1 /* 2 * Copyright (c) 1997, 2020, 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.inline.hpp" 52 #include "oops/instanceKlass.hpp" 53 #include "oops/method.hpp" 54 #include "oops/recordComponent.hpp" 55 #include "oops/objArrayKlass.hpp" 56 #include "oops/objArrayOop.inline.hpp" 57 #include "oops/oop.inline.hpp" 58 #include "prims/jvm_misc.hpp" 59 #include "prims/jvmtiExport.hpp" 60 #include "prims/jvmtiThreadState.hpp" 61 #include "prims/nativeLookup.hpp" 62 #include "prims/stackwalk.hpp" 63 #include "runtime/arguments.hpp" 64 #include "runtime/atomic.hpp" 65 #include "runtime/handles.inline.hpp" 66 #include "runtime/init.hpp" 67 #include "runtime/interfaceSupport.inline.hpp" 68 #include "runtime/deoptimization.hpp" 69 #include "runtime/handshake.hpp" 70 #include "runtime/java.hpp" 71 #include "runtime/javaCalls.hpp" 72 #include "runtime/jfieldIDWorkaround.hpp" 73 #include "runtime/jniHandles.inline.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 #include <jfr/recorder/jfrRecorder.hpp> 98 99 /* 100 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 101 such ctors and calls MUST NOT come between an oop declaration/init and its 102 usage because if objects are move this may cause various memory stomps, bus 103 errors and segfaults. Here is a cookbook for causing so called "naked oop 104 failures": 105 106 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 107 JVMWrapper("JVM_GetClassDeclaredFields"); 108 109 // Object address to be held directly in mirror & not visible to GC 110 oop mirror = JNIHandles::resolve_non_null(ofClass); 111 112 // If this ctor can hit a safepoint, moving objects around, then 113 ComplexConstructor foo; 114 115 // Boom! mirror may point to JUNK instead of the intended object 116 (some dereference of mirror) 117 118 // Here's another call that may block for GC, making mirror stale 119 MutexLocker ml(some_lock); 120 121 // And here's an initializer that can result in a stale oop 122 // all in one step. 123 oop o = call_that_can_throw_exception(TRAPS); 124 125 126 The solution is to keep the oop declaration BELOW the ctor or function 127 call that might cause a GC, do another resolve to reassign the oop, or 128 consider use of a Handle instead of an oop so there is immunity from object 129 motion. But note that the "QUICK" entries below do not have a handlemark 130 and thus can only support use of handles passed in. 131 */ 132 133 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 134 ResourceMark rm; 135 int line_number = -1; 136 const char * source_file = NULL; 137 const char * trace = "explicit"; 138 InstanceKlass* caller = NULL; 139 JavaThread* jthread = JavaThread::current(); 140 if (jthread->has_last_Java_frame()) { 141 vframeStream vfst(jthread); 142 143 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 144 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController"); 145 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 146 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction"); 147 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 148 149 Method* last_caller = NULL; 150 151 while (!vfst.at_end()) { 152 Method* m = vfst.method(); 153 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 154 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 155 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 156 break; 157 } 158 last_caller = m; 159 vfst.next(); 160 } 161 // if this is called from Class.forName0 and that is called from Class.forName, 162 // then print the caller of Class.forName. If this is Class.loadClass, then print 163 // that caller, otherwise keep quiet since this should be picked up elsewhere. 164 bool found_it = false; 165 if (!vfst.at_end() && 166 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 167 vfst.method()->name() == vmSymbols::forName0_name()) { 168 vfst.next(); 169 if (!vfst.at_end() && 170 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 171 vfst.method()->name() == vmSymbols::forName_name()) { 172 vfst.next(); 173 found_it = true; 174 } 175 } else if (last_caller != NULL && 176 last_caller->method_holder()->name() == 177 vmSymbols::java_lang_ClassLoader() && 178 last_caller->name() == vmSymbols::loadClass_name()) { 179 found_it = true; 180 } else if (!vfst.at_end()) { 181 if (vfst.method()->is_native()) { 182 // JNI call 183 found_it = true; 184 } 185 } 186 if (found_it && !vfst.at_end()) { 187 // found the caller 188 caller = vfst.method()->method_holder(); 189 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 190 if (line_number == -1) { 191 // show method name if it's a native method 192 trace = vfst.method()->name_and_sig_as_C_string(); 193 } 194 Symbol* s = caller->source_file_name(); 195 if (s != NULL) { 196 source_file = s->as_C_string(); 197 } 198 } 199 } 200 if (caller != NULL) { 201 if (to_class != caller) { 202 const char * from = caller->external_name(); 203 const char * to = to_class->external_name(); 204 // print in a single call to reduce interleaving between threads 205 if (source_file != NULL) { 206 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 207 } else { 208 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 209 } 210 } 211 } 212 } 213 214 void trace_class_resolution(Klass* to_class) { 215 EXCEPTION_MARK; 216 trace_class_resolution_impl(to_class, THREAD); 217 if (HAS_PENDING_EXCEPTION) { 218 CLEAR_PENDING_EXCEPTION; 219 } 220 } 221 222 // Wrapper to trace JVM functions 223 224 #ifdef ASSERT 225 Histogram* JVMHistogram; 226 volatile int JVMHistogram_lock = 0; 227 228 class JVMHistogramElement : public HistogramElement { 229 public: 230 JVMHistogramElement(const char* name); 231 }; 232 233 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 234 _name = elementName; 235 uintx count = 0; 236 237 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) { 238 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) { 239 count +=1; 240 if ( (WarnOnStalledSpinLock > 0) 241 && (count % WarnOnStalledSpinLock == 0)) { 242 warning("JVMHistogram_lock seems to be stalled"); 243 } 244 } 245 } 246 247 if(JVMHistogram == NULL) 248 JVMHistogram = new Histogram("JVM Call Counts",100); 249 250 JVMHistogram->add_element(this); 251 Atomic::dec(&JVMHistogram_lock); 252 } 253 254 #define JVMCountWrapper(arg) \ 255 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 256 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 257 258 #define JVMWrapper(arg) JVMCountWrapper(arg); 259 #else 260 #define JVMWrapper(arg) 261 #endif 262 263 264 // Interface version ///////////////////////////////////////////////////////////////////// 265 266 267 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 268 return JVM_INTERFACE_VERSION; 269 JVM_END 270 271 272 // java.lang.System ////////////////////////////////////////////////////////////////////// 273 274 275 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 276 JVMWrapper("JVM_CurrentTimeMillis"); 277 return os::javaTimeMillis(); 278 JVM_END 279 280 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 281 JVMWrapper("JVM_NanoTime"); 282 return os::javaTimeNanos(); 283 JVM_END 284 285 // The function below is actually exposed by jdk.internal.misc.VM and not 286 // java.lang.System, but we choose to keep it here so that it stays next 287 // to JVM_CurrentTimeMillis and JVM_NanoTime 288 289 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 290 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 291 292 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 293 JVMWrapper("JVM_GetNanoTimeAdjustment"); 294 jlong seconds; 295 jlong nanos; 296 297 os::javaTimeSystemUTC(seconds, nanos); 298 299 // We're going to verify that the result can fit in a long. 300 // For that we need the difference in seconds between 'seconds' 301 // and 'offset_secs' to be such that: 302 // |seconds - offset_secs| < (2^63/10^9) 303 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 304 // which makes |seconds - offset_secs| < 2^33 305 // and we will prefer +/- 2^32 as the maximum acceptable diff 306 // as 2^32 has a more natural feel than 2^33... 307 // 308 // So if |seconds - offset_secs| >= 2^32 - we return a special 309 // sentinel value (-1) which the caller should take as an 310 // exception value indicating that the offset given to us is 311 // too far from range of the current time - leading to too big 312 // a nano adjustment. The caller is expected to recover by 313 // computing a more accurate offset and calling this method 314 // again. (For the record 2^32 secs is ~136 years, so that 315 // should rarely happen) 316 // 317 jlong diff = seconds - offset_secs; 318 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 319 return -1; // sentinel value: the offset is too far off the target 320 } 321 322 // return the adjustment. If you compute a time by adding 323 // this number of nanoseconds along with the number of seconds 324 // in the offset you should get the current UTC time. 325 return (diff * (jlong)1000000000) + nanos; 326 JVM_END 327 328 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 329 jobject dst, jint dst_pos, jint length)) 330 JVMWrapper("JVM_ArrayCopy"); 331 // Check if we have null pointers 332 if (src == NULL || dst == NULL) { 333 THROW(vmSymbols::java_lang_NullPointerException()); 334 } 335 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 336 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 337 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 338 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 339 // Do copy 340 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 341 JVM_END 342 343 344 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 345 JavaValue r(T_OBJECT); 346 // public synchronized Object put(Object key, Object value); 347 HandleMark hm(THREAD); 348 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 349 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 350 JavaCalls::call_virtual(&r, 351 props, 352 SystemDictionary::Properties_klass(), 353 vmSymbols::put_name(), 354 vmSymbols::object_object_object_signature(), 355 key_str, 356 value_str, 357 THREAD); 358 } 359 360 361 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 362 363 /* 364 * Return all of the system properties in a Java String array with alternating 365 * names and values from the jvm SystemProperty. 366 * Which includes some internal and all commandline -D defined properties. 367 */ 368 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 369 JVMWrapper("JVM_GetProperties"); 370 ResourceMark rm(THREAD); 371 HandleMark hm(THREAD); 372 int ndx = 0; 373 int fixedCount = 2; 374 375 SystemProperty* p = Arguments::system_properties(); 376 int count = Arguments::PropertyList_count(p); 377 378 // Allocate result String array 379 InstanceKlass* ik = SystemDictionary::String_klass(); 380 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 381 objArrayHandle result_h(THREAD, r); 382 383 while (p != NULL) { 384 const char * key = p->key(); 385 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 386 const char * value = p->value(); 387 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 388 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL); 389 result_h->obj_at_put(ndx * 2, key_str()); 390 result_h->obj_at_put(ndx * 2 + 1, value_str()); 391 ndx++; 392 } 393 p = p->next(); 394 } 395 396 // Convert the -XX:MaxDirectMemorySize= command line flag 397 // to the sun.nio.MaxDirectMemorySize property. 398 // Do this after setting user properties to prevent people 399 // from setting the value with a -D option, as requested. 400 // Leave empty if not supplied 401 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 402 char as_chars[256]; 403 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 404 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 405 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 406 result_h->obj_at_put(ndx * 2, key_str()); 407 result_h->obj_at_put(ndx * 2 + 1, value_str()); 408 ndx++; 409 } 410 411 // JVM monitoring and management support 412 // Add the sun.management.compiler property for the compiler's name 413 { 414 #undef CSIZE 415 #if defined(_LP64) || defined(_WIN64) 416 #define CSIZE "64-Bit " 417 #else 418 #define CSIZE 419 #endif // 64bit 420 421 #ifdef TIERED 422 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 423 #else 424 #if defined(COMPILER1) 425 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 426 #elif defined(COMPILER2) 427 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 428 #elif INCLUDE_JVMCI 429 #error "INCLUDE_JVMCI should imply TIERED" 430 #else 431 const char* compiler_name = ""; 432 #endif // compilers 433 #endif // TIERED 434 435 if (*compiler_name != '\0' && 436 (Arguments::mode() != Arguments::_int)) { 437 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 438 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 439 result_h->obj_at_put(ndx * 2, key_str()); 440 result_h->obj_at_put(ndx * 2 + 1, value_str()); 441 ndx++; 442 } 443 } 444 445 return (jobjectArray) JNIHandles::make_local(env, result_h()); 446 JVM_END 447 448 449 /* 450 * Return the temporary directory that the VM uses for the attach 451 * and perf data files. 452 * 453 * It is important that this directory is well-known and the 454 * same for all VM instances. It cannot be affected by configuration 455 * variables such as java.io.tmpdir. 456 */ 457 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 458 JVMWrapper("JVM_GetTemporaryDirectory"); 459 HandleMark hm(THREAD); 460 const char* temp_dir = os::get_temp_directory(); 461 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 462 return (jstring) JNIHandles::make_local(env, h()); 463 JVM_END 464 465 466 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 467 468 extern volatile jint vm_created; 469 470 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 471 JVMWrapper("JVM_BeforeHalt"); 472 // Link all classes for dynamic CDS dumping before vm exit. 473 if (DynamicDumpSharedSpaces) { 474 MetaspaceShared::link_and_cleanup_shared_classes(THREAD); 475 } 476 EventShutdown event; 477 if (event.should_commit()) { 478 event.set_reason("Shutdown requested from Java"); 479 event.commit(); 480 } 481 JVM_END 482 483 484 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 485 before_exit(thread); 486 vm_exit(code); 487 JVM_END 488 489 490 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 491 JVMWrapper("JVM_GC"); 492 if (!DisableExplicitGC) { 493 Universe::heap()->collect(GCCause::_java_lang_system_gc); 494 } 495 JVM_END 496 497 498 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 499 JVMWrapper("JVM_MaxObjectInspectionAge"); 500 return Universe::heap()->millis_since_last_gc(); 501 JVM_END 502 503 504 static inline jlong convert_size_t_to_jlong(size_t val) { 505 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 506 NOT_LP64 (return (jlong)val;) 507 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 508 } 509 510 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 511 JVMWrapper("JVM_TotalMemory"); 512 size_t n = Universe::heap()->capacity(); 513 return convert_size_t_to_jlong(n); 514 JVM_END 515 516 517 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 518 JVMWrapper("JVM_FreeMemory"); 519 size_t n = Universe::heap()->unused(); 520 return convert_size_t_to_jlong(n); 521 JVM_END 522 523 524 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 525 JVMWrapper("JVM_MaxMemory"); 526 size_t n = Universe::heap()->max_capacity(); 527 return convert_size_t_to_jlong(n); 528 JVM_END 529 530 531 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 532 JVMWrapper("JVM_ActiveProcessorCount"); 533 return os::active_processor_count(); 534 JVM_END 535 536 537 538 // java.lang.Throwable ////////////////////////////////////////////////////// 539 540 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 541 JVMWrapper("JVM_FillInStackTrace"); 542 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 543 java_lang_Throwable::fill_in_stack_trace(exception); 544 JVM_END 545 546 // java.lang.NullPointerException /////////////////////////////////////////// 547 548 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 549 if (!ShowCodeDetailsInExceptionMessages) return NULL; 550 551 oop exc = JNIHandles::resolve_non_null(throwable); 552 553 Method* method; 554 int bci; 555 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 556 return NULL; 557 } 558 if (method->is_native()) { 559 return NULL; 560 } 561 562 stringStream ss; 563 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 564 if (ok) { 565 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 566 return (jstring) JNIHandles::make_local(env, result); 567 } else { 568 return NULL; 569 } 570 JVM_END 571 572 // java.lang.StackTraceElement ////////////////////////////////////////////// 573 574 575 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 576 JVMWrapper("JVM_InitStackTraceElementArray"); 577 Handle exception(THREAD, JNIHandles::resolve(throwable)); 578 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 579 objArrayHandle stack_trace(THREAD, st); 580 // Fill in the allocated stack trace 581 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 582 JVM_END 583 584 585 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 586 JVMWrapper("JVM_InitStackTraceElement"); 587 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 588 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 589 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 590 JVM_END 591 592 593 // java.lang.StackWalker ////////////////////////////////////////////////////// 594 595 596 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 597 jint skip_frames, jint frame_count, jint start_index, 598 jobjectArray frames)) 599 JVMWrapper("JVM_CallStackWalk"); 600 JavaThread* jt = (JavaThread*) THREAD; 601 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 602 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 603 } 604 605 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 606 607 // frames array is a Class<?