1 /* 2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "classfile/classFileStream.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/javaAssertions.hpp" 31 #include "classfile/javaClasses.inline.hpp" 32 #include "classfile/moduleEntry.hpp" 33 #include "classfile/modules.hpp" 34 #include "classfile/packageEntry.hpp" 35 #include "classfile/stringTable.hpp" 36 #include "classfile/symbolTable.hpp" 37 #include "classfile/systemDictionary.hpp" 38 #include "classfile/vmSymbols.hpp" 39 #include "gc/shared/collectedHeap.inline.hpp" 40 #include "interpreter/bytecode.hpp" 41 #include "interpreter/bytecodeUtils.hpp" 42 #include "jfr/jfrEvents.hpp" 43 #include "logging/log.hpp" 44 #include "memory/heapShared.hpp" 45 #include "memory/oopFactory.hpp" 46 #include "memory/referenceType.hpp" 47 #include "memory/resourceArea.hpp" 48 #include "memory/universe.hpp" 49 #include "oops/access.inline.hpp" 50 #include "oops/constantPool.hpp" 51 #include "oops/fieldStreams.inline.hpp" 52 #include "oops/instanceKlass.hpp" 53 #include "oops/method.hpp" 54 #include "oops/recordComponent.hpp" 55 #include "oops/objArrayKlass.hpp" 56 #include "oops/objArrayOop.inline.hpp" 57 #include "oops/oop.inline.hpp" 58 #include "prims/jvm_misc.hpp" 59 #include "prims/jvmtiExport.hpp" 60 #include "prims/jvmtiThreadState.hpp" 61 #include "prims/nativeLookup.hpp" 62 #include "prims/stackwalk.hpp" 63 #include "runtime/arguments.hpp" 64 #include "runtime/atomic.hpp" 65 #include "runtime/handles.inline.hpp" 66 #include "runtime/init.hpp" 67 #include "runtime/interfaceSupport.inline.hpp" 68 #include "runtime/deoptimization.hpp" 69 #include "runtime/handshake.hpp" 70 #include "runtime/java.hpp" 71 #include "runtime/javaCalls.hpp" 72 #include "runtime/jfieldIDWorkaround.hpp" 73 #include "runtime/jniHandles.inline.hpp" 74 #include "runtime/os.inline.hpp" 75 #include "runtime/perfData.hpp" 76 #include "runtime/reflection.hpp" 77 #include "runtime/thread.inline.hpp" 78 #include "runtime/threadSMR.hpp" 79 #include "runtime/vframe.inline.hpp" 80 #include "runtime/vmOperations.hpp" 81 #include "runtime/vm_version.hpp" 82 #include "services/attachListener.hpp" 83 #include "services/management.hpp" 84 #include "services/threadService.hpp" 85 #include "utilities/copy.hpp" 86 #include "utilities/defaultStream.hpp" 87 #include "utilities/dtrace.hpp" 88 #include "utilities/events.hpp" 89 #include "utilities/histogram.hpp" 90 #include "utilities/macros.hpp" 91 #include "utilities/utf8.hpp" 92 #if INCLUDE_CDS 93 #include "classfile/systemDictionaryShared.hpp" 94 #endif 95 96 #include <errno.h> 97 #include <jfr/recorder/jfrRecorder.hpp> 98 99 /* 100 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 101 such ctors and calls MUST NOT come between an oop declaration/init and its 102 usage because if objects are move this may cause various memory stomps, bus 103 errors and segfaults. Here is a cookbook for causing so called "naked oop 104 failures": 105 106 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 107 JVMWrapper("JVM_GetClassDeclaredFields"); 108 109 // Object address to be held directly in mirror & not visible to GC 110 oop mirror = JNIHandles::resolve_non_null(ofClass); 111 112 // If this ctor can hit a safepoint, moving objects around, then 113 ComplexConstructor foo; 114 115 // Boom! mirror may point to JUNK instead of the intended object 116 (some dereference of mirror) 117 118 // Here's another call that may block for GC, making mirror stale 119 MutexLocker ml(some_lock); 120 121 // And here's an initializer that can result in a stale oop 122 // all in one step. 123 oop o = call_that_can_throw_exception(TRAPS); 124 125 126 The solution is to keep the oop declaration BELOW the ctor or function 127 call that might cause a GC, do another resolve to reassign the oop, or 128 consider use of a Handle instead of an oop so there is immunity from object 129 motion. But note that the "QUICK" entries below do not have a handlemark 130 and thus can only support use of handles passed in. 131 */ 132 133 static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 134 ResourceMark rm; 135 int line_number = -1; 136 const char * source_file = NULL; 137 const char * trace = "explicit"; 138 InstanceKlass* caller = NULL; 139 JavaThread* jthread = JavaThread::current(); 140 if (jthread->has_last_Java_frame()) { 141 vframeStream vfst(jthread); 142 143 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 144 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController"); 145 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 146 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction"); 147 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 148 149 Method* last_caller = NULL; 150 151 while (!vfst.at_end()) { 152 Method* m = vfst.method(); 153 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 154 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 155 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 156 break; 157 } 158 last_caller = m; 159 vfst.next(); 160 } 161 // if this is called from Class.forName0 and that is called from Class.forName, 162 // then print the caller of Class.forName. If this is Class.loadClass, then print 163 // that caller, otherwise keep quiet since this should be picked up elsewhere. 164 bool found_it = false; 165 if (!vfst.at_end() && 166 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 167 vfst.method()->name() == vmSymbols::forName0_name()) { 168 vfst.next(); 169 if (!vfst.at_end() && 170 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 171 vfst.method()->name() == vmSymbols::forName_name()) { 172 vfst.next(); 173 found_it = true; 174 } 175 } else if (last_caller != NULL && 176 last_caller->method_holder()->name() == 177 vmSymbols::java_lang_ClassLoader() && 178 last_caller->name() == vmSymbols::loadClass_name()) { 179 found_it = true; 180 } else if (!vfst.at_end()) { 181 if (vfst.method()->is_native()) { 182 // JNI call 183 found_it = true; 184 } 185 } 186 if (found_it && !vfst.at_end()) { 187 // found the caller 188 caller = vfst.method()->method_holder(); 189 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 190 if (line_number == -1) { 191 // show method name if it's a native method 192 trace = vfst.method()->name_and_sig_as_C_string(); 193 } 194 Symbol* s = caller->source_file_name(); 195 if (s != NULL) { 196 source_file = s->as_C_string(); 197 } 198 } 199 } 200 if (caller != NULL) { 201 if (to_class != caller) { 202 const char * from = caller->external_name(); 203 const char * to = to_class->external_name(); 204 // print in a single call to reduce interleaving between threads 205 if (source_file != NULL) { 206 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 207 } else { 208 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 209 } 210 } 211 } 212 } 213 214 void trace_class_resolution(Klass* to_class) { 215 EXCEPTION_MARK; 216 trace_class_resolution_impl(to_class, THREAD); 217 if (HAS_PENDING_EXCEPTION) { 218 CLEAR_PENDING_EXCEPTION; 219 } 220 } 221 222 // Wrapper to trace JVM functions 223 224 #ifdef ASSERT 225 Histogram* JVMHistogram; 226 volatile int JVMHistogram_lock = 0; 227 228 class JVMHistogramElement : public HistogramElement { 229 public: 230 JVMHistogramElement(const char* name); 231 }; 232 233 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 234 _name = elementName; 235 uintx count = 0; 236 237 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) { 238 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) { 239 count +=1; 240 if ( (WarnOnStalledSpinLock > 0) 241 && (count % WarnOnStalledSpinLock == 0)) { 242 warning("JVMHistogram_lock seems to be stalled"); 243 } 244 } 245 } 246 247 if(JVMHistogram == NULL) 248 JVMHistogram = new Histogram("JVM Call Counts",100); 249 250 JVMHistogram->add_element(this); 251 Atomic::dec(&JVMHistogram_lock); 252 } 253 254 #define JVMCountWrapper(arg) \ 255 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 256 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 257 258 #define JVMWrapper(arg) JVMCountWrapper(arg); 259 #else 260 #define JVMWrapper(arg) 261 #endif 262 263 264 // Interface version ///////////////////////////////////////////////////////////////////// 265 266 267 JVM_LEAF(jint, JVM_GetInterfaceVersion()) 268 return JVM_INTERFACE_VERSION; 269 JVM_END 270 271 272 // java.lang.System ////////////////////////////////////////////////////////////////////// 273 274 275 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 276 JVMWrapper("JVM_CurrentTimeMillis"); 277 return os::javaTimeMillis(); 278 JVM_END 279 280 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 281 JVMWrapper("JVM_NanoTime"); 282 return os::javaTimeNanos(); 283 JVM_END 284 285 // The function below is actually exposed by jdk.internal.misc.VM and not 286 // java.lang.System, but we choose to keep it here so that it stays next 287 // to JVM_CurrentTimeMillis and JVM_NanoTime 288 289 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 290 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 291 292 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 293 JVMWrapper("JVM_GetNanoTimeAdjustment"); 294 jlong seconds; 295 jlong nanos; 296 297 os::javaTimeSystemUTC(seconds, nanos); 298 299 // We're going to verify that the result can fit in a long. 300 // For that we need the difference in seconds between 'seconds' 301 // and 'offset_secs' to be such that: 302 // |seconds - offset_secs| < (2^63/10^9) 303 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 304 // which makes |seconds - offset_secs| < 2^33 305 // and we will prefer +/- 2^32 as the maximum acceptable diff 306 // as 2^32 has a more natural feel than 2^33... 307 // 308 // So if |seconds - offset_secs| >= 2^32 - we return a special 309 // sentinel value (-1) which the caller should take as an 310 // exception value indicating that the offset given to us is 311 // too far from range of the current time - leading to too big 312 // a nano adjustment. The caller is expected to recover by 313 // computing a more accurate offset and calling this method 314 // again. (For the record 2^32 secs is ~136 years, so that 315 // should rarely happen) 316 // 317 jlong diff = seconds - offset_secs; 318 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 319 return -1; // sentinel value: the offset is too far off the target 320 } 321 322 // return the adjustment. If you compute a time by adding 323 // this number of nanoseconds along with the number of seconds 324 // in the offset you should get the current UTC time. 325 return (diff * (jlong)1000000000) + nanos; 326 JVM_END 327 328 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 329 jobject dst, jint dst_pos, jint length)) 330 JVMWrapper("JVM_ArrayCopy"); 331 // Check if we have null pointers 332 if (src == NULL || dst == NULL) { 333 THROW(vmSymbols::java_lang_NullPointerException()); 334 } 335 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 336 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 337 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop"); 338 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop"); 339 // Do copy 340 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 341 JVM_END 342 343 344 static void set_property(Handle props, const char* key, const char* value, TRAPS) { 345 JavaValue r(T_OBJECT); 346 // public synchronized Object put(Object key, Object value); 347 HandleMark hm(THREAD); 348 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 349 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 350 JavaCalls::call_virtual(&r, 351 props, 352 SystemDictionary::Properties_klass(), 353 vmSymbols::put_name(), 354 vmSymbols::object_object_object_signature(), 355 key_str, 356 value_str, 357 THREAD); 358 } 359 360 361 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 362 363 /* 364 * Return all of the system properties in a Java String array with alternating 365 * names and values from the jvm SystemProperty. 366 * Which includes some internal and all commandline -D defined properties. 367 */ 368 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env)) 369 JVMWrapper("JVM_GetProperties"); 370 ResourceMark rm(THREAD); 371 HandleMark hm(THREAD); 372 int ndx = 0; 373 int fixedCount = 2; 374 375 SystemProperty* p = Arguments::system_properties(); 376 int count = Arguments::PropertyList_count(p); 377 378 // Allocate result String array 379 InstanceKlass* ik = SystemDictionary::String_klass(); 380 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL); 381 objArrayHandle result_h(THREAD, r); 382 383 while (p != NULL) { 384 const char * key = p->key(); 385 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) { 386 const char * value = p->value(); 387 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL); 388 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL); 389 result_h->obj_at_put(ndx * 2, key_str()); 390 result_h->obj_at_put(ndx * 2 + 1, value_str()); 391 ndx++; 392 } 393 p = p->next(); 394 } 395 396 // Convert the -XX:MaxDirectMemorySize= command line flag 397 // to the sun.nio.MaxDirectMemorySize property. 398 // Do this after setting user properties to prevent people 399 // from setting the value with a -D option, as requested. 400 // Leave empty if not supplied 401 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 402 char as_chars[256]; 403 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 404 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL); 405 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL); 406 result_h->obj_at_put(ndx * 2, key_str()); 407 result_h->obj_at_put(ndx * 2 + 1, value_str()); 408 ndx++; 409 } 410 411 // JVM monitoring and management support 412 // Add the sun.management.compiler property for the compiler's name 413 { 414 #undef CSIZE 415 #if defined(_LP64) || defined(_WIN64) 416 #define CSIZE "64-Bit " 417 #else 418 #define CSIZE 419 #endif // 64bit 420 421 #ifdef TIERED 422 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 423 #else 424 #if defined(COMPILER1) 425 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 426 #elif defined(COMPILER2) 427 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 428 #elif INCLUDE_JVMCI 429 #error "INCLUDE_JVMCI should imply TIERED" 430 #else 431 const char* compiler_name = ""; 432 #endif // compilers 433 #endif // TIERED 434 435 if (*compiler_name != '\0' && 436 (Arguments::mode() != Arguments::_int)) { 437 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL); 438 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL); 439 result_h->obj_at_put(ndx * 2, key_str()); 440 result_h->obj_at_put(ndx * 2 + 1, value_str()); 441 ndx++; 442 } 443 } 444 445 return (jobjectArray) JNIHandles::make_local(env, result_h()); 446 JVM_END 447 448 449 /* 450 * Return the temporary directory that the VM uses for the attach 451 * and perf data files. 452 * 453 * It is important that this directory is well-known and the 454 * same for all VM instances. It cannot be affected by configuration 455 * variables such as java.io.tmpdir. 456 */ 457 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 458 JVMWrapper("JVM_GetTemporaryDirectory"); 459 HandleMark hm(THREAD); 460 const char* temp_dir = os::get_temp_directory(); 461 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 462 return (jstring) JNIHandles::make_local(env, h()); 463 JVM_END 464 465 466 // java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 467 468 extern volatile jint vm_created; 469 470 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt()) 471 JVMWrapper("JVM_BeforeHalt"); 472 EventShutdown event; 473 if (event.should_commit()) { 474 event.set_reason("Shutdown requested from Java"); 475 event.commit(); 476 } 477 JVM_END 478 479 480 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 481 before_exit(thread); 482 vm_exit(code); 483 JVM_END 484 485 486 JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 487 JVMWrapper("JVM_GC"); 488 if (!DisableExplicitGC) { 489 Universe::heap()->collect(GCCause::_java_lang_system_gc); 490 } 491 JVM_END 492 493 494 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 495 JVMWrapper("JVM_MaxObjectInspectionAge"); 496 return Universe::heap()->millis_since_last_gc(); 497 JVM_END 498 499 500 static inline jlong convert_size_t_to_jlong(size_t val) { 501 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 502 NOT_LP64 (return (jlong)val;) 503 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 504 } 505 506 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 507 JVMWrapper("JVM_TotalMemory"); 508 size_t n = Universe::heap()->capacity(); 509 return convert_size_t_to_jlong(n); 510 JVM_END 511 512 513 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 514 JVMWrapper("JVM_FreeMemory"); 515 size_t n = Universe::heap()->unused(); 516 return convert_size_t_to_jlong(n); 517 JVM_END 518 519 520 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 521 JVMWrapper("JVM_MaxMemory"); 522 size_t n = Universe::heap()->max_capacity(); 523 return convert_size_t_to_jlong(n); 524 JVM_END 525 526 527 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 528 JVMWrapper("JVM_ActiveProcessorCount"); 529 return os::active_processor_count(); 530 JVM_END 531 532 533 534 // java.lang.Throwable ////////////////////////////////////////////////////// 535 536 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 537 JVMWrapper("JVM_FillInStackTrace"); 538 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 539 java_lang_Throwable::fill_in_stack_trace(exception); 540 JVM_END 541 542 // java.lang.NullPointerException /////////////////////////////////////////// 543 544 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable)) 545 if (!ShowCodeDetailsInExceptionMessages) return NULL; 546 547 oop exc = JNIHandles::resolve_non_null(throwable); 548 549 Method* method; 550 int bci; 551 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) { 552 return NULL; 553 } 554 if (method->is_native()) { 555 return NULL; 556 } 557 558 stringStream ss; 559 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci); 560 if (ok) { 561 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL); 562 return (jstring) JNIHandles::make_local(env, result); 563 } else { 564 return NULL; 565 } 566 JVM_END 567 568 // java.lang.StackTraceElement ////////////////////////////////////////////// 569 570 571 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 572 JVMWrapper("JVM_InitStackTraceElementArray"); 573 Handle exception(THREAD, JNIHandles::resolve(throwable)); 574 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 575 objArrayHandle stack_trace(THREAD, st); 576 // Fill in the allocated stack trace 577 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 578 JVM_END 579 580 581 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 582 JVMWrapper("JVM_InitStackTraceElement"); 583 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 584 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 585 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 586 JVM_END 587 588 589 // java.lang.StackWalker ////////////////////////////////////////////////////// 590 591 592 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 593 jint skip_frames, jint frame_count, jint start_index, 594 jobjectArray frames)) 595 JVMWrapper("JVM_CallStackWalk"); 596 JavaThread* jt = (JavaThread*) THREAD; 597 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 598 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 599 } 600 601 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 602 603 // frames array is a Class<?