Caution: this involves a java upcall, so the clone should be 733 // "gc-robust" by this stage. 734 if (klass->has_finalizer()) { 735 assert(obj->is_instance(), "should be instanceOop"); 736 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 737 new_obj = Handle(THREAD, new_obj_oop); 738 } 739 740 return JNIHandles::make_local(env, new_obj()); 741 JVM_END 742 743 // java.io.File /////////////////////////////////////////////////////////////// 744 745 JVM_LEAF(char*, JVM_NativePath(char* path)) 746 JVMWrapper("JVM_NativePath"); 747 return os::native_path(path); 748 JVM_END 749 750 751 // Misc. class handling /////////////////////////////////////////////////////////// 752 753 754 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 755 JVMWrapper("JVM_GetCallerClass"); 756 757 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 758 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 759 // temporarily for existing code to use until a replacement API is defined. 760 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 761 Klass* k = thread->security_get_caller_class(depth); 762 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 763 } 764 765 // Getting the class of the caller frame. 766 // 767 // The call stack at this point looks something like this: 768 // 769 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 770 // [1] [ @CallerSensitive API.method ] 771 // [.] [ (skipped intermediate frames) ] 772 // [n] [ caller ] 773 vframeStream vfst(thread); 774 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 775 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 776 Method* m = vfst.method(); 777 assert(m != NULL, "sanity"); 778 switch (n) { 779 case 0: 780 // This must only be called from Reflection.getCallerClass 781 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 782 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 783 } 784 // fall-through 785 case 1: 786 // Frame 0 and 1 must be caller sensitive. 787 if (!m->caller_sensitive()) { 788 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 789 } 790 break; 791 default: 792 if (!m->is_ignored_by_security_stack_walk()) { 793 // We have reached the desired frame; return the holder class. 794 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 795 } 796 break; 797 } 798 } 799 return NULL; 800 JVM_END 801 802 803 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 804 JVMWrapper("JVM_FindPrimitiveClass"); 805 oop mirror = NULL; 806 BasicType t = name2type(utf); 807 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 808 mirror = Universe::java_mirror(t); 809 } 810 if (mirror == NULL) { 811 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 812 } else { 813 return (jclass) JNIHandles::make_local(env, mirror); 814 } 815 JVM_END 816 817 818 // Returns a class loaded by the bootstrap class loader; or null 819 // if not found. ClassNotFoundException is not thrown. 820 // FindClassFromBootLoader is exported to the launcher for windows. 821 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 822 const char* name)) 823 JVMWrapper("JVM_FindClassFromBootLoader"); 824 825 // Java libraries should ensure that name is never null... 826 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 827 // It's impossible to create this class; the name cannot fit 828 // into the constant pool. 829 return NULL; 830 } 831 832 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 833 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 834 if (k == NULL) { 835 return NULL; 836 } 837 838 if (log_is_enabled(Info, classresolve)) { 839 trace_class_resolution(k); 840 } 841 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 842 JVM_END 843 844 // Find a class with this name in this loader, using the caller's protection domain. 845 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 846 jboolean init, jobject loader, 847 jclass caller)) 848 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 849 // Java libraries should ensure that name is never null... 850 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 851 // It's impossible to create this class; the name cannot fit 852 // into the constant pool. 853 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 854 } 855 856 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 857 858 oop loader_oop = JNIHandles::resolve(loader); 859 oop from_class = JNIHandles::resolve(caller); 860 oop protection_domain = NULL; 861 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 862 // NPE. Put it in another way, the bootstrap class loader has all permission and 863 // thus no checkPackageAccess equivalence in the VM class loader. 864 // The caller is also passed as NULL by the java code if there is no security 865 // manager to avoid the performance cost of getting the calling class. 866 if (from_class != NULL && loader_oop != NULL) { 867 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 868 } 869 870 Handle h_loader(THREAD, loader_oop); 871 Handle h_prot(THREAD, protection_domain); 872 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 873 h_prot, false, THREAD); 874 875 if (log_is_enabled(Info, classresolve) && result != NULL) { 876 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 877 } 878 return result; 879 JVM_END 880 881 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 882 jboolean init, jclass from)) 883 JVMWrapper("JVM_FindClassFromClass"); 884 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 885 // It's impossible to create this class; the name cannot fit 886 // into the constant pool. 887 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 888 } 889 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 890 oop from_class_oop = JNIHandles::resolve(from); 891 Klass* from_class = (from_class_oop == NULL) 892 ? (Klass*)NULL 893 : java_lang_Class::as_Klass(from_class_oop); 894 oop class_loader = NULL; 895 oop protection_domain = NULL; 896 if (from_class != NULL) { 897 class_loader = from_class->class_loader(); 898 protection_domain = from_class->protection_domain(); 899 } 900 Handle h_loader(THREAD, class_loader); 901 Handle h_prot (THREAD, protection_domain); 902 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 903 h_prot, true, thread); 904 905 if (log_is_enabled(Info, classresolve) && result != NULL) { 906 // this function is generally only used for class loading during verification. 907 ResourceMark rm; 908 oop from_mirror = JNIHandles::resolve_non_null(from); 909 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 910 const char * from_name = from_class->external_name(); 911 912 oop mirror = JNIHandles::resolve_non_null(result); 913 Klass* to_class = java_lang_Class::as_Klass(mirror); 914 const char * to = to_class->external_name(); 915 log_info(classresolve)("%s %s (verification)", from_name, to); 916 } 917 918 return result; 919 JVM_END 920 921 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 922 if (loader.is_null()) { 923 return; 924 } 925 926 // check whether the current caller thread holds the lock or not. 927 // If not, increment the corresponding counter 928 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 929 ObjectSynchronizer::owner_self) { 930 counter->inc(); 931 } 932 } 933 934 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 935 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 936 jobject loader, const jbyte *buf, 937 jsize len, jobject pd, const char *source, 938 TRAPS) { 939 if (source == NULL) source = "__JVM_DefineClass__"; 940 941 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 942 JavaThread* jt = (JavaThread*) THREAD; 943 944 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 945 ClassLoader::perf_define_appclass_selftime(), 946 ClassLoader::perf_define_appclasses(), 947 jt->get_thread_stat()->perf_recursion_counts_addr(), 948 jt->get_thread_stat()->perf_timers_addr(), 949 PerfClassTraceTime::DEFINE_CLASS); 950 951 if (UsePerfData) { 952 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 953 } 954 955 // Since exceptions can be thrown, class initialization can take place 956 // if name is NULL no check for class name in .class stream has to be made. 957 TempNewSymbol class_name = NULL; 958 if (name != NULL) { 959 const int str_len = (int)strlen(name); 960 if (str_len > Symbol::max_length()) { 961 // It's impossible to create this class; the name cannot fit 962 // into the constant pool. 963 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 964 } 965 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 966 } 967 968 ResourceMark rm(THREAD); 969 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 970 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 971 if (UsePerfData) { 972 is_lock_held_by_thread(class_loader, 973 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 974 THREAD); 975 } 976 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 977 Klass* k = SystemDictionary::resolve_from_stream(class_name, 978 class_loader, 979 protection_domain, 980 &st, 981 CHECK_NULL); 982 983 if (log_is_enabled(Info, classresolve) && k != NULL) { 984 trace_class_resolution(k); 985 } 986 987 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 988 } 989 990 991 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 992 JVMWrapper("JVM_DefineClass"); 993 994 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 995 JVM_END 996 997 998 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 999 JVMWrapper("JVM_DefineClassWithSource"); 1000 1001 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 1002 JVM_END 1003 1004 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1005 JVMWrapper("JVM_FindLoadedClass"); 1006 ResourceMark rm(THREAD); 1007 1008 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1009 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 1010 1011 const char* str = java_lang_String::as_utf8_string(string()); 1012 // Sanity check, don't expect null 1013 if (str == NULL) return NULL; 1014 1015 const int str_len = (int)strlen(str); 1016 if (str_len > Symbol::max_length()) { 1017 // It's impossible to create this class; the name cannot fit 1018 // into the constant pool. 1019 return NULL; 1020 } 1021 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 1022 1023 // Security Note: 1024 // The Java level wrapper will perform the necessary security check allowing 1025 // us to pass the NULL as the initiating class loader. 1026 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1027 if (UsePerfData) { 1028 is_lock_held_by_thread(h_loader, 1029 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1030 THREAD); 1031 } 1032 1033 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1034 h_loader, 1035 Handle(), 1036 CHECK_NULL); 1037 #if INCLUDE_CDS 1038 if (k == NULL) { 1039 // If the class is not already loaded, try to see if it's in the shared 1040 // archive for the current classloader (h_loader). 1041 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class( 1042 klass_name, h_loader, CHECK_NULL); 1043 k = ik(); 1044 } 1045 #endif 1046 return (k == NULL) ? NULL : 1047 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1048 JVM_END 1049 1050 1051 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1052 1053 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1054 assert (cls != NULL, "illegal class"); 1055 JVMWrapper("JVM_GetClassName"); 1056 JvmtiVMObjectAllocEventCollector oam; 1057 ResourceMark rm(THREAD); 1058 const char* name; 1059 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1060 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1061 } else { 1062 // Consider caching interned string in Klass 1063 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1064 assert(k->is_klass(), "just checking"); 1065 name = k->external_name(); 1066 } 1067 oop result = StringTable::intern((char*) name, CHECK_NULL); 1068 return (jstring) JNIHandles::make_local(env, result); 1069 JVM_END 1070 1071 1072 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1073 JVMWrapper("JVM_GetClassInterfaces"); 1074 JvmtiVMObjectAllocEventCollector oam; 1075 oop mirror = JNIHandles::resolve_non_null(cls); 1076 1077 // Special handling for primitive objects 1078 if (java_lang_Class::is_primitive(mirror)) { 1079 // Primitive objects does not have any interfaces 1080 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1081 return (jobjectArray) JNIHandles::make_local(env, r); 1082 } 1083 1084 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror)); 1085 // Figure size of result array 1086 int size; 1087 if (klass->is_instance_klass()) { 1088 size = InstanceKlass::cast(klass())->local_interfaces()->length(); 1089 } else { 1090 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1091 size = 2; 1092 } 1093 1094 // Allocate result array 1095 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1096 objArrayHandle result (THREAD, r); 1097 // Fill in result 1098 if (klass->is_instance_klass()) { 1099 // Regular instance klass, fill in all local interfaces 1100 for (int index = 0; index < size; index++) { 1101 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index); 1102 result->obj_at_put(index, k->java_mirror()); 1103 } 1104 } else { 1105 // All arrays implement java.lang.Cloneable and java.io.Serializable 1106 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1107 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1108 } 1109 return (jobjectArray) JNIHandles::make_local(env, result()); 1110 JVM_END 1111 1112 1113 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1114 JVMWrapper("JVM_IsInterface"); 1115 oop mirror = JNIHandles::resolve_non_null(cls); 1116 if (java_lang_Class::is_primitive(mirror)) { 1117 return JNI_FALSE; 1118 } 1119 Klass* k = java_lang_Class::as_Klass(mirror); 1120 jboolean result = k->is_interface(); 1121 assert(!result || k->is_instance_klass(), 1122 "all interfaces are instance types"); 1123 // The compiler intrinsic for isInterface tests the 1124 // Klass::_access_flags bits in the same way. 1125 return result; 1126 JVM_END 1127 1128 1129 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1130 JVMWrapper("JVM_GetClassSigners"); 1131 JvmtiVMObjectAllocEventCollector oam; 1132 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1133 // There are no signers for primitive types 1134 return NULL; 1135 } 1136 1137 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1138 1139 // If there are no signers set in the class, or if the class 1140 // is an array, return NULL. 1141 if (signers == NULL) return NULL; 1142 1143 // copy of the signers array 1144 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1145 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1146 for (int index = 0; index < signers->length(); index++) { 1147 signers_copy->obj_at_put(index, signers->obj_at(index)); 1148 } 1149 1150 // return the copy 1151 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1152 JVM_END 1153 1154 1155 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1156 JVMWrapper("JVM_SetClassSigners"); 1157 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1158 // This call is ignored for primitive types and arrays. 