>[] array when only getting caller reference, 608 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 609 // be null. 610 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 611 objArrayHandle frames_array_h(THREAD, fa); 612 613 int limit = start_index + frame_count; 614 if (frames_array_h->length() < limit) { 615 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 616 } 617 618 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 619 start_index, frames_array_h, CHECK_NULL); 620 return JNIHandles::make_local(env, result); 621 JVM_END 622 623 624 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 625 jint frame_count, jint start_index, 626 jobjectArray frames)) 627 JVMWrapper("JVM_MoreStackWalk"); 628 JavaThread* jt = (JavaThread*) THREAD; 629 630 // frames array is a Class<?>[] array when only getting caller reference, 631 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 632 // be null. 633 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 634 objArrayHandle frames_array_h(THREAD, fa); 635 636 int limit = start_index+frame_count; 637 if (frames_array_h->length() < limit) { 638 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 639 } 640 641 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 642 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 643 start_index, frames_array_h, THREAD); 644 JVM_END 645 646 // java.lang.Object /////////////////////////////////////////////// 647 648 649 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 650 JVMWrapper("JVM_IHashCode"); 651 // as implemented in the classic virtual machine; return 0 if object is NULL 652 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 653 JVM_END 654 655 656 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 657 JVMWrapper("JVM_MonitorWait"); 658 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 659 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 660 if (JvmtiExport::should_post_monitor_wait()) { 661 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 662 663 // The current thread already owns the monitor and it has not yet 664 // been added to the wait queue so the current thread cannot be 665 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 666 // event handler cannot accidentally consume an unpark() meant for 667 // the ParkEvent associated with this ObjectMonitor. 668 } 669 ObjectSynchronizer::wait(obj, ms, CHECK); 670 JVM_END 671 672 673 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 674 JVMWrapper("JVM_MonitorNotify"); 675 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 676 ObjectSynchronizer::notify(obj, CHECK); 677 JVM_END 678 679 680 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 681 JVMWrapper("JVM_MonitorNotifyAll"); 682 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 683 ObjectSynchronizer::notifyall(obj, CHECK); 684 JVM_END 685 686 687 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 688 JVMWrapper("JVM_Clone"); 689 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 690 Klass* klass = obj->klass(); 691 JvmtiVMObjectAllocEventCollector oam; 692 693 #ifdef ASSERT 694 // Just checking that the cloneable flag is set correct 695 if (obj->is_array()) { 696 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 697 } else { 698 guarantee(obj->is_instance(), "should be instanceOop"); 699 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 700 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 701 } 702 #endif 703 704 // Check if class of obj supports the Cloneable interface. 705 // All arrays are considered to be cloneable (See JLS 20.1.5). 706 // All j.l.r.Reference classes are considered non-cloneable. 707 if (!klass->is_cloneable() || 708 (klass->is_instance_klass() && 709 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 710 ResourceMark rm(THREAD); 711 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 712 } 713 714 // Make shallow object copy 715 const int size = obj->size(); 716 oop new_obj_oop = NULL; 717 if (obj->is_array()) { 718 const int length = ((arrayOop)obj())->length(); 719 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 720 /* do_zero */ true, CHECK_NULL); 721 } else { 722 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 723 } 724 725 HeapAccess<>::clone(obj(), new_obj_oop, size); 726 727 Handle new_obj(THREAD, new_obj_oop); 728 // Caution: this involves a java upcall, so the clone should be 729 // "gc-robust" by this stage. 730 if (klass->has_finalizer()) { 731 assert(obj->is_instance(), "should be instanceOop"); 732 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 733 new_obj = Handle(THREAD, new_obj_oop); 734 } 735 736 return JNIHandles::make_local(env, new_obj()); 737 JVM_END 738 739 // java.io.File /////////////////////////////////////////////////////////////// 740 741 JVM_LEAF(char*, JVM_NativePath(char* path)) 742 JVMWrapper("JVM_NativePath"); 743 return os::native_path(path); 744 JVM_END 745 746 747 // Misc. class handling /////////////////////////////////////////////////////////// 748 749 750 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 751 JVMWrapper("JVM_GetCallerClass"); 752 753 // Getting the class of the caller frame. 754 // 755 // The call stack at this point looks something like this: 756 // 757 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 758 // [1] [ @CallerSensitive API.method ] 759 // [.] [ (skipped intermediate frames) ] 760 // [n] [ caller ] 761 vframeStream vfst(thread); 762 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 763 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 764 Method* m = vfst.method(); 765 assert(m != NULL, "sanity"); 766 switch (n) { 767 case 0: 768 // This must only be called from Reflection.getCallerClass 769 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 770 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 771 } 772 // fall-through 773 case 1: 774 // Frame 0 and 1 must be caller sensitive. 775 if (!m->caller_sensitive()) { 776 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 777 } 778 break; 779 default: 780 if (!m->is_ignored_by_security_stack_walk()) { 781 // We have reached the desired frame; return the holder class. 782 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 783 } 784 break; 785 } 786 } 787 return NULL; 788 JVM_END 789 790 791 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 792 JVMWrapper("JVM_FindPrimitiveClass"); 793 oop mirror = NULL; 794 BasicType t = name2type(utf); 795 if (t != T_ILLEGAL && !is_reference_type(t)) { 796 mirror = Universe::java_mirror(t); 797 } 798 if (mirror == NULL) { 799 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 800 } else { 801 return (jclass) JNIHandles::make_local(env, mirror); 802 } 803 JVM_END 804 805 806 // Returns a class loaded by the bootstrap class loader; or null 807 // if not found. ClassNotFoundException is not thrown. 808 // FindClassFromBootLoader is exported to the launcher for windows. 809 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 810 const char* name)) 811 JVMWrapper("JVM_FindClassFromBootLoader"); 812 813 // Java libraries should ensure that name is never null... 814 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 815 // It's impossible to create this class; the name cannot fit 816 // into the constant pool. 817 return NULL; 818 } 819 820 TempNewSymbol h_name = SymbolTable::new_symbol(name); 821 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 822 if (k == NULL) { 823 return NULL; 824 } 825 826 if (log_is_enabled(Debug, class, resolve)) { 827 trace_class_resolution(k); 828 } 829 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 830 JVM_END 831 832 // Find a class with this name in this loader, using the caller's protection domain. 833 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 834 jboolean init, jobject loader, 835 jclass caller)) 836 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 837 // Java libraries should ensure that name is never null... 838 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 839 // It's impossible to create this class; the name cannot fit 840 // into the constant pool. 841 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 842 } 843 844 TempNewSymbol h_name = SymbolTable::new_symbol(name); 845 846 oop loader_oop = JNIHandles::resolve(loader); 847 oop from_class = JNIHandles::resolve(caller); 848 oop protection_domain = NULL; 849 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 850 // NPE. Put it in another way, the bootstrap class loader has all permission and 851 // thus no checkPackageAccess equivalence in the VM class loader. 852 // The caller is also passed as NULL by the java code if there is no security 853 // manager to avoid the performance cost of getting the calling class. 854 if (from_class != NULL && loader_oop != NULL) { 855 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 856 } 857 858 Handle h_loader(THREAD, loader_oop); 859 Handle h_prot(THREAD, protection_domain); 860 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 861 h_prot, false, THREAD); 862 863 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 864 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 865 } 866 return result; 867 JVM_END 868 869 // Currently only called from the old verifier. 870 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 871 jboolean init, jclass from)) 872 JVMWrapper("JVM_FindClassFromClass"); 873 if (name == NULL) { 874 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 875 } 876 if ((int)strlen(name) > Symbol::max_length()) { 877 // It's impossible to create this class; the name cannot fit 878 // into the constant pool. 879 Exceptions::fthrow(THREAD_AND_LOCATION, 880 vmSymbols::java_lang_NoClassDefFoundError(), 881 "Class name exceeds maximum length of %d: %s", 882 Symbol::max_length(), 883 name); 884 return 0; 885 } 886 TempNewSymbol h_name = SymbolTable::new_symbol(name); 887 oop from_class_oop = JNIHandles::resolve(from); 888 Klass* from_class = (from_class_oop == NULL) 889 ? (Klass*)NULL 890 : java_lang_Class::as_Klass(from_class_oop); 891 oop class_loader = NULL; 892 oop protection_domain = NULL; 893 if (from_class != NULL) { 894 class_loader = from_class->class_loader(); 895 protection_domain = from_class->protection_domain(); 896 } 897 Handle h_loader(THREAD, class_loader); 898 Handle h_prot (THREAD, protection_domain); 899 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 900 h_prot, true, thread); 901 902 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 903 // this function is generally only used for class loading during verification. 904 ResourceMark rm; 905 oop from_mirror = JNIHandles::resolve_non_null(from); 906 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 907 const char * from_name = from_class->external_name(); 908 909 oop mirror = JNIHandles::resolve_non_null(result); 910 Klass* to_class = java_lang_Class::as_Klass(mirror); 911 const char * to = to_class->external_name(); 912 log_debug(class, resolve)("%s %s (verification)", from_name, to); 913 } 914 915 return result; 916 JVM_END 917 918 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 919 if (loader.is_null()) { 920 return; 921 } 922 923 // check whether the current caller thread holds the lock or not. 924 // If not, increment the corresponding counter 925 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 926 ObjectSynchronizer::owner_self) { 927 counter->inc(); 928 } 929 } 930 931 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 932 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 933 jobject loader, const jbyte *buf, 934 jsize len, jobject pd, const char *source, 935 TRAPS) { 936 if (source == NULL) source = "__JVM_DefineClass__"; 937 938 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 939 JavaThread* jt = (JavaThread*) THREAD; 940 941 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 942 ClassLoader::perf_define_appclass_selftime(), 943 ClassLoader::perf_define_appclasses(), 944 jt->get_thread_stat()->perf_recursion_counts_addr(), 945 jt->get_thread_stat()->perf_timers_addr(), 946 PerfClassTraceTime::DEFINE_CLASS); 947 948 if (UsePerfData) { 949 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 950 } 951 952 // Since exceptions can be thrown, class initialization can take place 953 // if name is NULL no check for class name in .class stream has to be made. 954 TempNewSymbol class_name = NULL; 955 if (name != NULL) { 956 const int str_len = (int)strlen(name); 957 if (str_len > Symbol::max_length()) { 958 // It's impossible to create this class; the name cannot fit 959 // into the constant pool. 960 Exceptions::fthrow(THREAD_AND_LOCATION, 961 vmSymbols::java_lang_NoClassDefFoundError(), 962 "Class name exceeds maximum length of %d: %s", 963 Symbol::max_length(), 964 name); 965 return 0; 966 } 967 class_name = SymbolTable::new_symbol(name, str_len); 968 } 969 970 ResourceMark rm(THREAD); 971 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 972 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 973 if (UsePerfData) { 974 is_lock_held_by_thread(class_loader, 975 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 976 THREAD); 977 } 978 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 979 Klass* k = SystemDictionary::resolve_from_stream(class_name, 980 class_loader, 981 protection_domain, 982 &st, 983 CHECK_NULL); 984 985 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 986 trace_class_resolution(k); 987 } 988 989 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 990 } 991 992 enum { 993 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 994 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 995 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 996 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 997 }; 998 999 /* 1000 * Define a class with the specified flags that indicates if it's a nestmate, 1001 * hidden, or strongly referenced from class loader. 1002 */ 1003 static jclass jvm_lookup_define_class(JNIEnv *env, jclass lookup, const char *name, 1004 const jbyte *buf, jsize len, jobject pd, 1005 jboolean init, int flags, jobject classData, TRAPS) { 1006 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 1007 JavaThread* jt = (JavaThread*) THREAD; 1008 ResourceMark rm(THREAD); 1009 1010 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup)); 1011 // Lookup class must be a non-null instance 1012 if (lookup_k == NULL) { 1013 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1014 } 1015 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass"); 1016 1017 Handle class_loader (THREAD, lookup_k->class_loader()); 1018 1019 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 1020 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1021 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1022 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1023 1024 InstanceKlass* host_class = NULL; 1025 if (is_nestmate) { 1026 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL); 1027 } 1028 1029 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1030 name, 1031 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1032 is_nestmate ? host_class->external_name() : "", 1033 is_hidden ? "hidden" : "not hidden", 1034 is_strong ? "strong" : "weak", 1035 vm_annotations ? "with vm annotations" : "without vm annotation"); 1036 1037 if (!is_hidden) { 1038 // classData is only applicable for hidden classes 1039 if (classData != NULL) { 1040 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1041 } 1042 if (is_nestmate) { 1043 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1044 } 1045 if (!is_strong) { 1046 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1047 } 1048 if (vm_annotations) { 1049 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1050 } 1051 if (flags != STRONG_LOADER_LINK) { 1052 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1053 err_msg("invalid flag 0x%x", flags)); 1054 } 1055 } 1056 1057 1058 // Since exceptions can be thrown, class initialization can take place 1059 // if name is NULL no check for class name in .class stream has to be made. 1060 TempNewSymbol class_name = NULL; 1061 if (name != NULL) { 1062 const int str_len = (int)strlen(name); 1063 if (str_len > Symbol::max_length()) { 1064 // It's impossible to create this class; the name cannot fit 1065 // into the constant pool. 1066 Exceptions::fthrow(THREAD_AND_LOCATION, 1067 vmSymbols::java_lang_NoClassDefFoundError(), 1068 "Class name exceeds maximum length of %d: %s", 1069 Symbol::max_length(), 1070 name); 1071 return 0; 1072 } 1073 class_name = SymbolTable::new_symbol(name, str_len); 1074 } 1075 1076 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1077 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1078 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 1079 1080 Klass* defined_k; 1081 InstanceKlass* ik = NULL; 1082 if (!is_hidden) { 1083 defined_k = SystemDictionary::resolve_from_stream(class_name, 1084 class_loader, 1085 protection_domain, 1086 &st, 1087 CHECK_NULL); 1088 1089 if (log_is_enabled(Debug, class, resolve) && defined_k != NULL) { 1090 trace_class_resolution(defined_k); 1091 } 1092 ik = InstanceKlass::cast(defined_k); 1093 } else { // hidden 1094 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1095 ClassLoadInfo cl_info(protection_domain, 1096 NULL, // unsafe_anonymous_host 1097 NULL, // cp_patches 1098 host_class, 1099 classData_h, 1100 is_hidden, 1101 is_strong, 1102 vm_annotations); 1103 defined_k = SystemDictionary::parse_stream(class_name, 1104 class_loader, 1105 &st, 1106 cl_info, 1107 CHECK_NULL); 1108 if (defined_k == NULL) { 1109 THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a hidden class"); 1110 } 1111 1112 ik = InstanceKlass::cast(defined_k); 1113 1114 // The hidden class loader data has been artificially been kept alive to 1115 // this point. The mirror and any instances of this class have to keep 1116 // it alive afterwards. 