>[] array when only getting caller reference, 604 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 605 // be null. 606 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 607 objArrayHandle frames_array_h(THREAD, fa); 608 609 int limit = start_index + frame_count; 610 if (frames_array_h->length() < limit) { 611 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 612 } 613 614 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 615 start_index, frames_array_h, CHECK_NULL); 616 return JNIHandles::make_local(env, result); 617 JVM_END 618 619 620 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 621 jint frame_count, jint start_index, 622 jobjectArray frames)) 623 JVMWrapper("JVM_MoreStackWalk"); 624 JavaThread* jt = (JavaThread*) THREAD; 625 626 // frames array is a Class<?>[] array when only getting caller reference, 627 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 628 // be null. 629 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 630 objArrayHandle frames_array_h(THREAD, fa); 631 632 int limit = start_index+frame_count; 633 if (frames_array_h->length() < limit) { 634 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 635 } 636 637 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 638 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 639 start_index, frames_array_h, THREAD); 640 JVM_END 641 642 // java.lang.Object /////////////////////////////////////////////// 643 644 645 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 646 JVMWrapper("JVM_IHashCode"); 647 // as implemented in the classic virtual machine; return 0 if object is NULL 648 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 649 JVM_END 650 651 652 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 653 JVMWrapper("JVM_MonitorWait"); 654 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 655 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 656 if (JvmtiExport::should_post_monitor_wait()) { 657 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 658 659 // The current thread already owns the monitor and it has not yet 660 // been added to the wait queue so the current thread cannot be 661 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 662 // event handler cannot accidentally consume an unpark() meant for 663 // the ParkEvent associated with this ObjectMonitor. 664 } 665 ObjectSynchronizer::wait(obj, ms, CHECK); 666 JVM_END 667 668 669 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 670 JVMWrapper("JVM_MonitorNotify"); 671 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 672 ObjectSynchronizer::notify(obj, CHECK); 673 JVM_END 674 675 676 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 677 JVMWrapper("JVM_MonitorNotifyAll"); 678 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 679 ObjectSynchronizer::notifyall(obj, CHECK); 680 JVM_END 681 682 683 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 684 JVMWrapper("JVM_Clone"); 685 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 686 Klass* klass = obj->klass(); 687 JvmtiVMObjectAllocEventCollector oam; 688 689 #ifdef ASSERT 690 // Just checking that the cloneable flag is set correct 691 if (obj->is_array()) { 692 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 693 } else { 694 guarantee(obj->is_instance(), "should be instanceOop"); 695 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 696 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 697 } 698 #endif 699 700 // Check if class of obj supports the Cloneable interface. 701 // All arrays are considered to be cloneable (See JLS 20.1.5). 702 // All j.l.r.Reference classes are considered non-cloneable. 703 if (!klass->is_cloneable() || 704 (klass->is_instance_klass() && 705 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) { 706 ResourceMark rm(THREAD); 707 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 708 } 709 710 // Make shallow object copy 711 const int size = obj->size(); 712 oop new_obj_oop = NULL; 713 if (obj->is_array()) { 714 const int length = ((arrayOop)obj())->length(); 715 new_obj_oop = Universe::heap()->array_allocate(klass, size, length, 716 /* do_zero */ true, CHECK_NULL); 717 } else { 718 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL); 719 } 720 721 HeapAccess<>::clone(obj(), new_obj_oop, size); 722 723 Handle new_obj(THREAD, new_obj_oop); 724 // Caution: this involves a java upcall, so the clone should be 725 // "gc-robust" by this stage. 726 if (klass->has_finalizer()) { 727 assert(obj->is_instance(), "should be instanceOop"); 728 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 729 new_obj = Handle(THREAD, new_obj_oop); 730 } 731 732 return JNIHandles::make_local(env, new_obj()); 733 JVM_END 734 735 // java.io.File /////////////////////////////////////////////////////////////// 736 737 JVM_LEAF(char*, JVM_NativePath(char* path)) 738 JVMWrapper("JVM_NativePath"); 739 return os::native_path(path); 740 JVM_END 741 742 743 // Misc. class handling /////////////////////////////////////////////////////////// 744 745 746 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env)) 747 JVMWrapper("JVM_GetCallerClass"); 748 749 // Getting the class of the caller frame. 750 // 751 // The call stack at this point looks something like this: 752 // 753 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 754 // [1] [ @CallerSensitive API.method ] 755 // [.] [ (skipped intermediate frames) ] 756 // [n] [ caller ] 757 vframeStream vfst(thread); 758 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 759 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 760 Method* m = vfst.method(); 761 assert(m != NULL, "sanity"); 762 switch (n) { 763 case 0: 764 // This must only be called from Reflection.getCallerClass 765 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 766 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 767 } 768 // fall-through 769 case 1: 770 // Frame 0 and 1 must be caller sensitive. 771 if (!m->caller_sensitive()) { 772 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 773 } 774 break; 775 default: 776 if (!m->is_ignored_by_security_stack_walk()) { 777 // We have reached the desired frame; return the holder class. 778 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 779 } 780 break; 781 } 782 } 783 return NULL; 784 JVM_END 785 786 787 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 788 JVMWrapper("JVM_FindPrimitiveClass"); 789 oop mirror = NULL; 790 BasicType t = name2type(utf); 791 if (t != T_ILLEGAL && !is_reference_type(t)) { 792 mirror = Universe::java_mirror(t); 793 } 794 if (mirror == NULL) { 795 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 796 } else { 797 return (jclass) JNIHandles::make_local(env, mirror); 798 } 799 JVM_END 800 801 802 // Returns a class loaded by the bootstrap class loader; or null 803 // if not found. ClassNotFoundException is not thrown. 804 // FindClassFromBootLoader is exported to the launcher for windows. 805 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 806 const char* name)) 807 JVMWrapper("JVM_FindClassFromBootLoader"); 808 809 // Java libraries should ensure that name is never null... 810 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 811 // It's impossible to create this class; the name cannot fit 812 // into the constant pool. 813 return NULL; 814 } 815 816 TempNewSymbol h_name = SymbolTable::new_symbol(name); 817 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 818 if (k == NULL) { 819 return NULL; 820 } 821 822 if (log_is_enabled(Debug, class, resolve)) { 823 trace_class_resolution(k); 824 } 825 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 826 JVM_END 827 828 // Find a class with this name in this loader, using the caller's protection domain. 829 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 830 jboolean init, jobject loader, 831 jclass caller)) 832 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 833 // Java libraries should ensure that name is never null... 834 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 835 // It's impossible to create this class; the name cannot fit 836 // into the constant pool. 837 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 838 } 839 840 TempNewSymbol h_name = SymbolTable::new_symbol(name); 841 842 oop loader_oop = JNIHandles::resolve(loader); 843 oop from_class = JNIHandles::resolve(caller); 844 oop protection_domain = NULL; 845 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 846 // NPE. Put it in another way, the bootstrap class loader has all permission and 847 // thus no checkPackageAccess equivalence in the VM class loader. 848 // The caller is also passed as NULL by the java code if there is no security 849 // manager to avoid the performance cost of getting the calling class. 850 if (from_class != NULL && loader_oop != NULL) { 851 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 852 } 853 854 Handle h_loader(THREAD, loader_oop); 855 Handle h_prot(THREAD, protection_domain); 856 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 857 h_prot, false, THREAD); 858 859 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 860 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 861 } 862 return result; 863 JVM_END 864 865 // Currently only called from the old verifier. 866 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 867 jboolean init, jclass from)) 868 JVMWrapper("JVM_FindClassFromClass"); 869 if (name == NULL) { 870 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given"); 871 } 872 if ((int)strlen(name) > Symbol::max_length()) { 873 // It's impossible to create this class; the name cannot fit 874 // into the constant pool. 875 Exceptions::fthrow(THREAD_AND_LOCATION, 876 vmSymbols::java_lang_NoClassDefFoundError(), 877 "Class name exceeds maximum length of %d: %s", 878 Symbol::max_length(), 879 name); 880 return 0; 881 } 882 TempNewSymbol h_name = SymbolTable::new_symbol(name); 883 oop from_class_oop = JNIHandles::resolve(from); 884 Klass* from_class = (from_class_oop == NULL) 885 ? (Klass*)NULL 886 : java_lang_Class::as_Klass(from_class_oop); 887 oop class_loader = NULL; 888 oop protection_domain = NULL; 889 if (from_class != NULL) { 890 class_loader = from_class->class_loader(); 891 protection_domain = from_class->protection_domain(); 892 } 893 Handle h_loader(THREAD, class_loader); 894 Handle h_prot (THREAD, protection_domain); 895 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 896 h_prot, true, thread); 897 898 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 899 // this function is generally only used for class loading during verification. 900 ResourceMark rm; 901 oop from_mirror = JNIHandles::resolve_non_null(from); 902 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 903 const char * from_name = from_class->external_name(); 904 905 oop mirror = JNIHandles::resolve_non_null(result); 906 Klass* to_class = java_lang_Class::as_Klass(mirror); 907 const char * to = to_class->external_name(); 908 log_debug(class, resolve)("%s %s (verification)", from_name, to); 909 } 910 911 return result; 912 JVM_END 913 914 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 915 if (loader.is_null()) { 916 return; 917 } 918 919 // check whether the current caller thread holds the lock or not. 920 // If not, increment the corresponding counter 921 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 922 ObjectSynchronizer::owner_self) { 923 counter->inc(); 924 } 925 } 926 927 // common code for JVM_DefineClass() and JVM_DefineClassWithSource() 928 static jclass jvm_define_class_common(JNIEnv *env, const char *name, 929 jobject loader, const jbyte *buf, 930 jsize len, jobject pd, const char *source, 931 TRAPS) { 932 if (source == NULL) source = "__JVM_DefineClass__"; 933 934 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 935 JavaThread* jt = (JavaThread*) THREAD; 936 937 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 938 ClassLoader::perf_define_appclass_selftime(), 939 ClassLoader::perf_define_appclasses(), 940 jt->get_thread_stat()->perf_recursion_counts_addr(), 941 jt->get_thread_stat()->perf_timers_addr(), 942 PerfClassTraceTime::DEFINE_CLASS); 943 944 if (UsePerfData) { 945 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 946 } 947 948 // Since exceptions can be thrown, class initialization can take place 949 // if name is NULL no check for class name in .class stream has to be made. 950 TempNewSymbol class_name = NULL; 951 if (name != NULL) { 952 const int str_len = (int)strlen(name); 953 if (str_len > Symbol::max_length()) { 954 // It's impossible to create this class; the name cannot fit 955 // into the constant pool. 956 Exceptions::fthrow(THREAD_AND_LOCATION, 957 vmSymbols::java_lang_NoClassDefFoundError(), 958 "Class name exceeds maximum length of %d: %s", 959 Symbol::max_length(), 960 name); 961 return 0; 962 } 963 class_name = SymbolTable::new_symbol(name, str_len); 964 } 965 966 ResourceMark rm(THREAD); 967 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 968 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 969 if (UsePerfData) { 970 is_lock_held_by_thread(class_loader, 971 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 972 THREAD); 973 } 974 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 975 Klass* k = SystemDictionary::resolve_from_stream(class_name, 976 class_loader, 977 protection_domain, 978 &st, 979 CHECK_NULL); 980 981 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 982 trace_class_resolution(k); 983 } 984 985 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 986 } 987 988 enum { 989 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS, 990 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS, 991 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK, 992 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS 993 }; 994 995 /* 996 * Define a class with the specified flags that indicates if it's a nestmate, 997 * hidden, or strongly referenced from class loader. 