1/* 2 * Copyright (c) 1997, 2017, 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 "classfile/classFileStream.hpp" 27#include "classfile/classLoader.hpp" 28#include "classfile/classLoaderData.inline.hpp" 29#include "classfile/javaAssertions.hpp" 30#include "classfile/javaClasses.inline.hpp" 31#include "classfile/moduleEntry.hpp" 32#include "classfile/modules.hpp" 33#include "classfile/packageEntry.hpp" 34#include "classfile/stringTable.hpp" 35#include "classfile/systemDictionary.hpp" 36#include "classfile/vmSymbols.hpp" 37#include "gc/shared/barrierSet.inline.hpp" 38#include "gc/shared/collectedHeap.inline.hpp" 39#include "interpreter/bytecode.hpp" 40#include "memory/oopFactory.hpp" 41#include "memory/resourceArea.hpp" 42#include "memory/universe.inline.hpp" 43#include "oops/fieldStreams.hpp" 44#include "oops/instanceKlass.hpp" 45#include "oops/method.hpp" 46#include "oops/objArrayKlass.hpp" 47#include "oops/objArrayOop.inline.hpp" 48#include "oops/oop.inline.hpp" 49#include "prims/jvm.h" 50#include "prims/jvm_misc.hpp" 51#include "prims/jvmtiExport.hpp" 52#include "prims/jvmtiThreadState.hpp" 53#include "prims/nativeLookup.hpp" 54#include "prims/privilegedStack.hpp" 55#include "prims/stackwalk.hpp" 56#include "runtime/arguments.hpp" 57#include "runtime/atomic.hpp" 58#include "runtime/handles.inline.hpp" 59#include "runtime/init.hpp" 60#include "runtime/interfaceSupport.hpp" 61#include "runtime/java.hpp" 62#include "runtime/javaCalls.hpp" 63#include "runtime/jfieldIDWorkaround.hpp" 64#include "runtime/orderAccess.inline.hpp" 65#include "runtime/os.inline.hpp" 66#include "runtime/perfData.hpp" 67#include "runtime/reflection.hpp" 68#include "runtime/thread.inline.hpp" 69#include "runtime/vframe.hpp" 70#include "runtime/vm_operations.hpp" 71#include "runtime/vm_version.hpp" 72#include "services/attachListener.hpp" 73#include "services/management.hpp" 74#include "services/threadService.hpp" 75#include "trace/tracing.hpp" 76#include "utilities/copy.hpp" 77#include "utilities/defaultStream.hpp" 78#include "utilities/dtrace.hpp" 79#include "utilities/events.hpp" 80#include "utilities/histogram.hpp" 81#include "utilities/macros.hpp" 82#include "utilities/utf8.hpp" 83#if INCLUDE_CDS 84#include "classfile/sharedClassUtil.hpp" 85#include "classfile/systemDictionaryShared.hpp" 86#endif 87 88#include <errno.h> 89 90/* 91 NOTE about use of any ctor or function call that can trigger a safepoint/GC: 92 such ctors and calls MUST NOT come between an oop declaration/init and its 93 usage because if objects are move this may cause various memory stomps, bus 94 errors and segfaults. Here is a cookbook for causing so called "naked oop 95 failures": 96 97 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> { 98 JVMWrapper("JVM_GetClassDeclaredFields"); 99 100 // Object address to be held directly in mirror & not visible to GC 101 oop mirror = JNIHandles::resolve_non_null(ofClass); 102 103 // If this ctor can hit a safepoint, moving objects around, then 104 ComplexConstructor foo; 105 106 // Boom! mirror may point to JUNK instead of the intended object 107 (some dereference of mirror) 108 109 // Here's another call that may block for GC, making mirror stale 110 MutexLocker ml(some_lock); 111 112 // And here's an initializer that can result in a stale oop 113 // all in one step. 114 oop o = call_that_can_throw_exception(TRAPS); 115 116 117 The solution is to keep the oop declaration BELOW the ctor or function 118 call that might cause a GC, do another resolve to reassign the oop, or 119 consider use of a Handle instead of an oop so there is immunity from object 120 motion. But note that the "QUICK" entries below do not have a handlemark 121 and thus can only support use of handles passed in. 122*/ 123 124static void trace_class_resolution_impl(Klass* to_class, TRAPS) { 125 ResourceMark rm; 126 int line_number = -1; 127 const char * source_file = NULL; 128 const char * trace = "explicit"; 129 InstanceKlass* caller = NULL; 130 JavaThread* jthread = JavaThread::current(); 131 if (jthread->has_last_Java_frame()) { 132 vframeStream vfst(jthread); 133 134 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames 135 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK); 136 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK); 137 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK); 138 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK); 139 140 Method* last_caller = NULL; 141 142 while (!vfst.at_end()) { 143 Method* m = vfst.method(); 144 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&& 145 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) && 146 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) { 147 break; 148 } 149 last_caller = m; 150 vfst.next(); 151 } 152 // if this is called from Class.forName0 and that is called from Class.forName, 153 // then print the caller of Class.forName. If this is Class.loadClass, then print 154 // that caller, otherwise keep quiet since this should be picked up elsewhere. 155 bool found_it = false; 156 if (!vfst.at_end() && 157 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 158 vfst.method()->name() == vmSymbols::forName0_name()) { 159 vfst.next(); 160 if (!vfst.at_end() && 161 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() && 162 vfst.method()->name() == vmSymbols::forName_name()) { 163 vfst.next(); 164 found_it = true; 165 } 166 } else if (last_caller != NULL && 167 last_caller->method_holder()->name() == 168 vmSymbols::java_lang_ClassLoader() && 169 (last_caller->name() == vmSymbols::loadClassInternal_name() || 170 last_caller->name() == vmSymbols::loadClass_name())) { 171 found_it = true; 172 } else if (!vfst.at_end()) { 173 if (vfst.method()->is_native()) { 174 // JNI call 175 found_it = true; 176 } 177 } 178 if (found_it && !vfst.at_end()) { 179 // found the caller 180 caller = vfst.method()->method_holder(); 181 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 182 if (line_number == -1) { 183 // show method name if it's a native method 184 trace = vfst.method()->name_and_sig_as_C_string(); 185 } 186 Symbol* s = caller->source_file_name(); 187 if (s != NULL) { 188 source_file = s->as_C_string(); 189 } 190 } 191 } 192 if (caller != NULL) { 193 if (to_class != caller) { 194 const char * from = caller->external_name(); 195 const char * to = to_class->external_name(); 196 // print in a single call to reduce interleaving between threads 197 if (source_file != NULL) { 198 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace); 199 } else { 200 log_debug(class, resolve)("%s %s (%s)", from, to, trace); 201 } 202 } 203 } 204} 205 206void trace_class_resolution(Klass* to_class) { 207 EXCEPTION_MARK; 208 trace_class_resolution_impl(to_class, THREAD); 209 if (HAS_PENDING_EXCEPTION) { 210 CLEAR_PENDING_EXCEPTION; 211 } 212} 213 214// Wrapper to trace JVM functions 215 216#ifdef ASSERT 217 Histogram* JVMHistogram; 218 volatile jint JVMHistogram_lock = 0; 219 220 class JVMHistogramElement : public HistogramElement { 221 public: 222 JVMHistogramElement(const char* name); 223 }; 224 225 JVMHistogramElement::JVMHistogramElement(const char* elementName) { 226 _name = elementName; 227 uintx count = 0; 228 229 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) { 230 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) { 231 count +=1; 232 if ( (WarnOnStalledSpinLock > 0) 233 && (count % WarnOnStalledSpinLock == 0)) { 234 warning("JVMHistogram_lock seems to be stalled"); 235 } 236 } 237 } 238 239 if(JVMHistogram == NULL) 240 JVMHistogram = new Histogram("JVM Call Counts",100); 241 242 JVMHistogram->add_element(this); 243 Atomic::dec(&JVMHistogram_lock); 244 } 245 246 #define JVMCountWrapper(arg) \ 247 static JVMHistogramElement* e = new JVMHistogramElement(arg); \ 248 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen! 249 250 #define JVMWrapper(arg) JVMCountWrapper(arg); 251#else 252 #define JVMWrapper(arg) 253#endif 254 255 256// Interface version ///////////////////////////////////////////////////////////////////// 257 258 259JVM_LEAF(jint, JVM_GetInterfaceVersion()) 260 return JVM_INTERFACE_VERSION; 261JVM_END 262 263 264// java.lang.System ////////////////////////////////////////////////////////////////////// 265 266 267JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored)) 268 JVMWrapper("JVM_CurrentTimeMillis"); 269 return os::javaTimeMillis(); 270JVM_END 271 272JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored)) 273 JVMWrapper("JVM_NanoTime"); 274 return os::javaTimeNanos(); 275JVM_END 276 277// The function below is actually exposed by jdk.internal.misc.VM and not 278// java.lang.System, but we choose to keep it here so that it stays next 279// to JVM_CurrentTimeMillis and JVM_NanoTime 280 281const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32 282const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32 283 284JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs)) 285 JVMWrapper("JVM_GetNanoTimeAdjustment"); 286 jlong seconds; 287 jlong nanos; 288 289 os::javaTimeSystemUTC(seconds, nanos); 290 291 // We're going to verify that the result can fit in a long. 292 // For that we need the difference in seconds between 'seconds' 293 // and 'offset_secs' to be such that: 294 // |seconds - offset_secs| < (2^63/10^9) 295 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3) 296 // which makes |seconds - offset_secs| < 2^33 297 // and we will prefer +/- 2^32 as the maximum acceptable diff 298 // as 2^32 has a more natural feel than 2^33... 299 // 300 // So if |seconds - offset_secs| >= 2^32 - we return a special 301 // sentinel value (-1) which the caller should take as an 302 // exception value indicating that the offset given to us is 303 // too far from range of the current time - leading to too big 304 // a nano adjustment. The caller is expected to recover by 305 // computing a more accurate offset and calling this method 306 // again. (For the record 2^32 secs is ~136 years, so that 307 // should rarely happen) 308 // 309 jlong diff = seconds - offset_secs; 310 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) { 311 return -1; // sentinel value: the offset is too far off the target 312 } 313 314 // return the adjustment. If you compute a time by adding 315 // this number of nanoseconds along with the number of seconds 316 // in the offset you should get the current UTC time. 317 return (diff * (jlong)1000000000) + nanos; 318JVM_END 319 320JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos, 321 jobject dst, jint dst_pos, jint length)) 322 JVMWrapper("JVM_ArrayCopy"); 323 // Check if we have null pointers 324 if (src == NULL || dst == NULL) { 325 THROW(vmSymbols::java_lang_NullPointerException()); 326 } 327 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); 328 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); 329 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop"); 330 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop"); 331 // Do copy 332 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread); 333JVM_END 334 335 336static void set_property(Handle props, const char* key, const char* value, TRAPS) { 337 JavaValue r(T_OBJECT); 338 // public synchronized Object put(Object key, Object value); 339 HandleMark hm(THREAD); 340 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK); 341 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK); 342 JavaCalls::call_virtual(&r, 343 props, 344 KlassHandle(THREAD, SystemDictionary::Properties_klass()), 345 vmSymbols::put_name(), 346 vmSymbols::object_object_object_signature(), 347 key_str, 348 value_str, 349 THREAD); 350} 351 352 353#define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties)); 354 355 356JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties)) 357 JVMWrapper("JVM_InitProperties"); 358 ResourceMark rm; 359 360 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 361 362 // System property list includes both user set via -D option and 363 // jvm system specific properties. 364 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 365 PUTPROP(props, p->key(), p->value()); 366 } 367 368 // Convert the -XX:MaxDirectMemorySize= command line flag 369 // to the sun.nio.MaxDirectMemorySize property. 370 // Do this after setting user properties to prevent people 371 // from setting the value with a -D option, as requested. 372 { 373 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) { 374 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1"); 375 } else { 376 char as_chars[256]; 377 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize); 378 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars); 379 } 380 } 381 382 // JVM monitoring and management support 383 // Add the sun.management.compiler property for the compiler's name 384 { 385#undef CSIZE 386#if defined(_LP64) || defined(_WIN64) 387 #define CSIZE "64-Bit " 388#else 389 #define CSIZE 390#endif // 64bit 391 392#ifdef TIERED 393 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers"; 394#else 395#if defined(COMPILER1) 396 const char* compiler_name = "HotSpot " CSIZE "Client Compiler"; 397#elif defined(COMPILER2) 398 const char* compiler_name = "HotSpot " CSIZE "Server Compiler"; 399#elif INCLUDE_JVMCI 400 #error "INCLUDE_JVMCI should imply TIERED" 401#else 402 const char* compiler_name = ""; 403#endif // compilers 404#endif // TIERED 405 406 if (*compiler_name != '\0' && 407 (Arguments::mode() != Arguments::_int)) { 408 PUTPROP(props, "sun.management.compiler", compiler_name); 409 } 410 } 411 412 return properties; 413JVM_END 414 415 416/* 417 * Return the temporary directory that the VM uses for the attach 418 * and perf data files. 419 * 420 * It is important that this directory is well-known and the 421 * same for all VM instances. It cannot be affected by configuration 422 * variables such as java.io.tmpdir. 423 */ 424JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env)) 425 JVMWrapper("JVM_GetTemporaryDirectory"); 426 HandleMark hm(THREAD); 427 const char* temp_dir = os::get_temp_directory(); 428 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL); 429 return (jstring) JNIHandles::make_local(env, h()); 430JVM_END 431 432 433// java.lang.Runtime ///////////////////////////////////////////////////////////////////////// 434 435extern volatile jint vm_created; 436 437JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code)) 438 before_exit(thread); 439 vm_exit(code); 440JVM_END 441 442 443JVM_ENTRY_NO_ENV(void, JVM_GC(void)) 444 JVMWrapper("JVM_GC"); 445 if (!DisableExplicitGC) { 446 Universe::heap()->collect(GCCause::_java_lang_system_gc); 447 } 448JVM_END 449 450 451JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void)) 452 JVMWrapper("JVM_MaxObjectInspectionAge"); 453 return Universe::heap()->millis_since_last_gc(); 454JVM_END 455 456 457static inline jlong convert_size_t_to_jlong(size_t val) { 458 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). 459 NOT_LP64 (return (jlong)val;) 460 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);) 461} 462 463JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void)) 464 JVMWrapper("JVM_TotalMemory"); 465 size_t n = Universe::heap()->capacity(); 466 return convert_size_t_to_jlong(n); 467JVM_END 468 469 470JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void)) 471 JVMWrapper("JVM_FreeMemory"); 472 CollectedHeap* ch = Universe::heap(); 473 size_t n; 474 { 475 MutexLocker x(Heap_lock); 476 n = ch->capacity() - ch->used(); 477 } 478 return convert_size_t_to_jlong(n); 479JVM_END 480 481 482JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void)) 483 JVMWrapper("JVM_MaxMemory"); 484 size_t n = Universe::heap()->max_capacity(); 485 return convert_size_t_to_jlong(n); 486JVM_END 487 488 489JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void)) 490 JVMWrapper("JVM_ActiveProcessorCount"); 491 return os::active_processor_count(); 492JVM_END 493 494 495 496// java.lang.Throwable ////////////////////////////////////////////////////// 497 498 499JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver)) 500 JVMWrapper("JVM_FillInStackTrace"); 501 Handle exception(thread, JNIHandles::resolve_non_null(receiver)); 502 java_lang_Throwable::fill_in_stack_trace(exception); 503JVM_END 504 505 506// java.lang.StackTraceElement ////////////////////////////////////////////// 507 508 509JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable)) 510 JVMWrapper("JVM_InitStackTraceElementArray"); 511 Handle exception(THREAD, JNIHandles::resolve(throwable)); 512 objArrayOop st = objArrayOop(JNIHandles::resolve(elements)); 513 objArrayHandle stack_trace(THREAD, st); 514 // Fill in the allocated stack trace 515 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK); 516JVM_END 517 518 519JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo)) 520 JVMWrapper("JVM_InitStackTraceElement"); 521 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo)); 522 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element)); 523 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD); 524JVM_END 525 526 527// java.lang.StackWalker ////////////////////////////////////////////////////// 528 529 530JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode, 531 jint skip_frames, jint frame_count, jint start_index, 532 jobjectArray frames)) 533 JVMWrapper("JVM_CallStackWalk"); 534 JavaThread* jt = (JavaThread*) THREAD; 535 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) { 536 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL); 537 } 538 539 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 540 541 // frames array is a Class<?