1 /* 2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "classfile/classFileStream.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/javaAssertions.hpp" 31 #include "classfile/javaClasses.inline.hpp" 32 #include "classfile/moduleEntry.hpp" 33 #include "classfile/modules.hpp" 34 #include "classfile/packageEntry.hpp" 35 #include "classfile/stringTable.hpp" 36 #include "classfile/symbolTable.hpp" 37 #include "classfile/systemDictionary.hpp" 38 #include "classfile/vmSymbols.hpp" 39 #include "gc/shared/collectedHeap.inline.hpp" 40 #include "interpreter/bytecode.hpp" 41 #include "interpreter/bytecodeUtils.hpp" 42 #include "jfr/jfrEvents.hpp" 43 #include "logging/log.hpp" 44 #include "memory/heapShared.hpp" 45 #include "memory/oopFactory.hpp" 46 #include "memory/referenceType.hpp" 47 #include "memory/resourceArea.hpp" 48 #include "memory/universe.hpp" 49 #include "oops/access.inline.hpp" 50 #include "oops/constantPool.hpp" 51 #include "oops/fieldStreams.hpp" 52 #include "oops/instanceKlass.hpp" 53 #include "oops/method.hpp" 54 #include "oops/objArrayKlass.hpp" 55 #include "oops/objArrayOop.inline.hpp" 56 #include "oops/oop.inline.hpp" 57 #include "prims/jvm_misc.hpp" 58 #include "prims/jvmtiExport.hpp" 59 #include "prims/jvmtiThreadState.hpp" 60 #include "prims/nativeLookup.hpp" 61 #include "prims/stackwalk.hpp" 62 #include "runtime/arguments.hpp" 63 #include "runtime/atomic.hpp" 64 #include "runtime/handles.inline.hpp" 65 #include "runtime/init.hpp" 66 #include "runtime/interfaceSupport.inline.hpp" 67 #include "runtime/deoptimization.hpp" 68 #include "runtime/handshake.hpp" 69 #include "runtime/java.hpp" 70 #include "runtime/javaCalls.hpp" 71 #include "runtime/jfieldIDWorkaround.hpp" 72 #include "runtime/jniHandles.inline.hpp" 73 #include "runtime/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 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 536 JVMWrapper("JVM_FillInStackTrace"); 537 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 538 java_lang_Throwable::fill_in_stack_trace(exception); 539 JVM_END 540 541 // java.lang.NullPointerException /////////////////////////////////////////// 542 543 // Replaces the following well-known class names: 544 // java.lang.Object -> Object 545 // java.lang.String -> String 546 static void trim_well_known_class_names(char *message) { 547 size_t len = strlen(message); 548 size_t skip_len = strlen("java.lang."); 549 size_t min_pattern_len = strlen("java.lang.String"); 550 if (len < min_pattern_len) return; 551 552 for (size_t isrc = 0, idst = 0; isrc <= len; isrc++, idst++) { 553 if (strncmp(message + isrc, "java.lang.Object", min_pattern_len) == 0 || 554 strncmp(message + isrc, "java.lang.String", min_pattern_len) == 0 ) { 555 isrc += skip_len; 556 } 557 if (idst != isrc) { 558 message[idst] = message[isrc]; 559 } 560 } 561 } 562 563 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 564 if (!ShowCodeDetailsInExceptionMessages) return NULL; 565 566 oop exc = JNIHandles::resolve_non_null(throwable); 567 568 Method* method; 569 int bci; 570 if (!java_lang_Throwable::get_method_and_bci(exc, &method, &bci)) { 571 return NULL; 572 } 573 if (method->is_native()) { 574 return NULL; 575 } 576 577 ResourceMark rm(THREAD); 578 stringStream ss; 579 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 580 if (ok) { 581 char *result_string = ss.as_string(); 582 trim_well_known_class_names(result_string); 583 oop result = java_lang_String::create_oop_from_str(result_string, CHECK_0); 584 return (jstring) JNIHandles::make_local(env, result); 585 } else { 586 return NULL; 587 } 588 JVM_END 589 590 // java.lang.StackTraceElement ////////////////////////////////////////////// 591 592 593 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 594 JVMWrapper("JVM_InitStackTraceElementArray"); 595 Handle exception(THREAD, JNIHandles::resolve(throwable)); 596 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 597 objArrayHandle stack_trace(THREAD, st); 598 // Fill in the allocated stack trace 599 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 600 JVM_END 601 602 603 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 604 JVMWrapper("JVM_InitStackTraceElement"); 605 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 606 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 607 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 608 JVM_END 609 610 611 // java.lang.StackWalker ////////////////////////////////////////////////////// 612 613 614 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 615 jint skip_frames, jint frame_count, jint start_index, 616 jobjectArray frames)) 617 JVMWrapper("JVM_CallStackWalk"); 618 JavaThread* jt = (JavaThread*) THREAD; 619 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 620 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 621 } 622 623 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 624 625 // frames array is a Class<?>[] array when only getting caller reference, 626 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 627 // be null. 628 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 629 objArrayHandle frames_array_h(THREAD, fa); 630 631 int limit = start_index + frame_count; 632 if (frames_array_h->length() < limit) { 633 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 634 } 635 636 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 637 start_index, frames_array_h, CHECK_NULL); 638 return JNIHandles::make_local(env, result); 639 JVM_END 640 641 642 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 643 jint frame_count, jint start_index, 644 jobjectArray frames)) 645 JVMWrapper("JVM_MoreStackWalk"); 646 JavaThread* jt = (JavaThread*) THREAD; 647 648 // frames array is a Class<?>[] array when only getting caller reference, 649 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 650 // be null. 651 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 652 objArrayHandle frames_array_h(THREAD, fa); 653 654 int limit = start_index+frame_count; 655 if (frames_array_h->length() < limit) { 656 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 657 } 658 659 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 660 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 661 start_index, frames_array_h, THREAD); 662 JVM_END 663 664 // java.lang.Object /////////////////////////////////////////////// 665 666 667 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 668 JVMWrapper("JVM_IHashCode"); 669 // as implemented in the classic virtual machine; return 0 if object is NULL 670 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 671 JVM_END 672 673 674 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 675 JVMWrapper("JVM_MonitorWait"); 676 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 677 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 678 if (JvmtiExport::should_post_monitor_wait()) { 679 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 680 681 // The current thread already owns the monitor and it has not yet 682 // been added to the wait queue so the current thread cannot be 683 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 684 // event handler cannot accidentally consume an unpark() meant for 685 // the ParkEvent associated with this ObjectMonitor. 686 } 687 ObjectSynchronizer::wait(obj, ms, CHECK); 688 JVM_END 689 690 691 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 692 JVMWrapper("JVM_MonitorNotify"); 693 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 694 ObjectSynchronizer::notify(obj, CHECK); 695 JVM_END 696 697 698 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 699 JVMWrapper("JVM_MonitorNotifyAll"); 700 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 701 ObjectSynchronizer::notifyall(obj, CHECK); 702 JVM_END 703 704 705 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 706 JVMWrapper("JVM_Clone"); 707 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 708 Klass* klass = obj->klass(); 709 JvmtiVMObjectAllocEventCollector oam; 710 711 #ifdef ASSERT 712 // Just checking that the cloneable flag is set correct 713 if (obj->is_array()) { 714 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 715 } else { 716 guarantee(obj->is_instance(), "should be instanceOop"); 717 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 718 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 719 } 720 #endif 721 722 // Check if class of obj supports the Cloneable interface. 723 // All arrays are considered to be cloneable (See JLS 20.1.5). 724 // All j.l.r.Reference classes are considered non-cloneable. 725 if (!klass->is_cloneable() || 726 (klass->is_instance_klass() && 727 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 728 ResourceMark rm(THREAD); 729 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 730 } 731 732 // Make shallow object copy 733 const int size = obj->size(); 734 oop new_obj_oop = NULL; 735 if (obj->is_array()) { 736 const int length = ((arrayOop)obj())->length(); 737 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 738 /* do_zero */ true, CHECK_NULL); 739 } else { 740 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 741 } 742 743 HeapAccess<>::clone(obj(), new_obj_oop, size); 744 745 Handle new_obj(THREAD, new_obj_oop); 746 // Caution: this involves a java upcall, so the clone should be 747 // "gc-robust" by this stage. 748 if (klass->has_finalizer()) { 749 assert(obj->is_instance(), "should be instanceOop"); 750 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 751 new_obj = Handle(THREAD, new_obj_oop); 752 } 753 754 return JNIHandles::make_local(env, new_obj()); 755 JVM_END 756 757 // java.io.File /////////////////////////////////////////////////////////////// 758 759 JVM_LEAF(char*, JVM_NativePath(char* path)) 760 JVMWrapper("JVM_NativePath"); 761 return os::native_path(path); 762 JVM_END 763 764 765 // Misc. class handling /////////////////////////////////////////////////////////// 766 767 768 JVM_ENTRY(void, JVM_LinkClass(JNIEnv* env, jclass classClass, jclass arg)) 769 JVMWrapper("JVM_LinkClass"); 770 771 oop r = JNIHandles::resolve(arg); 772 Klass* klass = java_lang_Class::as_Klass(r); 773 774 if (!ClassForNameDeferLinking && klass->is_instance_klass()) { 775 InstanceKlass::cast(klass)->link_class(CHECK); 776 } 777 JVM_END 778 779 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 780 JVMWrapper("JVM_GetCallerClass"); 781 782 // Getting the class of the caller frame. 783 // 784 // The call stack at this point looks something like this: 785 // 786 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 787 // [1] [ @CallerSensitive API.method ] 788 // [.] [ (skipped intermediate frames) ] 789 // [n] [ caller ] 790 vframeStream vfst(thread); 791 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 792 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 793 Method* m = vfst.method(); 794 assert(m != NULL, "sanity"); 795 switch (n) { 796 case 0: 797 // This must only be called from Reflection.getCallerClass 798 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 799 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 800 } 801 // fall-through 802 case 1: 803 // Frame 0 and 1 must be caller sensitive. 804 if (!m->caller_sensitive()) { 805 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 806 } 807 break; 808 default: 809 if (!m->is_ignored_by_security_stack_walk()) { 810 // We have reached the desired frame; return the holder class. 811 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 812 } 813 break; 814 } 815 } 816 return NULL; 817 JVM_END 818 819 820 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 821 JVMWrapper("JVM_FindPrimitiveClass"); 822 oop mirror = NULL; 823 BasicType t = name2type(utf); 824 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 825 mirror = Universe::java_mirror(t); 826 } 827 if (mirror == NULL) { 828 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 829 } else { 830 return (jclass) JNIHandles::make_local(env, mirror); 831 } 832 JVM_END 833 834 835 // Returns a class loaded by the bootstrap class loader; or null 836 // if not found. ClassNotFoundException is not thrown. 837 // FindClassFromBootLoader is exported to the launcher for windows. 838 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 839 const char* name)) 840 JVMWrapper("JVM_FindClassFromBootLoader"); 841 842 // Java libraries should ensure that name is never null... 843 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 844 // It's impossible to create this class; the name cannot fit 845 // into the constant pool. 846 return NULL; 847 } 848 849 TempNewSymbol h_name = SymbolTable::new_symbol(name); 850 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 851 if (k == NULL) { 852 return NULL; 853 } 854 855 if (log_is_enabled(Debug, class, resolve)) { 856 trace_class_resolution(k); 857 } 858 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 859 JVM_END 860 861 // Find a class with this name in this loader, using the caller's protection domain. 862 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 863 jboolean init, jobject loader, 864 jclass caller)) 865 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 866 // Java libraries should ensure that name is never null... 867 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 868 // It's impossible to create this class; the name cannot fit 869 // into the constant pool. 870 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 871 } 872 873 TempNewSymbol h_name = SymbolTable::new_symbol(name); 874 875 oop loader_oop = JNIHandles::resolve(loader); 876 oop from_class = JNIHandles::resolve(caller); 877 oop protection_domain = NULL; 878 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 879 // NPE. Put it in another way, the bootstrap class loader has all permission and 880 // thus no checkPackageAccess equivalence in the VM class loader. 881 // The caller is also passed as NULL by the java code if there is no security 882 // manager to avoid the performance cost of getting the calling class. 883 if (from_class != NULL && loader_oop != NULL) { 884 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 885 } 886 887 Handle h_loader(THREAD, loader_oop); 888 Handle h_prot(THREAD, protection_domain); 889 890 jboolean link = !ClassForNameDeferLinking; 891 jclass result = find_class_from_class_loader(env, h_name, init, link, h_loader, 892 h_prot, false, THREAD); 893 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 894 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 895 } 896 return result; 897 JVM_END 898 899 // Currently only called from the old verifier. 