1159 // Signers are only set once, ClassLoader.java, and thus shouldn't 1160 // be called with an array. Only the bootstrap loader creates arrays. 1161 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1162 if (k->is_instance_klass()) { 1163 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1164 } 1165 } 1166 JVM_END 1167 1168 1169 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1170 JVMWrapper("JVM_GetProtectionDomain"); 1171 if (JNIHandles::resolve(cls) == NULL) { 1172 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1173 } 1174 1175 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1176 // Primitive types does not have a protection domain. 1177 return NULL; 1178 } 1179 1180 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1181 return (jobject) JNIHandles::make_local(env, pd); 1182 JVM_END 1183 1184 1185 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) { 1186 // If there is a security manager and protection domain, check the access 1187 // in the protection domain, otherwise it is authorized. 1188 if (java_lang_System::has_security_manager()) { 1189 1190 // For bootstrapping, if pd implies method isn't in the JDK, allow 1191 // this context to revert to older behavior. 1192 // In this case the isAuthorized field in AccessControlContext is also not 1193 // present. 1194 if (Universe::protection_domain_implies_method() == NULL) { 1195 return true; 1196 } 1197 1198 // Whitelist certain access control contexts 1199 if (java_security_AccessControlContext::is_authorized(context)) { 1200 return true; 1201 } 1202 1203 oop prot = klass->protection_domain(); 1204 if (prot != NULL) { 1205 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1206 // in the new wrapper. 1207 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1208 Handle h_prot(THREAD, prot); 1209 JavaValue result(T_BOOLEAN); 1210 JavaCallArguments args(h_prot); 1211 JavaCalls::call(&result, m, &args, CHECK_false); 1212 return (result.get_jboolean() != 0); 1213 } 1214 } 1215 return true; 1216 } 1217 1218 // Create an AccessControlContext with a protection domain with null codesource 1219 // and null permissions - which gives no permissions. 1220 oop create_dummy_access_control_context(TRAPS) { 1221 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1222 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1223 // Call constructor ProtectionDomain(null, null); 1224 JavaValue result(T_VOID); 1225 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass), 1226 vmSymbols::object_initializer_name(), 1227 vmSymbols::codesource_permissioncollection_signature(), 1228 Handle(), Handle(), CHECK_NULL); 1229 1230 // new ProtectionDomain[] {pd}; 1231 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1232 context->obj_at_put(0, obj()); 1233 1234 // new AccessControlContext(new ProtectionDomain[] {pd}) 1235 objArrayHandle h_context(THREAD, context); 1236 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1237 return acc; 1238 } 1239 1240 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1241 JVMWrapper("JVM_DoPrivileged"); 1242 1243 if (action == NULL) { 1244 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1245 } 1246 1247 // Compute the frame initiating the do privileged operation and setup the privileged stack 1248 vframeStream vfst(thread); 1249 vfst.security_get_caller_frame(1); 1250 1251 if (vfst.at_end()) { 1252 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1253 } 1254 1255 Method* method = vfst.method(); 1256 instanceKlassHandle klass (THREAD, method->method_holder()); 1257 1258 // Check that action object understands "Object run()" 1259 Handle h_context; 1260 if (context != NULL) { 1261 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1262 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1263 if (!authorized) { 1264 // Create an unprivileged access control object and call it's run function 1265 // instead. 1266 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1267 h_context = Handle(THREAD, noprivs); 1268 } 1269 } 1270 1271 // Check that action object understands "Object run()" 1272 Handle object (THREAD, JNIHandles::resolve(action)); 1273 1274 // get run() method 1275 Method* m_oop = object->klass()->uncached_lookup_method( 1276 vmSymbols::run_method_name(), 1277 vmSymbols::void_object_signature(), 1278 Klass::find_overpass); 1279 methodHandle m (THREAD, m_oop); 1280 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { 1281 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1282 } 1283 1284 // Stack allocated list of privileged stack elements 1285 PrivilegedElement pi; 1286 if (!vfst.at_end()) { 1287 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1288 thread->set_privileged_stack_top(&pi); 1289 } 1290 1291 1292 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1293 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1294 Handle pending_exception; 1295 JavaValue result(T_OBJECT); 1296 JavaCallArguments args(object); 1297 JavaCalls::call(&result, m, &args, THREAD); 1298 1299 // done with action, remove ourselves from the list 1300 if (!vfst.at_end()) { 1301 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1302 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1303 } 1304 1305 if (HAS_PENDING_EXCEPTION) { 1306 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1307 CLEAR_PENDING_EXCEPTION; 1308 // JVMTI has already reported the pending exception 1309 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1310 if (THREAD->is_Java_thread()) { 1311 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1312 } 1313 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1314 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1315 // Throw a java.security.PrivilegedActionException(Exception e) exception 1316 JavaCallArguments args(pending_exception); 1317 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1318 vmSymbols::exception_void_signature(), 1319 &args); 1320 } 1321 } 1322 1323 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1324 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1325 JVM_END 1326 1327 1328 // Returns the inherited_access_control_context field of the running thread. 1329 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1330 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1331 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1332 return JNIHandles::make_local(env, result); 1333 JVM_END 1334 1335 class RegisterArrayForGC { 1336 private: 1337 JavaThread *_thread; 1338 public: 1339 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1340 _thread = thread; 1341 _thread->register_array_for_gc(array); 1342 } 1343 1344 ~RegisterArrayForGC() { 1345 _thread->register_array_for_gc(NULL); 1346 } 1347 }; 1348 1349 1350 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1351 JVMWrapper("JVM_GetStackAccessControlContext"); 1352 if (!UsePrivilegedStack) return NULL; 1353 1354 ResourceMark rm(THREAD); 1355 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1356 JvmtiVMObjectAllocEventCollector oam; 1357 1358 // count the protection domains on the execution stack. We collapse 1359 // duplicate consecutive protection domains into a single one, as 1360 // well as stopping when we hit a privileged frame. 1361 1362 // Use vframeStream to iterate through Java frames 1363 vframeStream vfst(thread); 1364 1365 oop previous_protection_domain = NULL; 1366 Handle privileged_context(thread, NULL); 1367 bool is_privileged = false; 1368 oop protection_domain = NULL; 1369 1370 for(; !vfst.at_end(); vfst.next()) { 1371 // get method of frame 1372 Method* method = vfst.method(); 1373 intptr_t* frame_id = vfst.frame_id(); 1374 1375 // check the privileged frames to see if we have a match 1376 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1377 // this frame is privileged 1378 is_privileged = true; 1379 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1380 protection_domain = thread->privileged_stack_top()->protection_domain(); 1381 } else { 1382 protection_domain = method->method_holder()->protection_domain(); 1383 } 1384 1385 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1386 local_array->push(protection_domain); 1387 previous_protection_domain = protection_domain; 1388 } 1389 1390 if (is_privileged) break; 1391 } 1392 1393 1394 // either all the domains on the stack were system domains, or 1395 // we had a privileged system domain 1396 if (local_array->is_empty()) { 1397 if (is_privileged && privileged_context.is_null()) return NULL; 1398 1399 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1400 return JNIHandles::make_local(env, result); 1401 } 1402 1403 // the resource area must be registered in case of a gc 1404 RegisterArrayForGC ragc(thread, local_array); 1405 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1406 local_array->length(), CHECK_NULL); 1407 objArrayHandle h_context(thread, context); 1408 for (int index = 0; index < local_array->length(); index++) { 1409 h_context->obj_at_put(index, local_array->at(index)); 1410 } 1411 1412 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1413 1414 return JNIHandles::make_local(env, result); 1415 JVM_END 1416 1417 1418 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1419 JVMWrapper("JVM_IsArrayClass"); 1420 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1421 return (k != NULL) && k->is_array_klass() ? true : false; 1422 JVM_END 1423 1424 1425 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1426 JVMWrapper("JVM_IsPrimitiveClass"); 1427 oop mirror = JNIHandles::resolve_non_null(cls); 1428 return (jboolean) java_lang_Class::is_primitive(mirror); 1429 JVM_END 1430 1431 1432 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1433 JVMWrapper("JVM_GetClassModifiers"); 1434 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1435 // Primitive type 1436 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1437 } 1438 1439 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1440 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1441 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1442 return k->modifier_flags(); 1443 JVM_END 1444 1445 1446 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1447 1448 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1449 JvmtiVMObjectAllocEventCollector oam; 1450 // ofClass is a reference to a java_lang_Class object. The mirror object 1451 // of an InstanceKlass 1452 1453 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1454 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1455 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1456 return (jobjectArray)JNIHandles::make_local(env, result); 1457 } 1458 1459 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1460 InnerClassesIterator iter(k); 1461 1462 if (iter.length() == 0) { 1463 // Neither an inner nor outer class 1464 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1465 return (jobjectArray)JNIHandles::make_local(env, result); 1466 } 1467 1468 // find inner class info 1469 constantPoolHandle cp(thread, k->constants()); 1470 int length = iter.length(); 1471 1472 // Allocate temp. result array 1473 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1474 objArrayHandle result (THREAD, r); 1475 int members = 0; 1476 1477 for (; !iter.done(); iter.next()) { 1478 int ioff = iter.inner_class_info_index(); 1479 int ooff = iter.outer_class_info_index(); 1480 1481 if (ioff != 0 && ooff != 0) { 1482 // Check to see if the name matches the class we're looking for 1483 // before attempting to find the class. 1484 if (cp->klass_name_at_matches(k, ooff)) { 1485 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1486 if (outer_klass == k()) { 1487 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1488 instanceKlassHandle inner_klass (THREAD, ik); 1489 1490 // Throws an exception if outer klass has not declared k as 1491 // an inner klass 1492 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1493 1494 result->obj_at_put(members, inner_klass->java_mirror()); 1495 members++; 1496 } 1497 } 1498 } 1499 } 1500 1501 if (members != length) { 1502 // Return array of right length 1503 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1504 for(int i = 0; i < members; i++) { 1505 res->obj_at_put(i, result->obj_at(i)); 1506 } 1507 return (jobjectArray)JNIHandles::make_local(env, res); 1508 } 1509 1510 return (jobjectArray)JNIHandles::make_local(env, result()); 1511 JVM_END 1512 1513 1514 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1515 { 1516 // ofClass is a reference to a java_lang_Class object. 