1 /* 2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "classfile/classFileStream.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/javaAssertions.hpp" 31 #include "classfile/javaClasses.inline.hpp" 32 #include "classfile/moduleEntry.hpp" 33 #include "classfile/modules.hpp" 34 #include "classfile/packageEntry.hpp" 35 #include "classfile/stringTable.hpp" 36 #include "classfile/symbolTable.hpp" 37 #include "classfile/systemDictionary.hpp" 38 #include "classfile/vmSymbols.hpp" 39 #include "gc/shared/collectedHeap.inline.hpp" 40 #include "interpreter/bytecode.hpp" 41 #include "jfr/jfrEvents.hpp" 42 #include "logging/log.hpp" 43 #include "memory/heapShared.hpp" 44 #include "memory/oopFactory.hpp" 45 #include "memory/referenceType.hpp" 46 #include "memory/resourceArea.hpp" 47 #include "memory/universe.hpp" 48 #include "oops/access.inline.hpp" 49 #include "oops/constantPool.hpp" 50 #include "oops/fieldStreams.hpp" 51 #include "oops/instanceKlass.hpp" 52 #include "oops/method.hpp" 53 #include "oops/objArrayKlass.hpp" 54 #include "oops/objArrayOop.inline.hpp" 55 #include "oops/oop.inline.hpp" 56 #include "oops/valueArrayKlass.hpp" 57 #include "prims/jvm_misc.hpp" 58 #include "prims/jvmtiExport.hpp" 59 #include "prims/jvmtiThreadState.hpp" 60 #include "prims/nativeLookup.hpp" 61 #include "prims/stackwalk.hpp" 62 #include "runtime/arguments.hpp" 63 #include "runtime/atomic.hpp" 64 #include "runtime/handles.inline.hpp" 65 #include "runtime/init.hpp" 66 #include "runtime/interfaceSupport.inline.hpp" 67 #include "runtime/deoptimization.hpp" 68 #include "runtime/handshake.hpp" 69 #include "runtime/java.hpp" 70 #include "runtime/javaCalls.hpp" 71 #include "runtime/jfieldIDWorkaround.hpp" 72 #include "runtime/jniHandles.inline.hpp" 73 #include "runtime/orderAccess.hpp" 74 #include "runtime/os.inline.hpp" 75 #include "runtime/perfData.hpp" 76 #include "runtime/reflection.hpp" 77 #include "runtime/thread.inline.hpp" 78 #include "runtime/threadSMR.hpp" 79 #include "runtime/vframe.inline.hpp" 80 #include "runtime/vmOperations.hpp" 81 #include "runtime/vm_version.hpp" 82 #include "services/attachListener.hpp" 83 #include "services/management.hpp" 84 #include "services/threadService.hpp" 85 #include "utilities/copy.hpp" 86 #include "utilities/defaultStream.hpp" 87 #include "utilities/dtrace.hpp" 88 #include "utilities/events.hpp" 89 #include "utilities/histogram.hpp" 90 #include "utilities/macros.hpp" 91 #include "utilities/utf8.hpp" 92 #if INCLUDE_CDS 93 #include "classfile/systemDictionaryShared.hpp" 94 #endif 95 96 #include <errno.h> 97 98 /* 99 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 100 such ctors and calls MUST NOT come between an oop declaration/init and its 101 usage because if objects are move this may cause various memory stomps, bus 102 errors and segfaults. Here is a cookbook for causing so called "naked oop 103 failures": 104 105 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 106 JVMWrapper("JVM_GetClassDeclaredFields"); 107 108 // Object address to be held directly in mirror & not visible to GC 109 oop mirror = JNIHandles::resolve_non_null(ofClass); 110 111 // If this ctor can hit a safepoint, moving objects around, then 112 ComplexConstructor foo; 113 114 // Boom! mirror may point to JUNK instead of the intended object 115 (some dereference of mirror) 116 117 // Here's another call that may block for GC, making mirror stale 118 MutexLocker ml(some_lock); 119 120 // And here's an initializer that can result in a stale oop 121 // all in one step. 122 oop o = call_that_can_throw_exception(TRAPS); 123 124 125 The solution is to keep the oop declaration BELOW the ctor or function 126 call that might cause a GC, do another resolve to reassign the oop, or 127 consider use of a Handle instead of an oop so there is immunity from object 128 motion. But note that the "QUICK" entries below do not have a handlemark 129 and thus can only support use of handles passed in. 130 */ 131 132 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 133 ResourceMark rm; 134 int line_number = -1; 135 const char * source_file = NULL; 136 const char * trace = "explicit"; 137 InstanceKlass* caller = NULL; 138 JavaThread* jthread = JavaThread::current(); 139 if (jthread->has_last_Java_frame()) { 140 vframeStream vfst(jthread); 141 142 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 143 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController"); 144 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 145 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction"); 146 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 147 148 Method* last_caller = NULL; 149 150 while (!vfst.at_end()) { 151 Method* m = vfst.method(); 152 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 153 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 154 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 155 break; 156 } 157 last_caller = m; 158 vfst.next(); 159 } 160 // if this is called from Class.forName0 and that is called from Class.forName, 161 // then print the caller of Class.forName. If this is Class.loadClass, then print 162 // that caller, otherwise keep quiet since this should be picked up elsewhere. 163 bool found_it = false; 164 if (!vfst.at_end() && 165 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 166 vfst.method()->name() == vmSymbols::forName0_name()) { 167 vfst.next(); 168 if (!vfst.at_end() && 169 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 170 vfst.method()->name() == vmSymbols::forName_name()) { 171 vfst.next(); 172 found_it = true; 173 } 174 } else if (last_caller != NULL && 175 last_caller->method_holder()->name() == 176 vmSymbols::java_lang_ClassLoader() && 177 last_caller->name() == vmSymbols::loadClass_name()) { 178 found_it = true; 179 } else if (!vfst.at_end()) { 180 if (vfst.method()->is_native()) { 181 // JNI call 182 found_it = true; 183 } 184 } 185 if (found_it && !vfst.at_end()) { 186 // found the caller 187 caller = vfst.method()->method_holder(); 188 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 189 if (line_number == -1) { 190 // show method name if it's a native method 191 trace = vfst.method()->name_and_sig_as_C_string(); 192 } 193 Symbol* s = caller->source_file_name(); 194 if (s != NULL) { 195 source_file = s->as_C_string(); 196 } 197 } 198 } 199 if (caller != NULL) { 200 if (to_class != caller) { 201 const char * from = caller->external_name(); 202 const char * to = to_class->external_name(); 203 // print in a single call to reduce interleaving between threads 204 if (source_file != NULL) { 205 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 206 } else { 207 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 208 } 209 } 210 } 211 } 212 213 void trace_class_resolution(Klass* to_class) { 214 EXCEPTION_MARK; 215 trace_class_resolution_impl(to_class, THREAD); 216 if (HAS_PENDING_EXCEPTION) { 217 CLEAR_PENDING_EXCEPTION; 218 } 219 } 220 221 // Wrapper to trace JVM functions 222 223 #ifdef ASSERT 224 Histogram* JVMHistogram; 225 volatile int JVMHistogram_lock = 0; 226 227 class JVMHistogramElement : public HistogramElement { 228 public: 229 JVMHistogramElement(const char* name); 230 }; 231 232 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 233 _name = elementName; 234 uintx count = 0; 235 236 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 237 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 238 count +=1; 239 if ( (WarnOnStalledSpinLock > 0) 240 && (count % WarnOnStalledSpinLock == 0)) { 241 warning("JVMHistogram_lock seems to be stalled"); 242 } 243 } 244 } 245 246 if(JVMHistogram == NULL) 247 JVMHistogram = new Histogram("JVM Call Counts",100); 248 249 JVMHistogram->add_element(this); 250 Atomic::dec(&JVMHistogram_lock); 251 } 252 253 #define JVMCountWrapper(arg) \ 254 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 255 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 256 257 #define JVMWrapper(arg) JVMCountWrapper(arg); 258 #else 259 #define JVMWrapper(arg) 260 #endif 261 262 263 // Interface version ///////////////////////////////////////////////////////////////////// 264 265 266 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 267 return JVM_INTERFACE_VERSION; 268 JVM_END 269 270 271 // java.lang.System ////////////////////////////////////////////////////////////////////// 272 273 274 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 275 JVMWrapper("JVM_CurrentTimeMillis"); 276 return os::javaTimeMillis(); 277 JVM_END 278 279 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 280 JVMWrapper("JVM_NanoTime"); 281 return os::javaTimeNanos(); 282 JVM_END 283 284 // The function below is actually exposed by jdk.internal.misc.VM and not 285 // java.lang.System, but we choose to keep it here so that it stays next 286 // to JVM_CurrentTimeMillis and JVM_NanoTime 287 288 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 289 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 290 291 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 292 JVMWrapper("JVM_GetNanoTimeAdjustment"); 293 jlong seconds; 294 jlong nanos; 295 296 os::javaTimeSystemUTC(seconds, nanos); 297 298 // We're going to verify that the result can fit in a long. 299 // For that we need the difference in seconds between 'seconds' 300 // and 'offset_secs' to be such that: 301 // |seconds - offset_secs| < (2^63/10^9) 302 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 303 // which makes |seconds - offset_secs| < 2^33 304 // and we will prefer +/- 2^32 as the maximum acceptable diff 305 // as 2^32 has a more natural feel than 2^33... 306 // 307 // So if |seconds - offset_secs| >= 2^32 - we return a special 308 // sentinel value (-1) which the caller should take as an 309 // exception value indicating that the offset given to us is 310 // too far from range of the current time - leading to too big 311 // a nano adjustment. The caller is expected to recover by 312 // computing a more accurate offset and calling this method 313 // again. (For the record 2^32 secs is ~136 years, so that 314 // should rarely happen) 315 // 316 jlong diff = seconds - offset_secs; 317 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 318 return -1; // sentinel value: the offset is too far off the target 319 } 320 321 // return the adjustment. If you compute a time by adding 322 // this number of nanoseconds along with the number of seconds 323 // in the offset you should get the current UTC time. 324 return (diff * (jlong)1000000000) + nanos; 325 JVM_END 326 327 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 328 jobject dst, jint dst_pos, jint length)) 329 JVMWrapper("JVM_ArrayCopy"); 330 // Check if we have null pointers 331 if (src == NULL || dst == NULL) { 332 THROW(vmSymbols::java_lang_NullPointerException()); 333 } 334 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 335 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 336 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 337 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 338 // Do copy 339 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 340 JVM_END 341 342 343 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 344 JavaValue r(T_OBJECT); 345 // public synchronized Object put(Object key, Object value); 346 HandleMark hm(THREAD); 347 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 348 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 349 JavaCalls::call_virtual(&r, 350 props, 351 SystemDictionary::Properties_klass(), 352 vmSymbols::put_name(), 353 vmSymbols::object_object_object_signature(), 354 key_str, 355 value_str, 356 THREAD); 357 } 358 359 360 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 361 362 /* 363 * Return all of the system properties in a Java String array with alternating 364 * names and values from the jvm SystemProperty. 365 * Which includes some internal and all commandline -D defined properties. 366 */ 367 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 368 JVMWrapper("JVM_GetProperties"); 369 ResourceMark rm(THREAD); 370 HandleMark hm(THREAD); 371 int ndx = 0; 372 int fixedCount = 2; 373 374 SystemProperty* p = Arguments::system_properties(); 375 int count = Arguments::PropertyList_count(p); 376 377 // Allocate result String array 378 InstanceKlass* ik = SystemDictionary::String_klass(); 379 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 380 objArrayHandle result_h(THREAD, r); 381 382 while (p != NULL) { 383 const char * key = p->key(); 384 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 385 const char * value = p->value(); 386 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 387 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL); 388 result_h->obj_at_put(ndx * 2, key_str()); 389 result_h->obj_at_put(ndx * 2 + 1, value_str()); 390 ndx++; 391 } 392 p = p->next(); 393 } 394 395 // Convert the -XX:MaxDirectMemorySize= command line flag 396 // to the sun.nio.MaxDirectMemorySize property. 397 // Do this after setting user properties to prevent people 398 // from setting the value with a -D option, as requested. 399 // Leave empty if not supplied 400 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 401 char as_chars[256]; 402 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 403 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 404 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 405 result_h->obj_at_put(ndx * 2, key_str()); 406 result_h->obj_at_put(ndx * 2 + 1, value_str()); 407 ndx++; 408 } 409 410 // JVM monitoring and management support 411 // Add the sun.management.compiler property for the compiler's name 412 { 413 #undef CSIZE 414 #if defined(_LP64) || defined(_WIN64) 415 #define CSIZE "64-Bit " 416 #else 417 #define CSIZE 418 #endif // 64bit 419 420 #ifdef TIERED 421 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 422 #else 423 #if defined(COMPILER1) 424 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 425 #elif defined(COMPILER2) 426 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 427 #elif INCLUDE_JVMCI 428 #error "INCLUDE_JVMCI should imply TIERED" 429 #else 430 const char* compiler_name = ""; 431 #endif // compilers 432 #endif // TIERED 433 434 if (*compiler_name != '\0' && 435 (Arguments::mode() != Arguments::_int)) { 436 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 437 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 438 result_h->obj_at_put(ndx * 2, key_str()); 439 result_h->obj_at_put(ndx * 2 + 1, value_str()); 440 ndx++; 441 } 442 } 443 444 return (jobjectArray) JNIHandles::make_local(env, result_h()); 445 JVM_END 446 447 448 /* 449 * Return the temporary directory that the VM uses for the attach 450 * and perf data files. 451 * 452 * It is important that this directory is well-known and the 453 * same for all VM instances. It cannot be affected by configuration 454 * variables such as java.io.tmpdir. 