900 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 901 jboolean init, jclass from)) 902 JVMWrapper("JVM_FindClassFromClass"); 903 if (name == NULL) { 904 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 905 } 906 if ((int)strlen(name) > Symbol::max_length()) { 907 // It's impossible to create this class; the name cannot fit 908 // into the constant pool. 909 Exceptions::fthrow(THREAD_AND_LOCATION, 910 vmSymbols::java_lang_NoClassDefFoundError(), 911 "Class name exceeds maximum length of %d: %s", 912 Symbol::max_length(), 913 name); 914 return 0; 915 } 916 TempNewSymbol h_name = SymbolTable::new_symbol(name); 917 oop from_class_oop = JNIHandles::resolve(from); 918 Klass* from_class = (from_class_oop == NULL) 919 ? (Klass*)NULL 920 : java_lang_Class::as_Klass(from_class_oop); 921 oop class_loader = NULL; 922 oop protection_domain = NULL; 923 if (from_class != NULL) { 924 class_loader = from_class->class_loader(); 925 protection_domain = from_class->protection_domain(); 926 } 927 Handle h_loader(THREAD, class_loader); 928 Handle h_prot (THREAD, protection_domain); 929 jclass result = find_class_from_class_loader(env, h_name, init, false, h_loader, 930 h_prot, true, thread); 931 932 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 933 // this function is generally only used for class loading during verification. 934 ResourceMark rm; 935 oop from_mirror = JNIHandles::resolve_non_null(from); 936 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 937 const char * from_name = from_class->external_name(); 938 939 oop mirror = JNIHandles::resolve_non_null(result); 940 Klass* to_class = java_lang_Class::as_Klass(mirror); 941 const char * to = to_class->external_name(); 942 log_debug(class, resolve)("%s %s (verification)", from_name, to); 943 } 944 945 return result; 946 JVM_END 947 948 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 949 if (loader.is_null()) { 950 return; 951 } 952 953 // check whether the current caller thread holds the lock or not. 954 // If not, increment the corresponding counter 955 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 956 ObjectSynchronizer::owner_self) { 957 counter->inc(); 958 } 959 } 960 961 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 962 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 963 jobject loader, const jbyte *buf, 964 jsize len, jobject pd, const char *source, 965 TRAPS) { 966 if (source == NULL) source = "__JVM_DefineClass__"; 967 968 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 969 JavaThread* jt = (JavaThread*) THREAD; 970 971 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 972 ClassLoader::perf_define_appclass_selftime(), 973 ClassLoader::perf_define_appclasses(), 974 jt->get_thread_stat()->perf_recursion_counts_addr(), 975 jt->get_thread_stat()->perf_timers_addr(), 976 PerfClassTraceTime::DEFINE_CLASS); 977 978 if (UsePerfData) { 979 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 980 } 981 982 // Since exceptions can be thrown, class initialization can take place 983 // if name is NULL no check for class name in .class stream has to be made. 984 TempNewSymbol class_name = NULL; 985 if (name != NULL) { 986 const int str_len = (int)strlen(name); 987 if (str_len > Symbol::max_length()) { 988 // It's impossible to create this class; the name cannot fit 989 // into the constant pool. 990 Exceptions::fthrow(THREAD_AND_LOCATION, 991 vmSymbols::java_lang_NoClassDefFoundError(), 992 "Class name exceeds maximum length of %d: %s", 993 Symbol::max_length(), 994 name); 995 return 0; 996 } 997 class_name = SymbolTable::new_symbol(name, str_len); 998 } 999 1000 ResourceMark rm(THREAD); 1001 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 1002 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 1003 if (UsePerfData) { 1004 is_lock_held_by_thread(class_loader, 1005 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 1006 THREAD); 1007 } 1008 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1009 Klass* k = SystemDictionary::resolve_from_stream(class_name, 1010 class_loader, 1011 protection_domain, 1012 &st, 1013 CHECK_NULL); 1014 1015 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 1016 trace_class_resolution(k); 1017 } 1018 1019 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 1020 } 1021 1022 1023 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1024 JVMWrapper("JVM_DefineClass"); 1025 1026 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 1027 JVM_END 1028 1029 1030 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1031 JVMWrapper("JVM_DefineClassWithSource"); 1032 1033 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 1034 JVM_END 1035 1036 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1037 JVMWrapper("JVM_FindLoadedClass"); 1038 ResourceMark rm(THREAD); 1039 1040 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1041 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 1042 1043 const char* str = java_lang_String::as_utf8_string(string()); 1044 // Sanity check, don't expect null 1045 if (str == NULL) return NULL; 1046 1047 const int str_len = (int)strlen(str); 1048 if (str_len > Symbol::max_length()) { 1049 // It's impossible to create this class; the name cannot fit 1050 // into the constant pool. 1051 return NULL; 1052 } 1053 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1054 1055 // Security Note: 1056 // The Java level wrapper will perform the necessary security check allowing 1057 // us to pass the NULL as the initiating class loader. 1058 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1059 if (UsePerfData) { 1060 is_lock_held_by_thread(h_loader, 1061 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1062 THREAD); 1063 } 1064 1065 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1066 h_loader, 1067 Handle(), 1068 CHECK_NULL); 1069 #if INCLUDE_CDS 1070 if (k == NULL) { 1071 // If the class is not already loaded, try to see if it's in the shared 1072 // archive for the current classloader (h_loader). 1073 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1074 } 1075 #endif 1076 return (k == NULL) ? NULL : 1077 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1078 JVM_END 1079 1080 // Module support ////////////////////////////////////////////////////////////////////////////// 1081 1082 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1083 jstring location, const char* const* packages, jsize num_packages)) 1084 JVMWrapper("JVM_DefineModule"); 1085 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1086 JVM_END 1087 1088 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1089 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1090 Modules::set_bootloader_unnamed_module(module, CHECK); 1091 JVM_END 1092 1093 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1094 JVMWrapper("JVM_AddModuleExports"); 1095 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1096 JVM_END 1097 1098 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1099 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1100 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1101 JVM_END 1102 1103 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1104 JVMWrapper("JVM_AddModuleExportsToAll"); 1105 Modules::add_module_exports(from_module, package, NULL, CHECK); 1106 JVM_END 1107 1108 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1109 JVMWrapper("JVM_AddReadsModule"); 1110 Modules::add_reads_module(from_module, source_module, CHECK); 1111 JVM_END 1112 1113 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1114 1115 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1116 assert (cls != NULL, "illegal class"); 1117 JVMWrapper("JVM_InitClassName"); 1118 JvmtiVMObjectAllocEventCollector oam; 1119 ResourceMark rm(THREAD); 1120 HandleMark hm(THREAD); 1121 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1122 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1123 return (jstring) JNIHandles::make_local(env, result); 1124 JVM_END 1125 1126 1127 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1128 JVMWrapper("JVM_GetClassInterfaces"); 1129 JvmtiVMObjectAllocEventCollector oam; 1130 oop mirror = JNIHandles::resolve_non_null(cls); 1131 1132 // Special handling for primitive objects 1133 if (java_lang_Class::is_primitive(mirror)) { 1134 // Primitive objects does not have any interfaces 1135 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1136 return (jobjectArray) JNIHandles::make_local(env, r); 1137 } 1138 1139 Klass* klass = java_lang_Class::as_Klass(mirror); 1140 // Figure size of result array 1141 int size; 1142 if (klass->is_instance_klass()) { 1143 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1144 } else { 1145 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1146 size = 2; 1147 } 1148 1149 // Allocate result array 1150 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1151 objArrayHandle result (THREAD, r); 1152 // Fill in result 1153 if (klass->is_instance_klass()) { 1154 // Regular instance klass, fill in all local interfaces 1155 for (int index = 0; index < size; index++) { 1156 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1157 result->obj_at_put(index, k->java_mirror()); 1158 } 1159 } else { 1160 // All arrays implement java.lang.Cloneable and java.io.Serializable 1161 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1162 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1163 } 1164 return (jobjectArray) JNIHandles::make_local(env, result()); 1165 JVM_END 1166 1167 1168 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1169 JVMWrapper("JVM_IsInterface"); 1170 oop mirror = JNIHandles::resolve_non_null(cls); 1171 if (java_lang_Class::is_primitive(mirror)) { 1172 return JNI_FALSE; 1173 } 1174 Klass* k = java_lang_Class::as_Klass(mirror); 1175 jboolean result = k->is_interface(); 1176 assert(!result || k->is_instance_klass(), 1177 "all interfaces are instance types"); 1178 // The compiler intrinsic for isInterface tests the 1179 // Klass::_access_flags bits in the same way. 1180 return result; 1181 JVM_END 1182 1183 1184 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1185 JVMWrapper("JVM_GetClassSigners"); 1186 JvmtiVMObjectAllocEventCollector oam; 1187 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1188 // There are no signers for primitive types 1189 return NULL; 1190 } 1191 1192 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls))); 1193 1194 // If there are no signers set in the class, or if the class 1195 // is an array, return NULL. 1196 if (signers == NULL) return NULL; 1197 1198 // copy of the signers array 1199 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1200 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1201 for (int index = 0; index < signers->length(); index++) { 1202 signers_copy->obj_at_put(index, signers->obj_at(index)); 1203 } 1204 1205 // return the copy 1206 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1207 JVM_END 1208 1209 1210 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1211 JVMWrapper("JVM_SetClassSigners"); 1212 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1213 // This call is ignored for primitive types and arrays. 1214 // Signers are only set once, ClassLoader.java, and thus shouldn't 1215 // be called with an array. Only the bootstrap loader creates arrays. 1216 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1217 if (k->is_instance_klass()) { 1218 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1219 } 1220 } 1221 JVM_END 1222 1223 1224 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1225 JVMWrapper("JVM_GetProtectionDomain"); 1226 if (JNIHandles::resolve(cls) == NULL) { 1227 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1228 } 1229 1230 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1231 // Primitive types does not have a protection domain. 1232 return NULL; 1233 } 1234 1235 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1236 return (jobject) JNIHandles::make_local(env, pd); 1237 JVM_END 1238 1239 1240 // Returns the inherited_access_control_context field of the running thread. 1241 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1242 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1243 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1244 return JNIHandles::make_local(env, result); 1245 JVM_END 1246 1247 class RegisterArrayForGC { 1248 private: 1249 JavaThread *_thread; 1250 public: 1251 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1252 _thread = thread; 1253 _thread->register_array_for_gc(array); 1254 } 1255 1256 ~RegisterArrayForGC() { 1257 _thread->register_array_for_gc(NULL); 1258 } 1259 }; 1260 1261 1262 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1263 JVMWrapper("JVM_GetStackAccessControlContext"); 1264 if (!UsePrivilegedStack) return NULL; 1265 1266 ResourceMark rm(THREAD); 1267 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1268 JvmtiVMObjectAllocEventCollector oam; 1269 1270 // count the protection domains on the execution stack. We collapse 1271 // duplicate consecutive protection domains into a single one, as 1272 // well as stopping when we hit a privileged frame. 1273 1274 oop previous_protection_domain = NULL; 1275 Handle privileged_context(thread, NULL); 1276 bool is_privileged = false; 1277 oop protection_domain = NULL; 1278 1279 // Iterate through Java frames 1280 vframeStream vfst(thread); 1281 for(; !vfst.at_end(); vfst.next()) { 1282 // get method of frame 1283 Method* method = vfst.method(); 1284 1285 // stop at the first privileged frame 1286 if (method->method_holder() == SystemDictionary::AccessController_klass() && 1287 method->name() == vmSymbols::executePrivileged_name()) 1288 { 1289 // this frame is privileged 1290 is_privileged = true; 1291 1292 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1293 1294 StackValueCollection* locals = priv->locals(); 1295 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1296 StackValue* clr_sv = locals->at(2); // Class<?