998 */ 999 static jclass jvm_lookup_define_class(JNIEnv *env, jclass lookup, const char *name, 1000 jobject loader, const jbyte *buf, jsize len, jobject pd, 1001 jboolean init, int flags, jobject classData, TRAPS) { 1002 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 1003 JavaThread* jt = (JavaThread*) THREAD; 1004 ResourceMark rm(THREAD); 1005 1006 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup)); 1007 // Lookup class must be a non-null instance 1008 if (lookup_k == NULL) { 1009 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1010 } 1011 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass"); 1012 1013 jboolean is_nestmate = (flags & NESTMATE) == NESTMATE; 1014 jboolean is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS; 1015 jboolean is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK; 1016 jboolean vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS; 1017 1018 InstanceKlass* host_class = NULL; 1019 if (is_nestmate) { 1020 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL); 1021 } 1022 1023 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s", 1024 name, 1025 is_nestmate ? "with dynamic nest-host " : "non-nestmate", 1026 is_nestmate ? host_class->external_name() : "", 1027 is_hidden ? "hidden" : "not hidden", 1028 is_strong ? "strong" : "weak", 1029 vm_annotations ? "with vm annotations" : "without vm annotation"); 1030 1031 if (!is_hidden) { 1032 // classData is only applicable for hidden classes 1033 if (classData != NULL) { 1034 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes"); 1035 } 1036 if (is_nestmate) { 1037 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes"); 1038 } 1039 if (!is_strong) { 1040 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader"); 1041 } 1042 if (vm_annotations) { 1043 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes"); 1044 } 1045 if (flags != STRONG_LOADER_LINK) { 1046 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1047 err_msg("invalid flag 0x%x", flags)); 1048 } 1049 } 1050 1051 1052 // Since exceptions can be thrown, class initialization can take place 1053 // if name is NULL no check for class name in .class stream has to be made. 1054 TempNewSymbol class_name = NULL; 1055 if (name != NULL) { 1056 const int str_len = (int)strlen(name); 1057 if (str_len > Symbol::max_length()) { 1058 // It's impossible to create this class; the name cannot fit 1059 // into the constant pool. 1060 Exceptions::fthrow(THREAD_AND_LOCATION, 1061 vmSymbols::java_lang_NoClassDefFoundError(), 1062 "Class name exceeds maximum length of %d: %s", 1063 Symbol::max_length(), 1064 name); 1065 return 0; 1066 } 1067 class_name = SymbolTable::new_symbol(name, str_len); 1068 } 1069 1070 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 1071 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 1072 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__"; 1073 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 1074 1075 Klass* defined_k; 1076 if (!is_hidden) { 1077 defined_k = SystemDictionary::resolve_from_stream(class_name, 1078 class_loader, 1079 protection_domain, 1080 &st, 1081 CHECK_NULL); 1082 1083 if (log_is_enabled(Debug, class, resolve) && defined_k != NULL) { 1084 trace_class_resolution(defined_k); 1085 } 1086 } else { // hidden 1087 Handle classData_h(THREAD, JNIHandles::resolve(classData)); 1088 ClassLoadInfo cl_info(protection_domain, 1089 NULL, // unsafe_anonymous_host 1090 NULL, // cp_patches 1091 host_class, 1092 classData_h, 1093 is_hidden, 1094 !is_strong, 1095 vm_annotations); 1096 defined_k = SystemDictionary::parse_stream(class_name, 1097 class_loader, 1098 &st, 1099 cl_info, 1100 CHECK_NULL); 1101 if (defined_k == NULL) { 1102 THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a hidden class"); 1103 } 1104 1105 // The hidden class loader data has been artificially been kept alive to 1106 // this point. The mirror and any instances of this class have to keep 1107 // it alive afterwards. 1108 InstanceKlass::cast(defined_k)->class_loader_data()->dec_keep_alive(); 1109 1110 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) { 1111 InstanceKlass* ik = InstanceKlass::cast(defined_k); 1112 ModuleEntry* module = ik->module(); 1113 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE; 1114 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s", 1115 module_name, 1116 ik->external_name(), 1117 host_class->external_name(), 1118 ik->is_hidden() ? "is hidden" : "is not hidden"); 1119 } 1120 } 1121 assert(Reflection::is_same_class_package(lookup_k, defined_k), 1122 "lookup class and defined class are in different packages"); 1123 1124 InstanceKlass* ik = InstanceKlass::cast(defined_k); 1125 if (init) { 1126 ik->initialize(CHECK_NULL); 1127 } else { 1128 ik->link_class(CHECK_NULL); 1129 } 1130 1131 return (jclass) JNIHandles::make_local(env, defined_k->java_mirror()); 1132 } 1133 1134 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 1135 JVMWrapper("JVM_DefineClass"); 1136 1137 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 1138 JVM_END 1139 1140 /* 1141 * Define a class with the specified lookup class. 1142 * lookup: Lookup class 1143 * name: the name of the class 1144 * loader: defining class loader 1145 * buf: class bytes 1146 * len: length of class bytes 1147 * pd: protection domain 1148 * init: initialize the class 1149 * flags: properties of the class 1150 * classData: private static pre-initialized field 1151 */ 1152 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, jobject loader, 1153 const jbyte *buf, jsize len, jobject pd, jboolean initialize, int flags, jobject classData)) 1154 JVMWrapper("JVM_LookupDefineClass"); 1155 1156 if (lookup == NULL) { 1157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1158 } 1159 1160 assert(buf != NULL, "buf must not be NULL"); 1161 1162 return jvm_lookup_define_class(env, lookup, name, loader, buf, len, pd, initialize, flags, classData, THREAD); 1163 JVM_END 1164 1165 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 1166 JVMWrapper("JVM_DefineClassWithSource"); 1167 1168 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 1169 JVM_END 1170 1171 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 1172 JVMWrapper("JVM_FindLoadedClass"); 1173 ResourceMark rm(THREAD); 1174 1175 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 1176 char* str = java_lang_String::as_utf8_string(h_name()); 1177 1178 // Sanity check, don't expect null 1179 if (str == NULL) return NULL; 1180 1181 // Internalize the string, converting '.' to '/' in string. 1182 char* p = (char*)str; 1183 while (*p != '\0') { 1184 if (*p == '.') { 1185 *p = '/'; 1186 } 1187 p++; 1188 } 1189 1190 const int str_len = (int)(p - str); 1191 if (str_len > Symbol::max_length()) { 1192 // It's impossible to create this class; the name cannot fit 1193 // into the constant pool. 1194 return NULL; 1195 } 1196 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len); 1197 1198 // Security Note: 1199 // The Java level wrapper will perform the necessary security check allowing 1200 // us to pass the NULL as the initiating class loader. 1201 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 1202 if (UsePerfData) { 1203 is_lock_held_by_thread(h_loader, 1204 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 1205 THREAD); 1206 } 1207 1208 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 1209 h_loader, 1210 Handle(), 1211 CHECK_NULL); 1212 #if INCLUDE_CDS 1213 if (k == NULL) { 1214 // If the class is not already loaded, try to see if it's in the shared 1215 // archive for the current classloader (h_loader). 1216 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL); 1217 } 1218 #endif 1219 return (k == NULL) ? NULL : 1220 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1221 JVM_END 1222 1223 // Module support ////////////////////////////////////////////////////////////////////////////// 1224 1225 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1226 jstring location, const char* const* packages, jsize num_packages)) 1227 JVMWrapper("JVM_DefineModule"); 1228 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK); 1229 JVM_END 1230 1231 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1232 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1233 Modules::set_bootloader_unnamed_module(module, CHECK); 1234 JVM_END 1235 1236 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1237 JVMWrapper("JVM_AddModuleExports"); 1238 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1239 JVM_END 1240 1241 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1242 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1243 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1244 JVM_END 1245 1246 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1247 JVMWrapper("JVM_AddModuleExportsToAll"); 1248 Modules::add_module_exports(from_module, package, NULL, CHECK); 1249 JVM_END 1250 1251 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1252 JVMWrapper("JVM_AddReadsModule"); 1253 Modules::add_reads_module(from_module, source_module, CHECK); 1254 JVM_END 1255 1256 // Reflection support ////////////////////////////////////////////////////////////////////////////// 1257 1258 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls)) 1259 assert (cls != NULL, "illegal class"); 1260 JVMWrapper("JVM_InitClassName"); 1261 JvmtiVMObjectAllocEventCollector oam; 1262 ResourceMark rm(THREAD); 1263 HandleMark hm(THREAD); 1264 Handle java_class(THREAD, JNIHandles::resolve(cls)); 1265 oop result = java_lang_Class::name(java_class, CHECK_NULL); 1266 return (jstring) JNIHandles::make_local(env, result); 1267 JVM_END 1268 1269 1270 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1271 JVMWrapper("JVM_GetClassInterfaces"); 1272 JvmtiVMObjectAllocEventCollector oam; 1273 oop mirror = JNIHandles::resolve_non_null(cls); 1274 1275 // Special handling for primitive objects 1276 if (java_lang_Class::is_primitive(mirror)) { 1277 // Primitive objects does not have any interfaces 1278 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1279 return (jobjectArray) JNIHandles::make_local(env, r); 1280 } 1281 1282 Klass* klass = java_lang_Class::as_Klass(mirror); 1283 // Figure size of result array 1284 int size; 1285 if (klass->is_instance_klass()) { 1286 size = InstanceKlass::cast(klass)->local_interfaces()->length(); 1287 } else { 1288 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1289 size = 2; 1290 } 1291 1292 // Allocate result array 1293 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1294 objArrayHandle result (THREAD, r); 1295 // Fill in result 1296 if (klass->is_instance_klass()) { 1297 // Regular instance klass, fill in all local interfaces 1298 for (int index = 0; index < size; index++) { 1299 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index); 1300 result->obj_at_put(index, k->java_mirror()); 1301 } 1302 } else { 1303 // All arrays implement java.lang.Cloneable and java.io.Serializable 1304 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1305 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1306 } 1307 return (jobjectArray) JNIHandles::make_local(env, result()); 1308 JVM_END 1309 1310 1311 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1312 JVMWrapper("JVM_IsInterface"); 1313 oop mirror = JNIHandles::resolve_non_null(cls); 1314 if (java_lang_Class::is_primitive(mirror)) { 1315 return JNI_FALSE; 1316 } 1317 Klass* k = java_lang_Class::as_Klass(mirror); 1318 jboolean result = k->is_interface(); 1319 assert(!result || k->is_instance_klass(), 1320 "all interfaces are instance types"); 1321 // The compiler intrinsic for isInterface tests the 1322 // Klass::_access_flags bits in the same way. 1323 return result; 1324 JVM_END 1325 1326 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls)) 1327 JVMWrapper("JVM_IsHiddenClass"); 1328 oop mirror = JNIHandles::resolve_non_null(cls); 1329 if (java_lang_Class::is_primitive(mirror)) { 1330 return JNI_FALSE; 1331 } 1332 Klass* k = java_lang_Class::as_Klass(mirror); 1333 return k->is_hidden(); 1334 JVM_END 1335 1336 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1337 JVMWrapper("JVM_GetClassSigners"); 1338 JvmtiVMObjectAllocEventCollector oam; 1339 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1340 // There are no signers for primitive types 1341 return NULL; 1342 } 1343 1344 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls))); 1345 1346 // If there are no signers set in the class, or if the class 1347 // is an array, return NULL. 1348 if (signers == NULL) return NULL; 1349 1350 // copy of the signers array 1351 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1352 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1353 for (int index = 0; index < signers->length(); index++) { 1354 signers_copy->obj_at_put(index, signers->obj_at(index)); 1355 } 1356 1357 // return the copy 1358 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1359 JVM_END 1360 1361 1362 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1363 JVMWrapper("JVM_SetClassSigners"); 1364 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1365 // This call is ignored for primitive types and arrays. 1366 // Signers are only set once, ClassLoader.java, and thus shouldn't 1367 // be called with an array. Only the bootstrap loader creates arrays. 1368 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1369 if (k->is_instance_klass()) { 1370 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1371 } 1372 } 1373 JVM_END 1374 1375 1376 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1377 JVMWrapper("JVM_GetProtectionDomain"); 1378 if (JNIHandles::resolve(cls) == NULL) { 1379 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1380 } 1381 1382 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1383 // Primitive types does not have a protection domain. 1384 return NULL; 1385 } 1386 1387 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1388 return (jobject) JNIHandles::make_local(env, pd); 1389 JVM_END 1390 1391 1392 // Returns the inherited_access_control_context field of the running thread. 1393 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1394 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1395 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1396 return JNIHandles::make_local(env, result); 1397 JVM_END 1398 1399 class RegisterArrayForGC { 1400 private: 1401 JavaThread *_thread; 1402 public: 1403 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1404 _thread = thread; 1405 _thread->register_array_for_gc(array); 1406 } 1407 1408 ~RegisterArrayForGC() { 1409 _thread->register_array_for_gc(NULL); 1410 } 1411 }; 1412 1413 1414 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1415 JVMWrapper("JVM_GetStackAccessControlContext"); 1416 if (!UsePrivilegedStack) return NULL; 1417 1418 ResourceMark rm(THREAD); 1419 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1420 JvmtiVMObjectAllocEventCollector oam; 1421 1422 // count the protection domains on the execution stack. We collapse 1423 // duplicate consecutive protection domains into a single one, as 1424 // well as stopping when we hit a privileged frame. 1425 1426 oop previous_protection_domain = NULL; 1427 Handle privileged_context(thread, NULL); 1428 bool is_privileged = false; 1429 oop protection_domain = NULL; 1430 1431 // Iterate through Java frames 1432 vframeStream vfst(thread); 1433 for(; !vfst.at_end(); vfst.next()) { 1434 // get method of frame 1435 Method* method = vfst.method(); 1436 1437 // stop at the first privileged frame 1438 if (method->method_holder() == SystemDictionary::AccessController_klass() && 1439 method->name() == vmSymbols::executePrivileged_name()) 1440 { 1441 // this frame is privileged 1442 is_privileged = true; 1443 1444 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged 1445 1446 StackValueCollection* locals = priv->locals(); 1447 StackValue* ctx_sv = locals->at(1); // AccessControlContext context 1448 StackValue* clr_sv = locals->at(2); // Class<?> caller 1449 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1450 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object"); 1451 privileged_context = ctx_sv->get_obj(); 1452 Handle caller = clr_sv->get_obj(); 1453 1454 Klass *caller_klass = java_lang_Class::as_Klass(caller()); 1455 protection_domain = caller_klass->protection_domain(); 1456 } else { 1457 protection_domain = method->method_holder()->protection_domain(); 1458 } 1459 1460 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1461 local_array->push(protection_domain); 1462 previous_protection_domain = protection_domain; 1463 } 1464 1465 if (is_privileged) break; 1466 } 1467 1468 1469 // either all the domains on the stack were system domains, or 1470 // we had a privileged system domain 1471 if (local_array->is_empty()) { 1472 if (is_privileged && privileged_context.is_null()) return NULL; 1473 1474 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1475 return JNIHandles::make_local(env, result); 1476 } 1477 1478 // the resource area must be registered in case of a gc 1479 RegisterArrayForGC ragc(thread, local_array); 1480 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1481 local_array->length(), CHECK_NULL); 1482 objArrayHandle h_context(thread, context); 1483 for (int index = 0; index < local_array->length(); index++) { 1484 h_context->obj_at_put(index, local_array->at(index)); 1485 } 1486 1487 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1488 1489 return JNIHandles::make_local(env, result); 1490 JVM_END 1491 1492 1493 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1494 JVMWrapper("JVM_IsArrayClass"); 1495 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1496 return (k != NULL) && k->is_array_klass() ? true : false; 1497 JVM_END 1498 1499 1500 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1501 JVMWrapper("JVM_IsPrimitiveClass"); 1502 oop mirror = JNIHandles::resolve_non_null(cls); 1503 return (jboolean) java_lang_Class::is_primitive(mirror); 1504 JVM_END 1505 1506 1507 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1508 JVMWrapper("JVM_GetClassModifiers"); 1509 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1510 // Primitive type 1511 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1512 } 1513 1514 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1515 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1516 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1517 return k->modifier_flags(); 1518 JVM_END 1519 1520 1521 // Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1522 1523 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1524 JvmtiVMObjectAllocEventCollector oam; 1525 // ofClass is a reference to a java_lang_Class object. The mirror object 1526 // of an InstanceKlass 1527 1528 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1529 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1530 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1531 return (jobjectArray)JNIHandles::make_local(env, result); 1532 } 1533 1534 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1535 InnerClassesIterator iter(k); 1536 1537 if (iter.length() == 0) { 1538 // Neither an inner nor outer class 1539 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1540 return (jobjectArray)JNIHandles::make_local(env, result); 1541 } 1542 1543 // find inner class info 1544 constantPoolHandle cp(thread, k->constants()); 1545 int length = iter.length(); 1546 1547 // Allocate temp. result array 1548 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1549 objArrayHandle result (THREAD, r); 1550 int members = 0; 1551 1552 for (; !iter.done(); iter.next()) { 1553 int ioff = iter.inner_class_info_index(); 1554 int ooff = iter.outer_class_info_index(); 1555 1556 if (ioff != 0 && ooff != 0) { 1557 // Check to see if the name matches the class we're looking for 1558 // before attempting to find the class. 