1517 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1518 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1519 return NULL; 1520 } 1521 1522 bool inner_is_member = false; 1523 Klass* outer_klass 1524 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1525 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1526 if (outer_klass == NULL) return NULL; // already a top-level class 1527 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1528 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1529 } 1530 JVM_END 1531 1532 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1533 { 1534 oop mirror = JNIHandles::resolve_non_null(cls); 1535 if (java_lang_Class::is_primitive(mirror) || 1536 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1537 return NULL; 1538 } 1539 instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror))); 1540 int ooff = 0, noff = 0; 1541 if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) { 1542 if (noff != 0) { 1543 constantPoolHandle i_cp(thread, k->constants()); 1544 Symbol* name = i_cp->symbol_at(noff); 1545 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1546 return (jstring) JNIHandles::make_local(env, str()); 1547 } 1548 } 1549 return NULL; 1550 } 1551 JVM_END 1552 1553 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1554 assert (cls != NULL, "illegal class"); 1555 JVMWrapper("JVM_GetClassSignature"); 1556 JvmtiVMObjectAllocEventCollector oam; 1557 ResourceMark rm(THREAD); 1558 // Return null for arrays and primatives 1559 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1560 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1561 if (k->is_instance_klass()) { 1562 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1563 if (sym == NULL) return NULL; 1564 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1565 return (jstring) JNIHandles::make_local(env, str()); 1566 } 1567 } 1568 return NULL; 1569 JVM_END 1570 1571 1572 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1573 assert (cls != NULL, "illegal class"); 1574 JVMWrapper("JVM_GetClassAnnotations"); 1575 1576 // Return null for arrays and primitives 1577 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1578 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1579 if (k->is_instance_klass()) { 1580 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1581 return (jbyteArray) JNIHandles::make_local(env, a); 1582 } 1583 } 1584 return NULL; 1585 JVM_END 1586 1587 1588 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1589 // some of this code was adapted from from jni_FromReflectedField 1590 1591 oop reflected = JNIHandles::resolve_non_null(field); 1592 oop mirror = java_lang_reflect_Field::clazz(reflected); 1593 Klass* k = java_lang_Class::as_Klass(mirror); 1594 int slot = java_lang_reflect_Field::slot(reflected); 1595 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1596 1597 KlassHandle kh(THREAD, k); 1598 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot); 1599 1600 if (modifiers & JVM_ACC_STATIC) { 1601 // for static fields we only look in the current class 1602 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) { 1603 assert(false, "cannot find static field"); 1604 return false; 1605 } 1606 } else { 1607 // for instance fields we start with the current class and work 1608 // our way up through the superclass chain 1609 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) { 1610 assert(false, "cannot find instance field"); 1611 return false; 1612 } 1613 } 1614 return true; 1615 } 1616 1617 static Method* jvm_get_method_common(jobject method) { 1618 // some of this code was adapted from from jni_FromReflectedMethod 1619 1620 oop reflected = JNIHandles::resolve_non_null(method); 1621 oop mirror = NULL; 1622 int slot = 0; 1623 1624 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1625 mirror = java_lang_reflect_Constructor::clazz(reflected); 1626 slot = java_lang_reflect_Constructor::slot(reflected); 1627 } else { 1628 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1629 "wrong type"); 1630 mirror = java_lang_reflect_Method::clazz(reflected); 1631 slot = java_lang_reflect_Method::slot(reflected); 1632 } 1633 Klass* k = java_lang_Class::as_Klass(mirror); 1634 1635 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1636 assert(m != NULL, "cannot find method"); 1637 return m; // caller has to deal with NULL in product mode 1638 } 1639 1640 /* Type use annotations support (JDK 1.8) */ 1641 1642 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1643 assert (cls != NULL, "illegal class"); 1644 JVMWrapper("JVM_GetClassTypeAnnotations"); 1645 ResourceMark rm(THREAD); 1646 // Return null for arrays and primitives 1647 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1648 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1649 if (k->is_instance_klass()) { 1650 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1651 if (type_annotations != NULL) { 1652 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1653 return (jbyteArray) JNIHandles::make_local(env, a); 1654 } 1655 } 1656 } 1657 return NULL; 1658 JVM_END 1659 1660 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1661 assert (method != NULL, "illegal method"); 1662 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1663 1664 // method is a handle to a java.lang.reflect.Method object 1665 Method* m = jvm_get_method_common(method); 1666 if (m == NULL) { 1667 return NULL; 1668 } 1669 1670 AnnotationArray* type_annotations = m->type_annotations(); 1671 if (type_annotations != NULL) { 1672 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1673 return (jbyteArray) JNIHandles::make_local(env, a); 1674 } 1675 1676 return NULL; 1677 JVM_END 1678 1679 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1680 assert (field != NULL, "illegal field"); 1681 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1682 1683 fieldDescriptor fd; 1684 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1685 if (!gotFd) { 1686 return NULL; 1687 } 1688 1689 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1690 JVM_END 1691 1692 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { 1693 if (!cp->is_within_bounds(index)) { 1694 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1695 } 1696 } 1697 1698 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1699 { 1700 JVMWrapper("JVM_GetMethodParameters"); 1701 // method is a handle to a java.lang.reflect.Method object 1702 Method* method_ptr = jvm_get_method_common(method); 1703 methodHandle mh (THREAD, method_ptr); 1704 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1705 const int num_params = mh->method_parameters_length(); 1706 1707 if (num_params < 0) { 1708 // A -1 return value from method_parameters_length means there is no 1709 // parameter data. Return null to indicate this to the reflection 1710 // API. 1711 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1712 return (jobjectArray)NULL; 1713 } else { 1714 // Otherwise, we return something up to reflection, even if it is 1715 // a zero-length array. Why? Because in some cases this can 1716 // trigger a MalformedParametersException. 1717 1718 // make sure all the symbols are properly formatted 1719 for (int i = 0; i < num_params; i++) { 1720 MethodParametersElement* params = mh->method_parameters_start(); 1721 int index = params[i].name_cp_index; 1722 bounds_check(mh->constants(), index, CHECK_NULL); 1723 1724 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1725 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1726 "Wrong type at constant pool index"); 1727 } 1728 1729 } 1730 1731 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1732 objArrayHandle result (THREAD, result_oop); 1733 1734 for (int i = 0; i < num_params; i++) { 1735 MethodParametersElement* params = mh->method_parameters_start(); 1736 // For a 0 index, give a NULL symbol 1737 Symbol* sym = 0 != params[i].name_cp_index ? 1738 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1739 int flags = params[i].flags; 1740 oop param = Reflection::new_parameter(reflected_method, i, sym, 1741 flags, CHECK_NULL); 1742 result->obj_at_put(i, param); 1743 } 1744 return (jobjectArray)JNIHandles::make_local(env, result()); 1745 } 1746 } 1747 JVM_END 1748 1749 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1750 1751 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1752 { 1753 JVMWrapper("JVM_GetClassDeclaredFields"); 1754 JvmtiVMObjectAllocEventCollector oam; 1755 1756 // Exclude primitive types and array types 1757 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1758 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1759 // Return empty array 1760 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1761 return (jobjectArray) JNIHandles::make_local(env, res); 1762 } 1763 1764 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1765 constantPoolHandle cp(THREAD, k->constants()); 1766 1767 // Ensure class is linked 1768 k->link_class(CHECK_NULL); 1769 1770 // 4496456 We need to filter out java.lang.Throwable.backtrace 1771 bool skip_backtrace = false; 1772 1773 // Allocate result 1774 int num_fields; 1775 1776 if (publicOnly) { 1777 num_fields = 0; 1778 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) { 1779 if (fs.access_flags().is_public()) ++num_fields; 1780 } 1781 } else { 1782 num_fields = k->java_fields_count(); 1783 1784 if (k() == SystemDictionary::Throwable_klass()) { 1785 num_fields--; 1786 skip_backtrace = true; 1787 } 1788 } 1789 1790 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1791 objArrayHandle result (THREAD, r); 1792 1793 int out_idx = 0; 1794 fieldDescriptor fd; 1795 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1796 if (skip_backtrace) { 1797 // 4496456 skip java.lang.Throwable.backtrace 1798 int offset = fs.offset(); 1799 if (offset == java_lang_Throwable::get_backtrace_offset()) continue; 1800 } 1801 1802 if (!publicOnly || fs.access_flags().is_public()) { 1803 fd.reinitialize(k(), fs.index()); 1804 oop field = Reflection::new_field(&fd, CHECK_NULL); 1805 result->obj_at_put(out_idx, field); 1806 ++out_idx; 1807 } 1808 } 1809 assert(out_idx == num_fields, "just checking"); 1810 return (jobjectArray) JNIHandles::make_local(env, result()); 1811 } 1812 JVM_END 1813 1814 static bool select_method(methodHandle method, bool want_constructor) { 1815 if (want_constructor) { 1816 return (method->is_initializer() && !method->is_static()); 1817 } else { 1818 return (!method->is_initializer() && !method->is_overpass()); 1819 } 1820 } 1821 1822 static jobjectArray get_class_declared_methods_helper( 1823 JNIEnv *env, 1824 jclass ofClass, jboolean publicOnly, 1825 bool want_constructor, 1826 Klass* klass, TRAPS) { 1827 1828 JvmtiVMObjectAllocEventCollector oam; 1829 1830 // Exclude primitive types and array types 1831 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1832 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1833 // Return empty array 1834 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1835 return (jobjectArray) JNIHandles::make_local(env, res); 1836 } 1837 1838 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1839 1840 // Ensure class is linked 1841 k->link_class(CHECK_NULL); 1842 1843 Array<Method*>* methods = k->methods(); 1844 int methods_length = methods->length(); 1845 1846 // Save original method_idnum in case of redefinition, which can change 1847 // the idnum of obsolete methods. The new method will have the same idnum 1848 // but if we refresh the methods array, the counts will be wrong. 1849 ResourceMark rm(THREAD); 1850 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1851 int num_methods = 0; 1852 1853 for (int i = 0; i < methods_length; i++) { 1854 methodHandle method(THREAD, methods->at(i)); 1855 if (select_method(method, want_constructor)) { 1856 if (!publicOnly || method->is_public()) { 1857 idnums->push(method->method_idnum()); 1858 ++num_methods; 1859 } 1860 } 1861 } 1862 1863 // Allocate result 1864 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1865 objArrayHandle result (THREAD, r); 1866 1867 // Now just put the methods that we selected above, but go by their idnum 1868 // in case of redefinition. The methods can be redefined at any safepoint, 1869 // so above when allocating the oop array and below when creating reflect 1870 // objects. 