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.hpp" 30 #include "classfile/classLoaderData.inline.hpp" 31 #include "classfile/javaAssertions.hpp" 32 #include "classfile/javaClasses.inline.hpp" 33 #include "classfile/moduleEntry.hpp" 34 #include "classfile/modules.hpp" 35 #include "classfile/packageEntry.hpp" 36 #include "classfile/stringTable.hpp" 37 #include "classfile/symbolTable.hpp" 38 #include "classfile/systemDictionary.hpp" 39 #include "classfile/vmSymbols.hpp" 40 #include "gc/shared/collectedHeap.inline.hpp" 41 #include "interpreter/bytecode.hpp" 42 #include "interpreter/bytecodeUtils.hpp" 43 #include "jfr/jfrEvents.hpp" 44 #include "logging/log.hpp" 45 #include "memory/dynamicArchive.hpp" 46 #include "memory/heapShared.hpp" 47 #include "memory/oopFactory.hpp" 48 #include "memory/referenceType.hpp" 49 #include "memory/resourceArea.hpp" 50 #include "memory/universe.hpp" 51 #include "oops/access.inline.hpp" 52 #include "oops/constantPool.hpp" 53 #include "oops/fieldStreams.inline.hpp" 54 #include "oops/instanceKlass.hpp" 55 #include "oops/method.hpp" 56 #include "oops/recordComponent.hpp" 57 #include "oops/objArrayKlass.hpp" 58 #include "oops/objArrayOop.inline.hpp" 59 #include "oops/oop.inline.hpp" 60 #include "prims/jvm_misc.hpp" 61 #include "prims/jvmtiExport.hpp" 62 #include "prims/jvmtiThreadState.hpp" 63 #include "prims/nativeLookup.hpp" 64 #include "prims/stackwalk.hpp" 65 #include "runtime/arguments.hpp" 66 #include "runtime/atomic.hpp" 67 #include "runtime/handles.inline.hpp" 68 #include "runtime/init.hpp" 69 #include "runtime/interfaceSupport.inline.hpp" 70 #include "runtime/deoptimization.hpp" 71 #include "runtime/handshake.hpp" 72 #include "runtime/java.hpp" 73 #include "runtime/javaCalls.hpp" 74 #include "runtime/jfieldIDWorkaround.hpp" 75 #include "runtime/jniHandles.inline.hpp" 76 #include "runtime/os.inline.hpp" 77 #include "runtime/perfData.hpp" 78 #include "runtime/reflection.hpp" 79 #include "runtime/synchronizer.hpp" 80 #include "runtime/thread.inline.hpp" 81 #include "runtime/threadSMR.hpp" 82 #include "runtime/vframe.inline.hpp" 83 #include "runtime/vmOperations.hpp" 84 #include "runtime/vm_version.hpp" 85 #include "services/attachListener.hpp" 86 #include "services/management.hpp" 87 #include "services/threadService.hpp" 88 #include "utilities/copy.hpp" 89 #include "utilities/defaultStream.hpp" 90 #include "utilities/dtrace.hpp" 91 #include "utilities/events.hpp" 92 #include "utilities/histogram.hpp" 93 #include "utilities/macros.hpp" 94 #include "utilities/utf8.hpp" 95 #if INCLUDE_CDS 96 #include "classfile/systemDictionaryShared.hpp" 97 #endif 98 #if INCLUDE_JFR 99 #include "jfr/jfr.hpp" 100 #endif 101 102 #include <errno.h> 103 104 /* 105 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 106 such ctors and calls MUST NOT come between an oop declaration/init and its 107 usage because if objects are move this may cause various memory stomps, bus 108 errors and segfaults. Here is a cookbook for causing so called "naked oop 109 failures": 110 111 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 112 JVMWrapper("JVM_GetClassDeclaredFields"); 113 114 // Object address to be held directly in mirror & not visible to GC 115 oop mirror = JNIHandles::resolve_non_null(ofClass); 116 117 // If this ctor can hit a safepoint, moving objects around, then 118 ComplexConstructor foo; 119 120 // Boom! mirror may point to JUNK instead of the intended object 121 (some dereference of mirror) 122 123 // Here's another call that may block for GC, making mirror stale 124 MutexLocker ml(some_lock); 125 126 // And here's an initializer that can result in a stale oop 127 // all in one step. 128 oop o = call_that_can_throw_exception(TRAPS); 129 130 131 The solution is to keep the oop declaration BELOW the ctor or function 132 call that might cause a GC, do another resolve to reassign the oop, or 133 consider use of a Handle instead of an oop so there is immunity from object 134 motion. But note that the "QUICK" entries below do not have a handlemark 135 and thus can only support use of handles passed in. 136 */ 137 138 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 139 ResourceMark rm; 140 int line_number = -1; 141 const char * source_file = NULL; 142 const char * trace = "explicit"; 143 InstanceKlass* caller = NULL; 144 JavaThread* jthread = JavaThread::current(); 145 if (jthread->has_last_Java_frame()) { 146 vframeStream vfst(jthread); 147 148 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 149 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController"); 150 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 151 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction"); 152 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 153 154 Method* last_caller = NULL; 155 156 while (!vfst.at_end()) { 157 Method* m = vfst.method(); 158 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 159 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 160 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 161 break; 162 } 163 last_caller = m; 164 vfst.next(); 165 } 166 // if this is called from Class.forName0 and that is called from Class.forName, 167 // then print the caller of Class.forName. If this is Class.loadClass, then print 168 // that caller, otherwise keep quiet since this should be picked up elsewhere. 169 bool found_it = false; 170 if (!vfst.at_end() && 171 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 172 vfst.method()->name() == vmSymbols::forName0_name()) { 173 vfst.next(); 174 if (!vfst.at_end() && 175 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 176 vfst.method()->name() == vmSymbols::forName_name()) { 177 vfst.next(); 178 found_it = true; 179 } 180 } else if (last_caller != NULL && 181 last_caller->method_holder()->name() == 182 vmSymbols::java_lang_ClassLoader() && 183 last_caller->name() == vmSymbols::loadClass_name()) { 184 found_it = true; 185 } else if (!vfst.at_end()) { 186 if (vfst.method()->is_native()) { 187 // JNI call 188 found_it = true; 189 } 190 } 191 if (found_it && !vfst.at_end()) { 192 // found the caller 193 caller = vfst.method()->method_holder(); 194 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 195 if (line_number == -1) { 196 // show method name if it's a native method 197 trace = vfst.method()->name_and_sig_as_C_string(); 198 } 199 Symbol* s = caller->source_file_name(); 200 if (s != NULL) { 201 source_file = s->as_C_string(); 202 } 203 } 204 } 205 if (caller != NULL) { 206 if (to_class != caller) { 207 const char * from = caller->external_name(); 208 const char * to = to_class->external_name(); 209 // print in a single call to reduce interleaving between threads 210 if (source_file != NULL) { 211 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 212 } else { 213 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 214 } 215 } 216 } 217 } 218 219 void trace_class_resolution(Klass* to_class) { 220 EXCEPTION_MARK; 221 trace_class_resolution_impl(to_class, THREAD); 222 if (HAS_PENDING_EXCEPTION) { 223 CLEAR_PENDING_EXCEPTION; 224 } 225 } 226 227 // Wrapper to trace JVM functions 228 229 #ifdef ASSERT 230 Histogram* JVMHistogram; 231 volatile int JVMHistogram_lock = 0; 232 233 class JVMHistogramElement : public HistogramElement { 234 public: 235 JVMHistogramElement(const char* name); 236 }; 237 238 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 239 _name = elementName; 240 uintx count = 0; 241 242 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) { 243 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) { 244 count +=1; 245 if ( (WarnOnStalledSpinLock > 0) 246 && (count % WarnOnStalledSpinLock == 0)) { 247 warning("JVMHistogram_lock seems to be stalled"); 248 } 249 } 250 } 251 252 if(JVMHistogram == NULL) 253 JVMHistogram = new Histogram("JVM Call Counts",100); 254 255 JVMHistogram->add_element(this); 256 Atomic::dec(&JVMHistogram_lock); 257 } 258 259 #define JVMCountWrapper(arg) \ 260 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 261 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 262 263 #define JVMWrapper(arg) JVMCountWrapper(arg); 264 #else 265 #define JVMWrapper(arg) 266 #endif 267 268 269 // Interface version ///////////////////////////////////////////////////////////////////// 270 271 272 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 273 return JVM_INTERFACE_VERSION; 274 JVM_END 275 276 277 // java.lang.System ////////////////////////////////////////////////////////////////////// 278 279 280 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 281 JVMWrapper("JVM_CurrentTimeMillis"); 282 return os::javaTimeMillis(); 283 JVM_END 284 285 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 286 JVMWrapper("JVM_NanoTime"); 287 return os::javaTimeNanos(); 288 JVM_END 289 290 // The function below is actually exposed by jdk.internal.misc.VM and not 291 // java.lang.System, but we choose to keep it here so that it stays next 292 // to JVM_CurrentTimeMillis and JVM_NanoTime 293 294 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 295 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 296 297 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 298 JVMWrapper("JVM_GetNanoTimeAdjustment"); 299 jlong seconds; 300 jlong nanos; 301 302 os::javaTimeSystemUTC(seconds, nanos); 303 304 // We're going to verify that the result can fit in a long. 305 // For that we need the difference in seconds between 'seconds' 306 // and 'offset_secs' to be such that: 307 // |seconds - offset_secs| < (2^63/10^9) 308 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 309 // which makes |seconds - offset_secs| < 2^33 310 // and we will prefer +/- 2^32 as the maximum acceptable diff 311 // as 2^32 has a more natural feel than 2^33... 312 // 313 // So if |seconds - offset_secs| >= 2^32 - we return a special 314 // sentinel value (-1) which the caller should take as an 315 // exception value indicating that the offset given to us is 316 // too far from range of the current time - leading to too big 317 // a nano adjustment. The caller is expected to recover by 318 // computing a more accurate offset and calling this method 319 // again. (For the record 2^32 secs is ~136 years, so that 320 // should rarely happen) 321 // 322 jlong diff = seconds - offset_secs; 323 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 324 return -1; // sentinel value: the offset is too far off the target 325 } 326 327 // return the adjustment. If you compute a time by adding 328 // this number of nanoseconds along with the number of seconds 329 // in the offset you should get the current UTC time. 330 return (diff * (jlong)1000000000) + nanos; 331 JVM_END 332 333 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 334 jobject dst, jint dst_pos, jint length)) 335 JVMWrapper("JVM_ArrayCopy"); 336 // Check if we have null pointers 337 if (src == NULL || dst == NULL) { 338 THROW(vmSymbols::java_lang_NullPointerException()); 339 } 340 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 341 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 342 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 343 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 344 // Do copy 345 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 346 JVM_END 347 348 349 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 350 JavaValue r(T_OBJECT); 351 // public synchronized Object put(Object key, Object value); 352 HandleMark hm(THREAD); 353 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 354 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 355 JavaCalls::call_virtual(&r, 356 props, 357 SystemDictionary::Properties_klass(), 358 vmSymbols::put_name(), 359 vmSymbols::object_object_object_signature(), 360 key_str, 361 value_str, 362 THREAD); 363 } 364 365 366 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 367 368 /* 369 * Return all of the system properties in a Java String array with alternating 370 * names and values from the jvm SystemProperty. 371 * Which includes some internal and all commandline -D defined properties. 372 */ 373 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 374 JVMWrapper("JVM_GetProperties"); 375 ResourceMark rm(THREAD); 376 HandleMark hm(THREAD); 377 int ndx = 0; 378 int fixedCount = 2; 379 380 SystemProperty* p = Arguments::system_properties(); 381 int count = Arguments::PropertyList_count(p); 382 383 // Allocate result String array 384 InstanceKlass* ik = SystemDictionary::String_klass(); 385 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 386 objArrayHandle result_h(THREAD, r); 387 388 while (p != NULL) { 389 const char * key = p->key(); 390 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 391 const char * value = p->value(); 392 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 393 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL); 394 result_h->obj_at_put(ndx * 2, key_str()); 395 result_h->obj_at_put(ndx * 2 + 1, value_str()); 396 ndx++; 397 } 398 p = p->next(); 399 } 400 401 // Convert the -XX:MaxDirectMemorySize= command line flag 402 // to the sun.nio.MaxDirectMemorySize property. 403 // Do this after setting user properties to prevent people 404 // from setting the value with a -D option, as requested. 405 // Leave empty if not supplied 406 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 407 char as_chars[256]; 408 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 409 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 410 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 411 result_h->obj_at_put(ndx * 2, key_str()); 412 result_h->obj_at_put(ndx * 2 + 1, value_str()); 413 ndx++; 414 } 415 416 // JVM monitoring and management support 417 // Add the sun.management.compiler property for the compiler's name 418 { 419 #undef CSIZE 420 #if defined(_LP64) || defined(_WIN64) 421 #define CSIZE "64-Bit " 422 #else 423 #define CSIZE 424 #endif // 64bit 425 426 #ifdef TIERED 427 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 428 #else 429 #if defined(COMPILER1) 430 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 431 #elif defined(COMPILER2) 432 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 433 #elif INCLUDE_JVMCI 434 #error "INCLUDE_JVMCI should imply TIERED" 435 #else 436 const char* compiler_name = ""; 437 #endif // compilers 438 #endif // TIERED 439 440 if (*compiler_name != '\0' && 441 (Arguments::mode() != Arguments::_int)) { 442 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 443 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 444 result_h->obj_at_put(ndx * 2, key_str()); 445 result_h->obj_at_put(ndx * 2 + 1, value_str()); 446 ndx++; 447 } 448 } 449 450 return (jobjectArray) JNIHandles::make_local(env, result_h()); 451 JVM_END 452 453 454 /* 455 * Return the temporary directory that the VM uses for the attach 456 * and perf data files. 457 * 458 * It is important that this directory is well-known and the 459 * same for all VM instances. It cannot be affected by configuration 460 * variables such as java.io.tmpdir. 461 */ 462 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 463 JVMWrapper("JVM_GetTemporaryDirectory"); 464 HandleMark hm(THREAD); 465 const char* temp_dir = os::get_temp_directory(); 466 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 467 return (jstring) JNIHandles::make_local(env, h()); 468 JVM_END 469 470 471 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 472 473 extern volatile jint vm_created; 474 475 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 476 JVMWrapper("JVM_BeforeHalt"); 477 // Link all classes for dynamic CDS dumping before vm exit. 478 if (DynamicDumpSharedSpaces) { 479 MetaspaceShared::link_and_cleanup_shared_classes(THREAD); 480 } 481 EventShutdown event; 482 if (event.should_commit()) { 483 event.set_reason("Shutdown requested from Java"); 484 event.commit(); 485 } 486 JVM_END 487 488 489 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 490 before_exit(thread); 491 vm_exit(code); 492 JVM_END 493 494 495 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 496 JVMWrapper("JVM_GC"); 497 if (!DisableExplicitGC) { 498 Universe::heap()->collect(GCCause::_java_lang_system_gc); 499 } 500 JVM_END 501 502 503 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 504 JVMWrapper("JVM_MaxObjectInspectionAge"); 505 return Universe::heap()->millis_since_last_gc(); 506 JVM_END 507 508 509 static inline jlong convert_size_t_to_jlong(size_t val) { 510 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 511 NOT_LP64 (return (jlong)val;) 512 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 513 } 514 515 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 516 JVMWrapper("JVM_TotalMemory"); 517 size_t n = Universe::heap()->capacity(); 518 return convert_size_t_to_jlong(n); 519 JVM_END 520 521 522 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 523 JVMWrapper("JVM_FreeMemory"); 524 size_t n = Universe::heap()->unused(); 525 return convert_size_t_to_jlong(n); 526 JVM_END 527 528 529 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 530 JVMWrapper("JVM_MaxMemory"); 531 size_t n = Universe::heap()->max_capacity(); 532 return convert_size_t_to_jlong(n); 533 JVM_END 534 535 536 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 537 JVMWrapper("JVM_ActiveProcessorCount"); 538 return os::active_processor_count(); 539 JVM_END 540 541 542 543 // java.lang.Throwable ////////////////////////////////////////////////////// 544 545 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 546 JVMWrapper("JVM_FillInStackTrace"); 547 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 548 java_lang_Throwable::fill_in_stack_trace(exception); 549 JVM_END 550 551 // java.lang.NullPointerException /////////////////////////////////////////// 552 553 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 554 if (!ShowCodeDetailsInExceptionMessages) return NULL; 555 556 oop exc = JNIHandles::resolve_non_null(throwable); 557 558 Method* method; 559 int bci; 560 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 561 return NULL; 562 } 563 if (method->is_native()) { 564 return NULL; 565 } 566 567 stringStream ss; 568 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 569 if (ok) { 570 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 571 return (jstring) JNIHandles::make_local(env, result); 572 } else { 573 return NULL; 574 } 575 JVM_END 576 577 // java.lang.StackTraceElement ////////////////////////////////////////////// 578 579 580 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 581 JVMWrapper("JVM_InitStackTraceElementArray"); 582 Handle exception(THREAD, JNIHandles::resolve(throwable)); 583 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 584 objArrayHandle stack_trace(THREAD, st); 585 // Fill in the allocated stack trace 586 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 587 JVM_END 588 589 590 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 591 JVMWrapper("JVM_InitStackTraceElement"); 592 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 593 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 594 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 595 JVM_END 596 597 598 // java.lang.StackWalker ////////////////////////////////////////////////////// 599 600 601 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 602 jint skip_frames, jint frame_count, jint start_index, 603 jobjectArray frames)) 604 JVMWrapper("JVM_CallStackWalk"); 605 JavaThread* jt = (JavaThread*) THREAD; 606 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 607 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 608 } 609 610 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 611 612 // frames array is a Class<?