1559 if (cp->klass_name_at_matches(k, ooff)) { 1560 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1561 if (outer_klass == k) { 1562 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1563 InstanceKlass* inner_klass = InstanceKlass::cast(ik); 1564 1565 // Throws an exception if outer klass has not declared k as 1566 // an inner klass 1567 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1568 1569 result->obj_at_put(members, inner_klass->java_mirror()); 1570 members++; 1571 } 1572 } 1573 } 1574 } 1575 1576 if (members != length) { 1577 // Return array of right length 1578 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1579 for(int i = 0; i < members; i++) { 1580 res->obj_at_put(i, result->obj_at(i)); 1581 } 1582 return (jobjectArray)JNIHandles::make_local(env, res); 1583 } 1584 1585 return (jobjectArray)JNIHandles::make_local(env, result()); 1586 JVM_END 1587 1588 1589 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1590 { 1591 // ofClass is a reference to a java_lang_Class object. 1592 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1593 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1594 return NULL; 1595 } 1596 1597 bool inner_is_member = false; 1598 Klass* outer_klass 1599 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1600 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1601 if (outer_klass == NULL) return NULL; // already a top-level class 1602 if (!inner_is_member) return NULL; // a hidden or unsafe anonymous class (inside a method) 1603 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1604 } 1605 JVM_END 1606 1607 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1608 { 1609 oop mirror = JNIHandles::resolve_non_null(cls); 1610 if (java_lang_Class::is_primitive(mirror) || 1611 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1612 return NULL; 1613 } 1614 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1615 int ooff = 0, noff = 0; 1616 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) { 1617 if (noff != 0) { 1618 constantPoolHandle i_cp(thread, k->constants()); 1619 Symbol* name = i_cp->symbol_at(noff); 1620 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1621 return (jstring) JNIHandles::make_local(env, str()); 1622 } 1623 } 1624 return NULL; 1625 } 1626 JVM_END 1627 1628 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1629 assert (cls != NULL, "illegal class"); 1630 JVMWrapper("JVM_GetClassSignature"); 1631 JvmtiVMObjectAllocEventCollector oam; 1632 ResourceMark rm(THREAD); 1633 // Return null for arrays and primatives 1634 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1635 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1636 if (k->is_instance_klass()) { 1637 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1638 if (sym == NULL) return NULL; 1639 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1640 return (jstring) JNIHandles::make_local(env, str()); 1641 } 1642 } 1643 return NULL; 1644 JVM_END 1645 1646 1647 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1648 assert (cls != NULL, "illegal class"); 1649 JVMWrapper("JVM_GetClassAnnotations"); 1650 1651 // Return null for arrays and primitives 1652 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1653 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1654 if (k->is_instance_klass()) { 1655 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1656 return (jbyteArray) JNIHandles::make_local(env, a); 1657 } 1658 } 1659 return NULL; 1660 JVM_END 1661 1662 1663 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1664 // some of this code was adapted from from jni_FromReflectedField 1665 1666 oop reflected = JNIHandles::resolve_non_null(field); 1667 oop mirror = java_lang_reflect_Field::clazz(reflected); 1668 Klass* k = java_lang_Class::as_Klass(mirror); 1669 int slot = java_lang_reflect_Field::slot(reflected); 1670 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1671 1672 InstanceKlass* ik = InstanceKlass::cast(k); 1673 intptr_t offset = ik->field_offset(slot); 1674 1675 if (modifiers & JVM_ACC_STATIC) { 1676 // for static fields we only look in the current class 1677 if (!ik->find_local_field_from_offset(offset, true, &fd)) { 1678 assert(false, "cannot find static field"); 1679 return false; 1680 } 1681 } else { 1682 // for instance fields we start with the current class and work 1683 // our way up through the superclass chain 1684 if (!ik->find_field_from_offset(offset, false, &fd)) { 1685 assert(false, "cannot find instance field"); 1686 return false; 1687 } 1688 } 1689 return true; 1690 } 1691 1692 static Method* jvm_get_method_common(jobject method) { 1693 // some of this code was adapted from from jni_FromReflectedMethod 1694 1695 oop reflected = JNIHandles::resolve_non_null(method); 1696 oop mirror = NULL; 1697 int slot = 0; 1698 1699 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1700 mirror = java_lang_reflect_Constructor::clazz(reflected); 1701 slot = java_lang_reflect_Constructor::slot(reflected); 1702 } else { 1703 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1704 "wrong type"); 1705 mirror = java_lang_reflect_Method::clazz(reflected); 1706 slot = java_lang_reflect_Method::slot(reflected); 1707 } 1708 Klass* k = java_lang_Class::as_Klass(mirror); 1709 1710 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1711 assert(m != NULL, "cannot find method"); 1712 return m; // caller has to deal with NULL in product mode 1713 } 1714 1715 /* Type use annotations support (JDK 1.8) */ 1716 1717 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1718 assert (cls != NULL, "illegal class"); 1719 JVMWrapper("JVM_GetClassTypeAnnotations"); 1720 ResourceMark rm(THREAD); 1721 // Return null for arrays and primitives 1722 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1723 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1724 if (k->is_instance_klass()) { 1725 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1726 if (type_annotations != NULL) { 1727 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1728 return (jbyteArray) JNIHandles::make_local(env, a); 1729 } 1730 } 1731 } 1732 return NULL; 1733 JVM_END 1734 1735 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1736 assert (method != NULL, "illegal method"); 1737 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1738 1739 // method is a handle to a java.lang.reflect.Method object 1740 Method* m = jvm_get_method_common(method); 1741 if (m == NULL) { 1742 return NULL; 1743 } 1744 1745 AnnotationArray* type_annotations = m->type_annotations(); 1746 if (type_annotations != NULL) { 1747 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1748 return (jbyteArray) JNIHandles::make_local(env, a); 1749 } 1750 1751 return NULL; 1752 JVM_END 1753 1754 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1755 assert (field != NULL, "illegal field"); 1756 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1757 1758 fieldDescriptor fd; 1759 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1760 if (!gotFd) { 1761 return NULL; 1762 } 1763 1764 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1765 JVM_END 1766 1767 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) { 1768 if (!cp->is_within_bounds(index)) { 1769 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1770 } 1771 } 1772 1773 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1774 { 1775 JVMWrapper("JVM_GetMethodParameters"); 1776 // method is a handle to a java.lang.reflect.Method object 1777 Method* method_ptr = jvm_get_method_common(method); 1778 methodHandle mh (THREAD, method_ptr); 1779 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1780 const int num_params = mh->method_parameters_length(); 1781 1782 if (num_params < 0) { 1783 // A -1 return value from method_parameters_length means there is no 1784 // parameter data. Return null to indicate this to the reflection 1785 // API. 1786 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1787 return (jobjectArray)NULL; 1788 } else { 1789 // Otherwise, we return something up to reflection, even if it is 1790 // a zero-length array. Why? Because in some cases this can 1791 // trigger a MalformedParametersException. 1792 1793 // make sure all the symbols are properly formatted 1794 for (int i = 0; i < num_params; i++) { 1795 MethodParametersElement* params = mh->method_parameters_start(); 1796 int index = params[i].name_cp_index; 1797 constantPoolHandle cp(THREAD, mh->constants()); 1798 bounds_check(cp, index, CHECK_NULL); 1799 1800 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1801 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1802 "Wrong type at constant pool index"); 1803 } 1804 1805 } 1806 1807 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1808 objArrayHandle result (THREAD, result_oop); 1809 1810 for (int i = 0; i < num_params; i++) { 1811 MethodParametersElement* params = mh->method_parameters_start(); 1812 // For a 0 index, give a NULL symbol 1813 Symbol* sym = 0 != params[i].name_cp_index ? 1814 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1815 int flags = params[i].flags; 1816 oop param = Reflection::new_parameter(reflected_method, i, sym, 1817 flags, CHECK_NULL); 1818 result->obj_at_put(i, param); 1819 } 1820 return (jobjectArray)JNIHandles::make_local(env, result()); 1821 } 1822 } 1823 JVM_END 1824 1825 // New (JDK 1.4) reflection implementation ///////////////////////////////////// 1826 1827 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1828 { 1829 JVMWrapper("JVM_GetClassDeclaredFields"); 1830 JvmtiVMObjectAllocEventCollector oam; 1831 1832 // Exclude primitive types and array types 1833 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1834 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1835 // Return empty array 1836 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1837 return (jobjectArray) JNIHandles::make_local(env, res); 1838 } 1839 1840 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1841 constantPoolHandle cp(THREAD, k->constants()); 1842 1843 // Ensure class is linked 1844 k->link_class(CHECK_NULL); 1845 1846 // Allocate result 1847 int num_fields; 1848 1849 if (publicOnly) { 1850 num_fields = 0; 1851 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1852 if (fs.access_flags().is_public()) ++num_fields; 1853 } 1854 } else { 1855 num_fields = k->java_fields_count(); 1856 } 1857 1858 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1859 objArrayHandle result (THREAD, r); 1860 1861 int out_idx = 0; 1862 fieldDescriptor fd; 1863 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1864 if (!publicOnly || fs.access_flags().is_public()) { 1865 fd.reinitialize(k, fs.index()); 1866 oop field = Reflection::new_field(&fd, CHECK_NULL); 1867 result->obj_at_put(out_idx, field); 1868 ++out_idx; 1869 } 1870 } 1871 assert(out_idx == num_fields, "just checking"); 1872 return (jobjectArray) JNIHandles::make_local(env, result()); 1873 } 1874 JVM_END 1875 1876 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls)) 1877 { 1878 JVMWrapper("JVM_IsRecord"); 1879 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1880 if (k != NULL && k->is_instance_klass()) { 1881 InstanceKlass* ik = InstanceKlass::cast(k); 1882 return ik->is_record(); 1883 } else { 1884 return false; 1885 } 1886 } 1887 JVM_END 1888 1889 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass)) 1890 { 1891 JVMWrapper("JVM_GetRecordComponents"); 1892 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)); 1893 assert(c->is_instance_klass(), "must be"); 1894 InstanceKlass* ik = InstanceKlass::cast(c); 1895 1896 if (ik->is_record()) { 1897 Array<RecordComponent*>* components = ik->record_components(); 1898 assert(components != NULL, "components should not be NULL"); 1899 { 1900 JvmtiVMObjectAllocEventCollector oam; 1901 constantPoolHandle cp(THREAD, ik->constants()); 1902 int length = components->length(); 1903 assert(length >= 0, "unexpected record_components length"); 1904 objArrayOop record_components = 1905 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL); 1906 objArrayHandle components_h (THREAD, record_components); 1907 1908 for (int x = 0; x < length; x++) { 1909 RecordComponent* component = components->at(x); 1910 assert(component != NULL, "unexpected NULL record component"); 1911 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL); 1912 components_h->obj_at_put(x, component_oop); 1913 } 1914 return (jobjectArray)JNIHandles::make_local(components_h()); 1915 } 1916 } 1917 1918 // Return empty array if ofClass is not a record. 1919 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL); 1920 return (jobjectArray)JNIHandles::make_local(env, result); 1921 } 1922 JVM_END 1923 1924 static bool select_method(const methodHandle& method, bool want_constructor) { 1925 if (want_constructor) { 1926 return (method->is_initializer() && !method->is_static()); 1927 } else { 1928 return (!method->is_initializer() && !method->is_overpass()); 1929 } 1930 } 1931 1932 static jobjectArray get_class_declared_methods_helper( 1933 JNIEnv *env, 1934 jclass ofClass, jboolean publicOnly, 1935 bool want_constructor, 1936 Klass* klass, TRAPS) { 1937 1938 JvmtiVMObjectAllocEventCollector oam; 1939 1940 // Exclude primitive types and array types 1941 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1942 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1943 // Return empty array 1944 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1945 return (jobjectArray) JNIHandles::make_local(env, res); 1946 } 1947 1948 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1949 1950 // Ensure class is linked 1951 k->link_class(CHECK_NULL); 1952 1953 Array<Method*>* methods = k->methods(); 1954 int methods_length = methods->length(); 1955 1956 // Save original method_idnum in case of redefinition, which can change 1957 // the idnum of obsolete methods. The new method will have the same idnum 1958 // but if we refresh the methods array, the counts will be wrong. 1959 ResourceMark rm(THREAD); 1960 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1961 int num_methods = 0; 1962 1963 for (int i = 0; i < methods_length; i++) { 1964 methodHandle method(THREAD, methods->at(i)); 1965 if (select_method(method, want_constructor)) { 1966 if (!publicOnly || method->is_public()) { 1967 idnums->push(method->method_idnum()); 1968 ++num_methods; 1969 } 1970 } 1971 } 1972 1973 // Allocate result 1974 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1975 objArrayHandle result (THREAD, r); 1976 1977 // Now just put the methods that we selected above, but go by their idnum 1978 // in case of redefinition. The methods can be redefined at any safepoint, 1979 // so above when allocating the oop array and below when creating reflect 1980 // objects. 