> caller 1297 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1298 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1299 privileged_context = ctx_sv->get_obj(); 1300 Handle caller = clr_sv->get_obj(); 1301 1302 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1303 protection_domain = caller_klass->protection_domain(); 1304 } else { 1305 protection_domain = method->method_holder()->protection_domain(); 1306 } 1307 1308 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) { 1309 local_array->push(protection_domain); 1310 previous_protection_domain = protection_domain; 1311 } 1312 1313 if (is_privileged) break; 1314 } 1315 1316 1317 // either all the domains on the stack were system domains, or 1318 // we had a privileged system domain 1319 if (local_array->is_empty()) { 1320 if (is_privileged && privileged_context.is_null()) return NULL; 1321 1322 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1323 return JNIHandles::make_local(env, result); 1324 } 1325 1326 // the resource area must be registered in case of a gc 1327 RegisterArrayForGC ragc(thread, local_array); 1328 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1329 local_array->length(), CHECK_NULL); 1330 objArrayHandle h_context(thread, context); 1331 for (int index = 0; index < local_array->length(); index++) { 1332 h_context->obj_at_put(index, local_array->at(index)); 1333 } 1334 1335 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1336 1337 return JNIHandles::make_local(env, result); 1338 JVM_END 1339 1340 1341 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1342 JVMWrapper("JVM_IsArrayClass"); 1343 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1344 return (k != NULL) && k->is_array_klass() ? true : false; 1345 JVM_END 1346 1347 1348 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1349 JVMWrapper("JVM_IsPrimitiveClass"); 1350 oop mirror = JNIHandles::resolve_non_null(cls); 1351 return (jboolean) java_lang_Class::is_primitive(mirror); 1352 JVM_END 1353 1354 1355 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1356 JVMWrapper("JVM_GetClassModifiers"); 1357 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1358 // Primitive type 1359 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1360 } 1361 1362 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1363 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1364 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1365 return k->modifier_flags(); 1366 JVM_END 1367 1368 1369 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1370 1371 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1372 JvmtiVMObjectAllocEventCollector oam; 1373 // ofClass is a reference to a java_lang_Class object. The mirror object 1374 // of an InstanceKlass 1375 1376 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1377 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1378 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1379 return (jobjectArray)JNIHandles::make_local(env, result); 1380 } 1381 1382 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1383 InnerClassesIterator iter(k); 1384 1385 if (iter.length() == 0) { 1386 // Neither an inner nor outer class 1387 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1388 return (jobjectArray)JNIHandles::make_local(env, result); 1389 } 1390 1391 // find inner class info 1392 constantPoolHandle cp(thread, k->constants()); 1393 int length = iter.length(); 1394 1395 // Allocate temp. result array 1396 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1397 objArrayHandle result (THREAD, r); 1398 int members = 0; 1399 1400 for (; !iter.done(); iter.next()) { 1401 int ioff = iter.inner_class_info_index(); 1402 int ooff = iter.outer_class_info_index(); 1403 1404 if (ioff != 0 && ooff != 0) { 1405 // Check to see if the name matches the class we're looking for 1406 // before attempting to find the class. 1407 if (cp->klass_name_at_matches(k, ooff)) { 1408 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1409 if (outer_klass == k) { 1410 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1411 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1412 1413 // Throws an exception if outer klass has not declared k as 1414 // an inner klass 1415 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1416 1417 result->obj_at_put(members, inner_klass->java_mirror()); 1418 members++; 1419 } 1420 } 1421 } 1422 } 1423 1424 if (members != length) { 1425 // Return array of right length 1426 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1427 for(int i = 0; i < members; i++) { 1428 res->obj_at_put(i, result->obj_at(i)); 1429 } 1430 return (jobjectArray)JNIHandles::make_local(env, res); 1431 } 1432 1433 return (jobjectArray)JNIHandles::make_local(env, result()); 1434 JVM_END 1435 1436 1437 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1438 { 1439 // ofClass is a reference to a java_lang_Class object. 1440 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1441 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1442 return NULL; 1443 } 1444 1445 bool inner_is_member = false; 1446 Klass* outer_klass 1447 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1448 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1449 if (outer_klass == NULL) return NULL; // already a top-level class 1450 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1451 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1452 } 1453 JVM_END 1454 1455 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1456 { 1457 oop mirror = JNIHandles::resolve_non_null(cls); 1458 if (java_lang_Class::is_primitive(mirror) || 1459 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1460 return NULL; 1461 } 1462 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1463 int ooff = 0, noff = 0; 1464 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1465 if (noff != 0) { 1466 constantPoolHandle i_cp(thread, k->constants()); 1467 Symbol* name = i_cp->symbol_at(noff); 1468 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1469 return (jstring) JNIHandles::make_local(env, str()); 1470 } 1471 } 1472 return NULL; 1473 } 1474 JVM_END 1475 1476 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1477 assert (cls != NULL, "illegal class"); 1478 JVMWrapper("JVM_GetClassSignature"); 1479 JvmtiVMObjectAllocEventCollector oam; 1480 ResourceMark rm(THREAD); 1481 // Return null for arrays and primatives 1482 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1483 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1484 if (k->is_instance_klass()) { 1485 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1486 if (sym == NULL) return NULL; 1487 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1488 return (jstring) JNIHandles::make_local(env, str()); 1489 } 1490 } 1491 return NULL; 1492 JVM_END 1493 1494 1495 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1496 assert (cls != NULL, "illegal class"); 1497 JVMWrapper("JVM_GetClassAnnotations"); 1498 1499 // Return null for arrays and primitives 1500 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1501 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1502 if (k->is_instance_klass()) { 1503 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1504 return (jbyteArray) JNIHandles::make_local(env, a); 1505 } 1506 } 1507 return NULL; 1508 JVM_END 1509 1510 1511 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1512 // some of this code was adapted from from jni_FromReflectedField 1513 1514 oop reflected = JNIHandles::resolve_non_null(field); 1515 oop mirror = java_lang_reflect_Field::clazz(reflected); 1516 Klass* k = java_lang_Class::as_Klass(mirror); 1517 int slot = java_lang_reflect_Field::slot(reflected); 1518 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1519 1520 InstanceKlass* ik = InstanceKlass::cast(k); 1521 intptr_t offset = ik->field_offset(slot); 1522 1523 if (modifiers & JVM_ACC_STATIC) { 1524 // for static fields we only look in the current class 1525 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1526 assert(false, "cannot find static field"); 1527 return false; 1528 } 1529 } else { 1530 // for instance fields we start with the current class and work 1531 // our way up through the superclass chain 1532 if (!ik->find_field_from_offset(offset, false, &fd)) { 1533 assert(false, "cannot find instance field"); 1534 return false; 1535 } 1536 } 1537 return true; 1538 } 1539 1540 static Method* jvm_get_method_common(jobject method) { 1541 // some of this code was adapted from from jni_FromReflectedMethod 1542 1543 oop reflected = JNIHandles::resolve_non_null(method); 1544 oop mirror = NULL; 1545 int slot = 0; 1546 1547 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1548 mirror = java_lang_reflect_Constructor::clazz(reflected); 1549 slot = java_lang_reflect_Constructor::slot(reflected); 1550 } else { 1551 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1552 "wrong type"); 1553 mirror = java_lang_reflect_Method::clazz(reflected); 1554 slot = java_lang_reflect_Method::slot(reflected); 1555 } 1556 Klass* k = java_lang_Class::as_Klass(mirror); 1557 1558 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1559 assert(m != NULL, "cannot find method"); 1560 return m; // caller has to deal with NULL in product mode 1561 } 1562 1563 /* Type use annotations support (JDK 1.8) */ 1564 1565 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1566 assert (cls != NULL, "illegal class"); 1567 JVMWrapper("JVM_GetClassTypeAnnotations"); 1568 ResourceMark rm(THREAD); 1569 // Return null for arrays and primitives 1570 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1572 if (k->is_instance_klass()) { 1573 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1574 if (type_annotations != NULL) { 1575 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1576 return (jbyteArray) JNIHandles::make_local(env, a); 1577 } 1578 } 1579 } 1580 return NULL; 1581 JVM_END 1582 1583 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1584 assert (method != NULL, "illegal method"); 1585 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1586 1587 // method is a handle to a java.lang.reflect.Method object 1588 Method* m = jvm_get_method_common(method); 1589 if (m == NULL) { 1590 return NULL; 1591 } 1592 1593 AnnotationArray* type_annotations = m->type_annotations(); 1594 if (type_annotations != NULL) { 1595 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1596 return (jbyteArray) JNIHandles::make_local(env, a); 1597 } 1598 1599 return NULL; 1600 JVM_END 1601 1602 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1603 assert (field != NULL, "illegal field"); 1604 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1605 1606 fieldDescriptor fd; 1607 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1608 if (!gotFd) { 1609 return NULL; 1610 } 1611 1612 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1613 JVM_END 1614 1615 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1616 if (!cp->is_within_bounds(index)) { 1617 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1618 } 1619 } 1620 1621 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1622 { 1623 JVMWrapper("JVM_GetMethodParameters"); 1624 // method is a handle to a java.lang.reflect.Method object 1625 Method* method_ptr = jvm_get_method_common(method); 1626 methodHandle mh (THREAD, method_ptr); 1627 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1628 const int num_params = mh->method_parameters_length(); 1629 1630 if (num_params < 0) { 1631 // A -1 return value from method_parameters_length means there is no 1632 // parameter data. Return null to indicate this to the reflection 1633 // API. 1634 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1635 return (jobjectArray)NULL; 1636 } else { 1637 // Otherwise, we return something up to reflection, even if it is 1638 // a zero-length array. Why? Because in some cases this can 1639 // trigger a MalformedParametersException. 1640 1641 // make sure all the symbols are properly formatted 1642 for (int i = 0; i < num_params; i++) { 1643 MethodParametersElement* params = mh->method_parameters_start(); 1644 int index = params[i].name_cp_index; 1645 bounds_check(mh->constants(), index, CHECK_NULL); 1646 1647 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1648 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1649 "Wrong type at constant pool index"); 1650 } 1651 1652 } 1653 1654 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1655 objArrayHandle result (THREAD, result_oop); 1656 1657 for (int i = 0; i < num_params; i++) { 1658 MethodParametersElement* params = mh->method_parameters_start(); 1659 // For a 0 index, give a NULL symbol 1660 Symbol* sym = 0 != params[i].name_cp_index ? 1661 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1662 int flags = params[i].flags; 1663 oop param = Reflection::new_parameter(reflected_method, i, sym, 1664 flags, CHECK_NULL); 1665 result->obj_at_put(i, param); 1666 } 1667 return (jobjectArray)JNIHandles::make_local(env, result()); 1668 } 1669 } 1670 JVM_END 1671 1672 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1673 1674 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1675 { 1676 JVMWrapper("JVM_GetClassDeclaredFields"); 1677 JvmtiVMObjectAllocEventCollector oam; 1678 1679 // Exclude primitive types and array types 1680 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1681 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1682 // Return empty array 1683 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1684 return (jobjectArray) JNIHandles::make_local(env, res); 1685 } 1686 1687 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1688 constantPoolHandle cp(THREAD, k->constants()); 1689 1690 // Ensure class is linked 1691 k->link_class(CHECK_NULL); 1692 1693 // Allocate result 1694 int num_fields; 1695 1696 if (publicOnly) { 1697 num_fields = 0; 1698 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1699 if (fs.access_flags().is_public()) ++num_fields; 1700 } 1701 } else { 1702 num_fields = k->java_fields_count(); 1703 } 1704 1705 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1706 objArrayHandle result (THREAD, r); 1707 1708 int out_idx = 0; 1709 fieldDescriptor fd; 1710 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1711 if (!publicOnly || fs.access_flags().is_public()) { 1712 fd.reinitialize(k, fs.index()); 1713 oop field = Reflection::new_field(&fd, CHECK_NULL); 1714 result->obj_at_put(out_idx, field); 1715 ++out_idx; 1716 } 1717 } 1718 assert(out_idx == num_fields, "just checking"); 1719 return (jobjectArray) JNIHandles::make_local(env, result()); 1720 } 1721 JVM_END 1722 1723 static bool select_method(const methodHandle& method, bool want_constructor) { 1724 if (want_constructor) { 1725 return (method->is_initializer() && !method->is_static()); 1726 } else { 1727 return (!method->is_initializer() && !method->is_overpass()); 1728 } 1729 } 1730 1731 static jobjectArray get_class_declared_methods_helper( 1732 JNIEnv *env, 1733 jclass ofClass, jboolean publicOnly, 1734 bool want_constructor, 1735 Klass* klass, TRAPS) { 1736 1737 JvmtiVMObjectAllocEventCollector oam; 1738 1739 // Exclude primitive types and array types 1740 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1741 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1742 // Return empty array 1743 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1744 return (jobjectArray) JNIHandles::make_local(env, res); 1745 } 1746 1747 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1748 1749 // Ensure class is linked 1750 k->link_class(CHECK_NULL); 1751 1752 Array<Method*>* methods = k->methods(); 1753 int methods_length = methods->length(); 1754 1755 // Save original method_idnum in case of redefinition, which can change 1756 // the idnum of obsolete methods. The new method will have the same idnum 1757 // but if we refresh the methods array, the counts will be wrong. 