455 */ 456 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 457 JVMWrapper("JVM_GetTemporaryDirectory"); 458 HandleMark hm(THREAD); 459 const char* temp_dir = os::get_temp_directory(); 460 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 461 return (jstring) JNIHandles::make_local(env, h()); 462 JVM_END 463 464 465 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 466 467 extern volatile jint vm_created; 468 469 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 470 JVMWrapper("JVM_BeforeHalt"); 471 EventShutdown event; 472 if (event.should_commit()) { 473 event.set_reason("Shutdown requested from Java"); 474 event.commit(); 475 } 476 JVM_END 477 478 479 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 480 before_exit(thread); 481 vm_exit(code); 482 JVM_END 483 484 485 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 486 JVMWrapper("JVM_GC"); 487 if (!DisableExplicitGC) { 488 Universe::heap()->collect(GCCause::_java_lang_system_gc); 489 } 490 JVM_END 491 492 493 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 494 JVMWrapper("JVM_MaxObjectInspectionAge"); 495 return Universe::heap()->millis_since_last_gc(); 496 JVM_END 497 498 499 static inline jlong convert_size_t_to_jlong(size_t val) { 500 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 501 NOT_LP64 (return (jlong)val;) 502 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 503 } 504 505 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 506 JVMWrapper("JVM_TotalMemory"); 507 size_t n = Universe::heap()->capacity(); 508 return convert_size_t_to_jlong(n); 509 JVM_END 510 511 512 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 513 JVMWrapper("JVM_FreeMemory"); 514 size_t n = Universe::heap()->unused(); 515 return convert_size_t_to_jlong(n); 516 JVM_END 517 518 519 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 520 JVMWrapper("JVM_MaxMemory"); 521 size_t n = Universe::heap()->max_capacity(); 522 return convert_size_t_to_jlong(n); 523 JVM_END 524 525 526 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 527 JVMWrapper("JVM_ActiveProcessorCount"); 528 return os::active_processor_count(); 529 JVM_END 530 531 532 533 // java.lang.Throwable ////////////////////////////////////////////////////// 534 535 536 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 537 JVMWrapper("JVM_FillInStackTrace"); 538 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 539 java_lang_Throwable::fill_in_stack_trace(exception); 540 JVM_END 541 542 543 // java.lang.StackTraceElement ////////////////////////////////////////////// 544 545 546 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 547 JVMWrapper("JVM_InitStackTraceElementArray"); 548 Handle exception(THREAD, JNIHandles::resolve(throwable)); 549 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 550 objArrayHandle stack_trace(THREAD, st); 551 // Fill in the allocated stack trace 552 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 553 JVM_END 554 555 556 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 557 JVMWrapper("JVM_InitStackTraceElement"); 558 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 559 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 560 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 561 JVM_END 562 563 564 // java.lang.StackWalker ////////////////////////////////////////////////////// 565 566 567 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 568 jint skip_frames, jint frame_count, jint start_index, 569 jobjectArray frames)) 570 JVMWrapper("JVM_CallStackWalk"); 571 JavaThread* jt = (JavaThread*) THREAD; 572 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 573 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 574 } 575 576 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 577 578 // frames array is a Class<?>[] array when only getting caller reference, 579 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 580 // be null. 581 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 582 objArrayHandle frames_array_h(THREAD, fa); 583 584 int limit = start_index + frame_count; 585 if (frames_array_h->length() < limit) { 586 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 587 } 588 589 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 590 start_index, frames_array_h, CHECK_NULL); 591 return JNIHandles::make_local(env, result); 592 JVM_END 593 594 595 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 596 jint frame_count, jint start_index, 597 jobjectArray frames)) 598 JVMWrapper("JVM_MoreStackWalk"); 599 JavaThread* jt = (JavaThread*) THREAD; 600 601 // frames array is a Class<?>[] array when only getting caller reference, 602 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 603 // be null. 604 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 605 objArrayHandle frames_array_h(THREAD, fa); 606 607 int limit = start_index+frame_count; 608 if (frames_array_h->length() < limit) { 609 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 610 } 611 612 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 613 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 614 start_index, frames_array_h, THREAD); 615 JVM_END 616 617 // java.lang.Object /////////////////////////////////////////////// 618 619 620 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 621 JVMWrapper("JVM_IHashCode"); 622 // as implemented in the classic virtual machine; return 0 if object is NULL 623 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 624 JVM_END 625 626 627 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 628 JVMWrapper("JVM_MonitorWait"); 629 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 630 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 631 if (JvmtiExport::should_post_monitor_wait()) { 632 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 633 634 // The current thread already owns the monitor and it has not yet 635 // been added to the wait queue so the current thread cannot be 636 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 637 // event handler cannot accidentally consume an unpark() meant for 638 // the ParkEvent associated with this ObjectMonitor. 639 } 640 ObjectSynchronizer::wait(obj, ms, CHECK); 641 JVM_END 642 643 644 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 645 JVMWrapper("JVM_MonitorNotify"); 646 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 647 ObjectSynchronizer::notify(obj, CHECK); 648 JVM_END 649 650 651 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 652 JVMWrapper("JVM_MonitorNotifyAll"); 653 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 654 ObjectSynchronizer::notifyall(obj, CHECK); 655 JVM_END 656 657 658 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 659 JVMWrapper("JVM_Clone"); 660 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 661 Klass* klass = obj->klass(); 662 JvmtiVMObjectAllocEventCollector oam; 663 664 #ifdef ASSERT 665 // Just checking that the cloneable flag is set correct 666 if (obj->is_array()) { 667 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 668 } else { 669 guarantee(obj->is_instance(), "should be instanceOop"); 670 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 671 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 672 } 673 #endif 674 675 // Check if class of obj supports the Cloneable interface. 676 // All arrays are considered to be cloneable (See JLS 20.1.5). 677 // All j.l.r.Reference classes are considered non-cloneable. 678 if (!klass->is_cloneable() || 679 (klass->is_instance_klass() && 680 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 681 ResourceMark rm(THREAD); 682 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 683 } 684 assert(!EnableValhalla || !obj->klass()->is_value(), "Clone disallowed on value type"); 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 = Universe::heap()->array_allocate(klass, size, length, 692 /* do_zero */ true, CHECK_NULL); 693 } else { 694 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 695 } 696 697 HeapAccess<>::clone(obj(), new_obj_oop, size); 698 699 Handle new_obj(THREAD, new_obj_oop); 700 // Caution: this involves a java upcall, so the clone should be 701 // "gc-robust" by this stage. 702 if (klass->has_finalizer()) { 703 assert(obj->is_instance(), "should be instanceOop"); 704 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 705 new_obj = Handle(THREAD, new_obj_oop); 706 } 707 708 return JNIHandles::make_local(env, new_obj()); 709 JVM_END 710 711 // java.io.File /////////////////////////////////////////////////////////////// 712 713 JVM_LEAF(char*, JVM_NativePath(char* path)) 714 JVMWrapper("JVM_NativePath"); 715 return os::native_path(path); 716 JVM_END 717 718 719 // Misc. class handling /////////////////////////////////////////////////////////// 720 721 722 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 723 JVMWrapper("JVM_GetCallerClass"); 724 725 // Getting the class of the caller frame. 726 // 727 // The call stack at this point looks something like this: 728 // 729 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 730 // [1] [ @CallerSensitive API.method ] 731 // [.] [ (skipped intermediate frames) ] 732 // [n] [ caller ] 733 vframeStream vfst(thread); 734 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 735 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 736 Method* m = vfst.method(); 737 assert(m != NULL, "sanity"); 738 switch (n) { 739 case 0: 740 // This must only be called from Reflection.getCallerClass 741 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 742 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 743 } 744 // fall-through 745 case 1: 746 // Frame 0 and 1 must be caller sensitive. 747 if (!m->caller_sensitive()) { 748 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 749 } 750 break; 751 default: 752 if (!m->is_ignored_by_security_stack_walk()) { 753 // We have reached the desired frame; return the holder class. 754 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 755 } 756 break; 757 } 758 } 759 return NULL; 760 JVM_END 761 762 763 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 764 JVMWrapper("JVM_FindPrimitiveClass"); 765 oop mirror = NULL; 766 BasicType t = name2type(utf); 767 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY && t != T_VALUETYPE) { 768 mirror = Universe::java_mirror(t); 769 } 770 if (mirror == NULL) { 771 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 772 } else { 773 return (jclass) JNIHandles::make_local(env, mirror); 774 } 775 JVM_END 776 777 778 // Returns a class loaded by the bootstrap class loader; or null 779 // if not found. ClassNotFoundException is not thrown. 780 // FindClassFromBootLoader is exported to the launcher for windows. 781 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 782 const char* name)) 783 JVMWrapper("JVM_FindClassFromBootLoader"); 784 785 // Java libraries should ensure that name is never null... 786 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 787 // It's impossible to create this class; the name cannot fit 788 // into the constant pool. 789 return NULL; 790 } 791 792 TempNewSymbol h_name = SymbolTable::new_symbol(name); 793 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 794 if (k == NULL) { 795 return NULL; 796 } 797 798 if (log_is_enabled(Debug, class, resolve)) { 799 trace_class_resolution(k); 800 } 801 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 802 JVM_END 803 804 // Find a class with this name in this loader, using the caller's protection domain. 805 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 806 jboolean init, jobject loader, 807 jclass caller)) 808 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 809 // Java libraries should ensure that name is never null... 810 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 811 // It's impossible to create this class; the name cannot fit 812 // into the constant pool. 813 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 814 } 815 816 TempNewSymbol h_name = SymbolTable::new_symbol(name); 817 818 oop loader_oop = JNIHandles::resolve(loader); 819 oop from_class = JNIHandles::resolve(caller); 820 oop protection_domain = NULL; 821 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 822 // NPE. Put it in another way, the bootstrap class loader has all permission and 823 // thus no checkPackageAccess equivalence in the VM class loader. 824 // The caller is also passed as NULL by the java code if there is no security 825 // manager to avoid the performance cost of getting the calling class. 826 if (from_class != NULL && loader_oop != NULL) { 827 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 828 } 829 830 Handle h_loader(THREAD, loader_oop); 831 Handle h_prot(THREAD, protection_domain); 832 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 833 h_prot, false, THREAD); 834 835 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 836 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 837 } 838 return result; 839 JVM_END 840 841 // Currently only called from the old verifier. 842 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 843 jboolean init, jclass from)) 844 JVMWrapper("JVM_FindClassFromClass"); 845 if (name == NULL) { 846 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 847 } 848 if ((int)strlen(name) > Symbol::max_length()) { 849 // It's impossible to create this class; the name cannot fit 850 // into the constant pool. 851 Exceptions::fthrow(THREAD_AND_LOCATION, 852 vmSymbols::java_lang_NoClassDefFoundError(), 853 "Class name exceeds maximum length of %d: %s", 854 Symbol::max_length(), 855 name); 856 return 0; 857 } 858 TempNewSymbol h_name = SymbolTable::new_symbol(name); 859 oop from_class_oop = JNIHandles::resolve(from); 860 Klass* from_class = (from_class_oop == NULL) 861 ? (Klass*)NULL 862 : java_lang_Class::as_Klass(from_class_oop); 863 oop class_loader = NULL; 864 oop protection_domain = NULL; 865 if (from_class != NULL) { 866 class_loader = from_class->class_loader(); 867 protection_domain = from_class->protection_domain(); 868 } 869 Handle h_loader(THREAD, class_loader); 870 Handle h_prot (THREAD, protection_domain); 871 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 872 h_prot, true, thread); 873 874 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 875 // this function is generally only used for class loading during verification. 876 ResourceMark rm; 877 oop from_mirror = JNIHandles::resolve_non_null(from); 878 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 879 const char * from_name = from_class->external_name(); 880 881 oop mirror = JNIHandles::resolve_non_null(result); 882 Klass* to_class = java_lang_Class::as_Klass(mirror); 883 const char * to = to_class->external_name(); 884 log_debug(class, resolve)("%s %s (verification)", from_name, to); 885 } 886 887 return result; 888 JVM_END 889 890 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 891 if (loader.is_null()) { 892 return; 893 } 894 895 // check whether the current caller thread holds the lock or not. 896 // If not, increment the corresponding counter 897 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 898 ObjectSynchronizer::owner_self) { 899 counter->inc(); 900 } 901 } 902 903 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 904 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 905 jobject loader, const jbyte *buf, 906 jsize len, jobject pd, const char *source, 907 TRAPS) { 908 if (source == NULL) source = "__JVM_DefineClass__"; 909 910 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 911 JavaThread* jt = (JavaThread*) THREAD; 912 913 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 914 ClassLoader::perf_define_appclass_selftime(), 915 ClassLoader::perf_define_appclasses(), 916 jt->get_thread_stat()->perf_recursion_counts_addr(), 917 jt->get_thread_stat()->perf_timers_addr(), 918 PerfClassTraceTime::DEFINE_CLASS); 919 920 if (UsePerfData) { 921 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 922 } 923 924 // Since exceptions can be thrown, class initialization can take place 925 // if name is NULL no check for class name in .class stream has to be made. 926 TempNewSymbol class_name = NULL; 927 if (name != NULL) { 928 const int str_len = (int)strlen(name); 929 if (str_len > Symbol::max_length()) { 930 // It's impossible to create this class; the name cannot fit 931 // into the constant pool. 932 Exceptions::fthrow(THREAD_AND_LOCATION, 933 vmSymbols::java_lang_NoClassDefFoundError(), 934 "Class name exceeds maximum length of %d: %s", 935 Symbol::max_length(), 936 name); 937 return 0; 938 } 939 class_name = SymbolTable::new_symbol(name, str_len); 940 } 941 942 ResourceMark rm(THREAD); 943 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 944 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 945 if (UsePerfData) { 946 is_lock_held_by_thread(class_loader, 947 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 948 THREAD); 949 } 950 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 951 Klass* k = SystemDictionary::resolve_from_stream(class_name, 952 class_loader, 953 protection_domain, 954 &st, 955 CHECK_NULL); 956 957 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 958 trace_class_resolution(k); 959 } 960 961 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 962 } 963 964 965 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 966 JVMWrapper("JVM_DefineClass"); 967 968 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 969 JVM_END 970 971 972 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 973 JVMWrapper("JVM_DefineClassWithSource"); 974 975 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 976 JVM_END 977 978 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 979 JVMWrapper("JVM_FindLoadedClass"); 980 ResourceMark rm(THREAD); 981 982 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 983 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 984 985 const char* str = java_lang_String::as_utf8_string(string()); 986 // Sanity check, don't expect null 987 if (str == NULL) return NULL; 988 989 const int str_len = (int)strlen(str); 990 if (str_len > Symbol::max_length()) { 991 // It's impossible to create this class; the name cannot fit 992 // into the constant pool. 993 return NULL; 994 } 995 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 996 997 // Security Note: 998 // The Java level wrapper will perform the necessary security check allowing 999 // us to pass the NULL as the initiating class loader. 