>[] array when only getting caller reference, 542 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 543 // be null. 544 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 545 objArrayHandle frames_array_h(THREAD, fa); 546 547 int limit = start_index + frame_count; 548 if (frames_array_h->length() < limit) { 549 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL); 550 } 551 552 Handle result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count, 553 start_index, frames_array_h, CHECK_NULL); 554 return JNIHandles::make_local(env, result()); 555JVM_END 556 557 558JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor, 559 jint frame_count, jint start_index, 560 jobjectArray frames)) 561 JVMWrapper("JVM_MoreStackWalk"); 562 JavaThread* jt = (JavaThread*) THREAD; 563 564 // frames array is a Class<?>[] array when only getting caller reference, 565 // and a StackFrameInfo[] array (or derivative) otherwise. It should never 566 // be null. 567 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames)); 568 objArrayHandle frames_array_h(THREAD, fa); 569 570 int limit = start_index+frame_count; 571 if (frames_array_h->length() < limit) { 572 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers"); 573 } 574 575 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream)); 576 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count, 577 start_index, frames_array_h, THREAD); 578JVM_END 579 580// java.lang.Object /////////////////////////////////////////////// 581 582 583JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle)) 584 JVMWrapper("JVM_IHashCode"); 585 // as implemented in the classic virtual machine; return 0 if object is NULL 586 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ; 587JVM_END 588 589 590JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms)) 591 JVMWrapper("JVM_MonitorWait"); 592 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 593 JavaThreadInObjectWaitState jtiows(thread, ms != 0); 594 if (JvmtiExport::should_post_monitor_wait()) { 595 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms); 596 597 // The current thread already owns the monitor and it has not yet 598 // been added to the wait queue so the current thread cannot be 599 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT 600 // event handler cannot accidentally consume an unpark() meant for 601 // the ParkEvent associated with this ObjectMonitor. 602 } 603 ObjectSynchronizer::wait(obj, ms, CHECK); 604JVM_END 605 606 607JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle)) 608 JVMWrapper("JVM_MonitorNotify"); 609 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 610 ObjectSynchronizer::notify(obj, CHECK); 611JVM_END 612 613 614JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle)) 615 JVMWrapper("JVM_MonitorNotifyAll"); 616 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 617 ObjectSynchronizer::notifyall(obj, CHECK); 618JVM_END 619 620 621JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle)) 622 JVMWrapper("JVM_Clone"); 623 Handle obj(THREAD, JNIHandles::resolve_non_null(handle)); 624 const KlassHandle klass (THREAD, obj->klass()); 625 JvmtiVMObjectAllocEventCollector oam; 626 627#ifdef ASSERT 628 // Just checking that the cloneable flag is set correct 629 if (obj->is_array()) { 630 guarantee(klass->is_cloneable(), "all arrays are cloneable"); 631 } else { 632 guarantee(obj->is_instance(), "should be instanceOop"); 633 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass()); 634 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag"); 635 } 636#endif 637 638 // Check if class of obj supports the Cloneable interface. 639 // All arrays are considered to be cloneable (See JLS 20.1.5) 640 if (!klass->is_cloneable()) { 641 ResourceMark rm(THREAD); 642 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name()); 643 } 644 645 // Make shallow object copy 646 const int size = obj->size(); 647 oop new_obj_oop = NULL; 648 if (obj->is_array()) { 649 const int length = ((arrayOop)obj())->length(); 650 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL); 651 } else { 652 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL); 653 } 654 655 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread 656 // is modifying a reference field in the clonee, a non-oop-atomic copy might 657 // be suspended in the middle of copying the pointer and end up with parts 658 // of two different pointers in the field. Subsequent dereferences will crash. 659 // 4846409: an oop-copy of objects with long or double fields or arrays of same 660 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead 661 // of oops. We know objects are aligned on a minimum of an jlong boundary. 662 // The same is true of StubRoutines::object_copy and the various oop_copy 663 // variants, and of the code generated by the inline_native_clone intrinsic. 664 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned"); 665 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop, 666 (size_t)align_object_size(size) / HeapWordsPerLong); 667 // Clear the header 668 new_obj_oop->init_mark(); 669 670 // Store check (mark entire object and let gc sort it out) 671 BarrierSet* bs = Universe::heap()->barrier_set(); 672 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); 673 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size)); 674 675 Handle new_obj(THREAD, new_obj_oop); 676 // Special handling for MemberNames. Since they contain Method* metadata, they 677 // must be registered so that RedefineClasses can fix metadata contained in them. 678 if (java_lang_invoke_MemberName::is_instance(new_obj()) && 679 java_lang_invoke_MemberName::is_method(new_obj())) { 680 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj()); 681 // MemberName may be unresolved, so doesn't need registration until resolved. 682 if (method != NULL) { 683 methodHandle m(THREAD, method); 684 // This can safepoint and redefine method, so need both new_obj and method 685 // in a handle, for two different reasons. new_obj can move, method can be 686 // deleted if nothing is using it on the stack. 687 m->method_holder()->add_member_name(new_obj(), false); 688 } 689 } 690 691 // Caution: this involves a java upcall, so the clone should be 692 // "gc-robust" by this stage. 693 if (klass->has_finalizer()) { 694 assert(obj->is_instance(), "should be instanceOop"); 695 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL); 696 new_obj = Handle(THREAD, new_obj_oop); 697 } 698 699 return JNIHandles::make_local(env, new_obj()); 700JVM_END 701 702// java.io.File /////////////////////////////////////////////////////////////// 703 704JVM_LEAF(char*, JVM_NativePath(char* path)) 705 JVMWrapper("JVM_NativePath"); 706 return os::native_path(path); 707JVM_END 708 709 710// Misc. class handling /////////////////////////////////////////////////////////// 711 712 713JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth)) 714 JVMWrapper("JVM_GetCallerClass"); 715 716 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or 717 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided 718 // temporarily for existing code to use until a replacement API is defined. 719 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) { 720 Klass* k = thread->security_get_caller_class(depth); 721 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror()); 722 } 723 724 // Getting the class of the caller frame. 725 // 726 // The call stack at this point looks something like this: 727 // 728 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ] 729 // [1] [ @CallerSensitive API.method ] 730 // [.] [ (skipped intermediate frames) ] 731 // [n] [ caller ] 732 vframeStream vfst(thread); 733 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass 734 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) { 735 Method* m = vfst.method(); 736 assert(m != NULL, "sanity"); 737 switch (n) { 738 case 0: 739 // This must only be called from Reflection.getCallerClass 740 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) { 741 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass"); 742 } 743 // fall-through 744 case 1: 745 // Frame 0 and 1 must be caller sensitive. 746 if (!m->caller_sensitive()) { 747 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n)); 748 } 749 break; 750 default: 751 if (!m->is_ignored_by_security_stack_walk()) { 752 // We have reached the desired frame; return the holder class. 753 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror()); 754 } 755 break; 756 } 757 } 758 return NULL; 759JVM_END 760 761 762JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf)) 763 JVMWrapper("JVM_FindPrimitiveClass"); 764 oop mirror = NULL; 765 BasicType t = name2type(utf); 766 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) { 767 mirror = Universe::java_mirror(t); 768 } 769 if (mirror == NULL) { 770 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf); 771 } else { 772 return (jclass) JNIHandles::make_local(env, mirror); 773 } 774JVM_END 775 776 777// Returns a class loaded by the bootstrap class loader; or null 778// if not found. ClassNotFoundException is not thrown. 779// FindClassFromBootLoader is exported to the launcher for windows. 780JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env, 781 const char* name)) 782 JVMWrapper("JVM_FindClassFromBootLoader"); 783 784 // Java libraries should ensure that name is never null... 785 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 786 // It's impossible to create this class; the name cannot fit 787 // into the constant pool. 788 return NULL; 789 } 790 791 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 792 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL); 793 if (k == NULL) { 794 return NULL; 795 } 796 797 if (log_is_enabled(Debug, class, resolve)) { 798 trace_class_resolution(k); 799 } 800 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 801JVM_END 802 803// Find a class with this name in this loader, using the caller's protection domain. 804JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name, 805 jboolean init, jobject loader, 806 jclass caller)) 807 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException"); 808 // Java libraries should ensure that name is never null... 809 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 810 // It's impossible to create this class; the name cannot fit 811 // into the constant pool. 812 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name); 813 } 814 815 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 816 817 oop loader_oop = JNIHandles::resolve(loader); 818 oop from_class = JNIHandles::resolve(caller); 819 oop protection_domain = NULL; 820 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get 821 // NPE. Put it in another way, the bootstrap class loader has all permission and 822 // thus no checkPackageAccess equivalence in the VM class loader. 823 // The caller is also passed as NULL by the java code if there is no security 824 // manager to avoid the performance cost of getting the calling class. 825 if (from_class != NULL && loader_oop != NULL) { 826 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain(); 827 } 828 829 Handle h_loader(THREAD, loader_oop); 830 Handle h_prot(THREAD, protection_domain); 831 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 832 h_prot, false, THREAD); 833 834 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 835 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))); 836 } 837 return result; 838JVM_END 839 840JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name, 841 jboolean init, jclass from)) 842 JVMWrapper("JVM_FindClassFromClass"); 843 if (name == NULL || (int)strlen(name) > Symbol::max_length()) { 844 // It's impossible to create this class; the name cannot fit 845 // into the constant pool. 846 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 847 } 848 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL); 849 oop from_class_oop = JNIHandles::resolve(from); 850 Klass* from_class = (from_class_oop == NULL) 851 ? (Klass*)NULL 852 : java_lang_Class::as_Klass(from_class_oop); 853 oop class_loader = NULL; 854 oop protection_domain = NULL; 855 if (from_class != NULL) { 856 class_loader = from_class->class_loader(); 857 protection_domain = from_class->protection_domain(); 858 } 859 Handle h_loader(THREAD, class_loader); 860 Handle h_prot (THREAD, protection_domain); 861 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, 862 h_prot, true, thread); 863 864 if (log_is_enabled(Debug, class, resolve) && result != NULL) { 865 // this function is generally only used for class loading during verification. 866 ResourceMark rm; 867 oop from_mirror = JNIHandles::resolve_non_null(from); 868 Klass* from_class = java_lang_Class::as_Klass(from_mirror); 869 const char * from_name = from_class->external_name(); 870 871 oop mirror = JNIHandles::resolve_non_null(result); 872 Klass* to_class = java_lang_Class::as_Klass(mirror); 873 const char * to = to_class->external_name(); 874 log_debug(class, resolve)("%s %s (verification)", from_name, to); 875 } 876 877 return result; 878JVM_END 879 880static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) { 881 if (loader.is_null()) { 882 return; 883 } 884 885 // check whether the current caller thread holds the lock or not. 886 // If not, increment the corresponding counter 887 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) != 888 ObjectSynchronizer::owner_self) { 889 counter->inc(); 890 } 891} 892 893// common code for JVM_DefineClass() and JVM_DefineClassWithSource() 894static jclass jvm_define_class_common(JNIEnv *env, const char *name, 895 jobject loader, const jbyte *buf, 896 jsize len, jobject pd, const char *source, 897 TRAPS) { 898 if (source == NULL) source = "__JVM_DefineClass__"; 899 900 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 901 JavaThread* jt = (JavaThread*) THREAD; 902 903 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(), 904 ClassLoader::perf_define_appclass_selftime(), 905 ClassLoader::perf_define_appclasses(), 906 jt->get_thread_stat()->perf_recursion_counts_addr(), 907 jt->get_thread_stat()->perf_timers_addr(), 908 PerfClassTraceTime::DEFINE_CLASS); 909 910 if (UsePerfData) { 911 ClassLoader::perf_app_classfile_bytes_read()->inc(len); 912 } 913 914 // Since exceptions can be thrown, class initialization can take place 915 // if name is NULL no check for class name in .class stream has to be made. 916 TempNewSymbol class_name = NULL; 917 if (name != NULL) { 918 const int str_len = (int)strlen(name); 919 if (str_len > Symbol::max_length()) { 920 // It's impossible to create this class; the name cannot fit 921 // into the constant pool. 922 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 923 } 924 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL); 925 } 926 927 ResourceMark rm(THREAD); 928 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify); 929 Handle class_loader (THREAD, JNIHandles::resolve(loader)); 930 if (UsePerfData) { 931 is_lock_held_by_thread(class_loader, 932 ClassLoader::sync_JVMDefineClassLockFreeCounter(), 933 THREAD); 934 } 935 Handle protection_domain (THREAD, JNIHandles::resolve(pd)); 936 Klass* k = SystemDictionary::resolve_from_stream(class_name, 937 class_loader, 938 protection_domain, 939 &st, 940 CHECK_NULL); 941 942 if (log_is_enabled(Debug, class, resolve) && k != NULL) { 943 trace_class_resolution(k); 944 } 945 946 return (jclass) JNIHandles::make_local(env, k->java_mirror()); 947} 948 949 950JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd)) 951 JVMWrapper("JVM_DefineClass"); 952 953 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD); 954JVM_END 955 956 957JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source)) 958 JVMWrapper("JVM_DefineClassWithSource"); 959 960 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD); 961JVM_END 962 963JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name)) 964 JVMWrapper("JVM_FindLoadedClass"); 965 ResourceMark rm(THREAD); 966 967 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 968 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL); 969 970 const char* str = java_lang_String::as_utf8_string(string()); 971 // Sanity check, don't expect null 972 if (str == NULL) return NULL; 973 974 const int str_len = (int)strlen(str); 975 if (str_len > Symbol::max_length()) { 976 // It's impossible to create this class; the name cannot fit 977 // into the constant pool. 978 return NULL; 979 } 980 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL); 981 982 // Security Note: 983 // The Java level wrapper will perform the necessary security check allowing 984 // us to pass the NULL as the initiating class loader. 985 Handle h_loader(THREAD, JNIHandles::resolve(loader)); 986 if (UsePerfData) { 987 is_lock_held_by_thread(h_loader, 988 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(), 989 THREAD); 990 } 991 992 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name, 993 h_loader, 994 Handle(), 995 CHECK_NULL); 996#if INCLUDE_CDS 997 if (k == NULL) { 998 // If the class is not already loaded, try to see if it's in the shared 999 // archive for the current classloader (h_loader). 