1871 for (int i = 0; i < num_methods; i++) { 1872 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1873 if (method.is_null()) { 1874 // Method may have been deleted and seems this API can handle null 1875 // Otherwise should probably put a method that throws NSME 1876 result->obj_at_put(i, NULL); 1877 } else { 1878 oop m; 1879 if (want_constructor) { 1880 m = Reflection::new_constructor(method, CHECK_NULL); 1881 } else { 1882 m = Reflection::new_method(method, false, CHECK_NULL); 1883 } 1884 result->obj_at_put(i, m); 1885 } 1886 } 1887 1888 return (jobjectArray) JNIHandles::make_local(env, result()); 1889 } 1890 1891 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1892 { 1893 JVMWrapper("JVM_GetClassDeclaredMethods"); 1894 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1895 /*want_constructor*/ false, 1896 SystemDictionary::reflect_Method_klass(), THREAD); 1897 } 1898 JVM_END 1899 1900 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1901 { 1902 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1903 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1904 /*want_constructor*/ true, 1905 SystemDictionary::reflect_Constructor_klass(), THREAD); 1906 } 1907 JVM_END 1908 1909 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1910 { 1911 JVMWrapper("JVM_GetClassAccessFlags"); 1912 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1913 // Primitive type 1914 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1915 } 1916 1917 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1918 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1919 } 1920 JVM_END 1921 1922 1923 // Constant pool access ////////////////////////////////////////////////////////// 1924 1925 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1926 { 1927 JVMWrapper("JVM_GetClassConstantPool"); 1928 JvmtiVMObjectAllocEventCollector oam; 1929 1930 // Return null for primitives and arrays 1931 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1932 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1933 if (k->is_instance_klass()) { 1934 instanceKlassHandle k_h(THREAD, k); 1935 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL); 1936 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1937 return JNIHandles::make_local(jcp()); 1938 } 1939 } 1940 return NULL; 1941 } 1942 JVM_END 1943 1944 1945 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1946 { 1947 JVMWrapper("JVM_ConstantPoolGetSize"); 1948 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1949 return cp->length(); 1950 } 1951 JVM_END 1952 1953 1954 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1955 { 1956 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1957 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1958 bounds_check(cp, index, CHECK_NULL); 1959 constantTag tag = cp->tag_at(index); 1960 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1961 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1962 } 1963 Klass* k = cp->klass_at(index, CHECK_NULL); 1964 return (jclass) JNIHandles::make_local(k->java_mirror()); 1965 } 1966 JVM_END 1967 1968 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1969 { 1970 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1971 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1972 bounds_check(cp, index, CHECK_NULL); 1973 constantTag tag = cp->tag_at(index); 1974 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1975 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1976 } 1977 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1978 if (k == NULL) return NULL; 1979 return (jclass) JNIHandles::make_local(k->java_mirror()); 1980 } 1981 JVM_END 1982 1983 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1984 constantTag tag = cp->tag_at(index); 1985 if (!tag.is_method() && !tag.is_interface_method()) { 1986 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1987 } 1988 int klass_ref = cp->uncached_klass_ref_index_at(index); 1989 Klass* k_o; 1990 if (force_resolution) { 1991 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1992 } else { 1993 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1994 if (k_o == NULL) return NULL; 1995 } 1996 instanceKlassHandle k(THREAD, k_o); 1997 Symbol* name = cp->uncached_name_ref_at(index); 1998 Symbol* sig = cp->uncached_signature_ref_at(index); 1999 methodHandle m (THREAD, k->find_method(name, sig)); 2000 if (m.is_null()) { 2001 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2002 } 2003 oop method; 2004 if (!m->is_initializer() || m->is_static()) { 2005 method = Reflection::new_method(m, true, CHECK_NULL); 2006 } else { 2007 method = Reflection::new_constructor(m, CHECK_NULL); 2008 } 2009 return JNIHandles::make_local(method); 2010 } 2011 2012 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2013 { 2014 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 2015 JvmtiVMObjectAllocEventCollector oam; 2016 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2017 bounds_check(cp, index, CHECK_NULL); 2018 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2019 return res; 2020 } 2021 JVM_END 2022 2023 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2024 { 2025 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2026 JvmtiVMObjectAllocEventCollector oam; 2027 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2028 bounds_check(cp, index, CHECK_NULL); 2029 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2030 return res; 2031 } 2032 JVM_END 2033 2034 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2035 constantTag tag = cp->tag_at(index); 2036 if (!tag.is_field()) { 2037 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2038 } 2039 int klass_ref = cp->uncached_klass_ref_index_at(index); 2040 Klass* k_o; 2041 if (force_resolution) { 2042 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2043 } else { 2044 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2045 if (k_o == NULL) return NULL; 2046 } 2047 instanceKlassHandle k(THREAD, k_o); 2048 Symbol* name = cp->uncached_name_ref_at(index); 2049 Symbol* sig = cp->uncached_signature_ref_at(index); 2050 fieldDescriptor fd; 2051 Klass* target_klass = k->find_field(name, sig, &fd); 2052 if (target_klass == NULL) { 2053 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2054 } 2055 oop field = Reflection::new_field(&fd, CHECK_NULL); 2056 return JNIHandles::make_local(field); 2057 } 2058 2059 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2060 { 2061 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2062 JvmtiVMObjectAllocEventCollector oam; 2063 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2064 bounds_check(cp, index, CHECK_NULL); 2065 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2066 return res; 2067 } 2068 JVM_END 2069 2070 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2071 { 2072 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2073 JvmtiVMObjectAllocEventCollector oam; 2074 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2075 bounds_check(cp, index, CHECK_NULL); 2076 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2077 return res; 2078 } 2079 JVM_END 2080 2081 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2082 { 2083 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2084 JvmtiVMObjectAllocEventCollector oam; 2085 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2086 bounds_check(cp, index, CHECK_NULL); 2087 constantTag tag = cp->tag_at(index); 2088 if (!tag.is_field_or_method()) { 2089 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2090 } 2091 int klass_ref = cp->uncached_klass_ref_index_at(index); 2092 Symbol* klass_name = cp->klass_name_at(klass_ref); 2093 Symbol* member_name = cp->uncached_name_ref_at(index); 2094 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2095 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2096 objArrayHandle dest(THREAD, dest_o); 2097 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2098 dest->obj_at_put(0, str()); 2099 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2100 dest->obj_at_put(1, str()); 2101 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2102 dest->obj_at_put(2, str()); 2103 return (jobjectArray) JNIHandles::make_local(dest()); 2104 } 2105 JVM_END 2106 2107 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2108 { 2109 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2110 JvmtiVMObjectAllocEventCollector oam; 2111 constantPoolHandle cp(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2112 bounds_check(cp, index, CHECK_0); 2113 constantTag tag = cp->tag_at(index); 2114 if (!tag.is_field_or_method()) { 2115 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2116 } 2117 return (jint) cp->uncached_klass_ref_index_at(index); 2118 } 2119 JVM_END 2120 2121 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2122 { 2123 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2124 JvmtiVMObjectAllocEventCollector oam; 2125 constantPoolHandle cp(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2126 bounds_check(cp, index, CHECK_0); 2127 constantTag tag = cp->tag_at(index); 2128 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2129 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2130 } 2131 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2132 } 2133 JVM_END 2134 2135 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2136 { 2137 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2138 JvmtiVMObjectAllocEventCollector oam; 2139 constantPoolHandle cp(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2140 bounds_check(cp, index, CHECK_NULL); 2141 constantTag tag = cp->tag_at(index); 2142 if (!tag.is_name_and_type()) { 2143 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2144 } 2145 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2146 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2147 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2148 objArrayHandle dest(THREAD, dest_o); 2149 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2150 dest->obj_at_put(0, str()); 2151 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2152 dest->obj_at_put(1, str()); 2153 return (jobjectArray) JNIHandles::make_local(dest()); 2154 } 2155 JVM_END 2156 2157 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2158 { 2159 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2160 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2161 bounds_check(cp, index, CHECK_0); 2162 constantTag tag = cp->tag_at(index); 2163 if (!tag.is_int()) { 2164 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2165 } 2166 return cp->int_at(index); 2167 } 2168 JVM_END 2169 2170 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2171 { 2172 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2173 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2174 bounds_check(cp, index, CHECK_(0L)); 2175 constantTag tag = cp->tag_at(index); 2176 if (!tag.is_long()) { 2177 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2178 } 2179 return cp->long_at(index); 2180 } 2181 JVM_END 2182 2183 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2184 { 2185 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2186 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2187 bounds_check(cp, index, CHECK_(0.0f)); 2188 constantTag tag = cp->tag_at(index); 2189 if (!tag.is_float()) { 2190 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2191 } 2192 return cp->float_at(index); 2193 } 2194 JVM_END 2195 2196 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2197 { 2198 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2199 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2200 bounds_check(cp, index, CHECK_(0.0)); 2201 constantTag tag = cp->tag_at(index); 2202 if (!tag.is_double()) { 2203 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2204 } 2205 return cp->double_at(index); 2206 } 2207 JVM_END 2208 2209 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2210 { 2211 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2212 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2213 bounds_check(cp, index, CHECK_NULL); 2214 constantTag tag = cp->tag_at(index); 2215 if (!tag.is_string()) { 2216 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2217 } 2218 oop str = cp->string_at(index, CHECK_NULL); 2219 return (jstring) JNIHandles::make_local(str); 2220 } 2221 JVM_END 2222 2223 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2224 { 2225 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2226 JvmtiVMObjectAllocEventCollector oam; 2227 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2228 bounds_check(cp, index, CHECK_NULL); 2229 constantTag tag = cp->tag_at(index); 2230 if (!tag.is_symbol()) { 2231 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2232 } 2233 Symbol* sym = cp->symbol_at(index); 2234 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2235 return (jstring) JNIHandles::make_local(str()); 2236 } 2237 JVM_END 2238 2239 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2240 { 2241 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2242 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2243 bounds_check(cp, index, CHECK_0); 2244 constantTag tag = cp->tag_at(index); 2245 jbyte result = tag.value(); 2246 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2247 // they are changed to the corresponding tags from the JVM spec, so that java code in 2248 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2249 if (tag.is_klass_or_reference()) { 2250 result = JVM_CONSTANT_Class; 2251 } else if (tag.is_string_index()) { 2252 result = JVM_CONSTANT_String; 2253 } else if (tag.is_method_type_in_error()) { 2254 result = JVM_CONSTANT_MethodType; 2255 } else if (tag.is_method_handle_in_error()) { 2256 result = JVM_CONSTANT_MethodHandle; 2257 } 2258 return result; 2259 } 2260 JVM_END 2261 2262 // Assertion support. ////////////////////////////////////////////////////////// 2263 2264 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2265 JVMWrapper("JVM_DesiredAssertionStatus"); 2266 assert(cls != NULL, "bad class"); 2267 2268 oop r = JNIHandles::resolve(cls); 2269 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2270 if (java_lang_Class::is_primitive(r)) return false; 2271 2272 Klass* k = java_lang_Class::as_Klass(r); 2273 assert(k->is_instance_klass(), "must be an instance klass"); 2274 if (!k->is_instance_klass()) return false; 2275 2276 ResourceMark rm(THREAD); 2277 const char* name = k->name()->as_C_string(); 2278 bool system_class = k->class_loader() == NULL; 2279 return JavaAssertions::enabled(name, system_class); 2280 2281 JVM_END 2282 2283 2284 // Return a new AssertionStatusDirectives object with the fields filled in with 2285 // command-line assertion arguments (i.e., -ea, -da). 2286 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2287 JVMWrapper("JVM_AssertionStatusDirectives"); 2288 JvmtiVMObjectAllocEventCollector oam; 2289 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2290 return JNIHandles::make_local(env, asd); 2291 JVM_END 2292 2293 // Verification //////////////////////////////////////////////////////////////////////////////// 2294 2295 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2296 2297 // RedefineClasses support: bug 6214132 caused verification to fail. 2298 // All functions from this section should call the jvmtiThreadSate function: 2299 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2300 // The function returns a Klass* of the _scratch_class if the verifier 2301 // was invoked in the middle of the class redefinition. 2302 // Otherwise it returns its argument value which is the _the_class Klass*. 