1000 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1001 if (UsePerfData) { 1002 is_lock_held_by_thread(h_loader, 1003 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1004 THREAD); 1005 } 1006 1007 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1008 h_loader, 1009 Handle(), 1010 CHECK_NULL); 1011 #if INCLUDE_CDS 1012 if (k == NULL) { 1013 // If the class is not already loaded, try to see if it's in the shared 1014 // archive for the current classloader (h_loader). 1015 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1016 } 1017 #endif 1018 return (k == NULL) ? NULL : 1019 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1020 JVM_END 1021 1022 // Module support ////////////////////////////////////////////////////////////////////////////// 1023 1024 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1025 jstring location, const char* const* packages, jsize num_packages)) 1026 JVMWrapper("JVM_DefineModule"); 1027 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1028 JVM_END 1029 1030 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1031 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1032 Modules::set_bootloader_unnamed_module(module, CHECK); 1033 JVM_END 1034 1035 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1036 JVMWrapper("JVM_AddModuleExports"); 1037 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1038 JVM_END 1039 1040 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1041 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1042 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1043 JVM_END 1044 1045 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1046 JVMWrapper("JVM_AddModuleExportsToAll"); 1047 Modules::add_module_exports(from_module, package, NULL, CHECK); 1048 JVM_END 1049 1050 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1051 JVMWrapper("JVM_AddReadsModule"); 1052 Modules::add_reads_module(from_module, source_module, CHECK); 1053 JVM_END 1054 1055 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1056 1057 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1058 assert (cls != NULL, "illegal class"); 1059 JVMWrapper("JVM_InitClassName"); 1060 JvmtiVMObjectAllocEventCollector oam; 1061 ResourceMark rm(THREAD); 1062 HandleMark hm(THREAD); 1063 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1064 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1065 return (jstring) JNIHandles::make_local(env, result); 1066 JVM_END 1067 1068 1069 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1070 JVMWrapper("JVM_GetClassInterfaces"); 1071 JvmtiVMObjectAllocEventCollector oam; 1072 oop mirror = JNIHandles::resolve_non_null(cls); 1073 1074 // Special handling for primitive objects 1075 if (java_lang_Class::is_primitive(mirror)) { 1076 // Primitive objects does not have any interfaces 1077 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1078 return (jobjectArray) JNIHandles::make_local(env, r); 1079 } 1080 1081 Klass* klass = java_lang_Class::as_Klass(mirror); 1082 // Figure size of result array 1083 int size; 1084 if (klass->is_instance_klass()) { 1085 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1086 } else { 1087 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1088 size = 2; 1089 } 1090 1091 // Allocate result array 1092 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1093 objArrayHandle result (THREAD, r); 1094 // Fill in result 1095 if (klass->is_instance_klass()) { 1096 // Regular instance klass, fill in all local interfaces 1097 for (int index = 0; index < size; index++) { 1098 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1099 result->obj_at_put(index, k->java_mirror()); 1100 } 1101 } else { 1102 // All arrays implement java.lang.Cloneable and java.io.Serializable 1103 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1104 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1105 } 1106 return (jobjectArray) JNIHandles::make_local(env, result()); 1107 JVM_END 1108 1109 1110 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1111 JVMWrapper("JVM_IsInterface"); 1112 oop mirror = JNIHandles::resolve_non_null(cls); 1113 if (java_lang_Class::is_primitive(mirror)) { 1114 return JNI_FALSE; 1115 } 1116 Klass* k = java_lang_Class::as_Klass(mirror); 1117 jboolean result = k->is_interface(); 1118 assert(!result || k->is_instance_klass(), 1119 "all interfaces are instance types"); 1120 // The compiler intrinsic for isInterface tests the 1121 // Klass::_access_flags bits in the same way. 1122 return result; 1123 JVM_END 1124 1125 1126 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1127 JVMWrapper("JVM_GetClassSigners"); 1128 JvmtiVMObjectAllocEventCollector oam; 1129 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1130 // There are no signers for primitive types 1131 return NULL; 1132 } 1133 1134 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls))); 1135 1136 // If there are no signers set in the class, or if the class 1137 // is an array, return NULL. 1138 if (signers == NULL) return NULL; 1139 1140 // copy of the signers array 1141 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1142 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1143 for (int index = 0; index < signers->length(); index++) { 1144 signers_copy->obj_at_put(index, signers->obj_at(index)); 1145 } 1146 1147 // return the copy 1148 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1149 JVM_END 1150 1151 1152 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1153 JVMWrapper("JVM_SetClassSigners"); 1154 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1155 // This call is ignored for primitive types and arrays. 1156 // Signers are only set once, ClassLoader.java, and thus shouldn't 1157 // be called with an array. Only the bootstrap loader creates arrays. 1158 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1159 if (k->is_instance_klass()) { 1160 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1161 } 1162 } 1163 JVM_END 1164 1165 1166 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1167 JVMWrapper("JVM_GetProtectionDomain"); 1168 if (JNIHandles::resolve(cls) == NULL) { 1169 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1170 } 1171 1172 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1173 // Primitive types does not have a protection domain. 1174 return NULL; 1175 } 1176 1177 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1178 return (jobject) JNIHandles::make_local(env, pd); 1179 JVM_END 1180 1181 1182 // Returns the inherited_access_control_context field of the running thread. 1183 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1184 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1185 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1186 return JNIHandles::make_local(env, result); 1187 JVM_END 1188 1189 class RegisterArrayForGC { 1190 private: 1191 JavaThread *_thread; 1192 public: 1193 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1194 _thread = thread; 1195 _thread->register_array_for_gc(array); 1196 } 1197 1198 ~RegisterArrayForGC() { 1199 _thread->register_array_for_gc(NULL); 1200 } 1201 }; 1202 1203 1204 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1205 JVMWrapper("JVM_GetStackAccessControlContext"); 1206 if (!UsePrivilegedStack) return NULL; 1207 1208 ResourceMark rm(THREAD); 1209 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1210 JvmtiVMObjectAllocEventCollector oam; 1211 1212 // count the protection domains on the execution stack. We collapse 1213 // duplicate consecutive protection domains into a single one, as 1214 // well as stopping when we hit a privileged frame. 1215 1216 oop previous_protection_domain = NULL; 1217 Handle privileged_context(thread, NULL); 1218 bool is_privileged = false; 1219 oop protection_domain = NULL; 1220 1221 // Iterate through Java frames 1222 vframeStream vfst(thread); 1223 for(; !vfst.at_end(); vfst.next()) { 1224 // get method of frame 1225 Method* method = vfst.method(); 1226 1227 // stop at the first privileged frame 1228 if (method->method_holder() == SystemDictionary::AccessController_klass() && 1229 method->name() == vmSymbols::executePrivileged_name()) 1230 { 1231 // this frame is privileged 1232 is_privileged = true; 1233 1234 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1235 1236 StackValueCollection* locals = priv->locals(); 1237 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1238 StackValue* clr_sv = locals->at(2); // Class<?> caller 1239 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1240 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1241 privileged_context = ctx_sv->get_obj(); 1242 Handle caller = clr_sv->get_obj(); 1243 1244 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1245 protection_domain = caller_klass->protection_domain(); 1246 } else { 1247 protection_domain = method->method_holder()->protection_domain(); 1248 } 1249 1250 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) { 1251 local_array->push(protection_domain); 1252 previous_protection_domain = protection_domain; 1253 } 1254 1255 if (is_privileged) break; 1256 } 1257 1258 1259 // either all the domains on the stack were system domains, or 1260 // we had a privileged system domain 1261 if (local_array->is_empty()) { 1262 if (is_privileged && privileged_context.is_null()) return NULL; 1263 1264 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1265 return JNIHandles::make_local(env, result); 1266 } 1267 1268 // the resource area must be registered in case of a gc 1269 RegisterArrayForGC ragc(thread, local_array); 1270 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1271 local_array->length(), CHECK_NULL); 1272 objArrayHandle h_context(thread, context); 1273 for (int index = 0; index < local_array->length(); index++) { 1274 h_context->obj_at_put(index, local_array->at(index)); 1275 } 1276 1277 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1278 1279 return JNIHandles::make_local(env, result); 1280 JVM_END 1281 1282 1283 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1284 JVMWrapper("JVM_IsArrayClass"); 1285 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1286 return (k != NULL) && k->is_array_klass() ? true : false; 1287 JVM_END 1288 1289 1290 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1291 JVMWrapper("JVM_IsPrimitiveClass"); 1292 oop mirror = JNIHandles::resolve_non_null(cls); 1293 return (jboolean) java_lang_Class::is_primitive(mirror); 1294 JVM_END 1295 1296 1297 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1298 JVMWrapper("JVM_GetClassModifiers"); 1299 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1300 // Primitive type 1301 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1302 } 1303 1304 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1305 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1306 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1307 return k->modifier_flags(); 1308 JVM_END 1309 1310 1311 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1312 1313 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1314 JvmtiVMObjectAllocEventCollector oam; 1315 // ofClass is a reference to a java_lang_Class object. The mirror object 1316 // of an InstanceKlass 1317 1318 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1319 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1320 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1321 return (jobjectArray)JNIHandles::make_local(env, result); 1322 } 1323 1324 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1325 InnerClassesIterator iter(k); 1326 1327 if (iter.length() == 0) { 1328 // Neither an inner nor outer class 1329 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1330 return (jobjectArray)JNIHandles::make_local(env, result); 1331 } 1332 1333 // find inner class info 1334 constantPoolHandle cp(thread, k->constants()); 1335 int length = iter.length(); 1336 1337 // Allocate temp. result array 1338 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1339 objArrayHandle result (THREAD, r); 1340 int members = 0; 1341 1342 for (; !iter.done(); iter.next()) { 1343 int ioff = iter.inner_class_info_index(); 1344 int ooff = iter.outer_class_info_index(); 1345 1346 if (ioff != 0 && ooff != 0) { 1347 // Check to see if the name matches the class we're looking for 1348 // before attempting to find the class. 1349 if (cp->klass_name_at_matches(k, ooff)) { 1350 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1351 if (outer_klass == k) { 1352 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1353 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1354 1355 // Throws an exception if outer klass has not declared k as 1356 // an inner klass 1357 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1358 1359 result->obj_at_put(members, inner_klass->java_mirror()); 1360 members++; 1361 } 1362 } 1363 } 1364 } 1365 1366 if (members != length) { 1367 // Return array of right length 1368 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1369 for(int i = 0; i < members; i++) { 1370 res->obj_at_put(i, result->obj_at(i)); 1371 } 1372 return (jobjectArray)JNIHandles::make_local(env, res); 1373 } 1374 1375 return (jobjectArray)JNIHandles::make_local(env, result()); 1376 JVM_END 1377 1378 1379 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1380 { 1381 // ofClass is a reference to a java_lang_Class object. 