1000 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class( 1001 klass_name, h_loader, CHECK_NULL); 1002 k = ik(); 1003 } 1004#endif 1005 return (k == NULL) ? NULL : 1006 (jclass) JNIHandles::make_local(env, k->java_mirror()); 1007JVM_END 1008 1009// Module support ////////////////////////////////////////////////////////////////////////////// 1010 1011JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version, 1012 jstring location, const char* const* packages, jsize num_packages)) 1013 JVMWrapper("JVM_DefineModule"); 1014 Modules::define_module(module, version, location, packages, num_packages, CHECK); 1015JVM_END 1016 1017JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module)) 1018 JVMWrapper("JVM_SetBootLoaderUnnamedModule"); 1019 Modules::set_bootloader_unnamed_module(module, CHECK); 1020JVM_END 1021 1022JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module)) 1023 JVMWrapper("JVM_AddModuleExports"); 1024 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK); 1025JVM_END 1026 1027JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package)) 1028 JVMWrapper("JVM_AddModuleExportsToAllUnnamed"); 1029 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK); 1030JVM_END 1031 1032JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package)) 1033 JVMWrapper("JVM_AddModuleExportsToAll"); 1034 Modules::add_module_exports(from_module, package, NULL, CHECK); 1035JVM_END 1036 1037JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module)) 1038 JVMWrapper("JVM_AddReadsModule"); 1039 Modules::add_reads_module(from_module, source_module, CHECK); 1040JVM_END 1041 1042// Reflection support ////////////////////////////////////////////////////////////////////////////// 1043 1044JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls)) 1045 assert (cls != NULL, "illegal class"); 1046 JVMWrapper("JVM_GetClassName"); 1047 JvmtiVMObjectAllocEventCollector oam; 1048 ResourceMark rm(THREAD); 1049 const char* name; 1050 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1051 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls))); 1052 } else { 1053 // Consider caching interned string in Klass 1054 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1055 assert(k->is_klass(), "just checking"); 1056 name = k->external_name(); 1057 } 1058 oop result = StringTable::intern((char*) name, CHECK_NULL); 1059 return (jstring) JNIHandles::make_local(env, result); 1060JVM_END 1061 1062 1063JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls)) 1064 JVMWrapper("JVM_GetClassInterfaces"); 1065 JvmtiVMObjectAllocEventCollector oam; 1066 oop mirror = JNIHandles::resolve_non_null(cls); 1067 1068 // Special handling for primitive objects 1069 if (java_lang_Class::is_primitive(mirror)) { 1070 // Primitive objects does not have any interfaces 1071 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1072 return (jobjectArray) JNIHandles::make_local(env, r); 1073 } 1074 1075 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror)); 1076 // Figure size of result array 1077 int size; 1078 if (klass->is_instance_klass()) { 1079 size = InstanceKlass::cast(klass())->local_interfaces()->length(); 1080 } else { 1081 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass"); 1082 size = 2; 1083 } 1084 1085 // Allocate result array 1086 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL); 1087 objArrayHandle result (THREAD, r); 1088 // Fill in result 1089 if (klass->is_instance_klass()) { 1090 // Regular instance klass, fill in all local interfaces 1091 for (int index = 0; index < size; index++) { 1092 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index); 1093 result->obj_at_put(index, k->java_mirror()); 1094 } 1095 } else { 1096 // All arrays implement java.lang.Cloneable and java.io.Serializable 1097 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror()); 1098 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror()); 1099 } 1100 return (jobjectArray) JNIHandles::make_local(env, result()); 1101JVM_END 1102 1103 1104JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls)) 1105 JVMWrapper("JVM_IsInterface"); 1106 oop mirror = JNIHandles::resolve_non_null(cls); 1107 if (java_lang_Class::is_primitive(mirror)) { 1108 return JNI_FALSE; 1109 } 1110 Klass* k = java_lang_Class::as_Klass(mirror); 1111 jboolean result = k->is_interface(); 1112 assert(!result || k->is_instance_klass(), 1113 "all interfaces are instance types"); 1114 // The compiler intrinsic for isInterface tests the 1115 // Klass::_access_flags bits in the same way. 1116 return result; 1117JVM_END 1118 1119 1120JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls)) 1121 JVMWrapper("JVM_GetClassSigners"); 1122 JvmtiVMObjectAllocEventCollector oam; 1123 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1124 // There are no signers for primitive types 1125 return NULL; 1126 } 1127 1128 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls)); 1129 1130 // If there are no signers set in the class, or if the class 1131 // is an array, return NULL. 1132 if (signers == NULL) return NULL; 1133 1134 // copy of the signers array 1135 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass(); 1136 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL); 1137 for (int index = 0; index < signers->length(); index++) { 1138 signers_copy->obj_at_put(index, signers->obj_at(index)); 1139 } 1140 1141 // return the copy 1142 return (jobjectArray) JNIHandles::make_local(env, signers_copy); 1143JVM_END 1144 1145 1146JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers)) 1147 JVMWrapper("JVM_SetClassSigners"); 1148 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1149 // This call is ignored for primitive types and arrays. 1150 // Signers are only set once, ClassLoader.java, and thus shouldn't 1151 // be called with an array. Only the bootstrap loader creates arrays. 1152 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1153 if (k->is_instance_klass()) { 1154 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers))); 1155 } 1156 } 1157JVM_END 1158 1159 1160JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls)) 1161 JVMWrapper("JVM_GetProtectionDomain"); 1162 if (JNIHandles::resolve(cls) == NULL) { 1163 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 1164 } 1165 1166 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1167 // Primitive types does not have a protection domain. 1168 return NULL; 1169 } 1170 1171 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls)); 1172 return (jobject) JNIHandles::make_local(env, pd); 1173JVM_END 1174 1175 1176static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) { 1177 // If there is a security manager and protection domain, check the access 1178 // in the protection domain, otherwise it is authorized. 1179 if (java_lang_System::has_security_manager()) { 1180 1181 // For bootstrapping, if pd implies method isn't in the JDK, allow 1182 // this context to revert to older behavior. 1183 // In this case the isAuthorized field in AccessControlContext is also not 1184 // present. 1185 if (Universe::protection_domain_implies_method() == NULL) { 1186 return true; 1187 } 1188 1189 // Whitelist certain access control contexts 1190 if (java_security_AccessControlContext::is_authorized(context)) { 1191 return true; 1192 } 1193 1194 oop prot = klass->protection_domain(); 1195 if (prot != NULL) { 1196 // Call pd.implies(new SecurityPermission("createAccessControlContext")) 1197 // in the new wrapper. 1198 methodHandle m(THREAD, Universe::protection_domain_implies_method()); 1199 Handle h_prot(THREAD, prot); 1200 JavaValue result(T_BOOLEAN); 1201 JavaCallArguments args(h_prot); 1202 JavaCalls::call(&result, m, &args, CHECK_false); 1203 return (result.get_jboolean() != 0); 1204 } 1205 } 1206 return true; 1207} 1208 1209// Create an AccessControlContext with a protection domain with null codesource 1210// and null permissions - which gives no permissions. 1211oop create_dummy_access_control_context(TRAPS) { 1212 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass(); 1213 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL); 1214 // Call constructor ProtectionDomain(null, null); 1215 JavaValue result(T_VOID); 1216 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass), 1217 vmSymbols::object_initializer_name(), 1218 vmSymbols::codesource_permissioncollection_signature(), 1219 Handle(), Handle(), CHECK_NULL); 1220 1221 // new ProtectionDomain[] {pd}; 1222 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL); 1223 context->obj_at_put(0, obj()); 1224 1225 // new AccessControlContext(new ProtectionDomain[] {pd}) 1226 objArrayHandle h_context(THREAD, context); 1227 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL); 1228 return acc; 1229} 1230 1231JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException)) 1232 JVMWrapper("JVM_DoPrivileged"); 1233 1234 if (action == NULL) { 1235 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action"); 1236 } 1237 1238 // Compute the frame initiating the do privileged operation and setup the privileged stack 1239 vframeStream vfst(thread); 1240 vfst.security_get_caller_frame(1); 1241 1242 if (vfst.at_end()) { 1243 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?"); 1244 } 1245 1246 Method* method = vfst.method(); 1247 instanceKlassHandle klass (THREAD, method->method_holder()); 1248 1249 // Check that action object understands "Object run()" 1250 Handle h_context; 1251 if (context != NULL) { 1252 h_context = Handle(THREAD, JNIHandles::resolve(context)); 1253 bool authorized = is_authorized(h_context, klass, CHECK_NULL); 1254 if (!authorized) { 1255 // Create an unprivileged access control object and call it's run function 1256 // instead. 1257 oop noprivs = create_dummy_access_control_context(CHECK_NULL); 1258 h_context = Handle(THREAD, noprivs); 1259 } 1260 } 1261 1262 // Check that action object understands "Object run()" 1263 Handle object (THREAD, JNIHandles::resolve(action)); 1264 1265 // get run() method 1266 Method* m_oop = object->klass()->uncached_lookup_method( 1267 vmSymbols::run_method_name(), 1268 vmSymbols::void_object_signature(), 1269 Klass::find_overpass); 1270 methodHandle m (THREAD, m_oop); 1271 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) { 1272 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method"); 1273 } 1274 1275 // Stack allocated list of privileged stack elements 1276 PrivilegedElement pi; 1277 if (!vfst.at_end()) { 1278 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL); 1279 thread->set_privileged_stack_top(&pi); 1280 } 1281 1282 1283 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type 1284 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction 1285 Handle pending_exception; 1286 JavaValue result(T_OBJECT); 1287 JavaCallArguments args(object); 1288 JavaCalls::call(&result, m, &args, THREAD); 1289 1290 // done with action, remove ourselves from the list 1291 if (!vfst.at_end()) { 1292 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element"); 1293 thread->set_privileged_stack_top(thread->privileged_stack_top()->next()); 1294 } 1295 1296 if (HAS_PENDING_EXCEPTION) { 1297 pending_exception = Handle(THREAD, PENDING_EXCEPTION); 1298 CLEAR_PENDING_EXCEPTION; 1299 // JVMTI has already reported the pending exception 1300 // JVMTI internal flag reset is needed in order to report PrivilegedActionException 1301 if (THREAD->is_Java_thread()) { 1302 JvmtiExport::clear_detected_exception((JavaThread*) THREAD); 1303 } 1304 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) && 1305 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) { 1306 // Throw a java.security.PrivilegedActionException(Exception e) exception 1307 JavaCallArguments args(pending_exception); 1308 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(), 1309 vmSymbols::exception_void_signature(), 1310 &args); 1311 } 1312 } 1313 1314 if (pending_exception.not_null()) THROW_OOP_0(pending_exception()); 1315 return JNIHandles::make_local(env, (oop) result.get_jobject()); 1316JVM_END 1317 1318 1319// Returns the inherited_access_control_context field of the running thread. 1320JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls)) 1321 JVMWrapper("JVM_GetInheritedAccessControlContext"); 1322 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj()); 1323 return JNIHandles::make_local(env, result); 1324JVM_END 1325 1326class RegisterArrayForGC { 1327 private: 1328 JavaThread *_thread; 1329 public: 1330 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) { 1331 _thread = thread; 1332 _thread->register_array_for_gc(array); 1333 } 1334 1335 ~RegisterArrayForGC() { 1336 _thread->register_array_for_gc(NULL); 1337 } 1338}; 1339 1340 1341JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls)) 1342 JVMWrapper("JVM_GetStackAccessControlContext"); 1343 if (!UsePrivilegedStack) return NULL; 1344 1345 ResourceMark rm(THREAD); 1346 GrowableArray<oop>* local_array = new GrowableArray<oop>(12); 1347 JvmtiVMObjectAllocEventCollector oam; 1348 1349 // count the protection domains on the execution stack. We collapse 1350 // duplicate consecutive protection domains into a single one, as 1351 // well as stopping when we hit a privileged frame. 1352 1353 // Use vframeStream to iterate through Java frames 1354 vframeStream vfst(thread); 1355 1356 oop previous_protection_domain = NULL; 1357 Handle privileged_context(thread, NULL); 1358 bool is_privileged = false; 1359 oop protection_domain = NULL; 1360 1361 for(; !vfst.at_end(); vfst.next()) { 1362 // get method of frame 1363 Method* method = vfst.method(); 1364 intptr_t* frame_id = vfst.frame_id(); 1365 1366 // check the privileged frames to see if we have a match 1367 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) { 1368 // this frame is privileged 1369 is_privileged = true; 1370 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context()); 1371 protection_domain = thread->privileged_stack_top()->protection_domain(); 1372 } else { 1373 protection_domain = method->method_holder()->protection_domain(); 1374 } 1375 1376 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) { 1377 local_array->push(protection_domain); 1378 previous_protection_domain = protection_domain; 1379 } 1380 1381 if (is_privileged) break; 1382 } 1383 1384 1385 // either all the domains on the stack were system domains, or 1386 // we had a privileged system domain 1387 if (local_array->is_empty()) { 1388 if (is_privileged && privileged_context.is_null()) return NULL; 1389 1390 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL); 1391 return JNIHandles::make_local(env, result); 1392 } 1393 1394 // the resource area must be registered in case of a gc 1395 RegisterArrayForGC ragc(thread, local_array); 1396 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(), 1397 local_array->length(), CHECK_NULL); 1398 objArrayHandle h_context(thread, context); 1399 for (int index = 0; index < local_array->length(); index++) { 1400 h_context->obj_at_put(index, local_array->at(index)); 1401 } 1402 1403 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL); 1404 1405 return JNIHandles::make_local(env, result); 1406JVM_END 1407 1408 1409JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls)) 1410 JVMWrapper("JVM_IsArrayClass"); 1411 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1412 return (k != NULL) && k->is_array_klass() ? true : false; 1413JVM_END 1414 1415 1416JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls)) 1417 JVMWrapper("JVM_IsPrimitiveClass"); 1418 oop mirror = JNIHandles::resolve_non_null(cls); 1419 return (jboolean) java_lang_Class::is_primitive(mirror); 1420JVM_END 1421 1422 1423JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls)) 1424 JVMWrapper("JVM_GetClassModifiers"); 1425 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1426 // Primitive type 1427 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1428 } 1429 1430 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1431 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0)); 1432 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK"); 1433 return k->modifier_flags(); 1434JVM_END 1435 1436 1437// Inner class reflection /////////////////////////////////////////////////////////////////////////////// 1438 1439JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass)) 1440 JvmtiVMObjectAllocEventCollector oam; 1441 // ofClass is a reference to a java_lang_Class object. The mirror object 1442 // of an InstanceKlass 1443 1444 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1445 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1446 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1447 return (jobjectArray)JNIHandles::make_local(env, result); 1448 } 1449 1450 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1451 InnerClassesIterator iter(k); 1452 1453 if (iter.length() == 0) { 1454 // Neither an inner nor outer class 1455 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL); 1456 return (jobjectArray)JNIHandles::make_local(env, result); 1457 } 1458 1459 // find inner class info 1460 constantPoolHandle cp(thread, k->constants()); 1461 int length = iter.length(); 1462 1463 // Allocate temp. result array 1464 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL); 1465 objArrayHandle result (THREAD, r); 1466 int members = 0; 1467 1468 for (; !iter.done(); iter.next()) { 1469 int ioff = iter.inner_class_info_index(); 1470 int ooff = iter.outer_class_info_index(); 1471 1472 if (ioff != 0 && ooff != 0) { 1473 // Check to see if the name matches the class we're looking for 1474 // before attempting to find the class. 