1117 ik->class_loader_data()->dec_keep_alive(); 1118 1119 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1120 ModuleEntry* module = ik->module(); 1121 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1122 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1123 module_name, 1124 ik->external_name(), 1125 host_class->external_name(), 1126 ik->is_hidden() ? "is hidden" : "is not hidden"); 1127 } 1128 } 1129 assert(Reflection::is_same_class_package(lookup_k, defined_k), 1130 "lookup class and defined class are in different packages"); 1131 1132 if (init) { 1133 ik->initialize(CHECK_NULL); 1134 } else { 1135 ik->link_class(CHECK_NULL); 1136 } 1137 1138 return (jclass) JNIHandles::make_local(env, defined_k->java_mirror()); 1139 } 1140 1141 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1142 JVMWrapper("JVM_DefineClass"); 1143 1144 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 1145 JVM_END 1146 1147 /* 1148 * Define a class with the specified lookup class. 1149 * lookup: Lookup class 1150 * name: the name of the class 1151 * buf: class bytes 1152 * len: length of class bytes 1153 * pd: protection domain 1154 * init: initialize the class 1155 * flags: properties of the class 1156 * classData: private static pre-initialized field 1157 */ 1158 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1159 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1160 JVMWrapper("JVM_LookupDefineClass"); 1161 1162 if (lookup == NULL) { 1163 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1164 } 1165 1166 assert(buf != NULL, "buf must not be NULL"); 1167 1168 return jvm_lookup_define_class(env, lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1169 JVM_END 1170 1171 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1172 JVMWrapper("JVM_DefineClassWithSource"); 1173 1174 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 1175 JVM_END 1176 1177 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1178 JVMWrapper("JVM_FindLoadedClass"); 1179 ResourceMark rm(THREAD); 1180 1181 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1182 char* str = java_lang_String::as_utf8_string(h_name()); 1183 1184 // Sanity check, don't expect null 1185 if (str == NULL) return NULL; 1186 1187 // Internalize the string, converting '.' to '/' in string. 1188 char* p = (char*)str; 1189 while (*p != '\0') { 1190 if (*p == '.') { 1191 *p = '/'; 1192 } 1193 p++; 1194 } 1195 1196 const int str_len = (int)(p - str); 1197 if (str_len > Symbol::max_length()) { 1198 // It's impossible to create this class; the name cannot fit 1199 // into the constant pool. 1200 return NULL; 1201 } 1202 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1203 1204 // Security Note: 1205 // The Java level wrapper will perform the necessary security check allowing 1206 // us to pass the NULL as the initiating class loader. 1207 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1208 if (UsePerfData) { 1209 is_lock_held_by_thread(h_loader, 1210 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1211 THREAD); 1212 } 1213 1214 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1215 h_loader, 1216 Handle(), 1217 CHECK_NULL); 1218 #if INCLUDE_CDS 1219 if (k == NULL) { 1220 // If the class is not already loaded, try to see if it's in the shared 1221 // archive for the current classloader (h_loader). 1222 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1223 } 1224 #endif 1225 return (k == NULL) ? NULL : 1226 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1227 JVM_END 1228 1229 // Module support ////////////////////////////////////////////////////////////////////////////// 1230 1231 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1232 jstring location, jobjectArray packages)) 1233 JVMWrapper("JVM_DefineModule"); 1234 Modules::define_module(module, is_open, version, location, packages, CHECK); 1235 JVM_END 1236 1237 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1238 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1239 Modules::set_bootloader_unnamed_module(module, CHECK); 1240 JVM_END 1241 1242 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1243 JVMWrapper("JVM_AddModuleExports"); 1244 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1245 JVM_END 1246 1247 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1248 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1249 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1250 JVM_END 1251 1252 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1253 JVMWrapper("JVM_AddModuleExportsToAll"); 1254 Modules::add_module_exports(from_module, package, NULL, CHECK); 1255 JVM_END 1256 1257 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1258 JVMWrapper("JVM_AddReadsModule"); 1259 Modules::add_reads_module(from_module, source_module, CHECK); 1260 JVM_END 1261 1262 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1263 1264 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1265 assert (cls != NULL, "illegal class"); 1266 JVMWrapper("JVM_InitClassName"); 1267 JvmtiVMObjectAllocEventCollector oam; 1268 ResourceMark rm(THREAD); 1269 HandleMark hm(THREAD); 1270 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1271 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1272 return (jstring) JNIHandles::make_local(env, result); 1273 JVM_END 1274 1275 1276 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1277 JVMWrapper("JVM_GetClassInterfaces"); 1278 JvmtiVMObjectAllocEventCollector oam; 1279 oop mirror = JNIHandles::resolve_non_null(cls); 1280 1281 // Special handling for primitive objects 1282 if (java_lang_Class::is_primitive(mirror)) { 1283 // Primitive objects does not have any interfaces 1284 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1285 return (jobjectArray) JNIHandles::make_local(env, r); 1286 } 1287 1288 Klass* klass = java_lang_Class::as_Klass(mirror); 1289 // Figure size of result array 1290 int size; 1291 if (klass->is_instance_klass()) { 1292 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1293 } else { 1294 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1295 size = 2; 1296 } 1297 1298 // Allocate result array 1299 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1300 objArrayHandle result (THREAD, r); 1301 // Fill in result 1302 if (klass->is_instance_klass()) { 1303 // Regular instance klass, fill in all local interfaces 1304 for (int index = 0; index < size; index++) { 1305 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1306 result->obj_at_put(index, k->java_mirror()); 1307 } 1308 } else { 1309 // All arrays implement java.lang.Cloneable and java.io.Serializable 1310 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1311 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1312 } 1313 return (jobjectArray) JNIHandles::make_local(env, result()); 1314 JVM_END 1315 1316 1317 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1318 JVMWrapper("JVM_IsInterface"); 1319 oop mirror = JNIHandles::resolve_non_null(cls); 1320 if (java_lang_Class::is_primitive(mirror)) { 1321 return JNI_FALSE; 1322 } 1323 Klass* k = java_lang_Class::as_Klass(mirror); 1324 jboolean result = k->is_interface(); 1325 assert(!result || k->is_instance_klass(), 1326 "all interfaces are instance types"); 1327 // The compiler intrinsic for isInterface tests the 1328 // Klass::_access_flags bits in the same way. 1329 return result; 1330 JVM_END 1331 1332 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1333 JVMWrapper("JVM_IsHiddenClass"); 1334 oop mirror = JNIHandles::resolve_non_null(cls); 1335 if (java_lang_Class::is_primitive(mirror)) { 1336 return JNI_FALSE; 1337 } 1338 Klass* k = java_lang_Class::as_Klass(mirror); 1339 return k->is_hidden(); 1340 JVM_END 1341 1342 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1343 JVMWrapper("JVM_GetClassSigners"); 1344 JvmtiVMObjectAllocEventCollector oam; 1345 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1346 // There are no signers for primitive types 1347 return NULL; 1348 } 1349 1350 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls))); 1351 1352 // If there are no signers set in the class, or if the class 1353 // is an array, return NULL. 1354 if (signers == NULL) return NULL; 1355 1356 // copy of the signers array 1357 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1358 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1359 for (int index = 0; index < signers->length(); index++) { 1360 signers_copy->obj_at_put(index, signers->obj_at(index)); 1361 } 1362 1363 // return the copy 1364 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1365 JVM_END 1366 1367 1368 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1369 JVMWrapper("JVM_SetClassSigners"); 1370 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1371 // This call is ignored for primitive types and arrays. 1372 // Signers are only set once, ClassLoader.java, and thus shouldn't 1373 // be called with an array. Only the bootstrap loader creates arrays. 1374 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1375 if (k->is_instance_klass()) { 1376 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1377 } 1378 } 1379 JVM_END 1380 1381 1382 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1383 JVMWrapper("JVM_GetProtectionDomain"); 1384 if (JNIHandles::resolve(cls) == NULL) { 1385 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1386 } 1387 1388 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1389 // Primitive types does not have a protection domain. 1390 return NULL; 1391 } 1392 1393 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1394 return (jobject) JNIHandles::make_local(env, pd); 1395 JVM_END 1396 1397 1398 // Returns the inherited_access_control_context field of the running thread. 1399 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1400 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1401 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1402 return JNIHandles::make_local(env, result); 1403 JVM_END 1404 1405 class RegisterArrayForGC { 1406 private: 1407 JavaThread *_thread; 1408 public: 1409 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1410 _thread = thread; 1411 _thread->register_array_for_gc(array); 1412 } 1413 1414 ~RegisterArrayForGC() { 1415 _thread->register_array_for_gc(NULL); 1416 } 1417 }; 1418 1419 1420 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1421 JVMWrapper("JVM_GetStackAccessControlContext"); 1422 if (!UsePrivilegedStack) return NULL; 1423 1424 ResourceMark rm(THREAD); 1425 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1426 JvmtiVMObjectAllocEventCollector oam; 1427 1428 // count the protection domains on the execution stack. We collapse 1429 // duplicate consecutive protection domains into a single one, as 1430 // well as stopping when we hit a privileged frame. 1431 1432 oop previous_protection_domain = NULL; 1433 Handle privileged_context(thread, NULL); 1434 bool is_privileged = false; 1435 oop protection_domain = NULL; 1436 1437 // Iterate through Java frames 1438 vframeStream vfst(thread); 1439 for(; !vfst.at_end(); vfst.next()) { 1440 // get method of frame 1441 Method* method = vfst.method(); 1442 1443 // stop at the first privileged frame 1444 if (method->method_holder() == SystemDictionary::AccessController_klass() && 1445 method->name() == vmSymbols::executePrivileged_name()) 1446 { 1447 // this frame is privileged 1448 is_privileged = true; 1449 1450 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1451 1452 StackValueCollection* locals = priv->locals(); 1453 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1454 StackValue* clr_sv = locals->at(2); // Class<?> caller 1455 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1456 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1457 privileged_context = ctx_sv->get_obj(); 1458 Handle caller = clr_sv->get_obj(); 1459 1460 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1461 protection_domain = caller_klass->protection_domain(); 1462 } else { 1463 protection_domain = method->method_holder()->protection_domain(); 1464 } 1465 1466 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1467 local_array->push(protection_domain); 1468 previous_protection_domain = protection_domain; 1469 } 1470 1471 if (is_privileged) break; 1472 } 1473 1474 1475 // either all the domains on the stack were system domains, or 1476 // we had a privileged system domain 1477 if (local_array->is_empty()) { 1478 if (is_privileged && privileged_context.is_null()) return NULL; 1479 1480 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1481 return JNIHandles::make_local(env, result); 1482 } 1483 1484 // the resource area must be registered in case of a gc 1485 RegisterArrayForGC ragc(thread, local_array); 1486 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1487 local_array->length(), CHECK_NULL); 1488 objArrayHandle h_context(thread, context); 1489 for (int index = 0; index < local_array->length(); index++) { 1490 h_context->obj_at_put(index, local_array->at(index)); 1491 } 1492 1493 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1494 1495 return JNIHandles::make_local(env, result); 1496 JVM_END 1497 1498 1499 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1500 JVMWrapper("JVM_IsArrayClass"); 1501 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1502 return (k != NULL) && k->is_array_klass() ? true : false; 1503 JVM_END 1504 1505 1506 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1507 JVMWrapper("JVM_IsPrimitiveClass"); 1508 oop mirror = JNIHandles::resolve_non_null(cls); 1509 return (jboolean) java_lang_Class::is_primitive(mirror); 1510 JVM_END 1511 1512 1513 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1514 JVMWrapper("JVM_GetClassModifiers"); 1515 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1516 // Primitive type 1517 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1518 } 1519 1520 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1521 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1522 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1523 return k->modifier_flags(); 1524 JVM_END 1525 1526 1527 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1528 1529 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1530 JvmtiVMObjectAllocEventCollector oam; 1531 // ofClass is a reference to a java_lang_Class object. The mirror object 1532 // of an InstanceKlass 1533 1534 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1535 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1536 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1537 return (jobjectArray)JNIHandles::make_local(env, result); 1538 } 1539 1540 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1541 InnerClassesIterator iter(k); 1542 1543 if (iter.length() == 0) { 1544 // Neither an inner nor outer class 1545 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1546 return (jobjectArray)JNIHandles::make_local(env, result); 1547 } 1548 1549 // find inner class info 1550 constantPoolHandle cp(thread, k->constants()); 1551 int length = iter.length(); 1552 1553 // Allocate temp. result array 1554 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1555 objArrayHandle result (THREAD, r); 1556 int members = 0; 1557 1558 for (; !iter.done(); iter.next()) { 1559 int ioff = iter.inner_class_info_index(); 1560 int ooff = iter.outer_class_info_index(); 1561 1562 if (ioff != 0 && ooff != 0) { 1563 // Check to see if the name matches the class we're looking for 1564 // before attempting to find the class. 