1981 for (int i = 0; i < num_methods; i++) { 1982 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1983 if (method.is_null()) { 1984 // Method may have been deleted and seems this API can handle null 1985 // Otherwise should probably put a method that throws NSME 1986 result->obj_at_put(i, NULL); 1987 } else { 1988 oop m; 1989 if (want_constructor) { 1990 m = Reflection::new_constructor(method, CHECK_NULL); 1991 } else { 1992 m = Reflection::new_method(method, false, CHECK_NULL); 1993 } 1994 result->obj_at_put(i, m); 1995 } 1996 } 1997 1998 return (jobjectArray) JNIHandles::make_local(env, result()); 1999 } 2000 2001 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 2002 { 2003 JVMWrapper("JVM_GetClassDeclaredMethods"); 2004 return get_class_declared_methods_helper(env, ofClass, publicOnly, 2005 /*want_constructor*/ false, 2006 SystemDictionary::reflect_Method_klass(), THREAD); 2007 } 2008 JVM_END 2009 2010 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 2011 { 2012 JVMWrapper("JVM_GetClassDeclaredConstructors"); 2013 return get_class_declared_methods_helper(env, ofClass, publicOnly, 2014 /*want_constructor*/ true, 2015 SystemDictionary::reflect_Constructor_klass(), THREAD); 2016 } 2017 JVM_END 2018 2019 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 2020 { 2021 JVMWrapper("JVM_GetClassAccessFlags"); 2022 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 2023 // Primitive type 2024 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 2025 } 2026 2027 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2028 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 2029 } 2030 JVM_END 2031 2032 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member)) 2033 { 2034 JVMWrapper("JVM_AreNestMates"); 2035 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2036 assert(c->is_instance_klass(), "must be"); 2037 InstanceKlass* ck = InstanceKlass::cast(c); 2038 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member)); 2039 assert(m->is_instance_klass(), "must be"); 2040 InstanceKlass* mk = InstanceKlass::cast(m); 2041 return ck->has_nestmate_access_to(mk, THREAD); 2042 } 2043 JVM_END 2044 2045 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current)) 2046 { 2047 // current is not a primitive or array class 2048 JVMWrapper("JVM_GetNestHost"); 2049 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2050 assert(c->is_instance_klass(), "must be"); 2051 InstanceKlass* ck = InstanceKlass::cast(c); 2052 InstanceKlass* host = ck->nest_host(THREAD); 2053 return (jclass) (host == NULL ? NULL : 2054 JNIHandles::make_local(THREAD, host->java_mirror())); 2055 } 2056 JVM_END 2057 2058 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current)) 2059 { 2060 // current is not a primitive or array class 2061 JVMWrapper("JVM_GetNestMembers"); 2062 ResourceMark rm(THREAD); 2063 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current)); 2064 assert(c->is_instance_klass(), "must be"); 2065 InstanceKlass* ck = InstanceKlass::cast(c); 2066 InstanceKlass* host = ck->nest_host(THREAD); 2067 2068 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s", 2069 ck->external_name(), host->external_name()); 2070 { 2071 JvmtiVMObjectAllocEventCollector oam; 2072 Array<u2>* members = host->nest_members(); 2073 int length = members == NULL ? 0 : members->length(); 2074 2075 log_trace(class, nestmates)(" - host has %d listed nest members", length); 2076 2077 // nest host is first in the array so make it one bigger 2078 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 2079 length + 1, CHECK_NULL); 2080 objArrayHandle result(THREAD, r); 2081 result->obj_at_put(0, host->java_mirror()); 2082 if (length != 0) { 2083 int count = 0; 2084 for (int i = 0; i < length; i++) { 2085 int cp_index = members->at(i); 2086 Klass* k = host->constants()->klass_at(cp_index, THREAD); 2087 if (HAS_PENDING_EXCEPTION) { 2088 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) { 2089 return NULL; // propagate VMEs 2090 } 2091 if (log_is_enabled(Trace, class, nestmates)) { 2092 stringStream ss; 2093 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string(); 2094 ss.print(" - resolution of nest member %s failed: ", target_member_class); 2095 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 2096 log_trace(class, nestmates)("%s", ss.as_string()); 2097 } 2098 CLEAR_PENDING_EXCEPTION; 2099 continue; 2100 } 2101 if (k->is_instance_klass()) { 2102 InstanceKlass* ik = InstanceKlass::cast(k); 2103 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL); 2104 if (nest_host_k == host) { 2105 result->obj_at_put(count+1, k->java_mirror()); 2106 count++; 2107 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name()); 2108 } else { 2109 log_trace(class, nestmates)(" - skipping member %s with different host %s", 2110 ik->external_name(), nest_host_k->external_name()); 2111 } 2112 } else { 2113 log_trace(class, nestmates)(" - skipping member %s that is not an instance class", 2114 k->external_name()); 2115 } 2116 } 2117 if (count < length) { 2118 // we had invalid entries so we need to compact the array 2119 log_trace(class, nestmates)(" - compacting array from length %d to %d", 2120 length + 1, count + 1); 2121 2122 objArrayOop r2 = oopFactory::new_objArray(SystemDictionary::Class_klass(), 2123 count + 1, CHECK_NULL); 2124 objArrayHandle result2(THREAD, r2); 2125 for (int i = 0; i < count + 1; i++) { 2126 result2->obj_at_put(i, result->obj_at(i)); 2127 } 2128 return (jobjectArray)JNIHandles::make_local(THREAD, result2()); 2129 } 2130 } 2131 else { 2132 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate"); 2133 } 2134 return (jobjectArray)JNIHandles::make_local(THREAD, result()); 2135 } 2136 } 2137 JVM_END 2138 2139 // Constant pool access ////////////////////////////////////////////////////////// 2140 2141 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 2142 { 2143 JVMWrapper("JVM_GetClassConstantPool"); 2144 JvmtiVMObjectAllocEventCollector oam; 2145 2146 // Return null for primitives and arrays 2147 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 2148 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2149 if (k->is_instance_klass()) { 2150 InstanceKlass* k_h = InstanceKlass::cast(k); 2151 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 2152 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 2153 return JNIHandles::make_local(jcp()); 2154 } 2155 } 2156 return NULL; 2157 } 2158 JVM_END 2159 2160 2161 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 2162 { 2163 JVMWrapper("JVM_ConstantPoolGetSize"); 2164 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2165 return cp->length(); 2166 } 2167 JVM_END 2168 2169 2170 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2171 { 2172 JVMWrapper("JVM_ConstantPoolGetClassAt"); 2173 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2174 bounds_check(cp, index, CHECK_NULL); 2175 constantTag tag = cp->tag_at(index); 2176 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2177 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2178 } 2179 Klass* k = cp->klass_at(index, CHECK_NULL); 2180 return (jclass) JNIHandles::make_local(k->java_mirror()); 2181 } 2182 JVM_END 2183 2184 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2185 { 2186 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 2187 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2188 bounds_check(cp, index, CHECK_NULL); 2189 constantTag tag = cp->tag_at(index); 2190 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 2191 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2192 } 2193 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 2194 if (k == NULL) return NULL; 2195 return (jclass) JNIHandles::make_local(k->java_mirror()); 2196 } 2197 JVM_END 2198 2199 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) { 2200 constantTag tag = cp->tag_at(index); 2201 if (!tag.is_method() && !tag.is_interface_method()) { 2202 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2203 } 2204 int klass_ref = cp->uncached_klass_ref_index_at(index); 2205 Klass* k_o; 2206 if (force_resolution) { 2207 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2208 } else { 2209 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2210 if (k_o == NULL) return NULL; 2211 } 2212 InstanceKlass* k = InstanceKlass::cast(k_o); 2213 Symbol* name = cp->uncached_name_ref_at(index); 2214 Symbol* sig = cp->uncached_signature_ref_at(index); 2215 methodHandle m (THREAD, k->find_method(name, sig)); 2216 if (m.is_null()) { 2217 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 2218 } 2219 oop method; 2220 if (!m->is_initializer() || m->is_static()) { 2221 method = Reflection::new_method(m, true, CHECK_NULL); 2222 } else { 2223 method = Reflection::new_constructor(m, CHECK_NULL); 2224 } 2225 return JNIHandles::make_local(method); 2226 } 2227 2228 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2229 { 2230 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 2231 JvmtiVMObjectAllocEventCollector oam; 2232 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2233 bounds_check(cp, index, CHECK_NULL); 2234 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 2235 return res; 2236 } 2237 JVM_END 2238 2239 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2240 { 2241 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2242 JvmtiVMObjectAllocEventCollector oam; 2243 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2244 bounds_check(cp, index, CHECK_NULL); 2245 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2246 return res; 2247 } 2248 JVM_END 2249 2250 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2251 constantTag tag = cp->tag_at(index); 2252 if (!tag.is_field()) { 2253 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2254 } 2255 int klass_ref = cp->uncached_klass_ref_index_at(index); 2256 Klass* k_o; 2257 if (force_resolution) { 2258 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2259 } else { 2260 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2261 if (k_o == NULL) return NULL; 2262 } 2263 InstanceKlass* k = InstanceKlass::cast(k_o); 2264 Symbol* name = cp->uncached_name_ref_at(index); 2265 Symbol* sig = cp->uncached_signature_ref_at(index); 2266 fieldDescriptor fd; 2267 Klass* target_klass = k->find_field(name, sig, &fd); 2268 if (target_klass == NULL) { 2269 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2270 } 2271 oop field = Reflection::new_field(&fd, CHECK_NULL); 2272 return JNIHandles::make_local(field); 2273 } 2274 2275 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2276 { 2277 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2278 JvmtiVMObjectAllocEventCollector oam; 2279 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2280 bounds_check(cp, index, CHECK_NULL); 2281 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2282 return res; 2283 } 2284 JVM_END 2285 2286 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2287 { 2288 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2289 JvmtiVMObjectAllocEventCollector oam; 2290 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2291 bounds_check(cp, index, CHECK_NULL); 2292 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2293 return res; 2294 } 2295 JVM_END 2296 2297 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2298 { 2299 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2300 JvmtiVMObjectAllocEventCollector oam; 2301 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2302 bounds_check(cp, index, CHECK_NULL); 2303 constantTag tag = cp->tag_at(index); 2304 if (!tag.is_field_or_method()) { 2305 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2306 } 2307 int klass_ref = cp->uncached_klass_ref_index_at(index); 2308 Symbol* klass_name = cp->klass_name_at(klass_ref); 2309 Symbol* member_name = cp->uncached_name_ref_at(index); 2310 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2311 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2312 objArrayHandle dest(THREAD, dest_o); 2313 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2314 dest->obj_at_put(0, str()); 2315 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2316 dest->obj_at_put(1, str()); 2317 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2318 dest->obj_at_put(2, str()); 2319 return (jobjectArray) JNIHandles::make_local(dest()); 2320 } 2321 JVM_END 2322 2323 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2324 { 2325 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2326 JvmtiVMObjectAllocEventCollector oam; 2327 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2328 bounds_check(cp, index, CHECK_0); 2329 constantTag tag = cp->tag_at(index); 2330 if (!tag.is_field_or_method()) { 2331 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2332 } 2333 return (jint) cp->uncached_klass_ref_index_at(index); 2334 } 2335 JVM_END 2336 2337 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2338 { 2339 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2340 JvmtiVMObjectAllocEventCollector oam; 2341 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2342 bounds_check(cp, index, CHECK_0); 2343 constantTag tag = cp->tag_at(index); 2344 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2345 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2346 } 2347 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2348 } 2349 JVM_END 2350 2351 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2352 { 2353 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2354 JvmtiVMObjectAllocEventCollector oam; 2355 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2356 bounds_check(cp, index, CHECK_NULL); 2357 constantTag tag = cp->tag_at(index); 2358 if (!tag.is_name_and_type()) { 2359 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2360 } 2361 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2362 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2363 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2364 objArrayHandle dest(THREAD, dest_o); 2365 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2366 dest->obj_at_put(0, str()); 2367 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2368 dest->obj_at_put(1, str()); 2369 return (jobjectArray) JNIHandles::make_local(dest()); 2370 } 2371 JVM_END 2372 2373 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2374 { 2375 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2376 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2377 bounds_check(cp, index, CHECK_0); 2378 constantTag tag = cp->tag_at(index); 2379 if (!tag.is_int()) { 2380 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2381 } 2382 return cp->int_at(index); 2383 } 2384 JVM_END 2385 2386 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2387 { 2388 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2389 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2390 bounds_check(cp, index, CHECK_(0L)); 2391 constantTag tag = cp->tag_at(index); 2392 if (!tag.is_long()) { 2393 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2394 } 2395 return cp->long_at(index); 2396 } 2397 JVM_END 2398 2399 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2400 { 2401 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2402 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2403 bounds_check(cp, index, CHECK_(0.0f)); 2404 constantTag tag = cp->tag_at(index); 2405 if (!tag.is_float()) { 2406 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2407 } 2408 return cp->float_at(index); 2409 } 2410 JVM_END 2411 2412 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2413 { 2414 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2415 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2416 bounds_check(cp, index, CHECK_(0.0)); 2417 constantTag tag = cp->tag_at(index); 2418 if (!tag.is_double()) { 2419 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2420 } 2421 return cp->double_at(index); 2422 } 2423 JVM_END 2424 2425 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2426 { 2427 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2428 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2429 bounds_check(cp, index, CHECK_NULL); 2430 constantTag tag = cp->tag_at(index); 2431 if (!tag.is_string()) { 2432 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2433 } 2434 oop str = cp->string_at(index, CHECK_NULL); 2435 return (jstring) JNIHandles::make_local(str); 2436 } 2437 JVM_END 2438 2439 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2440 { 2441 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2442 JvmtiVMObjectAllocEventCollector oam; 2443 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2444 bounds_check(cp, index, CHECK_NULL); 2445 constantTag tag = cp->tag_at(index); 2446 if (!tag.is_symbol()) { 2447 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2448 } 2449 Symbol* sym = cp->symbol_at(index); 2450 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2451 return (jstring) JNIHandles::make_local(str()); 2452 } 2453 JVM_END 2454 2455 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2456 { 2457 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2458 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2459 bounds_check(cp, index, CHECK_0); 2460 constantTag tag = cp->tag_at(index); 2461 jbyte result = tag.value(); 2462 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2463 // they are changed to the corresponding tags from the JVM spec, so that java code in 2464 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2465 if (tag.is_klass_or_reference()) { 2466 result = JVM_CONSTANT_Class; 2467 } else if (tag.is_string_index()) { 2468 result = JVM_CONSTANT_String; 2469 } else if (tag.is_method_type_in_error()) { 2470 result = JVM_CONSTANT_MethodType; 2471 } else if (tag.is_method_handle_in_error()) { 2472 result = JVM_CONSTANT_MethodHandle; 2473 } else if (tag.is_dynamic_constant_in_error()) { 2474 result = JVM_CONSTANT_Dynamic; 2475 } 2476 return result; 2477 } 2478 JVM_END 2479 2480 // Assertion support. ////////////////////////////////////////////////////////// 2481 2482 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2483 JVMWrapper("JVM_DesiredAssertionStatus"); 2484 assert(cls != NULL, "bad class"); 2485 2486 oop r = JNIHandles::resolve(cls); 2487 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2488 if (java_lang_Class::is_primitive(r)) return false; 2489 2490 Klass* k = java_lang_Class::as_Klass(r); 2491 assert(k->is_instance_klass(), "must be an instance klass"); 2492 if (!k->is_instance_klass()) return false; 2493 2494 ResourceMark rm(THREAD); 2495 const char* name = k->name()->as_C_string(); 2496 bool system_class = k->class_loader() == NULL; 2497 return JavaAssertions::enabled(name, system_class); 2498 2499 JVM_END 2500 2501 2502 // Return a new AssertionStatusDirectives object with the fields filled in with 2503 // command-line assertion arguments (i.e., -ea, -da). 