1475 if (cp->klass_name_at_matches(k, ooff)) { 1476 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL); 1477 if (outer_klass == k()) { 1478 Klass* ik = cp->klass_at(ioff, CHECK_NULL); 1479 instanceKlassHandle inner_klass (THREAD, ik); 1480 1481 // Throws an exception if outer klass has not declared k as 1482 // an inner klass 1483 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL); 1484 1485 result->obj_at_put(members, inner_klass->java_mirror()); 1486 members++; 1487 } 1488 } 1489 } 1490 } 1491 1492 if (members != length) { 1493 // Return array of right length 1494 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL); 1495 for(int i = 0; i < members; i++) { 1496 res->obj_at_put(i, result->obj_at(i)); 1497 } 1498 return (jobjectArray)JNIHandles::make_local(env, res); 1499 } 1500 1501 return (jobjectArray)JNIHandles::make_local(env, result()); 1502JVM_END 1503 1504 1505JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass)) 1506{ 1507 // ofClass is a reference to a java_lang_Class object. 1508 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1509 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) { 1510 return NULL; 1511 } 1512 1513 bool inner_is_member = false; 1514 Klass* outer_klass 1515 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)) 1516 )->compute_enclosing_class(&inner_is_member, CHECK_NULL); 1517 if (outer_klass == NULL) return NULL; // already a top-level class 1518 if (!inner_is_member) return NULL; // an anonymous class (inside a method) 1519 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror()); 1520} 1521JVM_END 1522 1523JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls)) 1524{ 1525 oop mirror = JNIHandles::resolve_non_null(cls); 1526 if (java_lang_Class::is_primitive(mirror) || 1527 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) { 1528 return NULL; 1529 } 1530 instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror))); 1531 int ooff = 0, noff = 0; 1532 if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) { 1533 if (noff != 0) { 1534 constantPoolHandle i_cp(thread, k->constants()); 1535 Symbol* name = i_cp->symbol_at(noff); 1536 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL); 1537 return (jstring) JNIHandles::make_local(env, str()); 1538 } 1539 } 1540 return NULL; 1541} 1542JVM_END 1543 1544JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls)) 1545 assert (cls != NULL, "illegal class"); 1546 JVMWrapper("JVM_GetClassSignature"); 1547 JvmtiVMObjectAllocEventCollector oam; 1548 ResourceMark rm(THREAD); 1549 // Return null for arrays and primatives 1550 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1551 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1552 if (k->is_instance_klass()) { 1553 Symbol* sym = InstanceKlass::cast(k)->generic_signature(); 1554 if (sym == NULL) return NULL; 1555 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 1556 return (jstring) JNIHandles::make_local(env, str()); 1557 } 1558 } 1559 return NULL; 1560JVM_END 1561 1562 1563JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls)) 1564 assert (cls != NULL, "illegal class"); 1565 JVMWrapper("JVM_GetClassAnnotations"); 1566 1567 // Return null for arrays and primitives 1568 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1569 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1570 if (k->is_instance_klass()) { 1571 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL); 1572 return (jbyteArray) JNIHandles::make_local(env, a); 1573 } 1574 } 1575 return NULL; 1576JVM_END 1577 1578 1579static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) { 1580 // some of this code was adapted from from jni_FromReflectedField 1581 1582 oop reflected = JNIHandles::resolve_non_null(field); 1583 oop mirror = java_lang_reflect_Field::clazz(reflected); 1584 Klass* k = java_lang_Class::as_Klass(mirror); 1585 int slot = java_lang_reflect_Field::slot(reflected); 1586 int modifiers = java_lang_reflect_Field::modifiers(reflected); 1587 1588 KlassHandle kh(THREAD, k); 1589 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot); 1590 1591 if (modifiers & JVM_ACC_STATIC) { 1592 // for static fields we only look in the current class 1593 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) { 1594 assert(false, "cannot find static field"); 1595 return false; 1596 } 1597 } else { 1598 // for instance fields we start with the current class and work 1599 // our way up through the superclass chain 1600 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) { 1601 assert(false, "cannot find instance field"); 1602 return false; 1603 } 1604 } 1605 return true; 1606} 1607 1608static Method* jvm_get_method_common(jobject method) { 1609 // some of this code was adapted from from jni_FromReflectedMethod 1610 1611 oop reflected = JNIHandles::resolve_non_null(method); 1612 oop mirror = NULL; 1613 int slot = 0; 1614 1615 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) { 1616 mirror = java_lang_reflect_Constructor::clazz(reflected); 1617 slot = java_lang_reflect_Constructor::slot(reflected); 1618 } else { 1619 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), 1620 "wrong type"); 1621 mirror = java_lang_reflect_Method::clazz(reflected); 1622 slot = java_lang_reflect_Method::slot(reflected); 1623 } 1624 Klass* k = java_lang_Class::as_Klass(mirror); 1625 1626 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 1627 assert(m != NULL, "cannot find method"); 1628 return m; // caller has to deal with NULL in product mode 1629} 1630 1631/* Type use annotations support (JDK 1.8) */ 1632 1633JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls)) 1634 assert (cls != NULL, "illegal class"); 1635 JVMWrapper("JVM_GetClassTypeAnnotations"); 1636 ResourceMark rm(THREAD); 1637 // Return null for arrays and primitives 1638 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) { 1639 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls)); 1640 if (k->is_instance_klass()) { 1641 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations(); 1642 if (type_annotations != NULL) { 1643 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1644 return (jbyteArray) JNIHandles::make_local(env, a); 1645 } 1646 } 1647 } 1648 return NULL; 1649JVM_END 1650 1651JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method)) 1652 assert (method != NULL, "illegal method"); 1653 JVMWrapper("JVM_GetMethodTypeAnnotations"); 1654 1655 // method is a handle to a java.lang.reflect.Method object 1656 Method* m = jvm_get_method_common(method); 1657 if (m == NULL) { 1658 return NULL; 1659 } 1660 1661 AnnotationArray* type_annotations = m->type_annotations(); 1662 if (type_annotations != NULL) { 1663 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL); 1664 return (jbyteArray) JNIHandles::make_local(env, a); 1665 } 1666 1667 return NULL; 1668JVM_END 1669 1670JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field)) 1671 assert (field != NULL, "illegal field"); 1672 JVMWrapper("JVM_GetFieldTypeAnnotations"); 1673 1674 fieldDescriptor fd; 1675 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL); 1676 if (!gotFd) { 1677 return NULL; 1678 } 1679 1680 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD)); 1681JVM_END 1682 1683static void bounds_check(constantPoolHandle cp, jint index, TRAPS) { 1684 if (!cp->is_within_bounds(index)) { 1685 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds"); 1686 } 1687} 1688 1689JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method)) 1690{ 1691 JVMWrapper("JVM_GetMethodParameters"); 1692 // method is a handle to a java.lang.reflect.Method object 1693 Method* method_ptr = jvm_get_method_common(method); 1694 methodHandle mh (THREAD, method_ptr); 1695 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method)); 1696 const int num_params = mh->method_parameters_length(); 1697 1698 if (num_params < 0) { 1699 // A -1 return value from method_parameters_length means there is no 1700 // parameter data. Return null to indicate this to the reflection 1701 // API. 1702 assert(num_params == -1, "num_params should be -1 if it is less than zero"); 1703 return (jobjectArray)NULL; 1704 } else { 1705 // Otherwise, we return something up to reflection, even if it is 1706 // a zero-length array. Why? Because in some cases this can 1707 // trigger a MalformedParametersException. 1708 1709 // make sure all the symbols are properly formatted 1710 for (int i = 0; i < num_params; i++) { 1711 MethodParametersElement* params = mh->method_parameters_start(); 1712 int index = params[i].name_cp_index; 1713 bounds_check(mh->constants(), index, CHECK_NULL); 1714 1715 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) { 1716 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), 1717 "Wrong type at constant pool index"); 1718 } 1719 1720 } 1721 1722 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL); 1723 objArrayHandle result (THREAD, result_oop); 1724 1725 for (int i = 0; i < num_params; i++) { 1726 MethodParametersElement* params = mh->method_parameters_start(); 1727 // For a 0 index, give a NULL symbol 1728 Symbol* sym = 0 != params[i].name_cp_index ? 1729 mh->constants()->symbol_at(params[i].name_cp_index) : NULL; 1730 int flags = params[i].flags; 1731 oop param = Reflection::new_parameter(reflected_method, i, sym, 1732 flags, CHECK_NULL); 1733 result->obj_at_put(i, param); 1734 } 1735 return (jobjectArray)JNIHandles::make_local(env, result()); 1736 } 1737} 1738JVM_END 1739 1740// New (JDK 1.4) reflection implementation ///////////////////////////////////// 1741 1742JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1743{ 1744 JVMWrapper("JVM_GetClassDeclaredFields"); 1745 JvmtiVMObjectAllocEventCollector oam; 1746 1747 // Exclude primitive types and array types 1748 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) || 1749 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1750 // Return empty array 1751 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL); 1752 return (jobjectArray) JNIHandles::make_local(env, res); 1753 } 1754 1755 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1756 constantPoolHandle cp(THREAD, k->constants()); 1757 1758 // Ensure class is linked 1759 k->link_class(CHECK_NULL); 1760 1761 // Allocate result 1762 int num_fields; 1763 1764 if (publicOnly) { 1765 num_fields = 0; 1766 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) { 1767 if (fs.access_flags().is_public()) ++num_fields; 1768 } 1769 } else { 1770 num_fields = k->java_fields_count(); 1771 } 1772 1773 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL); 1774 objArrayHandle result (THREAD, r); 1775 1776 int out_idx = 0; 1777 fieldDescriptor fd; 1778 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 1779 if (!publicOnly || fs.access_flags().is_public()) { 1780 fd.reinitialize(k(), fs.index()); 1781 oop field = Reflection::new_field(&fd, CHECK_NULL); 1782 result->obj_at_put(out_idx, field); 1783 ++out_idx; 1784 } 1785 } 1786 assert(out_idx == num_fields, "just checking"); 1787 return (jobjectArray) JNIHandles::make_local(env, result()); 1788} 1789JVM_END 1790 1791static bool select_method(methodHandle method, bool want_constructor) { 1792 if (want_constructor) { 1793 return (method->is_initializer() && !method->is_static()); 1794 } else { 1795 return (!method->is_initializer() && !method->is_overpass()); 1796 } 1797} 1798 1799static jobjectArray get_class_declared_methods_helper( 1800 JNIEnv *env, 1801 jclass ofClass, jboolean publicOnly, 1802 bool want_constructor, 1803 Klass* klass, TRAPS) { 1804 1805 JvmtiVMObjectAllocEventCollector oam; 1806 1807 // Exclude primitive types and array types 1808 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) 1809 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) { 1810 // Return empty array 1811 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL); 1812 return (jobjectArray) JNIHandles::make_local(env, res); 1813 } 1814 1815 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))); 1816 1817 // Ensure class is linked 1818 k->link_class(CHECK_NULL); 1819 1820 Array<Method*>* methods = k->methods(); 1821 int methods_length = methods->length(); 1822 1823 // Save original method_idnum in case of redefinition, which can change 1824 // the idnum of obsolete methods. The new method will have the same idnum 1825 // but if we refresh the methods array, the counts will be wrong. 1826 ResourceMark rm(THREAD); 1827 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length); 1828 int num_methods = 0; 1829 1830 for (int i = 0; i < methods_length; i++) { 1831 methodHandle method(THREAD, methods->at(i)); 1832 if (select_method(method, want_constructor)) { 1833 if (!publicOnly || method->is_public()) { 1834 idnums->push(method->method_idnum()); 1835 ++num_methods; 1836 } 1837 } 1838 } 1839 1840 // Allocate result 1841 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL); 1842 objArrayHandle result (THREAD, r); 1843 1844 // Now just put the methods that we selected above, but go by their idnum 1845 // in case of redefinition. The methods can be redefined at any safepoint, 1846 // so above when allocating the oop array and below when creating reflect 1847 // objects. 1848 for (int i = 0; i < num_methods; i++) { 1849 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i))); 1850 if (method.is_null()) { 1851 // Method may have been deleted and seems this API can handle null 1852 // Otherwise should probably put a method that throws NSME 1853 result->obj_at_put(i, NULL); 1854 } else { 1855 oop m; 1856 if (want_constructor) { 1857 m = Reflection::new_constructor(method, CHECK_NULL); 1858 } else { 1859 m = Reflection::new_method(method, false, CHECK_NULL); 1860 } 1861 result->obj_at_put(i, m); 1862 } 1863 } 1864 1865 return (jobjectArray) JNIHandles::make_local(env, result()); 1866} 1867 1868JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1869{ 1870 JVMWrapper("JVM_GetClassDeclaredMethods"); 1871 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1872 /*want_constructor*/ false, 1873 SystemDictionary::reflect_Method_klass(), THREAD); 1874} 1875JVM_END 1876 1877JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly)) 1878{ 1879 JVMWrapper("JVM_GetClassDeclaredConstructors"); 1880 return get_class_declared_methods_helper(env, ofClass, publicOnly, 1881 /*want_constructor*/ true, 1882 SystemDictionary::reflect_Constructor_klass(), THREAD); 1883} 1884JVM_END 1885 1886JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls)) 1887{ 1888 JVMWrapper("JVM_GetClassAccessFlags"); 1889 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1890 // Primitive type 1891 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 1892 } 1893 1894 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1895 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS; 1896} 1897JVM_END 1898 1899 1900// Constant pool access ////////////////////////////////////////////////////////// 1901 1902JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls)) 1903{ 1904 JVMWrapper("JVM_GetClassConstantPool"); 1905 JvmtiVMObjectAllocEventCollector oam; 1906 1907 // Return null for primitives and arrays 1908 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 1909 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 1910 if (k->is_instance_klass()) { 1911 instanceKlassHandle k_h(THREAD, k); 1912 Handle jcp = reflect_ConstantPool::create(CHECK_NULL); 1913 reflect_ConstantPool::set_cp(jcp(), k_h->constants()); 1914 return JNIHandles::make_local(jcp()); 1915 } 1916 } 1917 return NULL; 1918} 1919JVM_END 1920 1921 1922JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused)) 1923{ 1924 JVMWrapper("JVM_ConstantPoolGetSize"); 1925 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1926 return cp->length(); 1927} 1928JVM_END 1929 1930 1931JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1932{ 1933 JVMWrapper("JVM_ConstantPoolGetClassAt"); 1934 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1935 bounds_check(cp, index, CHECK_NULL); 1936 constantTag tag = cp->tag_at(index); 1937 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1938 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1939 } 1940 Klass* k = cp->klass_at(index, CHECK_NULL); 1941 return (jclass) JNIHandles::make_local(k->java_mirror()); 1942} 1943JVM_END 1944 1945JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 1946{ 1947 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded"); 1948 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1949 bounds_check(cp, index, CHECK_NULL); 1950 constantTag tag = cp->tag_at(index); 1951 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1952 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1953 } 1954 Klass* k = ConstantPool::klass_at_if_loaded(cp, index); 1955 if (k == NULL) return NULL; 1956 return (jclass) JNIHandles::make_local(k->java_mirror()); 1957} 1958JVM_END 1959 1960static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 1961 constantTag tag = cp->tag_at(index); 1962 if (!tag.is_method() && !tag.is_interface_method()) { 1963 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 1964 } 1965 int klass_ref = cp->uncached_klass_ref_index_at(index); 1966 Klass* k_o; 1967 if (force_resolution) { 1968 k_o = cp->klass_at(klass_ref, CHECK_NULL); 1969 } else { 1970 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 1971 if (k_o == NULL) return NULL; 1972 } 1973 instanceKlassHandle k(THREAD, k_o); 1974 Symbol* name = cp->uncached_name_ref_at(index); 1975 Symbol* sig = cp->uncached_signature_ref_at(index); 1976 methodHandle m (THREAD, k->find_method(name, sig)); 1977 if (m.is_null()) { 1978 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class"); 1979 } 1980 oop method; 1981 if (!m->is_initializer() || m->is_static()) { 1982 method = Reflection::new_method(m, true, CHECK_NULL); 1983 } else { 1984 method = Reflection::new_constructor(m, CHECK_NULL); 1985 } 1986 return JNIHandles::make_local(method); 1987} 1988 1989JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 1990{ 1991 JVMWrapper("JVM_ConstantPoolGetMethodAt"); 1992 JvmtiVMObjectAllocEventCollector oam; 1993 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 1994 bounds_check(cp, index, CHECK_NULL); 1995 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL); 1996 return res; 1997} 1998JVM_END 1999 2000JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2001{ 2002 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded"); 2003 JvmtiVMObjectAllocEventCollector oam; 2004 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2005 bounds_check(cp, index, CHECK_NULL); 2006 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL); 2007 return res; 2008} 2009JVM_END 2010 2011static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) { 2012 constantTag tag = cp->tag_at(index); 2013 if (!tag.is_field()) { 2014 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2015 } 2016 int klass_ref = cp->uncached_klass_ref_index_at(index); 2017 Klass* k_o; 2018 if (force_resolution) { 2019 k_o = cp->klass_at(klass_ref, CHECK_NULL); 2020 } else { 2021 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref); 2022 if (k_o == NULL) return NULL; 2023 } 2024 instanceKlassHandle k(THREAD, k_o); 2025 Symbol* name = cp->uncached_name_ref_at(index); 2026 Symbol* sig = cp->uncached_signature_ref_at(index); 2027 fieldDescriptor fd; 2028 Klass* target_klass = k->find_field(name, sig, &fd); 2029 if (target_klass == NULL) { 2030 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class"); 2031 } 2032 oop field = Reflection::new_field(&fd, CHECK_NULL); 2033 return JNIHandles::make_local(field); 2034} 2035 2036JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index)) 2037{ 2038 JVMWrapper("JVM_ConstantPoolGetFieldAt"); 2039 JvmtiVMObjectAllocEventCollector oam; 2040 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2041 bounds_check(cp, index, CHECK_NULL); 2042 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL); 2043 return res; 2044} 2045JVM_END 2046 2047JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index)) 2048{ 2049 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded"); 2050 JvmtiVMObjectAllocEventCollector oam; 2051 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2052 bounds_check(cp, index, CHECK_NULL); 2053 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL); 2054 return res; 2055} 2056JVM_END 2057 2058JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2059{ 2060 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt"); 2061 JvmtiVMObjectAllocEventCollector oam; 2062 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2063 bounds_check(cp, index, CHECK_NULL); 2064 constantTag tag = cp->tag_at(index); 2065 if (!tag.is_field_or_method()) { 2066 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2067 } 2068 int klass_ref = cp->uncached_klass_ref_index_at(index); 2069 Symbol* klass_name = cp->klass_name_at(klass_ref); 2070 Symbol* member_name = cp->uncached_name_ref_at(index); 2071 Symbol* member_sig = cp->uncached_signature_ref_at(index); 2072 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL); 2073 objArrayHandle dest(THREAD, dest_o); 2074 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL); 2075 dest->obj_at_put(0, str()); 2076 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2077 dest->obj_at_put(1, str()); 2078 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2079 dest->obj_at_put(2, str()); 2080 return (jobjectArray) JNIHandles::make_local(dest()); 2081} 2082JVM_END 2083 2084JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2085{ 2086 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt"); 2087 JvmtiVMObjectAllocEventCollector oam; 2088 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2089 bounds_check(cp, index, CHECK_0); 2090 constantTag tag = cp->tag_at(index); 2091 if (!tag.is_field_or_method()) { 2092 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2093 } 2094 return (jint) cp->uncached_klass_ref_index_at(index); 2095} 2096JVM_END 2097 2098JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2099{ 2100 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt"); 2101 JvmtiVMObjectAllocEventCollector oam; 2102 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2103 bounds_check(cp, index, CHECK_0); 2104 constantTag tag = cp->tag_at(index); 2105 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) { 2106 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2107 } 2108 return (jint) cp->uncached_name_and_type_ref_index_at(index); 2109} 2110JVM_END 2111 2112JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2113{ 2114 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt"); 2115 JvmtiVMObjectAllocEventCollector oam; 2116 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2117 bounds_check(cp, index, CHECK_NULL); 2118 constantTag tag = cp->tag_at(index); 2119 if (!tag.is_name_and_type()) { 2120 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2121 } 2122 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index)); 2123 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index)); 2124 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL); 2125 objArrayHandle dest(THREAD, dest_o); 2126 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL); 2127 dest->obj_at_put(0, str()); 2128 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL); 2129 dest->obj_at_put(1, str()); 2130 return (jobjectArray) JNIHandles::make_local(dest()); 2131} 2132JVM_END 2133 2134JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2135{ 2136 JVMWrapper("JVM_ConstantPoolGetIntAt"); 2137 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2138 bounds_check(cp, index, CHECK_0); 2139 constantTag tag = cp->tag_at(index); 2140 if (!tag.is_int()) { 2141 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2142 } 2143 return cp->int_at(index); 2144} 2145JVM_END 2146 2147JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2148{ 2149 JVMWrapper("JVM_ConstantPoolGetLongAt"); 2150 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2151 bounds_check(cp, index, CHECK_(0L)); 2152 constantTag tag = cp->tag_at(index); 2153 if (!tag.is_long()) { 2154 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2155 } 2156 return cp->long_at(index); 2157} 2158JVM_END 2159 2160JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2161{ 2162 JVMWrapper("JVM_ConstantPoolGetFloatAt"); 2163 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2164 bounds_check(cp, index, CHECK_(0.0f)); 2165 constantTag tag = cp->tag_at(index); 2166 if (!tag.is_float()) { 2167 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2168 } 2169 return cp->float_at(index); 2170} 2171JVM_END 2172 2173JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2174{ 2175 JVMWrapper("JVM_ConstantPoolGetDoubleAt"); 2176 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2177 bounds_check(cp, index, CHECK_(0.0)); 2178 constantTag tag = cp->tag_at(index); 2179 if (!tag.is_double()) { 2180 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2181 } 2182 return cp->double_at(index); 2183} 2184JVM_END 2185 2186JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2187{ 2188 JVMWrapper("JVM_ConstantPoolGetStringAt"); 2189 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2190 bounds_check(cp, index, CHECK_NULL); 2191 constantTag tag = cp->tag_at(index); 2192 if (!tag.is_string()) { 2193 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2194 } 2195 oop str = cp->string_at(index, CHECK_NULL); 2196 return (jstring) JNIHandles::make_local(str); 2197} 2198JVM_END 2199 2200JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index)) 2201{ 2202 JVMWrapper("JVM_ConstantPoolGetUTF8At"); 2203 JvmtiVMObjectAllocEventCollector oam; 2204 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2205 bounds_check(cp, index, CHECK_NULL); 2206 constantTag tag = cp->tag_at(index); 2207 if (!tag.is_symbol()) { 2208 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index"); 2209 } 2210 Symbol* sym = cp->symbol_at(index); 2211 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 2212 return (jstring) JNIHandles::make_local(str()); 2213} 2214JVM_END 2215 2216JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index)) 2217{ 2218 JVMWrapper("JVM_ConstantPoolGetTagAt"); 2219 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj))); 2220 bounds_check(cp, index, CHECK_0); 2221 constantTag tag = cp->tag_at(index); 2222 jbyte result = tag.value(); 2223 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105, 2224 // they are changed to the corresponding tags from the JVM spec, so that java code in 2225 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones. 2226 if (tag.is_klass_or_reference()) { 2227 result = JVM_CONSTANT_Class; 2228 } else if (tag.is_string_index()) { 2229 result = JVM_CONSTANT_String; 2230 } else if (tag.is_method_type_in_error()) { 2231 result = JVM_CONSTANT_MethodType; 2232 } else if (tag.is_method_handle_in_error()) { 2233 result = JVM_CONSTANT_MethodHandle; 2234 } 2235 return result; 2236} 2237JVM_END 2238 2239// Assertion support. ////////////////////////////////////////////////////////// 2240 2241JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls)) 2242 JVMWrapper("JVM_DesiredAssertionStatus"); 2243 assert(cls != NULL, "bad class"); 2244 2245 oop r = JNIHandles::resolve(cls); 2246 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed"); 2247 if (java_lang_Class::is_primitive(r)) return false; 2248 2249 Klass* k = java_lang_Class::as_Klass(r); 2250 assert(k->is_instance_klass(), "must be an instance klass"); 2251 if (!k->is_instance_klass()) return false; 2252 2253 ResourceMark rm(THREAD); 2254 const char* name = k->name()->as_C_string(); 2255 bool system_class = k->class_loader() == NULL; 2256 return JavaAssertions::enabled(name, system_class); 2257 2258JVM_END 2259 2260 2261// Return a new AssertionStatusDirectives object with the fields filled in with 2262// command-line assertion arguments (i.e., -ea, -da). 2263JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused)) 2264 JVMWrapper("JVM_AssertionStatusDirectives"); 2265 JvmtiVMObjectAllocEventCollector oam; 2266 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL); 2267 return JNIHandles::make_local(env, asd); 2268JVM_END 2269 2270// Verification //////////////////////////////////////////////////////////////////////////////// 2271 2272// Reflection for the verifier ///////////////////////////////////////////////////////////////// 2273 2274// RedefineClasses support: bug 6214132 caused verification to fail. 2275// All functions from this section should call the jvmtiThreadSate function: 2276// Klass* class_to_verify_considering_redefinition(Klass* klass). 2277// The function returns a Klass* of the _scratch_class if the verifier 2278// was invoked in the middle of the class redefinition. 2279// Otherwise it returns its argument value which is the _the_class Klass*. 2280// Please, refer to the description in the jvmtiThreadSate.hpp. 2281 2282JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls)) 2283 JVMWrapper("JVM_GetClassNameUTF"); 2284 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2285 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2286 return k->name()->as_utf8(); 2287JVM_END 2288 2289 2290JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types)) 2291 JVMWrapper("JVM_GetClassCPTypes"); 2292 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2293 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2294 // types will have length zero if this is not an InstanceKlass 2295 // (length is determined by call to JVM_GetClassCPEntriesCount) 2296 if (k->is_instance_klass()) { 2297 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2298 for (int index = cp->length() - 1; index >= 0; index--) { 2299 constantTag tag = cp->tag_at(index); 2300 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value(); 2301 } 2302 } 2303JVM_END 2304 2305 2306JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls)) 2307 JVMWrapper("JVM_GetClassCPEntriesCount"); 2308 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2309 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2310 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length(); 2311JVM_END 2312 2313 2314JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls)) 2315 JVMWrapper("JVM_GetClassFieldsCount"); 2316 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2317 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2318 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count(); 2319JVM_END 2320 2321 2322JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls)) 2323 JVMWrapper("JVM_GetClassMethodsCount"); 2324 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2325 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2326 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length(); 2327JVM_END 2328 2329 2330// The following methods, used for the verifier, are never called with 2331// array klasses, so a direct cast to InstanceKlass is safe. 2332// Typically, these methods are called in a loop with bounds determined 2333// by the results of JVM_GetClass{Fields,Methods}Count, which return 2334// zero for arrays. 2335JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions)) 2336 JVMWrapper("JVM_GetMethodIxExceptionIndexes"); 2337 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2338 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2339 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2340 int length = method->checked_exceptions_length(); 2341 if (length > 0) { 2342 CheckedExceptionElement* table= method->checked_exceptions_start(); 2343 for (int i = 0; i < length; i++) { 2344 exceptions[i] = table[i].class_cp_index; 2345 } 2346 } 2347JVM_END 2348 2349 2350JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index)) 2351 JVMWrapper("JVM_GetMethodIxExceptionsCount"); 2352 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2353 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2354 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2355 return method->checked_exceptions_length(); 2356JVM_END 2357 2358 2359JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code)) 2360 JVMWrapper("JVM_GetMethodIxByteCode"); 2361 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2362 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2363 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2364 memcpy(code, method->code_base(), method->code_size()); 2365JVM_END 2366 2367 2368JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index)) 2369 JVMWrapper("JVM_GetMethodIxByteCodeLength"); 2370 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2371 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2372 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2373 return method->code_size(); 2374JVM_END 2375 2376 2377JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry)) 2378 JVMWrapper("JVM_GetMethodIxExceptionTableEntry"); 2379 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2380 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2381 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2382 ExceptionTable extable(method); 2383 entry->start_pc = extable.start_pc(entry_index); 2384 entry->end_pc = extable.end_pc(entry_index); 2385 entry->handler_pc = extable.handler_pc(entry_index); 2386 entry->catchType = extable.catch_type_index(entry_index); 2387JVM_END 2388 2389 2390JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index)) 2391 JVMWrapper("JVM_GetMethodIxExceptionTableLength"); 2392 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2393 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2394 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2395 return method->exception_table_length(); 2396JVM_END 2397 2398 2399JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index)) 2400 JVMWrapper("JVM_GetMethodIxModifiers"); 2401 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2402 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2403 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2404 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2405JVM_END 2406 2407 2408JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index)) 2409 JVMWrapper("JVM_GetFieldIxModifiers"); 2410 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2411 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2412 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS; 2413JVM_END 2414 2415 2416JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index)) 2417 JVMWrapper("JVM_GetMethodIxLocalsCount"); 2418 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2419 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2420 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2421 return method->max_locals(); 2422JVM_END 2423 2424 2425JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index)) 2426 JVMWrapper("JVM_GetMethodIxArgsSize"); 2427 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2428 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2429 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2430 return method->size_of_parameters(); 2431JVM_END 2432 2433 2434JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index)) 2435 JVMWrapper("JVM_GetMethodIxMaxStack"); 2436 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2437 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2438 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2439 return method->verifier_max_stack(); 2440JVM_END 2441 2442 2443JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index)) 2444 JVMWrapper("JVM_IsConstructorIx"); 2445 ResourceMark rm(THREAD); 2446 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2447 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2448 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2449 return method->name() == vmSymbols::object_initializer_name(); 2450JVM_END 2451 2452 2453JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index)) 2454 JVMWrapper("JVM_IsVMGeneratedMethodIx"); 2455 ResourceMark rm(THREAD); 2456 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2457 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2458 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2459 return method->is_overpass(); 2460JVM_END 2461 2462JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index)) 2463 JVMWrapper("JVM_GetMethodIxIxUTF"); 2464 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2465 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2466 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2467 return method->name()->as_utf8(); 2468JVM_END 2469 2470 2471JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index)) 2472 JVMWrapper("JVM_GetMethodIxSignatureUTF"); 2473 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2474 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2475 Method* method = InstanceKlass::cast(k)->methods()->at(method_index); 2476 return method->signature()->as_utf8(); 2477JVM_END 2478 2479/** 2480 * All of these JVM_GetCP-xxx methods are used by the old verifier to 2481 * read entries in the constant pool. Since the old verifier always 2482 * works on a copy of the code, it will not see any rewriting that 2483 * may possibly occur in the middle of verification. So it is important 2484 * that nothing it calls tries to use the cpCache instead of the raw 2485 * constant pool, so we must use cp->uncached_x methods when appropriate. 