>[] array when only getting caller reference, 613 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 614 // be null. 615 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 616 objArrayHandle frames_array_h(THREAD, fa); 617 618 int limit = start_index + frame_count; 619 if (frames_array_h->length() < limit) { 620 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 621 } 622 623 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 624 start_index, frames_array_h, CHECK_NULL); 625 return JNIHandles::make_local(env, result); 626 JVM_END 627 628 629 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 630 jint frame_count, jint start_index, 631 jobjectArray frames)) 632 JVMWrapper("JVM_MoreStackWalk"); 633 JavaThread* jt = (JavaThread*) THREAD; 634 635 // frames array is a Class<?>[] array when only getting caller reference, 636 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 637 // be null. 638 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 639 objArrayHandle frames_array_h(THREAD, fa); 640 641 int limit = start_index+frame_count; 642 if (frames_array_h->length() < limit) { 643 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 644 } 645 646 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 647 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 648 start_index, frames_array_h, THREAD); 649 JVM_END 650 651 // java.lang.Object /////////////////////////////////////////////// 652 653 654 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 655 JVMWrapper("JVM_IHashCode"); 656 // as implemented in the classic virtual machine; return 0 if object is NULL 657 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 658 JVM_END 659 660 661 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 662 JVMWrapper("JVM_MonitorWait"); 663 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 664 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 665 if (JvmtiExport::should_post_monitor_wait()) { 666 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 667 668 // The current thread already owns the monitor and it has not yet 669 // been added to the wait queue so the current thread cannot be 670 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 671 // event handler cannot accidentally consume an unpark() meant for 672 // the ParkEvent associated with this ObjectMonitor. 673 } 674 ObjectSynchronizer::wait(obj, ms, CHECK); 675 JVM_END 676 677 678 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 679 JVMWrapper("JVM_MonitorNotify"); 680 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 681 ObjectSynchronizer::notify(obj, CHECK); 682 JVM_END 683 684 685 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 686 JVMWrapper("JVM_MonitorNotifyAll"); 687 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 688 ObjectSynchronizer::notifyall(obj, CHECK); 689 JVM_END 690 691 692 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 693 JVMWrapper("JVM_Clone"); 694 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 695 Klass* klass = obj->klass(); 696 JvmtiVMObjectAllocEventCollector oam; 697 698 #ifdef ASSERT 699 // Just checking that the cloneable flag is set correct 700 if (obj->is_array()) { 701 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 702 } else { 703 guarantee(obj->is_instance(), "should be instanceOop"); 704 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 705 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 706 } 707 #endif 708 709 // Check if class of obj supports the Cloneable interface. 710 // All arrays are considered to be cloneable (See JLS 20.1.5). 711 // All j.l.r.Reference classes are considered non-cloneable. 712 if (!klass->is_cloneable() || 713 (klass->is_instance_klass() && 714 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 715 ResourceMark rm(THREAD); 716 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 717 } 718 719 // Make shallow object copy 720 const int size = obj->size(); 721 oop new_obj_oop = NULL; 722 if (obj->is_array()) { 723 const int length = ((arrayOop)obj())->length(); 724 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 725 /* do_zero */ true, CHECK_NULL); 726 } else { 727 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 728 } 729 730 HeapAccess<>::clone(obj(), new_obj_oop, size); 731 732 Handle new_obj(THREAD, new_obj_oop); 733 // Caution: this involves a java upcall, so the clone should be 734 // "gc-robust" by this stage. 735 if (klass->has_finalizer()) { 736 assert(obj->is_instance(), "should be instanceOop"); 737 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 738 new_obj = Handle(THREAD, new_obj_oop); 739 } 740 741 return JNIHandles::make_local(env, new_obj()); 742 JVM_END 743 744 // java.io.File /////////////////////////////////////////////////////////////// 745 746 JVM_LEAF(char*, JVM_NativePath(char* path)) 747 JVMWrapper("JVM_NativePath"); 748 return os::native_path(path); 749 JVM_END 750 751 752 // Misc. class handling /////////////////////////////////////////////////////////// 753 754 755 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 756 JVMWrapper("JVM_GetCallerClass"); 757 758 // Getting the class of the caller frame. 759 // 760 // The call stack at this point looks something like this: 761 // 762 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 763 // [1] [ @CallerSensitive API.method ] 764 // [.] [ (skipped intermediate frames) ] 765 // [n] [ caller ] 766 vframeStream vfst(thread); 767 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 768 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 769 Method* m = vfst.method(); 770 assert(m != NULL, "sanity"); 771 switch (n) { 772 case 0: 773 // This must only be called from Reflection.getCallerClass 774 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 775 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 776 } 777 // fall-through 778 case 1: 779 // Frame 0 and 1 must be caller sensitive. 780 if (!m->caller_sensitive()) { 781 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 782 } 783 break; 784 default: 785 if (!m->is_ignored_by_security_stack_walk()) { 786 // We have reached the desired frame; return the holder class. 787 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 788 } 789 break; 790 } 791 } 792 return NULL; 793 JVM_END 794 795 796 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 797 JVMWrapper("JVM_FindPrimitiveClass"); 798 oop mirror = NULL; 799 BasicType t = name2type(utf); 800 if (t != T_ILLEGAL && !is_reference_type(t)) { 801 mirror = Universe::java_mirror(t); 802 } 803 if (mirror == NULL) { 804 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 805 } else { 806 return (jclass) JNIHandles::make_local(env, mirror); 807 } 808 JVM_END 809 810 811 // Returns a class loaded by the bootstrap class loader; or null 812 // if not found. ClassNotFoundException is not thrown. 813 // FindClassFromBootLoader is exported to the launcher for windows. 814 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 815 const char* name)) 816 JVMWrapper("JVM_FindClassFromBootLoader"); 817 818 // Java libraries should ensure that name is never null or illegal. 819 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 820 // It's impossible to create this class; the name cannot fit 821 // into the constant pool. 822 return NULL; 823 } 824 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name"); 825 826 TempNewSymbol h_name = SymbolTable::new_symbol(name); 827 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 828 if (k == NULL) { 829 return NULL; 830 } 831 832 if (log_is_enabled(Debug, class, resolve)) { 833 trace_class_resolution(k); 834 } 835 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 836 JVM_END 837 838 // Find a class with this name in this loader, using the caller's protection domain. 839 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 840 jboolean init, jobject loader, 841 jclass caller)) 842 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 843 844 TempNewSymbol h_name = 845 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 846 CHECK_NULL); 847 848 oop loader_oop = JNIHandles::resolve(loader); 849 oop from_class = JNIHandles::resolve(caller); 850 oop protection_domain = NULL; 851 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 852 // NPE. Put it in another way, the bootstrap class loader has all permission and 853 // thus no checkPackageAccess equivalence in the VM class loader. 854 // The caller is also passed as NULL by the java code if there is no security 855 // manager to avoid the performance cost of getting the calling class. 856 if (from_class != NULL && loader_oop != NULL) { 857 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 858 } 859 860 Handle h_loader(THREAD, loader_oop); 861 Handle h_prot(THREAD, protection_domain); 862 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 863 h_prot, false, THREAD); 864 865 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 866 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 867 } 868 return result; 869 JVM_END 870 871 // Currently only called from the old verifier. 872 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 873 jboolean init, jclass from)) 874 JVMWrapper("JVM_FindClassFromClass"); 875 TempNewSymbol h_name = 876 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(), 877 CHECK_NULL); 878 oop from_class_oop = JNIHandles::resolve(from); 879 Klass* from_class = (from_class_oop == NULL) 880 ? (Klass*)NULL 881 : java_lang_Class::as_Klass(from_class_oop); 882 oop class_loader = NULL; 883 oop protection_domain = NULL; 884 if (from_class != NULL) { 885 class_loader = from_class->class_loader(); 886 protection_domain = from_class->protection_domain(); 887 } 888 Handle h_loader(THREAD, class_loader); 889 Handle h_prot (THREAD, protection_domain); 890 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 891 h_prot, true, thread); 892 893 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 894 // this function is generally only used for class loading during verification. 895 ResourceMark rm; 896 oop from_mirror = JNIHandles::resolve_non_null(from); 897 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 898 const char * from_name = from_class->external_name(); 899 900 oop mirror = JNIHandles::resolve_non_null(result); 901 Klass* to_class = java_lang_Class::as_Klass(mirror); 902 const char * to = to_class->external_name(); 903 log_debug(class, resolve)("%s %s (verification)", from_name, to); 904 } 905 906 return result; 907 JVM_END 908 909 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 910 if (loader.is_null()) { 911 return; 912 } 913 914 // check whether the current caller thread holds the lock or not. 915 // If not, increment the corresponding counter 916 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 917 ObjectSynchronizer::owner_self) { 918 counter->inc(); 919 } 920 } 921 922 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 923 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 924 jobject loader, const jbyte *buf, 925 jsize len, jobject pd, const char *source, 926 TRAPS) { 927 if (source == NULL) source = "__JVM_DefineClass__"; 928 929 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 930 JavaThread* jt = (JavaThread*) THREAD; 931 932 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 933 ClassLoader::perf_define_appclass_selftime(), 934 ClassLoader::perf_define_appclasses(), 935 jt->get_thread_stat()->perf_recursion_counts_addr(), 936 jt->get_thread_stat()->perf_timers_addr(), 937 PerfClassTraceTime::DEFINE_CLASS); 938 939 if (UsePerfData) { 940 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 941 } 942 943 // Class resolution will get the class name from the .class stream if the name is null. 944 TempNewSymbol class_name = name == NULL ? NULL : 945 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 946 CHECK_NULL); 947 948 ResourceMark rm(THREAD); 949 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 950 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 951 if (UsePerfData) { 952 is_lock_held_by_thread(class_loader, 953 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 954 THREAD); 955 } 956 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 957 Klass* k = SystemDictionary::resolve_from_stream(class_name, 958 class_loader, 959 protection_domain, 960 &st, 961 CHECK_NULL); 962 963 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 964 trace_class_resolution(k); 965 } 966 967 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 968 } 969 970 enum { 971 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 972 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 973 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 974 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 975 }; 976 977 /* 978 * Define a class with the specified flags that indicates if it's a nestmate, 979 * hidden, or strongly referenced from class loader. 980 */ 981 static jclass jvm_lookup_define_class(JNIEnv *env, jclass lookup, const char *name, 982 const jbyte *buf, jsize len, jobject pd, 983 jboolean init, int flags, jobject classData, TRAPS) { 984 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 985 JavaThread* jt = (JavaThread*) THREAD; 986 ResourceMark rm(THREAD); 987 988 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup)); 989 // Lookup class must be a non-null instance 990 if (lookup_k == NULL) { 991 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 992 } 993 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass"); 994 995 Handle class_loader (THREAD, lookup_k->class_loader()); 996 997 bool is_nestmate = (flags & NESTMATE) == NESTMATE; 998 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 999 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1000 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1001 1002 InstanceKlass* host_class = NULL; 1003 if (is_nestmate) { 1004 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL); 1005 } 1006 1007 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1008 name, 1009 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1010 is_nestmate ? host_class->external_name() : "", 1011 is_hidden ? "hidden" : "not hidden", 1012 is_strong ? "strong" : "weak", 1013 vm_annotations ? "with vm annotations" : "without vm annotation"); 1014 1015 if (!is_hidden) { 1016 // classData is only applicable for hidden classes 1017 if (classData != NULL) { 1018 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1019 } 1020 if (is_nestmate) { 1021 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1022 } 1023 if (!is_strong) { 1024 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1025 } 1026 if (vm_annotations) { 1027 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1028 } 1029 if (flags != STRONG_LOADER_LINK) { 1030 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1031 err_msg("invalid flag 0x%x", flags)); 1032 } 1033 } 1034 1035 // Class resolution will get the class name from the .class stream if the name is null. 1036 TempNewSymbol class_name = name == NULL ? NULL : 1037 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(), 1038 CHECK_NULL); 1039 1040 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1041 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1042 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 1043 1044 Klass* defined_k; 1045 InstanceKlass* ik = NULL; 1046 if (!is_hidden) { 1047 defined_k = SystemDictionary::resolve_from_stream(class_name, 1048 class_loader, 1049 protection_domain, 1050 &st, 1051 CHECK_NULL); 1052 1053 if (log_is_enabled(Debug, class, resolve) && defined_k != NULL) { 1054 trace_class_resolution(defined_k); 1055 } 1056 ik = InstanceKlass::cast(defined_k); 1057 } else { // hidden 1058 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1059 ClassLoadInfo cl_info(protection_domain, 1060 NULL, // unsafe_anonymous_host 1061 NULL, // cp_patches 1062 host_class, 1063 classData_h, 1064 is_hidden, 1065 is_strong, 1066 vm_annotations); 1067 defined_k = SystemDictionary::parse_stream(class_name, 1068 class_loader, 1069 &st, 1070 cl_info, 1071 CHECK_NULL); 1072 if (defined_k == NULL) { 1073 THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a hidden class"); 1074 } 1075 1076 ik = InstanceKlass::cast(defined_k); 1077 1078 // The hidden class loader data has been artificially been kept alive to 1079 // this point. The mirror and any instances of this class have to keep 1080 // it alive afterwards. 