2303 // Please, refer to the description in the jvmtiThreadSate.hpp. 2304 2305 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2306 JVMWrapper("JVM_GetClassNameUTF"); 2307 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2308 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2309 return k->name()->as_utf8(); 2310 JVM_END 2311 2312 2313 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2314 JVMWrapper("JVM_GetClassCPTypes"); 2315 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2316 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2317 // types will have length zero if this is not an InstanceKlass 2318 // (length is determined by call to JVM_GetClassCPEntriesCount) 2319 if (k->is_instance_klass()) { 2320 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2321 for (int index = cp->length() - 1; index >= 0; index--) { 2322 constantTag tag = cp->tag_at(index); 2323 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2324 } 2325 } 2326 JVM_END 2327 2328 2329 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2330 JVMWrapper("JVM_GetClassCPEntriesCount"); 2331 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2332 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2333 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2334 JVM_END 2335 2336 2337 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2338 JVMWrapper("JVM_GetClassFieldsCount"); 2339 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2340 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2341 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2342 JVM_END 2343 2344 2345 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2346 JVMWrapper("JVM_GetClassMethodsCount"); 2347 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2348 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2349 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2350 JVM_END 2351 2352 2353 // The following methods, used for the verifier, are never called with 2354 // array klasses, so a direct cast to InstanceKlass is safe. 2355 // Typically, these methods are called in a loop with bounds determined 2356 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2357 // zero for arrays. 2358 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2359 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2360 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2361 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2362 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2363 int length = method->checked_exceptions_length(); 2364 if (length > 0) { 2365 CheckedExceptionElement* table= method->checked_exceptions_start(); 2366 for (int i = 0; i < length; i++) { 2367 exceptions[i] = table[i].class_cp_index; 2368 } 2369 } 2370 JVM_END 2371 2372 2373 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2374 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2375 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2376 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2377 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2378 return method->checked_exceptions_length(); 2379 JVM_END 2380 2381 2382 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2383 JVMWrapper("JVM_GetMethodIxByteCode"); 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 memcpy(code, method->code_base(), method->code_size()); 2388 JVM_END 2389 2390 2391 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2392 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 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->code_size(); 2397 JVM_END 2398 2399 2400 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2401 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 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 ExceptionTable extable(method); 2406 entry->start_pc = extable.start_pc(entry_index); 2407 entry->end_pc = extable.end_pc(entry_index); 2408 entry->handler_pc = extable.handler_pc(entry_index); 2409 entry->catchType = extable.catch_type_index(entry_index); 2410 JVM_END 2411 2412 2413 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2414 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2415 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2416 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2417 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2418 return method->exception_table_length(); 2419 JVM_END 2420 2421 2422 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2423 JVMWrapper("JVM_GetMethodIxModifiers"); 2424 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2425 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2426 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2427 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2428 JVM_END 2429 2430 2431 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2432 JVMWrapper("JVM_GetFieldIxModifiers"); 2433 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2434 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2435 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2436 JVM_END 2437 2438 2439 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2440 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2441 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2442 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2443 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2444 return method->max_locals(); 2445 JVM_END 2446 2447 2448 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2449 JVMWrapper("JVM_GetMethodIxArgsSize"); 2450 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2451 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2452 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2453 return method->size_of_parameters(); 2454 JVM_END 2455 2456 2457 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2458 JVMWrapper("JVM_GetMethodIxMaxStack"); 2459 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2460 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2461 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2462 return method->verifier_max_stack(); 2463 JVM_END 2464 2465 2466 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2467 JVMWrapper("JVM_IsConstructorIx"); 2468 ResourceMark rm(THREAD); 2469 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2470 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2471 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2472 return method->name() == vmSymbols::object_initializer_name(); 2473 JVM_END 2474 2475 2476 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2477 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2478 ResourceMark rm(THREAD); 2479 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2480 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2481 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2482 return method->is_overpass(); 2483 JVM_END 2484 2485 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2486 JVMWrapper("JVM_GetMethodIxIxUTF"); 2487 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2488 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2489 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2490 return method->name()->as_utf8(); 2491 JVM_END 2492 2493 2494 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2495 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2496 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2497 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2498 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2499 return method->signature()->as_utf8(); 2500 JVM_END 2501 2502 /** 2503 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2504 * read entries in the constant pool. Since the old verifier always 2505 * works on a copy of the code, it will not see any rewriting that 2506 * may possibly occur in the middle of verification. So it is important 2507 * that nothing it calls tries to use the cpCache instead of the raw 2508 * constant pool, so we must use cp->uncached_x methods when appropriate. 2509 */ 2510 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2511 JVMWrapper("JVM_GetCPFieldNameUTF"); 2512 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2513 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2514 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2515 switch (cp->tag_at(cp_index).value()) { 2516 case JVM_CONSTANT_Fieldref: 2517 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2518 default: 2519 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2520 } 2521 ShouldNotReachHere(); 2522 return NULL; 2523 JVM_END 2524 2525 2526 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2527 JVMWrapper("JVM_GetCPMethodNameUTF"); 2528 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2529 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2530 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2531 switch (cp->tag_at(cp_index).value()) { 2532 case JVM_CONSTANT_InterfaceMethodref: 2533 case JVM_CONSTANT_Methodref: 2534 case JVM_CONSTANT_NameAndType: // for invokedynamic 2535 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2536 default: 2537 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2538 } 2539 ShouldNotReachHere(); 2540 return NULL; 2541 JVM_END 2542 2543 2544 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2545 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2546 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2547 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2548 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2549 switch (cp->tag_at(cp_index).value()) { 2550 case JVM_CONSTANT_InterfaceMethodref: 2551 case JVM_CONSTANT_Methodref: 2552 case JVM_CONSTANT_NameAndType: // for invokedynamic 2553 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2554 default: 2555 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2556 } 2557 ShouldNotReachHere(); 2558 return NULL; 2559 JVM_END 2560 2561 2562 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2563 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2564 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2565 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2566 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2567 switch (cp->tag_at(cp_index).value()) { 2568 case JVM_CONSTANT_Fieldref: 2569 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2570 default: 2571 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2572 } 2573 ShouldNotReachHere(); 2574 return NULL; 2575 JVM_END 2576 2577 2578 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2579 JVMWrapper("JVM_GetCPClassNameUTF"); 2580 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2581 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2582 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2583 Symbol* classname = cp->klass_name_at(cp_index); 2584 return classname->as_utf8(); 2585 JVM_END 2586 2587 2588 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2589 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2590 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2591 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2592 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2593 switch (cp->tag_at(cp_index).value()) { 2594 case JVM_CONSTANT_Fieldref: { 2595 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2596 Symbol* classname = cp->klass_name_at(class_index); 2597 return classname->as_utf8(); 2598 } 2599 default: 2600 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2601 } 2602 ShouldNotReachHere(); 2603 return NULL; 2604 JVM_END 2605 2606 2607 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2608 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2609 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2610 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2611 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2612 switch (cp->tag_at(cp_index).value()) { 2613 case JVM_CONSTANT_Methodref: 2614 case JVM_CONSTANT_InterfaceMethodref: { 2615 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2616 Symbol* classname = cp->klass_name_at(class_index); 2617 return classname->as_utf8(); 2618 } 2619 default: 2620 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2621 } 2622 ShouldNotReachHere(); 2623 return NULL; 2624 JVM_END 2625 2626 2627 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2628 JVMWrapper("JVM_GetCPFieldModifiers"); 2629 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2630 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2631 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2632 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2633 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2634 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2635 switch (cp->tag_at(cp_index).value()) { 2636 case JVM_CONSTANT_Fieldref: { 2637 Symbol* name = cp->uncached_name_ref_at(cp_index); 2638 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2639 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) { 2640 if (fs.name() == name && fs.signature() == signature) { 2641 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2642 } 2643 } 2644 return -1; 2645 } 2646 default: 2647 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2648 } 2649 ShouldNotReachHere(); 2650 return 0; 2651 JVM_END 2652 2653 2654 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2655 JVMWrapper("JVM_GetCPMethodModifiers"); 2656 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2657 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2658 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2659 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2660 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2661 switch (cp->tag_at(cp_index).value()) { 2662 case JVM_CONSTANT_Methodref: 2663 case JVM_CONSTANT_InterfaceMethodref: { 2664 Symbol* name = cp->uncached_name_ref_at(cp_index); 2665 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2666 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2667 int methods_count = methods->length(); 2668 for (int i = 0; i < methods_count; i++) { 2669 Method* method = methods->at(i); 2670 if (method->name() == name && method->signature() == signature) { 2671 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2672 } 2673 } 2674 return -1; 2675 } 2676 default: 2677 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2678 } 2679 ShouldNotReachHere(); 2680 return 0; 2681 JVM_END 2682 2683 2684 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2685 2686 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2687 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2688 JVM_END 2689 2690 2691 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2692 JVMWrapper("JVM_IsSameClassPackage"); 2693 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2694 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2695 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2696 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2697 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2698 JVM_END 2699 2700 // Printing support ////////////////////////////////////////////////// 2701 extern "C" { 2702 2703 ATTRIBUTE_PRINTF(3, 0) 2704 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2705 // see bug 4399518, 4417214 2706 if ((intptr_t)count <= 0) return -1; 2707 2708 int result = vsnprintf(str, count, fmt, args); 2709 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2710 // characters which would have been written had the buffer been large 2711 // enough; on Windows, it returns -1. We handle both cases here and 2712 // always return -1, and perform null termination. 