2504 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2505 JVMWrapper("JVM_AssertionStatusDirectives"); 2506 JvmtiVMObjectAllocEventCollector oam; 2507 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2508 return JNIHandles::make_local(env, asd); 2509 JVM_END 2510 2511 // Verification //////////////////////////////////////////////////////////////////////////////// 2512 2513 // Reflection for the verifier ///////////////////////////////////////////////////////////////// 2514 2515 // RedefineClasses support: bug 6214132 caused verification to fail. 2516 // All functions from this section should call the jvmtiThreadSate function: 2517 // Klass* class_to_verify_considering_redefinition(Klass* klass). 2518 // The function returns a Klass* of the _scratch_class if the verifier 2519 // was invoked in the middle of the class redefinition. 2520 // Otherwise it returns its argument value which is the _the_class Klass*. 2521 // Please, refer to the description in the jvmtiThreadSate.hpp. 2522 2523 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2524 JVMWrapper("JVM_GetClassNameUTF"); 2525 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2526 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2527 return k->name()->as_utf8(); 2528 JVM_END 2529 2530 2531 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2532 JVMWrapper("JVM_GetClassCPTypes"); 2533 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2534 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2535 // types will have length zero if this is not an InstanceKlass 2536 // (length is determined by call to JVM_GetClassCPEntriesCount) 2537 if (k->is_instance_klass()) { 2538 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2539 for (int index = cp->length() - 1; index >= 0; index--) { 2540 constantTag tag = cp->tag_at(index); 2541 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value(); 2542 } 2543 } 2544 JVM_END 2545 2546 2547 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2548 JVMWrapper("JVM_GetClassCPEntriesCount"); 2549 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2550 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2551 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2552 JVM_END 2553 2554 2555 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2556 JVMWrapper("JVM_GetClassFieldsCount"); 2557 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2558 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2559 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2560 JVM_END 2561 2562 2563 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2564 JVMWrapper("JVM_GetClassMethodsCount"); 2565 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2566 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2567 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2568 JVM_END 2569 2570 2571 // The following methods, used for the verifier, are never called with 2572 // array klasses, so a direct cast to InstanceKlass is safe. 2573 // Typically, these methods are called in a loop with bounds determined 2574 // by the results of JVM_GetClass{Fields,Methods}Count, which return 2575 // zero for arrays. 2576 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2577 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2578 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2579 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2580 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2581 int length = method->checked_exceptions_length(); 2582 if (length > 0) { 2583 CheckedExceptionElement* table= method->checked_exceptions_start(); 2584 for (int i = 0; i < length; i++) { 2585 exceptions[i] = table[i].class_cp_index; 2586 } 2587 } 2588 JVM_END 2589 2590 2591 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2592 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2593 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2594 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2595 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2596 return method->checked_exceptions_length(); 2597 JVM_END 2598 2599 2600 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2601 JVMWrapper("JVM_GetMethodIxByteCode"); 2602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2603 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2604 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2605 memcpy(code, method->code_base(), method->code_size()); 2606 JVM_END 2607 2608 2609 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2610 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2611 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2612 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2613 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2614 return method->code_size(); 2615 JVM_END 2616 2617 2618 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2619 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2620 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2621 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2622 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2623 ExceptionTable extable(method); 2624 entry->start_pc = extable.start_pc(entry_index); 2625 entry->end_pc = extable.end_pc(entry_index); 2626 entry->handler_pc = extable.handler_pc(entry_index); 2627 entry->catchType = extable.catch_type_index(entry_index); 2628 JVM_END 2629 2630 2631 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2632 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2633 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2634 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2635 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2636 return method->exception_table_length(); 2637 JVM_END 2638 2639 2640 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2641 JVMWrapper("JVM_GetMethodIxModifiers"); 2642 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2643 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2644 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2645 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2646 JVM_END 2647 2648 2649 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2650 JVMWrapper("JVM_GetFieldIxModifiers"); 2651 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2652 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2653 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2654 JVM_END 2655 2656 2657 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2658 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2659 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2660 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2661 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2662 return method->max_locals(); 2663 JVM_END 2664 2665 2666 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2667 JVMWrapper("JVM_GetMethodIxArgsSize"); 2668 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2669 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2670 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2671 return method->size_of_parameters(); 2672 JVM_END 2673 2674 2675 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2676 JVMWrapper("JVM_GetMethodIxMaxStack"); 2677 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2678 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2679 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2680 return method->verifier_max_stack(); 2681 JVM_END 2682 2683 2684 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2685 JVMWrapper("JVM_IsConstructorIx"); 2686 ResourceMark rm(THREAD); 2687 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2688 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2689 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2690 return method->name() == vmSymbols::object_initializer_name(); 2691 JVM_END 2692 2693 2694 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2695 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2696 ResourceMark rm(THREAD); 2697 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2698 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2699 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2700 return method->is_overpass(); 2701 JVM_END 2702 2703 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2704 JVMWrapper("JVM_GetMethodIxIxUTF"); 2705 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2706 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2707 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2708 return method->name()->as_utf8(); 2709 JVM_END 2710 2711 2712 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2713 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2714 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2715 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2716 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2717 return method->signature()->as_utf8(); 2718 JVM_END 2719 2720 /** 2721 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2722 * read entries in the constant pool. Since the old verifier always 2723 * works on a copy of the code, it will not see any rewriting that 2724 * may possibly occur in the middle of verification. So it is important 2725 * that nothing it calls tries to use the cpCache instead of the raw 2726 * constant pool, so we must use cp->uncached_x methods when appropriate. 2727 */ 2728 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2729 JVMWrapper("JVM_GetCPFieldNameUTF"); 2730 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2731 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2732 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2733 switch (cp->tag_at(cp_index).value()) { 2734 case JVM_CONSTANT_Fieldref: 2735 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2736 default: 2737 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2738 } 2739 ShouldNotReachHere(); 2740 return NULL; 2741 JVM_END 2742 2743 2744 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2745 JVMWrapper("JVM_GetCPMethodNameUTF"); 2746 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2747 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2748 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2749 switch (cp->tag_at(cp_index).value()) { 2750 case JVM_CONSTANT_InterfaceMethodref: 2751 case JVM_CONSTANT_Methodref: 2752 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2753 default: 2754 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2755 } 2756 ShouldNotReachHere(); 2757 return NULL; 2758 JVM_END 2759 2760 2761 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2762 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2763 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2764 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2765 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2766 switch (cp->tag_at(cp_index).value()) { 2767 case JVM_CONSTANT_InterfaceMethodref: 2768 case JVM_CONSTANT_Methodref: 2769 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2770 default: 2771 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2772 } 2773 ShouldNotReachHere(); 2774 return NULL; 2775 JVM_END 2776 2777 2778 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2779 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2780 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2781 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2782 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2783 switch (cp->tag_at(cp_index).value()) { 2784 case JVM_CONSTANT_Fieldref: 2785 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2786 default: 2787 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2788 } 2789 ShouldNotReachHere(); 2790 return NULL; 2791 JVM_END 2792 2793 2794 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2795 JVMWrapper("JVM_GetCPClassNameUTF"); 2796 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2797 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2798 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2799 Symbol* classname = cp->klass_name_at(cp_index); 2800 return classname->as_utf8(); 2801 JVM_END 2802 2803 2804 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2805 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2806 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2807 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2808 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2809 switch (cp->tag_at(cp_index).value()) { 2810 case JVM_CONSTANT_Fieldref: { 2811 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2812 Symbol* classname = cp->klass_name_at(class_index); 2813 return classname->as_utf8(); 2814 } 2815 default: 2816 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2817 } 2818 ShouldNotReachHere(); 2819 return NULL; 2820 JVM_END 2821 2822 2823 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2824 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2825 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2826 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2827 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2828 switch (cp->tag_at(cp_index).value()) { 2829 case JVM_CONSTANT_Methodref: 2830 case JVM_CONSTANT_InterfaceMethodref: { 2831 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2832 Symbol* classname = cp->klass_name_at(class_index); 2833 return classname->as_utf8(); 2834 } 2835 default: 2836 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2837 } 2838 ShouldNotReachHere(); 2839 return NULL; 2840 JVM_END 2841 2842 2843 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2844 JVMWrapper("JVM_GetCPFieldModifiers"); 2845 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2846 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2847 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2848 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2849 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2850 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2851 switch (cp->tag_at(cp_index).value()) { 2852 case JVM_CONSTANT_Fieldref: { 2853 Symbol* name = cp->uncached_name_ref_at(cp_index); 2854 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2855 InstanceKlass* ik = InstanceKlass::cast(k_called); 2856 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 2857 if (fs.name() == name && fs.signature() == signature) { 2858 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2859 } 2860 } 2861 return -1; 2862 } 2863 default: 2864 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2865 } 2866 ShouldNotReachHere(); 2867 return 0; 2868 JVM_END 2869 2870 2871 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2872 JVMWrapper("JVM_GetCPMethodModifiers"); 2873 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2874 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2875 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2876 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2877 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2878 switch (cp->tag_at(cp_index).value()) { 2879 case JVM_CONSTANT_Methodref: 2880 case JVM_CONSTANT_InterfaceMethodref: { 2881 Symbol* name = cp->uncached_name_ref_at(cp_index); 2882 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2883 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2884 int methods_count = methods->length(); 2885 for (int i = 0; i < methods_count; i++) { 2886 Method* method = methods->at(i); 2887 if (method->name() == name && method->signature() == signature) { 2888 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2889 } 2890 } 2891 return -1; 2892 } 2893 default: 2894 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2895 } 2896 ShouldNotReachHere(); 2897 return 0; 2898 JVM_END 2899 2900 2901 // Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2902 2903 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2904 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2905 JVM_END 2906 2907 2908 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2909 JVMWrapper("JVM_IsSameClassPackage"); 2910 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2911 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2912 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2913 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2914 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2915 JVM_END 2916 2917 // Printing support ////////////////////////////////////////////////// 2918 extern "C" { 2919 2920 ATTRIBUTE_PRINTF(3, 0) 2921 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2922 // Reject count values that are negative signed values converted to 2923 // unsigned; see bug 4399518, 4417214 2924 if ((intptr_t)count <= 0) return -1; 2925 2926 int result = os::vsnprintf(str, count, fmt, args); 2927 if (result > 0 && (size_t)result >= count) { 2928 result = -1; 2929 } 2930 2931 return result; 2932 } 2933 2934 ATTRIBUTE_PRINTF(3, 4) 2935 int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2936 va_list args; 2937 int len; 2938 va_start(args, fmt); 2939 len = jio_vsnprintf(str, count, fmt, args); 2940 va_end(args); 2941 return len; 2942 } 2943 2944 ATTRIBUTE_PRINTF(2, 3) 2945 int jio_fprintf(FILE* f, const char *fmt, ...) { 2946 int len; 2947 va_list args; 2948 va_start(args, fmt); 2949 len = jio_vfprintf(f, fmt, args); 2950 va_end(args); 2951 return len; 2952 } 2953 2954 ATTRIBUTE_PRINTF(2, 0) 2955 int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2956 if (Arguments::vfprintf_hook() != NULL) { 2957 return Arguments::vfprintf_hook()(f, fmt, args); 2958 } else { 2959 return vfprintf(f, fmt, args); 2960 } 2961 } 2962 2963 ATTRIBUTE_PRINTF(1, 2) 2964 JNIEXPORT int jio_printf(const char *fmt, ...) { 2965 int len; 2966 va_list args; 2967 va_start(args, fmt); 2968 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2969 va_end(args); 2970 return len; 2971 } 2972 2973 // HotSpot specific jio method 2974 void jio_print(const char* s, size_t len) { 2975 // Try to make this function as atomic as possible. 