1081 ik->class_loader_data()->dec_keep_alive(); 1082 1083 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1084 ModuleEntry* module = ik->module(); 1085 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1086 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1087 module_name, 1088 ik->external_name(), 1089 host_class->external_name(), 1090 ik->is_hidden() ? "is hidden" : "is not hidden"); 1091 } 1092 } 1093 assert(Reflection::is_same_class_package(lookup_k, defined_k), 1094 "lookup class and defined class are in different packages"); 1095 1096 if (init) { 1097 ik->initialize(CHECK_NULL); 1098 } else { 1099 ik->link_class(CHECK_NULL); 1100 } 1101 1102 return (jclass) JNIHandles::make_local(env, defined_k->java_mirror()); 1103 } 1104 1105 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1106 JVMWrapper("JVM_DefineClass"); 1107 1108 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 1109 JVM_END 1110 1111 /* 1112 * Define a class with the specified lookup class. 1113 * lookup: Lookup class 1114 * name: the name of the class 1115 * buf: class bytes 1116 * len: length of class bytes 1117 * pd: protection domain 1118 * init: initialize the class 1119 * flags: properties of the class 1120 * classData: private static pre-initialized field 1121 */ 1122 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf, 1123 jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1124 JVMWrapper("JVM_LookupDefineClass"); 1125 1126 if (lookup == NULL) { 1127 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1128 } 1129 1130 assert(buf != NULL, "buf must not be NULL"); 1131 1132 return jvm_lookup_define_class(env, lookup, name, buf, len, pd, initialize, flags, classData, THREAD); 1133 JVM_END 1134 1135 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1136 JVMWrapper("JVM_DefineClassWithSource"); 1137 1138 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 1139 JVM_END 1140 1141 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1142 JVMWrapper("JVM_FindLoadedClass"); 1143 ResourceMark rm(THREAD); 1144 1145 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1146 char* str = java_lang_String::as_utf8_string(h_name()); 1147 1148 // Sanity check, don't expect null 1149 if (str == NULL) return NULL; 1150 1151 // Internalize the string, converting '.' to '/' in string. 1152 char* p = (char*)str; 1153 while (*p != '\0') { 1154 if (*p == '.') { 1155 *p = '/'; 1156 } 1157 p++; 1158 } 1159 1160 const int str_len = (int)(p - str); 1161 if (str_len > Symbol::max_length()) { 1162 // It's impossible to create this class; the name cannot fit 1163 // into the constant pool. 1164 return NULL; 1165 } 1166 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1167 1168 // Security Note: 1169 // The Java level wrapper will perform the necessary security check allowing 1170 // us to pass the NULL as the initiating class loader. 1171 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1172 if (UsePerfData) { 1173 is_lock_held_by_thread(h_loader, 1174 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1175 THREAD); 1176 } 1177 1178 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1179 h_loader, 1180 Handle(), 1181 CHECK_NULL); 1182 #if INCLUDE_CDS 1183 if (k == NULL) { 1184 // If the class is not already loaded, try to see if it's in the shared 1185 // archive for the current classloader (h_loader). 1186 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1187 } 1188 #endif 1189 return (k == NULL) ? NULL : 1190 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1191 JVM_END 1192 1193 // Module support ////////////////////////////////////////////////////////////////////////////// 1194 1195 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1196 jstring location, jobjectArray packages)) 1197 JVMWrapper("JVM_DefineModule"); 1198 Modules::define_module(module, is_open, version, location, packages, CHECK); 1199 JVM_END 1200 1201 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1202 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1203 Modules::set_bootloader_unnamed_module(module, CHECK); 1204 JVM_END 1205 1206 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module)) 1207 JVMWrapper("JVM_AddModuleExports"); 1208 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1209 JVM_END 1210 1211 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package)) 1212 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1213 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1214 JVM_END 1215 1216 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package)) 1217 JVMWrapper("JVM_AddModuleExportsToAll"); 1218 Modules::add_module_exports(from_module, package, NULL, CHECK); 1219 JVM_END 1220 1221 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1222 JVMWrapper("JVM_AddReadsModule"); 1223 Modules::add_reads_module(from_module, source_module, CHECK); 1224 JVM_END 1225 1226 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1227 1228 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1229 assert (cls != NULL, "illegal class"); 1230 JVMWrapper("JVM_InitClassName"); 1231 JvmtiVMObjectAllocEventCollector oam; 1232 ResourceMark rm(THREAD); 1233 HandleMark hm(THREAD); 1234 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1235 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1236 return (jstring) JNIHandles::make_local(env, result); 1237 JVM_END 1238 1239 1240 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1241 JVMWrapper("JVM_GetClassInterfaces"); 1242 JvmtiVMObjectAllocEventCollector oam; 1243 oop mirror = JNIHandles::resolve_non_null(cls); 1244 1245 // Special handling for primitive objects 1246 if (java_lang_Class::is_primitive(mirror)) { 1247 // Primitive objects does not have any interfaces 1248 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1249 return (jobjectArray) JNIHandles::make_local(env, r); 1250 } 1251 1252 Klass* klass = java_lang_Class::as_Klass(mirror); 1253 // Figure size of result array 1254 int size; 1255 if (klass->is_instance_klass()) { 1256 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1257 } else { 1258 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1259 size = 2; 1260 } 1261 1262 // Allocate result array 1263 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1264 objArrayHandle result (THREAD, r); 1265 // Fill in result 1266 if (klass->is_instance_klass()) { 1267 // Regular instance klass, fill in all local interfaces 1268 for (int index = 0; index < size; index++) { 1269 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1270 result->obj_at_put(index, k->java_mirror()); 1271 } 1272 } else { 1273 // All arrays implement java.lang.Cloneable and java.io.Serializable 1274 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1275 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1276 } 1277 return (jobjectArray) JNIHandles::make_local(env, result()); 1278 JVM_END 1279 1280 1281 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1282 JVMWrapper("JVM_IsInterface"); 1283 oop mirror = JNIHandles::resolve_non_null(cls); 1284 if (java_lang_Class::is_primitive(mirror)) { 1285 return JNI_FALSE; 1286 } 1287 Klass* k = java_lang_Class::as_Klass(mirror); 1288 jboolean result = k->is_interface(); 1289 assert(!result || k->is_instance_klass(), 1290 "all interfaces are instance types"); 1291 // The compiler intrinsic for isInterface tests the 1292 // Klass::_access_flags bits in the same way. 1293 return result; 1294 JVM_END 1295 1296 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1297 JVMWrapper("JVM_IsHiddenClass"); 1298 oop mirror = JNIHandles::resolve_non_null(cls); 1299 if (java_lang_Class::is_primitive(mirror)) { 1300 return JNI_FALSE; 1301 } 1302 Klass* k = java_lang_Class::as_Klass(mirror); 1303 return k->is_hidden(); 1304 JVM_END 1305 1306 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1307 JVMWrapper("JVM_GetClassSigners"); 1308 JvmtiVMObjectAllocEventCollector oam; 1309 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1310 // There are no signers for primitive types 1311 return NULL; 1312 } 1313 1314 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls))); 1315 1316 // If there are no signers set in the class, or if the class 1317 // is an array, return NULL. 1318 if (signers == NULL) return NULL; 1319 1320 // copy of the signers array 1321 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1322 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1323 for (int index = 0; index < signers->length(); index++) { 1324 signers_copy->obj_at_put(index, signers->obj_at(index)); 1325 } 1326 1327 // return the copy 1328 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1329 JVM_END 1330 1331 1332 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1333 JVMWrapper("JVM_SetClassSigners"); 1334 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1335 // This call is ignored for primitive types and arrays. 1336 // Signers are only set once, ClassLoader.java, and thus shouldn't 1337 // be called with an array. Only the bootstrap loader creates arrays. 1338 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1339 if (k->is_instance_klass()) { 1340 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1341 } 1342 } 1343 JVM_END 1344 1345 1346 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1347 JVMWrapper("JVM_GetProtectionDomain"); 1348 if (JNIHandles::resolve(cls) == NULL) { 1349 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1350 } 1351 1352 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1353 // Primitive types does not have a protection domain. 1354 return NULL; 1355 } 1356 1357 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1358 return (jobject) JNIHandles::make_local(env, pd); 1359 JVM_END 1360 1361 1362 // Returns the inherited_access_control_context field of the running thread. 1363 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1364 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1365 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1366 return JNIHandles::make_local(env, result); 1367 JVM_END 1368 1369 class RegisterArrayForGC { 1370 private: 1371 JavaThread *_thread; 1372 public: 1373 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1374 _thread = thread; 1375 _thread->register_array_for_gc(array); 1376 } 1377 1378 ~RegisterArrayForGC() { 1379 _thread->register_array_for_gc(NULL); 1380 } 1381 }; 1382 1383 1384 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1385 JVMWrapper("JVM_GetStackAccessControlContext"); 1386 if (!UsePrivilegedStack) return NULL; 1387 1388 ResourceMark rm(THREAD); 1389 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1390 JvmtiVMObjectAllocEventCollector oam; 1391 1392 // count the protection domains on the execution stack. We collapse 1393 // duplicate consecutive protection domains into a single one, as 1394 // well as stopping when we hit a privileged frame. 1395 1396 oop previous_protection_domain = NULL; 1397 Handle privileged_context(thread, NULL); 1398 bool is_privileged = false; 1399 oop protection_domain = NULL; 1400 1401 // Iterate through Java frames 1402 vframeStream vfst(thread); 1403 for(; !vfst.at_end(); vfst.next()) { 1404 // get method of frame 1405 Method* method = vfst.method(); 1406 1407 // stop at the first privileged frame 1408 if (method->method_holder() == SystemDictionary::AccessController_klass() && 1409 method->name() == vmSymbols::executePrivileged_name()) 1410 { 1411 // this frame is privileged 1412 is_privileged = true; 1413 1414 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1415 1416 StackValueCollection* locals = priv->locals(); 1417 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1418 StackValue* clr_sv = locals->at(2); // Class<?> caller 1419 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1420 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1421 privileged_context = ctx_sv->get_obj(); 1422 Handle caller = clr_sv->get_obj(); 1423 1424 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1425 protection_domain = caller_klass->protection_domain(); 1426 } else { 1427 protection_domain = method->method_holder()->protection_domain(); 1428 } 1429 1430 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1431 local_array->push(protection_domain); 1432 previous_protection_domain = protection_domain; 1433 } 1434 1435 if (is_privileged) break; 1436 } 1437 1438 1439 // either all the domains on the stack were system domains, or 1440 // we had a privileged system domain 1441 if (local_array->is_empty()) { 1442 if (is_privileged && privileged_context.is_null()) return NULL; 1443 1444 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1445 return JNIHandles::make_local(env, result); 1446 } 1447 1448 // the resource area must be registered in case of a gc 1449 RegisterArrayForGC ragc(thread, local_array); 1450 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1451 local_array->length(), CHECK_NULL); 1452 objArrayHandle h_context(thread, context); 1453 for (int index = 0; index < local_array->length(); index++) { 1454 h_context->obj_at_put(index, local_array->at(index)); 1455 } 1456 1457 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1458 1459 return JNIHandles::make_local(env, result); 1460 JVM_END 1461 1462 1463 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1464 JVMWrapper("JVM_IsArrayClass"); 1465 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1466 return (k != NULL) && k->is_array_klass() ? true : false; 1467 JVM_END 1468 1469 1470 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1471 JVMWrapper("JVM_IsPrimitiveClass"); 1472 oop mirror = JNIHandles::resolve_non_null(cls); 1473 return (jboolean) java_lang_Class::is_primitive(mirror); 1474 JVM_END 1475 1476 1477 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1478 JVMWrapper("JVM_GetClassModifiers"); 1479 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1480 // Primitive type 1481 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1482 } 1483 1484 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1485 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1486 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1487 return k->modifier_flags(); 1488 JVM_END 1489 1490 1491 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1492 1493 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1494 JvmtiVMObjectAllocEventCollector oam; 1495 // ofClass is a reference to a java_lang_Class object. The mirror object 1496 // of an InstanceKlass 1497 1498 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1499 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1500 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1501 return (jobjectArray)JNIHandles::make_local(env, result); 1502 } 1503 1504 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1505 InnerClassesIterator iter(k); 1506 1507 if (iter.length() == 0) { 1508 // Neither an inner nor outer class 1509 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1510 return (jobjectArray)JNIHandles::make_local(env, result); 1511 } 1512 1513 // find inner class info 1514 constantPoolHandle cp(thread, k->constants()); 1515 int length = iter.length(); 1516 1517 // Allocate temp. result array 1518 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1519 objArrayHandle result (THREAD, r); 1520 int members = 0; 1521 1522 for (; !iter.done(); iter.next()) { 1523 int ioff = iter.inner_class_info_index(); 1524 int ooff = iter.outer_class_info_index(); 1525 1526 if (ioff != 0 && ooff != 0) { 1527 // Check to see if the name matches the class we're looking for 1528 // before attempting to find the class. 1529 if (cp->klass_name_at_matches(k, ooff)) { 1530 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1531 if (outer_klass == k) { 1532 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1533 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1534 1535 // Throws an exception if outer klass has not declared k as 1536 // an inner klass 1537 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1538 1539 result->obj_at_put(members, inner_klass->java_mirror()); 1540 members++; 1541 } 1542 } 1543 } 1544 } 1545 1546 if (members != length) { 1547 // Return array of right length 1548 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1549 for(int i = 0; i < members; i++) { 1550 res->obj_at_put(i, result->obj_at(i)); 1551 } 1552 return (jobjectArray)JNIHandles::make_local(env, res); 1553 } 1554 1555 return (jobjectArray)JNIHandles::make_local(env, result()); 1556 JVM_END 1557 1558 1559 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1560 { 1561 // ofClass is a reference to a java_lang_Class object. 