1758 ResourceMark rm(THREAD); 1759 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1760 int num_methods = 0; 1761 1762 for (int i = 0; i < methods_length; i++) { 1763 methodHandle method(THREAD, methods->at(i)); 1764 if (select_method(method, want_constructor)) { 1765 if (!publicOnly || method->is_public()) { 1766 idnums->push(method->method_idnum()); 1767 ++num_methods; 1768 } 1769 } 1770 } 1771 1772 // Allocate result 1773 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1774 objArrayHandle result (THREAD, r); 1775 1776 // Now just put the methods that we selected above, but go by their idnum 1777 // in case of redefinition. The methods can be redefined at any safepoint, 1778 // so above when allocating the oop array and below when creating reflect 1779 // objects. 1780 for (int i = 0; i < num_methods; i++) { 1781 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1782 if (method.is_null()) { 1783 // Method may have been deleted and seems this API can handle null 1784 // Otherwise should probably put a method that throws NSME 1785 result->obj_at_put(i, NULL); 1786 } else { 1787 oop m; 1788 if (want_constructor) { 1789 m = Reflection::new_constructor(method, CHECK_NULL); 1790 } else { 1791 m = Reflection::new_method(method, false, CHECK_NULL); 1792 } 1793 result->obj_at_put(i, m); 1794 } 1795 } 1796 1797 return (jobjectArray) JNIHandles::make_local(env, result()); 1798 } 1799 1800 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1801 { 1802 JVMWrapper("JVM_GetClassDeclaredMethods"); 1803 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1804 /*want_constructor*/ false, 1805 SystemDictionary::reflect_Method_klass(), THREAD); 1806 } 1807 JVM_END 1808 1809 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1810 { 1811 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1812 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1813 /*want_constructor*/ true, 1814 SystemDictionary::reflect_Constructor_klass(), THREAD); 1815 } 1816 JVM_END 1817 1818 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1819 { 1820 JVMWrapper("JVM_GetClassAccessFlags"); 1821 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1822 // Primitive type 1823 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1824 } 1825 1826 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1827 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1828 } 1829 JVM_END 1830 1831 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 1832 { 1833 JVMWrapper("JVM_AreNestMates"); 1834 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1835 assert(c->is_instance_klass(), "must be"); 1836 InstanceKlass* ck = InstanceKlass::cast(c); 1837 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 1838 assert(m->is_instance_klass(), "must be"); 1839 InstanceKlass* mk = InstanceKlass::cast(m); 1840 return ck->has_nestmate_access_to(mk, THREAD); 1841 } 1842 JVM_END 1843 1844 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 1845 { 1846 // current is not a primitive or array class 1847 JVMWrapper("JVM_GetNestHost"); 1848 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1849 assert(c->is_instance_klass(), "must be"); 1850 InstanceKlass* ck = InstanceKlass::cast(c); 1851 // Don't post exceptions if validation fails 1852 InstanceKlass* host = ck->nest_host(NULL, THREAD); 1853 return (jclass) (host == NULL ? NULL : 1854 JNIHandles::make_local(THREAD, host->java_mirror())); 1855 } 1856 JVM_END 1857 1858 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 1859 { 1860 // current is not a primitive or array class 1861 JVMWrapper("JVM_GetNestMembers"); 1862 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 1863 assert(c->is_instance_klass(), "must be"); 1864 InstanceKlass* ck = InstanceKlass::cast(c); 1865 // Get the nest host for this nest - throw ICCE if validation fails 1866 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError(); 1867 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL); 1868 1869 { 1870 JvmtiVMObjectAllocEventCollector oam; 1871 Array<u2>* members = host->nest_members(); 1872 int length = members == NULL ? 0 : members->length(); 1873 // nest host is first in the array so make it one bigger 1874 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 1875 length + 1, CHECK_NULL); 1876 objArrayHandle result (THREAD, r); 1877 result->obj_at_put(0, host->java_mirror()); 1878 if (length != 0) { 1879 int i; 1880 for (i = 0; i < length; i++) { 1881 int cp_index = members->at(i); 1882 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL); 1883 if (k->is_instance_klass()) { 1884 InstanceKlass* nest_host_k = 1885 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL); 1886 if (nest_host_k == host) { 1887 result->obj_at_put(i+1, k->java_mirror()); 1888 } 1889 else { 1890 // k's nest host is legal but it isn't our host so 1891 // throw ICCE 1892 ResourceMark rm(THREAD); 1893 Exceptions::fthrow(THREAD_AND_LOCATION, 1894 icce, 1895 "Nest member %s in %s declares a different nest host of %s", 1896 k->external_name(), 1897 host->external_name(), 1898 nest_host_k->external_name() 1899 ); 1900 return NULL; 1901 } 1902 } 1903 else { 1904 // we have a bad nest member entry - throw ICCE 1905 ResourceMark rm(THREAD); 1906 Exceptions::fthrow(THREAD_AND_LOCATION, 1907 icce, 1908 "Class %s can not be a nest member of %s", 1909 k->external_name(), 1910 host->external_name() 1911 ); 1912 return NULL; 1913 } 1914 } 1915 } 1916 else { 1917 assert(host == ck, "must be singleton nest"); 1918 } 1919 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 1920 } 1921 } 1922 JVM_END 1923 1924 // Constant pool access ////////////////////////////////////////////////////////// 1925 1926 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1927 { 1928 JVMWrapper("JVM_GetClassConstantPool"); 1929 JvmtiVMObjectAllocEventCollector oam; 1930 1931 // Return null for primitives and arrays 1932 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1933 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1934 if (k->is_instance_klass()) { 1935 InstanceKlass* k_h = InstanceKlass::cast(k); 1936 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1937 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1938 return JNIHandles::make_local(jcp()); 1939 } 1940 } 1941 return NULL; 1942 } 1943 JVM_END 1944 1945 1946 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1947 { 1948 JVMWrapper("JVM_ConstantPoolGetSize"); 1949 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1950 return cp->length(); 1951 } 1952 JVM_END 1953 1954 1955 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1956 { 1957 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1958 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1959 bounds_check(cp, index, CHECK_NULL); 1960 constantTag tag = cp->tag_at(index); 1961 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1962 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1963 } 1964 Klass* k = cp->klass_at(index, CHECK_NULL); 1965 return (jclass) JNIHandles::make_local(k->java_mirror()); 1966 } 1967 JVM_END 1968 1969 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1970 { 1971 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1972 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1973 bounds_check(cp, index, CHECK_NULL); 1974 constantTag tag = cp->tag_at(index); 1975 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1976 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1977 } 1978 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1979 if (k == NULL) return NULL; 1980 return (jclass) JNIHandles::make_local(k->java_mirror()); 1981 } 1982 JVM_END 1983 1984 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 1985 constantTag tag = cp->tag_at(index); 1986 if (!tag.is_method() && !tag.is_interface_method()) { 1987 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1988 } 1989 int klass_ref = cp->uncached_klass_ref_index_at(index); 1990 Klass* k_o; 1991 if (force_resolution) { 1992 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1993 } else { 1994 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1995 if (k_o == NULL) return NULL; 1996 } 1997 InstanceKlass* k = InstanceKlass::cast(k_o); 1998 Symbol* name = cp->uncached_name_ref_at(index); 1999 Symbol* sig = cp->uncached_signature_ref_at(index); 2000 methodHandle m (THREAD, k->find_method(name, sig)); 2001 if (m.is_null()) { 2002 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2003 } 2004 oop method; 2005 if (!m->is_initializer() || m->is_static()) { 2006 method = Reflection::new_method(m, true, CHECK_NULL); 2007 } else { 2008 method = Reflection::new_constructor(m, CHECK_NULL); 2009 } 2010 return JNIHandles::make_local(method); 2011 } 2012 2013 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2014 { 2015 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 2016 JvmtiVMObjectAllocEventCollector oam; 2017 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2018 bounds_check(cp, index, CHECK_NULL); 2019 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2020 return res; 2021 } 2022 JVM_END 2023 2024 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2025 { 2026 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2027 JvmtiVMObjectAllocEventCollector oam; 2028 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2029 bounds_check(cp, index, CHECK_NULL); 2030 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2031 return res; 2032 } 2033 JVM_END 2034 2035 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2036 constantTag tag = cp->tag_at(index); 2037 if (!tag.is_field()) { 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 Klass* k_o; 2042 if (force_resolution) { 2043 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2044 } else { 2045 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2046 if (k_o == NULL) return NULL; 2047 } 2048 InstanceKlass* k = InstanceKlass::cast(k_o); 2049 Symbol* name = cp->uncached_name_ref_at(index); 2050 Symbol* sig = cp->uncached_signature_ref_at(index); 2051 fieldDescriptor fd; 2052 Klass* target_klass = k->find_field(name, sig, &fd); 2053 if (target_klass == NULL) { 2054 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2055 } 2056 oop field = Reflection::new_field(&fd, CHECK_NULL); 2057 return JNIHandles::make_local(field); 2058 } 2059 2060 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2061 { 2062 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2063 JvmtiVMObjectAllocEventCollector oam; 2064 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2065 bounds_check(cp, index, CHECK_NULL); 2066 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2067 return res; 2068 } 2069 JVM_END 2070 2071 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2072 { 2073 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2074 JvmtiVMObjectAllocEventCollector oam; 2075 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2076 bounds_check(cp, index, CHECK_NULL); 2077 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2078 return res; 2079 } 2080 JVM_END 2081 2082 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2083 { 2084 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2085 JvmtiVMObjectAllocEventCollector oam; 2086 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2087 bounds_check(cp, index, CHECK_NULL); 2088 constantTag tag = cp->tag_at(index); 2089 if (!tag.is_field_or_method()) { 2090 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2091 } 2092 int klass_ref = cp->uncached_klass_ref_index_at(index); 2093 Symbol* klass_name = cp->klass_name_at(klass_ref); 2094 Symbol* member_name = cp->uncached_name_ref_at(index); 2095 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2096 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2097 objArrayHandle dest(THREAD, dest_o); 2098 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2099 dest->obj_at_put(0, str()); 2100 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2101 dest->obj_at_put(1, str()); 2102 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2103 dest->obj_at_put(2, str()); 2104 return (jobjectArray) JNIHandles::make_local(dest()); 2105 } 2106 JVM_END 2107 2108 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2109 { 2110 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2111 JvmtiVMObjectAllocEventCollector oam; 2112 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2113 bounds_check(cp, index, CHECK_0); 2114 constantTag tag = cp->tag_at(index); 2115 if (!tag.is_field_or_method()) { 2116 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2117 } 2118 return (jint) cp->uncached_klass_ref_index_at(index); 2119 } 2120 JVM_END 2121 2122 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2123 { 2124 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2125 JvmtiVMObjectAllocEventCollector oam; 2126 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2127 bounds_check(cp, index, CHECK_0); 2128 constantTag tag = cp->tag_at(index); 2129 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2130 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2131 } 2132 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2133 } 2134 JVM_END 2135 2136 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2137 { 2138 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2139 JvmtiVMObjectAllocEventCollector oam; 2140 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2141 bounds_check(cp, index, CHECK_NULL); 