2976 if (Arguments::vfprintf_hook() != NULL) { 2977 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s); 2978 } else { 2979 // Make an unused local variable to avoid warning from gcc compiler. 2980 size_t count = ::write(defaultStream::output_fd(), s, (int)len); 2981 } 2982 } 2983 2984 } // Extern C 2985 2986 // java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2987 2988 // In most of the JVM thread support functions we need to access the 2989 // thread through a ThreadsListHandle to prevent it from exiting and 2990 // being reclaimed while we try to operate on it. The exceptions to this 2991 // rule are when operating on the current thread, or if the monitor of 2992 // the target java.lang.Thread is locked at the Java level - in both 2993 // cases the target cannot exit. 2994 2995 static void thread_entry(JavaThread* thread, TRAPS) { 2996 HandleMark hm(THREAD); 2997 Handle obj(THREAD, thread->threadObj()); 2998 JavaValue result(T_VOID); 2999 JavaCalls::call_virtual(&result, 3000 obj, 3001 SystemDictionary::Thread_klass(), 3002 vmSymbols::run_method_name(), 3003 vmSymbols::void_method_signature(), 3004 THREAD); 3005 } 3006 3007 3008 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 3009 JVMWrapper("JVM_StartThread"); 3010 JavaThread *native_thread = NULL; 3011 3012 // We cannot hold the Threads_lock when we throw an exception, 3013 // due to rank ordering issues. Example: we might need to grab the 3014 // Heap_lock while we construct the exception. 3015 bool throw_illegal_thread_state = false; 3016 3017 // We must release the Threads_lock before we can post a jvmti event 3018 // in Thread::start. 3019 { 3020 // Ensure that the C++ Thread and OSThread structures aren't freed before 3021 // we operate. 3022 MutexLocker mu(Threads_lock); 3023 3024 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 3025 // re-starting an already started thread, so we should usually find 3026 // that the JavaThread is null. However for a JNI attached thread 3027 // there is a small window between the Thread object being created 3028 // (with its JavaThread set) and the update to its threadStatus, so we 3029 // have to check for this 3030 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 3031 throw_illegal_thread_state = true; 3032 } else { 3033 // We could also check the stillborn flag to see if this thread was already stopped, but 3034 // for historical reasons we let the thread detect that itself when it starts running 3035 3036 jlong size = 3037 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 3038 // Allocate the C++ Thread structure and create the native thread. The 3039 // stack size retrieved from java is 64-bit signed, but the constructor takes 3040 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform. 3041 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX. 3042 // - Avoid passing negative values which would result in really large stacks. 3043 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;) 3044 size_t sz = size > 0 ? (size_t) size : 0; 3045 native_thread = new JavaThread(&thread_entry, sz); 3046 3047 // At this point it may be possible that no osthread was created for the 3048 // JavaThread due to lack of memory. Check for this situation and throw 3049 // an exception if necessary. Eventually we may want to change this so 3050 // that we only grab the lock if the thread was created successfully - 3051 // then we can also do this check and throw the exception in the 3052 // JavaThread constructor. 3053 if (native_thread->osthread() != NULL) { 3054 // Note: the current thread is not being used within "prepare". 3055 native_thread->prepare(jthread); 3056 } 3057 } 3058 } 3059 3060 if (throw_illegal_thread_state) { 3061 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 3062 } 3063 3064 assert(native_thread != NULL, "Starting null thread?"); 3065 3066 if (native_thread->osthread() == NULL) { 3067 // No one should hold a reference to the 'native_thread'. 3068 native_thread->smr_delete(); 3069 if (JvmtiExport::should_post_resource_exhausted()) { 3070 JvmtiExport::post_resource_exhausted( 3071 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 3072 os::native_thread_creation_failed_msg()); 3073 } 3074 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 3075 os::native_thread_creation_failed_msg()); 3076 } 3077 3078 #if INCLUDE_JFR 3079 if (JfrRecorder::is_recording() && EventThreadStart::is_enabled() && 3080 EventThreadStart::is_stacktrace_enabled()) { 3081 JfrThreadLocal* tl = native_thread->jfr_thread_local(); 3082 // skip Thread.start() and Thread.start0() 3083 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2)); 3084 } 3085 #endif 3086 3087 Thread::start(native_thread); 3088 3089 JVM_END 3090 3091 3092 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 3093 // before the quasi-asynchronous exception is delivered. This is a little obtrusive, 3094 // but is thought to be reliable and simple. In the case, where the receiver is the 3095 // same thread as the sender, no VM_Operation is needed. 3096 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 3097 JVMWrapper("JVM_StopThread"); 3098 3099 // A nested ThreadsListHandle will grab the Threads_lock so create 3100 // tlh before we resolve throwable. 3101 ThreadsListHandle tlh(thread); 3102 oop java_throwable = JNIHandles::resolve(throwable); 3103 if (java_throwable == NULL) { 3104 THROW(vmSymbols::java_lang_NullPointerException()); 3105 } 3106 oop java_thread = NULL; 3107 JavaThread* receiver = NULL; 3108 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3109 Events::log_exception(thread, 3110 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 3111 p2i(receiver), p2i(java_thread), p2i(throwable)); 3112 3113 if (is_alive) { 3114 // jthread refers to a live JavaThread. 3115 if (thread == receiver) { 3116 // Exception is getting thrown at self so no VM_Operation needed. 3117 THROW_OOP(java_throwable); 3118 } else { 3119 // Use a VM_Operation to throw the exception. 3120 Thread::send_async_exception(java_thread, java_throwable); 3121 } 3122 } else { 3123 // Either: 3124 // - target thread has not been started before being stopped, or 3125 // - target thread already terminated 3126 // We could read the threadStatus to determine which case it is 3127 // but that is overkill as it doesn't matter. We must set the 3128 // stillborn flag for the first case, and if the thread has already 3129 // exited setting this flag has no effect. 3130 java_lang_Thread::set_stillborn(java_thread); 3131 } 3132 JVM_END 3133 3134 3135 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 3136 JVMWrapper("JVM_IsThreadAlive"); 3137 3138 oop thread_oop = JNIHandles::resolve_non_null(jthread); 3139 return java_lang_Thread::is_alive(thread_oop); 3140 JVM_END 3141 3142 3143 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 3144 JVMWrapper("JVM_SuspendThread"); 3145 3146 ThreadsListHandle tlh(thread); 3147 JavaThread* receiver = NULL; 3148 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3149 if (is_alive) { 3150 // jthread refers to a live JavaThread. 3151 { 3152 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 3153 if (receiver->is_external_suspend()) { 3154 // Don't allow nested external suspend requests. We can't return 3155 // an error from this interface so just ignore the problem. 3156 return; 3157 } 3158 if (receiver->is_exiting()) { // thread is in the process of exiting 3159 return; 3160 } 3161 receiver->set_external_suspend(); 3162 } 3163 3164 // java_suspend() will catch threads in the process of exiting 3165 // and will ignore them. 3166 receiver->java_suspend(); 3167 3168 // It would be nice to have the following assertion in all the 3169 // time, but it is possible for a racing resume request to have 3170 // resumed this thread right after we suspended it. Temporarily 3171 // enable this assertion if you are chasing a different kind of 3172 // bug. 3173 // 3174 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 3175 // receiver->is_being_ext_suspended(), "thread is not suspended"); 3176 } 3177 JVM_END 3178 3179 3180 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 3181 JVMWrapper("JVM_ResumeThread"); 3182 3183 ThreadsListHandle tlh(thread); 3184 JavaThread* receiver = NULL; 3185 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3186 if (is_alive) { 3187 // jthread refers to a live JavaThread. 3188 3189 // This is the original comment for this Threads_lock grab: 3190 // We need to *always* get the threads lock here, since this operation cannot be allowed during 3191 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 3192 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 3193 // looks at it. 3194 // 3195 // The above comment dates back to when we had both internal and 3196 // external suspend APIs that shared a common underlying mechanism. 3197 // External suspend is now entirely cooperative and doesn't share 3198 // anything with internal suspend. That said, there are some 3199 // assumptions in the VM that an external resume grabs the 3200 // Threads_lock. We can't drop the Threads_lock grab here until we 3201 // resolve the assumptions that exist elsewhere. 3202 // 3203 MutexLocker ml(Threads_lock); 3204 receiver->java_resume(); 3205 } 3206 JVM_END 3207 3208 3209 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 3210 JVMWrapper("JVM_SetThreadPriority"); 3211 3212 ThreadsListHandle tlh(thread); 3213 oop java_thread = NULL; 3214 JavaThread* receiver = NULL; 3215 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread); 3216 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 3217 3218 if (is_alive) { 3219 // jthread refers to a live JavaThread. 3220 Thread::set_priority(receiver, (ThreadPriority)prio); 3221 } 3222 // Implied else: If the JavaThread hasn't started yet, then the 3223 // priority set in the java.lang.Thread object above will be pushed 3224 // down when it does start. 3225 JVM_END 3226 3227 3228 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 3229 JVMWrapper("JVM_Yield"); 3230 if (os::dont_yield()) return; 3231 HOTSPOT_THREAD_YIELD(); 3232 os::naked_yield(); 3233 JVM_END 3234 3235 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) { 3236 assert(event != NULL, "invariant"); 3237 assert(event->should_commit(), "invariant"); 3238 event->set_time(millis); 3239 event->commit(); 3240 } 3241 3242 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 3243 JVMWrapper("JVM_Sleep"); 3244 3245 if (millis < 0) { 3246 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 3247 } 3248 3249 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) { 3250 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3251 } 3252 3253 // Save current thread state and restore it at the end of this block. 3254 // And set new thread state to SLEEPING. 3255 JavaThreadSleepState jtss(thread); 3256 3257 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 3258 EventThreadSleep event; 3259 3260 if (millis == 0) { 3261 os::naked_yield(); 3262 } else { 3263 ThreadState old_state = thread->osthread()->get_state(); 3264 thread->osthread()->set_state(SLEEPING); 3265 if (!thread->sleep(millis)) { // interrupted 3266 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3267 // us while we were sleeping. We do not overwrite those. 3268 if (!HAS_PENDING_EXCEPTION) { 3269 if (event.should_commit()) { 3270 post_thread_sleep_event(&event, millis); 3271 } 3272 HOTSPOT_THREAD_SLEEP_END(1); 3273 3274 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3275 // to properly restore the thread state. That's likely wrong. 3276 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3277 } 3278 } 3279 thread->osthread()->set_state(old_state); 3280 } 3281 if (event.should_commit()) { 3282 post_thread_sleep_event(&event, millis); 3283 } 3284 HOTSPOT_THREAD_SLEEP_END(0); 3285 JVM_END 3286 3287 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3288 JVMWrapper("JVM_CurrentThread"); 3289 oop jthread = thread->threadObj(); 3290 assert (thread != NULL, "no current thread!"); 3291 return JNIHandles::make_local(env, jthread); 3292 JVM_END 3293 3294 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3295 JVMWrapper("JVM_Interrupt"); 3296 3297 ThreadsListHandle tlh(thread); 3298 JavaThread* receiver = NULL; 3299 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL); 3300 if (is_alive) { 3301 // jthread refers to a live JavaThread. 3302 receiver->interrupt(); 3303 } 3304 JVM_END 3305 3306 3307 // Return true iff the current thread has locked the object passed in 3308 3309 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3310 JVMWrapper("JVM_HoldsLock"); 3311 assert(THREAD->is_Java_thread(), "sanity check"); 3312 if (obj == NULL) { 3313 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3314 } 3315 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3316 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3317 JVM_END 3318 3319 3320 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3321 JVMWrapper("JVM_DumpAllStacks"); 3322 VM_PrintThreads op; 3323 VMThread::execute(&op); 3324 if (JvmtiExport::should_post_data_dump()) { 3325 JvmtiExport::post_data_dump(); 3326 } 3327 JVM_END 3328 3329 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3330 JVMWrapper("JVM_SetNativeThreadName"); 3331 3332 // We don't use a ThreadsListHandle here because the current thread 3333 // must be alive. 3334 oop java_thread = JNIHandles::resolve_non_null(jthread); 3335 JavaThread* thr = java_lang_Thread::thread(java_thread); 3336 if (thread == thr && !thr->has_attached_via_jni()) { 3337 // Thread naming is only supported for the current thread and 3338 // we don't set the name of an attached thread to avoid stepping 3339 // on other programs. 3340 ResourceMark rm(thread); 3341 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3342 os::set_native_thread_name(thread_name); 3343 } 3344 JVM_END 3345 3346 // java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3347 3348 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3349 JVMWrapper("JVM_GetClassContext"); 3350 ResourceMark rm(THREAD); 3351 JvmtiVMObjectAllocEventCollector oam; 3352 vframeStream vfst(thread); 3353 3354 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3355 // This must only be called from SecurityManager.getClassContext 3356 Method* m = vfst.method(); 3357 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3358 m->name() == vmSymbols::getClassContext_name() && 3359 m->signature() == vmSymbols::void_class_array_signature())) { 3360 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3361 } 3362 } 3363 3364 // Collect method holders 3365 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>(); 3366 for (; !vfst.at_end(); vfst.security_next()) { 3367 Method* m = vfst.method(); 3368 // Native frames are not returned 3369 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3370 Klass* holder = m->method_holder(); 3371 assert(holder->is_klass(), "just checking"); 3372 klass_array->append(holder); 3373 } 3374 } 3375 3376 // Create result array of type [Ljava/lang/Class; 3377 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3378 // Fill in mirrors corresponding to method holders 3379 for (int i = 0; i < klass_array->length(); i++) { 3380 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3381 } 3382 3383 return (jobjectArray) JNIHandles::make_local(env, result); 3384 JVM_END 3385 3386 3387 // java.lang.Package //////////////////////////////////////////////////////////////// 3388 3389 3390 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3391 JVMWrapper("JVM_GetSystemPackage"); 3392 ResourceMark rm(THREAD); 3393 JvmtiVMObjectAllocEventCollector oam; 3394 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3395 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3396 return (jstring) JNIHandles::make_local(result); 3397 JVM_END 3398 3399 3400 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3401 JVMWrapper("JVM_GetSystemPackages"); 3402 JvmtiVMObjectAllocEventCollector oam; 3403 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3404 return (jobjectArray) JNIHandles::make_local(result); 3405 JVM_END 3406 3407 3408 // java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3409 3410 3411 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3412 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3413 3414 MonitorLocker ml(Heap_lock); 3415 oop ref = Universe::reference_pending_list(); 3416 if (ref != NULL) { 3417 Universe::set_reference_pending_list(NULL); 3418 } 3419 return JNIHandles::make_local(env, ref); 3420 JVM_END 3421 3422 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3423 JVMWrapper("JVM_HasReferencePendingList"); 3424 MonitorLocker ml(Heap_lock); 3425 return Universe::has_reference_pending_list(); 3426 JVM_END 3427 3428 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3429 JVMWrapper("JVM_WaitForReferencePendingList"); 3430 MonitorLocker ml(Heap_lock); 3431 while (!Universe::has_reference_pending_list()) { 3432 ml.wait(); 3433 } 3434 JVM_END 3435 3436 3437 // ObjectInputStream /////////////////////////////////////////////////////////////// 3438 3439 // Return the first user-defined class loader up the execution stack, or null 3440 // if only code from the bootstrap or platform class loader is on the stack. 