1382 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1383 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1384 return NULL; 1385 } 1386 1387 bool inner_is_member = false; 1388 Klass* outer_klass 1389 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1390 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1391 if (outer_klass == NULL) return NULL; // already a top-level class 1392 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1393 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1394 } 1395 JVM_END 1396 1397 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1398 { 1399 oop mirror = JNIHandles::resolve_non_null(cls); 1400 if (java_lang_Class::is_primitive(mirror) || 1401 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1402 return NULL; 1403 } 1404 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1405 int ooff = 0, noff = 0; 1406 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1407 if (noff != 0) { 1408 constantPoolHandle i_cp(thread, k->constants()); 1409 Symbol* name = i_cp->symbol_at(noff); 1410 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1411 return (jstring) JNIHandles::make_local(env, str()); 1412 } 1413 } 1414 return NULL; 1415 } 1416 JVM_END 1417 1418 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1419 assert (cls != NULL, "illegal class"); 1420 JVMWrapper("JVM_GetClassSignature"); 1421 JvmtiVMObjectAllocEventCollector oam; 1422 ResourceMark rm(THREAD); 1423 // Return null for arrays and primatives 1424 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1425 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1426 if (k->is_instance_klass()) { 1427 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1428 if (sym == NULL) return NULL; 1429 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1430 return (jstring) JNIHandles::make_local(env, str()); 1431 } 1432 } 1433 return NULL; 1434 JVM_END 1435 1436 1437 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1438 assert (cls != NULL, "illegal class"); 1439 JVMWrapper("JVM_GetClassAnnotations"); 1440 1441 // Return null for arrays and primitives 1442 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1443 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1444 if (k->is_instance_klass()) { 1445 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1446 return (jbyteArray) JNIHandles::make_local(env, a); 1447 } 1448 } 1449 return NULL; 1450 JVM_END 1451 1452 1453 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1454 // some of this code was adapted from from jni_FromReflectedField 1455 1456 oop reflected = JNIHandles::resolve_non_null(field); 1457 oop mirror = java_lang_reflect_Field::clazz(reflected); 1458 Klass* k = java_lang_Class::as_Klass(mirror); 1459 int slot = java_lang_reflect_Field::slot(reflected); 1460 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1461 1462 InstanceKlass* ik = InstanceKlass::cast(k); 1463 intptr_t offset = ik->field_offset(slot); 1464 1465 if (modifiers & JVM_ACC_STATIC) { 1466 // for static fields we only look in the current class 1467 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1468 assert(false, "cannot find static field"); 1469 return false; 1470 } 1471 } else { 1472 // for instance fields we start with the current class and work 1473 // our way up through the superclass chain 1474 if (!ik->find_field_from_offset(offset, false, &fd)) { 1475 assert(false, "cannot find instance field"); 1476 return false; 1477 } 1478 } 1479 return true; 1480 } 1481 1482 static Method* jvm_get_method_common(jobject method) { 1483 // some of this code was adapted from from jni_FromReflectedMethod 1484 1485 oop reflected = JNIHandles::resolve_non_null(method); 1486 oop mirror = NULL; 1487 int slot = 0; 1488 1489 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1490 mirror = java_lang_reflect_Constructor::clazz(reflected); 1491 slot = java_lang_reflect_Constructor::slot(reflected); 1492 } else { 1493 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1494 "wrong type"); 1495 mirror = java_lang_reflect_Method::clazz(reflected); 1496 slot = java_lang_reflect_Method::slot(reflected); 1497 } 1498 Klass* k = java_lang_Class::as_Klass(mirror); 1499 1500 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1501 assert(m != NULL, "cannot find method"); 1502 return m; // caller has to deal with NULL in product mode 1503 } 1504 1505 /* Type use annotations support (JDK 1.8) */ 1506 1507 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1508 assert (cls != NULL, "illegal class"); 1509 JVMWrapper("JVM_GetClassTypeAnnotations"); 1510 ResourceMark rm(THREAD); 1511 // Return null for arrays and primitives 1512 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1513 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1514 if (k->is_instance_klass()) { 1515 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1516 if (type_annotations != NULL) { 1517 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1518 return (jbyteArray) JNIHandles::make_local(env, a); 1519 } 1520 } 1521 } 1522 return NULL; 1523 JVM_END 1524 1525 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1526 assert (method != NULL, "illegal method"); 1527 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1528 1529 // method is a handle to a java.lang.reflect.Method object 1530 Method* m = jvm_get_method_common(method); 1531 if (m == NULL) { 1532 return NULL; 1533 } 1534 1535 AnnotationArray* type_annotations = m->type_annotations(); 1536 if (type_annotations != NULL) { 1537 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1538 return (jbyteArray) JNIHandles::make_local(env, a); 1539 } 1540 1541 return NULL; 1542 JVM_END 1543 1544 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1545 assert (field != NULL, "illegal field"); 1546 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1547 1548 fieldDescriptor fd; 1549 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1550 if (!gotFd) { 1551 return NULL; 1552 } 1553 1554 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1555 JVM_END 1556 1557 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1558 if (!cp->is_within_bounds(index)) { 1559 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1560 } 1561 } 1562 1563 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1564 { 1565 JVMWrapper("JVM_GetMethodParameters"); 1566 // method is a handle to a java.lang.reflect.Method object 1567 Method* method_ptr = jvm_get_method_common(method); 1568 methodHandle mh (THREAD, method_ptr); 1569 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1570 const int num_params = mh->method_parameters_length(); 1571 1572 if (num_params < 0) { 1573 // A -1 return value from method_parameters_length means there is no 1574 // parameter data. Return null to indicate this to the reflection 1575 // API. 1576 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1577 return (jobjectArray)NULL; 1578 } else { 1579 // Otherwise, we return something up to reflection, even if it is 1580 // a zero-length array. Why? Because in some cases this can 1581 // trigger a MalformedParametersException. 1582 1583 // make sure all the symbols are properly formatted 1584 for (int i = 0; i < num_params; i++) { 1585 MethodParametersElement* params = mh->method_parameters_start(); 1586 int index = params[i].name_cp_index; 1587 bounds_check(mh->constants(), index, CHECK_NULL); 1588 1589 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1590 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1591 "Wrong type at constant pool index"); 1592 } 1593 1594 } 1595 1596 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1597 objArrayHandle result (THREAD, result_oop); 1598 1599 for (int i = 0; i < num_params; i++) { 1600 MethodParametersElement* params = mh->method_parameters_start(); 1601 // For a 0 index, give a NULL symbol 1602 Symbol* sym = 0 != params[i].name_cp_index ? 1603 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1604 int flags = params[i].flags; 1605 oop param = Reflection::new_parameter(reflected_method, i, sym, 1606 flags, CHECK_NULL); 1607 result->obj_at_put(i, param); 1608 } 1609 return (jobjectArray)JNIHandles::make_local(env, result()); 1610 } 1611 } 1612 JVM_END 1613 1614 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1615 1616 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1617 { 1618 JVMWrapper("JVM_GetClassDeclaredFields"); 1619 JvmtiVMObjectAllocEventCollector oam; 1620 1621 // Exclude primitive types and array types 1622 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1623 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1624 // Return empty array 1625 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1626 return (jobjectArray) JNIHandles::make_local(env, res); 1627 } 1628 1629 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1630 constantPoolHandle cp(THREAD, k->constants()); 1631 1632 // Ensure class is linked 1633 k->link_class(CHECK_NULL); 1634 1635 // Allocate result 1636 int num_fields; 1637 1638 if (publicOnly) { 1639 num_fields = 0; 1640 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1641 if (fs.access_flags().is_public()) ++num_fields; 1642 } 1643 } else { 1644 num_fields = k->java_fields_count(); 1645 } 1646 1647 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1648 objArrayHandle result (THREAD, r); 1649 1650 int out_idx = 0; 1651 fieldDescriptor fd; 1652 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1653 if (!publicOnly || fs.access_flags().is_public()) { 1654 fd.reinitialize(k, fs.index()); 1655 oop field = Reflection::new_field(&fd, CHECK_NULL); 1656 result->obj_at_put(out_idx, field); 1657 ++out_idx; 1658 } 1659 } 1660 assert(out_idx == num_fields, "just checking"); 1661 return (jobjectArray) JNIHandles::make_local(env, result()); 1662 } 1663 JVM_END 1664 1665 static bool select_method(const methodHandle& method, bool want_constructor) { 1666 bool is_ctor = (method->is_object_constructor() || 1667 method->is_static_init_factory()); 1668 if (want_constructor) { 1669 return is_ctor; 1670 } else { 1671 return (!is_ctor && 1672 !method->is_class_initializer() && 1673 !method->is_overpass()); 1674 } 1675 } 1676 1677 static jobjectArray get_class_declared_methods_helper( 1678 JNIEnv *env, 1679 jclass ofClass, jboolean publicOnly, 1680 bool want_constructor, 1681 Klass* klass, TRAPS) { 1682 1683 JvmtiVMObjectAllocEventCollector oam; 1684 1685 // Exclude primitive types and array types 1686 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1687 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1688 // Return empty array 1689 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1690 return (jobjectArray) JNIHandles::make_local(env, res); 1691 } 1692 1693 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1694 1695 // Ensure class is linked 1696 k->link_class(CHECK_NULL); 1697 1698 Array<Method*>* methods = k->methods(); 1699 int methods_length = methods->length(); 1700 1701 // Save original method_idnum in case of redefinition, which can change 1702 // the idnum of obsolete methods. The new method will have the same idnum 1703 // but if we refresh the methods array, the counts will be wrong. 1704 ResourceMark rm(THREAD); 1705 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1706 int num_methods = 0; 1707 1708 for (int i = 0; i < methods_length; i++) { 1709 methodHandle method(THREAD, methods->at(i)); 1710 if (select_method(method, want_constructor)) { 1711 if (!publicOnly || method->is_public()) { 1712 idnums->push(method->method_idnum()); 1713 ++num_methods; 1714 } 1715 } 1716 } 1717 1718 // Allocate result 1719 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1720 objArrayHandle result (THREAD, r); 1721 1722 // Now just put the methods that we selected above, but go by their idnum 1723 // in case of redefinition. The methods can be redefined at any safepoint, 1724 // so above when allocating the oop array and below when creating reflect 1725 // objects. 1726 for (int i = 0; i < num_methods; i++) { 1727 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1728 if (method.is_null()) { 1729 // Method may have been deleted and seems this API can handle null 1730 // Otherwise should probably put a method that throws NSME 1731 result->obj_at_put(i, NULL); 1732 } else { 1733 oop m; 1734 if (want_constructor) { 1735 assert(method->is_object_constructor() || 1736 method->is_static_init_factory(), "must be"); 1737 m = Reflection::new_constructor(method, CHECK_NULL); 1738 } else { 1739 m = Reflection::new_method(method, false, CHECK_NULL); 1740 } 1741 result->obj_at_put(i, m); 1742 } 1743 } 1744 1745 return (jobjectArray) JNIHandles::make_local(env, result()); 1746 } 1747 1748 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1749 { 1750 JVMWrapper("JVM_GetClassDeclaredMethods"); 1751 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1752 /*want_constructor*/ false, 1753 SystemDictionary::reflect_Method_klass(), THREAD); 1754 } 1755 JVM_END 1756 1757 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1758 { 1759 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1760 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1761 /*want_constructor*/ true, 1762 SystemDictionary::reflect_Constructor_klass(), THREAD); 1763 } 1764 JVM_END 1765 1766 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1767 { 1768 JVMWrapper("JVM_GetClassAccessFlags"); 1769 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1770 // Primitive type 1771 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1772 } 1773 1774 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1775 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1776 } 1777 JVM_END 1778 1779 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1780 { 1781 JVMWrapper("JVM_AreNestMates"); 1782 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1783 assert(c->is_instance_klass(), "must be"); 1784 InstanceKlass* ck = InstanceKlass::cast(c); 1785 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 1786 assert(m->is_instance_klass(), "must be"); 1787 InstanceKlass* mk = InstanceKlass::cast(m); 1788 return ck->has_nestmate_access_to(mk, THREAD); 1789 } 1790 JVM_END 1791 1792 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1793 { 1794 // current is not a primitive or array class 1795 JVMWrapper("JVM_GetNestHost"); 1796 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1797 assert(c->is_instance_klass(), "must be"); 1798 InstanceKlass* ck = InstanceKlass::cast(c); 1799 // Don't post exceptions if validation fails 1800 InstanceKlass* host = ck->nest_host(NULL, THREAD); 1801 return (jclass) (host == NULL ? NULL : 1802 JNIHandles::make_local(THREAD, host->java_mirror())); 1803 } 1804 JVM_END 1805 1806 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1807 { 1808 // current is not a primitive or array class 1809 JVMWrapper("JVM_GetNestMembers"); 1810 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1811 assert(c->is_instance_klass(), "must be"); 1812 InstanceKlass* ck = InstanceKlass::cast(c); 1813 // Get the nest host for this nest - throw ICCE if validation fails 1814 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError(); 1815 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL); 1816 1817 { 1818 JvmtiVMObjectAllocEventCollector oam; 1819 Array<u2>* members = host->nest_members(); 1820 int length = members == NULL ? 0 : members->length(); 1821 // nest host is first in the array so make it one bigger 1822 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 1823 length + 1, CHECK_NULL); 1824 objArrayHandle result (THREAD, r); 1825 result->obj_at_put(0, host->java_mirror()); 1826 if (length != 0) { 1827 int i; 1828 for (i = 0; i < length; i++) { 1829 int cp_index = members->at(i); 1830 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL); 1831 if (k->is_instance_klass()) { 1832 InstanceKlass* nest_host_k = 1833 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL); 1834 if (nest_host_k == host) { 1835 result->obj_at_put(i+1, k->java_mirror()); 1836 } 1837 else { 1838 // k's nest host is legal but it isn't our host so 1839 // throw ICCE 1840 ResourceMark rm(THREAD); 1841 Exceptions::fthrow(THREAD_AND_LOCATION, 1842 icce, 1843 "Nest member %s in %s declares a different nest host of %s", 1844 k->external_name(), 1845 host->external_name(), 1846 nest_host_k->external_name() 1847 ); 1848 return NULL; 1849 } 1850 } 1851 else { 1852 // we have a bad nest member entry - throw ICCE 1853 ResourceMark rm(THREAD); 1854 Exceptions::fthrow(THREAD_AND_LOCATION, 1855 icce, 1856 "Class %s can not be a nest member of %s", 1857 k->external_name(), 1858 host->external_name() 1859 ); 1860 return NULL; 1861 } 1862 } 1863 } 1864 else { 1865 assert(host == ck, "must be singleton nest"); 1866 } 1867 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1868 } 1869 } 1870 JVM_END 1871 1872 // Constant pool access ////////////////////////////////////////////////////////// 1873 1874 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1875 { 1876 JVMWrapper("JVM_GetClassConstantPool"); 1877 JvmtiVMObjectAllocEventCollector oam; 1878 1879 // Return null for primitives and arrays 1880 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1881 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1882 if (k->is_instance_klass()) { 1883 InstanceKlass* k_h = InstanceKlass::cast(k); 1884 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1885 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1886 return JNIHandles::make_local(jcp()); 1887 } 1888 } 1889 return NULL; 1890 } 1891 JVM_END 1892 1893 1894 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1895 { 1896 JVMWrapper("JVM_ConstantPoolGetSize"); 1897 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1898 return cp->length(); 1899 } 1900 JVM_END 1901 1902 1903 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1904 { 1905 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1906 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1907 bounds_check(cp, index, CHECK_NULL); 1908 constantTag tag = cp->tag_at(index); 1909 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1910 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1911 } 1912 Klass* k = cp->klass_at(index, CHECK_NULL); 1913 return (jclass) JNIHandles::make_local(k->java_mirror()); 1914 } 1915 JVM_END 1916 1917 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1918 { 1919 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1920 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1921 bounds_check(cp, index, CHECK_NULL); 