1565 if (cp->klass_name_at_matches(k, ooff)) { 1566 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1567 if (outer_klass == k) { 1568 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1569 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1570 1571 // Throws an exception if outer klass has not declared k as 1572 // an inner klass 1573 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1574 1575 result->obj_at_put(members, inner_klass->java_mirror()); 1576 members++; 1577 } 1578 } 1579 } 1580 } 1581 1582 if (members != length) { 1583 // Return array of right length 1584 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1585 for(int i = 0; i < members; i++) { 1586 res->obj_at_put(i, result->obj_at(i)); 1587 } 1588 return (jobjectArray)JNIHandles::make_local(env, res); 1589 } 1590 1591 return (jobjectArray)JNIHandles::make_local(env, result()); 1592 JVM_END 1593 1594 1595 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1596 { 1597 // ofClass is a reference to a java_lang_Class object. 1598 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1599 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1600 return NULL; 1601 } 1602 1603 bool inner_is_member = false; 1604 Klass* outer_klass 1605 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1606 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1607 if (outer_klass == NULL) return NULL; // already a top-level class 1608 if (!inner_is_member) return NULL; // a hidden or unsafe anonymous class (inside a method) 1609 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1610 } 1611 JVM_END 1612 1613 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1614 { 1615 oop mirror = JNIHandles::resolve_non_null(cls); 1616 if (java_lang_Class::is_primitive(mirror) || 1617 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1618 return NULL; 1619 } 1620 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1621 int ooff = 0, noff = 0; 1622 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1623 if (noff != 0) { 1624 constantPoolHandle i_cp(thread, k->constants()); 1625 Symbol* name = i_cp->symbol_at(noff); 1626 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1627 return (jstring) JNIHandles::make_local(env, str()); 1628 } 1629 } 1630 return NULL; 1631 } 1632 JVM_END 1633 1634 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1635 assert (cls != NULL, "illegal class"); 1636 JVMWrapper("JVM_GetClassSignature"); 1637 JvmtiVMObjectAllocEventCollector oam; 1638 ResourceMark rm(THREAD); 1639 // Return null for arrays and primatives 1640 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1641 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1642 if (k->is_instance_klass()) { 1643 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1644 if (sym == NULL) return NULL; 1645 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1646 return (jstring) JNIHandles::make_local(env, str()); 1647 } 1648 } 1649 return NULL; 1650 JVM_END 1651 1652 1653 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1654 assert (cls != NULL, "illegal class"); 1655 JVMWrapper("JVM_GetClassAnnotations"); 1656 1657 // Return null for arrays and primitives 1658 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1659 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1660 if (k->is_instance_klass()) { 1661 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1662 return (jbyteArray) JNIHandles::make_local(env, a); 1663 } 1664 } 1665 return NULL; 1666 JVM_END 1667 1668 1669 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1670 // some of this code was adapted from from jni_FromReflectedField 1671 1672 oop reflected = JNIHandles::resolve_non_null(field); 1673 oop mirror = java_lang_reflect_Field::clazz(reflected); 1674 Klass* k = java_lang_Class::as_Klass(mirror); 1675 int slot = java_lang_reflect_Field::slot(reflected); 1676 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1677 1678 InstanceKlass* ik = InstanceKlass::cast(k); 1679 intptr_t offset = ik->field_offset(slot); 1680 1681 if (modifiers & JVM_ACC_STATIC) { 1682 // for static fields we only look in the current class 1683 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1684 assert(false, "cannot find static field"); 1685 return false; 1686 } 1687 } else { 1688 // for instance fields we start with the current class and work 1689 // our way up through the superclass chain 1690 if (!ik->find_field_from_offset(offset, false, &fd)) { 1691 assert(false, "cannot find instance field"); 1692 return false; 1693 } 1694 } 1695 return true; 1696 } 1697 1698 static Method* jvm_get_method_common(jobject method) { 1699 // some of this code was adapted from from jni_FromReflectedMethod 1700 1701 oop reflected = JNIHandles::resolve_non_null(method); 1702 oop mirror = NULL; 1703 int slot = 0; 1704 1705 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1706 mirror = java_lang_reflect_Constructor::clazz(reflected); 1707 slot = java_lang_reflect_Constructor::slot(reflected); 1708 } else { 1709 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1710 "wrong type"); 1711 mirror = java_lang_reflect_Method::clazz(reflected); 1712 slot = java_lang_reflect_Method::slot(reflected); 1713 } 1714 Klass* k = java_lang_Class::as_Klass(mirror); 1715 1716 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1717 assert(m != NULL, "cannot find method"); 1718 return m; // caller has to deal with NULL in product mode 1719 } 1720 1721 /* Type use annotations support (JDK 1.8) */ 1722 1723 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1724 assert (cls != NULL, "illegal class"); 1725 JVMWrapper("JVM_GetClassTypeAnnotations"); 1726 ResourceMark rm(THREAD); 1727 // Return null for arrays and primitives 1728 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1729 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1730 if (k->is_instance_klass()) { 1731 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1732 if (type_annotations != NULL) { 1733 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1734 return (jbyteArray) JNIHandles::make_local(env, a); 1735 } 1736 } 1737 } 1738 return NULL; 1739 JVM_END 1740 1741 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1742 assert (method != NULL, "illegal method"); 1743 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1744 1745 // method is a handle to a java.lang.reflect.Method object 1746 Method* m = jvm_get_method_common(method); 1747 if (m == NULL) { 1748 return NULL; 1749 } 1750 1751 AnnotationArray* type_annotations = m->type_annotations(); 1752 if (type_annotations != NULL) { 1753 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1754 return (jbyteArray) JNIHandles::make_local(env, a); 1755 } 1756 1757 return NULL; 1758 JVM_END 1759 1760 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1761 assert (field != NULL, "illegal field"); 1762 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1763 1764 fieldDescriptor fd; 1765 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1766 if (!gotFd) { 1767 return NULL; 1768 } 1769 1770 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1771 JVM_END 1772 1773 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1774 if (!cp->is_within_bounds(index)) { 1775 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1776 } 1777 } 1778 1779 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1780 { 1781 JVMWrapper("JVM_GetMethodParameters"); 1782 // method is a handle to a java.lang.reflect.Method object 1783 Method* method_ptr = jvm_get_method_common(method); 1784 methodHandle mh (THREAD, method_ptr); 1785 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1786 const int num_params = mh->method_parameters_length(); 1787 1788 if (num_params < 0) { 1789 // A -1 return value from method_parameters_length means there is no 1790 // parameter data. Return null to indicate this to the reflection 1791 // API. 1792 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1793 return (jobjectArray)NULL; 1794 } else { 1795 // Otherwise, we return something up to reflection, even if it is 1796 // a zero-length array. Why? Because in some cases this can 1797 // trigger a MalformedParametersException. 1798 1799 // make sure all the symbols are properly formatted 1800 for (int i = 0; i < num_params; i++) { 1801 MethodParametersElement* params = mh->method_parameters_start(); 1802 int index = params[i].name_cp_index; 1803 constantPoolHandle cp(THREAD, mh->constants()); 1804 bounds_check(cp, index, CHECK_NULL); 1805 1806 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1807 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1808 "Wrong type at constant pool index"); 1809 } 1810 1811 } 1812 1813 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1814 objArrayHandle result (THREAD, result_oop); 1815 1816 for (int i = 0; i < num_params; i++) { 1817 MethodParametersElement* params = mh->method_parameters_start(); 1818 // For a 0 index, give a NULL symbol 1819 Symbol* sym = 0 != params[i].name_cp_index ? 1820 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1821 int flags = params[i].flags; 1822 oop param = Reflection::new_parameter(reflected_method, i, sym, 1823 flags, CHECK_NULL); 1824 result->obj_at_put(i, param); 1825 } 1826 return (jobjectArray)JNIHandles::make_local(env, result()); 1827 } 1828 } 1829 JVM_END 1830 1831 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1832 1833 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1834 { 1835 JVMWrapper("JVM_GetClassDeclaredFields"); 1836 JvmtiVMObjectAllocEventCollector oam; 1837 1838 // Exclude primitive types and array types 1839 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1840 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1841 // Return empty array 1842 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1843 return (jobjectArray) JNIHandles::make_local(env, res); 1844 } 1845 1846 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1847 constantPoolHandle cp(THREAD, k->constants()); 1848 1849 // Ensure class is linked 1850 k->link_class(CHECK_NULL); 1851 1852 // Allocate result 1853 int num_fields; 1854 1855 if (publicOnly) { 1856 num_fields = 0; 1857 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1858 if (fs.access_flags().is_public()) ++num_fields; 1859 } 1860 } else { 1861 num_fields = k->java_fields_count(); 1862 } 1863 1864 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1865 objArrayHandle result (THREAD, r); 1866 1867 int out_idx = 0; 1868 fieldDescriptor fd; 1869 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1870 if (!publicOnly || fs.access_flags().is_public()) { 1871 fd.reinitialize(k, fs.index()); 1872 oop field = Reflection::new_field(&fd, CHECK_NULL); 1873 result->obj_at_put(out_idx, field); 1874 ++out_idx; 1875 } 1876 } 1877 assert(out_idx == num_fields, "just checking"); 1878 return (jobjectArray) JNIHandles::make_local(env, result()); 1879 } 1880 JVM_END 1881 1882 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1883 { 1884 JVMWrapper("JVM_IsRecord"); 1885 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1886 if (k != NULL && k->is_instance_klass()) { 1887 InstanceKlass* ik = InstanceKlass::cast(k); 1888 return ik->is_record(); 1889 } else { 1890 return false; 1891 } 1892 } 1893 JVM_END 1894 1895 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1896 { 1897 JVMWrapper("JVM_GetRecordComponents"); 1898 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1899 assert(c->is_instance_klass(), "must be"); 1900 InstanceKlass* ik = InstanceKlass::cast(c); 1901 1902 if (ik->is_record()) { 1903 Array<RecordComponent*>* components = ik->record_components(); 1904 assert(components != NULL, "components should not be NULL"); 1905 { 1906 JvmtiVMObjectAllocEventCollector oam; 1907 constantPoolHandle cp(THREAD, ik->constants()); 1908 int length = components->length(); 1909 assert(length >= 0, "unexpected record_components length"); 1910 objArrayOop record_components = 1911 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL); 1912 objArrayHandle components_h (THREAD, record_components); 1913 1914 for (int x = 0; x < length; x++) { 1915 RecordComponent* component = components->at(x); 1916 assert(component != NULL, "unexpected NULL record component"); 1917 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1918 components_h->obj_at_put(x, component_oop); 1919 } 1920 return (jobjectArray)JNIHandles::make_local(components_h()); 1921 } 1922 } 1923 1924 // Return empty array if ofClass is not a record. 1925 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL); 1926 return (jobjectArray)JNIHandles::make_local(env, result); 1927 } 1928 JVM_END 1929 1930 static bool select_method(const methodHandle& method, bool want_constructor) { 1931 if (want_constructor) { 1932 return (method->is_initializer() && !method->is_static()); 1933 } else { 1934 return (!method->is_initializer() && !method->is_overpass()); 1935 } 1936 } 1937 1938 static jobjectArray get_class_declared_methods_helper( 1939 JNIEnv *env, 1940 jclass ofClass, jboolean publicOnly, 1941 bool want_constructor, 1942 Klass* klass, TRAPS) { 1943 1944 JvmtiVMObjectAllocEventCollector oam; 1945 1946 // Exclude primitive types and array types 1947 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1948 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1949 // Return empty array 1950 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1951 return (jobjectArray) JNIHandles::make_local(env, res); 1952 } 1953 1954 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1955 1956 // Ensure class is linked 1957 k->link_class(CHECK_NULL); 1958 1959 Array<Method*>* methods = k->methods(); 1960 int methods_length = methods->length(); 1961 1962 // Save original method_idnum in case of redefinition, which can change 1963 // the idnum of obsolete methods. The new method will have the same idnum 1964 // but if we refresh the methods array, the counts will be wrong. 1965 ResourceMark rm(THREAD); 1966 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1967 int num_methods = 0; 1968 1969 for (int i = 0; i < methods_length; i++) { 1970 methodHandle method(THREAD, methods->at(i)); 1971 if (select_method(method, want_constructor)) { 1972 if (!publicOnly || method->is_public()) { 1973 idnums->push(method->method_idnum()); 1974 ++num_methods; 1975 } 1976 } 1977 } 1978 1979 // Allocate result 1980 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1981 objArrayHandle result (THREAD, r); 1982 1983 // Now just put the methods that we selected above, but go by their idnum 1984 // in case of redefinition. The methods can be redefined at any safepoint, 1985 // so above when allocating the oop array and below when creating reflect 1986 // objects. 1987 for (int i = 0; i < num_methods; i++) { 1988 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1989 if (method.is_null()) { 1990 // Method may have been deleted and seems this API can handle null 1991 // Otherwise should probably put a method that throws NSME 1992 result->obj_at_put(i, NULL); 1993 } else { 1994 oop m; 1995 if (want_constructor) { 1996 m = Reflection::new_constructor(method, CHECK_NULL); 1997 } else { 1998 m = Reflection::new_method(method, false, CHECK_NULL); 1999 } 2000 result->obj_at_put(i, m); 2001 } 2002 } 2003 2004 return (jobjectArray) JNIHandles::make_local(env, result()); 2005 } 2006 2007 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 2008 { 2009 JVMWrapper("JVM_GetClassDeclaredMethods"); 2010 return get_class_declared_methods_helper(env, ofClass, publicOnly, 2011 /*want_constructor*/ false, 2012 SystemDictionary::reflect_Method_klass(), THREAD); 2013 } 2014 JVM_END 2015 2016 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 2017 { 2018 JVMWrapper("JVM_GetClassDeclaredConstructors"); 2019 return get_class_declared_methods_helper(env, ofClass, publicOnly, 2020 /*want_constructor*/ true, 2021 SystemDictionary::reflect_Constructor_klass(), THREAD); 2022 } 2023 JVM_END 2024 2025 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 2026 { 2027 JVMWrapper("JVM_GetClassAccessFlags"); 2028 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 2029 // Primitive type 2030 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 2031 } 2032 2033 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2034 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 2035 } 2036 JVM_END 2037 2038 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 2039 { 2040 JVMWrapper("JVM_AreNestMates"); 2041 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2042 assert(c->is_instance_klass(), "must be"); 2043 InstanceKlass* ck = InstanceKlass::cast(c); 2044 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 2045 assert(m->is_instance_klass(), "must be"); 2046 InstanceKlass* mk = InstanceKlass::cast(m); 2047 return ck->has_nestmate_access_to(mk, THREAD); 2048 } 2049 JVM_END 2050 2051 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 2052 { 2053 // current is not a primitive or array class 2054 JVMWrapper("JVM_GetNestHost"); 2055 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2056 assert(c->is_instance_klass(), "must be"); 2057 InstanceKlass* ck = InstanceKlass::cast(c); 2058 InstanceKlass* host = ck->nest_host(THREAD); 2059 return (jclass) (host == NULL ? NULL : 2060 JNIHandles::make_local(THREAD, host->java_mirror())); 2061 } 2062 JVM_END 2063 2064 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 2065 { 2066 // current is not a primitive or array class 2067 JVMWrapper("JVM_GetNestMembers"); 2068 ResourceMark rm(THREAD); 2069 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2070 assert(c->is_instance_klass(), "must be"); 2071 InstanceKlass* ck = InstanceKlass::cast(c); 2072 InstanceKlass* host = ck->nest_host(THREAD); 2073 2074 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 2075 ck->external_name(), host->external_name()); 2076 { 2077 JvmtiVMObjectAllocEventCollector oam; 2078 Array<u2>* members = host->nest_members(); 2079 int length = members == NULL ? 