2142 constantTag tag = cp->tag_at(index); 2143 if (!tag.is_name_and_type()) { 2144 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2145 } 2146 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2147 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2148 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2149 objArrayHandle dest(THREAD, dest_o); 2150 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2151 dest->obj_at_put(0, str()); 2152 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2153 dest->obj_at_put(1, str()); 2154 return (jobjectArray) JNIHandles::make_local(dest()); 2155 } 2156 JVM_END 2157 2158 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2159 { 2160 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2161 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2162 bounds_check(cp, index, CHECK_0); 2163 constantTag tag = cp->tag_at(index); 2164 if (!tag.is_int()) { 2165 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2166 } 2167 return cp->int_at(index); 2168 } 2169 JVM_END 2170 2171 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2172 { 2173 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2174 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2175 bounds_check(cp, index, CHECK_(0L)); 2176 constantTag tag = cp->tag_at(index); 2177 if (!tag.is_long()) { 2178 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2179 } 2180 return cp->long_at(index); 2181 } 2182 JVM_END 2183 2184 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2185 { 2186 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2187 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2188 bounds_check(cp, index, CHECK_(0.0f)); 2189 constantTag tag = cp->tag_at(index); 2190 if (!tag.is_float()) { 2191 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2192 } 2193 return cp->float_at(index); 2194 } 2195 JVM_END 2196 2197 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2198 { 2199 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2200 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2201 bounds_check(cp, index, CHECK_(0.0)); 2202 constantTag tag = cp->tag_at(index); 2203 if (!tag.is_double()) { 2204 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2205 } 2206 return cp->double_at(index); 2207 } 2208 JVM_END 2209 2210 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2211 { 2212 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2213 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2214 bounds_check(cp, index, CHECK_NULL); 2215 constantTag tag = cp->tag_at(index); 2216 if (!tag.is_string()) { 2217 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2218 } 2219 oop str = cp->string_at(index, CHECK_NULL); 2220 return (jstring) JNIHandles::make_local(str); 2221 } 2222 JVM_END 2223 2224 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2225 { 2226 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2227 JvmtiVMObjectAllocEventCollector oam; 2228 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2229 bounds_check(cp, index, CHECK_NULL); 2230 constantTag tag = cp->tag_at(index); 2231 if (!tag.is_symbol()) { 2232 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2233 } 2234 Symbol* sym = cp->symbol_at(index); 2235 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2236 return (jstring) JNIHandles::make_local(str()); 2237 } 2238 JVM_END 2239 2240 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2241 { 2242 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2243 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2244 bounds_check(cp, index, CHECK_0); 2245 constantTag tag = cp->tag_at(index); 2246 jbyte result = tag.value(); 2247 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2248 // they are changed to the corresponding tags from the JVM spec, so that java code in 2249 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2250 if (tag.is_klass_or_reference()) { 2251 result = JVM_CONSTANT_Class; 2252 } else if (tag.is_string_index()) { 2253 result = JVM_CONSTANT_String; 2254 } else if (tag.is_method_type_in_error()) { 2255 result = JVM_CONSTANT_MethodType; 2256 } else if (tag.is_method_handle_in_error()) { 2257 result = JVM_CONSTANT_MethodHandle; 2258 } else if (tag.is_dynamic_constant_in_error()) { 2259 result = JVM_CONSTANT_Dynamic; 2260 } 2261 return result; 2262 } 2263 JVM_END 2264 2265 // Assertion support. ////////////////////////////////////////////////////////// 2266 2267 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2268 JVMWrapper("JVM_DesiredAssertionStatus"); 2269 assert(cls != NULL, "bad class"); 2270 2271 oop r = JNIHandles::resolve(cls); 2272 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2273 if (java_lang_Class::is_primitive(r)) return false; 2274 2275 Klass* k = java_lang_Class::as_Klass(r); 2276 assert(k->is_instance_klass(), "must be an instance klass"); 2277 if (!k->is_instance_klass()) return false; 2278 2279 ResourceMark rm(THREAD); 2280 const char* name = k->name()->as_C_string(); 2281 bool system_class = k->class_loader() == NULL; 2282 return JavaAssertions::enabled(name, system_class); 2283 2284 JVM_END 2285 2286 2287 // Return a new AssertionStatusDirectives object with the fields filled in with 2288 // command-line assertion arguments (i.e., -ea, -da). 2289 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2290 JVMWrapper("JVM_AssertionStatusDirectives"); 2291 JvmtiVMObjectAllocEventCollector oam; 2292 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2293 return JNIHandles::make_local(env, asd); 2294 JVM_END 2295 2296 // Verification //////////////////////////////////////////////////////////////////////////////// 2297 2298 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2299 2300 // RedefineClasses support: bug 6214132 caused verification to fail. 2301 // All functions from this section should call the jvmtiThreadSate function: 2302 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2303 // The function returns a Klass* of the _scratch_class if the verifier 2304 // was invoked in the middle of the class redefinition. 2305 // Otherwise it returns its argument value which is the _the_class Klass*. 2306 // Please, refer to the description in the jvmtiThreadSate.hpp. 2307 2308 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2309 JVMWrapper("JVM_GetClassNameUTF"); 2310 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2311 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2312 return k->name()->as_utf8(); 2313 JVM_END 2314 2315 2316 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2317 JVMWrapper("JVM_GetClassCPTypes"); 2318 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2319 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2320 // types will have length zero if this is not an InstanceKlass 2321 // (length is determined by call to JVM_GetClassCPEntriesCount) 2322 if (k->is_instance_klass()) { 2323 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2324 for (int index = cp->length() - 1; index >= 0; index--) { 2325 constantTag tag = cp->tag_at(index); 2326 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2327 } 2328 } 2329 JVM_END 2330 2331 2332 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2333 JVMWrapper("JVM_GetClassCPEntriesCount"); 2334 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2335 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2336 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2337 JVM_END 2338 2339 2340 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2341 JVMWrapper("JVM_GetClassFieldsCount"); 2342 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2343 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2344 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2345 JVM_END 2346 2347 2348 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2349 JVMWrapper("JVM_GetClassMethodsCount"); 2350 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2351 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2352 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2353 JVM_END 2354 2355 2356 // The following methods, used for the verifier, are never called with 2357 // array klasses, so a direct cast to InstanceKlass is safe. 2358 // Typically, these methods are called in a loop with bounds determined 2359 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2360 // zero for arrays. 2361 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2362 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2363 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2364 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2365 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2366 int length = method->checked_exceptions_length(); 2367 if (length > 0) { 2368 CheckedExceptionElement* table= method->checked_exceptions_start(); 2369 for (int i = 0; i < length; i++) { 2370 exceptions[i] = table[i].class_cp_index; 2371 } 2372 } 2373 JVM_END 2374 2375 2376 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2377 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2378 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2379 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2380 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2381 return method->checked_exceptions_length(); 2382 JVM_END 2383 2384 2385 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2386 JVMWrapper("JVM_GetMethodIxByteCode"); 2387 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2388 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2389 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2390 memcpy(code, method->code_base(), method->code_size()); 2391 JVM_END 2392 2393 2394 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2395 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2396 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2397 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2398 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2399 return method->code_size(); 2400 JVM_END 2401 2402 2403 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2404 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2405 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2406 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2407 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2408 ExceptionTable extable(method); 2409 entry->start_pc = extable.start_pc(entry_index); 2410 entry->end_pc = extable.end_pc(entry_index); 2411 entry->handler_pc = extable.handler_pc(entry_index); 2412 entry->catchType = extable.catch_type_index(entry_index); 2413 JVM_END 2414 2415 2416 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2417 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2418 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2419 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2420 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2421 return method->exception_table_length(); 2422 JVM_END 2423 2424 2425 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2426 JVMWrapper("JVM_GetMethodIxModifiers"); 2427 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2428 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2429 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2430 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2431 JVM_END 2432 2433 2434 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2435 JVMWrapper("JVM_GetFieldIxModifiers"); 2436 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2437 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2438 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2439 JVM_END 2440 2441 2442 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2443 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2444 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2445 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2446 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2447 return method->max_locals(); 2448 JVM_END 2449 2450 2451 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2452 JVMWrapper("JVM_GetMethodIxArgsSize"); 2453 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2454 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2455 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2456 return method->size_of_parameters(); 2457 JVM_END 2458 2459 2460 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2461 JVMWrapper("JVM_GetMethodIxMaxStack"); 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->verifier_max_stack(); 2466 JVM_END 2467 2468 2469 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2470 JVMWrapper("JVM_IsConstructorIx"); 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->name() == vmSymbols::object_initializer_name(); 2476 JVM_END 2477 2478 2479 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2480 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2481 ResourceMark rm(THREAD); 2482 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2483 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2484 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2485 return method->is_overpass(); 2486 JVM_END 2487 2488 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2489 JVMWrapper("JVM_GetMethodIxIxUTF"); 2490 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2491 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2492 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2493 return method->name()->as_utf8(); 2494 JVM_END 2495 2496 2497 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2498 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2499 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2500 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2501 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2502 return method->signature()->as_utf8(); 2503 JVM_END 2504 2505 /** 2506 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2507 * read entries in the constant pool. Since the old verifier always 2508 * works on a copy of the code, it will not see any rewriting that 2509 * may possibly occur in the middle of verification. So it is important 2510 * that nothing it calls tries to use the cpCache instead of the raw 2511 * constant pool, so we must use cp->uncached_x methods when appropriate. 