1922 constantTag tag = cp->tag_at(index); 1923 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1924 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1925 } 1926 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1927 if (k == NULL) return NULL; 1928 return (jclass) JNIHandles::make_local(k->java_mirror()); 1929 } 1930 JVM_END 1931 1932 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 1933 constantTag tag = cp->tag_at(index); 1934 if (!tag.is_method() && !tag.is_interface_method()) { 1935 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1936 } 1937 int klass_ref = cp->uncached_klass_ref_index_at(index); 1938 Klass* k_o; 1939 if (force_resolution) { 1940 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1941 } else { 1942 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1943 if (k_o == NULL) return NULL; 1944 } 1945 InstanceKlass* k = InstanceKlass::cast(k_o); 1946 Symbol* name = cp->uncached_name_ref_at(index); 1947 Symbol* sig = cp->uncached_signature_ref_at(index); 1948 methodHandle m (THREAD, k->find_method(name, sig)); 1949 if (m.is_null()) { 1950 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1951 } 1952 oop method; 1953 if (m->is_object_constructor()) { 1954 method = Reflection::new_constructor(m, CHECK_NULL); 1955 } else { 1956 method = Reflection::new_method(m, true, CHECK_NULL); 1957 } 1958 return JNIHandles::make_local(method); 1959 } 1960 1961 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1962 { 1963 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1964 JvmtiVMObjectAllocEventCollector oam; 1965 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1966 bounds_check(cp, index, CHECK_NULL); 1967 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1968 return res; 1969 } 1970 JVM_END 1971 1972 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1973 { 1974 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 1975 JvmtiVMObjectAllocEventCollector oam; 1976 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1977 bounds_check(cp, index, CHECK_NULL); 1978 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 1979 return res; 1980 } 1981 JVM_END 1982 1983 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1984 constantTag tag = cp->tag_at(index); 1985 if (!tag.is_field()) { 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 InstanceKlass* k = InstanceKlass::cast(k_o); 1997 Symbol* name = cp->uncached_name_ref_at(index); 1998 Symbol* sig = cp->uncached_signature_ref_at(index); 1999 fieldDescriptor fd; 2000 Klass* target_klass = k->find_field(name, sig, &fd); 2001 if (target_klass == NULL) { 2002 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2003 } 2004 oop field = Reflection::new_field(&fd, CHECK_NULL); 2005 return JNIHandles::make_local(field); 2006 } 2007 2008 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2009 { 2010 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2011 JvmtiVMObjectAllocEventCollector oam; 2012 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2013 bounds_check(cp, index, CHECK_NULL); 2014 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2015 return res; 2016 } 2017 JVM_END 2018 2019 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2020 { 2021 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2022 JvmtiVMObjectAllocEventCollector oam; 2023 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2024 bounds_check(cp, index, CHECK_NULL); 2025 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2026 return res; 2027 } 2028 JVM_END 2029 2030 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2031 { 2032 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2033 JvmtiVMObjectAllocEventCollector oam; 2034 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2035 bounds_check(cp, index, CHECK_NULL); 2036 constantTag tag = cp->tag_at(index); 2037 if (!tag.is_field_or_method()) { 2038 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2039 } 2040 int klass_ref = cp->uncached_klass_ref_index_at(index); 2041 Symbol* klass_name = cp->klass_name_at(klass_ref); 2042 Symbol* member_name = cp->uncached_name_ref_at(index); 2043 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2044 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2045 objArrayHandle dest(THREAD, dest_o); 2046 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2047 dest->obj_at_put(0, str()); 2048 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2049 dest->obj_at_put(1, str()); 2050 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2051 dest->obj_at_put(2, str()); 2052 return (jobjectArray) JNIHandles::make_local(dest()); 2053 } 2054 JVM_END 2055 2056 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2057 { 2058 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2059 JvmtiVMObjectAllocEventCollector oam; 2060 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2061 bounds_check(cp, index, CHECK_0); 2062 constantTag tag = cp->tag_at(index); 2063 if (!tag.is_field_or_method()) { 2064 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2065 } 2066 return (jint) cp->uncached_klass_ref_index_at(index); 2067 } 2068 JVM_END 2069 2070 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2071 { 2072 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2073 JvmtiVMObjectAllocEventCollector oam; 2074 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2075 bounds_check(cp, index, CHECK_0); 2076 constantTag tag = cp->tag_at(index); 2077 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2078 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2079 } 2080 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2081 } 2082 JVM_END 2083 2084 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2085 { 2086 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2087 JvmtiVMObjectAllocEventCollector oam; 2088 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2089 bounds_check(cp, index, CHECK_NULL); 2090 constantTag tag = cp->tag_at(index); 2091 if (!tag.is_name_and_type()) { 2092 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2093 } 2094 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2095 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2096 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2097 objArrayHandle dest(THREAD, dest_o); 2098 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2099 dest->obj_at_put(0, str()); 2100 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2101 dest->obj_at_put(1, str()); 2102 return (jobjectArray) JNIHandles::make_local(dest()); 2103 } 2104 JVM_END 2105 2106 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2107 { 2108 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2109 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2110 bounds_check(cp, index, CHECK_0); 2111 constantTag tag = cp->tag_at(index); 2112 if (!tag.is_int()) { 2113 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2114 } 2115 return cp->int_at(index); 2116 } 2117 JVM_END 2118 2119 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2120 { 2121 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2122 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2123 bounds_check(cp, index, CHECK_(0L)); 2124 constantTag tag = cp->tag_at(index); 2125 if (!tag.is_long()) { 2126 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2127 } 2128 return cp->long_at(index); 2129 } 2130 JVM_END 2131 2132 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2133 { 2134 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2135 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2136 bounds_check(cp, index, CHECK_(0.0f)); 2137 constantTag tag = cp->tag_at(index); 2138 if (!tag.is_float()) { 2139 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2140 } 2141 return cp->float_at(index); 2142 } 2143 JVM_END 2144 2145 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2146 { 2147 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2148 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2149 bounds_check(cp, index, CHECK_(0.0)); 2150 constantTag tag = cp->tag_at(index); 2151 if (!tag.is_double()) { 2152 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2153 } 2154 return cp->double_at(index); 2155 } 2156 JVM_END 2157 2158 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2159 { 2160 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2161 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2162 bounds_check(cp, index, CHECK_NULL); 2163 constantTag tag = cp->tag_at(index); 2164 if (!tag.is_string()) { 2165 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2166 } 2167 oop str = cp->string_at(index, CHECK_NULL); 2168 return (jstring) JNIHandles::make_local(str); 2169 } 2170 JVM_END 2171 2172 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2173 { 2174 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2175 JvmtiVMObjectAllocEventCollector oam; 2176 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2177 bounds_check(cp, index, CHECK_NULL); 2178 constantTag tag = cp->tag_at(index); 2179 if (!tag.is_symbol()) { 2180 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2181 } 2182 Symbol* sym = cp->symbol_at(index); 2183 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2184 return (jstring) JNIHandles::make_local(str()); 2185 } 2186 JVM_END 2187 2188 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2189 { 2190 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2191 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2192 bounds_check(cp, index, CHECK_0); 2193 constantTag tag = cp->tag_at(index); 2194 jbyte result = tag.value(); 2195 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2196 // they are changed to the corresponding tags from the JVM spec, so that java code in 2197 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2198 if (tag.is_klass_or_reference()) { 2199 result = JVM_CONSTANT_Class; 2200 } else if (tag.is_string_index()) { 2201 result = JVM_CONSTANT_String; 2202 } else if (tag.is_method_type_in_error()) { 2203 result = JVM_CONSTANT_MethodType; 2204 } else if (tag.is_method_handle_in_error()) { 2205 result = JVM_CONSTANT_MethodHandle; 2206 } else if (tag.is_dynamic_constant_in_error()) { 2207 result = JVM_CONSTANT_Dynamic; 2208 } 2209 return result; 2210 } 2211 JVM_END 2212 2213 // Assertion support. ////////////////////////////////////////////////////////// 2214 2215 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2216 JVMWrapper("JVM_DesiredAssertionStatus"); 2217 assert(cls != NULL, "bad class"); 2218 2219 oop r = JNIHandles::resolve(cls); 2220 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2221 if (java_lang_Class::is_primitive(r)) return false; 2222 2223 Klass* k = java_lang_Class::as_Klass(r); 2224 assert(k->is_instance_klass(), "must be an instance klass"); 2225 if (!k->is_instance_klass()) return false; 2226 2227 ResourceMark rm(THREAD); 2228 const char* name = k->name()->as_C_string(); 2229 bool system_class = k->class_loader() == NULL; 2230 return JavaAssertions::enabled(name, system_class); 2231 2232 JVM_END 2233 2234 2235 // Return a new AssertionStatusDirectives object with the fields filled in with 2236 // command-line assertion arguments (i.e., -ea, -da). 2237 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2238 JVMWrapper("JVM_AssertionStatusDirectives"); 2239 JvmtiVMObjectAllocEventCollector oam; 2240 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2241 return JNIHandles::make_local(env, asd); 2242 JVM_END 2243 2244 // Arrays support ///////////////////////////////////////////////////////////// 2245 2246 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2247 JVMWrapper("JVM_ArrayIsAccessAtomic"); 2248 oop o = JNIHandles::resolve(array); 2249 Klass* k = o->klass(); 2250 if ((o == NULL) || (!k->is_array_klass())) { 2251 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2252 } 2253 if (k->is_valueArray_klass()) { 2254 return ValueArrayKlass::cast(k)->is_atomic(); 2255 } 2256 return true; 2257 JVM_END 2258 2259 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array)) 2260 JVMWrapper("JVM_ArrayEnsureAccessAtomic"); 2261 oop o = JNIHandles::resolve(array); 2262 Klass* k = o->klass(); 2263 if ((o == NULL) || (!k->is_array_klass())) { 2264 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 2265 } 2266 if (k->is_valueArray_klass()) { 2267 ValueArrayKlass* vk = ValueArrayKlass::cast(k); 2268 if (!vk->is_atomic()) { 2269 /** 2270 * Need to decide how to implement: 2271 * 2272 * 1) Change to objArrayOop layout, therefore oop->klass() differs so 2273 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through 2274 * "checkcast" & "instanceof" 2275 * 2276 * 2) Use extra header in the valueArrayOop to flag atomicity required and 2277 * possibly per instance lock structure. Said info, could be placed in 2278 * "trailer" rather than disturb the current arrayOop 2279 */ 2280 Unimplemented(); 2281 } 2282 } 2283 return array; 2284 JVM_END 2285 2286 // Verification //////////////////////////////////////////////////////////////////////////////// 2287 2288 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2289 2290 // RedefineClasses support: bug 6214132 caused verification to fail. 2291 // All functions from this section should call the jvmtiThreadSate function: 2292 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2293 // The function returns a Klass* of the _scratch_class if the verifier 2294 // was invoked in the middle of the class redefinition. 2295 // Otherwise it returns its argument value which is the _the_class Klass*. 2296 // Please, refer to the description in the jvmtiThreadSate.hpp. 2297 2298 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2299 JVMWrapper("JVM_GetClassNameUTF"); 2300 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2301 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2302 return k->name()->as_utf8(); 2303 JVM_END 2304 2305 2306 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2307 JVMWrapper("JVM_GetClassCPTypes"); 2308 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2309 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2310 // types will have length zero if this is not an InstanceKlass 2311 // (length is determined by call to JVM_GetClassCPEntriesCount) 2312 if (k->is_instance_klass()) { 2313 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2314 for (int index = cp->length() - 1; index >= 0; index--) { 2315 constantTag tag = cp->tag_at(index); 2316 types[index] = tag.is_unresolved_klass() ? JVM_CONSTANT_Class : tag.value(); 2317 } 2318 } 2319 JVM_END 2320 2321 2322 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2323 JVMWrapper("JVM_GetClassCPEntriesCount"); 2324 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2325 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2326 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2327 JVM_END 2328 2329 2330 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2331 JVMWrapper("JVM_GetClassFieldsCount"); 2332 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2333 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2334 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2335 JVM_END 2336 2337 2338 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2339 JVMWrapper("JVM_GetClassMethodsCount"); 2340 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2341 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2342 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2343 JVM_END 2344 2345 2346 // The following methods, used for the verifier, are never called with 2347 // array klasses, so a direct cast to InstanceKlass is safe. 2348 // Typically, these methods are called in a loop with bounds determined 2349 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2350 // zero for arrays. 