0 : members->length(); 2080 2081 log_trace(class, nestmates)(" - host has %d listed nest members", length); 2082 2083 // nest host is first in the array so make it one bigger 2084 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 2085 length + 1, CHECK_NULL); 2086 objArrayHandle result(THREAD, r); 2087 result->obj_at_put(0, host->java_mirror()); 2088 if (length != 0) { 2089 int count = 0; 2090 for (int i = 0; i < length; i++) { 2091 int cp_index = members->at(i); 2092 Klass* k = host->constants()->klass_at(cp_index, THREAD); 2093 if (HAS_PENDING_EXCEPTION) { 2094 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) { 2095 return NULL; // propagate VMEs 2096 } 2097 if (log_is_enabled(Trace, class, nestmates)) { 2098 stringStream ss; 2099 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2100 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2101 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2102 log_trace(class, nestmates)("%s", ss.as_string()); 2103 } 2104 CLEAR_PENDING_EXCEPTION; 2105 continue; 2106 } 2107 if (k->is_instance_klass()) { 2108 InstanceKlass* ik = InstanceKlass::cast(k); 2109 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2110 if (nest_host_k == host) { 2111 result->obj_at_put(count+1, k->java_mirror()); 2112 count++; 2113 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2114 } else { 2115 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2116 ik->external_name(), nest_host_k->external_name()); 2117 } 2118 } else { 2119 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2120 k->external_name()); 2121 } 2122 } 2123 if (count < length) { 2124 // we had invalid entries so we need to compact the array 2125 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2126 length + 1, count + 1); 2127 2128 objArrayOop r2 = oopFactory::new_objArray(SystemDictionary::Class_klass(), 2129 count + 1, CHECK_NULL); 2130 objArrayHandle result2(THREAD, r2); 2131 for (int i = 0; i < count + 1; i++) { 2132 result2->obj_at_put(i, result->obj_at(i)); 2133 } 2134 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2135 } 2136 } 2137 else { 2138 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate"); 2139 } 2140 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2141 } 2142 } 2143 JVM_END 2144 2145 // Constant pool access ////////////////////////////////////////////////////////// 2146 2147 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2148 { 2149 JVMWrapper("JVM_GetClassConstantPool"); 2150 JvmtiVMObjectAllocEventCollector oam; 2151 2152 // Return null for primitives and arrays 2153 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 2154 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2155 if (k->is_instance_klass()) { 2156 InstanceKlass* k_h = InstanceKlass::cast(k); 2157 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2158 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2159 return JNIHandles::make_local(jcp()); 2160 } 2161 } 2162 return NULL; 2163 } 2164 JVM_END 2165 2166 2167 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2168 { 2169 JVMWrapper("JVM_ConstantPoolGetSize"); 2170 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2171 return cp->length(); 2172 } 2173 JVM_END 2174 2175 2176 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2177 { 2178 JVMWrapper("JVM_ConstantPoolGetClassAt"); 2179 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2180 bounds_check(cp, index, CHECK_NULL); 2181 constantTag tag = cp->tag_at(index); 2182 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2183 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2184 } 2185 Klass* k = cp->klass_at(index, CHECK_NULL); 2186 return (jclass) JNIHandles::make_local(k->java_mirror()); 2187 } 2188 JVM_END 2189 2190 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2191 { 2192 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 2193 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2194 bounds_check(cp, index, CHECK_NULL); 2195 constantTag tag = cp->tag_at(index); 2196 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2197 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2198 } 2199 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2200 if (k == NULL) return NULL; 2201 return (jclass) JNIHandles::make_local(k->java_mirror()); 2202 } 2203 JVM_END 2204 2205 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2206 constantTag tag = cp->tag_at(index); 2207 if (!tag.is_method() && !tag.is_interface_method()) { 2208 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2209 } 2210 int klass_ref = cp->uncached_klass_ref_index_at(index); 2211 Klass* k_o; 2212 if (force_resolution) { 2213 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2214 } else { 2215 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2216 if (k_o == NULL) return NULL; 2217 } 2218 InstanceKlass* k = InstanceKlass::cast(k_o); 2219 Symbol* name = cp->uncached_name_ref_at(index); 2220 Symbol* sig = cp->uncached_signature_ref_at(index); 2221 methodHandle m (THREAD, k->find_method(name, sig)); 2222 if (m.is_null()) { 2223 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2224 } 2225 oop method; 2226 if (!m->is_initializer() || m->is_static()) { 2227 method = Reflection::new_method(m, true, CHECK_NULL); 2228 } else { 2229 method = Reflection::new_constructor(m, CHECK_NULL); 2230 } 2231 return JNIHandles::make_local(method); 2232 } 2233 2234 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2235 { 2236 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 2237 JvmtiVMObjectAllocEventCollector oam; 2238 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2239 bounds_check(cp, index, CHECK_NULL); 2240 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2241 return res; 2242 } 2243 JVM_END 2244 2245 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2246 { 2247 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2248 JvmtiVMObjectAllocEventCollector oam; 2249 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2250 bounds_check(cp, index, CHECK_NULL); 2251 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2252 return res; 2253 } 2254 JVM_END 2255 2256 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2257 constantTag tag = cp->tag_at(index); 2258 if (!tag.is_field()) { 2259 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2260 } 2261 int klass_ref = cp->uncached_klass_ref_index_at(index); 2262 Klass* k_o; 2263 if (force_resolution) { 2264 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2265 } else { 2266 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2267 if (k_o == NULL) return NULL; 2268 } 2269 InstanceKlass* k = InstanceKlass::cast(k_o); 2270 Symbol* name = cp->uncached_name_ref_at(index); 2271 Symbol* sig = cp->uncached_signature_ref_at(index); 2272 fieldDescriptor fd; 2273 Klass* target_klass = k->find_field(name, sig, &fd); 2274 if (target_klass == NULL) { 2275 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2276 } 2277 oop field = Reflection::new_field(&fd, CHECK_NULL); 2278 return JNIHandles::make_local(field); 2279 } 2280 2281 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2282 { 2283 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2284 JvmtiVMObjectAllocEventCollector oam; 2285 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2286 bounds_check(cp, index, CHECK_NULL); 2287 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2288 return res; 2289 } 2290 JVM_END 2291 2292 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2293 { 2294 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2295 JvmtiVMObjectAllocEventCollector oam; 2296 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2297 bounds_check(cp, index, CHECK_NULL); 2298 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2299 return res; 2300 } 2301 JVM_END 2302 2303 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2304 { 2305 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2306 JvmtiVMObjectAllocEventCollector oam; 2307 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2308 bounds_check(cp, index, CHECK_NULL); 2309 constantTag tag = cp->tag_at(index); 2310 if (!tag.is_field_or_method()) { 2311 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2312 } 2313 int klass_ref = cp->uncached_klass_ref_index_at(index); 2314 Symbol* klass_name = cp->klass_name_at(klass_ref); 2315 Symbol* member_name = cp->uncached_name_ref_at(index); 2316 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2317 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2318 objArrayHandle dest(THREAD, dest_o); 2319 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2320 dest->obj_at_put(0, str()); 2321 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2322 dest->obj_at_put(1, str()); 2323 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2324 dest->obj_at_put(2, str()); 2325 return (jobjectArray) JNIHandles::make_local(dest()); 2326 } 2327 JVM_END 2328 2329 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2330 { 2331 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2332 JvmtiVMObjectAllocEventCollector oam; 2333 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2334 bounds_check(cp, index, CHECK_0); 2335 constantTag tag = cp->tag_at(index); 2336 if (!tag.is_field_or_method()) { 2337 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2338 } 2339 return (jint) cp->uncached_klass_ref_index_at(index); 2340 } 2341 JVM_END 2342 2343 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2344 { 2345 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2346 JvmtiVMObjectAllocEventCollector oam; 2347 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2348 bounds_check(cp, index, CHECK_0); 2349 constantTag tag = cp->tag_at(index); 2350 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2351 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2352 } 2353 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2354 } 2355 JVM_END 2356 2357 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2358 { 2359 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2360 JvmtiVMObjectAllocEventCollector oam; 2361 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2362 bounds_check(cp, index, CHECK_NULL); 2363 constantTag tag = cp->tag_at(index); 2364 if (!tag.is_name_and_type()) { 2365 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2366 } 2367 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2368 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2369 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2370 objArrayHandle dest(THREAD, dest_o); 2371 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2372 dest->obj_at_put(0, str()); 2373 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2374 dest->obj_at_put(1, str()); 2375 return (jobjectArray) JNIHandles::make_local(dest()); 2376 } 2377 JVM_END 2378 2379 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2380 { 2381 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2382 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2383 bounds_check(cp, index, CHECK_0); 2384 constantTag tag = cp->tag_at(index); 2385 if (!tag.is_int()) { 2386 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2387 } 2388 return cp->int_at(index); 2389 } 2390 JVM_END 2391 2392 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2393 { 2394 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2395 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2396 bounds_check(cp, index, CHECK_(0L)); 2397 constantTag tag = cp->tag_at(index); 2398 if (!tag.is_long()) { 2399 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2400 } 2401 return cp->long_at(index); 2402 } 2403 JVM_END 2404 2405 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2406 { 2407 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2408 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2409 bounds_check(cp, index, CHECK_(0.0f)); 2410 constantTag tag = cp->tag_at(index); 2411 if (!tag.is_float()) { 2412 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2413 } 2414 return cp->float_at(index); 2415 } 2416 JVM_END 2417 2418 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2419 { 2420 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2421 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2422 bounds_check(cp, index, CHECK_(0.0)); 2423 constantTag tag = cp->tag_at(index); 2424 if (!tag.is_double()) { 2425 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2426 } 2427 return cp->double_at(index); 2428 } 2429 JVM_END 2430 2431 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2432 { 2433 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2434 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2435 bounds_check(cp, index, CHECK_NULL); 2436 constantTag tag = cp->tag_at(index); 2437 if (!tag.is_string()) { 2438 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2439 } 2440 oop str = cp->string_at(index, CHECK_NULL); 2441 return (jstring) JNIHandles::make_local(str); 2442 } 2443 JVM_END 2444 2445 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2446 { 2447 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2448 JvmtiVMObjectAllocEventCollector oam; 2449 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2450 bounds_check(cp, index, CHECK_NULL); 2451 constantTag tag = cp->tag_at(index); 2452 if (!tag.is_symbol()) { 2453 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2454 } 2455 Symbol* sym = cp->symbol_at(index); 2456 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2457 return (jstring) JNIHandles::make_local(str()); 2458 } 2459 JVM_END 2460 2461 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2462 { 2463 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2464 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2465 bounds_check(cp, index, CHECK_0); 2466 constantTag tag = cp->tag_at(index); 2467 jbyte result = tag.value(); 2468 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2469 // they are changed to the corresponding tags from the JVM spec, so that java code in 2470 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2471 if (tag.is_klass_or_reference()) { 2472 result = JVM_CONSTANT_Class; 2473 } else if (tag.is_string_index()) { 2474 result = JVM_CONSTANT_String; 2475 } else if (tag.is_method_type_in_error()) { 2476 result = JVM_CONSTANT_MethodType; 2477 } else if (tag.is_method_handle_in_error()) { 2478 result = JVM_CONSTANT_MethodHandle; 2479 } else if (tag.is_dynamic_constant_in_error()) { 2480 result = JVM_CONSTANT_Dynamic; 2481 } 2482 return result; 2483 } 2484 JVM_END 2485 2486 // Assertion support. ////////////////////////////////////////////////////////// 2487 2488 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2489 JVMWrapper("JVM_DesiredAssertionStatus"); 2490 assert(cls != NULL, "bad class"); 2491 2492 oop r = JNIHandles::resolve(cls); 2493 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2494 if (java_lang_Class::is_primitive(r)) return false; 2495 2496 Klass* k = java_lang_Class::as_Klass(r); 2497 assert(k->is_instance_klass(), "must be an instance klass"); 2498 if (!k->is_instance_klass()) return false; 2499 2500 ResourceMark rm(THREAD); 2501 const char* name = k->name()->as_C_string(); 2502 bool system_class = k->class_loader() == NULL; 2503 return JavaAssertions::enabled(name, system_class); 2504 2505 JVM_END 2506 2507 2508 // Return a new AssertionStatusDirectives object with the fields filled in with 2509 // command-line assertion arguments (i.e., -ea, -da). 2510 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2511 JVMWrapper("JVM_AssertionStatusDirectives"); 2512 JvmtiVMObjectAllocEventCollector oam; 2513 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2514 return JNIHandles::make_local(env, asd); 2515 JVM_END 2516 2517 // Verification //////////////////////////////////////////////////////////////////////////////// 2518 2519 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2520 2521 // RedefineClasses support: bug 6214132 caused verification to fail. 2522 // All functions from this section should call the jvmtiThreadSate function: 2523 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2524 // The function returns a Klass* of the _scratch_class if the verifier 2525 // was invoked in the middle of the class redefinition. 