2512 */ 2513 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2514 JVMWrapper("JVM_GetCPFieldNameUTF"); 2515 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2516 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2517 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2518 switch (cp->tag_at(cp_index).value()) { 2519 case JVM_CONSTANT_Fieldref: 2520 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2521 default: 2522 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2523 } 2524 ShouldNotReachHere(); 2525 return NULL; 2526 JVM_END 2527 2528 2529 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2530 JVMWrapper("JVM_GetCPMethodNameUTF"); 2531 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2532 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2533 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2534 switch (cp->tag_at(cp_index).value()) { 2535 case JVM_CONSTANT_InterfaceMethodref: 2536 case JVM_CONSTANT_Methodref: 2537 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2538 default: 2539 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2540 } 2541 ShouldNotReachHere(); 2542 return NULL; 2543 JVM_END 2544 2545 2546 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2547 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2548 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2549 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2550 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2551 switch (cp->tag_at(cp_index).value()) { 2552 case JVM_CONSTANT_InterfaceMethodref: 2553 case JVM_CONSTANT_Methodref: 2554 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2555 default: 2556 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2557 } 2558 ShouldNotReachHere(); 2559 return NULL; 2560 JVM_END 2561 2562 2563 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2564 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2565 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2566 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2567 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2568 switch (cp->tag_at(cp_index).value()) { 2569 case JVM_CONSTANT_Fieldref: 2570 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2571 default: 2572 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2573 } 2574 ShouldNotReachHere(); 2575 return NULL; 2576 JVM_END 2577 2578 2579 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2580 JVMWrapper("JVM_GetCPClassNameUTF"); 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 Symbol* classname = cp->klass_name_at(cp_index); 2585 return classname->as_utf8(); 2586 JVM_END 2587 2588 2589 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2590 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2591 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2592 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2593 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2594 switch (cp->tag_at(cp_index).value()) { 2595 case JVM_CONSTANT_Fieldref: { 2596 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2597 Symbol* classname = cp->klass_name_at(class_index); 2598 return classname->as_utf8(); 2599 } 2600 default: 2601 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2602 } 2603 ShouldNotReachHere(); 2604 return NULL; 2605 JVM_END 2606 2607 2608 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2609 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2610 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2611 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2612 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2613 switch (cp->tag_at(cp_index).value()) { 2614 case JVM_CONSTANT_Methodref: 2615 case JVM_CONSTANT_InterfaceMethodref: { 2616 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2617 Symbol* classname = cp->klass_name_at(class_index); 2618 return classname->as_utf8(); 2619 } 2620 default: 2621 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2622 } 2623 ShouldNotReachHere(); 2624 return NULL; 2625 JVM_END 2626 2627 2628 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2629 JVMWrapper("JVM_GetCPFieldModifiers"); 2630 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2631 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2632 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2633 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2634 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2635 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2636 switch (cp->tag_at(cp_index).value()) { 2637 case JVM_CONSTANT_Fieldref: { 2638 Symbol* name = cp->uncached_name_ref_at(cp_index); 2639 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2640 InstanceKlass* ik = InstanceKlass::cast(k_called); 2641 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2642 if (fs.name() == name && fs.signature() == signature) { 2643 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2644 } 2645 } 2646 return -1; 2647 } 2648 default: 2649 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2650 } 2651 ShouldNotReachHere(); 2652 return 0; 2653 JVM_END 2654 2655 2656 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2657 JVMWrapper("JVM_GetCPMethodModifiers"); 2658 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2659 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2660 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2661 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2662 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2663 switch (cp->tag_at(cp_index).value()) { 2664 case JVM_CONSTANT_Methodref: 2665 case JVM_CONSTANT_InterfaceMethodref: { 2666 Symbol* name = cp->uncached_name_ref_at(cp_index); 2667 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2668 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2669 int methods_count = methods->length(); 2670 for (int i = 0; i < methods_count; i++) { 2671 Method* method = methods->at(i); 2672 if (method->name() == name && method->signature() == signature) { 2673 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2674 } 2675 } 2676 return -1; 2677 } 2678 default: 2679 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2680 } 2681 ShouldNotReachHere(); 2682 return 0; 2683 JVM_END 2684 2685 2686 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2687 2688 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2689 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2690 JVM_END 2691 2692 2693 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2694 JVMWrapper("JVM_IsSameClassPackage"); 2695 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2696 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2697 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2698 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2699 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2700 JVM_END 2701 2702 // Printing support ////////////////////////////////////////////////// 2703 extern "C" { 2704 2705 ATTRIBUTE_PRINTF(3, 0) 2706 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2707 // Reject count values that are negative signed values converted to 2708 // unsigned; see bug 4399518, 4417214 2709 if ((intptr_t)count <= 0) return -1; 2710 2711 int result = os::vsnprintf(str, count, fmt, args); 2712 if (result > 0 && (size_t)result >= count) { 2713 result = -1; 2714 } 2715 2716 return result; 2717 } 2718 2719 ATTRIBUTE_PRINTF(3, 4) 2720 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2721 va_list args; 2722 int len; 2723 va_start(args, fmt); 2724 len = jio_vsnprintf(str, count, fmt, args); 2725 va_end(args); 2726 return len; 2727 } 2728 2729 ATTRIBUTE_PRINTF(2, 3) 2730 int jio_fprintf(FILE* f, const char *fmt, ...) { 2731 int len; 2732 va_list args; 2733 va_start(args, fmt); 2734 len = jio_vfprintf(f, fmt, args); 2735 va_end(args); 2736 return len; 2737 } 2738 2739 ATTRIBUTE_PRINTF(2, 0) 2740 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2741 if (Arguments::vfprintf_hook() != NULL) { 2742 return Arguments::vfprintf_hook()(f, fmt, args); 2743 } else { 2744 return vfprintf(f, fmt, args); 2745 } 2746 } 2747 2748 ATTRIBUTE_PRINTF(1, 2) 2749 JNIEXPORT int jio_printf(const char *fmt, ...) { 2750 int len; 2751 va_list args; 2752 va_start(args, fmt); 2753 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2754 va_end(args); 2755 return len; 2756 } 2757 2758 // HotSpot specific jio method 2759 void jio_print(const char* s, size_t len) { 2760 // Try to make this function as atomic as possible. 2761 if (Arguments::vfprintf_hook() != NULL) { 2762 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2763 } else { 2764 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2765 size_t count = ::write(defaultStream::output_fd(), s, (int)len); 2766 } 2767 } 2768 2769 } // Extern C 2770 2771 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2772 2773 // In most of the JVM thread support functions we need to access the 2774 // thread through a ThreadsListHandle to prevent it from exiting and 2775 // being reclaimed while we try to operate on it. The exceptions to this 2776 // rule are when operating on the current thread, or if the monitor of 2777 // the target java.lang.Thread is locked at the Java level - in both 2778 // cases the target cannot exit. 2779 2780 static void thread_entry(JavaThread* thread, TRAPS) { 2781 HandleMark hm(THREAD); 2782 Handle obj(THREAD, thread->threadObj()); 2783 JavaValue result(T_VOID); 2784 JavaCalls::call_virtual(&result, 2785 obj, 2786 SystemDictionary::Thread_klass(), 2787 vmSymbols::run_method_name(), 2788 vmSymbols::void_method_signature(), 2789 THREAD); 2790 } 2791 2792 2793 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2794 JVMWrapper("JVM_StartThread"); 2795 JavaThread *native_thread = NULL; 2796 2797 // We cannot hold the Threads_lock when we throw an exception, 2798 // due to rank ordering issues. Example: we might need to grab the 2799 // Heap_lock while we construct the exception. 2800 bool throw_illegal_thread_state = false; 2801 2802 // We must release the Threads_lock before we can post a jvmti event 2803 // in Thread::start. 2804 { 2805 // Ensure that the C++ Thread and OSThread structures aren't freed before 2806 // we operate. 2807 MutexLocker mu(Threads_lock); 2808 2809 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2810 // re-starting an already started thread, so we should usually find 2811 // that the JavaThread is null. However for a JNI attached thread 2812 // there is a small window between the Thread object being created 2813 // (with its JavaThread set) and the update to its threadStatus, so we 2814 // have to check for this 2815 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2816 throw_illegal_thread_state = true; 2817 } else { 2818 // We could also check the stillborn flag to see if this thread was already stopped, but 2819 // for historical reasons we let the thread detect that itself when it starts running 2820 2821 jlong size = 2822 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2823 // Allocate the C++ Thread structure and create the native thread. The 2824 // stack size retrieved from java is 64-bit signed, but the constructor takes 2825 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 2826 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 2827 // - Avoid passing negative values which would result in really large stacks. 2828 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 2829 size_t sz = size > 0 ? (size_t) size : 0; 2830 native_thread = new JavaThread(&thread_entry, sz); 2831 2832 // At this point it may be possible that no osthread was created for the 2833 // JavaThread due to lack of memory. Check for this situation and throw 2834 // an exception if necessary. Eventually we may want to change this so 2835 // that we only grab the lock if the thread was created successfully - 2836 // then we can also do this check and throw the exception in the 2837 // JavaThread constructor. 2838 if (native_thread->osthread() != NULL) { 2839 // Note: the current thread is not being used within "prepare". 2840 native_thread->prepare(jthread); 2841 } 2842 } 2843 } 2844 2845 if (throw_illegal_thread_state) { 2846 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2847 } 2848 2849 assert(native_thread != NULL, "Starting null thread?"); 2850 2851 if (native_thread->osthread() == NULL) { 2852 // No one should hold a reference to the 'native_thread'. 2853 native_thread->smr_delete(); 2854 if (JvmtiExport::should_post_resource_exhausted()) { 2855 JvmtiExport::post_resource_exhausted( 2856 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2857 os::native_thread_creation_failed_msg()); 2858 } 2859 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2860 os::native_thread_creation_failed_msg()); 2861 } 2862 2863 Thread::start(native_thread); 2864 2865 JVM_END 2866 2867 2868 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2869 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2870 // but is thought to be reliable and simple. In the case, where the receiver is the 2871 // same thread as the sender, no VM_Operation is needed. 2872 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2873 JVMWrapper("JVM_StopThread"); 2874 2875 // A nested ThreadsListHandle will grab the Threads_lock so create 2876 // tlh before we resolve throwable. 2877 ThreadsListHandle tlh(thread); 2878 oop java_throwable = JNIHandles::resolve(throwable); 2879 if (java_throwable == NULL) { 2880 THROW(vmSymbols::java_lang_NullPointerException()); 2881 } 2882 oop java_thread = NULL; 2883 JavaThread* receiver = NULL; 2884 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2885 Events::log_exception(thread, 2886 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2887 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2888 2889 if (is_alive) { 2890 // jthread refers to a live JavaThread. 2891 if (thread == receiver) { 2892 // Exception is getting thrown at self so no VM_Operation needed. 2893 THROW_OOP(java_throwable); 2894 } else { 2895 // Use a VM_Operation to throw the exception. 2896 Thread::send_async_exception(java_thread, java_throwable); 2897 } 2898 } else { 2899 // Either: 2900 // - target thread has not been started before being stopped, or 2901 // - target thread already terminated 2902 // We could read the threadStatus to determine which case it is 2903 // but that is overkill as it doesn't matter. We must set the 2904 // stillborn flag for the first case, and if the thread has already 2905 // exited setting this flag has no effect. 