1562 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1563 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1564 return NULL; 1565 } 1566 1567 bool inner_is_member = false; 1568 Klass* outer_klass 1569 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1570 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1571 if (outer_klass == NULL) return NULL; // already a top-level class 1572 if (!inner_is_member) return NULL; // a hidden or unsafe anonymous class (inside a method) 1573 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1574 } 1575 JVM_END 1576 1577 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1578 { 1579 oop mirror = JNIHandles::resolve_non_null(cls); 1580 if (java_lang_Class::is_primitive(mirror) || 1581 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1582 return NULL; 1583 } 1584 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1585 int ooff = 0, noff = 0; 1586 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1587 if (noff != 0) { 1588 constantPoolHandle i_cp(thread, k->constants()); 1589 Symbol* name = i_cp->symbol_at(noff); 1590 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1591 return (jstring) JNIHandles::make_local(env, str()); 1592 } 1593 } 1594 return NULL; 1595 } 1596 JVM_END 1597 1598 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1599 assert (cls != NULL, "illegal class"); 1600 JVMWrapper("JVM_GetClassSignature"); 1601 JvmtiVMObjectAllocEventCollector oam; 1602 ResourceMark rm(THREAD); 1603 // Return null for arrays and primatives 1604 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1605 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1606 if (k->is_instance_klass()) { 1607 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1608 if (sym == NULL) return NULL; 1609 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1610 return (jstring) JNIHandles::make_local(env, str()); 1611 } 1612 } 1613 return NULL; 1614 JVM_END 1615 1616 1617 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1618 assert (cls != NULL, "illegal class"); 1619 JVMWrapper("JVM_GetClassAnnotations"); 1620 1621 // Return null for arrays and primitives 1622 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1623 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1624 if (k->is_instance_klass()) { 1625 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1626 return (jbyteArray) JNIHandles::make_local(env, a); 1627 } 1628 } 1629 return NULL; 1630 JVM_END 1631 1632 1633 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1634 // some of this code was adapted from from jni_FromReflectedField 1635 1636 oop reflected = JNIHandles::resolve_non_null(field); 1637 oop mirror = java_lang_reflect_Field::clazz(reflected); 1638 Klass* k = java_lang_Class::as_Klass(mirror); 1639 int slot = java_lang_reflect_Field::slot(reflected); 1640 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1641 1642 InstanceKlass* ik = InstanceKlass::cast(k); 1643 intptr_t offset = ik->field_offset(slot); 1644 1645 if (modifiers & JVM_ACC_STATIC) { 1646 // for static fields we only look in the current class 1647 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1648 assert(false, "cannot find static field"); 1649 return false; 1650 } 1651 } else { 1652 // for instance fields we start with the current class and work 1653 // our way up through the superclass chain 1654 if (!ik->find_field_from_offset(offset, false, &fd)) { 1655 assert(false, "cannot find instance field"); 1656 return false; 1657 } 1658 } 1659 return true; 1660 } 1661 1662 static Method* jvm_get_method_common(jobject method) { 1663 // some of this code was adapted from from jni_FromReflectedMethod 1664 1665 oop reflected = JNIHandles::resolve_non_null(method); 1666 oop mirror = NULL; 1667 int slot = 0; 1668 1669 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1670 mirror = java_lang_reflect_Constructor::clazz(reflected); 1671 slot = java_lang_reflect_Constructor::slot(reflected); 1672 } else { 1673 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1674 "wrong type"); 1675 mirror = java_lang_reflect_Method::clazz(reflected); 1676 slot = java_lang_reflect_Method::slot(reflected); 1677 } 1678 Klass* k = java_lang_Class::as_Klass(mirror); 1679 1680 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1681 assert(m != NULL, "cannot find method"); 1682 return m; // caller has to deal with NULL in product mode 1683 } 1684 1685 /* Type use annotations support (JDK 1.8) */ 1686 1687 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1688 assert (cls != NULL, "illegal class"); 1689 JVMWrapper("JVM_GetClassTypeAnnotations"); 1690 ResourceMark rm(THREAD); 1691 // Return null for arrays and primitives 1692 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1693 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1694 if (k->is_instance_klass()) { 1695 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1696 if (type_annotations != NULL) { 1697 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1698 return (jbyteArray) JNIHandles::make_local(env, a); 1699 } 1700 } 1701 } 1702 return NULL; 1703 JVM_END 1704 1705 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1706 assert (method != NULL, "illegal method"); 1707 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1708 1709 // method is a handle to a java.lang.reflect.Method object 1710 Method* m = jvm_get_method_common(method); 1711 if (m == NULL) { 1712 return NULL; 1713 } 1714 1715 AnnotationArray* type_annotations = m->type_annotations(); 1716 if (type_annotations != NULL) { 1717 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1718 return (jbyteArray) JNIHandles::make_local(env, a); 1719 } 1720 1721 return NULL; 1722 JVM_END 1723 1724 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1725 assert (field != NULL, "illegal field"); 1726 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1727 1728 fieldDescriptor fd; 1729 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1730 if (!gotFd) { 1731 return NULL; 1732 } 1733 1734 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1735 JVM_END 1736 1737 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1738 if (!cp->is_within_bounds(index)) { 1739 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1740 } 1741 } 1742 1743 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1744 { 1745 JVMWrapper("JVM_GetMethodParameters"); 1746 // method is a handle to a java.lang.reflect.Method object 1747 Method* method_ptr = jvm_get_method_common(method); 1748 methodHandle mh (THREAD, method_ptr); 1749 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1750 const int num_params = mh->method_parameters_length(); 1751 1752 if (num_params < 0) { 1753 // A -1 return value from method_parameters_length means there is no 1754 // parameter data. Return null to indicate this to the reflection 1755 // API. 1756 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1757 return (jobjectArray)NULL; 1758 } else { 1759 // Otherwise, we return something up to reflection, even if it is 1760 // a zero-length array. Why? Because in some cases this can 1761 // trigger a MalformedParametersException. 1762 1763 // make sure all the symbols are properly formatted 1764 for (int i = 0; i < num_params; i++) { 1765 MethodParametersElement* params = mh->method_parameters_start(); 1766 int index = params[i].name_cp_index; 1767 constantPoolHandle cp(THREAD, mh->constants()); 1768 bounds_check(cp, index, CHECK_NULL); 1769 1770 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1771 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1772 "Wrong type at constant pool index"); 1773 } 1774 1775 } 1776 1777 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1778 objArrayHandle result (THREAD, result_oop); 1779 1780 for (int i = 0; i < num_params; i++) { 1781 MethodParametersElement* params = mh->method_parameters_start(); 1782 // For a 0 index, give a NULL symbol 1783 Symbol* sym = 0 != params[i].name_cp_index ? 1784 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1785 int flags = params[i].flags; 1786 oop param = Reflection::new_parameter(reflected_method, i, sym, 1787 flags, CHECK_NULL); 1788 result->obj_at_put(i, param); 1789 } 1790 return (jobjectArray)JNIHandles::make_local(env, result()); 1791 } 1792 } 1793 JVM_END 1794 1795 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1796 1797 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1798 { 1799 JVMWrapper("JVM_GetClassDeclaredFields"); 1800 JvmtiVMObjectAllocEventCollector oam; 1801 1802 // Exclude primitive types and array types 1803 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1804 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1805 // Return empty array 1806 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1807 return (jobjectArray) JNIHandles::make_local(env, res); 1808 } 1809 1810 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1811 constantPoolHandle cp(THREAD, k->constants()); 1812 1813 // Ensure class is linked 1814 k->link_class(CHECK_NULL); 1815 1816 // Allocate result 1817 int num_fields; 1818 1819 if (publicOnly) { 1820 num_fields = 0; 1821 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1822 if (fs.access_flags().is_public()) ++num_fields; 1823 } 1824 } else { 1825 num_fields = k->java_fields_count(); 1826 } 1827 1828 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1829 objArrayHandle result (THREAD, r); 1830 1831 int out_idx = 0; 1832 fieldDescriptor fd; 1833 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1834 if (!publicOnly || fs.access_flags().is_public()) { 1835 fd.reinitialize(k, fs.index()); 1836 oop field = Reflection::new_field(&fd, CHECK_NULL); 1837 result->obj_at_put(out_idx, field); 1838 ++out_idx; 1839 } 1840 } 1841 assert(out_idx == num_fields, "just checking"); 1842 return (jobjectArray) JNIHandles::make_local(env, result()); 1843 } 1844 JVM_END 1845 1846 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1847 { 1848 JVMWrapper("JVM_IsRecord"); 1849 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1850 if (k != NULL && k->is_instance_klass()) { 1851 InstanceKlass* ik = InstanceKlass::cast(k); 1852 return ik->is_record(); 1853 } else { 1854 return false; 1855 } 1856 } 1857 JVM_END 1858 1859 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1860 { 1861 JVMWrapper("JVM_GetRecordComponents"); 1862 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1863 assert(c->is_instance_klass(), "must be"); 1864 InstanceKlass* ik = InstanceKlass::cast(c); 1865 1866 if (ik->is_record()) { 1867 Array<RecordComponent*>* components = ik->record_components(); 1868 assert(components != NULL, "components should not be NULL"); 1869 { 1870 JvmtiVMObjectAllocEventCollector oam; 1871 constantPoolHandle cp(THREAD, ik->constants()); 1872 int length = components->length(); 1873 assert(length >= 0, "unexpected record_components length"); 1874 objArrayOop record_components = 1875 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL); 1876 objArrayHandle components_h (THREAD, record_components); 1877 1878 for (int x = 0; x < length; x++) { 1879 RecordComponent* component = components->at(x); 1880 assert(component != NULL, "unexpected NULL record component"); 1881 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1882 components_h->obj_at_put(x, component_oop); 1883 } 1884 return (jobjectArray)JNIHandles::make_local(components_h()); 1885 } 1886 } 1887 1888 // Return empty array if ofClass is not a record. 1889 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL); 1890 return (jobjectArray)JNIHandles::make_local(env, result); 1891 } 1892 JVM_END 1893 1894 static bool select_method(const methodHandle& method, bool want_constructor) { 1895 if (want_constructor) { 1896 return (method->is_initializer() && !method->is_static()); 1897 } else { 1898 return (!method->is_initializer() && !method->is_overpass()); 1899 } 1900 } 1901 1902 static jobjectArray get_class_declared_methods_helper( 1903 JNIEnv *env, 1904 jclass ofClass, jboolean publicOnly, 1905 bool want_constructor, 1906 Klass* klass, TRAPS) { 1907 1908 JvmtiVMObjectAllocEventCollector oam; 1909 1910 // Exclude primitive types and array types 1911 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1912 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1913 // Return empty array 1914 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1915 return (jobjectArray) JNIHandles::make_local(env, res); 1916 } 1917 1918 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1919 1920 // Ensure class is linked 1921 k->link_class(CHECK_NULL); 1922 1923 Array<Method*>* methods = k->methods(); 1924 int methods_length = methods->length(); 1925 1926 // Save original method_idnum in case of redefinition, which can change 1927 // the idnum of obsolete methods. The new method will have the same idnum 1928 // but if we refresh the methods array, the counts will be wrong. 1929 ResourceMark rm(THREAD); 1930 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1931 int num_methods = 0; 1932 1933 for (int i = 0; i < methods_length; i++) { 1934 methodHandle method(THREAD, methods->at(i)); 1935 if (select_method(method, want_constructor)) { 1936 if (!publicOnly || method->is_public()) { 1937 idnums->push(method->method_idnum()); 1938 ++num_methods; 1939 } 1940 } 1941 } 1942 1943 // Allocate result 1944 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1945 objArrayHandle result (THREAD, r); 1946 1947 // Now just put the methods that we selected above, but go by their idnum 1948 // in case of redefinition. The methods can be redefined at any safepoint, 1949 // so above when allocating the oop array and below when creating reflect 1950 // objects. 1951 for (int i = 0; i < num_methods; i++) { 1952 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1953 if (method.is_null()) { 1954 // Method may have been deleted and seems this API can handle null 1955 // Otherwise should probably put a method that throws NSME 1956 result->obj_at_put(i, NULL); 1957 } else { 1958 oop m; 1959 if (want_constructor) { 1960 m = Reflection::new_constructor(method, CHECK_NULL); 1961 } else { 1962 m = Reflection::new_method(method, false, CHECK_NULL); 1963 } 1964 result->obj_at_put(i, m); 1965 } 1966 } 1967 1968 return (jobjectArray) JNIHandles::make_local(env, result()); 1969 } 1970 1971 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1972 { 1973 JVMWrapper("JVM_GetClassDeclaredMethods"); 1974 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1975 /*want_constructor*/ false, 1976 SystemDictionary::reflect_Method_klass(), THREAD); 1977 } 1978 JVM_END 1979 1980 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1981 { 1982 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1983 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1984 /*want_constructor*/ true, 1985 SystemDictionary::reflect_Constructor_klass(), THREAD); 1986 } 1987 JVM_END 1988 1989 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1990 { 1991 JVMWrapper("JVM_GetClassAccessFlags"); 1992 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1993 // Primitive type 1994 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1995 } 1996 1997 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1998 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1999 } 2000 JVM_END 2001 2002 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 2003 { 2004 JVMWrapper("JVM_AreNestMates"); 2005 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2006 assert(c->is_instance_klass(), "must be"); 2007 InstanceKlass* ck = InstanceKlass::cast(c); 2008 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 2009 assert(m->is_instance_klass(), "must be"); 2010 InstanceKlass* mk = InstanceKlass::cast(m); 2011 return ck->has_nestmate_access_to(mk, THREAD); 2012 } 2013 JVM_END 2014 2015 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 2016 { 2017 // current is not a primitive or array class 2018 JVMWrapper("JVM_GetNestHost"); 2019 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2020 assert(c->is_instance_klass(), "must be"); 2021 InstanceKlass* ck = InstanceKlass::cast(c); 2022 InstanceKlass* host = ck->nest_host(THREAD); 2023 return (jclass) (host == NULL ? NULL : 2024 JNIHandles::make_local(THREAD, host->java_mirror())); 2025 } 2026 JVM_END 2027 2028 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 2029 { 2030 // current is not a primitive or array class 2031 JVMWrapper("JVM_GetNestMembers"); 2032 ResourceMark rm(THREAD); 2033 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2034 assert(c->is_instance_klass(), "must be"); 2035 InstanceKlass* ck = InstanceKlass::cast(c); 2036 InstanceKlass* host = ck->nest_host(THREAD); 2037 2038 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 2039 ck->external_name(), host->external_name()); 2040 { 2041 JvmtiVMObjectAllocEventCollector oam; 2042 Array<u2>* members = host->nest_members(); 2043 int length = members == NULL ? 0 : members->length(); 2044 2045 log_trace(class, nestmates)(" - host has %d listed nest members", length); 2046 2047 // nest host is first in the array so make it one bigger 2048 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 2049 length + 1, CHECK_NULL); 2050 objArrayHandle result(THREAD, r); 2051 result->obj_at_put(0, host->java_mirror()); 2052 if (length != 0) { 2053 int count = 0; 2054 for (int i = 0; i < length; i++) { 2055 int cp_index = members->at(i); 2056 Klass* k = host->constants()->klass_at(cp_index, THREAD); 2057 if (HAS_PENDING_EXCEPTION) { 2058 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) { 2059 return NULL; // propagate VMEs 2060 } 2061 if (log_is_enabled(Trace, class, nestmates)) { 2062 stringStream ss; 2063 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2064 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2065 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2066 log_trace(class, nestmates)("%s", ss.as_string()); 2067 } 2068 CLEAR_PENDING_EXCEPTION; 2069 continue; 2070 } 2071 if (k->is_instance_klass()) { 2072 InstanceKlass* ik = InstanceKlass::cast(k); 2073 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2074 if (nest_host_k == host) { 2075 result->obj_at_put(count+1, k->java_mirror()); 2076 count++; 2077 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2078 } else { 2079 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2080 ik->external_name(), nest_host_k->external_name()); 2081 } 2082 } else { 2083 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2084 k->external_name()); 2085 } 2086 } 2087 if (count < length) { 2088 // we had invalid entries so we need to compact the array 2089 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2090 length + 1, count + 1); 2091 2092 objArrayOop r2 = oopFactory::new_objArray(SystemDictionary::Class_klass(), 2093 count + 1, CHECK_NULL); 2094 objArrayHandle result2(THREAD, r2); 2095 for (int i = 0; i < count + 1; i++) { 2096 result2->obj_at_put(i, result->obj_at(i)); 2097 } 2098 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2099 } 2100 } 2101 else { 2102 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate"); 2103 } 2104 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2105 } 2106 } 2107 JVM_END 2108 2109 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current)) 2110 { 2111 JVMWrapper("JVM_GetPermittedSubclasses"); 2112 assert(!