2526 // Otherwise it returns its argument value which is the _the_class Klass*. 2527 // Please, refer to the description in the jvmtiThreadSate.hpp. 2528 2529 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2530 JVMWrapper("JVM_GetClassNameUTF"); 2531 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2532 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2533 return k->name()->as_utf8(); 2534 JVM_END 2535 2536 2537 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2538 JVMWrapper("JVM_GetClassCPTypes"); 2539 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2540 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2541 // types will have length zero if this is not an InstanceKlass 2542 // (length is determined by call to JVM_GetClassCPEntriesCount) 2543 if (k->is_instance_klass()) { 2544 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2545 for (int index = cp->length() - 1; index >= 0; index--) { 2546 constantTag tag = cp->tag_at(index); 2547 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2548 } 2549 } 2550 JVM_END 2551 2552 2553 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2554 JVMWrapper("JVM_GetClassCPEntriesCount"); 2555 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2556 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2557 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2558 JVM_END 2559 2560 2561 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2562 JVMWrapper("JVM_GetClassFieldsCount"); 2563 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2564 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2565 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2566 JVM_END 2567 2568 2569 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2570 JVMWrapper("JVM_GetClassMethodsCount"); 2571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2572 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2573 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2574 JVM_END 2575 2576 2577 // The following methods, used for the verifier, are never called with 2578 // array klasses, so a direct cast to InstanceKlass is safe. 2579 // Typically, these methods are called in a loop with bounds determined 2580 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2581 // zero for arrays. 2582 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2583 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2584 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2585 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2586 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2587 int length = method->checked_exceptions_length(); 2588 if (length > 0) { 2589 CheckedExceptionElement* table= method->checked_exceptions_start(); 2590 for (int i = 0; i < length; i++) { 2591 exceptions[i] = table[i].class_cp_index; 2592 } 2593 } 2594 JVM_END 2595 2596 2597 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2598 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2599 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2600 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2601 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2602 return method->checked_exceptions_length(); 2603 JVM_END 2604 2605 2606 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2607 JVMWrapper("JVM_GetMethodIxByteCode"); 2608 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2609 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2610 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2611 memcpy(code, method->code_base(), method->code_size()); 2612 JVM_END 2613 2614 2615 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2616 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2617 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2618 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2619 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2620 return method->code_size(); 2621 JVM_END 2622 2623 2624 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2625 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2626 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2627 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2628 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2629 ExceptionTable extable(method); 2630 entry->start_pc = extable.start_pc(entry_index); 2631 entry->end_pc = extable.end_pc(entry_index); 2632 entry->handler_pc = extable.handler_pc(entry_index); 2633 entry->catchType = extable.catch_type_index(entry_index); 2634 JVM_END 2635 2636 2637 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2638 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2639 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2640 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2641 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2642 return method->exception_table_length(); 2643 JVM_END 2644 2645 2646 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2647 JVMWrapper("JVM_GetMethodIxModifiers"); 2648 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2649 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2650 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2651 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2652 JVM_END 2653 2654 2655 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2656 JVMWrapper("JVM_GetFieldIxModifiers"); 2657 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2658 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2659 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2660 JVM_END 2661 2662 2663 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2664 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2665 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2666 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2667 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2668 return method->max_locals(); 2669 JVM_END 2670 2671 2672 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2673 JVMWrapper("JVM_GetMethodIxArgsSize"); 2674 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2675 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2676 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2677 return method->size_of_parameters(); 2678 JVM_END 2679 2680 2681 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2682 JVMWrapper("JVM_GetMethodIxMaxStack"); 2683 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2684 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2685 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2686 return method->verifier_max_stack(); 2687 JVM_END 2688 2689 2690 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2691 JVMWrapper("JVM_IsConstructorIx"); 2692 ResourceMark rm(THREAD); 2693 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2694 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2695 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2696 return method->name() == vmSymbols::object_initializer_name(); 2697 JVM_END 2698 2699 2700 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2701 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2702 ResourceMark rm(THREAD); 2703 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2704 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2705 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2706 return method->is_overpass(); 2707 JVM_END 2708 2709 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2710 JVMWrapper("JVM_GetMethodIxIxUTF"); 2711 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2712 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2713 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2714 return method->name()->as_utf8(); 2715 JVM_END 2716 2717 2718 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2719 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2720 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2721 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2722 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2723 return method->signature()->as_utf8(); 2724 JVM_END 2725 2726 /** 2727 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2728 * read entries in the constant pool. Since the old verifier always 2729 * works on a copy of the code, it will not see any rewriting that 2730 * may possibly occur in the middle of verification. So it is important 2731 * that nothing it calls tries to use the cpCache instead of the raw 2732 * constant pool, so we must use cp->uncached_x methods when appropriate. 2733 */ 2734 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2735 JVMWrapper("JVM_GetCPFieldNameUTF"); 2736 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2737 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2738 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2739 switch (cp->tag_at(cp_index).value()) { 2740 case JVM_CONSTANT_Fieldref: 2741 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2742 default: 2743 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2744 } 2745 ShouldNotReachHere(); 2746 return NULL; 2747 JVM_END 2748 2749 2750 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2751 JVMWrapper("JVM_GetCPMethodNameUTF"); 2752 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2753 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2754 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2755 switch (cp->tag_at(cp_index).value()) { 2756 case JVM_CONSTANT_InterfaceMethodref: 2757 case JVM_CONSTANT_Methodref: 2758 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2759 default: 2760 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2761 } 2762 ShouldNotReachHere(); 2763 return NULL; 2764 JVM_END 2765 2766 2767 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2768 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2769 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2770 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2771 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2772 switch (cp->tag_at(cp_index).value()) { 2773 case JVM_CONSTANT_InterfaceMethodref: 2774 case JVM_CONSTANT_Methodref: 2775 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2776 default: 2777 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2778 } 2779 ShouldNotReachHere(); 2780 return NULL; 2781 JVM_END 2782 2783 2784 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2785 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2786 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2787 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2788 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2789 switch (cp->tag_at(cp_index).value()) { 2790 case JVM_CONSTANT_Fieldref: 2791 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2792 default: 2793 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2794 } 2795 ShouldNotReachHere(); 2796 return NULL; 2797 JVM_END 2798 2799 2800 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2801 JVMWrapper("JVM_GetCPClassNameUTF"); 2802 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2803 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2804 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2805 Symbol* classname = cp->klass_name_at(cp_index); 2806 return classname->as_utf8(); 2807 JVM_END 2808 2809 2810 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2811 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2812 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2813 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2814 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2815 switch (cp->tag_at(cp_index).value()) { 2816 case JVM_CONSTANT_Fieldref: { 2817 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2818 Symbol* classname = cp->klass_name_at(class_index); 2819 return classname->as_utf8(); 2820 } 2821 default: 2822 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2823 } 2824 ShouldNotReachHere(); 2825 return NULL; 2826 JVM_END 2827 2828 2829 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2830 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2831 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2832 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2833 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2834 switch (cp->tag_at(cp_index).value()) { 2835 case JVM_CONSTANT_Methodref: 2836 case JVM_CONSTANT_InterfaceMethodref: { 2837 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2838 Symbol* classname = cp->klass_name_at(class_index); 2839 return classname->as_utf8(); 2840 } 2841 default: 2842 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2843 } 2844 ShouldNotReachHere(); 2845 return NULL; 2846 JVM_END 2847 2848 2849 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2850 JVMWrapper("JVM_GetCPFieldModifiers"); 2851 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2852 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2853 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2854 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2855 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2856 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2857 switch (cp->tag_at(cp_index).value()) { 2858 case JVM_CONSTANT_Fieldref: { 2859 Symbol* name = cp->uncached_name_ref_at(cp_index); 2860 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2861 InstanceKlass* ik = InstanceKlass::cast(k_called); 2862 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2863 if (fs.name() == name && fs.signature() == signature) { 2864 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2865 } 2866 } 2867 return -1; 2868 } 2869 default: 2870 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2871 } 2872 ShouldNotReachHere(); 2873 return 0; 2874 JVM_END 2875 2876 2877 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2878 JVMWrapper("JVM_GetCPMethodModifiers"); 2879 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2880 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2881 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2882 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2883 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2884 switch (cp->tag_at(cp_index).value()) { 2885 case JVM_CONSTANT_Methodref: 2886 case JVM_CONSTANT_InterfaceMethodref: { 2887 Symbol* name = cp->uncached_name_ref_at(cp_index); 2888 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2889 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2890 int methods_count = methods->length(); 2891 for (int i = 0; i < methods_count; i++) { 2892 Method* method = methods->at(i); 2893 if (method->name() == name && method->signature() == signature) { 2894 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2895 } 2896 } 2897 return -1; 2898 } 2899 default: 2900 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2901 } 2902 ShouldNotReachHere(); 2903 return 0; 2904 JVM_END 2905 2906 2907 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2908 2909 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2910 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2911 JVM_END 2912 2913 2914 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2915 JVMWrapper("JVM_IsSameClassPackage"); 2916 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2917 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2918 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2919 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2920 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2921 JVM_END 2922 2923 // Printing support ////////////////////////////////////////////////// 2924 extern "C" { 2925 2926 ATTRIBUTE_PRINTF(3, 0) 2927 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2928 // Reject count values that are negative signed values converted to 2929 // unsigned; see bug 4399518, 4417214 2930 if ((intptr_t)count <= 0) return -1; 2931 2932 int result = os::vsnprintf(str, count, fmt, args); 2933 if (result > 0 && (size_t)result >= count) { 2934 result = -1; 2935 } 2936 2937 return result; 2938 } 2939 2940 ATTRIBUTE_PRINTF(3, 4) 2941 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2942 va_list args; 2943 int len; 2944 va_start(args, fmt); 2945 len = jio_vsnprintf(str, count, fmt, args); 2946 va_end(args); 2947 return len; 2948 } 2949 2950 ATTRIBUTE_PRINTF(2, 3) 2951 int jio_fprintf(FILE* f, const char *fmt, ...) { 2952 int len; 2953 va_list args; 2954 va_start(args, fmt); 2955 len = jio_vfprintf(f, fmt, args); 2956 va_end(args); 2957 return len; 2958 } 2959 2960 ATTRIBUTE_PRINTF(2, 0) 2961 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2962 if (Arguments::vfprintf_hook() != NULL) { 2963 return Arguments::vfprintf_hook()(f, fmt, args); 2964 } else { 2965 return vfprintf(f, fmt, args); 2966 } 2967 } 2968 2969 ATTRIBUTE_PRINTF(1, 2) 2970 JNIEXPORT int jio_printf(const char *fmt, ...) { 2971 int len; 2972 va_list args; 2973 va_start(args, fmt); 2974 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2975 va_end(args); 2976 return len; 2977 } 2978 2979 // HotSpot specific jio method 2980 void jio_print(const char* s, size_t len) { 2981 // Try to make this function as atomic as possible. 