2713 if ((result > 0 && (size_t)result >= count) || result == -1) { 2714 str[count - 1] = '\0'; 2715 result = -1; 2716 } 2717 2718 return result; 2719 } 2720 2721 ATTRIBUTE_PRINTF(3, 0) 2722 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2723 va_list args; 2724 int len; 2725 va_start(args, fmt); 2726 len = jio_vsnprintf(str, count, fmt, args); 2727 va_end(args); 2728 return len; 2729 } 2730 2731 ATTRIBUTE_PRINTF(2,3) 2732 int jio_fprintf(FILE* f, const char *fmt, ...) { 2733 int len; 2734 va_list args; 2735 va_start(args, fmt); 2736 len = jio_vfprintf(f, fmt, args); 2737 va_end(args); 2738 return len; 2739 } 2740 2741 ATTRIBUTE_PRINTF(2, 0) 2742 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2743 if (Arguments::vfprintf_hook() != NULL) { 2744 return Arguments::vfprintf_hook()(f, fmt, args); 2745 } else { 2746 return vfprintf(f, fmt, args); 2747 } 2748 } 2749 2750 ATTRIBUTE_PRINTF(1, 2) 2751 JNIEXPORT int jio_printf(const char *fmt, ...) { 2752 int len; 2753 va_list args; 2754 va_start(args, fmt); 2755 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2756 va_end(args); 2757 return len; 2758 } 2759 2760 2761 // HotSpot specific jio method 2762 void jio_print(const char* s) { 2763 // Try to make this function as atomic as possible. 2764 if (Arguments::vfprintf_hook() != NULL) { 2765 jio_fprintf(defaultStream::output_stream(), "%s", s); 2766 } else { 2767 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2768 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2769 } 2770 } 2771 2772 } // Extern C 2773 2774 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2775 2776 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 2777 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or 2778 // OSThread objects. The exception to this rule is when the target object is the thread 2779 // doing the operation, in which case we know that the thread won't exit until the 2780 // operation is done (all exits being voluntary). There are a few cases where it is 2781 // rather silly to do operations on yourself, like resuming yourself or asking whether 2782 // you are alive. While these can still happen, they are not subject to deadlocks if 2783 // the lock is held while the operation occurs (this is not the case for suspend, for 2784 // instance), and are very unlikely. Because IsAlive needs to be fast and its 2785 // implementation is local to this file, we always lock Threads_lock for that one. 2786 2787 static void thread_entry(JavaThread* thread, TRAPS) { 2788 HandleMark hm(THREAD); 2789 Handle obj(THREAD, thread->threadObj()); 2790 JavaValue result(T_VOID); 2791 JavaCalls::call_virtual(&result, 2792 obj, 2793 KlassHandle(THREAD, SystemDictionary::Thread_klass()), 2794 vmSymbols::run_method_name(), 2795 vmSymbols::void_method_signature(), 2796 THREAD); 2797 } 2798 2799 2800 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2801 JVMWrapper("JVM_StartThread"); 2802 JavaThread *native_thread = NULL; 2803 2804 // We cannot hold the Threads_lock when we throw an exception, 2805 // due to rank ordering issues. Example: we might need to grab the 2806 // Heap_lock while we construct the exception. 2807 bool throw_illegal_thread_state = false; 2808 2809 // We must release the Threads_lock before we can post a jvmti event 2810 // in Thread::start. 2811 { 2812 // Ensure that the C++ Thread and OSThread structures aren't freed before 2813 // we operate. 2814 MutexLocker mu(Threads_lock); 2815 2816 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2817 // re-starting an already started thread, so we should usually find 2818 // that the JavaThread is null. However for a JNI attached thread 2819 // there is a small window between the Thread object being created 2820 // (with its JavaThread set) and the update to its threadStatus, so we 2821 // have to check for this 2822 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2823 throw_illegal_thread_state = true; 2824 } else { 2825 // We could also check the stillborn flag to see if this thread was already stopped, but 2826 // for historical reasons we let the thread detect that itself when it starts running 2827 2828 jlong size = 2829 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2830 // Allocate the C++ Thread structure and create the native thread. The 2831 // stack size retrieved from java is signed, but the constructor takes 2832 // size_t (an unsigned type), so avoid passing negative values which would 2833 // result in really large stacks. 2834 size_t sz = size > 0 ? (size_t) size : 0; 2835 native_thread = new JavaThread(&thread_entry, sz); 2836 2837 // At this point it may be possible that no osthread was created for the 2838 // JavaThread due to lack of memory. Check for this situation and throw 2839 // an exception if necessary. Eventually we may want to change this so 2840 // that we only grab the lock if the thread was created successfully - 2841 // then we can also do this check and throw the exception in the 2842 // JavaThread constructor. 2843 if (native_thread->osthread() != NULL) { 2844 // Note: the current thread is not being used within "prepare". 2845 native_thread->prepare(jthread); 2846 } 2847 } 2848 } 2849 2850 if (throw_illegal_thread_state) { 2851 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2852 } 2853 2854 assert(native_thread != NULL, "Starting null thread?"); 2855 2856 if (native_thread->osthread() == NULL) { 2857 // No one should hold a reference to the 'native_thread'. 2858 delete native_thread; 2859 if (JvmtiExport::should_post_resource_exhausted()) { 2860 JvmtiExport::post_resource_exhausted( 2861 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2862 os::native_thread_creation_failed_msg()); 2863 } 2864 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2865 os::native_thread_creation_failed_msg()); 2866 } 2867 2868 Thread::start(native_thread); 2869 2870 JVM_END 2871 2872 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2873 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2874 // but is thought to be reliable and simple. In the case, where the receiver is the 2875 // same thread as the sender, no safepoint is needed. 2876 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2877 JVMWrapper("JVM_StopThread"); 2878 2879 oop java_throwable = JNIHandles::resolve(throwable); 2880 if (java_throwable == NULL) { 2881 THROW(vmSymbols::java_lang_NullPointerException()); 2882 } 2883 oop java_thread = JNIHandles::resolve_non_null(jthread); 2884 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2885 Events::log_exception(JavaThread::current(), 2886 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2887 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2888 // First check if thread is alive 2889 if (receiver != NULL) { 2890 // Check if exception is getting thrown at self (use oop equality, since the 2891 // target object might exit) 2892 if (java_thread == thread->threadObj()) { 2893 THROW_OOP(java_throwable); 2894 } else { 2895 // Enques a VM_Operation to stop all threads and then deliver the exception... 2896 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 2897 } 2898 } 2899 else { 2900 // Either: 2901 // - target thread has not been started before being stopped, or 2902 // - target thread already terminated 2903 // We could read the threadStatus to determine which case it is 2904 // but that is overkill as it doesn't matter. We must set the 2905 // stillborn flag for the first case, and if the thread has already 2906 // exited setting this flag has no affect 2907 java_lang_Thread::set_stillborn(java_thread); 2908 } 2909 JVM_END 2910 2911 2912 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2913 JVMWrapper("JVM_IsThreadAlive"); 2914 2915 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2916 return java_lang_Thread::is_alive(thread_oop); 2917 JVM_END 2918 2919 2920 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2921 JVMWrapper("JVM_SuspendThread"); 2922 oop java_thread = JNIHandles::resolve_non_null(jthread); 2923 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2924 2925 if (receiver != NULL) { 2926 // thread has run and has not exited (still on threads list) 2927 2928 { 2929 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2930 if (receiver->is_external_suspend()) { 2931 // Don't allow nested external suspend requests. We can't return 2932 // an error from this interface so just ignore the problem. 2933 return; 2934 } 2935 if (receiver->is_exiting()) { // thread is in the process of exiting 2936 return; 2937 } 2938 receiver->set_external_suspend(); 2939 } 2940 2941 // java_suspend() will catch threads in the process of exiting 2942 // and will ignore them. 2943 receiver->java_suspend(); 2944 2945 // It would be nice to have the following assertion in all the 2946 // time, but it is possible for a racing resume request to have 2947 // resumed this thread right after we suspended it. Temporarily 2948 // enable this assertion if you are chasing a different kind of 2949 // bug. 2950 // 2951 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2952 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2953 } 2954 JVM_END 2955 2956 2957 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2958 JVMWrapper("JVM_ResumeThread"); 2959 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 2960 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2961 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2962 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2963 // looks at it. 2964 MutexLocker ml(Threads_lock); 2965 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2966 if (thr != NULL) { 2967 // the thread has run and is not in the process of exiting 2968 thr->java_resume(); 2969 } 2970 JVM_END 2971 2972 2973 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2974 JVMWrapper("JVM_SetThreadPriority"); 2975 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2976 MutexLocker ml(Threads_lock); 2977 oop java_thread = JNIHandles::resolve_non_null(jthread); 2978 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2979 JavaThread* thr = java_lang_Thread::thread(java_thread); 2980 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 2981 Thread::set_priority(thr, (ThreadPriority)prio); 2982 } 2983 JVM_END 2984 2985 2986 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2987 JVMWrapper("JVM_Yield"); 2988 if (os::dont_yield()) return; 2989 HOTSPOT_THREAD_YIELD(); 2990 2991 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield. 2992 // Critical for similar threading behaviour 2993 if (ConvertYieldToSleep) { 2994 os::sleep(thread, MinSleepInterval, false); 2995 } else { 2996 os::naked_yield(); 2997 } 2998 JVM_END 2999 3000 3001 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3002 JVMWrapper("JVM_Sleep"); 3003 3004 if (millis < 0) { 3005 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3006 } 3007 3008 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 3009 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3010 } 3011 3012 // Save current thread state and restore it at the end of this block. 3013 // And set new thread state to SLEEPING. 3014 JavaThreadSleepState jtss(thread); 3015 3016 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3017 3018 EventThreadSleep event; 3019 3020 if (millis == 0) { 3021 // When ConvertSleepToYield is on, this matches the classic VM implementation of 3022 // JVM_Sleep. Critical for similar threading behaviour (Win32) 3023 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep 3024 // for SOLARIS 3025 if (ConvertSleepToYield) { 3026 os::naked_yield(); 3027 } else { 3028 ThreadState old_state = thread->osthread()->get_state(); 3029 thread->osthread()->set_state(SLEEPING); 3030 os::sleep(thread, MinSleepInterval, false); 3031 thread->osthread()->set_state(old_state); 3032 } 3033 } else { 3034 ThreadState old_state = thread->osthread()->get_state(); 3035 thread->osthread()->set_state(SLEEPING); 3036 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3037 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3038 // us while we were sleeping. We do not overwrite those. 