2351 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2352 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2353 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2354 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2355 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2356 int length = method->checked_exceptions_length(); 2357 if (length > 0) { 2358 CheckedExceptionElement* table= method->checked_exceptions_start(); 2359 for (int i = 0; i < length; i++) { 2360 exceptions[i] = table[i].class_cp_index; 2361 } 2362 } 2363 JVM_END 2364 2365 2366 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2367 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2368 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2369 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2370 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2371 return method->checked_exceptions_length(); 2372 JVM_END 2373 2374 2375 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2376 JVMWrapper("JVM_GetMethodIxByteCode"); 2377 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2378 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2379 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2380 memcpy(code, method->code_base(), method->code_size()); 2381 JVM_END 2382 2383 2384 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2385 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2386 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2387 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2388 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2389 return method->code_size(); 2390 JVM_END 2391 2392 2393 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2394 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2395 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2396 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2397 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2398 ExceptionTable extable(method); 2399 entry->start_pc = extable.start_pc(entry_index); 2400 entry->end_pc = extable.end_pc(entry_index); 2401 entry->handler_pc = extable.handler_pc(entry_index); 2402 entry->catchType = extable.catch_type_index(entry_index); 2403 JVM_END 2404 2405 2406 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2407 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2408 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2409 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2410 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2411 return method->exception_table_length(); 2412 JVM_END 2413 2414 2415 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2416 JVMWrapper("JVM_GetMethodIxModifiers"); 2417 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2418 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2419 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2420 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2421 JVM_END 2422 2423 2424 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2425 JVMWrapper("JVM_GetFieldIxModifiers"); 2426 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2427 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2428 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2429 JVM_END 2430 2431 2432 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2433 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2434 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2435 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2436 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2437 return method->max_locals(); 2438 JVM_END 2439 2440 2441 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2442 JVMWrapper("JVM_GetMethodIxArgsSize"); 2443 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2444 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2445 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2446 return method->size_of_parameters(); 2447 JVM_END 2448 2449 2450 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2451 JVMWrapper("JVM_GetMethodIxMaxStack"); 2452 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2453 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2454 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2455 return method->verifier_max_stack(); 2456 JVM_END 2457 2458 2459 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2460 JVMWrapper("JVM_IsConstructorIx"); 2461 ResourceMark rm(THREAD); 2462 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2463 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2464 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2465 return method->is_object_constructor(); 2466 JVM_END 2467 2468 2469 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2470 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2471 ResourceMark rm(THREAD); 2472 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2473 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2474 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2475 return method->is_overpass(); 2476 JVM_END 2477 2478 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2479 JVMWrapper("JVM_GetMethodIxIxUTF"); 2480 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2481 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2482 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2483 return method->name()->as_utf8(); 2484 JVM_END 2485 2486 2487 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2488 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2489 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2490 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2491 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2492 return method->signature()->as_utf8(); 2493 JVM_END 2494 2495 /** 2496 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2497 * read entries in the constant pool. Since the old verifier always 2498 * works on a copy of the code, it will not see any rewriting that 2499 * may possibly occur in the middle of verification. So it is important 2500 * that nothing it calls tries to use the cpCache instead of the raw 2501 * constant pool, so we must use cp->uncached_x methods when appropriate. 2502 */ 2503 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2504 JVMWrapper("JVM_GetCPFieldNameUTF"); 2505 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2506 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2507 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2508 switch (cp->tag_at(cp_index).value()) { 2509 case JVM_CONSTANT_Fieldref: 2510 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2511 default: 2512 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2513 } 2514 ShouldNotReachHere(); 2515 return NULL; 2516 JVM_END 2517 2518 2519 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2520 JVMWrapper("JVM_GetCPMethodNameUTF"); 2521 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2522 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2523 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2524 switch (cp->tag_at(cp_index).value()) { 2525 case JVM_CONSTANT_InterfaceMethodref: 2526 case JVM_CONSTANT_Methodref: 2527 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2528 default: 2529 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2530 } 2531 ShouldNotReachHere(); 2532 return NULL; 2533 JVM_END 2534 2535 2536 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2537 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2538 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2539 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2540 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2541 switch (cp->tag_at(cp_index).value()) { 2542 case JVM_CONSTANT_InterfaceMethodref: 2543 case JVM_CONSTANT_Methodref: 2544 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2545 default: 2546 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2547 } 2548 ShouldNotReachHere(); 2549 return NULL; 2550 JVM_END 2551 2552 2553 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2554 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2555 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2556 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2557 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2558 switch (cp->tag_at(cp_index).value()) { 2559 case JVM_CONSTANT_Fieldref: 2560 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2561 default: 2562 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2563 } 2564 ShouldNotReachHere(); 2565 return NULL; 2566 JVM_END 2567 2568 2569 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2570 JVMWrapper("JVM_GetCPClassNameUTF"); 2571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2572 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2573 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2574 Symbol* classname = cp->klass_name_at(cp_index); 2575 return classname->as_utf8(); 2576 JVM_END 2577 2578 2579 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2580 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2581 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2582 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2583 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2584 switch (cp->tag_at(cp_index).value()) { 2585 case JVM_CONSTANT_Fieldref: { 2586 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2587 Symbol* classname = cp->klass_name_at(class_index); 2588 return classname->as_utf8(); 2589 } 2590 default: 2591 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2592 } 2593 ShouldNotReachHere(); 2594 return NULL; 2595 JVM_END 2596 2597 2598 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2599 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2600 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2601 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2602 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2603 switch (cp->tag_at(cp_index).value()) { 2604 case JVM_CONSTANT_Methodref: 2605 case JVM_CONSTANT_InterfaceMethodref: { 2606 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2607 Symbol* classname = cp->klass_name_at(class_index); 2608 return classname->as_utf8(); 2609 } 2610 default: 2611 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2612 } 2613 ShouldNotReachHere(); 2614 return NULL; 2615 JVM_END 2616 2617 2618 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2619 JVMWrapper("JVM_GetCPFieldModifiers"); 2620 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2621 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2622 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2623 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2624 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2625 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2626 switch (cp->tag_at(cp_index).value()) { 2627 case JVM_CONSTANT_Fieldref: { 2628 Symbol* name = cp->uncached_name_ref_at(cp_index); 2629 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2630 InstanceKlass* ik = InstanceKlass::cast(k_called); 2631 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2632 if (fs.name() == name && fs.signature() == signature) { 2633 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2634 } 2635 } 2636 return -1; 2637 } 2638 default: 2639 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2640 } 2641 ShouldNotReachHere(); 2642 return 0; 2643 JVM_END 2644 2645 2646 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2647 JVMWrapper("JVM_GetCPMethodModifiers"); 2648 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2649 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2650 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2651 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2652 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2653 switch (cp->tag_at(cp_index).value()) { 2654 case JVM_CONSTANT_Methodref: 2655 case JVM_CONSTANT_InterfaceMethodref: { 2656 Symbol* name = cp->uncached_name_ref_at(cp_index); 2657 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2658 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2659 int methods_count = methods->length(); 2660 for (int i = 0; i < methods_count; i++) { 2661 Method* method = methods->at(i); 2662 if (method->name() == name && method->signature() == signature) { 2663 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2664 } 2665 } 2666 return -1; 2667 } 2668 default: 2669 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2670 } 2671 ShouldNotReachHere(); 2672 return 0; 2673 JVM_END 2674 2675 2676 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2677 2678 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2679 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2680 JVM_END 2681 2682 2683 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2684 JVMWrapper("JVM_IsSameClassPackage"); 2685 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2686 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2687 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2688 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2689 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2690 JVM_END 2691 2692 // Printing support ////////////////////////////////////////////////// 2693 extern "C" { 2694 2695 ATTRIBUTE_PRINTF(3, 0) 2696 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2697 // Reject count values that are negative signed values converted to 2698 // unsigned; see bug 4399518, 4417214 2699 if ((intptr_t)count <= 0) return -1; 2700 2701 int result = os::vsnprintf(str, count, fmt, args); 2702 if (result > 0 && (size_t)result >= count) { 2703 result = -1; 2704 } 2705 2706 return result; 2707 } 2708 2709 ATTRIBUTE_PRINTF(3, 4) 2710 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2711 va_list args; 2712 int len; 2713 va_start(args, fmt); 2714 len = jio_vsnprintf(str, count, fmt, args); 2715 va_end(args); 2716 return len; 2717 } 2718 2719 ATTRIBUTE_PRINTF(2, 3) 2720 int jio_fprintf(FILE* f, const char *fmt, ...) { 2721 int len; 2722 va_list args; 2723 va_start(args, fmt); 2724 len = jio_vfprintf(f, fmt, args); 2725 va_end(args); 2726 return len; 2727 } 2728 2729 ATTRIBUTE_PRINTF(2, 0) 2730 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2731 if (Arguments::vfprintf_hook() != NULL) { 2732 return Arguments::vfprintf_hook()(f, fmt, args); 2733 } else { 2734 return vfprintf(f, fmt, args); 2735 } 2736 } 2737 2738 ATTRIBUTE_PRINTF(1, 2) 2739 JNIEXPORT int jio_printf(const char *fmt, ...) { 2740 int len; 2741 va_list args; 2742 va_start(args, fmt); 2743 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2744 va_end(args); 2745 return len; 2746 } 2747 2748 // HotSpot specific jio method 2749 void jio_print(const char* s, size_t len) { 2750 // Try to make this function as atomic as possible. 2751 if (Arguments::vfprintf_hook() != NULL) { 2752 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2753 } else { 2754 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2755 size_t count = ::write(defaultStream::output_fd(), s, (int)len); 2756 } 2757 } 2758 2759 } // Extern C 2760 2761 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2762 2763 // In most of the JVM thread support functions we need to access the 2764 // thread through a ThreadsListHandle to prevent it from exiting and 2765 // being reclaimed while we try to operate on it. The exceptions to this 2766 // rule are when operating on the current thread, or if the monitor of 2767 // the target java.lang.Thread is locked at the Java level - in both 2768 // cases the target cannot exit. 2769 2770 static void thread_entry(JavaThread* thread, TRAPS) { 2771 HandleMark hm(THREAD); 2772 Handle obj(THREAD, thread->threadObj()); 2773 JavaValue result(T_VOID); 2774 JavaCalls::call_virtual(&result, 2775 obj, 2776 SystemDictionary::Thread_klass(), 2777 vmSymbols::run_method_name(), 2778 vmSymbols::void_method_signature(), 2779 THREAD); 2780 } 2781 2782 2783 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2784 JVMWrapper("JVM_StartThread"); 2785 JavaThread *native_thread = NULL; 2786 2787 // We cannot hold the Threads_lock when we throw an exception, 2788 // due to rank ordering issues. Example: we might need to grab the 2789 // Heap_lock while we construct the exception. 2790 bool throw_illegal_thread_state = false; 2791 2792 // We must release the Threads_lock before we can post a jvmti event 2793 // in Thread::start. 2794 { 2795 // Ensure that the C++ Thread and OSThread structures aren't freed before 2796 // we operate. 