2982 if (Arguments::vfprintf_hook() != NULL) { 2983 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2984 } else { 2985 // Make an unused local variable to avoid warning from gcc compiler. 2986 size_t count = ::write(defaultStream::output_fd(), s, (int)len); 2987 } 2988 } 2989 2990 } // Extern C 2991 2992 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2993 2994 // In most of the JVM thread support functions we need to access the 2995 // thread through a ThreadsListHandle to prevent it from exiting and 2996 // being reclaimed while we try to operate on it. The exceptions to this 2997 // rule are when operating on the current thread, or if the monitor of 2998 // the target java.lang.Thread is locked at the Java level - in both 2999 // cases the target cannot exit. 3000 3001 static void thread_entry(JavaThread* thread, TRAPS) { 3002 HandleMark hm(THREAD); 3003 Handle obj(THREAD, thread->threadObj()); 3004 JavaValue result(T_VOID); 3005 JavaCalls::call_virtual(&result, 3006 obj, 3007 SystemDictionary::Thread_klass(), 3008 vmSymbols::run_method_name(), 3009 vmSymbols::void_method_signature(), 3010 THREAD); 3011 } 3012 3013 3014 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 3015 JVMWrapper("JVM_StartThread"); 3016 JavaThread *native_thread = NULL; 3017 3018 // We cannot hold the Threads_lock when we throw an exception, 3019 // due to rank ordering issues. Example: we might need to grab the 3020 // Heap_lock while we construct the exception. 3021 bool throw_illegal_thread_state = false; 3022 3023 // We must release the Threads_lock before we can post a jvmti event 3024 // in Thread::start. 3025 { 3026 // Ensure that the C++ Thread and OSThread structures aren't freed before 3027 // we operate. 3028 MutexLocker mu(Threads_lock); 3029 3030 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 3031 // re-starting an already started thread, so we should usually find 3032 // that the JavaThread is null. However for a JNI attached thread 3033 // there is a small window between the Thread object being created 3034 // (with its JavaThread set) and the update to its threadStatus, so we 3035 // have to check for this 3036 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 3037 throw_illegal_thread_state = true; 3038 } else { 3039 // We could also check the stillborn flag to see if this thread was already stopped, but 3040 // for historical reasons we let the thread detect that itself when it starts running 3041 3042 jlong size = 3043 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 3044 // Allocate the C++ Thread structure and create the native thread. The 3045 // stack size retrieved from java is 64-bit signed, but the constructor takes 3046 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 3047 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 3048 // - Avoid passing negative values which would result in really large stacks. 3049 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 3050 size_t sz = size > 0 ? (size_t) size : 0; 3051 native_thread = new JavaThread(&thread_entry, sz); 3052 3053 // At this point it may be possible that no osthread was created for the 3054 // JavaThread due to lack of memory. Check for this situation and throw 3055 // an exception if necessary. Eventually we may want to change this so 3056 // that we only grab the lock if the thread was created successfully - 3057 // then we can also do this check and throw the exception in the 3058 // JavaThread constructor. 3059 if (native_thread->osthread() != NULL) { 3060 // Note: the current thread is not being used within "prepare". 3061 native_thread->prepare(jthread); 3062 } 3063 } 3064 } 3065 3066 if (throw_illegal_thread_state) { 3067 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3068 } 3069 3070 assert(native_thread != NULL, "Starting null thread?"); 3071 3072 if (native_thread->osthread() == NULL) { 3073 // No one should hold a reference to the 'native_thread'. 3074 native_thread->smr_delete(); 3075 if (JvmtiExport::should_post_resource_exhausted()) { 3076 JvmtiExport::post_resource_exhausted( 3077 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3078 os::native_thread_creation_failed_msg()); 3079 } 3080 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3081 os::native_thread_creation_failed_msg()); 3082 } 3083 3084 #if INCLUDE_JFR 3085 if (JfrRecorder::is_recording() && EventThreadStart::is_enabled() && 3086 EventThreadStart::is_stacktrace_enabled()) { 3087 JfrThreadLocal* tl = native_thread->jfr_thread_local(); 3088 // skip Thread.start() and Thread.start0() 3089 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2)); 3090 } 3091 #endif 3092 3093 Thread::start(native_thread); 3094 3095 JVM_END 3096 3097 3098 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 3099 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 3100 // but is thought to be reliable and simple. In the case, where the receiver is the 3101 // same thread as the sender, no VM_Operation is needed. 3102 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 3103 JVMWrapper("JVM_StopThread"); 3104 3105 // A nested ThreadsListHandle will grab the Threads_lock so create 3106 // tlh before we resolve throwable. 3107 ThreadsListHandle tlh(thread); 3108 oop java_throwable = JNIHandles::resolve(throwable); 3109 if (java_throwable == NULL) { 3110 THROW(vmSymbols::java_lang_NullPointerException()); 3111 } 3112 oop java_thread = NULL; 3113 JavaThread* receiver = NULL; 3114 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3115 Events::log_exception(thread, 3116 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 3117 p2i(receiver), p2i(java_thread), p2i(throwable)); 3118 3119 if (is_alive) { 3120 // jthread refers to a live JavaThread. 3121 if (thread == receiver) { 3122 // Exception is getting thrown at self so no VM_Operation needed. 3123 THROW_OOP(java_throwable); 3124 } else { 3125 // Use a VM_Operation to throw the exception. 3126 Thread::send_async_exception(java_thread, java_throwable); 3127 } 3128 } else { 3129 // Either: 3130 // - target thread has not been started before being stopped, or 3131 // - target thread already terminated 3132 // We could read the threadStatus to determine which case it is 3133 // but that is overkill as it doesn't matter. We must set the 3134 // stillborn flag for the first case, and if the thread has already 3135 // exited setting this flag has no effect. 3136 java_lang_Thread::set_stillborn(java_thread); 3137 } 3138 JVM_END 3139 3140 3141 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 3142 JVMWrapper("JVM_IsThreadAlive"); 3143 3144 oop thread_oop = JNIHandles::resolve_non_null(jthread); 3145 return java_lang_Thread::is_alive(thread_oop); 3146 JVM_END 3147 3148 3149 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 3150 JVMWrapper("JVM_SuspendThread"); 3151 3152 ThreadsListHandle tlh(thread); 3153 JavaThread* receiver = NULL; 3154 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3155 if (is_alive) { 3156 // jthread refers to a live JavaThread. 3157 { 3158 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 3159 if (receiver->is_external_suspend()) { 3160 // Don't allow nested external suspend requests. We can't return 3161 // an error from this interface so just ignore the problem. 3162 return; 3163 } 3164 if (receiver->is_exiting()) { // thread is in the process of exiting 3165 return; 3166 } 3167 receiver->set_external_suspend(); 3168 } 3169 3170 // java_suspend() will catch threads in the process of exiting 3171 // and will ignore them. 3172 receiver->java_suspend(); 3173 3174 // It would be nice to have the following assertion in all the 3175 // time, but it is possible for a racing resume request to have 3176 // resumed this thread right after we suspended it. Temporarily 3177 // enable this assertion if you are chasing a different kind of 3178 // bug. 3179 // 3180 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 3181 // receiver->is_being_ext_suspended(), "thread is not suspended"); 3182 } 3183 JVM_END 3184 3185 3186 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 3187 JVMWrapper("JVM_ResumeThread"); 3188 3189 ThreadsListHandle tlh(thread); 3190 JavaThread* receiver = NULL; 3191 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3192 if (is_alive) { 3193 // jthread refers to a live JavaThread. 3194 3195 // This is the original comment for this Threads_lock grab: 3196 // We need to *always* get the threads lock here, since this operation cannot be allowed during 3197 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 3198 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 3199 // looks at it. 3200 // 3201 // The above comment dates back to when we had both internal and 3202 // external suspend APIs that shared a common underlying mechanism. 3203 // External suspend is now entirely cooperative and doesn't share 3204 // anything with internal suspend. That said, there are some 3205 // assumptions in the VM that an external resume grabs the 3206 // Threads_lock. We can't drop the Threads_lock grab here until we 3207 // resolve the assumptions that exist elsewhere. 3208 // 3209 MutexLocker ml(Threads_lock); 3210 receiver->java_resume(); 3211 } 3212 JVM_END 3213 3214 3215 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3216 JVMWrapper("JVM_SetThreadPriority"); 3217 3218 ThreadsListHandle tlh(thread); 3219 oop java_thread = NULL; 3220 JavaThread* receiver = NULL; 3221 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3222 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3223 3224 if (is_alive) { 3225 // jthread refers to a live JavaThread. 3226 Thread::set_priority(receiver, (ThreadPriority)prio); 3227 } 3228 // Implied else: If the JavaThread hasn't started yet, then the 3229 // priority set in the java.lang.Thread object above will be pushed 3230 // down when it does start. 3231 JVM_END 3232 3233 3234 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3235 JVMWrapper("JVM_Yield"); 3236 if (os::dont_yield()) return; 3237 HOTSPOT_THREAD_YIELD(); 3238 os::naked_yield(); 3239 JVM_END 3240 3241 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) { 3242 assert(event != NULL, "invariant"); 3243 assert(event->should_commit(), "invariant"); 3244 event->set_time(millis); 3245 event->commit(); 3246 } 3247 3248 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3249 JVMWrapper("JVM_Sleep"); 3250 3251 if (millis < 0) { 3252 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3253 } 3254 3255 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3256 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3257 } 3258 3259 // Save current thread state and restore it at the end of this block. 3260 // And set new thread state to SLEEPING. 3261 JavaThreadSleepState jtss(thread); 3262 3263 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3264 EventThreadSleep event; 3265 3266 if (millis == 0) { 3267 os::naked_yield(); 3268 } else { 3269 ThreadState old_state = thread->osthread()->get_state(); 3270 thread->osthread()->set_state(SLEEPING); 3271 if (!thread->sleep(millis)) { // interrupted 3272 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3273 // us while we were sleeping. We do not overwrite those. 3274 if (!HAS_PENDING_EXCEPTION) { 3275 if (event.should_commit()) { 3276 post_thread_sleep_event(&event, millis); 3277 } 3278 HOTSPOT_THREAD_SLEEP_END(1); 3279 3280 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3281 // to properly restore the thread state. That's likely wrong. 3282 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3283 } 3284 } 3285 thread->osthread()->set_state(old_state); 3286 } 3287 if (event.should_commit()) { 3288 post_thread_sleep_event(&event, millis); 3289 } 3290 HOTSPOT_THREAD_SLEEP_END(0); 3291 JVM_END 3292 3293 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3294 JVMWrapper("JVM_CurrentThread"); 3295 oop jthread = thread->threadObj(); 3296 assert (thread != NULL, "no current thread!"); 3297 return JNIHandles::make_local(env, jthread); 3298 JVM_END 3299 3300 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3301 JVMWrapper("JVM_Interrupt"); 3302 3303 ThreadsListHandle tlh(thread); 3304 JavaThread* receiver = NULL; 3305 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3306 if (is_alive) { 3307 // jthread refers to a live JavaThread. 3308 receiver->interrupt(); 3309 } 3310 JVM_END 3311 3312 3313 // Return true iff the current thread has locked the object passed in 3314 3315 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3316 JVMWrapper("JVM_HoldsLock"); 3317 assert(THREAD->is_Java_thread(), "sanity check"); 3318 if (obj == NULL) { 3319 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3320 } 3321 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3322 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3323 JVM_END 3324 3325 3326 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3327 JVMWrapper("JVM_DumpAllStacks"); 3328 VM_PrintThreads op; 3329 VMThread::execute(&op); 3330 if (JvmtiExport::should_post_data_dump()) { 3331 JvmtiExport::post_data_dump(); 3332 } 3333 JVM_END 3334 3335 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3336 JVMWrapper("JVM_SetNativeThreadName"); 3337 3338 // We don't use a ThreadsListHandle here because the current thread 3339 // must be alive. 3340 oop java_thread = JNIHandles::resolve_non_null(jthread); 3341 JavaThread* thr = java_lang_Thread::thread(java_thread); 3342 if (thread == thr && !thr->has_attached_via_jni()) { 3343 // Thread naming is only supported for the current thread and 3344 // we don't set the name of an attached thread to avoid stepping 3345 // on other programs. 3346 ResourceMark rm(thread); 3347 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3348 os::set_native_thread_name(thread_name); 3349 } 3350 JVM_END 3351 3352 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3353 3354 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3355 JVMWrapper("JVM_GetClassContext"); 3356 ResourceMark rm(THREAD); 3357 JvmtiVMObjectAllocEventCollector oam; 3358 vframeStream vfst(thread); 3359 3360 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3361 // This must only be called from SecurityManager.getClassContext 3362 Method* m = vfst.method(); 3363 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3364 m->name() == vmSymbols::getClassContext_name() && 3365 m->signature() == vmSymbols::void_class_array_signature())) { 3366 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3367 } 3368 } 3369 3370 // Collect method holders 3371 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3372 for (; !vfst.at_end(); vfst.security_next()) { 3373 Method* m = vfst.method(); 3374 // Native frames are not returned 3375 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3376 Klass* holder = m->method_holder(); 3377 assert(holder->is_klass(), "just checking"); 3378 klass_array->append(holder); 3379 } 3380 } 3381 3382 // Create result array of type [Ljava/lang/Class; 3383 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3384 // Fill in mirrors corresponding to method holders 3385 for (int i = 0; i < klass_array->length(); i++) { 3386 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3387 } 3388 3389 return (jobjectArray) JNIHandles::make_local(env, result); 3390 JVM_END 3391 3392 3393 // java.lang.Package //////////////////////////////////////////////////////////////// 3394 3395 3396 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3397 JVMWrapper("JVM_GetSystemPackage"); 3398 ResourceMark rm(THREAD); 3399 JvmtiVMObjectAllocEventCollector oam; 3400 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3401 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3402 return (jstring) JNIHandles::make_local(result); 3403 JVM_END 3404 3405 3406 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3407 JVMWrapper("JVM_GetSystemPackages"); 3408 JvmtiVMObjectAllocEventCollector oam; 3409 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3410 return (jobjectArray) JNIHandles::make_local(result); 3411 JVM_END 3412 3413 3414 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3415 3416 3417 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3418 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3419 3420 MonitorLocker ml(Heap_lock); 3421 oop ref = Universe::reference_pending_list(); 3422 if (ref != NULL) { 3423 Universe::set_reference_pending_list(NULL); 3424 } 3425 return JNIHandles::make_local(env, ref); 3426 JVM_END 3427 3428 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3429 JVMWrapper("JVM_HasReferencePendingList"); 3430 MonitorLocker ml(Heap_lock); 3431 return Universe::has_reference_pending_list(); 3432 JVM_END 3433 3434 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3435 JVMWrapper("JVM_WaitForReferencePendingList"); 3436 MonitorLocker ml(Heap_lock); 3437 while (!Universe::has_reference_pending_list()) { 3438 ml.wait(); 3439 } 3440 JVM_END 3441 3442 3443 // ObjectInputStream /////////////////////////////////////////////////////////////// 3444 3445 // Return the first user-defined class loader up the execution stack, or null 3446 // if only code from the bootstrap or platform class loader is on the stack. 