3039 if (!HAS_PENDING_EXCEPTION) { 3040 if (event.should_commit()) { 3041 event.set_time(millis); 3042 event.commit(); 3043 } 3044 HOTSPOT_THREAD_SLEEP_END(1); 3045 3046 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3047 // to properly restore the thread state. That's likely wrong. 3048 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3049 } 3050 } 3051 thread->osthread()->set_state(old_state); 3052 } 3053 if (event.should_commit()) { 3054 event.set_time(millis); 3055 event.commit(); 3056 } 3057 HOTSPOT_THREAD_SLEEP_END(0); 3058 JVM_END 3059 3060 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3061 JVMWrapper("JVM_CurrentThread"); 3062 oop jthread = thread->threadObj(); 3063 assert (thread != NULL, "no current thread!"); 3064 return JNIHandles::make_local(env, jthread); 3065 JVM_END 3066 3067 3068 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3069 JVMWrapper("JVM_CountStackFrames"); 3070 3071 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3072 oop java_thread = JNIHandles::resolve_non_null(jthread); 3073 bool throw_illegal_thread_state = false; 3074 int count = 0; 3075 3076 { 3077 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3078 // We need to re-resolve the java_thread, since a GC might have happened during the 3079 // acquire of the lock 3080 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3081 3082 if (thr == NULL) { 3083 // do nothing 3084 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 3085 // Check whether this java thread has been suspended already. If not, throws 3086 // IllegalThreadStateException. We defer to throw that exception until 3087 // Threads_lock is released since loading exception class has to leave VM. 3088 // The correct way to test a thread is actually suspended is 3089 // wait_for_ext_suspend_completion(), but we can't call that while holding 3090 // the Threads_lock. The above tests are sufficient for our purposes 3091 // provided the walkability of the stack is stable - which it isn't 3092 // 100% but close enough for most practical purposes. 3093 throw_illegal_thread_state = true; 3094 } else { 3095 // Count all java activation, i.e., number of vframes 3096 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 3097 // Native frames are not counted 3098 if (!vfst.method()->is_native()) count++; 3099 } 3100 } 3101 } 3102 3103 if (throw_illegal_thread_state) { 3104 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3105 "this thread is not suspended"); 3106 } 3107 return count; 3108 JVM_END 3109 3110 // Consider: A better way to implement JVM_Interrupt() is to acquire 3111 // Threads_lock to resolve the jthread into a Thread pointer, fetch 3112 // Thread->platformevent, Thread->native_thr, Thread->parker, etc., 3113 // drop Threads_lock, and the perform the unpark() and thr_kill() operations 3114 // outside the critical section. Threads_lock is hot so we want to minimize 3115 // the hold-time. A cleaner interface would be to decompose interrupt into 3116 // two steps. The 1st phase, performed under Threads_lock, would return 3117 // a closure that'd be invoked after Threads_lock was dropped. 3118 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 3119 // admit spurious wakeups. 3120 3121 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3122 JVMWrapper("JVM_Interrupt"); 3123 3124 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3125 oop java_thread = JNIHandles::resolve_non_null(jthread); 3126 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3127 // We need to re-resolve the java_thread, since a GC might have happened during the 3128 // acquire of the lock 3129 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3130 if (thr != NULL) { 3131 Thread::interrupt(thr); 3132 } 3133 JVM_END 3134 3135 3136 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3137 JVMWrapper("JVM_IsInterrupted"); 3138 3139 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3140 oop java_thread = JNIHandles::resolve_non_null(jthread); 3141 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3142 // We need to re-resolve the java_thread, since a GC might have happened during the 3143 // acquire of the lock 3144 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3145 if (thr == NULL) { 3146 return JNI_FALSE; 3147 } else { 3148 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3149 } 3150 JVM_END 3151 3152 3153 // Return true iff the current thread has locked the object passed in 3154 3155 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3156 JVMWrapper("JVM_HoldsLock"); 3157 assert(THREAD->is_Java_thread(), "sanity check"); 3158 if (obj == NULL) { 3159 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3160 } 3161 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3162 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3163 JVM_END 3164 3165 3166 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3167 JVMWrapper("JVM_DumpAllStacks"); 3168 VM_PrintThreads op; 3169 VMThread::execute(&op); 3170 if (JvmtiExport::should_post_data_dump()) { 3171 JvmtiExport::post_data_dump(); 3172 } 3173 JVM_END 3174 3175 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3176 JVMWrapper("JVM_SetNativeThreadName"); 3177 ResourceMark rm(THREAD); 3178 oop java_thread = JNIHandles::resolve_non_null(jthread); 3179 JavaThread* thr = java_lang_Thread::thread(java_thread); 3180 // Thread naming only supported for the current thread, doesn't work for 3181 // target threads. 3182 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3183 // we don't set the name of an attached thread to avoid stepping 3184 // on other programs 3185 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3186 os::set_native_thread_name(thread_name); 3187 } 3188 JVM_END 3189 3190 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3191 3192 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3193 assert(jthread->is_Java_thread(), "must be a Java thread"); 3194 if (jthread->privileged_stack_top() == NULL) return false; 3195 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3196 oop loader = jthread->privileged_stack_top()->class_loader(); 3197 if (loader == NULL) return true; 3198 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3199 if (trusted) return true; 3200 } 3201 return false; 3202 } 3203 3204 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3205 JVMWrapper("JVM_CurrentLoadedClass"); 3206 ResourceMark rm(THREAD); 3207 3208 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3209 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3210 bool trusted = is_trusted_frame(thread, &vfst); 3211 if (trusted) return NULL; 3212 3213 Method* m = vfst.method(); 3214 if (!m->is_native()) { 3215 InstanceKlass* holder = m->method_holder(); 3216 oop loader = holder->class_loader(); 3217 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3218 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3219 } 3220 } 3221 } 3222 return NULL; 3223 JVM_END 3224 3225 3226 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3227 JVMWrapper("JVM_CurrentClassLoader"); 3228 ResourceMark rm(THREAD); 3229 3230 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3231 3232 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3233 bool trusted = is_trusted_frame(thread, &vfst); 3234 if (trusted) return NULL; 3235 3236 Method* m = vfst.method(); 3237 if (!m->is_native()) { 3238 InstanceKlass* holder = m->method_holder(); 3239 assert(holder->is_klass(), "just checking"); 3240 oop loader = holder->class_loader(); 3241 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3242 return JNIHandles::make_local(env, loader); 3243 } 3244 } 3245 } 3246 return NULL; 3247 JVM_END 3248 3249 3250 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3251 JVMWrapper("JVM_GetClassContext"); 3252 ResourceMark rm(THREAD); 3253 JvmtiVMObjectAllocEventCollector oam; 3254 vframeStream vfst(thread); 3255 3256 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3257 // This must only be called from SecurityManager.getClassContext 3258 Method* m = vfst.method(); 3259 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3260 m->name() == vmSymbols::getClassContext_name() && 3261 m->signature() == vmSymbols::void_class_array_signature())) { 3262 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3263 } 3264 } 3265 3266 // Collect method holders 3267 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>(); 3268 for (; !vfst.at_end(); vfst.security_next()) { 3269 Method* m = vfst.method(); 3270 // Native frames are not returned 3271 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3272 Klass* holder = m->method_holder(); 3273 assert(holder->is_klass(), "just checking"); 3274 klass_array->append(holder); 3275 } 3276 } 3277 3278 // Create result array of type [Ljava/lang/Class; 3279 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3280 // Fill in mirrors corresponding to method holders 3281 for (int i = 0; i < klass_array->length(); i++) { 3282 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3283 } 3284 3285 return (jobjectArray) JNIHandles::make_local(env, result); 3286 JVM_END 3287 3288 3289 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3290 JVMWrapper("JVM_ClassDepth"); 3291 ResourceMark rm(THREAD); 3292 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3293 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3294 3295 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3296 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3297 if (class_name_sym == NULL) { 3298 return -1; 3299 } 3300 3301 int depth = 0; 3302 3303 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3304 if (!vfst.method()->is_native()) { 3305 InstanceKlass* holder = vfst.method()->method_holder(); 3306 assert(holder->is_klass(), "just checking"); 3307 if (holder->name() == class_name_sym) { 3308 return depth; 3309 } 3310 depth++; 3311 } 3312 } 3313 return -1; 3314 JVM_END 3315 3316 3317 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3318 JVMWrapper("JVM_ClassLoaderDepth"); 3319 ResourceMark rm(THREAD); 3320 int depth = 0; 3321 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3322 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3323 bool trusted = is_trusted_frame(thread, &vfst); 3324 if (trusted) return -1; 3325 3326 Method* m = vfst.method(); 3327 if (!m->is_native()) { 3328 InstanceKlass* holder = m->method_holder(); 3329 assert(holder->is_klass(), "just checking"); 3330 oop loader = holder->class_loader(); 3331 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3332 return depth; 3333 } 3334 depth++; 3335 } 3336 } 3337 return -1; 3338 JVM_END 3339 3340 3341 // java.lang.Package //////////////////////////////////////////////////////////////// 3342 3343 3344 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3345 JVMWrapper("JVM_GetSystemPackage"); 3346 ResourceMark rm(THREAD); 3347 JvmtiVMObjectAllocEventCollector oam; 3348 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3349 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3350 return (jstring) JNIHandles::make_local(result); 3351 JVM_END 3352 3353 3354 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3355 JVMWrapper("JVM_GetSystemPackages"); 3356 JvmtiVMObjectAllocEventCollector oam; 3357 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3358 return (jobjectArray) JNIHandles::make_local(result); 3359 JVM_END 3360 3361 3362 // ObjectInputStream /////////////////////////////////////////////////////////////// 3363 3364 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3365 if (current_class == NULL) { 3366 return true; 3367 } 3368 if ((current_class == field_class) || access.is_public()) { 3369 return true; 3370 } 3371 3372 if (access.is_protected()) { 3373 // See if current_class is a subclass of field_class 3374 if (current_class->is_subclass_of(field_class)) { 3375 return true; 3376 } 3377 } 3378 3379 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3380 } 3381 3382 // Return the first non-null class loader up the execution stack, or null 3383 // if only code from the null class loader is on the stack. 