2906 java_lang_Thread::set_stillborn(java_thread); 2907 } 2908 JVM_END 2909 2910 2911 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2912 JVMWrapper("JVM_IsThreadAlive"); 2913 2914 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2915 return java_lang_Thread::is_alive(thread_oop); 2916 JVM_END 2917 2918 2919 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2920 JVMWrapper("JVM_SuspendThread"); 2921 2922 ThreadsListHandle tlh(thread); 2923 JavaThread* receiver = NULL; 2924 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2925 if (is_alive) { 2926 // jthread refers to a live JavaThread. 2927 { 2928 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2929 if (receiver->is_external_suspend()) { 2930 // Don't allow nested external suspend requests. We can't return 2931 // an error from this interface so just ignore the problem. 2932 return; 2933 } 2934 if (receiver->is_exiting()) { // thread is in the process of exiting 2935 return; 2936 } 2937 receiver->set_external_suspend(); 2938 } 2939 2940 // java_suspend() will catch threads in the process of exiting 2941 // and will ignore them. 2942 receiver->java_suspend(); 2943 2944 // It would be nice to have the following assertion in all the 2945 // time, but it is possible for a racing resume request to have 2946 // resumed this thread right after we suspended it. Temporarily 2947 // enable this assertion if you are chasing a different kind of 2948 // bug. 2949 // 2950 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2951 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2952 } 2953 JVM_END 2954 2955 2956 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2957 JVMWrapper("JVM_ResumeThread"); 2958 2959 ThreadsListHandle tlh(thread); 2960 JavaThread* receiver = NULL; 2961 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 2962 if (is_alive) { 2963 // jthread refers to a live JavaThread. 2964 2965 // This is the original comment for this Threads_lock grab: 2966 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2967 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2968 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2969 // looks at it. 2970 // 2971 // The above comment dates back to when we had both internal and 2972 // external suspend APIs that shared a common underlying mechanism. 2973 // External suspend is now entirely cooperative and doesn't share 2974 // anything with internal suspend. That said, there are some 2975 // assumptions in the VM that an external resume grabs the 2976 // Threads_lock. We can't drop the Threads_lock grab here until we 2977 // resolve the assumptions that exist elsewhere. 2978 // 2979 MutexLocker ml(Threads_lock); 2980 receiver->java_resume(); 2981 } 2982 JVM_END 2983 2984 2985 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2986 JVMWrapper("JVM_SetThreadPriority"); 2987 2988 ThreadsListHandle tlh(thread); 2989 oop java_thread = NULL; 2990 JavaThread* receiver = NULL; 2991 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 2992 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2993 2994 if (is_alive) { 2995 // jthread refers to a live JavaThread. 2996 Thread::set_priority(receiver, (ThreadPriority)prio); 2997 } 2998 // Implied else: If the JavaThread hasn't started yet, then the 2999 // priority set in the java.lang.Thread object above will be pushed 3000 // down when it does start. 3001 JVM_END 3002 3003 3004 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3005 JVMWrapper("JVM_Yield"); 3006 if (os::dont_yield()) return; 3007 HOTSPOT_THREAD_YIELD(); 3008 os::naked_yield(); 3009 JVM_END 3010 3011 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) { 3012 assert(event != NULL, "invariant"); 3013 assert(event->should_commit(), "invariant"); 3014 event->set_time(millis); 3015 event->commit(); 3016 } 3017 3018 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3019 JVMWrapper("JVM_Sleep"); 3020 3021 if (millis < 0) { 3022 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3023 } 3024 3025 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 3026 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3027 } 3028 3029 // Save current thread state and restore it at the end of this block. 3030 // And set new thread state to SLEEPING. 3031 JavaThreadSleepState jtss(thread); 3032 3033 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3034 EventThreadSleep event; 3035 3036 if (millis == 0) { 3037 os::naked_yield(); 3038 } else { 3039 ThreadState old_state = thread->osthread()->get_state(); 3040 thread->osthread()->set_state(SLEEPING); 3041 if (os::sleep(thread, millis) == OS_INTRPT) { 3042 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3043 // us while we were sleeping. We do not overwrite those. 3044 if (!HAS_PENDING_EXCEPTION) { 3045 if (event.should_commit()) { 3046 post_thread_sleep_event(&event, millis); 3047 } 3048 HOTSPOT_THREAD_SLEEP_END(1); 3049 3050 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3051 // to properly restore the thread state. That's likely wrong. 3052 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3053 } 3054 } 3055 thread->osthread()->set_state(old_state); 3056 } 3057 if (event.should_commit()) { 3058 post_thread_sleep_event(&event, millis); 3059 } 3060 HOTSPOT_THREAD_SLEEP_END(0); 3061 JVM_END 3062 3063 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3064 JVMWrapper("JVM_CurrentThread"); 3065 oop jthread = thread->threadObj(); 3066 assert (thread != NULL, "no current thread!"); 3067 return JNIHandles::make_local(env, jthread); 3068 JVM_END 3069 3070 class CountStackFramesTC : public ThreadClosure { 3071 int _count; 3072 bool _suspended; 3073 public: 3074 CountStackFramesTC() : _count(0), _suspended(false) {} 3075 virtual void do_thread(Thread* thread) { 3076 JavaThread* jt = (JavaThread*)thread; 3077 if (!jt->is_external_suspend()) { 3078 // To keep same behavior we fail this operation, 3079 // even if it would work perfectly. 3080 return; 3081 } 3082 _suspended = true; 3083 // Count all java activation, i.e., number of vframes. 3084 for (vframeStream vfst(jt); !vfst.at_end(); vfst.next()) { 3085 // Native frames are not counted. 3086 if (!vfst.method()->is_native()) _count++; 3087 } 3088 } 3089 int count() { return _count; } 3090 int suspended() { return _suspended; } 3091 }; 3092 3093 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3094 JVMWrapper("JVM_CountStackFrames"); 3095 3096 ThreadsListHandle tlh(thread); 3097 JavaThread* receiver = NULL; 3098 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3099 if (is_alive) { 3100 // jthread refers to a live JavaThread. 3101 CountStackFramesTC csf; 3102 Handshake::execute(&csf, receiver); 3103 if (!csf.suspended()) { 3104 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3105 "this thread is not suspended"); 3106 } 3107 return csf.count(); 3108 } 3109 // Implied else: if JavaThread is not alive simply return a count of 0. 3110 return 0; 3111 JVM_END 3112 3113 3114 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3115 JVMWrapper("JVM_Interrupt"); 3116 3117 ThreadsListHandle tlh(thread); 3118 JavaThread* receiver = NULL; 3119 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3120 if (is_alive) { 3121 // jthread refers to a live JavaThread. 3122 Thread::interrupt(receiver); 3123 } 3124 JVM_END 3125 3126 3127 JVM_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3128 JVMWrapper("JVM_IsInterrupted"); 3129 3130 ThreadsListHandle tlh(thread); 3131 JavaThread* receiver = NULL; 3132 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3133 if (is_alive) { 3134 // jthread refers to a live JavaThread. 3135 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0); 3136 } else { 3137 return JNI_FALSE; 3138 } 3139 JVM_END 3140 3141 3142 // Return true iff the current thread has locked the object passed in 3143 3144 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3145 JVMWrapper("JVM_HoldsLock"); 3146 assert(THREAD->is_Java_thread(), "sanity check"); 3147 if (obj == NULL) { 3148 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3149 } 3150 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3151 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3152 JVM_END 3153 3154 3155 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3156 JVMWrapper("JVM_DumpAllStacks"); 3157 VM_PrintThreads op; 3158 VMThread::execute(&op); 3159 if (JvmtiExport::should_post_data_dump()) { 3160 JvmtiExport::post_data_dump(); 3161 } 3162 JVM_END 3163 3164 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3165 JVMWrapper("JVM_SetNativeThreadName"); 3166 3167 // We don't use a ThreadsListHandle here because the current thread 3168 // must be alive. 3169 oop java_thread = JNIHandles::resolve_non_null(jthread); 3170 JavaThread* thr = java_lang_Thread::thread(java_thread); 3171 if (thread == thr && !thr->has_attached_via_jni()) { 3172 // Thread naming is only supported for the current thread and 3173 // we don't set the name of an attached thread to avoid stepping 3174 // on other programs. 3175 ResourceMark rm(thread); 3176 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3177 os::set_native_thread_name(thread_name); 3178 } 3179 JVM_END 3180 3181 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3182 3183 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3184 JVMWrapper("JVM_GetClassContext"); 3185 ResourceMark rm(THREAD); 3186 JvmtiVMObjectAllocEventCollector oam; 3187 vframeStream vfst(thread); 3188 3189 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3190 // This must only be called from SecurityManager.getClassContext 3191 Method* m = vfst.method(); 3192 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3193 m->name() == vmSymbols::getClassContext_name() && 3194 m->signature() == vmSymbols::void_class_array_signature())) { 3195 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3196 } 3197 } 3198 3199 // Collect method holders 3200 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3201 for (; !vfst.at_end(); vfst.security_next()) { 3202 Method* m = vfst.method(); 3203 // Native frames are not returned 3204 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3205 Klass* holder = m->method_holder(); 3206 assert(holder->is_klass(), "just checking"); 3207 klass_array->append(holder); 3208 } 3209 } 3210 3211 // Create result array of type [Ljava/lang/Class; 3212 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3213 // Fill in mirrors corresponding to method holders 3214 for (int i = 0; i < klass_array->length(); i++) { 3215 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3216 } 3217 3218 return (jobjectArray) JNIHandles::make_local(env, result); 3219 JVM_END 3220 3221 3222 // java.lang.Package //////////////////////////////////////////////////////////////// 3223 3224 3225 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3226 JVMWrapper("JVM_GetSystemPackage"); 3227 ResourceMark rm(THREAD); 3228 JvmtiVMObjectAllocEventCollector oam; 3229 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3230 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3231 return (jstring) JNIHandles::make_local(result); 3232 JVM_END 3233 3234 3235 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3236 JVMWrapper("JVM_GetSystemPackages"); 3237 JvmtiVMObjectAllocEventCollector oam; 3238 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3239 return (jobjectArray) JNIHandles::make_local(result); 3240 JVM_END 3241 3242 3243 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3244 3245 3246 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3247 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3248 3249 MonitorLocker ml(Heap_lock); 3250 oop ref = Universe::reference_pending_list(); 3251 if (ref != NULL) { 3252 Universe::set_reference_pending_list(NULL); 3253 } 3254 return JNIHandles::make_local(env, ref); 3255 JVM_END 3256 3257 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3258 JVMWrapper("JVM_HasReferencePendingList"); 3259 MonitorLocker ml(Heap_lock); 3260 return Universe::has_reference_pending_list(); 3261 JVM_END 3262 3263 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3264 JVMWrapper("JVM_WaitForReferencePendingList"); 3265 MonitorLocker ml(Heap_lock); 3266 while (!Universe::has_reference_pending_list()) { 3267 ml.wait(); 3268 } 3269 JVM_END 3270 3271 3272 // ObjectInputStream /////////////////////////////////////////////////////////////// 3273 3274 // Return the first user-defined class loader up the execution stack, or null 3275 // if only code from the bootstrap or platform class loader is on the stack. 