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(current)), "should not be"); 2113 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2114 assert(c->is_instance_klass(), "must be"); 2115 InstanceKlass* ik = InstanceKlass::cast(c); 2116 { 2117 JvmtiVMObjectAllocEventCollector oam; 2118 Array<u2>* subclasses = ik->permitted_subclasses(); 2119 int length = subclasses == NULL ? 0 : subclasses->length(); 2120 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 2121 length, CHECK_NULL); 2122 objArrayHandle result(THREAD, r); 2123 for (int i = 0; i < length; i++) { 2124 int cp_index = subclasses->at(i); 2125 // This returns <package-name>/<class-name>. 2126 Symbol* klass_name = ik->constants()->klass_name_at(cp_index); 2127 assert(klass_name != NULL, "Unexpected null klass_name"); 2128 Handle perm_subtype_h = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2129 result->obj_at_put(i, perm_subtype_h()); 2130 } 2131 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2132 } 2133 } 2134 JVM_END 2135 2136 // Constant pool access ////////////////////////////////////////////////////////// 2137 2138 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2139 { 2140 JVMWrapper("JVM_GetClassConstantPool"); 2141 JvmtiVMObjectAllocEventCollector oam; 2142 2143 // Return null for primitives and arrays 2144 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 2145 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2146 if (k->is_instance_klass()) { 2147 InstanceKlass* k_h = InstanceKlass::cast(k); 2148 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2149 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2150 return JNIHandles::make_local(jcp()); 2151 } 2152 } 2153 return NULL; 2154 } 2155 JVM_END 2156 2157 2158 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2159 { 2160 JVMWrapper("JVM_ConstantPoolGetSize"); 2161 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2162 return cp->length(); 2163 } 2164 JVM_END 2165 2166 2167 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2168 { 2169 JVMWrapper("JVM_ConstantPoolGetClassAt"); 2170 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2171 bounds_check(cp, index, CHECK_NULL); 2172 constantTag tag = cp->tag_at(index); 2173 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2174 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2175 } 2176 Klass* k = cp->klass_at(index, CHECK_NULL); 2177 return (jclass) JNIHandles::make_local(k->java_mirror()); 2178 } 2179 JVM_END 2180 2181 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2182 { 2183 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 2184 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2185 bounds_check(cp, index, CHECK_NULL); 2186 constantTag tag = cp->tag_at(index); 2187 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2188 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2189 } 2190 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2191 if (k == NULL) return NULL; 2192 return (jclass) JNIHandles::make_local(k->java_mirror()); 2193 } 2194 JVM_END 2195 2196 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2197 constantTag tag = cp->tag_at(index); 2198 if (!tag.is_method() && !tag.is_interface_method()) { 2199 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2200 } 2201 int klass_ref = cp->uncached_klass_ref_index_at(index); 2202 Klass* k_o; 2203 if (force_resolution) { 2204 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2205 } else { 2206 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2207 if (k_o == NULL) return NULL; 2208 } 2209 InstanceKlass* k = InstanceKlass::cast(k_o); 2210 Symbol* name = cp->uncached_name_ref_at(index); 2211 Symbol* sig = cp->uncached_signature_ref_at(index); 2212 methodHandle m (THREAD, k->find_method(name, sig)); 2213 if (m.is_null()) { 2214 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2215 } 2216 oop method; 2217 if (!m->is_initializer() || m->is_static()) { 2218 method = Reflection::new_method(m, true, CHECK_NULL); 2219 } else { 2220 method = Reflection::new_constructor(m, CHECK_NULL); 2221 } 2222 return JNIHandles::make_local(method); 2223 } 2224 2225 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2226 { 2227 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 2228 JvmtiVMObjectAllocEventCollector oam; 2229 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2230 bounds_check(cp, index, CHECK_NULL); 2231 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2232 return res; 2233 } 2234 JVM_END 2235 2236 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2237 { 2238 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2239 JvmtiVMObjectAllocEventCollector oam; 2240 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2241 bounds_check(cp, index, CHECK_NULL); 2242 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2243 return res; 2244 } 2245 JVM_END 2246 2247 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2248 constantTag tag = cp->tag_at(index); 2249 if (!tag.is_field()) { 2250 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2251 } 2252 int klass_ref = cp->uncached_klass_ref_index_at(index); 2253 Klass* k_o; 2254 if (force_resolution) { 2255 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2256 } else { 2257 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2258 if (k_o == NULL) return NULL; 2259 } 2260 InstanceKlass* k = InstanceKlass::cast(k_o); 2261 Symbol* name = cp->uncached_name_ref_at(index); 2262 Symbol* sig = cp->uncached_signature_ref_at(index); 2263 fieldDescriptor fd; 2264 Klass* target_klass = k->find_field(name, sig, &fd); 2265 if (target_klass == NULL) { 2266 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2267 } 2268 oop field = Reflection::new_field(&fd, CHECK_NULL); 2269 return JNIHandles::make_local(field); 2270 } 2271 2272 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2273 { 2274 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2275 JvmtiVMObjectAllocEventCollector oam; 2276 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2277 bounds_check(cp, index, CHECK_NULL); 2278 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2279 return res; 2280 } 2281 JVM_END 2282 2283 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2284 { 2285 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2286 JvmtiVMObjectAllocEventCollector oam; 2287 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2288 bounds_check(cp, index, CHECK_NULL); 2289 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2290 return res; 2291 } 2292 JVM_END 2293 2294 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2295 { 2296 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2297 JvmtiVMObjectAllocEventCollector oam; 2298 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2299 bounds_check(cp, index, CHECK_NULL); 2300 constantTag tag = cp->tag_at(index); 2301 if (!tag.is_field_or_method()) { 2302 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2303 } 2304 int klass_ref = cp->uncached_klass_ref_index_at(index); 2305 Symbol* klass_name = cp->klass_name_at(klass_ref); 2306 Symbol* member_name = cp->uncached_name_ref_at(index); 2307 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2308 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2309 objArrayHandle dest(THREAD, dest_o); 2310 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2311 dest->obj_at_put(0, str()); 2312 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2313 dest->obj_at_put(1, str()); 2314 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2315 dest->obj_at_put(2, str()); 2316 return (jobjectArray) JNIHandles::make_local(dest()); 2317 } 2318 JVM_END 2319 2320 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2321 { 2322 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2323 JvmtiVMObjectAllocEventCollector oam; 2324 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2325 bounds_check(cp, index, CHECK_0); 2326 constantTag tag = cp->tag_at(index); 2327 if (!tag.is_field_or_method()) { 2328 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2329 } 2330 return (jint) cp->uncached_klass_ref_index_at(index); 2331 } 2332 JVM_END 2333 2334 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2335 { 2336 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2337 JvmtiVMObjectAllocEventCollector oam; 2338 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2339 bounds_check(cp, index, CHECK_0); 2340 constantTag tag = cp->tag_at(index); 2341 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2342 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2343 } 2344 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2345 } 2346 JVM_END 2347 2348 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2349 { 2350 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2351 JvmtiVMObjectAllocEventCollector oam; 2352 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2353 bounds_check(cp, index, CHECK_NULL); 2354 constantTag tag = cp->tag_at(index); 2355 if (!tag.is_name_and_type()) { 2356 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2357 } 2358 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2359 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2360 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2361 objArrayHandle dest(THREAD, dest_o); 2362 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2363 dest->obj_at_put(0, str()); 2364 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2365 dest->obj_at_put(1, str()); 2366 return (jobjectArray) JNIHandles::make_local(dest()); 2367 } 2368 JVM_END 2369 2370 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2371 { 2372 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2373 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2374 bounds_check(cp, index, CHECK_0); 2375 constantTag tag = cp->tag_at(index); 2376 if (!tag.is_int()) { 2377 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2378 } 2379 return cp->int_at(index); 2380 } 2381 JVM_END 2382 2383 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2384 { 2385 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2386 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2387 bounds_check(cp, index, CHECK_(0L)); 2388 constantTag tag = cp->tag_at(index); 2389 if (!tag.is_long()) { 2390 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2391 } 2392 return cp->long_at(index); 2393 } 2394 JVM_END 2395 2396 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2397 { 2398 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2399 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2400 bounds_check(cp, index, CHECK_(0.0f)); 2401 constantTag tag = cp->tag_at(index); 2402 if (!tag.is_float()) { 2403 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2404 } 2405 return cp->float_at(index); 2406 } 2407 JVM_END 2408 2409 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2410 { 2411 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2412 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2413 bounds_check(cp, index, CHECK_(0.0)); 2414 constantTag tag = cp->tag_at(index); 2415 if (!tag.is_double()) { 2416 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2417 } 2418 return cp->double_at(index); 2419 } 2420 JVM_END 2421 2422 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2423 { 2424 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2425 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2426 bounds_check(cp, index, CHECK_NULL); 2427 constantTag tag = cp->tag_at(index); 2428 if (!tag.is_string()) { 2429 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2430 } 2431 oop str = cp->string_at(index, CHECK_NULL); 2432 return (jstring) JNIHandles::make_local(str); 2433 } 2434 JVM_END 2435 2436 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2437 { 2438 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2439 JvmtiVMObjectAllocEventCollector oam; 2440 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2441 bounds_check(cp, index, CHECK_NULL); 2442 constantTag tag = cp->tag_at(index); 2443 if (!tag.is_symbol()) { 2444 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2445 } 2446 Symbol* sym = cp->symbol_at(index); 2447 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2448 return (jstring) JNIHandles::make_local(str()); 2449 } 2450 JVM_END 2451 2452 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2453 { 2454 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2455 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2456 bounds_check(cp, index, CHECK_0); 2457 constantTag tag = cp->tag_at(index); 2458 jbyte result = tag.value(); 2459 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2460 // they are changed to the corresponding tags from the JVM spec, so that java code in 2461 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2462 if (tag.is_klass_or_reference()) { 2463 result = JVM_CONSTANT_Class; 2464 } else if (tag.is_string_index()) { 2465 result = JVM_CONSTANT_String; 2466 } else if (tag.is_method_type_in_error()) { 2467 result = JVM_CONSTANT_MethodType; 2468 } else if (tag.is_method_handle_in_error()) { 2469 result = JVM_CONSTANT_MethodHandle; 2470 } else if (tag.is_dynamic_constant_in_error()) { 2471 result = JVM_CONSTANT_Dynamic; 2472 } 2473 return result; 2474 } 2475 JVM_END 2476 2477 // Assertion support. ////////////////////////////////////////////////////////// 2478 2479 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2480 JVMWrapper("JVM_DesiredAssertionStatus"); 2481 assert(cls != NULL, "bad class"); 2482 2483 oop r = JNIHandles::resolve(cls); 2484 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2485 if (java_lang_Class::is_primitive(r)) return false; 2486 2487 Klass* k = java_lang_Class::as_Klass(r); 2488 assert(k->is_instance_klass(), "must be an instance klass"); 2489 if (!k->is_instance_klass()) return false; 2490 2491 ResourceMark rm(THREAD); 2492 const char* name = k->name()->as_C_string(); 2493 bool system_class = k->class_loader() == NULL; 2494 return JavaAssertions::enabled(name, system_class); 2495 2496 JVM_END 2497 2498 2499 // Return a new AssertionStatusDirectives object with the fields filled in with 2500 // command-line assertion arguments (i.e., -ea, -da). 2501 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2502 JVMWrapper("JVM_AssertionStatusDirectives"); 2503 JvmtiVMObjectAllocEventCollector oam; 2504 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2505 return JNIHandles::make_local(env, asd); 2506 JVM_END 2507 2508 // Verification //////////////////////////////////////////////////////////////////////////////// 2509 2510 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2511 2512 // RedefineClasses support: bug 6214132 caused verification to fail. 2513 // All functions from this section should call the jvmtiThreadSate function: 2514 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2515 // The function returns a Klass* of the _scratch_class if the verifier 2516 // was invoked in the middle of the class redefinition. 2517 // Otherwise it returns its argument value which is the _the_class Klass*. 2518 // Please, refer to the description in the jvmtiThreadSate.hpp. 2519 2520 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2521 JVMWrapper("JVM_GetClassNameUTF"); 2522 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2523 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2524 return k->name()->as_utf8(); 2525 JVM_END 2526 2527 2528 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2529 JVMWrapper("JVM_GetClassCPTypes"); 2530 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2531 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2532 // types will have length zero if this is not an InstanceKlass 2533 // (length is determined by call to JVM_GetClassCPEntriesCount) 2534 if (k->is_instance_klass()) { 2535 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2536 for (int index = cp->length() - 1; index >= 0; index--) { 2537 constantTag tag = cp->tag_at(index); 2538 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2539 } 2540 } 2541 JVM_END 2542 2543 2544 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2545 JVMWrapper("JVM_GetClassCPEntriesCount"); 2546 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2547 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2548 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2549 JVM_END 2550 2551 2552 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2553 JVMWrapper("JVM_GetClassFieldsCount"); 2554 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2555 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2556 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2557 JVM_END 2558 2559 2560 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2561 JVMWrapper("JVM_GetClassMethodsCount"); 2562 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2563 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2564 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2565 JVM_END 2566 2567 2568 // The following methods, used for the verifier, are never called with 2569 // array klasses, so a direct cast to InstanceKlass is safe. 2570 // Typically, these methods are called in a loop with bounds determined 2571 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2572 // zero for arrays. 