3447 3448 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3449 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3450 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3451 oop loader = vfst.method()->method_holder()->class_loader(); 3452 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3453 return JNIHandles::make_local(env, loader); 3454 } 3455 } 3456 return NULL; 3457 JVM_END 3458 3459 3460 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3461 3462 3463 // resolve array handle and check arguments 3464 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3465 if (arr == NULL) { 3466 THROW_0(vmSymbols::java_lang_NullPointerException()); 3467 } 3468 oop a = JNIHandles::resolve_non_null(arr); 3469 if (!a->is_array()) { 3470 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3471 } else if (type_array_only && !a->is_typeArray()) { 3472 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3473 } 3474 return arrayOop(a); 3475 } 3476 3477 3478 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3479 JVMWrapper("JVM_GetArrayLength"); 3480 arrayOop a = check_array(env, arr, false, CHECK_0); 3481 return a->length(); 3482 JVM_END 3483 3484 3485 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3486 JVMWrapper("JVM_Array_Get"); 3487 JvmtiVMObjectAllocEventCollector oam; 3488 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3489 jvalue value; 3490 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3491 oop box = Reflection::box(&value, type, CHECK_NULL); 3492 return JNIHandles::make_local(env, box); 3493 JVM_END 3494 3495 3496 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3497 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3498 jvalue value; 3499 value.i = 0; // to initialize value before getting used in CHECK 3500 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3501 assert(a->is_typeArray(), "just checking"); 3502 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3503 BasicType wide_type = (BasicType) wCode; 3504 if (type != wide_type) { 3505 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3506 } 3507 return value; 3508 JVM_END 3509 3510 3511 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3512 JVMWrapper("JVM_SetArrayElement"); 3513 arrayOop a = check_array(env, arr, false, CHECK); 3514 oop box = JNIHandles::resolve(val); 3515 jvalue value; 3516 value.i = 0; // to initialize value before getting used in CHECK 3517 BasicType value_type; 3518 if (a->is_objArray()) { 3519 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3520 value_type = Reflection::unbox_for_regular_object(box, &value); 3521 } else { 3522 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3523 } 3524 Reflection::array_set(&value, a, index, value_type, CHECK); 3525 JVM_END 3526 3527 3528 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3529 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3530 arrayOop a = check_array(env, arr, true, CHECK); 3531 assert(a->is_typeArray(), "just checking"); 3532 BasicType value_type = (BasicType) vCode; 3533 Reflection::array_set(&v, a, index, value_type, CHECK); 3534 JVM_END 3535 3536 3537 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3538 JVMWrapper("JVM_NewArray"); 3539 JvmtiVMObjectAllocEventCollector oam; 3540 oop element_mirror = JNIHandles::resolve(eltClass); 3541 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3542 return JNIHandles::make_local(env, result); 3543 JVM_END 3544 3545 3546 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3547 JVMWrapper("JVM_NewMultiArray"); 3548 JvmtiVMObjectAllocEventCollector oam; 3549 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3550 oop element_mirror = JNIHandles::resolve(eltClass); 3551 assert(dim_array->is_typeArray(), "just checking"); 3552 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3553 return JNIHandles::make_local(env, result); 3554 JVM_END 3555 3556 3557 // Library support /////////////////////////////////////////////////////////////////////////// 3558 3559 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3560 //%note jvm_ct 3561 JVMWrapper("JVM_LoadLibrary"); 3562 char ebuf[1024]; 3563 void *load_result; 3564 { 3565 ThreadToNativeFromVM ttnfvm(thread); 3566 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3567 } 3568 if (load_result == NULL) { 3569 char msg[1024]; 3570 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3571 // Since 'ebuf' may contain a string encoded using 3572 // platform encoding scheme, we need to pass 3573 // Exceptions::unsafe_to_utf8 to the new_exception method 3574 // as the last argument. See bug 6367357. 3575 Handle h_exception = 3576 Exceptions::new_exception(thread, 3577 vmSymbols::java_lang_UnsatisfiedLinkError(), 3578 msg, Exceptions::unsafe_to_utf8); 3579 3580 THROW_HANDLE_0(h_exception); 3581 } 3582 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3583 return load_result; 3584 JVM_END 3585 3586 3587 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3588 JVMWrapper("JVM_UnloadLibrary"); 3589 os::dll_unload(handle); 3590 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3591 JVM_END 3592 3593 3594 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3595 JVMWrapper("JVM_FindLibraryEntry"); 3596 void* find_result = os::dll_lookup(handle, name); 3597 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3598 find_result != NULL ? "Found" : "Failed to find", 3599 name, p2i(handle)); 3600 return find_result; 3601 JVM_END 3602 3603 3604 // JNI version /////////////////////////////////////////////////////////////////////////////// 3605 3606 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3607 JVMWrapper("JVM_IsSupportedJNIVersion"); 3608 return Threads::is_supported_jni_version_including_1_1(version); 3609 JVM_END 3610 3611 3612 // String support /////////////////////////////////////////////////////////////////////////// 3613 3614 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3615 JVMWrapper("JVM_InternString"); 3616 JvmtiVMObjectAllocEventCollector oam; 3617 if (str == NULL) return NULL; 3618 oop string = JNIHandles::resolve_non_null(str); 3619 oop result = StringTable::intern(string, CHECK_NULL); 3620 return (jstring) JNIHandles::make_local(env, result); 3621 JVM_END 3622 3623 3624 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3625 3626 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3627 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3628 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3629 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3630 // nature. JavaThreads will be "in native" when using this API from JDK code. 3631 3632 3633 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3634 VM_Exit::block_if_vm_exited(); 3635 JVMWrapper("JVM_RawMonitorCreate"); 3636 return new os::PlatformMutex(); 3637 } 3638 3639 3640 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3641 VM_Exit::block_if_vm_exited(); 3642 JVMWrapper("JVM_RawMonitorDestroy"); 3643 delete ((os::PlatformMutex*) mon); 3644 } 3645 3646 3647 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3648 VM_Exit::block_if_vm_exited(); 3649 JVMWrapper("JVM_RawMonitorEnter"); 3650 ((os::PlatformMutex*) mon)->lock(); 3651 return 0; 3652 } 3653 3654 3655 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3656 VM_Exit::block_if_vm_exited(); 3657 JVMWrapper("JVM_RawMonitorExit"); 3658 ((os::PlatformMutex*) mon)->unlock(); 3659 } 3660 3661 3662 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3663 3664 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3665 Handle loader, Handle protection_domain, 3666 jboolean throwError, TRAPS) { 3667 // Security Note: 3668 // The Java level wrapper will perform the necessary security check allowing 3669 // us to pass the NULL as the initiating class loader. The VM is responsible for 3670 // the checkPackageAccess relative to the initiating class loader via the 3671 // protection_domain. The protection_domain is passed as NULL by the java code 3672 // if there is no security manager in 3-arg Class.forName(). 3673 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3674 3675 // Check if we should initialize the class 3676 if (init && klass->is_instance_klass()) { 3677 klass->initialize(CHECK_NULL); 3678 } 3679 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3680 } 3681 3682 3683 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3684 3685 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3686 JVMWrapper("JVM_InvokeMethod"); 3687 Handle method_handle; 3688 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3689 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3690 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3691 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3692 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3693 jobject res = JNIHandles::make_local(env, result); 3694 if (JvmtiExport::should_post_vm_object_alloc()) { 3695 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3696 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3697 if (java_lang_Class::is_primitive(ret_type)) { 3698 // Only for primitive type vm allocates memory for java object. 3699 // See box() method. 3700 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3701 } 3702 } 3703 return res; 3704 } else { 3705 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3706 } 3707 JVM_END 3708 3709 3710 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3711 JVMWrapper("JVM_NewInstanceFromConstructor"); 3712 oop constructor_mirror = JNIHandles::resolve(c); 3713 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3714 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3715 jobject res = JNIHandles::make_local(env, result); 3716 if (JvmtiExport::should_post_vm_object_alloc()) { 3717 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3718 } 3719 return res; 3720 JVM_END 3721 3722 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3723 3724 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3725 JVMWrapper("JVM_SupportsCX8"); 3726 return VM_Version::supports_cx8(); 3727 JVM_END 3728 3729 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3730 JVMWrapper("JVM_InitializeFromArchive"); 3731 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3732 assert(k->is_klass(), "just checking"); 3733 HeapShared::initialize_from_archived_subgraph(k); 3734 JVM_END 3735 3736 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForCDSDump()) 3737 JVMWrapper("JVM_GetRandomSeedForCDSDump"); 3738 if (DumpSharedSpaces) { 3739 const char* release = Abstract_VM_Version::vm_release(); 3740 const char* dbg_level = Abstract_VM_Version::jdk_debug_level(); 3741 const char* version = VM_Version::internal_vm_info_string(); 3742 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3743 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3744 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3745 seed += (jlong)Abstract_VM_Version::vm_major_version(); 3746 seed += (jlong)Abstract_VM_Version::vm_minor_version(); 3747 seed += (jlong)Abstract_VM_Version::vm_security_version(); 3748 seed += (jlong)Abstract_VM_Version::vm_patch_version(); 3749 if (seed == 0) { // don't let this ever be zero. 3750 seed = 0x87654321; 3751 } 3752 log_debug(cds)("JVM_GetRandomSeedForCDSDump() = " JLONG_FORMAT, seed); 3753 return seed; 3754 } else { 3755 return 0; 3756 } 3757 JVM_END 3758 3759 // Returns an array of all live Thread objects (VM internal JavaThreads, 3760 // jvmti agent threads, and JNI attaching threads are skipped) 3761 // See CR 6404306 regarding JNI attaching threads 3762 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3763 ResourceMark rm(THREAD); 3764 ThreadsListEnumerator tle(THREAD, false, false); 3765 JvmtiVMObjectAllocEventCollector oam; 3766 3767 int num_threads = tle.num_threads(); 3768 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3769 objArrayHandle threads_ah(THREAD, r); 3770 3771 for (int i = 0; i < num_threads; i++) { 3772 Handle h = tle.get_threadObj(i); 3773 threads_ah->obj_at_put(i, h()); 3774 } 3775 3776 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3777 JVM_END 3778 3779 3780 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3781 // Return StackTraceElement[][], each element is the stack trace of a thread in 3782 // the corresponding entry in the given threads array 3783 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3784 JVMWrapper("JVM_DumpThreads"); 3785 JvmtiVMObjectAllocEventCollector oam; 3786 3787 // Check if threads is null 3788 if (threads == NULL) { 3789 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3790 } 3791 3792 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3793 objArrayHandle ah(THREAD, a); 3794 int num_threads = ah->length(); 3795 // check if threads is non-empty array 3796 if (num_threads == 0) { 3797 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3798 } 3799 3800 // check if threads is not an array of objects of Thread class 3801 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3802 if (k != SystemDictionary::Thread_klass()) { 3803 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3804 } 3805 3806 ResourceMark rm(THREAD); 3807 3808 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3809 for (int i = 0; i < num_threads; i++) { 3810 oop thread_obj = ah->obj_at(i); 3811 instanceHandle h(THREAD, (instanceOop) thread_obj); 3812 thread_handle_array->append(h); 3813 } 3814 3815 // The JavaThread references in thread_handle_array are validated 3816 // in VM_ThreadDump::doit(). 3817 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3818 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3819 3820 JVM_END 3821 3822 // JVM monitoring and management support 3823 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3824 return Management::get_jmm_interface(version); 3825 JVM_END 3826 3827 // com.sun.tools.attach.VirtualMachine agent properties support 3828 // 3829 // Initialize the agent properties with the properties maintained in the VM 3830 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3831 JVMWrapper("JVM_InitAgentProperties"); 3832 ResourceMark rm; 3833 3834 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3835 3836 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3837 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3838 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3839 return properties; 3840 JVM_END 3841 3842 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3843 { 3844 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3845 JvmtiVMObjectAllocEventCollector oam; 3846 3847 if (ofClass == NULL) { 3848 return NULL; 3849 } 3850 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3851 // Special handling for primitive objects 3852 if (java_lang_Class::is_primitive(mirror())) { 3853 return NULL; 3854 } 3855 Klass* k = java_lang_Class::as_Klass(mirror()); 3856 if (!k->is_instance_klass()) { 3857 return NULL; 3858 } 3859 InstanceKlass* ik = InstanceKlass::cast(k); 3860 int encl_method_class_idx = ik->enclosing_method_class_index(); 3861 if (encl_method_class_idx == 0) { 3862 return NULL; 3863 } 3864 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3865 objArrayHandle dest(THREAD, dest_o); 3866 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3867 dest->obj_at_put(0, enc_k->java_mirror()); 3868 int encl_method_method_idx = ik->enclosing_method_method_index(); 3869 if (encl_method_method_idx != 0) { 3870 Symbol* sym = ik->constants()->symbol_at( 3871 extract_low_short_from_int( 3872 ik->constants()->name_and_type_at(encl_method_method_idx))); 3873 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3874 dest->obj_at_put(1, str()); 3875 sym = ik->constants()->symbol_at( 3876 extract_high_short_from_int( 3877 ik->constants()->name_and_type_at(encl_method_method_idx))); 3878 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3879 dest->obj_at_put(2, str()); 3880 } 3881 return (jobjectArray) JNIHandles::make_local(dest()); 3882 } 3883 JVM_END 3884 3885 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3886 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3887 ResourceMark rm(THREAD); 3888 3889 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3890 return NULL; 3891 } 3892 3893 char** vm_flags = Arguments::jvm_flags_array(); 3894 char** vm_args = Arguments::jvm_args_array(); 3895 int num_flags = Arguments::num_jvm_flags(); 3896 int num_args = Arguments::num_jvm_args(); 3897 3898 InstanceKlass* ik = SystemDictionary::String_klass(); 3899 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3900 objArrayHandle result_h(THREAD, r); 3901 3902 int index = 0; 3903 for (int j = 0; j < num_flags; j++, index++) { 3904 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3905 result_h->obj_at_put(index, h()); 3906 } 3907 for (int i = 0; i < num_args; i++, index++) { 3908 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3909 result_h->obj_at_put(index, h()); 3910 } 3911 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3912 JVM_END 3913 3914 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3915 return os::get_signal_number(name); 3916 JVM_END