2797 MutexLocker mu(Threads_lock); 2798 2799 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2800 // re-starting an already started thread, so we should usually find 2801 // that the JavaThread is null. However for a JNI attached thread 2802 // there is a small window between the Thread object being created 2803 // (with its JavaThread set) and the update to its threadStatus, so we 2804 // have to check for this 2805 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2806 throw_illegal_thread_state = true; 2807 } else { 2808 // We could also check the stillborn flag to see if this thread was already stopped, but 2809 // for historical reasons we let the thread detect that itself when it starts running 2810 2811 jlong size = 2812 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2813 // Allocate the C++ Thread structure and create the native thread. The 2814 // stack size retrieved from java is 64-bit signed, but the constructor takes 2815 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2816 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2817 // - Avoid passing negative values which would result in really large stacks. 2818 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2819 size_t sz = size > 0 ? (size_t) size : 0; 2820 native_thread = new JavaThread(&thread_entry, sz); 2821 2822 // At this point it may be possible that no osthread was created for the 2823 // JavaThread due to lack of memory. Check for this situation and throw 2824 // an exception if necessary. Eventually we may want to change this so 2825 // that we only grab the lock if the thread was created successfully - 2826 // then we can also do this check and throw the exception in the 2827 // JavaThread constructor. 2828 if (native_thread->osthread() != NULL) { 2829 // Note: the current thread is not being used within "prepare". 2830 native_thread->prepare(jthread); 2831 } 2832 } 2833 } 2834 2835 if (throw_illegal_thread_state) { 2836 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2837 } 2838 2839 assert(native_thread != NULL, "Starting null thread?"); 2840 2841 if (native_thread->osthread() == NULL) { 2842 // No one should hold a reference to the 'native_thread'. 2843 native_thread->smr_delete(); 2844 if (JvmtiExport::should_post_resource_exhausted()) { 2845 JvmtiExport::post_resource_exhausted( 2846 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2847 os::native_thread_creation_failed_msg()); 2848 } 2849 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2850 os::native_thread_creation_failed_msg()); 2851 } 2852 2853 Thread::start(native_thread); 2854 2855 JVM_END 2856 2857 2858 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2859 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2860 // but is thought to be reliable and simple. In the case, where the receiver is the 2861 // same thread as the sender, no VM_Operation is needed. 2862 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2863 JVMWrapper("JVM_StopThread"); 2864 2865 // A nested ThreadsListHandle will grab the Threads_lock so create 2866 // tlh before we resolve throwable. 2867 ThreadsListHandle tlh(thread); 2868 oop java_throwable = JNIHandles::resolve(throwable); 2869 if (java_throwable == NULL) { 2870 THROW(vmSymbols::java_lang_NullPointerException()); 2871 } 2872 oop java_thread = NULL; 2873 JavaThread* receiver = NULL; 2874 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2875 Events::log_exception(thread, 2876 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2877 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2878 2879 if (is_alive) { 2880 // jthread refers to a live JavaThread. 2881 if (thread == receiver) { 2882 // Exception is getting thrown at self so no VM_Operation needed. 2883 THROW_OOP(java_throwable); 2884 } else { 2885 // Use a VM_Operation to throw the exception. 2886 Thread::send_async_exception(java_thread, java_throwable); 2887 } 2888 } else { 2889 // Either: 2890 // - target thread has not been started before being stopped, or 2891 // - target thread already terminated 2892 // We could read the threadStatus to determine which case it is 2893 // but that is overkill as it doesn't matter. We must set the 2894 // stillborn flag for the first case, and if the thread has already 2895 // exited setting this flag has no effect. 2896 java_lang_Thread::set_stillborn(java_thread); 2897 } 2898 JVM_END 2899 2900 2901 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2902 JVMWrapper("JVM_IsThreadAlive"); 2903 2904 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2905 return java_lang_Thread::is_alive(thread_oop); 2906 JVM_END 2907 2908 2909 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2910 JVMWrapper("JVM_SuspendThread"); 2911 2912 ThreadsListHandle tlh(thread); 2913 JavaThread* receiver = NULL; 2914 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2915 if (is_alive) { 2916 // jthread refers to a live JavaThread. 2917 { 2918 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2919 if (receiver->is_external_suspend()) { 2920 // Don't allow nested external suspend requests. We can't return 2921 // an error from this interface so just ignore the problem. 2922 return; 2923 } 2924 if (receiver->is_exiting()) { // thread is in the process of exiting 2925 return; 2926 } 2927 receiver->set_external_suspend(); 2928 } 2929 2930 // java_suspend() will catch threads in the process of exiting 2931 // and will ignore them. 2932 receiver->java_suspend(); 2933 2934 // It would be nice to have the following assertion in all the 2935 // time, but it is possible for a racing resume request to have 2936 // resumed this thread right after we suspended it. Temporarily 2937 // enable this assertion if you are chasing a different kind of 2938 // bug. 2939 // 2940 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2941 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2942 } 2943 JVM_END 2944 2945 2946 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2947 JVMWrapper("JVM_ResumeThread"); 2948 2949 ThreadsListHandle tlh(thread); 2950 JavaThread* receiver = NULL; 2951 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2952 if (is_alive) { 2953 // jthread refers to a live JavaThread. 2954 2955 // This is the original comment for this Threads_lock grab: 2956 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2957 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2958 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2959 // looks at it. 2960 // 2961 // The above comment dates back to when we had both internal and 2962 // external suspend APIs that shared a common underlying mechanism. 2963 // External suspend is now entirely cooperative and doesn't share 2964 // anything with internal suspend. That said, there are some 2965 // assumptions in the VM that an external resume grabs the 2966 // Threads_lock. We can't drop the Threads_lock grab here until we 2967 // resolve the assumptions that exist elsewhere. 2968 // 2969 MutexLocker ml(Threads_lock); 2970 receiver->java_resume(); 2971 } 2972 JVM_END 2973 2974 2975 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2976 JVMWrapper("JVM_SetThreadPriority"); 2977 2978 ThreadsListHandle tlh(thread); 2979 oop java_thread = NULL; 2980 JavaThread* receiver = NULL; 2981 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2982 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2983 2984 if (is_alive) { 2985 // jthread refers to a live JavaThread. 2986 Thread::set_priority(receiver, (ThreadPriority)prio); 2987 } 2988 // Implied else: If the JavaThread hasn't started yet, then the 2989 // priority set in the java.lang.Thread object above will be pushed 2990 // down when it does start. 2991 JVM_END 2992 2993 2994 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2995 JVMWrapper("JVM_Yield"); 2996 if (os::dont_yield()) return; 2997 HOTSPOT_THREAD_YIELD(); 2998 os::naked_yield(); 2999 JVM_END 3000 3001 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) { 3002 assert(event != NULL, "invariant"); 3003 assert(event->should_commit(), "invariant"); 3004 event->set_time(millis); 3005 event->commit(); 3006 } 3007 3008 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3009 JVMWrapper("JVM_Sleep"); 3010 3011 if (millis < 0) { 3012 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3013 } 3014 3015 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 3016 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3017 } 3018 3019 // Save current thread state and restore it at the end of this block. 3020 // And set new thread state to SLEEPING. 3021 JavaThreadSleepState jtss(thread); 3022 3023 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3024 EventThreadSleep event; 3025 3026 if (millis == 0) { 3027 os::naked_yield(); 3028 } else { 3029 ThreadState old_state = thread->osthread()->get_state(); 3030 thread->osthread()->set_state(SLEEPING); 3031 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3032 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3033 // us while we were sleeping. We do not overwrite those. 3034 if (!HAS_PENDING_EXCEPTION) { 3035 if (event.should_commit()) { 3036 post_thread_sleep_event(&event, millis); 3037 } 3038 HOTSPOT_THREAD_SLEEP_END(1); 3039 3040 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3041 // to properly restore the thread state. That's likely wrong. 3042 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3043 } 3044 } 3045 thread->osthread()->set_state(old_state); 3046 } 3047 if (event.should_commit()) { 3048 post_thread_sleep_event(&event, millis); 3049 } 3050 HOTSPOT_THREAD_SLEEP_END(0); 3051 JVM_END 3052 3053 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3054 JVMWrapper("JVM_CurrentThread"); 3055 oop jthread = thread->threadObj(); 3056 assert (thread != NULL, "no current thread!"); 3057 return JNIHandles::make_local(env, jthread); 3058 JVM_END 3059 3060 class CountStackFramesTC : public ThreadClosure { 3061 int _count; 3062 bool _suspended; 3063 public: 3064 CountStackFramesTC() : _count(0), _suspended(false) {} 3065 virtual void do_thread(Thread* thread) { 3066 JavaThread* jt = (JavaThread*)thread; 3067 if (!jt->is_external_suspend()) { 3068 // To keep same behavior we fail this operation, 3069 // even if it would work perfectly. 3070 return; 3071 } 3072 _suspended = true; 3073 // Count all java activation, i.e., number of vframes. 3074 for (vframeStream vfst(jt); !vfst.at_end(); vfst.next()) { 3075 // Native frames are not counted. 3076 if (!vfst.method()->is_native()) _count++; 3077 } 3078 } 3079 int count() { return _count; } 3080 int suspended() { return _suspended; } 3081 }; 3082 3083 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3084 JVMWrapper("JVM_CountStackFrames"); 3085 3086 ThreadsListHandle tlh(thread); 3087 JavaThread* receiver = NULL; 3088 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3089 if (is_alive) { 3090 // jthread refers to a live JavaThread. 3091 CountStackFramesTC csf; 3092 Handshake::execute(&csf, receiver); 3093 if (!csf.suspended()) { 3094 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3095 "this thread is not suspended"); 3096 } 3097 return csf.count(); 3098 } 3099 // Implied else: if JavaThread is not alive simply return a count of 0. 3100 return 0; 3101 JVM_END 3102 3103 3104 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3105 JVMWrapper("JVM_Interrupt"); 3106 3107 ThreadsListHandle tlh(thread); 3108 JavaThread* receiver = NULL; 3109 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3110 if (is_alive) { 3111 // jthread refers to a live JavaThread. 3112 Thread::interrupt(receiver); 3113 } 3114 JVM_END 3115 3116 3117 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3118 JVMWrapper("JVM_IsInterrupted"); 3119 3120 ThreadsListHandle tlh(thread); 3121 JavaThread* receiver = NULL; 3122 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3123 if (is_alive) { 3124 // jthread refers to a live JavaThread. 3125 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0); 3126 } else { 3127 return JNI_FALSE; 3128 } 3129 JVM_END 3130 3131 3132 // Return true iff the current thread has locked the object passed in 3133 3134 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3135 JVMWrapper("JVM_HoldsLock"); 3136 assert(THREAD->is_Java_thread(), "sanity check"); 3137 if (obj == NULL) { 3138 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3139 } 3140 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3141 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3142 JVM_END 3143 3144 3145 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3146 JVMWrapper("JVM_DumpAllStacks"); 3147 VM_PrintThreads op; 3148 VMThread::execute(&op); 3149 if (JvmtiExport::should_post_data_dump()) { 3150 JvmtiExport::post_data_dump(); 3151 } 3152 JVM_END 3153 3154 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3155 JVMWrapper("JVM_SetNativeThreadName"); 3156 3157 // We don't use a ThreadsListHandle here because the current thread 3158 // must be alive. 3159 oop java_thread = JNIHandles::resolve_non_null(jthread); 3160 JavaThread* thr = java_lang_Thread::thread(java_thread); 3161 if (thread == thr && !thr->has_attached_via_jni()) { 3162 // Thread naming is only supported for the current thread and 3163 // we don't set the name of an attached thread to avoid stepping 3164 // on other programs. 3165 ResourceMark rm(thread); 3166 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3167 os::set_native_thread_name(thread_name); 3168 } 3169 JVM_END 3170 3171 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3172 3173 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3174 JVMWrapper("JVM_GetClassContext"); 3175 ResourceMark rm(THREAD); 3176 JvmtiVMObjectAllocEventCollector oam; 3177 vframeStream vfst(thread); 3178 3179 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3180 // This must only be called from SecurityManager.getClassContext 3181 Method* m = vfst.method(); 3182 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3183 m->name() == vmSymbols::getClassContext_name() && 3184 m->signature() == vmSymbols::void_class_array_signature())) { 3185 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3186 } 3187 } 3188 3189 // Collect method holders 3190 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3191 for (; !vfst.at_end(); vfst.security_next()) { 3192 Method* m = vfst.method(); 3193 // Native frames are not returned 3194 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3195 Klass* holder = m->method_holder(); 3196 assert(holder->is_klass(), "just checking"); 3197 klass_array->append(holder); 3198 } 3199 } 3200 3201 // Create result array of type [Ljava/lang/Class; 3202 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3203 // Fill in mirrors corresponding to method holders 3204 for (int i = 0; i < klass_array->length(); i++) { 3205 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3206 } 3207 3208 return (jobjectArray) JNIHandles::make_local(env, result); 3209 JVM_END 3210 3211 3212 // java.lang.Package //////////////////////////////////////////////////////////////// 3213 3214 3215 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3216 JVMWrapper("JVM_GetSystemPackage"); 3217 ResourceMark rm(THREAD); 3218 JvmtiVMObjectAllocEventCollector oam; 3219 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3220 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3221 return (jstring) JNIHandles::make_local(result); 3222 JVM_END 3223 3224 3225 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3226 JVMWrapper("JVM_GetSystemPackages"); 3227 JvmtiVMObjectAllocEventCollector oam; 3228 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3229 return (jobjectArray) JNIHandles::make_local(result); 3230 JVM_END 3231 3232 3233 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3234 3235 3236 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3237 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3238 3239 MonitorLocker ml(Heap_lock); 3240 oop ref = Universe::reference_pending_list(); 3241 if (ref != NULL) { 3242 Universe::set_reference_pending_list(NULL); 3243 } 3244 return JNIHandles::make_local(env, ref); 3245 JVM_END 3246 3247 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3248 JVMWrapper("JVM_HasReferencePendingList"); 3249 MonitorLocker ml(Heap_lock); 3250 return Universe::has_reference_pending_list(); 3251 JVM_END 3252 3253 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3254 JVMWrapper("JVM_WaitForReferencePendingList"); 3255 MonitorLocker ml(Heap_lock); 3256 while (!Universe::has_reference_pending_list()) { 3257 ml.wait(); 3258 } 3259 JVM_END 3260 3261 3262 // ObjectInputStream /////////////////////////////////////////////////////////////// 3263 3264 // Return the first user-defined class loader up the execution stack, or null 3265 // if only code from the bootstrap or platform class loader is on the stack. 