2573 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2574 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2575 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2576 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2577 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2578 int length = method->checked_exceptions_length(); 2579 if (length > 0) { 2580 CheckedExceptionElement* table= method->checked_exceptions_start(); 2581 for (int i = 0; i < length; i++) { 2582 exceptions[i] = table[i].class_cp_index; 2583 } 2584 } 2585 JVM_END 2586 2587 2588 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2589 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2590 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2591 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2592 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2593 return method->checked_exceptions_length(); 2594 JVM_END 2595 2596 2597 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2598 JVMWrapper("JVM_GetMethodIxByteCode"); 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 memcpy(code, method->code_base(), method->code_size()); 2603 JVM_END 2604 2605 2606 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2607 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 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 return method->code_size(); 2612 JVM_END 2613 2614 2615 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2616 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 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 ExceptionTable extable(method); 2621 entry->start_pc = extable.start_pc(entry_index); 2622 entry->end_pc = extable.end_pc(entry_index); 2623 entry->handler_pc = extable.handler_pc(entry_index); 2624 entry->catchType = extable.catch_type_index(entry_index); 2625 JVM_END 2626 2627 2628 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2629 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2630 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2631 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2632 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2633 return method->exception_table_length(); 2634 JVM_END 2635 2636 2637 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2638 JVMWrapper("JVM_GetMethodIxModifiers"); 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->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2643 JVM_END 2644 2645 2646 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2647 JVMWrapper("JVM_GetFieldIxModifiers"); 2648 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2649 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2650 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2651 JVM_END 2652 2653 2654 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2655 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2656 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2657 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2658 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2659 return method->max_locals(); 2660 JVM_END 2661 2662 2663 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2664 JVMWrapper("JVM_GetMethodIxArgsSize"); 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->size_of_parameters(); 2669 JVM_END 2670 2671 2672 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2673 JVMWrapper("JVM_GetMethodIxMaxStack"); 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->verifier_max_stack(); 2678 JVM_END 2679 2680 2681 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2682 JVMWrapper("JVM_IsConstructorIx"); 2683 ResourceMark rm(THREAD); 2684 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2685 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2686 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2687 return method->name() == vmSymbols::object_initializer_name(); 2688 JVM_END 2689 2690 2691 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2692 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2693 ResourceMark rm(THREAD); 2694 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2695 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2696 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2697 return method->is_overpass(); 2698 JVM_END 2699 2700 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2701 JVMWrapper("JVM_GetMethodIxIxUTF"); 2702 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2703 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2704 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2705 return method->name()->as_utf8(); 2706 JVM_END 2707 2708 2709 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2710 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 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->signature()->as_utf8(); 2715 JVM_END 2716 2717 /** 2718 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2719 * read entries in the constant pool. Since the old verifier always 2720 * works on a copy of the code, it will not see any rewriting that 2721 * may possibly occur in the middle of verification. So it is important 2722 * that nothing it calls tries to use the cpCache instead of the raw 2723 * constant pool, so we must use cp->uncached_x methods when appropriate. 2724 */ 2725 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2726 JVMWrapper("JVM_GetCPFieldNameUTF"); 2727 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2728 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2729 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2730 switch (cp->tag_at(cp_index).value()) { 2731 case JVM_CONSTANT_Fieldref: 2732 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2733 default: 2734 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2735 } 2736 ShouldNotReachHere(); 2737 return NULL; 2738 JVM_END 2739 2740 2741 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2742 JVMWrapper("JVM_GetCPMethodNameUTF"); 2743 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2744 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2745 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2746 switch (cp->tag_at(cp_index).value()) { 2747 case JVM_CONSTANT_InterfaceMethodref: 2748 case JVM_CONSTANT_Methodref: 2749 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2750 default: 2751 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2752 } 2753 ShouldNotReachHere(); 2754 return NULL; 2755 JVM_END 2756 2757 2758 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2759 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2760 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2761 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2762 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2763 switch (cp->tag_at(cp_index).value()) { 2764 case JVM_CONSTANT_InterfaceMethodref: 2765 case JVM_CONSTANT_Methodref: 2766 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2767 default: 2768 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2769 } 2770 ShouldNotReachHere(); 2771 return NULL; 2772 JVM_END 2773 2774 2775 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2776 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2777 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2778 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2779 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2780 switch (cp->tag_at(cp_index).value()) { 2781 case JVM_CONSTANT_Fieldref: 2782 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2783 default: 2784 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2785 } 2786 ShouldNotReachHere(); 2787 return NULL; 2788 JVM_END 2789 2790 2791 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2792 JVMWrapper("JVM_GetCPClassNameUTF"); 2793 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2794 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2795 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2796 Symbol* classname = cp->klass_name_at(cp_index); 2797 return classname->as_utf8(); 2798 JVM_END 2799 2800 2801 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2802 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2803 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2804 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2805 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2806 switch (cp->tag_at(cp_index).value()) { 2807 case JVM_CONSTANT_Fieldref: { 2808 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2809 Symbol* classname = cp->klass_name_at(class_index); 2810 return classname->as_utf8(); 2811 } 2812 default: 2813 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2814 } 2815 ShouldNotReachHere(); 2816 return NULL; 2817 JVM_END 2818 2819 2820 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2821 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2822 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2823 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2824 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2825 switch (cp->tag_at(cp_index).value()) { 2826 case JVM_CONSTANT_Methodref: 2827 case JVM_CONSTANT_InterfaceMethodref: { 2828 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2829 Symbol* classname = cp->klass_name_at(class_index); 2830 return classname->as_utf8(); 2831 } 2832 default: 2833 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2834 } 2835 ShouldNotReachHere(); 2836 return NULL; 2837 JVM_END 2838 2839 2840 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2841 JVMWrapper("JVM_GetCPFieldModifiers"); 2842 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2843 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2844 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2845 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2846 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2847 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2848 switch (cp->tag_at(cp_index).value()) { 2849 case JVM_CONSTANT_Fieldref: { 2850 Symbol* name = cp->uncached_name_ref_at(cp_index); 2851 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2852 InstanceKlass* ik = InstanceKlass::cast(k_called); 2853 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2854 if (fs.name() == name && fs.signature() == signature) { 2855 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2856 } 2857 } 2858 return -1; 2859 } 2860 default: 2861 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2862 } 2863 ShouldNotReachHere(); 2864 return 0; 2865 JVM_END 2866 2867 2868 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2869 JVMWrapper("JVM_GetCPMethodModifiers"); 2870 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2871 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2872 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2873 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2874 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2875 switch (cp->tag_at(cp_index).value()) { 2876 case JVM_CONSTANT_Methodref: 2877 case JVM_CONSTANT_InterfaceMethodref: { 2878 Symbol* name = cp->uncached_name_ref_at(cp_index); 2879 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2880 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2881 int methods_count = methods->length(); 2882 for (int i = 0; i < methods_count; i++) { 2883 Method* method = methods->at(i); 2884 if (method->name() == name && method->signature() == signature) { 2885 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2886 } 2887 } 2888 return -1; 2889 } 2890 default: 2891 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2892 } 2893 ShouldNotReachHere(); 2894 return 0; 2895 JVM_END 2896 2897 2898 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2899 2900 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2901 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2902 JVM_END 2903 2904 2905 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2906 JVMWrapper("JVM_IsSameClassPackage"); 2907 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2908 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2909 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2910 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2911 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2912 JVM_END 2913 2914 // Printing support ////////////////////////////////////////////////// 2915 extern "C" { 2916 2917 ATTRIBUTE_PRINTF(3, 0) 2918 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2919 // Reject count values that are negative signed values converted to 2920 // unsigned; see bug 4399518, 4417214 2921 if ((intptr_t)count <= 0) return -1; 2922 2923 int result = os::vsnprintf(str, count, fmt, args); 2924 if (result > 0 && (size_t)result >= count) { 2925 result = -1; 2926 } 2927 2928 return result; 2929 } 2930 2931 ATTRIBUTE_PRINTF(3, 4) 2932 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2933 va_list args; 2934 int len; 2935 va_start(args, fmt); 2936 len = jio_vsnprintf(str, count, fmt, args); 2937 va_end(args); 2938 return len; 2939 } 2940 2941 ATTRIBUTE_PRINTF(2, 3) 2942 int jio_fprintf(FILE* f, const char *fmt, ...) { 2943 int len; 2944 va_list args; 2945 va_start(args, fmt); 2946 len = jio_vfprintf(f, fmt, args); 2947 va_end(args); 2948 return len; 2949 } 2950 2951 ATTRIBUTE_PRINTF(2, 0) 2952 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2953 if (Arguments::vfprintf_hook() != NULL) { 2954 return Arguments::vfprintf_hook()(f, fmt, args); 2955 } else { 2956 return vfprintf(f, fmt, args); 2957 } 2958 } 2959 2960 ATTRIBUTE_PRINTF(1, 2) 2961 JNIEXPORT int jio_printf(const char *fmt, ...) { 2962 int len; 2963 va_list args; 2964 va_start(args, fmt); 2965 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2966 va_end(args); 2967 return len; 2968 } 2969 2970 // HotSpot specific jio method 2971 void jio_print(const char* s, size_t len) { 2972 // Try to make this function as atomic as possible. 2973 if (Arguments::vfprintf_hook() != NULL) { 2974 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2975 } else { 2976 // Make an unused local variable to avoid warning from gcc compiler. 2977 size_t count = ::write(defaultStream::output_fd(), s, (int)len); 2978 } 2979 } 2980 2981 } // Extern C 2982 2983 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2984 2985 // In most of the JVM thread support functions we need to access the 2986 // thread through a ThreadsListHandle to prevent it from exiting and 2987 // being reclaimed while we try to operate on it. The exceptions to this 2988 // rule are when operating on the current thread, or if the monitor of 2989 // the target java.lang.Thread is locked at the Java level - in both 2990 // cases the target cannot exit. 2991 2992 static void thread_entry(JavaThread* thread, TRAPS) { 2993 HandleMark hm(THREAD); 2994 Handle obj(THREAD, thread->threadObj()); 2995 JavaValue result(T_VOID); 2996 JavaCalls::call_virtual(&result, 2997 obj, 2998 SystemDictionary::Thread_klass(), 2999 vmSymbols::run_method_name(), 3000 vmSymbols::void_method_signature(), 3001 THREAD); 3002 } 3003 3004 3005 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 3006 JVMWrapper("JVM_StartThread"); 3007 JavaThread *native_thread = NULL; 3008 3009 // We cannot hold the Threads_lock when we throw an exception, 3010 // due to rank ordering issues. Example: we might need to grab the 3011 // Heap_lock while we construct the exception. 3012 bool throw_illegal_thread_state = false; 3013 3014 // We must release the Threads_lock before we can post a jvmti event 3015 // in Thread::start. 3016 { 3017 // Ensure that the C++ Thread and OSThread structures aren't freed before 3018 // we operate. 3019 MutexLocker mu(Threads_lock); 3020 3021 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 3022 // re-starting an already started thread, so we should usually find 3023 // that the JavaThread is null. However for a JNI attached thread 3024 // there is a small window between the Thread object being created 3025 // (with its JavaThread set) and the update to its threadStatus, so we 3026 // have to check for this 3027 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 3028 throw_illegal_thread_state = true; 3029 } else { 3030 // We could also check the stillborn flag to see if this thread was already stopped, but 3031 // for historical reasons we let the thread detect that itself when it starts running 3032 3033 jlong size = 3034 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 3035 // Allocate the C++ Thread structure and create the native thread. The 3036 // stack size retrieved from java is 64-bit signed, but the constructor takes 3037 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 3038 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 3039 // - Avoid passing negative values which would result in really large stacks. 3040 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 3041 size_t sz = size > 0 ? (size_t) size : 0; 3042 native_thread = new JavaThread(&thread_entry, sz); 3043 3044 // At this point it may be possible that no osthread was created for the 3045 // JavaThread due to lack of memory. Check for this situation and throw 3046 // an exception if necessary. Eventually we may want to change this so 3047 // that we only grab the lock if the thread was created successfully - 3048 // then we can also do this check and throw the exception in the 3049 // JavaThread constructor. 3050 if (native_thread->osthread() != NULL) { 3051 // Note: the current thread is not being used within "prepare". 