2486 */ 2487JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2488 JVMWrapper("JVM_GetCPFieldNameUTF"); 2489 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2490 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2491 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2492 switch (cp->tag_at(cp_index).value()) { 2493 case JVM_CONSTANT_Fieldref: 2494 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2495 default: 2496 fatal("JVM_GetCPFieldNameUTF: illegal constant"); 2497 } 2498 ShouldNotReachHere(); 2499 return NULL; 2500JVM_END 2501 2502 2503JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2504 JVMWrapper("JVM_GetCPMethodNameUTF"); 2505 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2506 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2507 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2508 switch (cp->tag_at(cp_index).value()) { 2509 case JVM_CONSTANT_InterfaceMethodref: 2510 case JVM_CONSTANT_Methodref: 2511 return cp->uncached_name_ref_at(cp_index)->as_utf8(); 2512 default: 2513 fatal("JVM_GetCPMethodNameUTF: illegal constant"); 2514 } 2515 ShouldNotReachHere(); 2516 return NULL; 2517JVM_END 2518 2519 2520JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2521 JVMWrapper("JVM_GetCPMethodSignatureUTF"); 2522 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2523 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2524 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2525 switch (cp->tag_at(cp_index).value()) { 2526 case JVM_CONSTANT_InterfaceMethodref: 2527 case JVM_CONSTANT_Methodref: 2528 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2529 default: 2530 fatal("JVM_GetCPMethodSignatureUTF: illegal constant"); 2531 } 2532 ShouldNotReachHere(); 2533 return NULL; 2534JVM_END 2535 2536 2537JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index)) 2538 JVMWrapper("JVM_GetCPFieldSignatureUTF"); 2539 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2540 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2541 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2542 switch (cp->tag_at(cp_index).value()) { 2543 case JVM_CONSTANT_Fieldref: 2544 return cp->uncached_signature_ref_at(cp_index)->as_utf8(); 2545 default: 2546 fatal("JVM_GetCPFieldSignatureUTF: illegal constant"); 2547 } 2548 ShouldNotReachHere(); 2549 return NULL; 2550JVM_END 2551 2552 2553JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2554 JVMWrapper("JVM_GetCPClassNameUTF"); 2555 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2556 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2557 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2558 Symbol* classname = cp->klass_name_at(cp_index); 2559 return classname->as_utf8(); 2560JVM_END 2561 2562 2563JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2564 JVMWrapper("JVM_GetCPFieldClassNameUTF"); 2565 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2566 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2567 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2568 switch (cp->tag_at(cp_index).value()) { 2569 case JVM_CONSTANT_Fieldref: { 2570 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2571 Symbol* classname = cp->klass_name_at(class_index); 2572 return classname->as_utf8(); 2573 } 2574 default: 2575 fatal("JVM_GetCPFieldClassNameUTF: illegal constant"); 2576 } 2577 ShouldNotReachHere(); 2578 return NULL; 2579JVM_END 2580 2581 2582JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index)) 2583 JVMWrapper("JVM_GetCPMethodClassNameUTF"); 2584 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2585 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2586 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2587 switch (cp->tag_at(cp_index).value()) { 2588 case JVM_CONSTANT_Methodref: 2589 case JVM_CONSTANT_InterfaceMethodref: { 2590 int class_index = cp->uncached_klass_ref_index_at(cp_index); 2591 Symbol* classname = cp->klass_name_at(class_index); 2592 return classname->as_utf8(); 2593 } 2594 default: 2595 fatal("JVM_GetCPMethodClassNameUTF: illegal constant"); 2596 } 2597 ShouldNotReachHere(); 2598 return NULL; 2599JVM_END 2600 2601 2602JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2603 JVMWrapper("JVM_GetCPFieldModifiers"); 2604 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2605 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2606 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2607 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2608 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2609 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants(); 2610 switch (cp->tag_at(cp_index).value()) { 2611 case JVM_CONSTANT_Fieldref: { 2612 Symbol* name = cp->uncached_name_ref_at(cp_index); 2613 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2614 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) { 2615 if (fs.name() == name && fs.signature() == signature) { 2616 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS; 2617 } 2618 } 2619 return -1; 2620 } 2621 default: 2622 fatal("JVM_GetCPFieldModifiers: illegal constant"); 2623 } 2624 ShouldNotReachHere(); 2625 return 0; 2626JVM_END 2627 2628 2629JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls)) 2630 JVMWrapper("JVM_GetCPMethodModifiers"); 2631 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 2632 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls)); 2633 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread); 2634 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread); 2635 ConstantPool* cp = InstanceKlass::cast(k)->constants(); 2636 switch (cp->tag_at(cp_index).value()) { 2637 case JVM_CONSTANT_Methodref: 2638 case JVM_CONSTANT_InterfaceMethodref: { 2639 Symbol* name = cp->uncached_name_ref_at(cp_index); 2640 Symbol* signature = cp->uncached_signature_ref_at(cp_index); 2641 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods(); 2642 int methods_count = methods->length(); 2643 for (int i = 0; i < methods_count; i++) { 2644 Method* method = methods->at(i); 2645 if (method->name() == name && method->signature() == signature) { 2646 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2647 } 2648 } 2649 return -1; 2650 } 2651 default: 2652 fatal("JVM_GetCPMethodModifiers: illegal constant"); 2653 } 2654 ShouldNotReachHere(); 2655 return 0; 2656JVM_END 2657 2658 2659// Misc ////////////////////////////////////////////////////////////////////////////////////////////// 2660 2661JVM_LEAF(void, JVM_ReleaseUTF(const char *utf)) 2662 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything 2663JVM_END 2664 2665 2666JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2)) 2667 JVMWrapper("JVM_IsSameClassPackage"); 2668 oop class1_mirror = JNIHandles::resolve_non_null(class1); 2669 oop class2_mirror = JNIHandles::resolve_non_null(class2); 2670 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror); 2671 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror); 2672 return (jboolean) Reflection::is_same_class_package(klass1, klass2); 2673JVM_END 2674 2675// Printing support ////////////////////////////////////////////////// 2676extern "C" { 2677 2678ATTRIBUTE_PRINTF(3, 0) 2679int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) { 2680 // see bug 4399518, 4417214 2681 if ((intptr_t)count <= 0) return -1; 2682 2683 int result = vsnprintf(str, count, fmt, args); 2684 // Note: on truncation vsnprintf(3) on Unix returns numbers of 2685 // characters which would have been written had the buffer been large 2686 // enough; on Windows, it returns -1. We handle both cases here and 2687 // always return -1, and perform null termination. 2688 if ((result > 0 && (size_t)result >= count) || result == -1) { 2689 str[count - 1] = '\0'; 2690 result = -1; 2691 } 2692 2693 return result; 2694} 2695 2696ATTRIBUTE_PRINTF(3, 0) 2697int jio_snprintf(char *str, size_t count, const char *fmt, ...) { 2698 va_list args; 2699 int len; 2700 va_start(args, fmt); 2701 len = jio_vsnprintf(str, count, fmt, args); 2702 va_end(args); 2703 return len; 2704} 2705 2706ATTRIBUTE_PRINTF(2,3) 2707int jio_fprintf(FILE* f, const char *fmt, ...) { 2708 int len; 2709 va_list args; 2710 va_start(args, fmt); 2711 len = jio_vfprintf(f, fmt, args); 2712 va_end(args); 2713 return len; 2714} 2715 2716ATTRIBUTE_PRINTF(2, 0) 2717int jio_vfprintf(FILE* f, const char *fmt, va_list args) { 2718 if (Arguments::vfprintf_hook() != NULL) { 2719 return Arguments::vfprintf_hook()(f, fmt, args); 2720 } else { 2721 return vfprintf(f, fmt, args); 2722 } 2723} 2724 2725ATTRIBUTE_PRINTF(1, 2) 2726JNIEXPORT int jio_printf(const char *fmt, ...) { 2727 int len; 2728 va_list args; 2729 va_start(args, fmt); 2730 len = jio_vfprintf(defaultStream::output_stream(), fmt, args); 2731 va_end(args); 2732 return len; 2733} 2734 2735 2736// HotSpot specific jio method 2737void jio_print(const char* s) { 2738 // Try to make this function as atomic as possible. 2739 if (Arguments::vfprintf_hook() != NULL) { 2740 jio_fprintf(defaultStream::output_stream(), "%s", s); 2741 } else { 2742 // Make an unused local variable to avoid warning from gcc 4.x compiler. 2743 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s)); 2744 } 2745} 2746 2747} // Extern C 2748 2749// java.lang.Thread ////////////////////////////////////////////////////////////////////////////// 2750 2751// In most of the JVM Thread support functions we need to be sure to lock the Threads_lock 2752// to prevent the target thread from exiting after we have a pointer to the C++ Thread or 2753// OSThread objects. The exception to this rule is when the target object is the thread 2754// doing the operation, in which case we know that the thread won't exit until the 2755// operation is done (all exits being voluntary). There are a few cases where it is 2756// rather silly to do operations on yourself, like resuming yourself or asking whether 2757// you are alive. While these can still happen, they are not subject to deadlocks if 2758// the lock is held while the operation occurs (this is not the case for suspend, for 2759// instance), and are very unlikely. Because IsAlive needs to be fast and its 2760// implementation is local to this file, we always lock Threads_lock for that one. 2761 2762static void thread_entry(JavaThread* thread, TRAPS) { 2763 HandleMark hm(THREAD); 2764 Handle obj(THREAD, thread->threadObj()); 2765 JavaValue result(T_VOID); 2766 JavaCalls::call_virtual(&result, 2767 obj, 2768 KlassHandle(THREAD, SystemDictionary::Thread_klass()), 2769 vmSymbols::run_method_name(), 2770 vmSymbols::void_method_signature(), 2771 THREAD); 2772} 2773 2774 2775JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread)) 2776 JVMWrapper("JVM_StartThread"); 2777 JavaThread *native_thread = NULL; 2778 2779 // We cannot hold the Threads_lock when we throw an exception, 2780 // due to rank ordering issues. Example: we might need to grab the 2781 // Heap_lock while we construct the exception. 2782 bool throw_illegal_thread_state = false; 2783 2784 // We must release the Threads_lock before we can post a jvmti event 2785 // in Thread::start. 2786 { 2787 // Ensure that the C++ Thread and OSThread structures aren't freed before 2788 // we operate. 2789 MutexLocker mu(Threads_lock); 2790 2791 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent 2792 // re-starting an already started thread, so we should usually find 2793 // that the JavaThread is null. However for a JNI attached thread 2794 // there is a small window between the Thread object being created 2795 // (with its JavaThread set) and the update to its threadStatus, so we 2796 // have to check for this 2797 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) { 2798 throw_illegal_thread_state = true; 2799 } else { 2800 // We could also check the stillborn flag to see if this thread was already stopped, but 2801 // for historical reasons we let the thread detect that itself when it starts running 2802 2803 jlong size = 2804 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread)); 2805 // Allocate the C++ Thread structure and create the native thread. The 2806 // stack size retrieved from java is signed, but the constructor takes 2807 // size_t (an unsigned type), so avoid passing negative values which would 2808 // result in really large stacks. 2809 size_t sz = size > 0 ? (size_t) size : 0; 2810 native_thread = new JavaThread(&thread_entry, sz); 2811 2812 // At this point it may be possible that no osthread was created for the 2813 // JavaThread due to lack of memory. Check for this situation and throw 2814 // an exception if necessary. Eventually we may want to change this so 2815 // that we only grab the lock if the thread was created successfully - 2816 // then we can also do this check and throw the exception in the 2817 // JavaThread constructor. 2818 if (native_thread->osthread() != NULL) { 2819 // Note: the current thread is not being used within "prepare". 2820 native_thread->prepare(jthread); 2821 } 2822 } 2823 } 2824 2825 if (throw_illegal_thread_state) { 2826 THROW(vmSymbols::java_lang_IllegalThreadStateException()); 2827 } 2828 2829 assert(native_thread != NULL, "Starting null thread?"); 2830 2831 if (native_thread->osthread() == NULL) { 2832 // No one should hold a reference to the 'native_thread'. 2833 delete native_thread; 2834 if (JvmtiExport::should_post_resource_exhausted()) { 2835 JvmtiExport::post_resource_exhausted( 2836 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS, 2837 os::native_thread_creation_failed_msg()); 2838 } 2839 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), 2840 os::native_thread_creation_failed_msg()); 2841 } 2842 2843 Thread::start(native_thread); 2844 2845JVM_END 2846 2847// JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints 2848// before the quasi-asynchronous exception is delivered. This is a little obtrusive, 2849// but is thought to be reliable and simple. In the case, where the receiver is the 2850// same thread as the sender, no safepoint is needed. 2851JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable)) 2852 JVMWrapper("JVM_StopThread"); 2853 2854 oop java_throwable = JNIHandles::resolve(throwable); 2855 if (java_throwable == NULL) { 2856 THROW(vmSymbols::java_lang_NullPointerException()); 2857 } 2858 oop java_thread = JNIHandles::resolve_non_null(jthread); 2859 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2860 Events::log_exception(JavaThread::current(), 2861 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]", 2862 p2i(receiver), p2i((address)java_thread), p2i(throwable)); 2863 // First check if thread is alive 2864 if (receiver != NULL) { 2865 // Check if exception is getting thrown at self (use oop equality, since the 2866 // target object might exit) 2867 if (java_thread == thread->threadObj()) { 2868 THROW_OOP(java_throwable); 2869 } else { 2870 // Enques a VM_Operation to stop all threads and then deliver the exception... 