3266 3267 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3268 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3269 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3270 oop loader = vfst.method()->method_holder()->class_loader(); 3271 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3272 return JNIHandles::make_local(env, loader); 3273 } 3274 } 3275 return NULL; 3276 JVM_END 3277 3278 3279 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3280 3281 3282 // resolve array handle and check arguments 3283 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3284 if (arr == NULL) { 3285 THROW_0(vmSymbols::java_lang_NullPointerException()); 3286 } 3287 oop a = JNIHandles::resolve_non_null(arr); 3288 if (!a->is_array()) { 3289 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3290 } else if (type_array_only && !a->is_typeArray()) { 3291 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3292 } 3293 return arrayOop(a); 3294 } 3295 3296 3297 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3298 JVMWrapper("JVM_GetArrayLength"); 3299 arrayOop a = check_array(env, arr, false, CHECK_0); 3300 return a->length(); 3301 JVM_END 3302 3303 3304 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3305 JVMWrapper("JVM_Array_Get"); 3306 JvmtiVMObjectAllocEventCollector oam; 3307 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3308 jvalue value; 3309 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3310 oop box = Reflection::box(&value, type, CHECK_NULL); 3311 return JNIHandles::make_local(env, box); 3312 JVM_END 3313 3314 3315 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3316 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3317 jvalue value; 3318 value.i = 0; // to initialize value before getting used in CHECK 3319 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3320 assert(a->is_typeArray(), "just checking"); 3321 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3322 BasicType wide_type = (BasicType) wCode; 3323 if (type != wide_type) { 3324 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3325 } 3326 return value; 3327 JVM_END 3328 3329 3330 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3331 JVMWrapper("JVM_SetArrayElement"); 3332 arrayOop a = check_array(env, arr, false, CHECK); 3333 oop box = JNIHandles::resolve(val); 3334 jvalue value; 3335 value.i = 0; // to initialize value before getting used in CHECK 3336 BasicType value_type; 3337 if (a->is_objArray()) { 3338 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3339 value_type = Reflection::unbox_for_regular_object(box, &value); 3340 } else { 3341 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3342 } 3343 Reflection::array_set(&value, a, index, value_type, CHECK); 3344 JVM_END 3345 3346 3347 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3348 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3349 arrayOop a = check_array(env, arr, true, CHECK); 3350 assert(a->is_typeArray(), "just checking"); 3351 BasicType value_type = (BasicType) vCode; 3352 Reflection::array_set(&v, a, index, value_type, CHECK); 3353 JVM_END 3354 3355 3356 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3357 JVMWrapper("JVM_NewArray"); 3358 JvmtiVMObjectAllocEventCollector oam; 3359 oop element_mirror = JNIHandles::resolve(eltClass); 3360 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3361 return JNIHandles::make_local(env, result); 3362 JVM_END 3363 3364 3365 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3366 JVMWrapper("JVM_NewMultiArray"); 3367 JvmtiVMObjectAllocEventCollector oam; 3368 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3369 oop element_mirror = JNIHandles::resolve(eltClass); 3370 assert(dim_array->is_typeArray(), "just checking"); 3371 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3372 return JNIHandles::make_local(env, result); 3373 JVM_END 3374 3375 3376 // Library support /////////////////////////////////////////////////////////////////////////// 3377 3378 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3379 //%note jvm_ct 3380 JVMWrapper("JVM_LoadLibrary"); 3381 char ebuf[1024]; 3382 void *load_result; 3383 { 3384 ThreadToNativeFromVM ttnfvm(thread); 3385 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3386 } 3387 if (load_result == NULL) { 3388 char msg[1024]; 3389 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3390 // Since 'ebuf' may contain a string encoded using 3391 // platform encoding scheme, we need to pass 3392 // Exceptions::unsafe_to_utf8 to the new_exception method 3393 // as the last argument. See bug 6367357. 3394 Handle h_exception = 3395 Exceptions::new_exception(thread, 3396 vmSymbols::java_lang_UnsatisfiedLinkError(), 3397 msg, Exceptions::unsafe_to_utf8); 3398 3399 THROW_HANDLE_0(h_exception); 3400 } 3401 return load_result; 3402 JVM_END 3403 3404 3405 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3406 JVMWrapper("JVM_UnloadLibrary"); 3407 os::dll_unload(handle); 3408 JVM_END 3409 3410 3411 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3412 JVMWrapper("JVM_FindLibraryEntry"); 3413 return os::dll_lookup(handle, name); 3414 JVM_END 3415 3416 3417 // JNI version /////////////////////////////////////////////////////////////////////////////// 3418 3419 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3420 JVMWrapper("JVM_IsSupportedJNIVersion"); 3421 return Threads::is_supported_jni_version_including_1_1(version); 3422 JVM_END 3423 3424 3425 // String support /////////////////////////////////////////////////////////////////////////// 3426 3427 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3428 JVMWrapper("JVM_InternString"); 3429 JvmtiVMObjectAllocEventCollector oam; 3430 if (str == NULL) return NULL; 3431 oop string = JNIHandles::resolve_non_null(str); 3432 oop result = StringTable::intern(string, CHECK_NULL); 3433 return (jstring) JNIHandles::make_local(env, result); 3434 JVM_END 3435 3436 3437 // Raw monitor support ////////////////////////////////////////////////////////////////////// 3438 3439 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3440 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3441 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3442 // that only works with java threads. 3443 3444 3445 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3446 VM_Exit::block_if_vm_exited(); 3447 JVMWrapper("JVM_RawMonitorCreate"); 3448 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3449 } 3450 3451 3452 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3453 VM_Exit::block_if_vm_exited(); 3454 JVMWrapper("JVM_RawMonitorDestroy"); 3455 delete ((Mutex*) mon); 3456 } 3457 3458 3459 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3460 VM_Exit::block_if_vm_exited(); 3461 JVMWrapper("JVM_RawMonitorEnter"); 3462 ((Mutex*) mon)->jvm_raw_lock(); 3463 return 0; 3464 } 3465 3466 3467 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3468 VM_Exit::block_if_vm_exited(); 3469 JVMWrapper("JVM_RawMonitorExit"); 3470 ((Mutex*) mon)->jvm_raw_unlock(); 3471 } 3472 3473 3474 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3475 3476 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3477 Handle loader, Handle protection_domain, 3478 jboolean throwError, TRAPS) { 3479 // Security Note: 3480 // The Java level wrapper will perform the necessary security check allowing 3481 // us to pass the NULL as the initiating class loader. The VM is responsible for 3482 // the checkPackageAccess relative to the initiating class loader via the 3483 // protection_domain. The protection_domain is passed as NULL by the java code 3484 // if there is no security manager in 3-arg Class.forName(). 3485 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3486 3487 // Check if we should initialize the class 3488 if (init && klass->is_instance_klass()) { 3489 klass->initialize(CHECK_NULL); 3490 } 3491 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3492 } 3493 3494 3495 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3496 3497 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3498 JVMWrapper("JVM_InvokeMethod"); 3499 Handle method_handle; 3500 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3501 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3502 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3503 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL); 3504 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3505 jobject res = JNIHandles::make_local(env, result); 3506 if (JvmtiExport::should_post_vm_object_alloc()) { 3507 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3508 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3509 if (java_lang_Class::is_primitive(ret_type)) { 3510 // Only for primitive type vm allocates memory for java object. 3511 // See box() method. 3512 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3513 } 3514 } 3515 return res; 3516 } else { 3517 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3518 } 3519 JVM_END 3520 3521 3522 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3523 JVMWrapper("JVM_NewInstanceFromConstructor"); 3524 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL); 3525 oop constructor_mirror = JNIHandles::resolve(c); 3526 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3527 jobject res = JNIHandles::make_local(env, result); 3528 if (JvmtiExport::should_post_vm_object_alloc()) { 3529 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3530 } 3531 return res; 3532 JVM_END 3533 3534 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3535 3536 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3537 JVMWrapper("JVM_SupportsCX8"); 3538 return VM_Version::supports_cx8(); 3539 JVM_END 3540 3541 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3542 JVMWrapper("JVM_InitializeFromArchive"); 3543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3544 assert(k->is_klass(), "just checking"); 3545 HeapShared::initialize_from_archived_subgraph(k); 3546 JVM_END 3547 3548 // Returns an array of all live Thread objects (VM internal JavaThreads, 3549 // jvmti agent threads, and JNI attaching threads are skipped) 3550 // See CR 6404306 regarding JNI attaching threads 3551 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3552 ResourceMark rm(THREAD); 3553 ThreadsListEnumerator tle(THREAD, false, false); 3554 JvmtiVMObjectAllocEventCollector oam; 3555 3556 int num_threads = tle.num_threads(); 3557 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3558 objArrayHandle threads_ah(THREAD, r); 3559 3560 for (int i = 0; i < num_threads; i++) { 3561 Handle h = tle.get_threadObj(i); 3562 threads_ah->obj_at_put(i, h()); 3563 } 3564 3565 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3566 JVM_END 3567 3568 3569 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3570 // Return StackTraceElement[][], each element is the stack trace of a thread in 3571 // the corresponding entry in the given threads array 3572 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3573 JVMWrapper("JVM_DumpThreads"); 3574 JvmtiVMObjectAllocEventCollector oam; 3575 3576 // Check if threads is null 3577 if (threads == NULL) { 3578 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3579 } 3580 3581 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3582 objArrayHandle ah(THREAD, a); 3583 int num_threads = ah->length(); 3584 // check if threads is non-empty array 3585 if (num_threads == 0) { 3586 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3587 } 3588 3589 // check if threads is not an array of objects of Thread class 3590 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3591 if (k != SystemDictionary::Thread_klass()) { 3592 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3593 } 3594 3595 ResourceMark rm(THREAD); 3596 3597 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3598 for (int i = 0; i < num_threads; i++) { 3599 oop thread_obj = ah->obj_at(i); 3600 instanceHandle h(THREAD, (instanceOop) thread_obj); 3601 thread_handle_array->append(h); 3602 } 3603 3604 // The JavaThread references in thread_handle_array are validated 3605 // in VM_ThreadDump::doit(). 3606 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3607 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3608 3609 JVM_END 3610 3611 // JVM monitoring and management support 3612 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3613 return Management::get_jmm_interface(version); 3614 JVM_END 3615 3616 // com.sun.tools.attach.VirtualMachine agent properties support 3617 // 3618 // Initialize the agent properties with the properties maintained in the VM 3619 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3620 JVMWrapper("JVM_InitAgentProperties"); 3621 ResourceMark rm; 3622 3623 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3624 3625 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3626 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3627 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3628 return properties; 3629 JVM_END 3630 3631 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3632 { 3633 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3634 JvmtiVMObjectAllocEventCollector oam; 3635 3636 if (ofClass == NULL) { 3637 return NULL; 3638 } 3639 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3640 // Special handling for primitive objects 3641 if (java_lang_Class::is_primitive(mirror())) { 3642 return NULL; 3643 } 3644 Klass* k = java_lang_Class::as_Klass(mirror()); 3645 if (!k->is_instance_klass()) { 3646 return NULL; 3647 } 3648 InstanceKlass* ik = InstanceKlass::cast(k); 3649 int encl_method_class_idx = ik->enclosing_method_class_index(); 3650 if (encl_method_class_idx == 0) { 3651 return NULL; 3652 } 3653 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3654 objArrayHandle dest(THREAD, dest_o); 3655 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3656 dest->obj_at_put(0, enc_k->java_mirror()); 3657 int encl_method_method_idx = ik->enclosing_method_method_index(); 3658 if (encl_method_method_idx != 0) { 3659 Symbol* sym = ik->constants()->symbol_at( 3660 extract_low_short_from_int( 3661 ik->constants()->name_and_type_at(encl_method_method_idx))); 3662 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3663 dest->obj_at_put(1, str()); 3664 sym = ik->constants()->symbol_at( 3665 extract_high_short_from_int( 3666 ik->constants()->name_and_type_at(encl_method_method_idx))); 3667 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3668 dest->obj_at_put(2, str()); 3669 } 3670 return (jobjectArray) JNIHandles::make_local(dest()); 3671 } 3672 JVM_END 3673 3674 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3675 { 3676 memset(info, 0, info_size); 3677 3678 info->jvm_version = VM_Version::jvm_version(); 3679 info->patch_version = VM_Version::vm_patch_version(); 3680 3681 // when we add a new capability in the jvm_version_info struct, we should also 3682 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3683 // counter defined in runtimeService.cpp. 3684 info->is_attach_supported = AttachListener::is_attach_supported(); 3685 } 3686 JVM_END 3687 3688 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3689 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3690 ResourceMark rm(THREAD); 3691 3692 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3693 return NULL; 3694 } 3695 3696 char** vm_flags = Arguments::jvm_flags_array(); 3697 char** vm_args = Arguments::jvm_args_array(); 3698 int num_flags = Arguments::num_jvm_flags(); 3699 int num_args = Arguments::num_jvm_args(); 3700 3701 InstanceKlass* ik = SystemDictionary::String_klass(); 3702 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3703 objArrayHandle result_h(THREAD, r); 3704 3705 int index = 0; 3706 for (int j = 0; j < num_flags; j++, index++) { 3707 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3708 result_h->obj_at_put(index, h()); 3709 } 3710 for (int i = 0; i < num_args; i++, index++) { 3711 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3712 result_h->obj_at_put(index, h()); 3713 } 3714 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3715 JVM_END 3716 3717 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3718 return os::get_signal_number(name); 3719 JVM_END