3276 3277 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3278 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3279 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3280 oop loader = vfst.method()->method_holder()->class_loader(); 3281 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3282 return JNIHandles::make_local(env, loader); 3283 } 3284 } 3285 return NULL; 3286 JVM_END 3287 3288 3289 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3290 3291 3292 // resolve array handle and check arguments 3293 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3294 if (arr == NULL) { 3295 THROW_0(vmSymbols::java_lang_NullPointerException()); 3296 } 3297 oop a = JNIHandles::resolve_non_null(arr); 3298 if (!a->is_array()) { 3299 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3300 } else if (type_array_only && !a->is_typeArray()) { 3301 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3302 } 3303 return arrayOop(a); 3304 } 3305 3306 3307 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3308 JVMWrapper("JVM_GetArrayLength"); 3309 arrayOop a = check_array(env, arr, false, CHECK_0); 3310 return a->length(); 3311 JVM_END 3312 3313 3314 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3315 JVMWrapper("JVM_Array_Get"); 3316 JvmtiVMObjectAllocEventCollector oam; 3317 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3318 jvalue value; 3319 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3320 oop box = Reflection::box(&value, type, CHECK_NULL); 3321 return JNIHandles::make_local(env, box); 3322 JVM_END 3323 3324 3325 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3326 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3327 jvalue value; 3328 value.i = 0; // to initialize value before getting used in CHECK 3329 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3330 assert(a->is_typeArray(), "just checking"); 3331 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3332 BasicType wide_type = (BasicType) wCode; 3333 if (type != wide_type) { 3334 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3335 } 3336 return value; 3337 JVM_END 3338 3339 3340 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3341 JVMWrapper("JVM_SetArrayElement"); 3342 arrayOop a = check_array(env, arr, false, CHECK); 3343 oop box = JNIHandles::resolve(val); 3344 jvalue value; 3345 value.i = 0; // to initialize value before getting used in CHECK 3346 BasicType value_type; 3347 if (a->is_objArray()) { 3348 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3349 value_type = Reflection::unbox_for_regular_object(box, &value); 3350 } else { 3351 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3352 } 3353 Reflection::array_set(&value, a, index, value_type, CHECK); 3354 JVM_END 3355 3356 3357 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3358 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3359 arrayOop a = check_array(env, arr, true, CHECK); 3360 assert(a->is_typeArray(), "just checking"); 3361 BasicType value_type = (BasicType) vCode; 3362 Reflection::array_set(&v, a, index, value_type, CHECK); 3363 JVM_END 3364 3365 3366 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3367 JVMWrapper("JVM_NewArray"); 3368 JvmtiVMObjectAllocEventCollector oam; 3369 oop element_mirror = JNIHandles::resolve(eltClass); 3370 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3371 return JNIHandles::make_local(env, result); 3372 JVM_END 3373 3374 3375 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3376 JVMWrapper("JVM_NewMultiArray"); 3377 JvmtiVMObjectAllocEventCollector oam; 3378 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3379 oop element_mirror = JNIHandles::resolve(eltClass); 3380 assert(dim_array->is_typeArray(), "just checking"); 3381 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3382 return JNIHandles::make_local(env, result); 3383 JVM_END 3384 3385 3386 // Library support /////////////////////////////////////////////////////////////////////////// 3387 3388 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3389 //%note jvm_ct 3390 JVMWrapper("JVM_LoadLibrary"); 3391 char ebuf[1024]; 3392 void *load_result; 3393 { 3394 ThreadToNativeFromVM ttnfvm(thread); 3395 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3396 } 3397 if (load_result == NULL) { 3398 char msg[1024]; 3399 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3400 // Since 'ebuf' may contain a string encoded using 3401 // platform encoding scheme, we need to pass 3402 // Exceptions::unsafe_to_utf8 to the new_exception method 3403 // as the last argument. See bug 6367357. 3404 Handle h_exception = 3405 Exceptions::new_exception(thread, 3406 vmSymbols::java_lang_UnsatisfiedLinkError(), 3407 msg, Exceptions::unsafe_to_utf8); 3408 3409 THROW_HANDLE_0(h_exception); 3410 } 3411 return load_result; 3412 JVM_END 3413 3414 3415 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3416 JVMWrapper("JVM_UnloadLibrary"); 3417 os::dll_unload(handle); 3418 JVM_END 3419 3420 3421 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3422 JVMWrapper("JVM_FindLibraryEntry"); 3423 return os::dll_lookup(handle, name); 3424 JVM_END 3425 3426 3427 // JNI version /////////////////////////////////////////////////////////////////////////////// 3428 3429 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3430 JVMWrapper("JVM_IsSupportedJNIVersion"); 3431 return Threads::is_supported_jni_version_including_1_1(version); 3432 JVM_END 3433 3434 3435 // String support /////////////////////////////////////////////////////////////////////////// 3436 3437 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3438 JVMWrapper("JVM_InternString"); 3439 JvmtiVMObjectAllocEventCollector oam; 3440 if (str == NULL) return NULL; 3441 oop string = JNIHandles::resolve_non_null(str); 3442 oop result = StringTable::intern(string, CHECK_NULL); 3443 return (jstring) JNIHandles::make_local(env, result); 3444 JVM_END 3445 3446 3447 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3448 3449 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3450 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3451 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3452 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3453 // nature. JavaThreads will be "in native" when using this API from JDK code. 3454 3455 3456 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3457 VM_Exit::block_if_vm_exited(); 3458 JVMWrapper("JVM_RawMonitorCreate"); 3459 return new os::PlatformMutex(); 3460 } 3461 3462 3463 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3464 VM_Exit::block_if_vm_exited(); 3465 JVMWrapper("JVM_RawMonitorDestroy"); 3466 delete ((os::PlatformMutex*) mon); 3467 } 3468 3469 3470 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3471 VM_Exit::block_if_vm_exited(); 3472 JVMWrapper("JVM_RawMonitorEnter"); 3473 ((os::PlatformMutex*) mon)->lock(); 3474 return 0; 3475 } 3476 3477 3478 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3479 VM_Exit::block_if_vm_exited(); 3480 JVMWrapper("JVM_RawMonitorExit"); 3481 ((os::PlatformMutex*) mon)->unlock(); 3482 } 3483 3484 3485 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3486 3487 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, jboolean link, 3488 Handle loader, Handle protection_domain, 3489 jboolean throwError, TRAPS) { 3490 // Initialization also implies linking - check for coherent args 3491 assert((init && link) || !init, "incorrect use of init/link arguments"); 3492 3493 // Security Note: 3494 // The Java level wrapper will perform the necessary security check allowing 3495 // us to pass the NULL as the initiating class loader. The VM is responsible for 3496 // the checkPackageAccess relative to the initiating class loader via the 3497 // protection_domain. The protection_domain is passed as NULL by the java code 3498 // if there is no security manager in 3-arg Class.forName(). 3499 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3500 3501 // Check if we should initialize the class (which implies linking), or just link it 3502 if (init && klass->is_instance_klass()) { 3503 klass->initialize(CHECK_NULL); 3504 } else if (link && klass->is_instance_klass()) { 3505 InstanceKlass::cast(klass)->link_class(CHECK_NULL); 3506 } 3507 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3508 } 3509 3510 3511 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3512 3513 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3514 JVMWrapper("JVM_InvokeMethod"); 3515 Handle method_handle; 3516 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3517 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3518 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3519 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3520 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3521 jobject res = JNIHandles::make_local(env, result); 3522 if (JvmtiExport::should_post_vm_object_alloc()) { 3523 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3524 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3525 if (java_lang_Class::is_primitive(ret_type)) { 3526 // Only for primitive type vm allocates memory for java object. 3527 // See box() method. 3528 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3529 } 3530 } 3531 return res; 3532 } else { 3533 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3534 } 3535 JVM_END 3536 3537 3538 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3539 JVMWrapper("JVM_NewInstanceFromConstructor"); 3540 oop constructor_mirror = JNIHandles::resolve(c); 3541 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3542 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3543 jobject res = JNIHandles::make_local(env, result); 3544 if (JvmtiExport::should_post_vm_object_alloc()) { 3545 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3546 } 3547 return res; 3548 JVM_END 3549 3550 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3551 3552 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3553 JVMWrapper("JVM_SupportsCX8"); 3554 return VM_Version::supports_cx8(); 3555 JVM_END 3556 3557 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3558 JVMWrapper("JVM_InitializeFromArchive"); 3559 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3560 assert(k->is_klass(), "just checking"); 3561 HeapShared::initialize_from_archived_subgraph(k); 3562 JVM_END 3563 3564 // Returns an array of all live Thread objects (VM internal JavaThreads, 3565 // jvmti agent threads, and JNI attaching threads are skipped) 3566 // See CR 6404306 regarding JNI attaching threads 3567 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3568 ResourceMark rm(THREAD); 3569 ThreadsListEnumerator tle(THREAD, false, false); 3570 JvmtiVMObjectAllocEventCollector oam; 3571 3572 int num_threads = tle.num_threads(); 3573 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3574 objArrayHandle threads_ah(THREAD, r); 3575 3576 for (int i = 0; i < num_threads; i++) { 3577 Handle h = tle.get_threadObj(i); 3578 threads_ah->obj_at_put(i, h()); 3579 } 3580 3581 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3582 JVM_END 3583 3584 3585 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3586 // Return StackTraceElement[][], each element is the stack trace of a thread in 3587 // the corresponding entry in the given threads array 3588 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3589 JVMWrapper("JVM_DumpThreads"); 3590 JvmtiVMObjectAllocEventCollector oam; 3591 3592 // Check if threads is null 3593 if (threads == NULL) { 3594 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3595 } 3596 3597 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3598 objArrayHandle ah(THREAD, a); 3599 int num_threads = ah->length(); 3600 // check if threads is non-empty array 3601 if (num_threads == 0) { 3602 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3603 } 3604 3605 // check if threads is not an array of objects of Thread class 3606 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3607 if (k != SystemDictionary::Thread_klass()) { 3608 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3609 } 3610 3611 ResourceMark rm(THREAD); 3612 3613 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3614 for (int i = 0; i < num_threads; i++) { 3615 oop thread_obj = ah->obj_at(i); 3616 instanceHandle h(THREAD, (instanceOop) thread_obj); 3617 thread_handle_array->append(h); 3618 } 3619 3620 // The JavaThread references in thread_handle_array are validated 3621 // in VM_ThreadDump::doit(). 3622 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3623 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3624 3625 JVM_END 3626 3627 // JVM monitoring and management support 3628 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3629 return Management::get_jmm_interface(version); 3630 JVM_END 3631 3632 // com.sun.tools.attach.VirtualMachine agent properties support 3633 // 3634 // Initialize the agent properties with the properties maintained in the VM 3635 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3636 JVMWrapper("JVM_InitAgentProperties"); 3637 ResourceMark rm; 3638 3639 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3640 3641 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3642 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3643 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3644 return properties; 3645 JVM_END 3646 3647 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3648 { 3649 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3650 JvmtiVMObjectAllocEventCollector oam; 3651 3652 if (ofClass == NULL) { 3653 return NULL; 3654 } 3655 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3656 // Special handling for primitive objects 3657 if (java_lang_Class::is_primitive(mirror())) { 3658 return NULL; 3659 } 3660 Klass* k = java_lang_Class::as_Klass(mirror()); 3661 if (!k->is_instance_klass()) { 3662 return NULL; 3663 } 3664 InstanceKlass* ik = InstanceKlass::cast(k); 3665 int encl_method_class_idx = ik->enclosing_method_class_index(); 3666 if (encl_method_class_idx == 0) { 3667 return NULL; 3668 } 3669 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3670 objArrayHandle dest(THREAD, dest_o); 3671 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3672 dest->obj_at_put(0, enc_k->java_mirror()); 3673 int encl_method_method_idx = ik->enclosing_method_method_index(); 3674 if (encl_method_method_idx != 0) { 3675 Symbol* sym = ik->constants()->symbol_at( 3676 extract_low_short_from_int( 3677 ik->constants()->name_and_type_at(encl_method_method_idx))); 3678 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3679 dest->obj_at_put(1, str()); 3680 sym = ik->constants()->symbol_at( 3681 extract_high_short_from_int( 3682 ik->constants()->name_and_type_at(encl_method_method_idx))); 3683 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3684 dest->obj_at_put(2, str()); 3685 } 3686 return (jobjectArray) JNIHandles::make_local(dest()); 3687 } 3688 JVM_END 3689 3690 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3691 { 3692 memset(info, 0, info_size); 3693 3694 info->jvm_version = VM_Version::jvm_version(); 3695 info->patch_version = VM_Version::vm_patch_version(); 3696 3697 // when we add a new capability in the jvm_version_info struct, we should also 3698 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3699 // counter defined in runtimeService.cpp. 3700 info->is_attach_supported = AttachListener::is_attach_supported(); 3701 } 3702 JVM_END 3703 3704 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3705 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3706 ResourceMark rm(THREAD); 3707 3708 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3709 return NULL; 3710 } 3711 3712 char** vm_flags = Arguments::jvm_flags_array(); 3713 char** vm_args = Arguments::jvm_args_array(); 3714 int num_flags = Arguments::num_jvm_flags(); 3715 int num_args = Arguments::num_jvm_args(); 3716 3717 InstanceKlass* ik = SystemDictionary::String_klass(); 3718 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3719 objArrayHandle result_h(THREAD, r); 3720 3721 int index = 0; 3722 for (int j = 0; j < num_flags; j++, index++) { 3723 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3724 result_h->obj_at_put(index, h()); 3725 } 3726 for (int i = 0; i < num_args; i++, index++) { 3727 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3728 result_h->obj_at_put(index, h()); 3729 } 3730 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3731 JVM_END 3732 3733 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3734 return os::get_signal_number(name); 3735 JVM_END