3384 3385 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3386 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3387 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3388 oop loader = vfst.method()->method_holder()->class_loader(); 3389 if (loader != NULL) { 3390 return JNIHandles::make_local(env, loader); 3391 } 3392 } 3393 return NULL; 3394 JVM_END 3395 3396 3397 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3398 3399 3400 // resolve array handle and check arguments 3401 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3402 if (arr == NULL) { 3403 THROW_0(vmSymbols::java_lang_NullPointerException()); 3404 } 3405 oop a = JNIHandles::resolve_non_null(arr); 3406 if (!a->is_array()) { 3407 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3408 } else if (type_array_only && !a->is_typeArray()) { 3409 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3410 } 3411 return arrayOop(a); 3412 } 3413 3414 3415 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3416 JVMWrapper("JVM_GetArrayLength"); 3417 arrayOop a = check_array(env, arr, false, CHECK_0); 3418 return a->length(); 3419 JVM_END 3420 3421 3422 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3423 JVMWrapper("JVM_Array_Get"); 3424 JvmtiVMObjectAllocEventCollector oam; 3425 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3426 jvalue value; 3427 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3428 oop box = Reflection::box(&value, type, CHECK_NULL); 3429 return JNIHandles::make_local(env, box); 3430 JVM_END 3431 3432 3433 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3434 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3435 jvalue value; 3436 value.i = 0; // to initialize value before getting used in CHECK 3437 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3438 assert(a->is_typeArray(), "just checking"); 3439 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3440 BasicType wide_type = (BasicType) wCode; 3441 if (type != wide_type) { 3442 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3443 } 3444 return value; 3445 JVM_END 3446 3447 3448 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3449 JVMWrapper("JVM_SetArrayElement"); 3450 arrayOop a = check_array(env, arr, false, CHECK); 3451 oop box = JNIHandles::resolve(val); 3452 jvalue value; 3453 value.i = 0; // to initialize value before getting used in CHECK 3454 BasicType value_type; 3455 if (a->is_objArray()) { 3456 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3457 value_type = Reflection::unbox_for_regular_object(box, &value); 3458 } else { 3459 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3460 } 3461 Reflection::array_set(&value, a, index, value_type, CHECK); 3462 JVM_END 3463 3464 3465 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3466 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3467 arrayOop a = check_array(env, arr, true, CHECK); 3468 assert(a->is_typeArray(), "just checking"); 3469 BasicType value_type = (BasicType) vCode; 3470 Reflection::array_set(&v, a, index, value_type, CHECK); 3471 JVM_END 3472 3473 3474 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3475 JVMWrapper("JVM_NewArray"); 3476 JvmtiVMObjectAllocEventCollector oam; 3477 oop element_mirror = JNIHandles::resolve(eltClass); 3478 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3479 return JNIHandles::make_local(env, result); 3480 JVM_END 3481 3482 3483 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3484 JVMWrapper("JVM_NewMultiArray"); 3485 JvmtiVMObjectAllocEventCollector oam; 3486 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3487 oop element_mirror = JNIHandles::resolve(eltClass); 3488 assert(dim_array->is_typeArray(), "just checking"); 3489 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3490 return JNIHandles::make_local(env, result); 3491 JVM_END 3492 3493 3494 // Library support /////////////////////////////////////////////////////////////////////////// 3495 3496 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3497 //%note jvm_ct 3498 JVMWrapper("JVM_LoadLibrary"); 3499 char ebuf[1024]; 3500 void *load_result; 3501 { 3502 ThreadToNativeFromVM ttnfvm(thread); 3503 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3504 } 3505 if (load_result == NULL) { 3506 char msg[1024]; 3507 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3508 // Since 'ebuf' may contain a string encoded using 3509 // platform encoding scheme, we need to pass 3510 // Exceptions::unsafe_to_utf8 to the new_exception method 3511 // as the last argument. See bug 6367357. 3512 Handle h_exception = 3513 Exceptions::new_exception(thread, 3514 vmSymbols::java_lang_UnsatisfiedLinkError(), 3515 msg, Exceptions::unsafe_to_utf8); 3516 3517 THROW_HANDLE_0(h_exception); 3518 } 3519 return load_result; 3520 JVM_END 3521 3522 3523 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3524 JVMWrapper("JVM_UnloadLibrary"); 3525 os::dll_unload(handle); 3526 JVM_END 3527 3528 3529 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3530 JVMWrapper("JVM_FindLibraryEntry"); 3531 return os::dll_lookup(handle, name); 3532 JVM_END 3533 3534 3535 // JNI version /////////////////////////////////////////////////////////////////////////////// 3536 3537 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3538 JVMWrapper("JVM_IsSupportedJNIVersion"); 3539 return Threads::is_supported_jni_version_including_1_1(version); 3540 JVM_END 3541 3542 3543 // String support /////////////////////////////////////////////////////////////////////////// 3544 3545 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3546 JVMWrapper("JVM_InternString"); 3547 JvmtiVMObjectAllocEventCollector oam; 3548 if (str == NULL) return NULL; 3549 oop string = JNIHandles::resolve_non_null(str); 3550 oop result = StringTable::intern(string, CHECK_NULL); 3551 return (jstring) JNIHandles::make_local(env, result); 3552 JVM_END 3553 3554 3555 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3556 3557 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3558 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3559 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3560 // that only works with java threads. 3561 3562 3563 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3564 VM_Exit::block_if_vm_exited(); 3565 JVMWrapper("JVM_RawMonitorCreate"); 3566 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3567 } 3568 3569 3570 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3571 VM_Exit::block_if_vm_exited(); 3572 JVMWrapper("JVM_RawMonitorDestroy"); 3573 delete ((Mutex*) mon); 3574 } 3575 3576 3577 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3578 VM_Exit::block_if_vm_exited(); 3579 JVMWrapper("JVM_RawMonitorEnter"); 3580 ((Mutex*) mon)->jvm_raw_lock(); 3581 return 0; 3582 } 3583 3584 3585 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3586 VM_Exit::block_if_vm_exited(); 3587 JVMWrapper("JVM_RawMonitorExit"); 3588 ((Mutex*) mon)->jvm_raw_unlock(); 3589 } 3590 3591 3592 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3593 3594 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3595 Handle loader, Handle protection_domain, 3596 jboolean throwError, TRAPS) { 3597 // Security Note: 3598 // The Java level wrapper will perform the necessary security check allowing 3599 // us to pass the NULL as the initiating class loader. The VM is responsible for 3600 // the checkPackageAccess relative to the initiating class loader via the 3601 // protection_domain. The protection_domain is passed as NULL by the java code 3602 // if there is no security manager in 3-arg Class.forName(). 3603 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3604 3605 KlassHandle klass_handle(THREAD, klass); 3606 // Check if we should initialize the class 3607 if (init && klass_handle->is_instance_klass()) { 3608 klass_handle->initialize(CHECK_NULL); 3609 } 3610 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror()); 3611 } 3612 3613 3614 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3615 3616 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3617 JVMWrapper("JVM_InvokeMethod"); 3618 Handle method_handle; 3619 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3620 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3621 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3622 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3623 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3624 jobject res = JNIHandles::make_local(env, result); 3625 if (JvmtiExport::should_post_vm_object_alloc()) { 3626 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3627 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3628 if (java_lang_Class::is_primitive(ret_type)) { 3629 // Only for primitive type vm allocates memory for java object. 3630 // See box() method. 3631 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3632 } 3633 } 3634 return res; 3635 } else { 3636 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3637 } 3638 JVM_END 3639 3640 3641 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3642 JVMWrapper("JVM_NewInstanceFromConstructor"); 3643 oop constructor_mirror = JNIHandles::resolve(c); 3644 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3645 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3646 jobject res = JNIHandles::make_local(env, result); 3647 if (JvmtiExport::should_post_vm_object_alloc()) { 3648 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3649 } 3650 return res; 3651 JVM_END 3652 3653 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3654 3655 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3656 JVMWrapper("JVM_SupportsCX8"); 3657 return VM_Version::supports_cx8(); 3658 JVM_END 3659 3660 // Returns an array of all live Thread objects (VM internal JavaThreads, 3661 // jvmti agent threads, and JNI attaching threads are skipped) 3662 // See CR 6404306 regarding JNI attaching threads 3663 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3664 ResourceMark rm(THREAD); 3665 ThreadsListEnumerator tle(THREAD, false, false); 3666 JvmtiVMObjectAllocEventCollector oam; 3667 3668 int num_threads = tle.num_threads(); 3669 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3670 objArrayHandle threads_ah(THREAD, r); 3671 3672 for (int i = 0; i < num_threads; i++) { 3673 Handle h = tle.get_threadObj(i); 3674 threads_ah->obj_at_put(i, h()); 3675 } 3676 3677 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3678 JVM_END 3679 3680 3681 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3682 // Return StackTraceElement[][], each element is the stack trace of a thread in 3683 // the corresponding entry in the given threads array 3684 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3685 JVMWrapper("JVM_DumpThreads"); 3686 JvmtiVMObjectAllocEventCollector oam; 3687 3688 // Check if threads is null 3689 if (threads == NULL) { 3690 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3691 } 3692 3693 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3694 objArrayHandle ah(THREAD, a); 3695 int num_threads = ah->length(); 3696 // check if threads is non-empty array 3697 if (num_threads == 0) { 3698 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3699 } 3700 3701 // check if threads is not an array of objects of Thread class 3702 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3703 if (k != SystemDictionary::Thread_klass()) { 3704 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3705 } 3706 3707 ResourceMark rm(THREAD); 3708 3709 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3710 for (int i = 0; i < num_threads; i++) { 3711 oop thread_obj = ah->obj_at(i); 3712 instanceHandle h(THREAD, (instanceOop) thread_obj); 3713 thread_handle_array->append(h); 3714 } 3715 3716 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3717 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3718 3719 JVM_END 3720 3721 // JVM monitoring and management support 3722 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3723 return Management::get_jmm_interface(version); 3724 JVM_END 3725 3726 // com.sun.tools.attach.VirtualMachine agent properties support 3727 // 3728 // Initialize the agent properties with the properties maintained in the VM 3729 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3730 JVMWrapper("JVM_InitAgentProperties"); 3731 ResourceMark rm; 3732 3733 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3734 3735 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3736 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3737 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3738 return properties; 3739 JVM_END 3740 3741 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3742 { 3743 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3744 JvmtiVMObjectAllocEventCollector oam; 3745 3746 if (ofClass == NULL) { 3747 return NULL; 3748 } 3749 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3750 // Special handling for primitive objects 3751 if (java_lang_Class::is_primitive(mirror())) { 3752 return NULL; 3753 } 3754 Klass* k = java_lang_Class::as_Klass(mirror()); 3755 if (!k->is_instance_klass()) { 3756 return NULL; 3757 } 3758 instanceKlassHandle ik_h(THREAD, k); 3759 int encl_method_class_idx = ik_h->enclosing_method_class_index(); 3760 if (encl_method_class_idx == 0) { 3761 return NULL; 3762 } 3763 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3764 objArrayHandle dest(THREAD, dest_o); 3765 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3766 dest->obj_at_put(0, enc_k->java_mirror()); 3767 int encl_method_method_idx = ik_h->enclosing_method_method_index(); 3768 if (encl_method_method_idx != 0) { 3769 Symbol* sym = ik_h->constants()->symbol_at( 3770 extract_low_short_from_int( 3771 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3772 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3773 dest->obj_at_put(1, str()); 3774 sym = ik_h->constants()->symbol_at( 3775 extract_high_short_from_int( 3776 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3777 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3778 dest->obj_at_put(2, str()); 3779 } 3780 return (jobjectArray) JNIHandles::make_local(dest()); 3781 } 3782 JVM_END 3783 3784 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3785 { 3786 memset(info, 0, info_size); 3787 3788 info->jvm_version = Abstract_VM_Version::jvm_version(); 3789 info->patch_version = Abstract_VM_Version::vm_patch_version(); 3790 3791 // when we add a new capability in the jvm_version_info struct, we should also 3792 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3793 // counter defined in runtimeService.cpp. 3794 info->is_attachable = AttachListener::is_attach_supported(); 3795 } 3796 JVM_END 3797 3798 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3799 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3800 ResourceMark rm(THREAD); 3801 3802 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3803 return NULL; 3804 } 3805 3806 char** vm_flags = Arguments::jvm_flags_array(); 3807 char** vm_args = Arguments::jvm_args_array(); 3808 int num_flags = Arguments::num_jvm_flags(); 3809 int num_args = Arguments::num_jvm_args(); 3810 3811 instanceKlassHandle ik (THREAD, SystemDictionary::String_klass()); 3812 objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL); 3813 objArrayHandle result_h(THREAD, r); 3814 3815 int index = 0; 3816 for (int j = 0; j < num_flags; j++, index++) { 3817 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3818 result_h->obj_at_put(index, h()); 3819 } 3820 for (int i = 0; i < num_args; i++, index++) { 3821 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3822 result_h->obj_at_put(index, h()); 3823 } 3824 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3825 JVM_END 3826 3827 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3828 return os::get_signal_number(name); 3829 JVM_END --- EOF ---