2871 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable)); 2872 } 2873 } 2874 else { 2875 // Either: 2876 // - target thread has not been started before being stopped, or 2877 // - target thread already terminated 2878 // We could read the threadStatus to determine which case it is 2879 // but that is overkill as it doesn't matter. We must set the 2880 // stillborn flag for the first case, and if the thread has already 2881 // exited setting this flag has no affect 2882 java_lang_Thread::set_stillborn(java_thread); 2883 } 2884JVM_END 2885 2886 2887JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread)) 2888 JVMWrapper("JVM_IsThreadAlive"); 2889 2890 oop thread_oop = JNIHandles::resolve_non_null(jthread); 2891 return java_lang_Thread::is_alive(thread_oop); 2892JVM_END 2893 2894 2895JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread)) 2896 JVMWrapper("JVM_SuspendThread"); 2897 oop java_thread = JNIHandles::resolve_non_null(jthread); 2898 JavaThread* receiver = java_lang_Thread::thread(java_thread); 2899 2900 if (receiver != NULL) { 2901 // thread has run and has not exited (still on threads list) 2902 2903 { 2904 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag); 2905 if (receiver->is_external_suspend()) { 2906 // Don't allow nested external suspend requests. We can't return 2907 // an error from this interface so just ignore the problem. 2908 return; 2909 } 2910 if (receiver->is_exiting()) { // thread is in the process of exiting 2911 return; 2912 } 2913 receiver->set_external_suspend(); 2914 } 2915 2916 // java_suspend() will catch threads in the process of exiting 2917 // and will ignore them. 2918 receiver->java_suspend(); 2919 2920 // It would be nice to have the following assertion in all the 2921 // time, but it is possible for a racing resume request to have 2922 // resumed this thread right after we suspended it. Temporarily 2923 // enable this assertion if you are chasing a different kind of 2924 // bug. 2925 // 2926 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL || 2927 // receiver->is_being_ext_suspended(), "thread is not suspended"); 2928 } 2929JVM_END 2930 2931 2932JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread)) 2933 JVMWrapper("JVM_ResumeThread"); 2934 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate. 2935 // We need to *always* get the threads lock here, since this operation cannot be allowed during 2936 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other 2937 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code 2938 // looks at it. 2939 MutexLocker ml(Threads_lock); 2940 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 2941 if (thr != NULL) { 2942 // the thread has run and is not in the process of exiting 2943 thr->java_resume(); 2944 } 2945JVM_END 2946 2947 2948JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio)) 2949 JVMWrapper("JVM_SetThreadPriority"); 2950 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 2951 MutexLocker ml(Threads_lock); 2952 oop java_thread = JNIHandles::resolve_non_null(jthread); 2953 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio); 2954 JavaThread* thr = java_lang_Thread::thread(java_thread); 2955 if (thr != NULL) { // Thread not yet started; priority pushed down when it is 2956 Thread::set_priority(thr, (ThreadPriority)prio); 2957 } 2958JVM_END 2959 2960 2961JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass)) 2962 JVMWrapper("JVM_Yield"); 2963 if (os::dont_yield()) return; 2964 HOTSPOT_THREAD_YIELD(); 2965 2966 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield. 2967 // Critical for similar threading behaviour 2968 if (ConvertYieldToSleep) { 2969 os::sleep(thread, MinSleepInterval, false); 2970 } else { 2971 os::naked_yield(); 2972 } 2973JVM_END 2974 2975 2976JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis)) 2977 JVMWrapper("JVM_Sleep"); 2978 2979 if (millis < 0) { 2980 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); 2981 } 2982 2983 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) { 2984 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 2985 } 2986 2987 // Save current thread state and restore it at the end of this block. 2988 // And set new thread state to SLEEPING. 2989 JavaThreadSleepState jtss(thread); 2990 2991 HOTSPOT_THREAD_SLEEP_BEGIN(millis); 2992 2993 EventThreadSleep event; 2994 2995 if (millis == 0) { 2996 // When ConvertSleepToYield is on, this matches the classic VM implementation of 2997 // JVM_Sleep. Critical for similar threading behaviour (Win32) 2998 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep 2999 // for SOLARIS 3000 if (ConvertSleepToYield) { 3001 os::naked_yield(); 3002 } else { 3003 ThreadState old_state = thread->osthread()->get_state(); 3004 thread->osthread()->set_state(SLEEPING); 3005 os::sleep(thread, MinSleepInterval, false); 3006 thread->osthread()->set_state(old_state); 3007 } 3008 } else { 3009 ThreadState old_state = thread->osthread()->get_state(); 3010 thread->osthread()->set_state(SLEEPING); 3011 if (os::sleep(thread, millis, true) == OS_INTRPT) { 3012 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on 3013 // us while we were sleeping. We do not overwrite those. 3014 if (!HAS_PENDING_EXCEPTION) { 3015 if (event.should_commit()) { 3016 event.set_time(millis); 3017 event.commit(); 3018 } 3019 HOTSPOT_THREAD_SLEEP_END(1); 3020 3021 // TODO-FIXME: THROW_MSG returns which means we will not call set_state() 3022 // to properly restore the thread state. That's likely wrong. 3023 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted"); 3024 } 3025 } 3026 thread->osthread()->set_state(old_state); 3027 } 3028 if (event.should_commit()) { 3029 event.set_time(millis); 3030 event.commit(); 3031 } 3032 HOTSPOT_THREAD_SLEEP_END(0); 3033JVM_END 3034 3035JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass)) 3036 JVMWrapper("JVM_CurrentThread"); 3037 oop jthread = thread->threadObj(); 3038 assert (thread != NULL, "no current thread!"); 3039 return JNIHandles::make_local(env, jthread); 3040JVM_END 3041 3042 3043JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread)) 3044 JVMWrapper("JVM_CountStackFrames"); 3045 3046 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3047 oop java_thread = JNIHandles::resolve_non_null(jthread); 3048 bool throw_illegal_thread_state = false; 3049 int count = 0; 3050 3051 { 3052 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3053 // We need to re-resolve the java_thread, since a GC might have happened during the 3054 // acquire of the lock 3055 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3056 3057 if (thr == NULL) { 3058 // do nothing 3059 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) { 3060 // Check whether this java thread has been suspended already. If not, throws 3061 // IllegalThreadStateException. We defer to throw that exception until 3062 // Threads_lock is released since loading exception class has to leave VM. 3063 // The correct way to test a thread is actually suspended is 3064 // wait_for_ext_suspend_completion(), but we can't call that while holding 3065 // the Threads_lock. The above tests are sufficient for our purposes 3066 // provided the walkability of the stack is stable - which it isn't 3067 // 100% but close enough for most practical purposes. 3068 throw_illegal_thread_state = true; 3069 } else { 3070 // Count all java activation, i.e., number of vframes 3071 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) { 3072 // Native frames are not counted 3073 if (!vfst.method()->is_native()) count++; 3074 } 3075 } 3076 } 3077 3078 if (throw_illegal_thread_state) { 3079 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(), 3080 "this thread is not suspended"); 3081 } 3082 return count; 3083JVM_END 3084 3085// Consider: A better way to implement JVM_Interrupt() is to acquire 3086// Threads_lock to resolve the jthread into a Thread pointer, fetch 3087// Thread->platformevent, Thread->native_thr, Thread->parker, etc., 3088// drop Threads_lock, and the perform the unpark() and thr_kill() operations 3089// outside the critical section. Threads_lock is hot so we want to minimize 3090// the hold-time. A cleaner interface would be to decompose interrupt into 3091// two steps. The 1st phase, performed under Threads_lock, would return 3092// a closure that'd be invoked after Threads_lock was dropped. 3093// This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and 3094// admit spurious wakeups. 3095 3096JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread)) 3097 JVMWrapper("JVM_Interrupt"); 3098 3099 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3100 oop java_thread = JNIHandles::resolve_non_null(jthread); 3101 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3102 // We need to re-resolve the java_thread, since a GC might have happened during the 3103 // acquire of the lock 3104 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3105 if (thr != NULL) { 3106 Thread::interrupt(thr); 3107 } 3108JVM_END 3109 3110 3111JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted)) 3112 JVMWrapper("JVM_IsInterrupted"); 3113 3114 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 3115 oop java_thread = JNIHandles::resolve_non_null(jthread); 3116 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock); 3117 // We need to re-resolve the java_thread, since a GC might have happened during the 3118 // acquire of the lock 3119 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)); 3120 if (thr == NULL) { 3121 return JNI_FALSE; 3122 } else { 3123 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0); 3124 } 3125JVM_END 3126 3127 3128// Return true iff the current thread has locked the object passed in 3129 3130JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj)) 3131 JVMWrapper("JVM_HoldsLock"); 3132 assert(THREAD->is_Java_thread(), "sanity check"); 3133 if (obj == NULL) { 3134 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 3135 } 3136 Handle h_obj(THREAD, JNIHandles::resolve(obj)); 3137 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj); 3138JVM_END 3139 3140 3141JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass)) 3142 JVMWrapper("JVM_DumpAllStacks"); 3143 VM_PrintThreads op; 3144 VMThread::execute(&op); 3145 if (JvmtiExport::should_post_data_dump()) { 3146 JvmtiExport::post_data_dump(); 3147 } 3148JVM_END 3149 3150JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name)) 3151 JVMWrapper("JVM_SetNativeThreadName"); 3152 ResourceMark rm(THREAD); 3153 oop java_thread = JNIHandles::resolve_non_null(jthread); 3154 JavaThread* thr = java_lang_Thread::thread(java_thread); 3155 // Thread naming only supported for the current thread, doesn't work for 3156 // target threads. 3157 if (Thread::current() == thr && !thr->has_attached_via_jni()) { 3158 // we don't set the name of an attached thread to avoid stepping 3159 // on other programs 3160 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3161 os::set_native_thread_name(thread_name); 3162 } 3163JVM_END 3164 3165// java.lang.SecurityManager /////////////////////////////////////////////////////////////////////// 3166 3167static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) { 3168 assert(jthread->is_Java_thread(), "must be a Java thread"); 3169 if (jthread->privileged_stack_top() == NULL) return false; 3170 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) { 3171 oop loader = jthread->privileged_stack_top()->class_loader(); 3172 if (loader == NULL) return true; 3173 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 3174 if (trusted) return true; 3175 } 3176 return false; 3177} 3178 3179JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env)) 3180 JVMWrapper("JVM_CurrentLoadedClass"); 3181 ResourceMark rm(THREAD); 3182 3183 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3184 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3185 bool trusted = is_trusted_frame(thread, &vfst); 3186 if (trusted) return NULL; 3187 3188 Method* m = vfst.method(); 3189 if (!m->is_native()) { 3190 InstanceKlass* holder = m->method_holder(); 3191 oop loader = holder->class_loader(); 3192 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3193 return (jclass) JNIHandles::make_local(env, holder->java_mirror()); 3194 } 3195 } 3196 } 3197 return NULL; 3198JVM_END 3199 3200 3201JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env)) 3202 JVMWrapper("JVM_CurrentClassLoader"); 3203 ResourceMark rm(THREAD); 3204 3205 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3206 3207 // if a method in a class in a trusted loader is in a doPrivileged, return NULL 3208 bool trusted = is_trusted_frame(thread, &vfst); 3209 if (trusted) return NULL; 3210 3211 Method* m = vfst.method(); 3212 if (!m->is_native()) { 3213 InstanceKlass* holder = m->method_holder(); 3214 assert(holder->is_klass(), "just checking"); 3215 oop loader = holder->class_loader(); 3216 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3217 return JNIHandles::make_local(env, loader); 3218 } 3219 } 3220 } 3221 return NULL; 3222JVM_END 3223 3224 3225JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env)) 3226 JVMWrapper("JVM_GetClassContext"); 3227 ResourceMark rm(THREAD); 3228 JvmtiVMObjectAllocEventCollector oam; 3229 vframeStream vfst(thread); 3230 3231 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) { 3232 // This must only be called from SecurityManager.getClassContext 3233 Method* m = vfst.method(); 3234 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() && 3235 m->name() == vmSymbols::getClassContext_name() && 3236 m->signature() == vmSymbols::void_class_array_signature())) { 3237 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext"); 3238 } 3239 } 3240 3241 // Collect method holders 3242 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>(); 3243 for (; !vfst.at_end(); vfst.security_next()) { 3244 Method* m = vfst.method(); 3245 // Native frames are not returned 3246 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) { 3247 Klass* holder = m->method_holder(); 3248 assert(holder->is_klass(), "just checking"); 3249 klass_array->append(holder); 3250 } 3251 } 3252 3253 // Create result array of type [Ljava/lang/Class; 3254 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL); 3255 // Fill in mirrors corresponding to method holders 3256 for (int i = 0; i < klass_array->length(); i++) { 3257 result->obj_at_put(i, klass_array->at(i)->java_mirror()); 3258 } 3259 3260 return (jobjectArray) JNIHandles::make_local(env, result); 3261JVM_END 3262 3263 3264JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name)) 3265 JVMWrapper("JVM_ClassDepth"); 3266 ResourceMark rm(THREAD); 3267 Handle h_name (THREAD, JNIHandles::resolve_non_null(name)); 3268 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0); 3269 3270 const char* str = java_lang_String::as_utf8_string(class_name_str()); 3271 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str)); 3272 if (class_name_sym == NULL) { 3273 return -1; 3274 } 3275 3276 int depth = 0; 3277 3278 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3279 if (!vfst.method()->is_native()) { 3280 InstanceKlass* holder = vfst.method()->method_holder(); 3281 assert(holder->is_klass(), "just checking"); 3282 if (holder->name() == class_name_sym) { 3283 return depth; 3284 } 3285 depth++; 3286 } 3287 } 3288 return -1; 3289JVM_END 3290 3291 3292JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env)) 3293 JVMWrapper("JVM_ClassLoaderDepth"); 3294 ResourceMark rm(THREAD); 3295 int depth = 0; 3296 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3297 // if a method in a class in a trusted loader is in a doPrivileged, return -1 3298 bool trusted = is_trusted_frame(thread, &vfst); 3299 if (trusted) return -1; 3300 3301 Method* m = vfst.method(); 3302 if (!m->is_native()) { 3303 InstanceKlass* holder = m->method_holder(); 3304 assert(holder->is_klass(), "just checking"); 3305 oop loader = holder->class_loader(); 3306 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) { 3307 return depth; 3308 } 3309 depth++; 3310 } 3311 } 3312 return -1; 3313JVM_END 3314 3315 3316// java.lang.Package //////////////////////////////////////////////////////////////// 3317 3318 3319JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name)) 3320 JVMWrapper("JVM_GetSystemPackage"); 3321 ResourceMark rm(THREAD); 3322 JvmtiVMObjectAllocEventCollector oam; 3323 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 3324 oop result = ClassLoader::get_system_package(str, CHECK_NULL); 3325 return (jstring) JNIHandles::make_local(result); 3326JVM_END 3327 3328 3329JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env)) 3330 JVMWrapper("JVM_GetSystemPackages"); 3331 JvmtiVMObjectAllocEventCollector oam; 3332 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL); 3333 return (jobjectArray) JNIHandles::make_local(result); 3334JVM_END 3335 3336 3337// java.lang.ref.Reference /////////////////////////////////////////////////////////////// 3338 3339 3340JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env)) 3341 JVMWrapper("JVM_GetAndClearReferencePendingList"); 3342 3343 MonitorLockerEx ml(Heap_lock); 3344 oop ref = Universe::reference_pending_list(); 3345 if (ref != NULL) { 3346 Universe::set_reference_pending_list(NULL); 3347 } 3348 return JNIHandles::make_local(env, ref); 3349JVM_END 3350 3351JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env)) 3352 JVMWrapper("JVM_HasReferencePendingList"); 3353 MonitorLockerEx ml(Heap_lock); 3354 return Universe::has_reference_pending_list(); 3355JVM_END 3356 3357JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env)) 3358 JVMWrapper("JVM_WaitForReferencePendingList"); 3359 MonitorLockerEx ml(Heap_lock); 3360 while (!Universe::has_reference_pending_list()) { 3361 ml.wait(); 3362 } 3363JVM_END 3364 3365 3366// ObjectInputStream /////////////////////////////////////////////////////////////// 3367 3368bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) { 3369 if (current_class == NULL) { 3370 return true; 3371 } 3372 if ((current_class == field_class) || access.is_public()) { 3373 return true; 3374 } 3375 3376 if (access.is_protected()) { 3377 // See if current_class is a subclass of field_class 3378 if (current_class->is_subclass_of(field_class)) { 3379 return true; 3380 } 3381 } 3382 3383 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class)); 3384} 3385 3386// Return the first user-defined class loader up the execution stack, or null 3387// if only code from the bootstrap or platform class loader is on the stack. 