3441 3442 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3443 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3444 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3445 oop loader = vfst.method()->method_holder()->class_loader(); 3446 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3447 return JNIHandles::make_local(env, loader); 3448 } 3449 } 3450 return NULL; 3451 JVM_END 3452 3453 3454 // Array /////////////////////////////////////////////////////////////////////////////////////////// 3455 3456 3457 // resolve array handle and check arguments 3458 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3459 if (arr == NULL) { 3460 THROW_0(vmSymbols::java_lang_NullPointerException()); 3461 } 3462 oop a = JNIHandles::resolve_non_null(arr); 3463 if (!a->is_array()) { 3464 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3465 } else if (type_array_only && !a->is_typeArray()) { 3466 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3467 } 3468 return arrayOop(a); 3469 } 3470 3471 3472 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3473 JVMWrapper("JVM_GetArrayLength"); 3474 arrayOop a = check_array(env, arr, false, CHECK_0); 3475 return a->length(); 3476 JVM_END 3477 3478 3479 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3480 JVMWrapper("JVM_Array_Get"); 3481 JvmtiVMObjectAllocEventCollector oam; 3482 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3483 jvalue value; 3484 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3485 oop box = Reflection::box(&value, type, CHECK_NULL); 3486 return JNIHandles::make_local(env, box); 3487 JVM_END 3488 3489 3490 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3491 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3492 jvalue value; 3493 value.i = 0; // to initialize value before getting used in CHECK 3494 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3495 assert(a->is_typeArray(), "just checking"); 3496 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3497 BasicType wide_type = (BasicType) wCode; 3498 if (type != wide_type) { 3499 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3500 } 3501 return value; 3502 JVM_END 3503 3504 3505 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3506 JVMWrapper("JVM_SetArrayElement"); 3507 arrayOop a = check_array(env, arr, false, CHECK); 3508 oop box = JNIHandles::resolve(val); 3509 jvalue value; 3510 value.i = 0; // to initialize value before getting used in CHECK 3511 BasicType value_type; 3512 if (a->is_objArray()) { 3513 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3514 value_type = Reflection::unbox_for_regular_object(box, &value); 3515 } else { 3516 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3517 } 3518 Reflection::array_set(&value, a, index, value_type, CHECK); 3519 JVM_END 3520 3521 3522 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3523 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3524 arrayOop a = check_array(env, arr, true, CHECK); 3525 assert(a->is_typeArray(), "just checking"); 3526 BasicType value_type = (BasicType) vCode; 3527 Reflection::array_set(&v, a, index, value_type, CHECK); 3528 JVM_END 3529 3530 3531 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3532 JVMWrapper("JVM_NewArray"); 3533 JvmtiVMObjectAllocEventCollector oam; 3534 oop element_mirror = JNIHandles::resolve(eltClass); 3535 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3536 return JNIHandles::make_local(env, result); 3537 JVM_END 3538 3539 3540 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3541 JVMWrapper("JVM_NewMultiArray"); 3542 JvmtiVMObjectAllocEventCollector oam; 3543 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3544 oop element_mirror = JNIHandles::resolve(eltClass); 3545 assert(dim_array->is_typeArray(), "just checking"); 3546 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3547 return JNIHandles::make_local(env, result); 3548 JVM_END 3549 3550 3551 // Library support /////////////////////////////////////////////////////////////////////////// 3552 3553 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3554 //%note jvm_ct 3555 JVMWrapper("JVM_LoadLibrary"); 3556 char ebuf[1024]; 3557 void *load_result; 3558 { 3559 ThreadToNativeFromVM ttnfvm(thread); 3560 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3561 } 3562 if (load_result == NULL) { 3563 char msg[1024]; 3564 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3565 // Since 'ebuf' may contain a string encoded using 3566 // platform encoding scheme, we need to pass 3567 // Exceptions::unsafe_to_utf8 to the new_exception method 3568 // as the last argument. See bug 6367357. 3569 Handle h_exception = 3570 Exceptions::new_exception(thread, 3571 vmSymbols::java_lang_UnsatisfiedLinkError(), 3572 msg, Exceptions::unsafe_to_utf8); 3573 3574 THROW_HANDLE_0(h_exception); 3575 } 3576 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result)); 3577 return load_result; 3578 JVM_END 3579 3580 3581 JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3582 JVMWrapper("JVM_UnloadLibrary"); 3583 os::dll_unload(handle); 3584 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle)); 3585 JVM_END 3586 3587 3588 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3589 JVMWrapper("JVM_FindLibraryEntry"); 3590 void* find_result = os::dll_lookup(handle, name); 3591 log_info(library)("%s %s in library with handle " INTPTR_FORMAT, 3592 find_result != NULL ? "Found" : "Failed to find", 3593 name, p2i(handle)); 3594 return find_result; 3595 JVM_END 3596 3597 3598 // JNI version /////////////////////////////////////////////////////////////////////////////// 3599 3600 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3601 JVMWrapper("JVM_IsSupportedJNIVersion"); 3602 return Threads::is_supported_jni_version_including_1_1(version); 3603 JVM_END 3604 3605 3606 // String support /////////////////////////////////////////////////////////////////////////// 3607 3608 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3609 JVMWrapper("JVM_InternString"); 3610 JvmtiVMObjectAllocEventCollector oam; 3611 if (str == NULL) return NULL; 3612 oop string = JNIHandles::resolve_non_null(str); 3613 oop result = StringTable::intern(string, CHECK_NULL); 3614 return (jstring) JNIHandles::make_local(env, result); 3615 JVM_END 3616 3617 3618 // VM Raw monitor support ////////////////////////////////////////////////////////////////////// 3619 3620 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion 3621 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK 3622 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate 3623 // in the safepoint protocol, thread suspension, thread interruption, or anything of that 3624 // nature. JavaThreads will be "in native" when using this API from JDK code. 3625 3626 3627 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3628 VM_Exit::block_if_vm_exited(); 3629 JVMWrapper("JVM_RawMonitorCreate"); 3630 return new os::PlatformMutex(); 3631 } 3632 3633 3634 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3635 VM_Exit::block_if_vm_exited(); 3636 JVMWrapper("JVM_RawMonitorDestroy"); 3637 delete ((os::PlatformMutex*) mon); 3638 } 3639 3640 3641 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3642 VM_Exit::block_if_vm_exited(); 3643 JVMWrapper("JVM_RawMonitorEnter"); 3644 ((os::PlatformMutex*) mon)->lock(); 3645 return 0; 3646 } 3647 3648 3649 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3650 VM_Exit::block_if_vm_exited(); 3651 JVMWrapper("JVM_RawMonitorExit"); 3652 ((os::PlatformMutex*) mon)->unlock(); 3653 } 3654 3655 3656 // Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3657 3658 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3659 Handle loader, Handle protection_domain, 3660 jboolean throwError, TRAPS) { 3661 // Security Note: 3662 // The Java level wrapper will perform the necessary security check allowing 3663 // us to pass the NULL as the initiating class loader. The VM is responsible for 3664 // the checkPackageAccess relative to the initiating class loader via the 3665 // protection_domain. The protection_domain is passed as NULL by the java code 3666 // if there is no security manager in 3-arg Class.forName(). 3667 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3668 3669 // Check if we should initialize the class 3670 if (init && klass->is_instance_klass()) { 3671 klass->initialize(CHECK_NULL); 3672 } 3673 return (jclass) JNIHandles::make_local(env, klass->java_mirror()); 3674 } 3675 3676 3677 // Method /////////////////////////////////////////////////////////////////////////////////////////// 3678 3679 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3680 JVMWrapper("JVM_InvokeMethod"); 3681 Handle method_handle; 3682 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3683 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3684 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3685 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3686 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3687 jobject res = JNIHandles::make_local(env, result); 3688 if (JvmtiExport::should_post_vm_object_alloc()) { 3689 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3690 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3691 if (java_lang_Class::is_primitive(ret_type)) { 3692 // Only for primitive type vm allocates memory for java object. 3693 // See box() method. 3694 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3695 } 3696 } 3697 return res; 3698 } else { 3699 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3700 } 3701 JVM_END 3702 3703 3704 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3705 JVMWrapper("JVM_NewInstanceFromConstructor"); 3706 oop constructor_mirror = JNIHandles::resolve(c); 3707 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3708 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3709 jobject res = JNIHandles::make_local(env, result); 3710 if (JvmtiExport::should_post_vm_object_alloc()) { 3711 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3712 } 3713 return res; 3714 JVM_END 3715 3716 // Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3717 3718 JVM_LEAF(jboolean, JVM_SupportsCX8()) 3719 JVMWrapper("JVM_SupportsCX8"); 3720 return VM_Version::supports_cx8(); 3721 JVM_END 3722 3723 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls)) 3724 JVMWrapper("JVM_InitializeFromArchive"); 3725 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 3726 assert(k->is_klass(), "just checking"); 3727 HeapShared::initialize_from_archived_subgraph(k); 3728 JVM_END 3729 3730 // Returns an array of all live Thread objects (VM internal JavaThreads, 3731 // jvmti agent threads, and JNI attaching threads are skipped) 3732 // See CR 6404306 regarding JNI attaching threads 3733 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3734 ResourceMark rm(THREAD); 3735 ThreadsListEnumerator tle(THREAD, false, false); 3736 JvmtiVMObjectAllocEventCollector oam; 3737 3738 int num_threads = tle.num_threads(); 3739 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3740 objArrayHandle threads_ah(THREAD, r); 3741 3742 for (int i = 0; i < num_threads; i++) { 3743 Handle h = tle.get_threadObj(i); 3744 threads_ah->obj_at_put(i, h()); 3745 } 3746 3747 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3748 JVM_END 3749 3750 3751 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3752 // Return StackTraceElement[][], each element is the stack trace of a thread in 3753 // the corresponding entry in the given threads array 3754 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3755 JVMWrapper("JVM_DumpThreads"); 3756 JvmtiVMObjectAllocEventCollector oam; 3757 3758 // Check if threads is null 3759 if (threads == NULL) { 3760 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3761 } 3762 3763 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3764 objArrayHandle ah(THREAD, a); 3765 int num_threads = ah->length(); 3766 // check if threads is non-empty array 3767 if (num_threads == 0) { 3768 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3769 } 3770 3771 // check if threads is not an array of objects of Thread class 3772 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3773 if (k != SystemDictionary::Thread_klass()) { 3774 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3775 } 3776 3777 ResourceMark rm(THREAD); 3778 3779 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3780 for (int i = 0; i < num_threads; i++) { 3781 oop thread_obj = ah->obj_at(i); 3782 instanceHandle h(THREAD, (instanceOop) thread_obj); 3783 thread_handle_array->append(h); 3784 } 3785 3786 // The JavaThread references in thread_handle_array are validated 3787 // in VM_ThreadDump::doit(). 3788 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3789 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3790 3791 JVM_END 3792 3793 // JVM monitoring and management support 3794 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3795 return Management::get_jmm_interface(version); 3796 JVM_END 3797 3798 // com.sun.tools.attach.VirtualMachine agent properties support 3799 // 3800 // Initialize the agent properties with the properties maintained in the VM 3801 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3802 JVMWrapper("JVM_InitAgentProperties"); 3803 ResourceMark rm; 3804 3805 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3806 3807 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3808 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3809 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3810 return properties; 3811 JVM_END 3812 3813 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3814 { 3815 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3816 JvmtiVMObjectAllocEventCollector oam; 3817 3818 if (ofClass == NULL) { 3819 return NULL; 3820 } 3821 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3822 // Special handling for primitive objects 3823 if (java_lang_Class::is_primitive(mirror())) { 3824 return NULL; 3825 } 3826 Klass* k = java_lang_Class::as_Klass(mirror()); 3827 if (!k->is_instance_klass()) { 3828 return NULL; 3829 } 3830 InstanceKlass* ik = InstanceKlass::cast(k); 3831 int encl_method_class_idx = ik->enclosing_method_class_index(); 3832 if (encl_method_class_idx == 0) { 3833 return NULL; 3834 } 3835 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3836 objArrayHandle dest(THREAD, dest_o); 3837 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3838 dest->obj_at_put(0, enc_k->java_mirror()); 3839 int encl_method_method_idx = ik->enclosing_method_method_index(); 3840 if (encl_method_method_idx != 0) { 3841 Symbol* sym = ik->constants()->symbol_at( 3842 extract_low_short_from_int( 3843 ik->constants()->name_and_type_at(encl_method_method_idx))); 3844 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3845 dest->obj_at_put(1, str()); 3846 sym = ik->constants()->symbol_at( 3847 extract_high_short_from_int( 3848 ik->constants()->name_and_type_at(encl_method_method_idx))); 3849 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3850 dest->obj_at_put(2, str()); 3851 } 3852 return (jobjectArray) JNIHandles::make_local(dest()); 3853 } 3854 JVM_END 3855 3856 // Returns an array of java.lang.String objects containing the input arguments to the VM. 3857 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3858 ResourceMark rm(THREAD); 3859 3860 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3861 return NULL; 3862 } 3863 3864 char** vm_flags = Arguments::jvm_flags_array(); 3865 char** vm_args = Arguments::jvm_args_array(); 3866 int num_flags = Arguments::num_jvm_flags(); 3867 int num_args = Arguments::num_jvm_args(); 3868 3869 InstanceKlass* ik = SystemDictionary::String_klass(); 3870 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL); 3871 objArrayHandle result_h(THREAD, r); 3872 3873 int index = 0; 3874 for (int j = 0; j < num_flags; j++, index++) { 3875 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3876 result_h->obj_at_put(index, h()); 3877 } 3878 for (int i = 0; i < num_args; i++, index++) { 3879 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3880 result_h->obj_at_put(index, h()); 3881 } 3882 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3883 JVM_END 3884 3885 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3886 return os::get_signal_number(name); 3887 JVM_END