3052 native_thread->prepare(jthread); 3053 } 3054 } 3055 } 3056 3057 if (throw_illegal_thread_state) { 3058 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3059 } 3060 3061 assert(native_thread != NULL, "Starting null thread?"); 3062 3063 if (native_thread->osthread() == NULL) { 3064 // No one should hold a reference to the 'native_thread'. 3065 native_thread->smr_delete(); 3066 if (JvmtiExport::should_post_resource_exhausted()) { 3067 JvmtiExport::post_resource_exhausted( 3068 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3069 os::native_thread_creation_failed_msg()); 3070 } 3071 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3072 os::native_thread_creation_failed_msg()); 3073 } 3074 3075 #if INCLUDE_JFR 3076 if (Jfr::is_recording() && EventThreadStart::is_enabled() && 3077 EventThreadStart::is_stacktrace_enabled()) { 3078 JfrThreadLocal* tl = native_thread->jfr_thread_local(); 3079 // skip Thread.start() and Thread.start0() 3080 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2)); 3081 } 3082 #endif 3083 3084 Thread::start(native_thread); 3085 3086 JVM_END 3087 3088 3089 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 3090 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 3091 // but is thought to be reliable and simple. In the case, where the receiver is the 3092 // same thread as the sender, no VM_Operation is needed. 3093 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 3094 JVMWrapper("JVM_StopThread"); 3095 3096 // A nested ThreadsListHandle will grab the Threads_lock so create 3097 // tlh before we resolve throwable. 3098 ThreadsListHandle tlh(thread); 3099 oop java_throwable = JNIHandles::resolve(throwable); 3100 if (java_throwable == NULL) { 3101 THROW(vmSymbols::java_lang_NullPointerException()); 3102 } 3103 oop java_thread = NULL; 3104 JavaThread* receiver = NULL; 3105 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3106 Events::log_exception(thread, 3107 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 3108 p2i(receiver), p2i(java_thread), p2i(throwable)); 3109 3110 if (is_alive) { 3111 // jthread refers to a live JavaThread. 3112 if (thread == receiver) { 3113 // Exception is getting thrown at self so no VM_Operation needed. 3114 THROW_OOP(java_throwable); 3115 } else { 3116 // Use a VM_Operation to throw the exception. 3117 Thread::send_async_exception(java_thread, java_throwable); 3118 } 3119 } else { 3120 // Either: 3121 // - target thread has not been started before being stopped, or 3122 // - target thread already terminated 3123 // We could read the threadStatus to determine which case it is 3124 // but that is overkill as it doesn't matter. We must set the 3125 // stillborn flag for the first case, and if the thread has already 3126 // exited setting this flag has no effect. 3127 java_lang_Thread::set_stillborn(java_thread); 3128 } 3129 JVM_END 3130 3131 3132 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 3133 JVMWrapper("JVM_IsThreadAlive"); 3134 3135 oop thread_oop = JNIHandles::resolve_non_null(jthread); 3136 return java_lang_Thread::is_alive(thread_oop); 3137 JVM_END 3138 3139 3140 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 3141 JVMWrapper("JVM_SuspendThread"); 3142 3143 ThreadsListHandle tlh(thread); 3144 JavaThread* receiver = NULL; 3145 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3146 if (is_alive) { 3147 // jthread refers to a live JavaThread. 3148 { 3149 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 3150 if (receiver->is_external_suspend()) { 3151 // Don't allow nested external suspend requests. We can't return 3152 // an error from this interface so just ignore the problem. 3153 return; 3154 } 3155 if (receiver->is_exiting()) { // thread is in the process of exiting 3156 return; 3157 } 3158 receiver->set_external_suspend(); 3159 } 3160 3161 // java_suspend() will catch threads in the process of exiting 3162 // and will ignore them. 3163 receiver->java_suspend(); 3164 3165 // It would be nice to have the following assertion in all the 3166 // time, but it is possible for a racing resume request to have 3167 // resumed this thread right after we suspended it. Temporarily 3168 // enable this assertion if you are chasing a different kind of 3169 // bug. 3170 // 3171 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 3172 // receiver->is_being_ext_suspended(), "thread is not suspended"); 3173 } 3174 JVM_END 3175 3176 3177 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 3178 JVMWrapper("JVM_ResumeThread"); 3179 3180 ThreadsListHandle tlh(thread); 3181 JavaThread* receiver = NULL; 3182 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3183 if (is_alive) { 3184 // jthread refers to a live JavaThread. 3185 3186 // This is the original comment for this Threads_lock grab: 3187 // We need to *always* get the threads lock here, since this operation cannot be allowed during 3188 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 3189 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 3190 // looks at it. 3191 // 3192 // The above comment dates back to when we had both internal and 3193 // external suspend APIs that shared a common underlying mechanism. 3194 // External suspend is now entirely cooperative and doesn't share 3195 // anything with internal suspend. That said, there are some 3196 // assumptions in the VM that an external resume grabs the 3197 // Threads_lock. We can't drop the Threads_lock grab here until we 3198 // resolve the assumptions that exist elsewhere. 3199 // 3200 MutexLocker ml(Threads_lock); 3201 receiver->java_resume(); 3202 } 3203 JVM_END 3204 3205 3206 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3207 JVMWrapper("JVM_SetThreadPriority"); 3208 3209 ThreadsListHandle tlh(thread); 3210 oop java_thread = NULL; 3211 JavaThread* receiver = NULL; 3212 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3213 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3214 3215 if (is_alive) { 3216 // jthread refers to a live JavaThread. 3217 Thread::set_priority(receiver, (ThreadPriority)prio); 3218 } 3219 // Implied else: If the JavaThread hasn't started yet, then the 3220 // priority set in the java.lang.Thread object above will be pushed 3221 // down when it does start. 3222 JVM_END 3223 3224 3225 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3226 JVMWrapper("JVM_Yield"); 3227 if (os::dont_yield()) return; 3228 HOTSPOT_THREAD_YIELD(); 3229 os::naked_yield(); 3230 JVM_END 3231 3232 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) { 3233 assert(event != NULL, "invariant"); 3234 assert(event->should_commit(), "invariant"); 3235 event->set_time(millis); 3236 event->commit(); 3237 } 3238 3239 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3240 JVMWrapper("JVM_Sleep"); 3241 3242 if (millis < 0) { 3243 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3244 } 3245 3246 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3247 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3248 } 3249 3250 // Save current thread state and restore it at the end of this block. 3251 // And set new thread state to SLEEPING. 3252 JavaThreadSleepState jtss(thread); 3253 3254 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3255 EventThreadSleep event; 3256 3257 if (millis == 0) { 3258 os::naked_yield(); 3259 } else { 3260 ThreadState old_state = thread->osthread()->get_state(); 3261 thread->osthread()->set_state(SLEEPING); 3262 if (!thread->sleep(millis)) { // interrupted 3263 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3264 // us while we were sleeping. We do not overwrite those. 3265 if (!HAS_PENDING_EXCEPTION) { 3266 if (event.should_commit()) { 3267 post_thread_sleep_event(&event, millis); 3268 } 3269 HOTSPOT_THREAD_SLEEP_END(1); 3270 3271 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3272 // to properly restore the thread state. That's likely wrong. 3273 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3274 } 3275 } 3276 thread->osthread()->set_state(old_state); 3277 } 3278 if (event.should_commit()) { 3279 post_thread_sleep_event(&event, millis); 3280 } 3281 HOTSPOT_THREAD_SLEEP_END(0); 3282 JVM_END 3283 3284 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3285 JVMWrapper("JVM_CurrentThread"); 3286 oop jthread = thread->threadObj(); 3287 assert (thread != NULL, "no current thread!"); 3288 return JNIHandles::make_local(env, jthread); 3289 JVM_END 3290 3291 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3292 JVMWrapper("JVM_Interrupt"); 3293 3294 ThreadsListHandle tlh(thread); 3295 JavaThread* receiver = NULL; 3296 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3297 if (is_alive) { 3298 // jthread refers to a live JavaThread. 3299 receiver->interrupt(); 3300 } 3301 JVM_END 3302 3303 3304 // Return true iff the current thread has locked the object passed in 3305 3306 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3307 JVMWrapper("JVM_HoldsLock"); 3308 assert(THREAD->is_Java_thread(), "sanity check"); 3309 if (obj == NULL) { 3310 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3311 } 3312 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3313 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3314 JVM_END 3315 3316 3317 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3318 JVMWrapper("JVM_DumpAllStacks"); 3319 VM_PrintThreads op; 3320 VMThread::execute(&op); 3321 if (JvmtiExport::should_post_data_dump()) { 3322 JvmtiExport::post_data_dump(); 3323 } 3324 JVM_END 3325 3326 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3327 JVMWrapper("JVM_SetNativeThreadName"); 3328 3329 // We don't use a ThreadsListHandle here because the current thread 3330 // must be alive. 3331 oop java_thread = JNIHandles::resolve_non_null(jthread); 3332 JavaThread* thr = java_lang_Thread::thread(java_thread); 3333 if (thread == thr && !thr->has_attached_via_jni()) { 3334 // Thread naming is only supported for the current thread and 3335 // we don't set the name of an attached thread to avoid stepping 3336 // on other programs. 3337 ResourceMark rm(thread); 3338 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3339 os::set_native_thread_name(thread_name); 3340 } 3341 JVM_END 3342 3343 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3344 3345 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3346 JVMWrapper("JVM_GetClassContext"); 3347 ResourceMark rm(THREAD); 3348 JvmtiVMObjectAllocEventCollector oam; 3349 vframeStream vfst(thread); 3350 3351 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3352 // This must only be called from SecurityManager.getClassContext 3353 Method* m = vfst.method(); 3354 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3355 m->name() == vmSymbols::getClassContext_name() && 3356 m->signature() == vmSymbols::void_class_array_signature())) { 3357 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3358 } 3359 } 3360 3361 // Collect method holders 3362 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3363 for (; !vfst.at_end(); vfst.security_next()) { 3364 Method* m = vfst.method(); 3365 // Native frames are not returned 3366 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3367 Klass* holder = m->method_holder(); 3368 assert(holder->is_klass(), "just checking"); 3369 klass_array->append(holder); 3370 } 3371 } 3372 3373 // Create result array of type [Ljava/lang/Class; 3374 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3375 // Fill in mirrors corresponding to method holders 3376 for (int i = 0; i < klass_array->length(); i++) { 3377 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3378 } 3379 3380 return (jobjectArray) JNIHandles::make_local(env, result); 3381 JVM_END 3382 3383 3384 // java.lang.Package //////////////////////////////////////////////////////////////// 3385 3386 3387 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3388 JVMWrapper("JVM_GetSystemPackage"); 3389 ResourceMark rm(THREAD); 3390 JvmtiVMObjectAllocEventCollector oam; 3391 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3392 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3393 return (jstring) JNIHandles::make_local(result); 3394 JVM_END 3395 3396 3397 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3398 JVMWrapper("JVM_GetSystemPackages"); 3399 JvmtiVMObjectAllocEventCollector oam; 3400 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3401 return (jobjectArray) JNIHandles::make_local(result); 3402 JVM_END 3403 3404 3405 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3406 3407 3408 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3409 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3410 3411 MonitorLocker ml(Heap_lock); 3412 oop ref = Universe::reference_pending_list(); 3413 if (ref != NULL) { 3414 Universe::set_reference_pending_list(NULL); 3415 } 3416 return JNIHandles::make_local(env, ref); 3417 JVM_END 3418 3419 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3420 JVMWrapper("JVM_HasReferencePendingList"); 3421 MonitorLocker ml(Heap_lock); 3422 return Universe::has_reference_pending_list(); 3423 JVM_END 3424 3425 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3426 JVMWrapper("JVM_WaitForReferencePendingList"); 3427 MonitorLocker ml(Heap_lock); 3428 while (!Universe::has_reference_pending_list()) { 3429 ml.wait(); 3430 } 3431 JVM_END 3432 3433 3434 // ObjectInputStream /////////////////////////////////////////////////////////////// 3435 3436 // Return the first user-defined class loader up the execution stack, or null 3437 // if only code from the bootstrap or platform class loader is on the stack. 3438 3439 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3440 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3441 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3442 oop loader = vfst.method()->method_holder()->class_loader(); 3443 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3444 return JNIHandles::make_local(env, loader); 3445 } 3446 } 3447 return NULL; 3448 JVM_END 3449 3450 3451 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3452 3453 3454 // resolve array handle and check arguments 3455 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3456 if (arr == NULL) { 3457 THROW_0(vmSymbols::java_lang_NullPointerException()); 3458 } 3459 oop a = JNIHandles::resolve_non_null(arr); 3460 if (!a->is_array()) { 3461 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3462 } else if (type_array_only && !a->is_typeArray()) { 3463 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3464 } 3465 return arrayOop(a); 3466 } 3467 3468 3469 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3470 JVMWrapper("JVM_GetArrayLength"); 3471 arrayOop a = check_array(env, arr, false, CHECK_0); 3472 return a->length(); 3473 JVM_END 3474 3475 3476 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3477 JVMWrapper("JVM_Array_Get"); 3478 JvmtiVMObjectAllocEventCollector oam; 3479 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3480 jvalue value; 3481 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3482 oop box = Reflection::box(&value, type, CHECK_NULL); 3483 return JNIHandles::make_local(env, box); 3484 JVM_END 3485 3486 3487 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3488 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3489 jvalue value; 3490 value.i = 0; // to initialize value before getting used in CHECK 3491 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3492 assert(a->is_typeArray(), "just checking"); 3493 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3494 BasicType wide_type = (BasicType) wCode; 3495 if (type != wide_type) { 3496 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3497 } 3498 return value; 3499 JVM_END 3500 3501 3502 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3503 JVMWrapper("JVM_SetArrayElement"); 3504 arrayOop a = check_array(env, arr, false, CHECK); 3505 oop box = JNIHandles::resolve(val); 3506 jvalue value; 3507 value.i = 0; // to initialize value before getting used in CHECK 3508 BasicType value_type; 3509 if (a->is_objArray()) { 3510 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3511 value_type = Reflection::unbox_for_regular_object(box, &value); 3512 } else { 3513 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3514 } 3515 Reflection::array_set(&value, a, index, value_type, CHECK); 3516 JVM_END 3517 3518 3519 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3520 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3521 arrayOop a = check_array(env, arr, true, CHECK); 3522 assert(a->is_typeArray(), "just checking"); 3523 BasicType value_type = (BasicType) vCode; 3524 Reflection::array_set(&v, a, index, value_type, CHECK); 3525 JVM_END 3526 3527 3528 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3529 JVMWrapper("JVM_NewArray"); 3530 JvmtiVMObjectAllocEventCollector oam; 3531 oop element_mirror = JNIHandles::resolve(eltClass); 3532 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3533 return JNIHandles::make_local(env, result); 3534 JVM_END 3535 3536 3537 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3538 JVMWrapper("JVM_NewMultiArray"); 3539 JvmtiVMObjectAllocEventCollector oam; 3540 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3541 oop element_mirror = JNIHandles::resolve(eltClass); 3542 assert(dim_array->is_typeArray(), "just checking"); 3543 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3544 return JNIHandles::make_local(env, result); 3545 JVM_END 3546 3547 3548 // Library support /////////////////////////////////////////////////////////////////////////// 3549 3550 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3551 //%note jvm_ct 3552 JVMWrapper("JVM_LoadLibrary"); 3553 char ebuf[1024]; 3554 void *load_result; 3555 { 3556 ThreadToNativeFromVM ttnfvm(thread); 3557 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3558 } 3559 if (load_result == NULL) { 3560 char msg[1024]; 3561 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3562 // Since 'ebuf' may contain a string encoded using 3563 // platform encoding scheme, we need to pass 3564 // Exceptions::unsafe_to_utf8 to the new_exception method 3565 // as the last argument. See bug 6367357. 