3388 3389JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env)) 3390 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) { 3391 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection 3392 oop loader = vfst.method()->method_holder()->class_loader(); 3393 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) { 3394 return JNIHandles::make_local(env, loader); 3395 } 3396 } 3397 return NULL; 3398JVM_END 3399 3400 3401// Array /////////////////////////////////////////////////////////////////////////////////////////// 3402 3403 3404// resolve array handle and check arguments 3405static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) { 3406 if (arr == NULL) { 3407 THROW_0(vmSymbols::java_lang_NullPointerException()); 3408 } 3409 oop a = JNIHandles::resolve_non_null(arr); 3410 if (!a->is_array()) { 3411 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array"); 3412 } else if (type_array_only && !a->is_typeArray()) { 3413 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type"); 3414 } 3415 return arrayOop(a); 3416} 3417 3418 3419JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr)) 3420 JVMWrapper("JVM_GetArrayLength"); 3421 arrayOop a = check_array(env, arr, false, CHECK_0); 3422 return a->length(); 3423JVM_END 3424 3425 3426JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index)) 3427 JVMWrapper("JVM_Array_Get"); 3428 JvmtiVMObjectAllocEventCollector oam; 3429 arrayOop a = check_array(env, arr, false, CHECK_NULL); 3430 jvalue value; 3431 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL); 3432 oop box = Reflection::box(&value, type, CHECK_NULL); 3433 return JNIHandles::make_local(env, box); 3434JVM_END 3435 3436 3437JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode)) 3438 JVMWrapper("JVM_GetPrimitiveArrayElement"); 3439 jvalue value; 3440 value.i = 0; // to initialize value before getting used in CHECK 3441 arrayOop a = check_array(env, arr, true, CHECK_(value)); 3442 assert(a->is_typeArray(), "just checking"); 3443 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value)); 3444 BasicType wide_type = (BasicType) wCode; 3445 if (type != wide_type) { 3446 Reflection::widen(&value, type, wide_type, CHECK_(value)); 3447 } 3448 return value; 3449JVM_END 3450 3451 3452JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val)) 3453 JVMWrapper("JVM_SetArrayElement"); 3454 arrayOop a = check_array(env, arr, false, CHECK); 3455 oop box = JNIHandles::resolve(val); 3456 jvalue value; 3457 value.i = 0; // to initialize value before getting used in CHECK 3458 BasicType value_type; 3459 if (a->is_objArray()) { 3460 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array 3461 value_type = Reflection::unbox_for_regular_object(box, &value); 3462 } else { 3463 value_type = Reflection::unbox_for_primitive(box, &value, CHECK); 3464 } 3465 Reflection::array_set(&value, a, index, value_type, CHECK); 3466JVM_END 3467 3468 3469JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode)) 3470 JVMWrapper("JVM_SetPrimitiveArrayElement"); 3471 arrayOop a = check_array(env, arr, true, CHECK); 3472 assert(a->is_typeArray(), "just checking"); 3473 BasicType value_type = (BasicType) vCode; 3474 Reflection::array_set(&v, a, index, value_type, CHECK); 3475JVM_END 3476 3477 3478JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length)) 3479 JVMWrapper("JVM_NewArray"); 3480 JvmtiVMObjectAllocEventCollector oam; 3481 oop element_mirror = JNIHandles::resolve(eltClass); 3482 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL); 3483 return JNIHandles::make_local(env, result); 3484JVM_END 3485 3486 3487JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim)) 3488 JVMWrapper("JVM_NewMultiArray"); 3489 JvmtiVMObjectAllocEventCollector oam; 3490 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL); 3491 oop element_mirror = JNIHandles::resolve(eltClass); 3492 assert(dim_array->is_typeArray(), "just checking"); 3493 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL); 3494 return JNIHandles::make_local(env, result); 3495JVM_END 3496 3497 3498// Library support /////////////////////////////////////////////////////////////////////////// 3499 3500JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name)) 3501 //%note jvm_ct 3502 JVMWrapper("JVM_LoadLibrary"); 3503 char ebuf[1024]; 3504 void *load_result; 3505 { 3506 ThreadToNativeFromVM ttnfvm(thread); 3507 load_result = os::dll_load(name, ebuf, sizeof ebuf); 3508 } 3509 if (load_result == NULL) { 3510 char msg[1024]; 3511 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf); 3512 // Since 'ebuf' may contain a string encoded using 3513 // platform encoding scheme, we need to pass 3514 // Exceptions::unsafe_to_utf8 to the new_exception method 3515 // as the last argument. See bug 6367357. 3516 Handle h_exception = 3517 Exceptions::new_exception(thread, 3518 vmSymbols::java_lang_UnsatisfiedLinkError(), 3519 msg, Exceptions::unsafe_to_utf8); 3520 3521 THROW_HANDLE_0(h_exception); 3522 } 3523 return load_result; 3524JVM_END 3525 3526 3527JVM_LEAF(void, JVM_UnloadLibrary(void* handle)) 3528 JVMWrapper("JVM_UnloadLibrary"); 3529 os::dll_unload(handle); 3530JVM_END 3531 3532 3533JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name)) 3534 JVMWrapper("JVM_FindLibraryEntry"); 3535 return os::dll_lookup(handle, name); 3536JVM_END 3537 3538 3539// JNI version /////////////////////////////////////////////////////////////////////////////// 3540 3541JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version)) 3542 JVMWrapper("JVM_IsSupportedJNIVersion"); 3543 return Threads::is_supported_jni_version_including_1_1(version); 3544JVM_END 3545 3546 3547// String support /////////////////////////////////////////////////////////////////////////// 3548 3549JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str)) 3550 JVMWrapper("JVM_InternString"); 3551 JvmtiVMObjectAllocEventCollector oam; 3552 if (str == NULL) return NULL; 3553 oop string = JNIHandles::resolve_non_null(str); 3554 oop result = StringTable::intern(string, CHECK_NULL); 3555 return (jstring) JNIHandles::make_local(env, result); 3556JVM_END 3557 3558 3559// Raw monitor support ////////////////////////////////////////////////////////////////////// 3560 3561// The lock routine below calls lock_without_safepoint_check in order to get a raw lock 3562// without interfering with the safepoint mechanism. The routines are not JVM_LEAF because 3563// they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check 3564// that only works with java threads. 3565 3566 3567JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) { 3568 VM_Exit::block_if_vm_exited(); 3569 JVMWrapper("JVM_RawMonitorCreate"); 3570 return new Mutex(Mutex::native, "JVM_RawMonitorCreate"); 3571} 3572 3573 3574JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) { 3575 VM_Exit::block_if_vm_exited(); 3576 JVMWrapper("JVM_RawMonitorDestroy"); 3577 delete ((Mutex*) mon); 3578} 3579 3580 3581JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) { 3582 VM_Exit::block_if_vm_exited(); 3583 JVMWrapper("JVM_RawMonitorEnter"); 3584 ((Mutex*) mon)->jvm_raw_lock(); 3585 return 0; 3586} 3587 3588 3589JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) { 3590 VM_Exit::block_if_vm_exited(); 3591 JVMWrapper("JVM_RawMonitorExit"); 3592 ((Mutex*) mon)->jvm_raw_unlock(); 3593} 3594 3595 3596// Shared JNI/JVM entry points ////////////////////////////////////////////////////////////// 3597 3598jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, 3599 Handle loader, Handle protection_domain, 3600 jboolean throwError, TRAPS) { 3601 // Security Note: 3602 // The Java level wrapper will perform the necessary security check allowing 3603 // us to pass the NULL as the initiating class loader. The VM is responsible for 3604 // the checkPackageAccess relative to the initiating class loader via the 3605 // protection_domain. The protection_domain is passed as NULL by the java code 3606 // if there is no security manager in 3-arg Class.forName(). 3607 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL); 3608 3609 KlassHandle klass_handle(THREAD, klass); 3610 // Check if we should initialize the class 3611 if (init && klass_handle->is_instance_klass()) { 3612 klass_handle->initialize(CHECK_NULL); 3613 } 3614 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror()); 3615} 3616 3617 3618// Method /////////////////////////////////////////////////////////////////////////////////////////// 3619 3620JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0)) 3621 JVMWrapper("JVM_InvokeMethod"); 3622 Handle method_handle; 3623 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) { 3624 method_handle = Handle(THREAD, JNIHandles::resolve(method)); 3625 Handle receiver(THREAD, JNIHandles::resolve(obj)); 3626 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3627 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL); 3628 jobject res = JNIHandles::make_local(env, result); 3629 if (JvmtiExport::should_post_vm_object_alloc()) { 3630 oop ret_type = java_lang_reflect_Method::return_type(method_handle()); 3631 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!"); 3632 if (java_lang_Class::is_primitive(ret_type)) { 3633 // Only for primitive type vm allocates memory for java object. 3634 // See box() method. 3635 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3636 } 3637 } 3638 return res; 3639 } else { 3640 THROW_0(vmSymbols::java_lang_StackOverflowError()); 3641 } 3642JVM_END 3643 3644 3645JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0)) 3646 JVMWrapper("JVM_NewInstanceFromConstructor"); 3647 oop constructor_mirror = JNIHandles::resolve(c); 3648 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0))); 3649 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL); 3650 jobject res = JNIHandles::make_local(env, result); 3651 if (JvmtiExport::should_post_vm_object_alloc()) { 3652 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result); 3653 } 3654 return res; 3655JVM_END 3656 3657// Atomic /////////////////////////////////////////////////////////////////////////////////////////// 3658 3659JVM_LEAF(jboolean, JVM_SupportsCX8()) 3660 JVMWrapper("JVM_SupportsCX8"); 3661 return VM_Version::supports_cx8(); 3662JVM_END 3663 3664// Returns an array of all live Thread objects (VM internal JavaThreads, 3665// jvmti agent threads, and JNI attaching threads are skipped) 3666// See CR 6404306 regarding JNI attaching threads 3667JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy)) 3668 ResourceMark rm(THREAD); 3669 ThreadsListEnumerator tle(THREAD, false, false); 3670 JvmtiVMObjectAllocEventCollector oam; 3671 3672 int num_threads = tle.num_threads(); 3673 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL); 3674 objArrayHandle threads_ah(THREAD, r); 3675 3676 for (int i = 0; i < num_threads; i++) { 3677 Handle h = tle.get_threadObj(i); 3678 threads_ah->obj_at_put(i, h()); 3679 } 3680 3681 return (jobjectArray) JNIHandles::make_local(env, threads_ah()); 3682JVM_END 3683 3684 3685// Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods 3686// Return StackTraceElement[][], each element is the stack trace of a thread in 3687// the corresponding entry in the given threads array 3688JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads)) 3689 JVMWrapper("JVM_DumpThreads"); 3690 JvmtiVMObjectAllocEventCollector oam; 3691 3692 // Check if threads is null 3693 if (threads == NULL) { 3694 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 3695 } 3696 3697 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads)); 3698 objArrayHandle ah(THREAD, a); 3699 int num_threads = ah->length(); 3700 // check if threads is non-empty array 3701 if (num_threads == 0) { 3702 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3703 } 3704 3705 // check if threads is not an array of objects of Thread class 3706 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass(); 3707 if (k != SystemDictionary::Thread_klass()) { 3708 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0); 3709 } 3710 3711 ResourceMark rm(THREAD); 3712 3713 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 3714 for (int i = 0; i < num_threads; i++) { 3715 oop thread_obj = ah->obj_at(i); 3716 instanceHandle h(THREAD, (instanceOop) thread_obj); 3717 thread_handle_array->append(h); 3718 } 3719 3720 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL); 3721 return (jobjectArray)JNIHandles::make_local(env, stacktraces()); 3722 3723JVM_END 3724 3725// JVM monitoring and management support 3726JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version)) 3727 return Management::get_jmm_interface(version); 3728JVM_END 3729 3730// com.sun.tools.attach.VirtualMachine agent properties support 3731// 3732// Initialize the agent properties with the properties maintained in the VM 3733JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties)) 3734 JVMWrapper("JVM_InitAgentProperties"); 3735 ResourceMark rm; 3736 3737 Handle props(THREAD, JNIHandles::resolve_non_null(properties)); 3738 3739 PUTPROP(props, "sun.java.command", Arguments::java_command()); 3740 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags()); 3741 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args()); 3742 return properties; 3743JVM_END 3744 3745JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass)) 3746{ 3747 JVMWrapper("JVM_GetEnclosingMethodInfo"); 3748 JvmtiVMObjectAllocEventCollector oam; 3749 3750 if (ofClass == NULL) { 3751 return NULL; 3752 } 3753 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass)); 3754 // Special handling for primitive objects 3755 if (java_lang_Class::is_primitive(mirror())) { 3756 return NULL; 3757 } 3758 Klass* k = java_lang_Class::as_Klass(mirror()); 3759 if (!k->is_instance_klass()) { 3760 return NULL; 3761 } 3762 instanceKlassHandle ik_h(THREAD, k); 3763 int encl_method_class_idx = ik_h->enclosing_method_class_index(); 3764 if (encl_method_class_idx == 0) { 3765 return NULL; 3766 } 3767 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL); 3768 objArrayHandle dest(THREAD, dest_o); 3769 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL); 3770 dest->obj_at_put(0, enc_k->java_mirror()); 3771 int encl_method_method_idx = ik_h->enclosing_method_method_index(); 3772 if (encl_method_method_idx != 0) { 3773 Symbol* sym = ik_h->constants()->symbol_at( 3774 extract_low_short_from_int( 3775 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3776 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3777 dest->obj_at_put(1, str()); 3778 sym = ik_h->constants()->symbol_at( 3779 extract_high_short_from_int( 3780 ik_h->constants()->name_and_type_at(encl_method_method_idx))); 3781 str = java_lang_String::create_from_symbol(sym, CHECK_NULL); 3782 dest->obj_at_put(2, str()); 3783 } 3784 return (jobjectArray) JNIHandles::make_local(dest()); 3785} 3786JVM_END 3787 3788JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size)) 3789{ 3790 memset(info, 0, info_size); 3791 3792 info->jvm_version = Abstract_VM_Version::jvm_version(); 3793 info->patch_version = Abstract_VM_Version::vm_patch_version(); 3794 3795 // when we add a new capability in the jvm_version_info struct, we should also 3796 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat 3797 // counter defined in runtimeService.cpp. 3798 info->is_attachable = AttachListener::is_attach_supported(); 3799} 3800JVM_END 3801 3802// Returns an array of java.lang.String objects containing the input arguments to the VM. 3803JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env)) 3804 ResourceMark rm(THREAD); 3805 3806 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 3807 return NULL; 3808 } 3809 3810 char** vm_flags = Arguments::jvm_flags_array(); 3811 char** vm_args = Arguments::jvm_args_array(); 3812 int num_flags = Arguments::num_jvm_flags(); 3813 int num_args = Arguments::num_jvm_args(); 3814 3815 instanceKlassHandle ik (THREAD, SystemDictionary::String_klass()); 3816 objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL); 3817 objArrayHandle result_h(THREAD, r); 3818 3819 int index = 0; 3820 for (int j = 0; j < num_flags; j++, index++) { 3821 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 3822 result_h->obj_at_put(index, h()); 3823 } 3824 for (int i = 0; i < num_args; i++, index++) { 3825 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 3826 result_h->obj_at_put(index, h()); 3827 } 3828 return (jobjectArray) JNIHandles::make_local(env, result_h()); 3829JVM_END 3830 3831JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 3832 return os::get_signal_number(name); 3833JVM_END 3834