3566 Handle h_exception = 3567 Exceptions::new_exception(thread, 3568 vmSymbols::java_lang_UnsatisfiedLinkError(), 3569 msg, Exceptions::unsafe_to_utf8); 3570 3571 THROW_HANDLE_0(h_exception); 3572 } 3573 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3574 return load_result; 3575 JVM_END 3576 3577 3578 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3579 JVMWrapper("JVM_UnloadLibrary"); 3580 os::dll_unload(handle); 3581 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3582 JVM_END 3583 3584 3585 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3586 JVMWrapper("JVM_FindLibraryEntry"); 3587 void* find_result = os::dll_lookup(handle, name); 3588 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3589 find_result != NULL ? "Found" : "Failed to find", 3590 name, p2i(handle)); 3591 return find_result; 3592 JVM_END 3593 3594 3595 // JNI version /////////////////////////////////////////////////////////////////////////////// 3596 3597 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3598 JVMWrapper("JVM_IsSupportedJNIVersion"); 3599 return Threads::is_supported_jni_version_including_1_1(version); 3600 JVM_END 3601 3602 3603 // String support /////////////////////////////////////////////////////////////////////////// 3604 3605 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3606 JVMWrapper("JVM_InternString"); 3607 JvmtiVMObjectAllocEventCollector oam; 3608 if (str == NULL) return NULL; 3609 oop string = JNIHandles::resolve_non_null(str); 3610 oop result = StringTable::intern(string, CHECK_NULL); 3611 return (jstring) JNIHandles::make_local(env, result); 3612 JVM_END 3613 3614 3615 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3616 3617 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3618 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3619 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3620 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3621 // nature. JavaThreads will be "in native" when using this API from JDK code. 3622 3623 3624 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3625 VM_Exit::block_if_vm_exited(); 3626 JVMWrapper("JVM_RawMonitorCreate"); 3627 return new os::PlatformMutex(); 3628 } 3629 3630 3631 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3632 VM_Exit::block_if_vm_exited(); 3633 JVMWrapper("JVM_RawMonitorDestroy"); 3634 delete ((os::PlatformMutex*) mon); 3635 } 3636 3637 3638 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3639 VM_Exit::block_if_vm_exited(); 3640 JVMWrapper("JVM_RawMonitorEnter"); 3641 ((os::PlatformMutex*) mon)->lock(); 3642 return 0; 3643 } 3644 3645 3646 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3647 VM_Exit::block_if_vm_exited(); 3648 JVMWrapper("JVM_RawMonitorExit"); 3649 ((os::PlatformMutex*) mon)->unlock(); 3650 } 3651 3652 3653 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3654 3655 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3656 Handle loader, Handle protection_domain, 3657 jboolean throwError, TRAPS) { 3658 // Security Note: 3659 // The Java level wrapper will perform the necessary security check allowing 3660 // us to pass the NULL as the initiating class loader. The VM is responsible for 3661 // the checkPackageAccess relative to the initiating class loader via the 3662 // protection_domain. The protection_domain is passed as NULL by the java code 3663 // if there is no security manager in 3-arg Class.forName(). 3664 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3665 3666 // Check if we should initialize the class 3667 if (init && klass->is_instance_klass()) { 3668 klass->initialize(CHECK_NULL); 3669 } 3670 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3671 } 3672 3673 3674 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3675 3676 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3677 JVMWrapper("JVM_InvokeMethod"); 3678 Handle method_handle; 3679 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3680 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3681 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3682 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3683 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3684 jobject res = JNIHandles::make_local(env, result); 3685 if (JvmtiExport::should_post_vm_object_alloc()) { 3686 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3687 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3688 if (java_lang_Class::is_primitive(ret_type)) { 3689 // Only for primitive type vm allocates memory for java object. 3690 // See box() method. 3691 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3692 } 3693 } 3694 return res; 3695 } else { 3696 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3697 } 3698 JVM_END 3699 3700 3701 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3702 JVMWrapper("JVM_NewInstanceFromConstructor"); 3703 oop constructor_mirror = JNIHandles::resolve(c); 3704 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3705 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3706 jobject res = JNIHandles::make_local(env, result); 3707 if (JvmtiExport::should_post_vm_object_alloc()) { 3708 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3709 } 3710 return res; 3711 JVM_END 3712 3713 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3714 3715 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3716 JVMWrapper("JVM_SupportsCX8"); 3717 return VM_Version::supports_cx8(); 3718 JVM_END 3719 3720 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3721 JVMWrapper("JVM_InitializeFromArchive"); 3722 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3723 assert(k->is_klass(), "just checking"); 3724 HeapShared::initialize_from_archived_subgraph(k); 3725 JVM_END 3726 3727 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env, 3728 jclass caller, 3729 jstring invokedName, 3730 jobject invokedType, 3731 jobject methodType, 3732 jobject implMethodMember, 3733 jobject instantiatedMethodType, 3734 jclass lambdaProxyClass)) 3735 JVMWrapper("JVM_RegisterLambdaProxyClassForArchiving"); 3736 #if INCLUDE_CDS 3737 if (!DynamicDumpSharedSpaces) { 3738 return; 3739 } 3740 3741 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3742 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3743 if (caller_ik->is_hidden() || caller_ik->is_unsafe_anonymous()) { 3744 // VM anonymous classes and hidden classes not of type lambda proxy classes are currently not being archived. 3745 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be 3746 // registered for archiving. 3747 return; 3748 } 3749 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass)); 3750 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k); 3751 assert(lambda_ik->is_hidden(), "must be a hidden class"); 3752 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class"); 3753 3754 Symbol* invoked_name = NULL; 3755 if (invokedName != NULL) { 3756 invoked_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(invokedName)); 3757 } 3758 Handle invoked_type_oop(THREAD, JNIHandles::resolve_non_null(invokedType)); 3759 Symbol* invoked_type = java_lang_invoke_MethodType::as_signature(invoked_type_oop(), true); 3760 3761 Handle method_type_oop(THREAD, JNIHandles::resolve_non_null(methodType)); 3762 Symbol* method_type = java_lang_invoke_MethodType::as_signature(method_type_oop(), true); 3763 3764 Handle impl_method_member_oop(THREAD, JNIHandles::resolve_non_null(implMethodMember)); 3765 assert(java_lang_invoke_MemberName::is_method(impl_method_member_oop()), "must be"); 3766 Method* m = java_lang_invoke_MemberName::vmtarget(impl_method_member_oop()); 3767 3768 Handle instantiated_method_type_oop(THREAD, JNIHandles::resolve_non_null(instantiatedMethodType)); 3769 Symbol* instantiated_method_type = java_lang_invoke_MethodType::as_signature(instantiated_method_type_oop(), true); 3770 3771 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, invoked_name, invoked_type, 3772 method_type, m, instantiated_method_type); 3773 #endif // INCLUDE_CDS 3774 JVM_END 3775 3776 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env, 3777 jclass caller, 3778 jstring invokedName, 3779 jobject invokedType, 3780 jobject methodType, 3781 jobject implMethodMember, 3782 jobject instantiatedMethodType, 3783 jboolean initialize)) 3784 JVMWrapper("JVM_LookupLambdaProxyClassFromArchive"); 3785 #if INCLUDE_CDS 3786 if (!DynamicArchive::is_mapped()) { 3787 return NULL; 3788 } 3789 3790 if (invokedName == NULL || invokedType == NULL || methodType == NULL || 3791 implMethodMember == NULL || instantiatedMethodType == NULL) { 3792 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 3793 } 3794 3795 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller)); 3796 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k); 3797 if (!caller_ik->is_shared()) { 3798 // there won't be a shared lambda class if the caller_ik is not in the shared archive. 3799 return NULL; 3800 } 3801 3802 Symbol* invoked_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(invokedName)); 3803 Handle invoked_type_oop(THREAD, JNIHandles::resolve_non_null(invokedType)); 3804 Symbol* invoked_type = java_lang_invoke_MethodType::as_signature(invoked_type_oop(), true); 3805 3806 Handle method_type_oop(THREAD, JNIHandles::resolve_non_null(methodType)); 3807 Symbol* method_type = java_lang_invoke_MethodType::as_signature(method_type_oop(), true); 3808 3809 Handle impl_method_member_oop(THREAD, JNIHandles::resolve_non_null(implMethodMember)); 3810 assert(java_lang_invoke_MemberName::is_method(impl_method_member_oop()), "must be"); 3811 Method* m = java_lang_invoke_MemberName::vmtarget(impl_method_member_oop()); 3812 3813 Handle instantiated_method_type_oop(THREAD, JNIHandles::resolve_non_null(instantiatedMethodType)); 3814 Symbol* instantiated_method_type = java_lang_invoke_MethodType::as_signature(instantiated_method_type_oop(), true); 3815 3816 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, invoked_name, invoked_type, 3817 method_type, m, instantiated_method_type); 3818 jclass jcls = NULL; 3819 if (lambda_ik != NULL) { 3820 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, initialize, THREAD); 3821 jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(env, loaded_lambda->java_mirror()); 3822 } 3823 return jcls; 3824 #else 3825 return NULL; 3826 #endif // INCLUDE_CDS 3827 JVM_END 3828 3829 JVM_ENTRY(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env)) 3830 JVMWrapper("JVM_IsCDSDumpingEnable"); 3831 return DynamicDumpSharedSpaces; 3832 JVM_END 3833 3834 JVM_ENTRY(jboolean, JVM_IsCDSSharingEnabled(JNIEnv* env)) 3835 JVMWrapper("JVM_IsCDSSharingEnable"); 3836 return UseSharedSpaces; 3837 JVM_END 3838 3839 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForCDSDump()) 3840 JVMWrapper("JVM_GetRandomSeedForCDSDump"); 3841 if (DumpSharedSpaces) { 3842 const char* release = Abstract_VM_Version::vm_release(); 3843 const char* dbg_level = Abstract_VM_Version::jdk_debug_level(); 3844 const char* version = VM_Version::internal_vm_info_string(); 3845 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^ 3846 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^ 3847 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version))); 3848 seed += (jlong)Abstract_VM_Version::vm_major_version(); 3849 seed += (jlong)Abstract_VM_Version::vm_minor_version(); 3850 seed += (jlong)Abstract_VM_Version::vm_security_version(); 3851 seed += (jlong)Abstract_VM_Version::vm_patch_version(); 3852 if (seed == 0) { // don't let this ever be zero. 3853 seed = 0x87654321; 3854 } 3855 log_debug(cds)("JVM_GetRandomSeedForCDSDump() = " JLONG_FORMAT, seed); 3856 return seed; 3857 } else { 3858 return 0; 3859 } 3860 JVM_END 3861 3862 // Returns an array of all live Thread objects (VM internal JavaThreads, 3863 // jvmti agent threads, and JNI attaching threads are skipped) 3864 // See CR 6404306 regarding JNI attaching threads 3865 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3866 ResourceMark rm(THREAD); 3867 ThreadsListEnumerator tle(THREAD, false, false); 3868 JvmtiVMObjectAllocEventCollector oam; 3869 3870 int num_threads = tle.num_threads(); 3871 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3872 objArrayHandle threads_ah(THREAD, r); 3873 3874 for (int i = 0; i < num_threads; i++) { 3875 Handle h = tle.get_threadObj(i); 3876 threads_ah->obj_at_put(i, h()); 3877 } 3878 3879 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3880 JVM_END 3881 3882 3883 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3884 // Return StackTraceElement[][], each element is the stack trace of a thread in 3885 // the corresponding entry in the given threads array 3886 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3887 JVMWrapper("JVM_DumpThreads"); 3888 JvmtiVMObjectAllocEventCollector oam; 3889 3890 // Check if threads is null 3891 if (threads == NULL) { 3892 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3893 } 3894 3895 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3896 objArrayHandle ah(THREAD, a); 3897 int num_threads = ah->length(); 3898 // check if threads is non-empty array 3899 if (num_threads == 0) { 3900 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3901 } 3902 3903 // check if threads is not an array of objects of Thread class 3904 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3905 if (k != SystemDictionary::Thread_klass()) { 3906 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3907 } 3908 3909 ResourceMark rm(THREAD); 3910 3911 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3912 for (int i = 0; i < num_threads; i++) { 3913 oop thread_obj = ah->obj_at(i); 3914 instanceHandle h(THREAD, (instanceOop) thread_obj); 3915 thread_handle_array->append(h); 3916 } 3917 3918 // The JavaThread references in thread_handle_array are validated 3919 // in VM_ThreadDump::doit(). 3920 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3921 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3922 3923 JVM_END 3924 3925 // JVM monitoring and management support 3926 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3927 return Management::get_jmm_interface(version); 3928 JVM_END 3929 3930 // com.sun.tools.attach.VirtualMachine agent properties support 3931 // 3932 // Initialize the agent properties with the properties maintained in the VM 3933 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3934 JVMWrapper("JVM_InitAgentProperties"); 3935 ResourceMark rm; 3936 3937 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3938 3939 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3940 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3941 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3942 return properties; 3943 JVM_END 3944 3945 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3946 { 3947 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3948 JvmtiVMObjectAllocEventCollector oam; 3949 3950 if (ofClass == NULL) { 3951 return NULL; 3952 } 3953 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3954 // Special handling for primitive objects 3955 if (java_lang_Class::is_primitive(mirror())) { 3956 return NULL; 3957 } 3958 Klass* k = java_lang_Class::as_Klass(mirror()); 3959 if (!k->is_instance_klass()) { 3960 return NULL; 3961 } 3962 InstanceKlass* ik = InstanceKlass::cast(k); 3963 int encl_method_class_idx = ik->enclosing_method_class_index(); 3964 if (encl_method_class_idx == 0) { 3965 return NULL; 3966 } 3967 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3968 objArrayHandle dest(THREAD, dest_o); 3969 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3970 dest->obj_at_put(0, enc_k->java_mirror()); 3971 int encl_method_method_idx = ik->enclosing_method_method_index(); 3972 if (encl_method_method_idx != 0) { 3973 Symbol* sym = ik->constants()->symbol_at( 3974 extract_low_short_from_int( 3975 ik->constants()->name_and_type_at(encl_method_method_idx))); 3976 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3977 dest->obj_at_put(1, str()); 3978 sym = ik->constants()->symbol_at( 3979 extract_high_short_from_int( 3980 ik->constants()->name_and_type_at(encl_method_method_idx))); 3981 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3982 dest->obj_at_put(2, str()); 3983 } 3984 return (jobjectArray) JNIHandles::make_local(dest()); 3985 } 3986 JVM_END 3987 3988 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3989 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3990 ResourceMark rm(THREAD); 3991 3992 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3993 return NULL; 3994 } 3995 3996 char** vm_flags = Arguments::jvm_flags_array(); 3997 char** vm_args = Arguments::jvm_args_array(); 3998 int num_flags = Arguments::num_jvm_flags(); 3999 int num_args = Arguments::num_jvm_args(); 4000 4001 InstanceKlass* ik = SystemDictionary::String_klass(); 4002 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 4003 objArrayHandle result_h(THREAD, r); 4004 4005 int index = 0; 4006 for (int j = 0; j < num_flags; j++, index++) { 4007 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 4008 result_h->obj_at_put(index, h()); 4009 } 4010 for (int i = 0; i < num_args; i++, index++) { 4011 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 4012 result_h->obj_at_put(index, h()); 4013 } 4014 return (jobjectArray) JNIHandles::make_local(env, result_h()); 4015 JVM_END 4016 4017 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 4018 return os::get_signal_number(name); 4019 JVM_END